Upgrade V8 to 3.8.6

153 files changed, 2689 insertions, 1571 deletions

diff --git a/deps/v8/src/api.cc b/deps/v8/src/api.cc
index 3bd5a3180..bac306930 100644
--- a/deps/v8/src/api.cc
+++ b/deps/v8/src/api.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -2165,6 +2165,11 @@ bool Value::IsInt32() const {
   if (obj->IsSmi()) return true;
   if (obj->IsNumber()) {
     double value = obj->Number();
+    static const i::DoubleRepresentation minus_zero(-0.0);
+    i::DoubleRepresentation rep(value);
+    if (rep.bits == minus_zero.bits) {
+      return false;
+    }
     return i::FastI2D(i::FastD2I(value)) == value;
   }
   return false;
@@ -2177,6 +2182,11 @@ bool Value::IsUint32() const {
   if (obj->IsSmi()) return i::Smi::cast(*obj)->value() >= 0;
   if (obj->IsNumber()) {
     double value = obj->Number();
+    static const i::DoubleRepresentation minus_zero(-0.0);
+    i::DoubleRepresentation rep(value);
+    if (rep.bits == minus_zero.bits) {
+      return false;
+    }
     return i::FastUI2D(i::FastD2UI(value)) == value;
   }
   return false;
@@ -2739,7 +2749,7 @@ bool v8::Object::Set(uint32_t index, v8::Handle<Value> value) {
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
   EXCEPTION_PREAMBLE(isolate);
-  i::Handle<i::Object> obj = i::SetElement(
+  i::Handle<i::Object> obj = i::JSObject::SetElement(
       self,
       index,
       value_obj,
@@ -2845,7 +2855,7 @@ Local<Value> v8::Object::GetPrototype() {
              return Local<v8::Value>());
   ENTER_V8(isolate);
   i::Handle<i::Object> self = Utils::OpenHandle(this);
-  i::Handle<i::Object> result = i::GetPrototype(self);
+  i::Handle<i::Object> result(self->GetPrototype());
   return Utils::ToLocal(result);
 }
 
@@ -2999,7 +3009,7 @@ bool v8::Object::Delete(v8::Handle<String> key) {
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
-  return i::DeleteProperty(self, key_obj)->IsTrue();
+  return i::JSObject::DeleteProperty(self, key_obj)->IsTrue();
 }
 
 
@@ -3020,7 +3030,7 @@ bool v8::Object::Delete(uint32_t index) {
   ENTER_V8(isolate);
   HandleScope scope;
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
-  return i::DeleteElement(self, index)->IsTrue();
+  return i::JSObject::DeleteElement(self, index)->IsTrue();
 }
 
 
@@ -3225,7 +3235,7 @@ int v8::Object::GetIdentityHash() {
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
-  return i::GetIdentityHash(self);
+  return i::JSObject::GetIdentityHash(self);
 }
 
 
@@ -3238,7 +3248,8 @@ bool v8::Object::SetHiddenValue(v8::Handle<v8::String> key,
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
-  i::Handle<i::Object> result = i::SetHiddenProperty(self, key_obj, value_obj);
+  i::Handle<i::Object> result =
+      i::JSObject::SetHiddenProperty(self, key_obj, value_obj);
   return *result == *self;
 }
 
@@ -4038,6 +4049,13 @@ void v8::V8::GetHeapStatistics(HeapStatistics* heap_statistics) {
 }
 
 
+void v8::V8::VisitExternalResources(ExternalResourceVisitor* visitor) {
+  i::Isolate* isolate = i::Isolate::Current();
+  IsDeadCheck(isolate, "v8::V8::VisitExternalResources");
+  isolate->heap()->VisitExternalResources(visitor);
+}
+
+
 bool v8::V8::IdleNotification(int hint) {
   // Returning true tells the caller that it need not
   // continue to call IdleNotification.
@@ -5542,7 +5560,7 @@ void Debug::DisableAgent() {
 
 
 void Debug::ProcessDebugMessages() {
-  i::Execution::ProcessDebugMesssages(true);
+  i::Execution::ProcessDebugMessages(true);
 }
 
 Local<Context> Debug::GetDebugContext() {
diff --git a/deps/v8/src/arm/assembler-arm-inl.h b/deps/v8/src/arm/assembler-arm-inl.h
index 79f9c7bd2..2ec6c7cfa 100644
--- a/deps/v8/src/arm/assembler-arm-inl.h
+++ b/deps/v8/src/arm/assembler-arm-inl.h
@@ -32,7 +32,7 @@
 
 // The original source code covered by the above license above has been modified
 // significantly by Google Inc.
-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 
 #ifndef V8_ARM_ASSEMBLER_ARM_INL_H_
 #define V8_ARM_ASSEMBLER_ARM_INL_H_
@@ -46,6 +46,13 @@ namespace v8 {
 namespace internal {
 
 
+int DwVfpRegister::ToAllocationIndex(DwVfpRegister reg) {
+  ASSERT(!reg.is(kDoubleRegZero));
+  ASSERT(!reg.is(kScratchDoubleReg));
+  return reg.code();
+}
+
+
 void RelocInfo::apply(intptr_t delta) {
   if (RelocInfo::IsInternalReference(rmode_)) {
     // absolute code pointer inside code object moves with the code object.
diff --git a/deps/v8/src/arm/assembler-arm.cc b/deps/v8/src/arm/assembler-arm.cc
index 329493a34..25922361a 100644
--- a/deps/v8/src/arm/assembler-arm.cc
+++ b/deps/v8/src/arm/assembler-arm.cc
@@ -317,7 +317,7 @@ Assembler::Assembler(Isolate* arg_isolate, void* buffer, int buffer_size)
     own_buffer_ = false;
   }
 
-  // Setup buffer pointers.
+  // Set up buffer pointers.
   ASSERT(buffer_ != NULL);
   pc_ = buffer_;
   reloc_info_writer.Reposition(buffer_ + buffer_size, pc_);
@@ -349,7 +349,7 @@ void Assembler::GetCode(CodeDesc* desc) {
   CheckConstPool(true, false);
   ASSERT(num_pending_reloc_info_ == 0);
 
-  // Setup code descriptor.
+  // Set up code descriptor.
   desc->buffer = buffer_;
   desc->buffer_size = buffer_size_;
   desc->instr_size = pc_offset();
@@ -2446,7 +2446,7 @@ void Assembler::GrowBuffer() {
   }
   CHECK_GT(desc.buffer_size, 0);  // no overflow
 
-  // Setup new buffer.
+  // Set up new buffer.
   desc.buffer = NewArray<byte>(desc.buffer_size);
 
   desc.instr_size = pc_offset();
diff --git a/deps/v8/src/arm/assembler-arm.h b/deps/v8/src/arm/assembler-arm.h
index 247479d73..e88739e49 100644
--- a/deps/v8/src/arm/assembler-arm.h
+++ b/deps/v8/src/arm/assembler-arm.h
@@ -32,7 +32,7 @@
 
 // The original source code covered by the above license above has been
 // modified significantly by Google Inc.
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 
 // A light-weight ARM Assembler
 // Generates user mode instructions for the ARM architecture up to version 5
@@ -176,14 +176,11 @@ struct DwVfpRegister {
   static const int kNumAllocatableRegisters = kNumRegisters -
       kNumReservedRegisters;
 
-  static int ToAllocationIndex(DwVfpRegister reg) {
-    ASSERT(reg.code() != 0);
-    return reg.code() - 1;
-  }
+  inline static int ToAllocationIndex(DwVfpRegister reg);
 
   static DwVfpRegister FromAllocationIndex(int index) {
     ASSERT(index >= 0 && index < kNumAllocatableRegisters);
-    return from_code(index + 1);
+    return from_code(index);
   }
 
   static const char* AllocationIndexToString(int index) {
@@ -307,6 +304,7 @@ const DwVfpRegister d15 = { 15 };
 static const DwVfpRegister& kFirstCalleeSavedDoubleReg = d8;
 static const DwVfpRegister& kLastCalleeSavedDoubleReg = d15;
 static const DwVfpRegister& kDoubleRegZero = d14;
+static const DwVfpRegister& kScratchDoubleReg = d15;
 
 
 // Coprocessor register
diff --git a/deps/v8/src/arm/builtins-arm.cc b/deps/v8/src/arm/builtins-arm.cc
index 69ef1872c..2a650a44a 100644
--- a/deps/v8/src/arm/builtins-arm.cc
+++ b/deps/v8/src/arm/builtins-arm.cc
@@ -333,7 +333,7 @@ static void ArrayNativeCode(MacroAssembler* masm,
                        r5,
                        call_generic_code);
   __ IncrementCounter(counters->array_function_native(), 1, r3, r4);
-  // Setup return value, remove receiver from stack and return.
+  // Set up return value, remove receiver from stack and return.
   __ mov(r0, r2);
   __ add(sp, sp, Operand(kPointerSize));
   __ Jump(lr);
@@ -376,7 +376,7 @@ static void ArrayNativeCode(MacroAssembler* masm,
                   true,
                   call_generic_code);
   __ IncrementCounter(counters->array_function_native(), 1, r2, r4);
-  // Setup return value, remove receiver and argument from stack and return.
+  // Set up return value, remove receiver and argument from stack and return.
   __ mov(r0, r3);
   __ add(sp, sp, Operand(2 * kPointerSize));
   __ Jump(lr);
@@ -951,10 +951,10 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // sp[4]: number of arguments (smi-tagged)
     __ ldr(r3, MemOperand(sp, 4 * kPointerSize));
 
-    // Setup pointer to last argument.
+    // Set up pointer to last argument.
     __ add(r2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
 
-    // Setup number of arguments for function call below
+    // Set up number of arguments for function call below
     __ mov(r0, Operand(r3, LSR, kSmiTagSize));
 
     // Copy arguments and receiver to the expression stack.
@@ -1082,10 +1082,7 @@ static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
     // Set up the context from the function argument.
     __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
 
-    // Set up the roots register.
-    ExternalReference roots_array_start =
-        ExternalReference::roots_array_start(masm->isolate());
-    __ mov(r10, Operand(roots_array_start));
+    __ InitializeRootRegister();
 
     // Push the function and the receiver onto the stack.
     __ push(r1);
diff --git a/deps/v8/src/arm/code-stubs-arm.cc b/deps/v8/src/arm/code-stubs-arm.cc
index e95e2cf42..15ef9bcf9 100644
--- a/deps/v8/src/arm/code-stubs-arm.cc
+++ b/deps/v8/src/arm/code-stubs-arm.cc
@@ -156,13 +156,13 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
   // Load the function from the stack.
   __ ldr(r3, MemOperand(sp, 0));
 
-  // Setup the object header.
+  // Set up the object header.
   __ LoadRoot(r2, Heap::kFunctionContextMapRootIndex);
   __ str(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
   __ mov(r2, Operand(Smi::FromInt(length)));
   __ str(r2, FieldMemOperand(r0, FixedArray::kLengthOffset));
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ mov(r1, Operand(Smi::FromInt(0)));
   __ str(r3, MemOperand(r0, Context::SlotOffset(Context::CLOSURE_INDEX)));
   __ str(cp, MemOperand(r0, Context::SlotOffset(Context::PREVIOUS_INDEX)));
@@ -207,7 +207,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   // Load the serialized scope info from the stack.
   __ ldr(r1, MemOperand(sp, 1 * kPointerSize));
 
-  // Setup the object header.
+  // Set up the object header.
   __ LoadRoot(r2, Heap::kBlockContextMapRootIndex);
   __ str(r2, FieldMemOperand(r0, HeapObject::kMapOffset));
   __ mov(r2, Operand(Smi::FromInt(length)));
@@ -229,7 +229,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   __ ldr(r3, ContextOperand(r3, Context::CLOSURE_INDEX));
   __ bind(&after_sentinel);
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ str(r3, ContextOperand(r0, Context::CLOSURE_INDEX));
   __ str(cp, ContextOperand(r0, Context::PREVIOUS_INDEX));
   __ str(r1, ContextOperand(r0, Context::EXTENSION_INDEX));
@@ -717,7 +717,7 @@ void FloatingPointHelper::ConvertIntToDouble(MacroAssembler* masm,
     // Get the absolute value of the object (as an unsigned integer).
     __ rsb(int_scratch, int_scratch, Operand::Zero(), SetCC, mi);
 
-    // Get mantisssa[51:20].
+    // Get mantissa[51:20].
 
     // Get the position of the first set bit.
     __ CountLeadingZeros(dst1, int_scratch, scratch2);
@@ -951,7 +951,7 @@ void FloatingPointHelper::DoubleIs32BitInteger(MacroAssembler* masm,
   // non zero bits left. So we need the (30 - exponent) last bits of the
   // 31 higher bits of the mantissa to be null.
   // Because bits [21:0] are null, we can check instead that the
-  // (32 - exponent) last bits of the 32 higher bits of the mantisssa are null.
+  // (32 - exponent) last bits of the 32 higher bits of the mantissa are null.
 
   // Get the 32 higher bits of the mantissa in dst.
   __ Ubfx(dst,
@@ -3842,7 +3842,7 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   FrameScope scope(masm, StackFrame::MANUAL);
   __ EnterExitFrame(save_doubles_);
 
-  // Setup argc and the builtin function in callee-saved registers.
+  // Set up argc and the builtin function in callee-saved registers.
   __ mov(r4, Operand(r0));
   __ mov(r5, Operand(r1));
 
@@ -3919,7 +3919,7 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   // r2: receiver
   // r3: argc
 
-  // Setup argv in r4.
+  // Set up argv in r4.
   int offset_to_argv = (kNumCalleeSaved + 1) * kPointerSize;
   if (CpuFeatures::IsSupported(VFP3)) {
     offset_to_argv += kNumDoubleCalleeSaved * kDoubleSize;
@@ -3942,7 +3942,7 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   __ ldr(r5, MemOperand(r5));
   __ Push(r8, r7, r6, r5);
 
-  // Setup frame pointer for the frame to be pushed.
+  // Set up frame pointer for the frame to be pushed.
   __ add(fp, sp, Operand(-EntryFrameConstants::kCallerFPOffset));
 
   // If this is the outermost JS call, set js_entry_sp value.
@@ -4081,7 +4081,7 @@ void InstanceofStub::Generate(MacroAssembler* masm) {
   const Register inline_site = r9;
   const Register scratch = r2;
 
-  const int32_t kDeltaToLoadBoolResult = 3 * kPointerSize;
+  const int32_t kDeltaToLoadBoolResult = 4 * kPointerSize;
 
   Label slow, loop, is_instance, is_not_instance, not_js_object;
 
@@ -4132,7 +4132,8 @@ void InstanceofStub::Generate(MacroAssembler* masm) {
     __ sub(inline_site, lr, scratch);
     // Get the map location in scratch and patch it.
     __ GetRelocatedValueLocation(inline_site, scratch);
-    __ str(map, MemOperand(scratch));
+    __ ldr(scratch, MemOperand(scratch));
+    __ str(map, FieldMemOperand(scratch, JSGlobalPropertyCell::kValueOffset));
   }
 
   // Register mapping: r3 is object map and r4 is function prototype.
@@ -4401,7 +4402,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
     __ str(r3, FieldMemOperand(r0, i));
   }
 
-  // Setup the callee in-object property.
+  // Set up the callee in-object property.
   STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
   __ ldr(r3, MemOperand(sp, 2 * kPointerSize));
   const int kCalleeOffset = JSObject::kHeaderSize +
@@ -4414,7 +4415,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
       Heap::kArgumentsLengthIndex * kPointerSize;
   __ str(r2, FieldMemOperand(r0, kLengthOffset));
 
-  // Setup the elements pointer in the allocated arguments object.
+  // Set up the elements pointer in the allocated arguments object.
   // If we allocated a parameter map, r4 will point there, otherwise
   // it will point to the backing store.
   __ add(r4, r0, Operand(Heap::kArgumentsObjectSize));
@@ -4509,7 +4510,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
   __ Ret();
 
   // Do the runtime call to allocate the arguments object.
-  // r2 = argument count (taggged)
+  // r2 = argument count (tagged)
   __ bind(&runtime);
   __ str(r2, MemOperand(sp, 0 * kPointerSize));  // Patch argument count.
   __ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
@@ -4582,7 +4583,7 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
   // Get the parameters pointer from the stack.
   __ ldr(r2, MemOperand(sp, 1 * kPointerSize));
 
-  // Setup the elements pointer in the allocated arguments object and
+  // Set up the elements pointer in the allocated arguments object and
   // initialize the header in the elements fixed array.
   __ add(r4, r0, Operand(Heap::kArgumentsObjectSizeStrict));
   __ str(r4, FieldMemOperand(r0, JSObject::kElementsOffset));
@@ -4594,7 +4595,7 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
 
   // Copy the fixed array slots.
   Label loop;
-  // Setup r4 to point to the first array slot.
+  // Set up r4 to point to the first array slot.
   __ add(r4, r4, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
   __ bind(&loop);
   // Pre-decrement r2 with kPointerSize on each iteration.
@@ -5209,7 +5210,7 @@ void CallFunctionStub::Generate(MacroAssembler* masm) {
   // of the original receiver from the call site).
   __ bind(&non_function);
   __ str(r1, MemOperand(sp, argc_ * kPointerSize));
-  __ mov(r0, Operand(argc_));  // Setup the number of arguments.
+  __ mov(r0, Operand(argc_));  // Set up the number of arguments.
   __ mov(r2, Operand(0, RelocInfo::NONE));
   __ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION);
   __ SetCallKind(r5, CALL_AS_METHOD);
@@ -5730,7 +5731,7 @@ void StringHelper::GenerateHashInit(MacroAssembler* masm,
                                     Register hash,
                                     Register character) {
   // hash = character + (character << 10);
-  __ LoadRoot(hash, Heap::kStringHashSeedRootIndex);
+  __ LoadRoot(hash, Heap::kHashSeedRootIndex);
   // Untag smi seed and add the character.
   __ add(hash, character, Operand(hash, LSR, kSmiTagSize));
   // hash += hash << 10;
@@ -5759,13 +5760,12 @@ void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
   // hash ^= hash >> 11;
   __ eor(hash, hash, Operand(hash, LSR, 11));
   // hash += hash << 15;
-  __ add(hash, hash, Operand(hash, LSL, 15), SetCC);
+  __ add(hash, hash, Operand(hash, LSL, 15));
 
-  uint32_t kHashShiftCutOffMask = (1 << (32 - String::kHashShift)) - 1;
-  __ and_(hash, hash, Operand(kHashShiftCutOffMask));
+  __ and_(hash, hash, Operand(String::kHashBitMask), SetCC);
 
   // if (hash == 0) hash = 27;
-  __ mov(hash, Operand(27), LeaveCC, eq);
+  __ mov(hash, Operand(StringHasher::kZeroHash), LeaveCC, eq);
 }
 
 
diff --git a/deps/v8/src/arm/cpu-arm.cc b/deps/v8/src/arm/cpu-arm.cc
index 51cfeb6c8..7b08ed8c2 100644
--- a/deps/v8/src/arm/cpu-arm.cc
+++ b/deps/v8/src/arm/cpu-arm.cc
@@ -41,7 +41,7 @@
 namespace v8 {
 namespace internal {
 
-void CPU::Setup() {
+void CPU::SetUp() {
   CpuFeatures::Probe();
 }
 
diff --git a/deps/v8/src/arm/deoptimizer-arm.cc b/deps/v8/src/arm/deoptimizer-arm.cc
index 4b54b6dbc..3689a9f6b 100644
--- a/deps/v8/src/arm/deoptimizer-arm.cc
+++ b/deps/v8/src/arm/deoptimizer-arm.cc
@@ -319,7 +319,7 @@ void Deoptimizer::DoComputeOsrOutputFrame() {
     output_[0] = input_;
     output_[0]->SetPc(reinterpret_cast<uint32_t>(from_));
   } else {
-    // Setup the frame pointer and the context pointer.
+    // Set up the frame pointer and the context pointer.
     output_[0]->SetRegister(fp.code(), input_->GetRegister(fp.code()));
     output_[0]->SetRegister(cp.code(), input_->GetRegister(cp.code()));
 
@@ -723,10 +723,7 @@ void Deoptimizer::EntryGenerator::Generate() {
   __ pop(ip);  // remove sp
   __ pop(ip);  // remove lr
 
-  // Set up the roots register.
-  ExternalReference roots_array_start =
-      ExternalReference::roots_array_start(isolate);
-  __ mov(r10, Operand(roots_array_start));
+  __ InitializeRootRegister();
 
   __ pop(ip);  // remove pc
   __ pop(r7);  // get continuation, leave pc on stack
diff --git a/deps/v8/src/arm/full-codegen-arm.cc b/deps/v8/src/arm/full-codegen-arm.cc
index 7e9a88911..38999a8e3 100644
--- a/deps/v8/src/arm/full-codegen-arm.cc
+++ b/deps/v8/src/arm/full-codegen-arm.cc
@@ -1009,7 +1009,7 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ ldr(r1, FieldMemOperand(r1, DescriptorArray::kEnumerationIndexOffset));
   __ ldr(r2, FieldMemOperand(r1, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
-  // Setup the four remaining stack slots.
+  // Set up the four remaining stack slots.
   __ push(r0);  // Map.
   __ ldr(r1, FieldMemOperand(r2, FixedArray::kLengthOffset));
   __ mov(r0, Operand(Smi::FromInt(0)));
diff --git a/deps/v8/src/arm/lithium-arm.cc b/deps/v8/src/arm/lithium-arm.cc
index b001ecada..e063ef113 100644
--- a/deps/v8/src/arm/lithium-arm.cc
+++ b/deps/v8/src/arm/lithium-arm.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1038,14 +1038,23 @@ LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
 
 
 LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
-  HValue* v = instr->value();
-  if (v->EmitAtUses()) {
-    HBasicBlock* successor = HConstant::cast(v)->ToBoolean()
+  HValue* value = instr->value();
+  if (value->EmitAtUses()) {
+    HBasicBlock* successor = HConstant::cast(value)->ToBoolean()
         ? instr->FirstSuccessor()
         : instr->SecondSuccessor();
     return new LGoto(successor->block_id());
   }
-  return AssignEnvironment(new LBranch(UseRegister(v)));
+
+  LBranch* result = new LBranch(UseRegister(value));
+  // Tagged values that are not known smis or booleans require a
+  // deoptimization environment.
+  Representation rep = value->representation();
+  HType type = value->type();
+  if (rep.IsTagged() && !type.IsSmi() && !type.IsBoolean()) {
+    return AssignEnvironment(result);
+  }
+  return result;
 }
 
 
@@ -1344,7 +1353,12 @@ LInstruction* LChunkBuilder::DoMul(HMul* instr) {
     } else {
       left = UseRegisterAtStart(instr->LeastConstantOperand());
     }
-    return AssignEnvironment(DefineAsRegister(new LMulI(left, right, temp)));
+    LMulI* mul = new LMulI(left, right, temp);
+    if (instr->CheckFlag(HValue::kCanOverflow) ||
+        instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      AssignEnvironment(mul);
+    }
+    return DefineAsRegister(mul);
 
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::MUL, instr);
@@ -1413,6 +1427,15 @@ LInstruction* LChunkBuilder::DoPower(HPower* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
+  ASSERT(instr->representation().IsDouble());
+  ASSERT(instr->global_object()->representation().IsTagged());
+  LOperand* global_object = UseFixed(instr->global_object(), r0);
+  LRandom* result = new LRandom(global_object);
+  return MarkAsCall(DefineFixedDouble(result, d7), instr);
+}
+
+
 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
   ASSERT(instr->left()->representation().IsTagged());
   ASSERT(instr->right()->representation().IsTagged());
@@ -1529,7 +1552,7 @@ LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
 LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
     HClassOfTestAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
-  return new LClassOfTestAndBranch(UseTempRegister(instr->value()),
+  return new LClassOfTestAndBranch(UseRegister(instr->value()),
                                    TempRegister());
 }
 
@@ -1556,7 +1579,7 @@ LInstruction* LChunkBuilder::DoElementsKind(HElementsKind* instr) {
 LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
   LOperand* object = UseRegister(instr->value());
   LValueOf* result = new LValueOf(object, TempRegister());
-  return AssignEnvironment(DefineAsRegister(result));
+  return DefineAsRegister(result);
 }
 
 
@@ -1874,7 +1897,8 @@ LInstruction* LChunkBuilder::DoLoadKeyedFastElement(
   LOperand* obj = UseRegisterAtStart(instr->object());
   LOperand* key = UseRegisterAtStart(instr->key());
   LLoadKeyedFastElement* result = new LLoadKeyedFastElement(obj, key);
-  return AssignEnvironment(DefineAsRegister(result));
+  if (instr->RequiresHoleCheck()) AssignEnvironment(result);
+  return DefineAsRegister(result);
 }
 
 
diff --git a/deps/v8/src/arm/lithium-arm.h b/deps/v8/src/arm/lithium-arm.h
index 703666c4a..d3aff76e1 100644
--- a/deps/v8/src/arm/lithium-arm.h
+++ b/deps/v8/src/arm/lithium-arm.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -141,6 +141,7 @@ class LCodeGen;
   V(Parameter)                                  \
   V(Power)                                      \
   V(PushArgument)                               \
+  V(Random)                                     \
   V(RegExpLiteral)                              \
   V(Return)                                     \
   V(ShiftI)                                     \
@@ -1026,6 +1027,17 @@ class LPower: public LTemplateInstruction<1, 2, 0> {
 };
 
 
+class LRandom: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LRandom(LOperand* global_object) {
+    inputs_[0] = global_object;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Random, "random")
+  DECLARE_HYDROGEN_ACCESSOR(Random)
+};
+
+
 class LArithmeticD: public LTemplateInstruction<1, 2, 0> {
  public:
   LArithmeticD(Token::Value op, LOperand* left, LOperand* right)
diff --git a/deps/v8/src/arm/lithium-codegen-arm.cc b/deps/v8/src/arm/lithium-codegen-arm.cc
index e1e35d251..b5ed51708 100644
--- a/deps/v8/src/arm/lithium-codegen-arm.cc
+++ b/deps/v8/src/arm/lithium-codegen-arm.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1994,7 +1994,7 @@ void LCodeGen::DoHasCachedArrayIndexAndBranch(
 
 
 // Branches to a label or falls through with the answer in flags.  Trashes
-// the temp registers, but not the input.  Only input and temp2 may alias.
+// the temp registers, but not the input.
 void LCodeGen::EmitClassOfTest(Label* is_true,
                                Label* is_false,
                                Handle<String>class_name,
@@ -2002,7 +2002,9 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
                                Register temp,
                                Register temp2) {
   ASSERT(!input.is(temp));
-  ASSERT(!temp.is(temp2));  // But input and temp2 may be the same register.
+  ASSERT(!input.is(temp2));
+  ASSERT(!temp.is(temp2));
+
   __ JumpIfSmi(input, is_false);
 
   if (class_name->IsEqualTo(CStrVector("Function"))) {
@@ -2141,7 +2143,10 @@ void LCodeGen::DoInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr) {
   // We use Factory::the_hole_value() on purpose instead of loading from the
   // root array to force relocation to be able to later patch with
   // the cached map.
-  __ mov(ip, Operand(factory()->the_hole_value()));
+  Handle<JSGlobalPropertyCell> cell =
+      factory()->NewJSGlobalPropertyCell(factory()->the_hole_value());
+  __ mov(ip, Operand(Handle<Object>(cell)));
+  __ ldr(ip, FieldMemOperand(ip, JSGlobalPropertyCell::kValueOffset));
   __ cmp(map, Operand(ip));
   __ b(ne, &cache_miss);
   // We use Factory::the_hole_value() on purpose instead of loading from the
@@ -2901,7 +2906,7 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
   __ ldr(ip, FieldMemOperand(r1, JSFunction::kCodeEntryOffset));
   __ Call(ip);
 
-  // Setup deoptimization.
+  // Set up deoptimization.
   RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT);
 
   // Restore context.
@@ -3190,6 +3195,30 @@ void LCodeGen::DoPower(LPower* instr) {
 }
 
 
+void LCodeGen::DoRandom(LRandom* instr) {
+  // Having marked this instruction as a call we can use any
+  // registers.
+  ASSERT(ToDoubleRegister(instr->result()).is(d7));
+  ASSERT(ToRegister(instr->InputAt(0)).is(r0));
+
+  __ PrepareCallCFunction(1, scratch0());
+  __ ldr(r0, FieldMemOperand(r0, GlobalObject::kGlobalContextOffset));
+  __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
+
+  // 0x41300000 is the top half of 1.0 x 2^20 as a double.
+  // Create this constant using mov/orr to avoid PC relative load.
+  __ mov(r1, Operand(0x41000000));
+  __ orr(r1, r1, Operand(0x300000));
+  // Move 0x41300000xxxxxxxx (x = random bits) to VFP.
+  __ vmov(d7, r0, r1);
+  // Move 0x4130000000000000 to VFP.
+  __ mov(r0, Operand(0, RelocInfo::NONE));
+  __ vmov(d8, r0, r1);
+  // Subtract and store the result in the heap number.
+  __ vsub(d7, d7, d8);
+}
+
+
 void LCodeGen::DoMathLog(LUnaryMathOperation* instr) {
   ASSERT(ToDoubleRegister(instr->result()).is(d2));
   TranscendentalCacheStub stub(TranscendentalCache::LOG,
@@ -3874,6 +3903,7 @@ void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
 void LCodeGen::EmitNumberUntagD(Register input_reg,
                                 DoubleRegister result_reg,
                                 bool deoptimize_on_undefined,
+                                bool deoptimize_on_minus_zero,
                                 LEnvironment* env) {
   Register scratch = scratch0();
   SwVfpRegister flt_scratch = double_scratch0().low();
@@ -3909,6 +3939,14 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
   // Heap number to double register conversion.
   __ sub(ip, input_reg, Operand(kHeapObjectTag));
   __ vldr(result_reg, ip, HeapNumber::kValueOffset);
+  if (deoptimize_on_minus_zero) {
+    __ vmov(ip, result_reg.low());
+    __ cmp(ip, Operand(0));
+    __ b(ne, &done);
+    __ vmov(ip, result_reg.high());
+    __ cmp(ip, Operand(HeapNumber::kSignMask));
+    DeoptimizeIf(eq, env);
+  }
   __ jmp(&done);
 
   // Smi to double register conversion
@@ -4042,6 +4080,7 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
 
   EmitNumberUntagD(input_reg, result_reg,
                    instr->hydrogen()->deoptimize_on_undefined(),
+                   instr->hydrogen()->deoptimize_on_minus_zero(),
                    instr->environment());
 }
 
@@ -4155,14 +4194,26 @@ void LCodeGen::DoCheckFunction(LCheckFunction* instr) {
 }
 
 
+void LCodeGen::DoCheckMapCommon(Register reg,
+                                Register scratch,
+                                Handle<Map> map,
+                                CompareMapMode mode,
+                                LEnvironment* env) {
+  Label success;
+  __ CompareMap(reg, scratch, map, &success, mode);
+  DeoptimizeIf(ne, env);
+  __ bind(&success);
+}
+
+
 void LCodeGen::DoCheckMap(LCheckMap* instr) {
   Register scratch = scratch0();
   LOperand* input = instr->InputAt(0);
   ASSERT(input->IsRegister());
   Register reg = ToRegister(input);
-  __ ldr(scratch, FieldMemOperand(reg, HeapObject::kMapOffset));
-  __ cmp(scratch, Operand(instr->hydrogen()->map()));
-  DeoptimizeIf(ne, instr->environment());
+  Handle<Map> map = instr->hydrogen()->map();
+  DoCheckMapCommon(reg, scratch, map, instr->hydrogen()->mode(),
+                   instr->environment());
 }
 
 
@@ -4231,9 +4282,9 @@ void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
 
   // Check prototype maps up to the holder.
   while (!current_prototype.is_identical_to(holder)) {
-    __ ldr(temp2, FieldMemOperand(temp1, HeapObject::kMapOffset));
-    __ cmp(temp2, Operand(Handle<Map>(current_prototype->map())));
-    DeoptimizeIf(ne, instr->environment());
+    DoCheckMapCommon(temp1, temp2,
+                     Handle<Map>(current_prototype->map()),
+                     ALLOW_ELEMENT_TRANSITION_MAPS, instr->environment());
     current_prototype =
         Handle<JSObject>(JSObject::cast(current_prototype->GetPrototype()));
     // Load next prototype object.
@@ -4241,8 +4292,9 @@ void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
   }
 
   // Check the holder map.
-  __ ldr(temp2, FieldMemOperand(temp1, HeapObject::kMapOffset));
-  __ cmp(temp2, Operand(Handle<Map>(current_prototype->map())));
+  DoCheckMapCommon(temp1, temp2,
+                   Handle<Map>(current_prototype->map()),
+                   ALLOW_ELEMENT_TRANSITION_MAPS, instr->environment());
   DeoptimizeIf(ne, instr->environment());
 }
 
diff --git a/deps/v8/src/arm/lithium-codegen-arm.h b/deps/v8/src/arm/lithium-codegen-arm.h
index e6626481b..00823e163 100644
--- a/deps/v8/src/arm/lithium-codegen-arm.h
+++ b/deps/v8/src/arm/lithium-codegen-arm.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -119,6 +119,9 @@ class LCodeGen BASE_EMBEDDED {
   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
                                        Label* map_check);
 
+  void DoCheckMapCommon(Register reg, Register scratch, Handle<Map> map,
+                        CompareMapMode mode, LEnvironment* env);
+
   // Parallel move support.
   void DoParallelMove(LParallelMove* move);
   void DoGap(LGap* instr);
@@ -153,7 +156,7 @@ class LCodeGen BASE_EMBEDDED {
   HGraph* graph() const { return chunk_->graph(); }
 
   Register scratch0() { return r9; }
-  DwVfpRegister double_scratch0() { return d15; }
+  DwVfpRegister double_scratch0() { return kScratchDoubleReg; }
 
   int GetNextEmittedBlock(int block);
   LInstruction* GetNextInstruction();
@@ -270,6 +273,7 @@ class LCodeGen BASE_EMBEDDED {
   void EmitNumberUntagD(Register input,
                         DoubleRegister result,
                         bool deoptimize_on_undefined,
+                        bool deoptimize_on_minus_zero,
                         LEnvironment* env);
 
   // Emits optimized code for typeof x == "y".  Modifies input register.
@@ -408,7 +412,7 @@ class LDeferredCode: public ZoneObject {
   virtual void Generate() = 0;
   virtual LInstruction* instr() = 0;
 
-  void SetExit(Label *exit) { external_exit_ = exit; }
+  void SetExit(Label* exit) { external_exit_ = exit; }
   Label* entry() { return &entry_; }
   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
   int instruction_index() const { return instruction_index_; }
diff --git a/deps/v8/src/arm/lithium-gap-resolver-arm.cc b/deps/v8/src/arm/lithium-gap-resolver-arm.cc
index ee6cb8ec9..cefca476a 100644
--- a/deps/v8/src/arm/lithium-gap-resolver-arm.cc
+++ b/deps/v8/src/arm/lithium-gap-resolver-arm.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -34,7 +34,6 @@ namespace v8 {
 namespace internal {
 
 static const Register kSavedValueRegister = { 9 };
-static const DoubleRegister kSavedDoubleValueRegister = { 0 };
 
 LGapResolver::LGapResolver(LCodeGen* owner)
     : cgen_(owner), moves_(32), root_index_(0), in_cycle_(false),
@@ -172,9 +171,9 @@ void LGapResolver::BreakCycle(int index) {
   } else if (source->IsStackSlot()) {
     __ ldr(kSavedValueRegister, cgen_->ToMemOperand(source));
   } else if (source->IsDoubleRegister()) {
-    __ vmov(kSavedDoubleValueRegister, cgen_->ToDoubleRegister(source));
+    __ vmov(kScratchDoubleReg, cgen_->ToDoubleRegister(source));
   } else if (source->IsDoubleStackSlot()) {
-    __ vldr(kSavedDoubleValueRegister, cgen_->ToMemOperand(source));
+    __ vldr(kScratchDoubleReg, cgen_->ToMemOperand(source));
   } else {
     UNREACHABLE();
   }
@@ -193,11 +192,9 @@ void LGapResolver::RestoreValue() {
   } else if (saved_destination_->IsStackSlot()) {
     __ str(kSavedValueRegister, cgen_->ToMemOperand(saved_destination_));
   } else if (saved_destination_->IsDoubleRegister()) {
-    __ vmov(cgen_->ToDoubleRegister(saved_destination_),
-            kSavedDoubleValueRegister);
+    __ vmov(cgen_->ToDoubleRegister(saved_destination_), kScratchDoubleReg);
   } else if (saved_destination_->IsDoubleStackSlot()) {
-    __ vstr(kSavedDoubleValueRegister,
-            cgen_->ToMemOperand(saved_destination_));
+    __ vstr(kScratchDoubleReg, cgen_->ToMemOperand(saved_destination_));
   } else {
     UNREACHABLE();
   }
@@ -235,8 +232,8 @@ void LGapResolver::EmitMove(int index) {
           // ip is overwritten while saving the value to the destination.
           // Therefore we can't use ip.  It is OK if the read from the source
           // destroys ip, since that happens before the value is read.
-          __ vldr(kSavedDoubleValueRegister.low(), source_operand);
-          __ vstr(kSavedDoubleValueRegister.low(), destination_operand);
+          __ vldr(kScratchDoubleReg.low(), source_operand);
+          __ vstr(kScratchDoubleReg.low(), destination_operand);
         } else {
           __ ldr(ip, source_operand);
           __ str(ip, destination_operand);
@@ -297,8 +294,8 @@ void LGapResolver::EmitMove(int index) {
         __ ldr(kSavedValueRegister, source_high_operand);
         __ str(kSavedValueRegister, destination_high_operand);
       } else {
-        __ vldr(kSavedDoubleValueRegister, source_operand);
-        __ vstr(kSavedDoubleValueRegister, destination_operand);
+        __ vldr(kScratchDoubleReg, source_operand);
+        __ vstr(kScratchDoubleReg, destination_operand);
       }
     }
   } else {
diff --git a/deps/v8/src/arm/macro-assembler-arm.cc b/deps/v8/src/arm/macro-assembler-arm.cc
index 59a5e5ba7..fa97611cf 100644
--- a/deps/v8/src/arm/macro-assembler-arm.cc
+++ b/deps/v8/src/arm/macro-assembler-arm.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -396,14 +396,14 @@ void MacroAssembler::Usat(Register dst, int satpos, const Operand& src,
 void MacroAssembler::LoadRoot(Register destination,
                               Heap::RootListIndex index,
                               Condition cond) {
-  ldr(destination, MemOperand(roots, index << kPointerSizeLog2), cond);
+  ldr(destination, MemOperand(kRootRegister, index << kPointerSizeLog2), cond);
 }
 
 
 void MacroAssembler::StoreRoot(Register source,
                                Heap::RootListIndex index,
                                Condition cond) {
-  str(source, MemOperand(roots, index << kPointerSizeLog2), cond);
+  str(source, MemOperand(kRootRegister, index << kPointerSizeLog2), cond);
 }
 
 
@@ -496,13 +496,10 @@ void MacroAssembler::RecordWrite(Register object,
   // registers are cp.
   ASSERT(!address.is(cp) && !value.is(cp));
 
-  if (FLAG_debug_code) {
-    Label ok;
+  if (emit_debug_code()) {
     ldr(ip, MemOperand(address));
     cmp(ip, value);
-    b(eq, &ok);
-    stop("Wrong address or value passed to RecordWrite");
-    bind(&ok);
+    Check(eq, "Wrong address or value passed to RecordWrite");
   }
 
   Label done;
@@ -551,7 +548,7 @@ void MacroAssembler::RememberedSetHelper(Register object,  // For debug tests.
                                          SaveFPRegsMode fp_mode,
                                          RememberedSetFinalAction and_then) {
   Label done;
-  if (FLAG_debug_code) {
+  if (emit_debug_code()) {
     Label ok;
     JumpIfNotInNewSpace(object, scratch, &ok);
     stop("Remembered set pointer is in new space");
@@ -820,12 +817,12 @@ void MacroAssembler::LeaveFrame(StackFrame::Type type) {
 
 
 void MacroAssembler::EnterExitFrame(bool save_doubles, int stack_space) {
-  // Setup the frame structure on the stack.
+  // Set up the frame structure on the stack.
   ASSERT_EQ(2 * kPointerSize, ExitFrameConstants::kCallerSPDisplacement);
   ASSERT_EQ(1 * kPointerSize, ExitFrameConstants::kCallerPCOffset);
   ASSERT_EQ(0 * kPointerSize, ExitFrameConstants::kCallerFPOffset);
   Push(lr, fp);
-  mov(fp, Operand(sp));  // Setup new frame pointer.
+  mov(fp, Operand(sp));  // Set up new frame pointer.
   // Reserve room for saved entry sp and code object.
   sub(sp, sp, Operand(2 * kPointerSize));
   if (emit_debug_code()) {
@@ -1414,6 +1411,35 @@ void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
 }
 
 
+void MacroAssembler::GetNumberHash(Register t0, Register scratch) {
+  // First of all we assign the hash seed to scratch.
+  LoadRoot(scratch, Heap::kHashSeedRootIndex);
+  SmiUntag(scratch);
+
+  // Xor original key with a seed.
+  eor(t0, t0, Operand(scratch));
+
+  // Compute the hash code from the untagged key.  This must be kept in sync
+  // with ComputeIntegerHash in utils.h.
+  //
+  // hash = ~hash + (hash << 15);
+  mvn(scratch, Operand(t0));
+  add(t0, scratch, Operand(t0, LSL, 15));
+  // hash = hash ^ (hash >> 12);
+  eor(t0, t0, Operand(t0, LSR, 12));
+  // hash = hash + (hash << 2);
+  add(t0, t0, Operand(t0, LSL, 2));
+  // hash = hash ^ (hash >> 4);
+  eor(t0, t0, Operand(t0, LSR, 4));
+  // hash = hash * 2057;
+  mov(scratch, Operand(t0, LSL, 11));
+  add(t0, t0, Operand(t0, LSL, 3));
+  add(t0, t0, scratch);
+  // hash = hash ^ (hash >> 16);
+  eor(t0, t0, Operand(t0, LSR, 16));
+}
+
+
 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
                                               Register elements,
                                               Register key,
@@ -1443,26 +1469,10 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   // t2 - used for the index into the dictionary.
   Label done;
 
-  // Compute the hash code from the untagged key.  This must be kept in sync
-  // with ComputeIntegerHash in utils.h.
-  //
-  // hash = ~hash + (hash << 15);
-  mvn(t1, Operand(t0));
-  add(t0, t1, Operand(t0, LSL, 15));
-  // hash = hash ^ (hash >> 12);
-  eor(t0, t0, Operand(t0, LSR, 12));
-  // hash = hash + (hash << 2);
-  add(t0, t0, Operand(t0, LSL, 2));
-  // hash = hash ^ (hash >> 4);
-  eor(t0, t0, Operand(t0, LSR, 4));
-  // hash = hash * 2057;
-  mov(t1, Operand(2057));
-  mul(t0, t0, t1);
-  // hash = hash ^ (hash >> 16);
-  eor(t0, t0, Operand(t0, LSR, 16));
+  GetNumberHash(t0, t1);
 
   // Compute the capacity mask.
-  ldr(t1, FieldMemOperand(elements, NumberDictionary::kCapacityOffset));
+  ldr(t1, FieldMemOperand(elements, SeededNumberDictionary::kCapacityOffset));
   mov(t1, Operand(t1, ASR, kSmiTagSize));  // convert smi to int
   sub(t1, t1, Operand(1));
 
@@ -1473,17 +1483,17 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
     mov(t2, t0);
     // Compute the masked index: (hash + i + i * i) & mask.
     if (i > 0) {
-      add(t2, t2, Operand(NumberDictionary::GetProbeOffset(i)));
+      add(t2, t2, Operand(SeededNumberDictionary::GetProbeOffset(i)));
     }
     and_(t2, t2, Operand(t1));
 
     // Scale the index by multiplying by the element size.
-    ASSERT(NumberDictionary::kEntrySize == 3);
+    ASSERT(SeededNumberDictionary::kEntrySize == 3);
     add(t2, t2, Operand(t2, LSL, 1));  // t2 = t2 * 3
 
     // Check if the key is identical to the name.
     add(t2, elements, Operand(t2, LSL, kPointerSizeLog2));
-    ldr(ip, FieldMemOperand(t2, NumberDictionary::kElementsStartOffset));
+    ldr(ip, FieldMemOperand(t2, SeededNumberDictionary::kElementsStartOffset));
     cmp(key, Operand(ip));
     if (i != kProbes - 1) {
       b(eq, &done);
@@ -1496,14 +1506,14 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   // Check that the value is a normal property.
   // t2: elements + (index * kPointerSize)
   const int kDetailsOffset =
-      NumberDictionary::kElementsStartOffset + 2 * kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
   ldr(t1, FieldMemOperand(t2, kDetailsOffset));
   tst(t1, Operand(Smi::FromInt(PropertyDetails::TypeField::kMask)));
   b(ne, miss);
 
   // Get the value at the masked, scaled index and return.
   const int kValueOffset =
-      NumberDictionary::kElementsStartOffset + kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + kPointerSize;
   ldr(result, FieldMemOperand(t2, kValueOffset));
 }
 
@@ -1992,18 +2002,49 @@ void MacroAssembler::StoreNumberToDoubleElements(Register value_reg,
 }
 
 
+void MacroAssembler::CompareMap(Register obj,
+                                Register scratch,
+                                Handle<Map> map,
+                                Label* early_success,
+                                CompareMapMode mode) {
+  ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
+  cmp(scratch, Operand(map));
+  if (mode == ALLOW_ELEMENT_TRANSITION_MAPS) {
+    Map* transitioned_fast_element_map(
+        map->LookupElementsTransitionMap(FAST_ELEMENTS, NULL));
+    ASSERT(transitioned_fast_element_map == NULL ||
+           map->elements_kind() != FAST_ELEMENTS);
+    if (transitioned_fast_element_map != NULL) {
+      b(eq, early_success);
+      cmp(scratch, Operand(Handle<Map>(transitioned_fast_element_map)));
+    }
+
+    Map* transitioned_double_map(
+        map->LookupElementsTransitionMap(FAST_DOUBLE_ELEMENTS, NULL));
+    ASSERT(transitioned_double_map == NULL ||
+           map->elements_kind() == FAST_SMI_ONLY_ELEMENTS);
+    if (transitioned_double_map != NULL) {
+      b(eq, early_success);
+      cmp(scratch, Operand(Handle<Map>(transitioned_double_map)));
+    }
+  }
+}
+
+
 void MacroAssembler::CheckMap(Register obj,
                               Register scratch,
                               Handle<Map> map,
                               Label* fail,
-                              SmiCheckType smi_check_type) {
+                              SmiCheckType smi_check_type,
+                              CompareMapMode mode) {
   if (smi_check_type == DO_SMI_CHECK) {
     JumpIfSmi(obj, fail);
   }
-  ldr(scratch, FieldMemOperand(obj, HeapObject::kMapOffset));
-  mov(ip, Operand(map));
-  cmp(scratch, ip);
+
+  Label success;
+  CompareMap(obj, scratch, map, &success, mode);
   b(ne, fail);
+  bind(&success);
 }
 
 
@@ -3460,7 +3501,7 @@ void MacroAssembler::EnsureNotWhite(
   tst(mask_scratch, load_scratch);
   b(ne, &done);
 
-  if (FLAG_debug_code) {
+  if (emit_debug_code()) {
     // Check for impossible bit pattern.
     Label ok;
     // LSL may overflow, making the check conservative.
diff --git a/deps/v8/src/arm/macro-assembler-arm.h b/deps/v8/src/arm/macro-assembler-arm.h
index 392c2f750..4b55a3b06 100644
--- a/deps/v8/src/arm/macro-assembler-arm.h
+++ b/deps/v8/src/arm/macro-assembler-arm.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -52,7 +52,7 @@ inline Operand SmiUntagOperand(Register object) {
 
 // Give alias names to registers
 const Register cp = { 8 };  // JavaScript context pointer
-const Register roots = { 10 };  // Roots array pointer.
+const Register kRootRegister = { 10 };  // Roots array pointer.
 
 // Flags used for the AllocateInNewSpace functions.
 enum AllocationFlags {
@@ -499,10 +499,16 @@ class MacroAssembler: public Assembler {
                                     Register map,
                                     Register scratch);
 
+  void InitializeRootRegister() {
+    ExternalReference roots_array_start =
+        ExternalReference::roots_array_start(isolate());
+    mov(kRootRegister, Operand(roots_array_start));
+  }
+
   // ---------------------------------------------------------------------------
   // JavaScript invokes
 
-  // Setup call kind marking in ecx. The method takes ecx as an
+  // Set up call kind marking in ecx. The method takes ecx as an
   // explicit first parameter to make the code more readable at the
   // call sites.
   void SetCallKind(Register dst, CallKind kind);
@@ -584,6 +590,7 @@ class MacroAssembler: public Assembler {
                               Register scratch,
                               Label* miss);
 
+  void GetNumberHash(Register t0, Register scratch);
 
   void LoadFromNumberDictionary(Label* miss,
                                 Register elements,
@@ -790,15 +797,26 @@ class MacroAssembler: public Assembler {
                                    Register scratch4,
                                    Label* fail);
 
-  // Check if the map of an object is equal to a specified map (either
-  // given directly or as an index into the root list) and branch to
-  // label if not. Skip the smi check if not required (object is known
-  // to be a heap object)
+  // Compare an object's map with the specified map and its transitioned
+  // elements maps if mode is ALLOW_ELEMENT_TRANSITION_MAPS. Condition flags are
+  // set with result of map compare. If multiple map compares are required, the
+  // compare sequences branches to early_success.
+  void CompareMap(Register obj,
+                  Register scratch,
+                  Handle<Map> map,
+                  Label* early_success,
+                  CompareMapMode mode = REQUIRE_EXACT_MAP);
+
+  // Check if the map of an object is equal to a specified map and branch to
+  // label if not. Skip the smi check if not required (object is known to be a
+  // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
+  // against maps that are ElementsKind transition maps of the specificed map.
   void CheckMap(Register obj,
                 Register scratch,
                 Handle<Map> map,
                 Label* fail,
-                SmiCheckType smi_check_type);
+                SmiCheckType smi_check_type,
+                CompareMapMode mode = REQUIRE_EXACT_MAP);
 
 
   void CheckMap(Register obj,
diff --git a/deps/v8/src/arm/simulator-arm.cc b/deps/v8/src/arm/simulator-arm.cc
index 0525529fd..1ae172c00 100644
--- a/deps/v8/src/arm/simulator-arm.cc
+++ b/deps/v8/src/arm/simulator-arm.cc
@@ -741,7 +741,7 @@ Simulator::Simulator(Isolate* isolate) : isolate_(isolate) {
     isolate_->set_simulator_i_cache(i_cache_);
   }
   Initialize(isolate);
-  // Setup simulator support first. Some of this information is needed to
+  // Set up simulator support first. Some of this information is needed to
   // setup the architecture state.
   size_t stack_size = 1 * 1024*1024;  // allocate 1MB for stack
   stack_ = reinterpret_cast<char*>(malloc(stack_size));
@@ -750,7 +750,7 @@ Simulator::Simulator(Isolate* isolate) : isolate_(isolate) {
   break_pc_ = NULL;
   break_instr_ = 0;
 
-  // Setup architecture state.
+  // Set up architecture state.
   // All registers are initialized to zero to start with.
   for (int i = 0; i < num_registers; i++) {
     registers_[i] = 0;
@@ -3324,7 +3324,7 @@ void Simulator::Execute() {
 int32_t Simulator::Call(byte* entry, int argument_count, ...) {
   va_list parameters;
   va_start(parameters, argument_count);
-  // Setup arguments
+  // Set up arguments
 
   // First four arguments passed in registers.
   ASSERT(argument_count >= 4);
@@ -3367,7 +3367,7 @@ int32_t Simulator::Call(byte* entry, int argument_count, ...) {
   int32_t r10_val = get_register(r10);
   int32_t r11_val = get_register(r11);
 
-  // Setup the callee-saved registers with a known value. To be able to check
+  // Set up the callee-saved registers with a known value. To be able to check
   // that they are preserved properly across JS execution.
   int32_t callee_saved_value = icount_;
   set_register(r4, callee_saved_value);
diff --git a/deps/v8/src/arm/stub-cache-arm.cc b/deps/v8/src/arm/stub-cache-arm.cc
index b6b2ee2f0..c3a82ff93 100644
--- a/deps/v8/src/arm/stub-cache-arm.cc
+++ b/deps/v8/src/arm/stub-cache-arm.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -376,13 +376,9 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
   // r0 : value
   Label exit;
 
-  // Check that the receiver isn't a smi.
-  __ JumpIfSmi(receiver_reg, miss_label);
-
-  // Check that the map of the receiver hasn't changed.
-  __ ldr(scratch, FieldMemOperand(receiver_reg, HeapObject::kMapOffset));
-  __ cmp(scratch, Operand(Handle<Map>(object->map())));
-  __ b(ne, miss_label);
+  // Check that the map of the object hasn't changed.
+  __ CheckMap(receiver_reg, scratch, Handle<Map>(object->map()), miss_label,
+              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -1019,10 +1015,9 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
       __ ldr(reg, FieldMemOperand(scratch1, Map::kPrototypeOffset));
     } else {
       Handle<Map> current_map(current->map());
-      __ ldr(scratch1, FieldMemOperand(reg, HeapObject::kMapOffset));
-      __ cmp(scratch1, Operand(current_map));
-      // Branch on the result of the map check.
-      __ b(ne, miss);
+      __ CheckMap(reg, scratch1, current_map, miss, DONT_DO_SMI_CHECK,
+                  ALLOW_ELEMENT_TRANSITION_MAPS);
+
       // Check access rights to the global object.  This has to happen after
       // the map check so that we know that the object is actually a global
       // object.
@@ -1053,9 +1048,8 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
   LOG(masm()->isolate(), IntEvent("check-maps-depth", depth + 1));
 
   // Check the holder map.
-  __ ldr(scratch1, FieldMemOperand(reg, HeapObject::kMapOffset));
-  __ cmp(scratch1, Operand(Handle<Map>(current->map())));
-  __ b(ne, miss);
+  __ CheckMap(reg, scratch1, Handle<Map>(current->map()), miss,
+              DONT_DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform security check for access to the global object.
   ASSERT(holder->IsJSGlobalProxy() || !holder->IsAccessCheckNeeded());
@@ -1150,7 +1144,7 @@ void StubCompiler::GenerateLoadCallback(Handle<JSObject> object,
   __ EnterExitFrame(false, kApiStackSpace);
 
   // Create AccessorInfo instance on the stack above the exit frame with
-  // scratch2 (internal::Object **args_) as the data.
+  // scratch2 (internal::Object** args_) as the data.
   __ str(scratch2, MemOperand(sp, 1 * kPointerSize));
   __ add(r1, sp, Operand(1 * kPointerSize));  // r1 = AccessorInfo&
 
@@ -2411,7 +2405,7 @@ Handle<Code> CallStubCompiler::CompileCallGlobal(
     __ str(r3, MemOperand(sp, argc * kPointerSize));
   }
 
-  // Setup the context (function already in r1).
+  // Set up the context (function already in r1).
   __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
 
   // Jump to the cached code (tail call).
@@ -2472,13 +2466,9 @@ Handle<Code> StoreStubCompiler::CompileStoreCallback(
   // -----------------------------------
   Label miss;
 
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(r1, &miss);
-
   // Check that the map of the object hasn't changed.
-  __ ldr(r3, FieldMemOperand(r1, HeapObject::kMapOffset));
-  __ cmp(r3, Operand(Handle<Map>(object->map())));
-  __ b(ne, &miss);
+  __ CheckMap(r1, r3, Handle<Map>(object->map()), &miss,
+              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -2520,13 +2510,9 @@ Handle<Code> StoreStubCompiler::CompileStoreInterceptor(
   // -----------------------------------
   Label miss;
 
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(r1, &miss);
-
   // Check that the map of the object hasn't changed.
-  __ ldr(r3, FieldMemOperand(r1, HeapObject::kMapOffset));
-  __ cmp(r3, Operand(Handle<Map>(receiver->map())));
-  __ b(ne, &miss);
+  __ CheckMap(r1, r3, Handle<Map>(receiver->map()), &miss,
+              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (receiver->IsJSGlobalProxy()) {
diff --git a/deps/v8/src/assembler.h b/deps/v8/src/assembler.h
index cec20fca0..8c705a84b 100644
--- a/deps/v8/src/assembler.h
+++ b/deps/v8/src/assembler.h
@@ -371,7 +371,7 @@ class RelocInfo BASE_EMBEDDED {
   // routines expect to access these pointers indirectly. The following
   // location provides a place for these pointers to exist natually
   // when accessed via the Iterator.
-  Object *reconstructed_obj_ptr_;
+  Object* reconstructed_obj_ptr_;
   // External-reference pointers are also split across instruction-pairs
   // in mips, but are accessed via indirect pointers. This location
   // provides a place for that pointer to exist naturally. Its address
diff --git a/deps/v8/src/atomicops_internals_x86_macosx.h b/deps/v8/src/atomicops_internals_x86_macosx.h
index 2bac006bd..bfb02b385 100644
--- a/deps/v8/src/atomicops_internals_x86_macosx.h
+++ b/deps/v8/src/atomicops_internals_x86_macosx.h
@@ -35,7 +35,7 @@
 namespace v8 {
 namespace internal {
 
-inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
+inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
                                          Atomic32 old_value,
                                          Atomic32 new_value) {
   Atomic32 prev_value;
@@ -49,7 +49,7 @@ inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32 *ptr,
   return prev_value;
 }
 
-inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
+inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
                                          Atomic32 new_value) {
   Atomic32 old_value;
   do {
@@ -59,12 +59,12 @@ inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32 *ptr,
   return old_value;
 }
 
-inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32 *ptr,
+inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
                                           Atomic32 increment) {
   return OSAtomicAdd32(increment, const_cast<Atomic32*>(ptr));
 }
 
-inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32 *ptr,
+inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
                                           Atomic32 increment) {
   return OSAtomicAdd32Barrier(increment, const_cast<Atomic32*>(ptr));
 }
@@ -73,7 +73,7 @@ inline void MemoryBarrier() {
   OSMemoryBarrier();
 }
 
-inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
+inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
                                        Atomic32 old_value,
                                        Atomic32 new_value) {
   Atomic32 prev_value;
@@ -87,7 +87,7 @@ inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32 *ptr,
   return prev_value;
 }
 
-inline Atomic32 Release_CompareAndSwap(volatile Atomic32 *ptr,
+inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
                                        Atomic32 old_value,
                                        Atomic32 new_value) {
   return Acquire_CompareAndSwap(ptr, old_value, new_value);
@@ -97,12 +97,12 @@ inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
   *ptr = value;
 }
 
-inline void Acquire_Store(volatile Atomic32 *ptr, Atomic32 value) {
+inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
   *ptr = value;
   MemoryBarrier();
 }
 
-inline void Release_Store(volatile Atomic32 *ptr, Atomic32 value) {
+inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
   MemoryBarrier();
   *ptr = value;
 }
@@ -111,13 +111,13 @@ inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
   return *ptr;
 }
 
-inline Atomic32 Acquire_Load(volatile const Atomic32 *ptr) {
+inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
   Atomic32 value = *ptr;
   MemoryBarrier();
   return value;
 }
 
-inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
+inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
   MemoryBarrier();
   return *ptr;
 }
@@ -126,7 +126,7 @@ inline Atomic32 Release_Load(volatile const Atomic32 *ptr) {
 
 // 64-bit implementation on 64-bit platform
 
-inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64 *ptr,
+inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
                                          Atomic64 old_value,
                                          Atomic64 new_value) {
   Atomic64 prev_value;
@@ -140,7 +140,7 @@ inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64 *ptr,
   return prev_value;
 }
 
-inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64 *ptr,
+inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
                                          Atomic64 new_value) {
   Atomic64 old_value;
   do {
@@ -150,17 +150,17 @@ inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64 *ptr,
   return old_value;
 }
 
-inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64 *ptr,
+inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
                                           Atomic64 increment) {
   return OSAtomicAdd64(increment, const_cast<Atomic64*>(ptr));
 }
 
-inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64 *ptr,
+inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
                                         Atomic64 increment) {
   return OSAtomicAdd64Barrier(increment, const_cast<Atomic64*>(ptr));
 }
 
-inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr,
+inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
   Atomic64 prev_value;
@@ -174,7 +174,7 @@ inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64 *ptr,
   return prev_value;
 }
 
-inline Atomic64 Release_CompareAndSwap(volatile Atomic64 *ptr,
+inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
   // The lib kern interface does not distinguish between
@@ -186,12 +186,12 @@ inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
   *ptr = value;
 }
 
-inline void Acquire_Store(volatile Atomic64 *ptr, Atomic64 value) {
+inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
   *ptr = value;
   MemoryBarrier();
 }
 
-inline void Release_Store(volatile Atomic64 *ptr, Atomic64 value) {
+inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
   MemoryBarrier();
   *ptr = value;
 }
@@ -200,13 +200,13 @@ inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
   return *ptr;
 }
 
-inline Atomic64 Acquire_Load(volatile const Atomic64 *ptr) {
+inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
   Atomic64 value = *ptr;
   MemoryBarrier();
   return value;
 }
 
-inline Atomic64 Release_Load(volatile const Atomic64 *ptr) {
+inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
   MemoryBarrier();
   return *ptr;
 }
@@ -264,7 +264,7 @@ inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
       old_value, new_value);
 }
 
-inline void NoBarrier_Store(volatile AtomicWord *ptr, AtomicWord value) {
+inline void NoBarrier_Store(volatile AtomicWord* ptr, AtomicWord value) {
   NoBarrier_Store(
       reinterpret_cast<volatile AtomicWordCastType*>(ptr), value);
 }
@@ -279,7 +279,7 @@ inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value) {
       reinterpret_cast<volatile AtomicWordCastType*>(ptr), value);
 }
 
-inline AtomicWord NoBarrier_Load(volatile const AtomicWord *ptr) {
+inline AtomicWord NoBarrier_Load(volatile const AtomicWord* ptr) {
   return NoBarrier_Load(
       reinterpret_cast<volatile const AtomicWordCastType*>(ptr));
 }
diff --git a/deps/v8/src/bootstrapper.cc b/deps/v8/src/bootstrapper.cc
index d1bf975fb..752b220e5 100644
--- a/deps/v8/src/bootstrapper.cc
+++ b/deps/v8/src/bootstrapper.cc
@@ -264,13 +264,13 @@ class Genesis BASE_EMBEDDED {
   Handle<Map> CreateStrictModeFunctionMap(
       PrototypePropertyMode prototype_mode,
       Handle<JSFunction> empty_function,
-      Handle<FixedArray> arguments_callbacks,
-      Handle<FixedArray> caller_callbacks);
+      Handle<AccessorPair> arguments_callbacks,
+      Handle<AccessorPair> caller_callbacks);
 
   Handle<DescriptorArray> ComputeStrictFunctionInstanceDescriptor(
       PrototypePropertyMode propertyMode,
-      Handle<FixedArray> arguments,
-      Handle<FixedArray> caller);
+      Handle<AccessorPair> arguments,
+      Handle<AccessorPair> caller);
 
   static bool CompileBuiltin(Isolate* isolate, int index);
   static bool CompileExperimentalBuiltin(Isolate* isolate, int index);
@@ -378,7 +378,9 @@ static Handle<JSFunction> InstallFunction(Handle<JSObject> target,
   } else {
     attributes = DONT_ENUM;
   }
-  SetLocalPropertyNoThrow(target, symbol, function, attributes);
+  CHECK_NOT_EMPTY_HANDLE(isolate,
+                         JSObject::SetLocalPropertyIgnoreAttributes(
+                             target, symbol, function, attributes));
   if (is_ecma_native) {
     function->shared()->set_instance_class_name(*symbol);
   }
@@ -538,8 +540,8 @@ Handle<JSFunction> Genesis::CreateEmptyFunction(Isolate* isolate) {
 
 Handle<DescriptorArray> Genesis::ComputeStrictFunctionInstanceDescriptor(
     PrototypePropertyMode prototypeMode,
-    Handle<FixedArray> arguments,
-    Handle<FixedArray> caller) {
+    Handle<AccessorPair> arguments,
+    Handle<AccessorPair> caller) {
   Handle<DescriptorArray> descriptors =
       factory()->NewDescriptorArray(prototypeMode == DONT_ADD_PROTOTYPE
                                     ? 4
@@ -600,7 +602,7 @@ Handle<JSFunction> Genesis::GetThrowTypeErrorFunction() {
     throw_type_error_function->shared()->set_code(*code);
     throw_type_error_function->shared()->DontAdaptArguments();
 
-    PreventExtensions(throw_type_error_function);
+    JSObject::PreventExtensions(throw_type_error_function);
   }
   return throw_type_error_function;
 }
@@ -609,8 +611,8 @@ Handle<JSFunction> Genesis::GetThrowTypeErrorFunction() {
 Handle<Map> Genesis::CreateStrictModeFunctionMap(
     PrototypePropertyMode prototype_mode,
     Handle<JSFunction> empty_function,
-    Handle<FixedArray> arguments_callbacks,
-    Handle<FixedArray> caller_callbacks) {
+    Handle<AccessorPair> arguments_callbacks,
+    Handle<AccessorPair> caller_callbacks) {
   Handle<Map> map = factory()->NewMap(JS_FUNCTION_TYPE, JSFunction::kSize);
   Handle<DescriptorArray> descriptors =
       ComputeStrictFunctionInstanceDescriptor(prototype_mode,
@@ -627,8 +629,8 @@ void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
   // Create the callbacks arrays for ThrowTypeError functions.
   // The get/set callacks are filled in after the maps are created below.
   Factory* factory = empty->GetIsolate()->factory();
-  Handle<FixedArray> arguments = factory->NewFixedArray(2, TENURED);
-  Handle<FixedArray> caller = factory->NewFixedArray(2, TENURED);
+  Handle<AccessorPair> arguments(factory->NewAccessorPair());
+  Handle<AccessorPair> caller(factory->NewAccessorPair());
 
   // Allocate map for the strict mode function instances.
   Handle<Map> strict_mode_function_instance_map =
@@ -663,11 +665,11 @@ void Genesis::CreateStrictModeFunctionMaps(Handle<JSFunction> empty) {
   Handle<JSFunction> throw_function =
       GetThrowTypeErrorFunction();
 
-  // Complete the callback fixed arrays.
-  arguments->set(0, *throw_function);
-  arguments->set(1, *throw_function);
-  caller->set(0, *throw_function);
-  caller->set(1, *throw_function);
+  // Complete the callbacks.
+  arguments->set_getter(*throw_function);
+  arguments->set_setter(*throw_function);
+  caller->set_getter(*throw_function);
+  caller->set_setter(*throw_function);
 }
 
 
@@ -753,11 +755,10 @@ Handle<JSGlobalProxy> Genesis::CreateNewGlobals(
     Handle<JSObject> prototype =
         Handle<JSObject>(
             JSObject::cast(js_global_function->instance_prototype()));
-    SetLocalPropertyNoThrow(
-        prototype,
-        factory()->constructor_symbol(),
-        isolate()->object_function(),
-        NONE);
+    CHECK_NOT_EMPTY_HANDLE(isolate(),
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                               prototype, factory()->constructor_symbol(),
+                               isolate()->object_function(), NONE));
   } else {
     Handle<FunctionTemplateInfo> js_global_constructor(
         FunctionTemplateInfo::cast(js_global_template->constructor()));
@@ -834,7 +835,7 @@ void Genesis::HookUpInnerGlobal(Handle<GlobalObject> inner_global) {
                    factory()->LookupAsciiSymbol("global"),
                    inner_global,
                    attributes);
-  // Setup the reference from the global object to the builtins object.
+  // Set up the reference from the global object to the builtins object.
   JSGlobalObject::cast(*inner_global)->set_builtins(*builtins_global);
   TransferNamedProperties(inner_global_from_snapshot, inner_global);
   TransferIndexedProperties(inner_global_from_snapshot, inner_global);
@@ -863,8 +864,10 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
   Heap* heap = isolate->heap();
 
   Handle<String> object_name = Handle<String>(heap->Object_symbol());
-  SetLocalPropertyNoThrow(inner_global, object_name,
-                          isolate->object_function(), DONT_ENUM);
+  CHECK_NOT_EMPTY_HANDLE(isolate,
+                         JSObject::SetLocalPropertyIgnoreAttributes(
+                             inner_global, object_name,
+                             isolate->object_function(), DONT_ENUM));
 
   Handle<JSObject> global = Handle<JSObject>(global_context()->global());
 
@@ -1046,14 +1049,15 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
 
   {  // -- J S O N
     Handle<String> name = factory->NewStringFromAscii(CStrVector("JSON"));
-    Handle<JSFunction> cons = factory->NewFunction(
-        name,
-        factory->the_hole_value());
+    Handle<JSFunction> cons = factory->NewFunction(name,
+                                                   factory->the_hole_value());
     cons->SetInstancePrototype(global_context()->initial_object_prototype());
     cons->SetInstanceClassName(*name);
     Handle<JSObject> json_object = factory->NewJSObject(cons, TENURED);
     ASSERT(json_object->IsJSObject());
-    SetLocalPropertyNoThrow(global, name, json_object, DONT_ENUM);
+    CHECK_NOT_EMPTY_HANDLE(isolate,
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                                 global, name, json_object, DONT_ENUM));
     global_context()->set_json_object(*json_object);
   }
 
@@ -1083,12 +1087,14 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
     global_context()->set_arguments_boilerplate(*result);
     // Note: length must be added as the first property and
     //       callee must be added as the second property.
-    SetLocalPropertyNoThrow(result, factory->length_symbol(),
-                            factory->undefined_value(),
-                            DONT_ENUM);
-    SetLocalPropertyNoThrow(result, factory->callee_symbol(),
-                            factory->undefined_value(),
-                            DONT_ENUM);
+    CHECK_NOT_EMPTY_HANDLE(isolate,
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                               result, factory->length_symbol(),
+                               factory->undefined_value(), DONT_ENUM));
+    CHECK_NOT_EMPTY_HANDLE(isolate,
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                               result, factory->callee_symbol(),
+                               factory->undefined_value(), DONT_ENUM));
 
 #ifdef DEBUG
     LookupResult lookup(isolate);
@@ -1136,17 +1142,17 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
       static_cast<PropertyAttributes>(DONT_ENUM | DONT_DELETE | READ_ONLY);
 
     // Create the ThrowTypeError functions.
-    Handle<FixedArray> callee = factory->NewFixedArray(2, TENURED);
-    Handle<FixedArray> caller = factory->NewFixedArray(2, TENURED);
+    Handle<AccessorPair> callee = factory->NewAccessorPair();
+    Handle<AccessorPair> caller = factory->NewAccessorPair();
 
     Handle<JSFunction> throw_function =
         GetThrowTypeErrorFunction();
 
     // Install the ThrowTypeError functions.
-    callee->set(0, *throw_function);
-    callee->set(1, *throw_function);
-    caller->set(0, *throw_function);
-    caller->set(1, *throw_function);
+    callee->set_getter(*throw_function);
+    callee->set_setter(*throw_function);
+    caller->set_getter(*throw_function);
+    caller->set_setter(*throw_function);
 
     // Create the descriptor array for the arguments object.
     Handle<DescriptorArray> descriptors = factory->NewDescriptorArray(3);
@@ -1183,9 +1189,10 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
     global_context()->set_strict_mode_arguments_boilerplate(*result);
 
     // Add length property only for strict mode boilerplate.
-    SetLocalPropertyNoThrow(result, factory->length_symbol(),
-                            factory->undefined_value(),
-                            DONT_ENUM);
+    CHECK_NOT_EMPTY_HANDLE(isolate,
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                               result, factory->length_symbol(),
+                               factory->undefined_value(), DONT_ENUM));
 
 #ifdef DEBUG
     LookupResult lookup(isolate);
@@ -1353,7 +1360,7 @@ bool Genesis::CompileScriptCached(Vector<const char> name,
     if (cache != NULL) cache->Add(name, function_info);
   }
 
-  // Setup the function context. Conceptually, we should clone the
+  // Set up the function context. Conceptually, we should clone the
   // function before overwriting the context but since we're in a
   // single-threaded environment it is not strictly necessary.
   ASSERT(top_context->IsGlobalContext());
@@ -1440,7 +1447,7 @@ bool Genesis::InstallNatives() {
   builtins->set_global_context(*global_context());
   builtins->set_global_receiver(*builtins);
 
-  // Setup the 'global' properties of the builtins object. The
+  // Set up the 'global' properties of the builtins object. The
   // 'global' property that refers to the global object is the only
   // way to get from code running in the builtins context to the
   // global object.
@@ -1448,9 +1455,11 @@ bool Genesis::InstallNatives() {
       static_cast<PropertyAttributes>(READ_ONLY | DONT_DELETE);
   Handle<String> global_symbol = factory()->LookupAsciiSymbol("global");
   Handle<Object> global_obj(global_context()->global());
-  SetLocalPropertyNoThrow(builtins, global_symbol, global_obj, attributes);
+  CHECK_NOT_EMPTY_HANDLE(isolate(),
+                         JSObject::SetLocalPropertyIgnoreAttributes(
+                             builtins, global_symbol, global_obj, attributes));
 
-  // Setup the reference from the global object to the builtins object.
+  // Set up the reference from the global object to the builtins object.
   JSGlobalObject::cast(global_context()->global())->set_builtins(*builtins);
 
   // Create a bridge function that has context in the global context.
@@ -1674,7 +1683,7 @@ bool Genesis::InstallNatives() {
   InstallNativeFunctions();
 
   // Store the map for the string prototype after the natives has been compiled
-  // and the String function has been setup.
+  // and the String function has been set up.
   Handle<JSFunction> string_function(global_context()->string_function());
   ASSERT(JSObject::cast(
       string_function->initial_map()->prototype())->HasFastProperties());
@@ -1911,25 +1920,28 @@ bool Bootstrapper::InstallExtensions(Handle<Context> global_context,
 
 
 void Genesis::InstallSpecialObjects(Handle<Context> global_context) {
-  Factory* factory = global_context->GetIsolate()->factory();
+  Isolate* isolate = global_context->GetIsolate();
+  Factory* factory = isolate->factory();
   HandleScope scope;
-  Handle<JSGlobalObject> js_global(
-      JSGlobalObject::cast(global_context->global()));
+  Handle<JSGlobalObject> global(JSGlobalObject::cast(global_context->global()));
   // Expose the natives in global if a name for it is specified.
   if (FLAG_expose_natives_as != NULL && strlen(FLAG_expose_natives_as) != 0) {
-    Handle<String> natives_string =
-        factory->LookupAsciiSymbol(FLAG_expose_natives_as);
-    SetLocalPropertyNoThrow(js_global, natives_string,
-                            Handle<JSObject>(js_global->builtins()), DONT_ENUM);
+    Handle<String> natives = factory->LookupAsciiSymbol(FLAG_expose_natives_as);
+    CHECK_NOT_EMPTY_HANDLE(isolate,
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                               global, natives,
+                               Handle<JSObject>(global->builtins()),
+                               DONT_ENUM));
   }
 
-  Handle<Object> Error = GetProperty(js_global, "Error");
+  Handle<Object> Error = GetProperty(global, "Error");
   if (Error->IsJSObject()) {
     Handle<String> name = factory->LookupAsciiSymbol("stackTraceLimit");
-    SetLocalPropertyNoThrow(Handle<JSObject>::cast(Error),
-                            name,
-                            Handle<Smi>(Smi::FromInt(FLAG_stack_trace_limit)),
-                            NONE);
+    Handle<Smi> stack_trace_limit(Smi::FromInt(FLAG_stack_trace_limit));
+    CHECK_NOT_EMPTY_HANDLE(isolate,
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                               Handle<JSObject>::cast(Error), name,
+                               stack_trace_limit, NONE));
   }
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
@@ -1948,7 +1960,9 @@ void Genesis::InstallSpecialObjects(Handle<Context> global_context) {
     Handle<String> debug_string =
         factory->LookupAsciiSymbol(FLAG_expose_debug_as);
     Handle<Object> global_proxy(debug->debug_context()->global_proxy());
-    SetLocalPropertyNoThrow(js_global, debug_string, global_proxy, DONT_ENUM);
+    CHECK_NOT_EMPTY_HANDLE(isolate,
+                           JSObject::SetLocalPropertyIgnoreAttributes(
+                               global, debug_string, global_proxy, DONT_ENUM));
   }
 #endif
 }
@@ -2164,7 +2178,9 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
           Handle<String> key = Handle<String>(descs->GetKey(i));
           int index = descs->GetFieldIndex(i);
           Handle<Object> value = Handle<Object>(from->FastPropertyAt(index));
-          SetLocalPropertyNoThrow(to, key, value, details.attributes());
+          CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
+                                 JSObject::SetLocalPropertyIgnoreAttributes(
+                                     to, key, value, details.attributes()));
           break;
         }
         case CONSTANT_FUNCTION: {
@@ -2172,7 +2188,9 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
           Handle<String> key = Handle<String>(descs->GetKey(i));
           Handle<JSFunction> fun =
               Handle<JSFunction>(descs->GetConstantFunction(i));
-          SetLocalPropertyNoThrow(to, key, fun, details.attributes());
+          CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
+                                 JSObject::SetLocalPropertyIgnoreAttributes(
+                                     to, key, fun, details.attributes()));
           break;
         }
         case CALLBACKS: {
@@ -2187,7 +2205,7 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
           Handle<Object> callbacks(descs->GetCallbacksObject(i));
           PropertyDetails d =
               PropertyDetails(details.attributes(), CALLBACKS, details.index());
-          SetNormalizedProperty(to, key, callbacks, d);
+          JSObject::SetNormalizedProperty(to, key, callbacks, d);
           break;
         }
         case MAP_TRANSITION:
@@ -2224,7 +2242,9 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
           value = Handle<Object>(JSGlobalPropertyCell::cast(*value)->value());
         }
         PropertyDetails details = properties->DetailsAt(i);
-        SetLocalPropertyNoThrow(to, key, value, details.attributes());
+        CHECK_NOT_EMPTY_HANDLE(to->GetIsolate(),
+                               JSObject::SetLocalPropertyIgnoreAttributes(
+                                   to, key, value, details.attributes()));
       }
     }
   }
diff --git a/deps/v8/src/bootstrapper.h b/deps/v8/src/bootstrapper.h
index abf61b9fe..101c2e1b1 100644
--- a/deps/v8/src/bootstrapper.h
+++ b/deps/v8/src/bootstrapper.h
@@ -88,7 +88,7 @@ class SourceCodeCache BASE_EMBEDDED {
 // context.
 class Bootstrapper {
  public:
-  // Requires: Heap::Setup has been called.
+  // Requires: Heap::SetUp has been called.
   void Initialize(bool create_heap_objects);
   void TearDown();
 
diff --git a/deps/v8/src/builtins.cc b/deps/v8/src/builtins.cc
index 916799499..69e5161ce 100644
--- a/deps/v8/src/builtins.cc
+++ b/deps/v8/src/builtins.cc
@@ -1719,7 +1719,7 @@ void Builtins::InitBuiltinFunctionTable() {
 #undef DEF_FUNCTION_PTR_A
 }
 
-void Builtins::Setup(bool create_heap_objects) {
+void Builtins::SetUp(bool create_heap_objects) {
   ASSERT(!initialized_);
   Isolate* isolate = Isolate::Current();
   Heap* heap = isolate->heap();
diff --git a/deps/v8/src/builtins.h b/deps/v8/src/builtins.h
index 6a84f2ddd..f20d97df5 100644
--- a/deps/v8/src/builtins.h
+++ b/deps/v8/src/builtins.h
@@ -265,7 +265,7 @@ class Builtins {
 
   // Generate all builtin code objects. Should be called once during
   // isolate initialization.
-  void Setup(bool create_heap_objects);
+  void SetUp(bool create_heap_objects);
   void TearDown();
 
   // Garbage collection support.
diff --git a/deps/v8/src/code-stubs.cc b/deps/v8/src/code-stubs.cc
index 85410c3cc..5fa9a2b5c 100644
--- a/deps/v8/src/code-stubs.cc
+++ b/deps/v8/src/code-stubs.cc
@@ -40,7 +40,7 @@ namespace internal {
 bool CodeStub::FindCodeInCache(Code** code_out) {
   Heap* heap = Isolate::Current()->heap();
   int index = heap->code_stubs()->FindEntry(GetKey());
-  if (index != NumberDictionary::kNotFound) {
+  if (index != UnseededNumberDictionary::kNotFound) {
     *code_out = Code::cast(heap->code_stubs()->ValueAt(index));
     return true;
   }
@@ -132,9 +132,9 @@ Handle<Code> CodeStub::GetCode() {
       AddToSpecialCache(new_object);
     } else {
       // Update the dictionary and the root in Heap.
-      Handle<NumberDictionary> dict =
+      Handle<UnseededNumberDictionary> dict =
           factory->DictionaryAtNumberPut(
-              Handle<NumberDictionary>(heap->code_stubs()),
+              Handle<UnseededNumberDictionary>(heap->code_stubs()),
               GetKey(),
               new_object);
       heap->public_set_code_stubs(*dict);
diff --git a/deps/v8/src/compiler.cc b/deps/v8/src/compiler.cc
index d2a4a0bfd..362273e27 100644
--- a/deps/v8/src/compiler.cc
+++ b/deps/v8/src/compiler.cc
@@ -628,7 +628,7 @@ bool Compiler::CompileLazy(CompilationInfo* info) {
         // scope info.  Please note, that the order of the shared function
         // info initialization is important since set_scope_info might
         // trigger a GC, causing the ASSERT below to be invalid if the code
-        // was flushed. By settting the code object last we avoid this.
+        // was flushed. By setting the code object last we avoid this.
         Handle<ScopeInfo> scope_info = ScopeInfo::Create(info->scope());
         shared->set_scope_info(*scope_info);
         shared->set_code(*code);
diff --git a/deps/v8/src/cpu-profiler.cc b/deps/v8/src/cpu-profiler.cc
index d74c034ac..2bd62ad39 100644
--- a/deps/v8/src/cpu-profiler.cc
+++ b/deps/v8/src/cpu-profiler.cc
@@ -493,7 +493,7 @@ void CpuProfiler::StartProcessorIfNotStarted() {
     NoBarrier_Store(&is_profiling_, true);
     processor_->Start();
     // Enumerate stuff we already have in the heap.
-    if (isolate->heap()->HasBeenSetup()) {
+    if (isolate->heap()->HasBeenSetUp()) {
       if (!FLAG_prof_browser_mode) {
         bool saved_log_code_flag = FLAG_log_code;
         FLAG_log_code = true;
@@ -562,7 +562,7 @@ void CpuProfiler::StopProcessor() {
 }
 
 
-void CpuProfiler::Setup() {
+void CpuProfiler::SetUp() {
   Isolate* isolate = Isolate::Current();
   if (isolate->cpu_profiler() == NULL) {
     isolate->set_cpu_profiler(new CpuProfiler());
diff --git a/deps/v8/src/cpu-profiler.h b/deps/v8/src/cpu-profiler.h
index a71c0e0ab..3f4fec5f4 100644
--- a/deps/v8/src/cpu-profiler.h
+++ b/deps/v8/src/cpu-profiler.h
@@ -204,7 +204,7 @@ namespace internal {
 // TODO(isolates): isolatify this class.
 class CpuProfiler {
  public:
-  static void Setup();
+  static void SetUp();
   static void TearDown();
 
   static void StartProfiling(const char* title);
@@ -230,11 +230,11 @@ class CpuProfiler {
                               Code* code, String* name);
   static void CodeCreateEvent(Logger::LogEventsAndTags tag,
                               Code* code,
-                              SharedFunctionInfo *shared,
+                              SharedFunctionInfo* shared,
                               String* name);
   static void CodeCreateEvent(Logger::LogEventsAndTags tag,
                               Code* code,
-                              SharedFunctionInfo *shared,
+                              SharedFunctionInfo* shared,
                               String* source, int line);
   static void CodeCreateEvent(Logger::LogEventsAndTags tag,
                               Code* code, int args_count);
diff --git a/deps/v8/src/cpu.h b/deps/v8/src/cpu.h
index 2525484a0..247af71aa 100644
--- a/deps/v8/src/cpu.h
+++ b/deps/v8/src/cpu.h
@@ -53,7 +53,7 @@ namespace internal {
 class CPU : public AllStatic {
  public:
   // Initializes the cpu architecture support. Called once at VM startup.
-  static void Setup();
+  static void SetUp();
 
   static bool SupportsCrankshaft();
 
diff --git a/deps/v8/src/d8-debug.cc b/deps/v8/src/d8-debug.cc
index 8fbc876da..1cbc0b39a 100644
--- a/deps/v8/src/d8-debug.cc
+++ b/deps/v8/src/d8-debug.cc
@@ -169,7 +169,7 @@ void RemoteDebugger::Run() {
   bool ok;
 
   // Make sure that socket support is initialized.
-  ok = i::Socket::Setup();
+  ok = i::Socket::SetUp();
   if (!ok) {
     printf("Unable to initialize socket support %d\n", i::Socket::LastError());
     return;
diff --git a/deps/v8/src/d8.cc b/deps/v8/src/d8.cc
index ad850f5ee..97828a4ac 100644
--- a/deps/v8/src/d8.cc
+++ b/deps/v8/src/d8.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -281,63 +281,161 @@ Handle<Value> Shell::Load(const Arguments& args) {
   return Undefined();
 }
 
+static size_t convertToUint(Local<Value> value_in, TryCatch* try_catch) {
+  if (value_in->IsUint32()) {
+    return value_in->Uint32Value();
+  }
+
+  Local<Value> number = value_in->ToNumber();
+  if (try_catch->HasCaught()) return 0;
+
+  ASSERT(number->IsNumber());
+  Local<Int32> int32 = number->ToInt32();
+  if (try_catch->HasCaught() || int32.IsEmpty()) return 0;
+
+  int32_t raw_value = int32->Int32Value();
+  if (try_catch->HasCaught()) return 0;
+
+  if (raw_value < 0) {
+    ThrowException(String::New("Array length must not be negative."));
+    return 0;
+  }
+
+  static const int kMaxLength = 0x3fffffff;
+#ifndef V8_SHARED
+  ASSERT(kMaxLength == i::ExternalArray::kMaxLength);
+#endif  // V8_SHARED
+  if (raw_value > static_cast<int32_t>(kMaxLength)) {
+    ThrowException(
+        String::New("Array length exceeds maximum length."));
+  }
+  return static_cast<size_t>(raw_value);
+}
+
+
+const char kArrayBufferReferencePropName[] = "_is_array_buffer_";
+const char kArrayBufferMarkerPropName[] = "_array_buffer_ref_";
+
 
 Handle<Value> Shell::CreateExternalArray(const Arguments& args,
                                          ExternalArrayType type,
                                          size_t element_size) {
+  TryCatch try_catch;
+  bool is_array_buffer_construct = element_size == 0;
+  if (is_array_buffer_construct) {
+    type = v8::kExternalByteArray;
+    element_size = 1;
+  }
   ASSERT(element_size == 1 || element_size == 2 || element_size == 4 ||
          element_size == 8);
-  if (args.Length() != 1) {
+  if (args.Length() == 0) {
     return ThrowException(
-        String::New("Array constructor needs one parameter."));
+        String::New("Array constructor must have at least one "
+                    "parameter."));
   }
-  static const int kMaxLength = 0x3fffffff;
-#ifndef V8_SHARED
-  ASSERT(kMaxLength == i::ExternalArray::kMaxLength);
-#endif  // V8_SHARED
-  size_t length = 0;
-  TryCatch try_catch;
-  if (args[0]->IsUint32()) {
-    length = args[0]->Uint32Value();
-  } else {
-    Local<Number> number = args[0]->ToNumber();
-    if (number.IsEmpty()) {
-      ASSERT(try_catch.HasCaught());
-      return try_catch.Exception();
+  bool first_arg_is_array_buffer =
+      args[0]->IsObject() &&
+      args[0]->ToObject()->Get(
+          String::New(kArrayBufferMarkerPropName))->IsTrue();
+  // Currently, only the following constructors are supported:
+  //   TypedArray(unsigned long length)
+  //   TypedArray(ArrayBuffer buffer,
+  //              optional unsigned long byteOffset,
+  //              optional unsigned long length)
+  if (args.Length() > 3) {
+    return ThrowException(
+        String::New("Array constructor from ArrayBuffer must "
+                    "have 1-3 parameters."));
+  }
+
+  Local<Value> length_value = (args.Length() < 3)
+      ? (first_arg_is_array_buffer
+         ? args[0]->ToObject()->Get(String::New("length"))
+         : args[0])
+      : args[2];
+  size_t length = convertToUint(length_value, &try_catch);
+  if (try_catch.HasCaught()) return try_catch.Exception();
+
+  void* data = NULL;
+  size_t offset = 0;
+
+  Handle<Object> array = Object::New();
+  if (first_arg_is_array_buffer) {
+    Handle<Object> derived_from = args[0]->ToObject();
+    data = derived_from->GetIndexedPropertiesExternalArrayData();
+
+    size_t array_buffer_length = convertToUint(
+        derived_from->Get(String::New("length")),
+        &try_catch);
+    if (try_catch.HasCaught()) return try_catch.Exception();
+
+    if (data == NULL && array_buffer_length != 0) {
+      return ThrowException(
+          String::New("ArrayBuffer doesn't have data"));
     }
-    ASSERT(number->IsNumber());
-    Local<Int32> int32 = number->ToInt32();
-    if (int32.IsEmpty()) {
-      if (try_catch.HasCaught()) {
-        return try_catch.Exception();
+
+    if (args.Length() > 1) {
+      offset = convertToUint(args[1], &try_catch);
+      if (try_catch.HasCaught()) return try_catch.Exception();
+
+      // The given byteOffset must be a multiple of the element size of the
+      // specific type, otherwise an exception is raised.
+      if (offset % element_size != 0) {
+        return ThrowException(
+            String::New("offset must be multiple of element_size"));
       }
     }
-    int32_t raw_length = int32->Int32Value();
-    if (try_catch.HasCaught()) {
-      return try_catch.Exception();
+
+    if (offset > array_buffer_length) {
+      return ThrowException(
+          String::New("byteOffset must be less than ArrayBuffer length."));
     }
-    if (raw_length < 0) {
-      return ThrowException(String::New("Array length must not be negative."));
+
+    if (args.Length() == 2) {
+      // If length is not explicitly specified, the length of the ArrayBuffer
+      // minus the byteOffset must be a multiple of the element size of the
+      // specific type, or an exception is raised.
+      length = array_buffer_length - offset;
+    }
+
+    if (args.Length() != 3) {
+      if (length % element_size != 0) {
+        return ThrowException(
+            String::New("ArrayBuffer length minus the byteOffset must be a "
+                        "multiple of the element size"));
+      }
+      length /= element_size;
     }
-    if (raw_length > static_cast<int32_t>(kMaxLength)) {
+
+    // If a given byteOffset and length references an area beyond the end of
+    // the ArrayBuffer an exception is raised.
+    if (offset + (length * element_size) > array_buffer_length) {
       return ThrowException(
-          String::New("Array length exceeds maximum length."));
+          String::New("length references an area beyond the end of the "
+                      "ArrayBuffer"));
     }
-    length = static_cast<size_t>(raw_length);
-  }
-  if (length > static_cast<size_t>(kMaxLength)) {
-    return ThrowException(String::New("Array length exceeds maximum length."));
+
+    // Hold a reference to the ArrayBuffer so its buffer doesn't get collected.
+    array->Set(String::New(kArrayBufferReferencePropName), args[0], ReadOnly);
   }
-  void* data = calloc(length, element_size);
-  if (data == NULL) {
-    return ThrowException(String::New("Memory allocation failed."));
+
+  if (is_array_buffer_construct) {
+    array->Set(String::New(kArrayBufferMarkerPropName), True(), ReadOnly);
   }
-  Handle<Object> array = Object::New();
+
   Persistent<Object> persistent_array = Persistent<Object>::New(array);
   persistent_array.MakeWeak(data, ExternalArrayWeakCallback);
   persistent_array.MarkIndependent();
-  array->SetIndexedPropertiesToExternalArrayData(data, type,
-                                                 static_cast<int>(length));
+  if (data == NULL && length != 0) {
+    data = calloc(length, element_size);
+    if (data == NULL) {
+      return ThrowException(String::New("Memory allocation failed."));
+    }
+  }
+
+  array->SetIndexedPropertiesToExternalArrayData(
+      reinterpret_cast<uint8_t*>(data) + offset, type,
+      static_cast<int>(length));
   array->Set(String::New("length"),
              Int32::New(static_cast<int32_t>(length)), ReadOnly);
   array->Set(String::New("BYTES_PER_ELEMENT"),
@@ -347,11 +445,22 @@ Handle<Value> Shell::CreateExternalArray(const Arguments& args,
 
 
 void Shell::ExternalArrayWeakCallback(Persistent<Value> object, void* data) {
-  free(data);
+  HandleScope scope;
+  Handle<String> prop_name = String::New(kArrayBufferReferencePropName);
+  Handle<Object> converted_object = object->ToObject();
+  Local<Value> prop_value = converted_object->Get(prop_name);
+  if (data != NULL && !prop_value->IsObject()) {
+    free(data);
+  }
   object.Dispose();
 }
 
 
+Handle<Value> Shell::ArrayBuffer(const Arguments& args) {
+  return CreateExternalArray(args, v8::kExternalByteArray, 0);
+}
+
+
 Handle<Value> Shell::Int8Array(const Arguments& args) {
   return CreateExternalArray(args, v8::kExternalByteArray, sizeof(int8_t));
 }
@@ -693,6 +802,8 @@ Handle<ObjectTemplate> Shell::CreateGlobalTemplate() {
                        FunctionTemplate::New(DisableProfiler));
 
   // Bind the handlers for external arrays.
+  global_template->Set(String::New("ArrayBuffer"),
+                       FunctionTemplate::New(ArrayBuffer));
   global_template->Set(String::New("Int8Array"),
                        FunctionTemplate::New(Int8Array));
   global_template->Set(String::New("Uint8Array"),
diff --git a/deps/v8/src/d8.h b/deps/v8/src/d8.h
index 15d8d5d50..6c7733ccf 100644
--- a/deps/v8/src/d8.h
+++ b/deps/v8/src/d8.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -289,6 +289,7 @@ class Shell : public i::AllStatic {
   static Handle<Value> Read(const Arguments& args);
   static Handle<Value> ReadLine(const Arguments& args);
   static Handle<Value> Load(const Arguments& args);
+  static Handle<Value> ArrayBuffer(const Arguments& args);
   static Handle<Value> Int8Array(const Arguments& args);
   static Handle<Value> Uint8Array(const Arguments& args);
   static Handle<Value> Int16Array(const Arguments& args);
diff --git a/deps/v8/src/debug-debugger.js b/deps/v8/src/debug-debugger.js
index 8cbe0b362..120a29700 100644
--- a/deps/v8/src/debug-debugger.js
+++ b/deps/v8/src/debug-debugger.js
@@ -1547,7 +1547,7 @@ DebugCommandProcessor.prototype.continueRequest_ = function(request, response) {
       }
     }
 
-    // Setup the VM for stepping.
+    // Set up the VM for stepping.
     this.exec_state_.prepareStep(action, count);
   }
 
diff --git a/deps/v8/src/debug.cc b/deps/v8/src/debug.cc
index 24e17823d..ffba7821c 100644
--- a/deps/v8/src/debug.cc
+++ b/deps/v8/src/debug.cc
@@ -682,7 +682,7 @@ void ScriptCache::HandleWeakScript(v8::Persistent<v8::Value> obj, void* data) {
 }
 
 
-void Debug::Setup(bool create_heap_objects) {
+void Debug::SetUp(bool create_heap_objects) {
   ThreadInit();
   if (create_heap_objects) {
     // Get code to handle debug break on return.
@@ -827,8 +827,8 @@ bool Debug::Load() {
   Handle<GlobalObject> global = Handle<GlobalObject>(context->global());
   RETURN_IF_EMPTY_HANDLE_VALUE(
       isolate_,
-      SetProperty(global, key, Handle<Object>(global->builtins()),
-                  NONE, kNonStrictMode),
+      JSReceiver::SetProperty(global, key, Handle<Object>(global->builtins()),
+                              NONE, kNonStrictMode),
       false);
 
   // Compile the JavaScript for the debugger in the debugger context.
@@ -1213,7 +1213,7 @@ void Debug::ClearAllBreakPoints() {
 
 void Debug::FloodWithOneShot(Handle<SharedFunctionInfo> shared) {
   PrepareForBreakPoints();
-  // Make sure the function has setup the debug info.
+  // Make sure the function has set up the debug info.
   if (!EnsureDebugInfo(shared)) {
     // Return if we failed to retrieve the debug info.
     return;
@@ -2855,7 +2855,7 @@ void Debugger::NotifyMessageHandler(v8::DebugEvent event,
     command.Dispose();
 
     // Return from debug event processing if either the VM is put into the
-    // runnning state (through a continue command) or auto continue is active
+    // running state (through a continue command) or auto continue is active
     // and there are no more commands queued.
     if (running && !HasCommands()) {
       return;
@@ -3065,7 +3065,7 @@ bool Debugger::StartAgent(const char* name, int port,
     v8::Debug::DebugBreak();
   }
 
-  if (Socket::Setup()) {
+  if (Socket::SetUp()) {
     if (agent_ == NULL) {
       agent_ = new DebuggerAgent(name, port);
       agent_->Start();
diff --git a/deps/v8/src/debug.h b/deps/v8/src/debug.h
index a39d8013e..582aadae8 100644
--- a/deps/v8/src/debug.h
+++ b/deps/v8/src/debug.h
@@ -178,7 +178,9 @@ class ScriptCache : private HashMap {
 
  private:
   // Calculate the hash value from the key (script id).
-  static uint32_t Hash(int key) { return ComputeIntegerHash(key); }
+  static uint32_t Hash(int key) {
+    return ComputeIntegerHash(key, v8::internal::kZeroHashSeed);
+  }
 
   // Scripts match if their keys (script id) match.
   static bool ScriptMatch(void* key1, void* key2) { return key1 == key2; }
@@ -222,7 +224,7 @@ class DebugInfoListNode {
 // DebugInfo.
 class Debug {
  public:
-  void Setup(bool create_heap_objects);
+  void SetUp(bool create_heap_objects);
   bool Load();
   void Unload();
   bool IsLoaded() { return !debug_context_.is_null(); }
diff --git a/deps/v8/src/elements.cc b/deps/v8/src/elements.cc
index fd2b6d248..e54ec6269 100644
--- a/deps/v8/src/elements.cc
+++ b/deps/v8/src/elements.cc
@@ -549,11 +549,11 @@ class PixelElementsAccessor
 
 class DictionaryElementsAccessor
     : public ElementsAccessorBase<DictionaryElementsAccessor,
-                                  NumberDictionary> {
+                                  SeededNumberDictionary> {
  public:
   // Adjusts the length of the dictionary backing store and returns the new
   // length according to ES5 section 15.4.5.2 behavior.
-  static MaybeObject* SetLengthWithoutNormalize(NumberDictionary* dict,
+  static MaybeObject* SetLengthWithoutNormalize(SeededNumberDictionary* dict,
                                                 JSArray* array,
                                                 Object* length_object,
                                                 uint32_t length) {
@@ -619,9 +619,10 @@ class DictionaryElementsAccessor
     if (is_arguments) {
       backing_store = FixedArray::cast(backing_store->get(1));
     }
-    NumberDictionary* dictionary = NumberDictionary::cast(backing_store);
+    SeededNumberDictionary* dictionary =
+        SeededNumberDictionary::cast(backing_store);
     int entry = dictionary->FindEntry(key);
-    if (entry != NumberDictionary::kNotFound) {
+    if (entry != SeededNumberDictionary::kNotFound) {
       Object* result = dictionary->DeleteProperty(entry, mode);
       if (result == heap->true_value()) {
         MaybeObject* maybe_elements = dictionary->Shrink(key);
@@ -654,7 +655,7 @@ class DictionaryElementsAccessor
 
  protected:
   friend class ElementsAccessorBase<DictionaryElementsAccessor,
-                                    NumberDictionary>;
+                                    SeededNumberDictionary>;
 
   virtual MaybeObject* Delete(JSObject* obj,
                               uint32_t key,
@@ -662,12 +663,12 @@ class DictionaryElementsAccessor
     return DeleteCommon(obj, key, mode);
   }
 
-  static MaybeObject* Get(NumberDictionary* backing_store,
+  static MaybeObject* Get(SeededNumberDictionary* backing_store,
                           uint32_t key,
                           JSObject* obj,
                           Object* receiver) {
     int entry = backing_store->FindEntry(key);
-    if (entry != NumberDictionary::kNotFound) {
+    if (entry != SeededNumberDictionary::kNotFound) {
       Object* element = backing_store->ValueAt(entry);
       PropertyDetails details = backing_store->DetailsAt(entry);
       if (details.type() == CALLBACKS) {
@@ -682,7 +683,7 @@ class DictionaryElementsAccessor
     return obj->GetHeap()->the_hole_value();
   }
 
-  static uint32_t GetKeyForIndex(NumberDictionary* dict,
+  static uint32_t GetKeyForIndex(SeededNumberDictionary* dict,
                                  uint32_t index) {
     Object* key = dict->KeyAt(index);
     return Smi::cast(key)->value();
@@ -895,7 +896,7 @@ MaybeObject* ElementsAccessorBase<ElementsAccessorSubclass, BackingStoreClass>::
   if (length->IsNumber()) {
     uint32_t value;
     if (length->ToArrayIndex(&value)) {
-      NumberDictionary* dictionary;
+      SeededNumberDictionary* dictionary;
       MaybeObject* maybe_object = array->NormalizeElements();
       if (!maybe_object->To(&dictionary)) return maybe_object;
       Object* new_length;
diff --git a/deps/v8/src/execution.cc b/deps/v8/src/execution.cc
index b16e7396a..125241cee 100644
--- a/deps/v8/src/execution.cc
+++ b/deps/v8/src/execution.cc
@@ -845,13 +845,13 @@ Object* Execution::DebugBreakHelper() {
   // Clear the debug break request flag.
   isolate->stack_guard()->Continue(DEBUGBREAK);
 
-  ProcessDebugMesssages(debug_command_only);
+  ProcessDebugMessages(debug_command_only);
 
   // Return to continue execution.
   return isolate->heap()->undefined_value();
 }
 
-void Execution::ProcessDebugMesssages(bool debug_command_only) {
+void Execution::ProcessDebugMessages(bool debug_command_only) {
   Isolate* isolate = Isolate::Current();
   // Clear the debug command request flag.
   isolate->stack_guard()->Continue(DEBUGCOMMAND);
diff --git a/deps/v8/src/execution.h b/deps/v8/src/execution.h
index f2d17d079..014736ee8 100644
--- a/deps/v8/src/execution.h
+++ b/deps/v8/src/execution.h
@@ -136,7 +136,7 @@ class Execution : public AllStatic {
                                           Handle<Object> is_global);
 #ifdef ENABLE_DEBUGGER_SUPPORT
   static Object* DebugBreakHelper();
-  static void ProcessDebugMesssages(bool debug_command_only);
+  static void ProcessDebugMessages(bool debug_command_only);
 #endif
 
   // If the stack guard is triggered, but it is not an actual
diff --git a/deps/v8/src/factory.cc b/deps/v8/src/factory.cc
index c2976a577..0b796350d 100644
--- a/deps/v8/src/factory.cc
+++ b/deps/v8/src/factory.cc
@@ -77,11 +77,21 @@ Handle<StringDictionary> Factory::NewStringDictionary(int at_least_space_for) {
 }
 
 
-Handle<NumberDictionary> Factory::NewNumberDictionary(int at_least_space_for) {
+Handle<SeededNumberDictionary> Factory::NewSeededNumberDictionary(
+    int at_least_space_for) {
   ASSERT(0 <= at_least_space_for);
   CALL_HEAP_FUNCTION(isolate(),
-                     NumberDictionary::Allocate(at_least_space_for),
-                     NumberDictionary);
+                     SeededNumberDictionary::Allocate(at_least_space_for),
+                     SeededNumberDictionary);
+}
+
+
+Handle<UnseededNumberDictionary> Factory::NewUnseededNumberDictionary(
+    int at_least_space_for) {
+  ASSERT(0 <= at_least_space_for);
+  CALL_HEAP_FUNCTION(isolate(),
+                     UnseededNumberDictionary::Allocate(at_least_space_for),
+                     UnseededNumberDictionary);
 }
 
 
@@ -131,6 +141,13 @@ Handle<DeoptimizationOutputData> Factory::NewDeoptimizationOutputData(
 }
 
 
+Handle<AccessorPair> Factory::NewAccessorPair() {
+  CALL_HEAP_FUNCTION(isolate(),
+                     isolate()->heap()->AllocateAccessorPair(),
+                     AccessorPair);
+}
+
+
 // Symbols are created in the old generation (data space).
 Handle<String> Factory::LookupSymbol(Vector<const char> string) {
   CALL_HEAP_FUNCTION(isolate(),
@@ -698,7 +715,7 @@ Handle<JSFunction> Factory::NewFunction(Handle<String> name,
   // Allocate the function
   Handle<JSFunction> function = NewFunction(name, the_hole_value());
 
-  // Setup the code pointer in both the shared function info and in
+  // Set up the code pointer in both the shared function info and in
   // the function itself.
   function->shared()->set_code(*code);
   function->set_code(*code);
@@ -729,7 +746,7 @@ Handle<JSFunction> Factory::NewFunctionWithPrototype(Handle<String> name,
   // Allocate the function.
   Handle<JSFunction> function = NewFunction(name, prototype);
 
-  // Setup the code pointer in both the shared function info and in
+  // Set up the code pointer in both the shared function info and in
   // the function itself.
   function->shared()->set_code(*code);
   function->set_code(*code);
@@ -751,7 +768,10 @@ Handle<JSFunction> Factory::NewFunctionWithPrototype(Handle<String> name,
   // property that refers to the function.
   SetPrototypeProperty(function, prototype);
   // Currently safe because it is only invoked from Genesis.
-  SetLocalPropertyNoThrow(prototype, constructor_symbol(), function, DONT_ENUM);
+  CHECK_NOT_EMPTY_HANDLE(isolate(),
+                         JSObject::SetLocalPropertyIgnoreAttributes(
+                             prototype, constructor_symbol(),
+                             function, DONT_ENUM));
   return function;
 }
 
@@ -1061,13 +1081,23 @@ Handle<String> Factory::Uint32ToString(uint32_t value) {
 }
 
 
-Handle<NumberDictionary> Factory::DictionaryAtNumberPut(
-    Handle<NumberDictionary> dictionary,
+Handle<SeededNumberDictionary> Factory::DictionaryAtNumberPut(
+    Handle<SeededNumberDictionary> dictionary,
+    uint32_t key,
+    Handle<Object> value) {
+  CALL_HEAP_FUNCTION(isolate(),
+                     dictionary->AtNumberPut(key, *value),
+                     SeededNumberDictionary);
+}
+
+
+Handle<UnseededNumberDictionary> Factory::DictionaryAtNumberPut(
+    Handle<UnseededNumberDictionary> dictionary,
     uint32_t key,
     Handle<Object> value) {
   CALL_HEAP_FUNCTION(isolate(),
                      dictionary->AtNumberPut(key, *value),
-                     NumberDictionary);
+                     UnseededNumberDictionary);
 }
 
 
diff --git a/deps/v8/src/factory.h b/deps/v8/src/factory.h
index e9a43fd4f..8725b67ec 100644
--- a/deps/v8/src/factory.h
+++ b/deps/v8/src/factory.h
@@ -54,7 +54,11 @@ class Factory {
       int size,
       PretenureFlag pretenure = NOT_TENURED);
 
-  Handle<NumberDictionary> NewNumberDictionary(int at_least_space_for);
+  Handle<SeededNumberDictionary> NewSeededNumberDictionary(
+      int at_least_space_for);
+
+  Handle<UnseededNumberDictionary> NewUnseededNumberDictionary(
+      int at_least_space_for);
 
   Handle<StringDictionary> NewStringDictionary(int at_least_space_for);
 
@@ -69,6 +73,8 @@ class Factory {
   Handle<DeoptimizationOutputData> NewDeoptimizationOutputData(
       int deopt_entry_count,
       PretenureFlag pretenure);
+  // Allocates a pre-tenured empty AccessorPair.
+  Handle<AccessorPair> NewAccessorPair();
 
   Handle<String> LookupSymbol(Vector<const char> str);
   Handle<String> LookupSymbol(Handle<String> str);
@@ -430,8 +436,13 @@ class Factory {
       Handle<Object> stack_trace,
       Handle<Object> stack_frames);
 
-  Handle<NumberDictionary> DictionaryAtNumberPut(
-      Handle<NumberDictionary>,
+  Handle<SeededNumberDictionary> DictionaryAtNumberPut(
+      Handle<SeededNumberDictionary>,
+      uint32_t key,
+      Handle<Object> value);
+
+  Handle<UnseededNumberDictionary> DictionaryAtNumberPut(
+      Handle<UnseededNumberDictionary>,
       uint32_t key,
       Handle<Object> value);
 
diff --git a/deps/v8/src/flag-definitions.h b/deps/v8/src/flag-definitions.h
index 07060dcb0..9284e1369 100644
--- a/deps/v8/src/flag-definitions.h
+++ b/deps/v8/src/flag-definitions.h
@@ -349,13 +349,13 @@ DEFINE_bool(trace_exception, false,
             "print stack trace when throwing exceptions")
 DEFINE_bool(preallocate_message_memory, false,
             "preallocate some memory to build stack traces.")
-DEFINE_bool(randomize_string_hashes,
+DEFINE_bool(randomize_hashes,
             true,
-            "randomize string hashes to avoid predictable hash collisions "
+            "randomize hashes to avoid predictable hash collisions "
             "(with snapshots this option cannot override the baked-in seed)")
-DEFINE_int(string_hash_seed,
+DEFINE_int(hash_seed,
            0,
-           "Fixed seed to use to string hashing (0 means random)"
+           "Fixed seed to use to hash property keys (0 means random)"
            "(with snapshots this option cannot override the baked-in seed)")
 
 // v8.cc
diff --git a/deps/v8/src/frames.cc b/deps/v8/src/frames.cc
index e3ed2de4e..3a46e0869 100644
--- a/deps/v8/src/frames.cc
+++ b/deps/v8/src/frames.cc
@@ -485,7 +485,7 @@ Code* ExitFrame::unchecked_code() const {
 
 
 void ExitFrame::ComputeCallerState(State* state) const {
-  // Setup the caller state.
+  // Set up the caller state.
   state->sp = caller_sp();
   state->fp = Memory::Address_at(fp() + ExitFrameConstants::kCallerFPOffset);
   state->pc_address
@@ -1303,7 +1303,8 @@ InnerPointerToCodeCache::InnerPointerToCodeCacheEntry*
   isolate_->counters()->pc_to_code()->Increment();
   ASSERT(IsPowerOf2(kInnerPointerToCodeCacheSize));
   uint32_t hash = ComputeIntegerHash(
-      static_cast<uint32_t>(reinterpret_cast<uintptr_t>(inner_pointer)));
+      static_cast<uint32_t>(reinterpret_cast<uintptr_t>(inner_pointer)),
+      v8::internal::kZeroHashSeed);
   uint32_t index = hash & (kInnerPointerToCodeCacheSize - 1);
   InnerPointerToCodeCacheEntry* entry = cache(index);
   if (entry->inner_pointer == inner_pointer) {
diff --git a/deps/v8/src/full-codegen.cc b/deps/v8/src/full-codegen.cc
index 04086d483..5c7a23d54 100644
--- a/deps/v8/src/full-codegen.cc
+++ b/deps/v8/src/full-codegen.cc
@@ -1178,7 +1178,7 @@ void FullCodeGenerator::VisitTryFinallyStatement(TryFinallyStatement* stmt) {
   }
   ExitFinallyBlock();  // Return to the calling code.
 
-  // Setup try handler.
+  // Set up try handler.
   __ bind(&try_entry);
   __ PushTryHandler(IN_JAVASCRIPT, TRY_FINALLY_HANDLER, stmt->index());
   { TryFinally try_body(this, &finally_entry);
@@ -1284,7 +1284,7 @@ FullCodeGenerator::NestedStatement* FullCodeGenerator::TryCatch::Exit(
 
 
 bool FullCodeGenerator::TryLiteralCompare(CompareOperation* expr) {
-  Expression *sub_expr;
+  Expression* sub_expr;
   Handle<String> check;
   if (expr->IsLiteralCompareTypeof(&sub_expr, &check)) {
     EmitLiteralCompareTypeof(expr, sub_expr, check);
diff --git a/deps/v8/src/gdb-jit.cc b/deps/v8/src/gdb-jit.cc
index b386bed17..4192222f9 100644
--- a/deps/v8/src/gdb-jit.cc
+++ b/deps/v8/src/gdb-jit.cc
@@ -1556,23 +1556,23 @@ class DebugLineSection : public DebugSection {
 
 class UnwindInfoSection : public DebugSection {
  public:
-  explicit UnwindInfoSection(CodeDescription *desc);
-  virtual bool WriteBody(Writer *w);
+  explicit UnwindInfoSection(CodeDescription* desc);
+  virtual bool WriteBody(Writer* w);
 
-  int WriteCIE(Writer *w);
-  void WriteFDE(Writer *w, int);
+  int WriteCIE(Writer* w);
+  void WriteFDE(Writer* w, int);
 
-  void WriteFDEStateOnEntry(Writer *w);
-  void WriteFDEStateAfterRBPPush(Writer *w);
-  void WriteFDEStateAfterRBPSet(Writer *w);
-  void WriteFDEStateAfterRBPPop(Writer *w);
+  void WriteFDEStateOnEntry(Writer* w);
+  void WriteFDEStateAfterRBPPush(Writer* w);
+  void WriteFDEStateAfterRBPSet(Writer* w);
+  void WriteFDEStateAfterRBPPop(Writer* w);
 
-  void WriteLength(Writer *w,
+  void WriteLength(Writer* w,
                    Writer::Slot<uint32_t>* length_slot,
                    int initial_position);
 
  private:
-  CodeDescription *desc_;
+  CodeDescription* desc_;
 
   // DWARF3 Specification, Table 7.23
   enum CFIInstructions {
@@ -1623,7 +1623,7 @@ class UnwindInfoSection : public DebugSection {
 };
 
 
-void UnwindInfoSection::WriteLength(Writer *w,
+void UnwindInfoSection::WriteLength(Writer* w,
                                     Writer::Slot<uint32_t>* length_slot,
                                     int initial_position) {
   uint32_t align = (w->position() - initial_position) % kPointerSize;
@@ -1639,7 +1639,7 @@ void UnwindInfoSection::WriteLength(Writer *w,
 }
 
 
-UnwindInfoSection::UnwindInfoSection(CodeDescription *desc)
+UnwindInfoSection::UnwindInfoSection(CodeDescription* desc)
 #ifdef __ELF
     : ELFSection(".eh_frame", TYPE_X86_64_UNWIND, 1),
 #else
@@ -1648,7 +1648,7 @@ UnwindInfoSection::UnwindInfoSection(CodeDescription *desc)
 #endif
       desc_(desc) { }
 
-int UnwindInfoSection::WriteCIE(Writer *w) {
+int UnwindInfoSection::WriteCIE(Writer* w) {
   Writer::Slot<uint32_t> cie_length_slot = w->CreateSlotHere<uint32_t>();
   uint32_t cie_position = w->position();
 
@@ -1668,7 +1668,7 @@ int UnwindInfoSection::WriteCIE(Writer *w) {
 }
 
 
-void UnwindInfoSection::WriteFDE(Writer *w, int cie_position) {
+void UnwindInfoSection::WriteFDE(Writer* w, int cie_position) {
   // The only FDE for this function. The CFA is the current RBP.
   Writer::Slot<uint32_t> fde_length_slot = w->CreateSlotHere<uint32_t>();
   int fde_position = w->position();
@@ -1686,7 +1686,7 @@ void UnwindInfoSection::WriteFDE(Writer *w, int cie_position) {
 }
 
 
-void UnwindInfoSection::WriteFDEStateOnEntry(Writer *w) {
+void UnwindInfoSection::WriteFDEStateOnEntry(Writer* w) {
   // The first state, just after the control has been transferred to the the
   // function.
 
@@ -1713,7 +1713,7 @@ void UnwindInfoSection::WriteFDEStateOnEntry(Writer *w) {
 }
 
 
-void UnwindInfoSection::WriteFDEStateAfterRBPPush(Writer *w) {
+void UnwindInfoSection::WriteFDEStateAfterRBPPush(Writer* w) {
   // The second state, just after RBP has been pushed.
 
   // RBP / CFA for this function is now the current RSP, so just set the
@@ -1734,7 +1734,7 @@ void UnwindInfoSection::WriteFDEStateAfterRBPPush(Writer *w) {
 }
 
 
-void UnwindInfoSection::WriteFDEStateAfterRBPSet(Writer *w) {
+void UnwindInfoSection::WriteFDEStateAfterRBPSet(Writer* w) {
   // The third state, after the RBP has been set.
 
   // The CFA can now directly be set to RBP.
@@ -1749,7 +1749,7 @@ void UnwindInfoSection::WriteFDEStateAfterRBPSet(Writer *w) {
 }
 
 
-void UnwindInfoSection::WriteFDEStateAfterRBPPop(Writer *w) {
+void UnwindInfoSection::WriteFDEStateAfterRBPPop(Writer* w) {
   // The fourth (final) state. The RBP has been popped (just before issuing a
   // return).
 
@@ -1769,7 +1769,7 @@ void UnwindInfoSection::WriteFDEStateAfterRBPPop(Writer *w) {
 }
 
 
-bool UnwindInfoSection::WriteBody(Writer *w) {
+bool UnwindInfoSection::WriteBody(Writer* w) {
   uint32_t cie_position = WriteCIE(w);
   WriteFDE(w, cie_position);
   return true;
@@ -1810,8 +1810,8 @@ extern "C" {
   struct JITDescriptor {
     uint32_t version_;
     uint32_t action_flag_;
-    JITCodeEntry *relevant_entry_;
-    JITCodeEntry *first_entry_;
+    JITCodeEntry* relevant_entry_;
+    JITCodeEntry* first_entry_;
   };
 
   // GDB will place breakpoint into this function.
@@ -1998,7 +1998,7 @@ void GDBJITInterface::AddCode(Handle<String> name,
   }
 }
 
-static void AddUnwindInfo(CodeDescription *desc) {
+static void AddUnwindInfo(CodeDescription* desc) {
 #ifdef V8_TARGET_ARCH_X64
   if (desc->tag() == GDBJITInterface::FUNCTION) {
     // To avoid propagating unwinding information through
diff --git a/deps/v8/src/handles.cc b/deps/v8/src/handles.cc
index 2ff797d07..34eaddbbd 100644
--- a/deps/v8/src/handles.cc
+++ b/deps/v8/src/handles.cc
@@ -208,42 +208,6 @@ void SetExpectedNofPropertiesFromEstimate(Handle<SharedFunctionInfo> shared,
 }
 
 
-void NormalizeProperties(Handle<JSObject> object,
-                         PropertyNormalizationMode mode,
-                         int expected_additional_properties) {
-  CALL_HEAP_FUNCTION_VOID(object->GetIsolate(),
-                          object->NormalizeProperties(
-                              mode,
-                              expected_additional_properties));
-}
-
-
-Handle<NumberDictionary> NormalizeElements(Handle<JSObject> object) {
-  CALL_HEAP_FUNCTION(object->GetIsolate(),
-                     object->NormalizeElements(),
-                     NumberDictionary);
-}
-
-
-void TransformToFastProperties(Handle<JSObject> object,
-                               int unused_property_fields) {
-  CALL_HEAP_FUNCTION_VOID(
-      object->GetIsolate(),
-      object->TransformToFastProperties(unused_property_fields));
-}
-
-
-Handle<NumberDictionary> NumberDictionarySet(
-    Handle<NumberDictionary> dictionary,
-    uint32_t index,
-    Handle<Object> value,
-    PropertyDetails details) {
-  CALL_HEAP_FUNCTION(dictionary->GetIsolate(),
-                     dictionary->Set(index, *value, details),
-                     NumberDictionary);
-}
-
-
 void FlattenString(Handle<String> string) {
   CALL_HEAP_FUNCTION_VOID(string->GetIsolate(), string->TryFlatten());
 }
@@ -265,17 +229,6 @@ Handle<Object> SetPrototype(Handle<JSFunction> function,
 }
 
 
-Handle<Object> SetProperty(Handle<JSReceiver> object,
-                           Handle<String> key,
-                           Handle<Object> value,
-                           PropertyAttributes attributes,
-                           StrictModeFlag strict_mode) {
-  CALL_HEAP_FUNCTION(object->GetIsolate(),
-                     object->SetProperty(*key, *value, attributes, strict_mode),
-                     Object);
-}
-
-
 Handle<Object> SetProperty(Handle<Object> object,
                            Handle<Object> key,
                            Handle<Object> value,
@@ -303,16 +256,6 @@ Handle<Object> ForceSetProperty(Handle<JSObject> object,
 }
 
 
-Handle<Object> SetNormalizedProperty(Handle<JSObject> object,
-                                     Handle<String> key,
-                                     Handle<Object> value,
-                                     PropertyDetails details) {
-  CALL_HEAP_FUNCTION(object->GetIsolate(),
-                     object->SetNormalizedProperty(*key, *value, details),
-                     Object);
-}
-
-
 Handle<Object> ForceDeleteProperty(Handle<JSObject> object,
                                    Handle<Object> key) {
   Isolate* isolate = object->GetIsolate();
@@ -322,30 +265,6 @@ Handle<Object> ForceDeleteProperty(Handle<JSObject> object,
 }
 
 
-Handle<Object> SetLocalPropertyIgnoreAttributes(
-    Handle<JSObject> object,
-    Handle<String> key,
-    Handle<Object> value,
-    PropertyAttributes attributes) {
-  CALL_HEAP_FUNCTION(
-    object->GetIsolate(),
-    object->SetLocalPropertyIgnoreAttributes(*key, *value, attributes),
-    Object);
-}
-
-
-void SetLocalPropertyNoThrow(Handle<JSObject> object,
-                             Handle<String> key,
-                             Handle<Object> value,
-                             PropertyAttributes attributes) {
-  Isolate* isolate = object->GetIsolate();
-  ASSERT(!isolate->has_pending_exception());
-  CHECK(!SetLocalPropertyIgnoreAttributes(
-        object, key, value, attributes).is_null());
-  CHECK(!isolate->has_pending_exception());
-}
-
-
 Handle<Object> SetPropertyWithInterceptor(Handle<JSObject> object,
                                           Handle<String> key,
                                           Handle<Object> value,
@@ -389,12 +308,6 @@ Handle<Object> GetPropertyWithInterceptor(Handle<JSObject> receiver,
 }
 
 
-Handle<Object> GetPrototype(Handle<Object> obj) {
-  Handle<Object> result(obj->GetPrototype());
-  return result;
-}
-
-
 Handle<Object> SetPrototype(Handle<JSObject> obj, Handle<Object> value) {
   const bool skip_hidden_prototypes = false;
   CALL_HEAP_FUNCTION(obj->GetIsolate(),
@@ -402,44 +315,6 @@ Handle<Object> SetPrototype(Handle<JSObject> obj, Handle<Object> value) {
 }
 
 
-Handle<Object> PreventExtensions(Handle<JSObject> object) {
-  CALL_HEAP_FUNCTION(object->GetIsolate(), object->PreventExtensions(), Object);
-}
-
-
-Handle<Object> SetHiddenProperty(Handle<JSObject> obj,
-                                 Handle<String> key,
-                                 Handle<Object> value) {
-  CALL_HEAP_FUNCTION(obj->GetIsolate(),
-                     obj->SetHiddenProperty(*key, *value),
-                     Object);
-}
-
-
-int GetIdentityHash(Handle<JSReceiver> obj) {
-  CALL_AND_RETRY(obj->GetIsolate(),
-                 obj->GetIdentityHash(ALLOW_CREATION),
-                 return Smi::cast(__object__)->value(),
-                 return 0);
-}
-
-
-Handle<Object> DeleteElement(Handle<JSObject> obj,
-                             uint32_t index) {
-  CALL_HEAP_FUNCTION(obj->GetIsolate(),
-                     obj->DeleteElement(index, JSObject::NORMAL_DELETION),
-                     Object);
-}
-
-
-Handle<Object> DeleteProperty(Handle<JSObject> obj,
-                              Handle<String> prop) {
-  CALL_HEAP_FUNCTION(obj->GetIsolate(),
-                     obj->DeleteProperty(*prop, JSObject::NORMAL_DELETION),
-                     Object);
-}
-
-
 Handle<Object> LookupSingleCharacterStringFromCode(uint32_t index) {
   Isolate* isolate = Isolate::Current();
   CALL_HEAP_FUNCTION(
@@ -457,43 +332,6 @@ Handle<String> SubString(Handle<String> str,
 }
 
 
-Handle<Object> SetElement(Handle<JSObject> object,
-                          uint32_t index,
-                          Handle<Object> value,
-                          StrictModeFlag strict_mode) {
-  if (object->HasExternalArrayElements()) {
-    if (!value->IsSmi() && !value->IsHeapNumber() && !value->IsUndefined()) {
-      bool has_exception;
-      Handle<Object> number = Execution::ToNumber(value, &has_exception);
-      if (has_exception) return Handle<Object>();
-      value = number;
-    }
-  }
-  CALL_HEAP_FUNCTION(object->GetIsolate(),
-                     object->SetElement(index, *value, strict_mode, true),
-                     Object);
-}
-
-
-Handle<Object> SetOwnElement(Handle<JSObject> object,
-                             uint32_t index,
-                             Handle<Object> value,
-                             StrictModeFlag strict_mode) {
-  ASSERT(!object->HasExternalArrayElements());
-  CALL_HEAP_FUNCTION(object->GetIsolate(),
-                     object->SetElement(index, *value, strict_mode, false),
-                     Object);
-}
-
-
-Handle<Object> TransitionElementsKind(Handle<JSObject> object,
-                                      ElementsKind to_kind) {
-  CALL_HEAP_FUNCTION(object->GetIsolate(),
-                     object->TransitionElementsKind(to_kind),
-                     Object);
-}
-
-
 Handle<JSObject> Copy(Handle<JSObject> obj) {
   Isolate* isolate = obj->GetIsolate();
   CALL_HEAP_FUNCTION(isolate,
diff --git a/deps/v8/src/handles.h b/deps/v8/src/handles.h
index cfa65b378..42089134e 100644
--- a/deps/v8/src/handles.h
+++ b/deps/v8/src/handles.h
@@ -167,18 +167,6 @@ class HandleScope {
 // an object of expected type, or the handle is an error if running out
 // of space or encountering an internal error.
 
-void NormalizeProperties(Handle<JSObject> object,
-                         PropertyNormalizationMode mode,
-                         int expected_additional_properties);
-Handle<NumberDictionary> NormalizeElements(Handle<JSObject> object);
-void TransformToFastProperties(Handle<JSObject> object,
-                               int unused_property_fields);
-MUST_USE_RESULT Handle<NumberDictionary> NumberDictionarySet(
-    Handle<NumberDictionary> dictionary,
-    uint32_t index,
-    Handle<Object> value,
-    PropertyDetails details);
-
 // Flattens a string.
 void FlattenString(Handle<String> str);
 
@@ -186,12 +174,6 @@ void FlattenString(Handle<String> str);
 // string.
 Handle<String> FlattenGetString(Handle<String> str);
 
-Handle<Object> SetProperty(Handle<JSReceiver> object,
-                           Handle<String> key,
-                           Handle<Object> value,
-                           PropertyAttributes attributes,
-                           StrictModeFlag strict_mode);
-
 Handle<Object> SetProperty(Handle<Object> object,
                            Handle<Object> key,
                            Handle<Object> value,
@@ -203,40 +185,9 @@ Handle<Object> ForceSetProperty(Handle<JSObject> object,
                                 Handle<Object> value,
                                 PropertyAttributes attributes);
 
-Handle<Object> SetNormalizedProperty(Handle<JSObject> object,
-                                     Handle<String> key,
-                                     Handle<Object> value,
-                                     PropertyDetails details);
-
 Handle<Object> ForceDeleteProperty(Handle<JSObject> object,
                                    Handle<Object> key);
 
-Handle<Object> SetLocalPropertyIgnoreAttributes(
-    Handle<JSObject> object,
-    Handle<String> key,
-    Handle<Object> value,
-    PropertyAttributes attributes);
-
-// Used to set local properties on the object we totally control
-// and which therefore has no accessors and alikes.
-void SetLocalPropertyNoThrow(Handle<JSObject> object,
-                             Handle<String> key,
-                             Handle<Object> value,
-                             PropertyAttributes attributes = NONE);
-
-MUST_USE_RESULT Handle<Object> SetElement(Handle<JSObject> object,
-                                          uint32_t index,
-                                          Handle<Object> value,
-                                          StrictModeFlag strict_mode);
-
-Handle<Object> SetOwnElement(Handle<JSObject> object,
-                             uint32_t index,
-                             Handle<Object> value,
-                             StrictModeFlag strict_mode);
-
-Handle<Object> TransitionElementsKind(Handle<JSObject> object,
-                                      ElementsKind to_kind);
-
 Handle<Object> GetProperty(Handle<JSReceiver> obj,
                            const char* name);
 
@@ -248,21 +199,8 @@ Handle<Object> GetPropertyWithInterceptor(Handle<JSObject> receiver,
                                           Handle<String> name,
                                           PropertyAttributes* attributes);
 
-Handle<Object> GetPrototype(Handle<Object> obj);
-
 Handle<Object> SetPrototype(Handle<JSObject> obj, Handle<Object> value);
 
-// Sets a hidden property on an object. Returns obj on success, undefined
-// if trying to set the property on a detached proxy.
-Handle<Object> SetHiddenProperty(Handle<JSObject> obj,
-                                 Handle<String> key,
-                                 Handle<Object> value);
-
-int GetIdentityHash(Handle<JSReceiver> obj);
-
-Handle<Object> DeleteElement(Handle<JSObject> obj, uint32_t index);
-Handle<Object> DeleteProperty(Handle<JSObject> obj, Handle<String> prop);
-
 Handle<Object> LookupSingleCharacterStringFromCode(uint32_t index);
 
 Handle<JSObject> Copy(Handle<JSObject> obj);
@@ -316,7 +254,6 @@ Handle<String> SubString(Handle<String> str,
                          int end,
                          PretenureFlag pretenure = NOT_TENURED);
 
-
 // Sets the expected number of properties for the function's instances.
 void SetExpectedNofProperties(Handle<JSFunction> func, int nof);
 
@@ -335,8 +272,6 @@ Handle<JSGlobalProxy> ReinitializeJSGlobalProxy(
 Handle<Object> SetPrototype(Handle<JSFunction> function,
                             Handle<Object> prototype);
 
-Handle<Object> PreventExtensions(Handle<JSObject> object);
-
 Handle<ObjectHashSet> ObjectHashSetAdd(Handle<ObjectHashSet> table,
                                        Handle<Object> key);
 
diff --git a/deps/v8/src/heap-inl.h b/deps/v8/src/heap-inl.h
index ef6e58ed0..4d98fbad1 100644
--- a/deps/v8/src/heap-inl.h
+++ b/deps/v8/src/heap-inl.h
@@ -463,7 +463,7 @@ MaybeObject* Heap::PrepareForCompare(String* str) {
 
 
 int Heap::AdjustAmountOfExternalAllocatedMemory(int change_in_bytes) {
-  ASSERT(HasBeenSetup());
+  ASSERT(HasBeenSetUp());
   int amount = amount_of_external_allocated_memory_ + change_in_bytes;
   if (change_in_bytes >= 0) {
     // Avoid overflow.
diff --git a/deps/v8/src/heap-profiler.cc b/deps/v8/src/heap-profiler.cc
index 46c63c27c..8be6f2768 100644
--- a/deps/v8/src/heap-profiler.cc
+++ b/deps/v8/src/heap-profiler.cc
@@ -51,7 +51,7 @@ void HeapProfiler::ResetSnapshots() {
 }
 
 
-void HeapProfiler::Setup() {
+void HeapProfiler::SetUp() {
   Isolate* isolate = Isolate::Current();
   if (isolate->heap_profiler() == NULL) {
     isolate->set_heap_profiler(new HeapProfiler());
diff --git a/deps/v8/src/heap-profiler.h b/deps/v8/src/heap-profiler.h
index b1bc91c30..ef5c4f4b4 100644
--- a/deps/v8/src/heap-profiler.h
+++ b/deps/v8/src/heap-profiler.h
@@ -48,7 +48,7 @@ class HeapSnapshotsCollection;
 // to generate .hp files for use by the GHC/Valgrind tool hp2ps.
 class HeapProfiler {
  public:
-  static void Setup();
+  static void SetUp();
   static void TearDown();
 
   static HeapSnapshot* TakeSnapshot(const char* name,
diff --git a/deps/v8/src/heap.cc b/deps/v8/src/heap.cc
index 31cd889cb..3c871e270 100644
--- a/deps/v8/src/heap.cc
+++ b/deps/v8/src/heap.cc
@@ -176,7 +176,7 @@ Heap::Heap()
 
 
 intptr_t Heap::Capacity() {
-  if (!HasBeenSetup()) return 0;
+  if (!HasBeenSetUp()) return 0;
 
   return new_space_.Capacity() +
       old_pointer_space_->Capacity() +
@@ -188,7 +188,7 @@ intptr_t Heap::Capacity() {
 
 
 intptr_t Heap::CommittedMemory() {
-  if (!HasBeenSetup()) return 0;
+  if (!HasBeenSetUp()) return 0;
 
   return new_space_.CommittedMemory() +
       old_pointer_space_->CommittedMemory() +
@@ -200,14 +200,14 @@ intptr_t Heap::CommittedMemory() {
 }
 
 intptr_t Heap::CommittedMemoryExecutable() {
-  if (!HasBeenSetup()) return 0;
+  if (!HasBeenSetUp()) return 0;
 
   return isolate()->memory_allocator()->SizeExecutable();
 }
 
 
 intptr_t Heap::Available() {
-  if (!HasBeenSetup()) return 0;
+  if (!HasBeenSetUp()) return 0;
 
   return new_space_.Available() +
       old_pointer_space_->Available() +
@@ -218,7 +218,7 @@ intptr_t Heap::Available() {
 }
 
 
-bool Heap::HasBeenSetup() {
+bool Heap::HasBeenSetUp() {
   return old_pointer_space_ != NULL &&
          old_data_space_ != NULL &&
          code_space_ != NULL &&
@@ -1354,6 +1354,28 @@ void Heap::ProcessWeakReferences(WeakObjectRetainer* retainer) {
 }
 
 
+void Heap::VisitExternalResources(v8::ExternalResourceVisitor* visitor) {
+  AssertNoAllocation no_allocation;
+
+  class VisitorAdapter : public ObjectVisitor {
+   public:
+    explicit VisitorAdapter(v8::ExternalResourceVisitor* visitor)
+        : visitor_(visitor) {}
+    virtual void VisitPointers(Object** start, Object** end) {
+      for (Object** p = start; p < end; p++) {
+        if ((*p)->IsExternalString()) {
+          visitor_->VisitExternalString(Utils::ToLocal(
+              Handle<String>(String::cast(*p))));
+        }
+      }
+    }
+   private:
+    v8::ExternalResourceVisitor* visitor_;
+  } visitor_adapter(visitor);
+  external_string_table_.Iterate(&visitor_adapter);
+}
+
+
 class NewSpaceScavenger : public StaticNewSpaceVisitor<NewSpaceScavenger> {
  public:
   static inline void VisitPointer(Heap* heap, Object** p) {
@@ -1869,6 +1891,19 @@ MaybeObject* Heap::AllocatePolymorphicCodeCache() {
 }
 
 
+MaybeObject* Heap::AllocateAccessorPair() {
+  Object* result;
+  { MaybeObject* maybe_result = AllocateStruct(ACCESSOR_PAIR_TYPE);
+    if (!maybe_result->ToObject(&result)) return maybe_result;
+  }
+  AccessorPair* accessors = AccessorPair::cast(result);
+  // Later we will have to distinguish between undefined and the hole...
+  // accessors->set_getter(the_hole_value(), SKIP_WRITE_BARRIER);
+  // accessors->set_setter(the_hole_value(), SKIP_WRITE_BARRIER);
+  return accessors;
+}
+
+
 const Heap::StringTypeTable Heap::string_type_table[] = {
 #define STRING_TYPE_ELEMENT(type, size, name, camel_name)                      \
   {type, size, k##camel_name##MapRootIndex},
@@ -2428,18 +2463,18 @@ bool Heap::CreateInitialObjects() {
 
   // Allocate the code_stubs dictionary. The initial size is set to avoid
   // expanding the dictionary during bootstrapping.
-  { MaybeObject* maybe_obj = NumberDictionary::Allocate(128);
+  { MaybeObject* maybe_obj = UnseededNumberDictionary::Allocate(128);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
-  set_code_stubs(NumberDictionary::cast(obj));
+  set_code_stubs(UnseededNumberDictionary::cast(obj));
 
 
   // Allocate the non_monomorphic_cache used in stub-cache.cc. The initial size
   // is set to avoid expanding the dictionary during bootstrapping.
-  { MaybeObject* maybe_obj = NumberDictionary::Allocate(64);
+  { MaybeObject* maybe_obj = UnseededNumberDictionary::Allocate(64);
     if (!maybe_obj->ToObject(&obj)) return false;
   }
-  set_non_monomorphic_cache(NumberDictionary::cast(obj));
+  set_non_monomorphic_cache(UnseededNumberDictionary::cast(obj));
 
   { MaybeObject* maybe_obj = AllocatePolymorphicCodeCache();
     if (!maybe_obj->ToObject(&obj)) return false;
@@ -3794,7 +3829,7 @@ MaybeObject* Heap::AllocateGlobalObject(JSFunction* constructor) {
   }
   Map* new_map = Map::cast(obj);
 
-  // Setup the global object as a normalized object.
+  // Set up the global object as a normalized object.
   global->set_map(new_map);
   global->map()->clear_instance_descriptors();
   global->set_properties(dictionary);
@@ -4727,7 +4762,7 @@ bool Heap::IdleGlobalGC() {
 #ifdef DEBUG
 
 void Heap::Print() {
-  if (!HasBeenSetup()) return;
+  if (!HasBeenSetUp()) return;
   isolate()->PrintStack();
   AllSpaces spaces;
   for (Space* space = spaces.next(); space != NULL; space = spaces.next())
@@ -4792,7 +4827,7 @@ bool Heap::Contains(HeapObject* value) {
 
 bool Heap::Contains(Address addr) {
   if (OS::IsOutsideAllocatedSpace(addr)) return false;
-  return HasBeenSetup() &&
+  return HasBeenSetUp() &&
     (new_space_.ToSpaceContains(addr) ||
      old_pointer_space_->Contains(addr) ||
      old_data_space_->Contains(addr) ||
@@ -4810,7 +4845,7 @@ bool Heap::InSpace(HeapObject* value, AllocationSpace space) {
 
 bool Heap::InSpace(Address addr, AllocationSpace space) {
   if (OS::IsOutsideAllocatedSpace(addr)) return false;
-  if (!HasBeenSetup()) return false;
+  if (!HasBeenSetUp()) return false;
 
   switch (space) {
     case NEW_SPACE:
@@ -4835,7 +4870,7 @@ bool Heap::InSpace(Address addr, AllocationSpace space) {
 
 #ifdef DEBUG
 void Heap::Verify() {
-  ASSERT(HasBeenSetup());
+  ASSERT(HasBeenSetUp());
 
   store_buffer()->Verify();
 
@@ -5262,7 +5297,7 @@ void Heap::IterateStrongRoots(ObjectVisitor* v, VisitMode mode) {
 bool Heap::ConfigureHeap(int max_semispace_size,
                          intptr_t max_old_gen_size,
                          intptr_t max_executable_size) {
-  if (HasBeenSetup()) return false;
+  if (HasBeenSetUp()) return false;
 
   if (max_semispace_size > 0) {
     if (max_semispace_size < Page::kPageSize) {
@@ -5551,7 +5586,7 @@ class HeapDebugUtils {
 
 #endif
 
-bool Heap::Setup(bool create_heap_objects) {
+bool Heap::SetUp(bool create_heap_objects) {
 #ifdef DEBUG
   allocation_timeout_ = FLAG_gc_interval;
   debug_utils_ = new HeapDebugUtils(this);
@@ -5581,12 +5616,12 @@ bool Heap::Setup(bool create_heap_objects) {
 
   MarkMapPointersAsEncoded(false);
 
-  // Setup memory allocator.
-  if (!isolate_->memory_allocator()->Setup(MaxReserved(), MaxExecutableSize()))
+  // Set up memory allocator.
+  if (!isolate_->memory_allocator()->SetUp(MaxReserved(), MaxExecutableSize()))
       return false;
 
-  // Setup new space.
-  if (!new_space_.Setup(reserved_semispace_size_, max_semispace_size_)) {
+  // Set up new space.
+  if (!new_space_.SetUp(reserved_semispace_size_, max_semispace_size_)) {
     return false;
   }
 
@@ -5597,7 +5632,7 @@ bool Heap::Setup(bool create_heap_objects) {
                    OLD_POINTER_SPACE,
                    NOT_EXECUTABLE);
   if (old_pointer_space_ == NULL) return false;
-  if (!old_pointer_space_->Setup()) return false;
+  if (!old_pointer_space_->SetUp()) return false;
 
   // Initialize old data space.
   old_data_space_ =
@@ -5606,14 +5641,14 @@ bool Heap::Setup(bool create_heap_objects) {
                    OLD_DATA_SPACE,
                    NOT_EXECUTABLE);
   if (old_data_space_ == NULL) return false;
-  if (!old_data_space_->Setup()) return false;
+  if (!old_data_space_->SetUp()) return false;
 
   // Initialize the code space, set its maximum capacity to the old
   // generation size. It needs executable memory.
   // On 64-bit platform(s), we put all code objects in a 2 GB range of
   // virtual address space, so that they can call each other with near calls.
   if (code_range_size_ > 0) {
-    if (!isolate_->code_range()->Setup(code_range_size_)) {
+    if (!isolate_->code_range()->SetUp(code_range_size_)) {
       return false;
     }
   }
@@ -5621,7 +5656,7 @@ bool Heap::Setup(bool create_heap_objects) {
   code_space_ =
       new OldSpace(this, max_old_generation_size_, CODE_SPACE, EXECUTABLE);
   if (code_space_ == NULL) return false;
-  if (!code_space_->Setup()) return false;
+  if (!code_space_->SetUp()) return false;
 
   // Initialize map space.
   map_space_ = new MapSpace(this,
@@ -5629,28 +5664,28 @@ bool Heap::Setup(bool create_heap_objects) {
                             FLAG_max_map_space_pages,
                             MAP_SPACE);
   if (map_space_ == NULL) return false;
-  if (!map_space_->Setup()) return false;
+  if (!map_space_->SetUp()) return false;
 
   // Initialize global property cell space.
   cell_space_ = new CellSpace(this, max_old_generation_size_, CELL_SPACE);
   if (cell_space_ == NULL) return false;
-  if (!cell_space_->Setup()) return false;
+  if (!cell_space_->SetUp()) return false;
 
   // The large object code space may contain code or data.  We set the memory
   // to be non-executable here for safety, but this means we need to enable it
   // explicitly when allocating large code objects.
   lo_space_ = new LargeObjectSpace(this, max_old_generation_size_, LO_SPACE);
   if (lo_space_ == NULL) return false;
-  if (!lo_space_->Setup()) return false;
+  if (!lo_space_->SetUp()) return false;
 
-  // Setup the seed that is used to randomize the string hash function.
-  ASSERT(string_hash_seed() == 0);
-  if (FLAG_randomize_string_hashes) {
-    if (FLAG_string_hash_seed == 0) {
-      set_string_hash_seed(
+  // Set up the seed that is used to randomize the string hash function.
+  ASSERT(hash_seed() == 0);
+  if (FLAG_randomize_hashes) {
+    if (FLAG_hash_seed == 0) {
+      set_hash_seed(
           Smi::FromInt(V8::RandomPrivate(isolate()) & 0x3fffffff));
     } else {
-      set_string_hash_seed(Smi::FromInt(FLAG_string_hash_seed));
+      set_hash_seed(Smi::FromInt(FLAG_hash_seed));
     }
   }
 
@@ -5668,7 +5703,7 @@ bool Heap::Setup(bool create_heap_objects) {
   LOG(isolate_, IntPtrTEvent("heap-capacity", Capacity()));
   LOG(isolate_, IntPtrTEvent("heap-available", Available()));
 
-  store_buffer()->Setup();
+  store_buffer()->SetUp();
 
   return true;
 }
diff --git a/deps/v8/src/heap.h b/deps/v8/src/heap.h
index 2d993bbc2..a1a53db4a 100644
--- a/deps/v8/src/heap.h
+++ b/deps/v8/src/heap.h
@@ -96,7 +96,7 @@ inline Heap* _inline_get_heap_();
   V(FixedArray, single_character_string_cache, SingleCharacterStringCache)     \
   V(FixedArray, string_split_cache, StringSplitCache)                          \
   V(Object, termination_exception, TerminationException)                       \
-  V(Smi, string_hash_seed, StringHashSeed)                                     \
+  V(Smi, hash_seed, HashSeed)                                                  \
   V(Map, string_map, StringMap)                                                \
   V(Map, symbol_map, SymbolMap)                                                \
   V(Map, cons_string_map, ConsStringMap)                                       \
@@ -146,8 +146,8 @@ inline Heap* _inline_get_heap_();
   V(Map, neander_map, NeanderMap)                                              \
   V(JSObject, message_listeners, MessageListeners)                             \
   V(Foreign, prototype_accessors, PrototypeAccessors)                          \
-  V(NumberDictionary, code_stubs, CodeStubs)                                   \
-  V(NumberDictionary, non_monomorphic_cache, NonMonomorphicCache)              \
+  V(UnseededNumberDictionary, code_stubs, CodeStubs)                           \
+  V(UnseededNumberDictionary, non_monomorphic_cache, NonMonomorphicCache)      \
   V(PolymorphicCodeCache, polymorphic_code_cache, PolymorphicCodeCache)        \
   V(Code, js_entry_code, JsEntryCode)                                          \
   V(Code, js_construct_entry_code, JsConstructEntryCode)                       \
@@ -434,7 +434,7 @@ class ExternalStringTable {
 class Heap {
  public:
   // Configure heap size before setup. Return false if the heap has been
-  // setup already.
+  // set up already.
   bool ConfigureHeap(int max_semispace_size,
                      intptr_t max_old_gen_size,
                      intptr_t max_executable_size);
@@ -443,7 +443,7 @@ class Heap {
   // Initializes the global object heap. If create_heap_objects is true,
   // also creates the basic non-mutable objects.
   // Returns whether it succeeded.
-  bool Setup(bool create_heap_objects);
+  bool SetUp(bool create_heap_objects);
 
   // Destroys all memory allocated by the heap.
   void TearDown();
@@ -453,8 +453,8 @@ class Heap {
   // jslimit_/real_jslimit_ variable in the StackGuard.
   void SetStackLimits();
 
-  // Returns whether Setup has been called.
-  bool HasBeenSetup();
+  // Returns whether SetUp has been called.
+  bool HasBeenSetUp();
 
   // Returns the maximum amount of memory reserved for the heap.  For
   // the young generation, we reserve 4 times the amount needed for a
@@ -615,6 +615,9 @@ class Heap {
   // Allocates an empty PolymorphicCodeCache.
   MUST_USE_RESULT MaybeObject* AllocatePolymorphicCodeCache();
 
+  // Allocates a pre-tenured empty AccessorPair.
+  MUST_USE_RESULT MaybeObject* AllocateAccessorPair();
+
   // Clear the Instanceof cache (used when a prototype changes).
   inline void ClearInstanceofCache();
 
@@ -1136,7 +1139,7 @@ class Heap {
   inline AllocationSpace TargetSpaceId(InstanceType type);
 
   // Sets the stub_cache_ (only used when expanding the dictionary).
-  void public_set_code_stubs(NumberDictionary* value) {
+  void public_set_code_stubs(UnseededNumberDictionary* value) {
     roots_[kCodeStubsRootIndex] = value;
   }
 
@@ -1148,7 +1151,7 @@ class Heap {
   }
 
   // Sets the non_monomorphic_cache_ (only used when expanding the dictionary).
-  void public_set_non_monomorphic_cache(NumberDictionary* value) {
+  void public_set_non_monomorphic_cache(UnseededNumberDictionary* value) {
     roots_[kNonMonomorphicCacheRootIndex] = value;
   }
 
@@ -1409,6 +1412,8 @@ class Heap {
 
   void ProcessWeakReferences(WeakObjectRetainer* retainer);
 
+  void VisitExternalResources(v8::ExternalResourceVisitor* visitor);
+
   // Helper function that governs the promotion policy from new space to
   // old.  If the object's old address lies below the new space's age
   // mark or if we've already filled the bottom 1/16th of the to space,
@@ -1506,9 +1511,9 @@ class Heap {
     return idle_notification_will_schedule_next_gc_;
   }
 
-  uint32_t StringHashSeed() {
-    uint32_t seed = static_cast<uint32_t>(string_hash_seed()->value());
-    ASSERT(FLAG_randomize_string_hashes || seed == 0);
+  uint32_t HashSeed() {
+    uint32_t seed = static_cast<uint32_t>(hash_seed()->value());
+    ASSERT(FLAG_randomize_hashes || seed == 0);
     return seed;
   }
 
@@ -1911,7 +1916,7 @@ class Heap {
   PromotionQueue promotion_queue_;
 
   // Flag is set when the heap has been configured.  The heap can be repeatedly
-  // configured through the API until it is setup.
+  // configured through the API until it is set up.
   bool configured_;
 
   ExternalStringTable external_string_table_;
diff --git a/deps/v8/src/hydrogen-instructions.cc b/deps/v8/src/hydrogen-instructions.cc
index 1ff7f16fd..887e80afc 100644
--- a/deps/v8/src/hydrogen-instructions.cc
+++ b/deps/v8/src/hydrogen-instructions.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -788,6 +788,29 @@ HValue* HTypeof::Canonicalize() {
 }
 
 
+HValue* HBitwise::Canonicalize() {
+  if (!representation().IsInteger32()) return this;
+  // If x is an int32, then x & -1 == x, x | 0 == x and x ^ 0 == x.
+  int32_t nop_constant = (op() == Token::BIT_AND) ? -1 : 0;
+  if (left()->IsConstant() &&
+      HConstant::cast(left())->HasInteger32Value() &&
+      HConstant::cast(left())->Integer32Value() == nop_constant) {
+    return right();
+  }
+  if (right()->IsConstant() &&
+      HConstant::cast(right())->HasInteger32Value() &&
+      HConstant::cast(right())->Integer32Value() == nop_constant) {
+    return left();
+  }
+  return this;
+}
+
+
+HValue* HChange::Canonicalize() {
+  return (from().Equals(to())) ? value() : this;
+}
+
+
 void HTypeof::PrintDataTo(StringStream* stream) {
   value()->PrintNameTo(stream);
 }
diff --git a/deps/v8/src/hydrogen-instructions.h b/deps/v8/src/hydrogen-instructions.h
index 1856c8092..5082e4d3f 100644
--- a/deps/v8/src/hydrogen-instructions.h
+++ b/deps/v8/src/hydrogen-instructions.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -146,6 +146,7 @@ class LChunkBuilder;
   V(Parameter)                                 \
   V(Power)                                     \
   V(PushArgument)                              \
+  V(Random)                                    \
   V(RegExpLiteral)                             \
   V(Return)                                    \
   V(Sar)                                       \
@@ -1130,12 +1131,16 @@ class HChange: public HUnaryOperation {
 
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited);
   virtual HType CalculateInferredType();
+  virtual HValue* Canonicalize();
 
   Representation from() { return value()->representation(); }
   Representation to() { return representation(); }
   bool deoptimize_on_undefined() const {
     return CheckFlag(kDeoptimizeOnUndefined);
   }
+  bool deoptimize_on_minus_zero() const {
+    return CheckFlag(kBailoutOnMinusZero);
+  }
   virtual Representation RequiredInputRepresentation(int index) {
     return from();
   }
@@ -1921,8 +1926,11 @@ class HLoadExternalArrayPointer: public HUnaryOperation {
 
 class HCheckMap: public HTemplateInstruction<2> {
  public:
-  HCheckMap(HValue* value, Handle<Map> map, HValue* typecheck = NULL)
-      : map_(map) {
+  HCheckMap(HValue* value, Handle<Map> map,
+            HValue* typecheck = NULL,
+            CompareMapMode mode = REQUIRE_EXACT_MAP)
+      : map_(map),
+        mode_(mode) {
     SetOperandAt(0, value);
     // If callers don't depend on a typecheck, they can pass in NULL. In that
     // case we use a copy of the |value| argument as a dummy value.
@@ -1930,6 +1938,9 @@ class HCheckMap: public HTemplateInstruction<2> {
     set_representation(Representation::Tagged());
     SetFlag(kUseGVN);
     SetFlag(kDependsOnMaps);
+    has_element_transitions_ =
+        map->LookupElementsTransitionMap(FAST_DOUBLE_ELEMENTS, NULL) != NULL ||
+        map->LookupElementsTransitionMap(FAST_ELEMENTS, NULL) != NULL;
   }
 
   virtual Representation RequiredInputRepresentation(int index) {
@@ -1940,17 +1951,24 @@ class HCheckMap: public HTemplateInstruction<2> {
 
   HValue* value() { return OperandAt(0); }
   Handle<Map> map() const { return map_; }
+  CompareMapMode mode() const { return mode_; }
 
   DECLARE_CONCRETE_INSTRUCTION(CheckMap)
 
  protected:
   virtual bool DataEquals(HValue* other) {
     HCheckMap* b = HCheckMap::cast(other);
-    return map_.is_identical_to(b->map());
+    // Two CheckMaps instructions are DataEqual if their maps are identical and
+    // they have the same mode. The mode comparison can be ignored if the map
+    // has no elements transitions.
+    return map_.is_identical_to(b->map()) &&
+        (b->mode() == mode() || !has_element_transitions_);
   }
 
  private:
+  bool has_element_transitions_;
   Handle<Map> map_;
+  CompareMapMode mode_;
 };
 
 
@@ -2985,6 +3003,23 @@ class HPower: public HTemplateInstruction<2> {
 };
 
 
+class HRandom: public HTemplateInstruction<1> {
+ public:
+  explicit HRandom(HValue* global_object) {
+    SetOperandAt(0, global_object);
+    set_representation(Representation::Double());
+  }
+
+  HValue* global_object() { return OperandAt(0); }
+
+  virtual Representation RequiredInputRepresentation(int index) {
+    return Representation::Tagged();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Random)
+};
+
+
 class HAdd: public HArithmeticBinaryOperation {
  public:
   HAdd(HValue* context, HValue* left, HValue* right)
@@ -3138,6 +3173,8 @@ class HBitwise: public HBitwiseBinaryOperation {
 
   virtual bool IsCommutative() const { return true; }
 
+  virtual HValue* Canonicalize();
+
   static HInstruction* NewHBitwise(Zone* zone,
                                    Token::Value op,
                                    HValue* context,
diff --git a/deps/v8/src/hydrogen.cc b/deps/v8/src/hydrogen.cc
index 923087043..47dcc8053 100644
--- a/deps/v8/src/hydrogen.cc
+++ b/deps/v8/src/hydrogen.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -628,7 +628,11 @@ HGraph::HGraph(CompilationInfo* info)
 Handle<Code> HGraph::Compile(CompilationInfo* info) {
   int values = GetMaximumValueID();
   if (values > LAllocator::max_initial_value_ids()) {
-    if (FLAG_trace_bailout) PrintF("Function is too big\n");
+    if (FLAG_trace_bailout) {
+      SmartArrayPointer<char> name(
+          info->shared_info()->DebugName()->ToCString());
+      PrintF("Function @\"%s\" is too big.\n", *name);
+    }
     return Handle<Code>::null();
   }
 
@@ -2301,7 +2305,7 @@ HGraph* HGraphBuilder::CreateGraph() {
       Bailout("function with illegal redeclaration");
       return NULL;
     }
-    SetupScope(scope);
+    SetUpScope(scope);
 
     // Add an edge to the body entry.  This is warty: the graph's start
     // environment will be used by the Lithium translation as the initial
@@ -2465,7 +2469,7 @@ HInstruction* HGraphBuilder::PreProcessCall(HCall<V>* call) {
 }
 
 
-void HGraphBuilder::SetupScope(Scope* scope) {
+void HGraphBuilder::SetUpScope(Scope* scope) {
   HConstant* undefined_constant = new(zone()) HConstant(
       isolate()->factory()->undefined_value(), Representation::Tagged());
   AddInstruction(undefined_constant);
@@ -3572,7 +3576,8 @@ HInstruction* HGraphBuilder::BuildStoreNamedField(HValue* object,
                                                   bool smi_and_map_check) {
   if (smi_and_map_check) {
     AddInstruction(new(zone()) HCheckNonSmi(object));
-    AddInstruction(new(zone()) HCheckMap(object, type));
+    AddInstruction(new(zone()) HCheckMap(object, type, NULL,
+                                         ALLOW_ELEMENT_TRANSITION_MAPS));
   }
 
   int index = ComputeStoredFieldIndex(type, name, lookup);
@@ -4117,7 +4122,8 @@ HLoadNamedField* HGraphBuilder::BuildLoadNamedField(HValue* object,
                                                     bool smi_and_map_check) {
   if (smi_and_map_check) {
     AddInstruction(new(zone()) HCheckNonSmi(object));
-    AddInstruction(new(zone()) HCheckMap(object, type));
+    AddInstruction(new(zone()) HCheckMap(object, type, NULL,
+                                         ALLOW_ELEMENT_TRANSITION_MAPS));
   }
 
   int index = lookup->GetLocalFieldIndexFromMap(*type);
@@ -4157,7 +4163,8 @@ HInstruction* HGraphBuilder::BuildLoadNamed(HValue* obj,
                                true);
   } else if (lookup.IsProperty() && lookup.type() == CONSTANT_FUNCTION) {
     AddInstruction(new(zone()) HCheckNonSmi(obj));
-    AddInstruction(new(zone()) HCheckMap(obj, map));
+    AddInstruction(new(zone()) HCheckMap(obj, map, NULL,
+                                         ALLOW_ELEMENT_TRANSITION_MAPS));
     Handle<JSFunction> function(lookup.GetConstantFunctionFromMap(*map));
     return new(zone()) HConstant(function, Representation::Tagged());
   } else {
@@ -4652,7 +4659,8 @@ void HGraphBuilder::AddCheckConstantFunction(Call* expr,
   // its prototypes.
   if (smi_and_map_check) {
     AddInstruction(new(zone()) HCheckNonSmi(receiver));
-    AddInstruction(new(zone()) HCheckMap(receiver, receiver_map));
+    AddInstruction(new(zone()) HCheckMap(receiver, receiver_map, NULL,
+                                         ALLOW_ELEMENT_TRANSITION_MAPS));
   }
   if (!expr->holder().is_null()) {
     AddInstruction(new(zone()) HCheckPrototypeMaps(
@@ -5124,6 +5132,69 @@ bool HGraphBuilder::TryInlineBuiltinFunction(Call* expr,
         return true;
       }
       break;
+    case kMathRandom:
+      if (argument_count == 1 && check_type == RECEIVER_MAP_CHECK) {
+        AddCheckConstantFunction(expr, receiver, receiver_map, true);
+        Drop(1);
+        HValue* context = environment()->LookupContext();
+        HGlobalObject* global_object = new(zone()) HGlobalObject(context);
+        AddInstruction(global_object);
+        HRandom* result = new(zone()) HRandom(global_object);
+        ast_context()->ReturnInstruction(result, expr->id());
+        return true;
+      }
+      break;
+    case kMathMax:
+    case kMathMin:
+      if (argument_count == 3 && check_type == RECEIVER_MAP_CHECK) {
+        AddCheckConstantFunction(expr, receiver, receiver_map, true);
+        HValue* right = Pop();
+        HValue* left = Pop();
+        // Do not inline if the return representation is not certain.
+        if (!left->representation().Equals(right->representation())) {
+          Push(left);
+          Push(right);
+          return false;
+        }
+
+        Pop();  // Pop receiver.
+        Token::Value op = (id == kMathMin) ? Token::LT : Token::GT;
+        HCompareIDAndBranch* compare = NULL;
+
+        if (left->representation().IsTagged()) {
+          HChange* left_cvt =
+              new(zone()) HChange(left, Representation::Double(), false, true);
+          left_cvt->SetFlag(HValue::kBailoutOnMinusZero);
+          AddInstruction(left_cvt);
+          HChange* right_cvt =
+              new(zone()) HChange(right, Representation::Double(), false, true);
+          right_cvt->SetFlag(HValue::kBailoutOnMinusZero);
+          AddInstruction(right_cvt);
+          compare = new(zone()) HCompareIDAndBranch(left_cvt, right_cvt, op);
+          compare->SetInputRepresentation(Representation::Double());
+        } else {
+          compare = new(zone()) HCompareIDAndBranch(left, right, op);
+          compare->SetInputRepresentation(left->representation());
+        }
+
+        HBasicBlock* return_left = graph()->CreateBasicBlock();
+        HBasicBlock* return_right = graph()->CreateBasicBlock();
+
+        compare->SetSuccessorAt(0, return_left);
+        compare->SetSuccessorAt(1, return_right);
+        current_block()->Finish(compare);
+
+        set_current_block(return_left);
+        Push(left);
+        set_current_block(return_right);
+        Push(right);
+
+        HBasicBlock* join = CreateJoin(return_left, return_right, expr->id());
+        set_current_block(join);
+        ast_context()->ReturnValue(Pop());
+        return true;
+      }
+      break;
     default:
       // Not yet supported for inlining.
       break;
@@ -6195,9 +6266,11 @@ void HGraphBuilder::VisitCompareOperation(CompareOperation* expr) {
         Handle<Map> map = oracle()->GetCompareMap(expr);
         if (!map.is_null()) {
           AddInstruction(new(zone()) HCheckNonSmi(left));
-          AddInstruction(new(zone()) HCheckMap(left, map));
+          AddInstruction(new(zone()) HCheckMap(left, map, NULL,
+                                               ALLOW_ELEMENT_TRANSITION_MAPS));
           AddInstruction(new(zone()) HCheckNonSmi(right));
-          AddInstruction(new(zone()) HCheckMap(right, map));
+          AddInstruction(new(zone()) HCheckMap(right, map, NULL,
+                                               ALLOW_ELEMENT_TRANSITION_MAPS));
           HCompareObjectEqAndBranch* result =
               new(zone()) HCompareObjectEqAndBranch(left, right);
           result->set_position(expr->position());
@@ -6569,7 +6642,11 @@ void HGraphBuilder::GenerateLog(CallRuntime* call) {
 
 // Fast support for Math.random().
 void HGraphBuilder::GenerateRandomHeapNumber(CallRuntime* call) {
-  return Bailout("inlined runtime function: RandomHeapNumber");
+  HValue* context = environment()->LookupContext();
+  HGlobalObject* global_object = new(zone()) HGlobalObject(context);
+  AddInstruction(global_object);
+  HRandom* result = new(zone()) HRandom(global_object);
+  return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
diff --git a/deps/v8/src/hydrogen.h b/deps/v8/src/hydrogen.h
index ded1356d1..970585906 100644
--- a/deps/v8/src/hydrogen.h
+++ b/deps/v8/src/hydrogen.h
@@ -870,7 +870,7 @@ class HGraphBuilder: public AstVisitor {
                            Representation rep);
   static Representation ToRepresentation(TypeInfo info);
 
-  void SetupScope(Scope* scope);
+  void SetUpScope(Scope* scope);
   virtual void VisitStatements(ZoneList<Statement*>* statements);
 
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
diff --git a/deps/v8/src/ia32/assembler-ia32.cc b/deps/v8/src/ia32/assembler-ia32.cc
index 7a5a19164..bb050b63f 100644
--- a/deps/v8/src/ia32/assembler-ia32.cc
+++ b/deps/v8/src/ia32/assembler-ia32.cc
@@ -350,7 +350,7 @@ Assembler::Assembler(Isolate* arg_isolate, void* buffer, int buffer_size)
   }
 #endif
 
-  // Setup buffer pointers.
+  // Set up buffer pointers.
   ASSERT(buffer_ != NULL);
   pc_ = buffer_;
   reloc_info_writer.Reposition(buffer_ + buffer_size, pc_);
@@ -377,7 +377,7 @@ void Assembler::GetCode(CodeDesc* desc) {
   // Finalize code (at this point overflow() may be true, but the gap ensures
   // that we are still not overlapping instructions and relocation info).
   ASSERT(pc_ <= reloc_info_writer.pos());  // No overlap.
-  // Setup code descriptor.
+  // Set up code descriptor.
   desc->buffer = buffer_;
   desc->buffer_size = buffer_size_;
   desc->instr_size = pc_offset();
@@ -2457,7 +2457,7 @@ void Assembler::GrowBuffer() {
     V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
   }
 
-  // Setup new buffer.
+  // Set up new buffer.
   desc.buffer = NewArray<byte>(desc.buffer_size);
   desc.instr_size = pc_offset();
   desc.reloc_size = (buffer_ + buffer_size_) - (reloc_info_writer.pos());
diff --git a/deps/v8/src/ia32/builtins-ia32.cc b/deps/v8/src/ia32/builtins-ia32.cc
index 55f66f1df..4666311af 100644
--- a/deps/v8/src/ia32/builtins-ia32.cc
+++ b/deps/v8/src/ia32/builtins-ia32.cc
@@ -333,7 +333,7 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     __ push(ebx);
     __ push(ebx);
 
-    // Setup pointer to last argument.
+    // Set up pointer to last argument.
     __ lea(ebx, Operand(ebp, StandardFrameConstants::kCallerSPOffset));
 
     // Copy arguments and receiver to the expression stack.
diff --git a/deps/v8/src/ia32/code-stubs-ia32.cc b/deps/v8/src/ia32/code-stubs-ia32.cc
index 9bc024f40..b654390c2 100644
--- a/deps/v8/src/ia32/code-stubs-ia32.cc
+++ b/deps/v8/src/ia32/code-stubs-ia32.cc
@@ -128,14 +128,14 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
   // Get the function from the stack.
   __ mov(ecx, Operand(esp, 1 * kPointerSize));
 
-  // Setup the object header.
+  // Set up the object header.
   Factory* factory = masm->isolate()->factory();
   __ mov(FieldOperand(eax, HeapObject::kMapOffset),
          factory->function_context_map());
   __ mov(FieldOperand(eax, Context::kLengthOffset),
          Immediate(Smi::FromInt(length)));
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ Set(ebx, Immediate(0));  // Set to NULL.
   __ mov(Operand(eax, Context::SlotOffset(Context::CLOSURE_INDEX)), ecx);
   __ mov(Operand(eax, Context::SlotOffset(Context::PREVIOUS_INDEX)), esi);
@@ -179,7 +179,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   // Get the serialized scope info from the stack.
   __ mov(ebx, Operand(esp, 2 * kPointerSize));
 
-  // Setup the object header.
+  // Set up the object header.
   Factory* factory = masm->isolate()->factory();
   __ mov(FieldOperand(eax, HeapObject::kMapOffset),
          factory->block_context_map());
@@ -202,7 +202,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   __ mov(ecx, ContextOperand(ecx, Context::CLOSURE_INDEX));
   __ bind(&after_sentinel);
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ mov(ContextOperand(eax, Context::CLOSURE_INDEX), ecx);
   __ mov(ContextOperand(eax, Context::PREVIOUS_INDEX), esi);
   __ mov(ContextOperand(eax, Context::EXTENSION_INDEX), ebx);
@@ -3379,7 +3379,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
     __ mov(FieldOperand(eax, i), edx);
   }
 
-  // Setup the callee in-object property.
+  // Set up the callee in-object property.
   STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
   __ mov(edx, Operand(esp, 4 * kPointerSize));
   __ mov(FieldOperand(eax, JSObject::kHeaderSize +
@@ -3392,7 +3392,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
                       Heap::kArgumentsLengthIndex * kPointerSize),
          ecx);
 
-  // Setup the elements pointer in the allocated arguments object.
+  // Set up the elements pointer in the allocated arguments object.
   // If we allocated a parameter map, edi will point there, otherwise to the
   // backing store.
   __ lea(edi, Operand(eax, Heap::kArgumentsObjectSize));
@@ -3571,7 +3571,7 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
   // Get the parameters pointer from the stack.
   __ mov(edx, Operand(esp, 2 * kPointerSize));
 
-  // Setup the elements pointer in the allocated arguments object and
+  // Set up the elements pointer in the allocated arguments object and
   // initialize the header in the elements fixed array.
   __ lea(edi, Operand(eax, Heap::kArgumentsObjectSizeStrict));
   __ mov(FieldOperand(eax, JSObject::kElementsOffset), edi);
@@ -4950,7 +4950,7 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   Label invoke, handler_entry, exit;
   Label not_outermost_js, not_outermost_js_2;
 
-  // Setup frame.
+  // Set up frame.
   __ push(ebp);
   __ mov(ebp, esp);
 
@@ -5081,8 +5081,8 @@ void InstanceofStub::Generate(MacroAssembler* masm) {
   static const int kDeltaToCmpImmediate = 2;
   static const int kDeltaToMov = 8;
   static const int kDeltaToMovImmediate = 9;
-  static const int8_t kCmpEdiImmediateByte1 = BitCast<int8_t, uint8_t>(0x81);
-  static const int8_t kCmpEdiImmediateByte2 = BitCast<int8_t, uint8_t>(0xff);
+  static const int8_t kCmpEdiOperandByte1 = BitCast<int8_t, uint8_t>(0x3b);
+  static const int8_t kCmpEdiOperandByte2 = BitCast<int8_t, uint8_t>(0x3d);
   static const int8_t kMovEaxImmediateByte = BitCast<int8_t, uint8_t>(0xb8);
 
   ExternalReference roots_array_start =
@@ -5147,12 +5147,13 @@ void InstanceofStub::Generate(MacroAssembler* masm) {
     __ mov(scratch, Operand(esp, 0 * kPointerSize));
     __ sub(scratch, Operand(esp, 1 * kPointerSize));
     if (FLAG_debug_code) {
-      __ cmpb(Operand(scratch, 0), kCmpEdiImmediateByte1);
+      __ cmpb(Operand(scratch, 0), kCmpEdiOperandByte1);
       __ Assert(equal, "InstanceofStub unexpected call site cache (cmp 1)");
-      __ cmpb(Operand(scratch, 1), kCmpEdiImmediateByte2);
+      __ cmpb(Operand(scratch, 1), kCmpEdiOperandByte2);
       __ Assert(equal, "InstanceofStub unexpected call site cache (cmp 2)");
     }
-    __ mov(Operand(scratch, kDeltaToCmpImmediate), map);
+    __ mov(scratch, Operand(scratch, kDeltaToCmpImmediate));
+    __ mov(Operand(scratch, 0), map);
   }
 
   // Loop through the prototype chain of the object looking for the function
@@ -6037,7 +6038,7 @@ void StringHelper::GenerateHashInit(MacroAssembler* masm,
   if (Serializer::enabled()) {
     ExternalReference roots_array_start =
         ExternalReference::roots_array_start(masm->isolate());
-    __ mov(scratch, Immediate(Heap::kStringHashSeedRootIndex));
+    __ mov(scratch, Immediate(Heap::kHashSeedRootIndex));
     __ mov(scratch, Operand::StaticArray(scratch,
                                          times_pointer_size,
                                          roots_array_start));
@@ -6046,7 +6047,7 @@ void StringHelper::GenerateHashInit(MacroAssembler* masm,
     __ shl(scratch, 10);
     __ add(hash, scratch);
   } else {
-    int32_t seed = masm->isolate()->heap()->StringHashSeed();
+    int32_t seed = masm->isolate()->heap()->HashSeed();
     __ lea(scratch, Operand(character, seed));
     __ shl(scratch, 10);
     __ lea(hash, Operand(scratch, character, times_1, seed));
@@ -6091,14 +6092,12 @@ void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
   __ shl(scratch, 15);
   __ add(hash, scratch);
 
-  uint32_t kHashShiftCutOffMask = (1 << (32 - String::kHashShift)) - 1;
-  __ and_(hash, kHashShiftCutOffMask);
+  __ and_(hash, String::kHashBitMask);
 
   // if (hash == 0) hash = 27;
   Label hash_not_zero;
-  __ test(hash, hash);
   __ j(not_zero, &hash_not_zero, Label::kNear);
-  __ mov(hash, Immediate(27));
+  __ mov(hash, Immediate(StringHasher::kZeroHash));
   __ bind(&hash_not_zero);
 }
 
diff --git a/deps/v8/src/ia32/cpu-ia32.cc b/deps/v8/src/ia32/cpu-ia32.cc
index 57e66df9e..9eabb2a96 100644
--- a/deps/v8/src/ia32/cpu-ia32.cc
+++ b/deps/v8/src/ia32/cpu-ia32.cc
@@ -41,7 +41,7 @@
 namespace v8 {
 namespace internal {
 
-void CPU::Setup() {
+void CPU::SetUp() {
   CpuFeatures::Probe();
 }
 
diff --git a/deps/v8/src/ia32/deoptimizer-ia32.cc b/deps/v8/src/ia32/deoptimizer-ia32.cc
index 98c240079..292315d10 100644
--- a/deps/v8/src/ia32/deoptimizer-ia32.cc
+++ b/deps/v8/src/ia32/deoptimizer-ia32.cc
@@ -406,7 +406,7 @@ void Deoptimizer::DoComputeOsrOutputFrame() {
     output_[0] = input_;
     output_[0]->SetPc(reinterpret_cast<uint32_t>(from_));
   } else {
-    // Setup the frame pointer and the context pointer.
+    // Set up the frame pointer and the context pointer.
     // All OSR stack frames are dynamically aligned to an 8-byte boundary.
     int frame_pointer = input_->GetRegister(ebp.code());
     if ((frame_pointer & 0x4) == 0) {
diff --git a/deps/v8/src/ia32/full-codegen-ia32.cc b/deps/v8/src/ia32/full-codegen-ia32.cc
index 6e2391110..4f3274436 100644
--- a/deps/v8/src/ia32/full-codegen-ia32.cc
+++ b/deps/v8/src/ia32/full-codegen-ia32.cc
@@ -967,7 +967,7 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ mov(ecx, FieldOperand(ecx, DescriptorArray::kEnumerationIndexOffset));
   __ mov(edx, FieldOperand(ecx, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
-  // Setup the four remaining stack slots.
+  // Set up the four remaining stack slots.
   __ push(eax);  // Map.
   __ push(edx);  // Enumeration cache.
   __ mov(eax, FieldOperand(edx, FixedArray::kLengthOffset));
diff --git a/deps/v8/src/ia32/lithium-codegen-ia32.cc b/deps/v8/src/ia32/lithium-codegen-ia32.cc
index 137d62c55..8d412fdb5 100644
--- a/deps/v8/src/ia32/lithium-codegen-ia32.cc
+++ b/deps/v8/src/ia32/lithium-codegen-ia32.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1831,7 +1831,7 @@ void LCodeGen::DoHasCachedArrayIndexAndBranch(
 
 
 // Branches to a label or falls through with the answer in the z flag.  Trashes
-// the temp registers, but not the input.  Only input and temp2 may alias.
+// the temp registers, but not the input.
 void LCodeGen::EmitClassOfTest(Label* is_true,
                                Label* is_false,
                                Handle<String>class_name,
@@ -1839,7 +1839,8 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
                                Register temp,
                                Register temp2) {
   ASSERT(!input.is(temp));
-  ASSERT(!temp.is(temp2));  // But input and temp2 may be the same register.
+  ASSERT(!input.is(temp2));
+  ASSERT(!temp.is(temp2));
   __ JumpIfSmi(input, is_false);
 
   if (class_name->IsEqualTo(CStrVector("Function"))) {
@@ -1899,12 +1900,7 @@ void LCodeGen::DoClassOfTestAndBranch(LClassOfTestAndBranch* instr) {
   Register input = ToRegister(instr->InputAt(0));
   Register temp = ToRegister(instr->TempAt(0));
   Register temp2 = ToRegister(instr->TempAt(1));
-  if (input.is(temp)) {
-    // Swap.
-    Register swapper = temp;
-    temp = temp2;
-    temp2 = swapper;
-  }
+
   Handle<String> class_name = instr->hydrogen()->class_name();
 
   int true_block = chunk_->LookupDestination(instr->true_block_id());
@@ -1979,7 +1975,9 @@ void LCodeGen::DoInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr) {
   Register map = ToRegister(instr->TempAt(0));
   __ mov(map, FieldOperand(object, HeapObject::kMapOffset));
   __ bind(deferred->map_check());  // Label for calculating code patching.
-  __ cmp(map, factory()->the_hole_value());  // Patched to cached map.
+  Handle<JSGlobalPropertyCell> cache_cell =
+      factory()->NewJSGlobalPropertyCell(factory()->the_hole_value());
+  __ cmp(map, Operand::Cell(cache_cell));  // Patched to cached map.
   __ j(not_equal, &cache_miss, Label::kNear);
   __ mov(eax, factory()->the_hole_value());  // Patched to either true or false.
   __ jmp(&done);
@@ -3016,6 +3014,29 @@ void LCodeGen::DoPower(LPower* instr) {
 }
 
 
+void LCodeGen::DoRandom(LRandom* instr) {
+  // Having marked this instruction as a call we can use any
+  // registers.
+  ASSERT(ToDoubleRegister(instr->result()).is(xmm1));
+  ASSERT(ToRegister(instr->InputAt(0)).is(eax));
+
+  __ PrepareCallCFunction(1, ebx);
+  __ mov(eax, FieldOperand(eax, GlobalObject::kGlobalContextOffset));
+  __ mov(Operand(esp, 0), eax);
+  __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
+
+  // Convert 32 random bits in eax to 0.(32 random bits) in a double
+  // by computing:
+  // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
+  __ mov(ebx, Immediate(0x49800000));  // 1.0 x 2^20 as single.
+  __ movd(xmm2, ebx);
+  __ movd(xmm1, eax);
+  __ cvtss2sd(xmm2, xmm2);
+  __ xorps(xmm1, xmm2);
+  __ subsd(xmm1, xmm2);
+}
+
+
 void LCodeGen::DoMathLog(LUnaryMathOperation* instr) {
   ASSERT(instr->value()->Equals(instr->result()));
   XMMRegister input_reg = ToDoubleRegister(instr->value());
@@ -3678,8 +3699,10 @@ void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
 
 
 void LCodeGen::EmitNumberUntagD(Register input_reg,
+                                Register temp_reg,
                                 XMMRegister result_reg,
                                 bool deoptimize_on_undefined,
+                                bool deoptimize_on_minus_zero,
                                 LEnvironment* env) {
   Label load_smi, done;
 
@@ -3708,6 +3731,15 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
   }
   // Heap number to XMM conversion.
   __ movdbl(result_reg, FieldOperand(input_reg, HeapNumber::kValueOffset));
+  if (deoptimize_on_minus_zero) {
+    XMMRegister xmm_scratch = xmm0;
+    __ xorps(xmm_scratch, xmm_scratch);
+    __ ucomisd(result_reg, xmm_scratch);
+    __ j(not_zero, &done, Label::kNear);
+    __ movmskpd(temp_reg, result_reg);
+    __ test_b(temp_reg, 1);
+    DeoptimizeIf(not_zero, env);
+  }
   __ jmp(&done, Label::kNear);
 
   // Smi to XMM conversion
@@ -3830,14 +3862,23 @@ void LCodeGen::DoTaggedToI(LTaggedToI* instr) {
 void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
   LOperand* input = instr->InputAt(0);
   ASSERT(input->IsRegister());
+  LOperand* temp = instr->TempAt(0);
+  ASSERT(temp == NULL || temp->IsRegister());
   LOperand* result = instr->result();
   ASSERT(result->IsDoubleRegister());
 
   Register input_reg = ToRegister(input);
   XMMRegister result_reg = ToDoubleRegister(result);
 
-  EmitNumberUntagD(input_reg, result_reg,
+  bool deoptimize_on_minus_zero =
+      instr->hydrogen()->deoptimize_on_minus_zero();
+  Register temp_reg = deoptimize_on_minus_zero ? ToRegister(temp) : no_reg;
+
+  EmitNumberUntagD(input_reg,
+                   temp_reg,
+                   result_reg,
                    instr->hydrogen()->deoptimize_on_undefined(),
+                   deoptimize_on_minus_zero,
                    instr->environment());
 }
 
@@ -4033,13 +4074,23 @@ void LCodeGen::DoCheckFunction(LCheckFunction* instr) {
 }
 
 
+void LCodeGen::DoCheckMapCommon(Register reg,
+                                Handle<Map> map,
+                                CompareMapMode mode,
+                                LEnvironment* env) {
+  Label success;
+  __ CompareMap(reg, map, &success, mode);
+  DeoptimizeIf(not_equal, env);
+  __ bind(&success);
+}
+
+
 void LCodeGen::DoCheckMap(LCheckMap* instr) {
   LOperand* input = instr->InputAt(0);
   ASSERT(input->IsRegister());
   Register reg = ToRegister(input);
-  __ cmp(FieldOperand(reg, HeapObject::kMapOffset),
-         instr->hydrogen()->map());
-  DeoptimizeIf(not_equal, instr->environment());
+  Handle<Map> map = instr->hydrogen()->map();
+  DoCheckMapCommon(reg, map, instr->hydrogen()->mode(), instr->environment());
 }
 
 
@@ -4102,9 +4153,9 @@ void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
 
   // Check prototype maps up to the holder.
   while (!current_prototype.is_identical_to(holder)) {
-    __ cmp(FieldOperand(reg, HeapObject::kMapOffset),
-           Handle<Map>(current_prototype->map()));
-    DeoptimizeIf(not_equal, instr->environment());
+    DoCheckMapCommon(reg, Handle<Map>(current_prototype->map()),
+                     ALLOW_ELEMENT_TRANSITION_MAPS, instr->environment());
+
     current_prototype =
         Handle<JSObject>(JSObject::cast(current_prototype->GetPrototype()));
     // Load next prototype object.
@@ -4112,9 +4163,8 @@ void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
   }
 
   // Check the holder map.
-  __ cmp(FieldOperand(reg, HeapObject::kMapOffset),
-         Handle<Map>(current_prototype->map()));
-  DeoptimizeIf(not_equal, instr->environment());
+  DoCheckMapCommon(reg, Handle<Map>(current_prototype->map()),
+                   ALLOW_ELEMENT_TRANSITION_MAPS, instr->environment());
 }
 
 
@@ -4139,7 +4189,7 @@ void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
     DeoptimizeIf(not_equal, instr->environment());
   }
 
-  // Setup the parameters to the stub/runtime call.
+  // Set up the parameters to the stub/runtime call.
   __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
   __ push(FieldOperand(eax, JSFunction::kLiteralsOffset));
   __ push(Immediate(Smi::FromInt(instr->hydrogen()->literal_index())));
@@ -4247,7 +4297,7 @@ void LCodeGen::DoObjectLiteralGeneric(LObjectLiteralGeneric* instr) {
   Handle<FixedArray> constant_properties =
       instr->hydrogen()->constant_properties();
 
-  // Setup the parameters to the stub/runtime call.
+  // Set up the parameters to the stub/runtime call.
   __ mov(eax, Operand(ebp, JavaScriptFrameConstants::kFunctionOffset));
   __ push(FieldOperand(eax, JSFunction::kLiteralsOffset));
   __ push(Immediate(Smi::FromInt(instr->hydrogen()->literal_index())));
diff --git a/deps/v8/src/ia32/lithium-codegen-ia32.h b/deps/v8/src/ia32/lithium-codegen-ia32.h
index 375f137d7..d86d48cd8 100644
--- a/deps/v8/src/ia32/lithium-codegen-ia32.h
+++ b/deps/v8/src/ia32/lithium-codegen-ia32.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -110,6 +110,9 @@ class LCodeGen BASE_EMBEDDED {
   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
                                        Label* map_check);
 
+  void DoCheckMapCommon(Register reg, Handle<Map> map,
+                        CompareMapMode mode, LEnvironment* env);
+
   // Parallel move support.
   void DoParallelMove(LParallelMove* move);
   void DoGap(LGap* instr);
@@ -265,8 +268,10 @@ class LCodeGen BASE_EMBEDDED {
   void EmitGoto(int block);
   void EmitBranch(int left_block, int right_block, Condition cc);
   void EmitNumberUntagD(Register input,
+                        Register temp,
                         XMMRegister result,
                         bool deoptimize_on_undefined,
+                        bool deoptimize_on_minus_zero,
                         LEnvironment* env);
 
   // Emits optimized code for typeof x == "y".  Modifies input register.
@@ -380,7 +385,7 @@ class LDeferredCode: public ZoneObject {
   virtual void Generate() = 0;
   virtual LInstruction* instr() = 0;
 
-  void SetExit(Label *exit) { external_exit_ = exit; }
+  void SetExit(Label* exit) { external_exit_ = exit; }
   Label* entry() { return &entry_; }
   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
   int instruction_index() const { return instruction_index_; }
diff --git a/deps/v8/src/ia32/lithium-ia32.cc b/deps/v8/src/ia32/lithium-ia32.cc
index 5cd276f30..8435a3c2a 100644
--- a/deps/v8/src/ia32/lithium-ia32.cc
+++ b/deps/v8/src/ia32/lithium-ia32.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1047,22 +1047,31 @@ LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
 
 
 LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
-  HValue* v = instr->value();
-  if (v->EmitAtUses()) {
-    ASSERT(v->IsConstant());
-    ASSERT(!v->representation().IsDouble());
-    HBasicBlock* successor = HConstant::cast(v)->ToBoolean()
+  HValue* value = instr->value();
+  if (value->EmitAtUses()) {
+    ASSERT(value->IsConstant());
+    ASSERT(!value->representation().IsDouble());
+    HBasicBlock* successor = HConstant::cast(value)->ToBoolean()
         ? instr->FirstSuccessor()
         : instr->SecondSuccessor();
     return new(zone()) LGoto(successor->block_id());
   }
+
+  // Untagged integers or doubles, smis and booleans don't require a
+  // deoptimization environment nor a temp register.
+  Representation rep = value->representation();
+  HType type = value->type();
+  if (!rep.IsTagged() || type.IsSmi() || type.IsBoolean()) {
+    return new(zone()) LBranch(UseRegister(value), NULL);
+  }
+
   ToBooleanStub::Types expected = instr->expected_input_types();
   // We need a temporary register when we have to access the map *or* we have
   // no type info yet, in which case we handle all cases (including the ones
   // involving maps).
   bool needs_temp = expected.NeedsMap() || expected.IsEmpty();
   LOperand* temp = needs_temp ? TempRegister() : NULL;
-  return AssignEnvironment(new(zone()) LBranch(UseRegister(v), temp));
+  return AssignEnvironment(new(zone()) LBranch(UseRegister(value), temp));
 }
 
 
@@ -1388,7 +1397,11 @@ LInstruction* LChunkBuilder::DoMul(HMul* instr) {
       temp = TempRegister();
     }
     LMulI* mul = new(zone()) LMulI(left, right, temp);
-    return AssignEnvironment(DefineSameAsFirst(mul));
+    if (instr->CheckFlag(HValue::kCanOverflow) ||
+        instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      AssignEnvironment(mul);
+    }
+    return DefineSameAsFirst(mul);
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::MUL, instr);
   } else {
@@ -1456,6 +1469,15 @@ LInstruction* LChunkBuilder::DoPower(HPower* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
+  ASSERT(instr->representation().IsDouble());
+  ASSERT(instr->global_object()->representation().IsTagged());
+  LOperand* global_object = UseFixed(instr->global_object(), eax);
+  LRandom* result = new(zone()) LRandom(global_object);
+  return MarkAsCall(DefineFixedDouble(result, xmm1), instr);
+}
+
+
 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
   ASSERT(instr->left()->representation().IsTagged());
   ASSERT(instr->right()->representation().IsTagged());
@@ -1588,9 +1610,9 @@ LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
 LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
     HClassOfTestAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LClassOfTestAndBranch(UseTempRegister(instr->value()),
-                                   TempRegister(),
-                                   TempRegister());
+  return new(zone()) LClassOfTestAndBranch(UseRegister(instr->value()),
+                                           TempRegister(),
+                                           TempRegister());
 }
 
 
@@ -1616,7 +1638,7 @@ LInstruction* LChunkBuilder::DoElementsKind(HElementsKind* instr) {
 LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
   LOperand* object = UseRegister(instr->value());
   LValueOf* result = new(zone()) LValueOf(object, TempRegister());
-  return AssignEnvironment(DefineSameAsFirst(result));
+  return DefineSameAsFirst(result);
 }
 
 
@@ -1660,7 +1682,11 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
   if (from.IsTagged()) {
     if (to.IsDouble()) {
       LOperand* value = UseRegister(instr->value());
-      LNumberUntagD* res = new(zone()) LNumberUntagD(value);
+      // Temp register only necessary for minus zero check.
+      LOperand* temp = instr->deoptimize_on_minus_zero()
+                       ? TempRegister()
+                       : NULL;
+      LNumberUntagD* res = new(zone()) LNumberUntagD(value, temp);
       return AssignEnvironment(DefineAsRegister(res));
     } else {
       ASSERT(to.IsInteger32());
@@ -1956,7 +1982,8 @@ LInstruction* LChunkBuilder::DoLoadKeyedFastElement(
   LOperand* obj = UseRegisterAtStart(instr->object());
   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LLoadKeyedFastElement* result = new(zone()) LLoadKeyedFastElement(obj, key);
-  return AssignEnvironment(DefineAsRegister(result));
+  if (instr->RequiresHoleCheck()) AssignEnvironment(result);
+  return DefineAsRegister(result);
 }
 
 
diff --git a/deps/v8/src/ia32/lithium-ia32.h b/deps/v8/src/ia32/lithium-ia32.h
index cc3762d7a..67bf9376c 100644
--- a/deps/v8/src/ia32/lithium-ia32.h
+++ b/deps/v8/src/ia32/lithium-ia32.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -135,6 +135,7 @@ class LCodeGen;
   V(OuterContext)                               \
   V(Parameter)                                  \
   V(Power)                                      \
+  V(Random)                                     \
   V(PushArgument)                               \
   V(RegExpLiteral)                              \
   V(Return)                                     \
@@ -1043,6 +1044,17 @@ class LPower: public LTemplateInstruction<1, 2, 0> {
 };
 
 
+class LRandom: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LRandom(LOperand* global_object) {
+    inputs_[0] = global_object;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Random, "random")
+  DECLARE_HYDROGEN_ACCESSOR(Random)
+};
+
+
 class LArithmeticD: public LTemplateInstruction<1, 2, 0> {
  public:
   LArithmeticD(Token::Value op, LOperand* left, LOperand* right)
@@ -1612,10 +1624,11 @@ class LSmiTag: public LTemplateInstruction<1, 1, 0> {
 };
 
 
-class LNumberUntagD: public LTemplateInstruction<1, 1, 0> {
+class LNumberUntagD: public LTemplateInstruction<1, 1, 1> {
  public:
-  explicit LNumberUntagD(LOperand* value) {
+  explicit LNumberUntagD(LOperand* value, LOperand* temp) {
     inputs_[0] = value;
+    temps_[0] = temp;
   }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberUntagD, "double-untag")
diff --git a/deps/v8/src/ia32/macro-assembler-ia32.cc b/deps/v8/src/ia32/macro-assembler-ia32.cc
index 3356e8189..43f265cf0 100644
--- a/deps/v8/src/ia32/macro-assembler-ia32.cc
+++ b/deps/v8/src/ia32/macro-assembler-ia32.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -487,15 +487,48 @@ void MacroAssembler::StoreNumberToDoubleElements(
 }
 
 
+void MacroAssembler::CompareMap(Register obj,
+                                Handle<Map> map,
+                                Label* early_success,
+                                CompareMapMode mode) {
+  cmp(FieldOperand(obj, HeapObject::kMapOffset), map);
+  if (mode == ALLOW_ELEMENT_TRANSITION_MAPS) {
+    Map* transitioned_fast_element_map(
+        map->LookupElementsTransitionMap(FAST_ELEMENTS, NULL));
+    ASSERT(transitioned_fast_element_map == NULL ||
+           map->elements_kind() != FAST_ELEMENTS);
+    if (transitioned_fast_element_map != NULL) {
+      j(equal, early_success, Label::kNear);
+      cmp(FieldOperand(obj, HeapObject::kMapOffset),
+          Handle<Map>(transitioned_fast_element_map));
+    }
+
+    Map* transitioned_double_map(
+        map->LookupElementsTransitionMap(FAST_DOUBLE_ELEMENTS, NULL));
+    ASSERT(transitioned_double_map == NULL ||
+           map->elements_kind() == FAST_SMI_ONLY_ELEMENTS);
+    if (transitioned_double_map != NULL) {
+      j(equal, early_success, Label::kNear);
+      cmp(FieldOperand(obj, HeapObject::kMapOffset),
+          Handle<Map>(transitioned_double_map));
+    }
+  }
+}
+
+
 void MacroAssembler::CheckMap(Register obj,
                               Handle<Map> map,
                               Label* fail,
-                              SmiCheckType smi_check_type) {
+                              SmiCheckType smi_check_type,
+                              CompareMapMode mode) {
   if (smi_check_type == DO_SMI_CHECK) {
     JumpIfSmi(obj, fail);
   }
-  cmp(FieldOperand(obj, HeapObject::kMapOffset), Immediate(map));
+
+  Label success;
+  CompareMap(obj, map, &success, mode);
   j(not_equal, fail);
+  bind(&success);
 }
 
 
@@ -616,7 +649,7 @@ void MacroAssembler::LeaveFrame(StackFrame::Type type) {
 
 
 void MacroAssembler::EnterExitFramePrologue() {
-  // Setup the frame structure on the stack.
+  // Set up the frame structure on the stack.
   ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize);
   ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize);
   ASSERT(ExitFrameConstants::kCallerFPOffset ==  0 * kPointerSize);
@@ -668,7 +701,7 @@ void MacroAssembler::EnterExitFrameEpilogue(int argc, bool save_doubles) {
 void MacroAssembler::EnterExitFrame(bool save_doubles) {
   EnterExitFramePrologue();
 
-  // Setup argc and argv in callee-saved registers.
+  // Set up argc and argv in callee-saved registers.
   int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
   mov(edi, eax);
   lea(esi, Operand(ebp, eax, times_4, offset));
@@ -959,6 +992,50 @@ void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
 }
 
 
+// Compute the hash code from the untagged key.  This must be kept in sync
+// with ComputeIntegerHash in utils.h.
+//
+// Note: r0 will contain hash code
+void MacroAssembler::GetNumberHash(Register r0, Register scratch) {
+  // Xor original key with a seed.
+  if (Serializer::enabled()) {
+    ExternalReference roots_array_start =
+        ExternalReference::roots_array_start(isolate());
+    mov(scratch, Immediate(Heap::kHashSeedRootIndex));
+    mov(scratch,
+        Operand::StaticArray(scratch, times_pointer_size, roots_array_start));
+    SmiUntag(scratch);
+    xor_(r0, scratch);
+  } else {
+    int32_t seed = isolate()->heap()->HashSeed();
+    xor_(r0, Immediate(seed));
+  }
+
+  // hash = ~hash + (hash << 15);
+  mov(scratch, r0);
+  not_(r0);
+  shl(scratch, 15);
+  add(r0, scratch);
+  // hash = hash ^ (hash >> 12);
+  mov(scratch, r0);
+  shr(scratch, 12);
+  xor_(r0, scratch);
+  // hash = hash + (hash << 2);
+  lea(r0, Operand(r0, r0, times_4, 0));
+  // hash = hash ^ (hash >> 4);
+  mov(scratch, r0);
+  shr(scratch, 4);
+  xor_(r0, scratch);
+  // hash = hash * 2057;
+  imul(r0, r0, 2057);
+  // hash = hash ^ (hash >> 16);
+  mov(scratch, r0);
+  shr(scratch, 16);
+  xor_(r0, scratch);
+}
+
+
+
 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
                                               Register elements,
                                               Register key,
@@ -984,33 +1061,10 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
 
   Label done;
 
-  // Compute the hash code from the untagged key.  This must be kept in sync
-  // with ComputeIntegerHash in utils.h.
-  //
-  // hash = ~hash + (hash << 15);
-  mov(r1, r0);
-  not_(r0);
-  shl(r1, 15);
-  add(r0, r1);
-  // hash = hash ^ (hash >> 12);
-  mov(r1, r0);
-  shr(r1, 12);
-  xor_(r0, r1);
-  // hash = hash + (hash << 2);
-  lea(r0, Operand(r0, r0, times_4, 0));
-  // hash = hash ^ (hash >> 4);
-  mov(r1, r0);
-  shr(r1, 4);
-  xor_(r0, r1);
-  // hash = hash * 2057;
-  imul(r0, r0, 2057);
-  // hash = hash ^ (hash >> 16);
-  mov(r1, r0);
-  shr(r1, 16);
-  xor_(r0, r1);
+  GetNumberHash(r0, r1);
 
   // Compute capacity mask.
-  mov(r1, FieldOperand(elements, NumberDictionary::kCapacityOffset));
+  mov(r1, FieldOperand(elements, SeededNumberDictionary::kCapacityOffset));
   shr(r1, kSmiTagSize);  // convert smi to int
   dec(r1);
 
@@ -1021,19 +1075,19 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
     mov(r2, r0);
     // Compute the masked index: (hash + i + i * i) & mask.
     if (i > 0) {
-      add(r2, Immediate(NumberDictionary::GetProbeOffset(i)));
+      add(r2, Immediate(SeededNumberDictionary::GetProbeOffset(i)));
     }
     and_(r2, r1);
 
     // Scale the index by multiplying by the entry size.
-    ASSERT(NumberDictionary::kEntrySize == 3);
+    ASSERT(SeededNumberDictionary::kEntrySize == 3);
     lea(r2, Operand(r2, r2, times_2, 0));  // r2 = r2 * 3
 
     // Check if the key matches.
     cmp(key, FieldOperand(elements,
                           r2,
                           times_pointer_size,
-                          NumberDictionary::kElementsStartOffset));
+                          SeededNumberDictionary::kElementsStartOffset));
     if (i != (kProbes - 1)) {
       j(equal, &done);
     } else {
@@ -1044,7 +1098,7 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   bind(&done);
   // Check that the value is a normal propety.
   const int kDetailsOffset =
-      NumberDictionary::kElementsStartOffset + 2 * kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
   ASSERT_EQ(NORMAL, 0);
   test(FieldOperand(elements, r2, times_pointer_size, kDetailsOffset),
        Immediate(PropertyDetails::TypeField::kMask << kSmiTagSize));
@@ -1052,7 +1106,7 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
 
   // Get the value at the masked, scaled index.
   const int kValueOffset =
-      NumberDictionary::kElementsStartOffset + kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + kPointerSize;
   mov(result, FieldOperand(elements, r2, times_pointer_size, kValueOffset));
 }
 
diff --git a/deps/v8/src/ia32/macro-assembler-ia32.h b/deps/v8/src/ia32/macro-assembler-ia32.h
index e6a17417d..c969a6f71 100644
--- a/deps/v8/src/ia32/macro-assembler-ia32.h
+++ b/deps/v8/src/ia32/macro-assembler-ia32.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -251,7 +251,7 @@ class MacroAssembler: public Assembler {
   // ---------------------------------------------------------------------------
   // JavaScript invokes
 
-  // Setup call kind marking in ecx. The method takes ecx as an
+  // Set up call kind marking in ecx. The method takes ecx as an
   // explicit first parameter to make the code more readable at the
   // call sites.
   void SetCallKind(Register dst, CallKind kind);
@@ -356,13 +356,24 @@ class MacroAssembler: public Assembler {
                                    Label* fail,
                                    bool specialize_for_processor);
 
+  // Compare an object's map with the specified map and its transitioned
+  // elements maps if mode is ALLOW_ELEMENT_TRANSITION_MAPS. FLAGS are set with
+  // result of map compare. If multiple map compares are required, the compare
+  // sequences branches to early_success.
+  void CompareMap(Register obj,
+                  Handle<Map> map,
+                  Label* early_success,
+                  CompareMapMode mode = REQUIRE_EXACT_MAP);
+
   // Check if the map of an object is equal to a specified map and branch to
   // label if not. Skip the smi check if not required (object is known to be a
-  // heap object)
+  // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
+  // against maps that are ElementsKind transition maps of the specificed map.
   void CheckMap(Register obj,
                 Handle<Map> map,
                 Label* fail,
-                SmiCheckType smi_check_type);
+                SmiCheckType smi_check_type,
+                CompareMapMode mode = REQUIRE_EXACT_MAP);
 
   // Check if the map of an object is equal to a specified map and branch to a
   // specified target if equal. Skip the smi check if not required (object is
@@ -486,6 +497,7 @@ class MacroAssembler: public Assembler {
                               Register scratch,
                               Label* miss);
 
+  void GetNumberHash(Register r0, Register scratch);
 
   void LoadFromNumberDictionary(Label* miss,
                                 Register elements,
diff --git a/deps/v8/src/ia32/stub-cache-ia32.cc b/deps/v8/src/ia32/stub-cache-ia32.cc
index c27a60fd0..0da51c857 100644
--- a/deps/v8/src/ia32/stub-cache-ia32.cc
+++ b/deps/v8/src/ia32/stub-cache-ia32.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -695,13 +695,9 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
                                       Register name_reg,
                                       Register scratch,
                                       Label* miss_label) {
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(receiver_reg, miss_label);
-
   // Check that the map of the object hasn't changed.
-  __ cmp(FieldOperand(receiver_reg, HeapObject::kMapOffset),
-         Immediate(Handle<Map>(object->map())));
-  __ j(not_equal, miss_label);
+  __ CheckMap(receiver_reg, Handle<Map>(object->map()),
+              miss_label, DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -878,13 +874,10 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
       if (in_new_space) {
         // Save the map in scratch1 for later.
         __ mov(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
-        __ cmp(scratch1, Immediate(current_map));
-      } else {
-        __ cmp(FieldOperand(reg, HeapObject::kMapOffset),
-               Immediate(current_map));
       }
-      // Branch on the result of the map check.
-      __ j(not_equal, miss);
+      __ CheckMap(reg, current_map, miss, DONT_DO_SMI_CHECK,
+                  ALLOW_ELEMENT_TRANSITION_MAPS);
+
       // Check access rights to the global object.  This has to happen after
       // the map check so that we know that the object is actually a global
       // object.
@@ -916,9 +909,8 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
   LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
 
   // Check the holder map.
-  __ cmp(FieldOperand(reg, HeapObject::kMapOffset),
-         Immediate(Handle<Map>(holder->map())));
-  __ j(not_equal, miss);
+  __ CheckMap(reg, Handle<Map>(holder->map()),
+              miss, DONT_DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform security check for access to the global object.
   ASSERT(holder->IsJSGlobalProxy() || !holder->IsAccessCheckNeeded());
@@ -2338,7 +2330,7 @@ Handle<Code> CallStubCompiler::CompileCallGlobal(
     __ mov(Operand(esp, (argc + 1) * kPointerSize), edx);
   }
 
-  // Setup the context (function already in edi).
+  // Set up the context (function already in edi).
   __ mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
 
   // Jump to the cached code (tail call).
@@ -2403,13 +2395,9 @@ Handle<Code> StoreStubCompiler::CompileStoreCallback(
   // -----------------------------------
   Label miss;
 
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(edx, &miss);
-
   // Check that the map of the object hasn't changed.
-  __ cmp(FieldOperand(edx, HeapObject::kMapOffset),
-         Immediate(Handle<Map>(object->map())));
-  __ j(not_equal, &miss);
+  __ CheckMap(edx, Handle<Map>(object->map()),
+              &miss, DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -2453,13 +2441,9 @@ Handle<Code> StoreStubCompiler::CompileStoreInterceptor(
   // -----------------------------------
   Label miss;
 
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(edx, &miss);
-
   // Check that the map of the object hasn't changed.
-  __ cmp(FieldOperand(edx, HeapObject::kMapOffset),
-         Immediate(Handle<Map>(receiver->map())));
-  __ j(not_equal, &miss);
+  __ CheckMap(edx, Handle<Map>(receiver->map()),
+              &miss, DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (receiver->IsJSGlobalProxy()) {
diff --git a/deps/v8/src/ic.cc b/deps/v8/src/ic.cc
index 624ecd7f5..9024605da 100644
--- a/deps/v8/src/ic.cc
+++ b/deps/v8/src/ic.cc
@@ -1267,7 +1267,8 @@ MaybeObject* StoreIC::Store(State state,
   // Check if the given name is an array index.
   uint32_t index;
   if (name->AsArrayIndex(&index)) {
-    Handle<Object> result = SetElement(receiver, index, value, strict_mode);
+    Handle<Object> result =
+        JSObject::SetElement(receiver, index, value, strict_mode);
     RETURN_IF_EMPTY_HANDLE(isolate(), result);
     return *value;
   }
@@ -1644,7 +1645,8 @@ MaybeObject* KeyedStoreIC::Store(State state,
     // Check if the given name is an array index.
     uint32_t index;
     if (name->AsArrayIndex(&index)) {
-      Handle<Object> result = SetElement(receiver, index, value, strict_mode);
+      Handle<Object> result =
+          JSObject::SetElement(receiver, index, value, strict_mode);
       RETURN_IF_EMPTY_HANDLE(isolate(), result);
       return *value;
     }
diff --git a/deps/v8/src/incremental-marking.cc b/deps/v8/src/incremental-marking.cc
index 8fca30505..f6d5a5963 100644
--- a/deps/v8/src/incremental-marking.cc
+++ b/deps/v8/src/incremental-marking.cc
@@ -418,7 +418,7 @@ void IncrementalMarking::ActivateGeneratedStub(Code* stub) {
 
 static void PatchIncrementalMarkingRecordWriteStubs(
     Heap* heap, RecordWriteStub::Mode mode) {
-  NumberDictionary* stubs = heap->code_stubs();
+  UnseededNumberDictionary* stubs = heap->code_stubs();
 
   int capacity = stubs->Capacity();
   for (int i = 0; i < capacity; i++) {
diff --git a/deps/v8/src/incremental-marking.h b/deps/v8/src/incremental-marking.h
index 25def8706..4f8fa6b12 100644
--- a/deps/v8/src/incremental-marking.h
+++ b/deps/v8/src/incremental-marking.h
@@ -56,6 +56,7 @@ class IncrementalMarking {
   }
 
   bool should_hurry() { return should_hurry_; }
+  void set_should_hurry(bool val) { should_hurry_ = val; }
 
   inline bool IsStopped() { return state() == STOPPED; }
 
@@ -219,10 +220,6 @@ class IncrementalMarking {
   void UncommitMarkingDeque();
 
  private:
-  void set_should_hurry(bool val) {
-    should_hurry_ = val;
-  }
-
   int64_t SpaceLeftInOldSpace();
 
   void ResetStepCounters();
diff --git a/deps/v8/src/inspector.cc b/deps/v8/src/inspector.cc
index 8fb80f1a2..833d33843 100644
--- a/deps/v8/src/inspector.cc
+++ b/deps/v8/src/inspector.cc
@@ -38,11 +38,11 @@ namespace internal {
 //============================================================================
 // The Inspector.
 
-void Inspector::DumpObjectType(FILE* out, Object *obj, bool print_more) {
+void Inspector::DumpObjectType(FILE* out, Object* obj, bool print_more) {
   // Dump the object pointer.
   OS::FPrint(out, "%p:", reinterpret_cast<void*>(obj));
   if (obj->IsHeapObject()) {
-    HeapObject *hobj = HeapObject::cast(obj);
+    HeapObject* hobj = HeapObject::cast(obj);
     OS::FPrint(out, " size %d :", hobj->Size());
   }
 
diff --git a/deps/v8/src/inspector.h b/deps/v8/src/inspector.h
index e328bcdfa..6962e21f4 100644
--- a/deps/v8/src/inspector.h
+++ b/deps/v8/src/inspector.h
@@ -41,14 +41,14 @@ namespace internal {
 
 class Inspector {
  public:
-  static void DumpObjectType(FILE* out, Object *obj, bool print_more);
-  static void DumpObjectType(FILE* out, Object *obj) {
+  static void DumpObjectType(FILE* out, Object* obj, bool print_more);
+  static void DumpObjectType(FILE* out, Object* obj) {
     DumpObjectType(out, obj, false);
   }
-  static void DumpObjectType(Object *obj, bool print_more) {
+  static void DumpObjectType(Object* obj, bool print_more) {
     DumpObjectType(stdout, obj, print_more);
   }
-  static void DumpObjectType(Object *obj) {
+  static void DumpObjectType(Object* obj) {
     DumpObjectType(stdout, obj, false);
   }
 };
diff --git a/deps/v8/src/isolate.cc b/deps/v8/src/isolate.cc
index c235a2343..35e9e284f 100644
--- a/deps/v8/src/isolate.cc
+++ b/deps/v8/src/isolate.cc
@@ -570,7 +570,7 @@ Handle<JSArray> Isolate::CaptureCurrentStackTrace(
     frame->Summarize(&frames);
     for (int i = frames.length() - 1; i >= 0 && frames_seen < limit; i--) {
       // Create a JSObject to hold the information for the StackFrame.
-      Handle<JSObject> stackFrame = factory()->NewJSObject(object_function());
+      Handle<JSObject> stack_frame = factory()->NewJSObject(object_function());
 
       Handle<JSFunction> fun = frames[i].function();
       Handle<Script> script(Script::cast(fun->shared()->script()));
@@ -591,16 +591,24 @@ Handle<JSArray> Isolate::CaptureCurrentStackTrace(
             // tag.
             column_offset += script->column_offset()->value();
           }
-          SetLocalPropertyNoThrow(stackFrame, column_key,
-                                  Handle<Smi>(Smi::FromInt(column_offset + 1)));
+          CHECK_NOT_EMPTY_HANDLE(
+              this,
+              JSObject::SetLocalPropertyIgnoreAttributes(
+                  stack_frame, column_key,
+                  Handle<Smi>(Smi::FromInt(column_offset + 1)), NONE));
         }
-        SetLocalPropertyNoThrow(stackFrame, line_key,
-                                Handle<Smi>(Smi::FromInt(line_number + 1)));
+        CHECK_NOT_EMPTY_HANDLE(
+            this,
+            JSObject::SetLocalPropertyIgnoreAttributes(
+                stack_frame, line_key,
+                Handle<Smi>(Smi::FromInt(line_number + 1)), NONE));
       }
 
       if (options & StackTrace::kScriptName) {
         Handle<Object> script_name(script->name(), this);
-        SetLocalPropertyNoThrow(stackFrame, script_key, script_name);
+        CHECK_NOT_EMPTY_HANDLE(this,
+                               JSObject::SetLocalPropertyIgnoreAttributes(
+                                   stack_frame, script_key, script_name, NONE));
       }
 
       if (options & StackTrace::kScriptNameOrSourceURL) {
@@ -616,8 +624,10 @@ Handle<JSArray> Isolate::CaptureCurrentStackTrace(
         if (caught_exception) {
           result = factory()->undefined_value();
         }
-        SetLocalPropertyNoThrow(stackFrame, script_name_or_source_url_key,
-                                result);
+        CHECK_NOT_EMPTY_HANDLE(this,
+                               JSObject::SetLocalPropertyIgnoreAttributes(
+                                   stack_frame, script_name_or_source_url_key,
+                                   result, NONE));
       }
 
       if (options & StackTrace::kFunctionName) {
@@ -625,23 +635,30 @@ Handle<JSArray> Isolate::CaptureCurrentStackTrace(
         if (fun_name->ToBoolean()->IsFalse()) {
           fun_name = Handle<Object>(fun->shared()->inferred_name(), this);
         }
-        SetLocalPropertyNoThrow(stackFrame, function_key, fun_name);
+        CHECK_NOT_EMPTY_HANDLE(this,
+                               JSObject::SetLocalPropertyIgnoreAttributes(
+                                   stack_frame, function_key, fun_name, NONE));
       }
 
       if (options & StackTrace::kIsEval) {
         int type = Smi::cast(script->compilation_type())->value();
         Handle<Object> is_eval = (type == Script::COMPILATION_TYPE_EVAL) ?
             factory()->true_value() : factory()->false_value();
-        SetLocalPropertyNoThrow(stackFrame, eval_key, is_eval);
+        CHECK_NOT_EMPTY_HANDLE(this,
+                               JSObject::SetLocalPropertyIgnoreAttributes(
+                                   stack_frame, eval_key, is_eval, NONE));
       }
 
       if (options & StackTrace::kIsConstructor) {
         Handle<Object> is_constructor = (frames[i].is_constructor()) ?
             factory()->true_value() : factory()->false_value();
-        SetLocalPropertyNoThrow(stackFrame, constructor_key, is_constructor);
+        CHECK_NOT_EMPTY_HANDLE(this,
+                               JSObject::SetLocalPropertyIgnoreAttributes(
+                                   stack_frame, constructor_key,
+                                   is_constructor, NONE));
       }
 
-      FixedArray::cast(stack_trace->elements())->set(frames_seen, *stackFrame);
+      FixedArray::cast(stack_trace->elements())->set(frames_seen, *stack_frame);
       frames_seen++;
     }
     it.Advance();
@@ -1734,10 +1751,10 @@ bool Isolate::Init(Deserializer* des) {
   regexp_stack_->isolate_ = this;
 
   // Enable logging before setting up the heap
-  logger_->Setup();
+  logger_->SetUp();
 
-  CpuProfiler::Setup();
-  HeapProfiler::Setup();
+  CpuProfiler::SetUp();
+  HeapProfiler::SetUp();
 
   // Initialize other runtime facilities
 #if defined(USE_SIMULATOR)
@@ -1754,10 +1771,10 @@ bool Isolate::Init(Deserializer* des) {
     stack_guard_.InitThread(lock);
   }
 
-  // Setup the object heap.
+  // SetUp the object heap.
   const bool create_heap_objects = (des == NULL);
-  ASSERT(!heap_.HasBeenSetup());
-  if (!heap_.Setup(create_heap_objects)) {
+  ASSERT(!heap_.HasBeenSetUp());
+  if (!heap_.SetUp(create_heap_objects)) {
     V8::SetFatalError();
     return false;
   }
@@ -1765,7 +1782,7 @@ bool Isolate::Init(Deserializer* des) {
   InitializeThreadLocal();
 
   bootstrapper_->Initialize(create_heap_objects);
-  builtins_.Setup(create_heap_objects);
+  builtins_.SetUp(create_heap_objects);
 
   // Only preallocate on the first initialization.
   if (FLAG_preallocate_message_memory && preallocated_message_space_ == NULL) {
@@ -1784,7 +1801,7 @@ bool Isolate::Init(Deserializer* des) {
   }
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
-  debug_->Setup(create_heap_objects);
+  debug_->SetUp(create_heap_objects);
 #endif
   stub_cache_->Initialize(create_heap_objects);
 
@@ -1805,7 +1822,7 @@ bool Isolate::Init(Deserializer* des) {
 
   deoptimizer_data_ = new DeoptimizerData;
   runtime_profiler_ = new RuntimeProfiler(this);
-  runtime_profiler_->Setup();
+  runtime_profiler_->SetUp();
 
   // If we are deserializing, log non-function code objects and compiled
   // functions found in the snapshot.
diff --git a/deps/v8/src/isolate.h b/deps/v8/src/isolate.h
index c044e1f57..4e5c7dbf5 100644
--- a/deps/v8/src/isolate.h
+++ b/deps/v8/src/isolate.h
@@ -122,6 +122,13 @@ typedef ZoneList<Handle<Object> > ZoneObjectList;
     }                                                      \
   } while (false)
 
+#define CHECK_NOT_EMPTY_HANDLE(isolate, call)     \
+  do {                                            \
+    ASSERT(!(isolate)->has_pending_exception());  \
+    CHECK(!(call).is_null());                     \
+    CHECK(!(isolate)->has_pending_exception());   \
+  } while (false)
+
 #define RETURN_IF_EMPTY_HANDLE(isolate, call)                       \
   RETURN_IF_EMPTY_HANDLE_VALUE(isolate, call, Failure::Exception())
 
diff --git a/deps/v8/src/json-parser.h b/deps/v8/src/json-parser.h
index ca796a699..2b7077e19 100644
--- a/deps/v8/src/json-parser.h
+++ b/deps/v8/src/json-parser.h
@@ -303,11 +303,12 @@ Handle<Object> JsonParser<seq_ascii>::ParseJsonObject() {
 
       uint32_t index;
       if (key->AsArrayIndex(&index)) {
-        SetOwnElement(json_object, index, value, kNonStrictMode);
+        JSObject::SetOwnElement(json_object, index, value, kNonStrictMode);
       } else if (key->Equals(isolate()->heap()->Proto_symbol())) {
         SetPrototype(json_object, value);
       } else {
-        SetLocalPropertyIgnoreAttributes(json_object, key, value, NONE);
+        JSObject::SetLocalPropertyIgnoreAttributes(
+            json_object, key, value, NONE);
       }
     } while (MatchSkipWhiteSpace(','));
     if (c0_ != '}') {
diff --git a/deps/v8/src/jsregexp.cc b/deps/v8/src/jsregexp.cc
index 18ff2570e..15b80d92c 100644
--- a/deps/v8/src/jsregexp.cc
+++ b/deps/v8/src/jsregexp.cc
@@ -2636,7 +2636,7 @@ void TextNode::MakeCaseIndependent(bool is_ascii) {
     TextElement elm = elms_->at(i);
     if (elm.type == TextElement::CHAR_CLASS) {
       RegExpCharacterClass* cc = elm.data.u_char_class;
-      // None of the standard character classses is different in the case
+      // None of the standard character classes is different in the case
       // independent case and it slows us down if we don't know that.
       if (cc->is_standard()) continue;
       ZoneList<CharacterRange>* ranges = cc->ranges();
diff --git a/deps/v8/src/lithium-allocator.cc b/deps/v8/src/lithium-allocator.cc
index c4d8b1e5b..1601dcf14 100644
--- a/deps/v8/src/lithium-allocator.cc
+++ b/deps/v8/src/lithium-allocator.cc
@@ -49,13 +49,13 @@ namespace internal {
 
 #define DEFINE_OPERAND_CACHE(name, type)                      \
   name name::cache[name::kNumCachedOperands];                 \
-  void name::SetupCache() {                                   \
+  void name::SetUpCache() {                                   \
     for (int i = 0; i < kNumCachedOperands; i++) {            \
       cache[i].ConvertTo(type, i);                            \
     }                                                         \
   }                                                           \
   static bool name##_initialize() {                           \
-    name::SetupCache();                                       \
+    name::SetUpCache();                                       \
     return true;                                              \
   }                                                           \
   static bool name##_cache_initialized = name##_initialize();
diff --git a/deps/v8/src/lithium.h b/deps/v8/src/lithium.h
index b605eb97b..325352009 100644
--- a/deps/v8/src/lithium.h
+++ b/deps/v8/src/lithium.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -265,7 +265,7 @@ class LConstantOperand: public LOperand {
     return reinterpret_cast<LConstantOperand*>(op);
   }
 
-  static void SetupCache();
+  static void SetUpCache();
 
  private:
   static const int kNumCachedOperands = 128;
@@ -300,7 +300,7 @@ class LStackSlot: public LOperand {
     return reinterpret_cast<LStackSlot*>(op);
   }
 
-  static void SetupCache();
+  static void SetUpCache();
 
  private:
   static const int kNumCachedOperands = 128;
@@ -324,7 +324,7 @@ class LDoubleStackSlot: public LOperand {
     return reinterpret_cast<LDoubleStackSlot*>(op);
   }
 
-  static void SetupCache();
+  static void SetUpCache();
 
  private:
   static const int kNumCachedOperands = 128;
@@ -348,7 +348,7 @@ class LRegister: public LOperand {
     return reinterpret_cast<LRegister*>(op);
   }
 
-  static void SetupCache();
+  static void SetUpCache();
 
  private:
   static const int kNumCachedOperands = 16;
@@ -372,7 +372,7 @@ class LDoubleRegister: public LOperand {
     return reinterpret_cast<LDoubleRegister*>(op);
   }
 
-  static void SetupCache();
+  static void SetUpCache();
 
  private:
   static const int kNumCachedOperands = 16;
@@ -523,8 +523,6 @@ class LEnvironment: public ZoneObject {
   LOperand** spilled_double_registers_;
 
   LEnvironment* outer_;
-
-  friend class LCodegen;
 };
 
 
diff --git a/deps/v8/src/liveedit.cc b/deps/v8/src/liveedit.cc
index eb183dac5..5ff8ff9d3 100644
--- a/deps/v8/src/liveedit.cc
+++ b/deps/v8/src/liveedit.cc
@@ -54,7 +54,7 @@ void SetElementNonStrict(Handle<JSObject> object,
   // are element setters causing exceptions and the debugger context has none
   // of these.
   Handle<Object> no_failure;
-  no_failure = SetElement(object, index, value, kNonStrictMode);
+  no_failure = JSObject::SetElement(object, index, value, kNonStrictMode);
   ASSERT(!no_failure.is_null());
   USE(no_failure);
 }
@@ -1228,7 +1228,7 @@ class RelocInfoBuffer {
       V8::FatalProcessOutOfMemory("RelocInfoBuffer::GrowBuffer");
     }
 
-    // Setup new buffer.
+    // Set up new buffer.
     byte* new_buffer = NewArray<byte>(new_buffer_size);
 
     // Copy the data.
diff --git a/deps/v8/src/liveobjectlist-inl.h b/deps/v8/src/liveobjectlist-inl.h
index f742de3a0..2bc2296e2 100644
--- a/deps/v8/src/liveobjectlist-inl.h
+++ b/deps/v8/src/liveobjectlist-inl.h
@@ -59,7 +59,7 @@ void LiveObjectList::IterateElements(ObjectVisitor* v) {
 }
 
 
-void LiveObjectList::ProcessNonLive(HeapObject *obj) {
+void LiveObjectList::ProcessNonLive(HeapObject* obj) {
   // Only do work if we have at least one list to process.
   if (last()) DoProcessNonLive(obj);
 }
@@ -93,7 +93,7 @@ LiveObjectList* LiveObjectList::FindLolForId(int id,
 template <typename T>
 inline LiveObjectList::Element*
 LiveObjectList::FindElementFor(T (*GetValue)(LiveObjectList::Element*), T key) {
-  LiveObjectList *lol = last();
+  LiveObjectList* lol = last();
   while (lol != NULL) {
     Element* elements = lol->elements_;
     for (int i = 0; i < lol->obj_count_; i++) {
diff --git a/deps/v8/src/liveobjectlist.cc b/deps/v8/src/liveobjectlist.cc
index 408e2a316..436204e3f 100644
--- a/deps/v8/src/liveobjectlist.cc
+++ b/deps/v8/src/liveobjectlist.cc
@@ -165,7 +165,7 @@ const char* GetObjectTypeDesc(HeapObject* heap_obj) {
 }
 
 
-bool IsOfType(LiveObjectType type, HeapObject *obj) {
+bool IsOfType(LiveObjectType type, HeapObject* obj) {
   // Note: there are types that are more general (e.g. JSObject) that would
   // have passed the Is##type_() test for more specialized types (e.g.
   // JSFunction).  If we find a more specialized match but we're looking for
@@ -211,7 +211,7 @@ static AllocationSpace FindSpaceFor(String* space_str) {
 }
 
 
-static bool InSpace(AllocationSpace space, HeapObject *heap_obj) {
+static bool InSpace(AllocationSpace space, HeapObject* heap_obj) {
   Heap* heap = ISOLATE->heap();
   if (space != LO_SPACE) {
     return heap->InSpace(heap_obj, space);
@@ -498,7 +498,7 @@ static void GenerateObjectDesc(HeapObject* obj,
                  length);
 
   } else if (obj->IsString()) {
-    String *str = String::cast(obj);
+    String* str = String::cast(obj);
     // Only grab up to 160 chars in case they are double byte.
     // We'll only dump 80 of them after we compact them.
     const int kMaxCharToDump = 80;
@@ -842,7 +842,7 @@ class LiveObjectSummary {
   bool found_root_;
   bool found_weak_root_;
 
-  LolFilter *filter_;
+  LolFilter* filter_;
 };
 
 
@@ -857,8 +857,8 @@ class SummaryWriter {
 // A summary writer for filling in a summary of lol lists and diffs.
 class LolSummaryWriter: public SummaryWriter {
  public:
-  LolSummaryWriter(LiveObjectList *older_lol,
-                   LiveObjectList *newer_lol)
+  LolSummaryWriter(LiveObjectList* older_lol,
+                   LiveObjectList* newer_lol)
       : older_(older_lol), newer_(newer_lol) {
   }
 
@@ -944,7 +944,7 @@ LiveObjectList::~LiveObjectList() {
 int LiveObjectList::GetTotalObjCountAndSize(int* size_p) {
   int size = 0;
   int count = 0;
-  LiveObjectList *lol = this;
+  LiveObjectList* lol = this;
   do {
     // Only compute total size if requested i.e. when size_p is not null.
     if (size_p != NULL) {
@@ -1183,7 +1183,7 @@ MaybeObject* LiveObjectList::Capture() {
 // only time we'll actually delete the lol is when we Reset() or if the lol is
 // invisible, and its element count reaches 0.
 bool LiveObjectList::Delete(int id) {
-  LiveObjectList *lol = last();
+  LiveObjectList* lol = last();
   while (lol != NULL) {
     if (lol->id() == id) {
       break;
@@ -1246,8 +1246,8 @@ MaybeObject* LiveObjectList::Dump(int older_id,
     newer_id = temp;
   }
 
-  LiveObjectList *newer_lol = FindLolForId(newer_id, last());
-  LiveObjectList *older_lol = FindLolForId(older_id, newer_lol);
+  LiveObjectList* newer_lol = FindLolForId(newer_id, last());
+  LiveObjectList* older_lol = FindLolForId(older_id, newer_lol);
 
   // If the id is defined, and we can't find a LOL for it, then we have an
   // invalid id.
@@ -1365,8 +1365,8 @@ MaybeObject* LiveObjectList::Summarize(int older_id,
     newer_id = temp;
   }
 
-  LiveObjectList *newer_lol = FindLolForId(newer_id, last());
-  LiveObjectList *older_lol = FindLolForId(older_id, newer_lol);
+  LiveObjectList* newer_lol = FindLolForId(newer_id, last());
+  LiveObjectList* older_lol = FindLolForId(older_id, newer_lol);
 
   // If the id is defined, and we can't find a LOL for it, then we have an
   // invalid id.
@@ -1626,7 +1626,7 @@ MaybeObject* LiveObjectList::Info(int start_idx, int dump_limit) {
 
 // Deletes all captured lols.
 void LiveObjectList::Reset() {
-  LiveObjectList *lol = last();
+  LiveObjectList* lol = last();
   // Just delete the last.  Each lol will delete it's prev automatically.
   delete lol;
 
@@ -1715,8 +1715,8 @@ class LolVisitor: public ObjectVisitor {
 
 inline bool AddRootRetainerIfFound(const LolVisitor& visitor,
                                    LolFilter* filter,
-                                   LiveObjectSummary *summary,
-                                   void (*SetRootFound)(LiveObjectSummary *s),
+                                   LiveObjectSummary* summary,
+                                   void (*SetRootFound)(LiveObjectSummary* s),
                                    int start,
                                    int dump_limit,
                                    int* total_count,
@@ -1762,12 +1762,12 @@ inline bool AddRootRetainerIfFound(const LolVisitor& visitor,
 }
 
 
-inline void SetFoundRoot(LiveObjectSummary *summary) {
+inline void SetFoundRoot(LiveObjectSummary* summary) {
   summary->set_found_root();
 }
 
 
-inline void SetFoundWeakRoot(LiveObjectSummary *summary) {
+inline void SetFoundWeakRoot(LiveObjectSummary* summary) {
   summary->set_found_weak_root();
 }
 
@@ -1779,7 +1779,7 @@ int LiveObjectList::GetRetainers(Handle<HeapObject> target,
                                  int dump_limit,
                                  int* total_count,
                                  LolFilter* filter,
-                                 LiveObjectSummary *summary,
+                                 LiveObjectSummary* summary,
                                  JSFunction* arguments_function,
                                  Handle<Object> error) {
   HandleScope scope;
@@ -2267,7 +2267,7 @@ Object* LiveObjectList::GetPath(int obj_id1,
 }
 
 
-void LiveObjectList::DoProcessNonLive(HeapObject *obj) {
+void LiveObjectList::DoProcessNonLive(HeapObject* obj) {
   // We should only be called if we have at least one lol to search.
   ASSERT(last() != NULL);
   Element* element = last()->Find(obj);
@@ -2284,7 +2284,7 @@ void LiveObjectList::IterateElementsPrivate(ObjectVisitor* v) {
     int count = lol->obj_count_;
     for (int i = 0; i < count; i++) {
       HeapObject** p = &elements[i].obj_;
-      v->VisitPointer(reinterpret_cast<Object **>(p));
+      v->VisitPointer(reinterpret_cast<Object** >(p));
     }
     lol = lol->prev_;
   }
@@ -2389,11 +2389,11 @@ void LiveObjectList::GCEpiloguePrivate() {
   PurgeDuplicates();
 
   // After the GC, sweep away all free'd Elements and compact.
-  LiveObjectList *prev = NULL;
-  LiveObjectList *next = NULL;
+  LiveObjectList* prev = NULL;
+  LiveObjectList* next = NULL;
 
   // Iterating from the youngest lol to the oldest lol.
-  for (LiveObjectList *lol = last(); lol; lol = prev) {
+  for (LiveObjectList* lol = last(); lol; lol = prev) {
     Element* elements = lol->elements_;
     prev = lol->prev();  // Save the prev.
 
@@ -2446,7 +2446,7 @@ void LiveObjectList::GCEpiloguePrivate() {
       const int kMaxUnusedSpace = 64;
       if (diff > kMaxUnusedSpace) {  // Threshold for shrinking.
         // Shrink the list.
-        Element *new_elements = NewArray<Element>(new_count);
+        Element* new_elements = NewArray<Element>(new_count);
         memcpy(new_elements, elements, new_count * sizeof(Element));
 
         DeleteArray<Element>(elements);
diff --git a/deps/v8/src/liveobjectlist.h b/deps/v8/src/liveobjectlist.h
index 65470d7ad..1aa919605 100644
--- a/deps/v8/src/liveobjectlist.h
+++ b/deps/v8/src/liveobjectlist.h
@@ -77,7 +77,7 @@ class LiveObjectList {
   inline static void GCEpilogue();
   inline static void GCPrologue();
   inline static void IterateElements(ObjectVisitor* v);
-  inline static void ProcessNonLive(HeapObject *obj);
+  inline static void ProcessNonLive(HeapObject* obj);
   inline static void UpdateReferencesForScavengeGC();
 
   // Note: LOLs can be listed by calling Dump(0, <lol id>), and 2 LOLs can be
@@ -125,7 +125,7 @@ class LiveObjectList {
   static void GCEpiloguePrivate();
   static void IterateElementsPrivate(ObjectVisitor* v);
 
-  static void DoProcessNonLive(HeapObject *obj);
+  static void DoProcessNonLive(HeapObject* obj);
 
   static int CompareElement(const Element* a, const Element* b);
 
@@ -138,7 +138,7 @@ class LiveObjectList {
                           int dump_limit,
                           int* total_count,
                           LolFilter* filter,
-                          LiveObjectSummary *summary,
+                          LiveObjectSummary* summary,
                           JSFunction* arguments_function,
                           Handle<Object> error);
 
@@ -151,7 +151,7 @@ class LiveObjectList {
                                        bool is_tracking_roots);
 
   static bool NeedLOLProcessing() { return (last() != NULL); }
-  static void NullifyNonLivePointer(HeapObject **p) {
+  static void NullifyNonLivePointer(HeapObject** p) {
     // Mask out the low bit that marks this as a heap object.  We'll use this
     // cleared bit as an indicator that this pointer needs to be collected.
     //
@@ -202,7 +202,7 @@ class LiveObjectList {
   int id_;
   int capacity_;
   int obj_count_;
-  Element *elements_;
+  Element* elements_;
 
   // Statics for managing all the lists.
   static uint32_t next_element_id_;
diff --git a/deps/v8/src/log.cc b/deps/v8/src/log.cc
index eab26392e..5e82872da 100644
--- a/deps/v8/src/log.cc
+++ b/deps/v8/src/log.cc
@@ -1615,7 +1615,7 @@ void Logger::LogAccessorCallbacks() {
 }
 
 
-bool Logger::Setup() {
+bool Logger::SetUp() {
   // Tests and EnsureInitialize() can call this twice in a row. It's harmless.
   if (is_initialized_) return true;
   is_initialized_ = true;
@@ -1708,9 +1708,9 @@ FILE* Logger::TearDown() {
 
 
 void Logger::EnableSlidingStateWindow() {
-  // If the ticker is NULL, Logger::Setup has not been called yet.  In
+  // If the ticker is NULL, Logger::SetUp has not been called yet.  In
   // that case, we set the sliding_state_window flag so that the
-  // sliding window computation will be started when Logger::Setup is
+  // sliding window computation will be started when Logger::SetUp is
   // called.
   if (ticker_ == NULL) {
     FLAG_sliding_state_window = true;
diff --git a/deps/v8/src/log.h b/deps/v8/src/log.h
index 677dada03..86bcad69a 100644
--- a/deps/v8/src/log.h
+++ b/deps/v8/src/log.h
@@ -150,14 +150,14 @@ class Logger {
 #undef DECLARE_ENUM
 
   // Acquires resources for logging if the right flags are set.
-  bool Setup();
+  bool SetUp();
 
   void EnsureTickerStarted();
   void EnsureTickerStopped();
 
   Sampler* sampler();
 
-  // Frees resources acquired in Setup.
+  // Frees resources acquired in SetUp.
   // When a temporary file is used for the log, returns its stream descriptor,
   // leaving the file open.
   FILE* TearDown();
@@ -411,7 +411,7 @@ class Logger {
   NameMap* address_to_name_map_;
 
   // Guards against multiple calls to TearDown() that can happen in some tests.
-  // 'true' between Setup() and TearDown().
+  // 'true' between SetUp() and TearDown().
   bool is_initialized_;
 
   // Support for 'incremental addresses' in compressed logs:
diff --git a/deps/v8/src/mark-compact.cc b/deps/v8/src/mark-compact.cc
index 1fb5d5f43..6d7fbdff2 100644
--- a/deps/v8/src/mark-compact.cc
+++ b/deps/v8/src/mark-compact.cc
@@ -3641,6 +3641,7 @@ void MarkCompactCollector::SweepSpace(PagedSpace* space, SweeperType sweeper) {
         PrintF("Sweeping 0x%" V8PRIxPTR " lazily postponed.\n",
                reinterpret_cast<intptr_t>(p));
       }
+      space->MarkPageForLazySweeping(p);
       continue;
     }
 
diff --git a/deps/v8/src/mips/assembler-mips-inl.h b/deps/v8/src/mips/assembler-mips-inl.h
index 2ba9760e2..0788e73ef 100644
--- a/deps/v8/src/mips/assembler-mips-inl.h
+++ b/deps/v8/src/mips/assembler-mips-inl.h
@@ -133,7 +133,7 @@ Object* RelocInfo::target_object() {
 }
 
 
-Handle<Object> RelocInfo::target_object_handle(Assembler *origin) {
+Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   return Handle<Object>(reinterpret_cast<Object**>(
       Assembler::target_address_at(pc_)));
diff --git a/deps/v8/src/mips/assembler-mips.cc b/deps/v8/src/mips/assembler-mips.cc
index e933181d4..85b6ed802 100644
--- a/deps/v8/src/mips/assembler-mips.cc
+++ b/deps/v8/src/mips/assembler-mips.cc
@@ -301,7 +301,7 @@ Assembler::Assembler(Isolate* arg_isolate, void* buffer, int buffer_size)
     own_buffer_ = false;
   }
 
-  // Setup buffer pointers.
+  // Set up buffer pointers.
   ASSERT(buffer_ != NULL);
   pc_ = buffer_;
   reloc_info_writer.Reposition(buffer_ + buffer_size, pc_);
@@ -337,7 +337,7 @@ Assembler::~Assembler() {
 
 void Assembler::GetCode(CodeDesc* desc) {
   ASSERT(pc_ <= reloc_info_writer.pos());  // No overlap.
-  // Setup code descriptor.
+  // Set up code descriptor.
   desc->buffer = buffer_;
   desc->buffer_size = buffer_size_;
   desc->instr_size = pc_offset();
@@ -1970,7 +1970,7 @@ void Assembler::GrowBuffer() {
   }
   CHECK_GT(desc.buffer_size, 0);  // No overflow.
 
-  // Setup new buffer.
+  // Set up new buffer.
   desc.buffer = NewArray<byte>(desc.buffer_size);
 
   desc.instr_size = pc_offset();
diff --git a/deps/v8/src/mips/builtins-mips.cc b/deps/v8/src/mips/builtins-mips.cc
index 46a912bd5..9e108c9d1 100644
--- a/deps/v8/src/mips/builtins-mips.cc
+++ b/deps/v8/src/mips/builtins-mips.cc
@@ -339,7 +339,7 @@ static void ArrayNativeCode(MacroAssembler* masm,
                        t1,
                        call_generic_code);
   __ IncrementCounter(counters->array_function_native(), 1, a3, t0);
-  // Setup return value, remove receiver from stack and return.
+  // Set up return value, remove receiver from stack and return.
   __ mov(v0, a2);
   __ Addu(sp, sp, Operand(kPointerSize));
   __ Ret();
@@ -382,7 +382,7 @@ static void ArrayNativeCode(MacroAssembler* masm,
                   call_generic_code);
   __ IncrementCounter(counters->array_function_native(), 1, a2, t0);
 
-  // Setup return value, remove receiver and argument from stack and return.
+  // Set up return value, remove receiver and argument from stack and return.
   __ mov(v0, a3);
   __ Addu(sp, sp, Operand(2 * kPointerSize));
   __ Ret();
@@ -981,10 +981,10 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // sp[4]: number of arguments (smi-tagged)
     __ lw(a3, MemOperand(sp, 4 * kPointerSize));
 
-    // Setup pointer to last argument.
+    // Set up pointer to last argument.
     __ Addu(a2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
 
-    // Setup number of arguments for function call below.
+    // Set up number of arguments for function call below.
     __ srl(a0, a3, kSmiTagSize);
 
     // Copy arguments and receiver to the expression stack.
@@ -1114,10 +1114,7 @@ static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
     // Set up the context from the function argument.
     __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
-    // Set up the roots register.
-    ExternalReference roots_array_start =
-        ExternalReference::roots_array_start(masm->isolate());
-    __ li(s6, Operand(roots_array_start));
+    __ InitializeRootRegister();
 
     // Push the function and the receiver onto the stack.
     __ Push(a1, a2);
diff --git a/deps/v8/src/mips/code-stubs-mips.cc b/deps/v8/src/mips/code-stubs-mips.cc
index 3e811bd7c..57091ef60 100644
--- a/deps/v8/src/mips/code-stubs-mips.cc
+++ b/deps/v8/src/mips/code-stubs-mips.cc
@@ -157,13 +157,13 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
   // Load the function from the stack.
   __ lw(a3, MemOperand(sp, 0));
 
-  // Setup the object header.
+  // Set up the object header.
   __ LoadRoot(a2, Heap::kFunctionContextMapRootIndex);
   __ sw(a2, FieldMemOperand(v0, HeapObject::kMapOffset));
   __ li(a2, Operand(Smi::FromInt(length)));
   __ sw(a2, FieldMemOperand(v0, FixedArray::kLengthOffset));
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ li(a1, Operand(Smi::FromInt(0)));
   __ sw(a3, MemOperand(v0, Context::SlotOffset(Context::CLOSURE_INDEX)));
   __ sw(cp, MemOperand(v0, Context::SlotOffset(Context::PREVIOUS_INDEX)));
@@ -208,7 +208,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   // Load the serialized scope info from the stack.
   __ lw(a1, MemOperand(sp, 1 * kPointerSize));
 
-  // Setup the object header.
+  // Set up the object header.
   __ LoadRoot(a2, Heap::kBlockContextMapRootIndex);
   __ sw(a2, FieldMemOperand(v0, HeapObject::kMapOffset));
   __ li(a2, Operand(Smi::FromInt(length)));
@@ -229,7 +229,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   __ lw(a3, ContextOperand(a3, Context::CLOSURE_INDEX));
   __ bind(&after_sentinel);
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ sw(a3, ContextOperand(v0, Context::CLOSURE_INDEX));
   __ sw(cp, ContextOperand(v0, Context::PREVIOUS_INDEX));
   __ sw(a1, ContextOperand(v0, Context::EXTENSION_INDEX));
@@ -726,7 +726,7 @@ void FloatingPointHelper::ConvertIntToDouble(MacroAssembler* masm,
     __ Subu(int_scratch, zero_reg, int_scratch);
     __ bind(&skip_sub);
 
-    // Get mantisssa[51:20].
+    // Get mantissa[51:20].
 
     // Get the position of the first set bit.
     __ clz(dst1, int_scratch);
@@ -971,7 +971,7 @@ void FloatingPointHelper::DoubleIs32BitInteger(MacroAssembler* masm,
   // non zero bits left. So we need the (30 - exponent) last bits of the
   // 31 higher bits of the mantissa to be null.
   // Because bits [21:0] are null, we can check instead that the
-  // (32 - exponent) last bits of the 32 higher bits of the mantisssa are null.
+  // (32 - exponent) last bits of the 32 higher bits of the mantissa are null.
 
   // Get the 32 higher bits of the mantissa in dst.
   __ Ext(dst,
@@ -4005,7 +4005,7 @@ void CEntryStub::Generate(MacroAssembler* masm) {
   FrameScope scope(masm, StackFrame::MANUAL);
   __ EnterExitFrame(save_doubles_);
 
-  // Setup argc and the builtin function in callee-saved registers.
+  // Set up argc and the builtin function in callee-saved registers.
   __ mov(s0, a0);
   __ mov(s2, a1);
 
@@ -4097,7 +4097,7 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
                                       isolate)));
   __ lw(t0, MemOperand(t0));
   __ Push(t3, t2, t1, t0);
-  // Setup frame pointer for the frame to be pushed.
+  // Set up frame pointer for the frame to be pushed.
   __ addiu(fp, sp, -EntryFrameConstants::kCallerFPOffset);
 
   // Registers:
@@ -4584,7 +4584,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
     __ sw(a3, FieldMemOperand(v0, i));
   }
 
-  // Setup the callee in-object property.
+  // Set up the callee in-object property.
   STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
   __ lw(a3, MemOperand(sp, 2 * kPointerSize));
   const int kCalleeOffset = JSObject::kHeaderSize +
@@ -4597,7 +4597,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
       Heap::kArgumentsLengthIndex * kPointerSize;
   __ sw(a2, FieldMemOperand(v0, kLengthOffset));
 
-  // Setup the elements pointer in the allocated arguments object.
+  // Set up the elements pointer in the allocated arguments object.
   // If we allocated a parameter map, t0 will point there, otherwise
   // it will point to the backing store.
   __ Addu(t0, v0, Operand(Heap::kArgumentsObjectSize));
@@ -4699,7 +4699,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
   __ Ret();
 
   // Do the runtime call to allocate the arguments object.
-  // a2 = argument count (taggged)
+  // a2 = argument count (tagged)
   __ bind(&runtime);
   __ sw(a2, MemOperand(sp, 0 * kPointerSize));  // Patch argument count.
   __ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1);
@@ -4774,7 +4774,7 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
   // Get the parameters pointer from the stack.
   __ lw(a2, MemOperand(sp, 1 * kPointerSize));
 
-  // Setup the elements pointer in the allocated arguments object and
+  // Set up the elements pointer in the allocated arguments object and
   // initialize the header in the elements fixed array.
   __ Addu(t0, v0, Operand(Heap::kArgumentsObjectSizeStrict));
   __ sw(t0, FieldMemOperand(v0, JSObject::kElementsOffset));
@@ -4786,7 +4786,7 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
 
   // Copy the fixed array slots.
   Label loop;
-  // Setup t0 to point to the first array slot.
+  // Set up t0 to point to the first array slot.
   __ Addu(t0, t0, Operand(FixedArray::kHeaderSize - kHeapObjectTag));
   __ bind(&loop);
   // Pre-decrement a2 with kPointerSize on each iteration.
@@ -5425,7 +5425,7 @@ void CallFunctionStub::Generate(MacroAssembler* masm) {
   // of the original receiver from the call site).
   __ bind(&non_function);
   __ sw(a1, MemOperand(sp, argc_ * kPointerSize));
-  __ li(a0, Operand(argc_));  // Setup the number of arguments.
+  __ li(a0, Operand(argc_));  // Set up the number of arguments.
   __ mov(a2, zero_reg);
   __ GetBuiltinEntry(a3, Builtins::CALL_NON_FUNCTION);
   __ SetCallKind(t1, CALL_AS_METHOD);
@@ -5927,7 +5927,7 @@ void StringHelper::GenerateHashInit(MacroAssembler* masm,
                                     Register hash,
                                     Register character) {
   // hash = seed + character + ((seed + character) << 10);
-  __ LoadRoot(hash, Heap::kStringHashSeedRootIndex);
+  __ LoadRoot(hash, Heap::kHashSeedRootIndex);
   // Untag smi seed and add the character.
   __ SmiUntag(hash);
   __ addu(hash, hash, character);
@@ -5954,7 +5954,7 @@ void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm,
 
 
 void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
-                                         Register hash) {
+                                       Register hash) {
   // hash += hash << 3;
   __ sll(at, hash, 3);
   __ addu(hash, hash, at);
@@ -5965,12 +5965,11 @@ void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
   __ sll(at, hash, 15);
   __ addu(hash, hash, at);
 
-  uint32_t kHashShiftCutOffMask = (1 << (32 - String::kHashShift)) - 1;
-  __ li(at, Operand(kHashShiftCutOffMask));
+  __ li(at, Operand(String::kHashBitMask));
   __ and_(hash, hash, at);
 
   // if (hash == 0) hash = 27;
-  __ ori(at, zero_reg, 27);
+  __ ori(at, zero_reg, StringHasher::kZeroHash);
   __ movz(hash, at, hash);
 }
 
diff --git a/deps/v8/src/mips/constants-mips.h b/deps/v8/src/mips/constants-mips.h
index 4f486c1c0..210becb44 100644
--- a/deps/v8/src/mips/constants-mips.h
+++ b/deps/v8/src/mips/constants-mips.h
@@ -125,7 +125,7 @@ class Registers {
 
   struct RegisterAlias {
     int reg;
-    const char *name;
+    const char* name;
   };
 
   static const int32_t kMaxValue = 0x7fffffff;
@@ -147,7 +147,7 @@ class FPURegisters {
 
   struct RegisterAlias {
     int creg;
-    const char *name;
+    const char* name;
   };
 
  private:
diff --git a/deps/v8/src/mips/cpu-mips.cc b/deps/v8/src/mips/cpu-mips.cc
index 26e95fb24..a1e062c80 100644
--- a/deps/v8/src/mips/cpu-mips.cc
+++ b/deps/v8/src/mips/cpu-mips.cc
@@ -47,7 +47,7 @@ namespace v8 {
 namespace internal {
 
 
-void CPU::Setup() {
+void CPU::SetUp() {
   CpuFeatures::Probe();
 }
 
diff --git a/deps/v8/src/mips/deoptimizer-mips.cc b/deps/v8/src/mips/deoptimizer-mips.cc
index a27c61cb2..44af3d7b2 100644
--- a/deps/v8/src/mips/deoptimizer-mips.cc
+++ b/deps/v8/src/mips/deoptimizer-mips.cc
@@ -326,7 +326,7 @@ void Deoptimizer::DoComputeOsrOutputFrame() {
     output_[0] = input_;
     output_[0]->SetPc(reinterpret_cast<uint32_t>(from_));
   } else {
-    // Setup the frame pointer and the context pointer.
+    // Set up the frame pointer and the context pointer.
     output_[0]->SetRegister(fp.code(), input_->GetRegister(fp.code()));
     output_[0]->SetRegister(cp.code(), input_->GetRegister(cp.code()));
 
@@ -733,10 +733,7 @@ void Deoptimizer::EntryGenerator::Generate() {
     }
   }
 
-  // Set up the roots register.
-  ExternalReference roots_array_start =
-      ExternalReference::roots_array_start(isolate);
-  __ li(roots, Operand(roots_array_start));
+  __ InitializeRootRegister();
 
   __ pop(at);  // Get continuation, leave pc on stack.
   __ pop(ra);
diff --git a/deps/v8/src/mips/full-codegen-mips.cc b/deps/v8/src/mips/full-codegen-mips.cc
index 1e950e5f5..7394077f0 100644
--- a/deps/v8/src/mips/full-codegen-mips.cc
+++ b/deps/v8/src/mips/full-codegen-mips.cc
@@ -1017,7 +1017,7 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ lw(a1, FieldMemOperand(a1, DescriptorArray::kEnumerationIndexOffset));
   __ lw(a2, FieldMemOperand(a1, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
-  // Setup the four remaining stack slots.
+  // Set up the four remaining stack slots.
   __ push(v0);  // Map.
   __ lw(a1, FieldMemOperand(a2, FixedArray::kLengthOffset));
   __ li(a0, Operand(Smi::FromInt(0)));
diff --git a/deps/v8/src/mips/lithium-codegen-mips.cc b/deps/v8/src/mips/lithium-codegen-mips.cc
index 06e886c6b..de6400708 100644
--- a/deps/v8/src/mips/lithium-codegen-mips.cc
+++ b/deps/v8/src/mips/lithium-codegen-mips.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -2794,7 +2794,7 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
   __ lw(at, FieldMemOperand(a1, JSFunction::kCodeEntryOffset));
   __ Call(at);
 
-  // Setup deoptimization.
+  // Set up deoptimization.
   RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT);
 
   // Restore context.
@@ -3095,6 +3095,27 @@ void LCodeGen::DoPower(LPower* instr) {
 }
 
 
+void LCodeGen::DoRandom(LRandom* instr) {
+  // Having marked this instruction as a call we can use any
+  // registers.
+  ASSERT(ToDoubleRegister(instr->result()).is(f0));
+  ASSERT(ToRegister(instr->InputAt(0)).is(a0));
+
+  __ PrepareCallCFunction(1, a1);
+  __ lw(a0, FieldMemOperand(a0, GlobalObject::kGlobalContextOffset));
+  __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
+
+  // 0x41300000 is the top half of 1.0 x 2^20 as a double.
+  __ li(a2, Operand(0x41300000));
+  // Move 0x41300000xxxxxxxx (x = random bits in v0) to FPU.
+  __ Move(f12, v0, a2);
+  // Move 0x4130000000000000 to FPU.
+  __ Move(f14, zero_reg, a2);
+  // Subtract to get the result.
+  __ sub_d(f0, f12, f14);
+}
+
+
 void LCodeGen::DoMathLog(LUnaryMathOperation* instr) {
   ASSERT(ToDoubleRegister(instr->result()).is(f4));
   TranscendentalCacheStub stub(TranscendentalCache::LOG,
diff --git a/deps/v8/src/mips/lithium-codegen-mips.h b/deps/v8/src/mips/lithium-codegen-mips.h
index 68a7c5b1a..2a5468199 100644
--- a/deps/v8/src/mips/lithium-codegen-mips.h
+++ b/deps/v8/src/mips/lithium-codegen-mips.h
@@ -148,9 +148,9 @@ class LCodeGen BASE_EMBEDDED {
   Scope* scope() const { return scope_; }
   HGraph* graph() const { return chunk_->graph(); }
 
-  Register scratch0() { return lithiumScratchReg; }
-  Register scratch1() { return lithiumScratchReg2; }
-  DoubleRegister double_scratch0() { return lithiumScratchDouble; }
+  Register scratch0() { return kLithiumScratchReg; }
+  Register scratch1() { return kLithiumScratchReg2; }
+  DoubleRegister double_scratch0() { return kLithiumScratchDouble; }
 
   int GetNextEmittedBlock(int block);
   LInstruction* GetNextInstruction();
@@ -423,7 +423,7 @@ class LDeferredCode: public ZoneObject {
   virtual void Generate() = 0;
   virtual LInstruction* instr() = 0;
 
-  void SetExit(Label *exit) { external_exit_ = exit; }
+  void SetExit(Label* exit) { external_exit_ = exit; }
   Label* entry() { return &entry_; }
   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
   int instruction_index() const { return instruction_index_; }
diff --git a/deps/v8/src/mips/lithium-gap-resolver-mips.cc b/deps/v8/src/mips/lithium-gap-resolver-mips.cc
index 2e5c64e7a..279a95ece 100644
--- a/deps/v8/src/mips/lithium-gap-resolver-mips.cc
+++ b/deps/v8/src/mips/lithium-gap-resolver-mips.cc
@@ -33,8 +33,8 @@
 namespace v8 {
 namespace internal {
 
-static const Register kSavedValueRegister = lithiumScratchReg;
-static const DoubleRegister kSavedDoubleValueRegister = lithiumScratchDouble;
+static const Register kSavedValueRegister = kLithiumScratchReg;
+static const DoubleRegister kSavedDoubleValueRegister = kLithiumScratchDouble;
 
 LGapResolver::LGapResolver(LCodeGen* owner)
     : cgen_(owner),
diff --git a/deps/v8/src/mips/lithium-mips.cc b/deps/v8/src/mips/lithium-mips.cc
index 634b70610..b66b98f20 100644
--- a/deps/v8/src/mips/lithium-mips.cc
+++ b/deps/v8/src/mips/lithium-mips.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1038,14 +1038,23 @@ LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
 
 
 LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
-  HValue* v = instr->value();
-  if (v->EmitAtUses()) {
-    HBasicBlock* successor = HConstant::cast(v)->ToBoolean()
+  HValue* value = instr->value();
+  if (value->EmitAtUses()) {
+    HBasicBlock* successor = HConstant::cast(value)->ToBoolean()
         ? instr->FirstSuccessor()
         : instr->SecondSuccessor();
     return new LGoto(successor->block_id());
   }
-  return AssignEnvironment(new LBranch(UseRegister(v)));
+
+  LBranch* result = new LBranch(UseRegister(value));
+  // Tagged values that are not known smis or booleans require a
+  // deoptimization environment.
+  Representation rep = value->representation();
+  HType type = value->type();
+  if (rep.IsTagged() && !type.IsSmi() && !type.IsBoolean()) {
+    return AssignEnvironment(result);
+  }
+  return result;
 }
 
 
@@ -1345,7 +1354,12 @@ LInstruction* LChunkBuilder::DoMul(HMul* instr) {
     } else {
       left = UseRegisterAtStart(instr->LeastConstantOperand());
     }
-    return AssignEnvironment(DefineAsRegister(new LMulI(left, right, temp)));
+    LMulI* mul = new LMulI(left, right, temp);
+    if (instr->CheckFlag(HValue::kCanOverflow) ||
+        instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      AssignEnvironment(mul);
+    }
+    return DefineAsRegister(mul);
 
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::MUL, instr);
@@ -1414,6 +1428,15 @@ LInstruction* LChunkBuilder::DoPower(HPower* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
+  ASSERT(instr->representation().IsDouble());
+  ASSERT(instr->global_object()->representation().IsTagged());
+  LOperand* global_object = UseFixed(instr->global_object(), a0);
+  LRandom* result = new LRandom(global_object);
+  return MarkAsCall(DefineFixedDouble(result, f0), instr);
+}
+
+
 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
   Representation r = instr->GetInputRepresentation();
   ASSERT(instr->left()->representation().IsTagged());
@@ -1558,7 +1581,7 @@ LInstruction* LChunkBuilder::DoElementsKind(HElementsKind* instr) {
 LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
   LOperand* object = UseRegister(instr->value());
   LValueOf* result = new LValueOf(object, TempRegister());
-  return AssignEnvironment(DefineAsRegister(result));
+  return DefineAsRegister(result);
 }
 
 
@@ -1877,7 +1900,8 @@ LInstruction* LChunkBuilder::DoLoadKeyedFastElement(
   LOperand* obj = UseRegisterAtStart(instr->object());
   LOperand* key = UseRegisterAtStart(instr->key());
   LLoadKeyedFastElement* result = new LLoadKeyedFastElement(obj, key);
-  return AssignEnvironment(DefineAsRegister(result));
+  if (instr->RequiresHoleCheck()) AssignEnvironment(result);
+  return DefineAsRegister(result);
 }
 
 
diff --git a/deps/v8/src/mips/lithium-mips.h b/deps/v8/src/mips/lithium-mips.h
index da59dd8b0..069a0251f 100644
--- a/deps/v8/src/mips/lithium-mips.h
+++ b/deps/v8/src/mips/lithium-mips.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -141,6 +141,7 @@ class LCodeGen;
   V(Parameter)                                  \
   V(Power)                                      \
   V(PushArgument)                               \
+  V(Random)                                     \
   V(RegExpLiteral)                              \
   V(Return)                                     \
   V(ShiftI)                                     \
@@ -1026,6 +1027,17 @@ class LPower: public LTemplateInstruction<1, 2, 0> {
 };
 
 
+class LRandom: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LRandom(LOperand* global_object) {
+    inputs_[0] = global_object;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Random, "random")
+  DECLARE_HYDROGEN_ACCESSOR(Random)
+};
+
+
 class LArithmeticD: public LTemplateInstruction<1, 2, 0> {
  public:
   LArithmeticD(Token::Value op, LOperand* left, LOperand* right)
diff --git a/deps/v8/src/mips/macro-assembler-mips.cc b/deps/v8/src/mips/macro-assembler-mips.cc
index cdacbf3c0..4517fe181 100644
--- a/deps/v8/src/mips/macro-assembler-mips.cc
+++ b/deps/v8/src/mips/macro-assembler-mips.cc
@@ -252,6 +252,12 @@ void MacroAssembler::RecordWrite(Register object,
   // registers are cp.
   ASSERT(!address.is(cp) && !value.is(cp));
 
+  if (emit_debug_code()) {
+    lw(at, MemOperand(address));
+    Assert(
+        eq, "Wrong address or value passed to RecordWrite", at, Operand(value));
+  }
+
   Label done;
 
   if (smi_check == INLINE_SMI_CHECK) {
@@ -297,7 +303,7 @@ void MacroAssembler::RememberedSetHelper(Register object,  // For debug tests.
                                          SaveFPRegsMode fp_mode,
                                          RememberedSetFinalAction and_then) {
   Label done;
-  if (FLAG_debug_code) {
+  if (emit_debug_code()) {
     Label ok;
     JumpIfNotInNewSpace(object, scratch, &ok);
     stop("Remembered set pointer is in new space");
@@ -409,6 +415,44 @@ void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
 }
 
 
+void MacroAssembler::GetNumberHash(Register reg0, Register scratch) {
+  // First of all we assign the hash seed to scratch.
+  LoadRoot(scratch, Heap::kHashSeedRootIndex);
+  SmiUntag(scratch);
+
+  // Xor original key with a seed.
+  xor_(reg0, reg0, scratch);
+
+  // Compute the hash code from the untagged key.  This must be kept in sync
+  // with ComputeIntegerHash in utils.h.
+  //
+  // hash = ~hash + (hash << 15);
+  nor(scratch, reg0, zero_reg);
+  sll(at, reg0, 15);
+  addu(reg0, scratch, at);
+
+  // hash = hash ^ (hash >> 12);
+  srl(at, reg0, 12);
+  xor_(reg0, reg0, at);
+
+  // hash = hash + (hash << 2);
+  sll(at, reg0, 2);
+  addu(reg0, reg0, at);
+
+  // hash = hash ^ (hash >> 4);
+  srl(at, reg0, 4);
+  xor_(reg0, reg0, at);
+
+  // hash = hash * 2057;
+  li(scratch, Operand(2057));
+  mul(reg0, reg0, scratch);
+
+  // hash = hash ^ (hash >> 16);
+  srl(at, reg0, 16);
+  xor_(reg0, reg0, at);
+}
+
+
 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
                                               Register elements,
                                               Register key,
@@ -440,36 +484,10 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   // at   - Temporary (avoid MacroAssembler instructions also using 'at').
   Label done;
 
-  // Compute the hash code from the untagged key.  This must be kept in sync
-  // with ComputeIntegerHash in utils.h.
-  //
-  // hash = ~hash + (hash << 15);
-  nor(reg1, reg0, zero_reg);
-  sll(at, reg0, 15);
-  addu(reg0, reg1, at);
-
-  // hash = hash ^ (hash >> 12);
-  srl(at, reg0, 12);
-  xor_(reg0, reg0, at);
-
-  // hash = hash + (hash << 2);
-  sll(at, reg0, 2);
-  addu(reg0, reg0, at);
-
-  // hash = hash ^ (hash >> 4);
-  srl(at, reg0, 4);
-  xor_(reg0, reg0, at);
-
-  // hash = hash * 2057;
-  li(reg1, Operand(2057));
-  mul(reg0, reg0, reg1);
-
-  // hash = hash ^ (hash >> 16);
-  srl(at, reg0, 16);
-  xor_(reg0, reg0, at);
+  GetNumberHash(reg0, reg1);
 
   // Compute the capacity mask.
-  lw(reg1, FieldMemOperand(elements, NumberDictionary::kCapacityOffset));
+  lw(reg1, FieldMemOperand(elements, SeededNumberDictionary::kCapacityOffset));
   sra(reg1, reg1, kSmiTagSize);
   Subu(reg1, reg1, Operand(1));
 
@@ -480,12 +498,12 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
     mov(reg2, reg0);
     // Compute the masked index: (hash + i + i * i) & mask.
     if (i > 0) {
-      Addu(reg2, reg2, Operand(NumberDictionary::GetProbeOffset(i)));
+      Addu(reg2, reg2, Operand(SeededNumberDictionary::GetProbeOffset(i)));
     }
     and_(reg2, reg2, reg1);
 
     // Scale the index by multiplying by the element size.
-    ASSERT(NumberDictionary::kEntrySize == 3);
+    ASSERT(SeededNumberDictionary::kEntrySize == 3);
     sll(at, reg2, 1);  // 2x.
     addu(reg2, reg2, at);  // reg2 = reg2 * 3.
 
@@ -493,7 +511,7 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
     sll(at, reg2, kPointerSizeLog2);
     addu(reg2, elements, at);
 
-    lw(at, FieldMemOperand(reg2, NumberDictionary::kElementsStartOffset));
+    lw(at, FieldMemOperand(reg2, SeededNumberDictionary::kElementsStartOffset));
     if (i != kProbes - 1) {
       Branch(&done, eq, key, Operand(at));
     } else {
@@ -505,14 +523,14 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   // Check that the value is a normal property.
   // reg2: elements + (index * kPointerSize).
   const int kDetailsOffset =
-      NumberDictionary::kElementsStartOffset + 2 * kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
   lw(reg1, FieldMemOperand(reg2, kDetailsOffset));
   And(at, reg1, Operand(Smi::FromInt(PropertyDetails::TypeField::kMask)));
   Branch(miss, ne, at, Operand(zero_reg));
 
   // Get the value at the masked, scaled index and return.
   const int kValueOffset =
-      NumberDictionary::kElementsStartOffset + kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + kPointerSize;
   lw(result, FieldMemOperand(reg2, kValueOffset));
 }
 
@@ -4261,7 +4279,7 @@ void MacroAssembler::LeaveFrame(StackFrame::Type type) {
 
 void MacroAssembler::EnterExitFrame(bool save_doubles,
                                     int stack_space) {
-  // Setup the frame structure on the stack.
+  // Set up the frame structure on the stack.
   STATIC_ASSERT(2 * kPointerSize == ExitFrameConstants::kCallerSPDisplacement);
   STATIC_ASSERT(1 * kPointerSize == ExitFrameConstants::kCallerPCOffset);
   STATIC_ASSERT(0 * kPointerSize == ExitFrameConstants::kCallerFPOffset);
@@ -4279,7 +4297,7 @@ void MacroAssembler::EnterExitFrame(bool save_doubles,
   addiu(sp, sp, -4 * kPointerSize);
   sw(ra, MemOperand(sp, 3 * kPointerSize));
   sw(fp, MemOperand(sp, 2 * kPointerSize));
-  addiu(fp, sp, 2 * kPointerSize);  // Setup new frame pointer.
+  addiu(fp, sp, 2 * kPointerSize);  // Set up new frame pointer.
 
   if (emit_debug_code()) {
     sw(zero_reg, MemOperand(fp, ExitFrameConstants::kSPOffset));
@@ -4826,7 +4844,7 @@ void MacroAssembler::EnsureNotWhite(
   And(t8, mask_scratch, load_scratch);
   Branch(&done, ne, t8, Operand(zero_reg));
 
-  if (FLAG_debug_code) {
+  if (emit_debug_code()) {
     // Check for impossible bit pattern.
     Label ok;
     // sll may overflow, making the check conservative.
diff --git a/deps/v8/src/mips/macro-assembler-mips.h b/deps/v8/src/mips/macro-assembler-mips.h
index bd5b94f57..eb9cf6e57 100644
--- a/deps/v8/src/mips/macro-assembler-mips.h
+++ b/deps/v8/src/mips/macro-assembler-mips.h
@@ -53,13 +53,13 @@ class JumpTarget;
 
 // Register aliases.
 // cp is assumed to be a callee saved register.
-const Register lithiumScratchReg = s3;  // Scratch register.
-const Register lithiumScratchReg2 = s4;  // Scratch register.
-const Register condReg = s5;  // Simulated (partial) condition code for mips.
-const Register roots = s6;  // Roots array pointer.
+const Register kLithiumScratchReg = s3;  // Scratch register.
+const Register kLithiumScratchReg2 = s4;  // Scratch register.
+const Register kCondReg = s5;  // Simulated (partial) condition code for mips.
+const Register kRootRegister = s6;  // Roots array pointer.
 const Register cp = s7;     // JavaScript context pointer.
 const Register fp = s8_fp;  // Alias for fp.
-const DoubleRegister lithiumScratchDouble = f30;  // Double scratch register.
+const DoubleRegister kLithiumScratchDouble = f30;  // Double scratch register.
 
 // Flags used for the AllocateInNewSpace functions.
 enum AllocationFlags {
@@ -405,6 +405,7 @@ class MacroAssembler: public Assembler {
                               Register scratch,
                               Label* miss);
 
+  void GetNumberHash(Register reg0, Register scratch);
 
   void LoadFromNumberDictionary(Label* miss,
                                 Register elements,
@@ -789,11 +790,16 @@ class MacroAssembler: public Assembler {
                                     Register map,
                                     Register scratch);
 
+  void InitializeRootRegister() {
+    ExternalReference roots_array_start =
+        ExternalReference::roots_array_start(isolate());
+    li(kRootRegister, Operand(roots_array_start));
+  }
 
   // -------------------------------------------------------------------------
   // JavaScript invokes.
 
-  // Setup call kind marking in t1. The method takes t1 as an
+  // Set up call kind marking in t1. The method takes t1 as an
   // explicit first parameter to make the code more readable at the
   // call sites.
   void SetCallKind(Register dst, CallKind kind);
diff --git a/deps/v8/src/mips/simulator-mips.cc b/deps/v8/src/mips/simulator-mips.cc
index f70775d86..191c2cafd 100644
--- a/deps/v8/src/mips/simulator-mips.cc
+++ b/deps/v8/src/mips/simulator-mips.cc
@@ -888,7 +888,7 @@ Simulator::Simulator(Isolate* isolate) : isolate_(isolate) {
     isolate_->set_simulator_i_cache(i_cache_);
   }
   Initialize(isolate);
-  // Setup simulator support first. Some of this information is needed to
+  // Set up simulator support first. Some of this information is needed to
   // setup the architecture state.
   stack_ = reinterpret_cast<char*>(malloc(stack_size_));
   pc_modified_ = false;
@@ -897,7 +897,7 @@ Simulator::Simulator(Isolate* isolate) : isolate_(isolate) {
   break_pc_ = NULL;
   break_instr_ = 0;
 
-  // Setup architecture state.
+  // Set up architecture state.
   // All registers are initialized to zero to start with.
   for (int i = 0; i < kNumSimuRegisters; i++) {
     registers_[i] = 0;
@@ -1944,7 +1944,7 @@ void Simulator::DecodeTypeRegister(Instruction* instr) {
   // Next pc
   int32_t next_pc = 0;
 
-  // Setup the variables if needed before executing the instruction.
+  // Set up the variables if needed before executing the instruction.
   ConfigureTypeRegister(instr,
                         alu_out,
                         i64hilo,
@@ -2711,7 +2711,7 @@ void Simulator::Execute() {
 int32_t Simulator::Call(byte* entry, int argument_count, ...) {
   va_list parameters;
   va_start(parameters, argument_count);
-  // Setup arguments.
+  // Set up arguments.
 
   // First four arguments passed in registers.
   ASSERT(argument_count >= 4);
@@ -2758,7 +2758,7 @@ int32_t Simulator::Call(byte* entry, int argument_count, ...) {
   int32_t sp_val = get_register(sp);
   int32_t fp_val = get_register(fp);
 
-  // Setup the callee-saved registers with a known value. To be able to check
+  // Set up the callee-saved registers with a known value. To be able to check
   // that they are preserved properly across JS execution.
   int32_t callee_saved_value = icount_;
   set_register(s0, callee_saved_value);
diff --git a/deps/v8/src/mips/stub-cache-mips.cc b/deps/v8/src/mips/stub-cache-mips.cc
index a94e277a5..bf01861a6 100644
--- a/deps/v8/src/mips/stub-cache-mips.cc
+++ b/deps/v8/src/mips/stub-cache-mips.cc
@@ -1173,7 +1173,7 @@ void StubCompiler::GenerateLoadCallback(Handle<JSObject> object,
   __ EnterExitFrame(false, kApiStackSpace);
 
   // Create AccessorInfo instance on the stack above the exit frame with
-  // scratch2 (internal::Object **args_) as the data.
+  // scratch2 (internal::Object** args_) as the data.
   __ sw(a2, MemOperand(sp, kPointerSize));
   // a2 (second argument - see note above) = AccessorInfo&
   __ Addu(a2, sp, kPointerSize);
@@ -2430,7 +2430,7 @@ Handle<Code> CallStubCompiler::CompileCallGlobal(
     __ sw(a3, MemOperand(sp, argc * kPointerSize));
   }
 
-  // Setup the context (function already in r1).
+  // Set up the context (function already in r1).
   __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
   // Jump to the cached code (tail call).
diff --git a/deps/v8/src/objects-debug.cc b/deps/v8/src/objects-debug.cc
index 64bda9473..5c68ddff7 100644
--- a/deps/v8/src/objects-debug.cc
+++ b/deps/v8/src/objects-debug.cc
@@ -602,6 +602,13 @@ void AccessorInfo::AccessorInfoVerify() {
 }
 
 
+void AccessorPair::AccessorPairVerify() {
+  CHECK(IsAccessorPair());
+  VerifyPointer(getter());
+  VerifyPointer(setter());
+}
+
+
 void AccessCheckInfo::AccessCheckInfoVerify() {
   CHECK(IsAccessCheckInfo());
   VerifyPointer(named_callback());
@@ -739,7 +746,7 @@ void JSObject::IncrementSpillStatistics(SpillInformation* info) {
       break;
     }
     case DICTIONARY_ELEMENTS: {
-      NumberDictionary* dict = element_dictionary();
+      SeededNumberDictionary* dict = element_dictionary();
       info->number_of_slow_used_elements_ += dict->NumberOfElements();
       info->number_of_slow_unused_elements_ +=
           dict->Capacity() - dict->NumberOfElements();
diff --git a/deps/v8/src/objects-inl.h b/deps/v8/src/objects-inl.h
index c5cf06082..2e9ccc1fa 100644
--- a/deps/v8/src/objects-inl.h
+++ b/deps/v8/src/objects-inl.h
@@ -1725,7 +1725,7 @@ void FixedDoubleArray::Initialize(FixedArray* from) {
 }
 
 
-void FixedDoubleArray::Initialize(NumberDictionary* from) {
+void FixedDoubleArray::Initialize(SeededNumberDictionary* from) {
   int offset = kHeaderSize;
   for (int current = 0; current < length(); ++current) {
     WRITE_DOUBLE_FIELD(this, offset, hole_nan_as_double());
@@ -2057,7 +2057,7 @@ int HashTable<Shape, Key>::FindEntry(Key key) {
 template<typename Shape, typename Key>
 int HashTable<Shape, Key>::FindEntry(Isolate* isolate, Key key) {
   uint32_t capacity = Capacity();
-  uint32_t entry = FirstProbe(Shape::Hash(key), capacity);
+  uint32_t entry = FirstProbe(HashTable<Shape, Key>::Hash(key), capacity);
   uint32_t count = 1;
   // EnsureCapacity will guarantee the hash table is never full.
   while (true) {
@@ -2072,14 +2072,14 @@ int HashTable<Shape, Key>::FindEntry(Isolate* isolate, Key key) {
 }
 
 
-bool NumberDictionary::requires_slow_elements() {
+bool SeededNumberDictionary::requires_slow_elements() {
   Object* max_index_object = get(kMaxNumberKeyIndex);
   if (!max_index_object->IsSmi()) return false;
   return 0 !=
       (Smi::cast(max_index_object)->value() & kRequiresSlowElementsMask);
 }
 
-uint32_t NumberDictionary::max_number_key() {
+uint32_t SeededNumberDictionary::max_number_key() {
   ASSERT(!requires_slow_elements());
   Object* max_index_object = get(kMaxNumberKeyIndex);
   if (!max_index_object->IsSmi()) return 0;
@@ -2087,7 +2087,7 @@ uint32_t NumberDictionary::max_number_key() {
   return value >> kRequiresSlowElementsTagSize;
 }
 
-void NumberDictionary::set_requires_slow_elements() {
+void SeededNumberDictionary::set_requires_slow_elements() {
   set(kMaxNumberKeyIndex, Smi::FromInt(kRequiresSlowElementsMask));
 }
 
@@ -3386,6 +3386,9 @@ ACCESSORS(AccessorInfo, data, Object, kDataOffset)
 ACCESSORS(AccessorInfo, name, Object, kNameOffset)
 ACCESSORS(AccessorInfo, flag, Smi, kFlagOffset)
 
+ACCESSORS(AccessorPair, getter, Object, kGetterOffset)
+ACCESSORS(AccessorPair, setter, Object, kSetterOffset)
+
 ACCESSORS(AccessCheckInfo, named_callback, Object, kNamedCallbackOffset)
 ACCESSORS(AccessCheckInfo, indexed_callback, Object, kIndexedCallbackOffset)
 ACCESSORS(AccessCheckInfo, data, Object, kDataOffset)
@@ -4296,9 +4299,9 @@ StringDictionary* JSObject::property_dictionary() {
 }
 
 
-NumberDictionary* JSObject::element_dictionary() {
+SeededNumberDictionary* JSObject::element_dictionary() {
   ASSERT(HasDictionaryElements());
-  return NumberDictionary::cast(elements());
+  return SeededNumberDictionary::cast(elements());
 }
 
 
@@ -4328,7 +4331,7 @@ StringHasher::StringHasher(int length, uint32_t seed)
     is_array_index_(0 < length_ && length_ <= String::kMaxArrayIndexSize),
     is_first_char_(true),
     is_valid_(true) {
-  ASSERT(FLAG_randomize_string_hashes || raw_running_hash_ == 0);
+  ASSERT(FLAG_randomize_hashes || raw_running_hash_ == 0);
 }
 
 
@@ -4535,16 +4538,27 @@ bool NumberDictionaryShape::IsMatch(uint32_t key, Object* other) {
 }
 
 
-uint32_t NumberDictionaryShape::Hash(uint32_t key) {
-  return ComputeIntegerHash(key);
+uint32_t UnseededNumberDictionaryShape::Hash(uint32_t key) {
+  return ComputeIntegerHash(key, 0);
 }
 
 
-uint32_t NumberDictionaryShape::HashForObject(uint32_t key, Object* other) {
+uint32_t UnseededNumberDictionaryShape::HashForObject(uint32_t key,
+                                                      Object* other) {
   ASSERT(other->IsNumber());
-  return ComputeIntegerHash(static_cast<uint32_t>(other->Number()));
+  return ComputeIntegerHash(static_cast<uint32_t>(other->Number()), 0);
+}
+
+uint32_t SeededNumberDictionaryShape::SeededHash(uint32_t key, uint32_t seed) {
+  return ComputeIntegerHash(key, seed);
 }
 
+uint32_t SeededNumberDictionaryShape::SeededHashForObject(uint32_t key,
+                                                          uint32_t seed,
+                                                          Object* other) {
+  ASSERT(other->IsNumber());
+  return ComputeIntegerHash(static_cast<uint32_t>(other->Number()), seed);
+}
 
 MaybeObject* NumberDictionaryShape::AsObject(uint32_t key) {
   return Isolate::Current()->heap()->NumberFromUint32(key);
diff --git a/deps/v8/src/objects-printer.cc b/deps/v8/src/objects-printer.cc
index 4b5d049f5..e558e583e 100644
--- a/deps/v8/src/objects-printer.cc
+++ b/deps/v8/src/objects-printer.cc
@@ -786,6 +786,15 @@ void AccessorInfo::AccessorInfoPrint(FILE* out) {
 }
 
 
+void AccessorPair::AccessorPairPrint(FILE* out) {
+  HeapObject::PrintHeader(out, "AccessorPair");
+  PrintF(out, "\n - getter: ");
+  getter()->ShortPrint(out);
+  PrintF(out, "\n - setter: ");
+  setter()->ShortPrint(out);
+}
+
+
 void AccessCheckInfo::AccessCheckInfoPrint(FILE* out) {
   HeapObject::PrintHeader(out, "AccessCheckInfo");
   PrintF(out, "\n - named_callback: ");
diff --git a/deps/v8/src/objects.cc b/deps/v8/src/objects.cc
index 36879099e..abeeec9e2 100644
--- a/deps/v8/src/objects.cc
+++ b/deps/v8/src/objects.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -246,8 +246,8 @@ MaybeObject* JSObject::GetPropertyWithCallback(Object* receiver,
   }
 
   // __defineGetter__ callback
-  if (structure->IsFixedArray()) {
-    Object* getter = FixedArray::cast(structure)->get(kGetterIndex);
+  if (structure->IsAccessorPair()) {
+    Object* getter = AccessorPair::cast(structure)->getter();
     if (getter->IsSpecFunction()) {
       // TODO(rossberg): nicer would be to cast to some JSCallable here...
       return GetPropertyWithDefinedGetter(receiver, JSReceiver::cast(getter));
@@ -485,6 +485,16 @@ Object* JSObject::SetNormalizedProperty(LookupResult* result, Object* value) {
 }
 
 
+Handle<Object> JSObject::SetNormalizedProperty(Handle<JSObject> object,
+                                               Handle<String> key,
+                                               Handle<Object> value,
+                                               PropertyDetails details) {
+  CALL_HEAP_FUNCTION(object->GetIsolate(),
+                     object->SetNormalizedProperty(*key, *value, details),
+                     Object);
+}
+
+
 MaybeObject* JSObject::SetNormalizedProperty(String* name,
                                              Object* value,
                                              PropertyDetails details) {
@@ -1961,6 +1971,17 @@ MaybeObject* JSObject::SetPropertyWithInterceptor(
 }
 
 
+Handle<Object> JSReceiver::SetProperty(Handle<JSReceiver> object,
+                                       Handle<String> key,
+                                       Handle<Object> value,
+                                       PropertyAttributes attributes,
+                                       StrictModeFlag strict_mode) {
+  CALL_HEAP_FUNCTION(object->GetIsolate(),
+                     object->SetProperty(*key, *value, attributes, strict_mode),
+                     Object);
+}
+
+
 MaybeObject* JSReceiver::SetProperty(String* name,
                                      Object* value,
                                      PropertyAttributes attributes,
@@ -2018,8 +2039,8 @@ MaybeObject* JSObject::SetPropertyWithCallback(Object* structure,
     return *value_handle;
   }
 
-  if (structure->IsFixedArray()) {
-    Object* setter = FixedArray::cast(structure)->get(kSetterIndex);
+  if (structure->IsAccessorPair()) {
+    Object* setter = AccessorPair::cast(structure)->setter();
     if (setter->IsSpecFunction()) {
       // TODO(rossberg): nicer would be to cast to some JSCallable here...
      return SetPropertyWithDefinedSetter(JSReceiver::cast(setter), value);
@@ -2107,9 +2128,10 @@ MaybeObject* JSObject::SetElementWithCallbackSetterInPrototypes(
     if (!JSObject::cast(pt)->HasDictionaryElements()) {
       continue;
     }
-    NumberDictionary* dictionary = JSObject::cast(pt)->element_dictionary();
+    SeededNumberDictionary* dictionary =
+        JSObject::cast(pt)->element_dictionary();
     int entry = dictionary->FindEntry(index);
-    if (entry != NumberDictionary::kNotFound) {
+    if (entry != SeededNumberDictionary::kNotFound) {
       PropertyDetails details = dictionary->DetailsAt(entry);
       if (details.type() == CALLBACKS) {
         *found = true;
@@ -2342,7 +2364,9 @@ Object* Map::GetDescriptorContents(String* sentinel_name,
     if (details.type() == ELEMENTS_TRANSITION) {
       return descriptors->GetValue(index);
     } else {
-      *safe_to_add_transition = false;
+      if (safe_to_add_transition != NULL) {
+        *safe_to_add_transition = false;
+      }
     }
   }
   return NULL;
@@ -3024,6 +3048,18 @@ MaybeObject* JSObject::SetPropertyForResult(LookupResult* result,
 // Note that this method cannot be used to set the prototype of a function
 // because ConvertDescriptorToField() which is called in "case CALLBACKS:"
 // doesn't handle function prototypes correctly.
+Handle<Object> JSObject::SetLocalPropertyIgnoreAttributes(
+    Handle<JSObject> object,
+    Handle<String> key,
+    Handle<Object> value,
+    PropertyAttributes attributes) {
+  CALL_HEAP_FUNCTION(
+    object->GetIsolate(),
+    object->SetLocalPropertyIgnoreAttributes(*key, *value, attributes),
+    Object);
+}
+
+
 MaybeObject* JSObject::SetLocalPropertyIgnoreAttributes(
     String* name,
     Object* value,
@@ -3314,6 +3350,15 @@ MaybeObject* JSObject::UpdateMapCodeCache(String* name, Code* code) {
 }
 
 
+void JSObject::NormalizeProperties(Handle<JSObject> object,
+                                   PropertyNormalizationMode mode,
+                                   int expected_additional_properties) {
+  CALL_HEAP_FUNCTION_VOID(object->GetIsolate(),
+                          object->NormalizeProperties(
+                              mode, expected_additional_properties));
+}
+
+
 MaybeObject* JSObject::NormalizeProperties(PropertyNormalizationMode mode,
                                            int expected_additional_properties) {
   if (!HasFastProperties()) return this;
@@ -3436,6 +3481,14 @@ MaybeObject* JSObject::NormalizeProperties(PropertyNormalizationMode mode,
 }
 
 
+void JSObject::TransformToFastProperties(Handle<JSObject> object,
+                                         int unused_property_fields) {
+  CALL_HEAP_FUNCTION_VOID(
+      object->GetIsolate(),
+      object->TransformToFastProperties(unused_property_fields));
+}
+
+
 MaybeObject* JSObject::TransformToFastProperties(int unused_property_fields) {
   if (HasFastProperties()) return this;
   ASSERT(!IsGlobalObject());
@@ -3444,6 +3497,14 @@ MaybeObject* JSObject::TransformToFastProperties(int unused_property_fields) {
 }
 
 
+Handle<SeededNumberDictionary> JSObject::NormalizeElements(
+    Handle<JSObject> object) {
+  CALL_HEAP_FUNCTION(object->GetIsolate(),
+                     object->NormalizeElements(),
+                     SeededNumberDictionary);
+}
+
+
 MaybeObject* JSObject::NormalizeElements() {
   ASSERT(!HasExternalArrayElements());
 
@@ -3468,11 +3529,11 @@ MaybeObject* JSObject::NormalizeElements() {
   int old_capacity = 0;
   int used_elements = 0;
   GetElementsCapacityAndUsage(&old_capacity, &used_elements);
-  NumberDictionary* dictionary = NULL;
+  SeededNumberDictionary* dictionary = NULL;
   { Object* object;
-    MaybeObject* maybe = NumberDictionary::Allocate(used_elements);
+    MaybeObject* maybe = SeededNumberDictionary::Allocate(used_elements);
     if (!maybe->ToObject(&object)) return maybe;
-    dictionary = NumberDictionary::cast(object);
+    dictionary = SeededNumberDictionary::cast(object);
   }
 
   // Copy the elements to the new backing store.
@@ -3503,7 +3564,7 @@ MaybeObject* JSObject::NormalizeElements() {
       MaybeObject* maybe_result =
           dictionary->AddNumberEntry(i, value, details);
       if (!maybe_result->ToObject(&result)) return maybe_result;
-      dictionary = NumberDictionary::cast(result);
+      dictionary = SeededNumberDictionary::cast(result);
     }
   }
 
@@ -3560,6 +3621,14 @@ MaybeObject* JSObject::SetIdentityHash(Object* hash, CreationFlag flag) {
 }
 
 
+int JSObject::GetIdentityHash(Handle<JSObject> obj) {
+  CALL_AND_RETRY(obj->GetIsolate(),
+                 obj->GetIdentityHash(ALLOW_CREATION),
+                 return Smi::cast(__object__)->value(),
+                 return 0);
+}
+
+
 MaybeObject* JSObject::GetIdentityHash(CreationFlag flag) {
   Object* stored_value = GetHiddenProperty(GetHeap()->identity_hash_symbol());
   if (stored_value->IsSmi()) return stored_value;
@@ -3612,6 +3681,15 @@ Object* JSObject::GetHiddenProperty(String* key) {
 }
 
 
+Handle<Object> JSObject::SetHiddenProperty(Handle<JSObject> obj,
+                                 Handle<String> key,
+                                 Handle<Object> value) {
+  CALL_HEAP_FUNCTION(obj->GetIsolate(),
+                     obj->SetHiddenProperty(*key, *value),
+                     Object);
+}
+
+
 MaybeObject* JSObject::SetHiddenProperty(String* key, Object* value) {
   if (IsJSGlobalProxy()) {
     // For a proxy, use the prototype as target object.
@@ -3839,6 +3917,14 @@ MaybeObject* JSObject::DeleteElementWithInterceptor(uint32_t index) {
 }
 
 
+Handle<Object> JSObject::DeleteElement(Handle<JSObject> obj,
+                                       uint32_t index) {
+  CALL_HEAP_FUNCTION(obj->GetIsolate(),
+                     obj->DeleteElement(index, JSObject::NORMAL_DELETION),
+                     Object);
+}
+
+
 MaybeObject* JSObject::DeleteElement(uint32_t index, DeleteMode mode) {
   Isolate* isolate = GetIsolate();
   // Check access rights if needed.
@@ -3867,19 +3953,11 @@ MaybeObject* JSObject::DeleteElement(uint32_t index, DeleteMode mode) {
 }
 
 
-MaybeObject* JSReceiver::DeleteProperty(String* name, DeleteMode mode) {
-  if (IsJSProxy()) {
-    return JSProxy::cast(this)->DeletePropertyWithHandler(name, mode);
-  }
-  return JSObject::cast(this)->DeleteProperty(name, mode);
-}
-
-
-MaybeObject* JSReceiver::DeleteElement(uint32_t index, DeleteMode mode) {
-  if (IsJSProxy()) {
-    return JSProxy::cast(this)->DeleteElementWithHandler(index, mode);
-  }
-  return JSObject::cast(this)->DeleteElement(index, mode);
+Handle<Object> JSObject::DeleteProperty(Handle<JSObject> obj,
+                              Handle<String> prop) {
+  CALL_HEAP_FUNCTION(obj->GetIsolate(),
+                     obj->DeleteProperty(*prop, JSObject::NORMAL_DELETION),
+                     Object);
 }
 
 
@@ -3940,6 +4018,22 @@ MaybeObject* JSObject::DeleteProperty(String* name, DeleteMode mode) {
 }
 
 
+MaybeObject* JSReceiver::DeleteElement(uint32_t index, DeleteMode mode) {
+  if (IsJSProxy()) {
+    return JSProxy::cast(this)->DeleteElementWithHandler(index, mode);
+  }
+  return JSObject::cast(this)->DeleteElement(index, mode);
+}
+
+
+MaybeObject* JSReceiver::DeleteProperty(String* name, DeleteMode mode) {
+  if (IsJSProxy()) {
+    return JSProxy::cast(this)->DeletePropertyWithHandler(name, mode);
+  }
+  return JSObject::cast(this)->DeleteProperty(name, mode);
+}
+
+
 bool JSObject::ReferencesObjectFromElements(FixedArray* elements,
                                             ElementsKind kind,
                                             Object* object) {
@@ -3954,7 +4048,8 @@ bool JSObject::ReferencesObjectFromElements(FixedArray* elements,
       if (!element->IsTheHole() && element == object) return true;
     }
   } else {
-    Object* key = NumberDictionary::cast(elements)->SlowReverseLookup(object);
+    Object* key =
+        SeededNumberDictionary::cast(elements)->SlowReverseLookup(object);
     if (!key->IsUndefined()) return true;
   }
   return false;
@@ -4066,6 +4161,11 @@ bool JSObject::ReferencesObject(Object* obj) {
 }
 
 
+Handle<Object> JSObject::PreventExtensions(Handle<JSObject> object) {
+  CALL_HEAP_FUNCTION(object->GetIsolate(), object->PreventExtensions(), Object);
+}
+
+
 MaybeObject* JSObject::PreventExtensions() {
   Isolate* isolate = GetIsolate();
   if (IsAccessCheckNeeded() &&
@@ -4095,9 +4195,9 @@ MaybeObject* JSObject::PreventExtensions() {
   }
 
   // If there are fast elements we normalize.
-  NumberDictionary* dictionary = NULL;
+  SeededNumberDictionary* dictionary = NULL;
   { MaybeObject* maybe = NormalizeElements();
-    if (!maybe->To<NumberDictionary>(&dictionary)) return maybe;
+    if (!maybe->To<SeededNumberDictionary>(&dictionary)) return maybe;
   }
   ASSERT(HasDictionaryElements() || HasDictionaryArgumentsElements());
   // Make sure that we never go back to fast case.
@@ -4257,21 +4357,21 @@ void JSObject::LookupCallback(String* name, LookupResult* result) {
 
 
 // Search for a getter or setter in an elements dictionary and update its
-// attributes.  Returns either undefined if the element is non-deletable, or
-// the getter/setter pair (fixed array) if there is an existing one, or the
-// hole value if the element does not exist or is a normal non-getter/setter
-// data element.
-static Object* UpdateGetterSetterInDictionary(NumberDictionary* dictionary,
-                                              uint32_t index,
-                                              PropertyAttributes attributes,
-                                              Heap* heap) {
+// attributes.  Returns either undefined if the element is non-deletable, or the
+// getter/setter pair if there is an existing one, or the hole value if the
+// element does not exist or is a normal non-getter/setter data element.
+static Object* UpdateGetterSetterInDictionary(
+    SeededNumberDictionary* dictionary,
+    uint32_t index,
+    PropertyAttributes attributes,
+    Heap* heap) {
   int entry = dictionary->FindEntry(index);
-  if (entry != NumberDictionary::kNotFound) {
+  if (entry != SeededNumberDictionary::kNotFound) {
     Object* result = dictionary->ValueAt(entry);
     PropertyDetails details = dictionary->DetailsAt(entry);
     // TODO(mstarzinger): We should check for details.IsDontDelete() here once
     // we only call into the runtime once to set both getter and setter.
-    if (details.type() == CALLBACKS && result->IsFixedArray()) {
+    if (details.type() == CALLBACKS && result->IsAccessorPair()) {
       if (details.attributes() != attributes) {
         dictionary->DetailsAtPut(entry,
                                  PropertyDetails(attributes, CALLBACKS, index));
@@ -4338,7 +4438,8 @@ MaybeObject* JSObject::DefineGetterSetter(String* name,
         if (probe == NULL || probe->IsTheHole()) {
           FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
           if (arguments->IsDictionary()) {
-            NumberDictionary* dictionary = NumberDictionary::cast(arguments);
+            SeededNumberDictionary* dictionary =
+                SeededNumberDictionary::cast(arguments);
             probe = UpdateGetterSetterInDictionary(dictionary,
                                                    index,
                                                    attributes,
@@ -4359,7 +4460,7 @@ MaybeObject* JSObject::DefineGetterSetter(String* name,
       if (result.type() == CALLBACKS) {
         Object* obj = result.GetCallbackObject();
         // Need to preserve old getters/setters.
-        if (obj->IsFixedArray()) {
+        if (obj->IsAccessorPair()) {
           // Use set to update attributes.
           return SetPropertyCallback(name, obj, attributes);
         }
@@ -4367,16 +4468,15 @@ MaybeObject* JSObject::DefineGetterSetter(String* name,
     }
   }
 
-  // Allocate the fixed array to hold getter and setter.
-  Object* structure;
-  { MaybeObject* maybe_structure = heap->AllocateFixedArray(2, TENURED);
-    if (!maybe_structure->ToObject(&structure)) return maybe_structure;
+  AccessorPair* accessors;
+  { MaybeObject* maybe_accessors = heap->AllocateAccessorPair();
+    if (!maybe_accessors->To<AccessorPair>(&accessors)) return maybe_accessors;
   }
 
   if (is_element) {
-    return SetElementCallback(index, structure, attributes);
+    return SetElementCallback(index, accessors, attributes);
   } else {
-    return SetPropertyCallback(name, structure, attributes);
+    return SetPropertyCallback(name, accessors, attributes);
   }
 }
 
@@ -4411,11 +4511,11 @@ MaybeObject* JSObject::SetElementCallback(uint32_t index,
   PropertyDetails details = PropertyDetails(attributes, CALLBACKS);
 
   // Normalize elements to make this operation simple.
-  NumberDictionary* dictionary = NULL;
+  SeededNumberDictionary* dictionary = NULL;
   { Object* result;
     MaybeObject* maybe = NormalizeElements();
     if (!maybe->ToObject(&result)) return maybe;
-    dictionary = NumberDictionary::cast(result);
+    dictionary = SeededNumberDictionary::cast(result);
   }
   ASSERT(HasDictionaryElements() || HasDictionaryArgumentsElements());
 
@@ -4423,7 +4523,7 @@ MaybeObject* JSObject::SetElementCallback(uint32_t index,
   { Object* result;
     MaybeObject* maybe = dictionary->Set(index, structure, details);
     if (!maybe->ToObject(&result)) return maybe;
-    dictionary = NumberDictionary::cast(result);
+    dictionary = SeededNumberDictionary::cast(result);
   }
 
   dictionary->set_requires_slow_elements();
@@ -4512,12 +4612,16 @@ MaybeObject* JSObject::DefineAccessor(String* name,
                                                  fun, attributes);
   }
 
-  Object* array;
-  { MaybeObject* maybe_array = DefineGetterSetter(name, attributes);
-    if (!maybe_array->ToObject(&array)) return maybe_array;
+  Object* accessors;
+  { MaybeObject* maybe_accessors = DefineGetterSetter(name, attributes);
+    if (!maybe_accessors->To<Object>(&accessors)) return maybe_accessors;
+  }
+  if (accessors->IsUndefined()) return accessors;
+  if (is_getter) {
+    AccessorPair::cast(accessors)->set_getter(fun);
+  } else {
+    AccessorPair::cast(accessors)->set_setter(fun);
   }
-  if (array->IsUndefined()) return array;
-  FixedArray::cast(array)->set(is_getter ? 0 : 1, fun);
   return this;
 }
 
@@ -4621,11 +4725,6 @@ Object* JSObject::LookupAccessor(String* name, bool is_getter) {
   }
 
   // Make the lookup and include prototypes.
-  // Introducing constants below makes static constants usage purely static
-  // and avoids linker errors in debug build using gcc.
-  const int getter_index = kGetterIndex;
-  const int setter_index = kSetterIndex;
-  int accessor_index = is_getter ? getter_index : setter_index;
   uint32_t index = 0;
   if (name->AsArrayIndex(&index)) {
     for (Object* obj = this;
@@ -4633,14 +4732,15 @@ Object* JSObject::LookupAccessor(String* name, bool is_getter) {
          obj = JSObject::cast(obj)->GetPrototype()) {
       JSObject* js_object = JSObject::cast(obj);
       if (js_object->HasDictionaryElements()) {
-        NumberDictionary* dictionary = js_object->element_dictionary();
+        SeededNumberDictionary* dictionary = js_object->element_dictionary();
         int entry = dictionary->FindEntry(index);
-        if (entry != NumberDictionary::kNotFound) {
+        if (entry != SeededNumberDictionary::kNotFound) {
           Object* element = dictionary->ValueAt(entry);
           PropertyDetails details = dictionary->DetailsAt(entry);
           if (details.type() == CALLBACKS) {
-            if (element->IsFixedArray()) {
-              return FixedArray::cast(element)->get(accessor_index);
+            if (element->IsAccessorPair()) {
+              AccessorPair* accessors = AccessorPair::cast(element);
+              return is_getter ? accessors->getter() : accessors->setter();
             }
           }
         }
@@ -4656,8 +4756,9 @@ Object* JSObject::LookupAccessor(String* name, bool is_getter) {
         if (result.IsReadOnly()) return heap->undefined_value();
         if (result.type() == CALLBACKS) {
           Object* obj = result.GetCallbackObject();
-          if (obj->IsFixedArray()) {
-            return FixedArray::cast(obj)->get(accessor_index);
+          if (obj->IsAccessorPair()) {
+            AccessorPair* accessors = AccessorPair::cast(obj);
+            return is_getter ? accessors->getter() : accessors->setter();
           }
         }
       }
@@ -6833,14 +6934,14 @@ uint32_t String::ComputeAndSetHash() {
   if (StringShape(this).IsSequentialAscii()) {
     field = HashSequentialString(SeqAsciiString::cast(this)->GetChars(),
                                  len,
-                                 GetHeap()->StringHashSeed());
+                                 GetHeap()->HashSeed());
   } else if (StringShape(this).IsSequentialTwoByte()) {
     field = HashSequentialString(SeqTwoByteString::cast(this)->GetChars(),
                                  len,
-                                 GetHeap()->StringHashSeed());
+                                 GetHeap()->HashSeed());
   } else {
     StringInputBuffer buffer(this);
-    field = ComputeHashField(&buffer, len, GetHeap()->StringHashSeed());
+    field = ComputeHashField(&buffer, len, GetHeap()->HashSeed());
   }
 
   // Store the hash code in the object.
@@ -8171,7 +8272,7 @@ static void CopyFastElementsToFast(FixedArray* source,
 }
 
 
-static void CopySlowElementsToFast(NumberDictionary* source,
+static void CopySlowElementsToFast(SeededNumberDictionary* source,
                                    FixedArray* destination,
                                    WriteBarrierMode mode) {
   int destination_length = destination->length();
@@ -8237,7 +8338,7 @@ MaybeObject* JSObject::SetFastElementsCapacityAndLength(
     case DICTIONARY_ELEMENTS: {
       AssertNoAllocation no_gc;
       WriteBarrierMode mode = new_elements->GetWriteBarrierMode(no_gc);
-      CopySlowElementsToFast(NumberDictionary::cast(old_elements_raw),
+      CopySlowElementsToFast(SeededNumberDictionary::cast(old_elements_raw),
                              new_elements,
                              mode);
       set_map_and_elements(new_map, new_elements);
@@ -8251,7 +8352,7 @@ MaybeObject* JSObject::SetFastElementsCapacityAndLength(
       FixedArray* parameter_map = FixedArray::cast(old_elements_raw);
       FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
       if (arguments->IsDictionary()) {
-        CopySlowElementsToFast(NumberDictionary::cast(arguments),
+        CopySlowElementsToFast(SeededNumberDictionary::cast(arguments),
                                new_elements,
                                mode);
       } else {
@@ -8347,7 +8448,7 @@ MaybeObject* JSObject::SetFastDoubleElementsCapacityAndLength(
       break;
     }
     case DICTIONARY_ELEMENTS: {
-      elems->Initialize(NumberDictionary::cast(old_elements));
+      elems->Initialize(SeededNumberDictionary::cast(old_elements));
       break;
     }
     default:
@@ -8607,7 +8708,7 @@ bool JSObject::HasElementPostInterceptor(JSReceiver* receiver, uint32_t index) {
     }
     case DICTIONARY_ELEMENTS: {
       if (element_dictionary()->FindEntry(index)
-          != NumberDictionary::kNotFound) {
+          != SeededNumberDictionary::kNotFound) {
         return true;
       }
       break;
@@ -8745,7 +8846,7 @@ JSObject::LocalElementType JSObject::HasLocalElement(uint32_t index) {
     }
     case DICTIONARY_ELEMENTS: {
       if (element_dictionary()->FindEntry(index) !=
-          NumberDictionary::kNotFound) {
+          SeededNumberDictionary::kNotFound) {
         return DICTIONARY_ELEMENT;
       }
       break;
@@ -8762,8 +8863,9 @@ JSObject::LocalElementType JSObject::HasLocalElement(uint32_t index) {
       // If not aliased, check the arguments.
       FixedArray* arguments = FixedArray::cast(parameter_map->get(1));
       if (arguments->IsDictionary()) {
-        NumberDictionary* dictionary = NumberDictionary::cast(arguments);
-        if (dictionary->FindEntry(index) != NumberDictionary::kNotFound) {
+        SeededNumberDictionary* dictionary =
+            SeededNumberDictionary::cast(arguments);
+        if (dictionary->FindEntry(index) != SeededNumberDictionary::kNotFound) {
           return DICTIONARY_ELEMENT;
         }
       } else {
@@ -8792,8 +8894,8 @@ bool JSObject::HasElementInElements(FixedArray* elements,
       return true;
     }
   } else {
-    if (NumberDictionary::cast(elements)->FindEntry(index) !=
-        NumberDictionary::kNotFound) {
+    if (SeededNumberDictionary::cast(elements)->FindEntry(index) !=
+        SeededNumberDictionary::kNotFound) {
       return true;
     }
   }
@@ -8860,7 +8962,7 @@ bool JSObject::HasElementWithReceiver(JSReceiver* receiver, uint32_t index) {
     }
     case DICTIONARY_ELEMENTS: {
       if (element_dictionary()->FindEntry(index)
-          != NumberDictionary::kNotFound) {
+          != SeededNumberDictionary::kNotFound) {
         return true;
       }
       break;
@@ -8964,8 +9066,8 @@ MaybeObject* JSObject::GetElementWithCallback(Object* receiver,
   }
 
   // __defineGetter__ callback
-  if (structure->IsFixedArray()) {
-    Object* getter = FixedArray::cast(structure)->get(kGetterIndex);
+  if (structure->IsAccessorPair()) {
+    Object* getter = AccessorPair::cast(structure)->getter();
     if (getter->IsSpecFunction()) {
       // TODO(rossberg): nicer would be to cast to some JSCallable here...
       return GetPropertyWithDefinedGetter(receiver, JSReceiver::cast(getter));
@@ -9021,8 +9123,8 @@ MaybeObject* JSObject::SetElementWithCallback(Object* structure,
     return *value_handle;
   }
 
-  if (structure->IsFixedArray()) {
-    Handle<Object> setter(FixedArray::cast(structure)->get(kSetterIndex));
+  if (structure->IsAccessorPair()) {
+    Handle<Object> setter(AccessorPair::cast(structure)->setter());
     if (setter->IsSpecFunction()) {
       // TODO(rossberg): nicer would be to cast to some JSCallable here...
       return SetPropertyWithDefinedSetter(JSReceiver::cast(*setter), value);
@@ -9183,15 +9285,15 @@ MaybeObject* JSObject::SetDictionaryElement(uint32_t index,
   FixedArray* elements = FixedArray::cast(this->elements());
   bool is_arguments =
       (elements->map() == heap->non_strict_arguments_elements_map());
-  NumberDictionary* dictionary = NULL;
+  SeededNumberDictionary* dictionary = NULL;
   if (is_arguments) {
-    dictionary = NumberDictionary::cast(elements->get(1));
+    dictionary = SeededNumberDictionary::cast(elements->get(1));
   } else {
-    dictionary = NumberDictionary::cast(elements);
+    dictionary = SeededNumberDictionary::cast(elements);
   }
 
   int entry = dictionary->FindEntry(index);
-  if (entry != NumberDictionary::kNotFound) {
+  if (entry != SeededNumberDictionary::kNotFound) {
     Object* element = dictionary->ValueAt(entry);
     PropertyDetails details = dictionary->DetailsAt(entry);
     if (details.type() == CALLBACKS) {
@@ -9236,13 +9338,13 @@ MaybeObject* JSObject::SetDictionaryElement(uint32_t index,
     FixedArrayBase* new_dictionary;
     MaybeObject* maybe = dictionary->AtNumberPut(index, value);
     if (!maybe->To<FixedArrayBase>(&new_dictionary)) return maybe;
-    if (dictionary != NumberDictionary::cast(new_dictionary)) {
+    if (dictionary != SeededNumberDictionary::cast(new_dictionary)) {
       if (is_arguments) {
         elements->set(1, new_dictionary);
       } else {
         set_elements(new_dictionary);
       }
-      dictionary = NumberDictionary::cast(new_dictionary);
+      dictionary = SeededNumberDictionary::cast(new_dictionary);
     }
   }
 
@@ -9388,6 +9490,35 @@ MaybeObject* JSReceiver::SetElement(uint32_t index,
 }
 
 
+Handle<Object> JSObject::SetOwnElement(Handle<JSObject> object,
+                                       uint32_t index,
+                                       Handle<Object> value,
+                                       StrictModeFlag strict_mode) {
+  ASSERT(!object->HasExternalArrayElements());
+  CALL_HEAP_FUNCTION(object->GetIsolate(),
+                     object->SetElement(index, *value, strict_mode, false),
+                     Object);
+}
+
+
+Handle<Object> JSObject::SetElement(Handle<JSObject> object,
+                                    uint32_t index,
+                                    Handle<Object> value,
+                                    StrictModeFlag strict_mode) {
+  if (object->HasExternalArrayElements()) {
+    if (!value->IsSmi() && !value->IsHeapNumber() && !value->IsUndefined()) {
+      bool has_exception;
+      Handle<Object> number = Execution::ToNumber(value, &has_exception);
+      if (has_exception) return Handle<Object>();
+      value = number;
+    }
+  }
+  CALL_HEAP_FUNCTION(object->GetIsolate(),
+                     object->SetElement(index, *value, strict_mode, true),
+                     Object);
+}
+
+
 MaybeObject* JSObject::SetElement(uint32_t index,
                                   Object* value,
                                   StrictModeFlag strict_mode,
@@ -9510,6 +9641,14 @@ MaybeObject* JSObject::SetElementWithoutInterceptor(uint32_t index,
 }
 
 
+Handle<Object> JSObject::TransitionElementsKind(Handle<JSObject> object,
+                                                ElementsKind to_kind) {
+  CALL_HEAP_FUNCTION(object->GetIsolate(),
+                     object->TransitionElementsKind(to_kind),
+                     Object);
+}
+
+
 MUST_USE_RESULT MaybeObject* JSObject::TransitionElementsKind(
     ElementsKind to_kind) {
   ElementsKind from_kind = map()->elements_kind();
@@ -9653,7 +9792,8 @@ void JSObject::GetElementsCapacityAndUsage(int* capacity, int* used) {
           FixedArray::cast(FixedArray::cast(backing_store_base)->get(1));
       backing_store = FixedArray::cast(backing_store_base);
       if (backing_store->IsDictionary()) {
-        NumberDictionary* dictionary = NumberDictionary::cast(backing_store);
+        SeededNumberDictionary* dictionary =
+            SeededNumberDictionary::cast(backing_store);
         *capacity = dictionary->Capacity();
         *used = dictionary->NumberOfElements();
         break;
@@ -9668,8 +9808,8 @@ void JSObject::GetElementsCapacityAndUsage(int* capacity, int* used) {
       }
       break;
     case DICTIONARY_ELEMENTS: {
-      NumberDictionary* dictionary =
-          NumberDictionary::cast(FixedArray::cast(elements()));
+      SeededNumberDictionary* dictionary =
+          SeededNumberDictionary::cast(FixedArray::cast(elements()));
       *capacity = dictionary->Capacity();
       *used = dictionary->NumberOfElements();
       break;
@@ -9714,8 +9854,8 @@ bool JSObject::ShouldConvertToSlowElements(int new_capacity) {
   int old_capacity = 0;
   int used_elements = 0;
   GetElementsCapacityAndUsage(&old_capacity, &used_elements);
-  int dictionary_size = NumberDictionary::ComputeCapacity(used_elements) *
-      NumberDictionary::kEntrySize;
+  int dictionary_size = SeededNumberDictionary::ComputeCapacity(used_elements) *
+      SeededNumberDictionary::kEntrySize;
   return 3 * dictionary_size <= new_capacity;
 }
 
@@ -9729,11 +9869,11 @@ bool JSObject::ShouldConvertToFastElements() {
   if (IsAccessCheckNeeded()) return false;
 
   FixedArray* elements = FixedArray::cast(this->elements());
-  NumberDictionary* dictionary = NULL;
+  SeededNumberDictionary* dictionary = NULL;
   if (elements->map() == GetHeap()->non_strict_arguments_elements_map()) {
-    dictionary = NumberDictionary::cast(elements->get(1));
+    dictionary = SeededNumberDictionary::cast(elements->get(1));
   } else {
-    dictionary = NumberDictionary::cast(elements);
+    dictionary = SeededNumberDictionary::cast(elements);
   }
   // If an element has been added at a very high index in the elements
   // dictionary, we cannot go back to fast case.
@@ -9748,7 +9888,7 @@ bool JSObject::ShouldConvertToFastElements() {
     array_size = dictionary->max_number_key();
   }
   uint32_t dictionary_size = static_cast<uint32_t>(dictionary->Capacity()) *
-      NumberDictionary::kEntrySize;
+      SeededNumberDictionary::kEntrySize;
   return 2 * dictionary_size >= array_size;
 }
 
@@ -9758,7 +9898,8 @@ bool JSObject::ShouldConvertToFastDoubleElements(
   *has_smi_only_elements = false;
   if (FLAG_unbox_double_arrays) {
     ASSERT(HasDictionaryElements());
-    NumberDictionary* dictionary = NumberDictionary::cast(elements());
+    SeededNumberDictionary* dictionary =
+        SeededNumberDictionary::cast(elements());
     bool found_double = false;
     for (int i = 0; i < dictionary->Capacity(); i++) {
       Object* key = dictionary->KeyAt(i);
@@ -9978,7 +10119,7 @@ bool JSObject::HasRealElementProperty(uint32_t index) {
     }
     case DICTIONARY_ELEMENTS: {
       return element_dictionary()->FindEntry(index)
-          != NumberDictionary::kNotFound;
+          != SeededNumberDictionary::kNotFound;
     }
     case NON_STRICT_ARGUMENTS_ELEMENTS:
       UNIMPLEMENTED();
@@ -10247,7 +10388,7 @@ int JSObject::GetLocalElementKeys(FixedArray* storage,
       if (storage != NULL) {
         element_dictionary()->CopyKeysTo(storage,
                                          filter,
-                                         NumberDictionary::SORTED);
+                                         SeededNumberDictionary::SORTED);
       }
       counter += element_dictionary()->NumberOfElementsFilterAttributes(filter);
       break;
@@ -10259,9 +10400,11 @@ int JSObject::GetLocalElementKeys(FixedArray* storage,
       if (arguments->IsDictionary()) {
         // Copy the keys from arguments first, because Dictionary::CopyKeysTo
         // will insert in storage starting at index 0.
-        NumberDictionary* dictionary = NumberDictionary::cast(arguments);
+        SeededNumberDictionary* dictionary =
+            SeededNumberDictionary::cast(arguments);
         if (storage != NULL) {
-          dictionary->CopyKeysTo(storage, filter, NumberDictionary::UNSORTED);
+          dictionary->CopyKeysTo(
+              storage, filter, SeededNumberDictionary::UNSORTED);
         }
         counter += dictionary->NumberOfElementsFilterAttributes(filter);
         for (int i = 0; i < mapped_length; ++i) {
@@ -10585,7 +10728,7 @@ class SubStringAsciiSymbolKey : public HashTableKey {
   uint32_t Hash() {
     ASSERT(length_ >= 0);
     ASSERT(from_ + length_ <= string_->length());
-    StringHasher hasher(length_, string_->GetHeap()->StringHashSeed());
+    StringHasher hasher(length_, string_->GetHeap()->HashSeed());
 
     // Very long strings have a trivial hash that doesn't inspect the
     // string contents.
@@ -10794,7 +10937,7 @@ MaybeObject* HashTable<Shape, Key>::Rehash(HashTable* new_table, Key key) {
     uint32_t from_index = EntryToIndex(i);
     Object* k = get(from_index);
     if (IsKey(k)) {
-      uint32_t hash = Shape::HashForObject(key, k);
+      uint32_t hash = HashTable<Shape, Key>::HashForObject(key, k);
       uint32_t insertion_index =
           EntryToIndex(new_table->FindInsertionEntry(hash));
       for (int j = 0; j < Shape::kEntrySize; j++) {
@@ -10892,38 +11035,46 @@ template class HashTable<ObjectHashTableShape<2>, Object*>;
 
 template class Dictionary<StringDictionaryShape, String*>;
 
-template class Dictionary<NumberDictionaryShape, uint32_t>;
+template class Dictionary<SeededNumberDictionaryShape, uint32_t>;
 
-template MaybeObject* Dictionary<NumberDictionaryShape, uint32_t>::Allocate(
-    int);
+template class Dictionary<UnseededNumberDictionaryShape, uint32_t>;
+
+template MaybeObject* Dictionary<SeededNumberDictionaryShape, uint32_t>::
+    Allocate(int at_least_space_for);
+
+template MaybeObject* Dictionary<UnseededNumberDictionaryShape, uint32_t>::
+    Allocate(int at_least_space_for);
 
 template MaybeObject* Dictionary<StringDictionaryShape, String*>::Allocate(
     int);
 
-template MaybeObject* Dictionary<NumberDictionaryShape, uint32_t>::AtPut(
+template MaybeObject* Dictionary<SeededNumberDictionaryShape, uint32_t>::AtPut(
     uint32_t, Object*);
 
-template Object* Dictionary<NumberDictionaryShape, uint32_t>::SlowReverseLookup(
-    Object*);
+template MaybeObject* Dictionary<UnseededNumberDictionaryShape, uint32_t>::
+    AtPut(uint32_t, Object*);
+
+template Object* Dictionary<UnseededNumberDictionaryShape, uint32_t>::
+    SlowReverseLookup(Object* value);
 
 template Object* Dictionary<StringDictionaryShape, String*>::SlowReverseLookup(
     Object*);
 
-template void Dictionary<NumberDictionaryShape, uint32_t>::CopyKeysTo(
+template void Dictionary<SeededNumberDictionaryShape, uint32_t>::CopyKeysTo(
     FixedArray*,
     PropertyAttributes,
-    Dictionary<NumberDictionaryShape, uint32_t>::SortMode);
+    Dictionary<SeededNumberDictionaryShape, uint32_t>::SortMode);
 
 template Object* Dictionary<StringDictionaryShape, String*>::DeleteProperty(
     int, JSObject::DeleteMode);
 
-template Object* Dictionary<NumberDictionaryShape, uint32_t>::DeleteProperty(
-    int, JSObject::DeleteMode);
+template Object* Dictionary<SeededNumberDictionaryShape, uint32_t>::
+    DeleteProperty(int, JSObject::DeleteMode);
 
 template MaybeObject* Dictionary<StringDictionaryShape, String*>::Shrink(
     String*);
 
-template MaybeObject* Dictionary<NumberDictionaryShape, uint32_t>::Shrink(
+template MaybeObject* Dictionary<SeededNumberDictionaryShape, uint32_t>::Shrink(
     uint32_t);
 
 template void Dictionary<StringDictionaryShape, String*>::CopyKeysTo(
@@ -10942,32 +11093,41 @@ template MaybeObject*
 Dictionary<StringDictionaryShape, String*>::GenerateNewEnumerationIndices();
 
 template int
-Dictionary<NumberDictionaryShape, uint32_t>::NumberOfElementsFilterAttributes(
-    PropertyAttributes);
+Dictionary<SeededNumberDictionaryShape, uint32_t>::
+    NumberOfElementsFilterAttributes(PropertyAttributes);
 
-template MaybeObject* Dictionary<NumberDictionaryShape, uint32_t>::Add(
+template MaybeObject* Dictionary<SeededNumberDictionaryShape, uint32_t>::Add(
     uint32_t, Object*, PropertyDetails);
 
-template MaybeObject* Dictionary<NumberDictionaryShape, uint32_t>::
+template MaybeObject* Dictionary<UnseededNumberDictionaryShape, uint32_t>::Add(
+    uint32_t, Object*, PropertyDetails);
+
+template MaybeObject* Dictionary<SeededNumberDictionaryShape, uint32_t>::
+    EnsureCapacity(int, uint32_t);
+
+template MaybeObject* Dictionary<UnseededNumberDictionaryShape, uint32_t>::
     EnsureCapacity(int, uint32_t);
 
 template MaybeObject* Dictionary<StringDictionaryShape, String*>::
     EnsureCapacity(int, String*);
 
-template MaybeObject* Dictionary<NumberDictionaryShape, uint32_t>::AddEntry(
-    uint32_t, Object*, PropertyDetails, uint32_t);
+template MaybeObject* Dictionary<SeededNumberDictionaryShape, uint32_t>::
+    AddEntry(uint32_t, Object*, PropertyDetails, uint32_t);
+
+template MaybeObject* Dictionary<UnseededNumberDictionaryShape, uint32_t>::
+    AddEntry(uint32_t, Object*, PropertyDetails, uint32_t);
 
 template MaybeObject* Dictionary<StringDictionaryShape, String*>::AddEntry(
     String*, Object*, PropertyDetails, uint32_t);
 
 template
-int Dictionary<NumberDictionaryShape, uint32_t>::NumberOfEnumElements();
+int Dictionary<SeededNumberDictionaryShape, uint32_t>::NumberOfEnumElements();
 
 template
 int Dictionary<StringDictionaryShape, String*>::NumberOfEnumElements();
 
 template
-int HashTable<NumberDictionaryShape, uint32_t>::FindEntry(uint32_t);
+int HashTable<SeededNumberDictionaryShape, uint32_t>::FindEntry(uint32_t);
 
 
 // Collates undefined and unexisting elements below limit from position
@@ -10977,7 +11137,7 @@ MaybeObject* JSObject::PrepareSlowElementsForSort(uint32_t limit) {
   // Must stay in dictionary mode, either because of requires_slow_elements,
   // or because we are not going to sort (and therefore compact) all of the
   // elements.
-  NumberDictionary* dict = element_dictionary();
+  SeededNumberDictionary* dict = element_dictionary();
   HeapNumber* result_double = NULL;
   if (limit > static_cast<uint32_t>(Smi::kMaxValue)) {
     // Allocate space for result before we start mutating the object.
@@ -10990,10 +11150,10 @@ MaybeObject* JSObject::PrepareSlowElementsForSort(uint32_t limit) {
 
   Object* obj;
   { MaybeObject* maybe_obj =
-        NumberDictionary::Allocate(dict->NumberOfElements());
+        SeededNumberDictionary::Allocate(dict->NumberOfElements());
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   }
-  NumberDictionary* new_dict = NumberDictionary::cast(obj);
+  SeededNumberDictionary* new_dict = SeededNumberDictionary::cast(obj);
 
   AssertNoAllocation no_alloc;
 
@@ -11077,7 +11237,7 @@ MaybeObject* JSObject::PrepareElementsForSort(uint32_t limit) {
   if (HasDictionaryElements()) {
     // Convert to fast elements containing only the existing properties.
     // Ordering is irrelevant, since we are going to sort anyway.
-    NumberDictionary* dict = element_dictionary();
+    SeededNumberDictionary* dict = element_dictionary();
     if (IsJSArray() || dict->requires_slow_elements() ||
         dict->max_number_key() >= limit) {
       return PrepareSlowElementsForSort(limit);
@@ -11444,7 +11604,7 @@ class TwoCharHashTableKey : public HashTableKey {
     hash += hash << 3;
     hash ^= hash >> 11;
     hash += hash << 15;
-    if ((hash & String::kHashBitMask) == 0) hash = 27;
+    if ((hash & String::kHashBitMask) == 0) hash = String::kZeroHash;
 #ifdef DEBUG
     StringHasher hasher(2, seed);
     hasher.AddCharacter(c1);
@@ -11503,7 +11663,7 @@ bool SymbolTable::LookupSymbolIfExists(String* string, String** symbol) {
 bool SymbolTable::LookupTwoCharsSymbolIfExists(uint32_t c1,
                                                uint32_t c2,
                                                String** symbol) {
-  TwoCharHashTableKey key(c1, c2, GetHeap()->StringHashSeed());
+  TwoCharHashTableKey key(c1, c2, GetHeap()->HashSeed());
   int entry = FindEntry(&key);
   if (entry == kNotFound) {
     return false;
@@ -11518,14 +11678,14 @@ bool SymbolTable::LookupTwoCharsSymbolIfExists(uint32_t c1,
 
 MaybeObject* SymbolTable::LookupSymbol(Vector<const char> str,
                                        Object** s) {
-  Utf8SymbolKey key(str, GetHeap()->StringHashSeed());
+  Utf8SymbolKey key(str, GetHeap()->HashSeed());
   return LookupKey(&key, s);
 }
 
 
 MaybeObject* SymbolTable::LookupAsciiSymbol(Vector<const char> str,
                                             Object** s) {
-  AsciiSymbolKey key(str, GetHeap()->StringHashSeed());
+  AsciiSymbolKey key(str, GetHeap()->HashSeed());
   return LookupKey(&key, s);
 }
 
@@ -11534,14 +11694,14 @@ MaybeObject* SymbolTable::LookupSubStringAsciiSymbol(Handle<SeqAsciiString> str,
                                                      int from,
                                                      int length,
                                                      Object** s) {
-  SubStringAsciiSymbolKey key(str, from, length, GetHeap()->StringHashSeed());
+  SubStringAsciiSymbolKey key(str, from, length, GetHeap()->HashSeed());
   return LookupKey(&key, s);
 }
 
 
 MaybeObject* SymbolTable::LookupTwoByteSymbol(Vector<const uc16> str,
                                               Object** s) {
-  TwoByteSymbolKey key(str, GetHeap()->StringHashSeed());
+  TwoByteSymbolKey key(str, GetHeap()->HashSeed());
   return LookupKey(&key, s);
 }
 
@@ -11880,8 +12040,9 @@ MaybeObject* Dictionary<Shape, Key>::AtPut(Key key, Object* value) {
     if (!maybe_k->ToObject(&k)) return maybe_k;
   }
   PropertyDetails details = PropertyDetails(NONE, NORMAL);
-  return Dictionary<Shape, Key>::cast(obj)->
-      AddEntry(key, value, details, Shape::Hash(key));
+
+  return Dictionary<Shape, Key>::cast(obj)->AddEntry(key, value, details,
+      Dictionary<Shape, Key>::Hash(key));
 }
 
 
@@ -11896,8 +12057,9 @@ MaybeObject* Dictionary<Shape, Key>::Add(Key key,
   { MaybeObject* maybe_obj = EnsureCapacity(1, key);
     if (!maybe_obj->ToObject(&obj)) return maybe_obj;
   }
-  return Dictionary<Shape, Key>::cast(obj)->
-      AddEntry(key, value, details, Shape::Hash(key));
+
+  return Dictionary<Shape, Key>::cast(obj)->AddEntry(key, value, details,
+      Dictionary<Shape, Key>::Hash(key));
 }
 
 
@@ -11930,7 +12092,7 @@ MaybeObject* Dictionary<Shape, Key>::AddEntry(Key key,
 }
 
 
-void NumberDictionary::UpdateMaxNumberKey(uint32_t key) {
+void SeededNumberDictionary::UpdateMaxNumberKey(uint32_t key) {
   // If the dictionary requires slow elements an element has already
   // been added at a high index.
   if (requires_slow_elements()) return;
@@ -11949,31 +12111,65 @@ void NumberDictionary::UpdateMaxNumberKey(uint32_t key) {
 }
 
 
-MaybeObject* NumberDictionary::AddNumberEntry(uint32_t key,
-                                              Object* value,
-                                              PropertyDetails details) {
+MaybeObject* SeededNumberDictionary::AddNumberEntry(uint32_t key,
+                                                    Object* value,
+                                                    PropertyDetails details) {
   UpdateMaxNumberKey(key);
   SLOW_ASSERT(this->FindEntry(key) == kNotFound);
   return Add(key, value, details);
 }
 
 
-MaybeObject* NumberDictionary::AtNumberPut(uint32_t key, Object* value) {
+MaybeObject* UnseededNumberDictionary::AddNumberEntry(uint32_t key,
+                                                      Object* value) {
+  SLOW_ASSERT(this->FindEntry(key) == kNotFound);
+  return Add(key, value, PropertyDetails(NONE, NORMAL));
+}
+
+
+MaybeObject* SeededNumberDictionary::AtNumberPut(uint32_t key, Object* value) {
   UpdateMaxNumberKey(key);
   return AtPut(key, value);
 }
 
 
-MaybeObject* NumberDictionary::Set(uint32_t key,
-                                   Object* value,
-                                   PropertyDetails details) {
+MaybeObject* UnseededNumberDictionary::AtNumberPut(uint32_t key,
+                                                   Object* value) {
+  return AtPut(key, value);
+}
+
+
+Handle<SeededNumberDictionary> SeededNumberDictionary::Set(
+    Handle<SeededNumberDictionary> dictionary,
+    uint32_t index,
+    Handle<Object> value,
+    PropertyDetails details) {
+  CALL_HEAP_FUNCTION(dictionary->GetIsolate(),
+                     dictionary->Set(index, *value, details),
+                     SeededNumberDictionary);
+}
+
+
+Handle<UnseededNumberDictionary> UnseededNumberDictionary::Set(
+    Handle<UnseededNumberDictionary> dictionary,
+    uint32_t index,
+    Handle<Object> value) {
+  CALL_HEAP_FUNCTION(dictionary->GetIsolate(),
+                     dictionary->Set(index, *value),
+                     UnseededNumberDictionary);
+}
+
+
+MaybeObject* SeededNumberDictionary::Set(uint32_t key,
+                                         Object* value,
+                                         PropertyDetails details) {
   int entry = FindEntry(key);
   if (entry == kNotFound) return AddNumberEntry(key, value, details);
   // Preserve enumeration index.
   details = PropertyDetails(details.attributes(),
                             details.type(),
                             DetailsAt(entry).index());
-  MaybeObject* maybe_object_key = NumberDictionaryShape::AsObject(key);
+  MaybeObject* maybe_object_key = SeededNumberDictionaryShape::AsObject(key);
   Object* object_key;
   if (!maybe_object_key->ToObject(&object_key)) return maybe_object_key;
   SetEntry(entry, object_key, value, details);
@@ -11981,6 +12177,18 @@ MaybeObject* NumberDictionary::Set(uint32_t key,
 }
 
 
+MaybeObject* UnseededNumberDictionary::Set(uint32_t key,
+                                           Object* value) {
+  int entry = FindEntry(key);
+  if (entry == kNotFound) return AddNumberEntry(key, value);
+  MaybeObject* maybe_object_key = UnseededNumberDictionaryShape::AsObject(key);
+  Object* object_key;
+  if (!maybe_object_key->ToObject(&object_key)) return maybe_object_key;
+  SetEntry(entry, object_key, value);
+  return this;
+}
+
+
 
 template<typename Shape, typename Key>
 int Dictionary<Shape, Key>::NumberOfElementsFilterAttributes(
diff --git a/deps/v8/src/objects.h b/deps/v8/src/objects.h
index 541334a5d..791aeb364 100644
--- a/deps/v8/src/objects.h
+++ b/deps/v8/src/objects.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -107,6 +107,7 @@
 //       - SharedFunctionInfo
 //       - Struct
 //         - AccessorInfo
+//         - AccessorPair
 //         - AccessCheckInfo
 //         - InterceptorInfo
 //         - CallHandlerInfo
@@ -162,6 +163,11 @@ enum ElementsKind {
   LAST_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS
 };
 
+enum CompareMapMode {
+  REQUIRE_EXACT_MAP,
+  ALLOW_ELEMENT_TRANSITION_MAPS
+};
+
 const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1;
 
 void PrintElementsKind(FILE* out, ElementsKind kind);
@@ -270,6 +276,7 @@ const int kVariableSizeSentinel = 0;
   V(FILLER_TYPE)                                                               \
                                                                                \
   V(ACCESSOR_INFO_TYPE)                                                        \
+  V(ACCESSOR_PAIR_TYPE)                                                        \
   V(ACCESS_CHECK_INFO_TYPE)                                                    \
   V(INTERCEPTOR_INFO_TYPE)                                                     \
   V(CALL_HANDLER_INFO_TYPE)                                                    \
@@ -417,6 +424,7 @@ const int kVariableSizeSentinel = 0;
 // manually.
 #define STRUCT_LIST_ALL(V)                                                     \
   V(ACCESSOR_INFO, AccessorInfo, accessor_info)                                \
+  V(ACCESSOR_PAIR, AccessorPair, accessor_pair)                                \
   V(ACCESS_CHECK_INFO, AccessCheckInfo, access_check_info)                     \
   V(INTERCEPTOR_INFO, InterceptorInfo, interceptor_info)                       \
   V(CALL_HANDLER_INFO, CallHandlerInfo, call_handler_info)                     \
@@ -570,6 +578,7 @@ enum InstanceType {
 
   // Structs.
   ACCESSOR_INFO_TYPE,
+  ACCESSOR_PAIR_TYPE,
   ACCESS_CHECK_INFO_TYPE,
   INTERCEPTOR_INFO_TYPE,
   CALL_HANDLER_INFO_TYPE,
@@ -1342,6 +1351,11 @@ class JSReceiver: public HeapObject {
   // Casting.
   static inline JSReceiver* cast(Object* obj);
 
+  static Handle<Object> SetProperty(Handle<JSReceiver> object,
+                                    Handle<String> key,
+                                    Handle<Object> value,
+                                    PropertyAttributes attributes,
+                                    StrictModeFlag strict_mode);
   // Can cause GC.
   MUST_USE_RESULT MaybeObject* SetProperty(String* key,
                                            Object* value,
@@ -1471,7 +1485,7 @@ class JSObject: public JSReceiver {
   inline bool HasExternalDoubleElements();
   bool HasFastArgumentsElements();
   bool HasDictionaryArgumentsElements();
-  inline NumberDictionary* element_dictionary();  // Gets slow elements.
+  inline SeededNumberDictionary* element_dictionary();  // Gets slow elements.
 
   inline void set_map_and_elements(
       Map* map,
@@ -1521,6 +1535,14 @@ class JSObject: public JSReceiver {
       Object* value,
       PropertyAttributes attributes,
       StrictModeFlag strict_mode);
+
+  static Handle<Object> SetLocalPropertyIgnoreAttributes(
+      Handle<JSObject> object,
+      Handle<String> key,
+      Handle<Object> value,
+      PropertyAttributes attributes);
+
+  // Can cause GC.
   MUST_USE_RESULT MaybeObject* SetLocalPropertyIgnoreAttributes(
       String* key,
       Object* value,
@@ -1536,6 +1558,11 @@ class JSObject: public JSReceiver {
 
   // Sets the property value in a normalized object given (key, value, details).
   // Handles the special representation of JS global objects.
+  static Handle<Object> SetNormalizedProperty(Handle<JSObject> object,
+                                              Handle<String> key,
+                                              Handle<Object> value,
+                                              PropertyDetails details);
+
   MUST_USE_RESULT MaybeObject* SetNormalizedProperty(String* name,
                                                      Object* value,
                                                      PropertyDetails details);
@@ -1605,8 +1632,11 @@ class JSObject: public JSReceiver {
   // hidden properties.
 
   // Sets a hidden property on this object. Returns this object if successful,
-  // undefined if called on a detached proxy, and a failure if a GC
-  // is required
+  // undefined if called on a detached proxy.
+  static Handle<Object> SetHiddenProperty(Handle<JSObject> obj,
+                                          Handle<String> key,
+                                          Handle<Object> value);
+  // Returns a failure if a GC is required.
   MaybeObject* SetHiddenProperty(String* key, Object* value);
   // Gets the value of a hidden property with the given key. Returns undefined
   // if the property doesn't exist (or if called on a detached proxy),
@@ -1618,10 +1648,15 @@ class JSObject: public JSReceiver {
   // Returns true if the object has a property with the hidden symbol as name.
   bool HasHiddenProperties();
 
+  static int GetIdentityHash(Handle<JSObject> obj);
   MUST_USE_RESULT MaybeObject* GetIdentityHash(CreationFlag flag);
   MUST_USE_RESULT MaybeObject* SetIdentityHash(Object* hash, CreationFlag flag);
 
+  static Handle<Object> DeleteProperty(Handle<JSObject> obj,
+                                       Handle<String> name);
   MUST_USE_RESULT MaybeObject* DeleteProperty(String* name, DeleteMode mode);
+
+  static Handle<Object> DeleteElement(Handle<JSObject> obj, uint32_t index);
   MUST_USE_RESULT MaybeObject* DeleteElement(uint32_t index, DeleteMode mode);
 
   inline void ValidateSmiOnlyElements();
@@ -1701,7 +1736,18 @@ class JSObject: public JSReceiver {
       StrictModeFlag strict_mode,
       bool check_prototype = true);
 
-  // Set the index'th array element.
+
+  static Handle<Object> SetOwnElement(Handle<JSObject> object,
+                                      uint32_t index,
+                                      Handle<Object> value,
+                                      StrictModeFlag strict_mode);
+
+  // Empty handle is returned if the element cannot be set to the given value.
+  static MUST_USE_RESULT Handle<Object> SetElement(Handle<JSObject> object,
+                                                   uint32_t index,
+                                                   Handle<Object> value,
+                                                   StrictModeFlag strict_mode);
+
   // A Failure object is returned if GC is needed.
   MUST_USE_RESULT MaybeObject* SetElement(uint32_t index,
                                           Object* value,
@@ -1811,6 +1857,9 @@ class JSObject: public JSReceiver {
   MUST_USE_RESULT MaybeObject* GetElementsTransitionMap(
       ElementsKind elements_kind);
 
+  static Handle<Object> TransitionElementsKind(Handle<JSObject> object,
+                                               ElementsKind to_kind);
+
   MUST_USE_RESULT MaybeObject* TransitionElementsKind(ElementsKind to_kind);
 
   // Converts a descriptor of any other type to a real field,
@@ -1851,12 +1900,19 @@ class JSObject: public JSReceiver {
   // representation. If the object is expected to have additional properties
   // added this number can be indicated to have the backing store allocated to
   // an initial capacity for holding these properties.
+  static void NormalizeProperties(Handle<JSObject> object,
+                                  PropertyNormalizationMode mode,
+                                  int expected_additional_properties);
+
   MUST_USE_RESULT MaybeObject* NormalizeProperties(
       PropertyNormalizationMode mode,
       int expected_additional_properties);
 
-  // Convert and update the elements backing store to be a NumberDictionary
-  // dictionary.  Returns the backing after conversion.
+  // Convert and update the elements backing store to be a
+  // SeededNumberDictionary dictionary.  Returns the backing after conversion.
+  static Handle<SeededNumberDictionary> NormalizeElements(
+      Handle<JSObject> object);
+
   MUST_USE_RESULT MaybeObject* NormalizeElements();
 
   static void UpdateMapCodeCache(Handle<JSObject> object,
@@ -1867,6 +1923,9 @@ class JSObject: public JSReceiver {
 
   // Transform slow named properties to fast variants.
   // Returns failure if allocation failed.
+  static void TransformToFastProperties(Handle<JSObject> object,
+                                        int unused_property_fields);
+
   MUST_USE_RESULT MaybeObject* TransformToFastProperties(
       int unused_property_fields);
 
@@ -1898,6 +1957,7 @@ class JSObject: public JSReceiver {
   static inline JSObject* cast(Object* obj);
 
   // Disalow further properties to be added to the object.
+  static Handle<Object> PreventExtensions(Handle<JSObject> object);
   MUST_USE_RESULT MaybeObject* PreventExtensions();
 
 
@@ -1951,11 +2011,6 @@ class JSObject: public JSReceiver {
 #endif
   Object* SlowReverseLookup(Object* value);
 
-  // Getters and setters are stored in a fixed array property.
-  // These are constants for their indices.
-  static const int kGetterIndex = 0;
-  static const int kSetterIndex = 1;
-
   // Maximal number of fast properties for the JSObject. Used to
   // restrict the number of map transitions to avoid an explosion in
   // the number of maps for objects used as dictionaries.
@@ -2223,7 +2278,7 @@ class FixedDoubleArray: public FixedArrayBase {
  public:
   inline void Initialize(FixedArray* from);
   inline void Initialize(FixedDoubleArray* from);
-  inline void Initialize(NumberDictionary* from);
+  inline void Initialize(SeededNumberDictionary* from);
 
   // Setter and getter for elements.
   inline double get_scalar(int index);
@@ -2538,9 +2593,44 @@ class DescriptorArray: public FixedArray {
 // beginning of the backing storage that can be used for non-element
 // information by subclasses.
 
+template<typename Key>
+class BaseShape {
+ public:
+  static const bool UsesSeed = false;
+  static uint32_t Hash(Key key) { return 0; }
+  static uint32_t SeededHash(Key key, uint32_t seed) {
+    ASSERT(UsesSeed);
+    return Hash(key);
+  }
+  static uint32_t HashForObject(Key key, Object* object) { return 0; }
+  static uint32_t SeededHashForObject(Key key, uint32_t seed, Object* object) {
+    ASSERT(UsesSeed);
+    return HashForObject(key, object);
+  }
+};
+
 template<typename Shape, typename Key>
 class HashTable: public FixedArray {
  public:
+  // Wrapper methods
+  inline uint32_t Hash(Key key) {
+    if (Shape::UsesSeed) {
+      return Shape::SeededHash(key,
+          GetHeap()->HashSeed());
+    } else {
+      return Shape::Hash(key);
+    }
+  }
+
+  inline uint32_t HashForObject(Key key, Object* object) {
+    if (Shape::UsesSeed) {
+      return Shape::SeededHashForObject(key,
+          GetHeap()->HashSeed(), object);
+    } else {
+      return Shape::HashForObject(key, object);
+    }
+  }
+
   // Returns the number of elements in the hash table.
   int NumberOfElements() {
     return Smi::cast(get(kNumberOfElementsIndex))->value();
@@ -2682,7 +2772,6 @@ class HashTable: public FixedArray {
 };
 
 
-
 // HashTableKey is an abstract superclass for virtual key behavior.
 class HashTableKey {
  public:
@@ -2699,7 +2788,8 @@ class HashTableKey {
   virtual ~HashTableKey() {}
 };
 
-class SymbolTableShape {
+
+class SymbolTableShape : public BaseShape<HashTableKey*> {
  public:
   static inline bool IsMatch(HashTableKey* key, Object* value) {
     return key->IsMatch(value);
@@ -2758,7 +2848,7 @@ class SymbolTable: public HashTable<SymbolTableShape, HashTableKey*> {
 };
 
 
-class MapCacheShape {
+class MapCacheShape : public BaseShape<HashTableKey*> {
  public:
   static inline bool IsMatch(HashTableKey* key, Object* value) {
     return key->IsMatch(value);
@@ -2914,7 +3004,7 @@ class Dictionary: public HashTable<Shape, Key> {
 };
 
 
-class StringDictionaryShape {
+class StringDictionaryShape : public BaseShape<String*> {
  public:
   static inline bool IsMatch(String* key, Object* other);
   static inline uint32_t Hash(String* key);
@@ -2947,23 +3037,42 @@ class StringDictionary: public Dictionary<StringDictionaryShape, String*> {
 };
 
 
-class NumberDictionaryShape {
+class NumberDictionaryShape : public BaseShape<uint32_t> {
  public:
   static inline bool IsMatch(uint32_t key, Object* other);
-  static inline uint32_t Hash(uint32_t key);
-  static inline uint32_t HashForObject(uint32_t key, Object* object);
   MUST_USE_RESULT static inline MaybeObject* AsObject(uint32_t key);
-  static const int kPrefixSize = 2;
   static const int kEntrySize = 3;
   static const bool kIsEnumerable = false;
 };
 
 
-class NumberDictionary: public Dictionary<NumberDictionaryShape, uint32_t> {
+class SeededNumberDictionaryShape : public NumberDictionaryShape {
+ public:
+  static const bool UsesSeed = true;
+  static const int kPrefixSize = 2;
+
+  static inline uint32_t SeededHash(uint32_t key, uint32_t seed);
+  static inline uint32_t SeededHashForObject(uint32_t key,
+                                             uint32_t seed,
+                                             Object* object);
+};
+
+
+class UnseededNumberDictionaryShape : public NumberDictionaryShape {
  public:
-  static NumberDictionary* cast(Object* obj) {
+  static const int kPrefixSize = 0;
+
+  static inline uint32_t Hash(uint32_t key);
+  static inline uint32_t HashForObject(uint32_t key, Object* object);
+};
+
+
+class SeededNumberDictionary
+    : public Dictionary<SeededNumberDictionaryShape, uint32_t> {
+ public:
+  static SeededNumberDictionary* cast(Object* obj) {
     ASSERT(obj->IsDictionary());
-    return reinterpret_cast<NumberDictionary*>(obj);
+    return reinterpret_cast<SeededNumberDictionary*>(obj);
   }
 
   // Type specific at put (default NONE attributes is used when adding).
@@ -2973,6 +3082,13 @@ class NumberDictionary: public Dictionary<NumberDictionaryShape, uint32_t> {
                                               PropertyDetails details);
 
   // Set an existing entry or add a new one if needed.
+  // Return the updated dictionary.
+  MUST_USE_RESULT static Handle<SeededNumberDictionary> Set(
+      Handle<SeededNumberDictionary> dictionary,
+      uint32_t index,
+      Handle<Object> value,
+      PropertyDetails details);
+
   MUST_USE_RESULT MaybeObject* Set(uint32_t key,
                                    Object* value,
                                    PropertyDetails details);
@@ -2999,8 +3115,31 @@ class NumberDictionary: public Dictionary<NumberDictionaryShape, uint32_t> {
 };
 
 
+class UnseededNumberDictionary
+    : public Dictionary<UnseededNumberDictionaryShape, uint32_t> {
+ public:
+  static UnseededNumberDictionary* cast(Object* obj) {
+    ASSERT(obj->IsDictionary());
+    return reinterpret_cast<UnseededNumberDictionary*>(obj);
+  }
+
+  // Type specific at put (default NONE attributes is used when adding).
+  MUST_USE_RESULT MaybeObject* AtNumberPut(uint32_t key, Object* value);
+  MUST_USE_RESULT MaybeObject* AddNumberEntry(uint32_t key, Object* value);
+
+  // Set an existing entry or add a new one if needed.
+  // Return the updated dictionary.
+  MUST_USE_RESULT static Handle<UnseededNumberDictionary> Set(
+      Handle<UnseededNumberDictionary> dictionary,
+      uint32_t index,
+      Handle<Object> value);
+
+  MUST_USE_RESULT MaybeObject* Set(uint32_t key, Object* value);
+};
+
+
 template <int entrysize>
-class ObjectHashTableShape {
+class ObjectHashTableShape : public BaseShape<Object*> {
  public:
   static inline bool IsMatch(Object* key, Object* other);
   static inline uint32_t Hash(Object* key);
@@ -4791,7 +4930,10 @@ class Script: public Struct {
   V(Math, atan, MathATan)                           \
   V(Math, exp, MathExp)                             \
   V(Math, sqrt, MathSqrt)                           \
-  V(Math, pow, MathPow)
+  V(Math, pow, MathPow)                             \
+  V(Math, random, MathRandom)                       \
+  V(Math, max, MathMax)                             \
+  V(Math, min, MathMin)
 
 
 enum BuiltinFunctionId {
@@ -5912,7 +6054,7 @@ class JSRegExp: public JSObject {
 };
 
 
-class CompilationCacheShape {
+class CompilationCacheShape : public BaseShape<HashTableKey*> {
  public:
   static inline bool IsMatch(HashTableKey* key, Object* value) {
     return key->IsMatch(value);
@@ -6016,7 +6158,7 @@ class CodeCache: public Struct {
 };
 
 
-class CodeCacheHashTableShape {
+class CodeCacheHashTableShape : public BaseShape<HashTableKey*> {
  public:
   static inline bool IsMatch(HashTableKey* key, Object* value) {
     return key->IsMatch(value);
@@ -6148,6 +6290,11 @@ class StringHasher {
   // value is represented decimal value.
   static uint32_t MakeArrayIndexHash(uint32_t value, int length);
 
+  // No string is allowed to have a hash of zero.  That value is reserved
+  // for internal properties.  If the hash calculation yields zero then we
+  // use 27 instead.
+  static const int kZeroHash = 27;
+
  private:
   uint32_t array_index() {
     ASSERT(is_array_index());
@@ -7528,6 +7675,35 @@ class AccessorInfo: public Struct {
 };
 
 
+// Support for JavaScript accessors: A pair of a getter and a setter. Each
+// accessor can either be
+//   * a pointer to a JavaScript function or proxy: a real accessor
+//   * undefined: considered an accessor by the spec, too, strangely enough
+//   * the hole: an accessor which has not been set
+//   * a pointer to a map: a transition used to ensure map sharing
+class AccessorPair: public Struct {
+ public:
+  DECL_ACCESSORS(getter, Object)
+  DECL_ACCESSORS(setter, Object)
+
+  static inline AccessorPair* cast(Object* obj);
+
+#ifdef OBJECT_PRINT
+  void AccessorPairPrint(FILE* out = stdout);
+#endif
+#ifdef DEBUG
+  void AccessorPairVerify();
+#endif
+
+  static const int kGetterOffset = HeapObject::kHeaderSize;
+  static const int kSetterOffset = kGetterOffset + kPointerSize;
+  static const int kSize = kSetterOffset + kPointerSize;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(AccessorPair);
+};
+
+
 class AccessCheckInfo: public Struct {
  public:
   DECL_ACCESSORS(named_callback, Object)
diff --git a/deps/v8/src/parser.cc b/deps/v8/src/parser.cc
index c1681cfbd..777436ee0 100644
--- a/deps/v8/src/parser.cc
+++ b/deps/v8/src/parser.cc
@@ -1186,8 +1186,8 @@ void* Parser::ParseSourceElements(ZoneList<Statement*>* processor,
 
     if (directive_prologue) {
       // A shot at a directive.
-      ExpressionStatement *e_stat;
-      Literal *literal;
+      ExpressionStatement* e_stat;
+      Literal* literal;
       // Still processing directive prologue?
       if ((e_stat = stat->AsExpressionStatement()) != NULL &&
           (literal = e_stat->expression()->AsLiteral()) != NULL &&
@@ -1562,7 +1562,7 @@ Statement* Parser::ParseNativeDeclaration(bool* ok) {
 
   // TODO(1240846): It's weird that native function declarations are
   // introduced dynamically when we meet their declarations, whereas
-  // other functions are setup when entering the surrounding scope.
+  // other functions are set up when entering the surrounding scope.
   SharedFunctionInfoLiteral* lit =
       new(zone()) SharedFunctionInfoLiteral(isolate(), shared);
   VariableProxy* var = Declare(name, VAR, NULL, true, CHECK_OK);
@@ -3003,7 +3003,19 @@ Expression* Parser::ParseLeftHandSideExpression(bool* ok) {
       }
 
       case Token::LPAREN: {
-        int pos = scanner().location().beg_pos;
+        int pos;
+        if (scanner().current_token() == Token::IDENTIFIER) {
+          // For call of an identifier we want to report position of
+          // the identifier as position of the call in the stack trace.
+          pos = scanner().location().beg_pos;
+        } else {
+          // For other kinds of calls we record position of the parenthesis as
+          // position of the call.  Note that this is extremely important for
+          // expressions of the form function(){...}() for which call position
+          // should not point to the closing brace otherwise it will intersect
+          // with positions recorded for function literal and confuse debugger.
+          pos = scanner().peek_location().beg_pos;
+        }
         ZoneList<Expression*>* args = ParseArguments(CHECK_OK);
 
         // Keep track of eval() calls since they disable all local variable
@@ -3595,7 +3607,7 @@ void ObjectLiteralPropertyChecker::CheckProperty(
 
   ASSERT(property != NULL);
 
-  Literal *lit = property->key();
+  Literal* lit = property->key();
   Handle<Object> handle = lit->handle();
 
   uint32_t hash;
diff --git a/deps/v8/src/platform-cygwin.cc b/deps/v8/src/platform-cygwin.cc
index a72f5da4b..9b34de91c 100644
--- a/deps/v8/src/platform-cygwin.cc
+++ b/deps/v8/src/platform-cygwin.cc
@@ -61,7 +61,7 @@ double ceiling(double x) {
 static Mutex* limit_mutex = NULL;
 
 
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator.
   // Convert the current time to a 64-bit integer first, before converting it
   // to an unsigned. Going directly can cause an overflow and the seed to be
@@ -290,7 +290,7 @@ void OS::LogSharedLibraryAddresses() {
       }
       LOG(isolate, SharedLibraryEvent(lib_name, start, end));
     } else {
-      // Entry not describing executable data. Skip to end of line to setup
+      // Entry not describing executable data. Skip to end of line to set up
       // reading the next entry.
       do {
         c = getc(fp);
diff --git a/deps/v8/src/platform-freebsd.cc b/deps/v8/src/platform-freebsd.cc
index 20bd83793..7d0d8d026 100644
--- a/deps/v8/src/platform-freebsd.cc
+++ b/deps/v8/src/platform-freebsd.cc
@@ -79,7 +79,7 @@ double ceiling(double x) {
 static Mutex* limit_mutex = NULL;
 
 
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator.
   // Convert the current time to a 64-bit integer first, before converting it
   // to an unsigned. Going directly can cause an overflow and the seed to be
diff --git a/deps/v8/src/platform-linux.cc b/deps/v8/src/platform-linux.cc
index e72d095b0..a3cdc031e 100644
--- a/deps/v8/src/platform-linux.cc
+++ b/deps/v8/src/platform-linux.cc
@@ -78,7 +78,7 @@ double ceiling(double x) {
 static Mutex* limit_mutex = NULL;
 
 
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator. We preserve microsecond resolution.
   uint64_t seed = Ticks() ^ (getpid() << 16);
   srandom(static_cast<unsigned int>(seed));
@@ -512,7 +512,7 @@ void OS::LogSharedLibraryAddresses() {
       }
       LOG(isolate, SharedLibraryEvent(lib_name, start, end));
     } else {
-      // Entry not describing executable data. Skip to end of line to setup
+      // Entry not describing executable data. Skip to end of line to set up
       // reading the next entry.
       do {
         c = getc(fp);
diff --git a/deps/v8/src/platform-macos.cc b/deps/v8/src/platform-macos.cc
index 6e5d29da2..417fb11ae 100644
--- a/deps/v8/src/platform-macos.cc
+++ b/deps/v8/src/platform-macos.cc
@@ -93,7 +93,7 @@ double ceiling(double x) {
 static Mutex* limit_mutex = NULL;
 
 
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator. We preserve microsecond resolution.
   uint64_t seed = Ticks() ^ (getpid() << 16);
   srandom(static_cast<unsigned int>(seed));
diff --git a/deps/v8/src/platform-nullos.cc b/deps/v8/src/platform-nullos.cc
index 8c2a8633d..094f950f7 100644
--- a/deps/v8/src/platform-nullos.cc
+++ b/deps/v8/src/platform-nullos.cc
@@ -56,7 +56,7 @@ double modulo(double x, double y) {
 
 
 // Initialize OS class early in the V8 startup.
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator.
   UNIMPLEMENTED();
 }
diff --git a/deps/v8/src/platform-openbsd.cc b/deps/v8/src/platform-openbsd.cc
index 772d08b58..6f582d434 100644
--- a/deps/v8/src/platform-openbsd.cc
+++ b/deps/v8/src/platform-openbsd.cc
@@ -99,7 +99,7 @@ static void* GetRandomMmapAddr() {
 }
 
 
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator. We preserve microsecond resolution.
   uint64_t seed = Ticks() ^ (getpid() << 16);
   srandom(static_cast<unsigned int>(seed));
@@ -312,7 +312,7 @@ void OS::LogSharedLibraryAddresses() {
       }
       LOG(isolate, SharedLibraryEvent(lib_name, start, end));
     } else {
-      // Entry not describing executable data. Skip to end of line to setup
+      // Entry not describing executable data. Skip to end of line to set up
       // reading the next entry.
       do {
         c = getc(fp);
diff --git a/deps/v8/src/platform-posix.cc b/deps/v8/src/platform-posix.cc
index 08417ff9b..34fd5c449 100644
--- a/deps/v8/src/platform-posix.cc
+++ b/deps/v8/src/platform-posix.cc
@@ -461,7 +461,7 @@ bool POSIXSocket::SetReuseAddress(bool reuse_address) {
 }
 
 
-bool Socket::Setup() {
+bool Socket::SetUp() {
   // Nothing to do on POSIX.
   return true;
 }
diff --git a/deps/v8/src/platform-solaris.cc b/deps/v8/src/platform-solaris.cc
index 035d39445..d55ea8913 100644
--- a/deps/v8/src/platform-solaris.cc
+++ b/deps/v8/src/platform-solaris.cc
@@ -89,7 +89,7 @@ double ceiling(double x) {
 
 
 static Mutex* limit_mutex = NULL;
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator.
   // Convert the current time to a 64-bit integer first, before converting it
   // to an unsigned. Going directly will cause an overflow and the seed to be
diff --git a/deps/v8/src/platform-win32.cc b/deps/v8/src/platform-win32.cc
index 822f36064..c439ab91a 100644
--- a/deps/v8/src/platform-win32.cc
+++ b/deps/v8/src/platform-win32.cc
@@ -528,7 +528,7 @@ char* Time::LocalTimezone() {
 }
 
 
-void OS::Setup() {
+void OS::SetUp() {
   // Seed the random number generator.
   // Convert the current time to a 64-bit integer first, before converting it
   // to an unsigned. Going directly can cause an overflow and the seed to be
@@ -1825,7 +1825,7 @@ bool Win32Socket::SetReuseAddress(bool reuse_address) {
 }
 
 
-bool Socket::Setup() {
+bool Socket::SetUp() {
   // Initialize Winsock32
   int err;
   WSADATA winsock_data;
diff --git a/deps/v8/src/platform.h b/deps/v8/src/platform.h
index 127f788f9..fc12df2d7 100644
--- a/deps/v8/src/platform.h
+++ b/deps/v8/src/platform.h
@@ -109,7 +109,7 @@ class Socket;
 class OS {
  public:
   // Initializes the platform OS support. Called once at VM startup.
-  static void Setup();
+  static void SetUp();
 
   // Returns the accumulated user time for thread. This routine
   // can be used for profiling. The implementation should
@@ -477,7 +477,7 @@ class Thread {
   PlatformData* data() { return data_; }
 
  private:
-  void set_name(const char *name);
+  void set_name(const char* name);
 
   PlatformData* data_;
 
@@ -553,7 +553,7 @@ class Semaphore {
   virtual void Wait() = 0;
 
   // Suspends the calling thread until the counter is non zero or the timeout
-  // time has passsed. If timeout happens the return value is false and the
+  // time has passed. If timeout happens the return value is false and the
   // counter is unchanged. Otherwise the semaphore counter is decremented and
   // true is returned. The timeout value is specified in microseconds.
   virtual bool Wait(int timeout) = 0;
@@ -593,7 +593,7 @@ class Socket {
 
   virtual bool IsValid() const = 0;
 
-  static bool Setup();
+  static bool SetUp();
   static int LastError();
   static uint16_t HToN(uint16_t value);
   static uint16_t NToH(uint16_t value);
diff --git a/deps/v8/src/preparser.h b/deps/v8/src/preparser.h
index fc8a4a0ca..f17bac2ea 100644
--- a/deps/v8/src/preparser.h
+++ b/deps/v8/src/preparser.h
@@ -630,7 +630,7 @@ class PreParser {
 
   void SetStrictModeViolation(i::Scanner::Location,
                               const char* type,
-                              bool *ok);
+                              bool* ok);
 
   void CheckDelayedStrictModeViolation(int beg_pos, int end_pos, bool* ok);
 
diff --git a/deps/v8/src/profile-generator.cc b/deps/v8/src/profile-generator.cc
index 00fc7b736..97de08e5b 100644
--- a/deps/v8/src/profile-generator.cc
+++ b/deps/v8/src/profile-generator.cc
@@ -111,7 +111,7 @@ const char* StringsStorage::GetCopy(const char* src) {
   OS::StrNCpy(dst, src, len);
   dst[len] = '\0';
   uint32_t hash =
-      HashSequentialString(dst.start(), len, HEAP->StringHashSeed());
+      HashSequentialString(dst.start(), len, HEAP->HashSeed());
   return AddOrDisposeString(dst.start(), hash);
 }
 
@@ -145,7 +145,7 @@ const char* StringsStorage::GetVFormatted(const char* format, va_list args) {
     return format;
   }
   uint32_t hash = HashSequentialString(
-      str.start(), len, HEAP->StringHashSeed());
+      str.start(), len, HEAP->HashSeed());
   return AddOrDisposeString(str.start(), hash);
 }
 
@@ -156,7 +156,7 @@ const char* StringsStorage::GetName(String* name) {
     SmartArrayPointer<char> data =
         name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL, 0, length);
     uint32_t hash =
-        HashSequentialString(*data, length, name->GetHeap()->StringHashSeed());
+        HashSequentialString(*data, length, name->GetHeap()->HashSeed());
     return AddOrDisposeString(data.Detach(), hash);
   }
   return "";
@@ -181,18 +181,21 @@ void CodeEntry::CopyData(const CodeEntry& source) {
 
 
 uint32_t CodeEntry::GetCallUid() const {
-  uint32_t hash = ComputeIntegerHash(tag_);
+  uint32_t hash = ComputeIntegerHash(tag_, v8::internal::kZeroHashSeed);
   if (shared_id_ != 0) {
-    hash ^= ComputeIntegerHash(
-        static_cast<uint32_t>(shared_id_));
+    hash ^= ComputeIntegerHash(static_cast<uint32_t>(shared_id_),
+                               v8::internal::kZeroHashSeed);
   } else {
     hash ^= ComputeIntegerHash(
-        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name_prefix_)));
+        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name_prefix_)),
+        v8::internal::kZeroHashSeed);
     hash ^= ComputeIntegerHash(
-        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name_)));
+        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(name_)),
+        v8::internal::kZeroHashSeed);
     hash ^= ComputeIntegerHash(
-        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(resource_name_)));
-    hash ^= ComputeIntegerHash(line_number_);
+        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(resource_name_)),
+        v8::internal::kZeroHashSeed);
+    hash ^= ComputeIntegerHash(line_number_, v8::internal::kZeroHashSeed);
   }
   return hash;
 }
@@ -901,7 +904,7 @@ void ProfileGenerator::RecordTickSample(const TickSample& sample) {
       entry++;
     }
 
-    for (const Address *stack_pos = sample.stack,
+    for (const Address* stack_pos = sample.stack,
            *stack_end = stack_pos + sample.frames_count;
          stack_pos != stack_end;
          ++stack_pos) {
@@ -1228,10 +1231,10 @@ HeapSnapshot::HeapSnapshot(HeapSnapshotsCollection* collection,
       entries_sorted_(false) {
   STATIC_ASSERT(
       sizeof(HeapGraphEdge) ==
-      SnapshotSizeConstants<sizeof(void*)>::kExpectedHeapGraphEdgeSize);  // NOLINT
+      SnapshotSizeConstants<kPointerSize>::kExpectedHeapGraphEdgeSize);
   STATIC_ASSERT(
       sizeof(HeapEntry) ==
-      SnapshotSizeConstants<sizeof(void*)>::kExpectedHeapEntrySize);  // NOLINT
+      SnapshotSizeConstants<kPointerSize>::kExpectedHeapEntrySize);
   for (int i = 0; i < VisitorSynchronization::kNumberOfSyncTags; ++i) {
     gc_subroot_entries_[i] = NULL;
   }
@@ -1506,10 +1509,11 @@ uint64_t HeapObjectsMap::GenerateId(v8::RetainedObjectInfo* info) {
   const char* label = info->GetLabel();
   id ^= HashSequentialString(label,
                              static_cast<int>(strlen(label)),
-                             HEAP->StringHashSeed());
+                             HEAP->HashSeed());
   intptr_t element_count = info->GetElementCount();
   if (element_count != -1)
-    id ^= ComputeIntegerHash(static_cast<uint32_t>(element_count));
+    id ^= ComputeIntegerHash(static_cast<uint32_t>(element_count),
+                             v8::internal::kZeroHashSeed);
   return id << 1;
 }
 
@@ -1591,7 +1595,7 @@ Handle<HeapObject> HeapSnapshotsCollection::FindHeapObjectById(uint64_t id) {
 }
 
 
-HeapEntry *const HeapEntriesMap::kHeapEntryPlaceholder =
+HeapEntry* const HeapEntriesMap::kHeapEntryPlaceholder =
     reinterpret_cast<HeapEntry*>(1);
 
 HeapEntriesMap::HeapEntriesMap()
@@ -1720,16 +1724,16 @@ void HeapObjectsSet::SetTag(Object* obj, const char* tag) {
 }
 
 
-HeapObject *const V8HeapExplorer::kInternalRootObject =
+HeapObject* const V8HeapExplorer::kInternalRootObject =
     reinterpret_cast<HeapObject*>(
         static_cast<intptr_t>(HeapObjectsMap::kInternalRootObjectId));
-HeapObject *const V8HeapExplorer::kGcRootsObject =
+HeapObject* const V8HeapExplorer::kGcRootsObject =
     reinterpret_cast<HeapObject*>(
         static_cast<intptr_t>(HeapObjectsMap::kGcRootsObjectId));
-HeapObject *const V8HeapExplorer::kFirstGcSubrootObject =
+HeapObject* const V8HeapExplorer::kFirstGcSubrootObject =
     reinterpret_cast<HeapObject*>(
         static_cast<intptr_t>(HeapObjectsMap::kGcRootsFirstSubrootId));
-HeapObject *const V8HeapExplorer::kLastGcSubrootObject =
+HeapObject* const V8HeapExplorer::kLastGcSubrootObject =
     reinterpret_cast<HeapObject*>(
         static_cast<intptr_t>(HeapObjectsMap::kFirstAvailableObjectId));
 
@@ -2226,13 +2230,13 @@ void V8HeapExplorer::ExtractPropertyReferences(JSObject* js_obj,
           break;
         case CALLBACKS: {
           Object* callback_obj = descs->GetValue(i);
-          if (callback_obj->IsFixedArray()) {
-            FixedArray* accessors = FixedArray::cast(callback_obj);
-            if (Object* getter = accessors->get(JSObject::kGetterIndex)) {
+          if (callback_obj->IsAccessorPair()) {
+            AccessorPair* accessors = AccessorPair::cast(callback_obj);
+            if (Object* getter = accessors->getter()) {
               SetPropertyReference(js_obj, entry, descs->GetKey(i),
                                    getter, "get-%s");
             }
-            if (Object* setter = accessors->get(JSObject::kSetterIndex)) {
+            if (Object* setter = accessors->setter()) {
               SetPropertyReference(js_obj, entry, descs->GetKey(i),
                                    setter, "set-%s");
             }
@@ -2285,7 +2289,7 @@ void V8HeapExplorer::ExtractElementReferences(JSObject* js_obj,
       }
     }
   } else if (js_obj->HasDictionaryElements()) {
-    NumberDictionary* dictionary = js_obj->element_dictionary();
+    SeededNumberDictionary* dictionary = js_obj->element_dictionary();
     int length = dictionary->Capacity();
     for (int i = 0; i < length; ++i) {
       Object* k = dictionary->KeyAt(i);
diff --git a/deps/v8/src/profile-generator.h b/deps/v8/src/profile-generator.h
index b47ce8255..aefe1a0f6 100644
--- a/deps/v8/src/profile-generator.h
+++ b/deps/v8/src/profile-generator.h
@@ -750,7 +750,8 @@ class HeapObjectsMap {
 
   static uint32_t AddressHash(Address addr) {
     return ComputeIntegerHash(
-        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(addr)));
+        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(addr)),
+        v8::internal::kZeroHashSeed);
   }
 
   bool initial_fill_mode_;
@@ -833,7 +834,7 @@ class HeapEntriesMap {
   int total_children_count() { return total_children_count_; }
   int total_retainers_count() { return total_retainers_count_; }
 
-  static HeapEntry *const kHeapEntryPlaceholder;
+  static HeapEntry* const kHeapEntryPlaceholder;
 
  private:
   struct EntryInfo {
@@ -851,7 +852,8 @@ class HeapEntriesMap {
 
   static uint32_t Hash(HeapThing thing) {
     return ComputeIntegerHash(
-        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(thing)));
+        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(thing)),
+        v8::internal::kZeroHashSeed);
   }
   static bool HeapThingsMatch(HeapThing key1, HeapThing key2) {
     return key1 == key2;
@@ -1047,7 +1049,8 @@ class NativeObjectsExplorer : public HeapEntriesAllocator {
   void VisitSubtreeWrapper(Object** p, uint16_t class_id);
 
   static uint32_t InfoHash(v8::RetainedObjectInfo* info) {
-    return ComputeIntegerHash(static_cast<uint32_t>(info->GetHash()));
+    return ComputeIntegerHash(static_cast<uint32_t>(info->GetHash()),
+                              v8::internal::kZeroHashSeed);
   }
   static bool RetainedInfosMatch(void* key1, void* key2) {
     return key1 == key2 ||
@@ -1125,7 +1128,8 @@ class HeapSnapshotJSONSerializer {
 
   INLINE(static uint32_t ObjectHash(const void* key)) {
     return ComputeIntegerHash(
-        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(key)));
+        static_cast<uint32_t>(reinterpret_cast<uintptr_t>(key)),
+        v8::internal::kZeroHashSeed);
   }
 
   void EnumerateNodes();
diff --git a/deps/v8/src/runtime-profiler.cc b/deps/v8/src/runtime-profiler.cc
index eaa6e1560..f89d98529 100644
--- a/deps/v8/src/runtime-profiler.cc
+++ b/deps/v8/src/runtime-profiler.cc
@@ -65,7 +65,7 @@ Atomic32 RuntimeProfiler::state_ = 0;
 Semaphore* RuntimeProfiler::semaphore_ = OS::CreateSemaphore(0);
 
 #ifdef DEBUG
-bool RuntimeProfiler::has_been_globally_setup_ = false;
+bool RuntimeProfiler::has_been_globally_set_up_ = false;
 #endif
 bool RuntimeProfiler::enabled_ = false;
 
@@ -82,10 +82,10 @@ RuntimeProfiler::RuntimeProfiler(Isolate* isolate)
 
 
 void RuntimeProfiler::GlobalSetup() {
-  ASSERT(!has_been_globally_setup_);
+  ASSERT(!has_been_globally_set_up_);
   enabled_ = V8::UseCrankshaft() && FLAG_opt;
 #ifdef DEBUG
-  has_been_globally_setup_ = true;
+  has_been_globally_set_up_ = true;
 #endif
 }
 
@@ -245,8 +245,8 @@ void RuntimeProfiler::NotifyTick() {
 }
 
 
-void RuntimeProfiler::Setup() {
-  ASSERT(has_been_globally_setup_);
+void RuntimeProfiler::SetUp() {
+  ASSERT(has_been_globally_set_up_);
   ClearSampleBuffer();
   // If the ticker hasn't already started, make sure to do so to get
   // the ticks for the runtime profiler.
diff --git a/deps/v8/src/runtime-profiler.h b/deps/v8/src/runtime-profiler.h
index 15c209713..d35b5df84 100644
--- a/deps/v8/src/runtime-profiler.h
+++ b/deps/v8/src/runtime-profiler.h
@@ -46,7 +46,7 @@ class RuntimeProfiler {
   static void GlobalSetup();
 
   static inline bool IsEnabled() {
-    ASSERT(has_been_globally_setup_);
+    ASSERT(has_been_globally_set_up_);
     return enabled_;
   }
 
@@ -54,7 +54,7 @@ class RuntimeProfiler {
 
   void NotifyTick();
 
-  void Setup();
+  void SetUp();
   void Reset();
   void TearDown();
 
@@ -126,7 +126,7 @@ class RuntimeProfiler {
   static Semaphore* semaphore_;
 
 #ifdef DEBUG
-  static bool has_been_globally_setup_;
+  static bool has_been_globally_set_up_;
 #endif
   static bool enabled_;
 };
diff --git a/deps/v8/src/runtime.cc b/deps/v8/src/runtime.cc
index 811d72d91..fb3621341 100644
--- a/deps/v8/src/runtime.cc
+++ b/deps/v8/src/runtime.cc
@@ -228,7 +228,7 @@ MUST_USE_RESULT static MaybeObject* DeepCopyBoilerplate(Isolate* isolate,
       break;
     }
     case DICTIONARY_ELEMENTS: {
-      NumberDictionary* element_dictionary = copy->element_dictionary();
+      SeededNumberDictionary* element_dictionary = copy->element_dictionary();
       int capacity = element_dictionary->Capacity();
       for (int i = 0; i < capacity; i++) {
         Object* k = element_dictionary->KeyAt(i);
@@ -355,7 +355,7 @@ static Handle<Object> CreateObjectLiteralBoilerplate(
   Handle<JSObject> boilerplate = isolate->factory()->NewJSObjectFromMap(map);
 
   // Normalize the elements of the boilerplate to save space if needed.
-  if (!should_have_fast_elements) NormalizeElements(boilerplate);
+  if (!should_have_fast_elements) JSObject::NormalizeElements(boilerplate);
 
   // Add the constant properties to the boilerplate.
   int length = constant_properties->length();
@@ -365,7 +365,8 @@ static Handle<Object> CreateObjectLiteralBoilerplate(
     // Normalize the properties of object to avoid n^2 behavior
     // when extending the object multiple properties. Indicate the number of
     // properties to be added.
-    NormalizeProperties(boilerplate, KEEP_INOBJECT_PROPERTIES, length / 2);
+    JSObject::NormalizeProperties(
+        boilerplate, KEEP_INOBJECT_PROPERTIES, length / 2);
   }
 
   for (int index = 0; index < length; index +=2) {
@@ -383,22 +384,18 @@ static Handle<Object> CreateObjectLiteralBoilerplate(
     if (key->IsSymbol()) {
       if (Handle<String>::cast(key)->AsArrayIndex(&element_index)) {
         // Array index as string (uint32).
-        result = SetOwnElement(boilerplate,
-                               element_index,
-                               value,
-                               kNonStrictMode);
+        result = JSObject::SetOwnElement(
+            boilerplate, element_index, value, kNonStrictMode);
       } else {
         Handle<String> name(String::cast(*key));
         ASSERT(!name->AsArrayIndex(&element_index));
-        result = SetLocalPropertyIgnoreAttributes(boilerplate, name,
-                                                  value, NONE);
+        result = JSObject::SetLocalPropertyIgnoreAttributes(
+            boilerplate, name, value, NONE);
       }
     } else if (key->ToArrayIndex(&element_index)) {
       // Array index (uint32).
-      result = SetOwnElement(boilerplate,
-                             element_index,
-                             value,
-                             kNonStrictMode);
+      result = JSObject::SetOwnElement(
+          boilerplate, element_index, value, kNonStrictMode);
     } else {
       // Non-uint32 number.
       ASSERT(key->IsNumber());
@@ -408,8 +405,8 @@ static Handle<Object> CreateObjectLiteralBoilerplate(
       const char* str = DoubleToCString(num, buffer);
       Handle<String> name =
           isolate->factory()->NewStringFromAscii(CStrVector(str));
-      result = SetLocalPropertyIgnoreAttributes(boilerplate, name,
-                                                value, NONE);
+      result = JSObject::SetLocalPropertyIgnoreAttributes(
+          boilerplate, name, value, NONE);
     }
     // If setting the property on the boilerplate throws an
     // exception, the exception is converted to an empty handle in
@@ -423,8 +420,8 @@ static Handle<Object> CreateObjectLiteralBoilerplate(
   // computed properties have been assigned so that we can generate
   // constant function properties.
   if (should_transform && !has_function_literal) {
-    TransformToFastProperties(boilerplate,
-                              boilerplate->map()->unused_property_fields());
+    JSObject::TransformToFastProperties(
+        boilerplate, boilerplate->map()->unused_property_fields());
   }
 
   return boilerplate;
@@ -434,7 +431,6 @@ static Handle<Object> CreateObjectLiteralBoilerplate(
 static const int kSmiOnlyLiteralMinimumLength = 1024;
 
 
-// static
 Handle<Object> Runtime::CreateArrayLiteralBoilerplate(
     Isolate* isolate,
     Handle<FixedArray> literals,
@@ -1048,26 +1044,26 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_GetOwnProperty) {
           holder = Handle<JSObject>(JSObject::cast(proto));
         }
         FixedArray* elements = FixedArray::cast(holder->elements());
-        NumberDictionary* dictionary = NULL;
+        SeededNumberDictionary* dictionary = NULL;
         if (elements->map() == heap->non_strict_arguments_elements_map()) {
-          dictionary = NumberDictionary::cast(elements->get(1));
+          dictionary = SeededNumberDictionary::cast(elements->get(1));
         } else {
-          dictionary = NumberDictionary::cast(elements);
+          dictionary = SeededNumberDictionary::cast(elements);
         }
         int entry = dictionary->FindEntry(index);
-        ASSERT(entry != NumberDictionary::kNotFound);
+        ASSERT(entry != SeededNumberDictionary::kNotFound);
         PropertyDetails details = dictionary->DetailsAt(entry);
         switch (details.type()) {
           case CALLBACKS: {
             // This is an accessor property with getter and/or setter.
-            FixedArray* callbacks =
-                FixedArray::cast(dictionary->ValueAt(entry));
+            AccessorPair* accessors =
+                AccessorPair::cast(dictionary->ValueAt(entry));
             elms->set(IS_ACCESSOR_INDEX, heap->true_value());
             if (CheckElementAccess(*obj, index, v8::ACCESS_GET)) {
-              elms->set(GETTER_INDEX, callbacks->get(0));
+              elms->set(GETTER_INDEX, accessors->getter());
             }
             if (CheckElementAccess(*obj, index, v8::ACCESS_SET)) {
-              elms->set(SETTER_INDEX, callbacks->get(1));
+              elms->set(SETTER_INDEX, accessors->setter());
             }
             break;
           }
@@ -1106,18 +1102,18 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_GetOwnProperty) {
   elms->set(CONFIGURABLE_INDEX, heap->ToBoolean(!result.IsDontDelete()));
 
   bool is_js_accessor = (result.type() == CALLBACKS) &&
-                        (result.GetCallbackObject()->IsFixedArray());
+                        (result.GetCallbackObject()->IsAccessorPair());
 
   if (is_js_accessor) {
     // __defineGetter__/__defineSetter__ callback.
     elms->set(IS_ACCESSOR_INDEX, heap->true_value());
 
-    FixedArray* structure = FixedArray::cast(result.GetCallbackObject());
+    AccessorPair* accessors = AccessorPair::cast(result.GetCallbackObject());
     if (CheckAccess(*obj, *name, &result, v8::ACCESS_GET)) {
-      elms->set(GETTER_INDEX, structure->get(0));
+      elms->set(GETTER_INDEX, accessors->getter());
     }
     if (CheckAccess(*obj, *name, &result, v8::ACCESS_SET)) {
-      elms->set(SETTER_INDEX, structure->get(1));
+      elms->set(SETTER_INDEX, accessors->setter());
     }
   } else {
     elms->set(IS_ACCESSOR_INDEX, heap->false_value());
@@ -1335,21 +1331,19 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareGlobals) {
       }
       PropertyAttributes attributes = static_cast<PropertyAttributes>(attr);
 
-      RETURN_IF_EMPTY_HANDLE(isolate,
-                             SetLocalPropertyIgnoreAttributes(global,
-                                                              name,
-                                                              value,
-                                                              attributes));
+      RETURN_IF_EMPTY_HANDLE(
+          isolate,
+          JSObject::SetLocalPropertyIgnoreAttributes(global, name, value,
+                                                     attributes));
     } else {
       LanguageMode language_mode = DeclareGlobalsLanguageMode::decode(flags);
       StrictModeFlag strict_mode_flag = (language_mode == CLASSIC_MODE)
           ? kNonStrictMode : kStrictMode;
-      RETURN_IF_EMPTY_HANDLE(isolate,
-                             SetProperty(global,
-                                         name,
-                                         value,
-                                         static_cast<PropertyAttributes>(attr),
-                                         strict_mode_flag));
+      RETURN_IF_EMPTY_HANDLE(
+          isolate,
+          JSReceiver::SetProperty(global, name, value,
+                                  static_cast<PropertyAttributes>(attr),
+                                  strict_mode_flag));
     }
   }
 
@@ -1403,7 +1397,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareContextSlot) {
         Handle<JSObject> object = Handle<JSObject>::cast(holder);
         RETURN_IF_EMPTY_HANDLE(
             isolate,
-            SetProperty(object, name, initial_value, mode, kNonStrictMode));
+            JSReceiver::SetProperty(object, name, initial_value, mode,
+                                    kNonStrictMode));
       }
     }
 
@@ -1443,9 +1438,9 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DeclareContextSlot) {
         return ThrowRedeclarationError(isolate, "const", name);
       }
     }
-    RETURN_IF_EMPTY_HANDLE(isolate,
-                           SetProperty(object, name, value, mode,
-                                       kNonStrictMode));
+    RETURN_IF_EMPTY_HANDLE(
+        isolate,
+        JSReceiver::SetProperty(object, name, value, mode, kNonStrictMode));
   }
 
   return isolate->heap()->undefined_value();
@@ -1554,12 +1549,10 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstGlobal) {
     // property through an interceptor and only do it if it's
     // uninitialized, e.g. the hole. Nirk...
     // Passing non-strict mode because the property is writable.
-    RETURN_IF_EMPTY_HANDLE(isolate,
-                           SetProperty(global,
-                                       name,
-                                       value,
-                                       attributes,
-                                       kNonStrictMode));
+    RETURN_IF_EMPTY_HANDLE(
+        isolate,
+        JSReceiver::SetProperty(global, name, value, attributes,
+                                kNonStrictMode));
     return *value;
   }
 
@@ -1629,7 +1622,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstContextSlot) {
     // Strict mode not needed (const disallowed in strict mode).
     RETURN_IF_EMPTY_HANDLE(
         isolate,
-        SetProperty(global, name, value, NONE, kNonStrictMode));
+        JSReceiver::SetProperty(global, name, value, NONE, kNonStrictMode));
     return *value;
   }
 
@@ -1681,7 +1674,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_InitializeConstContextSlot) {
       // Strict mode not needed (const disallowed in strict mode).
       RETURN_IF_EMPTY_HANDLE(
           isolate,
-          SetProperty(object, name, value, attributes, kNonStrictMode));
+          JSReceiver::SetProperty(object, name, value, attributes,
+                                  kNonStrictMode));
     }
   }
 
@@ -1696,7 +1690,7 @@ RUNTIME_FUNCTION(MaybeObject*,
   CONVERT_ARG_CHECKED(JSObject, object, 0);
   CONVERT_SMI_ARG_CHECKED(properties, 1);
   if (object->HasFastProperties()) {
-    NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, properties);
+    JSObject::NormalizeProperties(object, KEEP_INOBJECT_PROPERTIES, properties);
   }
   return *object;
 }
@@ -1852,7 +1846,7 @@ static Handle<JSFunction> InstallBuiltin(Isolate* isolate,
                                       code,
                                       false);
   optimized->shared()->DontAdaptArguments();
-  SetProperty(holder, key, optimized, NONE, kStrictMode);
+  JSReceiver::SetProperty(holder, key, optimized, NONE, kStrictMode);
   return optimized;
 }
 
@@ -4066,8 +4060,7 @@ MaybeObject* Runtime::GetElementOrCharAt(Isolate* isolate,
   }
 
   if (object->IsString() || object->IsNumber() || object->IsBoolean()) {
-    Handle<Object> prototype = GetPrototype(object);
-    return prototype->GetElement(index);
+    return object->GetPrototype()->GetElement(index);
   }
 
   return object->GetElement(index);
@@ -4134,8 +4127,8 @@ MaybeObject* TransitionElements(Handle<Object> object,
   ElementsKind from_kind =
       Handle<JSObject>::cast(object)->map()->elements_kind();
   if (Map::IsValidElementsTransition(from_kind, to_kind)) {
-    Handle<Object> result =
-        TransitionElementsKind(Handle<JSObject>::cast(object), to_kind);
+    Handle<Object> result = JSObject::TransitionElementsKind(
+        Handle<JSObject>::cast(object), to_kind);
     if (result.is_null()) return isolate->ThrowIllegalOperation();
     return *result;
   }
@@ -4307,12 +4300,13 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DefineOrRedefineDataProperty) {
       return isolate->Throw(*error);
     }
 
-    Handle<NumberDictionary> dictionary = NormalizeElements(js_object);
+    Handle<SeededNumberDictionary> dictionary =
+        JSObject::NormalizeElements(js_object);
     // Make sure that we never go back to fast case.
     dictionary->set_requires_slow_elements();
     PropertyDetails details = PropertyDetails(attr, NORMAL);
-    Handle<NumberDictionary> extended_dictionary =
-        NumberDictionarySet(dictionary, index, obj_value, details);
+    Handle<SeededNumberDictionary> extended_dictionary =
+        SeededNumberDictionary::Set(dictionary, index, obj_value, details);
     if (*extended_dictionary != *dictionary) {
       if (js_object->GetElementsKind() == NON_STRICT_ARGUMENTS_ELEMENTS) {
         FixedArray::cast(js_object->elements())->set(1, *extended_dictionary);
@@ -4362,7 +4356,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DefineOrRedefineDataProperty) {
       // we don't have to check for null.
       js_object = Handle<JSObject>(JSObject::cast(js_object->GetPrototype()));
     }
-    NormalizeProperties(js_object, CLEAR_INOBJECT_PROPERTIES, 0);
+    JSObject::NormalizeProperties(js_object, CLEAR_INOBJECT_PROPERTIES, 0);
     // Use IgnoreAttributes version since a readonly property may be
     // overridden and SetProperty does not allow this.
     return js_object->SetLocalPropertyIgnoreAttributes(*name,
@@ -4387,12 +4381,13 @@ static MaybeObject* NormalizeObjectSetElement(Isolate* isolate,
                                               Handle<Object> value,
                                               PropertyAttributes attr) {
   // Normalize the elements to enable attributes on the property.
-  Handle<NumberDictionary> dictionary = NormalizeElements(js_object);
+  Handle<SeededNumberDictionary> dictionary =
+      JSObject::NormalizeElements(js_object);
   // Make sure that we never go back to fast case.
   dictionary->set_requires_slow_elements();
   PropertyDetails details = PropertyDetails(attr, NORMAL);
-  Handle<NumberDictionary> extended_dictionary =
-      NumberDictionarySet(dictionary, index, value, details);
+  Handle<SeededNumberDictionary> extended_dictionary =
+      SeededNumberDictionary::Set(dictionary, index, value, details);
   if (*extended_dictionary != *dictionary) {
     js_object->set_elements(*extended_dictionary);
   }
@@ -4447,7 +4442,8 @@ MaybeObject* Runtime::SetObjectProperty(Isolate* isolate,
       return NormalizeObjectSetElement(isolate, js_object, index, value, attr);
     }
 
-    Handle<Object> result = SetElement(js_object, index, value, strict_mode);
+    Handle<Object> result =
+        JSObject::SetElement(js_object, index, value, strict_mode);
     if (result.is_null()) return Failure::Exception();
     return *value;
   }
@@ -4462,11 +4458,13 @@ MaybeObject* Runtime::SetObjectProperty(Isolate* isolate,
                                          value,
                                          attr);
       }
-      result = SetElement(js_object, index, value, strict_mode);
+      result =
+          JSObject::SetElement(js_object, index, value, strict_mode);
     } else {
       Handle<String> key_string = Handle<String>::cast(key);
       key_string->TryFlatten();
-      result = SetProperty(js_object, key_string, value, attr, strict_mode);
+      result = JSReceiver::SetProperty(
+          js_object, key_string, value, attr, strict_mode);
     }
     if (result.is_null()) return Failure::Exception();
     return *value;
@@ -4655,8 +4653,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StoreArrayLiteralElement) {
 
   if (value->IsNumber()) {
     ASSERT(elements_kind == FAST_SMI_ONLY_ELEMENTS);
-    TransitionElementsKind(object, FAST_DOUBLE_ELEMENTS);
-    TransitionElementsKind(boilerplate_object, FAST_DOUBLE_ELEMENTS);
+    JSObject::TransitionElementsKind(object, FAST_DOUBLE_ELEMENTS);
+    JSObject::TransitionElementsKind(boilerplate_object, FAST_DOUBLE_ELEMENTS);
     ASSERT(object->GetElementsKind() == FAST_DOUBLE_ELEMENTS);
     FixedDoubleArray* double_array =
         FixedDoubleArray::cast(object->elements());
@@ -4665,8 +4663,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StoreArrayLiteralElement) {
   } else {
     ASSERT(elements_kind == FAST_SMI_ONLY_ELEMENTS ||
            elements_kind == FAST_DOUBLE_ELEMENTS);
-    TransitionElementsKind(object, FAST_ELEMENTS);
-    TransitionElementsKind(boilerplate_object, FAST_ELEMENTS);
+    JSObject::TransitionElementsKind(object, FAST_ELEMENTS);
+    JSObject::TransitionElementsKind(boilerplate_object, FAST_ELEMENTS);
     FixedArray* object_array =
         FixedArray::cast(object->elements());
     object_array->set(store_index, *value);
@@ -4818,15 +4816,15 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_IsPropertyEnumerable) {
           object = JSObject::cast(proto);
         }
         FixedArray* elements = FixedArray::cast(object->elements());
-        NumberDictionary* dictionary = NULL;
+        SeededNumberDictionary* dictionary = NULL;
         if (elements->map() ==
             isolate->heap()->non_strict_arguments_elements_map()) {
-          dictionary = NumberDictionary::cast(elements->get(1));
+          dictionary = SeededNumberDictionary::cast(elements->get(1));
         } else {
-          dictionary = NumberDictionary::cast(elements);
+          dictionary = SeededNumberDictionary::cast(elements);
         }
         int entry = dictionary->FindEntry(index);
-        ASSERT(entry != NumberDictionary::kNotFound);
+        ASSERT(entry != SeededNumberDictionary::kNotFound);
         PropertyDetails details = dictionary->DetailsAt(entry);
         return isolate->heap()->ToBoolean(!details.IsDontEnum());
       }
@@ -5144,31 +5142,20 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_GetArgumentsProperty) {
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_ToFastProperties) {
-  HandleScope scope(isolate);
-
   ASSERT(args.length() == 1);
-  Handle<Object> object = args.at<Object>(0);
-  if (object->IsJSObject()) {
-    Handle<JSObject> js_object = Handle<JSObject>::cast(object);
-    if (!js_object->HasFastProperties() && !js_object->IsGlobalObject()) {
-      MaybeObject* ok = js_object->TransformToFastProperties(0);
-      if (ok->IsRetryAfterGC()) return ok;
-    }
-  }
-  return *object;
+  Object* object = args[0];
+  return (object->IsJSObject() && !object->IsGlobalObject())
+      ? JSObject::cast(object)->TransformToFastProperties(0)
+      : object;
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_ToSlowProperties) {
-  HandleScope scope(isolate);
-
   ASSERT(args.length() == 1);
-  Handle<Object> object = args.at<Object>(0);
-  if (object->IsJSObject() && !object->IsJSGlobalProxy()) {
-    Handle<JSObject> js_object = Handle<JSObject>::cast(object);
-    NormalizeProperties(js_object, CLEAR_INOBJECT_PROPERTIES, 0);
-  }
-  return *object;
+  Object* obj = args[0];
+  return (obj->IsJSObject() && !obj->IsJSGlobalProxy())
+      ? JSObject::cast(obj)->NormalizeProperties(CLEAR_INOBJECT_PROPERTIES, 0)
+      : obj;
 }
 
 
@@ -9133,7 +9120,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_StoreContextSlot) {
       (object->GetLocalPropertyAttribute(*name) == ABSENT)) {
     RETURN_IF_EMPTY_HANDLE(
         isolate,
-        SetProperty(object, name, value, NONE, strict_mode));
+        JSReceiver::SetProperty(object, name, value, NONE, strict_mode));
   } else if (strict_mode == kStrictMode && (attributes & READ_ONLY) != 0) {
     // Setting read only property in strict mode.
     Handle<Object> error =
@@ -9386,20 +9373,18 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_ParseJson) {
 
 bool CodeGenerationFromStringsAllowed(Isolate* isolate,
                                       Handle<Context> context) {
-  if (context->allow_code_gen_from_strings()->IsFalse()) {
-    // Check with callback if set.
-    AllowCodeGenerationFromStringsCallback callback =
-        isolate->allow_code_gen_callback();
-    if (callback == NULL) {
-      // No callback set and code generation disallowed.
-      return false;
-    } else {
-      // Callback set. Let it decide if code generation is allowed.
-      VMState state(isolate, EXTERNAL);
-      return callback(v8::Utils::ToLocal(context));
-    }
+  ASSERT(context->allow_code_gen_from_strings()->IsFalse());
+  // Check with callback if set.
+  AllowCodeGenerationFromStringsCallback callback =
+      isolate->allow_code_gen_callback();
+  if (callback == NULL) {
+    // No callback set and code generation disallowed.
+    return false;
+  } else {
+    // Callback set. Let it decide if code generation is allowed.
+    VMState state(isolate, EXTERNAL);
+    return callback(v8::Utils::ToLocal(context));
   }
-  return true;
 }
 
 
@@ -9413,7 +9398,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_CompileString) {
 
   // Check if global context allows code generation from
   // strings. Throw an exception if it doesn't.
-  if (!CodeGenerationFromStringsAllowed(isolate, context)) {
+  if (context->allow_code_gen_from_strings()->IsFalse() &&
+      !CodeGenerationFromStringsAllowed(isolate, context)) {
     return isolate->Throw(*isolate->factory()->NewError(
         "code_gen_from_strings", HandleVector<Object>(NULL, 0)));
   }
@@ -9440,7 +9426,8 @@ static ObjectPair CompileGlobalEval(Isolate* isolate,
 
   // Check if global context allows code generation from
   // strings. Throw an exception if it doesn't.
-  if (!CodeGenerationFromStringsAllowed(isolate, global_context)) {
+  if (global_context->allow_code_gen_from_strings()->IsFalse() &&
+      !CodeGenerationFromStringsAllowed(isolate, global_context)) {
     isolate->Throw(*isolate->factory()->NewError(
         "code_gen_from_strings", HandleVector<Object>(NULL, 0)));
     return MakePair(Failure::Exception(), NULL);
@@ -9596,8 +9583,9 @@ class ArrayConcatVisitor {
       // Fall-through to dictionary mode.
     }
     ASSERT(!fast_elements_);
-    Handle<NumberDictionary> dict(NumberDictionary::cast(*storage_));
-    Handle<NumberDictionary> result =
+    Handle<SeededNumberDictionary> dict(
+        SeededNumberDictionary::cast(*storage_));
+    Handle<SeededNumberDictionary> result =
         isolate_->factory()->DictionaryAtNumberPut(dict, index, elm);
     if (!result.is_identical_to(dict)) {
       // Dictionary needed to grow.
@@ -9637,14 +9625,15 @@ class ArrayConcatVisitor {
   void SetDictionaryMode(uint32_t index) {
     ASSERT(fast_elements_);
     Handle<FixedArray> current_storage(*storage_);
-    Handle<NumberDictionary> slow_storage(
-        isolate_->factory()->NewNumberDictionary(current_storage->length()));
+    Handle<SeededNumberDictionary> slow_storage(
+        isolate_->factory()->NewSeededNumberDictionary(
+            current_storage->length()));
     uint32_t current_length = static_cast<uint32_t>(current_storage->length());
     for (uint32_t i = 0; i < current_length; i++) {
       HandleScope loop_scope;
       Handle<Object> element(current_storage->get(i));
       if (!element->IsTheHole()) {
-        Handle<NumberDictionary> new_storage =
+        Handle<SeededNumberDictionary> new_storage =
           isolate_->factory()->DictionaryAtNumberPut(slow_storage, i, element);
         if (!new_storage.is_identical_to(slow_storage)) {
           slow_storage = loop_scope.CloseAndEscape(new_storage);
@@ -9696,8 +9685,8 @@ static uint32_t EstimateElementCount(Handle<JSArray> array) {
       UNREACHABLE();
       break;
     case DICTIONARY_ELEMENTS: {
-      Handle<NumberDictionary> dictionary(
-          NumberDictionary::cast(array->elements()));
+      Handle<SeededNumberDictionary> dictionary(
+          SeededNumberDictionary::cast(array->elements()));
       int capacity = dictionary->Capacity();
       for (int i = 0; i < capacity; i++) {
         Handle<Object> key(dictionary->KeyAt(i));
@@ -9800,7 +9789,8 @@ static void CollectElementIndices(Handle<JSObject> object,
       break;
     }
     case DICTIONARY_ELEMENTS: {
-      Handle<NumberDictionary> dict(NumberDictionary::cast(object->elements()));
+      Handle<SeededNumberDictionary> dict(
+          SeededNumberDictionary::cast(object->elements()));
       uint32_t capacity = dict->Capacity();
       for (uint32_t j = 0; j < capacity; j++) {
         HandleScope loop_scope;
@@ -9935,7 +9925,7 @@ static bool IterateElements(Isolate* isolate,
       break;
     }
     case DICTIONARY_ELEMENTS: {
-      Handle<NumberDictionary> dict(receiver->element_dictionary());
+      Handle<SeededNumberDictionary> dict(receiver->element_dictionary());
       List<uint32_t> indices(dict->Capacity() / 2);
       // Collect all indices in the object and the prototypes less
       // than length. This might introduce duplicates in the indices list.
@@ -10049,7 +10039,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_ArrayConcat) {
         // FAST_ELEMENTS.
         if (array->HasFastDoubleElements()) {
           array = Handle<JSArray>::cast(
-              TransitionElementsKind(array, FAST_ELEMENTS));
+              JSObject::TransitionElementsKind(array, FAST_ELEMENTS));
         }
         length_estimate =
             static_cast<uint32_t>(array->length()->Number());
@@ -10091,7 +10081,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_ArrayConcat) {
     uint32_t at_least_space_for = estimate_nof_elements +
                                   (estimate_nof_elements >> 2);
     storage = Handle<FixedArray>::cast(
-        isolate->factory()->NewNumberDictionary(at_least_space_for));
+        isolate->factory()->NewSeededNumberDictionary(at_least_space_for));
   }
 
   ArrayConcatVisitor visitor(isolate, storage, fast_case);
@@ -10179,7 +10169,8 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_EstimateNumberOfElements) {
   CONVERT_CHECKED(JSObject, object, args[0]);
   HeapObject* elements = object->elements();
   if (elements->IsDictionary()) {
-    return Smi::FromInt(NumberDictionary::cast(elements)->NumberOfElements());
+    int result = SeededNumberDictionary::cast(elements)->NumberOfElements();
+    return Smi::FromInt(result);
   } else if (object->IsJSArray()) {
     return JSArray::cast(object)->length();
   } else {
@@ -10209,10 +10200,10 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_SwapElements) {
   Handle<Object> tmp2 = Object::GetElement(jsobject, index2);
   RETURN_IF_EMPTY_HANDLE(isolate, tmp2);
 
-  RETURN_IF_EMPTY_HANDLE(isolate,
-                         SetElement(jsobject, index1, tmp2, kStrictMode));
-  RETURN_IF_EMPTY_HANDLE(isolate,
-                         SetElement(jsobject, index2, tmp1, kStrictMode));
+  RETURN_IF_EMPTY_HANDLE(
+      isolate, JSObject::SetElement(jsobject, index1, tmp2, kStrictMode));
+  RETURN_IF_EMPTY_HANDLE(
+      isolate, JSObject::SetElement(jsobject, index2, tmp1, kStrictMode));
 
   return isolate->heap()->undefined_value();
 }
@@ -10488,15 +10479,15 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DebugGetPropertyDetails) {
       // If the callback object is a fixed array then it contains JavaScript
       // getter and/or setter.
       bool hasJavaScriptAccessors = result_type == CALLBACKS &&
-                                    result_callback_obj->IsFixedArray();
+                                    result_callback_obj->IsAccessorPair();
       Handle<FixedArray> details =
           isolate->factory()->NewFixedArray(hasJavaScriptAccessors ? 5 : 2);
       details->set(0, *value);
       details->set(1, property_details);
       if (hasJavaScriptAccessors) {
         details->set(2, isolate->heap()->ToBoolean(caught_exception));
-        details->set(3, FixedArray::cast(*result_callback_obj)->get(0));
-        details->set(4, FixedArray::cast(*result_callback_obj)->get(1));
+        details->set(3, AccessorPair::cast(*result_callback_obj)->getter());
+        details->set(4, AccessorPair::cast(*result_callback_obj)->setter());
       }
 
       return *isolate->factory()->NewJSArrayWithElements(details);
diff --git a/deps/v8/src/scopes.cc b/deps/v8/src/scopes.cc
index 4a6d0a7fa..d0ee8ec7f 100644
--- a/deps/v8/src/scopes.cc
+++ b/deps/v8/src/scopes.cc
@@ -808,7 +808,7 @@ void Scope::Print(int n) {
     PrintF(")");
   }
 
-  PrintF(" {\n");
+  PrintF(" { // (%d, %d)\n", start_position(), end_position());
 
   // Function name, if any (named function literals, only).
   if (function_ != NULL) {
diff --git a/deps/v8/src/spaces.cc b/deps/v8/src/spaces.cc
index ebd3e6519..c8e94ddbe 100644
--- a/deps/v8/src/spaces.cc
+++ b/deps/v8/src/spaces.cc
@@ -132,7 +132,7 @@ CodeRange::CodeRange(Isolate* isolate)
 }
 
 
-bool CodeRange::Setup(const size_t requested) {
+bool CodeRange::SetUp(const size_t requested) {
   ASSERT(code_range_ == NULL);
 
   code_range_ = new VirtualMemory(requested);
@@ -268,7 +268,7 @@ MemoryAllocator::MemoryAllocator(Isolate* isolate)
 }
 
 
-bool MemoryAllocator::Setup(intptr_t capacity, intptr_t capacity_executable) {
+bool MemoryAllocator::SetUp(intptr_t capacity, intptr_t capacity_executable) {
   capacity_ = RoundUp(capacity, Page::kPageSize);
   capacity_executable_ = RoundUp(capacity_executable, Page::kPageSize);
   ASSERT_GE(capacity_, capacity_executable_);
@@ -658,7 +658,8 @@ PagedSpace::PagedSpace(Heap* heap,
     : Space(heap, id, executable),
       free_list_(this),
       was_swept_conservatively_(false),
-      first_unswept_page_(Page::FromAddress(NULL)) {
+      first_unswept_page_(Page::FromAddress(NULL)),
+      unswept_free_bytes_(0) {
   max_capacity_ = (RoundDown(max_capacity, Page::kPageSize) / Page::kPageSize)
                   * Page::kObjectAreaSize;
   accounting_stats_.Clear();
@@ -670,12 +671,12 @@ PagedSpace::PagedSpace(Heap* heap,
 }
 
 
-bool PagedSpace::Setup() {
+bool PagedSpace::SetUp() {
   return true;
 }
 
 
-bool PagedSpace::HasBeenSetup() {
+bool PagedSpace::HasBeenSetUp() {
   return true;
 }
 
@@ -873,9 +874,9 @@ void PagedSpace::Verify(ObjectVisitor* visitor) {
 // NewSpace implementation
 
 
-bool NewSpace::Setup(int reserved_semispace_capacity,
+bool NewSpace::SetUp(int reserved_semispace_capacity,
                      int maximum_semispace_capacity) {
-  // Setup new space based on the preallocated memory block defined by
+  // Set up new space based on the preallocated memory block defined by
   // start and size. The provided space is divided into two semi-spaces.
   // To support fast containment testing in the new space, the size of
   // this chunk must be a power of two and it must be aligned to its size.
@@ -894,7 +895,7 @@ bool NewSpace::Setup(int reserved_semispace_capacity,
   ASSERT(initial_semispace_capacity <= maximum_semispace_capacity);
   ASSERT(IsPowerOf2(maximum_semispace_capacity));
 
-  // Allocate and setup the histogram arrays if necessary.
+  // Allocate and set up the histogram arrays if necessary.
   allocated_histogram_ = NewArray<HistogramInfo>(LAST_TYPE + 1);
   promoted_histogram_ = NewArray<HistogramInfo>(LAST_TYPE + 1);
 
@@ -908,12 +909,12 @@ bool NewSpace::Setup(int reserved_semispace_capacity,
          2 * heap()->ReservedSemiSpaceSize());
   ASSERT(IsAddressAligned(chunk_base_, 2 * reserved_semispace_capacity, 0));
 
-  if (!to_space_.Setup(chunk_base_,
+  if (!to_space_.SetUp(chunk_base_,
                        initial_semispace_capacity,
                        maximum_semispace_capacity)) {
     return false;
   }
-  if (!from_space_.Setup(chunk_base_ + reserved_semispace_capacity,
+  if (!from_space_.SetUp(chunk_base_ + reserved_semispace_capacity,
                          initial_semispace_capacity,
                          maximum_semispace_capacity)) {
     return false;
@@ -1148,7 +1149,7 @@ void NewSpace::Verify() {
 // -----------------------------------------------------------------------------
 // SemiSpace implementation
 
-bool SemiSpace::Setup(Address start,
+bool SemiSpace::SetUp(Address start,
                       int initial_capacity,
                       int maximum_capacity) {
   // Creates a space in the young generation. The constructor does not
@@ -2062,6 +2063,7 @@ void PagedSpace::PrepareForMarkCompact() {
     } while (p != anchor());
   }
   first_unswept_page_ = Page::FromAddress(NULL);
+  unswept_free_bytes_ = 0;
 
   // Clear the free list before a full GC---it will be rebuilt afterward.
   free_list_.Reset();
@@ -2110,6 +2112,7 @@ bool PagedSpace::AdvanceSweeper(intptr_t bytes_to_sweep) {
         PrintF("Sweeping 0x%" V8PRIxPTR " lazily advanced.\n",
                reinterpret_cast<intptr_t>(p));
       }
+      unswept_free_bytes_ -= (Page::kObjectAreaSize - p->LiveBytes());
       freed_bytes += MarkCompactCollector::SweepConservatively(this, p);
     }
     p = next_page;
@@ -2408,7 +2411,7 @@ LargeObjectSpace::LargeObjectSpace(Heap* heap,
       objects_size_(0) {}
 
 
-bool LargeObjectSpace::Setup() {
+bool LargeObjectSpace::SetUp() {
   first_page_ = NULL;
   size_ = 0;
   page_count_ = 0;
@@ -2428,7 +2431,7 @@ void LargeObjectSpace::TearDown() {
         space, kAllocationActionFree, page->size());
     heap()->isolate()->memory_allocator()->Free(page);
   }
-  Setup();
+  SetUp();
 }
 
 
diff --git a/deps/v8/src/spaces.h b/deps/v8/src/spaces.h
index 41bfec90f..41c3ef929 100644
--- a/deps/v8/src/spaces.h
+++ b/deps/v8/src/spaces.h
@@ -815,7 +815,7 @@ class CodeRange {
   // Reserves a range of virtual memory, but does not commit any of it.
   // Can only be called once, at heap initialization time.
   // Returns false on failure.
-  bool Setup(const size_t requested_size);
+  bool SetUp(const size_t requested_size);
 
   // Frees the range of virtual memory, and frees the data structures used to
   // manage it.
@@ -943,7 +943,7 @@ class MemoryAllocator {
 
   // Initializes its internal bookkeeping structures.
   // Max capacity of the total space and executable memory limit.
-  bool Setup(intptr_t max_capacity, intptr_t capacity_executable);
+  bool SetUp(intptr_t max_capacity, intptr_t capacity_executable);
 
   void TearDown();
 
@@ -1419,11 +1419,11 @@ class PagedSpace : public Space {
   // the memory allocator's initial chunk) if possible.  If the block of
   // addresses is not big enough to contain a single page-aligned page, a
   // fresh chunk will be allocated.
-  bool Setup();
+  bool SetUp();
 
   // Returns true if the space has been successfully set up and not
   // subsequently torn down.
-  bool HasBeenSetup();
+  bool HasBeenSetUp();
 
   // Cleans up the space, frees all pages in this space except those belonging
   // to the initial chunk, uncommits addresses in the initial chunk.
@@ -1469,9 +1469,12 @@ class PagedSpace : public Space {
   // linear allocation area (between top and limit) are also counted here.
   virtual intptr_t Size() { return accounting_stats_.Size(); }
 
-  // As size, but the bytes in the current linear allocation area are not
-  // included.
-  virtual intptr_t SizeOfObjects() { return Size() - (limit() - top()); }
+  // As size, but the bytes in lazily swept pages are estimated and the bytes
+  // in the current linear allocation area are not included.
+  virtual intptr_t SizeOfObjects() {
+    ASSERT(!IsSweepingComplete() || (unswept_free_bytes_ == 0));
+    return Size() - unswept_free_bytes_ - (limit() - top());
+  }
 
   // Wasted bytes in this space.  These are just the bytes that were thrown away
   // due to being too small to use for allocation.  They do not include the
@@ -1479,9 +1482,7 @@ class PagedSpace : public Space {
   virtual intptr_t Waste() { return accounting_stats_.Waste(); }
 
   // Returns the allocation pointer in this space.
-  Address top() {
-    return allocation_info_.top;
-  }
+  Address top() { return allocation_info_.top; }
   Address limit() { return allocation_info_.limit; }
 
   // Allocate the requested number of bytes in the space if possible, return a
@@ -1557,10 +1558,15 @@ class PagedSpace : public Space {
   }
 
   void SetPagesToSweep(Page* first) {
+    ASSERT(unswept_free_bytes_ == 0);
     if (first == &anchor_) first = NULL;
     first_unswept_page_ = first;
   }
 
+  void MarkPageForLazySweeping(Page* p) {
+    unswept_free_bytes_ += (Page::kObjectAreaSize - p->LiveBytes());
+  }
+
   bool AdvanceSweeper(intptr_t bytes_to_sweep);
 
   bool IsSweepingComplete() {
@@ -1647,8 +1653,15 @@ class PagedSpace : public Space {
 
   bool was_swept_conservatively_;
 
+  // The first page to be swept when the lazy sweeper advances. Is set
+  // to NULL when all pages have been swept.
   Page* first_unswept_page_;
 
+  // The number of free bytes which could be reclaimed by advancing the
+  // lazy sweeper.  This is only an estimation because lazy sweeping is
+  // done conservatively.
+  intptr_t unswept_free_bytes_;
+
   // Expands the space by allocating a fixed number of pages. Returns false if
   // it cannot allocate requested number of pages from OS, or if the hard heap
   // size limit has been hit.
@@ -1808,14 +1821,14 @@ class SemiSpace : public Space {
       current_page_(NULL) { }
 
   // Sets up the semispace using the given chunk.
-  bool Setup(Address start, int initial_capacity, int maximum_capacity);
+  bool SetUp(Address start, int initial_capacity, int maximum_capacity);
 
   // Tear down the space.  Heap memory was not allocated by the space, so it
   // is not deallocated here.
   void TearDown();
 
   // True if the space has been set up but not torn down.
-  bool HasBeenSetup() { return start_ != NULL; }
+  bool HasBeenSetUp() { return start_ != NULL; }
 
   // Grow the semispace to the new capacity.  The new capacity
   // requested must be larger than the current capacity and less than
@@ -2054,15 +2067,15 @@ class NewSpace : public Space {
       inline_allocation_limit_step_(0) {}
 
   // Sets up the new space using the given chunk.
-  bool Setup(int reserved_semispace_size_, int max_semispace_size);
+  bool SetUp(int reserved_semispace_size_, int max_semispace_size);
 
   // Tears down the space.  Heap memory was not allocated by the space, so it
   // is not deallocated here.
   void TearDown();
 
   // True if the space has been set up but not torn down.
-  bool HasBeenSetup() {
-    return to_space_.HasBeenSetup() && from_space_.HasBeenSetup();
+  bool HasBeenSetUp() {
+    return to_space_.HasBeenSetUp() && from_space_.HasBeenSetUp();
   }
 
   // Flip the pair of spaces.
@@ -2461,7 +2474,7 @@ class LargeObjectSpace : public Space {
   virtual ~LargeObjectSpace() {}
 
   // Initializes internal data structures.
-  bool Setup();
+  bool SetUp();
 
   // Releases internal resources, frees objects in this space.
   void TearDown();
diff --git a/deps/v8/src/store-buffer.cc b/deps/v8/src/store-buffer.cc
index 0f1fed028..9022b3be8 100644
--- a/deps/v8/src/store-buffer.cc
+++ b/deps/v8/src/store-buffer.cc
@@ -55,7 +55,7 @@ StoreBuffer::StoreBuffer(Heap* heap)
 }
 
 
-void StoreBuffer::Setup() {
+void StoreBuffer::SetUp() {
   virtual_memory_ = new VirtualMemory(kStoreBufferSize * 3);
   uintptr_t start_as_int =
       reinterpret_cast<uintptr_t>(virtual_memory_->address());
diff --git a/deps/v8/src/store-buffer.h b/deps/v8/src/store-buffer.h
index 204fa3ff4..951a9ca2b 100644
--- a/deps/v8/src/store-buffer.h
+++ b/deps/v8/src/store-buffer.h
@@ -54,7 +54,7 @@ class StoreBuffer {
 
   inline Address TopAddress();
 
-  void Setup();
+  void SetUp();
   void TearDown();
 
   // This is used by the mutator to enter addresses into the store buffer.
diff --git a/deps/v8/src/stub-cache.cc b/deps/v8/src/stub-cache.cc
index 787e833f4..ec8f6bdf2 100644
--- a/deps/v8/src/stub-cache.cc
+++ b/deps/v8/src/stub-cache.cc
@@ -678,11 +678,10 @@ Handle<Code> StubCache::ComputeCallGlobal(int argc,
 
 
 static void FillCache(Isolate* isolate, Handle<Code> code) {
-  Handle<NumberDictionary> dictionary =
-      NumberDictionarySet(isolate->factory()->non_monomorphic_cache(),
-                          code->flags(),
-                          code,
-                          PropertyDetails(NONE, NORMAL));
+  Handle<UnseededNumberDictionary> dictionary =
+      UnseededNumberDictionary::Set(isolate->factory()->non_monomorphic_cache(),
+                                    code->flags(),
+                                    code);
   isolate->heap()->public_set_non_monomorphic_cache(*dictionary);
 }
 
@@ -697,7 +696,7 @@ Code* StubCache::FindCallInitialize(int argc,
       Code::ComputeFlags(kind, UNINITIALIZED, extra_state, NORMAL, argc);
 
   // Use raw_unchecked... so we don't get assert failures during GC.
-  NumberDictionary* dictionary =
+  UnseededNumberDictionary* dictionary =
       isolate()->heap()->raw_unchecked_non_monomorphic_cache();
   int entry = dictionary->FindEntry(isolate(), flags);
   ASSERT(entry != -1);
@@ -716,7 +715,8 @@ Handle<Code> StubCache::ComputeCallInitialize(int argc,
       CallICBase::Contextual::encode(mode == RelocInfo::CODE_TARGET_CONTEXT);
   Code::Flags flags =
       Code::ComputeFlags(kind, UNINITIALIZED, extra_state, NORMAL, argc);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
@@ -744,7 +744,8 @@ Handle<Code> StubCache::ComputeCallPreMonomorphic(
     Code::ExtraICState extra_state) {
   Code::Flags flags =
       Code::ComputeFlags(kind, PREMONOMORPHIC, extra_state, NORMAL, argc);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
@@ -760,7 +761,8 @@ Handle<Code> StubCache::ComputeCallNormal(int argc,
                                           Code::ExtraICState extra_state) {
   Code::Flags flags =
       Code::ComputeFlags(kind, MONOMORPHIC, extra_state, NORMAL, argc);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
@@ -776,7 +778,8 @@ Handle<Code> StubCache::ComputeCallArguments(int argc, Code::Kind kind) {
   Code::Flags flags =
       Code::ComputeFlags(kind, MEGAMORPHIC, Code::kNoExtraICState,
                          NORMAL, argc);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
@@ -794,7 +797,8 @@ Handle<Code> StubCache::ComputeCallMegamorphic(
   Code::Flags flags =
       Code::ComputeFlags(kind, MEGAMORPHIC, extra_state,
                          NORMAL, argc);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
@@ -813,7 +817,8 @@ Handle<Code> StubCache::ComputeCallMiss(int argc,
   Code::Flags flags =
       Code::ComputeFlags(kind, MONOMORPHIC_PROTOTYPE_FAILURE, extra_state,
                          NORMAL, argc, OWN_MAP);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
@@ -832,7 +837,8 @@ Handle<Code> StubCache::ComputeCallDebugBreak(int argc,
   Code::Flags flags =
       Code::ComputeFlags(kind, DEBUG_BREAK, Code::kNoExtraICState,
                          NORMAL, argc);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
@@ -850,7 +856,8 @@ Handle<Code> StubCache::ComputeCallDebugPrepareStepIn(int argc,
   Code::Flags flags =
       Code::ComputeFlags(kind, DEBUG_PREPARE_STEP_IN, Code::kNoExtraICState,
                          NORMAL, argc);
-  Handle<NumberDictionary> cache = isolate_->factory()->non_monomorphic_cache();
+  Handle<UnseededNumberDictionary> cache =
+      isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);
   if (entry != -1) return Handle<Code>(Code::cast(cache->ValueAt(entry)));
 
diff --git a/deps/v8/src/type-info.cc b/deps/v8/src/type-info.cc
index 790d77cb1..fcdc6108f 100644
--- a/deps/v8/src/type-info.cc
+++ b/deps/v8/src/type-info.cc
@@ -71,7 +71,7 @@ TypeFeedbackOracle::TypeFeedbackOracle(Handle<Code> code,
 
 Handle<Object> TypeFeedbackOracle::GetInfo(unsigned ast_id) {
   int entry = dictionary_->FindEntry(ast_id);
-  return entry != NumberDictionary::kNotFound
+  return entry != UnseededNumberDictionary::kNotFound
       ? Handle<Object>(dictionary_->ValueAt(entry))
       : Handle<Object>::cast(isolate_->factory()->undefined_value());
 }
@@ -559,7 +559,7 @@ void TypeFeedbackOracle::CreateDictionary(Handle<Code> code,
                                           ZoneList<RelocInfo>* infos) {
   DisableAssertNoAllocation allocation_allowed;
   byte* old_start = code->instruction_start();
-  dictionary_ = FACTORY->NewNumberDictionary(infos->length());
+  dictionary_ = FACTORY->NewUnseededNumberDictionary(infos->length());
   byte* new_start = code->instruction_start();
   RelocateRelocInfos(infos, old_start, new_start);
 }
@@ -639,7 +639,7 @@ void TypeFeedbackOracle::ProcessRelocInfos(ZoneList<RelocInfo>* infos) {
 
 
 void TypeFeedbackOracle::SetInfo(unsigned ast_id, Object* target) {
-  ASSERT(dictionary_->FindEntry(ast_id) == NumberDictionary::kNotFound);
+  ASSERT(dictionary_->FindEntry(ast_id) == UnseededNumberDictionary::kNotFound);
   MaybeObject* maybe_result = dictionary_->AtNumberPut(ast_id, target);
   USE(maybe_result);
 #ifdef DEBUG
diff --git a/deps/v8/src/type-info.h b/deps/v8/src/type-info.h
index 1519fcabb..9d3080abb 100644
--- a/deps/v8/src/type-info.h
+++ b/deps/v8/src/type-info.h
@@ -303,7 +303,7 @@ class TypeFeedbackOracle BASE_EMBEDDED {
 
   Handle<Context> global_context_;
   Isolate* isolate_;
-  Handle<NumberDictionary> dictionary_;
+  Handle<UnseededNumberDictionary> dictionary_;
 
   DISALLOW_COPY_AND_ASSIGN(TypeFeedbackOracle);
 };
diff --git a/deps/v8/src/utils.h b/deps/v8/src/utils.h
index 68b1517de..17bf06ffa 100644
--- a/deps/v8/src/utils.h
+++ b/deps/v8/src/utils.h
@@ -252,10 +252,13 @@ class BitField {
 // ----------------------------------------------------------------------------
 // Hash function.
 
+static const uint32_t kZeroHashSeed = 0;
+
 // Thomas Wang, Integer Hash Functions.
 // http://www.concentric.net/~Ttwang/tech/inthash.htm
-inline uint32_t ComputeIntegerHash(uint32_t key) {
+inline uint32_t ComputeIntegerHash(uint32_t key, uint32_t seed) {
   uint32_t hash = key;
+  hash = hash ^ seed;
   hash = ~hash + (hash << 15);  // hash = (hash << 15) - hash - 1;
   hash = hash ^ (hash >> 12);
   hash = hash + (hash << 2);
@@ -280,7 +283,8 @@ inline uint32_t ComputeLongHash(uint64_t key) {
 
 inline uint32_t ComputePointerHash(void* ptr) {
   return ComputeIntegerHash(
-      static_cast<uint32_t>(reinterpret_cast<intptr_t>(ptr)));
+      static_cast<uint32_t>(reinterpret_cast<intptr_t>(ptr)),
+      v8::internal::kZeroHashSeed);
 }
 
 
diff --git a/deps/v8/src/v8.cc b/deps/v8/src/v8.cc
index c882d86f8..36ee22194 100644
--- a/deps/v8/src/v8.cc
+++ b/deps/v8/src/v8.cc
@@ -47,7 +47,7 @@ static Mutex* init_once_mutex = OS::CreateMutex();
 static bool init_once_called = false;
 
 bool V8::is_running_ = false;
-bool V8::has_been_setup_ = false;
+bool V8::has_been_set_up_ = false;
 bool V8::has_been_disposed_ = false;
 bool V8::has_fatal_error_ = false;
 bool V8::use_crankshaft_ = true;
@@ -82,7 +82,7 @@ bool V8::Initialize(Deserializer* des) {
   if (isolate->IsInitialized()) return true;
 
   is_running_ = true;
-  has_been_setup_ = true;
+  has_been_set_up_ = true;
   has_fatal_error_ = false;
   has_been_disposed_ = false;
 
@@ -100,7 +100,7 @@ void V8::TearDown() {
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate->IsDefaultIsolate());
 
-  if (!has_been_setup_ || has_been_disposed_) return;
+  if (!has_been_set_up_ || has_been_disposed_) return;
   isolate->TearDown();
 
   is_running_ = false;
@@ -239,8 +239,8 @@ void V8::InitializeOncePerProcess() {
   if (init_once_called) return;
   init_once_called = true;
 
-  // Setup the platform OS support.
-  OS::Setup();
+  // Set up the platform OS support.
+  OS::SetUp();
 
   use_crankshaft_ = FLAG_crankshaft;
 
@@ -248,7 +248,7 @@ void V8::InitializeOncePerProcess() {
     use_crankshaft_ = false;
   }
 
-  CPU::Setup();
+  CPU::SetUp();
   if (!CPU::SupportsCrankshaft()) {
     use_crankshaft_ = false;
   }
diff --git a/deps/v8/src/v8.h b/deps/v8/src/v8.h
index b9a3e0538..adfdb3ea8 100644
--- a/deps/v8/src/v8.h
+++ b/deps/v8/src/v8.h
@@ -118,7 +118,7 @@ class V8 : public AllStatic {
   // True if engine is currently running
   static bool is_running_;
   // True if V8 has ever been run
-  static bool has_been_setup_;
+  static bool has_been_set_up_;
   // True if error has been signaled for current engine
   // (reset to false if engine is restarted)
   static bool has_fatal_error_;
diff --git a/deps/v8/src/v8globals.h b/deps/v8/src/v8globals.h
index 005cdbdae..bdb960e8f 100644
--- a/deps/v8/src/v8globals.h
+++ b/deps/v8/src/v8globals.h
@@ -130,7 +130,8 @@ class FixedArray;
 class FunctionLiteral;
 class FunctionTemplateInfo;
 class MemoryChunk;
-class NumberDictionary;
+class SeededNumberDictionary;
+class UnseededNumberDictionary;
 class StringDictionary;
 template <typename T> class Handle;
 class Heap;
diff --git a/deps/v8/src/version.cc b/deps/v8/src/version.cc
index 617b7d1c5..95535851d 100644
--- a/deps/v8/src/version.cc
+++ b/deps/v8/src/version.cc
@@ -34,7 +34,7 @@
 // cannot be changed without changing the SCons build script.
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     8
-#define BUILD_NUMBER      5
+#define BUILD_NUMBER      6
 #define PATCH_LEVEL       0
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/src/win32-headers.h b/deps/v8/src/win32-headers.h
index 0ee330668..ca1b1d8b8 100644
--- a/deps/v8/src/win32-headers.h
+++ b/deps/v8/src/win32-headers.h
@@ -75,7 +75,9 @@
 // makes it impossible to have them elsewhere.
 #include <winsock2.h>
 #include <ws2tcpip.h>
+#ifndef __MINGW32__
 #include <wspiapi.h>
+#endif  // __MINGW32__
 #include <process.h>  // for _beginthreadex()
 #include <stdlib.h>
 #endif  // V8_WIN32_HEADERS_FULL
diff --git a/deps/v8/src/x64/assembler-x64-inl.h b/deps/v8/src/x64/assembler-x64-inl.h
index ab387d6d0..141d092d8 100644
--- a/deps/v8/src/x64/assembler-x64-inl.h
+++ b/deps/v8/src/x64/assembler-x64-inl.h
@@ -262,7 +262,7 @@ Object* RelocInfo::target_object() {
 }
 
 
-Handle<Object> RelocInfo::target_object_handle(Assembler *origin) {
+Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
   ASSERT(IsCodeTarget(rmode_) || rmode_ == EMBEDDED_OBJECT);
   if (rmode_ == EMBEDDED_OBJECT) {
     return Memory::Object_Handle_at(pc_);
diff --git a/deps/v8/src/x64/assembler-x64.cc b/deps/v8/src/x64/assembler-x64.cc
index ca3bece5f..eb8d7d4d9 100644
--- a/deps/v8/src/x64/assembler-x64.cc
+++ b/deps/v8/src/x64/assembler-x64.cc
@@ -383,7 +383,7 @@ Assembler::Assembler(Isolate* arg_isolate, void* buffer, int buffer_size)
   }
 #endif
 
-  // Setup buffer pointers.
+  // Set up buffer pointers.
   ASSERT(buffer_ != NULL);
   pc_ = buffer_;
   reloc_info_writer.Reposition(buffer_ + buffer_size, pc_);
@@ -412,7 +412,7 @@ void Assembler::GetCode(CodeDesc* desc) {
   // Finalize code (at this point overflow() may be true, but the gap ensures
   // that we are still not overlapping instructions and relocation info).
   ASSERT(pc_ <= reloc_info_writer.pos());  // No overlap.
-  // Setup code descriptor.
+  // Set up code descriptor.
   desc->buffer = buffer_;
   desc->buffer_size = buffer_size_;
   desc->instr_size = pc_offset();
@@ -502,7 +502,7 @@ void Assembler::GrowBuffer() {
     V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
   }
 
-  // Setup new buffer.
+  // Set up new buffer.
   desc.buffer = NewArray<byte>(desc.buffer_size);
   desc.instr_size = pc_offset();
   desc.reloc_size =
diff --git a/deps/v8/src/x64/builtins-x64.cc b/deps/v8/src/x64/builtins-x64.cc
index ef63c7a27..4833e03c8 100644
--- a/deps/v8/src/x64/builtins-x64.cc
+++ b/deps/v8/src/x64/builtins-x64.cc
@@ -337,7 +337,7 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     __ push(rbx);
     __ push(rbx);
 
-    // Setup pointer to last argument.
+    // Set up pointer to last argument.
     __ lea(rbx, Operand(rbp, StandardFrameConstants::kCallerSPOffset));
 
     // Copy arguments and receiver to the expression stack.
@@ -1198,7 +1198,7 @@ static void AllocateJSArray(MacroAssembler* masm,
 // Both registers are preserved by this code so no need to differentiate between
 // a construct call and a normal call.
 static void ArrayNativeCode(MacroAssembler* masm,
-                            Label *call_generic_code) {
+                            Label* call_generic_code) {
   Label argc_one_or_more, argc_two_or_more, empty_array, not_empty_array,
       has_non_smi_element;
 
diff --git a/deps/v8/src/x64/code-stubs-x64.cc b/deps/v8/src/x64/code-stubs-x64.cc
index ea9c494e8..03a5170ba 100644
--- a/deps/v8/src/x64/code-stubs-x64.cc
+++ b/deps/v8/src/x64/code-stubs-x64.cc
@@ -124,12 +124,12 @@ void FastNewContextStub::Generate(MacroAssembler* masm) {
   // Get the function from the stack.
   __ movq(rcx, Operand(rsp, 1 * kPointerSize));
 
-  // Setup the object header.
+  // Set up the object header.
   __ LoadRoot(kScratchRegister, Heap::kFunctionContextMapRootIndex);
   __ movq(FieldOperand(rax, HeapObject::kMapOffset), kScratchRegister);
   __ Move(FieldOperand(rax, FixedArray::kLengthOffset), Smi::FromInt(length));
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ Set(rbx, 0);  // Set to NULL.
   __ movq(Operand(rax, Context::SlotOffset(Context::CLOSURE_INDEX)), rcx);
   __ movq(Operand(rax, Context::SlotOffset(Context::PREVIOUS_INDEX)), rsi);
@@ -173,7 +173,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   // Get the serialized scope info from the stack.
   __ movq(rbx, Operand(rsp, 2 * kPointerSize));
 
-  // Setup the object header.
+  // Set up the object header.
   __ LoadRoot(kScratchRegister, Heap::kBlockContextMapRootIndex);
   __ movq(FieldOperand(rax, HeapObject::kMapOffset), kScratchRegister);
   __ Move(FieldOperand(rax, FixedArray::kLengthOffset), Smi::FromInt(length));
@@ -194,7 +194,7 @@ void FastNewBlockContextStub::Generate(MacroAssembler* masm) {
   __ movq(rcx, ContextOperand(rcx, Context::CLOSURE_INDEX));
   __ bind(&after_sentinel);
 
-  // Setup the fixed slots.
+  // Set up the fixed slots.
   __ movq(ContextOperand(rax, Context::CLOSURE_INDEX), rcx);
   __ movq(ContextOperand(rax, Context::PREVIOUS_INDEX), rsi);
   __ movq(ContextOperand(rax, Context::EXTENSION_INDEX), rbx);
@@ -2399,7 +2399,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
     __ movq(FieldOperand(rax, i), rdx);
   }
 
-  // Setup the callee in-object property.
+  // Set up the callee in-object property.
   STATIC_ASSERT(Heap::kArgumentsCalleeIndex == 1);
   __ movq(rdx, Operand(rsp, 3 * kPointerSize));
   __ movq(FieldOperand(rax, JSObject::kHeaderSize +
@@ -2414,7 +2414,7 @@ void ArgumentsAccessStub::GenerateNewNonStrictFast(MacroAssembler* masm) {
                        Heap::kArgumentsLengthIndex * kPointerSize),
           rcx);
 
-  // Setup the elements pointer in the allocated arguments object.
+  // Set up the elements pointer in the allocated arguments object.
   // If we allocated a parameter map, edi will point there, otherwise to the
   // backing store.
   __ lea(rdi, Operand(rax, Heap::kArgumentsObjectSize));
@@ -2621,7 +2621,7 @@ void ArgumentsAccessStub::GenerateNewStrict(MacroAssembler* masm) {
   // Get the parameters pointer from the stack.
   __ movq(rdx, Operand(rsp, 2 * kPointerSize));
 
-  // Setup the elements pointer in the allocated arguments object and
+  // Set up the elements pointer in the allocated arguments object and
   // initialize the header in the elements fixed array.
   __ lea(rdi, Operand(rax, Heap::kArgumentsObjectSizeStrict));
   __ movq(FieldOperand(rax, JSObject::kElementsOffset), rdi);
@@ -3942,7 +3942,7 @@ void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) {
   Label not_outermost_js, not_outermost_js_2;
   {  // NOLINT. Scope block confuses linter.
     MacroAssembler::NoRootArrayScope uninitialized_root_register(masm);
-    // Setup frame.
+    // Set up frame.
     __ push(rbp);
     __ movq(rbp, rsp);
 
@@ -4156,12 +4156,14 @@ void InstanceofStub::Generate(MacroAssembler* masm) {
     // Get return address and delta to inlined map check.
     __ movq(kScratchRegister, Operand(rsp, 0 * kPointerSize));
     __ subq(kScratchRegister, Operand(rsp, 1 * kPointerSize));
-    __ movq(Operand(kScratchRegister, kOffsetToMapCheckValue), rax);
     if (FLAG_debug_code) {
       __ movl(rdi, Immediate(kWordBeforeMapCheckValue));
       __ cmpl(Operand(kScratchRegister, kOffsetToMapCheckValue - 4), rdi);
       __ Assert(equal, "InstanceofStub unexpected call site cache (check).");
     }
+    __ movq(kScratchRegister,
+            Operand(kScratchRegister, kOffsetToMapCheckValue));
+    __ movq(Operand(kScratchRegister, 0), rax);
   }
 
   __ movq(rcx, FieldOperand(rax, Map::kPrototypeOffset));
@@ -4959,7 +4961,7 @@ void StringHelper::GenerateHashInit(MacroAssembler* masm,
                                     Register character,
                                     Register scratch) {
   // hash = (seed + character) + ((seed + character) << 10);
-  __ LoadRoot(scratch, Heap::kStringHashSeedRootIndex);
+  __ LoadRoot(scratch, Heap::kHashSeedRootIndex);
   __ SmiToInteger32(scratch, scratch);
   __ addl(scratch, character);
   __ movl(hash, scratch);
@@ -5003,13 +5005,12 @@ void StringHelper::GenerateHashGetHash(MacroAssembler* masm,
   __ shll(scratch, Immediate(15));
   __ addl(hash, scratch);
 
-  uint32_t kHashShiftCutOffMask = (1 << (32 - String::kHashShift)) - 1;
-  __ andl(hash, Immediate(kHashShiftCutOffMask));
+  __ andl(hash, Immediate(String::kHashBitMask));
 
   // if (hash == 0) hash = 27;
   Label hash_not_zero;
   __ j(not_zero, &hash_not_zero);
-  __ Set(hash, 27);
+  __ Set(hash, StringHasher::kZeroHash);
   __ bind(&hash_not_zero);
 }
 
@@ -5080,7 +5081,7 @@ void SubStringStub::Generate(MacroAssembler* masm) {
   __ ret(3 * kPointerSize);
 
   __ bind(&make_two_character_string);
-  // Setup registers for allocating the two character string.
+  // Set up registers for allocating the two character string.
   __ movzxwq(rbx, FieldOperand(rax, rdx, times_1, SeqAsciiString::kHeaderSize));
   __ AllocateAsciiString(rax, rcx, r11, r14, r15, &runtime);
   __ movw(FieldOperand(rax, SeqAsciiString::kHeaderSize), rbx);
diff --git a/deps/v8/src/x64/cpu-x64.cc b/deps/v8/src/x64/cpu-x64.cc
index ae5045f0d..69e77eee9 100644
--- a/deps/v8/src/x64/cpu-x64.cc
+++ b/deps/v8/src/x64/cpu-x64.cc
@@ -41,7 +41,7 @@
 namespace v8 {
 namespace internal {
 
-void CPU::Setup() {
+void CPU::SetUp() {
   CpuFeatures::Probe();
 }
 
diff --git a/deps/v8/src/x64/deoptimizer-x64.cc b/deps/v8/src/x64/deoptimizer-x64.cc
index d684ad713..a5a171a2a 100644
--- a/deps/v8/src/x64/deoptimizer-x64.cc
+++ b/deps/v8/src/x64/deoptimizer-x64.cc
@@ -314,7 +314,7 @@ void Deoptimizer::DoComputeOsrOutputFrame() {
     output_[0] = input_;
     output_[0]->SetPc(reinterpret_cast<intptr_t>(from_));
   } else {
-    // Setup the frame pointer and the context pointer.
+    // Set up the frame pointer and the context pointer.
     output_[0]->SetRegister(rbp.code(), input_->GetRegister(rbp.code()));
     output_[0]->SetRegister(rsi.code(), input_->GetRegister(rsi.code()));
 
diff --git a/deps/v8/src/x64/full-codegen-x64.cc b/deps/v8/src/x64/full-codegen-x64.cc
index 24df20ba7..eeef0e94e 100644
--- a/deps/v8/src/x64/full-codegen-x64.cc
+++ b/deps/v8/src/x64/full-codegen-x64.cc
@@ -967,7 +967,7 @@ void FullCodeGenerator::VisitForInStatement(ForInStatement* stmt) {
   __ movq(rcx, FieldOperand(rcx, DescriptorArray::kEnumerationIndexOffset));
   __ movq(rdx, FieldOperand(rcx, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
-  // Setup the four remaining stack slots.
+  // Set up the four remaining stack slots.
   __ push(rax);  // Map.
   __ push(rdx);  // Enumeration cache.
   __ movq(rax, FieldOperand(rdx, FixedArray::kLengthOffset));
diff --git a/deps/v8/src/x64/lithium-codegen-x64.cc b/deps/v8/src/x64/lithium-codegen-x64.cc
index 6239acb51..392c74dc2 100644
--- a/deps/v8/src/x64/lithium-codegen-x64.cc
+++ b/deps/v8/src/x64/lithium-codegen-x64.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1755,13 +1755,17 @@ void LCodeGen::DoHasCachedArrayIndexAndBranch(
 
 
 // Branches to a label or falls through with the answer in the z flag.
-// Trashes the temp register and possibly input (if it and temp are aliased).
+// Trashes the temp register.
 void LCodeGen::EmitClassOfTest(Label* is_true,
                                Label* is_false,
                                Handle<String> class_name,
                                Register input,
                                Register temp,
-                               Register scratch) {
+                               Register temp2) {
+  ASSERT(!input.is(temp));
+  ASSERT(!input.is(temp2));
+  ASSERT(!temp.is(temp2));
+
   __ JumpIfSmi(input, is_false);
 
   if (class_name->IsEqualTo(CStrVector("Function"))) {
@@ -1782,9 +1786,9 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
     // Faster code path to avoid two compares: subtract lower bound from the
     // actual type and do a signed compare with the width of the type range.
     __ movq(temp, FieldOperand(input, HeapObject::kMapOffset));
-    __ movq(scratch, FieldOperand(temp, Map::kInstanceTypeOffset));
-    __ subb(scratch, Immediate(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
-    __ cmpb(scratch,
+    __ movq(temp2, FieldOperand(temp, Map::kInstanceTypeOffset));
+    __ subb(temp2, Immediate(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
+    __ cmpb(temp2,
             Immediate(static_cast<int8_t>(LAST_NONCALLABLE_SPEC_OBJECT_TYPE -
                                           FIRST_NONCALLABLE_SPEC_OBJECT_TYPE)));
     __ j(above, is_false);
@@ -1897,9 +1901,10 @@ void LCodeGen::DoInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr) {
   Register map = ToRegister(instr->TempAt(0));
   __ movq(map, FieldOperand(object, HeapObject::kMapOffset));
   __ bind(deferred->map_check());  // Label for calculating code patching.
-  __ movq(kScratchRegister, factory()->the_hole_value(),
-          RelocInfo::EMBEDDED_OBJECT);
-  __ cmpq(map, kScratchRegister);  // Patched to cached map.
+  Handle<JSGlobalPropertyCell> cache_cell =
+      factory()->NewJSGlobalPropertyCell(factory()->the_hole_value());
+  __ movq(kScratchRegister, cache_cell, RelocInfo::GLOBAL_PROPERTY_CELL);
+  __ cmpq(map, Operand(kScratchRegister, 0));
   __ j(not_equal, &cache_miss, Label::kNear);
   // Patched to load either true or false.
   __ LoadRoot(ToRegister(instr->result()), Heap::kTheHoleValueRootIndex);
@@ -2636,7 +2641,7 @@ void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
     __ call(FieldOperand(rdi, JSFunction::kCodeEntryOffset));
   }
 
-  // Setup deoptimization.
+  // Set up deoptimization.
   RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT, 0);
 
   // Restore context.
@@ -2926,6 +2931,38 @@ void LCodeGen::DoPower(LPower* instr) {
 }
 
 
+void LCodeGen::DoRandom(LRandom* instr) {
+  // Having marked this instruction as a call we can use any
+  // registers.
+  ASSERT(ToDoubleRegister(instr->result()).is(xmm1));
+
+  // Choose the right register for the first argument depending on
+  // calling convention.
+#ifdef _WIN64
+  ASSERT(ToRegister(instr->InputAt(0)).is(rcx));
+  Register global_object = rcx;
+#else
+  ASSERT(ToRegister(instr->InputAt(0)).is(rdi));
+  Register global_object = rdi;
+#endif
+
+  __ PrepareCallCFunction(1);
+  __ movq(global_object,
+          FieldOperand(global_object, GlobalObject::kGlobalContextOffset));
+  __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);
+
+  // Convert 32 random bits in rax to 0.(32 random bits) in a double
+  // by computing:
+  // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
+  __ movl(rcx, Immediate(0x49800000));  // 1.0 x 2^20 as single.
+  __ movd(xmm2, rcx);
+  __ movd(xmm1, rax);
+  __ cvtss2sd(xmm2, xmm2);
+  __ xorps(xmm1, xmm2);
+  __ subsd(xmm1, xmm2);
+}
+
+
 void LCodeGen::DoMathLog(LUnaryMathOperation* instr) {
   ASSERT(ToDoubleRegister(instr->result()).is(xmm1));
   TranscendentalCacheStub stub(TranscendentalCache::LOG,
@@ -3510,6 +3547,7 @@ void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
 void LCodeGen::EmitNumberUntagD(Register input_reg,
                                 XMMRegister result_reg,
                                 bool deoptimize_on_undefined,
+                                bool deoptimize_on_minus_zero,
                                 LEnvironment* env) {
   Label load_smi, done;
 
@@ -3537,6 +3575,15 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
   }
   // Heap number to XMM conversion.
   __ movsd(result_reg, FieldOperand(input_reg, HeapNumber::kValueOffset));
+  if (deoptimize_on_minus_zero) {
+    XMMRegister xmm_scratch = xmm0;
+    __ xorps(xmm_scratch, xmm_scratch);
+    __ ucomisd(xmm_scratch, result_reg);
+    __ j(not_equal, &done, Label::kNear);
+    __ movmskpd(kScratchRegister, result_reg);
+    __ testq(kScratchRegister, Immediate(1));
+    DeoptimizeIf(not_zero, env);
+  }
   __ jmp(&done, Label::kNear);
 
   // Smi to XMM conversion
@@ -3628,6 +3675,7 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
 
   EmitNumberUntagD(input_reg, result_reg,
                    instr->hydrogen()->deoptimize_on_undefined(),
+                   instr->hydrogen()->deoptimize_on_minus_zero(),
                    instr->environment());
 }
 
@@ -3747,13 +3795,23 @@ void LCodeGen::DoCheckFunction(LCheckFunction* instr) {
 }
 
 
+void LCodeGen::DoCheckMapCommon(Register reg,
+                                Handle<Map> map,
+                                CompareMapMode mode,
+                                LEnvironment* env) {
+  Label success;
+  __ CompareMap(reg, map, &success, mode);
+  DeoptimizeIf(not_equal, env);
+  __ bind(&success);
+}
+
+
 void LCodeGen::DoCheckMap(LCheckMap* instr) {
   LOperand* input = instr->InputAt(0);
   ASSERT(input->IsRegister());
   Register reg = ToRegister(input);
-  __ Cmp(FieldOperand(reg, HeapObject::kMapOffset),
-         instr->hydrogen()->map());
-  DeoptimizeIf(not_equal, instr->environment());
+  Handle<Map> map = instr->hydrogen()->map();
+  DoCheckMapCommon(reg, map, instr->hydrogen()->mode(), instr->environment());
 }
 
 
@@ -3819,9 +3877,8 @@ void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
 
   // Check prototype maps up to the holder.
   while (!current_prototype.is_identical_to(holder)) {
-    __ Cmp(FieldOperand(reg, HeapObject::kMapOffset),
-           Handle<Map>(current_prototype->map()));
-    DeoptimizeIf(not_equal, instr->environment());
+    DoCheckMapCommon(reg, Handle<Map>(current_prototype->map()),
+                     ALLOW_ELEMENT_TRANSITION_MAPS, instr->environment());
     current_prototype =
         Handle<JSObject>(JSObject::cast(current_prototype->GetPrototype()));
     // Load next prototype object.
@@ -3829,9 +3886,8 @@ void LCodeGen::DoCheckPrototypeMaps(LCheckPrototypeMaps* instr) {
   }
 
   // Check the holder map.
-  __ Cmp(FieldOperand(reg, HeapObject::kMapOffset),
-         Handle<Map>(current_prototype->map()));
-  DeoptimizeIf(not_equal, instr->environment());
+    DoCheckMapCommon(reg, Handle<Map>(current_prototype->map()),
+                     ALLOW_ELEMENT_TRANSITION_MAPS, instr->environment());
 }
 
 
@@ -3855,7 +3911,7 @@ void LCodeGen::DoArrayLiteral(LArrayLiteral* instr) {
     DeoptimizeIf(not_equal, instr->environment());
   }
 
-  // Setup the parameters to the stub/runtime call.
+  // Set up the parameters to the stub/runtime call.
   __ movq(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   __ push(FieldOperand(rax, JSFunction::kLiteralsOffset));
   __ Push(Smi::FromInt(instr->hydrogen()->literal_index()));
@@ -3956,7 +4012,7 @@ void LCodeGen::DoObjectLiteralGeneric(LObjectLiteralGeneric* instr) {
   Handle<FixedArray> constant_properties =
       instr->hydrogen()->constant_properties();
 
-  // Setup the parameters to the stub/runtime call.
+  // Set up the parameters to the stub/runtime call.
   __ movq(rax, Operand(rbp, JavaScriptFrameConstants::kFunctionOffset));
   __ push(FieldOperand(rax, JSFunction::kLiteralsOffset));
   __ Push(Smi::FromInt(instr->hydrogen()->literal_index()));
diff --git a/deps/v8/src/x64/lithium-codegen-x64.h b/deps/v8/src/x64/lithium-codegen-x64.h
index 832942f1e..2890c530b 100644
--- a/deps/v8/src/x64/lithium-codegen-x64.h
+++ b/deps/v8/src/x64/lithium-codegen-x64.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -102,7 +102,10 @@ class LCodeGen BASE_EMBEDDED {
   void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
                                        Label* map_check);
 
-  // Parallel move support.
+  void DoCheckMapCommon(Register reg, Handle<Map> map,
+                        CompareMapMode mode, LEnvironment* env);
+
+// Parallel move support.
   void DoParallelMove(LParallelMove* move);
   void DoGap(LGap* instr);
 
@@ -252,6 +255,7 @@ class LCodeGen BASE_EMBEDDED {
   void EmitNumberUntagD(Register input,
                         XMMRegister result,
                         bool deoptimize_on_undefined,
+                        bool deoptimize_on_minus_zero,
                         LEnvironment* env);
 
   // Emits optimized code for typeof x == "y".  Modifies input register.
@@ -372,7 +376,7 @@ class LDeferredCode: public ZoneObject {
   virtual void Generate() = 0;
   virtual LInstruction* instr() = 0;
 
-  void SetExit(Label *exit) { external_exit_ = exit; }
+  void SetExit(Label* exit) { external_exit_ = exit; }
   Label* entry() { return &entry_; }
   Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
   int instruction_index() const { return instruction_index_; }
diff --git a/deps/v8/src/x64/lithium-x64.cc b/deps/v8/src/x64/lithium-x64.cc
index 5bae14bfa..fee2f4f2a 100644
--- a/deps/v8/src/x64/lithium-x64.cc
+++ b/deps/v8/src/x64/lithium-x64.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1033,16 +1033,25 @@ LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
 
 
 LInstruction* LChunkBuilder::DoBranch(HBranch* instr) {
-  HValue* v = instr->value();
-  if (v->EmitAtUses()) {
-    ASSERT(v->IsConstant());
-    ASSERT(!v->representation().IsDouble());
-    HBasicBlock* successor = HConstant::cast(v)->ToBoolean()
+  HValue* value = instr->value();
+  if (value->EmitAtUses()) {
+    ASSERT(value->IsConstant());
+    ASSERT(!value->representation().IsDouble());
+    HBasicBlock* successor = HConstant::cast(value)->ToBoolean()
         ? instr->FirstSuccessor()
         : instr->SecondSuccessor();
     return new LGoto(successor->block_id());
   }
-  return AssignEnvironment(new LBranch(UseRegister(v)));
+
+  LBranch* result = new LBranch(UseRegister(value));
+  // Tagged values that are not known smis or booleans require a
+  // deoptimization environment.
+  Representation rep = value->representation();
+  HType type = value->type();
+  if (rep.IsTagged() && !type.IsSmi() && !type.IsBoolean()) {
+    return AssignEnvironment(result);
+  }
+  return result;
 }
 
 
@@ -1329,7 +1338,11 @@ LInstruction* LChunkBuilder::DoMul(HMul* instr) {
     LOperand* left = UseRegisterAtStart(instr->LeastConstantOperand());
     LOperand* right = UseOrConstant(instr->MostConstantOperand());
     LMulI* mul = new LMulI(left, right);
-    return AssignEnvironment(DefineSameAsFirst(mul));
+    if (instr->CheckFlag(HValue::kCanOverflow) ||
+        instr->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      AssignEnvironment(mul);
+    }
+    return DefineSameAsFirst(mul);
   } else if (instr->representation().IsDouble()) {
     return DoArithmeticD(Token::MUL, instr);
   } else {
@@ -1402,6 +1415,19 @@ LInstruction* LChunkBuilder::DoPower(HPower* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
+  ASSERT(instr->representation().IsDouble());
+  ASSERT(instr->global_object()->representation().IsTagged());
+#ifdef _WIN64
+  LOperand* global_object = UseFixed(instr->global_object(), rcx);
+#else
+  LOperand* global_object = UseFixed(instr->global_object(), rdi);
+#endif
+  LRandom* result = new LRandom(global_object);
+  return MarkAsCall(DefineFixedDouble(result, xmm1), instr);
+}
+
+
 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
   ASSERT(instr->left()->representation().IsTagged());
   ASSERT(instr->right()->representation().IsTagged());
@@ -1525,7 +1551,7 @@ LInstruction* LChunkBuilder::DoHasCachedArrayIndexAndBranch(
 
 LInstruction* LChunkBuilder::DoClassOfTestAndBranch(
     HClassOfTestAndBranch* instr) {
-  return new LClassOfTestAndBranch(UseTempRegister(instr->value()),
+  return new LClassOfTestAndBranch(UseRegister(instr->value()),
                                    TempRegister(),
                                    TempRegister());
 }
@@ -1553,7 +1579,7 @@ LInstruction* LChunkBuilder::DoElementsKind(HElementsKind* instr) {
 LInstruction* LChunkBuilder::DoValueOf(HValueOf* instr) {
   LOperand* object = UseRegister(instr->value());
   LValueOf* result = new LValueOf(object);
-  return AssignEnvironment(DefineSameAsFirst(result));
+  return DefineSameAsFirst(result);
 }
 
 
@@ -1866,7 +1892,8 @@ LInstruction* LChunkBuilder::DoLoadKeyedFastElement(
   LOperand* obj = UseRegisterAtStart(instr->object());
   LOperand* key = UseRegisterOrConstantAtStart(instr->key());
   LLoadKeyedFastElement* result = new LLoadKeyedFastElement(obj, key);
-  return AssignEnvironment(DefineAsRegister(result));
+  if (instr->RequiresHoleCheck()) AssignEnvironment(result);
+  return DefineAsRegister(result);
 }
 
 
diff --git a/deps/v8/src/x64/lithium-x64.h b/deps/v8/src/x64/lithium-x64.h
index c6fcfeb81..193f0389d 100644
--- a/deps/v8/src/x64/lithium-x64.h
+++ b/deps/v8/src/x64/lithium-x64.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -141,6 +141,7 @@ class LCodeGen;
   V(Parameter)                                  \
   V(Power)                                      \
   V(PushArgument)                               \
+  V(Random)                                     \
   V(RegExpLiteral)                              \
   V(Return)                                     \
   V(ShiftI)                                     \
@@ -1024,6 +1025,17 @@ class LPower: public LTemplateInstruction<1, 2, 0> {
 };
 
 
+class LRandom: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LRandom(LOperand* global_object) {
+    inputs_[0] = global_object;
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Random, "random")
+  DECLARE_HYDROGEN_ACCESSOR(Random)
+};
+
+
 class LArithmeticD: public LTemplateInstruction<1, 2, 0> {
  public:
   LArithmeticD(Token::Value op, LOperand* left, LOperand* right)
diff --git a/deps/v8/src/x64/macro-assembler-x64.cc b/deps/v8/src/x64/macro-assembler-x64.cc
index 10e423b5b..47553697a 100644
--- a/deps/v8/src/x64/macro-assembler-x64.cc
+++ b/deps/v8/src/x64/macro-assembler-x64.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -495,7 +495,7 @@ void MacroAssembler::Abort(const char* msg) {
   // from the real pointer as a smi.
   intptr_t p1 = reinterpret_cast<intptr_t>(msg);
   intptr_t p0 = (p1 & ~kSmiTagMask) + kSmiTag;
-  // Note: p0 might not be a valid Smi *value*, but it has a valid Smi tag.
+  // Note: p0 might not be a valid Smi _value_, but it has a valid Smi tag.
   ASSERT(reinterpret_cast<Object*>(p0)->IsSmi());
 #ifdef DEBUG
   if (msg != NULL) {
@@ -2739,15 +2739,48 @@ void MacroAssembler::StoreNumberToDoubleElements(
 }
 
 
+void MacroAssembler::CompareMap(Register obj,
+                                Handle<Map> map,
+                                Label* early_success,
+                                CompareMapMode mode) {
+  Cmp(FieldOperand(obj, HeapObject::kMapOffset), map);
+  if (mode == ALLOW_ELEMENT_TRANSITION_MAPS) {
+    Map* transitioned_fast_element_map(
+        map->LookupElementsTransitionMap(FAST_ELEMENTS, NULL));
+    ASSERT(transitioned_fast_element_map == NULL ||
+           map->elements_kind() != FAST_ELEMENTS);
+    if (transitioned_fast_element_map != NULL) {
+      j(equal, early_success, Label::kNear);
+      Cmp(FieldOperand(obj, HeapObject::kMapOffset),
+          Handle<Map>(transitioned_fast_element_map));
+    }
+
+    Map* transitioned_double_map(
+        map->LookupElementsTransitionMap(FAST_DOUBLE_ELEMENTS, NULL));
+    ASSERT(transitioned_double_map == NULL ||
+           map->elements_kind() == FAST_SMI_ONLY_ELEMENTS);
+    if (transitioned_double_map != NULL) {
+      j(equal, early_success, Label::kNear);
+      Cmp(FieldOperand(obj, HeapObject::kMapOffset),
+          Handle<Map>(transitioned_double_map));
+    }
+  }
+}
+
+
 void MacroAssembler::CheckMap(Register obj,
                               Handle<Map> map,
                               Label* fail,
-                              SmiCheckType smi_check_type) {
+                              SmiCheckType smi_check_type,
+                              CompareMapMode mode) {
   if (smi_check_type == DO_SMI_CHECK) {
     JumpIfSmi(obj, fail);
   }
-  Cmp(FieldOperand(obj, HeapObject::kMapOffset), map);
+
+  Label success;
+  CompareMap(obj, map, &success, mode);
   j(not_equal, fail);
+  bind(&success);
 }
 
 
@@ -3198,7 +3231,7 @@ void MacroAssembler::LeaveFrame(StackFrame::Type type) {
 
 
 void MacroAssembler::EnterExitFramePrologue(bool save_rax) {
-  // Setup the frame structure on the stack.
+  // Set up the frame structure on the stack.
   // All constants are relative to the frame pointer of the exit frame.
   ASSERT(ExitFrameConstants::kCallerSPDisplacement == +2 * kPointerSize);
   ASSERT(ExitFrameConstants::kCallerPCOffset == +1 * kPointerSize);
@@ -3258,7 +3291,7 @@ void MacroAssembler::EnterExitFrameEpilogue(int arg_stack_space,
 void MacroAssembler::EnterExitFrame(int arg_stack_space, bool save_doubles) {
   EnterExitFramePrologue(true);
 
-  // Setup argv in callee-saved register r15. It is reused in LeaveExitFrame,
+  // Set up argv in callee-saved register r15. It is reused in LeaveExitFrame,
   // so it must be retained across the C-call.
   int offset = StandardFrameConstants::kCallerSPOffset - kPointerSize;
   lea(r15, Operand(rbp, r14, times_pointer_size, offset));
@@ -3386,6 +3419,42 @@ void MacroAssembler::CheckAccessGlobalProxy(Register holder_reg,
 }
 
 
+void MacroAssembler::GetNumberHash(Register r0, Register scratch) {
+  // First of all we assign the hash seed to scratch.
+  LoadRoot(scratch, Heap::kHashSeedRootIndex);
+  SmiToInteger32(scratch, scratch);
+
+  // Xor original key with a seed.
+  xorl(r0, scratch);
+
+  // Compute the hash code from the untagged key.  This must be kept in sync
+  // with ComputeIntegerHash in utils.h.
+  //
+  // hash = ~hash + (hash << 15);
+  movl(scratch, r0);
+  notl(r0);
+  shll(scratch, Immediate(15));
+  addl(r0, scratch);
+  // hash = hash ^ (hash >> 12);
+  movl(scratch, r0);
+  shrl(scratch, Immediate(12));
+  xorl(r0, scratch);
+  // hash = hash + (hash << 2);
+  leal(r0, Operand(r0, r0, times_4, 0));
+  // hash = hash ^ (hash >> 4);
+  movl(scratch, r0);
+  shrl(scratch, Immediate(4));
+  xorl(r0, scratch);
+  // hash = hash * 2057;
+  imull(r0, r0, Immediate(2057));
+  // hash = hash ^ (hash >> 16);
+  movl(scratch, r0);
+  shrl(scratch, Immediate(16));
+  xorl(r0, scratch);
+}
+
+
+
 void MacroAssembler::LoadFromNumberDictionary(Label* miss,
                                               Register elements,
                                               Register key,
@@ -3416,34 +3485,11 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
 
   Label done;
 
-  // Compute the hash code from the untagged key.  This must be kept in sync
-  // with ComputeIntegerHash in utils.h.
-  //
-  // hash = ~hash + (hash << 15);
-  movl(r1, r0);
-  notl(r0);
-  shll(r1, Immediate(15));
-  addl(r0, r1);
-  // hash = hash ^ (hash >> 12);
-  movl(r1, r0);
-  shrl(r1, Immediate(12));
-  xorl(r0, r1);
-  // hash = hash + (hash << 2);
-  leal(r0, Operand(r0, r0, times_4, 0));
-  // hash = hash ^ (hash >> 4);
-  movl(r1, r0);
-  shrl(r1, Immediate(4));
-  xorl(r0, r1);
-  // hash = hash * 2057;
-  imull(r0, r0, Immediate(2057));
-  // hash = hash ^ (hash >> 16);
-  movl(r1, r0);
-  shrl(r1, Immediate(16));
-  xorl(r0, r1);
+  GetNumberHash(r0, r1);
 
   // Compute capacity mask.
-  SmiToInteger32(r1,
-                 FieldOperand(elements, NumberDictionary::kCapacityOffset));
+  SmiToInteger32(r1, FieldOperand(elements,
+                                  SeededNumberDictionary::kCapacityOffset));
   decl(r1);
 
   // Generate an unrolled loop that performs a few probes before giving up.
@@ -3453,19 +3499,19 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
     movq(r2, r0);
     // Compute the masked index: (hash + i + i * i) & mask.
     if (i > 0) {
-      addl(r2, Immediate(NumberDictionary::GetProbeOffset(i)));
+      addl(r2, Immediate(SeededNumberDictionary::GetProbeOffset(i)));
     }
     and_(r2, r1);
 
     // Scale the index by multiplying by the entry size.
-    ASSERT(NumberDictionary::kEntrySize == 3);
+    ASSERT(SeededNumberDictionary::kEntrySize == 3);
     lea(r2, Operand(r2, r2, times_2, 0));  // r2 = r2 * 3
 
     // Check if the key matches.
     cmpq(key, FieldOperand(elements,
                            r2,
                            times_pointer_size,
-                           NumberDictionary::kElementsStartOffset));
+                           SeededNumberDictionary::kElementsStartOffset));
     if (i != (kProbes - 1)) {
       j(equal, &done);
     } else {
@@ -3476,7 +3522,7 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
   bind(&done);
   // Check that the value is a normal propety.
   const int kDetailsOffset =
-      NumberDictionary::kElementsStartOffset + 2 * kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + 2 * kPointerSize;
   ASSERT_EQ(NORMAL, 0);
   Test(FieldOperand(elements, r2, times_pointer_size, kDetailsOffset),
        Smi::FromInt(PropertyDetails::TypeField::kMask));
@@ -3484,7 +3530,7 @@ void MacroAssembler::LoadFromNumberDictionary(Label* miss,
 
   // Get the value at the masked, scaled index.
   const int kValueOffset =
-      NumberDictionary::kElementsStartOffset + kPointerSize;
+      SeededNumberDictionary::kElementsStartOffset + kPointerSize;
   movq(result, FieldOperand(elements, r2, times_pointer_size, kValueOffset));
 }
 
diff --git a/deps/v8/src/x64/macro-assembler-x64.h b/deps/v8/src/x64/macro-assembler-x64.h
index 97a98017c..8596852db 100644
--- a/deps/v8/src/x64/macro-assembler-x64.h
+++ b/deps/v8/src/x64/macro-assembler-x64.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -328,7 +328,7 @@ class MacroAssembler: public Assembler {
   // ---------------------------------------------------------------------------
   // JavaScript invokes
 
-  // Setup call kind marking in rcx. The method takes rcx as an
+  // Set up call kind marking in rcx. The method takes rcx as an
   // explicit first parameter to make the code more readable at the
   // call sites.
   void SetCallKind(Register dst, CallKind kind);
@@ -889,13 +889,24 @@ class MacroAssembler: public Assembler {
                                    XMMRegister xmm_scratch,
                                    Label* fail);
 
-  // Check if the map of an object is equal to a specified map and
-  // branch to label if not. Skip the smi check if not required
-  // (object is known to be a heap object)
+  // Compare an object's map with the specified map and its transitioned
+  // elements maps if mode is ALLOW_ELEMENT_TRANSITION_MAPS. FLAGS are set with
+  // result of map compare. If multiple map compares are required, the compare
+  // sequences branches to early_success.
+  void CompareMap(Register obj,
+                  Handle<Map> map,
+                  Label* early_success,
+                  CompareMapMode mode = REQUIRE_EXACT_MAP);
+
+  // Check if the map of an object is equal to a specified map and branch to
+  // label if not. Skip the smi check if not required (object is known to be a
+  // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match
+  // against maps that are ElementsKind transition maps of the specificed map.
   void CheckMap(Register obj,
                 Handle<Map> map,
                 Label* fail,
-                SmiCheckType smi_check_type);
+                SmiCheckType smi_check_type,
+                CompareMapMode mode = REQUIRE_EXACT_MAP);
 
   // Check if the map of an object is equal to a specified map and branch to a
   // specified target if equal. Skip the smi check if not required (object is
@@ -975,6 +986,7 @@ class MacroAssembler: public Assembler {
                               Register scratch,
                               Label* miss);
 
+  void GetNumberHash(Register r0, Register scratch);
 
   void LoadFromNumberDictionary(Label* miss,
                                 Register elements,
diff --git a/deps/v8/src/x64/stub-cache-x64.cc b/deps/v8/src/x64/stub-cache-x64.cc
index a28dbbf02..3633fbbce 100644
--- a/deps/v8/src/x64/stub-cache-x64.cc
+++ b/deps/v8/src/x64/stub-cache-x64.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -691,13 +691,9 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
                                       Register name_reg,
                                       Register scratch,
                                       Label* miss_label) {
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(receiver_reg, miss_label);
-
   // Check that the map of the object hasn't changed.
-  __ Cmp(FieldOperand(receiver_reg, HeapObject::kMapOffset),
-         Handle<Map>(object->map()));
-  __ j(not_equal, miss_label);
+  __ CheckMap(receiver_reg, Handle<Map>(object->map()),
+              miss_label, DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -864,12 +860,10 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
       if (in_new_space) {
         // Save the map in scratch1 for later.
         __ movq(scratch1, FieldOperand(reg, HeapObject::kMapOffset));
-        __ Cmp(scratch1, current_map);
-      } else {
-        __ Cmp(FieldOperand(reg, HeapObject::kMapOffset), current_map);
       }
-      // Branch on the result of the map check.
-      __ j(not_equal, miss);
+      __ CheckMap(reg, Handle<Map>(current_map),
+                  miss, DONT_DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
+
       // Check access rights to the global object.  This has to happen after
       // the map check so that we know that the object is actually a global
       // object.
@@ -901,8 +895,8 @@ Register StubCompiler::CheckPrototypes(Handle<JSObject> object,
   LOG(isolate(), IntEvent("check-maps-depth", depth + 1));
 
   // Check the holder map.
-  __ Cmp(FieldOperand(reg, HeapObject::kMapOffset), Handle<Map>(holder->map()));
-  __ j(not_equal, miss);
+  __ CheckMap(reg, Handle<Map>(holder->map()),
+              miss, DONT_DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform security check for access to the global object.
   ASSERT(current->IsJSGlobalProxy() || !current->IsAccessCheckNeeded());
@@ -2187,7 +2181,7 @@ Handle<Code> CallStubCompiler::CompileCallGlobal(
     __ movq(Operand(rsp, (argc + 1) * kPointerSize), rdx);
   }
 
-  // Setup the context (function already in rdi).
+  // Set up the context (function already in rdi).
   __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
   // Jump to the cached code (tail call).
@@ -2251,13 +2245,9 @@ Handle<Code> StoreStubCompiler::CompileStoreCallback(
   // -----------------------------------
   Label miss;
 
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(rdx, &miss);
-
   // Check that the map of the object hasn't changed.
-  __ Cmp(FieldOperand(rdx, HeapObject::kMapOffset),
-         Handle<Map>(object->map()));
-  __ j(not_equal, &miss);
+  __ CheckMap(rdx, Handle<Map>(object->map()), &miss,
+              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
@@ -2301,13 +2291,9 @@ Handle<Code> StoreStubCompiler::CompileStoreInterceptor(
   // -----------------------------------
   Label miss;
 
-  // Check that the object isn't a smi.
-  __ JumpIfSmi(rdx, &miss);
-
   // Check that the map of the object hasn't changed.
-  __ Cmp(FieldOperand(rdx, HeapObject::kMapOffset),
-         Handle<Map>(receiver->map()));
-  __ j(not_equal, &miss);
+  __ CheckMap(rdx, Handle<Map>(receiver->map()), &miss,
+              DO_SMI_CHECK, ALLOW_ELEMENT_TRANSITION_MAPS);
 
   // Perform global security token check if needed.
   if (receiver->IsJSGlobalProxy()) {