Upgrade V8 to 3.6.6

1 files changed, 609 insertions, 542 deletions

diff --git a/deps/v8/src/mips/builtins-mips.cc b/deps/v8/src/mips/builtins-mips.cc
index d77230448..f89dca926 100644
--- a/deps/v8/src/mips/builtins-mips.cc
+++ b/deps/v8/src/mips/builtins-mips.cc
@@ -587,10 +587,11 @@ void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
   __ bind(&convert_argument);
   __ push(function);  // Preserve the function.
   __ IncrementCounter(counters->string_ctor_conversions(), 1, a3, t0);
-  __ EnterInternalFrame();
-  __ push(v0);
-  __ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);
-  __ LeaveInternalFrame();
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    __ push(v0);
+    __ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION);
+  }
   __ pop(function);
   __ mov(argument, v0);
   __ Branch(&argument_is_string);
@@ -606,10 +607,11 @@ void Builtins::Generate_StringConstructCode(MacroAssembler* masm) {
   // create a string wrapper.
   __ bind(&gc_required);
   __ IncrementCounter(counters->string_ctor_gc_required(), 1, a3, t0);
-  __ EnterInternalFrame();
-  __ push(argument);
-  __ CallRuntime(Runtime::kNewStringWrapper, 1);
-  __ LeaveInternalFrame();
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+    __ push(argument);
+    __ CallRuntime(Runtime::kNewStringWrapper, 1);
+  }
   __ Ret();
 }
 
@@ -622,13 +624,13 @@ void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
   //  -- sp[...]: constructor arguments
   // -----------------------------------
 
-  Label non_function_call;
+  Label slow, non_function_call;
   // Check that the function is not a smi.
   __ And(t0, a1, Operand(kSmiTagMask));
   __ Branch(&non_function_call, eq, t0, Operand(zero_reg));
   // Check that the function is a JSFunction.
   __ GetObjectType(a1, a2, a2);
-  __ Branch(&non_function_call, ne, a2, Operand(JS_FUNCTION_TYPE));
+  __ Branch(&slow, ne, a2, Operand(JS_FUNCTION_TYPE));
 
   // Jump to the function-specific construct stub.
   __ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
@@ -638,13 +640,21 @@ void Builtins::Generate_JSConstructCall(MacroAssembler* masm) {
 
   // a0: number of arguments
   // a1: called object
+  // a2: object type
+  Label do_call;
+  __ bind(&slow);
+  __ Branch(&non_function_call, ne, a2, Operand(JS_FUNCTION_PROXY_TYPE));
+  __ GetBuiltinEntry(a3, Builtins::CALL_FUNCTION_PROXY_AS_CONSTRUCTOR);
+  __ jmp(&do_call);
+
   __ bind(&non_function_call);
+  __ GetBuiltinEntry(a3, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
+  __ bind(&do_call);
   // CALL_NON_FUNCTION expects the non-function constructor as receiver
   // (instead of the original receiver from the call site). The receiver is
   // stack element argc.
   // Set expected number of arguments to zero (not changing a0).
   __ mov(a2, zero_reg);
-  __ GetBuiltinEntry(a3, Builtins::CALL_NON_FUNCTION_AS_CONSTRUCTOR);
   __ SetCallKind(t1, CALL_AS_METHOD);
   __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
           RelocInfo::CODE_TARGET);
@@ -667,331 +677,335 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
   // -----------------------------------
 
   // Enter a construct frame.
-  __ EnterConstructFrame();
+  {
+    FrameScope scope(masm, StackFrame::CONSTRUCT);
 
-  // Preserve the two incoming parameters on the stack.
-  __ sll(a0, a0, kSmiTagSize);  // Tag arguments count.
-  __ MultiPushReversed(a0.bit() | a1.bit());
+    // Preserve the two incoming parameters on the stack.
+    __ sll(a0, a0, kSmiTagSize);  // Tag arguments count.
+    __ MultiPushReversed(a0.bit() | a1.bit());
 
-  // Use t7 to hold undefined, which is used in several places below.
-  __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
+    // Use t7 to hold undefined, which is used in several places below.
+    __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
 
-  Label rt_call, allocated;
-  // Try to allocate the object without transitioning into C code. If any of the
-  // preconditions is not met, the code bails out to the runtime call.
-  if (FLAG_inline_new) {
-    Label undo_allocation;
+    Label rt_call, allocated;
+    // Try to allocate the object without transitioning into C code. If any of
+    // the preconditions is not met, the code bails out to the runtime call.
+    if (FLAG_inline_new) {
+      Label undo_allocation;
 #ifdef ENABLE_DEBUGGER_SUPPORT
-    ExternalReference debug_step_in_fp =
-        ExternalReference::debug_step_in_fp_address(isolate);
-    __ li(a2, Operand(debug_step_in_fp));
-    __ lw(a2, MemOperand(a2));
-    __ Branch(&rt_call, ne, a2, Operand(zero_reg));
+      ExternalReference debug_step_in_fp =
+          ExternalReference::debug_step_in_fp_address(isolate);
+      __ li(a2, Operand(debug_step_in_fp));
+      __ lw(a2, MemOperand(a2));
+      __ Branch(&rt_call, ne, a2, Operand(zero_reg));
 #endif
 
-    // Load the initial map and verify that it is in fact a map.
-    // a1: constructor function
-    __ lw(a2, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
-    __ And(t0, a2, Operand(kSmiTagMask));
-    __ Branch(&rt_call, eq, t0, Operand(zero_reg));
-    __ GetObjectType(a2, a3, t4);
-    __ Branch(&rt_call, ne, t4, Operand(MAP_TYPE));
+      // Load the initial map and verify that it is in fact a map.
+      // a1: constructor function
+      __ lw(a2, FieldMemOperand(a1, JSFunction::kPrototypeOrInitialMapOffset));
+      __ And(t0, a2, Operand(kSmiTagMask));
+      __ Branch(&rt_call, eq, t0, Operand(zero_reg));
+      __ GetObjectType(a2, a3, t4);
+      __ Branch(&rt_call, ne, t4, Operand(MAP_TYPE));
+
+      // Check that the constructor is not constructing a JSFunction (see
+      // comments in Runtime_NewObject in runtime.cc). In which case the
+      // initial map's instance type would be JS_FUNCTION_TYPE.
+      // a1: constructor function
+      // a2: initial map
+      __ lbu(a3, FieldMemOperand(a2, Map::kInstanceTypeOffset));
+      __ Branch(&rt_call, eq, a3, Operand(JS_FUNCTION_TYPE));
 
-    // Check that the constructor is not constructing a JSFunction (see comments
-    // in Runtime_NewObject in runtime.cc). In which case the initial map's
-    // instance type would be JS_FUNCTION_TYPE.
-    // a1: constructor function
-    // a2: initial map
-    __ lbu(a3, FieldMemOperand(a2, Map::kInstanceTypeOffset));
-    __ Branch(&rt_call, eq, a3, Operand(JS_FUNCTION_TYPE));
-
-    if (count_constructions) {
-      Label allocate;
-      // Decrease generous allocation count.
-      __ lw(a3, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
-      MemOperand constructor_count =
-         FieldMemOperand(a3, SharedFunctionInfo::kConstructionCountOffset);
-      __ lbu(t0, constructor_count);
-      __ Subu(t0, t0, Operand(1));
-      __ sb(t0, constructor_count);
-      __ Branch(&allocate, ne, t0, Operand(zero_reg));
-
-      __ Push(a1, a2);
-
-      __ push(a1);  // Constructor.
-      // The call will replace the stub, so the countdown is only done once.
-      __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
-
-      __ pop(a2);
-      __ pop(a1);
-
-      __ bind(&allocate);
-    }
-
-    // Now allocate the JSObject on the heap.
-    // a1: constructor function
-    // a2: initial map
-    __ lbu(a3, FieldMemOperand(a2, Map::kInstanceSizeOffset));
-    __ AllocateInNewSpace(a3, t4, t5, t6, &rt_call, SIZE_IN_WORDS);
-
-    // Allocated the JSObject, now initialize the fields. Map is set to initial
-    // map and properties and elements are set to empty fixed array.
-    // a1: constructor function
-    // a2: initial map
-    // a3: object size
-    // t4: JSObject (not tagged)
-    __ LoadRoot(t6, Heap::kEmptyFixedArrayRootIndex);
-    __ mov(t5, t4);
-    __ sw(a2, MemOperand(t5, JSObject::kMapOffset));
-    __ sw(t6, MemOperand(t5, JSObject::kPropertiesOffset));
-    __ sw(t6, MemOperand(t5, JSObject::kElementsOffset));
-    __ Addu(t5, t5, Operand(3*kPointerSize));
-    ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
-    ASSERT_EQ(1 * kPointerSize, JSObject::kPropertiesOffset);
-    ASSERT_EQ(2 * kPointerSize, JSObject::kElementsOffset);
-
-    // Fill all the in-object properties with appropriate filler.
-    // a1: constructor function
-    // a2: initial map
-    // a3: object size (in words)
-    // t4: JSObject (not tagged)
-    // t5: First in-object property of JSObject (not tagged)
-    __ sll(t0, a3, kPointerSizeLog2);
-    __ addu(t6, t4, t0);   // End of object.
-    ASSERT_EQ(3 * kPointerSize, JSObject::kHeaderSize);
-    { Label loop, entry;
       if (count_constructions) {
-        // To allow for truncation.
-        __ LoadRoot(t7, Heap::kOnePointerFillerMapRootIndex);
-      } else {
-        __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
+        Label allocate;
+        // Decrease generous allocation count.
+        __ lw(a3, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+        MemOperand constructor_count =
+           FieldMemOperand(a3, SharedFunctionInfo::kConstructionCountOffset);
+        __ lbu(t0, constructor_count);
+        __ Subu(t0, t0, Operand(1));
+        __ sb(t0, constructor_count);
+        __ Branch(&allocate, ne, t0, Operand(zero_reg));
+
+        __ Push(a1, a2);
+
+        __ push(a1);  // Constructor.
+        // The call will replace the stub, so the countdown is only done once.
+        __ CallRuntime(Runtime::kFinalizeInstanceSize, 1);
+
+        __ pop(a2);
+        __ pop(a1);
+
+        __ bind(&allocate);
       }
-      __ jmp(&entry);
-      __ bind(&loop);
-      __ sw(t7, MemOperand(t5, 0));
-      __ addiu(t5, t5, kPointerSize);
-      __ bind(&entry);
-      __ Branch(&loop, Uless, t5, Operand(t6));
-    }
 
-    // Add the object tag to make the JSObject real, so that we can continue and
-    // jump into the continuation code at any time from now on. Any failures
-    // need to undo the allocation, so that the heap is in a consistent state
-    // and verifiable.
-    __ Addu(t4, t4, Operand(kHeapObjectTag));
+      // Now allocate the JSObject on the heap.
+      // a1: constructor function
+      // a2: initial map
+      __ lbu(a3, FieldMemOperand(a2, Map::kInstanceSizeOffset));
+      __ AllocateInNewSpace(a3, t4, t5, t6, &rt_call, SIZE_IN_WORDS);
+
+      // Allocated the JSObject, now initialize the fields. Map is set to
+      // initial map and properties and elements are set to empty fixed array.
+      // a1: constructor function
+      // a2: initial map
+      // a3: object size
+      // t4: JSObject (not tagged)
+      __ LoadRoot(t6, Heap::kEmptyFixedArrayRootIndex);
+      __ mov(t5, t4);
+      __ sw(a2, MemOperand(t5, JSObject::kMapOffset));
+      __ sw(t6, MemOperand(t5, JSObject::kPropertiesOffset));
+      __ sw(t6, MemOperand(t5, JSObject::kElementsOffset));
+      __ Addu(t5, t5, Operand(3*kPointerSize));
+      ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
+      ASSERT_EQ(1 * kPointerSize, JSObject::kPropertiesOffset);
+      ASSERT_EQ(2 * kPointerSize, JSObject::kElementsOffset);
+
+      // Fill all the in-object properties with appropriate filler.
+      // a1: constructor function
+      // a2: initial map
+      // a3: object size (in words)
+      // t4: JSObject (not tagged)
+      // t5: First in-object property of JSObject (not tagged)
+      __ sll(t0, a3, kPointerSizeLog2);
+      __ addu(t6, t4, t0);   // End of object.
+      ASSERT_EQ(3 * kPointerSize, JSObject::kHeaderSize);
+      { Label loop, entry;
+        if (count_constructions) {
+          // To allow for truncation.
+          __ LoadRoot(t7, Heap::kOnePointerFillerMapRootIndex);
+        } else {
+          __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
+        }
+        __ jmp(&entry);
+        __ bind(&loop);
+        __ sw(t7, MemOperand(t5, 0));
+        __ addiu(t5, t5, kPointerSize);
+        __ bind(&entry);
+        __ Branch(&loop, Uless, t5, Operand(t6));
+      }
 
-    // Check if a non-empty properties array is needed. Continue with allocated
-    // object if not fall through to runtime call if it is.
-    // a1: constructor function
-    // t4: JSObject
-    // t5: start of next object (not tagged)
-    __ lbu(a3, FieldMemOperand(a2, Map::kUnusedPropertyFieldsOffset));
-    // The field instance sizes contains both pre-allocated property fields and
-    // in-object properties.
-    __ lw(a0, FieldMemOperand(a2, Map::kInstanceSizesOffset));
-    __ And(t6,
-           a0,
-           Operand(0x000000FF << Map::kPreAllocatedPropertyFieldsByte * 8));
-    __ srl(t0, t6, Map::kPreAllocatedPropertyFieldsByte * 8);
-    __ Addu(a3, a3, Operand(t0));
-    __ And(t6, a0, Operand(0x000000FF << Map::kInObjectPropertiesByte * 8));
-    __ srl(t0, t6, Map::kInObjectPropertiesByte * 8);
-    __ subu(a3, a3, t0);
-
-    // Done if no extra properties are to be allocated.
-    __ Branch(&allocated, eq, a3, Operand(zero_reg));
-    __ Assert(greater_equal, "Property allocation count failed.",
-        a3, Operand(zero_reg));
-
-    // Scale the number of elements by pointer size and add the header for
-    // FixedArrays to the start of the next object calculation from above.
-    // a1: constructor
-    // a3: number of elements in properties array
-    // t4: JSObject
-    // t5: start of next object
-    __ Addu(a0, a3, Operand(FixedArray::kHeaderSize / kPointerSize));
-    __ AllocateInNewSpace(
-        a0,
-        t5,
-        t6,
-        a2,
-        &undo_allocation,
-        static_cast<AllocationFlags>(RESULT_CONTAINS_TOP | SIZE_IN_WORDS));
-
-    // Initialize the FixedArray.
-    // a1: constructor
-    // a3: number of elements in properties array (un-tagged)
-    // t4: JSObject
-    // t5: start of next object
-    __ LoadRoot(t6, Heap::kFixedArrayMapRootIndex);
-    __ mov(a2, t5);
-    __ sw(t6, MemOperand(a2, JSObject::kMapOffset));
-    __ sll(a0, a3, kSmiTagSize);
-    __ sw(a0, MemOperand(a2, FixedArray::kLengthOffset));
-    __ Addu(a2, a2, Operand(2 * kPointerSize));
-
-    ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
-    ASSERT_EQ(1 * kPointerSize, FixedArray::kLengthOffset);
-
-    // Initialize the fields to undefined.
-    // a1: constructor
-    // a2: First element of FixedArray (not tagged)
-    // a3: number of elements in properties array
-    // t4: JSObject
-    // t5: FixedArray (not tagged)
-    __ sll(t3, a3, kPointerSizeLog2);
-    __ addu(t6, a2, t3);  // End of object.
-    ASSERT_EQ(2 * kPointerSize, FixedArray::kHeaderSize);
-    { Label loop, entry;
-      if (count_constructions) {
-        __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
-      } else if (FLAG_debug_code) {
-        __ LoadRoot(t8, Heap::kUndefinedValueRootIndex);
-        __ Assert(eq, "Undefined value not loaded.", t7, Operand(t8));
+      // Add the object tag to make the JSObject real, so that we can continue
+      // and jump into the continuation code at any time from now on. Any
+      // failures need to undo the allocation, so that the heap is in a
+      // consistent state and verifiable.
+      __ Addu(t4, t4, Operand(kHeapObjectTag));
+
+      // Check if a non-empty properties array is needed. Continue with
+      // allocated object if not fall through to runtime call if it is.
+      // a1: constructor function
+      // t4: JSObject
+      // t5: start of next object (not tagged)
+      __ lbu(a3, FieldMemOperand(a2, Map::kUnusedPropertyFieldsOffset));
+      // The field instance sizes contains both pre-allocated property fields
+      // and in-object properties.
+      __ lw(a0, FieldMemOperand(a2, Map::kInstanceSizesOffset));
+      __ And(t6,
+             a0,
+             Operand(0x000000FF << Map::kPreAllocatedPropertyFieldsByte * 8));
+      __ srl(t0, t6, Map::kPreAllocatedPropertyFieldsByte * 8);
+      __ Addu(a3, a3, Operand(t0));
+      __ And(t6, a0, Operand(0x000000FF << Map::kInObjectPropertiesByte * 8));
+      __ srl(t0, t6, Map::kInObjectPropertiesByte * 8);
+      __ subu(a3, a3, t0);
+
+      // Done if no extra properties are to be allocated.
+      __ Branch(&allocated, eq, a3, Operand(zero_reg));
+      __ Assert(greater_equal, "Property allocation count failed.",
+          a3, Operand(zero_reg));
+
+      // Scale the number of elements by pointer size and add the header for
+      // FixedArrays to the start of the next object calculation from above.
+      // a1: constructor
+      // a3: number of elements in properties array
+      // t4: JSObject
+      // t5: start of next object
+      __ Addu(a0, a3, Operand(FixedArray::kHeaderSize / kPointerSize));
+      __ AllocateInNewSpace(
+          a0,
+          t5,
+          t6,
+          a2,
+          &undo_allocation,
+          static_cast<AllocationFlags>(RESULT_CONTAINS_TOP | SIZE_IN_WORDS));
+
+      // Initialize the FixedArray.
+      // a1: constructor
+      // a3: number of elements in properties array (un-tagged)
+      // t4: JSObject
+      // t5: start of next object
+      __ LoadRoot(t6, Heap::kFixedArrayMapRootIndex);
+      __ mov(a2, t5);
+      __ sw(t6, MemOperand(a2, JSObject::kMapOffset));
+      __ sll(a0, a3, kSmiTagSize);
+      __ sw(a0, MemOperand(a2, FixedArray::kLengthOffset));
+      __ Addu(a2, a2, Operand(2 * kPointerSize));
+
+      ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset);
+      ASSERT_EQ(1 * kPointerSize, FixedArray::kLengthOffset);
+
+      // Initialize the fields to undefined.
+      // a1: constructor
+      // a2: First element of FixedArray (not tagged)
+      // a3: number of elements in properties array
+      // t4: JSObject
+      // t5: FixedArray (not tagged)
+      __ sll(t3, a3, kPointerSizeLog2);
+      __ addu(t6, a2, t3);  // End of object.
+      ASSERT_EQ(2 * kPointerSize, FixedArray::kHeaderSize);
+      { Label loop, entry;
+        if (count_constructions) {
+          __ LoadRoot(t7, Heap::kUndefinedValueRootIndex);
+        } else if (FLAG_debug_code) {
+          __ LoadRoot(t8, Heap::kUndefinedValueRootIndex);
+          __ Assert(eq, "Undefined value not loaded.", t7, Operand(t8));
+        }
+        __ jmp(&entry);
+        __ bind(&loop);
+        __ sw(t7, MemOperand(a2));
+        __ addiu(a2, a2, kPointerSize);
+        __ bind(&entry);
+        __ Branch(&loop, less, a2, Operand(t6));
       }
-      __ jmp(&entry);
-      __ bind(&loop);
-      __ sw(t7, MemOperand(a2));
-      __ addiu(a2, a2, kPointerSize);
-      __ bind(&entry);
-      __ Branch(&loop, less, a2, Operand(t6));
+
+      // Store the initialized FixedArray into the properties field of
+      // the JSObject.
+      // a1: constructor function
+      // t4: JSObject
+      // t5: FixedArray (not tagged)
+      __ Addu(t5, t5, Operand(kHeapObjectTag));  // Add the heap tag.
+      __ sw(t5, FieldMemOperand(t4, JSObject::kPropertiesOffset));
+
+      // Continue with JSObject being successfully allocated.
+      // a1: constructor function
+      // a4: JSObject
+      __ jmp(&allocated);
+
+      // Undo the setting of the new top so that the heap is verifiable. For
+      // example, the map's unused properties potentially do not match the
+      // allocated objects unused properties.
+      // t4: JSObject (previous new top)
+      __ bind(&undo_allocation);
+      __ UndoAllocationInNewSpace(t4, t5);
     }
 
-    // Store the initialized FixedArray into the properties field of
-    // the JSObject.
+    __ bind(&rt_call);
+    // Allocate the new receiver object using the runtime call.
     // a1: constructor function
-    // t4: JSObject
-    // t5: FixedArray (not tagged)
-    __ Addu(t5, t5, Operand(kHeapObjectTag));  // Add the heap tag.
-    __ sw(t5, FieldMemOperand(t4, JSObject::kPropertiesOffset));
+    __ push(a1);  // Argument for Runtime_NewObject.
+    __ CallRuntime(Runtime::kNewObject, 1);
+    __ mov(t4, v0);
 
-    // Continue with JSObject being successfully allocated.
-    // a1: constructor function
-    // a4: JSObject
-    __ jmp(&allocated);
-
-    // Undo the setting of the new top so that the heap is verifiable. For
-    // example, the map's unused properties potentially do not match the
-    // allocated objects unused properties.
-    // t4: JSObject (previous new top)
-    __ bind(&undo_allocation);
-    __ UndoAllocationInNewSpace(t4, t5);
-  }
+    // Receiver for constructor call allocated.
+    // t4: JSObject
+    __ bind(&allocated);
+    __ push(t4);
 
-  __ bind(&rt_call);
-  // Allocate the new receiver object using the runtime call.
-  // a1: constructor function
-  __ push(a1);  // Argument for Runtime_NewObject.
-  __ CallRuntime(Runtime::kNewObject, 1);
-  __ mov(t4, v0);
+    // Push the function and the allocated receiver from the stack.
+    // sp[0]: receiver (newly allocated object)
+    // sp[1]: constructor function
+    // sp[2]: number of arguments (smi-tagged)
+    __ lw(a1, MemOperand(sp, kPointerSize));
+    __ MultiPushReversed(a1.bit() | t4.bit());
 
-  // Receiver for constructor call allocated.
-  // t4: JSObject
-  __ bind(&allocated);
-  __ push(t4);
+    // Reload the number of arguments from the stack.
+    // a1: constructor function
+    // sp[0]: receiver
+    // sp[1]: constructor function
+    // sp[2]: receiver
+    // sp[3]: constructor function
+    // sp[4]: number of arguments (smi-tagged)
+    __ lw(a3, MemOperand(sp, 4 * kPointerSize));
 
-  // Push the function and the allocated receiver from the stack.
-  // sp[0]: receiver (newly allocated object)
-  // sp[1]: constructor function
-  // sp[2]: number of arguments (smi-tagged)
-  __ lw(a1, MemOperand(sp, kPointerSize));
-  __ MultiPushReversed(a1.bit() | t4.bit());
+    // Setup pointer to last argument.
+    __ Addu(a2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
 
-  // Reload the number of arguments from the stack.
-  // a1: constructor function
-  // sp[0]: receiver
-  // sp[1]: constructor function
-  // sp[2]: receiver
-  // sp[3]: constructor function
-  // sp[4]: number of arguments (smi-tagged)
-  __ lw(a3, MemOperand(sp, 4 * kPointerSize));
+    // Setup number of arguments for function call below.
+    __ srl(a0, a3, kSmiTagSize);
 
-  // Setup pointer to last argument.
-  __ Addu(a2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
+    // Copy arguments and receiver to the expression stack.
+    // a0: number of arguments
+    // a1: constructor function
+    // a2: address of last argument (caller sp)
+    // a3: number of arguments (smi-tagged)
+    // sp[0]: receiver
+    // sp[1]: constructor function
+    // sp[2]: receiver
+    // sp[3]: constructor function
+    // sp[4]: number of arguments (smi-tagged)
+    Label loop, entry;
+    __ jmp(&entry);
+    __ bind(&loop);
+    __ sll(t0, a3, kPointerSizeLog2 - kSmiTagSize);
+    __ Addu(t0, a2, Operand(t0));
+    __ lw(t1, MemOperand(t0));
+    __ push(t1);
+    __ bind(&entry);
+    __ Addu(a3, a3, Operand(-2));
+    __ Branch(&loop, greater_equal, a3, Operand(zero_reg));
 
-  // Setup number of arguments for function call below.
-  __ srl(a0, a3, kSmiTagSize);
+    // Call the function.
+    // a0: number of arguments
+    // a1: constructor function
+    if (is_api_function) {
+      __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+      Handle<Code> code =
+          masm->isolate()->builtins()->HandleApiCallConstruct();
+      ParameterCount expected(0);
+      __ InvokeCode(code, expected, expected,
+                    RelocInfo::CODE_TARGET, CALL_FUNCTION, CALL_AS_METHOD);
+    } else {
+      ParameterCount actual(a0);
+      __ InvokeFunction(a1, actual, CALL_FUNCTION,
+                        NullCallWrapper(), CALL_AS_METHOD);
+    }
 
-  // Copy arguments and receiver to the expression stack.
-  // a0: number of arguments
-  // a1: constructor function
-  // a2: address of last argument (caller sp)
-  // a3: number of arguments (smi-tagged)
-  // sp[0]: receiver
-  // sp[1]: constructor function
-  // sp[2]: receiver
-  // sp[3]: constructor function
-  // sp[4]: number of arguments (smi-tagged)
-  Label loop, entry;
-  __ jmp(&entry);
-  __ bind(&loop);
-  __ sll(t0, a3, kPointerSizeLog2 - kSmiTagSize);
-  __ Addu(t0, a2, Operand(t0));
-  __ lw(t1, MemOperand(t0));
-  __ push(t1);
-  __ bind(&entry);
-  __ Addu(a3, a3, Operand(-2));
-  __ Branch(&loop, greater_equal, a3, Operand(zero_reg));
+    // Pop the function from the stack.
+    // v0: result
+    // sp[0]: constructor function
+    // sp[2]: receiver
+    // sp[3]: constructor function
+    // sp[4]: number of arguments (smi-tagged)
+    __ Pop();
 
-  // Call the function.
-  // a0: number of arguments
-  // a1: constructor function
-  if (is_api_function) {
-    __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
-    Handle<Code> code =
-        masm->isolate()->builtins()->HandleApiCallConstruct();
-    ParameterCount expected(0);
-    __ InvokeCode(code, expected, expected,
-                  RelocInfo::CODE_TARGET, CALL_FUNCTION, CALL_AS_METHOD);
-  } else {
-    ParameterCount actual(a0);
-    __ InvokeFunction(a1, actual, CALL_FUNCTION,
-                      NullCallWrapper(), CALL_AS_METHOD);
+    // Restore context from the frame.
+    __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+
+    // If the result is an object (in the ECMA sense), we should get rid
+    // of the receiver and use the result; see ECMA-262 section 13.2.2-7
+    // on page 74.
+    Label use_receiver, exit;
+
+    // If the result is a smi, it is *not* an object in the ECMA sense.
+    // v0: result
+    // sp[0]: receiver (newly allocated object)
+    // sp[1]: constructor function
+    // sp[2]: number of arguments (smi-tagged)
+    __ And(t0, v0, Operand(kSmiTagMask));
+    __ Branch(&use_receiver, eq, t0, Operand(zero_reg));
+
+    // If the type of the result (stored in its map) is less than
+    // FIRST_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense.
+    __ GetObjectType(v0, a3, a3);
+    __ Branch(&exit, greater_equal, a3, Operand(FIRST_SPEC_OBJECT_TYPE));
+
+    // Throw away the result of the constructor invocation and use the
+    // on-stack receiver as the result.
+    __ bind(&use_receiver);
+    __ lw(v0, MemOperand(sp));
+
+    // Remove receiver from the stack, remove caller arguments, and
+    // return.
+    __ bind(&exit);
+    // v0: result
+    // sp[0]: receiver (newly allocated object)
+    // sp[1]: constructor function
+    // sp[2]: number of arguments (smi-tagged)
+    __ lw(a1, MemOperand(sp, 2 * kPointerSize));
+
+    // Leave construct frame.
   }
 
-  // Pop the function from the stack.
-  // v0: result
-  // sp[0]: constructor function
-  // sp[2]: receiver
-  // sp[3]: constructor function
-  // sp[4]: number of arguments (smi-tagged)
-  __ Pop();
-
-  // Restore context from the frame.
-  __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
-
-  // If the result is an object (in the ECMA sense), we should get rid
-  // of the receiver and use the result; see ECMA-262 section 13.2.2-7
-  // on page 74.
-  Label use_receiver, exit;
-
-  // If the result is a smi, it is *not* an object in the ECMA sense.
-  // v0: result
-  // sp[0]: receiver (newly allocated object)
-  // sp[1]: constructor function
-  // sp[2]: number of arguments (smi-tagged)
-  __ And(t0, v0, Operand(kSmiTagMask));
-  __ Branch(&use_receiver, eq, t0, Operand(zero_reg));
-
-  // If the type of the result (stored in its map) is less than
-  // FIRST_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense.
-  __ GetObjectType(v0, a3, a3);
-  __ Branch(&exit, greater_equal, a3, Operand(FIRST_SPEC_OBJECT_TYPE));
-
-  // Throw away the result of the constructor invocation and use the
-  // on-stack receiver as the result.
-  __ bind(&use_receiver);
-  __ lw(v0, MemOperand(sp));
-
-  // Remove receiver from the stack, remove caller arguments, and
-  // return.
-  __ bind(&exit);
-  // v0: result
-  // sp[0]: receiver (newly allocated object)
-  // sp[1]: constructor function
-  // sp[2]: number of arguments (smi-tagged)
-  __ lw(a1, MemOperand(sp, 2 * kPointerSize));
-  __ LeaveConstructFrame();
   __ sll(t0, a1, kPointerSizeLog2 - 1);
   __ Addu(sp, sp, t0);
   __ Addu(sp, sp, kPointerSize);
@@ -1031,58 +1045,60 @@ static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
   __ mov(cp, zero_reg);
 
   // Enter an internal frame.
-  __ EnterInternalFrame();
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
 
-  // Set up the context from the function argument.
-  __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+    // Set up the context from the function argument.
+    __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
 
-  // Set up the roots register.
-  ExternalReference roots_address =
-      ExternalReference::roots_address(masm->isolate());
-  __ li(s6, Operand(roots_address));
+    // Set up the roots register.
+    ExternalReference roots_address =
+        ExternalReference::roots_address(masm->isolate());
+    __ li(s6, Operand(roots_address));
 
-  // Push the function and the receiver onto the stack.
-  __ Push(a1, a2);
+    // Push the function and the receiver onto the stack.
+    __ Push(a1, a2);
 
-  // Copy arguments to the stack in a loop.
-  // a3: argc
-  // s0: argv, ie points to first arg
-  Label loop, entry;
-  __ sll(t0, a3, kPointerSizeLog2);
-  __ addu(t2, s0, t0);
-  __ b(&entry);
-  __ nop();   // Branch delay slot nop.
-  // t2 points past last arg.
-  __ bind(&loop);
-  __ lw(t0, MemOperand(s0));  // Read next parameter.
-  __ addiu(s0, s0, kPointerSize);
-  __ lw(t0, MemOperand(t0));  // Dereference handle.
-  __ push(t0);  // Push parameter.
-  __ bind(&entry);
-  __ Branch(&loop, ne, s0, Operand(t2));
-
-  // Initialize all JavaScript callee-saved registers, since they will be seen
-  // by the garbage collector as part of handlers.
-  __ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
-  __ mov(s1, t0);
-  __ mov(s2, t0);
-  __ mov(s3, t0);
-  __ mov(s4, t0);
-  __ mov(s5, t0);
-  // s6 holds the root address. Do not clobber.
-  // s7 is cp. Do not init.
-
-  // Invoke the code and pass argc as a0.
-  __ mov(a0, a3);
-  if (is_construct) {
-    __ Call(masm->isolate()->builtins()->JSConstructCall());
-  } else {
-    ParameterCount actual(a0);
-    __ InvokeFunction(a1, actual, CALL_FUNCTION,
-                      NullCallWrapper(), CALL_AS_METHOD);
-  }
+    // Copy arguments to the stack in a loop.
+    // a3: argc
+    // s0: argv, ie points to first arg
+    Label loop, entry;
+    __ sll(t0, a3, kPointerSizeLog2);
+    __ addu(t2, s0, t0);
+    __ b(&entry);
+    __ nop();   // Branch delay slot nop.
+    // t2 points past last arg.
+    __ bind(&loop);
+    __ lw(t0, MemOperand(s0));  // Read next parameter.
+    __ addiu(s0, s0, kPointerSize);
+    __ lw(t0, MemOperand(t0));  // Dereference handle.
+    __ push(t0);  // Push parameter.
+    __ bind(&entry);
+    __ Branch(&loop, ne, s0, Operand(t2));
 
-  __ LeaveInternalFrame();
+    // Initialize all JavaScript callee-saved registers, since they will be seen
+    // by the garbage collector as part of handlers.
+    __ LoadRoot(t0, Heap::kUndefinedValueRootIndex);
+    __ mov(s1, t0);
+    __ mov(s2, t0);
+    __ mov(s3, t0);
+    __ mov(s4, t0);
+    __ mov(s5, t0);
+    // s6 holds the root address. Do not clobber.
+    // s7 is cp. Do not init.
+
+    // Invoke the code and pass argc as a0.
+    __ mov(a0, a3);
+    if (is_construct) {
+      __ Call(masm->isolate()->builtins()->JSConstructCall());
+    } else {
+      ParameterCount actual(a0);
+      __ InvokeFunction(a1, actual, CALL_FUNCTION,
+                        NullCallWrapper(), CALL_AS_METHOD);
+    }
+
+    // Leave internal frame.
+  }
 
   __ Jump(ra);
 }
@@ -1100,27 +1116,28 @@ void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) {
 
 void Builtins::Generate_LazyCompile(MacroAssembler* masm) {
   // Enter an internal frame.
-  __ EnterInternalFrame();
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
 
-  // Preserve the function.
-  __ push(a1);
-  // Push call kind information.
-  __ push(t1);
+    // Preserve the function.
+    __ push(a1);
+    // Push call kind information.
+    __ push(t1);
 
-  // Push the function on the stack as the argument to the runtime function.
-  __ push(a1);
-  // Call the runtime function.
-  __ CallRuntime(Runtime::kLazyCompile, 1);
-  // Calculate the entry point.
-  __ addiu(t9, v0, Code::kHeaderSize - kHeapObjectTag);
+    // Push the function on the stack as the argument to the runtime function.
+    __ push(a1);
+    // Call the runtime function.
+    __ CallRuntime(Runtime::kLazyCompile, 1);
+    // Calculate the entry point.
+    __ addiu(t9, v0, Code::kHeaderSize - kHeapObjectTag);
 
-  // Restore call kind information.
-  __ pop(t1);
-  // Restore saved function.
-  __ pop(a1);
+    // Restore call kind information.
+    __ pop(t1);
+    // Restore saved function.
+    __ pop(a1);
 
-  // Tear down temporary frame.
-  __ LeaveInternalFrame();
+    // Tear down temporary frame.
+  }
 
   // Do a tail-call of the compiled function.
   __ Jump(t9);
@@ -1129,26 +1146,27 @@ void Builtins::Generate_LazyCompile(MacroAssembler* masm) {
 
 void Builtins::Generate_LazyRecompile(MacroAssembler* masm) {
   // Enter an internal frame.
-  __ EnterInternalFrame();
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
 
-  // Preserve the function.
-  __ push(a1);
-  // Push call kind information.
-  __ push(t1);
+    // Preserve the function.
+    __ push(a1);
+    // Push call kind information.
+    __ push(t1);
 
-  // Push the function on the stack as the argument to the runtime function.
-  __ push(a1);
-  __ CallRuntime(Runtime::kLazyRecompile, 1);
-  // Calculate the entry point.
-  __ Addu(t9, v0, Operand(Code::kHeaderSize - kHeapObjectTag));
+    // Push the function on the stack as the argument to the runtime function.
+    __ push(a1);
+    __ CallRuntime(Runtime::kLazyRecompile, 1);
+    // Calculate the entry point.
+    __ Addu(t9, v0, Operand(Code::kHeaderSize - kHeapObjectTag));
 
-  // Restore call kind information.
-  __ pop(t1);
-  // Restore saved function.
-  __ pop(a1);
+    // Restore call kind information.
+    __ pop(t1);
+    // Restore saved function.
+    __ pop(a1);
 
-  // Tear down temporary frame.
-  __ LeaveInternalFrame();
+    // Tear down temporary frame.
+  }
 
   // Do a tail-call of the compiled function.
   __ Jump(t9);
@@ -1190,19 +1208,20 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
   // 2. Get the function to call (passed as receiver) from the stack, check
   //    if it is a function.
   // a0: actual number of arguments
-  Label non_function;
+  Label slow, non_function;
   __ sll(at, a0, kPointerSizeLog2);
   __ addu(at, sp, at);
   __ lw(a1, MemOperand(at));
   __ And(at, a1, Operand(kSmiTagMask));
   __ Branch(&non_function, eq, at, Operand(zero_reg));
   __ GetObjectType(a1, a2, a2);
-  __ Branch(&non_function, ne, a2, Operand(JS_FUNCTION_TYPE));
+  __ Branch(&slow, ne, a2, Operand(JS_FUNCTION_TYPE));
 
   // 3a. Patch the first argument if necessary when calling a function.
   // a0: actual number of arguments
   // a1: function
   Label shift_arguments;
+  __ li(t0, Operand(0, RelocInfo::NONE));  // Indicate regular JS_FUNCTION.
   { Label convert_to_object, use_global_receiver, patch_receiver;
     // Change context eagerly in case we need the global receiver.
     __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
@@ -1210,13 +1229,13 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     // Do not transform the receiver for strict mode functions.
     __ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
     __ lw(a3, FieldMemOperand(a2, SharedFunctionInfo::kCompilerHintsOffset));
-    __ And(t0, a3, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
+    __ And(t3, a3, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
                                  kSmiTagSize)));
-    __ Branch(&shift_arguments, ne, t0, Operand(zero_reg));
+    __ Branch(&shift_arguments, ne, t3, Operand(zero_reg));
 
     // Do not transform the receiver for native (Compilerhints already in a3).
-    __ And(t0, a3, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
-    __ Branch(&shift_arguments, ne, t0, Operand(zero_reg));
+    __ And(t3, a3, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
+    __ Branch(&shift_arguments, ne, t3, Operand(zero_reg));
 
     // Compute the receiver in non-strict mode.
     // Load first argument in a2. a2 = -kPointerSize(sp + n_args << 2).
@@ -1238,21 +1257,25 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     __ Branch(&shift_arguments, ge, a3, Operand(FIRST_SPEC_OBJECT_TYPE));
 
     __ bind(&convert_to_object);
-    __ EnterInternalFrame();  // In order to preserve argument count.
-    __ sll(a0, a0, kSmiTagSize);  // Smi tagged.
-    __ push(a0);
-
-    __ push(a2);
-    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-    __ mov(a2, v0);
-
-    __ pop(a0);
-    __ sra(a0, a0, kSmiTagSize);  // Un-tag.
-    __ LeaveInternalFrame();
-    // Restore the function to a1.
+    // Enter an internal frame in order to preserve argument count.
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
+      __ sll(a0, a0, kSmiTagSize);  // Smi tagged.
+      __ push(a0);
+
+      __ push(a2);
+      __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+      __ mov(a2, v0);
+
+      __ pop(a0);
+      __ sra(a0, a0, kSmiTagSize);  // Un-tag.
+      // Leave internal frame.
+    }
+    // Restore the function to a1, and the flag to t0.
     __ sll(at, a0, kPointerSizeLog2);
     __ addu(at, sp, at);
     __ lw(a1, MemOperand(at));
+    __ li(t0, Operand(0, RelocInfo::NONE));
     __ Branch(&patch_receiver);
 
     // Use the global receiver object from the called function as the
@@ -1273,25 +1296,31 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     __ Branch(&shift_arguments);
   }
 
-  // 3b. Patch the first argument when calling a non-function.  The
+  // 3b. Check for function proxy.
+  __ bind(&slow);
+  __ li(t0, Operand(1, RelocInfo::NONE));  // Indicate function proxy.
+  __ Branch(&shift_arguments, eq, a2, Operand(JS_FUNCTION_PROXY_TYPE));
+
+  __ bind(&non_function);
+  __ li(t0, Operand(2, RelocInfo::NONE));  // Indicate non-function.
+
+  // 3c. Patch the first argument when calling a non-function.  The
   //     CALL_NON_FUNCTION builtin expects the non-function callee as
   //     receiver, so overwrite the first argument which will ultimately
   //     become the receiver.
   // a0: actual number of arguments
   // a1: function
-  __ bind(&non_function);
-  // Restore the function in case it has been modified.
+  // t0: call type (0: JS function, 1: function proxy, 2: non-function)
   __ sll(at, a0, kPointerSizeLog2);
   __ addu(a2, sp, at);
   __ sw(a1, MemOperand(a2, -kPointerSize));
-  // Clear a1 to indicate a non-function being called.
-  __ mov(a1, zero_reg);
 
   // 4. Shift arguments and return address one slot down on the stack
   //    (overwriting the original receiver).  Adjust argument count to make
   //    the original first argument the new receiver.
   // a0: actual number of arguments
   // a1: function
+  // t0: call type (0: JS function, 1: function proxy, 2: non-function)
   __ bind(&shift_arguments);
   { Label loop;
     // Calculate the copy start address (destination). Copy end address is sp.
@@ -1309,14 +1338,26 @@ void Builtins::Generate_FunctionCall(MacroAssembler* masm) {
     __ Pop();
   }
 
-  // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin.
+  // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin,
+  //     or a function proxy via CALL_FUNCTION_PROXY.
   // a0: actual number of arguments
   // a1: function
-  { Label function;
-    __ Branch(&function, ne, a1, Operand(zero_reg));
-    __ mov(a2, zero_reg);  // expected arguments is 0 for CALL_NON_FUNCTION
-    __ GetBuiltinEntry(a3, Builtins::CALL_NON_FUNCTION);
+  // t0: call type (0: JS function, 1: function proxy, 2: non-function)
+  { Label function, non_proxy;
+    __ Branch(&function, eq, t0, Operand(zero_reg));
+    // Expected number of arguments is 0 for CALL_NON_FUNCTION.
+    __ mov(a2, zero_reg);
     __ SetCallKind(t1, CALL_AS_METHOD);
+    __ Branch(&non_proxy, ne, t0, Operand(1));
+
+    __ push(a1);  // Re-add proxy object as additional argument.
+    __ Addu(a0, a0, Operand(1));
+    __ GetBuiltinEntry(a3, Builtins::CALL_FUNCTION_PROXY);
+    __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+            RelocInfo::CODE_TARGET);
+
+    __ bind(&non_proxy);
+    __ GetBuiltinEntry(a3, Builtins::CALL_NON_FUNCTION);
     __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
             RelocInfo::CODE_TARGET);
     __ bind(&function);
@@ -1350,134 +1391,160 @@ void Builtins::Generate_FunctionApply(MacroAssembler* masm) {
   const int kRecvOffset     =  3 * kPointerSize;
   const int kFunctionOffset =  4 * kPointerSize;
 
-  __ EnterInternalFrame();
-
-  __ lw(a0, MemOperand(fp, kFunctionOffset));  // Get the function.
-  __ push(a0);
-  __ lw(a0, MemOperand(fp, kArgsOffset));  // Get the args array.
-  __ push(a0);
-  // Returns (in v0) number of arguments to copy to stack as Smi.
-  __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
-
-  // Check the stack for overflow. We are not trying need to catch
-  // interruptions (e.g. debug break and preemption) here, so the "real stack
-  // limit" is checked.
-  Label okay;
-  __ LoadRoot(a2, Heap::kRealStackLimitRootIndex);
-  // Make a2 the space we have left. The stack might already be overflowed
-  // here which will cause a2 to become negative.
-  __ subu(a2, sp, a2);
-  // Check if the arguments will overflow the stack.
-  __ sll(t0, v0, kPointerSizeLog2 - kSmiTagSize);
-  __ Branch(&okay, gt, a2, Operand(t0));  // Signed comparison.
-
-  // Out of stack space.
-  __ lw(a1, MemOperand(fp, kFunctionOffset));
-  __ push(a1);
-  __ push(v0);
-  __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);
-  // End of stack check.
-
-  // Push current limit and index.
-  __ bind(&okay);
-  __ push(v0);  // Limit.
-  __ mov(a1, zero_reg);  // Initial index.
-  __ push(a1);
-
-  // Change context eagerly to get the right global object if necessary.
-  __ lw(a0, MemOperand(fp, kFunctionOffset));
-  __ lw(cp, FieldMemOperand(a0, JSFunction::kContextOffset));
-  // Load the shared function info while the function is still in a0.
-  __ lw(a1, FieldMemOperand(a0, JSFunction::kSharedFunctionInfoOffset));
-
-  // Compute the receiver.
-  Label call_to_object, use_global_receiver, push_receiver;
-  __ lw(a0, MemOperand(fp, kRecvOffset));
-
-  // Do not transform the receiver for strict mode functions.
-  __ lw(a2, FieldMemOperand(a1, SharedFunctionInfo::kCompilerHintsOffset));
-  __ And(t0, a2, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
-                               kSmiTagSize)));
-  __ Branch(&push_receiver, ne, t0, Operand(zero_reg));
-
-  // Do not transform the receiver for native (Compilerhints already in a2).
-  __ And(t0, a2, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
-  __ Branch(&push_receiver, ne, t0, Operand(zero_reg));
-
-  // Compute the receiver in non-strict mode.
-  __ And(t0, a0, Operand(kSmiTagMask));
-  __ Branch(&call_to_object, eq, t0, Operand(zero_reg));
-  __ LoadRoot(a1, Heap::kNullValueRootIndex);
-  __ Branch(&use_global_receiver, eq, a0, Operand(a1));
-  __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
-  __ Branch(&use_global_receiver, eq, a0, Operand(a2));
-
-  // Check if the receiver is already a JavaScript object.
-  // a0: receiver
-  STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
-  __ GetObjectType(a0, a1, a1);
-  __ Branch(&push_receiver, ge, a1, Operand(FIRST_SPEC_OBJECT_TYPE));
-
-  // Convert the receiver to a regular object.
-  // a0: receiver
-  __ bind(&call_to_object);
-  __ push(a0);
-  __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
-  __ mov(a0, v0);  // Put object in a0 to match other paths to push_receiver.
-  __ Branch(&push_receiver);
-
-  // Use the current global receiver object as the receiver.
-  __ bind(&use_global_receiver);
-  const int kGlobalOffset =
-      Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
-  __ lw(a0, FieldMemOperand(cp, kGlobalOffset));
-  __ lw(a0, FieldMemOperand(a0, GlobalObject::kGlobalContextOffset));
-  __ lw(a0, FieldMemOperand(a0, kGlobalOffset));
-  __ lw(a0, FieldMemOperand(a0, GlobalObject::kGlobalReceiverOffset));
-
-  // Push the receiver.
-  // a0: receiver
-  __ bind(&push_receiver);
-  __ push(a0);
-
-  // Copy all arguments from the array to the stack.
-  Label entry, loop;
-  __ lw(a0, MemOperand(fp, kIndexOffset));
-  __ Branch(&entry);
+  {
+    FrameScope frame_scope(masm, StackFrame::INTERNAL);
+    __ lw(a0, MemOperand(fp, kFunctionOffset));  // Get the function.
+    __ push(a0);
+    __ lw(a0, MemOperand(fp, kArgsOffset));  // Get the args array.
+    __ push(a0);
+    // Returns (in v0) number of arguments to copy to stack as Smi.
+    __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION);
+
+    // Check the stack for overflow. We are not trying to catch
+    // interruptions (e.g. debug break and preemption) here, so the "real stack
+    // limit" is checked.
+    Label okay;
+    __ LoadRoot(a2, Heap::kRealStackLimitRootIndex);
+    // Make a2 the space we have left. The stack might already be overflowed
+    // here which will cause a2 to become negative.
+    __ subu(a2, sp, a2);
+    // Check if the arguments will overflow the stack.
+    __ sll(t3, v0, kPointerSizeLog2 - kSmiTagSize);
+    __ Branch(&okay, gt, a2, Operand(t3));  // Signed comparison.
+
+    // Out of stack space.
+    __ lw(a1, MemOperand(fp, kFunctionOffset));
+    __ push(a1);
+    __ push(v0);
+    __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION);
+    // End of stack check.
+
+    // Push current limit and index.
+    __ bind(&okay);
+    __ push(v0);  // Limit.
+    __ mov(a1, zero_reg);  // Initial index.
+    __ push(a1);
 
-  // Load the current argument from the arguments array and push it to the
-  // stack.
-  // a0: current argument index
-  __ bind(&loop);
-  __ lw(a1, MemOperand(fp, kArgsOffset));
-  __ push(a1);
-  __ push(a0);
+    // Get the receiver.
+    __ lw(a0, MemOperand(fp, kRecvOffset));
 
-  // Call the runtime to access the property in the arguments array.
-  __ CallRuntime(Runtime::kGetProperty, 2);
-  __ push(v0);
+    // Check that the function is a JS function (otherwise it must be a proxy).
+    Label push_receiver;
+    __ lw(a1, MemOperand(fp, kFunctionOffset));
+    __ GetObjectType(a1, a2, a2);
+    __ Branch(&push_receiver, ne, a2, Operand(JS_FUNCTION_TYPE));
 
-  // Use inline caching to access the arguments.
-  __ lw(a0, MemOperand(fp, kIndexOffset));
-  __ Addu(a0, a0, Operand(1 << kSmiTagSize));
-  __ sw(a0, MemOperand(fp, kIndexOffset));
+    // Change context eagerly to get the right global object if necessary.
+    __ lw(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
+    // Load the shared function info while the function is still in a1.
+    __ lw(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
 
-  // Test if the copy loop has finished copying all the elements from the
-  // arguments object.
-  __ bind(&entry);
-  __ lw(a1, MemOperand(fp, kLimitOffset));
-  __ Branch(&loop, ne, a0, Operand(a1));
-  // Invoke the function.
-  ParameterCount actual(a0);
-  __ sra(a0, a0, kSmiTagSize);
-  __ lw(a1, MemOperand(fp, kFunctionOffset));
-  __ InvokeFunction(a1, actual, CALL_FUNCTION,
-                    NullCallWrapper(), CALL_AS_METHOD);
-
-  // Tear down the internal frame and remove function, receiver and args.
-  __ LeaveInternalFrame();
-  __ Addu(sp, sp, Operand(3 * kPointerSize));
-  __ Ret();
+    // Compute the receiver.
+    // Do not transform the receiver for strict mode functions.
+    Label call_to_object, use_global_receiver;
+    __ lw(a2, FieldMemOperand(a2, SharedFunctionInfo::kCompilerHintsOffset));
+    __ And(t3, a2, Operand(1 << (SharedFunctionInfo::kStrictModeFunction +
+                                 kSmiTagSize)));
+    __ Branch(&push_receiver, ne, t3, Operand(zero_reg));
+
+    // Do not transform the receiver for native (Compilerhints already in a2).
+    __ And(t3, a2, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
+    __ Branch(&push_receiver, ne, t3, Operand(zero_reg));
+
+    // Compute the receiver in non-strict mode.
+    __ And(t3, a0, Operand(kSmiTagMask));
+    __ Branch(&call_to_object, eq, t3, Operand(zero_reg));
+    __ LoadRoot(a1, Heap::kNullValueRootIndex);
+    __ Branch(&use_global_receiver, eq, a0, Operand(a1));
+    __ LoadRoot(a2, Heap::kUndefinedValueRootIndex);
+    __ Branch(&use_global_receiver, eq, a0, Operand(a2));
+
+    // Check if the receiver is already a JavaScript object.
+    // a0: receiver
+    STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
+    __ GetObjectType(a0, a1, a1);
+    __ Branch(&push_receiver, ge, a1, Operand(FIRST_SPEC_OBJECT_TYPE));
+
+    // Convert the receiver to a regular object.
+    // a0: receiver
+    __ bind(&call_to_object);
+    __ push(a0);
+    __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+    __ mov(a0, v0);  // Put object in a0 to match other paths to push_receiver.
+    __ Branch(&push_receiver);
+
+    // Use the current global receiver object as the receiver.
+    __ bind(&use_global_receiver);
+    const int kGlobalOffset =
+        Context::kHeaderSize + Context::GLOBAL_INDEX * kPointerSize;
+    __ lw(a0, FieldMemOperand(cp, kGlobalOffset));
+    __ lw(a0, FieldMemOperand(a0, GlobalObject::kGlobalContextOffset));
+    __ lw(a0, FieldMemOperand(a0, kGlobalOffset));
+    __ lw(a0, FieldMemOperand(a0, GlobalObject::kGlobalReceiverOffset));
+
+    // Push the receiver.
+    // a0: receiver
+    __ bind(&push_receiver);
+    __ push(a0);
+
+    // Copy all arguments from the array to the stack.
+    Label entry, loop;
+    __ lw(a0, MemOperand(fp, kIndexOffset));
+    __ Branch(&entry);
+
+    // Load the current argument from the arguments array and push it to the
+    // stack.
+    // a0: current argument index
+    __ bind(&loop);
+    __ lw(a1, MemOperand(fp, kArgsOffset));
+    __ push(a1);
+    __ push(a0);
+
+    // Call the runtime to access the property in the arguments array.
+    __ CallRuntime(Runtime::kGetProperty, 2);
+    __ push(v0);
+
+    // Use inline caching to access the arguments.
+    __ lw(a0, MemOperand(fp, kIndexOffset));
+    __ Addu(a0, a0, Operand(1 << kSmiTagSize));
+    __ sw(a0, MemOperand(fp, kIndexOffset));
+
+    // Test if the copy loop has finished copying all the elements from the
+    // arguments object.
+    __ bind(&entry);
+    __ lw(a1, MemOperand(fp, kLimitOffset));
+    __ Branch(&loop, ne, a0, Operand(a1));
+
+    // Invoke the function.
+    Label call_proxy;
+    ParameterCount actual(a0);
+    __ sra(a0, a0, kSmiTagSize);
+    __ lw(a1, MemOperand(fp, kFunctionOffset));
+    __ GetObjectType(a1, a2, a2);
+    __ Branch(&call_proxy, ne, a2, Operand(JS_FUNCTION_TYPE));
+
+    __ InvokeFunction(a1, actual, CALL_FUNCTION,
+                      NullCallWrapper(), CALL_AS_METHOD);
+
+    frame_scope.GenerateLeaveFrame();
+    __ Ret(USE_DELAY_SLOT);
+    __ Addu(sp, sp, Operand(3 * kPointerSize));  // In delay slot.
+
+    // Invoke the function proxy.
+    __ bind(&call_proxy);
+    __ push(a1);  // Add function proxy as last argument.
+    __ Addu(a0, a0, Operand(1));
+    __ li(a2, Operand(0, RelocInfo::NONE));
+    __ SetCallKind(t1, CALL_AS_METHOD);
+    __ GetBuiltinEntry(a3, Builtins::CALL_FUNCTION_PROXY);
+    __ Call(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(),
+            RelocInfo::CODE_TARGET);
+
+    // Tear down the internal frame and remove function, receiver and args.
+  }
+
+  __ Ret(USE_DELAY_SLOT);
+  __ Addu(sp, sp, Operand(3 * kPointerSize));  // In delay slot.
 }