webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 420 insertions, 235 deletions

diff --git a/Source/JavaScriptCore/jit/JIT.cpp b/Source/JavaScriptCore/jit/JIT.cpp
index c3508b01d..e74219b62 100644
--- a/Source/JavaScriptCore/jit/JIT.cpp
+++ b/Source/JavaScriptCore/jit/JIT.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008, 2009, 2012, 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009, 2012-2016 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -26,63 +26,75 @@
 #include "config.h"
 
 #if ENABLE(JIT)
-#include "JIT.h"
 
-// This probably does not belong here; adding here for now as a quick Windows build fix.
-#if ENABLE(ASSEMBLER) && CPU(X86) && !OS(MAC_OS_X)
-#include "MacroAssembler.h"
-JSC::MacroAssemblerX86Common::SSE2CheckState JSC::MacroAssemblerX86Common::s_sse2CheckState = NotCheckedSSE2;
-#endif
+#include "JIT.h"
 
+#include "BytecodeGraph.h"
 #include "CodeBlock.h"
+#include "CodeBlockWithJITType.h"
 #include "DFGCapabilities.h"
 #include "Interpreter.h"
 #include "JITInlines.h"
 #include "JITOperations.h"
 #include "JSArray.h"
+#include "JSCInlines.h"
 #include "JSFunction.h"
 #include "LinkBuffer.h"
-#include "Operations.h"
-#include "RepatchBuffer.h"
+#include "MaxFrameExtentForSlowPathCall.h"
+#include "PCToCodeOriginMap.h"
+#include "ProfilerDatabase.h"
+#include "ProgramCodeBlock.h"
 #include "ResultType.h"
-#include "SamplingTool.h"
 #include "SlowPathCall.h"
+#include "StackAlignment.h"
+#include "TypeProfilerLog.h"
 #include <wtf/CryptographicallyRandomNumber.h>
+#include <wtf/GraphNodeWorklist.h>
+#include <wtf/SimpleStats.h>
 
 using namespace std;
 
 namespace JSC {
 
-void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction)
-{
-    RepatchBuffer repatchBuffer(codeblock);
-    repatchBuffer.relinkNearCallerToTrampoline(returnAddress, newCalleeFunction);
-}
+double totalBaselineCompileTime;
+double totalDFGCompileTime;
+double totalFTLCompileTime;
+double totalFTLDFGCompileTime;
+double totalFTLB3CompileTime;
 
-void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction)
+void ctiPatchCallByReturnAddress(ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction)
 {
-    RepatchBuffer repatchBuffer(codeblock);
-    repatchBuffer.relinkCallerToTrampoline(returnAddress, newCalleeFunction);
+    MacroAssembler::repatchCall(
+        CodeLocationCall(MacroAssemblerCodePtr(returnAddress)),
+        newCalleeFunction);
 }
 
-void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction)
+JIT::CodeRef JIT::compileCTINativeCall(VM* vm, NativeFunction func)
 {
-    RepatchBuffer repatchBuffer(codeblock);
-    repatchBuffer.relinkCallerToFunction(returnAddress, newCalleeFunction);
+    if (!vm->canUseJIT())
+        return CodeRef::createLLIntCodeRef(llint_native_call_trampoline);
+    JIT jit(vm, 0);
+    return jit.privateCompileCTINativeCall(vm, func);
 }
 
-JIT::JIT(VM* vm, CodeBlock* codeBlock)
+JIT::JIT(VM* vm, CodeBlock* codeBlock, unsigned loopOSREntryBytecodeOffset)
     : JSInterfaceJIT(vm, codeBlock)
     , m_interpreter(vm->interpreter)
     , m_labels(codeBlock ? codeBlock->numberOfInstructions() : 0)
-    , m_bytecodeOffset((unsigned)-1)
+    , m_bytecodeOffset(std::numeric_limits<unsigned>::max())
     , m_getByIdIndex(UINT_MAX)
     , m_putByIdIndex(UINT_MAX)
     , m_byValInstructionIndex(UINT_MAX)
     , m_callLinkInfoIndex(UINT_MAX)
     , m_randomGenerator(cryptographicallyRandomNumber())
+    , m_pcToCodeOriginMapBuilder(*vm)
     , m_canBeOptimized(false)
     , m_shouldEmitProfiling(false)
+    , m_loopOSREntryBytecodeOffset(loopOSREntryBytecodeOffset)
+{
+}
+
+JIT::~JIT()
 {
 }
 
@@ -96,27 +108,61 @@ void JIT::emitEnterOptimizationCheck()
     
     skipOptimize.append(branchAdd32(Signed, TrustedImm32(Options::executionCounterIncrementForEntry()), AbsoluteAddress(m_codeBlock->addressOfJITExecuteCounter())));
     ASSERT(!m_bytecodeOffset);
+
+    copyCalleeSavesFromFrameOrRegisterToVMEntryFrameCalleeSavesBuffer();
+
     callOperation(operationOptimize, m_bytecodeOffset);
     skipOptimize.append(branchTestPtr(Zero, returnValueGPR));
+    move(returnValueGPR2, stackPointerRegister);
     jump(returnValueGPR);
     skipOptimize.link(this);
 }
 #endif
 
+void JIT::emitNotifyWrite(WatchpointSet* set)
+{
+    if (!set || set->state() == IsInvalidated) {
+        addSlowCase(Jump());
+        return;
+    }
+    
+    addSlowCase(branch8(NotEqual, AbsoluteAddress(set->addressOfState()), TrustedImm32(IsInvalidated)));
+}
+
+void JIT::emitNotifyWrite(GPRReg pointerToSet)
+{
+    addSlowCase(branch8(NotEqual, Address(pointerToSet, WatchpointSet::offsetOfState()), TrustedImm32(IsInvalidated)));
+}
+
+void JIT::assertStackPointerOffset()
+{
+    if (ASSERT_DISABLED)
+        return;
+    
+    addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, regT0);
+    Jump ok = branchPtr(Equal, regT0, stackPointerRegister);
+    breakpoint();
+    ok.link(this);
+}
+
 #define NEXT_OPCODE(name) \
     m_bytecodeOffset += OPCODE_LENGTH(name); \
     break;
 
 #define DEFINE_SLOW_OP(name) \
     case op_##name: { \
-        JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_##name); \
-        slowPathCall.call(); \
+        if (m_bytecodeOffset >= startBytecodeOffset) { \
+            JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_##name); \
+            slowPathCall.call(); \
+        } \
         NEXT_OPCODE(op_##name); \
     }
 
 #define DEFINE_OP(name) \
     case name: { \
-        emit_##name(currentInstruction); \
+        if (m_bytecodeOffset >= startBytecodeOffset) { \
+            emit_##name(currentInstruction); \
+        } \
         NEXT_OPCODE(name); \
     }
 
@@ -128,17 +174,60 @@ void JIT::emitEnterOptimizationCheck()
 
 void JIT::privateCompileMainPass()
 {
+    if (false)
+        dataLog("Compiling ", *m_codeBlock, "\n");
+    
+    jitAssertTagsInPlace();
+    jitAssertArgumentCountSane();
+    
     Instruction* instructionsBegin = m_codeBlock->instructions().begin();
-    unsigned instructionCount = m_codeBlock->instructions().size();
+    unsigned instructionCount = m_instructions.size();
 
     m_callLinkInfoIndex = 0;
 
+    unsigned startBytecodeOffset = 0;
+    if (m_loopOSREntryBytecodeOffset && m_codeBlock->inherits(*m_codeBlock->vm(), ProgramCodeBlock::info())) {
+        // We can only do this optimization because we execute ProgramCodeBlock's exactly once.
+        // This optimization would be invalid otherwise. When the LLInt determines it wants to
+        // do OSR entry into the baseline JIT in a loop, it will pass in the bytecode offset it
+        // was executing at when it kicked off our compilation. We only need to compile code for
+        // anything reachable from that bytecode offset.
+
+        // We only bother building the bytecode graph if it could save time and executable
+        // memory. We pick an arbitrary offset where we deem this is profitable.
+        if (m_loopOSREntryBytecodeOffset >= 200) {
+            // As a simplification, we don't find all bytecode ranges that are unreachable.
+            // Instead, we just find the minimum bytecode offset that is reachable, and
+            // compile code from that bytecode offset onwards.
+
+            BytecodeGraph<CodeBlock> graph(m_codeBlock, m_instructions);
+            BytecodeBasicBlock* block = graph.findBasicBlockForBytecodeOffset(m_loopOSREntryBytecodeOffset);
+            RELEASE_ASSERT(block);
+
+            GraphNodeWorklist<BytecodeBasicBlock*> worklist;
+            startBytecodeOffset = UINT_MAX;
+            worklist.push(block);
+            while (BytecodeBasicBlock* block = worklist.pop()) {
+                startBytecodeOffset = std::min(startBytecodeOffset, block->leaderOffset());
+                worklist.pushAll(block->successors());
+            }
+        }
+    }
+
     for (m_bytecodeOffset = 0; m_bytecodeOffset < instructionCount; ) {
+        if (m_bytecodeOffset == startBytecodeOffset && startBytecodeOffset > 0) {
+            // We've proven all bytecode instructions up until here are unreachable.
+            // Let's ensure that by crashing if it's ever hit.
+            breakpoint();
+        }
+
         if (m_disassembler)
             m_disassembler->setForBytecodeMainPath(m_bytecodeOffset, label());
         Instruction* currentInstruction = instructionsBegin + m_bytecodeOffset;
         ASSERT_WITH_MESSAGE(m_interpreter->isOpcode(currentInstruction->u.opcode), "privateCompileMainPass gone bad @ %d", m_bytecodeOffset);
 
+        m_pcToCodeOriginMapBuilder.appendItem(label(), CodeOrigin(m_bytecodeOffset));
+
 #if ENABLE(OPCODE_SAMPLING)
         if (m_bytecodeOffset > 0) // Avoid the overhead of sampling op_enter twice.
             sampleInstruction(currentInstruction);
@@ -158,55 +247,72 @@ void JIT::privateCompileMainPass()
                 AbsoluteAddress(m_compilation->executionCounterFor(Profiler::OriginStack(Profiler::Origin(
                     m_compilation->bytecodes(), m_bytecodeOffset)))->address()));
         }
+        
+        if (Options::eagerlyUpdateTopCallFrame())
+            updateTopCallFrame();
+
+        unsigned bytecodeOffset = m_bytecodeOffset;
 
         switch (opcodeID) {
-        DEFINE_SLOW_OP(del_by_val)
         DEFINE_SLOW_OP(in)
         DEFINE_SLOW_OP(less)
         DEFINE_SLOW_OP(lesseq)
         DEFINE_SLOW_OP(greater)
         DEFINE_SLOW_OP(greatereq)
         DEFINE_SLOW_OP(is_function)
-        DEFINE_SLOW_OP(is_object)
+        DEFINE_SLOW_OP(is_object_or_null)
         DEFINE_SLOW_OP(typeof)
 
-        DEFINE_OP(op_touch_entry)
         DEFINE_OP(op_add)
         DEFINE_OP(op_bitand)
         DEFINE_OP(op_bitor)
         DEFINE_OP(op_bitxor)
         DEFINE_OP(op_call)
+        DEFINE_OP(op_tail_call)
         DEFINE_OP(op_call_eval)
         DEFINE_OP(op_call_varargs)
+        DEFINE_OP(op_tail_call_varargs)
+        DEFINE_OP(op_tail_call_forward_arguments)
+        DEFINE_OP(op_construct_varargs)
         DEFINE_OP(op_catch)
         DEFINE_OP(op_construct)
-        DEFINE_OP(op_get_callee)
         DEFINE_OP(op_create_this)
         DEFINE_OP(op_to_this)
-        DEFINE_OP(op_init_lazy_reg)
-        DEFINE_OP(op_create_arguments)
+        DEFINE_OP(op_create_direct_arguments)
+        DEFINE_OP(op_create_scoped_arguments)
+        DEFINE_OP(op_create_cloned_arguments)
+        DEFINE_OP(op_get_argument)
+        DEFINE_OP(op_argument_count)
+        DEFINE_OP(op_create_rest)
+        DEFINE_OP(op_get_rest_length)
+        DEFINE_OP(op_check_tdz)
+        DEFINE_OP(op_assert)
         DEFINE_OP(op_debug)
         DEFINE_OP(op_del_by_id)
+        DEFINE_OP(op_del_by_val)
         DEFINE_OP(op_div)
         DEFINE_OP(op_end)
         DEFINE_OP(op_enter)
-        DEFINE_OP(op_create_activation)
+        DEFINE_OP(op_get_scope)
         DEFINE_OP(op_eq)
         DEFINE_OP(op_eq_null)
-        case op_get_by_id_out_of_line:
+        DEFINE_OP(op_try_get_by_id)
         case op_get_array_length:
+        case op_get_by_id_proto_load:
+        case op_get_by_id_unset:
         DEFINE_OP(op_get_by_id)
-        DEFINE_OP(op_get_arguments_length)
+        DEFINE_OP(op_get_by_id_with_this)
         DEFINE_OP(op_get_by_val)
-        DEFINE_OP(op_get_argument_by_val)
-        DEFINE_OP(op_get_by_pname)
-        DEFINE_OP(op_get_pnames)
-        DEFINE_OP(op_check_has_instance)
+        DEFINE_OP(op_get_by_val_with_this)
+        DEFINE_OP(op_overrides_has_instance)
         DEFINE_OP(op_instanceof)
+        DEFINE_OP(op_instanceof_custom)
+        DEFINE_OP(op_is_empty)
         DEFINE_OP(op_is_undefined)
         DEFINE_OP(op_is_boolean)
         DEFINE_OP(op_is_number)
-        DEFINE_OP(op_is_string)
+        DEFINE_OP(op_is_object)
+        DEFINE_OP(op_is_cell_with_type)
         DEFINE_OP(op_jeq_null)
         DEFINE_OP(op_jfalse)
         DEFINE_OP(op_jmp)
@@ -222,9 +328,9 @@ void JIT::privateCompileMainPass()
         DEFINE_OP(op_jngreatereq)
         DEFINE_OP(op_jtrue)
         DEFINE_OP(op_loop_hint)
+        DEFINE_OP(op_watchdog)
         DEFINE_OP(op_lshift)
         DEFINE_OP(op_mod)
-        DEFINE_OP(op_captured_mov)
         DEFINE_OP(op_mov)
         DEFINE_OP(op_mul)
         DEFINE_OP(op_negate)
@@ -233,80 +339,88 @@ void JIT::privateCompileMainPass()
         DEFINE_OP(op_new_array)
         DEFINE_OP(op_new_array_with_size)
         DEFINE_OP(op_new_array_buffer)
+        DEFINE_OP(op_new_array_with_spread)
+        DEFINE_OP(op_spread)
         DEFINE_OP(op_new_func)
-        DEFINE_OP(op_new_captured_func)
         DEFINE_OP(op_new_func_exp)
+        DEFINE_OP(op_new_generator_func)
+        DEFINE_OP(op_new_generator_func_exp)
+        DEFINE_OP(op_new_async_func)
+        DEFINE_OP(op_new_async_func_exp)
         DEFINE_OP(op_new_object)
         DEFINE_OP(op_new_regexp)
-        DEFINE_OP(op_next_pname)
         DEFINE_OP(op_not)
         DEFINE_OP(op_nstricteq)
-        DEFINE_OP(op_pop_scope)
         DEFINE_OP(op_dec)
         DEFINE_OP(op_inc)
-        DEFINE_OP(op_profile_did_call)
-        DEFINE_OP(op_profile_will_call)
-        DEFINE_OP(op_push_name_scope)
+        DEFINE_OP(op_pow)
+        DEFINE_OP(op_profile_type)
+        DEFINE_OP(op_profile_control_flow)
         DEFINE_OP(op_push_with_scope)
-        case op_put_by_id_out_of_line:
-        case op_put_by_id_transition_direct:
-        case op_put_by_id_transition_normal:
-        case op_put_by_id_transition_direct_out_of_line:
-        case op_put_by_id_transition_normal_out_of_line:
+        DEFINE_OP(op_create_lexical_environment)
+        DEFINE_OP(op_get_parent_scope)
         DEFINE_OP(op_put_by_id)
+        DEFINE_OP(op_put_by_id_with_this)
         DEFINE_OP(op_put_by_index)
         case op_put_by_val_direct:
         DEFINE_OP(op_put_by_val)
-        DEFINE_OP(op_put_getter_setter)
-        case op_init_global_const_nop:
-            NEXT_OPCODE(op_init_global_const_nop);
-        DEFINE_OP(op_init_global_const)
+        DEFINE_OP(op_put_by_val_with_this)
+        DEFINE_OP(op_put_getter_by_id)
+        DEFINE_OP(op_put_setter_by_id)
+        DEFINE_OP(op_put_getter_setter_by_id)
+        DEFINE_OP(op_put_getter_by_val)
+        DEFINE_OP(op_put_setter_by_val)
+        DEFINE_OP(op_define_data_property)
+        DEFINE_OP(op_define_accessor_property)
 
         DEFINE_OP(op_ret)
-        DEFINE_OP(op_ret_object_or_this)
         DEFINE_OP(op_rshift)
         DEFINE_OP(op_unsigned)
         DEFINE_OP(op_urshift)
+        DEFINE_OP(op_set_function_name)
         DEFINE_OP(op_strcat)
         DEFINE_OP(op_stricteq)
         DEFINE_OP(op_sub)
         DEFINE_OP(op_switch_char)
         DEFINE_OP(op_switch_imm)
         DEFINE_OP(op_switch_string)
-        DEFINE_OP(op_tear_off_activation)
-        DEFINE_OP(op_tear_off_arguments)
         DEFINE_OP(op_throw)
         DEFINE_OP(op_throw_static_error)
         DEFINE_OP(op_to_number)
+        DEFINE_OP(op_to_string)
         DEFINE_OP(op_to_primitive)
 
         DEFINE_OP(op_resolve_scope)
         DEFINE_OP(op_get_from_scope)
         DEFINE_OP(op_put_to_scope)
-
-        case op_get_by_id_chain:
-        case op_get_by_id_generic:
-        case op_get_by_id_proto:
-        case op_get_by_id_self:
-        case op_get_by_id_getter_chain:
-        case op_get_by_id_getter_proto:
-        case op_get_by_id_getter_self:
-        case op_get_by_id_custom_chain:
-        case op_get_by_id_custom_proto:
-        case op_get_by_id_custom_self:
-        case op_get_string_length:
-        case op_put_by_id_generic:
-        case op_put_by_id_replace:
-        case op_put_by_id_transition:
+        DEFINE_OP(op_get_from_arguments)
+        DEFINE_OP(op_put_to_arguments)
+
+        DEFINE_OP(op_get_enumerable_length)
+        DEFINE_OP(op_has_generic_property)
+        DEFINE_OP(op_has_structure_property)
+        DEFINE_OP(op_has_indexed_property)
+        DEFINE_OP(op_get_direct_pname)
+        DEFINE_OP(op_get_property_enumerator)
+        DEFINE_OP(op_enumerator_structure_pname)
+        DEFINE_OP(op_enumerator_generic_pname)
+        DEFINE_OP(op_to_index_string)
+            
+        DEFINE_OP(op_log_shadow_chicken_prologue)
+        DEFINE_OP(op_log_shadow_chicken_tail)
+        default:
             RELEASE_ASSERT_NOT_REACHED();
         }
+
+        if (false)
+            dataLog("At ", bytecodeOffset, ": ", m_slowCases.size(), "\n");
     }
 
-    RELEASE_ASSERT(m_callLinkInfoIndex == m_callStructureStubCompilationInfo.size());
+    RELEASE_ASSERT(m_callLinkInfoIndex == m_callCompilationInfo.size());
 
 #ifndef NDEBUG
     // Reset this, in order to guard its use with ASSERTs.
-    m_bytecodeOffset = (unsigned)-1;
+    m_bytecodeOffset = std::numeric_limits<unsigned>::max();
 #endif
 }
 
@@ -338,6 +452,8 @@ void JIT::privateCompileSlowCases()
     for (Vector<SlowCaseEntry>::iterator iter = m_slowCases.begin(); iter != m_slowCases.end();) {
         m_bytecodeOffset = iter->to;
 
+        m_pcToCodeOriginMapBuilder.appendItem(label(), CodeOrigin(m_bytecodeOffset));
+
         unsigned firstTo = m_bytecodeOffset;
 
         Instruction* currentInstruction = instructionsBegin + m_bytecodeOffset;
@@ -359,25 +475,26 @@ void JIT::privateCompileSlowCases()
         DEFINE_SLOWCASE_OP(op_bitor)
         DEFINE_SLOWCASE_OP(op_bitxor)
         DEFINE_SLOWCASE_OP(op_call)
+        DEFINE_SLOWCASE_OP(op_tail_call)
         DEFINE_SLOWCASE_OP(op_call_eval)
         DEFINE_SLOWCASE_OP(op_call_varargs)
+        DEFINE_SLOWCASE_OP(op_tail_call_varargs)
+        DEFINE_SLOWCASE_OP(op_tail_call_forward_arguments)
+        DEFINE_SLOWCASE_OP(op_construct_varargs)
         DEFINE_SLOWCASE_OP(op_construct)
         DEFINE_SLOWCASE_OP(op_to_this)
+        DEFINE_SLOWCASE_OP(op_check_tdz)
         DEFINE_SLOWCASE_OP(op_create_this)
-        DEFINE_SLOWCASE_OP(op_captured_mov)
         DEFINE_SLOWCASE_OP(op_div)
         DEFINE_SLOWCASE_OP(op_eq)
-        DEFINE_SLOWCASE_OP(op_get_callee)
-        case op_get_by_id_out_of_line:
+        DEFINE_SLOWCASE_OP(op_try_get_by_id)
         case op_get_array_length:
+        case op_get_by_id_proto_load:
+        case op_get_by_id_unset:
         DEFINE_SLOWCASE_OP(op_get_by_id)
-        DEFINE_SLOWCASE_OP(op_get_arguments_length)
         DEFINE_SLOWCASE_OP(op_get_by_val)
-        DEFINE_SLOWCASE_OP(op_get_argument_by_val)
-        DEFINE_SLOWCASE_OP(op_get_by_pname)
-        DEFINE_SLOWCASE_OP(op_check_has_instance)
         DEFINE_SLOWCASE_OP(op_instanceof)
-        DEFINE_SLOWCASE_OP(op_jfalse)
+        DEFINE_SLOWCASE_OP(op_instanceof_custom)
         DEFINE_SLOWCASE_OP(op_jless)
         DEFINE_SLOWCASE_OP(op_jlesseq)
         DEFINE_SLOWCASE_OP(op_jgreater)
@@ -386,8 +503,8 @@ void JIT::privateCompileSlowCases()
         DEFINE_SLOWCASE_OP(op_jnlesseq)
         DEFINE_SLOWCASE_OP(op_jngreater)
         DEFINE_SLOWCASE_OP(op_jngreatereq)
-        DEFINE_SLOWCASE_OP(op_jtrue)
         DEFINE_SLOWCASE_OP(op_loop_hint)
+        DEFINE_SLOWCASE_OP(op_watchdog)
         DEFINE_SLOWCASE_OP(op_lshift)
         DEFINE_SLOWCASE_OP(op_mod)
         DEFINE_SLOWCASE_OP(op_mul)
@@ -398,11 +515,6 @@ void JIT::privateCompileSlowCases()
         DEFINE_SLOWCASE_OP(op_nstricteq)
         DEFINE_SLOWCASE_OP(op_dec)
         DEFINE_SLOWCASE_OP(op_inc)
-        case op_put_by_id_out_of_line:
-        case op_put_by_id_transition_direct:
-        case op_put_by_id_transition_normal:
-        case op_put_by_id_transition_direct_out_of_line:
-        case op_put_by_id_transition_normal_out_of_line:
         DEFINE_SLOWCASE_OP(op_put_by_id)
         case op_put_by_val_direct:
         DEFINE_SLOWCASE_OP(op_put_by_val)
@@ -412,7 +524,11 @@ void JIT::privateCompileSlowCases()
         DEFINE_SLOWCASE_OP(op_stricteq)
         DEFINE_SLOWCASE_OP(op_sub)
         DEFINE_SLOWCASE_OP(op_to_number)
+        DEFINE_SLOWCASE_OP(op_to_string)
         DEFINE_SLOWCASE_OP(op_to_primitive)
+        DEFINE_SLOWCASE_OP(op_has_indexed_property)
+        DEFINE_SLOWCASE_OP(op_has_structure_property)
+        DEFINE_SLOWCASE_OP(op_get_direct_pname)
 
         DEFINE_SLOWCASE_OP(op_resolve_scope)
         DEFINE_SLOWCASE_OP(op_get_from_scope)
@@ -422,6 +538,9 @@ void JIT::privateCompileSlowCases()
             RELEASE_ASSERT_NOT_REACHED();
         }
 
+        if (false)
+            dataLog("At ", firstTo, " slow: ", iter - m_slowCases.begin(), "\n");
+
         RELEASE_ASSERT_WITH_MESSAGE(iter == m_slowCases.end() || firstTo != iter->to, "Not enough jumps linked in slow case codegen.");
         RELEASE_ASSERT_WITH_MESSAGE(firstTo == (iter - 1)->to, "Too many jumps linked in slow case codegen.");
         
@@ -433,17 +552,26 @@ void JIT::privateCompileSlowCases()
 
     RELEASE_ASSERT(m_getByIdIndex == m_getByIds.size());
     RELEASE_ASSERT(m_putByIdIndex == m_putByIds.size());
-    RELEASE_ASSERT(m_callLinkInfoIndex == m_callStructureStubCompilationInfo.size());
+    RELEASE_ASSERT(m_callLinkInfoIndex == m_callCompilationInfo.size());
     RELEASE_ASSERT(numberOfValueProfiles == m_codeBlock->numberOfValueProfiles());
 
 #ifndef NDEBUG
     // Reset this, in order to guard its use with ASSERTs.
-    m_bytecodeOffset = (unsigned)-1;
+    m_bytecodeOffset = std::numeric_limits<unsigned>::max();
 #endif
 }
 
-CompilationResult JIT::privateCompile(JITCompilationEffort effort)
+void JIT::compileWithoutLinking(JITCompilationEffort effort)
 {
+    double before = 0;
+    if (UNLIKELY(computeCompileTimes()))
+        before = monotonicallyIncreasingTimeMS();
+    
+    {
+        ConcurrentJSLocker locker(m_codeBlock->m_lock);
+        m_instructions = m_codeBlock->instructions().clone();
+    }
+
     DFG::CapabilityLevel level = m_codeBlock->capabilityLevel();
     switch (level) {
     case DFG::CannotCompile:
@@ -451,11 +579,6 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
         m_canBeOptimizedOrInlined = false;
         m_shouldEmitProfiling = false;
         break;
-    case DFG::CanInline:
-        m_canBeOptimized = false;
-        m_canBeOptimizedOrInlined = true;
-        m_shouldEmitProfiling = true;
-        break;
     case DFG::CanCompile:
     case DFG::CanCompileAndInline:
         m_canBeOptimized = true;
@@ -469,6 +592,7 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
     
     switch (m_codeBlock->codeType()) {
     case GlobalCode:
+    case ModuleCode:
     case EvalCode:
         m_codeBlock->m_shouldAlwaysBeInlined = false;
         break;
@@ -478,9 +602,9 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
         m_codeBlock->m_shouldAlwaysBeInlined &= canInline(level) && DFG::mightInlineFunction(m_codeBlock);
         break;
     }
-    
-    if (Options::showDisassembly() || m_vm->m_perBytecodeProfiler)
-        m_disassembler = adoptPtr(new JITDisassembler(m_codeBlock));
+
+    if (Options::dumpDisassembly() || (m_vm->m_perBytecodeProfiler && Options::disassembleBaselineForProfiler()))
+        m_disassembler = std::make_unique<JITDisassembler>(m_codeBlock);
     if (m_vm->m_perBytecodeProfiler) {
         m_compilation = adoptRef(
             new Profiler::Compilation(
@@ -489,6 +613,8 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
         m_compilation->addProfiledBytecodes(*m_vm->m_perBytecodeProfiler, m_codeBlock);
     }
     
+    m_pcToCodeOriginMapBuilder.appendItem(label(), CodeOrigin(0, nullptr));
+
     if (m_disassembler)
         m_disassembler->setStartOfCode(label());
 
@@ -496,9 +622,8 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
     if (m_randomGenerator.getUint32() & 1)
         nop();
 
-    preserveReturnAddressAfterCall(regT2);
-    emitPutReturnPCToCallFrameHeader(regT2);
-    emitPutImmediateToCallFrameHeader(m_codeBlock, JSStack::CodeBlock);
+    emitFunctionPrologue();
+    emitPutToCallFrameHeader(m_codeBlock, CallFrameSlot::codeBlock);
 
     Label beginLabel(this);
 
@@ -507,9 +632,8 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
     sampleInstruction(m_codeBlock->instructions().begin());
 #endif
 
-    Jump stackCheck;
     if (m_codeBlock->codeType() == FunctionCode) {
-        ASSERT(m_bytecodeOffset == (unsigned)-1);
+        ASSERT(m_bytecodeOffset == std::numeric_limits<unsigned>::max());
         if (shouldEmitProfiling()) {
             for (int argument = 0; argument < m_codeBlock->numParameters(); ++argument) {
                 // If this is a constructor, then we want to put in a dummy profiling site (to
@@ -526,49 +650,55 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
                 emitValueProfilingSite(m_codeBlock->valueProfileForArgument(argument));
             }
         }
-
-        addPtr(TrustedImm32(virtualRegisterForLocal(frameRegisterCountFor(m_codeBlock)).offset() * sizeof(Register)), callFrameRegister, regT1);
-        stackCheck = branchPtr(Above, AbsoluteAddress(m_vm->addressOfJSStackLimit()), regT1);
     }
 
-    Label functionBody = label();
+    addPtr(TrustedImm32(stackPointerOffsetFor(m_codeBlock) * sizeof(Register)), callFrameRegister, regT1);
+    Jump stackOverflow = branchPtr(Above, AbsoluteAddress(m_vm->addressOfSoftStackLimit()), regT1);
+
+    move(regT1, stackPointerRegister);
+    checkStackPointerAlignment();
+
+    emitSaveCalleeSaves();
+    emitMaterializeTagCheckRegisters();
     
+    RELEASE_ASSERT(!JITCode::isJIT(m_codeBlock->jitType()));
+
     privateCompileMainPass();
     privateCompileLinkPass();
     privateCompileSlowCases();
     
     if (m_disassembler)
         m_disassembler->setEndOfSlowPath(label());
+    m_pcToCodeOriginMapBuilder.appendItem(label(), PCToCodeOriginMapBuilder::defaultCodeOrigin());
 
-    Label arityCheck;
-    if (m_codeBlock->codeType() == FunctionCode) {
-        stackCheck.link(this);
-        m_bytecodeOffset = 0;
-        callOperationWithCallFrameRollbackOnException(operationStackCheck, m_codeBlock);
-#ifndef NDEBUG
-        m_bytecodeOffset = (unsigned)-1; // Reset this, in order to guard its use with ASSERTs.
-#endif
-        jump(functionBody);
+    stackOverflow.link(this);
+    m_bytecodeOffset = 0;
+    if (maxFrameExtentForSlowPathCall)
+        addPtr(TrustedImm32(-maxFrameExtentForSlowPathCall), stackPointerRegister);
+    callOperationWithCallFrameRollbackOnException(operationThrowStackOverflowError, m_codeBlock);
 
-        arityCheck = label();
+    if (m_codeBlock->codeType() == FunctionCode) {
+        m_arityCheck = label();
         store8(TrustedImm32(0), &m_codeBlock->m_shouldAlwaysBeInlined);
-        preserveReturnAddressAfterCall(regT2);
-        emitPutReturnPCToCallFrameHeader(regT2);
-        emitPutImmediateToCallFrameHeader(m_codeBlock, JSStack::CodeBlock);
+        emitFunctionPrologue();
+        emitPutToCallFrameHeader(m_codeBlock, CallFrameSlot::codeBlock);
 
-        load32(payloadFor(JSStack::ArgumentCount), regT1);
+        load32(payloadFor(CallFrameSlot::argumentCount), regT1);
         branch32(AboveOrEqual, regT1, TrustedImm32(m_codeBlock->m_numParameters)).linkTo(beginLabel, this);
 
         m_bytecodeOffset = 0;
 
+        if (maxFrameExtentForSlowPathCall)
+            addPtr(TrustedImm32(-maxFrameExtentForSlowPathCall), stackPointerRegister);
         callOperationWithCallFrameRollbackOnException(m_codeBlock->m_isConstructor ? operationConstructArityCheck : operationCallArityCheck);
-        if (returnValueGPR != regT0)
-            move(returnValueGPR, regT0);
-        branchTest32(Zero, regT0).linkTo(beginLabel, this);
-        emitNakedCall(m_vm->getCTIStub(arityFixup).code());
+        if (maxFrameExtentForSlowPathCall)
+            addPtr(TrustedImm32(maxFrameExtentForSlowPathCall), stackPointerRegister);
+        branchTest32(Zero, returnValueGPR).linkTo(beginLabel, this);
+        move(returnValueGPR, GPRInfo::argumentGPR0);
+        emitNakedCall(m_vm->getCTIStub(arityFixupGenerator).code());
 
 #if !ASSERT_DISABLED
-        m_bytecodeOffset = (unsigned)-1; // Reset this, in order to guard its use with ASSERTs.
+        m_bytecodeOffset = std::numeric_limits<unsigned>::max(); // Reset this, in order to guard its use with ASSERTs.
 #endif
 
         jump(beginLabel);
@@ -580,14 +710,33 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
     
     if (m_disassembler)
         m_disassembler->setEndOfCode(label());
+    m_pcToCodeOriginMapBuilder.appendItem(label(), PCToCodeOriginMapBuilder::defaultCodeOrigin());
+
+    m_linkBuffer = std::unique_ptr<LinkBuffer>(new LinkBuffer(*m_vm, *this, m_codeBlock, effort));
 
-    LinkBuffer patchBuffer(*m_vm, this, m_codeBlock, effort);
+    double after = 0;
+    if (UNLIKELY(computeCompileTimes())) {
+        after = monotonicallyIncreasingTimeMS();
+
+        if (Options::reportTotalCompileTimes())
+            totalBaselineCompileTime += after - before;
+    }
+    if (UNLIKELY(reportCompileTimes())) {
+        CString codeBlockName = toCString(*m_codeBlock);
+        
+        dataLog("Optimized ", codeBlockName, " with Baseline JIT into ", m_linkBuffer->size(), " bytes in ", after - before, " ms.\n");
+    }
+}
+
+CompilationResult JIT::link()
+{
+    LinkBuffer& patchBuffer = *m_linkBuffer;
+    
     if (patchBuffer.didFailToAllocate())
         return CompilationFailed;
 
     // Translate vPC offsets into addresses in JIT generated code, for switch tables.
-    for (unsigned i = 0; i < m_switches.size(); ++i) {
-        SwitchRecord record = m_switches[i];
+    for (auto& record : m_switches) {
         unsigned bytecodeOffset = record.bytecodeOffset;
 
         if (record.type != SwitchRecord::String) {
@@ -605,10 +754,9 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
 
             record.jumpTable.stringJumpTable->ctiDefault = patchBuffer.locationOf(m_labels[bytecodeOffset + record.defaultOffset]);
 
-            StringJumpTable::StringOffsetTable::iterator end = record.jumpTable.stringJumpTable->offsetTable.end();            
-            for (StringJumpTable::StringOffsetTable::iterator it = record.jumpTable.stringJumpTable->offsetTable.begin(); it != end; ++it) {
-                unsigned offset = it->value.branchOffset;
-                it->value.ctiOffset = offset ? patchBuffer.locationOf(m_labels[bytecodeOffset + offset]) : record.jumpTable.stringJumpTable->ctiDefault;
+            for (auto& location : record.jumpTable.stringJumpTable->offsetTable.values()) {
+                unsigned offset = location.branchOffset;
+                location.ctiOffset = offset ? patchBuffer.locationOf(m_labels[bytecodeOffset + offset]) : record.jumpTable.stringJumpTable->ctiDefault;
             }
         }
     }
@@ -618,9 +766,9 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
         handler.nativeCode = patchBuffer.locationOf(m_labels[handler.target]);
     }
 
-    for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
-        if (iter->to)
-            patchBuffer.link(iter->from, FunctionPtr(iter->to));
+    for (auto& record : m_calls) {
+        if (record.to)
+            patchBuffer.link(record.from, FunctionPtr(record.to));
     }
 
     for (unsigned i = m_getByIds.size(); i--;)
@@ -628,68 +776,77 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
     for (unsigned i = m_putByIds.size(); i--;)
         m_putByIds[i].finalize(patchBuffer);
 
-    m_codeBlock->setNumberOfByValInfos(m_byValCompilationInfo.size());
-    for (unsigned i = 0; i < m_byValCompilationInfo.size(); ++i) {
-        CodeLocationJump badTypeJump = CodeLocationJump(patchBuffer.locationOf(m_byValCompilationInfo[i].badTypeJump));
-        CodeLocationLabel doneTarget = patchBuffer.locationOf(m_byValCompilationInfo[i].doneTarget);
-        CodeLocationLabel slowPathTarget = patchBuffer.locationOf(m_byValCompilationInfo[i].slowPathTarget);
-        CodeLocationCall returnAddress = patchBuffer.locationOf(m_byValCompilationInfo[i].returnAddress);
-        
-        m_codeBlock->byValInfo(i) = ByValInfo(
-            m_byValCompilationInfo[i].bytecodeIndex,
-            badTypeJump,
-            m_byValCompilationInfo[i].arrayMode,
-            differenceBetweenCodePtr(badTypeJump, doneTarget),
-            differenceBetweenCodePtr(returnAddress, slowPathTarget));
+    if (m_byValCompilationInfo.size()) {
+        CodeLocationLabel exceptionHandler = patchBuffer.locationOf(m_exceptionHandler);
+
+        for (const auto& byValCompilationInfo : m_byValCompilationInfo) {
+            PatchableJump patchableNotIndexJump = byValCompilationInfo.notIndexJump;
+            CodeLocationJump notIndexJump = CodeLocationJump();
+            if (Jump(patchableNotIndexJump).isSet())
+                notIndexJump = CodeLocationJump(patchBuffer.locationOf(patchableNotIndexJump));
+            CodeLocationJump badTypeJump = CodeLocationJump(patchBuffer.locationOf(byValCompilationInfo.badTypeJump));
+            CodeLocationLabel doneTarget = patchBuffer.locationOf(byValCompilationInfo.doneTarget);
+            CodeLocationLabel nextHotPathTarget = patchBuffer.locationOf(byValCompilationInfo.nextHotPathTarget);
+            CodeLocationLabel slowPathTarget = patchBuffer.locationOf(byValCompilationInfo.slowPathTarget);
+            CodeLocationCall returnAddress = patchBuffer.locationOf(byValCompilationInfo.returnAddress);
+
+            *byValCompilationInfo.byValInfo = ByValInfo(
+                byValCompilationInfo.bytecodeIndex,
+                notIndexJump,
+                badTypeJump,
+                exceptionHandler,
+                byValCompilationInfo.arrayMode,
+                byValCompilationInfo.arrayProfile,
+                differenceBetweenCodePtr(badTypeJump, doneTarget),
+                differenceBetweenCodePtr(badTypeJump, nextHotPathTarget),
+                differenceBetweenCodePtr(returnAddress, slowPathTarget));
+        }
     }
-    m_codeBlock->setNumberOfCallLinkInfos(m_callStructureStubCompilationInfo.size());
-    for (unsigned i = 0; i < m_codeBlock->numberOfCallLinkInfos(); ++i) {
-        CallLinkInfo& info = m_codeBlock->callLinkInfo(i);
-        info.callType = m_callStructureStubCompilationInfo[i].callType;
-        info.codeOrigin = CodeOrigin(m_callStructureStubCompilationInfo[i].bytecodeIndex);
-        info.callReturnLocation = patchBuffer.locationOfNearCall(m_callStructureStubCompilationInfo[i].callReturnLocation);
-        info.hotPathBegin = patchBuffer.locationOf(m_callStructureStubCompilationInfo[i].hotPathBegin);
-        info.hotPathOther = patchBuffer.locationOfNearCall(m_callStructureStubCompilationInfo[i].hotPathOther);
-        info.calleeGPR = regT0;
+
+    for (auto& compilationInfo : m_callCompilationInfo) {
+        CallLinkInfo& info = *compilationInfo.callLinkInfo;
+        info.setCallLocations(
+            CodeLocationLabel(patchBuffer.locationOfNearCall(compilationInfo.callReturnLocation)),
+            CodeLocationLabel(patchBuffer.locationOf(compilationInfo.hotPathBegin)),
+            patchBuffer.locationOfNearCall(compilationInfo.hotPathOther));
     }
 
-#if ENABLE(DFG_JIT) || ENABLE(LLINT)
-    if (canBeOptimizedOrInlined()
-#if ENABLE(LLINT)
-        || true
-#endif
-        ) {
-        CompactJITCodeMap::Encoder jitCodeMapEncoder;
-        for (unsigned bytecodeOffset = 0; bytecodeOffset < m_labels.size(); ++bytecodeOffset) {
-            if (m_labels[bytecodeOffset].isSet())
-                jitCodeMapEncoder.append(bytecodeOffset, patchBuffer.offsetOf(m_labels[bytecodeOffset]));
-        }
-        m_codeBlock->setJITCodeMap(jitCodeMapEncoder.finish());
+    CompactJITCodeMap::Encoder jitCodeMapEncoder;
+    for (unsigned bytecodeOffset = 0; bytecodeOffset < m_labels.size(); ++bytecodeOffset) {
+        if (m_labels[bytecodeOffset].isSet())
+            jitCodeMapEncoder.append(bytecodeOffset, patchBuffer.offsetOf(m_labels[bytecodeOffset]));
     }
-#endif
+    m_codeBlock->setJITCodeMap(jitCodeMapEncoder.finish());
 
     MacroAssemblerCodePtr withArityCheck;
     if (m_codeBlock->codeType() == FunctionCode)
-        withArityCheck = patchBuffer.locationOf(arityCheck);
+        withArityCheck = patchBuffer.locationOf(m_arityCheck);
 
-    if (Options::showDisassembly())
+    if (Options::dumpDisassembly()) {
         m_disassembler->dump(patchBuffer);
+        patchBuffer.didAlreadyDisassemble();
+    }
     if (m_compilation) {
-        m_disassembler->reportToProfiler(m_compilation.get(), patchBuffer);
-        m_vm->m_perBytecodeProfiler->addCompilation(m_compilation);
+        if (Options::disassembleBaselineForProfiler())
+            m_disassembler->reportToProfiler(m_compilation.get(), patchBuffer);
+        m_vm->m_perBytecodeProfiler->addCompilation(m_codeBlock, *m_compilation);
     }
+
+    if (m_pcToCodeOriginMapBuilder.didBuildMapping())
+        m_codeBlock->setPCToCodeOriginMap(std::make_unique<PCToCodeOriginMap>(WTFMove(m_pcToCodeOriginMapBuilder), patchBuffer));
     
-    CodeRef result = patchBuffer.finalizeCodeWithoutDisassembly();
+    CodeRef result = FINALIZE_CODE(
+        patchBuffer,
+        ("Baseline JIT code for %s", toCString(CodeBlockWithJITType(m_codeBlock, JITCode::BaselineJIT)).data()));
     
-    m_vm->machineCodeBytesPerBytecodeWordForBaselineJIT.add(
+    m_vm->machineCodeBytesPerBytecodeWordForBaselineJIT->add(
         static_cast<double>(result.size()) /
-        static_cast<double>(m_codeBlock->instructions().size()));
-    
+        static_cast<double>(m_instructions.size()));
+
     m_codeBlock->shrinkToFit(CodeBlock::LateShrink);
     m_codeBlock->setJITCode(
-        adoptRef(new DirectJITCode(result, JITCode::BaselineJIT)),
-        withArityCheck);
-    
+        adoptRef(*new DirectJITCode(result, withArityCheck, JITCode::BaselineJIT)));
+
 #if ENABLE(JIT_VERBOSE)
     dataLogF("JIT generated code for %p at [%p, %p).\n", m_codeBlock, result.executableMemory()->start(), result.executableMemory()->end());
 #endif
@@ -697,72 +854,100 @@ CompilationResult JIT::privateCompile(JITCompilationEffort effort)
     return CompilationSuccessful;
 }
 
-void JIT::linkFor(ExecState* exec, JSFunction* callee, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, JIT::CodePtr code, CallLinkInfo* callLinkInfo, VM* vm, CodeSpecializationKind kind)
+CompilationResult JIT::privateCompile(JITCompilationEffort effort)
 {
-    RepatchBuffer repatchBuffer(callerCodeBlock);
-
-    ASSERT(!callLinkInfo->isLinked());
-    callLinkInfo->callee.set(*vm, callLinkInfo->hotPathBegin, callerCodeBlock->ownerExecutable(), callee);
-    callLinkInfo->lastSeenCallee.set(*vm, callerCodeBlock->ownerExecutable(), callee);
-    repatchBuffer.relink(callLinkInfo->hotPathOther, code);
-
-    if (calleeCodeBlock)
-        calleeCodeBlock->linkIncomingCall(exec, callLinkInfo);
-
-    // Patch the slow patch so we do not continue to try to link.
-    if (kind == CodeForCall) {
-        ASSERT(callLinkInfo->callType == CallLinkInfo::Call
-               || callLinkInfo->callType == CallLinkInfo::CallVarargs);
-        if (callLinkInfo->callType == CallLinkInfo::Call) {
-            repatchBuffer.relink(callLinkInfo->callReturnLocation, vm->getCTIStub(linkClosureCallThunkGenerator).code());
-            return;
-        }
-
-        repatchBuffer.relink(callLinkInfo->callReturnLocation, vm->getCTIStub(virtualCallThunkGenerator).code());
-        return;
-    }
-
-    ASSERT(kind == CodeForConstruct);
-    repatchBuffer.relink(callLinkInfo->callReturnLocation, vm->getCTIStub(virtualConstructThunkGenerator).code());
+    doMainThreadPreparationBeforeCompile();
+    compileWithoutLinking(effort);
+    return link();
 }
 
-void JIT::linkSlowCall(CodeBlock* callerCodeBlock, CallLinkInfo* callLinkInfo)
+void JIT::privateCompileExceptionHandlers()
 {
-    RepatchBuffer repatchBuffer(callerCodeBlock);
+    if (!m_exceptionChecksWithCallFrameRollback.empty()) {
+        m_exceptionChecksWithCallFrameRollback.link(this);
 
-    repatchBuffer.relink(callLinkInfo->callReturnLocation, callerCodeBlock->vm()->getCTIStub(virtualCallThunkGenerator).code());
-}
+        copyCalleeSavesToVMEntryFrameCalleeSavesBuffer();
 
-void JIT::privateCompileExceptionHandlers()
-{
-    if (m_exceptionChecks.empty() && m_exceptionChecksWithCallFrameRollback.empty())
-        return;
+        // lookupExceptionHandlerFromCallerFrame is passed two arguments, the VM and the exec (the CallFrame*).
 
-    Jump doLookup;
+        move(TrustedImmPtr(vm()), GPRInfo::argumentGPR0);
+        move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR1);
 
-    if (!m_exceptionChecksWithCallFrameRollback.empty()) {
-        m_exceptionChecksWithCallFrameRollback.link(this);
-        emitGetCallerFrameFromCallFrameHeaderPtr(GPRInfo::argumentGPR0);
-        doLookup = jump();
+#if CPU(X86)
+        // FIXME: should use the call abstraction, but this is currently in the SpeculativeJIT layer!
+        poke(GPRInfo::argumentGPR0);
+        poke(GPRInfo::argumentGPR1, 1);
+#endif
+        m_calls.append(CallRecord(call(), std::numeric_limits<unsigned>::max(), FunctionPtr(lookupExceptionHandlerFromCallerFrame).value()));
+        jumpToExceptionHandler();
     }
 
-    if (!m_exceptionChecks.empty())
+    if (!m_exceptionChecks.empty() || m_byValCompilationInfo.size()) {
+        m_exceptionHandler = label();
         m_exceptionChecks.link(this);
-    
-    // lookupExceptionHandler is passed one argument, the exec (the CallFrame*).
-    move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR0);
 
-    if (doLookup.isSet())
-        doLookup.link(this);
+        copyCalleeSavesToVMEntryFrameCalleeSavesBuffer();
+
+        // lookupExceptionHandler is passed two arguments, the VM and the exec (the CallFrame*).
+        move(TrustedImmPtr(vm()), GPRInfo::argumentGPR0);
+        move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR1);
 
 #if CPU(X86)
-    // FIXME: should use the call abstraction, but this is currently in the SpeculativeJIT layer!
-    poke(GPRInfo::argumentGPR0);
+        // FIXME: should use the call abstraction, but this is currently in the SpeculativeJIT layer!
+        poke(GPRInfo::argumentGPR0);
+        poke(GPRInfo::argumentGPR1, 1);
 #endif
-    m_calls.append(CallRecord(call(), (unsigned)-1, FunctionPtr(lookupExceptionHandler).value()));
-    jumpToExceptionHandler();
+        m_calls.append(CallRecord(call(), std::numeric_limits<unsigned>::max(), FunctionPtr(lookupExceptionHandler).value()));
+        jumpToExceptionHandler();
+    }
+}
+
+void JIT::doMainThreadPreparationBeforeCompile()
+{
+    // This ensures that we have the most up to date type information when performing typecheck optimizations for op_profile_type.
+    if (m_vm->typeProfiler())
+        m_vm->typeProfilerLog()->processLogEntries(ASCIILiteral("Preparing for JIT compilation."));
+}
+
+unsigned JIT::frameRegisterCountFor(CodeBlock* codeBlock)
+{
+    ASSERT(static_cast<unsigned>(codeBlock->m_numCalleeLocals) == WTF::roundUpToMultipleOf(stackAlignmentRegisters(), static_cast<unsigned>(codeBlock->m_numCalleeLocals)));
+
+    return roundLocalRegisterCountForFramePointerOffset(codeBlock->m_numCalleeLocals + maxFrameExtentForSlowPathCallInRegisters);
+}
+
+int JIT::stackPointerOffsetFor(CodeBlock* codeBlock)
+{
+    return virtualRegisterForLocal(frameRegisterCountFor(codeBlock) - 1).offset();
+}
+
+bool JIT::reportCompileTimes()
+{
+    return Options::reportCompileTimes() || Options::reportBaselineCompileTimes();
 }
 
+bool JIT::computeCompileTimes()
+{
+    return reportCompileTimes() || Options::reportTotalCompileTimes();
+}
+
+HashMap<CString, double> JIT::compileTimeStats()
+{
+    HashMap<CString, double> result;
+    if (Options::reportTotalCompileTimes()) {
+        result.add("Total Compile Time", totalBaselineCompileTime + totalDFGCompileTime + totalFTLCompileTime);
+        result.add("Baseline Compile Time", totalBaselineCompileTime);
+#if ENABLE(DFG_JIT)
+        result.add("DFG Compile Time", totalDFGCompileTime);
+#if ENABLE(FTL_JIT)
+        result.add("FTL Compile Time", totalFTLCompileTime);
+        result.add("FTL (DFG) Compile Time", totalFTLDFGCompileTime);
+        result.add("FTL (B3) Compile Time", totalFTLB3CompileTime);
+#endif // ENABLE(FTL_JIT)
+#endif // ENABLE(DFG_JIT)
+    }
+    return result;
+}
 
 } // namespace JSC