JavaScriptCore-7600.1.4.11.8.tar.gz

[apple/javascriptcore.git] / jit / JITPropertyAccess32_64.cpp

diff --git a/jit/JITPropertyAccess32_64.cpp b/jit/JITPropertyAccess32_64.cpp
index 3b3050e0bdd75b9c6c342fc54e38c4c185602e9d..88974f142aa2ae10b6294d631d71ece0721236f0 100644 (file)
--- a/jit/JITPropertyAccess32_64.cpp
+++ b/jit/JITPropertyAccess32_64.cpp
@@ -1,5 +1,5 @@
 /*
 /*

- * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2009, 2014 Apple Inc. All rights reserved.

  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions


@@ -30,263 +30,85 @@
 #include "JIT.h"
 
 #include "CodeBlock.h"
 #include "JIT.h"
 
 #include "CodeBlock.h"

-#include "JITInlineMethods.h"
-#include "JITStubCall.h"
+#include "GCAwareJITStubRoutine.h"
+#include "Interpreter.h"
+#include "JITInlines.h"

 #include "JSArray.h"
 #include "JSFunction.h"
 #include "JSPropertyNameIterator.h"
 #include "JSArray.h"
 #include "JSFunction.h"
 #include "JSPropertyNameIterator.h"

-#include "Interpreter.h"
+#include "JSVariableObject.h"

 #include "LinkBuffer.h"
 #include "RepatchBuffer.h"
 #include "ResultType.h"
 #include "SamplingTool.h"
 #include "LinkBuffer.h"
 #include "RepatchBuffer.h"
 #include "ResultType.h"
 #include "SamplingTool.h"

+#include <wtf/StringPrintStream.h>

 
 

-#ifndef NDEBUG
-#include <stdio.h>
-#endif
-
-using namespace std;

 
 namespace JSC {
     
 void JIT::emit_op_put_by_index(Instruction* currentInstruction)
 {
 
 namespace JSC {
     
 void JIT::emit_op_put_by_index(Instruction* currentInstruction)
 {

-    unsigned base = currentInstruction[1].u.operand;
-    unsigned property = currentInstruction[2].u.operand;
-    unsigned value = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_put_by_index);
-    stubCall.addArgument(base);
-    stubCall.addArgument(Imm32(property));
-    stubCall.addArgument(value);
-    stubCall.call();
-}
-
-void JIT::emit_op_put_getter(Instruction* currentInstruction)
-{
-    unsigned base = currentInstruction[1].u.operand;
-    unsigned property = currentInstruction[2].u.operand;
-    unsigned function = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_put_getter);
-    stubCall.addArgument(base);
-    stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(property)));
-    stubCall.addArgument(function);
-    stubCall.call();
-}
-
-void JIT::emit_op_put_setter(Instruction* currentInstruction)
-{
-    unsigned base = currentInstruction[1].u.operand;
-    unsigned property = currentInstruction[2].u.operand;
-    unsigned function = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_put_setter);
-    stubCall.addArgument(base);
-    stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(property)));
-    stubCall.addArgument(function);
-    stubCall.call();
-}
-
-void JIT::emit_op_del_by_id(Instruction* currentInstruction)
-{
-    unsigned dst = currentInstruction[1].u.operand;
-    unsigned base = currentInstruction[2].u.operand;
-    unsigned property = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_del_by_id);
-    stubCall.addArgument(base);
-    stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(property)));
-    stubCall.call(dst);
-}
-
-
-#if !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
-
-/* ------------------------------ BEGIN: !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS) ------------------------------ */
-
-// Treat these as nops - the call will be handed as a regular get_by_id/op_call pair.
-void JIT::emit_op_method_check(Instruction*) {}
-void JIT::emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&) { ASSERT_NOT_REACHED(); }
-#if ENABLE(JIT_OPTIMIZE_METHOD_CALLS)
-#error "JIT_OPTIMIZE_METHOD_CALLS requires JIT_OPTIMIZE_PROPERTY_ACCESS"
-#endif
-
-void JIT::emit_op_get_by_val(Instruction* currentInstruction)
-{
-    unsigned dst = currentInstruction[1].u.operand;
-    unsigned base = currentInstruction[2].u.operand;
-    unsigned property = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_get_by_val);
-    stubCall.addArgument(base);
-    stubCall.addArgument(property);
-    stubCall.call(dst);
-}
-
-void JIT::emitSlow_op_get_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&)
-{
-    ASSERT_NOT_REACHED();
-}
-
-void JIT::emit_op_put_by_val(Instruction* currentInstruction)
-{
-    unsigned base = currentInstruction[1].u.operand;
-    unsigned property = currentInstruction[2].u.operand;
-    unsigned value = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_put_by_val);
-    stubCall.addArgument(base);
-    stubCall.addArgument(property);
-    stubCall.addArgument(value);
-    stubCall.call();
-}
-
-void JIT::emitSlow_op_put_by_val(Instruction*, Vector<SlowCaseEntry>::iterator&)
-{
-    ASSERT_NOT_REACHED();
-}
+    int base = currentInstruction[1].u.operand;
+    int property = currentInstruction[2].u.operand;
+    int value = currentInstruction[3].u.operand;

 
 

-void JIT::emit_op_get_by_id(Instruction* currentInstruction)
-{
-    int dst = currentInstruction[1].u.operand;
-    int base = currentInstruction[2].u.operand;
-    int ident = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_get_by_id_generic);
-    stubCall.addArgument(base);
-    stubCall.addArgument(TrustedImmPtr(&(m_codeBlock->identifier(ident))));
-    stubCall.call(dst);
-    
-    m_propertyAccessInstructionIndex++;
+    emitLoad(base, regT1, regT0);
+    emitLoad(value, regT3, regT2);
+    callOperation(operationPutByIndex, regT1, regT0, property, regT3, regT2);

 }
 
 }
 

-void JIT::emitSlow_op_get_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&)
-{
-    m_propertyAccessInstructionIndex++;
-    ASSERT_NOT_REACHED();
-}
-
-void JIT::emit_op_put_by_id(Instruction* currentInstruction)
+void JIT::emit_op_put_getter_setter(Instruction* currentInstruction)

 {
     int base = currentInstruction[1].u.operand;
 {
     int base = currentInstruction[1].u.operand;

-    int ident = currentInstruction[2].u.operand;
-    int value = currentInstruction[3].u.operand;
-    
-    JITStubCall stubCall(this, cti_op_put_by_id_generic);
-    stubCall.addArgument(base);
-    stubCall.addArgument(TrustedImmPtr(&(m_codeBlock->identifier(ident))));
-    stubCall.addArgument(value);
-    stubCall.call();
-    
-    m_propertyAccessInstructionIndex++;
-}
+    int property = currentInstruction[2].u.operand;
+    int getter = currentInstruction[3].u.operand;
+    int setter = currentInstruction[4].u.operand;

 
 

-void JIT::emitSlow_op_put_by_id(Instruction*, Vector<SlowCaseEntry>::iterator&)
-{
-    m_propertyAccessInstructionIndex++;
-    ASSERT_NOT_REACHED();
+    emitLoadPayload(base, regT1);
+    emitLoadPayload(getter, regT3);
+    emitLoadPayload(setter, regT4);
+    callOperation(operationPutGetterSetter, regT1, &m_codeBlock->identifier(property), regT3, regT4);

 }
 
 }
 

-#else // !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
-
-/* ------------------------------ BEGIN: ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS) ------------------------------ */
-
-#if ENABLE(JIT_OPTIMIZE_METHOD_CALLS)
-
-void JIT::emit_op_method_check(Instruction* currentInstruction)
+void JIT::emit_op_del_by_id(Instruction* currentInstruction)

 {
 {

-    // Assert that the following instruction is a get_by_id.
-    ASSERT(m_interpreter->getOpcodeID((currentInstruction + OPCODE_LENGTH(op_method_check))->u.opcode) == op_get_by_id);
-    
-    currentInstruction += OPCODE_LENGTH(op_method_check);
-    
-    // Do the method check - check the object & its prototype's structure inline (this is the common case).
-    m_methodCallCompilationInfo.append(MethodCallCompilationInfo(m_propertyAccessInstructionIndex));
-    MethodCallCompilationInfo& info = m_methodCallCompilationInfo.last();
-    

     int dst = currentInstruction[1].u.operand;
     int base = currentInstruction[2].u.operand;
     int dst = currentInstruction[1].u.operand;
     int base = currentInstruction[2].u.operand;

-    
+    int property = currentInstruction[3].u.operand;

     emitLoad(base, regT1, regT0);
     emitLoad(base, regT1, regT0);

-    emitJumpSlowCaseIfNotJSCell(base, regT1);
-    
-    BEGIN_UNINTERRUPTED_SEQUENCE(sequenceMethodCheck);
-    
-    Jump structureCheck = branchPtrWithPatch(NotEqual, Address(regT0, JSCell::structureOffset()), info.structureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure)));
-    DataLabelPtr protoStructureToCompare, protoObj = moveWithPatch(TrustedImmPtr(0), regT2);
-    Jump protoStructureCheck = branchPtrWithPatch(NotEqual, Address(regT2, JSCell::structureOffset()), protoStructureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure)));
-    
-    // This will be relinked to load the function without doing a load.
-    DataLabelPtr putFunction = moveWithPatch(TrustedImmPtr(0), regT0);
-    
-    END_UNINTERRUPTED_SEQUENCE(sequenceMethodCheck);
-    
-    move(TrustedImm32(JSValue::CellTag), regT1);
-    Jump match = jump();
-    
-    ASSERT_JIT_OFFSET(differenceBetween(info.structureToCompare, protoObj), patchOffsetMethodCheckProtoObj);
-    ASSERT_JIT_OFFSET(differenceBetween(info.structureToCompare, protoStructureToCompare), patchOffsetMethodCheckProtoStruct);
-    ASSERT_JIT_OFFSET(differenceBetween(info.structureToCompare, putFunction), patchOffsetMethodCheckPutFunction);
-    
-    // Link the failure cases here.
-    structureCheck.link(this);
-    protoStructureCheck.link(this);
-    
-    // Do a regular(ish) get_by_id (the slow case will be link to
-    // cti_op_get_by_id_method_check instead of cti_op_get_by_id.
-    compileGetByIdHotPath();
-    
-    match.link(this);
-    emitStore(dst, regT1, regT0);
-    map(m_bytecodeOffset + OPCODE_LENGTH(op_method_check), dst, regT1, regT0);
-    
-    // We've already generated the following get_by_id, so make sure it's skipped over.
-    m_bytecodeOffset += OPCODE_LENGTH(op_get_by_id);
-}
-
-void JIT::emitSlow_op_method_check(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
-{
-    currentInstruction += OPCODE_LENGTH(op_method_check);
-    
-    int dst = currentInstruction[1].u.operand;
-    int base = currentInstruction[2].u.operand;
-    int ident = currentInstruction[3].u.operand;
-    
-    compileGetByIdSlowCase(dst, base, &(m_codeBlock->identifier(ident)), iter, true);
-    
-    // We've already generated the following get_by_id, so make sure it's skipped over.
-    m_bytecodeOffset += OPCODE_LENGTH(op_get_by_id);
+    callOperation(operationDeleteById, dst, regT1, regT0, &m_codeBlock->identifier(property));

 }
 
 }
 

-#else //!ENABLE(JIT_OPTIMIZE_METHOD_CALLS)
-
-// Treat these as nops - the call will be handed as a regular get_by_id/op_call pair.
-void JIT::emit_op_method_check(Instruction*) {}
-void JIT::emitSlow_op_method_check(Instruction*, Vector<SlowCaseEntry>::iterator&) { ASSERT_NOT_REACHED(); }
-
-#endif
-
-JIT::CodePtr JIT::stringGetByValStubGenerator(JSGlobalData* globalData, ExecutablePool* pool)
+JIT::CodeRef JIT::stringGetByValStubGenerator(VM* vm)

 {
 {

-    JSInterfaceJIT jit;
+    JSInterfaceJIT jit(vm);

     JumpList failures;
     JumpList failures;

-    failures.append(jit.branchPtr(NotEqual, Address(regT0), TrustedImmPtr(globalData->jsStringVPtr)));
-    failures.append(jit.branchTest32(NonZero, Address(regT0, OBJECT_OFFSETOF(JSString, m_fiberCount))));
+    failures.append(JSC::branchStructure(jit, NotEqual, Address(regT0, JSCell::structureIDOffset()), vm->stringStructure.get()));

     
     // Load string length to regT1, and start the process of loading the data pointer into regT0
     jit.load32(Address(regT0, ThunkHelpers::jsStringLengthOffset()), regT1);
     jit.loadPtr(Address(regT0, ThunkHelpers::jsStringValueOffset()), regT0);
     
     // Load string length to regT1, and start the process of loading the data pointer into regT0
     jit.load32(Address(regT0, ThunkHelpers::jsStringLengthOffset()), regT1);
     jit.loadPtr(Address(regT0, ThunkHelpers::jsStringValueOffset()), regT0);

-    jit.loadPtr(Address(regT0, ThunkHelpers::stringImplDataOffset()), regT0);
+    failures.append(jit.branchTest32(Zero, regT0));

     
     // Do an unsigned compare to simultaneously filter negative indices as well as indices that are too large
     failures.append(jit.branch32(AboveOrEqual, regT2, regT1));
     
     // Load the character
     
     // Do an unsigned compare to simultaneously filter negative indices as well as indices that are too large
     failures.append(jit.branch32(AboveOrEqual, regT2, regT1));
     
     // Load the character

+    JumpList is16Bit;
+    JumpList cont8Bit;
+    // Load the string flags
+    jit.loadPtr(Address(regT0, StringImpl::flagsOffset()), regT1);
+    jit.loadPtr(Address(regT0, StringImpl::dataOffset()), regT0);
+    is16Bit.append(jit.branchTest32(Zero, regT1, TrustedImm32(StringImpl::flagIs8Bit())));
+    jit.load8(BaseIndex(regT0, regT2, TimesOne, 0), regT0);
+    cont8Bit.append(jit.jump());
+    is16Bit.link(&jit);

     jit.load16(BaseIndex(regT0, regT2, TimesTwo, 0), regT0);
     jit.load16(BaseIndex(regT0, regT2, TimesTwo, 0), regT0);

+
+    cont8Bit.link(&jit);

     
     failures.append(jit.branch32(AboveOrEqual, regT0, TrustedImm32(0x100)));
     
     failures.append(jit.branch32(AboveOrEqual, regT0, TrustedImm32(0x100)));

-    jit.move(TrustedImmPtr(globalData->smallStrings.singleCharacterStrings()), regT1);
+    jit.move(TrustedImmPtr(vm->smallStrings.singleCharacterStrings()), regT1);

     jit.loadPtr(BaseIndex(regT1, regT0, ScalePtr, 0), regT0);
     jit.move(TrustedImm32(JSValue::CellTag), regT1); // We null check regT0 on return so this is safe
     jit.ret();
     jit.loadPtr(BaseIndex(regT1, regT0, ScalePtr, 0), regT0);
     jit.move(TrustedImm32(JSValue::CellTag), regT1); // We null check regT0 on return so this is safe
     jit.ret();


@@ -295,77 +117,269 @@ JIT::CodePtr JIT::stringGetByValStubGenerator(JSGlobalData* globalData, Executab
     jit.move(TrustedImm32(0), regT0);
     jit.ret();
     
     jit.move(TrustedImm32(0), regT0);
     jit.ret();
     

-    LinkBuffer patchBuffer(*globalData, &jit, pool);
-    return patchBuffer.finalizeCode().m_code;
+    LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
+    return FINALIZE_CODE(patchBuffer, ("String get_by_val stub"));

 }
 
 void JIT::emit_op_get_by_val(Instruction* currentInstruction)
 {
 }
 
 void JIT::emit_op_get_by_val(Instruction* currentInstruction)
 {

-    unsigned dst = currentInstruction[1].u.operand;
-    unsigned base = currentInstruction[2].u.operand;
-    unsigned property = currentInstruction[3].u.operand;
+    int dst = currentInstruction[1].u.operand;
+    int base = currentInstruction[2].u.operand;
+    int property = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;

     
     emitLoad2(base, regT1, regT0, property, regT3, regT2);
     
     addSlowCase(branch32(NotEqual, regT3, TrustedImm32(JSValue::Int32Tag)));
     emitJumpSlowCaseIfNotJSCell(base, regT1);
     
     emitLoad2(base, regT1, regT0, property, regT3, regT2);
     
     addSlowCase(branch32(NotEqual, regT3, TrustedImm32(JSValue::Int32Tag)));
     emitJumpSlowCaseIfNotJSCell(base, regT1);

-    addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsArrayVPtr)));
+    emitArrayProfilingSiteWithCell(regT0, regT1, profile);
+    and32(TrustedImm32(IndexingShapeMask), regT1);
+
+    PatchableJump badType;
+    JumpList slowCases;
+    
+    JITArrayMode mode = chooseArrayMode(profile);
+    switch (mode) {
+    case JITInt32:
+        slowCases = emitInt32GetByVal(currentInstruction, badType);
+        break;
+    case JITDouble:
+        slowCases = emitDoubleGetByVal(currentInstruction, badType);
+        break;
+    case JITContiguous:
+        slowCases = emitContiguousGetByVal(currentInstruction, badType);
+        break;
+    case JITArrayStorage:
+        slowCases = emitArrayStorageGetByVal(currentInstruction, badType);
+        break;
+    default:
+        CRASH();
+    }

     
     

-    loadPtr(Address(regT0, JSArray::storageOffset()), regT3);
-    addSlowCase(branch32(AboveOrEqual, regT2, Address(regT0, JSArray::vectorLengthOffset())));
+    addSlowCase(badType);
+    addSlowCase(slowCases);
+    
+    Label done = label();
+
+    if (!ASSERT_DISABLED) {
+        Jump resultOK = branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag));
+        abortWithReason(JITGetByValResultIsNotEmpty);
+        resultOK.link(this);
+    }
+
+    emitValueProfilingSite();
+    emitStore(dst, regT1, regT0);
+    
+    m_byValCompilationInfo.append(ByValCompilationInfo(m_bytecodeOffset, badType, mode, done));
+}
+
+JIT::JumpList JIT::emitContiguousGetByVal(Instruction*, PatchableJump& badType, IndexingType expectedShape)
+{
+    JumpList slowCases;
+    
+    badType = patchableBranch32(NotEqual, regT1, TrustedImm32(expectedShape));
+    
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT3);
+    slowCases.append(branch32(AboveOrEqual, regT2, Address(regT3, Butterfly::offsetOfPublicLength())));
+    
+    load32(BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1); // tag
+    load32(BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0); // payload
+    slowCases.append(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitDoubleGetByVal(Instruction*, PatchableJump& badType)
+{
+    JumpList slowCases;
+    
+    badType = patchableBranch32(NotEqual, regT1, TrustedImm32(DoubleShape));
+    
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT3);
+    slowCases.append(branch32(AboveOrEqual, regT2, Address(regT3, Butterfly::offsetOfPublicLength())));
+    
+    loadDouble(BaseIndex(regT3, regT2, TimesEight), fpRegT0);
+    slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
+    moveDoubleToInts(fpRegT0, regT0, regT1);
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitArrayStorageGetByVal(Instruction*, PatchableJump& badType)
+{
+    JumpList slowCases;
+    
+    add32(TrustedImm32(-ArrayStorageShape), regT1, regT3);
+    badType = patchableBranch32(Above, regT3, TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape));
+    
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT3);
+    slowCases.append(branch32(AboveOrEqual, regT2, Address(regT3, ArrayStorage::vectorLengthOffset())));

     
     load32(BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1); // tag
     load32(BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0); // payload
     
     load32(BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1); // tag
     load32(BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0); // payload

-    addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));
+    slowCases.append(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));

     
     

-    emitStore(dst, regT1, regT0);
-    map(m_bytecodeOffset + OPCODE_LENGTH(op_get_by_val), dst, regT1, regT0);
+    return slowCases;

 }
 }

-
+    

 void JIT::emitSlow_op_get_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
 void JIT::emitSlow_op_get_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {

-    unsigned dst = currentInstruction[1].u.operand;
-    unsigned base = currentInstruction[2].u.operand;
-    unsigned property = currentInstruction[3].u.operand;
+    int dst = currentInstruction[1].u.operand;
+    int base = currentInstruction[2].u.operand;
+    int property = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;

     
     linkSlowCase(iter); // property int32 check
     linkSlowCaseIfNotJSCell(iter, base); // base cell check
 
     Jump nonCell = jump();
     linkSlowCase(iter); // base array check
     
     linkSlowCase(iter); // property int32 check
     linkSlowCaseIfNotJSCell(iter, base); // base cell check
 
     Jump nonCell = jump();
     linkSlowCase(iter); // base array check

-    Jump notString = branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsStringVPtr));
-    emitNakedCall(m_globalData->getCTIStub(stringGetByValStubGenerator));
+    Jump notString = branchStructure(NotEqual, Address(regT0, JSCell::structureIDOffset()), m_vm->stringStructure.get());
+    emitNakedCall(m_vm->getCTIStub(stringGetByValStubGenerator).code());

     Jump failed = branchTestPtr(Zero, regT0);
     emitStore(dst, regT1, regT0);
     emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_get_by_val));
     failed.link(this);
     notString.link(this);
     nonCell.link(this);
     Jump failed = branchTestPtr(Zero, regT0);
     emitStore(dst, regT1, regT0);
     emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_get_by_val));
     failed.link(this);
     notString.link(this);
     nonCell.link(this);

+    
+    Jump skipProfiling = jump();

 
     linkSlowCase(iter); // vector length check
     linkSlowCase(iter); // empty value
     
 
     linkSlowCase(iter); // vector length check
     linkSlowCase(iter); // empty value
     

-    JITStubCall stubCall(this, cti_op_get_by_val);
-    stubCall.addArgument(base);
-    stubCall.addArgument(property);
-    stubCall.call(dst);
+    emitArrayProfileOutOfBoundsSpecialCase(profile);
+    
+    skipProfiling.link(this);
+    
+    Label slowPath = label();
+    
+    emitLoad(base, regT1, regT0);
+    emitLoad(property, regT3, regT2);
+    Call call = callOperation(operationGetByValDefault, dst, regT1, regT0, regT3, regT2);
+
+    m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
+    m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
+    m_byValInstructionIndex++;
+
+    emitValueProfilingSite();

 }
 
 void JIT::emit_op_put_by_val(Instruction* currentInstruction)
 {
 }
 
 void JIT::emit_op_put_by_val(Instruction* currentInstruction)
 {

-    unsigned base = currentInstruction[1].u.operand;
-    unsigned property = currentInstruction[2].u.operand;
-    unsigned value = currentInstruction[3].u.operand;
+    int base = currentInstruction[1].u.operand;
+    int property = currentInstruction[2].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;

     
     emitLoad2(base, regT1, regT0, property, regT3, regT2);
     
     addSlowCase(branch32(NotEqual, regT3, TrustedImm32(JSValue::Int32Tag)));
     emitJumpSlowCaseIfNotJSCell(base, regT1);
     
     emitLoad2(base, regT1, regT0, property, regT3, regT2);
     
     addSlowCase(branch32(NotEqual, regT3, TrustedImm32(JSValue::Int32Tag)));
     emitJumpSlowCaseIfNotJSCell(base, regT1);

-    addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsArrayVPtr)));
-    addSlowCase(branch32(AboveOrEqual, regT2, Address(regT0, JSArray::vectorLengthOffset())));
+    emitArrayProfilingSiteWithCell(regT0, regT1, profile);
+    and32(TrustedImm32(IndexingShapeMask), regT1);
+    
+    PatchableJump badType;
+    JumpList slowCases;
+    
+    JITArrayMode mode = chooseArrayMode(profile);
+    switch (mode) {
+    case JITInt32:
+        slowCases = emitInt32PutByVal(currentInstruction, badType);
+        break;
+    case JITDouble:
+        slowCases = emitDoublePutByVal(currentInstruction, badType);
+        break;
+    case JITContiguous:
+        slowCases = emitContiguousPutByVal(currentInstruction, badType);
+        break;
+    case JITArrayStorage:
+        slowCases = emitArrayStoragePutByVal(currentInstruction, badType);
+        break;
+    default:
+        CRASH();
+        break;
+    }
+    
+    addSlowCase(badType);
+    addSlowCase(slowCases);
+    
+    Label done = label();
+    
+    m_byValCompilationInfo.append(ByValCompilationInfo(m_bytecodeOffset, badType, mode, done));
+}
+
+JIT::JumpList JIT::emitGenericContiguousPutByVal(Instruction* currentInstruction, PatchableJump& badType, IndexingType indexingShape)
+{
+    int base = currentInstruction[1].u.operand;
+    int value = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;

     
     

-    loadPtr(Address(regT0, JSArray::storageOffset()), regT3);
+    JumpList slowCases;

     
     

+    badType = patchableBranch32(NotEqual, regT1, TrustedImm32(ContiguousShape));
+    
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT3);
+    Jump outOfBounds = branch32(AboveOrEqual, regT2, Address(regT3, Butterfly::offsetOfPublicLength()));
+    
+    Label storeResult = label();
+    emitLoad(value, regT1, regT0);
+    switch (indexingShape) {
+    case Int32Shape:
+        slowCases.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::Int32Tag)));
+        store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
+        store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
+        break;
+    case ContiguousShape:
+        store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload)));
+        store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag)));
+        emitLoad(base, regT2, regT3);
+        emitWriteBarrier(base, value, ShouldFilterValue);
+        break;
+    case DoubleShape: {
+        Jump notInt = branch32(NotEqual, regT1, TrustedImm32(JSValue::Int32Tag));
+        convertInt32ToDouble(regT0, fpRegT0);
+        Jump ready = jump();
+        notInt.link(this);
+        moveIntsToDouble(regT0, regT1, fpRegT0, fpRegT1);
+        slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
+        ready.link(this);
+        storeDouble(fpRegT0, BaseIndex(regT3, regT2, TimesEight));
+        break;
+    }
+    default:
+        CRASH();
+        break;
+    }
+        
+    Jump done = jump();
+    
+    outOfBounds.link(this);
+    slowCases.append(branch32(AboveOrEqual, regT2, Address(regT3, Butterfly::offsetOfVectorLength())));
+    
+    emitArrayProfileStoreToHoleSpecialCase(profile);
+    
+    add32(TrustedImm32(1), regT2, regT1);
+    store32(regT1, Address(regT3, Butterfly::offsetOfPublicLength()));
+    jump().linkTo(storeResult, this);
+    
+    done.link(this);
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitArrayStoragePutByVal(Instruction* currentInstruction, PatchableJump& badType)
+{
+    int base = currentInstruction[1].u.operand;
+    int value = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    
+    JumpList slowCases;
+    
+    badType = patchableBranch32(NotEqual, regT1, TrustedImm32(ArrayStorageShape));
+    
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT3);
+    slowCases.append(branch32(AboveOrEqual, regT2, Address(regT3, ArrayStorage::vectorLengthOffset())));
+

     Jump empty = branch32(Equal, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::EmptyValueTag));
     
     Label storeResult(this);
     Jump empty = branch32(Equal, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::EmptyValueTag));
     
     Label storeResult(this);


@@ -375,113 +389,120 @@ void JIT::emit_op_put_by_val(Instruction* currentInstruction)
     Jump end = jump();
     
     empty.link(this);
     Jump end = jump();
     
     empty.link(this);

+    emitArrayProfileStoreToHoleSpecialCase(profile);

     add32(TrustedImm32(1), Address(regT3, OBJECT_OFFSETOF(ArrayStorage, m_numValuesInVector)));
     add32(TrustedImm32(1), Address(regT3, OBJECT_OFFSETOF(ArrayStorage, m_numValuesInVector)));

-    branch32(Below, regT2, Address(regT3, OBJECT_OFFSETOF(ArrayStorage, m_length))).linkTo(storeResult, this);
+    branch32(Below, regT2, Address(regT3, ArrayStorage::lengthOffset())).linkTo(storeResult, this);

     
     add32(TrustedImm32(1), regT2, regT0);
     
     add32(TrustedImm32(1), regT2, regT0);

-    store32(regT0, Address(regT3, OBJECT_OFFSETOF(ArrayStorage, m_length)));
+    store32(regT0, Address(regT3, ArrayStorage::lengthOffset()));

     jump().linkTo(storeResult, this);
     
     end.link(this);
     jump().linkTo(storeResult, this);
     
     end.link(this);

+    
+    emitWriteBarrier(base, value, ShouldFilterValue);
+    
+    return slowCases;

 }
 
 void JIT::emitSlow_op_put_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
 }
 
 void JIT::emitSlow_op_put_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {

-    unsigned base = currentInstruction[1].u.operand;
-    unsigned property = currentInstruction[2].u.operand;
-    unsigned value = currentInstruction[3].u.operand;
+    int base = currentInstruction[1].u.operand;
+    int property = currentInstruction[2].u.operand;
+    int value = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;

     
     linkSlowCase(iter); // property int32 check
     linkSlowCaseIfNotJSCell(iter, base); // base cell check
     linkSlowCase(iter); // base not array check
     
     linkSlowCase(iter); // property int32 check
     linkSlowCaseIfNotJSCell(iter, base); // base cell check
     linkSlowCase(iter); // base not array check

-    linkSlowCase(iter); // in vector check

     
     

-    JITStubCall stubPutByValCall(this, cti_op_put_by_val);
-    stubPutByValCall.addArgument(base);
-    stubPutByValCall.addArgument(property);
-    stubPutByValCall.addArgument(value);
-    stubPutByValCall.call();
+    JITArrayMode mode = chooseArrayMode(profile);
+    switch (mode) {
+    case JITInt32:
+    case JITDouble:
+        linkSlowCase(iter); // value type check
+        break;
+    default:
+        break;
+    }
+    
+    Jump skipProfiling = jump();
+    linkSlowCase(iter); // out of bounds
+    emitArrayProfileOutOfBoundsSpecialCase(profile);
+    skipProfiling.link(this);
+
+    Label slowPath = label();
+    
+    bool isDirect = m_interpreter->getOpcodeID(currentInstruction->u.opcode) == op_put_by_val_direct;
+
+#if CPU(X86)
+    // FIXME: We only have 5 temp registers, but need 6 to make this call, therefore we materialize
+    // our own call. When we finish moving JSC to the C call stack, we'll get another register so
+    // we can use the normal case.
+    resetCallArguments();
+    addCallArgument(GPRInfo::callFrameRegister);
+    emitLoad(base, regT0, regT1);
+    addCallArgument(regT1);
+    addCallArgument(regT0);
+    emitLoad(property, regT0, regT1);
+    addCallArgument(regT1);
+    addCallArgument(regT0);
+    emitLoad(value, regT0, regT1);
+    addCallArgument(regT1);
+    addCallArgument(regT0);
+    Call call = appendCallWithExceptionCheck(isDirect ? operationDirectPutByVal : operationPutByVal);
+#else
+    // The register selection below is chosen to reduce register swapping on ARM.
+    // Swapping shouldn't happen on other platforms.
+    emitLoad(base, regT2, regT1);
+    emitLoad(property, regT3, regT0);
+    emitLoad(value, regT5, regT4);
+    Call call = callOperation(isDirect ? operationDirectPutByVal : operationPutByVal, regT2, regT1, regT3, regT0, regT5, regT4);
+#endif
+
+    m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
+    m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
+    m_byValInstructionIndex++;

 }
 
 void JIT::emit_op_get_by_id(Instruction* currentInstruction)
 {
     int dst = currentInstruction[1].u.operand;
     int base = currentInstruction[2].u.operand;
 }
 
 void JIT::emit_op_get_by_id(Instruction* currentInstruction)
 {
     int dst = currentInstruction[1].u.operand;
     int base = currentInstruction[2].u.operand;

+    const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));

     
     emitLoad(base, regT1, regT0);
     emitJumpSlowCaseIfNotJSCell(base, regT1);
     
     emitLoad(base, regT1, regT0);
     emitJumpSlowCaseIfNotJSCell(base, regT1);

-    compileGetByIdHotPath();
-    emitStore(dst, regT1, regT0);
-    map(m_bytecodeOffset + OPCODE_LENGTH(op_get_by_id), dst, regT1, regT0);
-}

 
 

-void JIT::compileGetByIdHotPath()
-{
-    // As for put_by_id, get_by_id requires the offset of the Structure and the offset of the access to be patched.
-    // Additionally, for get_by_id we need patch the offset of the branch to the slow case (we patch this to jump
-    // to array-length / prototype access tranpolines, and finally we also the the property-map access offset as a label
-    // to jump back to if one of these trampolies finds a match.
-    
-    BEGIN_UNINTERRUPTED_SEQUENCE(sequenceGetByIdHotPath);
-    
-    Label hotPathBegin(this);
-    m_propertyAccessCompilationInfo[m_propertyAccessInstructionIndex].hotPathBegin = hotPathBegin;
-    m_propertyAccessInstructionIndex++;
-    
-    DataLabelPtr structureToCompare;
-    Jump structureCheck = branchPtrWithPatch(NotEqual, Address(regT0, JSCell::structureOffset()), structureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure)));
-    addSlowCase(structureCheck);
-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, structureToCompare), patchOffsetGetByIdStructure);
-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, structureCheck), patchOffsetGetByIdBranchToSlowCase);
-    
-    loadPtr(Address(regT0, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), regT2);
-    DataLabelCompact displacementLabel1 = loadPtrWithCompactAddressOffsetPatch(Address(regT2, patchGetByIdDefaultOffset), regT0); // payload
-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, displacementLabel1), patchOffsetGetByIdPropertyMapOffset1);
-    DataLabelCompact displacementLabel2 = loadPtrWithCompactAddressOffsetPatch(Address(regT2, patchGetByIdDefaultOffset), regT1); // tag
-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, displacementLabel2), patchOffsetGetByIdPropertyMapOffset2);
-    
-    Label putResult(this);
-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, putResult), patchOffsetGetByIdPutResult);
-    
-    END_UNINTERRUPTED_SEQUENCE(sequenceGetByIdHotPath);
+    if (*ident == m_vm->propertyNames->length && shouldEmitProfiling())
+        emitArrayProfilingSiteForBytecodeIndexWithCell(regT0, regT2, m_bytecodeOffset);
+
+    JITGetByIdGenerator gen(
+        m_codeBlock, CodeOrigin(m_bytecodeOffset), RegisterSet::specialRegisters(),
+        JSValueRegs::payloadOnly(regT0), JSValueRegs(regT1, regT0), DontSpill);
+    gen.generateFastPath(*this);
+    addSlowCase(gen.slowPathJump());
+    m_getByIds.append(gen);
+
+    emitValueProfilingSite();
+    emitStore(dst, regT1, regT0);

 }
 
 void JIT::emitSlow_op_get_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
 }
 
 void JIT::emitSlow_op_get_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {

-    int dst = currentInstruction[1].u.operand;
-    int base = currentInstruction[2].u.operand;
-    int ident = currentInstruction[3].u.operand;
-    
-    compileGetByIdSlowCase(dst, base, &(m_codeBlock->identifier(ident)), iter);
-}
+    int resultVReg = currentInstruction[1].u.operand;
+    int baseVReg = currentInstruction[2].u.operand;
+    const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));

 
 

-void JIT::compileGetByIdSlowCase(int dst, int base, Identifier* ident, Vector<SlowCaseEntry>::iterator& iter, bool isMethodCheck)
-{
-    // As for the hot path of get_by_id, above, we ensure that we can use an architecture specific offset
-    // so that we only need track one pointer into the slow case code - we track a pointer to the location
-    // of the call (which we can use to look up the patch information), but should a array-length or
-    // prototype access trampoline fail we want to bail out back to here.  To do so we can subtract back
-    // the distance from the call to the head of the slow case.
-    linkSlowCaseIfNotJSCell(iter, base);
+    linkSlowCaseIfNotJSCell(iter, baseVReg);

     linkSlowCase(iter);
     linkSlowCase(iter);

+
+    JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++];

     
     

-    BEGIN_UNINTERRUPTED_SEQUENCE(sequenceGetByIdSlowCase);
-    
-#ifndef NDEBUG
-    Label coldPathBegin(this);
-#endif
-    JITStubCall stubCall(this, isMethodCheck ? cti_op_get_by_id_method_check : cti_op_get_by_id);
-    stubCall.addArgument(regT1, regT0);
-    stubCall.addArgument(TrustedImmPtr(ident));
-    Call call = stubCall.call(dst);
-    
-    END_UNINTERRUPTED_SEQUENCE_FOR_PUT(sequenceGetByIdSlowCase, dst);
+    Label coldPathBegin = label();

     
     

-    ASSERT_JIT_OFFSET(differenceBetween(coldPathBegin, call), patchOffsetGetByIdSlowCaseCall);
+    Call call = callOperation(WithProfile, operationGetByIdOptimize, resultVReg, gen.stubInfo(), regT1, regT0, ident->impl());

     
     

-    // Track the location of the call; this will be used to recover patch information.
-    m_propertyAccessCompilationInfo[m_propertyAccessInstructionIndex].callReturnLocation = call;
-    m_propertyAccessInstructionIndex++;
+    gen.reportSlowPathCall(coldPathBegin, call);

 }
 
 void JIT::emit_op_put_by_id(Instruction* currentInstruction)
 }
 
 void JIT::emit_op_put_by_id(Instruction* currentInstruction)


@@ -492,620 +513,395 @@ void JIT::emit_op_put_by_id(Instruction* currentInstruction)
     
     int base = currentInstruction[1].u.operand;
     int value = currentInstruction[3].u.operand;
     
     int base = currentInstruction[1].u.operand;
     int value = currentInstruction[3].u.operand;

+    int direct = currentInstruction[8].u.operand;

     
     

+    emitWriteBarrier(base, value, ShouldFilterBase);
+

     emitLoad2(base, regT1, regT0, value, regT3, regT2);
     
     emitJumpSlowCaseIfNotJSCell(base, regT1);
     
     emitLoad2(base, regT1, regT0, value, regT3, regT2);
     
     emitJumpSlowCaseIfNotJSCell(base, regT1);
     

-    BEGIN_UNINTERRUPTED_SEQUENCE(sequencePutById);
-    
-    Label hotPathBegin(this);
-    m_propertyAccessCompilationInfo[m_propertyAccessInstructionIndex].hotPathBegin = hotPathBegin;
-    m_propertyAccessInstructionIndex++;
-    
-    // It is important that the following instruction plants a 32bit immediate, in order that it can be patched over.
-    DataLabelPtr structureToCompare;
-    addSlowCase(branchPtrWithPatch(NotEqual, Address(regT0, JSCell::structureOffset()), structureToCompare, TrustedImmPtr(reinterpret_cast<void*>(patchGetByIdDefaultStructure))));
-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, structureToCompare), patchOffsetPutByIdStructure);
-    
-    loadPtr(Address(regT0, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), regT0);
-    DataLabel32 displacementLabel1 = storePtrWithAddressOffsetPatch(regT2, Address(regT0, patchPutByIdDefaultOffset)); // payload
-    DataLabel32 displacementLabel2 = storePtrWithAddressOffsetPatch(regT3, Address(regT0, patchPutByIdDefaultOffset)); // tag
+    emitLoad(base, regT1, regT0);
+    emitLoad(value, regT3, regT2);
+
+    JITPutByIdGenerator gen(
+        m_codeBlock, CodeOrigin(m_bytecodeOffset), RegisterSet::specialRegisters(),
+        JSValueRegs::payloadOnly(regT0), JSValueRegs(regT3, regT2),
+        regT1, DontSpill, m_codeBlock->ecmaMode(), direct ? Direct : NotDirect);

     
     

-    END_UNINTERRUPTED_SEQUENCE(sequencePutById);
+    gen.generateFastPath(*this);
+    addSlowCase(gen.slowPathJump());

     
     

-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, displacementLabel1), patchOffsetPutByIdPropertyMapOffset1);
-    ASSERT_JIT_OFFSET(differenceBetween(hotPathBegin, displacementLabel2), patchOffsetPutByIdPropertyMapOffset2);
+    m_putByIds.append(gen);

 }
 
 void JIT::emitSlow_op_put_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     int base = currentInstruction[1].u.operand;
 }
 
 void JIT::emitSlow_op_put_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 {
     int base = currentInstruction[1].u.operand;

-    int ident = currentInstruction[2].u.operand;
-    int direct = currentInstruction[8].u.operand;
+    const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[2].u.operand));

 
     linkSlowCaseIfNotJSCell(iter, base);
     linkSlowCase(iter);
     
 
     linkSlowCaseIfNotJSCell(iter, base);
     linkSlowCase(iter);
     

-    JITStubCall stubCall(this, direct ? cti_op_put_by_id_direct : cti_op_put_by_id);
-    stubCall.addArgument(regT1, regT0);
-    stubCall.addArgument(TrustedImmPtr(&(m_codeBlock->identifier(ident))));
-    stubCall.addArgument(regT3, regT2); 
-    Call call = stubCall.call();
+    Label coldPathBegin(this);
+    
+    JITPutByIdGenerator& gen = m_putByIds[m_putByIdIndex++];

     
     

-    // Track the location of the call; this will be used to recover patch information.
-    m_propertyAccessCompilationInfo[m_propertyAccessInstructionIndex].callReturnLocation = call;
-    m_propertyAccessInstructionIndex++;
+    Call call = callOperation(
+        gen.slowPathFunction(), gen.stubInfo(), regT3, regT2, regT1, regT0, ident->impl());
+    
+    gen.reportSlowPathCall(coldPathBegin, call);

 }
 
 // Compile a store into an object's property storage.  May overwrite base.
 }
 
 // Compile a store into an object's property storage.  May overwrite base.

-void JIT::compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, Structure* structure, size_t cachedOffset)
+void JIT::compilePutDirectOffset(RegisterID base, RegisterID valueTag, RegisterID valuePayload, PropertyOffset cachedOffset)

 {
 {

-    int offset = cachedOffset;
-    if (structure->isUsingInlineStorage())
-        offset += JSObject::offsetOfInlineStorage() /  sizeof(Register);
-    else
-        loadPtr(Address(base, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), base);
-    emitStore(offset, valueTag, valuePayload, base);
+    if (isOutOfLineOffset(cachedOffset))
+        loadPtr(Address(base, JSObject::butterflyOffset()), base);
+    emitStore(indexRelativeToBase(cachedOffset), valueTag, valuePayload, base);

 }
 
 // Compile a load from an object's property storage.  May overwrite base.
 }
 
 // Compile a load from an object's property storage.  May overwrite base.

-void JIT::compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, Structure* structure, size_t cachedOffset)
+void JIT::compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, PropertyOffset cachedOffset)

 {
 {

-    int offset = cachedOffset;
-    if (structure->isUsingInlineStorage()) {
-        offset += JSObject::offsetOfInlineStorage() / sizeof(Register);
-        emitLoad(offset, resultTag, resultPayload, base);
-    } else {
-        RegisterID temp = resultPayload;
-        loadPtr(Address(base, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), temp);
-        emitLoad(offset, resultTag, resultPayload, temp);
+    if (isInlineOffset(cachedOffset)) {
+        emitLoad(indexRelativeToBase(cachedOffset), resultTag, resultPayload, base);
+        return;

     }
     }

+    
+    RegisterID temp = resultPayload;
+    loadPtr(Address(base, JSObject::butterflyOffset()), temp);
+    emitLoad(indexRelativeToBase(cachedOffset), resultTag, resultPayload, temp);

 }
 
 }
 

-void JIT::compileGetDirectOffset(JSObject* base, RegisterID resultTag, RegisterID resultPayload, size_t cachedOffset)
+void JIT::compileGetDirectOffset(JSObject* base, RegisterID resultTag, RegisterID resultPayload, PropertyOffset cachedOffset)

 {
 {

-    load32(reinterpret_cast<char*>(&base->m_propertyStorage[cachedOffset]) + OBJECT_OFFSETOF(JSValue, u.asBits.payload), resultPayload);
-    load32(reinterpret_cast<char*>(&base->m_propertyStorage[cachedOffset]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag), resultTag);
+    if (isInlineOffset(cachedOffset)) {
+        move(TrustedImmPtr(base->locationForOffset(cachedOffset)), resultTag);
+        load32(Address(resultTag, OBJECT_OFFSETOF(JSValue, u.asBits.payload)), resultPayload);
+        load32(Address(resultTag, OBJECT_OFFSETOF(JSValue, u.asBits.tag)), resultTag);
+        return;
+    }
+    
+    loadPtr(base->butterflyAddress(), resultTag);
+    load32(Address(resultTag, offsetInButterfly(cachedOffset) * sizeof(WriteBarrier<Unknown>) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), resultPayload);
+    load32(Address(resultTag, offsetInButterfly(cachedOffset) * sizeof(WriteBarrier<Unknown>) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), resultTag);

 }
 
 }
 

-void JIT::privateCompilePutByIdTransition(StructureStubInfo* stubInfo, Structure* oldStructure, Structure* newStructure, size_t cachedOffset, StructureChain* chain, ReturnAddressPtr returnAddress, bool direct)
+void JIT::compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, RegisterID offset, FinalObjectMode finalObjectMode)

 {
 {

-    // The code below assumes that regT0 contains the basePayload and regT1 contains the baseTag.  Restore them from the stack.
-#if CPU(MIPS) || CPU(SH4) || CPU(ARM)
-    // For MIPS, we don't add sizeof(void*) to the stack offset.
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
-    // For MIPS, we don't add sizeof(void*) to the stack offset.
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
-#else
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + sizeof(void*) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + sizeof(void*) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
-#endif
-
-    JumpList failureCases;
-    failureCases.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
-    failureCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(oldStructure)));
-    testPrototype(oldStructure->storedPrototype(), failureCases);
+    ASSERT(sizeof(JSValue) == 8);

     
     

-    if (!direct) {
-        // Verify that nothing in the prototype chain has a setter for this property. 
-        for (WriteBarrier<Structure>* it = chain->head(); *it; ++it)
-            testPrototype((*it)->storedPrototype(), failureCases);
-    }
-
-    // Reallocate property storage if needed.
-    Call callTarget;
-    bool willNeedStorageRealloc = oldStructure->propertyStorageCapacity() != newStructure->propertyStorageCapacity();
-    if (willNeedStorageRealloc) {
-        // This trampoline was called to like a JIT stub; before we can can call again we need to
-        // remove the return address from the stack, to prevent the stack from becoming misaligned.
-        preserveReturnAddressAfterCall(regT3);
-        
-        JITStubCall stubCall(this, cti_op_put_by_id_transition_realloc);
-        stubCall.skipArgument(); // base
-        stubCall.skipArgument(); // ident
-        stubCall.skipArgument(); // value
-        stubCall.addArgument(TrustedImm32(oldStructure->propertyStorageCapacity()));
-        stubCall.addArgument(TrustedImm32(newStructure->propertyStorageCapacity()));
-        stubCall.call(regT0);
-        
-        restoreReturnAddressBeforeReturn(regT3);
-
-#if CPU(MIPS) || CPU(SH4) || CPU(ARM)
-        // For MIPS, we don't add sizeof(void*) to the stack offset.
-        load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
-        // For MIPS, we don't add sizeof(void*) to the stack offset.
-        load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
-#else
-        load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + sizeof(void*) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0);
-        load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[0]) + sizeof(void*) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1);
-#endif
+    if (finalObjectMode == MayBeFinal) {
+        Jump isInline = branch32(LessThan, offset, TrustedImm32(firstOutOfLineOffset));
+        loadPtr(Address(base, JSObject::butterflyOffset()), base);
+        neg32(offset);
+        Jump done = jump();
+        isInline.link(this);
+        addPtr(TrustedImmPtr(JSObject::offsetOfInlineStorage() - (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), base);
+        done.link(this);
+    } else {
+        if (!ASSERT_DISABLED) {
+            Jump isOutOfLine = branch32(GreaterThanOrEqual, offset, TrustedImm32(firstOutOfLineOffset));
+            abortWithReason(JITOffsetIsNotOutOfLine);
+            isOutOfLine.link(this);
+        }
+        loadPtr(Address(base, JSObject::butterflyOffset()), base);
+        neg32(offset);

     }
     }

+    load32(BaseIndex(base, offset, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), resultPayload);
+    load32(BaseIndex(base, offset, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), resultTag);
+}

 
 

-    storePtrWithWriteBarrier(TrustedImmPtr(newStructure), regT0, Address(regT0, JSCell::structureOffset()));
-    
-#if CPU(MIPS) || CPU(SH4) || CPU(ARM)
-    // For MIPS, we don't add sizeof(void*) to the stack offset.
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[2]) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT3);
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[2]) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT2);
-#else
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[2]) + sizeof(void*) + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT3);
-    load32(Address(stackPointerRegister, OBJECT_OFFSETOF(JITStackFrame, args[2]) + sizeof(void*) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT2);
-#endif
-
-    // Write the value
-    compilePutDirectOffset(regT0, regT2, regT3, newStructure, cachedOffset);
-
-    ret();
-    
-    ASSERT(!failureCases.empty());
-    failureCases.link(this);
-    restoreArgumentReferenceForTrampoline();
-    Call failureCall = tailRecursiveCall();
-    
-    LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock->executablePool());
+void JIT::emit_op_get_by_pname(Instruction* currentInstruction)
+{
+    int dst = currentInstruction[1].u.operand;
+    int base = currentInstruction[2].u.operand;
+    int property = currentInstruction[3].u.operand;
+    unsigned expected = currentInstruction[4].u.operand;
+    int iter = currentInstruction[5].u.operand;
+    int i = currentInstruction[6].u.operand;

     
     

-    patchBuffer.link(failureCall, FunctionPtr(direct ? cti_op_put_by_id_direct_fail : cti_op_put_by_id_fail));
+    emitLoad2(property, regT1, regT0, base, regT3, regT2);
+    emitJumpSlowCaseIfNotJSCell(property, regT1);
+    addSlowCase(branchPtr(NotEqual, regT0, payloadFor(expected)));
+    // Property registers are now available as the property is known
+    emitJumpSlowCaseIfNotJSCell(base, regT3);
+    emitLoadPayload(iter, regT1);

     
     

-    if (willNeedStorageRealloc) {
-        ASSERT(m_calls.size() == 1);
-        patchBuffer.link(m_calls[0].from, FunctionPtr(cti_op_put_by_id_transition_realloc));
-    }
+    // Test base's structure
+    loadPtr(Address(regT2, JSCell::structureIDOffset()), regT0);
+    addSlowCase(branchPtr(NotEqual, regT0, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure))));
+    load32(addressFor(i), regT3);
+    sub32(TrustedImm32(1), regT3);
+    addSlowCase(branch32(AboveOrEqual, regT3, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_numCacheableSlots))));
+    Jump inlineProperty = branch32(Below, regT3, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructureInlineCapacity)));
+    add32(TrustedImm32(firstOutOfLineOffset), regT3);
+    sub32(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructureInlineCapacity)), regT3);
+    inlineProperty.link(this);
+    compileGetDirectOffset(regT2, regT1, regT0, regT3);    

     
     

-    CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
-    stubInfo->stubRoutine = entryLabel;
-    RepatchBuffer repatchBuffer(m_codeBlock);
-    repatchBuffer.relinkCallerToTrampoline(returnAddress, entryLabel);
+    emitStore(dst, regT1, regT0);

 }
 
 }
 

-void JIT::patchGetByIdSelf(CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, size_t cachedOffset, ReturnAddressPtr returnAddress)
+void JIT::emitSlow_op_get_by_pname(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)

 {
 {

-    RepatchBuffer repatchBuffer(codeBlock);
+    int dst = currentInstruction[1].u.operand;
+    int base = currentInstruction[2].u.operand;
+    int property = currentInstruction[3].u.operand;

     
     

-    // We don't want to patch more than once - in future go to cti_op_get_by_id_generic.
-    // Should probably go to JITStubs::cti_op_get_by_id_fail, but that doesn't do anything interesting right now.
-    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_self_fail));
+    linkSlowCaseIfNotJSCell(iter, property);
+    linkSlowCase(iter);
+    linkSlowCaseIfNotJSCell(iter, base);
+    linkSlowCase(iter);
+    linkSlowCase(iter);

     
     

-    int offset = sizeof(JSValue) * cachedOffset;
-
-    // Patch the offset into the propoerty map to load from, then patch the Structure to look for.
-    repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabelPtrAtOffset(patchOffsetGetByIdStructure), structure);
-    repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabelCompactAtOffset(patchOffsetGetByIdPropertyMapOffset1), offset + OBJECT_OFFSETOF(JSValue, u.asBits.payload)); // payload
-    repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabelCompactAtOffset(patchOffsetGetByIdPropertyMapOffset2), offset + OBJECT_OFFSETOF(JSValue, u.asBits.tag)); // tag
+    emitLoad(base, regT1, regT0);
+    emitLoad(property, regT3, regT2);
+    callOperation(operationGetByValGeneric, dst, regT1, regT0, regT3, regT2);

 }
 
 }
 

-void JIT::patchPutByIdReplace(CodeBlock* codeBlock, StructureStubInfo* stubInfo, Structure* structure, size_t cachedOffset, ReturnAddressPtr returnAddress, bool direct)
+void JIT::emitVarInjectionCheck(bool needsVarInjectionChecks)

 {
 {

-    RepatchBuffer repatchBuffer(codeBlock);
-    
-    // We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
-    // Should probably go to cti_op_put_by_id_fail, but that doesn't do anything interesting right now.
-    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(direct ? cti_op_put_by_id_direct_generic : cti_op_put_by_id_generic));
-    
-    int offset = sizeof(JSValue) * cachedOffset;
-
-    // Patch the offset into the propoerty map to load from, then patch the Structure to look for.
-    repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabelPtrAtOffset(patchOffsetPutByIdStructure), structure);
-    repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabel32AtOffset(patchOffsetPutByIdPropertyMapOffset1), offset + OBJECT_OFFSETOF(JSValue, u.asBits.payload)); // payload
-    repatchBuffer.repatch(stubInfo->hotPathBegin.dataLabel32AtOffset(patchOffsetPutByIdPropertyMapOffset2), offset + OBJECT_OFFSETOF(JSValue, u.asBits.tag)); // tag
+    if (!needsVarInjectionChecks)
+        return;
+    addSlowCase(branch8(Equal, AbsoluteAddress(m_codeBlock->globalObject()->varInjectionWatchpoint()->addressOfState()), TrustedImm32(IsInvalidated)));

 }
 
 }
 

-void JIT::privateCompilePatchGetArrayLength(ReturnAddressPtr returnAddress)
+void JIT::emitResolveClosure(int dst, bool needsVarInjectionChecks, unsigned depth)

 {
 {

-    StructureStubInfo* stubInfo = &m_codeBlock->getStubInfo(returnAddress);
-    
-    // regT0 holds a JSCell*
-    
-    // Check for array
-    Jump failureCases1 = branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsArrayVPtr));
-    
-    // Checks out okay! - get the length from the storage
-    loadPtr(Address(regT0, JSArray::storageOffset()), regT2);
-    load32(Address(regT2, OBJECT_OFFSETOF(ArrayStorage, m_length)), regT2);
-    
-    Jump failureCases2 = branch32(Above, regT2, TrustedImm32(INT_MAX));
-    move(regT2, regT0);
-    move(TrustedImm32(JSValue::Int32Tag), regT1);
-    Jump success = jump();
-    
-    LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock->executablePool());
-    
-    // Use the patch information to link the failure cases back to the original slow case routine.
-    CodeLocationLabel slowCaseBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
-    patchBuffer.link(failureCases1, slowCaseBegin);
-    patchBuffer.link(failureCases2, slowCaseBegin);
-    
-    // On success return back to the hot patch code, at a point it will perform the store to dest for us.
-    patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
-    
-    // Track the stub we have created so that it will be deleted later.
-    CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
-    stubInfo->stubRoutine = entryLabel;
-    
-    // Finally patch the jump to slow case back in the hot path to jump here instead.
-    CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
-    RepatchBuffer repatchBuffer(m_codeBlock);
-    repatchBuffer.relink(jumpLocation, entryLabel);
-    
-    // We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
-    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_array_fail));
+    emitVarInjectionCheck(needsVarInjectionChecks);
+    move(TrustedImm32(JSValue::CellTag), regT1);
+    emitLoadPayload(JSStack::ScopeChain, regT0);
+    if (m_codeBlock->needsActivation()) {
+        emitLoadPayload(m_codeBlock->activationRegister().offset(), regT2);
+        Jump noActivation = branchTestPtr(Zero, regT2);
+        loadPtr(Address(regT2, JSScope::offsetOfNext()), regT0);
+        noActivation.link(this);
+    }
+    for (unsigned i = 0; i < depth; ++i)
+        loadPtr(Address(regT0, JSScope::offsetOfNext()), regT0);
+    emitStore(dst, regT1, regT0);

 }
 
 }
 

-void JIT::privateCompileGetByIdProto(StructureStubInfo* stubInfo, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame)
+void JIT::emit_op_resolve_scope(Instruction* currentInstruction)

 {
 {

-    // regT0 holds a JSCell*
-    
-    // The prototype object definitely exists (if this stub exists the CodeBlock is referencing a Structure that is
-    // referencing the prototype object - let's speculatively load it's table nice and early!)
-    JSObject* protoObject = asObject(structure->prototypeForLookup(callFrame));
-    
-    Jump failureCases1 = checkStructure(regT0, structure);
-    
-    // Check the prototype object's Structure had not changed.
-    move(TrustedImmPtr(protoObject), regT3);
-    Jump failureCases2 = branchPtr(NotEqual, Address(regT3, JSCell::structureOffset()), TrustedImmPtr(prototypeStructure));
-
-    bool needsStubLink = false;
-    // Checks out okay!
-    if (slot.cachedPropertyType() == PropertySlot::Getter) {
-        needsStubLink = true;
-        compileGetDirectOffset(protoObject, regT2, regT1, cachedOffset);
-        JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
-        stubCall.addArgument(regT1);
-        stubCall.addArgument(regT0);
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else if (slot.cachedPropertyType() == PropertySlot::Custom) {
-        needsStubLink = true;
-        JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
-        stubCall.addArgument(TrustedImmPtr(protoObject));
-        stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
-        stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else
-        compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
-    
-    Jump success = jump();
-    
-    LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock->executablePool());
-    
-    // Use the patch information to link the failure cases back to the original slow case routine.
-    CodeLocationLabel slowCaseBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
-    patchBuffer.link(failureCases1, slowCaseBegin);
-    patchBuffer.link(failureCases2, slowCaseBegin);
-    
-    // On success return back to the hot patch code, at a point it will perform the store to dest for us.
-    patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
-
-    if (needsStubLink) {
-        for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
-            if (iter->to)
-                patchBuffer.link(iter->from, FunctionPtr(iter->to));
-        }
+    int dst = currentInstruction[1].u.operand;
+    ResolveType resolveType = static_cast<ResolveType>(currentInstruction[3].u.operand);
+    unsigned depth = currentInstruction[4].u.operand;
+
+    switch (resolveType) {
+    case GlobalProperty:
+    case GlobalVar:
+    case GlobalPropertyWithVarInjectionChecks:
+    case GlobalVarWithVarInjectionChecks:
+        emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
+        move(TrustedImm32(JSValue::CellTag), regT1);
+        move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
+        emitStore(dst, regT1, regT0);
+        break;
+    case ClosureVar:
+    case ClosureVarWithVarInjectionChecks:
+        emitResolveClosure(dst, needsVarInjectionChecks(resolveType), depth);
+        break;
+    case Dynamic:
+        addSlowCase(jump());
+        break;

     }
     }

+}

 
 

-    // Track the stub we have created so that it will be deleted later.
-    CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
-    stubInfo->stubRoutine = entryLabel;
-    
-    // Finally patch the jump to slow case back in the hot path to jump here instead.
-    CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
-    RepatchBuffer repatchBuffer(m_codeBlock);
-    repatchBuffer.relink(jumpLocation, entryLabel);
-    
-    // We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
-    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_proto_list));
+void JIT::emitSlow_op_resolve_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    int dst = currentInstruction[1].u.operand;
+    ResolveType resolveType = static_cast<ResolveType>(currentInstruction[3].u.operand);
+
+    if (resolveType == GlobalProperty || resolveType == GlobalVar || resolveType == ClosureVar)
+        return;
+
+    linkSlowCase(iter);
+    int32_t indentifierIndex = currentInstruction[2].u.operand;
+    callOperation(operationResolveScope, dst, indentifierIndex);

 }
 
 }
 

+void JIT::emitLoadWithStructureCheck(int scope, Structure** structureSlot)
+{
+    emitLoad(scope, regT1, regT0);
+    loadPtr(structureSlot, regT2);
+    addSlowCase(branchPtr(NotEqual, Address(regT0, JSCell::structureIDOffset()), regT2));
+}

 
 

-void JIT::privateCompileGetByIdSelfList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* polymorphicStructures, int currentIndex, Structure* structure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset)
+void JIT::emitGetGlobalProperty(uintptr_t* operandSlot)

 {
 {

-    // regT0 holds a JSCell*
-    Jump failureCase = checkStructure(regT0, structure);
-    bool needsStubLink = false;
-    if (slot.cachedPropertyType() == PropertySlot::Getter) {
-        needsStubLink = true;
-        compileGetDirectOffset(regT0, regT2, regT1, structure, cachedOffset);
-        JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
-        stubCall.addArgument(regT1);
-        stubCall.addArgument(regT0);
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else if (slot.cachedPropertyType() == PropertySlot::Custom) {
-        needsStubLink = true;
-        JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
-        stubCall.addArgument(regT0);
-        stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
-        stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else
-        compileGetDirectOffset(regT0, regT1, regT0, structure, cachedOffset);
-
-    Jump success = jump();
-    
-    LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock->executablePool());
-    if (needsStubLink) {
-        for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
-            if (iter->to)
-                patchBuffer.link(iter->from, FunctionPtr(iter->to));
-        }
-    }    
-    // Use the patch information to link the failure cases back to the original slow case routine.
-    CodeLocationLabel lastProtoBegin = polymorphicStructures->list[currentIndex - 1].stubRoutine;
-    if (!lastProtoBegin)
-        lastProtoBegin = stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall);
-    
-    patchBuffer.link(failureCase, lastProtoBegin);
-    
-    // On success return back to the hot patch code, at a point it will perform the store to dest for us.
-    patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
+    move(regT0, regT2);
+    load32(operandSlot, regT3);
+    compileGetDirectOffset(regT2, regT1, regT0, regT3, KnownNotFinal);
+}

 
 

-    CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
+void JIT::emitGetGlobalVar(uintptr_t operand)
+{
+    load32(reinterpret_cast<char*>(operand) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag), regT1);
+    load32(reinterpret_cast<char*>(operand) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload), regT0);
+}

 
 

-    polymorphicStructures->list[currentIndex].set(*m_globalData, m_codeBlock->ownerExecutable(), entryLabel, structure);
-    
-    // Finally patch the jump to slow case back in the hot path to jump here instead.
-    CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
-    RepatchBuffer repatchBuffer(m_codeBlock);
-    repatchBuffer.relink(jumpLocation, entryLabel);
+void JIT::emitGetClosureVar(int scope, uintptr_t operand)
+{
+    emitLoad(scope, regT1, regT0);
+    loadPtr(Address(regT0, JSVariableObject::offsetOfRegisters()), regT0);
+    load32(Address(regT0, operand * sizeof(Register) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)), regT1);
+    load32(Address(regT0, operand * sizeof(Register) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)), regT0);

 }
 
 }
 

-void JIT::privateCompileGetByIdProtoList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructures, int currentIndex, Structure* structure, Structure* prototypeStructure, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, CallFrame* callFrame)
+void JIT::emit_op_get_from_scope(Instruction* currentInstruction)

 {
 {

-    // regT0 holds a JSCell*
-    
-    // The prototype object definitely exists (if this stub exists the CodeBlock is referencing a Structure that is
-    // referencing the prototype object - let's speculatively load it's table nice and early!)
-    JSObject* protoObject = asObject(structure->prototypeForLookup(callFrame));
-    
-    // Check eax is an object of the right Structure.
-    Jump failureCases1 = checkStructure(regT0, structure);
-    
-    // Check the prototype object's Structure had not changed.
-    move(TrustedImmPtr(protoObject), regT3);
-    Jump failureCases2 = branchPtr(NotEqual, Address(regT3, JSCell::structureOffset()), TrustedImmPtr(prototypeStructure));
-    
-    bool needsStubLink = false;
-    if (slot.cachedPropertyType() == PropertySlot::Getter) {
-        needsStubLink = true;
-        compileGetDirectOffset(protoObject, regT2, regT1, cachedOffset);
-        JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
-        stubCall.addArgument(regT1);
-        stubCall.addArgument(regT0);
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else if (slot.cachedPropertyType() == PropertySlot::Custom) {
-        needsStubLink = true;
-        JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
-        stubCall.addArgument(TrustedImmPtr(protoObject));
-        stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
-        stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else
-        compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
-    
-    Jump success = jump();
-    
-    LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock->executablePool());
-    if (needsStubLink) {
-        for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
-            if (iter->to)
-                patchBuffer.link(iter->from, FunctionPtr(iter->to));
-        }
+    int dst = currentInstruction[1].u.operand;
+    int scope = currentInstruction[2].u.operand;
+    ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
+    Structure** structureSlot = currentInstruction[5].u.structure.slot();
+    uintptr_t* operandSlot = reinterpret_cast<uintptr_t*>(&currentInstruction[6].u.pointer);
+
+    switch (resolveType) {
+    case GlobalProperty:
+    case GlobalPropertyWithVarInjectionChecks:
+        emitLoadWithStructureCheck(scope, structureSlot); // Structure check covers var injection.
+        emitGetGlobalProperty(operandSlot);
+        break;
+    case GlobalVar:
+    case GlobalVarWithVarInjectionChecks:
+        emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
+        emitGetGlobalVar(*operandSlot);
+        break;
+    case ClosureVar:
+    case ClosureVarWithVarInjectionChecks:
+        emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
+        emitGetClosureVar(scope, *operandSlot);
+        break;
+    case Dynamic:
+        addSlowCase(jump());
+        break;

     }
     }

-    // Use the patch information to link the failure cases back to the original slow case routine.
-    CodeLocationLabel lastProtoBegin = prototypeStructures->list[currentIndex - 1].stubRoutine;
-    patchBuffer.link(failureCases1, lastProtoBegin);
-    patchBuffer.link(failureCases2, lastProtoBegin);
-    
-    // On success return back to the hot patch code, at a point it will perform the store to dest for us.
-    patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
-    
-    CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
+    emitValueProfilingSite();
+    emitStore(dst, regT1, regT0);
+}

 
 

-    prototypeStructures->list[currentIndex].set(callFrame->globalData(), m_codeBlock->ownerExecutable(), entryLabel, structure, prototypeStructure);
-    
-    // Finally patch the jump to slow case back in the hot path to jump here instead.
-    CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
-    RepatchBuffer repatchBuffer(m_codeBlock);
-    repatchBuffer.relink(jumpLocation, entryLabel);
+void JIT::emitSlow_op_get_from_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    int dst = currentInstruction[1].u.operand;
+    ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
+
+    if (resolveType == GlobalVar || resolveType == ClosureVar)
+        return;
+
+    linkSlowCase(iter);
+    callOperation(WithProfile, operationGetFromScope, dst, currentInstruction);

 }
 
 }
 

-void JIT::privateCompileGetByIdChainList(StructureStubInfo* stubInfo, PolymorphicAccessStructureList* prototypeStructures, int currentIndex, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, CallFrame* callFrame)
+void JIT::emitPutGlobalProperty(uintptr_t* operandSlot, int value)

 {
 {

-    // regT0 holds a JSCell*
-    ASSERT(count);
-    
-    JumpList bucketsOfFail;
-    
-    // Check eax is an object of the right Structure.
-    bucketsOfFail.append(checkStructure(regT0, structure));
-    
-    Structure* currStructure = structure;
-    WriteBarrier<Structure>* it = chain->head();
-    JSObject* protoObject = 0;
-    for (unsigned i = 0; i < count; ++i, ++it) {
-        protoObject = asObject(currStructure->prototypeForLookup(callFrame));
-        currStructure = it->get();
-        testPrototype(protoObject, bucketsOfFail);
-    }
-    ASSERT(protoObject);
-    
-    bool needsStubLink = false;
-    if (slot.cachedPropertyType() == PropertySlot::Getter) {
-        needsStubLink = true;
-        compileGetDirectOffset(protoObject, regT2, regT1, cachedOffset);
-        JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
-        stubCall.addArgument(regT1);
-        stubCall.addArgument(regT0);
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else if (slot.cachedPropertyType() == PropertySlot::Custom) {
-        needsStubLink = true;
-        JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
-        stubCall.addArgument(TrustedImmPtr(protoObject));
-        stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
-        stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else
-        compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
-
-    Jump success = jump();
-    
-    LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock->executablePool());
-    if (needsStubLink) {
-        for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
-            if (iter->to)
-                patchBuffer.link(iter->from, FunctionPtr(iter->to));
-        }
-    }
-    // Use the patch information to link the failure cases back to the original slow case routine.
-    CodeLocationLabel lastProtoBegin = prototypeStructures->list[currentIndex - 1].stubRoutine;
-    
-    patchBuffer.link(bucketsOfFail, lastProtoBegin);
-    
-    // On success return back to the hot patch code, at a point it will perform the store to dest for us.
-    patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
-    
-    CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
+    emitLoad(value, regT3, regT2);

     
     

-    // Track the stub we have created so that it will be deleted later.
-    prototypeStructures->list[currentIndex].set(callFrame->globalData(), m_codeBlock->ownerExecutable(), entryLabel, structure, chain);
-    
-    // Finally patch the jump to slow case back in the hot path to jump here instead.
-    CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
-    RepatchBuffer repatchBuffer(m_codeBlock);
-    repatchBuffer.relink(jumpLocation, entryLabel);
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT0);
+    loadPtr(operandSlot, regT1);
+    negPtr(regT1);
+    store32(regT3, BaseIndex(regT0, regT1, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
+    store32(regT2, BaseIndex(regT0, regT1, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));

 }
 
 }
 

-void JIT::privateCompileGetByIdChain(StructureStubInfo* stubInfo, Structure* structure, StructureChain* chain, size_t count, const Identifier& ident, const PropertySlot& slot, size_t cachedOffset, ReturnAddressPtr returnAddress, CallFrame* callFrame)
+void JIT::emitNotifyWrite(RegisterID tag, RegisterID payload, RegisterID scratch, VariableWatchpointSet* set)

 {
 {

-    // regT0 holds a JSCell*
-    ASSERT(count);
-    
-    JumpList bucketsOfFail;
-    
-    // Check eax is an object of the right Structure.
-    bucketsOfFail.append(checkStructure(regT0, structure));
-    
-    Structure* currStructure = structure;
-    WriteBarrier<Structure>* it = chain->head();
-    JSObject* protoObject = 0;
-    for (unsigned i = 0; i < count; ++i, ++it) {
-        protoObject = asObject(currStructure->prototypeForLookup(callFrame));
-        currStructure = it->get();
-        testPrototype(protoObject, bucketsOfFail);
-    }
-    ASSERT(protoObject);
-    
-    bool needsStubLink = false;
-    if (slot.cachedPropertyType() == PropertySlot::Getter) {
-        needsStubLink = true;
-        compileGetDirectOffset(protoObject, regT2, regT1, cachedOffset);
-        JITStubCall stubCall(this, cti_op_get_by_id_getter_stub);
-        stubCall.addArgument(regT1);
-        stubCall.addArgument(regT0);
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else if (slot.cachedPropertyType() == PropertySlot::Custom) {
-        needsStubLink = true;
-        JITStubCall stubCall(this, cti_op_get_by_id_custom_stub);
-        stubCall.addArgument(TrustedImmPtr(protoObject));
-        stubCall.addArgument(TrustedImmPtr(FunctionPtr(slot.customGetter()).executableAddress()));
-        stubCall.addArgument(TrustedImmPtr(const_cast<Identifier*>(&ident)));
-        stubCall.addArgument(TrustedImmPtr(stubInfo->callReturnLocation.executableAddress()));
-        stubCall.call();
-    } else
-        compileGetDirectOffset(protoObject, regT1, regT0, cachedOffset);
-    Jump success = jump();
-    
-    LinkBuffer patchBuffer(*m_globalData, this, m_codeBlock->executablePool());
-    if (needsStubLink) {
-        for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
-            if (iter->to)
-                patchBuffer.link(iter->from, FunctionPtr(iter->to));
-        }
-    }
-    // Use the patch information to link the failure cases back to the original slow case routine.
-    patchBuffer.link(bucketsOfFail, stubInfo->callReturnLocation.labelAtOffset(-patchOffsetGetByIdSlowCaseCall));
-    
-    // On success return back to the hot patch code, at a point it will perform the store to dest for us.
-    patchBuffer.link(success, stubInfo->hotPathBegin.labelAtOffset(patchOffsetGetByIdPutResult));
+    if (!set || set->state() == IsInvalidated)
+        return;

     
     

-    // Track the stub we have created so that it will be deleted later.
-    CodeLocationLabel entryLabel = patchBuffer.finalizeCodeAddendum();
-    stubInfo->stubRoutine = entryLabel;
-    
-    // Finally patch the jump to slow case back in the hot path to jump here instead.
-    CodeLocationJump jumpLocation = stubInfo->hotPathBegin.jumpAtOffset(patchOffsetGetByIdBranchToSlowCase);
-    RepatchBuffer repatchBuffer(m_codeBlock);
-    repatchBuffer.relink(jumpLocation, entryLabel);
-    
-    // We don't want to patch more than once - in future go to cti_op_put_by_id_generic.
-    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(cti_op_get_by_id_proto_list));
+    load8(set->addressOfState(), scratch);
+    Jump isDone = branch32(Equal, scratch, TrustedImm32(IsInvalidated));
+
+    JumpList notifySlow = branch32(
+        NotEqual, AbsoluteAddress(set->addressOfInferredValue()->payloadPointer()), payload);
+    notifySlow.append(branch32(
+        NotEqual, AbsoluteAddress(set->addressOfInferredValue()->tagPointer()), tag));
+    addSlowCase(notifySlow);
+
+    isDone.link(this);

 }
 
 }
 

-/* ------------------------------ END: !ENABLE / ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS) ------------------------------ */
+void JIT::emitPutGlobalVar(uintptr_t operand, int value, VariableWatchpointSet* set)
+{
+    emitLoad(value, regT1, regT0);
+    emitNotifyWrite(regT1, regT0, regT2, set);
+    store32(regT1, reinterpret_cast<char*>(operand) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
+    store32(regT0, reinterpret_cast<char*>(operand) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
+}

 
 

-#endif // !ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
+void JIT::emitPutClosureVar(int scope, uintptr_t operand, int value)
+{
+    emitLoad(value, regT3, regT2);
+    emitLoad(scope, regT1, regT0);
+    loadPtr(Address(regT0, JSVariableObject::offsetOfRegisters()), regT0);
+    store32(regT3, Address(regT0, operand * sizeof(Register) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
+    store32(regT2, Address(regT0, operand * sizeof(Register) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
+}

 
 

-void JIT::compileGetDirectOffset(RegisterID base, RegisterID resultTag, RegisterID resultPayload, RegisterID offset)
+void JIT::emit_op_put_to_scope(Instruction* currentInstruction)

 {
 {

-    ASSERT(sizeof(JSValue) == 8);
-    
-    loadPtr(Address(base, OBJECT_OFFSETOF(JSObject, m_propertyStorage)), base);
-    loadPtr(BaseIndex(base, offset, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload)), resultPayload);
-    loadPtr(BaseIndex(base, offset, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag)), resultTag);
+    int scope = currentInstruction[1].u.operand;
+    int value = currentInstruction[3].u.operand;
+    ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
+    Structure** structureSlot = currentInstruction[5].u.structure.slot();
+    uintptr_t* operandSlot = reinterpret_cast<uintptr_t*>(&currentInstruction[6].u.pointer);
+
+    switch (resolveType) {
+    case GlobalProperty:
+    case GlobalPropertyWithVarInjectionChecks:
+        emitWriteBarrier(m_codeBlock->globalObject(), value, ShouldFilterValue);
+        emitLoadWithStructureCheck(scope, structureSlot); // Structure check covers var injection.
+        emitPutGlobalProperty(operandSlot, value);
+        break;
+    case GlobalVar:
+    case GlobalVarWithVarInjectionChecks:
+        emitWriteBarrier(m_codeBlock->globalObject(), value, ShouldFilterValue);
+        emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
+        emitPutGlobalVar(*operandSlot, value, currentInstruction[5].u.watchpointSet);
+        break;
+    case ClosureVar:
+    case ClosureVarWithVarInjectionChecks:
+        emitWriteBarrier(scope, value, ShouldFilterValue);
+        emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
+        emitPutClosureVar(scope, *operandSlot, value);
+        break;
+    case Dynamic:
+        addSlowCase(jump());
+        break;
+    }

 }
 
 }
 

-void JIT::emit_op_get_by_pname(Instruction* currentInstruction)
+void JIT::emitSlow_op_put_to_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)

 {
 {

-    unsigned dst = currentInstruction[1].u.operand;
-    unsigned base = currentInstruction[2].u.operand;
-    unsigned property = currentInstruction[3].u.operand;
-    unsigned expected = currentInstruction[4].u.operand;
-    unsigned iter = currentInstruction[5].u.operand;
-    unsigned i = currentInstruction[6].u.operand;
-    
-    emitLoad2(property, regT1, regT0, base, regT3, regT2);
-    emitJumpSlowCaseIfNotJSCell(property, regT1);
-    addSlowCase(branchPtr(NotEqual, regT0, payloadFor(expected)));
-    // Property registers are now available as the property is known
-    emitJumpSlowCaseIfNotJSCell(base, regT3);
-    emitLoadPayload(iter, regT1);
-    
-    // Test base's structure
-    loadPtr(Address(regT2, JSCell::structureOffset()), regT0);
-    addSlowCase(branchPtr(NotEqual, regT0, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure))));
-    load32(addressFor(i), regT3);
-    sub32(TrustedImm32(1), regT3);
-    addSlowCase(branch32(AboveOrEqual, regT3, Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_numCacheableSlots))));
-    compileGetDirectOffset(regT2, regT1, regT0, regT3);    
-    
-    emitStore(dst, regT1, regT0);
-    map(m_bytecodeOffset + OPCODE_LENGTH(op_get_by_pname), dst, regT1, regT0);
+    ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
+    unsigned linkCount = 0;
+    if (resolveType != GlobalVar && resolveType != ClosureVar)
+        linkCount++;
+    if ((resolveType == GlobalVar || resolveType == GlobalVarWithVarInjectionChecks)
+        && currentInstruction[5].u.watchpointSet->state() != IsInvalidated)
+        linkCount += 2;
+    if (!linkCount)
+        return;
+    while (linkCount--)
+        linkSlowCase(iter);
+    callOperation(operationPutToScope, currentInstruction);

 }
 
 }
 

-void JIT::emitSlow_op_get_by_pname(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+void JIT::emit_op_init_global_const(Instruction* currentInstruction)

 {
 {

-    unsigned dst = currentInstruction[1].u.operand;
-    unsigned base = currentInstruction[2].u.operand;
-    unsigned property = currentInstruction[3].u.operand;
-    
-    linkSlowCaseIfNotJSCell(iter, property);
-    linkSlowCase(iter);
-    linkSlowCaseIfNotJSCell(iter, base);
-    linkSlowCase(iter);
-    linkSlowCase(iter);
+    WriteBarrier<Unknown>* registerPointer = currentInstruction[1].u.registerPointer;
+    int value = currentInstruction[2].u.operand;
+
+    JSGlobalObject* globalObject = m_codeBlock->globalObject();
+
+    emitWriteBarrier(globalObject, value, ShouldFilterValue);
+
+    emitLoad(value, regT1, regT0);

     
     

-    JITStubCall stubCall(this, cti_op_get_by_val);
-    stubCall.addArgument(base);
-    stubCall.addArgument(property);
-    stubCall.call(dst);
+    store32(regT1, registerPointer->tagPointer());
+    store32(regT0, registerPointer->payloadPointer());

 }
 
 } // namespace JSC
 }
 
 } // namespace JSC