webkitgtk-2.10.2webkitgtk-2.10.2

1 files changed, 1483 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/jit/JITPropertyAccess.cpp b/Source/JavaScriptCore/jit/JITPropertyAccess.cpp
new file mode 100644
index 000000000..172e013d5
--- /dev/null
+++ b/Source/JavaScriptCore/jit/JITPropertyAccess.cpp
@@ -0,0 +1,1483 @@
+/*
+ * Copyright (C) 2008, 2009, 2014, 2015 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+
+#if ENABLE(JIT)
+#include "JIT.h"
+
+#include "CodeBlock.h"
+#include "DirectArguments.h"
+#include "GCAwareJITStubRoutine.h"
+#include "GetterSetter.h"
+#include "Interpreter.h"
+#include "JITInlines.h"
+#include "JSArray.h"
+#include "JSEnvironmentRecord.h"
+#include "JSFunction.h"
+#include "LinkBuffer.h"
+#include "RepatchBuffer.h"
+#include "ResultType.h"
+#include "SamplingTool.h"
+#include "ScopedArguments.h"
+#include "ScopedArgumentsTable.h"
+#include <wtf/StringPrintStream.h>
+
+
+namespace JSC {
+#if USE(JSVALUE64)
+
+JIT::CodeRef JIT::stringGetByValStubGenerator(VM* vm)
+{
+    JSInterfaceJIT jit(vm);
+    JumpList failures;
+    failures.append(JSC::branchStructure(jit,
+        NotEqual, 
+        Address(regT0, JSCell::structureIDOffset()), 
+        vm->stringStructure.get()));
+
+    // Load string length to regT2, and start the process of loading the data pointer into regT0
+    jit.load32(Address(regT0, ThunkHelpers::jsStringLengthOffset()), regT2);
+    jit.loadPtr(Address(regT0, ThunkHelpers::jsStringValueOffset()), 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, regT1, regT2));
+    
+    // Load the character
+    JumpList is16Bit;
+    JumpList cont8Bit;
+    // Load the string flags
+    jit.loadPtr(Address(regT0, StringImpl::flagsOffset()), regT2);
+    jit.loadPtr(Address(regT0, StringImpl::dataOffset()), regT0);
+    is16Bit.append(jit.branchTest32(Zero, regT2, TrustedImm32(StringImpl::flagIs8Bit())));
+    jit.load8(BaseIndex(regT0, regT1, TimesOne, 0), regT0);
+    cont8Bit.append(jit.jump());
+    is16Bit.link(&jit);
+    jit.load16(BaseIndex(regT0, regT1, TimesTwo, 0), regT0);
+    cont8Bit.link(&jit);
+
+    failures.append(jit.branch32(AboveOrEqual, regT0, TrustedImm32(0x100)));
+    jit.move(TrustedImmPtr(vm->smallStrings.singleCharacterStrings()), regT1);
+    jit.loadPtr(BaseIndex(regT1, regT0, ScalePtr, 0), regT0);
+    jit.ret();
+    
+    failures.link(&jit);
+    jit.move(TrustedImm32(0), regT0);
+    jit.ret();
+    
+    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)
+{
+    int dst = currentInstruction[1].u.operand;
+    int base = currentInstruction[2].u.operand;
+    int property = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    ByValInfo* byValInfo = m_codeBlock->addByValInfo();
+
+    emitGetVirtualRegisters(base, regT0, property, regT1);
+
+    emitJumpSlowCaseIfNotJSCell(regT0, base);
+
+    PatchableJump notIndex = emitPatchableJumpIfNotImmediateInteger(regT1);
+    addSlowCase(notIndex);
+
+    // This is technically incorrect - we're zero-extending an int32.  On the hot path this doesn't matter.
+    // We check the value as if it was a uint32 against the m_vectorLength - which will always fail if
+    // number was signed since m_vectorLength is always less than intmax (since the total allocation
+    // size is always less than 4Gb).  As such zero extending will have been correct (and extending the value
+    // to 64-bits is necessary since it's used in the address calculation).  We zero extend rather than sign
+    // extending since it makes it easier to re-tag the value in the slow case.
+    zeroExtend32ToPtr(regT1, regT1);
+
+    emitArrayProfilingSiteWithCell(regT0, regT2, profile);
+    and32(TrustedImm32(IndexingShapeMask), regT2);
+
+    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();
+        break;
+    }
+    
+    addSlowCase(badType);
+    addSlowCase(slowCases);
+    
+    Label done = label();
+    
+    if (!ASSERT_DISABLED) {
+        Jump resultOK = branchTest64(NonZero, regT0);
+        abortWithReason(JITGetByValResultIsNotEmpty);
+        resultOK.link(this);
+    }
+
+    emitValueProfilingSite();
+    emitPutVirtualRegister(dst);
+
+    Label nextHotPath = label();
+
+    m_byValCompilationInfo.append(ByValCompilationInfo(byValInfo, m_bytecodeOffset, notIndex, badType, mode, profile, done, nextHotPath));
+}
+
+JIT::JumpList JIT::emitDoubleLoad(Instruction*, PatchableJump& badType)
+{
+    JumpList slowCases;
+    
+    badType = patchableBranch32(NotEqual, regT2, TrustedImm32(DoubleShape));
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
+    slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength())));
+    loadDouble(BaseIndex(regT2, regT1, TimesEight), fpRegT0);
+    slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitContiguousLoad(Instruction*, PatchableJump& badType, IndexingType expectedShape)
+{
+    JumpList slowCases;
+    
+    badType = patchableBranch32(NotEqual, regT2, TrustedImm32(expectedShape));
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
+    slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength())));
+    load64(BaseIndex(regT2, regT1, TimesEight), regT0);
+    slowCases.append(branchTest64(Zero, regT0));
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitArrayStorageLoad(Instruction*, PatchableJump& badType)
+{
+    JumpList slowCases;
+
+    add32(TrustedImm32(-ArrayStorageShape), regT2, regT3);
+    badType = patchableBranch32(Above, regT3, TrustedImm32(SlowPutArrayStorageShape - ArrayStorageShape));
+
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
+    slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, ArrayStorage::vectorLengthOffset())));
+
+    load64(BaseIndex(regT2, regT1, TimesEight, ArrayStorage::vectorOffset()), regT0);
+    slowCases.append(branchTest64(Zero, regT0));
+    
+    return slowCases;
+}
+
+JITGetByIdGenerator JIT::emitGetByValWithCachedId(Instruction* currentInstruction, const Identifier& propertyName, Jump& fastDoneCase, Jump& slowDoneCase, JumpList& slowCases)
+{
+    // base: regT0
+    // property: regT1
+    // scratch: regT3
+
+    int dst = currentInstruction[1].u.operand;
+
+    slowCases.append(emitJumpIfNotJSCell(regT1));
+    if (propertyName.isSymbol()) {
+        slowCases.append(branchStructure(NotEqual, Address(regT1, JSCell::structureIDOffset()), m_vm->symbolStructure.get()));
+        loadPtr(Address(regT1, Symbol::offsetOfPrivateName()), regT3);
+    } else {
+        slowCases.append(branchStructure(NotEqual, Address(regT1, JSCell::structureIDOffset()), m_vm->stringStructure.get()));
+        loadPtr(Address(regT1, JSString::offsetOfValue()), regT3);
+    }
+    slowCases.append(branchPtr(NotEqual, regT3, TrustedImmPtr(propertyName.impl())));
+
+    JITGetByIdGenerator gen(
+        m_codeBlock, CodeOrigin(m_bytecodeOffset), RegisterSet::specialRegisters(),
+        JSValueRegs(regT0), JSValueRegs(regT0), DontSpill);
+    gen.generateFastPath(*this);
+
+    fastDoneCase = jump();
+
+    Label coldPathBegin = label();
+    gen.slowPathJump().link(this);
+
+    Call call = callOperation(WithProfile, operationGetByIdOptimize, dst, gen.stubInfo(), regT0, propertyName.impl());
+    gen.reportSlowPathCall(coldPathBegin, call);
+    slowDoneCase = jump();
+
+    return gen;
+}
+
+void JIT::emitSlow_op_get_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    int dst = currentInstruction[1].u.operand;
+    int base = currentInstruction[2].u.operand;
+    int property = currentInstruction[3].u.operand;
+    ByValInfo* byValInfo = m_byValCompilationInfo[m_byValInstructionIndex].byValInfo;
+    
+    linkSlowCaseIfNotJSCell(iter, base); // base cell check
+    linkSlowCase(iter); // property int32 check
+    Jump nonCell = jump();
+    linkSlowCase(iter); // base array check
+    Jump notString = branchStructure(NotEqual, 
+        Address(regT0, JSCell::structureIDOffset()), 
+        m_vm->stringStructure.get());
+    emitNakedCall(CodeLocationLabel(m_vm->getCTIStub(stringGetByValStubGenerator).code()));
+    Jump failed = branchTest64(Zero, regT0);
+    emitPutVirtualRegister(dst, regT0);
+    emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_get_by_val));
+    failed.link(this);
+    notString.link(this);
+    nonCell.link(this);
+    
+    linkSlowCase(iter); // vector length check
+    linkSlowCase(iter); // empty value
+    
+    Label slowPath = label();
+    
+    emitGetVirtualRegister(base, regT0);
+    emitGetVirtualRegister(property, regT1);
+    Call call = callOperation(operationGetByValOptimize, dst, regT0, regT1, byValInfo);
+
+    m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
+    m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
+    m_byValInstructionIndex++;
+
+    emitValueProfilingSite();
+}
+
+void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, RegisterID offset, RegisterID scratch, FinalObjectMode finalObjectMode)
+{
+    ASSERT(sizeof(JSValue) == 8);
+    
+    if (finalObjectMode == MayBeFinal) {
+        Jump isInline = branch32(LessThan, offset, TrustedImm32(firstOutOfLineOffset));
+        loadPtr(Address(base, JSObject::butterflyOffset()), scratch);
+        neg32(offset);
+        Jump done = jump();
+        isInline.link(this);
+        addPtr(TrustedImm32(JSObject::offsetOfInlineStorage() - (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), base, scratch);
+        done.link(this);
+    } else {
+        if (!ASSERT_DISABLED) {
+            Jump isOutOfLine = branch32(GreaterThanOrEqual, offset, TrustedImm32(firstOutOfLineOffset));
+            abortWithReason(JITOffsetIsNotOutOfLine);
+            isOutOfLine.link(this);
+        }
+        loadPtr(Address(base, JSObject::butterflyOffset()), scratch);
+        neg32(offset);
+    }
+    signExtend32ToPtr(offset, offset);
+    load64(BaseIndex(scratch, offset, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)), result);
+}
+
+void JIT::emit_op_put_by_val(Instruction* currentInstruction)
+{
+    int base = currentInstruction[1].u.operand;
+    int property = currentInstruction[2].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    ByValInfo* byValInfo = m_codeBlock->addByValInfo();
+
+    emitGetVirtualRegisters(base, regT0, property, regT1);
+    emitJumpSlowCaseIfNotImmediateInteger(regT1);
+    // See comment in op_get_by_val.
+    zeroExtend32ToPtr(regT1, regT1);
+    emitJumpSlowCaseIfNotJSCell(regT0, base);
+    emitArrayProfilingSiteWithCell(regT0, regT2, profile);
+    and32(TrustedImm32(IndexingShapeMask), regT2);
+    
+    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(byValInfo, m_bytecodeOffset, PatchableJump(), badType, mode, profile, done, done));
+}
+
+JIT::JumpList JIT::emitGenericContiguousPutByVal(Instruction* currentInstruction, PatchableJump& badType, IndexingType indexingShape)
+{
+    int value = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    
+    JumpList slowCases;
+
+    badType = patchableBranch32(NotEqual, regT2, TrustedImm32(indexingShape));
+    
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
+    Jump outOfBounds = branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfPublicLength()));
+
+    Label storeResult = label();
+    emitGetVirtualRegister(value, regT3);
+    switch (indexingShape) {
+    case Int32Shape:
+        slowCases.append(emitJumpIfNotImmediateInteger(regT3));
+        store64(regT3, BaseIndex(regT2, regT1, TimesEight));
+        break;
+    case DoubleShape: {
+        Jump notInt = emitJumpIfNotImmediateInteger(regT3);
+        convertInt32ToDouble(regT3, fpRegT0);
+        Jump ready = jump();
+        notInt.link(this);
+        add64(tagTypeNumberRegister, regT3);
+        move64ToDouble(regT3, fpRegT0);
+        slowCases.append(branchDouble(DoubleNotEqualOrUnordered, fpRegT0, fpRegT0));
+        ready.link(this);
+        storeDouble(fpRegT0, BaseIndex(regT2, regT1, TimesEight));
+        break;
+    }
+    case ContiguousShape:
+        store64(regT3, BaseIndex(regT2, regT1, TimesEight));
+        emitWriteBarrier(currentInstruction[1].u.operand, value, ShouldFilterValue);
+        break;
+    default:
+        CRASH();
+        break;
+    }
+    
+    Jump done = jump();
+    outOfBounds.link(this);
+    
+    slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, Butterfly::offsetOfVectorLength())));
+    
+    emitArrayProfileStoreToHoleSpecialCase(profile);
+    
+    add32(TrustedImm32(1), regT1, regT3);
+    store32(regT3, Address(regT2, Butterfly::offsetOfPublicLength()));
+    jump().linkTo(storeResult, this);
+    
+    done.link(this);
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitArrayStoragePutByVal(Instruction* currentInstruction, PatchableJump& badType)
+{
+    int value = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    
+    JumpList slowCases;
+    
+    badType = patchableBranch32(NotEqual, regT2, TrustedImm32(ArrayStorageShape));
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT2);
+    slowCases.append(branch32(AboveOrEqual, regT1, Address(regT2, ArrayStorage::vectorLengthOffset())));
+
+    Jump empty = branchTest64(Zero, BaseIndex(regT2, regT1, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
+
+    Label storeResult(this);
+    emitGetVirtualRegister(value, regT3);
+    store64(regT3, BaseIndex(regT2, regT1, TimesEight, OBJECT_OFFSETOF(ArrayStorage, m_vector[0])));
+    emitWriteBarrier(currentInstruction[1].u.operand, value, ShouldFilterValue);
+    Jump end = jump();
+    
+    empty.link(this);
+    emitArrayProfileStoreToHoleSpecialCase(profile);
+    add32(TrustedImm32(1), Address(regT2, ArrayStorage::numValuesInVectorOffset()));
+    branch32(Below, regT1, Address(regT2, ArrayStorage::lengthOffset())).linkTo(storeResult, this);
+
+    add32(TrustedImm32(1), regT1);
+    store32(regT1, Address(regT2, ArrayStorage::lengthOffset()));
+    sub32(TrustedImm32(1), regT1);
+    jump().linkTo(storeResult, this);
+
+    end.link(this);
+    
+    return slowCases;
+}
+
+void JIT::emitSlow_op_put_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    int base = currentInstruction[1].u.operand;
+    int property = currentInstruction[2].u.operand;
+    int value = currentInstruction[3].u.operand;
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    ByValInfo* byValInfo = m_byValCompilationInfo[m_byValInstructionIndex].byValInfo;
+
+    linkSlowCase(iter); // property int32 check
+    linkSlowCaseIfNotJSCell(iter, base); // base cell check
+    linkSlowCase(iter); // base not array check
+    
+    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();
+
+    emitGetVirtualRegister(property, regT1);
+    emitGetVirtualRegister(value, regT2);
+    bool isDirect = m_interpreter->getOpcodeID(currentInstruction->u.opcode) == op_put_by_val_direct;
+    Call call = callOperation(isDirect ? operationDirectPutByVal : operationPutByVal, regT0, regT1, regT2, byValInfo);
+
+    m_byValCompilationInfo[m_byValInstructionIndex].slowPathTarget = slowPath;
+    m_byValCompilationInfo[m_byValInstructionIndex].returnAddress = call;
+    m_byValInstructionIndex++;
+}
+
+void JIT::emit_op_put_by_index(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+    emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
+    callOperation(operationPutByIndex, regT0, currentInstruction[2].u.operand, regT1);
+}
+
+void JIT::emit_op_put_getter_by_id(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+    emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
+    callOperation(operationPutGetterById, regT0, &m_codeBlock->identifier(currentInstruction[2].u.operand), regT1);
+}
+
+void JIT::emit_op_put_setter_by_id(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+    emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
+    callOperation(operationPutSetterById, regT0, &m_codeBlock->identifier(currentInstruction[2].u.operand), regT1);
+}
+
+void JIT::emit_op_put_getter_setter(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+    emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
+    emitGetVirtualRegister(currentInstruction[4].u.operand, regT2);
+    callOperation(operationPutGetterSetter, regT0, &m_codeBlock->identifier(currentInstruction[2].u.operand), regT1, regT2);
+}
+
+void JIT::emit_op_del_by_id(Instruction* currentInstruction)
+{
+    int dst = currentInstruction[1].u.operand;
+    int base = currentInstruction[2].u.operand;
+    int property = currentInstruction[3].u.operand;
+    emitGetVirtualRegister(base, regT0);
+    callOperation(operationDeleteById, dst, regT0, &m_codeBlock->identifier(property));
+}
+
+void JIT::emit_op_get_by_id(Instruction* currentInstruction)
+{
+    int resultVReg = currentInstruction[1].u.operand;
+    int baseVReg = currentInstruction[2].u.operand;
+    const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
+
+    emitGetVirtualRegister(baseVReg, regT0);
+    
+    emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
+    
+    if (*ident == m_vm->propertyNames->length && shouldEmitProfiling())
+        emitArrayProfilingSiteForBytecodeIndexWithCell(regT0, regT1, m_bytecodeOffset);
+
+    JITGetByIdGenerator gen(
+        m_codeBlock, CodeOrigin(m_bytecodeOffset), RegisterSet::specialRegisters(),
+        JSValueRegs(regT0), JSValueRegs(regT0), DontSpill);
+    gen.generateFastPath(*this);
+    addSlowCase(gen.slowPathJump());
+    m_getByIds.append(gen);
+
+    emitValueProfilingSite();
+    emitPutVirtualRegister(resultVReg);
+    assertStackPointerOffset();
+}
+
+void JIT::emitSlow_op_get_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    int resultVReg = currentInstruction[1].u.operand;
+    int baseVReg = currentInstruction[2].u.operand;
+    const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
+
+    linkSlowCaseIfNotJSCell(iter, baseVReg);
+    linkSlowCase(iter);
+
+    JITGetByIdGenerator& gen = m_getByIds[m_getByIdIndex++];
+    
+    Label coldPathBegin = label();
+    
+    Call call = callOperation(WithProfile, operationGetByIdOptimize, resultVReg, gen.stubInfo(), regT0, ident->impl());
+
+    gen.reportSlowPathCall(coldPathBegin, call);
+}
+
+void JIT::emit_op_put_by_id(Instruction* currentInstruction)
+{
+    int baseVReg = currentInstruction[1].u.operand;
+    int valueVReg = currentInstruction[3].u.operand;
+    unsigned direct = currentInstruction[8].u.operand;
+
+    emitWriteBarrier(baseVReg, valueVReg, ShouldFilterBase);
+
+    // In order to be able to patch both the Structure, and the object offset, we store one pointer,
+    // to just after the arguments have been loaded into registers 'hotPathBegin', and we generate code
+    // such that the Structure & offset are always at the same distance from this.
+
+    emitGetVirtualRegisters(baseVReg, regT0, valueVReg, regT1);
+
+    // Jump to a slow case if either the base object is an immediate, or if the Structure does not match.
+    emitJumpSlowCaseIfNotJSCell(regT0, baseVReg);
+
+    JITPutByIdGenerator gen(
+        m_codeBlock, CodeOrigin(m_bytecodeOffset), RegisterSet::specialRegisters(),
+        JSValueRegs(regT0), JSValueRegs(regT1), regT2, DontSpill, m_codeBlock->ecmaMode(),
+        direct ? Direct : NotDirect);
+    
+    gen.generateFastPath(*this);
+    addSlowCase(gen.slowPathJump());
+    
+    m_putByIds.append(gen);
+}
+
+void JIT::emitSlow_op_put_by_id(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    int baseVReg = currentInstruction[1].u.operand;
+    const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[2].u.operand));
+
+    linkSlowCaseIfNotJSCell(iter, baseVReg);
+    linkSlowCase(iter);
+
+    Label coldPathBegin(this);
+    
+    JITPutByIdGenerator& gen = m_putByIds[m_putByIdIndex++];
+
+    Call call = callOperation(
+        gen.slowPathFunction(), gen.stubInfo(), regT1, regT0, ident->impl());
+
+    gen.reportSlowPathCall(coldPathBegin, call);
+}
+
+// Compile a store into an object's property storage.  May overwrite the
+// value in objectReg.
+void JIT::compilePutDirectOffset(RegisterID base, RegisterID value, PropertyOffset cachedOffset)
+{
+    if (isInlineOffset(cachedOffset)) {
+        store64(value, Address(base, JSObject::offsetOfInlineStorage() + sizeof(JSValue) * offsetInInlineStorage(cachedOffset)));
+        return;
+    }
+    
+    loadPtr(Address(base, JSObject::butterflyOffset()), base);
+    store64(value, Address(base, sizeof(JSValue) * offsetInButterfly(cachedOffset)));
+}
+
+// Compile a load from an object's property storage.  May overwrite base.
+void JIT::compileGetDirectOffset(RegisterID base, RegisterID result, PropertyOffset cachedOffset)
+{
+    if (isInlineOffset(cachedOffset)) {
+        load64(Address(base, JSObject::offsetOfInlineStorage() + sizeof(JSValue) * offsetInInlineStorage(cachedOffset)), result);
+        return;
+    }
+    
+    loadPtr(Address(base, JSObject::butterflyOffset()), result);
+    load64(Address(result, sizeof(JSValue) * offsetInButterfly(cachedOffset)), result);
+}
+
+void JIT::compileGetDirectOffset(JSObject* base, RegisterID result, PropertyOffset cachedOffset)
+{
+    if (isInlineOffset(cachedOffset)) {
+        load64(base->locationForOffset(cachedOffset), result);
+        return;
+    }
+    
+    loadPtr(base->butterflyAddress(), result);
+    load64(Address(result, offsetInButterfly(cachedOffset) * sizeof(WriteBarrier<Unknown>)), result);
+}
+
+void JIT::emitVarInjectionCheck(bool needsVarInjectionChecks)
+{
+    if (!needsVarInjectionChecks)
+        return;
+    addSlowCase(branch8(Equal, AbsoluteAddress(m_codeBlock->globalObject()->varInjectionWatchpoint()->addressOfState()), TrustedImm32(IsInvalidated)));
+}
+
+void JIT::emitResolveClosure(int dst, int scope, bool needsVarInjectionChecks, unsigned depth)
+{
+    emitVarInjectionCheck(needsVarInjectionChecks);
+    emitGetVirtualRegister(scope, regT0);
+    for (unsigned i = 0; i < depth; ++i)
+        loadPtr(Address(regT0, JSScope::offsetOfNext()), regT0);
+    emitPutVirtualRegister(dst);
+}
+
+void JIT::emit_op_resolve_scope(Instruction* currentInstruction)
+{
+    int dst = currentInstruction[1].u.operand;
+    int scope = currentInstruction[2].u.operand;
+    ResolveType resolveType = static_cast<ResolveType>(currentInstruction[4].u.operand);
+    unsigned depth = currentInstruction[5].u.operand;
+
+    switch (resolveType) {
+    case GlobalProperty:
+    case GlobalVar:
+    case GlobalPropertyWithVarInjectionChecks:
+    case GlobalVarWithVarInjectionChecks:
+        emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
+        move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
+        emitPutVirtualRegister(dst);
+        break;
+    case ClosureVar:
+    case ClosureVarWithVarInjectionChecks:
+        emitResolveClosure(dst, scope, needsVarInjectionChecks(resolveType), depth);
+        break;
+    case Dynamic:
+        addSlowCase(jump());
+        break;
+    case LocalClosureVar:
+        RELEASE_ASSERT_NOT_REACHED();
+    }
+}
+
+void JIT::emitSlow_op_resolve_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    int dst = currentInstruction[1].u.operand;
+    ResolveType resolveType = static_cast<ResolveType>(currentInstruction[4].u.operand);
+
+    if (resolveType == GlobalProperty || resolveType == GlobalVar || resolveType == ClosureVar)
+        return;
+
+    linkSlowCase(iter);
+    int32_t scope = currentInstruction[2].u.operand;
+    int32_t identifierIndex = currentInstruction[3].u.operand;
+    callOperation(operationResolveScope, dst, scope, identifierIndex);
+}
+
+void JIT::emitLoadWithStructureCheck(int scope, Structure** structureSlot)
+{
+    emitGetVirtualRegister(scope, regT0);
+    loadPtr(structureSlot, regT1);
+    addSlowCase(branchTestPtr(Zero, regT1));
+    load32(Address(regT1, Structure::structureIDOffset()), regT1);
+    addSlowCase(branch32(NotEqual, Address(regT0, JSCell::structureIDOffset()), regT1));
+}
+
+void JIT::emitGetGlobalProperty(uintptr_t* operandSlot)
+{
+    load32(operandSlot, regT1);
+    compileGetDirectOffset(regT0, regT0, regT1, regT2, KnownNotFinal);
+}
+
+void JIT::emitGetGlobalVar(uintptr_t operand)
+{
+    loadPtr(reinterpret_cast<void*>(operand), regT0);
+}
+
+void JIT::emitGetClosureVar(int scope, uintptr_t operand)
+{
+    emitGetVirtualRegister(scope, regT0);
+    loadPtr(Address(regT0, JSEnvironmentRecord::offsetOfVariables() + operand * sizeof(Register)), regT0);
+}
+
+void JIT::emit_op_get_from_scope(Instruction* currentInstruction)
+{
+    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;
+    case LocalClosureVar:
+        RELEASE_ASSERT_NOT_REACHED();
+    }
+    emitPutVirtualRegister(dst);
+    emitValueProfilingSite();
+}
+
+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;
+
+    if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks)
+        linkSlowCase(iter);
+    linkSlowCase(iter);
+    callOperation(WithProfile, operationGetFromScope, dst, currentInstruction);
+}
+
+void JIT::emitPutGlobalProperty(uintptr_t* operandSlot, int value)
+{
+    emitGetVirtualRegister(value, regT2);
+
+    loadPtr(Address(regT0, JSObject::butterflyOffset()), regT0);
+    loadPtr(operandSlot, regT1);
+    negPtr(regT1);
+    storePtr(regT2, BaseIndex(regT0, regT1, TimesEight, (firstOutOfLineOffset - 2) * sizeof(EncodedJSValue)));
+}
+
+void JIT::emitPutGlobalVar(uintptr_t operand, int value, WatchpointSet* set)
+{
+    emitGetVirtualRegister(value, regT0);
+    emitNotifyWrite(set);
+    storePtr(regT0, reinterpret_cast<void*>(operand));
+}
+
+void JIT::emitPutClosureVar(int scope, uintptr_t operand, int value, WatchpointSet* set)
+{
+    emitGetVirtualRegister(value, regT1);
+    emitGetVirtualRegister(scope, regT0);
+    emitNotifyWrite(set);
+    storePtr(regT1, Address(regT0, JSEnvironmentRecord::offsetOfVariables() + operand * sizeof(Register)));
+}
+
+void JIT::emit_op_put_to_scope(Instruction* currentInstruction)
+{
+    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 LocalClosureVar:
+    case ClosureVar:
+    case ClosureVarWithVarInjectionChecks:
+        emitWriteBarrier(scope, value, ShouldFilterValue);
+        emitVarInjectionCheck(needsVarInjectionChecks(resolveType));
+        emitPutClosureVar(scope, *operandSlot, value, currentInstruction[5].u.watchpointSet);
+        break;
+    case Dynamic:
+        addSlowCase(jump());
+        break;
+    }
+}
+
+void JIT::emitSlow_op_put_to_scope(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    ResolveType resolveType = ResolveModeAndType(currentInstruction[4].u.operand).type();
+    unsigned linkCount = 0;
+    if (resolveType != GlobalVar && resolveType != ClosureVar && resolveType != LocalClosureVar)
+        linkCount++;
+    if ((resolveType == GlobalVar || resolveType == GlobalVarWithVarInjectionChecks || resolveType == LocalClosureVar)
+        && currentInstruction[5].u.watchpointSet->state() != IsInvalidated)
+        linkCount++;
+    if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks)
+        linkCount++;
+    if (!linkCount)
+        return;
+    while (linkCount--)
+        linkSlowCase(iter);
+    callOperation(operationPutToScope, currentInstruction);
+}
+
+void JIT::emit_op_get_from_arguments(Instruction* currentInstruction)
+{
+    int dst = currentInstruction[1].u.operand;
+    int arguments = currentInstruction[2].u.operand;
+    int index = currentInstruction[3].u.operand;
+    
+    emitGetVirtualRegister(arguments, regT0);
+    load64(Address(regT0, DirectArguments::storageOffset() + index * sizeof(WriteBarrier<Unknown>)), regT0);
+    emitValueProfilingSite();
+    emitPutVirtualRegister(dst);
+}
+
+void JIT::emit_op_put_to_arguments(Instruction* currentInstruction)
+{
+    int arguments = currentInstruction[1].u.operand;
+    int index = currentInstruction[2].u.operand;
+    int value = currentInstruction[3].u.operand;
+    
+    emitWriteBarrier(arguments, value, ShouldFilterValue);
+    
+    emitGetVirtualRegister(arguments, regT0);
+    emitGetVirtualRegister(value, regT1);
+    store64(regT1, Address(regT0, DirectArguments::storageOffset() + index * sizeof(WriteBarrier<Unknown>)));
+}
+
+#endif // USE(JSVALUE64)
+
+#if USE(JSVALUE64)
+void JIT::emitWriteBarrier(unsigned owner, unsigned value, WriteBarrierMode mode)
+{
+#if ENABLE(GGC)
+    Jump valueNotCell;
+    if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue) {
+        emitGetVirtualRegister(value, regT0);
+        valueNotCell = branchTest64(NonZero, regT0, tagMaskRegister);
+    }
+    
+    emitGetVirtualRegister(owner, regT0);
+    Jump ownerNotCell;
+    if (mode == ShouldFilterBaseAndValue || mode == ShouldFilterBase)
+        ownerNotCell = branchTest64(NonZero, regT0, tagMaskRegister);
+
+    Jump ownerIsRememberedOrInEden = jumpIfIsRememberedOrInEden(regT0);
+    callOperation(operationUnconditionalWriteBarrier, regT0);
+    ownerIsRememberedOrInEden.link(this);
+
+    if (mode == ShouldFilterBaseAndValue || mode == ShouldFilterBase)
+        ownerNotCell.link(this);
+    if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue) 
+        valueNotCell.link(this);
+#else
+    UNUSED_PARAM(owner);
+    UNUSED_PARAM(value);
+    UNUSED_PARAM(mode);
+#endif
+}
+
+void JIT::emitWriteBarrier(JSCell* owner, unsigned value, WriteBarrierMode mode)
+{
+#if ENABLE(GGC)
+    emitGetVirtualRegister(value, regT0);
+    Jump valueNotCell;
+    if (mode == ShouldFilterValue)
+        valueNotCell = branchTest64(NonZero, regT0, tagMaskRegister);
+
+    emitWriteBarrier(owner);
+
+    if (mode == ShouldFilterValue) 
+        valueNotCell.link(this);
+#else
+    UNUSED_PARAM(owner);
+    UNUSED_PARAM(value);
+    UNUSED_PARAM(mode);
+#endif
+}
+
+#else // USE(JSVALUE64)
+
+void JIT::emitWriteBarrier(unsigned owner, unsigned value, WriteBarrierMode mode)
+{
+#if ENABLE(GGC)
+    Jump valueNotCell;
+    if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue) {
+        emitLoadTag(value, regT0);
+        valueNotCell = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
+    }
+    
+    emitLoad(owner, regT0, regT1);
+    Jump ownerNotCell;
+    if (mode == ShouldFilterBase || mode == ShouldFilterBaseAndValue)
+        ownerNotCell = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
+
+    Jump ownerIsRememberedOrInEden = jumpIfIsRememberedOrInEden(regT1);
+    callOperation(operationUnconditionalWriteBarrier, regT1);
+    ownerIsRememberedOrInEden.link(this);
+
+    if (mode == ShouldFilterBase || mode == ShouldFilterBaseAndValue)
+        ownerNotCell.link(this);
+    if (mode == ShouldFilterValue || mode == ShouldFilterBaseAndValue) 
+        valueNotCell.link(this);
+#else
+    UNUSED_PARAM(owner);
+    UNUSED_PARAM(value);
+    UNUSED_PARAM(mode);
+#endif
+}
+
+void JIT::emitWriteBarrier(JSCell* owner, unsigned value, WriteBarrierMode mode)
+{
+#if ENABLE(GGC)
+    Jump valueNotCell;
+    if (mode == ShouldFilterValue) {
+        emitLoadTag(value, regT0);
+        valueNotCell = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
+    }
+
+    emitWriteBarrier(owner);
+
+    if (mode == ShouldFilterValue) 
+        valueNotCell.link(this);
+#else
+    UNUSED_PARAM(owner);
+    UNUSED_PARAM(value);
+    UNUSED_PARAM(mode);
+#endif
+}
+
+#endif // USE(JSVALUE64)
+
+void JIT::emitWriteBarrier(JSCell* owner)
+{
+#if ENABLE(GGC)
+    if (!MarkedBlock::blockFor(owner)->isMarked(owner)) {
+        Jump ownerIsRememberedOrInEden = jumpIfIsRememberedOrInEden(owner);
+        callOperation(operationUnconditionalWriteBarrier, owner);
+        ownerIsRememberedOrInEden.link(this);
+    } else
+        callOperation(operationUnconditionalWriteBarrier, owner);
+#else
+    UNUSED_PARAM(owner);
+#endif // ENABLE(GGC)
+}
+
+void JIT::privateCompileGetByVal(ByValInfo* byValInfo, ReturnAddressPtr returnAddress, JITArrayMode arrayMode)
+{
+    Instruction* currentInstruction = m_codeBlock->instructions().begin() + byValInfo->bytecodeIndex;
+    
+    PatchableJump badType;
+    JumpList slowCases;
+    
+    switch (arrayMode) {
+    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;
+    case JITDirectArguments:
+        slowCases = emitDirectArgumentsGetByVal(currentInstruction, badType);
+        break;
+    case JITScopedArguments:
+        slowCases = emitScopedArgumentsGetByVal(currentInstruction, badType);
+        break;
+    default:
+        TypedArrayType type = typedArrayTypeForJITArrayMode(arrayMode);
+        if (isInt(type))
+            slowCases = emitIntTypedArrayGetByVal(currentInstruction, badType, type);
+        else 
+            slowCases = emitFloatTypedArrayGetByVal(currentInstruction, badType, type);
+        break;
+    }
+    
+    Jump done = jump();
+
+    LinkBuffer patchBuffer(*m_vm, *this, m_codeBlock);
+    
+    patchBuffer.link(badType, CodeLocationLabel(MacroAssemblerCodePtr::createFromExecutableAddress(returnAddress.value())).labelAtOffset(byValInfo->returnAddressToSlowPath));
+    patchBuffer.link(slowCases, CodeLocationLabel(MacroAssemblerCodePtr::createFromExecutableAddress(returnAddress.value())).labelAtOffset(byValInfo->returnAddressToSlowPath));
+    
+    patchBuffer.link(done, byValInfo->badTypeJump.labelAtOffset(byValInfo->badTypeJumpToDone));
+    
+    byValInfo->stubRoutine = FINALIZE_CODE_FOR_STUB(
+        m_codeBlock, patchBuffer,
+        ("Baseline get_by_val stub for %s, return point %p", toCString(*m_codeBlock).data(), returnAddress.value()));
+    
+    RepatchBuffer repatchBuffer(m_codeBlock);
+    repatchBuffer.relink(byValInfo->badTypeJump, CodeLocationLabel(byValInfo->stubRoutine->code().code()));
+    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(operationGetByValGeneric));
+}
+
+void JIT::privateCompileGetByValWithCachedId(ByValInfo* byValInfo, ReturnAddressPtr returnAddress, const Identifier& propertyName)
+{
+    Instruction* currentInstruction = m_codeBlock->instructions().begin() + byValInfo->bytecodeIndex;
+
+    Jump fastDoneCase;
+    Jump slowDoneCase;
+    JumpList slowCases;
+
+    JITGetByIdGenerator gen = emitGetByValWithCachedId(currentInstruction, propertyName, fastDoneCase, slowDoneCase, slowCases);
+
+    ConcurrentJITLocker locker(m_codeBlock->m_lock);
+    LinkBuffer patchBuffer(*m_vm, *this, m_codeBlock);
+    patchBuffer.link(slowCases, CodeLocationLabel(MacroAssemblerCodePtr::createFromExecutableAddress(returnAddress.value())).labelAtOffset(byValInfo->returnAddressToSlowPath));
+    patchBuffer.link(fastDoneCase, byValInfo->badTypeJump.labelAtOffset(byValInfo->badTypeJumpToDone));
+    patchBuffer.link(slowDoneCase, byValInfo->badTypeJump.labelAtOffset(byValInfo->badTypeJumpToNextHotPath));
+
+    for (const auto& callSite : m_calls) {
+        if (callSite.to)
+            patchBuffer.link(callSite.from, FunctionPtr(callSite.to));
+    }
+    gen.finalize(patchBuffer);
+
+    byValInfo->stubRoutine = FINALIZE_CODE_FOR_STUB(
+        m_codeBlock, patchBuffer,
+        ("Baseline get_by_val with cached property name '%s' stub for %s, return point %p", propertyName.impl()->utf8().data(), toCString(*m_codeBlock).data(), returnAddress.value()));
+    byValInfo->cachedId = propertyName;
+    byValInfo->stubInfo = gen.stubInfo();
+
+    RepatchBuffer repatchBuffer(m_codeBlock);
+    repatchBuffer.relink(byValInfo->notIndexJump, CodeLocationLabel(byValInfo->stubRoutine->code().code()));
+    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(operationGetByValGeneric));
+}
+
+void JIT::privateCompilePutByVal(ByValInfo* byValInfo, ReturnAddressPtr returnAddress, JITArrayMode arrayMode)
+{
+    Instruction* currentInstruction = m_codeBlock->instructions().begin() + byValInfo->bytecodeIndex;
+    
+    PatchableJump badType;
+    JumpList slowCases;
+
+#if ENABLE(GGC)
+    bool needsLinkForWriteBarrier = false;
+#endif
+
+    switch (arrayMode) {
+    case JITInt32:
+        slowCases = emitInt32PutByVal(currentInstruction, badType);
+        break;
+    case JITDouble:
+        slowCases = emitDoublePutByVal(currentInstruction, badType);
+        break;
+    case JITContiguous:
+        slowCases = emitContiguousPutByVal(currentInstruction, badType);
+#if ENABLE(GGC)
+        needsLinkForWriteBarrier = true;
+#endif
+        break;
+    case JITArrayStorage:
+        slowCases = emitArrayStoragePutByVal(currentInstruction, badType);
+#if ENABLE(GGC)
+        needsLinkForWriteBarrier = true;
+#endif
+        break;
+    default:
+        TypedArrayType type = typedArrayTypeForJITArrayMode(arrayMode);
+        if (isInt(type))
+            slowCases = emitIntTypedArrayPutByVal(currentInstruction, badType, type);
+        else 
+            slowCases = emitFloatTypedArrayPutByVal(currentInstruction, badType, type);
+        break;
+    }
+    
+    Jump done = jump();
+
+    LinkBuffer patchBuffer(*m_vm, *this, m_codeBlock);
+    patchBuffer.link(badType, CodeLocationLabel(MacroAssemblerCodePtr::createFromExecutableAddress(returnAddress.value())).labelAtOffset(byValInfo->returnAddressToSlowPath));
+    patchBuffer.link(slowCases, CodeLocationLabel(MacroAssemblerCodePtr::createFromExecutableAddress(returnAddress.value())).labelAtOffset(byValInfo->returnAddressToSlowPath));
+    patchBuffer.link(done, byValInfo->badTypeJump.labelAtOffset(byValInfo->badTypeJumpToDone));
+#if ENABLE(GGC)
+    if (needsLinkForWriteBarrier) {
+        ASSERT(m_calls.last().to == operationUnconditionalWriteBarrier);
+        patchBuffer.link(m_calls.last().from, operationUnconditionalWriteBarrier);
+    }
+#endif
+    
+    bool isDirect = m_interpreter->getOpcodeID(currentInstruction->u.opcode) == op_put_by_val_direct;
+    if (!isDirect) {
+        byValInfo->stubRoutine = FINALIZE_CODE_FOR_STUB(
+            m_codeBlock, patchBuffer,
+            ("Baseline put_by_val stub for %s, return point %p", toCString(*m_codeBlock).data(), returnAddress.value()));
+        
+    } else {
+        byValInfo->stubRoutine = FINALIZE_CODE_FOR_STUB(
+            m_codeBlock, patchBuffer,
+            ("Baseline put_by_val_direct stub for %s, return point %p", toCString(*m_codeBlock).data(), returnAddress.value()));
+    }
+    RepatchBuffer repatchBuffer(m_codeBlock);
+    repatchBuffer.relink(byValInfo->badTypeJump, CodeLocationLabel(byValInfo->stubRoutine->code().code()));
+    repatchBuffer.relinkCallerToFunction(returnAddress, FunctionPtr(isDirect ? operationDirectPutByValGeneric : operationPutByValGeneric));
+}
+
+JIT::JumpList JIT::emitDirectArgumentsGetByVal(Instruction*, PatchableJump& badType)
+{
+    JumpList slowCases;
+    
+#if USE(JSVALUE64)
+    RegisterID base = regT0;
+    RegisterID property = regT1;
+    JSValueRegs result = JSValueRegs(regT0);
+    RegisterID scratch = regT3;
+#else
+    RegisterID base = regT0;
+    RegisterID property = regT2;
+    JSValueRegs result = JSValueRegs(regT1, regT0);
+    RegisterID scratch = regT3;
+#endif
+
+    load8(Address(base, JSCell::typeInfoTypeOffset()), scratch);
+    badType = patchableBranch32(NotEqual, scratch, TrustedImm32(DirectArgumentsType));
+    
+    slowCases.append(branch32(AboveOrEqual, property, Address(base, DirectArguments::offsetOfLength())));
+    slowCases.append(branchTestPtr(NonZero, Address(base, DirectArguments::offsetOfOverrides())));
+    
+    zeroExtend32ToPtr(property, scratch);
+    loadValue(BaseIndex(base, scratch, TimesEight, DirectArguments::storageOffset()), result);
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitScopedArgumentsGetByVal(Instruction*, PatchableJump& badType)
+{
+    JumpList slowCases;
+    
+#if USE(JSVALUE64)
+    RegisterID base = regT0;
+    RegisterID property = regT1;
+    JSValueRegs result = JSValueRegs(regT0);
+    RegisterID scratch = regT3;
+    RegisterID scratch2 = regT4;
+#else
+    RegisterID base = regT0;
+    RegisterID property = regT2;
+    JSValueRegs result = JSValueRegs(regT1, regT0);
+    RegisterID scratch = regT3;
+    RegisterID scratch2 = regT4;
+#endif
+
+    load8(Address(base, JSCell::typeInfoTypeOffset()), scratch);
+    badType = patchableBranch32(NotEqual, scratch, TrustedImm32(ScopedArgumentsType));
+    slowCases.append(branch32(AboveOrEqual, property, Address(base, ScopedArguments::offsetOfTotalLength())));
+    
+    loadPtr(Address(base, ScopedArguments::offsetOfTable()), scratch);
+    load32(Address(scratch, ScopedArgumentsTable::offsetOfLength()), scratch2);
+    Jump overflowCase = branch32(AboveOrEqual, property, scratch2);
+    loadPtr(Address(base, ScopedArguments::offsetOfScope()), scratch2);
+    loadPtr(Address(scratch, ScopedArgumentsTable::offsetOfArguments()), scratch);
+    load32(BaseIndex(scratch, property, TimesFour), scratch);
+    slowCases.append(branch32(Equal, scratch, TrustedImm32(ScopeOffset::invalidOffset)));
+    loadValue(BaseIndex(scratch2, scratch, TimesEight, JSEnvironmentRecord::offsetOfVariables()), result);
+    Jump done = jump();
+    overflowCase.link(this);
+    sub32(property, scratch2);
+    neg32(scratch2);
+    loadValue(BaseIndex(base, scratch2, TimesEight, ScopedArguments::overflowStorageOffset()), result);
+    slowCases.append(branchIfEmpty(result));
+    done.link(this);
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitIntTypedArrayGetByVal(Instruction*, PatchableJump& badType, TypedArrayType type)
+{
+    ASSERT(isInt(type));
+    
+    // The best way to test the array type is to use the classInfo. We need to do so without
+    // clobbering the register that holds the indexing type, base, and property.
+
+#if USE(JSVALUE64)
+    RegisterID base = regT0;
+    RegisterID property = regT1;
+    RegisterID resultPayload = regT0;
+    RegisterID scratch = regT3;
+#else
+    RegisterID base = regT0;
+    RegisterID property = regT2;
+    RegisterID resultPayload = regT0;
+    RegisterID resultTag = regT1;
+    RegisterID scratch = regT3;
+#endif
+    
+    JumpList slowCases;
+    
+    load8(Address(base, JSCell::typeInfoTypeOffset()), scratch);
+    badType = patchableBranch32(NotEqual, scratch, TrustedImm32(typeForTypedArrayType(type)));
+    slowCases.append(branch32(AboveOrEqual, property, Address(base, JSArrayBufferView::offsetOfLength())));
+    loadPtr(Address(base, JSArrayBufferView::offsetOfVector()), base);
+    
+    switch (elementSize(type)) {
+    case 1:
+        if (isSigned(type))
+            load8SignedExtendTo32(BaseIndex(base, property, TimesOne), resultPayload);
+        else
+            load8(BaseIndex(base, property, TimesOne), resultPayload);
+        break;
+    case 2:
+        if (isSigned(type))
+            load16SignedExtendTo32(BaseIndex(base, property, TimesTwo), resultPayload);
+        else
+            load16(BaseIndex(base, property, TimesTwo), resultPayload);
+        break;
+    case 4:
+        load32(BaseIndex(base, property, TimesFour), resultPayload);
+        break;
+    default:
+        CRASH();
+    }
+    
+    Jump done;
+    if (type == TypeUint32) {
+        Jump canBeInt = branch32(GreaterThanOrEqual, resultPayload, TrustedImm32(0));
+        
+        convertInt32ToDouble(resultPayload, fpRegT0);
+        addDouble(AbsoluteAddress(&twoToThe32), fpRegT0);
+#if USE(JSVALUE64)
+        moveDoubleTo64(fpRegT0, resultPayload);
+        sub64(tagTypeNumberRegister, resultPayload);
+#else
+        moveDoubleToInts(fpRegT0, resultPayload, resultTag);
+#endif
+        
+        done = jump();
+        canBeInt.link(this);
+    }
+
+#if USE(JSVALUE64)
+    or64(tagTypeNumberRegister, resultPayload);
+#else
+    move(TrustedImm32(JSValue::Int32Tag), resultTag);
+#endif
+    if (done.isSet())
+        done.link(this);
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitFloatTypedArrayGetByVal(Instruction*, PatchableJump& badType, TypedArrayType type)
+{
+    ASSERT(isFloat(type));
+    
+#if USE(JSVALUE64)
+    RegisterID base = regT0;
+    RegisterID property = regT1;
+    RegisterID resultPayload = regT0;
+    RegisterID scratch = regT3;
+#else
+    RegisterID base = regT0;
+    RegisterID property = regT2;
+    RegisterID resultPayload = regT0;
+    RegisterID resultTag = regT1;
+    RegisterID scratch = regT3;
+#endif
+    
+    JumpList slowCases;
+
+    load8(Address(base, JSCell::typeInfoTypeOffset()), scratch);
+    badType = patchableBranch32(NotEqual, scratch, TrustedImm32(typeForTypedArrayType(type)));
+    slowCases.append(branch32(AboveOrEqual, property, Address(base, JSArrayBufferView::offsetOfLength())));
+    loadPtr(Address(base, JSArrayBufferView::offsetOfVector()), base);
+    
+    switch (elementSize(type)) {
+    case 4:
+        loadFloat(BaseIndex(base, property, TimesFour), fpRegT0);
+        convertFloatToDouble(fpRegT0, fpRegT0);
+        break;
+    case 8: {
+        loadDouble(BaseIndex(base, property, TimesEight), fpRegT0);
+        break;
+    }
+    default:
+        CRASH();
+    }
+    
+    Jump notNaN = branchDouble(DoubleEqual, fpRegT0, fpRegT0);
+    static const double NaN = PNaN;
+    loadDouble(TrustedImmPtr(&NaN), fpRegT0);
+    notNaN.link(this);
+    
+#if USE(JSVALUE64)
+    moveDoubleTo64(fpRegT0, resultPayload);
+    sub64(tagTypeNumberRegister, resultPayload);
+#else
+    moveDoubleToInts(fpRegT0, resultPayload, resultTag);
+#endif
+    return slowCases;    
+}
+
+JIT::JumpList JIT::emitIntTypedArrayPutByVal(Instruction* currentInstruction, PatchableJump& badType, TypedArrayType type)
+{
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    ASSERT(isInt(type));
+    
+    int value = currentInstruction[3].u.operand;
+
+#if USE(JSVALUE64)
+    RegisterID base = regT0;
+    RegisterID property = regT1;
+    RegisterID earlyScratch = regT3;
+    RegisterID lateScratch = regT2;
+#else
+    RegisterID base = regT0;
+    RegisterID property = regT2;
+    RegisterID earlyScratch = regT3;
+    RegisterID lateScratch = regT1;
+#endif
+    
+    JumpList slowCases;
+    
+    load8(Address(base, JSCell::typeInfoTypeOffset()), earlyScratch);
+    badType = patchableBranch32(NotEqual, earlyScratch, TrustedImm32(typeForTypedArrayType(type)));
+    Jump inBounds = branch32(Below, property, Address(base, JSArrayBufferView::offsetOfLength()));
+    emitArrayProfileOutOfBoundsSpecialCase(profile);
+    Jump done = jump();
+    inBounds.link(this);
+    
+#if USE(JSVALUE64)
+    emitGetVirtualRegister(value, earlyScratch);
+    slowCases.append(emitJumpIfNotImmediateInteger(earlyScratch));
+#else
+    emitLoad(value, lateScratch, earlyScratch);
+    slowCases.append(branch32(NotEqual, lateScratch, TrustedImm32(JSValue::Int32Tag)));
+#endif
+    
+    // We would be loading this into base as in get_by_val, except that the slow
+    // path expects the base to be unclobbered.
+    loadPtr(Address(base, JSArrayBufferView::offsetOfVector()), lateScratch);
+    
+    if (isClamped(type)) {
+        ASSERT(elementSize(type) == 1);
+        ASSERT(!isSigned(type));
+        Jump inBounds = branch32(BelowOrEqual, earlyScratch, TrustedImm32(0xff));
+        Jump tooBig = branch32(GreaterThan, earlyScratch, TrustedImm32(0xff));
+        xor32(earlyScratch, earlyScratch);
+        Jump clamped = jump();
+        tooBig.link(this);
+        move(TrustedImm32(0xff), earlyScratch);
+        clamped.link(this);
+        inBounds.link(this);
+    }
+    
+    switch (elementSize(type)) {
+    case 1:
+        store8(earlyScratch, BaseIndex(lateScratch, property, TimesOne));
+        break;
+    case 2:
+        store16(earlyScratch, BaseIndex(lateScratch, property, TimesTwo));
+        break;
+    case 4:
+        store32(earlyScratch, BaseIndex(lateScratch, property, TimesFour));
+        break;
+    default:
+        CRASH();
+    }
+    
+    done.link(this);
+    
+    return slowCases;
+}
+
+JIT::JumpList JIT::emitFloatTypedArrayPutByVal(Instruction* currentInstruction, PatchableJump& badType, TypedArrayType type)
+{
+    ArrayProfile* profile = currentInstruction[4].u.arrayProfile;
+    ASSERT(isFloat(type));
+    
+    int value = currentInstruction[3].u.operand;
+
+#if USE(JSVALUE64)
+    RegisterID base = regT0;
+    RegisterID property = regT1;
+    RegisterID earlyScratch = regT3;
+    RegisterID lateScratch = regT2;
+#else
+    RegisterID base = regT0;
+    RegisterID property = regT2;
+    RegisterID earlyScratch = regT3;
+    RegisterID lateScratch = regT1;
+#endif
+    
+    JumpList slowCases;
+    
+    load8(Address(base, JSCell::typeInfoTypeOffset()), earlyScratch);
+    badType = patchableBranch32(NotEqual, earlyScratch, TrustedImm32(typeForTypedArrayType(type)));
+    Jump inBounds = branch32(Below, property, Address(base, JSArrayBufferView::offsetOfLength()));
+    emitArrayProfileOutOfBoundsSpecialCase(profile);
+    Jump done = jump();
+    inBounds.link(this);
+    
+#if USE(JSVALUE64)
+    emitGetVirtualRegister(value, earlyScratch);
+    Jump doubleCase = emitJumpIfNotImmediateInteger(earlyScratch);
+    convertInt32ToDouble(earlyScratch, fpRegT0);
+    Jump ready = jump();
+    doubleCase.link(this);
+    slowCases.append(emitJumpIfNotImmediateNumber(earlyScratch));
+    add64(tagTypeNumberRegister, earlyScratch);
+    move64ToDouble(earlyScratch, fpRegT0);
+    ready.link(this);
+#else
+    emitLoad(value, lateScratch, earlyScratch);
+    Jump doubleCase = branch32(NotEqual, lateScratch, TrustedImm32(JSValue::Int32Tag));
+    convertInt32ToDouble(earlyScratch, fpRegT0);
+    Jump ready = jump();
+    doubleCase.link(this);
+    slowCases.append(branch32(Above, lateScratch, TrustedImm32(JSValue::LowestTag)));
+    moveIntsToDouble(earlyScratch, lateScratch, fpRegT0, fpRegT1);
+    ready.link(this);
+#endif
+    
+    // We would be loading this into base as in get_by_val, except that the slow
+    // path expects the base to be unclobbered.
+    loadPtr(Address(base, JSArrayBufferView::offsetOfVector()), lateScratch);
+    
+    switch (elementSize(type)) {
+    case 4:
+        convertDoubleToFloat(fpRegT0, fpRegT0);
+        storeFloat(fpRegT0, BaseIndex(lateScratch, property, TimesFour));
+        break;
+    case 8:
+        storeDouble(fpRegT0, BaseIndex(lateScratch, property, TimesEight));
+        break;
+    default:
+        CRASH();
+    }
+    
+    done.link(this);
+    
+    return slowCases;
+}
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)