diff -r 000000000000 -r 6474c204b198 js/src/jit/CodeGenerator.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit/CodeGenerator.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8458 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jit/CodeGenerator.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/DebugOnly.h"
+
+#include "jslibmath.h"
+#include "jsmath.h"
+#include "jsnum.h"
+#include "jsprf.h"
+
+#include "builtin/Eval.h"
+#include "builtin/TypedObject.h"
+#ifdef JSGC_GENERATIONAL
+# include "gc/Nursery.h"
+#endif
+#include "jit/IonCaches.h"
+#include "jit/IonLinker.h"
+#include "jit/IonOptimizationLevels.h"
+#include "jit/IonSpewer.h"
+#include "jit/MIRGenerator.h"
+#include "jit/MoveEmitter.h"
+#include "jit/ParallelFunctions.h"
+#include "jit/ParallelSafetyAnalysis.h"
+#include "jit/RangeAnalysis.h"
+#include "vm/ForkJoin.h"
+#include "vm/TraceLogging.h"
+
+#include "jsboolinlines.h"
+
+#include "jit/ExecutionMode-inl.h"
+#include "jit/shared/CodeGenerator-shared-inl.h"
+#include "vm/Interpreter-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+using mozilla::DebugOnly;
+using mozilla::FloatingPoint;
+using mozilla::Maybe;
+using mozilla::NegativeInfinity;
+using mozilla::PositiveInfinity;
+using JS::GenericNaN;
+
+namespace js {
+namespace jit {
+
+// This out-of-line cache is used to do a double dispatch including it-self and
+// the wrapped IonCache.
+class OutOfLineUpdateCache :
+  public OutOfLineCodeBase<CodeGenerator>,
+  public IonCacheVisitor
+{
+  private:
+    LInstruction *lir_;
+    size_t cacheIndex_;
+    AddCacheState state_;
+
+  public:
+    OutOfLineUpdateCache(LInstruction *lir, size_t cacheIndex)
+      : lir_(lir),
+        cacheIndex_(cacheIndex)
+    { }
+
+    void bind(MacroAssembler *masm) {
+        // The binding of the initial jump is done in
+        // CodeGenerator::visitOutOfLineCache.
+    }
+
+    size_t getCacheIndex() const {
+        return cacheIndex_;
+    }
+    LInstruction *lir() const {
+        return lir_;
+    }
+    AddCacheState &state() {
+        return state_;
+    }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineCache(this);
+    }
+
+    // ICs' visit functions delegating the work to the CodeGen visit funtions.
+#define VISIT_CACHE_FUNCTION(op)                                        \
+    bool visit##op##IC(CodeGenerator *codegen) {                        \
+        CodeGenerator::DataPtr<op##IC> ic(codegen, getCacheIndex());    \
+        return codegen->visit##op##IC(this, ic);                        \
+    }
+
+    IONCACHE_KIND_LIST(VISIT_CACHE_FUNCTION)
+#undef VISIT_CACHE_FUNCTION
+};
+
+// This function is declared here because it needs to instantiate an
+// OutOfLineUpdateCache, but we want to keep it visible inside the
+// CodeGeneratorShared such as we can specialize inline caches in function of
+// the architecture.
+bool
+CodeGeneratorShared::addCache(LInstruction *lir, size_t cacheIndex)
+{
+    if (cacheIndex == SIZE_MAX)
+        return false;
+
+    DataPtr<IonCache> cache(this, cacheIndex);
+    MInstruction *mir = lir->mirRaw()->toInstruction();
+    if (mir->resumePoint())
+        cache->setScriptedLocation(mir->block()->info().script(),
+                                   mir->resumePoint()->pc());
+    else
+        cache->setIdempotent();
+
+    OutOfLineUpdateCache *ool = new(alloc()) OutOfLineUpdateCache(lir, cacheIndex);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    // OOL-specific state depends on the type of cache.
+    cache->initializeAddCacheState(lir, &ool->state());
+
+    cache->emitInitialJump(masm, ool->state());
+    masm.bind(ool->rejoin());
+
+    return true;
+}
+
+bool
+CodeGenerator::visitOutOfLineCache(OutOfLineUpdateCache *ool)
+{
+    DataPtr<IonCache> cache(this, ool->getCacheIndex());
+
+    // Register the location of the OOL path in the IC.
+    cache->setFallbackLabel(masm.labelForPatch());
+    cache->bindInitialJump(masm, ool->state());
+
+    // Dispatch to ICs' accept functions.
+    return cache->accept(this, ool);
+}
+
+StringObject *
+MNewStringObject::templateObj() const {
+    return &templateObj_->as<StringObject>();
+}
+
+CodeGenerator::CodeGenerator(MIRGenerator *gen, LIRGraph *graph, MacroAssembler *masm)
+  : CodeGeneratorSpecific(gen, graph, masm)
+  , ionScriptLabels_(gen->alloc())
+{
+}
+
+CodeGenerator::~CodeGenerator()
+{
+    JS_ASSERT_IF(!gen->compilingAsmJS(), masm.numAsmJSAbsoluteLinks() == 0);
+}
+
+typedef bool (*StringToNumberFn)(ThreadSafeContext *, JSString *, double *);
+typedef bool (*StringToNumberParFn)(ForkJoinContext *, JSString *, double *);
+static const VMFunctionsModal StringToNumberInfo = VMFunctionsModal(
+    FunctionInfo<StringToNumberFn>(StringToNumber),
+    FunctionInfo<StringToNumberParFn>(StringToNumberPar));
+
+bool
+CodeGenerator::visitValueToInt32(LValueToInt32 *lir)
+{
+    ValueOperand operand = ToValue(lir, LValueToInt32::Input);
+    Register output = ToRegister(lir->output());
+    FloatRegister temp = ToFloatRegister(lir->tempFloat());
+
+    MDefinition *input;
+    if (lir->mode() == LValueToInt32::NORMAL)
+        input = lir->mirNormal()->input();
+    else
+        input = lir->mirTruncate()->input();
+
+    Label fails;
+    if (lir->mode() == LValueToInt32::TRUNCATE) {
+        OutOfLineCode *oolDouble = oolTruncateDouble(temp, output);
+        if (!oolDouble)
+            return false;
+
+        // We can only handle strings in truncation contexts, like bitwise
+        // operations.
+        Label *stringEntry, *stringRejoin;
+        Register stringReg;
+        if (input->mightBeType(MIRType_String)) {
+            stringReg = ToRegister(lir->temp());
+            OutOfLineCode *oolString = oolCallVM(StringToNumberInfo, lir, (ArgList(), stringReg),
+                                                 StoreFloatRegisterTo(temp));
+            if (!oolString)
+                return false;
+            stringEntry = oolString->entry();
+            stringRejoin = oolString->rejoin();
+        } else {
+            stringReg = InvalidReg;
+            stringEntry = nullptr;
+            stringRejoin = nullptr;
+        }
+
+        masm.truncateValueToInt32(operand, input, stringEntry, stringRejoin, oolDouble->entry(),
+                                  stringReg, temp, output, &fails);
+        masm.bind(oolDouble->rejoin());
+    } else {
+        masm.convertValueToInt32(operand, input, temp, output, &fails,
+                                 lir->mirNormal()->canBeNegativeZero(),
+                                 lir->mirNormal()->conversion());
+    }
+
+    return bailoutFrom(&fails, lir->snapshot());
+}
+
+bool
+CodeGenerator::visitValueToDouble(LValueToDouble *lir)
+{
+    MToDouble *mir = lir->mir();
+    ValueOperand operand = ToValue(lir, LValueToDouble::Input);
+    FloatRegister output = ToFloatRegister(lir->output());
+
+    Register tag = masm.splitTagForTest(operand);
+
+    Label isDouble, isInt32, isBool, isNull, isUndefined, done;
+    bool hasBoolean = false, hasNull = false, hasUndefined = false;
+
+    masm.branchTestDouble(Assembler::Equal, tag, &isDouble);
+    masm.branchTestInt32(Assembler::Equal, tag, &isInt32);
+
+    if (mir->conversion() != MToDouble::NumbersOnly) {
+        masm.branchTestBoolean(Assembler::Equal, tag, &isBool);
+        masm.branchTestUndefined(Assembler::Equal, tag, &isUndefined);
+        hasBoolean = true;
+        hasUndefined = true;
+        if (mir->conversion() != MToDouble::NonNullNonStringPrimitives) {
+            masm.branchTestNull(Assembler::Equal, tag, &isNull);
+            hasNull = true;
+        }
+    }
+
+    if (!bailout(lir->snapshot()))
+        return false;
+
+    if (hasNull) {
+        masm.bind(&isNull);
+        masm.loadConstantDouble(0.0, output);
+        masm.jump(&done);
+    }
+
+    if (hasUndefined) {
+        masm.bind(&isUndefined);
+        masm.loadConstantDouble(GenericNaN(), output);
+        masm.jump(&done);
+    }
+
+    if (hasBoolean) {
+        masm.bind(&isBool);
+        masm.boolValueToDouble(operand, output);
+        masm.jump(&done);
+    }
+
+    masm.bind(&isInt32);
+    masm.int32ValueToDouble(operand, output);
+    masm.jump(&done);
+
+    masm.bind(&isDouble);
+    masm.unboxDouble(operand, output);
+    masm.bind(&done);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitValueToFloat32(LValueToFloat32 *lir)
+{
+    MToFloat32 *mir = lir->mir();
+    ValueOperand operand = ToValue(lir, LValueToFloat32::Input);
+    FloatRegister output = ToFloatRegister(lir->output());
+
+    Register tag = masm.splitTagForTest(operand);
+
+    Label isDouble, isInt32, isBool, isNull, isUndefined, done;
+    bool hasBoolean = false, hasNull = false, hasUndefined = false;
+
+    masm.branchTestDouble(Assembler::Equal, tag, &isDouble);
+    masm.branchTestInt32(Assembler::Equal, tag, &isInt32);
+
+    if (mir->conversion() != MToFloat32::NumbersOnly) {
+        masm.branchTestBoolean(Assembler::Equal, tag, &isBool);
+        masm.branchTestUndefined(Assembler::Equal, tag, &isUndefined);
+        hasBoolean = true;
+        hasUndefined = true;
+        if (mir->conversion() != MToFloat32::NonNullNonStringPrimitives) {
+            masm.branchTestNull(Assembler::Equal, tag, &isNull);
+            hasNull = true;
+        }
+    }
+
+    if (!bailout(lir->snapshot()))
+        return false;
+
+    if (hasNull) {
+        masm.bind(&isNull);
+        masm.loadConstantFloat32(0.0f, output);
+        masm.jump(&done);
+    }
+
+    if (hasUndefined) {
+        masm.bind(&isUndefined);
+        masm.loadConstantFloat32(float(GenericNaN()), output);
+        masm.jump(&done);
+    }
+
+    if (hasBoolean) {
+        masm.bind(&isBool);
+        masm.boolValueToFloat32(operand, output);
+        masm.jump(&done);
+    }
+
+    masm.bind(&isInt32);
+    masm.int32ValueToFloat32(operand, output);
+    masm.jump(&done);
+
+    masm.bind(&isDouble);
+    masm.unboxDouble(operand, output);
+    masm.convertDoubleToFloat32(output, output);
+    masm.bind(&done);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitInt32ToDouble(LInt32ToDouble *lir)
+{
+    masm.convertInt32ToDouble(ToRegister(lir->input()), ToFloatRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitFloat32ToDouble(LFloat32ToDouble *lir)
+{
+    masm.convertFloat32ToDouble(ToFloatRegister(lir->input()), ToFloatRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitDoubleToFloat32(LDoubleToFloat32 *lir)
+{
+    masm.convertDoubleToFloat32(ToFloatRegister(lir->input()), ToFloatRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitInt32ToFloat32(LInt32ToFloat32 *lir)
+{
+    masm.convertInt32ToFloat32(ToRegister(lir->input()), ToFloatRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitDoubleToInt32(LDoubleToInt32 *lir)
+{
+    Label fail;
+    FloatRegister input = ToFloatRegister(lir->input());
+    Register output = ToRegister(lir->output());
+    masm.convertDoubleToInt32(input, output, &fail, lir->mir()->canBeNegativeZero());
+    if (!bailoutFrom(&fail, lir->snapshot()))
+        return false;
+    return true;
+}
+
+bool
+CodeGenerator::visitFloat32ToInt32(LFloat32ToInt32 *lir)
+{
+    Label fail;
+    FloatRegister input = ToFloatRegister(lir->input());
+    Register output = ToRegister(lir->output());
+    masm.convertFloat32ToInt32(input, output, &fail, lir->mir()->canBeNegativeZero());
+    if (!bailoutFrom(&fail, lir->snapshot()))
+        return false;
+    return true;
+}
+
+void
+CodeGenerator::emitOOLTestObject(Register objreg,
+                                 Label *ifEmulatesUndefined,
+                                 Label *ifDoesntEmulateUndefined,
+                                 Register scratch)
+{
+    saveVolatile(scratch);
+    masm.setupUnalignedABICall(1, scratch);
+    masm.passABIArg(objreg);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, js::EmulatesUndefined));
+    masm.storeCallResult(scratch);
+    restoreVolatile(scratch);
+
+    masm.branchIfTrueBool(scratch, ifEmulatesUndefined);
+    masm.jump(ifDoesntEmulateUndefined);
+}
+
+// Base out-of-line code generator for all tests of the truthiness of an
+// object, where the object might not be truthy.  (Recall that per spec all
+// objects are truthy, but we implement the JSCLASS_EMULATES_UNDEFINED class
+// flag to permit objects to look like |undefined| in certain contexts,
+// including in object truthiness testing.)  We check truthiness inline except
+// when we're testing it on a proxy (or if TI guarantees us that the specified
+// object will never emulate |undefined|), in which case out-of-line code will
+// call EmulatesUndefined for a conclusive answer.
+class OutOfLineTestObject : public OutOfLineCodeBase<CodeGenerator>
+{
+    Register objreg_;
+    Register scratch_;
+
+    Label *ifEmulatesUndefined_;
+    Label *ifDoesntEmulateUndefined_;
+
+#ifdef DEBUG
+    bool initialized() { return ifEmulatesUndefined_ != nullptr; }
+#endif
+
+  public:
+    OutOfLineTestObject()
+#ifdef DEBUG
+      : ifEmulatesUndefined_(nullptr), ifDoesntEmulateUndefined_(nullptr)
+#endif
+    { }
+
+    bool accept(CodeGenerator *codegen) MOZ_FINAL MOZ_OVERRIDE {
+        MOZ_ASSERT(initialized());
+        codegen->emitOOLTestObject(objreg_, ifEmulatesUndefined_, ifDoesntEmulateUndefined_,
+                                   scratch_);
+        return true;
+    }
+
+    // Specify the register where the object to be tested is found, labels to
+    // jump to if the object is truthy or falsy, and a scratch register for
+    // use in the out-of-line path.
+    void setInputAndTargets(Register objreg, Label *ifEmulatesUndefined, Label *ifDoesntEmulateUndefined,
+                            Register scratch)
+    {
+        MOZ_ASSERT(!initialized());
+        MOZ_ASSERT(ifEmulatesUndefined);
+        objreg_ = objreg;
+        scratch_ = scratch;
+        ifEmulatesUndefined_ = ifEmulatesUndefined;
+        ifDoesntEmulateUndefined_ = ifDoesntEmulateUndefined;
+    }
+};
+
+// A subclass of OutOfLineTestObject containing two extra labels, for use when
+// the ifTruthy/ifFalsy labels are needed in inline code as well as out-of-line
+// code.  The user should bind these labels in inline code, and specify them as
+// targets via setInputAndTargets, as appropriate.
+class OutOfLineTestObjectWithLabels : public OutOfLineTestObject
+{
+    Label label1_;
+    Label label2_;
+
+  public:
+    OutOfLineTestObjectWithLabels() { }
+
+    Label *label1() { return &label1_; }
+    Label *label2() { return &label2_; }
+};
+
+void
+CodeGenerator::testObjectEmulatesUndefinedKernel(Register objreg,
+                                                 Label *ifEmulatesUndefined,
+                                                 Label *ifDoesntEmulateUndefined,
+                                                 Register scratch, OutOfLineTestObject *ool)
+{
+    ool->setInputAndTargets(objreg, ifEmulatesUndefined, ifDoesntEmulateUndefined, scratch);
+
+    // Perform a fast-path check of the object's class flags if the object's
+    // not a proxy.  Let out-of-line code handle the slow cases that require
+    // saving registers, making a function call, and restoring registers.
+    masm.branchTestObjectTruthy(false, objreg, scratch, ool->entry(), ifEmulatesUndefined);
+}
+
+void
+CodeGenerator::branchTestObjectEmulatesUndefined(Register objreg,
+                                                 Label *ifEmulatesUndefined,
+                                                 Label *ifDoesntEmulateUndefined,
+                                                 Register scratch, OutOfLineTestObject *ool)
+{
+    MOZ_ASSERT(!ifDoesntEmulateUndefined->bound(),
+               "ifDoesntEmulateUndefined will be bound to the fallthrough path");
+
+    testObjectEmulatesUndefinedKernel(objreg, ifEmulatesUndefined, ifDoesntEmulateUndefined,
+                                      scratch, ool);
+    masm.bind(ifDoesntEmulateUndefined);
+}
+
+void
+CodeGenerator::testObjectEmulatesUndefined(Register objreg,
+                                           Label *ifEmulatesUndefined,
+                                           Label *ifDoesntEmulateUndefined,
+                                           Register scratch, OutOfLineTestObject *ool)
+{
+    testObjectEmulatesUndefinedKernel(objreg, ifEmulatesUndefined, ifDoesntEmulateUndefined,
+                                      scratch, ool);
+    masm.jump(ifDoesntEmulateUndefined);
+}
+
+void
+CodeGenerator::testValueTruthyKernel(const ValueOperand &value,
+                                     const LDefinition *scratch1, const LDefinition *scratch2,
+                                     FloatRegister fr,
+                                     Label *ifTruthy, Label *ifFalsy,
+                                     OutOfLineTestObject *ool)
+{
+    Register tag = masm.splitTagForTest(value);
+
+    // Eventually we will want some sort of type filter here. For now, just
+    // emit all easy cases. For speed we use the cached tag for all comparison,
+    // except for doubles, which we test last (as the operation can clobber the
+    // tag, which may be in ScratchReg).
+    masm.branchTestUndefined(Assembler::Equal, tag, ifFalsy);
+    masm.branchTestNull(Assembler::Equal, tag, ifFalsy);
+
+    Label notBoolean;
+    masm.branchTestBoolean(Assembler::NotEqual, tag, &notBoolean);
+    masm.branchTestBooleanTruthy(false, value, ifFalsy);
+    masm.jump(ifTruthy);
+    masm.bind(&notBoolean);
+
+    Label notInt32;
+    masm.branchTestInt32(Assembler::NotEqual, tag, &notInt32);
+    masm.branchTestInt32Truthy(false, value, ifFalsy);
+    masm.jump(ifTruthy);
+    masm.bind(&notInt32);
+
+    if (ool) {
+        Label notObject;
+
+        masm.branchTestObject(Assembler::NotEqual, tag, &notObject);
+
+        Register objreg = masm.extractObject(value, ToRegister(scratch1));
+        testObjectEmulatesUndefined(objreg, ifFalsy, ifTruthy, ToRegister(scratch2), ool);
+
+        masm.bind(&notObject);
+    } else {
+        masm.branchTestObject(Assembler::Equal, tag, ifTruthy);
+    }
+
+    // Test if a string is non-empty.
+    Label notString;
+    masm.branchTestString(Assembler::NotEqual, tag, &notString);
+    masm.branchTestStringTruthy(false, value, ifFalsy);
+    masm.jump(ifTruthy);
+    masm.bind(&notString);
+
+    // If we reach here the value is a double.
+    masm.unboxDouble(value, fr);
+    masm.branchTestDoubleTruthy(false, fr, ifFalsy);
+
+    // Fall through for truthy.
+}
+
+void
+CodeGenerator::testValueTruthy(const ValueOperand &value,
+                               const LDefinition *scratch1, const LDefinition *scratch2,
+                               FloatRegister fr,
+                               Label *ifTruthy, Label *ifFalsy,
+                               OutOfLineTestObject *ool)
+{
+    testValueTruthyKernel(value, scratch1, scratch2, fr, ifTruthy, ifFalsy, ool);
+    masm.jump(ifTruthy);
+}
+
+Label *
+CodeGenerator::getJumpLabelForBranch(MBasicBlock *block)
+{
+    if (!labelForBackedgeWithImplicitCheck(block))
+        return block->lir()->label();
+
+    // We need to use a patchable jump for this backedge, but want to treat
+    // this as a normal label target to simplify codegen. Efficiency isn't so
+    // important here as these tests are extremely unlikely to be used in loop
+    // backedges, so emit inline code for the patchable jump. Heap allocating
+    // the label allows it to be used by out of line blocks.
+    Label *res = GetIonContext()->temp->lifoAlloc()->new_<Label>();
+    Label after;
+    masm.jump(&after);
+    masm.bind(res);
+    jumpToBlock(block);
+    masm.bind(&after);
+    return res;
+}
+
+bool
+CodeGenerator::visitTestOAndBranch(LTestOAndBranch *lir)
+{
+    MOZ_ASSERT(lir->mir()->operandMightEmulateUndefined(),
+               "Objects which can't emulate undefined should have been constant-folded");
+
+    OutOfLineTestObject *ool = new(alloc()) OutOfLineTestObject();
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Label *truthy = getJumpLabelForBranch(lir->ifTruthy());
+    Label *falsy = getJumpLabelForBranch(lir->ifFalsy());
+
+    testObjectEmulatesUndefined(ToRegister(lir->input()), falsy, truthy,
+                                ToRegister(lir->temp()), ool);
+    return true;
+
+}
+
+bool
+CodeGenerator::visitTestVAndBranch(LTestVAndBranch *lir)
+{
+    OutOfLineTestObject *ool = nullptr;
+    if (lir->mir()->operandMightEmulateUndefined()) {
+        ool = new(alloc()) OutOfLineTestObject();
+        if (!addOutOfLineCode(ool))
+            return false;
+    }
+
+    Label *truthy = getJumpLabelForBranch(lir->ifTruthy());
+    Label *falsy = getJumpLabelForBranch(lir->ifFalsy());
+
+    testValueTruthy(ToValue(lir, LTestVAndBranch::Input),
+                    lir->temp1(), lir->temp2(),
+                    ToFloatRegister(lir->tempFloat()),
+                    truthy, falsy, ool);
+    return true;
+}
+
+bool
+CodeGenerator::visitFunctionDispatch(LFunctionDispatch *lir)
+{
+    MFunctionDispatch *mir = lir->mir();
+    Register input = ToRegister(lir->input());
+    Label *lastLabel;
+    size_t casesWithFallback;
+
+    // Determine if the last case is fallback or an ordinary case.
+    if (!mir->hasFallback()) {
+        JS_ASSERT(mir->numCases() > 0);
+        casesWithFallback = mir->numCases();
+        lastLabel = mir->getCaseBlock(mir->numCases() - 1)->lir()->label();
+    } else {
+        casesWithFallback = mir->numCases() + 1;
+        lastLabel = mir->getFallback()->lir()->label();
+    }
+
+    // Compare function pointers, except for the last case.
+    for (size_t i = 0; i < casesWithFallback - 1; i++) {
+        JS_ASSERT(i < mir->numCases());
+        JSFunction *func = mir->getCase(i);
+        LBlock *target = mir->getCaseBlock(i)->lir();
+        masm.branchPtr(Assembler::Equal, input, ImmGCPtr(func), target->label());
+    }
+
+    // Jump to the last case.
+    masm.jump(lastLabel);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitTypeObjectDispatch(LTypeObjectDispatch *lir)
+{
+    MTypeObjectDispatch *mir = lir->mir();
+    Register input = ToRegister(lir->input());
+    Register temp = ToRegister(lir->temp());
+
+    // Hold the incoming TypeObject.
+    masm.loadPtr(Address(input, JSObject::offsetOfType()), temp);
+
+    // Compare TypeObjects.
+    InlinePropertyTable *propTable = mir->propTable();
+    for (size_t i = 0; i < mir->numCases(); i++) {
+        JSFunction *func = mir->getCase(i);
+        LBlock *target = mir->getCaseBlock(i)->lir();
+
+        DebugOnly<bool> found = false;
+        for (size_t j = 0; j < propTable->numEntries(); j++) {
+            if (propTable->getFunction(j) != func)
+                continue;
+            types::TypeObject *typeObj = propTable->getTypeObject(j);
+            masm.branchPtr(Assembler::Equal, temp, ImmGCPtr(typeObj), target->label());
+            found = true;
+        }
+        JS_ASSERT(found);
+    }
+
+    // Unknown function: jump to fallback block.
+    LBlock *fallback = mir->getFallback()->lir();
+    masm.jump(fallback->label());
+    return true;
+}
+
+bool
+CodeGenerator::visitBooleanToString(LBooleanToString *lir)
+{
+    Register input = ToRegister(lir->input());
+    Register output = ToRegister(lir->output());
+    const JSAtomState &names = GetIonContext()->runtime->names();
+    Label true_, done;
+
+    masm.branchTest32(Assembler::NonZero, input, input, &true_);
+    masm.movePtr(ImmGCPtr(names.false_), output);
+    masm.jump(&done);
+
+    masm.bind(&true_);
+    masm.movePtr(ImmGCPtr(names.true_), output);
+
+    masm.bind(&done);
+
+    return true;
+}
+
+void
+CodeGenerator::emitIntToString(Register input, Register output, Label *ool)
+{
+    masm.branch32(Assembler::AboveOrEqual, input, Imm32(StaticStrings::INT_STATIC_LIMIT), ool);
+
+    // Fast path for small integers.
+    masm.movePtr(ImmPtr(&GetIonContext()->runtime->staticStrings().intStaticTable), output);
+    masm.loadPtr(BaseIndex(output, input, ScalePointer), output);
+}
+
+typedef JSFlatString *(*IntToStringFn)(ThreadSafeContext *, int);
+typedef JSFlatString *(*IntToStringParFn)(ForkJoinContext *, int);
+static const VMFunctionsModal IntToStringInfo = VMFunctionsModal(
+    FunctionInfo<IntToStringFn>(Int32ToString<CanGC>),
+    FunctionInfo<IntToStringParFn>(IntToStringPar));
+
+bool
+CodeGenerator::visitIntToString(LIntToString *lir)
+{
+    Register input = ToRegister(lir->input());
+    Register output = ToRegister(lir->output());
+
+    OutOfLineCode *ool = oolCallVM(IntToStringInfo, lir, (ArgList(), input),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    emitIntToString(input, output, ool->entry());
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSString *(*DoubleToStringFn)(ThreadSafeContext *, double);
+typedef JSString *(*DoubleToStringParFn)(ForkJoinContext *, double);
+static const VMFunctionsModal DoubleToStringInfo = VMFunctionsModal(
+    FunctionInfo<DoubleToStringFn>(NumberToString<CanGC>),
+    FunctionInfo<DoubleToStringParFn>(DoubleToStringPar));
+
+bool
+CodeGenerator::visitDoubleToString(LDoubleToString *lir)
+{
+    FloatRegister input = ToFloatRegister(lir->input());
+    Register temp = ToRegister(lir->tempInt());
+    Register output = ToRegister(lir->output());
+
+    OutOfLineCode *ool = oolCallVM(DoubleToStringInfo, lir, (ArgList(), input),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    // Try double to integer conversion and run integer to string code.
+    masm.convertDoubleToInt32(input, temp, ool->entry(), true);
+    emitIntToString(temp, output, ool->entry());
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSString *(*PrimitiveToStringFn)(JSContext *, HandleValue);
+typedef JSString *(*PrimitiveToStringParFn)(ForkJoinContext *, HandleValue);
+static const VMFunctionsModal PrimitiveToStringInfo = VMFunctionsModal(
+    FunctionInfo<PrimitiveToStringFn>(ToStringSlow),
+    FunctionInfo<PrimitiveToStringParFn>(PrimitiveToStringPar));
+
+bool
+CodeGenerator::visitPrimitiveToString(LPrimitiveToString *lir)
+{
+    ValueOperand input = ToValue(lir, LPrimitiveToString::Input);
+    Register output = ToRegister(lir->output());
+
+    OutOfLineCode *ool = oolCallVM(PrimitiveToStringInfo, lir, (ArgList(), input),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    Label done;
+    Register tag = masm.splitTagForTest(input);
+    const JSAtomState &names = GetIonContext()->runtime->names();
+
+    // String
+    if (lir->mir()->input()->mightBeType(MIRType_String)) {
+        Label notString;
+        masm.branchTestString(Assembler::NotEqual, tag, &notString);
+        masm.unboxString(input, output);
+        masm.jump(&done);
+        masm.bind(&notString);
+    }
+
+    // Integer
+    if (lir->mir()->input()->mightBeType(MIRType_Int32)) {
+        Label notInteger;
+        masm.branchTestInt32(Assembler::NotEqual, tag, &notInteger);
+        Register unboxed = ToTempUnboxRegister(lir->tempToUnbox());
+        unboxed = masm.extractInt32(input, unboxed);
+        emitIntToString(unboxed, output, ool->entry());
+        masm.jump(&done);
+        masm.bind(&notInteger);
+    }
+
+    // Double
+    if (lir->mir()->input()->mightBeType(MIRType_Double)) {
+        // Note: no fastpath. Need two extra registers and can only convert doubles
+        // that fit integers and are smaller than StaticStrings::INT_STATIC_LIMIT.
+        masm.branchTestDouble(Assembler::Equal, tag, ool->entry());
+    }
+
+    // Undefined
+    if (lir->mir()->input()->mightBeType(MIRType_Undefined)) {
+        Label notUndefined;
+        masm.branchTestUndefined(Assembler::NotEqual, tag, &notUndefined);
+        masm.movePtr(ImmGCPtr(names.undefined), output);
+        masm.jump(&done);
+        masm.bind(&notUndefined);
+    }
+
+    // Null
+    if (lir->mir()->input()->mightBeType(MIRType_Null)) {
+        Label notNull;
+        masm.branchTestNull(Assembler::NotEqual, tag, &notNull);
+        masm.movePtr(ImmGCPtr(names.null), output);
+        masm.jump(&done);
+        masm.bind(&notNull);
+    }
+
+    // Boolean
+    if (lir->mir()->input()->mightBeType(MIRType_Boolean)) {
+        Label notBoolean, true_;
+        masm.branchTestBoolean(Assembler::NotEqual, tag, &notBoolean);
+        masm.branchTestBooleanTruthy(true, input, &true_);
+        masm.movePtr(ImmGCPtr(names.false_), output);
+        masm.jump(&done);
+        masm.bind(&true_);
+        masm.movePtr(ImmGCPtr(names.true_), output);
+        masm.jump(&done);
+        masm.bind(&notBoolean);
+    }
+
+#ifdef DEBUG
+    // Objects are not supported or we see a type that wasn't accounted for.
+    masm.assumeUnreachable("Unexpected type for MPrimitiveToString.");
+#endif
+
+    masm.bind(&done);
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSObject *(*CloneRegExpObjectFn)(JSContext *, JSObject *);
+static const VMFunction CloneRegExpObjectInfo =
+    FunctionInfo<CloneRegExpObjectFn>(CloneRegExpObject);
+
+bool
+CodeGenerator::visitRegExp(LRegExp *lir)
+{
+    pushArg(ImmGCPtr(lir->mir()->source()));
+    return callVM(CloneRegExpObjectInfo, lir);
+}
+
+typedef bool (*RegExpExecRawFn)(JSContext *cx, HandleObject regexp,
+                                HandleString input, MutableHandleValue output);
+static const VMFunction RegExpExecRawInfo = FunctionInfo<RegExpExecRawFn>(regexp_exec_raw);
+
+bool
+CodeGenerator::visitRegExpExec(LRegExpExec *lir)
+{
+    pushArg(ToRegister(lir->string()));
+    pushArg(ToRegister(lir->regexp()));
+    return callVM(RegExpExecRawInfo, lir);
+}
+
+typedef bool (*RegExpTestRawFn)(JSContext *cx, HandleObject regexp,
+                                HandleString input, bool *result);
+static const VMFunction RegExpTestRawInfo = FunctionInfo<RegExpTestRawFn>(regexp_test_raw);
+
+bool
+CodeGenerator::visitRegExpTest(LRegExpTest *lir)
+{
+    pushArg(ToRegister(lir->string()));
+    pushArg(ToRegister(lir->regexp()));
+    return callVM(RegExpTestRawInfo, lir);
+}
+
+typedef JSString *(*RegExpReplaceFn)(JSContext *, HandleString, HandleObject, HandleString);
+static const VMFunction RegExpReplaceInfo = FunctionInfo<RegExpReplaceFn>(RegExpReplace);
+
+bool
+CodeGenerator::visitRegExpReplace(LRegExpReplace *lir)
+{
+    if (lir->replacement()->isConstant())
+        pushArg(ImmGCPtr(lir->replacement()->toConstant()->toString()));
+    else
+        pushArg(ToRegister(lir->replacement()));
+
+    pushArg(ToRegister(lir->pattern()));
+
+    if (lir->string()->isConstant())
+        pushArg(ImmGCPtr(lir->string()->toConstant()->toString()));
+    else
+        pushArg(ToRegister(lir->string()));
+
+    return callVM(RegExpReplaceInfo, lir);
+}
+
+typedef JSString *(*StringReplaceFn)(JSContext *, HandleString, HandleString, HandleString);
+static const VMFunction StringReplaceInfo = FunctionInfo<StringReplaceFn>(StringReplace);
+
+bool
+CodeGenerator::visitStringReplace(LStringReplace *lir)
+{
+    if (lir->replacement()->isConstant())
+        pushArg(ImmGCPtr(lir->replacement()->toConstant()->toString()));
+    else
+        pushArg(ToRegister(lir->replacement()));
+
+    if (lir->pattern()->isConstant())
+        pushArg(ImmGCPtr(lir->pattern()->toConstant()->toString()));
+    else
+        pushArg(ToRegister(lir->pattern()));
+
+    if (lir->string()->isConstant())
+        pushArg(ImmGCPtr(lir->string()->toConstant()->toString()));
+    else
+        pushArg(ToRegister(lir->string()));
+
+    return callVM(StringReplaceInfo, lir);
+}
+
+
+typedef JSObject *(*LambdaFn)(JSContext *, HandleFunction, HandleObject);
+static const VMFunction LambdaInfo = FunctionInfo<LambdaFn>(js::Lambda);
+
+bool
+CodeGenerator::visitLambdaForSingleton(LLambdaForSingleton *lir)
+{
+    pushArg(ToRegister(lir->scopeChain()));
+    pushArg(ImmGCPtr(lir->mir()->info().fun));
+    return callVM(LambdaInfo, lir);
+}
+
+bool
+CodeGenerator::visitLambda(LLambda *lir)
+{
+    Register scopeChain = ToRegister(lir->scopeChain());
+    Register output = ToRegister(lir->output());
+    Register tempReg = ToRegister(lir->temp());
+    const LambdaFunctionInfo &info = lir->mir()->info();
+
+    OutOfLineCode *ool = oolCallVM(LambdaInfo, lir, (ArgList(), ImmGCPtr(info.fun), scopeChain),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    JS_ASSERT(!info.singletonType);
+
+    masm.newGCThing(output, tempReg, info.fun, ool->entry(), gc::DefaultHeap);
+    masm.initGCThing(output, tempReg, info.fun);
+
+    emitLambdaInit(output, scopeChain, info);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSObject *(*LambdaArrowFn)(JSContext *, HandleFunction, HandleObject, HandleValue);
+static const VMFunction LambdaArrowInfo = FunctionInfo<LambdaArrowFn>(js::LambdaArrow);
+
+bool
+CodeGenerator::visitLambdaArrow(LLambdaArrow *lir)
+{
+    Register scopeChain = ToRegister(lir->scopeChain());
+    ValueOperand thisv = ToValue(lir, LLambdaArrow::ThisValue);
+    Register output = ToRegister(lir->output());
+    Register tempReg = ToRegister(lir->temp());
+    const LambdaFunctionInfo &info = lir->mir()->info();
+
+    OutOfLineCode *ool = oolCallVM(LambdaArrowInfo, lir,
+                                   (ArgList(), ImmGCPtr(info.fun), scopeChain, thisv),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    MOZ_ASSERT(!info.useNewTypeForClone);
+
+    if (info.singletonType) {
+        // If the function has a singleton type, this instruction will only be
+        // executed once so we don't bother inlining it.
+        masm.jump(ool->entry());
+        masm.bind(ool->rejoin());
+        return true;
+    }
+
+    masm.newGCThing(output, tempReg, info.fun, ool->entry(), gc::DefaultHeap);
+    masm.initGCThing(output, tempReg, info.fun);
+
+    emitLambdaInit(output, scopeChain, info);
+
+    // Initialize extended slots. Lexical |this| is stored in the first one.
+    MOZ_ASSERT(info.flags & JSFunction::EXTENDED);
+    static_assert(FunctionExtended::NUM_EXTENDED_SLOTS == 2, "All slots must be initialized");
+    static_assert(FunctionExtended::ARROW_THIS_SLOT == 0, "|this| must be stored in first slot");
+    masm.storeValue(thisv, Address(output, FunctionExtended::offsetOfExtendedSlot(0)));
+    masm.storeValue(UndefinedValue(), Address(output, FunctionExtended::offsetOfExtendedSlot(1)));
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+void
+CodeGenerator::emitLambdaInit(Register output, Register scopeChain,
+                              const LambdaFunctionInfo &info)
+{
+    MOZ_ASSERT(!!(info.flags & JSFunction::ARROW) == !!(info.flags & JSFunction::EXTENDED));
+
+    // Initialize nargs and flags. We do this with a single uint32 to avoid
+    // 16-bit writes.
+    union {
+        struct S {
+            uint16_t nargs;
+            uint16_t flags;
+        } s;
+        uint32_t word;
+    } u;
+    u.s.nargs = info.fun->nargs();
+    u.s.flags = info.flags;
+
+    JS_ASSERT(JSFunction::offsetOfFlags() == JSFunction::offsetOfNargs() + 2);
+    masm.store32(Imm32(u.word), Address(output, JSFunction::offsetOfNargs()));
+    masm.storePtr(ImmGCPtr(info.scriptOrLazyScript),
+                  Address(output, JSFunction::offsetOfNativeOrScript()));
+    masm.storePtr(scopeChain, Address(output, JSFunction::offsetOfEnvironment()));
+    masm.storePtr(ImmGCPtr(info.fun->displayAtom()), Address(output, JSFunction::offsetOfAtom()));
+}
+
+bool
+CodeGenerator::visitLambdaPar(LLambdaPar *lir)
+{
+    Register resultReg = ToRegister(lir->output());
+    Register cxReg = ToRegister(lir->forkJoinContext());
+    Register scopeChainReg = ToRegister(lir->scopeChain());
+    Register tempReg1 = ToRegister(lir->getTemp0());
+    Register tempReg2 = ToRegister(lir->getTemp1());
+    const LambdaFunctionInfo &info = lir->mir()->info();
+
+    JS_ASSERT(scopeChainReg != resultReg);
+
+    emitAllocateGCThingPar(lir, resultReg, cxReg, tempReg1, tempReg2, info.fun);
+    emitLambdaInit(resultReg, scopeChainReg, info);
+    return true;
+}
+
+bool
+CodeGenerator::visitLabel(LLabel *lir)
+{
+    return true;
+}
+
+bool
+CodeGenerator::visitNop(LNop *lir)
+{
+    return true;
+}
+
+bool
+CodeGenerator::visitOsiPoint(LOsiPoint *lir)
+{
+    // Note: markOsiPoint ensures enough space exists between the last
+    // LOsiPoint and this one to patch adjacent call instructions.
+
+    JS_ASSERT(masm.framePushed() == frameSize());
+
+    uint32_t osiCallPointOffset;
+    if (!markOsiPoint(lir, &osiCallPointOffset))
+        return false;
+
+    LSafepoint *safepoint = lir->associatedSafepoint();
+    JS_ASSERT(!safepoint->osiCallPointOffset());
+    safepoint->setOsiCallPointOffset(osiCallPointOffset);
+
+#ifdef DEBUG
+    // There should be no movegroups or other instructions between
+    // an instruction and its OsiPoint. This is necessary because
+    // we use the OsiPoint's snapshot from within VM calls.
+    for (LInstructionReverseIterator iter(current->rbegin(lir)); iter != current->rend(); iter++) {
+        if (*iter == lir || iter->isNop())
+            continue;
+        JS_ASSERT(!iter->isMoveGroup());
+        JS_ASSERT(iter->safepoint() == safepoint);
+        break;
+    }
+#endif
+
+#ifdef CHECK_OSIPOINT_REGISTERS
+    if (shouldVerifyOsiPointRegs(safepoint))
+        verifyOsiPointRegs(safepoint);
+#endif
+
+    return true;
+}
+
+bool
+CodeGenerator::visitGoto(LGoto *lir)
+{
+    jumpToBlock(lir->target());
+    return true;
+}
+
+// Out-of-line path to execute any move groups between the start of a loop
+// header and its interrupt check, then invoke the interrupt handler.
+class OutOfLineInterruptCheckImplicit : public OutOfLineCodeBase<CodeGenerator>
+{
+  public:
+    LBlock *block;
+    LInterruptCheckImplicit *lir;
+
+    OutOfLineInterruptCheckImplicit(LBlock *block, LInterruptCheckImplicit *lir)
+      : block(block), lir(lir)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineInterruptCheckImplicit(this);
+    }
+};
+
+bool
+CodeGenerator::visitOutOfLineInterruptCheckImplicit(OutOfLineInterruptCheckImplicit *ool)
+{
+#ifdef CHECK_OSIPOINT_REGISTERS
+    // This is path is entered from the patched back-edge of the loop. This
+    // means that the JitAtivation flags used for checking the validity of the
+    // OSI points are not reseted by the path generated by generateBody, so we
+    // have to reset it here.
+    resetOsiPointRegs(ool->lir->safepoint());
+#endif
+
+    LInstructionIterator iter = ool->block->begin();
+    for (; iter != ool->block->end(); iter++) {
+        if (iter->isLabel()) {
+            // Nothing to do.
+        } else if (iter->isMoveGroup()) {
+            // Replay this move group that preceds the interrupt check at the
+            // start of the loop header. Any incoming jumps here will be from
+            // the backedge and will skip over the move group emitted inline.
+            visitMoveGroup(iter->toMoveGroup());
+        } else {
+            break;
+        }
+    }
+    JS_ASSERT(*iter == ool->lir);
+
+    saveLive(ool->lir);
+    if (!callVM(InterruptCheckInfo, ool->lir))
+        return false;
+    restoreLive(ool->lir);
+    masm.jump(ool->rejoin());
+
+    return true;
+}
+
+bool
+CodeGenerator::visitInterruptCheckImplicit(LInterruptCheckImplicit *lir)
+{
+    OutOfLineInterruptCheckImplicit *ool = new(alloc()) OutOfLineInterruptCheckImplicit(current, lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    lir->setOolEntry(ool->entry());
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitTableSwitch(LTableSwitch *ins)
+{
+    MTableSwitch *mir = ins->mir();
+    Label *defaultcase = mir->getDefault()->lir()->label();
+    const LAllocation *temp;
+
+    if (mir->getOperand(0)->type() != MIRType_Int32) {
+        temp = ins->tempInt()->output();
+
+        // The input is a double, so try and convert it to an integer.
+        // If it does not fit in an integer, take the default case.
+        masm.convertDoubleToInt32(ToFloatRegister(ins->index()), ToRegister(temp), defaultcase, false);
+    } else {
+        temp = ins->index();
+    }
+
+    return emitTableSwitchDispatch(mir, ToRegister(temp), ToRegisterOrInvalid(ins->tempPointer()));
+}
+
+bool
+CodeGenerator::visitTableSwitchV(LTableSwitchV *ins)
+{
+    MTableSwitch *mir = ins->mir();
+    Label *defaultcase = mir->getDefault()->lir()->label();
+
+    Register index = ToRegister(ins->tempInt());
+    ValueOperand value = ToValue(ins, LTableSwitchV::InputValue);
+    Register tag = masm.extractTag(value, index);
+    masm.branchTestNumber(Assembler::NotEqual, tag, defaultcase);
+
+    Label unboxInt, isInt;
+    masm.branchTestInt32(Assembler::Equal, tag, &unboxInt);
+    {
+        FloatRegister floatIndex = ToFloatRegister(ins->tempFloat());
+        masm.unboxDouble(value, floatIndex);
+        masm.convertDoubleToInt32(floatIndex, index, defaultcase, false);
+        masm.jump(&isInt);
+    }
+
+    masm.bind(&unboxInt);
+    masm.unboxInt32(value, index);
+
+    masm.bind(&isInt);
+
+    return emitTableSwitchDispatch(mir, index, ToRegisterOrInvalid(ins->tempPointer()));
+}
+
+typedef JSObject *(*DeepCloneObjectLiteralFn)(JSContext *, HandleObject, NewObjectKind);
+static const VMFunction DeepCloneObjectLiteralInfo =
+    FunctionInfo<DeepCloneObjectLiteralFn>(DeepCloneObjectLiteral);
+
+bool
+CodeGenerator::visitCloneLiteral(LCloneLiteral *lir)
+{
+    pushArg(ImmWord(js::MaybeSingletonObject));
+    pushArg(ToRegister(lir->output()));
+    return callVM(DeepCloneObjectLiteralInfo, lir);
+}
+
+bool
+CodeGenerator::visitParameter(LParameter *lir)
+{
+    return true;
+}
+
+bool
+CodeGenerator::visitCallee(LCallee *lir)
+{
+    // read number of actual arguments from the JS frame.
+    Register callee = ToRegister(lir->output());
+    Address ptr(StackPointer, frameSize() + IonJSFrameLayout::offsetOfCalleeToken());
+
+    masm.loadPtr(ptr, callee);
+    return true;
+}
+
+bool
+CodeGenerator::visitStart(LStart *lir)
+{
+    return true;
+}
+
+bool
+CodeGenerator::visitReturn(LReturn *lir)
+{
+#if defined(JS_NUNBOX32)
+    DebugOnly<LAllocation *> type    = lir->getOperand(TYPE_INDEX);
+    DebugOnly<LAllocation *> payload = lir->getOperand(PAYLOAD_INDEX);
+    JS_ASSERT(ToRegister(type)    == JSReturnReg_Type);
+    JS_ASSERT(ToRegister(payload) == JSReturnReg_Data);
+#elif defined(JS_PUNBOX64)
+    DebugOnly<LAllocation *> result = lir->getOperand(0);
+    JS_ASSERT(ToRegister(result) == JSReturnReg);
+#endif
+    // Don't emit a jump to the return label if this is the last block.
+    if (current->mir() != *gen->graph().poBegin())
+        masm.jump(&returnLabel_);
+    return true;
+}
+
+bool
+CodeGenerator::visitOsrEntry(LOsrEntry *lir)
+{
+    // Remember the OSR entry offset into the code buffer.
+    masm.flushBuffer();
+    setOsrEntryOffset(masm.size());
+
+#ifdef JS_TRACE_LOGGING
+    if (gen->info().executionMode() == SequentialExecution) {
+        if (!emitTracelogStopEvent(TraceLogger::Baseline))
+            return false;
+        if (!emitTracelogStartEvent(TraceLogger::IonMonkey))
+            return false;
+    }
+#endif
+
+    // Allocate the full frame for this function.
+    uint32_t size = frameSize();
+    if (size != 0)
+        masm.subPtr(Imm32(size), StackPointer);
+    return true;
+}
+
+bool
+CodeGenerator::visitOsrScopeChain(LOsrScopeChain *lir)
+{
+    const LAllocation *frame   = lir->getOperand(0);
+    const LDefinition *object  = lir->getDef(0);
+
+    const ptrdiff_t frameOffset = BaselineFrame::reverseOffsetOfScopeChain();
+
+    masm.loadPtr(Address(ToRegister(frame), frameOffset), ToRegister(object));
+    return true;
+}
+
+bool
+CodeGenerator::visitOsrArgumentsObject(LOsrArgumentsObject *lir)
+{
+    const LAllocation *frame   = lir->getOperand(0);
+    const LDefinition *object  = lir->getDef(0);
+
+    const ptrdiff_t frameOffset = BaselineFrame::reverseOffsetOfArgsObj();
+
+    masm.loadPtr(Address(ToRegister(frame), frameOffset), ToRegister(object));
+    return true;
+}
+
+bool
+CodeGenerator::visitOsrValue(LOsrValue *value)
+{
+    const LAllocation *frame   = value->getOperand(0);
+    const ValueOperand out     = ToOutValue(value);
+
+    const ptrdiff_t frameOffset = value->mir()->frameOffset();
+
+    masm.loadValue(Address(ToRegister(frame), frameOffset), out);
+    return true;
+}
+
+bool
+CodeGenerator::visitOsrReturnValue(LOsrReturnValue *lir)
+{
+    const LAllocation *frame   = lir->getOperand(0);
+    const ValueOperand out     = ToOutValue(lir);
+
+    Address flags = Address(ToRegister(frame), BaselineFrame::reverseOffsetOfFlags());
+    Address retval = Address(ToRegister(frame), BaselineFrame::reverseOffsetOfReturnValue());
+
+    masm.moveValue(UndefinedValue(), out);
+
+    Label done;
+    masm.branchTest32(Assembler::Zero, flags, Imm32(BaselineFrame::HAS_RVAL), &done);
+    masm.loadValue(retval, out);
+    masm.bind(&done);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitStackArgT(LStackArgT *lir)
+{
+    const LAllocation *arg = lir->getArgument();
+    MIRType argType = lir->type();
+    uint32_t argslot = lir->argslot();
+    JS_ASSERT(argslot - 1u < graph.argumentSlotCount());
+
+    int32_t stack_offset = StackOffsetOfPassedArg(argslot);
+    Address dest(StackPointer, stack_offset);
+
+    if (arg->isFloatReg())
+        masm.storeDouble(ToFloatRegister(arg), dest);
+    else if (arg->isRegister())
+        masm.storeValue(ValueTypeFromMIRType(argType), ToRegister(arg), dest);
+    else
+        masm.storeValue(*(arg->toConstant()), dest);
+
+    uint32_t slot = StackOffsetToSlot(stack_offset);
+    JS_ASSERT(slot - 1u < graph.totalSlotCount());
+    return pushedArgumentSlots_.append(slot);
+}
+
+bool
+CodeGenerator::visitStackArgV(LStackArgV *lir)
+{
+    ValueOperand val = ToValue(lir, 0);
+    uint32_t argslot = lir->argslot();
+    JS_ASSERT(argslot - 1u < graph.argumentSlotCount());
+
+    int32_t stack_offset = StackOffsetOfPassedArg(argslot);
+
+    masm.storeValue(val, Address(StackPointer, stack_offset));
+
+    uint32_t slot = StackOffsetToSlot(stack_offset);
+    JS_ASSERT(slot - 1u < graph.totalSlotCount());
+    return pushedArgumentSlots_.append(slot);
+}
+
+bool
+CodeGenerator::visitMoveGroup(LMoveGroup *group)
+{
+    if (!group->numMoves())
+        return true;
+
+    MoveResolver &resolver = masm.moveResolver();
+
+    for (size_t i = 0; i < group->numMoves(); i++) {
+        const LMove &move = group->getMove(i);
+
+        const LAllocation *from = move.from();
+        const LAllocation *to = move.to();
+        LDefinition::Type type = move.type();
+
+        // No bogus moves.
+        JS_ASSERT(*from != *to);
+        JS_ASSERT(!from->isConstant());
+
+        MoveOp::Type moveType;
+        switch (type) {
+          case LDefinition::OBJECT:
+          case LDefinition::SLOTS:
+#ifdef JS_NUNBOX32
+          case LDefinition::TYPE:
+          case LDefinition::PAYLOAD:
+#else
+          case LDefinition::BOX:
+#endif
+          case LDefinition::GENERAL: moveType = MoveOp::GENERAL; break;
+          case LDefinition::INT32:   moveType = MoveOp::INT32;   break;
+          case LDefinition::FLOAT32: moveType = MoveOp::FLOAT32; break;
+          case LDefinition::DOUBLE:  moveType = MoveOp::DOUBLE;  break;
+          default: MOZ_ASSUME_UNREACHABLE("Unexpected move type");
+        }
+
+        if (!resolver.addMove(toMoveOperand(from), toMoveOperand(to), moveType))
+            return false;
+    }
+
+    if (!resolver.resolve())
+        return false;
+
+    MoveEmitter emitter(masm);
+    emitter.emit(resolver);
+    emitter.finish();
+
+    return true;
+}
+
+bool
+CodeGenerator::visitInteger(LInteger *lir)
+{
+    masm.move32(Imm32(lir->getValue()), ToRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitPointer(LPointer *lir)
+{
+    if (lir->kind() == LPointer::GC_THING)
+        masm.movePtr(ImmGCPtr(lir->gcptr()), ToRegister(lir->output()));
+    else
+        masm.movePtr(ImmPtr(lir->ptr()), ToRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitSlots(LSlots *lir)
+{
+    Address slots(ToRegister(lir->object()), JSObject::offsetOfSlots());
+    masm.loadPtr(slots, ToRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitStoreSlotV(LStoreSlotV *store)
+{
+    Register base = ToRegister(store->slots());
+    int32_t offset = store->mir()->slot() * sizeof(Value);
+
+    const ValueOperand value = ToValue(store, LStoreSlotV::Value);
+
+    if (store->mir()->needsBarrier())
+       emitPreBarrier(Address(base, offset), MIRType_Value);
+
+    masm.storeValue(value, Address(base, offset));
+    return true;
+}
+
+bool
+CodeGenerator::emitGetPropertyPolymorphic(LInstruction *ins, Register obj, Register scratch,
+                                          const TypedOrValueRegister &output)
+{
+    MGetPropertyPolymorphic *mir = ins->mirRaw()->toGetPropertyPolymorphic();
+    JS_ASSERT(mir->numShapes() > 1);
+
+    masm.loadObjShape(obj, scratch);
+
+    Label done;
+    for (size_t i = 0; i < mir->numShapes(); i++) {
+        Label next;
+        masm.branchPtr(Assembler::NotEqual, scratch, ImmGCPtr(mir->objShape(i)), &next);
+
+        Shape *shape = mir->shape(i);
+        if (shape->slot() < shape->numFixedSlots()) {
+            // Fixed slot.
+            masm.loadTypedOrValue(Address(obj, JSObject::getFixedSlotOffset(shape->slot())),
+                                  output);
+        } else {
+            // Dynamic slot.
+            uint32_t offset = (shape->slot() - shape->numFixedSlots()) * sizeof(js::Value);
+            masm.loadPtr(Address(obj, JSObject::offsetOfSlots()), scratch);
+            masm.loadTypedOrValue(Address(scratch, offset), output);
+        }
+
+        masm.jump(&done);
+        masm.bind(&next);
+    }
+
+    // Bailout if no shape matches.
+    if (!bailout(ins->snapshot()))
+        return false;
+
+    masm.bind(&done);
+    return true;
+}
+
+bool
+CodeGenerator::visitGetPropertyPolymorphicV(LGetPropertyPolymorphicV *ins)
+{
+    Register obj = ToRegister(ins->obj());
+    ValueOperand output = GetValueOutput(ins);
+    return emitGetPropertyPolymorphic(ins, obj, output.scratchReg(), output);
+}
+
+bool
+CodeGenerator::visitGetPropertyPolymorphicT(LGetPropertyPolymorphicT *ins)
+{
+    Register obj = ToRegister(ins->obj());
+    TypedOrValueRegister output(ins->mir()->type(), ToAnyRegister(ins->output()));
+    Register temp = (output.type() == MIRType_Double)
+                    ? ToRegister(ins->temp())
+                    : output.typedReg().gpr();
+    return emitGetPropertyPolymorphic(ins, obj, temp, output);
+}
+
+bool
+CodeGenerator::emitSetPropertyPolymorphic(LInstruction *ins, Register obj, Register scratch,
+                                          const ConstantOrRegister &value)
+{
+    MSetPropertyPolymorphic *mir = ins->mirRaw()->toSetPropertyPolymorphic();
+    JS_ASSERT(mir->numShapes() > 1);
+
+    masm.loadObjShape(obj, scratch);
+
+    Label done;
+    for (size_t i = 0; i < mir->numShapes(); i++) {
+        Label next;
+        masm.branchPtr(Assembler::NotEqual, scratch, ImmGCPtr(mir->objShape(i)), &next);
+
+        Shape *shape = mir->shape(i);
+        if (shape->slot() < shape->numFixedSlots()) {
+            // Fixed slot.
+            Address addr(obj, JSObject::getFixedSlotOffset(shape->slot()));
+            if (mir->needsBarrier())
+                emitPreBarrier(addr, MIRType_Value);
+            masm.storeConstantOrRegister(value, addr);
+        } else {
+            // Dynamic slot.
+            masm.loadPtr(Address(obj, JSObject::offsetOfSlots()), scratch);
+            Address addr(scratch, (shape->slot() - shape->numFixedSlots()) * sizeof(js::Value));
+            if (mir->needsBarrier())
+                emitPreBarrier(addr, MIRType_Value);
+            masm.storeConstantOrRegister(value, addr);
+        }
+
+        masm.jump(&done);
+        masm.bind(&next);
+    }
+
+    // Bailout if no shape matches.
+    if (!bailout(ins->snapshot()))
+        return false;
+
+    masm.bind(&done);
+    return true;
+}
+
+bool
+CodeGenerator::visitSetPropertyPolymorphicV(LSetPropertyPolymorphicV *ins)
+{
+    Register obj = ToRegister(ins->obj());
+    Register temp = ToRegister(ins->temp());
+    ValueOperand value = ToValue(ins, LSetPropertyPolymorphicV::Value);
+    return emitSetPropertyPolymorphic(ins, obj, temp, TypedOrValueRegister(value));
+}
+
+bool
+CodeGenerator::visitSetPropertyPolymorphicT(LSetPropertyPolymorphicT *ins)
+{
+    Register obj = ToRegister(ins->obj());
+    Register temp = ToRegister(ins->temp());
+
+    ConstantOrRegister value;
+    if (ins->mir()->value()->isConstant())
+        value = ConstantOrRegister(ins->mir()->value()->toConstant()->value());
+    else
+        value = TypedOrValueRegister(ins->mir()->value()->type(), ToAnyRegister(ins->value()));
+
+    return emitSetPropertyPolymorphic(ins, obj, temp, value);
+}
+
+bool
+CodeGenerator::visitElements(LElements *lir)
+{
+    Address elements(ToRegister(lir->object()), JSObject::offsetOfElements());
+    masm.loadPtr(elements, ToRegister(lir->output()));
+    return true;
+}
+
+typedef bool (*ConvertElementsToDoublesFn)(JSContext *, uintptr_t);
+static const VMFunction ConvertElementsToDoublesInfo =
+    FunctionInfo<ConvertElementsToDoublesFn>(ObjectElements::ConvertElementsToDoubles);
+
+bool
+CodeGenerator::visitConvertElementsToDoubles(LConvertElementsToDoubles *lir)
+{
+    Register elements = ToRegister(lir->elements());
+
+    OutOfLineCode *ool = oolCallVM(ConvertElementsToDoublesInfo, lir,
+                                   (ArgList(), elements), StoreNothing());
+    if (!ool)
+        return false;
+
+    Address convertedAddress(elements, ObjectElements::offsetOfFlags());
+    Imm32 bit(ObjectElements::CONVERT_DOUBLE_ELEMENTS);
+    masm.branchTest32(Assembler::Zero, convertedAddress, bit, ool->entry());
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitMaybeToDoubleElement(LMaybeToDoubleElement *lir)
+{
+    Register elements = ToRegister(lir->elements());
+    Register value = ToRegister(lir->value());
+    ValueOperand out = ToOutValue(lir);
+
+    FloatRegister temp = ToFloatRegister(lir->tempFloat());
+    Label convert, done;
+
+    // If the CONVERT_DOUBLE_ELEMENTS flag is set, convert the int32
+    // value to double. Else, just box it.
+    masm.branchTest32(Assembler::NonZero,
+                      Address(elements, ObjectElements::offsetOfFlags()),
+                      Imm32(ObjectElements::CONVERT_DOUBLE_ELEMENTS),
+                      &convert);
+
+    masm.tagValue(JSVAL_TYPE_INT32, value, out);
+    masm.jump(&done);
+
+    masm.bind(&convert);
+    masm.convertInt32ToDouble(value, temp);
+    masm.boxDouble(temp, out);
+
+    masm.bind(&done);
+    return true;
+}
+
+bool
+CodeGenerator::visitFunctionEnvironment(LFunctionEnvironment *lir)
+{
+    Address environment(ToRegister(lir->function()), JSFunction::offsetOfEnvironment());
+    masm.loadPtr(environment, ToRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitForkJoinContext(LForkJoinContext *lir)
+{
+    const Register tempReg = ToRegister(lir->getTempReg());
+
+    masm.setupUnalignedABICall(0, tempReg);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ForkJoinContextPar));
+    JS_ASSERT(ToRegister(lir->output()) == ReturnReg);
+    return true;
+}
+
+bool
+CodeGenerator::visitGuardThreadExclusive(LGuardThreadExclusive *lir)
+{
+    JS_ASSERT(gen->info().executionMode() == ParallelExecution);
+
+    const Register tempReg = ToRegister(lir->getTempReg());
+    masm.setupUnalignedABICall(2, tempReg);
+    masm.passABIArg(ToRegister(lir->forkJoinContext()));
+    masm.passABIArg(ToRegister(lir->object()));
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ParallelWriteGuard));
+
+    OutOfLineAbortPar *bail = oolAbortPar(ParallelBailoutIllegalWrite, lir);
+    if (!bail)
+        return false;
+
+    // branch to the OOL failure code if false is returned
+    masm.branchIfFalseBool(ReturnReg, bail->entry());
+    return true;
+}
+
+bool
+CodeGenerator::visitGuardObjectIdentity(LGuardObjectIdentity *guard)
+{
+    Register obj = ToRegister(guard->input());
+
+    Assembler::Condition cond =
+        guard->mir()->bailOnEquality() ? Assembler::Equal : Assembler::NotEqual;
+    return bailoutCmpPtr(cond, obj, ImmGCPtr(guard->mir()->singleObject()), guard->snapshot());
+}
+
+bool
+CodeGenerator::visitTypeBarrierV(LTypeBarrierV *lir)
+{
+    ValueOperand operand = ToValue(lir, LTypeBarrierV::Input);
+    Register scratch = ToTempRegisterOrInvalid(lir->temp());
+
+    Label miss;
+    masm.guardTypeSet(operand, lir->mir()->resultTypeSet(), scratch, &miss);
+    if (!bailoutFrom(&miss, lir->snapshot()))
+        return false;
+    return true;
+}
+
+bool
+CodeGenerator::visitTypeBarrierO(LTypeBarrierO *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register scratch = ToTempRegisterOrInvalid(lir->temp());
+
+    Label miss;
+    masm.guardObjectType(obj, lir->mir()->resultTypeSet(), scratch, &miss);
+    if (!bailoutFrom(&miss, lir->snapshot()))
+        return false;
+    return true;
+}
+
+bool
+CodeGenerator::visitMonitorTypes(LMonitorTypes *lir)
+{
+    ValueOperand operand = ToValue(lir, LMonitorTypes::Input);
+    Register scratch = ToTempUnboxRegister(lir->temp());
+
+    Label matched, miss;
+    masm.guardTypeSet(operand, lir->mir()->typeSet(), scratch, &miss);
+    if (!bailoutFrom(&miss, lir->snapshot()))
+        return false;
+    return true;
+}
+
+#ifdef JSGC_GENERATIONAL
+// Out-of-line path to update the store buffer.
+class OutOfLineCallPostWriteBarrier : public OutOfLineCodeBase<CodeGenerator>
+{
+    LInstruction *lir_;
+    const LAllocation *object_;
+
+  public:
+    OutOfLineCallPostWriteBarrier(LInstruction *lir, const LAllocation *object)
+      : lir_(lir), object_(object)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineCallPostWriteBarrier(this);
+    }
+
+    LInstruction *lir() const {
+        return lir_;
+    }
+    const LAllocation *object() const {
+        return object_;
+    }
+};
+
+bool
+CodeGenerator::visitOutOfLineCallPostWriteBarrier(OutOfLineCallPostWriteBarrier *ool)
+{
+    saveLiveVolatile(ool->lir());
+
+    const LAllocation *obj = ool->object();
+
+    GeneralRegisterSet regs = GeneralRegisterSet::Volatile();
+
+    Register objreg;
+    bool isGlobal = false;
+    if (obj->isConstant()) {
+        JSObject *object = &obj->toConstant()->toObject();
+        isGlobal = object->is<GlobalObject>();
+        objreg = regs.takeAny();
+        masm.movePtr(ImmGCPtr(object), objreg);
+    } else {
+        objreg = ToRegister(obj);
+        regs.takeUnchecked(objreg);
+    }
+
+    Register runtimereg = regs.takeAny();
+    masm.mov(ImmPtr(GetIonContext()->runtime), runtimereg);
+
+    void (*fun)(JSRuntime*, JSObject*) = isGlobal ? PostGlobalWriteBarrier : PostWriteBarrier;
+    masm.setupUnalignedABICall(2, regs.takeAny());
+    masm.passABIArg(runtimereg);
+    masm.passABIArg(objreg);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, fun));
+
+    restoreLiveVolatile(ool->lir());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+#endif
+
+bool
+CodeGenerator::visitPostWriteBarrierO(LPostWriteBarrierO *lir)
+{
+#ifdef JSGC_GENERATIONAL
+    OutOfLineCallPostWriteBarrier *ool = new(alloc()) OutOfLineCallPostWriteBarrier(lir, lir->object());
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Register temp = ToTempRegisterOrInvalid(lir->temp());
+
+    if (lir->object()->isConstant()) {
+#ifdef DEBUG
+        const Nursery &nursery = GetIonContext()->runtime->gcNursery();
+        JS_ASSERT(!nursery.isInside(&lir->object()->toConstant()->toObject()));
+#endif
+    } else {
+        masm.branchPtrInNurseryRange(ToRegister(lir->object()), temp, ool->rejoin());
+    }
+
+    masm.branchPtrInNurseryRange(ToRegister(lir->value()), temp, ool->entry());
+
+    masm.bind(ool->rejoin());
+#endif
+    return true;
+}
+
+bool
+CodeGenerator::visitPostWriteBarrierV(LPostWriteBarrierV *lir)
+{
+#ifdef JSGC_GENERATIONAL
+    OutOfLineCallPostWriteBarrier *ool = new(alloc()) OutOfLineCallPostWriteBarrier(lir, lir->object());
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Register temp = ToTempRegisterOrInvalid(lir->temp());
+
+    if (lir->object()->isConstant()) {
+#ifdef DEBUG
+        const Nursery &nursery = GetIonContext()->runtime->gcNursery();
+        JS_ASSERT(!nursery.isInside(&lir->object()->toConstant()->toObject()));
+#endif
+    } else {
+        masm.branchPtrInNurseryRange(ToRegister(lir->object()), temp, ool->rejoin());
+    }
+
+    ValueOperand value = ToValue(lir, LPostWriteBarrierV::Input);
+    masm.branchValueIsNurseryObject(value, temp, ool->entry());
+
+    masm.bind(ool->rejoin());
+#endif
+    return true;
+}
+
+bool
+CodeGenerator::visitCallNative(LCallNative *call)
+{
+    JSFunction *target = call->getSingleTarget();
+    JS_ASSERT(target);
+    JS_ASSERT(target->isNative());
+
+    int callargslot = call->argslot();
+    int unusedStack = StackOffsetOfPassedArg(callargslot);
+
+    // Registers used for callWithABI() argument-passing.
+    const Register argContextReg   = ToRegister(call->getArgContextReg());
+    const Register argUintNReg     = ToRegister(call->getArgUintNReg());
+    const Register argVpReg        = ToRegister(call->getArgVpReg());
+
+    // Misc. temporary registers.
+    const Register tempReg = ToRegister(call->getTempReg());
+
+    DebugOnly<uint32_t> initialStack = masm.framePushed();
+
+    masm.checkStackAlignment();
+
+    // Sequential native functions have the signature:
+    //  bool (*)(JSContext *, unsigned, Value *vp)
+    // and parallel native functions have the signature:
+    //  ParallelResult (*)(ForkJoinContext *, unsigned, Value *vp)
+    // Where vp[0] is space for an outparam, vp[1] is |this|, and vp[2] onward
+    // are the function arguments.
+
+    // Allocate space for the outparam, moving the StackPointer to what will be &vp[1].
+    masm.adjustStack(unusedStack);
+
+    // Push a Value containing the callee object: natives are allowed to access their callee before
+    // setitng the return value. The StackPointer is moved to &vp[0].
+    masm.Push(ObjectValue(*target));
+
+    // Preload arguments into registers.
+    //
+    // Note that for parallel execution, loadContext does an ABI call, so we
+    // need to do this before we load the other argument registers, otherwise
+    // we'll hose them.
+    ExecutionMode executionMode = gen->info().executionMode();
+    masm.loadContext(argContextReg, tempReg, executionMode);
+    masm.move32(Imm32(call->numStackArgs()), argUintNReg);
+    masm.movePtr(StackPointer, argVpReg);
+
+    masm.Push(argUintNReg);
+
+    // Construct native exit frame.
+    uint32_t safepointOffset;
+    if (!masm.buildFakeExitFrame(tempReg, &safepointOffset))
+        return false;
+    masm.enterFakeExitFrame(argContextReg, tempReg, executionMode);
+
+    if (!markSafepointAt(safepointOffset, call))
+        return false;
+
+    // Construct and execute call.
+    masm.setupUnalignedABICall(3, tempReg);
+    masm.passABIArg(argContextReg);
+    masm.passABIArg(argUintNReg);
+    masm.passABIArg(argVpReg);
+
+    switch (executionMode) {
+      case SequentialExecution:
+        masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, target->native()));
+        break;
+
+      case ParallelExecution:
+        masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, target->parallelNative()));
+        break;
+
+      default:
+        MOZ_ASSUME_UNREACHABLE("No such execution mode");
+    }
+
+    // Test for failure.
+    masm.branchIfFalseBool(ReturnReg, masm.failureLabel(executionMode));
+
+    // Load the outparam vp[0] into output register(s).
+    masm.loadValue(Address(StackPointer, IonNativeExitFrameLayout::offsetOfResult()), JSReturnOperand);
+
+    // The next instruction is removing the footer of the exit frame, so there
+    // is no need for leaveFakeExitFrame.
+
+    // Move the StackPointer back to its original location, unwinding the native exit frame.
+    masm.adjustStack(IonNativeExitFrameLayout::Size() - unusedStack);
+    JS_ASSERT(masm.framePushed() == initialStack);
+
+    dropArguments(call->numStackArgs() + 1);
+    return true;
+}
+
+bool
+CodeGenerator::visitCallDOMNative(LCallDOMNative *call)
+{
+    JSFunction *target = call->getSingleTarget();
+    JS_ASSERT(target);
+    JS_ASSERT(target->isNative());
+    JS_ASSERT(target->jitInfo());
+    JS_ASSERT(call->mir()->isCallDOMNative());
+
+    int callargslot = call->argslot();
+    int unusedStack = StackOffsetOfPassedArg(callargslot);
+
+    // Registers used for callWithABI() argument-passing.
+    const Register argJSContext = ToRegister(call->getArgJSContext());
+    const Register argObj       = ToRegister(call->getArgObj());
+    const Register argPrivate   = ToRegister(call->getArgPrivate());
+    const Register argArgs      = ToRegister(call->getArgArgs());
+
+    DebugOnly<uint32_t> initialStack = masm.framePushed();
+
+    masm.checkStackAlignment();
+
+    // DOM methods have the signature:
+    //  bool (*)(JSContext *, HandleObject, void *private, const JSJitMethodCallArgs& args)
+    // Where args is initialized from an argc and a vp, vp[0] is space for an
+    // outparam and the callee, vp[1] is |this|, and vp[2] onward are the
+    // function arguments.  Note that args stores the argv, not the vp, and
+    // argv == vp + 2.
+
+    // Nestle the stack up against the pushed arguments, leaving StackPointer at
+    // &vp[1]
+    masm.adjustStack(unusedStack);
+    // argObj is filled with the extracted object, then returned.
+    Register obj = masm.extractObject(Address(StackPointer, 0), argObj);
+    JS_ASSERT(obj == argObj);
+
+    // Push a Value containing the callee object: natives are allowed to access their callee before
+    // setitng the return value. After this the StackPointer points to &vp[0].
+    masm.Push(ObjectValue(*target));
+
+    // Now compute the argv value.  Since StackPointer is pointing to &vp[0] and
+    // argv is &vp[2] we just need to add 2*sizeof(Value) to the current
+    // StackPointer.
+    JS_STATIC_ASSERT(JSJitMethodCallArgsTraits::offsetOfArgv == 0);
+    JS_STATIC_ASSERT(JSJitMethodCallArgsTraits::offsetOfArgc ==
+                     IonDOMMethodExitFrameLayoutTraits::offsetOfArgcFromArgv);
+    masm.computeEffectiveAddress(Address(StackPointer, 2 * sizeof(Value)), argArgs);
+
+    // GetReservedSlot(obj, DOM_OBJECT_SLOT).toPrivate()
+    masm.loadPrivate(Address(obj, JSObject::getFixedSlotOffset(0)), argPrivate);
+
+    // Push argc from the call instruction into what will become the IonExitFrame
+    masm.Push(Imm32(call->numStackArgs()));
+
+    // Push our argv onto the stack
+    masm.Push(argArgs);
+    // And store our JSJitMethodCallArgs* in argArgs.
+    masm.movePtr(StackPointer, argArgs);
+
+    // Push |this| object for passing HandleObject. We push after argc to
+    // maintain the same sp-relative location of the object pointer with other
+    // DOMExitFrames.
+    masm.Push(argObj);
+    masm.movePtr(StackPointer, argObj);
+
+    // Construct native exit frame.
+    uint32_t safepointOffset;
+    if (!masm.buildFakeExitFrame(argJSContext, &safepointOffset))
+        return false;
+    masm.enterFakeExitFrame(ION_FRAME_DOMMETHOD);
+
+    if (!markSafepointAt(safepointOffset, call))
+        return false;
+
+    // Construct and execute call.
+    masm.setupUnalignedABICall(4, argJSContext);
+
+    masm.loadJSContext(argJSContext);
+
+    masm.passABIArg(argJSContext);
+    masm.passABIArg(argObj);
+    masm.passABIArg(argPrivate);
+    masm.passABIArg(argArgs);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, target->jitInfo()->method));
+
+    if (target->jitInfo()->isInfallible) {
+        masm.loadValue(Address(StackPointer, IonDOMMethodExitFrameLayout::offsetOfResult()),
+                       JSReturnOperand);
+    } else {
+        // Test for failure.
+        masm.branchIfFalseBool(ReturnReg, masm.exceptionLabel());
+
+        // Load the outparam vp[0] into output register(s).
+        masm.loadValue(Address(StackPointer, IonDOMMethodExitFrameLayout::offsetOfResult()),
+                       JSReturnOperand);
+    }
+
+    // The next instruction is removing the footer of the exit frame, so there
+    // is no need for leaveFakeExitFrame.
+
+    // Move the StackPointer back to its original location, unwinding the native exit frame.
+    masm.adjustStack(IonDOMMethodExitFrameLayout::Size() - unusedStack);
+    JS_ASSERT(masm.framePushed() == initialStack);
+
+    dropArguments(call->numStackArgs() + 1);
+    return true;
+}
+
+typedef bool (*GetIntrinsicValueFn)(JSContext *cx, HandlePropertyName, MutableHandleValue);
+static const VMFunction GetIntrinsicValueInfo =
+    FunctionInfo<GetIntrinsicValueFn>(GetIntrinsicValue);
+
+bool
+CodeGenerator::visitCallGetIntrinsicValue(LCallGetIntrinsicValue *lir)
+{
+    pushArg(ImmGCPtr(lir->mir()->name()));
+    return callVM(GetIntrinsicValueInfo, lir);
+}
+
+typedef bool (*InvokeFunctionFn)(JSContext *, HandleObject, uint32_t, Value *, Value *);
+static const VMFunction InvokeFunctionInfo = FunctionInfo<InvokeFunctionFn>(InvokeFunction);
+
+bool
+CodeGenerator::emitCallInvokeFunction(LInstruction *call, Register calleereg,
+                                      uint32_t argc, uint32_t unusedStack)
+{
+    // Nestle %esp up to the argument vector.
+    // Each path must account for framePushed_ separately, for callVM to be valid.
+    masm.freeStack(unusedStack);
+
+    pushArg(StackPointer); // argv.
+    pushArg(Imm32(argc));  // argc.
+    pushArg(calleereg);    // JSFunction *.
+
+    if (!callVM(InvokeFunctionInfo, call))
+        return false;
+
+    // Un-nestle %esp from the argument vector. No prefix was pushed.
+    masm.reserveStack(unusedStack);
+    return true;
+}
+
+bool
+CodeGenerator::visitCallGeneric(LCallGeneric *call)
+{
+    Register calleereg = ToRegister(call->getFunction());
+    Register objreg    = ToRegister(call->getTempObject());
+    Register nargsreg  = ToRegister(call->getNargsReg());
+    uint32_t unusedStack = StackOffsetOfPassedArg(call->argslot());
+    ExecutionMode executionMode = gen->info().executionMode();
+    Label invoke, thunk, makeCall, end;
+
+    // Known-target case is handled by LCallKnown.
+    JS_ASSERT(!call->hasSingleTarget());
+
+    // Generate an ArgumentsRectifier.
+    JitCode *argumentsRectifier = gen->jitRuntime()->getArgumentsRectifier(executionMode);
+
+    masm.checkStackAlignment();
+
+    // Guard that calleereg is actually a function object.
+    masm.loadObjClass(calleereg, nargsreg);
+    masm.branchPtr(Assembler::NotEqual, nargsreg, ImmPtr(&JSFunction::class_), &invoke);
+
+    // Guard that calleereg is an interpreted function with a JSScript.
+    // If we are constructing, also ensure the callee is a constructor.
+    if (call->mir()->isConstructing())
+        masm.branchIfNotInterpretedConstructor(calleereg, nargsreg, &invoke);
+    else
+        masm.branchIfFunctionHasNoScript(calleereg, &invoke);
+
+    // Knowing that calleereg is a non-native function, load the JSScript.
+    masm.loadPtr(Address(calleereg, JSFunction::offsetOfNativeOrScript()), objreg);
+
+    // Load script jitcode.
+    masm.loadBaselineOrIonRaw(objreg, objreg, executionMode, &invoke);
+
+    // Nestle the StackPointer up to the argument vector.
+    masm.freeStack(unusedStack);
+
+    // Construct the IonFramePrefix.
+    uint32_t descriptor = MakeFrameDescriptor(masm.framePushed(), JitFrame_IonJS);
+    masm.Push(Imm32(call->numActualArgs()));
+    masm.Push(calleereg);
+    masm.Push(Imm32(descriptor));
+
+    // Check whether the provided arguments satisfy target argc.
+    masm.load16ZeroExtend(Address(calleereg, JSFunction::offsetOfNargs()), nargsreg);
+    masm.branch32(Assembler::Above, nargsreg, Imm32(call->numStackArgs()), &thunk);
+    masm.jump(&makeCall);
+
+    // Argument fixed needed. Load the ArgumentsRectifier.
+    masm.bind(&thunk);
+    {
+        JS_ASSERT(ArgumentsRectifierReg != objreg);
+        masm.movePtr(ImmGCPtr(argumentsRectifier), objreg); // Necessary for GC marking.
+        masm.loadPtr(Address(objreg, JitCode::offsetOfCode()), objreg);
+        masm.move32(Imm32(call->numStackArgs()), ArgumentsRectifierReg);
+    }
+
+    // Finally call the function in objreg.
+    masm.bind(&makeCall);
+    uint32_t callOffset = masm.callIon(objreg);
+    if (!markSafepointAt(callOffset, call))
+        return false;
+
+    // Increment to remove IonFramePrefix; decrement to fill FrameSizeClass.
+    // The return address has already been removed from the Ion frame.
+    int prefixGarbage = sizeof(IonJSFrameLayout) - sizeof(void *);
+    masm.adjustStack(prefixGarbage - unusedStack);
+    masm.jump(&end);
+
+    // Handle uncompiled or native functions.
+    masm.bind(&invoke);
+    switch (executionMode) {
+      case SequentialExecution:
+        if (!emitCallInvokeFunction(call, calleereg, call->numActualArgs(), unusedStack))
+            return false;
+        break;
+
+      case ParallelExecution:
+        if (!emitCallToUncompiledScriptPar(call, calleereg))
+            return false;
+        break;
+
+      default:
+        MOZ_ASSUME_UNREACHABLE("No such execution mode");
+    }
+
+    masm.bind(&end);
+
+    // If the return value of the constructing function is Primitive,
+    // replace the return value with the Object from CreateThis.
+    if (call->mir()->isConstructing()) {
+        Label notPrimitive;
+        masm.branchTestPrimitive(Assembler::NotEqual, JSReturnOperand, &notPrimitive);
+        masm.loadValue(Address(StackPointer, unusedStack), JSReturnOperand);
+        masm.bind(&notPrimitive);
+    }
+
+    if (!checkForAbortPar(call))
+        return false;
+
+    dropArguments(call->numStackArgs() + 1);
+    return true;
+}
+
+// Generates a call to CallToUncompiledScriptPar() and then bails out.
+// |calleeReg| should contain the JSFunction*.
+bool
+CodeGenerator::emitCallToUncompiledScriptPar(LInstruction *lir, Register calleeReg)
+{
+    OutOfLineCode *bail = oolAbortPar(ParallelBailoutCalledToUncompiledScript, lir);
+    if (!bail)
+        return false;
+
+    masm.movePtr(calleeReg, CallTempReg0);
+    masm.setupUnalignedABICall(1, CallTempReg1);
+    masm.passABIArg(CallTempReg0);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, CallToUncompiledScriptPar));
+    masm.jump(bail->entry());
+    return true;
+}
+
+bool
+CodeGenerator::visitCallKnown(LCallKnown *call)
+{
+    Register calleereg = ToRegister(call->getFunction());
+    Register objreg    = ToRegister(call->getTempObject());
+    uint32_t unusedStack = StackOffsetOfPassedArg(call->argslot());
+    DebugOnly<JSFunction *> target = call->getSingleTarget();
+    ExecutionMode executionMode = gen->info().executionMode();
+    Label end, uncompiled;
+
+    // Native single targets are handled by LCallNative.
+    JS_ASSERT(!target->isNative());
+    // Missing arguments must have been explicitly appended by the IonBuilder.
+    JS_ASSERT(target->nargs() <= call->numStackArgs());
+
+    JS_ASSERT_IF(call->mir()->isConstructing(), target->isInterpretedConstructor());
+
+    masm.checkStackAlignment();
+
+    // The calleereg is known to be a non-native function, but might point to
+    // a LazyScript instead of a JSScript.
+    masm.branchIfFunctionHasNoScript(calleereg, &uncompiled);
+
+    // Knowing that calleereg is a non-native function, load the JSScript.
+    masm.loadPtr(Address(calleereg, JSFunction::offsetOfNativeOrScript()), objreg);
+
+    // Load script jitcode.
+    if (call->mir()->needsArgCheck())
+        masm.loadBaselineOrIonRaw(objreg, objreg, executionMode, &uncompiled);
+    else
+        masm.loadBaselineOrIonNoArgCheck(objreg, objreg, executionMode, &uncompiled);
+
+    // Nestle the StackPointer up to the argument vector.
+    masm.freeStack(unusedStack);
+
+    // Construct the IonFramePrefix.
+    uint32_t descriptor = MakeFrameDescriptor(masm.framePushed(), JitFrame_IonJS);
+    masm.Push(Imm32(call->numActualArgs()));
+    masm.Push(calleereg);
+    masm.Push(Imm32(descriptor));
+
+    // Finally call the function in objreg.
+    uint32_t callOffset = masm.callIon(objreg);
+    if (!markSafepointAt(callOffset, call))
+        return false;
+
+    // Increment to remove IonFramePrefix; decrement to fill FrameSizeClass.
+    // The return address has already been removed from the Ion frame.
+    int prefixGarbage = sizeof(IonJSFrameLayout) - sizeof(void *);
+    masm.adjustStack(prefixGarbage - unusedStack);
+    masm.jump(&end);
+
+    // Handle uncompiled functions.
+    masm.bind(&uncompiled);
+    switch (executionMode) {
+      case SequentialExecution:
+        if (!emitCallInvokeFunction(call, calleereg, call->numActualArgs(), unusedStack))
+            return false;
+        break;
+
+      case ParallelExecution:
+        if (!emitCallToUncompiledScriptPar(call, calleereg))
+            return false;
+        break;
+
+      default:
+        MOZ_ASSUME_UNREACHABLE("No such execution mode");
+    }
+
+    masm.bind(&end);
+
+    if (!checkForAbortPar(call))
+        return false;
+
+    // If the return value of the constructing function is Primitive,
+    // replace the return value with the Object from CreateThis.
+    if (call->mir()->isConstructing()) {
+        Label notPrimitive;
+        masm.branchTestPrimitive(Assembler::NotEqual, JSReturnOperand, &notPrimitive);
+        masm.loadValue(Address(StackPointer, unusedStack), JSReturnOperand);
+        masm.bind(&notPrimitive);
+    }
+
+    dropArguments(call->numStackArgs() + 1);
+    return true;
+}
+
+bool
+CodeGenerator::checkForAbortPar(LInstruction *lir)
+{
+    // In parallel mode, if we call another ion-compiled function and
+    // it returns JS_ION_ERROR, that indicates a bailout that we have
+    // to propagate up the stack.
+    ExecutionMode executionMode = gen->info().executionMode();
+    if (executionMode == ParallelExecution) {
+        OutOfLinePropagateAbortPar *bail = oolPropagateAbortPar(lir);
+        if (!bail)
+            return false;
+        masm.branchTestMagic(Assembler::Equal, JSReturnOperand, bail->entry());
+    }
+    return true;
+}
+
+bool
+CodeGenerator::emitCallInvokeFunction(LApplyArgsGeneric *apply, Register extraStackSize)
+{
+    Register objreg = ToRegister(apply->getTempObject());
+    JS_ASSERT(objreg != extraStackSize);
+
+    // Push the space used by the arguments.
+    masm.movePtr(StackPointer, objreg);
+    masm.Push(extraStackSize);
+
+    pushArg(objreg);                           // argv.
+    pushArg(ToRegister(apply->getArgc()));     // argc.
+    pushArg(ToRegister(apply->getFunction())); // JSFunction *.
+
+    // This specialization og callVM restore the extraStackSize after the call.
+    if (!callVM(InvokeFunctionInfo, apply, &extraStackSize))
+        return false;
+
+    masm.Pop(extraStackSize);
+    return true;
+}
+
+// Do not bailout after the execution of this function since the stack no longer
+// correspond to what is expected by the snapshots.
+void
+CodeGenerator::emitPushArguments(LApplyArgsGeneric *apply, Register extraStackSpace)
+{
+    // Holds the function nargs. Initially undefined.
+    Register argcreg = ToRegister(apply->getArgc());
+
+    Register copyreg = ToRegister(apply->getTempObject());
+    size_t argvOffset = frameSize() + IonJSFrameLayout::offsetOfActualArgs();
+    Label end;
+
+    // Initialize the loop counter AND Compute the stack usage (if == 0)
+    masm.movePtr(argcreg, extraStackSpace);
+    masm.branchTestPtr(Assembler::Zero, argcreg, argcreg, &end);
+
+    // Copy arguments.
+    {
+        Register count = extraStackSpace; // <- argcreg
+        Label loop;
+        masm.bind(&loop);
+
+        // We remove sizeof(void*) from argvOffset because withtout it we target
+        // the address after the memory area that we want to copy.
+        BaseIndex disp(StackPointer, argcreg, ScaleFromElemWidth(sizeof(Value)), argvOffset - sizeof(void*));
+
+        // Do not use Push here because other this account to 1 in the framePushed
+        // instead of 0.  These push are only counted by argcreg.
+        masm.loadPtr(disp, copyreg);
+        masm.push(copyreg);
+
+        // Handle 32 bits architectures.
+        if (sizeof(Value) == 2 * sizeof(void*)) {
+            masm.loadPtr(disp, copyreg);
+            masm.push(copyreg);
+        }
+
+        masm.decBranchPtr(Assembler::NonZero, count, Imm32(1), &loop);
+    }
+
+    // Compute the stack usage.
+    masm.movePtr(argcreg, extraStackSpace);
+    masm.lshiftPtr(Imm32::ShiftOf(ScaleFromElemWidth(sizeof(Value))), extraStackSpace);
+
+    // Join with all arguments copied and the extra stack usage computed.
+    masm.bind(&end);
+
+    // Push |this|.
+    masm.addPtr(Imm32(sizeof(Value)), extraStackSpace);
+    masm.pushValue(ToValue(apply, LApplyArgsGeneric::ThisIndex));
+}
+
+void
+CodeGenerator::emitPopArguments(LApplyArgsGeneric *apply, Register extraStackSpace)
+{
+    // Pop |this| and Arguments.
+    masm.freeStack(extraStackSpace);
+}
+
+bool
+CodeGenerator::visitApplyArgsGeneric(LApplyArgsGeneric *apply)
+{
+    // Holds the function object.
+    Register calleereg = ToRegister(apply->getFunction());
+
+    // Temporary register for modifying the function object.
+    Register objreg = ToRegister(apply->getTempObject());
+    Register copyreg = ToRegister(apply->getTempCopy());
+
+    // Holds the function nargs. Initially undefined.
+    Register argcreg = ToRegister(apply->getArgc());
+
+    // Unless already known, guard that calleereg is actually a function object.
+    if (!apply->hasSingleTarget()) {
+        masm.loadObjClass(calleereg, objreg);
+
+        ImmPtr ptr = ImmPtr(&JSFunction::class_);
+        if (!bailoutCmpPtr(Assembler::NotEqual, objreg, ptr, apply->snapshot()))
+            return false;
+    }
+
+    // Copy the arguments of the current function.
+    emitPushArguments(apply, copyreg);
+
+    masm.checkStackAlignment();
+
+    // If the function is known to be uncompilable, only emit the call to InvokeFunction.
+    ExecutionMode executionMode = gen->info().executionMode();
+    if (apply->hasSingleTarget()) {
+        JSFunction *target = apply->getSingleTarget();
+        if (target->isNative()) {
+            if (!emitCallInvokeFunction(apply, copyreg))
+                return false;
+            emitPopArguments(apply, copyreg);
+            return true;
+        }
+    }
+
+    Label end, invoke;
+
+    // Guard that calleereg is an interpreted function with a JSScript:
+    if (!apply->hasSingleTarget()) {
+        masm.branchIfFunctionHasNoScript(calleereg, &invoke);
+    } else {
+        // Native single targets are handled by LCallNative.
+        JS_ASSERT(!apply->getSingleTarget()->isNative());
+    }
+
+    // Knowing that calleereg is a non-native function, load the JSScript.
+    masm.loadPtr(Address(calleereg, JSFunction::offsetOfNativeOrScript()), objreg);
+
+    // Load script jitcode.
+    masm.loadBaselineOrIonRaw(objreg, objreg, executionMode, &invoke);
+
+    // Call with an Ion frame or a rectifier frame.
+    {
+        // Create the frame descriptor.
+        unsigned pushed = masm.framePushed();
+        masm.addPtr(Imm32(pushed), copyreg);
+        masm.makeFrameDescriptor(copyreg, JitFrame_IonJS);
+
+        masm.Push(argcreg);
+        masm.Push(calleereg);
+        masm.Push(copyreg); // descriptor
+
+        Label underflow, rejoin;
+
+        // Check whether the provided arguments satisfy target argc.
+        if (!apply->hasSingleTarget()) {
+            masm.load16ZeroExtend(Address(calleereg, JSFunction::offsetOfNargs()), copyreg);
+            masm.branch32(Assembler::Below, argcreg, copyreg, &underflow);
+        } else {
+            masm.branch32(Assembler::Below, argcreg, Imm32(apply->getSingleTarget()->nargs()),
+                          &underflow);
+        }
+
+        // Skip the construction of the rectifier frame because we have no
+        // underflow.
+        masm.jump(&rejoin);
+
+        // Argument fixup needed. Get ready to call the argumentsRectifier.
+        {
+            masm.bind(&underflow);
+
+            // Hardcode the address of the argumentsRectifier code.
+            JitCode *argumentsRectifier = gen->jitRuntime()->getArgumentsRectifier(executionMode);
+
+            JS_ASSERT(ArgumentsRectifierReg != objreg);
+            masm.movePtr(ImmGCPtr(argumentsRectifier), objreg); // Necessary for GC marking.
+            masm.loadPtr(Address(objreg, JitCode::offsetOfCode()), objreg);
+            masm.movePtr(argcreg, ArgumentsRectifierReg);
+        }
+
+        masm.bind(&rejoin);
+
+        // Finally call the function in objreg, as assigned by one of the paths above.
+        uint32_t callOffset = masm.callIon(objreg);
+        if (!markSafepointAt(callOffset, apply))
+            return false;
+
+        // Recover the number of arguments from the frame descriptor.
+        masm.loadPtr(Address(StackPointer, 0), copyreg);
+        masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), copyreg);
+        masm.subPtr(Imm32(pushed), copyreg);
+
+        // Increment to remove IonFramePrefix; decrement to fill FrameSizeClass.
+        // The return address has already been removed from the Ion frame.
+        int prefixGarbage = sizeof(IonJSFrameLayout) - sizeof(void *);
+        masm.adjustStack(prefixGarbage);
+        masm.jump(&end);
+    }
+
+    // Handle uncompiled or native functions.
+    {
+        masm.bind(&invoke);
+        if (!emitCallInvokeFunction(apply, copyreg))
+            return false;
+    }
+
+    // Pop arguments and continue.
+    masm.bind(&end);
+    emitPopArguments(apply, copyreg);
+
+    return true;
+}
+
+typedef bool (*ArraySpliceDenseFn)(JSContext *, HandleObject, uint32_t, uint32_t);
+static const VMFunction ArraySpliceDenseInfo = FunctionInfo<ArraySpliceDenseFn>(ArraySpliceDense);
+
+bool
+CodeGenerator::visitArraySplice(LArraySplice *lir)
+{
+    pushArg(ToRegister(lir->getDeleteCount()));
+    pushArg(ToRegister(lir->getStart()));
+    pushArg(ToRegister(lir->getObject()));
+    return callVM(ArraySpliceDenseInfo, lir);
+}
+
+
+bool
+CodeGenerator::visitBail(LBail *lir)
+{
+    return bailout(lir->snapshot());
+}
+
+bool
+CodeGenerator::visitGetDynamicName(LGetDynamicName *lir)
+{
+    Register scopeChain = ToRegister(lir->getScopeChain());
+    Register name = ToRegister(lir->getName());
+    Register temp1 = ToRegister(lir->temp1());
+    Register temp2 = ToRegister(lir->temp2());
+    Register temp3 = ToRegister(lir->temp3());
+
+    masm.loadJSContext(temp3);
+
+    /* Make space for the outparam. */
+    masm.adjustStack(-int32_t(sizeof(Value)));
+    masm.movePtr(StackPointer, temp2);
+
+    masm.setupUnalignedABICall(4, temp1);
+    masm.passABIArg(temp3);
+    masm.passABIArg(scopeChain);
+    masm.passABIArg(name);
+    masm.passABIArg(temp2);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, GetDynamicName));
+
+    const ValueOperand out = ToOutValue(lir);
+
+    masm.loadValue(Address(StackPointer, 0), out);
+    masm.adjustStack(sizeof(Value));
+
+    Label undefined;
+    masm.branchTestUndefined(Assembler::Equal, out, &undefined);
+    return bailoutFrom(&undefined, lir->snapshot());
+}
+
+bool
+CodeGenerator::emitFilterArgumentsOrEval(LInstruction *lir, Register string,
+                                         Register temp1, Register temp2)
+{
+    masm.loadJSContext(temp2);
+
+    masm.setupUnalignedABICall(2, temp1);
+    masm.passABIArg(temp2);
+    masm.passABIArg(string);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, FilterArgumentsOrEval));
+
+    Label bail;
+    masm.branchIfFalseBool(ReturnReg, &bail);
+    return bailoutFrom(&bail, lir->snapshot());
+}
+
+bool
+CodeGenerator::visitFilterArgumentsOrEvalS(LFilterArgumentsOrEvalS *lir)
+{
+    return emitFilterArgumentsOrEval(lir, ToRegister(lir->getString()),
+                                     ToRegister(lir->temp1()),
+                                     ToRegister(lir->temp2()));
+}
+
+bool
+CodeGenerator::visitFilterArgumentsOrEvalV(LFilterArgumentsOrEvalV *lir)
+{
+    ValueOperand input = ToValue(lir, LFilterArgumentsOrEvalV::Input);
+
+    // Act as nop on non-strings.
+    Label done;
+    masm.branchTestString(Assembler::NotEqual, input, &done);
+
+    if (!emitFilterArgumentsOrEval(lir, masm.extractString(input, ToRegister(lir->temp3())),
+                                   ToRegister(lir->temp1()), ToRegister(lir->temp2())))
+    {
+        return false;
+    }
+
+    masm.bind(&done);
+    return true;
+}
+
+typedef bool (*DirectEvalSFn)(JSContext *, HandleObject, HandleScript, HandleValue, HandleString,
+                              jsbytecode *, MutableHandleValue);
+static const VMFunction DirectEvalStringInfo = FunctionInfo<DirectEvalSFn>(DirectEvalStringFromIon);
+
+bool
+CodeGenerator::visitCallDirectEvalS(LCallDirectEvalS *lir)
+{
+    Register scopeChain = ToRegister(lir->getScopeChain());
+    Register string = ToRegister(lir->getString());
+
+    pushArg(ImmPtr(lir->mir()->pc()));
+    pushArg(string);
+    pushArg(ToValue(lir, LCallDirectEvalS::ThisValue));
+    pushArg(ImmGCPtr(gen->info().script()));
+    pushArg(scopeChain);
+
+    return callVM(DirectEvalStringInfo, lir);
+}
+
+typedef bool (*DirectEvalVFn)(JSContext *, HandleObject, HandleScript, HandleValue, HandleValue,
+                              jsbytecode *, MutableHandleValue);
+static const VMFunction DirectEvalValueInfo = FunctionInfo<DirectEvalVFn>(DirectEvalValueFromIon);
+
+bool
+CodeGenerator::visitCallDirectEvalV(LCallDirectEvalV *lir)
+{
+    Register scopeChain = ToRegister(lir->getScopeChain());
+
+    pushArg(ImmPtr(lir->mir()->pc()));
+    pushArg(ToValue(lir, LCallDirectEvalV::Argument));
+    pushArg(ToValue(lir, LCallDirectEvalV::ThisValue));
+    pushArg(ImmGCPtr(gen->info().script()));
+    pushArg(scopeChain);
+
+    return callVM(DirectEvalValueInfo, lir);
+}
+
+// Registers safe for use before generatePrologue().
+static const uint32_t EntryTempMask = Registers::TempMask & ~(1 << OsrFrameReg.code());
+
+bool
+CodeGenerator::generateArgumentsChecks(bool bailout)
+{
+    // This function can be used the normal way to check the argument types,
+    // before entering the function and bailout when arguments don't match.
+    // For debug purpose, this is can also be used to force/check that the
+    // arguments are correct. Upon fail it will hit a breakpoint.
+
+    MIRGraph &mir = gen->graph();
+    MResumePoint *rp = mir.entryResumePoint();
+
+    // Reserve the amount of stack the actual frame will use. We have to undo
+    // this before falling through to the method proper though, because the
+    // monomorphic call case will bypass this entire path.
+    masm.reserveStack(frameSize());
+
+    // No registers are allocated yet, so it's safe to grab anything.
+    Register temp = GeneralRegisterSet(EntryTempMask).getAny();
+
+    CompileInfo &info = gen->info();
+
+    Label miss;
+    for (uint32_t i = info.startArgSlot(); i < info.endArgSlot(); i++) {
+        // All initial parameters are guaranteed to be MParameters.
+        MParameter *param = rp->getOperand(i)->toParameter();
+        const types::TypeSet *types = param->resultTypeSet();
+        if (!types || types->unknown())
+            continue;
+
+        // Calculate the offset on the stack of the argument.
+        // (i - info.startArgSlot())    - Compute index of arg within arg vector.
+        // ... * sizeof(Value)          - Scale by value size.
+        // ArgToStackOffset(...)        - Compute displacement within arg vector.
+        int32_t offset = ArgToStackOffset((i - info.startArgSlot()) * sizeof(Value));
+        masm.guardTypeSet(Address(StackPointer, offset), types, temp, &miss);
+    }
+
+    if (miss.used()) {
+        if (bailout) {
+            if (!bailoutFrom(&miss, graph.entrySnapshot()))
+                return false;
+        } else {
+            Label success;
+            masm.jump(&success);
+            masm.bind(&miss);
+            masm.assumeUnreachable("Argument check fail.");
+            masm.bind(&success);
+        }
+    }
+
+    masm.freeStack(frameSize());
+
+    return true;
+}
+
+// Out-of-line path to report over-recursed error and fail.
+class CheckOverRecursedFailure : public OutOfLineCodeBase<CodeGenerator>
+{
+    LCheckOverRecursed *lir_;
+
+  public:
+    CheckOverRecursedFailure(LCheckOverRecursed *lir)
+      : lir_(lir)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitCheckOverRecursedFailure(this);
+    }
+
+    LCheckOverRecursed *lir() const {
+        return lir_;
+    }
+};
+
+bool
+CodeGenerator::visitCheckOverRecursed(LCheckOverRecursed *lir)
+{
+    // If we don't push anything on the stack, skip the check.
+    if (omitOverRecursedCheck())
+        return true;
+
+    // Ensure that this frame will not cross the stack limit.
+    // This is a weak check, justified by Ion using the C stack: we must always
+    // be some distance away from the actual limit, since if the limit is
+    // crossed, an error must be thrown, which requires more frames.
+    //
+    // It must always be possible to trespass past the stack limit.
+    // Ion may legally place frames very close to the limit. Calling additional
+    // C functions may then violate the limit without any checking.
+
+    // Since Ion frames exist on the C stack, the stack limit may be
+    // dynamically set by JS_SetThreadStackLimit() and JS_SetNativeStackQuota().
+    const void *limitAddr = GetIonContext()->runtime->addressOfJitStackLimit();
+
+    CheckOverRecursedFailure *ool = new(alloc()) CheckOverRecursedFailure(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    // Conditional forward (unlikely) branch to failure.
+    masm.branchPtr(Assembler::AboveOrEqual, AbsoluteAddress(limitAddr), StackPointer, ool->entry());
+    masm.bind(ool->rejoin());
+
+    return true;
+}
+
+typedef bool (*DefVarOrConstFn)(JSContext *, HandlePropertyName, unsigned, HandleObject);
+static const VMFunction DefVarOrConstInfo =
+    FunctionInfo<DefVarOrConstFn>(DefVarOrConst);
+
+bool
+CodeGenerator::visitDefVar(LDefVar *lir)
+{
+    Register scopeChain = ToRegister(lir->scopeChain());
+
+    pushArg(scopeChain); // JSObject *
+    pushArg(Imm32(lir->mir()->attrs())); // unsigned
+    pushArg(ImmGCPtr(lir->mir()->name())); // PropertyName *
+
+    if (!callVM(DefVarOrConstInfo, lir))
+        return false;
+
+    return true;
+}
+
+typedef bool (*DefFunOperationFn)(JSContext *, HandleScript, HandleObject, HandleFunction);
+static const VMFunction DefFunOperationInfo = FunctionInfo<DefFunOperationFn>(DefFunOperation);
+
+bool
+CodeGenerator::visitDefFun(LDefFun *lir)
+{
+    Register scopeChain = ToRegister(lir->scopeChain());
+
+    pushArg(ImmGCPtr(lir->mir()->fun()));
+    pushArg(scopeChain);
+    pushArg(ImmGCPtr(current->mir()->info().script()));
+
+    return callVM(DefFunOperationInfo, lir);
+}
+
+typedef bool (*ReportOverRecursedFn)(JSContext *);
+static const VMFunction CheckOverRecursedInfo =
+    FunctionInfo<ReportOverRecursedFn>(CheckOverRecursed);
+
+bool
+CodeGenerator::visitCheckOverRecursedFailure(CheckOverRecursedFailure *ool)
+{
+    // The OOL path is hit if the recursion depth has been exceeded.
+    // Throw an InternalError for over-recursion.
+
+    // LFunctionEnvironment can appear before LCheckOverRecursed, so we have
+    // to save all live registers to avoid crashes if CheckOverRecursed triggers
+    // a GC.
+    saveLive(ool->lir());
+
+    if (!callVM(CheckOverRecursedInfo, ool->lir()))
+        return false;
+
+    restoreLive(ool->lir());
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+// Out-of-line path to report over-recursed error and fail.
+class CheckOverRecursedFailurePar : public OutOfLineCodeBase<CodeGenerator>
+{
+    LCheckOverRecursedPar *lir_;
+
+  public:
+    CheckOverRecursedFailurePar(LCheckOverRecursedPar *lir)
+      : lir_(lir)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitCheckOverRecursedFailurePar(this);
+    }
+
+    LCheckOverRecursedPar *lir() const {
+        return lir_;
+    }
+};
+
+bool
+CodeGenerator::visitCheckOverRecursedPar(LCheckOverRecursedPar *lir)
+{
+    // See above: unlike visitCheckOverRecursed(), this code runs in
+    // parallel mode and hence uses the jitStackLimit from the current
+    // thread state.  Also, we must check the interrupt flags because
+    // on interrupt or abort, only the stack limit for the main thread
+    // is reset, not the worker threads.  See comment in vm/ForkJoin.h
+    // for more details.
+
+    Register cxReg = ToRegister(lir->forkJoinContext());
+    Register tempReg = ToRegister(lir->getTempReg());
+
+    masm.loadPtr(Address(cxReg, offsetof(ForkJoinContext, perThreadData)), tempReg);
+    masm.loadPtr(Address(tempReg, offsetof(PerThreadData, jitStackLimit)), tempReg);
+
+    // Conditional forward (unlikely) branch to failure.
+    CheckOverRecursedFailurePar *ool = new(alloc()) CheckOverRecursedFailurePar(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+    masm.branchPtr(Assembler::BelowOrEqual, StackPointer, tempReg, ool->entry());
+    masm.checkInterruptFlagPar(tempReg, ool->entry());
+    masm.bind(ool->rejoin());
+
+    return true;
+}
+
+bool
+CodeGenerator::visitCheckOverRecursedFailurePar(CheckOverRecursedFailurePar *ool)
+{
+    OutOfLinePropagateAbortPar *bail = oolPropagateAbortPar(ool->lir());
+    if (!bail)
+        return false;
+
+    // Avoid saving/restoring the temp register since we will put the
+    // ReturnReg into it below and we don't want to clobber that
+    // during PopRegsInMask():
+    LCheckOverRecursedPar *lir = ool->lir();
+    Register tempReg = ToRegister(lir->getTempReg());
+    RegisterSet saveSet(lir->safepoint()->liveRegs());
+    saveSet.takeUnchecked(tempReg);
+
+    masm.PushRegsInMask(saveSet);
+    masm.movePtr(ToRegister(lir->forkJoinContext()), CallTempReg0);
+    masm.setupUnalignedABICall(1, CallTempReg1);
+    masm.passABIArg(CallTempReg0);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, CheckOverRecursedPar));
+    masm.movePtr(ReturnReg, tempReg);
+    masm.PopRegsInMask(saveSet);
+    masm.branchIfFalseBool(tempReg, bail->entry());
+    masm.jump(ool->rejoin());
+
+    return true;
+}
+
+// Out-of-line path to report over-recursed error and fail.
+class OutOfLineInterruptCheckPar : public OutOfLineCodeBase<CodeGenerator>
+{
+  public:
+    LInterruptCheckPar *const lir;
+
+    OutOfLineInterruptCheckPar(LInterruptCheckPar *lir)
+      : lir(lir)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineInterruptCheckPar(this);
+    }
+};
+
+bool
+CodeGenerator::visitInterruptCheckPar(LInterruptCheckPar *lir)
+{
+    // First check for cx->shared->interrupt_.
+    OutOfLineInterruptCheckPar *ool = new(alloc()) OutOfLineInterruptCheckPar(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Register tempReg = ToRegister(lir->getTempReg());
+    masm.checkInterruptFlagPar(tempReg, ool->entry());
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitOutOfLineInterruptCheckPar(OutOfLineInterruptCheckPar *ool)
+{
+    OutOfLinePropagateAbortPar *bail = oolPropagateAbortPar(ool->lir);
+    if (!bail)
+        return false;
+
+    // Avoid saving/restoring the temp register since we will put the
+    // ReturnReg into it below and we don't want to clobber that
+    // during PopRegsInMask():
+    LInterruptCheckPar *lir = ool->lir;
+    Register tempReg = ToRegister(lir->getTempReg());
+    RegisterSet saveSet(lir->safepoint()->liveRegs());
+    saveSet.takeUnchecked(tempReg);
+
+    masm.PushRegsInMask(saveSet);
+    masm.movePtr(ToRegister(ool->lir->forkJoinContext()), CallTempReg0);
+    masm.setupUnalignedABICall(1, CallTempReg1);
+    masm.passABIArg(CallTempReg0);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, InterruptCheckPar));
+    masm.movePtr(ReturnReg, tempReg);
+    masm.PopRegsInMask(saveSet);
+    masm.branchIfFalseBool(tempReg, bail->entry());
+    masm.jump(ool->rejoin());
+
+    return true;
+}
+
+IonScriptCounts *
+CodeGenerator::maybeCreateScriptCounts()
+{
+    // If scripts are being profiled, create a new IonScriptCounts and attach
+    // it to the script. This must be done on the main thread.
+    JSContext *cx = GetIonContext()->cx;
+    if (!cx || !cx->runtime()->profilingScripts)
+        return nullptr;
+
+    CompileInfo *outerInfo = &gen->info();
+    JSScript *script = outerInfo->script();
+    if (!script)
+        return nullptr;
+
+    if (!script->hasScriptCounts() && !script->initScriptCounts(cx))
+        return nullptr;
+
+    IonScriptCounts *counts = js_new<IonScriptCounts>();
+    if (!counts || !counts->init(graph.numBlocks())) {
+        js_delete(counts);
+        return nullptr;
+    }
+
+    for (size_t i = 0; i < graph.numBlocks(); i++) {
+        MBasicBlock *block = graph.getBlock(i)->mir();
+
+        // Find a PC offset in the outermost script to use. If this block
+        // is from an inlined script, find a location in the outer script
+        // to associate information about the inlining with.
+        MResumePoint *resume = block->entryResumePoint();
+        while (resume->caller())
+            resume = resume->caller();
+
+        uint32_t offset = script->pcToOffset(resume->pc());
+        if (!counts->block(i).init(block->id(), offset, block->numSuccessors())) {
+            js_delete(counts);
+            return nullptr;
+        }
+
+        for (size_t j = 0; j < block->numSuccessors(); j++)
+            counts->block(i).setSuccessor(j, block->getSuccessor(j)->id());
+    }
+
+    script->addIonCounts(counts);
+    return counts;
+}
+
+// Structure for managing the state tracked for a block by script counters.
+struct ScriptCountBlockState
+{
+    IonBlockCounts &block;
+    MacroAssembler &masm;
+
+    Sprinter printer;
+
+  public:
+    ScriptCountBlockState(IonBlockCounts *block, MacroAssembler *masm)
+      : block(*block), masm(*masm), printer(GetIonContext()->cx)
+    {
+    }
+
+    bool init()
+    {
+        if (!printer.init())
+            return false;
+
+        // Bump the hit count for the block at the start. This code is not
+        // included in either the text for the block or the instruction byte
+        // counts.
+        masm.inc64(AbsoluteAddress(block.addressOfHitCount()));
+
+        // Collect human readable assembly for the code generated in the block.
+        masm.setPrinter(&printer);
+
+        return true;
+    }
+
+    void visitInstruction(LInstruction *ins)
+    {
+        // Prefix stream of assembly instructions with their LIR instruction
+        // name and any associated high level info.
+        if (const char *extra = ins->extraName())
+            printer.printf("[%s:%s]\n", ins->opName(), extra);
+        else
+            printer.printf("[%s]\n", ins->opName());
+    }
+
+    ~ScriptCountBlockState()
+    {
+        masm.setPrinter(nullptr);
+
+        block.setCode(printer.string());
+    }
+};
+
+#ifdef DEBUG
+bool
+CodeGenerator::branchIfInvalidated(Register temp, Label *invalidated)
+{
+    CodeOffsetLabel label = masm.movWithPatch(ImmWord(uintptr_t(-1)), temp);
+    if (!ionScriptLabels_.append(label))
+        return false;
+
+    // If IonScript::refcount != 0, the script has been invalidated.
+    masm.branch32(Assembler::NotEqual,
+                  Address(temp, IonScript::offsetOfRefcount()),
+                  Imm32(0),
+                  invalidated);
+    return true;
+}
+
+bool
+CodeGenerator::emitObjectOrStringResultChecks(LInstruction *lir, MDefinition *mir)
+{
+    if (lir->numDefs() == 0)
+        return true;
+
+    JS_ASSERT(lir->numDefs() == 1);
+    Register output = ToRegister(lir->getDef(0));
+
+    GeneralRegisterSet regs(GeneralRegisterSet::All());
+    regs.take(output);
+
+    Register temp = regs.takeAny();
+    masm.push(temp);
+
+    // Don't check if the script has been invalidated. In that case invalid
+    // types are expected (until we reach the OsiPoint and bailout).
+    Label done;
+    if (!branchIfInvalidated(temp, &done))
+        return false;
+
+    if (mir->type() == MIRType_Object &&
+        mir->resultTypeSet() &&
+        !mir->resultTypeSet()->unknownObject())
+    {
+        // We have a result TypeSet, assert this object is in it.
+        Label miss, ok;
+        if (mir->resultTypeSet()->getObjectCount() > 0)
+            masm.guardObjectType(output, mir->resultTypeSet(), temp, &miss);
+        else
+            masm.jump(&miss);
+        masm.jump(&ok);
+
+        masm.bind(&miss);
+        masm.assumeUnreachable("MIR instruction returned object with unexpected type");
+
+        masm.bind(&ok);
+    }
+
+    // Check that we have a valid GC pointer.
+    if (gen->info().executionMode() != ParallelExecution) {
+        saveVolatile();
+        masm.setupUnalignedABICall(2, temp);
+        masm.loadJSContext(temp);
+        masm.passABIArg(temp);
+        masm.passABIArg(output);
+        masm.callWithABINoProfiling(mir->type() == MIRType_Object
+                                    ? JS_FUNC_TO_DATA_PTR(void *, AssertValidObjectPtr)
+                                    : JS_FUNC_TO_DATA_PTR(void *, AssertValidStringPtr));
+        restoreVolatile();
+    }
+
+    masm.bind(&done);
+    masm.pop(temp);
+    return true;
+}
+
+bool
+CodeGenerator::emitValueResultChecks(LInstruction *lir, MDefinition *mir)
+{
+    if (lir->numDefs() == 0)
+        return true;
+
+    JS_ASSERT(lir->numDefs() == BOX_PIECES);
+    if (!lir->getDef(0)->output()->isRegister())
+        return true;
+
+    ValueOperand output = ToOutValue(lir);
+
+    GeneralRegisterSet regs(GeneralRegisterSet::All());
+    regs.take(output);
+
+    Register temp1 = regs.takeAny();
+    Register temp2 = regs.takeAny();
+    masm.push(temp1);
+    masm.push(temp2);
+
+    // Don't check if the script has been invalidated. In that case invalid
+    // types are expected (until we reach the OsiPoint and bailout).
+    Label done;
+    if (!branchIfInvalidated(temp1, &done))
+        return false;
+
+    if (mir->resultTypeSet() && !mir->resultTypeSet()->unknown()) {
+        // We have a result TypeSet, assert this value is in it.
+        Label miss, ok;
+        masm.guardTypeSet(output, mir->resultTypeSet(), temp1, &miss);
+        masm.jump(&ok);
+
+        masm.bind(&miss);
+        masm.assumeUnreachable("MIR instruction returned value with unexpected type");
+
+        masm.bind(&ok);
+    }
+
+    // Check that we have a valid GC pointer.
+    if (gen->info().executionMode() != ParallelExecution) {
+        saveVolatile();
+
+        masm.pushValue(output);
+        masm.movePtr(StackPointer, temp1);
+
+        masm.setupUnalignedABICall(2, temp2);
+        masm.loadJSContext(temp2);
+        masm.passABIArg(temp2);
+        masm.passABIArg(temp1);
+        masm.callWithABINoProfiling(JS_FUNC_TO_DATA_PTR(void *, AssertValidValue));
+        masm.popValue(output);
+        restoreVolatile();
+    }
+
+    masm.bind(&done);
+    masm.pop(temp2);
+    masm.pop(temp1);
+    return true;
+}
+
+bool
+CodeGenerator::emitDebugResultChecks(LInstruction *ins)
+{
+    // In debug builds, check that LIR instructions return valid values.
+
+    MDefinition *mir = ins->mirRaw();
+    if (!mir)
+        return true;
+
+    switch (mir->type()) {
+      case MIRType_Object:
+      case MIRType_String:
+        return emitObjectOrStringResultChecks(ins, mir);
+      case MIRType_Value:
+        return emitValueResultChecks(ins, mir);
+      default:
+        return true;
+    }
+}
+#endif
+
+bool
+CodeGenerator::generateBody()
+{
+    IonScriptCounts *counts = maybeCreateScriptCounts();
+
+#if defined(JS_ION_PERF)
+    PerfSpewer *perfSpewer = &perfSpewer_;
+    if (gen->compilingAsmJS())
+        perfSpewer = &gen->perfSpewer();
+#endif
+
+    for (size_t i = 0; i < graph.numBlocks(); i++) {
+        current = graph.getBlock(i);
+        masm.bind(current->label());
+
+        mozilla::Maybe<ScriptCountBlockState> blockCounts;
+        if (counts) {
+            blockCounts.construct(&counts->block(i), &masm);
+            if (!blockCounts.ref().init())
+                return false;
+        }
+
+#if defined(JS_ION_PERF)
+        perfSpewer->startBasicBlock(current->mir(), masm);
+#endif
+
+        for (LInstructionIterator iter = current->begin(); iter != current->end(); iter++) {
+            IonSpewStart(IonSpew_Codegen, "instruction %s", iter->opName());
+#ifdef DEBUG
+            if (const char *extra = iter->extraName())
+                IonSpewCont(IonSpew_Codegen, ":%s", extra);
+#endif
+            IonSpewFin(IonSpew_Codegen);
+
+            if (counts)
+                blockCounts.ref().visitInstruction(*iter);
+
+            if (iter->safepoint() && pushedArgumentSlots_.length()) {
+                if (!markArgumentSlots(iter->safepoint()))
+                    return false;
+            }
+
+#ifdef CHECK_OSIPOINT_REGISTERS
+            if (iter->safepoint())
+                resetOsiPointRegs(iter->safepoint());
+#endif
+
+            if (!callTraceLIR(i, *iter))
+                return false;
+
+            if (!iter->accept(this))
+                return false;
+
+#ifdef DEBUG
+            if (!emitDebugResultChecks(*iter))
+                return false;
+#endif
+        }
+        if (masm.oom())
+            return false;
+
+#if defined(JS_ION_PERF)
+        perfSpewer->endBasicBlock(masm);
+#endif
+    }
+
+    JS_ASSERT(pushedArgumentSlots_.empty());
+    return true;
+}
+
+// Out-of-line object allocation for LNewArray.
+class OutOfLineNewArray : public OutOfLineCodeBase<CodeGenerator>
+{
+    LNewArray *lir_;
+
+  public:
+    OutOfLineNewArray(LNewArray *lir)
+      : lir_(lir)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineNewArray(this);
+    }
+
+    LNewArray *lir() const {
+        return lir_;
+    }
+};
+
+typedef JSObject *(*NewInitArrayFn)(JSContext *, uint32_t, types::TypeObject *);
+static const VMFunction NewInitArrayInfo =
+    FunctionInfo<NewInitArrayFn>(NewInitArray);
+
+bool
+CodeGenerator::visitNewArrayCallVM(LNewArray *lir)
+{
+    JS_ASSERT(gen->info().executionMode() == SequentialExecution);
+
+    Register objReg = ToRegister(lir->output());
+
+    JS_ASSERT(!lir->isCall());
+    saveLive(lir);
+
+    JSObject *templateObject = lir->mir()->templateObject();
+    types::TypeObject *type =
+        templateObject->hasSingletonType() ? nullptr : templateObject->type();
+
+    pushArg(ImmGCPtr(type));
+    pushArg(Imm32(lir->mir()->count()));
+
+    if (!callVM(NewInitArrayInfo, lir))
+        return false;
+
+    if (ReturnReg != objReg)
+        masm.movePtr(ReturnReg, objReg);
+
+    restoreLive(lir);
+
+    return true;
+}
+
+typedef JSObject *(*NewDerivedTypedObjectFn)(JSContext *,
+                                             HandleObject type,
+                                             HandleObject owner,
+                                             int32_t offset);
+static const VMFunction CreateDerivedTypedObjInfo =
+    FunctionInfo<NewDerivedTypedObjectFn>(CreateDerivedTypedObj);
+
+bool
+CodeGenerator::visitNewDerivedTypedObject(LNewDerivedTypedObject *lir)
+{
+    // Not yet made safe for par exec:
+    JS_ASSERT(gen->info().executionMode() == SequentialExecution);
+
+    pushArg(ToRegister(lir->offset()));
+    pushArg(ToRegister(lir->owner()));
+    pushArg(ToRegister(lir->type()));
+    return callVM(CreateDerivedTypedObjInfo, lir);
+}
+
+bool
+CodeGenerator::visitNewSlots(LNewSlots *lir)
+{
+    Register temp1 = ToRegister(lir->temp1());
+    Register temp2 = ToRegister(lir->temp2());
+    Register temp3 = ToRegister(lir->temp3());
+    Register output = ToRegister(lir->output());
+
+    masm.mov(ImmPtr(GetIonContext()->runtime), temp1);
+    masm.mov(ImmWord(lir->mir()->nslots()), temp2);
+
+    masm.setupUnalignedABICall(2, temp3);
+    masm.passABIArg(temp1);
+    masm.passABIArg(temp2);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, NewSlots));
+
+    if (!bailoutTestPtr(Assembler::Zero, output, output, lir->snapshot()))
+        return false;
+
+    return true;
+}
+
+bool CodeGenerator::visitAtan2D(LAtan2D *lir)
+{
+    Register temp = ToRegister(lir->temp());
+    FloatRegister y = ToFloatRegister(lir->y());
+    FloatRegister x = ToFloatRegister(lir->x());
+
+    masm.setupUnalignedABICall(2, temp);
+    masm.passABIArg(y, MoveOp::DOUBLE);
+    masm.passABIArg(x, MoveOp::DOUBLE);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ecmaAtan2), MoveOp::DOUBLE);
+
+    JS_ASSERT(ToFloatRegister(lir->output()) == ReturnFloatReg);
+    return true;
+}
+
+bool CodeGenerator::visitHypot(LHypot *lir)
+{
+    Register temp = ToRegister(lir->temp());
+    FloatRegister x = ToFloatRegister(lir->x());
+    FloatRegister y = ToFloatRegister(lir->y());
+
+    masm.setupUnalignedABICall(2, temp);
+    masm.passABIArg(x, MoveOp::DOUBLE);
+    masm.passABIArg(y, MoveOp::DOUBLE);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ecmaHypot), MoveOp::DOUBLE);
+
+    JS_ASSERT(ToFloatRegister(lir->output()) == ReturnFloatReg);
+    return true;
+}
+
+bool
+CodeGenerator::visitNewArray(LNewArray *lir)
+{
+    JS_ASSERT(gen->info().executionMode() == SequentialExecution);
+    Register objReg = ToRegister(lir->output());
+    Register tempReg = ToRegister(lir->temp());
+    JSObject *templateObject = lir->mir()->templateObject();
+    DebugOnly<uint32_t> count = lir->mir()->count();
+
+    JS_ASSERT(count < JSObject::NELEMENTS_LIMIT);
+
+    if (lir->mir()->shouldUseVM())
+        return visitNewArrayCallVM(lir);
+
+    OutOfLineNewArray *ool = new(alloc()) OutOfLineNewArray(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    masm.newGCThing(objReg, tempReg, templateObject, ool->entry(), lir->mir()->initialHeap());
+    masm.initGCThing(objReg, tempReg, templateObject);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitOutOfLineNewArray(OutOfLineNewArray *ool)
+{
+    if (!visitNewArrayCallVM(ool->lir()))
+        return false;
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+// Out-of-line object allocation for JSOP_NEWOBJECT.
+class OutOfLineNewObject : public OutOfLineCodeBase<CodeGenerator>
+{
+    LNewObject *lir_;
+
+  public:
+    OutOfLineNewObject(LNewObject *lir)
+      : lir_(lir)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineNewObject(this);
+    }
+
+    LNewObject *lir() const {
+        return lir_;
+    }
+};
+
+typedef JSObject *(*NewInitObjectFn)(JSContext *, HandleObject);
+static const VMFunction NewInitObjectInfo = FunctionInfo<NewInitObjectFn>(NewInitObject);
+
+typedef JSObject *(*NewInitObjectWithClassPrototypeFn)(JSContext *, HandleObject);
+static const VMFunction NewInitObjectWithClassPrototypeInfo =
+    FunctionInfo<NewInitObjectWithClassPrototypeFn>(NewInitObjectWithClassPrototype);
+
+bool
+CodeGenerator::visitNewObjectVMCall(LNewObject *lir)
+{
+    JS_ASSERT(gen->info().executionMode() == SequentialExecution);
+
+    Register objReg = ToRegister(lir->output());
+
+    JS_ASSERT(!lir->isCall());
+    saveLive(lir);
+
+    pushArg(ImmGCPtr(lir->mir()->templateObject()));
+
+    // If we're making a new object with a class prototype (that is, an object
+    // that derives its class from its prototype instead of being
+    // JSObject::class_'d) from self-hosted code, we need a different init
+    // function.
+    if (lir->mir()->templateObjectIsClassPrototype()) {
+        if (!callVM(NewInitObjectWithClassPrototypeInfo, lir))
+            return false;
+    } else if (!callVM(NewInitObjectInfo, lir)) {
+        return false;
+    }
+
+    if (ReturnReg != objReg)
+        masm.movePtr(ReturnReg, objReg);
+
+    restoreLive(lir);
+    return true;
+}
+
+bool
+CodeGenerator::visitNewObject(LNewObject *lir)
+{
+    JS_ASSERT(gen->info().executionMode() == SequentialExecution);
+    Register objReg = ToRegister(lir->output());
+    Register tempReg = ToRegister(lir->temp());
+    JSObject *templateObject = lir->mir()->templateObject();
+
+    if (lir->mir()->shouldUseVM())
+        return visitNewObjectVMCall(lir);
+
+    OutOfLineNewObject *ool = new(alloc()) OutOfLineNewObject(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    masm.newGCThing(objReg, tempReg, templateObject, ool->entry(), lir->mir()->initialHeap());
+    masm.initGCThing(objReg, tempReg, templateObject);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitOutOfLineNewObject(OutOfLineNewObject *ool)
+{
+    if (!visitNewObjectVMCall(ool->lir()))
+        return false;
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef js::DeclEnvObject *(*NewDeclEnvObjectFn)(JSContext *, HandleFunction, gc::InitialHeap);
+static const VMFunction NewDeclEnvObjectInfo =
+    FunctionInfo<NewDeclEnvObjectFn>(DeclEnvObject::createTemplateObject);
+
+bool
+CodeGenerator::visitNewDeclEnvObject(LNewDeclEnvObject *lir)
+{
+    Register objReg = ToRegister(lir->output());
+    Register tempReg = ToRegister(lir->temp());
+    JSObject *templateObj = lir->mir()->templateObj();
+    CompileInfo &info = lir->mir()->block()->info();
+
+    // If we have a template object, we can inline call object creation.
+    OutOfLineCode *ool = oolCallVM(NewDeclEnvObjectInfo, lir,
+                                   (ArgList(), ImmGCPtr(info.funMaybeLazy()),
+                                    Imm32(gc::DefaultHeap)),
+                                   StoreRegisterTo(objReg));
+    if (!ool)
+        return false;
+
+    masm.newGCThing(objReg, tempReg, templateObj, ool->entry(), gc::DefaultHeap);
+    masm.initGCThing(objReg, tempReg, templateObj);
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSObject *(*NewCallObjectFn)(JSContext *, HandleShape, HandleTypeObject, HeapSlot *);
+static const VMFunction NewCallObjectInfo =
+    FunctionInfo<NewCallObjectFn>(NewCallObject);
+
+bool
+CodeGenerator::visitNewCallObject(LNewCallObject *lir)
+{
+    Register objReg = ToRegister(lir->output());
+    Register tempReg = ToRegister(lir->temp());
+
+    JSObject *templateObj = lir->mir()->templateObject();
+
+    OutOfLineCode *ool;
+    if (lir->slots()->isRegister()) {
+        ool = oolCallVM(NewCallObjectInfo, lir,
+                        (ArgList(), ImmGCPtr(templateObj->lastProperty()),
+                                    ImmGCPtr(templateObj->type()),
+                                    ToRegister(lir->slots())),
+                        StoreRegisterTo(objReg));
+    } else {
+        ool = oolCallVM(NewCallObjectInfo, lir,
+                        (ArgList(), ImmGCPtr(templateObj->lastProperty()),
+                                    ImmGCPtr(templateObj->type()),
+                                    ImmPtr(nullptr)),
+                        StoreRegisterTo(objReg));
+    }
+    if (!ool)
+        return false;
+
+#ifdef JSGC_GENERATIONAL
+    if (templateObj->hasDynamicSlots()) {
+        // Slot initialization is unbarriered in this case, so we must either
+        // allocate in the nursery or bail if that is not possible.
+        masm.jump(ool->entry());
+    } else
+#endif
+    {
+        // Inline call object creation, using the OOL path only for tricky cases.
+        masm.newGCThing(objReg, tempReg, templateObj, ool->entry(), gc::DefaultHeap);
+        masm.initGCThing(objReg, tempReg, templateObj);
+    }
+
+    if (lir->slots()->isRegister())
+        masm.storePtr(ToRegister(lir->slots()), Address(objReg, JSObject::offsetOfSlots()));
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSObject *(*NewSingletonCallObjectFn)(JSContext *, HandleShape, HeapSlot *);
+static const VMFunction NewSingletonCallObjectInfo =
+    FunctionInfo<NewSingletonCallObjectFn>(NewSingletonCallObject);
+
+bool
+CodeGenerator::visitNewSingletonCallObject(LNewSingletonCallObject *lir)
+{
+    Register objReg = ToRegister(lir->output());
+
+    JSObject *templateObj = lir->mir()->templateObject();
+
+    OutOfLineCode *ool;
+    if (lir->slots()->isRegister()) {
+        ool = oolCallVM(NewSingletonCallObjectInfo, lir,
+                        (ArgList(), ImmGCPtr(templateObj->lastProperty()),
+                                    ToRegister(lir->slots())),
+                        StoreRegisterTo(objReg));
+    } else {
+        ool = oolCallVM(NewSingletonCallObjectInfo, lir,
+                        (ArgList(), ImmGCPtr(templateObj->lastProperty()),
+                                    ImmPtr(nullptr)),
+                        StoreRegisterTo(objReg));
+    }
+    if (!ool)
+        return false;
+
+    // Objects can only be given singleton types in VM calls.  We make the call
+    // out of line to not bloat inline code, even if (naively) this seems like
+    // extra work.
+    masm.jump(ool->entry());
+    masm.bind(ool->rejoin());
+
+    return true;
+}
+
+bool
+CodeGenerator::visitNewCallObjectPar(LNewCallObjectPar *lir)
+{
+    Register resultReg = ToRegister(lir->output());
+    Register cxReg = ToRegister(lir->forkJoinContext());
+    Register tempReg1 = ToRegister(lir->getTemp0());
+    Register tempReg2 = ToRegister(lir->getTemp1());
+    JSObject *templateObj = lir->mir()->templateObj();
+
+    emitAllocateGCThingPar(lir, resultReg, cxReg, tempReg1, tempReg2, templateObj);
+
+    // NB: !lir->slots()->isRegister() implies that there is no slots
+    // array at all, and the memory is already zeroed when copying
+    // from the template object
+
+    if (lir->slots()->isRegister()) {
+        Register slotsReg = ToRegister(lir->slots());
+        JS_ASSERT(slotsReg != resultReg);
+        masm.storePtr(slotsReg, Address(resultReg, JSObject::offsetOfSlots()));
+    }
+
+    return true;
+}
+
+bool
+CodeGenerator::visitNewDenseArrayPar(LNewDenseArrayPar *lir)
+{
+    Register cxReg = ToRegister(lir->forkJoinContext());
+    Register lengthReg = ToRegister(lir->length());
+    Register tempReg0 = ToRegister(lir->getTemp0());
+    Register tempReg1 = ToRegister(lir->getTemp1());
+    Register tempReg2 = ToRegister(lir->getTemp2());
+    JSObject *templateObj = lir->mir()->templateObject();
+
+    // Allocate the array into tempReg2.  Don't use resultReg because it
+    // may alias cxReg etc.
+    emitAllocateGCThingPar(lir, tempReg2, cxReg, tempReg0, tempReg1, templateObj);
+
+    // Invoke a C helper to allocate the elements.  For convenience,
+    // this helper also returns the array back to us, or nullptr, which
+    // obviates the need to preserve the register across the call.  In
+    // reality, we should probably just have the C helper also
+    // *allocate* the array, but that would require that it initialize
+    // the various fields of the object, and I didn't want to
+    // duplicate the code in initGCThing() that already does such an
+    // admirable job.
+    masm.setupUnalignedABICall(3, tempReg0);
+    masm.passABIArg(cxReg);
+    masm.passABIArg(tempReg2);
+    masm.passABIArg(lengthReg);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ExtendArrayPar));
+
+    Register resultReg = ToRegister(lir->output());
+    JS_ASSERT(resultReg == ReturnReg);
+    OutOfLineAbortPar *bail = oolAbortPar(ParallelBailoutOutOfMemory, lir);
+    if (!bail)
+        return false;
+    masm.branchTestPtr(Assembler::Zero, resultReg, resultReg, bail->entry());
+
+    return true;
+}
+
+typedef JSObject *(*NewStringObjectFn)(JSContext *, HandleString);
+static const VMFunction NewStringObjectInfo = FunctionInfo<NewStringObjectFn>(NewStringObject);
+
+bool
+CodeGenerator::visitNewStringObject(LNewStringObject *lir)
+{
+    Register input = ToRegister(lir->input());
+    Register output = ToRegister(lir->output());
+    Register temp = ToRegister(lir->temp());
+
+    StringObject *templateObj = lir->mir()->templateObj();
+
+    OutOfLineCode *ool = oolCallVM(NewStringObjectInfo, lir, (ArgList(), input),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    masm.newGCThing(output, temp, templateObj, ool->entry(), gc::DefaultHeap);
+    masm.initGCThing(output, temp, templateObj);
+
+    masm.loadStringLength(input, temp);
+
+    masm.storeValue(JSVAL_TYPE_STRING, input, Address(output, StringObject::offsetOfPrimitiveValue()));
+    masm.storeValue(JSVAL_TYPE_INT32, temp, Address(output, StringObject::offsetOfLength()));
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitNewPar(LNewPar *lir)
+{
+    Register objReg = ToRegister(lir->output());
+    Register cxReg = ToRegister(lir->forkJoinContext());
+    Register tempReg1 = ToRegister(lir->getTemp0());
+    Register tempReg2 = ToRegister(lir->getTemp1());
+    JSObject *templateObject = lir->mir()->templateObject();
+    emitAllocateGCThingPar(lir, objReg, cxReg, tempReg1, tempReg2, templateObject);
+    return true;
+}
+
+class OutOfLineNewGCThingPar : public OutOfLineCodeBase<CodeGenerator>
+{
+public:
+    LInstruction *lir;
+    gc::AllocKind allocKind;
+    Register objReg;
+    Register cxReg;
+
+    OutOfLineNewGCThingPar(LInstruction *lir, gc::AllocKind allocKind, Register objReg,
+                           Register cxReg)
+      : lir(lir), allocKind(allocKind), objReg(objReg), cxReg(cxReg)
+    {}
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineNewGCThingPar(this);
+    }
+};
+
+bool
+CodeGenerator::emitAllocateGCThingPar(LInstruction *lir, Register objReg, Register cxReg,
+                                      Register tempReg1, Register tempReg2, JSObject *templateObj)
+{
+    gc::AllocKind allocKind = templateObj->tenuredGetAllocKind();
+    OutOfLineNewGCThingPar *ool = new(alloc()) OutOfLineNewGCThingPar(lir, allocKind, objReg, cxReg);
+    if (!ool || !addOutOfLineCode(ool))
+        return false;
+
+    masm.newGCThingPar(objReg, cxReg, tempReg1, tempReg2, templateObj, ool->entry());
+    masm.bind(ool->rejoin());
+    masm.initGCThing(objReg, tempReg1, templateObj);
+    return true;
+}
+
+bool
+CodeGenerator::visitOutOfLineNewGCThingPar(OutOfLineNewGCThingPar *ool)
+{
+    // As a fallback for allocation in par. exec. mode, we invoke the
+    // C helper NewGCThingPar(), which calls into the GC code.  If it
+    // returns nullptr, we bail.  If returns non-nullptr, we rejoin the
+    // original instruction.
+    Register out = ool->objReg;
+
+    saveVolatile(out);
+    masm.setupUnalignedABICall(2, out);
+    masm.passABIArg(ool->cxReg);
+    masm.move32(Imm32(ool->allocKind), out);
+    masm.passABIArg(out);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, NewGCThingPar));
+    masm.storeCallResult(out);
+    restoreVolatile(out);
+
+    OutOfLineAbortPar *bail = oolAbortPar(ParallelBailoutOutOfMemory, ool->lir);
+    if (!bail)
+        return false;
+    masm.branchTestPtr(Assembler::Zero, out, out, bail->entry());
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitAbortPar(LAbortPar *lir)
+{
+    OutOfLineAbortPar *bail = oolAbortPar(ParallelBailoutUnsupported, lir);
+    if (!bail)
+        return false;
+    masm.jump(bail->entry());
+    return true;
+}
+
+typedef bool(*InitElemFn)(JSContext *cx, HandleObject obj,
+                          HandleValue id, HandleValue value);
+static const VMFunction InitElemInfo =
+    FunctionInfo<InitElemFn>(InitElemOperation);
+
+bool
+CodeGenerator::visitInitElem(LInitElem *lir)
+{
+    Register objReg = ToRegister(lir->getObject());
+
+    pushArg(ToValue(lir, LInitElem::ValueIndex));
+    pushArg(ToValue(lir, LInitElem::IdIndex));
+    pushArg(objReg);
+
+    return callVM(InitElemInfo, lir);
+}
+
+typedef bool (*InitElemGetterSetterFn)(JSContext *, jsbytecode *, HandleObject, HandleValue,
+                                       HandleObject);
+static const VMFunction InitElemGetterSetterInfo =
+    FunctionInfo<InitElemGetterSetterFn>(InitGetterSetterOperation);
+
+bool
+CodeGenerator::visitInitElemGetterSetter(LInitElemGetterSetter *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register value = ToRegister(lir->value());
+
+    pushArg(value);
+    pushArg(ToValue(lir, LInitElemGetterSetter::IdIndex));
+    pushArg(obj);
+    pushArg(ImmPtr(lir->mir()->resumePoint()->pc()));
+
+    return callVM(InitElemGetterSetterInfo, lir);
+}
+
+typedef bool(*MutatePrototypeFn)(JSContext *cx, HandleObject obj, HandleValue value);
+static const VMFunction MutatePrototypeInfo =
+    FunctionInfo<MutatePrototypeFn>(MutatePrototype);
+
+bool
+CodeGenerator::visitMutateProto(LMutateProto *lir)
+{
+    Register objReg = ToRegister(lir->getObject());
+
+    pushArg(ToValue(lir, LMutateProto::ValueIndex));
+    pushArg(objReg);
+
+    return callVM(MutatePrototypeInfo, lir);
+}
+
+typedef bool(*InitPropFn)(JSContext *cx, HandleObject obj,
+                          HandlePropertyName name, HandleValue value);
+static const VMFunction InitPropInfo =
+    FunctionInfo<InitPropFn>(InitProp);
+
+bool
+CodeGenerator::visitInitProp(LInitProp *lir)
+{
+    Register objReg = ToRegister(lir->getObject());
+
+    pushArg(ToValue(lir, LInitProp::ValueIndex));
+    pushArg(ImmGCPtr(lir->mir()->propertyName()));
+    pushArg(objReg);
+
+    return callVM(InitPropInfo, lir);
+}
+
+typedef bool(*InitPropGetterSetterFn)(JSContext *, jsbytecode *, HandleObject, HandlePropertyName,
+                                      HandleObject);
+static const VMFunction InitPropGetterSetterInfo =
+    FunctionInfo<InitPropGetterSetterFn>(InitGetterSetterOperation);
+
+bool
+CodeGenerator::visitInitPropGetterSetter(LInitPropGetterSetter *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register value = ToRegister(lir->value());
+
+    pushArg(value);
+    pushArg(ImmGCPtr(lir->mir()->name()));
+    pushArg(obj);
+    pushArg(ImmPtr(lir->mir()->resumePoint()->pc()));
+
+    return callVM(InitPropGetterSetterInfo, lir);
+}
+
+typedef bool (*CreateThisFn)(JSContext *cx, HandleObject callee, MutableHandleValue rval);
+static const VMFunction CreateThisInfoCodeGen = FunctionInfo<CreateThisFn>(CreateThis);
+
+bool
+CodeGenerator::visitCreateThis(LCreateThis *lir)
+{
+    const LAllocation *callee = lir->getCallee();
+
+    if (callee->isConstant())
+        pushArg(ImmGCPtr(&callee->toConstant()->toObject()));
+    else
+        pushArg(ToRegister(callee));
+
+    return callVM(CreateThisInfoCodeGen, lir);
+}
+
+static JSObject *
+CreateThisForFunctionWithProtoWrapper(JSContext *cx, js::HandleObject callee, JSObject *proto)
+{
+    return CreateThisForFunctionWithProto(cx, callee, proto);
+}
+
+typedef JSObject *(*CreateThisWithProtoFn)(JSContext *cx, HandleObject callee, JSObject *proto);
+static const VMFunction CreateThisWithProtoInfo =
+FunctionInfo<CreateThisWithProtoFn>(CreateThisForFunctionWithProtoWrapper);
+
+bool
+CodeGenerator::visitCreateThisWithProto(LCreateThisWithProto *lir)
+{
+    const LAllocation *callee = lir->getCallee();
+    const LAllocation *proto = lir->getPrototype();
+
+    if (proto->isConstant())
+        pushArg(ImmGCPtr(&proto->toConstant()->toObject()));
+    else
+        pushArg(ToRegister(proto));
+
+    if (callee->isConstant())
+        pushArg(ImmGCPtr(&callee->toConstant()->toObject()));
+    else
+        pushArg(ToRegister(callee));
+
+    return callVM(CreateThisWithProtoInfo, lir);
+}
+
+typedef JSObject *(*NewGCObjectFn)(JSContext *cx, gc::AllocKind allocKind,
+                                   gc::InitialHeap initialHeap);
+static const VMFunction NewGCObjectInfo =
+    FunctionInfo<NewGCObjectFn>(js::jit::NewGCObject);
+
+bool
+CodeGenerator::visitCreateThisWithTemplate(LCreateThisWithTemplate *lir)
+{
+    JSObject *templateObject = lir->mir()->templateObject();
+    gc::AllocKind allocKind = templateObject->tenuredGetAllocKind();
+    gc::InitialHeap initialHeap = lir->mir()->initialHeap();
+    Register objReg = ToRegister(lir->output());
+    Register tempReg = ToRegister(lir->temp());
+
+    OutOfLineCode *ool = oolCallVM(NewGCObjectInfo, lir,
+                                   (ArgList(), Imm32(allocKind), Imm32(initialHeap)),
+                                   StoreRegisterTo(objReg));
+    if (!ool)
+        return false;
+
+    // Allocate. If the FreeList is empty, call to VM, which may GC.
+    masm.newGCThing(objReg, tempReg, templateObject, ool->entry(), lir->mir()->initialHeap());
+
+    // Initialize based on the templateObject.
+    masm.bind(ool->rejoin());
+    masm.initGCThing(objReg, tempReg, templateObject);
+
+    return true;
+}
+
+typedef JSObject *(*NewIonArgumentsObjectFn)(JSContext *cx, IonJSFrameLayout *frame, HandleObject);
+static const VMFunction NewIonArgumentsObjectInfo =
+    FunctionInfo<NewIonArgumentsObjectFn>((NewIonArgumentsObjectFn) ArgumentsObject::createForIon);
+
+bool
+CodeGenerator::visitCreateArgumentsObject(LCreateArgumentsObject *lir)
+{
+    // This should be getting constructed in the first block only, and not any OSR entry blocks.
+    JS_ASSERT(lir->mir()->block()->id() == 0);
+
+    const LAllocation *callObj = lir->getCallObject();
+    Register temp = ToRegister(lir->getTemp(0));
+
+    masm.movePtr(StackPointer, temp);
+    masm.addPtr(Imm32(frameSize()), temp);
+
+    pushArg(ToRegister(callObj));
+    pushArg(temp);
+    return callVM(NewIonArgumentsObjectInfo, lir);
+}
+
+bool
+CodeGenerator::visitGetArgumentsObjectArg(LGetArgumentsObjectArg *lir)
+{
+    Register temp = ToRegister(lir->getTemp(0));
+    Register argsObj = ToRegister(lir->getArgsObject());
+    ValueOperand out = ToOutValue(lir);
+
+    masm.loadPrivate(Address(argsObj, ArgumentsObject::getDataSlotOffset()), temp);
+    Address argAddr(temp, ArgumentsData::offsetOfArgs() + lir->mir()->argno() * sizeof(Value));
+    masm.loadValue(argAddr, out);
+#ifdef DEBUG
+    Label success;
+    masm.branchTestMagic(Assembler::NotEqual, out, &success);
+    masm.assumeUnreachable("Result from ArgumentObject shouldn't be JSVAL_TYPE_MAGIC.");
+    masm.bind(&success);
+#endif
+    return true;
+}
+
+bool
+CodeGenerator::visitSetArgumentsObjectArg(LSetArgumentsObjectArg *lir)
+{
+    Register temp = ToRegister(lir->getTemp(0));
+    Register argsObj = ToRegister(lir->getArgsObject());
+    ValueOperand value = ToValue(lir, LSetArgumentsObjectArg::ValueIndex);
+
+    masm.loadPrivate(Address(argsObj, ArgumentsObject::getDataSlotOffset()), temp);
+    Address argAddr(temp, ArgumentsData::offsetOfArgs() + lir->mir()->argno() * sizeof(Value));
+    emitPreBarrier(argAddr, MIRType_Value);
+#ifdef DEBUG
+    Label success;
+    masm.branchTestMagic(Assembler::NotEqual, argAddr, &success);
+    masm.assumeUnreachable("Result in ArgumentObject shouldn't be JSVAL_TYPE_MAGIC.");
+    masm.bind(&success);
+#endif
+    masm.storeValue(value, argAddr);
+    return true;
+}
+
+bool
+CodeGenerator::visitReturnFromCtor(LReturnFromCtor *lir)
+{
+    ValueOperand value = ToValue(lir, LReturnFromCtor::ValueIndex);
+    Register obj = ToRegister(lir->getObject());
+    Register output = ToRegister(lir->output());
+
+    Label valueIsObject, end;
+
+    masm.branchTestObject(Assembler::Equal, value, &valueIsObject);
+
+    // Value is not an object. Return that other object.
+    masm.movePtr(obj, output);
+    masm.jump(&end);
+
+    // Value is an object. Return unbox(Value).
+    masm.bind(&valueIsObject);
+    Register payload = masm.extractObject(value, output);
+    if (payload != output)
+        masm.movePtr(payload, output);
+
+    masm.bind(&end);
+    return true;
+}
+
+typedef JSObject *(*BoxNonStrictThisFn)(JSContext *, HandleValue);
+static const VMFunction BoxNonStrictThisInfo = FunctionInfo<BoxNonStrictThisFn>(BoxNonStrictThis);
+
+bool
+CodeGenerator::visitComputeThis(LComputeThis *lir)
+{
+    ValueOperand value = ToValue(lir, LComputeThis::ValueIndex);
+    Register output = ToRegister(lir->output());
+
+    OutOfLineCode *ool = oolCallVM(BoxNonStrictThisInfo, lir, (ArgList(), value),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    masm.branchTestObject(Assembler::NotEqual, value, ool->entry());
+    masm.unboxObject(value, output);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitLoadArrowThis(LLoadArrowThis *lir)
+{
+    Register callee = ToRegister(lir->callee());
+    ValueOperand output = ToOutValue(lir);
+    masm.loadValue(Address(callee, FunctionExtended::offsetOfArrowThisSlot()), output);
+    return true;
+}
+
+bool
+CodeGenerator::visitArrayLength(LArrayLength *lir)
+{
+    Address length(ToRegister(lir->elements()), ObjectElements::offsetOfLength());
+    masm.load32(length, ToRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitSetArrayLength(LSetArrayLength *lir)
+{
+    Address length(ToRegister(lir->elements()), ObjectElements::offsetOfLength());
+    Int32Key newLength = ToInt32Key(lir->index());
+
+    masm.bumpKey(&newLength, 1);
+    masm.storeKey(newLength, length);
+    // Restore register value if it is used/captured after.
+    masm.bumpKey(&newLength, -1);
+    return true;
+}
+
+bool
+CodeGenerator::visitTypedArrayLength(LTypedArrayLength *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register out = ToRegister(lir->output());
+    masm.unboxInt32(Address(obj, TypedArrayObject::lengthOffset()), out);
+    return true;
+}
+
+bool
+CodeGenerator::visitTypedArrayElements(LTypedArrayElements *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register out = ToRegister(lir->output());
+    masm.loadPtr(Address(obj, TypedArrayObject::dataOffset()), out);
+    return true;
+}
+
+bool
+CodeGenerator::visitNeuterCheck(LNeuterCheck *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register temp = ToRegister(lir->temp());
+
+    masm.extractObject(Address(obj, TypedObject::offsetOfOwnerSlot()), temp);
+    masm.unboxInt32(Address(temp, ArrayBufferObject::flagsOffset()), temp);
+
+    Imm32 flag(ArrayBufferObject::neuteredFlag());
+    if (!bailoutTest32(Assembler::NonZero, temp, flag, lir->snapshot()))
+        return false;
+
+    return true;
+}
+
+bool
+CodeGenerator::visitTypedObjectElements(LTypedObjectElements *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register out = ToRegister(lir->output());
+    masm.loadPtr(Address(obj, TypedObject::offsetOfDataSlot()), out);
+    return true;
+}
+
+bool
+CodeGenerator::visitSetTypedObjectOffset(LSetTypedObjectOffset *lir)
+{
+    Register object = ToRegister(lir->object());
+    Register offset = ToRegister(lir->offset());
+    Register temp0 = ToRegister(lir->temp0());
+
+    // `offset` is an absolute offset into the base buffer. One way
+    // to implement this instruction would be load the base address
+    // from the buffer and add `offset`. But that'd be an extra load.
+    // We can instead load the current base pointer and current
+    // offset, compute the difference with `offset`, and then adjust
+    // the current base pointer. This is two loads but to adjacent
+    // fields in the same object, which should come in the same cache
+    // line.
+    //
+    // The C code I would probably write is the following:
+    //
+    // void SetTypedObjectOffset(TypedObject *obj, int32_t offset) {
+    //     int32_t temp0 = obj->byteOffset;
+    //     obj->pointer = obj->pointer - temp0 + offset;
+    //     obj->byteOffset = offset;
+    // }
+    //
+    // But what we actually compute is more like this, because it
+    // saves us a temporary to do it this way:
+    //
+    // void SetTypedObjectOffset(TypedObject *obj, int32_t offset) {
+    //     int32_t temp0 = obj->byteOffset;
+    //     obj->pointer = obj->pointer - (temp0 - offset);
+    //     obj->byteOffset = offset;
+    // }
+
+    // temp0 = typedObj->byteOffset;
+    masm.unboxInt32(Address(object, TypedObject::offsetOfByteOffsetSlot()), temp0);
+
+    // temp0 -= offset;
+    masm.subPtr(offset, temp0);
+
+    // obj->pointer -= temp0;
+    masm.subPtr(temp0, Address(object, TypedObject::offsetOfDataSlot()));
+
+    // obj->byteOffset = offset;
+    masm.storeValue(JSVAL_TYPE_INT32, offset,
+                    Address(object, TypedObject::offsetOfByteOffsetSlot()));
+
+    return true;
+}
+
+bool
+CodeGenerator::visitStringLength(LStringLength *lir)
+{
+    Register input = ToRegister(lir->string());
+    Register output = ToRegister(lir->output());
+
+    masm.loadStringLength(input, output);
+    return true;
+}
+
+bool
+CodeGenerator::visitMinMaxI(LMinMaxI *ins)
+{
+    Register first = ToRegister(ins->first());
+    Register output = ToRegister(ins->output());
+
+    JS_ASSERT(first == output);
+
+    Label done;
+    Assembler::Condition cond = ins->mir()->isMax()
+                                ? Assembler::GreaterThan
+                                : Assembler::LessThan;
+
+    if (ins->second()->isConstant()) {
+        masm.branch32(cond, first, Imm32(ToInt32(ins->second())), &done);
+        masm.move32(Imm32(ToInt32(ins->second())), output);
+    } else {
+        masm.branch32(cond, first, ToRegister(ins->second()), &done);
+        masm.move32(ToRegister(ins->second()), output);
+    }
+
+    masm.bind(&done);
+    return true;
+}
+
+bool
+CodeGenerator::visitAbsI(LAbsI *ins)
+{
+    Register input = ToRegister(ins->input());
+    Label positive;
+
+    JS_ASSERT(input == ToRegister(ins->output()));
+    masm.branchTest32(Assembler::NotSigned, input, input, &positive);
+    masm.neg32(input);
+#ifdef JS_CODEGEN_MIPS
+    LSnapshot *snapshot = ins->snapshot();
+    if (snapshot && !bailoutCmp32(Assembler::Equal, input, Imm32(INT32_MIN), snapshot))
+        return false;
+#else
+    if (ins->snapshot() && !bailoutIf(Assembler::Overflow, ins->snapshot()))
+        return false;
+#endif
+    masm.bind(&positive);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitPowI(LPowI *ins)
+{
+    FloatRegister value = ToFloatRegister(ins->value());
+    Register power = ToRegister(ins->power());
+    Register temp = ToRegister(ins->temp());
+
+    JS_ASSERT(power != temp);
+
+    // In all implementations, setupUnalignedABICall() relinquishes use of
+    // its scratch register. We can therefore save an input register by
+    // reusing the scratch register to pass constants to callWithABI.
+    masm.setupUnalignedABICall(2, temp);
+    masm.passABIArg(value, MoveOp::DOUBLE);
+    masm.passABIArg(power);
+
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, js::powi), MoveOp::DOUBLE);
+    JS_ASSERT(ToFloatRegister(ins->output()) == ReturnFloatReg);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitPowD(LPowD *ins)
+{
+    FloatRegister value = ToFloatRegister(ins->value());
+    FloatRegister power = ToFloatRegister(ins->power());
+    Register temp = ToRegister(ins->temp());
+
+    masm.setupUnalignedABICall(2, temp);
+    masm.passABIArg(value, MoveOp::DOUBLE);
+    masm.passABIArg(power, MoveOp::DOUBLE);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ecmaPow), MoveOp::DOUBLE);
+
+    JS_ASSERT(ToFloatRegister(ins->output()) == ReturnFloatReg);
+    return true;
+}
+
+bool
+CodeGenerator::visitRandom(LRandom *ins)
+{
+    Register temp = ToRegister(ins->temp());
+    Register temp2 = ToRegister(ins->temp2());
+
+    masm.loadJSContext(temp);
+
+    masm.setupUnalignedABICall(1, temp2);
+    masm.passABIArg(temp);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, math_random_no_outparam), MoveOp::DOUBLE);
+
+    JS_ASSERT(ToFloatRegister(ins->output()) == ReturnFloatReg);
+    return true;
+}
+
+bool
+CodeGenerator::visitMathFunctionD(LMathFunctionD *ins)
+{
+    Register temp = ToRegister(ins->temp());
+    FloatRegister input = ToFloatRegister(ins->input());
+    JS_ASSERT(ToFloatRegister(ins->output()) == ReturnFloatReg);
+
+    const MathCache *mathCache = ins->mir()->cache();
+
+    masm.setupUnalignedABICall(mathCache ? 2 : 1, temp);
+    if (mathCache) {
+        masm.movePtr(ImmPtr(mathCache), temp);
+        masm.passABIArg(temp);
+    }
+    masm.passABIArg(input, MoveOp::DOUBLE);
+
+#   define MAYBE_CACHED(fcn) (mathCache ? (void*)fcn ## _impl : (void*)fcn ## _uncached)
+
+    void *funptr = nullptr;
+    switch (ins->mir()->function()) {
+      case MMathFunction::Log:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_log));
+        break;
+      case MMathFunction::Sin:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_sin));
+        break;
+      case MMathFunction::Cos:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_cos));
+        break;
+      case MMathFunction::Exp:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_exp));
+        break;
+      case MMathFunction::Tan:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_tan));
+        break;
+      case MMathFunction::ATan:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_atan));
+        break;
+      case MMathFunction::ASin:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_asin));
+        break;
+      case MMathFunction::ACos:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_acos));
+        break;
+      case MMathFunction::Log10:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_log10));
+        break;
+      case MMathFunction::Log2:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_log2));
+        break;
+      case MMathFunction::Log1P:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_log1p));
+        break;
+      case MMathFunction::ExpM1:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_expm1));
+        break;
+      case MMathFunction::CosH:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_cosh));
+        break;
+      case MMathFunction::SinH:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_sinh));
+        break;
+      case MMathFunction::TanH:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_tanh));
+        break;
+      case MMathFunction::ACosH:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_acosh));
+        break;
+      case MMathFunction::ASinH:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_asinh));
+        break;
+      case MMathFunction::ATanH:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_atanh));
+        break;
+      case MMathFunction::Sign:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_sign));
+        break;
+      case MMathFunction::Trunc:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_trunc));
+        break;
+      case MMathFunction::Cbrt:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, MAYBE_CACHED(js::math_cbrt));
+        break;
+      case MMathFunction::Floor:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, js::math_floor_impl);
+        break;
+      case MMathFunction::Ceil:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, js::math_ceil_impl);
+        break;
+      case MMathFunction::Round:
+        funptr = JS_FUNC_TO_DATA_PTR(void *, js::math_round_impl);
+        break;
+      default:
+        MOZ_ASSUME_UNREACHABLE("Unknown math function");
+    }
+
+#   undef MAYBE_CACHED
+
+    masm.callWithABI(funptr, MoveOp::DOUBLE);
+    return true;
+}
+
+bool
+CodeGenerator::visitMathFunctionF(LMathFunctionF *ins)
+{
+    Register temp = ToRegister(ins->temp());
+    FloatRegister input = ToFloatRegister(ins->input());
+    JS_ASSERT(ToFloatRegister(ins->output()) == ReturnFloatReg);
+
+    masm.setupUnalignedABICall(1, temp);
+    masm.passABIArg(input, MoveOp::FLOAT32);
+
+    void *funptr = nullptr;
+    switch (ins->mir()->function()) {
+      case MMathFunction::Floor: funptr = JS_FUNC_TO_DATA_PTR(void *, floorf);           break;
+      case MMathFunction::Round: funptr = JS_FUNC_TO_DATA_PTR(void *, math_roundf_impl); break;
+      case MMathFunction::Ceil:  funptr = JS_FUNC_TO_DATA_PTR(void *, ceilf);            break;
+      default:
+        MOZ_ASSUME_UNREACHABLE("Unknown or unsupported float32 math function");
+    }
+
+    masm.callWithABI(funptr, MoveOp::FLOAT32);
+    return true;
+}
+
+bool
+CodeGenerator::visitModD(LModD *ins)
+{
+    FloatRegister lhs = ToFloatRegister(ins->lhs());
+    FloatRegister rhs = ToFloatRegister(ins->rhs());
+    Register temp = ToRegister(ins->temp());
+
+    JS_ASSERT(ToFloatRegister(ins->output()) == ReturnFloatReg);
+
+    masm.setupUnalignedABICall(2, temp);
+    masm.passABIArg(lhs, MoveOp::DOUBLE);
+    masm.passABIArg(rhs, MoveOp::DOUBLE);
+
+    if (gen->compilingAsmJS())
+        masm.callWithABI(AsmJSImm_ModD, MoveOp::DOUBLE);
+    else
+        masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, NumberMod), MoveOp::DOUBLE);
+    return true;
+}
+
+typedef bool (*BinaryFn)(JSContext *, MutableHandleValue, MutableHandleValue, MutableHandleValue);
+typedef bool (*BinaryParFn)(ForkJoinContext *, HandleValue, HandleValue, MutableHandleValue);
+
+static const VMFunction AddInfo = FunctionInfo<BinaryFn>(js::AddValues);
+static const VMFunction SubInfo = FunctionInfo<BinaryFn>(js::SubValues);
+static const VMFunction MulInfo = FunctionInfo<BinaryFn>(js::MulValues);
+static const VMFunction DivInfo = FunctionInfo<BinaryFn>(js::DivValues);
+static const VMFunction ModInfo = FunctionInfo<BinaryFn>(js::ModValues);
+static const VMFunctionsModal UrshInfo = VMFunctionsModal(
+    FunctionInfo<BinaryFn>(js::UrshValues),
+    FunctionInfo<BinaryParFn>(UrshValuesPar));
+
+bool
+CodeGenerator::visitBinaryV(LBinaryV *lir)
+{
+    pushArg(ToValue(lir, LBinaryV::RhsInput));
+    pushArg(ToValue(lir, LBinaryV::LhsInput));
+
+    switch (lir->jsop()) {
+      case JSOP_ADD:
+        return callVM(AddInfo, lir);
+
+      case JSOP_SUB:
+        return callVM(SubInfo, lir);
+
+      case JSOP_MUL:
+        return callVM(MulInfo, lir);
+
+      case JSOP_DIV:
+        return callVM(DivInfo, lir);
+
+      case JSOP_MOD:
+        return callVM(ModInfo, lir);
+
+      case JSOP_URSH:
+        return callVM(UrshInfo, lir);
+
+      default:
+        MOZ_ASSUME_UNREACHABLE("Unexpected binary op");
+    }
+}
+
+typedef bool (*StringCompareFn)(JSContext *, HandleString, HandleString, bool *);
+typedef bool (*StringCompareParFn)(ForkJoinContext *, HandleString, HandleString, bool *);
+static const VMFunctionsModal StringsEqualInfo = VMFunctionsModal(
+    FunctionInfo<StringCompareFn>(jit::StringsEqual<true>),
+    FunctionInfo<StringCompareParFn>(jit::StringsEqualPar));
+static const VMFunctionsModal StringsNotEqualInfo = VMFunctionsModal(
+    FunctionInfo<StringCompareFn>(jit::StringsEqual<false>),
+    FunctionInfo<StringCompareParFn>(jit::StringsUnequalPar));
+
+bool
+CodeGenerator::emitCompareS(LInstruction *lir, JSOp op, Register left, Register right,
+                            Register output, Register temp)
+{
+    JS_ASSERT(lir->isCompareS() || lir->isCompareStrictS());
+
+    OutOfLineCode *ool = nullptr;
+
+    if (op == JSOP_EQ || op == JSOP_STRICTEQ) {
+        ool = oolCallVM(StringsEqualInfo, lir, (ArgList(), left, right),  StoreRegisterTo(output));
+    } else {
+        JS_ASSERT(op == JSOP_NE || op == JSOP_STRICTNE);
+        ool = oolCallVM(StringsNotEqualInfo, lir, (ArgList(), left, right), StoreRegisterTo(output));
+    }
+    if (!ool)
+        return false;
+
+    masm.compareStrings(op, left, right, output, temp, ool->entry());
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitCompareStrictS(LCompareStrictS *lir)
+{
+    JSOp op = lir->mir()->jsop();
+    JS_ASSERT(op == JSOP_STRICTEQ || op == JSOP_STRICTNE);
+
+    const ValueOperand leftV = ToValue(lir, LCompareStrictS::Lhs);
+    Register right = ToRegister(lir->right());
+    Register output = ToRegister(lir->output());
+    Register temp = ToRegister(lir->temp());
+    Register tempToUnbox = ToTempUnboxRegister(lir->tempToUnbox());
+
+    Label string, done;
+
+    masm.branchTestString(Assembler::Equal, leftV, &string);
+    masm.move32(Imm32(op == JSOP_STRICTNE), output);
+    masm.jump(&done);
+
+    masm.bind(&string);
+    Register left = masm.extractString(leftV, tempToUnbox);
+    if (!emitCompareS(lir, op, left, right, output, temp))
+        return false;
+
+    masm.bind(&done);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitCompareS(LCompareS *lir)
+{
+    JSOp op = lir->mir()->jsop();
+    Register left = ToRegister(lir->left());
+    Register right = ToRegister(lir->right());
+    Register output = ToRegister(lir->output());
+    Register temp = ToRegister(lir->temp());
+
+    return emitCompareS(lir, op, left, right, output, temp);
+}
+
+typedef bool (*CompareFn)(JSContext *, MutableHandleValue, MutableHandleValue, bool *);
+typedef bool (*CompareParFn)(ForkJoinContext *, MutableHandleValue, MutableHandleValue, bool *);
+static const VMFunctionsModal EqInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::LooselyEqual<true>),
+    FunctionInfo<CompareParFn>(jit::LooselyEqualPar));
+static const VMFunctionsModal NeInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::LooselyEqual<false>),
+    FunctionInfo<CompareParFn>(jit::LooselyUnequalPar));
+static const VMFunctionsModal StrictEqInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::StrictlyEqual<true>),
+    FunctionInfo<CompareParFn>(jit::StrictlyEqualPar));
+static const VMFunctionsModal StrictNeInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::StrictlyEqual<false>),
+    FunctionInfo<CompareParFn>(jit::StrictlyUnequalPar));
+static const VMFunctionsModal LtInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::LessThan),
+    FunctionInfo<CompareParFn>(jit::LessThanPar));
+static const VMFunctionsModal LeInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::LessThanOrEqual),
+    FunctionInfo<CompareParFn>(jit::LessThanOrEqualPar));
+static const VMFunctionsModal GtInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::GreaterThan),
+    FunctionInfo<CompareParFn>(jit::GreaterThanPar));
+static const VMFunctionsModal GeInfo = VMFunctionsModal(
+    FunctionInfo<CompareFn>(jit::GreaterThanOrEqual),
+    FunctionInfo<CompareParFn>(jit::GreaterThanOrEqualPar));
+
+bool
+CodeGenerator::visitCompareVM(LCompareVM *lir)
+{
+    pushArg(ToValue(lir, LBinaryV::RhsInput));
+    pushArg(ToValue(lir, LBinaryV::LhsInput));
+
+    switch (lir->mir()->jsop()) {
+      case JSOP_EQ:
+        return callVM(EqInfo, lir);
+
+      case JSOP_NE:
+        return callVM(NeInfo, lir);
+
+      case JSOP_STRICTEQ:
+        return callVM(StrictEqInfo, lir);
+
+      case JSOP_STRICTNE:
+        return callVM(StrictNeInfo, lir);
+
+      case JSOP_LT:
+        return callVM(LtInfo, lir);
+
+      case JSOP_LE:
+        return callVM(LeInfo, lir);
+
+      case JSOP_GT:
+        return callVM(GtInfo, lir);
+
+      case JSOP_GE:
+        return callVM(GeInfo, lir);
+
+      default:
+        MOZ_ASSUME_UNREACHABLE("Unexpected compare op");
+    }
+}
+
+bool
+CodeGenerator::visitIsNullOrLikeUndefined(LIsNullOrLikeUndefined *lir)
+{
+    JSOp op = lir->mir()->jsop();
+    MCompare::CompareType compareType = lir->mir()->compareType();
+    JS_ASSERT(compareType == MCompare::Compare_Undefined ||
+              compareType == MCompare::Compare_Null);
+
+    const ValueOperand value = ToValue(lir, LIsNullOrLikeUndefined::Value);
+    Register output = ToRegister(lir->output());
+
+    if (op == JSOP_EQ || op == JSOP_NE) {
+        MOZ_ASSERT(lir->mir()->lhs()->type() != MIRType_Object ||
+                   lir->mir()->operandMightEmulateUndefined(),
+                   "Operands which can't emulate undefined should have been folded");
+
+        OutOfLineTestObjectWithLabels *ool = nullptr;
+        Maybe<Label> label1, label2;
+        Label *nullOrLikeUndefined;
+        Label *notNullOrLikeUndefined;
+        if (lir->mir()->operandMightEmulateUndefined()) {
+            ool = new(alloc()) OutOfLineTestObjectWithLabels();
+            if (!addOutOfLineCode(ool))
+                return false;
+            nullOrLikeUndefined = ool->label1();
+            notNullOrLikeUndefined = ool->label2();
+        } else {
+            label1.construct();
+            label2.construct();
+            nullOrLikeUndefined = label1.addr();
+            notNullOrLikeUndefined = label2.addr();
+        }
+
+        Register tag = masm.splitTagForTest(value);
+
+        masm.branchTestNull(Assembler::Equal, tag, nullOrLikeUndefined);
+        masm.branchTestUndefined(Assembler::Equal, tag, nullOrLikeUndefined);
+
+        if (ool) {
+            // Check whether it's a truthy object or a falsy object that emulates
+            // undefined.
+            masm.branchTestObject(Assembler::NotEqual, tag, notNullOrLikeUndefined);
+
+            Register objreg = masm.extractObject(value, ToTempUnboxRegister(lir->tempToUnbox()));
+            branchTestObjectEmulatesUndefined(objreg, nullOrLikeUndefined, notNullOrLikeUndefined,
+                                              ToRegister(lir->temp()), ool);
+            // fall through
+        }
+
+        Label done;
+
+        // It's not null or undefined, and if it's an object it doesn't
+        // emulate undefined, so it's not like undefined.
+        masm.move32(Imm32(op == JSOP_NE), output);
+        masm.jump(&done);
+
+        masm.bind(nullOrLikeUndefined);
+        masm.move32(Imm32(op == JSOP_EQ), output);
+
+        // Both branches meet here.
+        masm.bind(&done);
+        return true;
+    }
+
+    JS_ASSERT(op == JSOP_STRICTEQ || op == JSOP_STRICTNE);
+
+    Assembler::Condition cond = JSOpToCondition(compareType, op);
+    if (compareType == MCompare::Compare_Null)
+        masm.testNullSet(cond, value, output);
+    else
+        masm.testUndefinedSet(cond, value, output);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitIsNullOrLikeUndefinedAndBranch(LIsNullOrLikeUndefinedAndBranch *lir)
+{
+    JSOp op = lir->cmpMir()->jsop();
+    MCompare::CompareType compareType = lir->cmpMir()->compareType();
+    JS_ASSERT(compareType == MCompare::Compare_Undefined ||
+              compareType == MCompare::Compare_Null);
+
+    const ValueOperand value = ToValue(lir, LIsNullOrLikeUndefinedAndBranch::Value);
+
+    if (op == JSOP_EQ || op == JSOP_NE) {
+        MBasicBlock *ifTrue;
+        MBasicBlock *ifFalse;
+
+        if (op == JSOP_EQ) {
+            ifTrue = lir->ifTrue();
+            ifFalse = lir->ifFalse();
+        } else {
+            // Swap branches.
+            ifTrue = lir->ifFalse();
+            ifFalse = lir->ifTrue();
+            op = JSOP_EQ;
+        }
+
+        MOZ_ASSERT(lir->cmpMir()->lhs()->type() != MIRType_Object ||
+                   lir->cmpMir()->operandMightEmulateUndefined(),
+                   "Operands which can't emulate undefined should have been folded");
+
+        OutOfLineTestObject *ool = nullptr;
+        if (lir->cmpMir()->operandMightEmulateUndefined()) {
+            ool = new(alloc()) OutOfLineTestObject();
+            if (!addOutOfLineCode(ool))
+                return false;
+        }
+
+        Register tag = masm.splitTagForTest(value);
+
+        Label *ifTrueLabel = getJumpLabelForBranch(ifTrue);
+        Label *ifFalseLabel = getJumpLabelForBranch(ifFalse);
+
+        masm.branchTestNull(Assembler::Equal, tag, ifTrueLabel);
+        masm.branchTestUndefined(Assembler::Equal, tag, ifTrueLabel);
+
+        if (ool) {
+            masm.branchTestObject(Assembler::NotEqual, tag, ifFalseLabel);
+
+            // Objects that emulate undefined are loosely equal to null/undefined.
+            Register objreg = masm.extractObject(value, ToTempUnboxRegister(lir->tempToUnbox()));
+            Register scratch = ToRegister(lir->temp());
+            testObjectEmulatesUndefined(objreg, ifTrueLabel, ifFalseLabel, scratch, ool);
+        } else {
+            masm.jump(ifFalseLabel);
+        }
+        return true;
+    }
+
+    JS_ASSERT(op == JSOP_STRICTEQ || op == JSOP_STRICTNE);
+
+    Assembler::Condition cond = JSOpToCondition(compareType, op);
+    if (compareType == MCompare::Compare_Null)
+        testNullEmitBranch(cond, value, lir->ifTrue(), lir->ifFalse());
+    else
+        testUndefinedEmitBranch(cond, value, lir->ifTrue(), lir->ifFalse());
+
+    return true;
+}
+
+bool
+CodeGenerator::visitEmulatesUndefined(LEmulatesUndefined *lir)
+{
+    MOZ_ASSERT(lir->mir()->compareType() == MCompare::Compare_Undefined ||
+               lir->mir()->compareType() == MCompare::Compare_Null);
+    MOZ_ASSERT(lir->mir()->lhs()->type() == MIRType_Object);
+    MOZ_ASSERT(lir->mir()->operandMightEmulateUndefined(),
+               "If the object couldn't emulate undefined, this should have been folded.");
+
+    JSOp op = lir->mir()->jsop();
+    MOZ_ASSERT(op == JSOP_EQ || op == JSOP_NE, "Strict equality should have been folded");
+
+    OutOfLineTestObjectWithLabels *ool = new(alloc()) OutOfLineTestObjectWithLabels();
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Label *emulatesUndefined = ool->label1();
+    Label *doesntEmulateUndefined = ool->label2();
+
+    Register objreg = ToRegister(lir->input());
+    Register output = ToRegister(lir->output());
+    branchTestObjectEmulatesUndefined(objreg, emulatesUndefined, doesntEmulateUndefined,
+                                      output, ool);
+
+    Label done;
+
+    masm.move32(Imm32(op == JSOP_NE), output);
+    masm.jump(&done);
+
+    masm.bind(emulatesUndefined);
+    masm.move32(Imm32(op == JSOP_EQ), output);
+    masm.bind(&done);
+    return true;
+}
+
+bool
+CodeGenerator::visitEmulatesUndefinedAndBranch(LEmulatesUndefinedAndBranch *lir)
+{
+    MOZ_ASSERT(lir->cmpMir()->compareType() == MCompare::Compare_Undefined ||
+               lir->cmpMir()->compareType() == MCompare::Compare_Null);
+    MOZ_ASSERT(lir->cmpMir()->operandMightEmulateUndefined(),
+               "Operands which can't emulate undefined should have been folded");
+
+    JSOp op = lir->cmpMir()->jsop();
+    MOZ_ASSERT(op == JSOP_EQ || op == JSOP_NE, "Strict equality should have been folded");
+
+    OutOfLineTestObject *ool = new(alloc()) OutOfLineTestObject();
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Label *equal;
+    Label *unequal;
+
+    {
+        MBasicBlock *ifTrue;
+        MBasicBlock *ifFalse;
+
+        if (op == JSOP_EQ) {
+            ifTrue = lir->ifTrue();
+            ifFalse = lir->ifFalse();
+        } else {
+            // Swap branches.
+            ifTrue = lir->ifFalse();
+            ifFalse = lir->ifTrue();
+            op = JSOP_EQ;
+        }
+
+        equal = getJumpLabelForBranch(ifTrue);
+        unequal = getJumpLabelForBranch(ifFalse);
+    }
+
+    Register objreg = ToRegister(lir->input());
+
+    testObjectEmulatesUndefined(objreg, equal, unequal, ToRegister(lir->temp()), ool);
+    return true;
+}
+
+typedef JSString *(*ConcatStringsFn)(ThreadSafeContext *, HandleString, HandleString);
+typedef JSString *(*ConcatStringsParFn)(ForkJoinContext *, HandleString, HandleString);
+static const VMFunctionsModal ConcatStringsInfo = VMFunctionsModal(
+    FunctionInfo<ConcatStringsFn>(ConcatStrings<CanGC>),
+    FunctionInfo<ConcatStringsParFn>(ConcatStringsPar));
+
+bool
+CodeGenerator::emitConcat(LInstruction *lir, Register lhs, Register rhs, Register output)
+{
+    OutOfLineCode *ool = oolCallVM(ConcatStringsInfo, lir, (ArgList(), lhs, rhs),
+                                   StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    ExecutionMode mode = gen->info().executionMode();
+    JitCode *stringConcatStub = gen->compartment->jitCompartment()->stringConcatStub(mode);
+    masm.call(stringConcatStub);
+    masm.branchTestPtr(Assembler::Zero, output, output, ool->entry());
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitConcat(LConcat *lir)
+{
+    Register lhs = ToRegister(lir->lhs());
+    Register rhs = ToRegister(lir->rhs());
+
+    Register output = ToRegister(lir->output());
+
+    JS_ASSERT(lhs == CallTempReg0);
+    JS_ASSERT(rhs == CallTempReg1);
+    JS_ASSERT(ToRegister(lir->temp1()) == CallTempReg0);
+    JS_ASSERT(ToRegister(lir->temp2()) == CallTempReg1);
+    JS_ASSERT(ToRegister(lir->temp3()) == CallTempReg2);
+    JS_ASSERT(ToRegister(lir->temp4()) == CallTempReg3);
+    JS_ASSERT(ToRegister(lir->temp5()) == CallTempReg4);
+    JS_ASSERT(output == CallTempReg5);
+
+    return emitConcat(lir, lhs, rhs, output);
+}
+
+bool
+CodeGenerator::visitConcatPar(LConcatPar *lir)
+{
+    DebugOnly<Register> cx = ToRegister(lir->forkJoinContext());
+    Register lhs = ToRegister(lir->lhs());
+    Register rhs = ToRegister(lir->rhs());
+    Register output = ToRegister(lir->output());
+
+    JS_ASSERT(lhs == CallTempReg0);
+    JS_ASSERT(rhs == CallTempReg1);
+    JS_ASSERT((Register)cx == CallTempReg4);
+    JS_ASSERT(ToRegister(lir->temp1()) == CallTempReg0);
+    JS_ASSERT(ToRegister(lir->temp2()) == CallTempReg1);
+    JS_ASSERT(ToRegister(lir->temp3()) == CallTempReg2);
+    JS_ASSERT(ToRegister(lir->temp4()) == CallTempReg3);
+    JS_ASSERT(output == CallTempReg5);
+
+    return emitConcat(lir, lhs, rhs, output);
+}
+
+static void
+CopyStringChars(MacroAssembler &masm, Register to, Register from, Register len, Register scratch)
+{
+    // Copy |len| jschars from |from| to |to|. Assumes len > 0 (checked below in
+    // debug builds), and when done |to| must point to the next available char.
+
+#ifdef DEBUG
+    Label ok;
+    masm.branch32(Assembler::GreaterThan, len, Imm32(0), &ok);
+    masm.assumeUnreachable("Length should be greater than 0.");
+    masm.bind(&ok);
+#endif
+
+    JS_STATIC_ASSERT(sizeof(jschar) == 2);
+
+    Label start;
+    masm.bind(&start);
+    masm.load16ZeroExtend(Address(from, 0), scratch);
+    masm.store16(scratch, Address(to, 0));
+    masm.addPtr(Imm32(2), from);
+    masm.addPtr(Imm32(2), to);
+    masm.branchSub32(Assembler::NonZero, Imm32(1), len, &start);
+}
+
+JitCode *
+JitCompartment::generateStringConcatStub(JSContext *cx, ExecutionMode mode)
+{
+    MacroAssembler masm(cx);
+
+    Register lhs = CallTempReg0;
+    Register rhs = CallTempReg1;
+    Register temp1 = CallTempReg2;
+    Register temp2 = CallTempReg3;
+    Register temp3 = CallTempReg4;
+    Register output = CallTempReg5;
+
+    // In parallel execution, we pass in the ForkJoinContext in CallTempReg4, as
+    // by the time we need to use the temp3 we no longer have need of the
+    // cx.
+    Register forkJoinContext = CallTempReg4;
+
+    Label failure, failurePopTemps;
+
+    // If lhs is empty, return rhs.
+    Label leftEmpty;
+    masm.loadStringLength(lhs, temp1);
+    masm.branchTest32(Assembler::Zero, temp1, temp1, &leftEmpty);
+
+    // If rhs is empty, return lhs.
+    Label rightEmpty;
+    masm.loadStringLength(rhs, temp2);
+    masm.branchTest32(Assembler::Zero, temp2, temp2, &rightEmpty);
+
+    masm.add32(temp1, temp2);
+
+    // Check if we can use a JSFatInlineString.
+    Label isFatInline;
+    masm.branch32(Assembler::BelowOrEqual, temp2, Imm32(JSFatInlineString::MAX_FAT_INLINE_LENGTH),
+                  &isFatInline);
+
+    // Ensure result length <= JSString::MAX_LENGTH.
+    masm.branch32(Assembler::Above, temp2, Imm32(JSString::MAX_LENGTH), &failure);
+
+    // Allocate a new rope.
+    switch (mode) {
+      case SequentialExecution:
+        masm.newGCString(output, temp3, &failure);
+        break;
+      case ParallelExecution:
+        masm.push(temp1);
+        masm.push(temp2);
+        masm.newGCStringPar(output, forkJoinContext, temp1, temp2, &failurePopTemps);
+        masm.pop(temp2);
+        masm.pop(temp1);
+        break;
+      default:
+        MOZ_ASSUME_UNREACHABLE("No such execution mode");
+    }
+
+    // Store lengthAndFlags.
+    JS_STATIC_ASSERT(JSString::ROPE_FLAGS == 0);
+    masm.lshiftPtr(Imm32(JSString::LENGTH_SHIFT), temp2);
+    masm.storePtr(temp2, Address(output, JSString::offsetOfLengthAndFlags()));
+
+    // Store left and right nodes.
+    masm.storePtr(lhs, Address(output, JSRope::offsetOfLeft()));
+    masm.storePtr(rhs, Address(output, JSRope::offsetOfRight()));
+    masm.ret();
+
+    masm.bind(&leftEmpty);
+    masm.mov(rhs, output);
+    masm.ret();
+
+    masm.bind(&rightEmpty);
+    masm.mov(lhs, output);
+    masm.ret();
+
+    masm.bind(&isFatInline);
+
+    // State: lhs length in temp1, result length in temp2.
+
+    // Ensure both strings are linear (flags != 0).
+    JS_STATIC_ASSERT(JSString::ROPE_FLAGS == 0);
+    masm.branchTestPtr(Assembler::Zero, Address(lhs, JSString::offsetOfLengthAndFlags()),
+                       Imm32(JSString::FLAGS_MASK), &failure);
+    masm.branchTestPtr(Assembler::Zero, Address(rhs, JSString::offsetOfLengthAndFlags()),
+                       Imm32(JSString::FLAGS_MASK), &failure);
+
+    // Allocate a JSFatInlineString.
+    switch (mode) {
+      case SequentialExecution:
+        masm.newGCFatInlineString(output, temp3, &failure);
+        break;
+      case ParallelExecution:
+        masm.push(temp1);
+        masm.push(temp2);
+        masm.newGCFatInlineStringPar(output, forkJoinContext, temp1, temp2, &failurePopTemps);
+        masm.pop(temp2);
+        masm.pop(temp1);
+        break;
+      default:
+        MOZ_ASSUME_UNREACHABLE("No such execution mode");
+    }
+
+    // Set lengthAndFlags.
+    masm.lshiftPtr(Imm32(JSString::LENGTH_SHIFT), temp2);
+    masm.orPtr(Imm32(JSString::FIXED_FLAGS), temp2);
+    masm.storePtr(temp2, Address(output, JSString::offsetOfLengthAndFlags()));
+
+    // Set chars pointer, keep in temp2 for copy loop below.
+    masm.computeEffectiveAddress(Address(output, JSFatInlineString::offsetOfInlineStorage()), temp2);
+    masm.storePtr(temp2, Address(output, JSFatInlineString::offsetOfChars()));
+
+    {
+        // We use temp3 in this block, which in parallel execution also holds
+        // a live ForkJoinContext pointer. If we are compiling for parallel
+        // execution, be sure to save and restore the ForkJoinContext.
+        if (mode == ParallelExecution)
+            masm.push(temp3);
+
+        // Copy lhs chars. Temp1 still holds the lhs length. Note that this
+        // advances temp2 to point to the next char. Note that this also
+        // repurposes the lhs register.
+        masm.loadPtr(Address(lhs, JSString::offsetOfChars()), lhs);
+        CopyStringChars(masm, temp2, lhs, temp1, temp3);
+
+        // Copy rhs chars.
+        masm.loadStringLength(rhs, temp1);
+        masm.loadPtr(Address(rhs, JSString::offsetOfChars()), rhs);
+        CopyStringChars(masm, temp2, rhs, temp1, temp3);
+
+        if (mode == ParallelExecution)
+            masm.pop(temp3);
+    }
+
+    // Null-terminate.
+    masm.store16(Imm32(0), Address(temp2, 0));
+    masm.ret();
+
+    masm.bind(&failurePopTemps);
+    masm.pop(temp2);
+    masm.pop(temp1);
+
+    masm.bind(&failure);
+    masm.movePtr(ImmPtr(nullptr), output);
+    masm.ret();
+
+    Linker linker(masm);
+    AutoFlushICache afc("StringConcatStub");
+    JitCode *code = linker.newCode<CanGC>(cx, JSC::OTHER_CODE);
+
+#ifdef JS_ION_PERF
+    writePerfSpewerJitCodeProfile(code, "StringConcatStub");
+#endif
+
+    return code;
+}
+
+typedef bool (*CharCodeAtFn)(JSContext *, HandleString, int32_t, uint32_t *);
+static const VMFunction CharCodeAtInfo = FunctionInfo<CharCodeAtFn>(jit::CharCodeAt);
+
+bool
+CodeGenerator::visitCharCodeAt(LCharCodeAt *lir)
+{
+    Register str = ToRegister(lir->str());
+    Register index = ToRegister(lir->index());
+    Register output = ToRegister(lir->output());
+
+    OutOfLineCode *ool = oolCallVM(CharCodeAtInfo, lir, (ArgList(), str, index), StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    Address lengthAndFlagsAddr(str, JSString::offsetOfLengthAndFlags());
+    masm.branchTest32(Assembler::Zero, lengthAndFlagsAddr, Imm32(JSString::FLAGS_MASK), ool->entry());
+
+    // getChars
+    Address charsAddr(str, JSString::offsetOfChars());
+    masm.loadPtr(charsAddr, output);
+    masm.load16ZeroExtend(BaseIndex(output, index, TimesTwo, 0), output);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSFlatString *(*StringFromCharCodeFn)(JSContext *, int32_t);
+static const VMFunction StringFromCharCodeInfo = FunctionInfo<StringFromCharCodeFn>(jit::StringFromCharCode);
+
+bool
+CodeGenerator::visitFromCharCode(LFromCharCode *lir)
+{
+    Register code = ToRegister(lir->code());
+    Register output = ToRegister(lir->output());
+
+    OutOfLineCode *ool = oolCallVM(StringFromCharCodeInfo, lir, (ArgList(), code), StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    // OOL path if code >= UNIT_STATIC_LIMIT.
+    masm.branch32(Assembler::AboveOrEqual, code, Imm32(StaticStrings::UNIT_STATIC_LIMIT),
+                  ool->entry());
+
+    masm.movePtr(ImmPtr(&GetIonContext()->runtime->staticStrings().unitStaticTable), output);
+    masm.loadPtr(BaseIndex(output, code, ScalePointer), output);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef JSObject *(*StringSplitFn)(JSContext *, HandleTypeObject, HandleString, HandleString);
+static const VMFunction StringSplitInfo = FunctionInfo<StringSplitFn>(js::str_split_string);
+
+bool
+CodeGenerator::visitStringSplit(LStringSplit *lir)
+{
+    pushArg(ToRegister(lir->separator()));
+    pushArg(ToRegister(lir->string()));
+    pushArg(ImmGCPtr(lir->mir()->typeObject()));
+
+    return callVM(StringSplitInfo, lir);
+}
+
+bool
+CodeGenerator::visitInitializedLength(LInitializedLength *lir)
+{
+    Address initLength(ToRegister(lir->elements()), ObjectElements::offsetOfInitializedLength());
+    masm.load32(initLength, ToRegister(lir->output()));
+    return true;
+}
+
+bool
+CodeGenerator::visitSetInitializedLength(LSetInitializedLength *lir)
+{
+    Address initLength(ToRegister(lir->elements()), ObjectElements::offsetOfInitializedLength());
+    Int32Key index = ToInt32Key(lir->index());
+
+    masm.bumpKey(&index, 1);
+    masm.storeKey(index, initLength);
+    // Restore register value if it is used/captured after.
+    masm.bumpKey(&index, -1);
+    return true;
+}
+
+bool
+CodeGenerator::visitNotO(LNotO *lir)
+{
+    MOZ_ASSERT(lir->mir()->operandMightEmulateUndefined(),
+               "This should be constant-folded if the object can't emulate undefined.");
+
+    OutOfLineTestObjectWithLabels *ool = new(alloc()) OutOfLineTestObjectWithLabels();
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Label *ifEmulatesUndefined = ool->label1();
+    Label *ifDoesntEmulateUndefined = ool->label2();
+
+    Register objreg = ToRegister(lir->input());
+    Register output = ToRegister(lir->output());
+    branchTestObjectEmulatesUndefined(objreg, ifEmulatesUndefined, ifDoesntEmulateUndefined,
+                                      output, ool);
+    // fall through
+
+    Label join;
+
+    masm.move32(Imm32(0), output);
+    masm.jump(&join);
+
+    masm.bind(ifEmulatesUndefined);
+    masm.move32(Imm32(1), output);
+
+    masm.bind(&join);
+    return true;
+}
+
+bool
+CodeGenerator::visitNotV(LNotV *lir)
+{
+    Maybe<Label> ifTruthyLabel, ifFalsyLabel;
+    Label *ifTruthy;
+    Label *ifFalsy;
+
+    OutOfLineTestObjectWithLabels *ool = nullptr;
+    if (lir->mir()->operandMightEmulateUndefined()) {
+        ool = new(alloc()) OutOfLineTestObjectWithLabels();
+        if (!addOutOfLineCode(ool))
+            return false;
+        ifTruthy = ool->label1();
+        ifFalsy = ool->label2();
+    } else {
+        ifTruthyLabel.construct();
+        ifFalsyLabel.construct();
+        ifTruthy = ifTruthyLabel.addr();
+        ifFalsy = ifFalsyLabel.addr();
+    }
+
+    testValueTruthyKernel(ToValue(lir, LNotV::Input), lir->temp1(), lir->temp2(),
+                          ToFloatRegister(lir->tempFloat()),
+                          ifTruthy, ifFalsy, ool);
+
+    Label join;
+    Register output = ToRegister(lir->output());
+
+    // Note that the testValueTruthyKernel call above may choose to fall through
+    // to ifTruthy instead of branching there.
+    masm.bind(ifTruthy);
+    masm.move32(Imm32(0), output);
+    masm.jump(&join);
+
+    masm.bind(ifFalsy);
+    masm.move32(Imm32(1), output);
+
+    // both branches meet here.
+    masm.bind(&join);
+    return true;
+}
+
+bool
+CodeGenerator::visitBoundsCheck(LBoundsCheck *lir)
+{
+    if (lir->index()->isConstant()) {
+        // Use uint32 so that the comparison is unsigned.
+        uint32_t index = ToInt32(lir->index());
+        if (lir->length()->isConstant()) {
+            uint32_t length = ToInt32(lir->length());
+            if (index < length)
+                return true;
+            return bailout(lir->snapshot());
+        }
+        return bailoutCmp32(Assembler::BelowOrEqual, ToOperand(lir->length()), Imm32(index),
+                            lir->snapshot());
+    }
+    if (lir->length()->isConstant()) {
+        return bailoutCmp32(Assembler::AboveOrEqual, ToRegister(lir->index()),
+                             Imm32(ToInt32(lir->length())), lir->snapshot());
+    }
+    return bailoutCmp32(Assembler::BelowOrEqual, ToOperand(lir->length()),
+                        ToRegister(lir->index()), lir->snapshot());
+}
+
+bool
+CodeGenerator::visitBoundsCheckRange(LBoundsCheckRange *lir)
+{
+    int32_t min = lir->mir()->minimum();
+    int32_t max = lir->mir()->maximum();
+    JS_ASSERT(max >= min);
+
+    Register temp = ToRegister(lir->getTemp(0));
+    if (lir->index()->isConstant()) {
+        int32_t nmin, nmax;
+        int32_t index = ToInt32(lir->index());
+        if (SafeAdd(index, min, &nmin) && SafeAdd(index, max, &nmax) && nmin >= 0) {
+            return bailoutCmp32(Assembler::BelowOrEqual, ToOperand(lir->length()), Imm32(nmax),
+                                lir->snapshot());
+        }
+        masm.mov(ImmWord(index), temp);
+    } else {
+        masm.mov(ToRegister(lir->index()), temp);
+    }
+
+    // If the minimum and maximum differ then do an underflow check first.
+    // If the two are the same then doing an unsigned comparison on the
+    // length will also catch a negative index.
+    if (min != max) {
+        if (min != 0) {
+            Label bail;
+            masm.branchAdd32(Assembler::Overflow, Imm32(min), temp, &bail);
+            if (!bailoutFrom(&bail, lir->snapshot()))
+                return false;
+        }
+
+        if (!bailoutCmp32(Assembler::LessThan, temp, Imm32(0), lir->snapshot()))
+            return false;
+
+        if (min != 0) {
+            int32_t diff;
+            if (SafeSub(max, min, &diff))
+                max = diff;
+            else
+                masm.sub32(Imm32(min), temp);
+        }
+    }
+
+    // Compute the maximum possible index. No overflow check is needed when
+    // max > 0. We can only wraparound to a negative number, which will test as
+    // larger than all nonnegative numbers in the unsigned comparison, and the
+    // length is required to be nonnegative (else testing a negative length
+    // would succeed on any nonnegative index).
+    if (max != 0) {
+        if (max < 0) {
+            Label bail;
+            masm.branchAdd32(Assembler::Overflow, Imm32(max), temp, &bail);
+            if (!bailoutFrom(&bail, lir->snapshot()))
+                return false;
+        } else {
+            masm.add32(Imm32(max), temp);
+        }
+    }
+
+    return bailoutCmp32(Assembler::BelowOrEqual, ToOperand(lir->length()), temp, lir->snapshot());
+}
+
+bool
+CodeGenerator::visitBoundsCheckLower(LBoundsCheckLower *lir)
+{
+    int32_t min = lir->mir()->minimum();
+    return bailoutCmp32(Assembler::LessThan, ToRegister(lir->index()), Imm32(min),
+                        lir->snapshot());
+}
+
+class OutOfLineStoreElementHole : public OutOfLineCodeBase<CodeGenerator>
+{
+    LInstruction *ins_;
+    Label rejoinStore_;
+
+  public:
+    OutOfLineStoreElementHole(LInstruction *ins)
+      : ins_(ins)
+    {
+        JS_ASSERT(ins->isStoreElementHoleV() || ins->isStoreElementHoleT());
+    }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineStoreElementHole(this);
+    }
+    LInstruction *ins() const {
+        return ins_;
+    }
+    Label *rejoinStore() {
+        return &rejoinStore_;
+    }
+};
+
+bool
+CodeGenerator::emitStoreHoleCheck(Register elements, const LAllocation *index, LSnapshot *snapshot)
+{
+    Label bail;
+    if (index->isConstant()) {
+        masm.branchTestMagic(Assembler::Equal,
+                             Address(elements, ToInt32(index) * sizeof(js::Value)), &bail);
+    } else {
+        masm.branchTestMagic(Assembler::Equal,
+                             BaseIndex(elements, ToRegister(index), TimesEight), &bail);
+    }
+    return bailoutFrom(&bail, snapshot);
+}
+
+bool
+CodeGenerator::visitStoreElementT(LStoreElementT *store)
+{
+    Register elements = ToRegister(store->elements());
+    const LAllocation *index = store->index();
+
+    if (store->mir()->needsBarrier())
+       emitPreBarrier(elements, index, store->mir()->elementType());
+
+    if (store->mir()->needsHoleCheck() && !emitStoreHoleCheck(elements, index, store->snapshot()))
+        return false;
+
+    storeElementTyped(store->value(), store->mir()->value()->type(), store->mir()->elementType(),
+                      elements, index);
+    return true;
+}
+
+bool
+CodeGenerator::visitStoreElementV(LStoreElementV *lir)
+{
+    const ValueOperand value = ToValue(lir, LStoreElementV::Value);
+    Register elements = ToRegister(lir->elements());
+    const LAllocation *index = lir->index();
+
+    if (lir->mir()->needsBarrier())
+        emitPreBarrier(elements, index, MIRType_Value);
+
+    if (lir->mir()->needsHoleCheck() && !emitStoreHoleCheck(elements, index, lir->snapshot()))
+        return false;
+
+    if (lir->index()->isConstant())
+        masm.storeValue(value, Address(elements, ToInt32(lir->index()) * sizeof(js::Value)));
+    else
+        masm.storeValue(value, BaseIndex(elements, ToRegister(lir->index()), TimesEight));
+    return true;
+}
+
+bool
+CodeGenerator::visitStoreElementHoleT(LStoreElementHoleT *lir)
+{
+    OutOfLineStoreElementHole *ool = new(alloc()) OutOfLineStoreElementHole(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Register elements = ToRegister(lir->elements());
+    const LAllocation *index = lir->index();
+
+    // OOL path if index >= initializedLength.
+    Address initLength(elements, ObjectElements::offsetOfInitializedLength());
+    masm.branchKey(Assembler::BelowOrEqual, initLength, ToInt32Key(index), ool->entry());
+
+    if (lir->mir()->needsBarrier())
+        emitPreBarrier(elements, index, lir->mir()->elementType());
+
+    masm.bind(ool->rejoinStore());
+    storeElementTyped(lir->value(), lir->mir()->value()->type(), lir->mir()->elementType(),
+                      elements, index);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitStoreElementHoleV(LStoreElementHoleV *lir)
+{
+    OutOfLineStoreElementHole *ool = new(alloc()) OutOfLineStoreElementHole(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    Register elements = ToRegister(lir->elements());
+    const LAllocation *index = lir->index();
+    const ValueOperand value = ToValue(lir, LStoreElementHoleV::Value);
+
+    // OOL path if index >= initializedLength.
+    Address initLength(elements, ObjectElements::offsetOfInitializedLength());
+    masm.branchKey(Assembler::BelowOrEqual, initLength, ToInt32Key(index), ool->entry());
+
+    if (lir->mir()->needsBarrier())
+        emitPreBarrier(elements, index, lir->mir()->elementType());
+
+    masm.bind(ool->rejoinStore());
+    if (lir->index()->isConstant())
+        masm.storeValue(value, Address(elements, ToInt32(lir->index()) * sizeof(js::Value)));
+    else
+        masm.storeValue(value, BaseIndex(elements, ToRegister(lir->index()), TimesEight));
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef bool (*SetDenseElementFn)(JSContext *, HandleObject, int32_t, HandleValue,
+                                  bool strict);
+typedef bool (*SetDenseElementParFn)(ForkJoinContext *, HandleObject, int32_t, HandleValue, bool);
+static const VMFunctionsModal SetDenseElementInfo = VMFunctionsModal(
+    FunctionInfo<SetDenseElementFn>(SetDenseElement),
+    FunctionInfo<SetDenseElementParFn>(SetDenseElementPar));
+
+bool
+CodeGenerator::visitOutOfLineStoreElementHole(OutOfLineStoreElementHole *ool)
+{
+    Register object, elements;
+    LInstruction *ins = ool->ins();
+    const LAllocation *index;
+    MIRType valueType;
+    ConstantOrRegister value;
+
+    if (ins->isStoreElementHoleV()) {
+        LStoreElementHoleV *store = ins->toStoreElementHoleV();
+        object = ToRegister(store->object());
+        elements = ToRegister(store->elements());
+        index = store->index();
+        valueType = store->mir()->value()->type();
+        value = TypedOrValueRegister(ToValue(store, LStoreElementHoleV::Value));
+    } else {
+        LStoreElementHoleT *store = ins->toStoreElementHoleT();
+        object = ToRegister(store->object());
+        elements = ToRegister(store->elements());
+        index = store->index();
+        valueType = store->mir()->value()->type();
+        if (store->value()->isConstant())
+            value = ConstantOrRegister(*store->value()->toConstant());
+        else
+            value = TypedOrValueRegister(valueType, ToAnyRegister(store->value()));
+    }
+
+    // If index == initializedLength, try to bump the initialized length inline.
+    // If index > initializedLength, call a stub. Note that this relies on the
+    // condition flags sticking from the incoming branch.
+    Label callStub;
+#ifdef JS_CODEGEN_MIPS
+    // Had to reimplement for MIPS because there are no flags.
+    Address initLength(elements, ObjectElements::offsetOfInitializedLength());
+    masm.branchKey(Assembler::NotEqual, initLength, ToInt32Key(index), &callStub);
+#else
+    masm.j(Assembler::NotEqual, &callStub);
+#endif
+
+    Int32Key key = ToInt32Key(index);
+
+    // Check array capacity.
+    masm.branchKey(Assembler::BelowOrEqual, Address(elements, ObjectElements::offsetOfCapacity()),
+                   key, &callStub);
+
+    // Update initialized length. The capacity guard above ensures this won't overflow,
+    // due to NELEMENTS_LIMIT.
+    masm.bumpKey(&key, 1);
+    masm.storeKey(key, Address(elements, ObjectElements::offsetOfInitializedLength()));
+
+    // Update length if length < initializedLength.
+    Label dontUpdate;
+    masm.branchKey(Assembler::AboveOrEqual, Address(elements, ObjectElements::offsetOfLength()),
+                   key, &dontUpdate);
+    masm.storeKey(key, Address(elements, ObjectElements::offsetOfLength()));
+    masm.bind(&dontUpdate);
+
+    masm.bumpKey(&key, -1);
+
+    if (ins->isStoreElementHoleT() && valueType != MIRType_Double) {
+        // The inline path for StoreElementHoleT does not always store the type tag,
+        // so we do the store on the OOL path. We use MIRType_None for the element type
+        // so that storeElementTyped will always store the type tag.
+        storeElementTyped(ins->toStoreElementHoleT()->value(), valueType, MIRType_None, elements,
+                          index);
+        masm.jump(ool->rejoin());
+    } else {
+        // Jump to the inline path where we will store the value.
+        masm.jump(ool->rejoinStore());
+    }
+
+    masm.bind(&callStub);
+    saveLive(ins);
+
+    pushArg(Imm32(current->mir()->strict()));
+    pushArg(value);
+    if (index->isConstant())
+        pushArg(Imm32(ToInt32(index)));
+    else
+        pushArg(ToRegister(index));
+    pushArg(object);
+    if (!callVM(SetDenseElementInfo, ins))
+        return false;
+
+    restoreLive(ins);
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*ArrayPopShiftFn)(JSContext *, HandleObject, MutableHandleValue);
+static const VMFunction ArrayPopDenseInfo = FunctionInfo<ArrayPopShiftFn>(jit::ArrayPopDense);
+static const VMFunction ArrayShiftDenseInfo = FunctionInfo<ArrayPopShiftFn>(jit::ArrayShiftDense);
+
+bool
+CodeGenerator::emitArrayPopShift(LInstruction *lir, const MArrayPopShift *mir, Register obj,
+                                 Register elementsTemp, Register lengthTemp, TypedOrValueRegister out)
+{
+    OutOfLineCode *ool;
+
+    if (mir->mode() == MArrayPopShift::Pop) {
+        ool = oolCallVM(ArrayPopDenseInfo, lir, (ArgList(), obj), StoreValueTo(out));
+        if (!ool)
+            return false;
+    } else {
+        JS_ASSERT(mir->mode() == MArrayPopShift::Shift);
+        ool = oolCallVM(ArrayShiftDenseInfo, lir, (ArgList(), obj), StoreValueTo(out));
+        if (!ool)
+            return false;
+    }
+
+    // VM call if a write barrier is necessary.
+    masm.branchTestNeedsBarrier(Assembler::NonZero, lengthTemp, ool->entry());
+
+    // Load elements and length.
+    masm.loadPtr(Address(obj, JSObject::offsetOfElements()), elementsTemp);
+    masm.load32(Address(elementsTemp, ObjectElements::offsetOfLength()), lengthTemp);
+
+    // VM call if length != initializedLength.
+    Int32Key key = Int32Key(lengthTemp);
+    Address initLength(elementsTemp, ObjectElements::offsetOfInitializedLength());
+    masm.branchKey(Assembler::NotEqual, initLength, key, ool->entry());
+
+    // Test for length != 0. On zero length either take a VM call or generate
+    // an undefined value, depending on whether the call is known to produce
+    // undefined.
+    Label done;
+    if (mir->maybeUndefined()) {
+        Label notEmpty;
+        masm.branchTest32(Assembler::NonZero, lengthTemp, lengthTemp, &notEmpty);
+        masm.moveValue(UndefinedValue(), out.valueReg());
+        masm.jump(&done);
+        masm.bind(&notEmpty);
+    } else {
+        masm.branchTest32(Assembler::Zero, lengthTemp, lengthTemp, ool->entry());
+    }
+
+    masm.bumpKey(&key, -1);
+
+    if (mir->mode() == MArrayPopShift::Pop) {
+        masm.loadElementTypedOrValue(BaseIndex(elementsTemp, lengthTemp, TimesEight), out,
+                                     mir->needsHoleCheck(), ool->entry());
+    } else {
+        JS_ASSERT(mir->mode() == MArrayPopShift::Shift);
+        masm.loadElementTypedOrValue(Address(elementsTemp, 0), out, mir->needsHoleCheck(),
+                                     ool->entry());
+    }
+
+    // Handle the failure case when the array length is non-writable in the
+    // OOL path.  (Unlike in the adding-an-element cases, we can't rely on the
+    // capacity <= length invariant for such arrays to avoid an explicit
+    // check.)
+    Address elementFlags(elementsTemp, ObjectElements::offsetOfFlags());
+    Imm32 bit(ObjectElements::NONWRITABLE_ARRAY_LENGTH);
+    masm.branchTest32(Assembler::NonZero, elementFlags, bit, ool->entry());
+
+    // Now adjust length and initializedLength.
+    masm.store32(lengthTemp, Address(elementsTemp, ObjectElements::offsetOfLength()));
+    masm.store32(lengthTemp, Address(elementsTemp, ObjectElements::offsetOfInitializedLength()));
+
+    if (mir->mode() == MArrayPopShift::Shift) {
+        // Don't save the temp registers.
+        RegisterSet temps;
+        temps.add(elementsTemp);
+        temps.add(lengthTemp);
+
+        saveVolatile(temps);
+        masm.setupUnalignedABICall(1, lengthTemp);
+        masm.passABIArg(obj);
+        masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, js::ArrayShiftMoveElements));
+        restoreVolatile(temps);
+    }
+
+    masm.bind(&done);
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitArrayPopShiftV(LArrayPopShiftV *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register elements = ToRegister(lir->temp0());
+    Register length = ToRegister(lir->temp1());
+    TypedOrValueRegister out(ToOutValue(lir));
+    return emitArrayPopShift(lir, lir->mir(), obj, elements, length, out);
+}
+
+bool
+CodeGenerator::visitArrayPopShiftT(LArrayPopShiftT *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register elements = ToRegister(lir->temp0());
+    Register length = ToRegister(lir->temp1());
+    TypedOrValueRegister out(lir->mir()->type(), ToAnyRegister(lir->output()));
+    return emitArrayPopShift(lir, lir->mir(), obj, elements, length, out);
+}
+
+typedef bool (*ArrayPushDenseFn)(JSContext *, HandleObject, HandleValue, uint32_t *);
+static const VMFunction ArrayPushDenseInfo =
+    FunctionInfo<ArrayPushDenseFn>(jit::ArrayPushDense);
+
+bool
+CodeGenerator::emitArrayPush(LInstruction *lir, const MArrayPush *mir, Register obj,
+                             ConstantOrRegister value, Register elementsTemp, Register length)
+{
+    OutOfLineCode *ool = oolCallVM(ArrayPushDenseInfo, lir, (ArgList(), obj, value), StoreRegisterTo(length));
+    if (!ool)
+        return false;
+
+    // Load elements and length.
+    masm.loadPtr(Address(obj, JSObject::offsetOfElements()), elementsTemp);
+    masm.load32(Address(elementsTemp, ObjectElements::offsetOfLength()), length);
+
+    Int32Key key = Int32Key(length);
+    Address initLength(elementsTemp, ObjectElements::offsetOfInitializedLength());
+    Address capacity(elementsTemp, ObjectElements::offsetOfCapacity());
+
+    // Guard length == initializedLength.
+    masm.branchKey(Assembler::NotEqual, initLength, key, ool->entry());
+
+    // Guard length < capacity.
+    masm.branchKey(Assembler::BelowOrEqual, capacity, key, ool->entry());
+
+    masm.storeConstantOrRegister(value, BaseIndex(elementsTemp, length, TimesEight));
+
+    masm.bumpKey(&key, 1);
+    masm.store32(length, Address(elementsTemp, ObjectElements::offsetOfLength()));
+    masm.store32(length, Address(elementsTemp, ObjectElements::offsetOfInitializedLength()));
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitArrayPushV(LArrayPushV *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register elementsTemp = ToRegister(lir->temp());
+    Register length = ToRegister(lir->output());
+    ConstantOrRegister value = TypedOrValueRegister(ToValue(lir, LArrayPushV::Value));
+    return emitArrayPush(lir, lir->mir(), obj, value, elementsTemp, length);
+}
+
+bool
+CodeGenerator::visitArrayPushT(LArrayPushT *lir)
+{
+    Register obj = ToRegister(lir->object());
+    Register elementsTemp = ToRegister(lir->temp());
+    Register length = ToRegister(lir->output());
+    ConstantOrRegister value;
+    if (lir->value()->isConstant())
+        value = ConstantOrRegister(*lir->value()->toConstant());
+    else
+        value = TypedOrValueRegister(lir->mir()->value()->type(), ToAnyRegister(lir->value()));
+    return emitArrayPush(lir, lir->mir(), obj, value, elementsTemp, length);
+}
+
+typedef JSObject *(*ArrayConcatDenseFn)(JSContext *, HandleObject, HandleObject, HandleObject);
+static const VMFunction ArrayConcatDenseInfo = FunctionInfo<ArrayConcatDenseFn>(ArrayConcatDense);
+
+bool
+CodeGenerator::visitArrayConcat(LArrayConcat *lir)
+{
+    Register lhs = ToRegister(lir->lhs());
+    Register rhs = ToRegister(lir->rhs());
+    Register temp1 = ToRegister(lir->temp1());
+    Register temp2 = ToRegister(lir->temp2());
+
+    // If 'length == initializedLength' for both arrays we try to allocate an object
+    // inline and pass it to the stub. Else, we just pass nullptr and the stub falls
+    // back to a slow path.
+    Label fail, call;
+    masm.loadPtr(Address(lhs, JSObject::offsetOfElements()), temp1);
+    masm.load32(Address(temp1, ObjectElements::offsetOfInitializedLength()), temp2);
+    masm.branch32(Assembler::NotEqual, Address(temp1, ObjectElements::offsetOfLength()), temp2, &fail);
+
+    masm.loadPtr(Address(rhs, JSObject::offsetOfElements()), temp1);
+    masm.load32(Address(temp1, ObjectElements::offsetOfInitializedLength()), temp2);
+    masm.branch32(Assembler::NotEqual, Address(temp1, ObjectElements::offsetOfLength()), temp2, &fail);
+
+    // Try to allocate an object.
+    JSObject *templateObj = lir->mir()->templateObj();
+    masm.newGCThing(temp1, temp2, templateObj, &fail, lir->mir()->initialHeap());
+    masm.initGCThing(temp1, temp2, templateObj);
+    masm.jump(&call);
+    {
+        masm.bind(&fail);
+        masm.movePtr(ImmPtr(nullptr), temp1);
+    }
+    masm.bind(&call);
+
+    pushArg(temp1);
+    pushArg(ToRegister(lir->rhs()));
+    pushArg(ToRegister(lir->lhs()));
+    return callVM(ArrayConcatDenseInfo, lir);
+}
+
+typedef JSObject *(*GetIteratorObjectFn)(JSContext *, HandleObject, uint32_t);
+static const VMFunction GetIteratorObjectInfo = FunctionInfo<GetIteratorObjectFn>(GetIteratorObject);
+
+bool
+CodeGenerator::visitCallIteratorStart(LCallIteratorStart *lir)
+{
+    pushArg(Imm32(lir->mir()->flags()));
+    pushArg(ToRegister(lir->object()));
+    return callVM(GetIteratorObjectInfo, lir);
+}
+
+bool
+CodeGenerator::visitIteratorStart(LIteratorStart *lir)
+{
+    const Register obj = ToRegister(lir->object());
+    const Register output = ToRegister(lir->output());
+
+    uint32_t flags = lir->mir()->flags();
+
+    OutOfLineCode *ool = oolCallVM(GetIteratorObjectInfo, lir,
+                                   (ArgList(), obj, Imm32(flags)), StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    const Register temp1 = ToRegister(lir->temp1());
+    const Register temp2 = ToRegister(lir->temp2());
+    const Register niTemp = ToRegister(lir->temp3()); // Holds the NativeIterator object.
+
+    // Iterators other than for-in should use LCallIteratorStart.
+    JS_ASSERT(flags == JSITER_ENUMERATE);
+
+    // Fetch the most recent iterator and ensure it's not nullptr.
+    masm.loadPtr(AbsoluteAddress(GetIonContext()->runtime->addressOfLastCachedNativeIterator()), output);
+    masm.branchTestPtr(Assembler::Zero, output, output, ool->entry());
+
+    // Load NativeIterator.
+    masm.loadObjPrivate(output, JSObject::ITER_CLASS_NFIXED_SLOTS, niTemp);
+
+    // Ensure the |active| and |unreusable| bits are not set.
+    masm.branchTest32(Assembler::NonZero, Address(niTemp, offsetof(NativeIterator, flags)),
+                      Imm32(JSITER_ACTIVE|JSITER_UNREUSABLE), ool->entry());
+
+    // Load the iterator's shape array.
+    masm.loadPtr(Address(niTemp, offsetof(NativeIterator, shapes_array)), temp2);
+
+    // Compare shape of object with the first shape.
+    masm.loadObjShape(obj, temp1);
+    masm.branchPtr(Assembler::NotEqual, Address(temp2, 0), temp1, ool->entry());
+
+    // Compare shape of object's prototype with the second shape.
+    masm.loadObjProto(obj, temp1);
+    masm.loadObjShape(temp1, temp1);
+    masm.branchPtr(Assembler::NotEqual, Address(temp2, sizeof(Shape *)), temp1, ool->entry());
+
+    // Ensure the object's prototype's prototype is nullptr. The last native
+    // iterator will always have a prototype chain length of one (i.e. it must
+    // be a plain ), so we do not need to generate a loop here.
+    masm.loadObjProto(obj, temp1);
+    masm.loadObjProto(temp1, temp1);
+    masm.branchTestPtr(Assembler::NonZero, temp1, temp1, ool->entry());
+
+    // Ensure the object does not have any elements. The presence of dense
+    // elements is not captured by the shape tests above.
+    masm.branchPtr(Assembler::NotEqual,
+                   Address(obj, JSObject::offsetOfElements()),
+                   ImmPtr(js::emptyObjectElements),
+                   ool->entry());
+
+    // Write barrier for stores to the iterator. We only need to take a write
+    // barrier if NativeIterator::obj is actually going to change.
+    {
+#ifdef JSGC_GENERATIONAL
+        // Bug 867815: When using a nursery, we unconditionally take this out-
+        // of-line so that we do not have to post-barrier the store to
+        // NativeIter::obj. This just needs JIT support for the Cell* buffer.
+        Address objAddr(niTemp, offsetof(NativeIterator, obj));
+        masm.branchPtr(Assembler::NotEqual, objAddr, obj, ool->entry());
+#else
+        Label noBarrier;
+        masm.branchTestNeedsBarrier(Assembler::Zero, temp1, &noBarrier);
+
+        Address objAddr(niTemp, offsetof(NativeIterator, obj));
+        masm.branchPtr(Assembler::NotEqual, objAddr, obj, ool->entry());
+
+        masm.bind(&noBarrier);
+#endif // !JSGC_GENERATIONAL
+    }
+
+    // Mark iterator as active.
+    masm.storePtr(obj, Address(niTemp, offsetof(NativeIterator, obj)));
+    masm.or32(Imm32(JSITER_ACTIVE), Address(niTemp, offsetof(NativeIterator, flags)));
+
+    // Chain onto the active iterator stack.
+    masm.loadPtr(AbsoluteAddress(gen->compartment->addressOfEnumerators()), temp1);
+
+    // ni->next = list
+    masm.storePtr(temp1, Address(niTemp, NativeIterator::offsetOfNext()));
+
+    // ni->prev = list->prev
+    masm.loadPtr(Address(temp1, NativeIterator::offsetOfPrev()), temp2);
+    masm.storePtr(temp2, Address(niTemp, NativeIterator::offsetOfPrev()));
+
+    // list->prev->next = ni
+    masm.storePtr(niTemp, Address(temp2, NativeIterator::offsetOfNext()));
+
+    // list->prev = ni
+    masm.storePtr(niTemp, Address(temp1, NativeIterator::offsetOfPrev()));
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+static void
+LoadNativeIterator(MacroAssembler &masm, Register obj, Register dest, Label *failures)
+{
+    JS_ASSERT(obj != dest);
+
+    // Test class.
+    masm.branchTestObjClass(Assembler::NotEqual, obj, dest, &PropertyIteratorObject::class_, failures);
+
+    // Load NativeIterator object.
+    masm.loadObjPrivate(obj, JSObject::ITER_CLASS_NFIXED_SLOTS, dest);
+}
+
+typedef bool (*IteratorNextFn)(JSContext *, HandleObject, MutableHandleValue);
+static const VMFunction IteratorNextInfo = FunctionInfo<IteratorNextFn>(js_IteratorNext);
+
+bool
+CodeGenerator::visitIteratorNext(LIteratorNext *lir)
+{
+    const Register obj = ToRegister(lir->object());
+    const Register temp = ToRegister(lir->temp());
+    const ValueOperand output = ToOutValue(lir);
+
+    OutOfLineCode *ool = oolCallVM(IteratorNextInfo, lir, (ArgList(), obj), StoreValueTo(output));
+    if (!ool)
+        return false;
+
+    LoadNativeIterator(masm, obj, temp, ool->entry());
+
+    masm.branchTest32(Assembler::NonZero, Address(temp, offsetof(NativeIterator, flags)),
+                      Imm32(JSITER_FOREACH), ool->entry());
+
+    // Get cursor, next string.
+    masm.loadPtr(Address(temp, offsetof(NativeIterator, props_cursor)), output.scratchReg());
+    masm.loadPtr(Address(output.scratchReg(), 0), output.scratchReg());
+    masm.tagValue(JSVAL_TYPE_STRING, output.scratchReg(), output);
+
+    // Increase the cursor.
+    masm.addPtr(Imm32(sizeof(JSString *)), Address(temp, offsetof(NativeIterator, props_cursor)));
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef bool (*IteratorMoreFn)(JSContext *, HandleObject, bool *);
+static const VMFunction IteratorMoreInfo = FunctionInfo<IteratorMoreFn>(jit::IteratorMore);
+
+bool
+CodeGenerator::visitIteratorMore(LIteratorMore *lir)
+{
+    const Register obj = ToRegister(lir->object());
+    const Register output = ToRegister(lir->output());
+    const Register temp = ToRegister(lir->temp());
+
+    OutOfLineCode *ool = oolCallVM(IteratorMoreInfo, lir,
+                                   (ArgList(), obj), StoreRegisterTo(output));
+    if (!ool)
+        return false;
+
+    LoadNativeIterator(masm, obj, output, ool->entry());
+
+    masm.branchTest32(Assembler::NonZero, Address(output, offsetof(NativeIterator, flags)),
+                      Imm32(JSITER_FOREACH), ool->entry());
+
+    // Set output to true if props_cursor < props_end.
+    masm.loadPtr(Address(output, offsetof(NativeIterator, props_end)), temp);
+    masm.cmpPtrSet(Assembler::LessThan, Address(output, offsetof(NativeIterator, props_cursor)),
+                   temp, output);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef bool (*CloseIteratorFn)(JSContext *, HandleObject);
+static const VMFunction CloseIteratorInfo = FunctionInfo<CloseIteratorFn>(CloseIterator);
+
+bool
+CodeGenerator::visitIteratorEnd(LIteratorEnd *lir)
+{
+    const Register obj = ToRegister(lir->object());
+    const Register temp1 = ToRegister(lir->temp1());
+    const Register temp2 = ToRegister(lir->temp2());
+    const Register temp3 = ToRegister(lir->temp3());
+
+    OutOfLineCode *ool = oolCallVM(CloseIteratorInfo, lir, (ArgList(), obj), StoreNothing());
+    if (!ool)
+        return false;
+
+    LoadNativeIterator(masm, obj, temp1, ool->entry());
+
+    masm.branchTest32(Assembler::Zero, Address(temp1, offsetof(NativeIterator, flags)),
+                      Imm32(JSITER_ENUMERATE), ool->entry());
+
+    // Clear active bit.
+    masm.and32(Imm32(~JSITER_ACTIVE), Address(temp1, offsetof(NativeIterator, flags)));
+
+    // Reset property cursor.
+    masm.loadPtr(Address(temp1, offsetof(NativeIterator, props_array)), temp2);
+    masm.storePtr(temp2, Address(temp1, offsetof(NativeIterator, props_cursor)));
+
+    // Unlink from the iterator list.
+    const Register next = temp2;
+    const Register prev = temp3;
+    masm.loadPtr(Address(temp1, NativeIterator::offsetOfNext()), next);
+    masm.loadPtr(Address(temp1, NativeIterator::offsetOfPrev()), prev);
+    masm.storePtr(prev, Address(next, NativeIterator::offsetOfPrev()));
+    masm.storePtr(next, Address(prev, NativeIterator::offsetOfNext()));
+#ifdef DEBUG
+    masm.storePtr(ImmPtr(nullptr), Address(temp1, NativeIterator::offsetOfNext()));
+    masm.storePtr(ImmPtr(nullptr), Address(temp1, NativeIterator::offsetOfPrev()));
+#endif
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitArgumentsLength(LArgumentsLength *lir)
+{
+    // read number of actual arguments from the JS frame.
+    Register argc = ToRegister(lir->output());
+    Address ptr(StackPointer, frameSize() + IonJSFrameLayout::offsetOfNumActualArgs());
+
+    masm.loadPtr(ptr, argc);
+    return true;
+}
+
+bool
+CodeGenerator::visitGetFrameArgument(LGetFrameArgument *lir)
+{
+    ValueOperand result = GetValueOutput(lir);
+    const LAllocation *index = lir->index();
+    size_t argvOffset = frameSize() + IonJSFrameLayout::offsetOfActualArgs();
+
+    if (index->isConstant()) {
+        int32_t i = index->toConstant()->toInt32();
+        Address argPtr(StackPointer, sizeof(Value) * i + argvOffset);
+        masm.loadValue(argPtr, result);
+    } else {
+        Register i = ToRegister(index);
+        BaseIndex argPtr(StackPointer, i, ScaleFromElemWidth(sizeof(Value)), argvOffset);
+        masm.loadValue(argPtr, result);
+    }
+    return true;
+}
+
+bool
+CodeGenerator::visitSetFrameArgumentT(LSetFrameArgumentT *lir)
+{
+    size_t argOffset = frameSize() + IonJSFrameLayout::offsetOfActualArgs() +
+                       (sizeof(Value) * lir->mir()->argno());
+
+    MIRType type = lir->mir()->value()->type();
+
+    if (type == MIRType_Double) {
+        // Store doubles directly.
+        FloatRegister input = ToFloatRegister(lir->input());
+        masm.storeDouble(input, Address(StackPointer, argOffset));
+
+    } else {
+        Register input = ToRegister(lir->input());
+        masm.storeValue(ValueTypeFromMIRType(type), input, Address(StackPointer, argOffset));
+    }
+    return true;
+}
+
+bool
+CodeGenerator:: visitSetFrameArgumentC(LSetFrameArgumentC *lir)
+{
+    size_t argOffset = frameSize() + IonJSFrameLayout::offsetOfActualArgs() +
+                       (sizeof(Value) * lir->mir()->argno());
+    masm.storeValue(lir->val(), Address(StackPointer, argOffset));
+    return true;
+}
+
+bool
+CodeGenerator:: visitSetFrameArgumentV(LSetFrameArgumentV *lir)
+{
+    const ValueOperand val = ToValue(lir, LSetFrameArgumentV::Input);
+    size_t argOffset = frameSize() + IonJSFrameLayout::offsetOfActualArgs() +
+                       (sizeof(Value) * lir->mir()->argno());
+    masm.storeValue(val, Address(StackPointer, argOffset));
+    return true;
+}
+
+typedef bool (*RunOnceScriptPrologueFn)(JSContext *, HandleScript);
+static const VMFunction RunOnceScriptPrologueInfo =
+    FunctionInfo<RunOnceScriptPrologueFn>(js::RunOnceScriptPrologue);
+
+bool
+CodeGenerator::visitRunOncePrologue(LRunOncePrologue *lir)
+{
+    pushArg(ImmGCPtr(lir->mir()->block()->info().script()));
+    return callVM(RunOnceScriptPrologueInfo, lir);
+}
+
+
+typedef JSObject *(*InitRestParameterFn)(JSContext *, uint32_t, Value *, HandleObject,
+                                         HandleObject);
+typedef JSObject *(*InitRestParameterParFn)(ForkJoinContext *, uint32_t, Value *,
+                                            HandleObject, HandleObject);
+static const VMFunctionsModal InitRestParameterInfo = VMFunctionsModal(
+    FunctionInfo<InitRestParameterFn>(InitRestParameter),
+    FunctionInfo<InitRestParameterParFn>(InitRestParameterPar));
+
+bool
+CodeGenerator::emitRest(LInstruction *lir, Register array, Register numActuals,
+                        Register temp0, Register temp1, unsigned numFormals,
+                        JSObject *templateObject)
+{
+    // Compute actuals() + numFormals.
+    size_t actualsOffset = frameSize() + IonJSFrameLayout::offsetOfActualArgs();
+    masm.movePtr(StackPointer, temp1);
+    masm.addPtr(Imm32(sizeof(Value) * numFormals + actualsOffset), temp1);
+
+    // Compute numActuals - numFormals.
+    Label emptyLength, joinLength;
+    masm.movePtr(numActuals, temp0);
+    masm.branch32(Assembler::LessThanOrEqual, temp0, Imm32(numFormals), &emptyLength);
+    masm.sub32(Imm32(numFormals), temp0);
+    masm.jump(&joinLength);
+    {
+        masm.bind(&emptyLength);
+        masm.move32(Imm32(0), temp0);
+    }
+    masm.bind(&joinLength);
+
+    pushArg(array);
+    pushArg(ImmGCPtr(templateObject));
+    pushArg(temp1);
+    pushArg(temp0);
+
+    return callVM(InitRestParameterInfo, lir);
+}
+
+bool
+CodeGenerator::visitRest(LRest *lir)
+{
+    Register numActuals = ToRegister(lir->numActuals());
+    Register temp0 = ToRegister(lir->getTemp(0));
+    Register temp1 = ToRegister(lir->getTemp(1));
+    Register temp2 = ToRegister(lir->getTemp(2));
+    unsigned numFormals = lir->mir()->numFormals();
+    JSObject *templateObject = lir->mir()->templateObject();
+
+    Label joinAlloc, failAlloc;
+    masm.newGCThing(temp2, temp0, templateObject, &failAlloc, gc::DefaultHeap);
+    masm.initGCThing(temp2, temp0, templateObject);
+    masm.jump(&joinAlloc);
+    {
+        masm.bind(&failAlloc);
+        masm.movePtr(ImmPtr(nullptr), temp2);
+    }
+    masm.bind(&joinAlloc);
+
+    return emitRest(lir, temp2, numActuals, temp0, temp1, numFormals, templateObject);
+}
+
+bool
+CodeGenerator::visitRestPar(LRestPar *lir)
+{
+    Register numActuals = ToRegister(lir->numActuals());
+    Register cx = ToRegister(lir->forkJoinContext());
+    Register temp0 = ToRegister(lir->getTemp(0));
+    Register temp1 = ToRegister(lir->getTemp(1));
+    Register temp2 = ToRegister(lir->getTemp(2));
+    unsigned numFormals = lir->mir()->numFormals();
+    JSObject *templateObject = lir->mir()->templateObject();
+
+    if (!emitAllocateGCThingPar(lir, temp2, cx, temp0, temp1, templateObject))
+        return false;
+
+    return emitRest(lir, temp2, numActuals, temp0, temp1, numFormals, templateObject);
+}
+
+bool
+CodeGenerator::generateAsmJS(Label *stackOverflowLabel)
+{
+    IonSpew(IonSpew_Codegen, "# Emitting asm.js code");
+
+    // AsmJS doesn't do profiler instrumentation.
+    sps_.disable();
+
+    // The caller (either another asm.js function or the external-entry
+    // trampoline) has placed all arguments in registers and on the stack
+    // according to the system ABI. The MAsmJSParameters which represent these
+    // parameters have been useFixed()ed to these ABI-specified positions.
+    // Thus, there is nothing special to do in the prologue except (possibly)
+    // bump the stack.
+    if (!generateAsmJSPrologue(stackOverflowLabel))
+        return false;
+    if (!generateBody())
+        return false;
+    if (!generateEpilogue())
+        return false;
+#if defined(JS_ION_PERF)
+    // Note the end of the inline code and start of the OOL code.
+    gen->perfSpewer().noteEndInlineCode(masm);
+#endif
+    if (!generateOutOfLineCode())
+        return false;
+
+    // The only remaining work needed to compile this function is to patch the
+    // switch-statement jump tables (the entries of the table need the absolute
+    // address of the cases). These table entries are accmulated as CodeLabels
+    // in the MacroAssembler's codeLabels_ list and processed all at once at in
+    // the "static-link" phase of module compilation. It is critical that there
+    // is nothing else to do after this point since the LifoAlloc memory
+    // holding the MIR graph is about to be popped and reused. In particular,
+    // every step in CodeGenerator::link must be a nop, as asserted here:
+    JS_ASSERT(snapshots_.listSize() == 0);
+    JS_ASSERT(snapshots_.RVATableSize() == 0);
+    JS_ASSERT(recovers_.size() == 0);
+    JS_ASSERT(bailouts_.empty());
+    JS_ASSERT(graph.numConstants() == 0);
+    JS_ASSERT(safepointIndices_.empty());
+    JS_ASSERT(osiIndices_.empty());
+    JS_ASSERT(cacheList_.empty());
+    JS_ASSERT(safepoints_.size() == 0);
+    return true;
+}
+
+bool
+CodeGenerator::generate()
+{
+    IonSpew(IonSpew_Codegen, "# Emitting code for script %s:%d",
+            gen->info().script()->filename(),
+            gen->info().script()->lineno());
+
+    if (!snapshots_.init())
+        return false;
+
+    if (!safepoints_.init(gen->alloc(), graph.totalSlotCount()))
+        return false;
+
+#ifdef JS_TRACE_LOGGING
+    if (!gen->compilingAsmJS() && gen->info().executionMode() == SequentialExecution) {
+        if (!emitTracelogScriptStart())
+            return false;
+        if (!emitTracelogStartEvent(TraceLogger::IonMonkey))
+            return false;
+    }
+#endif
+
+    // Before generating any code, we generate type checks for all parameters.
+    // This comes before deoptTable_, because we can't use deopt tables without
+    // creating the actual frame.
+    if (!generateArgumentsChecks())
+        return false;
+
+    if (frameClass_ != FrameSizeClass::None()) {
+        deoptTable_ = gen->jitRuntime()->getBailoutTable(frameClass_);
+        if (!deoptTable_)
+            return false;
+    }
+
+#ifdef JS_TRACE_LOGGING
+    Label skip;
+    masm.jump(&skip);
+#endif
+
+    // Remember the entry offset to skip the argument check.
+    masm.flushBuffer();
+    setSkipArgCheckEntryOffset(masm.size());
+
+#ifdef JS_TRACE_LOGGING
+    if (!gen->compilingAsmJS() && gen->info().executionMode() == SequentialExecution) {
+        if (!emitTracelogScriptStart())
+            return false;
+        if (!emitTracelogStartEvent(TraceLogger::IonMonkey))
+            return false;
+    }
+    masm.bind(&skip);
+#endif
+
+#ifdef DEBUG
+    // Assert that the argument types are correct.
+    if (!generateArgumentsChecks(/* bailout = */ false))
+        return false;
+#endif
+
+    if (!generatePrologue())
+        return false;
+    if (!generateBody())
+        return false;
+    if (!generateEpilogue())
+        return false;
+    if (!generateInvalidateEpilogue())
+        return false;
+#if defined(JS_ION_PERF)
+    // Note the end of the inline code and start of the OOL code.
+    perfSpewer_.noteEndInlineCode(masm);
+#endif
+    if (!generateOutOfLineCode())
+        return false;
+
+    return !masm.oom();
+}
+
+bool
+CodeGenerator::link(JSContext *cx, types::CompilerConstraintList *constraints)
+{
+    RootedScript script(cx, gen->info().script());
+    ExecutionMode executionMode = gen->info().executionMode();
+    OptimizationLevel optimizationLevel = gen->optimizationInfo().level();
+
+    JS_ASSERT_IF(HasIonScript(script, executionMode), executionMode == SequentialExecution);
+
+    // We finished the new IonScript. Invalidate the current active IonScript,
+    // so we can replace it with this new (probably higher optimized) version.
+    if (HasIonScript(script, executionMode)) {
+        JS_ASSERT(GetIonScript(script, executionMode)->isRecompiling());
+        // Do a normal invalidate, except don't cancel offThread compilations,
+        // since that will cancel this compilation too.
+        if (!Invalidate(cx, script, SequentialExecution,
+                        /* resetUses */ false, /* cancelOffThread*/ false))
+        {
+            return false;
+        }
+    }
+
+    // Check to make sure we didn't have a mid-build invalidation. If so, we
+    // will trickle to jit::Compile() and return Method_Skipped.
+    types::RecompileInfo recompileInfo;
+    if (!types::FinishCompilation(cx, script, executionMode, constraints, &recompileInfo))
+        return true;
+
+    uint32_t scriptFrameSize = frameClass_ == FrameSizeClass::None()
+                           ? frameDepth_
+                           : FrameSizeClass::FromDepth(frameDepth_).frameSize();
+
+    // We encode safepoints after the OSI-point offsets have been determined.
+    encodeSafepoints();
+
+    // List of possible scripts that this graph may call. Currently this is
+    // only tracked when compiling for parallel execution.
+    CallTargetVector callTargets(alloc());
+    if (executionMode == ParallelExecution)
+        AddPossibleCallees(cx, graph.mir(), callTargets);
+
+    IonScript *ionScript =
+      IonScript::New(cx, recompileInfo,
+                     graph.totalSlotCount(), scriptFrameSize,
+                     snapshots_.listSize(), snapshots_.RVATableSize(),
+                     recovers_.size(), bailouts_.length(), graph.numConstants(),
+                     safepointIndices_.length(), osiIndices_.length(),
+                     cacheList_.length(), runtimeData_.length(),
+                     safepoints_.size(), callTargets.length(),
+                     patchableBackedges_.length(), optimizationLevel);
+    if (!ionScript) {
+        recompileInfo.compilerOutput(cx->zone()->types)->invalidate();
+        return false;
+    }
+
+    // Lock the runtime against interrupt callbacks during the link.
+    // We don't want an interrupt request to protect the code for the script
+    // before it has been filled in, as we could segv before the runtime's
+    // patchable backedges have been fully updated.
+    JSRuntime::AutoLockForInterrupt lock(cx->runtime());
+
+    // Make sure we don't segv while filling in the code, to avoid deadlocking
+    // inside the signal handler.
+    cx->runtime()->jitRuntime()->ensureIonCodeAccessible(cx->runtime());
+
+    // Implicit interrupts are used only for sequential code. In parallel mode
+    // use the normal executable allocator so that we cannot segv during
+    // execution off the main thread.
+    Linker linker(masm);
+    AutoFlushICache afc("IonLink");
+    JitCode *code = (executionMode == SequentialExecution)
+                    ? linker.newCodeForIonScript(cx)
+                    : linker.newCode<CanGC>(cx, JSC::ION_CODE);
+    if (!code) {
+        // Use js_free instead of IonScript::Destroy: the cache list and
+        // backedge list are still uninitialized.
+        js_free(ionScript);
+        recompileInfo.compilerOutput(cx->zone()->types)->invalidate();
+        return false;
+    }
+
+    ionScript->setMethod(code);
+    ionScript->setSkipArgCheckEntryOffset(getSkipArgCheckEntryOffset());
+
+    // If SPS is enabled, mark IonScript as having been instrumented with SPS
+    if (sps_.enabled())
+        ionScript->setHasSPSInstrumentation();
+
+    SetIonScript(script, executionMode, ionScript);
+
+    if (cx->runtime()->spsProfiler.enabled()) {
+        const char *filename = script->filename();
+        if (filename == nullptr)
+            filename = "<unknown>";
+        unsigned len = strlen(filename) + 50;
+        char *buf = js_pod_malloc<char>(len);
+        if (!buf)
+            return false;
+        JS_snprintf(buf, len, "Ion compiled %s:%d", filename, (int) script->lineno());
+        cx->runtime()->spsProfiler.markEvent(buf);
+        js_free(buf);
+    }
+
+    // In parallel execution mode, when we first compile a script, we
+    // don't know that its potential callees are compiled, so set a
+    // flag warning that the callees may not be fully compiled.
+    if (!callTargets.empty())
+        ionScript->setHasUncompiledCallTarget();
+
+    invalidateEpilogueData_.fixup(&masm);
+    Assembler::patchDataWithValueCheck(CodeLocationLabel(code, invalidateEpilogueData_),
+                                       ImmPtr(ionScript),
+                                       ImmPtr((void*)-1));
+
+    IonSpew(IonSpew_Codegen, "Created IonScript %p (raw %p)",
+            (void *) ionScript, (void *) code->raw());
+
+    ionScript->setInvalidationEpilogueDataOffset(invalidateEpilogueData_.offset());
+    ionScript->setOsrPc(gen->info().osrPc());
+    ionScript->setOsrEntryOffset(getOsrEntryOffset());
+    ptrdiff_t real_invalidate = masm.actualOffset(invalidate_.offset());
+    ionScript->setInvalidationEpilogueOffset(real_invalidate);
+
+    ionScript->setDeoptTable(deoptTable_);
+
+#if defined(JS_ION_PERF)
+    if (PerfEnabled())
+        perfSpewer_.writeProfile(script, code, masm);
+#endif
+
+    for (size_t i = 0; i < ionScriptLabels_.length(); i++) {
+        ionScriptLabels_[i].fixup(&masm);
+        Assembler::patchDataWithValueCheck(CodeLocationLabel(code, ionScriptLabels_[i]),
+                                           ImmPtr(ionScript),
+                                           ImmPtr((void*)-1));
+    }
+
+    // for generating inline caches during the execution.
+    if (runtimeData_.length())
+        ionScript->copyRuntimeData(&runtimeData_[0]);
+    if (cacheList_.length())
+        ionScript->copyCacheEntries(&cacheList_[0], masm);
+
+    // for marking during GC.
+    if (safepointIndices_.length())
+        ionScript->copySafepointIndices(&safepointIndices_[0], masm);
+    if (safepoints_.size())
+        ionScript->copySafepoints(&safepoints_);
+
+    // for reconvering from an Ion Frame.
+    if (bailouts_.length())
+        ionScript->copyBailoutTable(&bailouts_[0]);
+    if (osiIndices_.length())
+        ionScript->copyOsiIndices(&osiIndices_[0], masm);
+    if (snapshots_.listSize())
+        ionScript->copySnapshots(&snapshots_);
+    MOZ_ASSERT_IF(snapshots_.listSize(), recovers_.size());
+    if (recovers_.size())
+        ionScript->copyRecovers(&recovers_);
+    if (graph.numConstants())
+        ionScript->copyConstants(graph.constantPool());
+    if (callTargets.length() > 0)
+        ionScript->copyCallTargetEntries(callTargets.begin());
+    if (patchableBackedges_.length() > 0)
+        ionScript->copyPatchableBackedges(cx, code, patchableBackedges_.begin());
+
+#ifdef JS_TRACE_LOGGING
+    TraceLogger *logger = TraceLoggerForMainThread(cx->runtime());
+    for (uint32_t i = 0; i < patchableTraceLoggers_.length(); i++) {
+        patchableTraceLoggers_[i].fixup(&masm);
+        Assembler::patchDataWithValueCheck(CodeLocationLabel(code, patchableTraceLoggers_[i]),
+                                           ImmPtr(logger),
+                                           ImmPtr(nullptr));
+    }
+    uint32_t scriptId = TraceLogCreateTextId(logger, script);
+    for (uint32_t i = 0; i < patchableTLScripts_.length(); i++) {
+        patchableTLScripts_[i].fixup(&masm);
+        Assembler::patchDataWithValueCheck(CodeLocationLabel(code, patchableTLScripts_[i]),
+                                           ImmPtr((void *) uintptr_t(scriptId)),
+                                           ImmPtr((void *)0));
+    }
+#endif
+
+    switch (executionMode) {
+      case SequentialExecution:
+        // The correct state for prebarriers is unknown until the end of compilation,
+        // since a GC can occur during code generation. All barriers are emitted
+        // off-by-default, and are toggled on here if necessary.
+        if (cx->zone()->needsBarrier())
+            ionScript->toggleBarriers(true);
+        break;
+      case ParallelExecution:
+        // We don't run incremental GC during parallel execution; no need to
+        // turn on barriers.
+        break;
+      default:
+        MOZ_ASSUME_UNREACHABLE("No such execution mode");
+    }
+
+    return true;
+}
+
+// An out-of-line path to convert a boxed int32 to either a float or double.
+class OutOfLineUnboxFloatingPoint : public OutOfLineCodeBase<CodeGenerator>
+{
+    LUnboxFloatingPoint *unboxFloatingPoint_;
+
+  public:
+    OutOfLineUnboxFloatingPoint(LUnboxFloatingPoint *unboxFloatingPoint)
+      : unboxFloatingPoint_(unboxFloatingPoint)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineUnboxFloatingPoint(this);
+    }
+
+    LUnboxFloatingPoint *unboxFloatingPoint() const {
+        return unboxFloatingPoint_;
+    }
+};
+
+bool
+CodeGenerator::visitUnboxFloatingPoint(LUnboxFloatingPoint *lir)
+{
+    const ValueOperand box = ToValue(lir, LUnboxFloatingPoint::Input);
+    const LDefinition *result = lir->output();
+
+    // Out-of-line path to convert int32 to double or bailout
+    // if this instruction is fallible.
+    OutOfLineUnboxFloatingPoint *ool = new(alloc()) OutOfLineUnboxFloatingPoint(lir);
+    if (!addOutOfLineCode(ool))
+        return false;
+
+    FloatRegister resultReg = ToFloatRegister(result);
+    masm.branchTestDouble(Assembler::NotEqual, box, ool->entry());
+    masm.unboxDouble(box, resultReg);
+    if (lir->type() == MIRType_Float32)
+        masm.convertDoubleToFloat32(resultReg, resultReg);
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitOutOfLineUnboxFloatingPoint(OutOfLineUnboxFloatingPoint *ool)
+{
+    LUnboxFloatingPoint *ins = ool->unboxFloatingPoint();
+    const ValueOperand value = ToValue(ins, LUnboxFloatingPoint::Input);
+
+    if (ins->mir()->fallible()) {
+        Label bail;
+        masm.branchTestInt32(Assembler::NotEqual, value, &bail);
+        if (!bailoutFrom(&bail, ins->snapshot()))
+            return false;
+    }
+    masm.int32ValueToFloatingPoint(value, ToFloatRegister(ins->output()), ins->type());
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*GetPropertyFn)(JSContext *, HandleValue, HandlePropertyName, MutableHandleValue);
+static const VMFunction GetPropertyInfo = FunctionInfo<GetPropertyFn>(GetProperty);
+static const VMFunction CallPropertyInfo = FunctionInfo<GetPropertyFn>(CallProperty);
+
+bool
+CodeGenerator::visitCallGetProperty(LCallGetProperty *lir)
+{
+    pushArg(ImmGCPtr(lir->mir()->name()));
+    pushArg(ToValue(lir, LCallGetProperty::Value));
+
+    if (lir->mir()->callprop())
+        return callVM(CallPropertyInfo, lir);
+    return callVM(GetPropertyInfo, lir);
+}
+
+typedef bool (*GetOrCallElementFn)(JSContext *, MutableHandleValue, HandleValue, MutableHandleValue);
+static const VMFunction GetElementInfo = FunctionInfo<GetOrCallElementFn>(js::GetElement);
+static const VMFunction CallElementInfo = FunctionInfo<GetOrCallElementFn>(js::CallElement);
+
+bool
+CodeGenerator::visitCallGetElement(LCallGetElement *lir)
+{
+    pushArg(ToValue(lir, LCallGetElement::RhsInput));
+    pushArg(ToValue(lir, LCallGetElement::LhsInput));
+
+    JSOp op = JSOp(*lir->mir()->resumePoint()->pc());
+
+    if (op == JSOP_GETELEM) {
+        return callVM(GetElementInfo, lir);
+    } else {
+        JS_ASSERT(op == JSOP_CALLELEM);
+        return callVM(CallElementInfo, lir);
+    }
+}
+
+typedef bool (*SetObjectElementFn)(JSContext *, HandleObject, HandleValue, HandleValue,
+                                   bool strict);
+typedef bool (*SetElementParFn)(ForkJoinContext *, HandleObject, HandleValue, HandleValue, bool);
+static const VMFunctionsModal SetObjectElementInfo = VMFunctionsModal(
+    FunctionInfo<SetObjectElementFn>(SetObjectElement),
+    FunctionInfo<SetElementParFn>(SetElementPar));
+
+bool
+CodeGenerator::visitCallSetElement(LCallSetElement *lir)
+{
+    pushArg(Imm32(current->mir()->strict()));
+    pushArg(ToValue(lir, LCallSetElement::Value));
+    pushArg(ToValue(lir, LCallSetElement::Index));
+    pushArg(ToRegister(lir->getOperand(0)));
+    return callVM(SetObjectElementInfo, lir);
+}
+
+typedef bool (*InitElementArrayFn)(JSContext *, jsbytecode *, HandleObject, uint32_t, HandleValue);
+static const VMFunction InitElementArrayInfo = FunctionInfo<InitElementArrayFn>(js::InitElementArray);
+
+bool
+CodeGenerator::visitCallInitElementArray(LCallInitElementArray *lir)
+{
+    pushArg(ToValue(lir, LCallInitElementArray::Value));
+    pushArg(Imm32(lir->mir()->index()));
+    pushArg(ToRegister(lir->getOperand(0)));
+    pushArg(ImmPtr(lir->mir()->resumePoint()->pc()));
+    return callVM(InitElementArrayInfo, lir);
+}
+
+bool
+CodeGenerator::visitLoadFixedSlotV(LLoadFixedSlotV *ins)
+{
+    const Register obj = ToRegister(ins->getOperand(0));
+    size_t slot = ins->mir()->slot();
+    ValueOperand result = GetValueOutput(ins);
+
+    masm.loadValue(Address(obj, JSObject::getFixedSlotOffset(slot)), result);
+    return true;
+}
+
+bool
+CodeGenerator::visitLoadFixedSlotT(LLoadFixedSlotT *ins)
+{
+    const Register obj = ToRegister(ins->getOperand(0));
+    size_t slot = ins->mir()->slot();
+    AnyRegister result = ToAnyRegister(ins->getDef(0));
+    MIRType type = ins->mir()->type();
+
+    masm.loadUnboxedValue(Address(obj, JSObject::getFixedSlotOffset(slot)), type, result);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitStoreFixedSlotV(LStoreFixedSlotV *ins)
+{
+    const Register obj = ToRegister(ins->getOperand(0));
+    size_t slot = ins->mir()->slot();
+
+    const ValueOperand value = ToValue(ins, LStoreFixedSlotV::Value);
+
+    Address address(obj, JSObject::getFixedSlotOffset(slot));
+    if (ins->mir()->needsBarrier())
+        emitPreBarrier(address, MIRType_Value);
+
+    masm.storeValue(value, address);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitStoreFixedSlotT(LStoreFixedSlotT *ins)
+{
+    const Register obj = ToRegister(ins->getOperand(0));
+    size_t slot = ins->mir()->slot();
+
+    const LAllocation *value = ins->value();
+    MIRType valueType = ins->mir()->value()->type();
+
+    ConstantOrRegister nvalue = value->isConstant()
+                              ? ConstantOrRegister(*value->toConstant())
+                              : TypedOrValueRegister(valueType, ToAnyRegister(value));
+
+    Address address(obj, JSObject::getFixedSlotOffset(slot));
+    if (ins->mir()->needsBarrier())
+        emitPreBarrier(address, MIRType_Value);
+
+    masm.storeConstantOrRegister(nvalue, address);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitCallsiteCloneCache(LCallsiteCloneCache *ins)
+{
+    const MCallsiteCloneCache *mir = ins->mir();
+    Register callee = ToRegister(ins->callee());
+    Register output = ToRegister(ins->output());
+
+    CallsiteCloneIC cache(callee, mir->block()->info().script(), mir->callPc(), output);
+    return addCache(ins, allocateCache(cache));
+}
+
+typedef JSObject *(*CallsiteCloneICFn)(JSContext *, size_t, HandleObject);
+const VMFunction CallsiteCloneIC::UpdateInfo =
+    FunctionInfo<CallsiteCloneICFn>(CallsiteCloneIC::update);
+
+bool
+CodeGenerator::visitCallsiteCloneIC(OutOfLineUpdateCache *ool, DataPtr<CallsiteCloneIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->calleeReg());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(CallsiteCloneIC::UpdateInfo, lir))
+        return false;
+    StoreRegisterTo(ic->outputReg()).generate(this);
+    restoreLiveIgnore(lir, StoreRegisterTo(ic->outputReg()).clobbered());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitGetNameCache(LGetNameCache *ins)
+{
+    RegisterSet liveRegs = ins->safepoint()->liveRegs();
+    Register scopeChain = ToRegister(ins->scopeObj());
+    TypedOrValueRegister output(GetValueOutput(ins));
+    bool isTypeOf = ins->mir()->accessKind() != MGetNameCache::NAME;
+
+    NameIC cache(liveRegs, isTypeOf, scopeChain, ins->mir()->name(), output);
+    return addCache(ins, allocateCache(cache));
+}
+
+typedef bool (*NameICFn)(JSContext *, size_t, HandleObject, MutableHandleValue);
+const VMFunction NameIC::UpdateInfo = FunctionInfo<NameICFn>(NameIC::update);
+
+bool
+CodeGenerator::visitNameIC(OutOfLineUpdateCache *ool, DataPtr<NameIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->scopeChainReg());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(NameIC::UpdateInfo, lir))
+        return false;
+    StoreValueTo(ic->outputReg()).generate(this);
+    restoreLiveIgnore(lir, StoreValueTo(ic->outputReg()).clobbered());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::addGetPropertyCache(LInstruction *ins, RegisterSet liveRegs, Register objReg,
+                                   PropertyName *name, TypedOrValueRegister output,
+                                   bool monitoredResult)
+{
+    switch (gen->info().executionMode()) {
+      case SequentialExecution: {
+        GetPropertyIC cache(liveRegs, objReg, name, output, monitoredResult);
+        return addCache(ins, allocateCache(cache));
+      }
+      case ParallelExecution: {
+        GetPropertyParIC cache(objReg, name, output);
+        return addCache(ins, allocateCache(cache));
+      }
+      default:
+        MOZ_ASSUME_UNREACHABLE("Bad execution mode");
+    }
+}
+
+bool
+CodeGenerator::addSetPropertyCache(LInstruction *ins, RegisterSet liveRegs, Register objReg,
+                                   PropertyName *name, ConstantOrRegister value, bool strict,
+                                   bool needsTypeBarrier)
+{
+    switch (gen->info().executionMode()) {
+      case SequentialExecution: {
+          SetPropertyIC cache(liveRegs, objReg, name, value, strict, needsTypeBarrier);
+          return addCache(ins, allocateCache(cache));
+      }
+      case ParallelExecution: {
+          SetPropertyParIC cache(objReg, name, value, strict, needsTypeBarrier);
+          return addCache(ins, allocateCache(cache));
+      }
+      default:
+        MOZ_ASSUME_UNREACHABLE("Bad execution mode");
+    }
+}
+
+bool
+CodeGenerator::addSetElementCache(LInstruction *ins, Register obj, Register unboxIndex,
+                                  Register temp, FloatRegister tempFloat, ValueOperand index,
+                                  ConstantOrRegister value, bool strict, bool guardHoles)
+{
+    switch (gen->info().executionMode()) {
+      case SequentialExecution: {
+        SetElementIC cache(obj, unboxIndex, temp, tempFloat, index, value, strict,
+                           guardHoles);
+        return addCache(ins, allocateCache(cache));
+      }
+      case ParallelExecution: {
+        SetElementParIC cache(obj, unboxIndex, temp, tempFloat, index, value, strict,
+                              guardHoles);
+        return addCache(ins, allocateCache(cache));
+      }
+      default:
+        MOZ_ASSUME_UNREACHABLE("Bad execution mode");
+    }
+}
+
+bool
+CodeGenerator::visitGetPropertyCacheV(LGetPropertyCacheV *ins)
+{
+    RegisterSet liveRegs = ins->safepoint()->liveRegs();
+    Register objReg = ToRegister(ins->getOperand(0));
+    PropertyName *name = ins->mir()->name();
+    bool monitoredResult = ins->mir()->monitoredResult();
+    TypedOrValueRegister output = TypedOrValueRegister(GetValueOutput(ins));
+
+    return addGetPropertyCache(ins, liveRegs, objReg, name, output, monitoredResult);
+}
+
+bool
+CodeGenerator::visitGetPropertyCacheT(LGetPropertyCacheT *ins)
+{
+    RegisterSet liveRegs = ins->safepoint()->liveRegs();
+    Register objReg = ToRegister(ins->getOperand(0));
+    PropertyName *name = ins->mir()->name();
+    bool monitoredResult = ins->mir()->monitoredResult();
+    TypedOrValueRegister output(ins->mir()->type(), ToAnyRegister(ins->getDef(0)));
+
+    return addGetPropertyCache(ins, liveRegs, objReg, name, output, monitoredResult);
+}
+
+typedef bool (*GetPropertyICFn)(JSContext *, size_t, HandleObject, MutableHandleValue);
+const VMFunction GetPropertyIC::UpdateInfo =
+    FunctionInfo<GetPropertyICFn>(GetPropertyIC::update);
+
+bool
+CodeGenerator::visitGetPropertyIC(OutOfLineUpdateCache *ool, DataPtr<GetPropertyIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+
+    if (ic->idempotent()) {
+        size_t numLocs;
+        CacheLocationList &cacheLocs = lir->mirRaw()->toGetPropertyCache()->location();
+        size_t locationBase = addCacheLocations(cacheLocs, &numLocs);
+        ic->setLocationInfo(locationBase, numLocs);
+    }
+
+    saveLive(lir);
+
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(GetPropertyIC::UpdateInfo, lir))
+        return false;
+    StoreValueTo(ic->output()).generate(this);
+    restoreLiveIgnore(lir, StoreValueTo(ic->output()).clobbered());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*GetPropertyParICFn)(ForkJoinContext *, size_t, HandleObject, MutableHandleValue);
+const VMFunction GetPropertyParIC::UpdateInfo =
+    FunctionInfo<GetPropertyParICFn>(GetPropertyParIC::update);
+
+bool
+CodeGenerator::visitGetPropertyParIC(OutOfLineUpdateCache *ool, DataPtr<GetPropertyParIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(GetPropertyParIC::UpdateInfo, lir))
+        return false;
+    StoreValueTo(ic->output()).generate(this);
+    restoreLiveIgnore(lir, StoreValueTo(ic->output()).clobbered());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::addGetElementCache(LInstruction *ins, Register obj, ConstantOrRegister index,
+                                  TypedOrValueRegister output, bool monitoredResult,
+                                  bool allowDoubleResult)
+{
+    switch (gen->info().executionMode()) {
+      case SequentialExecution: {
+        RegisterSet liveRegs = ins->safepoint()->liveRegs();
+        GetElementIC cache(liveRegs, obj, index, output, monitoredResult, allowDoubleResult);
+        return addCache(ins, allocateCache(cache));
+      }
+      case ParallelExecution: {
+        GetElementParIC cache(obj, index, output, monitoredResult, allowDoubleResult);
+        return addCache(ins, allocateCache(cache));
+      }
+      default:
+        MOZ_ASSUME_UNREACHABLE("No such execution mode");
+    }
+}
+
+bool
+CodeGenerator::visitGetElementCacheV(LGetElementCacheV *ins)
+{
+    Register obj = ToRegister(ins->object());
+    ConstantOrRegister index = TypedOrValueRegister(ToValue(ins, LGetElementCacheV::Index));
+    TypedOrValueRegister output = TypedOrValueRegister(GetValueOutput(ins));
+    const MGetElementCache *mir = ins->mir();
+
+    return addGetElementCache(ins, obj, index, output, mir->monitoredResult(), mir->allowDoubleResult());
+}
+
+bool
+CodeGenerator::visitGetElementCacheT(LGetElementCacheT *ins)
+{
+    Register obj = ToRegister(ins->object());
+    ConstantOrRegister index = TypedOrValueRegister(MIRType_Int32, ToAnyRegister(ins->index()));
+    TypedOrValueRegister output(ins->mir()->type(), ToAnyRegister(ins->output()));
+    const MGetElementCache *mir = ins->mir();
+
+    return addGetElementCache(ins, obj, index, output, mir->monitoredResult(), mir->allowDoubleResult());
+}
+
+typedef bool (*GetElementICFn)(JSContext *, size_t, HandleObject, HandleValue, MutableHandleValue);
+const VMFunction GetElementIC::UpdateInfo =
+    FunctionInfo<GetElementICFn>(GetElementIC::update);
+
+bool
+CodeGenerator::visitGetElementIC(OutOfLineUpdateCache *ool, DataPtr<GetElementIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->index());
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(GetElementIC::UpdateInfo, lir))
+        return false;
+    StoreValueTo(ic->output()).generate(this);
+    restoreLiveIgnore(lir, StoreValueTo(ic->output()).clobbered());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitSetElementCacheV(LSetElementCacheV *ins)
+{
+    Register obj = ToRegister(ins->object());
+    Register unboxIndex = ToTempUnboxRegister(ins->tempToUnboxIndex());
+    Register temp = ToRegister(ins->temp());
+    FloatRegister tempFloat = ToFloatRegister(ins->tempFloat());
+    ValueOperand index = ToValue(ins, LSetElementCacheV::Index);
+    ConstantOrRegister value = TypedOrValueRegister(ToValue(ins, LSetElementCacheV::Value));
+
+    return addSetElementCache(ins, obj, unboxIndex, temp, tempFloat, index, value,
+                              ins->mir()->strict(), ins->mir()->guardHoles());
+}
+
+bool
+CodeGenerator::visitSetElementCacheT(LSetElementCacheT *ins)
+{
+    Register obj = ToRegister(ins->object());
+    Register unboxIndex = ToTempUnboxRegister(ins->tempToUnboxIndex());
+    Register temp = ToRegister(ins->temp());
+    FloatRegister tempFloat = ToFloatRegister(ins->tempFloat());
+    ValueOperand index = ToValue(ins, LSetElementCacheT::Index);
+    ConstantOrRegister value;
+    const LAllocation *tmp = ins->value();
+    if (tmp->isConstant())
+        value = *tmp->toConstant();
+    else
+        value = TypedOrValueRegister(ins->mir()->value()->type(), ToAnyRegister(tmp));
+
+    return addSetElementCache(ins, obj, unboxIndex, temp, tempFloat, index, value,
+                              ins->mir()->strict(), ins->mir()->guardHoles());
+}
+
+typedef bool (*SetElementICFn)(JSContext *, size_t, HandleObject, HandleValue, HandleValue);
+const VMFunction SetElementIC::UpdateInfo =
+    FunctionInfo<SetElementICFn>(SetElementIC::update);
+
+bool
+CodeGenerator::visitSetElementIC(OutOfLineUpdateCache *ool, DataPtr<SetElementIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->value());
+    pushArg(ic->index());
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(SetElementIC::UpdateInfo, lir))
+        return false;
+    restoreLive(lir);
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*SetElementParICFn)(ForkJoinContext *, size_t, HandleObject, HandleValue, HandleValue);
+const VMFunction SetElementParIC::UpdateInfo =
+    FunctionInfo<SetElementParICFn>(SetElementParIC::update);
+
+bool
+CodeGenerator::visitSetElementParIC(OutOfLineUpdateCache *ool, DataPtr<SetElementParIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->value());
+    pushArg(ic->index());
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(SetElementParIC::UpdateInfo, lir))
+        return false;
+    restoreLive(lir);
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*GetElementParICFn)(ForkJoinContext *, size_t, HandleObject, HandleValue,
+                                  MutableHandleValue);
+const VMFunction GetElementParIC::UpdateInfo =
+    FunctionInfo<GetElementParICFn>(GetElementParIC::update);
+
+bool
+CodeGenerator::visitGetElementParIC(OutOfLineUpdateCache *ool, DataPtr<GetElementParIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->index());
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(GetElementParIC::UpdateInfo, lir))
+        return false;
+    StoreValueTo(ic->output()).generate(this);
+    restoreLiveIgnore(lir, StoreValueTo(ic->output()).clobbered());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitBindNameCache(LBindNameCache *ins)
+{
+    Register scopeChain = ToRegister(ins->scopeChain());
+    Register output = ToRegister(ins->output());
+    BindNameIC cache(scopeChain, ins->mir()->name(), output);
+
+    return addCache(ins, allocateCache(cache));
+}
+
+typedef JSObject *(*BindNameICFn)(JSContext *, size_t, HandleObject);
+const VMFunction BindNameIC::UpdateInfo =
+    FunctionInfo<BindNameICFn>(BindNameIC::update);
+
+bool
+CodeGenerator::visitBindNameIC(OutOfLineUpdateCache *ool, DataPtr<BindNameIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->scopeChainReg());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(BindNameIC::UpdateInfo, lir))
+        return false;
+    StoreRegisterTo(ic->outputReg()).generate(this);
+    restoreLiveIgnore(lir, StoreRegisterTo(ic->outputReg()).clobbered());
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*SetPropertyFn)(JSContext *, HandleObject,
+                              HandlePropertyName, const HandleValue, bool, jsbytecode *);
+typedef bool (*SetPropertyParFn)(ForkJoinContext *, HandleObject,
+                                 HandlePropertyName, const HandleValue, bool, jsbytecode *);
+static const VMFunctionsModal SetPropertyInfo = VMFunctionsModal(
+    FunctionInfo<SetPropertyFn>(SetProperty),
+    FunctionInfo<SetPropertyParFn>(SetPropertyPar));
+
+bool
+CodeGenerator::visitCallSetProperty(LCallSetProperty *ins)
+{
+    ConstantOrRegister value = TypedOrValueRegister(ToValue(ins, LCallSetProperty::Value));
+
+    const Register objReg = ToRegister(ins->getOperand(0));
+
+    pushArg(ImmPtr(ins->mir()->resumePoint()->pc()));
+    pushArg(Imm32(ins->mir()->strict()));
+
+    pushArg(value);
+    pushArg(ImmGCPtr(ins->mir()->name()));
+    pushArg(objReg);
+
+    return callVM(SetPropertyInfo, ins);
+}
+
+typedef bool (*DeletePropertyFn)(JSContext *, HandleValue, HandlePropertyName, bool *);
+static const VMFunction DeletePropertyStrictInfo =
+    FunctionInfo<DeletePropertyFn>(DeleteProperty<true>);
+static const VMFunction DeletePropertyNonStrictInfo =
+    FunctionInfo<DeletePropertyFn>(DeleteProperty<false>);
+
+bool
+CodeGenerator::visitCallDeleteProperty(LCallDeleteProperty *lir)
+{
+    pushArg(ImmGCPtr(lir->mir()->name()));
+    pushArg(ToValue(lir, LCallDeleteProperty::Value));
+
+    if (lir->mir()->block()->info().script()->strict())
+        return callVM(DeletePropertyStrictInfo, lir);
+
+    return callVM(DeletePropertyNonStrictInfo, lir);
+}
+
+typedef bool (*DeleteElementFn)(JSContext *, HandleValue, HandleValue, bool *);
+static const VMFunction DeleteElementStrictInfo =
+    FunctionInfo<DeleteElementFn>(DeleteElement<true>);
+static const VMFunction DeleteElementNonStrictInfo =
+    FunctionInfo<DeleteElementFn>(DeleteElement<false>);
+
+bool
+CodeGenerator::visitCallDeleteElement(LCallDeleteElement *lir)
+{
+    pushArg(ToValue(lir, LCallDeleteElement::Index));
+    pushArg(ToValue(lir, LCallDeleteElement::Value));
+
+    if (lir->mir()->block()->info().script()->strict())
+        return callVM(DeleteElementStrictInfo, lir);
+
+    return callVM(DeleteElementNonStrictInfo, lir);
+}
+
+bool
+CodeGenerator::visitSetPropertyCacheV(LSetPropertyCacheV *ins)
+{
+    RegisterSet liveRegs = ins->safepoint()->liveRegs();
+    Register objReg = ToRegister(ins->getOperand(0));
+    ConstantOrRegister value = TypedOrValueRegister(ToValue(ins, LSetPropertyCacheV::Value));
+
+    return addSetPropertyCache(ins, liveRegs, objReg, ins->mir()->name(), value,
+                               ins->mir()->strict(), ins->mir()->needsTypeBarrier());
+}
+
+bool
+CodeGenerator::visitSetPropertyCacheT(LSetPropertyCacheT *ins)
+{
+    RegisterSet liveRegs = ins->safepoint()->liveRegs();
+    Register objReg = ToRegister(ins->getOperand(0));
+    ConstantOrRegister value;
+
+    if (ins->getOperand(1)->isConstant())
+        value = ConstantOrRegister(*ins->getOperand(1)->toConstant());
+    else
+        value = TypedOrValueRegister(ins->valueType(), ToAnyRegister(ins->getOperand(1)));
+
+    return addSetPropertyCache(ins, liveRegs, objReg, ins->mir()->name(), value,
+                               ins->mir()->strict(), ins->mir()->needsTypeBarrier());
+}
+
+typedef bool (*SetPropertyICFn)(JSContext *, size_t, HandleObject, HandleValue);
+const VMFunction SetPropertyIC::UpdateInfo =
+    FunctionInfo<SetPropertyICFn>(SetPropertyIC::update);
+
+bool
+CodeGenerator::visitSetPropertyIC(OutOfLineUpdateCache *ool, DataPtr<SetPropertyIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->value());
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(SetPropertyIC::UpdateInfo, lir))
+        return false;
+    restoreLive(lir);
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*SetPropertyParICFn)(ForkJoinContext *, size_t, HandleObject, HandleValue);
+const VMFunction SetPropertyParIC::UpdateInfo =
+    FunctionInfo<SetPropertyParICFn>(SetPropertyParIC::update);
+
+bool
+CodeGenerator::visitSetPropertyParIC(OutOfLineUpdateCache *ool, DataPtr<SetPropertyParIC> &ic)
+{
+    LInstruction *lir = ool->lir();
+    saveLive(lir);
+
+    pushArg(ic->value());
+    pushArg(ic->object());
+    pushArg(Imm32(ool->getCacheIndex()));
+    if (!callVM(SetPropertyParIC::UpdateInfo, lir))
+        return false;
+    restoreLive(lir);
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*ThrowFn)(JSContext *, HandleValue);
+static const VMFunction ThrowInfoCodeGen = FunctionInfo<ThrowFn>(js::Throw);
+
+bool
+CodeGenerator::visitThrow(LThrow *lir)
+{
+    pushArg(ToValue(lir, LThrow::Value));
+    return callVM(ThrowInfoCodeGen, lir);
+}
+
+typedef bool (*BitNotFn)(JSContext *, HandleValue, int *p);
+typedef bool (*BitNotParFn)(ForkJoinContext *, HandleValue, int32_t *);
+static const VMFunctionsModal BitNotInfo = VMFunctionsModal(
+    FunctionInfo<BitNotFn>(BitNot),
+    FunctionInfo<BitNotParFn>(BitNotPar));
+
+bool
+CodeGenerator::visitBitNotV(LBitNotV *lir)
+{
+    pushArg(ToValue(lir, LBitNotV::Input));
+    return callVM(BitNotInfo, lir);
+}
+
+typedef bool (*BitopFn)(JSContext *, HandleValue, HandleValue, int *p);
+typedef bool (*BitopParFn)(ForkJoinContext *, HandleValue, HandleValue, int32_t *);
+static const VMFunctionsModal BitAndInfo = VMFunctionsModal(
+    FunctionInfo<BitopFn>(BitAnd),
+    FunctionInfo<BitopParFn>(BitAndPar));
+static const VMFunctionsModal BitOrInfo = VMFunctionsModal(
+    FunctionInfo<BitopFn>(BitOr),
+    FunctionInfo<BitopParFn>(BitOrPar));
+static const VMFunctionsModal BitXorInfo = VMFunctionsModal(
+    FunctionInfo<BitopFn>(BitXor),
+    FunctionInfo<BitopParFn>(BitXorPar));
+static const VMFunctionsModal BitLhsInfo = VMFunctionsModal(
+    FunctionInfo<BitopFn>(BitLsh),
+    FunctionInfo<BitopParFn>(BitLshPar));
+static const VMFunctionsModal BitRhsInfo = VMFunctionsModal(
+    FunctionInfo<BitopFn>(BitRsh),
+    FunctionInfo<BitopParFn>(BitRshPar));
+
+bool
+CodeGenerator::visitBitOpV(LBitOpV *lir)
+{
+    pushArg(ToValue(lir, LBitOpV::RhsInput));
+    pushArg(ToValue(lir, LBitOpV::LhsInput));
+
+    switch (lir->jsop()) {
+      case JSOP_BITAND:
+        return callVM(BitAndInfo, lir);
+      case JSOP_BITOR:
+        return callVM(BitOrInfo, lir);
+      case JSOP_BITXOR:
+        return callVM(BitXorInfo, lir);
+      case JSOP_LSH:
+        return callVM(BitLhsInfo, lir);
+      case JSOP_RSH:
+        return callVM(BitRhsInfo, lir);
+      default:
+        break;
+    }
+    MOZ_ASSUME_UNREACHABLE("unexpected bitop");
+}
+
+class OutOfLineTypeOfV : public OutOfLineCodeBase<CodeGenerator>
+{
+    LTypeOfV *ins_;
+
+  public:
+    OutOfLineTypeOfV(LTypeOfV *ins)
+      : ins_(ins)
+    { }
+
+    bool accept(CodeGenerator *codegen) {
+        return codegen->visitOutOfLineTypeOfV(this);
+    }
+    LTypeOfV *ins() const {
+        return ins_;
+    }
+};
+
+bool
+CodeGenerator::visitTypeOfV(LTypeOfV *lir)
+{
+    const ValueOperand value = ToValue(lir, LTypeOfV::Input);
+    Register output = ToRegister(lir->output());
+    Register tag = masm.splitTagForTest(value);
+
+    const JSAtomState &names = GetIonContext()->runtime->names();
+    Label done;
+
+    OutOfLineTypeOfV *ool = nullptr;
+    if (lir->mir()->inputMaybeCallableOrEmulatesUndefined()) {
+        // The input may be a callable object (result is "function") or may
+        // emulate undefined (result is "undefined"). Use an OOL path.
+        ool = new(alloc()) OutOfLineTypeOfV(lir);
+        if (!addOutOfLineCode(ool))
+            return false;
+
+        masm.branchTestObject(Assembler::Equal, tag, ool->entry());
+    } else {
+        // Input is not callable and does not emulate undefined, so if
+        // it's an object the result is always "object".
+        Label notObject;
+        masm.branchTestObject(Assembler::NotEqual, tag, &notObject);
+        masm.movePtr(ImmGCPtr(names.object), output);
+        masm.jump(&done);
+        masm.bind(&notObject);
+    }
+
+    Label notNumber;
+    masm.branchTestNumber(Assembler::NotEqual, tag, &notNumber);
+    masm.movePtr(ImmGCPtr(names.number), output);
+    masm.jump(&done);
+    masm.bind(&notNumber);
+
+    Label notUndefined;
+    masm.branchTestUndefined(Assembler::NotEqual, tag, &notUndefined);
+    masm.movePtr(ImmGCPtr(names.undefined), output);
+    masm.jump(&done);
+    masm.bind(&notUndefined);
+
+    Label notNull;
+    masm.branchTestNull(Assembler::NotEqual, tag, &notNull);
+    masm.movePtr(ImmGCPtr(names.object), output);
+    masm.jump(&done);
+    masm.bind(&notNull);
+
+    Label notBoolean;
+    masm.branchTestBoolean(Assembler::NotEqual, tag, &notBoolean);
+    masm.movePtr(ImmGCPtr(names.boolean), output);
+    masm.jump(&done);
+    masm.bind(&notBoolean);
+
+    masm.movePtr(ImmGCPtr(names.string), output);
+
+    masm.bind(&done);
+    if (ool)
+        masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitOutOfLineTypeOfV(OutOfLineTypeOfV *ool)
+{
+    LTypeOfV *ins = ool->ins();
+
+    ValueOperand input = ToValue(ins, LTypeOfV::Input);
+    Register temp = ToTempUnboxRegister(ins->tempToUnbox());
+    Register output = ToRegister(ins->output());
+
+    Register obj = masm.extractObject(input, temp);
+
+    saveVolatile(output);
+    masm.setupUnalignedABICall(2, output);
+    masm.passABIArg(obj);
+    masm.movePtr(ImmPtr(GetIonContext()->runtime), output);
+    masm.passABIArg(output);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, js::TypeOfObjectOperation));
+    masm.storeCallResult(output);
+    restoreVolatile(output);
+
+    masm.jump(ool->rejoin());
+    return true;
+}
+
+typedef bool (*ToIdFn)(JSContext *, HandleScript, jsbytecode *, HandleValue, HandleValue,
+                       MutableHandleValue);
+static const VMFunction ToIdInfo = FunctionInfo<ToIdFn>(ToIdOperation);
+
+bool
+CodeGenerator::visitToIdV(LToIdV *lir)
+{
+    Label notInt32;
+    FloatRegister temp = ToFloatRegister(lir->tempFloat());
+    const ValueOperand out = ToOutValue(lir);
+    ValueOperand index = ToValue(lir, LToIdV::Index);
+
+    OutOfLineCode *ool = oolCallVM(ToIdInfo, lir,
+                                   (ArgList(),
+                                   ImmGCPtr(current->mir()->info().script()),
+                                   ImmPtr(lir->mir()->resumePoint()->pc()),
+                                   ToValue(lir, LToIdV::Object),
+                                   ToValue(lir, LToIdV::Index)),
+                                   StoreValueTo(out));
+
+    Register tag = masm.splitTagForTest(index);
+
+    masm.branchTestInt32(Assembler::NotEqual, tag, &notInt32);
+    masm.moveValue(index, out);
+    masm.jump(ool->rejoin());
+
+    masm.bind(&notInt32);
+    masm.branchTestDouble(Assembler::NotEqual, tag, ool->entry());
+    masm.unboxDouble(index, temp);
+    masm.convertDoubleToInt32(temp, out.scratchReg(), ool->entry(), true);
+    masm.tagValue(JSVAL_TYPE_INT32, out.scratchReg(), out);
+
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+bool
+CodeGenerator::visitLoadElementV(LLoadElementV *load)
+{
+    Register elements = ToRegister(load->elements());
+    const ValueOperand out = ToOutValue(load);
+
+    if (load->index()->isConstant())
+        masm.loadValue(Address(elements, ToInt32(load->index()) * sizeof(Value)), out);
+    else
+        masm.loadValue(BaseIndex(elements, ToRegister(load->index()), TimesEight), out);
+
+    if (load->mir()->needsHoleCheck()) {
+        Label testMagic;
+        masm.branchTestMagic(Assembler::Equal, out, &testMagic);
+        if (!bailoutFrom(&testMagic, load->snapshot()))
+            return false;
+    }
+
+    return true;
+}
+
+bool
+CodeGenerator::visitLoadElementHole(LLoadElementHole *lir)
+{
+    Register elements = ToRegister(lir->elements());
+    Register initLength = ToRegister(lir->initLength());
+    const ValueOperand out = ToOutValue(lir);
+
+    const MLoadElementHole *mir = lir->mir();
+
+    // If the index is out of bounds, load |undefined|. Otherwise, load the
+    // value.
+    Label undefined, done;
+    if (lir->index()->isConstant()) {
+        masm.branch32(Assembler::BelowOrEqual, initLength, Imm32(ToInt32(lir->index())), &undefined);
+        masm.loadValue(Address(elements, ToInt32(lir->index()) * sizeof(Value)), out);
+    } else {
+        masm.branch32(Assembler::BelowOrEqual, initLength, ToRegister(lir->index()), &undefined);
+        masm.loadValue(BaseIndex(elements, ToRegister(lir->index()), TimesEight), out);
+    }
+
+    // If a hole check is needed, and the value wasn't a hole, we're done.
+    // Otherwise, we'll load undefined.
+    if (lir->mir()->needsHoleCheck())
+        masm.branchTestMagic(Assembler::NotEqual, out, &done);
+    else
+        masm.jump(&done);
+
+    masm.bind(&undefined);
+
+    if (mir->needsNegativeIntCheck()) {
+        if (lir->index()->isConstant()) {
+            if (ToInt32(lir->index()) < 0 && !bailout(lir->snapshot()))
+                return false;
+        } else {
+            Label negative;
+            masm.branch32(Assembler::LessThan, ToRegister(lir->index()), Imm32(0), &negative);
+            if (!bailoutFrom(&negative, lir->snapshot()))
+                return false;
+        }
+    }
+
+    masm.moveValue(UndefinedValue(), out);
+    masm.bind(&done);
+    return true;
+}
+
+bool
+CodeGenerator::visitLoadTypedArrayElement(LLoadTypedArrayElement *lir)
+{
+    Register elements = ToRegister(lir->elements());
+    Register temp = lir->temp()->isBogusTemp() ? InvalidReg : ToRegister(lir->temp());
+    AnyRegister out = ToAnyRegister(lir->output());
+
+    int arrayType = lir->mir()->arrayType();
+    int width = TypedArrayObject::slotWidth(arrayType);
+
+    Label fail;
+    if (lir->index()->isConstant()) {
+        Address source(elements, ToInt32(lir->index()) * width);
+        masm.loadFromTypedArray(arrayType, source, out, temp, &fail);
+    } else {
+        BaseIndex source(elements, ToRegister(lir->index()), ScaleFromElemWidth(width));
+        masm.loadFromTypedArray(arrayType, source, out, temp, &fail);
+    }
+
+    if (fail.used() && !bailoutFrom(&fail, lir->snapshot()))
+        return false;
+
+    return true;
+}
+
+bool
+CodeGenerator::visitLoadTypedArrayElementHole(LLoadTypedArrayElementHole *lir)
+{
+    Register object = ToRegister(lir->object());
+    const ValueOperand out = ToOutValue(lir);
+
+    // Load the length.
+    Register scratch = out.scratchReg();
+    Int32Key key = ToInt32Key(lir->index());
+    masm.unboxInt32(Address(object, TypedArrayObject::lengthOffset()), scratch);
+
+    // Load undefined unless length > key.
+    Label inbounds, done;
+    masm.branchKey(Assembler::Above, scratch, key, &inbounds);
+    masm.moveValue(UndefinedValue(), out);
+    masm.jump(&done);
+
+    // Load the elements vector.
+    masm.bind(&inbounds);
+    masm.loadPtr(Address(object, TypedArrayObject::dataOffset()), scratch);
+
+    int arrayType = lir->mir()->arrayType();
+    int width = TypedArrayObject::slotWidth(arrayType);
+
+    Label fail;
+    if (key.isConstant()) {
+        Address source(scratch, key.constant() * width);
+        masm.loadFromTypedArray(arrayType, source, out, lir->mir()->allowDouble(),
+                                out.scratchReg(), &fail);
+    } else {
+        BaseIndex source(scratch, key.reg(), ScaleFromElemWidth(width));
+        masm.loadFromTypedArray(arrayType, source, out, lir->mir()->allowDouble(),
+                                out.scratchReg(), &fail);
+    }
+
+    if (fail.used() && !bailoutFrom(&fail, lir->snapshot()))
+        return false;
+
+    masm.bind(&done);
+    return true;
+}
+
+template <typename T>
+static inline void
+StoreToTypedArray(MacroAssembler &masm, int arrayType, const LAllocation *value, const T &dest)
+{
+    if (arrayType == ScalarTypeDescr::TYPE_FLOAT32 ||
+        arrayType == ScalarTypeDescr::TYPE_FLOAT64)
+    {
+        masm.storeToTypedFloatArray(arrayType, ToFloatRegister(value), dest);
+    } else {
+        if (value->isConstant())
+            masm.storeToTypedIntArray(arrayType, Imm32(ToInt32(value)), dest);
+        else
+            masm.storeToTypedIntArray(arrayType, ToRegister(value), dest);
+    }
+}
+
+bool
+CodeGenerator::visitStoreTypedArrayElement(LStoreTypedArrayElement *lir)
+{
+    Register elements = ToRegister(lir->elements());
+    const LAllocation *value = lir->value();
+
+    int arrayType = lir->mir()->arrayType();
+    int width = TypedArrayObject::slotWidth(arrayType);
+
+    if (lir->index()->isConstant()) {
+        Address dest(elements, ToInt32(lir->index()) * width);
+        StoreToTypedArray(masm, arrayType, value, dest);
+    } else {
+        BaseIndex dest(elements, ToRegister(lir->index()), ScaleFromElemWidth(width));
+        StoreToTypedArray(masm, arrayType, value, dest);
+    }
+
+    return true;
+}
+
+bool
+CodeGenerator::visitStoreTypedArrayElementHole(LStoreTypedArrayElementHole *lir)
+{
+    Register elements = ToRegister(lir->elements());
+    const LAllocation *value = lir->value();
+
+    int arrayType = lir->mir()->arrayType();
+    int width = TypedArrayObject::slotWidth(arrayType);
+
+    bool guardLength = true;
+    if (lir->index()->isConstant() && lir->length()->isConstant()) {
+        uint32_t idx = ToInt32(lir->index());
+        uint32_t len = ToInt32(lir->length());
+        if (idx >= len)
+            return true;
+        guardLength = false;
+    }
+    Label skip;
+    if (lir->index()->isConstant()) {
+        uint32_t idx = ToInt32(lir->index());
+        if (guardLength)
+            masm.branch32(Assembler::BelowOrEqual, ToOperand(lir->length()), Imm32(idx), &skip);
+        Address dest(elements, idx * width);
+        StoreToTypedArray(masm, arrayType, value, dest);
+    } else {
+        Register idxReg = ToRegister(lir->index());
+        JS_ASSERT(guardLength);
+        if (lir->length()->isConstant())
+            masm.branch32(Assembler::AboveOrEqual, idxReg, Imm32(ToInt32(lir->length())), &skip);
+        else
+            masm.branch32(Assembler::BelowOrEqual, ToOperand(lir->length()), idxReg, &skip);
+        BaseIndex dest(elements, ToRegister(lir->index()), ScaleFromElemWidth(width));
+        StoreToTypedArray(masm, arrayType, value, dest);
+    }
+    if (guardLength)
+        masm.bind(&skip);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitClampIToUint8(LClampIToUint8 *lir)
+{
+    Register output = ToRegister(lir->output());
+    JS_ASSERT(output == ToRegister(lir->input()));
+    masm.clampIntToUint8(output);
+    return true;
+}
+
+bool
+CodeGenerator::visitClampDToUint8(LClampDToUint8 *lir)
+{
+    FloatRegister input = ToFloatRegister(lir->input());
+    Register output = ToRegister(lir->output());
+    masm.clampDoubleToUint8(input, output);
+    return true;
+}
+
+bool
+CodeGenerator::visitClampVToUint8(LClampVToUint8 *lir)
+{
+    ValueOperand operand = ToValue(lir, LClampVToUint8::Input);
+    FloatRegister tempFloat = ToFloatRegister(lir->tempFloat());
+    Register output = ToRegister(lir->output());
+    MDefinition *input = lir->mir()->input();
+
+    Label *stringEntry, *stringRejoin;
+    if (input->mightBeType(MIRType_String)) {
+        OutOfLineCode *oolString = oolCallVM(StringToNumberInfo, lir, (ArgList(), output),
+                                             StoreFloatRegisterTo(tempFloat));
+        if (!oolString)
+            return false;
+        stringEntry = oolString->entry();
+        stringRejoin = oolString->rejoin();
+    } else {
+        stringEntry = nullptr;
+        stringRejoin = nullptr;
+    }
+
+    Label fails;
+    masm.clampValueToUint8(operand, input,
+                           stringEntry, stringRejoin,
+                           output, tempFloat, output, &fails);
+
+    if (!bailoutFrom(&fails, lir->snapshot()))
+        return false;
+
+    return true;
+}
+
+typedef bool (*OperatorInFn)(JSContext *, HandleValue, HandleObject, bool *);
+static const VMFunction OperatorInInfo = FunctionInfo<OperatorInFn>(OperatorIn);
+
+bool
+CodeGenerator::visitIn(LIn *ins)
+{
+    pushArg(ToRegister(ins->rhs()));
+    pushArg(ToValue(ins, LIn::LHS));
+
+    return callVM(OperatorInInfo, ins);
+}
+
+typedef bool (*OperatorInIFn)(JSContext *, uint32_t, HandleObject, bool *);
+static const VMFunction OperatorInIInfo = FunctionInfo<OperatorInIFn>(OperatorInI);
+
+bool
+CodeGenerator::visitInArray(LInArray *lir)
+{
+    const MInArray *mir = lir->mir();
+    Register elements = ToRegister(lir->elements());
+    Register initLength = ToRegister(lir->initLength());
+    Register output = ToRegister(lir->output());
+
+    // When the array is not packed we need to do a hole check in addition to the bounds check.
+    Label falseBranch, done, trueBranch;
+
+    OutOfLineCode *ool = nullptr;
+    Label* failedInitLength = &falseBranch;
+
+    if (lir->index()->isConstant()) {
+        int32_t index = ToInt32(lir->index());
+
+        JS_ASSERT_IF(index < 0, mir->needsNegativeIntCheck());
+        if (mir->needsNegativeIntCheck()) {
+            ool = oolCallVM(OperatorInIInfo, lir,
+                            (ArgList(), Imm32(index), ToRegister(lir->object())),
+                            StoreRegisterTo(output));
+            failedInitLength = ool->entry();
+        }
+
+        masm.branch32(Assembler::BelowOrEqual, initLength, Imm32(index), failedInitLength);
+        if (mir->needsHoleCheck()) {
+            Address address = Address(elements, index * sizeof(Value));
+            masm.branchTestMagic(Assembler::Equal, address, &falseBranch);
+        }
+    } else {
+        Label negativeIntCheck;
+        Register index = ToRegister(lir->index());
+
+        if (mir->needsNegativeIntCheck())
+            failedInitLength = &negativeIntCheck;
+
+        masm.branch32(Assembler::BelowOrEqual, initLength, index, failedInitLength);
+        if (mir->needsHoleCheck()) {
+            BaseIndex address = BaseIndex(elements, ToRegister(lir->index()), TimesEight);
+            masm.branchTestMagic(Assembler::Equal, address, &falseBranch);
+        }
+        masm.jump(&trueBranch);
+
+        if (mir->needsNegativeIntCheck()) {
+            masm.bind(&negativeIntCheck);
+            ool = oolCallVM(OperatorInIInfo, lir,
+                            (ArgList(), index, ToRegister(lir->object())),
+                            StoreRegisterTo(output));
+
+            masm.branch32(Assembler::LessThan, index, Imm32(0), ool->entry());
+            masm.jump(&falseBranch);
+        }
+    }
+
+    masm.bind(&trueBranch);
+    masm.move32(Imm32(1), output);
+    masm.jump(&done);
+
+    masm.bind(&falseBranch);
+    masm.move32(Imm32(0), output);
+    masm.bind(&done);
+
+    if (ool)
+        masm.bind(ool->rejoin());
+
+    return true;
+}
+
+bool
+CodeGenerator::visitInstanceOfO(LInstanceOfO *ins)
+{
+    return emitInstanceOf(ins, ins->mir()->prototypeObject());
+}
+
+bool
+CodeGenerator::visitInstanceOfV(LInstanceOfV *ins)
+{
+    return emitInstanceOf(ins, ins->mir()->prototypeObject());
+}
+
+// Wrap IsDelegateOfObject, which takes a JSObject*, not a HandleObject
+static bool
+IsDelegateObject(JSContext *cx, HandleObject protoObj, HandleObject obj, bool *res)
+{
+    return IsDelegateOfObject(cx, protoObj, obj, res);
+}
+
+typedef bool (*IsDelegateObjectFn)(JSContext *, HandleObject, HandleObject, bool *);
+static const VMFunction IsDelegateObjectInfo = FunctionInfo<IsDelegateObjectFn>(IsDelegateObject);
+
+bool
+CodeGenerator::emitInstanceOf(LInstruction *ins, JSObject *prototypeObject)
+{
+    // This path implements fun_hasInstance when the function's prototype is
+    // known to be prototypeObject.
+
+    Label done;
+    Register output = ToRegister(ins->getDef(0));
+
+    // If the lhs is a primitive, the result is false.
+    Register objReg;
+    if (ins->isInstanceOfV()) {
+        Label isObject;
+        ValueOperand lhsValue = ToValue(ins, LInstanceOfV::LHS);
+        masm.branchTestObject(Assembler::Equal, lhsValue, &isObject);
+        masm.mov(ImmWord(0), output);
+        masm.jump(&done);
+        masm.bind(&isObject);
+        objReg = masm.extractObject(lhsValue, output);
+    } else {
+        objReg = ToRegister(ins->toInstanceOfO()->lhs());
+    }
+
+    // Crawl the lhs's prototype chain in a loop to search for prototypeObject.
+    // This follows the main loop of js::IsDelegate, though additionally breaks
+    // out of the loop on Proxy::LazyProto.
+
+    // Load the lhs's prototype.
+    masm.loadObjProto(objReg, output);
+
+    Label testLazy;
+    {
+        Label loopPrototypeChain;
+        masm.bind(&loopPrototypeChain);
+
+        // Test for the target prototype object.
+        Label notPrototypeObject;
+        masm.branchPtr(Assembler::NotEqual, output, ImmGCPtr(prototypeObject), &notPrototypeObject);
+        masm.mov(ImmWord(1), output);
+        masm.jump(&done);
+        masm.bind(&notPrototypeObject);
+
+        JS_ASSERT(uintptr_t(TaggedProto::LazyProto) == 1);
+
+        // Test for nullptr or Proxy::LazyProto
+        masm.branchPtr(Assembler::BelowOrEqual, output, ImmWord(1), &testLazy);
+
+        // Load the current object's prototype.
+        masm.loadObjProto(output, output);
+
+        masm.jump(&loopPrototypeChain);
+    }
+
+    // Make a VM call if an object with a lazy proto was found on the prototype
+    // chain. This currently occurs only for cross compartment wrappers, which
+    // we do not expect to be compared with non-wrapper functions from this
+    // compartment. Otherwise, we stopped on a nullptr prototype and the output
+    // register is already correct.
+
+    OutOfLineCode *ool = oolCallVM(IsDelegateObjectInfo, ins,
+                                   (ArgList(), ImmGCPtr(prototypeObject), objReg),
+                                   StoreRegisterTo(output));
+
+    // Regenerate the original lhs object for the VM call.
+    Label regenerate, *lazyEntry;
+    if (objReg != output) {
+        lazyEntry = ool->entry();
+    } else {
+        masm.bind(&regenerate);
+        lazyEntry = &regenerate;
+        if (ins->isInstanceOfV()) {
+            ValueOperand lhsValue = ToValue(ins, LInstanceOfV::LHS);
+            objReg = masm.extractObject(lhsValue, output);
+        } else {
+            objReg = ToRegister(ins->toInstanceOfO()->lhs());
+        }
+        JS_ASSERT(objReg == output);
+        masm.jump(ool->entry());
+    }
+
+    masm.bind(&testLazy);
+    masm.branchPtr(Assembler::Equal, output, ImmWord(1), lazyEntry);
+
+    masm.bind(&done);
+    masm.bind(ool->rejoin());
+    return true;
+}
+
+typedef bool (*HasInstanceFn)(JSContext *, HandleObject, HandleValue, bool *);
+static const VMFunction HasInstanceInfo = FunctionInfo<HasInstanceFn>(js::HasInstance);
+
+bool
+CodeGenerator::visitCallInstanceOf(LCallInstanceOf *ins)
+{
+    ValueOperand lhs = ToValue(ins, LCallInstanceOf::LHS);
+    Register rhs = ToRegister(ins->rhs());
+    JS_ASSERT(ToRegister(ins->output()) == ReturnReg);
+
+    pushArg(lhs);
+    pushArg(rhs);
+    return callVM(HasInstanceInfo, ins);
+}
+
+bool
+CodeGenerator::visitGetDOMProperty(LGetDOMProperty *ins)
+{
+    const Register JSContextReg = ToRegister(ins->getJSContextReg());
+    const Register ObjectReg = ToRegister(ins->getObjectReg());
+    const Register PrivateReg = ToRegister(ins->getPrivReg());
+    const Register ValueReg = ToRegister(ins->getValueReg());
+
+    DebugOnly<uint32_t> initialStack = masm.framePushed();
+
+    masm.checkStackAlignment();
+
+    // Make space for the outparam.  Pre-initialize it to UndefinedValue so we
+    // can trace it at GC time.
+    masm.Push(UndefinedValue());
+    // We pass the pointer to our out param as an instance of
+    // JSJitGetterCallArgs, since on the binary level it's the same thing.
+    JS_STATIC_ASSERT(sizeof(JSJitGetterCallArgs) == sizeof(Value*));
+    masm.movePtr(StackPointer, ValueReg);
+
+    masm.Push(ObjectReg);
+
+    // GetReservedSlot(obj, DOM_OBJECT_SLOT).toPrivate()
+    masm.loadPrivate(Address(ObjectReg, JSObject::getFixedSlotOffset(0)), PrivateReg);
+
+    // Rooting will happen at GC time.
+    masm.movePtr(StackPointer, ObjectReg);
+
+    uint32_t safepointOffset;
+    if (!masm.buildFakeExitFrame(JSContextReg, &safepointOffset))
+        return false;
+    masm.enterFakeExitFrame(ION_FRAME_DOMGETTER);
+
+    if (!markSafepointAt(safepointOffset, ins))
+        return false;
+
+    masm.setupUnalignedABICall(4, JSContextReg);
+
+    masm.loadJSContext(JSContextReg);
+
+    masm.passABIArg(JSContextReg);
+    masm.passABIArg(ObjectReg);
+    masm.passABIArg(PrivateReg);
+    masm.passABIArg(ValueReg);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ins->mir()->fun()));
+
+    if (ins->mir()->isInfallible()) {
+        masm.loadValue(Address(StackPointer, IonDOMExitFrameLayout::offsetOfResult()),
+                       JSReturnOperand);
+    } else {
+        masm.branchIfFalseBool(ReturnReg, masm.exceptionLabel());
+
+        masm.loadValue(Address(StackPointer, IonDOMExitFrameLayout::offsetOfResult()),
+                       JSReturnOperand);
+    }
+    masm.adjustStack(IonDOMExitFrameLayout::Size());
+
+    JS_ASSERT(masm.framePushed() == initialStack);
+    return true;
+}
+
+bool
+CodeGenerator::visitGetDOMMember(LGetDOMMember *ins)
+{
+    // It's simple to duplicate visitLoadFixedSlotV here than it is to try to
+    // use an LLoadFixedSlotV or some subclass of it for this case: that would
+    // require us to have MGetDOMMember inherit from MLoadFixedSlot, and then
+    // we'd have to duplicate a bunch of stuff we now get for free from
+    // MGetDOMProperty.
+    Register object = ToRegister(ins->object());
+    size_t slot = ins->mir()->domMemberSlotIndex();
+    ValueOperand result = GetValueOutput(ins);
+
+    masm.loadValue(Address(object, JSObject::getFixedSlotOffset(slot)), result);
+    return true;
+}
+
+bool
+CodeGenerator::visitSetDOMProperty(LSetDOMProperty *ins)
+{
+    const Register JSContextReg = ToRegister(ins->getJSContextReg());
+    const Register ObjectReg = ToRegister(ins->getObjectReg());
+    const Register PrivateReg = ToRegister(ins->getPrivReg());
+    const Register ValueReg = ToRegister(ins->getValueReg());
+
+    DebugOnly<uint32_t> initialStack = masm.framePushed();
+
+    masm.checkStackAlignment();
+
+    // Push the argument. Rooting will happen at GC time.
+    ValueOperand argVal = ToValue(ins, LSetDOMProperty::Value);
+    masm.Push(argVal);
+    // We pass the pointer to our out param as an instance of
+    // JSJitGetterCallArgs, since on the binary level it's the same thing.
+    JS_STATIC_ASSERT(sizeof(JSJitSetterCallArgs) == sizeof(Value*));
+    masm.movePtr(StackPointer, ValueReg);
+
+    masm.Push(ObjectReg);
+
+    // GetReservedSlot(obj, DOM_OBJECT_SLOT).toPrivate()
+    masm.loadPrivate(Address(ObjectReg, JSObject::getFixedSlotOffset(0)), PrivateReg);
+
+    // Rooting will happen at GC time.
+    masm.movePtr(StackPointer, ObjectReg);
+
+    uint32_t safepointOffset;
+    if (!masm.buildFakeExitFrame(JSContextReg, &safepointOffset))
+        return false;
+    masm.enterFakeExitFrame(ION_FRAME_DOMSETTER);
+
+    if (!markSafepointAt(safepointOffset, ins))
+        return false;
+
+    masm.setupUnalignedABICall(4, JSContextReg);
+
+    masm.loadJSContext(JSContextReg);
+
+    masm.passABIArg(JSContextReg);
+    masm.passABIArg(ObjectReg);
+    masm.passABIArg(PrivateReg);
+    masm.passABIArg(ValueReg);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, ins->mir()->fun()));
+
+    masm.branchIfFalseBool(ReturnReg, masm.exceptionLabel());
+
+    masm.adjustStack(IonDOMExitFrameLayout::Size());
+
+    JS_ASSERT(masm.framePushed() == initialStack);
+    return true;
+}
+
+typedef bool(*SPSFn)(JSContext *, HandleScript);
+static const VMFunction SPSEnterInfo = FunctionInfo<SPSFn>(SPSEnter);
+static const VMFunction SPSExitInfo = FunctionInfo<SPSFn>(SPSExit);
+
+bool
+CodeGenerator::visitProfilerStackOp(LProfilerStackOp *lir)
+{
+    Register temp = ToRegister(lir->temp()->output());
+    bool inlinedFunction = lir->inlineLevel() > 0;
+
+    switch (lir->type()) {
+        case MProfilerStackOp::InlineEnter:
+            // Multiple scripts can be inlined at one depth, but there is only
+            // one InlineExit node to signify this. To deal with this, if we
+            // reach the entry of another inline script on the same level, then
+            // just reset the sps metadata about the frame. We must balance
+            // calls to leave()/reenter(), so perform the balance without
+            // emitting any instrumentation. Technically the previous inline
+            // call at this same depth has reentered, but the instrumentation
+            // will be emitted at the common join point for all inlines at the
+            // same depth.
+            if (sps_.inliningDepth() == lir->inlineLevel()) {
+                sps_.leaveInlineFrame();
+                sps_.skipNextReenter();
+                sps_.reenter(masm, temp);
+            }
+
+            sps_.leave(masm, temp, /* inlinedFunction = */ true);
+            if (!sps_.enterInlineFrame())
+                return false;
+            // fallthrough
+
+        case MProfilerStackOp::Enter:
+            if (gen->options.spsSlowAssertionsEnabled()) {
+                if (!inlinedFunction || js_JitOptions.profileInlineFrames) {
+                    saveLive(lir);
+                    pushArg(ImmGCPtr(lir->script()));
+                    if (!callVM(SPSEnterInfo, lir))
+                        return false;
+                    restoreLive(lir);
+                }
+                sps_.pushManual(lir->script(), masm, temp, /* inlinedFunction = */ inlinedFunction);
+                return true;
+            }
+
+            return sps_.push(lir->script(), masm, temp, /* inlinedFunction = */ inlinedFunction);
+
+        case MProfilerStackOp::InlineExit:
+            // all inline returns were covered with ::Exit, so we just need to
+            // maintain the state of inline frames currently active and then
+            // reenter the caller
+            sps_.leaveInlineFrame();
+            sps_.reenter(masm, temp, /* inlinedFunction = */ true);
+            return true;
+
+        case MProfilerStackOp::Exit:
+            if (gen->options.spsSlowAssertionsEnabled()) {
+                if (!inlinedFunction || js_JitOptions.profileInlineFrames) {
+                    saveLive(lir);
+                    pushArg(ImmGCPtr(lir->script()));
+                    // Once we've exited, then we shouldn't emit instrumentation for
+                    // the corresponding reenter() because we no longer have a
+                    // frame.
+                    sps_.skipNextReenter();
+                    if (!callVM(SPSExitInfo, lir))
+                        return false;
+                    restoreLive(lir);
+                }
+                return true;
+            }
+
+            sps_.pop(masm, temp, /* inlinedFunction = */ inlinedFunction);
+            return true;
+
+        default:
+            MOZ_ASSUME_UNREACHABLE("invalid LProfilerStackOp type");
+    }
+}
+
+bool
+CodeGenerator::visitOutOfLineAbortPar(OutOfLineAbortPar *ool)
+{
+    ParallelBailoutCause cause = ool->cause();
+    jsbytecode *bytecode = ool->bytecode();
+
+    masm.move32(Imm32(cause), CallTempReg0);
+    loadOutermostJSScript(CallTempReg1);
+    loadJSScriptForBlock(ool->basicBlock(), CallTempReg2);
+    masm.movePtr(ImmPtr(bytecode), CallTempReg3);
+
+    masm.setupUnalignedABICall(4, CallTempReg4);
+    masm.passABIArg(CallTempReg0);
+    masm.passABIArg(CallTempReg1);
+    masm.passABIArg(CallTempReg2);
+    masm.passABIArg(CallTempReg3);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, AbortPar));
+
+    masm.moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand);
+    masm.jump(&returnLabel_);
+    return true;
+}
+
+bool
+CodeGenerator::visitIsCallable(LIsCallable *ins)
+{
+    Register object = ToRegister(ins->object());
+    Register output = ToRegister(ins->output());
+
+    masm.loadObjClass(object, output);
+
+    // An object is callable iff (is<JSFunction>() || getClass()->call).
+    Label notFunction, done, notCall;
+    masm.branchPtr(Assembler::NotEqual, output, ImmPtr(&JSFunction::class_), &notFunction);
+    masm.move32(Imm32(1), output);
+    masm.jump(&done);
+
+    masm.bind(&notFunction);
+    masm.cmpPtrSet(Assembler::NonZero, Address(output, offsetof(js::Class, call)), ImmPtr(nullptr), output);
+    masm.bind(&done);
+
+    return true;
+}
+
+void
+CodeGenerator::loadOutermostJSScript(Register reg)
+{
+    // The "outermost" JSScript means the script that we are compiling
+    // basically; this is not always the script associated with the
+    // current basic block, which might be an inlined script.
+
+    MIRGraph &graph = current->mir()->graph();
+    MBasicBlock *entryBlock = graph.entryBlock();
+    masm.movePtr(ImmGCPtr(entryBlock->info().script()), reg);
+}
+
+void
+CodeGenerator::loadJSScriptForBlock(MBasicBlock *block, Register reg)
+{
+    // The current JSScript means the script for the current
+    // basic block. This may be an inlined script.
+
+    JSScript *script = block->info().script();
+    masm.movePtr(ImmGCPtr(script), reg);
+}
+
+bool
+CodeGenerator::visitOutOfLinePropagateAbortPar(OutOfLinePropagateAbortPar *ool)
+{
+    loadOutermostJSScript(CallTempReg0);
+    loadJSScriptForBlock(ool->lir()->mirRaw()->block(), CallTempReg1);
+
+    masm.setupUnalignedABICall(2, CallTempReg2);
+    masm.passABIArg(CallTempReg0);
+    masm.passABIArg(CallTempReg1);
+    masm.callWithABI(JS_FUNC_TO_DATA_PTR(void *, PropagateAbortPar));
+
+    masm.moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand);
+    masm.jump(&returnLabel_);
+    return true;
+}
+
+bool
+CodeGenerator::visitHaveSameClass(LHaveSameClass *ins)
+{
+    Register lhs = ToRegister(ins->lhs());
+    Register rhs = ToRegister(ins->rhs());
+    Register temp = ToRegister(ins->getTemp(0));
+    Register output = ToRegister(ins->output());
+
+    masm.loadObjClass(lhs, temp);
+    masm.loadObjClass(rhs, output);
+    masm.cmpPtrSet(Assembler::Equal, temp, output, output);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitHasClass(LHasClass *ins)
+{
+    Register lhs = ToRegister(ins->lhs());
+    Register output = ToRegister(ins->output());
+
+    masm.loadObjClass(lhs, output);
+    masm.cmpPtrSet(Assembler::Equal, output, ImmPtr(ins->mir()->getClass()), output);
+
+    return true;
+}
+
+bool
+CodeGenerator::visitAsmJSCall(LAsmJSCall *ins)
+{
+    MAsmJSCall *mir = ins->mir();
+
+#if defined(JS_CODEGEN_ARM)
+    if (!useHardFpABI() && mir->callee().which() == MAsmJSCall::Callee::Builtin) {
+        for (unsigned i = 0, e = ins->numOperands(); i < e; i++) {
+            LAllocation *a = ins->getOperand(i);
+            if (a->isFloatReg()) {
+                FloatRegister fr = ToFloatRegister(a);
+                int srcId = fr.code() * 2;
+                masm.ma_vxfer(fr, Register::FromCode(srcId), Register::FromCode(srcId+1));
+            }
+        }
+    }
+#endif
+
+   if (mir->spIncrement())
+        masm.freeStack(mir->spIncrement());
+
+   JS_ASSERT((AlignmentAtPrologue +  masm.framePushed()) % StackAlignment == 0);
+
+#ifdef DEBUG
+    Label ok;
+    JS_ASSERT(IsPowerOfTwo(StackAlignment));
+    masm.branchTestPtr(Assembler::Zero, StackPointer, Imm32(StackAlignment - 1), &ok);
+    masm.assumeUnreachable("Stack should be aligned.");
+    masm.bind(&ok);
+#endif
+
+    MAsmJSCall::Callee callee = mir->callee();
+    switch (callee.which()) {
+      case MAsmJSCall::Callee::Internal:
+        masm.call(mir->desc(), callee.internal());
+        break;
+      case MAsmJSCall::Callee::Dynamic:
+        masm.call(mir->desc(), ToRegister(ins->getOperand(mir->dynamicCalleeOperandIndex())));
+        break;
+      case MAsmJSCall::Callee::Builtin:
+        masm.call(mir->desc(), callee.builtin());
+        break;
+    }
+
+    if (mir->spIncrement())
+        masm.reserveStack(mir->spIncrement());
+
+    postAsmJSCall(ins);
+    return true;
+}
+
+bool
+CodeGenerator::visitAsmJSParameter(LAsmJSParameter *lir)
+{
+    return true;
+}
+
+bool
+CodeGenerator::visitAsmJSReturn(LAsmJSReturn *lir)
+{
+    // Don't emit a jump to the return label if this is the last block.
+    if (current->mir() != *gen->graph().poBegin())
+        masm.jump(&returnLabel_);
+    return true;
+}
+
+bool
+CodeGenerator::visitAsmJSVoidReturn(LAsmJSVoidReturn *lir)
+{
+    // Don't emit a jump to the return label if this is the last block.
+    if (current->mir() != *gen->graph().poBegin())
+        masm.jump(&returnLabel_);
+    return true;
+}
+
+bool
+CodeGenerator::emitAssertRangeI(const Range *r, Register input)
+{
+    // Check the lower bound.
+    if (r->hasInt32LowerBound() && r->lower() > INT32_MIN) {
+        Label success;
+        masm.branch32(Assembler::GreaterThanOrEqual, input, Imm32(r->lower()), &success);
+        masm.assumeUnreachable("Integer input should be equal or higher than Lowerbound.");
+        masm.bind(&success);
+    }
+
+    // Check the upper bound.
+    if (r->hasInt32UpperBound() && r->upper() < INT32_MAX) {
+        Label success;
+        masm.branch32(Assembler::LessThanOrEqual, input, Imm32(r->upper()), &success);
+        masm.assumeUnreachable("Integer input should be lower or equal than Upperbound.");
+        masm.bind(&success);
+    }
+
+    // For r->canHaveFractionalPart() and r->exponent(), there's nothing to check, because
+    // if we ended up in the integer range checking code, the value is already
+    // in an integer register in the integer range.
+
+    return true;
+}
+
+bool
+CodeGenerator::emitAssertRangeD(const Range *r, FloatRegister input, FloatRegister temp)
+{
+    // Check the lower bound.
+    if (r->hasInt32LowerBound()) {
+        Label success;
+        masm.loadConstantDouble(r->lower(), temp);
+        if (r->canBeNaN())
+            masm.branchDouble(Assembler::DoubleUnordered, input, input, &success);
+        masm.branchDouble(Assembler::DoubleGreaterThanOrEqual, input, temp, &success);
+        masm.assumeUnreachable("Double input should be equal or higher than Lowerbound.");
+        masm.bind(&success);
+    }
+    // Check the upper bound.
+    if (r->hasInt32UpperBound()) {
+        Label success;
+        masm.loadConstantDouble(r->upper(), temp);
+        if (r->canBeNaN())
+            masm.branchDouble(Assembler::DoubleUnordered, input, input, &success);
+        masm.branchDouble(Assembler::DoubleLessThanOrEqual, input, temp, &success);
+        masm.assumeUnreachable("Double input should be lower or equal than Upperbound.");
+        masm.bind(&success);
+    }
+
+    // This code does not yet check r->canHaveFractionalPart(). This would require new
+    // assembler interfaces to make rounding instructions available.
+
+    if (!r->hasInt32Bounds() && !r->canBeInfiniteOrNaN() &&
+        r->exponent() < FloatingPoint<double>::ExponentBias)
+    {
+        // Check the bounds implied by the maximum exponent.
+        Label exponentLoOk;
+        masm.loadConstantDouble(pow(2.0, r->exponent() + 1), temp);
+        masm.branchDouble(Assembler::DoubleUnordered, input, input, &exponentLoOk);
+        masm.branchDouble(Assembler::DoubleLessThanOrEqual, input, temp, &exponentLoOk);
+        masm.assumeUnreachable("Check for exponent failed.");
+        masm.bind(&exponentLoOk);
+
+        Label exponentHiOk;
+        masm.loadConstantDouble(-pow(2.0, r->exponent() + 1), temp);
+        masm.branchDouble(Assembler::DoubleUnordered, input, input, &exponentHiOk);
+        masm.branchDouble(Assembler::DoubleGreaterThanOrEqual, input, temp, &exponentHiOk);
+        masm.assumeUnreachable("Check for exponent failed.");
+        masm.bind(&exponentHiOk);
+    } else if (!r->hasInt32Bounds() && !r->canBeNaN()) {
+        // If we think the value can't be NaN, check that it isn't.
+        Label notnan;
+        masm.branchDouble(Assembler::DoubleOrdered, input, input, &notnan);
+        masm.assumeUnreachable("Input shouldn't be NaN.");
+        masm.bind(&notnan);
+
+        // If we think the value also can't be an infinity, check that it isn't.
+        if (!r->canBeInfiniteOrNaN()) {
+            Label notposinf;
+            masm.loadConstantDouble(PositiveInfinity<double>(), temp);
+            masm.branchDouble(Assembler::DoubleLessThan, input, temp, &notposinf);
+            masm.assumeUnreachable("Input shouldn't be +Inf.");
+            masm.bind(&notposinf);
+
+            Label notneginf;
+            masm.loadConstantDouble(NegativeInfinity<double>(), temp);
+            masm.branchDouble(Assembler::DoubleGreaterThan, input, temp, &notneginf);
+            masm.assumeUnreachable("Input shouldn't be -Inf.");
+            masm.bind(&notneginf);
+        }
+    }
+
+    return true;
+}
+
+bool
+CodeGenerator::visitAssertRangeI(LAssertRangeI *ins)
+{
+    Register input = ToRegister(ins->input());
+    const Range *r = ins->range();
+
+    return emitAssertRangeI(r, input);
+}
+
+bool
+CodeGenerator::visitAssertRangeD(LAssertRangeD *ins)
+{
+    FloatRegister input = ToFloatRegister(ins->input());
+    FloatRegister temp = ToFloatRegister(ins->temp());
+    const Range *r = ins->range();
+
+    return emitAssertRangeD(r, input, temp);
+}
+
+bool
+CodeGenerator::visitAssertRangeF(LAssertRangeF *ins)
+{
+    FloatRegister input = ToFloatRegister(ins->input());
+    FloatRegister temp = ToFloatRegister(ins->temp());
+    const Range *r = ins->range();
+
+    masm.convertFloat32ToDouble(input, input);
+    bool success = emitAssertRangeD(r, input, temp);
+    masm.convertDoubleToFloat32(input, input);
+    return success;
+}
+
+bool
+CodeGenerator::visitAssertRangeV(LAssertRangeV *ins)
+{
+    const Range *r = ins->range();
+    const ValueOperand value = ToValue(ins, LAssertRangeV::Input);
+    Register tag = masm.splitTagForTest(value);
+    Label done;
+
+    {
+        Label isNotInt32;
+        masm.branchTestInt32(Assembler::NotEqual, tag, &isNotInt32);
+        Register unboxInt32 = ToTempUnboxRegister(ins->temp());
+        Register input = masm.extractInt32(value, unboxInt32);
+        emitAssertRangeI(r, input);
+        masm.jump(&done);
+        masm.bind(&isNotInt32);
+    }
+
+    {
+        Label isNotDouble;
+        masm.branchTestDouble(Assembler::NotEqual, tag, &isNotDouble);
+        FloatRegister input = ToFloatRegister(ins->floatTemp1());
+        FloatRegister temp = ToFloatRegister(ins->floatTemp2());
+        masm.unboxDouble(value, input);
+        emitAssertRangeD(r, input, temp);
+        masm.jump(&done);
+        masm.bind(&isNotDouble);
+    }
+
+    masm.assumeUnreachable("Incorrect range for Value.");
+    masm.bind(&done);
+    return true;
+}
+
+typedef bool (*RecompileFn)(JSContext *);
+static const VMFunction RecompileFnInfo = FunctionInfo<RecompileFn>(Recompile);
+
+bool
+CodeGenerator::visitRecompileCheck(LRecompileCheck *ins)
+{
+    Label done;
+    Register tmp = ToRegister(ins->scratch());
+    OutOfLineCode *ool = oolCallVM(RecompileFnInfo, ins, (ArgList()), StoreRegisterTo(tmp));
+
+    // Check if usecount is high enough.
+    masm.movePtr(ImmPtr(ins->mir()->script()->addressOfUseCount()), tmp);
+    Address ptr(tmp, 0);
+    masm.add32(Imm32(1), tmp);
+    masm.branch32(Assembler::BelowOrEqual, ptr, Imm32(ins->mir()->useCount()), &done);
+
+    // Check if not yet recompiling.
+    CodeOffsetLabel label = masm.movWithPatch(ImmWord(uintptr_t(-1)), tmp);
+    if (!ionScriptLabels_.append(label))
+        return false;
+    masm.branch32(Assembler::Equal,
+                  Address(tmp, IonScript::offsetOfRecompiling()),
+                  Imm32(0),
+                  ool->entry());
+    masm.bind(ool->rejoin());
+    masm.bind(&done);
+
+    return true;
+}
+
+} // namespace jit
+} // namespace js