The Tor Browser: js/src/jit/x64/MacroAssembler-x64.h@6474c204b198 (annotated)

js/src/jit/x64/MacroAssembler-x64.h@6474c204b198 (annotated)

js/src/jit/x64/MacroAssembler-x64.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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/. */
 #ifndef jit_x64_MacroAssembler_x64_h
 #define jit_x64_MacroAssembler_x64_h
 #include "jit/IonFrames.h"
 #include "jit/MoveResolver.h"
 #include "jit/shared/MacroAssembler-x86-shared.h"
 namespace js {
 namespace jit {
 struct ImmShiftedTag : public ImmWord
 {
     ImmShiftedTag(JSValueShiftedTag shtag)
       : ImmWord((uintptr_t)shtag)
     { }
     ImmShiftedTag(JSValueType type)
       : ImmWord(uintptr_t(JSValueShiftedTag(JSVAL_TYPE_TO_SHIFTED_TAG(type))))
     { }
 };
 struct ImmTag : public Imm32
 {
     ImmTag(JSValueTag tag)
       : Imm32(tag)
     { }
 };
 class MacroAssemblerX64 : public MacroAssemblerX86Shared
 {
     // Number of bytes the stack is adjusted inside a call to C. Calls to C may
     // not be nested.
     bool inCall_;
     uint32_t args_;
     uint32_t passedIntArgs_;
     uint32_t passedFloatArgs_;
     uint32_t stackForCall_;
     bool dynamicAlignment_;
     bool enoughMemory_;
     // These use SystemAllocPolicy since asm.js releases memory after each
     // function is compiled, and these need to live until after all functions
     // are compiled.
     struct Double {
         double value;
         NonAssertingLabel uses;
         Double(double value) : value(value) {}
     };
     Vector<Double, 0, SystemAllocPolicy> doubles_;
     typedef HashMap<double, size_t, DefaultHasher<double>, SystemAllocPolicy> DoubleMap;
     DoubleMap doubleMap_;
     struct Float {
         float value;
         NonAssertingLabel uses;
         Float(float value) : value(value) {}
     };
     Vector<Float, 0, SystemAllocPolicy> floats_;
     typedef HashMap<float, size_t, DefaultHasher<float>, SystemAllocPolicy> FloatMap;
     FloatMap floatMap_;
     void setupABICall(uint32_t arg);
   protected:
     MoveResolver moveResolver_;
   public:
     using MacroAssemblerX86Shared::call;
     using MacroAssemblerX86Shared::Push;
     using MacroAssemblerX86Shared::Pop;
     using MacroAssemblerX86Shared::callWithExitFrame;
     using MacroAssemblerX86Shared::branch32;
     using MacroAssemblerX86Shared::load32;
     using MacroAssemblerX86Shared::store32;
     MacroAssemblerX64()
       : inCall_(false),
         enoughMemory_(true)
     {
     }
     // The buffer is about to be linked, make sure any constant pools or excess
     // bookkeeping has been flushed to the instruction stream.
     void finish();
     bool oom() const {
         return MacroAssemblerX86Shared::oom() || !enoughMemory_;
     }
     /////////////////////////////////////////////////////////////////
     // X64 helpers.
     /////////////////////////////////////////////////////////////////
     void call(ImmWord target) {
         mov(target, rax);
         call(rax);
     }
     void call(ImmPtr target) {
         call(ImmWord(uintptr_t(target.value)));
     }
     void call(AsmJSImmPtr target) {
         mov(target, rax);
         call(rax);
     }
     void call(const CallSiteDesc &desc, AsmJSImmPtr target) {
         call(target);
         appendCallSite(desc);
     }
     void callExit(AsmJSImmPtr target, uint32_t stackArgBytes) {
         call(CallSiteDesc::Exit(), target);
     }
     // Refers to the upper 32 bits of a 64-bit Value operand.
     // On x86_64, the upper 32 bits do not necessarily only contain the type.
     Operand ToUpper32(Operand base) {
         switch (base.kind()) {
           case Operand::MEM_REG_DISP:
             return Operand(Register::FromCode(base.base()), base.disp() + 4);
           case Operand::MEM_SCALE:
             return Operand(Register::FromCode(base.base()), Register::FromCode(base.index()),
                            base.scale(), base.disp() + 4);
           default:
             MOZ_ASSUME_UNREACHABLE("unexpected operand kind");
         }
     }
     static inline Operand ToUpper32(const Address &address) {
         return Operand(address.base, address.offset + 4);
     }
     static inline Operand ToUpper32(const BaseIndex &address) {
         return Operand(address.base, address.index, address.scale, address.offset + 4);
     }
     uint32_t Upper32Of(JSValueShiftedTag tag) {
         union { // Implemented in this way to appease MSVC++.
             uint64_t tag;
             struct {
                 uint32_t lo32;
                 uint32_t hi32;
             } s;
         } e;
         e.tag = tag;
         return e.s.hi32;
     }
     JSValueShiftedTag GetShiftedTag(JSValueType type) {
         return (JSValueShiftedTag)JSVAL_TYPE_TO_SHIFTED_TAG(type);
     }
     /////////////////////////////////////////////////////////////////
     // X86/X64-common interface.
     /////////////////////////////////////////////////////////////////
     void storeValue(ValueOperand val, Operand dest) {
         movq(val.valueReg(), dest);
     }
     void storeValue(ValueOperand val, const Address &dest) {
         storeValue(val, Operand(dest));
     }
     template <typename T>
     void storeValue(JSValueType type, Register reg, const T &dest) {
         // Value types with 32-bit payloads can be emitted as two 32-bit moves.
         if (type == JSVAL_TYPE_INT32 || type == JSVAL_TYPE_BOOLEAN) {
             movl(reg, Operand(dest));
             movl(Imm32(Upper32Of(GetShiftedTag(type))), ToUpper32(Operand(dest)));
         } else {
             boxValue(type, reg, ScratchReg);
             movq(ScratchReg, Operand(dest));
         }
     }
     template <typename T>
     void storeValue(const Value &val, const T &dest) {
         jsval_layout jv = JSVAL_TO_IMPL(val);
         if (val.isMarkable()) {
             movWithPatch(ImmWord(jv.asBits), ScratchReg);
             writeDataRelocation(val);
         } else {
             mov(ImmWord(jv.asBits), ScratchReg);
         }
         movq(ScratchReg, Operand(dest));
     }
     void storeValue(ValueOperand val, BaseIndex dest) {
         storeValue(val, Operand(dest));
     }
     void loadValue(Operand src, ValueOperand val) {
         movq(src, val.valueReg());
     }
     void loadValue(Address src, ValueOperand val) {
         loadValue(Operand(src), val);
     }
     void loadValue(const BaseIndex &src, ValueOperand val) {
         loadValue(Operand(src), val);
     }
     void tagValue(JSValueType type, Register payload, ValueOperand dest) {
         JS_ASSERT(dest.valueReg() != ScratchReg);
         if (payload != dest.valueReg())
             movq(payload, dest.valueReg());
         mov(ImmShiftedTag(type), ScratchReg);
         orq(ScratchReg, dest.valueReg());
     }
     void pushValue(ValueOperand val) {
         push(val.valueReg());
     }
     void Push(const ValueOperand &val) {
         pushValue(val);
         framePushed_ += sizeof(Value);
     }
     void popValue(ValueOperand val) {
         pop(val.valueReg());
     }
     void pushValue(const Value &val) {
         jsval_layout jv = JSVAL_TO_IMPL(val);
         push(ImmWord(jv.asBits));
     }
     void pushValue(JSValueType type, Register reg) {
         boxValue(type, reg, ScratchReg);
         push(ScratchReg);
     }
     void pushValue(const Address &addr) {
         push(Operand(addr));
     }
     void Pop(const ValueOperand &val) {
         popValue(val);
         framePushed_ -= sizeof(Value);
     }
     void moveValue(const Value &val, const Register &dest) {
         jsval_layout jv = JSVAL_TO_IMPL(val);
         movWithPatch(ImmWord(jv.asBits), dest);
         writeDataRelocation(val);
     }
     void moveValue(const Value &src, const ValueOperand &dest) {
         moveValue(src, dest.valueReg());
     }
     void moveValue(const ValueOperand &src, const ValueOperand &dest) {
         if (src.valueReg() != dest.valueReg())
             movq(src.valueReg(), dest.valueReg());
     }
     void boxValue(JSValueType type, Register src, Register dest) {
         JS_ASSERT(src != dest);
         JSValueShiftedTag tag = (JSValueShiftedTag)JSVAL_TYPE_TO_SHIFTED_TAG(type);
 #ifdef DEBUG
         if (type == JSVAL_TYPE_INT32 || type == JSVAL_TYPE_BOOLEAN) {
             Label upper32BitsZeroed;
             movePtr(ImmWord(UINT32_MAX), dest);
             branchPtr(Assembler::BelowOrEqual, src, dest, &upper32BitsZeroed);
             breakpoint();
             bind(&upper32BitsZeroed);
         }
 #endif
         mov(ImmShiftedTag(tag), dest);
         orq(src, dest);
     }
     Condition testUndefined(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_TAG_UNDEFINED));
         return cond;
     }
     Condition testInt32(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_TAG_INT32));
         return cond;
     }
     Condition testBoolean(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_TAG_BOOLEAN));
         return cond;
     }
     Condition testNull(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_TAG_NULL));
         return cond;
     }
     Condition testString(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_TAG_STRING));
         return cond;
     }
     Condition testObject(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_TAG_OBJECT));
         return cond;
     }
     Condition testDouble(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, Imm32(JSVAL_TAG_MAX_DOUBLE));
         return cond == Equal ? BelowOrEqual : Above;
     }
     Condition testNumber(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, Imm32(JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET));
         return cond == Equal ? BelowOrEqual : Above;
     }
     Condition testGCThing(Condition cond, Register tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, Imm32(JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET));
         return cond == Equal ? AboveOrEqual : Below;
     }
     Condition testMagic(Condition cond, const Register &tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_TAG_MAGIC));
         return cond;
     }
     Condition testError(Condition cond, const Register &tag) {
         return testMagic(cond, tag);
     }
     Condition testPrimitive(Condition cond, const Register &tag) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(tag, ImmTag(JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET));
         return cond == Equal ? Below : AboveOrEqual;
     }
     Condition testUndefined(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testUndefined(cond, ScratchReg);
     }
     Condition testInt32(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testInt32(cond, ScratchReg);
     }
     Condition testBoolean(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testBoolean(cond, ScratchReg);
     }
     Condition testDouble(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testDouble(cond, ScratchReg);
     }
     Condition testNumber(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testNumber(cond, ScratchReg);
     }
     Condition testNull(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testNull(cond, ScratchReg);
     }
     Condition testString(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testString(cond, ScratchReg);
     }
     Condition testObject(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testObject(cond, ScratchReg);
     }
     Condition testGCThing(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testGCThing(cond, ScratchReg);
     }
     Condition testPrimitive(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testPrimitive(cond, ScratchReg);
     }
     Condition testUndefined(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testUndefined(cond, ScratchReg);
     }
     Condition testInt32(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testInt32(cond, ScratchReg);
     }
     Condition testBoolean(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testBoolean(cond, ScratchReg);
     }
     Condition testDouble(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testDouble(cond, ScratchReg);
     }
     Condition testNumber(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testNumber(cond, ScratchReg);
     }
     Condition testNull(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testNull(cond, ScratchReg);
     }
     Condition testString(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testString(cond, ScratchReg);
     }
     Condition testObject(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testObject(cond, ScratchReg);
     }
     Condition testPrimitive(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testPrimitive(cond, ScratchReg);
     }
     Condition testGCThing(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testGCThing(cond, ScratchReg);
     }
     Condition testMagic(Condition cond, const Address &src) {
         splitTag(src, ScratchReg);
         return testMagic(cond, ScratchReg);
     }
     Condition testUndefined(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testUndefined(cond, ScratchReg);
     }
     Condition testNull(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testNull(cond, ScratchReg);
     }
     Condition testBoolean(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testBoolean(cond, ScratchReg);
     }
     Condition testString(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testString(cond, ScratchReg);
     }
     Condition testInt32(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testInt32(cond, ScratchReg);
     }
     Condition testObject(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testObject(cond, ScratchReg);
     }
     Condition testDouble(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testDouble(cond, ScratchReg);
     }
     Condition testMagic(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testMagic(cond, ScratchReg);
     }
     Condition testGCThing(Condition cond, const BaseIndex &src) {
         splitTag(src, ScratchReg);
         return testGCThing(cond, ScratchReg);
     }
     Condition isMagic(Condition cond, const ValueOperand &src, JSWhyMagic why) {
         uint64_t magic = MagicValue(why).asRawBits();
         cmpPtr(src.valueReg(), ImmWord(magic));
         return cond;
     }
     void cmpPtr(const Register &lhs, const ImmWord rhs) {
         JS_ASSERT(lhs != ScratchReg);
         mov(rhs, ScratchReg);
         cmpq(lhs, ScratchReg);
     }
     void cmpPtr(const Register &lhs, const ImmPtr rhs) {
         cmpPtr(lhs, ImmWord(uintptr_t(rhs.value)));
     }
     void cmpPtr(const Register &lhs, const ImmGCPtr rhs) {
         JS_ASSERT(lhs != ScratchReg);
         movq(rhs, ScratchReg);
         cmpq(lhs, ScratchReg);
     }
     void cmpPtr(const Register &lhs, const Imm32 rhs) {
         cmpq(lhs, rhs);
     }
     void cmpPtr(const Operand &lhs, const ImmGCPtr rhs) {
         movq(rhs, ScratchReg);
         cmpq(lhs, ScratchReg);
     }
     void cmpPtr(const Operand &lhs, const ImmWord rhs) {
         if ((intptr_t)rhs.value <= INT32_MAX && (intptr_t)rhs.value >= INT32_MIN) {
             cmpq(lhs, Imm32((int32_t)rhs.value));
         } else {
             mov(rhs, ScratchReg);
             cmpq(lhs, ScratchReg);
         }
     }
     void cmpPtr(const Operand &lhs, const ImmPtr rhs) {
         cmpPtr(lhs, ImmWord(uintptr_t(rhs.value)));
     }
     void cmpPtr(const Address &lhs, const ImmGCPtr rhs) {
         cmpPtr(Operand(lhs), rhs);
     }
     void cmpPtr(const Address &lhs, const ImmWord rhs) {
         cmpPtr(Operand(lhs), rhs);
     }
     void cmpPtr(const Address &lhs, const ImmPtr rhs) {
         cmpPtr(lhs, ImmWord(uintptr_t(rhs.value)));
     }
     void cmpPtr(const Operand &lhs, const Register &rhs) {
         cmpq(lhs, rhs);
     }
     void cmpPtr(const Operand &lhs, const Imm32 rhs) {
         cmpq(lhs, rhs);
     }
     void cmpPtr(const Address &lhs, const Register &rhs) {
         cmpPtr(Operand(lhs), rhs);
     }
     void cmpPtr(const Register &lhs, const Register &rhs) {
         return cmpq(lhs, rhs);
     }
     void testPtr(const Register &lhs, const Register &rhs) {
         testq(lhs, rhs);
     }
     template <typename T1, typename T2>
     void cmpPtrSet(Assembler::Condition cond, T1 lhs, T2 rhs, const Register &dest)
     {
         cmpPtr(lhs, rhs);
         emitSet(cond, dest);
     }
     /////////////////////////////////////////////////////////////////
     // Common interface.
     /////////////////////////////////////////////////////////////////
     void reserveStack(uint32_t amount) {
         if (amount)
             subq(Imm32(amount), StackPointer);
         framePushed_ += amount;
     }
     void freeStack(uint32_t amount) {
         JS_ASSERT(amount <= framePushed_);
         if (amount)
             addq(Imm32(amount), StackPointer);
         framePushed_ -= amount;
     }
     void freeStack(Register amount) {
         addq(amount, StackPointer);
     }
     void addPtr(const Register &src, const Register &dest) {
         addq(src, dest);
     }
     void addPtr(Imm32 imm, const Register &dest) {
         addq(imm, dest);
     }
     void addPtr(Imm32 imm, const Address &dest) {
         addq(imm, Operand(dest));
     }
     void addPtr(Imm32 imm, const Operand &dest) {
         addq(imm, dest);
     }
     void addPtr(ImmWord imm, const Register &dest) {
         JS_ASSERT(dest != ScratchReg);
         if ((intptr_t)imm.value <= INT32_MAX && (intptr_t)imm.value >= INT32_MIN) {
             addq(Imm32((int32_t)imm.value), dest);
         } else {
             mov(imm, ScratchReg);
             addq(ScratchReg, dest);
         }
     }
     void addPtr(ImmPtr imm, const Register &dest) {
         addPtr(ImmWord(uintptr_t(imm.value)), dest);
     }
     void addPtr(const Address &src, const Register &dest) {
         addq(Operand(src), dest);
     }
     void subPtr(Imm32 imm, const Register &dest) {
         subq(imm, dest);
     }
     void subPtr(const Register &src, const Register &dest) {
         subq(src, dest);
     }
     void subPtr(const Address &addr, const Register &dest) {
         subq(Operand(addr), dest);
     }
     void subPtr(const Register &src, const Address &dest) {
         subq(src, Operand(dest));
     }
     void branch32(Condition cond, const AbsoluteAddress &lhs, Imm32 rhs, Label *label) {
         if (JSC::X86Assembler::isAddressImmediate(lhs.addr)) {
             branch32(cond, Operand(lhs), rhs, label);
         } else {
             mov(ImmPtr(lhs.addr), ScratchReg);
             branch32(cond, Address(ScratchReg, 0), rhs, label);
         }
     }
     void branch32(Condition cond, const AbsoluteAddress &lhs, Register rhs, Label *label) {
         if (JSC::X86Assembler::isAddressImmediate(lhs.addr)) {
             branch32(cond, Operand(lhs), rhs, label);
         } else {
             mov(ImmPtr(lhs.addr), ScratchReg);
             branch32(cond, Address(ScratchReg, 0), rhs, label);
         }
     }
     // Specialization for AbsoluteAddress.
     void branchPtr(Condition cond, const AbsoluteAddress &addr, const Register &ptr, Label *label) {
         JS_ASSERT(ptr != ScratchReg);
         if (JSC::X86Assembler::isAddressImmediate(addr.addr)) {
             branchPtr(cond, Operand(addr), ptr, label);
         } else {
             mov(ImmPtr(addr.addr), ScratchReg);
             branchPtr(cond, Operand(ScratchReg, 0x0), ptr, label);
         }
     }
     void branchPtr(Condition cond, const AsmJSAbsoluteAddress &addr, const Register &ptr, Label *label) {
         JS_ASSERT(ptr != ScratchReg);
         mov(AsmJSImmPtr(addr.kind()), ScratchReg);
         branchPtr(cond, Operand(ScratchReg, 0x0), ptr, label);
     }
     void branchPrivatePtr(Condition cond, Address lhs, ImmPtr ptr, Label *label) {
         branchPtr(cond, lhs, ImmWord(uintptr_t(ptr.value) >> 1), label);
     }
     void branchPrivatePtr(Condition cond, Address lhs, Register ptr, Label *label) {
         if (ptr != ScratchReg)
             movePtr(ptr, ScratchReg);
         rshiftPtr(Imm32(1), ScratchReg);
         branchPtr(cond, lhs, ScratchReg, label);
     }
     template <typename T, typename S>
     void branchPtr(Condition cond, T lhs, S ptr, Label *label) {
         cmpPtr(Operand(lhs), ptr);
         j(cond, label);
     }
     CodeOffsetJump jumpWithPatch(RepatchLabel *label) {
         JmpSrc src = jmpSrc(label);
         return CodeOffsetJump(size(), addPatchableJump(src, Relocation::HARDCODED));
     }
     CodeOffsetJump jumpWithPatch(RepatchLabel *label, Condition cond) {
         JmpSrc src = jSrc(cond, label);
         return CodeOffsetJump(size(), addPatchableJump(src, Relocation::HARDCODED));
     }
     template <typename S, typename T>
     CodeOffsetJump branchPtrWithPatch(Condition cond, S lhs, T ptr, RepatchLabel *label) {
         cmpPtr(lhs, ptr);
         return jumpWithPatch(label, cond);
     }
     void branchPtr(Condition cond, Register lhs, Register rhs, Label *label) {
         cmpPtr(lhs, rhs);
         j(cond, label);
     }
     void branchTestPtr(Condition cond, Register lhs, Register rhs, Label *label) {
         testq(lhs, rhs);
         j(cond, label);
     }
     void branchTestPtr(Condition cond, Register lhs, Imm32 imm, Label *label) {
         testq(lhs, imm);
         j(cond, label);
     }
     void branchTestPtr(Condition cond, const Address &lhs, Imm32 imm, Label *label) {
         testq(Operand(lhs), imm);
         j(cond, label);
     }
     void decBranchPtr(Condition cond, const Register &lhs, Imm32 imm, Label *label) {
         subPtr(imm, lhs);
         j(cond, label);
     }
     void movePtr(const Register &src, const Register &dest) {
         movq(src, dest);
     }
     void movePtr(const Register &src, const Operand &dest) {
         movq(src, dest);
     }
     void movePtr(ImmWord imm, Register dest) {
         mov(imm, dest);
     }
     void movePtr(ImmPtr imm, Register dest) {
         mov(imm, dest);
     }
     void movePtr(AsmJSImmPtr imm, const Register &dest) {
         mov(imm, dest);
     }
     void movePtr(ImmGCPtr imm, Register dest) {
         movq(imm, dest);
     }
     void loadPtr(const AbsoluteAddress &address, Register dest) {
         if (JSC::X86Assembler::isAddressImmediate(address.addr)) {
             movq(Operand(address), dest);
         } else {
             mov(ImmPtr(address.addr), ScratchReg);
             loadPtr(Address(ScratchReg, 0x0), dest);
         }
     }
     void loadPtr(const Address &address, Register dest) {
         movq(Operand(address), dest);
     }
     void loadPtr(const Operand &src, Register dest) {
         movq(src, dest);
     }
     void loadPtr(const BaseIndex &src, Register dest) {
         movq(Operand(src), dest);
     }
     void loadPrivate(const Address &src, Register dest) {
         loadPtr(src, dest);
         shlq(Imm32(1), dest);
     }
     void load32(const AbsoluteAddress &address, Register dest) {
         if (JSC::X86Assembler::isAddressImmediate(address.addr)) {
             movl(Operand(address), dest);
         } else {
             mov(ImmPtr(address.addr), ScratchReg);
             load32(Address(ScratchReg, 0x0), dest);
         }
     }
     void storePtr(ImmWord imm, const Address &address) {
         if ((intptr_t)imm.value <= INT32_MAX && (intptr_t)imm.value >= INT32_MIN) {
             movq(Imm32((int32_t)imm.value), Operand(address));
         } else {
             mov(imm, ScratchReg);
             movq(ScratchReg, Operand(address));
         }
     }
     void storePtr(ImmPtr imm, const Address &address) {
         storePtr(ImmWord(uintptr_t(imm.value)), address);
     }
     void storePtr(ImmGCPtr imm, const Address &address) {
         movq(imm, ScratchReg);
         movq(ScratchReg, Operand(address));
     }
     void storePtr(Register src, const Address &address) {
         movq(src, Operand(address));
     }
     void storePtr(Register src, const Operand &dest) {
         movq(src, dest);
     }
     void storePtr(const Register &src, const AbsoluteAddress &address) {
         if (JSC::X86Assembler::isAddressImmediate(address.addr)) {
             movq(src, Operand(address));
         } else {
             mov(ImmPtr(address.addr), ScratchReg);
             storePtr(src, Address(ScratchReg, 0x0));
         }
     }
     void store32(const Register &src, const AbsoluteAddress &address) {
         if (JSC::X86Assembler::isAddressImmediate(address.addr)) {
             movl(src, Operand(address));
         } else {
             mov(ImmPtr(address.addr), ScratchReg);
             store32(src, Address(ScratchReg, 0x0));
         }
     }
     void rshiftPtr(Imm32 imm, Register dest) {
         shrq(imm, dest);
     }
     void lshiftPtr(Imm32 imm, Register dest) {
         shlq(imm, dest);
     }
     void xorPtr(Imm32 imm, Register dest) {
         xorq(imm, dest);
     }
     void xorPtr(Register src, Register dest) {
         xorq(src, dest);
     }
     void orPtr(Imm32 imm, Register dest) {
         orq(imm, dest);
     }
     void orPtr(Register src, Register dest) {
         orq(src, dest);
     }
     void andPtr(Imm32 imm, Register dest) {
         andq(imm, dest);
     }
     void andPtr(Register src, Register dest) {
         andq(src, dest);
     }
     void splitTag(Register src, Register dest) {
         if (src != dest)
             movq(src, dest);
         shrq(Imm32(JSVAL_TAG_SHIFT), dest);
     }
     void splitTag(const ValueOperand &operand, const Register &dest) {
         splitTag(operand.valueReg(), dest);
     }
     void splitTag(const Operand &operand, const Register &dest) {
         movq(operand, dest);
         shrq(Imm32(JSVAL_TAG_SHIFT), dest);
     }
     void splitTag(const Address &operand, const Register &dest) {
         splitTag(Operand(operand), dest);
     }
     void splitTag(const BaseIndex &operand, const Register &dest) {
         splitTag(Operand(operand), dest);
     }
     // Extracts the tag of a value and places it in ScratchReg.
     Register splitTagForTest(const ValueOperand &value) {
         splitTag(value, ScratchReg);
         return ScratchReg;
     }
     void cmpTag(const ValueOperand &operand, ImmTag tag) {
         Register reg = splitTagForTest(operand);
         cmpl(reg, tag);
     }
     void branchTestUndefined(Condition cond, Register tag, Label *label) {
         cond = testUndefined(cond, tag);
         j(cond, label);
     }
     void branchTestInt32(Condition cond, Register tag, Label *label) {
         cond = testInt32(cond, tag);
         j(cond, label);
     }
     void branchTestDouble(Condition cond, Register tag, Label *label) {
         cond = testDouble(cond, tag);
         j(cond, label);
     }
     void branchTestBoolean(Condition cond, Register tag, Label *label) {
         cond = testBoolean(cond, tag);
         j(cond, label);
     }
     void branchTestNull(Condition cond, Register tag, Label *label) {
         cond = testNull(cond, tag);
         j(cond, label);
     }
     void branchTestString(Condition cond, Register tag, Label *label) {
         cond = testString(cond, tag);
         j(cond, label);
     }
     void branchTestObject(Condition cond, Register tag, Label *label) {
         cond = testObject(cond, tag);
         j(cond, label);
     }
     void branchTestNumber(Condition cond, Register tag, Label *label) {
         cond = testNumber(cond, tag);
         j(cond, label);
     }
     // x64 can test for certain types directly from memory when the payload
     // of the type is limited to 32 bits. This avoids loading into a register,
     // accesses half as much memory, and removes a right-shift.
     void branchTestUndefined(Condition cond, const Operand &operand, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(ToUpper32(operand), Imm32(Upper32Of(GetShiftedTag(JSVAL_TYPE_UNDEFINED))));
         j(cond, label);
     }
     void branchTestUndefined(Condition cond, const Address &address, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         branchTestUndefined(cond, Operand(address), label);
     }
     void branchTestInt32(Condition cond, const Operand &operand, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(ToUpper32(operand), Imm32(Upper32Of(GetShiftedTag(JSVAL_TYPE_INT32))));
         j(cond, label);
     }
     void branchTestInt32(Condition cond, const Address &address, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         branchTestInt32(cond, Operand(address), label);
     }
     void branchTestDouble(Condition cond, const Operand &operand, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         splitTag(operand, ScratchReg);
         branchTestDouble(cond, ScratchReg, label);
     }
     void branchTestDouble(Condition cond, const Address &address, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         branchTestDouble(cond, Operand(address), label);
     }
     void branchTestBoolean(Condition cond, const Operand &operand, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(ToUpper32(operand), Imm32(Upper32Of(GetShiftedTag(JSVAL_TYPE_BOOLEAN))));
         j(cond, label);
     }
     void branchTestNull(Condition cond, const Operand &operand, Label *label) {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         cmpl(ToUpper32(operand), Imm32(Upper32Of(GetShiftedTag(JSVAL_TYPE_NULL))));
         j(cond, label);
     }
     // Perform a type-test on a full Value loaded into a register.
     // Clobbers the ScratchReg.
     void branchTestUndefined(Condition cond, const ValueOperand &src, Label *label) {
         cond = testUndefined(cond, src);
         j(cond, label);
     }
     void branchTestInt32(Condition cond, const ValueOperand &src, Label *label) {
         splitTag(src, ScratchReg);
         branchTestInt32(cond, ScratchReg, label);
     }
     void branchTestBoolean(Condition cond, const ValueOperand &src, Label *label) {
         splitTag(src, ScratchReg);
         branchTestBoolean(cond, ScratchReg, label);
     }
     void branchTestDouble(Condition cond, const ValueOperand &src, Label *label) {
         cond = testDouble(cond, src);
         j(cond, label);
     }
     void branchTestNull(Condition cond, const ValueOperand &src, Label *label) {
         cond = testNull(cond, src);
         j(cond, label);
     }
     void branchTestString(Condition cond, const ValueOperand &src, Label *label) {
         cond = testString(cond, src);
         j(cond, label);
     }
     void branchTestObject(Condition cond, const ValueOperand &src, Label *label) {
         cond = testObject(cond, src);
         j(cond, label);
     }
     void branchTestNumber(Condition cond, const ValueOperand &src, Label *label) {
         cond = testNumber(cond, src);
         j(cond, label);
     }
     // Perform a type-test on a Value addressed by BaseIndex.
     // Clobbers the ScratchReg.
     void branchTestUndefined(Condition cond, const BaseIndex &address, Label *label) {
         cond = testUndefined(cond, address);
         j(cond, label);
     }
     void branchTestInt32(Condition cond, const BaseIndex &address, Label *label) {
         splitTag(address, ScratchReg);
         branchTestInt32(cond, ScratchReg, label);
     }
     void branchTestBoolean(Condition cond, const BaseIndex &address, Label *label) {
         splitTag(address, ScratchReg);
         branchTestBoolean(cond, ScratchReg, label);
     }
     void branchTestDouble(Condition cond, const BaseIndex &address, Label *label) {
         cond = testDouble(cond, address);
         j(cond, label);
     }
     void branchTestNull(Condition cond, const BaseIndex &address, Label *label) {
         cond = testNull(cond, address);
         j(cond, label);
     }
     void branchTestString(Condition cond, const BaseIndex &address, Label *label) {
         cond = testString(cond, address);
         j(cond, label);
     }
     void branchTestObject(Condition cond, const BaseIndex &address, Label *label) {
         cond = testObject(cond, address);
         j(cond, label);
     }
     template <typename T>
     void branchTestGCThing(Condition cond, const T &src, Label *label) {
         cond = testGCThing(cond, src);
         j(cond, label);
     }
     template <typename T>
     void branchTestPrimitive(Condition cond, const T &t, Label *label) {
         cond = testPrimitive(cond, t);
         j(cond, label);
     }
     template <typename T>
     void branchTestMagic(Condition cond, const T &t, Label *label) {
         cond = testMagic(cond, t);
         j(cond, label);
     }
     void branchTestMagicValue(Condition cond, const ValueOperand &val, JSWhyMagic why,
                               Label *label)
     {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         // Test for magic
         Label notmagic;
         Condition testCond = testMagic(cond, val);
         j(InvertCondition(testCond), &notmagic);
         // Test magic value
         unboxMagic(val, ScratchReg);
         branch32(cond, ScratchReg, Imm32(static_cast<int32_t>(why)), label);
         bind(&notmagic);
     }
     Condition testMagic(Condition cond, const ValueOperand &src) {
         splitTag(src, ScratchReg);
         return testMagic(cond, ScratchReg);
     }
     Condition testError(Condition cond, const ValueOperand &src) {
         return testMagic(cond, src);
     }
     void branchTestValue(Condition cond, const ValueOperand &value, const Value &v, Label *label) {
         JS_ASSERT(value.valueReg() != ScratchReg);
         moveValue(v, ScratchReg);
         cmpq(value.valueReg(), ScratchReg);
         j(cond, label);
     }
     void branchTestValue(Condition cond, const Address &valaddr, const ValueOperand &value,
                          Label *label)
     {
         JS_ASSERT(cond == Equal || cond == NotEqual);
         branchPtr(cond, valaddr, value.valueReg(), label);
     }
     void testNullSet(Condition cond, const ValueOperand &value, Register dest) {
         cond = testNull(cond, value);
         emitSet(cond, dest);
     }
     void testUndefinedSet(Condition cond, const ValueOperand &value, Register dest) {
         cond = testUndefined(cond, value);
         emitSet(cond, dest);
     }
     void boxDouble(const FloatRegister &src, const ValueOperand &dest) {
         movq(src, dest.valueReg());
     }
     void boxNonDouble(JSValueType type, const Register &src, const ValueOperand &dest) {
         JS_ASSERT(src != dest.valueReg());
         boxValue(type, src, dest.valueReg());
     }
     // Note that the |dest| register here may be ScratchReg, so we shouldn't
     // use it.
     void unboxInt32(const ValueOperand &src, const Register &dest) {
         movl(src.valueReg(), dest);
     }
     void unboxInt32(const Operand &src, const Register &dest) {
         movl(src, dest);
     }
     void unboxInt32(const Address &src, const Register &dest) {
         unboxInt32(Operand(src), dest);
     }
     void unboxDouble(const Address &src, const FloatRegister &dest) {
         loadDouble(Operand(src), dest);
     }
     void unboxArgObjMagic(const ValueOperand &src, const Register &dest) {
         unboxArgObjMagic(Operand(src.valueReg()), dest);
     }
     void unboxArgObjMagic(const Operand &src, const Register &dest) {
         mov(ImmWord(0), dest);
     }
     void unboxArgObjMagic(const Address &src, const Register &dest) {
         unboxArgObjMagic(Operand(src), dest);
     }
     void unboxBoolean(const ValueOperand &src, const Register &dest) {
         movl(src.valueReg(), dest);
     }
     void unboxBoolean(const Operand &src, const Register &dest) {
         movl(src, dest);
     }
     void unboxBoolean(const Address &src, const Register &dest) {
         unboxBoolean(Operand(src), dest);
     }
     void unboxMagic(const ValueOperand &src, const Register &dest) {
         movl(src.valueReg(), dest);
     }
     void unboxDouble(const ValueOperand &src, const FloatRegister &dest) {
         movq(src.valueReg(), dest);
     }
     void unboxPrivate(const ValueOperand &src, const Register dest) {
         movq(src.valueReg(), dest);
         shlq(Imm32(1), dest);
     }
     void notBoolean(const ValueOperand &val) {
         xorq(Imm32(1), val.valueReg());
     }
     // Unbox any non-double value into dest. Prefer unboxInt32 or unboxBoolean
     // instead if the source type is known.
     void unboxNonDouble(const ValueOperand &src, const Register &dest) {
         // In a non-trivial coupling, we're not permitted to use ScratchReg when
         // src and dest are different registers, because of how extractObject is
         // implemented.
         if (src.valueReg() == dest) {
             mov(ImmWord(JSVAL_PAYLOAD_MASK), ScratchReg);
             andq(ScratchReg, dest);
         } else {
             mov(ImmWord(JSVAL_PAYLOAD_MASK), dest);
             andq(src.valueReg(), dest);
         }
     }
     void unboxNonDouble(const Operand &src, const Register &dest) {
         // Explicitly permits |dest| to be used in |src|.
         JS_ASSERT(dest != ScratchReg);
         mov(ImmWord(JSVAL_PAYLOAD_MASK), ScratchReg);
         movq(src, dest);
         andq(ScratchReg, dest);
     }
     void unboxString(const ValueOperand &src, const Register &dest) { unboxNonDouble(src, dest); }
     void unboxString(const Operand &src, const Register &dest) { unboxNonDouble(src, dest); }
     void unboxObject(const ValueOperand &src, const Register &dest) { unboxNonDouble(src, dest); }
     void unboxObject(const Operand &src, const Register &dest) { unboxNonDouble(src, dest); }
     // Extended unboxing API. If the payload is already in a register, returns
     // that register. Otherwise, provides a move to the given scratch register,
     // and returns that.
     Register extractObject(const Address &address, Register scratch) {
         JS_ASSERT(scratch != ScratchReg);
         loadPtr(address, ScratchReg);
         // We have a special coupling with unboxObject. As long as the registers
         // aren't equal, it doesn't use ScratchReg.
         unboxObject(ValueOperand(ScratchReg), scratch);
         return scratch;
     }
     Register extractObject(const ValueOperand &value, Register scratch) {
         JS_ASSERT(scratch != ScratchReg);
         unboxObject(value, scratch);
         return scratch;
     }
     Register extractInt32(const ValueOperand &value, Register scratch) {
         JS_ASSERT(scratch != ScratchReg);
         unboxInt32(value, scratch);
         return scratch;
     }
     Register extractBoolean(const ValueOperand &value, Register scratch) {
         JS_ASSERT(scratch != ScratchReg);
         unboxBoolean(value, scratch);
         return scratch;
     }
     Register extractTag(const Address &address, Register scratch) {
         JS_ASSERT(scratch != ScratchReg);
         loadPtr(address, scratch);
         splitTag(scratch, scratch);
         return scratch;
     }
     Register extractTag(const ValueOperand &value, Register scratch) {
         JS_ASSERT(scratch != ScratchReg);
         splitTag(value, scratch);
         return scratch;
     }
     void unboxValue(const ValueOperand &src, AnyRegister dest) {
         if (dest.isFloat()) {
             Label notInt32, end;
             branchTestInt32(Assembler::NotEqual, src, &notInt32);
             convertInt32ToDouble(src.valueReg(), dest.fpu());
             jump(&end);
             bind(&notInt32);
             unboxDouble(src, dest.fpu());
             bind(&end);
         } else {
             unboxNonDouble(src, dest.gpr());
         }
     }
     // These two functions use the low 32-bits of the full value register.
     void boolValueToDouble(const ValueOperand &operand, const FloatRegister &dest) {
         convertInt32ToDouble(operand.valueReg(), dest);
     }
     void int32ValueToDouble(const ValueOperand &operand, const FloatRegister &dest) {
         convertInt32ToDouble(operand.valueReg(), dest);
     }
     void boolValueToFloat32(const ValueOperand &operand, const FloatRegister &dest) {
         convertInt32ToFloat32(operand.valueReg(), dest);
     }
     void int32ValueToFloat32(const ValueOperand &operand, const FloatRegister &dest) {
         convertInt32ToFloat32(operand.valueReg(), dest);
     }
     void loadConstantDouble(double d, const FloatRegister &dest);
     void loadConstantFloat32(float f, const FloatRegister &dest);
     void branchTruncateDouble(const FloatRegister &src, const Register &dest, Label *fail) {
         cvttsd2sq(src, dest);
         // cvttsd2sq returns 0x8000000000000000 on failure. Test for it by
         // subtracting 1 and testing overflow (this avoids the need to
         // materialize that value in a register).
         cmpq(dest, Imm32(1));
         j(Assembler::Overflow, fail);
         movl(dest, dest); // Zero upper 32-bits.
     }
     void branchTruncateFloat32(const FloatRegister &src, const Register &dest, Label *fail) {
         cvttss2sq(src, dest);
         // Same trick as for Doubles
         cmpq(dest, Imm32(1));
         j(Assembler::Overflow, fail);
         movl(dest, dest); // Zero upper 32-bits.
     }
     Condition testInt32Truthy(bool truthy, const ValueOperand &operand) {
         testl(operand.valueReg(), operand.valueReg());
         return truthy ? NonZero : Zero;
     }
     void branchTestInt32Truthy(bool truthy, const ValueOperand &operand, Label *label) {
         Condition cond = testInt32Truthy(truthy, operand);
         j(cond, label);
     }
     void branchTestBooleanTruthy(bool truthy, const ValueOperand &operand, Label *label) {
         testl(operand.valueReg(), operand.valueReg());
         j(truthy ? NonZero : Zero, label);
     }
     Condition testStringTruthy(bool truthy, const ValueOperand &value) {
         unboxString(value, ScratchReg);
         Operand lengthAndFlags(ScratchReg, JSString::offsetOfLengthAndFlags());
         testq(lengthAndFlags, Imm32(-1 << JSString::LENGTH_SHIFT));
         return truthy ? Assembler::NonZero : Assembler::Zero;
     }
     void branchTestStringTruthy(bool truthy, const ValueOperand &value, Label *label) {
         Condition cond = testStringTruthy(truthy, value);
         j(cond, label);
     }
     void loadInt32OrDouble(const Operand &operand, const FloatRegister &dest) {
         Label notInt32, end;
         branchTestInt32(Assembler::NotEqual, operand, &notInt32);
         convertInt32ToDouble(operand, dest);
         jump(&end);
         bind(&notInt32);
         loadDouble(operand, dest);
         bind(&end);
     }
     template <typename T>
     void loadUnboxedValue(const T &src, MIRType type, AnyRegister dest) {
         if (dest.isFloat())
             loadInt32OrDouble(Operand(src), dest.fpu());
         else if (type == MIRType_Int32 || type == MIRType_Boolean)
             movl(Operand(src), dest.gpr());
         else
             unboxNonDouble(Operand(src), dest.gpr());
     }
     void loadInstructionPointerAfterCall(const Register &dest) {
         loadPtr(Address(StackPointer, 0x0), dest);
     }
     void convertUInt32ToDouble(const Register &src, const FloatRegister &dest) {
         cvtsq2sd(src, dest);
     }
     void convertUInt32ToFloat32(const Register &src, const FloatRegister &dest) {
         cvtsq2ss(src, dest);
     }
     void inc64(AbsoluteAddress dest) {
         if (JSC::X86Assembler::isAddressImmediate(dest.addr)) {
             addPtr(Imm32(1), Operand(dest));
         } else {
             mov(ImmPtr(dest.addr), ScratchReg);
             addPtr(Imm32(1), Address(ScratchReg, 0));
         }
     }
     // If source is a double, load it into dest. If source is int32,
     // convert it to double. Else, branch to failure.
     void ensureDouble(const ValueOperand &source, FloatRegister dest, Label *failure) {
         Label isDouble, done;
         Register tag = splitTagForTest(source);
         branchTestDouble(Assembler::Equal, tag, &isDouble);
         branchTestInt32(Assembler::NotEqual, tag, failure);
         unboxInt32(source, ScratchReg);
         convertInt32ToDouble(ScratchReg, dest);
         jump(&done);
         bind(&isDouble);
         unboxDouble(source, dest);
         bind(&done);
     }
     // Setup a call to C/C++ code, given the number of general arguments it
     // takes. Note that this only supports cdecl.
     //
     // In order for alignment to work correctly, the MacroAssembler must have a
     // consistent view of the stack displacement. It is okay to call "push"
     // manually, however, if the stack alignment were to change, the macro
     // assembler should be notified before starting a call.
     void setupAlignedABICall(uint32_t args);
     // Sets up an ABI call for when the alignment is not known. This may need a
     // scratch register.
     void setupUnalignedABICall(uint32_t args, const Register &scratch);
     // Arguments must be assigned to a C/C++ call in order. They are moved
     // in parallel immediately before performing the call. This process may
     // temporarily use more stack, in which case esp-relative addresses will be
     // automatically adjusted. It is extremely important that esp-relative
     // addresses are computed *after* setupABICall(). Furthermore, no
     // operations should be emitted while setting arguments.
     void passABIArg(const MoveOperand &from, MoveOp::Type type);
     void passABIArg(const Register &reg);
     void passABIArg(const FloatRegister &reg, MoveOp::Type type);
   private:
     void callWithABIPre(uint32_t *stackAdjust);
     void callWithABIPost(uint32_t stackAdjust, MoveOp::Type result);
   public:
     // Emits a call to a C/C++ function, resolving all argument moves.
     void callWithABI(void *fun, MoveOp::Type result = MoveOp::GENERAL);
     void callWithABI(AsmJSImmPtr imm, MoveOp::Type result = MoveOp::GENERAL);
     void callWithABI(Address fun, MoveOp::Type result = MoveOp::GENERAL);
     void handleFailureWithHandler(void *handler);
     void handleFailureWithHandlerTail();
     void makeFrameDescriptor(Register frameSizeReg, FrameType type) {
         shlq(Imm32(FRAMESIZE_SHIFT), frameSizeReg);
         orq(Imm32(type), frameSizeReg);
     }
     // Save an exit frame (which must be aligned to the stack pointer) to
     // ThreadData::ionTop of the main thread.
     void linkExitFrame() {
         storePtr(StackPointer,
                  AbsoluteAddress(GetIonContext()->runtime->addressOfIonTop()));
     }
     void callWithExitFrame(JitCode *target, Register dynStack) {
         addPtr(Imm32(framePushed()), dynStack);
         makeFrameDescriptor(dynStack, JitFrame_IonJS);
         Push(dynStack);
         call(target);
     }
     // Save an exit frame to the thread data of the current thread, given a
     // register that holds a PerThreadData *.
     void linkParallelExitFrame(const Register &pt) {
         storePtr(StackPointer, Address(pt, offsetof(PerThreadData, ionTop)));
     }
     // See CodeGeneratorX64 calls to noteAsmJSGlobalAccess.
     void patchAsmJSGlobalAccess(CodeOffsetLabel patchAt, uint8_t *code, uint8_t *globalData,
                                 unsigned globalDataOffset)
     {
         uint8_t *nextInsn = code + patchAt.offset();
         JS_ASSERT(nextInsn <= globalData);
         uint8_t *target = globalData + globalDataOffset;
         ((int32_t *)nextInsn)[-1] = target - nextInsn;
     }
     void memIntToValue(Address Source, Address Dest) {
         load32(Source, ScratchReg);
         storeValue(JSVAL_TYPE_INT32, ScratchReg, Dest);
     }
 #ifdef JSGC_GENERATIONAL
     void branchPtrInNurseryRange(Register ptr, Register temp, Label *label);
     void branchValueIsNurseryObject(ValueOperand value, Register temp, Label *label);
 #endif
 };
 typedef MacroAssemblerX64 MacroAssemblerSpecific;
 } // namespace jit
 } // namespace js
 #endif /* jit_x64_MacroAssembler_x64_h */

The Tor Browser / annotate

js/src/jit/x64/MacroAssembler-x64.h@6474c204b198 (annotated)

js/src/jit/x64/MacroAssembler-x64.h