path: root/js/src/jit/x86/MacroAssembler-x86.h

/* -*- 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_x86_MacroAssembler_x86_h
#define jit_x86_MacroAssembler_x86_h

#include "jscompartment.h"

#include "jit/JitFrames.h"
#include "jit/MoveResolver.h"
#include "jit/x86-shared/MacroAssembler-x86-shared.h"

namespace js {
namespace jit {

class MacroAssemblerX86 : public MacroAssemblerX86Shared
{
  private:
    // Perform a downcast. Should be removed by Bug 996602.
    MacroAssembler& asMasm();
    const MacroAssembler& asMasm() const;

  protected:
    MoveResolver moveResolver_;

  private:
    Operand payloadOfAfterStackPush(const Address& address) {
        // If we are basing off %esp, the address will be invalid after the
        // first push.
        if (address.base == StackPointer)
            return Operand(address.base, address.offset + 4);
        return payloadOf(address);
    }
    Operand payloadOf(const Address& address) {
        return Operand(address.base, address.offset);
    }
    Operand payloadOf(const BaseIndex& address) {
        return Operand(address.base, address.index, address.scale, address.offset);
    }
    Operand tagOf(const Address& address) {
        return Operand(address.base, address.offset + 4);
    }
    Operand tagOf(const BaseIndex& address) {
        return Operand(address.base, address.index, address.scale, address.offset + 4);
    }

    void setupABICall(uint32_t args);

  public:
    using MacroAssemblerX86Shared::load32;
    using MacroAssemblerX86Shared::store32;
    using MacroAssemblerX86Shared::store16;
    using MacroAssemblerX86Shared::call;

    MacroAssemblerX86()
    {
    }

    // The buffer is about to be linked, make sure any constant pools or excess
    // bookkeeping has been flushed to the instruction stream.
    void finish();

    /////////////////////////////////////////////////////////////////
    // X86-specific interface.
    /////////////////////////////////////////////////////////////////

    Operand ToPayload(Operand base) {
        return base;
    }
    Address ToPayload(Address base) {
        return base;
    }
    BaseIndex ToPayload(BaseIndex base) {
        return base;
    }
    Operand ToType(Operand base) {
        switch (base.kind()) {
          case Operand::MEM_REG_DISP:
            return Operand(Register::FromCode(base.base()), base.disp() + sizeof(void*));

          case Operand::MEM_SCALE:
            return Operand(Register::FromCode(base.base()), Register::FromCode(base.index()),
                           base.scale(), base.disp() + sizeof(void*));

          default:
            MOZ_CRASH("unexpected operand kind");
        }
    }
    Address ToType(Address base) {
        return ToType(Operand(base)).toAddress();
    }
    void moveValue(const Value& val, Register type, Register data) {
        movl(Imm32(val.toNunboxTag()), type);
        if (val.isGCThing())
            movl(ImmGCPtr(val.toGCThing()), data);
        else
            movl(Imm32(val.toNunboxPayload()), data);
    }
    void moveValue(const Value& val, const ValueOperand& dest) {
        moveValue(val, dest.typeReg(), dest.payloadReg());
    }
    void moveValue(const ValueOperand& src, const ValueOperand& dest) {
        Register s0 = src.typeReg(), d0 = dest.typeReg(),
                 s1 = src.payloadReg(), d1 = dest.payloadReg();

        // Either one or both of the source registers could be the same as a
        // destination register.
        if (s1 == d0) {
            if (s0 == d1) {
                // If both are, this is just a swap of two registers.
                xchgl(d0, d1);
                return;
            }
            // If only one is, copy that source first.
            mozilla::Swap(s0, s1);
            mozilla::Swap(d0, d1);
        }

        if (s0 != d0)
            movl(s0, d0);
        if (s1 != d1)
            movl(s1, d1);
    }

    /////////////////////////////////////////////////////////////////
    // X86/X64-common interface.
    /////////////////////////////////////////////////////////////////
    void storeValue(ValueOperand val, Operand dest) {
        movl(val.payloadReg(), ToPayload(dest));
        movl(val.typeReg(), ToType(dest));
    }
    void storeValue(ValueOperand val, const Address& dest) {
        storeValue(val, Operand(dest));
    }
    template <typename T>
    void storeValue(JSValueType type, Register reg, const T& dest) {
        storeTypeTag(ImmTag(JSVAL_TYPE_TO_TAG(type)), Operand(dest));
        storePayload(reg, Operand(dest));
    }
    template <typename T>
    void storeValue(const Value& val, const T& dest) {
        storeTypeTag(ImmTag(val.toNunboxTag()), Operand(dest));
        storePayload(val, Operand(dest));
    }
    void storeValue(ValueOperand val, BaseIndex dest) {
        storeValue(val, Operand(dest));
    }
    void storeValue(const Address& src, const Address& dest, Register temp) {
        MOZ_ASSERT(src.base != temp);
        MOZ_ASSERT(dest.base != temp);

        load32(ToType(src), temp);
        store32(temp, ToType(dest));

        load32(ToPayload(src), temp);
        store32(temp, ToPayload(dest));
    }
    void loadValue(Operand src, ValueOperand val) {
        Operand payload = ToPayload(src);
        Operand type = ToType(src);

        // Ensure that loading the payload does not erase the pointer to the
        // Value in memory or the index.
        Register baseReg = Register::FromCode(src.base());
        Register indexReg = (src.kind() == Operand::MEM_SCALE) ? Register::FromCode(src.index()) : InvalidReg;

        // If we have a BaseIndex that uses both result registers, first compute
        // the address and then load the Value from there.
        if ((baseReg == val.payloadReg() && indexReg == val.typeReg()) ||
            (baseReg == val.typeReg() && indexReg == val.payloadReg()))
        {
            computeEffectiveAddress(src, val.scratchReg());
            loadValue(Address(val.scratchReg(), 0), val);
            return;
        }

        if (baseReg == val.payloadReg() || indexReg == val.payloadReg()) {
            MOZ_ASSERT(baseReg != val.typeReg());
            MOZ_ASSERT(indexReg != val.typeReg());

            movl(type, val.typeReg());
            movl(payload, val.payloadReg());
        } else {
            MOZ_ASSERT(baseReg != val.payloadReg());
            MOZ_ASSERT(indexReg != val.payloadReg());

            movl(payload, val.payloadReg());
            movl(type, val.typeReg());
        }
    }
    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) {
        MOZ_ASSERT(dest.typeReg() != dest.payloadReg());
        if (payload != dest.payloadReg())
            movl(payload, dest.payloadReg());
        movl(ImmType(type), dest.typeReg());
    }
    void pushValue(ValueOperand val) {
        push(val.typeReg());
        push(val.payloadReg());
    }
    void popValue(ValueOperand val) {
        pop(val.payloadReg());
        pop(val.typeReg());
    }
    void pushValue(const Value& val) {
        push(Imm32(val.toNunboxTag()));
        if (val.isGCThing())
            push(ImmGCPtr(val.toGCThing()));
        else
            push(Imm32(val.toNunboxPayload()));
    }
    void pushValue(JSValueType type, Register reg) {
        push(ImmTag(JSVAL_TYPE_TO_TAG(type)));
        push(reg);
    }
    void pushValue(const Address& addr) {
        push(tagOf(addr));
        push(payloadOfAfterStackPush(addr));
    }
    void push64(Register64 src) {
        push(src.high);
        push(src.low);
    }
    void pop64(Register64 dest) {
        pop(dest.low);
        pop(dest.high);
    }
    void storePayload(const Value& val, Operand dest) {
        if (val.isGCThing())
            movl(ImmGCPtr(val.toGCThing()), ToPayload(dest));
        else
            movl(Imm32(val.toNunboxPayload()), ToPayload(dest));
    }
    void storePayload(Register src, Operand dest) {
        movl(src, ToPayload(dest));
    }
    void storeTypeTag(ImmTag tag, Operand dest) {
        movl(tag, ToType(dest));
    }

    void movePtr(Register src, Register dest) {
        movl(src, dest);
    }
    void movePtr(Register src, const Operand& dest) {
        movl(src, dest);
    }

    // Returns the register containing the type tag.
    Register splitTagForTest(const ValueOperand& value) {
        return value.typeReg();
    }

    Condition testUndefined(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_UNDEFINED));
        return cond;
    }
    Condition testBoolean(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_BOOLEAN));
        return cond;
    }
    Condition testInt32(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_INT32));
        return cond;
    }
    Condition testDouble(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Assembler::Equal || cond == Assembler::NotEqual);
        Condition actual = (cond == Equal) ? Below : AboveOrEqual;
        cmp32(tag, ImmTag(JSVAL_TAG_CLEAR));
        return actual;
    }
    Condition testNull(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_NULL));
        return cond;
    }
    Condition testString(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_STRING));
        return cond;
    }
    Condition testSymbol(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_SYMBOL));
        return cond;
    }
    Condition testObject(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_OBJECT));
        return cond;
    }
    Condition testNumber(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET));
        return cond == Equal ? BelowOrEqual : Above;
    }
    Condition testGCThing(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET));
        return cond == Equal ? AboveOrEqual : Below;
    }
    Condition testGCThing(Condition cond, const Address& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET));
        return cond == Equal ? AboveOrEqual : Below;
    }
    Condition testMagic(Condition cond, const Address& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_MAGIC));
        return cond;
    }
    Condition testMagic(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_TAG_MAGIC));
        return cond;
    }
    Condition testMagic(Condition cond, const Operand& operand) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(ToType(operand), ImmTag(JSVAL_TAG_MAGIC));
        return cond;
    }
    Condition testPrimitive(Condition cond, Register tag) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tag, ImmTag(JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET));
        return cond == Equal ? Below : AboveOrEqual;
    }
    Condition testError(Condition cond, Register tag) {
        return testMagic(cond, tag);
    }
    Condition testBoolean(Condition cond, const Address& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(Operand(ToType(address)), ImmTag(JSVAL_TAG_BOOLEAN));
        return cond;
    }
    Condition testInt32(Condition cond, const Operand& operand) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(ToType(operand), ImmTag(JSVAL_TAG_INT32));
        return cond;
    }
    Condition testInt32(Condition cond, const Address& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        return testInt32(cond, Operand(address));
    }
    Condition testObject(Condition cond, const Operand& operand) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(ToType(operand), ImmTag(JSVAL_TAG_OBJECT));
        return cond;
    }
    Condition testObject(Condition cond, const Address& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        return testObject(cond, Operand(address));
    }
    Condition testDouble(Condition cond, const Operand& operand) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        Condition actual = (cond == Equal) ? Below : AboveOrEqual;
        cmp32(ToType(operand), ImmTag(JSVAL_TAG_CLEAR));
        return actual;
    }
    Condition testDouble(Condition cond, const Address& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        return testDouble(cond, Operand(address));
    }


    Condition testUndefined(Condition cond, const Operand& operand) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(ToType(operand), ImmTag(JSVAL_TAG_UNDEFINED));
        return cond;
    }
    Condition testUndefined(Condition cond, const Address& addr) {
        return testUndefined(cond, Operand(addr));
    }
    Condition testNull(Condition cond, const Operand& operand) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(ToType(operand), ImmTag(JSVAL_TAG_NULL));
        return cond;
    }
    Condition testNull(Condition cond, const Address& addr) {
        return testNull(cond, Operand(addr));
    }

    Condition testUndefined(Condition cond, const ValueOperand& value) {
        return testUndefined(cond, value.typeReg());
    }
    Condition testBoolean(Condition cond, const ValueOperand& value) {
        return testBoolean(cond, value.typeReg());
    }
    Condition testInt32(Condition cond, const ValueOperand& value) {
        return testInt32(cond, value.typeReg());
    }
    Condition testDouble(Condition cond, const ValueOperand& value) {
        return testDouble(cond, value.typeReg());
    }
    Condition testNull(Condition cond, const ValueOperand& value) {
        return testNull(cond, value.typeReg());
    }
    Condition testString(Condition cond, const ValueOperand& value) {
        return testString(cond, value.typeReg());
    }
    Condition testSymbol(Condition cond, const ValueOperand& value) {
        return testSymbol(cond, value.typeReg());
    }
    Condition testObject(Condition cond, const ValueOperand& value) {
        return testObject(cond, value.typeReg());
    }
    Condition testMagic(Condition cond, const ValueOperand& value) {
        return testMagic(cond, value.typeReg());
    }
    Condition testError(Condition cond, const ValueOperand& value) {
        return testMagic(cond, value);
    }
    Condition testNumber(Condition cond, const ValueOperand& value) {
        return testNumber(cond, value.typeReg());
    }
    Condition testGCThing(Condition cond, const ValueOperand& value) {
        return testGCThing(cond, value.typeReg());
    }
    Condition testPrimitive(Condition cond, const ValueOperand& value) {
        return testPrimitive(cond, value.typeReg());
    }


    Condition testUndefined(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_UNDEFINED));
        return cond;
    }
    Condition testNull(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_NULL));
        return cond;
    }
    Condition testBoolean(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_BOOLEAN));
        return cond;
    }
    Condition testString(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_STRING));
        return cond;
    }
    Condition testSymbol(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_SYMBOL));
        return cond;
    }
    Condition testInt32(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_INT32));
        return cond;
    }
    Condition testObject(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_OBJECT));
        return cond;
    }
    Condition testDouble(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        Condition actual = (cond == Equal) ? Below : AboveOrEqual;
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_CLEAR));
        return actual;
    }
    Condition testMagic(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_TAG_MAGIC));
        return cond;
    }
    Condition testGCThing(Condition cond, const BaseIndex& address) {
        MOZ_ASSERT(cond == Equal || cond == NotEqual);
        cmp32(tagOf(address), ImmTag(JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET));
        return cond == Equal ? AboveOrEqual : Below;
    }

    void testNullSet(Condition cond, const ValueOperand& value, Register dest) {
        cond = testNull(cond, value);
        emitSet(cond, dest);
    }

    void testObjectSet(Condition cond, const ValueOperand& value, Register dest) {
        cond = testObject(cond, value);
        emitSet(cond, dest);
    }

    void testUndefinedSet(Condition cond, const ValueOperand& value, Register dest) {
        cond = testUndefined(cond, value);
        emitSet(cond, dest);
    }

    void cmpPtr(Register lhs, const ImmWord rhs) {
        cmpl(Imm32(rhs.value), lhs);
    }
    void cmpPtr(Register lhs, const ImmPtr imm) {
        cmpPtr(lhs, ImmWord(uintptr_t(imm.value)));
    }
    void cmpPtr(Register lhs, const ImmGCPtr rhs) {
        cmpl(rhs, lhs);
    }
    void cmpPtr(const Operand& lhs, Imm32 rhs) {
        cmp32(lhs, rhs);
    }
    void cmpPtr(const Operand& lhs, const ImmWord rhs) {
        cmp32(lhs, Imm32(rhs.value));
    }
    void cmpPtr(const Operand& lhs, const ImmPtr imm) {
        cmpPtr(lhs, ImmWord(uintptr_t(imm.value)));
    }
    void cmpPtr(const Operand& lhs, const ImmGCPtr rhs) {
        cmpl(rhs, lhs);
    }
    void cmpPtr(const Address& lhs, Register rhs) {
        cmpPtr(Operand(lhs), rhs);
    }
    void cmpPtr(const Operand& lhs, Register rhs) {
        cmp32(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 Address& lhs, const ImmGCPtr rhs) {
        cmpPtr(Operand(lhs), rhs);
    }
    void cmpPtr(Register lhs, Register rhs) {
        cmp32(lhs, rhs);
    }
    void testPtr(Register lhs, Register rhs) {
        test32(lhs, rhs);
    }
    void testPtr(Register lhs, Imm32 rhs) {
        test32(lhs, rhs);
    }
    void testPtr(Register lhs, ImmWord rhs) {
        test32(lhs, Imm32(rhs.value));
    }
    void testPtr(const Operand& lhs, Imm32 rhs) {
        test32(lhs, rhs);
    }
    void testPtr(const Operand& lhs, ImmWord rhs) {
        test32(lhs, Imm32(rhs.value));
    }

    /////////////////////////////////////////////////////////////////
    // Common interface.
    /////////////////////////////////////////////////////////////////

    template <typename T, typename S>
    void branchPtr(Condition cond, T lhs, S ptr, RepatchLabel* label) {
        cmpPtr(Operand(lhs), ptr);
        j(cond, label);
    }

    CodeOffsetJump jumpWithPatch(RepatchLabel* label, Label* documentation = nullptr) {
        jump(label);
        return CodeOffsetJump(size());
    }

    CodeOffsetJump jumpWithPatch(RepatchLabel* label, Assembler::Condition cond,
                                 Label* documentation = nullptr)
    {
        j(cond, label);
        return CodeOffsetJump(size());
    }

    CodeOffsetJump backedgeJump(RepatchLabel* label, Label* documentation = nullptr) {
        return jumpWithPatch(label);
    }

    void branchPtr(Condition cond, Register lhs, Register rhs, RepatchLabel* label) {
        cmpPtr(lhs, rhs);
        j(cond, label);
    }

    void movePtr(ImmWord imm, Register dest) {
        movl(Imm32(imm.value), dest);
    }
    void movePtr(ImmPtr imm, Register dest) {
        movl(imm, dest);
    }
    void movePtr(wasm::SymbolicAddress imm, Register dest) {
        mov(imm, dest);
    }
    void movePtr(ImmGCPtr imm, Register dest) {
        movl(imm, dest);
    }
    void loadPtr(const Address& address, Register dest) {
        movl(Operand(address), dest);
    }
    void loadPtr(const Operand& src, Register dest) {
        movl(src, dest);
    }
    void loadPtr(const BaseIndex& src, Register dest) {
        movl(Operand(src), dest);
    }
    void loadPtr(AbsoluteAddress address, Register dest) {
        movl(Operand(address), dest);
    }
    void loadPrivate(const Address& src, Register dest) {
        movl(payloadOf(src), dest);
    }
    void load32(AbsoluteAddress address, Register dest) {
        movl(Operand(address), dest);
    }
    void load64(const Address& address, Register64 dest) {
        movl(Operand(Address(address.base, address.offset + INT64LOW_OFFSET)), dest.low);
        int32_t highOffset = (address.offset < 0) ? -int32_t(INT64HIGH_OFFSET) : INT64HIGH_OFFSET;
        movl(Operand(Address(address.base, address.offset + highOffset)), dest.high);
    }
    template <typename T>
    void storePtr(ImmWord imm, T address) {
        movl(Imm32(imm.value), Operand(address));
    }
    template <typename T>
    void storePtr(ImmPtr imm, T address) {
        storePtr(ImmWord(uintptr_t(imm.value)), address);
    }
    template <typename T>
    void storePtr(ImmGCPtr imm, T address) {
        movl(imm, Operand(address));
    }
    void storePtr(Register src, const Address& address) {
        movl(src, Operand(address));
    }
    void storePtr(Register src, const BaseIndex& address) {
        movl(src, Operand(address));
    }
    void storePtr(Register src, const Operand& dest) {
        movl(src, dest);
    }
    void storePtr(Register src, AbsoluteAddress address) {
        movl(src, Operand(address));
    }
    void store32(Register src, AbsoluteAddress address) {
        movl(src, Operand(address));
    }
    void store16(Register src, AbsoluteAddress address) {
        movw(src, Operand(address));
    }
    void store64(Register64 src, Address address) {
        movl(src.low, Operand(Address(address.base, address.offset + INT64LOW_OFFSET)));
        movl(src.high, Operand(Address(address.base, address.offset + INT64HIGH_OFFSET)));
    }
    void store64(Imm64 imm, Address address) {
        movl(imm.low(), Operand(Address(address.base, address.offset + INT64LOW_OFFSET)));
        movl(imm.hi(), Operand(Address(address.base, address.offset + INT64HIGH_OFFSET)));
    }

    void setStackArg(Register reg, uint32_t arg) {
        movl(reg, Operand(esp, arg * sizeof(intptr_t)));
    }

    // Note: this function clobbers the source register.
    void boxDouble(FloatRegister src, const ValueOperand& dest) {
        if (Assembler::HasSSE41()) {
            vmovd(src, dest.payloadReg());
            vpextrd(1, src, dest.typeReg());
        } else {
            vmovd(src, dest.payloadReg());
            vpsrldq(Imm32(4), src, src);
            vmovd(src, dest.typeReg());
        }
    }
    void boxNonDouble(JSValueType type, Register src, const ValueOperand& dest) {
        if (src != dest.payloadReg())
            movl(src, dest.payloadReg());
        movl(ImmType(type), dest.typeReg());
    }

    void unboxNonDouble(const ValueOperand& src, Register dest) {
        if (src.payloadReg() != dest)
            movl(src.payloadReg(), dest);
    }
    void unboxNonDouble(const Address& src, Register dest) {
        movl(payloadOf(src), dest);
    }
    void unboxNonDouble(const BaseIndex& src, Register dest) {
        movl(payloadOf(src), dest);
    }
    void unboxInt32(const ValueOperand& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxInt32(const Address& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxBoolean(const ValueOperand& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxBoolean(const Address& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxString(const ValueOperand& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxString(const Address& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxSymbol(const ValueOperand& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxSymbol(const Address& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxObject(const ValueOperand& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxObject(const Address& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxObject(const BaseIndex& src, Register dest) { unboxNonDouble(src, dest); }
    void unboxDouble(const Address& src, FloatRegister dest) {
        loadDouble(Operand(src), dest);
    }
    void unboxDouble(const ValueOperand& src, FloatRegister dest) {
        MOZ_ASSERT(dest != ScratchDoubleReg);
        if (Assembler::HasSSE41()) {
            vmovd(src.payloadReg(), dest);
            vpinsrd(1, src.typeReg(), dest, dest);
        } else {
            vmovd(src.payloadReg(), dest);
            vmovd(src.typeReg(), ScratchDoubleReg);
            vunpcklps(ScratchDoubleReg, dest, dest);
        }
    }
    void unboxDouble(const Operand& payload, const Operand& type,
                     Register scratch, FloatRegister dest) {
        MOZ_ASSERT(dest != ScratchDoubleReg);
        if (Assembler::HasSSE41()) {
            movl(payload, scratch);
            vmovd(scratch, dest);
            movl(type, scratch);
            vpinsrd(1, scratch, dest, dest);
        } else {
            movl(payload, scratch);
            vmovd(scratch, dest);
            movl(type, scratch);
            vmovd(scratch, ScratchDoubleReg);
            vunpcklps(ScratchDoubleReg, dest, dest);
        }
    }
    inline void unboxValue(const ValueOperand& src, AnyRegister dest);
    void unboxPrivate(const ValueOperand& src, Register dest) {
        if (src.payloadReg() != dest)
            movl(src.payloadReg(), dest);
    }

    void notBoolean(const ValueOperand& val) {
        xorl(Imm32(1), val.payloadReg());
    }

    // 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) {
        movl(payloadOf(address), scratch);
        return scratch;
    }
    Register extractObject(const ValueOperand& value, Register scratch) {
        return value.payloadReg();
    }
    Register extractInt32(const ValueOperand& value, Register scratch) {
        return value.payloadReg();
    }
    Register extractBoolean(const ValueOperand& value, Register scratch) {
        return value.payloadReg();
    }
    Register extractTag(const Address& address, Register scratch) {
        movl(tagOf(address), scratch);
        return scratch;
    }
    Register extractTag(const ValueOperand& value, Register scratch) {
        return value.typeReg();
    }

    void boolValueToDouble(const ValueOperand& operand, FloatRegister dest) {
        convertInt32ToDouble(operand.payloadReg(), dest);
    }
    void boolValueToFloat32(const ValueOperand& operand, FloatRegister dest) {
        convertInt32ToFloat32(operand.payloadReg(), dest);
    }
    void int32ValueToDouble(const ValueOperand& operand, FloatRegister dest) {
        convertInt32ToDouble(operand.payloadReg(), dest);
    }
    void int32ValueToFloat32(const ValueOperand& operand, FloatRegister dest) {
        convertInt32ToFloat32(operand.payloadReg(), dest);
    }

    void loadConstantDouble(double d, FloatRegister dest);
    void loadConstantFloat32(float f, FloatRegister dest);
    void loadConstantDouble(wasm::RawF64 d, FloatRegister dest);
    void loadConstantFloat32(wasm::RawF32 f, FloatRegister dest);

    void loadConstantSimd128Int(const SimdConstant& v, FloatRegister dest);
    void loadConstantSimd128Float(const SimdConstant& v, FloatRegister dest);

    Condition testInt32Truthy(bool truthy, const ValueOperand& operand) {
        test32(operand.payloadReg(), operand.payloadReg());
        return truthy ? NonZero : Zero;
    }
    Condition testStringTruthy(bool truthy, const ValueOperand& value) {
        Register string = value.payloadReg();
        cmp32(Operand(string, JSString::offsetOfLength()), Imm32(0));
        return truthy ? Assembler::NotEqual : Assembler::Equal;
    }

    template <typename T>
    inline void loadInt32OrDouble(const T& src, FloatRegister dest);

    template <typename T>
    inline void loadUnboxedValue(const T& src, MIRType type, AnyRegister dest);

    template <typename T>
    void storeUnboxedPayload(ValueOperand value, T address, size_t nbytes) {
        switch (nbytes) {
          case 4:
            storePtr(value.payloadReg(), address);
            return;
          case 1:
            store8(value.payloadReg(), address);
            return;
          default: MOZ_CRASH("Bad payload width");
        }
    }

    void loadInstructionPointerAfterCall(Register dest) {
        movl(Operand(StackPointer, 0x0), dest);
    }

    // Note: this function clobbers the source register.
    inline void convertUInt32ToDouble(Register src, FloatRegister dest);

    // Note: this function clobbers the source register.
    inline void convertUInt32ToFloat32(Register src, FloatRegister dest);

    void convertUInt64ToFloat32(Register64 src, FloatRegister dest, Register temp);
    void convertInt64ToFloat32(Register64 src, FloatRegister dest);
    static bool convertUInt64ToDoubleNeedsTemp();
    void convertUInt64ToDouble(Register64 src, FloatRegister dest, Register temp);
    void convertInt64ToDouble(Register64 src, FloatRegister dest);

    void wasmTruncateDoubleToInt64(FloatRegister input, Register64 output, Label* oolEntry,
                                   Label* oolRejoin, FloatRegister tempDouble);
    void wasmTruncateDoubleToUInt64(FloatRegister input, Register64 output, Label* oolEntry,
                                    Label* oolRejoin, FloatRegister tempDouble);
    void wasmTruncateFloat32ToInt64(FloatRegister input, Register64 output, Label* oolEntry,
                                    Label* oolRejoin, FloatRegister tempDouble);
    void wasmTruncateFloat32ToUInt64(FloatRegister input, Register64 output, Label* oolEntry,
                                     Label* oolRejoin, FloatRegister tempDouble);

    void incrementInt32Value(const Address& addr) {
        addl(Imm32(1), payloadOf(addr));
    }

    inline void ensureDouble(const ValueOperand& source, FloatRegister dest, Label* failure);

    void loadWasmGlobalPtr(uint32_t globalDataOffset, Register dest) {
        CodeOffset label = movlWithPatch(PatchedAbsoluteAddress(), dest);
        append(wasm::GlobalAccess(label, globalDataOffset));
    }
    void loadWasmPinnedRegsFromTls() {
        // x86 doesn't have any pinned registers.
    }

  public:
    // Used from within an Exit frame to handle a pending exception.
    void handleFailureWithHandlerTail(void* handler);

    // Instrumentation for entering and leaving the profiler.
    void profilerEnterFrame(Register framePtr, Register scratch);
    void profilerExitFrame();
};

typedef MacroAssemblerX86 MacroAssemblerSpecific;

} // namespace jit
} // namespace js

#endif /* jit_x86_MacroAssembler_x86_h */