js/src/jit/mips64/MacroAssembler-mips64.h
author Jan de Mooij <jdemooij@mozilla.com>
Wed, 15 May 2019 07:42:50 +0000
changeset 532727 e00d479b6a92650637b9347d9ae18bd8da3b9493
parent 532595 9afa1dcd247b1d206f66e31290cec79f11dbf6c9
permissions -rw-r--r--
Bug 1541404 part 28 - Fix ARM issues. r=tcampbell 1. We can't use loadValue for JSOP_DOUBLE because on ARM that might use LDRD or LDM and these are not guaranteed to support unaligned loads. Fix is to add loadUnalignedValue that always uses plain 32-bit loads. 2. DebugTrapHandler's fast path for the interpreter used "lr" as second scratch register, clobbering the return address. The setSecondScratchRegister mechanism prevents this. Differential Revision: https://phabricator.services.mozilla.com/D30879

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 * 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_mips64_MacroAssembler_mips64_h
#define jit_mips64_MacroAssembler_mips64_h

#include "jit/JitFrames.h"
#include "jit/mips-shared/MacroAssembler-mips-shared.h"
#include "jit/MoveResolver.h"
#include "vm/BytecodeUtil.h"

namespace js {
namespace jit {

enum LiFlags {
  Li64 = 0,
  Li48 = 1,
};

struct ImmShiftedTag : public ImmWord {
  explicit ImmShiftedTag(JSValueShiftedTag shtag) : ImmWord((uintptr_t)shtag) {}

  explicit ImmShiftedTag(JSValueType type)
      : ImmWord(uintptr_t(JSValueShiftedTag(JSVAL_TYPE_TO_SHIFTED_TAG(type)))) {
  }
};

struct ImmTag : public Imm32 {
  ImmTag(JSValueTag mask) : Imm32(int32_t(mask)) {}
};

static constexpr ValueOperand JSReturnOperand{JSReturnReg};

static const int defaultShift = 3;
static_assert(1 << defaultShift == sizeof(JS::Value),
              "The defaultShift is wrong");

// See documentation for ScratchTagScope and ScratchTagScopeRelease in
// MacroAssembler-x64.h.

class ScratchTagScope : public SecondScratchRegisterScope {
 public:
  ScratchTagScope(MacroAssembler& masm, const ValueOperand&)
      : SecondScratchRegisterScope(masm) {}
};

class ScratchTagScopeRelease {
  ScratchTagScope* ts_;

 public:
  explicit ScratchTagScopeRelease(ScratchTagScope* ts) : ts_(ts) {
    ts_->release();
  }
  ~ScratchTagScopeRelease() { ts_->reacquire(); }
};

class MacroAssemblerMIPS64 : public MacroAssemblerMIPSShared {
 public:
  using MacroAssemblerMIPSShared::ma_b;
  using MacroAssemblerMIPSShared::ma_cmp_set;
  using MacroAssemblerMIPSShared::ma_ld;
  using MacroAssemblerMIPSShared::ma_li;
  using MacroAssemblerMIPSShared::ma_load;
  using MacroAssemblerMIPSShared::ma_ls;
  using MacroAssemblerMIPSShared::ma_sd;
  using MacroAssemblerMIPSShared::ma_ss;
  using MacroAssemblerMIPSShared::ma_store;
  using MacroAssemblerMIPSShared::ma_subTestOverflow;

  void ma_li(Register dest, CodeLabel* label);
  void ma_li(Register dest, ImmWord imm);
  void ma_liPatchable(Register dest, ImmPtr imm);
  void ma_liPatchable(Register dest, ImmWord imm, LiFlags flags = Li48);

  // Negate
  void ma_dnegu(Register rd, Register rs);

  // Shift operations
  void ma_dsll(Register rd, Register rt, Imm32 shift);
  void ma_dsrl(Register rd, Register rt, Imm32 shift);
  void ma_dsra(Register rd, Register rt, Imm32 shift);
  void ma_dror(Register rd, Register rt, Imm32 shift);
  void ma_drol(Register rd, Register rt, Imm32 shift);

  void ma_dsll(Register rd, Register rt, Register shift);
  void ma_dsrl(Register rd, Register rt, Register shift);
  void ma_dsra(Register rd, Register rt, Register shift);
  void ma_dror(Register rd, Register rt, Register shift);
  void ma_drol(Register rd, Register rt, Register shift);

  void ma_dins(Register rt, Register rs, Imm32 pos, Imm32 size);
  void ma_dext(Register rt, Register rs, Imm32 pos, Imm32 size);

  void ma_dctz(Register rd, Register rs);

  // load
  void ma_load(Register dest, Address address, LoadStoreSize size = SizeWord,
               LoadStoreExtension extension = SignExtend);

  // store
  void ma_store(Register data, Address address, LoadStoreSize size = SizeWord,
                LoadStoreExtension extension = SignExtend);

  // arithmetic based ops
  // add
  void ma_daddu(Register rd, Register rs, Imm32 imm);
  void ma_daddu(Register rd, Register rs);
  void ma_daddu(Register rd, Imm32 imm);
  void ma_addTestOverflow(Register rd, Register rs, Register rt,
                          Label* overflow);
  void ma_addTestOverflow(Register rd, Register rs, Imm32 imm, Label* overflow);

  // subtract
  void ma_dsubu(Register rd, Register rs, Imm32 imm);
  void ma_dsubu(Register rd, Register rs);
  void ma_dsubu(Register rd, Imm32 imm);
  void ma_subTestOverflow(Register rd, Register rs, Register rt,
                          Label* overflow);

  // multiplies.  For now, there are only few that we care about.
  void ma_dmult(Register rs, Imm32 imm);

  // stack
  void ma_pop(Register r);
  void ma_push(Register r);

  void branchWithCode(InstImm code, Label* label, JumpKind jumpKind);
  // branches when done from within mips-specific code
  void ma_b(Register lhs, ImmWord imm, Label* l, Condition c,
            JumpKind jumpKind = LongJump);
  void ma_b(Register lhs, Address addr, Label* l, Condition c,
            JumpKind jumpKind = LongJump);
  void ma_b(Address addr, Imm32 imm, Label* l, Condition c,
            JumpKind jumpKind = LongJump);
  void ma_b(Address addr, ImmGCPtr imm, Label* l, Condition c,
            JumpKind jumpKind = LongJump);
  void ma_b(Address addr, Register rhs, Label* l, Condition c,
            JumpKind jumpKind = LongJump) {
    MOZ_ASSERT(rhs != ScratchRegister);
    ma_load(ScratchRegister, addr, SizeDouble);
    ma_b(ScratchRegister, rhs, l, c, jumpKind);
  }

  void ma_bal(Label* l, DelaySlotFill delaySlotFill = FillDelaySlot);

  // fp instructions
  void ma_lid(FloatRegister dest, double value);

  void ma_mv(FloatRegister src, ValueOperand dest);
  void ma_mv(ValueOperand src, FloatRegister dest);

  void ma_ls(FloatRegister ft, Address address);
  void ma_ld(FloatRegister ft, Address address);
  void ma_sd(FloatRegister ft, Address address);
  void ma_ss(FloatRegister ft, Address address);

  void ma_pop(FloatRegister f);
  void ma_push(FloatRegister f);

  void ma_cmp_set(Register dst, Register lhs, ImmWord imm, Condition c);
  void ma_cmp_set(Register dst, Register lhs, ImmPtr imm, Condition c);

  // These functions abstract the access to high part of the double precision
  // float register. They are intended to work on both 32 bit and 64 bit
  // floating point coprocessor.
  void moveToDoubleHi(Register src, FloatRegister dest) { as_mthc1(src, dest); }
  void moveFromDoubleHi(FloatRegister src, Register dest) {
    as_mfhc1(dest, src);
  }

  void moveToDouble(Register src, FloatRegister dest) { as_dmtc1(src, dest); }
  void moveFromDouble(FloatRegister src, Register dest) { as_dmfc1(dest, src); }
};

class MacroAssembler;

class MacroAssemblerMIPS64Compat : public MacroAssemblerMIPS64 {
 public:
  using MacroAssemblerMIPS64::call;

  MacroAssemblerMIPS64Compat() {}

  void convertBoolToInt32(Register source, Register dest);
  void convertInt32ToDouble(Register src, FloatRegister dest);
  void convertInt32ToDouble(const Address& src, FloatRegister dest);
  void convertInt32ToDouble(const BaseIndex& src, FloatRegister dest);
  void convertUInt32ToDouble(Register src, FloatRegister dest);
  void convertUInt32ToFloat32(Register src, FloatRegister dest);
  void convertDoubleToFloat32(FloatRegister src, FloatRegister dest);
  void convertDoubleToInt32(FloatRegister src, Register dest, Label* fail,
                            bool negativeZeroCheck = true);
  void convertFloat32ToInt32(FloatRegister src, Register dest, Label* fail,
                             bool negativeZeroCheck = true);

  void convertFloat32ToDouble(FloatRegister src, FloatRegister dest);
  void convertInt32ToFloat32(Register src, FloatRegister dest);
  void convertInt32ToFloat32(const Address& src, FloatRegister dest);

  void movq(Register rs, Register rd);

  void computeScaledAddress(const BaseIndex& address, Register dest);

  void computeEffectiveAddress(const Address& address, Register dest) {
    ma_daddu(dest, address.base, Imm32(address.offset));
  }

  inline void computeEffectiveAddress(const BaseIndex& address, Register dest);

  void j(Label* dest) { ma_b(dest); }

  void mov(Register src, Register dest) { as_ori(dest, src, 0); }
  void mov(ImmWord imm, Register dest) { ma_li(dest, imm); }
  void mov(ImmPtr imm, Register dest) {
    mov(ImmWord(uintptr_t(imm.value)), dest);
  }
  void mov(CodeLabel* label, Register dest) { ma_li(dest, label); }
  void mov(Register src, Address dest) { MOZ_CRASH("NYI-IC"); }
  void mov(Address src, Register dest) { MOZ_CRASH("NYI-IC"); }

  void writeDataRelocation(const Value& val) {
    if (val.isGCThing()) {
      gc::Cell* cell = val.toGCThing();
      if (cell && gc::IsInsideNursery(cell)) {
        embedsNurseryPointers_ = true;
      }
      dataRelocations_.writeUnsigned(currentOffset());
    }
  }

  void branch(JitCode* c) {
    BufferOffset bo = m_buffer.nextOffset();
    addPendingJump(bo, ImmPtr(c->raw()), RelocationKind::JITCODE);
    ma_liPatchable(ScratchRegister, ImmPtr(c->raw()));
    as_jr(ScratchRegister);
    as_nop();
  }
  void branch(const Register reg) {
    as_jr(reg);
    as_nop();
  }
  void nop() { as_nop(); }
  void ret() {
    ma_pop(ra);
    as_jr(ra);
    as_nop();
  }
  inline void retn(Imm32 n);
  void push(Imm32 imm) {
    ma_li(ScratchRegister, imm);
    ma_push(ScratchRegister);
  }
  void push(ImmWord imm) {
    ma_li(ScratchRegister, imm);
    ma_push(ScratchRegister);
  }
  void push(ImmGCPtr imm) {
    ma_li(ScratchRegister, imm);
    ma_push(ScratchRegister);
  }
  void push(const Address& address) {
    loadPtr(address, ScratchRegister);
    ma_push(ScratchRegister);
  }
  void push(Register reg) { ma_push(reg); }
  void push(FloatRegister reg) { ma_push(reg); }
  void pop(Register reg) { ma_pop(reg); }
  void pop(FloatRegister reg) { ma_pop(reg); }

  // Emit a branch that can be toggled to a non-operation. On MIPS64 we use
  // "andi" instruction to toggle the branch.
  // See ToggleToJmp(), ToggleToCmp().
  CodeOffset toggledJump(Label* label);

  // Emit a "jalr" or "nop" instruction. ToggleCall can be used to patch
  // this instruction.
  CodeOffset toggledCall(JitCode* target, bool enabled);

  static size_t ToggledCallSize(uint8_t* code) {
    // Six instructions used in: MacroAssemblerMIPS64Compat::toggledCall
    return 6 * sizeof(uint32_t);
  }

  CodeOffset pushWithPatch(ImmWord imm) {
    CodeOffset offset = movWithPatch(imm, ScratchRegister);
    ma_push(ScratchRegister);
    return offset;
  }

  CodeOffset movWithPatch(ImmWord imm, Register dest) {
    CodeOffset offset = CodeOffset(currentOffset());
    ma_liPatchable(dest, imm, Li64);
    return offset;
  }
  CodeOffset movWithPatch(ImmPtr imm, Register dest) {
    CodeOffset offset = CodeOffset(currentOffset());
    ma_liPatchable(dest, imm);
    return offset;
  }

  void writeCodePointer(CodeLabel* label) {
    label->patchAt()->bind(currentOffset());
    label->setLinkMode(CodeLabel::RawPointer);
    m_buffer.ensureSpace(sizeof(void*));
    writeInst(-1);
    writeInst(-1);
  }

  void jump(Label* label) { ma_b(label); }
  void jump(Register reg) {
    as_jr(reg);
    as_nop();
  }
  void jump(const Address& address) {
    loadPtr(address, ScratchRegister);
    as_jr(ScratchRegister);
    as_nop();
  }

  void jump(JitCode* code) { branch(code); }

  void jump(TrampolinePtr code) {
    auto target = ImmPtr(code.value);
    BufferOffset bo = m_buffer.nextOffset();
    addPendingJump(bo, target, RelocationKind::HARDCODED);
    ma_jump(target);
  }

  void splitTag(Register src, Register dest) {
    ma_dsrl(dest, src, Imm32(JSVAL_TAG_SHIFT));
  }

  void splitTag(const ValueOperand& operand, Register dest) {
    splitTag(operand.valueReg(), dest);
  }

  void splitTagForTest(const ValueOperand& value, ScratchTagScope& tag) {
    splitTag(value, tag);
  }

  // unboxing code
  void unboxNonDouble(const ValueOperand& operand, Register dest,
                      JSValueType type) {
    unboxNonDouble(operand.valueReg(), dest, type);
  }

  template <typename T>
  void unboxNonDouble(T src, Register dest, JSValueType type) {
    MOZ_ASSERT(type != JSVAL_TYPE_DOUBLE);
    if (type == JSVAL_TYPE_INT32 || type == JSVAL_TYPE_BOOLEAN) {
      load32(src, dest);
      return;
    }
    loadPtr(src, dest);
    unboxNonDouble(dest, dest, type);
  }

  void unboxNonDouble(Register src, Register dest, JSValueType type) {
    MOZ_ASSERT(type != JSVAL_TYPE_DOUBLE);
    if (type == JSVAL_TYPE_INT32 || type == JSVAL_TYPE_BOOLEAN) {
      ma_sll(dest, src, Imm32(0));
      return;
    }
    MOZ_ASSERT(ScratchRegister != src);
    mov(ImmWord(JSVAL_TYPE_TO_SHIFTED_TAG(type)), ScratchRegister);
    as_xor(dest, src, ScratchRegister);
  }

  template <typename T>
  void unboxObjectOrNull(const T& src, Register dest) {
    unboxNonDouble(src, dest, JSVAL_TYPE_OBJECT);
    JS_STATIC_ASSERT(JSVAL_OBJECT_OR_NULL_BIT ==
                     (uint64_t(0x8) << JSVAL_TAG_SHIFT));
    ma_dins(dest, zero, Imm32(JSVAL_TAG_SHIFT + 3), Imm32(1));
  }

  void unboxGCThingForPreBarrierTrampoline(const Address& src, Register dest) {
    loadPtr(src, dest);
    ma_dext(dest, dest, Imm32(0), Imm32(JSVAL_TAG_SHIFT));
  }

  void unboxInt32(const ValueOperand& operand, Register dest);
  void unboxInt32(Register src, Register dest);
  void unboxInt32(const Address& src, Register dest);
  void unboxInt32(const BaseIndex& src, Register dest);
  void unboxBoolean(const ValueOperand& operand, Register dest);
  void unboxBoolean(Register src, Register dest);
  void unboxBoolean(const Address& src, Register dest);
  void unboxBoolean(const BaseIndex& src, Register dest);
  void unboxDouble(const ValueOperand& operand, FloatRegister dest);
  void unboxDouble(Register src, Register dest);
  void unboxDouble(const Address& src, FloatRegister dest);
  void unboxString(const ValueOperand& operand, Register dest);
  void unboxString(Register src, Register dest);
  void unboxString(const Address& src, Register dest);
  void unboxSymbol(const ValueOperand& src, Register dest);
  void unboxSymbol(Register src, Register dest);
  void unboxSymbol(const Address& src, Register dest);
  void unboxBigInt(const ValueOperand& operand, Register dest);
  void unboxBigInt(Register src, Register dest);
  void unboxBigInt(const Address& src, Register dest);
  void unboxObject(const ValueOperand& src, Register dest);
  void unboxObject(Register src, Register dest);
  void unboxObject(const Address& src, Register dest);
  void unboxObject(const BaseIndex& src, Register dest) {
    unboxNonDouble(src, dest, JSVAL_TYPE_OBJECT);
  }
  void unboxValue(const ValueOperand& src, AnyRegister dest, JSValueType type);
  void unboxPrivate(const ValueOperand& src, Register dest);

  void notBoolean(const ValueOperand& val) {
    as_xori(val.valueReg(), val.valueReg(), 1);
  }

  // boxing code
  void boxDouble(FloatRegister src, const ValueOperand& dest, FloatRegister);
  void boxNonDouble(JSValueType type, Register src, const ValueOperand& 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.
  MOZ_MUST_USE Register extractObject(const Address& address, Register scratch);
  MOZ_MUST_USE Register extractObject(const ValueOperand& value,
                                      Register scratch) {
    unboxObject(value, scratch);
    return scratch;
  }
  MOZ_MUST_USE Register extractString(const ValueOperand& value,
                                      Register scratch) {
    unboxString(value, scratch);
    return scratch;
  }
  MOZ_MUST_USE Register extractSymbol(const ValueOperand& value,
                                      Register scratch) {
    unboxSymbol(value, scratch);
    return scratch;
  }
  MOZ_MUST_USE Register extractInt32(const ValueOperand& value,
                                     Register scratch) {
    unboxInt32(value, scratch);
    return scratch;
  }
  MOZ_MUST_USE Register extractBoolean(const ValueOperand& value,
                                       Register scratch) {
    unboxBoolean(value, scratch);
    return scratch;
  }
  MOZ_MUST_USE Register extractTag(const Address& address, Register scratch);
  MOZ_MUST_USE Register extractTag(const BaseIndex& address, Register scratch);
  MOZ_MUST_USE Register extractTag(const ValueOperand& value,
                                   Register scratch) {
    MOZ_ASSERT(scratch != ScratchRegister);
    splitTag(value, scratch);
    return scratch;
  }

  void boolValueToDouble(const ValueOperand& operand, FloatRegister dest);
  void int32ValueToDouble(const ValueOperand& operand, FloatRegister dest);
  void loadInt32OrDouble(const Address& src, FloatRegister dest);
  void loadInt32OrDouble(const BaseIndex& addr, FloatRegister dest);
  void loadConstantDouble(double dp, FloatRegister dest);

  void boolValueToFloat32(const ValueOperand& operand, FloatRegister dest);
  void int32ValueToFloat32(const ValueOperand& operand, FloatRegister dest);
  void loadConstantFloat32(float f, FloatRegister dest);

  void testNullSet(Condition cond, const ValueOperand& value, Register dest);

  void testObjectSet(Condition cond, const ValueOperand& value, Register dest);

  void testUndefinedSet(Condition cond, const ValueOperand& value,
                        Register dest);

  // higher level tag testing code
  Address ToPayload(Address value) { return value; }

  CodeOffsetJump jumpWithPatch(RepatchLabel* label);

  template <typename T>
  void loadUnboxedValue(const T& address, MIRType type, AnyRegister dest) {
    if (dest.isFloat()) {
      loadInt32OrDouble(address, dest.fpu());
    } else if (type == MIRType::ObjectOrNull) {
      unboxObjectOrNull(address, dest.gpr());
    } else {
      unboxNonDouble(address, dest.gpr(), ValueTypeFromMIRType(type));
    }
  }

  void storeUnboxedPayload(ValueOperand value, BaseIndex address, size_t nbytes,
                           JSValueType type) {
    switch (nbytes) {
      case 8:
        if (type == JSVAL_TYPE_OBJECT) {
          unboxObjectOrNull(value, SecondScratchReg);
        } else {
          unboxNonDouble(value, SecondScratchReg, type);
        }
        computeEffectiveAddress(address, ScratchRegister);
        as_sd(SecondScratchReg, ScratchRegister, 0);
        return;
      case 4:
        store32(value.valueReg(), address);
        return;
      case 1:
        store8(value.valueReg(), address);
        return;
      default:
        MOZ_CRASH("Bad payload width");
    }
  }

  void storeUnboxedPayload(ValueOperand value, Address address, size_t nbytes,
                           JSValueType type) {
    switch (nbytes) {
      case 8:
        if (type == JSVAL_TYPE_OBJECT) {
          unboxObjectOrNull(value, SecondScratchReg);
        } else {
          unboxNonDouble(value, SecondScratchReg, type);
        }
        storePtr(SecondScratchReg, address);
        return;
      case 4:
        store32(value.valueReg(), address);
        return;
      case 1:
        store8(value.valueReg(), address);
        return;
      default:
        MOZ_CRASH("Bad payload width");
    }
  }

  void boxValue(JSValueType type, Register src, Register dest) {
    MOZ_ASSERT(src != dest);

    JSValueTag tag = (JSValueTag)JSVAL_TYPE_TO_TAG(type);
    ma_li(dest, Imm32(tag));
    ma_dsll(dest, dest, Imm32(JSVAL_TAG_SHIFT));
    ma_dins(dest, src, Imm32(0), Imm32(JSVAL_TAG_SHIFT));
  }

  void storeValue(ValueOperand val, Operand dst);
  void storeValue(ValueOperand val, const BaseIndex& dest);
  void storeValue(JSValueType type, Register reg, BaseIndex dest);
  void storeValue(ValueOperand val, const Address& dest);
  void storeValue(JSValueType type, Register reg, Address dest);
  void storeValue(const Value& val, Address dest);
  void storeValue(const Value& val, BaseIndex dest);
  void storeValue(const Address& src, const Address& dest, Register temp) {
    loadPtr(src, temp);
    storePtr(temp, dest);
  }

  void loadValue(Address src, ValueOperand val);
  void loadValue(Operand dest, ValueOperand val) {
    loadValue(dest.toAddress(), val);
  }
  void loadValue(const BaseIndex& addr, ValueOperand val);

  void loadUnalignedValue(const Address& src, ValueOperand dest) {
    loadValue(src, dest);
  }

  void tagValue(JSValueType type, Register payload, ValueOperand dest);

  void pushValue(ValueOperand val);
  void popValue(ValueOperand val);
  void pushValue(const Value& val) {
    if (val.isGCThing()) {
      writeDataRelocation(val);
      movWithPatch(ImmWord(val.asRawBits()), ScratchRegister);
      push(ScratchRegister);
    } else {
      push(ImmWord(val.asRawBits()));
    }
  }
  void pushValue(JSValueType type, Register reg) {
    boxValue(type, reg, ScratchRegister);
    push(ScratchRegister);
  }
  void pushValue(const Address& addr);

  void handleFailureWithHandlerTail(void* handler, Label* profilerExitTail);

  /////////////////////////////////////////////////////////////////
  // Common interface.
  /////////////////////////////////////////////////////////////////
 public:
  // The following functions are exposed for use in platform-shared code.

  inline void incrementInt32Value(const Address& addr);

  void move32(Imm32 imm, Register dest);
  void move32(Register src, Register dest);

  void movePtr(Register src, Register dest);
  void movePtr(ImmWord imm, Register dest);
  void movePtr(ImmPtr imm, Register dest);
  void movePtr(wasm::SymbolicAddress imm, Register dest);
  void movePtr(ImmGCPtr imm, Register dest);

  void load8SignExtend(const Address& address, Register dest);
  void load8SignExtend(const BaseIndex& src, Register dest);

  void load8ZeroExtend(const Address& address, Register dest);
  void load8ZeroExtend(const BaseIndex& src, Register dest);

  void load16SignExtend(const Address& address, Register dest);
  void load16SignExtend(const BaseIndex& src, Register dest);

  void load16ZeroExtend(const Address& address, Register dest);
  void load16ZeroExtend(const BaseIndex& src, Register dest);

  void load32(const Address& address, Register dest);
  void load32(const BaseIndex& address, Register dest);
  void load32(AbsoluteAddress address, Register dest);
  void load32(wasm::SymbolicAddress address, Register dest);
  void load64(const Address& address, Register64 dest) {
    loadPtr(address, dest.reg);
  }

  void loadPtr(const Address& address, Register dest);
  void loadPtr(const BaseIndex& src, Register dest);
  void loadPtr(AbsoluteAddress address, Register dest);
  void loadPtr(wasm::SymbolicAddress address, Register dest);

  void loadPrivate(const Address& address, Register dest);

  void loadUnalignedDouble(const wasm::MemoryAccessDesc& access,
                           const BaseIndex& src, Register temp,
                           FloatRegister dest);
  void loadUnalignedFloat32(const wasm::MemoryAccessDesc& access,
                            const BaseIndex& src, Register temp,
                            FloatRegister dest);

  void store8(Register src, const Address& address);
  void store8(Imm32 imm, const Address& address);
  void store8(Register src, const BaseIndex& address);
  void store8(Imm32 imm, const BaseIndex& address);

  void store16(Register src, const Address& address);
  void store16(Imm32 imm, const Address& address);
  void store16(Register src, const BaseIndex& address);
  void store16(Imm32 imm, const BaseIndex& address);

  void store32(Register src, AbsoluteAddress address);
  void store32(Register src, const Address& address);
  void store32(Register src, const BaseIndex& address);
  void store32(Imm32 src, const Address& address);
  void store32(Imm32 src, const BaseIndex& address);

  // NOTE: This will use second scratch on MIPS64. Only ARM needs the
  // implementation without second scratch.
  void store32_NoSecondScratch(Imm32 src, const Address& address) {
    store32(src, address);
  }

  void store64(Imm64 imm, Address address) {
    storePtr(ImmWord(imm.value), address);
  }

  void store64(Register64 src, Address address) { storePtr(src.reg, address); }

  template <typename T>
  void storePtr(ImmWord imm, T address);
  template <typename T>
  void storePtr(ImmPtr imm, T address);
  template <typename T>
  void storePtr(ImmGCPtr imm, T address);
  void storePtr(Register src, const Address& address);
  void storePtr(Register src, const BaseIndex& address);
  void storePtr(Register src, AbsoluteAddress dest);

  void storeUnalignedFloat32(const wasm::MemoryAccessDesc& access,
                             FloatRegister src, Register temp,
                             const BaseIndex& dest);
  void storeUnalignedDouble(const wasm::MemoryAccessDesc& access,
                            FloatRegister src, Register temp,
                            const BaseIndex& dest);

  void moveDouble(FloatRegister src, FloatRegister dest) { as_movd(dest, src); }

  void zeroDouble(FloatRegister reg) { moveToDouble(zero, reg); }

  void convertUInt64ToDouble(Register src, FloatRegister dest);

  void breakpoint();

  void checkStackAlignment();

  static void calculateAlignedStackPointer(void** stackPointer);

  // 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);

  void cmpPtrSet(Assembler::Condition cond, Address lhs, ImmPtr rhs,
                 Register dest);
  void cmpPtrSet(Assembler::Condition cond, Register lhs, Address rhs,
                 Register dest);

  void cmp32Set(Assembler::Condition cond, Register lhs, Address rhs,
                Register dest);

  void cmp64Set(Assembler::Condition cond, Register lhs, Imm32 rhs,
                Register dest) {
    ma_cmp_set(dest, lhs, rhs, cond);
  }

 protected:
  bool buildOOLFakeExitFrame(void* fakeReturnAddr);

  void wasmLoadI64Impl(const wasm::MemoryAccessDesc& access,
                       Register memoryBase, Register ptr, Register ptrScratch,
                       Register64 output, Register tmp);
  void wasmStoreI64Impl(const wasm::MemoryAccessDesc& access, Register64 value,
                        Register memoryBase, Register ptr, Register ptrScratch,
                        Register tmp);

 public:
  CodeOffset labelForPatch() { return CodeOffset(nextOffset().getOffset()); }

  void lea(Operand addr, Register dest) {
    ma_daddu(dest, addr.baseReg(), Imm32(addr.disp()));
  }

  void abiret() {
    as_jr(ra);
    as_nop();
  }

  void moveFloat32(FloatRegister src, FloatRegister dest) {
    as_movs(dest, src);
  }

  void loadWasmGlobalPtr(uint32_t globalDataOffset, Register dest) {
    loadPtr(Address(WasmTlsReg,
                    offsetof(wasm::TlsData, globalArea) + globalDataOffset),
            dest);
  }
  void loadWasmPinnedRegsFromTls() {
    loadPtr(Address(WasmTlsReg, offsetof(wasm::TlsData, memoryBase)), HeapReg);
  }

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

typedef MacroAssemblerMIPS64Compat MacroAssemblerSpecific;

}  // namespace jit
}  // namespace js

#endif /* jit_mips64_MacroAssembler_mips64_h */