src/third_party/mozjs-45/js/src/jit/arm64/LIR-arm64.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_arm64_LIR_arm64_h
#define jit_arm64_LIR_arm64_h

namespace js {
namespace jit {

class LUnboxBase : public LInstructionHelper<1, 1, 0>
{
  public:
    LUnboxBase(const LAllocation& input) {
        setOperand(0, input);
    }

    static const size_t Input = 0;

    MUnbox* mir() const {
        return mir_->toUnbox();
    }
};

class LUnbox : public LUnboxBase
{
  public:
    LIR_HEADER(Unbox);

    LUnbox(const LAllocation& input)
      : LUnboxBase(input)
    { }

    const char* extraName() const {
        return StringFromMIRType(mir()->type());
    }
};

class LUnboxFloatingPoint : public LUnboxBase
{
    MIRType type_;

  public:
    LIR_HEADER(UnboxFloatingPoint);

    LUnboxFloatingPoint(const LAllocation& input, MIRType type)
      : LUnboxBase(input),
        type_(type)
    { }

    MIRType type() const {
        return type_;
    }
    const char* extraName() const {
        return StringFromMIRType(type_);
    }
};

// Convert a 32-bit unsigned integer to a double.
class LAsmJSUInt32ToDouble : public LInstructionHelper<1, 1, 0>
{
  public:
    LIR_HEADER(AsmJSUInt32ToDouble)

    LAsmJSUInt32ToDouble(const LAllocation& input) {
        setOperand(0, input);
    }
};

// Convert a 32-bit unsigned integer to a float32.
class LAsmJSUInt32ToFloat32 : public LInstructionHelper<1, 1, 0>
{
  public:
    LIR_HEADER(AsmJSUInt32ToFloat32)

    LAsmJSUInt32ToFloat32(const LAllocation& input) {
        setOperand(0, input);
    }
};

class LDivI : public LBinaryMath<1>
{
  public:
    LIR_HEADER(DivI);

    LDivI(const LAllocation& lhs, const LAllocation& rhs,
          const LDefinition& temp)
    {
        setOperand(0, lhs);
        setOperand(1, rhs);
        setTemp(0, temp);
    }

    MDiv* mir() const {
        return mir_->toDiv();
    }
};

// LSoftDivI is a software divide for ARM cores that don't support a hardware
// divide instruction.
//
// It is implemented as a proper C function so it trashes r0, r1, r2 and r3.
// The call also trashes lr, and has the ability to trash ip. The function also
// takes two arguments (dividend in r0, divisor in r1). The LInstruction gets
// encoded such that the divisor and dividend are passed in their apropriate
// registers and end their life at the start of the instruction by the use of
// useFixedAtStart.  The result is returned in r0 and the other three registers
// that can be trashed are marked as temps.  For the time being, the link
// register is not marked as trashed because we never allocate to the link
// register.  The FP registers are not trashed.
class LSoftDivI : public LBinaryMath<3>
{
  public:
    LIR_HEADER(SoftDivI);

    LSoftDivI(const LAllocation& lhs, const LAllocation& rhs,
              const LDefinition& temp1, const LDefinition& temp2, const LDefinition& temp3) {
        setOperand(0, lhs);
        setOperand(1, rhs);
        setTemp(0, temp1);
        setTemp(1, temp2);
        setTemp(2, temp3);
    }

    MDiv* mir() const {
        return mir_->toDiv();
    }
};

class LDivPowTwoI : public LInstructionHelper<1, 1, 0>
{
    const int32_t shift_;

  public:
    LIR_HEADER(DivPowTwoI)

    LDivPowTwoI(const LAllocation& lhs, int32_t shift)
      : shift_(shift)
    {
        setOperand(0, lhs);
    }

    const LAllocation* numerator() {
        return getOperand(0);
    }

    int32_t shift() {
        return shift_;
    }

    MDiv* mir() const {
        return mir_->toDiv();
    }
};

class LModI : public LBinaryMath<1>
{
  public:
    LIR_HEADER(ModI);

    LModI(const LAllocation& lhs, const LAllocation& rhs,
          const LDefinition& callTemp)
    {
        setOperand(0, lhs);
        setOperand(1, rhs);
        setTemp(0, callTemp);
    }

    const LDefinition* callTemp() {
        return getTemp(0);
    }

    MMod* mir() const {
        return mir_->toMod();
    }
};

class LSoftModI : public LBinaryMath<4>
{
  public:
    LIR_HEADER(SoftModI);

    LSoftModI(const LAllocation& lhs, const LAllocation& rhs,
              const LDefinition& temp1, const LDefinition& temp2, const LDefinition& temp3,
              const LDefinition& callTemp)
    {
        setOperand(0, lhs);
        setOperand(1, rhs);
        setTemp(0, temp1);
        setTemp(1, temp2);
        setTemp(2, temp3);
        setTemp(3, callTemp);
    }

    const LDefinition* callTemp() {
        return getTemp(3);
    }

    MMod* mir() const {
        return mir_->toMod();
    }
};

class LModPowTwoI : public LInstructionHelper<1, 1, 0>
{
    const int32_t shift_;

  public:
    LIR_HEADER(ModPowTwoI);
    int32_t shift()
    {
        return shift_;
    }

    LModPowTwoI(const LAllocation& lhs, int32_t shift)
      : shift_(shift)
    {
        setOperand(0, lhs);
    }

    MMod* mir() const {
        return mir_->toMod();
    }
};

class LModMaskI : public LInstructionHelper<1, 1, 1>
{
    const int32_t shift_;

  public:
    LIR_HEADER(ModMaskI);

    LModMaskI(const LAllocation& lhs, const LDefinition& temp1, int32_t shift)
      : shift_(shift)
    {
        setOperand(0, lhs);
        setTemp(0, temp1);
    }

    int32_t shift() const {
        return shift_;
    }

    MMod* mir() const {
        return mir_->toMod();
    }
};

// Takes a tableswitch with an integer to decide
class LTableSwitch : public LInstructionHelper<0, 1, 1>
{
  public:
    LIR_HEADER(TableSwitch);

    LTableSwitch(const LAllocation& in, const LDefinition& inputCopy, MTableSwitch* ins) {
        setOperand(0, in);
        setTemp(0, inputCopy);
        setMir(ins);
    }

    MTableSwitch* mir() const {
        return mir_->toTableSwitch();
    }

    const LAllocation* index() {
        return getOperand(0);
    }
    const LDefinition* tempInt() {
        return getTemp(0);
    }
    // This is added to share the same CodeGenerator prefixes.
    const LDefinition* tempPointer() {
        return nullptr;
    }
};

// Takes a tableswitch with an integer to decide
class LTableSwitchV : public LInstructionHelper<0, BOX_PIECES, 2>
{
  public:
    LIR_HEADER(TableSwitchV);

    LTableSwitchV(const LDefinition& inputCopy, const LDefinition& floatCopy,
                  MTableSwitch* ins)
    {
        setTemp(0, inputCopy);
        setTemp(1, floatCopy);
        setMir(ins);
    }

    MTableSwitch* mir() const {
        return mir_->toTableSwitch();
    }

    static const size_t InputValue = 0;

    const LDefinition* tempInt() {
        return getTemp(0);
    }
    const LDefinition* tempFloat() {
        return getTemp(1);
    }
    const LDefinition* tempPointer() {
        return nullptr;
    }
};

class LGuardShape : public LInstructionHelper<0, 1, 1>
{
  public:
    LIR_HEADER(GuardShape);

    LGuardShape(const LAllocation& in, const LDefinition& temp) {
        setOperand(0, in);
        setTemp(0, temp);
    }
    const MGuardShape* mir() const {
        return mir_->toGuardShape();
    }
    const LDefinition* tempInt() {
        return getTemp(0);
    }
};

class LGuardObjectGroup : public LInstructionHelper<0, 1, 1>
{
  public:
    LIR_HEADER(GuardObjectGroup);

    LGuardObjectGroup(const LAllocation& in, const LDefinition& temp) {
        setOperand(0, in);
        setTemp(0, temp);
    }
    const MGuardObjectGroup* mir() const {
        return mir_->toGuardObjectGroup();
    }
    const LDefinition* tempInt() {
        return getTemp(0);
    }
};

class LMulI : public LBinaryMath<0>
{
  public:
    LIR_HEADER(MulI);

    MMul* mir() {
        return mir_->toMul();
    }
};

class LUDiv : public LBinaryMath<0>
{
  public:
    LIR_HEADER(UDiv);

    MDiv* mir() {
        return mir_->toDiv();
    }
};

class LUMod : public LBinaryMath<0>
{
  public:
    LIR_HEADER(UMod);

    MMod* mir() {
        return mir_->toMod();
    }
};

// This class performs a simple x86 'div', yielding either a quotient or remainder depending on
// whether this instruction is defined to output eax (quotient) or edx (remainder).
class LSoftUDivOrMod : public LBinaryMath<3>
{
  public:
    LIR_HEADER(SoftUDivOrMod);

    LSoftUDivOrMod(const LAllocation& lhs, const LAllocation& rhs, const LDefinition& temp1,
                   const LDefinition& temp2, const LDefinition& temp3) {
        setOperand(0, lhs);
        setOperand(1, rhs);
        setTemp(0, temp1);
        setTemp(1, temp2);
        setTemp(2, temp3);
    }
};

class LAsmJSLoadFuncPtr : public LInstructionHelper<1, 1, 1>
{
  public:
    LIR_HEADER(AsmJSLoadFuncPtr);
    LAsmJSLoadFuncPtr(const LAllocation& index, const LDefinition& temp) {
        setOperand(0, index);
        setTemp(0, temp);
    }
    const MAsmJSLoadFuncPtr* mir() const {
        return mir_->toAsmJSLoadFuncPtr();
    }
    const LAllocation* index() {
        return getOperand(0);
    }
    const LDefinition* temp() {
        return getTemp(0);
    }
};

} // namespace jit
} // namespace js

#endif /* jit_arm64_LIR_arm64_h */