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/* -*- 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
#ifndef jit_arm64_MoveEmitter_arm64_h
#define jit_arm64_MoveEmitter_arm64_h
#include "mozilla/Assertions.h"
#include <stdint.h>
#include "jit/arm64/Assembler-arm64.h"
#include "jit/MacroAssembler.h"
#include "jit/MoveResolver.h"
#include "jit/Registers.h"
namespace js {
namespace jit {
class CodeGenerator;
class MoveEmitterARM64 {
bool inCycle_;
MacroAssembler& masm;
// A scratch general register used to break cycles.
ARMRegister cycleGeneralReg_;
// Original stack push value.
uint32_t pushedAtStart_;
// This stores a stack offset to a spill location, snapshotting
// codegen->framePushed_ at the time it was allocated. It is -1 if no
// stack space has been allocated for that particular spill.
int32_t pushedAtCycle_;
void assertDone() { MOZ_ASSERT(!inCycle_); }
MemOperand cycleSlot();
MemOperand toMemOperand(const MoveOperand& operand) const;
ARMRegister toARMReg32(const MoveOperand& operand) const {
MOZ_ASSERT(operand.isGeneralReg());
return ARMRegister(operand.reg(), 32);
}
ARMRegister toARMReg64(const MoveOperand& operand) const {
if (operand.isGeneralReg()) {
return ARMRegister(operand.reg(), 64);
} else {
return ARMRegister(operand.base(), 64);
}
}
ARMFPRegister toFPReg(const MoveOperand& operand, MoveOp::Type t) const {
MOZ_ASSERT(operand.isFloatReg());
switch (t) {
case MoveOp::FLOAT32:
return ARMFPRegister(operand.floatReg().encoding(), 32);
case MoveOp::DOUBLE:
return ARMFPRegister(operand.floatReg().encoding(), 64);
case MoveOp::SIMD128:
return ARMFPRegister(operand.floatReg().encoding(), 128);
default:
MOZ_MAKE_COMPILER_ASSUME_IS_UNREACHABLE("Bad register type");
}
}
void emitFloat32Move(const MoveOperand& from, const MoveOperand& to);
void emitDoubleMove(const MoveOperand& from, const MoveOperand& to);
void emitSimd128Move(const MoveOperand& from, const MoveOperand& to);
void emitInt32Move(const MoveOperand& from, const MoveOperand& to);
void emitGeneralMove(const MoveOperand& from, const MoveOperand& to);
void emitMove(const MoveOp& move);
void breakCycle(const MoveOperand& from, const MoveOperand& to,
MoveOp::Type type);
void completeCycle(const MoveOperand& from, const MoveOperand& to,
MoveOp::Type type);
public:
explicit MoveEmitterARM64(MacroAssembler& masm)
: inCycle_(false),
masm(masm),
pushedAtStart_(masm.framePushed()),
pushedAtCycle_(-1) {}
~MoveEmitterARM64() { assertDone(); }
void emit(const MoveResolver& moves);
void finish();
void setScratchRegister(Register reg) {}
};
using MoveEmitter = MoveEmitterARM64;
} // namespace jit
} // namespace js
#endif /* jit_arm64_MoveEmitter_arm64_h */