/
code-generator-ia32.cc
5068 lines (4902 loc) · 182 KB
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code-generator-ia32.cc
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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/base/overflowing-math.h"
#include "src/codegen/assembler-inl.h"
#include "src/codegen/callable.h"
#include "src/codegen/ia32/assembler-ia32.h"
#include "src/codegen/macro-assembler.h"
#include "src/codegen/optimized-compilation-info.h"
#include "src/compiler/backend/code-generator-impl.h"
#include "src/compiler/backend/code-generator.h"
#include "src/compiler/backend/gap-resolver.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/osr.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames.h"
#include "src/heap/memory-chunk.h"
#include "src/objects/smi.h"
#include "src/wasm/wasm-code-manager.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
namespace compiler {
#define __ tasm()->
#define kScratchDoubleReg xmm0
// Adds IA-32 specific methods for decoding operands.
class IA32OperandConverter : public InstructionOperandConverter {
public:
IA32OperandConverter(CodeGenerator* gen, Instruction* instr)
: InstructionOperandConverter(gen, instr) {}
Operand InputOperand(size_t index, int extra = 0) {
return ToOperand(instr_->InputAt(index), extra);
}
Immediate InputImmediate(size_t index) {
return ToImmediate(instr_->InputAt(index));
}
Operand OutputOperand() { return ToOperand(instr_->Output()); }
Operand ToOperand(InstructionOperand* op, int extra = 0) {
if (op->IsRegister()) {
DCHECK_EQ(0, extra);
return Operand(ToRegister(op));
} else if (op->IsFPRegister()) {
DCHECK_EQ(0, extra);
return Operand(ToDoubleRegister(op));
}
DCHECK(op->IsStackSlot() || op->IsFPStackSlot());
return SlotToOperand(AllocatedOperand::cast(op)->index(), extra);
}
Operand SlotToOperand(int slot, int extra = 0) {
FrameOffset offset = frame_access_state()->GetFrameOffset(slot);
return Operand(offset.from_stack_pointer() ? esp : ebp,
offset.offset() + extra);
}
Immediate ToImmediate(InstructionOperand* operand) {
Constant constant = ToConstant(operand);
if (constant.type() == Constant::kInt32 &&
RelocInfo::IsWasmReference(constant.rmode())) {
return Immediate(static_cast<Address>(constant.ToInt32()),
constant.rmode());
}
switch (constant.type()) {
case Constant::kInt32:
return Immediate(constant.ToInt32());
case Constant::kFloat32:
return Immediate::EmbeddedNumber(constant.ToFloat32());
case Constant::kFloat64:
return Immediate::EmbeddedNumber(constant.ToFloat64().value());
case Constant::kExternalReference:
return Immediate(constant.ToExternalReference());
case Constant::kHeapObject:
return Immediate(constant.ToHeapObject());
case Constant::kCompressedHeapObject:
break;
case Constant::kDelayedStringConstant:
return Immediate::EmbeddedStringConstant(
constant.ToDelayedStringConstant());
case Constant::kInt64:
break;
case Constant::kRpoNumber:
return Immediate::CodeRelativeOffset(ToLabel(operand));
}
UNREACHABLE();
}
static size_t NextOffset(size_t* offset) {
size_t i = *offset;
(*offset)++;
return i;
}
static ScaleFactor ScaleFor(AddressingMode one, AddressingMode mode) {
STATIC_ASSERT(0 == static_cast<int>(times_1));
STATIC_ASSERT(1 == static_cast<int>(times_2));
STATIC_ASSERT(2 == static_cast<int>(times_4));
STATIC_ASSERT(3 == static_cast<int>(times_8));
int scale = static_cast<int>(mode - one);
DCHECK(scale >= 0 && scale < 4);
return static_cast<ScaleFactor>(scale);
}
Operand MemoryOperand(size_t* offset) {
AddressingMode mode = AddressingModeField::decode(instr_->opcode());
switch (mode) {
case kMode_MR: {
Register base = InputRegister(NextOffset(offset));
int32_t disp = 0;
return Operand(base, disp);
}
case kMode_MRI: {
Register base = InputRegister(NextOffset(offset));
Constant ctant = ToConstant(instr_->InputAt(NextOffset(offset)));
return Operand(base, ctant.ToInt32(), ctant.rmode());
}
case kMode_MR1:
case kMode_MR2:
case kMode_MR4:
case kMode_MR8: {
Register base = InputRegister(NextOffset(offset));
Register index = InputRegister(NextOffset(offset));
ScaleFactor scale = ScaleFor(kMode_MR1, mode);
int32_t disp = 0;
return Operand(base, index, scale, disp);
}
case kMode_MR1I:
case kMode_MR2I:
case kMode_MR4I:
case kMode_MR8I: {
Register base = InputRegister(NextOffset(offset));
Register index = InputRegister(NextOffset(offset));
ScaleFactor scale = ScaleFor(kMode_MR1I, mode);
Constant ctant = ToConstant(instr_->InputAt(NextOffset(offset)));
return Operand(base, index, scale, ctant.ToInt32(), ctant.rmode());
}
case kMode_M1:
case kMode_M2:
case kMode_M4:
case kMode_M8: {
Register index = InputRegister(NextOffset(offset));
ScaleFactor scale = ScaleFor(kMode_M1, mode);
int32_t disp = 0;
return Operand(index, scale, disp);
}
case kMode_M1I:
case kMode_M2I:
case kMode_M4I:
case kMode_M8I: {
Register index = InputRegister(NextOffset(offset));
ScaleFactor scale = ScaleFor(kMode_M1I, mode);
Constant ctant = ToConstant(instr_->InputAt(NextOffset(offset)));
return Operand(index, scale, ctant.ToInt32(), ctant.rmode());
}
case kMode_MI: {
Constant ctant = ToConstant(instr_->InputAt(NextOffset(offset)));
return Operand(ctant.ToInt32(), ctant.rmode());
}
case kMode_Root: {
Register base = kRootRegister;
int32_t disp = InputInt32(NextOffset(offset));
return Operand(base, disp);
}
case kMode_None:
UNREACHABLE();
}
UNREACHABLE();
}
Operand MemoryOperand(size_t first_input = 0) {
return MemoryOperand(&first_input);
}
Operand NextMemoryOperand(size_t offset = 0) {
AddressingMode mode = AddressingModeField::decode(instr_->opcode());
Register base = InputRegister(NextOffset(&offset));
const int32_t disp = 4;
if (mode == kMode_MR1) {
Register index = InputRegister(NextOffset(&offset));
ScaleFactor scale = ScaleFor(kMode_MR1, kMode_MR1);
return Operand(base, index, scale, disp);
} else if (mode == kMode_MRI) {
Constant ctant = ToConstant(instr_->InputAt(NextOffset(&offset)));
return Operand(base, ctant.ToInt32() + disp, ctant.rmode());
} else {
UNREACHABLE();
}
}
void MoveInstructionOperandToRegister(Register destination,
InstructionOperand* op) {
if (op->IsImmediate() || op->IsConstant()) {
gen_->tasm()->mov(destination, ToImmediate(op));
} else if (op->IsRegister()) {
gen_->tasm()->Move(destination, ToRegister(op));
} else {
gen_->tasm()->mov(destination, ToOperand(op));
}
}
};
namespace {
bool HasAddressingMode(Instruction* instr) {
return instr->addressing_mode() != kMode_None;
}
bool HasImmediateInput(Instruction* instr, size_t index) {
return instr->InputAt(index)->IsImmediate();
}
bool HasRegisterInput(Instruction* instr, size_t index) {
return instr->InputAt(index)->IsRegister();
}
class OutOfLineLoadFloat32NaN final : public OutOfLineCode {
public:
OutOfLineLoadFloat32NaN(CodeGenerator* gen, XMMRegister result)
: OutOfLineCode(gen), result_(result) {}
void Generate() final {
__ xorps(result_, result_);
__ divss(result_, result_);
}
private:
XMMRegister const result_;
};
class OutOfLineLoadFloat64NaN final : public OutOfLineCode {
public:
OutOfLineLoadFloat64NaN(CodeGenerator* gen, XMMRegister result)
: OutOfLineCode(gen), result_(result) {}
void Generate() final {
__ xorpd(result_, result_);
__ divsd(result_, result_);
}
private:
XMMRegister const result_;
};
class OutOfLineTruncateDoubleToI final : public OutOfLineCode {
public:
OutOfLineTruncateDoubleToI(CodeGenerator* gen, Register result,
XMMRegister input, StubCallMode stub_mode)
: OutOfLineCode(gen),
result_(result),
input_(input),
stub_mode_(stub_mode),
isolate_(gen->isolate()),
zone_(gen->zone()) {}
void Generate() final {
__ AllocateStackSpace(kDoubleSize);
__ movsd(MemOperand(esp, 0), input_);
if (stub_mode_ == StubCallMode::kCallWasmRuntimeStub) {
// A direct call to a wasm runtime stub defined in this module.
// Just encode the stub index. This will be patched when the code
// is added to the native module and copied into wasm code space.
__ wasm_call(wasm::WasmCode::kDoubleToI, RelocInfo::WASM_STUB_CALL);
} else if (tasm()->options().inline_offheap_trampolines) {
__ CallBuiltin(Builtins::kDoubleToI);
} else {
__ Call(BUILTIN_CODE(isolate_, DoubleToI), RelocInfo::CODE_TARGET);
}
__ mov(result_, MemOperand(esp, 0));
__ add(esp, Immediate(kDoubleSize));
}
private:
Register const result_;
XMMRegister const input_;
StubCallMode stub_mode_;
Isolate* isolate_;
Zone* zone_;
};
class OutOfLineRecordWrite final : public OutOfLineCode {
public:
OutOfLineRecordWrite(CodeGenerator* gen, Register object, Operand operand,
Register value, Register scratch0, Register scratch1,
RecordWriteMode mode, StubCallMode stub_mode)
: OutOfLineCode(gen),
object_(object),
operand_(operand),
value_(value),
scratch0_(scratch0),
scratch1_(scratch1),
mode_(mode),
stub_mode_(stub_mode),
zone_(gen->zone()) {}
void Generate() final {
if (mode_ > RecordWriteMode::kValueIsPointer) {
__ JumpIfSmi(value_, exit());
}
__ CheckPageFlag(value_, scratch0_,
MemoryChunk::kPointersToHereAreInterestingMask, zero,
exit());
__ lea(scratch1_, operand_);
RememberedSetAction const remembered_set_action =
mode_ > RecordWriteMode::kValueIsMap ? EMIT_REMEMBERED_SET
: OMIT_REMEMBERED_SET;
SaveFPRegsMode const save_fp_mode =
frame()->DidAllocateDoubleRegisters() ? kSaveFPRegs : kDontSaveFPRegs;
if (mode_ == RecordWriteMode::kValueIsEphemeronKey) {
__ CallEphemeronKeyBarrier(object_, scratch1_, save_fp_mode);
} else if (stub_mode_ == StubCallMode::kCallWasmRuntimeStub) {
// A direct call to a wasm runtime stub defined in this module.
// Just encode the stub index. This will be patched when the code
// is added to the native module and copied into wasm code space.
__ CallRecordWriteStub(object_, scratch1_, remembered_set_action,
save_fp_mode, wasm::WasmCode::kRecordWrite);
} else {
__ CallRecordWriteStub(object_, scratch1_, remembered_set_action,
save_fp_mode);
}
}
private:
Register const object_;
Operand const operand_;
Register const value_;
Register const scratch0_;
Register const scratch1_;
RecordWriteMode const mode_;
StubCallMode const stub_mode_;
Zone* zone_;
};
} // namespace
#define ASSEMBLE_COMPARE(asm_instr) \
do { \
if (HasAddressingMode(instr)) { \
size_t index = 0; \
Operand left = i.MemoryOperand(&index); \
if (HasImmediateInput(instr, index)) { \
__ asm_instr(left, i.InputImmediate(index)); \
} else { \
__ asm_instr(left, i.InputRegister(index)); \
} \
} else { \
if (HasImmediateInput(instr, 1)) { \
if (HasRegisterInput(instr, 0)) { \
__ asm_instr(i.InputRegister(0), i.InputImmediate(1)); \
} else { \
__ asm_instr(i.InputOperand(0), i.InputImmediate(1)); \
} \
} else { \
if (HasRegisterInput(instr, 1)) { \
__ asm_instr(i.InputRegister(0), i.InputRegister(1)); \
} else { \
__ asm_instr(i.InputRegister(0), i.InputOperand(1)); \
} \
} \
} \
} while (0)
#define ASSEMBLE_IEEE754_BINOP(name) \
do { \
/* Pass two doubles as arguments on the stack. */ \
__ PrepareCallCFunction(4, eax); \
__ movsd(Operand(esp, 0 * kDoubleSize), i.InputDoubleRegister(0)); \
__ movsd(Operand(esp, 1 * kDoubleSize), i.InputDoubleRegister(1)); \
__ CallCFunction(ExternalReference::ieee754_##name##_function(), 4); \
/* Return value is in st(0) on ia32. */ \
/* Store it into the result register. */ \
__ AllocateStackSpace(kDoubleSize); \
__ fstp_d(Operand(esp, 0)); \
__ movsd(i.OutputDoubleRegister(), Operand(esp, 0)); \
__ add(esp, Immediate(kDoubleSize)); \
} while (false)
#define ASSEMBLE_IEEE754_UNOP(name) \
do { \
/* Pass one double as argument on the stack. */ \
__ PrepareCallCFunction(2, eax); \
__ movsd(Operand(esp, 0 * kDoubleSize), i.InputDoubleRegister(0)); \
__ CallCFunction(ExternalReference::ieee754_##name##_function(), 2); \
/* Return value is in st(0) on ia32. */ \
/* Store it into the result register. */ \
__ AllocateStackSpace(kDoubleSize); \
__ fstp_d(Operand(esp, 0)); \
__ movsd(i.OutputDoubleRegister(), Operand(esp, 0)); \
__ add(esp, Immediate(kDoubleSize)); \
} while (false)
#define ASSEMBLE_BINOP(asm_instr) \
do { \
if (HasAddressingMode(instr)) { \
size_t index = 1; \
Operand right = i.MemoryOperand(&index); \
__ asm_instr(i.InputRegister(0), right); \
} else { \
if (HasImmediateInput(instr, 1)) { \
__ asm_instr(i.InputOperand(0), i.InputImmediate(1)); \
} else { \
__ asm_instr(i.InputRegister(0), i.InputOperand(1)); \
} \
} \
} while (0)
#define ASSEMBLE_ATOMIC_BINOP(bin_inst, mov_inst, cmpxchg_inst) \
do { \
Label binop; \
__ bind(&binop); \
__ mov_inst(eax, i.MemoryOperand(1)); \
__ Move(i.TempRegister(0), eax); \
__ bin_inst(i.TempRegister(0), i.InputRegister(0)); \
__ lock(); \
__ cmpxchg_inst(i.MemoryOperand(1), i.TempRegister(0)); \
__ j(not_equal, &binop); \
} while (false)
#define ASSEMBLE_I64ATOMIC_BINOP(instr1, instr2) \
do { \
Label binop; \
__ bind(&binop); \
__ mov(eax, i.MemoryOperand(2)); \
__ mov(edx, i.NextMemoryOperand(2)); \
__ push(ebx); \
frame_access_state()->IncreaseSPDelta(1); \
i.MoveInstructionOperandToRegister(ebx, instr->InputAt(0)); \
__ push(i.InputRegister(1)); \
__ instr1(ebx, eax); \
__ instr2(i.InputRegister(1), edx); \
__ lock(); \
__ cmpxchg8b(i.MemoryOperand(2)); \
__ pop(i.InputRegister(1)); \
__ pop(ebx); \
frame_access_state()->IncreaseSPDelta(-1); \
__ j(not_equal, &binop); \
} while (false);
#define ASSEMBLE_MOVX(mov_instr) \
do { \
if (HasAddressingMode(instr)) { \
__ mov_instr(i.OutputRegister(), i.MemoryOperand()); \
} else if (HasRegisterInput(instr, 0)) { \
__ mov_instr(i.OutputRegister(), i.InputRegister(0)); \
} else { \
__ mov_instr(i.OutputRegister(), i.InputOperand(0)); \
} \
} while (0)
#define ASSEMBLE_SIMD_PUNPCK_SHUFFLE(opcode) \
do { \
XMMRegister src0 = i.InputSimd128Register(0); \
Operand src1 = i.InputOperand(instr->InputCount() == 2 ? 1 : 0); \
if (CpuFeatures::IsSupported(AVX)) { \
CpuFeatureScope avx_scope(tasm(), AVX); \
__ v##opcode(i.OutputSimd128Register(), src0, src1); \
} else { \
DCHECK_EQ(i.OutputSimd128Register(), src0); \
__ opcode(i.OutputSimd128Register(), src1); \
} \
} while (false)
#define ASSEMBLE_SIMD_IMM_SHUFFLE(opcode, SSELevel, imm) \
if (CpuFeatures::IsSupported(AVX)) { \
CpuFeatureScope avx_scope(tasm(), AVX); \
__ v##opcode(i.OutputSimd128Register(), i.InputSimd128Register(0), \
i.InputOperand(1), imm); \
} else { \
CpuFeatureScope sse_scope(tasm(), SSELevel); \
DCHECK_EQ(i.OutputSimd128Register(), i.InputSimd128Register(0)); \
__ opcode(i.OutputSimd128Register(), i.InputOperand(1), imm); \
}
#define ASSEMBLE_SIMD_ALL_TRUE(opcode) \
do { \
Register dst = i.OutputRegister(); \
Operand src = i.InputOperand(0); \
Register tmp = i.TempRegister(0); \
XMMRegister tmp_simd = i.TempSimd128Register(1); \
__ mov(tmp, Immediate(1)); \
__ xor_(dst, dst); \
__ Pxor(tmp_simd, tmp_simd); \
__ opcode(tmp_simd, src); \
__ Ptest(tmp_simd, tmp_simd); \
__ cmov(zero, dst, tmp); \
} while (false)
#define ASSEMBLE_SIMD_SHIFT(opcode, width) \
do { \
XMMRegister dst = i.OutputSimd128Register(); \
DCHECK_EQ(dst, i.InputSimd128Register(0)); \
if (HasImmediateInput(instr, 1)) { \
__ opcode(dst, dst, byte{i.InputInt##width(1)}); \
} else { \
XMMRegister tmp = i.TempSimd128Register(0); \
Register tmp_shift = i.TempRegister(1); \
constexpr int mask = (1 << width) - 1; \
__ mov(tmp_shift, i.InputRegister(1)); \
__ and_(tmp_shift, Immediate(mask)); \
__ Movd(tmp, tmp_shift); \
__ opcode(dst, dst, tmp); \
} \
} while (false)
void CodeGenerator::AssembleDeconstructFrame() {
__ mov(esp, ebp);
__ pop(ebp);
}
void CodeGenerator::AssemblePrepareTailCall() {
if (frame_access_state()->has_frame()) {
__ mov(ebp, MemOperand(ebp, 0));
}
frame_access_state()->SetFrameAccessToSP();
}
void CodeGenerator::AssemblePopArgumentsAdaptorFrame(Register args_reg,
Register, Register,
Register) {
// There are not enough temp registers left on ia32 for a call instruction
// so we pick some scratch registers and save/restore them manually here.
int scratch_count = 3;
Register scratch1 = esi;
Register scratch2 = ecx;
Register scratch3 = edx;
DCHECK(!AreAliased(args_reg, scratch1, scratch2, scratch3));
Label done;
// Check if current frame is an arguments adaptor frame.
__ cmp(Operand(ebp, StandardFrameConstants::kContextOffset),
Immediate(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
__ j(not_equal, &done, Label::kNear);
__ push(scratch1);
__ push(scratch2);
__ push(scratch3);
// Load arguments count from current arguments adaptor frame (note, it
// does not include receiver).
Register caller_args_count_reg = scratch1;
__ mov(caller_args_count_reg,
Operand(ebp, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ SmiUntag(caller_args_count_reg);
__ PrepareForTailCall(args_reg, caller_args_count_reg, scratch2, scratch3,
scratch_count);
__ pop(scratch3);
__ pop(scratch2);
__ pop(scratch1);
__ bind(&done);
}
namespace {
void AdjustStackPointerForTailCall(TurboAssembler* tasm,
FrameAccessState* state,
int new_slot_above_sp,
bool allow_shrinkage = true) {
int current_sp_offset = state->GetSPToFPSlotCount() +
StandardFrameConstants::kFixedSlotCountAboveFp;
int stack_slot_delta = new_slot_above_sp - current_sp_offset;
if (stack_slot_delta > 0) {
tasm->AllocateStackSpace(stack_slot_delta * kSystemPointerSize);
state->IncreaseSPDelta(stack_slot_delta);
} else if (allow_shrinkage && stack_slot_delta < 0) {
tasm->add(esp, Immediate(-stack_slot_delta * kSystemPointerSize));
state->IncreaseSPDelta(stack_slot_delta);
}
}
#ifdef DEBUG
bool VerifyOutputOfAtomicPairInstr(IA32OperandConverter* converter,
const Instruction* instr) {
if (instr->OutputCount() == 2) {
return (converter->OutputRegister(0) == eax &&
converter->OutputRegister(1) == edx);
}
if (instr->OutputCount() == 1) {
return (converter->OutputRegister(0) == eax &&
converter->TempRegister(0) == edx) ||
(converter->OutputRegister(0) == edx &&
converter->TempRegister(0) == eax);
}
DCHECK_EQ(instr->OutputCount(), 0);
return (converter->TempRegister(0) == eax &&
converter->TempRegister(1) == edx);
}
#endif
} // namespace
void CodeGenerator::AssembleTailCallBeforeGap(Instruction* instr,
int first_unused_stack_slot) {
CodeGenerator::PushTypeFlags flags(kImmediatePush | kScalarPush);
ZoneVector<MoveOperands*> pushes(zone());
GetPushCompatibleMoves(instr, flags, &pushes);
if (!pushes.empty() &&
(LocationOperand::cast(pushes.back()->destination()).index() + 1 ==
first_unused_stack_slot)) {
IA32OperandConverter g(this, instr);
for (auto move : pushes) {
LocationOperand destination_location(
LocationOperand::cast(move->destination()));
InstructionOperand source(move->source());
AdjustStackPointerForTailCall(tasm(), frame_access_state(),
destination_location.index());
if (source.IsStackSlot()) {
LocationOperand source_location(LocationOperand::cast(source));
__ push(g.SlotToOperand(source_location.index()));
} else if (source.IsRegister()) {
LocationOperand source_location(LocationOperand::cast(source));
__ push(source_location.GetRegister());
} else if (source.IsImmediate()) {
__ Push(Immediate(ImmediateOperand::cast(source).inline_value()));
} else {
// Pushes of non-scalar data types is not supported.
UNIMPLEMENTED();
}
frame_access_state()->IncreaseSPDelta(1);
move->Eliminate();
}
}
AdjustStackPointerForTailCall(tasm(), frame_access_state(),
first_unused_stack_slot, false);
}
void CodeGenerator::AssembleTailCallAfterGap(Instruction* instr,
int first_unused_stack_slot) {
AdjustStackPointerForTailCall(tasm(), frame_access_state(),
first_unused_stack_slot);
}
// Check that {kJavaScriptCallCodeStartRegister} is correct.
void CodeGenerator::AssembleCodeStartRegisterCheck() {
__ push(eax); // Push eax so we can use it as a scratch register.
__ ComputeCodeStartAddress(eax);
__ cmp(eax, kJavaScriptCallCodeStartRegister);
__ Assert(equal, AbortReason::kWrongFunctionCodeStart);
__ pop(eax); // Restore eax.
}
// Check if the code object is marked for deoptimization. If it is, then it
// jumps to the CompileLazyDeoptimizedCode builtin. In order to do this we need
// to:
// 1. read from memory the word that contains that bit, which can be found in
// the flags in the referenced {CodeDataContainer} object;
// 2. test kMarkedForDeoptimizationBit in those flags; and
// 3. if it is not zero then it jumps to the builtin.
void CodeGenerator::BailoutIfDeoptimized() {
int offset = Code::kCodeDataContainerOffset - Code::kHeaderSize;
__ push(eax); // Push eax so we can use it as a scratch register.
__ mov(eax, Operand(kJavaScriptCallCodeStartRegister, offset));
__ test(FieldOperand(eax, CodeDataContainer::kKindSpecificFlagsOffset),
Immediate(1 << Code::kMarkedForDeoptimizationBit));
__ pop(eax); // Restore eax.
Label skip;
__ j(zero, &skip, Label::kNear);
__ Jump(BUILTIN_CODE(isolate(), CompileLazyDeoptimizedCode),
RelocInfo::CODE_TARGET);
__ bind(&skip);
}
void CodeGenerator::GenerateSpeculationPoisonFromCodeStartRegister() {
// TODO(860429): Remove remaining poisoning infrastructure on ia32.
UNREACHABLE();
}
void CodeGenerator::AssembleRegisterArgumentPoisoning() {
// TODO(860429): Remove remaining poisoning infrastructure on ia32.
UNREACHABLE();
}
// Assembles an instruction after register allocation, producing machine code.
CodeGenerator::CodeGenResult CodeGenerator::AssembleArchInstruction(
Instruction* instr) {
IA32OperandConverter i(this, instr);
InstructionCode opcode = instr->opcode();
ArchOpcode arch_opcode = ArchOpcodeField::decode(opcode);
switch (arch_opcode) {
case kArchCallCodeObject: {
InstructionOperand* op = instr->InputAt(0);
if (op->IsImmediate()) {
Handle<Code> code = i.InputCode(0);
__ Call(code, RelocInfo::CODE_TARGET);
} else {
Register reg = i.InputRegister(0);
DCHECK_IMPLIES(
HasCallDescriptorFlag(instr, CallDescriptor::kFixedTargetRegister),
reg == kJavaScriptCallCodeStartRegister);
__ LoadCodeObjectEntry(reg, reg);
if (HasCallDescriptorFlag(instr, CallDescriptor::kRetpoline)) {
__ RetpolineCall(reg);
} else {
__ call(reg);
}
}
RecordCallPosition(instr);
frame_access_state()->ClearSPDelta();
break;
}
case kArchCallBuiltinPointer: {
DCHECK(!HasImmediateInput(instr, 0));
Register builtin_index = i.InputRegister(0);
__ CallBuiltinByIndex(builtin_index);
RecordCallPosition(instr);
frame_access_state()->ClearSPDelta();
break;
}
case kArchCallWasmFunction: {
if (HasImmediateInput(instr, 0)) {
Constant constant = i.ToConstant(instr->InputAt(0));
Address wasm_code = static_cast<Address>(constant.ToInt32());
if (DetermineStubCallMode() == StubCallMode::kCallWasmRuntimeStub) {
__ wasm_call(wasm_code, constant.rmode());
} else {
if (HasCallDescriptorFlag(instr, CallDescriptor::kRetpoline)) {
__ RetpolineCall(wasm_code, constant.rmode());
} else {
__ call(wasm_code, constant.rmode());
}
}
} else {
Register reg = i.InputRegister(0);
if (HasCallDescriptorFlag(instr, CallDescriptor::kRetpoline)) {
__ RetpolineCall(reg);
} else {
__ call(reg);
}
}
RecordCallPosition(instr);
frame_access_state()->ClearSPDelta();
break;
}
case kArchTailCallCodeObjectFromJSFunction:
case kArchTailCallCodeObject: {
if (arch_opcode == kArchTailCallCodeObjectFromJSFunction) {
AssemblePopArgumentsAdaptorFrame(kJavaScriptCallArgCountRegister,
no_reg, no_reg, no_reg);
}
if (HasImmediateInput(instr, 0)) {
Handle<Code> code = i.InputCode(0);
__ Jump(code, RelocInfo::CODE_TARGET);
} else {
Register reg = i.InputRegister(0);
DCHECK_IMPLIES(
HasCallDescriptorFlag(instr, CallDescriptor::kFixedTargetRegister),
reg == kJavaScriptCallCodeStartRegister);
__ LoadCodeObjectEntry(reg, reg);
if (HasCallDescriptorFlag(instr, CallDescriptor::kRetpoline)) {
__ RetpolineJump(reg);
} else {
__ jmp(reg);
}
}
frame_access_state()->ClearSPDelta();
frame_access_state()->SetFrameAccessToDefault();
break;
}
case kArchTailCallWasm: {
if (HasImmediateInput(instr, 0)) {
Constant constant = i.ToConstant(instr->InputAt(0));
Address wasm_code = static_cast<Address>(constant.ToInt32());
__ jmp(wasm_code, constant.rmode());
} else {
Register reg = i.InputRegister(0);
if (HasCallDescriptorFlag(instr, CallDescriptor::kRetpoline)) {
__ RetpolineJump(reg);
} else {
__ jmp(reg);
}
}
frame_access_state()->ClearSPDelta();
frame_access_state()->SetFrameAccessToDefault();
break;
}
case kArchTailCallAddress: {
CHECK(!HasImmediateInput(instr, 0));
Register reg = i.InputRegister(0);
DCHECK_IMPLIES(
HasCallDescriptorFlag(instr, CallDescriptor::kFixedTargetRegister),
reg == kJavaScriptCallCodeStartRegister);
if (HasCallDescriptorFlag(instr, CallDescriptor::kRetpoline)) {
__ RetpolineJump(reg);
} else {
__ jmp(reg);
}
frame_access_state()->ClearSPDelta();
frame_access_state()->SetFrameAccessToDefault();
break;
}
case kArchCallJSFunction: {
Register func = i.InputRegister(0);
if (FLAG_debug_code) {
// Check the function's context matches the context argument.
__ cmp(esi, FieldOperand(func, JSFunction::kContextOffset));
__ Assert(equal, AbortReason::kWrongFunctionContext);
}
static_assert(kJavaScriptCallCodeStartRegister == ecx, "ABI mismatch");
__ mov(ecx, FieldOperand(func, JSFunction::kCodeOffset));
__ CallCodeObject(ecx);
RecordCallPosition(instr);
frame_access_state()->ClearSPDelta();
break;
}
case kArchPrepareCallCFunction: {
// Frame alignment requires using FP-relative frame addressing.
frame_access_state()->SetFrameAccessToFP();
int const num_parameters = MiscField::decode(instr->opcode());
__ PrepareCallCFunction(num_parameters, i.TempRegister(0));
break;
}
case kArchSaveCallerRegisters: {
fp_mode_ =
static_cast<SaveFPRegsMode>(MiscField::decode(instr->opcode()));
DCHECK(fp_mode_ == kDontSaveFPRegs || fp_mode_ == kSaveFPRegs);
// kReturnRegister0 should have been saved before entering the stub.
int bytes = __ PushCallerSaved(fp_mode_, kReturnRegister0);
DCHECK(IsAligned(bytes, kSystemPointerSize));
DCHECK_EQ(0, frame_access_state()->sp_delta());
frame_access_state()->IncreaseSPDelta(bytes / kSystemPointerSize);
DCHECK(!caller_registers_saved_);
caller_registers_saved_ = true;
break;
}
case kArchRestoreCallerRegisters: {
DCHECK(fp_mode_ ==
static_cast<SaveFPRegsMode>(MiscField::decode(instr->opcode())));
DCHECK(fp_mode_ == kDontSaveFPRegs || fp_mode_ == kSaveFPRegs);
// Don't overwrite the returned value.
int bytes = __ PopCallerSaved(fp_mode_, kReturnRegister0);
frame_access_state()->IncreaseSPDelta(-(bytes / kSystemPointerSize));
DCHECK_EQ(0, frame_access_state()->sp_delta());
DCHECK(caller_registers_saved_);
caller_registers_saved_ = false;
break;
}
case kArchPrepareTailCall:
AssemblePrepareTailCall();
break;
case kArchCallCFunction: {
int const num_parameters = MiscField::decode(instr->opcode());
Label return_location;
if (linkage()->GetIncomingDescriptor()->IsWasmCapiFunction()) {
// Put the return address in a stack slot.
Register scratch = eax;
__ push(scratch);
__ PushPC();
int pc = __ pc_offset();
__ pop(scratch);
__ sub(scratch, Immediate(pc + Code::kHeaderSize - kHeapObjectTag));
__ add(scratch, Immediate::CodeRelativeOffset(&return_location));
__ mov(MemOperand(ebp, WasmExitFrameConstants::kCallingPCOffset),
scratch);
__ pop(scratch);
}
if (HasImmediateInput(instr, 0)) {
ExternalReference ref = i.InputExternalReference(0);
__ CallCFunction(ref, num_parameters);
} else {
Register func = i.InputRegister(0);
__ CallCFunction(func, num_parameters);
}
__ bind(&return_location);
if (linkage()->GetIncomingDescriptor()->IsWasmCapiFunction()) {
RecordSafepoint(instr->reference_map(), Safepoint::kNoLazyDeopt);
}
frame_access_state()->SetFrameAccessToDefault();
// Ideally, we should decrement SP delta to match the change of stack
// pointer in CallCFunction. However, for certain architectures (e.g.
// ARM), there may be more strict alignment requirement, causing old SP
// to be saved on the stack. In those cases, we can not calculate the SP
// delta statically.
frame_access_state()->ClearSPDelta();
if (caller_registers_saved_) {
// Need to re-sync SP delta introduced in kArchSaveCallerRegisters.
// Here, we assume the sequence to be:
// kArchSaveCallerRegisters;
// kArchCallCFunction;
// kArchRestoreCallerRegisters;
int bytes =
__ RequiredStackSizeForCallerSaved(fp_mode_, kReturnRegister0);
frame_access_state()->IncreaseSPDelta(bytes / kSystemPointerSize);
}
break;
}
case kArchJmp:
AssembleArchJump(i.InputRpo(0));
break;
case kArchBinarySearchSwitch:
AssembleArchBinarySearchSwitch(instr);
break;
case kArchTableSwitch:
AssembleArchTableSwitch(instr);
break;
case kArchComment:
__ RecordComment(reinterpret_cast<const char*>(i.InputInt32(0)));
break;
case kArchAbortCSAAssert:
DCHECK(i.InputRegister(0) == edx);
{
// We don't actually want to generate a pile of code for this, so just
// claim there is a stack frame, without generating one.
FrameScope scope(tasm(), StackFrame::NONE);
__ Call(
isolate()->builtins()->builtin_handle(Builtins::kAbortCSAAssert),
RelocInfo::CODE_TARGET);
}
__ int3();
break;
case kArchDebugBreak:
__ DebugBreak();
break;
case kArchNop:
case kArchThrowTerminator:
// don't emit code for nops.
break;
case kArchDeoptimize: {
DeoptimizationExit* exit =
BuildTranslation(instr, -1, 0, OutputFrameStateCombine::Ignore());
CodeGenResult result = AssembleDeoptimizerCall(exit);
if (result != kSuccess) return result;
break;
}
case kArchRet:
AssembleReturn(instr->InputAt(0));
break;
case kArchFramePointer:
__ mov(i.OutputRegister(), ebp);
break;
case kArchParentFramePointer:
if (frame_access_state()->has_frame()) {
__ mov(i.OutputRegister(), Operand(ebp, 0));
} else {
__ mov(i.OutputRegister(), ebp);
}
break;
case kArchStackPointerGreaterThan: {
// Potentially apply an offset to the current stack pointer before the
// comparison to consider the size difference of an optimized frame versus
// the contained unoptimized frames.
Register lhs_register = esp;
uint32_t offset;
if (ShouldApplyOffsetToStackCheck(instr, &offset)) {
lhs_register = i.TempRegister(0);
__ lea(lhs_register, Operand(esp, -1 * static_cast<int32_t>(offset)));
}
constexpr size_t kValueIndex = 0;
if (HasAddressingMode(instr)) {
__ cmp(lhs_register, i.MemoryOperand(kValueIndex));
} else {
__ cmp(lhs_register, i.InputRegister(kValueIndex));
}
break;
}
case kArchStackCheckOffset:
__ Move(i.OutputRegister(), Smi::FromInt(GetStackCheckOffset()));
break;
case kArchTruncateDoubleToI: {
auto result = i.OutputRegister();
auto input = i.InputDoubleRegister(0);
auto ool = new (zone()) OutOfLineTruncateDoubleToI(
this, result, input, DetermineStubCallMode());
__ cvttsd2si(result, Operand(input));
__ cmp(result, 1);
__ j(overflow, ool->entry());
__ bind(ool->exit());
break;
}
case kArchStoreWithWriteBarrier: {
RecordWriteMode mode =
static_cast<RecordWriteMode>(MiscField::decode(instr->opcode()));
Register object = i.InputRegister(0);
size_t index = 0;
Operand operand = i.MemoryOperand(&index);
Register value = i.InputRegister(index);
Register scratch0 = i.TempRegister(0);
Register scratch1 = i.TempRegister(1);
auto ool = new (zone())
OutOfLineRecordWrite(this, object, operand, value, scratch0, scratch1,
mode, DetermineStubCallMode());
__ mov(operand, value);
__ CheckPageFlag(object, scratch0,
MemoryChunk::kPointersFromHereAreInterestingMask,
not_zero, ool->entry());
__ bind(ool->exit());
break;
}
case kArchStackSlot: {