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// Copyright 2012 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.
#if V8_TARGET_ARCH_X64
#include "src/base/bits.h"
#include "src/base/division-by-constant.h"
#include "src/base/utils/random-number-generator.h"
#include "src/codegen/callable.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/external-reference-table.h"
#include "src/codegen/macro-assembler.h"
#include "src/codegen/register-configuration.h"
#include "src/codegen/string-constants.h"
#include "src/codegen/x64/assembler-x64.h"
#include "src/common/external-pointer.h"
#include "src/common/globals.h"
#include "src/debug/debug.h"
#include "src/execution/frames-inl.h"
#include "src/heap/memory-chunk.h"
#include "src/init/bootstrapper.h"
#include "src/logging/counters.h"
#include "src/objects/objects-inl.h"
#include "src/objects/smi.h"
#include "src/snapshot/embedded/embedded-data.h"
#include "src/snapshot/snapshot.h"
// Satisfy cpplint check, but don't include platform-specific header. It is
// included recursively via macro-assembler.h.
#if 0
#include "src/codegen/x64/macro-assembler-x64.h"
#endif
namespace v8 {
namespace internal {
Operand StackArgumentsAccessor::GetArgumentOperand(int index) const {
DCHECK_GE(index, 0);
// arg[0] = rsp + kPCOnStackSize;
// arg[i] = arg[0] + i * kSystemPointerSize;
return Operand(rsp, kPCOnStackSize + index * kSystemPointerSize);
}
void MacroAssembler::Load(Register destination, ExternalReference source) {
if (root_array_available_ && options().enable_root_array_delta_access) {
intptr_t delta = RootRegisterOffsetForExternalReference(isolate(), source);
if (is_int32(delta)) {
movq(destination, Operand(kRootRegister, static_cast<int32_t>(delta)));
return;
}
}
// Safe code.
if (destination == rax && !options().isolate_independent_code) {
load_rax(source);
} else {
movq(destination, ExternalReferenceAsOperand(source));
}
}
void MacroAssembler::Store(ExternalReference destination, Register source) {
if (root_array_available_ && options().enable_root_array_delta_access) {
intptr_t delta =
RootRegisterOffsetForExternalReference(isolate(), destination);
if (is_int32(delta)) {
movq(Operand(kRootRegister, static_cast<int32_t>(delta)), source);
return;
}
}
// Safe code.
if (source == rax && !options().isolate_independent_code) {
store_rax(destination);
} else {
movq(ExternalReferenceAsOperand(destination), source);
}
}
void TurboAssembler::LoadFromConstantsTable(Register destination,
int constant_index) {
DCHECK(RootsTable::IsImmortalImmovable(RootIndex::kBuiltinsConstantsTable));
LoadRoot(destination, RootIndex::kBuiltinsConstantsTable);
LoadTaggedPointerField(
destination,
FieldOperand(destination, FixedArray::OffsetOfElementAt(constant_index)));
}
void TurboAssembler::LoadRootRegisterOffset(Register destination,
intptr_t offset) {
DCHECK(is_int32(offset));
if (offset == 0) {
Move(destination, kRootRegister);
} else {
leaq(destination, Operand(kRootRegister, static_cast<int32_t>(offset)));
}
}
void TurboAssembler::LoadRootRelative(Register destination, int32_t offset) {
movq(destination, Operand(kRootRegister, offset));
}
void TurboAssembler::LoadAddress(Register destination,
ExternalReference source) {
if (root_array_available_ && options().enable_root_array_delta_access) {
intptr_t delta = RootRegisterOffsetForExternalReference(isolate(), source);
if (is_int32(delta)) {
leaq(destination, Operand(kRootRegister, static_cast<int32_t>(delta)));
return;
}
}
// Safe code.
// TODO(jgruber,v8:8887): Also consider a root-relative load when generating
// non-isolate-independent code. In many cases it might be cheaper than
// embedding the relocatable value.
if (root_array_available_ && options().isolate_independent_code) {
IndirectLoadExternalReference(destination, source);
return;
}
Move(destination, source);
}
Operand TurboAssembler::ExternalReferenceAsOperand(ExternalReference reference,
Register scratch) {
if (root_array_available_ && options().enable_root_array_delta_access) {
int64_t delta =
RootRegisterOffsetForExternalReference(isolate(), reference);
if (is_int32(delta)) {
return Operand(kRootRegister, static_cast<int32_t>(delta));
}
}
if (root_array_available_ && options().isolate_independent_code) {
if (IsAddressableThroughRootRegister(isolate(), reference)) {
// Some external references can be efficiently loaded as an offset from
// kRootRegister.
intptr_t offset =
RootRegisterOffsetForExternalReference(isolate(), reference);
CHECK(is_int32(offset));
return Operand(kRootRegister, static_cast<int32_t>(offset));
} else {
// Otherwise, do a memory load from the external reference table.
movq(scratch, Operand(kRootRegister,
RootRegisterOffsetForExternalReferenceTableEntry(
isolate(), reference)));
return Operand(scratch, 0);
}
}
Move(scratch, reference);
return Operand(scratch, 0);
}
void MacroAssembler::PushAddress(ExternalReference source) {
LoadAddress(kScratchRegister, source);
Push(kScratchRegister);
}
void TurboAssembler::LoadRoot(Register destination, RootIndex index) {
DCHECK(root_array_available_);
movq(destination,
Operand(kRootRegister, RootRegisterOffsetForRootIndex(index)));
}
void MacroAssembler::PushRoot(RootIndex index) {
DCHECK(root_array_available_);
Push(Operand(kRootRegister, RootRegisterOffsetForRootIndex(index)));
}
void TurboAssembler::CompareRoot(Register with, RootIndex index) {
DCHECK(root_array_available_);
if (base::IsInRange(index, RootIndex::kFirstStrongOrReadOnlyRoot,
RootIndex::kLastStrongOrReadOnlyRoot)) {
cmp_tagged(with,
Operand(kRootRegister, RootRegisterOffsetForRootIndex(index)));
} else {
// Some smi roots contain system pointer size values like stack limits.
cmpq(with, Operand(kRootRegister, RootRegisterOffsetForRootIndex(index)));
}
}
void TurboAssembler::CompareRoot(Operand with, RootIndex index) {
DCHECK(root_array_available_);
DCHECK(!with.AddressUsesRegister(kScratchRegister));
LoadRoot(kScratchRegister, index);
if (base::IsInRange(index, RootIndex::kFirstStrongOrReadOnlyRoot,
RootIndex::kLastStrongOrReadOnlyRoot)) {
cmp_tagged(with, kScratchRegister);
} else {
// Some smi roots contain system pointer size values like stack limits.
cmpq(with, kScratchRegister);
}
}
void TurboAssembler::LoadMap(Register destination, Register object) {
LoadTaggedPointerField(destination,
FieldOperand(object, HeapObject::kMapOffset));
}
void TurboAssembler::LoadTaggedPointerField(Register destination,
Operand field_operand) {
if (COMPRESS_POINTERS_BOOL) {
DecompressTaggedPointer(destination, field_operand);
} else {
mov_tagged(destination, field_operand);
}
}
void TurboAssembler::LoadAnyTaggedField(Register destination,
Operand field_operand) {
if (COMPRESS_POINTERS_BOOL) {
DecompressAnyTagged(destination, field_operand);
} else {
mov_tagged(destination, field_operand);
}
}
void TurboAssembler::PushTaggedPointerField(Operand field_operand,
Register scratch) {
if (COMPRESS_POINTERS_BOOL) {
DCHECK(!field_operand.AddressUsesRegister(scratch));
DecompressTaggedPointer(scratch, field_operand);
Push(scratch);
} else {
Push(field_operand);
}
}
void TurboAssembler::PushTaggedAnyField(Operand field_operand,
Register scratch) {
if (COMPRESS_POINTERS_BOOL) {
DCHECK(!field_operand.AddressUsesRegister(scratch));
DecompressAnyTagged(scratch, field_operand);
Push(scratch);
} else {
Push(field_operand);
}
}
void TurboAssembler::SmiUntagField(Register dst, Operand src) {
SmiUntag(dst, src);
}
void TurboAssembler::StoreTaggedField(Operand dst_field_operand,
Immediate value) {
if (COMPRESS_POINTERS_BOOL) {
movl(dst_field_operand, value);
} else {
movq(dst_field_operand, value);
}
}
void TurboAssembler::StoreTaggedField(Operand dst_field_operand,
Register value) {
if (COMPRESS_POINTERS_BOOL) {
movl(dst_field_operand, value);
} else {
movq(dst_field_operand, value);
}
}
void TurboAssembler::DecompressTaggedSigned(Register destination,
Operand field_operand) {
RecordComment("[ DecompressTaggedSigned");
movl(destination, field_operand);
RecordComment("]");
}
void TurboAssembler::DecompressTaggedPointer(Register destination,
Operand field_operand) {
RecordComment("[ DecompressTaggedPointer");
movl(destination, field_operand);
addq(destination, kRootRegister);
RecordComment("]");
}
void TurboAssembler::DecompressTaggedPointer(Register destination,
Register source) {
RecordComment("[ DecompressTaggedPointer");
movl(destination, source);
addq(destination, kRootRegister);
RecordComment("]");
}
void TurboAssembler::DecompressAnyTagged(Register destination,
Operand field_operand) {
RecordComment("[ DecompressAnyTagged");
movl(destination, field_operand);
addq(destination, kRootRegister);
RecordComment("]");
}
void MacroAssembler::RecordWriteField(Register object, int offset,
Register value, Register dst,
SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action,
SmiCheck smi_check) {
// First, check if a write barrier is even needed. The tests below
// catch stores of Smis.
Label done;
// Skip barrier if writing a smi.
if (smi_check == INLINE_SMI_CHECK) {
JumpIfSmi(value, &done);
}
// Although the object register is tagged, the offset is relative to the start
// of the object, so the offset must be a multiple of kTaggedSize.
DCHECK(IsAligned(offset, kTaggedSize));
leaq(dst, FieldOperand(object, offset));
if (emit_debug_code()) {
Label ok;
testb(dst, Immediate(kTaggedSize - 1));
j(zero, &ok, Label::kNear);
int3();
bind(&ok);
}
RecordWrite(object, dst, value, save_fp, remembered_set_action,
OMIT_SMI_CHECK);
bind(&done);
// Clobber clobbered input registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
Move(value, kZapValue, RelocInfo::NONE);
Move(dst, kZapValue, RelocInfo::NONE);
}
}
void TurboAssembler::SaveRegisters(RegList registers) {
DCHECK_GT(NumRegs(registers), 0);
for (int i = 0; i < Register::kNumRegisters; ++i) {
if ((registers >> i) & 1u) {
pushq(Register::from_code(i));
}
}
}
void TurboAssembler::LoadExternalPointerField(Register destination,
Operand field_operand,
ExternalPointerTag tag) {
#ifdef V8_HEAP_SANDBOX
LoadAddress(kScratchRegister,
ExternalReference::external_pointer_table_address(isolate()));
movq(kScratchRegister,
Operand(kScratchRegister, Internals::kExternalPointerTableBufferOffset));
movl(destination, field_operand);
movq(destination, Operand(kScratchRegister, destination, times_8, 0));
if (tag != 0) {
movq(kScratchRegister, Immediate64(tag));
xorq(destination, kScratchRegister);
}
#else
movq(destination, field_operand);
#endif // V8_HEAP_SANDBOX
}
void TurboAssembler::RestoreRegisters(RegList registers) {
DCHECK_GT(NumRegs(registers), 0);
for (int i = Register::kNumRegisters - 1; i >= 0; --i) {
if ((registers >> i) & 1u) {
popq(Register::from_code(i));
}
}
}
void TurboAssembler::CallEphemeronKeyBarrier(Register object, Register address,
SaveFPRegsMode fp_mode) {
EphemeronKeyBarrierDescriptor descriptor;
RegList registers = descriptor.allocatable_registers();
SaveRegisters(registers);
Register object_parameter(
descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kObject));
Register slot_parameter(descriptor.GetRegisterParameter(
EphemeronKeyBarrierDescriptor::kSlotAddress));
Register fp_mode_parameter(
descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kFPMode));
MovePair(slot_parameter, address, object_parameter, object);
Smi smi_fm = Smi::FromEnum(fp_mode);
Move(fp_mode_parameter, smi_fm);
Call(isolate()->builtins()->builtin_handle(Builtins::kEphemeronKeyBarrier),
RelocInfo::CODE_TARGET);
RestoreRegisters(registers);
}
void TurboAssembler::CallRecordWriteStub(
Register object, Register address,
RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode) {
CallRecordWriteStub(
object, address, remembered_set_action, fp_mode,
isolate()->builtins()->builtin_handle(Builtins::kRecordWrite),
kNullAddress);
}
void TurboAssembler::CallRecordWriteStub(
Register object, Register address,
RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode,
Address wasm_target) {
CallRecordWriteStub(object, address, remembered_set_action, fp_mode,
Handle<Code>::null(), wasm_target);
}
void TurboAssembler::CallRecordWriteStub(
Register object, Register address,
RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode,
Handle<Code> code_target, Address wasm_target) {
DCHECK_NE(code_target.is_null(), wasm_target == kNullAddress);
RecordWriteDescriptor descriptor;
RegList registers = descriptor.allocatable_registers();
SaveRegisters(registers);
Register object_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kObject));
Register slot_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kSlot));
Register remembered_set_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kRememberedSet));
Register fp_mode_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kFPMode));
// Prepare argument registers for calling RecordWrite
// slot_parameter <= address
// object_parameter <= object
MovePair(slot_parameter, address, object_parameter, object);
Smi smi_rsa = Smi::FromEnum(remembered_set_action);
Smi smi_fm = Smi::FromEnum(fp_mode);
Move(remembered_set_parameter, smi_rsa);
if (smi_rsa != smi_fm) {
Move(fp_mode_parameter, smi_fm);
} else {
movq(fp_mode_parameter, remembered_set_parameter);
}
if (code_target.is_null()) {
// Use {near_call} for direct Wasm call within a module.
near_call(wasm_target, RelocInfo::WASM_STUB_CALL);
} else {
Call(code_target, RelocInfo::CODE_TARGET);
}
RestoreRegisters(registers);
}
void MacroAssembler::RecordWrite(Register object, Register address,
Register value, SaveFPRegsMode fp_mode,
RememberedSetAction remembered_set_action,
SmiCheck smi_check) {
DCHECK(object != value);
DCHECK(object != address);
DCHECK(value != address);
AssertNotSmi(object);
if ((remembered_set_action == OMIT_REMEMBERED_SET &&
!FLAG_incremental_marking) ||
FLAG_disable_write_barriers) {
return;
}
if (emit_debug_code()) {
Label ok;
cmp_tagged(value, Operand(address, 0));
j(equal, &ok, Label::kNear);
int3();
bind(&ok);
}
// First, check if a write barrier is even needed. The tests below
// catch stores of smis and stores into the young generation.
Label done;
if (smi_check == INLINE_SMI_CHECK) {
// Skip barrier if writing a smi.
JumpIfSmi(value, &done);
}
CheckPageFlag(value,
value, // Used as scratch.
MemoryChunk::kPointersToHereAreInterestingMask, zero, &done,
Label::kNear);
CheckPageFlag(object,
value, // Used as scratch.
MemoryChunk::kPointersFromHereAreInterestingMask, zero, &done,
Label::kNear);
CallRecordWriteStub(object, address, remembered_set_action, fp_mode);
bind(&done);
// Clobber clobbered registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
Move(address, kZapValue, RelocInfo::NONE);
Move(value, kZapValue, RelocInfo::NONE);
}
}
void TurboAssembler::Assert(Condition cc, AbortReason reason) {
if (emit_debug_code()) Check(cc, reason);
}
void TurboAssembler::AssertUnreachable(AbortReason reason) {
if (emit_debug_code()) Abort(reason);
}
void TurboAssembler::Check(Condition cc, AbortReason reason) {
Label L;
j(cc, &L, Label::kNear);
Abort(reason);
// Control will not return here.
bind(&L);
}
void TurboAssembler::CheckStackAlignment() {
int frame_alignment = base::OS::ActivationFrameAlignment();
int frame_alignment_mask = frame_alignment - 1;
if (frame_alignment > kSystemPointerSize) {
DCHECK(base::bits::IsPowerOfTwo(frame_alignment));
Label alignment_as_expected;
testq(rsp, Immediate(frame_alignment_mask));
j(zero, &alignment_as_expected, Label::kNear);
// Abort if stack is not aligned.
int3();
bind(&alignment_as_expected);
}
}
void TurboAssembler::Abort(AbortReason reason) {
#ifdef DEBUG
const char* msg = GetAbortReason(reason);
RecordComment("Abort message: ");
RecordComment(msg);
#endif
// Avoid emitting call to builtin if requested.
if (trap_on_abort()) {
int3();
return;
}
if (should_abort_hard()) {
// We don't care if we constructed a frame. Just pretend we did.
FrameScope assume_frame(this, StackFrame::NONE);
movl(arg_reg_1, Immediate(static_cast<int>(reason)));
PrepareCallCFunction(1);
LoadAddress(rax, ExternalReference::abort_with_reason());
call(rax);
return;
}
Move(rdx, Smi::FromInt(static_cast<int>(reason)));
if (!has_frame()) {
// 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(this, StackFrame::NONE);
Call(BUILTIN_CODE(isolate(), Abort), RelocInfo::CODE_TARGET);
} else {
Call(BUILTIN_CODE(isolate(), Abort), RelocInfo::CODE_TARGET);
}
// Control will not return here.
int3();
}
void MacroAssembler::CallRuntime(const Runtime::Function* f, int num_arguments,
SaveFPRegsMode save_doubles) {
// If the expected number of arguments of the runtime function is
// constant, we check that the actual number of arguments match the
// expectation.
CHECK(f->nargs < 0 || f->nargs == num_arguments);
// TODO(1236192): Most runtime routines don't need the number of
// arguments passed in because it is constant. At some point we
// should remove this need and make the runtime routine entry code
// smarter.
Set(rax, num_arguments);
LoadAddress(rbx, ExternalReference::Create(f));
Handle<Code> code =
CodeFactory::CEntry(isolate(), f->result_size, save_doubles);
Call(code, RelocInfo::CODE_TARGET);
}
void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid) {
// ----------- S t a t e -------------
// -- rsp[0] : return address
// -- rsp[8] : argument num_arguments - 1
// ...
// -- rsp[8 * num_arguments] : argument 0 (receiver)
//
// For runtime functions with variable arguments:
// -- rax : number of arguments
// -----------------------------------
const Runtime::Function* function = Runtime::FunctionForId(fid);
DCHECK_EQ(1, function->result_size);
if (function->nargs >= 0) {
Set(rax, function->nargs);
}
JumpToExternalReference(ExternalReference::Create(fid));
}
void MacroAssembler::JumpToExternalReference(const ExternalReference& ext,
bool builtin_exit_frame) {
// Set the entry point and jump to the C entry runtime stub.
LoadAddress(rbx, ext);
Handle<Code> code = CodeFactory::CEntry(isolate(), 1, kDontSaveFPRegs,
kArgvOnStack, builtin_exit_frame);
Jump(code, RelocInfo::CODE_TARGET);
}
static constexpr Register saved_regs[] = {rax, rcx, rdx, rbx, rbp, rsi,
rdi, r8, r9, r10, r11};
static constexpr int kNumberOfSavedRegs = sizeof(saved_regs) / sizeof(Register);
int TurboAssembler::RequiredStackSizeForCallerSaved(SaveFPRegsMode fp_mode,
Register exclusion1,
Register exclusion2,
Register exclusion3) const {
int bytes = 0;
for (int i = 0; i < kNumberOfSavedRegs; i++) {
Register reg = saved_regs[i];
if (reg != exclusion1 && reg != exclusion2 && reg != exclusion3) {
bytes += kSystemPointerSize;
}
}
// R12 to r15 are callee save on all platforms.
if (fp_mode == kSaveFPRegs) {
bytes += kDoubleSize * XMMRegister::kNumRegisters;
}
return bytes;
}
int TurboAssembler::PushCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1,
Register exclusion2, Register exclusion3) {
// We don't allow a GC during a store buffer overflow so there is no need to
// store the registers in any particular way, but we do have to store and
// restore them.
int bytes = 0;
for (int i = 0; i < kNumberOfSavedRegs; i++) {
Register reg = saved_regs[i];
if (reg != exclusion1 && reg != exclusion2 && reg != exclusion3) {
pushq(reg);
bytes += kSystemPointerSize;
}
}
// R12 to r15 are callee save on all platforms.
if (fp_mode == kSaveFPRegs) {
int delta = kDoubleSize * XMMRegister::kNumRegisters;
AllocateStackSpace(delta);
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
Movsd(Operand(rsp, i * kDoubleSize), reg);
}
bytes += delta;
}
return bytes;
}
int TurboAssembler::PopCallerSaved(SaveFPRegsMode fp_mode, Register exclusion1,
Register exclusion2, Register exclusion3) {
int bytes = 0;
if (fp_mode == kSaveFPRegs) {
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
Movsd(reg, Operand(rsp, i * kDoubleSize));
}
int delta = kDoubleSize * XMMRegister::kNumRegisters;
addq(rsp, Immediate(kDoubleSize * XMMRegister::kNumRegisters));
bytes += delta;
}
for (int i = kNumberOfSavedRegs - 1; i >= 0; i--) {
Register reg = saved_regs[i];
if (reg != exclusion1 && reg != exclusion2 && reg != exclusion3) {
popq(reg);
bytes += kSystemPointerSize;
}
}
return bytes;
}
void TurboAssembler::Cvtss2sd(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtss2sd(dst, src, src);
} else {
cvtss2sd(dst, src);
}
}
void TurboAssembler::Cvtss2sd(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtss2sd(dst, dst, src);
} else {
cvtss2sd(dst, src);
}
}
void TurboAssembler::Cvtsd2ss(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtsd2ss(dst, src, src);
} else {
cvtsd2ss(dst, src);
}
}
void TurboAssembler::Cvtsd2ss(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtsd2ss(dst, dst, src);
} else {
cvtsd2ss(dst, src);
}
}
void TurboAssembler::Cvtlsi2sd(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtlsi2sd(dst, kScratchDoubleReg, src);
} else {
xorpd(dst, dst);
cvtlsi2sd(dst, src);
}
}
void TurboAssembler::Cvtlsi2sd(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtlsi2sd(dst, kScratchDoubleReg, src);
} else {
xorpd(dst, dst);
cvtlsi2sd(dst, src);
}
}
void TurboAssembler::Cvtlsi2ss(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtlsi2ss(dst, kScratchDoubleReg, src);
} else {
xorps(dst, dst);
cvtlsi2ss(dst, src);
}
}
void TurboAssembler::Cvtlsi2ss(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtlsi2ss(dst, kScratchDoubleReg, src);
} else {
xorps(dst, dst);
cvtlsi2ss(dst, src);
}
}
void TurboAssembler::Cvtqsi2ss(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtqsi2ss(dst, kScratchDoubleReg, src);
} else {
xorps(dst, dst);
cvtqsi2ss(dst, src);
}
}
void TurboAssembler::Cvtqsi2ss(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtqsi2ss(dst, kScratchDoubleReg, src);
} else {
xorps(dst, dst);
cvtqsi2ss(dst, src);
}
}
void TurboAssembler::Cvtqsi2sd(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtqsi2sd(dst, kScratchDoubleReg, src);
} else {
xorpd(dst, dst);
cvtqsi2sd(dst, src);
}
}
void TurboAssembler::Cvtqsi2sd(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvtqsi2sd(dst, kScratchDoubleReg, src);
} else {
xorpd(dst, dst);
cvtqsi2sd(dst, src);
}
}
void TurboAssembler::Cvtlui2ss(XMMRegister dst, Register src) {
// Zero-extend the 32 bit value to 64 bit.
movl(kScratchRegister, src);
Cvtqsi2ss(dst, kScratchRegister);
}
void TurboAssembler::Cvtlui2ss(XMMRegister dst, Operand src) {
// Zero-extend the 32 bit value to 64 bit.
movl(kScratchRegister, src);
Cvtqsi2ss(dst, kScratchRegister);
}
void TurboAssembler::Cvtlui2sd(XMMRegister dst, Register src) {
// Zero-extend the 32 bit value to 64 bit.
movl(kScratchRegister, src);
Cvtqsi2sd(dst, kScratchRegister);
}
void TurboAssembler::Cvtlui2sd(XMMRegister dst, Operand src) {
// Zero-extend the 32 bit value to 64 bit.
movl(kScratchRegister, src);
Cvtqsi2sd(dst, kScratchRegister);
}
void TurboAssembler::Cvtqui2ss(XMMRegister dst, Register src) {
Label done;
Cvtqsi2ss(dst, src);
testq(src, src);
j(positive, &done, Label::kNear);
// Compute {src/2 | (src&1)} (retain the LSB to avoid rounding errors).
if (src != kScratchRegister) movq(kScratchRegister, src);
shrq(kScratchRegister, Immediate(1));
// The LSB is shifted into CF. If it is set, set the LSB in {tmp}.
Label msb_not_set;
j(not_carry, &msb_not_set, Label::kNear);
orq(kScratchRegister, Immediate(1));
bind(&msb_not_set);
Cvtqsi2ss(dst, kScratchRegister);
Addss(dst, dst);
bind(&done);
}
void TurboAssembler::Cvtqui2ss(XMMRegister dst, Operand src) {
movq(kScratchRegister, src);
Cvtqui2ss(dst, kScratchRegister);
}
void TurboAssembler::Cvtqui2sd(XMMRegister dst, Register src) {
Label done;
Cvtqsi2sd(dst, src);
testq(src, src);
j(positive, &done, Label::kNear);
// Compute {src/2 | (src&1)} (retain the LSB to avoid rounding errors).
if (src != kScratchRegister) movq(kScratchRegister, src);
shrq(kScratchRegister, Immediate(1));
// The LSB is shifted into CF. If it is set, set the LSB in {tmp}.
Label msb_not_set;
j(not_carry, &msb_not_set, Label::kNear);
orq(kScratchRegister, Immediate(1));
bind(&msb_not_set);
Cvtqsi2sd(dst, kScratchRegister);
Addsd(dst, dst);
bind(&done);
}
void TurboAssembler::Cvtqui2sd(XMMRegister dst, Operand src) {
movq(kScratchRegister, src);
Cvtqui2sd(dst, kScratchRegister);
}
void TurboAssembler::Cvttss2si(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttss2si(dst, src);
} else {
cvttss2si(dst, src);
}
}
void TurboAssembler::Cvttss2si(Register dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttss2si(dst, src);
} else {
cvttss2si(dst, src);
}
}
void TurboAssembler::Cvttsd2si(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttsd2si(dst, src);
} else {
cvttsd2si(dst, src);
}
}
void TurboAssembler::Cvttsd2si(Register dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttsd2si(dst, src);
} else {
cvttsd2si(dst, src);
}
}
void TurboAssembler::Cvttss2siq(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttss2siq(dst, src);
} else {
cvttss2siq(dst, src);
}
}
void TurboAssembler::Cvttss2siq(Register dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttss2siq(dst, src);
} else {
cvttss2siq(dst, src);
}
}
void TurboAssembler::Cvttsd2siq(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttsd2siq(dst, src);
} else {
cvttsd2siq(dst, src);
}
}
void TurboAssembler::Cvttsd2siq(Register dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttsd2siq(dst, src);
} else {
cvttsd2siq(dst, src);
}
}
namespace {
template <typename OperandOrXMMRegister, bool is_double>
void ConvertFloatToUint64(TurboAssembler* tasm, Register dst,
OperandOrXMMRegister src, Label* fail) {
Label success;
// There does not exist a native float-to-uint instruction, so we have to use
// a float-to-int, and postprocess the result.
if (is_double) {
tasm->Cvttsd2siq(dst, src);
} else {
tasm->Cvttss2siq(dst, src);
}
// If the result of the conversion is positive, we are already done.
tasm->testq(dst, dst);
tasm->j(positive, &success);
// The result of the first conversion was negative, which means that the
// input value was not within the positive int64 range. We subtract 2^63
// and convert it again to see if it is within the uint64 range.
if (is_double) {
tasm->Move(kScratchDoubleReg, -9223372036854775808.0);
tasm->Addsd(kScratchDoubleReg, src);
tasm->Cvttsd2siq(dst, kScratchDoubleReg);
} else {
tasm->Move(kScratchDoubleReg, -9223372036854775808.0f);
tasm->Addss(kScratchDoubleReg, src);
tasm->Cvttss2siq(dst, kScratchDoubleReg);
}
tasm->testq(dst, dst);
// The only possible negative value here is 0x80000000000000000, which is
// used on x64 to indicate an integer overflow.
tasm->j(negative, fail ? fail : &success);
// The input value is within uint64 range and the second conversion worked
// successfully, but we still have to undo the subtraction we did
// earlier.
tasm->Set(kScratchRegister, 0x8000000000000000);
tasm->orq(dst, kScratchRegister);
tasm->bind(&success);
}
} // namespace
void TurboAssembler::Cvttsd2uiq(Register dst, Operand src, Label* fail) {
ConvertFloatToUint64<Operand, true>(this, dst, src, fail);
}
void TurboAssembler::Cvttsd2uiq(Register dst, XMMRegister src, Label* fail) {
ConvertFloatToUint64<XMMRegister, true>(this, dst, src, fail);
}
void TurboAssembler::Cvttss2uiq(Register dst, Operand src, Label* fail) {
ConvertFloatToUint64<Operand, false>(this, dst, src, fail);
}
void TurboAssembler::Cvttss2uiq(Register dst, XMMRegister src, Label* fail) {
ConvertFloatToUint64<XMMRegister, false>(this, dst, src, fail);
}
void TurboAssembler::Set(Register dst, int64_t x) {
if (x == 0) {
xorl(dst, dst);
} else if (is_uint32(x)) {
movl(dst, Immediate(static_cast<uint32_t>(x)));
} else if (is_int32(x)) {
movq(dst, Immediate(static_cast<int32_t>(x)));
} else {
movq(dst, x);
}
}
void TurboAssembler::Set(Operand dst, intptr_t x) {
if (is_int32(x)) {
movq(dst, Immediate(static_cast<int32_t>(x)));
} else {
Set(kScratchRegister, x);
movq(dst, kScratchRegister);
}
}
// ----------------------------------------------------------------------------
// Smi tagging, untagging and tag detection.
Register TurboAssembler::GetSmiConstant(Smi source) {
STATIC_ASSERT(kSmiTag == 0);
int value = source.value();
if (value == 0) {
xorl(kScratchRegister, kScratchRegister);
return kScratchRegister;
}
if (SmiValuesAre32Bits()) {
Move(kScratchRegister, source);
} else {
movl(kScratchRegister, Immediate(source));
}
return kScratchRegister;
}
void TurboAssembler::Move(Register dst, Smi source) {
STATIC_ASSERT(kSmiTag == 0);
int value = source.value();
if (value == 0) {
xorl(dst, dst);
} else {
Move(dst, source.ptr(), RelocInfo::NONE);
}
}
void TurboAssembler::Move(Register dst, ExternalReference ext) {
// TODO(jgruber,v8:8887): Also consider a root-relative load when generating
// non-isolate-independent code. In many cases it might be cheaper than
// embedding the relocatable value.
if (root_array_available_ && options().isolate_independent_code) {
IndirectLoadExternalReference(dst, ext);
return;
}
movq(dst, Immediate64(ext.address(), RelocInfo::EXTERNAL_REFERENCE));
}
void MacroAssembler::Cmp(Register dst, int32_t src) {
if (src == 0) {
testl(dst, dst);
} else {
cmpl(dst, Immediate(src));
}
}
void MacroAssembler::SmiTag(Register reg) {
STATIC_ASSERT(kSmiTag == 0);
DCHECK(SmiValuesAre32Bits() || SmiValuesAre31Bits());
if (COMPRESS_POINTERS_BOOL) {
shll(reg, Immediate(kSmiShift));
} else {
shlq(reg, Immediate(kSmiShift));
}
}
void MacroAssembler::SmiTag(Register dst, Register src) {
DCHECK(dst != src);
if (COMPRESS_POINTERS_BOOL) {
movl(dst, src);
} else {
movq(dst, src);
}
SmiTag(dst);
}
void TurboAssembler::SmiUntag(Register reg) {
STATIC_ASSERT(kSmiTag == 0);
DCHECK(SmiValuesAre32Bits() || SmiValuesAre31Bits());
// TODO(v8:7703): Is there a way to avoid this sign extension when pointer
// compression is enabled?
if (COMPRESS_POINTERS_BOOL) {
movsxlq(reg, reg);
}
sarq(reg, Immediate(kSmiShift));
}
void TurboAssembler::SmiUntag(Register dst, Register src) {
DCHECK(dst != src);
if (COMPRESS_POINTERS_BOOL) {
movsxlq(dst, src);
} else {
movq(dst, src);
}
// TODO(v8:7703): Call SmiUntag(reg) if we can find a way to avoid the extra
// mov when pointer compression is enabled.
STATIC_ASSERT(kSmiTag == 0);
DCHECK(SmiValuesAre32Bits() || SmiValuesAre31Bits());
sarq(dst, Immediate(kSmiShift));
}
void TurboAssembler::SmiUntag(Register dst, Operand src) {
if (SmiValuesAre32Bits()) {
movl(dst, Operand(src, kSmiShift / kBitsPerByte));
// Sign extend to 64-bit.
movsxlq(dst, dst);
} else {
DCHECK(SmiValuesAre31Bits());
if (COMPRESS_POINTERS_BOOL) {
movsxlq(dst, src);
} else {
movq(dst, src);
}
sarq(dst, Immediate(kSmiShift));
}
}
void MacroAssembler::SmiCompare(Register smi1, Register smi2) {
AssertSmi(smi1);
AssertSmi(smi2);
cmp_tagged(smi1, smi2);
}
void MacroAssembler::SmiCompare(Register dst, Smi src) {
AssertSmi(dst);
Cmp(dst, src);
}
void MacroAssembler::Cmp(Register dst, Smi src) {
if (src.value() == 0) {
test_tagged(dst, dst);
} else {
DCHECK_NE(dst, kScratchRegister);
Register constant_reg = GetSmiConstant(src);
cmp_tagged(dst, constant_reg);
}
}
void MacroAssembler::SmiCompare(Register dst, Operand src) {
AssertSmi(dst);
AssertSmi(src);
cmp_tagged(dst, src);
}
void MacroAssembler::SmiCompare(Operand dst, Register src) {
AssertSmi(dst);
AssertSmi(src);
cmp_tagged(dst, src);
}
void MacroAssembler::SmiCompare(Operand dst, Smi src) {
AssertSmi(dst);
if (SmiValuesAre32Bits()) {
cmpl(Operand(dst, kSmiShift / kBitsPerByte), Immediate(src.value()));
} else {
DCHECK(SmiValuesAre31Bits());
cmpl(dst, Immediate(src));
}
}
void MacroAssembler::Cmp(Operand dst, Smi src) {
// The Operand cannot use the smi register.
Register smi_reg = GetSmiConstant(src);
DCHECK(!dst.AddressUsesRegister(smi_reg));
cmp_tagged(dst, smi_reg);
}
Condition TurboAssembler::CheckSmi(Register src) {
STATIC_ASSERT(kSmiTag == 0);
testb(src, Immediate(kSmiTagMask));
return zero;
}
Condition TurboAssembler::CheckSmi(Operand src) {
STATIC_ASSERT(kSmiTag == 0);
testb(src, Immediate(kSmiTagMask));
return zero;
}
void TurboAssembler::JumpIfSmi(Register src, Label* on_smi,
Label::Distance near_jump) {
Condition smi = CheckSmi(src);
j(smi, on_smi, near_jump);
}
void MacroAssembler::JumpIfNotSmi(Register src, Label* on_not_smi,
Label::Distance near_jump) {
Condition smi = CheckSmi(src);
j(NegateCondition(smi), on_not_smi, near_jump);
}
void MacroAssembler::JumpIfNotSmi(Operand src, Label* on_not_smi,
Label::Distance near_jump) {
Condition smi = CheckSmi(src);
j(NegateCondition(smi), on_not_smi, near_jump);
}
void MacroAssembler::SmiAddConstant(Operand dst, Smi constant) {
if (constant.value() != 0) {
if (SmiValuesAre32Bits()) {
addl(Operand(dst, kSmiShift / kBitsPerByte), Immediate(constant.value()));
} else {
DCHECK(SmiValuesAre31Bits());
if (kTaggedSize == kInt64Size) {
// Sign-extend value after addition
movl(kScratchRegister, dst);
addl(kScratchRegister, Immediate(constant));
movsxlq(kScratchRegister, kScratchRegister);
movq(dst, kScratchRegister);
} else {
DCHECK_EQ(kTaggedSize, kInt32Size);
addl(dst, Immediate(constant));
}
}
}
}
SmiIndex MacroAssembler::SmiToIndex(Register dst, Register src, int shift) {
if (SmiValuesAre32Bits()) {
DCHECK(is_uint6(shift));
// There is a possible optimization if shift is in the range 60-63, but that
// will (and must) never happen.
if (dst != src) {
movq(dst, src);
}
if (shift < kSmiShift) {
sarq(dst, Immediate(kSmiShift - shift));
} else {
shlq(dst, Immediate(shift - kSmiShift));
}
return SmiIndex(dst, times_1);
} else {
DCHECK(SmiValuesAre31Bits());
// We have to sign extend the index register to 64-bit as the SMI might
// be negative.
movsxlq(dst, src);
if (shift < kSmiShift) {
sarq(dst, Immediate(kSmiShift - shift));
} else if (shift != kSmiShift) {
if (shift - kSmiShift <= static_cast<int>(times_8)) {
return SmiIndex(dst, static_cast<ScaleFactor>(shift - kSmiShift));
}
shlq(dst, Immediate(shift - kSmiShift));
}
return SmiIndex(dst, times_1);
}
}
void TurboAssembler::Push(Smi source) {
intptr_t smi = static_cast<intptr_t>(source.ptr());
if (is_int32(smi)) {
Push(Immediate(static_cast<int32_t>(smi)));
return;
}
int first_byte_set = base::bits::CountTrailingZeros64(smi) / 8;
int last_byte_set = (63 - base::bits::CountLeadingZeros64(smi)) / 8;
if (first_byte_set == last_byte_set) {
// This sequence has only 7 bytes, compared to the 12 bytes below.
Push(Immediate(0));
movb(Operand(rsp, first_byte_set),
Immediate(static_cast<int8_t>(smi >> (8 * first_byte_set))));
return;
}
Register constant = GetSmiConstant(source);
Push(constant);
}
// ----------------------------------------------------------------------------
void TurboAssembler::Move(Register dst, Register src) {
if (dst != src) {
movq(dst, src);
}
}
void TurboAssembler::MovePair(Register dst0, Register src0, Register dst1,
Register src1) {
if (dst0 != src1) {
// Normal case: Writing to dst0 does not destroy src1.
Move(dst0, src0);
Move(dst1, src1);
} else if (dst1 != src0) {
// Only dst0 and src1 are the same register,
// but writing to dst1 does not destroy src0.
Move(dst1, src1);
Move(dst0, src0);
} else {
// dst0 == src1, and dst1 == src0, a swap is required:
// dst0 \/ src0
// dst1 /\ src1
xchgq(dst0, dst1);
}
}
void TurboAssembler::MoveNumber(Register dst, double value) {
int32_t smi;
if (DoubleToSmiInteger(value, &smi)) {
Move(dst, Smi::FromInt(smi));
} else {
movq_heap_number(dst, value);
}
}
void TurboAssembler::Move(XMMRegister dst, uint32_t src) {
if (src == 0) {
Xorps(dst, dst);
} else {
unsigned nlz = base::bits::CountLeadingZeros(src);
unsigned ntz = base::bits::CountTrailingZeros(src);
unsigned pop = base::bits::CountPopulation(src);
DCHECK_NE(0u, pop);
if (pop + ntz + nlz == 32) {
Pcmpeqd(dst, dst);
if (ntz) Pslld(dst, static_cast<byte>(ntz + nlz));
if (nlz) Psrld(dst, static_cast<byte>(nlz));
} else {
movl(kScratchRegister, Immediate(src));
Movd(dst, kScratchRegister);
}
}
}
void TurboAssembler::Move(XMMRegister dst, uint64_t src) {
if (src == 0) {
Xorpd(dst, dst);
} else {
unsigned nlz = base::bits::CountLeadingZeros(src);
unsigned ntz = base::bits::CountTrailingZeros(src);
unsigned pop = base::bits::CountPopulation(src);
DCHECK_NE(0u, pop);
if (pop + ntz + nlz == 64) {
Pcmpeqd(dst, dst);
if (ntz) Psllq(dst, static_cast<byte>(ntz + nlz));
if (nlz) Psrlq(dst, static_cast<byte>(nlz));
} else {
uint32_t lower = static_cast<uint32_t>(src);
uint32_t upper = static_cast<uint32_t>(src >> 32);
if (upper == 0) {
Move(dst, lower);
} else {
movq(kScratchRegister, src);
Movq(dst, kScratchRegister);
}
}
}
}
void TurboAssembler::Move(XMMRegister dst, uint64_t high, uint64_t low) {
Move(dst, low);
movq(kScratchRegister, high);
Pinsrq(dst, kScratchRegister, uint8_t{1});
}
// ----------------------------------------------------------------------------
void MacroAssembler::Absps(XMMRegister dst) {
Andps(dst, ExternalReferenceAsOperand(
ExternalReference::address_of_float_abs_constant()));
}
void MacroAssembler::Negps(XMMRegister dst) {
Xorps(dst, ExternalReferenceAsOperand(
ExternalReference::address_of_float_neg_constant()));
}
void MacroAssembler::Abspd(XMMRegister dst) {
Andps(dst, ExternalReferenceAsOperand(
ExternalReference::address_of_double_abs_constant()));
}
void MacroAssembler::Negpd(XMMRegister dst) {
Xorps(dst, ExternalReferenceAsOperand(
ExternalReference::address_of_double_neg_constant()));
}
void MacroAssembler::Cmp(Register dst, Handle<Object> source) {
if (source->IsSmi()) {
Cmp(dst, Smi::cast(*source));
} else {
Move(kScratchRegister, Handle<HeapObject>::cast(source));
cmp_tagged(dst, kScratchRegister);
}
}
void MacroAssembler::Cmp(Operand dst, Handle<Object> source) {
if (source->IsSmi()) {
Cmp(dst, Smi::cast(*source));
} else {
Move(kScratchRegister, Handle<HeapObject>::cast(source));
cmp_tagged(dst, kScratchRegister);
}
}
void MacroAssembler::JumpIfIsInRange(Register value, unsigned lower_limit,
unsigned higher_limit, Label* on_in_range,
Label::Distance near_jump) {
if (lower_limit != 0) {
leal(kScratchRegister, Operand(value, 0u - lower_limit));
cmpl(kScratchRegister, Immediate(higher_limit - lower_limit));
} else {
cmpl(value, Immediate(higher_limit));
}
j(below_equal, on_in_range, near_jump);
}
void TurboAssembler::Push(Handle<HeapObject> source) {
Move(kScratchRegister, source);
Push(kScratchRegister);
}
void TurboAssembler::PushArray(Register array, Register size, Register scratch,
PushArrayOrder order) {
DCHECK(!AreAliased(array, size, scratch));
Register counter = scratch;
Label loop, entry;
if (order == PushArrayOrder::kReverse) {
Set(counter, 0);
jmp(&entry);
bind(&loop);
Push(Operand(array, counter, times_system_pointer_size, 0));
incq(counter);
bind(&entry);
cmpq(counter, size);
j(less, &loop, Label::kNear);
} else {
movq(counter, size);
jmp(&entry);
bind(&loop);
Push(Operand(array, counter, times_system_pointer_size, 0));
bind(&entry);
decq(counter);
j(greater_equal, &loop, Label::kNear);
}
}
void TurboAssembler::Move(Register result, Handle<HeapObject> object,
RelocInfo::Mode rmode) {
// TODO(jgruber,v8:8887): Also consider a root-relative load when generating
// non-isolate-independent code. In many cases it might be cheaper than
// embedding the relocatable value.
if (root_array_available_ && options().isolate_independent_code) {
// TODO(v8:9706): Fix-it! This load will always uncompress the value
// even when we are loading a compressed embedded object.
IndirectLoadConstant(result, object);
} else if (RelocInfo::IsCompressedEmbeddedObject(rmode)) {
EmbeddedObjectIndex index = AddEmbeddedObject(object);
DCHECK(is_uint32(index));
movl(result, Immediate(static_cast<int>(index), rmode));
} else {
DCHECK(RelocInfo::IsFullEmbeddedObject(rmode));
movq(result, Immediate64(object.address(), rmode));
}
}
void TurboAssembler::Move(Operand dst, Handle<HeapObject> object,
RelocInfo::Mode rmode) {
Move(kScratchRegister, object, rmode);
movq(dst, kScratchRegister);
}
void TurboAssembler::MoveStringConstant(Register result,
const StringConstantBase* string,
RelocInfo::Mode rmode) {
movq_string(result, string);
}
void MacroAssembler::Drop(int stack_elements) {
if (stack_elements > 0) {
addq(rsp, Immediate(stack_elements * kSystemPointerSize));
}
}
void MacroAssembler::DropUnderReturnAddress(int stack_elements,
Register scratch) {
DCHECK_GT(stack_elements, 0);
if (stack_elements == 1) {
popq(MemOperand(rsp, 0));
return;
}
PopReturnAddressTo(scratch);
Drop(stack_elements);
PushReturnAddressFrom(scratch);
}
void TurboAssembler::Push(Register src) { pushq(src); }
void TurboAssembler::Push(Operand src) { pushq(src); }
void MacroAssembler::PushQuad(Operand src) { pushq(src); }
void TurboAssembler::Push(Immediate value) { pushq(value); }
void MacroAssembler::PushImm32(int32_t imm32) { pushq_imm32(imm32); }
void MacroAssembler::Pop(Register dst) { popq(dst); }
void MacroAssembler::Pop(Operand dst) { popq(dst); }
void MacroAssembler::PopQuad(Operand dst) { popq(dst); }
void TurboAssembler::Jump(const ExternalReference& reference) {
DCHECK(root_array_available());
jmp(Operand(kRootRegister, RootRegisterOffsetForExternalReferenceTableEntry(
isolate(), reference)));
}
void TurboAssembler::Jump(Operand op) { jmp(op); }
void TurboAssembler::Jump(Address destination, RelocInfo::Mode rmode) {
Move(kScratchRegister, destination, rmode);
jmp(kScratchRegister);
}
void TurboAssembler::Jump(Handle<Code> code_object, RelocInfo::Mode rmode,
Condition cc) {
DCHECK_IMPLIES(options().isolate_independent_code,
Builtins::IsIsolateIndependentBuiltin(*code_object));
if (options().inline_offheap_trampolines) {
int builtin_index = Builtins::kNoBuiltinId;
if (isolate()->builtins()->IsBuiltinHandle(code_object, &builtin_index)) {
Label skip;
if (cc != always) {
if (cc == never) return;
j(NegateCondition(cc), &skip, Label::kNear);
}
// Inline the trampoline.
RecordCommentForOffHeapTrampoline(builtin_index);
CHECK_NE(builtin_index, Builtins::kNoBuiltinId);
EmbeddedData d = EmbeddedData::FromBlob();
Address entry = d.InstructionStartOfBuiltin(builtin_index);
Move(kScratchRegister, entry, RelocInfo::OFF_HEAP_TARGET);
jmp(kScratchRegister);
bind(&skip);
return;
}
}
j(cc, code_object, rmode);
}
void MacroAssembler::JumpToInstructionStream(Address entry) {
Move(kOffHeapTrampolineRegister, entry, RelocInfo::OFF_HEAP_TARGET);
jmp(kOffHeapTrampolineRegister);
}
void TurboAssembler::Call(ExternalReference ext) {
LoadAddress(kScratchRegister, ext);
call(kScratchRegister);
}
void TurboAssembler::Call(Operand op) {
if (!CpuFeatures::IsSupported(ATOM)) {
call(op);
} else {
movq(kScratchRegister, op);
call(kScratchRegister);
}
}
void TurboAssembler::Call(Address destination, RelocInfo::Mode rmode) {
Move(kScratchRegister, destination, rmode);
call(kScratchRegister);
}
void TurboAssembler::Call(Handle<Code> code_object, RelocInfo::Mode rmode) {
DCHECK_IMPLIES(options().isolate_independent_code,
Builtins::IsIsolateIndependentBuiltin(*code_object));
if (options().inline_offheap_trampolines) {
int builtin_index = Builtins::kNoBuiltinId;
if (isolate()->builtins()->IsBuiltinHandle(code_object, &builtin_index)) {
// Inline the trampoline.
CallBuiltin(builtin_index);
return;
}
}
DCHECK(RelocInfo::IsCodeTarget(rmode));
call(code_object, rmode);
}
Operand TurboAssembler::EntryFromBuiltinIndexAsOperand(
Builtins::Name builtin_index) {
DCHECK(root_array_available());
return Operand(kRootRegister,
IsolateData::builtin_entry_slot_offset(builtin_index));
}
Operand TurboAssembler::EntryFromBuiltinIndexAsOperand(Register builtin_index) {
if (SmiValuesAre32Bits()) {
// The builtin_index register contains the builtin index as a Smi.
SmiUntag(builtin_index);
return Operand(kRootRegister, builtin_index, times_system_pointer_size,
IsolateData::builtin_entry_table_offset());
} else {
DCHECK(SmiValuesAre31Bits());
// The builtin_index register contains the builtin index as a Smi.
// Untagging is folded into the indexing operand below (we use
// times_half_system_pointer_size since smis are already shifted by one).
return Operand(kRootRegister, builtin_index, times_half_system_pointer_size,
IsolateData::builtin_entry_table_offset());
}
}
void TurboAssembler::CallBuiltinByIndex(Register builtin_index) {
Call(EntryFromBuiltinIndexAsOperand(builtin_index));
}
void TurboAssembler::CallBuiltin(int builtin_index) {
DCHECK(Builtins::IsBuiltinId(builtin_index));
RecordCommentForOffHeapTrampoline(builtin_index);
CHECK_NE(builtin_index, Builtins::kNoBuiltinId);
EmbeddedData d = EmbeddedData::FromBlob();
Address entry = d.InstructionStartOfBuiltin(builtin_index);
Move(kScratchRegister, entry, RelocInfo::OFF_HEAP_TARGET);
call(kScratchRegister);
}
void TurboAssembler::LoadCodeObjectEntry(Register destination,
Register code_object) {
// Code objects are called differently depending on whether we are generating
// builtin code (which will later be embedded into the binary) or compiling
// user JS code at runtime.
// * Builtin code runs in --jitless mode and thus must not call into on-heap
// Code targets. Instead, we dispatch through the builtins entry table.
// * Codegen at runtime does not have this restriction and we can use the
// shorter, branchless instruction sequence. The assumption here is that
// targets are usually generated code and not builtin Code objects.
if (options().isolate_independent_code) {
DCHECK(root_array_available());
Label if_code_is_off_heap, out;
// Check whether the Code object is an off-heap trampoline. If so, call its
// (off-heap) entry point directly without going through the (on-heap)
// trampoline. Otherwise, just call the Code object as always.
testl(FieldOperand(code_object, Code::kFlagsOffset),
Immediate(Code::IsOffHeapTrampoline::kMask));
j(not_equal, &if_code_is_off_heap);
// Not an off-heap trampoline, the entry point is at
// Code::raw_instruction_start().
Move(destination, code_object);
addq(destination, Immediate(Code::kHeaderSize - kHeapObjectTag));
jmp(&out);
// An off-heap trampoline, the entry point is loaded from the builtin entry
// table.
bind(&if_code_is_off_heap);
movl(destination, FieldOperand(code_object, Code::kBuiltinIndexOffset));
movq(destination,
Operand(kRootRegister, destination, times_system_pointer_size,
IsolateData::builtin_entry_table_offset()));
bind(&out);
} else {
Move(destination, code_object);
addq(destination, Immediate(Code::kHeaderSize - kHeapObjectTag));
}
}
void TurboAssembler::CallCodeObject(Register code_object) {
LoadCodeObjectEntry(code_object, code_object);
call(code_object);
}
void TurboAssembler::JumpCodeObject(Register code_object) {
LoadCodeObjectEntry(code_object, code_object);
jmp(code_object);
}
void TurboAssembler::RetpolineCall(Register reg) {
Label setup_return, setup_target, inner_indirect_branch, capture_spec;
jmp(&setup_return); // Jump past the entire retpoline below.
bind(&inner_indirect_branch);
call(&setup_target);
bind(&capture_spec);
pause();
jmp(&capture_spec);
bind(&setup_target);
movq(Operand(rsp, 0), reg);
ret(0);
bind(&setup_return);
call(&inner_indirect_branch); // Callee will return after this instruction.
}
void TurboAssembler::RetpolineCall(Address destination, RelocInfo::Mode rmode) {
Move(kScratchRegister, destination, rmode);
RetpolineCall(kScratchRegister);
}
void TurboAssembler::RetpolineJump(Register reg) {
Label setup_target, capture_spec;
call(&setup_target);
bind(&capture_spec);
pause();
jmp(&capture_spec);
bind(&setup_target);
movq(Operand(rsp, 0), reg);
ret(0);
}
void TurboAssembler::Shufps(XMMRegister dst, XMMRegister src, byte imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope avx_scope(this, AVX);
vshufps(dst, src, src, imm8);
} else {
if (dst != src) {
movss(dst, src);
}
shufps(dst, src, static_cast<byte>(0));
}
}
void TurboAssembler::Pextrd(Register dst, XMMRegister src, uint8_t imm8) {
if (imm8 == 0) {
Movd(dst, src);
return;
}
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpextrd(dst, src, imm8);
return;
} else if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pextrd(dst, src, imm8);
return;
}
DCHECK_EQ(1, imm8);
movq(dst, src);
shrq(dst, Immediate(32));
}
namespace {
template <typename Src>
using AvxFn = void (Assembler::*)(XMMRegister, XMMRegister, Src, uint8_t);
template <typename Src>
using NoAvxFn = void (Assembler::*)(XMMRegister, Src, uint8_t);
template <typename Src>
void PinsrHelper(Assembler* assm, AvxFn<Src> avx, NoAvxFn<Src> noavx,
XMMRegister dst, XMMRegister src1, Src src2, uint8_t imm8,
base::Optional<CpuFeature> feature = base::nullopt) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(assm, AVX);
(assm->*avx)(dst, src1, src2, imm8);
return;
}
if (dst != src1) {
assm->movdqu(dst, src1);
}
if (feature.has_value()) {
DCHECK(CpuFeatures::IsSupported(*feature));
CpuFeatureScope scope(assm, *feature);
(assm->*noavx)(dst, src2, imm8);
} else {
(assm->*noavx)(dst, src2, imm8);
}
}
} // namespace
void TurboAssembler::Pinsrb(XMMRegister dst, XMMRegister src1, Register src2,
uint8_t imm8) {
PinsrHelper(this, &Assembler::vpinsrb, &Assembler::pinsrb, dst, src1, src2,
imm8, base::Optional<CpuFeature>(SSE4_1));
}
void TurboAssembler::Pinsrb(XMMRegister dst, XMMRegister src1, Operand src2,
uint8_t imm8) {
PinsrHelper(this, &Assembler::vpinsrb, &Assembler::pinsrb, dst, src1, src2,
imm8, base::Optional<CpuFeature>(SSE4_1));
}
void TurboAssembler::Pinsrw(XMMRegister dst, XMMRegister src1, Register src2,
uint8_t imm8) {
PinsrHelper(this, &Assembler::vpinsrw, &Assembler::pinsrw, dst, src1, src2,
imm8);
}
void TurboAssembler::Pinsrw(XMMRegister dst, XMMRegister src1, Operand src2,
uint8_t imm8) {
PinsrHelper(this, &Assembler::vpinsrw, &Assembler::pinsrw, dst, src1, src2,
imm8);
}
void TurboAssembler::Pinsrd(XMMRegister dst, XMMRegister src1, Register src2,
uint8_t imm8) {
// Need a fall back when SSE4_1 is unavailable. Pinsrb and Pinsrq are used
// only by Wasm SIMD, which requires SSE4_1 already.
if (CpuFeatures::IsSupported(SSE4_1)) {
PinsrHelper(this, &Assembler::vpinsrd, &Assembler::pinsrd, dst, src1, src2,
imm8, base::Optional<CpuFeature>(SSE4_1));
return;
}
Movd(kScratchDoubleReg, src2);
if (imm8 == 1) {
punpckldq(dst, kScratchDoubleReg);
} else {
DCHECK_EQ(0, imm8);
Movss(dst, kScratchDoubleReg);
}
}
void TurboAssembler::Pinsrd(XMMRegister dst, XMMRegister src1, Operand src2,
uint8_t imm8) {
// Need a fall back when SSE4_1 is unavailable. Pinsrb and Pinsrq are used
// only by Wasm SIMD, which requires SSE4_1 already.
if (CpuFeatures::IsSupported(SSE4_1)) {
PinsrHelper(this, &Assembler::vpinsrd, &Assembler::pinsrd, dst, src1, src2,
imm8, base::Optional<CpuFeature>(SSE4_1));
return;
}
Movd(kScratchDoubleReg, src2);
if (imm8 == 1) {
punpckldq(dst, kScratchDoubleReg);
} else {
DCHECK_EQ(0, imm8);
Movss(dst, kScratchDoubleReg);
}
}
void TurboAssembler::Pinsrd(XMMRegister dst, Register src2, uint8_t imm8) {
Pinsrd(dst, dst, src2, imm8);
}
void TurboAssembler::Pinsrd(XMMRegister dst, Operand src2, uint8_t imm8) {
Pinsrd(dst, dst, src2, imm8);
}
void TurboAssembler::Pinsrq(XMMRegister dst, XMMRegister src1, Register src2,
uint8_t imm8) {
PinsrHelper(this, &Assembler::vpinsrq, &Assembler::pinsrq, dst, src1, src2,
imm8, base::Optional<CpuFeature>(SSE4_1));
}
void TurboAssembler::Pinsrq(XMMRegister dst, XMMRegister src1, Operand src2,
uint8_t imm8) {
PinsrHelper(this, &Assembler::vpinsrq, &Assembler::pinsrq, dst, src1, src2,
imm8, base::Optional<CpuFeature>(SSE4_1));
}
void TurboAssembler::Psllq(XMMRegister dst, byte imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsllq(dst, dst, imm8);
} else {
DCHECK(!IsEnabled(AVX));
psllq(dst, imm8);
}
}
void TurboAssembler::Psrlq(XMMRegister dst, byte imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsrlq(dst, dst, imm8);
} else {
DCHECK(!IsEnabled(AVX));
psrlq(dst, imm8);
}
}
void TurboAssembler::Pslld(XMMRegister dst, byte imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpslld(dst, dst, imm8);
} else {
DCHECK(!IsEnabled(AVX));
pslld(dst, imm8);
}
}
void TurboAssembler::Pblendvb(XMMRegister dst, XMMRegister src1,
XMMRegister src2, XMMRegister mask) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope avx_scope(this, AVX);
vpblendvb(dst, src1, src2, mask);
} else {
DCHECK_EQ(dst, src1);
DCHECK_EQ(xmm0, mask);
pblendvb(dst, src2);
}
}
void TurboAssembler::Blendvps(XMMRegister dst, XMMRegister src1,
XMMRegister src2, XMMRegister mask) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope avx_scope(this, AVX);
vblendvps(dst, src1, src2, mask);
} else {
DCHECK_EQ(dst, src1);
DCHECK_EQ(xmm0, mask);
blendvps(dst, src2);
}
}
void TurboAssembler::Blendvpd(XMMRegister dst, XMMRegister src1,
XMMRegister src2, XMMRegister mask) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope avx_scope(this, AVX);
vblendvpd(dst, src1, src2, mask);
} else {
DCHECK_EQ(dst, src1);
DCHECK_EQ(xmm0, mask);
blendvpd(dst, src2);
}
}
void TurboAssembler::Pshufb(XMMRegister dst, XMMRegister src,
XMMRegister mask) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope avx_scope(this, AVX);
vpshufb(dst, src, mask);
} else {
// Make sure these are different so that we won't overwrite mask.
DCHECK_NE(dst, mask);
if (dst != src) {
movapd(dst, src);
}
CpuFeatureScope sse_scope(this, SSSE3);
pshufb(dst, mask);
}
}
void TurboAssembler::Psrld(XMMRegister dst, byte imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsrld(dst, dst, imm8);
} else {
DCHECK(!IsEnabled(AVX));
psrld(dst, imm8);
}
}
void TurboAssembler::Lzcntl(Register dst, Register src) {
if (CpuFeatures::IsSupported(LZCNT)) {
CpuFeatureScope scope(this, LZCNT);
lzcntl(dst, src);
return;
}
Label not_zero_src;
bsrl(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
movl(dst, Immediate(63)); // 63^31 == 32
bind(&not_zero_src);
xorl(dst, Immediate(31)); // for x in [0..31], 31^x == 31 - x
}
void TurboAssembler::Lzcntl(Register dst, Operand src) {
if (CpuFeatures::IsSupported(LZCNT)) {
CpuFeatureScope scope(this, LZCNT);
lzcntl(dst, src);
return;
}
Label not_zero_src;
bsrl(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
movl(dst, Immediate(63)); // 63^31 == 32
bind(&not_zero_src);
xorl(dst, Immediate(31)); // for x in [0..31], 31^x == 31 - x
}
void TurboAssembler::Lzcntq(Register dst, Register src) {
if (CpuFeatures::IsSupported(LZCNT)) {
CpuFeatureScope scope(this, LZCNT);
lzcntq(dst, src);
return;
}
Label not_zero_src;
bsrq(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
movl(dst, Immediate(127)); // 127^63 == 64
bind(&not_zero_src);
xorl(dst, Immediate(63)); // for x in [0..63], 63^x == 63 - x
}
void TurboAssembler::Lzcntq(Register dst, Operand src) {
if (CpuFeatures::IsSupported(LZCNT)) {
CpuFeatureScope scope(this, LZCNT);
lzcntq(dst, src);
return;
}
Label not_zero_src;
bsrq(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
movl(dst, Immediate(127)); // 127^63 == 64
bind(&not_zero_src);
xorl(dst, Immediate(63)); // for x in [0..63], 63^x == 63 - x
}
void TurboAssembler::Tzcntq(Register dst, Register src) {
if (CpuFeatures::IsSupported(BMI1)) {
CpuFeatureScope scope(this, BMI1);
tzcntq(dst, src);
return;
}
Label not_zero_src;
bsfq(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
// Define the result of tzcnt(0) separately, because bsf(0) is undefined.
movl(dst, Immediate(64));
bind(&not_zero_src);
}
void TurboAssembler::Tzcntq(Register dst, Operand src) {
if (CpuFeatures::IsSupported(BMI1)) {
CpuFeatureScope scope(this, BMI1);
tzcntq(dst, src);
return;
}
Label not_zero_src;
bsfq(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
// Define the result of tzcnt(0) separately, because bsf(0) is undefined.
movl(dst, Immediate(64));
bind(&not_zero_src);
}
void TurboAssembler::Tzcntl(Register dst, Register src) {
if (CpuFeatures::IsSupported(BMI1)) {
CpuFeatureScope scope(this, BMI1);
tzcntl(dst, src);
return;
}
Label not_zero_src;
bsfl(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
movl(dst, Immediate(32)); // The result of tzcnt is 32 if src = 0.
bind(&not_zero_src);
}
void TurboAssembler::Tzcntl(Register dst, Operand src) {
if (CpuFeatures::IsSupported(BMI1)) {
CpuFeatureScope scope(this, BMI1);
tzcntl(dst, src);
return;
}
Label not_zero_src;
bsfl(dst, src);
j(not_zero, &not_zero_src, Label::kNear);
movl(dst, Immediate(32)); // The result of tzcnt is 32 if src = 0.
bind(&not_zero_src);
}
void TurboAssembler::Popcntl(Register dst, Register src) {
if (CpuFeatures::IsSupported(POPCNT)) {
CpuFeatureScope scope(this, POPCNT);
popcntl(dst, src);
return;
}
UNREACHABLE();
}
void TurboAssembler::Popcntl(Register dst, Operand src) {
if (CpuFeatures::IsSupported(POPCNT)) {
CpuFeatureScope scope(this, POPCNT);
popcntl(dst, src);
return;
}
UNREACHABLE();
}
void TurboAssembler::Popcntq(Register dst, Register src) {
if (CpuFeatures::IsSupported(POPCNT)) {
CpuFeatureScope scope(this, POPCNT);
popcntq(dst, src);
return;
}
UNREACHABLE();
}
void TurboAssembler::Popcntq(Register dst, Operand src) {
if (CpuFeatures::IsSupported(POPCNT)) {
CpuFeatureScope scope(this, POPCNT);
popcntq(dst, src);
return;
}
UNREACHABLE();
}
// Order general registers are pushed by Pushad:
// rax, rcx, rdx, rbx, rsi, rdi, r8, r9, r11, r14, r15.
const int
MacroAssembler::kSafepointPushRegisterIndices[Register::kNumRegisters] = {
0, 1, 2, 3, -1, -1, 4, 5, 6, 7, -1, 8, 9, -1, 10, 11};
void MacroAssembler::PushStackHandler() {
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 2 * kSystemPointerSize);
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
Push(Immediate(0)); // Padding.
// Link the current handler as the next handler.
ExternalReference handler_address =
ExternalReference::Create(IsolateAddressId::kHandlerAddress, isolate());
Push(ExternalReferenceAsOperand(handler_address));
// Set this new handler as the current one.
movq(ExternalReferenceAsOperand(handler_address), rsp);
}
void MacroAssembler::PopStackHandler() {
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
ExternalReference handler_address =
ExternalReference::Create(IsolateAddressId::kHandlerAddress, isolate());
Pop(ExternalReferenceAsOperand(handler_address));
addq(rsp, Immediate(StackHandlerConstants::kSize - kSystemPointerSize));
}
void TurboAssembler::Ret() { ret(0); }
void TurboAssembler::Ret(int bytes_dropped, Register scratch) {
if (is_uint16(bytes_dropped)) {
ret(bytes_dropped);
} else {
PopReturnAddressTo(scratch);
addq(rsp, Immediate(bytes_dropped));
PushReturnAddressFrom(scratch);
ret(0);
}
}
void MacroAssembler::CmpObjectType(Register heap_object, InstanceType type,
Register map) {
LoadMap(map, heap_object);
CmpInstanceType(map, type);
}
void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
cmpw(FieldOperand(map, Map::kInstanceTypeOffset), Immediate(type));
}
void MacroAssembler::AssertNotSmi(Register object) {
if (emit_debug_code()) {
Condition is_smi = CheckSmi(object);
Check(NegateCondition(is_smi), AbortReason::kOperandIsASmi);
}
}
void MacroAssembler::AssertSmi(Register object) {
if (emit_debug_code()) {
Condition is_smi = CheckSmi(object);
Check(is_smi, AbortReason::kOperandIsNotASmi);
}
}
void MacroAssembler::AssertSmi(Operand object) {
if (emit_debug_code()) {
Condition is_smi = CheckSmi(object);
Check(is_smi, AbortReason::kOperandIsNotASmi);
}
}
void TurboAssembler::AssertZeroExtended(Register int32_register) {
if (emit_debug_code()) {
DCHECK_NE(int32_register, kScratchRegister);
movq(kScratchRegister, int64_t{0x0000000100000000});
cmpq(kScratchRegister, int32_register);
Check(above, AbortReason::k32BitValueInRegisterIsNotZeroExtended);
}
}
void MacroAssembler::AssertConstructor(Register object) {
if (emit_debug_code()) {
testb(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotAConstructor);
Push(object);
LoadMap(object, object);
testb(FieldOperand(object, Map::kBitFieldOffset),
Immediate(Map::Bits1::IsConstructorBit::kMask));
Pop(object);
Check(not_zero, AbortReason::kOperandIsNotAConstructor);
}
}
void MacroAssembler::AssertFunction(Register object) {
if (emit_debug_code()) {
testb(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotAFunction);
Push(object);
CmpObjectType(object, JS_FUNCTION_TYPE, object);
Pop(object);
Check(equal, AbortReason::kOperandIsNotAFunction);
}
}
void MacroAssembler::AssertBoundFunction(Register object) {
if (emit_debug_code()) {
testb(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotABoundFunction);
Push(object);
CmpObjectType(object, JS_BOUND_FUNCTION_TYPE, object);
Pop(object);
Check(equal, AbortReason::kOperandIsNotABoundFunction);
}
}
void MacroAssembler::AssertGeneratorObject(Register object) {
if (!emit_debug_code()) return;
testb(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotAGeneratorObject);
// Load map
Register map = object;
Push(object);
LoadMap(map, object);
Label do_check;
// Check if JSGeneratorObject
CmpInstanceType(map, JS_GENERATOR_OBJECT_TYPE);
j(equal, &do_check);
// Check if JSAsyncFunctionObject
CmpInstanceType(map, JS_ASYNC_FUNCTION_OBJECT_TYPE);
j(equal, &do_check);
// Check if JSAsyncGeneratorObject
CmpInstanceType(map, JS_ASYNC_GENERATOR_OBJECT_TYPE);
bind(&do_check);
// Restore generator object to register and perform assertion
Pop(object);
Check(equal, AbortReason::kOperandIsNotAGeneratorObject);
}
void MacroAssembler::AssertUndefinedOrAllocationSite(Register object) {
if (emit_debug_code()) {
Label done_checking;
AssertNotSmi(object);
Cmp(object, isolate()->factory()->undefined_value());
j(equal, &done_checking);
Cmp(FieldOperand(object, 0), isolate()->factory()->allocation_site_map());
Assert(equal, AbortReason::kExpectedUndefinedOrCell);
bind(&done_checking);
}
}
void MacroAssembler::LoadWeakValue(Register in_out, Label* target_if_cleared) {
cmpl(in_out, Immediate(kClearedWeakHeapObjectLower32));
j(equal, target_if_cleared);
andq(in_out, Immediate(~static_cast<int32_t>(kWeakHeapObjectMask)));
}
void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) {
DCHECK_GT(value, 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand counter_operand =
ExternalReferenceAsOperand(ExternalReference::Create(counter));
// This operation has to be exactly 32-bit wide in case the external
// reference table redirects the counter to a uint32_t dummy_stats_counter_
// field.
if (value == 1) {
incl(counter_operand);
} else {
addl(counter_operand, Immediate(value));
}
}
}
void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) {
DCHECK_GT(value, 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand counter_operand =
ExternalReferenceAsOperand(ExternalReference::Create(counter));
// This operation has to be exactly 32-bit wide in case the external
// reference table redirects the counter to a uint32_t dummy_stats_counter_
// field.
if (value == 1) {
decl(counter_operand);
} else {
subl(counter_operand, Immediate(value));
}
}
}
void MacroAssembler::MaybeDropFrames() {
// Check whether we need to drop frames to restart a function on the stack.
ExternalReference restart_fp =
ExternalReference::debug_restart_fp_address(isolate());
Load(rbx, restart_fp);
testq(rbx, rbx);
Label dont_drop;
j(zero, &dont_drop, Label::kNear);
Jump(BUILTIN_CODE(isolate(), FrameDropperTrampoline), RelocInfo::CODE_TARGET);
bind(&dont_drop);
}
void TurboAssembler::PrepareForTailCall(Register callee_args_count,
Register caller_args_count,
Register scratch0, Register scratch1) {
DCHECK(!AreAliased(callee_args_count, caller_args_count, scratch0, scratch1));
// Calculate the destination address where we will put the return address
// after we drop current frame.
Register new_sp_reg = scratch0;
subq(caller_args_count, callee_args_count);
leaq(new_sp_reg, Operand(rbp, caller_args_count, times_system_pointer_size,
StandardFrameConstants::kCallerPCOffset));
if (FLAG_debug_code) {
cmpq(rsp, new_sp_reg);
Check(below, AbortReason::kStackAccessBelowStackPointer);
}
// Copy return address from caller's frame to current frame's return address
// to avoid its trashing and let the following loop copy it to the right
// place.
Register tmp_reg = scratch1;
movq(tmp_reg, Operand(rbp, StandardFrameConstants::kCallerPCOffset));
movq(Operand(rsp, 0), tmp_reg);
// Restore caller's frame pointer now as it could be overwritten by
// the copying loop.
movq(rbp, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
// +2 here is to copy both receiver and return address.
Register count_reg = caller_args_count;
leaq(count_reg, Operand(callee_args_count, 2));
// Now copy callee arguments to the caller frame going backwards to avoid
// callee arguments corruption (source and destination areas could overlap).
Label loop, entry;
jmp(&entry, Label::kNear);
bind(&loop);
decq(count_reg);
movq(tmp_reg, Operand(rsp, count_reg, times_system_pointer_size, 0));
movq(Operand(new_sp_reg, count_reg, times_system_pointer_size, 0), tmp_reg);
bind(&entry);
cmpq(count_reg, Immediate(0));
j(not_equal, &loop, Label::kNear);
// Leave current frame.
movq(rsp, new_sp_reg);
}
void MacroAssembler::InvokeFunction(Register function, Register new_target,
Register actual_parameter_count,
InvokeFlag flag) {
LoadTaggedPointerField(
rbx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
movzxwq(rbx,
FieldOperand(rbx, SharedFunctionInfo::kFormalParameterCountOffset));
InvokeFunction(function, new_target, rbx, actual_parameter_count, flag);
}
void MacroAssembler::InvokeFunction(Register function, Register new_target,
Register expected_parameter_count,
Register actual_parameter_count,
InvokeFlag flag) {
DCHECK(function == rdi);
LoadTaggedPointerField(rsi,
FieldOperand(function, JSFunction::kContextOffset));
InvokeFunctionCode(rdi, new_target, expected_parameter_count,
actual_parameter_count, flag);
}
void MacroAssembler::InvokeFunctionCode(Register function, Register new_target,
Register expected_parameter_count,
Register actual_parameter_count,
InvokeFlag flag) {
// You can't call a function without a valid frame.
DCHECK_IMPLIES(flag == CALL_FUNCTION, has_frame());
DCHECK_EQ(function, rdi);
DCHECK_IMPLIES(new_target.is_valid(), new_target == rdx);
// On function call, call into the debugger if necessary.
Label debug_hook, continue_after_hook;
{
ExternalReference debug_hook_active =
ExternalReference::debug_hook_on_function_call_address(isolate());
Operand debug_hook_active_operand =
ExternalReferenceAsOperand(debug_hook_active);
cmpb(debug_hook_active_operand, Immediate(0));
j(not_equal, &debug_hook);
}
bind(&continue_after_hook);
// Clear the new.target register if not given.
if (!new_target.is_valid()) {
LoadRoot(rdx, RootIndex::kUndefinedValue);
}
Label done;
InvokePrologue(expected_parameter_count, actual_parameter_count, &done, flag);
// We call indirectly through the code field in the function to
// allow recompilation to take effect without changing any of the
// call sites.
static_assert(kJavaScriptCallCodeStartRegister == rcx, "ABI mismatch");
LoadTaggedPointerField(rcx, FieldOperand(function, JSFunction::kCodeOffset));
if (flag == CALL_FUNCTION) {
CallCodeObject(rcx);
} else {
DCHECK(flag == JUMP_FUNCTION);
JumpCodeObject(rcx);
}
jmp(&done, Label::kNear);
// Deferred debug hook.
bind(&debug_hook);
CallDebugOnFunctionCall(function, new_target, expected_parameter_count,
actual_parameter_count);
jmp(&continue_after_hook);
bind(&done);
}
Operand MacroAssembler::StackLimitAsOperand(StackLimitKind kind) {
DCHECK(root_array_available());
Isolate* isolate = this->isolate();
ExternalReference limit =
kind == StackLimitKind::kRealStackLimit
? ExternalReference::address_of_real_jslimit(isolate)
: ExternalReference::address_of_jslimit(isolate);
DCHECK(TurboAssembler::IsAddressableThroughRootRegister(isolate, limit));
intptr_t offset =
TurboAssembler::RootRegisterOffsetForExternalReference(isolate, limit);
CHECK(is_int32(offset));
return Operand(kRootRegister, static_cast<int32_t>(offset));
}
void MacroAssembler::StackOverflowCheck(
Register num_args, Register scratch, Label* stack_overflow,
Label::Distance stack_overflow_distance) {
DCHECK_NE(num_args, scratch);
// Check the stack for overflow. We are not trying to catch
// interruptions (e.g. debug break and preemption) here, so the "real stack
// limit" is checked.
movq(kScratchRegister, StackLimitAsOperand(StackLimitKind::kRealStackLimit));
movq(scratch, rsp);
// Make scratch the space we have left. The stack might already be overflowed
// here which will cause scratch to become negative.
subq(scratch, kScratchRegister);
// TODO(victorgomes): Use ia32 approach with leaq, since it requires less
// instructions.
sarq(scratch, Immediate(kSystemPointerSizeLog2));
// Check if the arguments will overflow the stack.
cmpq(scratch, num_args);
// Signed comparison.
// TODO(victorgomes): Save some bytes in the builtins that use stack checks
// by jumping to a builtin that throws the exception.
j(less_equal, stack_overflow, stack_overflow_distance);
}
void MacroAssembler::InvokePrologue(Register expected_parameter_count,
Register actual_parameter_count,
Label* done, InvokeFlag flag) {
if (expected_parameter_count != actual_parameter_count) {
Label regular_invoke;
#ifdef V8_NO_ARGUMENTS_ADAPTOR
// If the expected parameter count is equal to the adaptor sentinel, no need
// to push undefined value as arguments.
cmpl(expected_parameter_count, Immediate(kDontAdaptArgumentsSentinel));
j(equal, &regular_invoke, Label::kFar);
// If overapplication or if the actual argument count is equal to the
// formal parameter count, no need to push extra undefined values.
subq(expected_parameter_count, actual_parameter_count);
j(less_equal, &regular_invoke, Label::kFar);
Label stack_overflow;
StackOverflowCheck(expected_parameter_count, rcx, &stack_overflow);
// Underapplication. Move the arguments already in the stack, including the
// receiver and the return address.
{
Label copy, check;
Register src = r8, dest = rsp, num = r9, current = r11;
movq(src, rsp);
leaq(kScratchRegister,
Operand(expected_parameter_count, times_system_pointer_size, 0));
AllocateStackSpace(kScratchRegister);
// Extra words are the receiver and the return address (if a jump).
int extra_words = flag == CALL_FUNCTION ? 1 : 2;
leaq(num, Operand(rax, extra_words)); // Number of words to copy.
Set(current, 0);
// Fall-through to the loop body because there are non-zero words to copy.
bind(&copy);
movq(kScratchRegister,
Operand(src, current, times_system_pointer_size, 0));
movq(Operand(dest, current, times_system_pointer_size, 0),
kScratchRegister);
incq(current);
bind(&check);
cmpq(current, num);
j(less, &copy);
leaq(r8, Operand(rsp, num, times_system_pointer_size, 0));
}
// Fill remaining expected arguments with undefined values.
LoadRoot(kScratchRegister, RootIndex::kUndefinedValue);
{
Label loop;
bind(&loop);
decq(expected_parameter_count);
movq(Operand(r8, expected_parameter_count, times_system_pointer_size, 0),
kScratchRegister);
j(greater, &loop, Label::kNear);
}
jmp(&regular_invoke);
bind(&stack_overflow);
{
FrameScope frame(this,
has_frame() ? StackFrame::NONE : StackFrame::INTERNAL);
CallRuntime(Runtime::kThrowStackOverflow);
int3(); // This should be unreachable.
}
#else
// Both expected and actual are in (different) registers. This
// is the case when we invoke functions using call and apply.
cmpq(expected_parameter_count, actual_parameter_count);
j(equal, &regular_invoke, Label::kNear);
DCHECK_EQ(actual_parameter_count, rax);
DCHECK_EQ(expected_parameter_count, rbx);
Handle<Code> adaptor = BUILTIN_CODE(isolate(), ArgumentsAdaptorTrampoline);
if (flag == CALL_FUNCTION) {
Call(adaptor, RelocInfo::CODE_TARGET);
jmp(done, Label::kNear);
} else {
Jump(adaptor, RelocInfo::CODE_TARGET);
}
#endif
bind(&regular_invoke);
} else {
Move(rax, actual_parameter_count);
}
}
void MacroAssembler::CallDebugOnFunctionCall(Register fun, Register new_target,
Register expected_parameter_count,
Register actual_parameter_count) {
FrameScope frame(this, has_frame() ? StackFrame::NONE : StackFrame::INTERNAL);
SmiTag(expected_parameter_count);
Push(expected_parameter_count);
SmiTag(actual_parameter_count);
Push(actual_parameter_count);
SmiUntag(actual_parameter_count);
if (new_target.is_valid()) {
Push(new_target);
}
Push(fun);
Push(fun);
// Arguments are located 2 words below the base pointer.
Operand receiver_op = Operand(rbp, kSystemPointerSize * 2);
Push(receiver_op);
CallRuntime(Runtime::kDebugOnFunctionCall);
Pop(fun);
if (new_target.is_valid()) {
Pop(new_target);
}
Pop(actual_parameter_count);
SmiUntag(actual_parameter_count);
Pop(expected_parameter_count);
SmiUntag(expected_parameter_count);
}
void TurboAssembler::StubPrologue(StackFrame::Type type) {
pushq(rbp); // Caller's frame pointer.
movq(rbp, rsp);
Push(Immediate(StackFrame::TypeToMarker(type)));
}
void TurboAssembler::Prologue() {
pushq(rbp); // Caller's frame pointer.
movq(rbp, rsp);
Push(kContextRegister); // Callee's context.
Push(kJSFunctionRegister); // Callee's JS function.
Push(kJavaScriptCallArgCountRegister); // Actual argument count.
}
void TurboAssembler::EnterFrame(StackFrame::Type type) {
pushq(rbp);
movq(rbp, rsp);
Push(Immediate(StackFrame::TypeToMarker(type)));
}
void TurboAssembler::LeaveFrame(StackFrame::Type type) {
if (emit_debug_code()) {
cmpq(Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset),
Immediate(StackFrame::TypeToMarker(type)));
Check(equal, AbortReason::kStackFrameTypesMustMatch);
}
movq(rsp, rbp);
popq(rbp);
}
#ifdef V8_TARGET_OS_WIN
void TurboAssembler::AllocateStackSpace(Register bytes_scratch) {
// In windows, we cannot increment the stack size by more than one page
// (minimum page size is 4KB) without accessing at least one byte on the
// page. Check this:
// https://msdn.microsoft.com/en-us/library/aa227153(v=vs.60).aspx.
Label check_offset;
Label touch_next_page;
jmp(&check_offset);
bind(&touch_next_page);
subq(rsp, Immediate(kStackPageSize));
// Just to touch the page, before we increment further.
movb(Operand(rsp, 0), Immediate(0));
subq(bytes_scratch, Immediate(kStackPageSize));
bind(&check_offset);
cmpq(bytes_scratch, Immediate(kStackPageSize));
j(greater, &touch_next_page);
subq(rsp, bytes_scratch);
}
void TurboAssembler::AllocateStackSpace(int bytes) {
while (bytes > kStackPageSize) {
subq(rsp, Immediate(kStackPageSize));
movb(Operand(rsp, 0), Immediate(0));
bytes -= kStackPageSize;
}
subq(rsp, Immediate(bytes));
}
#endif
void MacroAssembler::EnterExitFramePrologue(bool save_rax,
StackFrame::Type frame_type) {
DCHECK(frame_type == StackFrame::EXIT ||
frame_type == StackFrame::BUILTIN_EXIT);
// Set up the frame structure on the stack.
// All constants are relative to the frame pointer of the exit frame.
DCHECK_EQ(kFPOnStackSize + kPCOnStackSize,
ExitFrameConstants::kCallerSPDisplacement);
DCHECK_EQ(kFPOnStackSize, ExitFrameConstants::kCallerPCOffset);
DCHECK_EQ(0 * kSystemPointerSize, ExitFrameConstants::kCallerFPOffset);
pushq(rbp);
movq(rbp, rsp);
// Reserve room for entry stack pointer.
Push(Immediate(StackFrame::TypeToMarker(frame_type)));
DCHECK_EQ(-2 * kSystemPointerSize, ExitFrameConstants::kSPOffset);
Push(Immediate(0)); // Saved entry sp, patched before call.
// Save the frame pointer and the context in top.
if (save_rax) {
movq(r14, rax); // Backup rax in callee-save register.
}
Store(
ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate()),
rbp);
Store(ExternalReference::Create(IsolateAddressId::kContextAddress, isolate()),
rsi);
Store(
ExternalReference::Create(IsolateAddressId::kCFunctionAddress, isolate()),
rbx);
}
void MacroAssembler::EnterExitFrameEpilogue(int arg_stack_space,
bool save_doubles) {
#ifdef V8_TARGET_OS_WIN
const int kShadowSpace = 4;
arg_stack_space += kShadowSpace;
#endif
// Optionally save all XMM registers.
if (save_doubles) {
int space = XMMRegister::kNumRegisters * kDoubleSize +
arg_stack_space * kSystemPointerSize;
AllocateStackSpace(space);
int offset = -ExitFrameConstants::kFixedFrameSizeFromFp;
const RegisterConfiguration* config = RegisterConfiguration::Default();
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
DoubleRegister reg =
DoubleRegister::from_code(config->GetAllocatableDoubleCode(i));
Movsd(Operand(rbp, offset - ((i + 1) * kDoubleSize)), reg);
}
} else if (arg_stack_space > 0) {
AllocateStackSpace(arg_stack_space * kSystemPointerSize);
}
// Get the required frame alignment for the OS.
const int kFrameAlignment = base::OS::ActivationFrameAlignment();
if (kFrameAlignment > 0) {
DCHECK(base::bits::IsPowerOfTwo(kFrameAlignment));
DCHECK(is_int8(kFrameAlignment));
andq(rsp, Immediate(-kFrameAlignment));
}
// Patch the saved entry sp.
movq(Operand(rbp, ExitFrameConstants::kSPOffset), rsp);
}
void MacroAssembler::EnterExitFrame(int arg_stack_space, bool save_doubles,
StackFrame::Type frame_type) {
EnterExitFramePrologue(true, frame_type);
// Set up argv in callee-saved register r15. It is reused in LeaveExitFrame,
// so it must be retained across the C-call.
int offset = StandardFrameConstants::kCallerSPOffset - kSystemPointerSize;
leaq(r15, Operand(rbp, r14, times_system_pointer_size, offset));
EnterExitFrameEpilogue(arg_stack_space, save_doubles);
}
void MacroAssembler::EnterApiExitFrame(int arg_stack_space) {
EnterExitFramePrologue(false, StackFrame::EXIT);
EnterExitFrameEpilogue(arg_stack_space, false);
}
void MacroAssembler::LeaveExitFrame(bool save_doubles, bool pop_arguments) {
// Registers:
// r15 : argv
if (save_doubles) {
int offset = -ExitFrameConstants::kFixedFrameSizeFromFp;
const RegisterConfiguration* config = RegisterConfiguration::Default();
for (int i = 0; i < config->num_allocatable_double_registers(); ++i) {
DoubleRegister reg =
DoubleRegister::from_code(config->GetAllocatableDoubleCode(i));
Movsd(reg, Operand(rbp, offset - ((i + 1) * kDoubleSize)));
}
}
if (pop_arguments) {
// Get the return address from the stack and restore the frame pointer.
movq(rcx, Operand(rbp, kFPOnStackSize));
movq(rbp, Operand(rbp, 0 * kSystemPointerSize));
// Drop everything up to and including the arguments and the receiver
// from the caller stack.
leaq(rsp, Operand(r15, 1 * kSystemPointerSize));
PushReturnAddressFrom(rcx);
} else {
// Otherwise just leave the exit frame.
leave();
}
LeaveExitFrameEpilogue();
}
void MacroAssembler::LeaveApiExitFrame() {
movq(rsp, rbp);
popq(rbp);
LeaveExitFrameEpilogue();
}
void MacroAssembler::LeaveExitFrameEpilogue() {
// Restore current context from top and clear it in debug mode.
ExternalReference context_address =
ExternalReference::Create(IsolateAddressId::kContextAddress, isolate());
Operand context_operand = ExternalReferenceAsOperand(context_address);
movq(rsi, context_operand);
#ifdef DEBUG
movq(context_operand, Immediate(Context::kInvalidContext));
#endif
// Clear the top frame.
ExternalReference c_entry_fp_address =
ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate());
Operand c_entry_fp_operand = ExternalReferenceAsOperand(c_entry_fp_address);
movq(c_entry_fp_operand, Immediate(0));
}
#ifdef V8_TARGET_OS_WIN
static const int kRegisterPassedArguments = 4;
#else
static const int kRegisterPassedArguments = 6;
#endif
void MacroAssembler::LoadNativeContextSlot(int index, Register dst) {
// Load native context.
LoadMap(dst, rsi);
LoadTaggedPointerField(
dst,
FieldOperand(dst, Map::kConstructorOrBackPointerOrNativeContextOffset));
// Load value from native context.
LoadTaggedPointerField(dst, Operand(dst, Context::SlotOffset(index)));
}
int TurboAssembler::ArgumentStackSlotsForCFunctionCall(int num_arguments) {
// On Windows 64 stack slots are reserved by the caller for all arguments
// including the ones passed in registers, and space is always allocated for
// the four register arguments even if the function takes fewer than four
// arguments.
// On AMD64 ABI (Linux/Mac) the first six arguments are passed in registers
// and the caller does not reserve stack slots for them.
DCHECK_GE(num_arguments, 0);
#ifdef V8_TARGET_OS_WIN
const int kMinimumStackSlots = kRegisterPassedArguments;
if (num_arguments < kMinimumStackSlots) return kMinimumStackSlots;
return num_arguments;
#else
if (num_arguments < kRegisterPassedArguments) return 0;
return num_arguments - kRegisterPassedArguments;
#endif
}
void TurboAssembler::PrepareCallCFunction(int num_arguments) {
int frame_alignment = base::OS::ActivationFrameAlignment();
DCHECK_NE(frame_alignment, 0);
DCHECK_GE(num_arguments, 0);
// Make stack end at alignment and allocate space for arguments and old rsp.
movq(kScratchRegister, rsp);
DCHECK(base::bits::IsPowerOfTwo(frame_alignment));
int argument_slots_on_stack =
ArgumentStackSlotsForCFunctionCall(num_arguments);
AllocateStackSpace((argument_slots_on_stack + 1) * kSystemPointerSize);
andq(rsp, Immediate(-frame_alignment));
movq(Operand(rsp, argument_slots_on_stack * kSystemPointerSize),
kScratchRegister);
}
void TurboAssembler::CallCFunction(ExternalReference function,
int num_arguments) {
LoadAddress(rax, function);
CallCFunction(rax, num_arguments);
}
void TurboAssembler::CallCFunction(Register function, int num_arguments) {
DCHECK_LE(num_arguments, kMaxCParameters);
DCHECK(has_frame());
// Check stack alignment.
if (emit_debug_code()) {
CheckStackAlignment();
}
// Save the frame pointer and PC so that the stack layout remains iterable,
// even without an ExitFrame which normally exists between JS and C frames.
Label get_pc;
DCHECK(!AreAliased(kScratchRegister, function));
leaq(kScratchRegister, Operand(&get_pc, 0));
bind(&get_pc);
// Addressing the following external references is tricky because we need
// this to work in three situations:
// 1. In wasm compilation, the isolate is nullptr and thus no
// ExternalReference can be created, but we can construct the address
// directly using the root register and a static offset.
// 2. In normal JIT (and builtin) compilation, the external reference is
// usually addressed through the root register, so we can use the direct
// offset directly in most cases.
// 3. In regexp compilation, the external reference is embedded into the reloc
// info.
// The solution here is to use root register offsets wherever possible in
// which case we can construct it directly. When falling back to external
// references we need to ensure that the scratch register does not get
// accidentally overwritten. If we run into more such cases in the future, we
// should implement a more general solution.
if (root_array_available()) {
movq(Operand(kRootRegister, IsolateData::fast_c_call_caller_pc_offset()),
kScratchRegister);
movq(Operand(kRootRegister, IsolateData::fast_c_call_caller_fp_offset()),
rbp);
} else {
DCHECK_NOT_NULL(isolate());
// Use alternative scratch register in order not to overwrite
// kScratchRegister.
Register scratch = r12;
pushq(scratch);
movq(ExternalReferenceAsOperand(
ExternalReference::fast_c_call_caller_pc_address(isolate()),
scratch),
kScratchRegister);
movq(ExternalReferenceAsOperand(
ExternalReference::fast_c_call_caller_fp_address(isolate())),
rbp);
popq(scratch);
}
call(function);
// We don't unset the PC; the FP is the source of truth.
if (root_array_available()) {
movq(Operand(kRootRegister, IsolateData::fast_c_call_caller_fp_offset()),
Immediate(0));
} else {
DCHECK_NOT_NULL(isolate());
movq(ExternalReferenceAsOperand(
ExternalReference::fast_c_call_caller_fp_address(isolate())),
Immediate(0));
}
DCHECK_NE(base::OS::ActivationFrameAlignment(), 0);
DCHECK_GE(num_arguments, 0);
int argument_slots_on_stack =
ArgumentStackSlotsForCFunctionCall(num_arguments);
movq(rsp, Operand(rsp, argument_slots_on_stack * kSystemPointerSize));
}
void TurboAssembler::CheckPageFlag(Register object, Register scratch, int mask,
Condition cc, Label* condition_met,
Label::Distance condition_met_distance) {
DCHECK(cc == zero || cc == not_zero);
if (scratch == object) {
andq(scratch, Immediate(~kPageAlignmentMask));
} else {
movq(scratch, Immediate(~kPageAlignmentMask));
andq(scratch, object);
}
if (mask < (1 << kBitsPerByte)) {
testb(Operand(scratch, BasicMemoryChunk::kFlagsOffset),
Immediate(static_cast<uint8_t>(mask)));
} else {
testl(Operand(scratch, BasicMemoryChunk::kFlagsOffset), Immediate(mask));
}
j(cc, condition_met, condition_met_distance);
}
void TurboAssembler::ComputeCodeStartAddress(Register dst) {
Label current;
bind(&current);
int pc = pc_offset();
// Load effective address to get the address of the current instruction.
leaq(dst, Operand(&current, -pc));
}
void TurboAssembler::ResetSpeculationPoisonRegister() {
// TODO(tebbi): Perhaps, we want to put an lfence here.
Set(kSpeculationPoisonRegister, -1);
}
void TurboAssembler::CallForDeoptimization(Builtins::Name target, int,
Label* exit, DeoptimizeKind kind,
Label*) {
// Note: Assembler::call is used here on purpose to guarantee fixed-size
// exits even on Atom CPUs; see TurboAssembler::Call for Atom-specific
// performance tuning which emits a different instruction sequence.
call(EntryFromBuiltinIndexAsOperand(target));
DCHECK_EQ(SizeOfCodeGeneratedSince(exit),
(kind == DeoptimizeKind::kLazy)
? Deoptimizer::kLazyDeoptExitSize
: Deoptimizer::kNonLazyDeoptExitSize);
USE(exit, kind);
}
void TurboAssembler::Trap() { int3(); }
void TurboAssembler::DebugBreak() { int3(); }
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_X64