Google Git
Sign in
cobalt / cobalt / 1bf8b4dd7753e80946b50c77b33fdf15f7df959b / . / src / v8 / src / x64 / macro-assembler-x64.cc
blob: 56d0e7a5ce100490a1e5a1666c4c7348b77d8dcb [file] [log] [blame]
// 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/bootstrapper.h"
#include "src/callable.h"
#include "src/codegen.h"
#include "src/counters.h"
#include "src/debug/debug.h"
#include "src/external-reference-table.h"
#include "src/frames-inl.h"
#include "src/heap/heap-inl.h"
#include "src/objects-inl.h"
#include "src/register-configuration.h"
#include "src/x64/assembler-x64.h"
#include "src/x64/macro-assembler-x64.h" // Cannot be the first include.
namespace v8 {
namespace internal {
MacroAssembler::MacroAssembler(Isolate* isolate, void* buffer, int size,
CodeObjectRequired create_code_object)
: TurboAssembler(isolate, buffer, size, create_code_object) {}
TurboAssembler::TurboAssembler(Isolate* isolate, void* buffer, int buffer_size,
CodeObjectRequired create_code_object)
: Assembler(isolate, buffer, buffer_size), isolate_(isolate) {
if (create_code_object == CodeObjectRequired::kYes) {
code_object_ =
Handle<HeapObject>::New(isolate->heap()->undefined_value(), isolate);
}
}
static const int64_t kInvalidRootRegisterDelta = -1;
int64_t TurboAssembler::RootRegisterDelta(ExternalReference other) {
if (predictable_code_size() &&
(other.address() < reinterpret_cast<Address>(isolate()) ||
other.address() >= reinterpret_cast<Address>(isolate() + 1))) {
return kInvalidRootRegisterDelta;
}
Address roots_register_value =
kRootRegisterBias +
reinterpret_cast<Address>(isolate()->heap()->roots_array_start());
int64_t delta = kInvalidRootRegisterDelta; // Bogus initialization.
if (kPointerSize == kInt64Size) {
delta = other.address() - roots_register_value;
} else {
// For x32, zero extend the address to 64-bit and calculate the delta.
uint64_t o = static_cast<uint32_t>(
reinterpret_cast<intptr_t>(other.address()));
uint64_t r = static_cast<uint32_t>(
reinterpret_cast<intptr_t>(roots_register_value));
delta = o - r;
}
return delta;
}
Operand MacroAssembler::ExternalOperand(ExternalReference target,
Register scratch) {
if (root_array_available_ && !serializer_enabled()) {
int64_t delta = RootRegisterDelta(target);
if (delta != kInvalidRootRegisterDelta && is_int32(delta)) {
return Operand(kRootRegister, static_cast<int32_t>(delta));
}
}
Move(scratch, target);
return Operand(scratch, 0);
}
void MacroAssembler::Load(Register destination, ExternalReference source) {
if (root_array_available_ && !serializer_enabled()) {
int64_t delta = RootRegisterDelta(source);
if (delta != kInvalidRootRegisterDelta && is_int32(delta)) {
movp(destination, Operand(kRootRegister, static_cast<int32_t>(delta)));
return;
}
}
// Safe code.
if (destination == rax) {
load_rax(source);
} else {
Move(kScratchRegister, source);
movp(destination, Operand(kScratchRegister, 0));
}
}
void MacroAssembler::Store(ExternalReference destination, Register source) {
if (root_array_available_ && !serializer_enabled()) {
int64_t delta = RootRegisterDelta(destination);
if (delta != kInvalidRootRegisterDelta && is_int32(delta)) {
movp(Operand(kRootRegister, static_cast<int32_t>(delta)), source);
return;
}
}
// Safe code.
if (source == rax) {
store_rax(destination);
} else {
Move(kScratchRegister, destination);
movp(Operand(kScratchRegister, 0), source);
}
}
void TurboAssembler::LoadAddress(Register destination,
ExternalReference source) {
if (root_array_available_ && !serializer_enabled()) {
int64_t delta = RootRegisterDelta(source);
if (delta != kInvalidRootRegisterDelta && is_int32(delta)) {
leap(destination, Operand(kRootRegister, static_cast<int32_t>(delta)));
return;
}
}
// Safe code.
Move(destination, source);
}
int TurboAssembler::LoadAddressSize(ExternalReference source) {
if (root_array_available_ && !serializer_enabled()) {
// This calculation depends on the internals of LoadAddress.
// It's correctness is ensured by the asserts in the Call
// instruction below.
int64_t delta = RootRegisterDelta(source);
if (delta != kInvalidRootRegisterDelta && is_int32(delta)) {
// Operand is leap(scratch, Operand(kRootRegister, delta));
// Opcodes : REX.W 8D ModRM Disp8/Disp32 - 4 or 7.
int size = 4;
if (!is_int8(static_cast<int32_t>(delta))) {
size += 3; // Need full four-byte displacement in lea.
}
return size;
}
}
// Size of movp(destination, src);
return Assembler::kMoveAddressIntoScratchRegisterInstructionLength;
}
void MacroAssembler::PushAddress(ExternalReference source) {
int64_t address = reinterpret_cast<int64_t>(source.address());
if (is_int32(address) && !serializer_enabled()) {
if (emit_debug_code()) {
Move(kScratchRegister, kZapValue, Assembler::RelocInfoNone());
}
Push(Immediate(static_cast<int32_t>(address)));
return;
}
LoadAddress(kScratchRegister, source);
Push(kScratchRegister);
}
void TurboAssembler::LoadRoot(Register destination, Heap::RootListIndex index) {
DCHECK(root_array_available_);
movp(destination, Operand(kRootRegister,
(index << kPointerSizeLog2) - kRootRegisterBias));
}
void MacroAssembler::LoadRootIndexed(Register destination,
Register variable_offset,
int fixed_offset) {
DCHECK(root_array_available_);
movp(destination,
Operand(kRootRegister,
variable_offset, times_pointer_size,
(fixed_offset << kPointerSizeLog2) - kRootRegisterBias));
}
void MacroAssembler::PushRoot(Heap::RootListIndex index) {
DCHECK(root_array_available_);
Push(Operand(kRootRegister, (index << kPointerSizeLog2) - kRootRegisterBias));
}
void TurboAssembler::CompareRoot(Register with, Heap::RootListIndex index) {
DCHECK(root_array_available_);
cmpp(with, Operand(kRootRegister,
(index << kPointerSizeLog2) - kRootRegisterBias));
}
void TurboAssembler::CompareRoot(const Operand& with,
Heap::RootListIndex index) {
DCHECK(root_array_available_);
DCHECK(!with.AddressUsesRegister(kScratchRegister));
LoadRoot(kScratchRegister, index);
cmpp(with, kScratchRegister);
}
void MacroAssembler::RememberedSetHelper(Register object, // For debug tests.
Register addr,
Register scratch,
SaveFPRegsMode save_fp,
RememberedSetFinalAction and_then) {
if (emit_debug_code()) {
Label ok;
JumpIfNotInNewSpace(object, scratch, &ok, Label::kNear);
int3();
bind(&ok);
}
// Load store buffer top.
ExternalReference store_buffer =
ExternalReference::store_buffer_top(isolate());
DCHECK(scratch != kScratchRegister);
Move(kScratchRegister, store_buffer);
movp(scratch, Operand(kScratchRegister, 0));
// Store pointer to buffer.
movp(Operand(scratch, 0), addr);
// Increment buffer top.
addp(scratch, Immediate(kPointerSize));
// Write back new top of buffer.
movp(Operand(kScratchRegister, 0), scratch);
// Call stub on end of buffer.
Label done;
// Check for end of buffer.
testp(scratch, Immediate(StoreBuffer::kStoreBufferMask));
if (and_then == kReturnAtEnd) {
Label buffer_overflowed;
j(equal, &buffer_overflowed, Label::kNear);
ret(0);
bind(&buffer_overflowed);
} else {
DCHECK(and_then == kFallThroughAtEnd);
j(not_equal, &done, Label::kNear);
}
StoreBufferOverflowStub store_buffer_overflow(isolate(), save_fp);
CallStub(&store_buffer_overflow);
if (and_then == kReturnAtEnd) {
ret(0);
} else {
DCHECK(and_then == kFallThroughAtEnd);
bind(&done);
}
}
void MacroAssembler::InNewSpace(Register object,
Register scratch,
Condition cc,
Label* branch,
Label::Distance distance) {
CheckPageFlag(object, scratch, MemoryChunk::kIsInNewSpaceMask, cc, branch,
distance);
}
void MacroAssembler::RecordWriteField(
Register object,
int offset,
Register value,
Register dst,
SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action,
SmiCheck smi_check,
PointersToHereCheck pointers_to_here_check_for_value) {
// 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 so offset must be a multiple of kPointerSize.
DCHECK(IsAligned(offset, kPointerSize));
leap(dst, FieldOperand(object, offset));
if (emit_debug_code()) {
Label ok;
testb(dst, Immediate(kPointerSize - 1));
j(zero, &ok, Label::kNear);
int3();
bind(&ok);
}
RecordWrite(object, dst, value, save_fp, remembered_set_action,
OMIT_SMI_CHECK, pointers_to_here_check_for_value);
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, Assembler::RelocInfoNone());
Move(dst, kZapValue, Assembler::RelocInfoNone());
}
}
void TurboAssembler::SaveRegisters(RegList registers) {
DCHECK(NumRegs(registers) > 0);
for (int i = 0; i < Register::kNumRegisters; ++i) {
if ((registers >> i) & 1u) {
pushq(Register::from_code(i));
}
}
}
void TurboAssembler::RestoreRegisters(RegList registers) {
DCHECK(NumRegs(registers) > 0);
for (int i = Register::kNumRegisters - 1; i >= 0; --i) {
if ((registers >> i) & 1u) {
popq(Register::from_code(i));
}
}
}
void TurboAssembler::CallRecordWriteStub(
Register object, Register address,
RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode) {
Callable const callable =
Builtins::CallableFor(isolate(), Builtins::kRecordWrite);
RegList registers = callable.descriptor().allocatable_registers();
SaveRegisters(registers);
Register object_parameter(callable.descriptor().GetRegisterParameter(
RecordWriteDescriptor::kObject));
Register slot_parameter(
callable.descriptor().GetRegisterParameter(RecordWriteDescriptor::kSlot));
Register isolate_parameter(callable.descriptor().GetRegisterParameter(
RecordWriteDescriptor::kIsolate));
Register remembered_set_parameter(callable.descriptor().GetRegisterParameter(
RecordWriteDescriptor::kRememberedSet));
Register fp_mode_parameter(callable.descriptor().GetRegisterParameter(
RecordWriteDescriptor::kFPMode));
pushq(object);
pushq(address);
popq(slot_parameter);
popq(object_parameter);
LoadAddress(isolate_parameter, ExternalReference::isolate_address(isolate()));
Move(remembered_set_parameter, Smi::FromEnum(remembered_set_action));
Move(fp_mode_parameter, Smi::FromEnum(fp_mode));
Call(callable.code(), RelocInfo::CODE_TARGET);
RestoreRegisters(registers);
}
void MacroAssembler::RecordWriteForMap(Register object,
Register map,
Register dst,
SaveFPRegsMode fp_mode) {
DCHECK(object != kScratchRegister);
DCHECK(object != map);
DCHECK(object != dst);
DCHECK(map != dst);
AssertNotSmi(object);
if (emit_debug_code()) {
Label ok;
if (map == kScratchRegister) pushq(map);
CompareMap(map, isolate()->factory()->meta_map());
if (map == kScratchRegister) popq(map);
j(equal, &ok, Label::kNear);
int3();
bind(&ok);
}
if (!FLAG_incremental_marking) {
return;
}
if (emit_debug_code()) {
Label ok;
if (map == kScratchRegister) pushq(map);
cmpp(map, FieldOperand(object, HeapObject::kMapOffset));
if (map == kScratchRegister) popq(map);
j(equal, &ok, Label::kNear);
int3();
bind(&ok);
}
// Compute the address.
leap(dst, FieldOperand(object, HeapObject::kMapOffset));
// First, check if a write barrier is even needed. The tests below
// catch stores of smis and stores into the young generation.
Label done;
// A single check of the map's pages interesting flag suffices, since it is
// only set during incremental collection, and then it's also guaranteed that
// the from object's page's interesting flag is also set. This optimization
// relies on the fact that maps can never be in new space.
CheckPageFlag(map,
map, // Used as scratch.
MemoryChunk::kPointersToHereAreInterestingMask,
zero,
&done,
Label::kNear);
RecordWriteStub stub(isolate(), object, map, dst, OMIT_REMEMBERED_SET,
fp_mode);
CallStub(&stub);
bind(&done);
// Count number of write barriers in generated code.
isolate()->counters()->write_barriers_static()->Increment();
IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1);
// Clobber clobbered registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
Move(dst, kZapValue, Assembler::RelocInfoNone());
Move(map, kZapValue, Assembler::RelocInfoNone());
}
}
void MacroAssembler::RecordWrite(
Register object,
Register address,
Register value,
SaveFPRegsMode fp_mode,
RememberedSetAction remembered_set_action,
SmiCheck smi_check,
PointersToHereCheck pointers_to_here_check_for_value) {
DCHECK(object != value);
DCHECK(object != address);
DCHECK(value != address);
AssertNotSmi(object);
if (remembered_set_action == OMIT_REMEMBERED_SET &&
!FLAG_incremental_marking) {
return;
}
if (emit_debug_code()) {
Label ok;
cmpp(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);
}
if (pointers_to_here_check_for_value != kPointersToHereAreAlwaysInteresting) {
CheckPageFlag(value,
value, // Used as scratch.
MemoryChunk::kPointersToHereAreInterestingMask,
zero,
&done,
Label::kNear);
}
CheckPageFlag(object,
value, // Used as scratch.
MemoryChunk::kPointersFromHereAreInterestingMask,
zero,
&done,
Label::kNear);
#ifdef V8_CSA_WRITE_BARRIER
CallRecordWriteStub(object, address, remembered_set_action, fp_mode);
#else
RecordWriteStub stub(isolate(), object, value, address, remembered_set_action,
fp_mode);
CallStub(&stub);
#endif
bind(&done);
// Count number of write barriers in generated code.
isolate()->counters()->write_barriers_static()->Increment();
IncrementCounter(isolate()->counters()->write_barriers_dynamic(), 1);
// Clobber clobbered registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
Move(address, kZapValue, Assembler::RelocInfoNone());
Move(value, kZapValue, Assembler::RelocInfoNone());
}
}
void TurboAssembler::Assert(Condition cc, BailoutReason reason) {
if (emit_debug_code()) Check(cc, reason);
}
void TurboAssembler::AssertUnreachable(BailoutReason reason) {
if (emit_debug_code()) Abort(reason);
}
void TurboAssembler::Check(Condition cc, BailoutReason 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 > kPointerSize) {
DCHECK(base::bits::IsPowerOfTwo(frame_alignment));
Label alignment_as_expected;
testp(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(BailoutReason reason) {
#ifdef DEBUG
const char* msg = GetBailoutReason(reason);
if (msg != NULL) {
RecordComment("Abort message: ");
RecordComment(msg);
}
if (FLAG_trap_on_abort) {
int3();
return;
}
#endif
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 TurboAssembler::CallStubDelayed(CodeStub* stub) {
DCHECK(AllowThisStubCall(stub)); // Calls are not allowed in some stubs
call(stub);
}
void MacroAssembler::CallStub(CodeStub* stub) {
DCHECK(AllowThisStubCall(stub)); // Calls are not allowed in some stubs
Call(stub->GetCode(), RelocInfo::CODE_TARGET);
}
void MacroAssembler::TailCallStub(CodeStub* stub) {
Jump(stub->GetCode(), RelocInfo::CODE_TARGET);
}
bool TurboAssembler::AllowThisStubCall(CodeStub* stub) {
return has_frame() || !stub->SometimesSetsUpAFrame();
}
void TurboAssembler::CallRuntimeDelayed(Zone* zone, Runtime::FunctionId fid,
SaveFPRegsMode save_doubles) {
const Runtime::Function* f = Runtime::FunctionForId(fid);
// 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, f->nargs);
LoadAddress(rbx, ExternalReference(f, isolate()));
CallStubDelayed(new (zone) CEntryStub(nullptr, f->result_size, save_doubles));
}
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(f, isolate()));
CEntryStub ces(isolate(), f->result_size, save_doubles);
CallStub(&ces);
}
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(fid, isolate()));
}
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);
CEntryStub ces(isolate(), 1, kDontSaveFPRegs, kArgvOnStack,
builtin_exit_frame);
jmp(ces.GetCode(), 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 += kPointerSize;
}
}
// 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 += kPointerSize;
}
}
// R12 to r15 are callee save on all platforms.
if (fp_mode == kSaveFPRegs) {
int delta = kDoubleSize * XMMRegister::kNumRegisters;
subp(rsp, Immediate(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;
addp(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 += kPointerSize;
}
}
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, const 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, const 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);
vxorpd(dst, dst, dst);
vcvtlsi2sd(dst, dst, src);
} else {
xorpd(dst, dst);
cvtlsi2sd(dst, src);
}
}
void TurboAssembler::Cvtlsi2sd(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorpd(dst, dst, dst);
vcvtlsi2sd(dst, dst, src);
} else {
xorpd(dst, dst);
cvtlsi2sd(dst, src);
}
}
void TurboAssembler::Cvtlsi2ss(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorps(dst, dst, dst);
vcvtlsi2ss(dst, dst, src);
} else {
xorps(dst, dst);
cvtlsi2ss(dst, src);
}
}
void TurboAssembler::Cvtlsi2ss(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorps(dst, dst, dst);
vcvtlsi2ss(dst, dst, src);
} else {
xorps(dst, dst);
cvtlsi2ss(dst, src);
}
}
void TurboAssembler::Cvtqsi2ss(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorps(dst, dst, dst);
vcvtqsi2ss(dst, dst, src);
} else {
xorps(dst, dst);
cvtqsi2ss(dst, src);
}
}
void TurboAssembler::Cvtqsi2ss(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorps(dst, dst, dst);
vcvtqsi2ss(dst, dst, src);
} else {
xorps(dst, dst);
cvtqsi2ss(dst, src);
}
}
void TurboAssembler::Cvtqsi2sd(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorpd(dst, dst, dst);
vcvtqsi2sd(dst, dst, src);
} else {
xorpd(dst, dst);
cvtqsi2sd(dst, src);
}
}
void TurboAssembler::Cvtqsi2sd(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorpd(dst, dst, dst);
vcvtqsi2sd(dst, dst, src);
} else {
xorpd(dst, dst);
cvtqsi2sd(dst, src);
}
}
void TurboAssembler::Cvtqui2ss(XMMRegister dst, Register src, Register tmp) {
Label msb_set_src;
Label jmp_return;
testq(src, src);
j(sign, &msb_set_src, Label::kNear);
Cvtqsi2ss(dst, src);
jmp(&jmp_return, Label::kNear);
bind(&msb_set_src);
movq(tmp, src);
shrq(src, Immediate(1));
// Recover the least significant bit to avoid rounding errors.
andq(tmp, Immediate(1));
orq(src, tmp);
Cvtqsi2ss(dst, src);
addss(dst, dst);
bind(&jmp_return);
}
void TurboAssembler::Cvtqui2sd(XMMRegister dst, Register src, Register tmp) {
Label msb_set_src;
Label jmp_return;
testq(src, src);
j(sign, &msb_set_src, Label::kNear);
Cvtqsi2sd(dst, src);
jmp(&jmp_return, Label::kNear);
bind(&msb_set_src);
movq(tmp, src);
shrq(src, Immediate(1));
andq(tmp, Immediate(1));
orq(src, tmp);
Cvtqsi2sd(dst, src);
addsd(dst, dst);
bind(&jmp_return);
}
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, const 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, const 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, const 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, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vcvttsd2siq(dst, src);
} else {
cvttsd2siq(dst, src);
}
}
void MacroAssembler::Load(Register dst, const Operand& src, Representation r) {
DCHECK(!r.IsDouble());
if (r.IsInteger8()) {
movsxbq(dst, src);
} else if (r.IsUInteger8()) {
movzxbl(dst, src);
} else if (r.IsInteger16()) {
movsxwq(dst, src);
} else if (r.IsUInteger16()) {
movzxwl(dst, src);
} else if (r.IsInteger32()) {
movl(dst, src);
} else {
movp(dst, src);
}
}
void MacroAssembler::Store(const Operand& dst, Register src, Representation r) {
DCHECK(!r.IsDouble());
if (r.IsInteger8() || r.IsUInteger8()) {
movb(dst, src);
} else if (r.IsInteger16() || r.IsUInteger16()) {
movw(dst, src);
} else if (r.IsInteger32()) {
movl(dst, src);
} else {
if (r.IsHeapObject()) {
AssertNotSmi(src);
} else if (r.IsSmi()) {
AssertSmi(src);
}
movp(dst, src);
}
}
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(const Operand& dst, intptr_t x) {
if (kPointerSize == kInt64Size) {
if (is_int32(x)) {
movp(dst, Immediate(static_cast<int32_t>(x)));
} else {
Set(kScratchRegister, x);
movp(dst, kScratchRegister);
}
} else {
movp(dst, Immediate(static_cast<int32_t>(x)));
}
}
// ----------------------------------------------------------------------------
// 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;
}
Move(kScratchRegister, 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, Assembler::RelocInfoNone());
}
}
void MacroAssembler::Integer32ToSmi(Register dst, Register src) {
STATIC_ASSERT(kSmiTag == 0);
if (dst != src) {
movl(dst, src);
}
shlp(dst, Immediate(kSmiShift));
}
void TurboAssembler::SmiToInteger32(Register dst, Register src) {
STATIC_ASSERT(kSmiTag == 0);
if (dst != src) {
movp(dst, src);
}
if (SmiValuesAre32Bits()) {
shrp(dst, Immediate(kSmiShift));
} else {
DCHECK(SmiValuesAre31Bits());
sarl(dst, Immediate(kSmiShift));
}
}
void TurboAssembler::SmiToInteger32(Register dst, const Operand& src) {
if (SmiValuesAre32Bits()) {
movl(dst, Operand(src, kSmiShift / kBitsPerByte));
} else {
DCHECK(SmiValuesAre31Bits());
movl(dst, src);
sarl(dst, Immediate(kSmiShift));
}
}
void MacroAssembler::SmiToInteger64(Register dst, Register src) {
STATIC_ASSERT(kSmiTag == 0);
if (dst != src) {
movp(dst, src);
}
sarp(dst, Immediate(kSmiShift));
if (kPointerSize == kInt32Size) {
// Sign extend to 64-bit.
movsxlq(dst, dst);
}
}
void MacroAssembler::SmiToInteger64(Register dst, const Operand& src) {
if (SmiValuesAre32Bits()) {
movsxlq(dst, Operand(src, kSmiShift / kBitsPerByte));
} else {
DCHECK(SmiValuesAre31Bits());
movp(dst, src);
SmiToInteger64(dst, dst);
}
}
void MacroAssembler::SmiTest(Register src) {
AssertSmi(src);
testp(src, src);
}
void MacroAssembler::SmiCompare(Register smi1, Register smi2) {
AssertSmi(smi1);
AssertSmi(smi2);
cmpp(smi1, smi2);
}
void MacroAssembler::SmiCompare(Register dst, Smi* src) {
AssertSmi(dst);
Cmp(dst, src);
}
void MacroAssembler::Cmp(Register dst, Smi* src) {
DCHECK(dst != kScratchRegister);
if (src->value() == 0) {
testp(dst, dst);
} else {
Register constant_reg = GetSmiConstant(src);
cmpp(dst, constant_reg);
}
}
void MacroAssembler::SmiCompare(Register dst, const Operand& src) {
AssertSmi(dst);
AssertSmi(src);
cmpp(dst, src);
}
void MacroAssembler::SmiCompare(const Operand& dst, Register src) {
AssertSmi(dst);
AssertSmi(src);
cmpp(dst, src);
}
void MacroAssembler::SmiCompare(const 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(const Operand& dst, Smi* src) {
// The Operand cannot use the smi register.
Register smi_reg = GetSmiConstant(src);
DCHECK(!dst.AddressUsesRegister(smi_reg));
cmpp(dst, smi_reg);
}
void MacroAssembler::PositiveSmiTimesPowerOfTwoToInteger64(Register dst,
Register src,
int power) {
DCHECK(power >= 0);
DCHECK(power < 64);
if (power == 0) {
SmiToInteger64(dst, src);
return;
}
if (dst != src) {
movp(dst, src);
}
if (power < kSmiShift) {
sarp(dst, Immediate(kSmiShift - power));
} else if (power > kSmiShift) {
shlp(dst, Immediate(power - kSmiShift));
}
}
Condition TurboAssembler::CheckSmi(Register src) {
STATIC_ASSERT(kSmiTag == 0);
testb(src, Immediate(kSmiTagMask));
return zero;
}
Condition TurboAssembler::CheckSmi(const Operand& src) {
STATIC_ASSERT(kSmiTag == 0);
testb(src, Immediate(kSmiTagMask));
return zero;
}
Condition MacroAssembler::CheckBothSmi(Register first, Register second) {
if (first == second) {
return CheckSmi(first);
}
STATIC_ASSERT(kSmiTag == 0 && kHeapObjectTag == 1 && kHeapObjectTagMask == 3);
if (SmiValuesAre32Bits()) {
leal(kScratchRegister, Operand(first, second, times_1, 0));
testb(kScratchRegister, Immediate(0x03));
} else {
DCHECK(SmiValuesAre31Bits());
movl(kScratchRegister, first);
orl(kScratchRegister, second);
testb(kScratchRegister, Immediate(kSmiTagMask));
}
return zero;
}
Condition MacroAssembler::CheckEitherSmi(Register first,
Register second,
Register scratch) {
if (first == second) {
return CheckSmi(first);
}
if (scratch == second) {
andl(scratch, first);
} else {
if (scratch != first) {
movl(scratch, first);
}
andl(scratch, second);
}
testb(scratch, 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::JumpIfNotBothSmi(Register src1,
Register src2,
Label* on_not_both_smi,
Label::Distance near_jump) {
Condition both_smi = CheckBothSmi(src1, src2);
j(NegateCondition(both_smi), on_not_both_smi, near_jump);
}
void MacroAssembler::SmiAddConstant(Register dst, Register src, Smi* constant) {
if (constant->value() == 0) {
if (dst != src) {
movp(dst, src);
}
return;
} else if (dst == src) {
DCHECK(dst != kScratchRegister);
Register constant_reg = GetSmiConstant(constant);
addp(dst, constant_reg);
} else {
Move(dst, constant);
addp(dst, src);
}
}
void MacroAssembler::SmiAddConstant(const Operand& dst, Smi* constant) {
if (constant->value() != 0) {
if (SmiValuesAre32Bits()) {
addl(Operand(dst, kSmiShift / kBitsPerByte),
Immediate(constant->value()));
} else {
DCHECK(SmiValuesAre31Bits());
addp(dst, Immediate(constant));
}
}
}
void MacroAssembler::SmiAddConstant(Register dst, Register src, Smi* constant,
SmiOperationConstraints constraints,
Label* bailout_label,
Label::Distance near_jump) {
if (constant->value() == 0) {
if (dst != src) {
movp(dst, src);
}
} else if (dst == src) {
DCHECK(dst != kScratchRegister);
Move(kScratchRegister, constant);
addp(dst, kScratchRegister);
if (constraints & SmiOperationConstraint::kBailoutOnNoOverflow) {
j(no_overflow, bailout_label, near_jump);
DCHECK(constraints & SmiOperationConstraint::kPreserveSourceRegister);
subp(dst, kScratchRegister);
} else if (constraints & SmiOperationConstraint::kBailoutOnOverflow) {
if (constraints & SmiOperationConstraint::kPreserveSourceRegister) {
Label done;
j(no_overflow, &done, Label::kNear);
subp(dst, kScratchRegister);
jmp(bailout_label, near_jump);
bind(&done);
} else {
// Bailout if overflow without reserving src.
j(overflow, bailout_label, near_jump);
}
} else {
UNREACHABLE();
}
} else {
DCHECK(constraints & SmiOperationConstraint::kPreserveSourceRegister);
DCHECK(constraints & SmiOperationConstraint::kBailoutOnOverflow);
Move(dst, constant);
addp(dst, src);
j(overflow, bailout_label, near_jump);
}
}
void MacroAssembler::SmiSubConstant(Register dst, Register src, Smi* constant) {
if (constant->value() == 0) {
if (dst != src) {
movp(dst, src);
}
} else if (dst == src) {
DCHECK(dst != kScratchRegister);
Register constant_reg = GetSmiConstant(constant);
subp(dst, constant_reg);
} else {
if (constant->value() == Smi::kMinValue) {
Move(dst, constant);
// Adding and subtracting the min-value gives the same result, it only
// differs on the overflow bit, which we don't check here.
addp(dst, src);
} else {
// Subtract by adding the negation.
Move(dst, Smi::FromInt(-constant->value()));
addp(dst, src);
}
}
}
void MacroAssembler::SmiSubConstant(Register dst, Register src, Smi* constant,
SmiOperationConstraints constraints,
Label* bailout_label,
Label::Distance near_jump) {
if (constant->value() == 0) {
if (dst != src) {
movp(dst, src);
}
} else if (dst == src) {
DCHECK(dst != kScratchRegister);
Move(kScratchRegister, constant);
subp(dst, kScratchRegister);
if (constraints & SmiOperationConstraint::kBailoutOnNoOverflow) {
j(no_overflow, bailout_label, near_jump);
DCHECK(constraints & SmiOperationConstraint::kPreserveSourceRegister);
addp(dst, kScratchRegister);
} else if (constraints & SmiOperationConstraint::kBailoutOnOverflow) {
if (constraints & SmiOperationConstraint::kPreserveSourceRegister) {
Label done;
j(no_overflow, &done, Label::kNear);
addp(dst, kScratchRegister);
jmp(bailout_label, near_jump);
bind(&done);
} else {
// Bailout if overflow without reserving src.
j(overflow, bailout_label, near_jump);
}
} else {
UNREACHABLE();
}
} else {
DCHECK(constraints & SmiOperationConstraint::kPreserveSourceRegister);
DCHECK(constraints & SmiOperationConstraint::kBailoutOnOverflow);
if (constant->value() == Smi::kMinValue) {
DCHECK(dst != kScratchRegister);
movp(dst, src);
Move(kScratchRegister, constant);
subp(dst, kScratchRegister);
j(overflow, bailout_label, near_jump);
} else {
// Subtract by adding the negation.
Move(dst, Smi::FromInt(-(constant->value())));
addp(dst, src);
j(overflow, bailout_label, near_jump);
}
}
}
template<class T>
static void SmiAddHelper(MacroAssembler* masm,
Register dst,
Register src1,
T src2,
Label* on_not_smi_result,
Label::Distance near_jump) {
if (dst == src1) {
Label done;
masm->addp(dst, src2);
masm->j(no_overflow, &done, Label::kNear);
// Restore src1.
masm->subp(dst, src2);
masm->jmp(on_not_smi_result, near_jump);
masm->bind(&done);
} else {
masm->movp(dst, src1);
masm->addp(dst, src2);
masm->j(overflow, on_not_smi_result, near_jump);
}
}
void MacroAssembler::SmiAdd(Register dst,
Register src1,
Register src2,
Label* on_not_smi_result,
Label::Distance near_jump) {
DCHECK_NOT_NULL(on_not_smi_result);
DCHECK(dst != src2);
SmiAddHelper<Register>(this, dst, src1, src2, on_not_smi_result, near_jump);
}
void MacroAssembler::SmiAdd(Register dst,
Register src1,
const Operand& src2,
Label* on_not_smi_result,
Label::Distance near_jump) {
DCHECK_NOT_NULL(on_not_smi_result);
DCHECK(!src2.AddressUsesRegister(dst));
SmiAddHelper<Operand>(this, dst, src1, src2, on_not_smi_result, near_jump);
}
void MacroAssembler::SmiAdd(Register dst,
Register src1,
Register src2) {
// No overflow checking. Use only when it's known that
// overflowing is impossible.
if (dst != src1) {
if (emit_debug_code()) {
movp(kScratchRegister, src1);
addp(kScratchRegister, src2);
Check(no_overflow, kSmiAdditionOverflow);
}
leap(dst, Operand(src1, src2, times_1, 0));
} else {
addp(dst, src2);
Assert(no_overflow, kSmiAdditionOverflow);
}
}
template<class T>
static void SmiSubHelper(MacroAssembler* masm,
Register dst,
Register src1,
T src2,
Label* on_not_smi_result,
Label::Distance near_jump) {
if (dst == src1) {
Label done;
masm->subp(dst, src2);
masm->j(no_overflow, &done, Label::kNear);
// Restore src1.
masm->addp(dst, src2);
masm->jmp(on_not_smi_result, near_jump);
masm->bind(&done);
} else {
masm->movp(dst, src1);
masm->subp(dst, src2);
masm->j(overflow, on_not_smi_result, near_jump);
}
}
void MacroAssembler::SmiSub(Register dst,
Register src1,
Register src2,
Label* on_not_smi_result,
Label::Distance near_jump) {
DCHECK_NOT_NULL(on_not_smi_result);
DCHECK(dst != src2);
SmiSubHelper<Register>(this, dst, src1, src2, on_not_smi_result, near_jump);
}
void MacroAssembler::SmiSub(Register dst,
Register src1,
const Operand& src2,
Label* on_not_smi_result,
Label::Distance near_jump) {
DCHECK_NOT_NULL(on_not_smi_result);
DCHECK(!src2.AddressUsesRegister(dst));
SmiSubHelper<Operand>(this, dst, src1, src2, on_not_smi_result, near_jump);
}
template<class T>
static void SmiSubNoOverflowHelper(MacroAssembler* masm,
Register dst,
Register src1,
T src2) {
// No overflow checking. Use only when it's known that
// overflowing is impossible (e.g., subtracting two positive smis).
if (dst != src1) {
masm->movp(dst, src1);
}
masm->subp(dst, src2);
masm->Assert(no_overflow, kSmiSubtractionOverflow);
}
void MacroAssembler::SmiSub(Register dst, Register src1, Register src2) {
DCHECK(dst != src2);
SmiSubNoOverflowHelper<Register>(this, dst, src1, src2);
}
void MacroAssembler::SmiSub(Register dst,
Register src1,
const Operand& src2) {
SmiSubNoOverflowHelper<Operand>(this, dst, src1, src2);
}
void MacroAssembler::SelectNonSmi(Register dst,
Register src1,
Register src2,
Label* on_not_smis,
Label::Distance near_jump) {
DCHECK(dst != kScratchRegister);
DCHECK(src1 != kScratchRegister);
DCHECK(src2 != kScratchRegister);
DCHECK(dst != src1);
DCHECK(dst != src2);
// Both operands must not be smis.
#ifdef DEBUG
Condition not_both_smis = NegateCondition(CheckBothSmi(src1, src2));
Check(not_both_smis, kBothRegistersWereSmisInSelectNonSmi);
#endif
STATIC_ASSERT(kSmiTag == 0);
DCHECK_EQ(static_cast<Smi*>(0), Smi::kZero);
movl(kScratchRegister, Immediate(kSmiTagMask));
andp(kScratchRegister, src1);
testl(kScratchRegister, src2);
// If non-zero then both are smis.
j(not_zero, on_not_smis, near_jump);
// Exactly one operand is a smi.
DCHECK_EQ(1, static_cast<int>(kSmiTagMask));
// kScratchRegister still holds src1 & kSmiTag, which is either zero or one.
subp(kScratchRegister, Immediate(1));
// If src1 is a smi, then scratch register all 1s, else it is all 0s.
movp(dst, src1);
xorp(dst, src2);
andp(dst, kScratchRegister);
// If src1 is a smi, dst holds src1 ^ src2, else it is zero.
xorp(dst, src1);
// If src1 is a smi, dst is src2, else it is src1, i.e., the non-smi.
}
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) {
movp(dst, src);
}
if (shift < kSmiShift) {
sarp(dst, Immediate(kSmiShift - shift));
} else {
shlp(dst, Immediate(shift - kSmiShift));
}
return SmiIndex(dst, times_1);
} else {
DCHECK(SmiValuesAre31Bits());
DCHECK(shift >= times_1 && shift <= (static_cast<int>(times_8) + 1));
if (dst != src) {
movp(dst, src);
}
// We have to sign extend the index register to 64-bit as the SMI might
// be negative.
movsxlq(dst, dst);
if (shift == times_1) {
sarq(dst, Immediate(kSmiShift));
return SmiIndex(dst, times_1);
}
return SmiIndex(dst, static_cast<ScaleFactor>(shift - 1));
}
}
void TurboAssembler::Push(Smi* source) {
intptr_t smi = reinterpret_cast<intptr_t>(source);
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 && kPointerSize == kInt64Size) {
// 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 MacroAssembler::JumpIfNotBothSequentialOneByteStrings(
Register first_object, Register second_object, Register scratch1,
Register scratch2, Label* on_fail, Label::Distance near_jump) {
// Check that both objects are not smis.
Condition either_smi = CheckEitherSmi(first_object, second_object);
j(either_smi, on_fail, near_jump);
// Load instance type for both strings.
movp(scratch1, FieldOperand(first_object, HeapObject::kMapOffset));
movp(scratch2, FieldOperand(second_object, HeapObject::kMapOffset));
movzxbl(scratch1, FieldOperand(scratch1, Map::kInstanceTypeOffset));
movzxbl(scratch2, FieldOperand(scratch2, Map::kInstanceTypeOffset));
// Check that both are flat one-byte strings.
DCHECK(kNotStringTag != 0);
const int kFlatOneByteStringMask =
kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask;
const int kFlatOneByteStringTag =
kStringTag | kOneByteStringTag | kSeqStringTag;
andl(scratch1, Immediate(kFlatOneByteStringMask));
andl(scratch2, Immediate(kFlatOneByteStringMask));
// Interleave the bits to check both scratch1 and scratch2 in one test.
const int kShift = 8;
DCHECK_EQ(0, kFlatOneByteStringMask & (kFlatOneByteStringMask << kShift));
shlp(scratch2, Immediate(kShift));
orp(scratch1, scratch2);
cmpl(scratch1,
Immediate(kFlatOneByteStringTag + (kFlatOneByteStringTag << kShift)));
j(not_equal, on_fail, near_jump);
}
void MacroAssembler::JumpIfBothInstanceTypesAreNotSequentialOneByte(
Register first_object_instance_type, Register second_object_instance_type,
Register scratch1, Register scratch2, Label* on_fail,
Label::Distance near_jump) {
// Load instance type for both strings.
movp(scratch1, first_object_instance_type);
movp(scratch2, second_object_instance_type);
// Check that both are flat one-byte strings.
DCHECK(kNotStringTag != 0);
const int kFlatOneByteStringMask =
kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask;
const int kFlatOneByteStringTag =
kStringTag | kOneByteStringTag | kSeqStringTag;
andl(scratch1, Immediate(kFlatOneByteStringMask));
andl(scratch2, Immediate(kFlatOneByteStringMask));
// Interleave the bits to check both scratch1 and scratch2 in one test.
DCHECK_EQ(0, kFlatOneByteStringMask & (kFlatOneByteStringMask << 3));
leap(scratch1, Operand(scratch1, scratch2, times_8, 0));
cmpl(scratch1,
Immediate(kFlatOneByteStringTag + (kFlatOneByteStringTag << 3)));
j(not_equal, on_fail, near_jump);
}
template<class T>
static void JumpIfNotUniqueNameHelper(MacroAssembler* masm,
T operand_or_register,
Label* not_unique_name,
Label::Distance distance) {
STATIC_ASSERT(kInternalizedTag == 0 && kStringTag == 0);
Label succeed;
masm->testb(operand_or_register,
Immediate(kIsNotStringMask | kIsNotInternalizedMask));
masm->j(zero, &succeed, Label::kNear);
masm->cmpb(operand_or_register, Immediate(static_cast<uint8_t>(SYMBOL_TYPE)));
masm->j(not_equal, not_unique_name, distance);
masm->bind(&succeed);
}
void MacroAssembler::JumpIfNotUniqueNameInstanceType(Operand operand,
Label* not_unique_name,
Label::Distance distance) {
JumpIfNotUniqueNameHelper<Operand>(this, operand, not_unique_name, distance);
}
void MacroAssembler::JumpIfNotUniqueNameInstanceType(Register reg,
Label* not_unique_name,
Label::Distance distance) {
JumpIfNotUniqueNameHelper<Register>(this, reg, not_unique_name, distance);
}
void TurboAssembler::Move(Register dst, Register src) {
if (dst != src) {
movp(dst, src);
}
}
void TurboAssembler::MoveNumber(Register dst, double value) {
int32_t smi;
if (DoubleToSmiInteger(value, &smi)) {
Move(dst, Smi::FromInt(smi));
} else {
movp_heap_number(dst, value);
}
}
void TurboAssembler::Move(XMMRegister dst, uint32_t src) {
if (src == 0) {
Xorpd(dst, dst);
} else {
unsigned pop = base::bits::CountPopulation32(src);
DCHECK_NE(0u, pop);
if (pop == 32) {
Pcmpeqd(dst, dst);
} else {
movl(kScratchRegister, Immediate(src));
Movq(dst, kScratchRegister);
}
}
}
void TurboAssembler::Move(XMMRegister dst, uint64_t src) {
if (src == 0) {
Xorpd(dst, dst);
} else {
unsigned nlz = base::bits::CountLeadingZeros64(src);
unsigned ntz = base::bits::CountTrailingZeros64(src);
unsigned pop = base::bits::CountPopulation64(src);
DCHECK_NE(0u, pop);
if (pop == 64) {
Pcmpeqd(dst, dst);
} else if (pop + ntz == 64) {
Pcmpeqd(dst, dst);
Psllq(dst, ntz);
} else if (pop + nlz == 64) {
Pcmpeqd(dst, dst);
Psrlq(dst, 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::Movaps(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovaps(dst, src);
} else {
movaps(dst, src);
}
}
void TurboAssembler::Movups(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovups(dst, src);
} else {
movups(dst, src);
}
}
void TurboAssembler::Movups(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovups(dst, src);
} else {
movups(dst, src);
}
}
void TurboAssembler::Movups(const Operand& dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovups(dst, src);
} else {
movups(dst, src);
}
}
void TurboAssembler::Movapd(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovapd(dst, src);
} else {
movapd(dst, src);
}
}
void TurboAssembler::Movsd(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovsd(dst, dst, src);
} else {
movsd(dst, src);
}
}
void TurboAssembler::Movsd(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovsd(dst, src);
} else {
movsd(dst, src);
}
}
void TurboAssembler::Movsd(const Operand& dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovsd(dst, src);
} else {
movsd(dst, src);
}
}
void TurboAssembler::Movss(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovss(dst, dst, src);
} else {
movss(dst, src);
}
}
void TurboAssembler::Movss(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovss(dst, src);
} else {
movss(dst, src);
}
}
void TurboAssembler::Movss(const Operand& dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovss(dst, src);
} else {
movss(dst, src);
}
}
void TurboAssembler::Movd(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovd(dst, src);
} else {
movd(dst, src);
}
}
void TurboAssembler::Movd(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovd(dst, src);
} else {
movd(dst, src);
}
}
void TurboAssembler::Movd(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovd(dst, src);
} else {
movd(dst, src);
}
}
void TurboAssembler::Movq(XMMRegister dst, Register src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovq(dst, src);
} else {
movq(dst, src);
}
}
void TurboAssembler::Movq(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovq(dst, src);
} else {
movq(dst, src);
}
}
void TurboAssembler::Movmskps(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovmskps(dst, src);
} else {
movmskps(dst, src);
}
}
void TurboAssembler::Movmskpd(Register dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vmovmskpd(dst, src);
} else {
movmskpd(dst, src);
}
}
void TurboAssembler::Xorps(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorps(dst, dst, src);
} else {
xorps(dst, src);
}
}
void TurboAssembler::Xorps(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vxorps(dst, dst, src);
} else {
xorps(dst, src);
}
}
void TurboAssembler::Roundss(XMMRegister dst, XMMRegister src,
RoundingMode mode) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vroundss(dst, dst, src, mode);
} else {
roundss(dst, src, mode);
}
}
void TurboAssembler::Roundsd(XMMRegister dst, XMMRegister src,
RoundingMode mode) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vroundsd(dst, dst, src, mode);
} else {
roundsd(dst, src, mode);
}
}
void TurboAssembler::Sqrtsd(XMMRegister dst, XMMRegister src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vsqrtsd(dst, dst, src);
} else {
sqrtsd(dst, src);
}
}
void TurboAssembler::Sqrtsd(XMMRegister dst, const Operand& src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vsqrtsd(dst, dst, src);
} else {
sqrtsd(dst, src);
}
}
void TurboAssembler::Ucomiss(XMMRegister src1, XMMRegister src2) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vucomiss(src1, src2);
} else {
ucomiss(src1, src2);
}
}
void TurboAssembler::Ucomiss(XMMRegister src1, const Operand& src2) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vucomiss(src1, src2);
} else {
ucomiss(src1, src2);
}
}
void TurboAssembler::Ucomisd(XMMRegister src1, XMMRegister src2) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vucomisd(src1, src2);
} else {
ucomisd(src1, src2);
}
}
void TurboAssembler::Ucomisd(XMMRegister src1, const Operand& src2) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vucomisd(src1, src2);
} else {
ucomisd(src1, src2);
}
}
// ----------------------------------------------------------------------------
void MacroAssembler::Absps(XMMRegister dst) {
Andps(dst,
ExternalOperand(ExternalReference::address_of_float_abs_constant()));
}
void MacroAssembler::Negps(XMMRegister dst) {
Xorps(dst,
ExternalOperand(ExternalReference::address_of_float_neg_constant()));
}
void MacroAssembler::Abspd(XMMRegister dst) {
Andps(dst,
ExternalOperand(ExternalReference::address_of_double_abs_constant()));
}
void MacroAssembler::Negpd(XMMRegister dst) {
Xorps(dst,
ExternalOperand(ExternalReference::address_of_double_neg_constant()));
}
void MacroAssembler::Cmp(Register dst, Handle<Object> source) {
AllowDeferredHandleDereference smi_check;
if (source->IsSmi()) {
Cmp(dst, Smi::cast(*source));
} else {
Move(kScratchRegister, Handle<HeapObject>::cast(source));
cmpp(dst, kScratchRegister);
}
}
void MacroAssembler::Cmp(const Operand& dst, Handle<Object> source) {
AllowDeferredHandleDereference smi_check;
if (source->IsSmi()) {
Cmp(dst, Smi::cast(*source));
} else {
Move(kScratchRegister, Handle<HeapObject>::cast(source));
cmpp(dst, kScratchRegister);
}
}
void TurboAssembler::Push(Handle<HeapObject> source) {
Move(kScratchRegister, source);
Push(kScratchRegister);
}
void TurboAssembler::Move(Register result, Handle<HeapObject> object,
RelocInfo::Mode rmode) {
movp(result, reinterpret_cast<void*>(object.address()), rmode);
}
void TurboAssembler::Move(const Operand& dst, Handle<HeapObject> object,
RelocInfo::Mode rmode) {
Move(kScratchRegister, object, rmode);
movp(dst, kScratchRegister);
}
void MacroAssembler::GetWeakValue(Register value, Handle<WeakCell> cell) {
Move(value, cell, RelocInfo::EMBEDDED_OBJECT);
movp(value, FieldOperand(value, WeakCell::kValueOffset));
}
void MacroAssembler::LoadWeakValue(Register value, Handle<WeakCell> cell,
Label* miss) {
GetWeakValue(value, cell);
JumpIfSmi(value, miss);
}
void MacroAssembler::Drop(int stack_elements) {
if (stack_elements > 0) {
addp(rsp, Immediate(stack_elements * kPointerSize));
}
}
void MacroAssembler::DropUnderReturnAddress(int stack_elements,
Register scratch) {
DCHECK(stack_elements > 0);
if (kPointerSize == kInt64Size && stack_elements == 1) {
popq(MemOperand(rsp, 0));
return;
}
PopReturnAddressTo(scratch);
Drop(stack_elements);
PushReturnAddressFrom(scratch);
}
void TurboAssembler::Push(Register src) {
if (kPointerSize == kInt64Size) {
pushq(src);
} else {
// x32 uses 64-bit push for rbp in the prologue.
DCHECK(src.code() != rbp.code());
leal(rsp, Operand(rsp, -4));
movp(Operand(rsp, 0), src);
}
}
void TurboAssembler::Push(const Operand& src) {
if (kPointerSize == kInt64Size) {
pushq(src);
} else {
movp(kScratchRegister, src);
leal(rsp, Operand(rsp, -4));
movp(Operand(rsp, 0), kScratchRegister);
}
}
void MacroAssembler::PushQuad(const Operand& src) {
if (kPointerSize == kInt64Size) {
pushq(src);
} else {
movp(kScratchRegister, src);
pushq(kScratchRegister);
}
}
void TurboAssembler::Push(Immediate value) {
if (kPointerSize == kInt64Size) {
pushq(value);
} else {
leal(rsp, Operand(rsp, -4));
movp(Operand(rsp, 0), value);
}
}
void MacroAssembler::PushImm32(int32_t imm32) {
if (kPointerSize == kInt64Size) {
pushq_imm32(imm32);
} else {
leal(rsp, Operand(rsp, -4));
movp(Operand(rsp, 0), Immediate(imm32));
}
}
void MacroAssembler::Pop(Register dst) {
if (kPointerSize == kInt64Size) {
popq(dst);
} else {
// x32 uses 64-bit pop for rbp in the epilogue.
DCHECK(dst.code() != rbp.code());
movp(dst, Operand(rsp, 0));
leal(rsp, Operand(rsp, 4));
}
}
void MacroAssembler::Pop(const Operand& dst) {
if (kPointerSize == kInt64Size) {
popq(dst);
} else {
Register scratch = dst.AddressUsesRegister(kScratchRegister)
? kRootRegister : kScratchRegister;
movp(scratch, Operand(rsp, 0));
movp(dst, scratch);
leal(rsp, Operand(rsp, 4));
if (scratch == kRootRegister) {
// Restore kRootRegister.
InitializeRootRegister();
}
}
}
void MacroAssembler::PopQuad(const Operand& dst) {
if (kPointerSize == kInt64Size) {
popq(dst);
} else {
popq(kScratchRegister);
movp(dst, kScratchRegister);
}
}
void MacroAssembler::Jump(ExternalReference ext) {
LoadAddress(kScratchRegister, ext);
jmp(kScratchRegister);
}
void MacroAssembler::Jump(const Operand& op) {
if (kPointerSize == kInt64Size) {
jmp(op);
} else {
movp(kScratchRegister, op);
jmp(kScratchRegister);
}
}
void MacroAssembler::Jump(Address destination, RelocInfo::Mode rmode) {
Move(kScratchRegister, destination, rmode);
jmp(kScratchRegister);
}
void MacroAssembler::Jump(Handle<Code> code_object, RelocInfo::Mode rmode) {
// TODO(X64): Inline this
jmp(code_object, rmode);
}
int TurboAssembler::CallSize(ExternalReference ext) {
// Opcode for call kScratchRegister is: Rex.B FF D4 (three bytes).
return LoadAddressSize(ext) +
Assembler::kCallScratchRegisterInstructionLength;
}
void TurboAssembler::Call(ExternalReference ext) {
#ifdef DEBUG
int end_position = pc_offset() + CallSize(ext);
#endif
LoadAddress(kScratchRegister, ext);
call(kScratchRegister);
#ifdef DEBUG
DCHECK_EQ(end_position, pc_offset());
#endif
}
void TurboAssembler::Call(const Operand& op) {
if (kPointerSize == kInt64Size && !CpuFeatures::IsSupported(ATOM)) {
call(op);
} else {
movp(kScratchRegister, op);
call(kScratchRegister);
}
}
void TurboAssembler::Call(Address destination, RelocInfo::Mode rmode) {
#ifdef DEBUG
int end_position = pc_offset() + CallSize(destination);
#endif
Move(kScratchRegister, destination, rmode);
call(kScratchRegister);
#ifdef DEBUG
DCHECK_EQ(pc_offset(), end_position);
#endif
}
void TurboAssembler::Call(Handle<Code> code_object, RelocInfo::Mode rmode) {
#ifdef DEBUG
int end_position = pc_offset() + CallSize(code_object);
#endif
DCHECK(RelocInfo::IsCodeTarget(rmode));
call(code_object, rmode);
#ifdef DEBUG
DCHECK_EQ(end_position, pc_offset());
#endif
}
void TurboAssembler::Pextrd(Register dst, XMMRegister src, int8_t imm8) {
if (imm8 == 0) {
Movd(dst, src);
return;
}
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));
}
void TurboAssembler::Pinsrd(XMMRegister dst, Register src, int8_t imm8) {
if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pinsrd(dst, src, imm8);
return;
}
Movd(kScratchDoubleReg, src);
if (imm8 == 1) {
punpckldq(dst, kScratchDoubleReg);
} else {
DCHECK_EQ(0, imm8);
Movss(dst, kScratchDoubleReg);
}
}
void TurboAssembler::Pinsrd(XMMRegister dst, const Operand& src, int8_t imm8) {
DCHECK(imm8 == 0 || imm8 == 1);
if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pinsrd(dst, src, imm8);
return;
}
Movd(kScratchDoubleReg, src);
if (imm8 == 1) {
punpckldq(dst, kScratchDoubleReg);
} else {
DCHECK_EQ(0, imm8);
Movss(dst, kScratchDoubleReg);
}
}
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);
Set(dst, 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, const 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);
Set(dst, 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);
Set(dst, 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, const 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);
Set(dst, 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.
Set(dst, 64);
bind(&not_zero_src);
}
void TurboAssembler::Tzcntq(Register dst, const 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.
Set(dst, 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);
Set(dst, 32); // The result of tzcnt is 32 if src = 0.
bind(&not_zero_src);
}
void TurboAssembler::Tzcntl(Register dst, const 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);
Set(dst, 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, const 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, const Operand& src) {
if (CpuFeatures::IsSupported(POPCNT)) {
CpuFeatureScope scope(this, POPCNT);
popcntq(dst, src);
return;
}
UNREACHABLE();
}
void MacroAssembler::Pushad() {
Push(rax);
Push(rcx);
Push(rdx);
Push(rbx);
// Not pushing rsp or rbp.
Push(rsi);
Push(rdi);
Push(r8);
Push(r9);
// r10 is kScratchRegister.
Push(r11);
Push(r12);
// r13 is kRootRegister.
Push(r14);
Push(r15);
STATIC_ASSERT(12 == kNumSafepointSavedRegisters);
// Use lea for symmetry with Popad.
int sp_delta =
(kNumSafepointRegisters - kNumSafepointSavedRegisters) * kPointerSize;
leap(rsp, Operand(rsp, -sp_delta));
}
void MacroAssembler::Popad() {
// Popad must not change the flags, so use lea instead of addq.
int sp_delta =
(kNumSafepointRegisters - kNumSafepointSavedRegisters) * kPointerSize;
leap(rsp, Operand(rsp, sp_delta));
Pop(r15);
Pop(r14);
Pop(r12);
Pop(r11);
Pop(r9);
Pop(r8);
Pop(rdi);
Pop(rsi);
Pop(rbx);
Pop(rdx);
Pop(rcx);
Pop(rax);
}
// 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 == 1 * kPointerSize);
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
// Link the current handler as the next handler.
ExternalReference handler_address(IsolateAddressId::kHandlerAddress,
isolate());
Push(ExternalOperand(handler_address));
// Set this new handler as the current one.
movp(ExternalOperand(handler_address), rsp);
}
void MacroAssembler::PopStackHandler() {
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
ExternalReference handler_address(IsolateAddressId::kHandlerAddress,
isolate());
Pop(ExternalOperand(handler_address));
addp(rsp, Immediate(StackHandlerConstants::kSize - kPointerSize));
}
void TurboAssembler::Ret() { ret(0); }
void TurboAssembler::Ret(int bytes_dropped, Register scratch) {
if (is_uint16(bytes_dropped)) {
ret(bytes_dropped);
} else {
PopReturnAddressTo(scratch);
addp(rsp, Immediate(bytes_dropped));
PushReturnAddressFrom(scratch);
ret(0);
}
}
void MacroAssembler::CmpObjectType(Register heap_object,
InstanceType type,
Register map) {
movp(map, FieldOperand(heap_object, HeapObject::kMapOffset));
CmpInstanceType(map, type);
}
void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
cmpb(FieldOperand(map, Map::kInstanceTypeOffset),
Immediate(static_cast<int8_t>(type)));
}
void MacroAssembler::CompareMap(Register obj, Handle<Map> map) {
Cmp(FieldOperand(obj, HeapObject::kMapOffset), map);
}
void MacroAssembler::CheckMap(Register obj,
Handle<Map> map,
Label* fail,
SmiCheckType smi_check_type) {
if (smi_check_type == DO_SMI_CHECK) {
JumpIfSmi(obj, fail);
}
CompareMap(obj, map);
j(not_equal, fail);
}
void TurboAssembler::SlowTruncateToIDelayed(Zone* zone, Register result_reg,
Register input_reg, int offset) {
CallStubDelayed(
new (zone) DoubleToIStub(nullptr, input_reg, result_reg, offset, true));
}
void MacroAssembler::DoubleToI(Register result_reg, XMMRegister input_reg,
XMMRegister scratch,
MinusZeroMode minus_zero_mode,
Label* lost_precision, Label* is_nan,
Label* minus_zero, Label::Distance dst) {
Cvttsd2si(result_reg, input_reg);
Cvtlsi2sd(kScratchDoubleReg, result_reg);
Ucomisd(kScratchDoubleReg, input_reg);
j(not_equal, lost_precision, dst);
j(parity_even, is_nan, dst); // NaN.
if (minus_zero_mode == FAIL_ON_MINUS_ZERO) {
Label done;
// The integer converted back is equal to the original. We
// only have to test if we got -0 as an input.
testl(result_reg, result_reg);
j(not_zero, &done, Label::kNear);
Movmskpd(result_reg, input_reg);
// Bit 0 contains the sign of the double in input_reg.
// If input was positive, we are ok and return 0, otherwise
// jump to minus_zero.
andl(result_reg, Immediate(1));
j(not_zero, minus_zero, dst);
bind(&done);
}
}
void MacroAssembler::LoadInstanceDescriptors(Register map,
Register descriptors) {
movp(descriptors, FieldOperand(map, Map::kDescriptorsOffset));
}
void MacroAssembler::LoadAccessor(Register dst, Register holder,
int accessor_index,
AccessorComponent accessor) {
movp(dst, FieldOperand(holder, HeapObject::kMapOffset));
LoadInstanceDescriptors(dst, dst);
movp(dst, FieldOperand(dst, DescriptorArray::GetValueOffset(accessor_index)));
int offset = accessor == ACCESSOR_GETTER ? AccessorPair::kGetterOffset
: AccessorPair::kSetterOffset;
movp(dst, FieldOperand(dst, offset));
}
void MacroAssembler::AssertNotSmi(Register object) {
if (emit_debug_code()) {
Condition is_smi = CheckSmi(object);
Check(NegateCondition(is_smi), kOperandIsASmi);
}
}
void MacroAssembler::AssertSmi(Register object) {
if (emit_debug_code()) {
Condition is_smi = CheckSmi(object);
Check(is_smi, kOperandIsNotASmi);
}
}
void MacroAssembler::AssertSmi(const Operand& object) {
if (emit_debug_code()) {
Condition is_smi = CheckSmi(object);
Check(is_smi, kOperandIsNotASmi);
}
}
void MacroAssembler::AssertFixedArray(Register object) {
if (emit_debug_code()) {
testb(object, Immediate(kSmiTagMask));
Check(not_equal, kOperandIsASmiAndNotAFixedArray);
Push(object);
CmpObjectType(object, FIXED_ARRAY_TYPE, object);
Pop(object);
Check(equal, kOperandIsNotAFixedArray);
}
}
void TurboAssembler::AssertZeroExtended(Register int32_register) {
if (emit_debug_code()) {
DCHECK(int32_register != kScratchRegister);
movq(kScratchRegister, V8_INT64_C(0x0000000100000000));
cmpq(kScratchRegister, int32_register);
Check(above_equal, k32BitValueInRegisterIsNotZeroExtended);
}
}
void MacroAssembler::AssertFunction(Register object) {
if (emit_debug_code()) {
testb(object, Immediate(kSmiTagMask));
Check(not_equal, kOperandIsASmiAndNotAFunction);
Push(object);
CmpObjectType(object, JS_FUNCTION_TYPE, object);
Pop(object);
Check(equal, kOperandIsNotAFunction);
}
}
void MacroAssembler::AssertBoundFunction(Register object) {
if (emit_debug_code()) {
testb(object, Immediate(kSmiTagMask));
Check(not_equal, kOperandIsASmiAndNotABoundFunction);
Push(object);
CmpObjectType(object, JS_BOUND_FUNCTION_TYPE, object);
Pop(object);
Check(equal, kOperandIsNotABoundFunction);
}
}
void MacroAssembler::AssertGeneratorObject(Register object) {
if (!emit_debug_code()) return;
testb(object, Immediate(kSmiTagMask));
Check(not_equal, kOperandIsASmiAndNotAGeneratorObject);
// Load map
Register map = object;
Push(object);
movp(map, FieldOperand(object, HeapObject::kMapOffset));
Label do_check;
// Check if JSGeneratorObject
CmpInstanceType(map, JS_GENERATOR_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, 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, kExpectedUndefinedOrCell);
bind(&done_checking);
}
}
void MacroAssembler::GetMapConstructor(Register result, Register map,
Register temp) {
Label done, loop;
movp(result, FieldOperand(map, Map::kConstructorOrBackPointerOffset));
bind(&loop);
JumpIfSmi(result, &done, Label::kNear);
CmpObjectType(result, MAP_TYPE, temp);
j(not_equal, &done, Label::kNear);
movp(result, FieldOperand(result, Map::kConstructorOrBackPointerOffset));
jmp(&loop);
bind(&done);
}
void MacroAssembler::SetCounter(StatsCounter* counter, int value) {
if (FLAG_native_code_counters && counter->Enabled()) {
Operand counter_operand = ExternalOperand(ExternalReference(counter));
movl(counter_operand, Immediate(value));
}
}
void MacroAssembler::IncrementCounter(StatsCounter* counter, int value) {
DCHECK(value > 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand counter_operand = ExternalOperand(ExternalReference(counter));
if (value == 1) {
incl(counter_operand);
} else {
addl(counter_operand, Immediate(value));
}
}
}
void MacroAssembler::DecrementCounter(StatsCounter* counter, int value) {
DCHECK(value > 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand counter_operand = ExternalOperand(ExternalReference(counter));
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);
testp(rbx, rbx);
j(not_zero, BUILTIN_CODE(isolate(), FrameDropperTrampoline),
RelocInfo::CODE_TARGET);
}
void TurboAssembler::PrepareForTailCall(const ParameterCount& callee_args_count,
Register caller_args_count_reg,
Register scratch0, Register scratch1,
ReturnAddressState ra_state) {
#if DEBUG
if (callee_args_count.is_reg()) {
DCHECK(!AreAliased(callee_args_count.reg(), caller_args_count_reg, scratch0,
scratch1));
} else {
DCHECK(!AreAliased(caller_args_count_reg, scratch0, scratch1));
}
#endif
// Calculate the destination address where we will put the return address
// after we drop current frame.
Register new_sp_reg = scratch0;
if (callee_args_count.is_reg()) {
subp(caller_args_count_reg, callee_args_count.reg());
leap(new_sp_reg, Operand(rbp, caller_args_count_reg, times_pointer_size,
StandardFrameConstants::kCallerPCOffset));
} else {
leap(new_sp_reg, Operand(rbp, caller_args_count_reg, times_pointer_size,
StandardFrameConstants::kCallerPCOffset -
callee_args_count.immediate() * kPointerSize));
}
if (FLAG_debug_code) {
cmpp(rsp, new_sp_reg);
Check(below, 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;
if (ra_state == ReturnAddressState::kOnStack) {
movp(tmp_reg, Operand(rbp, StandardFrameConstants::kCallerPCOffset));
movp(Operand(rsp, 0), tmp_reg);
} else {
DCHECK(ReturnAddressState::kNotOnStack == ra_state);
Push(Operand(rbp, StandardFrameConstants::kCallerPCOffset));
}
// Restore caller's frame pointer now as it could be overwritten by
// the copying loop.
movp(rbp, Operand(rbp, StandardFrameConstants::kCallerFPOffset));
// +2 here is to copy both receiver and return address.
Register count_reg = caller_args_count_reg;
if (callee_args_count.is_reg()) {
leap(count_reg, Operand(callee_args_count.reg(), 2));
} else {
movp(count_reg, Immediate(callee_args_count.immediate() + 2));
// TODO(ishell): Unroll copying loop for small immediate values.
}
// 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);
decp(count_reg);
movp(tmp_reg, Operand(rsp, count_reg, times_pointer_size, 0));
movp(Operand(new_sp_reg, count_reg, times_pointer_size, 0), tmp_reg);
bind(&entry);
cmpp(count_reg, Immediate(0));
j(not_equal, &loop, Label::kNear);
// Leave current frame.
movp(rsp, new_sp_reg);
}
void MacroAssembler::InvokeFunction(Register function, Register new_target,
const ParameterCount& actual,
InvokeFlag flag) {
movp(rbx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
movsxlq(rbx,
FieldOperand(rbx, SharedFunctionInfo::kFormalParameterCountOffset));
ParameterCount expected(rbx);
InvokeFunction(function, new_target, expected, actual, flag);
}
void MacroAssembler::InvokeFunction(Register function, Register new_target,
const ParameterCount& expected,
const ParameterCount& actual,
InvokeFlag flag) {
DCHECK(function == rdi);
movp(rsi, FieldOperand(function, JSFunction::kContextOffset));
InvokeFunctionCode(rdi, new_target, expected, actual, flag);
}
void MacroAssembler::InvokeFunctionCode(Register function, Register new_target,
const ParameterCount& expected,
const ParameterCount& actual,
InvokeFlag flag) {
// You can't call a function without a valid frame.
DCHECK(flag == JUMP_FUNCTION || has_frame());
DCHECK(function == rdi);
DCHECK_IMPLIES(new_target.is_valid(), new_target == rdx);
// On function call, call into the debugger if necessary.
CheckDebugHook(function, new_target, expected, actual);
// Clear the new.target register if not given.
if (!new_target.is_valid()) {
LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
}
Label done;
bool definitely_mismatches = false;
InvokePrologue(expected, actual, &done, &definitely_mismatches, flag,
Label::kNear);
if (!definitely_mismatches) {
// We call indirectly through the code field in the function to
// allow recompilation to take effect without changing any of the
// call sites.
movp(rcx, FieldOperand(function, JSFunction::kCodeOffset));
addp(rcx, Immediate(Code::kHeaderSize - kHeapObjectTag));
if (flag == CALL_FUNCTION) {
call(rcx);
} else {
DCHECK(flag == JUMP_FUNCTION);
jmp(rcx);
}
bind(&done);
}
}
void MacroAssembler::InvokePrologue(const ParameterCount& expected,
const ParameterCount& actual, Label* done,
bool* definitely_mismatches,
InvokeFlag flag,
Label::Distance near_jump) {
bool definitely_matches = false;
*definitely_mismatches = false;
Label invoke;
if (expected.is_immediate()) {
DCHECK(actual.is_immediate());
Set(rax, actual.immediate());
if (expected.immediate() == actual.immediate()) {
definitely_matches = true;
} else {
if (expected.immediate() ==
SharedFunctionInfo::kDontAdaptArgumentsSentinel) {
// Don't worry about adapting arguments for built-ins that
// don't want that done. Skip adaption code by making it look
// like we have a match between expected and actual number of
// arguments.
definitely_matches = true;
} else {
*definitely_mismatches = true;
Set(rbx, expected.immediate());
}
}
} else {
if (actual.is_immediate()) {
// Expected is in register, actual is immediate. This is the
// case when we invoke function values without going through the
// IC mechanism.
Set(rax, actual.immediate());
cmpp(expected.reg(), Immediate(actual.immediate()));
j(equal, &invoke, Label::kNear);
DCHECK(expected.reg() == rbx);
} else if (expected.reg() != actual.reg()) {
// Both expected and actual are in (different) registers. This
// is the case when we invoke functions using call and apply.
cmpp(expected.reg(), actual.reg());
j(equal, &invoke, Label::kNear);
DCHECK(actual.reg() == rax);
DCHECK(expected.reg() == rbx);
} else {
definitely_matches = true;
Move(rax, actual.reg());
}
}
if (!definitely_matches) {
Handle<Code> adaptor = BUILTIN_CODE(isolate(), ArgumentsAdaptorTrampoline);
if (flag == CALL_FUNCTION) {
Call(adaptor, RelocInfo::CODE_TARGET);
if (!*definitely_mismatches) {
jmp(done, near_jump);
}
} else {
Jump(adaptor, RelocInfo::CODE_TARGET);
}
bind(&invoke);
}
}
void MacroAssembler::CheckDebugHook(Register fun, Register new_target,
const ParameterCount& expected,
const ParameterCount& actual) {
Label skip_hook;
ExternalReference debug_hook_active =
ExternalReference::debug_hook_on_function_call_address(isolate());
Operand debug_hook_active_operand = ExternalOperand(debug_hook_active);
cmpb(debug_hook_active_operand, Immediate(0));
j(equal, &skip_hook);
{
FrameScope frame(this,
has_frame() ? StackFrame::NONE : StackFrame::INTERNAL);
if (expected.is_reg()) {
Integer32ToSmi(expected.reg(), expected.reg());
Push(expected.reg());
}
if (actual.is_reg()) {
Integer32ToSmi(actual.reg(), actual.reg());
Push(actual.reg());
}
if (new_target.is_valid()) {
Push(new_target);
}
Push(fun);
Push(fun);
CallRuntime(Runtime::kDebugOnFunctionCall);
Pop(fun);
if (new_target.is_valid()) {
Pop(new_target);
}
if (actual.is_reg()) {
Pop(actual.reg());
SmiToInteger64(actual.reg(), actual.reg());
}
if (expected.is_reg()) {
Pop(expected.reg());
SmiToInteger64(expected.reg(), expected.reg());
}
}
bind(&skip_hook);
}
void TurboAssembler::StubPrologue(StackFrame::Type type) {
pushq(rbp); // Caller's frame pointer.
movp(rbp, rsp);
Push(Immediate(StackFrame::TypeToMarker(type)));
}
void TurboAssembler::Prologue() {
pushq(rbp); // Caller's frame pointer.
movp(rbp, rsp);
Push(rsi); // Callee's context.
Push(rdi); // Callee's JS function.
}
void TurboAssembler::EnterFrame(StackFrame::Type type) {
pushq(rbp);
movp(rbp, rsp);
Push(Immediate(StackFrame::TypeToMarker(type)));
if (type == StackFrame::INTERNAL) {
Move(kScratchRegister, CodeObject(), RelocInfo::EMBEDDED_OBJECT);
Push(kScratchRegister);
}
if (emit_debug_code()) {
Move(kScratchRegister,
isolate()->factory()->undefined_value(),
RelocInfo::EMBEDDED_OBJECT);
cmpp(Operand(rsp, 0), kScratchRegister);
Check(not_equal, kCodeObjectNotProperlyPatched);
}
}
void TurboAssembler::LeaveFrame(StackFrame::Type type) {
if (emit_debug_code()) {
cmpp(Operand(rbp, CommonFrameConstants::kContextOrFrameTypeOffset),
Immediate(StackFrame::TypeToMarker(type)));
Check(equal, kStackFrameTypesMustMatch);
}
movp(rsp, rbp);
popq(rbp);
}
void MacroAssembler::EnterBuiltinFrame(Register context, Register target,
Register argc) {
Push(rbp);
Move(rbp, rsp);
Push(context);
Push(target);
Push(argc);
}
void MacroAssembler::LeaveBuiltinFrame(Register context, Register target,
Register argc) {
Pop(argc);
Pop(target);
Pop(context);
leave();
}
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 * kPointerSize, ExitFrameConstants::kCallerFPOffset);
pushq(rbp);
movp(rbp, rsp);
// Reserve room for entry stack pointer and push the code object.
Push(Immediate(StackFrame::TypeToMarker(frame_type)));
DCHECK_EQ(-2 * kPointerSize, ExitFrameConstants::kSPOffset);
Push(Immediate(0)); // Saved entry sp, patched before call.
Move(kScratchRegister, CodeObject(), RelocInfo::EMBEDDED_OBJECT);
Push(kScratchRegister); // Accessed from ExitFrame::code_slot.
// Save the frame pointer and the context in top.
if (save_rax) {
movp(r14, rax); // Backup rax in callee-save register.
}
Store(ExternalReference(IsolateAddressId::kCEntryFPAddress, isolate()), rbp);
Store(ExternalReference(IsolateAddressId::kContextAddress, isolate()), rsi);
Store(ExternalReference(IsolateAddressId::kCFunctionAddress, isolate()), rbx);
}
void MacroAssembler::EnterExitFrameEpilogue(int arg_stack_space,
bool save_doubles) {
#ifdef _WIN64
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 * kRegisterSize;
subp(rsp, Immediate(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) {
subp(rsp, Immediate(arg_stack_space * kRegisterSize));
}
// 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));
andp(rsp, Immediate(-kFrameAlignment));
}
// Patch the saved entry sp.
movp(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 - kPointerSize;
leap(r15, Operand(rbp, r14, times_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.
movp(rcx, Operand(rbp, kFPOnStackSize));
movp(rbp, Operand(rbp, 0 * kPointerSize));
// Drop everything up to and including the arguments and the receiver
// from the caller stack.
leap(rsp, Operand(r15, 1 * kPointerSize));
PushReturnAddressFrom(rcx);
} else {
// Otherwise just leave the exit frame.
leave();
}
LeaveExitFrameEpilogue(true);
}
void MacroAssembler::LeaveApiExitFrame(bool restore_context) {
movp(rsp, rbp);
popq(rbp);
LeaveExitFrameEpilogue(restore_context);
}
void MacroAssembler::LeaveExitFrameEpilogue(bool restore_context) {
// Restore current context from top and clear it in debug mode.
ExternalReference context_address(IsolateAddressId::kContextAddress,
isolate());
Operand context_operand = ExternalOperand(context_address);
if (restore_context) {
movp(rsi, context_operand);
}
#ifdef DEBUG
movp(context_operand, Immediate(0));
#endif
// Clear the top frame.
ExternalReference c_entry_fp_address(IsolateAddressId::kCEntryFPAddress,
isolate());
Operand c_entry_fp_operand = ExternalOperand(c_entry_fp_address);
movp(c_entry_fp_operand, Immediate(0));
}
void MacroAssembler::LoadAllocationTopHelper(Register result,
Register scratch,
AllocationFlags flags) {
ExternalReference allocation_top =
AllocationUtils::GetAllocationTopReference(isolate(), flags);
// Just return if allocation top is already known.
if ((flags & RESULT_CONTAINS_TOP) != 0) {
// No use of scratch if allocation top is provided.
DCHECK(!scratch.is_valid());
#ifdef DEBUG
// Assert that result actually contains top on entry.
Operand top_operand = ExternalOperand(allocation_top);
cmpp(result, top_operand);
Check(equal, kUnexpectedAllocationTop);
#endif
return;
}
// Move address of new object to result. Use scratch register if available,
// and keep address in scratch until call to UpdateAllocationTopHelper.
if (scratch.is_valid()) {
LoadAddress(scratch, allocation_top);
movp(result, Operand(scratch, 0));
} else {
Load(result, allocation_top);
}
}
void MacroAssembler::MakeSureDoubleAlignedHelper(Register result,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
if (kPointerSize == kDoubleSize) {
if (FLAG_debug_code) {
testl(result, Immediate(kDoubleAlignmentMask));
Check(zero, kAllocationIsNotDoubleAligned);
}
} else {
// Align the next allocation. Storing the filler map without checking top
// is safe in new-space because the limit of the heap is aligned there.
DCHECK(kPointerSize * 2 == kDoubleSize);
DCHECK(kPointerAlignment * 2 == kDoubleAlignment);
// Make sure scratch is not clobbered by this function as it might be
// used in UpdateAllocationTopHelper later.
DCHECK(scratch != kScratchRegister);
Label aligned;
testl(result, Immediate(kDoubleAlignmentMask));
j(zero, &aligned, Label::kNear);
if ((flags & PRETENURE) != 0) {
ExternalReference allocation_limit =
AllocationUtils::GetAllocationLimitReference(isolate(), flags);
cmpp(result, ExternalOperand(allocation_limit));
j(above_equal, gc_required);
}
LoadRoot(kScratchRegister, Heap::kOnePointerFillerMapRootIndex);
movp(Operand(result, 0), kScratchRegister);
addp(result, Immediate(kDoubleSize / 2));
bind(&aligned);
}
}
void MacroAssembler::UpdateAllocationTopHelper(Register result_end,
Register scratch,
AllocationFlags flags) {
if (emit_debug_code()) {
testp(result_end, Immediate(kObjectAlignmentMask));
Check(zero, kUnalignedAllocationInNewSpace);
}
ExternalReference allocation_top =
AllocationUtils::GetAllocationTopReference(isolate(), flags);
// Update new top.
if (scratch.is_valid()) {
// Scratch already contains address of allocation top.
movp(Operand(scratch, 0), result_end);
} else {
Store(allocation_top, result_end);
}
}
void MacroAssembler::Allocate(int object_size,
Register result,
Register result_end,
Register scratch,
Label* gc_required,
AllocationFlags flags) {
DCHECK((flags & (RESULT_CONTAINS_TOP | SIZE_IN_WORDS)) == 0);
DCHECK(object_size <= kMaxRegularHeapObjectSize);
if (!FLAG_inline_new) {
if (emit_debug_code()) {
// Trash the registers to simulate an allocation failure.
movl(result, Immediate(0x7091));
if (result_end.is_valid()) {
movl(result_end, Immediate(0x7191));
}
if (scratch.is_valid()) {
movl(scratch, Immediate(0x7291));
}
}
jmp(gc_required);
return;
}
DCHECK(result != result_end);
// Load address of new object into result.
LoadAllocationTopHelper(result, scratch, flags);
if ((flags & DOUBLE_ALIGNMENT) != 0) {
MakeSureDoubleAlignedHelper(result, scratch, gc_required, flags);
}
// Calculate new top and bail out if new space is exhausted.
ExternalReference allocation_limit =
AllocationUtils::GetAllocationLimitReference(isolate(), flags);
Register top_reg = result_end.is_valid() ? result_end : result;
if (top_reg != result) {
movp(top_reg, result);
}
addp(top_reg, Immediate(object_size));
Operand limit_operand = ExternalOperand(allocation_limit);
cmpp(top_reg, limit_operand);
j(above, gc_required);
UpdateAllocationTopHelper(top_reg, scratch, flags);
if (top_reg == result) {
subp(result, Immediate(object_size - kHeapObjectTag));
} else {
// Tag the result.
DCHECK(kHeapObjectTag == 1);
incp(result);
}
}
void MacroAssembler::AllocateJSValue(Register result, Register constructor,
Register value, Register scratch,
Label* gc_required) {
DCHECK(result != constructor);
DCHECK(result != scratch);
DCHECK(result != value);
// Allocate JSValue in new space.
Allocate(JSValue::kSize, result, scratch, no_reg, gc_required,
NO_ALLOCATION_FLAGS);
// Initialize the JSValue.
LoadGlobalFunctionInitialMap(constructor, scratch);
movp(FieldOperand(result, HeapObject::kMapOffset), scratch);
LoadRoot(scratch, Heap::kEmptyFixedArrayRootIndex);
movp(FieldOperand(result, JSObject::kPropertiesOrHashOffset), scratch);
movp(FieldOperand(result, JSObject::kElementsOffset), scratch);
movp(FieldOperand(result, JSValue::kValueOffset), value);
STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
}
#ifdef _WIN64
static const int kRegisterPassedArguments = 4;
#else
static const int kRegisterPassedArguments = 6;
#endif
void MacroAssembler::LoadNativeContextSlot(int index, Register dst) {
movp(dst, NativeContextOperand());
movp(dst, ContextOperand(dst, index));
}
void MacroAssembler::LoadGlobalFunctionInitialMap(Register function,
Register map) {
// Load the initial map. The global functions all have initial maps.
movp(map, FieldOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
if (emit_debug_code()) {
Label ok, fail;
CheckMap(map, isolate()->factory()->meta_map(), &fail, DO_SMI_CHECK);
jmp(&ok);
bind(&fail);
Abort(kGlobalFunctionsMustHaveInitialMap);
bind(&ok);
}
}
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(num_arguments >= 0);
#ifdef _WIN64
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(frame_alignment != 0);
DCHECK(num_arguments >= 0);
// Make stack end at alignment and allocate space for arguments and old rsp.
movp(kScratchRegister, rsp);
DCHECK(base::bits::IsPowerOfTwo(frame_alignment));
int argument_slots_on_stack =
ArgumentStackSlotsForCFunctionCall(num_arguments);
subp(rsp, Immediate((argument_slots_on_stack + 1) * kRegisterSize));
andp(rsp, Immediate(-frame_alignment));
movp(Operand(rsp, argument_slots_on_stack * kRegisterSize), 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();
}
call(function);
DCHECK(base::OS::ActivationFrameAlignment() != 0);
DCHECK(num_arguments >= 0);
int argument_slots_on_stack =
ArgumentStackSlotsForCFunctionCall(num_arguments);
movp(rsp, Operand(rsp, argument_slots_on_stack * kRegisterSize));
}
#ifdef DEBUG
bool AreAliased(Register reg1,
Register reg2,
Register reg3,
Register reg4,
Register reg5,
Register reg6,
Register reg7,
Register reg8) {
int n_of_valid_regs = reg1.is_valid() + reg2.is_valid() +
reg3.is_valid() + reg4.is_valid() + reg5.is_valid() + reg6.is_valid() +
reg7.is_valid() + reg8.is_valid();
RegList regs = 0;
if (reg1.is_valid()) regs |= reg1.bit();
if (reg2.is_valid()) regs |= reg2.bit();
if (reg3.is_valid()) regs |= reg3.bit();
if (reg4.is_valid()) regs |= reg4.bit();
if (reg5.is_valid()) regs |= reg5.bit();
if (reg6.is_valid()) regs |= reg6.bit();
if (reg7.is_valid()) regs |= reg7.bit();
if (reg8.is_valid()) regs |= reg8.bit();
int n_of_non_aliasing_regs = NumRegs(regs);
return n_of_valid_regs != n_of_non_aliasing_regs;
}
#endif
CodePatcher::CodePatcher(Isolate* isolate, byte* address, int size)
: address_(address),
size_(size),
masm_(isolate, address, size + Assembler::kGap, CodeObjectRequired::kNo) {
// Create a new macro assembler pointing to the address of the code to patch.
// The size is adjusted with kGap on order for the assembler to generate size
// bytes of instructions without failing with buffer size constraints.
DCHECK(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
}
CodePatcher::~CodePatcher() {
// Indicate that code has changed.
Assembler::FlushICache(masm_.isolate(), address_, size_);
// Check that the code was patched as expected.
DCHECK(masm_.pc_ == address_ + size_);
DCHECK(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
}
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) {
andp(scratch, Immediate(~Page::kPageAlignmentMask));
} else {
movp(scratch, Immediate(~Page::kPageAlignmentMask));
andp(scratch, object);
}
if (mask < (1 << kBitsPerByte)) {
testb(Operand(scratch, MemoryChunk::kFlagsOffset),
Immediate(static_cast<uint8_t>(mask)));
} else {
testl(Operand(scratch, MemoryChunk::kFlagsOffset), Immediate(mask));
}
j(cc, condition_met, condition_met_distance);
}
void MacroAssembler::JumpIfBlack(Register object,
Register bitmap_scratch,
Register mask_scratch,
Label* on_black,
Label::Distance on_black_distance) {
DCHECK(!AreAliased(object, bitmap_scratch, mask_scratch, rcx));
GetMarkBits(object, bitmap_scratch, mask_scratch);
DCHECK(strcmp(Marking::kBlackBitPattern, "11") == 0);
// The mask_scratch register contains a 1 at the position of the first bit
// and a 1 at a position of the second bit. All other positions are zero.
movp(rcx, mask_scratch);
andp(rcx, Operand(bitmap_scratch, MemoryChunk::kHeaderSize));
cmpp(mask_scratch, rcx);
j(equal, on_black, on_black_distance);
}
void MacroAssembler::GetMarkBits(Register addr_reg,
Register bitmap_reg,
Register mask_reg) {
DCHECK(!AreAliased(addr_reg, bitmap_reg, mask_reg, rcx));
movp(bitmap_reg, addr_reg);
// Sign extended 32 bit immediate.
andp(bitmap_reg, Immediate(~Page::kPageAlignmentMask));
movp(rcx, addr_reg);
int shift =
Bitmap::kBitsPerCellLog2 + kPointerSizeLog2 - Bitmap::kBytesPerCellLog2;
shrl(rcx, Immediate(shift));
andp(rcx,
Immediate((Page::kPageAlignmentMask >> shift) &
~(Bitmap::kBytesPerCell - 1)));
addp(bitmap_reg, rcx);
movp(rcx, addr_reg);
shrl(rcx, Immediate(kPointerSizeLog2));
andp(rcx, Immediate((1 << Bitmap::kBitsPerCellLog2) - 1));
movl(mask_reg, Immediate(3));
shlp_cl(mask_reg);
}
void MacroAssembler::JumpIfWhite(Register value, Register bitmap_scratch,
Register mask_scratch, Label* value_is_white,
Label::Distance distance) {
DCHECK(!AreAliased(value, bitmap_scratch, mask_scratch, rcx));
GetMarkBits(value, bitmap_scratch, mask_scratch);
// If the value is black or grey we don't need to do anything.
DCHECK(strcmp(Marking::kWhiteBitPattern, "00") == 0);
DCHECK(strcmp(Marking::kBlackBitPattern, "11") == 0);
DCHECK(strcmp(Marking::kGreyBitPattern, "10") == 0);
DCHECK(strcmp(Marking::kImpossibleBitPattern, "01") == 0);
// Since both black and grey have a 1 in the first position and white does
// not have a 1 there we only need to check one bit.
testp(Operand(bitmap_scratch, MemoryChunk::kHeaderSize), mask_scratch);
j(zero, value_is_white, distance);
}
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_X64