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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#if V8_TARGET_ARCH_IA32
#include "src/base/bits.h"
#include "src/base/division-by-constant.h"
#include "src/base/utils/random-number-generator.h"
#include "src/codegen/callable.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/external-reference-table.h"
#include "src/codegen/ia32/assembler-ia32-inl.h"
#include "src/codegen/macro-assembler.h"
#include "src/debug/debug.h"
#include "src/execution/frame-constants.h"
#include "src/execution/frames-inl.h"
#include "src/heap/heap-inl.h" // For MemoryChunk.
#include "src/init/bootstrapper.h"
#include "src/logging/counters.h"
#include "src/runtime/runtime.h"
#include "src/snapshot/embedded/embedded-data.h"
#include "src/snapshot/snapshot.h"
// Satisfy cpplint check, but don't include platform-specific header. It is
// included recursively via macro-assembler.h.
#if 0
#include "src/codegen/ia32/macro-assembler-ia32.h"
#endif
namespace v8 {
namespace internal {
// -------------------------------------------------------------------------
// MacroAssembler implementation.
void TurboAssembler::InitializeRootRegister() {
ExternalReference isolate_root = ExternalReference::isolate_root(isolate());
Move(kRootRegister, Immediate(isolate_root));
}
void TurboAssembler::LoadRoot(Register destination, RootIndex index) {
if (root_array_available()) {
mov(destination,
Operand(kRootRegister, RootRegisterOffsetForRootIndex(index)));
return;
}
if (RootsTable::IsImmortalImmovable(index)) {
Handle<Object> object = isolate()->root_handle(index);
if (object->IsSmi()) {
mov(destination, Immediate(Smi::cast(*object)));
return;
} else {
DCHECK(object->IsHeapObject());
mov(destination, Handle<HeapObject>::cast(object));
return;
}
}
ExternalReference isolate_root = ExternalReference::isolate_root(isolate());
lea(destination,
Operand(isolate_root.address(), RelocInfo::EXTERNAL_REFERENCE));
mov(destination, Operand(destination, RootRegisterOffsetForRootIndex(index)));
}
void TurboAssembler::CompareRoot(Register with, Register scratch,
RootIndex index) {
if (root_array_available()) {
CompareRoot(with, index);
} else {
ExternalReference isolate_root = ExternalReference::isolate_root(isolate());
lea(scratch,
Operand(isolate_root.address(), RelocInfo::EXTERNAL_REFERENCE));
cmp(with, Operand(scratch, RootRegisterOffsetForRootIndex(index)));
}
}
void TurboAssembler::CompareRoot(Register with, RootIndex index) {
if (root_array_available()) {
cmp(with, Operand(kRootRegister, RootRegisterOffsetForRootIndex(index)));
return;
}
DCHECK(RootsTable::IsImmortalImmovable(index));
Handle<Object> object = isolate()->root_handle(index);
if (object->IsHeapObject()) {
cmp(with, Handle<HeapObject>::cast(object));
} else {
cmp(with, Immediate(Smi::cast(*object)));
}
}
void TurboAssembler::CompareRealStackLimit(Register with) {
CHECK(root_array_available()); // Only used by builtins.
// Address through the root register. No load is needed.
ExternalReference limit =
ExternalReference::address_of_real_jslimit(isolate());
DCHECK(IsAddressableThroughRootRegister(isolate(), limit));
intptr_t offset = RootRegisterOffsetForExternalReference(isolate(), limit);
cmp(with, Operand(kRootRegister, offset));
}
void MacroAssembler::PushRoot(RootIndex index) {
if (root_array_available()) {
DCHECK(RootsTable::IsImmortalImmovable(index));
push(Operand(kRootRegister, RootRegisterOffsetForRootIndex(index)));
return;
}
// TODO(v8:6666): Add a scratch register or remove all uses.
DCHECK(RootsTable::IsImmortalImmovable(index));
Handle<Object> object = isolate()->root_handle(index);
if (object->IsHeapObject()) {
Push(Handle<HeapObject>::cast(object));
} else {
Push(Smi::cast(*object));
}
}
void MacroAssembler::JumpIfIsInRange(Register value, unsigned lower_limit,
unsigned higher_limit, Register scratch,
Label* on_in_range,
Label::Distance near_jump) {
if (lower_limit != 0) {
lea(scratch, Operand(value, 0u - lower_limit));
cmp(scratch, Immediate(higher_limit - lower_limit));
} else {
cmp(value, Immediate(higher_limit));
}
j(below_equal, on_in_range, near_jump);
}
Operand TurboAssembler::ExternalReferenceAsOperand(ExternalReference reference,
Register scratch) {
// TODO(jgruber): Add support for enable_root_array_delta_access.
if (root_array_available() && options().isolate_independent_code) {
if (IsAddressableThroughRootRegister(isolate(), reference)) {
// Some external references can be efficiently loaded as an offset from
// kRootRegister.
intptr_t offset =
RootRegisterOffsetForExternalReference(isolate(), reference);
return Operand(kRootRegister, offset);
} else {
// Otherwise, do a memory load from the external reference table.
mov(scratch, Operand(kRootRegister,
RootRegisterOffsetForExternalReferenceTableEntry(
isolate(), reference)));
return Operand(scratch, 0);
}
}
Move(scratch, Immediate(reference));
return Operand(scratch, 0);
}
// TODO(v8:6666): If possible, refactor into a platform-independent function in
// TurboAssembler.
Operand TurboAssembler::ExternalReferenceAddressAsOperand(
ExternalReference reference) {
DCHECK(FLAG_embedded_builtins);
DCHECK(root_array_available());
DCHECK(options().isolate_independent_code);
return Operand(
kRootRegister,
RootRegisterOffsetForExternalReferenceTableEntry(isolate(), reference));
}
// TODO(v8:6666): If possible, refactor into a platform-independent function in
// TurboAssembler.
Operand TurboAssembler::HeapObjectAsOperand(Handle<HeapObject> object) {
DCHECK(FLAG_embedded_builtins);
DCHECK(root_array_available());
int builtin_index;
RootIndex root_index;
if (isolate()->roots_table().IsRootHandle(object, &root_index)) {
return Operand(kRootRegister, RootRegisterOffsetForRootIndex(root_index));
} else if (isolate()->builtins()->IsBuiltinHandle(object, &builtin_index)) {
return Operand(kRootRegister,
RootRegisterOffsetForBuiltinIndex(builtin_index));
} else if (object.is_identical_to(code_object_) &&
Builtins::IsBuiltinId(maybe_builtin_index_)) {
return Operand(kRootRegister,
RootRegisterOffsetForBuiltinIndex(maybe_builtin_index_));
} else {
// Objects in the constants table need an additional indirection, which
// cannot be represented as a single Operand.
UNREACHABLE();
}
}
void TurboAssembler::LoadFromConstantsTable(Register destination,
int constant_index) {
DCHECK(RootsTable::IsImmortalImmovable(RootIndex::kBuiltinsConstantsTable));
LoadRoot(destination, RootIndex::kBuiltinsConstantsTable);
mov(destination,
FieldOperand(destination, FixedArray::OffsetOfElementAt(constant_index)));
}
void TurboAssembler::LoadRootRegisterOffset(Register destination,
intptr_t offset) {
DCHECK(is_int32(offset));
DCHECK(root_array_available());
if (offset == 0) {
mov(destination, kRootRegister);
} else {
lea(destination, Operand(kRootRegister, static_cast<int32_t>(offset)));
}
}
void TurboAssembler::LoadRootRelative(Register destination, int32_t offset) {
DCHECK(root_array_available());
mov(destination, Operand(kRootRegister, offset));
}
void TurboAssembler::LoadAddress(Register destination,
ExternalReference source) {
// TODO(jgruber): Add support for enable_root_array_delta_access.
if (root_array_available() && options().isolate_independent_code) {
IndirectLoadExternalReference(destination, source);
return;
}
mov(destination, Immediate(source));
}
static constexpr Register saved_regs[] = {eax, ecx, edx};
static constexpr int kNumberOfSavedRegs = sizeof(saved_regs) / sizeof(Register);
int TurboAssembler::RequiredStackSizeForCallerSaved(SaveFPRegsMode fp_mode,
Register exclusion1,
Register exclusion2,
Register exclusion3) const {
int bytes = 0;
for (int i = 0; i < kNumberOfSavedRegs; i++) {
Register reg = saved_regs[i];
if (reg != exclusion1 && reg != exclusion2 && reg != exclusion3) {
bytes += kSystemPointerSize;
}
}
if (fp_mode == kSaveFPRegs) {
// Count all XMM registers except XMM0.
bytes += kDoubleSize * (XMMRegister::kNumRegisters - 1);
}
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) {
push(reg);
bytes += kSystemPointerSize;
}
}
if (fp_mode == kSaveFPRegs) {
// Save all XMM registers except XMM0.
int delta = kDoubleSize * (XMMRegister::kNumRegisters - 1);
AllocateStackSpace(delta);
for (int i = XMMRegister::kNumRegisters - 1; i > 0; i--) {
XMMRegister reg = XMMRegister::from_code(i);
movsd(Operand(esp, (i - 1) * 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) {
// Restore all XMM registers except XMM0.
int delta = kDoubleSize * (XMMRegister::kNumRegisters - 1);
for (int i = XMMRegister::kNumRegisters - 1; i > 0; i--) {
XMMRegister reg = XMMRegister::from_code(i);
movsd(reg, Operand(esp, (i - 1) * kDoubleSize));
}
add(esp, Immediate(delta));
bytes += delta;
}
for (int i = kNumberOfSavedRegs - 1; i >= 0; i--) {
Register reg = saved_regs[i];
if (reg != exclusion1 && reg != exclusion2 && reg != exclusion3) {
pop(reg);
bytes += kSystemPointerSize;
}
}
return bytes;
}
void MacroAssembler::RecordWriteField(Register object, int offset,
Register value, Register dst,
SaveFPRegsMode save_fp,
RememberedSetAction remembered_set_action,
SmiCheck smi_check) {
// First, check if a write barrier is even needed. The tests below
// catch stores of Smis.
Label done;
// Skip barrier if writing a smi.
if (smi_check == INLINE_SMI_CHECK) {
JumpIfSmi(value, &done);
}
// Although the object register is tagged, the offset is relative to the start
// of the object, so so offset must be a multiple of kTaggedSize.
DCHECK(IsAligned(offset, kTaggedSize));
lea(dst, FieldOperand(object, offset));
if (emit_debug_code()) {
Label ok;
test_b(dst, Immediate(kTaggedSize - 1));
j(zero, &ok, Label::kNear);
int3();
bind(&ok);
}
RecordWrite(object, dst, value, save_fp, remembered_set_action,
OMIT_SMI_CHECK);
bind(&done);
// Clobber clobbered input registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
mov(value, Immediate(bit_cast<int32_t>(kZapValue)));
mov(dst, Immediate(bit_cast<int32_t>(kZapValue)));
}
}
void TurboAssembler::SaveRegisters(RegList registers) {
DCHECK_GT(NumRegs(registers), 0);
for (int i = 0; i < Register::kNumRegisters; ++i) {
if ((registers >> i) & 1u) {
push(Register::from_code(i));
}
}
}
void TurboAssembler::RestoreRegisters(RegList registers) {
DCHECK_GT(NumRegs(registers), 0);
for (int i = Register::kNumRegisters - 1; i >= 0; --i) {
if ((registers >> i) & 1u) {
pop(Register::from_code(i));
}
}
}
void TurboAssembler::CallEphemeronKeyBarrier(Register object, Register address,
SaveFPRegsMode fp_mode) {
EphemeronKeyBarrierDescriptor descriptor;
RegList registers = descriptor.allocatable_registers();
SaveRegisters(registers);
Register object_parameter(
descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kObject));
Register slot_parameter(descriptor.GetRegisterParameter(
EphemeronKeyBarrierDescriptor::kSlotAddress));
Register fp_mode_parameter(
descriptor.GetRegisterParameter(EphemeronKeyBarrierDescriptor::kFPMode));
push(object);
push(address);
pop(slot_parameter);
pop(object_parameter);
Move(fp_mode_parameter, Smi::FromEnum(fp_mode));
Call(isolate()->builtins()->builtin_handle(Builtins::kEphemeronKeyBarrier),
RelocInfo::CODE_TARGET);
RestoreRegisters(registers);
}
void TurboAssembler::CallRecordWriteStub(
Register object, Register address,
RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode) {
CallRecordWriteStub(
object, address, remembered_set_action, fp_mode,
isolate()->builtins()->builtin_handle(Builtins::kRecordWrite),
kNullAddress);
}
void TurboAssembler::CallRecordWriteStub(
Register object, Register address,
RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode,
Address wasm_target) {
CallRecordWriteStub(object, address, remembered_set_action, fp_mode,
Handle<Code>::null(), wasm_target);
}
void TurboAssembler::CallRecordWriteStub(
Register object, Register address,
RememberedSetAction remembered_set_action, SaveFPRegsMode fp_mode,
Handle<Code> code_target, Address wasm_target) {
DCHECK_NE(code_target.is_null(), wasm_target == kNullAddress);
// TODO(albertnetymk): For now we ignore remembered_set_action and fp_mode,
// i.e. always emit remember set and save FP registers in RecordWriteStub. If
// large performance regression is observed, we should use these values to
// avoid unnecessary work.
RecordWriteDescriptor descriptor;
RegList registers = descriptor.allocatable_registers();
SaveRegisters(registers);
Register object_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kObject));
Register slot_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kSlot));
Register remembered_set_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kRememberedSet));
Register fp_mode_parameter(
descriptor.GetRegisterParameter(RecordWriteDescriptor::kFPMode));
push(object);
push(address);
pop(slot_parameter);
pop(object_parameter);
Move(remembered_set_parameter, Smi::FromEnum(remembered_set_action));
Move(fp_mode_parameter, Smi::FromEnum(fp_mode));
if (code_target.is_null()) {
// Use {wasm_call} for direct Wasm call within a module.
wasm_call(wasm_target, RelocInfo::WASM_STUB_CALL);
} else {
Call(code_target, RelocInfo::CODE_TARGET);
}
RestoreRegisters(registers);
}
void MacroAssembler::RecordWrite(Register object, Register address,
Register value, SaveFPRegsMode fp_mode,
RememberedSetAction remembered_set_action,
SmiCheck smi_check) {
DCHECK(object != value);
DCHECK(object != address);
DCHECK(value != address);
AssertNotSmi(object);
if ((remembered_set_action == OMIT_REMEMBERED_SET &&
!FLAG_incremental_marking) ||
FLAG_disable_write_barriers) {
return;
}
if (emit_debug_code()) {
Label ok;
cmp(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 young gen.
Label done;
if (smi_check == INLINE_SMI_CHECK) {
// Skip barrier if writing a smi.
JumpIfSmi(value, &done, Label::kNear);
}
CheckPageFlag(value,
value, // Used as scratch.
MemoryChunk::kPointersToHereAreInterestingMask, zero, &done,
Label::kNear);
CheckPageFlag(object,
value, // Used as scratch.
MemoryChunk::kPointersFromHereAreInterestingMask, zero, &done,
Label::kNear);
CallRecordWriteStub(object, address, remembered_set_action, fp_mode);
bind(&done);
// Clobber clobbered registers when running with the debug-code flag
// turned on to provoke errors.
if (emit_debug_code()) {
mov(address, Immediate(bit_cast<int32_t>(kZapValue)));
mov(value, Immediate(bit_cast<int32_t>(kZapValue)));
}
}
void MacroAssembler::MaybeDropFrames() {
// Check whether we need to drop frames to restart a function on the stack.
Label dont_drop;
ExternalReference restart_fp =
ExternalReference::debug_restart_fp_address(isolate());
mov(eax, ExternalReferenceAsOperand(restart_fp, eax));
test(eax, eax);
j(zero, &dont_drop, Label::kNear);
Jump(BUILTIN_CODE(isolate(), FrameDropperTrampoline), RelocInfo::CODE_TARGET);
bind(&dont_drop);
}
void TurboAssembler::Cvtsi2ss(XMMRegister dst, Operand src) {
xorps(dst, dst);
cvtsi2ss(dst, src);
}
void TurboAssembler::Cvtsi2sd(XMMRegister dst, Operand src) {
xorpd(dst, dst);
cvtsi2sd(dst, src);
}
void TurboAssembler::Cvtui2ss(XMMRegister dst, Operand src, Register tmp) {
Label done;
Register src_reg = src.is_reg_only() ? src.reg() : tmp;
if (src_reg == tmp) mov(tmp, src);
cvtsi2ss(dst, src_reg);
test(src_reg, src_reg);
j(positive, &done, Label::kNear);
// Compute {src/2 | (src&1)} (retain the LSB to avoid rounding errors).
if (src_reg != tmp) mov(tmp, src_reg);
shr(tmp, 1);
// The LSB is shifted into CF. If it is set, set the LSB in {tmp}.
Label msb_not_set;
j(not_carry, &msb_not_set, Label::kNear);
or_(tmp, Immediate(1));
bind(&msb_not_set);
cvtsi2ss(dst, tmp);
addss(dst, dst);
bind(&done);
}
void TurboAssembler::Cvttss2ui(Register dst, Operand src, XMMRegister tmp) {
Label done;
cvttss2si(dst, src);
test(dst, dst);
j(positive, &done);
Move(tmp, static_cast<float>(INT32_MIN));
addss(tmp, src);
cvttss2si(dst, tmp);
or_(dst, Immediate(0x80000000));
bind(&done);
}
void TurboAssembler::Cvtui2sd(XMMRegister dst, Operand src, Register scratch) {
Label done;
cmp(src, Immediate(0));
ExternalReference uint32_bias = ExternalReference::address_of_uint32_bias();
Cvtsi2sd(dst, src);
j(not_sign, &done, Label::kNear);
addsd(dst, ExternalReferenceAsOperand(uint32_bias, scratch));
bind(&done);
}
void TurboAssembler::Cvttsd2ui(Register dst, Operand src, XMMRegister tmp) {
Move(tmp, -2147483648.0);
addsd(tmp, src);
cvttsd2si(dst, tmp);
add(dst, Immediate(0x80000000));
}
void TurboAssembler::ShlPair(Register high, Register low, uint8_t shift) {
if (shift >= 32) {
mov(high, low);
shl(high, shift - 32);
xor_(low, low);
} else {
shld(high, low, shift);
shl(low, shift);
}
}
void TurboAssembler::ShlPair_cl(Register high, Register low) {
shld_cl(high, low);
shl_cl(low);
Label done;
test(ecx, Immediate(0x20));
j(equal, &done, Label::kNear);
mov(high, low);
xor_(low, low);
bind(&done);
}
void TurboAssembler::ShrPair(Register high, Register low, uint8_t shift) {
if (shift >= 32) {
mov(low, high);
shr(low, shift - 32);
xor_(high, high);
} else {
shrd(high, low, shift);
shr(high, shift);
}
}
void TurboAssembler::ShrPair_cl(Register high, Register low) {
shrd_cl(low, high);
shr_cl(high);
Label done;
test(ecx, Immediate(0x20));
j(equal, &done, Label::kNear);
mov(low, high);
xor_(high, high);
bind(&done);
}
void TurboAssembler::SarPair(Register high, Register low, uint8_t shift) {
if (shift >= 32) {
mov(low, high);
sar(low, shift - 32);
sar(high, 31);
} else {
shrd(high, low, shift);
sar(high, shift);
}
}
void TurboAssembler::SarPair_cl(Register high, Register low) {
shrd_cl(low, high);
sar_cl(high);
Label done;
test(ecx, Immediate(0x20));
j(equal, &done, Label::kNear);
mov(low, high);
sar(high, 31);
bind(&done);
}
void MacroAssembler::CmpObjectType(Register heap_object, InstanceType type,
Register map) {
mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
CmpInstanceType(map, type);
}
void MacroAssembler::CmpInstanceType(Register map, InstanceType type) {
cmpw(FieldOperand(map, Map::kInstanceTypeOffset), Immediate(type));
}
void MacroAssembler::AssertSmi(Register object) {
if (emit_debug_code()) {
test(object, Immediate(kSmiTagMask));
Check(equal, AbortReason::kOperandIsNotASmi);
}
}
void MacroAssembler::AssertConstructor(Register object) {
if (emit_debug_code()) {
test(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotAConstructor);
Push(object);
mov(object, FieldOperand(object, HeapObject::kMapOffset));
test_b(FieldOperand(object, Map::kBitFieldOffset),
Immediate(Map::IsConstructorBit::kMask));
Pop(object);
Check(not_zero, AbortReason::kOperandIsNotAConstructor);
}
}
void MacroAssembler::AssertFunction(Register object) {
if (emit_debug_code()) {
test(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotAFunction);
Push(object);
CmpObjectType(object, JS_FUNCTION_TYPE, object);
Pop(object);
Check(equal, AbortReason::kOperandIsNotAFunction);
}
}
void MacroAssembler::AssertBoundFunction(Register object) {
if (emit_debug_code()) {
test(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotABoundFunction);
Push(object);
CmpObjectType(object, JS_BOUND_FUNCTION_TYPE, object);
Pop(object);
Check(equal, AbortReason::kOperandIsNotABoundFunction);
}
}
void MacroAssembler::AssertGeneratorObject(Register object) {
if (!emit_debug_code()) return;
test(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmiAndNotAGeneratorObject);
{
Push(object);
Register map = object;
// Load map
mov(map, FieldOperand(object, HeapObject::kMapOffset));
Label do_check;
// Check if JSGeneratorObject
CmpInstanceType(map, JS_GENERATOR_OBJECT_TYPE);
j(equal, &do_check, Label::kNear);
// Check if JSAsyncFunctionObject.
CmpInstanceType(map, JS_ASYNC_FUNCTION_OBJECT_TYPE);
j(equal, &do_check, Label::kNear);
// Check if JSAsyncGeneratorObject
CmpInstanceType(map, JS_ASYNC_GENERATOR_OBJECT_TYPE);
bind(&do_check);
Pop(object);
}
Check(equal, AbortReason::kOperandIsNotAGeneratorObject);
}
void MacroAssembler::AssertUndefinedOrAllocationSite(Register object,
Register scratch) {
if (emit_debug_code()) {
Label done_checking;
AssertNotSmi(object);
CompareRoot(object, scratch, RootIndex::kUndefinedValue);
j(equal, &done_checking);
LoadRoot(scratch, RootIndex::kAllocationSiteWithWeakNextMap);
cmp(FieldOperand(object, 0), scratch);
Assert(equal, AbortReason::kExpectedUndefinedOrCell);
bind(&done_checking);
}
}
void MacroAssembler::AssertNotSmi(Register object) {
if (emit_debug_code()) {
test(object, Immediate(kSmiTagMask));
Check(not_equal, AbortReason::kOperandIsASmi);
}
}
void TurboAssembler::StubPrologue(StackFrame::Type type) {
push(ebp); // Caller's frame pointer.
mov(ebp, esp);
push(Immediate(StackFrame::TypeToMarker(type)));
}
void TurboAssembler::Prologue() {
push(ebp); // Caller's frame pointer.
mov(ebp, esp);
push(esi); // Callee's context.
push(edi); // Callee's JS function.
}
void TurboAssembler::EnterFrame(StackFrame::Type type) {
push(ebp);
mov(ebp, esp);
push(Immediate(StackFrame::TypeToMarker(type)));
}
void TurboAssembler::LeaveFrame(StackFrame::Type type) {
if (emit_debug_code()) {
cmp(Operand(ebp, CommonFrameConstants::kContextOrFrameTypeOffset),
Immediate(StackFrame::TypeToMarker(type)));
Check(equal, AbortReason::kStackFrameTypesMustMatch);
}
leave();
}
#ifdef V8_OS_WIN
void TurboAssembler::AllocateStackSpace(Register bytes_scratch) {
// In windows, we cannot increment the stack size by more than one page
// (minimum page size is 4KB) without accessing at least one byte on the
// page. Check this:
// https://msdn.microsoft.com/en-us/library/aa227153(v=vs.60).aspx.
Label check_offset;
Label touch_next_page;
jmp(&check_offset);
bind(&touch_next_page);
sub(esp, Immediate(kStackPageSize));
// Just to touch the page, before we increment further.
mov(Operand(esp, 0), Immediate(0));
sub(bytes_scratch, Immediate(kStackPageSize));
bind(&check_offset);
cmp(bytes_scratch, kStackPageSize);
j(greater, &touch_next_page);
sub(esp, bytes_scratch);
}
void TurboAssembler::AllocateStackSpace(int bytes) {
while (bytes > kStackPageSize) {
sub(esp, Immediate(kStackPageSize));
mov(Operand(esp, 0), Immediate(0));
bytes -= kStackPageSize;
}
sub(esp, Immediate(bytes));
}
#endif
void MacroAssembler::EnterExitFramePrologue(StackFrame::Type frame_type,
Register scratch) {
DCHECK(frame_type == StackFrame::EXIT ||
frame_type == StackFrame::BUILTIN_EXIT);
// Set up the frame structure on the stack.
DCHECK_EQ(+2 * kSystemPointerSize, ExitFrameConstants::kCallerSPDisplacement);
DCHECK_EQ(+1 * kSystemPointerSize, ExitFrameConstants::kCallerPCOffset);
DCHECK_EQ(0 * kSystemPointerSize, ExitFrameConstants::kCallerFPOffset);
push(ebp);
mov(ebp, esp);
// Reserve room for entry stack pointer.
push(Immediate(StackFrame::TypeToMarker(frame_type)));
DCHECK_EQ(-2 * kSystemPointerSize, ExitFrameConstants::kSPOffset);
push(Immediate(0)); // Saved entry sp, patched before call.
STATIC_ASSERT(edx == kRuntimeCallFunctionRegister);
STATIC_ASSERT(esi == kContextRegister);
// Save the frame pointer and the context in top.
ExternalReference c_entry_fp_address =
ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate());
ExternalReference context_address =
ExternalReference::Create(IsolateAddressId::kContextAddress, isolate());
ExternalReference c_function_address =
ExternalReference::Create(IsolateAddressId::kCFunctionAddress, isolate());
DCHECK(!AreAliased(scratch, ebp, esi, edx));
mov(ExternalReferenceAsOperand(c_entry_fp_address, scratch), ebp);
mov(ExternalReferenceAsOperand(context_address, scratch), esi);
mov(ExternalReferenceAsOperand(c_function_address, scratch), edx);
}
void MacroAssembler::EnterExitFrameEpilogue(int argc, bool save_doubles) {
// Optionally save all XMM registers.
if (save_doubles) {
int space =
XMMRegister::kNumRegisters * kDoubleSize + argc * kSystemPointerSize;
AllocateStackSpace(space);
const int offset = -ExitFrameConstants::kFixedFrameSizeFromFp;
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
movsd(Operand(ebp, offset - ((i + 1) * kDoubleSize)), reg);
}
} else {
AllocateStackSpace(argc * kSystemPointerSize);
}
// Get the required frame alignment for the OS.
const int kFrameAlignment = base::OS::ActivationFrameAlignment();
if (kFrameAlignment > 0) {
DCHECK(base::bits::IsPowerOfTwo(kFrameAlignment));
and_(esp, -kFrameAlignment);
}
// Patch the saved entry sp.
mov(Operand(ebp, ExitFrameConstants::kSPOffset), esp);
}
void MacroAssembler::EnterExitFrame(int argc, bool save_doubles,
StackFrame::Type frame_type) {
EnterExitFramePrologue(frame_type, edi);
// Set up argc and argv in callee-saved registers.
int offset = StandardFrameConstants::kCallerSPOffset - kSystemPointerSize;
mov(edi, eax);
lea(esi, Operand(ebp, eax, times_system_pointer_size, offset));
// Reserve space for argc, argv and isolate.
EnterExitFrameEpilogue(argc, save_doubles);
}
void MacroAssembler::EnterApiExitFrame(int argc, Register scratch) {
EnterExitFramePrologue(StackFrame::EXIT, scratch);
EnterExitFrameEpilogue(argc, false);
}
void MacroAssembler::LeaveExitFrame(bool save_doubles, bool pop_arguments) {
// Optionally restore all XMM registers.
if (save_doubles) {
const int offset = -ExitFrameConstants::kFixedFrameSizeFromFp;
for (int i = 0; i < XMMRegister::kNumRegisters; i++) {
XMMRegister reg = XMMRegister::from_code(i);
movsd(reg, Operand(ebp, offset - ((i + 1) * kDoubleSize)));
}
}
if (pop_arguments) {
// Get the return address from the stack and restore the frame pointer.
mov(ecx, Operand(ebp, 1 * kSystemPointerSize));
mov(ebp, Operand(ebp, 0 * kSystemPointerSize));
// Pop the arguments and the receiver from the caller stack.
lea(esp, Operand(esi, 1 * kSystemPointerSize));
// Push the return address to get ready to return.
push(ecx);
} else {
// Otherwise just leave the exit frame.
leave();
}
LeaveExitFrameEpilogue();
}
void MacroAssembler::LeaveExitFrameEpilogue() {
// Clear the top frame.
ExternalReference c_entry_fp_address =
ExternalReference::Create(IsolateAddressId::kCEntryFPAddress, isolate());
mov(ExternalReferenceAsOperand(c_entry_fp_address, esi), Immediate(0));
// Restore current context from top and clear it in debug mode.
ExternalReference context_address =
ExternalReference::Create(IsolateAddressId::kContextAddress, isolate());
mov(esi, ExternalReferenceAsOperand(context_address, esi));
#ifdef DEBUG
push(eax);
mov(ExternalReferenceAsOperand(context_address, eax),
Immediate(Context::kInvalidContext));
pop(eax);
#endif
}
void MacroAssembler::LeaveApiExitFrame() {
mov(esp, ebp);
pop(ebp);
LeaveExitFrameEpilogue();
}
void MacroAssembler::PushStackHandler(Register scratch) {
// Adjust this code if not the case.
STATIC_ASSERT(StackHandlerConstants::kSize == 2 * kSystemPointerSize);
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
push(Immediate(0)); // Padding.
// Link the current handler as the next handler.
ExternalReference handler_address =
ExternalReference::Create(IsolateAddressId::kHandlerAddress, isolate());
push(ExternalReferenceAsOperand(handler_address, scratch));
// Set this new handler as the current one.
mov(ExternalReferenceAsOperand(handler_address, scratch), esp);
}
void MacroAssembler::PopStackHandler(Register scratch) {
STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0);
ExternalReference handler_address =
ExternalReference::Create(IsolateAddressId::kHandlerAddress, isolate());
pop(ExternalReferenceAsOperand(handler_address, scratch));
add(esp, Immediate(StackHandlerConstants::kSize - kSystemPointerSize));
}
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.
Move(kRuntimeCallArgCountRegister, Immediate(num_arguments));
Move(kRuntimeCallFunctionRegister, Immediate(ExternalReference::Create(f)));
Handle<Code> code =
CodeFactory::CEntry(isolate(), f->result_size, save_doubles);
Call(code, RelocInfo::CODE_TARGET);
}
void TurboAssembler::CallRuntimeWithCEntry(Runtime::FunctionId fid,
Register centry) {
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.
Move(kRuntimeCallArgCountRegister, Immediate(f->nargs));
Move(kRuntimeCallFunctionRegister, Immediate(ExternalReference::Create(f)));
DCHECK(!AreAliased(centry, kRuntimeCallArgCountRegister,
kRuntimeCallFunctionRegister));
CallCodeObject(centry);
}
void MacroAssembler::TailCallRuntime(Runtime::FunctionId fid) {
// ----------- S t a t e -------------
// -- esp[0] : return address
// -- esp[8] : argument num_arguments - 1
// ...
// -- esp[8 * num_arguments] : argument 0 (receiver)
//
// For runtime functions with variable arguments:
// -- eax : number of arguments
// -----------------------------------
const Runtime::Function* function = Runtime::FunctionForId(fid);
DCHECK_EQ(1, function->result_size);
if (function->nargs >= 0) {
// 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.
Move(kRuntimeCallArgCountRegister, Immediate(function->nargs));
}
JumpToExternalReference(ExternalReference::Create(fid));
}
void MacroAssembler::JumpToExternalReference(const ExternalReference& ext,
bool builtin_exit_frame) {
// Set the entry point and jump to the C entry runtime stub.
Move(kRuntimeCallFunctionRegister, Immediate(ext));
Handle<Code> code = CodeFactory::CEntry(isolate(), 1, kDontSaveFPRegs,
kArgvOnStack, builtin_exit_frame);
Jump(code, RelocInfo::CODE_TARGET);
}
void MacroAssembler::JumpToInstructionStream(Address entry) {
jmp(entry, RelocInfo::OFF_HEAP_TARGET);
}
void TurboAssembler::PrepareForTailCall(
const ParameterCount& callee_args_count, Register caller_args_count_reg,
Register scratch0, Register scratch1,
int number_of_temp_values_after_return_address) {
#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()) {
sub(caller_args_count_reg, callee_args_count.reg());
lea(new_sp_reg,
Operand(ebp, caller_args_count_reg, times_system_pointer_size,
StandardFrameConstants::kCallerPCOffset -
number_of_temp_values_after_return_address *
kSystemPointerSize));
} else {
lea(new_sp_reg,
Operand(ebp, caller_args_count_reg, times_system_pointer_size,
StandardFrameConstants::kCallerPCOffset -
(callee_args_count.immediate() +
number_of_temp_values_after_return_address) *
kSystemPointerSize));
}
if (FLAG_debug_code) {
cmp(esp, new_sp_reg);
Check(below, AbortReason::kStackAccessBelowStackPointer);
}
// Copy return address from caller's frame to current frame's return address
// to avoid its trashing and let the following loop copy it to the right
// place.
Register tmp_reg = scratch1;
mov(tmp_reg, Operand(ebp, StandardFrameConstants::kCallerPCOffset));
mov(Operand(esp,
number_of_temp_values_after_return_address * kSystemPointerSize),
tmp_reg);
// Restore caller's frame pointer now as it could be overwritten by
// the copying loop.
mov(ebp, Operand(ebp, 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()) {
lea(count_reg, Operand(callee_args_count.reg(),
2 + number_of_temp_values_after_return_address));
} else {
mov(count_reg, Immediate(callee_args_count.immediate() + 2 +
number_of_temp_values_after_return_address));
// 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);
dec(count_reg);
mov(tmp_reg, Operand(esp, count_reg, times_system_pointer_size, 0));
mov(Operand(new_sp_reg, count_reg, times_system_pointer_size, 0), tmp_reg);
bind(&entry);
cmp(count_reg, Immediate(0));
j(not_equal, &loop, Label::kNear);
// Leave current frame.
mov(esp, new_sp_reg);
}
void MacroAssembler::InvokePrologue(const ParameterCount& expected,
const ParameterCount& actual, Label* done,
bool* definitely_mismatches,
InvokeFlag flag,
Label::Distance done_near) {
DCHECK_IMPLIES(expected.is_reg(), expected.reg() == ecx);
DCHECK_IMPLIES(actual.is_reg(), actual.reg() == eax);
bool definitely_matches = false;
*definitely_mismatches = false;
Label invoke;
if (expected.is_immediate()) {
DCHECK(actual.is_immediate());
mov(eax, actual.immediate());
if (expected.immediate() == actual.immediate()) {
definitely_matches = true;
} else {
const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
if (expected.immediate() == sentinel) {
// Don't worry about adapting arguments for builtins 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;
mov(ecx, 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.
mov(eax, actual.immediate());
cmp(expected.reg(), actual.immediate());
j(equal, &invoke);
DCHECK(expected.reg() == ecx);
} 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.
cmp(expected.reg(), actual.reg());
j(equal, &invoke);
DCHECK(actual.reg() == eax);
DCHECK(expected.reg() == ecx);
} else {
definitely_matches = true;
Move(eax, 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, done_near);
}
} 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());
push(eax);
cmpb(ExternalReferenceAsOperand(debug_hook_active, eax), Immediate(0));
pop(eax);
j(equal, &skip_hook);
{
FrameScope frame(this,
has_frame() ? StackFrame::NONE : StackFrame::INTERNAL);
if (expected.is_reg()) {
SmiTag(expected.reg());
Push(expected.reg());
}
if (actual.is_reg()) {
SmiTag(actual.reg());
Push(actual.reg());
SmiUntag(actual.reg());
}
if (new_target.is_valid()) {
Push(new_target);
}
Push(fun);
Push(fun);
Operand receiver_op =
actual.is_reg()
? Operand(ebp, actual.reg(), times_system_pointer_size,
kSystemPointerSize * 2)
: Operand(ebp, actual.immediate() * times_system_pointer_size +
kSystemPointerSize * 2);
Push(receiver_op);
CallRuntime(Runtime::kDebugOnFunctionCall);
Pop(fun);
if (new_target.is_valid()) {
Pop(new_target);
}
if (actual.is_reg()) {
Pop(actual.reg());
SmiUntag(actual.reg());
}
if (expected.is_reg()) {
Pop(expected.reg());
SmiUntag(expected.reg());
}
}
bind(&skip_hook);
}
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 == edi);
DCHECK_IMPLIES(new_target.is_valid(), new_target == edx);
DCHECK_IMPLIES(expected.is_reg(), expected.reg() == ecx);
DCHECK_IMPLIES(actual.is_reg(), actual.reg() == eax);
// 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()) {
Move(edx, isolate()->factory()->undefined_value());
}
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.
static_assert(kJavaScriptCallCodeStartRegister == ecx, "ABI mismatch");
mov(ecx, FieldOperand(function, JSFunction::kCodeOffset));
if (flag == CALL_FUNCTION) {
CallCodeObject(ecx);
} else {
DCHECK(flag == JUMP_FUNCTION);
JumpCodeObject(ecx);
}
bind(&done);
}
}
void MacroAssembler::InvokeFunction(Register fun, Register new_target,
const ParameterCount& actual,
InvokeFlag flag) {
// You can't call a function without a valid frame.
DCHECK(flag == JUMP_FUNCTION || has_frame());
DCHECK(fun == edi);
mov(ecx, FieldOperand(edi, JSFunction::kSharedFunctionInfoOffset));
mov(esi, FieldOperand(edi, JSFunction::kContextOffset));
movzx_w(ecx,
FieldOperand(ecx, SharedFunctionInfo::kFormalParameterCountOffset));
ParameterCount expected(ecx);
InvokeFunctionCode(edi, new_target, expected, actual, flag);
}
void MacroAssembler::LoadGlobalProxy(Register dst) {
mov(dst, NativeContextOperand());
mov(dst, ContextOperand(dst, Context::GLOBAL_PROXY_INDEX));
}
void MacroAssembler::LoadGlobalFunction(int index, Register function) {
// Load the native context from the current context.
mov(function, NativeContextOperand());
// Load the function from the native context.
mov(function, ContextOperand(function, index));
}
int MacroAssembler::SafepointRegisterStackIndex(int reg_code) {
// The registers are pushed starting with the lowest encoding,
// which means that lowest encodings are furthest away from
// the stack pointer.
DCHECK(reg_code >= 0 && reg_code < kNumSafepointRegisters);
return kNumSafepointRegisters - reg_code - 1;
}
void TurboAssembler::Ret() { ret(0); }
void TurboAssembler::Ret(int bytes_dropped, Register scratch) {
if (is_uint16(bytes_dropped)) {
ret(bytes_dropped);
} else {
pop(scratch);
add(esp, Immediate(bytes_dropped));
push(scratch);
ret(0);
}
}
void TurboAssembler::Push(Immediate value) {
if (root_array_available() && options().isolate_independent_code) {
if (value.is_embedded_object()) {
Push(HeapObjectAsOperand(value.embedded_object()));
return;
} else if (value.is_external_reference()) {
Push(ExternalReferenceAddressAsOperand(value.external_reference()));
return;
}
}
push(value);
}
void MacroAssembler::Drop(int stack_elements) {
if (stack_elements > 0) {
add(esp, Immediate(stack_elements * kSystemPointerSize));
}
}
void TurboAssembler::Move(Register dst, Register src) {
if (dst != src) {
mov(dst, src);
}
}
void TurboAssembler::Move(Register dst, const Immediate& src) {
if (!src.is_heap_object_request() && src.is_zero()) {
xor_(dst, dst); // Shorter than mov of 32-bit immediate 0.
} else if (src.is_external_reference()) {
LoadAddress(dst, src.external_reference());
} else {
mov(dst, src);
}
}
void TurboAssembler::Move(Operand dst, const Immediate& src) {
// Since there's no scratch register available, take a detour through the
// stack.
if (root_array_available() && options().isolate_independent_code) {
if (src.is_embedded_object() || src.is_external_reference() ||
src.is_heap_object_request()) {
Push(src);
pop(dst);
return;
}
}
if (src.is_embedded_object()) {
mov(dst, src.embedded_object());
} else {
mov(dst, src);
}
}
void TurboAssembler::Move(Register dst, Handle<HeapObject> src) {
if (root_array_available() && options().isolate_independent_code) {
IndirectLoadConstant(dst, src);
return;
}
mov(dst, src);
}
void TurboAssembler::Move(XMMRegister dst, uint32_t src) {
if (src == 0) {
pxor(dst, dst);
} else {
unsigned cnt = base::bits::CountPopulation(src);
unsigned nlz = base::bits::CountLeadingZeros32(src);
unsigned ntz = base::bits::CountTrailingZeros32(src);
if (nlz + cnt + ntz == 32) {
pcmpeqd(dst, dst);
if (ntz == 0) {
psrld(dst, 32 - cnt);
} else {
pslld(dst, 32 - cnt);
if (nlz != 0) psrld(dst, nlz);
}
} else {
push(eax);
mov(eax, Immediate(src));
movd(dst, Operand(eax));
pop(eax);
}
}
}
void TurboAssembler::Move(XMMRegister dst, uint64_t src) {
if (src == 0) {
pxor(dst, dst);
} else {
uint32_t lower = static_cast<uint32_t>(src);
uint32_t upper = static_cast<uint32_t>(src >> 32);
unsigned cnt = base::bits::CountPopulation(src);
unsigned nlz = base::bits::CountLeadingZeros64(src);
unsigned ntz = base::bits::CountTrailingZeros64(src);
if (nlz + cnt + ntz == 64) {
pcmpeqd(dst, dst);
if (ntz == 0) {
psrlq(dst, 64 - cnt);
} else {
psllq(dst, 64 - cnt);
if (nlz != 0) psrlq(dst, nlz);
}
} else if (lower == 0) {
Move(dst, upper);
psllq(dst, 32);
} else if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope scope(this, SSE4_1);
push(eax);
Move(eax, Immediate(lower));
movd(dst, Operand(eax));
if (upper != lower) {
Move(eax, Immediate(upper));
}
pinsrd(dst, Operand(eax), 1);
pop(eax);
} else {
push(Immediate(upper));
push(Immediate(lower));
movsd(dst, Operand(esp, 0));
add(esp, Immediate(kDoubleSize));
}
}
}
void TurboAssembler::Pshufhw(XMMRegister dst, Operand src, uint8_t shuffle) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpshufhw(dst, src, shuffle);
} else {
pshufhw(dst, src, shuffle);
}
}
void TurboAssembler::Pshuflw(XMMRegister dst, Operand src, uint8_t shuffle) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpshuflw(dst, src, shuffle);
} else {
pshuflw(dst, src, shuffle);
}
}
void TurboAssembler::Pshufd(XMMRegister dst, Operand src, uint8_t shuffle) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpshufd(dst, src, shuffle);
} else {
pshufd(dst, src, shuffle);
}
}
void TurboAssembler::Psraw(XMMRegister dst, uint8_t shift) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsraw(dst, dst, shift);
} else {
psraw(dst, shift);
}
}
void TurboAssembler::Psrlw(XMMRegister dst, uint8_t shift) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsrlw(dst, dst, shift);
} else {
psrlw(dst, shift);
}
}
void TurboAssembler::Psignb(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsignb(dst, dst, src);
return;
}
if (CpuFeatures::IsSupported(SSSE3)) {
CpuFeatureScope sse_scope(this, SSSE3);
psignb(dst, src);
return;
}
FATAL("no AVX or SSE3 support");
}
void TurboAssembler::Psignw(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsignw(dst, dst, src);
return;
}
if (CpuFeatures::IsSupported(SSSE3)) {
CpuFeatureScope sse_scope(this, SSSE3);
psignw(dst, src);
return;
}
FATAL("no AVX or SSE3 support");
}
void TurboAssembler::Psignd(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpsignd(dst, dst, src);
return;
}
if (CpuFeatures::IsSupported(SSSE3)) {
CpuFeatureScope sse_scope(this, SSSE3);
psignd(dst, src);
return;
}
FATAL("no AVX or SSE3 support");
}
void TurboAssembler::Pshufb(XMMRegister dst, Operand src) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpshufb(dst, dst, src);
return;
}
if (CpuFeatures::IsSupported(SSSE3)) {
CpuFeatureScope sse_scope(this, SSSE3);
pshufb(dst, src);
return;
}
FATAL("no AVX or SSE3 support");
}
void TurboAssembler::Pblendw(XMMRegister dst, Operand src, uint8_t imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpblendw(dst, dst, src, imm8);
return;
}
if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pblendw(dst, src, imm8);
return;
}
FATAL("no AVX or SSE4.1 support");
}
void TurboAssembler::Palignr(XMMRegister dst, Operand src, uint8_t imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpalignr(dst, dst, src, imm8);
return;
}
if (CpuFeatures::IsSupported(SSSE3)) {
CpuFeatureScope sse_scope(this, SSSE3);
palignr(dst, src, imm8);
return;
}
FATAL("no AVX or SSE3 support");
}
void TurboAssembler::Pextrb(Register dst, XMMRegister src, uint8_t imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpextrb(dst, src, imm8);
return;
}
if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pextrb(dst, src, imm8);
return;
}
FATAL("no AVX or SSE4.1 support");
}
void TurboAssembler::Pextrw(Register dst, XMMRegister src, uint8_t imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpextrw(dst, src, imm8);
return;
}
if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pextrw(dst, src, imm8);
return;
}
FATAL("no AVX or SSE4.1 support");
}
void TurboAssembler::Pextrd(Register dst, XMMRegister src, uint8_t imm8) {
if (imm8 == 0) {
Movd(dst, src);
return;
}
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpextrd(dst, src, imm8);
return;
}
if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pextrd(dst, src, imm8);
return;
}
// Without AVX or SSE, we can only have 64-bit values in xmm registers.
// We don't have an xmm scratch register, so move the data via the stack. This
// path is rarely required, so it's acceptable to be slow.
DCHECK_LT(imm8, 2);
AllocateStackSpace(kDoubleSize);
movsd(Operand(esp, 0), src);
mov(dst, Operand(esp, imm8 * kUInt32Size));
add(esp, Immediate(kDoubleSize));
}
void TurboAssembler::Pinsrd(XMMRegister dst, Operand src, uint8_t imm8) {
if (CpuFeatures::IsSupported(AVX)) {
CpuFeatureScope scope(this, AVX);
vpinsrd(dst, dst, src, imm8);
return;
}
if (CpuFeatures::IsSupported(SSE4_1)) {
CpuFeatureScope sse_scope(this, SSE4_1);
pinsrd(dst, src, imm8);
return;
}
// Without AVX or SSE, we can only have 64-bit values in xmm registers.
// We don't have an xmm scratch register, so move the data via the stack. This
// path is rarely required, so it's acceptable to be slow.
DCHECK_LT(imm8, 2);
AllocateStackSpace(kDoubleSize);
// Write original content of {dst} to the stack.
movsd(Operand(esp, 0), dst);
// Overwrite the portion specified in {imm8}.
if (src.is_reg_only()) {
mov(Operand(esp, imm8 * kUInt32Size), src.reg());
} else {
movss(dst, src);
movss(Operand(esp, imm8 * kUInt32Size), dst);
}
// Load back the full value into {dst}.
movsd(dst, Operand(esp, 0));
add(esp, Immediate(kDoubleSize));
}
void TurboAssembler::Lzcnt(Register dst, Operand src) {
if (CpuFeatures::IsSupported(LZCNT)) {
CpuFeatureScope scope(this, LZCNT);
lzcnt(dst, src);
return;
}
Label not_zero_src;
bsr(dst, src);
j(not_zero, ¬_zero_src, Label::kNear);
Move(dst, Immediate(63)); // 63^31 == 32
bind(¬_zero_src);
xor_(dst, Immediate(31)); // for x in [0..31], 31^x == 31-x.
}
void TurboAssembler::Tzcnt(Register dst, Operand src) {
if (CpuFeatures::IsSupported(BMI1)) {
CpuFeatureScope scope(this, BMI1);
tzcnt(dst, src);
return;
}
Label not_zero_src;
bsf(dst, src);
j(not_zero, ¬_zero_src, Label::kNear);
Move(dst, Immediate(32)); // The result of tzcnt is 32 if src = 0.
bind(¬_zero_src);
}
void TurboAssembler::Popcnt(Register dst, Operand src) {
if (CpuFeatures::IsSupported(POPCNT)) {
CpuFeatureScope scope(this, POPCNT);
popcnt(dst, src);
return;
}
FATAL("no POPCNT support");
}
void MacroAssembler::LoadWeakValue(Register in_out, Label* target_if_cleared) {
cmp(in_out, Immediate(kClearedWeakHeapObjectLower32));
j(equal, target_if_cleared);
and_(in_out, Immediate(~kWeakHeapObjectMask));
}
void MacroAssembler::IncrementCounter(StatsCounter* counter, int value,
Register scratch) {
DCHECK_GT(value, 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand operand =
ExternalReferenceAsOperand(ExternalReference::Create(counter), scratch);
if (value == 1) {
inc(operand);
} else {
add(operand, Immediate(value));
}
}
}
void MacroAssembler::DecrementCounter(StatsCounter* counter, int value,
Register scratch) {
DCHECK_GT(value, 0);
if (FLAG_native_code_counters && counter->Enabled()) {
Operand operand =
ExternalReferenceAsOperand(ExternalReference::Create(counter), scratch);
if (value == 1) {
dec(operand);
} else {
sub(operand, Immediate(value));
}
}
}
void TurboAssembler::Assert(Condition cc, AbortReason reason) {
if (emit_debug_code()) Check(cc, reason);
}
void TurboAssembler::AssertUnreachable(AbortReason reason) {
if (emit_debug_code()) Abort(reason);
}
void TurboAssembler::Check(Condition cc, AbortReason reason) {
Label L;
j(cc, &L);
Abort(reason);
// will not return here
bind(&L);
}
void TurboAssembler::CheckStackAlignment() {
int frame_alignment = base::OS::ActivationFrameAlignment();
int frame_alignment_mask = frame_alignment - 1;
if (frame_alignment > kSystemPointerSize) {
DCHECK(base::bits::IsPowerOfTwo(frame_alignment));
Label alignment_as_expected;
test(esp, Immediate(frame_alignment_mask));
j(zero, &alignment_as_expected);
// Abort if stack is not aligned.
int3();
bind(&alignment_as_expected);
}
}
void TurboAssembler::Abort(AbortReason reason) {
#ifdef DEBUG
const char* msg = GetAbortReason(reason);
RecordComment("Abort message: ");
RecordComment(msg);
#endif
// Avoid emitting call to builtin if requested.
if (trap_on_abort()) {
int3();
return;
}
if (should_abort_hard()) {
// We don't care if we constructed a frame. Just pretend we did.
FrameScope assume_frame(this, StackFrame::NONE);
PrepareCallCFunction(1, eax);
mov(Operand(esp, 0), Immediate(static_cast<int>(reason)));
CallCFunction(ExternalReference::abort_with_reason(), 1);
return;
}
Move(edx, Smi::FromInt(static_cast<int>(reason)));
// Disable stub call restrictions to always allow calls to abort.
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);
}
// will not return here
int3();
}
void TurboAssembler::PrepareCallCFunction(int num_arguments, Register scratch) {
int frame_alignment = base::OS::ActivationFrameAlignment();
if (frame_alignment != 0) {
// Make stack end at alignment and make room for num_arguments words
// and the original value of esp.
mov(scratch, esp);
AllocateStackSpace((num_arguments + 1) * kSystemPointerSize);
DCHECK(base::bits::IsPowerOfTwo(frame_alignment));
and_(esp, -frame_alignment);
mov(Operand(esp, num_arguments * kSystemPointerSize), scratch);
} else {
AllocateStackSpace(num_arguments * kSystemPointerSize);
}
}
void TurboAssembler::CallCFunction(ExternalReference function,
int num_arguments) {
// Trashing eax is ok as it will be the return value.
Move(eax, Immediate(function));
CallCFunction(eax, num_arguments);
}
void TurboAssembler::CallCFunction(Register function, int num_arguments) {
DCHECK_LE(num_arguments, kMaxCParameters);
DCHECK(has_frame());
// Check stack alignment.
if (emit_debug_code()) {
CheckStackAlignment();
}
// Save the frame pointer and PC so that the stack layout remains iterable,
// even without an ExitFrame which normally exists between JS and C frames.
if (isolate() != nullptr) {
// Find two caller-saved scratch registers.
Register scratch1 = eax;
Register scratch2 = ecx;
if (function == eax) scratch1 = edx;
if (function == ecx) scratch2 = edx;
PushPC();
pop(scratch1);
mov(ExternalReferenceAsOperand(
ExternalReference::fast_c_call_caller_pc_address(isolate()),
scratch2),
scratch1);
mov(ExternalReferenceAsOperand(
ExternalReference::fast_c_call_caller_fp_address(isolate()),
scratch2),
ebp);
}
call(function);
if (isolate() != nullptr) {
// We don't unset the PC; the FP is the source of truth.
mov(ExternalReferenceAsOperand(
ExternalReference::fast_c_call_caller_fp_address(isolate()), edx),
Immediate(0));
}
if (base::OS::ActivationFrameAlignment() != 0) {
mov(esp, Operand(esp, num_arguments * kSystemPointerSize));
} else {
add(esp, Immediate(num_arguments * kSystemPointerSize));
}
}
void TurboAssembler::PushPC() {
// Push the current PC onto the stack as "return address" via calling
// the next instruction.
Label get_pc;
call(&get_pc);
bind(&get_pc);
}
void TurboAssembler::Call(Handle<Code> code_object, RelocInfo::Mode rmode) {
DCHECK_IMPLIES(options().isolate_independent_code,
Builtins::IsIsolateIndependentBuiltin(*code_object));
if (options().inline_offheap_trampolines) {
int builtin_index = Builtins::kNoBuiltinId;
if (isolate()->builtins()->IsBuiltinHandle(code_object, &builtin_index) &&
Builtins::IsIsolateIndependent(builtin_index)) {
// Inline the trampoline.
CallBuiltin(builtin_index);
return;
}
}
DCHECK(RelocInfo::IsCodeTarget(rmode));
call(code_object, rmode);
}
void TurboAssembler::LoadEntryFromBuiltinIndex(Register builtin_index) {
STATIC_ASSERT(kSystemPointerSize == 4);
STATIC_ASSERT(kSmiShiftSize == 0);
STATIC_ASSERT(kSmiTagSize == 1);
STATIC_ASSERT(kSmiTag == 0);
// The builtin_index register contains the builtin index as a Smi.
// Untagging is folded into the indexing operand below (we use
// times_half_system_pointer_size instead of times_system_pointer_size since
// smis are already shifted by one).
mov(builtin_index,
Operand(kRootRegister, builtin_index, times_half_system_pointer_size,
IsolateData::builtin_entry_table_offset()));
}
void TurboAssembler::CallBuiltinByIndex(Register builtin_index) {
LoadEntryFromBuiltinIndex(builtin_index);
call(builtin_index);
}
void TurboAssembler::CallBuiltin(int builtin_index) {
DCHECK(Builtins::IsBuiltinId(builtin_index));
DCHECK(FLAG_embedded_builtins);
RecordCommentForOffHeapTrampoline(builtin_index);
CHECK_NE(builtin_index, Builtins::kNoBuiltinId);
EmbeddedData d = EmbeddedData::FromBlob();
Address entry = d.InstructionStartOfBuiltin(builtin_index);
call(entry, RelocInfo::OFF_HEAP_TARGET);
}
void TurboAssembler::LoadCodeObjectEntry(Register destination,
Register code_object) {
// Code objects are called differently depending on whether we are generating
// builtin code (which will later be embedded into the binary) or compiling
// user JS code at runtime.
// * Builtin code runs in --jitless mode and thus must not call into on-heap
// Code targets. Instead, we dispatch through the builtins entry table.
// * Codegen at runtime does not have this restriction and we can use the
// shorter, branchless instruction sequence. The assumption here is that
// targets are usually generated code and not builtin Code objects.
if (options().isolate_independent_code) {
DCHECK(root_array_available());
Label if_code_is_off_heap, out;
// Check whether the Code object is an off-heap trampoline. If so, call its
// (off-heap) entry point directly without going through the (on-heap)
// trampoline. Otherwise, just call the Code object as always.
test(FieldOperand(code_object, Code::kFlagsOffset),
Immediate(Code::IsOffHeapTrampoline::kMask));
j(not_equal, &if_code_is_off_heap);
// Not an off-heap trampoline, the entry point is at
// Code::raw_instruction_start().
Move(destination, code_object);
add(destination, Immediate(Code::kHeaderSize - kHeapObjectTag));
jmp(&out);
// An off-heap trampoline, the entry point is loaded from the builtin entry
// table.
bind(&if_code_is_off_heap);
mov(destination, FieldOperand(code_object, Code::kBuiltinIndexOffset));
mov(destination,
Operand(kRootRegister, destination, times_system_pointer_size,
IsolateData::builtin_entry_table_offset()));
bind(&out);
} else {
Move(destination, code_object);
add(destination, Immediate(Code::kHeaderSize - kHeapObjectTag));
}
}
void TurboAssembler::CallCodeObject(Register code_object) {
LoadCodeObjectEntry(code_object, code_object);
call(code_object);
}
void TurboAssembler::JumpCodeObject(Register code_object) {
LoadCodeObjectEntry(code_object, code_object);
jmp(code_object);
}
void TurboAssembler::Jump(const ExternalReference& reference) {
DCHECK(root_array_available());
jmp(Operand(kRootRegister, RootRegisterOffsetForExternalReferenceTableEntry(
isolate(), reference)));
}
void TurboAssembler::Jump(Handle<Code> code_object, RelocInfo::Mode rmode) {
DCHECK_IMPLIES(options().isolate_independent_code,
Builtins::IsIsolateIndependentBuiltin(*code_object));
if (options().inline_offheap_trampolines) {
int builtin_index = Builtins::kNoBuiltinId;
if (isolate()->builtins()->IsBuiltinHandle(code_object, &builtin_index) &&
Builtins::IsIsolateIndependent(builtin_index)) {
// Inline the trampoline.
RecordCommentForOffHeapTrampoline(builtin_index);
CHECK_NE(builtin_index, Builtins::kNoBuiltinId);
EmbeddedData d = EmbeddedData::FromBlob();
Address entry = d.InstructionStartOfBuiltin(builtin_index);
jmp(entry, RelocInfo::OFF_HEAP_TARGET);
return;
}
}
DCHECK(RelocInfo::IsCodeTarget(rmode));
jmp(code_object, rmode);
}
void TurboAssembler::RetpolineCall(Register reg) {
Label setup_return, setup_target, inner_indirect_branch, capture_spec;
jmp(&setup_return); // Jump past the entire retpoline below.
bind(&inner_indirect_branch);
call(&setup_target);
bind(&capture_spec);
pause();
jmp(&capture_spec);
bind(&setup_target);
mov(Operand(esp, 0), reg);
ret(0);
bind(&setup_return);
call(&inner_indirect_branch); // Callee will return after this instruction.
}
void TurboAssembler::RetpolineCall(Address destination, RelocInfo::Mode rmode) {
Label setup_return, setup_target, inner_indirect_branch, capture_spec;
jmp(&setup_return); // Jump past the entire retpoline below.
bind(&inner_indirect_branch);
call(&setup_target);
bind(&capture_spec);
pause();
jmp(&capture_spec);
bind(&setup_target);
mov(Operand(esp, 0), destination, rmode);
ret(0);
bind(&setup_return);
call(&inner_indirect_branch); // Callee will return after this instruction.
}
void TurboAssembler::RetpolineJump(Register reg) {
Label setup_target, capture_spec;
call(&setup_target);
bind(&capture_spec);
pause();
jmp(&capture_spec);
bind(&setup_target);
mov(Operand(esp, 0), reg);
ret(0);
}
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) {
and_(scratch, Immediate(~kPageAlignmentMask));
} else {
mov(scratch, Immediate(~kPageAlignmentMask));
and_(scratch, object);
}
if (mask < (1 << kBitsPerByte)) {
test_b(Operand(scratch, MemoryChunk::kFlagsOffset), Immediate(mask));
} else {
test(Operand(scratch, MemoryChunk::kFlagsOffset), Immediate(mask));
}
j(cc, condition_met, condition_met_distance);
}
void TurboAssembler::ComputeCodeStartAddress(Register dst) {
// In order to get the address of the current instruction, we first need
// to use a call and then use a pop, thus pushing the return address to
// the stack and then popping it into the register.
Label current;
call(¤t);
int pc = pc_offset();
bind(¤t);
pop(dst);
if (pc != 0) {
sub(dst, Immediate(pc));
}
}
void TurboAssembler::CallForDeoptimization(Address target, int deopt_id) {
NoRootArrayScope no_root_array(this);
// Save the deopt id in ebx (we don't need the roots array from now on).
mov(ebx, deopt_id);
call(target, RelocInfo::RUNTIME_ENTRY);
}
} // namespace internal
} // namespace v8
#endif // V8_TARGET_ARCH_IA32