// 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.
#include "src/crankshaft/mips64/lithium-codegen-mips64.h"
#include "src/builtins/builtins-constructor.h"
#include "src/code-factory.h"
#include "src/code-stubs.h"
#include "src/crankshaft/hydrogen-osr.h"
#include "src/crankshaft/mips64/lithium-gap-resolver-mips64.h"
#include "src/ic/ic.h"
#include "src/ic/stub-cache.h"
namespace v8 {
namespace internal {
class SafepointGenerator final : public CallWrapper {
public:
SafepointGenerator(LCodeGen* codegen,
LPointerMap* pointers,
Safepoint::DeoptMode mode)
: codegen_(codegen),
pointers_(pointers),
deopt_mode_(mode) { }
virtual ~SafepointGenerator() {}
void BeforeCall(int call_size) const override {}
void AfterCall() const override {
codegen_->RecordSafepoint(pointers_, deopt_mode_);
}
private:
LCodeGen* codegen_;
LPointerMap* pointers_;
Safepoint::DeoptMode deopt_mode_;
};
LCodeGen::PushSafepointRegistersScope::PushSafepointRegistersScope(
LCodeGen* codegen)
: codegen_(codegen) {
DCHECK(codegen_->info()->is_calling());
DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
StoreRegistersStateStub stub(codegen_->isolate());
codegen_->masm_->push(ra);
codegen_->masm_->CallStub(&stub);
}
LCodeGen::PushSafepointRegistersScope::~PushSafepointRegistersScope() {
DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
RestoreRegistersStateStub stub(codegen_->isolate());
codegen_->masm_->push(ra);
codegen_->masm_->CallStub(&stub);
codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
}
#define __ masm()->
bool LCodeGen::GenerateCode() {
LPhase phase("Z_Code generation", chunk());
DCHECK(is_unused());
status_ = GENERATING;
// Open a frame scope to indicate that there is a frame on the stack. The
// NONE indicates that the scope shouldn't actually generate code to set up
// the frame (that is done in GeneratePrologue).
FrameScope frame_scope(masm_, StackFrame::NONE);
return GeneratePrologue() && GenerateBody() && GenerateDeferredCode() &&
GenerateJumpTable() && GenerateSafepointTable();
}
void LCodeGen::FinishCode(Handle<Code> code) {
DCHECK(is_done());
code->set_stack_slots(GetTotalFrameSlotCount());
code->set_safepoint_table_offset(safepoints_.GetCodeOffset());
PopulateDeoptimizationData(code);
}
void LCodeGen::SaveCallerDoubles() {
DCHECK(info()->saves_caller_doubles());
DCHECK(NeedsEagerFrame());
Comment(";;; Save clobbered callee double registers");
int count = 0;
BitVector* doubles = chunk()->allocated_double_registers();
BitVector::Iterator save_iterator(doubles);
while (!save_iterator.Done()) {
__ sdc1(DoubleRegister::from_code(save_iterator.Current()),
MemOperand(sp, count * kDoubleSize));
save_iterator.Advance();
count++;
}
}
void LCodeGen::RestoreCallerDoubles() {
DCHECK(info()->saves_caller_doubles());
DCHECK(NeedsEagerFrame());
Comment(";;; Restore clobbered callee double registers");
BitVector* doubles = chunk()->allocated_double_registers();
BitVector::Iterator save_iterator(doubles);
int count = 0;
while (!save_iterator.Done()) {
__ ldc1(DoubleRegister::from_code(save_iterator.Current()),
MemOperand(sp, count * kDoubleSize));
save_iterator.Advance();
count++;
}
}
bool LCodeGen::GeneratePrologue() {
DCHECK(is_generating());
if (info()->IsOptimizing()) {
ProfileEntryHookStub::MaybeCallEntryHook(masm_);
// a1: Callee's JS function.
// cp: Callee's context.
// fp: Caller's frame pointer.
// lr: Caller's pc.
}
info()->set_prologue_offset(masm_->pc_offset());
if (NeedsEagerFrame()) {
if (info()->IsStub()) {
__ StubPrologue(StackFrame::STUB);
} else {
__ Prologue(info()->GeneratePreagedPrologue());
}
frame_is_built_ = true;
}
// Reserve space for the stack slots needed by the code.
int slots = GetStackSlotCount();
if (slots > 0) {
if (FLAG_debug_code) {
__ Dsubu(sp, sp, Operand(slots * kPointerSize));
__ Push(a0, a1);
__ Daddu(a0, sp, Operand(slots * kPointerSize));
__ li(a1, Operand(kSlotsZapValue));
Label loop;
__ bind(&loop);
__ Dsubu(a0, a0, Operand(kPointerSize));
__ sd(a1, MemOperand(a0, 2 * kPointerSize));
__ Branch(&loop, ne, a0, Operand(sp));
__ Pop(a0, a1);
} else {
__ Dsubu(sp, sp, Operand(slots * kPointerSize));
}
}
if (info()->saves_caller_doubles()) {
SaveCallerDoubles();
}
return !is_aborted();
}
void LCodeGen::DoPrologue(LPrologue* instr) {
Comment(";;; Prologue begin");
// Possibly allocate a local context.
if (info()->scope()->NeedsContext()) {
Comment(";;; Allocate local context");
bool need_write_barrier = true;
// Argument to NewContext is the function, which is in a1.
int slots = info()->scope()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
Safepoint::DeoptMode deopt_mode = Safepoint::kNoLazyDeopt;
if (info()->scope()->is_script_scope()) {
__ push(a1);
__ Push(info()->scope()->scope_info());
__ CallRuntime(Runtime::kNewScriptContext);
deopt_mode = Safepoint::kLazyDeopt;
} else {
if (slots <=
ConstructorBuiltinsAssembler::MaximumFunctionContextSlots()) {
Callable callable = CodeFactory::FastNewFunctionContext(
isolate(), info()->scope()->scope_type());
__ li(FastNewFunctionContextDescriptor::SlotsRegister(),
Operand(slots));
__ Call(callable.code(), RelocInfo::CODE_TARGET);
// Result of the FastNewFunctionContext builtin is always in new space.
need_write_barrier = false;
} else {
__ push(a1);
__ Push(Smi::FromInt(info()->scope()->scope_type()));
__ CallRuntime(Runtime::kNewFunctionContext);
}
}
RecordSafepoint(deopt_mode);
// Context is returned in both v0. It replaces the context passed to us.
// It's saved in the stack and kept live in cp.
__ mov(cp, v0);
__ sd(v0, MemOperand(fp, StandardFrameConstants::kContextOffset));
// Copy any necessary parameters into the context.
int num_parameters = info()->scope()->num_parameters();
int first_parameter = info()->scope()->has_this_declaration() ? -1 : 0;
for (int i = first_parameter; i < num_parameters; i++) {
Variable* var = (i == -1) ? info()->scope()->receiver()
: info()->scope()->parameter(i);
if (var->IsContextSlot()) {
int parameter_offset = StandardFrameConstants::kCallerSPOffset +
(num_parameters - 1 - i) * kPointerSize;
// Load parameter from stack.
__ ld(a0, MemOperand(fp, parameter_offset));
// Store it in the context.
MemOperand target = ContextMemOperand(cp, var->index());
__ sd(a0, target);
// Update the write barrier. This clobbers a3 and a0.
if (need_write_barrier) {
__ RecordWriteContextSlot(
cp, target.offset(), a0, a3, GetRAState(), kSaveFPRegs);
} else if (FLAG_debug_code) {
Label done;
__ JumpIfInNewSpace(cp, a0, &done);
__ Abort(kExpectedNewSpaceObject);
__ bind(&done);
}
}
}
Comment(";;; End allocate local context");
}
Comment(";;; Prologue end");
}
void LCodeGen::GenerateOsrPrologue() {
// Generate the OSR entry prologue at the first unknown OSR value, or if there
// are none, at the OSR entrypoint instruction.
if (osr_pc_offset_ >= 0) return;
osr_pc_offset_ = masm()->pc_offset();
// Adjust the frame size, subsuming the unoptimized frame into the
// optimized frame.
int slots = GetStackSlotCount() - graph()->osr()->UnoptimizedFrameSlots();
DCHECK(slots >= 0);
__ Dsubu(sp, sp, Operand(slots * kPointerSize));
}
void LCodeGen::GenerateBodyInstructionPre(LInstruction* instr) {
if (instr->IsCall()) {
EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
}
if (!instr->IsLazyBailout() && !instr->IsGap()) {
safepoints_.BumpLastLazySafepointIndex();
}
}
bool LCodeGen::GenerateDeferredCode() {
DCHECK(is_generating());
if (deferred_.length() > 0) {
for (int i = 0; !is_aborted() && i < deferred_.length(); i++) {
LDeferredCode* code = deferred_[i];
HValue* value =
instructions_->at(code->instruction_index())->hydrogen_value();
RecordAndWritePosition(value->position());
Comment(";;; <@%d,#%d> "
"-------------------- Deferred %s --------------------",
code->instruction_index(),
code->instr()->hydrogen_value()->id(),
code->instr()->Mnemonic());
__ bind(code->entry());
if (NeedsDeferredFrame()) {
Comment(";;; Build frame");
DCHECK(!frame_is_built_);
DCHECK(info()->IsStub());
frame_is_built_ = true;
__ li(scratch0(), Operand(StackFrame::TypeToMarker(StackFrame::STUB)));
__ PushCommonFrame(scratch0());
Comment(";;; Deferred code");
}
code->Generate();
if (NeedsDeferredFrame()) {
Comment(";;; Destroy frame");
DCHECK(frame_is_built_);
__ PopCommonFrame(scratch0());
frame_is_built_ = false;
}
__ jmp(code->exit());
}
}
// Deferred code is the last part of the instruction sequence. Mark
// the generated code as done unless we bailed out.
if (!is_aborted()) status_ = DONE;
return !is_aborted();
}
bool LCodeGen::GenerateJumpTable() {
if (jump_table_.length() > 0) {
Comment(";;; -------------------- Jump table --------------------");
Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
Label table_start, call_deopt_entry;
__ bind(&table_start);
Label needs_frame;
Address base = jump_table_[0]->address;
for (int i = 0; i < jump_table_.length(); i++) {
Deoptimizer::JumpTableEntry* table_entry = jump_table_[i];
__ bind(&table_entry->label);
Address entry = table_entry->address;
DeoptComment(table_entry->deopt_info);
// Second-level deopt table entries are contiguous and small, so instead
// of loading the full, absolute address of each one, load the base
// address and add an immediate offset.
if (is_int16(entry - base)) {
if (table_entry->needs_frame) {
DCHECK(!info()->saves_caller_doubles());
Comment(";;; call deopt with frame");
__ PushCommonFrame();
__ BranchAndLink(&needs_frame, USE_DELAY_SLOT);
__ li(t9, Operand(entry - base));
} else {
__ BranchAndLink(&call_deopt_entry, USE_DELAY_SLOT);
__ li(t9, Operand(entry - base));
}
} else {
__ li(t9, Operand(entry - base));
if (table_entry->needs_frame) {
DCHECK(!info()->saves_caller_doubles());
Comment(";;; call deopt with frame");
__ PushCommonFrame();
__ BranchAndLink(&needs_frame);
} else {
__ BranchAndLink(&call_deopt_entry);
}
}
}
if (needs_frame.is_linked()) {
__ bind(&needs_frame);
// This variant of deopt can only be used with stubs. Since we don't
// have a function pointer to install in the stack frame that we're
// building, install a special marker there instead.
__ li(at, Operand(StackFrame::TypeToMarker(StackFrame::STUB)));
__ push(at);
DCHECK(info()->IsStub());
}
Comment(";;; call deopt");
__ bind(&call_deopt_entry);
if (info()->saves_caller_doubles()) {
DCHECK(info()->IsStub());
RestoreCallerDoubles();
}
__ li(at,
Operand(reinterpret_cast<int64_t>(base), RelocInfo::RUNTIME_ENTRY));
__ Daddu(t9, t9, Operand(at));
__ Jump(t9);
}
// The deoptimization jump table is the last part of the instruction
// sequence. Mark the generated code as done unless we bailed out.
if (!is_aborted()) status_ = DONE;
return !is_aborted();
}
bool LCodeGen::GenerateSafepointTable() {
DCHECK(is_done());
safepoints_.Emit(masm(), GetTotalFrameSlotCount());
return !is_aborted();
}
Register LCodeGen::ToRegister(int index) const {
return Register::from_code(index);
}
DoubleRegister LCodeGen::ToDoubleRegister(int index) const {
return DoubleRegister::from_code(index);
}
Register LCodeGen::ToRegister(LOperand* op) const {
DCHECK(op->IsRegister());
return ToRegister(op->index());
}
Register LCodeGen::EmitLoadRegister(LOperand* op, Register scratch) {
if (op->IsRegister()) {
return ToRegister(op->index());
} else if (op->IsConstantOperand()) {
LConstantOperand* const_op = LConstantOperand::cast(op);
HConstant* constant = chunk_->LookupConstant(const_op);
Handle<Object> literal = constant->handle(isolate());
Representation r = chunk_->LookupLiteralRepresentation(const_op);
if (r.IsInteger32()) {
AllowDeferredHandleDereference get_number;
DCHECK(literal->IsNumber());
__ li(scratch, Operand(static_cast<int32_t>(literal->Number())));
} else if (r.IsSmi()) {
DCHECK(constant->HasSmiValue());
__ li(scratch, Operand(Smi::FromInt(constant->Integer32Value())));
} else if (r.IsDouble()) {
Abort(kEmitLoadRegisterUnsupportedDoubleImmediate);
} else {
DCHECK(r.IsSmiOrTagged());
__ li(scratch, literal);
}
return scratch;
} else if (op->IsStackSlot()) {
__ ld(scratch, ToMemOperand(op));
return scratch;
}
UNREACHABLE();
return scratch;
}
DoubleRegister LCodeGen::ToDoubleRegister(LOperand* op) const {
DCHECK(op->IsDoubleRegister());
return ToDoubleRegister(op->index());
}
DoubleRegister LCodeGen::EmitLoadDoubleRegister(LOperand* op,
FloatRegister flt_scratch,
DoubleRegister dbl_scratch) {
if (op->IsDoubleRegister()) {
return ToDoubleRegister(op->index());
} else if (op->IsConstantOperand()) {
LConstantOperand* const_op = LConstantOperand::cast(op);
HConstant* constant = chunk_->LookupConstant(const_op);
Handle<Object> literal = constant->handle(isolate());
Representation r = chunk_->LookupLiteralRepresentation(const_op);
if (r.IsInteger32()) {
DCHECK(literal->IsNumber());
__ li(at, Operand(static_cast<int32_t>(literal->Number())));
__ mtc1(at, flt_scratch);
__ cvt_d_w(dbl_scratch, flt_scratch);
return dbl_scratch;
} else if (r.IsDouble()) {
Abort(kUnsupportedDoubleImmediate);
} else if (r.IsTagged()) {
Abort(kUnsupportedTaggedImmediate);
}
} else if (op->IsStackSlot()) {
MemOperand mem_op = ToMemOperand(op);
__ ldc1(dbl_scratch, mem_op);
return dbl_scratch;
}
UNREACHABLE();
return dbl_scratch;
}
Handle<Object> LCodeGen::ToHandle(LConstantOperand* op) const {
HConstant* constant = chunk_->LookupConstant(op);
DCHECK(chunk_->LookupLiteralRepresentation(op).IsSmiOrTagged());
return constant->handle(isolate());
}
bool LCodeGen::IsInteger32(LConstantOperand* op) const {
return chunk_->LookupLiteralRepresentation(op).IsSmiOrInteger32();
}
bool LCodeGen::IsSmi(LConstantOperand* op) const {
return chunk_->LookupLiteralRepresentation(op).IsSmi();
}
int32_t LCodeGen::ToInteger32(LConstantOperand* op) const {
// return ToRepresentation(op, Representation::Integer32());
HConstant* constant = chunk_->LookupConstant(op);
return constant->Integer32Value();
}
int64_t LCodeGen::ToRepresentation_donotuse(LConstantOperand* op,
const Representation& r) const {
HConstant* constant = chunk_->LookupConstant(op);
int32_t value = constant->Integer32Value();
if (r.IsInteger32()) return value;
DCHECK(r.IsSmiOrTagged());
return reinterpret_cast<int64_t>(Smi::FromInt(value));
}
Smi* LCodeGen::ToSmi(LConstantOperand* op) const {
HConstant* constant = chunk_->LookupConstant(op);
return Smi::FromInt(constant->Integer32Value());
}
double LCodeGen::ToDouble(LConstantOperand* op) const {
HConstant* constant = chunk_->LookupConstant(op);
DCHECK(constant->HasDoubleValue());
return constant->DoubleValue();
}
Operand LCodeGen::ToOperand(LOperand* op) {
if (op->IsConstantOperand()) {
LConstantOperand* const_op = LConstantOperand::cast(op);
HConstant* constant = chunk()->LookupConstant(const_op);
Representation r = chunk_->LookupLiteralRepresentation(const_op);
if (r.IsSmi()) {
DCHECK(constant->HasSmiValue());
return Operand(Smi::FromInt(constant->Integer32Value()));
} else if (r.IsInteger32()) {
DCHECK(constant->HasInteger32Value());
return Operand(constant->Integer32Value());
} else if (r.IsDouble()) {
Abort(kToOperandUnsupportedDoubleImmediate);
}
DCHECK(r.IsTagged());
return Operand(constant->handle(isolate()));
} else if (op->IsRegister()) {
return Operand(ToRegister(op));
} else if (op->IsDoubleRegister()) {
Abort(kToOperandIsDoubleRegisterUnimplemented);
return Operand((int64_t)0);
}
// Stack slots not implemented, use ToMemOperand instead.
UNREACHABLE();
return Operand((int64_t)0);
}
static int ArgumentsOffsetWithoutFrame(int index) {
DCHECK(index < 0);
return -(index + 1) * kPointerSize;
}
MemOperand LCodeGen::ToMemOperand(LOperand* op) const {
DCHECK(!op->IsRegister());
DCHECK(!op->IsDoubleRegister());
DCHECK(op->IsStackSlot() || op->IsDoubleStackSlot());
if (NeedsEagerFrame()) {
return MemOperand(fp, FrameSlotToFPOffset(op->index()));
} else {
// Retrieve parameter without eager stack-frame relative to the
// stack-pointer.
return MemOperand(sp, ArgumentsOffsetWithoutFrame(op->index()));
}
}
MemOperand LCodeGen::ToHighMemOperand(LOperand* op) const {
DCHECK(op->IsDoubleStackSlot());
if (NeedsEagerFrame()) {
// return MemOperand(fp, FrameSlotToFPOffset(op->index()) + kPointerSize);
return MemOperand(fp, FrameSlotToFPOffset(op->index()) + kIntSize);
} else {
// Retrieve parameter without eager stack-frame relative to the
// stack-pointer.
// return MemOperand(
// sp, ArgumentsOffsetWithoutFrame(op->index()) + kPointerSize);
return MemOperand(
sp, ArgumentsOffsetWithoutFrame(op->index()) + kIntSize);
}
}
void LCodeGen::WriteTranslation(LEnvironment* environment,
Translation* translation) {
if (environment == NULL) return;
// The translation includes one command per value in the environment.
int translation_size = environment->translation_size();
WriteTranslation(environment->outer(), translation);
WriteTranslationFrame(environment, translation);
int object_index = 0;
int dematerialized_index = 0;
for (int i = 0; i < translation_size; ++i) {
LOperand* value = environment->values()->at(i);
AddToTranslation(
environment, translation, value, environment->HasTaggedValueAt(i),
environment->HasUint32ValueAt(i), &object_index, &dematerialized_index);
}
}
void LCodeGen::AddToTranslation(LEnvironment* environment,
Translation* translation,
LOperand* op,
bool is_tagged,
bool is_uint32,
int* object_index_pointer,
int* dematerialized_index_pointer) {
if (op == LEnvironment::materialization_marker()) {
int object_index = (*object_index_pointer)++;
if (environment->ObjectIsDuplicateAt(object_index)) {
int dupe_of = environment->ObjectDuplicateOfAt(object_index);
translation->DuplicateObject(dupe_of);
return;
}
int object_length = environment->ObjectLengthAt(object_index);
if (environment->ObjectIsArgumentsAt(object_index)) {
translation->BeginArgumentsObject(object_length);
} else {
translation->BeginCapturedObject(object_length);
}
int dematerialized_index = *dematerialized_index_pointer;
int env_offset = environment->translation_size() + dematerialized_index;
*dematerialized_index_pointer += object_length;
for (int i = 0; i < object_length; ++i) {
LOperand* value = environment->values()->at(env_offset + i);
AddToTranslation(environment,
translation,
value,
environment->HasTaggedValueAt(env_offset + i),
environment->HasUint32ValueAt(env_offset + i),
object_index_pointer,
dematerialized_index_pointer);
}
return;
}
if (op->IsStackSlot()) {
int index = op->index();
if (is_tagged) {
translation->StoreStackSlot(index);
} else if (is_uint32) {
translation->StoreUint32StackSlot(index);
} else {
translation->StoreInt32StackSlot(index);
}
} else if (op->IsDoubleStackSlot()) {
int index = op->index();
translation->StoreDoubleStackSlot(index);
} else if (op->IsRegister()) {
Register reg = ToRegister(op);
if (is_tagged) {
translation->StoreRegister(reg);
} else if (is_uint32) {
translation->StoreUint32Register(reg);
} else {
translation->StoreInt32Register(reg);
}
} else if (op->IsDoubleRegister()) {
DoubleRegister reg = ToDoubleRegister(op);
translation->StoreDoubleRegister(reg);
} else if (op->IsConstantOperand()) {
HConstant* constant = chunk()->LookupConstant(LConstantOperand::cast(op));
int src_index = DefineDeoptimizationLiteral(constant->handle(isolate()));
translation->StoreLiteral(src_index);
} else {
UNREACHABLE();
}
}
void LCodeGen::CallCode(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr) {
CallCodeGeneric(code, mode, instr, RECORD_SIMPLE_SAFEPOINT);
}
void LCodeGen::CallCodeGeneric(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr,
SafepointMode safepoint_mode) {
DCHECK(instr != NULL);
__ Call(code, mode);
RecordSafepointWithLazyDeopt(instr, safepoint_mode);
}
void LCodeGen::CallRuntime(const Runtime::Function* function,
int num_arguments,
LInstruction* instr,
SaveFPRegsMode save_doubles) {
DCHECK(instr != NULL);
__ CallRuntime(function, num_arguments, save_doubles);
RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT);
}
void LCodeGen::LoadContextFromDeferred(LOperand* context) {
if (context->IsRegister()) {
__ Move(cp, ToRegister(context));
} else if (context->IsStackSlot()) {
__ ld(cp, ToMemOperand(context));
} else if (context->IsConstantOperand()) {
HConstant* constant =
chunk_->LookupConstant(LConstantOperand::cast(context));
__ li(cp, Handle<Object>::cast(constant->handle(isolate())));
} else {
UNREACHABLE();
}
}
void LCodeGen::CallRuntimeFromDeferred(Runtime::FunctionId id,
int argc,
LInstruction* instr,
LOperand* context) {
LoadContextFromDeferred(context);
__ CallRuntimeSaveDoubles(id);
RecordSafepointWithRegisters(
instr->pointer_map(), argc, Safepoint::kNoLazyDeopt);
}
void LCodeGen::RegisterEnvironmentForDeoptimization(LEnvironment* environment,
Safepoint::DeoptMode mode) {
environment->set_has_been_used();
if (!environment->HasBeenRegistered()) {
// Physical stack frame layout:
// -x ............. -4 0 ..................................... y
// [incoming arguments] [spill slots] [pushed outgoing arguments]
// Layout of the environment:
// 0 ..................................................... size-1
// [parameters] [locals] [expression stack including arguments]
// Layout of the translation:
// 0 ........................................................ size - 1 + 4
// [expression stack including arguments] [locals] [4 words] [parameters]
// |>------------ translation_size ------------<|
int frame_count = 0;
int jsframe_count = 0;
for (LEnvironment* e = environment; e != NULL; e = e->outer()) {
++frame_count;
if (e->frame_type() == JS_FUNCTION) {
++jsframe_count;
}
}
Translation translation(&translations_, frame_count, jsframe_count, zone());
WriteTranslation(environment, &translation);
int deoptimization_index = deoptimizations_.length();
int pc_offset = masm()->pc_offset();
environment->Register(deoptimization_index,
translation.index(),
(mode == Safepoint::kLazyDeopt) ? pc_offset : -1);
deoptimizations_.Add(environment, zone());
}
}
void LCodeGen::DeoptimizeIf(Condition condition, LInstruction* instr,
DeoptimizeReason deopt_reason,
Deoptimizer::BailoutType bailout_type,
Register src1, const Operand& src2) {
LEnvironment* environment = instr->environment();
RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
DCHECK(environment->HasBeenRegistered());
int id = environment->deoptimization_index();
Address entry =
Deoptimizer::GetDeoptimizationEntry(isolate(), id, bailout_type);
if (entry == NULL) {
Abort(kBailoutWasNotPrepared);
return;
}
if (FLAG_deopt_every_n_times != 0 && !info()->IsStub()) {
Register scratch = scratch0();
ExternalReference count = ExternalReference::stress_deopt_count(isolate());
Label no_deopt;
__ Push(a1, scratch);
__ li(scratch, Operand(count));
__ lw(a1, MemOperand(scratch));
__ Subu(a1, a1, Operand(1));
__ Branch(&no_deopt, ne, a1, Operand(zero_reg));
__ li(a1, Operand(FLAG_deopt_every_n_times));
__ sw(a1, MemOperand(scratch));
__ Pop(a1, scratch);
__ Call(entry, RelocInfo::RUNTIME_ENTRY);
__ bind(&no_deopt);
__ sw(a1, MemOperand(scratch));
__ Pop(a1, scratch);
}
if (info()->ShouldTrapOnDeopt()) {
Label skip;
if (condition != al) {
__ Branch(&skip, NegateCondition(condition), src1, src2);
}
__ stop("trap_on_deopt");
__ bind(&skip);
}
Deoptimizer::DeoptInfo deopt_info = MakeDeoptInfo(instr, deopt_reason, id);
DCHECK(info()->IsStub() || frame_is_built_);
// Go through jump table if we need to handle condition, build frame, or
// restore caller doubles.
if (condition == al && frame_is_built_ &&
!info()->saves_caller_doubles()) {
DeoptComment(deopt_info);
__ Call(entry, RelocInfo::RUNTIME_ENTRY, condition, src1, src2);
} else {
Deoptimizer::JumpTableEntry* table_entry =
new (zone()) Deoptimizer::JumpTableEntry(
entry, deopt_info, bailout_type, !frame_is_built_);
// We often have several deopts to the same entry, reuse the last
// jump entry if this is the case.
if (FLAG_trace_deopt || isolate()->is_profiling() ||
jump_table_.is_empty() ||
!table_entry->IsEquivalentTo(*jump_table_.last())) {
jump_table_.Add(table_entry, zone());
}
__ Branch(&jump_table_.last()->label, condition, src1, src2);
}
}
void LCodeGen::DeoptimizeIf(Condition condition, LInstruction* instr,
DeoptimizeReason deopt_reason, Register src1,
const Operand& src2) {
Deoptimizer::BailoutType bailout_type = info()->IsStub()
? Deoptimizer::LAZY
: Deoptimizer::EAGER;
DeoptimizeIf(condition, instr, deopt_reason, bailout_type, src1, src2);
}
void LCodeGen::RecordSafepointWithLazyDeopt(
LInstruction* instr, SafepointMode safepoint_mode) {
if (safepoint_mode == RECORD_SIMPLE_SAFEPOINT) {
RecordSafepoint(instr->pointer_map(), Safepoint::kLazyDeopt);
} else {
DCHECK(safepoint_mode == RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kLazyDeopt);
}
}
void LCodeGen::RecordSafepoint(
LPointerMap* pointers,
Safepoint::Kind kind,
int arguments,
Safepoint::DeoptMode deopt_mode) {
DCHECK(expected_safepoint_kind_ == kind);
const ZoneList<LOperand*>* operands = pointers->GetNormalizedOperands();
Safepoint safepoint = safepoints_.DefineSafepoint(masm(),
kind, arguments, deopt_mode);
for (int i = 0; i < operands->length(); i++) {
LOperand* pointer = operands->at(i);
if (pointer->IsStackSlot()) {
safepoint.DefinePointerSlot(pointer->index(), zone());
} else if (pointer->IsRegister() && (kind & Safepoint::kWithRegisters)) {
safepoint.DefinePointerRegister(ToRegister(pointer), zone());
}
}
}
void LCodeGen::RecordSafepoint(LPointerMap* pointers,
Safepoint::DeoptMode deopt_mode) {
RecordSafepoint(pointers, Safepoint::kSimple, 0, deopt_mode);
}
void LCodeGen::RecordSafepoint(Safepoint::DeoptMode deopt_mode) {
LPointerMap empty_pointers(zone());
RecordSafepoint(&empty_pointers, deopt_mode);
}
void LCodeGen::RecordSafepointWithRegisters(LPointerMap* pointers,
int arguments,
Safepoint::DeoptMode deopt_mode) {
RecordSafepoint(
pointers, Safepoint::kWithRegisters, arguments, deopt_mode);
}
static const char* LabelType(LLabel* label) {
if (label->is_loop_header()) return " (loop header)";
if (label->is_osr_entry()) return " (OSR entry)";
return "";
}
void LCodeGen::DoLabel(LLabel* label) {
Comment(";;; <@%d,#%d> -------------------- B%d%s --------------------",
current_instruction_,
label->hydrogen_value()->id(),
label->block_id(),
LabelType(label));
__ bind(label->label());
current_block_ = label->block_id();
DoGap(label);
}
void LCodeGen::DoParallelMove(LParallelMove* move) {
resolver_.Resolve(move);
}
void LCodeGen::DoGap(LGap* gap) {
for (int i = LGap::FIRST_INNER_POSITION;
i <= LGap::LAST_INNER_POSITION;
i++) {
LGap::InnerPosition inner_pos = static_cast<LGap::InnerPosition>(i);
LParallelMove* move = gap->GetParallelMove(inner_pos);
if (move != NULL) DoParallelMove(move);
}
}
void LCodeGen::DoInstructionGap(LInstructionGap* instr) {
DoGap(instr);
}
void LCodeGen::DoParameter(LParameter* instr) {
// Nothing to do.
}
void LCodeGen::DoUnknownOSRValue(LUnknownOSRValue* instr) {
GenerateOsrPrologue();
}
void LCodeGen::DoModByPowerOf2I(LModByPowerOf2I* instr) {
Register dividend = ToRegister(instr->dividend());
int32_t divisor = instr->divisor();
DCHECK(dividend.is(ToRegister(instr->result())));
// Theoretically, a variation of the branch-free code for integer division by
// a power of 2 (calculating the remainder via an additional multiplication
// (which gets simplified to an 'and') and subtraction) should be faster, and
// this is exactly what GCC and clang emit. Nevertheless, benchmarks seem to
// indicate that positive dividends are heavily favored, so the branching
// version performs better.
HMod* hmod = instr->hydrogen();
int32_t mask = divisor < 0 ? -(divisor + 1) : (divisor - 1);
Label dividend_is_not_negative, done;
if (hmod->CheckFlag(HValue::kLeftCanBeNegative)) {
__ Branch(÷nd_is_not_negative, ge, dividend, Operand(zero_reg));
// Note: The code below even works when right contains kMinInt.
__ dsubu(dividend, zero_reg, dividend);
__ And(dividend, dividend, Operand(mask));
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, dividend,
Operand(zero_reg));
}
__ Branch(USE_DELAY_SLOT, &done);
__ dsubu(dividend, zero_reg, dividend);
}
__ bind(÷nd_is_not_negative);
__ And(dividend, dividend, Operand(mask));
__ bind(&done);
}
void LCodeGen::DoModByConstI(LModByConstI* instr) {
Register dividend = ToRegister(instr->dividend());
int32_t divisor = instr->divisor();
Register result = ToRegister(instr->result());
DCHECK(!dividend.is(result));
if (divisor == 0) {
DeoptimizeIf(al, instr, DeoptimizeReason::kDivisionByZero);
return;
}
__ TruncatingDiv(result, dividend, Abs(divisor));
__ Dmul(result, result, Operand(Abs(divisor)));
__ Dsubu(result, dividend, Operand(result));
// Check for negative zero.
HMod* hmod = instr->hydrogen();
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label remainder_not_zero;
__ Branch(&remainder_not_zero, ne, result, Operand(zero_reg));
DeoptimizeIf(lt, instr, DeoptimizeReason::kMinusZero, dividend,
Operand(zero_reg));
__ bind(&remainder_not_zero);
}
}
void LCodeGen::DoModI(LModI* instr) {
HMod* hmod = instr->hydrogen();
const Register left_reg = ToRegister(instr->left());
const Register right_reg = ToRegister(instr->right());
const Register result_reg = ToRegister(instr->result());
// div runs in the background while we check for special cases.
__ Dmod(result_reg, left_reg, right_reg);
Label done;
// Check for x % 0, we have to deopt in this case because we can't return a
// NaN.
if (hmod->CheckFlag(HValue::kCanBeDivByZero)) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kDivisionByZero, right_reg,
Operand(zero_reg));
}
// Check for kMinInt % -1, div will return kMinInt, which is not what we
// want. We have to deopt if we care about -0, because we can't return that.
if (hmod->CheckFlag(HValue::kCanOverflow)) {
Label no_overflow_possible;
__ Branch(&no_overflow_possible, ne, left_reg, Operand(kMinInt));
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, right_reg,
Operand(-1));
} else {
__ Branch(&no_overflow_possible, ne, right_reg, Operand(-1));
__ Branch(USE_DELAY_SLOT, &done);
__ mov(result_reg, zero_reg);
}
__ bind(&no_overflow_possible);
}
// If we care about -0, test if the dividend is <0 and the result is 0.
__ Branch(&done, ge, left_reg, Operand(zero_reg));
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, result_reg,
Operand(zero_reg));
}
__ bind(&done);
}
void LCodeGen::DoDivByPowerOf2I(LDivByPowerOf2I* instr) {
Register dividend = ToRegister(instr->dividend());
int32_t divisor = instr->divisor();
Register result = ToRegister(instr->result());
DCHECK(divisor == kMinInt || base::bits::IsPowerOfTwo32(Abs(divisor)));
DCHECK(!result.is(dividend));
// Check for (0 / -x) that will produce negative zero.
HDiv* hdiv = instr->hydrogen();
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, dividend,
Operand(zero_reg));
}
// Check for (kMinInt / -1).
if (hdiv->CheckFlag(HValue::kCanOverflow) && divisor == -1) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kOverflow, dividend,
Operand(kMinInt));
}
// Deoptimize if remainder will not be 0.
if (!hdiv->CheckFlag(HInstruction::kAllUsesTruncatingToInt32) &&
divisor != 1 && divisor != -1) {
int32_t mask = divisor < 0 ? -(divisor + 1) : (divisor - 1);
__ And(at, dividend, Operand(mask));
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecision, at,
Operand(zero_reg));
}
if (divisor == -1) { // Nice shortcut, not needed for correctness.
__ Dsubu(result, zero_reg, dividend);
return;
}
uint16_t shift = WhichPowerOf2Abs(divisor);
if (shift == 0) {
__ Move(result, dividend);
} else if (shift == 1) {
__ dsrl32(result, dividend, 31);
__ Daddu(result, dividend, Operand(result));
} else {
__ dsra32(result, dividend, 31);
__ dsrl32(result, result, 32 - shift);
__ Daddu(result, dividend, Operand(result));
}
if (shift > 0) __ dsra(result, result, shift);
if (divisor < 0) __ Dsubu(result, zero_reg, result);
}
void LCodeGen::DoDivByConstI(LDivByConstI* instr) {
Register dividend = ToRegister(instr->dividend());
int32_t divisor = instr->divisor();
Register result = ToRegister(instr->result());
DCHECK(!dividend.is(result));
if (divisor == 0) {
DeoptimizeIf(al, instr, DeoptimizeReason::kDivisionByZero);
return;
}
// Check for (0 / -x) that will produce negative zero.
HDiv* hdiv = instr->hydrogen();
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, dividend,
Operand(zero_reg));
}
__ TruncatingDiv(result, dividend, Abs(divisor));
if (divisor < 0) __ Subu(result, zero_reg, result);
if (!hdiv->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)) {
__ Dmul(scratch0(), result, Operand(divisor));
__ Dsubu(scratch0(), scratch0(), dividend);
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecision, scratch0(),
Operand(zero_reg));
}
}
// TODO(svenpanne) Refactor this to avoid code duplication with DoFlooringDivI.
void LCodeGen::DoDivI(LDivI* instr) {
HBinaryOperation* hdiv = instr->hydrogen();
Register dividend = ToRegister(instr->dividend());
Register divisor = ToRegister(instr->divisor());
const Register result = ToRegister(instr->result());
// On MIPS div is asynchronous - it will run in the background while we
// check for special cases.
__ Div(result, dividend, divisor);
// Check for x / 0.
if (hdiv->CheckFlag(HValue::kCanBeDivByZero)) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kDivisionByZero, divisor,
Operand(zero_reg));
}
// Check for (0 / -x) that will produce negative zero.
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label left_not_zero;
__ Branch(&left_not_zero, ne, dividend, Operand(zero_reg));
DeoptimizeIf(lt, instr, DeoptimizeReason::kMinusZero, divisor,
Operand(zero_reg));
__ bind(&left_not_zero);
}
// Check for (kMinInt / -1).
if (hdiv->CheckFlag(HValue::kCanOverflow) &&
!hdiv->CheckFlag(HValue::kAllUsesTruncatingToInt32)) {
Label left_not_min_int;
__ Branch(&left_not_min_int, ne, dividend, Operand(kMinInt));
DeoptimizeIf(eq, instr, DeoptimizeReason::kOverflow, divisor, Operand(-1));
__ bind(&left_not_min_int);
}
if (!hdiv->CheckFlag(HValue::kAllUsesTruncatingToInt32)) {
// Calculate remainder.
Register remainder = ToRegister(instr->temp());
if (kArchVariant != kMips64r6) {
__ mfhi(remainder);
} else {
__ dmod(remainder, dividend, divisor);
}
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecision, remainder,
Operand(zero_reg));
}
}
void LCodeGen::DoMultiplyAddD(LMultiplyAddD* instr) {
DoubleRegister addend = ToDoubleRegister(instr->addend());
DoubleRegister multiplier = ToDoubleRegister(instr->multiplier());
DoubleRegister multiplicand = ToDoubleRegister(instr->multiplicand());
// This is computed in-place.
DCHECK(addend.is(ToDoubleRegister(instr->result())));
__ Madd_d(addend, addend, multiplier, multiplicand, double_scratch0());
}
void LCodeGen::DoFlooringDivByPowerOf2I(LFlooringDivByPowerOf2I* instr) {
Register dividend = ToRegister(instr->dividend());
Register result = ToRegister(instr->result());
int32_t divisor = instr->divisor();
Register scratch = result.is(dividend) ? scratch0() : dividend;
DCHECK(!result.is(dividend) || !scratch.is(dividend));
// If the divisor is 1, return the dividend.
if (divisor == 0) {
__ Move(result, dividend);
return;
}
// If the divisor is positive, things are easy: There can be no deopts and we
// can simply do an arithmetic right shift.
uint16_t shift = WhichPowerOf2Abs(divisor);
if (divisor > 1) {
__ dsra(result, dividend, shift);
return;
}
// If the divisor is negative, we have to negate and handle edge cases.
// Dividend can be the same register as result so save the value of it
// for checking overflow.
__ Move(scratch, dividend);
__ Dsubu(result, zero_reg, dividend);
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, result,
Operand(zero_reg));
}
__ Xor(scratch, scratch, result);
// Dividing by -1 is basically negation, unless we overflow.
if (divisor == -1) {
if (instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
DeoptimizeIf(gt, instr, DeoptimizeReason::kOverflow, result,
Operand(kMaxInt));
}
return;
}
// If the negation could not overflow, simply shifting is OK.
if (!instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
__ dsra(result, result, shift);
return;
}
Label no_overflow, done;
__ Branch(&no_overflow, lt, scratch, Operand(zero_reg));
__ li(result, Operand(kMinInt / divisor), CONSTANT_SIZE);
__ Branch(&done);
__ bind(&no_overflow);
__ dsra(result, result, shift);
__ bind(&done);
}
void LCodeGen::DoFlooringDivByConstI(LFlooringDivByConstI* instr) {
Register dividend = ToRegister(instr->dividend());
int32_t divisor = instr->divisor();
Register result = ToRegister(instr->result());
DCHECK(!dividend.is(result));
if (divisor == 0) {
DeoptimizeIf(al, instr, DeoptimizeReason::kDivisionByZero);
return;
}
// Check for (0 / -x) that will produce negative zero.
HMathFloorOfDiv* hdiv = instr->hydrogen();
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, dividend,
Operand(zero_reg));
}
// Easy case: We need no dynamic check for the dividend and the flooring
// division is the same as the truncating division.
if ((divisor > 0 && !hdiv->CheckFlag(HValue::kLeftCanBeNegative)) ||
(divisor < 0 && !hdiv->CheckFlag(HValue::kLeftCanBePositive))) {
__ TruncatingDiv(result, dividend, Abs(divisor));
if (divisor < 0) __ Dsubu(result, zero_reg, result);
return;
}
// In the general case we may need to adjust before and after the truncating
// division to get a flooring division.
Register temp = ToRegister(instr->temp());
DCHECK(!temp.is(dividend) && !temp.is(result));
Label needs_adjustment, done;
__ Branch(&needs_adjustment, divisor > 0 ? lt : gt,
dividend, Operand(zero_reg));
__ TruncatingDiv(result, dividend, Abs(divisor));
if (divisor < 0) __ Dsubu(result, zero_reg, result);
__ jmp(&done);
__ bind(&needs_adjustment);
__ Daddu(temp, dividend, Operand(divisor > 0 ? 1 : -1));
__ TruncatingDiv(result, temp, Abs(divisor));
if (divisor < 0) __ Dsubu(result, zero_reg, result);
__ Dsubu(result, result, Operand(1));
__ bind(&done);
}
// TODO(svenpanne) Refactor this to avoid code duplication with DoDivI.
void LCodeGen::DoFlooringDivI(LFlooringDivI* instr) {
HBinaryOperation* hdiv = instr->hydrogen();
Register dividend = ToRegister(instr->dividend());
Register divisor = ToRegister(instr->divisor());
const Register result = ToRegister(instr->result());
// On MIPS div is asynchronous - it will run in the background while we
// check for special cases.
__ Ddiv(result, dividend, divisor);
// Check for x / 0.
if (hdiv->CheckFlag(HValue::kCanBeDivByZero)) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kDivisionByZero, divisor,
Operand(zero_reg));
}
// Check for (0 / -x) that will produce negative zero.
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label left_not_zero;
__ Branch(&left_not_zero, ne, dividend, Operand(zero_reg));
DeoptimizeIf(lt, instr, DeoptimizeReason::kMinusZero, divisor,
Operand(zero_reg));
__ bind(&left_not_zero);
}
// Check for (kMinInt / -1).
if (hdiv->CheckFlag(HValue::kCanOverflow) &&
!hdiv->CheckFlag(HValue::kAllUsesTruncatingToInt32)) {
Label left_not_min_int;
__ Branch(&left_not_min_int, ne, dividend, Operand(kMinInt));
DeoptimizeIf(eq, instr, DeoptimizeReason::kOverflow, divisor, Operand(-1));
__ bind(&left_not_min_int);
}
// We performed a truncating division. Correct the result if necessary.
Label done;
Register remainder = scratch0();
if (kArchVariant != kMips64r6) {
__ mfhi(remainder);
} else {
__ dmod(remainder, dividend, divisor);
}
__ Branch(&done, eq, remainder, Operand(zero_reg), USE_DELAY_SLOT);
__ Xor(remainder, remainder, Operand(divisor));
__ Branch(&done, ge, remainder, Operand(zero_reg));
__ Dsubu(result, result, Operand(1));
__ bind(&done);
}
void LCodeGen::DoMulS(LMulS* instr) {
Register scratch = scratch0();
Register result = ToRegister(instr->result());
// Note that result may alias left.
Register left = ToRegister(instr->left());
LOperand* right_op = instr->right();
bool bailout_on_minus_zero =
instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero);
bool overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
if (right_op->IsConstantOperand()) {
int32_t constant = ToInteger32(LConstantOperand::cast(right_op));
if (bailout_on_minus_zero && (constant < 0)) {
// The case of a null constant will be handled separately.
// If constant is negative and left is null, the result should be -0.
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, left,
Operand(zero_reg));
}
switch (constant) {
case -1:
if (overflow) {
Label no_overflow;
__ DsubBranchNoOvf(result, zero_reg, Operand(left), &no_overflow);
DeoptimizeIf(al, instr);
__ bind(&no_overflow);
} else {
__ Dsubu(result, zero_reg, left);
}
break;
case 0:
if (bailout_on_minus_zero) {
// If left is strictly negative and the constant is null, the
// result is -0. Deoptimize if required, otherwise return 0.
DeoptimizeIf(lt, instr, DeoptimizeReason::kMinusZero, left,
Operand(zero_reg));
}
__ mov(result, zero_reg);
break;
case 1:
// Nothing to do.
__ Move(result, left);
break;
default:
// Multiplying by powers of two and powers of two plus or minus
// one can be done faster with shifted operands.
// For other constants we emit standard code.
int32_t mask = constant >> 31;
uint32_t constant_abs = (constant + mask) ^ mask;
if (base::bits::IsPowerOfTwo32(constant_abs)) {
int32_t shift = WhichPowerOf2(constant_abs);
__ dsll(result, left, shift);
// Correct the sign of the result if the constant is negative.
if (constant < 0) __ Dsubu(result, zero_reg, result);
} else if (base::bits::IsPowerOfTwo32(constant_abs - 1)) {
int32_t shift = WhichPowerOf2(constant_abs - 1);
__ Dlsa(result, left, left, shift);
// Correct the sign of the result if the constant is negative.
if (constant < 0) __ Dsubu(result, zero_reg, result);
} else if (base::bits::IsPowerOfTwo32(constant_abs + 1)) {
int32_t shift = WhichPowerOf2(constant_abs + 1);
__ dsll(scratch, left, shift);
__ Dsubu(result, scratch, left);
// Correct the sign of the result if the constant is negative.
if (constant < 0) __ Dsubu(result, zero_reg, result);
} else {
// Generate standard code.
__ li(at, constant);
__ Dmul(result, left, at);
}
}
} else {
DCHECK(right_op->IsRegister());
Register right = ToRegister(right_op);
if (overflow) {
// hi:lo = left * right.
__ Dmulh(result, left, right);
__ dsra32(scratch, result, 0);
__ sra(at, result, 31);
__ SmiTag(result);
DeoptimizeIf(ne, instr, DeoptimizeReason::kOverflow, scratch,
Operand(at));
} else {
__ SmiUntag(result, left);
__ dmul(result, result, right);
}
if (bailout_on_minus_zero) {
Label done;
__ Xor(at, left, right);
__ Branch(&done, ge, at, Operand(zero_reg));
// Bail out if the result is minus zero.
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, result,
Operand(zero_reg));
__ bind(&done);
}
}
}
void LCodeGen::DoMulI(LMulI* instr) {
Register scratch = scratch0();
Register result = ToRegister(instr->result());
// Note that result may alias left.
Register left = ToRegister(instr->left());
LOperand* right_op = instr->right();
bool bailout_on_minus_zero =
instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero);
bool overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
if (right_op->IsConstantOperand()) {
int32_t constant = ToInteger32(LConstantOperand::cast(right_op));
if (bailout_on_minus_zero && (constant < 0)) {
// The case of a null constant will be handled separately.
// If constant is negative and left is null, the result should be -0.
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, left,
Operand(zero_reg));
}
switch (constant) {
case -1:
if (overflow) {
Label no_overflow;
__ SubBranchNoOvf(result, zero_reg, Operand(left), &no_overflow);
DeoptimizeIf(al, instr);
__ bind(&no_overflow);
} else {
__ Subu(result, zero_reg, left);
}
break;
case 0:
if (bailout_on_minus_zero) {
// If left is strictly negative and the constant is null, the
// result is -0. Deoptimize if required, otherwise return 0.
DeoptimizeIf(lt, instr, DeoptimizeReason::kMinusZero, left,
Operand(zero_reg));
}
__ mov(result, zero_reg);
break;
case 1:
// Nothing to do.
__ Move(result, left);
break;
default:
// Multiplying by powers of two and powers of two plus or minus
// one can be done faster with shifted operands.
// For other constants we emit standard code.
int32_t mask = constant >> 31;
uint32_t constant_abs = (constant + mask) ^ mask;
if (base::bits::IsPowerOfTwo32(constant_abs)) {
int32_t shift = WhichPowerOf2(constant_abs);
__ sll(result, left, shift);
// Correct the sign of the result if the constant is negative.
if (constant < 0) __ Subu(result, zero_reg, result);
} else if (base::bits::IsPowerOfTwo32(constant_abs - 1)) {
int32_t shift = WhichPowerOf2(constant_abs - 1);
__ Lsa(result, left, left, shift);
// Correct the sign of the result if the constant is negative.
if (constant < 0) __ Subu(result, zero_reg, result);
} else if (base::bits::IsPowerOfTwo32(constant_abs + 1)) {
int32_t shift = WhichPowerOf2(constant_abs + 1);
__ sll(scratch, left, shift);
__ Subu(result, scratch, left);
// Correct the sign of the result if the constant is negative.
if (constant < 0) __ Subu(result, zero_reg, result);
} else {
// Generate standard code.
__ li(at, constant);
__ Mul(result, left, at);
}
}
} else {
DCHECK(right_op->IsRegister());
Register right = ToRegister(right_op);
if (overflow) {
// hi:lo = left * right.
__ Dmul(result, left, right);
__ dsra32(scratch, result, 0);
__ sra(at, result, 31);
DeoptimizeIf(ne, instr, DeoptimizeReason::kOverflow, scratch,
Operand(at));
} else {
__ mul(result, left, right);
}
if (bailout_on_minus_zero) {
Label done;
__ Xor(at, left, right);
__ Branch(&done, ge, at, Operand(zero_reg));
// Bail out if the result is minus zero.
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, result,
Operand(zero_reg));
__ bind(&done);
}
}
}
void LCodeGen::DoBitI(LBitI* instr) {
LOperand* left_op = instr->left();
LOperand* right_op = instr->right();
DCHECK(left_op->IsRegister());
Register left = ToRegister(left_op);
Register result = ToRegister(instr->result());
Operand right(no_reg);
if (right_op->IsStackSlot()) {
right = Operand(EmitLoadRegister(right_op, at));
} else {
DCHECK(right_op->IsRegister() || right_op->IsConstantOperand());
right = ToOperand(right_op);
}
switch (instr->op()) {
case Token::BIT_AND:
__ And(result, left, right);
break;
case Token::BIT_OR:
__ Or(result, left, right);
break;
case Token::BIT_XOR:
if (right_op->IsConstantOperand() && right.immediate() == int32_t(~0)) {
__ Nor(result, zero_reg, left);
} else {
__ Xor(result, left, right);
}
break;
default:
UNREACHABLE();
break;
}
}
void LCodeGen::DoShiftI(LShiftI* instr) {
// Both 'left' and 'right' are "used at start" (see LCodeGen::DoShift), so
// result may alias either of them.
LOperand* right_op = instr->right();
Register left = ToRegister(instr->left());
Register result = ToRegister(instr->result());
if (right_op->IsRegister()) {
// No need to mask the right operand on MIPS, it is built into the variable
// shift instructions.
switch (instr->op()) {
case Token::ROR:
__ Ror(result, left, Operand(ToRegister(right_op)));
break;
case Token::SAR:
__ srav(result, left, ToRegister(right_op));
break;
case Token::SHR:
__ srlv(result, left, ToRegister(right_op));
if (instr->can_deopt()) {
// TODO(yy): (-1) >>> 0. anything else?
DeoptimizeIf(lt, instr, DeoptimizeReason::kNegativeValue, result,
Operand(zero_reg));
DeoptimizeIf(gt, instr, DeoptimizeReason::kNegativeValue, result,
Operand(kMaxInt));
}
break;
case Token::SHL:
__ sllv(result, left, ToRegister(right_op));
break;
default:
UNREACHABLE();
break;
}
} else {
// Mask the right_op operand.
int value = ToInteger32(LConstantOperand::cast(right_op));
uint8_t shift_count = static_cast<uint8_t>(value & 0x1F);
switch (instr->op()) {
case Token::ROR:
if (shift_count != 0) {
__ Ror(result, left, Operand(shift_count));
} else {
__ Move(result, left);
}
break;
case Token::SAR:
if (shift_count != 0) {
__ sra(result, left, shift_count);
} else {
__ Move(result, left);
}
break;
case Token::SHR:
if (shift_count != 0) {
__ srl(result, left, shift_count);
} else {
if (instr->can_deopt()) {
__ And(at, left, Operand(0x80000000));
DeoptimizeIf(ne, instr, DeoptimizeReason::kNegativeValue, at,
Operand(zero_reg));
}
__ Move(result, left);
}
break;
case Token::SHL:
if (shift_count != 0) {
if (instr->hydrogen_value()->representation().IsSmi()) {
__ dsll(result, left, shift_count);
} else {
__ sll(result, left, shift_count);
}
} else {
__ Move(result, left);
}
break;
default:
UNREACHABLE();
break;
}
}
}
void LCodeGen::DoSubS(LSubS* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
LOperand* result = instr->result();
bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
if (!can_overflow) {
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ Dsubu(ToRegister(result), ToRegister(left), ToOperand(right));
} else { // can_overflow.
Register scratch = scratch0();
Label no_overflow_label;
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ DsubBranchNoOvf(ToRegister(result), ToRegister(left), ToOperand(right),
&no_overflow_label, scratch);
DeoptimizeIf(al, instr);
__ bind(&no_overflow_label);
}
}
void LCodeGen::DoSubI(LSubI* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
LOperand* result = instr->result();
bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
if (!can_overflow) {
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ Subu(ToRegister(result), ToRegister(left), ToOperand(right));
} else { // can_overflow.
Register scratch = scratch0();
Label no_overflow_label;
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ SubBranchNoOvf(ToRegister(result), ToRegister(left), ToOperand(right),
&no_overflow_label, scratch);
DeoptimizeIf(al, instr);
__ bind(&no_overflow_label);
}
}
void LCodeGen::DoConstantI(LConstantI* instr) {
__ li(ToRegister(instr->result()), Operand(instr->value()));
}
void LCodeGen::DoConstantS(LConstantS* instr) {
__ li(ToRegister(instr->result()), Operand(instr->value()));
}
void LCodeGen::DoConstantD(LConstantD* instr) {
DCHECK(instr->result()->IsDoubleRegister());
DoubleRegister result = ToDoubleRegister(instr->result());
double v = instr->value();
__ Move(result, v);
}
void LCodeGen::DoConstantE(LConstantE* instr) {
__ li(ToRegister(instr->result()), Operand(instr->value()));
}
void LCodeGen::DoConstantT(LConstantT* instr) {
Handle<Object> object = instr->value(isolate());
AllowDeferredHandleDereference smi_check;
__ li(ToRegister(instr->result()), object);
}
MemOperand LCodeGen::BuildSeqStringOperand(Register string,
LOperand* index,
String::Encoding encoding) {
if (index->IsConstantOperand()) {
int offset = ToInteger32(LConstantOperand::cast(index));
if (encoding == String::TWO_BYTE_ENCODING) {
offset *= kUC16Size;
}
STATIC_ASSERT(kCharSize == 1);
return FieldMemOperand(string, SeqString::kHeaderSize + offset);
}
Register scratch = scratch0();
DCHECK(!scratch.is(string));
DCHECK(!scratch.is(ToRegister(index)));
if (encoding == String::ONE_BYTE_ENCODING) {
__ Daddu(scratch, string, ToRegister(index));
} else {
STATIC_ASSERT(kUC16Size == 2);
__ dsll(scratch, ToRegister(index), 1);
__ Daddu(scratch, string, scratch);
}
return FieldMemOperand(scratch, SeqString::kHeaderSize);
}
void LCodeGen::DoSeqStringGetChar(LSeqStringGetChar* instr) {
String::Encoding encoding = instr->hydrogen()->encoding();
Register string = ToRegister(instr->string());
Register result = ToRegister(instr->result());
if (FLAG_debug_code) {
Register scratch = scratch0();
__ ld(scratch, FieldMemOperand(string, HeapObject::kMapOffset));
__ lbu(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
__ And(scratch, scratch,
Operand(kStringRepresentationMask | kStringEncodingMask));
static const uint32_t one_byte_seq_type = kSeqStringTag | kOneByteStringTag;
static const uint32_t two_byte_seq_type = kSeqStringTag | kTwoByteStringTag;
__ Dsubu(at, scratch, Operand(encoding == String::ONE_BYTE_ENCODING
? one_byte_seq_type : two_byte_seq_type));
__ Check(eq, kUnexpectedStringType, at, Operand(zero_reg));
}
MemOperand operand = BuildSeqStringOperand(string, instr->index(), encoding);
if (encoding == String::ONE_BYTE_ENCODING) {
__ lbu(result, operand);
} else {
__ lhu(result, operand);
}
}
void LCodeGen::DoSeqStringSetChar(LSeqStringSetChar* instr) {
String::Encoding encoding = instr->hydrogen()->encoding();
Register string = ToRegister(instr->string());
Register value = ToRegister(instr->value());
if (FLAG_debug_code) {
Register scratch = scratch0();
Register index = ToRegister(instr->index());
static const uint32_t one_byte_seq_type = kSeqStringTag | kOneByteStringTag;
static const uint32_t two_byte_seq_type = kSeqStringTag | kTwoByteStringTag;
int encoding_mask =
instr->hydrogen()->encoding() == String::ONE_BYTE_ENCODING
? one_byte_seq_type : two_byte_seq_type;
__ EmitSeqStringSetCharCheck(string, index, value, scratch, encoding_mask);
}
MemOperand operand = BuildSeqStringOperand(string, instr->index(), encoding);
if (encoding == String::ONE_BYTE_ENCODING) {
__ sb(value, operand);
} else {
__ sh(value, operand);
}
}
void LCodeGen::DoAddE(LAddE* instr) {
LOperand* result = instr->result();
LOperand* left = instr->left();
LOperand* right = instr->right();
DCHECK(!instr->hydrogen()->CheckFlag(HValue::kCanOverflow));
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ Daddu(ToRegister(result), ToRegister(left), ToOperand(right));
}
void LCodeGen::DoAddS(LAddS* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
LOperand* result = instr->result();
bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
if (!can_overflow) {
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ Daddu(ToRegister(result), ToRegister(left), ToOperand(right));
} else { // can_overflow.
Label no_overflow_label;
Register scratch = scratch1();
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ DaddBranchNoOvf(ToRegister(result), ToRegister(left), ToOperand(right),
&no_overflow_label, scratch);
DeoptimizeIf(al, instr);
__ bind(&no_overflow_label);
}
}
void LCodeGen::DoAddI(LAddI* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
LOperand* result = instr->result();
bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
if (!can_overflow) {
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ Addu(ToRegister(result), ToRegister(left), ToOperand(right));
} else { // can_overflow.
Label no_overflow_label;
Register scratch = scratch1();
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ AddBranchNoOvf(ToRegister(result), ToRegister(left), ToOperand(right),
&no_overflow_label, scratch);
DeoptimizeIf(al, instr);
__ bind(&no_overflow_label);
}
}
void LCodeGen::DoMathMinMax(LMathMinMax* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
HMathMinMax::Operation operation = instr->hydrogen()->operation();
Register scratch = scratch1();
if (instr->hydrogen()->representation().IsSmiOrInteger32()) {
Condition condition = (operation == HMathMinMax::kMathMin) ? le : ge;
Register left_reg = ToRegister(left);
Register right_reg = EmitLoadRegister(right, scratch0());
Register result_reg = ToRegister(instr->result());
Label return_right, done;
__ Slt(scratch, left_reg, Operand(right_reg));
if (condition == ge) {
__ Movz(result_reg, left_reg, scratch);
__ Movn(result_reg, right_reg, scratch);
} else {
DCHECK(condition == le);
__ Movn(result_reg, left_reg, scratch);
__ Movz(result_reg, right_reg, scratch);
}
} else {
DCHECK(instr->hydrogen()->representation().IsDouble());
FPURegister left_reg = ToDoubleRegister(left);
FPURegister right_reg = ToDoubleRegister(right);
FPURegister result_reg = ToDoubleRegister(instr->result());
Label nan, done;
if (operation == HMathMinMax::kMathMax) {
__ Float64Max(result_reg, left_reg, right_reg, &nan);
} else {
DCHECK(operation == HMathMinMax::kMathMin);
__ Float64Min(result_reg, left_reg, right_reg, &nan);
}
__ Branch(&done);
__ bind(&nan);
__ add_d(result_reg, left_reg, right_reg);
__ bind(&done);
}
}
void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
DoubleRegister left = ToDoubleRegister(instr->left());
DoubleRegister right = ToDoubleRegister(instr->right());
DoubleRegister result = ToDoubleRegister(instr->result());
switch (instr->op()) {
case Token::ADD:
__ add_d(result, left, right);
break;
case Token::SUB:
__ sub_d(result, left, right);
break;
case Token::MUL:
__ mul_d(result, left, right);
break;
case Token::DIV:
__ div_d(result, left, right);
break;
case Token::MOD: {
// Save a0-a3 on the stack.
RegList saved_regs = a0.bit() | a1.bit() | a2.bit() | a3.bit();
__ MultiPush(saved_regs);
__ PrepareCallCFunction(0, 2, scratch0());
__ MovToFloatParameters(left, right);
__ CallCFunction(
ExternalReference::mod_two_doubles_operation(isolate()),
0, 2);
// Move the result in the double result register.
__ MovFromFloatResult(result);
// Restore saved register.
__ MultiPop(saved_regs);
break;
}
default:
UNREACHABLE();
break;
}
}
void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->left()).is(a1));
DCHECK(ToRegister(instr->right()).is(a0));
DCHECK(ToRegister(instr->result()).is(v0));
Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), instr->op()).code();
CallCode(code, RelocInfo::CODE_TARGET, instr);
// Other arch use a nop here, to signal that there is no inlined
// patchable code. Mips does not need the nop, since our marker
// instruction (andi zero_reg) will never be used in normal code.
}
template<class InstrType>
void LCodeGen::EmitBranch(InstrType instr,
Condition condition,
Register src1,
const Operand& src2) {
int left_block = instr->TrueDestination(chunk_);
int right_block = instr->FalseDestination(chunk_);
int next_block = GetNextEmittedBlock();
if (right_block == left_block || condition == al) {
EmitGoto(left_block);
} else if (left_block == next_block) {
__ Branch(chunk_->GetAssemblyLabel(right_block),
NegateCondition(condition), src1, src2);
} else if (right_block == next_block) {
__ Branch(chunk_->GetAssemblyLabel(left_block), condition, src1, src2);
} else {
__ Branch(chunk_->GetAssemblyLabel(left_block), condition, src1, src2);
__ Branch(chunk_->GetAssemblyLabel(right_block));
}
}
template<class InstrType>
void LCodeGen::EmitBranchF(InstrType instr,
Condition condition,
FPURegister src1,
FPURegister src2) {
int right_block = instr->FalseDestination(chunk_);
int left_block = instr->TrueDestination(chunk_);
int next_block = GetNextEmittedBlock();
if (right_block == left_block) {
EmitGoto(left_block);
} else if (left_block == next_block) {
__ BranchF(chunk_->GetAssemblyLabel(right_block), NULL,
NegateFpuCondition(condition), src1, src2);
} else if (right_block == next_block) {
__ BranchF(chunk_->GetAssemblyLabel(left_block), NULL,
condition, src1, src2);
} else {
__ BranchF(chunk_->GetAssemblyLabel(left_block), NULL,
condition, src1, src2);
__ Branch(chunk_->GetAssemblyLabel(right_block));
}
}
template <class InstrType>
void LCodeGen::EmitTrueBranch(InstrType instr, Condition condition,
Register src1, const Operand& src2) {
int true_block = instr->TrueDestination(chunk_);
__ Branch(chunk_->GetAssemblyLabel(true_block), condition, src1, src2);
}
template <class InstrType>
void LCodeGen::EmitFalseBranch(InstrType instr, Condition condition,
Register src1, const Operand& src2) {
int false_block = instr->FalseDestination(chunk_);
__ Branch(chunk_->GetAssemblyLabel(false_block), condition, src1, src2);
}
template<class InstrType>
void LCodeGen::EmitFalseBranchF(InstrType instr,
Condition condition,
FPURegister src1,
FPURegister src2) {
int false_block = instr->FalseDestination(chunk_);
__ BranchF(chunk_->GetAssemblyLabel(false_block), NULL,
condition, src1, src2);
}
void LCodeGen::DoDebugBreak(LDebugBreak* instr) {
__ stop("LDebugBreak");
}
void LCodeGen::DoBranch(LBranch* instr) {
Representation r = instr->hydrogen()->value()->representation();
if (r.IsInteger32() || r.IsSmi()) {
DCHECK(!info()->IsStub());
Register reg = ToRegister(instr->value());
EmitBranch(instr, ne, reg, Operand(zero_reg));
} else if (r.IsDouble()) {
DCHECK(!info()->IsStub());
DoubleRegister reg = ToDoubleRegister(instr->value());
// Test the double value. Zero and NaN are false.
EmitBranchF(instr, ogl, reg, kDoubleRegZero);
} else {
DCHECK(r.IsTagged());
Register reg = ToRegister(instr->value());
HType type = instr->hydrogen()->value()->type();
if (type.IsBoolean()) {
DCHECK(!info()->IsStub());
__ LoadRoot(at, Heap::kTrueValueRootIndex);
EmitBranch(instr, eq, reg, Operand(at));
} else if (type.IsSmi()) {
DCHECK(!info()->IsStub());
EmitBranch(instr, ne, reg, Operand(zero_reg));
} else if (type.IsJSArray()) {
DCHECK(!info()->IsStub());
EmitBranch(instr, al, zero_reg, Operand(zero_reg));
} else if (type.IsHeapNumber()) {
DCHECK(!info()->IsStub());
DoubleRegister dbl_scratch = double_scratch0();
__ ldc1(dbl_scratch, FieldMemOperand(reg, HeapNumber::kValueOffset));
// Test the double value. Zero and NaN are false.
EmitBranchF(instr, ogl, dbl_scratch, kDoubleRegZero);
} else if (type.IsString()) {
DCHECK(!info()->IsStub());
__ ld(at, FieldMemOperand(reg, String::kLengthOffset));
EmitBranch(instr, ne, at, Operand(zero_reg));
} else {
ToBooleanHints expected = instr->hydrogen()->expected_input_types();
// Avoid deopts in the case where we've never executed this path before.
if (expected == ToBooleanHint::kNone) expected = ToBooleanHint::kAny;
if (expected & ToBooleanHint::kUndefined) {
// undefined -> false.
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
__ Branch(instr->FalseLabel(chunk_), eq, reg, Operand(at));
}
if (expected & ToBooleanHint::kBoolean) {
// Boolean -> its value.
__ LoadRoot(at, Heap::kTrueValueRootIndex);
__ Branch(instr->TrueLabel(chunk_), eq, reg, Operand(at));
__ LoadRoot(at, Heap::kFalseValueRootIndex);
__ Branch(instr->FalseLabel(chunk_), eq, reg, Operand(at));
}
if (expected & ToBooleanHint::kNull) {
// 'null' -> false.
__ LoadRoot(at, Heap::kNullValueRootIndex);
__ Branch(instr->FalseLabel(chunk_), eq, reg, Operand(at));
}
if (expected & ToBooleanHint::kSmallInteger) {
// Smis: 0 -> false, all other -> true.
__ Branch(instr->FalseLabel(chunk_), eq, reg, Operand(zero_reg));
__ JumpIfSmi(reg, instr->TrueLabel(chunk_));
} else if (expected & ToBooleanHint::kNeedsMap) {
// If we need a map later and have a Smi -> deopt.
__ SmiTst(reg, at);
DeoptimizeIf(eq, instr, DeoptimizeReason::kSmi, at, Operand(zero_reg));
}
const Register map = scratch0();
if (expected & ToBooleanHint::kNeedsMap) {
__ ld(map, FieldMemOperand(reg, HeapObject::kMapOffset));
if (expected & ToBooleanHint::kCanBeUndetectable) {
// Undetectable -> false.
__ lbu(at, FieldMemOperand(map, Map::kBitFieldOffset));
__ And(at, at, Operand(1 << Map::kIsUndetectable));
__ Branch(instr->FalseLabel(chunk_), ne, at, Operand(zero_reg));
}
}
if (expected & ToBooleanHint::kReceiver) {
// spec object -> true.
__ lbu(at, FieldMemOperand(map, Map::kInstanceTypeOffset));
__ Branch(instr->TrueLabel(chunk_),
ge, at, Operand(FIRST_JS_RECEIVER_TYPE));
}
if (expected & ToBooleanHint::kString) {
// String value -> false iff empty.
Label not_string;
__ lbu(at, FieldMemOperand(map, Map::kInstanceTypeOffset));
__ Branch(¬_string, ge , at, Operand(FIRST_NONSTRING_TYPE));
__ ld(at, FieldMemOperand(reg, String::kLengthOffset));
__ Branch(instr->TrueLabel(chunk_), ne, at, Operand(zero_reg));
__ Branch(instr->FalseLabel(chunk_));
__ bind(¬_string);
}
if (expected & ToBooleanHint::kSymbol) {
// Symbol value -> true.
const Register scratch = scratch1();
__ lbu(scratch, FieldMemOperand(map, Map::kInstanceTypeOffset));
__ Branch(instr->TrueLabel(chunk_), eq, scratch, Operand(SYMBOL_TYPE));
}
if (expected & ToBooleanHint::kHeapNumber) {
// heap number -> false iff +0, -0, or NaN.
DoubleRegister dbl_scratch = double_scratch0();
Label not_heap_number;
__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
__ Branch(¬_heap_number, ne, map, Operand(at));
__ ldc1(dbl_scratch, FieldMemOperand(reg, HeapNumber::kValueOffset));
__ BranchF(instr->TrueLabel(chunk_), instr->FalseLabel(chunk_),
ne, dbl_scratch, kDoubleRegZero);
// Falls through if dbl_scratch == 0.
__ Branch(instr->FalseLabel(chunk_));
__ bind(¬_heap_number);
}
if (expected != ToBooleanHint::kAny) {
// We've seen something for the first time -> deopt.
// This can only happen if we are not generic already.
DeoptimizeIf(al, instr, DeoptimizeReason::kUnexpectedObject, zero_reg,
Operand(zero_reg));
}
}
}
}
void LCodeGen::EmitGoto(int block) {
if (!IsNextEmittedBlock(block)) {
__ jmp(chunk_->GetAssemblyLabel(LookupDestination(block)));
}
}
void LCodeGen::DoGoto(LGoto* instr) {
EmitGoto(instr->block_id());
}
Condition LCodeGen::TokenToCondition(Token::Value op, bool is_unsigned) {
Condition cond = kNoCondition;
switch (op) {
case Token::EQ:
case Token::EQ_STRICT:
cond = eq;
break;
case Token::NE:
case Token::NE_STRICT:
cond = ne;
break;
case Token::LT:
cond = is_unsigned ? lo : lt;
break;
case Token::GT:
cond = is_unsigned ? hi : gt;
break;
case Token::LTE:
cond = is_unsigned ? ls : le;
break;
case Token::GTE:
cond = is_unsigned ? hs : ge;
break;
case Token::IN:
case Token::INSTANCEOF:
default:
UNREACHABLE();
}
return cond;
}
void LCodeGen::DoCompareNumericAndBranch(LCompareNumericAndBranch* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
bool is_unsigned =
instr->hydrogen()->left()->CheckFlag(HInstruction::kUint32) ||
instr->hydrogen()->right()->CheckFlag(HInstruction::kUint32);
Condition cond = TokenToCondition(instr->op(), is_unsigned);
if (left->IsConstantOperand() && right->IsConstantOperand()) {
// We can statically evaluate the comparison.
double left_val = ToDouble(LConstantOperand::cast(left));
double right_val = ToDouble(LConstantOperand::cast(right));
int next_block = Token::EvalComparison(instr->op(), left_val, right_val)
? instr->TrueDestination(chunk_)
: instr->FalseDestination(chunk_);
EmitGoto(next_block);
} else {
if (instr->is_double()) {
// Compare left and right as doubles and load the
// resulting flags into the normal status register.
FPURegister left_reg = ToDoubleRegister(left);
FPURegister right_reg = ToDoubleRegister(right);
// If a NaN is involved, i.e. the result is unordered,
// jump to false block label.
__ BranchF(NULL, instr->FalseLabel(chunk_), eq,
left_reg, right_reg);
EmitBranchF(instr, cond, left_reg, right_reg);
} else {
Register cmp_left;
Operand cmp_right = Operand((int64_t)0);
if (right->IsConstantOperand()) {
int32_t value = ToInteger32(LConstantOperand::cast(right));
if (instr->hydrogen_value()->representation().IsSmi()) {
cmp_left = ToRegister(left);
cmp_right = Operand(Smi::FromInt(value));
} else {
cmp_left = ToRegister(left);
cmp_right = Operand(value);
}
} else if (left->IsConstantOperand()) {
int32_t value = ToInteger32(LConstantOperand::cast(left));
if (instr->hydrogen_value()->representation().IsSmi()) {
cmp_left = ToRegister(right);
cmp_right = Operand(Smi::FromInt(value));
} else {
cmp_left = ToRegister(right);
cmp_right = Operand(value);
}
// We commuted the operands, so commute the condition.
cond = CommuteCondition(cond);
} else {
cmp_left = ToRegister(left);
cmp_right = Operand(ToRegister(right));
}
EmitBranch(instr, cond, cmp_left, cmp_right);
}
}
}
void LCodeGen::DoCmpObjectEqAndBranch(LCmpObjectEqAndBranch* instr) {
Register left = ToRegister(instr->left());
Register right = ToRegister(instr->right());
EmitBranch(instr, eq, left, Operand(right));
}
void LCodeGen::DoCmpHoleAndBranch(LCmpHoleAndBranch* instr) {
if (instr->hydrogen()->representation().IsTagged()) {
Register input_reg = ToRegister(instr->object());
__ li(at, Operand(factory()->the_hole_value()));
EmitBranch(instr, eq, input_reg, Operand(at));
return;
}
DoubleRegister input_reg = ToDoubleRegister(instr->object());
EmitFalseBranchF(instr, eq, input_reg, input_reg);
Register scratch = scratch0();
__ FmoveHigh(scratch, input_reg);
EmitBranch(instr, eq, scratch,
Operand(static_cast<int32_t>(kHoleNanUpper32)));
}
Condition LCodeGen::EmitIsString(Register input,
Register temp1,
Label* is_not_string,
SmiCheck check_needed = INLINE_SMI_CHECK) {
if (check_needed == INLINE_SMI_CHECK) {
__ JumpIfSmi(input, is_not_string);
}
__ GetObjectType(input, temp1, temp1);
return lt;
}
void LCodeGen::DoIsStringAndBranch(LIsStringAndBranch* instr) {
Register reg = ToRegister(instr->value());
Register temp1 = ToRegister(instr->temp());
SmiCheck check_needed =
instr->hydrogen()->value()->type().IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
Condition true_cond =
EmitIsString(reg, temp1, instr->FalseLabel(chunk_), check_needed);
EmitBranch(instr, true_cond, temp1,
Operand(FIRST_NONSTRING_TYPE));
}
void LCodeGen::DoIsSmiAndBranch(LIsSmiAndBranch* instr) {
Register input_reg = EmitLoadRegister(instr->value(), at);
__ And(at, input_reg, kSmiTagMask);
EmitBranch(instr, eq, at, Operand(zero_reg));
}
void LCodeGen::DoIsUndetectableAndBranch(LIsUndetectableAndBranch* instr) {
Register input = ToRegister(instr->value());
Register temp = ToRegister(instr->temp());
if (!instr->hydrogen()->value()->type().IsHeapObject()) {
__ JumpIfSmi(input, instr->FalseLabel(chunk_));
}
__ ld(temp, FieldMemOperand(input, HeapObject::kMapOffset));
__ lbu(temp, FieldMemOperand(temp, Map::kBitFieldOffset));
__ And(at, temp, Operand(1 << Map::kIsUndetectable));
EmitBranch(instr, ne, at, Operand(zero_reg));
}
static Condition ComputeCompareCondition(Token::Value op) {
switch (op) {
case Token::EQ_STRICT:
case Token::EQ:
return eq;
case Token::LT:
return lt;
case Token::GT:
return gt;
case Token::LTE:
return le;
case Token::GTE:
return ge;
default:
UNREACHABLE();
return kNoCondition;
}
}
void LCodeGen::DoStringCompareAndBranch(LStringCompareAndBranch* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->left()).is(a1));
DCHECK(ToRegister(instr->right()).is(a0));
Handle<Code> code = CodeFactory::StringCompare(isolate(), instr->op()).code();
CallCode(code, RelocInfo::CODE_TARGET, instr);
__ LoadRoot(at, Heap::kTrueValueRootIndex);
EmitBranch(instr, eq, v0, Operand(at));
}
static InstanceType TestType(HHasInstanceTypeAndBranch* instr) {
InstanceType from = instr->from();
InstanceType to = instr->to();
if (from == FIRST_TYPE) return to;
DCHECK(from == to || to == LAST_TYPE);
return from;
}
static Condition BranchCondition(HHasInstanceTypeAndBranch* instr) {
InstanceType from = instr->from();
InstanceType to = instr->to();
if (from == to) return eq;
if (to == LAST_TYPE) return hs;
if (from == FIRST_TYPE) return ls;
UNREACHABLE();
return eq;
}
void LCodeGen::DoHasInstanceTypeAndBranch(LHasInstanceTypeAndBranch* instr) {
Register scratch = scratch0();
Register input = ToRegister(instr->value());
if (!instr->hydrogen()->value()->type().IsHeapObject()) {
__ JumpIfSmi(input, instr->FalseLabel(chunk_));
}
__ GetObjectType(input, scratch, scratch);
EmitBranch(instr,
BranchCondition(instr->hydrogen()),
scratch,
Operand(TestType(instr->hydrogen())));
}
// Branches to a label or falls through with the answer in flags. Trashes
// the temp registers, but not the input.
void LCodeGen::EmitClassOfTest(Label* is_true,
Label* is_false,
Handle<String>class_name,
Register input,
Register temp,
Register temp2) {
DCHECK(!input.is(temp));
DCHECK(!input.is(temp2));
DCHECK(!temp.is(temp2));
__ JumpIfSmi(input, is_false);
__ GetObjectType(input, temp, temp2);
STATIC_ASSERT(LAST_FUNCTION_TYPE == LAST_TYPE);
if (String::Equals(isolate()->factory()->Function_string(), class_name)) {
__ Branch(is_true, hs, temp2, Operand(FIRST_FUNCTION_TYPE));
} else {
__ Branch(is_false, hs, temp2, Operand(FIRST_FUNCTION_TYPE));
}
// Now we are in the FIRST-LAST_NONCALLABLE_SPEC_OBJECT_TYPE range.
// Check if the constructor in the map is a function.
Register instance_type = scratch1();
DCHECK(!instance_type.is(temp));
__ GetMapConstructor(temp, temp, temp2, instance_type);
// Objects with a non-function constructor have class 'Object'.
if (String::Equals(class_name, isolate()->factory()->Object_string())) {
__ Branch(is_true, ne, instance_type, Operand(JS_FUNCTION_TYPE));
} else {
__ Branch(is_false, ne, instance_type, Operand(JS_FUNCTION_TYPE));
}
// temp now contains the constructor function. Grab the
// instance class name from there.
__ ld(temp, FieldMemOperand(temp, JSFunction::kSharedFunctionInfoOffset));
__ ld(temp, FieldMemOperand(temp,
SharedFunctionInfo::kInstanceClassNameOffset));
// The class name we are testing against is internalized since it's a literal.
// The name in the constructor is internalized because of the way the context
// is booted. This routine isn't expected to work for random API-created
// classes and it doesn't have to because you can't access it with natives
// syntax. Since both sides are internalized it is sufficient to use an
// identity comparison.
// End with the address of this class_name instance in temp register.
// On MIPS, the caller must do the comparison with Handle<String>class_name.
}
void LCodeGen::DoClassOfTestAndBranch(LClassOfTestAndBranch* instr) {
Register input = ToRegister(instr->value());
Register temp = scratch0();
Register temp2 = ToRegister(instr->temp());
Handle<String> class_name = instr->hydrogen()->class_name();
EmitClassOfTest(instr->TrueLabel(chunk_), instr->FalseLabel(chunk_),
class_name, input, temp, temp2);
EmitBranch(instr, eq, temp, Operand(class_name));
}
void LCodeGen::DoCmpMapAndBranch(LCmpMapAndBranch* instr) {
Register reg = ToRegister(instr->value());
Register temp = ToRegister(instr->temp());
__ ld(temp, FieldMemOperand(reg, HeapObject::kMapOffset));
EmitBranch(instr, eq, temp, Operand(instr->map()));
}
void LCodeGen::DoHasInPrototypeChainAndBranch(
LHasInPrototypeChainAndBranch* instr) {
Register const object = ToRegister(instr->object());
Register const object_map = scratch0();
Register const object_instance_type = scratch1();
Register const object_prototype = object_map;
Register const prototype = ToRegister(instr->prototype());
// The {object} must be a spec object. It's sufficient to know that {object}
// is not a smi, since all other non-spec objects have {null} prototypes and
// will be ruled out below.
if (instr->hydrogen()->ObjectNeedsSmiCheck()) {
__ SmiTst(object, at);
EmitFalseBranch(instr, eq, at, Operand(zero_reg));
}
// Loop through the {object}s prototype chain looking for the {prototype}.
__ ld(object_map, FieldMemOperand(object, HeapObject::kMapOffset));
Label loop;
__ bind(&loop);
// Deoptimize if the object needs to be access checked.
__ lbu(object_instance_type,
FieldMemOperand(object_map, Map::kBitFieldOffset));
__ And(object_instance_type, object_instance_type,
Operand(1 << Map::kIsAccessCheckNeeded));
DeoptimizeIf(ne, instr, DeoptimizeReason::kAccessCheck, object_instance_type,
Operand(zero_reg));
__ lbu(object_instance_type,
FieldMemOperand(object_map, Map::kInstanceTypeOffset));
DeoptimizeIf(eq, instr, DeoptimizeReason::kProxy, object_instance_type,
Operand(JS_PROXY_TYPE));
__ ld(object_prototype, FieldMemOperand(object_map, Map::kPrototypeOffset));
__ LoadRoot(at, Heap::kNullValueRootIndex);
EmitFalseBranch(instr, eq, object_prototype, Operand(at));
EmitTrueBranch(instr, eq, object_prototype, Operand(prototype));
__ Branch(&loop, USE_DELAY_SLOT);
__ ld(object_map, FieldMemOperand(object_prototype,
HeapObject::kMapOffset)); // In delay slot.
}
void LCodeGen::DoCmpT(LCmpT* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
Token::Value op = instr->op();
Handle<Code> ic = CodeFactory::CompareIC(isolate(), op).code();
CallCode(ic, RelocInfo::CODE_TARGET, instr);
// On MIPS there is no need for a "no inlined smi code" marker (nop).
Condition condition = ComputeCompareCondition(op);
// A minor optimization that relies on LoadRoot always emitting one
// instruction.
Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm());
Label done, check;
__ Branch(USE_DELAY_SLOT, &done, condition, v0, Operand(zero_reg));
__ bind(&check);
__ LoadRoot(ToRegister(instr->result()), Heap::kTrueValueRootIndex);
DCHECK_EQ(1, masm()->InstructionsGeneratedSince(&check));
__ LoadRoot(ToRegister(instr->result()), Heap::kFalseValueRootIndex);
__ bind(&done);
}
void LCodeGen::DoReturn(LReturn* instr) {
if (FLAG_trace && info()->IsOptimizing()) {
// Push the return value on the stack as the parameter.
// Runtime::TraceExit returns its parameter in v0. We're leaving the code
// managed by the register allocator and tearing down the frame, it's
// safe to write to the context register.
__ push(v0);
__ ld(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kTraceExit);
}
if (info()->saves_caller_doubles()) {
RestoreCallerDoubles();
}
if (NeedsEagerFrame()) {
__ mov(sp, fp);
__ Pop(ra, fp);
}
if (instr->has_constant_parameter_count()) {
int parameter_count = ToInteger32(instr->constant_parameter_count());
int32_t sp_delta = (parameter_count + 1) * kPointerSize;
if (sp_delta != 0) {
__ Daddu(sp, sp, Operand(sp_delta));
}
} else {
DCHECK(info()->IsStub()); // Functions would need to drop one more value.
Register reg = ToRegister(instr->parameter_count());
// The argument count parameter is a smi
__ SmiUntag(reg);
__ Dlsa(sp, sp, reg, kPointerSizeLog2);
}
__ Jump(ra);
}
void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
Register context = ToRegister(instr->context());
Register result = ToRegister(instr->result());
__ ld(result, ContextMemOperand(context, instr->slot_index()));
if (instr->hydrogen()->RequiresHoleCheck()) {
__ LoadRoot(at, Heap::kTheHoleValueRootIndex);
if (instr->hydrogen()->DeoptimizesOnHole()) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kHole, result, Operand(at));
} else {
Label is_not_hole;
__ Branch(&is_not_hole, ne, result, Operand(at));
__ LoadRoot(result, Heap::kUndefinedValueRootIndex);
__ bind(&is_not_hole);
}
}
}
void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
Register context = ToRegister(instr->context());
Register value = ToRegister(instr->value());
Register scratch = scratch0();
MemOperand target = ContextMemOperand(context, instr->slot_index());
Label skip_assignment;
if (instr->hydrogen()->RequiresHoleCheck()) {
__ ld(scratch, target);
__ LoadRoot(at, Heap::kTheHoleValueRootIndex);
if (instr->hydrogen()->DeoptimizesOnHole()) {
DeoptimizeIf(eq, instr, DeoptimizeReason::kHole, scratch, Operand(at));
} else {
__ Branch(&skip_assignment, ne, scratch, Operand(at));
}
}
__ sd(value, target);
if (instr->hydrogen()->NeedsWriteBarrier()) {
SmiCheck check_needed =
instr->hydrogen()->value()->type().IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
__ RecordWriteContextSlot(context,
target.offset(),
value,
scratch0(),
GetRAState(),
kSaveFPRegs,
EMIT_REMEMBERED_SET,
check_needed);
}
__ bind(&skip_assignment);
}
void LCodeGen::DoLoadNamedField(LLoadNamedField* instr) {
HObjectAccess access = instr->hydrogen()->access();
int offset = access.offset();
Register object = ToRegister(instr->object());
if (access.IsExternalMemory()) {
Register result = ToRegister(instr->result());
MemOperand operand = MemOperand(object, offset);
__ Load(result, operand, access.representation());
return;
}
if (instr->hydrogen()->representation().IsDouble()) {
DoubleRegister result = ToDoubleRegister(instr->result());
__ ldc1(result, FieldMemOperand(object, offset));
return;
}
Register result = ToRegister(instr->result());
if (!access.IsInobject()) {
__ ld(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
object = result;
}
Representation representation = access.representation();
if (representation.IsSmi() && SmiValuesAre32Bits() &&
instr->hydrogen()->representation().IsInteger32()) {
if (FLAG_debug_code) {
// Verify this is really an Smi.
Register scratch = scratch0();
__ Load(scratch, FieldMemOperand(object, offset), representation);
__ AssertSmi(scratch);
}
// Read int value directly from upper half of the smi.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
offset = SmiWordOffset(offset);
representation = Representation::Integer32();
}
__ Load(result, FieldMemOperand(object, offset), representation);
}
void LCodeGen::DoLoadFunctionPrototype(LLoadFunctionPrototype* instr) {
Register scratch = scratch0();
Register function = ToRegister(instr->function());
Register result = ToRegister(instr->result());
// Get the prototype or initial map from the function.
__ ld(result,
FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
// Check that the function has a prototype or an initial map.
__ LoadRoot(at, Heap::kTheHoleValueRootIndex);
DeoptimizeIf(eq, instr, DeoptimizeReason::kHole, result, Operand(at));
// If the function does not have an initial map, we're done.
Label done;
__ GetObjectType(result, scratch, scratch);
__ Branch(&done, ne, scratch, Operand(MAP_TYPE));
// Get the prototype from the initial map.
__ ld(result, FieldMemOperand(result, Map::kPrototypeOffset));
// All done.
__ bind(&done);
}
void LCodeGen::DoLoadRoot(LLoadRoot* instr) {
Register result = ToRegister(instr->result());
__ LoadRoot(result, instr->index());
}
void LCodeGen::DoAccessArgumentsAt(LAccessArgumentsAt* instr) {
Register arguments = ToRegister(instr->arguments());
Register result = ToRegister(instr->result());
// There are two words between the frame pointer and the last argument.
// Subtracting from length accounts for one of them add one more.
if (instr->length()->IsConstantOperand()) {
int const_length = ToInteger32(LConstantOperand::cast(instr->length()));
if (instr->index()->IsConstantOperand()) {
int const_index = ToInteger32(LConstantOperand::cast(instr->index()));
int index = (const_length - const_index) + 1;
__ ld(result, MemOperand(arguments, index * kPointerSize));
} else {
Register index = ToRegister(instr->index());
__ li(at, Operand(const_length + 1));
__ Dsubu(result, at, index);
__ Dlsa(at, arguments, result, kPointerSizeLog2);
__ ld(result, MemOperand(at));
}
} else if (instr->index()->IsConstantOperand()) {
Register length = ToRegister(instr->length());
int const_index = ToInteger32(LConstantOperand::cast(instr->index()));
int loc = const_index - 1;
if (loc != 0) {
__ Dsubu(result, length, Operand(loc));
__ Dlsa(at, arguments, result, kPointerSizeLog2);
__ ld(result, MemOperand(at));
} else {
__ Dlsa(at, arguments, length, kPointerSizeLog2);
__ ld(result, MemOperand(at));
}
} else {
Register length = ToRegister(instr->length());
Register index = ToRegister(instr->index());
__ Dsubu(result, length, index);
__ Daddu(result, result, 1);
__ Dlsa(at, arguments, result, kPointerSizeLog2);
__ ld(result, MemOperand(at));
}
}
void LCodeGen::DoLoadKeyedExternalArray(LLoadKeyed* instr) {
Register external_pointer = ToRegister(instr->elements());
Register key = no_reg;
ElementsKind elements_kind = instr->elements_kind();
bool key_is_constant = instr->key()->IsConstantOperand();
int constant_key = 0;
if (key_is_constant) {
constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
if (constant_key & 0xF0000000) {
Abort(kArrayIndexConstantValueTooBig);
}
} else {
key = ToRegister(instr->key());
}
int element_size_shift = ElementsKindToShiftSize(elements_kind);
int shift_size = (instr->hydrogen()->key()->representation().IsSmi())
? (element_size_shift - (kSmiTagSize + kSmiShiftSize))
: element_size_shift;
int base_offset = instr->base_offset();
if (elements_kind == FLOAT32_ELEMENTS || elements_kind == FLOAT64_ELEMENTS) {
FPURegister result = ToDoubleRegister(instr->result());
if (key_is_constant) {
__ Daddu(scratch0(), external_pointer,
constant_key << element_size_shift);
} else {
if (shift_size < 0) {
if (shift_size == -32) {
__ dsra32(scratch0(), key, 0);
} else {
__ dsra(scratch0(), key, -shift_size);
}
} else {
__ dsll(scratch0(), key, shift_size);
}
__ Daddu(scratch0(), scratch0(), external_pointer);
}
if (elements_kind == FLOAT32_ELEMENTS) {
__ lwc1(result, MemOperand(scratch0(), base_offset));
__ cvt_d_s(result, result);
} else { // i.e. elements_kind == EXTERNAL_DOUBLE_ELEMENTS
__ ldc1(result, MemOperand(scratch0(), base_offset));
}
} else {
Register result = ToRegister(instr->result());
MemOperand mem_operand = PrepareKeyedOperand(
key, external_pointer, key_is_constant, constant_key,
element_size_shift, shift_size, base_offset);
switch (elements_kind) {
case INT8_ELEMENTS:
__ lb(result, mem_operand);
break;
case UINT8_ELEMENTS:
case UINT8_CLAMPED_ELEMENTS:
__ lbu(result, mem_operand);
break;
case INT16_ELEMENTS:
__ lh(result, mem_operand);
break;
case UINT16_ELEMENTS:
__ lhu(result, mem_operand);
break;
case INT32_ELEMENTS:
__ lw(result, mem_operand);
break;
case UINT32_ELEMENTS:
__ lw(result, mem_operand);
if (!instr->hydrogen()->CheckFlag(HInstruction::kUint32)) {
DeoptimizeIf(Ugreater_equal, instr, DeoptimizeReason::kNegativeValue,
result, Operand(0x80000000));
}
break;
case FLOAT32_ELEMENTS:
case FLOAT64_ELEMENTS:
case FAST_DOUBLE_ELEMENTS:
case FAST_ELEMENTS:
case FAST_SMI_ELEMENTS:
case FAST_HOLEY_DOUBLE_ELEMENTS:
case FAST_HOLEY_ELEMENTS:
case FAST_HOLEY_SMI_ELEMENTS:
case DICTIONARY_ELEMENTS:
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
case FAST_STRING_WRAPPER_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS:
case NO_ELEMENTS:
UNREACHABLE();
break;
}
}
}
void LCodeGen::DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr) {
Register elements = ToRegister(instr->elements());
bool key_is_constant = instr->key()->IsConstantOperand();
Register key = no_reg;
DoubleRegister result = ToDoubleRegister(instr->result());
Register scratch = scratch0();
int element_size_shift = ElementsKindToShiftSize(FAST_DOUBLE_ELEMENTS);
int base_offset = instr->base_offset();
if (key_is_constant) {
int constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
if (constant_key & 0xF0000000) {
Abort(kArrayIndexConstantValueTooBig);
}
base_offset += constant_key * kDoubleSize;
}
__ Daddu(scratch, elements, Operand(base_offset));
if (!key_is_constant) {
key = ToRegister(instr->key());
int shift_size = (instr->hydrogen()->key()->representation().IsSmi())
? (element_size_shift - (kSmiTagSize + kSmiShiftSize))
: element_size_shift;
if (shift_size > 0) {
__ dsll(at, key, shift_size);
} else if (shift_size == -32) {
__ dsra32(at, key, 0);
} else {
__ dsra(at, key, -shift_size);
}
__ Daddu(scratch, scratch, at);
}
__ ldc1(result, MemOperand(scratch));
if (instr->hydrogen()->RequiresHoleCheck()) {
__ FmoveHigh(scratch, result);
DeoptimizeIf(eq, instr, DeoptimizeReason::kHole, scratch,
Operand(static_cast<int32_t>(kHoleNanUpper32)));
}
}
void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
HLoadKeyed* hinstr = instr->hydrogen();
Register elements = ToRegister(instr->elements());
Register result = ToRegister(instr->result());
Register scratch = scratch0();
Register store_base = scratch;
int offset = instr->base_offset();
if (instr->key()->IsConstantOperand()) {
LConstantOperand* const_operand = LConstantOperand::cast(instr->key());
offset += ToInteger32(const_operand) * kPointerSize;
store_base = elements;
} else {
Register key = ToRegister(instr->key());
// Even though the HLoadKeyed instruction forces the input
// representation for the key to be an integer, the input gets replaced
// during bound check elimination with the index argument to the bounds
// check, which can be tagged, so that case must be handled here, too.
if (instr->hydrogen()->key()->representation().IsSmi()) {
__ SmiScale(scratch, key, kPointerSizeLog2);
__ daddu(scratch, elements, scratch);
} else {
__ Dlsa(scratch, elements, key, kPointerSizeLog2);
}
}
Representation representation = hinstr->representation();
if (representation.IsInteger32() && SmiValuesAre32Bits() &&
hinstr->elements_kind() == FAST_SMI_ELEMENTS) {
DCHECK(!hinstr->RequiresHoleCheck());
if (FLAG_debug_code) {
Register temp = scratch1();
__ Load(temp, MemOperand(store_base, offset), Representation::Smi());
__ AssertSmi(temp);
}
// Read int value directly from upper half of the smi.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
offset = SmiWordOffset(offset);
}
__ Load(result, MemOperand(store_base, offset), representation);
// Check for the hole value.
if (hinstr->RequiresHoleCheck()) {
if (IsFastSmiElementsKind(instr->hydrogen()->elements_kind())) {
__ SmiTst(result, scratch);
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotASmi, scratch,
Operand(zero_reg));
} else {
__ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
DeoptimizeIf(eq, instr, DeoptimizeReason::kHole, result,
Operand(scratch));
}
} else if (instr->hydrogen()->hole_mode() == CONVERT_HOLE_TO_UNDEFINED) {
DCHECK(instr->hydrogen()->elements_kind() == FAST_HOLEY_ELEMENTS);
Label done;
__ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
__ Branch(&done, ne, result, Operand(scratch));
if (info()->IsStub()) {
// A stub can safely convert the hole to undefined only if the array
// protector cell contains (Smi) Isolate::kProtectorValid. Otherwise
// it needs to bail out.
__ LoadRoot(result, Heap::kArrayProtectorRootIndex);
// The comparison only needs LS bits of value, which is a smi.
__ ld(result, FieldMemOperand(result, PropertyCell::kValueOffset));
DeoptimizeIf(ne, instr, DeoptimizeReason::kHole, result,
Operand(Smi::FromInt(Isolate::kProtectorValid)));
}
__ LoadRoot(result, Heap::kUndefinedValueRootIndex);
__ bind(&done);
}
}
void LCodeGen::DoLoadKeyed(LLoadKeyed* instr) {
if (instr->is_fixed_typed_array()) {
DoLoadKeyedExternalArray(instr);
} else if (instr->hydrogen()->representation().IsDouble()) {
DoLoadKeyedFixedDoubleArray(instr);
} else {
DoLoadKeyedFixedArray(instr);
}
}
MemOperand LCodeGen::PrepareKeyedOperand(Register key,
Register base,
bool key_is_constant,
int constant_key,
int element_size,
int shift_size,
int base_offset) {
if (key_is_constant) {
return MemOperand(base, (constant_key << element_size) + base_offset);
}
if (base_offset == 0) {
if (shift_size >= 0) {
__ dsll(scratch0(), key, shift_size);
__ Daddu(scratch0(), base, scratch0());
return MemOperand(scratch0());
} else {
if (shift_size == -32) {
__ dsra32(scratch0(), key, 0);
} else {
__ dsra(scratch0(), key, -shift_size);
}
__ Daddu(scratch0(), base, scratch0());
return MemOperand(scratch0());
}
}
if (shift_size >= 0) {
__ dsll(scratch0(), key, shift_size);
__ Daddu(scratch0(), base, scratch0());
return MemOperand(scratch0(), base_offset);
} else {
if (shift_size == -32) {
__ dsra32(scratch0(), key, 0);
} else {
__ dsra(scratch0(), key, -shift_size);
}
__ Daddu(scratch0(), base, scratch0());
return MemOperand(scratch0(), base_offset);
}
}
void LCodeGen::DoArgumentsElements(LArgumentsElements* instr) {
Register scratch = scratch0();
Register temp = scratch1();
Register result = ToRegister(instr->result());
if (instr->hydrogen()->from_inlined()) {
__ Dsubu(result, sp, 2 * kPointerSize);
} else if (instr->hydrogen()->arguments_adaptor()) {
// Check if the calling frame is an arguments adaptor frame.
Label done, adapted;
__ ld(scratch, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ld(result,
MemOperand(scratch, CommonFrameConstants::kContextOrFrameTypeOffset));
__ Xor(temp, result,
Operand(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
// Result is the frame pointer for the frame if not adapted and for the real
// frame below the adaptor frame if adapted.
__ Movn(result, fp, temp); // Move only if temp is not equal to zero (ne).
__ Movz(result, scratch, temp); // Move only if temp is equal to zero (eq).
} else {
__ mov(result, fp);
}
}
void LCodeGen::DoArgumentsLength(LArgumentsLength* instr) {
Register elem = ToRegister(instr->elements());
Register result = ToRegister(instr->result());
Label done;
// If no arguments adaptor frame the number of arguments is fixed.
__ Daddu(result, zero_reg, Operand(scope()->num_parameters()));
__ Branch(&done, eq, fp, Operand(elem));
// Arguments adaptor frame present. Get argument length from there.
__ ld(result, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ld(result,
MemOperand(result, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ SmiUntag(result);
// Argument length is in result register.
__ bind(&done);
}
void LCodeGen::DoWrapReceiver(LWrapReceiver* instr) {
Register receiver = ToRegister(instr->receiver());
Register function = ToRegister(instr->function());
Register result = ToRegister(instr->result());
Register scratch = scratch0();
// If the receiver is null or undefined, we have to pass the global
// object as a receiver to normal functions. Values have to be
// passed unchanged to builtins and strict-mode functions.
Label global_object, result_in_receiver;
if (!instr->hydrogen()->known_function()) {
// Do not transform the receiver to object for strict mode functions.
__ ld(scratch,
FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
// Do not transform the receiver to object for builtins.
int32_t strict_mode_function_mask =
1 << SharedFunctionInfo::kStrictModeBitWithinByte;
int32_t native_mask = 1 << SharedFunctionInfo::kNativeBitWithinByte;
__ lbu(at,
FieldMemOperand(scratch, SharedFunctionInfo::kStrictModeByteOffset));
__ And(at, at, Operand(strict_mode_function_mask));
__ Branch(&result_in_receiver, ne, at, Operand(zero_reg));
__ lbu(at,
FieldMemOperand(scratch, SharedFunctionInfo::kNativeByteOffset));
__ And(at, at, Operand(native_mask));
__ Branch(&result_in_receiver, ne, at, Operand(zero_reg));
}
// Normal function. Replace undefined or null with global receiver.
__ LoadRoot(scratch, Heap::kNullValueRootIndex);
__ Branch(&global_object, eq, receiver, Operand(scratch));
__ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
__ Branch(&global_object, eq, receiver, Operand(scratch));
// Deoptimize if the receiver is not a JS object.
__ SmiTst(receiver, scratch);
DeoptimizeIf(eq, instr, DeoptimizeReason::kSmi, scratch, Operand(zero_reg));
__ GetObjectType(receiver, scratch, scratch);
DeoptimizeIf(lt, instr, DeoptimizeReason::kNotAJavaScriptObject, scratch,
Operand(FIRST_JS_RECEIVER_TYPE));
__ Branch(&result_in_receiver);
__ bind(&global_object);
__ ld(result, FieldMemOperand(function, JSFunction::kContextOffset));
__ ld(result, ContextMemOperand(result, Context::NATIVE_CONTEXT_INDEX));
__ ld(result, ContextMemOperand(result, Context::GLOBAL_PROXY_INDEX));
if (result.is(receiver)) {
__ bind(&result_in_receiver);
} else {
Label result_ok;
__ Branch(&result_ok);
__ bind(&result_in_receiver);
__ mov(result, receiver);
__ bind(&result_ok);
}
}
void LCodeGen::DoApplyArguments(LApplyArguments* instr) {
Register receiver = ToRegister(instr->receiver());
Register function = ToRegister(instr->function());
Register length = ToRegister(instr->length());
Register elements = ToRegister(instr->elements());
Register scratch = scratch0();
DCHECK(receiver.is(a0)); // Used for parameter count.
DCHECK(function.is(a1)); // Required by InvokeFunction.
DCHECK(ToRegister(instr->result()).is(v0));
// Copy the arguments to this function possibly from the
// adaptor frame below it.
const uint32_t kArgumentsLimit = 1 * KB;
DeoptimizeIf(hi, instr, DeoptimizeReason::kTooManyArguments, length,
Operand(kArgumentsLimit));
// Push the receiver and use the register to keep the original
// number of arguments.
__ push(receiver);
__ Move(receiver, length);
// The arguments are at a one pointer size offset from elements.
__ Daddu(elements, elements, Operand(1 * kPointerSize));
// Loop through the arguments pushing them onto the execution
// stack.
Label invoke, loop;
// length is a small non-negative integer, due to the test above.
__ Branch(USE_DELAY_SLOT, &invoke, eq, length, Operand(zero_reg));
__ dsll(scratch, length, kPointerSizeLog2);
__ bind(&loop);
__ Daddu(scratch, elements, scratch);
__ ld(scratch, MemOperand(scratch));
__ push(scratch);
__ Dsubu(length, length, Operand(1));
__ Branch(USE_DELAY_SLOT, &loop, ne, length, Operand(zero_reg));
__ dsll(scratch, length, kPointerSizeLog2);
__ bind(&invoke);
InvokeFlag flag = CALL_FUNCTION;
if (instr->hydrogen()->tail_call_mode() == TailCallMode::kAllow) {
DCHECK(!info()->saves_caller_doubles());
// TODO(ishell): drop current frame before pushing arguments to the stack.
flag = JUMP_FUNCTION;
ParameterCount actual(a0);
// It is safe to use t0, t1 and t2 as scratch registers here given that
// we are not going to return to caller function anyway.
PrepareForTailCall(actual, t0, t1, t2);
}
DCHECK(instr->HasPointerMap());
LPointerMap* pointers = instr->pointer_map();
SafepointGenerator safepoint_generator(this, pointers, Safepoint::kLazyDeopt);
// The number of arguments is stored in receiver which is a0, as expected
// by InvokeFunction.
ParameterCount actual(receiver);
__ InvokeFunction(function, no_reg, actual, flag, safepoint_generator);
}
void LCodeGen::DoPushArgument(LPushArgument* instr) {
LOperand* argument = instr->value();
if (argument->IsDoubleRegister() || argument->IsDoubleStackSlot()) {
Abort(kDoPushArgumentNotImplementedForDoubleType);
} else {
Register argument_reg = EmitLoadRegister(argument, at);
__ push(argument_reg);
}
}
void LCodeGen::DoDrop(LDrop* instr) {
__ Drop(instr->count());
}
void LCodeGen::DoThisFunction(LThisFunction* instr) {
Register result = ToRegister(instr->result());
__ ld(result, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
}
void LCodeGen::DoContext(LContext* instr) {
// If there is a non-return use, the context must be moved to a register.
Register result = ToRegister(instr->result());
if (info()->IsOptimizing()) {
__ ld(result, MemOperand(fp, StandardFrameConstants::kContextOffset));
} else {
// If there is no frame, the context must be in cp.
DCHECK(result.is(cp));
}
}
void LCodeGen::DoDeclareGlobals(LDeclareGlobals* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
__ li(scratch0(), instr->hydrogen()->declarations());
__ li(scratch1(), Operand(Smi::FromInt(instr->hydrogen()->flags())));
__ Push(scratch0(), scratch1());
__ li(scratch0(), instr->hydrogen()->feedback_vector());
__ Push(scratch0());
CallRuntime(Runtime::kDeclareGlobals, instr);
}
void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
int formal_parameter_count, int arity,
bool is_tail_call, LInstruction* instr) {
bool dont_adapt_arguments =
formal_parameter_count == SharedFunctionInfo::kDontAdaptArgumentsSentinel;
bool can_invoke_directly =
dont_adapt_arguments || formal_parameter_count == arity;
Register function_reg = a1;
LPointerMap* pointers = instr->pointer_map();
if (can_invoke_directly) {
// Change context.
__ ld(cp, FieldMemOperand(function_reg, JSFunction::kContextOffset));
// Always initialize new target and number of actual arguments.
__ LoadRoot(a3, Heap::kUndefinedValueRootIndex);
__ li(a0, Operand(arity));
bool is_self_call = function.is_identical_to(info()->closure());
// Invoke function.
if (is_self_call) {
Handle<Code> self(reinterpret_cast<Code**>(__ CodeObject().location()));
if (is_tail_call) {
__ Jump(self, RelocInfo::CODE_TARGET);
} else {
__ Call(self, RelocInfo::CODE_TARGET);
}
} else {
__ ld(at, FieldMemOperand(function_reg, JSFunction::kCodeEntryOffset));
if (is_tail_call) {
__ Jump(at);
} else {
__ Call(at);
}
}
if (!is_tail_call) {
// Set up deoptimization.
RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT);
}
} else {
SafepointGenerator generator(this, pointers, Safepoint::kLazyDeopt);
ParameterCount actual(arity);
ParameterCount expected(formal_parameter_count);
InvokeFlag flag = is_tail_call ? JUMP_FUNCTION : CALL_FUNCTION;
__ InvokeFunction(function_reg, expected, actual, flag, generator);
}
}
void LCodeGen::DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr) {
DCHECK(instr->context() != NULL);
DCHECK(ToRegister(instr->context()).is(cp));
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
Register scratch = scratch0();
// Deoptimize if not a heap number.
__ ld(scratch, FieldMemOperand(input, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotAHeapNumber, scratch,
Operand(at));
Label done;
Register exponent = scratch0();
scratch = no_reg;
__ lwu(exponent, FieldMemOperand(input, HeapNumber::kExponentOffset));
// Check the sign of the argument. If the argument is positive, just
// return it.
__ Move(result, input);
__ And(at, exponent, Operand(HeapNumber::kSignMask));
__ Branch(&done, eq, at, Operand(zero_reg));
// Input is negative. Reverse its sign.
// Preserve the value of all registers.
{
PushSafepointRegistersScope scope(this);
// Registers were saved at the safepoint, so we can use
// many scratch registers.
Register tmp1 = input.is(a1) ? a0 : a1;
Register tmp2 = input.is(a2) ? a0 : a2;
Register tmp3 = input.is(a3) ? a0 : a3;
Register tmp4 = input.is(a4) ? a0 : a4;
// exponent: floating point exponent value.
Label allocated, slow;
__ LoadRoot(tmp4, Heap::kHeapNumberMapRootIndex);
__ AllocateHeapNumber(tmp1, tmp2, tmp3, tmp4, &slow);
__ Branch(&allocated);
// Slow case: Call the runtime system to do the number allocation.
__ bind(&slow);
CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr,
instr->context());
// Set the pointer to the new heap number in tmp.
if (!tmp1.is(v0))
__ mov(tmp1, v0);
// Restore input_reg after call to runtime.
__ LoadFromSafepointRegisterSlot(input, input);
__ lwu(exponent, FieldMemOperand(input, HeapNumber::kExponentOffset));
__ bind(&allocated);
// exponent: floating point exponent value.
// tmp1: allocated heap number.
__ And(exponent, exponent, Operand(~HeapNumber::kSignMask));
__ sw(exponent, FieldMemOperand(tmp1, HeapNumber::kExponentOffset));
__ lwu(tmp2, FieldMemOperand(input, HeapNumber::kMantissaOffset));
__ sw(tmp2, FieldMemOperand(tmp1, HeapNumber::kMantissaOffset));
__ StoreToSafepointRegisterSlot(tmp1, result);
}
__ bind(&done);
}
void LCodeGen::EmitIntegerMathAbs(LMathAbs* instr) {
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
Label done;
__ Branch(USE_DELAY_SLOT, &done, ge, input, Operand(zero_reg));
__ mov(result, input);
__ subu(result, zero_reg, input);
// Overflow if result is still negative, i.e. 0x80000000.
DeoptimizeIf(lt, instr, DeoptimizeReason::kOverflow, result,
Operand(zero_reg));
__ bind(&done);
}
void LCodeGen::EmitSmiMathAbs(LMathAbs* instr) {
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
Label done;
__ Branch(USE_DELAY_SLOT, &done, ge, input, Operand(zero_reg));
__ mov(result, input);
__ dsubu(result, zero_reg, input);
// Overflow if result is still negative, i.e. 0x80000000 00000000.
DeoptimizeIf(lt, instr, DeoptimizeReason::kOverflow, result,
Operand(zero_reg));
__ bind(&done);
}
void LCodeGen::DoMathAbs(LMathAbs* instr) {
// Class for deferred case.
class DeferredMathAbsTaggedHeapNumber final : public LDeferredCode {
public:
DeferredMathAbsTaggedHeapNumber(LCodeGen* codegen, LMathAbs* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override {
codegen()->DoDeferredMathAbsTaggedHeapNumber(instr_);
}
LInstruction* instr() override { return instr_; }
private:
LMathAbs* instr_;
};
Representation r = instr->hydrogen()->value()->representation();
if (r.IsDouble()) {
FPURegister input = ToDoubleRegister(instr->value());
FPURegister result = ToDoubleRegister(instr->result());
__ abs_d(result, input);
} else if (r.IsInteger32()) {
EmitIntegerMathAbs(instr);
} else if (r.IsSmi()) {
EmitSmiMathAbs(instr);
} else {
// Representation is tagged.
DeferredMathAbsTaggedHeapNumber* deferred =
new(zone()) DeferredMathAbsTaggedHeapNumber(this, instr);
Register input = ToRegister(instr->value());
// Smi check.
__ JumpIfNotSmi(input, deferred->entry());
// If smi, handle it directly.
EmitSmiMathAbs(instr);
__ bind(deferred->exit());
}
}
void LCodeGen::DoMathFloor(LMathFloor* instr) {
DoubleRegister input = ToDoubleRegister(instr->value());
Register result = ToRegister(instr->result());
Register scratch1 = scratch0();
Register except_flag = ToRegister(instr->temp());
__ EmitFPUTruncate(kRoundToMinusInf,
result,
input,
scratch1,
double_scratch0(),
except_flag);
// Deopt if the operation did not succeed.
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecisionOrNaN, except_flag,
Operand(zero_reg));
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
// Test for -0.
Label done;
__ Branch(&done, ne, result, Operand(zero_reg));
__ mfhc1(scratch1, input); // Get exponent/sign bits.
__ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, DeoptimizeReason::kMinusZero, scratch1,
Operand(zero_reg));
__ bind(&done);
}
}
void LCodeGen::DoMathRound(LMathRound* instr) {
DoubleRegister input = ToDoubleRegister(instr->value());
Register result = ToRegister(instr->result());
DoubleRegister double_scratch1 = ToDoubleRegister(instr->temp());
Register scratch = scratch0();
Label done, check_sign_on_zero;
// Extract exponent bits.
__ mfhc1(result, input);
__ Ext(scratch,
result,
HeapNumber::kExponentShift,
HeapNumber::kExponentBits);
// If the number is in ]-0.5, +0.5[, the result is +/- 0.
Label skip1;
__ Branch(&skip1, gt, scratch, Operand(HeapNumber::kExponentBias - 2));
__ mov(result, zero_reg);
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
__ Branch(&check_sign_on_zero);
} else {
__ Branch(&done);
}
__ bind(&skip1);
// The following conversion will not work with numbers
// outside of ]-2^32, 2^32[.
DeoptimizeIf(ge, instr, DeoptimizeReason::kOverflow, scratch,
Operand(HeapNumber::kExponentBias + 32));
// Save the original sign for later comparison.
__ And(scratch, result, Operand(HeapNumber::kSignMask));
__ Move(double_scratch0(), 0.5);
__ add_d(double_scratch0(), input, double_scratch0());
// Check sign of the result: if the sign changed, the input
// value was in ]0.5, 0[ and the result should be -0.
__ mfhc1(result, double_scratch0());
// mfhc1 sign-extends, clear the upper bits.
__ dsll32(result, result, 0);
__ dsrl32(result, result, 0);
__ Xor(result, result, Operand(scratch));
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
// ARM uses 'mi' here, which is 'lt'
DeoptimizeIf(lt, instr, DeoptimizeReason::kMinusZero, result,
Operand(zero_reg));
} else {
Label skip2;
// ARM uses 'mi' here, which is 'lt'
// Negating it results in 'ge'
__ Branch(&skip2, ge, result, Operand(zero_reg));
__ mov(result, zero_reg);
__ Branch(&done);
__ bind(&skip2);
}
Register except_flag = scratch;
__ EmitFPUTruncate(kRoundToMinusInf,
result,
double_scratch0(),
at,
double_scratch1,
except_flag);
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecisionOrNaN, except_flag,
Operand(zero_reg));
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
// Test for -0.
__ Branch(&done, ne, result, Operand(zero_reg));
__ bind(&check_sign_on_zero);
__ mfhc1(scratch, input); // Get exponent/sign bits.
__ And(scratch, scratch, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, DeoptimizeReason::kMinusZero, scratch,
Operand(zero_reg));
}
__ bind(&done);
}
void LCodeGen::DoMathFround(LMathFround* instr) {
DoubleRegister input = ToDoubleRegister(instr->value());
DoubleRegister result = ToDoubleRegister(instr->result());
__ cvt_s_d(result, input);
__ cvt_d_s(result, result);
}
void LCodeGen::DoMathSqrt(LMathSqrt* instr) {
DoubleRegister input = ToDoubleRegister(instr->value());
DoubleRegister result = ToDoubleRegister(instr->result());
__ sqrt_d(result, input);
}
void LCodeGen::DoMathPowHalf(LMathPowHalf* instr) {
DoubleRegister input = ToDoubleRegister(instr->value());
DoubleRegister result = ToDoubleRegister(instr->result());
DoubleRegister temp = ToDoubleRegister(instr->temp());
DCHECK(!input.is(result));
// Note that according to ECMA-262 15.8.2.13:
// Math.pow(-Infinity, 0.5) == Infinity
// Math.sqrt(-Infinity) == NaN
Label done;
__ Move(temp, static_cast<double>(-V8_INFINITY));
// Set up Infinity.
__ Neg_d(result, temp);
// result is overwritten if the branch is not taken.
__ BranchF(&done, NULL, eq, temp, input);
// Add +0 to convert -0 to +0.
__ add_d(result, input, kDoubleRegZero);
__ sqrt_d(result, result);
__ bind(&done);
}
void LCodeGen::DoPower(LPower* instr) {
Representation exponent_type = instr->hydrogen()->right()->representation();
// Having marked this as a call, we can use any registers.
// Just make sure that the input/output registers are the expected ones.
Register tagged_exponent = MathPowTaggedDescriptor::exponent();
DCHECK(!instr->right()->IsDoubleRegister() ||
ToDoubleRegister(instr->right()).is(f4));
DCHECK(!instr->right()->IsRegister() ||
ToRegister(instr->right()).is(tagged_exponent));
DCHECK(ToDoubleRegister(instr->left()).is(f2));
DCHECK(ToDoubleRegister(instr->result()).is(f0));
if (exponent_type.IsSmi()) {
MathPowStub stub(isolate(), MathPowStub::TAGGED);
__ CallStub(&stub);
} else if (exponent_type.IsTagged()) {
Label no_deopt;
__ JumpIfSmi(tagged_exponent, &no_deopt);
DCHECK(!a7.is(tagged_exponent));
__ lw(a7, FieldMemOperand(tagged_exponent, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotAHeapNumber, a7, Operand(at));
__ bind(&no_deopt);
MathPowStub stub(isolate(), MathPowStub::TAGGED);
__ CallStub(&stub);
} else if (exponent_type.IsInteger32()) {
MathPowStub stub(isolate(), MathPowStub::INTEGER);
__ CallStub(&stub);
} else {
DCHECK(exponent_type.IsDouble());
MathPowStub stub(isolate(), MathPowStub::DOUBLE);
__ CallStub(&stub);
}
}
void LCodeGen::DoMathCos(LMathCos* instr) {
__ PrepareCallCFunction(0, 1, scratch0());
__ MovToFloatParameter(ToDoubleRegister(instr->value()));
__ CallCFunction(ExternalReference::ieee754_cos_function(isolate()), 0, 1);
__ MovFromFloatResult(ToDoubleRegister(instr->result()));
}
void LCodeGen::DoMathSin(LMathSin* instr) {
__ PrepareCallCFunction(0, 1, scratch0());
__ MovToFloatParameter(ToDoubleRegister(instr->value()));
__ CallCFunction(ExternalReference::ieee754_sin_function(isolate()), 0, 1);
__ MovFromFloatResult(ToDoubleRegister(instr->result()));
}
void LCodeGen::DoMathExp(LMathExp* instr) {
__ PrepareCallCFunction(0, 1, scratch0());
__ MovToFloatParameter(ToDoubleRegister(instr->value()));
__ CallCFunction(ExternalReference::ieee754_exp_function(isolate()), 0, 1);
__ MovFromFloatResult(ToDoubleRegister(instr->result()));
}
void LCodeGen::DoMathLog(LMathLog* instr) {
__ PrepareCallCFunction(0, 1, scratch0());
__ MovToFloatParameter(ToDoubleRegister(instr->value()));
__ CallCFunction(ExternalReference::ieee754_log_function(isolate()), 0, 1);
__ MovFromFloatResult(ToDoubleRegister(instr->result()));
}
void LCodeGen::DoMathClz32(LMathClz32* instr) {
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
__ Clz(result, input);
}
void LCodeGen::PrepareForTailCall(const ParameterCount& actual,
Register scratch1, Register scratch2,
Register scratch3) {
#if DEBUG
if (actual.is_reg()) {
DCHECK(!AreAliased(actual.reg(), scratch1, scratch2, scratch3));
} else {
DCHECK(!AreAliased(scratch1, scratch2, scratch3));
}
#endif
if (FLAG_code_comments) {
if (actual.is_reg()) {
Comment(";;; PrepareForTailCall, actual: %s {",
RegisterConfiguration::Crankshaft()->GetGeneralRegisterName(
actual.reg().code()));
} else {
Comment(";;; PrepareForTailCall, actual: %d {", actual.immediate());
}
}
// Check if next frame is an arguments adaptor frame.
Register caller_args_count_reg = scratch1;
Label no_arguments_adaptor, formal_parameter_count_loaded;
__ ld(scratch2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ld(scratch3, MemOperand(scratch2, StandardFrameConstants::kContextOffset));
__ Branch(&no_arguments_adaptor, ne, scratch3,
Operand(StackFrame::TypeToMarker(StackFrame::ARGUMENTS_ADAPTOR)));
// Drop current frame and load arguments count from arguments adaptor frame.
__ mov(fp, scratch2);
__ ld(caller_args_count_reg,
MemOperand(fp, ArgumentsAdaptorFrameConstants::kLengthOffset));
__ SmiUntag(caller_args_count_reg);
__ Branch(&formal_parameter_count_loaded);
__ bind(&no_arguments_adaptor);
// Load caller's formal parameter count
__ li(caller_args_count_reg, Operand(info()->literal()->parameter_count()));
__ bind(&formal_parameter_count_loaded);
__ PrepareForTailCall(actual, caller_args_count_reg, scratch2, scratch3);
Comment(";;; }");
}
void LCodeGen::DoInvokeFunction(LInvokeFunction* instr) {
HInvokeFunction* hinstr = instr->hydrogen();
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->function()).is(a1));
DCHECK(instr->HasPointerMap());
bool is_tail_call = hinstr->tail_call_mode() == TailCallMode::kAllow;
if (is_tail_call) {
DCHECK(!info()->saves_caller_doubles());
ParameterCount actual(instr->arity());
// It is safe to use t0, t1 and t2 as scratch registers here given that
// we are not going to return to caller function anyway.
PrepareForTailCall(actual, t0, t1, t2);
}
Handle<JSFunction> known_function = hinstr->known_function();
if (known_function.is_null()) {
LPointerMap* pointers = instr->pointer_map();
SafepointGenerator generator(this, pointers, Safepoint::kLazyDeopt);
ParameterCount actual(instr->arity());
InvokeFlag flag = is_tail_call ? JUMP_FUNCTION : CALL_FUNCTION;
__ InvokeFunction(a1, no_reg, actual, flag, generator);
} else {
CallKnownFunction(known_function, hinstr->formal_parameter_count(),
instr->arity(), is_tail_call, instr);
}
}
void LCodeGen::DoCallWithDescriptor(LCallWithDescriptor* instr) {
DCHECK(ToRegister(instr->result()).is(v0));
if (instr->hydrogen()->IsTailCall()) {
if (NeedsEagerFrame()) __ LeaveFrame(StackFrame::INTERNAL);
if (instr->target()->IsConstantOperand()) {
LConstantOperand* target = LConstantOperand::cast(instr->target());
Handle<Code> code = Handle<Code>::cast(ToHandle(target));
__ Jump(code, RelocInfo::CODE_TARGET);
} else {
DCHECK(instr->target()->IsRegister());
Register target = ToRegister(instr->target());
__ Daddu(target, target, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Jump(target);
}
} else {
LPointerMap* pointers = instr->pointer_map();
SafepointGenerator generator(this, pointers, Safepoint::kLazyDeopt);
if (instr->target()->IsConstantOperand()) {
LConstantOperand* target = LConstantOperand::cast(instr->target());
Handle<Code> code = Handle<Code>::cast(ToHandle(target));
generator.BeforeCall(__ CallSize(code, RelocInfo::CODE_TARGET));
__ Call(code, RelocInfo::CODE_TARGET);
} else {
DCHECK(instr->target()->IsRegister());
Register target = ToRegister(instr->target());
generator.BeforeCall(__ CallSize(target));
__ Daddu(target, target, Operand(Code::kHeaderSize - kHeapObjectTag));
__ Call(target);
}
generator.AfterCall();
}
}
void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->constructor()).is(a1));
DCHECK(ToRegister(instr->result()).is(v0));
__ li(a0, Operand(instr->arity()));
__ li(a2, instr->hydrogen()->site());
ElementsKind kind = instr->hydrogen()->elements_kind();
AllocationSiteOverrideMode override_mode =
(AllocationSite::GetMode(kind) == TRACK_ALLOCATION_SITE)
? DISABLE_ALLOCATION_SITES
: DONT_OVERRIDE;
if (instr->arity() == 0) {
ArrayNoArgumentConstructorStub stub(isolate(), kind, override_mode);
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
} else if (instr->arity() == 1) {
Label done;
if (IsFastPackedElementsKind(kind)) {
Label packed_case;
// We might need a change here,
// look at the first argument.
__ ld(a5, MemOperand(sp, 0));
__ Branch(&packed_case, eq, a5, Operand(zero_reg));
ElementsKind holey_kind = GetHoleyElementsKind(kind);
ArraySingleArgumentConstructorStub stub(isolate(),
holey_kind,
override_mode);
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
__ jmp(&done);
__ bind(&packed_case);
}
ArraySingleArgumentConstructorStub stub(isolate(), kind, override_mode);
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
__ bind(&done);
} else {
ArrayNArgumentsConstructorStub stub(isolate());
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
}
}
void LCodeGen::DoCallRuntime(LCallRuntime* instr) {
CallRuntime(instr->function(), instr->arity(), instr);
}
void LCodeGen::DoStoreCodeEntry(LStoreCodeEntry* instr) {
Register function = ToRegister(instr->function());
Register code_object = ToRegister(instr->code_object());
__ Daddu(code_object, code_object,
Operand(Code::kHeaderSize - kHeapObjectTag));
__ sd(code_object,
FieldMemOperand(function, JSFunction::kCodeEntryOffset));
}
void LCodeGen::DoInnerAllocatedObject(LInnerAllocatedObject* instr) {
Register result = ToRegister(instr->result());
Register base = ToRegister(instr->base_object());
if (instr->offset()->IsConstantOperand()) {
LConstantOperand* offset = LConstantOperand::cast(instr->offset());
__ Daddu(result, base, Operand(ToInteger32(offset)));
} else {
Register offset = ToRegister(instr->offset());
__ Daddu(result, base, offset);
}
}
void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
Representation representation = instr->representation();
Register object = ToRegister(instr->object());
Register scratch2 = scratch1();
Register scratch1 = scratch0();
HObjectAccess access = instr->hydrogen()->access();
int offset = access.offset();
if (access.IsExternalMemory()) {
Register value = ToRegister(instr->value());
MemOperand operand = MemOperand(object, offset);
__ Store(value, operand, representation);
return;
}
__ AssertNotSmi(object);
DCHECK(!representation.IsSmi() ||
!instr->value()->IsConstantOperand() ||
IsSmi(LConstantOperand::cast(instr->value())));
if (!FLAG_unbox_double_fields && representation.IsDouble()) {
DCHECK(access.IsInobject());
DCHECK(!instr->hydrogen()->has_transition());
DCHECK(!instr->hydrogen()->NeedsWriteBarrier());
DoubleRegister value = ToDoubleRegister(instr->value());
__ sdc1(value, FieldMemOperand(object, offset));
return;
}
if (instr->hydrogen()->has_transition()) {
Handle<Map> transition = instr->hydrogen()->transition_map();
AddDeprecationDependency(transition);
__ li(scratch1, Operand(transition));
__ sd(scratch1, FieldMemOperand(object, HeapObject::kMapOffset));
if (instr->hydrogen()->NeedsWriteBarrierForMap()) {
Register temp = ToRegister(instr->temp());
// Update the write barrier for the map field.
__ RecordWriteForMap(object,
scratch1,
temp,
GetRAState(),
kSaveFPRegs);
}
}
// Do the store.
Register destination = object;
if (!access.IsInobject()) {
destination = scratch1;
__ ld(destination, FieldMemOperand(object, JSObject::kPropertiesOffset));
}
if (representation.IsSmi() && SmiValuesAre32Bits() &&
instr->hydrogen()->value()->representation().IsInteger32()) {
DCHECK(instr->hydrogen()->store_mode() == STORE_TO_INITIALIZED_ENTRY);
if (FLAG_debug_code) {
__ Load(scratch2, FieldMemOperand(destination, offset), representation);
__ AssertSmi(scratch2);
}
// Store int value directly to upper half of the smi.
offset = SmiWordOffset(offset);
representation = Representation::Integer32();
}
MemOperand operand = FieldMemOperand(destination, offset);
if (FLAG_unbox_double_fields && representation.IsDouble()) {
DCHECK(access.IsInobject());
DoubleRegister value = ToDoubleRegister(instr->value());
__ sdc1(value, operand);
} else {
DCHECK(instr->value()->IsRegister());
Register value = ToRegister(instr->value());
__ Store(value, operand, representation);
}
if (instr->hydrogen()->NeedsWriteBarrier()) {
// Update the write barrier for the object for in-object properties.
Register value = ToRegister(instr->value());
__ RecordWriteField(destination,
offset,
value,
scratch2,
GetRAState(),
kSaveFPRegs,
EMIT_REMEMBERED_SET,
instr->hydrogen()->SmiCheckForWriteBarrier(),
instr->hydrogen()->PointersToHereCheckForValue());
}
}
void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
Condition cc = instr->hydrogen()->allow_equality() ? hi : hs;
Operand operand((int64_t)0);
Register reg;
if (instr->index()->IsConstantOperand()) {
operand = ToOperand(instr->index());
reg = ToRegister(instr->length());
cc = CommuteCondition(cc);
} else {
reg = ToRegister(instr->index());
operand = ToOperand(instr->length());
}
if (FLAG_debug_code && instr->hydrogen()->skip_check()) {
Label done;
__ Branch(&done, NegateCondition(cc), reg, operand);
__ stop("eliminated bounds check failed");
__ bind(&done);
} else {
DeoptimizeIf(cc, instr, DeoptimizeReason::kOutOfBounds, reg, operand);
}
}
void LCodeGen::DoStoreKeyedExternalArray(LStoreKeyed* instr) {
Register external_pointer = ToRegister(instr->elements());
Register key = no_reg;
ElementsKind elements_kind = instr->elements_kind();
bool key_is_constant = instr->key()->IsConstantOperand();
int constant_key = 0;
if (key_is_constant) {
constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
if (constant_key & 0xF0000000) {
Abort(kArrayIndexConstantValueTooBig);
}
} else {
key = ToRegister(instr->key());
}
int element_size_shift = ElementsKindToShiftSize(elements_kind);
int shift_size = (instr->hydrogen()->key()->representation().IsSmi())
? (element_size_shift - (kSmiTagSize + kSmiShiftSize))
: element_size_shift;
int base_offset = instr->base_offset();
if (elements_kind == FLOAT32_ELEMENTS || elements_kind == FLOAT64_ELEMENTS) {
Register address = scratch0();
FPURegister value(ToDoubleRegister(instr->value()));
if (key_is_constant) {
if (constant_key != 0) {
__ Daddu(address, external_pointer,
Operand(constant_key << element_size_shift));
} else {
address = external_pointer;
}
} else {
if (shift_size < 0) {
if (shift_size == -32) {
__ dsra32(address, key, 0);
} else {
__ dsra(address, key, -shift_size);
}
} else {
__ dsll(address, key, shift_size);
}
__ Daddu(address, external_pointer, address);
}
if (elements_kind == FLOAT32_ELEMENTS) {
__ cvt_s_d(double_scratch0(), value);
__ swc1(double_scratch0(), MemOperand(address, base_offset));
} else { // Storing doubles, not floats.
__ sdc1(value, MemOperand(address, base_offset));
}
} else {
Register value(ToRegister(instr->value()));
MemOperand mem_operand = PrepareKeyedOperand(
key, external_pointer, key_is_constant, constant_key,
element_size_shift, shift_size,
base_offset);
switch (elements_kind) {
case UINT8_ELEMENTS:
case UINT8_CLAMPED_ELEMENTS:
case INT8_ELEMENTS:
__ sb(value, mem_operand);
break;
case INT16_ELEMENTS:
case UINT16_ELEMENTS:
__ sh(value, mem_operand);
break;
case INT32_ELEMENTS:
case UINT32_ELEMENTS:
__ sw(value, mem_operand);
break;
case FLOAT32_ELEMENTS:
case FLOAT64_ELEMENTS:
case FAST_DOUBLE_ELEMENTS:
case FAST_ELEMENTS:
case FAST_SMI_ELEMENTS:
case FAST_HOLEY_DOUBLE_ELEMENTS:
case FAST_HOLEY_ELEMENTS:
case FAST_HOLEY_SMI_ELEMENTS:
case DICTIONARY_ELEMENTS:
case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
case FAST_STRING_WRAPPER_ELEMENTS:
case SLOW_STRING_WRAPPER_ELEMENTS:
case NO_ELEMENTS:
UNREACHABLE();
break;
}
}
}
void LCodeGen::DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr) {
DoubleRegister value = ToDoubleRegister(instr->value());
Register elements = ToRegister(instr->elements());
Register scratch = scratch0();
DoubleRegister double_scratch = double_scratch0();
bool key_is_constant = instr->key()->IsConstantOperand();
int base_offset = instr->base_offset();
Label not_nan, done;
// Calculate the effective address of the slot in the array to store the
// double value.
int element_size_shift = ElementsKindToShiftSize(FAST_DOUBLE_ELEMENTS);
if (key_is_constant) {
int constant_key = ToInteger32(LConstantOperand::cast(instr->key()));
if (constant_key & 0xF0000000) {
Abort(kArrayIndexConstantValueTooBig);
}
__ Daddu(scratch, elements,
Operand((constant_key << element_size_shift) + base_offset));
} else {
int shift_size = (instr->hydrogen()->key()->representation().IsSmi())
? (element_size_shift - (kSmiTagSize + kSmiShiftSize))
: element_size_shift;
__ Daddu(scratch, elements, Operand(base_offset));
DCHECK((shift_size == 3) || (shift_size == -29));
if (shift_size == 3) {
__ dsll(at, ToRegister(instr->key()), 3);
} else if (shift_size == -29) {
__ dsra(at, ToRegister(instr->key()), 29);
}
__ Daddu(scratch, scratch, at);
}
if (instr->NeedsCanonicalization()) {
__ FPUCanonicalizeNaN(double_scratch, value);
__ sdc1(double_scratch, MemOperand(scratch, 0));
} else {
__ sdc1(value, MemOperand(scratch, 0));
}
}
void LCodeGen::DoStoreKeyedFixedArray(LStoreKeyed* instr) {
Register value = ToRegister(instr->value());
Register elements = ToRegister(instr->elements());
Register key = instr->key()->IsRegister() ? ToRegister(instr->key())
: no_reg;
Register scratch = scratch0();
Register store_base = scratch;
int offset = instr->base_offset();
// Do the store.
if (instr->key()->IsConstantOperand()) {
DCHECK(!instr->hydrogen()->NeedsWriteBarrier());
LConstantOperand* const_operand = LConstantOperand::cast(instr->key());
offset += ToInteger32(const_operand) * kPointerSize;
store_base = elements;
} else {
// Even though the HLoadKeyed instruction forces the input
// representation for the key to be an integer, the input gets replaced
// during bound check elimination with the index argument to the bounds
// check, which can be tagged, so that case must be handled here, too.
if (instr->hydrogen()->key()->representation().IsSmi()) {
__ SmiScale(scratch, key, kPointerSizeLog2);
__ daddu(store_base, elements, scratch);
} else {
__ Dlsa(store_base, elements, key, kPointerSizeLog2);
}
}
Representation representation = instr->hydrogen()->value()->representation();
if (representation.IsInteger32() && SmiValuesAre32Bits()) {
DCHECK(instr->hydrogen()->store_mode() == STORE_TO_INITIALIZED_ENTRY);
DCHECK(instr->hydrogen()->elements_kind() == FAST_SMI_ELEMENTS);
if (FLAG_debug_code) {
Register temp = scratch1();
__ Load(temp, MemOperand(store_base, offset), Representation::Smi());
__ AssertSmi(temp);
}
// Store int value directly to upper half of the smi.
STATIC_ASSERT(kSmiTag == 0);
STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 32);
offset = SmiWordOffset(offset);
representation = Representation::Integer32();
}
__ Store(value, MemOperand(store_base, offset), representation);
if (instr->hydrogen()->NeedsWriteBarrier()) {
SmiCheck check_needed =
instr->hydrogen()->value()->type().IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
// Compute address of modified element and store it into key register.
__ Daddu(key, store_base, Operand(offset));
__ RecordWrite(elements,
key,
value,
GetRAState(),
kSaveFPRegs,
EMIT_REMEMBERED_SET,
check_needed,
instr->hydrogen()->PointersToHereCheckForValue());
}
}
void LCodeGen::DoStoreKeyed(LStoreKeyed* instr) {
// By cases: external, fast double
if (instr->is_fixed_typed_array()) {
DoStoreKeyedExternalArray(instr);
} else if (instr->hydrogen()->value()->representation().IsDouble()) {
DoStoreKeyedFixedDoubleArray(instr);
} else {
DoStoreKeyedFixedArray(instr);
}
}
void LCodeGen::DoMaybeGrowElements(LMaybeGrowElements* instr) {
class DeferredMaybeGrowElements final : public LDeferredCode {
public:
DeferredMaybeGrowElements(LCodeGen* codegen, LMaybeGrowElements* instr)
: LDeferredCode(codegen), instr_(instr) {}
void Generate() override { codegen()->DoDeferredMaybeGrowElements(instr_); }
LInstruction* instr() override { return instr_; }
private:
LMaybeGrowElements* instr_;
};
Register result = v0;
DeferredMaybeGrowElements* deferred =
new (zone()) DeferredMaybeGrowElements(this, instr);
LOperand* key = instr->key();
LOperand* current_capacity = instr->current_capacity();
DCHECK(instr->hydrogen()->key()->representation().IsInteger32());
DCHECK(instr->hydrogen()->current_capacity()->representation().IsInteger32());
DCHECK(key->IsConstantOperand() || key->IsRegister());
DCHECK(current_capacity->IsConstantOperand() ||
current_capacity->IsRegister());
if (key->IsConstantOperand() && current_capacity->IsConstantOperand()) {
int32_t constant_key = ToInteger32(LConstantOperand::cast(key));
int32_t constant_capacity =
ToInteger32(LConstantOperand::cast(current_capacity));
if (constant_key >= constant_capacity) {
// Deferred case.
__ jmp(deferred->entry());
}
} else if (key->IsConstantOperand()) {
int32_t constant_key = ToInteger32(LConstantOperand::cast(key));
__ Branch(deferred->entry(), le, ToRegister(current_capacity),
Operand(constant_key));
} else if (current_capacity->IsConstantOperand()) {
int32_t constant_capacity =
ToInteger32(LConstantOperand::cast(current_capacity));
__ Branch(deferred->entry(), ge, ToRegister(key),
Operand(constant_capacity));
} else {
__ Branch(deferred->entry(), ge, ToRegister(key),
Operand(ToRegister(current_capacity)));
}
if (instr->elements()->IsRegister()) {
__ mov(result, ToRegister(instr->elements()));
} else {
__ ld(result, ToMemOperand(instr->elements()));
}
__ bind(deferred->exit());
}
void LCodeGen::DoDeferredMaybeGrowElements(LMaybeGrowElements* instr) {
// TODO(3095996): Get rid of this. For now, we need to make the
// result register contain a valid pointer because it is already
// contained in the register pointer map.
Register result = v0;
__ mov(result, zero_reg);
// We have to call a stub.
{
PushSafepointRegistersScope scope(this);
if (instr->object()->IsRegister()) {
__ mov(result, ToRegister(instr->object()));
} else {
__ ld(result, ToMemOperand(instr->object()));
}
LOperand* key = instr->key();
if (key->IsConstantOperand()) {
__ li(a3, Operand(ToSmi(LConstantOperand::cast(key))));
} else {
__ mov(a3, ToRegister(key));
__ SmiTag(a3);
}
GrowArrayElementsStub stub(isolate(), instr->hydrogen()->kind());
__ mov(a0, result);
__ CallStub(&stub);
RecordSafepointWithLazyDeopt(
instr, RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
__ StoreToSafepointRegisterSlot(result, result);
}
// Deopt on smi, which means the elements array changed to dictionary mode.
__ SmiTst(result, at);
DeoptimizeIf(eq, instr, DeoptimizeReason::kSmi, at, Operand(zero_reg));
}
void LCodeGen::DoTransitionElementsKind(LTransitionElementsKind* instr) {
Register object_reg = ToRegister(instr->object());
Register scratch = scratch0();
Handle<Map> from_map = instr->original_map();
Handle<Map> to_map = instr->transitioned_map();
ElementsKind from_kind = instr->from_kind();
ElementsKind to_kind = instr->to_kind();
Label not_applicable;
__ ld(scratch, FieldMemOperand(object_reg, HeapObject::kMapOffset));
__ Branch(¬_applicable, ne, scratch, Operand(from_map));
if (IsSimpleMapChangeTransition(from_kind, to_kind)) {
Register new_map_reg = ToRegister(instr->new_map_temp());
__ li(new_map_reg, Operand(to_map));
__ sd(new_map_reg, FieldMemOperand(object_reg, HeapObject::kMapOffset));
// Write barrier.
__ RecordWriteForMap(object_reg,
new_map_reg,
scratch,
GetRAState(),
kDontSaveFPRegs);
} else {
DCHECK(object_reg.is(a0));
DCHECK(ToRegister(instr->context()).is(cp));
PushSafepointRegistersScope scope(this);
__ li(a1, Operand(to_map));
TransitionElementsKindStub stub(isolate(), from_kind, to_kind);
__ CallStub(&stub);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kLazyDeopt);
}
__ bind(¬_applicable);
}
void LCodeGen::DoTrapAllocationMemento(LTrapAllocationMemento* instr) {
Register object = ToRegister(instr->object());
Register temp = ToRegister(instr->temp());
Label no_memento_found;
__ TestJSArrayForAllocationMemento(object, temp, &no_memento_found);
DeoptimizeIf(al, instr, DeoptimizeReason::kMementoFound);
__ bind(&no_memento_found);
}
void LCodeGen::DoStringAdd(LStringAdd* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->left()).is(a1));
DCHECK(ToRegister(instr->right()).is(a0));
StringAddStub stub(isolate(),
instr->hydrogen()->flags(),
instr->hydrogen()->pretenure_flag());
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
}
void LCodeGen::DoStringCharCodeAt(LStringCharCodeAt* instr) {
class DeferredStringCharCodeAt final : public LDeferredCode {
public:
DeferredStringCharCodeAt(LCodeGen* codegen, LStringCharCodeAt* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override { codegen()->DoDeferredStringCharCodeAt(instr_); }
LInstruction* instr() override { return instr_; }
private:
LStringCharCodeAt* instr_;
};
DeferredStringCharCodeAt* deferred =
new(zone()) DeferredStringCharCodeAt(this, instr);
StringCharLoadGenerator::Generate(masm(),
ToRegister(instr->string()),
ToRegister(instr->index()),
ToRegister(instr->result()),
deferred->entry());
__ bind(deferred->exit());
}
void LCodeGen::DoDeferredStringCharCodeAt(LStringCharCodeAt* instr) {
Register string = ToRegister(instr->string());
Register result = ToRegister(instr->result());
Register scratch = scratch0();
// TODO(3095996): Get rid of this. For now, we need to make the
// result register contain a valid pointer because it is already
// contained in the register pointer map.
__ mov(result, zero_reg);
PushSafepointRegistersScope scope(this);
__ push(string);
// Push the index as a smi. This is safe because of the checks in
// DoStringCharCodeAt above.
if (instr->index()->IsConstantOperand()) {
int const_index = ToInteger32(LConstantOperand::cast(instr->index()));
__ Daddu(scratch, zero_reg, Operand(Smi::FromInt(const_index)));
__ push(scratch);
} else {
Register index = ToRegister(instr->index());
__ SmiTag(index);
__ push(index);
}
CallRuntimeFromDeferred(Runtime::kStringCharCodeAtRT, 2, instr,
instr->context());
__ AssertSmi(v0);
__ SmiUntag(v0);
__ StoreToSafepointRegisterSlot(v0, result);
}
void LCodeGen::DoStringCharFromCode(LStringCharFromCode* instr) {
class DeferredStringCharFromCode final : public LDeferredCode {
public:
DeferredStringCharFromCode(LCodeGen* codegen, LStringCharFromCode* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override {
codegen()->DoDeferredStringCharFromCode(instr_);
}
LInstruction* instr() override { return instr_; }
private:
LStringCharFromCode* instr_;
};
DeferredStringCharFromCode* deferred =
new(zone()) DeferredStringCharFromCode(this, instr);
DCHECK(instr->hydrogen()->value()->representation().IsInteger32());
Register char_code = ToRegister(instr->char_code());
Register result = ToRegister(instr->result());
Register scratch = scratch0();
DCHECK(!char_code.is(result));
__ Branch(deferred->entry(), hi,
char_code, Operand(String::kMaxOneByteCharCode));
__ LoadRoot(result, Heap::kSingleCharacterStringCacheRootIndex);
__ Dlsa(result, result, char_code, kPointerSizeLog2);
__ ld(result, FieldMemOperand(result, FixedArray::kHeaderSize));
__ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
__ Branch(deferred->entry(), eq, result, Operand(scratch));
__ bind(deferred->exit());
}
void LCodeGen::DoDeferredStringCharFromCode(LStringCharFromCode* instr) {
Register char_code = ToRegister(instr->char_code());
Register result = ToRegister(instr->result());
// TODO(3095996): Get rid of this. For now, we need to make the
// result register contain a valid pointer because it is already
// contained in the register pointer map.
__ mov(result, zero_reg);
PushSafepointRegistersScope scope(this);
__ SmiTag(char_code);
__ push(char_code);
CallRuntimeFromDeferred(Runtime::kStringCharFromCode, 1, instr,
instr->context());
__ StoreToSafepointRegisterSlot(v0, result);
}
void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
LOperand* input = instr->value();
DCHECK(input->IsRegister() || input->IsStackSlot());
LOperand* output = instr->result();
DCHECK(output->IsDoubleRegister());
FPURegister single_scratch = double_scratch0().low();
if (input->IsStackSlot()) {
Register scratch = scratch0();
__ ld(scratch, ToMemOperand(input));
__ mtc1(scratch, single_scratch);
} else {
__ mtc1(ToRegister(input), single_scratch);
}
__ cvt_d_w(ToDoubleRegister(output), single_scratch);
}
void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
LOperand* input = instr->value();
LOperand* output = instr->result();
FPURegister dbl_scratch = double_scratch0();
__ mtc1(ToRegister(input), dbl_scratch);
__ Cvt_d_uw(ToDoubleRegister(output), dbl_scratch);
}
void LCodeGen::DoNumberTagU(LNumberTagU* instr) {
class DeferredNumberTagU final : public LDeferredCode {
public:
DeferredNumberTagU(LCodeGen* codegen, LNumberTagU* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override {
codegen()->DoDeferredNumberTagIU(instr_,
instr_->value(),
instr_->temp1(),
instr_->temp2(),
UNSIGNED_INT32);
}
LInstruction* instr() override { return instr_; }
private:
LNumberTagU* instr_;
};
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
DeferredNumberTagU* deferred = new(zone()) DeferredNumberTagU(this, instr);
__ Branch(deferred->entry(), hi, input, Operand(Smi::kMaxValue));
__ SmiTag(result, input);
__ bind(deferred->exit());
}
void LCodeGen::DoDeferredNumberTagIU(LInstruction* instr,
LOperand* value,
LOperand* temp1,
LOperand* temp2,
IntegerSignedness signedness) {
Label done, slow;
Register src = ToRegister(value);
Register dst = ToRegister(instr->result());
Register tmp1 = scratch0();
Register tmp2 = ToRegister(temp1);
Register tmp3 = ToRegister(temp2);
DoubleRegister dbl_scratch = double_scratch0();
if (signedness == SIGNED_INT32) {
// There was overflow, so bits 30 and 31 of the original integer
// disagree. Try to allocate a heap number in new space and store
// the value in there. If that fails, call the runtime system.
if (dst.is(src)) {
__ SmiUntag(src, dst);
__ Xor(src, src, Operand(0x80000000));
}
__ mtc1(src, dbl_scratch);
__ cvt_d_w(dbl_scratch, dbl_scratch);
} else {
__ mtc1(src, dbl_scratch);
__ Cvt_d_uw(dbl_scratch, dbl_scratch);
}
if (FLAG_inline_new) {
__ LoadRoot(tmp3, Heap::kHeapNumberMapRootIndex);
__ AllocateHeapNumber(dst, tmp1, tmp2, tmp3, &slow);
__ Branch(&done);
}
// Slow case: Call the runtime system to do the number allocation.
__ bind(&slow);
{
// TODO(3095996): Put a valid pointer value in the stack slot where the
// result register is stored, as this register is in the pointer map, but
// contains an integer value.
__ mov(dst, zero_reg);
// Preserve the value of all registers.
PushSafepointRegistersScope scope(this);
// Reset the context register.
if (!dst.is(cp)) {
__ mov(cp, zero_reg);
}
__ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
__ StoreToSafepointRegisterSlot(v0, dst);
}
// Done. Put the value in dbl_scratch into the value of the allocated heap
// number.
__ bind(&done);
__ sdc1(dbl_scratch, FieldMemOperand(dst, HeapNumber::kValueOffset));
}
void LCodeGen::DoNumberTagD(LNumberTagD* instr) {
class DeferredNumberTagD final : public LDeferredCode {
public:
DeferredNumberTagD(LCodeGen* codegen, LNumberTagD* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override { codegen()->DoDeferredNumberTagD(instr_); }
LInstruction* instr() override { return instr_; }
private:
LNumberTagD* instr_;
};
DoubleRegister input_reg = ToDoubleRegister(instr->value());
Register scratch = scratch0();
Register reg = ToRegister(instr->result());
Register temp1 = ToRegister(instr->temp());
Register temp2 = ToRegister(instr->temp2());
DeferredNumberTagD* deferred = new(zone()) DeferredNumberTagD(this, instr);
if (FLAG_inline_new) {
__ LoadRoot(scratch, Heap::kHeapNumberMapRootIndex);
// We want the untagged address first for performance
__ AllocateHeapNumber(reg, temp1, temp2, scratch, deferred->entry());
} else {
__ Branch(deferred->entry());
}
__ bind(deferred->exit());
__ sdc1(input_reg, FieldMemOperand(reg, HeapNumber::kValueOffset));
}
void LCodeGen::DoDeferredNumberTagD(LNumberTagD* instr) {
// TODO(3095996): Get rid of this. For now, we need to make the
// result register contain a valid pointer because it is already
// contained in the register pointer map.
Register reg = ToRegister(instr->result());
__ mov(reg, zero_reg);
PushSafepointRegistersScope scope(this);
// Reset the context register.
if (!reg.is(cp)) {
__ mov(cp, zero_reg);
}
__ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
__ StoreToSafepointRegisterSlot(v0, reg);
}
void LCodeGen::DoSmiTag(LSmiTag* instr) {
HChange* hchange = instr->hydrogen();
Register input = ToRegister(instr->value());
Register output = ToRegister(instr->result());
if (hchange->CheckFlag(HValue::kCanOverflow) &&
hchange->value()->CheckFlag(HValue::kUint32)) {
__ And(at, input, Operand(0x80000000));
DeoptimizeIf(ne, instr, DeoptimizeReason::kOverflow, at, Operand(zero_reg));
}
if (hchange->CheckFlag(HValue::kCanOverflow) &&
!hchange->value()->CheckFlag(HValue::kUint32)) {
__ SmiTagCheckOverflow(output, input, at);
DeoptimizeIf(lt, instr, DeoptimizeReason::kOverflow, at, Operand(zero_reg));
} else {
__ SmiTag(output, input);
}
}
void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
Register scratch = scratch0();
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
if (instr->needs_check()) {
STATIC_ASSERT(kHeapObjectTag == 1);
// If the input is a HeapObject, value of scratch won't be zero.
__ And(scratch, input, Operand(kHeapObjectTag));
__ SmiUntag(result, input);
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotASmi, scratch,
Operand(zero_reg));
} else {
__ SmiUntag(result, input);
}
}
void LCodeGen::EmitNumberUntagD(LNumberUntagD* instr, Register input_reg,
DoubleRegister result_reg,
NumberUntagDMode mode) {
bool can_convert_undefined_to_nan = instr->truncating();
bool deoptimize_on_minus_zero = instr->hydrogen()->deoptimize_on_minus_zero();
Register scratch = scratch0();
Label convert, load_smi, done;
if (mode == NUMBER_CANDIDATE_IS_ANY_TAGGED) {
// Smi check.
__ UntagAndJumpIfSmi(scratch, input_reg, &load_smi);
// Heap number map check.
__ ld(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
if (can_convert_undefined_to_nan) {
__ Branch(&convert, ne, scratch, Operand(at));
} else {
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotAHeapNumber, scratch,
Operand(at));
}
// Load heap number.
__ ldc1(result_reg, FieldMemOperand(input_reg, HeapNumber::kValueOffset));
if (deoptimize_on_minus_zero) {
__ mfc1(at, result_reg);
__ Branch(&done, ne, at, Operand(zero_reg));
__ mfhc1(scratch, result_reg); // Get exponent/sign bits.
DeoptimizeIf(eq, instr, DeoptimizeReason::kMinusZero, scratch,
Operand(HeapNumber::kSignMask));
}
__ Branch(&done);
if (can_convert_undefined_to_nan) {
__ bind(&convert);
// Convert undefined (and hole) to NaN.
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotAHeapNumberUndefined,
input_reg, Operand(at));
__ LoadRoot(scratch, Heap::kNanValueRootIndex);
__ ldc1(result_reg, FieldMemOperand(scratch, HeapNumber::kValueOffset));
__ Branch(&done);
}
} else {
__ SmiUntag(scratch, input_reg);
DCHECK(mode == NUMBER_CANDIDATE_IS_SMI);
}
// Smi to double register conversion
__ bind(&load_smi);
// scratch: untagged value of input_reg
__ mtc1(scratch, result_reg);
__ cvt_d_w(result_reg, result_reg);
__ bind(&done);
}
void LCodeGen::DoDeferredTaggedToI(LTaggedToI* instr) {
Register input_reg = ToRegister(instr->value());
Register scratch1 = scratch0();
Register scratch2 = ToRegister(instr->temp());
DoubleRegister double_scratch = double_scratch0();
DoubleRegister double_scratch2 = ToDoubleRegister(instr->temp2());
DCHECK(!scratch1.is(input_reg) && !scratch1.is(scratch2));
DCHECK(!scratch2.is(input_reg) && !scratch2.is(scratch1));
Label done;
// The input is a tagged HeapObject.
// Heap number map check.
__ ld(scratch1, FieldMemOperand(input_reg, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
// This 'at' value and scratch1 map value are used for tests in both clauses
// of the if.
if (instr->truncating()) {
Label truncate;
__ Branch(USE_DELAY_SLOT, &truncate, eq, scratch1, Operand(at));
__ mov(scratch2, input_reg); // In delay slot.
__ lbu(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset));
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotANumberOrOddball, scratch1,
Operand(ODDBALL_TYPE));
__ bind(&truncate);
__ TruncateHeapNumberToI(input_reg, scratch2);
} else {
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotAHeapNumber, scratch1,
Operand(at));
// Load the double value.
__ ldc1(double_scratch,
FieldMemOperand(input_reg, HeapNumber::kValueOffset));
Register except_flag = scratch2;
__ EmitFPUTruncate(kRoundToZero,
input_reg,
double_scratch,
scratch1,
double_scratch2,
except_flag,
kCheckForInexactConversion);
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecisionOrNaN, except_flag,
Operand(zero_reg));
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
__ Branch(&done, ne, input_reg, Operand(zero_reg));
__ mfhc1(scratch1, double_scratch); // Get exponent/sign bits.
__ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, DeoptimizeReason::kMinusZero, scratch1,
Operand(zero_reg));
}
}
__ bind(&done);
}
void LCodeGen::DoTaggedToI(LTaggedToI* instr) {
class DeferredTaggedToI final : public LDeferredCode {
public:
DeferredTaggedToI(LCodeGen* codegen, LTaggedToI* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override { codegen()->DoDeferredTaggedToI(instr_); }
LInstruction* instr() override { return instr_; }
private:
LTaggedToI* instr_;
};
LOperand* input = instr->value();
DCHECK(input->IsRegister());
DCHECK(input->Equals(instr->result()));
Register input_reg = ToRegister(input);
if (instr->hydrogen()->value()->representation().IsSmi()) {
__ SmiUntag(input_reg);
} else {
DeferredTaggedToI* deferred = new(zone()) DeferredTaggedToI(this, instr);
// Let the deferred code handle the HeapObject case.
__ JumpIfNotSmi(input_reg, deferred->entry());
// Smi to int32 conversion.
__ SmiUntag(input_reg);
__ bind(deferred->exit());
}
}
void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
LOperand* input = instr->value();
DCHECK(input->IsRegister());
LOperand* result = instr->result();
DCHECK(result->IsDoubleRegister());
Register input_reg = ToRegister(input);
DoubleRegister result_reg = ToDoubleRegister(result);
HValue* value = instr->hydrogen()->value();
NumberUntagDMode mode = value->representation().IsSmi()
? NUMBER_CANDIDATE_IS_SMI : NUMBER_CANDIDATE_IS_ANY_TAGGED;
EmitNumberUntagD(instr, input_reg, result_reg, mode);
}
void LCodeGen::DoDoubleToI(LDoubleToI* instr) {
Register result_reg = ToRegister(instr->result());
Register scratch1 = scratch0();
DoubleRegister double_input = ToDoubleRegister(instr->value());
if (instr->truncating()) {
__ TruncateDoubleToI(result_reg, double_input);
} else {
Register except_flag = LCodeGen::scratch1();
__ EmitFPUTruncate(kRoundToMinusInf,
result_reg,
double_input,
scratch1,
double_scratch0(),
except_flag,
kCheckForInexactConversion);
// Deopt if the operation did not succeed (except_flag != 0).
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecisionOrNaN, except_flag,
Operand(zero_reg));
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label done;
__ Branch(&done, ne, result_reg, Operand(zero_reg));
__ mfhc1(scratch1, double_input); // Get exponent/sign bits.
__ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, DeoptimizeReason::kMinusZero, scratch1,
Operand(zero_reg));
__ bind(&done);
}
}
}
void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
Register result_reg = ToRegister(instr->result());
Register scratch1 = LCodeGen::scratch0();
DoubleRegister double_input = ToDoubleRegister(instr->value());
if (instr->truncating()) {
__ TruncateDoubleToI(result_reg, double_input);
} else {
Register except_flag = LCodeGen::scratch1();
__ EmitFPUTruncate(kRoundToMinusInf,
result_reg,
double_input,
scratch1,
double_scratch0(),
except_flag,
kCheckForInexactConversion);
// Deopt if the operation did not succeed (except_flag != 0).
DeoptimizeIf(ne, instr, DeoptimizeReason::kLostPrecisionOrNaN, except_flag,
Operand(zero_reg));
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label done;
__ Branch(&done, ne, result_reg, Operand(zero_reg));
__ mfhc1(scratch1, double_input); // Get exponent/sign bits.
__ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, DeoptimizeReason::kMinusZero, scratch1,
Operand(zero_reg));
__ bind(&done);
}
}
__ SmiTag(result_reg, result_reg);
}
void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
LOperand* input = instr->value();
__ SmiTst(ToRegister(input), at);
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotASmi, at, Operand(zero_reg));
}
void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
if (!instr->hydrogen()->value()->type().IsHeapObject()) {
LOperand* input = instr->value();
__ SmiTst(ToRegister(input), at);
DeoptimizeIf(eq, instr, DeoptimizeReason::kSmi, at, Operand(zero_reg));
}
}
void LCodeGen::DoCheckArrayBufferNotNeutered(
LCheckArrayBufferNotNeutered* instr) {
Register view = ToRegister(instr->view());
Register scratch = scratch0();
__ ld(scratch, FieldMemOperand(view, JSArrayBufferView::kBufferOffset));
__ lw(scratch, FieldMemOperand(scratch, JSArrayBuffer::kBitFieldOffset));
__ And(at, scratch, 1 << JSArrayBuffer::WasNeutered::kShift);
DeoptimizeIf(ne, instr, DeoptimizeReason::kOutOfBounds, at,
Operand(zero_reg));
}
void LCodeGen::DoCheckInstanceType(LCheckInstanceType* instr) {
Register input = ToRegister(instr->value());
Register scratch = scratch0();
__ GetObjectType(input, scratch, scratch);
if (instr->hydrogen()->is_interval_check()) {
InstanceType first;
InstanceType last;
instr->hydrogen()->GetCheckInterval(&first, &last);
// If there is only one type in the interval check for equality.
if (first == last) {
DeoptimizeIf(ne, instr, DeoptimizeReason::kWrongInstanceType, scratch,
Operand(first));
} else {
DeoptimizeIf(lo, instr, DeoptimizeReason::kWrongInstanceType, scratch,
Operand(first));
// Omit check for the last type.
if (last != LAST_TYPE) {
DeoptimizeIf(hi, instr, DeoptimizeReason::kWrongInstanceType, scratch,
Operand(last));
}
}
} else {
uint8_t mask;
uint8_t tag;
instr->hydrogen()->GetCheckMaskAndTag(&mask, &tag);
if (base::bits::IsPowerOfTwo32(mask)) {
DCHECK(tag == 0 || base::bits::IsPowerOfTwo32(tag));
__ And(at, scratch, mask);
DeoptimizeIf(tag == 0 ? ne : eq, instr,
DeoptimizeReason::kWrongInstanceType, at, Operand(zero_reg));
} else {
__ And(scratch, scratch, Operand(mask));
DeoptimizeIf(ne, instr, DeoptimizeReason::kWrongInstanceType, scratch,
Operand(tag));
}
}
}
void LCodeGen::DoCheckValue(LCheckValue* instr) {
Register reg = ToRegister(instr->value());
Handle<HeapObject> object = instr->hydrogen()->object().handle();
AllowDeferredHandleDereference smi_check;
if (isolate()->heap()->InNewSpace(*object)) {
Register reg = ToRegister(instr->value());
Handle<Cell> cell = isolate()->factory()->NewCell(object);
__ li(at, Operand(cell));
__ ld(at, FieldMemOperand(at, Cell::kValueOffset));
DeoptimizeIf(ne, instr, DeoptimizeReason::kValueMismatch, reg, Operand(at));
} else {
DeoptimizeIf(ne, instr, DeoptimizeReason::kValueMismatch, reg,
Operand(object));
}
}
void LCodeGen::DoDeferredInstanceMigration(LCheckMaps* instr, Register object) {
Label deopt, done;
// If the map is not deprecated the migration attempt does not make sense.
__ ld(scratch0(), FieldMemOperand(object, HeapObject::kMapOffset));
__ lwu(scratch0(), FieldMemOperand(scratch0(), Map::kBitField3Offset));
__ And(at, scratch0(), Operand(Map::Deprecated::kMask));
__ Branch(&deopt, eq, at, Operand(zero_reg));
{
PushSafepointRegistersScope scope(this);
__ push(object);
__ mov(cp, zero_reg);
__ CallRuntimeSaveDoubles(Runtime::kTryMigrateInstance);
RecordSafepointWithRegisters(
instr->pointer_map(), 1, Safepoint::kNoLazyDeopt);
__ StoreToSafepointRegisterSlot(v0, scratch0());
}
__ SmiTst(scratch0(), at);
__ Branch(&done, ne, at, Operand(zero_reg));
__ bind(&deopt);
// In case of "al" condition the operands are not used so just pass zero_reg
// there.
DeoptimizeIf(al, instr, DeoptimizeReason::kInstanceMigrationFailed, zero_reg,
Operand(zero_reg));
__ bind(&done);
}
void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
class DeferredCheckMaps final : public LDeferredCode {
public:
DeferredCheckMaps(LCodeGen* codegen, LCheckMaps* instr, Register object)
: LDeferredCode(codegen), instr_(instr), object_(object) {
SetExit(check_maps());
}
void Generate() override {
codegen()->DoDeferredInstanceMigration(instr_, object_);
}
Label* check_maps() { return &check_maps_; }
LInstruction* instr() override { return instr_; }
private:
LCheckMaps* instr_;
Label check_maps_;
Register object_;
};
if (instr->hydrogen()->IsStabilityCheck()) {
const UniqueSet<Map>* maps = instr->hydrogen()->maps();
for (int i = 0; i < maps->size(); ++i) {
AddStabilityDependency(maps->at(i).handle());
}
return;
}
Register map_reg = scratch0();
LOperand* input = instr->value();
DCHECK(input->IsRegister());
Register reg = ToRegister(input);
__ ld(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
DeferredCheckMaps* deferred = NULL;
if (instr->hydrogen()->HasMigrationTarget()) {
deferred = new(zone()) DeferredCheckMaps(this, instr, reg);
__ bind(deferred->check_maps());
}
const UniqueSet<Map>* maps = instr->hydrogen()->maps();
Label success;
for (int i = 0; i < maps->size() - 1; i++) {
Handle<Map> map = maps->at(i).handle();
__ CompareMapAndBranch(map_reg, map, &success, eq, &success);
}
Handle<Map> map = maps->at(maps->size() - 1).handle();
// Do the CompareMap() directly within the Branch() and DeoptimizeIf().
if (instr->hydrogen()->HasMigrationTarget()) {
__ Branch(deferred->entry(), ne, map_reg, Operand(map));
} else {
DeoptimizeIf(ne, instr, DeoptimizeReason::kWrongMap, map_reg, Operand(map));
}
__ bind(&success);
}
void LCodeGen::DoClampDToUint8(LClampDToUint8* instr) {
DoubleRegister value_reg = ToDoubleRegister(instr->unclamped());
Register result_reg = ToRegister(instr->result());
DoubleRegister temp_reg = ToDoubleRegister(instr->temp());
__ ClampDoubleToUint8(result_reg, value_reg, temp_reg);
}
void LCodeGen::DoClampIToUint8(LClampIToUint8* instr) {
Register unclamped_reg = ToRegister(instr->unclamped());
Register result_reg = ToRegister(instr->result());
__ ClampUint8(result_reg, unclamped_reg);
}
void LCodeGen::DoClampTToUint8(LClampTToUint8* instr) {
Register scratch = scratch0();
Register input_reg = ToRegister(instr->unclamped());
Register result_reg = ToRegister(instr->result());
DoubleRegister temp_reg = ToDoubleRegister(instr->temp());
Label is_smi, done, heap_number;
// Both smi and heap number cases are handled.
__ UntagAndJumpIfSmi(scratch, input_reg, &is_smi);
// Check for heap number
__ ld(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
__ Branch(&heap_number, eq, scratch, Operand(factory()->heap_number_map()));
// Check for undefined. Undefined is converted to zero for clamping
// conversions.
DeoptimizeIf(ne, instr, DeoptimizeReason::kNotAHeapNumberUndefined, input_reg,
Operand(factory()->undefined_value()));
__ mov(result_reg, zero_reg);
__ jmp(&done);
// Heap number
__ bind(&heap_number);
__ ldc1(double_scratch0(), FieldMemOperand(input_reg,
HeapNumber::kValueOffset));
__ ClampDoubleToUint8(result_reg, double_scratch0(), temp_reg);
__ jmp(&done);
__ bind(&is_smi);
__ ClampUint8(result_reg, scratch);
__ bind(&done);
}
void LCodeGen::DoAllocate(LAllocate* instr) {
class DeferredAllocate final : public LDeferredCode {
public:
DeferredAllocate(LCodeGen* codegen, LAllocate* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override { codegen()->DoDeferredAllocate(instr_); }
LInstruction* instr() override { return instr_; }
private:
LAllocate* instr_;
};
DeferredAllocate* deferred =
new(zone()) DeferredAllocate(this, instr);
Register result = ToRegister(instr->result());
Register scratch = ToRegister(instr->temp1());
Register scratch2 = ToRegister(instr->temp2());
// Allocate memory for the object.
AllocationFlags flags = NO_ALLOCATION_FLAGS;
if (instr->hydrogen()->MustAllocateDoubleAligned()) {
flags = static_cast<AllocationFlags>(flags | DOUBLE_ALIGNMENT);
}
if (instr->hydrogen()->IsOldSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
flags = static_cast<AllocationFlags>(flags | PRETENURE);
}
if (instr->hydrogen()->IsAllocationFoldingDominator()) {
flags = static_cast<AllocationFlags>(flags | ALLOCATION_FOLDING_DOMINATOR);
}
DCHECK(!instr->hydrogen()->IsAllocationFolded());
if (instr->size()->IsConstantOperand()) {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
CHECK(size <= kMaxRegularHeapObjectSize);
__ Allocate(size, result, scratch, scratch2, deferred->entry(), flags);
} else {
Register size = ToRegister(instr->size());
__ Allocate(size, result, scratch, scratch2, deferred->entry(), flags);
}
__ bind(deferred->exit());
if (instr->hydrogen()->MustPrefillWithFiller()) {
STATIC_ASSERT(kHeapObjectTag == 1);
if (instr->size()->IsConstantOperand()) {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
__ li(scratch, Operand(size - kHeapObjectTag));
} else {
__ Dsubu(scratch, ToRegister(instr->size()), Operand(kHeapObjectTag));
}
__ li(scratch2, Operand(isolate()->factory()->one_pointer_filler_map()));
Label loop;
__ bind(&loop);
__ Dsubu(scratch, scratch, Operand(kPointerSize));
__ Daddu(at, result, Operand(scratch));
__ sd(scratch2, MemOperand(at));
__ Branch(&loop, ge, scratch, Operand(zero_reg));
}
}
void LCodeGen::DoDeferredAllocate(LAllocate* instr) {
Register result = ToRegister(instr->result());
// TODO(3095996): Get rid of this. For now, we need to make the
// result register contain a valid pointer because it is already
// contained in the register pointer map.
__ mov(result, zero_reg);
PushSafepointRegistersScope scope(this);
if (instr->size()->IsRegister()) {
Register size = ToRegister(instr->size());
DCHECK(!size.is(result));
__ SmiTag(size);
__ push(size);
} else {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
if (size >= 0 && size <= Smi::kMaxValue) {
__ li(v0, Operand(Smi::FromInt(size)));
__ Push(v0);
} else {
// We should never get here at runtime => abort
__ stop("invalid allocation size");
return;
}
}
int flags = AllocateDoubleAlignFlag::encode(
instr->hydrogen()->MustAllocateDoubleAligned());
if (instr->hydrogen()->IsOldSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
flags = AllocateTargetSpace::update(flags, OLD_SPACE);
} else {
flags = AllocateTargetSpace::update(flags, NEW_SPACE);
}
__ li(v0, Operand(Smi::FromInt(flags)));
__ Push(v0);
CallRuntimeFromDeferred(
Runtime::kAllocateInTargetSpace, 2, instr, instr->context());
__ StoreToSafepointRegisterSlot(v0, result);
if (instr->hydrogen()->IsAllocationFoldingDominator()) {
AllocationFlags allocation_flags = NO_ALLOCATION_FLAGS;
if (instr->hydrogen()->IsOldSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
allocation_flags = static_cast<AllocationFlags>(flags | PRETENURE);
}
// If the allocation folding dominator allocate triggered a GC, allocation
// happend in the runtime. We have to reset the top pointer to virtually
// undo the allocation.
ExternalReference allocation_top =
AllocationUtils::GetAllocationTopReference(isolate(), allocation_flags);
Register top_address = scratch0();
__ Dsubu(v0, v0, Operand(kHeapObjectTag));
__ li(top_address, Operand(allocation_top));
__ sd(v0, MemOperand(top_address));
__ Daddu(v0, v0, Operand(kHeapObjectTag));
}
}
void LCodeGen::DoFastAllocate(LFastAllocate* instr) {
DCHECK(instr->hydrogen()->IsAllocationFolded());
DCHECK(!instr->hydrogen()->IsAllocationFoldingDominator());
Register result = ToRegister(instr->result());
Register scratch1 = ToRegister(instr->temp1());
Register scratch2 = ToRegister(instr->temp2());
AllocationFlags flags = ALLOCATION_FOLDED;
if (instr->hydrogen()->MustAllocateDoubleAligned()) {
flags = static_cast<AllocationFlags>(flags | DOUBLE_ALIGNMENT);
}
if (instr->hydrogen()->IsOldSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
flags = static_cast<AllocationFlags>(flags | PRETENURE);
}
if (instr->size()->IsConstantOperand()) {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
CHECK(size <= kMaxRegularHeapObjectSize);
__ FastAllocate(size, result, scratch1, scratch2, flags);
} else {
Register size = ToRegister(instr->size());
__ FastAllocate(size, result, scratch1, scratch2, flags);
}
}
void LCodeGen::DoTypeof(LTypeof* instr) {
DCHECK(ToRegister(instr->value()).is(a3));
DCHECK(ToRegister(instr->result()).is(v0));
Label end, do_call;
Register value_register = ToRegister(instr->value());
__ JumpIfNotSmi(value_register, &do_call);
__ li(v0, Operand(isolate()->factory()->number_string()));
__ jmp(&end);
__ bind(&do_call);
Callable callable = CodeFactory::Typeof(isolate());
CallCode(callable.code(), RelocInfo::CODE_TARGET, instr);
__ bind(&end);
}
void LCodeGen::DoTypeofIsAndBranch(LTypeofIsAndBranch* instr) {
Register input = ToRegister(instr->value());
Register cmp1 = no_reg;
Operand cmp2 = Operand(no_reg);
Condition final_branch_condition = EmitTypeofIs(instr->TrueLabel(chunk_),
instr->FalseLabel(chunk_),
input,
instr->type_literal(),
&cmp1,
&cmp2);
DCHECK(cmp1.is_valid());
DCHECK(!cmp2.is_reg() || cmp2.rm().is_valid());
if (final_branch_condition != kNoCondition) {
EmitBranch(instr, final_branch_condition, cmp1, cmp2);
}
}
Condition LCodeGen::EmitTypeofIs(Label* true_label,
Label* false_label,
Register input,
Handle<String> type_name,
Register* cmp1,
Operand* cmp2) {
// This function utilizes the delay slot heavily. This is used to load
// values that are always usable without depending on the type of the input
// register.
Condition final_branch_condition = kNoCondition;
Register scratch = scratch0();
Factory* factory = isolate()->factory();
if (String::Equals(type_name, factory->number_string())) {
__ JumpIfSmi(input, true_label);
__ ld(input, FieldMemOperand(input, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
*cmp1 = input;
*cmp2 = Operand(at);
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->string_string())) {
__ JumpIfSmi(input, false_label);
__ GetObjectType(input, input, scratch);
*cmp1 = scratch;
*cmp2 = Operand(FIRST_NONSTRING_TYPE);
final_branch_condition = lt;
} else if (String::Equals(type_name, factory->symbol_string())) {
__ JumpIfSmi(input, false_label);
__ GetObjectType(input, input, scratch);
*cmp1 = scratch;
*cmp2 = Operand(SYMBOL_TYPE);
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->boolean_string())) {
__ LoadRoot(at, Heap::kTrueValueRootIndex);
__ Branch(USE_DELAY_SLOT, true_label, eq, at, Operand(input));
__ LoadRoot(at, Heap::kFalseValueRootIndex);
*cmp1 = at;
*cmp2 = Operand(input);
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->undefined_string())) {
__ LoadRoot(at, Heap::kNullValueRootIndex);
__ Branch(USE_DELAY_SLOT, false_label, eq, at, Operand(input));
// The first instruction of JumpIfSmi is an And - it is safe in the delay
// slot.
__ JumpIfSmi(input, false_label);
// Check for undetectable objects => true.
__ ld(input, FieldMemOperand(input, HeapObject::kMapOffset));
__ lbu(at, FieldMemOperand(input, Map::kBitFieldOffset));
__ And(at, at, 1 << Map::kIsUndetectable);
*cmp1 = at;
*cmp2 = Operand(zero_reg);
final_branch_condition = ne;
} else if (String::Equals(type_name, factory->function_string())) {
__ JumpIfSmi(input, false_label);
__ ld(scratch, FieldMemOperand(input, HeapObject::kMapOffset));
__ lbu(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
__ And(scratch, scratch,
Operand((1 << Map::kIsCallable) | (1 << Map::kIsUndetectable)));
*cmp1 = scratch;
*cmp2 = Operand(1 << Map::kIsCallable);
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->object_string())) {
__ JumpIfSmi(input, false_label);
__ LoadRoot(at, Heap::kNullValueRootIndex);
__ Branch(USE_DELAY_SLOT, true_label, eq, at, Operand(input));
STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
__ GetObjectType(input, scratch, scratch1());
__ Branch(false_label, lt, scratch1(), Operand(FIRST_JS_RECEIVER_TYPE));
// Check for callable or undetectable objects => false.
__ lbu(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
__ And(at, scratch,
Operand((1 << Map::kIsCallable) | (1 << Map::kIsUndetectable)));
*cmp1 = at;
*cmp2 = Operand(zero_reg);
final_branch_condition = eq;
} else {
*cmp1 = at;
*cmp2 = Operand(zero_reg); // Set to valid regs, to avoid caller assertion.
__ Branch(false_label);
}
return final_branch_condition;
}
void LCodeGen::EnsureSpaceForLazyDeopt(int space_needed) {
if (info()->ShouldEnsureSpaceForLazyDeopt()) {
// Ensure that we have enough space after the previous lazy-bailout
// instruction for patching the code here.
int current_pc = masm()->pc_offset();
if (current_pc < last_lazy_deopt_pc_ + space_needed) {
int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
DCHECK_EQ(0, padding_size % Assembler::kInstrSize);
while (padding_size > 0) {
__ nop();
padding_size -= Assembler::kInstrSize;
}
}
}
last_lazy_deopt_pc_ = masm()->pc_offset();
}
void LCodeGen::DoLazyBailout(LLazyBailout* instr) {
last_lazy_deopt_pc_ = masm()->pc_offset();
DCHECK(instr->HasEnvironment());
LEnvironment* env = instr->environment();
RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
}
void LCodeGen::DoDeoptimize(LDeoptimize* instr) {
Deoptimizer::BailoutType type = instr->hydrogen()->type();
// TODO(danno): Stubs expect all deopts to be lazy for historical reasons (the
// needed return address), even though the implementation of LAZY and EAGER is
// now identical. When LAZY is eventually completely folded into EAGER, remove
// the special case below.
if (info()->IsStub() && type == Deoptimizer::EAGER) {
type = Deoptimizer::LAZY;
}
DeoptimizeIf(al, instr, instr->hydrogen()->reason(), type, zero_reg,
Operand(zero_reg));
}
void LCodeGen::DoDummy(LDummy* instr) {
// Nothing to see here, move on!
}
void LCodeGen::DoDummyUse(LDummyUse* instr) {
// Nothing to see here, move on!
}
void LCodeGen::DoDeferredStackCheck(LStackCheck* instr) {
PushSafepointRegistersScope scope(this);
LoadContextFromDeferred(instr->context());
__ CallRuntimeSaveDoubles(Runtime::kStackGuard);
RecordSafepointWithLazyDeopt(
instr, RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
DCHECK(instr->HasEnvironment());
LEnvironment* env = instr->environment();
safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
}
void LCodeGen::DoStackCheck(LStackCheck* instr) {
class DeferredStackCheck final : public LDeferredCode {
public:
DeferredStackCheck(LCodeGen* codegen, LStackCheck* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() override { codegen()->DoDeferredStackCheck(instr_); }
LInstruction* instr() override { return instr_; }
private:
LStackCheck* instr_;
};
DCHECK(instr->HasEnvironment());
LEnvironment* env = instr->environment();
// There is no LLazyBailout instruction for stack-checks. We have to
// prepare for lazy deoptimization explicitly here.
if (instr->hydrogen()->is_function_entry()) {
// Perform stack overflow check.
Label done;
__ LoadRoot(at, Heap::kStackLimitRootIndex);
__ Branch(&done, hs, sp, Operand(at));
DCHECK(instr->context()->IsRegister());
DCHECK(ToRegister(instr->context()).is(cp));
CallCode(isolate()->builtins()->StackCheck(),
RelocInfo::CODE_TARGET,
instr);
__ bind(&done);
} else {
DCHECK(instr->hydrogen()->is_backwards_branch());
// Perform stack overflow check if this goto needs it before jumping.
DeferredStackCheck* deferred_stack_check =
new(zone()) DeferredStackCheck(this, instr);
__ LoadRoot(at, Heap::kStackLimitRootIndex);
__ Branch(deferred_stack_check->entry(), lo, sp, Operand(at));
EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
__ bind(instr->done_label());
deferred_stack_check->SetExit(instr->done_label());
RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
// Don't record a deoptimization index for the safepoint here.
// This will be done explicitly when emitting call and the safepoint in
// the deferred code.
}
}
void LCodeGen::DoOsrEntry(LOsrEntry* instr) {
// This is a pseudo-instruction that ensures that the environment here is
// properly registered for deoptimization and records the assembler's PC
// offset.
LEnvironment* environment = instr->environment();
// If the environment were already registered, we would have no way of
// backpatching it with the spill slot operands.
DCHECK(!environment->HasBeenRegistered());
RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
GenerateOsrPrologue();
}
void LCodeGen::DoForInPrepareMap(LForInPrepareMap* instr) {
Register result = ToRegister(instr->result());
Register object = ToRegister(instr->object());
Label use_cache, call_runtime;
DCHECK(object.is(a0));
__ CheckEnumCache(&call_runtime);
__ ld(result, FieldMemOperand(object, HeapObject::kMapOffset));
__ Branch(&use_cache);
// Get the set of properties to enumerate.
__ bind(&call_runtime);
__ push(object);
CallRuntime(Runtime::kForInEnumerate, instr);
__ bind(&use_cache);
}
void LCodeGen::DoForInCacheArray(LForInCacheArray* instr) {
Register map = ToRegister(instr->map());
Register result = ToRegister(instr->result());
Label load_cache, done;
__ EnumLength(result, map);
__ Branch(&load_cache, ne, result, Operand(Smi::kZero));
__ li(result, Operand(isolate()->factory()->empty_fixed_array()));
__ jmp(&done);
__ bind(&load_cache);
__ LoadInstanceDescriptors(map, result);
__ ld(result,
FieldMemOperand(result, DescriptorArray::kEnumCacheOffset));
__ ld(result,
FieldMemOperand(result, FixedArray::SizeFor(instr->idx())));
DeoptimizeIf(eq, instr, DeoptimizeReason::kNoCache, result,
Operand(zero_reg));
__ bind(&done);
}
void LCodeGen::DoCheckMapValue(LCheckMapValue* instr) {
Register object = ToRegister(instr->value());
Register map = ToRegister(instr->map());
__ ld(scratch0(), FieldMemOperand(object, HeapObject::kMapOffset));
DeoptimizeIf(ne, instr, DeoptimizeReason::kWrongMap, map,
Operand(scratch0()));
}
void LCodeGen::DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
Register result,
Register object,
Register index) {
PushSafepointRegistersScope scope(this);
__ Push(object, index);
__ mov(cp, zero_reg);
__ CallRuntimeSaveDoubles(Runtime::kLoadMutableDouble);
RecordSafepointWithRegisters(
instr->pointer_map(), 2, Safepoint::kNoLazyDeopt);
__ StoreToSafepointRegisterSlot(v0, result);
}
void LCodeGen::DoLoadFieldByIndex(LLoadFieldByIndex* instr) {
class DeferredLoadMutableDouble final : public LDeferredCode {
public:
DeferredLoadMutableDouble(LCodeGen* codegen,
LLoadFieldByIndex* instr,
Register result,
Register object,
Register index)
: LDeferredCode(codegen),
instr_(instr),
result_(result),
object_(object),
index_(index) {
}
void Generate() override {
codegen()->DoDeferredLoadMutableDouble(instr_, result_, object_, index_);
}
LInstruction* instr() override { return instr_; }
private:
LLoadFieldByIndex* instr_;
Register result_;
Register object_;
Register index_;
};
Register object = ToRegister(instr->object());
Register index = ToRegister(instr->index());
Register result = ToRegister(instr->result());
Register scratch = scratch0();
DeferredLoadMutableDouble* deferred;
deferred = new(zone()) DeferredLoadMutableDouble(
this, instr, result, object, index);
Label out_of_object, done;
__ And(scratch, index, Operand(Smi::FromInt(1)));
__ Branch(deferred->entry(), ne, scratch, Operand(zero_reg));
__ dsra(index, index, 1);
__ Branch(USE_DELAY_SLOT, &out_of_object, lt, index, Operand(zero_reg));
__ SmiScale(scratch, index, kPointerSizeLog2); // In delay slot.
__ Daddu(scratch, object, scratch);
__ ld(result, FieldMemOperand(scratch, JSObject::kHeaderSize));
__ Branch(&done);
__ bind(&out_of_object);
__ ld(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
// Index is equal to negated out of object property index plus 1.
__ Dsubu(scratch, result, scratch);
__ ld(result, FieldMemOperand(scratch,
FixedArray::kHeaderSize - kPointerSize));
__ bind(deferred->exit());
__ bind(&done);
}
#undef __
} // namespace internal
} // namespace v8