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v8/src/arm/lithium-codegen-arm.cc
mstarzinger 11fb202f96 Move CompilationInfo::this_has_uses to HGraph::this_has_uses. 
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1029643002

Cr-Commit-Position: refs/heads/master@{#27378}
2015-03-23 19:11:29 +00:00

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// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/v8.h"
#include "src/arm/lithium-codegen-arm.h"
#include "src/arm/lithium-gap-resolver-arm.h"
#include "src/base/bits.h"
#include "src/code-factory.h"
#include "src/code-stubs.h"
#include "src/cpu-profiler.h"
#include "src/hydrogen-osr.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_;
};
#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(GetStackSlotCount());
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()) {
__ vstr(DwVfpRegister::FromAllocationIndex(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()) {
__ vldr(DwVfpRegister::FromAllocationIndex(save_iterator.Current()),
MemOperand(sp, count * kDoubleSize));
save_iterator.Advance();
count++;
}
}
bool LCodeGen::GeneratePrologue() {
DCHECK(is_generating());
if (info()->IsOptimizing()) {
ProfileEntryHookStub::MaybeCallEntryHook(masm_);
#ifdef DEBUG
if (strlen(FLAG_stop_at) > 0 &&
info_->function()->name()->IsUtf8EqualTo(CStrVector(FLAG_stop_at))) {
__ stop("stop_at");
}
#endif
// r1: Callee's JS function.
// cp: Callee's context.
// pp: Callee's constant pool pointer (if FLAG_enable_ool_constant_pool)
// fp: Caller's frame pointer.
// lr: Caller's pc.
// Sloppy mode functions and builtins need to replace the receiver with the
// global proxy when called as functions (without an explicit receiver
// object).
if (graph()->this_has_uses() && is_sloppy(info_->language_mode()) &&
!info_->is_native()) {
Label ok;
int receiver_offset = info_->scope()->num_parameters() * kPointerSize;
__ ldr(r2, MemOperand(sp, receiver_offset));
__ CompareRoot(r2, Heap::kUndefinedValueRootIndex);
__ b(ne, &ok);
__ ldr(r2, GlobalObjectOperand());
__ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalProxyOffset));
__ str(r2, MemOperand(sp, receiver_offset));
__ bind(&ok);
}
}
info()->set_prologue_offset(masm_->pc_offset());
if (NeedsEagerFrame()) {
if (info()->IsStub()) {
__ StubPrologue();
} else {
__ Prologue(info()->IsCodePreAgingActive());
}
frame_is_built_ = true;
info_->AddNoFrameRange(0, masm_->pc_offset());
}
// Reserve space for the stack slots needed by the code.
int slots = GetStackSlotCount();
if (slots > 0) {
if (FLAG_debug_code) {
__ sub(sp, sp, Operand(slots * kPointerSize));
__ push(r0);
__ push(r1);
__ add(r0, sp, Operand(slots * kPointerSize));
__ mov(r1, Operand(kSlotsZapValue));
Label loop;
__ bind(&loop);
__ sub(r0, r0, Operand(kPointerSize));
__ str(r1, MemOperand(r0, 2 * kPointerSize));
__ cmp(r0, sp);
__ b(ne, &loop);
__ pop(r1);
__ pop(r0);
} else {
__ sub(sp, sp, Operand(slots * kPointerSize));
}
}
if (info()->saves_caller_doubles()) {
SaveCallerDoubles();
}
// Possibly allocate a local context.
int heap_slots = info()->num_heap_slots() - Context::MIN_CONTEXT_SLOTS;
if (heap_slots > 0) {
Comment(";;; Allocate local context");
bool need_write_barrier = true;
// Argument to NewContext is the function, which is in r1.
if (heap_slots <= FastNewContextStub::kMaximumSlots) {
FastNewContextStub stub(isolate(), heap_slots);
__ CallStub(&stub);
// Result of FastNewContextStub is always in new space.
need_write_barrier = false;
} else {
__ push(r1);
__ CallRuntime(Runtime::kNewFunctionContext, 1);
}
RecordSafepoint(Safepoint::kNoLazyDeopt);
// Context is returned in both r0 and cp. It replaces the context
// passed to us. It's saved in the stack and kept live in cp.
__ mov(cp, r0);
__ str(r0, MemOperand(fp, StandardFrameConstants::kContextOffset));
// Copy any necessary parameters into the context.
int num_parameters = scope()->num_parameters();
for (int i = 0; i < num_parameters; i++) {
Variable* var = scope()->parameter(i);
if (var->IsContextSlot()) {
int parameter_offset = StandardFrameConstants::kCallerSPOffset +
(num_parameters - 1 - i) * kPointerSize;
// Load parameter from stack.
__ ldr(r0, MemOperand(fp, parameter_offset));
// Store it in the context.
MemOperand target = ContextOperand(cp, var->index());
__ str(r0, target);
// Update the write barrier. This clobbers r3 and r0.
if (need_write_barrier) {
__ RecordWriteContextSlot(
cp,
target.offset(),
r0,
r3,
GetLinkRegisterState(),
kSaveFPRegs);
} else if (FLAG_debug_code) {
Label done;
__ JumpIfInNewSpace(cp, r0, &done);
__ Abort(kExpectedNewSpaceObject);
__ bind(&done);
}
}
}
Comment(";;; End allocate local context");
}
// Trace the call.
if (FLAG_trace && info()->IsOptimizing()) {
// We have not executed any compiled code yet, so cp still holds the
// incoming context.
__ CallRuntime(Runtime::kTraceEnter, 0);
}
return !is_aborted();
}
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);
__ sub(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(
chunk()->graph()->SourcePositionToScriptPosition(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;
__ PushFixedFrame();
__ mov(scratch0(), Operand(Smi::FromInt(StackFrame::STUB)));
__ push(scratch0());
__ add(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
Comment(";;; Deferred code");
}
code->Generate();
if (NeedsDeferredFrame()) {
Comment(";;; Destroy frame");
DCHECK(frame_is_built_);
__ pop(ip);
__ PopFixedFrame();
frame_is_built_ = false;
}
__ jmp(code->exit());
}
}
// Force constant pool emission at the end of the deferred code to make
// sure that no constant pools are emitted after.
masm()->CheckConstPool(true, false);
return !is_aborted();
}
bool LCodeGen::GenerateJumpTable() {
// Check that the jump table is accessible from everywhere in the function
// code, i.e. that offsets to the table can be encoded in the 24bit signed
// immediate of a branch instruction.
// To simplify we consider the code size from the first instruction to the
// end of the jump table. We also don't consider the pc load delta.
// Each entry in the jump table generates one instruction and inlines one
// 32bit data after it.
if (!is_int24((masm()->pc_offset() / Assembler::kInstrSize) +
jump_table_.length() * 7)) {
Abort(kGeneratedCodeIsTooLarge);
}
if (jump_table_.length() > 0) {
Label needs_frame, call_deopt_entry;
Comment(";;; -------------------- Jump table --------------------");
Address base = jump_table_[0].address;
Register entry_offset = scratch0();
int length = jump_table_.length();
for (int i = 0; i < length; i++) {
Deoptimizer::JumpTableEntry* table_entry = &jump_table_[i];
__ bind(&table_entry->label);
DCHECK_EQ(jump_table_[0].bailout_type, table_entry->bailout_type);
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 an immediate
// offset which will be added to the base address later.
__ mov(entry_offset, Operand(entry - base));
if (table_entry->needs_frame) {
DCHECK(!info()->saves_caller_doubles());
Comment(";;; call deopt with frame");
__ PushFixedFrame();
__ bl(&needs_frame);
} else {
__ bl(&call_deopt_entry);
}
info()->LogDeoptCallPosition(masm()->pc_offset(),
table_entry->deopt_info.inlining_id);
masm()->CheckConstPool(false, false);
}
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.
DCHECK(info()->IsStub());
__ mov(ip, Operand(Smi::FromInt(StackFrame::STUB)));
__ push(ip);
__ add(fp, sp, Operand(StandardFrameConstants::kFixedFrameSizeFromFp));
}
Comment(";;; call deopt");
__ bind(&call_deopt_entry);
if (info()->saves_caller_doubles()) {
DCHECK(info()->IsStub());
RestoreCallerDoubles();
}
// Add the base address to the offset previously loaded in entry_offset.
__ add(entry_offset, entry_offset,
Operand(ExternalReference::ForDeoptEntry(base)));
__ bx(entry_offset);
}
// Force constant pool emission at the end of the deopt jump table to make
// sure that no constant pools are emitted after.
masm()->CheckConstPool(true, false);
// 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(), GetStackSlotCount());
return !is_aborted();
}
Register LCodeGen::ToRegister(int index) const {
return Register::FromAllocationIndex(index);
}
DwVfpRegister LCodeGen::ToDoubleRegister(int index) const {
return DwVfpRegister::FromAllocationIndex(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()) {
DCHECK(literal->IsNumber());
__ mov(scratch, Operand(static_cast<int32_t>(literal->Number())));
} else if (r.IsDouble()) {
Abort(kEmitLoadRegisterUnsupportedDoubleImmediate);
} else {
DCHECK(r.IsSmiOrTagged());
__ Move(scratch, literal);
}
return scratch;
} else if (op->IsStackSlot()) {
__ ldr(scratch, ToMemOperand(op));
return scratch;
}
UNREACHABLE();
return scratch;
}
DwVfpRegister LCodeGen::ToDoubleRegister(LOperand* op) const {
DCHECK(op->IsDoubleRegister());
return ToDoubleRegister(op->index());
}
DwVfpRegister LCodeGen::EmitLoadDoubleRegister(LOperand* op,
SwVfpRegister flt_scratch,
DwVfpRegister 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());
__ mov(ip, Operand(static_cast<int32_t>(literal->Number())));
__ vmov(flt_scratch, ip);
__ vcvt_f64_s32(dbl_scratch, flt_scratch);
return dbl_scratch;
} else if (r.IsDouble()) {
Abort(kUnsupportedDoubleImmediate);
} else if (r.IsTagged()) {
Abort(kUnsupportedTaggedImmediate);
}
} else if (op->IsStackSlot()) {
// TODO(regis): Why is vldr not taking a MemOperand?
// __ vldr(dbl_scratch, ToMemOperand(op));
MemOperand mem_op = ToMemOperand(op);
__ vldr(dbl_scratch, mem_op.rn(), mem_op.offset());
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());
}
int32_t LCodeGen::ToRepresentation(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<int32_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::Zero();
}
// Stack slots not implemented, use ToMemOperand instead.
UNREACHABLE();
return Operand::Zero();
}
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, StackSlotOffset(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, StackSlotOffset(op->index()) + kPointerSize);
} else {
// Retrieve parameter without eager stack-frame relative to the
// stack-pointer.
return MemOperand(
sp, ArgumentsOffsetWithoutFrame(op->index()) + kPointerSize);
}
}
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();
// The output frame height does not include the parameters.
int height = translation_size - environment->parameter_count();
WriteTranslation(environment->outer(), translation);
bool has_closure_id = !info()->closure().is_null() &&
!info()->closure().is_identical_to(environment->closure());
int closure_id = has_closure_id
? DefineDeoptimizationLiteral(environment->closure())
: Translation::kSelfLiteralId;
switch (environment->frame_type()) {
case JS_FUNCTION:
translation->BeginJSFrame(environment->ast_id(), closure_id, height);
break;
case JS_CONSTRUCT:
translation->BeginConstructStubFrame(closure_id, translation_size);
break;
case JS_GETTER:
DCHECK(translation_size == 1);
DCHECK(height == 0);
translation->BeginGetterStubFrame(closure_id);
break;
case JS_SETTER:
DCHECK(translation_size == 2);
DCHECK(height == 0);
translation->BeginSetterStubFrame(closure_id);
break;
case STUB:
translation->BeginCompiledStubFrame();
break;
case ARGUMENTS_ADAPTOR:
translation->BeginArgumentsAdaptorFrame(closure_id, translation_size);
break;
}
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()) {
if (is_tagged) {
translation->StoreStackSlot(op->index());
} else if (is_uint32) {
translation->StoreUint32StackSlot(op->index());
} else {
translation->StoreInt32StackSlot(op->index());
}
} else if (op->IsDoubleStackSlot()) {
translation->StoreDoubleStackSlot(op->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();
}
}
int LCodeGen::CallCodeSize(Handle<Code> code, RelocInfo::Mode mode) {
int size = masm()->CallSize(code, mode);
if (code->kind() == Code::BINARY_OP_IC ||
code->kind() == Code::COMPARE_IC) {
size += Assembler::kInstrSize; // extra nop() added in CallCodeGeneric.
}
return size;
}
void LCodeGen::CallCode(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr,
TargetAddressStorageMode storage_mode) {
CallCodeGeneric(code, mode, instr, RECORD_SIMPLE_SAFEPOINT, storage_mode);
}
void LCodeGen::CallCodeGeneric(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr,
SafepointMode safepoint_mode,
TargetAddressStorageMode storage_mode) {
DCHECK(instr != NULL);
// Block literal pool emission to ensure nop indicating no inlined smi code
// is in the correct position.
Assembler::BlockConstPoolScope block_const_pool(masm());
__ Call(code, mode, TypeFeedbackId::None(), al, storage_mode);
RecordSafepointWithLazyDeopt(instr, safepoint_mode);
// Signal that we don't inline smi code before these stubs in the
// optimizing code generator.
if (code->kind() == Code::BINARY_OP_IC ||
code->kind() == Code::COMPARE_IC) {
__ nop();
}
}
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()) {
__ ldr(cp, ToMemOperand(context));
} else if (context->IsConstantOperand()) {
HConstant* constant =
chunk_->LookupConstant(LConstantOperand::cast(context));
__ Move(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,
Deoptimizer::DeoptReason deopt_reason,
Deoptimizer::BailoutType bailout_type) {
LEnvironment* environment = instr->environment();
RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
DCHECK(environment->HasBeenRegistered());
int id = environment->deoptimization_index();
DCHECK(info()->IsOptimizing() || info()->IsStub());
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());
// Store the condition on the stack if necessary
if (condition != al) {
__ mov(scratch, Operand::Zero(), LeaveCC, NegateCondition(condition));
__ mov(scratch, Operand(1), LeaveCC, condition);
__ push(scratch);
}
__ push(r1);
__ mov(scratch, Operand(count));
__ ldr(r1, MemOperand(scratch));
__ sub(r1, r1, Operand(1), SetCC);
__ mov(r1, Operand(FLAG_deopt_every_n_times), LeaveCC, eq);
__ str(r1, MemOperand(scratch));
__ pop(r1);
if (condition != al) {
// Clean up the stack before the deoptimizer call
__ pop(scratch);
}
__ Call(entry, RelocInfo::RUNTIME_ENTRY, eq);
// 'Restore' the condition in a slightly hacky way. (It would be better
// to use 'msr' and 'mrs' instructions here, but they are not supported by
// our ARM simulator).
if (condition != al) {
condition = ne;
__ cmp(scratch, Operand::Zero());
}
}
if (info()->ShouldTrapOnDeopt()) {
__ stop("trap_on_deopt", condition);
}
Deoptimizer::DeoptInfo deopt_info = MakeDeoptInfo(instr, deopt_reason);
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);
info()->LogDeoptCallPosition(masm()->pc_offset(), deopt_info.inlining_id);
} else {
Deoptimizer::JumpTableEntry table_entry(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()->cpu_profiler()->is_profiling() ||
jump_table_.is_empty() ||
!table_entry.IsEquivalentTo(jump_table_.last())) {
jump_table_.Add(table_entry, zone());
}
__ b(condition, &jump_table_.last().label);
}
}
void LCodeGen::DeoptimizeIf(Condition condition, LInstruction* instr,
Deoptimizer::DeoptReason deopt_reason) {
Deoptimizer::BailoutType bailout_type = info()->IsStub()
? Deoptimizer::LAZY
: Deoptimizer::EAGER;
DeoptimizeIf(condition, instr, deopt_reason, bailout_type);
}
void LCodeGen::PopulateDeoptimizationData(Handle<Code> code) {
int length = deoptimizations_.length();
if (length == 0) return;
Handle<DeoptimizationInputData> data =
DeoptimizationInputData::New(isolate(), length, TENURED);
Handle<ByteArray> translations =
translations_.CreateByteArray(isolate()->factory());
data->SetTranslationByteArray(*translations);
data->SetInlinedFunctionCount(Smi::FromInt(inlined_function_count_));
data->SetOptimizationId(Smi::FromInt(info_->optimization_id()));
if (info_->IsOptimizing()) {
// Reference to shared function info does not change between phases.
AllowDeferredHandleDereference allow_handle_dereference;
data->SetSharedFunctionInfo(*info_->shared_info());
} else {
data->SetSharedFunctionInfo(Smi::FromInt(0));
}
data->SetWeakCellCache(Smi::FromInt(0));
Handle<FixedArray> literals =
factory()->NewFixedArray(deoptimization_literals_.length(), TENURED);
{ AllowDeferredHandleDereference copy_handles;
for (int i = 0; i < deoptimization_literals_.length(); i++) {
literals->set(i, *deoptimization_literals_[i]);
}
data->SetLiteralArray(*literals);
}
data->SetOsrAstId(Smi::FromInt(info_->osr_ast_id().ToInt()));
data->SetOsrPcOffset(Smi::FromInt(osr_pc_offset_));
// Populate the deoptimization entries.
for (int i = 0; i < length; i++) {
LEnvironment* env = deoptimizations_[i];
data->SetAstId(i, env->ast_id());
data->SetTranslationIndex(i, Smi::FromInt(env->translation_index()));
data->SetArgumentsStackHeight(i,
Smi::FromInt(env->arguments_stack_height()));
data->SetPc(i, Smi::FromInt(env->pc_offset()));
}
code->set_deoptimization_data(*data);
}
int LCodeGen::DefineDeoptimizationLiteral(Handle<Object> literal) {
int result = deoptimization_literals_.length();
for (int i = 0; i < deoptimization_literals_.length(); ++i) {
if (deoptimization_literals_[i].is_identical_to(literal)) return i;
}
deoptimization_literals_.Add(literal, zone());
return result;
}
void LCodeGen::PopulateDeoptimizationLiteralsWithInlinedFunctions() {
DCHECK(deoptimization_literals_.length() == 0);
const ZoneList<Handle<JSFunction> >* inlined_closures =
chunk()->inlined_closures();
for (int i = 0, length = inlined_closures->length();
i < length;
i++) {
DefineDeoptimizationLiteral(inlined_closures->at(i));
}
inlined_function_count_ = deoptimization_literals_.length();
}
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());
}
}
if (FLAG_enable_ool_constant_pool && (kind & Safepoint::kWithRegisters)) {
// Register pp always contains a pointer to the constant pool.
safepoint.DefinePointerRegister(pp, 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);
}
void LCodeGen::RecordAndWritePosition(int position) {
if (position == RelocInfo::kNoPosition) return;
masm()->positions_recorder()->RecordPosition(position);
masm()->positions_recorder()->WriteRecordedPositions();
}
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::DoCallStub(LCallStub* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->result()).is(r0));
switch (instr->hydrogen()->major_key()) {
case CodeStub::RegExpExec: {
RegExpExecStub stub(isolate());
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
break;
}
case CodeStub::SubString: {
SubStringStub stub(isolate());
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
break;
}
case CodeStub::StringCompare: {
StringCompareStub stub(isolate());
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
break;
}
default:
UNREACHABLE();
}
}
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)) {
__ cmp(dividend, Operand::Zero());
__ b(pl, &dividend_is_not_negative);
// Note that this is correct even for kMinInt operands.
__ rsb(dividend, dividend, Operand::Zero());
__ and_(dividend, dividend, Operand(mask));
__ rsb(dividend, dividend, Operand::Zero(), SetCC);
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
}
__ b(&done);
}
__ bind(&dividend_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, Deoptimizer::kDivisionByZero);
return;
}
__ TruncatingDiv(result, dividend, Abs(divisor));
__ mov(ip, Operand(Abs(divisor)));
__ smull(result, ip, result, ip);
__ sub(result, dividend, result, SetCC);
// Check for negative zero.
HMod* hmod = instr->hydrogen();
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label remainder_not_zero;
__ b(ne, &remainder_not_zero);
__ cmp(dividend, Operand::Zero());
DeoptimizeIf(lt, instr, Deoptimizer::kMinusZero);
__ bind(&remainder_not_zero);
}
}
void LCodeGen::DoModI(LModI* instr) {
HMod* hmod = instr->hydrogen();
if (CpuFeatures::IsSupported(SUDIV)) {
CpuFeatureScope scope(masm(), SUDIV);
Register left_reg = ToRegister(instr->left());
Register right_reg = ToRegister(instr->right());
Register result_reg = ToRegister(instr->result());
Label done;
// Check for x % 0, sdiv might signal an exception. We have to deopt in this
// case because we can't return a NaN.
if (hmod->CheckFlag(HValue::kCanBeDivByZero)) {
__ cmp(right_reg, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kDivisionByZero);
}
// Check for kMinInt % -1, sdiv 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;
__ cmp(left_reg, Operand(kMinInt));
__ b(ne, &no_overflow_possible);
__ cmp(right_reg, Operand(-1));
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
} else {
__ b(ne, &no_overflow_possible);
__ mov(result_reg, Operand::Zero());
__ jmp(&done);
}
__ bind(&no_overflow_possible);
}
// For 'r3 = r1 % r2' we can have the following ARM code:
// sdiv r3, r1, r2
// mls r3, r3, r2, r1
__ sdiv(result_reg, left_reg, right_reg);
__ Mls(result_reg, result_reg, right_reg, left_reg);
// If we care about -0, test if the dividend is <0 and the result is 0.
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
__ cmp(result_reg, Operand::Zero());
__ b(ne, &done);
__ cmp(left_reg, Operand::Zero());
DeoptimizeIf(lt, instr, Deoptimizer::kMinusZero);
}
__ bind(&done);
} else {
// General case, without any SDIV support.
Register left_reg = ToRegister(instr->left());
Register right_reg = ToRegister(instr->right());
Register result_reg = ToRegister(instr->result());
Register scratch = scratch0();
DCHECK(!scratch.is(left_reg));
DCHECK(!scratch.is(right_reg));
DCHECK(!scratch.is(result_reg));
DwVfpRegister dividend = ToDoubleRegister(instr->temp());
DwVfpRegister divisor = ToDoubleRegister(instr->temp2());
DCHECK(!divisor.is(dividend));
LowDwVfpRegister quotient = double_scratch0();
DCHECK(!quotient.is(dividend));
DCHECK(!quotient.is(divisor));
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)) {
__ cmp(right_reg, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kDivisionByZero);
}
__ Move(result_reg, left_reg);
// Load the arguments in VFP registers. The divisor value is preloaded
// before. Be careful that 'right_reg' is only live on entry.
// TODO(svenpanne) The last comments seems to be wrong nowadays.
__ vmov(double_scratch0().low(), left_reg);
__ vcvt_f64_s32(dividend, double_scratch0().low());
__ vmov(double_scratch0().low(), right_reg);
__ vcvt_f64_s32(divisor, double_scratch0().low());
// We do not care about the sign of the divisor. Note that we still handle
// the kMinInt % -1 case correctly, though.
__ vabs(divisor, divisor);
// Compute the quotient and round it to a 32bit integer.
__ vdiv(quotient, dividend, divisor);
__ vcvt_s32_f64(quotient.low(), quotient);
__ vcvt_f64_s32(quotient, quotient.low());
// Compute the remainder in result.
__ vmul(double_scratch0(), divisor, quotient);
__ vcvt_s32_f64(double_scratch0().low(), double_scratch0());
__ vmov(scratch, double_scratch0().low());
__ sub(result_reg, left_reg, scratch, SetCC);
// If we care about -0, test if the dividend is <0 and the result is 0.
if (hmod->CheckFlag(HValue::kBailoutOnMinusZero)) {
__ b(ne, &done);
__ cmp(left_reg, Operand::Zero());
DeoptimizeIf(mi, instr, Deoptimizer::kMinusZero);
}
__ 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) {
__ cmp(dividend, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
}
// Check for (kMinInt / -1).
if (hdiv->CheckFlag(HValue::kCanOverflow) && divisor == -1) {
__ cmp(dividend, Operand(kMinInt));
DeoptimizeIf(eq, instr, Deoptimizer::kOverflow);
}
// 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);
__ tst(dividend, Operand(mask));
DeoptimizeIf(ne, instr, Deoptimizer::kLostPrecision);
}
if (divisor == -1) { // Nice shortcut, not needed for correctness.
__ rsb(result, dividend, Operand(0));
return;
}
int32_t shift = WhichPowerOf2Abs(divisor);
if (shift == 0) {
__ mov(result, dividend);
} else if (shift == 1) {
__ add(result, dividend, Operand(dividend, LSR, 31));
} else {
__ mov(result, Operand(dividend, ASR, 31));
__ add(result, dividend, Operand(result, LSR, 32 - shift));
}
if (shift > 0) __ mov(result, Operand(result, ASR, shift));
if (divisor < 0) __ rsb(result, result, Operand(0));
}
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, Deoptimizer::kDivisionByZero);
return;
}
// Check for (0 / -x) that will produce negative zero.
HDiv* hdiv = instr->hydrogen();
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
__ cmp(dividend, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
}
__ TruncatingDiv(result, dividend, Abs(divisor));
if (divisor < 0) __ rsb(result, result, Operand::Zero());
if (!hdiv->CheckFlag(HInstruction::kAllUsesTruncatingToInt32)) {
__ mov(ip, Operand(divisor));
__ smull(scratch0(), ip, result, ip);
__ sub(scratch0(), scratch0(), dividend, SetCC);
DeoptimizeIf(ne, instr, Deoptimizer::kLostPrecision);
}
}
// 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());
Register result = ToRegister(instr->result());
// Check for x / 0.
if (hdiv->CheckFlag(HValue::kCanBeDivByZero)) {
__ cmp(divisor, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kDivisionByZero);
}
// Check for (0 / -x) that will produce negative zero.
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label positive;
if (!instr->hydrogen_value()->CheckFlag(HValue::kCanBeDivByZero)) {
// Do the test only if it hadn't be done above.
__ cmp(divisor, Operand::Zero());
}
__ b(pl, &positive);
__ cmp(dividend, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
__ bind(&positive);
}
// Check for (kMinInt / -1).
if (hdiv->CheckFlag(HValue::kCanOverflow) &&
(!CpuFeatures::IsSupported(SUDIV) ||
!hdiv->CheckFlag(HValue::kAllUsesTruncatingToInt32))) {
// We don't need to check for overflow when truncating with sdiv
// support because, on ARM, sdiv kMinInt, -1 -> kMinInt.
__ cmp(dividend, Operand(kMinInt));
__ cmp(divisor, Operand(-1), eq);
DeoptimizeIf(eq, instr, Deoptimizer::kOverflow);
}
if (CpuFeatures::IsSupported(SUDIV)) {
CpuFeatureScope scope(masm(), SUDIV);
__ sdiv(result, dividend, divisor);
} else {
DoubleRegister vleft = ToDoubleRegister(instr->temp());
DoubleRegister vright = double_scratch0();
__ vmov(double_scratch0().low(), dividend);
__ vcvt_f64_s32(vleft, double_scratch0().low());
__ vmov(double_scratch0().low(), divisor);
__ vcvt_f64_s32(vright, double_scratch0().low());
__ vdiv(vleft, vleft, vright); // vleft now contains the result.
__ vcvt_s32_f64(double_scratch0().low(), vleft);
__ vmov(result, double_scratch0().low());
}
if (!hdiv->CheckFlag(HValue::kAllUsesTruncatingToInt32)) {
// Compute remainder and deopt if it's not zero.
Register remainder = scratch0();
__ Mls(remainder, result, divisor, dividend);
__ cmp(remainder, Operand::Zero());
DeoptimizeIf(ne, instr, Deoptimizer::kLostPrecision);
}
}
void LCodeGen::DoMultiplyAddD(LMultiplyAddD* instr) {
DwVfpRegister addend = ToDoubleRegister(instr->addend());
DwVfpRegister multiplier = ToDoubleRegister(instr->multiplier());
DwVfpRegister multiplicand = ToDoubleRegister(instr->multiplicand());
// This is computed in-place.
DCHECK(addend.is(ToDoubleRegister(instr->result())));
__ vmla(addend, multiplier, multiplicand);
}
void LCodeGen::DoMultiplySubD(LMultiplySubD* instr) {
DwVfpRegister minuend = ToDoubleRegister(instr->minuend());
DwVfpRegister multiplier = ToDoubleRegister(instr->multiplier());
DwVfpRegister multiplicand = ToDoubleRegister(instr->multiplicand());
// This is computed in-place.
DCHECK(minuend.is(ToDoubleRegister(instr->result())));
__ vmls(minuend, multiplier, multiplicand);
}
void LCodeGen::DoFlooringDivByPowerOf2I(LFlooringDivByPowerOf2I* instr) {
Register dividend = ToRegister(instr->dividend());
Register result = ToRegister(instr->result());
int32_t divisor = instr->divisor();
// If the divisor is 1, return the dividend.
if (divisor == 1) {
__ 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.
int32_t shift = WhichPowerOf2Abs(divisor);
if (divisor > 1) {
__ mov(result, Operand(dividend, ASR, shift));
return;
}
// If the divisor is negative, we have to negate and handle edge cases.
__ rsb(result, dividend, Operand::Zero(), SetCC);
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
}
// Dividing by -1 is basically negation, unless we overflow.
if (divisor == -1) {
if (instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
}
return;
}
// If the negation could not overflow, simply shifting is OK.
if (!instr->hydrogen()->CheckFlag(HValue::kLeftCanBeMinInt)) {
__ mov(result, Operand(result, ASR, shift));
return;
}
__ mov(result, Operand(kMinInt / divisor), LeaveCC, vs);
__ mov(result, Operand(result, ASR, shift), LeaveCC, vc);
}
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, Deoptimizer::kDivisionByZero);
return;
}
// Check for (0 / -x) that will produce negative zero.
HMathFloorOfDiv* hdiv = instr->hydrogen();
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero) && divisor < 0) {
__ cmp(dividend, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
}
// 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) __ rsb(result, result, Operand::Zero());
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;
__ cmp(dividend, Operand::Zero());
__ b(divisor > 0 ? lt : gt, &needs_adjustment);
__ TruncatingDiv(result, dividend, Abs(divisor));
if (divisor < 0) __ rsb(result, result, Operand::Zero());
__ jmp(&done);
__ bind(&needs_adjustment);
__ add(temp, dividend, Operand(divisor > 0 ? 1 : -1));
__ TruncatingDiv(result, temp, Abs(divisor));
if (divisor < 0) __ rsb(result, result, Operand::Zero());
__ sub(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 left = ToRegister(instr->dividend());
Register right = ToRegister(instr->divisor());
Register result = ToRegister(instr->result());
// Check for x / 0.
if (hdiv->CheckFlag(HValue::kCanBeDivByZero)) {
__ cmp(right, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kDivisionByZero);
}
// Check for (0 / -x) that will produce negative zero.
if (hdiv->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label positive;
if (!instr->hydrogen_value()->CheckFlag(HValue::kCanBeDivByZero)) {
// Do the test only if it hadn't be done above.
__ cmp(right, Operand::Zero());
}
__ b(pl, &positive);
__ cmp(left, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
__ bind(&positive);
}
// Check for (kMinInt / -1).
if (hdiv->CheckFlag(HValue::kCanOverflow) &&
(!CpuFeatures::IsSupported(SUDIV) ||
!hdiv->CheckFlag(HValue::kAllUsesTruncatingToInt32))) {
// We don't need to check for overflow when truncating with sdiv
// support because, on ARM, sdiv kMinInt, -1 -> kMinInt.
__ cmp(left, Operand(kMinInt));
__ cmp(right, Operand(-1), eq);
DeoptimizeIf(eq, instr, Deoptimizer::kOverflow);
}
if (CpuFeatures::IsSupported(SUDIV)) {
CpuFeatureScope scope(masm(), SUDIV);
__ sdiv(result, left, right);
} else {
DoubleRegister vleft = ToDoubleRegister(instr->temp());
DoubleRegister vright = double_scratch0();
__ vmov(double_scratch0().low(), left);
__ vcvt_f64_s32(vleft, double_scratch0().low());
__ vmov(double_scratch0().low(), right);
__ vcvt_f64_s32(vright, double_scratch0().low());
__ vdiv(vleft, vleft, vright); // vleft now contains the result.
__ vcvt_s32_f64(double_scratch0().low(), vleft);
__ vmov(result, double_scratch0().low());
}
Label done;
Register remainder = scratch0();
__ Mls(remainder, result, right, left);
__ cmp(remainder, Operand::Zero());
__ b(eq, &done);
__ eor(remainder, remainder, Operand(right));
__ add(result, result, Operand(remainder, ASR, 31));
__ bind(&done);
}
void LCodeGen::DoMulI(LMulI* instr) {
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.
__ cmp(left, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
}
switch (constant) {
case -1:
if (overflow) {
__ rsb(result, left, Operand::Zero(), SetCC);
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
} else {
__ rsb(result, left, Operand::Zero());
}
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.
__ cmp(left, Operand::Zero());
DeoptimizeIf(mi, instr, Deoptimizer::kMinusZero);
}
__ mov(result, Operand::Zero());
break;
case 1:
__ 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);
__ mov(result, Operand(left, LSL, shift));
// Correct the sign of the result is the constant is negative.
if (constant < 0) __ rsb(result, result, Operand::Zero());
} else if (base::bits::IsPowerOfTwo32(constant_abs - 1)) {
int32_t shift = WhichPowerOf2(constant_abs - 1);
__ add(result, left, Operand(left, LSL, shift));
// Correct the sign of the result is the constant is negative.
if (constant < 0) __ rsb(result, result, Operand::Zero());
} else if (base::bits::IsPowerOfTwo32(constant_abs + 1)) {
int32_t shift = WhichPowerOf2(constant_abs + 1);
__ rsb(result, left, Operand(left, LSL, shift));
// Correct the sign of the result is the constant is negative.
if (constant < 0) __ rsb(result, result, Operand::Zero());
} else {
// Generate standard code.
__ mov(ip, Operand(constant));
__ mul(result, left, ip);
}
}
} else {
DCHECK(right_op->IsRegister());
Register right = ToRegister(right_op);
if (overflow) {
Register scratch = scratch0();
// scratch:result = left * right.
if (instr->hydrogen()->representation().IsSmi()) {
__ SmiUntag(result, left);
__ smull(result, scratch, result, right);
} else {
__ smull(result, scratch, left, right);
}
__ cmp(scratch, Operand(result, ASR, 31));
DeoptimizeIf(ne, instr, Deoptimizer::kOverflow);
} else {
if (instr->hydrogen()->representation().IsSmi()) {
__ SmiUntag(result, left);
__ mul(result, result, right);
} else {
__ mul(result, left, right);
}
}
if (bailout_on_minus_zero) {
Label done;
__ teq(left, Operand(right));
__ b(pl, &done);
// Bail out if the result is minus zero.
__ cmp(result, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
__ 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, ip));
} 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:
__ orr(result, left, right);
break;
case Token::BIT_XOR:
if (right_op->IsConstantOperand() && right.immediate() == int32_t(~0)) {
__ mvn(result, Operand(left));
} else {
__ eor(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());
Register scratch = scratch0();
if (right_op->IsRegister()) {
// Mask the right_op operand.
__ and_(scratch, ToRegister(right_op), Operand(0x1F));
switch (instr->op()) {
case Token::ROR:
__ mov(result, Operand(left, ROR, scratch));
break;
case Token::SAR:
__ mov(result, Operand(left, ASR, scratch));
break;
case Token::SHR:
if (instr->can_deopt()) {
__ mov(result, Operand(left, LSR, scratch), SetCC);
DeoptimizeIf(mi, instr, Deoptimizer::kNegativeValue);
} else {
__ mov(result, Operand(left, LSR, scratch));
}
break;
case Token::SHL:
__ mov(result, Operand(left, LSL, scratch));
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) {
__ mov(result, Operand(left, ROR, shift_count));
} else {
__ Move(result, left);
}
break;
case Token::SAR:
if (shift_count != 0) {
__ mov(result, Operand(left, ASR, shift_count));
} else {
__ Move(result, left);
}
break;
case Token::SHR:
if (shift_count != 0) {
__ mov(result, Operand(left, LSR, shift_count));
} else {
if (instr->can_deopt()) {
__ tst(left, Operand(0x80000000));
DeoptimizeIf(ne, instr, Deoptimizer::kNegativeValue);
}
__ Move(result, left);
}
break;
case Token::SHL:
if (shift_count != 0) {
if (instr->hydrogen_value()->representation().IsSmi() &&
instr->can_deopt()) {
if (shift_count != 1) {
__ mov(result, Operand(left, LSL, shift_count - 1));
__ SmiTag(result, result, SetCC);
} else {
__ SmiTag(result, left, SetCC);
}
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
} else {
__ mov(result, Operand(left, LSL, shift_count));
}
} else {
__ Move(result, left);
}
break;
default:
UNREACHABLE();
break;
}
}
}
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);
SBit set_cond = can_overflow ? SetCC : LeaveCC;
if (right->IsStackSlot()) {
Register right_reg = EmitLoadRegister(right, ip);
__ sub(ToRegister(result), ToRegister(left), Operand(right_reg), set_cond);
} else {
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ sub(ToRegister(result), ToRegister(left), ToOperand(right), set_cond);
}
if (can_overflow) {
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
}
}
void LCodeGen::DoRSubI(LRSubI* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
LOperand* result = instr->result();
bool can_overflow = instr->hydrogen()->CheckFlag(HValue::kCanOverflow);
SBit set_cond = can_overflow ? SetCC : LeaveCC;
if (right->IsStackSlot()) {
Register right_reg = EmitLoadRegister(right, ip);
__ rsb(ToRegister(result), ToRegister(left), Operand(right_reg), set_cond);
} else {
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ rsb(ToRegister(result), ToRegister(left), ToOperand(right), set_cond);
}
if (can_overflow) {
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
}
}
void LCodeGen::DoConstantI(LConstantI* instr) {
__ mov(ToRegister(instr->result()), Operand(instr->value()));
}
void LCodeGen::DoConstantS(LConstantS* instr) {
__ mov(ToRegister(instr->result()), Operand(instr->value()));
}
void LCodeGen::DoConstantD(LConstantD* instr) {
DCHECK(instr->result()->IsDoubleRegister());
DwVfpRegister result = ToDoubleRegister(instr->result());
#if V8_HOST_ARCH_IA32
// Need some crappy work-around for x87 sNaN -> qNaN breakage in simulator
// builds.
uint64_t bits = instr->bits();
if ((bits & V8_UINT64_C(0x7FF8000000000000)) ==
V8_UINT64_C(0x7FF0000000000000)) {
uint32_t lo = static_cast<uint32_t>(bits);
uint32_t hi = static_cast<uint32_t>(bits >> 32);
__ mov(ip, Operand(lo));
__ mov(scratch0(), Operand(hi));
__ vmov(result, ip, scratch0());
return;
}
#endif
double v = instr->value();
__ Vmov(result, v, scratch0());
}
void LCodeGen::DoConstantE(LConstantE* instr) {
__ mov(ToRegister(instr->result()), Operand(instr->value()));
}
void LCodeGen::DoConstantT(LConstantT* instr) {
Handle<Object> object = instr->value(isolate());
AllowDeferredHandleDereference smi_check;
__ Move(ToRegister(instr->result()), object);
}
void LCodeGen::DoMapEnumLength(LMapEnumLength* instr) {
Register result = ToRegister(instr->result());
Register map = ToRegister(instr->value());
__ EnumLength(result, map);
}
void LCodeGen::DoDateField(LDateField* instr) {
Register object = ToRegister(instr->date());
Register result = ToRegister(instr->result());
Register scratch = ToRegister(instr->temp());
Smi* index = instr->index();
Label runtime, done;
DCHECK(object.is(result));
DCHECK(object.is(r0));
DCHECK(!scratch.is(scratch0()));
DCHECK(!scratch.is(object));
__ SmiTst(object);
DeoptimizeIf(eq, instr, Deoptimizer::kSmi);
__ CompareObjectType(object, scratch, scratch, JS_DATE_TYPE);
DeoptimizeIf(ne, instr, Deoptimizer::kNotADateObject);
if (index->value() == 0) {
__ ldr(result, FieldMemOperand(object, JSDate::kValueOffset));
} else {
if (index->value() < JSDate::kFirstUncachedField) {
ExternalReference stamp = ExternalReference::date_cache_stamp(isolate());
__ mov(scratch, Operand(stamp));
__ ldr(scratch, MemOperand(scratch));
__ ldr(scratch0(), FieldMemOperand(object, JSDate::kCacheStampOffset));
__ cmp(scratch, scratch0());
__ b(ne, &runtime);
__ ldr(result, FieldMemOperand(object, JSDate::kValueOffset +
kPointerSize * index->value()));
__ jmp(&done);
}
__ bind(&runtime);
__ PrepareCallCFunction(2, scratch);
__ mov(r1, Operand(index));
__ CallCFunction(ExternalReference::get_date_field_function(isolate()), 2);
__ bind(&done);
}
}
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) {
__ add(scratch, string, Operand(ToRegister(index)));
} else {
STATIC_ASSERT(kUC16Size == 2);
__ add(scratch, string, Operand(ToRegister(index), LSL, 1));
}
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();
__ ldr(scratch, FieldMemOperand(string, HeapObject::kMapOffset));
__ ldrb(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;
__ cmp(scratch, Operand(encoding == String::ONE_BYTE_ENCODING
? one_byte_seq_type : two_byte_seq_type));
__ Check(eq, kUnexpectedStringType);
}
MemOperand operand = BuildSeqStringOperand(string, instr->index(), encoding);
if (encoding == String::ONE_BYTE_ENCODING) {
__ ldrb(result, operand);
} else {
__ ldrh(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 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, encoding_mask);
}
MemOperand operand = BuildSeqStringOperand(string, instr->index(), encoding);
if (encoding == String::ONE_BYTE_ENCODING) {
__ strb(value, operand);
} else {
__ strh(value, operand);
}
}
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);
SBit set_cond = can_overflow ? SetCC : LeaveCC;
if (right->IsStackSlot()) {
Register right_reg = EmitLoadRegister(right, ip);
__ add(ToRegister(result), ToRegister(left), Operand(right_reg), set_cond);
} else {
DCHECK(right->IsRegister() || right->IsConstantOperand());
__ add(ToRegister(result), ToRegister(left), ToOperand(right), set_cond);
}
if (can_overflow) {
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
}
}
void LCodeGen::DoMathMinMax(LMathMinMax* instr) {
LOperand* left = instr->left();
LOperand* right = instr->right();
HMathMinMax::Operation operation = instr->hydrogen()->operation();
if (instr->hydrogen()->representation().IsSmiOrInteger32()) {
Condition condition = (operation == HMathMinMax::kMathMin) ? le : ge;
Register left_reg = ToRegister(left);
Operand right_op = (right->IsRegister() || right->IsConstantOperand())
? ToOperand(right)
: Operand(EmitLoadRegister(right, ip));
Register result_reg = ToRegister(instr->result());
__ cmp(left_reg, right_op);
__ Move(result_reg, left_reg, condition);
__ mov(result_reg, right_op, LeaveCC, NegateCondition(condition));
} else {
DCHECK(instr->hydrogen()->representation().IsDouble());
DwVfpRegister left_reg = ToDoubleRegister(left);
DwVfpRegister right_reg = ToDoubleRegister(right);
DwVfpRegister result_reg = ToDoubleRegister(instr->result());
Label result_is_nan, return_left, return_right, check_zero, done;
__ VFPCompareAndSetFlags(left_reg, right_reg);
if (operation == HMathMinMax::kMathMin) {
__ b(mi, &return_left);
__ b(gt, &return_right);
} else {
__ b(mi, &return_right);
__ b(gt, &return_left);
}
__ b(vs, &result_is_nan);
// Left equals right => check for -0.
__ VFPCompareAndSetFlags(left_reg, 0.0);
if (left_reg.is(result_reg) || right_reg.is(result_reg)) {
__ b(ne, &done); // left == right != 0.
} else {
__ b(ne, &return_left); // left == right != 0.
}
// At this point, both left and right are either 0 or -0.
if (operation == HMathMinMax::kMathMin) {
// We could use a single 'vorr' instruction here if we had NEON support.
__ vneg(left_reg, left_reg);
__ vsub(result_reg, left_reg, right_reg);
__ vneg(result_reg, result_reg);
} else {
// Since we operate on +0 and/or -0, vadd and vand have the same effect;
// the decision for vadd is easy because vand is a NEON instruction.
__ vadd(result_reg, left_reg, right_reg);
}
__ b(&done);
__ bind(&result_is_nan);
__ vadd(result_reg, left_reg, right_reg);
__ b(&done);
__ bind(&return_right);
__ Move(result_reg, right_reg);
if (!left_reg.is(result_reg)) {
__ b(&done);
}
__ bind(&return_left);
__ Move(result_reg, left_reg);
__ bind(&done);
}
}
void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
DwVfpRegister left = ToDoubleRegister(instr->left());
DwVfpRegister right = ToDoubleRegister(instr->right());
DwVfpRegister result = ToDoubleRegister(instr->result());
switch (instr->op()) {
case Token::ADD:
__ vadd(result, left, right);
break;
case Token::SUB:
__ vsub(result, left, right);
break;
case Token::MUL:
__ vmul(result, left, right);
break;
case Token::DIV:
__ vdiv(result, left, right);
break;
case Token::MOD: {
__ 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);
break;
}
default:
UNREACHABLE();
break;
}
}
void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->left()).is(r1));
DCHECK(ToRegister(instr->right()).is(r0));
DCHECK(ToRegister(instr->result()).is(r0));
Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), instr->op()).code();
// Block literal pool emission to ensure nop indicating no inlined smi code
// is in the correct position.
Assembler::BlockConstPoolScope block_const_pool(masm());
CallCode(code, RelocInfo::CODE_TARGET, instr);
}
template<class InstrType>
void LCodeGen::EmitBranch(InstrType instr, Condition condition) {
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) {
__ b(NegateCondition(condition), chunk_->GetAssemblyLabel(right_block));
} else if (right_block == next_block) {
__ b(condition, chunk_->GetAssemblyLabel(left_block));
} else {
__ b(condition, chunk_->GetAssemblyLabel(left_block));
__ b(chunk_->GetAssemblyLabel(right_block));
}
}
template<class InstrType>
void LCodeGen::EmitFalseBranch(InstrType instr, Condition condition) {
int false_block = instr->FalseDestination(chunk_);
__ b(condition, chunk_->GetAssemblyLabel(false_block));
}
void LCodeGen::DoDebugBreak(LDebugBreak* instr) {
__ stop("LBreak");
}
void LCodeGen::DoBranch(LBranch* instr) {
Representation r = instr->hydrogen()->value()->representation();
if (r.IsInteger32() || r.IsSmi()) {
DCHECK(!info()->IsStub());
Register reg = ToRegister(instr->value());
__ cmp(reg, Operand::Zero());
EmitBranch(instr, ne);
} else if (r.IsDouble()) {
DCHECK(!info()->IsStub());
DwVfpRegister reg = ToDoubleRegister(instr->value());
// Test the double value. Zero and NaN are false.
__ VFPCompareAndSetFlags(reg, 0.0);
__ cmp(r0, r0, vs); // If NaN, set the Z flag. (NaN -> false)
EmitBranch(instr, ne);
} else {
DCHECK(r.IsTagged());
Register reg = ToRegister(instr->value());
HType type = instr->hydrogen()->value()->type();
if (type.IsBoolean()) {
DCHECK(!info()->IsStub());
__ CompareRoot(reg, Heap::kTrueValueRootIndex);
EmitBranch(instr, eq);
} else if (type.IsSmi()) {
DCHECK(!info()->IsStub());
__ cmp(reg, Operand::Zero());
EmitBranch(instr, ne);
} else if (type.IsJSArray()) {
DCHECK(!info()->IsStub());
EmitBranch(instr, al);
} else if (type.IsHeapNumber()) {
DCHECK(!info()->IsStub());
DwVfpRegister dbl_scratch = double_scratch0();
__ vldr(dbl_scratch, FieldMemOperand(reg, HeapNumber::kValueOffset));
// Test the double value. Zero and NaN are false.
__ VFPCompareAndSetFlags(dbl_scratch, 0.0);
__ cmp(r0, r0, vs); // If NaN, set the Z flag. (NaN)
EmitBranch(instr, ne);
} else if (type.IsString()) {
DCHECK(!info()->IsStub());
__ ldr(ip, FieldMemOperand(reg, String::kLengthOffset));
__ cmp(ip, Operand::Zero());
EmitBranch(instr, ne);
} else {
ToBooleanStub::Types expected = instr->hydrogen()->expected_input_types();
// Avoid deopts in the case where we've never executed this path before.
if (expected.IsEmpty()) expected = ToBooleanStub::Types::Generic();
if (expected.Contains(ToBooleanStub::UNDEFINED)) {
// undefined -> false.
__ CompareRoot(reg, Heap::kUndefinedValueRootIndex);
__ b(eq, instr->FalseLabel(chunk_));
}
if (expected.Contains(ToBooleanStub::BOOLEAN)) {
// Boolean -> its value.
__ CompareRoot(reg, Heap::kTrueValueRootIndex);
__ b(eq, instr->TrueLabel(chunk_));
__ CompareRoot(reg, Heap::kFalseValueRootIndex);
__ b(eq, instr->FalseLabel(chunk_));
}
if (expected.Contains(ToBooleanStub::NULL_TYPE)) {
// 'null' -> false.
__ CompareRoot(reg, Heap::kNullValueRootIndex);
__ b(eq, instr->FalseLabel(chunk_));
}
if (expected.Contains(ToBooleanStub::SMI)) {
// Smis: 0 -> false, all other -> true.
__ cmp(reg, Operand::Zero());
__ b(eq, instr->FalseLabel(chunk_));
__ JumpIfSmi(reg, instr->TrueLabel(chunk_));
} else if (expected.NeedsMap()) {
// If we need a map later and have a Smi -> deopt.
__ SmiTst(reg);
DeoptimizeIf(eq, instr, Deoptimizer::kSmi);
}
const Register map = scratch0();
if (expected.NeedsMap()) {
__ ldr(map, FieldMemOperand(reg, HeapObject::kMapOffset));
if (expected.CanBeUndetectable()) {
// Undetectable -> false.
__ ldrb(ip, FieldMemOperand(map, Map::kBitFieldOffset));
__ tst(ip, Operand(1 << Map::kIsUndetectable));
__ b(ne, instr->FalseLabel(chunk_));
}
}
if (expected.Contains(ToBooleanStub::SPEC_OBJECT)) {
// spec object -> true.
__ CompareInstanceType(map, ip, FIRST_SPEC_OBJECT_TYPE);
__ b(ge, instr->TrueLabel(chunk_));
}
if (expected.Contains(ToBooleanStub::STRING)) {
// String value -> false iff empty.
Label not_string;
__ CompareInstanceType(map, ip, FIRST_NONSTRING_TYPE);
__ b(ge, &not_string);
__ ldr(ip, FieldMemOperand(reg, String::kLengthOffset));
__ cmp(ip, Operand::Zero());
__ b(ne, instr->TrueLabel(chunk_));
__ b(instr->FalseLabel(chunk_));
__ bind(&not_string);
}
if (expected.Contains(ToBooleanStub::SYMBOL)) {
// Symbol value -> true.
__ CompareInstanceType(map, ip, SYMBOL_TYPE);
__ b(eq, instr->TrueLabel(chunk_));
}
if (expected.Contains(ToBooleanStub::HEAP_NUMBER)) {
// heap number -> false iff +0, -0, or NaN.
DwVfpRegister dbl_scratch = double_scratch0();
Label not_heap_number;
__ CompareRoot(map, Heap::kHeapNumberMapRootIndex);
__ b(ne, &not_heap_number);
__ vldr(dbl_scratch, FieldMemOperand(reg, HeapNumber::kValueOffset));
__ VFPCompareAndSetFlags(dbl_scratch, 0.0);
__ cmp(r0, r0, vs); // NaN -> false.
__ b(eq, instr->FalseLabel(chunk_)); // +0, -0 -> false.
__ b(instr->TrueLabel(chunk_));
__ bind(&not_heap_number);
}
if (!expected.IsGeneric()) {
// We've seen something for the first time -> deopt.
// This can only happen if we are not generic already.
DeoptimizeIf(al, instr, Deoptimizer::kUnexpectedObject);
}
}
}
}
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 = 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 operands as doubles and load the
// resulting flags into the normal status register.
__ VFPCompareAndSetFlags(ToDoubleRegister(left), ToDoubleRegister(right));
// If a NaN is involved, i.e. the result is unordered (V set),
// jump to false block label.
__ b(vs, instr->FalseLabel(chunk_));
} else {
if (right->IsConstantOperand()) {
int32_t value = ToInteger32(LConstantOperand::cast(right));
if (instr->hydrogen_value()->representation().IsSmi()) {
__ cmp(ToRegister(left), Operand(Smi::FromInt(value)));
} else {
__ cmp(ToRegister(left), Operand(value));
}
} else if (left->IsConstantOperand()) {
int32_t value = ToInteger32(LConstantOperand::cast(left));
if (instr->hydrogen_value()->representation().IsSmi()) {
__ cmp(ToRegister(right), Operand(Smi::FromInt(value)));
} else {
__ cmp(ToRegister(right), Operand(value));
}
// We commuted the operands, so commute the condition.
cond = CommuteCondition(cond);
} else {
__ cmp(ToRegister(left), ToRegister(right));
}
}
EmitBranch(instr, cond);
}
}
void LCodeGen::DoCmpObjectEqAndBranch(LCmpObjectEqAndBranch* instr) {
Register left = ToRegister(instr->left());
Register right = ToRegister(instr->right());
__ cmp(left, Operand(right));
EmitBranch(instr, eq);
}
void LCodeGen::DoCmpHoleAndBranch(LCmpHoleAndBranch* instr) {
if (instr->hydrogen()->representation().IsTagged()) {
Register input_reg = ToRegister(instr->object());
__ mov(ip, Operand(factory()->the_hole_value()));
__ cmp(input_reg, ip);
EmitBranch(instr, eq);
return;
}
DwVfpRegister input_reg = ToDoubleRegister(instr->object());
__ VFPCompareAndSetFlags(input_reg, input_reg);
EmitFalseBranch(instr, vc);
Register scratch = scratch0();
__ VmovHigh(scratch, input_reg);
__ cmp(scratch, Operand(kHoleNanUpper32));
EmitBranch(instr, eq);
}
void LCodeGen::DoCompareMinusZeroAndBranch(LCompareMinusZeroAndBranch* instr) {
Representation rep = instr->hydrogen()->value()->representation();
DCHECK(!rep.IsInteger32());
Register scratch = ToRegister(instr->temp());
if (rep.IsDouble()) {
DwVfpRegister value = ToDoubleRegister(instr->value());
__ VFPCompareAndSetFlags(value, 0.0);
EmitFalseBranch(instr, ne);
__ VmovHigh(scratch, value);
__ cmp(scratch, Operand(0x80000000));
} else {
Register value = ToRegister(instr->value());
__ CheckMap(value,
scratch,
Heap::kHeapNumberMapRootIndex,
instr->FalseLabel(chunk()),
DO_SMI_CHECK);
__ ldr(scratch, FieldMemOperand(value, HeapNumber::kExponentOffset));
__ ldr(ip, FieldMemOperand(value, HeapNumber::kMantissaOffset));
__ cmp(scratch, Operand(0x80000000));
__ cmp(ip, Operand(0x00000000), eq);
}
EmitBranch(instr, eq);
}
Condition LCodeGen::EmitIsObject(Register input,
Register temp1,
Label* is_not_object,
Label* is_object) {
Register temp2 = scratch0();
__ JumpIfSmi(input, is_not_object);
__ LoadRoot(temp2, Heap::kNullValueRootIndex);
__ cmp(input, temp2);
__ b(eq, is_object);
// Load map.
__ ldr(temp1, FieldMemOperand(input, HeapObject::kMapOffset));
// Undetectable objects behave like undefined.
__ ldrb(temp2, FieldMemOperand(temp1, Map::kBitFieldOffset));
__ tst(temp2, Operand(1 << Map::kIsUndetectable));
__ b(ne, is_not_object);
// Load instance type and check that it is in object type range.
__ ldrb(temp2, FieldMemOperand(temp1, Map::kInstanceTypeOffset));
__ cmp(temp2, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
__ b(lt, is_not_object);
__ cmp(temp2, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE));
return le;
}
void LCodeGen::DoIsObjectAndBranch(LIsObjectAndBranch* instr) {
Register reg = ToRegister(instr->value());
Register temp1 = ToRegister(instr->temp());
Condition true_cond =
EmitIsObject(reg, temp1,
instr->FalseLabel(chunk_), instr->TrueLabel(chunk_));
EmitBranch(instr, true_cond);
}
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);
}
__ CompareObjectType(input, temp1, temp1, FIRST_NONSTRING_TYPE);
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);
}
void LCodeGen::DoIsSmiAndBranch(LIsSmiAndBranch* instr) {
Register input_reg = EmitLoadRegister(instr->value(), ip);
__ SmiTst(input_reg);
EmitBranch(instr, eq);
}
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_));
}
__ ldr(temp, FieldMemOperand(input, HeapObject::kMapOffset));
__ ldrb(temp, FieldMemOperand(temp, Map::kBitFieldOffset));
__ tst(temp, Operand(1 << Map::kIsUndetectable));
EmitBranch(instr, ne);
}
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));
Token::Value op = instr->op();
Handle<Code> ic = CodeFactory::CompareIC(isolate(), op).code();
CallCode(ic, RelocInfo::CODE_TARGET, instr);
// This instruction also signals no smi code inlined.
__ cmp(r0, Operand::Zero());
Condition condition = ComputeCompareCondition(op);
EmitBranch(instr, condition);
}
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_));
}
__ CompareObjectType(input, scratch, scratch, TestType(instr->hydrogen()));
EmitBranch(instr, BranchCondition(instr->hydrogen()));
}
void LCodeGen::DoGetCachedArrayIndex(LGetCachedArrayIndex* instr) {
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
__ AssertString(input);
__ ldr(result, FieldMemOperand(input, String::kHashFieldOffset));
__ IndexFromHash(result, result);
}
void LCodeGen::DoHasCachedArrayIndexAndBranch(
LHasCachedArrayIndexAndBranch* instr) {
Register input = ToRegister(instr->value());
Register scratch = scratch0();
__ ldr(scratch,
FieldMemOperand(input, String::kHashFieldOffset));
__ tst(scratch, Operand(String::kContainsCachedArrayIndexMask));
EmitBranch(instr, eq);
}
// 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);
if (String::Equals(isolate()->factory()->Function_string(), class_name)) {
// Assuming the following assertions, we can use the same compares to test
// for both being a function type and being in the object type range.
STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
STATIC_ASSERT(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE ==
FIRST_SPEC_OBJECT_TYPE + 1);
STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE ==
LAST_SPEC_OBJECT_TYPE - 1);
STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE);
__ CompareObjectType(input, temp, temp2, FIRST_SPEC_OBJECT_TYPE);
__ b(lt, is_false);
__ b(eq, is_true);
__ cmp(temp2, Operand(LAST_SPEC_OBJECT_TYPE));
__ b(eq, is_true);
} else {
// Faster code path to avoid two compares: subtract lower bound from the
// actual type and do a signed compare with the width of the type range.
__ ldr(temp, FieldMemOperand(input, HeapObject::kMapOffset));
__ ldrb(temp2, FieldMemOperand(temp, Map::kInstanceTypeOffset));
__ sub(temp2, temp2, Operand(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
__ cmp(temp2, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE -
FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
__ b(gt, is_false);
}
// 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 = ip;
__ GetMapConstructor(temp, temp, temp2, instance_type);
// Objects with a non-function constructor have class 'Object'.
__ cmp(instance_type, Operand(JS_FUNCTION_TYPE));
if (class_name->IsOneByteEqualTo(STATIC_CHAR_VECTOR("Object"))) {
__ b(ne, is_true);
} else {
__ b(ne, is_false);
}
// temp now contains the constructor function. Grab the
// instance class name from there.
__ ldr(temp, FieldMemOperand(temp, JSFunction::kSharedFunctionInfoOffset));
__ ldr(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.
__ cmp(temp, Operand(class_name));
// End with the answer in flags.
}
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);
}
void LCodeGen::DoCmpMapAndBranch(LCmpMapAndBranch* instr) {
Register reg = ToRegister(instr->value());
Register temp = ToRegister(instr->temp());
__ ldr(temp, FieldMemOperand(reg, HeapObject::kMapOffset));
__ cmp(temp, Operand(instr->map()));
EmitBranch(instr, eq);
}
void LCodeGen::DoInstanceOf(LInstanceOf* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->left()).is(r0)); // Object is in r0.
DCHECK(ToRegister(instr->right()).is(r1)); // Function is in r1.
InstanceofStub stub(isolate(), InstanceofStub::kArgsInRegisters);
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
__ cmp(r0, Operand::Zero());
__ mov(r0, Operand(factory()->false_value()), LeaveCC, ne);
__ mov(r0, Operand(factory()->true_value()), LeaveCC, eq);
}
void LCodeGen::DoInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr) {
class DeferredInstanceOfKnownGlobal FINAL : public LDeferredCode {
public:
DeferredInstanceOfKnownGlobal(LCodeGen* codegen,
LInstanceOfKnownGlobal* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() OVERRIDE {
codegen()->DoDeferredInstanceOfKnownGlobal(instr_, &map_check_,
&load_bool_);
}
LInstruction* instr() OVERRIDE { return instr_; }
Label* map_check() { return &map_check_; }
Label* load_bool() { return &load_bool_; }
private:
LInstanceOfKnownGlobal* instr_;
Label map_check_;
Label load_bool_;
};
DeferredInstanceOfKnownGlobal* deferred;
deferred = new(zone()) DeferredInstanceOfKnownGlobal(this, instr);
Label done, false_result;
Register object = ToRegister(instr->value());
Register temp = ToRegister(instr->temp());
Register result = ToRegister(instr->result());
// A Smi is not instance of anything.
__ JumpIfSmi(object, &false_result);
// This is the inlined call site instanceof cache. The two occurences of the
// hole value will be patched to the last map/result pair generated by the
// instanceof stub.
Label cache_miss;
Register map = temp;
__ ldr(map, FieldMemOperand(object, HeapObject::kMapOffset));
{
// Block constant pool emission to ensure the positions of instructions are
// as expected by the patcher. See InstanceofStub::Generate().
Assembler::BlockConstPoolScope block_const_pool(masm());
__ bind(deferred->map_check()); // Label for calculating code patching.
// We use Factory::the_hole_value() on purpose instead of loading from the
// root array to force relocation to be able to later patch with
// the cached map.
Handle<Cell> cell = factory()->NewCell(factory()->the_hole_value());
__ mov(ip, Operand(cell));
__ ldr(ip, FieldMemOperand(ip, Cell::kValueOffset));
__ cmp(map, Operand(ip));
__ b(ne, &cache_miss);
__ bind(deferred->load_bool()); // Label for calculating code patching.
// We use Factory::the_hole_value() on purpose instead of loading from the
// root array to force relocation to be able to later patch
// with true or false.
__ mov(result, Operand(factory()->the_hole_value()));
}
__ b(&done);
// The inlined call site cache did not match. Check null and string before
// calling the deferred code.
__ bind(&cache_miss);
// Null is not instance of anything.
__ LoadRoot(ip, Heap::kNullValueRootIndex);
__ cmp(object, Operand(ip));
__ b(eq, &false_result);
// String values is not instance of anything.
Condition is_string = masm_->IsObjectStringType(object, temp);
__ b(is_string, &false_result);
// Go to the deferred code.
__ b(deferred->entry());
__ bind(&false_result);
__ LoadRoot(result, Heap::kFalseValueRootIndex);
// Here result has either true or false. Deferred code also produces true or
// false object.
__ bind(deferred->exit());
__ bind(&done);
}
void LCodeGen::DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
Label* map_check,
Label* bool_load) {
InstanceofStub::Flags flags = InstanceofStub::kNoFlags;
flags = static_cast<InstanceofStub::Flags>(
flags | InstanceofStub::kArgsInRegisters);
flags = static_cast<InstanceofStub::Flags>(
flags | InstanceofStub::kCallSiteInlineCheck);
flags = static_cast<InstanceofStub::Flags>(
flags | InstanceofStub::kReturnTrueFalseObject);
InstanceofStub stub(isolate(), flags);
PushSafepointRegistersScope scope(this);
LoadContextFromDeferred(instr->context());
__ Move(InstanceofStub::right(), instr->function());
int call_size = CallCodeSize(stub.GetCode(), RelocInfo::CODE_TARGET);
int additional_delta = (call_size / Assembler::kInstrSize) + 4;
// Make sure that code size is predicable, since we use specific constants
// offsets in the code to find embedded values..
PredictableCodeSizeScope predictable(
masm_, (additional_delta + 1) * Assembler::kInstrSize);
// Make sure we don't emit any additional entries in the constant pool before
// the call to ensure that the CallCodeSize() calculated the correct number of
// instructions for the constant pool load.
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm_);
int map_check_delta =
masm_->InstructionsGeneratedSince(map_check) + additional_delta;
int bool_load_delta =
masm_->InstructionsGeneratedSince(bool_load) + additional_delta;
Label before_push_delta;
__ bind(&before_push_delta);
__ BlockConstPoolFor(additional_delta);
// r5 is used to communicate the offset to the location of the map check.
__ mov(r5, Operand(map_check_delta * kPointerSize));
// r6 is used to communicate the offset to the location of the bool load.
__ mov(r6, Operand(bool_load_delta * kPointerSize));
// The mov above can generate one or two instructions. The delta was
// computed for two instructions, so we need to pad here in case of one
// instruction.
while (masm_->InstructionsGeneratedSince(&before_push_delta) != 4) {
__ nop();
}
}
CallCodeGeneric(stub.GetCode(),
RelocInfo::CODE_TARGET,
instr,
RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
LEnvironment* env = instr->GetDeferredLazyDeoptimizationEnvironment();
safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
// Put the result value (r0) into the result register slot and
// restore all registers.
__ StoreToSafepointRegisterSlot(r0, ToRegister(instr->result()));
}
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);
// This instruction also signals no smi code inlined.
__ cmp(r0, Operand::Zero());
Condition condition = ComputeCompareCondition(op);
__ LoadRoot(ToRegister(instr->result()),
Heap::kTrueValueRootIndex,
condition);
__ LoadRoot(ToRegister(instr->result()),
Heap::kFalseValueRootIndex,
NegateCondition(condition));
}
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 r0. 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(r0);
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ CallRuntime(Runtime::kTraceExit, 1);
}
if (info()->saves_caller_doubles()) {
RestoreCallerDoubles();
}
int no_frame_start = -1;
if (NeedsEagerFrame()) {
no_frame_start = masm_->LeaveFrame(StackFrame::JAVA_SCRIPT);
}
{ ConstantPoolUnavailableScope constant_pool_unavailable(masm());
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) {
__ add(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);
__ add(sp, sp, Operand(reg, LSL, kPointerSizeLog2));
}
__ Jump(lr);
if (no_frame_start != -1) {
info_->AddNoFrameRange(no_frame_start, masm_->pc_offset());
}
}
}
template <class T>
void LCodeGen::EmitVectorLoadICRegisters(T* instr) {
DCHECK(FLAG_vector_ics);
Register vector_register = ToRegister(instr->temp_vector());
Register slot_register = VectorLoadICDescriptor::SlotRegister();
DCHECK(vector_register.is(VectorLoadICDescriptor::VectorRegister()));
DCHECK(slot_register.is(r0));
AllowDeferredHandleDereference vector_structure_check;
Handle<TypeFeedbackVector> vector = instr->hydrogen()->feedback_vector();
__ Move(vector_register, vector);
// No need to allocate this register.
FeedbackVectorICSlot slot = instr->hydrogen()->slot();
int index = vector->GetIndex(slot);
__ mov(slot_register, Operand(Smi::FromInt(index)));
}
void LCodeGen::DoLoadGlobalGeneric(LLoadGlobalGeneric* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->global_object())
.is(LoadDescriptor::ReceiverRegister()));
DCHECK(ToRegister(instr->result()).is(r0));
__ mov(LoadDescriptor::NameRegister(), Operand(instr->name()));
if (FLAG_vector_ics) {
EmitVectorLoadICRegisters<LLoadGlobalGeneric>(instr);
}
ContextualMode mode = instr->for_typeof() ? NOT_CONTEXTUAL : CONTEXTUAL;
Handle<Code> ic = CodeFactory::LoadICInOptimizedCode(isolate(), mode,
PREMONOMORPHIC).code();
CallCode(ic, RelocInfo::CODE_TARGET, instr);
}
void LCodeGen::DoLoadContextSlot(LLoadContextSlot* instr) {
Register context = ToRegister(instr->context());
Register result = ToRegister(instr->result());
__ ldr(result, ContextOperand(context, instr->slot_index()));
if (instr->hydrogen()->RequiresHoleCheck()) {
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ cmp(result, ip);
if (instr->hydrogen()->DeoptimizesOnHole()) {
DeoptimizeIf(eq, instr, Deoptimizer::kHole);
} else {
__ mov(result, Operand(factory()->undefined_value()), LeaveCC, eq);
}
}
}
void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
Register context = ToRegister(instr->context());
Register value = ToRegister(instr->value());
Register scratch = scratch0();
MemOperand target = ContextOperand(context, instr->slot_index());
Label skip_assignment;
if (instr->hydrogen()->RequiresHoleCheck()) {
__ ldr(scratch, target);
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ cmp(scratch, ip);
if (instr->hydrogen()->DeoptimizesOnHole()) {
DeoptimizeIf(eq, instr, Deoptimizer::kHole);
} else {
__ b(ne, &skip_assignment);
}
}
__ str(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,
scratch,
GetLinkRegisterState(),
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()) {
DwVfpRegister result = ToDoubleRegister(instr->result());
__ vldr(result, FieldMemOperand(object, offset));
return;
}
Register result = ToRegister(instr->result());
if (!access.IsInobject()) {
__ ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
object = result;
}
MemOperand operand = FieldMemOperand(object, offset);
__ Load(result, operand, access.representation());
}
void LCodeGen::DoLoadNamedGeneric(LLoadNamedGeneric* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->object()).is(LoadDescriptor::ReceiverRegister()));
DCHECK(ToRegister(instr->result()).is(r0));
// Name is always in r2.
__ mov(LoadDescriptor::NameRegister(), Operand(instr->name()));
if (FLAG_vector_ics) {
EmitVectorLoadICRegisters<LLoadNamedGeneric>(instr);
}
Handle<Code> ic = CodeFactory::LoadICInOptimizedCode(
isolate(), NOT_CONTEXTUAL,
instr->hydrogen()->initialization_state()).code();
CallCode(ic, RelocInfo::CODE_TARGET, instr, NEVER_INLINE_TARGET_ADDRESS);
}
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.
__ ldr(result,
FieldMemOperand(function, JSFunction::kPrototypeOrInitialMapOffset));
// Check that the function has a prototype or an initial map.
__ LoadRoot(ip, Heap::kTheHoleValueRootIndex);
__ cmp(result, ip);
DeoptimizeIf(eq, instr, Deoptimizer::kHole);
// If the function does not have an initial map, we're done.
Label done;
__ CompareObjectType(result, scratch, scratch, MAP_TYPE);
__ b(ne, &done);
// Get the prototype from the initial map.
__ ldr(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;
__ ldr(result, MemOperand(arguments, index * kPointerSize));
} else {
Register index = ToRegister(instr->index());
__ rsb(result, index, Operand(const_length + 1));
__ ldr(result, MemOperand(arguments, result, LSL, kPointerSizeLog2));
}
} 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) {
__ sub(result, length, Operand(loc));
__ ldr(result, MemOperand(arguments, result, LSL, kPointerSizeLog2));
} else {
__ ldr(result, MemOperand(arguments, length, LSL, kPointerSizeLog2));
}
} else {
Register length = ToRegister(instr->length());
Register index = ToRegister(instr->index());
__ sub(result, length, index);
__ add(result, result, Operand(1));
__ ldr(result, MemOperand(arguments, result, LSL, kPointerSizeLog2));
}
}
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) : element_size_shift;
int base_offset = instr->base_offset();
if (elements_kind == EXTERNAL_FLOAT32_ELEMENTS ||
elements_kind == FLOAT32_ELEMENTS ||
elements_kind == EXTERNAL_FLOAT64_ELEMENTS ||
elements_kind == FLOAT64_ELEMENTS) {
int base_offset = instr->base_offset();
DwVfpRegister result = ToDoubleRegister(instr->result());
Operand operand = key_is_constant
? Operand(constant_key << element_size_shift)
: Operand(key, LSL, shift_size);
__ add(scratch0(), external_pointer, operand);
if (elements_kind == EXTERNAL_FLOAT32_ELEMENTS ||
elements_kind == FLOAT32_ELEMENTS) {
__ vldr(double_scratch0().low(), scratch0(), base_offset);
__ vcvt_f64_f32(result, double_scratch0().low());
} else { // i.e. elements_kind == EXTERNAL_DOUBLE_ELEMENTS
__ vldr(result, 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 EXTERNAL_INT8_ELEMENTS:
case INT8_ELEMENTS:
__ ldrsb(result, mem_operand);
break;
case EXTERNAL_UINT8_CLAMPED_ELEMENTS:
case EXTERNAL_UINT8_ELEMENTS:
case UINT8_ELEMENTS:
case UINT8_CLAMPED_ELEMENTS:
__ ldrb(result, mem_operand);
break;
case EXTERNAL_INT16_ELEMENTS:
case INT16_ELEMENTS:
__ ldrsh(result, mem_operand);
break;
case EXTERNAL_UINT16_ELEMENTS:
case UINT16_ELEMENTS:
__ ldrh(result, mem_operand);
break;
case EXTERNAL_INT32_ELEMENTS:
case INT32_ELEMENTS:
__ ldr(result, mem_operand);
break;
case EXTERNAL_UINT32_ELEMENTS:
case UINT32_ELEMENTS:
__ ldr(result, mem_operand);
if (!instr->hydrogen()->CheckFlag(HInstruction::kUint32)) {
__ cmp(result, Operand(0x80000000));
DeoptimizeIf(cs, instr, Deoptimizer::kNegativeValue);
}
break;
case FLOAT32_ELEMENTS:
case FLOAT64_ELEMENTS:
case EXTERNAL_FLOAT32_ELEMENTS:
case EXTERNAL_FLOAT64_ELEMENTS:
case FAST_HOLEY_DOUBLE_ELEMENTS:
case FAST_HOLEY_ELEMENTS:
case FAST_HOLEY_SMI_ELEMENTS:
case FAST_DOUBLE_ELEMENTS:
case FAST_ELEMENTS:
case FAST_SMI_ELEMENTS:
case DICTIONARY_ELEMENTS:
case SLOPPY_ARGUMENTS_ELEMENTS:
UNREACHABLE();
break;
}
}
}
void LCodeGen::DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr) {
Register elements = ToRegister(instr->elements());
bool key_is_constant = instr->key()->IsConstantOperand();
Register key = no_reg;
DwVfpRegister 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;
}
__ add(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) : element_size_shift;
__ add(scratch, scratch, Operand(key, LSL, shift_size));
}
__ vldr(result, scratch, 0);
if (instr->hydrogen()->RequiresHoleCheck()) {
__ ldr(scratch, MemOperand(scratch, sizeof(kHoleNanLower32)));
__ cmp(scratch, Operand(kHoleNanUpper32));
DeoptimizeIf(eq, instr, Deoptimizer::kHole);
}
}
void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
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()) {
__ add(scratch, elements, Operand::PointerOffsetFromSmiKey(key));
} else {
__ add(scratch, elements, Operand(key, LSL, kPointerSizeLog2));
}
}
__ ldr(result, MemOperand(store_base, offset));
// Check for the hole value.
if (instr->hydrogen()->RequiresHoleCheck()) {
if (IsFastSmiElementsKind(instr->hydrogen()->elements_kind())) {
__ SmiTst(result);
DeoptimizeIf(ne, instr, Deoptimizer::kNotASmi);
} else {
__ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
__ cmp(result, scratch);
DeoptimizeIf(eq, instr, Deoptimizer::kHole);
}
}
}
void LCodeGen::DoLoadKeyed(LLoadKeyed* instr) {
if (instr->is_typed_elements()) {
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) {
return MemOperand(base, key, LSL, shift_size);
} else {
DCHECK_EQ(-1, shift_size);
return MemOperand(base, key, LSR, 1);
}
}
if (shift_size >= 0) {
__ add(scratch0(), base, Operand(key, LSL, shift_size));
return MemOperand(scratch0(), base_offset);
} else {
DCHECK_EQ(-1, shift_size);
__ add(scratch0(), base, Operand(key, ASR, 1));
return MemOperand(scratch0(), base_offset);
}
}
void LCodeGen::DoLoadKeyedGeneric(LLoadKeyedGeneric* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->object()).is(LoadDescriptor::ReceiverRegister()));
DCHECK(ToRegister(instr->key()).is(LoadDescriptor::NameRegister()));
if (FLAG_vector_ics) {
EmitVectorLoadICRegisters<LLoadKeyedGeneric>(instr);
}
Handle<Code> ic =
CodeFactory::KeyedLoadICInOptimizedCode(
isolate(), instr->hydrogen()->initialization_state()).code();
CallCode(ic, RelocInfo::CODE_TARGET, instr, NEVER_INLINE_TARGET_ADDRESS);
}
void LCodeGen::DoArgumentsElements(LArgumentsElements* instr) {
Register scratch = scratch0();
Register result = ToRegister(instr->result());
if (instr->hydrogen()->from_inlined()) {
__ sub(result, sp, Operand(2 * kPointerSize));
} else {
// Check if the calling frame is an arguments adaptor frame.
Label done, adapted;
__ ldr(scratch, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ldr(result, MemOperand(scratch, StandardFrameConstants::kContextOffset));
__ cmp(result, Operand(Smi::FromInt(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.
__ mov(result, fp, LeaveCC, ne);
__ mov(result, scratch, LeaveCC, eq);
}
}
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.
__ cmp(fp, elem);
__ mov(result, Operand(scope()->num_parameters()));
__ b(eq, &done);
// Arguments adaptor frame present. Get argument length from there.
__ ldr(result, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
__ ldr(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.
__ ldr(scratch,
FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
__ ldr(scratch,
FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
int mask = 1 << (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize);
__ tst(scratch, Operand(mask));
__ b(ne, &result_in_receiver);
// Do not transform the receiver to object for builtins.
__ tst(scratch, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
__ b(ne, &result_in_receiver);
}
// Normal function. Replace undefined or null with global receiver.
__ LoadRoot(scratch, Heap::kNullValueRootIndex);
__ cmp(receiver, scratch);
__ b(eq, &global_object);
__ LoadRoot(scratch, Heap::kUndefinedValueRootIndex);
__ cmp(receiver, scratch);
__ b(eq, &global_object);
// Deoptimize if the receiver is not a JS object.
__ SmiTst(receiver);
DeoptimizeIf(eq, instr, Deoptimizer::kSmi);
__ CompareObjectType(receiver, scratch, scratch, FIRST_SPEC_OBJECT_TYPE);
DeoptimizeIf(lt, instr, Deoptimizer::kNotAJavaScriptObject);
__ b(&result_in_receiver);
__ bind(&global_object);
__ ldr(result, FieldMemOperand(function, JSFunction::kContextOffset));
__ ldr(result,
ContextOperand(result, Context::GLOBAL_OBJECT_INDEX));
__ ldr(result, FieldMemOperand(result, GlobalObject::kGlobalProxyOffset));
if (result.is(receiver)) {
__ bind(&result_in_receiver);
} else {
Label result_ok;
__ b(&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(r0)); // Used for parameter count.
DCHECK(function.is(r1)); // Required by InvokeFunction.
DCHECK(ToRegister(instr->result()).is(r0));
// Copy the arguments to this function possibly from the
// adaptor frame below it.
const uint32_t kArgumentsLimit = 1 * KB;
__ cmp(length, Operand(kArgumentsLimit));
DeoptimizeIf(hi, instr, Deoptimizer::kTooManyArguments);
// Push the receiver and use the register to keep the original
// number of arguments.
__ push(receiver);
__ mov(receiver, length);
// The arguments are at a one pointer size offset from elements.
__ add(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.
__ cmp(length, Operand::Zero());
__ b(eq, &invoke);
__ bind(&loop);
__ ldr(scratch, MemOperand(elements, length, LSL, 2));
__ push(scratch);
__ sub(length, length, Operand(1), SetCC);
__ b(ne, &loop);
__ bind(&invoke);
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 r0, as expected
// by InvokeFunction.
ParameterCount actual(receiver);
__ InvokeFunction(function, actual, CALL_FUNCTION, safepoint_generator);
}
void LCodeGen::DoPushArgument(LPushArgument* instr) {
LOperand* argument = instr->value();
if (argument->IsDoubleRegister() || argument->IsDoubleStackSlot()) {
Abort(kDoPushArgumentNotImplementedForDoubleType);
} else {
Register argument_reg = EmitLoadRegister(argument, ip);
__ push(argument_reg);
}
}
void LCodeGen::DoDrop(LDrop* instr) {
__ Drop(instr->count());
}
void LCodeGen::DoThisFunction(LThisFunction* instr) {
Register result = ToRegister(instr->result());
__ ldr(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()) {
__ ldr(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));
__ push(cp); // The context is the first argument.
__ Move(scratch0(), instr->hydrogen()->pairs());
__ push(scratch0());
__ mov(scratch0(), Operand(Smi::FromInt(instr->hydrogen()->flags())));
__ push(scratch0());
CallRuntime(Runtime::kDeclareGlobals, 3, instr);
}
void LCodeGen::CallKnownFunction(Handle<JSFunction> function,
int formal_parameter_count, int arity,
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 = r1;
LPointerMap* pointers = instr->pointer_map();
if (can_invoke_directly) {
// Change context.
__ ldr(cp, FieldMemOperand(function_reg, JSFunction::kContextOffset));
// Set r0 to arguments count if adaption is not needed. Assumes that r0
// is available to write to at this point.
if (dont_adapt_arguments) {
__ mov(r0, Operand(arity));
}
// Invoke function.
__ ldr(ip, FieldMemOperand(function_reg, JSFunction::kCodeEntryOffset));
__ Call(ip);
// Set up deoptimization.
RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT);
} else {
SafepointGenerator generator(this, pointers, Safepoint::kLazyDeopt);
ParameterCount count(arity);
ParameterCount expected(formal_parameter_count);
__ InvokeFunction(function_reg, expected, count, CALL_FUNCTION, 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.
__ ldr(scratch, FieldMemOperand(input, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kHeapNumberMapRootIndex);
__ cmp(scratch, Operand(ip));
DeoptimizeIf(ne, instr, Deoptimizer::kNotAHeapNumber);
Label done;
Register exponent = scratch0();
scratch = no_reg;
__ ldr(exponent, FieldMemOperand(input, HeapNumber::kExponentOffset));
// Check the sign of the argument. If the argument is positive, just
// return it.
__ tst(exponent, Operand(HeapNumber::kSignMask));
// Move the input to the result if necessary.
__ Move(result, input);
__ b(eq, &done);
// 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(r1) ? r0 : r1;
Register tmp2 = input.is(r2) ? r0 : r2;
Register tmp3 = input.is(r3) ? r0 : r3;
Register tmp4 = input.is(r4) ? r0 : r4;
// exponent: floating point exponent value.
Label allocated, slow;
__ LoadRoot(tmp4, Heap::kHeapNumberMapRootIndex);
__ AllocateHeapNumber(tmp1, tmp2, tmp3, tmp4, &slow);
__ b(&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(r0)) __ mov(tmp1, Operand(r0));
// Restore input_reg after call to runtime.
__ LoadFromSafepointRegisterSlot(input, input);
__ ldr(exponent, FieldMemOperand(input, HeapNumber::kExponentOffset));
__ bind(&allocated);
// exponent: floating point exponent value.
// tmp1: allocated heap number.
__ bic(exponent, exponent, Operand(HeapNumber::kSignMask));
__ str(exponent, FieldMemOperand(tmp1, HeapNumber::kExponentOffset));
__ ldr(tmp2, FieldMemOperand(input, HeapNumber::kMantissaOffset));
__ str(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());
__ cmp(input, Operand::Zero());
__ Move(result, input, pl);
// We can make rsb conditional because the previous cmp instruction
// will clear the V (overflow) flag and rsb won't set this flag
// if input is positive.
__ rsb(result, input, Operand::Zero(), SetCC, mi);
// Deoptimize on overflow.
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
}
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()) {
DwVfpRegister input = ToDoubleRegister(instr->value());
DwVfpRegister result = ToDoubleRegister(instr->result());
__ vabs(result, input);
} else if (r.IsSmiOrInteger32()) {
EmitIntegerMathAbs(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.
EmitIntegerMathAbs(instr);
__ bind(deferred->exit());
}
}
void LCodeGen::DoMathFloor(LMathFloor* instr) {
DwVfpRegister input = ToDoubleRegister(instr->value());
Register result = ToRegister(instr->result());
Register input_high = scratch0();
Label done, exact;
__ TryInt32Floor(result, input, input_high, double_scratch0(), &done, &exact);
DeoptimizeIf(al, instr, Deoptimizer::kLostPrecisionOrNaN);
__ bind(&exact);
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
// Test for -0.
__ cmp(result, Operand::Zero());
__ b(ne, &done);
__ cmp(input_high, Operand::Zero());
DeoptimizeIf(mi, instr, Deoptimizer::kMinusZero);
}
__ bind(&done);
}
void LCodeGen::DoMathRound(LMathRound* instr) {
DwVfpRegister input = ToDoubleRegister(instr->value());
Register result = ToRegister(instr->result());
DwVfpRegister double_scratch1 = ToDoubleRegister(instr->temp());
DwVfpRegister input_plus_dot_five = double_scratch1;
Register input_high = scratch0();
DwVfpRegister dot_five = double_scratch0();
Label convert, done;
__ Vmov(dot_five, 0.5, scratch0());
__ vabs(double_scratch1, input);
__ VFPCompareAndSetFlags(double_scratch1, dot_five);
// If input is in [-0.5, -0], the result is -0.
// If input is in [+0, +0.5[, the result is +0.
// If the input is +0.5, the result is 1.
__ b(hi, &convert); // Out of [-0.5, +0.5].
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
__ VmovHigh(input_high, input);
__ cmp(input_high, Operand::Zero());
// [-0.5, -0].
DeoptimizeIf(mi, instr, Deoptimizer::kMinusZero);
}
__ VFPCompareAndSetFlags(input, dot_five);
__ mov(result, Operand(1), LeaveCC, eq); // +0.5.
// Remaining cases: [+0, +0.5[ or [-0.5, +0.5[, depending on
// flag kBailoutOnMinusZero.
__ mov(result, Operand::Zero(), LeaveCC, ne);
__ b(&done);
__ bind(&convert);
__ vadd(input_plus_dot_five, input, dot_five);
// Reuse dot_five (double_scratch0) as we no longer need this value.
__ TryInt32Floor(result, input_plus_dot_five, input_high, double_scratch0(),
&done, &done);
DeoptimizeIf(al, instr, Deoptimizer::kLostPrecisionOrNaN);
__ bind(&done);
}
void LCodeGen::DoMathFround(LMathFround* instr) {
DwVfpRegister input_reg = ToDoubleRegister(instr->value());
DwVfpRegister output_reg = ToDoubleRegister(instr->result());
LowDwVfpRegister scratch = double_scratch0();
__ vcvt_f32_f64(scratch.low(), input_reg);
__ vcvt_f64_f32(output_reg, scratch.low());
}
void LCodeGen::DoMathSqrt(LMathSqrt* instr) {
DwVfpRegister input = ToDoubleRegister(instr->value());
DwVfpRegister result = ToDoubleRegister(instr->result());
__ vsqrt(result, input);
}
void LCodeGen::DoMathPowHalf(LMathPowHalf* instr) {
DwVfpRegister input = ToDoubleRegister(instr->value());
DwVfpRegister result = ToDoubleRegister(instr->result());
DwVfpRegister temp = double_scratch0();
// Note that according to ECMA-262 15.8.2.13:
// Math.pow(-Infinity, 0.5) == Infinity
// Math.sqrt(-Infinity) == NaN
Label done;
__ vmov(temp, -V8_INFINITY, scratch0());
__ VFPCompareAndSetFlags(input, temp);
__ vneg(result, temp, eq);
__ b(&done, eq);
// Add +0 to convert -0 to +0.
__ vadd(result, input, kDoubleRegZero);
__ vsqrt(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(d1));
DCHECK(!instr->right()->IsRegister() ||
ToRegister(instr->right()).is(tagged_exponent));
DCHECK(ToDoubleRegister(instr->left()).is(d0));
DCHECK(ToDoubleRegister(instr->result()).is(d2));
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(!r6.is(tagged_exponent));
__ ldr(r6, FieldMemOperand(tagged_exponent, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kHeapNumberMapRootIndex);
__ cmp(r6, Operand(ip));
DeoptimizeIf(ne, instr, Deoptimizer::kNotAHeapNumber);
__ 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::DoMathExp(LMathExp* instr) {
DwVfpRegister input = ToDoubleRegister(instr->value());
DwVfpRegister result = ToDoubleRegister(instr->result());
DwVfpRegister double_scratch1 = ToDoubleRegister(instr->double_temp());
DwVfpRegister double_scratch2 = double_scratch0();
Register temp1 = ToRegister(instr->temp1());
Register temp2 = ToRegister(instr->temp2());
MathExpGenerator::EmitMathExp(
masm(), input, result, double_scratch1, double_scratch2,
temp1, temp2, scratch0());
}
void LCodeGen::DoMathLog(LMathLog* instr) {
__ PrepareCallCFunction(0, 1, scratch0());
__ MovToFloatParameter(ToDoubleRegister(instr->value()));
__ CallCFunction(ExternalReference::math_log_double_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::DoInvokeFunction(LInvokeFunction* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->function()).is(r1));
DCHECK(instr->HasPointerMap());
Handle<JSFunction> known_function = instr->hydrogen()->known_function();
if (known_function.is_null()) {
LPointerMap* pointers = instr->pointer_map();
SafepointGenerator generator(this, pointers, Safepoint::kLazyDeopt);
ParameterCount count(instr->arity());
__ InvokeFunction(r1, count, CALL_FUNCTION, generator);
} else {
CallKnownFunction(known_function,
instr->hydrogen()->formal_parameter_count(),
instr->arity(), instr);
}
}
void LCodeGen::DoTailCallThroughMegamorphicCache(
LTailCallThroughMegamorphicCache* instr) {
Register receiver = ToRegister(instr->receiver());
Register name = ToRegister(instr->name());
DCHECK(receiver.is(LoadDescriptor::ReceiverRegister()));
DCHECK(name.is(LoadDescriptor::NameRegister()));
DCHECK(receiver.is(r1));
DCHECK(name.is(r2));
Register scratch = r4;
Register extra = r5;
Register extra2 = r6;
Register extra3 = r9;
#ifdef DEBUG
Register slot = FLAG_vector_ics ? ToRegister(instr->slot()) : no_reg;
Register vector = FLAG_vector_ics ? ToRegister(instr->vector()) : no_reg;
DCHECK(!FLAG_vector_ics ||
!AreAliased(slot, vector, scratch, extra, extra2, extra3));
#endif
// Important for the tail-call.
bool must_teardown_frame = NeedsEagerFrame();
if (!instr->hydrogen()->is_just_miss()) {
DCHECK(!instr->hydrogen()->is_keyed_load());
// The probe will tail call to a handler if found.
isolate()->stub_cache()->GenerateProbe(
masm(), Code::LOAD_IC, instr->hydrogen()->flags(), must_teardown_frame,
receiver, name, scratch, extra, extra2, extra3);
}
// Tail call to miss if we ended up here.
if (must_teardown_frame) __ LeaveFrame(StackFrame::INTERNAL);
if (instr->hydrogen()->is_keyed_load()) {
KeyedLoadIC::GenerateMiss(masm());
} else {
LoadIC::GenerateMiss(masm());
}
}
void LCodeGen::DoCallWithDescriptor(LCallWithDescriptor* instr) {
DCHECK(ToRegister(instr->result()).is(r0));
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());
// Make sure we don't emit any additional entries in the constant pool
// before the call to ensure that the CallCodeSize() calculated the
// correct
// number of instructions for the constant pool load.
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm_);
__ add(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));
PlatformInterfaceDescriptor* call_descriptor =
instr->descriptor().platform_specific_descriptor();
__ Call(code, RelocInfo::CODE_TARGET, TypeFeedbackId::None(), al,
call_descriptor->storage_mode());
} else {
DCHECK(instr->target()->IsRegister());
Register target = ToRegister(instr->target());
generator.BeforeCall(__ CallSize(target));
// Make sure we don't emit any additional entries in the constant pool
// before the call to ensure that the CallCodeSize() calculated the
// correct
// number of instructions for the constant pool load.
{
ConstantPoolUnavailableScope constant_pool_unavailable(masm_);
__ add(target, target, Operand(Code::kHeaderSize - kHeapObjectTag));
}
__ Call(target);
}
generator.AfterCall();
}
}
void LCodeGen::DoCallJSFunction(LCallJSFunction* instr) {
DCHECK(ToRegister(instr->function()).is(r1));
DCHECK(ToRegister(instr->result()).is(r0));
if (instr->hydrogen()->pass_argument_count()) {
__ mov(r0, Operand(instr->arity()));
}
// Change context.
__ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
// Load the code entry address
__ ldr(ip, FieldMemOperand(r1, JSFunction::kCodeEntryOffset));
__ Call(ip);
RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT);
}
void LCodeGen::DoCallFunction(LCallFunction* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->function()).is(r1));
DCHECK(ToRegister(instr->result()).is(r0));
int arity = instr->arity();
CallFunctionFlags flags = instr->hydrogen()->function_flags();
if (instr->hydrogen()->HasVectorAndSlot()) {
Register slot_register = ToRegister(instr->temp_slot());
Register vector_register = ToRegister(instr->temp_vector());
DCHECK(slot_register.is(r3));
DCHECK(vector_register.is(r2));
AllowDeferredHandleDereference vector_structure_check;
Handle<TypeFeedbackVector> vector = instr->hydrogen()->feedback_vector();
int index = vector->GetIndex(instr->hydrogen()->slot());
__ Move(vector_register, vector);
__ mov(slot_register, Operand(Smi::FromInt(index)));
CallICState::CallType call_type =
(flags & CALL_AS_METHOD) ? CallICState::METHOD : CallICState::FUNCTION;
Handle<Code> ic =
CodeFactory::CallICInOptimizedCode(isolate(), arity, call_type).code();
CallCode(ic, RelocInfo::CODE_TARGET, instr);
} else {
CallFunctionStub stub(isolate(), arity, flags);
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
}
}
void LCodeGen::DoCallNew(LCallNew* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->constructor()).is(r1));
DCHECK(ToRegister(instr->result()).is(r0));
__ mov(r0, Operand(instr->arity()));
// No cell in r2 for construct type feedback in optimized code
__ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
CallConstructStub stub(isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
CallCode(stub.GetCode(), RelocInfo::CONSTRUCT_CALL, instr);
}
void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->constructor()).is(r1));
DCHECK(ToRegister(instr->result()).is(r0));
__ mov(r0, Operand(instr->arity()));
__ LoadRoot(r2, Heap::kUndefinedValueRootIndex);
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::CONSTRUCT_CALL, 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
__ ldr(r5, MemOperand(sp, 0));
__ cmp(r5, Operand::Zero());
__ b(eq, &packed_case);
ElementsKind holey_kind = GetHoleyElementsKind(kind);
ArraySingleArgumentConstructorStub stub(isolate(),
holey_kind,
override_mode);
CallCode(stub.GetCode(), RelocInfo::CONSTRUCT_CALL, instr);
__ jmp(&done);
__ bind(&packed_case);
}
ArraySingleArgumentConstructorStub stub(isolate(), kind, override_mode);
CallCode(stub.GetCode(), RelocInfo::CONSTRUCT_CALL, instr);
__ bind(&done);
} else {
ArrayNArgumentsConstructorStub stub(isolate(), kind, override_mode);
CallCode(stub.GetCode(), RelocInfo::CONSTRUCT_CALL, 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());
__ add(code_object, code_object, Operand(Code::kHeaderSize - kHeapObjectTag));
__ str(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());
__ add(result, base, Operand(ToInteger32(offset)));
} else {
Register offset = ToRegister(instr->offset());
__ add(result, base, offset);
}
}
void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
Representation representation = instr->representation();
Register object = ToRegister(instr->object());
Register scratch = 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 (representation.IsDouble()) {
DCHECK(access.IsInobject());
DCHECK(!instr->hydrogen()->has_transition());
DCHECK(!instr->hydrogen()->NeedsWriteBarrier());
DwVfpRegister value = ToDoubleRegister(instr->value());
__ vstr(value, FieldMemOperand(object, offset));
return;
}
if (instr->hydrogen()->has_transition()) {
Handle<Map> transition = instr->hydrogen()->transition_map();
AddDeprecationDependency(transition);
__ mov(scratch, Operand(transition));
__ str(scratch, FieldMemOperand(object, HeapObject::kMapOffset));
if (instr->hydrogen()->NeedsWriteBarrierForMap()) {
Register temp = ToRegister(instr->temp());
// Update the write barrier for the map field.
__ RecordWriteForMap(object,
scratch,
temp,
GetLinkRegisterState(),
kSaveFPRegs);
}
}
// Do the store.
Register value = ToRegister(instr->value());
if (access.IsInobject()) {
MemOperand operand = FieldMemOperand(object, offset);
__ Store(value, operand, representation);
if (instr->hydrogen()->NeedsWriteBarrier()) {
// Update the write barrier for the object for in-object properties.
__ RecordWriteField(object,
offset,
value,
scratch,
GetLinkRegisterState(),
kSaveFPRegs,
EMIT_REMEMBERED_SET,
instr->hydrogen()->SmiCheckForWriteBarrier(),
instr->hydrogen()->PointersToHereCheckForValue());
}
} else {
__ ldr(scratch, FieldMemOperand(object, JSObject::kPropertiesOffset));
MemOperand operand = FieldMemOperand(scratch, offset);
__ Store(value, operand, representation);
if (instr->hydrogen()->NeedsWriteBarrier()) {
// Update the write barrier for the properties array.
// object is used as a scratch register.
__ RecordWriteField(scratch,
offset,
value,
object,
GetLinkRegisterState(),
kSaveFPRegs,
EMIT_REMEMBERED_SET,
instr->hydrogen()->SmiCheckForWriteBarrier(),
instr->hydrogen()->PointersToHereCheckForValue());
}
}
}
void LCodeGen::DoStoreNamedGeneric(LStoreNamedGeneric* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->object()).is(StoreDescriptor::ReceiverRegister()));
DCHECK(ToRegister(instr->value()).is(StoreDescriptor::ValueRegister()));
__ mov(StoreDescriptor::NameRegister(), Operand(instr->name()));
Handle<Code> ic =
StoreIC::initialize_stub(isolate(), instr->language_mode(),
instr->hydrogen()->initialization_state());
CallCode(ic, RelocInfo::CODE_TARGET, instr, NEVER_INLINE_TARGET_ADDRESS);
}
void LCodeGen::DoBoundsCheck(LBoundsCheck* instr) {
Condition cc = instr->hydrogen()->allow_equality() ? hi : hs;
if (instr->index()->IsConstantOperand()) {
Operand index = ToOperand(instr->index());
Register length = ToRegister(instr->length());
__ cmp(length, index);
cc = CommuteCondition(cc);
} else {
Register index = ToRegister(instr->index());
Operand length = ToOperand(instr->length());
__ cmp(index, length);
}
if (FLAG_debug_code && instr->hydrogen()->skip_check()) {
Label done;
__ b(NegateCondition(cc), &done);
__ stop("eliminated bounds check failed");
__ bind(&done);
} else {
DeoptimizeIf(cc, instr, Deoptimizer::kOutOfBounds);
}
}
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) : element_size_shift;
int base_offset = instr->base_offset();
if (elements_kind == EXTERNAL_FLOAT32_ELEMENTS ||
elements_kind == FLOAT32_ELEMENTS ||
elements_kind == EXTERNAL_FLOAT64_ELEMENTS ||
elements_kind == FLOAT64_ELEMENTS) {
Register address = scratch0();
DwVfpRegister value(ToDoubleRegister(instr->value()));
if (key_is_constant) {
if (constant_key != 0) {
__ add(address, external_pointer,
Operand(constant_key << element_size_shift));
} else {
address = external_pointer;
}
} else {
__ add(address, external_pointer, Operand(key, LSL, shift_size));
}
if (elements_kind == EXTERNAL_FLOAT32_ELEMENTS ||
elements_kind == FLOAT32_ELEMENTS) {
__ vcvt_f32_f64(double_scratch0().low(), value);
__ vstr(double_scratch0().low(), address, base_offset);
} else { // Storing doubles, not floats.
__ vstr(value, 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 EXTERNAL_UINT8_CLAMPED_ELEMENTS:
case EXTERNAL_INT8_ELEMENTS:
case EXTERNAL_UINT8_ELEMENTS:
case UINT8_ELEMENTS:
case UINT8_CLAMPED_ELEMENTS:
case INT8_ELEMENTS:
__ strb(value, mem_operand);
break;
case EXTERNAL_INT16_ELEMENTS:
case EXTERNAL_UINT16_ELEMENTS:
case INT16_ELEMENTS:
case UINT16_ELEMENTS:
__ strh(value, mem_operand);
break;
case EXTERNAL_INT32_ELEMENTS:
case EXTERNAL_UINT32_ELEMENTS:
case INT32_ELEMENTS:
case UINT32_ELEMENTS:
__ str(value, mem_operand);
break;
case FLOAT32_ELEMENTS:
case FLOAT64_ELEMENTS:
case EXTERNAL_FLOAT32_ELEMENTS:
case EXTERNAL_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 SLOPPY_ARGUMENTS_ELEMENTS:
UNREACHABLE();
break;
}
}
}
void LCodeGen::DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr) {
DwVfpRegister value = ToDoubleRegister(instr->value());
Register elements = ToRegister(instr->elements());
Register scratch = scratch0();
DwVfpRegister double_scratch = double_scratch0();
bool key_is_constant = instr->key()->IsConstantOperand();
int base_offset = instr->base_offset();
// 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);
}
__ add(scratch, elements,
Operand((constant_key << element_size_shift) + base_offset));
} else {
int shift_size = (instr->hydrogen()->key()->representation().IsSmi())
? (element_size_shift - kSmiTagSize) : element_size_shift;
__ add(scratch, elements, Operand(base_offset));
__ add(scratch, scratch,
Operand(ToRegister(instr->key()), LSL, shift_size));
}
if (instr->NeedsCanonicalization()) {
// Force a canonical NaN.
if (masm()->emit_debug_code()) {
__ vmrs(ip);
__ tst(ip, Operand(kVFPDefaultNaNModeControlBit));
__ Assert(ne, kDefaultNaNModeNotSet);
}
__ VFPCanonicalizeNaN(double_scratch, value);
__ vstr(double_scratch, scratch, 0);
} else {
__ vstr(value, 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()) {
__ add(scratch, elements, Operand::PointerOffsetFromSmiKey(key));
} else {
__ add(scratch, elements, Operand(key, LSL, kPointerSizeLog2));
}
}
__ str(value, MemOperand(store_base, offset));
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.
__ add(key, store_base, Operand(offset));
__ RecordWrite(elements,
key,
value,
GetLinkRegisterState(),
kSaveFPRegs,
EMIT_REMEMBERED_SET,
check_needed,
instr->hydrogen()->PointersToHereCheckForValue());
}
}
void LCodeGen::DoStoreKeyed(LStoreKeyed* instr) {
// By cases: external, fast double
if (instr->is_typed_elements()) {
DoStoreKeyedExternalArray(instr);
} else if (instr->hydrogen()->value()->representation().IsDouble()) {
DoStoreKeyedFixedDoubleArray(instr);
} else {
DoStoreKeyedFixedArray(instr);
}
}
void LCodeGen::DoStoreKeyedGeneric(LStoreKeyedGeneric* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->object()).is(StoreDescriptor::ReceiverRegister()));
DCHECK(ToRegister(instr->key()).is(StoreDescriptor::NameRegister()));
DCHECK(ToRegister(instr->value()).is(StoreDescriptor::ValueRegister()));
Handle<Code> ic = CodeFactory::KeyedStoreICInOptimizedCode(
isolate(), instr->language_mode(),
instr->hydrogen()->initialization_state()).code();
CallCode(ic, RelocInfo::CODE_TARGET, instr, NEVER_INLINE_TARGET_ADDRESS);
}
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;
__ ldr(scratch, FieldMemOperand(object_reg, HeapObject::kMapOffset));
__ cmp(scratch, Operand(from_map));
__ b(ne, &not_applicable);
if (IsSimpleMapChangeTransition(from_kind, to_kind)) {
Register new_map_reg = ToRegister(instr->new_map_temp());
__ mov(new_map_reg, Operand(to_map));
__ str(new_map_reg, FieldMemOperand(object_reg, HeapObject::kMapOffset));
// Write barrier.
__ RecordWriteForMap(object_reg,
new_map_reg,
scratch,
GetLinkRegisterState(),
kDontSaveFPRegs);
} else {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(object_reg.is(r0));
PushSafepointRegistersScope scope(this);
__ Move(r1, to_map);
bool is_js_array = from_map->instance_type() == JS_ARRAY_TYPE;
TransitionElementsKindStub stub(isolate(), from_kind, to_kind, is_js_array);
__ CallStub(&stub);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kLazyDeopt);
}
__ bind(&not_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(eq, instr, Deoptimizer::kMementoFound);
__ bind(&no_memento_found);
}
void LCodeGen::DoStringAdd(LStringAdd* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->left()).is(r1));
DCHECK(ToRegister(instr->right()).is(r0));
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, Operand::Zero());
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()));
__ mov(scratch, 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(r0);
__ SmiUntag(r0);
__ StoreToSafepointRegisterSlot(r0, 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());
DCHECK(!char_code.is(result));
__ cmp(char_code, Operand(String::kMaxOneByteCharCode));
__ b(hi, deferred->entry());
__ LoadRoot(result, Heap::kSingleCharacterStringCacheRootIndex);
__ add(result, result, Operand(char_code, LSL, kPointerSizeLog2));
__ ldr(result, FieldMemOperand(result, FixedArray::kHeaderSize));
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(result, ip);
__ b(eq, deferred->entry());
__ 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, Operand::Zero());
PushSafepointRegistersScope scope(this);
__ SmiTag(char_code);
__ push(char_code);
CallRuntimeFromDeferred(Runtime::kCharFromCode, 1, instr, instr->context());
__ StoreToSafepointRegisterSlot(r0, result);
}
void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
LOperand* input = instr->value();
DCHECK(input->IsRegister() || input->IsStackSlot());
LOperand* output = instr->result();
DCHECK(output->IsDoubleRegister());
SwVfpRegister single_scratch = double_scratch0().low();
if (input->IsStackSlot()) {
Register scratch = scratch0();
__ ldr(scratch, ToMemOperand(input));
__ vmov(single_scratch, scratch);
} else {
__ vmov(single_scratch, ToRegister(input));
}
__ vcvt_f64_s32(ToDoubleRegister(output), single_scratch);
}
void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
LOperand* input = instr->value();
LOperand* output = instr->result();
SwVfpRegister flt_scratch = double_scratch0().low();
__ vmov(flt_scratch, ToRegister(input));
__ vcvt_f64_u32(ToDoubleRegister(output), flt_scratch);
}
void LCodeGen::DoNumberTagI(LNumberTagI* instr) {
class DeferredNumberTagI FINAL : public LDeferredCode {
public:
DeferredNumberTagI(LCodeGen* codegen, LNumberTagI* instr)
: LDeferredCode(codegen), instr_(instr) { }
void Generate() OVERRIDE {
codegen()->DoDeferredNumberTagIU(instr_,
instr_->value(),
instr_->temp1(),
instr_->temp2(),
SIGNED_INT32);
}
LInstruction* instr() OVERRIDE { return instr_; }
private:
LNumberTagI* instr_;
};
Register src = ToRegister(instr->value());
Register dst = ToRegister(instr->result());
DeferredNumberTagI* deferred = new(zone()) DeferredNumberTagI(this, instr);
__ SmiTag(dst, src, SetCC);
__ b(vs, deferred->entry());
__ bind(deferred->exit());
}
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);
__ cmp(input, Operand(Smi::kMaxValue));
__ b(hi, deferred->entry());
__ 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);
LowDwVfpRegister 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);
__ eor(src, src, Operand(0x80000000));
}
__ vmov(dbl_scratch.low(), src);
__ vcvt_f64_s32(dbl_scratch, dbl_scratch.low());
} else {
__ vmov(dbl_scratch.low(), src);
__ vcvt_f64_u32(dbl_scratch, dbl_scratch.low());
}
if (FLAG_inline_new) {
__ LoadRoot(tmp3, Heap::kHeapNumberMapRootIndex);
__ AllocateHeapNumber(dst, tmp1, tmp2, tmp3, &slow, DONT_TAG_RESULT);
__ b(&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, Operand::Zero());
// Preserve the value of all registers.
PushSafepointRegistersScope scope(this);
// NumberTagI and NumberTagD use the context from the frame, rather than
// the environment's HContext or HInlinedContext value.
// They only call Runtime::kAllocateHeapNumber.
// The corresponding HChange instructions are added in a phase that does
// not have easy access to the local context.
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
__ sub(r0, r0, Operand(kHeapObjectTag));
__ StoreToSafepointRegisterSlot(r0, dst);
}
// Done. Put the value in dbl_scratch into the value of the allocated heap
// number.
__ bind(&done);
__ vstr(dbl_scratch, dst, HeapNumber::kValueOffset);
__ add(dst, dst, Operand(kHeapObjectTag));
}
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_;
};
DwVfpRegister 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(),
DONT_TAG_RESULT);
} else {
__ jmp(deferred->entry());
}
__ bind(deferred->exit());
__ vstr(input_reg, reg, HeapNumber::kValueOffset);
// Now that we have finished with the object's real address tag it
__ add(reg, reg, Operand(kHeapObjectTag));
}
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, Operand::Zero());
PushSafepointRegistersScope scope(this);
// NumberTagI and NumberTagD use the context from the frame, rather than
// the environment's HContext or HInlinedContext value.
// They only call Runtime::kAllocateHeapNumber.
// The corresponding HChange instructions are added in a phase that does
// not have easy access to the local context.
__ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
__ CallRuntimeSaveDoubles(Runtime::kAllocateHeapNumber);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kNoLazyDeopt);
__ sub(r0, r0, Operand(kHeapObjectTag));
__ StoreToSafepointRegisterSlot(r0, 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)) {
__ tst(input, Operand(0xc0000000));
DeoptimizeIf(ne, instr, Deoptimizer::kOverflow);
}
if (hchange->CheckFlag(HValue::kCanOverflow) &&
!hchange->value()->CheckFlag(HValue::kUint32)) {
__ SmiTag(output, input, SetCC);
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
} else {
__ SmiTag(output, input);
}
}
void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
Register input = ToRegister(instr->value());
Register result = ToRegister(instr->result());
if (instr->needs_check()) {
STATIC_ASSERT(kHeapObjectTag == 1);
// If the input is a HeapObject, SmiUntag will set the carry flag.
__ SmiUntag(result, input, SetCC);
DeoptimizeIf(cs, instr, Deoptimizer::kNotASmi);
} else {
__ SmiUntag(result, input);
}
}
void LCodeGen::EmitNumberUntagD(LNumberUntagD* instr, Register input_reg,
DwVfpRegister result_reg,
NumberUntagDMode mode) {
bool can_convert_undefined_to_nan =
instr->hydrogen()->can_convert_undefined_to_nan();
bool deoptimize_on_minus_zero = instr->hydrogen()->deoptimize_on_minus_zero();
Register scratch = scratch0();
SwVfpRegister flt_scratch = double_scratch0().low();
DCHECK(!result_reg.is(double_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.
__ ldr(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kHeapNumberMapRootIndex);
__ cmp(scratch, Operand(ip));
if (can_convert_undefined_to_nan) {
__ b(ne, &convert);
} else {
DeoptimizeIf(ne, instr, Deoptimizer::kNotAHeapNumber);
}
// load heap number
__ vldr(result_reg, input_reg, HeapNumber::kValueOffset - kHeapObjectTag);
if (deoptimize_on_minus_zero) {
__ VmovLow(scratch, result_reg);
__ cmp(scratch, Operand::Zero());
__ b(ne, &done);
__ VmovHigh(scratch, result_reg);
__ cmp(scratch, Operand(HeapNumber::kSignMask));
DeoptimizeIf(eq, instr, Deoptimizer::kMinusZero);
}
__ jmp(&done);
if (can_convert_undefined_to_nan) {
__ bind(&convert);
// Convert undefined (and hole) to NaN.
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(input_reg, Operand(ip));
DeoptimizeIf(ne, instr, Deoptimizer::kNotAHeapNumberUndefined);
__ LoadRoot(scratch, Heap::kNanValueRootIndex);
__ vldr(result_reg, scratch, HeapNumber::kValueOffset - kHeapObjectTag);
__ jmp(&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
__ vmov(flt_scratch, scratch);
__ vcvt_f64_s32(result_reg, flt_scratch);
__ bind(&done);
}
void LCodeGen::DoDeferredTaggedToI(LTaggedToI* instr) {
Register input_reg = ToRegister(instr->value());
Register scratch1 = scratch0();
Register scratch2 = ToRegister(instr->temp());
LowDwVfpRegister double_scratch = double_scratch0();
DwVfpRegister 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 was optimistically untagged; revert it.
// The carry flag is set when we reach this deferred code as we just executed
// SmiUntag(heap_object, SetCC)
STATIC_ASSERT(kHeapObjectTag == 1);
__ adc(scratch2, input_reg, Operand(input_reg));
// Heap number map check.
__ ldr(scratch1, FieldMemOperand(scratch2, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kHeapNumberMapRootIndex);
__ cmp(scratch1, Operand(ip));
if (instr->truncating()) {
// Performs a truncating conversion of a floating point number as used by
// the JS bitwise operations.
Label no_heap_number, check_bools, check_false;
__ b(ne, &no_heap_number);
__ TruncateHeapNumberToI(input_reg, scratch2);
__ b(&done);
// Check for Oddballs. Undefined/False is converted to zero and True to one
// for truncating conversions.
__ bind(&no_heap_number);
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(scratch2, Operand(ip));
__ b(ne, &check_bools);
__ mov(input_reg, Operand::Zero());
__ b(&done);
__ bind(&check_bools);
__ LoadRoot(ip, Heap::kTrueValueRootIndex);
__ cmp(scratch2, Operand(ip));
__ b(ne, &check_false);
__ mov(input_reg, Operand(1));
__ b(&done);
__ bind(&check_false);
__ LoadRoot(ip, Heap::kFalseValueRootIndex);
__ cmp(scratch2, Operand(ip));
DeoptimizeIf(ne, instr, Deoptimizer::kNotAHeapNumberUndefinedBoolean);
__ mov(input_reg, Operand::Zero());
} else {
DeoptimizeIf(ne, instr, Deoptimizer::kNotAHeapNumber);
__ sub(ip, scratch2, Operand(kHeapObjectTag));
__ vldr(double_scratch2, ip, HeapNumber::kValueOffset);
__ TryDoubleToInt32Exact(input_reg, double_scratch2, double_scratch);
DeoptimizeIf(ne, instr, Deoptimizer::kLostPrecisionOrNaN);
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
__ cmp(input_reg, Operand::Zero());
__ b(ne, &done);
__ VmovHigh(scratch1, double_scratch2);
__ tst(scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, Deoptimizer::kMinusZero);
}
}
__ 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);
// Optimistically untag the input.
// If the input is a HeapObject, SmiUntag will set the carry flag.
__ SmiUntag(input_reg, SetCC);
// Branch to deferred code if the input was tagged.
// The deferred code will take care of restoring the tag.
__ b(cs, deferred->entry());
__ 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);
DwVfpRegister 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();
DwVfpRegister double_input = ToDoubleRegister(instr->value());
LowDwVfpRegister double_scratch = double_scratch0();
if (instr->truncating()) {
__ TruncateDoubleToI(result_reg, double_input);
} else {
__ TryDoubleToInt32Exact(result_reg, double_input, double_scratch);
// Deoptimize if the input wasn't a int32 (inside a double).
DeoptimizeIf(ne, instr, Deoptimizer::kLostPrecisionOrNaN);
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label done;
__ cmp(result_reg, Operand::Zero());
__ b(ne, &done);
__ VmovHigh(scratch1, double_input);
__ tst(scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, Deoptimizer::kMinusZero);
__ bind(&done);
}
}
}
void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
Register result_reg = ToRegister(instr->result());
Register scratch1 = scratch0();
DwVfpRegister double_input = ToDoubleRegister(instr->value());
LowDwVfpRegister double_scratch = double_scratch0();
if (instr->truncating()) {
__ TruncateDoubleToI(result_reg, double_input);
} else {
__ TryDoubleToInt32Exact(result_reg, double_input, double_scratch);
// Deoptimize if the input wasn't a int32 (inside a double).
DeoptimizeIf(ne, instr, Deoptimizer::kLostPrecisionOrNaN);
if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
Label done;
__ cmp(result_reg, Operand::Zero());
__ b(ne, &done);
__ VmovHigh(scratch1, double_input);
__ tst(scratch1, Operand(HeapNumber::kSignMask));
DeoptimizeIf(ne, instr, Deoptimizer::kMinusZero);
__ bind(&done);
}
}
__ SmiTag(result_reg, SetCC);
DeoptimizeIf(vs, instr, Deoptimizer::kOverflow);
}
void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
LOperand* input = instr->value();
__ SmiTst(ToRegister(input));
DeoptimizeIf(ne, instr, Deoptimizer::kNotASmi);
}
void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
if (!instr->hydrogen()->value()->type().IsHeapObject()) {
LOperand* input = instr->value();
__ SmiTst(ToRegister(input));
DeoptimizeIf(eq, instr, Deoptimizer::kSmi);
}
}
void LCodeGen::DoCheckInstanceType(LCheckInstanceType* instr) {
Register input = ToRegister(instr->value());
Register scratch = scratch0();
__ ldr(scratch, FieldMemOperand(input, HeapObject::kMapOffset));
__ ldrb(scratch, FieldMemOperand(scratch, Map::kInstanceTypeOffset));
if (instr->hydrogen()->is_interval_check()) {
InstanceType first;
InstanceType last;
instr->hydrogen()->GetCheckInterval(&first, &last);
__ cmp(scratch, Operand(first));
// If there is only one type in the interval check for equality.
if (first == last) {
DeoptimizeIf(ne, instr, Deoptimizer::kWrongInstanceType);
} else {
DeoptimizeIf(lo, instr, Deoptimizer::kWrongInstanceType);
// Omit check for the last type.
if (last != LAST_TYPE) {
__ cmp(scratch, Operand(last));
DeoptimizeIf(hi, instr, Deoptimizer::kWrongInstanceType);
}
}
} else {
uint8_t mask;
uint8_t tag;
instr->hydrogen()->GetCheckMaskAndTag(&mask, &tag);
if (base::bits::IsPowerOfTwo32(mask)) {
DCHECK(tag == 0 || base::bits::IsPowerOfTwo32(tag));
__ tst(scratch, Operand(mask));
DeoptimizeIf(tag == 0 ? ne : eq, instr, Deoptimizer::kWrongInstanceType);
} else {
__ and_(scratch, scratch, Operand(mask));
__ cmp(scratch, Operand(tag));
DeoptimizeIf(ne, instr, Deoptimizer::kWrongInstanceType);
}
}
}
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);
__ mov(ip, Operand(cell));
__ ldr(ip, FieldMemOperand(ip, Cell::kValueOffset));
__ cmp(reg, ip);
} else {
__ cmp(reg, Operand(object));
}
DeoptimizeIf(ne, instr, Deoptimizer::kValueMismatch);
}
void LCodeGen::DoDeferredInstanceMigration(LCheckMaps* instr, Register object) {
{
PushSafepointRegistersScope scope(this);
__ push(object);
__ mov(cp, Operand::Zero());
__ CallRuntimeSaveDoubles(Runtime::kTryMigrateInstance);
RecordSafepointWithRegisters(
instr->pointer_map(), 1, Safepoint::kNoLazyDeopt);
__ StoreToSafepointRegisterSlot(r0, scratch0());
}
__ tst(scratch0(), Operand(kSmiTagMask));
DeoptimizeIf(eq, instr, Deoptimizer::kInstanceMigrationFailed);
}
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);
__ ldr(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();
__ CompareMap(map_reg, map, &success);
__ b(eq, &success);
}
Handle<Map> map = maps->at(maps->size() - 1).handle();
__ CompareMap(map_reg, map, &success);
if (instr->hydrogen()->HasMigrationTarget()) {
__ b(ne, deferred->entry());
} else {
DeoptimizeIf(ne, instr, Deoptimizer::kWrongMap);
}
__ bind(&success);
}
void LCodeGen::DoClampDToUint8(LClampDToUint8* instr) {
DwVfpRegister value_reg = ToDoubleRegister(instr->unclamped());
Register result_reg = ToRegister(instr->result());
__ ClampDoubleToUint8(result_reg, value_reg, double_scratch0());
}
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());
DwVfpRegister temp_reg = ToDoubleRegister(instr->temp());
Label is_smi, done, heap_number;
// Both smi and heap number cases are handled.
__ UntagAndJumpIfSmi(result_reg, input_reg, &is_smi);
// Check for heap number
__ ldr(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
__ cmp(scratch, Operand(factory()->heap_number_map()));
__ b(eq, &heap_number);
// Check for undefined. Undefined is converted to zero for clamping
// conversions.
__ cmp(input_reg, Operand(factory()->undefined_value()));
DeoptimizeIf(ne, instr, Deoptimizer::kNotAHeapNumberUndefined);
__ mov(result_reg, Operand::Zero());
__ jmp(&done);
// Heap number
__ bind(&heap_number);
__ vldr(temp_reg, FieldMemOperand(input_reg, HeapNumber::kValueOffset));
__ ClampDoubleToUint8(result_reg, temp_reg, double_scratch0());
__ jmp(&done);
// smi
__ bind(&is_smi);
__ ClampUint8(result_reg, result_reg);
__ bind(&done);
}
void LCodeGen::DoDoubleBits(LDoubleBits* instr) {
DwVfpRegister value_reg = ToDoubleRegister(instr->value());
Register result_reg = ToRegister(instr->result());
if (instr->hydrogen()->bits() == HDoubleBits::HIGH) {
__ VmovHigh(result_reg, value_reg);
} else {
__ VmovLow(result_reg, value_reg);
}
}
void LCodeGen::DoConstructDouble(LConstructDouble* instr) {
Register hi_reg = ToRegister(instr->hi());
Register lo_reg = ToRegister(instr->lo());
DwVfpRegister result_reg = ToDoubleRegister(instr->result());
__ VmovHigh(result_reg, hi_reg);
__ VmovLow(result_reg, lo_reg);
}
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 = TAG_OBJECT;
if (instr->hydrogen()->MustAllocateDoubleAligned()) {
flags = static_cast<AllocationFlags>(flags | DOUBLE_ALIGNMENT);
}
if (instr->hydrogen()->IsOldPointerSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsOldDataSpaceAllocation());
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
flags = static_cast<AllocationFlags>(flags | PRETENURE_OLD_POINTER_SPACE);
} else if (instr->hydrogen()->IsOldDataSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
flags = static_cast<AllocationFlags>(flags | PRETENURE_OLD_DATA_SPACE);
}
if (instr->size()->IsConstantOperand()) {
int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
if (size <= Page::kMaxRegularHeapObjectSize) {
__ Allocate(size, result, scratch, scratch2, deferred->entry(), flags);
} else {
__ jmp(deferred->entry());
}
} 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()));
__ mov(scratch, Operand(size - kHeapObjectTag));
} else {
__ sub(scratch, ToRegister(instr->size()), Operand(kHeapObjectTag));
}
__ mov(scratch2, Operand(isolate()->factory()->one_pointer_filler_map()));
Label loop;
__ bind(&loop);
__ sub(scratch, scratch, Operand(kPointerSize), SetCC);
__ str(scratch2, MemOperand(result, scratch));
__ b(ge, &loop);
}
}
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, Operand(Smi::FromInt(0)));
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) {
__ Push(Smi::FromInt(size));
} else {
// We should never get here at runtime => abort
__ stop("invalid allocation size");
return;
}
}
int flags = AllocateDoubleAlignFlag::encode(
instr->hydrogen()->MustAllocateDoubleAligned());
if (instr->hydrogen()->IsOldPointerSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsOldDataSpaceAllocation());
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
flags = AllocateTargetSpace::update(flags, OLD_POINTER_SPACE);
} else if (instr->hydrogen()->IsOldDataSpaceAllocation()) {
DCHECK(!instr->hydrogen()->IsNewSpaceAllocation());
flags = AllocateTargetSpace::update(flags, OLD_DATA_SPACE);
} else {
flags = AllocateTargetSpace::update(flags, NEW_SPACE);
}
__ Push(Smi::FromInt(flags));
CallRuntimeFromDeferred(
Runtime::kAllocateInTargetSpace, 2, instr, instr->context());
__ StoreToSafepointRegisterSlot(r0, result);
}
void LCodeGen::DoToFastProperties(LToFastProperties* instr) {
DCHECK(ToRegister(instr->value()).is(r0));
__ push(r0);
CallRuntime(Runtime::kToFastProperties, 1, instr);
}
void LCodeGen::DoRegExpLiteral(LRegExpLiteral* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
Label materialized;
// Registers will be used as follows:
// r6 = literals array.
// r1 = regexp literal.
// r0 = regexp literal clone.
// r2-5 are used as temporaries.
int literal_offset =
FixedArray::OffsetOfElementAt(instr->hydrogen()->literal_index());
__ Move(r6, instr->hydrogen()->literals());
__ ldr(r1, FieldMemOperand(r6, literal_offset));
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(r1, ip);
__ b(ne, &materialized);
// Create regexp literal using runtime function
// Result will be in r0.
__ mov(r5, Operand(Smi::FromInt(instr->hydrogen()->literal_index())));
__ mov(r4, Operand(instr->hydrogen()->pattern()));
__ mov(r3, Operand(instr->hydrogen()->flags()));
__ Push(r6, r5, r4, r3);
CallRuntime(Runtime::kMaterializeRegExpLiteral, 4, instr);
__ mov(r1, r0);
__ bind(&materialized);
int size = JSRegExp::kSize + JSRegExp::kInObjectFieldCount * kPointerSize;
Label allocated, runtime_allocate;
__ Allocate(size, r0, r2, r3, &runtime_allocate, TAG_OBJECT);
__ jmp(&allocated);
__ bind(&runtime_allocate);
__ mov(r0, Operand(Smi::FromInt(size)));
__ Push(r1, r0);
CallRuntime(Runtime::kAllocateInNewSpace, 1, instr);
__ pop(r1);
__ bind(&allocated);
// Copy the content into the newly allocated memory.
__ CopyFields(r0, r1, double_scratch0(), size / kPointerSize);
}
void LCodeGen::DoFunctionLiteral(LFunctionLiteral* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
// Use the fast case closure allocation code that allocates in new
// space for nested functions that don't need literals cloning.
bool pretenure = instr->hydrogen()->pretenure();
if (!pretenure && instr->hydrogen()->has_no_literals()) {
FastNewClosureStub stub(isolate(), instr->hydrogen()->language_mode(),
instr->hydrogen()->kind());
__ mov(r2, Operand(instr->hydrogen()->shared_info()));
CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
} else {
__ mov(r2, Operand(instr->hydrogen()->shared_info()));
__ mov(r1, Operand(pretenure ? factory()->true_value()
: factory()->false_value()));
__ Push(cp, r2, r1);
CallRuntime(Runtime::kNewClosure, 3, instr);
}
}
void LCodeGen::DoTypeof(LTypeof* instr) {
Register input = ToRegister(instr->value());
__ push(input);
CallRuntime(Runtime::kTypeof, 1, instr);
}
void LCodeGen::DoTypeofIsAndBranch(LTypeofIsAndBranch* instr) {
Register input = ToRegister(instr->value());
Condition final_branch_condition = EmitTypeofIs(instr->TrueLabel(chunk_),
instr->FalseLabel(chunk_),
input,
instr->type_literal());
if (final_branch_condition != kNoCondition) {
EmitBranch(instr, final_branch_condition);
}
}
Condition LCodeGen::EmitTypeofIs(Label* true_label,
Label* false_label,
Register input,
Handle<String> type_name) {
Condition final_branch_condition = kNoCondition;
Register scratch = scratch0();
Factory* factory = isolate()->factory();
if (String::Equals(type_name, factory->number_string())) {
__ JumpIfSmi(input, true_label);
__ ldr(scratch, FieldMemOperand(input, HeapObject::kMapOffset));
__ CompareRoot(scratch, Heap::kHeapNumberMapRootIndex);
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->string_string())) {
__ JumpIfSmi(input, false_label);
__ CompareObjectType(input, scratch, no_reg, FIRST_NONSTRING_TYPE);
__ b(ge, false_label);
__ ldrb(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
__ tst(scratch, Operand(1 << Map::kIsUndetectable));
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->symbol_string())) {
__ JumpIfSmi(input, false_label);
__ CompareObjectType(input, scratch, no_reg, SYMBOL_TYPE);
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->boolean_string())) {
__ CompareRoot(input, Heap::kTrueValueRootIndex);
__ b(eq, true_label);
__ CompareRoot(input, Heap::kFalseValueRootIndex);
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->undefined_string())) {
__ CompareRoot(input, Heap::kUndefinedValueRootIndex);
__ b(eq, true_label);
__ JumpIfSmi(input, false_label);
// Check for undetectable objects => true.
__ ldr(scratch, FieldMemOperand(input, HeapObject::kMapOffset));
__ ldrb(scratch, FieldMemOperand(scratch, Map::kBitFieldOffset));
__ tst(scratch, Operand(1 << Map::kIsUndetectable));
final_branch_condition = ne;
} else if (String::Equals(type_name, factory->function_string())) {
STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
Register type_reg = scratch;
__ JumpIfSmi(input, false_label);
__ CompareObjectType(input, scratch, type_reg, JS_FUNCTION_TYPE);
__ b(eq, true_label);
__ cmp(type_reg, Operand(JS_FUNCTION_PROXY_TYPE));
final_branch_condition = eq;
} else if (String::Equals(type_name, factory->object_string())) {
Register map = scratch;
__ JumpIfSmi(input, false_label);
__ CompareRoot(input, Heap::kNullValueRootIndex);
__ b(eq, true_label);
__ CheckObjectTypeRange(input,
map,
FIRST_NONCALLABLE_SPEC_OBJECT_TYPE,
LAST_NONCALLABLE_SPEC_OBJECT_TYPE,
false_label);
// Check for undetectable objects => false.
__ ldrb(scratch, FieldMemOperand(map, Map::kBitFieldOffset));
__ tst(scratch, Operand(1 << Map::kIsUndetectable));
final_branch_condition = eq;
} else {
__ b(false_label);
}
return final_branch_condition;
}
void LCodeGen::DoIsConstructCallAndBranch(LIsConstructCallAndBranch* instr) {
Register temp1 = ToRegister(instr->temp());
EmitIsConstructCall(temp1, scratch0());
EmitBranch(instr, eq);
}
void LCodeGen::EmitIsConstructCall(Register temp1, Register temp2) {
DCHECK(!temp1.is(temp2));
// Get the frame pointer for the calling frame.
__ ldr(temp1, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
// Skip the arguments adaptor frame if it exists.
__ ldr(temp2, MemOperand(temp1, StandardFrameConstants::kContextOffset));
__ cmp(temp2, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR)));
__ ldr(temp1, MemOperand(temp1, StandardFrameConstants::kCallerFPOffset), eq);
// Check the marker in the calling frame.
__ ldr(temp1, MemOperand(temp1, StandardFrameConstants::kMarkerOffset));
__ cmp(temp1, Operand(Smi::FromInt(StackFrame::CONSTRUCT)));
}
void LCodeGen::EnsureSpaceForLazyDeopt(int space_needed) {
if (!info()->IsStub()) {
// 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) {
// Block literal pool emission for duration of padding.
Assembler::BlockConstPoolScope block_const_pool(masm());
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);
}
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(ip, Heap::kStackLimitRootIndex);
__ cmp(sp, Operand(ip));
__ b(hs, &done);
Handle<Code> stack_check = isolate()->builtins()->StackCheck();
PredictableCodeSizeScope predictable(masm(),
CallCodeSize(stack_check, RelocInfo::CODE_TARGET));
DCHECK(instr->context()->IsRegister());
DCHECK(ToRegister(instr->context()).is(cp));
CallCode(stack_check, 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(ip, Heap::kStackLimitRootIndex);
__ cmp(sp, Operand(ip));
__ b(lo, deferred_stack_check->entry());
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) {
__ LoadRoot(ip, Heap::kUndefinedValueRootIndex);
__ cmp(r0, ip);
DeoptimizeIf(eq, instr, Deoptimizer::kUndefined);
Register null_value = r5;
__ LoadRoot(null_value, Heap::kNullValueRootIndex);
__ cmp(r0, null_value);
DeoptimizeIf(eq, instr, Deoptimizer::kNull);
__ SmiTst(r0);
DeoptimizeIf(eq, instr, Deoptimizer::kSmi);
STATIC_ASSERT(FIRST_JS_PROXY_TYPE == FIRST_SPEC_OBJECT_TYPE);
__ CompareObjectType(r0, r1, r1, LAST_JS_PROXY_TYPE);
DeoptimizeIf(le, instr, Deoptimizer::kWrongInstanceType);
Label use_cache, call_runtime;
__ CheckEnumCache(null_value, &call_runtime);
__ ldr(r0, FieldMemOperand(r0, HeapObject::kMapOffset));
__ b(&use_cache);
// Get the set of properties to enumerate.
__ bind(&call_runtime);
__ push(r0);
CallRuntime(Runtime::kGetPropertyNamesFast, 1, instr);
__ ldr(r1, FieldMemOperand(r0, HeapObject::kMapOffset));
__ LoadRoot(ip, Heap::kMetaMapRootIndex);
__ cmp(r1, ip);
DeoptimizeIf(ne, instr, Deoptimizer::kWrongMap);
__ 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);
__ cmp(result, Operand(Smi::FromInt(0)));
__ b(ne, &load_cache);
__ mov(result, Operand(isolate()->factory()->empty_fixed_array()));
__ jmp(&done);
__ bind(&load_cache);
__ LoadInstanceDescriptors(map, result);
__ ldr(result,
FieldMemOperand(result, DescriptorArray::kEnumCacheOffset));
__ ldr(result,
FieldMemOperand(result, FixedArray::SizeFor(instr->idx())));
__ cmp(result, Operand::Zero());
DeoptimizeIf(eq, instr, Deoptimizer::kNoCache);
__ bind(&done);
}
void LCodeGen::DoCheckMapValue(LCheckMapValue* instr) {
Register object = ToRegister(instr->value());
Register map = ToRegister(instr->map());
__ ldr(scratch0(), FieldMemOperand(object, HeapObject::kMapOffset));
__ cmp(map, scratch0());
DeoptimizeIf(ne, instr, Deoptimizer::kWrongMap);
}
void LCodeGen::DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
Register result,
Register object,
Register index) {
PushSafepointRegistersScope scope(this);
__ Push(object);
__ Push(index);
__ mov(cp, Operand::Zero());
__ CallRuntimeSaveDoubles(Runtime::kLoadMutableDouble);
RecordSafepointWithRegisters(
instr->pointer_map(), 2, Safepoint::kNoLazyDeopt);
__ StoreToSafepointRegisterSlot(r0, 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;
__ tst(index, Operand(Smi::FromInt(1)));
__ b(ne, deferred->entry());
__ mov(index, Operand(index, ASR, 1));
__ cmp(index, Operand::Zero());
__ b(lt, &out_of_object);
__ add(scratch, object, Operand::PointerOffsetFromSmiKey(index));
__ ldr(result, FieldMemOperand(scratch, JSObject::kHeaderSize));
__ b(&done);
__ bind(&out_of_object);
__ ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
// Index is equal to negated out of object property index plus 1.
STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize < kPointerSizeLog2);
__ sub(scratch, result, Operand::PointerOffsetFromSmiKey(index));
__ ldr(result, FieldMemOperand(scratch,
FixedArray::kHeaderSize - kPointerSize));
__ bind(deferred->exit());
__ bind(&done);
}
void LCodeGen::DoStoreFrameContext(LStoreFrameContext* instr) {
Register context = ToRegister(instr->context());
__ str(context, MemOperand(fp, StandardFrameConstants::kContextOffset));
}
void LCodeGen::DoAllocateBlockContext(LAllocateBlockContext* instr) {
Handle<ScopeInfo> scope_info = instr->scope_info();
__ Push(scope_info);
__ push(ToRegister(instr->function()));
CallRuntime(Runtime::kPushBlockContext, 2, instr);
RecordSafepoint(Safepoint::kNoLazyDeopt);
}
#undef __
} } // namespace v8::internal
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