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lithium-codegen-arm64.cc
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// Copyright 2013 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/arm64/lithium-codegen-arm64.h"
#include "src/arm64/lithium-gap-resolver-arm64.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() { }
virtual void BeforeCall(int call_size) const { }
virtual void AfterCall() const {
codegen_->RecordSafepoint(pointers_, deopt_mode_);
}
private:
LCodeGen* codegen_;
LPointerMap* pointers_;
Safepoint::DeoptMode deopt_mode_;
};
#define __ masm()->
// Emit code to branch if the given condition holds.
// The code generated here doesn't modify the flags and they must have
// been set by some prior instructions.
//
// The EmitInverted function simply inverts the condition.
class BranchOnCondition : public BranchGenerator {
public:
BranchOnCondition(LCodeGen* codegen, Condition cond)
: BranchGenerator(codegen),
cond_(cond) { }
virtual void Emit(Label* label) const {
__ B(cond_, label);
}
virtual void EmitInverted(Label* label) const {
if (cond_ != al) {
__ B(NegateCondition(cond_), label);
}
}
private:
Condition cond_;
};
// Emit code to compare lhs and rhs and branch if the condition holds.
// This uses MacroAssembler's CompareAndBranch function so it will handle
// converting the comparison to Cbz/Cbnz if the right-hand side is 0.
//
// EmitInverted still compares the two operands but inverts the condition.
class CompareAndBranch : public BranchGenerator {
public:
CompareAndBranch(LCodeGen* codegen,
Condition cond,
const Register& lhs,
const Operand& rhs)
: BranchGenerator(codegen),
cond_(cond),
lhs_(lhs),
rhs_(rhs) { }
virtual void Emit(Label* label) const {
__ CompareAndBranch(lhs_, rhs_, cond_, label);
}
virtual void EmitInverted(Label* label) const {
__ CompareAndBranch(lhs_, rhs_, NegateCondition(cond_), label);
}
private:
Condition cond_;
const Register& lhs_;
const Operand& rhs_;
};
// Test the input with the given mask and branch if the condition holds.
// If the condition is 'eq' or 'ne' this will use MacroAssembler's
// TestAndBranchIfAllClear and TestAndBranchIfAnySet so it will handle the
// conversion to Tbz/Tbnz when possible.
class TestAndBranch : public BranchGenerator {
public:
TestAndBranch(LCodeGen* codegen,
Condition cond,
const Register& value,
uint64_t mask)
: BranchGenerator(codegen),
cond_(cond),
value_(value),
mask_(mask) { }
virtual void Emit(Label* label) const {
switch (cond_) {
case eq:
__ TestAndBranchIfAllClear(value_, mask_, label);
break;
case ne:
__ TestAndBranchIfAnySet(value_, mask_, label);
break;
default:
__ Tst(value_, mask_);
__ B(cond_, label);
}
}
virtual void EmitInverted(Label* label) const {
// The inverse of "all clear" is "any set" and vice versa.
switch (cond_) {
case eq:
__ TestAndBranchIfAnySet(value_, mask_, label);
break;
case ne:
__ TestAndBranchIfAllClear(value_, mask_, label);
break;
default:
__ Tst(value_, mask_);
__ B(NegateCondition(cond_), label);
}
}
private:
Condition cond_;
const Register& value_;
uint64_t mask_;
};
// Test the input and branch if it is non-zero and not a NaN.
class BranchIfNonZeroNumber : public BranchGenerator {
public:
BranchIfNonZeroNumber(LCodeGen* codegen, const FPRegister& value,
const FPRegister& scratch)
: BranchGenerator(codegen), value_(value), scratch_(scratch) { }
virtual void Emit(Label* label) const {
__ Fabs(scratch_, value_);
// Compare with 0.0. Because scratch_ is positive, the result can be one of
// nZCv (equal), nzCv (greater) or nzCV (unordered).
__ Fcmp(scratch_, 0.0);
__ B(gt, label);
}
virtual void EmitInverted(Label* label) const {
__ Fabs(scratch_, value_);
__ Fcmp(scratch_, 0.0);
__ B(le, label);
}
private:
const FPRegister& value_;
const FPRegister& scratch_;
};
// Test the input and branch if it is a heap number.
class BranchIfHeapNumber : public BranchGenerator {
public:
BranchIfHeapNumber(LCodeGen* codegen, const Register& value)
: BranchGenerator(codegen), value_(value) { }
virtual void Emit(Label* label) const {
__ JumpIfHeapNumber(value_, label);
}
virtual void EmitInverted(Label* label) const {
__ JumpIfNotHeapNumber(value_, label);
}
private:
const Register& value_;
};
// Test the input and branch if it is the specified root value.
class BranchIfRoot : public BranchGenerator {
public:
BranchIfRoot(LCodeGen* codegen, const Register& value,
Heap::RootListIndex index)
: BranchGenerator(codegen), value_(value), index_(index) { }
virtual void Emit(Label* label) const {
__ JumpIfRoot(value_, index_, label);
}
virtual void EmitInverted(Label* label) const {
__ JumpIfNotRoot(value_, index_, label);
}
private:
const Register& value_;
const Heap::RootListIndex index_;
};
void LCodeGen::WriteTranslation(LEnvironment* environment,
Translation* translation) {
if (environment == NULL) return;
// The translation includes one command per value in the environment.
int translation_size = environment->translation_size();
WriteTranslation(environment->outer(), translation);
WriteTranslationFrame(environment, translation);
int object_index = 0;
int dematerialized_index = 0;
for (int i = 0; i < translation_size; ++i) {
LOperand* value = environment->values()->at(i);
AddToTranslation(
environment, translation, value, environment->HasTaggedValueAt(i),
environment->HasUint32ValueAt(i), &object_index, &dematerialized_index);
}
}
void LCodeGen::AddToTranslation(LEnvironment* environment,
Translation* translation,
LOperand* op,
bool is_tagged,
bool is_uint32,
int* object_index_pointer,
int* dematerialized_index_pointer) {
if (op == LEnvironment::materialization_marker()) {
int object_index = (*object_index_pointer)++;
if (environment->ObjectIsDuplicateAt(object_index)) {
int dupe_of = environment->ObjectDuplicateOfAt(object_index);
translation->DuplicateObject(dupe_of);
return;
}
int object_length = environment->ObjectLengthAt(object_index);
if (environment->ObjectIsArgumentsAt(object_index)) {
translation->BeginArgumentsObject(object_length);
} else {
translation->BeginCapturedObject(object_length);
}
int dematerialized_index = *dematerialized_index_pointer;
int env_offset = environment->translation_size() + dematerialized_index;
*dematerialized_index_pointer += object_length;
for (int i = 0; i < object_length; ++i) {
LOperand* value = environment->values()->at(env_offset + i);
AddToTranslation(environment,
translation,
value,
environment->HasTaggedValueAt(env_offset + i),
environment->HasUint32ValueAt(env_offset + i),
object_index_pointer,
dematerialized_index_pointer);
}
return;
}
if (op->IsStackSlot()) {
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();
}
}
void LCodeGen::RegisterEnvironmentForDeoptimization(LEnvironment* environment,
Safepoint::DeoptMode mode) {
environment->set_has_been_used();
if (!environment->HasBeenRegistered()) {
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::CallCode(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr) {
CallCodeGeneric(code, mode, instr, RECORD_SIMPLE_SAFEPOINT);
}
void LCodeGen::CallCodeGeneric(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr,
SafepointMode safepoint_mode) {
DCHECK(instr != NULL);
Assembler::BlockPoolsScope scope(masm_);
__ Call(code, mode);
RecordSafepointWithLazyDeopt(instr, safepoint_mode);
if ((code->kind() == Code::BINARY_OP_IC) ||
(code->kind() == Code::COMPARE_IC)) {
// Signal that we don't inline smi code before these stubs in the
// optimizing code generator.
InlineSmiCheckInfo::EmitNotInlined(masm());
}
}
void LCodeGen::DoCallFunction(LCallFunction* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->function()).Is(x1));
DCHECK(ToRegister(instr->result()).Is(x0));
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(x3));
DCHECK(vector_register.is(x2));
AllowDeferredHandleDereference vector_structure_check;
Handle<TypeFeedbackVector> vector = instr->hydrogen()->feedback_vector();
int index = vector->GetIndex(instr->hydrogen()->slot());
__ Mov(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);
}
RecordPushedArgumentsDelta(instr->hydrogen()->argument_delta());
}
void LCodeGen::DoCallNew(LCallNew* instr) {
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(instr->IsMarkedAsCall());
DCHECK(ToRegister(instr->constructor()).is(x1));
__ Mov(x0, instr->arity());
// No cell in x2 for construct type feedback in optimized code.
__ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
CallConstructStub stub(isolate(), NO_CALL_CONSTRUCTOR_FLAGS);
CallCode(stub.GetCode(), RelocInfo::CONSTRUCT_CALL, instr);
RecordPushedArgumentsDelta(instr->hydrogen()->argument_delta());
DCHECK(ToRegister(instr->result()).is(x0));
}
void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
DCHECK(instr->IsMarkedAsCall());
DCHECK(ToRegister(instr->context()).is(cp));
DCHECK(ToRegister(instr->constructor()).is(x1));
__ Mov(x0, Operand(instr->arity()));
if (instr->arity() == 1) {
// We only need the allocation site for the case we have a length argument.
// The case may bail out to the runtime, which will determine the correct
// elements kind with the site.
__ Mov(x2, instr->hydrogen()->site());
} else {
__ LoadRoot(x2, 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 to create a holey array; look at the first argument.
__ Peek(x10, 0);
__ Cbz(x10, &packed_case);
ElementsKind holey_kind = GetHoleyElementsKind(kind);
ArraySingleArgumentConstructorStub stub(isolate(),
holey_kind,
override_mode);
CallCode(stub.GetCode(), RelocInfo::CONSTRUCT_CALL, instr);
__ B(&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);
}
RecordPushedArgumentsDelta(instr->hydrogen()->argument_delta());
DCHECK(ToRegister(instr->result()).is(x0));
}
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()) {
__ Mov(cp, ToRegister(context));
} else if (context->IsStackSlot()) {
__ Ldr(cp, ToMemOperand(context, kMustUseFramePointer));
} else if (context->IsConstantOperand()) {
HConstant* constant =
chunk_->LookupConstant(LConstantOperand::cast(context));
__ LoadHeapObject(cp,
Handle<HeapObject>::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::RecordAndWritePosition(int position) {
if (position == RelocInfo::kNoPosition) return;
masm()->positions_recorder()->RecordPosition(position);
masm()->positions_recorder()->WriteRecordedPositions();
}
void LCodeGen::RecordSafepointWithLazyDeopt(LInstruction* instr,
SafepointMode safepoint_mode) {
if (safepoint_mode == RECORD_SIMPLE_SAFEPOINT) {
RecordSafepoint(instr->pointer_map(), Safepoint::kLazyDeopt);
} else {
DCHECK(safepoint_mode == RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS);
RecordSafepointWithRegisters(
instr->pointer_map(), 0, Safepoint::kLazyDeopt);
}
}
void LCodeGen::RecordSafepoint(LPointerMap* pointers,
Safepoint::Kind kind,
int arguments,
Safepoint::DeoptMode deopt_mode) {
DCHECK(expected_safepoint_kind_ == kind);
const ZoneList<LOperand*>* operands = pointers->GetNormalizedOperands();
Safepoint safepoint = safepoints_.DefineSafepoint(
masm(), kind, arguments, deopt_mode);
for (int i = 0; i < operands->length(); i++) {
LOperand* pointer = operands->at(i);
if (pointer->IsStackSlot()) {
safepoint.DefinePointerSlot(pointer->index(), zone());
} else if (pointer->IsRegister() && (kind & Safepoint::kWithRegisters)) {
safepoint.DefinePointerRegister(ToRegister(pointer), zone());
}
}
}
void LCodeGen::RecordSafepoint(LPointerMap* pointers,
Safepoint::DeoptMode deopt_mode) {
RecordSafepoint(pointers, Safepoint::kSimple, 0, deopt_mode);
}
void LCodeGen::RecordSafepoint(Safepoint::DeoptMode deopt_mode) {
LPointerMap empty_pointers(zone());
RecordSafepoint(&empty_pointers, deopt_mode);
}
void LCodeGen::RecordSafepointWithRegisters(LPointerMap* pointers,
int arguments,
Safepoint::DeoptMode deopt_mode) {
RecordSafepoint(pointers, Safepoint::kWithRegisters, arguments, deopt_mode);
}
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::SaveCallerDoubles() {
DCHECK(info()->saves_caller_doubles());
DCHECK(NeedsEagerFrame());
Comment(";;; Save clobbered callee double registers");
BitVector* doubles = chunk()->allocated_double_registers();
BitVector::Iterator iterator(doubles);
int count = 0;
while (!iterator.Done()) {
// TODO(all): Is this supposed to save just the callee-saved doubles? It
// looks like it's saving all of them.
FPRegister value = FPRegister::FromAllocationIndex(iterator.Current());
__ Poke(value, count * kDoubleSize);
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 iterator(doubles);
int count = 0;
while (!iterator.Done()) {
// TODO(all): Is this supposed to restore just the callee-saved doubles? It
// looks like it's restoring all of them.
FPRegister value = FPRegister::FromAllocationIndex(iterator.Current());
__ Peek(value, count * kDoubleSize);
iterator.Advance();
count++;
}
}
bool LCodeGen::GeneratePrologue() {
DCHECK(is_generating());
if (info()->IsOptimizing()) {
ProfileEntryHookStub::MaybeCallEntryHook(masm_);
// TODO(all): Add support for stop_t FLAG in DEBUG mode.
// Sloppy mode functions and builtins need to replace the receiver with the
// global proxy when called as functions (without an explicit receiver
// object).
if (is_sloppy(info_->language_mode()) && info()->MayUseThis() &&
!info()->is_native() && info()->scope()->has_this_declaration()) {
Label ok;
int receiver_offset = info_->scope()->num_parameters() * kXRegSize;
__ Peek(x10, receiver_offset);
__ JumpIfNotRoot(x10, Heap::kUndefinedValueRootIndex, &ok);
__ Ldr(x10, GlobalObjectMemOperand());
__ Ldr(x10, FieldMemOperand(x10, GlobalObject::kGlobalProxyOffset));
__ Poke(x10, receiver_offset);
__ Bind(&ok);
}
}
DCHECK(__ StackPointer().Is(jssp));
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) {
__ Claim(slots, kPointerSize);
}
if (info()->saves_caller_doubles()) {
SaveCallerDoubles();
}
// Allocate a local context if needed.
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 x1.
DCHECK(!info()->scope()->is_script_scope());
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(x1);
__ CallRuntime(Runtime::kNewFunctionContext, 1);
}
RecordSafepoint(Safepoint::kNoLazyDeopt);
// Context is returned in x0. It replaces the context passed to us. It's
// saved in the stack and kept live in cp.
__ Mov(cp, x0);
__ Str(x0, MemOperand(fp, StandardFrameConstants::kContextOffset));
// Copy any necessary parameters into the context.
int num_parameters = scope()->num_parameters();
int first_parameter = scope()->has_this_declaration() ? -1 : 0;
for (int i = first_parameter; i < num_parameters; i++) {
Variable* var = (i == -1) ? scope()->receiver() : scope()->parameter(i);
if (var->IsContextSlot()) {
Register value = x0;
Register scratch = x3;
int parameter_offset = StandardFrameConstants::kCallerSPOffset +
(num_parameters - 1 - i) * kPointerSize;
// Load parameter from stack.
__ Ldr(value, MemOperand(fp, parameter_offset));
// Store it in the context.
MemOperand target = ContextMemOperand(cp, var->index());
__ Str(value, target);
// Update the write barrier. This clobbers value and scratch.
if (need_write_barrier) {
__ RecordWriteContextSlot(cp, static_cast<int>(target.offset()),
value, scratch, GetLinkRegisterState(),
kSaveFPRegs);
} else if (FLAG_debug_code) {
Label done;
__ JumpIfInNewSpace(cp, &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);
__ Claim(slots);
}
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;
__ Push(lr, fp, cp);
__ Mov(fp, Smi::FromInt(StackFrame::STUB));
__ Push(fp);
__ Add(fp, __ StackPointer(),
StandardFrameConstants::kFixedFrameSizeFromFp);
Comment(";;; Deferred code");
}
code->Generate();
if (NeedsDeferredFrame()) {
Comment(";;; Destroy frame");
DCHECK(frame_is_built_);
__ Pop(xzr, cp, fp, lr);
frame_is_built_ = false;
}
__ B(code->exit());
}
}
// Force constant pool emission at the end of the deferred code to make
// sure that no constant pools are emitted after deferred code because
// deferred code generation is the last step which generates code. The two
// following steps will only output data used by crakshaft.
masm()->CheckConstPool(true, false);
return !is_aborted();
}
bool LCodeGen::GenerateJumpTable() {
Label needs_frame, call_deopt_entry;
if (jump_table_.length() > 0) {
Comment(";;; -------------------- Jump table --------------------");
Address base = jump_table_[0]->address;
UseScratchRegisterScope temps(masm());
Register entry_offset = temps.AcquireX();
int length = jump_table_.length();
for (int i = 0; i < length; i++) {
Deoptimizer::JumpTableEntry* table_entry = jump_table_[i];
__ Bind(&table_entry->label);
Address entry = table_entry->address;
DeoptComment(table_entry->deopt_info);
// Second-level deopt table entries are contiguous and small, so instead
// of loading the full, absolute address of each one, load the base
// address and add an immediate offset.
__ Mov(entry_offset, entry - base);
if (table_entry->needs_frame) {
DCHECK(!info()->saves_caller_doubles());
Comment(";;; call deopt with frame");
// Save lr before Bl, fp will be adjusted in the needs_frame code.
__ Push(lr, fp);
// Reuse the existing needs_frame code.
__ Bl(&needs_frame);
} else {
// There is nothing special to do, so just continue to the second-level
// table.
__ Bl(&call_deopt_entry);
}
info()->LogDeoptCallPosition(masm()->pc_offset(),
table_entry->deopt_info.inlining_id);
masm()->CheckConstPool(false, false);
}
if (needs_frame.is_linked()) {
// 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());
Comment(";;; needs_frame common code");
UseScratchRegisterScope temps(masm());
Register stub_marker = temps.AcquireX();
__ Bind(&needs_frame);
__ Mov(stub_marker, Smi::FromInt(StackFrame::STUB));
__ Push(cp, stub_marker);
__ Add(fp, __ StackPointer(), 2 * kPointerSize);
}
// Generate common code for calling the second-level deopt table.
__ Bind(&call_deopt_entry);
if (info()->saves_caller_doubles()) {
DCHECK(info()->IsStub());
RestoreCallerDoubles();
}
Register deopt_entry = temps.AcquireX();
__ Mov(deopt_entry, Operand(reinterpret_cast<uint64_t>(base),
RelocInfo::RUNTIME_ENTRY));
__ Add(deopt_entry, deopt_entry, entry_offset);
__ Br(deopt_entry);
}
// 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());
// We do not know how much data will be emitted for the safepoint table, so
// force emission of the veneer pool.
masm()->CheckVeneerPool(true, true);
safepoints_.Emit(masm(), GetStackSlotCount());
return !is_aborted();
}
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::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);
}
void LCodeGen::PopulateDeoptimizationLiteralsWithInlinedFunctions() {
DCHECK_EQ(0, deoptimization_literals_.length());
for (auto function : chunk()->inlined_functions()) {
DefineDeoptimizationLiteral(function);
}
inlined_function_count_ = deoptimization_literals_.length();
}
void LCodeGen::DeoptimizeBranch(
LInstruction* instr, Deoptimizer::DeoptReason deopt_reason,
BranchType branch_type, Register reg, int bit,
Deoptimizer::BailoutType* override_bailout_type) {
LEnvironment* environment = instr->environment();
RegisterEnvironmentForDeoptimization(environment, Safepoint::kNoLazyDeopt);
Deoptimizer::BailoutType bailout_type =
info()->IsStub() ? Deoptimizer::LAZY : Deoptimizer::EAGER;
if (override_bailout_type != NULL) {
bailout_type = *override_bailout_type;
}
DCHECK(environment->HasBeenRegistered());
DCHECK(info()->IsOptimizing() || info()->IsStub());
int id = environment->deoptimization_index();
Address entry =
Deoptimizer::GetDeoptimizationEntry(isolate(), id, bailout_type);
if (entry == NULL) {
Abort(kBailoutWasNotPrepared);
}
if (FLAG_deopt_every_n_times != 0 && !info()->IsStub()) {
Label not_zero;
ExternalReference count = ExternalReference::stress_deopt_count(isolate());
__ Push(x0, x1, x2);
__ Mrs(x2, NZCV);
__ Mov(x0, count);
__ Ldr(w1, MemOperand(x0));
__ Subs(x1, x1, 1);
__ B(gt, ¬_zero);
__ Mov(w1, FLAG_deopt_every_n_times);
__ Str(w1, MemOperand(x0));
__ Pop(x2, x1, x0);
DCHECK(frame_is_built_);
__ Call(entry, RelocInfo::RUNTIME_ENTRY);