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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.
#ifndef V8_X87_LITHIUM_CODEGEN_X87_H_
#define V8_X87_LITHIUM_CODEGEN_X87_H_
#include <map>
#include "src/x87/lithium-x87.h"
#include "src/base/logging.h"
#include "src/deoptimizer.h"
#include "src/lithium-codegen.h"
#include "src/safepoint-table.h"
#include "src/scopes.h"
#include "src/utils.h"
#include "src/x87/lithium-gap-resolver-x87.h"
namespace v8 {
namespace internal {
// Forward declarations.
class LDeferredCode;
class LGapNode;
class SafepointGenerator;
class LCodeGen: public LCodeGenBase {
LCodeGen(LChunk* chunk, MacroAssembler* assembler, CompilationInfo* info)
: LCodeGenBase(chunk, assembler, info),
deoptimizations_(4, info->zone()),
jump_table_(4, info->zone()),
deoptimization_literals_(8, info->zone()),
deferred_(8, info->zone()),
expected_safepoint_kind_(Safepoint::kSimple) {
int LookupDestination(int block_id) const {
return chunk()->LookupDestination(block_id);
bool IsNextEmittedBlock(int block_id) const {
return LookupDestination(block_id) == GetNextEmittedBlock();
bool NeedsEagerFrame() const {
return GetStackSlotCount() > 0 ||
info()->is_non_deferred_calling() ||
!info()->IsStub() ||
bool NeedsDeferredFrame() const {
return !NeedsEagerFrame() && info()->is_deferred_calling();
// Support for converting LOperands to assembler types.
Operand ToOperand(LOperand* op) const;
Register ToRegister(LOperand* op) const;
X87Register ToX87Register(LOperand* op) const;
bool IsInteger32(LConstantOperand* op) const;
bool IsSmi(LConstantOperand* op) const;
Immediate ToImmediate(LOperand* op, const Representation& r) const {
return Immediate(ToRepresentation(LConstantOperand::cast(op), r));
double ToDouble(LConstantOperand* op) const;
// Support for non-sse2 (x87) floating point stack handling.
// These functions maintain the mapping of physical stack registers to our
// virtual registers between instructions.
enum X87OperandType { kX87DoubleOperand, kX87FloatOperand, kX87IntOperand };
void X87Mov(X87Register reg, Operand src,
X87OperandType operand = kX87DoubleOperand);
void X87Mov(Operand src, X87Register reg,
X87OperandType operand = kX87DoubleOperand);
void X87Mov(X87Register reg, X87Register src,
X87OperandType operand = kX87DoubleOperand);
void X87PrepareBinaryOp(
X87Register left, X87Register right, X87Register result);
void X87LoadForUsage(X87Register reg);
void X87LoadForUsage(X87Register reg1, X87Register reg2);
void X87PrepareToWrite(X87Register reg) { x87_stack_.PrepareToWrite(reg); }
void X87CommitWrite(X87Register reg) { x87_stack_.CommitWrite(reg); }
void X87Fxch(X87Register reg, int other_slot = 0) {
x87_stack_.Fxch(reg, other_slot);
void X87Free(X87Register reg) {
bool X87StackEmpty() {
return x87_stack_.depth() == 0;
Handle<Object> ToHandle(LConstantOperand* op) const;
// The operand denoting the second word (the one with a higher address) of
// a double stack slot.
Operand HighOperand(LOperand* op);
// Try to generate code for the entire chunk, but it may fail if the
// chunk contains constructs we cannot handle. Returns true if the
// code generation attempt succeeded.
bool GenerateCode();
// Finish the code by setting stack height, safepoint, and bailout
// information on it.
void FinishCode(Handle<Code> code);
// Deferred code support.
void DoDeferredNumberTagD(LNumberTagD* instr);
enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
void DoDeferredNumberTagIU(LInstruction* instr,
LOperand* value,
LOperand* temp,
IntegerSignedness signedness);
void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
void DoDeferredStackCheck(LStackCheck* instr);
void DoDeferredStringCharCodeAt(LStringCharCodeAt* instr);
void DoDeferredStringCharFromCode(LStringCharFromCode* instr);
void DoDeferredAllocate(LAllocate* instr);
void DoDeferredInstanceOfKnownGlobal(LInstanceOfKnownGlobal* instr,
Label* map_check);
void DoDeferredInstanceMigration(LCheckMaps* instr, Register object);
void DoDeferredLoadMutableDouble(LLoadFieldByIndex* instr,
Register object,
Register index);
// Parallel move support.
void DoParallelMove(LParallelMove* move);
void DoGap(LGap* instr);
// Emit frame translation commands for an environment.
void WriteTranslation(LEnvironment* environment, Translation* translation);
void EnsureRelocSpaceForDeoptimization();
// Declare methods that deal with the individual node types.
#define DECLARE_DO(type) void Do##type(L##type* node);
LanguageMode language_mode() const { return info()->language_mode(); }
Scope* scope() const { return scope_; }
void EmitClassOfTest(Label* if_true,
Label* if_false,
Handle<String> class_name,
Register input,
Register temporary,
Register temporary2);
int GetStackSlotCount() const { return chunk()->spill_slot_count(); }
void AddDeferredCode(LDeferredCode* code) { deferred_.Add(code, zone()); }
// Code generation passes. Returns true if code generation should
// continue.
void GenerateBodyInstructionPre(LInstruction* instr) OVERRIDE;
void GenerateBodyInstructionPost(LInstruction* instr) OVERRIDE;
bool GeneratePrologue();
bool GenerateDeferredCode();
bool GenerateJumpTable();
bool GenerateSafepointTable();
// Generates the custom OSR entrypoint and sets the osr_pc_offset.
void GenerateOsrPrologue();
enum SafepointMode {
void CallCode(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr);
void CallCodeGeneric(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr,
SafepointMode safepoint_mode);
void CallRuntime(const Runtime::Function* fun, int argc, LInstruction* instr,
SaveFPRegsMode save_doubles = kDontSaveFPRegs);
void CallRuntime(Runtime::FunctionId id,
int argc,
LInstruction* instr) {
const Runtime::Function* function = Runtime::FunctionForId(id);
CallRuntime(function, argc, instr);
void CallRuntimeFromDeferred(Runtime::FunctionId id,
int argc,
LInstruction* instr,
LOperand* context);
void LoadContextFromDeferred(LOperand* context);
// Generate a direct call to a known function. Expects the function
// to be in edi.
void CallKnownFunction(Handle<JSFunction> function,
int formal_parameter_count, int arity,
LInstruction* instr);
void RecordSafepointWithLazyDeopt(LInstruction* instr,
SafepointMode safepoint_mode);
void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
Safepoint::DeoptMode mode);
void DeoptimizeIf(Condition cc, LInstruction* instr,
Deoptimizer::DeoptReason deopt_reason,
Deoptimizer::BailoutType bailout_type);
void DeoptimizeIf(Condition cc, LInstruction* instr,
Deoptimizer::DeoptReason deopt_reason);
bool DeoptEveryNTimes() {
return FLAG_deopt_every_n_times != 0 && !info()->IsStub();
void AddToTranslation(LEnvironment* environment,
Translation* translation,
LOperand* op,
bool is_tagged,
bool is_uint32,
int* object_index_pointer,
int* dematerialized_index_pointer);
void PopulateDeoptimizationData(Handle<Code> code);
int DefineDeoptimizationLiteral(Handle<Object> literal);
void PopulateDeoptimizationLiteralsWithInlinedFunctions();
Register ToRegister(int index) const;
X87Register ToX87Register(int index) const;
int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
int32_t ToInteger32(LConstantOperand* op) const;
ExternalReference ToExternalReference(LConstantOperand* op) const;
Operand BuildFastArrayOperand(LOperand* elements_pointer,
LOperand* key,
Representation key_representation,
ElementsKind elements_kind,
uint32_t base_offset);
Operand BuildSeqStringOperand(Register string,
LOperand* index,
String::Encoding encoding);
void EmitIntegerMathAbs(LMathAbs* instr);
// Support for recording safepoint and position information.
void RecordSafepoint(LPointerMap* pointers,
Safepoint::Kind kind,
int arguments,
Safepoint::DeoptMode mode);
void RecordSafepoint(LPointerMap* pointers, Safepoint::DeoptMode mode);
void RecordSafepoint(Safepoint::DeoptMode mode);
void RecordSafepointWithRegisters(LPointerMap* pointers,
int arguments,
Safepoint::DeoptMode mode);
void RecordAndWritePosition(int position) OVERRIDE;
static Condition TokenToCondition(Token::Value op, bool is_unsigned);
void EmitGoto(int block);
// EmitBranch expects to be the last instruction of a block.
template<class InstrType>
void EmitBranch(InstrType instr, Condition cc);
template<class InstrType>
void EmitFalseBranch(InstrType instr, Condition cc);
void EmitNumberUntagDNoSSE2(LNumberUntagD* instr, Register input,
Register temp, X87Register res_reg,
NumberUntagDMode mode);
// Emits optimized code for typeof x == "y". Modifies input register.
// Returns the condition on which a final split to
// true and false label should be made, to optimize fallthrough.
Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
// Emits optimized code for %_IsObject(x). Preserves input register.
// Returns the condition on which a final split to
// true and false label should be made, to optimize fallthrough.
Condition EmitIsObject(Register input,
Register temp1,
Label* is_not_object,
Label* is_object);
// Emits optimized code for %_IsString(x). Preserves input register.
// Returns the condition on which a final split to
// true and false label should be made, to optimize fallthrough.
Condition EmitIsString(Register input,
Register temp1,
Label* is_not_string,
SmiCheck check_needed);
// Emits optimized code for %_IsConstructCall().
// Caller should branch on equal condition.
void EmitIsConstructCall(Register temp);
// Emits optimized code to deep-copy the contents of statically known
// object graphs (e.g. object literal boilerplate).
void EmitDeepCopy(Handle<JSObject> object,
Register result,
Register source,
int* offset,
AllocationSiteMode mode);
void EnsureSpaceForLazyDeopt(int space_needed) OVERRIDE;
void DoLoadKeyedExternalArray(LLoadKeyed* instr);
void DoLoadKeyedFixedDoubleArray(LLoadKeyed* instr);
void DoLoadKeyedFixedArray(LLoadKeyed* instr);
void DoStoreKeyedExternalArray(LStoreKeyed* instr);
void DoStoreKeyedFixedDoubleArray(LStoreKeyed* instr);
void DoStoreKeyedFixedArray(LStoreKeyed* instr);
template <class T>
void EmitVectorLoadICRegisters(T* instr);
void EmitReturn(LReturn* instr, bool dynamic_frame_alignment);
// Emits code for pushing either a tagged constant, a (non-double)
// register, or a stack slot operand.
void EmitPushTaggedOperand(LOperand* operand);
void X87Fld(Operand src, X87OperandType opts);
void EmitFlushX87ForDeopt();
void FlushX87StackIfNecessary(LInstruction* instr) {
x87_stack_.FlushIfNecessary(instr, this);
friend class LGapResolver;
#ifdef _MSC_VER
// On windows, you may not access the stack more than one page below
// the most recently mapped page. To make the allocated area randomly
// accessible, we write an arbitrary value to each page in range
// esp + offset - page_size .. esp in turn.
void MakeSureStackPagesMapped(int offset);
ZoneList<LEnvironment*> deoptimizations_;
ZoneList<Deoptimizer::JumpTableEntry> jump_table_;
ZoneList<Handle<Object> > deoptimization_literals_;
int inlined_function_count_;
Scope* const scope_;
TranslationBuffer translations_;
ZoneList<LDeferredCode*> deferred_;
bool dynamic_frame_alignment_;
bool support_aligned_spilled_doubles_;
int osr_pc_offset_;
bool frame_is_built_;
class X87Stack : public ZoneObject {
explicit X87Stack(MacroAssembler* masm)
: stack_depth_(0), is_mutable_(true), masm_(masm) { }
explicit X87Stack(const X87Stack& other)
: stack_depth_(other.stack_depth_), is_mutable_(false), masm_(masm()) {
for (int i = 0; i < stack_depth_; i++) {
stack_[i] = other.stack_[i];
bool operator==(const X87Stack& other) const {
if (stack_depth_ != other.stack_depth_) return false;
for (int i = 0; i < stack_depth_; i++) {
if (!stack_[i].is(other.stack_[i])) return false;
return true;
X87Stack& operator=(const X87Stack& other) {
stack_depth_ = other.stack_depth_;
for (int i = 0; i < stack_depth_; i++) {
stack_[i] = other.stack_[i];
return *this;
bool Contains(X87Register reg);
void Fxch(X87Register reg, int other_slot = 0);
void Free(X87Register reg);
void PrepareToWrite(X87Register reg);
void CommitWrite(X87Register reg);
void FlushIfNecessary(LInstruction* instr, LCodeGen* cgen);
void LeavingBlock(int current_block_id, LGoto* goto_instr, LCodeGen* cgen);
int depth() const { return stack_depth_; }
int GetLayout();
int st(X87Register reg) { return st2idx(ArrayIndex(reg)); }
void pop() {
void push(X87Register reg) {
DCHECK(stack_depth_ < X87Register::kMaxNumAllocatableRegisters);
stack_[stack_depth_] = reg;
MacroAssembler* masm() const { return masm_; }
Isolate* isolate() const { return masm_->isolate(); }
int ArrayIndex(X87Register reg);
int st2idx(int pos);
X87Register stack_[X87Register::kMaxNumAllocatableRegisters];
int stack_depth_;
bool is_mutable_;
MacroAssembler* masm_;
X87Stack x87_stack_;
// block_id -> X87Stack*;
typedef std::map<int, X87Stack*> X87StackMap;
X87StackMap x87_stack_map_;
// Builder that keeps track of safepoints in the code. The table
// itself is emitted at the end of the generated code.
SafepointTableBuilder safepoints_;
// Compiler from a set of parallel moves to a sequential list of moves.
LGapResolver resolver_;
Safepoint::Kind expected_safepoint_kind_;
class PushSafepointRegistersScope FINAL BASE_EMBEDDED {
explicit PushSafepointRegistersScope(LCodeGen* codegen)
: codegen_(codegen) {
DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
~PushSafepointRegistersScope() {
DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
LCodeGen* codegen_;
friend class LDeferredCode;
friend class LEnvironment;
friend class SafepointGenerator;
friend class X87Stack;
class LDeferredCode : public ZoneObject {
explicit LDeferredCode(LCodeGen* codegen, const LCodeGen::X87Stack& x87_stack)
: codegen_(codegen),
x87_stack_(x87_stack) {
virtual ~LDeferredCode() {}
virtual void Generate() = 0;
virtual LInstruction* instr() = 0;
void SetExit(Label* exit) { external_exit_ = exit; }
Label* entry() { return &entry_; }
Label* exit() { return external_exit_ != NULL ? external_exit_ : &exit_; }
Label* done() { return codegen_->NeedsDeferredFrame() ? &done_ : exit(); }
int instruction_index() const { return instruction_index_; }
const LCodeGen::X87Stack& x87_stack() const { return x87_stack_; }
LCodeGen* codegen() const { return codegen_; }
MacroAssembler* masm() const { return codegen_->masm(); }
LCodeGen* codegen_;
Label entry_;
Label exit_;
Label* external_exit_;
Label done_;
int instruction_index_;
LCodeGen::X87Stack x87_stack_;
} } // namespace v8::internal
#endif // V8_X87_LITHIUM_CODEGEN_X87_H_