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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/deoptimizer.h"
#include "src/lithium-codegen.h"
#include "src/mips/lithium-gap-resolver-mips.h"
#include "src/mips/lithium-mips.h"
#include "src/safepoint-table.h"
#include "src/scopes.h"
#include "src/utils.h"
namespace v8 {
namespace internal {
// Forward declarations.
class LDeferredCode;
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();
RAStatus GetRAState() const {
return frame_is_built_ ? kRAHasBeenSaved : kRAHasNotBeenSaved;
// Support for converting LOperands to assembler types.
// LOperand must be a register.
Register ToRegister(LOperand* op) const;
// LOperand is loaded into scratch, unless already a register.
Register EmitLoadRegister(LOperand* op, Register scratch);
// LOperand must be a double register.
DoubleRegister ToDoubleRegister(LOperand* op) const;
// LOperand is loaded into dbl_scratch, unless already a double register.
DoubleRegister EmitLoadDoubleRegister(LOperand* op,
FloatRegister flt_scratch,
DoubleRegister dbl_scratch);
int32_t ToRepresentation(LConstantOperand* op, const Representation& r) const;
int32_t ToInteger32(LConstantOperand* op) const;
Smi* ToSmi(LConstantOperand* op) const;
double ToDouble(LConstantOperand* op) const;
Operand ToOperand(LOperand* op);
MemOperand ToMemOperand(LOperand* op) const;
// Returns a MemOperand pointing to the high word of a DoubleStackSlot.
MemOperand ToHighMemOperand(LOperand* op) const;
bool IsInteger32(LConstantOperand* op) const;
bool IsSmi(LConstantOperand* op) const;
Handle<Object> ToHandle(LConstantOperand* op) const;
// 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);
void DoDeferredNumberTagD(LNumberTagD* instr);
enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
void DoDeferredNumberTagIU(LInstruction* instr,
LOperand* value,
LOperand* temp1,
LOperand* temp2,
IntegerSignedness signedness);
void DoDeferredTaggedToI(LTaggedToI* instr);
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 result,
Register object,
Register index);
// Parallel move support.
void DoParallelMove(LParallelMove* move);
void DoGap(LGap* instr);
MemOperand PrepareKeyedOperand(Register key,
Register base,
bool key_is_constant,
int constant_key,
int element_size,
int shift_size,
int base_offset);
// Emit frame translation commands for an environment.
void WriteTranslation(LEnvironment* environment, Translation* translation);
// 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_; }
Register scratch0() { return kLithiumScratchReg; }
Register scratch1() { return kLithiumScratchReg2; }
DoubleRegister double_scratch0() { return kLithiumScratchDouble; }
LInstruction* GetNextInstruction();
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()); }
void SaveCallerDoubles();
void RestoreCallerDoubles();
// Code generation passes. Returns true if code generation should
// continue.
void GenerateBodyInstructionPre(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* function,
int num_arguments,
LInstruction* instr,
SaveFPRegsMode save_doubles = kDontSaveFPRegs);
void CallRuntime(Runtime::FunctionId id,
int num_arguments,
LInstruction* instr) {
const Runtime::Function* function = Runtime::FunctionForId(id);
CallRuntime(function, num_arguments, instr);
void LoadContextFromDeferred(LOperand* context);
void CallRuntimeFromDeferred(Runtime::FunctionId id,
int argc,
LInstruction* instr,
LOperand* context);
// Generate a direct call to a known function. Expects the function
// to be in a1.
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 condition, LInstruction* instr,
Deoptimizer::DeoptReason deopt_reason,
Deoptimizer::BailoutType bailout_type,
Register src1 = zero_reg,
const Operand& src2 = Operand(zero_reg));
void DeoptimizeIf(
Condition condition, LInstruction* instr,
Deoptimizer::DeoptReason deopt_reason = Deoptimizer::kNoReason,
Register src1 = zero_reg, const Operand& src2 = Operand(zero_reg));
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;
DoubleRegister ToDoubleRegister(int index) const;
MemOperand 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 condition,
Register src1,
const Operand& src2);
template<class InstrType>
void EmitBranchF(InstrType instr,
Condition condition,
FPURegister src1,
FPURegister src2);
template<class InstrType>
void EmitFalseBranch(InstrType instr,
Condition condition,
Register src1,
const Operand& src2);
template<class InstrType>
void EmitFalseBranchF(InstrType instr,
Condition condition,
FPURegister src1,
FPURegister src2);
void EmitCmpI(LOperand* left, LOperand* right);
void EmitNumberUntagD(LNumberUntagD* instr, Register input,
DoubleRegister result, 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.
// Returns two registers in cmp1 and cmp2 that can be used in the
// Branch instruction after EmitTypeofIs.
Condition EmitTypeofIs(Label* true_label,
Label* false_label,
Register input,
Handle<String> type_name,
Register* cmp1,
Operand* cmp2);
// 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,
Register temp2,
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 temp1, Register temp2);
// 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);
// Emit optimized code for integer division.
// Inputs are signed.
// All registers are clobbered.
// If 'remainder' is no_reg, it is not computed.
void EmitSignedIntegerDivisionByConstant(Register result,
Register dividend,
int32_t divisor,
Register remainder,
Register scratch,
LEnvironment* environment);
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);
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_;
int osr_pc_offset_;
bool frame_is_built_;
// 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;
StoreRegistersStateStub stub(codegen_->isolate());
~PushSafepointRegistersScope() {
DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
RestoreRegistersStateStub stub(codegen_->isolate());
codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
LCodeGen* codegen_;
friend class LDeferredCode;
friend class LEnvironment;
friend class SafepointGenerator;
class LDeferredCode : public ZoneObject {
explicit LDeferredCode(LCodeGen* codegen)
: codegen_(codegen),
instruction_index_(codegen->current_instruction_) {
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_; }
int instruction_index() const { return instruction_index_; }
LCodeGen* codegen() const { return codegen_; }
MacroAssembler* masm() const { return codegen_->masm(); }
LCodeGen* codegen_;
Label entry_;
Label exit_;
Label* external_exit_;
int instruction_index_;
} } // namespace v8::internal