deps/v8/src/x64/lithium-codegen-x64.h
// 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_X64_LITHIUM_CODEGEN_X64_H_
#define V8_X64_LITHIUM_CODEGEN_X64_H_
#include "src/x64/lithium-x64.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/x64/lithium-gap-resolver-x64.h"
namespace v8 {
namespace internal {
// Forward declarations.
class LDeferredCode;
class SafepointGenerator;
class LCodeGen: public LCodeGenBase {
public:
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()),
inlined_function_count_(0),
scope_(info->scope()),
translations_(info->zone()),
deferred_(8, info->zone()),
osr_pc_offset_(-1),
frame_is_built_(false),
safepoints_(info->zone()),
resolver_(this),
expected_safepoint_kind_(Safepoint::kSimple) {
PopulateDeoptimizationLiteralsWithInlinedFunctions();
}
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() ||
info()->requires_frame();
}
bool NeedsDeferredFrame() const {
return !NeedsEagerFrame() && info()->is_deferred_calling();
}
// Support for converting LOperands to assembler types.
Register ToRegister(LOperand* op) const;
XMMRegister ToDoubleRegister(LOperand* op) const;
bool IsInteger32Constant(LConstantOperand* op) const;
bool IsDehoistedKeyConstant(LConstantOperand* op) const;
bool IsSmiConstant(LConstantOperand* op) const;
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;
ExternalReference ToExternalReference(LConstantOperand* op) const;
Handle<Object> ToHandle(LConstantOperand* op) const;
Operand ToOperand(LOperand* 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);
// Deferred code support.
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, 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);
// Declare methods that deal with the individual node types.
#define DECLARE_DO(type) void Do##type(L##type* node);
LITHIUM_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)
#undef DECLARE_DO
private:
StrictMode strict_mode() const { return info()->strict_mode(); }
LPlatformChunk* chunk() const { return chunk_; }
Scope* scope() const { return scope_; }
HGraph* graph() const { return chunk()->graph(); }
XMMRegister double_scratch0() const { return xmm0; }
void EmitClassOfTest(Label* if_true,
Label* if_false,
Handle<String> class_name,
Register input,
Register temporary,
Register scratch);
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) V8_OVERRIDE;
void GenerateBodyInstructionPost(LInstruction* instr) V8_OVERRIDE;
bool GeneratePrologue();
bool GenerateDeferredCode();
bool GenerateJumpTable();
bool GenerateSafepointTable();
// Generates the custom OSR entrypoint and sets the osr_pc_offset.
void GenerateOsrPrologue();
enum SafepointMode {
RECORD_SIMPLE_SAFEPOINT,
RECORD_SAFEPOINT_WITH_REGISTERS
};
void CallCodeGeneric(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr,
SafepointMode safepoint_mode,
int argc);
void CallCode(Handle<Code> code,
RelocInfo::Mode mode,
LInstruction* instr);
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 CallRuntimeFromDeferred(Runtime::FunctionId id,
int argc,
LInstruction* instr,
LOperand* context);
void LoadContextFromDeferred(LOperand* context);
enum RDIState {
RDI_UNINITIALIZED,
RDI_CONTAINS_TARGET
};
// Generate a direct call to a known function. Expects the function
// to be in rdi.
void CallKnownFunction(Handle<JSFunction> function,
int formal_parameter_count,
int arity,
LInstruction* instr,
RDIState rdi_state);
void RecordSafepointWithLazyDeopt(LInstruction* instr,
SafepointMode safepoint_mode,
int argc);
void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
Safepoint::DeoptMode mode);
void DeoptimizeIf(Condition cc,
LEnvironment* environment,
Deoptimizer::BailoutType bailout_type);
void DeoptimizeIf(Condition cc, LEnvironment* environment);
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;
XMMRegister ToDoubleRegister(int index) 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);
void EmitSmiMathAbs(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) V8_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 EmitNumberUntagD(
Register input,
XMMRegister result,
bool allow_undefined_as_nan,
bool deoptimize_on_minus_zero,
LEnvironment* env,
NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED);
// 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,
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 code for pushing either a tagged constant, a (non-double)
// register, or a stack slot operand.
void EmitPushTaggedOperand(LOperand* operand);
// 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) V8_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);
#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
// rsp + offset - page_size .. rsp in turn.
void MakeSureStackPagesMapped(int offset);
#endif
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 V8_FINAL BASE_EMBEDDED {
public:
explicit PushSafepointRegistersScope(LCodeGen* codegen)
: codegen_(codegen) {
DCHECK(codegen_->info()->is_calling());
DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kSimple);
codegen_->masm_->PushSafepointRegisters();
codegen_->expected_safepoint_kind_ = Safepoint::kWithRegisters;
}
~PushSafepointRegistersScope() {
DCHECK(codegen_->expected_safepoint_kind_ == Safepoint::kWithRegisters);
codegen_->masm_->PopSafepointRegisters();
codegen_->expected_safepoint_kind_ = Safepoint::kSimple;
}
private:
LCodeGen* codegen_;
};
friend class LDeferredCode;
friend class LEnvironment;
friend class SafepointGenerator;
DISALLOW_COPY_AND_ASSIGN(LCodeGen);
};
class LDeferredCode: public ZoneObject {
public:
explicit LDeferredCode(LCodeGen* codegen)
: codegen_(codegen),
external_exit_(NULL),
instruction_index_(codegen->current_instruction_) {
codegen->AddDeferredCode(this);
}
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_; }
protected:
LCodeGen* codegen() const { return codegen_; }
MacroAssembler* masm() const { return codegen_->masm(); }
private:
LCodeGen* codegen_;
Label entry_;
Label exit_;
Label done_;
Label* external_exit_;
int instruction_index_;
};
} } // namespace v8::internal
#endif // V8_X64_LITHIUM_CODEGEN_X64_H_