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| 1 // Copyright 2012 the V8 project authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef V8_IC_H_ | |
| 6 #define V8_IC_H_ | |
| 7 | |
| 8 #include "src/macro-assembler.h" | |
| 9 | |
| 10 namespace v8 { | |
| 11 namespace internal { | |
| 12 | |
| 13 | |
| 14 const int kMaxKeyedPolymorphism = 4; | |
| 15 | |
| 16 | |
| 17 // IC_UTIL_LIST defines all utility functions called from generated | |
| 18 // inline caching code. The argument for the macro, ICU, is the function name. | |
| 19 #define IC_UTIL_LIST(ICU) \ | |
| 20 ICU(LoadIC_Miss) \ | |
| 21 ICU(KeyedLoadIC_Miss) \ | |
| 22 ICU(CallIC_Miss) \ | |
| 23 ICU(CallIC_Customization_Miss) \ | |
| 24 ICU(StoreIC_Miss) \ | |
| 25 ICU(StoreIC_Slow) \ | |
| 26 ICU(SharedStoreIC_ExtendStorage) \ | |
| 27 ICU(KeyedStoreIC_Miss) \ | |
| 28 ICU(KeyedStoreIC_Slow) \ | |
| 29 /* Utilities for IC stubs. */ \ | |
| 30 ICU(StoreCallbackProperty) \ | |
| 31 ICU(LoadPropertyWithInterceptorOnly) \ | |
| 32 ICU(LoadPropertyWithInterceptor) \ | |
| 33 ICU(LoadElementWithInterceptor) \ | |
| 34 ICU(StorePropertyWithInterceptor) \ | |
| 35 ICU(CompareIC_Miss) \ | |
| 36 ICU(BinaryOpIC_Miss) \ | |
| 37 ICU(CompareNilIC_Miss) \ | |
| 38 ICU(Unreachable) \ | |
| 39 ICU(ToBooleanIC_Miss) | |
| 40 // | |
| 41 // IC is the base class for LoadIC, StoreIC, KeyedLoadIC, and KeyedStoreIC. | |
| 42 // | |
| 43 class IC { | |
| 44 public: | |
| 45 // The ids for utility called from the generated code. | |
| 46 enum UtilityId { | |
| 47 #define CONST_NAME(name) k##name, | |
| 48 IC_UTIL_LIST(CONST_NAME) | |
| 49 #undef CONST_NAME | |
| 50 kUtilityCount | |
| 51 }; | |
| 52 | |
| 53 // Looks up the address of the named utility. | |
| 54 static Address AddressFromUtilityId(UtilityId id); | |
| 55 | |
| 56 // Alias the inline cache state type to make the IC code more readable. | |
| 57 typedef InlineCacheState State; | |
| 58 | |
| 59 // The IC code is either invoked with no extra frames on the stack | |
| 60 // or with a single extra frame for supporting calls. | |
| 61 enum FrameDepth { | |
| 62 NO_EXTRA_FRAME = 0, | |
| 63 EXTRA_CALL_FRAME = 1 | |
| 64 }; | |
| 65 | |
| 66 // Construct the IC structure with the given number of extra | |
| 67 // JavaScript frames on the stack. | |
| 68 IC(FrameDepth depth, Isolate* isolate); | |
| 69 virtual ~IC() {} | |
| 70 | |
| 71 State state() const { return state_; } | |
| 72 inline Address address() const; | |
| 73 | |
| 74 // Compute the current IC state based on the target stub, receiver and name. | |
| 75 void UpdateState(Handle<Object> receiver, Handle<Object> name); | |
| 76 | |
| 77 bool IsNameCompatibleWithPrototypeFailure(Handle<Object> name); | |
| 78 void MarkPrototypeFailure(Handle<Object> name) { | |
| 79 DCHECK(IsNameCompatibleWithPrototypeFailure(name)); | |
| 80 state_ = PROTOTYPE_FAILURE; | |
| 81 } | |
| 82 | |
| 83 // If the stub contains weak maps then this function adds the stub to | |
| 84 // the dependent code array of each weak map. | |
| 85 static void RegisterWeakMapDependency(Handle<Code> stub); | |
| 86 | |
| 87 // This function is called when a weak map in the stub is dying, | |
| 88 // invalidates the stub by setting maps in it to undefined. | |
| 89 static void InvalidateMaps(Code* stub); | |
| 90 | |
| 91 // Clear the inline cache to initial state. | |
| 92 static void Clear(Isolate* isolate, | |
| 93 Address address, | |
| 94 ConstantPoolArray* constant_pool); | |
| 95 | |
| 96 #ifdef DEBUG | |
| 97 bool IsLoadStub() const { | |
| 98 return target()->is_load_stub() || target()->is_keyed_load_stub(); | |
| 99 } | |
| 100 | |
| 101 bool IsStoreStub() const { | |
| 102 return target()->is_store_stub() || target()->is_keyed_store_stub(); | |
| 103 } | |
| 104 | |
| 105 bool IsCallStub() const { | |
| 106 return target()->is_call_stub(); | |
| 107 } | |
| 108 #endif | |
| 109 | |
| 110 template <class TypeClass> | |
| 111 static JSFunction* GetRootConstructor(TypeClass* type, | |
| 112 Context* native_context); | |
| 113 static inline Handle<Map> GetHandlerCacheHolder(HeapType* type, | |
| 114 bool receiver_is_holder, | |
| 115 Isolate* isolate, | |
| 116 CacheHolderFlag* flag); | |
| 117 static inline Handle<Map> GetICCacheHolder(HeapType* type, Isolate* isolate, | |
| 118 CacheHolderFlag* flag); | |
| 119 | |
| 120 static bool IsCleared(Code* code) { | |
| 121 InlineCacheState state = code->ic_state(); | |
| 122 return state == UNINITIALIZED || state == PREMONOMORPHIC; | |
| 123 } | |
| 124 | |
| 125 // Utility functions to convert maps to types and back. There are two special | |
| 126 // cases: | |
| 127 // - The heap_number_map is used as a marker which includes heap numbers as | |
| 128 // well as smis. | |
| 129 // - The oddball map is only used for booleans. | |
| 130 static Handle<Map> TypeToMap(HeapType* type, Isolate* isolate); | |
| 131 template <class T> | |
| 132 static typename T::TypeHandle MapToType(Handle<Map> map, | |
| 133 typename T::Region* region); | |
| 134 | |
| 135 static Handle<HeapType> CurrentTypeOf(Handle<Object> object, | |
| 136 Isolate* isolate); | |
| 137 | |
| 138 protected: | |
| 139 // Get the call-site target; used for determining the state. | |
| 140 Handle<Code> target() const { return target_; } | |
| 141 | |
| 142 Address fp() const { return fp_; } | |
| 143 Address pc() const { return *pc_address_; } | |
| 144 Isolate* isolate() const { return isolate_; } | |
| 145 | |
| 146 // Get the shared function info of the caller. | |
| 147 SharedFunctionInfo* GetSharedFunctionInfo() const; | |
| 148 // Get the code object of the caller. | |
| 149 Code* GetCode() const; | |
| 150 // Get the original (non-breakpointed) code object of the caller. | |
| 151 Code* GetOriginalCode() const; | |
| 152 | |
| 153 // Set the call-site target. | |
| 154 void set_target(Code* code) { | |
| 155 #ifdef VERIFY_HEAP | |
| 156 code->VerifyEmbeddedObjectsDependency(); | |
| 157 #endif | |
| 158 SetTargetAtAddress(address(), code, constant_pool()); | |
| 159 target_set_ = true; | |
| 160 } | |
| 161 | |
| 162 bool is_target_set() { return target_set_; } | |
| 163 | |
| 164 char TransitionMarkFromState(IC::State state); | |
| 165 void TraceIC(const char* type, Handle<Object> name); | |
| 166 void TraceIC(const char* type, Handle<Object> name, State old_state, | |
| 167 State new_state); | |
| 168 | |
| 169 MaybeHandle<Object> TypeError(const char* type, | |
| 170 Handle<Object> object, | |
| 171 Handle<Object> key); | |
| 172 MaybeHandle<Object> ReferenceError(const char* type, Handle<Name> name); | |
| 173 | |
| 174 // Access the target code for the given IC address. | |
| 175 static inline Code* GetTargetAtAddress(Address address, | |
| 176 ConstantPoolArray* constant_pool); | |
| 177 static inline void SetTargetAtAddress(Address address, | |
| 178 Code* target, | |
| 179 ConstantPoolArray* constant_pool); | |
| 180 static void OnTypeFeedbackChanged(Isolate* isolate, Address address, | |
| 181 State old_state, State new_state, | |
| 182 bool target_remains_ic_stub); | |
| 183 static void PostPatching(Address address, Code* target, Code* old_target); | |
| 184 | |
| 185 // Compute the handler either by compiling or by retrieving a cached version. | |
| 186 Handle<Code> ComputeHandler(LookupIterator* lookup, | |
| 187 Handle<Object> value = Handle<Code>::null()); | |
| 188 virtual Handle<Code> CompileHandler(LookupIterator* lookup, | |
| 189 Handle<Object> value, | |
| 190 CacheHolderFlag cache_holder) { | |
| 191 UNREACHABLE(); | |
| 192 return Handle<Code>::null(); | |
| 193 } | |
| 194 | |
| 195 void UpdateMonomorphicIC(Handle<Code> handler, Handle<Name> name); | |
| 196 bool UpdatePolymorphicIC(Handle<Name> name, Handle<Code> code); | |
| 197 void UpdateMegamorphicCache(HeapType* type, Name* name, Code* code); | |
| 198 | |
| 199 void CopyICToMegamorphicCache(Handle<Name> name); | |
| 200 bool IsTransitionOfMonomorphicTarget(Map* source_map, Map* target_map); | |
| 201 void PatchCache(Handle<Name> name, Handle<Code> code); | |
| 202 Code::Kind kind() const { return kind_; } | |
| 203 Code::Kind handler_kind() const { | |
| 204 if (kind_ == Code::KEYED_LOAD_IC) return Code::LOAD_IC; | |
| 205 DCHECK(kind_ == Code::LOAD_IC || kind_ == Code::STORE_IC || | |
| 206 kind_ == Code::KEYED_STORE_IC); | |
| 207 return kind_; | |
| 208 } | |
| 209 virtual Handle<Code> megamorphic_stub() { | |
| 210 UNREACHABLE(); | |
| 211 return Handle<Code>::null(); | |
| 212 } | |
| 213 | |
| 214 bool TryRemoveInvalidPrototypeDependentStub(Handle<Object> receiver, | |
| 215 Handle<String> name); | |
| 216 | |
| 217 ExtraICState extra_ic_state() const { return extra_ic_state_; } | |
| 218 void set_extra_ic_state(ExtraICState state) { | |
| 219 extra_ic_state_ = state; | |
| 220 } | |
| 221 | |
| 222 Handle<HeapType> receiver_type() { return receiver_type_; } | |
| 223 void update_receiver_type(Handle<Object> receiver) { | |
| 224 receiver_type_ = CurrentTypeOf(receiver, isolate_); | |
| 225 } | |
| 226 | |
| 227 void TargetMaps(MapHandleList* list) { | |
| 228 FindTargetMaps(); | |
| 229 for (int i = 0; i < target_maps_.length(); i++) { | |
| 230 list->Add(target_maps_.at(i)); | |
| 231 } | |
| 232 } | |
| 233 | |
| 234 void TargetTypes(TypeHandleList* list) { | |
| 235 FindTargetMaps(); | |
| 236 for (int i = 0; i < target_maps_.length(); i++) { | |
| 237 list->Add(IC::MapToType<HeapType>(target_maps_.at(i), isolate_)); | |
| 238 } | |
| 239 } | |
| 240 | |
| 241 Map* FirstTargetMap() { | |
| 242 FindTargetMaps(); | |
| 243 return target_maps_.length() > 0 ? *target_maps_.at(0) : NULL; | |
| 244 } | |
| 245 | |
| 246 protected: | |
| 247 void UpdateTarget() { | |
| 248 target_ = handle(raw_target(), isolate_); | |
| 249 } | |
| 250 | |
| 251 private: | |
| 252 Code* raw_target() const { | |
| 253 return GetTargetAtAddress(address(), constant_pool()); | |
| 254 } | |
| 255 inline ConstantPoolArray* constant_pool() const; | |
| 256 inline ConstantPoolArray* raw_constant_pool() const; | |
| 257 | |
| 258 void FindTargetMaps() { | |
| 259 if (target_maps_set_) return; | |
| 260 target_maps_set_ = true; | |
| 261 if (state_ == MONOMORPHIC) { | |
| 262 Map* map = target_->FindFirstMap(); | |
| 263 if (map != NULL) target_maps_.Add(handle(map)); | |
| 264 } else if (state_ != UNINITIALIZED && state_ != PREMONOMORPHIC) { | |
| 265 target_->FindAllMaps(&target_maps_); | |
| 266 } | |
| 267 } | |
| 268 | |
| 269 // Frame pointer for the frame that uses (calls) the IC. | |
| 270 Address fp_; | |
| 271 | |
| 272 // All access to the program counter of an IC structure is indirect | |
| 273 // to make the code GC safe. This feature is crucial since | |
| 274 // GetProperty and SetProperty are called and they in turn might | |
| 275 // invoke the garbage collector. | |
| 276 Address* pc_address_; | |
| 277 | |
| 278 Isolate* isolate_; | |
| 279 | |
| 280 // The constant pool of the code which originally called the IC (which might | |
| 281 // be for the breakpointed copy of the original code). | |
| 282 Handle<ConstantPoolArray> raw_constant_pool_; | |
| 283 | |
| 284 // The original code target that missed. | |
| 285 Handle<Code> target_; | |
| 286 bool target_set_; | |
| 287 State state_; | |
| 288 Code::Kind kind_; | |
| 289 Handle<HeapType> receiver_type_; | |
| 290 MaybeHandle<Code> maybe_handler_; | |
| 291 | |
| 292 ExtraICState extra_ic_state_; | |
| 293 MapHandleList target_maps_; | |
| 294 bool target_maps_set_; | |
| 295 | |
| 296 DISALLOW_IMPLICIT_CONSTRUCTORS(IC); | |
| 297 }; | |
| 298 | |
| 299 | |
| 300 // An IC_Utility encapsulates IC::UtilityId. It exists mainly because you | |
| 301 // cannot make forward declarations to an enum. | |
| 302 class IC_Utility { | |
| 303 public: | |
| 304 explicit IC_Utility(IC::UtilityId id) | |
| 305 : address_(IC::AddressFromUtilityId(id)), id_(id) {} | |
| 306 | |
| 307 Address address() const { return address_; } | |
| 308 | |
| 309 IC::UtilityId id() const { return id_; } | |
| 310 private: | |
| 311 Address address_; | |
| 312 IC::UtilityId id_; | |
| 313 }; | |
| 314 | |
| 315 | |
| 316 class CallIC: public IC { | |
| 317 public: | |
| 318 enum CallType { METHOD, FUNCTION }; | |
| 319 | |
| 320 class State V8_FINAL BASE_EMBEDDED { | |
| 321 public: | |
| 322 explicit State(ExtraICState extra_ic_state); | |
| 323 | |
| 324 State(int argc, CallType call_type) | |
| 325 : argc_(argc), call_type_(call_type) { | |
| 326 } | |
| 327 | |
| 328 ExtraICState GetExtraICState() const; | |
| 329 | |
| 330 static void GenerateAheadOfTime( | |
| 331 Isolate*, void (*Generate)(Isolate*, const State&)); | |
| 332 | |
| 333 int arg_count() const { return argc_; } | |
| 334 CallType call_type() const { return call_type_; } | |
| 335 | |
| 336 bool CallAsMethod() const { return call_type_ == METHOD; } | |
| 337 | |
| 338 private: | |
| 339 class ArgcBits: public BitField<int, 0, Code::kArgumentsBits> {}; | |
| 340 class CallTypeBits: public BitField<CallType, Code::kArgumentsBits, 1> {}; | |
| 341 | |
| 342 const int argc_; | |
| 343 const CallType call_type_; | |
| 344 }; | |
| 345 | |
| 346 explicit CallIC(Isolate* isolate) | |
| 347 : IC(EXTRA_CALL_FRAME, isolate) { | |
| 348 } | |
| 349 | |
| 350 void PatchMegamorphic(Handle<Object> function, Handle<FixedArray> vector, | |
| 351 Handle<Smi> slot); | |
| 352 | |
| 353 void HandleMiss(Handle<Object> receiver, | |
| 354 Handle<Object> function, | |
| 355 Handle<FixedArray> vector, | |
| 356 Handle<Smi> slot); | |
| 357 | |
| 358 // Returns true if a custom handler was installed. | |
| 359 bool DoCustomHandler(Handle<Object> receiver, | |
| 360 Handle<Object> function, | |
| 361 Handle<FixedArray> vector, | |
| 362 Handle<Smi> slot, | |
| 363 const State& state); | |
| 364 | |
| 365 // Code generator routines. | |
| 366 static Handle<Code> initialize_stub(Isolate* isolate, | |
| 367 int argc, | |
| 368 CallType call_type); | |
| 369 | |
| 370 static void Clear(Isolate* isolate, Address address, Code* target, | |
| 371 ConstantPoolArray* constant_pool); | |
| 372 | |
| 373 private: | |
| 374 inline IC::State FeedbackToState(Handle<FixedArray> vector, | |
| 375 Handle<Smi> slot) const; | |
| 376 }; | |
| 377 | |
| 378 | |
| 379 OStream& operator<<(OStream& os, const CallIC::State& s); | |
| 380 | |
| 381 | |
| 382 class LoadIC: public IC { | |
| 383 public: | |
| 384 enum ParameterIndices { | |
| 385 kReceiverIndex, | |
| 386 kNameIndex, | |
| 387 kParameterCount | |
| 388 }; | |
| 389 static const Register ReceiverRegister(); | |
| 390 static const Register NameRegister(); | |
| 391 | |
| 392 // With flag vector-ics, there is an additional argument. And for calls from | |
| 393 // crankshaft, yet another. | |
| 394 static const Register SlotRegister(); | |
| 395 static const Register VectorRegister(); | |
| 396 | |
| 397 class State V8_FINAL BASE_EMBEDDED { | |
| 398 public: | |
| 399 explicit State(ExtraICState extra_ic_state) | |
| 400 : state_(extra_ic_state) {} | |
| 401 | |
| 402 explicit State(ContextualMode mode) | |
| 403 : state_(ContextualModeBits::encode(mode)) {} | |
| 404 | |
| 405 ExtraICState GetExtraICState() const { return state_; } | |
| 406 | |
| 407 ContextualMode contextual_mode() const { | |
| 408 return ContextualModeBits::decode(state_); | |
| 409 } | |
| 410 | |
| 411 private: | |
| 412 class ContextualModeBits: public BitField<ContextualMode, 0, 1> {}; | |
| 413 STATIC_ASSERT(static_cast<int>(NOT_CONTEXTUAL) == 0); | |
| 414 | |
| 415 const ExtraICState state_; | |
| 416 }; | |
| 417 | |
| 418 static ExtraICState ComputeExtraICState(ContextualMode contextual_mode) { | |
| 419 return State(contextual_mode).GetExtraICState(); | |
| 420 } | |
| 421 | |
| 422 static ContextualMode GetContextualMode(ExtraICState state) { | |
| 423 return State(state).contextual_mode(); | |
| 424 } | |
| 425 | |
| 426 ContextualMode contextual_mode() const { | |
| 427 return GetContextualMode(extra_ic_state()); | |
| 428 } | |
| 429 | |
| 430 explicit LoadIC(FrameDepth depth, Isolate* isolate) | |
| 431 : IC(depth, isolate) { | |
| 432 DCHECK(IsLoadStub()); | |
| 433 } | |
| 434 | |
| 435 // Returns if this IC is for contextual (no explicit receiver) | |
| 436 // access to properties. | |
| 437 bool IsUndeclaredGlobal(Handle<Object> receiver) { | |
| 438 if (receiver->IsGlobalObject()) { | |
| 439 return contextual_mode() == CONTEXTUAL; | |
| 440 } else { | |
| 441 DCHECK(contextual_mode() != CONTEXTUAL); | |
| 442 return false; | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 // Code generator routines. | |
| 447 static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); } | |
| 448 static void GeneratePreMonomorphic(MacroAssembler* masm) { | |
| 449 GenerateMiss(masm); | |
| 450 } | |
| 451 static void GenerateMiss(MacroAssembler* masm); | |
| 452 static void GenerateMegamorphic(MacroAssembler* masm); | |
| 453 static void GenerateNormal(MacroAssembler* masm); | |
| 454 static void GenerateRuntimeGetProperty(MacroAssembler* masm); | |
| 455 | |
| 456 static Handle<Code> initialize_stub(Isolate* isolate, | |
| 457 ExtraICState extra_state); | |
| 458 | |
| 459 MUST_USE_RESULT MaybeHandle<Object> Load(Handle<Object> object, | |
| 460 Handle<Name> name); | |
| 461 | |
| 462 protected: | |
| 463 void set_target(Code* code) { | |
| 464 // The contextual mode must be preserved across IC patching. | |
| 465 DCHECK(GetContextualMode(code->extra_ic_state()) == | |
| 466 GetContextualMode(target()->extra_ic_state())); | |
| 467 | |
| 468 IC::set_target(code); | |
| 469 } | |
| 470 | |
| 471 Handle<Code> slow_stub() const { | |
| 472 if (kind() == Code::LOAD_IC) { | |
| 473 return isolate()->builtins()->LoadIC_Slow(); | |
| 474 } else { | |
| 475 DCHECK_EQ(Code::KEYED_LOAD_IC, kind()); | |
| 476 return isolate()->builtins()->KeyedLoadIC_Slow(); | |
| 477 } | |
| 478 } | |
| 479 | |
| 480 virtual Handle<Code> megamorphic_stub(); | |
| 481 | |
| 482 // Update the inline cache and the global stub cache based on the | |
| 483 // lookup result. | |
| 484 void UpdateCaches(LookupIterator* lookup); | |
| 485 | |
| 486 virtual Handle<Code> CompileHandler(LookupIterator* lookup, | |
| 487 Handle<Object> unused, | |
| 488 CacheHolderFlag cache_holder); | |
| 489 | |
| 490 private: | |
| 491 virtual Handle<Code> pre_monomorphic_stub() const; | |
| 492 static Handle<Code> pre_monomorphic_stub(Isolate* isolate, | |
| 493 ExtraICState extra_state); | |
| 494 | |
| 495 Handle<Code> SimpleFieldLoad(FieldIndex index); | |
| 496 | |
| 497 static void Clear(Isolate* isolate, | |
| 498 Address address, | |
| 499 Code* target, | |
| 500 ConstantPoolArray* constant_pool); | |
| 501 | |
| 502 friend class IC; | |
| 503 }; | |
| 504 | |
| 505 | |
| 506 class KeyedLoadIC: public LoadIC { | |
| 507 public: | |
| 508 explicit KeyedLoadIC(FrameDepth depth, Isolate* isolate) | |
| 509 : LoadIC(depth, isolate) { | |
| 510 DCHECK(target()->is_keyed_load_stub()); | |
| 511 } | |
| 512 | |
| 513 MUST_USE_RESULT MaybeHandle<Object> Load(Handle<Object> object, | |
| 514 Handle<Object> key); | |
| 515 | |
| 516 // Code generator routines. | |
| 517 static void GenerateMiss(MacroAssembler* masm); | |
| 518 static void GenerateRuntimeGetProperty(MacroAssembler* masm); | |
| 519 static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); } | |
| 520 static void GeneratePreMonomorphic(MacroAssembler* masm) { | |
| 521 GenerateMiss(masm); | |
| 522 } | |
| 523 static void GenerateGeneric(MacroAssembler* masm); | |
| 524 static void GenerateString(MacroAssembler* masm); | |
| 525 static void GenerateIndexedInterceptor(MacroAssembler* masm); | |
| 526 static void GenerateSloppyArguments(MacroAssembler* masm); | |
| 527 | |
| 528 // Bit mask to be tested against bit field for the cases when | |
| 529 // generic stub should go into slow case. | |
| 530 // Access check is necessary explicitly since generic stub does not perform | |
| 531 // map checks. | |
| 532 static const int kSlowCaseBitFieldMask = | |
| 533 (1 << Map::kIsAccessCheckNeeded) | (1 << Map::kHasIndexedInterceptor); | |
| 534 | |
| 535 static Handle<Code> generic_stub(Isolate* isolate); | |
| 536 static Handle<Code> pre_monomorphic_stub(Isolate* isolate); | |
| 537 | |
| 538 protected: | |
| 539 Handle<Code> LoadElementStub(Handle<JSObject> receiver); | |
| 540 virtual Handle<Code> pre_monomorphic_stub() const { | |
| 541 return pre_monomorphic_stub(isolate()); | |
| 542 } | |
| 543 | |
| 544 private: | |
| 545 Handle<Code> generic_stub() const { return generic_stub(isolate()); } | |
| 546 Handle<Code> indexed_interceptor_stub() { | |
| 547 return isolate()->builtins()->KeyedLoadIC_IndexedInterceptor(); | |
| 548 } | |
| 549 Handle<Code> sloppy_arguments_stub() { | |
| 550 return isolate()->builtins()->KeyedLoadIC_SloppyArguments(); | |
| 551 } | |
| 552 Handle<Code> string_stub() { | |
| 553 return isolate()->builtins()->KeyedLoadIC_String(); | |
| 554 } | |
| 555 | |
| 556 static void Clear(Isolate* isolate, | |
| 557 Address address, | |
| 558 Code* target, | |
| 559 ConstantPoolArray* constant_pool); | |
| 560 | |
| 561 friend class IC; | |
| 562 }; | |
| 563 | |
| 564 | |
| 565 class StoreIC: public IC { | |
| 566 public: | |
| 567 class StrictModeState: public BitField<StrictMode, 1, 1> {}; | |
| 568 static ExtraICState ComputeExtraICState(StrictMode flag) { | |
| 569 return StrictModeState::encode(flag); | |
| 570 } | |
| 571 static StrictMode GetStrictMode(ExtraICState state) { | |
| 572 return StrictModeState::decode(state); | |
| 573 } | |
| 574 | |
| 575 // For convenience, a statically declared encoding of strict mode extra | |
| 576 // IC state. | |
| 577 static const ExtraICState kStrictModeState = | |
| 578 1 << StrictModeState::kShift; | |
| 579 | |
| 580 enum ParameterIndices { | |
| 581 kReceiverIndex, | |
| 582 kNameIndex, | |
| 583 kValueIndex, | |
| 584 kParameterCount | |
| 585 }; | |
| 586 static const Register ReceiverRegister(); | |
| 587 static const Register NameRegister(); | |
| 588 static const Register ValueRegister(); | |
| 589 | |
| 590 StoreIC(FrameDepth depth, Isolate* isolate) | |
| 591 : IC(depth, isolate) { | |
| 592 DCHECK(IsStoreStub()); | |
| 593 } | |
| 594 | |
| 595 StrictMode strict_mode() const { | |
| 596 return StrictModeState::decode(extra_ic_state()); | |
| 597 } | |
| 598 | |
| 599 // Code generators for stub routines. Only called once at startup. | |
| 600 static void GenerateSlow(MacroAssembler* masm); | |
| 601 static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); } | |
| 602 static void GeneratePreMonomorphic(MacroAssembler* masm) { | |
| 603 GenerateMiss(masm); | |
| 604 } | |
| 605 static void GenerateMiss(MacroAssembler* masm); | |
| 606 static void GenerateMegamorphic(MacroAssembler* masm); | |
| 607 static void GenerateNormal(MacroAssembler* masm); | |
| 608 static void GenerateRuntimeSetProperty(MacroAssembler* masm, | |
| 609 StrictMode strict_mode); | |
| 610 | |
| 611 static Handle<Code> initialize_stub(Isolate* isolate, | |
| 612 StrictMode strict_mode); | |
| 613 | |
| 614 MUST_USE_RESULT MaybeHandle<Object> Store( | |
| 615 Handle<Object> object, | |
| 616 Handle<Name> name, | |
| 617 Handle<Object> value, | |
| 618 JSReceiver::StoreFromKeyed store_mode = | |
| 619 JSReceiver::CERTAINLY_NOT_STORE_FROM_KEYED); | |
| 620 | |
| 621 bool LookupForWrite(LookupIterator* it, Handle<Object> value, | |
| 622 JSReceiver::StoreFromKeyed store_mode); | |
| 623 | |
| 624 protected: | |
| 625 virtual Handle<Code> megamorphic_stub(); | |
| 626 | |
| 627 // Stub accessors. | |
| 628 virtual Handle<Code> generic_stub() const; | |
| 629 | |
| 630 virtual Handle<Code> slow_stub() const { | |
| 631 return isolate()->builtins()->StoreIC_Slow(); | |
| 632 } | |
| 633 | |
| 634 virtual Handle<Code> pre_monomorphic_stub() const { | |
| 635 return pre_monomorphic_stub(isolate(), strict_mode()); | |
| 636 } | |
| 637 | |
| 638 static Handle<Code> pre_monomorphic_stub(Isolate* isolate, | |
| 639 StrictMode strict_mode); | |
| 640 | |
| 641 // Update the inline cache and the global stub cache based on the | |
| 642 // lookup result. | |
| 643 void UpdateCaches(LookupIterator* lookup, Handle<Object> value, | |
| 644 JSReceiver::StoreFromKeyed store_mode); | |
| 645 virtual Handle<Code> CompileHandler(LookupIterator* lookup, | |
| 646 Handle<Object> value, | |
| 647 CacheHolderFlag cache_holder); | |
| 648 | |
| 649 private: | |
| 650 void set_target(Code* code) { | |
| 651 // Strict mode must be preserved across IC patching. | |
| 652 DCHECK(GetStrictMode(code->extra_ic_state()) == | |
| 653 GetStrictMode(target()->extra_ic_state())); | |
| 654 IC::set_target(code); | |
| 655 } | |
| 656 | |
| 657 static void Clear(Isolate* isolate, | |
| 658 Address address, | |
| 659 Code* target, | |
| 660 ConstantPoolArray* constant_pool); | |
| 661 | |
| 662 friend class IC; | |
| 663 }; | |
| 664 | |
| 665 | |
| 666 enum KeyedStoreCheckMap { | |
| 667 kDontCheckMap, | |
| 668 kCheckMap | |
| 669 }; | |
| 670 | |
| 671 | |
| 672 enum KeyedStoreIncrementLength { | |
| 673 kDontIncrementLength, | |
| 674 kIncrementLength | |
| 675 }; | |
| 676 | |
| 677 | |
| 678 class KeyedStoreIC: public StoreIC { | |
| 679 public: | |
| 680 // ExtraICState bits (building on IC) | |
| 681 // ExtraICState bits | |
| 682 class ExtraICStateKeyedAccessStoreMode: | |
| 683 public BitField<KeyedAccessStoreMode, 2, 4> {}; // NOLINT | |
| 684 | |
| 685 static ExtraICState ComputeExtraICState(StrictMode flag, | |
| 686 KeyedAccessStoreMode mode) { | |
| 687 return StrictModeState::encode(flag) | | |
| 688 ExtraICStateKeyedAccessStoreMode::encode(mode); | |
| 689 } | |
| 690 | |
| 691 static KeyedAccessStoreMode GetKeyedAccessStoreMode( | |
| 692 ExtraICState extra_state) { | |
| 693 return ExtraICStateKeyedAccessStoreMode::decode(extra_state); | |
| 694 } | |
| 695 | |
| 696 // The map register isn't part of the normal call specification, but | |
| 697 // ElementsTransitionAndStoreStub, used in polymorphic keyed store | |
| 698 // stub implementations requires it to be initialized. | |
| 699 static const Register MapRegister(); | |
| 700 | |
| 701 KeyedStoreIC(FrameDepth depth, Isolate* isolate) | |
| 702 : StoreIC(depth, isolate) { | |
| 703 DCHECK(target()->is_keyed_store_stub()); | |
| 704 } | |
| 705 | |
| 706 MUST_USE_RESULT MaybeHandle<Object> Store(Handle<Object> object, | |
| 707 Handle<Object> name, | |
| 708 Handle<Object> value); | |
| 709 | |
| 710 // Code generators for stub routines. Only called once at startup. | |
| 711 static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); } | |
| 712 static void GeneratePreMonomorphic(MacroAssembler* masm) { | |
| 713 GenerateMiss(masm); | |
| 714 } | |
| 715 static void GenerateMiss(MacroAssembler* masm); | |
| 716 static void GenerateSlow(MacroAssembler* masm); | |
| 717 static void GenerateRuntimeSetProperty(MacroAssembler* masm, | |
| 718 StrictMode strict_mode); | |
| 719 static void GenerateGeneric(MacroAssembler* masm, StrictMode strict_mode); | |
| 720 static void GenerateSloppyArguments(MacroAssembler* masm); | |
| 721 | |
| 722 protected: | |
| 723 virtual Handle<Code> pre_monomorphic_stub() const { | |
| 724 return pre_monomorphic_stub(isolate(), strict_mode()); | |
| 725 } | |
| 726 static Handle<Code> pre_monomorphic_stub(Isolate* isolate, | |
| 727 StrictMode strict_mode) { | |
| 728 if (strict_mode == STRICT) { | |
| 729 return isolate->builtins()->KeyedStoreIC_PreMonomorphic_Strict(); | |
| 730 } else { | |
| 731 return isolate->builtins()->KeyedStoreIC_PreMonomorphic(); | |
| 732 } | |
| 733 } | |
| 734 virtual Handle<Code> slow_stub() const { | |
| 735 return isolate()->builtins()->KeyedStoreIC_Slow(); | |
| 736 } | |
| 737 virtual Handle<Code> megamorphic_stub() { | |
| 738 if (strict_mode() == STRICT) { | |
| 739 return isolate()->builtins()->KeyedStoreIC_Generic_Strict(); | |
| 740 } else { | |
| 741 return isolate()->builtins()->KeyedStoreIC_Generic(); | |
| 742 } | |
| 743 } | |
| 744 | |
| 745 Handle<Code> StoreElementStub(Handle<JSObject> receiver, | |
| 746 KeyedAccessStoreMode store_mode); | |
| 747 | |
| 748 private: | |
| 749 void set_target(Code* code) { | |
| 750 // Strict mode must be preserved across IC patching. | |
| 751 DCHECK(GetStrictMode(code->extra_ic_state()) == strict_mode()); | |
| 752 IC::set_target(code); | |
| 753 } | |
| 754 | |
| 755 // Stub accessors. | |
| 756 virtual Handle<Code> generic_stub() const { | |
| 757 if (strict_mode() == STRICT) { | |
| 758 return isolate()->builtins()->KeyedStoreIC_Generic_Strict(); | |
| 759 } else { | |
| 760 return isolate()->builtins()->KeyedStoreIC_Generic(); | |
| 761 } | |
| 762 } | |
| 763 | |
| 764 Handle<Code> sloppy_arguments_stub() { | |
| 765 return isolate()->builtins()->KeyedStoreIC_SloppyArguments(); | |
| 766 } | |
| 767 | |
| 768 static void Clear(Isolate* isolate, | |
| 769 Address address, | |
| 770 Code* target, | |
| 771 ConstantPoolArray* constant_pool); | |
| 772 | |
| 773 KeyedAccessStoreMode GetStoreMode(Handle<JSObject> receiver, | |
| 774 Handle<Object> key, | |
| 775 Handle<Object> value); | |
| 776 | |
| 777 Handle<Map> ComputeTransitionedMap(Handle<Map> map, | |
| 778 KeyedAccessStoreMode store_mode); | |
| 779 | |
| 780 friend class IC; | |
| 781 }; | |
| 782 | |
| 783 | |
| 784 // Mode to overwrite BinaryExpression values. | |
| 785 enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT }; | |
| 786 | |
| 787 // Type Recording BinaryOpIC, that records the types of the inputs and outputs. | |
| 788 class BinaryOpIC: public IC { | |
| 789 public: | |
| 790 class State V8_FINAL BASE_EMBEDDED { | |
| 791 public: | |
| 792 State(Isolate* isolate, ExtraICState extra_ic_state); | |
| 793 | |
| 794 State(Isolate* isolate, Token::Value op, OverwriteMode mode) | |
| 795 : op_(op), mode_(mode), left_kind_(NONE), right_kind_(NONE), | |
| 796 result_kind_(NONE), isolate_(isolate) { | |
| 797 DCHECK_LE(FIRST_TOKEN, op); | |
| 798 DCHECK_LE(op, LAST_TOKEN); | |
| 799 } | |
| 800 | |
| 801 InlineCacheState GetICState() const { | |
| 802 if (Max(left_kind_, right_kind_) == NONE) { | |
| 803 return ::v8::internal::UNINITIALIZED; | |
| 804 } | |
| 805 if (Max(left_kind_, right_kind_) == GENERIC) { | |
| 806 return ::v8::internal::MEGAMORPHIC; | |
| 807 } | |
| 808 if (Min(left_kind_, right_kind_) == GENERIC) { | |
| 809 return ::v8::internal::GENERIC; | |
| 810 } | |
| 811 return ::v8::internal::MONOMORPHIC; | |
| 812 } | |
| 813 | |
| 814 ExtraICState GetExtraICState() const; | |
| 815 | |
| 816 static void GenerateAheadOfTime( | |
| 817 Isolate*, void (*Generate)(Isolate*, const State&)); | |
| 818 | |
| 819 bool CanReuseDoubleBox() const { | |
| 820 return (result_kind_ > SMI && result_kind_ <= NUMBER) && | |
| 821 ((mode_ == OVERWRITE_LEFT && | |
| 822 left_kind_ > SMI && left_kind_ <= NUMBER) || | |
| 823 (mode_ == OVERWRITE_RIGHT && | |
| 824 right_kind_ > SMI && right_kind_ <= NUMBER)); | |
| 825 } | |
| 826 | |
| 827 // Returns true if the IC _could_ create allocation mementos. | |
| 828 bool CouldCreateAllocationMementos() const { | |
| 829 if (left_kind_ == STRING || right_kind_ == STRING) { | |
| 830 DCHECK_EQ(Token::ADD, op_); | |
| 831 return true; | |
| 832 } | |
| 833 return false; | |
| 834 } | |
| 835 | |
| 836 // Returns true if the IC _should_ create allocation mementos. | |
| 837 bool ShouldCreateAllocationMementos() const { | |
| 838 return FLAG_allocation_site_pretenuring && | |
| 839 CouldCreateAllocationMementos(); | |
| 840 } | |
| 841 | |
| 842 bool HasSideEffects() const { | |
| 843 return Max(left_kind_, right_kind_) == GENERIC; | |
| 844 } | |
| 845 | |
| 846 // Returns true if the IC should enable the inline smi code (i.e. if either | |
| 847 // parameter may be a smi). | |
| 848 bool UseInlinedSmiCode() const { | |
| 849 return KindMaybeSmi(left_kind_) || KindMaybeSmi(right_kind_); | |
| 850 } | |
| 851 | |
| 852 static const int FIRST_TOKEN = Token::BIT_OR; | |
| 853 static const int LAST_TOKEN = Token::MOD; | |
| 854 | |
| 855 Token::Value op() const { return op_; } | |
| 856 OverwriteMode mode() const { return mode_; } | |
| 857 Maybe<int> fixed_right_arg() const { return fixed_right_arg_; } | |
| 858 | |
| 859 Type* GetLeftType(Zone* zone) const { | |
| 860 return KindToType(left_kind_, zone); | |
| 861 } | |
| 862 Type* GetRightType(Zone* zone) const { | |
| 863 return KindToType(right_kind_, zone); | |
| 864 } | |
| 865 Type* GetResultType(Zone* zone) const; | |
| 866 | |
| 867 void Update(Handle<Object> left, | |
| 868 Handle<Object> right, | |
| 869 Handle<Object> result); | |
| 870 | |
| 871 Isolate* isolate() const { return isolate_; } | |
| 872 | |
| 873 private: | |
| 874 friend OStream& operator<<(OStream& os, const BinaryOpIC::State& s); | |
| 875 | |
| 876 enum Kind { NONE, SMI, INT32, NUMBER, STRING, GENERIC }; | |
| 877 | |
| 878 Kind UpdateKind(Handle<Object> object, Kind kind) const; | |
| 879 | |
| 880 static const char* KindToString(Kind kind); | |
| 881 static Type* KindToType(Kind kind, Zone* zone); | |
| 882 static bool KindMaybeSmi(Kind kind) { | |
| 883 return (kind >= SMI && kind <= NUMBER) || kind == GENERIC; | |
| 884 } | |
| 885 | |
| 886 // We truncate the last bit of the token. | |
| 887 STATIC_ASSERT(LAST_TOKEN - FIRST_TOKEN < (1 << 4)); | |
| 888 class OpField: public BitField<int, 0, 4> {}; | |
| 889 class OverwriteModeField: public BitField<OverwriteMode, 4, 2> {}; | |
| 890 class ResultKindField: public BitField<Kind, 6, 3> {}; | |
| 891 class LeftKindField: public BitField<Kind, 9, 3> {}; | |
| 892 // When fixed right arg is set, we don't need to store the right kind. | |
| 893 // Thus the two fields can overlap. | |
| 894 class HasFixedRightArgField: public BitField<bool, 12, 1> {}; | |
| 895 class FixedRightArgValueField: public BitField<int, 13, 4> {}; | |
| 896 class RightKindField: public BitField<Kind, 13, 3> {}; | |
| 897 | |
| 898 Token::Value op_; | |
| 899 OverwriteMode mode_; | |
| 900 Kind left_kind_; | |
| 901 Kind right_kind_; | |
| 902 Kind result_kind_; | |
| 903 Maybe<int> fixed_right_arg_; | |
| 904 Isolate* isolate_; | |
| 905 }; | |
| 906 | |
| 907 explicit BinaryOpIC(Isolate* isolate) : IC(EXTRA_CALL_FRAME, isolate) { } | |
| 908 | |
| 909 static Builtins::JavaScript TokenToJSBuiltin(Token::Value op); | |
| 910 | |
| 911 MaybeHandle<Object> Transition(Handle<AllocationSite> allocation_site, | |
| 912 Handle<Object> left, | |
| 913 Handle<Object> right) V8_WARN_UNUSED_RESULT; | |
| 914 }; | |
| 915 | |
| 916 | |
| 917 OStream& operator<<(OStream& os, const BinaryOpIC::State& s); | |
| 918 | |
| 919 | |
| 920 class CompareIC: public IC { | |
| 921 public: | |
| 922 // The type/state lattice is defined by the following inequations: | |
| 923 // UNINITIALIZED < ... | |
| 924 // ... < GENERIC | |
| 925 // SMI < NUMBER | |
| 926 // INTERNALIZED_STRING < STRING | |
| 927 // KNOWN_OBJECT < OBJECT | |
| 928 enum State { | |
| 929 UNINITIALIZED, | |
| 930 SMI, | |
| 931 NUMBER, | |
| 932 STRING, | |
| 933 INTERNALIZED_STRING, | |
| 934 UNIQUE_NAME, // Symbol or InternalizedString | |
| 935 OBJECT, // JSObject | |
| 936 KNOWN_OBJECT, // JSObject with specific map (faster check) | |
| 937 GENERIC | |
| 938 }; | |
| 939 | |
| 940 static State NewInputState(State old_state, Handle<Object> value); | |
| 941 | |
| 942 static Type* StateToType(Zone* zone, | |
| 943 State state, | |
| 944 Handle<Map> map = Handle<Map>()); | |
| 945 | |
| 946 static void StubInfoToType(uint32_t stub_key, Type** left_type, | |
| 947 Type** right_type, Type** overall_type, | |
| 948 Handle<Map> map, Zone* zone); | |
| 949 | |
| 950 CompareIC(Isolate* isolate, Token::Value op) | |
| 951 : IC(EXTRA_CALL_FRAME, isolate), op_(op) { } | |
| 952 | |
| 953 // Update the inline cache for the given operands. | |
| 954 Code* UpdateCaches(Handle<Object> x, Handle<Object> y); | |
| 955 | |
| 956 | |
| 957 // Factory method for getting an uninitialized compare stub. | |
| 958 static Handle<Code> GetUninitialized(Isolate* isolate, Token::Value op); | |
| 959 | |
| 960 // Helper function for computing the condition for a compare operation. | |
| 961 static Condition ComputeCondition(Token::Value op); | |
| 962 | |
| 963 static const char* GetStateName(State state); | |
| 964 | |
| 965 private: | |
| 966 static bool HasInlinedSmiCode(Address address); | |
| 967 | |
| 968 State TargetState(State old_state, | |
| 969 State old_left, | |
| 970 State old_right, | |
| 971 bool has_inlined_smi_code, | |
| 972 Handle<Object> x, | |
| 973 Handle<Object> y); | |
| 974 | |
| 975 bool strict() const { return op_ == Token::EQ_STRICT; } | |
| 976 Condition GetCondition() const { return ComputeCondition(op_); } | |
| 977 | |
| 978 static Code* GetRawUninitialized(Isolate* isolate, Token::Value op); | |
| 979 | |
| 980 static void Clear(Isolate* isolate, | |
| 981 Address address, | |
| 982 Code* target, | |
| 983 ConstantPoolArray* constant_pool); | |
| 984 | |
| 985 Token::Value op_; | |
| 986 | |
| 987 friend class IC; | |
| 988 }; | |
| 989 | |
| 990 | |
| 991 class CompareNilIC: public IC { | |
| 992 public: | |
| 993 explicit CompareNilIC(Isolate* isolate) : IC(EXTRA_CALL_FRAME, isolate) {} | |
| 994 | |
| 995 Handle<Object> CompareNil(Handle<Object> object); | |
| 996 | |
| 997 static Handle<Code> GetUninitialized(); | |
| 998 | |
| 999 static void Clear(Address address, | |
| 1000 Code* target, | |
| 1001 ConstantPoolArray* constant_pool); | |
| 1002 | |
| 1003 static Handle<Object> DoCompareNilSlow(Isolate* isolate, NilValue nil, | |
| 1004 Handle<Object> object); | |
| 1005 }; | |
| 1006 | |
| 1007 | |
| 1008 class ToBooleanIC: public IC { | |
| 1009 public: | |
| 1010 explicit ToBooleanIC(Isolate* isolate) : IC(EXTRA_CALL_FRAME, isolate) { } | |
| 1011 | |
| 1012 Handle<Object> ToBoolean(Handle<Object> object); | |
| 1013 }; | |
| 1014 | |
| 1015 | |
| 1016 // Helper for BinaryOpIC and CompareIC. | |
| 1017 enum InlinedSmiCheck { ENABLE_INLINED_SMI_CHECK, DISABLE_INLINED_SMI_CHECK }; | |
| 1018 void PatchInlinedSmiCode(Address address, InlinedSmiCheck check); | |
| 1019 | |
| 1020 DECLARE_RUNTIME_FUNCTION(KeyedLoadIC_MissFromStubFailure); | |
| 1021 DECLARE_RUNTIME_FUNCTION(KeyedStoreIC_MissFromStubFailure); | |
| 1022 DECLARE_RUNTIME_FUNCTION(UnaryOpIC_Miss); | |
| 1023 DECLARE_RUNTIME_FUNCTION(StoreIC_MissFromStubFailure); | |
| 1024 DECLARE_RUNTIME_FUNCTION(ElementsTransitionAndStoreIC_Miss); | |
| 1025 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_Miss); | |
| 1026 DECLARE_RUNTIME_FUNCTION(BinaryOpIC_MissWithAllocationSite); | |
| 1027 DECLARE_RUNTIME_FUNCTION(CompareNilIC_Miss); | |
| 1028 DECLARE_RUNTIME_FUNCTION(ToBooleanIC_Miss); | |
| 1029 | |
| 1030 | |
| 1031 } } // namespace v8::internal | |
| 1032 | |
| 1033 #endif // V8_IC_H_ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 483683005:
Move IC code into a subdir and move ic-compilation related code from stub-cache into ic-compiler (Closed)
Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge