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1 // Copyright 2016 the V8 project authors. All rights reserved. | 1 // Copyright 2016 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/builtins/builtins-constructor-gen.h" | 5 #include "src/builtins/builtins-constructor-gen.h" |
6 | 6 |
7 #include "src/ast/ast.h" | 7 #include "src/ast/ast.h" |
8 #include "src/builtins/builtins-constructor.h" | 8 #include "src/builtins/builtins-constructor.h" |
9 #include "src/builtins/builtins-utils-gen.h" | 9 #include "src/builtins/builtins-utils-gen.h" |
10 #include "src/builtins/builtins.h" | 10 #include "src/builtins/builtins.h" |
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252 BIND(&allocate_properties); | 252 BIND(&allocate_properties); |
253 { | 253 { |
254 properties.Bind(AllocateNameDictionary(NameDictionary::kInitialCapacity)); | 254 properties.Bind(AllocateNameDictionary(NameDictionary::kInitialCapacity)); |
255 Goto(&instantiate_map); | 255 Goto(&instantiate_map); |
256 } | 256 } |
257 | 257 |
258 BIND(&instantiate_map); | 258 BIND(&instantiate_map); |
259 | 259 |
260 Node* object = AllocateJSObjectFromMap(initial_map, properties.value()); | 260 Node* object = AllocateJSObjectFromMap(initial_map, properties.value()); |
261 | 261 |
262 Node* instance_size_words = ChangeUint32ToWord(LoadObjectField( | |
263 initial_map, Map::kInstanceSizeOffset, MachineType::Uint8())); | |
264 Node* instance_size = | |
265 WordShl(instance_size_words, IntPtrConstant(kPointerSizeLog2)); | |
266 | |
267 // Perform in-object slack tracking if requested. | 262 // Perform in-object slack tracking if requested. |
268 Node* bit_field3 = LoadMapBitField3(initial_map); | 263 HandleSlackTracking(context, object, initial_map, JSObject::kHeaderSize); |
269 Label slack_tracking(this), finalize(this, Label::kDeferred), done(this); | |
270 GotoIf(IsSetWord32<Map::ConstructionCounter>(bit_field3), &slack_tracking); | |
271 | |
272 // Initialize remaining fields. | |
273 { | |
274 Comment("no slack tracking"); | |
275 InitializeFieldsWithRoot(object, IntPtrConstant(JSObject::kHeaderSize), | |
276 instance_size, Heap::kUndefinedValueRootIndex); | |
277 Goto(&end); | |
278 } | |
279 | |
280 { | |
281 BIND(&slack_tracking); | |
282 | |
283 // Decrease generous allocation count. | |
284 STATIC_ASSERT(Map::ConstructionCounter::kNext == 32); | |
285 Comment("update allocation count"); | |
286 Node* new_bit_field3 = Int32Sub( | |
287 bit_field3, Int32Constant(1 << Map::ConstructionCounter::kShift)); | |
288 StoreObjectFieldNoWriteBarrier(initial_map, Map::kBitField3Offset, | |
289 new_bit_field3, | |
290 MachineRepresentation::kWord32); | |
291 GotoIf(IsClearWord32<Map::ConstructionCounter>(new_bit_field3), &finalize); | |
292 | |
293 Node* unused_fields = LoadObjectField( | |
294 initial_map, Map::kUnusedPropertyFieldsOffset, MachineType::Uint8()); | |
295 Node* used_size = | |
296 IntPtrSub(instance_size, WordShl(ChangeUint32ToWord(unused_fields), | |
297 IntPtrConstant(kPointerSizeLog2))); | |
298 | |
299 Comment("initialize filler fields (no finalize)"); | |
300 InitializeFieldsWithRoot(object, used_size, instance_size, | |
301 Heap::kOnePointerFillerMapRootIndex); | |
302 | |
303 Comment("initialize undefined fields (no finalize)"); | |
304 InitializeFieldsWithRoot(object, IntPtrConstant(JSObject::kHeaderSize), | |
305 used_size, Heap::kUndefinedValueRootIndex); | |
306 Goto(&end); | |
307 } | |
308 | |
309 { | |
310 // Finalize the instance size. | |
311 BIND(&finalize); | |
312 | |
313 Node* unused_fields = LoadObjectField( | |
314 initial_map, Map::kUnusedPropertyFieldsOffset, MachineType::Uint8()); | |
315 Node* used_size = | |
316 IntPtrSub(instance_size, WordShl(ChangeUint32ToWord(unused_fields), | |
317 IntPtrConstant(kPointerSizeLog2))); | |
318 | |
319 Comment("initialize filler fields (finalize)"); | |
320 InitializeFieldsWithRoot(object, used_size, instance_size, | |
321 Heap::kOnePointerFillerMapRootIndex); | |
322 | |
323 Comment("initialize undefined fields (finalize)"); | |
324 InitializeFieldsWithRoot(object, IntPtrConstant(JSObject::kHeaderSize), | |
325 used_size, Heap::kUndefinedValueRootIndex); | |
326 | |
327 CallRuntime(Runtime::kFinalizeInstanceSize, context, initial_map); | |
328 Goto(&end); | |
329 } | |
330 | |
331 BIND(&end); | |
332 return object; | 264 return object; |
333 } | 265 } |
334 | 266 |
335 Node* ConstructorBuiltinsAssembler::EmitFastNewFunctionContext( | 267 Node* ConstructorBuiltinsAssembler::EmitFastNewFunctionContext( |
336 Node* function, Node* slots, Node* context, ScopeType scope_type) { | 268 Node* function, Node* slots, Node* context, ScopeType scope_type) { |
337 slots = ChangeUint32ToWord(slots); | 269 slots = ChangeUint32ToWord(slots); |
338 | 270 |
339 // TODO(ishell): Use CSA::OptimalParameterMode() here. | 271 // TODO(ishell): Use CSA::OptimalParameterMode() here. |
340 ParameterMode mode = INTPTR_PARAMETERS; | 272 ParameterMode mode = INTPTR_PARAMETERS; |
341 Node* min_context_slots = IntPtrConstant(Context::MIN_CONTEXT_SLOTS); | 273 Node* min_context_slots = IntPtrConstant(Context::MIN_CONTEXT_SLOTS); |
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736 SHALLOW_OBJECT_BUILTIN(0); | 668 SHALLOW_OBJECT_BUILTIN(0); |
737 SHALLOW_OBJECT_BUILTIN(1); | 669 SHALLOW_OBJECT_BUILTIN(1); |
738 SHALLOW_OBJECT_BUILTIN(2); | 670 SHALLOW_OBJECT_BUILTIN(2); |
739 SHALLOW_OBJECT_BUILTIN(3); | 671 SHALLOW_OBJECT_BUILTIN(3); |
740 SHALLOW_OBJECT_BUILTIN(4); | 672 SHALLOW_OBJECT_BUILTIN(4); |
741 SHALLOW_OBJECT_BUILTIN(5); | 673 SHALLOW_OBJECT_BUILTIN(5); |
742 SHALLOW_OBJECT_BUILTIN(6); | 674 SHALLOW_OBJECT_BUILTIN(6); |
743 | 675 |
744 } // namespace internal | 676 } // namespace internal |
745 } // namespace v8 | 677 } // namespace v8 |
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