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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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2405 | 2405 |
2406 | 2406 |
2407 void LCodeGen::EmitLoadFieldOrConstantFunction(Register result, | 2407 void LCodeGen::EmitLoadFieldOrConstantFunction(Register result, |
2408 Register object, | 2408 Register object, |
2409 Handle<Map> type, | 2409 Handle<Map> type, |
2410 Handle<String> name, | 2410 Handle<String> name, |
2411 LEnvironment* env) { | 2411 LEnvironment* env) { |
2412 LookupResult lookup(isolate()); | 2412 LookupResult lookup(isolate()); |
2413 type->LookupInDescriptors(NULL, *name, &lookup); | 2413 type->LookupInDescriptors(NULL, *name, &lookup); |
2414 ASSERT(lookup.IsFound() || lookup.IsCacheable()); | 2414 ASSERT(lookup.IsFound() || lookup.IsCacheable()); |
2415 if (lookup.IsFound() && lookup.type() == FIELD) { | 2415 if (lookup.IsField()) { |
2416 int index = lookup.GetLocalFieldIndexFromMap(*type); | 2416 int index = lookup.GetLocalFieldIndexFromMap(*type); |
2417 int offset = index * kPointerSize; | 2417 int offset = index * kPointerSize; |
2418 if (index < 0) { | 2418 if (index < 0) { |
2419 // Negative property indices are in-object properties, indexed | 2419 // Negative property indices are in-object properties, indexed |
2420 // from the end of the fixed part of the object. | 2420 // from the end of the fixed part of the object. |
2421 __ mov(result, FieldOperand(object, offset + type->instance_size())); | 2421 __ mov(result, FieldOperand(object, offset + type->instance_size())); |
2422 } else { | 2422 } else { |
2423 // Non-negative property indices are in the properties array. | 2423 // Non-negative property indices are in the properties array. |
2424 __ mov(result, FieldOperand(object, JSObject::kPropertiesOffset)); | 2424 __ mov(result, FieldOperand(object, JSObject::kPropertiesOffset)); |
2425 __ mov(result, FieldOperand(result, offset + FixedArray::kHeaderSize)); | 2425 __ mov(result, FieldOperand(result, offset + FixedArray::kHeaderSize)); |
2426 } | 2426 } |
2427 } else if (lookup.IsFound() && lookup.type() == CONSTANT_FUNCTION) { | 2427 } else if (lookup.IsConstantFunction()) { |
2428 Handle<JSFunction> function(lookup.GetConstantFunctionFromMap(*type)); | 2428 Handle<JSFunction> function(lookup.GetConstantFunctionFromMap(*type)); |
2429 __ LoadHeapObject(result, function); | 2429 __ LoadHeapObject(result, function); |
2430 } else { | 2430 } else { |
2431 // Negative lookup. | 2431 // Negative lookup. |
2432 // Check prototypes. | 2432 // Check prototypes. |
2433 Handle<HeapObject> current(HeapObject::cast((*type)->prototype())); | 2433 Handle<HeapObject> current(HeapObject::cast((*type)->prototype())); |
2434 Heap* heap = type->GetHeap(); | 2434 Heap* heap = type->GetHeap(); |
2435 while (*current != heap->null_value()) { | 2435 while (*current != heap->null_value()) { |
2436 __ LoadHeapObject(result, current); | 2436 __ LoadHeapObject(result, current); |
2437 __ cmp(FieldOperand(result, HeapObject::kMapOffset), | 2437 __ cmp(FieldOperand(result, HeapObject::kMapOffset), |
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2462 } | 2462 } |
2463 | 2463 |
2464 | 2464 |
2465 // Check for cases where EmitLoadFieldOrConstantFunction needs to walk the | 2465 // Check for cases where EmitLoadFieldOrConstantFunction needs to walk the |
2466 // prototype chain, which causes unbounded code generation. | 2466 // prototype chain, which causes unbounded code generation. |
2467 static bool CompactEmit( | 2467 static bool CompactEmit( |
2468 SmallMapList* list, Handle<String> name, int i, Isolate* isolate) { | 2468 SmallMapList* list, Handle<String> name, int i, Isolate* isolate) { |
2469 LookupResult lookup(isolate); | 2469 LookupResult lookup(isolate); |
2470 Handle<Map> map = list->at(i); | 2470 Handle<Map> map = list->at(i); |
2471 map->LookupInDescriptors(NULL, *name, &lookup); | 2471 map->LookupInDescriptors(NULL, *name, &lookup); |
2472 return lookup.IsFound() && | 2472 return lookup.IsField() || lookup.IsConstantFunction(); |
2473 (lookup.type() == FIELD || lookup.type() == CONSTANT_FUNCTION); | |
2474 } | 2473 } |
2475 | 2474 |
2476 | 2475 |
2477 void LCodeGen::DoLoadNamedFieldPolymorphic(LLoadNamedFieldPolymorphic* instr) { | 2476 void LCodeGen::DoLoadNamedFieldPolymorphic(LLoadNamedFieldPolymorphic* instr) { |
2478 Register object = ToRegister(instr->object()); | 2477 Register object = ToRegister(instr->object()); |
2479 Register result = ToRegister(instr->result()); | 2478 Register result = ToRegister(instr->result()); |
2480 | 2479 |
2481 int map_count = instr->hydrogen()->types()->length(); | 2480 int map_count = instr->hydrogen()->types()->length(); |
2482 bool need_generic = instr->hydrogen()->need_generic(); | 2481 bool need_generic = instr->hydrogen()->need_generic(); |
2483 | 2482 |
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5332 FixedArray::kHeaderSize - kPointerSize)); | 5331 FixedArray::kHeaderSize - kPointerSize)); |
5333 __ bind(&done); | 5332 __ bind(&done); |
5334 } | 5333 } |
5335 | 5334 |
5336 | 5335 |
5337 #undef __ | 5336 #undef __ |
5338 | 5337 |
5339 } } // namespace v8::internal | 5338 } } // namespace v8::internal |
5340 | 5339 |
5341 #endif // V8_TARGET_ARCH_IA32 | 5340 #endif // V8_TARGET_ARCH_IA32 |
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