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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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2662 1 << Map::kStringWrapperSafeForDefaultValueOf); | 2662 1 << Map::kStringWrapperSafeForDefaultValueOf); |
2663 __ j(not_zero, if_true); | 2663 __ j(not_zero, if_true); |
2664 | 2664 |
2665 // Check for fast case object. Return false for slow case objects. | 2665 // Check for fast case object. Return false for slow case objects. |
2666 __ mov(ecx, FieldOperand(eax, JSObject::kPropertiesOffset)); | 2666 __ mov(ecx, FieldOperand(eax, JSObject::kPropertiesOffset)); |
2667 __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset)); | 2667 __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset)); |
2668 __ cmp(ecx, FACTORY->hash_table_map()); | 2668 __ cmp(ecx, FACTORY->hash_table_map()); |
2669 __ j(equal, if_false); | 2669 __ j(equal, if_false); |
2670 | 2670 |
2671 // Look for valueOf symbol in the descriptor array, and indicate false if | 2671 // Look for valueOf symbol in the descriptor array, and indicate false if |
2672 // found. Since we omit an enumeration index check, if it is added via a | 2672 // found. The type is not checked, so if it is a transition it is a false |
2673 // transition that shares its descriptor array, this is a false positive. | 2673 // negative. |
2674 Label entry, loop, done; | |
2675 | |
2676 // Skip loop if no descriptors are valid. | |
2677 __ NumberOfOwnDescriptors(ecx, ebx); | |
2678 __ cmp(ecx, 0); | |
2679 __ j(equal, &done); | |
2680 | |
2681 __ LoadInstanceDescriptors(ebx, ebx); | 2674 __ LoadInstanceDescriptors(ebx, ebx); |
2682 // ebx: descriptor array. | 2675 __ mov(ecx, FieldOperand(ebx, FixedArray::kLengthOffset)); |
2683 // ecx: valid entries in the descriptor array. | 2676 // ebx: descriptor array |
| 2677 // ecx: length of descriptor array |
2684 // Calculate the end of the descriptor array. | 2678 // Calculate the end of the descriptor array. |
2685 STATIC_ASSERT(kSmiTag == 0); | 2679 STATIC_ASSERT(kSmiTag == 0); |
2686 STATIC_ASSERT(kSmiTagSize == 1); | 2680 STATIC_ASSERT(kSmiTagSize == 1); |
2687 STATIC_ASSERT(kPointerSize == 4); | 2681 STATIC_ASSERT(kPointerSize == 4); |
2688 __ imul(ecx, ecx, DescriptorArray::kDescriptorSize); | 2682 __ lea(ecx, Operand(ebx, ecx, times_2, FixedArray::kHeaderSize)); |
2689 __ lea(ecx, Operand(ebx, ecx, times_2, DescriptorArray::kFirstOffset)); | |
2690 // Calculate location of the first key name. | 2683 // Calculate location of the first key name. |
2691 __ add(ebx, Immediate(DescriptorArray::kFirstOffset)); | 2684 __ add(ebx, Immediate(DescriptorArray::kFirstOffset)); |
2692 // Loop through all the keys in the descriptor array. If one of these is the | 2685 // Loop through all the keys in the descriptor array. If one of these is the |
2693 // symbol valueOf the result is false. | 2686 // symbol valueOf the result is false. |
| 2687 Label entry, loop; |
2694 __ jmp(&entry); | 2688 __ jmp(&entry); |
2695 __ bind(&loop); | 2689 __ bind(&loop); |
2696 __ mov(edx, FieldOperand(ebx, 0)); | 2690 __ mov(edx, FieldOperand(ebx, 0)); |
2697 __ cmp(edx, FACTORY->value_of_symbol()); | 2691 __ cmp(edx, FACTORY->value_of_symbol()); |
2698 __ j(equal, if_false); | 2692 __ j(equal, if_false); |
2699 __ add(ebx, Immediate(DescriptorArray::kDescriptorSize * kPointerSize)); | 2693 __ add(ebx, Immediate(DescriptorArray::kDescriptorSize * kPointerSize)); |
2700 __ bind(&entry); | 2694 __ bind(&entry); |
2701 __ cmp(ebx, ecx); | 2695 __ cmp(ebx, ecx); |
2702 __ j(not_equal, &loop); | 2696 __ j(not_equal, &loop); |
2703 | 2697 |
2704 __ bind(&done); | |
2705 | |
2706 // Reload map as register ebx was used as temporary above. | 2698 // Reload map as register ebx was used as temporary above. |
2707 __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset)); | 2699 __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset)); |
2708 | 2700 |
2709 // If a valueOf property is not found on the object check that its | 2701 // If a valueOf property is not found on the object check that it's |
2710 // prototype is the un-modified String prototype. If not result is false. | 2702 // prototype is the un-modified String prototype. If not result is false. |
2711 __ mov(ecx, FieldOperand(ebx, Map::kPrototypeOffset)); | 2703 __ mov(ecx, FieldOperand(ebx, Map::kPrototypeOffset)); |
2712 __ JumpIfSmi(ecx, if_false); | 2704 __ JumpIfSmi(ecx, if_false); |
2713 __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset)); | 2705 __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset)); |
2714 __ mov(edx, Operand(esi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX))); | 2706 __ mov(edx, Operand(esi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX))); |
2715 __ mov(edx, | 2707 __ mov(edx, |
2716 FieldOperand(edx, GlobalObject::kNativeContextOffset)); | 2708 FieldOperand(edx, GlobalObject::kNativeContextOffset)); |
2717 __ cmp(ecx, | 2709 __ cmp(ecx, |
2718 ContextOperand(edx, | 2710 ContextOperand(edx, |
2719 Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX)); | 2711 Context::STRING_FUNCTION_PROTOTYPE_MAP_INDEX)); |
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4563 *stack_depth = 0; | 4555 *stack_depth = 0; |
4564 *context_length = 0; | 4556 *context_length = 0; |
4565 return previous_; | 4557 return previous_; |
4566 } | 4558 } |
4567 | 4559 |
4568 #undef __ | 4560 #undef __ |
4569 | 4561 |
4570 } } // namespace v8::internal | 4562 } } // namespace v8::internal |
4571 | 4563 |
4572 #endif // V8_TARGET_ARCH_IA32 | 4564 #endif // V8_TARGET_ARCH_IA32 |
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