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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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599 | 599 |
600 template<typename StaticVisitor> | 600 template<typename StaticVisitor> |
601 bool StaticMarkingVisitor<StaticVisitor>::IsFlushable( | 601 bool StaticMarkingVisitor<StaticVisitor>::IsFlushable( |
602 Heap* heap, JSFunction* function) { | 602 Heap* heap, JSFunction* function) { |
603 SharedFunctionInfo* shared_info = function->shared(); | 603 SharedFunctionInfo* shared_info = function->shared(); |
604 | 604 |
605 // Code is either on stack, in compilation cache or referenced | 605 // Code is either on stack, in compilation cache or referenced |
606 // by optimized version of function. | 606 // by optimized version of function. |
607 MarkBit code_mark = Marking::MarkBitFrom(function->code()); | 607 MarkBit code_mark = Marking::MarkBitFrom(function->code()); |
608 if (code_mark.Get()) { | 608 if (code_mark.Get()) { |
609 if (!FLAG_age_code) { | |
610 if (!Marking::MarkBitFrom(shared_info).Get()) { | |
611 shared_info->set_code_age(0); | |
612 } | |
613 } | |
614 return false; | 609 return false; |
615 } | 610 } |
616 | 611 |
617 // The function must have a valid context and not be a builtin. | 612 // The function must have a valid context and not be a builtin. |
618 if (!IsValidNonBuiltinContext(function->unchecked_context())) { | 613 if (!IsValidNonBuiltinContext(function->unchecked_context())) { |
619 return false; | 614 return false; |
620 } | 615 } |
621 | 616 |
622 // We do not (yet) flush code for optimized functions. | 617 // We do not (yet) flush code for optimized functions. |
623 if (function->code() != shared_info->code()) { | 618 if (function->code() != shared_info->code()) { |
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675 if (shared_info->is_toplevel()) { | 670 if (shared_info->is_toplevel()) { |
676 return false; | 671 return false; |
677 } | 672 } |
678 | 673 |
679 // If this is a function initialized with %SetCode then the one-to-one | 674 // If this is a function initialized with %SetCode then the one-to-one |
680 // relation between SharedFunctionInfo and Code is broken. | 675 // relation between SharedFunctionInfo and Code is broken. |
681 if (shared_info->dont_flush()) { | 676 if (shared_info->dont_flush()) { |
682 return false; | 677 return false; |
683 } | 678 } |
684 | 679 |
685 if (FLAG_age_code) { | 680 // Check age of code. If code aging is disabled we never flush. |
686 return shared_info->code()->IsOld(); | 681 if (!FLAG_age_code || !shared_info->code()->IsOld()) { |
687 } else { | 682 return false; |
688 // How many collections newly compiled code object will survive before being | 683 } |
689 // flushed. | |
690 static const int kCodeAgeThreshold = 5; | |
691 | 684 |
692 // Age this shared function info. | 685 return true; |
693 if (shared_info->code_age() < kCodeAgeThreshold) { | |
694 shared_info->set_code_age(shared_info->code_age() + 1); | |
695 return false; | |
696 } | |
697 return true; | |
698 } | |
699 } | 686 } |
700 | 687 |
701 | 688 |
702 template<typename StaticVisitor> | 689 template<typename StaticVisitor> |
703 void StaticMarkingVisitor<StaticVisitor>::VisitSharedFunctionInfoStrongCode( | 690 void StaticMarkingVisitor<StaticVisitor>::VisitSharedFunctionInfoStrongCode( |
704 Heap* heap, HeapObject* object) { | 691 Heap* heap, HeapObject* object) { |
705 StaticVisitor::BeforeVisitingSharedFunctionInfo(object); | 692 StaticVisitor::BeforeVisitingSharedFunctionInfo(object); |
706 Object** start_slot = | 693 Object** start_slot = |
707 HeapObject::RawField(object, | 694 HeapObject::RawField(object, |
708 SharedFunctionInfo::BodyDescriptor::kStartOffset); | 695 SharedFunctionInfo::BodyDescriptor::kStartOffset); |
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830 RelocIterator it(this, mode_mask); | 817 RelocIterator it(this, mode_mask); |
831 for (; !it.done(); it.next()) { | 818 for (; !it.done(); it.next()) { |
832 it.rinfo()->template Visit<StaticVisitor>(heap); | 819 it.rinfo()->template Visit<StaticVisitor>(heap); |
833 } | 820 } |
834 } | 821 } |
835 | 822 |
836 | 823 |
837 } } // namespace v8::internal | 824 } } // namespace v8::internal |
838 | 825 |
839 #endif // V8_OBJECTS_VISITING_INL_H_ | 826 #endif // V8_OBJECTS_VISITING_INL_H_ |
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