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Issue 23567003: Added a DependentCode field to AllocationSite. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Comment updates Created 7 years, 3 months ago
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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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7830 TRACK_ALLOCATION_SITE, 7830 TRACK_ALLOCATION_SITE,
7831 LAST_ALLOCATION_SITE_MODE = TRACK_ALLOCATION_SITE 7831 LAST_ALLOCATION_SITE_MODE = TRACK_ALLOCATION_SITE
7832 }; 7832 };
7833 7833
7834 7834
7835 class AllocationSite: public Struct { 7835 class AllocationSite: public Struct {
7836 public: 7836 public:
7837 static const uint32_t kMaximumArrayBytesToPretransition = 8 * 1024; 7837 static const uint32_t kMaximumArrayBytesToPretransition = 8 * 1024;
7838 7838
7839 DECL_ACCESSORS(transition_info, Object) 7839 DECL_ACCESSORS(transition_info, Object)
7840 DECL_ACCESSORS(dependent_code, DependentCode)
7840 DECL_ACCESSORS(weak_next, Object) 7841 DECL_ACCESSORS(weak_next, Object)
7841 7842
7842 void Initialize() { 7843 inline void Initialize();
7843 SetElementsKind(GetInitialFastElementsKind());
7844 }
7845 7844
7846 ElementsKind GetElementsKind() { 7845 ElementsKind GetElementsKind() {
7847 ASSERT(!IsLiteralSite()); 7846 ASSERT(!IsLiteralSite());
7848 return static_cast<ElementsKind>(Smi::cast(transition_info())->value()); 7847 return static_cast<ElementsKind>(Smi::cast(transition_info())->value());
7849 } 7848 }
7850 7849
7851 void SetElementsKind(ElementsKind kind) { 7850 void SetElementsKind(ElementsKind kind) {
7852 set_transition_info(Smi::FromInt(static_cast<int>(kind))); 7851 set_transition_info(Smi::FromInt(static_cast<int>(kind)));
7853 } 7852 }
7854 7853
7855 bool IsLiteralSite() { 7854 bool IsLiteralSite() {
7856 // If transition_info is a smi, then it represents an ElementsKind 7855 // If transition_info is a smi, then it represents an ElementsKind
7857 // for a constructed array. Otherwise, it must be a boilerplate 7856 // for a constructed array. Otherwise, it must be a boilerplate
7858 // for an array literal 7857 // for an array literal
7859 return transition_info()->IsJSArray(); 7858 return transition_info()->IsJSArray();
7860 } 7859 }
7861 7860
7862 DECLARE_PRINTER(AllocationSite) 7861 DECLARE_PRINTER(AllocationSite)
7863 DECLARE_VERIFIER(AllocationSite) 7862 DECLARE_VERIFIER(AllocationSite)
7864 7863
7865 static inline AllocationSite* cast(Object* obj); 7864 static inline AllocationSite* cast(Object* obj);
7866 static inline AllocationSiteMode GetMode( 7865 static inline AllocationSiteMode GetMode(
7867 ElementsKind boilerplate_elements_kind); 7866 ElementsKind boilerplate_elements_kind);
7868 static inline AllocationSiteMode GetMode(ElementsKind from, ElementsKind to); 7867 static inline AllocationSiteMode GetMode(ElementsKind from, ElementsKind to);
7869 static inline bool CanTrack(InstanceType type); 7868 static inline bool CanTrack(InstanceType type);
7870 7869
7871 static const int kTransitionInfoOffset = HeapObject::kHeaderSize; 7870 static const int kTransitionInfoOffset = HeapObject::kHeaderSize;
7872 static const int kWeakNextOffset = kTransitionInfoOffset + kPointerSize; 7871 static const int kDependentCodeOffset = kTransitionInfoOffset + kPointerSize;
7872 static const int kWeakNextOffset = kDependentCodeOffset + kPointerSize;
7873 static const int kSize = kWeakNextOffset + kPointerSize; 7873 static const int kSize = kWeakNextOffset + kPointerSize;
7874 7874
7875 typedef FixedBodyDescriptor<HeapObject::kHeaderSize, 7875 typedef FixedBodyDescriptor<HeapObject::kHeaderSize,
7876 kTransitionInfoOffset + kPointerSize, 7876 kDependentCodeOffset + kPointerSize,
7877 kSize> BodyDescriptor; 7877 kSize> BodyDescriptor;
7878 7878
7879 private: 7879 private:
7880 DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationSite); 7880 DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationSite);
7881 }; 7881 };
7882 7882
7883 7883
7884 class AllocationMemento: public Struct { 7884 class AllocationMemento: public Struct {
7885 public: 7885 public:
7886 static const int kAllocationSiteOffset = HeapObject::kHeaderSize; 7886 static const int kAllocationSiteOffset = HeapObject::kHeaderSize;
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10242 } else { 10242 } else {
10243 value &= ~(1 << bit_position); 10243 value &= ~(1 << bit_position);
10244 } 10244 }
10245 return value; 10245 return value;
10246 } 10246 }
10247 }; 10247 };
10248 10248
10249 } } // namespace v8::internal 10249 } } // namespace v8::internal
10250 10250
10251 #endif // V8_OBJECTS_H_ 10251 #endif // V8_OBJECTS_H_
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