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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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7467 | 7467 |
7468 enum AllocationSiteMode { | 7468 enum AllocationSiteMode { |
7469 DONT_TRACK_ALLOCATION_SITE, | 7469 DONT_TRACK_ALLOCATION_SITE, |
7470 TRACK_ALLOCATION_SITE, | 7470 TRACK_ALLOCATION_SITE, |
7471 LAST_ALLOCATION_SITE_MODE = TRACK_ALLOCATION_SITE | 7471 LAST_ALLOCATION_SITE_MODE = TRACK_ALLOCATION_SITE |
7472 }; | 7472 }; |
7473 | 7473 |
7474 | 7474 |
7475 class AllocationSite: public Struct { | 7475 class AllocationSite: public Struct { |
7476 public: | 7476 public: |
7477 static const int kTransitionInfoOffset = HeapObject::kHeaderSize; | |
7478 static const int kSize = kTransitionInfoOffset + kPointerSize; | |
7479 static const uint32_t kMaximumArrayBytesToPretransition = 8 * 1024; | 7477 static const uint32_t kMaximumArrayBytesToPretransition = 8 * 1024; |
7480 | 7478 |
7481 DECL_ACCESSORS(transition_info, Object) | 7479 DECL_ACCESSORS(transition_info, Object) |
| 7480 DECL_ACCESSORS(weak_next, Object) |
7482 | 7481 |
7483 void Initialize() { | 7482 void Initialize() { |
7484 SetElementsKind(GetInitialFastElementsKind()); | 7483 SetElementsKind(GetInitialFastElementsKind()); |
7485 } | 7484 } |
7486 | 7485 |
7487 ElementsKind GetElementsKind() { | 7486 ElementsKind GetElementsKind() { |
7488 ASSERT(!IsLiteralSite()); | 7487 ASSERT(!IsLiteralSite()); |
7489 return static_cast<ElementsKind>(Smi::cast(transition_info())->value()); | 7488 return static_cast<ElementsKind>(Smi::cast(transition_info())->value()); |
7490 } | 7489 } |
7491 | 7490 |
7492 void SetElementsKind(ElementsKind kind) { | 7491 void SetElementsKind(ElementsKind kind) { |
7493 set_transition_info(Smi::FromInt(static_cast<int>(kind))); | 7492 set_transition_info(Smi::FromInt(static_cast<int>(kind))); |
7494 } | 7493 } |
7495 | 7494 |
7496 bool IsLiteralSite() { | 7495 bool IsLiteralSite() { |
7497 // If transition_info is a smi, then it represents an ElementsKind | 7496 // If transition_info is a smi, then it represents an ElementsKind |
7498 // for a constructed array. Otherwise, it must be a boilerplate | 7497 // for a constructed array. Otherwise, it must be a boilerplate |
7499 // for an array literal | 7498 // for an array literal |
7500 return transition_info()->IsJSArray(); | 7499 return transition_info()->IsJSArray(); |
7501 } | 7500 } |
7502 | 7501 |
7503 DECLARE_PRINTER(AllocationSite) | 7502 DECLARE_PRINTER(AllocationSite) |
7504 DECLARE_VERIFIER(AllocationSite) | 7503 DECLARE_VERIFIER(AllocationSite) |
7505 | 7504 |
7506 static inline AllocationSite* cast(Object* obj); | 7505 static inline AllocationSite* cast(Object* obj); |
7507 static inline AllocationSiteMode GetMode( | 7506 static inline AllocationSiteMode GetMode( |
7508 ElementsKind boilerplate_elements_kind); | 7507 ElementsKind boilerplate_elements_kind); |
7509 static inline AllocationSiteMode GetMode(ElementsKind from, ElementsKind to); | 7508 static inline AllocationSiteMode GetMode(ElementsKind from, ElementsKind to); |
7510 | 7509 |
| 7510 static const int kTransitionInfoOffset = HeapObject::kHeaderSize; |
| 7511 static const int kWeakNextOffset = kTransitionInfoOffset + kPointerSize; |
| 7512 static const int kSize = kWeakNextOffset + kPointerSize; |
| 7513 |
| 7514 typedef FixedBodyDescriptor<HeapObject::kHeaderSize, |
| 7515 kTransitionInfoOffset + kPointerSize, |
| 7516 kSize> BodyDescriptor; |
| 7517 |
7511 private: | 7518 private: |
7512 DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationSite); | 7519 DISALLOW_IMPLICIT_CONSTRUCTORS(AllocationSite); |
7513 }; | 7520 }; |
7514 | 7521 |
7515 | 7522 |
7516 class AllocationSiteInfo: public Struct { | 7523 class AllocationSiteInfo: public Struct { |
7517 public: | 7524 public: |
7518 static const int kAllocationSiteOffset = HeapObject::kHeaderSize; | 7525 static const int kAllocationSiteOffset = HeapObject::kHeaderSize; |
7519 static const int kSize = kAllocationSiteOffset + kPointerSize; | 7526 static const int kSize = kAllocationSiteOffset + kPointerSize; |
7520 | 7527 |
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9819 } else { | 9826 } else { |
9820 value &= ~(1 << bit_position); | 9827 value &= ~(1 << bit_position); |
9821 } | 9828 } |
9822 return value; | 9829 return value; |
9823 } | 9830 } |
9824 }; | 9831 }; |
9825 | 9832 |
9826 } } // namespace v8::internal | 9833 } } // namespace v8::internal |
9827 | 9834 |
9828 #endif // V8_OBJECTS_H_ | 9835 #endif // V8_OBJECTS_H_ |
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