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| 1 /* | 1 /* |
| 2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
| 6 * met: | 6 * met: |
| 7 * | 7 * |
| 8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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| 859 // iteration). | 859 // iteration). |
| 860 static void pushPostMarkingCallback(void*, TraceCallback); | 860 static void pushPostMarkingCallback(void*, TraceCallback); |
| 861 | 861 |
| 862 // Add a weak pointer callback to the weak callback work list. General | 862 // Add a weak pointer callback to the weak callback work list. General |
| 863 // object pointer callbacks are added to a thread local weak callback work | 863 // object pointer callbacks are added to a thread local weak callback work |
| 864 // list and the callback is called on the thread that owns the object, with | 864 // list and the callback is called on the thread that owns the object, with |
| 865 // the closure pointer as an argument. Most of the time, the closure and | 865 // the closure pointer as an argument. Most of the time, the closure and |
| 866 // the containerObject can be the same thing, but the containerObject is | 866 // the containerObject can be the same thing, but the containerObject is |
| 867 // constrained to be on the heap, since the heap is used to identify the | 867 // constrained to be on the heap, since the heap is used to identify the |
| 868 // correct thread. | 868 // correct thread. |
| 869 static void pushWeakPointerCallback(void* closure, void* containerObject, We
akPointerCallback); | 869 static void pushThreadLocalWeakCallback(void* closure, void* containerObject
, WeakCallback); |
| 870 | 870 |
| 871 // Similar to the more general pushWeakPointerCallback, but cell | 871 // Similar to the more general pushThreadLocalWeakCallback, but cell |
| 872 // pointer callbacks are added to a static callback work list and the weak | 872 // pointer callbacks are added to a static callback work list and the weak |
| 873 // callback is performed on the thread performing garbage collection. This | 873 // callback is performed on the thread performing garbage collection. This |
| 874 // is OK because cells are just cleared and no deallocation can happen. | 874 // is OK because cells are just cleared and no deallocation can happen. |
| 875 static void pushWeakCellPointerCallback(void** cell, WeakPointerCallback); | 875 static void pushGlobalWeakCallback(void** cell, WeakCallback); |
| 876 | 876 |
| 877 // Pop the top of a marking stack and call the callback with the visitor | 877 // Pop the top of a marking stack and call the callback with the visitor |
| 878 // and the object. Returns false when there is nothing more to do. | 878 // and the object. Returns false when there is nothing more to do. |
| 879 static bool popAndInvokeTraceCallback(Visitor*); | 879 static bool popAndInvokeTraceCallback(Visitor*); |
| 880 | 880 |
| 881 // Remove an item from the post-marking callback stack and call | 881 // Remove an item from the post-marking callback stack and call |
| 882 // the callback with the visitor and the object pointer. Returns | 882 // the callback with the visitor and the object pointer. Returns |
| 883 // false when there is nothing more to do. | 883 // false when there is nothing more to do. |
| 884 static bool popAndInvokePostMarkingCallback(Visitor*); | 884 static bool popAndInvokePostMarkingCallback(Visitor*); |
| 885 | 885 |
| 886 // Remove an item from the weak callback work list and call the callback | 886 // Remove an item from the weak callback work list and call the callback |
| 887 // with the visitor and the closure pointer. Returns false when there is | 887 // with the visitor and the closure pointer. Returns false when there is |
| 888 // nothing more to do. | 888 // nothing more to do. |
| 889 static bool popAndInvokeWeakPointerCallback(Visitor*); | 889 static bool popAndInvokeGlobalWeakCallback(Visitor*); |
| 890 | 890 |
| 891 // Register an ephemeron table for fixed-point iteration. | 891 // Register an ephemeron table for fixed-point iteration. |
| 892 static void registerWeakTable(void* containerObject, EphemeronCallback, Ephe
meronCallback); | 892 static void registerWeakTable(void* containerObject, EphemeronCallback, Ephe
meronCallback); |
| 893 #if ENABLE(ASSERT) | 893 #if ENABLE(ASSERT) |
| 894 static bool weakTableRegistered(const void*); | 894 static bool weakTableRegistered(const void*); |
| 895 #endif | 895 #endif |
| 896 | 896 |
| 897 static inline size_t allocationSizeFromSize(size_t size) | 897 static inline size_t allocationSizeFromSize(size_t size) |
| 898 { | 898 { |
| 899 // Check the size before computing the actual allocation size. The | 899 // Check the size before computing the actual allocation size. The |
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| 1014 RegionTree* m_left; | 1014 RegionTree* m_left; |
| 1015 RegionTree* m_right; | 1015 RegionTree* m_right; |
| 1016 }; | 1016 }; |
| 1017 | 1017 |
| 1018 // Reset counters that track live and allocated-since-last-GC sizes. | 1018 // Reset counters that track live and allocated-since-last-GC sizes. |
| 1019 static void resetHeapCounters(); | 1019 static void resetHeapCounters(); |
| 1020 | 1020 |
| 1021 static Visitor* s_markingVisitor; | 1021 static Visitor* s_markingVisitor; |
| 1022 static CallbackStack* s_markingStack; | 1022 static CallbackStack* s_markingStack; |
| 1023 static CallbackStack* s_postMarkingCallbackStack; | 1023 static CallbackStack* s_postMarkingCallbackStack; |
| 1024 static CallbackStack* s_weakCallbackStack; | 1024 static CallbackStack* s_globalWeakCallbackStack; |
| 1025 static CallbackStack* s_ephemeronStack; | 1025 static CallbackStack* s_ephemeronStack; |
| 1026 static HeapDoesNotContainCache* s_heapDoesNotContainCache; | 1026 static HeapDoesNotContainCache* s_heapDoesNotContainCache; |
| 1027 static bool s_shutdownCalled; | 1027 static bool s_shutdownCalled; |
| 1028 static bool s_lastGCWasConservative; | 1028 static bool s_lastGCWasConservative; |
| 1029 static FreePagePool* s_freePagePool; | 1029 static FreePagePool* s_freePagePool; |
| 1030 static OrphanedPagePool* s_orphanedPagePool; | 1030 static OrphanedPagePool* s_orphanedPagePool; |
| 1031 static RegionTree* s_regionTree; | 1031 static RegionTree* s_regionTree; |
| 1032 static size_t s_allocatedSpace; | 1032 static size_t s_allocatedSpace; |
| 1033 static size_t s_allocatedObjectSize; | 1033 static size_t s_allocatedObjectSize; |
| 1034 static size_t s_markedObjectSize; | 1034 static size_t s_markedObjectSize; |
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| 1273 size_t copySize = previousHeader->payloadSize(); | 1273 size_t copySize = previousHeader->payloadSize(); |
| 1274 if (copySize > size) | 1274 if (copySize > size) |
| 1275 copySize = size; | 1275 copySize = size; |
| 1276 memcpy(address, previous, copySize); | 1276 memcpy(address, previous, copySize); |
| 1277 return address; | 1277 return address; |
| 1278 } | 1278 } |
| 1279 | 1279 |
| 1280 } // namespace blink | 1280 } // namespace blink |
| 1281 | 1281 |
| 1282 #endif // Heap_h | 1282 #endif // Heap_h |
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