The Tor Browser / file comparison
comparison: dom/base/nsWrapperCache.cpp
dom/base/nsWrapperCache.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:f48327c7799d |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include "nsWrapperCacheInlines.h" | |
| 8 | |
| 9 #include "jsproxy.h" | |
| 10 #include "mozilla/dom/DOMJSProxyHandler.h" | |
| 11 #include "mozilla/HoldDropJSObjects.h" | |
| 12 #include "nsCycleCollectionTraversalCallback.h" | |
| 13 #include "nsCycleCollector.h" | |
| 14 | |
| 15 using namespace mozilla; | |
| 16 using namespace mozilla::dom; | |
| 17 | |
| 18 /* static */ void | |
| 19 nsWrapperCache::HoldJSObjects(void* aScriptObjectHolder, | |
| 20 nsScriptObjectTracer* aTracer) | |
| 21 { | |
| 22 cyclecollector::HoldJSObjectsImpl(aScriptObjectHolder, aTracer); | |
| 23 } | |
| 24 | |
| 25 void | |
| 26 nsWrapperCache::ReleaseWrapper(void* aScriptObjectHolder) | |
| 27 { | |
| 28 if (PreservingWrapper()) { | |
| 29 // PreserveWrapper puts new DOM bindings in the JS holders hash, but they | |
| 30 // can also be in the DOM expando hash, so we need to try to remove them | |
| 31 // from both here. | |
| 32 JSObject* obj = GetWrapperPreserveColor(); | |
| 33 if (IsDOMBinding() && obj && js::IsProxy(obj)) { | |
| 34 DOMProxyHandler::GetAndClearExpandoObject(obj); | |
| 35 } | |
| 36 SetPreservingWrapper(false); | |
| 37 cyclecollector::DropJSObjectsImpl(aScriptObjectHolder); | |
| 38 } | |
| 39 } | |
| 40 | |
| 41 #ifdef DEBUG | |
| 42 | |
| 43 class DebugWrapperTraversalCallback : public nsCycleCollectionTraversalCallback | |
| 44 { | |
| 45 public: | |
| 46 DebugWrapperTraversalCallback(void* aWrapper) | |
| 47 : mFound(false) | |
| 48 , mWrapper(aWrapper) | |
| 49 { | |
| 50 mFlags = WANT_ALL_TRACES; | |
| 51 } | |
| 52 | |
| 53 NS_IMETHOD_(void) DescribeRefCountedNode(nsrefcnt aRefCount, | |
| 54 const char* aObjName) | |
| 55 { | |
| 56 } | |
| 57 NS_IMETHOD_(void) DescribeGCedNode(bool aIsMarked, | |
| 58 const char* aObjName, | |
| 59 uint64_t aCompartmentAddress) | |
| 60 { | |
| 61 } | |
| 62 | |
| 63 NS_IMETHOD_(void) NoteJSChild(void* aChild) | |
| 64 { | |
| 65 if (aChild == mWrapper) { | |
| 66 mFound = true; | |
| 67 } | |
| 68 } | |
| 69 NS_IMETHOD_(void) NoteXPCOMChild(nsISupports* aChild) | |
| 70 { | |
| 71 } | |
| 72 NS_IMETHOD_(void) NoteNativeChild(void* aChild, | |
| 73 nsCycleCollectionParticipant* aHelper) | |
| 74 { | |
| 75 } | |
| 76 | |
| 77 NS_IMETHOD_(void) NoteNextEdgeName(const char* aName) | |
| 78 { | |
| 79 } | |
| 80 | |
| 81 bool mFound; | |
| 82 | |
| 83 private: | |
| 84 void* mWrapper; | |
| 85 }; | |
| 86 | |
| 87 static void | |
| 88 DebugWrapperTraceCallback(void* aP, const char* aName, void* aClosure) | |
| 89 { | |
| 90 DebugWrapperTraversalCallback* callback = | |
| 91 static_cast<DebugWrapperTraversalCallback*>(aClosure); | |
| 92 callback->NoteJSChild(aP); | |
| 93 } | |
| 94 | |
| 95 void | |
| 96 nsWrapperCache::CheckCCWrapperTraversal(void* aScriptObjectHolder, | |
| 97 nsScriptObjectTracer* aTracer) | |
| 98 { | |
| 99 JSObject* wrapper = GetWrapper(); | |
| 100 if (!wrapper) { | |
| 101 return; | |
| 102 } | |
| 103 | |
| 104 DebugWrapperTraversalCallback callback(wrapper); | |
| 105 | |
| 106 aTracer->Traverse(aScriptObjectHolder, callback); | |
| 107 MOZ_ASSERT(callback.mFound, | |
| 108 "Cycle collection participant didn't traverse to preserved " | |
| 109 "wrapper! This will probably crash."); | |
| 110 | |
| 111 callback.mFound = false; | |
| 112 aTracer->Trace(aScriptObjectHolder, | |
| 113 TraceCallbackFunc(DebugWrapperTraceCallback), &callback); | |
| 114 MOZ_ASSERT(callback.mFound, | |
| 115 "Cycle collection participant didn't trace preserved wrapper! " | |
| 116 "This will probably crash."); | |
| 117 } | |
| 118 | |
| 119 #endif // DEBUG |
