36b0901dec
CLOSED TREE
Backed out changeset c23b8418e6be (bug 1060987)
Backed out changeset a8cddc6bdffc (bug 1061060)
Backed out changeset b5af5cbdac3f (bug 1060982)
Backed out changeset 4912d451011a (bug 1060930)
Backed out changeset bdacbf453238 (bug 1061058)
Backed out changeset da6c71a8f5ae (bug 1060987)
120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsWrapperCacheInlines.h"
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#include "jsproxy.h"
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#include "mozilla/dom/DOMJSProxyHandler.h"
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#include "mozilla/HoldDropJSObjects.h"
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#include "nsCycleCollectionTraversalCallback.h"
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#include "nsCycleCollector.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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/* static */ void
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nsWrapperCache::HoldJSObjects(void* aScriptObjectHolder,
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nsScriptObjectTracer* aTracer)
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{
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cyclecollector::HoldJSObjectsImpl(aScriptObjectHolder, aTracer);
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}
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void
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nsWrapperCache::ReleaseWrapper(void* aScriptObjectHolder)
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{
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if (PreservingWrapper()) {
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// PreserveWrapper puts new DOM bindings in the JS holders hash, but they
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// can also be in the DOM expando hash, so we need to try to remove them
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// from both here.
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JSObject* obj = GetWrapperPreserveColor();
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if (IsDOMBinding() && obj && js::IsProxy(obj)) {
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DOMProxyHandler::GetAndClearExpandoObject(obj);
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}
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SetPreservingWrapper(false);
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cyclecollector::DropJSObjectsImpl(aScriptObjectHolder);
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}
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}
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#ifdef DEBUG
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class DebugWrapperTraversalCallback : public nsCycleCollectionTraversalCallback
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{
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public:
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DebugWrapperTraversalCallback(void* aWrapper)
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: mFound(false)
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, mWrapper(aWrapper)
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{
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mFlags = WANT_ALL_TRACES;
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}
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NS_IMETHOD_(void) DescribeRefCountedNode(nsrefcnt aRefCount,
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const char* aObjName)
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{
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}
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NS_IMETHOD_(void) DescribeGCedNode(bool aIsMarked,
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const char* aObjName,
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uint64_t aCompartmentAddress)
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{
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}
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NS_IMETHOD_(void) NoteJSChild(void* aChild)
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{
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if (aChild == mWrapper) {
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mFound = true;
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}
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}
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NS_IMETHOD_(void) NoteXPCOMChild(nsISupports* aChild)
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{
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}
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NS_IMETHOD_(void) NoteNativeChild(void* aChild,
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nsCycleCollectionParticipant* aHelper)
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{
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}
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NS_IMETHOD_(void) NoteNextEdgeName(const char* aName)
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{
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}
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bool mFound;
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private:
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void* mWrapper;
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};
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static void
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DebugWrapperTraceCallback(void* aP, const char* aName, void* aClosure)
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{
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DebugWrapperTraversalCallback* callback =
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static_cast<DebugWrapperTraversalCallback*>(aClosure);
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callback->NoteJSChild(aP);
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}
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void
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nsWrapperCache::CheckCCWrapperTraversal(void* aScriptObjectHolder,
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nsScriptObjectTracer* aTracer)
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{
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JSObject* wrapper = GetWrapper();
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if (!wrapper) {
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return;
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}
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DebugWrapperTraversalCallback callback(wrapper);
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aTracer->Traverse(aScriptObjectHolder, callback);
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MOZ_ASSERT(callback.mFound,
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"Cycle collection participant didn't traverse to preserved "
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"wrapper! This will probably crash.");
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callback.mFound = false;
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aTracer->Trace(aScriptObjectHolder,
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TraceCallbackFunc(DebugWrapperTraceCallback), &callback);
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MOZ_ASSERT(callback.mFound,
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"Cycle collection participant didn't trace preserved wrapper! "
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"This will probably crash.");
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}
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#endif // DEBUG
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