149 lines
4.1 KiB
C++
149 lines
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "js/Class.h"
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#include "js/Proxy.h"
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#include "mozilla/dom/DOMJSProxyHandler.h"
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#include "mozilla/CycleCollectedJSContext.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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#ifdef DEBUG
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/* static */ bool
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nsWrapperCache::HasJSObjectMovedOp(JSObject* aWrapper)
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{
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return js::HasObjectMovedOp(aWrapper);
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}
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#endif
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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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if (mWrapper && !JS::ObjectIsTenured(mWrapper)) {
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CycleCollectedJSContext::Get()->NurseryWrapperPreserved(mWrapper);
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}
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}
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void
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nsWrapperCache::SetWrapperJSObject(JSObject* aWrapper)
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{
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mWrapper = aWrapper;
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UnsetWrapperFlags(kWrapperFlagsMask & ~WRAPPER_IS_NOT_DOM_BINDING);
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if (aWrapper && !JS::ObjectIsTenured(aWrapper)) {
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CycleCollectedJSContext::Get()->NurseryWrapperAdded(this);
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}
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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::ClearExternalRefsForWrapperRelease(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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explicit DebugWrapperTraversalCallback(JSObject* aWrapper)
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: mFound(false)
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, mWrapper(JS::GCCellPtr(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(const JS::GCCellPtr& 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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JS::GCCellPtr mWrapper;
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};
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static void
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DebugWrapperTraceCallback(JS::GCCellPtr aPtr, 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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if (aPtr.is<JSObject>()) {
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callback->NoteJSChild(aPtr);
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}
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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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// The CC traversal machinery cannot trigger GC; however, the analysis cannot
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// see through the COM layer, so we use a suppression to help it.
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JS::AutoSuppressGCAnalysis suppress;
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aTracer->TraverseNativeAndJS(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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