зеркало из https://github.com/mozilla/gecko-dev.git
137 строки
4.4 KiB
C++
137 строки
4.4 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 "jsfriendapi.h"
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#include "js/Class.h"
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#include "js/Proxy.h"
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#include "mozilla/CycleCollectedJSRuntime.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 */
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bool nsWrapperCache::HasJSObjectMovedOp(JSObject* aWrapper) {
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return js::HasObjectMovedOp(aWrapper);
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}
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#endif
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void nsWrapperCache::HoldJSObjects(void* aScriptObjectHolder,
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nsScriptObjectTracer* aTracer,
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JS::Zone* aWrapperZone) {
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cyclecollector::HoldJSObjectsImpl(aScriptObjectHolder, aTracer, aWrapperZone);
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if (mWrapper && !JS::ObjectIsTenured(mWrapper)) {
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CycleCollectedJSRuntime::Get()->NurseryWrapperPreserved(mWrapper);
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}
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}
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void nsWrapperCache::SetWrapperJSObject(JSObject* aWrapper) {
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mWrapper = aWrapper;
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UnsetWrapperFlags(kWrapperFlagsMask);
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if (aWrapper && !JS::ObjectIsTenured(aWrapper)) {
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CycleCollectedJSRuntime::Get()->NurseryWrapperAdded(this);
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}
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}
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void nsWrapperCache::ReleaseWrapper(void* aScriptObjectHolder) {
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// If the behavior here changes in a substantive way, you may need
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// to update css::Rule::UnlinkDeclarationWrapper as well.
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if (PreservingWrapper()) {
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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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void nsWrapperCache::AssertUpdatedWrapperZone(const JSObject* aNewObject,
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const JSObject* aOldObject) {
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MOZ_ASSERT(js::GetObjectZoneFromAnyThread(aNewObject) ==
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js::GetObjectZoneFromAnyThread(aOldObject));
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}
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class DebugWrapperTraversalCallback
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: public nsCycleCollectionTraversalCallback {
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public:
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explicit DebugWrapperTraversalCallback(JSObject* aWrapper)
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: mFound(false), mWrapper(JS::GCCellPtr(aWrapper)) {
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mFlags = WANT_ALL_TRACES;
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}
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NS_IMETHOD_(void)
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DescribeRefCountedNode(nsrefcnt aRefCount, const char* aObjName) override {}
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NS_IMETHOD_(void)
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DescribeGCedNode(bool aIsMarked, const char* aObjName,
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uint64_t aCompartmentAddress) override {}
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NS_IMETHOD_(void) NoteJSChild(const JS::GCCellPtr& aChild) override {
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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) override {}
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NS_IMETHOD_(void)
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NoteNativeChild(void* aChild,
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nsCycleCollectionParticipant* aHelper) override {}
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NS_IMETHOD_(void) NoteNextEdgeName(const char* aName) override {}
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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 DebugWrapperTraceCallback(JS::GCCellPtr aPtr, const char* aName,
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void* aClosure) {
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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 nsWrapperCache::CheckCCWrapperTraversal(void* aScriptObjectHolder,
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nsScriptObjectTracer* aTracer) {
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JSObject* wrapper = GetWrapperPreserveColor();
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if (!wrapper) {
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return;
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}
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// Temporarily make this a preserving wrapper so that TraceWrapper() traces
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// it.
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bool wasPreservingWrapper = PreservingWrapper();
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SetPreservingWrapper(true);
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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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SetPreservingWrapper(wasPreservingWrapper);
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}
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#endif // DEBUG
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