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644bf34f8b
Backed out changeset 033299f27339 (bug 1453011) Backed out changeset 4464997475c1 (bug 1453011) Backed out changeset cae243fb2a3c (bug 1453011) Backed out changeset adf56a83131b (bug 1453011) Backed out changeset 80abe3305b24 (bug 1452981) Backed out changeset 02178545f255 (bug 1452981) Backed out changeset 719f7596c208 (bug 1146316) Backed out changeset 1316c78daeb6 (bug 1146316)
142 lines
3.8 KiB
C++
142 lines
3.8 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 "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 */ 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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CycleCollectedJSRuntime::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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CycleCollectedJSRuntime::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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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) override
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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) override
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{
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}
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NS_IMETHOD_(void) NoteJSChild(const JS::GCCellPtr& aChild) override
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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) override
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{
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}
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NS_IMETHOD_(void) NoteNativeChild(void* aChild,
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nsCycleCollectionParticipant* aHelper) override
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{
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}
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NS_IMETHOD_(void) NoteNextEdgeName(const char* aName) override
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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 = GetWrapperPreserveColor();
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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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