зеркало из https://github.com/mozilla/gecko-dev.git
127 строки
4.1 KiB
C++
127 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "nsWrapperCacheInlines.h"
|
|
|
|
#include "js/Class.h"
|
|
#include "js/Proxy.h"
|
|
#include "mozilla/CycleCollectedJSRuntime.h"
|
|
#include "mozilla/HoldDropJSObjects.h"
|
|
#include "nsCycleCollectionTraversalCallback.h"
|
|
#include "nsCycleCollector.h"
|
|
|
|
using namespace mozilla;
|
|
using namespace mozilla::dom;
|
|
|
|
#ifdef DEBUG
|
|
/* static */
|
|
bool nsWrapperCache::HasJSObjectMovedOp(JSObject* aWrapper) {
|
|
return js::HasObjectMovedOp(aWrapper);
|
|
}
|
|
#endif
|
|
|
|
void nsWrapperCache::HoldJSObjects(void* aScriptObjectHolder,
|
|
nsScriptObjectTracer* aTracer) {
|
|
cyclecollector::HoldJSObjectsImpl(aScriptObjectHolder, aTracer);
|
|
if (mWrapper && !JS::ObjectIsTenured(mWrapper)) {
|
|
CycleCollectedJSRuntime::Get()->NurseryWrapperPreserved(mWrapper);
|
|
}
|
|
}
|
|
|
|
void nsWrapperCache::SetWrapperJSObject(JSObject* aWrapper) {
|
|
mWrapper = aWrapper;
|
|
UnsetWrapperFlags(kWrapperFlagsMask);
|
|
|
|
if (aWrapper && !JS::ObjectIsTenured(aWrapper)) {
|
|
CycleCollectedJSRuntime::Get()->NurseryWrapperAdded(this);
|
|
}
|
|
|
|
// Never collect the wrapper object while recording or replaying, to avoid
|
|
// non-deterministic behaviors if the cache is emptied and then refilled at
|
|
// a different point when replaying.
|
|
recordreplay::HoldJSObject(aWrapper);
|
|
}
|
|
|
|
void nsWrapperCache::ReleaseWrapper(void* aScriptObjectHolder) {
|
|
// If the behavior here changes in a substantive way, you may need
|
|
// to update css::Rule::UnlinkDeclarationWrapper as well.
|
|
if (PreservingWrapper()) {
|
|
SetPreservingWrapper(false);
|
|
cyclecollector::DropJSObjectsImpl(aScriptObjectHolder);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
|
|
class DebugWrapperTraversalCallback
|
|
: public nsCycleCollectionTraversalCallback {
|
|
public:
|
|
explicit DebugWrapperTraversalCallback(JSObject* aWrapper)
|
|
: mFound(false), mWrapper(JS::GCCellPtr(aWrapper)) {
|
|
mFlags = WANT_ALL_TRACES;
|
|
}
|
|
|
|
NS_IMETHOD_(void)
|
|
DescribeRefCountedNode(nsrefcnt aRefCount, const char* aObjName) override {}
|
|
NS_IMETHOD_(void)
|
|
DescribeGCedNode(bool aIsMarked, const char* aObjName,
|
|
uint64_t aCompartmentAddress) override {}
|
|
|
|
NS_IMETHOD_(void) NoteJSChild(const JS::GCCellPtr& aChild) override {
|
|
if (aChild == mWrapper) {
|
|
mFound = true;
|
|
}
|
|
}
|
|
NS_IMETHOD_(void) NoteXPCOMChild(nsISupports* aChild) override {}
|
|
NS_IMETHOD_(void)
|
|
NoteNativeChild(void* aChild,
|
|
nsCycleCollectionParticipant* aHelper) override {}
|
|
|
|
NS_IMETHOD_(void) NoteNextEdgeName(const char* aName) override {}
|
|
|
|
bool mFound;
|
|
|
|
private:
|
|
JS::GCCellPtr mWrapper;
|
|
};
|
|
|
|
static void DebugWrapperTraceCallback(JS::GCCellPtr aPtr, const char* aName,
|
|
void* aClosure) {
|
|
DebugWrapperTraversalCallback* callback =
|
|
static_cast<DebugWrapperTraversalCallback*>(aClosure);
|
|
if (aPtr.is<JSObject>()) {
|
|
callback->NoteJSChild(aPtr);
|
|
}
|
|
}
|
|
|
|
void nsWrapperCache::CheckCCWrapperTraversal(void* aScriptObjectHolder,
|
|
nsScriptObjectTracer* aTracer) {
|
|
JSObject* wrapper = GetWrapperPreserveColor();
|
|
if (!wrapper) {
|
|
return;
|
|
}
|
|
|
|
DebugWrapperTraversalCallback callback(wrapper);
|
|
|
|
// The CC traversal machinery cannot trigger GC; however, the analysis cannot
|
|
// see through the COM layer, so we use a suppression to help it.
|
|
JS::AutoSuppressGCAnalysis suppress;
|
|
|
|
aTracer->TraverseNativeAndJS(aScriptObjectHolder, callback);
|
|
MOZ_ASSERT(callback.mFound,
|
|
"Cycle collection participant didn't traverse to preserved "
|
|
"wrapper! This will probably crash.");
|
|
|
|
callback.mFound = false;
|
|
aTracer->Trace(aScriptObjectHolder,
|
|
TraceCallbackFunc(DebugWrapperTraceCallback), &callback);
|
|
MOZ_ASSERT(callback.mFound,
|
|
"Cycle collection participant didn't trace preserved wrapper! "
|
|
"This will probably crash.");
|
|
}
|
|
|
|
#endif // DEBUG
|