mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-26 06:11:37 +00:00
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 -*- */
|
|
/* 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 "jsproxy.h"
|
|
#include "mozilla/dom/DOMJSProxyHandler.h"
|
|
#include "mozilla/HoldDropJSObjects.h"
|
|
#include "nsCycleCollectionTraversalCallback.h"
|
|
#include "nsCycleCollector.h"
|
|
|
|
using namespace mozilla;
|
|
using namespace mozilla::dom;
|
|
|
|
/* static */ void
|
|
nsWrapperCache::HoldJSObjects(void* aScriptObjectHolder,
|
|
nsScriptObjectTracer* aTracer)
|
|
{
|
|
cyclecollector::HoldJSObjectsImpl(aScriptObjectHolder, aTracer);
|
|
}
|
|
|
|
void
|
|
nsWrapperCache::ReleaseWrapper(void* aScriptObjectHolder)
|
|
{
|
|
if (PreservingWrapper()) {
|
|
// PreserveWrapper puts new DOM bindings in the JS holders hash, but they
|
|
// can also be in the DOM expando hash, so we need to try to remove them
|
|
// from both here.
|
|
JSObject* obj = GetWrapperPreserveColor();
|
|
if (IsDOMBinding() && obj && js::IsProxy(obj)) {
|
|
DOMProxyHandler::GetAndClearExpandoObject(obj);
|
|
}
|
|
SetPreservingWrapper(false);
|
|
cyclecollector::DropJSObjectsImpl(aScriptObjectHolder);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
|
|
class DebugWrapperTraversalCallback : public nsCycleCollectionTraversalCallback
|
|
{
|
|
public:
|
|
explicit DebugWrapperTraversalCallback(void* aWrapper)
|
|
: mFound(false)
|
|
, mWrapper(aWrapper)
|
|
{
|
|
mFlags = WANT_ALL_TRACES;
|
|
}
|
|
|
|
NS_IMETHOD_(void) DescribeRefCountedNode(nsrefcnt aRefCount,
|
|
const char* aObjName)
|
|
{
|
|
}
|
|
NS_IMETHOD_(void) DescribeGCedNode(bool aIsMarked,
|
|
const char* aObjName,
|
|
uint64_t aCompartmentAddress)
|
|
{
|
|
}
|
|
|
|
NS_IMETHOD_(void) NoteJSChild(void* aChild)
|
|
{
|
|
if (aChild == mWrapper) {
|
|
mFound = true;
|
|
}
|
|
}
|
|
NS_IMETHOD_(void) NoteXPCOMChild(nsISupports* aChild)
|
|
{
|
|
}
|
|
NS_IMETHOD_(void) NoteNativeChild(void* aChild,
|
|
nsCycleCollectionParticipant* aHelper)
|
|
{
|
|
}
|
|
|
|
NS_IMETHOD_(void) NoteNextEdgeName(const char* aName)
|
|
{
|
|
}
|
|
|
|
bool mFound;
|
|
|
|
private:
|
|
void* mWrapper;
|
|
};
|
|
|
|
static void
|
|
DebugWrapperTraceCallback(void* aP, const char* aName, void* aClosure)
|
|
{
|
|
DebugWrapperTraversalCallback* callback =
|
|
static_cast<DebugWrapperTraversalCallback*>(aClosure);
|
|
callback->NoteJSChild(aP);
|
|
}
|
|
|
|
void
|
|
nsWrapperCache::CheckCCWrapperTraversal(void* aScriptObjectHolder,
|
|
nsScriptObjectTracer* aTracer)
|
|
{
|
|
JSObject* wrapper = GetWrapper();
|
|
if (!wrapper) {
|
|
return;
|
|
}
|
|
|
|
DebugWrapperTraversalCallback callback(wrapper);
|
|
|
|
aTracer->Traverse(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
|