mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
e09a1c07c5
I took the opportunity to move away from the NonNull<nsAString> hack we had for string arguments, since just passing in a FakeDependentString works fine and callees are now less likely to declare their arg as being of that type. In the process of doing that, I ran into what looks like a substantive bug in the "owning union with string default value" case: We were doing mValue.mString.Value() without ever having constructed mValue.mString!
272 lines
8.0 KiB
C++
272 lines
8.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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 "nsJSEventListener.h"
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#include "nsJSUtils.h"
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#include "nsString.h"
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#include "nsIServiceManager.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsIScriptContext.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsIXPConnect.h"
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#include "nsIMutableArray.h"
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#include "nsVariant.h"
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#include "nsIDOMBeforeUnloadEvent.h"
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#include "nsGkAtoms.h"
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#include "xpcpublic.h"
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#include "nsJSEnvironment.h"
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#include "nsDOMJSUtils.h"
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#include "mozilla/ContentEvents.h"
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#include "mozilla/Likely.h"
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#include "mozilla/dom/UnionTypes.h"
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#include "nsDOMEvent.h"
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#ifdef DEBUG
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#include "nspr.h" // PR_fprintf
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class EventListenerCounter
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{
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public:
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~EventListenerCounter() {
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}
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};
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static EventListenerCounter sEventListenerCounter;
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#endif
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using namespace mozilla;
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using namespace mozilla::dom;
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/*
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* nsJSEventListener implementation
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*/
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nsJSEventListener::nsJSEventListener(JSObject* aScopeObject,
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nsISupports *aTarget,
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nsIAtom* aType,
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const nsEventHandler& aHandler)
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: nsIJSEventListener(aScopeObject, aTarget, aType, aHandler)
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{
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if (mScopeObject) {
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mozilla::HoldJSObjects(this);
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}
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}
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nsJSEventListener::~nsJSEventListener()
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{
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if (mScopeObject) {
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mScopeObject = nullptr;
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mozilla::DropJSObjects(this);
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}
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}
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/* virtual */
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void
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nsJSEventListener::UpdateScopeObject(JS::Handle<JSObject*> aScopeObject)
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{
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if (mScopeObject && !aScopeObject) {
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mScopeObject = nullptr;
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mozilla::DropJSObjects(this);
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} else if (aScopeObject && !mScopeObject) {
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mozilla::HoldJSObjects(this);
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}
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mScopeObject = aScopeObject;
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}
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NS_IMPL_CYCLE_COLLECTION_CLASS(nsJSEventListener)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsJSEventListener)
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if (tmp->mScopeObject) {
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tmp->mScopeObject = nullptr;
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mozilla::DropJSObjects(tmp);
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}
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tmp->mHandler.ForgetHandler();
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(nsJSEventListener)
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if (MOZ_UNLIKELY(cb.WantDebugInfo()) && tmp->mEventName) {
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nsAutoCString name;
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name.AppendLiteral("nsJSEventListener handlerName=");
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name.Append(
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NS_ConvertUTF16toUTF8(nsDependentAtomString(tmp->mEventName)).get());
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cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name.get());
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} else {
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NS_IMPL_CYCLE_COLLECTION_DESCRIBE(nsJSEventListener, tmp->mRefCnt.get())
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mHandler.Ptr())
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsJSEventListener)
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NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mScopeObject)
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NS_IMPL_CYCLE_COLLECTION_TRACE_END
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NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsJSEventListener)
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if (tmp->IsBlackForCC()) {
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return true;
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}
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// If we have a target, it is the one which has tmp as onfoo handler.
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if (tmp->mTarget) {
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nsXPCOMCycleCollectionParticipant* cp = nullptr;
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CallQueryInterface(tmp->mTarget, &cp);
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nsISupports* canonical = nullptr;
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tmp->mTarget->QueryInterface(NS_GET_IID(nsCycleCollectionISupports),
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reinterpret_cast<void**>(&canonical));
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// Usually CanSkip ends up unmarking the event listeners of mTarget,
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// so tmp may become black.
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if (cp && canonical && cp->CanSkip(canonical, true)) {
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return tmp->IsBlackForCC();
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}
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}
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NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
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NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsJSEventListener)
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return tmp->IsBlackForCC();
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NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
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NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsJSEventListener)
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return tmp->IsBlackForCC();
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NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsJSEventListener)
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NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
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NS_INTERFACE_MAP_ENTRY(nsIJSEventListener)
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NS_INTERFACE_MAP_ENTRY(nsISupports)
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NS_INTERFACE_MAP_END
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NS_IMPL_CYCLE_COLLECTING_ADDREF(nsJSEventListener)
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NS_IMPL_CYCLE_COLLECTING_RELEASE(nsJSEventListener)
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bool
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nsJSEventListener::IsBlackForCC()
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{
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// We can claim to be black if all the things we reference are
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// effectively black already.
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if ((!mScopeObject || !xpc_IsGrayGCThing(mScopeObject)) &&
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(!mHandler.HasEventHandler() ||
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!mHandler.Ptr()->HasGrayCallable())) {
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return true;
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}
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return false;
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}
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nsresult
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nsJSEventListener::HandleEvent(nsIDOMEvent* aEvent)
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{
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nsCOMPtr<EventTarget> target = do_QueryInterface(mTarget);
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if (!target || !mHandler.HasEventHandler())
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return NS_ERROR_FAILURE;
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if (mHandler.Type() == nsEventHandler::eOnError) {
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MOZ_ASSERT_IF(mEventName, mEventName == nsGkAtoms::onerror);
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nsString errorMsg, file;
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EventOrString msgOrEvent;
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Optional<nsAString> fileName;
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Optional<uint32_t> lineNumber;
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Optional<uint32_t> columnNumber;
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NS_ENSURE_TRUE(aEvent, NS_ERROR_UNEXPECTED);
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InternalScriptErrorEvent* scriptEvent =
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aEvent->GetInternalNSEvent()->AsScriptErrorEvent();
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if (scriptEvent &&
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(scriptEvent->message == NS_LOAD_ERROR ||
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scriptEvent->typeString.EqualsLiteral("error"))) {
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errorMsg = scriptEvent->errorMsg;
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msgOrEvent.SetAsString().SetData(errorMsg.Data(), errorMsg.Length());
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file = scriptEvent->fileName;
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fileName = &file;
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lineNumber.Construct();
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lineNumber.Value() = scriptEvent->lineNr;
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} else {
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msgOrEvent.SetAsEvent() = aEvent->InternalDOMEvent();
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}
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nsRefPtr<OnErrorEventHandlerNonNull> handler =
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mHandler.OnErrorEventHandler();
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ErrorResult rv;
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bool handled = handler->Call(mTarget, msgOrEvent, fileName, lineNumber,
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columnNumber, rv);
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if (rv.Failed()) {
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return rv.ErrorCode();
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}
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if (handled) {
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aEvent->PreventDefault();
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}
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return NS_OK;
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}
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if (mHandler.Type() == nsEventHandler::eOnBeforeUnload) {
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MOZ_ASSERT(mEventName == nsGkAtoms::onbeforeunload);
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nsRefPtr<OnBeforeUnloadEventHandlerNonNull> handler =
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mHandler.OnBeforeUnloadEventHandler();
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ErrorResult rv;
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nsString retval;
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handler->Call(mTarget, *(aEvent->InternalDOMEvent()), retval, rv);
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if (rv.Failed()) {
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return rv.ErrorCode();
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}
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nsCOMPtr<nsIDOMBeforeUnloadEvent> beforeUnload = do_QueryInterface(aEvent);
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NS_ENSURE_STATE(beforeUnload);
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if (!DOMStringIsNull(retval)) {
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aEvent->PreventDefault();
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nsAutoString text;
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beforeUnload->GetReturnValue(text);
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// Set the text in the beforeUnload event as long as it wasn't
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// already set (through event.returnValue, which takes
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// precedence over a value returned from a JS function in IE)
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if (text.IsEmpty()) {
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beforeUnload->SetReturnValue(retval);
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}
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}
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return NS_OK;
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}
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MOZ_ASSERT(mHandler.Type() == nsEventHandler::eNormal);
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ErrorResult rv;
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nsRefPtr<EventHandlerNonNull> handler = mHandler.EventHandler();
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JS::Value retval =
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handler->Call(mTarget, *(aEvent->InternalDOMEvent()), rv);
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if (rv.Failed()) {
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return rv.ErrorCode();
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}
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// If the handler returned false and its sense is not reversed,
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// or the handler returned true and its sense is reversed from
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// the usual (false means cancel), then prevent default.
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if (retval.isBoolean() &&
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retval.toBoolean() == (mEventName == nsGkAtoms::onerror ||
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mEventName == nsGkAtoms::onmouseover)) {
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aEvent->PreventDefault();
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}
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return NS_OK;
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}
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/*
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* Factory functions
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*/
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nsresult
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NS_NewJSEventListener(JSObject* aScopeObject,
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nsISupports*aTarget, nsIAtom* aEventType,
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const nsEventHandler& aHandler,
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nsIJSEventListener** aReturn)
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{
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NS_ENSURE_ARG(aEventType || !NS_IsMainThread());
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nsJSEventListener* it =
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new nsJSEventListener(aScopeObject, aTarget, aEventType, aHandler);
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NS_ADDREF(*aReturn = it);
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return NS_OK;
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}
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