зеркало из https://github.com/mozilla/gecko-dev.git
Bug 1273661 part 2. Add a way to trace a RefPtr<T> or OwningNonNull<T> via a Rooted. r=terrence,smaug
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@ -17,11 +17,11 @@
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#include "js/Value.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/OwningNonNull.h"
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#include "mozilla/RootedOwningNonNull.h"
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#include "mozilla/RootedRefPtr.h"
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#include "mozilla/dom/DOMString.h"
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#include "nsAutoPtr.h" // for nsRefPtr member variables
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#include "nsCOMPtr.h"
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#include "nsStringGlue.h"
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#include "nsTArray.h"
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@ -0,0 +1,73 @@
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/* -*- 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* An implementation of Rooted for OwningNonNull<T>. This works by assuming
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* that T has a Trace() method defined on it which will trace whatever things
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* inside the T instance need tracing.
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*
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* This implementation has one serious drawback: operator= doesn't work right
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* because it's declared on Rooted directly and expects the type Rooted is
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* templated over.
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*/
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#ifndef mozilla_RootedOwningNonNull_h__
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#define mozilla_RootedOwningNonNull_h__
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#include "mozilla/OwningNonNull.h"
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#include "js/GCPolicyAPI.h"
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#include "js/RootingAPI.h"
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namespace JS {
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template<typename T>
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struct GCPolicy<mozilla::OwningNonNull<T>>
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{
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typedef mozilla::OwningNonNull<T> SmartPtrType;
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static SmartPtrType initial()
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{
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return SmartPtrType();
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}
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static void trace(JSTracer* trc, SmartPtrType* tp,
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const char* name)
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{
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// We have to be very careful here. Normally, OwningNonNull can't be null.
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// But binding code can end up in a situation where it sets up a
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// Rooted<OwningNonNull> and then before it gets a chance to assign to it
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// (e.g. from the constructor of the thing being assigned) a GC happens. So
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// we can land here when *tp stores a null pointer because it's not
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// initialized.
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//
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// So we need to check for that before jumping.
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if ((*tp).isInitialized()) {
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(*tp)->Trace(trc);
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}
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}
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};
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} // namespace JS
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namespace js {
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template<typename T>
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struct RootedBase<mozilla::OwningNonNull<T>>
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{
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typedef mozilla::OwningNonNull<T> SmartPtrType;
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operator SmartPtrType& () const
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{
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auto& self = *static_cast<const JS::Rooted<SmartPtrType>*>(this);
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return self.get();
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}
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operator T& () const
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{
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auto& self = *static_cast<const JS::Rooted<SmartPtrType>*>(this);
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return self.get();
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}
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};
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} // namespace js
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#endif /* mozilla_RootedOwningNonNull_h__ */
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@ -0,0 +1,59 @@
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/* -*- 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* An implementation of Rooted for RefPtr<T>. This works by assuming that T has
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* a Trace() method defined on it which will trace whatever things inside the T
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* instance need tracing.
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*
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* This implementation has one serious drawback: operator= doesn't work right
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* because it's declared on Rooted directly and expects the type Rooted is
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* templated over.
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*/
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#ifndef mozilla_RootedRefPtr_h__
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#define mozilla_RootedRefPtr_h__
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#include "mozilla/RefPtr.h"
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#include "js/GCPolicyAPI.h"
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#include "js/RootingAPI.h"
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namespace JS {
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template<typename T>
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struct GCPolicy<RefPtr<T>>
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{
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static RefPtr<T> initial() {
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return RefPtr<T>();
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}
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static void trace(JSTracer* trc, RefPtr<T>* tp, const char* name)
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{
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if (*tp) {
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(*tp)->Trace(trc);
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}
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}
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};
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} // namespace JS
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namespace js {
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template<typename T>
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struct RootedBase<RefPtr<T>>
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{
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operator RefPtr<T>& () const
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{
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auto& self = *static_cast<const JS::Rooted<RefPtr<T>>*>(this);
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return self.get();
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}
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operator T*() const
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{
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auto& self = *static_cast<const JS::Rooted<RefPtr<T>>*>(this);
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return self.get();
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}
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};
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} // namespace js
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#endif /* mozilla_RootedRefPtr_h__ */
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@ -12,6 +12,8 @@ EXPORTS.ipc += [
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EXPORTS.mozilla += [
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'ErrorResult.h',
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'RootedOwningNonNull.h',
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'RootedRefPtr.h',
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]
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EXPORTS.mozilla.dom += [
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@ -126,6 +126,18 @@ public:
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void swap(U& aOther)
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{
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mPtr.swap(aOther);
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#ifdef DEBUG
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mInited = mPtr;
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#endif
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}
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// We have some consumers who want to check whether we're inited in non-debug
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// builds as well. Luckily, we have the invariant that we're inited precisely
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// when mPtr is non-null.
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bool isInitialized() const
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{
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MOZ_ASSERT(!!mPtr == mInited, "mInited out of sync with mPtr?");
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return mPtr;
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}
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protected:
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