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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/layers/AtomicRefCountedWithFinalize.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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diff --git a/gfx/layers/AtomicRefCountedWithFinalize.h b/gfx/layers/AtomicRefCountedWithFinalize.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * 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/. */
+
+#ifndef MOZILLA_ATOMICREFCOUNTEDWITHFINALIZE_H_
+#define MOZILLA_ATOMICREFCOUNTEDWITHFINALIZE_H_
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/Likely.h"
+#include "MainThreadUtils.h"
+#include "base/message_loop.h"
+#include "base/task.h"
+#include "mozilla/gfx/Logging.h"
+
+#define ADDREF_MANUALLY(obj) (obj)->AddRefManually(__FUNCTION__, __FILE__, __LINE__)
+#define RELEASE_MANUALLY(obj) (obj)->ReleaseManually(__FUNCTION__, __FILE__, __LINE__)
+
+namespace mozilla {
+
+template<class U>
+class StaticRefPtr;
+
+namespace gl {
+template<typename T>
+class RefSet;
+
+template<typename T>
+class RefQueue;
+} // namespace gl
+
+template<typename T>
+class AtomicRefCountedWithFinalize
+{
+protected:
+ explicit AtomicRefCountedWithFinalize(const char* aName)
+ : mRecycleCallback(nullptr)
+ , mRefCount(0)
+#ifdef DEBUG
+ , mSpew(false)
+ , mManualAddRefs(0)
+ , mManualReleases(0)
+#endif
+#ifdef NS_BUILD_REFCNT_LOGGING
+ , mName(aName)
+#endif
+ {}
+
+ ~AtomicRefCountedWithFinalize() {
+ if (mRefCount >= 0) {
+ gfxCriticalError() << "Deleting referenced object? " << mRefCount;
+ }
+ }
+
+public:
+ // Mark user classes that are considered flawless.
+ template<class U>
+ friend class ::mozilla::StaticRefPtr;
+
+ template<class U>
+ friend struct mozilla::RefPtrTraits;
+
+ template<typename U>
+ friend class ::mozilla::gl::RefSet;
+
+ template<typename U>
+ friend class ::mozilla::gl::RefQueue;
+
+ //friend class mozilla::gl::SurfaceFactory;
+
+ void AddRefManually(const char* funcName, const char* fileName, uint32_t lineNum) {
+#ifdef DEBUG
+ uint32_t count = ++mManualAddRefs;
+ if (mSpew) {
+ printf_stderr("AddRefManually() #%u in %s at %s:%u\n", count, funcName,
+ fileName, lineNum);
+ }
+#else
+ (void)funcName;
+ (void)fileName;
+ (void)lineNum;
+#endif
+ AddRef();
+ }
+
+ void ReleaseManually(const char* funcName, const char* fileName, uint32_t lineNum) {
+#ifdef DEBUG
+ uint32_t count = ++mManualReleases;
+ if (mSpew) {
+ printf_stderr("ReleaseManually() #%u in %s at %s:%u\n", count, funcName,
+ fileName, lineNum);
+ }
+#else
+ (void)funcName;
+ (void)fileName;
+ (void)lineNum;
+#endif
+ Release();
+ }
+
+private:
+ void AddRef() {
+ MOZ_ASSERT(mRefCount >= 0, "AddRef() during/after Finalize()/dtor.");
+ mRefCount++;
+ NS_LOG_ADDREF(this, mRefCount, mName, sizeof(*this));
+ }
+
+ void Release() {
+ MOZ_ASSERT(mRefCount > 0, "Release() during/after Finalize()/dtor.");
+ // Read mRecycleCallback early so that it does not get set to
+ // deleted memory, if the object is goes away. See bug 994903.
+ // This saves us in the case where there is no callback, so that
+ // we can do the "else if" below.
+ RecycleCallback recycleCallback = mRecycleCallback;
+ int currCount = --mRefCount;
+ if (currCount < 0) {
+ gfxCriticalError() << "Invalid reference count release" << currCount;
+ ++mRefCount;
+ return;
+ }
+ NS_LOG_RELEASE(this, currCount, mName);
+
+ if (0 == currCount) {
+ mRefCount = detail::DEAD;
+ MOZ_ASSERT(IsDead());
+
+ // Recycle listeners must call ClearRecycleCallback
+ // before releasing their strong reference.
+ if (mRecycleCallback) {
+ gfxCriticalError() << "About to release with valid callback";
+ mRecycleCallback = nullptr;
+ }
+
+ MOZ_ASSERT(mManualAddRefs == mManualReleases);
+
+ T* derived = static_cast<T*>(this);
+ derived->Finalize();
+ delete derived;
+ } else if (1 == currCount && recycleCallback) {
+ // There is nothing enforcing this in the code, except how the callers
+ // are being careful to never let the reference count go down if there
+ // is a callback.
+ MOZ_ASSERT(!IsDead());
+ T* derived = static_cast<T*>(this);
+ recycleCallback(derived, mClosure);
+ }
+ }
+
+public:
+ typedef void (*RecycleCallback)(T* aObject, void* aClosure);
+ /**
+ * Set a callback responsible for recycling this object
+ * before it is finalized.
+ */
+ void SetRecycleCallback(RecycleCallback aCallback, void* aClosure)
+ {
+ MOZ_ASSERT(!IsDead());
+ mRecycleCallback = aCallback;
+ mClosure = aClosure;
+ }
+ void ClearRecycleCallback()
+ {
+ MOZ_ASSERT(!IsDead());
+ SetRecycleCallback(nullptr, nullptr);
+ }
+
+ bool HasRecycleCallback() const
+ {
+ MOZ_ASSERT(!IsDead());
+ return !!mRecycleCallback;
+ }
+
+ bool IsDead() const
+ {
+ return mRefCount < 0;
+ }
+
+private:
+ RecycleCallback mRecycleCallback;
+ void *mClosure;
+ Atomic<int> mRefCount;
+#ifdef DEBUG
+public:
+ bool mSpew;
+private:
+ Atomic<uint32_t> mManualAddRefs;
+ Atomic<uint32_t> mManualReleases;
+#endif
+#ifdef NS_BUILD_REFCNT_LOGGING
+ const char* mName;
+#endif
+};
+
+} // namespace mozilla
+
+#endif