2012-04-30 03:11:19 +00:00
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/* -*- 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_SHAREDBUFFER_H_
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#define MOZILLA_SHAREDBUFFER_H_
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2014-04-03 08:12:29 +00:00
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#include "mozilla/CheckedInt.h"
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2012-04-30 03:11:19 +00:00
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#include "mozilla/mozalloc.h"
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2017-08-28 23:09:06 +00:00
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#include "mozilla/MemoryReporting.h"
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#include "nsISupportsImpl.h"
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2012-04-30 03:11:19 +00:00
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namespace mozilla {
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2015-09-08 00:04:16 +00:00
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class AudioBlockBuffer;
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2017-08-03 05:58:23 +00:00
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class ThreadSharedFloatArrayBufferList;
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2015-09-08 00:04:16 +00:00
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2012-11-22 05:04:27 +00:00
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/**
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* Base class for objects with a thread-safe refcount and a virtual
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* destructor.
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*/
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class ThreadSharedObject {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(ThreadSharedObject)
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2014-04-02 16:21:11 +00:00
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2014-04-13 18:08:10 +00:00
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bool IsShared() { return mRefCnt.get() > 1; }
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2015-09-08 00:04:16 +00:00
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virtual AudioBlockBuffer* AsAudioBlockBuffer() { return nullptr; };
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2017-08-03 05:58:23 +00:00
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virtual ThreadSharedFloatArrayBufferList*
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AsThreadSharedFloatArrayBufferList() {
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return nullptr;
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};
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2015-09-08 00:04:16 +00:00
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2014-04-13 18:08:10 +00:00
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virtual size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
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return 0;
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}
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virtual size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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2018-11-19 13:25:37 +00:00
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2014-04-02 16:21:11 +00:00
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protected:
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// Protected destructor, to discourage deletion outside of Release():
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2012-11-22 05:04:27 +00:00
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virtual ~ThreadSharedObject() {}
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};
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2012-04-30 03:11:19 +00:00
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/**
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* Heap-allocated chunk of arbitrary data with threadsafe refcounting.
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* Typically you would allocate one of these, fill it in, and then treat it as
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* immutable while it's shared.
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2015-09-03 06:45:14 +00:00
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* This only guarantees 4-byte alignment of the data. For alignment we simply
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* assume that the memory from malloc is at least 4-byte aligned and the
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* refcount's size is large enough that SharedBuffer's size is divisible by 4.
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2012-04-30 03:11:19 +00:00
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*/
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2012-11-22 05:04:27 +00:00
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class SharedBuffer : public ThreadSharedObject {
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2012-04-30 03:11:19 +00:00
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public:
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void* Data() { return this + 1; }
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2017-08-10 22:57:04 +00:00
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static already_AddRefed<SharedBuffer> Create(size_t aSize,
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const fallible_t&) {
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void* m = operator new(AllocSize(aSize), fallible);
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if (!m) {
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return nullptr;
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2014-04-03 08:12:29 +00:00
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}
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2015-10-18 05:24:48 +00:00
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RefPtr<SharedBuffer> p = new (m) SharedBuffer();
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2017-08-10 22:57:04 +00:00
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return p.forget();
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}
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static already_AddRefed<SharedBuffer> Create(size_t aSize) {
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void* m = operator new(AllocSize(aSize));
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RefPtr<SharedBuffer> p = new (m) SharedBuffer();
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2012-04-30 03:11:19 +00:00
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return p.forget();
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}
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2017-08-29 03:40:11 +00:00
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size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
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return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
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}
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private:
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2017-08-10 22:57:04 +00:00
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static size_t AllocSize(size_t aDataSize) {
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CheckedInt<size_t> size = sizeof(SharedBuffer);
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size += aDataSize;
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if (!size.isValid()) {
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MOZ_CRASH();
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}
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return size.value();
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}
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SharedBuffer() {
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NS_ASSERTION(
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(reinterpret_cast<char*>(this + 1) - reinterpret_cast<char*>(this)) %
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4 ==
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0,
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"SharedBuffers should be at least 4-byte aligned");
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}
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2012-04-30 03:11:19 +00:00
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};
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2015-07-13 15:25:42 +00:00
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} // namespace mozilla
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2012-04-30 03:11:19 +00:00
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#endif /* MOZILLA_SHAREDBUFFER_H_ */
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