92 lines
3.5 KiB
C++
92 lines
3.5 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <type_traits>
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#include <utility>
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#include <wtf/Assertions.h>
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#include <wtf/RefCounted.h>
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#include <wtf/RefPtr.h>
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#include <wtf/Vector.h>
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namespace WTF {
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#if ASSERT_ENABLED || ENABLE(SECURITY_ASSERTIONS)
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struct SameSizeAsRefCounted {
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int a;
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bool b;
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bool c;
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bool d;
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bool e;
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// The debug version may get bigger.
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};
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#else
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struct SameSizeAsRefCounted {
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int a;
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// Don't add anything here because this should stay small.
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};
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#endif
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static_assert(sizeof(RefCounted<int>) == sizeof(SameSizeAsRefCounted), "RefCounted should stay small!");
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static_assert(sizeof(RefPtr<RefCounted<int>>) == sizeof(int*), "RefPtr should stay small!");
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#if !ASAN_ENABLED
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template<typename T, unsigned inlineCapacity = 0>
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struct SameSizeAsVectorWithInlineCapacity;
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template<typename T>
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struct SameSizeAsVectorWithInlineCapacity<T, 0> {
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WTF_MAKE_NONCOPYABLE(SameSizeAsVectorWithInlineCapacity);
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public:
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void* bufferPointer;
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unsigned capacity;
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unsigned size;
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};
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template<typename T>
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struct SameSizeAsVectorWithInlineCapacityBase : SameSizeAsVectorWithInlineCapacity<T> {
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};
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template<typename T, unsigned inlineCapacity>
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struct SameSizeAsVectorWithInlineCapacity : SameSizeAsVectorWithInlineCapacityBase<T> {
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WTF_MAKE_NONCOPYABLE(SameSizeAsVectorWithInlineCapacity);
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public:
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typename std::aligned_storage<sizeof(T), std::alignment_of<T>::value>::type inlineBuffer[inlineCapacity];
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};
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static_assert(sizeof(Vector<int>) == sizeof(SameSizeAsVectorWithInlineCapacity<int>), "Vector should stay small!");
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static_assert(sizeof(Vector<int, 1>) == sizeof(SameSizeAsVectorWithInlineCapacity<int, 1>), "Vector should stay small!");
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static_assert(sizeof(Vector<int, 2>) == sizeof(SameSizeAsVectorWithInlineCapacity<int, 2>), "Vector should stay small!");
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static_assert(sizeof(Vector<int, 3>) == sizeof(SameSizeAsVectorWithInlineCapacity<int, 3>), "Vector should stay small!");
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#endif
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}
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