| /* |
| * Copyright (C) 2010 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <memory> |
| #include "base/memory/scoped_refptr.h" |
| #include "third_party/blink/renderer/platform/wtf/assertions.h" |
| #include "third_party/blink/renderer/platform/wtf/container_annotations.h" |
| #include "third_party/blink/renderer/platform/wtf/ref_counted.h" |
| #include "third_party/blink/renderer/platform/wtf/text/atomic_string.h" |
| #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" |
| #include "third_party/blink/renderer/platform/wtf/thread_restriction_verifier.h" |
| #include "third_party/blink/renderer/platform/wtf/vector.h" |
| |
| namespace WTF { |
| |
| struct SameSizeAsRefCounted { |
| uint32_t a; |
| // Don't add anything here because this should stay small. |
| }; |
| |
| template <typename T, unsigned inlineCapacity = 0> |
| struct SameSizeAsVectorWithInlineCapacity; |
| |
| template <typename T> |
| struct SameSizeAsVectorWithInlineCapacity<T, 0> { |
| void* buffer_pointer; |
| unsigned capacity; |
| unsigned size; |
| }; |
| |
| template <typename T, unsigned inlineCapacity> |
| struct SameSizeAsVectorWithInlineCapacity { |
| SameSizeAsVectorWithInlineCapacity<T, 0> base_capacity; |
| #if !defined(ANNOTATE_CONTIGUOUS_CONTAINER) |
| T inline_buffer[inlineCapacity]; |
| #endif |
| }; |
| |
| #if !DCHECK_IS_ON() |
| static_assert(sizeof(RefCounted<int>) == sizeof(SameSizeAsRefCounted), |
| "RefCounted should stay small"); |
| #endif |
| |
| static_assert(sizeof(std::unique_ptr<int>) == sizeof(int*), |
| "std::unique_ptr should stay small"); |
| static_assert(sizeof(scoped_refptr<RefCounted<int>>) == sizeof(int*), |
| "RefPtr should stay small"); |
| static_assert(sizeof(String) == sizeof(int*), "String should stay small"); |
| static_assert(sizeof(AtomicString) == sizeof(String), |
| "AtomicString should stay small"); |
| static_assert(sizeof(Vector<int>) == |
| sizeof(SameSizeAsVectorWithInlineCapacity<int>), |
| "Vector should stay small"); |
| static_assert(sizeof(Vector<int, 1>) == |
| sizeof(SameSizeAsVectorWithInlineCapacity<int, 1>), |
| "Vector should stay small"); |
| static_assert(sizeof(Vector<int, 2>) == |
| sizeof(SameSizeAsVectorWithInlineCapacity<int, 2>), |
| "Vector should stay small"); |
| static_assert(sizeof(Vector<int, 3>) == |
| sizeof(SameSizeAsVectorWithInlineCapacity<int, 3>), |
| "Vector should stay small"); |
| |
| } // namespace WTF |