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Side by Side Diff: third_party/WebKit/Source/wtf/StaticConstructors.h

Issue 2755793004: Move files in wtf/ to platform/wtf/ (Part 3). (Closed)
Patch Set: Created 3 years, 9 months ago
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1 /* 1 // Copyright 2017 The Chromium Authors. All rights reserved.
2 * Copyright (C) 2006 Apple Computer, Inc. 2 // Use of this source code is governed by a BSD-style license that can be
3 * 3 // found in the LICENSE file.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 *
19 */
20 4
21 #ifndef StaticConstructors_h 5 #include "platform/wtf/StaticConstructors.h"
22 #define StaticConstructors_h
23 6
24 // We need to avoid having static constructors. This is accomplished by defining 7 // The contents of this header was moved to platform/wtf as part of
25 // a static array of the appropriate size and alignment, and defining a const 8 // WTF migration project. See the following post for details:
26 // reference that points to the buffer. During initialization, the object will 9 // https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gY CAAJ
27 // be constructed with placement new into the buffer. This works with MSVC, GCC,
28 // and Clang without producing dynamic initialization code even at -O0. The only
29 // downside is that all external translation units will have to emit one more
30 // load, while a real global could be referenced directly by absolute or
31 // relative addressing.
32
33 // Use an array of pointers instead of an array of char in case there is some
34 // alignment issue.
35 #define DEFINE_GLOBAL(type, name) \
36 void* name##Storage[(sizeof(type) + sizeof(void*) - 1) / sizeof(void*)]; \
37 const type& name = *reinterpret_cast<type*>(&name##Storage)
38
39 #endif // StaticConstructors_h
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