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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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