Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 63 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/wtf/Alignment.h b/Source/JavaScriptCore/wtf/Alignment.h
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+++ b/Source/JavaScriptCore/wtf/Alignment.h
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+/*
+ *  Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Library General Public License
+ *  along with this library; see the file COPYING.LIB.  If not, write to
+ *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef WTF_Alignment_h
+#define WTF_Alignment_h
+
+#include "Platform.h"
+#include <algorithm>
+
+namespace WTF {
+
+#if COMPILER(GCC) || COMPILER(MINGW) || COMPILER(RVCT) || COMPILER(GCCE)
+    #define WTF_ALIGN_OF(type) __alignof__(type)
+    #define WTF_ALIGNED(variable_type, variable, n) variable_type variable __attribute__((__aligned__(n)))
+#elif COMPILER(MSVC)
+    #define WTF_ALIGN_OF(type) __alignof(type)
+    #define WTF_ALIGNED(variable_type, variable, n) __declspec(align(n)) variable_type variable
+#else
+    #error WTF_ALIGN macros need alignment control.
+#endif
+
+#if COMPILER(GCC) && !COMPILER(INTEL) && (((__GNUC__ * 100) + __GNUC_MINOR__) >= 303)
+    typedef char __attribute__((__may_alias__)) AlignedBufferChar; 
+#else
+    typedef char AlignedBufferChar; 
+#endif
+
+    template<size_t size, size_t alignment> struct AlignedBuffer;
+    template<size_t size> struct AlignedBuffer<size, 1> { AlignedBufferChar buffer[size]; };
+    template<size_t size> struct AlignedBuffer<size, 2> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 2);  };
+    template<size_t size> struct AlignedBuffer<size, 4> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 4);  };
+    template<size_t size> struct AlignedBuffer<size, 8> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 8);  };
+    template<size_t size> struct AlignedBuffer<size, 16> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 16); };
+    template<size_t size> struct AlignedBuffer<size, 32> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 32); };
+    template<size_t size> struct AlignedBuffer<size, 64> { WTF_ALIGNED(AlignedBufferChar, buffer[size], 64); };
+
+    template <size_t size, size_t alignment>
+    void swap(AlignedBuffer<size, alignment>& a, AlignedBuffer<size, alignment>& b)
+    {
+        for (size_t i = 0; i < size; ++i)
+            std::swap(a.buffer[i], b.buffer[i]);
+    }
+
+}
+
+#endif // WTF_Alignment_h