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author | Lars Knoll <lars.knoll@nokia.com> | 2009-03-23 09:34:13 (GMT) |
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committer | Simon Hausmann <simon.hausmann@nokia.com> | 2009-03-23 09:34:13 (GMT) |
commit | 67ad0519fd165acee4a4d2a94fa502e9e4847bd0 (patch) | |
tree | 1dbf50b3dff8d5ca7e9344733968c72704eb15ff /src/3rdparty/webkit/WebCore/rendering/RenderArena.cpp | |
download | Qt-67ad0519fd165acee4a4d2a94fa502e9e4847bd0.zip Qt-67ad0519fd165acee4a4d2a94fa502e9e4847bd0.tar.gz Qt-67ad0519fd165acee4a4d2a94fa502e9e4847bd0.tar.bz2 |
Long live Qt!
Diffstat (limited to 'src/3rdparty/webkit/WebCore/rendering/RenderArena.cpp')
-rw-r--r-- | src/3rdparty/webkit/WebCore/rendering/RenderArena.cpp | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/WebCore/rendering/RenderArena.cpp b/src/3rdparty/webkit/WebCore/rendering/RenderArena.cpp new file mode 100644 index 0000000..69d08a5 --- /dev/null +++ b/src/3rdparty/webkit/WebCore/rendering/RenderArena.cpp @@ -0,0 +1,135 @@ +/* + * Copyright (C) 2003 Apple Computer, Inc. + * + * Portions are Copyright (C) 1998 Netscape Communications Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + * + * Alternatively, the contents of this file may be used under the terms + * of either the Mozilla Public License Version 1.1, found at + * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public + * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html + * (the "GPL"), in which case the provisions of the MPL or the GPL are + * applicable instead of those above. If you wish to allow use of your + * version of this file only under the terms of one of those two + * licenses (the MPL or the GPL) and not to allow others to use your + * version of this file under the LGPL, indicate your decision by + * deletingthe provisions above and replace them with the notice and + * other provisions required by the MPL or the GPL, as the case may be. + * If you do not delete the provisions above, a recipient may use your + * version of this file under any of the LGPL, the MPL or the GPL. + */ + +#include "config.h" +#include "RenderArena.h" + +#include <stdlib.h> +#include <string.h> +#include <wtf/Assertions.h> + +#define ROUNDUP(x,y) ((((x)+((y)-1))/(y))*(y)) + +namespace WebCore { + +#ifndef NDEBUG + +const int signature = 0xDBA00AEA; +const int signatureDead = 0xDBA00AED; + +typedef struct { + RenderArena* arena; + size_t size; + int signature; +} RenderArenaDebugHeader; + +#endif + +RenderArena::RenderArena(unsigned arenaSize) +{ + // Initialize the arena pool + INIT_ARENA_POOL(&m_pool, "RenderArena", arenaSize); + + // Zero out the recyclers array + memset(m_recyclers, 0, sizeof(m_recyclers)); +} + +RenderArena::~RenderArena() +{ + FinishArenaPool(&m_pool); +} + +void* RenderArena::allocate(size_t size) +{ +#ifndef NDEBUG + // Use standard malloc so that memory debugging tools work. + ASSERT(this); + void* block = ::malloc(sizeof(RenderArenaDebugHeader) + size); + RenderArenaDebugHeader* header = (RenderArenaDebugHeader*)block; + header->arena = this; + header->size = size; + header->signature = signature; + return header + 1; +#else + void* result = 0; + + // Ensure we have correct alignment for pointers. Important for Tru64 + size = ROUNDUP(size, sizeof(void*)); + + // Check recyclers first + if (size < gMaxRecycledSize) { + const int index = size >> 2; + + result = m_recyclers[index]; + if (result) { + // Need to move to the next object + void* next = *((void**)result); + m_recyclers[index] = next; + } + } + + if (!result) { + // Allocate a new chunk from the arena + ARENA_ALLOCATE(result, &m_pool, size); + } + + return result; +#endif +} + +void RenderArena::free(size_t size, void* ptr) +{ +#ifndef NDEBUG + // Use standard free so that memory debugging tools work. + RenderArenaDebugHeader* header = (RenderArenaDebugHeader*)ptr - 1; + ASSERT(header->signature == signature); + ASSERT(header->size == size); + ASSERT(header->arena == this); + header->signature = signatureDead; + ::free(header); +#else + // Ensure we have correct alignment for pointers. Important for Tru64 + size = ROUNDUP(size, sizeof(void*)); + + // See if it's a size that we recycle + if (size < gMaxRecycledSize) { + const int index = size >> 2; + void* currentTop = m_recyclers[index]; + m_recyclers[index] = ptr; + *((void**)ptr) = currentTop; + } +#endif +} + +} // namespace WebCore |