author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 04 Oct 2010 01:32:07 +0300 | |
changeset 2 | 303757a437d3 |
parent 0 | 4f2f89ce4247 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2003 Apple Computer, Inc. |
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* Copyright (C) Research In Motion Limited 2010. All rights reserved. |
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* |
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* Portions are Copyright (C) 1998 Netscape Communications Corporation. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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* Alternatively, the contents of this file may be used under the terms |
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* of either the Mozilla Public License Version 1.1, found at |
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* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public |
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* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html |
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* (the "GPL"), in which case the provisions of the MPL or the GPL are |
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* applicable instead of those above. If you wish to allow use of your |
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* version of this file only under the terms of one of those two |
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* licenses (the MPL or the GPL) and not to allow others to use your |
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* version of this file under the LGPL, indicate your decision by |
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* deletingthe provisions above and replace them with the notice and |
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* other provisions required by the MPL or the GPL, as the case may be. |
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* If you do not delete the provisions above, a recipient may use your |
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* version of this file under any of the LGPL, the MPL or the GPL. |
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*/ |
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#include "config.h" |
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#include "RenderArena.h" |
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#include <stdlib.h> |
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#include <string.h> |
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#include <wtf/Assertions.h> |
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#define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y)) |
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namespace WebCore { |
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#ifndef NDEBUG |
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const int signature = 0xDBA00AEA; |
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const int signatureDead = 0xDBA00AED; |
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typedef struct { |
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RenderArena* arena; |
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size_t size; |
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int signature; |
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} RenderArenaDebugHeader; |
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static const size_t debugHeaderSize = ARENA_ALIGN(sizeof(RenderArenaDebugHeader)); |
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#endif |
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RenderArena::RenderArena(unsigned arenaSize) |
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{ |
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// Initialize the arena pool |
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INIT_ARENA_POOL(&m_pool, "RenderArena", arenaSize); |
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// Zero out the recyclers array |
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memset(m_recyclers, 0, sizeof(m_recyclers)); |
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} |
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RenderArena::~RenderArena() |
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{ |
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FinishArenaPool(&m_pool); |
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} |
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void* RenderArena::allocate(size_t size) |
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{ |
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#ifndef NDEBUG |
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// Use standard malloc so that memory debugging tools work. |
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ASSERT(this); |
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void* block = ::malloc(debugHeaderSize + size); |
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RenderArenaDebugHeader* header = static_cast<RenderArenaDebugHeader*>(block); |
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header->arena = this; |
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header->size = size; |
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header->signature = signature; |
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return static_cast<char*>(block) + debugHeaderSize; |
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#else |
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void* result = 0; |
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// Ensure we have correct alignment for pointers. Important for Tru64 |
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size = ROUNDUP(size, sizeof(void*)); |
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// Check recyclers first |
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if (size < gMaxRecycledSize) { |
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const int index = size >> 2; |
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result = m_recyclers[index]; |
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if (result) { |
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// Need to move to the next object |
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void* next = *((void**)result); |
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m_recyclers[index] = next; |
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} |
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} |
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if (!result) { |
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// Allocate a new chunk from the arena |
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ARENA_ALLOCATE(result, &m_pool, size); |
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} |
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|
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return result; |
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#endif |
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} |
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void RenderArena::free(size_t size, void* ptr) |
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{ |
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#ifndef NDEBUG |
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// Use standard free so that memory debugging tools work. |
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void* block = static_cast<char*>(ptr) - debugHeaderSize; |
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RenderArenaDebugHeader* header = static_cast<RenderArenaDebugHeader*>(block); |
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ASSERT(header->signature == signature); |
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ASSERT_UNUSED(size, header->size == size); |
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ASSERT(header->arena == this); |
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header->signature = signatureDead; |
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::free(block); |
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#else |
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// Ensure we have correct alignment for pointers. Important for Tru64 |
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size = ROUNDUP(size, sizeof(void*)); |
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|
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// See if it's a size that we recycle |
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if (size < gMaxRecycledSize) { |
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const int index = size >> 2; |
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void* currentTop = m_recyclers[index]; |
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m_recyclers[index] = ptr; |
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*((void**)ptr) = currentTop; |
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} |
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#endif |
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} |
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|
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} // namespace WebCore |