2 * Copyright (C) 2003 Apple Computer, Inc.
3 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
5 * Portions are Copyright (C) 1998 Netscape Communications Corporation.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * Alternatively, the contents of this file may be used under the terms
22 * of either the Mozilla Public License Version 1.1, found at
23 * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
24 * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
25 * (the "GPL"), in which case the provisions of the MPL or the GPL are
26 * applicable instead of those above. If you wish to allow use of your
27 * version of this file only under the terms of one of those two
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29 * version of this file under the LGPL, indicate your decision by
30 * deletingthe provisions above and replace them with the notice and
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32 * If you do not delete the provisions above, a recipient may use your
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37 #include "RenderArena.h"
41 #include <wtf/Assertions.h>
43 #define ROUNDUP(x, y) ((((x)+((y)-1))/(y))*(y))
49 const int signature = 0xDBA00AEA;
50 const int signatureDead = 0xDBA00AED;
56 } RenderArenaDebugHeader;
58 static const size_t debugHeaderSize = ARENA_ALIGN(sizeof(RenderArenaDebugHeader));
62 RenderArena::RenderArena(unsigned arenaSize)
64 // Initialize the arena pool
65 INIT_ARENA_POOL(&m_pool, "RenderArena", arenaSize);
67 // Zero out the recyclers array
68 memset(m_recyclers, 0, sizeof(m_recyclers));
73 RenderArena::~RenderArena()
75 FinishArenaPool(&m_pool);
78 void* RenderArena::allocate(size_t size)
83 // Use standard malloc so that memory debugging tools work.
85 void* block = ::malloc(debugHeaderSize + size);
86 RenderArenaDebugHeader* header = static_cast<RenderArenaDebugHeader*>(block);
89 header->signature = signature;
90 return static_cast<char*>(block) + debugHeaderSize;
94 // Ensure we have correct alignment for pointers. Important for Tru64
95 size = ROUNDUP(size, sizeof(void*));
97 // Check recyclers first
98 if (size < gMaxRecycledSize) {
99 const int index = size >> 2;
101 result = m_recyclers[index];
103 // Need to move to the next object
104 void* next = *((void**)result);
105 m_recyclers[index] = next;
110 // Allocate a new chunk from the arena
111 ARENA_ALLOCATE(result, &m_pool, size);
118 void RenderArena::free(size_t size, void* ptr)
123 // Use standard free so that memory debugging tools work.
124 void* block = static_cast<char*>(ptr) - debugHeaderSize;
125 RenderArenaDebugHeader* header = static_cast<RenderArenaDebugHeader*>(block);
126 ASSERT(header->signature == signature);
127 ASSERT_UNUSED(size, header->size == size);
128 ASSERT(header->arena == this);
129 header->signature = signatureDead;
132 // Ensure we have correct alignment for pointers. Important for Tru64
133 size = ROUNDUP(size, sizeof(void*));
135 // See if it's a size that we recycle
136 if (size < gMaxRecycledSize) {
137 const int index = size >> 2;
138 void* currentTop = m_recyclers[index];
139 m_recyclers[index] = ptr;
140 *((void**)ptr) = currentTop;
145 } // namespace WebCore