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/*
* Copyright (C) 2003 Apple Computer, Inc.
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* 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;
static const size_t debugHeaderSize = ARENA_ALIGN(sizeof(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(debugHeaderSize + size);
RenderArenaDebugHeader* header = static_cast<RenderArenaDebugHeader*>(block);
header->arena = this;
header->size = size;
header->signature = signature;
return static_cast<char*>(block) + debugHeaderSize;
#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.
void* block = static_cast<char*>(ptr) - debugHeaderSize;
RenderArenaDebugHeader* header = static_cast<RenderArenaDebugHeader*>(block);
ASSERT(header->signature == signature);
ASSERT_UNUSED(size, header->size == size);
ASSERT(header->arena == this);
header->signature = signatureDead;
::free(block);
#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
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