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147 lines
4.5 KiB
147 lines
4.5 KiB
/*
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* Copyright (C) 2002 Apple Computer, Inc.
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* Copyright (C) 2003 Dirk Mueller (mueller@kde.org)
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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 "render_arena.h"
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#include <string.h>
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#include <assert.h>
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using namespace khtml;
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namespace khtml {
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//#ifdef NDEBUG
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#define KHTML_USE_ARENA_ALLOCATOR
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//#endif
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typedef struct {
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RenderArena *arena;
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size_t size;
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} RenderArenaDebugHeader;
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#ifdef VALGRIND_SUPPORT
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Arena* findContainingArena(ArenaPool* pool, void* ptr) {
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uword ptrBits = reinterpret_cast<uword>(ptr);
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for (Arena* a = &pool->first; a; a = a->next)
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if (ptrBits >= a->base && ptrBits < a->limit)
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return a;
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return 0; //Should not happen
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}
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#endif
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RenderArena::RenderArena(unsigned int 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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// Free the arena in the pool and finish using it
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FreeArenaPool(&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 KHTML_USE_ARENA_ALLOCATOR
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// Use standard malloc so that memory debugging tools work.
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void *block = ::malloc(sizeof(RenderArenaDebugHeader) + size);
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RenderArenaDebugHeader *header = (RenderArenaDebugHeader *)block;
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header->arena = this;
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header->size = size;
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return header + 1;
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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 = KHTML_ROUNDUP(size, sizeof(void*));
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// Check recyclers first
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if (size < KHTML_MAX_RECYCLED_SIZE) {
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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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#ifdef VALGRIND_SUPPORT
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VALGRIND_MEMPOOL_ALLOC(findContainingArena(&m_pool, result)->base, result, size);
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#endif
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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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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 KHTML_USE_ARENA_ALLOCATOR
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// Use standard free so that memory debugging tools work.
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assert(this);
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RenderArenaDebugHeader *header = (RenderArenaDebugHeader *)ptr - 1;
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assert(header->size == size);
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assert(header->arena == this);
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::free(header);
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#else
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#ifdef VALGRIND_SUPPORT
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VALGRIND_MEMPOOL_FREE(findContainingArena(&m_pool, ptr)->base, ptr);
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#endif
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// Ensure we have correct alignment for pointers. Important for Tru64
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size = KHTML_ROUNDUP(size, sizeof(void*));
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// See if it's a size that we recycle
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if (size < KHTML_MAX_RECYCLED_SIZE) {
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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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