1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "WriteBarrierBuffer.h"
28
29#include "GCAssertions.h"
30#include "Heap.h"
31#include "JSCell.h"
32#include "JSCInlines.h"
33#include "Structure.h"
34
35namespace JSC {
36
37WriteBarrierBuffer::WriteBarrierBuffer(unsigned capacity)
38    : m_currentIndex(0)
39    , m_capacity(capacity)
40    , m_buffer(static_cast<JSCell**>(fastMalloc(sizeof(JSCell*) * capacity)))
41{
42}
43
44WriteBarrierBuffer::~WriteBarrierBuffer()
45{
46    fastFree(m_buffer);
47    m_buffer = 0;
48}
49
50void WriteBarrierBuffer::flush(Heap& heap)
51{
52    ASSERT(m_currentIndex <= m_capacity);
53    for (size_t i = 0; i < m_currentIndex; ++i)
54        heap.writeBarrier(m_buffer[i]);
55    m_currentIndex = 0;
56}
57
58void WriteBarrierBuffer::reset()
59{
60    m_currentIndex = 0;
61}
62
63void WriteBarrierBuffer::add(JSCell* cell)
64{
65    ASSERT_GC_OBJECT_LOOKS_VALID(cell);
66    ASSERT(m_currentIndex < m_capacity);
67    m_buffer[m_currentIndex++] = cell;
68}
69
70} // namespace JSC
71