1 /*
2 * Copyright (C) 2011 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 "ConservativeRoots.h"
28
29 namespace JSC {
30
isPointerAligned(void * p)31 inline bool isPointerAligned(void* p)
32 {
33 return !((intptr_t)(p) & (sizeof(char*) - 1));
34 }
35
grow()36 void ConservativeRoots::grow()
37 {
38 size_t newCapacity = m_capacity == inlineCapacity ? nonInlineCapacity : m_capacity * 2;
39 JSCell** newRoots = static_cast<JSCell**>(OSAllocator::reserveAndCommit(newCapacity * sizeof(JSCell*)));
40 memcpy(newRoots, m_roots, m_size * sizeof(JSCell*));
41 if (m_roots != m_inlineRoots)
42 OSAllocator::decommitAndRelease(m_roots, m_capacity * sizeof(JSCell*));
43 m_capacity = newCapacity;
44 m_roots = newRoots;
45 }
46
add(void * begin,void * end)47 void ConservativeRoots::add(void* begin, void* end)
48 {
49 ASSERT(begin <= end);
50 ASSERT((static_cast<char*>(end) - static_cast<char*>(begin)) < 0x1000000);
51 ASSERT(isPointerAligned(begin));
52 ASSERT(isPointerAligned(end));
53
54 for (char** it = static_cast<char**>(begin); it != static_cast<char**>(end); ++it)
55 add(*it);
56 }
57
58 } // namespace JSC
59