1 /*
2 * Copyright (C) 2008 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 COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "StructureChain.h"
28
29 #include "JSObject.h"
30 #include "Structure.h"
31 #include <wtf/RefPtr.h>
32
33 namespace JSC {
34
StructureChain(Structure * structure)35 StructureChain::StructureChain(Structure* structure)
36 {
37 size_t size = 1;
38
39 Structure* tmp = structure;
40 while (!tmp->storedPrototype().isNull()) {
41 ++size;
42 tmp = asCell(tmp->storedPrototype())->structure();
43 }
44
45 m_vector.set(new RefPtr<Structure>[size + 1]);
46
47 size_t i;
48 for (i = 0; i < size - 1; ++i) {
49 m_vector[i] = structure;
50 structure = asObject(structure->storedPrototype())->structure();
51 }
52 m_vector[i] = structure;
53 m_vector[i + 1] = 0;
54 }
55
structureChainsAreEqual(StructureChain * chainA,StructureChain * chainB)56 bool structureChainsAreEqual(StructureChain* chainA, StructureChain* chainB)
57 {
58 if (!chainA || !chainB)
59 return false;
60
61 RefPtr<Structure>* a = chainA->head();
62 RefPtr<Structure>* b = chainB->head();
63 while (1) {
64 if (*a != *b)
65 return false;
66 if (!*a)
67 return true;
68 a++;
69 b++;
70 }
71 }
72
73 } // namespace JSC
74