1/*
2 * Copyright (C) 2012, 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. ``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 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 "CodeBlockHash.h"
28
29#include "SourceCode.h"
30#include <wtf/SHA1.h>
31#include <wtf/SixCharacterHash.h>
32
33namespace JSC {
34
35CodeBlockHash::CodeBlockHash(const char* string)
36    : m_hash(sixCharacterHashStringToInteger(string))
37{
38}
39
40CodeBlockHash::CodeBlockHash(const SourceCode& sourceCode, CodeSpecializationKind kind)
41    : m_hash(0)
42{
43    SHA1 sha1;
44    sha1.addBytes(sourceCode.toUTF8());
45    SHA1::Digest digest;
46    sha1.computeHash(digest);
47    m_hash += digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24);
48    m_hash ^= static_cast<unsigned>(kind);
49
50    // Ensure that 0 corresponds to the hash not having been computed.
51    if (!m_hash)
52        m_hash = 1;
53}
54
55void CodeBlockHash::dump(PrintStream& out) const
56{
57    std::array<char, 7> buffer = integerToSixCharacterHashString(m_hash);
58
59#if !ASSERT_DISABLED
60    CodeBlockHash recompute(buffer.data());
61    ASSERT(recompute == *this);
62#endif // !ASSERT_DISABLED
63
64    out.print(buffer.data());
65}
66
67} // namespace JSC
68
69