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