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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "CodeBlockHash.h"
#include "SourceCode.h"
#include <wtf/SHA1.h>
namespace JSC {
#define TABLE ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789")
CodeBlockHash::CodeBlockHash(const char* string)
: m_hash(0)
{
if (strlen(string) != 6)
CRASH();
for (unsigned i = 0; i < 6; ++i) {
m_hash *= 62;
unsigned c = string[i];
if (c >= 'A' && c <= 'Z') {
m_hash += c - 'A';
continue;
}
if (c >= 'a' && c <= 'z') {
m_hash += c - 'a' + 26;
continue;
}
ASSERT(c >= '0' && c <= '9');
m_hash += c - '0' + 26 * 2;
}
}
CodeBlockHash::CodeBlockHash(const SourceCode& sourceCode, CodeSpecializationKind kind)
: m_hash(0)
{
SHA1 sha1;
sha1.addBytes(sourceCode.toString().utf8());
Vector<uint8_t, 20> digest;
sha1.computeHash(digest);
m_hash += digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24);
m_hash ^= static_cast<unsigned>(kind);
}
void CodeBlockHash::dump(PrintStream& out) const
{
ASSERT(strlen(TABLE) == 62);
char buffer[7];
unsigned accumulator = m_hash;
for (unsigned i = 6; i--;) {
buffer[i] = TABLE[accumulator % 62];
accumulator /= 62;
}
buffer[6] = 0;
#if !ASSERT_DISABLED
CodeBlockHash recompute(buffer);
ASSERT(recompute == *this);
#endif // !ASSERT_DISABLED
out.print(buffer);
}
} // namespace JSC