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/*
* Copyright (C) 2018 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* 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 "ParseHash.h"
#include "SourceCode.h"
#include <wtf/SHA1.h>
namespace JSC {
ParseHash::ParseHash(const SourceCode& sourceCode)
{
SHA1 sha1;
sha1.addUTF8Bytes(sourceCode.view());
SHA1::Digest digest;
sha1.computeHash(digest);
unsigned hash = digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24);
if (hash == 0 || hash == 1)
hash += 0x2d5a93d0; // Ensures a non-zero hash, and gets us #Azero0 for CodeForCall and #Azero1 for CodeForConstruct.
static_assert(static_cast<unsigned>(CodeForCall) == 0);
static_assert(static_cast<unsigned>(CodeForConstruct) == 1);
unsigned hashForCall = hash ^ static_cast<unsigned>(CodeForCall);
unsigned hashForConstruct = hash ^ static_cast<unsigned>(CodeForConstruct);
m_hashForCall = CodeBlockHash(hashForCall);
m_hashForConstruct = CodeBlockHash(hashForConstruct);
ASSERT(hashForCall);
ASSERT(hashForConstruct);
}
} // namespace JSC
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