mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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57 lines
2.3 KiB
C++
57 lines
2.3 KiB
C++
/*
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* Copyright (C) 2018 Yusuke Suzuki <utatane.tea@gmail.com>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "ParseHash.h"
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#include "SourceCode.h"
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#include <wtf/SHA1.h>
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namespace JSC {
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ParseHash::ParseHash(const SourceCode& sourceCode)
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{
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SHA1 sha1;
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sha1.addBytes(sourceCode.toUTF8());
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SHA1::Digest digest;
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sha1.computeHash(digest);
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unsigned hash = digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24);
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if (hash == 0 || hash == 1)
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hash += 0x2d5a93d0; // Ensures a non-zero hash, and gets us #Azero0 for CodeForCall and #Azero1 for CodeForConstruct.
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static_assert(static_cast<unsigned>(CodeForCall) == 0, "");
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static_assert(static_cast<unsigned>(CodeForConstruct) == 1, "");
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unsigned hashForCall = hash ^ static_cast<unsigned>(CodeForCall);
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unsigned hashForConstruct = hash ^ static_cast<unsigned>(CodeForConstruct);
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m_hashForCall = CodeBlockHash(hashForCall);
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m_hashForConstruct = CodeBlockHash(hashForConstruct);
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ASSERT(hashForCall);
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ASSERT(hashForConstruct);
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}
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} // namespace JSC
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