/* * 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> #include <wtf/SixCharacterHash.h> namespace JSC { ParseHash::ParseHash(const SourceCode& sourceCode) { SHA1 sha1; sha1.addBytes(sourceCode.toUTF8()); 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