| /* |
| * Copyright (C) 2012, 2013 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> |
| #include <wtf/SixCharacterHash.h> |
| |
| namespace JSC { |
| |
| CodeBlockHash::CodeBlockHash(const char* string) |
| : m_hash(sixCharacterHashStringToInteger(string)) |
| { |
| } |
| |
| CodeBlockHash::CodeBlockHash(const SourceCode& sourceCode, CodeSpecializationKind kind) |
| : m_hash(0) |
| { |
| SHA1 sha1; |
| sha1.addBytes(sourceCode.toUTF8()); |
| SHA1::Digest digest; |
| sha1.computeHash(digest); |
| m_hash = digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24); |
| |
| if (m_hash == 0 || m_hash == 1) |
| m_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, ""); |
| m_hash ^= static_cast<unsigned>(kind); |
| ASSERT(m_hash); |
| } |
| |
| void CodeBlockHash::dump(PrintStream& out) const |
| { |
| std::array<char, 7> buffer = integerToSixCharacterHashString(m_hash); |
| |
| #if !ASSERT_DISABLED |
| CodeBlockHash recompute(buffer.data()); |
| ASSERT(recompute == *this); |
| #endif // !ASSERT_DISABLED |
| |
| out.print(buffer.data()); |
| } |
| |
| } // namespace JSC |
| |