| /* |
| * 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. |
| */ |
| |
| #ifndef CodeBlockHash_h |
| #define CodeBlockHash_h |
| |
| #include "CodeSpecializationKind.h" |
| #include <wtf/PrintStream.h> |
| |
| // CodeBlock hashes are useful for informally identifying code blocks. They correspond |
| // to the low 32 bits of a SHA1 hash of the source code with two low bit flipped |
| // according to the role that the code block serves (call, construct). Additionally, the |
| // hashes are typically operated over using a string in which the hash is transformed |
| // into a 6-byte alphanumeric representation. This can be retrieved by using |
| // toString(const CodeBlockHash&). Finally, we support CodeBlockHashes for native |
| // functions, in which case the hash is replaced by the function address. |
| |
| namespace JSC { |
| |
| class SourceCode; |
| |
| class CodeBlockHash { |
| public: |
| CodeBlockHash() |
| : m_hash(0) |
| { |
| } |
| |
| explicit CodeBlockHash(unsigned hash) |
| : m_hash(hash) |
| { |
| } |
| |
| CodeBlockHash(const SourceCode&, CodeSpecializationKind); |
| |
| explicit CodeBlockHash(const char*); |
| |
| unsigned hash() const { return m_hash; } |
| |
| void dump(PrintStream&) const; |
| |
| // Comparison methods useful for bisection. |
| bool operator==(const CodeBlockHash& other) const { return hash() == other.hash(); } |
| bool operator!=(const CodeBlockHash& other) const { return hash() != other.hash(); } |
| bool operator<(const CodeBlockHash& other) const { return hash() < other.hash(); } |
| bool operator>(const CodeBlockHash& other) const { return hash() > other.hash(); } |
| bool operator<=(const CodeBlockHash& other) const { return hash() <= other.hash(); } |
| bool operator>=(const CodeBlockHash& other) const { return hash() >= other.hash(); } |
| |
| private: |
| unsigned m_hash; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // CodeBlockHash_h |