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- /*
- * 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
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