mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
/*
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* Copyright (C) 2012 Apple Inc. All rights reserved.
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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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#pragma once
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#include "CodeSpecializationKind.h"
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#include <wtf/PrintStream.h>
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// CodeBlock hashes are useful for informally identifying code blocks. They correspond
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// to the low 32 bits of a SHA1 hash of the source code with two low bit flipped
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// according to the role that the code block serves (call, construct). Additionally, the
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// hashes are typically operated over using a string in which the hash is transformed
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// into a 6-byte alphanumeric representation. This can be retrieved by using
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// toString(const CodeBlockHash&). Finally, we support CodeBlockHashes for native
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// functions, in which case the hash is replaced by the function address.
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namespace JSC {
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class SourceCode;
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class CodeBlockHash {
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public:
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CodeBlockHash()
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: m_hash(0)
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{
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}
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explicit CodeBlockHash(unsigned hash)
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: m_hash(hash)
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{
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}
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CodeBlockHash(const SourceCode&, CodeSpecializationKind);
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explicit CodeBlockHash(const char*);
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bool isSet() const { return !!m_hash; }
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bool operator!() const { return !isSet(); }
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unsigned hash() const { return m_hash; }
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void dump(PrintStream&) const;
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// Comparison methods useful for bisection.
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bool operator==(const CodeBlockHash& other) const { return hash() == other.hash(); }
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bool operator!=(const CodeBlockHash& other) const { return hash() != other.hash(); }
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bool operator<(const CodeBlockHash& other) const { return hash() < other.hash(); }
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bool operator>(const CodeBlockHash& other) const { return hash() > other.hash(); }
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bool operator<=(const CodeBlockHash& other) const { return hash() <= other.hash(); }
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bool operator>=(const CodeBlockHash& other) const { return hash() >= other.hash(); }
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private:
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unsigned m_hash;
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};
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} // namespace JSC
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