From e15dd966d523731101f70ccf768bba12435a0208 Mon Sep 17 00:00:00 2001 From: Lorry Tar Creator Date: Thu, 15 Oct 2015 09:45:50 +0000 Subject: webkitgtk-2.10.2 --- Source/JavaScriptCore/bytecode/CodeBlockHash.h | 81 ++++++++++++++++++++++++++ 1 file changed, 81 insertions(+) create mode 100644 Source/JavaScriptCore/bytecode/CodeBlockHash.h (limited to 'Source/JavaScriptCore/bytecode/CodeBlockHash.h') diff --git a/Source/JavaScriptCore/bytecode/CodeBlockHash.h b/Source/JavaScriptCore/bytecode/CodeBlockHash.h new file mode 100644 index 000000000..4e3398867 --- /dev/null +++ b/Source/JavaScriptCore/bytecode/CodeBlockHash.h @@ -0,0 +1,81 @@ +/* + * 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 + +// 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*); + + bool isSet() const { return !!m_hash; } + bool operator!() const { return !isSet(); } + + 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 -- cgit v1.2.1