From 32ea33253afbbdefd2680aa95ab5f57455272ae7 Mon Sep 17 00:00:00 2001 From: Simon Hausmann Date: Fri, 30 Nov 2012 16:58:06 +0100 Subject: Imported WebKit commit 6a4a1d32e1d779548c726c4826cba9d69eb87601 (http://svn.webkit.org/repository/webkit/trunk@136242) Final import for the Qt 5.x series that implements the QtWebKit / QtWebKitWidgets split Extra fixes will be cherry-picked. Change-Id: I844f1ebb99c6d6b75db31d6538c2acd628e79681 Reviewed-by: Simon Hausmann --- Source/JavaScriptCore/bytecode/CodeBlockHash.h | 78 ++++++++++++++++++++++++++ 1 file changed, 78 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..20de8ed48 --- /dev/null +++ b/Source/JavaScriptCore/bytecode/CodeBlockHash.h @@ -0,0 +1,78 @@ +/* + * 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*); + + 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