From cd44dc59cdfc39534aef4d417e9f3c412e3be139 Mon Sep 17 00:00:00 2001 From: Simon Hausmann Date: Fri, 3 Feb 2012 09:55:33 +0100 Subject: Imported WebKit commit fce473cb4d55aa9fe9d0b0322a2fffecb731b961 (http://svn.webkit.org/repository/webkit/trunk@106560) --- Source/JavaScriptCore/bytecode/GetByIdStatus.h | 82 ++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 Source/JavaScriptCore/bytecode/GetByIdStatus.h (limited to 'Source/JavaScriptCore/bytecode/GetByIdStatus.h') diff --git a/Source/JavaScriptCore/bytecode/GetByIdStatus.h b/Source/JavaScriptCore/bytecode/GetByIdStatus.h new file mode 100644 index 000000000..00e50e76d --- /dev/null +++ b/Source/JavaScriptCore/bytecode/GetByIdStatus.h @@ -0,0 +1,82 @@ +/* + * 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 GetByIdStatus_h +#define GetByIdStatus_h + +#include "StructureSet.h" +#include + +namespace JSC { + +class CodeBlock; +class Identifier; + +class GetByIdStatus { +public: + enum State { + NoInformation, // It's uncached so we have no information. + SimpleDirect, // It's cached for a direct access to a known object property. + TakesSlowPath, // It's known to often take slow path. + MakesCalls // It's known to take paths that make calls. + }; + + GetByIdStatus() + : m_state(NoInformation) + , m_offset(notFound) + { + } + + GetByIdStatus(State state, const StructureSet& structureSet, size_t offset) + : m_state(state) + , m_structureSet(structureSet) + , m_offset(offset) + { + ASSERT((state == SimpleDirect) == (offset != notFound)); + } + + static GetByIdStatus computeFor(CodeBlock*, unsigned bytecodeIndex, Identifier&); + + State state() const { return m_state; } + + bool isSet() const { return m_state != NoInformation; } + bool operator!() const { return !isSet(); } + bool isSimpleDirect() const { return m_state == SimpleDirect; } + bool takesSlowPath() const { return m_state == TakesSlowPath || m_state == MakesCalls; } + bool makesCalls() const { return m_state == MakesCalls; } + + const StructureSet& structureSet() const { return m_structureSet; } + size_t offset() const { return m_offset; } + +private: + State m_state; + StructureSet m_structureSet; + size_t m_offset; +}; + +} // namespace JSC + +#endif // PropertyAccessStatus_h + -- cgit v1.2.1