/* * 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 <wtf/NotFound.h> 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, bool wasSeenInJIT) : m_state(state) , m_structureSet(structureSet) , m_offset(offset) , m_wasSeenInJIT(wasSeenInJIT) { 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; } bool wasSeenInJIT() const { return m_wasSeenInJIT; } private: static GetByIdStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex, Identifier&); State m_state; StructureSet m_structureSet; size_t m_offset; bool m_wasSeenInJIT; }; } // namespace JSC #endif // PropertyAccessStatus_h