/* * Copyright (C) 2013, 2014 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 DFGAnalysis_h #define DFGAnalysis_h #if ENABLE(DFG_JIT) namespace JSC { namespace DFG { class Graph; // Use this as a mixin for DFG analyses. The analysis itself implements a public // compute(Graph&) method. Clients call computeIfNecessary() when they want // results. template<typename T> class Analysis { public: Analysis() : m_valid(false) { } void invalidate() { m_valid = false; } void computeIfNecessary(Graph& graph) { if (m_valid) return; // It's best to run dependent analyses from this method. static_cast<T*>(this)->computeDependencies(graph); // Set to true early, since the analysis may choose to call its own methods in // compute() and it may want to ASSERT() validity in those methods. m_valid = true; static_cast<T*>(this)->compute(graph); } bool isValid() const { return m_valid; } // Override this to compute any dependent analyses. See // NaturalLoops::computeDependencies(Graph&) for an example. This isn't strictly necessary but // it makes debug dumps in cases of error work a bit better because this analysis wouldn't yet // be pretending to be valid. void computeDependencies(Graph&) { } private: bool m_valid; }; } } // namespace JSC::DFG #endif // ENABLE(DFG_JIT) #endif // DFGAnalysis_h