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/*
* Copyright (C) 2013 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;
// 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; }
private:
bool m_valid;
};
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
#endif // DFGAnalysis_h