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/*
* Copyright (C) 2014, 2015 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.
*/
#include "config.h"
#include "DFGCleanUpPhase.h"
#if ENABLE(DFG_JIT)
#include "DFGGraph.h"
#include "DFGPhase.h"
#include "JSCJSValueInlines.h"
namespace JSC { namespace DFG {
class CleanUpPhase : public Phase {
public:
CleanUpPhase(Graph& graph)
: Phase(graph, "clean up")
{
}
bool run()
{
bool changed = false;
for (BasicBlock* block : m_graph.blocksInNaturalOrder()) {
unsigned sourceIndex = 0;
unsigned targetIndex = 0;
while (sourceIndex < block->size()) {
Node* node = block->at(sourceIndex++);
bool kill = false;
if (node->op() == Check)
node->children = node->children.justChecks();
switch (node->op()) {
case Phantom:
case Check:
if (node->children.isEmpty())
kill = true;
break;
case CheckVarargs:
kill = true;
m_graph.doToChildren(node, [&] (Edge edge) {
kill &= !edge;
});
break;
default:
break;
}
if (kill)
m_graph.deleteNode(node);
else
block->at(targetIndex++) = node;
}
block->resize(targetIndex);
}
return changed;
}
};
bool performCleanUp(Graph& graph)
{
return runPhase<CleanUpPhase>(graph);
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)