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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_HYDROGEN_MARK_DEOPTIMIZE_H_
#define V8_HYDROGEN_MARK_DEOPTIMIZE_H_
#include "src/hydrogen.h"
namespace v8 {
namespace internal {
// Compute DeoptimizeOnUndefined flag for phis. Any phi that can reach a use
// with DeoptimizeOnUndefined set must have DeoptimizeOnUndefined set.
// Currently only HCompareNumericAndBranch, with double input representation,
// has this flag set. The flag is used by HChange tagged->double, which must
// deoptimize if one of its uses has this flag set.
class HMarkDeoptimizeOnUndefinedPhase : public HPhase {
public:
explicit HMarkDeoptimizeOnUndefinedPhase(HGraph* graph)
: HPhase("H_Mark deoptimize on undefined", graph),
worklist_(16, zone()) {}
void Run();
private:
void ProcessPhi(HPhi* phi);
// Preallocated worklist used as an optimization so we don't have
// to allocate a new ZoneList for every ProcessPhi() invocation.
ZoneList<HPhi*> worklist_;
DISALLOW_COPY_AND_ASSIGN(HMarkDeoptimizeOnUndefinedPhase);
};
class HComputeChangeUndefinedToNaN : public HPhase {
public:
explicit HComputeChangeUndefinedToNaN(HGraph* graph)
: HPhase("H_Compute change undefined to nan", graph) {}
void Run();
private:
DISALLOW_COPY_AND_ASSIGN(HComputeChangeUndefinedToNaN);
};
} } // namespace v8::internal
#endif // V8_HYDROGEN_MARK_DEOPTIMIZE_H_
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