1// Copyright 2013 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_HYDROGEN_MARK_DEOPTIMIZE_H_
6#define V8_HYDROGEN_MARK_DEOPTIMIZE_H_
7
8#include "src/hydrogen.h"
9
10namespace v8 {
11namespace internal {
12
13
14// Compute DeoptimizeOnUndefined flag for phis.  Any phi that can reach a use
15// with DeoptimizeOnUndefined set must have DeoptimizeOnUndefined set.
16// Currently only HCompareNumericAndBranch, with double input representation,
17// has this flag set.  The flag is used by HChange tagged->double, which must
18// deoptimize if one of its uses has this flag set.
19class HMarkDeoptimizeOnUndefinedPhase : public HPhase {
20 public:
21  explicit HMarkDeoptimizeOnUndefinedPhase(HGraph* graph)
22      : HPhase("H_Mark deoptimize on undefined", graph),
23        worklist_(16, zone()) {}
24
25  void Run();
26
27 private:
28  void ProcessPhi(HPhi* phi);
29
30  // Preallocated worklist used as an optimization so we don't have
31  // to allocate a new ZoneList for every ProcessPhi() invocation.
32  ZoneList<HPhi*> worklist_;
33
34  DISALLOW_COPY_AND_ASSIGN(HMarkDeoptimizeOnUndefinedPhase);
35};
36
37
38class HComputeChangeUndefinedToNaN : public HPhase {
39 public:
40  explicit HComputeChangeUndefinedToNaN(HGraph* graph)
41      : HPhase("H_Compute change undefined to nan", graph) {}
42
43  void Run();
44
45 private:
46  DISALLOW_COPY_AND_ASSIGN(HComputeChangeUndefinedToNaN);
47};
48
49
50} }  // namespace v8::internal
51
52#endif  // V8_HYDROGEN_MARK_DEOPTIMIZE_H_
53