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_CRANKSHAFT_HYDROGEN_MARK_DEOPTIMIZE_H_
6 #define V8_CRANKSHAFT_HYDROGEN_MARK_DEOPTIMIZE_H_
7 
8 #include "src/crankshaft/hydrogen.h"
9 
10 namespace v8 {
11 namespace 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.
19 class HMarkDeoptimizeOnUndefinedPhase : public HPhase {
20  public:
HMarkDeoptimizeOnUndefinedPhase(HGraph * graph)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 
38 class HComputeChangeUndefinedToNaN : public HPhase {
39  public:
HComputeChangeUndefinedToNaN(HGraph * graph)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 internal
51 }  // namespace v8
52 
53 #endif  // V8_CRANKSHAFT_HYDROGEN_MARK_DEOPTIMIZE_H_
54