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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 | |
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: | |
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: | |
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_HYDROGEN_MARK_DEOPTIMIZE_H_ | |
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