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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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