Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame^] | 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: |
| 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_CRANKSHAFT_HYDROGEN_MARK_DEOPTIMIZE_H_ |