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1 // Copyright 2013 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #ifndef V8_HYDROGEN_MARK_DEOPTIMIZE_H_ | |
29 #define V8_HYDROGEN_MARK_DEOPTIMIZE_H_ | |
30 | |
31 #include "hydrogen.h" | |
32 | |
33 namespace v8 { | |
34 namespace internal { | |
35 | |
36 | |
37 // Compute DeoptimizeOnUndefined flag for phis. Any phi that can reach a use | |
38 // with DeoptimizeOnUndefined set must have DeoptimizeOnUndefined set. | |
39 // Currently only HCompareNumericAndBranch, with double input representation, | |
40 // has this flag set. The flag is used by HChange tagged->double, which must | |
41 // deoptimize if one of its uses has this flag set. | |
42 class HMarkDeoptimizeOnUndefinedPhase : public HPhase { | |
43 public: | |
44 explicit HMarkDeoptimizeOnUndefinedPhase(HGraph* graph) | |
45 : HPhase("H_Mark deoptimize on undefined", graph), | |
46 worklist_(16, zone()) {} | |
47 | |
48 void Run(); | |
49 | |
50 private: | |
51 void ProcessPhi(HPhi* phi); | |
52 | |
53 // Preallocated worklist used as an optimization so we don't have | |
54 // to allocate a new ZoneList for every ProcessPhi() invocation. | |
55 ZoneList<HPhi*> worklist_; | |
56 | |
57 DISALLOW_COPY_AND_ASSIGN(HMarkDeoptimizeOnUndefinedPhase); | |
58 }; | |
59 | |
60 | |
61 } } // namespace v8::internal | |
62 | |
63 #endif // V8_HYDROGEN_MARK_DEOPTIMIZE_H_ | |
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