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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 class HComputeChangeUndefinedToNaN : public HPhase {
     62  public:
     63   explicit HComputeChangeUndefinedToNaN(HGraph* graph)
     64       : HPhase("H_Compute change undefined to nan", graph) {}
     65 
     66   void Run();
     67 
     68  private:
     69   DISALLOW_COPY_AND_ASSIGN(HComputeChangeUndefinedToNaN);
     70 };
     71 
     72 
     73 } }  // namespace v8::internal
     74 
     75 #endif  // V8_HYDROGEN_MARK_DEOPTIMIZE_H_
     76