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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_CHECK_ELIMINATION_H_
     29 #define V8_HYDROGEN_CHECK_ELIMINATION_H_
     30 
     31 #include "hydrogen.h"
     32 #include "hydrogen-alias-analysis.h"
     33 
     34 namespace v8 {
     35 namespace internal {
     36 
     37 
     38 // Remove CheckMaps instructions through flow- and branch-sensitive analysis.
     39 class HCheckEliminationPhase : public HPhase {
     40  public:
     41   explicit HCheckEliminationPhase(HGraph* graph)
     42       : HPhase("H_Check Elimination", graph), aliasing_() {
     43 #ifdef DEBUG
     44     redundant_ = 0;
     45     removed_ = 0;
     46     removed_cho_ = 0;
     47     narrowed_ = 0;
     48     loads_ = 0;
     49     empty_ = 0;
     50     compares_true_ = 0;
     51     compares_false_ = 0;
     52     transitions_ = 0;
     53 #endif
     54   }
     55 
     56   void Run();
     57 
     58   friend class HCheckTable;
     59 
     60  private:
     61   void PrintStats();
     62 
     63   HAliasAnalyzer* aliasing_;
     64 #ifdef DEBUG
     65   int redundant_;
     66   int removed_;
     67   int removed_cho_;
     68   int narrowed_;
     69   int loads_;
     70   int empty_;
     71   int compares_true_;
     72   int compares_false_;
     73   int transitions_;
     74 #endif
     75 };
     76 
     77 
     78 } }  // namespace v8::internal
     79 
     80 #endif  // V8_HYDROGEN_CHECK_ELIMINATION_H_
     81