dfg/DFGCFGSimplificationPhase.h

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
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   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef DFGCFGSimplificationPhase_h
  27 #define DFGCFGSimplificationPhase_h
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 namespace JSC { namespace DFG {
  32
  33 class Graph;
  34
  35 // CFG simplification:
  36 //
  37 // jump to single predecessor -> merge blocks
  38 // branch on constant -> jump
  39 // branch to same blocks -> jump
  40 // jump-only block -> remove
  41 // kill dead code
  42
  43 bool performCFGSimplification(Graph&);
  44
  45 } } // namespace JSC::DFG
  46
  47 #endif // ENABLE(DFG_JIT)
  48
  49 #endif // DFGCFGSimplificationPhase_h
  50