dfg/DFGAtTailAbstractState.h

   1 /*
   2  * Copyright (C) 2013 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
   6  * are met:
   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
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef DFGAtTailAbstractState_h
  27 #define DFGAtTailAbstractState_h
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include "DFGAbstractValue.h"
  32 #include "DFGBasicBlock.h"
  33 #include "DFGGraph.h"
  34
  35 namespace JSC { namespace DFG {
  36
  37 class AtTailAbstractState {
  38 public:
  39     AtTailAbstractState();
  40
  41     ~AtTailAbstractState();
  42
  43     void initializeTo(BasicBlock* block)
  44     {
  45         m_block = block;
  46     }
  47
  48     void createValueForNode(Node*);
  49     AbstractValue& forNode(Node*);
  50     AbstractValue& forNode(Edge edge) { return forNode(edge.node()); }
  51     Operands<AbstractValue>& variables() { return m_block->valuesAtTail; }
  52
  53     BasicBlock* block() const { return m_block; }
  54
  55     bool isValid() { return m_block->cfaDidFinish; }
  56
  57     void setDidClobber(bool) { }
  58     void setIsValid(bool isValid) { m_block->cfaDidFinish = isValid; }
  59     void setBranchDirection(BranchDirection) { }
  60     void setFoundConstants(bool) { }
  61     bool haveStructures() const { return true; } // It's always safe to return true.
  62     void setHaveStructures(bool) { }
  63
  64 private:
  65     BasicBlock* m_block;
  66 };
  67
  68 } } // namespace JSC::DFG
  69
  70 #endif // ENABLE(DFG_JIT)
  71
  72 #endif // DFGAtTailAbstractState_h
  73