kc3-lang/angle/Compiler/QualifierAlive.cpp

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• Hash : 4f39fd99
  Author :
  Date : 2010-03-08T20:26:45
  

  Initial import from TransGaming
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@2 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• Compiler/QualifierAlive.cpp

• //
  // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "intermediate.h"
  
  class TAliveTraverser : public TIntermTraverser {
  public:
      TAliveTraverser(TQualifier q) : TIntermTraverser(true, false, false, true), found(false), qualifier(q)
      {
      }
  
  	bool wasFound() { return found; }
  
  protected:
      bool found;
      TQualifier qualifier;
  
      void visitSymbol(TIntermSymbol*);
      bool visitSelection(Visit, TIntermSelection*);
  };
  
  //
  // Report whether or not a variable of the given qualifier type
  // is guaranteed written.  Not always possible to determine if
  // it is written conditionally.
  //
  // ?? It does not do this well yet, this is just a place holder
  // that simply determines if it was reference at all, anywhere.
  //
  bool QualifierWritten(TIntermNode* node, TQualifier qualifier)
  {
      TAliveTraverser it(qualifier);
  
      if (node)
          node->traverse(&it);
  
      return it.wasFound();
  }
  
  void TAliveTraverser::visitSymbol(TIntermSymbol* node)
  {
      //
      // If it's what we're looking for, record it.
      //
      if (node->getQualifier() == qualifier)
          found = true;
  }
  
  bool TAliveTraverser::visitSelection(Visit preVisit, TIntermSelection* node)
  {
      if (wasFound())
          return false;
  
      return true;
  }
  

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