kc3-lang/angle/src/compiler/translator/QualifierAlive.cpp

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• Hash : 3ae6465f
  Author :
  Date : 2015-01-26T15:51:39
  

  Fix lots of variable shadowing in ANGLE
  
  BUG=angle:877
  
  Change-Id: I3df0fffb19f5ecbe439fbc2a8d6d239a5dc6b638
  Reviewed-on: https://chromium-review.googlesource.com/243334
  Tested-by: Austin Kinross <aukinros@microsoft.com>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/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 "compiler/translator/IntermNode.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, TIntermSelection*)
  {
      if (wasFound())
          return false;
  
      return true;
  }
  

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