kc3-lang/angle/src/compiler/UnfoldSelect.cpp

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• Hash : b587598c
  Author :
  Date : 2010-04-15T20:44:53
  

  Implemented short-circuiting behavior for the ternary operator
  TRAC #11444
  This is achieved by turning the ternary operator into conditional code.
  The UnfoldSelect intermediate code traverser places this conditional
  code before the statement containing the ternary operator (aka. select).
  The computed value is assigned to a temporary variable.
  On outputting the actual statement the ternary operator is
  replaced by the temporary variable.
  
  Signed-off-by: Andrew Lewycky
  Signed-off-by: Daniel Koch
  
  Author:    Nicolas Capens
  
  git-svn-id: https://angleproject.googlecode.com/svn/trunk@148 736b8ea6-26fd-11df-bfd4-992fa37f6226
  

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• src/compiler/UnfoldSelect.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 "UnfoldSelect.h"
  
  #include "OutputHLSL.h"
  #include "common/debug.h"
  #include "InfoSink.h"
  
  namespace sh
  {
  UnfoldSelect::UnfoldSelect(TParseContext &context, OutputHLSL *outputHLSL) : mContext(context), mOutputHLSL(outputHLSL)
  {
      mTemporaryIndex = 0;
  }
  
  void UnfoldSelect::traverse(TIntermNode *node)
  {
      mTemporaryIndex++;
      node->traverse(this);
  }
  
  bool UnfoldSelect::visitSelection(Visit visit, TIntermSelection *node)
  {
      TInfoSinkBase &out = mOutputHLSL->getBodyStream();
  
      if (node->usesTernaryOperator())
      {
          int i = mTemporaryIndex++;
  
          out << OutputHLSL::typeString(node->getType()) << " t" << i << ";\n";
  
          node->getCondition()->traverse(this);
          out << "if(";
          node->getCondition()->traverse(mOutputHLSL);
          out << ")\n"
                 "{\n";
          node->getTrueBlock()->traverse(this);
          out << "    t" << i << " = ";
          node->getTrueBlock()->traverse(mOutputHLSL);
          out << ";\n"
                 "}\n"
                 "else\n"
                 "{\n";
          node->getCondition()->traverse(this);
          out << "    t" << i << " = ";
          node->getFalseBlock()->traverse(mOutputHLSL);
          out << ";\n"
                 "}\n";
  
          mTemporaryIndex--;
      }
  
      return false;
  }
  
  int UnfoldSelect::getTemporaryIndex()
  {
      return mTemporaryIndex;
  }
  }
  

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