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

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• Hash : cccf2b00
  Author :
  Date : 2017-07-05T14:50:54
  

  Reorganize AST traversal utility code
  
  Define TIntermTraverser and TIntermLValueTrackingTraverser in a
  separate header file. hash() function is moved out from
  TIntermTraverser as it is not related to the core functionality
  of traversing and transforming ASTs.
  
  Also reorganize some traversers to follow common conventions:
  
  - Intermediate output is now in OutputTree.h/.cpp
  - Max tree depth check is now in IsASTDepthBelowLimit.h/.cpp
  
  BUG=angleproject:1490
  TEST=angle_unittests
  
  Change-Id: Id4968aa9d4e24d0c5bac90dc147fc9f310de0184
  Reviewed-on: https://chromium-review.googlesource.com/559531
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/translator/AddAndTrueToLoopCondition.cpp

• //
  // Copyright (c) 2016 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/AddAndTrueToLoopCondition.h"
  
  #include "compiler/translator/IntermTraverse.h"
  
  namespace sh
  {
  
  namespace
  {
  
  // An AST traverser that rewrites for and while loops by replacing "condition" with
  // "condition && true" to work around condition bug on Intel Mac.
  class AddAndTrueToLoopConditionTraverser : public TIntermTraverser
  {
    public:
      AddAndTrueToLoopConditionTraverser() : TIntermTraverser(true, false, false) {}
  
      bool visitLoop(Visit, TIntermLoop *loop) override
      {
          // do-while loop doesn't have this bug.
          if (loop->getType() != ELoopFor && loop->getType() != ELoopWhile)
          {
              return true;
          }
  
          // For loop may not have a condition.
          if (loop->getCondition() == nullptr)
          {
              return true;
          }
  
          // Constant true.
          TConstantUnion *trueConstant = new TConstantUnion();
          trueConstant->setBConst(true);
          TIntermTyped *trueValue = new TIntermConstantUnion(trueConstant, TType(EbtBool));
  
          // CONDITION && true.
          TIntermBinary *andOp = new TIntermBinary(EOpLogicalAnd, loop->getCondition(), trueValue);
          loop->setCondition(andOp);
  
          return true;
      }
  };
  
  }  // anonymous namespace
  
  void AddAndTrueToLoopCondition(TIntermNode *root)
  {
      AddAndTrueToLoopConditionTraverser traverser;
      root->traverse(&traverser);
  }
  
  }  // namespace sh
  

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