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

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• Hash : d0bad2c7
  Author :
  Date : 2016-09-09T18:01:16
  

  Split ternary node class from TIntermSelection
  
  Ternary operator nodes are typed parts of expressions, they always
  have two children and the children are also guaranteed to be
  TIntermTyped. "If" selection nodes can't be a part of an expression,
  they can have either one or two children and the children are code
  blocks. Due to all of these differences it makes sense to store these
  using two different AST node classes.
  
  BUG=angleproject:1490
  TEST=angle_unittests
  
  Change-Id: I913ab1d806e3cdb5c21106f078cc9c0b6c72ac54
  Reviewed-on: https://chromium-review.googlesource.com/384512
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  

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• src/compiler/translator/UnfoldShortCircuitAST.cpp

• //
  // Copyright (c) 2002-2013 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/UnfoldShortCircuitAST.h"
  
  namespace
  {
  
  // "x || y" is equivalent to "x ? true : y".
  TIntermTernary *UnfoldOR(TIntermTyped *x, TIntermTyped *y)
  {
      TConstantUnion *u = new TConstantUnion;
      u->setBConst(true);
      TIntermConstantUnion *trueNode = new TIntermConstantUnion(
          u, TType(EbtBool, EbpUndefined, EvqConst, 1));
      return new TIntermTernary(x, trueNode, y);
  }
  
  // "x && y" is equivalent to "x ? y : false".
  TIntermTernary *UnfoldAND(TIntermTyped *x, TIntermTyped *y)
  {
      TConstantUnion *u = new TConstantUnion;
      u->setBConst(false);
      TIntermConstantUnion *falseNode = new TIntermConstantUnion(
          u, TType(EbtBool, EbpUndefined, EvqConst, 1));
      return new TIntermTernary(x, y, falseNode);
  }
  
  }  // namespace anonymous
  
  bool UnfoldShortCircuitAST::visitBinary(Visit visit, TIntermBinary *node)
  {
      TIntermTernary *replacement = nullptr;
  
      switch (node->getOp())
      {
        case EOpLogicalOr:
          replacement = UnfoldOR(node->getLeft(), node->getRight());
          break;
        case EOpLogicalAnd:
          replacement = UnfoldAND(node->getLeft(), node->getRight());
          break;
        default:
          break;
      }
      if (replacement)
      {
          queueReplacement(node, replacement, OriginalNode::IS_DROPPED);
      }
      return true;
  }
  

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