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

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• Hash : 3272a6d3
  Author :
  Date : 2016-08-29T17:54:50
  

  Promote and fold indexing nodes similarly to other binary ops
  
  Indexing nodes now get their type set in TIntermBinary::promote, same
  as math and logic ops. They are also constant folded through
  TIntermBinary::fold() instead of having special functions for constant
  folding them in ParseContext.
  
  Index nodes for struct and interface block member access now always
  have integer type, instead of sometimes having the type of the field
  they were used to access.
  
  Usage of TIntermBinary constructor is cleaned up so only the
  constructor that takes in left and right operands is used. The type
  of TIntermBinary nodes is always determined automatically.
  
  Together these changes make the code considerably cleaner.
  
  Note that the code for constant folding for array indexing is actually
  never hit because constant folding array constructors is still
  intentionally disabled in the code.
  
  BUG=angleproject:1490
  TEST=angle_unittests
  
  Change-Id: Ifcec45257476cdb0d495c7d72e3cf2f83388e8c5
  Reviewed-on: https://chromium-review.googlesource.com/377961
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  

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• src/compiler/translator/InitializeVariables.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/InitializeVariables.h"
  
  #include "angle_gl.h"
  #include "common/debug.h"
  #include "compiler/translator/IntermNode.h"
  #include "compiler/translator/util.h"
  
  namespace
  {
  
  class VariableInitializer : public TIntermTraverser
  {
    public:
      VariableInitializer(const InitVariableList &vars)
          : TIntermTraverser(true, false, false), mVariables(vars), mCodeInserted(false)
      {
      }
  
    protected:
      bool visitBinary(Visit, TIntermBinary *node) override { return false; }
      bool visitUnary(Visit, TIntermUnary *node) override { return false; }
      bool visitSelection(Visit, TIntermSelection *node) override { return false; }
      bool visitLoop(Visit, TIntermLoop *node) override { return false; }
      bool visitBranch(Visit, TIntermBranch *node) override { return false; }
  
      bool visitAggregate(Visit visit, TIntermAggregate *node) override;
  
    private:
      void insertInitCode(TIntermSequence *sequence);
  
      const InitVariableList &mVariables;
      bool mCodeInserted;
  };
  
  // VariableInitializer implementation.
  
  bool VariableInitializer::visitAggregate(Visit visit, TIntermAggregate *node)
  {
      bool visitChildren = !mCodeInserted;
      switch (node->getOp())
      {
        case EOpSequence:
          break;
        case EOpFunction:
        {
          // Function definition.
          ASSERT(visit == PreVisit);
          if (node->getName() == "main(")
          {
              TIntermSequence *sequence = node->getSequence();
              ASSERT((sequence->size() == 1) || (sequence->size() == 2));
              TIntermAggregate *body = NULL;
              if (sequence->size() == 1)
              {
                  body = new TIntermAggregate(EOpSequence);
                  sequence->push_back(body);
              }
              else
              {
                  body = (*sequence)[1]->getAsAggregate();
              }
              ASSERT(body);
              insertInitCode(body->getSequence());
              mCodeInserted = true;
          }
          break;
        }
        default:
          visitChildren = false;
          break;
      }
      return visitChildren;
  }
  
  void VariableInitializer::insertInitCode(TIntermSequence *sequence)
  {
      for (const auto &var : mVariables)
      {
          TString name = TString(var.name.c_str());
          TType type   = sh::GetShaderVariableType(var);
  
          // Assign the array elements one by one to keep the AST compatible with ESSL 1.00 which
          // doesn't have array assignment.
          if (var.isArray())
          {
              size_t pos = name.find_last_of('[');
              if (pos != TString::npos)
              {
                  name = name.substr(0, pos);
              }
              TType elementType = type;
              elementType.clearArrayness();
  
              for (unsigned int i = 0; i < var.arraySize; ++i)
              {
                  TIntermSymbol *arraySymbol = new TIntermSymbol(0, name, type);
                  TIntermBinary *element     = new TIntermBinary(EOpIndexDirect, arraySymbol,
                                                             TIntermTyped::CreateIndexNode(i));
  
                  TIntermTyped *zero        = TIntermTyped::CreateZero(elementType);
                  TIntermBinary *assignment = new TIntermBinary(EOpAssign, element, zero);
  
                  sequence->insert(sequence->begin(), assignment);
              }
          }
          else
          {
              TIntermSymbol *symbol = new TIntermSymbol(0, name, type);
              TIntermTyped *zero    = TIntermTyped::CreateZero(type);
  
              TIntermBinary *assign = new TIntermBinary(EOpAssign, symbol, zero);
              sequence->insert(sequence->begin(), assign);
          }
      }
  }
  
  }  // namespace anonymous
  
  void InitializeVariables(TIntermNode *root, const InitVariableList &vars)
  {
      VariableInitializer initializer(vars);
      root->traverse(&initializer);
  }
  

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