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

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• Author : Zhenyao Mo
  Date : 2016-11-09 15:49:51
  Hash : d7490967
  Message : Fix linkage.html failures on Mac. The failure is due to when we initialize variables to 0, we re-create the struct TType, and it contains a different unique id from the original struct TType, thus leading to a different hashed name. BUG=chromium:641129 TEST=webgl_conformance,webgl2_conformance Change-Id: I267b97fa496f55ea59dacee93af8f6a90f3e66cb Reviewed-on: https://chromium-review.googlesource.com/409602 Commit-Queue: Zhenyao Mo <zmo@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

• 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/SymbolTable.h"
  #include "compiler/translator/util.h"
  
  namespace sh
  {
  
  namespace
  {
  
  class VariableInitializer : public TIntermTraverser
  {
    public:
      VariableInitializer(const InitVariableList &vars, const TSymbolTable &symbolTable)
          : TIntermTraverser(true, false, false),
            mVariables(vars),
            mSymbolTable(symbolTable),
            mCodeInserted(false)
      {
          ASSERT(mSymbolTable.atGlobalLevel());
      }
  
    protected:
      bool visitBinary(Visit, TIntermBinary *node) override { return false; }
      bool visitUnary(Visit, TIntermUnary *node) override { return false; }
      bool visitIfElse(Visit, TIntermIfElse *node) override { return false; }
      bool visitLoop(Visit, TIntermLoop *node) override { return false; }
      bool visitBranch(Visit, TIntermBranch *node) override { return false; }
      bool visitAggregate(Visit, TIntermAggregate *node) override { return false; }
  
      bool visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node) override;
  
    private:
      void insertInitCode(TIntermSequence *sequence);
  
      const InitVariableList &mVariables;
      const TSymbolTable &mSymbolTable;
      bool mCodeInserted;
  };
  
  // VariableInitializer implementation.
  
  bool VariableInitializer::visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node)
  {
      // Function definition.
      ASSERT(visit == PreVisit);
      if (node->getFunctionSymbolInfo()->isMain())
      {
          TIntermBlock *body = node->getBody();
          insertInitCode(body->getSequence());
          mCodeInserted = true;
      }
      return false;
  }
  
  void VariableInitializer::insertInitCode(TIntermSequence *sequence)
  {
      for (const auto &var : mVariables)
      {
          TString name = TString(var.name.c_str());
  
          if (var.isArray())
          {
              // Assign the array elements one by one to keep the AST compatible with ESSL 1.00 which
              // doesn't have array assignment.
              size_t pos = name.find_last_of('[');
              if (pos != TString::npos)
              {
                  name = name.substr(0, pos);
              }
              TType elementType = sh::GetShaderVariableBasicType(var);
              TType arrayType   = elementType;
              arrayType.setArraySize(var.elementCount());
  
              for (unsigned int i = 0; i < var.arraySize; ++i)
              {
                  TIntermSymbol *arraySymbol = new TIntermSymbol(0, name, arrayType);
                  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 if (var.isStruct())
          {
              TVariable *structInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
              ASSERT(structInfo);
  
              TIntermSymbol *symbol = new TIntermSymbol(0, name, structInfo->getType());
              TIntermTyped *zero    = TIntermTyped::CreateZero(structInfo->getType());
  
              TIntermBinary *assign = new TIntermBinary(EOpAssign, symbol, zero);
              sequence->insert(sequence->begin(), assign);
          }
          else
          {
              TType type            = sh::GetShaderVariableBasicType(var);
              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,
                           const TSymbolTable &symbolTable)
  {
      VariableInitializer initializer(vars, symbolTable);
      root->traverse(&initializer);
  }
  
  }  // namespace sh