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

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• Author : zmo@google.com
  Date : 2011-09-27 21:26:19
  Hash : 46974d29
  Message : Fix memory corruption in ANGLE shader translator. The bug is that within each compilation cycle, all the memory allocated through T* types are freed to be reused. So if certain information is meant to outlive the cycle, it should use the std type instead of the T* type: 1) emulated function vector 2) mapped long names map BUG=none TEST=webgl conformance test conformance/glsl/glsl-feature-mod-gentype.html does not crash in Win Debug. Review URL: http://codereview.appspot.com/5137047 git-svn-id: https://angleproject.googlecode.com/svn/trunk@773 736b8ea6-26fd-11df-bfd4-992fa37f6226

• src/compiler/MapLongVariableNames.cpp

• //
  // Copyright (c) 2002-2011 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/MapLongVariableNames.h"
  
  namespace {
  
  TString mapLongName(int id, const TString& name, bool isVarying)
  {
      ASSERT(name.size() > MAX_IDENTIFIER_NAME_SIZE);
      TStringStream stream;
      stream << "webgl_";
      if (isVarying)
          stream << "v";
      stream << id << "_";
      stream << name.substr(0, MAX_IDENTIFIER_NAME_SIZE - stream.str().size());
      return stream.str();
  }
  
  }  // anonymous namespace
  
  MapLongVariableNames::MapLongVariableNames(
      std::map<std::string, std::string>& varyingLongNameMap)
      : mVaryingLongNameMap(varyingLongNameMap)
  {
  }
  
  void MapLongVariableNames::visitSymbol(TIntermSymbol* symbol)
  {
      ASSERT(symbol != NULL);
      if (symbol->getSymbol().size() > MAX_IDENTIFIER_NAME_SIZE) {
          switch (symbol->getQualifier()) {
            case EvqVaryingIn:
            case EvqVaryingOut:
            case EvqInvariantVaryingIn:
            case EvqInvariantVaryingOut:
              symbol->setSymbol(
                  mapVaryingLongName(symbol->getSymbol()));
              break;
            default:
              symbol->setSymbol(
                  mapLongName(symbol->getId(), symbol->getSymbol(), false));
              break;
          };
      }
  }
  
  bool MapLongVariableNames::visitLoop(Visit, TIntermLoop* node)
  {
      if (node->getInit())
          node->getInit()->traverse(this);
      return true;
  }
  
  TString MapLongVariableNames::mapVaryingLongName(const TString& name)
  {
      std::map<std::string, std::string>::const_iterator it = mVaryingLongNameMap.find(name.c_str());
      if (it != mVaryingLongNameMap.end())
          return (*it).second.c_str();
  
      int id = mVaryingLongNameMap.size();
      TString mappedName = mapLongName(id, name, true);
      mVaryingLongNameMap.insert(
          std::map<std::string, std::string>::value_type(name.c_str(), mappedName.c_str()));
      return mappedName;
  }