text: //===-- Core/Transforms.cpp - class Transforms Impl -----------------------===//
  //
  //                     The LLVM Compiler Infrastructure
  //
  // This file is distributed under the University of Illinois Open Source
  // License. See LICENSE.TXT for details.
  //
  //===----------------------------------------------------------------------===//
  ///
  /// \file
  /// \brief This file provides the implementation for class Transforms.
  ///
  //===----------------------------------------------------------------------===//
  
  #include "Core/Transforms.h"
  #include "Core/Transform.h"
  
  namespace cl = llvm::cl;
  
  cl::OptionCategory TransformCategory("Transforms");
  
  Transforms::~Transforms() {
    for (std::vector<Transform *>::iterator I = ChosenTransforms.begin(),
                                            E = ChosenTransforms.end();
         I != E; ++I)
      delete *I;
  
    for (OptionMap::iterator I = Options.begin(), E = Options.end(); I != E; ++I)
      delete I->getValue();
  }
  
  void Transforms::registerTransforms() {
    for (TransformFactoryRegistry::iterator I = TransformFactoryRegistry::begin(),
                                            E = TransformFactoryRegistry::end();
         I != E; ++I)
      Options[I->getName()] = new cl::opt<bool>(
          I->getName(), cl::desc(I->getDesc()), cl::cat(TransformCategory));
  }
  
  bool Transforms::hasAnyExplicitOption() const {
    for (OptionMap::const_iterator I = Options.begin(), E = Options.end(); I != E;
         ++I)
      if (*I->second)
        return true;
    return false;
  }
  
  void
  Transforms::createSelectedTransforms(const TransformOptions &GlobalOptions,
                                       const CompilerVersions &RequiredVersions) {
    // if at least one transform is set explicitly on the command line, do not
    // enable non-explicit ones
    bool EnableAllTransformsByDefault = !hasAnyExplicitOption();
  
    for (TransformFactoryRegistry::iterator I = TransformFactoryRegistry::begin(),
                                            E = TransformFactoryRegistry::end();
         I != E; ++I) {
      bool ExplicitlyEnabled = *Options[I->getName()];
      bool OptionEnabled = EnableAllTransformsByDefault || ExplicitlyEnabled;
  
      if (!OptionEnabled)
        continue;
  
      std::unique_ptr<TransformFactory> Factory(I->instantiate());
      if (Factory->supportsCompilers(RequiredVersions))
        ChosenTransforms.push_back(Factory->createTransform(GlobalOptions));
      else if (ExplicitlyEnabled)
        llvm::errs() << "note: " << '-' << I->getName()
                     << ": transform not available for specified compilers\n";
    }
  }
  