//===-- LoopConvert/LoopConvert.cpp - C++11 for-loop migration ------------===//
//
//                     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 of the LoopConvertTransform
/// class.
///
//===----------------------------------------------------------------------===//

#include "LoopConvert.h"
#include "LoopActions.h"
#include "LoopMatchers.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Tooling/Refactoring.h"
#include "clang/Tooling/Tooling.h"

using clang::ast_matchers::MatchFinder;
using namespace clang::tooling;
using namespace clang;

int LoopConvertTransform::apply(const CompilationDatabase &Database,
                                const std::vector<std::string> &SourcePaths) {
  ClangTool LoopTool(Database, SourcePaths);

  unsigned AcceptedChanges = 0;
  unsigned DeferredChanges = 0;
  unsigned RejectedChanges = 0;

  TUInfo.reset(new TUTrackingInfo);

  MatchFinder Finder;
  LoopFixer ArrayLoopFixer(*TUInfo, &AcceptedChanges, &DeferredChanges,
                           &RejectedChanges, Options().MaxRiskLevel, LFK_Array,
                           /*Owner=*/ *this);
  Finder.addMatcher(makeArrayLoopMatcher(), &ArrayLoopFixer);
  LoopFixer IteratorLoopFixer(*TUInfo, &AcceptedChanges, &DeferredChanges,
                              &RejectedChanges, Options().MaxRiskLevel,
                              LFK_Iterator, /*Owner=*/ *this);
  Finder.addMatcher(makeIteratorLoopMatcher(), &IteratorLoopFixer);
  LoopFixer PseudoarrrayLoopFixer(*TUInfo, &AcceptedChanges, &DeferredChanges,
                                  &RejectedChanges, Options().MaxRiskLevel,
                                  LFK_PseudoArray, /*Owner=*/ *this);
  Finder.addMatcher(makePseudoArrayLoopMatcher(), &PseudoarrrayLoopFixer);

  if (int result = LoopTool.run(createActionFactory(Finder))) {
    llvm::errs() << "Error encountered during translation.\n";
    return result;
  }

  setAcceptedChanges(AcceptedChanges);
  setRejectedChanges(RejectedChanges);
  setDeferredChanges(DeferredChanges);

  return 0;
}

bool
LoopConvertTransform::handleBeginSource(clang::CompilerInstance &CI,
                                        llvm::StringRef Filename) {
  // Reset and initialize per-TU tracking structures.
  TUInfo->reset();

  return Transform::handleBeginSource(CI, Filename);
}

struct LoopConvertFactory : TransformFactory {
  LoopConvertFactory() {
    Since.Clang = Version(3, 0);
    Since.Gcc = Version(4, 6);
    Since.Icc = Version(13);
    Since.Msvc = Version(11);
  }

  Transform *createTransform(const TransformOptions &Opts) override {
    return new LoopConvertTransform(Opts);
  }
};

// Register the factory using this statically initialized variable.
static TransformFactoryRegistry::Add<LoopConvertFactory>
X("loop-convert", "Make use of range-based for loops where possible");

// This anchor is used to force the linker to link in the generated object file
// and thus register the factory.
volatile int LoopConvertTransformAnchorSource = 0;