FrontendActions.cpp

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//===--- FrontendActions.cpp ----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "clang/Rewrite/Frontend/FrontendActions.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/Basic/CharInfo.h"
#include "clang/Basic/LangStandard.h"
#include "clang/Config/config.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Frontend/FrontendDiagnostic.h"
#include "clang/Frontend/Utils.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Rewrite/Frontend/ASTConsumers.h"
#include "clang/Rewrite/Frontend/FixItRewriter.h"
#include "clang/Rewrite/Frontend/Rewriters.h"
#include "clang/Serialization/ASTReader.h"
#include "clang/Serialization/ModuleFile.h"
#include "clang/Serialization/ModuleManager.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/Support/CrashRecoveryContext.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <memory>
#include <utility>
 
using namespace clang;
 
//===----------------------------------------------------------------------===//
// AST Consumer Actions
//===----------------------------------------------------------------------===//
 
std::unique_ptr<ASTConsumer>
HTMLPrintAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
  if (std::unique_ptr<raw_ostream> OS =
          CI.createDefaultOutputFile(false, InFile))
    return CreateHTMLPrinter(std::move(OS), CI.getPreprocessor());
  return nullptr;
}
 
FixItAction::FixItAction() {}
FixItAction::~FixItAction() {}
 
std::unique_ptr<ASTConsumer>
FixItAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
  return std::make_unique<ASTConsumer>();
}
 
namespace {
class FixItRewriteInPlace : public FixItOptions {
public:
  FixItRewriteInPlace() { InPlace = true; }
 
  std::string RewriteFilename(const std::string &Filename, int &fd) override {
    llvm_unreachable("don't call RewriteFilename for inplace rewrites");
  }
};
 
class FixItActionSuffixInserter : public FixItOptions {
  std::string NewSuffix;
 
public:
  FixItActionSuffixInserter(std::string NewSuffix, bool FixWhatYouCan)
      : NewSuffix(std::move(NewSuffix)) {
    this->FixWhatYouCan = FixWhatYouCan;
  }
 
  std::string RewriteFilename(const std::string &Filename, int &fd) override {
    fd = -1;
    SmallString<128> Path(Filename);
    llvm::sys::path::replace_extension(Path,
      NewSuffix + llvm::sys::path::extension(Path));
    return std::string(Path);
  }
};
 
class FixItRewriteToTemp : public FixItOptions {
public:
  std::string RewriteFilename(const std::string &Filename, int &fd) override {
    SmallString<128> Path;
    llvm::sys::fs::createTemporaryFile(llvm::sys::path::filename(Filename),
                                       llvm::sys::path::extension(Filename).drop_front(), fd,
                                       Path);
    return std::string(Path);
  }
};
} // end anonymous namespace
 
bool FixItAction::BeginSourceFileAction(CompilerInstance &CI) {
  const FrontendOptions &FEOpts = getCompilerInstance().getFrontendOpts();
  if (!FEOpts.FixItSuffix.empty()) {
    FixItOpts.reset(new FixItActionSuffixInserter(FEOpts.FixItSuffix,
                                                  FEOpts.FixWhatYouCan));
  } else {
    FixItOpts.reset(new FixItRewriteInPlace);
    FixItOpts->FixWhatYouCan = FEOpts.FixWhatYouCan;
  }
  Rewriter.reset(new FixItRewriter(CI.getDiagnostics(), CI.getSourceManager(),
                                   CI.getLangOpts(), FixItOpts.get()));
  return true;
}
 
void FixItAction::EndSourceFileAction() {
  // Otherwise rewrite all files.
  Rewriter->WriteFixedFiles();
}
 
bool FixItRecompile::BeginInvocation(CompilerInstance &CI) {
 
  std::vector<std::pair<std::string, std::string> > RewrittenFiles;
  bool err = false;
  {
    const FrontendOptions &FEOpts = CI.getFrontendOpts();
    std::unique_ptr<FrontendAction> FixAction(new SyntaxOnlyAction());
    if (FixAction->BeginSourceFile(CI, FEOpts.Inputs[0])) {
      std::unique_ptr<FixItOptions> FixItOpts;
      if (FEOpts.FixToTemporaries)
        FixItOpts.reset(new FixItRewriteToTemp());
      else
        FixItOpts.reset(new FixItRewriteInPlace());
      FixItOpts->Silent = true;
      FixItOpts->FixWhatYouCan = FEOpts.FixWhatYouCan;
      FixItOpts->FixOnlyWarnings = FEOpts.FixOnlyWarnings;
      FixItRewriter Rewriter(CI.getDiagnostics(), CI.getSourceManager(),
                             CI.getLangOpts(), FixItOpts.get());
      if (llvm::Error Err = FixAction->Execute()) {
        // FIXME this drops the error on the floor.
        consumeError(std::move(Err));
        return false;
      }
 
      err = Rewriter.WriteFixedFiles(&RewrittenFiles);
 
      FixAction->EndSourceFile();
      CI.setSourceManager(nullptr);
      CI.setFileManager(nullptr);
    } else {
      err = true;
    }
  }
  if (err)
    return false;
  CI.getDiagnosticClient().clear();
  CI.getDiagnostics().Reset();
 
  PreprocessorOptions &PPOpts = CI.getPreprocessorOpts();
  PPOpts.RemappedFiles.insert(PPOpts.RemappedFiles.end(),
                              RewrittenFiles.begin(), RewrittenFiles.end());
  PPOpts.RemappedFilesKeepOriginalName = false;
 
  return true;
}
 
#if CLANG_ENABLE_OBJC_REWRITER
 
std::unique_ptr<ASTConsumer>
RewriteObjCAction::CreateASTConsumer(CompilerInstance &CI, StringRef InFile) {
  if (std::unique_ptr<raw_ostream> OS =
          CI.createDefaultOutputFile(false, InFile, "cpp")) {
    if (CI.getLangOpts().ObjCRuntime.isNonFragile())
      return CreateModernObjCRewriter(std::string(InFile), std::move(OS),
                                      CI.getDiagnostics(), CI.getLangOpts(),
                                      CI.getDiagnosticOpts().NoRewriteMacros,
                                      (CI.