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//===--- tools/extra/clang-rename/ClangRename.cpp - Clang rename tool -----===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// \file
/// This file implements a clang-rename tool that automatically finds and
/// renames symbols in C++ code.
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/IdentifierTable.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Basic/TokenKinds.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "clang/Tooling/CommonOptionsParser.h"
#include "clang/Tooling/Refactoring.h"
#include "clang/Tooling/Refactoring/Rename/RenamingAction.h"
#include "clang/Tooling/Refactoring/Rename/USRFindingAction.h"
#include "clang/Tooling/ReplacementsYaml.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/IntrusiveRefCntPtr.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/YAMLTraits.h"
#include "llvm/Support/raw_ostream.h"
#include <string>
#include <system_error>
using namespace llvm;
using namespace clang;
/// An oldname -> newname rename.
struct RenameAllInfo {
unsigned Offset = 0;
std::string QualifiedName;
std::string NewName;
namespace llvm {
namespace yaml {
/// Specialized MappingTraits to describe how a RenameAllInfo is
/// (de)serialized.
template <> struct MappingTraits<RenameAllInfo> {
static void mapping(IO &IO, RenameAllInfo &Info) {
IO.mapOptional("Offset", Info.Offset);
IO.mapOptional("QualifiedName", Info.QualifiedName);
IO.mapRequired("NewName", Info.NewName);
} // end namespace yaml
} // end namespace llvm
static cl::OptionCategory ClangRenameOptions("clang-rename common options");
static cl::list<unsigned> SymbolOffsets(
cl::desc("Locates the symbol by offset as opposed to <line>:<column>."),
cl::ZeroOrMore, cl::cat(ClangRenameOptions));
static cl::opt<bool> Inplace("i", cl::desc("Overwrite edited <file>s."),
static cl::list<std::string>
cl::desc("The fully qualified name of the symbol."),
cl::ZeroOrMore, cl::cat(ClangRenameOptions));
static cl::list<std::string>
NewNames("new-name", cl::desc("The new name to change the symbol to."),
cl::ZeroOrMore, cl::cat(ClangRenameOptions));
static cl::opt<bool> PrintName(
cl::desc("Print the found symbol's name prior to renaming to stderr."),
static cl::opt<bool> PrintLocations(
"pl", cl::desc("Print the locations affected by renaming to stderr."),
static cl::opt<std::string>
cl::desc("YAML file to store suggested fixes in."),
cl::value_desc("filename"), cl::cat(ClangRenameOptions));
static cl::opt<std::string>
Input("input", cl::desc("YAML file to load oldname-newname pairs from."),
cl::Optional, cl::cat(ClangRenameOptions));
static cl::opt<bool> Force("force",
cl::desc("Ignore nonexistent qualified names."),
int main(int argc, const char **argv) {
tooling::CommonOptionsParser OP(argc, argv, ClangRenameOptions);
if (!Input.empty()) {
// Populate QualifiedNames and NewNames from a YAML file.
ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer =
if (!Buffer) {
errs() << "clang-rename: failed to read " << Input << ": "
<< Buffer.getError().message() << "\n";
return 1;
std::vector<RenameAllInfo> Infos;
llvm::yaml::Input YAML(Buffer.get()->getBuffer());
YAML >> Infos;
for (const auto &Info : Infos) {
if (!Info.QualifiedName.empty())
// Check the arguments for correctness.
if (NewNames.empty()) {
errs() << "clang-rename: -new-name must be specified.\n\n";
return 1;
if (SymbolOffsets.empty() == QualifiedNames.empty()) {
errs() << "clang-rename: -offset and -qualified-name can't be present at "
"the same time.\n";
return 1;
// Check if NewNames is a valid identifier in C++17.
LangOptions Options;
Options.CPlusPlus = true;
Options.CPlusPlus17 = true;
IdentifierTable Table(Options);
for (const auto &NewName : NewNames) {
auto NewNameTokKind = Table.get(NewName).getTokenID();
if (!tok::isAnyIdentifier(NewNameTokKind)) {
errs() << "ERROR: new name is not a valid identifier in C++17.\n\n";
return 1;
if (SymbolOffsets.size() + QualifiedNames.size() != NewNames.size()) {
errs() << "clang-rename: number of symbol offsets(" << SymbolOffsets.size()
<< ") + number of qualified names (" << QualifiedNames.size()
<< ") must be equal to number of new names(" << NewNames.size()
<< ").\n\n";
return 1;
auto Files = OP.getSourcePathList();
tooling::RefactoringTool Tool(OP.getCompilations(), Files);
tooling::USRFindingAction FindingAction(SymbolOffsets, QualifiedNames, Force);;
const std::vector<std::vector<std::string>> &USRList =
const std::vector<std::string> &PrevNames = FindingAction.getUSRSpellings();
if (PrintName) {
for (const auto &PrevName : PrevNames) {
outs() << "clang-rename found name: " << PrevName << '\n';
if (FindingAction.errorOccurred()) {
// Diagnostics are already issued at this point.
return 1;
// Perform the renaming.
tooling::RenamingAction RenameAction(NewNames, PrevNames, USRList,
Tool.getReplacements(), PrintLocations);
std::unique_ptr<tooling::FrontendActionFactory> Factory =
int ExitCode;
if (Inplace) {
ExitCode = Tool.runAndSave(Factory.get());
} else {
ExitCode =;
if (!ExportFixes.empty()) {
std::error_code EC;
llvm::raw_fd_ostream OS(ExportFixes, EC, llvm::sys::fs::F_None);
if (EC) {
llvm::errs() << "Error opening output file: " << EC.message() << '\n';
return 1;
// Export replacements.
tooling::TranslationUnitReplacements TUR;
const auto &FileToReplacements = Tool.getReplacements();
for (const auto &Entry : FileToReplacements)
TUR.Replacements.insert(TUR.Replacements.end(), Entry.second.begin(),
yaml::Output YAML(OS);
return 0;
// Write every file to stdout. Right now we just barf the files without any
// indication of which files start where, other than that we print the files
// in the same order we see them.
LangOptions DefaultLangOptions;
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
TextDiagnosticPrinter DiagnosticPrinter(errs(), &*DiagOpts);
DiagnosticsEngine Diagnostics(
IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()), &*DiagOpts,
&DiagnosticPrinter, false);
auto &FileMgr = Tool.getFiles();
SourceManager Sources(Diagnostics, FileMgr);
Rewriter Rewrite(Sources, DefaultLangOptions);
for (const auto &File : Files) {
const auto *Entry = FileMgr.getFile(File);
const auto ID = Sources.getOrCreateFileID(Entry, SrcMgr::C_User);
return ExitCode;