| //===--- FileRemapper.cpp - File Remapping Helper -------------------------===// |
| // |
| // 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/ARCMigrate/FileRemapper.h" |
| #include "clang/Basic/Diagnostic.h" |
| #include "clang/Basic/FileManager.h" |
| #include "clang/Lex/PreprocessorOptions.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/Path.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <fstream> |
| |
| using namespace clang; |
| using namespace arcmt; |
| |
| FileRemapper::FileRemapper() { |
| FileMgr.reset(new FileManager(FileSystemOptions())); |
| } |
| |
| FileRemapper::~FileRemapper() { |
| clear(); |
| } |
| |
| void FileRemapper::clear(StringRef outputDir) { |
| for (MappingsTy::iterator |
| I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I) |
| resetTarget(I->second); |
| FromToMappings.clear(); |
| assert(ToFromMappings.empty()); |
| if (!outputDir.empty()) { |
| std::string infoFile = getRemapInfoFile(outputDir); |
| llvm::sys::fs::remove(infoFile); |
| } |
| } |
| |
| std::string FileRemapper::getRemapInfoFile(StringRef outputDir) { |
| assert(!outputDir.empty()); |
| SmallString<128> InfoFile = outputDir; |
| llvm::sys::path::append(InfoFile, "remap"); |
| return InfoFile.str(); |
| } |
| |
| bool FileRemapper::initFromDisk(StringRef outputDir, DiagnosticsEngine &Diag, |
| bool ignoreIfFilesChanged) { |
| std::string infoFile = getRemapInfoFile(outputDir); |
| return initFromFile(infoFile, Diag, ignoreIfFilesChanged); |
| } |
| |
| bool FileRemapper::initFromFile(StringRef filePath, DiagnosticsEngine &Diag, |
| bool ignoreIfFilesChanged) { |
| assert(FromToMappings.empty() && |
| "initFromDisk should be called before any remap calls"); |
| std::string infoFile = filePath; |
| if (!llvm::sys::fs::exists(infoFile)) |
| return false; |
| |
| std::vector<std::pair<const FileEntry *, const FileEntry *> > pairs; |
| |
| llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileBuf = |
| llvm::MemoryBuffer::getFile(infoFile); |
| if (!fileBuf) |
| return report("Error opening file: " + infoFile, Diag); |
| |
| SmallVector<StringRef, 64> lines; |
| fileBuf.get()->getBuffer().split(lines, "\n"); |
| |
| for (unsigned idx = 0; idx+3 <= lines.size(); idx += 3) { |
| StringRef fromFilename = lines[idx]; |
| unsigned long long timeModified; |
| if (lines[idx+1].getAsInteger(10, timeModified)) |
| return report("Invalid file data: '" + lines[idx+1] + "' not a number", |
| Diag); |
| StringRef toFilename = lines[idx+2]; |
| |
| llvm::ErrorOr<const FileEntry *> origFE = FileMgr->getFile(fromFilename); |
| if (!origFE) { |
| if (ignoreIfFilesChanged) |
| continue; |
| return report("File does not exist: " + fromFilename, Diag); |
| } |
| llvm::ErrorOr<const FileEntry *> newFE = FileMgr->getFile(toFilename); |
| if (!newFE) { |
| if (ignoreIfFilesChanged) |
| continue; |
| return report("File does not exist: " + toFilename, Diag); |
| } |
| |
| if ((uint64_t)(*origFE)->getModificationTime() != timeModified) { |
| if (ignoreIfFilesChanged) |
| continue; |
| return report("File was modified: " + fromFilename, Diag); |
| } |
| |
| pairs.push_back(std::make_pair(*origFE, *newFE)); |
| } |
| |
| for (unsigned i = 0, e = pairs.size(); i != e; ++i) |
| remap(pairs[i].first, pairs[i].second); |
| |
| return false; |
| } |
| |
| bool FileRemapper::flushToDisk(StringRef outputDir, DiagnosticsEngine &Diag) { |
| using namespace llvm::sys; |
| |
| if (fs::create_directory(outputDir)) |
| return report("Could not create directory: " + outputDir, Diag); |
| |
| std::string infoFile = getRemapInfoFile(outputDir); |
| return flushToFile(infoFile, Diag); |
| } |
| |
| bool FileRemapper::flushToFile(StringRef outputPath, DiagnosticsEngine &Diag) { |
| using namespace llvm::sys; |
| |
| std::error_code EC; |
| std::string infoFile = outputPath; |
| llvm::raw_fd_ostream infoOut(infoFile, EC, llvm::sys::fs::OF_None); |
| if (EC) |
| return report(EC.message(), Diag); |
| |
| for (MappingsTy::iterator |
| I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I) { |
| |
| const FileEntry *origFE = I->first; |
| SmallString<200> origPath = StringRef(origFE->getName()); |
| fs::make_absolute(origPath); |
| infoOut << origPath << '\n'; |
| infoOut << (uint64_t)origFE->getModificationTime() << '\n'; |
| |
| if (const FileEntry *FE = I->second.dyn_cast<const FileEntry *>()) { |
| SmallString<200> newPath = StringRef(FE->getName()); |
| fs::make_absolute(newPath); |
| infoOut << newPath << '\n'; |
| } else { |
| |
| SmallString<64> tempPath; |
| int fd; |
| if (fs::createTemporaryFile(path::filename(origFE->getName()), |
| path::extension(origFE->getName()).drop_front(), fd, |
| tempPath)) |
| return report("Could not create file: " + tempPath.str(), Diag); |
| |
| llvm::raw_fd_ostream newOut(fd, /*shouldClose=*/true); |
| llvm::MemoryBuffer *mem = I->second.get<llvm::MemoryBuffer *>(); |
| newOut.write(mem->getBufferStart(), mem->getBufferSize()); |
| newOut.close(); |
| |
| auto newE = FileMgr->getFile(tempPath); |
| if (newE) { |
| remap(origFE, *newE); |
| infoOut << (*newE)->getName() << '\n'; |
| } |
| } |
| } |
| |
| infoOut.close(); |
| return false; |
| } |
| |
| bool FileRemapper::overwriteOriginal(DiagnosticsEngine &Diag, |
| StringRef outputDir) { |
| using namespace llvm::sys; |
| |
| for (MappingsTy::iterator |
| I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I) { |
| const FileEntry *origFE = I->first; |
| assert(I->second.is<llvm::MemoryBuffer *>()); |
| if (!fs::exists(origFE->getName())) |
| return report(StringRef("File does not exist: ") + origFE->getName(), |
| Diag); |
| |
| std::error_code EC; |
| llvm::raw_fd_ostream Out(origFE->getName(), EC, llvm::sys::fs::OF_None); |
| if (EC) |
| return report(EC.message(), Diag); |
| |
| llvm::MemoryBuffer *mem = I->second.get<llvm::MemoryBuffer *>(); |
| Out.write(mem->getBufferStart(), mem->getBufferSize()); |
| Out.close(); |
| } |
| |
| clear(outputDir); |
| return false; |
| } |
| |
| void FileRemapper::applyMappings(PreprocessorOptions &PPOpts) const { |
| for (MappingsTy::const_iterator |
| I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I) { |
| if (const FileEntry *FE = I->second.dyn_cast<const FileEntry *>()) { |
| PPOpts.addRemappedFile(I->first->getName(), FE->getName()); |
| } else { |
| llvm::MemoryBuffer *mem = I->second.get<llvm::MemoryBuffer *>(); |
| PPOpts.addRemappedFile(I->first->getName(), mem); |
| } |
| } |
| |
| PPOpts.RetainRemappedFileBuffers = true; |
| } |
| |
| void FileRemapper::remap(StringRef filePath, |
| std::unique_ptr<llvm::MemoryBuffer> memBuf) { |
| remap(getOriginalFile(filePath), std::move(memBuf)); |
| } |
| |
| void FileRemapper::remap(const FileEntry *file, |
| std::unique_ptr<llvm::MemoryBuffer> memBuf) { |
| assert(file); |
| Target &targ = FromToMappings[file]; |
| resetTarget(targ); |
| targ = memBuf.release(); |
| } |
| |
| void FileRemapper::remap(const FileEntry *file, const FileEntry *newfile) { |
| assert(file && newfile); |
| Target &targ = FromToMappings[file]; |
| resetTarget(targ); |
| targ = newfile; |
| ToFromMappings[newfile] = file; |
| } |
| |
| const FileEntry *FileRemapper::getOriginalFile(StringRef filePath) { |
| const FileEntry *file = nullptr; |
| if (auto fileOrErr = FileMgr->getFile(filePath)) |
| file = *fileOrErr; |
| // If we are updating a file that overridden an original file, |
| // actually update the original file. |
| llvm::DenseMap<const FileEntry *, const FileEntry *>::iterator |
| I = ToFromMappings.find(file); |
| if (I != ToFromMappings.end()) { |
| file = I->second; |
| assert(FromToMappings.find(file) != FromToMappings.end() && |
| "Original file not in mappings!"); |
| } |
| return file; |
| } |
| |
| void FileRemapper::resetTarget(Target &targ) { |
| if (!targ) |
| return; |
| |
| if (llvm::MemoryBuffer *oldmem = targ.dyn_cast<llvm::MemoryBuffer *>()) { |
| delete oldmem; |
| } else { |
| const FileEntry *toFE = targ.get<const FileEntry *>(); |
| ToFromMappings.erase(toFE); |
| } |
| } |
| |
| bool FileRemapper::report(const Twine &err, DiagnosticsEngine &Diag) { |
| Diag.Report(Diag.getCustomDiagID(DiagnosticsEngine::Error, "%0")) |
| << err.str(); |
| return true; |
| } |