diff options
Diffstat (limited to 'contrib/llvm/tools/clang/lib/ARCMigrate/FileRemapper.cpp')
| -rw-r--r-- | contrib/llvm/tools/clang/lib/ARCMigrate/FileRemapper.cpp | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/ARCMigrate/FileRemapper.cpp b/contrib/llvm/tools/clang/lib/ARCMigrate/FileRemapper.cpp new file mode 100644 index 0000000..474ce7d --- /dev/null +++ b/contrib/llvm/tools/clang/lib/ARCMigrate/FileRemapper.cpp @@ -0,0 +1,293 @@ +//===--- FileRemapper.cpp - File Remapping Helper -------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "clang/ARCMigrate/FileRemapper.h" +#include "clang/Frontend/PreprocessorOptions.h" +#include "clang/Basic/FileManager.h" +#include "clang/Basic/Diagnostic.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/Path.h" +#include "llvm/Support/FileSystem.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); + bool existed; + llvm::sys::fs::remove(infoFile, existed); + } +} + +std::string FileRemapper::getRemapInfoFile(StringRef outputDir) { + assert(!outputDir.empty()); + llvm::sys::Path dir(outputDir); + llvm::sys::Path infoFile = dir; + infoFile.appendComponent("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; + bool fileExists = false; + llvm::sys::fs::exists(infoFile, fileExists); + if (!fileExists) + return false; + + std::vector<std::pair<const FileEntry *, const FileEntry *> > pairs; + + OwningPtr<llvm::MemoryBuffer> fileBuf; + if (llvm::MemoryBuffer::getFile(infoFile.c_str(), fileBuf)) + return report("Error opening file: " + infoFile, Diag); + + SmallVector<StringRef, 64> lines; + fileBuf->getBuffer().split(lines, "\n"); + + for (unsigned idx = 0; idx+3 <= lines.size(); idx += 3) { + StringRef fromFilename = lines[idx]; + unsigned long long timeModified; + lines[idx+1].getAsInteger(10, timeModified); + StringRef toFilename = lines[idx+2]; + + const FileEntry *origFE = FileMgr->getFile(fromFilename); + if (!origFE) { + if (ignoreIfFilesChanged) + continue; + return report("File does not exist: " + fromFilename, Diag); + } + 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; + + bool existed; + if (fs::create_directory(outputDir, existed) != llvm::errc::success) + 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::string errMsg; + std::string infoFile = outputPath; + llvm::raw_fd_ostream infoOut(infoFile.c_str(), errMsg, + llvm::raw_fd_ostream::F_Binary); + if (!errMsg.empty()) + return report(errMsg, 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; + tempPath = path::filename(origFE->getName()); + tempPath += "-%%%%%%%%"; + tempPath += path::extension(origFE->getName()); + int fd; + if (fs::unique_file(tempPath.str(), fd, tempPath) != llvm::errc::success) + 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(); + + const FileEntry *newE = FileMgr->getFile(tempPath); + 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; + if (const FileEntry *newFE = I->second.dyn_cast<const FileEntry *>()) { + if (fs::copy_file(newFE->getName(), origFE->getName(), + fs::copy_option::overwrite_if_exists) != llvm::errc::success) + return report(StringRef("Could not copy file '") + newFE->getName() + + "' to file '" + origFE->getName() + "'", Diag); + } else { + + bool fileExists = false; + fs::exists(origFE->getName(), fileExists); + if (!fileExists) + return report(StringRef("File does not exist: ") + origFE->getName(), + Diag); + + std::string errMsg; + llvm::raw_fd_ostream Out(origFE->getName(), errMsg, + llvm::raw_fd_ostream::F_Binary); + if (!errMsg.empty()) + return report(errMsg, 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::transferMappingsAndClear(PreprocessorOptions &PPOpts) { + for (MappingsTy::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); + } + I->second = Target(); + } + + PPOpts.RetainRemappedFileBuffers = false; + clear(); +} + +void FileRemapper::remap(StringRef filePath, llvm::MemoryBuffer *memBuf) { + remap(getOriginalFile(filePath), memBuf); +} + +void FileRemapper::remap(StringRef filePath, StringRef newPath) { + const FileEntry *file = getOriginalFile(filePath); + const FileEntry *newfile = FileMgr->getFile(newPath); + remap(file, newfile); +} + +void FileRemapper::remap(const FileEntry *file, llvm::MemoryBuffer *memBuf) { + assert(file); + Target &targ = FromToMappings[file]; + resetTarget(targ); + targ = memBuf; +} + +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 = FileMgr->getFile(filePath); + // If we are updating a file that overriden 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) { + SmallString<128> buf; + unsigned ID = Diag.getDiagnosticIDs()->getCustomDiagID(DiagnosticIDs::Error, + err.toStringRef(buf)); + Diag.Report(ID); + return true; +} |
