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