1 //===--- FileRemapper.cpp - File Remapping Helper -------------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "clang/ARCMigrate/FileRemapper.h"
10 #include "clang/Basic/Diagnostic.h"
11 #include "clang/Basic/FileManager.h"
12 #include "clang/Lex/PreprocessorOptions.h"
13 #include "llvm/Support/FileSystem.h"
14 #include "llvm/Support/MemoryBuffer.h"
15 #include "llvm/Support/Path.h"
16 #include "llvm/Support/raw_ostream.h"
19 using namespace clang;
20 using namespace arcmt;
22 FileRemapper::FileRemapper() {
23 FileMgr.reset(new FileManager(FileSystemOptions()));
26 FileRemapper::~FileRemapper() {
30 void FileRemapper::clear(StringRef outputDir) {
31 for (MappingsTy::iterator
32 I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I)
33 resetTarget(I->second);
34 FromToMappings.clear();
35 assert(ToFromMappings.empty());
36 if (!outputDir.empty()) {
37 std::string infoFile = getRemapInfoFile(outputDir);
38 llvm::sys::fs::remove(infoFile);
42 std::string FileRemapper::getRemapInfoFile(StringRef outputDir) {
43 assert(!outputDir.empty());
44 SmallString<128> InfoFile = outputDir;
45 llvm::sys::path::append(InfoFile, "remap");
46 return InfoFile.str();
49 bool FileRemapper::initFromDisk(StringRef outputDir, DiagnosticsEngine &Diag,
50 bool ignoreIfFilesChanged) {
51 std::string infoFile = getRemapInfoFile(outputDir);
52 return initFromFile(infoFile, Diag, ignoreIfFilesChanged);
55 bool FileRemapper::initFromFile(StringRef filePath, DiagnosticsEngine &Diag,
56 bool ignoreIfFilesChanged) {
57 assert(FromToMappings.empty() &&
58 "initFromDisk should be called before any remap calls");
59 std::string infoFile = filePath;
60 if (!llvm::sys::fs::exists(infoFile))
63 std::vector<std::pair<const FileEntry *, const FileEntry *> > pairs;
65 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> fileBuf =
66 llvm::MemoryBuffer::getFile(infoFile);
68 return report("Error opening file: " + infoFile, Diag);
70 SmallVector<StringRef, 64> lines;
71 fileBuf.get()->getBuffer().split(lines, "\n");
73 for (unsigned idx = 0; idx+3 <= lines.size(); idx += 3) {
74 StringRef fromFilename = lines[idx];
75 unsigned long long timeModified;
76 if (lines[idx+1].getAsInteger(10, timeModified))
77 return report("Invalid file data: '" + lines[idx+1] + "' not a number",
79 StringRef toFilename = lines[idx+2];
81 const FileEntry *origFE = FileMgr->getFile(fromFilename);
83 if (ignoreIfFilesChanged)
85 return report("File does not exist: " + fromFilename, Diag);
87 const FileEntry *newFE = FileMgr->getFile(toFilename);
89 if (ignoreIfFilesChanged)
91 return report("File does not exist: " + toFilename, Diag);
94 if ((uint64_t)origFE->getModificationTime() != timeModified) {
95 if (ignoreIfFilesChanged)
97 return report("File was modified: " + fromFilename, Diag);
100 pairs.push_back(std::make_pair(origFE, newFE));
103 for (unsigned i = 0, e = pairs.size(); i != e; ++i)
104 remap(pairs[i].first, pairs[i].second);
109 bool FileRemapper::flushToDisk(StringRef outputDir, DiagnosticsEngine &Diag) {
110 using namespace llvm::sys;
112 if (fs::create_directory(outputDir))
113 return report("Could not create directory: " + outputDir, Diag);
115 std::string infoFile = getRemapInfoFile(outputDir);
116 return flushToFile(infoFile, Diag);
119 bool FileRemapper::flushToFile(StringRef outputPath, DiagnosticsEngine &Diag) {
120 using namespace llvm::sys;
123 std::string infoFile = outputPath;
124 llvm::raw_fd_ostream infoOut(infoFile, EC, llvm::sys::fs::F_None);
126 return report(EC.message(), Diag);
128 for (MappingsTy::iterator
129 I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I) {
131 const FileEntry *origFE = I->first;
132 SmallString<200> origPath = StringRef(origFE->getName());
133 fs::make_absolute(origPath);
134 infoOut << origPath << '\n';
135 infoOut << (uint64_t)origFE->getModificationTime() << '\n';
137 if (const FileEntry *FE = I->second.dyn_cast<const FileEntry *>()) {
138 SmallString<200> newPath = StringRef(FE->getName());
139 fs::make_absolute(newPath);
140 infoOut << newPath << '\n';
143 SmallString<64> tempPath;
145 if (fs::createTemporaryFile(path::filename(origFE->getName()),
146 path::extension(origFE->getName()).drop_front(), fd,
148 return report("Could not create file: " + tempPath.str(), Diag);
150 llvm::raw_fd_ostream newOut(fd, /*shouldClose=*/true);
151 llvm::MemoryBuffer *mem = I->second.get<llvm::MemoryBuffer *>();
152 newOut.write(mem->getBufferStart(), mem->getBufferSize());
155 const FileEntry *newE = FileMgr->getFile(tempPath);
157 infoOut << newE->getName() << '\n';
165 bool FileRemapper::overwriteOriginal(DiagnosticsEngine &Diag,
166 StringRef outputDir) {
167 using namespace llvm::sys;
169 for (MappingsTy::iterator
170 I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I) {
171 const FileEntry *origFE = I->first;
172 assert(I->second.is<llvm::MemoryBuffer *>());
173 if (!fs::exists(origFE->getName()))
174 return report(StringRef("File does not exist: ") + origFE->getName(),
178 llvm::raw_fd_ostream Out(origFE->getName(), EC, llvm::sys::fs::F_None);
180 return report(EC.message(), Diag);
182 llvm::MemoryBuffer *mem = I->second.get<llvm::MemoryBuffer *>();
183 Out.write(mem->getBufferStart(), mem->getBufferSize());
191 void FileRemapper::applyMappings(PreprocessorOptions &PPOpts) const {
192 for (MappingsTy::const_iterator
193 I = FromToMappings.begin(), E = FromToMappings.end(); I != E; ++I) {
194 if (const FileEntry *FE = I->second.dyn_cast<const FileEntry *>()) {
195 PPOpts.addRemappedFile(I->first->getName(), FE->getName());
197 llvm::MemoryBuffer *mem = I->second.get<llvm::MemoryBuffer *>();
198 PPOpts.addRemappedFile(I->first->getName(), mem);
202 PPOpts.RetainRemappedFileBuffers = true;
205 void FileRemapper::remap(StringRef filePath,
206 std::unique_ptr<llvm::MemoryBuffer> memBuf) {
207 remap(getOriginalFile(filePath), std::move(memBuf));
210 void FileRemapper::remap(const FileEntry *file,
211 std::unique_ptr<llvm::MemoryBuffer> memBuf) {
213 Target &targ = FromToMappings[file];
215 targ = memBuf.release();
218 void FileRemapper::remap(const FileEntry *file, const FileEntry *newfile) {
219 assert(file && newfile);
220 Target &targ = FromToMappings[file];
223 ToFromMappings[newfile] = file;
226 const FileEntry *FileRemapper::getOriginalFile(StringRef filePath) {
227 const FileEntry *file = FileMgr->getFile(filePath);
228 // If we are updating a file that overridden an original file,
229 // actually update the original file.
230 llvm::DenseMap<const FileEntry *, const FileEntry *>::iterator
231 I = ToFromMappings.find(file);
232 if (I != ToFromMappings.end()) {
234 assert(FromToMappings.find(file) != FromToMappings.end() &&
235 "Original file not in mappings!");
240 void FileRemapper::resetTarget(Target &targ) {
244 if (llvm::MemoryBuffer *oldmem = targ.dyn_cast<llvm::MemoryBuffer *>()) {
247 const FileEntry *toFE = targ.get<const FileEntry *>();
248 ToFromMappings.erase(toFE);
252 bool FileRemapper::report(const Twine &err, DiagnosticsEngine &Diag) {
253 Diag.Report(Diag.getCustomDiagID(DiagnosticsEngine::Error, "%0"))