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| //===--- 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;
}
|