bool CompilerInstance::InitializeSourceManager(const FrontendInputFile &Input,
DiagnosticsEngine &Diags,
FileManager &FileMgr,
SourceManager &SourceMgr,
const FrontendOptions &Opts) {
SrcMgr::CharacteristicKind
Kind = Input.isSystem() ? SrcMgr::C_System : SrcMgr::C_User;
if (Input.isBuffer()) {
SourceMgr.createMainFileIDForMemBuffer(Input.getBuffer(), Kind);
assert(!SourceMgr.getMainFileID().isInvalid() &&
"Couldn't establish MainFileID!");
return true;
}
StringRef InputFile = Input.getFile();
// Figure out where to get and map in the main file.
if (InputFile != "-") {
const FileEntry *File = FileMgr.getFile(InputFile);
if (!File) {
Diags.Report(diag::err_fe_error_reading) << InputFile;
return false;
}
// The natural SourceManager infrastructure can't currently handle named
// pipes, but we would at least like to accept them for the main
// file. Detect them here, read them with the more generic MemoryBuffer
// function, and simply override their contents as we do for STDIN.
if (File->isNamedPipe()) {
OwningPtr<llvm::MemoryBuffer> MB;
if (llvm::error_code ec = llvm::MemoryBuffer::getFile(InputFile, MB)) {
Diags.Report(diag::err_cannot_open_file) << InputFile << ec.message();
return false;
}
// Create a new virtual file that will have the correct size.
File = FileMgr.getVirtualFile(InputFile, MB->getBufferSize(), 0);
SourceMgr.overrideFileContents(File, MB.take());
}
SourceMgr.createMainFileID(File, Kind);
} else {
OwningPtr<llvm::MemoryBuffer> SB;
if (llvm::MemoryBuffer::getSTDIN(SB)) {
// FIXME: Give ec.message() in this diag.
Diags.Report(diag::err_fe_error_reading_stdin);
return false;
}
const FileEntry *File = FileMgr.getVirtualFile(SB->getBufferIdentifier(),
SB->getBufferSize(), 0);
SourceMgr.createMainFileID(File, Kind);
SourceMgr.overrideFileContents(File, SB.take());
}
assert(!SourceMgr.getMainFileID().isInvalid() &&
"Couldn't establish MainFileID!");
return true;
}
