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//===--- VirtualFileHelper.h ------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// This file defines an utility class for tests that needs a source
/// manager for a virtual file with customizable content.
///
//===----------------------------------------------------------------------===//
#ifndef CLANG_MODERNIZE_VIRTUAL_FILE_HELPER_H
#define CLANG_MODERNIZE_VIRTUAL_FILE_HELPER_H
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/DiagnosticOptions.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
namespace clang {
/// Class that provides easy access to a SourceManager and that allows to
/// map virtual files conveniently.
class VirtualFileHelper {
struct VirtualFile {
std::string FileName;
std::string Code;
};
public:
VirtualFileHelper()
: DiagOpts(new DiagnosticOptions()),
Diagnostics(IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
&*DiagOpts),
DiagnosticPrinter(llvm::outs(), &*DiagOpts),
Files((FileSystemOptions())) {}
/// Create a virtual file \p FileName, with content \p Code.
void mapFile(llvm::StringRef FileName, llvm::StringRef Code) {
VirtualFile VF = { FileName, Code };
VirtualFiles.push_back(VF);
}
/// Create a new \c SourceManager with the virtual files and contents
/// mapped to it.
SourceManager &getNewSourceManager() {
Sources.reset(new SourceManager(Diagnostics, Files));
mapVirtualFiles(*Sources);
return *Sources;
}
/// Map the virtual file contents in the given \c SourceManager.
void mapVirtualFiles(SourceManager &SM) const {
for (llvm::SmallVectorImpl<VirtualFile>::const_iterator
I = VirtualFiles.begin(),
E = VirtualFiles.end();
I != E; ++I) {
std::unique_ptr<llvm::MemoryBuffer> Buf =
llvm::MemoryBuffer::getMemBuffer(I->Code);
const FileEntry *Entry = SM.getFileManager().getVirtualFile(
I->FileName, Buf->getBufferSize(), /*ModificationTime=*/0);
SM.overrideFileContents(Entry, std::move(Buf));
}
}
private:
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
DiagnosticsEngine Diagnostics;
TextDiagnosticPrinter DiagnosticPrinter;
FileManager Files;
// most tests don't need more than one file
llvm::SmallVector<VirtualFile, 1> VirtualFiles;
std::unique_ptr<SourceManager> Sources;
};
} // end namespace clang
#endif // CLANG_MODERNIZE_VIRTUAL_FILE_HELPER_H
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