82 lines
2.7 KiB
C++
82 lines
2.7 KiB
C++
//===--- VirtualFileHelper.h ------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// This file defines an utility class for tests that needs a source
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/// manager for a virtual file with customizable content.
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///
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//===----------------------------------------------------------------------===//
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#ifndef CLANG_MODERNIZE_VIRTUAL_FILE_HELPER_H
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#define CLANG_MODERNIZE_VIRTUAL_FILE_HELPER_H
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#include "clang/Basic/Diagnostic.h"
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#include "clang/Basic/DiagnosticOptions.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Frontend/TextDiagnosticPrinter.h"
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namespace clang {
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/// Class that provides easy access to a SourceManager and that allows to
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/// map virtual files conveniently.
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class VirtualFileHelper {
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struct VirtualFile {
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std::string FileName;
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std::string Code;
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};
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public:
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VirtualFileHelper()
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: DiagOpts(new DiagnosticOptions()),
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Diagnostics(IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
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&*DiagOpts),
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DiagnosticPrinter(llvm::outs(), &*DiagOpts),
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Files((FileSystemOptions())) {}
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/// Create a virtual file \p FileName, with content \p Code.
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void mapFile(llvm::StringRef FileName, llvm::StringRef Code) {
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VirtualFile VF = { FileName, Code };
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VirtualFiles.push_back(VF);
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}
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/// Create a new \c SourceManager with the virtual files and contents
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/// mapped to it.
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SourceManager &getNewSourceManager() {
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Sources.reset(new SourceManager(Diagnostics, Files));
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mapVirtualFiles(*Sources);
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return *Sources;
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}
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/// Map the virtual file contents in the given \c SourceManager.
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void mapVirtualFiles(SourceManager &SM) const {
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for (llvm::SmallVectorImpl<VirtualFile>::const_iterator
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I = VirtualFiles.begin(),
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E = VirtualFiles.end();
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I != E; ++I) {
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std::unique_ptr<llvm::MemoryBuffer> Buf =
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llvm::MemoryBuffer::getMemBuffer(I->Code);
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const FileEntry *Entry = SM.getFileManager().getVirtualFile(
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I->FileName, Buf->getBufferSize(), /*ModificationTime=*/0);
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SM.overrideFileContents(Entry, std::move(Buf));
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}
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}
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private:
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IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
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DiagnosticsEngine Diagnostics;
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TextDiagnosticPrinter DiagnosticPrinter;
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FileManager Files;
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// most tests don't need more than one file
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llvm::SmallVector<VirtualFile, 1> VirtualFiles;
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std::unique_ptr<SourceManager> Sources;
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};
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} // end namespace clang
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#endif // CLANG_MODERNIZE_VIRTUAL_FILE_HELPER_H
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