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comparison include/llvm/Support/FileCollector.h @ 147:c2174574ed3a

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LLVM 10
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Wed, 14 Aug 2019 16:55:33 +0900
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134:3a76565eade5 147:c2174574ed3a
1 //===-- FileCollector.h -----------------------------------------*- C++ -*-===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8
9 #ifndef LLVM_SUPPORT_FILE_COLLECTOR_H
10 #define LLVM_SUPPORT_FILE_COLLECTOR_H
11
12 #include "llvm/ADT/SmallVector.h"
13 #include "llvm/ADT/StringMap.h"
14 #include "llvm/ADT/StringSet.h"
15 #include "llvm/ADT/Twine.h"
16 #include "llvm/Support/VirtualFileSystem.h"
17
18 #include <mutex>
19
20 namespace llvm {
21
22 /// Collects files into a directory and generates a mapping that can be used by
23 /// the VFS.
24 class FileCollector {
25 public:
26 FileCollector(std::string Root, std::string OverlayRoot);
27
28 void addFile(const Twine &file);
29
30 /// Write the yaml mapping (for the VFS) to the given file.
31 std::error_code writeMapping(StringRef mapping_file);
32
33 /// Copy the files into the root directory.
34 ///
35 /// When StopOnError is true (the default) we abort as soon as one file
36 /// cannot be copied. This is relatively common, for example when a file was
37 /// removed after it was added to the mapping.
38 std::error_code copyFiles(bool StopOnError = true);
39
40 /// Create a VFS that collects all the paths that might be looked at by the
41 /// file system accesses.
42 static IntrusiveRefCntPtr<vfs::FileSystem>
43 createCollectorVFS(IntrusiveRefCntPtr<vfs::FileSystem> BaseFS,
44 std::shared_ptr<FileCollector> Collector);
45
46 private:
47 void addFileImpl(StringRef SrcPath);
48
49 bool markAsSeen(StringRef Path) { return Seen.insert(Path).second; }
50
51 bool getRealPath(StringRef SrcPath, SmallVectorImpl<char> &Result);
52
53 void addFileToMapping(StringRef VirtualPath, StringRef RealPath) {
54 VFSWriter.addFileMapping(VirtualPath, RealPath);
55 }
56
57 protected:
58 /// Synchronizes adding files.
59 std::mutex Mutex;
60
61 /// The root directory where files are copied.
62 std::string Root;
63
64 /// The root directory where the VFS overlay lives.
65 std::string OverlayRoot;
66
67 /// Tracks already seen files so they can be skipped.
68 StringSet<> Seen;
69
70 /// The yaml mapping writer.
71 vfs::YAMLVFSWriter VFSWriter;
72
73 /// Caches RealPath calls when resolving symlinks.
74 StringMap<std::string> SymlinkMap;
75 };
76
77 } // end namespace llvm
78
79 #endif // LLVM_SUPPORT_FILE_COLLECTOR_H