Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
14 | pmbaty | 1 | //===- llvm/Support/StringSaver.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_STRINGSAVER_H |
||
10 | #define LLVM_SUPPORT_STRINGSAVER_H |
||
11 | |||
12 | #include "llvm/ADT/DenseSet.h" |
||
13 | #include "llvm/ADT/StringRef.h" |
||
14 | #include "llvm/ADT/Twine.h" |
||
15 | #include "llvm/Support/Allocator.h" |
||
16 | |||
17 | namespace llvm { |
||
18 | |||
19 | /// Saves strings in the provided stable storage and returns a |
||
20 | /// StringRef with a stable character pointer. |
||
21 | class StringSaver final { |
||
22 | BumpPtrAllocator &Alloc; |
||
23 | |||
24 | public: |
||
25 | StringSaver(BumpPtrAllocator &Alloc) : Alloc(Alloc) {} |
||
26 | |||
27 | BumpPtrAllocator &getAllocator() const { return Alloc; } |
||
28 | |||
29 | // All returned strings are null-terminated: *save(S).end() == 0. |
||
30 | StringRef save(const char *S) { return save(StringRef(S)); } |
||
31 | StringRef save(StringRef S); |
||
32 | StringRef save(const Twine &S) { return save(StringRef(S.str())); } |
||
33 | StringRef save(const std::string &S) { return save(StringRef(S)); } |
||
34 | }; |
||
35 | |||
36 | /// Saves strings in the provided stable storage and returns a StringRef with a |
||
37 | /// stable character pointer. Saving the same string yields the same StringRef. |
||
38 | /// |
||
39 | /// Compared to StringSaver, it does more work but avoids saving the same string |
||
40 | /// multiple times. |
||
41 | /// |
||
42 | /// Compared to StringPool, it performs fewer allocations but doesn't support |
||
43 | /// refcounting/deletion. |
||
44 | class UniqueStringSaver final { |
||
45 | StringSaver Strings; |
||
46 | llvm::DenseSet<llvm::StringRef> Unique; |
||
47 | |||
48 | public: |
||
49 | UniqueStringSaver(BumpPtrAllocator &Alloc) : Strings(Alloc) {} |
||
50 | |||
51 | // All returned strings are null-terminated: *save(S).end() == 0. |
||
52 | StringRef save(const char *S) { return save(StringRef(S)); } |
||
53 | StringRef save(StringRef S); |
||
54 | StringRef save(const Twine &S) { return save(StringRef(S.str())); } |
||
55 | StringRef save(const std::string &S) { return save(StringRef(S)); } |
||
56 | }; |
||
57 | |||
58 | } |
||
59 | #endif |