1 | //===-- bytemap.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 SCUDO_BYTEMAP_H_ |
10 | #define SCUDO_BYTEMAP_H_ |
11 | |
12 | #include "atomic_helpers.h" |
13 | #include "common.h" |
14 | #include "mutex.h" |
15 | |
16 | namespace scudo { |
17 | |
18 | template <uptr Size> class FlatByteMap { |
19 | public: |
20 | void init() { DCHECK(Size == 0 || Map[0] == 0); } |
21 | |
22 | void unmapTestOnly() { memset(Map, 0, Size); } |
23 | |
24 | void set(uptr Index, u8 Value) { |
25 | DCHECK_LT(Index, Size); |
26 | DCHECK_EQ(0U, Map[Index]); |
27 | Map[Index] = Value; |
28 | } |
29 | u8 operator[](uptr Index) { |
30 | DCHECK_LT(Index, Size); |
31 | return Map[Index]; |
32 | } |
33 | |
34 | void disable() {} |
35 | void enable() {} |
36 | |
37 | private: |
38 | u8 Map[Size] = {}; |
39 | }; |
40 | |
41 | } // namespace scudo |
42 | |
43 | #endif // SCUDO_BYTEMAP_H_ |
44 | |