1 //===-- sanitizer_chained_origin_depot.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 // A storage for chained origins.
10 //===----------------------------------------------------------------------===//
11 
12 #ifndef SANITIZER_CHAINED_ORIGIN_DEPOT_H
13 #define SANITIZER_CHAINED_ORIGIN_DEPOT_H
14 
15 #include "sanitizer_common.h"
16 
17 namespace __sanitizer {
18 
19 class ChainedOriginDepot {
20  public:
21   ChainedOriginDepot();
22 
23   // Gets the statistic of the origin chain storage.
24   StackDepotStats GetStats() const;
25 
26   // Stores a chain with StackDepot ID here_id and previous chain ID prev_id.
27   // If successful, returns true and the new chain id new_id.
28   // If the same element already exists, returns false and sets new_id to the
29   // existing ID.
30   bool Put(u32 here_id, u32 prev_id, u32 *new_id);
31 
32   // Retrieves the stored StackDepot ID for the given origin ID.
33   u32 Get(u32 id, u32 *other);
34 
35   void LockAll();
36   void UnlockAll();
37   void TestOnlyUnmap();
38 
39  private:
40   ChainedOriginDepot(const ChainedOriginDepot &) = delete;
41   void operator=(const ChainedOriginDepot &) = delete;
42 };
43 
44 }  // namespace __sanitizer
45 
46 #endif  // SANITIZER_CHAINED_ORIGIN_DEPOT_H
47