Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
14 | pmbaty | 1 | //===- CFGReachabilityAnalysis.h - Basic reachability analysis --*- 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 | // This file defines a flow-sensitive, (mostly) path-insensitive reachability |
||
10 | // analysis based on Clang's CFGs. Clients can query if a given basic block |
||
11 | // is reachable within the CFG. |
||
12 | // |
||
13 | //===----------------------------------------------------------------------===// |
||
14 | |||
15 | #ifndef LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H |
||
16 | #define LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H |
||
17 | |||
18 | #include "llvm/ADT/BitVector.h" |
||
19 | #include "llvm/ADT/DenseMap.h" |
||
20 | |||
21 | namespace clang { |
||
22 | |||
23 | class CFG; |
||
24 | class CFGBlock; |
||
25 | |||
26 | // A class that performs reachability queries for CFGBlocks. Several internal |
||
27 | // checks in this checker require reachability information. The requests all |
||
28 | // tend to have a common destination, so we lazily do a predecessor search |
||
29 | // from the destination node and cache the results to prevent work |
||
30 | // duplication. |
||
31 | class CFGReverseBlockReachabilityAnalysis { |
||
32 | using ReachableSet = llvm::BitVector; |
||
33 | using ReachableMap = llvm::DenseMap<unsigned, ReachableSet>; |
||
34 | |||
35 | ReachableSet analyzed; |
||
36 | ReachableMap reachable; |
||
37 | |||
38 | public: |
||
39 | CFGReverseBlockReachabilityAnalysis(const CFG &cfg); |
||
40 | |||
41 | /// Returns true if the block 'Dst' can be reached from block 'Src'. |
||
42 | bool isReachable(const CFGBlock *Src, const CFGBlock *Dst); |
||
43 | |||
44 | private: |
||
45 | void mapReachability(const CFGBlock *Dst); |
||
46 | }; |
||
47 | |||
48 | } // namespace clang |
||
49 | |||
50 | #endif // LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H |