blob: 830f1d8e2da398b9e3fa82f1d242bb0d03023e98 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
//==- CFGReachabilityAnalysis.h - Basic reachability analysis ----*- C++ -*-==//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a flow-sensitive, (mostly) path-insensitive reachability
// analysis based on Clang's CFGs. Clients can query if a given basic block
// is reachable within the CFG.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H
#define LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
namespace clang {
class CFG;
class CFGBlock;
// A class that performs reachability queries for CFGBlocks. Several internal
// checks in this checker require reachability information. The requests all
// tend to have a common destination, so we lazily do a predecessor search
// from the destination node and cache the results to prevent work
// duplication.
class CFGReverseBlockReachabilityAnalysis {
typedef llvm::BitVector ReachableSet;
typedef llvm::DenseMap<unsigned, ReachableSet> ReachableMap;
ReachableSet analyzed;
ReachableMap reachable;
public:
CFGReverseBlockReachabilityAnalysis(const CFG &cfg);
/// Returns true if the block 'Dst' can be reached from block 'Src'.
bool isReachable(const CFGBlock *Src, const CFGBlock *Dst);
private:
void mapReachability(const CFGBlock *Dst);
};
} // namespace clang
#endif
|
