| //===- CFGReachabilityAnalysis.h - Basic reachability analysis --*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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 { |
| using ReachableSet = llvm::BitVector; |
| using ReachableMap = llvm::DenseMap<unsigned, ReachableSet>; |
| |
| 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 // LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H |