6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//===- CFGReachabilityAnalysis.h - Basic reachability analysis --*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a flow-sensitive, (mostly) path-insensitive reachability
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// analysis based on Clang's CFGs. Clients can query if a given basic block
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// is reachable within the CFG.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H
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#define LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H
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#include "llvm/ADT/BitVector.h"
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#include "llvm/ADT/DenseMap.h"
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namespace clang {
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class CFG;
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class CFGBlock;
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// A class that performs reachability queries for CFGBlocks. Several internal
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// checks in this checker require reachability information. The requests all
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// tend to have a common destination, so we lazily do a predecessor search
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// from the destination node and cache the results to prevent work
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// duplication.
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class CFGReverseBlockReachabilityAnalysis {
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using ReachableSet = llvm::BitVector;
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using ReachableMap = llvm::DenseMap<unsigned, ReachableSet>;
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ReachableSet analyzed;
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ReachableMap reachable;
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public:
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CFGReverseBlockReachabilityAnalysis(const CFG &cfg);
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/// Returns true if the block 'Dst' can be reached from block 'Src'.
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bool isReachable(const CFGBlock *Src, const CFGBlock *Dst);
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private:
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void mapReachability(const CFGBlock *Dst);
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};
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} // namespace clang
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#endif // LLVM_CLANG_ANALYSIS_ANALYSES_CFGREACHABILITYANALYSIS_H
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