| 1 | //===- ReachableCode.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 flow-sensitive, path-insensitive analysis of unreachable code. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #ifndef LLVM_CLANG_ANALYSIS_ANALYSES_REACHABLECODE_H |
| 14 | #define LLVM_CLANG_ANALYSIS_ANALYSES_REACHABLECODE_H |
| 15 | |
| 16 | #include "clang/Basic/SourceLocation.h" |
| 17 | |
| 18 | //===----------------------------------------------------------------------===// |
| 19 | // Forward declarations. |
| 20 | //===----------------------------------------------------------------------===// |
| 21 | |
| 22 | namespace llvm { |
| 23 | class BitVector; |
| 24 | } |
| 25 | |
| 26 | namespace clang { |
| 27 | class AnalysisDeclContext; |
| 28 | class CFGBlock; |
| 29 | class Preprocessor; |
| 30 | } |
| 31 | |
| 32 | //===----------------------------------------------------------------------===// |
| 33 | // API. |
| 34 | //===----------------------------------------------------------------------===// |
| 35 | |
| 36 | namespace clang { |
| 37 | namespace reachable_code { |
| 38 | |
| 39 | /// Classifications of unreachable code. |
| 40 | enum UnreachableKind { |
| 41 | UK_Return, |
| 42 | UK_Break, |
| 43 | UK_Loop_Increment, |
| 44 | UK_Other |
| 45 | }; |
| 46 | |
| 47 | class Callback { |
| 48 | virtual void anchor(); |
| 49 | public: |
| 50 | virtual ~Callback() {} |
| 51 | virtual void HandleUnreachable(UnreachableKind UK, |
| 52 | SourceLocation L, |
| 53 | SourceRange ConditionVal, |
| 54 | SourceRange R1, |
| 55 | SourceRange R2) = 0; |
| 56 | }; |
| 57 | |
| 58 | /// ScanReachableFromBlock - Mark all blocks reachable from Start. |
| 59 | /// Returns the total number of blocks that were marked reachable. |
| 60 | unsigned ScanReachableFromBlock(const CFGBlock *Start, |
| 61 | llvm::BitVector &Reachable); |
| 62 | |
| 63 | void FindUnreachableCode(AnalysisDeclContext &AC, Preprocessor &PP, |
| 64 | Callback &CB); |
| 65 | |
| 66 | }} // end namespace clang::reachable_code |
| 67 | |
| 68 | #endif |
| 69 |