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
22namespace llvm {
23 class BitVector;
24}
25
26namespace clang {
27 class AnalysisDeclContext;
28 class CFGBlock;
29 class Preprocessor;
30}
31
32//===----------------------------------------------------------------------===//
33// API.
34//===----------------------------------------------------------------------===//
35
36namespace clang {
37namespace reachable_code {
38
39/// Classifications of unreachable code.
40enum UnreachableKind {
41 UK_Return,
42 UK_Break,
43 UK_Loop_Increment,
44 UK_Other
45};
46
47class Callback {
48 virtual void anchor();
49public:
50 virtual ~Callback() {}
51 virtual void HandleUnreachable(UnreachableKind UK, SourceLocation L,
52 SourceRange ConditionVal, SourceRange R1,
53 SourceRange R2, bool HasFallThroughAttr) = 0;
54};
55
56/// ScanReachableFromBlock - Mark all blocks reachable from Start.
57/// Returns the total number of blocks that were marked reachable.
58unsigned ScanReachableFromBlock(const CFGBlock *Start,
59 llvm::BitVector &Reachable);
60
61void FindUnreachableCode(AnalysisDeclContext &AC, Preprocessor &PP,
62 Callback &CB);
63
64}} // end namespace clang::reachable_code
65
66#endif
67

source code of clang/include/clang/Analysis/Analyses/ReachableCode.h