clang  9.0.0svn
ReachableCode.h
Go to the documentation of this file.
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 
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.
45 };
46 
47 class Callback {
48  virtual void anchor();
49 public:
50  virtual ~Callback() {}
51  virtual void HandleUnreachable(UnreachableKind UK,
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 
64  Callback &CB);
65 
66 }} // end namespace clang::reachable_code
67 
68 #endif
DominatorTree GraphTraits specialization so the DominatorTree can be iterable by generic graph iterat...
Definition: Dominators.h:29
AnalysisDeclContext contains the context data for the function or method under analysis.
Represents a single basic block in a source-level CFG.
Definition: CFG.h:551
void FindUnreachableCode(AnalysisDeclContext &AC, Preprocessor &PP, Callback &CB)
unsigned ScanReachableFromBlock(const CFGBlock *Start, llvm::BitVector &Reachable)
ScanReachableFromBlock - Mark all blocks reachable from Start.
Encodes a location in the source.
Dataflow Directional Tag Classes.
UnreachableKind
Classifications of unreachable code.
Definition: ReachableCode.h:40
Defines the clang::SourceLocation class and associated facilities.
A trivial tuple used to represent a source range.
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:123