• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 //=- AnalysisBasedWarnings.h - Sema warnings based on libAnalysis -*- C++ -*-=//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines AnalysisBasedWarnings, a worker object used by Sema
11 // that issues warnings based on dataflow-analysis.
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_CLANG_SEMA_ANALYSISBASEDWARNINGS_H
15 #define LLVM_CLANG_SEMA_ANALYSISBASEDWARNINGS_H
16 
17 #include "llvm/ADT/DenseMap.h"
18 
19 namespace clang {
20 
21 class BlockExpr;
22 class Decl;
23 class FunctionDecl;
24 class ObjCMethodDecl;
25 class QualType;
26 class Sema;
27 namespace sema {
28   class FunctionScopeInfo;
29 }
30 
31 namespace sema {
32 
33 class AnalysisBasedWarnings {
34 public:
35   class Policy {
36     friend class AnalysisBasedWarnings;
37     // The warnings to run.
38     unsigned enableCheckFallThrough : 1;
39     unsigned enableCheckUnreachable : 1;
40     unsigned enableThreadSafetyAnalysis : 1;
41     unsigned enableConsumedAnalysis : 1;
42   public:
43     Policy();
disableCheckFallThrough()44     void disableCheckFallThrough() { enableCheckFallThrough = 0; }
45   };
46 
47 private:
48   Sema &S;
49   Policy DefaultPolicy;
50 
51   enum VisitFlag { NotVisited = 0, Visited = 1, Pending = 2 };
52   llvm::DenseMap<const FunctionDecl*, VisitFlag> VisitedFD;
53 
54   /// \name Statistics
55   /// @{
56 
57   /// \brief Number of function CFGs built and analyzed.
58   unsigned NumFunctionsAnalyzed;
59 
60   /// \brief Number of functions for which the CFG could not be successfully
61   /// built.
62   unsigned NumFunctionsWithBadCFGs;
63 
64   /// \brief Total number of blocks across all CFGs.
65   unsigned NumCFGBlocks;
66 
67   /// \brief Largest number of CFG blocks for a single function analyzed.
68   unsigned MaxCFGBlocksPerFunction;
69 
70   /// \brief Total number of CFGs with variables analyzed for uninitialized
71   /// uses.
72   unsigned NumUninitAnalysisFunctions;
73 
74   /// \brief Total number of variables analyzed for uninitialized uses.
75   unsigned NumUninitAnalysisVariables;
76 
77   /// \brief Max number of variables analyzed for uninitialized uses in a single
78   /// function.
79   unsigned MaxUninitAnalysisVariablesPerFunction;
80 
81   /// \brief Total number of block visits during uninitialized use analysis.
82   unsigned NumUninitAnalysisBlockVisits;
83 
84   /// \brief Max number of block visits during uninitialized use analysis of
85   /// a single function.
86   unsigned MaxUninitAnalysisBlockVisitsPerFunction;
87 
88   /// @}
89 
90 public:
91   AnalysisBasedWarnings(Sema &s);
92 
93   void IssueWarnings(Policy P, FunctionScopeInfo *fscope,
94                      const Decl *D, const BlockExpr *blkExpr);
95 
getDefaultPolicy()96   Policy getDefaultPolicy() { return DefaultPolicy; }
97 
98   void PrintStats() const;
99 };
100 
101 }} // end namespace clang::sema
102 
103 #endif
104