CheckerManager.h revision 96479da6ad9d921d875e7be29fe1bfa127be8069 
1//===--- CheckerManager.h - Static Analyzer Checker Manager -----*- 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// Defines the Static Analyzer Checker Manager.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_CLANG_SA_CORE_CHECKERMANAGER_H
15#define LLVM_CLANG_SA_CORE_CHECKERMANAGER_H
16
17#include "clang/Basic/LangOptions.h"
18#include "llvm/ADT/SmallVector.h"
19#include "llvm/ADT/DenseMap.h"
20#include "llvm/ADT/FoldingSet.h"
21#include "clang/StaticAnalyzer/Core/PathSensitive/Store.h"
22#include "clang/Analysis/ProgramPoint.h"
23#include <vector>
24
25namespace clang {
26  class Decl;
27  class Stmt;
28  class CallExpr;
29
30namespace ento {
31  class CheckerBase;
32  class ExprEngine;
33  class AnalysisManager;
34  class BugReporter;
35  class CheckerContext;
36  class SimpleCall;
37  class ObjCMethodCall;
38  class SVal;
39  class ExplodedNode;
40  class ExplodedNodeSet;
41  class ExplodedGraph;
42  class ProgramState;
43  class NodeBuilder;
44  struct NodeBuilderContext;
45  class MemRegion;
46  class SymbolReaper;
47
48template <typename T> class CheckerFn;
49
50template <typename RET, typename P1, typename P2, typename P3, typename P4,
51          typename P5>
52class CheckerFn<RET(P1, P2, P3, P4, P5)> {
53  typedef RET (*Func)(void *, P1, P2, P3, P4, P5);
54  Func Fn;
55public:
56  CheckerBase *Checker;
57  CheckerFn(CheckerBase *checker, Func fn) : Fn(fn), Checker(checker) { }
58  RET operator()(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) const {
59    return Fn(Checker, p1, p2, p3, p4, p5);
60  }
61};
62
63template <typename RET, typename P1, typename P2, typename P3, typename P4>
64class CheckerFn<RET(P1, P2, P3, P4)> {
65  typedef RET (*Func)(void *, P1, P2, P3, P4);
66  Func Fn;
67public:
68  CheckerBase *Checker;
69  CheckerFn(CheckerBase *checker, Func fn) : Fn(fn), Checker(checker) { }
70  RET operator()(P1 p1, P2 p2, P3 p3, P4 p4) const {
71    return Fn(Checker, p1, p2, p3, p4);
72  }
73};
74
75template <typename RET, typename P1, typename P2, typename P3>
76class CheckerFn<RET(P1, P2, P3)> {
77  typedef RET (*Func)(void *, P1, P2, P3);
78  Func Fn;
79public:
80  CheckerBase *Checker;
81  CheckerFn(CheckerBase *checker, Func fn) : Fn(fn), Checker(checker) { }
82  RET operator()(P1 p1, P2 p2, P3 p3) const { return Fn(Checker, p1, p2, p3); }
83};
84
85template <typename RET, typename P1, typename P2>
86class CheckerFn<RET(P1, P2)> {
87  typedef RET (*Func)(void *, P1, P2);
88  Func Fn;
89public:
90  CheckerBase *Checker;
91  CheckerFn(CheckerBase *checker, Func fn) : Fn(fn), Checker(checker) { }
92  RET operator()(P1 p1, P2 p2) const { return Fn(Checker, p1, p2); }
93};
94
95template <typename RET, typename P1>
96class CheckerFn<RET(P1)> {
97  typedef RET (*Func)(void *, P1);
98  Func Fn;
99public:
100  CheckerBase *Checker;
101  CheckerFn(CheckerBase *checker, Func fn) : Fn(fn), Checker(checker) { }
102  RET operator()(P1 p1) const { return Fn(Checker, p1); }
103};
104
105template <typename RET>
106class CheckerFn<RET()> {
107  typedef RET (*Func)(void *);
108  Func Fn;
109public:
110  CheckerBase *Checker;
111  CheckerFn(CheckerBase *checker, Func fn) : Fn(fn), Checker(checker) { }
112  RET operator()() const { return Fn(Checker); }
113};
114
115class CheckerManager {
116  const LangOptions LangOpts;
117
118public:
119  CheckerManager(const LangOptions &langOpts) : LangOpts(langOpts) { }
120  ~CheckerManager();
121
122  bool hasPathSensitiveCheckers() const;
123
124  void finishedCheckerRegistration();
125
126  const LangOptions &getLangOpts() const { return LangOpts; }
127
128  typedef CheckerBase *CheckerRef;
129  typedef const void *CheckerTag;
130  typedef CheckerFn<void ()> CheckerDtor;
131
132//===----------------------------------------------------------------------===//
133// registerChecker
134//===----------------------------------------------------------------------===//
135
136  /// \brief Used to register checkers.
137  ///
138  /// \returns a pointer to the checker object.
139  template <typename CHECKER>
140  CHECKER *registerChecker() {
141    CheckerTag tag = getTag<CHECKER>();
142    CheckerRef &ref = CheckerTags[tag];
143    if (ref)
144      return static_cast<CHECKER *>(ref); // already registered.
145
146    CHECKER *checker = new CHECKER();
147    CheckerDtors.push_back(CheckerDtor(checker, destruct<CHECKER>));
148    CHECKER::_register(checker, *this);
149    ref = checker;
150    return checker;
151  }
152
153//===----------------------------------------------------------------------===//
154// Functions for running checkers for AST traversing..
155//===----------------------------------------------------------------------===//
156
157  /// \brief Run checkers handling Decls.
158  void runCheckersOnASTDecl(const Decl *D, AnalysisManager& mgr,
159                            BugReporter &BR);
160
161  /// \brief Run checkers handling Decls containing a Stmt body.
162  void runCheckersOnASTBody(const Decl *D, AnalysisManager& mgr,
163                            BugReporter &BR);
164
165//===----------------------------------------------------------------------===//
166// Functions for running checkers for path-sensitive checking.
167//===----------------------------------------------------------------------===//
168
169  /// \brief Run checkers for pre-visiting Stmts.
170  ///
171  /// The notification is performed for every explored CFGElement, which does
172  /// not include the control flow statements such as IfStmt.
173  ///
174  /// \sa runCheckersForBranchCondition, runCheckersForPostStmt
175  void runCheckersForPreStmt(ExplodedNodeSet &Dst,
176                             const ExplodedNodeSet &Src,
177                             const Stmt *S,
178                             ExprEngine &Eng) {
179    runCheckersForStmt(/*isPreVisit=*/true, Dst, Src, S, Eng);
180  }
181
182  /// \brief Run checkers for post-visiting Stmts.
183  ///
184  /// The notification is performed for every explored CFGElement, which does
185  /// not include the control flow statements such as IfStmt.
186  ///
187  /// \sa runCheckersForBranchCondition, runCheckersForPreStmt
188  void runCheckersForPostStmt(ExplodedNodeSet &Dst,
189                              const ExplodedNodeSet &Src,
190                              const Stmt *S,
191                              ExprEngine &Eng,
192                              bool wasInlined = false) {
193    runCheckersForStmt(/*isPreVisit=*/false, Dst, Src, S, Eng, wasInlined);
194  }
195
196  /// \brief Run checkers for visiting Stmts.
197  void runCheckersForStmt(bool isPreVisit,
198                          ExplodedNodeSet &Dst, const ExplodedNodeSet &Src,
199                          const Stmt *S, ExprEngine &Eng,
200                          bool wasInlined = false);
201
202  /// \brief Run checkers for pre-visiting obj-c messages.
203  void runCheckersForPreObjCMessage(ExplodedNodeSet &Dst,
204                                    const ExplodedNodeSet &Src,
205                                    const ObjCMethodCall &msg,
206                                    ExprEngine &Eng) {
207    runCheckersForObjCMessage(/*isPreVisit=*/true, Dst, Src, msg, Eng);
208  }
209
210  /// \brief Run checkers for post-visiting obj-c messages.
211  void runCheckersForPostObjCMessage(ExplodedNodeSet &Dst,
212                                     const ExplodedNodeSet &Src,
213                                     const ObjCMethodCall &msg,
214                                     ExprEngine &Eng) {
215    runCheckersForObjCMessage(/*isPreVisit=*/false, Dst, Src, msg, Eng);
216  }
217
218  /// \brief Run checkers for visiting obj-c messages.
219  void runCheckersForObjCMessage(bool isPreVisit,
220                                 ExplodedNodeSet &Dst,
221                                 const ExplodedNodeSet &Src,
222                                 const ObjCMethodCall &msg, ExprEngine &Eng);
223
224  /// \brief Run checkers for pre-visiting obj-c messages.
225  void runCheckersForPreCall(ExplodedNodeSet &Dst, const ExplodedNodeSet &Src,
226                             const CallEvent &Call, ExprEngine &Eng) {
227    runCheckersForCallEvent(/*isPreVisit=*/true, Dst, Src, Call, Eng);
228  }
229
230  /// \brief Run checkers for post-visiting obj-c messages.
231  void runCheckersForPostCall(ExplodedNodeSet &Dst, const ExplodedNodeSet &Src,
232                              const CallEvent &Call, ExprEngine &Eng) {
233    runCheckersForCallEvent(/*isPreVisit=*/false, Dst, Src, Call, Eng);
234  }
235
236  /// \brief Run checkers for visiting obj-c messages.
237  void runCheckersForCallEvent(bool isPreVisit, ExplodedNodeSet &Dst,
238                               const ExplodedNodeSet &Src,
239                               const CallEvent &Call, ExprEngine &Eng);
240
241  /// \brief Run checkers for load/store of a location.
242  void runCheckersForLocation(ExplodedNodeSet &Dst,
243                              const ExplodedNodeSet &Src,
244                              SVal location,
245                              bool isLoad,
246                              const Stmt *NodeEx,
247                              const Stmt *BoundEx,
248                              ExprEngine &Eng);
249
250  /// \brief Run checkers for binding of a value to a location.
251  void runCheckersForBind(ExplodedNodeSet &Dst,
252                          const ExplodedNodeSet &Src,
253                          SVal location, SVal val,
254                          const Stmt *S, ExprEngine &Eng,
255                          ProgramPoint::Kind PointKind);
256
257  /// \brief Run checkers for end of analysis.
258  void runCheckersForEndAnalysis(ExplodedGraph &G, BugReporter &BR,
259                                 ExprEngine &Eng);
260
261  /// \brief Run checkers for end of path.
262  void runCheckersForEndPath(NodeBuilderContext &BC,
263                             ExplodedNodeSet &Dst,
264                             ExprEngine &Eng);
265
266  /// \brief Run checkers for branch condition.
267  void runCheckersForBranchCondition(const Stmt *condition,
268                                     ExplodedNodeSet &Dst, ExplodedNode *Pred,
269                                     ExprEngine &Eng);
270
271  /// \brief Run checkers for live symbols.
272  ///
273  /// Allows modifying SymbolReaper object. For example, checkers can explicitly
274  /// register symbols of interest as live. These symbols will not be marked
275  /// dead and removed.
276  void runCheckersForLiveSymbols(ProgramStateRef state,
277                                 SymbolReaper &SymReaper);
278
279  /// \brief Run checkers for dead symbols.
280  ///
281  /// Notifies checkers when symbols become dead. For example, this allows
282  /// checkers to aggressively clean up/reduce the checker state and produce
283  /// precise diagnostics.
284  void runCheckersForDeadSymbols(ExplodedNodeSet &Dst,
285                                 const ExplodedNodeSet &Src,
286                                 SymbolReaper &SymReaper, const Stmt *S,
287                                 ExprEngine &Eng,
288                                 ProgramPoint::Kind K);
289
290  /// \brief True if at least one checker wants to check region changes.
291  bool wantsRegionChangeUpdate(ProgramStateRef state);
292
293  /// \brief Run checkers for region changes.
294  ///
295  /// This corresponds to the check::RegionChanges callback.
296  /// \param state The current program state.
297  /// \param invalidated A set of all symbols potentially touched by the change.
298  /// \param ExplicitRegions The regions explicitly requested for invalidation.
299  ///   For example, in the case of a function call, these would be arguments.
300  /// \param Regions The transitive closure of accessible regions,
301  ///   i.e. all regions that may have been touched by this change.
302  /// \param Call The call expression wrapper if the regions are invalidated
303  ///   by a call.
304  ProgramStateRef
305  runCheckersForRegionChanges(ProgramStateRef state,
306                            const StoreManager::InvalidatedSymbols *invalidated,
307                              ArrayRef<const MemRegion *> ExplicitRegions,
308                              ArrayRef<const MemRegion *> Regions,
309                              const CallEvent *Call);
310
311  /// \brief Run checkers for handling assumptions on symbolic values.
312  ProgramStateRef runCheckersForEvalAssume(ProgramStateRef state,
313                                               SVal Cond, bool Assumption);
314
315  /// \brief Run checkers for evaluating a call.
316  void runCheckersForEvalCall(ExplodedNodeSet &Dst,
317                              const ExplodedNodeSet &Src,
318                              const SimpleCall &CE, ExprEngine &Eng);
319
320  /// \brief Run checkers for the entire Translation Unit.
321  void runCheckersOnEndOfTranslationUnit(const TranslationUnitDecl *TU,
322                                         AnalysisManager &mgr,
323                                         BugReporter &BR);
324
325  /// \brief Run checkers for debug-printing a ProgramState.
326  ///
327  /// Unlike most other callbacks, any checker can simply implement the virtual
328  /// method CheckerBase::printState if it has custom data to print.
329  /// \param Out The output stream
330  /// \param State The state being printed
331  /// \param NL The preferred representation of a newline.
332  /// \param Sep The preferred separator between different kinds of data.
333  void runCheckersForPrintState(raw_ostream &Out, ProgramStateRef State,
334                                const char *NL, const char *Sep);
335
336//===----------------------------------------------------------------------===//
337// Internal registration functions for AST traversing.
338//===----------------------------------------------------------------------===//
339
340  // Functions used by the registration mechanism, checkers should not touch
341  // these directly.
342
343  typedef CheckerFn<void (const Decl *, AnalysisManager&, BugReporter &)>
344      CheckDeclFunc;
345
346  typedef bool (*HandlesDeclFunc)(const Decl *D);
347  void _registerForDecl(CheckDeclFunc checkfn, HandlesDeclFunc isForDeclFn);
348
349  void _registerForBody(CheckDeclFunc checkfn);
350
351//===----------------------------------------------------------------------===//
352// Internal registration functions for path-sensitive checking.
353//===----------------------------------------------------------------------===//
354
355  typedef CheckerFn<void (const Stmt *, CheckerContext &)> CheckStmtFunc;
356
357  typedef CheckerFn<void (const ObjCMethodCall &, CheckerContext &)>
358      CheckObjCMessageFunc;
359
360  typedef CheckerFn<void (const CallEvent &, CheckerContext &)>
361      CheckCallFunc;
362
363  typedef CheckerFn<void (const SVal &location, bool isLoad,
364                          const Stmt *S,
365                          CheckerContext &)>
366      CheckLocationFunc;
367
368  typedef CheckerFn<void (const SVal &location, const SVal &val,
369                          const Stmt *S, CheckerContext &)>
370      CheckBindFunc;
371
372  typedef CheckerFn<void (ExplodedGraph &, BugReporter &, ExprEngine &)>
373      CheckEndAnalysisFunc;
374
375  typedef CheckerFn<void (CheckerContext &)>
376      CheckEndPathFunc;
377
378  typedef CheckerFn<void (const Stmt *, CheckerContext &)>
379      CheckBranchConditionFunc;
380
381  typedef CheckerFn<void (SymbolReaper &, CheckerContext &)>
382      CheckDeadSymbolsFunc;
383
384  typedef CheckerFn<void (ProgramStateRef,SymbolReaper &)> CheckLiveSymbolsFunc;
385
386  typedef CheckerFn<ProgramStateRef (ProgramStateRef,
387                                const StoreManager::InvalidatedSymbols *symbols,
388                                ArrayRef<const MemRegion *> ExplicitRegions,
389                                ArrayRef<const MemRegion *> Regions,
390                                const CallEvent *Call)>
391      CheckRegionChangesFunc;
392
393  typedef CheckerFn<bool (ProgramStateRef)> WantsRegionChangeUpdateFunc;
394
395  typedef CheckerFn<ProgramStateRef (ProgramStateRef,
396                                          const SVal &cond, bool assumption)>
397      EvalAssumeFunc;
398
399  typedef CheckerFn<bool (const CallExpr *, CheckerContext &)>
400      EvalCallFunc;
401
402  typedef CheckerFn<bool (const CallExpr *, ExprEngine &Eng,
403                                            ExplodedNode *Pred,
404                                            ExplodedNodeSet &Dst)>
405      InlineCallFunc;
406
407  typedef CheckerFn<void (const TranslationUnitDecl *,
408                          AnalysisManager&, BugReporter &)>
409      CheckEndOfTranslationUnit;
410
411  typedef bool (*HandlesStmtFunc)(const Stmt *D);
412  void _registerForPreStmt(CheckStmtFunc checkfn,
413                           HandlesStmtFunc isForStmtFn);
414  void _registerForPostStmt(CheckStmtFunc checkfn,
415                            HandlesStmtFunc isForStmtFn);
416
417  void _registerForPreObjCMessage(CheckObjCMessageFunc checkfn);
418  void _registerForPostObjCMessage(CheckObjCMessageFunc checkfn);
419
420  void _registerForPreCall(CheckCallFunc checkfn);
421  void _registerForPostCall(CheckCallFunc checkfn);
422
423  void _registerForLocation(CheckLocationFunc checkfn);
424
425  void _registerForBind(CheckBindFunc checkfn);
426
427  void _registerForEndAnalysis(CheckEndAnalysisFunc checkfn);
428
429  void _registerForEndPath(CheckEndPathFunc checkfn);
430
431  void _registerForBranchCondition(CheckBranchConditionFunc checkfn);
432
433  void _registerForLiveSymbols(CheckLiveSymbolsFunc checkfn);
434
435  void _registerForDeadSymbols(CheckDeadSymbolsFunc checkfn);
436
437  void _registerForRegionChanges(CheckRegionChangesFunc checkfn,
438                                 WantsRegionChangeUpdateFunc wantUpdateFn);
439
440  void _registerForEvalAssume(EvalAssumeFunc checkfn);
441
442  void _registerForEvalCall(EvalCallFunc checkfn);
443
444  void _registerForInlineCall(InlineCallFunc checkfn);
445
446  void _registerForEndOfTranslationUnit(CheckEndOfTranslationUnit checkfn);
447
448//===----------------------------------------------------------------------===//
449// Internal registration functions for events.
450//===----------------------------------------------------------------------===//
451
452  typedef void *EventTag;
453  typedef CheckerFn<void (const void *event)> CheckEventFunc;
454
455  template <typename EVENT>
456  void _registerListenerForEvent(CheckEventFunc checkfn) {
457    EventInfo &info = Events[getTag<EVENT>()];
458    info.Checkers.push_back(checkfn);
459  }
460
461  template <typename EVENT>
462  void _registerDispatcherForEvent() {
463    EventInfo &info = Events[getTag<EVENT>()];
464    info.HasDispatcher = true;
465  }
466
467  template <typename EVENT>
468  void _dispatchEvent(const EVENT &event) const {
469    EventsTy::const_iterator I = Events.find(getTag<EVENT>());
470    if (I == Events.end())
471      return;
472    const EventInfo &info = I->second;
473    for (unsigned i = 0, e = info.Checkers.size(); i != e; ++i)
474      info.Checkers[i](&event);
475  }
476
477//===----------------------------------------------------------------------===//
478// Implementation details.
479//===----------------------------------------------------------------------===//
480
481private:
482  template <typename CHECKER>
483  static void destruct(void *obj) { delete static_cast<CHECKER *>(obj); }
484
485  template <typename T>
486  static void *getTag() { static int tag; return &tag; }
487
488  llvm::DenseMap<CheckerTag, CheckerRef> CheckerTags;
489
490  std::vector<CheckerDtor> CheckerDtors;
491
492  struct DeclCheckerInfo {
493    CheckDeclFunc CheckFn;
494    HandlesDeclFunc IsForDeclFn;
495  };
496  std::vector<DeclCheckerInfo> DeclCheckers;
497
498  std::vector<CheckDeclFunc> BodyCheckers;
499
500  typedef SmallVector<CheckDeclFunc, 4> CachedDeclCheckers;
501  typedef llvm::DenseMap<unsigned, CachedDeclCheckers> CachedDeclCheckersMapTy;
502  CachedDeclCheckersMapTy CachedDeclCheckersMap;
503
504  struct StmtCheckerInfo {
505    CheckStmtFunc CheckFn;
506    HandlesStmtFunc IsForStmtFn;
507    bool IsPreVisit;
508  };
509  std::vector<StmtCheckerInfo> StmtCheckers;
510
511  struct CachedStmtCheckersKey {
512    unsigned StmtKind;
513    bool IsPreVisit;
514
515    CachedStmtCheckersKey() : StmtKind(0), IsPreVisit(0) { }
516    CachedStmtCheckersKey(unsigned stmtKind, bool isPreVisit)
517      : StmtKind(stmtKind), IsPreVisit(isPreVisit) { }
518
519    static CachedStmtCheckersKey getSentinel() {
520      return CachedStmtCheckersKey(~0U, 0);
521    }
522    unsigned getHashValue() const {
523      llvm::FoldingSetNodeID ID;
524      ID.AddInteger(StmtKind);
525      ID.AddBoolean(IsPreVisit);
526      return ID.ComputeHash();
527    }
528    bool operator==(const CachedStmtCheckersKey &RHS) const {
529      return StmtKind == RHS.StmtKind && IsPreVisit == RHS.IsPreVisit;
530    }
531  };
532  friend struct llvm::DenseMapInfo<CachedStmtCheckersKey>;
533
534  typedef SmallVector<CheckStmtFunc, 4> CachedStmtCheckers;
535  typedef llvm::DenseMap<CachedStmtCheckersKey, CachedStmtCheckers>
536      CachedStmtCheckersMapTy;
537  CachedStmtCheckersMapTy CachedStmtCheckersMap;
538
539  CachedStmtCheckers *getCachedStmtCheckersFor(const Stmt *S, bool isPreVisit);
540
541  std::vector<CheckObjCMessageFunc> PreObjCMessageCheckers;
542  std::vector<CheckObjCMessageFunc> PostObjCMessageCheckers;
543
544  std::vector<CheckCallFunc> PreCallCheckers;
545  std::vector<CheckCallFunc> PostCallCheckers;
546
547  std::vector<CheckLocationFunc> LocationCheckers;
548
549  std::vector<CheckBindFunc> BindCheckers;
550
551  std::vector<CheckEndAnalysisFunc> EndAnalysisCheckers;
552
553  std::vector<CheckEndPathFunc> EndPathCheckers;
554
555  std::vector<CheckBranchConditionFunc> BranchConditionCheckers;
556
557  std::vector<CheckLiveSymbolsFunc> LiveSymbolsCheckers;
558
559  std::vector<CheckDeadSymbolsFunc> DeadSymbolsCheckers;
560
561  struct RegionChangesCheckerInfo {
562    CheckRegionChangesFunc CheckFn;
563    WantsRegionChangeUpdateFunc WantUpdateFn;
564  };
565  std::vector<RegionChangesCheckerInfo> RegionChangesCheckers;
566
567  std::vector<EvalAssumeFunc> EvalAssumeCheckers;
568
569  std::vector<EvalCallFunc> EvalCallCheckers;
570
571  std::vector<InlineCallFunc> InlineCallCheckers;
572
573  std::vector<CheckEndOfTranslationUnit> EndOfTranslationUnitCheckers;
574
575  struct EventInfo {
576    SmallVector<CheckEventFunc, 4> Checkers;
577    bool HasDispatcher;
578    EventInfo() : HasDispatcher(false) { }
579  };
580
581  typedef llvm::DenseMap<EventTag, EventInfo> EventsTy;
582  EventsTy Events;
583};
584
585} // end ento namespace
586
587} // end clang namespace
588
589namespace llvm {
590  /// Define DenseMapInfo so that CachedStmtCheckersKey can be used as key
591  /// in DenseMap and DenseSets.
592  template <>
593  struct DenseMapInfo<clang::ento::CheckerManager::CachedStmtCheckersKey> {
594    static inline clang::ento::CheckerManager::CachedStmtCheckersKey
595        getEmptyKey() {
596      return clang::ento::CheckerManager::CachedStmtCheckersKey();
597    }
598    static inline clang::ento::CheckerManager::CachedStmtCheckersKey
599        getTombstoneKey() {
600      return clang::ento::CheckerManager::CachedStmtCheckersKey::getSentinel();
601    }
602
603    static unsigned
604        getHashValue(clang::ento::CheckerManager::CachedStmtCheckersKey S) {
605      return S.getHashValue();
606    }
607
608    static bool isEqual(clang::ento::CheckerManager::CachedStmtCheckersKey LHS,
609                       clang::ento::CheckerManager::CachedStmtCheckersKey RHS) {
610      return LHS == RHS;
611    }
612  };
613} // end namespace llvm
614
615#endif
616