CheckerManager.cpp revision 769ce3e93ad35bd9ac28e4d8b8f035ae4fd9a5b5 
1//===--- CheckerManager.cpp - Static Analyzer Checker Manager -------------===//
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#include "clang/StaticAnalyzer/Core/CheckerManager.h"
15#include "clang/StaticAnalyzer/Core/CheckerProvider.h"
16#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
17#include "clang/Analysis/ProgramPoint.h"
18#include "clang/AST/DeclBase.h"
19
20using namespace clang;
21using namespace ento;
22
23//===----------------------------------------------------------------------===//
24// Functions for running checkers for AST traversing..
25//===----------------------------------------------------------------------===//
26
27void CheckerManager::runCheckersOnASTDecl(const Decl *D, AnalysisManager& mgr,
28                                          BugReporter &BR) {
29  assert(D);
30
31  unsigned DeclKind = D->getKind();
32  CachedDeclCheckers *checkers = 0;
33  CachedDeclCheckersMapTy::iterator CCI = CachedDeclCheckersMap.find(DeclKind);
34  if (CCI != CachedDeclCheckersMap.end()) {
35    checkers = &(CCI->second);
36  } else {
37    // Find the checkers that should run for this Decl and cache them.
38    checkers = &CachedDeclCheckersMap[DeclKind];
39    for (unsigned i = 0, e = DeclCheckers.size(); i != e; ++i) {
40      DeclCheckerInfo &info = DeclCheckers[i];
41      if (info.IsForDeclFn(D))
42        checkers->push_back(info.CheckFn);
43    }
44  }
45
46  assert(checkers);
47  for (CachedDeclCheckers::iterator
48         I = checkers->begin(), E = checkers->end(); I != E; ++I)
49    (*I)(D, mgr, BR);
50}
51
52void CheckerManager::runCheckersOnASTBody(const Decl *D, AnalysisManager& mgr,
53                                          BugReporter &BR) {
54  assert(D && D->hasBody());
55
56  for (unsigned i = 0, e = BodyCheckers.size(); i != e; ++i)
57    BodyCheckers[i](D, mgr, BR);
58}
59
60//===----------------------------------------------------------------------===//
61// Functions for running checkers for path-sensitive checking.
62//===----------------------------------------------------------------------===//
63
64template <typename CHECK_CTX>
65static void runPathSensitiveCheckers(CHECK_CTX checkCtx,
66                                     ExplodedNodeSet &Dst,
67                                     ExplodedNodeSet &Src) {
68
69  if (checkCtx.Checkers.empty()) {
70    Dst.insert(Src);
71    return;
72  }
73
74  ExplodedNodeSet Tmp;
75  ExplodedNodeSet *PrevSet = &Src;
76
77  for (typename CHECK_CTX::CheckersTy::const_iterator
78         I= checkCtx.Checkers.begin(), E= checkCtx.Checkers.end(); I!=E; ++I) {
79    ExplodedNodeSet *CurrSet = 0;
80    if (I+1 == E)
81      CurrSet = &Dst;
82    else {
83      CurrSet = (PrevSet == &Tmp) ? &Src : &Tmp;
84      CurrSet->clear();
85    }
86
87    for (ExplodedNodeSet::iterator NI = PrevSet->begin(), NE = PrevSet->end();
88         NI != NE; ++NI)
89      checkCtx.runChecker(*I, *CurrSet, *NI);
90
91    // Update which NodeSet is the current one.
92    PrevSet = CurrSet;
93  }
94}
95
96namespace {
97  struct CheckStmtContext {
98    typedef llvm::SmallVectorImpl<CheckerManager::CheckStmtFunc> CheckersTy;
99    bool IsPreVisit;
100    const CheckersTy &Checkers;
101    const Stmt *S;
102    ExprEngine &Eng;
103
104    CheckStmtContext(bool isPreVisit, const CheckersTy &checkers,
105                     const Stmt *s, ExprEngine &eng)
106      : IsPreVisit(isPreVisit), Checkers(checkers), S(s), Eng(eng) { }
107
108    void runChecker(CheckerManager::CheckStmtFunc checkFn,
109                    ExplodedNodeSet &Dst, ExplodedNode *Pred) {
110      // FIXME: Remove respondsToCallback from CheckerContext;
111      CheckerContext C(Dst, Eng.getBuilder(), Eng, Pred, checkFn.Checker,
112                       IsPreVisit ? ProgramPoint::PreStmtKind :
113                                    ProgramPoint::PostStmtKind, 0, S);
114      checkFn(S, C);
115    }
116  };
117}
118
119/// \brief Run checkers for visiting Stmts.
120void CheckerManager::runCheckersForStmt(bool isPreVisit,
121                                        ExplodedNodeSet &Dst,
122                                        ExplodedNodeSet &Src,
123                                        const Stmt *S,
124                                        ExprEngine &Eng) {
125  CheckStmtContext C(isPreVisit, *getCachedStmtCheckersFor(S, isPreVisit),
126                     S, Eng);
127  runPathSensitiveCheckers(C, Dst, Src);
128}
129
130namespace {
131  struct CheckObjCMessageContext {
132    typedef std::vector<CheckerManager::CheckObjCMessageFunc> CheckersTy;
133    bool IsPreVisit;
134    const CheckersTy &Checkers;
135    const ObjCMessage &Msg;
136    ExprEngine &Eng;
137
138    CheckObjCMessageContext(bool isPreVisit, const CheckersTy &checkers,
139                            const ObjCMessage &msg, ExprEngine &eng)
140      : IsPreVisit(isPreVisit), Checkers(checkers), Msg(msg), Eng(eng) { }
141
142    void runChecker(CheckerManager::CheckObjCMessageFunc checkFn,
143                    ExplodedNodeSet &Dst, ExplodedNode *Pred) {
144      CheckerContext C(Dst, Eng.getBuilder(), Eng, Pred, checkFn.Checker,
145                       IsPreVisit ? ProgramPoint::PreStmtKind :
146                                    ProgramPoint::PostStmtKind, 0,
147                       Msg.getOriginExpr());
148      checkFn(Msg, C);
149    }
150  };
151}
152
153/// \brief Run checkers for visiting obj-c messages.
154void CheckerManager::runCheckersForObjCMessage(bool isPreVisit,
155                                               ExplodedNodeSet &Dst,
156                                               ExplodedNodeSet &Src,
157                                               const ObjCMessage &msg,
158                                               ExprEngine &Eng) {
159  CheckObjCMessageContext C(isPreVisit, PostObjCMessageCheckers, msg, Eng);
160  runPathSensitiveCheckers(C, Dst, Src);
161}
162
163namespace {
164  struct CheckLocationContext {
165    typedef std::vector<CheckerManager::CheckLocationFunc> CheckersTy;
166    const CheckersTy &Checkers;
167    SVal Loc;
168    bool IsLoad;
169    const Stmt *S;
170    const GRState *State;
171    ExprEngine &Eng;
172
173    CheckLocationContext(const CheckersTy &checkers,
174                         SVal loc, bool isLoad, const Stmt *s,
175                         const GRState *state, ExprEngine &eng)
176      : Checkers(checkers), Loc(loc), IsLoad(isLoad), S(s),
177        State(state), Eng(eng) { }
178
179    void runChecker(CheckerManager::CheckLocationFunc checkFn,
180                    ExplodedNodeSet &Dst, ExplodedNode *Pred) {
181      CheckerContext C(Dst, Eng.getBuilder(), Eng, Pred, checkFn.Checker,
182                       IsLoad ? ProgramPoint::PreLoadKind :
183                       ProgramPoint::PreStoreKind, 0, S, State);
184      checkFn(Loc, IsLoad, C);
185    }
186  };
187}
188
189/// \brief Run checkers for load/store of a location.
190void CheckerManager::runCheckersForLocation(ExplodedNodeSet &Dst,
191                                            ExplodedNodeSet &Src,
192                                            SVal location, bool isLoad,
193                                            const Stmt *S,
194                                            const GRState *state,
195                                            ExprEngine &Eng) {
196  CheckLocationContext C(LocationCheckers, location, isLoad, S, state, Eng);
197  runPathSensitiveCheckers(C, Dst, Src);
198}
199
200void CheckerManager::registerCheckersToEngine(ExprEngine &eng) {
201  for (unsigned i = 0, e = Funcs.size(); i != e; ++i)
202    Funcs[i](eng);
203}
204
205//===----------------------------------------------------------------------===//
206// Internal registration functions for AST traversing.
207//===----------------------------------------------------------------------===//
208
209void CheckerManager::_registerForDecl(CheckDeclFunc checkfn,
210                                      HandlesDeclFunc isForDeclFn) {
211  DeclCheckerInfo info = { checkfn, isForDeclFn };
212  DeclCheckers.push_back(info);
213}
214
215void CheckerManager::_registerForBody(CheckDeclFunc checkfn) {
216  BodyCheckers.push_back(checkfn);
217}
218
219//===----------------------------------------------------------------------===//
220// Internal registration functions for path-sensitive checking.
221//===----------------------------------------------------------------------===//
222
223void CheckerManager::_registerForPreStmt(CheckStmtFunc checkfn,
224                                         HandlesStmtFunc isForStmtFn) {
225  StmtCheckerInfo info = { checkfn, isForStmtFn, /*IsPreVisit*/true };
226  StmtCheckers.push_back(info);
227}
228void CheckerManager::_registerForPostStmt(CheckStmtFunc checkfn,
229                                          HandlesStmtFunc isForStmtFn) {
230  StmtCheckerInfo info = { checkfn, isForStmtFn, /*IsPreVisit*/false };
231  StmtCheckers.push_back(info);
232}
233
234void CheckerManager::_registerForPreObjCMessage(CheckObjCMessageFunc checkfn) {
235  PreObjCMessageCheckers.push_back(checkfn);
236}
237void CheckerManager::_registerForPostObjCMessage(CheckObjCMessageFunc checkfn) {
238  PostObjCMessageCheckers.push_back(checkfn);
239}
240
241void CheckerManager::_registerForLocation(CheckLocationFunc checkfn) {
242  LocationCheckers.push_back(checkfn);
243}
244
245//===----------------------------------------------------------------------===//
246// Implementation details.
247//===----------------------------------------------------------------------===//
248
249CheckerManager::CachedStmtCheckers *
250CheckerManager::getCachedStmtCheckersFor(const Stmt *S, bool isPreVisit) {
251  assert(S);
252
253  CachedStmtCheckersKey key(S->getStmtClass(), isPreVisit);
254  CachedStmtCheckers *checkers = 0;
255  CachedStmtCheckersMapTy::iterator CCI = CachedStmtCheckersMap.find(key);
256  if (CCI != CachedStmtCheckersMap.end()) {
257    checkers = &(CCI->second);
258  } else {
259    // Find the checkers that should run for this Stmt and cache them.
260    checkers = &CachedStmtCheckersMap[key];
261    for (unsigned i = 0, e = StmtCheckers.size(); i != e; ++i) {
262      StmtCheckerInfo &info = StmtCheckers[i];
263      if (info.IsPreVisit == isPreVisit && info.IsForStmtFn(S))
264        checkers->push_back(info.CheckFn);
265    }
266  }
267
268  assert(checkers);
269  return checkers;
270}
271
272CheckerManager::~CheckerManager() {
273  for (unsigned i = 0, e = CheckerDtors.size(); i != e; ++i)
274    CheckerDtors[i]();
275}
276
277// Anchor for the vtable.
278CheckerProvider::~CheckerProvider() { }
279