ExprEngine.h revision 9428723d6730f4fd257e15b78d24991ae95bbd84 
1//===-- ExprEngine.h - Path-Sensitive Expression-Level Dataflow ---*- 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 a meta-engine for path-sensitive dataflow analysis that
11//  is built on CoreEngine, but provides the boilerplate to execute transfer
12//  functions and build the ExplodedGraph at the expression level.
13//
14//===----------------------------------------------------------------------===//
15
16#ifndef LLVM_CLANG_GR_EXPRENGINE
17#define LLVM_CLANG_GR_EXPRENGINE
18
19#include "clang/AST/Expr.h"
20#include "clang/AST/Type.h"
21#include "clang/Analysis/DomainSpecific/ObjCNoReturn.h"
22#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h"
23#include "clang/StaticAnalyzer/Core/PathSensitive/AnalysisManager.h"
24#include "clang/StaticAnalyzer/Core/PathSensitive/CoreEngine.h"
25#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h"
26#include "clang/StaticAnalyzer/Core/PathSensitive/ProgramStateTrait.h"
27#include "clang/StaticAnalyzer/Core/PathSensitive/SubEngine.h"
28
29namespace clang {
30
31class AnalysisDeclContextManager;
32class CXXCatchStmt;
33class CXXConstructExpr;
34class CXXDeleteExpr;
35class CXXNewExpr;
36class CXXTemporaryObjectExpr;
37class CXXThisExpr;
38class MaterializeTemporaryExpr;
39class ObjCAtSynchronizedStmt;
40class ObjCForCollectionStmt;
41
42namespace ento {
43
44class AnalysisManager;
45class CallEvent;
46class SimpleCall;
47
48class ExprEngine : public SubEngine {
49  AnalysisManager &AMgr;
50
51  AnalysisDeclContextManager &AnalysisDeclContexts;
52
53  CoreEngine Engine;
54
55  /// G - the simulation graph.
56  ExplodedGraph& G;
57
58  /// StateMgr - Object that manages the data for all created states.
59  ProgramStateManager StateMgr;
60
61  /// SymMgr - Object that manages the symbol information.
62  SymbolManager& SymMgr;
63
64  /// svalBuilder - SValBuilder object that creates SVals from expressions.
65  SValBuilder &svalBuilder;
66
67  unsigned int currStmtIdx;
68  const NodeBuilderContext *currBldrCtx;
69
70  /// Helper object to determine if an Objective-C message expression
71  /// implicitly never returns.
72  ObjCNoReturn ObjCNoRet;
73
74  /// Whether or not GC is enabled in this analysis.
75  bool ObjCGCEnabled;
76
77  /// The BugReporter associated with this engine.  It is important that
78  ///  this object be placed at the very end of member variables so that its
79  ///  destructor is called before the rest of the ExprEngine is destroyed.
80  GRBugReporter BR;
81
82  /// The functions which have been analyzed through inlining. This is owned by
83  /// AnalysisConsumer. It can be null.
84  SetOfConstDecls *VisitedCallees;
85
86public:
87  ExprEngine(AnalysisManager &mgr, bool gcEnabled,
88             SetOfConstDecls *VisitedCalleesIn,
89             FunctionSummariesTy *FS);
90
91  ~ExprEngine();
92
93  /// Returns true if there is still simulation state on the worklist.
94  bool ExecuteWorkList(const LocationContext *L, unsigned Steps = 150000) {
95    return Engine.ExecuteWorkList(L, Steps, 0);
96  }
97
98  /// Execute the work list with an initial state. Nodes that reaches the exit
99  /// of the function are added into the Dst set, which represent the exit
100  /// state of the function call. Returns true if there is still simulation
101  /// state on the worklist.
102  bool ExecuteWorkListWithInitialState(const LocationContext *L, unsigned Steps,
103                                       ProgramStateRef InitState,
104                                       ExplodedNodeSet &Dst) {
105    return Engine.ExecuteWorkListWithInitialState(L, Steps, InitState, Dst);
106  }
107
108  /// getContext - Return the ASTContext associated with this analysis.
109  ASTContext &getContext() const { return AMgr.getASTContext(); }
110
111  virtual AnalysisManager &getAnalysisManager() { return AMgr; }
112
113  CheckerManager &getCheckerManager() const {
114    return *AMgr.getCheckerManager();
115  }
116
117  SValBuilder &getSValBuilder() { return svalBuilder; }
118
119  BugReporter& getBugReporter() { return BR; }
120
121  const NodeBuilderContext &getBuilderContext() {
122    assert(currBldrCtx);
123    return *currBldrCtx;
124  }
125
126  bool isObjCGCEnabled() { return ObjCGCEnabled; }
127
128  const Stmt *getStmt() const;
129
130  void GenerateAutoTransition(ExplodedNode *N);
131  void enqueueEndOfPath(ExplodedNodeSet &S);
132  void GenerateCallExitNode(ExplodedNode *N);
133
134  /// ViewGraph - Visualize the ExplodedGraph created by executing the
135  ///  simulation.
136  void ViewGraph(bool trim = false);
137
138  void ViewGraph(ExplodedNode** Beg, ExplodedNode** End);
139
140  /// getInitialState - Return the initial state used for the root vertex
141  ///  in the ExplodedGraph.
142  ProgramStateRef getInitialState(const LocationContext *InitLoc);
143
144  ExplodedGraph& getGraph() { return G; }
145  const ExplodedGraph& getGraph() const { return G; }
146
147  /// \brief Run the analyzer's garbage collection - remove dead symbols and
148  /// bindings from the state.
149  ///
150  /// Checkers can participate in this process with two callbacks:
151  /// \c checkLiveSymbols and \c checkDeadSymbols. See the CheckerDocumentation
152  /// class for more information.
153  ///
154  /// \param Node The predecessor node, from which the processing should start.
155  /// \param Out The returned set of output nodes.
156  /// \param ReferenceStmt The statement which is about to be processed.
157  ///        Everything needed for this statement should be considered live.
158  ///        A null statement means that everything in child LocationContexts
159  ///        is dead.
160  /// \param LC The location context of the \p ReferenceStmt. A null location
161  ///        context means that we have reached the end of analysis and that
162  ///        all statements and local variables should be considered dead.
163  /// \param DiagnosticStmt Used as a location for any warnings that should
164  ///        occur while removing the dead (e.g. leaks). By default, the
165  ///        \p ReferenceStmt is used.
166  /// \param K Denotes whether this is a pre- or post-statement purge. This
167  ///        must only be ProgramPoint::PostStmtPurgeDeadSymbolsKind if an
168  ///        entire location context is being cleared, in which case the
169  ///        \p ReferenceStmt must either be a ReturnStmt or \c NULL. Otherwise,
170  ///        it must be ProgramPoint::PreStmtPurgeDeadSymbolsKind (the default)
171  ///        and \p ReferenceStmt must be valid (non-null).
172  void removeDead(ExplodedNode *Node, ExplodedNodeSet &Out,
173            const Stmt *ReferenceStmt, const LocationContext *LC,
174            const Stmt *DiagnosticStmt = 0,
175            ProgramPoint::Kind K = ProgramPoint::PreStmtPurgeDeadSymbolsKind);
176
177  /// processCFGElement - Called by CoreEngine. Used to generate new successor
178  ///  nodes by processing the 'effects' of a CFG element.
179  void processCFGElement(const CFGElement E, ExplodedNode *Pred,
180                         unsigned StmtIdx, NodeBuilderContext *Ctx);
181
182  void ProcessStmt(const CFGStmt S, ExplodedNode *Pred);
183
184  void ProcessInitializer(const CFGInitializer I, ExplodedNode *Pred);
185
186  void ProcessImplicitDtor(const CFGImplicitDtor D, ExplodedNode *Pred);
187
188  void ProcessAutomaticObjDtor(const CFGAutomaticObjDtor D,
189                               ExplodedNode *Pred, ExplodedNodeSet &Dst);
190  void ProcessBaseDtor(const CFGBaseDtor D,
191                       ExplodedNode *Pred, ExplodedNodeSet &Dst);
192  void ProcessMemberDtor(const CFGMemberDtor D,
193                         ExplodedNode *Pred, ExplodedNodeSet &Dst);
194  void ProcessTemporaryDtor(const CFGTemporaryDtor D,
195                            ExplodedNode *Pred, ExplodedNodeSet &Dst);
196
197  /// Called by CoreEngine when processing the entrance of a CFGBlock.
198  virtual void processCFGBlockEntrance(const BlockEdge &L,
199                                       NodeBuilderWithSinks &nodeBuilder,
200                                       ExplodedNode *Pred);
201
202  /// ProcessBranch - Called by CoreEngine.  Used to generate successor
203  ///  nodes by processing the 'effects' of a branch condition.
204  void processBranch(const Stmt *Condition, const Stmt *Term,
205                     NodeBuilderContext& BuilderCtx,
206                     ExplodedNode *Pred,
207                     ExplodedNodeSet &Dst,
208                     const CFGBlock *DstT,
209                     const CFGBlock *DstF);
210
211  /// processIndirectGoto - Called by CoreEngine.  Used to generate successor
212  ///  nodes by processing the 'effects' of a computed goto jump.
213  void processIndirectGoto(IndirectGotoNodeBuilder& builder);
214
215  /// ProcessSwitch - Called by CoreEngine.  Used to generate successor
216  ///  nodes by processing the 'effects' of a switch statement.
217  void processSwitch(SwitchNodeBuilder& builder);
218
219  /// ProcessEndPath - Called by CoreEngine.  Used to generate end-of-path
220  ///  nodes when the control reaches the end of a function.
221  void processEndOfFunction(NodeBuilderContext& BC,
222                            ExplodedNode *Pred);
223
224  /// Remove dead bindings/symbols before exiting a function.
225  void removeDeadOnEndOfFunction(NodeBuilderContext& BC,
226                                 ExplodedNode *Pred,
227                                 ExplodedNodeSet &Dst);
228
229  /// Generate the entry node of the callee.
230  void processCallEnter(CallEnter CE, ExplodedNode *Pred);
231
232  /// Generate the sequence of nodes that simulate the call exit and the post
233  /// visit for CallExpr.
234  void processCallExit(ExplodedNode *Pred);
235
236  /// Called by CoreEngine when the analysis worklist has terminated.
237  void processEndWorklist(bool hasWorkRemaining);
238
239  /// evalAssume - Callback function invoked by the ConstraintManager when
240  ///  making assumptions about state values.
241  ProgramStateRef processAssume(ProgramStateRef state, SVal cond,bool assumption);
242
243  /// wantsRegionChangeUpdate - Called by ProgramStateManager to determine if a
244  ///  region change should trigger a processRegionChanges update.
245  bool wantsRegionChangeUpdate(ProgramStateRef state);
246
247  /// processRegionChanges - Called by ProgramStateManager whenever a change is made
248  ///  to the store. Used to update checkers that track region values.
249  ProgramStateRef
250  processRegionChanges(ProgramStateRef state,
251                       const StoreManager::InvalidatedSymbols *invalidated,
252                       ArrayRef<const MemRegion *> ExplicitRegions,
253                       ArrayRef<const MemRegion *> Regions,
254                       const CallEvent *Call);
255
256  /// printState - Called by ProgramStateManager to print checker-specific data.
257  void printState(raw_ostream &Out, ProgramStateRef State,
258                  const char *NL, const char *Sep);
259
260  virtual ProgramStateManager& getStateManager() { return StateMgr; }
261
262  StoreManager& getStoreManager() { return StateMgr.getStoreManager(); }
263
264  ConstraintManager& getConstraintManager() {
265    return StateMgr.getConstraintManager();
266  }
267
268  // FIXME: Remove when we migrate over to just using SValBuilder.
269  BasicValueFactory& getBasicVals() {
270    return StateMgr.getBasicVals();
271  }
272
273  // FIXME: Remove when we migrate over to just using ValueManager.
274  SymbolManager& getSymbolManager() { return SymMgr; }
275  const SymbolManager& getSymbolManager() const { return SymMgr; }
276
277  // Functions for external checking of whether we have unfinished work
278  bool wasBlocksExhausted() const { return Engine.wasBlocksExhausted(); }
279  bool hasEmptyWorkList() const { return !Engine.getWorkList()->hasWork(); }
280  bool hasWorkRemaining() const { return Engine.hasWorkRemaining(); }
281
282  const CoreEngine &getCoreEngine() const { return Engine; }
283
284public:
285  /// Visit - Transfer function logic for all statements.  Dispatches to
286  ///  other functions that handle specific kinds of statements.
287  void Visit(const Stmt *S, ExplodedNode *Pred, ExplodedNodeSet &Dst);
288
289  /// VisitArraySubscriptExpr - Transfer function for array accesses.
290  void VisitLvalArraySubscriptExpr(const ArraySubscriptExpr *Ex,
291                                   ExplodedNode *Pred,
292                                   ExplodedNodeSet &Dst);
293
294  /// VisitGCCAsmStmt - Transfer function logic for inline asm.
295  void VisitGCCAsmStmt(const GCCAsmStmt *A, ExplodedNode *Pred,
296                       ExplodedNodeSet &Dst);
297
298  /// VisitMSAsmStmt - Transfer function logic for MS inline asm.
299  void VisitMSAsmStmt(const MSAsmStmt *A, ExplodedNode *Pred,
300                      ExplodedNodeSet &Dst);
301
302  /// VisitBlockExpr - Transfer function logic for BlockExprs.
303  void VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred,
304                      ExplodedNodeSet &Dst);
305
306  /// VisitBinaryOperator - Transfer function logic for binary operators.
307  void VisitBinaryOperator(const BinaryOperator* B, ExplodedNode *Pred,
308                           ExplodedNodeSet &Dst);
309
310
311  /// VisitCall - Transfer function for function calls.
312  void VisitCallExpr(const CallExpr *CE, ExplodedNode *Pred,
313                     ExplodedNodeSet &Dst);
314
315  /// VisitCast - Transfer function logic for all casts (implicit and explicit).
316  void VisitCast(const CastExpr *CastE, const Expr *Ex, ExplodedNode *Pred,
317                ExplodedNodeSet &Dst);
318
319  /// VisitCompoundLiteralExpr - Transfer function logic for compound literals.
320  void VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL,
321                                ExplodedNode *Pred, ExplodedNodeSet &Dst);
322
323  /// Transfer function logic for DeclRefExprs and BlockDeclRefExprs.
324  void VisitCommonDeclRefExpr(const Expr *DR, const NamedDecl *D,
325                              ExplodedNode *Pred, ExplodedNodeSet &Dst);
326
327  /// VisitDeclStmt - Transfer function logic for DeclStmts.
328  void VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred,
329                     ExplodedNodeSet &Dst);
330
331  /// VisitGuardedExpr - Transfer function logic for ?, __builtin_choose
332  void VisitGuardedExpr(const Expr *Ex, const Expr *L, const Expr *R,
333                        ExplodedNode *Pred, ExplodedNodeSet &Dst);
334
335  void VisitInitListExpr(const InitListExpr *E, ExplodedNode *Pred,
336                         ExplodedNodeSet &Dst);
337
338  /// VisitLogicalExpr - Transfer function logic for '&&', '||'
339  void VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred,
340                        ExplodedNodeSet &Dst);
341
342  /// VisitMemberExpr - Transfer function for member expressions.
343  void VisitMemberExpr(const MemberExpr *M, ExplodedNode *Pred,
344                           ExplodedNodeSet &Dst);
345
346  /// Transfer function logic for ObjCAtSynchronizedStmts.
347  void VisitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt *S,
348                                   ExplodedNode *Pred, ExplodedNodeSet &Dst);
349
350  /// Transfer function logic for computing the lvalue of an Objective-C ivar.
351  void VisitLvalObjCIvarRefExpr(const ObjCIvarRefExpr *DR, ExplodedNode *Pred,
352                                ExplodedNodeSet &Dst);
353
354  /// VisitObjCForCollectionStmt - Transfer function logic for
355  ///  ObjCForCollectionStmt.
356  void VisitObjCForCollectionStmt(const ObjCForCollectionStmt *S,
357                                  ExplodedNode *Pred, ExplodedNodeSet &Dst);
358
359  void VisitObjCMessage(const ObjCMessageExpr *ME, ExplodedNode *Pred,
360                        ExplodedNodeSet &Dst);
361
362  /// VisitReturnStmt - Transfer function logic for return statements.
363  void VisitReturnStmt(const ReturnStmt *R, ExplodedNode *Pred,
364                       ExplodedNodeSet &Dst);
365
366  /// VisitOffsetOfExpr - Transfer function for offsetof.
367  void VisitOffsetOfExpr(const OffsetOfExpr *Ex, ExplodedNode *Pred,
368                         ExplodedNodeSet &Dst);
369
370  /// VisitUnaryExprOrTypeTraitExpr - Transfer function for sizeof.
371  void VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex,
372                              ExplodedNode *Pred, ExplodedNodeSet &Dst);
373
374  /// VisitUnaryOperator - Transfer function logic for unary operators.
375  void VisitUnaryOperator(const UnaryOperator* B, ExplodedNode *Pred,
376                          ExplodedNodeSet &Dst);
377
378  /// Handle ++ and -- (both pre- and post-increment).
379  void VisitIncrementDecrementOperator(const UnaryOperator* U,
380                                       ExplodedNode *Pred,
381                                       ExplodedNodeSet &Dst);
382
383  void VisitCXXCatchStmt(const CXXCatchStmt *CS, ExplodedNode *Pred,
384                         ExplodedNodeSet &Dst);
385
386  void VisitCXXThisExpr(const CXXThisExpr *TE, ExplodedNode *Pred,
387                        ExplodedNodeSet & Dst);
388
389  void VisitCXXConstructExpr(const CXXConstructExpr *E, ExplodedNode *Pred,
390                             ExplodedNodeSet &Dst);
391
392  void VisitCXXDestructor(QualType ObjectType, const MemRegion *Dest,
393                          const Stmt *S, bool IsBaseDtor,
394                          ExplodedNode *Pred, ExplodedNodeSet &Dst);
395
396  void VisitCXXNewExpr(const CXXNewExpr *CNE, ExplodedNode *Pred,
397                       ExplodedNodeSet &Dst);
398
399  void VisitCXXDeleteExpr(const CXXDeleteExpr *CDE, ExplodedNode *Pred,
400                          ExplodedNodeSet &Dst);
401
402  /// Create a C++ temporary object for an rvalue.
403  void CreateCXXTemporaryObject(const MaterializeTemporaryExpr *ME,
404                                ExplodedNode *Pred,
405                                ExplodedNodeSet &Dst);
406
407  /// evalEagerlyAssumeBinOpBifurcation - Given the nodes in 'Src', eagerly assume symbolic
408  ///  expressions of the form 'x != 0' and generate new nodes (stored in Dst)
409  ///  with those assumptions.
410  void evalEagerlyAssumeBinOpBifurcation(ExplodedNodeSet &Dst, ExplodedNodeSet &Src,
411                         const Expr *Ex);
412
413  std::pair<const ProgramPointTag *, const ProgramPointTag*>
414    geteagerlyAssumeBinOpBifurcationTags();
415
416  SVal evalMinus(SVal X) {
417    return X.isValid() ? svalBuilder.evalMinus(cast<NonLoc>(X)) : X;
418  }
419
420  SVal evalComplement(SVal X) {
421    return X.isValid() ? svalBuilder.evalComplement(cast<NonLoc>(X)) : X;
422  }
423
424public:
425
426  SVal evalBinOp(ProgramStateRef state, BinaryOperator::Opcode op,
427                 NonLoc L, NonLoc R, QualType T) {
428    return svalBuilder.evalBinOpNN(state, op, L, R, T);
429  }
430
431  SVal evalBinOp(ProgramStateRef state, BinaryOperator::Opcode op,
432                 NonLoc L, SVal R, QualType T) {
433    return R.isValid() ? svalBuilder.evalBinOpNN(state,op,L, cast<NonLoc>(R), T) : R;
434  }
435
436  SVal evalBinOp(ProgramStateRef ST, BinaryOperator::Opcode Op,
437                 SVal LHS, SVal RHS, QualType T) {
438    return svalBuilder.evalBinOp(ST, Op, LHS, RHS, T);
439  }
440
441protected:
442  /// evalBind - Handle the semantics of binding a value to a specific location.
443  ///  This method is used by evalStore, VisitDeclStmt, and others.
444  void evalBind(ExplodedNodeSet &Dst, const Stmt *StoreE, ExplodedNode *Pred,
445                SVal location, SVal Val, bool atDeclInit = false,
446                const ProgramPoint *PP = 0);
447
448public:
449  // FIXME: 'tag' should be removed, and a LocationContext should be used
450  // instead.
451  // FIXME: Comment on the meaning of the arguments, when 'St' may not
452  // be the same as Pred->state, and when 'location' may not be the
453  // same as state->getLValue(Ex).
454  /// Simulate a read of the result of Ex.
455  void evalLoad(ExplodedNodeSet &Dst,
456                const Expr *NodeEx,  /* Eventually will be a CFGStmt */
457                const Expr *BoundExpr,
458                ExplodedNode *Pred,
459                ProgramStateRef St,
460                SVal location,
461                const ProgramPointTag *tag = 0,
462                QualType LoadTy = QualType());
463
464  // FIXME: 'tag' should be removed, and a LocationContext should be used
465  // instead.
466  void evalStore(ExplodedNodeSet &Dst, const Expr *AssignE, const Expr *StoreE,
467                 ExplodedNode *Pred, ProgramStateRef St, SVal TargetLV, SVal Val,
468                 const ProgramPointTag *tag = 0);
469
470  /// \brief Create a new state in which the call return value is binded to the
471  /// call origin expression.
472  ProgramStateRef bindReturnValue(const CallEvent &Call,
473                                  const LocationContext *LCtx,
474                                  ProgramStateRef State);
475
476  /// Evaluate a call, running pre- and post-call checks and allowing checkers
477  /// to be responsible for handling the evaluation of the call itself.
478  void evalCall(ExplodedNodeSet &Dst, ExplodedNode *Pred,
479                const CallEvent &Call);
480
481  /// \brief Default implementation of call evaluation.
482  void defaultEvalCall(NodeBuilder &B, ExplodedNode *Pred,
483                       const CallEvent &Call);
484private:
485  void evalLoadCommon(ExplodedNodeSet &Dst,
486                      const Expr *NodeEx,  /* Eventually will be a CFGStmt */
487                      const Expr *BoundEx,
488                      ExplodedNode *Pred,
489                      ProgramStateRef St,
490                      SVal location,
491                      const ProgramPointTag *tag,
492                      QualType LoadTy);
493
494  // FIXME: 'tag' should be removed, and a LocationContext should be used
495  // instead.
496  void evalLocation(ExplodedNodeSet &Dst,
497                    const Stmt *NodeEx, /* This will eventually be a CFGStmt */
498                    const Stmt *BoundEx,
499                    ExplodedNode *Pred,
500                    ProgramStateRef St, SVal location,
501                    const ProgramPointTag *tag, bool isLoad);
502
503  /// Count the stack depth and determine if the call is recursive.
504  void examineStackFrames(const Decl *D, const LocationContext *LCtx,
505                          bool &IsRecursive, unsigned &StackDepth);
506
507  bool shouldInlineDecl(const Decl *D, ExplodedNode *Pred);
508  bool inlineCall(const CallEvent &Call, const Decl *D, NodeBuilder &Bldr,
509                  ExplodedNode *Pred, ProgramStateRef State);
510
511  /// \brief Conservatively evaluate call by invalidating regions and binding
512  /// a conjured return value.
513  void conservativeEvalCall(const CallEvent &Call, NodeBuilder &Bldr,
514                            ExplodedNode *Pred, ProgramStateRef State);
515
516  /// \brief Either inline or process the call conservatively (or both), based
517  /// on DynamicDispatchBifurcation data.
518  void BifurcateCall(const MemRegion *BifurReg,
519                     const CallEvent &Call, const Decl *D, NodeBuilder &Bldr,
520                     ExplodedNode *Pred);
521
522  bool replayWithoutInlining(ExplodedNode *P, const LocationContext *CalleeLC);
523};
524
525/// Traits for storing the call processing policy inside GDM.
526/// The GDM stores the corresponding CallExpr pointer.
527// FIXME: This does not use the nice trait macros because it must be accessible
528// from multiple translation units.
529struct ReplayWithoutInlining{};
530template <>
531struct ProgramStateTrait<ReplayWithoutInlining> :
532  public ProgramStatePartialTrait<void*> {
533  static void *GDMIndex() { static int index = 0; return &index; }
534};
535
536} // end ento namespace
537
538} // end clang namespace
539
540#endif
541