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_STATICANALYZER_CORE_PATHSENSITIVE_EXPRENGINE_H 17 #define LLVM_CLANG_STATICANALYZER_CORE_PATHSENSITIVE_EXPRENGINE_H 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 29 namespace clang { 30 31 class AnalysisDeclContextManager; 32 class CXXCatchStmt; 33 class CXXConstructExpr; 34 class CXXDeleteExpr; 35 class CXXNewExpr; 36 class CXXTemporaryObjectExpr; 37 class CXXThisExpr; 38 class MaterializeTemporaryExpr; 39 class ObjCAtSynchronizedStmt; 40 class ObjCForCollectionStmt; 41 42 namespace ento { 43 44 class AnalysisManager; 45 class CallEvent; 46 class CXXConstructorCall; 47 48 class ExprEngine : public SubEngine { 49 public: 50 /// The modes of inlining, which override the default analysis-wide settings. 51 enum InliningModes { 52 /// Follow the default settings for inlining callees. 53 Inline_Regular = 0, 54 /// Do minimal inlining of callees. 55 Inline_Minimal = 0x1 56 }; 57 58 private: 59 AnalysisManager &AMgr; 60 61 AnalysisDeclContextManager &AnalysisDeclContexts; 62 63 CoreEngine Engine; 64 65 /// G - the simulation graph. 66 ExplodedGraph& G; 67 68 /// StateMgr - Object that manages the data for all created states. 69 ProgramStateManager StateMgr; 70 71 /// SymMgr - Object that manages the symbol information. 72 SymbolManager& SymMgr; 73 74 /// svalBuilder - SValBuilder object that creates SVals from expressions. 75 SValBuilder &svalBuilder; 76 77 unsigned int currStmtIdx; 78 const NodeBuilderContext *currBldrCtx; 79 80 /// Helper object to determine if an Objective-C message expression 81 /// implicitly never returns. 82 ObjCNoReturn ObjCNoRet; 83 84 /// Whether or not GC is enabled in this analysis. 85 bool ObjCGCEnabled; 86 87 /// The BugReporter associated with this engine. It is important that 88 /// this object be placed at the very end of member variables so that its 89 /// destructor is called before the rest of the ExprEngine is destroyed. 90 GRBugReporter BR; 91 92 /// The functions which have been analyzed through inlining. This is owned by 93 /// AnalysisConsumer. It can be null. 94 SetOfConstDecls *VisitedCallees; 95 96 /// The flag, which specifies the mode of inlining for the engine. 97 InliningModes HowToInline; 98 99 public: 100 ExprEngine(AnalysisManager &mgr, bool gcEnabled, 101 SetOfConstDecls *VisitedCalleesIn, 102 FunctionSummariesTy *FS, 103 InliningModes HowToInlineIn); 104 105 ~ExprEngine() override; 106 107 /// Returns true if there is still simulation state on the worklist. 108 bool ExecuteWorkList(const LocationContext *L, unsigned Steps = 150000) { 109 return Engine.ExecuteWorkList(L, Steps, nullptr); 110 } 111 112 /// Execute the work list with an initial state. Nodes that reaches the exit 113 /// of the function are added into the Dst set, which represent the exit 114 /// state of the function call. Returns true if there is still simulation 115 /// state on the worklist. 116 bool ExecuteWorkListWithInitialState(const LocationContext *L, unsigned Steps, 117 ProgramStateRef InitState, 118 ExplodedNodeSet &Dst) { 119 return Engine.ExecuteWorkListWithInitialState(L, Steps, InitState, Dst); 120 } 121 122 /// getContext - Return the ASTContext associated with this analysis. 123 ASTContext &getContext() const { return AMgr.getASTContext(); } 124 125 AnalysisManager &getAnalysisManager() override { return AMgr; } 126 127 CheckerManager &getCheckerManager() const { 128 return *AMgr.getCheckerManager(); 129 } 130 131 SValBuilder &getSValBuilder() { return svalBuilder; } 132 133 BugReporter& getBugReporter() { return BR; } 134 135 const NodeBuilderContext &getBuilderContext() { 136 assert(currBldrCtx); 137 return *currBldrCtx; 138 } 139 140 bool isObjCGCEnabled() { return ObjCGCEnabled; } 141 142 const Stmt *getStmt() const; 143 144 void GenerateAutoTransition(ExplodedNode *N); 145 void enqueueEndOfPath(ExplodedNodeSet &S); 146 void GenerateCallExitNode(ExplodedNode *N); 147 148 /// Visualize the ExplodedGraph created by executing the simulation. 149 void ViewGraph(bool trim = false); 150 151 /// Visualize a trimmed ExplodedGraph that only contains paths to the given 152 /// nodes. 153 void ViewGraph(ArrayRef<const ExplodedNode*> Nodes); 154 155 /// getInitialState - Return the initial state used for the root vertex 156 /// in the ExplodedGraph. 157 ProgramStateRef getInitialState(const LocationContext *InitLoc) override; 158 159 ExplodedGraph& getGraph() { return G; } 160 const ExplodedGraph& getGraph() const { return G; } 161 162 /// \brief Run the analyzer's garbage collection - remove dead symbols and 163 /// bindings from the state. 164 /// 165 /// Checkers can participate in this process with two callbacks: 166 /// \c checkLiveSymbols and \c checkDeadSymbols. See the CheckerDocumentation 167 /// class for more information. 168 /// 169 /// \param Node The predecessor node, from which the processing should start. 170 /// \param Out The returned set of output nodes. 171 /// \param ReferenceStmt The statement which is about to be processed. 172 /// Everything needed for this statement should be considered live. 173 /// A null statement means that everything in child LocationContexts 174 /// is dead. 175 /// \param LC The location context of the \p ReferenceStmt. A null location 176 /// context means that we have reached the end of analysis and that 177 /// all statements and local variables should be considered dead. 178 /// \param DiagnosticStmt Used as a location for any warnings that should 179 /// occur while removing the dead (e.g. leaks). By default, the 180 /// \p ReferenceStmt is used. 181 /// \param K Denotes whether this is a pre- or post-statement purge. This 182 /// must only be ProgramPoint::PostStmtPurgeDeadSymbolsKind if an 183 /// entire location context is being cleared, in which case the 184 /// \p ReferenceStmt must either be a ReturnStmt or \c NULL. Otherwise, 185 /// it must be ProgramPoint::PreStmtPurgeDeadSymbolsKind (the default) 186 /// and \p ReferenceStmt must be valid (non-null). 187 void removeDead(ExplodedNode *Node, ExplodedNodeSet &Out, 188 const Stmt *ReferenceStmt, const LocationContext *LC, 189 const Stmt *DiagnosticStmt = nullptr, 190 ProgramPoint::Kind K = ProgramPoint::PreStmtPurgeDeadSymbolsKind); 191 192 /// processCFGElement - Called by CoreEngine. Used to generate new successor 193 /// nodes by processing the 'effects' of a CFG element. 194 void processCFGElement(const CFGElement E, ExplodedNode *Pred, 195 unsigned StmtIdx, NodeBuilderContext *Ctx) override; 196 197 void ProcessStmt(const CFGStmt S, ExplodedNode *Pred); 198 199 void ProcessInitializer(const CFGInitializer I, ExplodedNode *Pred); 200 201 void ProcessImplicitDtor(const CFGImplicitDtor D, ExplodedNode *Pred); 202 203 void ProcessNewAllocator(const CXXNewExpr *NE, ExplodedNode *Pred); 204 205 void ProcessAutomaticObjDtor(const CFGAutomaticObjDtor D, 206 ExplodedNode *Pred, ExplodedNodeSet &Dst); 207 void ProcessDeleteDtor(const CFGDeleteDtor D, 208 ExplodedNode *Pred, ExplodedNodeSet &Dst); 209 void ProcessBaseDtor(const CFGBaseDtor D, 210 ExplodedNode *Pred, ExplodedNodeSet &Dst); 211 void ProcessMemberDtor(const CFGMemberDtor D, 212 ExplodedNode *Pred, ExplodedNodeSet &Dst); 213 void ProcessTemporaryDtor(const CFGTemporaryDtor D, 214 ExplodedNode *Pred, ExplodedNodeSet &Dst); 215 216 /// Called by CoreEngine when processing the entrance of a CFGBlock. 217 void processCFGBlockEntrance(const BlockEdge &L, 218 NodeBuilderWithSinks &nodeBuilder, 219 ExplodedNode *Pred) override; 220 221 /// ProcessBranch - Called by CoreEngine. Used to generate successor 222 /// nodes by processing the 'effects' of a branch condition. 223 void processBranch(const Stmt *Condition, const Stmt *Term, 224 NodeBuilderContext& BuilderCtx, 225 ExplodedNode *Pred, 226 ExplodedNodeSet &Dst, 227 const CFGBlock *DstT, 228 const CFGBlock *DstF) override; 229 230 /// Called by CoreEngine. 231 /// Used to generate successor nodes for temporary destructors depending 232 /// on whether the corresponding constructor was visited. 233 void processCleanupTemporaryBranch(const CXXBindTemporaryExpr *BTE, 234 NodeBuilderContext &BldCtx, 235 ExplodedNode *Pred, ExplodedNodeSet &Dst, 236 const CFGBlock *DstT, 237 const CFGBlock *DstF) override; 238 239 /// Called by CoreEngine. Used to processing branching behavior 240 /// at static initalizers. 241 void processStaticInitializer(const DeclStmt *DS, 242 NodeBuilderContext& BuilderCtx, 243 ExplodedNode *Pred, 244 ExplodedNodeSet &Dst, 245 const CFGBlock *DstT, 246 const CFGBlock *DstF) override; 247 248 /// processIndirectGoto - Called by CoreEngine. Used to generate successor 249 /// nodes by processing the 'effects' of a computed goto jump. 250 void processIndirectGoto(IndirectGotoNodeBuilder& builder) override; 251 252 /// ProcessSwitch - Called by CoreEngine. Used to generate successor 253 /// nodes by processing the 'effects' of a switch statement. 254 void processSwitch(SwitchNodeBuilder& builder) override; 255 256 /// Called by CoreEngine. Used to notify checkers that processing a 257 /// function has begun. Called for both inlined and and top-level functions. 258 void processBeginOfFunction(NodeBuilderContext &BC, 259 ExplodedNode *Pred, ExplodedNodeSet &Dst, 260 const BlockEdge &L) override; 261 262 /// Called by CoreEngine. Used to notify checkers that processing a 263 /// function has ended. Called for both inlined and and top-level functions. 264 void processEndOfFunction(NodeBuilderContext& BC, 265 ExplodedNode *Pred) override; 266 267 /// Remove dead bindings/symbols before exiting a function. 268 void removeDeadOnEndOfFunction(NodeBuilderContext& BC, 269 ExplodedNode *Pred, 270 ExplodedNodeSet &Dst); 271 272 /// Generate the entry node of the callee. 273 void processCallEnter(NodeBuilderContext& BC, CallEnter CE, 274 ExplodedNode *Pred) override; 275 276 /// Generate the sequence of nodes that simulate the call exit and the post 277 /// visit for CallExpr. 278 void processCallExit(ExplodedNode *Pred) override; 279 280 /// Called by CoreEngine when the analysis worklist has terminated. 281 void processEndWorklist(bool hasWorkRemaining) override; 282 283 /// evalAssume - Callback function invoked by the ConstraintManager when 284 /// making assumptions about state values. 285 ProgramStateRef processAssume(ProgramStateRef state, SVal cond, 286 bool assumption) override; 287 288 /// wantsRegionChangeUpdate - Called by ProgramStateManager to determine if a 289 /// region change should trigger a processRegionChanges update. 290 bool wantsRegionChangeUpdate(ProgramStateRef state) override; 291 292 /// processRegionChanges - Called by ProgramStateManager whenever a change is made 293 /// to the store. Used to update checkers that track region values. 294 ProgramStateRef 295 processRegionChanges(ProgramStateRef state, 296 const InvalidatedSymbols *invalidated, 297 ArrayRef<const MemRegion *> ExplicitRegions, 298 ArrayRef<const MemRegion *> Regions, 299 const CallEvent *Call) override; 300 301 /// printState - Called by ProgramStateManager to print checker-specific data. 302 void printState(raw_ostream &Out, ProgramStateRef State, 303 const char *NL, const char *Sep) override; 304 305 ProgramStateManager& getStateManager() override { return StateMgr; } 306 307 StoreManager& getStoreManager() { return StateMgr.getStoreManager(); } 308 309 ConstraintManager& getConstraintManager() { 310 return StateMgr.getConstraintManager(); 311 } 312 313 // FIXME: Remove when we migrate over to just using SValBuilder. 314 BasicValueFactory& getBasicVals() { 315 return StateMgr.getBasicVals(); 316 } 317 318 // FIXME: Remove when we migrate over to just using ValueManager. 319 SymbolManager& getSymbolManager() { return SymMgr; } 320 const SymbolManager& getSymbolManager() const { return SymMgr; } 321 322 // Functions for external checking of whether we have unfinished work 323 bool wasBlocksExhausted() const { return Engine.wasBlocksExhausted(); } 324 bool hasEmptyWorkList() const { return !Engine.getWorkList()->hasWork(); } 325 bool hasWorkRemaining() const { return Engine.hasWorkRemaining(); } 326 327 const CoreEngine &getCoreEngine() const { return Engine; } 328 329 public: 330 /// Visit - Transfer function logic for all statements. Dispatches to 331 /// other functions that handle specific kinds of statements. 332 void Visit(const Stmt *S, ExplodedNode *Pred, ExplodedNodeSet &Dst); 333 334 /// VisitArraySubscriptExpr - Transfer function for array accesses. 335 void VisitLvalArraySubscriptExpr(const ArraySubscriptExpr *Ex, 336 ExplodedNode *Pred, 337 ExplodedNodeSet &Dst); 338 339 /// VisitGCCAsmStmt - Transfer function logic for inline asm. 340 void VisitGCCAsmStmt(const GCCAsmStmt *A, ExplodedNode *Pred, 341 ExplodedNodeSet &Dst); 342 343 /// VisitMSAsmStmt - Transfer function logic for MS inline asm. 344 void VisitMSAsmStmt(const MSAsmStmt *A, ExplodedNode *Pred, 345 ExplodedNodeSet &Dst); 346 347 /// VisitBlockExpr - Transfer function logic for BlockExprs. 348 void VisitBlockExpr(const BlockExpr *BE, ExplodedNode *Pred, 349 ExplodedNodeSet &Dst); 350 351 /// VisitLambdaExpr - Transfer function logic for LambdaExprs. 352 void VisitLambdaExpr(const LambdaExpr *LE, ExplodedNode *Pred, 353 ExplodedNodeSet &Dst); 354 355 /// VisitBinaryOperator - Transfer function logic for binary operators. 356 void VisitBinaryOperator(const BinaryOperator* B, ExplodedNode *Pred, 357 ExplodedNodeSet &Dst); 358 359 360 /// VisitCall - Transfer function for function calls. 361 void VisitCallExpr(const CallExpr *CE, ExplodedNode *Pred, 362 ExplodedNodeSet &Dst); 363 364 /// VisitCast - Transfer function logic for all casts (implicit and explicit). 365 void VisitCast(const CastExpr *CastE, const Expr *Ex, ExplodedNode *Pred, 366 ExplodedNodeSet &Dst); 367 368 /// VisitCompoundLiteralExpr - Transfer function logic for compound literals. 369 void VisitCompoundLiteralExpr(const CompoundLiteralExpr *CL, 370 ExplodedNode *Pred, ExplodedNodeSet &Dst); 371 372 /// Transfer function logic for DeclRefExprs and BlockDeclRefExprs. 373 void VisitCommonDeclRefExpr(const Expr *DR, const NamedDecl *D, 374 ExplodedNode *Pred, ExplodedNodeSet &Dst); 375 376 /// VisitDeclStmt - Transfer function logic for DeclStmts. 377 void VisitDeclStmt(const DeclStmt *DS, ExplodedNode *Pred, 378 ExplodedNodeSet &Dst); 379 380 /// VisitGuardedExpr - Transfer function logic for ?, __builtin_choose 381 void VisitGuardedExpr(const Expr *Ex, const Expr *L, const Expr *R, 382 ExplodedNode *Pred, ExplodedNodeSet &Dst); 383 384 void VisitInitListExpr(const InitListExpr *E, ExplodedNode *Pred, 385 ExplodedNodeSet &Dst); 386 387 /// VisitLogicalExpr - Transfer function logic for '&&', '||' 388 void VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred, 389 ExplodedNodeSet &Dst); 390 391 /// VisitMemberExpr - Transfer function for member expressions. 392 void VisitMemberExpr(const MemberExpr *M, ExplodedNode *Pred, 393 ExplodedNodeSet &Dst); 394 395 /// VisitMemberExpr - Transfer function for builtin atomic expressions 396 void VisitAtomicExpr(const AtomicExpr *E, ExplodedNode *Pred, 397 ExplodedNodeSet &Dst); 398 399 /// Transfer function logic for ObjCAtSynchronizedStmts. 400 void VisitObjCAtSynchronizedStmt(const ObjCAtSynchronizedStmt *S, 401 ExplodedNode *Pred, ExplodedNodeSet &Dst); 402 403 /// Transfer function logic for computing the lvalue of an Objective-C ivar. 404 void VisitLvalObjCIvarRefExpr(const ObjCIvarRefExpr *DR, ExplodedNode *Pred, 405 ExplodedNodeSet &Dst); 406 407 /// VisitObjCForCollectionStmt - Transfer function logic for 408 /// ObjCForCollectionStmt. 409 void VisitObjCForCollectionStmt(const ObjCForCollectionStmt *S, 410 ExplodedNode *Pred, ExplodedNodeSet &Dst); 411 412 void VisitObjCMessage(const ObjCMessageExpr *ME, ExplodedNode *Pred, 413 ExplodedNodeSet &Dst); 414 415 /// VisitReturnStmt - Transfer function logic for return statements. 416 void VisitReturnStmt(const ReturnStmt *R, ExplodedNode *Pred, 417 ExplodedNodeSet &Dst); 418 419 /// VisitOffsetOfExpr - Transfer function for offsetof. 420 void VisitOffsetOfExpr(const OffsetOfExpr *Ex, ExplodedNode *Pred, 421 ExplodedNodeSet &Dst); 422 423 /// VisitUnaryExprOrTypeTraitExpr - Transfer function for sizeof. 424 void VisitUnaryExprOrTypeTraitExpr(const UnaryExprOrTypeTraitExpr *Ex, 425 ExplodedNode *Pred, ExplodedNodeSet &Dst); 426 427 /// VisitUnaryOperator - Transfer function logic for unary operators. 428 void VisitUnaryOperator(const UnaryOperator* B, ExplodedNode *Pred, 429 ExplodedNodeSet &Dst); 430 431 /// Handle ++ and -- (both pre- and post-increment). 432 void VisitIncrementDecrementOperator(const UnaryOperator* U, 433 ExplodedNode *Pred, 434 ExplodedNodeSet &Dst); 435 436 void VisitCXXBindTemporaryExpr(const CXXBindTemporaryExpr *BTE, 437 ExplodedNodeSet &PreVisit, 438 ExplodedNodeSet &Dst); 439 440 void VisitCXXCatchStmt(const CXXCatchStmt *CS, ExplodedNode *Pred, 441 ExplodedNodeSet &Dst); 442 443 void VisitCXXThisExpr(const CXXThisExpr *TE, ExplodedNode *Pred, 444 ExplodedNodeSet & Dst); 445 446 void VisitCXXConstructExpr(const CXXConstructExpr *E, ExplodedNode *Pred, 447 ExplodedNodeSet &Dst); 448 449 void VisitCXXDestructor(QualType ObjectType, const MemRegion *Dest, 450 const Stmt *S, bool IsBaseDtor, 451 ExplodedNode *Pred, ExplodedNodeSet &Dst); 452 453 void VisitCXXNewAllocatorCall(const CXXNewExpr *CNE, 454 ExplodedNode *Pred, 455 ExplodedNodeSet &Dst); 456 457 void VisitCXXNewExpr(const CXXNewExpr *CNE, ExplodedNode *Pred, 458 ExplodedNodeSet &Dst); 459 460 void VisitCXXDeleteExpr(const CXXDeleteExpr *CDE, ExplodedNode *Pred, 461 ExplodedNodeSet &Dst); 462 463 /// Create a C++ temporary object for an rvalue. 464 void CreateCXXTemporaryObject(const MaterializeTemporaryExpr *ME, 465 ExplodedNode *Pred, 466 ExplodedNodeSet &Dst); 467 468 /// evalEagerlyAssumeBinOpBifurcation - Given the nodes in 'Src', eagerly assume symbolic 469 /// expressions of the form 'x != 0' and generate new nodes (stored in Dst) 470 /// with those assumptions. 471 void evalEagerlyAssumeBinOpBifurcation(ExplodedNodeSet &Dst, ExplodedNodeSet &Src, 472 const Expr *Ex); 473 474 std::pair<const ProgramPointTag *, const ProgramPointTag*> 475 geteagerlyAssumeBinOpBifurcationTags(); 476 477 SVal evalMinus(SVal X) { 478 return X.isValid() ? svalBuilder.evalMinus(X.castAs<NonLoc>()) : X; 479 } 480 481 SVal evalComplement(SVal X) { 482 return X.isValid() ? svalBuilder.evalComplement(X.castAs<NonLoc>()) : X; 483 } 484 485 public: 486 487 SVal evalBinOp(ProgramStateRef state, BinaryOperator::Opcode op, 488 NonLoc L, NonLoc R, QualType T) { 489 return svalBuilder.evalBinOpNN(state, op, L, R, T); 490 } 491 492 SVal evalBinOp(ProgramStateRef state, BinaryOperator::Opcode op, 493 NonLoc L, SVal R, QualType T) { 494 return R.isValid() ? svalBuilder.evalBinOpNN(state, op, L, 495 R.castAs<NonLoc>(), T) : R; 496 } 497 498 SVal evalBinOp(ProgramStateRef ST, BinaryOperator::Opcode Op, 499 SVal LHS, SVal RHS, QualType T) { 500 return svalBuilder.evalBinOp(ST, Op, LHS, RHS, T); 501 } 502 503 protected: 504 /// evalBind - Handle the semantics of binding a value to a specific location. 505 /// This method is used by evalStore, VisitDeclStmt, and others. 506 void evalBind(ExplodedNodeSet &Dst, const Stmt *StoreE, ExplodedNode *Pred, 507 SVal location, SVal Val, bool atDeclInit = false, 508 const ProgramPoint *PP = nullptr); 509 510 /// Call PointerEscape callback when a value escapes as a result of bind. 511 ProgramStateRef processPointerEscapedOnBind(ProgramStateRef State, 512 SVal Loc, SVal Val) override; 513 /// Call PointerEscape callback when a value escapes as a result of 514 /// region invalidation. 515 /// \param[in] ITraits Specifies invalidation traits for regions/symbols. 516 ProgramStateRef notifyCheckersOfPointerEscape( 517 ProgramStateRef State, 518 const InvalidatedSymbols *Invalidated, 519 ArrayRef<const MemRegion *> ExplicitRegions, 520 ArrayRef<const MemRegion *> Regions, 521 const CallEvent *Call, 522 RegionAndSymbolInvalidationTraits &ITraits) override; 523 524 public: 525 // FIXME: 'tag' should be removed, and a LocationContext should be used 526 // instead. 527 // FIXME: Comment on the meaning of the arguments, when 'St' may not 528 // be the same as Pred->state, and when 'location' may not be the 529 // same as state->getLValue(Ex). 530 /// Simulate a read of the result of Ex. 531 void evalLoad(ExplodedNodeSet &Dst, 532 const Expr *NodeEx, /* Eventually will be a CFGStmt */ 533 const Expr *BoundExpr, 534 ExplodedNode *Pred, 535 ProgramStateRef St, 536 SVal location, 537 const ProgramPointTag *tag = nullptr, 538 QualType LoadTy = QualType()); 539 540 // FIXME: 'tag' should be removed, and a LocationContext should be used 541 // instead. 542 void evalStore(ExplodedNodeSet &Dst, const Expr *AssignE, const Expr *StoreE, 543 ExplodedNode *Pred, ProgramStateRef St, SVal TargetLV, SVal Val, 544 const ProgramPointTag *tag = nullptr); 545 546 /// \brief Create a new state in which the call return value is binded to the 547 /// call origin expression. 548 ProgramStateRef bindReturnValue(const CallEvent &Call, 549 const LocationContext *LCtx, 550 ProgramStateRef State); 551 552 /// Evaluate a call, running pre- and post-call checks and allowing checkers 553 /// to be responsible for handling the evaluation of the call itself. 554 void evalCall(ExplodedNodeSet &Dst, ExplodedNode *Pred, 555 const CallEvent &Call); 556 557 /// \brief Default implementation of call evaluation. 558 void defaultEvalCall(NodeBuilder &B, ExplodedNode *Pred, 559 const CallEvent &Call); 560 private: 561 void evalLoadCommon(ExplodedNodeSet &Dst, 562 const Expr *NodeEx, /* Eventually will be a CFGStmt */ 563 const Expr *BoundEx, 564 ExplodedNode *Pred, 565 ProgramStateRef St, 566 SVal location, 567 const ProgramPointTag *tag, 568 QualType LoadTy); 569 570 // FIXME: 'tag' should be removed, and a LocationContext should be used 571 // instead. 572 void evalLocation(ExplodedNodeSet &Dst, 573 const Stmt *NodeEx, /* This will eventually be a CFGStmt */ 574 const Stmt *BoundEx, 575 ExplodedNode *Pred, 576 ProgramStateRef St, SVal location, 577 const ProgramPointTag *tag, bool isLoad); 578 579 /// Count the stack depth and determine if the call is recursive. 580 void examineStackFrames(const Decl *D, const LocationContext *LCtx, 581 bool &IsRecursive, unsigned &StackDepth); 582 583 /// Checks our policies and decides weither the given call should be inlined. 584 bool shouldInlineCall(const CallEvent &Call, const Decl *D, 585 const ExplodedNode *Pred); 586 587 bool inlineCall(const CallEvent &Call, const Decl *D, NodeBuilder &Bldr, 588 ExplodedNode *Pred, ProgramStateRef State); 589 590 /// \brief Conservatively evaluate call by invalidating regions and binding 591 /// a conjured return value. 592 void conservativeEvalCall(const CallEvent &Call, NodeBuilder &Bldr, 593 ExplodedNode *Pred, ProgramStateRef State); 594 595 /// \brief Either inline or process the call conservatively (or both), based 596 /// on DynamicDispatchBifurcation data. 597 void BifurcateCall(const MemRegion *BifurReg, 598 const CallEvent &Call, const Decl *D, NodeBuilder &Bldr, 599 ExplodedNode *Pred); 600 601 bool replayWithoutInlining(ExplodedNode *P, const LocationContext *CalleeLC); 602 603 /// Models a trivial copy or move constructor or trivial assignment operator 604 /// call with a simple bind. 605 void performTrivialCopy(NodeBuilder &Bldr, ExplodedNode *Pred, 606 const CallEvent &Call); 607 608 /// If the value of the given expression is a NonLoc, copy it into a new 609 /// temporary object region, and replace the value of the expression with 610 /// that. 611 /// 612 /// If \p ResultE is provided, the new region will be bound to this expression 613 /// instead of \p E. 614 ProgramStateRef createTemporaryRegionIfNeeded(ProgramStateRef State, 615 const LocationContext *LC, 616 const Expr *E, 617 const Expr *ResultE = nullptr); 618 619 /// For a DeclStmt or CXXInitCtorInitializer, walk backward in the current CFG 620 /// block to find the constructor expression that directly constructed into 621 /// the storage for this statement. Returns null if the constructor for this 622 /// statement created a temporary object region rather than directly 623 /// constructing into an existing region. 624 const CXXConstructExpr *findDirectConstructorForCurrentCFGElement(); 625 626 /// For a CXXConstructExpr, walk forward in the current CFG block to find the 627 /// CFGElement for the DeclStmt or CXXInitCtorInitializer for which is 628 /// directly constructed by this constructor. Returns None if the current 629 /// constructor expression did not directly construct into an existing 630 /// region. 631 Optional<CFGElement> findElementDirectlyInitializedByCurrentConstructor(); 632 633 /// For a given constructor, look forward in the current CFG block to 634 /// determine the region into which an object will be constructed by \p CE. 635 /// Returns either a field or local variable region if the object will be 636 /// directly constructed in an existing region or a temporary object region 637 /// if not. 638 const MemRegion *getRegionForConstructedObject(const CXXConstructExpr *CE, 639 ExplodedNode *Pred); 640 }; 641 642 /// Traits for storing the call processing policy inside GDM. 643 /// The GDM stores the corresponding CallExpr pointer. 644 // FIXME: This does not use the nice trait macros because it must be accessible 645 // from multiple translation units. 646 struct ReplayWithoutInlining{}; 647 template <> 648 struct ProgramStateTrait<ReplayWithoutInlining> : 649 public ProgramStatePartialTrait<const void*> { 650 static void *GDMIndex() { static int index = 0; return &index; } 651 }; 652 653 } // end ento namespace 654 655 } // end clang namespace 656 657 #endif 658
