1 //===- AnalysisDeclContext.cpp - Analysis context for Path Sens analysis --===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file defines AnalysisDeclContext, a class that manages the analysis
10 // context data for path sensitive analysis.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/Analysis/AnalysisDeclContext.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/Decl.h"
17 #include "clang/AST/DeclBase.h"
18 #include "clang/AST/DeclCXX.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/Expr.h"
22 #include "clang/AST/LambdaCapture.h"
23 #include "clang/AST/ParentMap.h"
24 #include "clang/AST/PrettyPrinter.h"
25 #include "clang/AST/Stmt.h"
26 #include "clang/AST/StmtCXX.h"
27 #include "clang/AST/StmtVisitor.h"
28 #include "clang/Analysis/Analyses/CFGReachabilityAnalysis.h"
29 #include "clang/Analysis/BodyFarm.h"
30 #include "clang/Analysis/CFG.h"
31 #include "clang/Analysis/CFGStmtMap.h"
32 #include "clang/Analysis/Support/BumpVector.h"
33 #include "clang/Basic/LLVM.h"
34 #include "clang/Basic/SourceLocation.h"
35 #include "clang/Basic/SourceManager.h"
36 #include "llvm/ADT/DenseMap.h"
37 #include "llvm/ADT/FoldingSet.h"
38 #include "llvm/ADT/STLExtras.h"
39 #include "llvm/ADT/SmallPtrSet.h"
40 #include "llvm/ADT/iterator_range.h"
41 #include "llvm/Support/Allocator.h"
42 #include "llvm/Support/Casting.h"
43 #include "llvm/Support/Compiler.h"
44 #include "llvm/Support/ErrorHandling.h"
45 #include "llvm/Support/SaveAndRestore.h"
46 #include "llvm/Support/raw_ostream.h"
47 #include <cassert>
48 #include <memory>
49 
50 using namespace clang;
51 
52 using ManagedAnalysisMap = llvm::DenseMap<const void *, ManagedAnalysis *>;
53 
54 AnalysisDeclContext::AnalysisDeclContext(AnalysisDeclContextManager *Mgr,
55                                          const Decl *d,
56                                          const CFG::BuildOptions &buildOptions)
57     : Manager(Mgr), D(d), cfgBuildOptions(buildOptions) {
58   cfgBuildOptions.forcedBlkExprs = &forcedBlkExprs;
59 }
60 
61 AnalysisDeclContext::AnalysisDeclContext(AnalysisDeclContextManager *Mgr,
62                                          const Decl *d)
63     : Manager(Mgr), D(d) {
64   cfgBuildOptions.forcedBlkExprs = &forcedBlkExprs;
65 }
66 
67 AnalysisDeclContextManager::AnalysisDeclContextManager(
68     ASTContext &ASTCtx, bool useUnoptimizedCFG, bool addImplicitDtors,
69     bool addInitializers, bool addTemporaryDtors, bool addLifetime,
70     bool addLoopExit, bool addScopes, bool synthesizeBodies,
71     bool addStaticInitBranch, bool addCXXNewAllocator,
72     bool addRichCXXConstructors, bool markElidedCXXConstructors,
73     CodeInjector *injector)
74     : Injector(injector), FunctionBodyFarm(ASTCtx, injector),
75       SynthesizeBodies(synthesizeBodies) {
76   cfgBuildOptions.PruneTriviallyFalseEdges = !useUnoptimizedCFG;
77   cfgBuildOptions.AddImplicitDtors = addImplicitDtors;
78   cfgBuildOptions.AddInitializers = addInitializers;
79   cfgBuildOptions.AddTemporaryDtors = addTemporaryDtors;
80   cfgBuildOptions.AddLifetime = addLifetime;
81   cfgBuildOptions.AddLoopExit = addLoopExit;
82   cfgBuildOptions.AddScopes = addScopes;
83   cfgBuildOptions.AddStaticInitBranches = addStaticInitBranch;
84   cfgBuildOptions.AddCXXNewAllocator = addCXXNewAllocator;
85   cfgBuildOptions.AddRichCXXConstructors = addRichCXXConstructors;
86   cfgBuildOptions.MarkElidedCXXConstructors = markElidedCXXConstructors;
87 }
88 
89 void AnalysisDeclContextManager::clear() { Contexts.clear(); }
90 
91 Stmt *AnalysisDeclContext::getBody(bool &IsAutosynthesized) const {
92   IsAutosynthesized = false;
93   if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
94     Stmt *Body = FD->getBody();
95     if (auto *CoroBody = dyn_cast_or_null<CoroutineBodyStmt>(Body))
96       Body = CoroBody->getBody();
97     if (Manager && Manager->synthesizeBodies()) {
98       Stmt *SynthesizedBody = Manager->getBodyFarm().getBody(FD);
99       if (SynthesizedBody) {
100         Body = SynthesizedBody;
101         IsAutosynthesized = true;
102       }
103     }
104     return Body;
105   }
106   else if (const auto *MD = dyn_cast<ObjCMethodDecl>(D)) {
107     Stmt *Body = MD->getBody();
108     if (Manager && Manager->synthesizeBodies()) {
109       Stmt *SynthesizedBody = Manager->getBodyFarm().getBody(MD);
110       if (SynthesizedBody) {
111         Body = SynthesizedBody;
112         IsAutosynthesized = true;
113       }
114     }
115     return Body;
116   } else if (const auto *BD = dyn_cast<BlockDecl>(D))
117     return BD->getBody();
118   else if (const auto *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(D))
119     return FunTmpl->getTemplatedDecl()->getBody();
120 
121   llvm_unreachable("unknown code decl");
122 }
123 
124 Stmt *AnalysisDeclContext::getBody() const {
125   bool Tmp;
126   return getBody(Tmp);
127 }
128 
129 bool AnalysisDeclContext::isBodyAutosynthesized() const {
130   bool Tmp;
131   getBody(Tmp);
132   return Tmp;
133 }
134 
135 bool AnalysisDeclContext::isBodyAutosynthesizedFromModelFile() const {
136   bool Tmp;
137   Stmt *Body = getBody(Tmp);
138   return Tmp && Body->getBeginLoc().isValid();
139 }
140 
141 /// Returns true if \param VD is an Objective-C implicit 'self' parameter.
142 static bool isSelfDecl(const VarDecl *VD) {
143   return isa<ImplicitParamDecl>(VD) && VD->getName() == "self";
144 }
145 
146 const ImplicitParamDecl *AnalysisDeclContext::getSelfDecl() const {
147   if (const auto *MD = dyn_cast<ObjCMethodDecl>(D))
148     return MD->getSelfDecl();
149   if (const auto *BD = dyn_cast<BlockDecl>(D)) {
150     // See if 'self' was captured by the block.
151     for (const auto &I : BD->captures()) {
152       const VarDecl *VD = I.getVariable();
153       if (isSelfDecl(VD))
154         return dyn_cast<ImplicitParamDecl>(VD);
155     }
156   }
157 
158   auto *CXXMethod = dyn_cast<CXXMethodDecl>(D);
159   if (!CXXMethod)
160     return nullptr;
161 
162   const CXXRecordDecl *parent = CXXMethod->getParent();
163   if (!parent->isLambda())
164     return nullptr;
165 
166   for (const auto &LC : parent->captures()) {
167     if (!LC.capturesVariable())
168       continue;
169 
170     VarDecl *VD = LC.getCapturedVar();
171     if (isSelfDecl(VD))
172       return dyn_cast<ImplicitParamDecl>(VD);
173   }
174 
175   return nullptr;
176 }
177 
178 void AnalysisDeclContext::registerForcedBlockExpression(const Stmt *stmt) {
179   if (!forcedBlkExprs)
180     forcedBlkExprs = new CFG::BuildOptions::ForcedBlkExprs();
181   // Default construct an entry for 'stmt'.
182   if (const auto *e = dyn_cast<Expr>(stmt))
183     stmt = e->IgnoreParens();
184   (void) (*forcedBlkExprs)[stmt];
185 }
186 
187 const CFGBlock *
188 AnalysisDeclContext::getBlockForRegisteredExpression(const Stmt *stmt) {
189   assert(forcedBlkExprs);
190   if (const auto *e = dyn_cast<Expr>(stmt))
191     stmt = e->IgnoreParens();
192   CFG::BuildOptions::ForcedBlkExprs::const_iterator itr =
193     forcedBlkExprs->find(stmt);
194   assert(itr != forcedBlkExprs->end());
195   return itr->second;
196 }
197 
198 /// Add each synthetic statement in the CFG to the parent map, using the
199 /// source statement's parent.
200 static void addParentsForSyntheticStmts(const CFG *TheCFG, ParentMap &PM) {
201   if (!TheCFG)
202     return;
203 
204   for (CFG::synthetic_stmt_iterator I = TheCFG->synthetic_stmt_begin(),
205                                     E = TheCFG->synthetic_stmt_end();
206        I != E; ++I) {
207     PM.setParent(I->first, PM.getParent(I->second));
208   }
209 }
210 
211 CFG *AnalysisDeclContext::getCFG() {
212   if (!cfgBuildOptions.PruneTriviallyFalseEdges)
213     return getUnoptimizedCFG();
214 
215   if (!builtCFG) {
216     cfg = CFG::buildCFG(D, getBody(), &D->getASTContext(), cfgBuildOptions);
217     // Even when the cfg is not successfully built, we don't
218     // want to try building it again.
219     builtCFG = true;
220 
221     if (PM)
222       addParentsForSyntheticStmts(cfg.get(), *PM);
223 
224     // The Observer should only observe one build of the CFG.
225     getCFGBuildOptions().Observer = nullptr;
226   }
227   return cfg.get();
228 }
229 
230 CFG *AnalysisDeclContext::getUnoptimizedCFG() {
231   if (!builtCompleteCFG) {
232     SaveAndRestore<bool> NotPrune(cfgBuildOptions.PruneTriviallyFalseEdges,
233                                   false);
234     completeCFG =
235         CFG::buildCFG(D, getBody(), &D->getASTContext(), cfgBuildOptions);
236     // Even when the cfg is not successfully built, we don't
237     // want to try building it again.
238     builtCompleteCFG = true;
239 
240     if (PM)
241       addParentsForSyntheticStmts(completeCFG.get(), *PM);
242 
243     // The Observer should only observe one build of the CFG.
244     getCFGBuildOptions().Observer = nullptr;
245   }
246   return completeCFG.get();
247 }
248 
249 CFGStmtMap *AnalysisDeclContext::getCFGStmtMap() {
250   if (cfgStmtMap)
251     return cfgStmtMap.get();
252 
253   if (CFG *c = getCFG()) {
254     cfgStmtMap.reset(CFGStmtMap::Build(c, &getParentMap()));
255     return cfgStmtMap.get();
256   }
257 
258   return nullptr;
259 }
260 
261 CFGReverseBlockReachabilityAnalysis *AnalysisDeclContext::getCFGReachablityAnalysis() {
262   if (CFA)
263     return CFA.get();
264 
265   if (CFG *c = getCFG()) {
266     CFA.reset(new CFGReverseBlockReachabilityAnalysis(*c));
267     return CFA.get();
268   }
269 
270   return nullptr;
271 }
272 
273 void AnalysisDeclContext::dumpCFG(bool ShowColors) {
274   getCFG()->dump(getASTContext().getLangOpts(), ShowColors);
275 }
276 
277 ParentMap &AnalysisDeclContext::getParentMap() {
278   if (!PM) {
279     PM.reset(new ParentMap(getBody()));
280     if (const auto *C = dyn_cast<CXXConstructorDecl>(getDecl())) {
281       for (const auto *I : C->inits()) {
282         PM->addStmt(I->getInit());
283       }
284     }
285     if (builtCFG)
286       addParentsForSyntheticStmts(getCFG(), *PM);
287     if (builtCompleteCFG)
288       addParentsForSyntheticStmts(getUnoptimizedCFG(), *PM);
289   }
290   return *PM;
291 }
292 
293 AnalysisDeclContext *AnalysisDeclContextManager::getContext(const Decl *D) {
294   if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
295     // Calling 'hasBody' replaces 'FD' in place with the FunctionDecl
296     // that has the body.
297     FD->hasBody(FD);
298     D = FD;
299   }
300 
301   std::unique_ptr<AnalysisDeclContext> &AC = Contexts[D];
302   if (!AC)
303     AC = llvm::make_unique<AnalysisDeclContext>(this, D, cfgBuildOptions);
304   return AC.get();
305 }
306 
307 BodyFarm &AnalysisDeclContextManager::getBodyFarm() { return FunctionBodyFarm; }
308 
309 const StackFrameContext *
310 AnalysisDeclContext::getStackFrame(LocationContext const *Parent, const Stmt *S,
311                                const CFGBlock *Blk, unsigned Idx) {
312   return getLocationContextManager().getStackFrame(this, Parent, S, Blk, Idx);
313 }
314 
315 const BlockInvocationContext *
316 AnalysisDeclContext::getBlockInvocationContext(const LocationContext *parent,
317                                                const BlockDecl *BD,
318                                                const void *ContextData) {
319   return getLocationContextManager().getBlockInvocationContext(this, parent,
320                                                                BD, ContextData);
321 }
322 
323 bool AnalysisDeclContext::isInStdNamespace(const Decl *D) {
324   const DeclContext *DC = D->getDeclContext()->getEnclosingNamespaceContext();
325   const auto *ND = dyn_cast<NamespaceDecl>(DC);
326   if (!ND)
327     return false;
328 
329   while (const DeclContext *Parent = ND->getParent()) {
330     if (!isa<NamespaceDecl>(Parent))
331       break;
332     ND = cast<NamespaceDecl>(Parent);
333   }
334 
335   return ND->isStdNamespace();
336 }
337 
338 LocationContextManager &AnalysisDeclContext::getLocationContextManager() {
339   assert(Manager &&
340          "Cannot create LocationContexts without an AnalysisDeclContextManager!");
341   return Manager->getLocationContextManager();
342 }
343 
344 //===----------------------------------------------------------------------===//
345 // FoldingSet profiling.
346 //===----------------------------------------------------------------------===//
347 
348 void LocationContext::ProfileCommon(llvm::FoldingSetNodeID &ID,
349                                     ContextKind ck,
350                                     AnalysisDeclContext *ctx,
351                                     const LocationContext *parent,
352                                     const void *data) {
353   ID.AddInteger(ck);
354   ID.AddPointer(ctx);
355   ID.AddPointer(parent);
356   ID.AddPointer(data);
357 }
358 
359 void StackFrameContext::Profile(llvm::FoldingSetNodeID &ID) {
360   Profile(ID, getAnalysisDeclContext(), getParent(), CallSite, Block, Index);
361 }
362 
363 void ScopeContext::Profile(llvm::FoldingSetNodeID &ID) {
364   Profile(ID, getAnalysisDeclContext(), getParent(), Enter);
365 }
366 
367 void BlockInvocationContext::Profile(llvm::FoldingSetNodeID &ID) {
368   Profile(ID, getAnalysisDeclContext(), getParent(), BD, ContextData);
369 }
370 
371 //===----------------------------------------------------------------------===//
372 // LocationContext creation.
373 //===----------------------------------------------------------------------===//
374 
375 template <typename LOC, typename DATA>
376 const LOC*
377 LocationContextManager::getLocationContext(AnalysisDeclContext *ctx,
378                                            const LocationContext *parent,
379                                            const DATA *d) {
380   llvm::FoldingSetNodeID ID;
381   LOC::Profile(ID, ctx, parent, d);
382   void *InsertPos;
383 
384   LOC *L = cast_or_null<LOC>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
385 
386   if (!L) {
387     L = new LOC(ctx, parent, d, ++NewID);
388     Contexts.InsertNode(L, InsertPos);
389   }
390   return L;
391 }
392 
393 const StackFrameContext*
394 LocationContextManager::getStackFrame(AnalysisDeclContext *ctx,
395                                       const LocationContext *parent,
396                                       const Stmt *s,
397                                       const CFGBlock *blk, unsigned idx) {
398   llvm::FoldingSetNodeID ID;
399   StackFrameContext::Profile(ID, ctx, parent, s, blk, idx);
400   void *InsertPos;
401   auto *L =
402    cast_or_null<StackFrameContext>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
403   if (!L) {
404     L = new StackFrameContext(ctx, parent, s, blk, idx, ++NewID);
405     Contexts.InsertNode(L, InsertPos);
406   }
407   return L;
408 }
409 
410 const ScopeContext *
411 LocationContextManager::getScope(AnalysisDeclContext *ctx,
412                                  const LocationContext *parent,
413                                  const Stmt *s) {
414   return getLocationContext<ScopeContext, Stmt>(ctx, parent, s);
415 }
416 
417 const BlockInvocationContext *
418 LocationContextManager::getBlockInvocationContext(AnalysisDeclContext *ctx,
419                                                   const LocationContext *parent,
420                                                   const BlockDecl *BD,
421                                                   const void *ContextData) {
422   llvm::FoldingSetNodeID ID;
423   BlockInvocationContext::Profile(ID, ctx, parent, BD, ContextData);
424   void *InsertPos;
425   auto *L =
426     cast_or_null<BlockInvocationContext>(Contexts.FindNodeOrInsertPos(ID,
427                                                                     InsertPos));
428   if (!L) {
429     L = new BlockInvocationContext(ctx, parent, BD, ContextData, ++NewID);
430     Contexts.InsertNode(L, InsertPos);
431   }
432   return L;
433 }
434 
435 //===----------------------------------------------------------------------===//
436 // LocationContext methods.
437 //===----------------------------------------------------------------------===//
438 
439 const StackFrameContext *LocationContext::getStackFrame() const {
440   const LocationContext *LC = this;
441   while (LC) {
442     if (const auto *SFC = dyn_cast<StackFrameContext>(LC))
443       return SFC;
444     LC = LC->getParent();
445   }
446   return nullptr;
447 }
448 
449 bool LocationContext::inTopFrame() const {
450   return getStackFrame()->inTopFrame();
451 }
452 
453 bool LocationContext::isParentOf(const LocationContext *LC) const {
454   do {
455     const LocationContext *Parent = LC->getParent();
456     if (Parent == this)
457       return true;
458     else
459       LC = Parent;
460   } while (LC);
461 
462   return false;
463 }
464 
465 static void printLocation(raw_ostream &OS, const SourceManager &SM,
466                           SourceLocation SLoc) {
467   if (SLoc.isFileID() && SM.isInMainFile(SLoc))
468     OS << "line " << SM.getExpansionLineNumber(SLoc);
469   else
470     SLoc.print(OS, SM);
471 }
472 
473 void LocationContext::dumpStack(
474     raw_ostream &OS, StringRef Indent, const char *NL, const char *Sep,
475     std::function<void(const LocationContext *)> printMoreInfoPerContext) const {
476   ASTContext &Ctx = getAnalysisDeclContext()->getASTContext();
477   PrintingPolicy PP(Ctx.getLangOpts());
478   PP.TerseOutput = 1;
479 
480   const SourceManager &SM =
481       getAnalysisDeclContext()->getASTContext().getSourceManager();
482 
483   unsigned Frame = 0;
484   for (const LocationContext *LCtx = this; LCtx; LCtx = LCtx->getParent()) {
485     switch (LCtx->getKind()) {
486     case StackFrame:
487       OS << Indent << '#' << Frame << ' ';
488       ++Frame;
489       if (const auto *D = dyn_cast<NamedDecl>(LCtx->getDecl()))
490         OS << "Calling " << D->getQualifiedNameAsString();
491       else
492         OS << "Calling anonymous code";
493       if (const Stmt *S = cast<StackFrameContext>(LCtx)->getCallSite()) {
494         OS << " at ";
495         printLocation(OS, SM, S->getBeginLoc());
496       }
497       break;
498     case Scope:
499       OS << "Entering scope";
500       break;
501     case Block:
502       OS << "Invoking block";
503       if (const Decl *D = cast<BlockInvocationContext>(LCtx)->getDecl()) {
504         OS << " defined at ";
505         printLocation(OS, SM, D->getBeginLoc());
506       }
507       break;
508     }
509     OS << NL;
510 
511     printMoreInfoPerContext(LCtx);
512   }
513 }
514 
515 LLVM_DUMP_METHOD void LocationContext::dumpStack() const {
516   dumpStack(llvm::errs());
517 }
518 
519 //===----------------------------------------------------------------------===//
520 // Lazily generated map to query the external variables referenced by a Block.
521 //===----------------------------------------------------------------------===//
522 
523 namespace {
524 
525 class FindBlockDeclRefExprsVals : public StmtVisitor<FindBlockDeclRefExprsVals>{
526   BumpVector<const VarDecl *> &BEVals;
527   BumpVectorContext &BC;
528   llvm::SmallPtrSet<const VarDecl *, 4> Visited;
529   llvm::SmallPtrSet<const DeclContext *, 4> IgnoredContexts;
530 
531 public:
532   FindBlockDeclRefExprsVals(BumpVector<const VarDecl*> &bevals,
533                             BumpVectorContext &bc)
534       : BEVals(bevals), BC(bc) {}
535 
536   void VisitStmt(Stmt *S) {
537     for (auto *Child : S->children())
538       if (Child)
539         Visit(Child);
540   }
541 
542   void VisitDeclRefExpr(DeclRefExpr *DR) {
543     // Non-local variables are also directly modified.
544     if (const auto *VD = dyn_cast<VarDecl>(DR->getDecl())) {
545       if (!VD->hasLocalStorage()) {
546         if (Visited.insert(VD).second)
547           BEVals.push_back(VD, BC);
548       }
549     }
550   }
551 
552   void VisitBlockExpr(BlockExpr *BR) {
553     // Blocks containing blocks can transitively capture more variables.
554     IgnoredContexts.insert(BR->getBlockDecl());
555     Visit(BR->getBlockDecl()->getBody());
556   }
557 
558   void VisitPseudoObjectExpr(PseudoObjectExpr *PE) {
559     for (PseudoObjectExpr::semantics_iterator it = PE->semantics_begin(),
560          et = PE->semantics_end(); it != et; ++it) {
561       Expr *Semantic = *it;
562       if (auto *OVE = dyn_cast<OpaqueValueExpr>(Semantic))
563         Semantic = OVE->getSourceExpr();
564       Visit(Semantic);
565     }
566   }
567 };
568 
569 } // namespace
570 
571 using DeclVec = BumpVector<const VarDecl *>;
572 
573 static DeclVec* LazyInitializeReferencedDecls(const BlockDecl *BD,
574                                               void *&Vec,
575                                               llvm::BumpPtrAllocator &A) {
576   if (Vec)
577     return (DeclVec*) Vec;
578 
579   BumpVectorContext BC(A);
580   DeclVec *BV = (DeclVec*) A.Allocate<DeclVec>();
581   new (BV) DeclVec(BC, 10);
582 
583   // Go through the capture list.
584   for (const auto &CI : BD->captures()) {
585     BV->push_back(CI.getVariable(), BC);
586   }
587 
588   // Find the referenced global/static variables.
589   FindBlockDeclRefExprsVals F(*BV, BC);
590   F.Visit(BD->getBody());
591 
592   Vec = BV;
593   return BV;
594 }
595 
596 llvm::iterator_range<AnalysisDeclContext::referenced_decls_iterator>
597 AnalysisDeclContext::getReferencedBlockVars(const BlockDecl *BD) {
598   if (!ReferencedBlockVars)
599     ReferencedBlockVars = new llvm::DenseMap<const BlockDecl*,void*>();
600 
601   const DeclVec *V =
602       LazyInitializeReferencedDecls(BD, (*ReferencedBlockVars)[BD], A);
603   return llvm::make_range(V->begin(), V->end());
604 }
605 
606 ManagedAnalysis *&AnalysisDeclContext::getAnalysisImpl(const void *tag) {
607   if (!ManagedAnalyses)
608     ManagedAnalyses = new ManagedAnalysisMap();
609   ManagedAnalysisMap *M = (ManagedAnalysisMap*) ManagedAnalyses;
610   return (*M)[tag];
611 }
612 
613 //===----------------------------------------------------------------------===//
614 // Cleanup.
615 //===----------------------------------------------------------------------===//
616 
617 ManagedAnalysis::~ManagedAnalysis() = default;
618 
619 AnalysisDeclContext::~AnalysisDeclContext() {
620   delete forcedBlkExprs;
621   delete ReferencedBlockVars;
622   // Release the managed analyses.
623   if (ManagedAnalyses) {
624     ManagedAnalysisMap *M = (ManagedAnalysisMap*) ManagedAnalyses;
625     llvm::DeleteContainerSeconds(*M);
626     delete M;
627   }
628 }
629 
630 LocationContext::~LocationContext() = default;
631 
632 LocationContextManager::~LocationContextManager() {
633   clear();
634 }
635 
636 void LocationContextManager::clear() {
637   for (llvm::FoldingSet<LocationContext>::iterator I = Contexts.begin(),
638        E = Contexts.end(); I != E; ) {
639     LocationContext *LC = &*I;
640     ++I;
641     delete LC;
642   }
643   Contexts.clear();
644 }
645