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1 //== AnalysisDeclContext.cpp - Analysis context for Path Sens analysis -*- 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 AnalysisDeclContext, a class that manages the analysis context
11 // data for path sensitive analysis.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "clang/Analysis/AnalysisContext.h"
16 #include "BodyFarm.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/Decl.h"
19 #include "clang/AST/DeclObjC.h"
20 #include "clang/AST/DeclTemplate.h"
21 #include "clang/AST/ParentMap.h"
22 #include "clang/AST/StmtVisitor.h"
23 #include "clang/Analysis/Analyses/CFGReachabilityAnalysis.h"
24 #include "clang/Analysis/Analyses/LiveVariables.h"
25 #include "clang/Analysis/Analyses/PseudoConstantAnalysis.h"
26 #include "clang/Analysis/CFG.h"
27 #include "clang/Analysis/CFGStmtMap.h"
28 #include "clang/Analysis/Support/BumpVector.h"
29 #include "llvm/ADT/SmallPtrSet.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/SaveAndRestore.h"
32 #include "llvm/Support/raw_ostream.h"
33 
34 using namespace clang;
35 
36 typedef llvm::DenseMap<const void *, ManagedAnalysis *> ManagedAnalysisMap;
37 
AnalysisDeclContext(AnalysisDeclContextManager * Mgr,const Decl * d,const CFG::BuildOptions & buildOptions)38 AnalysisDeclContext::AnalysisDeclContext(AnalysisDeclContextManager *Mgr,
39                                          const Decl *d,
40                                          const CFG::BuildOptions &buildOptions)
41   : Manager(Mgr),
42     D(d),
43     cfgBuildOptions(buildOptions),
44     forcedBlkExprs(nullptr),
45     builtCFG(false),
46     builtCompleteCFG(false),
47     ReferencedBlockVars(nullptr),
48     ManagedAnalyses(nullptr)
49 {
50   cfgBuildOptions.forcedBlkExprs = &forcedBlkExprs;
51 }
52 
AnalysisDeclContext(AnalysisDeclContextManager * Mgr,const Decl * d)53 AnalysisDeclContext::AnalysisDeclContext(AnalysisDeclContextManager *Mgr,
54                                          const Decl *d)
55 : Manager(Mgr),
56   D(d),
57   forcedBlkExprs(nullptr),
58   builtCFG(false),
59   builtCompleteCFG(false),
60   ReferencedBlockVars(nullptr),
61   ManagedAnalyses(nullptr)
62 {
63   cfgBuildOptions.forcedBlkExprs = &forcedBlkExprs;
64 }
65 
AnalysisDeclContextManager(bool useUnoptimizedCFG,bool addImplicitDtors,bool addInitializers,bool addTemporaryDtors,bool synthesizeBodies,bool addStaticInitBranch,bool addCXXNewAllocator,CodeInjector * injector)66 AnalysisDeclContextManager::AnalysisDeclContextManager(bool useUnoptimizedCFG,
67                                                        bool addImplicitDtors,
68                                                        bool addInitializers,
69                                                        bool addTemporaryDtors,
70                                                        bool synthesizeBodies,
71                                                        bool addStaticInitBranch,
72                                                        bool addCXXNewAllocator,
73                                                        CodeInjector *injector)
74   : Injector(injector), SynthesizeBodies(synthesizeBodies)
75 {
76   cfgBuildOptions.PruneTriviallyFalseEdges = !useUnoptimizedCFG;
77   cfgBuildOptions.AddImplicitDtors = addImplicitDtors;
78   cfgBuildOptions.AddInitializers = addInitializers;
79   cfgBuildOptions.AddTemporaryDtors = addTemporaryDtors;
80   cfgBuildOptions.AddStaticInitBranches = addStaticInitBranch;
81   cfgBuildOptions.AddCXXNewAllocator = addCXXNewAllocator;
82 }
83 
clear()84 void AnalysisDeclContextManager::clear() {
85   llvm::DeleteContainerSeconds(Contexts);
86 }
87 
getBodyFarm(ASTContext & C,CodeInjector * injector=nullptr)88 static BodyFarm &getBodyFarm(ASTContext &C, CodeInjector *injector = nullptr) {
89   static BodyFarm *BF = new BodyFarm(C, injector);
90   return *BF;
91 }
92 
getBody(bool & IsAutosynthesized) const93 Stmt *AnalysisDeclContext::getBody(bool &IsAutosynthesized) const {
94   IsAutosynthesized = false;
95   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
96     Stmt *Body = FD->getBody();
97     if (Manager && Manager->synthesizeBodies()) {
98       Stmt *SynthesizedBody =
99           getBodyFarm(getASTContext(), Manager->Injector.get()).getBody(FD);
100       if (SynthesizedBody) {
101         Body = SynthesizedBody;
102         IsAutosynthesized = true;
103       }
104     }
105     return Body;
106   }
107   else if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D)) {
108     Stmt *Body = MD->getBody();
109     if (Manager && Manager->synthesizeBodies()) {
110       Stmt *SynthesizedBody =
111           getBodyFarm(getASTContext(), Manager->Injector.get()).getBody(MD);
112       if (SynthesizedBody) {
113         Body = SynthesizedBody;
114         IsAutosynthesized = true;
115       }
116     }
117     return Body;
118   } else if (const BlockDecl *BD = dyn_cast<BlockDecl>(D))
119     return BD->getBody();
120   else if (const FunctionTemplateDecl *FunTmpl
121            = dyn_cast_or_null<FunctionTemplateDecl>(D))
122     return FunTmpl->getTemplatedDecl()->getBody();
123 
124   llvm_unreachable("unknown code decl");
125 }
126 
getBody() const127 Stmt *AnalysisDeclContext::getBody() const {
128   bool Tmp;
129   return getBody(Tmp);
130 }
131 
isBodyAutosynthesized() const132 bool AnalysisDeclContext::isBodyAutosynthesized() const {
133   bool Tmp;
134   getBody(Tmp);
135   return Tmp;
136 }
137 
isBodyAutosynthesizedFromModelFile() const138 bool AnalysisDeclContext::isBodyAutosynthesizedFromModelFile() const {
139   bool Tmp;
140   Stmt *Body = getBody(Tmp);
141   return Tmp && Body->getLocStart().isValid();
142 }
143 
144 /// Returns true if \param VD is an Objective-C implicit 'self' parameter.
isSelfDecl(const VarDecl * VD)145 static bool isSelfDecl(const VarDecl *VD) {
146   return isa<ImplicitParamDecl>(VD) && VD->getName() == "self";
147 }
148 
getSelfDecl() const149 const ImplicitParamDecl *AnalysisDeclContext::getSelfDecl() const {
150   if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(D))
151     return MD->getSelfDecl();
152   if (const BlockDecl *BD = dyn_cast<BlockDecl>(D)) {
153     // See if 'self' was captured by the block.
154     for (const auto &I : BD->captures()) {
155       const VarDecl *VD = I.getVariable();
156       if (isSelfDecl(VD))
157         return dyn_cast<ImplicitParamDecl>(VD);
158     }
159   }
160 
161   auto *CXXMethod = dyn_cast<CXXMethodDecl>(D);
162   if (!CXXMethod)
163     return nullptr;
164 
165   const CXXRecordDecl *parent = CXXMethod->getParent();
166   if (!parent->isLambda())
167     return nullptr;
168 
169   for (const LambdaCapture &LC : parent->captures()) {
170     if (!LC.capturesVariable())
171       continue;
172 
173     VarDecl *VD = LC.getCapturedVar();
174     if (isSelfDecl(VD))
175       return dyn_cast<ImplicitParamDecl>(VD);
176   }
177 
178   return nullptr;
179 }
180 
registerForcedBlockExpression(const Stmt * stmt)181 void AnalysisDeclContext::registerForcedBlockExpression(const Stmt *stmt) {
182   if (!forcedBlkExprs)
183     forcedBlkExprs = new CFG::BuildOptions::ForcedBlkExprs();
184   // Default construct an entry for 'stmt'.
185   if (const Expr *e = dyn_cast<Expr>(stmt))
186     stmt = e->IgnoreParens();
187   (void) (*forcedBlkExprs)[stmt];
188 }
189 
190 const CFGBlock *
getBlockForRegisteredExpression(const Stmt * stmt)191 AnalysisDeclContext::getBlockForRegisteredExpression(const Stmt *stmt) {
192   assert(forcedBlkExprs);
193   if (const Expr *e = dyn_cast<Expr>(stmt))
194     stmt = e->IgnoreParens();
195   CFG::BuildOptions::ForcedBlkExprs::const_iterator itr =
196     forcedBlkExprs->find(stmt);
197   assert(itr != forcedBlkExprs->end());
198   return itr->second;
199 }
200 
201 /// Add each synthetic statement in the CFG to the parent map, using the
202 /// source statement's parent.
addParentsForSyntheticStmts(const CFG * TheCFG,ParentMap & PM)203 static void addParentsForSyntheticStmts(const CFG *TheCFG, ParentMap &PM) {
204   if (!TheCFG)
205     return;
206 
207   for (CFG::synthetic_stmt_iterator I = TheCFG->synthetic_stmt_begin(),
208                                     E = TheCFG->synthetic_stmt_end();
209        I != E; ++I) {
210     PM.setParent(I->first, PM.getParent(I->second));
211   }
212 }
213 
getCFG()214 CFG *AnalysisDeclContext::getCFG() {
215   if (!cfgBuildOptions.PruneTriviallyFalseEdges)
216     return getUnoptimizedCFG();
217 
218   if (!builtCFG) {
219     cfg = CFG::buildCFG(D, getBody(), &D->getASTContext(), cfgBuildOptions);
220     // Even when the cfg is not successfully built, we don't
221     // want to try building it again.
222     builtCFG = true;
223 
224     if (PM)
225       addParentsForSyntheticStmts(cfg.get(), *PM);
226 
227     // The Observer should only observe one build of the CFG.
228     getCFGBuildOptions().Observer = nullptr;
229   }
230   return cfg.get();
231 }
232 
getUnoptimizedCFG()233 CFG *AnalysisDeclContext::getUnoptimizedCFG() {
234   if (!builtCompleteCFG) {
235     SaveAndRestore<bool> NotPrune(cfgBuildOptions.PruneTriviallyFalseEdges,
236                                   false);
237     completeCFG =
238         CFG::buildCFG(D, getBody(), &D->getASTContext(), cfgBuildOptions);
239     // Even when the cfg is not successfully built, we don't
240     // want to try building it again.
241     builtCompleteCFG = true;
242 
243     if (PM)
244       addParentsForSyntheticStmts(completeCFG.get(), *PM);
245 
246     // The Observer should only observe one build of the CFG.
247     getCFGBuildOptions().Observer = nullptr;
248   }
249   return completeCFG.get();
250 }
251 
getCFGStmtMap()252 CFGStmtMap *AnalysisDeclContext::getCFGStmtMap() {
253   if (cfgStmtMap)
254     return cfgStmtMap.get();
255 
256   if (CFG *c = getCFG()) {
257     cfgStmtMap.reset(CFGStmtMap::Build(c, &getParentMap()));
258     return cfgStmtMap.get();
259   }
260 
261   return nullptr;
262 }
263 
getCFGReachablityAnalysis()264 CFGReverseBlockReachabilityAnalysis *AnalysisDeclContext::getCFGReachablityAnalysis() {
265   if (CFA)
266     return CFA.get();
267 
268   if (CFG *c = getCFG()) {
269     CFA.reset(new CFGReverseBlockReachabilityAnalysis(*c));
270     return CFA.get();
271   }
272 
273   return nullptr;
274 }
275 
dumpCFG(bool ShowColors)276 void AnalysisDeclContext::dumpCFG(bool ShowColors) {
277     getCFG()->dump(getASTContext().getLangOpts(), ShowColors);
278 }
279 
getParentMap()280 ParentMap &AnalysisDeclContext::getParentMap() {
281   if (!PM) {
282     PM.reset(new ParentMap(getBody()));
283     if (const CXXConstructorDecl *C = dyn_cast<CXXConstructorDecl>(getDecl())) {
284       for (const auto *I : C->inits()) {
285         PM->addStmt(I->getInit());
286       }
287     }
288     if (builtCFG)
289       addParentsForSyntheticStmts(getCFG(), *PM);
290     if (builtCompleteCFG)
291       addParentsForSyntheticStmts(getUnoptimizedCFG(), *PM);
292   }
293   return *PM;
294 }
295 
getPseudoConstantAnalysis()296 PseudoConstantAnalysis *AnalysisDeclContext::getPseudoConstantAnalysis() {
297   if (!PCA)
298     PCA.reset(new PseudoConstantAnalysis(getBody()));
299   return PCA.get();
300 }
301 
getContext(const Decl * D)302 AnalysisDeclContext *AnalysisDeclContextManager::getContext(const Decl *D) {
303   if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
304     // Calling 'hasBody' replaces 'FD' in place with the FunctionDecl
305     // that has the body.
306     FD->hasBody(FD);
307     D = FD;
308   }
309 
310   AnalysisDeclContext *&AC = Contexts[D];
311   if (!AC)
312     AC = new AnalysisDeclContext(this, D, cfgBuildOptions);
313   return AC;
314 }
315 
316 const StackFrameContext *
getStackFrame(LocationContext const * Parent,const Stmt * S,const CFGBlock * Blk,unsigned Idx)317 AnalysisDeclContext::getStackFrame(LocationContext const *Parent, const Stmt *S,
318                                const CFGBlock *Blk, unsigned Idx) {
319   return getLocationContextManager().getStackFrame(this, Parent, S, Blk, Idx);
320 }
321 
322 const BlockInvocationContext *
getBlockInvocationContext(const LocationContext * parent,const clang::BlockDecl * BD,const void * ContextData)323 AnalysisDeclContext::getBlockInvocationContext(const LocationContext *parent,
324                                                const clang::BlockDecl *BD,
325                                                const void *ContextData) {
326   return getLocationContextManager().getBlockInvocationContext(this, parent,
327                                                                BD, ContextData);
328 }
329 
isInStdNamespace(const Decl * D)330 bool AnalysisDeclContext::isInStdNamespace(const Decl *D) {
331   const DeclContext *DC = D->getDeclContext()->getEnclosingNamespaceContext();
332   const NamespaceDecl *ND = dyn_cast<NamespaceDecl>(DC);
333   if (!ND)
334     return false;
335 
336   while (const DeclContext *Parent = ND->getParent()) {
337     if (!isa<NamespaceDecl>(Parent))
338       break;
339     ND = cast<NamespaceDecl>(Parent);
340   }
341 
342   return ND->isStdNamespace();
343 }
344 
getLocationContextManager()345 LocationContextManager & AnalysisDeclContext::getLocationContextManager() {
346   assert(Manager &&
347          "Cannot create LocationContexts without an AnalysisDeclContextManager!");
348   return Manager->getLocationContextManager();
349 }
350 
351 //===----------------------------------------------------------------------===//
352 // FoldingSet profiling.
353 //===----------------------------------------------------------------------===//
354 
ProfileCommon(llvm::FoldingSetNodeID & ID,ContextKind ck,AnalysisDeclContext * ctx,const LocationContext * parent,const void * data)355 void LocationContext::ProfileCommon(llvm::FoldingSetNodeID &ID,
356                                     ContextKind ck,
357                                     AnalysisDeclContext *ctx,
358                                     const LocationContext *parent,
359                                     const void *data) {
360   ID.AddInteger(ck);
361   ID.AddPointer(ctx);
362   ID.AddPointer(parent);
363   ID.AddPointer(data);
364 }
365 
Profile(llvm::FoldingSetNodeID & ID)366 void StackFrameContext::Profile(llvm::FoldingSetNodeID &ID) {
367   Profile(ID, getAnalysisDeclContext(), getParent(), CallSite, Block, Index);
368 }
369 
Profile(llvm::FoldingSetNodeID & ID)370 void ScopeContext::Profile(llvm::FoldingSetNodeID &ID) {
371   Profile(ID, getAnalysisDeclContext(), getParent(), Enter);
372 }
373 
Profile(llvm::FoldingSetNodeID & ID)374 void BlockInvocationContext::Profile(llvm::FoldingSetNodeID &ID) {
375   Profile(ID, getAnalysisDeclContext(), getParent(), BD, ContextData);
376 }
377 
378 //===----------------------------------------------------------------------===//
379 // LocationContext creation.
380 //===----------------------------------------------------------------------===//
381 
382 template <typename LOC, typename DATA>
383 const LOC*
getLocationContext(AnalysisDeclContext * ctx,const LocationContext * parent,const DATA * d)384 LocationContextManager::getLocationContext(AnalysisDeclContext *ctx,
385                                            const LocationContext *parent,
386                                            const DATA *d) {
387   llvm::FoldingSetNodeID ID;
388   LOC::Profile(ID, ctx, parent, d);
389   void *InsertPos;
390 
391   LOC *L = cast_or_null<LOC>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
392 
393   if (!L) {
394     L = new LOC(ctx, parent, d);
395     Contexts.InsertNode(L, InsertPos);
396   }
397   return L;
398 }
399 
400 const StackFrameContext*
getStackFrame(AnalysisDeclContext * ctx,const LocationContext * parent,const Stmt * s,const CFGBlock * blk,unsigned idx)401 LocationContextManager::getStackFrame(AnalysisDeclContext *ctx,
402                                       const LocationContext *parent,
403                                       const Stmt *s,
404                                       const CFGBlock *blk, unsigned idx) {
405   llvm::FoldingSetNodeID ID;
406   StackFrameContext::Profile(ID, ctx, parent, s, blk, idx);
407   void *InsertPos;
408   StackFrameContext *L =
409    cast_or_null<StackFrameContext>(Contexts.FindNodeOrInsertPos(ID, InsertPos));
410   if (!L) {
411     L = new StackFrameContext(ctx, parent, s, blk, idx);
412     Contexts.InsertNode(L, InsertPos);
413   }
414   return L;
415 }
416 
417 const ScopeContext *
getScope(AnalysisDeclContext * ctx,const LocationContext * parent,const Stmt * s)418 LocationContextManager::getScope(AnalysisDeclContext *ctx,
419                                  const LocationContext *parent,
420                                  const Stmt *s) {
421   return getLocationContext<ScopeContext, Stmt>(ctx, parent, s);
422 }
423 
424 const BlockInvocationContext *
getBlockInvocationContext(AnalysisDeclContext * ctx,const LocationContext * parent,const BlockDecl * BD,const void * ContextData)425 LocationContextManager::getBlockInvocationContext(AnalysisDeclContext *ctx,
426                                                   const LocationContext *parent,
427                                                   const BlockDecl *BD,
428                                                   const void *ContextData) {
429   llvm::FoldingSetNodeID ID;
430   BlockInvocationContext::Profile(ID, ctx, parent, BD, ContextData);
431   void *InsertPos;
432   BlockInvocationContext *L =
433     cast_or_null<BlockInvocationContext>(Contexts.FindNodeOrInsertPos(ID,
434                                                                     InsertPos));
435   if (!L) {
436     L = new BlockInvocationContext(ctx, parent, BD, ContextData);
437     Contexts.InsertNode(L, InsertPos);
438   }
439   return L;
440 }
441 
442 //===----------------------------------------------------------------------===//
443 // LocationContext methods.
444 //===----------------------------------------------------------------------===//
445 
getCurrentStackFrame() const446 const StackFrameContext *LocationContext::getCurrentStackFrame() const {
447   const LocationContext *LC = this;
448   while (LC) {
449     if (const StackFrameContext *SFC = dyn_cast<StackFrameContext>(LC))
450       return SFC;
451     LC = LC->getParent();
452   }
453   return nullptr;
454 }
455 
inTopFrame() const456 bool LocationContext::inTopFrame() const {
457   return getCurrentStackFrame()->inTopFrame();
458 }
459 
isParentOf(const LocationContext * LC) const460 bool LocationContext::isParentOf(const LocationContext *LC) const {
461   do {
462     const LocationContext *Parent = LC->getParent();
463     if (Parent == this)
464       return true;
465     else
466       LC = Parent;
467   } while (LC);
468 
469   return false;
470 }
471 
dumpStack(raw_ostream & OS,StringRef Indent) const472 void LocationContext::dumpStack(raw_ostream &OS, StringRef Indent) const {
473   ASTContext &Ctx = getAnalysisDeclContext()->getASTContext();
474   PrintingPolicy PP(Ctx.getLangOpts());
475   PP.TerseOutput = 1;
476 
477   unsigned Frame = 0;
478   for (const LocationContext *LCtx = this; LCtx; LCtx = LCtx->getParent()) {
479     switch (LCtx->getKind()) {
480     case StackFrame:
481       OS << Indent << '#' << Frame++ << ' ';
482       cast<StackFrameContext>(LCtx)->getDecl()->print(OS, PP);
483       OS << '\n';
484       break;
485     case Scope:
486       OS << Indent << "    (scope)\n";
487       break;
488     case Block:
489       OS << Indent << "    (block context: "
490                    << cast<BlockInvocationContext>(LCtx)->getContextData()
491                    << ")\n";
492       break;
493     }
494   }
495 }
496 
dumpStack() const497 LLVM_DUMP_METHOD void LocationContext::dumpStack() const {
498   dumpStack(llvm::errs());
499 }
500 
501 //===----------------------------------------------------------------------===//
502 // Lazily generated map to query the external variables referenced by a Block.
503 //===----------------------------------------------------------------------===//
504 
505 namespace {
506 class FindBlockDeclRefExprsVals : public StmtVisitor<FindBlockDeclRefExprsVals>{
507   BumpVector<const VarDecl*> &BEVals;
508   BumpVectorContext &BC;
509   llvm::SmallPtrSet<const VarDecl*, 4> Visited;
510   llvm::SmallPtrSet<const DeclContext*, 4> IgnoredContexts;
511 public:
FindBlockDeclRefExprsVals(BumpVector<const VarDecl * > & bevals,BumpVectorContext & bc)512   FindBlockDeclRefExprsVals(BumpVector<const VarDecl*> &bevals,
513                             BumpVectorContext &bc)
514   : BEVals(bevals), BC(bc) {}
515 
VisitStmt(Stmt * S)516   void VisitStmt(Stmt *S) {
517     for (Stmt *Child : S->children())
518       if (Child)
519         Visit(Child);
520   }
521 
VisitDeclRefExpr(DeclRefExpr * DR)522   void VisitDeclRefExpr(DeclRefExpr *DR) {
523     // Non-local variables are also directly modified.
524     if (const VarDecl *VD = dyn_cast<VarDecl>(DR->getDecl())) {
525       if (!VD->hasLocalStorage()) {
526         if (Visited.insert(VD).second)
527           BEVals.push_back(VD, BC);
528       }
529     }
530   }
531 
VisitBlockExpr(BlockExpr * BR)532   void VisitBlockExpr(BlockExpr *BR) {
533     // Blocks containing blocks can transitively capture more variables.
534     IgnoredContexts.insert(BR->getBlockDecl());
535     Visit(BR->getBlockDecl()->getBody());
536   }
537 
VisitPseudoObjectExpr(PseudoObjectExpr * PE)538   void VisitPseudoObjectExpr(PseudoObjectExpr *PE) {
539     for (PseudoObjectExpr::semantics_iterator it = PE->semantics_begin(),
540          et = PE->semantics_end(); it != et; ++it) {
541       Expr *Semantic = *it;
542       if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(Semantic))
543         Semantic = OVE->getSourceExpr();
544       Visit(Semantic);
545     }
546   }
547 };
548 } // end anonymous namespace
549 
550 typedef BumpVector<const VarDecl*> DeclVec;
551 
LazyInitializeReferencedDecls(const BlockDecl * BD,void * & Vec,llvm::BumpPtrAllocator & A)552 static DeclVec* LazyInitializeReferencedDecls(const BlockDecl *BD,
553                                               void *&Vec,
554                                               llvm::BumpPtrAllocator &A) {
555   if (Vec)
556     return (DeclVec*) Vec;
557 
558   BumpVectorContext BC(A);
559   DeclVec *BV = (DeclVec*) A.Allocate<DeclVec>();
560   new (BV) DeclVec(BC, 10);
561 
562   // Go through the capture list.
563   for (const auto &CI : BD->captures()) {
564     BV->push_back(CI.getVariable(), BC);
565   }
566 
567   // Find the referenced global/static variables.
568   FindBlockDeclRefExprsVals F(*BV, BC);
569   F.Visit(BD->getBody());
570 
571   Vec = BV;
572   return BV;
573 }
574 
575 llvm::iterator_range<AnalysisDeclContext::referenced_decls_iterator>
getReferencedBlockVars(const BlockDecl * BD)576 AnalysisDeclContext::getReferencedBlockVars(const BlockDecl *BD) {
577   if (!ReferencedBlockVars)
578     ReferencedBlockVars = new llvm::DenseMap<const BlockDecl*,void*>();
579 
580   const DeclVec *V =
581       LazyInitializeReferencedDecls(BD, (*ReferencedBlockVars)[BD], A);
582   return llvm::make_range(V->begin(), V->end());
583 }
584 
getAnalysisImpl(const void * tag)585 ManagedAnalysis *&AnalysisDeclContext::getAnalysisImpl(const void *tag) {
586   if (!ManagedAnalyses)
587     ManagedAnalyses = new ManagedAnalysisMap();
588   ManagedAnalysisMap *M = (ManagedAnalysisMap*) ManagedAnalyses;
589   return (*M)[tag];
590 }
591 
592 //===----------------------------------------------------------------------===//
593 // Cleanup.
594 //===----------------------------------------------------------------------===//
595 
~ManagedAnalysis()596 ManagedAnalysis::~ManagedAnalysis() {}
597 
~AnalysisDeclContext()598 AnalysisDeclContext::~AnalysisDeclContext() {
599   delete forcedBlkExprs;
600   delete ReferencedBlockVars;
601   // Release the managed analyses.
602   if (ManagedAnalyses) {
603     ManagedAnalysisMap *M = (ManagedAnalysisMap*) ManagedAnalyses;
604     llvm::DeleteContainerSeconds(*M);
605     delete M;
606   }
607 }
608 
~AnalysisDeclContextManager()609 AnalysisDeclContextManager::~AnalysisDeclContextManager() {
610   llvm::DeleteContainerSeconds(Contexts);
611 }
612 
~LocationContext()613 LocationContext::~LocationContext() {}
614 
~LocationContextManager()615 LocationContextManager::~LocationContextManager() {
616   clear();
617 }
618 
clear()619 void LocationContextManager::clear() {
620   for (llvm::FoldingSet<LocationContext>::iterator I = Contexts.begin(),
621        E = Contexts.end(); I != E; ) {
622     LocationContext *LC = &*I;
623     ++I;
624     delete LC;
625   }
626 
627   Contexts.clear();
628 }
629 
630