Replace CFGElement llvm::cast support to be well-defined.

See r175462 for another example/more details.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@175796 91177308-0d34-0410-b5e6-96231b3b80d8

17 files changed, 89 insertions, 88 deletions

diff --git a/lib/Analysis/CFG.cpp b/lib/Analysis/CFG.cpp
index 01553b884e..8754fe86a8 100644
--- a/lib/Analysis/CFG.cpp
+++ b/lib/Analysis/CFG.cpp
@@ -3338,7 +3338,7 @@ CFGImplicitDtor::getDestructorDecl(ASTContext &astContext) const {
       llvm_unreachable("getDestructorDecl should only be used with "
                        "ImplicitDtors");
     case CFGElement::AutomaticObjectDtor: {
-      const VarDecl *var = cast<CFGAutomaticObjDtor>(this)->getVarDecl();
+      const VarDecl *var = castAs<CFGAutomaticObjDtor>().getVarDecl();
       QualType ty = var->getType();
       ty = ty.getNonReferenceType();
       while (const ArrayType *arrayType = astContext.getAsArrayType(ty)) {
@@ -3351,7 +3351,7 @@ CFGImplicitDtor::getDestructorDecl(ASTContext &astContext) const {
     }
     case CFGElement::TemporaryDtor: {
       const CXXBindTemporaryExpr *bindExpr =
-        cast<CFGTemporaryDtor>(this)->getBindTemporaryExpr();
+        castAs<CFGTemporaryDtor>().getBindTemporaryExpr();
       const CXXTemporary *temp = bindExpr->getTemporary();
       return temp->getDestructor();
     }
@@ -3406,8 +3406,8 @@ static BlkExprMapTy* PopulateBlkExprMap(CFG& cfg) {
 
   for (CFG::iterator I=cfg.begin(), E=cfg.end(); I != E; ++I)
     for (CFGBlock::iterator BI=(*I)->begin(), EI=(*I)->end(); BI != EI; ++BI)
-      if (const CFGStmt *S = BI->getAs<CFGStmt>())
-        FindSubExprAssignments(S->getStmt(), SubExprAssignments);
+      if (CFGStmt S = BI->getAs<CFGStmt>())
+        FindSubExprAssignments(S.getStmt(), SubExprAssignments);
 
   for (CFG::iterator I=cfg.begin(), E=cfg.end(); I != E; ++I) {
 
@@ -3415,10 +3415,10 @@ static BlkExprMapTy* PopulateBlkExprMap(CFG& cfg) {
     // block-level that are block-level expressions.
 
     for (CFGBlock::iterator BI=(*I)->begin(), EI=(*I)->end(); BI != EI; ++BI) {
-      const CFGStmt *CS = BI->getAs<CFGStmt>();
+      CFGStmt CS = BI->getAs<CFGStmt>();
       if (!CS)
         continue;
-      if (const Expr *Exp = dyn_cast<Expr>(CS->getStmt())) {
+      if (const Expr *Exp = dyn_cast<Expr>(CS.getStmt())) {
         assert((Exp->IgnoreParens() == Exp) && "No parens on block-level exps");
 
         if (const BinaryOperator* B = dyn_cast<BinaryOperator>(Exp)) {
@@ -3531,8 +3531,8 @@ public:
       unsigned j = 1;
       for (CFGBlock::const_iterator BI = (*I)->begin(), BEnd = (*I)->end() ;
            BI != BEnd; ++BI, ++j ) {        
-        if (const CFGStmt *SE = BI->getAs<CFGStmt>()) {
-          const Stmt *stmt= SE->getStmt();
+        if (CFGStmt SE = BI->getAs<CFGStmt>()) {
+          const Stmt *stmt= SE.getStmt();
           std::pair<unsigned, unsigned> P((*I)->getBlockID(), j);
           StmtMap[stmt] = P;
 
@@ -3721,8 +3721,8 @@ public:
 
 static void print_elem(raw_ostream &OS, StmtPrinterHelper* Helper,
                        const CFGElement &E) {
-  if (const CFGStmt *CS = E.getAs<CFGStmt>()) {
-    const Stmt *S = CS->getStmt();
+  if (CFGStmt CS = E.getAs<CFGStmt>()) {
+    const Stmt *S = CS.getStmt();
     
     if (Helper) {
 
@@ -3769,8 +3769,8 @@ static void print_elem(raw_ostream &OS, StmtPrinterHelper* Helper,
     if (isa<Expr>(S))
       OS << '\n';
 
-  } else if (const CFGInitializer *IE = E.getAs<CFGInitializer>()) {
-    const CXXCtorInitializer *I = IE->getInitializer();
+  } else if (CFGInitializer IE = E.getAs<CFGInitializer>()) {
+    const CXXCtorInitializer *I = IE.getInitializer();
     if (I->isBaseInitializer())
       OS << I->getBaseClass()->getAsCXXRecordDecl()->getName();
     else OS << I->getAnyMember()->getName();
@@ -3784,8 +3784,8 @@ static void print_elem(raw_ostream &OS, StmtPrinterHelper* Helper,
       OS << " (Base initializer)\n";
     else OS << " (Member initializer)\n";
 
-  } else if (const CFGAutomaticObjDtor *DE = E.getAs<CFGAutomaticObjDtor>()){
-    const VarDecl *VD = DE->getVarDecl();
+  } else if (CFGAutomaticObjDtor DE = E.getAs<CFGAutomaticObjDtor>()){
+    const VarDecl *VD = DE.getVarDecl();
     Helper->handleDecl(VD, OS);
 
     const Type* T = VD->getType().getTypePtr();
@@ -3796,20 +3796,20 @@ static void print_elem(raw_ostream &OS, StmtPrinterHelper* Helper,
     OS << ".~" << T->getAsCXXRecordDecl()->getName().str() << "()";
     OS << " (Implicit destructor)\n";
 
-  } else if (const CFGBaseDtor *BE = E.getAs<CFGBaseDtor>()) {
-    const CXXBaseSpecifier *BS = BE->getBaseSpecifier();
+  } else if (CFGBaseDtor BE = E.getAs<CFGBaseDtor>()) {
+    const CXXBaseSpecifier *BS = BE.getBaseSpecifier();
     OS << "~" << BS->getType()->getAsCXXRecordDecl()->getName() << "()";
     OS << " (Base object destructor)\n";
 
-  } else if (const CFGMemberDtor *ME = E.getAs<CFGMemberDtor>()) {
-    const FieldDecl *FD = ME->getFieldDecl();
+  } else if (CFGMemberDtor ME = E.getAs<CFGMemberDtor>()) {
+    const FieldDecl *FD = ME.getFieldDecl();
     const Type *T = FD->getType()->getBaseElementTypeUnsafe();
     OS << "this->" << FD->getName();
     OS << ".~" << T->getAsCXXRecordDecl()->getName() << "()";
     OS << " (Member object destructor)\n";
 
-  } else if (const CFGTemporaryDtor *TE = E.getAs<CFGTemporaryDtor>()) {
-    const CXXBindTemporaryExpr *BT = TE->getBindTemporaryExpr();
+  } else if (CFGTemporaryDtor TE = E.getAs<CFGTemporaryDtor>()) {
+    const CXXBindTemporaryExpr *BT = TE.getBindTemporaryExpr();
     OS << "~" << BT->getType()->getAsCXXRecordDecl()->getName() << "()";
     OS << " (Temporary object destructor)\n";
   }
diff --git a/lib/Analysis/CFGStmtMap.cpp b/lib/Analysis/CFGStmtMap.cpp
index 16df67678d..7daeef9216 100644
--- a/lib/Analysis/CFGStmtMap.cpp
+++ b/lib/Analysis/CFGStmtMap.cpp
@@ -50,11 +50,11 @@ static void Accumulate(SMap &SM, CFGBlock *B) {
   // First walk the block-level expressions.
   for (CFGBlock::iterator I = B->begin(), E = B->end(); I != E; ++I) {
     const CFGElement &CE = *I;
-    const CFGStmt *CS = CE.getAs<CFGStmt>();
+    CFGStmt CS = CE.getAs<CFGStmt>();
     if (!CS)
       continue;
     
-    CFGBlock *&Entry = SM[CS->getStmt()];
+    CFGBlock *&Entry = SM[CS.getStmt()];
     // If 'Entry' is already initialized (e.g., a terminator was already),
     // skip.
     if (Entry)
diff --git a/lib/Analysis/LiveVariables.cpp b/lib/Analysis/LiveVariables.cpp
index 1f616f7a5d..519d5288b8 100644
--- a/lib/Analysis/LiveVariables.cpp
+++ b/lib/Analysis/LiveVariables.cpp
@@ -474,15 +474,15 @@ LiveVariablesImpl::runOnBlock(const CFGBlock *block,
        ei = block->rend(); it != ei; ++it) {
     const CFGElement &elem = *it;
 
-    if (const CFGAutomaticObjDtor *Dtor = dyn_cast<CFGAutomaticObjDtor>(&elem)){
-      val.liveDecls = DSetFact.add(val.liveDecls, Dtor->getVarDecl());
+    if (CFGAutomaticObjDtor Dtor = elem.getAs<CFGAutomaticObjDtor>()){
+      val.liveDecls = DSetFact.add(val.liveDecls, Dtor.getVarDecl());
       continue;
     }
 
-    if (!isa<CFGStmt>(elem))
+    if (!elem.getAs<CFGStmt>())
       continue;
     
-    const Stmt *S = cast<CFGStmt>(elem).getStmt();
+    const Stmt *S = elem.castAs<CFGStmt>().getStmt();
     TF.Visit(const_cast<Stmt*>(S));
     stmtsToLiveness[S] = val;
   }
@@ -534,8 +534,8 @@ LiveVariables::computeLiveness(AnalysisDeclContext &AC,
     if (killAtAssign)
       for (CFGBlock::const_iterator bi = block->begin(), be = block->end();
            bi != be; ++bi) {
-        if (const CFGStmt *cs = bi->getAs<CFGStmt>()) {
-          if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(cs->getStmt())) {
+        if (CFGStmt cs = bi->getAs<CFGStmt>()) {
+          if (const BinaryOperator *BO = dyn_cast<BinaryOperator>(cs.getStmt())) {
             if (BO->getOpcode() == BO_Assign) {
               if (const DeclRefExpr *DR =
                     dyn_cast<DeclRefExpr>(BO->getLHS()->IgnoreParens())) {
diff --git a/lib/Analysis/ReachableCode.cpp b/lib/Analysis/ReachableCode.cpp
index 7bf01bbbe8..f85e2dee52 100644
--- a/lib/Analysis/ReachableCode.cpp
+++ b/lib/Analysis/ReachableCode.cpp
@@ -95,8 +95,8 @@ static bool isValidDeadStmt(const Stmt *S) {
 
 const Stmt *DeadCodeScan::findDeadCode(const clang::CFGBlock *Block) {
   for (CFGBlock::const_iterator I = Block->begin(), E = Block->end(); I!=E; ++I)
-    if (const CFGStmt *CS = I->getAs<CFGStmt>()) {
-      const Stmt *S = CS->getStmt();
+    if (CFGStmt CS = I->getAs<CFGStmt>()) {
+      const Stmt *S = CS.getStmt();
       if (isValidDeadStmt(S))
         return S;
     }
diff --git a/lib/Analysis/ThreadSafety.cpp b/lib/Analysis/ThreadSafety.cpp
index 20d8f97e2d..2e3abc07b7 100644
--- a/lib/Analysis/ThreadSafety.cpp
+++ b/lib/Analysis/ThreadSafety.cpp
@@ -1350,8 +1350,8 @@ void LocalVariableMap::traverseCFG(CFG *CFGraph,
          BE = CurrBlock->end(); BI != BE; ++BI) {
       switch (BI->getKind()) {
         case CFGElement::Statement: {
-          const CFGStmt *CS = cast<CFGStmt>(&*BI);
-          VMapBuilder.Visit(const_cast<Stmt*>(CS->getStmt()));
+          CFGStmt CS = BI->castAs<CFGStmt>();
+          VMapBuilder.Visit(const_cast<Stmt*>(CS.getStmt()));
           break;
         }
         default:
@@ -1397,8 +1397,8 @@ static void findBlockLocations(CFG *CFGraph,
       for (CFGBlock::const_reverse_iterator BI = CurrBlock->rbegin(),
            BE = CurrBlock->rend(); BI != BE; ++BI) {
         // FIXME: Handle other CFGElement kinds.
-        if (const CFGStmt *CS = dyn_cast<CFGStmt>(&*BI)) {
-          CurrBlockInfo->ExitLoc = CS->getStmt()->getLocStart();
+        if (CFGStmt CS = BI->getAs<CFGStmt>()) {
+          CurrBlockInfo->ExitLoc = CS.getStmt()->getLocStart();
           break;
         }
       }
@@ -1410,8 +1410,8 @@ static void findBlockLocations(CFG *CFGraph,
       for (CFGBlock::const_iterator BI = CurrBlock->begin(),
            BE = CurrBlock->end(); BI != BE; ++BI) {
         // FIXME: Handle other CFGElement kinds.
-        if (const CFGStmt *CS = dyn_cast<CFGStmt>(&*BI)) {
-          CurrBlockInfo->EntryLoc = CS->getStmt()->getLocStart();
+        if (CFGStmt CS = BI->getAs<CFGStmt>()) {
+          CurrBlockInfo->EntryLoc = CS.getStmt()->getLocStart();
           break;
         }
       }
@@ -2234,8 +2234,8 @@ inline bool neverReturns(const CFGBlock* B) {
     return false;
 
   CFGElement Last = B->back();
-  if (CFGStmt* S = dyn_cast<CFGStmt>(&Last)) {
-    if (isa<CXXThrowExpr>(S->getStmt()))
+  if (CFGStmt S = Last.getAs<CFGStmt>()) {
+    if (isa<CXXThrowExpr>(S.getStmt()))
       return true;
   }
   return false;
@@ -2444,22 +2444,22 @@ void ThreadSafetyAnalyzer::runAnalysis(AnalysisDeclContext &AC) {
          BE = CurrBlock->end(); BI != BE; ++BI) {
       switch (BI->getKind()) {
         case CFGElement::Statement: {
-          const CFGStmt *CS = cast<CFGStmt>(&*BI);
-          LocksetBuilder.Visit(const_cast<Stmt*>(CS->getStmt()));
+          CFGStmt CS = BI->castAs<CFGStmt>();
+          LocksetBuilder.Visit(const_cast<Stmt*>(CS.getStmt()));
           break;
         }
         // Ignore BaseDtor, MemberDtor, and TemporaryDtor for now.
         case CFGElement::AutomaticObjectDtor: {
-          const CFGAutomaticObjDtor *AD = cast<CFGAutomaticObjDtor>(&*BI);
-          CXXDestructorDecl *DD = const_cast<CXXDestructorDecl*>(
-            AD->getDestructorDecl(AC.getASTContext()));
+          CFGAutomaticObjDtor AD = BI->castAs<CFGAutomaticObjDtor>();
+          CXXDestructorDecl *DD = const_cast<CXXDestructorDecl *>(
+              AD.getDestructorDecl(AC.getASTContext()));
           if (!DD->hasAttrs())
             break;
 
           // Create a dummy expression,
-          VarDecl *VD = const_cast<VarDecl*>(AD->getVarDecl());
+          VarDecl *VD = const_cast<VarDecl*>(AD.getVarDecl());
           DeclRefExpr DRE(VD, false, VD->getType(), VK_LValue,
-                          AD->getTriggerStmt()->getLocEnd());
+                          AD.getTriggerStmt()->getLocEnd());
           LocksetBuilder.handleCall(&DRE, DD);
           break;
         }
diff --git a/lib/Analysis/UninitializedValues.cpp b/lib/Analysis/UninitializedValues.cpp
index 13af4353cd..022bb7d513 100644
--- a/lib/Analysis/UninitializedValues.cpp
+++ b/lib/Analysis/UninitializedValues.cpp
@@ -746,8 +746,8 @@ static bool runOnBlock(const CFGBlock *block, const CFG &cfg,
   TransferFunctions tf(vals, cfg, block, ac, classification, handler);
   for (CFGBlock::const_iterator I = block->begin(), E = block->end(); 
        I != E; ++I) {
-    if (const CFGStmt *cs = dyn_cast<CFGStmt>(&*I)) {
-      tf.Visit(const_cast<Stmt*>(cs->getStmt()));
+    if (CFGStmt cs = I->getAs<CFGStmt>()) {
+      tf.Visit(const_cast<Stmt*>(cs.getStmt()));
     }
   }
   return vals.updateValueVectorWithScratch(block);
diff --git a/lib/Sema/AnalysisBasedWarnings.cpp b/lib/Sema/AnalysisBasedWarnings.cpp
index e9cf7ccd85..9a67d4991f 100644
--- a/lib/Sema/AnalysisBasedWarnings.cpp
+++ b/lib/Sema/AnalysisBasedWarnings.cpp
@@ -158,7 +158,7 @@ static ControlFlowKind CheckFallThrough(AnalysisDeclContext &AC) {
     CFGBlock::const_reverse_iterator ri = B.rbegin(), re = B.rend();
 
     for ( ; ri != re ; ++ri)
-      if (isa<CFGStmt>(*ri))
+      if (ri->getAs<CFGStmt>())
         break;
 
     // No more CFGElements in the block?
@@ -172,7 +172,7 @@ static ControlFlowKind CheckFallThrough(AnalysisDeclContext &AC) {
       continue;
     }
 
-    CFGStmt CS = cast<CFGStmt>(*ri);
+    CFGStmt CS = ri->castAs<CFGStmt>();
     const Stmt *S = CS.getStmt();
     if (isa<ReturnStmt>(S)) {
       HasLiveReturn = true;
@@ -762,8 +762,8 @@ namespace {
           for (CFGBlock::const_reverse_iterator ElemIt = P->rbegin(),
                                                 ElemEnd = P->rend();
                ElemIt != ElemEnd; ++ElemIt) {
-            if (const CFGStmt *CS = ElemIt->getAs<CFGStmt>()) {
-              if (const AttributedStmt *AS = asFallThroughAttr(CS->getStmt())) {
+            if (CFGStmt CS = ElemIt->getAs<CFGStmt>()) {
+              if (const AttributedStmt *AS = asFallThroughAttr(CS.getStmt())) {
                 S.Diag(AS->getLocStart(),
                        diag::warn_fallthrough_attr_unreachable);
                 markFallthroughVisited(AS);
@@ -833,8 +833,8 @@ namespace {
       for (CFGBlock::const_reverse_iterator ElemIt = B.rbegin(),
                                             ElemEnd = B.rend();
                                             ElemIt != ElemEnd; ++ElemIt) {
-        if (const CFGStmt *CS = ElemIt->getAs<CFGStmt>())
-          return CS->getStmt();
+        if (CFGStmt CS = ElemIt->getAs<CFGStmt>())
+          return CS.getStmt();
       }
       // Workaround to detect a statement thrown out by CFGBuilder:
       //   case X: {} case Y:
diff --git a/lib/StaticAnalyzer/Checkers/AnalyzerStatsChecker.cpp b/lib/StaticAnalyzer/Checkers/AnalyzerStatsChecker.cpp
index dffa85f7c5..0a12854db8 100644
--- a/lib/StaticAnalyzer/Checkers/AnalyzerStatsChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/AnalyzerStatsChecker.cpp
@@ -123,13 +123,13 @@ void AnalyzerStatsChecker::checkEndAnalysis(ExplodedGraph &G,
     const BlockEdge &BE =  I->first;
     const CFGBlock *Exit = BE.getDst();
     const CFGElement &CE = Exit->front();
-    if (const CFGStmt *CS = dyn_cast<CFGStmt>(&CE)) {
+    if (CFGStmt CS = CE.getAs<CFGStmt>()) {
       SmallString<128> bufI;
       llvm::raw_svector_ostream outputI(bufI);
       outputI << "(" << NameOfRootFunction << ")" <<
                  ": The analyzer generated a sink at this point";
       B.EmitBasicReport(D, "Sink Point", "Internal Statistics", outputI.str(),
-                        PathDiagnosticLocation::createBegin(CS->getStmt(),
+                        PathDiagnosticLocation::createBegin(CS.getStmt(),
                                                             SM, LC));
     }
   }
diff --git a/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp b/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp
index e8ad775cf4..7b63d67911 100644
--- a/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/MallocOverflowSecurityChecker.cpp
@@ -236,8 +236,8 @@ void MallocOverflowSecurityChecker::checkASTCodeBody(const Decl *D,
     CFGBlock *block = *it;
     for (CFGBlock::iterator bi = block->begin(), be = block->end();
          bi != be; ++bi) {
-      if (const CFGStmt *CS = bi->getAs<CFGStmt>()) {
-        if (const CallExpr *TheCall = dyn_cast<CallExpr>(CS->getStmt())) {
+      if (CFGStmt CS = bi->getAs<CFGStmt>()) {
+        if (const CallExpr *TheCall = dyn_cast<CallExpr>(CS.getStmt())) {
           // Get the callee.
           const FunctionDecl *FD = TheCall->getDirectCallee();
 
diff --git a/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp b/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
index e2d14e19fe..c939d05df4 100644
--- a/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
+++ b/lib/StaticAnalyzer/Checkers/UnreachableCodeChecker.cpp
@@ -131,8 +131,8 @@ void UnreachableCodeChecker::checkEndAnalysis(ExplodedGraph &G,
       bool foundUnreachable = false;
       for (CFGBlock::const_iterator ci = CB->begin(), ce = CB->end();
            ci != ce; ++ci) {
-        if (const CFGStmt *S = (*ci).getAs<CFGStmt>())
-          if (const CallExpr *CE = dyn_cast<CallExpr>(S->getStmt())) {
+        if (CFGStmt S = (*ci).getAs<CFGStmt>())
+          if (const CallExpr *CE = dyn_cast<CallExpr>(S.getStmt())) {
             if (CE->isBuiltinCall() == Builtin::BI__builtin_unreachable) {
               foundUnreachable = true;
               break;
@@ -189,8 +189,8 @@ void UnreachableCodeChecker::FindUnreachableEntryPoints(const CFGBlock *CB,
 // Find the Stmt* in a CFGBlock for reporting a warning
 const Stmt *UnreachableCodeChecker::getUnreachableStmt(const CFGBlock *CB) {
   for (CFGBlock::const_iterator I = CB->begin(), E = CB->end(); I != E; ++I) {
-    if (const CFGStmt *S = I->getAs<CFGStmt>())
-      return S->getStmt();
+    if (CFGStmt S = I->getAs<CFGStmt>())
+      return S.getStmt();
   }
   if (const Stmt *S = CB->getTerminator())
     return S;
diff --git a/lib/StaticAnalyzer/Core/BugReporter.cpp b/lib/StaticAnalyzer/Core/BugReporter.cpp
index 6ae73b58c0..d43d525f76 100644
--- a/lib/StaticAnalyzer/Core/BugReporter.cpp
+++ b/lib/StaticAnalyzer/Core/BugReporter.cpp
@@ -1482,8 +1482,8 @@ static bool GenerateExtensivePathDiagnostic(PathDiagnostic& PD,
 
       if (const BlockEntrance *BE = dyn_cast<BlockEntrance>(&P)) {
         CFGElement First = BE->getFirstElement();
-        if (const CFGStmt *S = First.getAs<CFGStmt>()) {
-          const Stmt *stmt = S->getStmt();
+        if (CFGStmt S = First.getAs<CFGStmt>()) {
+          const Stmt *stmt = S.getStmt();
           if (IsControlFlowExpr(stmt)) {
             // Add the proper context for '&&', '||', and '?'.
             EB.addContext(stmt);
diff --git a/lib/StaticAnalyzer/Core/CallEvent.cpp b/lib/StaticAnalyzer/Core/CallEvent.cpp
index c5e3c051da..3293515544 100644
--- a/lib/StaticAnalyzer/Core/CallEvent.cpp
+++ b/lib/StaticAnalyzer/Core/CallEvent.cpp
@@ -961,8 +961,9 @@ CallEventManager::getCaller(const StackFrameContext *CalleeCtx,
   // destructors, though this could change in the future.
   const CFGBlock *B = CalleeCtx->getCallSiteBlock();
   CFGElement E = (*B)[CalleeCtx->getIndex()];
-  assert(isa<CFGImplicitDtor>(E) && "All other CFG elements should have exprs");
-  assert(!isa<CFGTemporaryDtor>(E) && "We don't handle temporaries yet");
+  assert(E.getAs<CFGImplicitDtor>() &&
+         "All other CFG elements should have exprs");
+  assert(!E.getAs<CFGTemporaryDtor>() && "We don't handle temporaries yet");
 
   SValBuilder &SVB = State->getStateManager().getSValBuilder();
   const CXXDestructorDecl *Dtor = cast<CXXDestructorDecl>(CalleeCtx->getDecl());
@@ -970,11 +971,11 @@ CallEventManager::getCaller(const StackFrameContext *CalleeCtx,
   SVal ThisVal = State->getSVal(ThisPtr);
 
   const Stmt *Trigger;
-  if (const CFGAutomaticObjDtor *AutoDtor = dyn_cast<CFGAutomaticObjDtor>(&E))
-    Trigger = AutoDtor->getTriggerStmt();
+  if (CFGAutomaticObjDtor AutoDtor = E.getAs<CFGAutomaticObjDtor>())
+    Trigger = AutoDtor.getTriggerStmt();
   else
     Trigger = Dtor->getBody();
 
   return getCXXDestructorCall(Dtor, Trigger, ThisVal.getAsRegion(),
-                              isa<CFGBaseDtor>(E), State, CallerCtx);
+                              E.getAs<CFGBaseDtor>(), State, CallerCtx);
 }
diff --git a/lib/StaticAnalyzer/Core/CoreEngine.cpp b/lib/StaticAnalyzer/Core/CoreEngine.cpp
index 297ad0d046..5d819baaeb 100644
--- a/lib/StaticAnalyzer/Core/CoreEngine.cpp
+++ b/lib/StaticAnalyzer/Core/CoreEngine.cpp
@@ -515,7 +515,7 @@ void CoreEngine::enqueueStmtNode(ExplodedNode *N,
   }
 
   // At this point, we know we're processing a normal statement.
-  CFGStmt CS = cast<CFGStmt>((*Block)[Idx]);
+  CFGStmt CS = (*Block)[Idx].castAs<CFGStmt>();
   PostStmt Loc(CS.getStmt(), N->getLocationContext());
 
   if (Loc == N->getLocation()) {
diff --git a/lib/StaticAnalyzer/Core/ExprEngine.cpp b/lib/StaticAnalyzer/Core/ExprEngine.cpp
index d03f3bd048..3e5fd06bea 100644
--- a/lib/StaticAnalyzer/Core/ExprEngine.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngine.cpp
@@ -225,16 +225,16 @@ void ExprEngine::processCFGElement(const CFGElement E, ExplodedNode *Pred,
     case CFGElement::Invalid:
       llvm_unreachable("Unexpected CFGElement kind.");
     case CFGElement::Statement:
-      ProcessStmt(const_cast<Stmt*>(E.getAs<CFGStmt>()->getStmt()), Pred);
+      ProcessStmt(const_cast<Stmt*>(E.castAs<CFGStmt>().getStmt()), Pred);
       return;
     case CFGElement::Initializer:
-      ProcessInitializer(E.getAs<CFGInitializer>()->getInitializer(), Pred);
+      ProcessInitializer(E.castAs<CFGInitializer>().getInitializer(), Pred);
       return;
     case CFGElement::AutomaticObjectDtor:
     case CFGElement::BaseDtor:
     case CFGElement::MemberDtor:
     case CFGElement::TemporaryDtor:
-      ProcessImplicitDtor(*E.getAs<CFGImplicitDtor>(), Pred);
+      ProcessImplicitDtor(E.castAs<CFGImplicitDtor>(), Pred);
       return;
   }
   currBldrCtx = 0;
@@ -440,16 +440,16 @@ void ExprEngine::ProcessImplicitDtor(const CFGImplicitDtor D,
   ExplodedNodeSet Dst;
   switch (D.getKind()) {
   case CFGElement::AutomaticObjectDtor:
-    ProcessAutomaticObjDtor(cast<CFGAutomaticObjDtor>(D), Pred, Dst);
+    ProcessAutomaticObjDtor(D.castAs<CFGAutomaticObjDtor>(), Pred, Dst);
     break;
   case CFGElement::BaseDtor:
-    ProcessBaseDtor(cast<CFGBaseDtor>(D), Pred, Dst);
+    ProcessBaseDtor(D.castAs<CFGBaseDtor>(), Pred, Dst);
     break;
   case CFGElement::MemberDtor:
-    ProcessMemberDtor(cast<CFGMemberDtor>(D), Pred, Dst);
+    ProcessMemberDtor(D.castAs<CFGMemberDtor>(), Pred, Dst);
     break;
   case CFGElement::TemporaryDtor:
-    ProcessTemporaryDtor(cast<CFGTemporaryDtor>(D), Pred, Dst);
+    ProcessTemporaryDtor(D.castAs<CFGTemporaryDtor>(), Pred, Dst);
     break;
   default:
     llvm_unreachable("Unexpected dtor kind.");
@@ -1200,10 +1200,10 @@ static const Stmt *ResolveCondition(const Stmt *Condition,
   CFGBlock::const_reverse_iterator I = B->rbegin(), E = B->rend();
   for (; I != E; ++I) {
     CFGElement Elem = *I;
-    CFGStmt *CS = dyn_cast<CFGStmt>(&Elem);
+    CFGStmt CS = Elem.getAs<CFGStmt>();
     if (!CS)
       continue;
-    if (CS->getStmt() != Condition)
+    if (CS.getStmt() != Condition)
       break;
     return Condition;
   }
diff --git a/lib/StaticAnalyzer/Core/ExprEngineC.cpp b/lib/StaticAnalyzer/Core/ExprEngineC.cpp
index b93dfe1619..5b3a518759 100644
--- a/lib/StaticAnalyzer/Core/ExprEngineC.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngineC.cpp
@@ -554,7 +554,7 @@ void ExprEngine::VisitLogicalExpr(const BinaryOperator* B, ExplodedNode *Pred,
     // in SrcBlock is the value of the enclosing expression.
     // However, we still need to constrain that value to be 0 or 1.
     assert(!SrcBlock->empty());
-    CFGStmt Elem = cast<CFGStmt>(*SrcBlock->rbegin());
+    CFGStmt Elem = SrcBlock->rbegin()->castAs<CFGStmt>();
     const Expr *RHS = cast<Expr>(Elem.getStmt());
     SVal RHSVal = N->getState()->getSVal(RHS, Pred->getLocationContext());
 
@@ -659,8 +659,8 @@ void ExprEngine::VisitGuardedExpr(const Expr *Ex,
   for (CFGBlock::const_reverse_iterator I = SrcBlock->rbegin(),
                                         E = SrcBlock->rend(); I != E; ++I) {
     CFGElement CE = *I;
-    if (CFGStmt *CS = dyn_cast<CFGStmt>(&CE)) {
-      const Expr *ValEx = cast<Expr>(CS->getStmt());
+    if (CFGStmt CS = CE.getAs<CFGStmt>()) {
+      const Expr *ValEx = cast<Expr>(CS.getStmt());
       hasValue = true;
       V = state->getSVal(ValEx, LCtx);
       break;
diff --git a/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp b/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
index d7cb5d1878..43184cfd82 100644
--- a/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
+++ b/lib/StaticAnalyzer/Core/ExprEngineCXX.cpp
@@ -96,8 +96,8 @@ void ExprEngine::VisitCXXConstructExpr(const CXXConstructExpr *CE,
       CFGElement Next = (*B)[currStmtIdx+1];
 
       // Is this a constructor for a local variable?
-      if (const CFGStmt *StmtElem = dyn_cast<CFGStmt>(&Next)) {
-        if (const DeclStmt *DS = dyn_cast<DeclStmt>(StmtElem->getStmt())) {
+      if (CFGStmt StmtElem = Next.getAs<CFGStmt>()) {
+        if (const DeclStmt *DS = dyn_cast<DeclStmt>(StmtElem.getStmt())) {
           if (const VarDecl *Var = dyn_cast<VarDecl>(DS->getSingleDecl())) {
             if (Var->getInit()->IgnoreImplicit() == CE) {
               QualType Ty = Var->getType();
@@ -119,8 +119,8 @@ void ExprEngine::VisitCXXConstructExpr(const CXXConstructExpr *CE,
       }
       
       // Is this a constructor for a member?
-      if (const CFGInitializer *InitElem = dyn_cast<CFGInitializer>(&Next)) {
-        const CXXCtorInitializer *Init = InitElem->getInitializer();
+      if (CFGInitializer InitElem = Next.getAs<CFGInitializer>()) {
+        const CXXCtorInitializer *Init = InitElem.getInitializer();
         assert(Init->isAnyMemberInitializer());
 
         const CXXMethodDecl *CurCtor = cast<CXXMethodDecl>(LCtx->getDecl());
diff --git a/lib/StaticAnalyzer/Core/PathDiagnostic.cpp b/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
index 69a4e2706a..12d85db7cb 100644
--- a/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
+++ b/lib/StaticAnalyzer/Core/PathDiagnostic.cpp
@@ -479,15 +479,15 @@ getLocationForCaller(const StackFrameContext *SFC,
   case CFGElement::Invalid:
     llvm_unreachable("Invalid CFGElement");
   case CFGElement::Statement:
-    return PathDiagnosticLocation(cast<CFGStmt>(Source).getStmt(),
+    return PathDiagnosticLocation(Source.castAs<CFGStmt>().getStmt(),
                                   SM, CallerCtx);
   case CFGElement::Initializer: {
-    const CFGInitializer &Init = cast<CFGInitializer>(Source);
+    const CFGInitializer &Init = Source.castAs<CFGInitializer>();
     return PathDiagnosticLocation(Init.getInitializer()->getInit(),
                                   SM, CallerCtx);
   }
   case CFGElement::AutomaticObjectDtor: {
-    const CFGAutomaticObjDtor &Dtor = cast<CFGAutomaticObjDtor>(Source);
+    const CFGAutomaticObjDtor &Dtor = Source.castAs<CFGAutomaticObjDtor>();
     return PathDiagnosticLocation::createEnd(Dtor.getTriggerStmt(),
                                              SM, CallerCtx);
   }