Use ranges to concisely express iteration

No functional change is intended, this should just clean things up a
little.

llvm-svn: 273522

18 files changed, 123 insertions, 184 deletions

diff --git a/clang/include/clang/AST/Expr.h b/clang/include/clang/AST/Expr.h
index bdfefc8a4f92..5d050b0ec65f 100644
--- a/clang/include/clang/AST/Expr.h
+++ b/clang/include/clang/AST/Expr.h
@@ -3970,11 +3970,10 @@ private:
   /// expression.
   Designator *Designators;
 
-
-  DesignatedInitExpr(const ASTContext &C, QualType Ty, unsigned NumDesignators,
-                     const Designator *Designators,
+  DesignatedInitExpr(const ASTContext &C, QualType Ty,
+                     llvm::ArrayRef<Designator> Designators,
                      SourceLocation EqualOrColonLoc, bool GNUSyntax,
-                     ArrayRef<Expr*> IndexExprs, Expr *Init);
+                     ArrayRef<Expr *> IndexExprs, Expr *Init);
 
   explicit DesignatedInitExpr(unsigned NumSubExprs)
     : Expr(DesignatedInitExprClass, EmptyShell()),
@@ -4134,8 +4133,7 @@ public:
   };
 
   static DesignatedInitExpr *Create(const ASTContext &C,
-                                    Designator *Designators,
-                                    unsigned NumDesignators,
+                                    llvm::ArrayRef<Designator> Designators,
                                     ArrayRef<Expr*> IndexExprs,
                                     SourceLocation EqualOrColonLoc,
                                     bool GNUSyntax, Expr *Init);
@@ -4147,48 +4145,15 @@ public:
   unsigned size() const { return NumDesignators; }
 
   // Iterator access to the designators.
-  typedef Designator *designators_iterator;
-  designators_iterator designators_begin() { return Designators; }
-  designators_iterator designators_end() {
-    return Designators + NumDesignators;
-  }
-
-  typedef const Designator *const_designators_iterator;
-  const_designators_iterator designators_begin() const { return Designators; }
-  const_designators_iterator designators_end() const {
-    return Designators + NumDesignators;
+  llvm::MutableArrayRef<Designator> designators() {
+    return {Designators, NumDesignators};
   }
 
-  typedef llvm::iterator_range<designators_iterator> designators_range;
-  designators_range designators() {
-    return designators_range(designators_begin(), designators_end());
-  }
-
-  typedef llvm::iterator_range<const_designators_iterator>
-          designators_const_range;
-  designators_const_range designators() const {
-    return designators_const_range(designators_begin(), designators_end());
-  }
-
-  typedef std::reverse_iterator<designators_iterator>
-          reverse_designators_iterator;
-  reverse_designators_iterator designators_rbegin() {
-    return reverse_designators_iterator(designators_end());
-  }
-  reverse_designators_iterator designators_rend() {
-    return reverse_designators_iterator(designators_begin());
-  }
-
-  typedef std::reverse_iterator<const_designators_iterator>
-          const_reverse_designators_iterator;
-  const_reverse_designators_iterator designators_rbegin() const {
-    return const_reverse_designators_iterator(designators_end());
-  }
-  const_reverse_designators_iterator designators_rend() const {
-    return const_reverse_designators_iterator(designators_begin());
+  llvm::ArrayRef<Designator> designators() const {
+    return {Designators, NumDesignators};
   }
 
-  Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; }
+  Designator *getDesignator(unsigned Idx) { return &designators()[Idx]; }
 
   void setDesignators(const ASTContext &C, const Designator *Desigs,
                       unsigned NumDesigs);
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index 05f96fd4328c..a70b38fc9026 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -5430,19 +5430,17 @@ Expr *ASTNodeImporter::VisitDesignatedInitExpr(DesignatedInitExpr *DIE) {
   }
 
   SmallVector<Designator, 4> Designators(DIE->size());
-  std::transform(DIE->designators_begin(), DIE->designators_end(),
-                 Designators.begin(),
-    [this](const Designator &D) -> Designator {
-      return ImportDesignator(D);
-    });
+  llvm::transform(DIE->designators(), Designators.begin(),
+                  [this](const Designator &D) -> Designator {
+                    return ImportDesignator(D);
+                  });
 
-  for (auto I = DIE->designators_begin(), E = DIE->designators_end(); I != E;
-       ++I)
-    if (I->isFieldDesignator() && !I->getFieldName())
+  for (const Designator &D : DIE->designators())
+    if (D.isFieldDesignator() && !D.getFieldName())
       return nullptr;
 
   return DesignatedInitExpr::Create(
-        Importer.getToContext(), Designators.data(), Designators.size(),
+        Importer.getToContext(), Designators,
         IndexExprs, Importer.Import(DIE->getEqualOrColonLoc()),
         DIE->usesGNUSyntax(), Init);
 }
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 98bc36bbbdd4..09ba90a3ea0d 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -1422,16 +1422,15 @@ void NamedDecl::printQualifiedName(raw_ostream &OS,
     Ctx = Ctx->getParent();
   }
 
-  for (ContextsTy::reverse_iterator I = Contexts.rbegin(), E = Contexts.rend();
-       I != E; ++I) {
-    if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(*I)) {
+  for (const DeclContext *DC : reverse(Contexts)) {
+    if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
       OS << Spec->getName();
       const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
       TemplateSpecializationType::PrintTemplateArgumentList(OS,
                                                             TemplateArgs.data(),
                                                             TemplateArgs.size(),
                                                             P);
-    } else if (const auto *ND = dyn_cast<NamespaceDecl>(*I)) {
+    } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
       if (P.SuppressUnwrittenScope &&
           (ND->isAnonymousNamespace() || ND->isInline()))
         continue;
@@ -1441,12 +1440,12 @@ void NamedDecl::printQualifiedName(raw_ostream &OS,
       }
       else
         OS << *ND;
-    } else if (const auto *RD = dyn_cast<RecordDecl>(*I)) {
+    } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
       if (!RD->getIdentifier())
         OS << "(anonymous " << RD->getKindName() << ')';
       else
         OS << *RD;
-    } else if (const auto *FD = dyn_cast<FunctionDecl>(*I)) {
+    } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
       const FunctionProtoType *FT = nullptr;
       if (FD->hasWrittenPrototype())
         FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
@@ -1467,7 +1466,7 @@ void NamedDecl::printQualifiedName(raw_ostream &OS,
         }
       }
       OS << ')';
-    } else if (const auto *ED = dyn_cast<EnumDecl>(*I)) {
+    } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
       // C++ [dcl.enum]p10: Each enum-name and each unscoped
       // enumerator is declared in the scope that immediately contains
       // the enum-specifier. Each scoped enumerator is declared in the
@@ -1477,7 +1476,7 @@ void NamedDecl::printQualifiedName(raw_ostream &OS,
       else
         continue;
     } else {
-      OS << *cast<NamedDecl>(*I);
+      OS << *cast<NamedDecl>(DC);
     }
     OS << "::";
   }
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index dc87c0a8e265..5ef6d9d59fa5 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -3510,8 +3510,7 @@ IdentifierInfo *DesignatedInitExpr::Designator::getFieldName() const {
 }
 
 DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
-                                       unsigned NumDesignators,
-                                       const Designator *Designators,
+                                       llvm::ArrayRef<Designator> Designators,
                                        SourceLocation EqualOrColonLoc,
                                        bool GNUSyntax,
                                        ArrayRef<Expr*> IndexExprs,
@@ -3522,7 +3521,7 @@ DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
          Init->isInstantiationDependent(),
          Init->containsUnexpandedParameterPack()),
     EqualOrColonLoc(EqualOrColonLoc), GNUSyntax(GNUSyntax),
-    NumDesignators(NumDesignators), NumSubExprs(IndexExprs.size() + 1) {
+    NumDesignators(Designators.size()), NumSubExprs(IndexExprs.size() + 1) {
   this->Designators = new (C) Designator[NumDesignators];
 
   // Record the initializer itself.
@@ -3576,14 +3575,14 @@ DesignatedInitExpr::DesignatedInitExpr(const ASTContext &C, QualType Ty,
 }
 
 DesignatedInitExpr *
-DesignatedInitExpr::Create(const ASTContext &C, Designator *Designators,
-                           unsigned NumDesignators,
+DesignatedInitExpr::Create(const ASTContext &C,
+                           llvm::ArrayRef<Designator> Designators,
                            ArrayRef<Expr*> IndexExprs,
                            SourceLocation ColonOrEqualLoc,
                            bool UsesColonSyntax, Expr *Init) {
   void *Mem = C.Allocate(totalSizeToAlloc<Stmt *>(IndexExprs.size() + 1),
                          llvm::alignOf<DesignatedInitExpr>());
-  return new (Mem) DesignatedInitExpr(C, C.VoidTy, NumDesignators, Designators,
+  return new (Mem) DesignatedInitExpr(C, C.VoidTy, Designators,
                                       ColonOrEqualLoc, UsesColonSyntax,
                                       IndexExprs, Init);
 }
@@ -3614,8 +3613,8 @@ SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
 
 SourceLocation DesignatedInitExpr::getLocStart() const {
   SourceLocation StartLoc;
-  Designator &First =
-    *const_cast<DesignatedInitExpr*>(this)->designators_begin();
+  auto *DIE = const_cast<DesignatedInitExpr *>(this);
+  Designator &First = *DIE->getDesignator(0);
   if (First.isFieldDesignator()) {
     if (GNUSyntax)
       StartLoc = SourceLocation::getFromRawEncoding(First.Field.FieldLoc);
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index 2e15c81cccd7..d5b7e1083952 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -1642,26 +1642,24 @@ void StmtPrinter::VisitParenListExpr(ParenListExpr* Node) {
 
 void StmtPrinter::VisitDesignatedInitExpr(DesignatedInitExpr *Node) {
   bool NeedsEquals = true;
-  for (DesignatedInitExpr::designators_iterator D = Node->designators_begin(),
-                      DEnd = Node->designators_end();
-       D != DEnd; ++D) {
-    if (D->isFieldDesignator()) {
-      if (D->getDotLoc().isInvalid()) {
-        if (IdentifierInfo *II = D->getFieldName()) {
+  for (const DesignatedInitExpr::Designator &D : Node->designators()) {
+    if (D.isFieldDesignator()) {
+      if (D.getDotLoc().isInvalid()) {
+        if (IdentifierInfo *II = D.getFieldName()) {
           OS << II->getName() << ":";
           NeedsEquals = false;
         }
       } else {
-        OS << "." << D->getFieldName()->getName();
+        OS << "." << D.getFieldName()->getName();
       }
     } else {
       OS << "[";
-      if (D->isArrayDesignator()) {
-        PrintExpr(Node->getArrayIndex(*D));
+      if (D.isArrayDesignator()) {
+        PrintExpr(Node->getArrayIndex(D));
       } else {
-        PrintExpr(Node->getArrayRangeStart(*D));
+        PrintExpr(Node->getArrayRangeStart(D));
         OS << " ... ";
-        PrintExpr(Node->getArrayRangeEnd(*D));
+        PrintExpr(Node->getArrayRangeEnd(D));
       }
       OS << "]";
     }
diff --git a/clang/lib/AST/StmtProfile.cpp b/clang/lib/AST/StmtProfile.cpp
index f68bc3a397f7..fd365843c2fa 100644
--- a/clang/lib/AST/StmtProfile.cpp
+++ b/clang/lib/AST/StmtProfile.cpp
@@ -898,22 +898,20 @@ void StmtProfiler::VisitInitListExpr(const InitListExpr *S) {
 void StmtProfiler::VisitDesignatedInitExpr(const DesignatedInitExpr *S) {
   VisitExpr(S);
   ID.AddBoolean(S->usesGNUSyntax());
-  for (DesignatedInitExpr::const_designators_iterator D =
-         S->designators_begin(), DEnd = S->designators_end();
-       D != DEnd; ++D) {
-    if (D->isFieldDesignator()) {
+  for (const DesignatedInitExpr::Designator &D : S->designators()) {
+    if (D.isFieldDesignator()) {
       ID.AddInteger(0);
-      VisitName(D->getFieldName());
+      VisitName(D.getFieldName());
       continue;
     }
 
-    if (D->isArrayDesignator()) {
+    if (D.isArrayDesignator()) {
       ID.AddInteger(1);
     } else {
-      assert(D->isArrayRangeDesignator());
+      assert(D.isArrayRangeDesignator());
       ID.AddInteger(2);
     }
-    ID.AddInteger(D->getFirstExprIndex());
+    ID.AddInteger(D.getFirstExprIndex());
   }
 }
 
diff --git a/clang/lib/Index/IndexBody.cpp b/clang/lib/Index/IndexBody.cpp
index 74e082a7cae5..4908d852e896 100644
--- a/clang/lib/Index/IndexBody.cpp
+++ b/clang/lib/Index/IndexBody.cpp
@@ -147,13 +147,10 @@ public:
   }
 
   bool VisitDesignatedInitExpr(DesignatedInitExpr *E) {
-    for (DesignatedInitExpr::reverse_designators_iterator
-           D = E->designators_rbegin(), DEnd = E->designators_rend();
-           D != DEnd; ++D) {
-      if (D->isFieldDesignator())
-        return IndexCtx.handleReference(D->getField(), D->getFieldLoc(),
-                                        Parent, ParentDC, SymbolRoleSet(),
-                                        {}, E);
+    for (DesignatedInitExpr::Designator &D : llvm::reverse(E->designators())) {
+      if (D.isFieldDesignator())
+        return IndexCtx.handleReference(D.getField(), D.getFieldLoc(), Parent,
+                                        ParentDC, SymbolRoleSet(), {}, E);
     }
     return true;
   }
@@ -311,11 +308,9 @@ public:
       bool shouldWalkTypesOfTypeLocs() const { return false; }
 
       bool VisitDesignatedInitExpr(DesignatedInitExpr *E) {
-        for (DesignatedInitExpr::reverse_designators_iterator
-               D = E->designators_rbegin(), DEnd = E->designators_rend();
-               D != DEnd; ++D) {
-          if (D->isFieldDesignator())
-            return IndexCtx.handleReference(D->getField(), D->getFieldLoc(),
+        for (DesignatedInitExpr::Designator &D : llvm::reverse(E->designators())) {
+          if (D.isFieldDesignator())
+            return IndexCtx.handleReference(D.getField(), D.getFieldLoc(),
                                             Parent, ParentDC, SymbolRoleSet(),
                                             {}, E);
         }
diff --git a/clang/lib/Sema/ScopeInfo.cpp b/clang/lib/Sema/ScopeInfo.cpp
index 037ffd843bb7..4b2e13e20deb 100644
--- a/clang/lib/Sema/ScopeInfo.cpp
+++ b/clang/lib/Sema/ScopeInfo.cpp
@@ -215,7 +215,7 @@ void FunctionScopeInfo::markSafeWeakUse(const Expr *E) {
 
   // Has there been a read from the object using this Expr?
   FunctionScopeInfo::WeakUseVector::reverse_iterator ThisUse =
-    std::find(Uses->second.rbegin(), Uses->second.rend(), WeakUseTy(E, true));
+      llvm::find(llvm::reverse(Uses->second), WeakUseTy(E, true));
   if (ThisUse == Uses->second.rend())
     return;
 
diff --git a/clang/lib/Sema/SemaAttr.cpp b/clang/lib/Sema/SemaAttr.cpp
index 8933399340d7..0d7fba5c6709 100644
--- a/clang/lib/Sema/SemaAttr.cpp
+++ b/clang/lib/Sema/SemaAttr.cpp
@@ -222,8 +222,9 @@ void Sema::PragmaStack<ValueType>::Act(SourceLocation PragmaLocation,
   else if (Action & PSK_Pop) {
     if (!StackSlotLabel.empty()) {
       // If we've got a label, try to find it and jump there.
-      auto I = std::find_if(Stack.rbegin(), Stack.rend(),
-        [&](const Slot &x) { return x.StackSlotLabel == StackSlotLabel; });
+      auto I = llvm::find_if(llvm::reverse(Stack), [&](const Slot &x) {
+        return x.StackSlotLabel == StackSlotLabel;
+      });
       // If we found the label so pop from there.
       if (I != Stack.rend()) {
         CurrentValue = I->Value;
diff --git a/clang/lib/Sema/SemaCast.cpp b/clang/lib/Sema/SemaCast.cpp
index d27500d3f13b..e83dd0716780 100644
--- a/clang/lib/Sema/SemaCast.cpp
+++ b/clang/lib/Sema/SemaCast.cpp
@@ -1314,16 +1314,13 @@ TryStaticDowncast(Sema &Self, CanQualType SrcType, CanQualType DestType,
     }
     std::string PathDisplayStr;
     std::set<unsigned> DisplayedPaths;
-    for (CXXBasePaths::paths_iterator PI = Paths.begin(), PE = Paths.end();
-         PI != PE; ++PI) {
-      if (DisplayedPaths.insert(PI->back().SubobjectNumber).second) {
+    for (clang::CXXBasePath &Path : Paths) {
+      if (DisplayedPaths.insert(Path.back().SubobjectNumber).second) {
         // We haven't displayed a path to this particular base
         // class subobject yet.
         PathDisplayStr += "\n    ";
-        for (CXXBasePath::const_reverse_iterator EI = PI->rbegin(),
-                                                 EE = PI->rend();
-             EI != EE; ++EI)
-          PathDisplayStr += EI->Base->getType().getAsString() + " -> ";
+        for (CXXBasePathElement &PE : llvm::reverse(Path))
+          PathDisplayStr += PE.Base->getType().getAsString() + " -> ";
         PathDisplayStr += QualType(DestType).getAsString();
       }
     }
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 790ff4c09f5a..5761ece2fa8e 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -8770,12 +8770,11 @@ class SequenceChecker : public EvaluatedExprVisitor<SequenceChecker> {
       Self.ModAsSideEffect = &ModAsSideEffect;
     }
     ~SequencedSubexpression() {
-      for (auto MI = ModAsSideEffect.rbegin(), ME = ModAsSideEffect.rend();
-           MI != ME; ++MI) {
-        UsageInfo &U = Self.UsageMap[MI->first];
+      for (auto &M : llvm::reverse(ModAsSideEffect)) {
+        UsageInfo &U = Self.UsageMap[M.first];
         auto &SideEffectUsage = U.Uses[UK_ModAsSideEffect];
-        Self.addUsage(U, MI->first, SideEffectUsage.Use, UK_ModAsValue);
-        SideEffectUsage = MI->second;
+        Self.addUsage(U, M.first, SideEffectUsage.Use, UK_ModAsValue);
+        SideEffectUsage = M.second;
       }
       Self.ModAsSideEffect = OldModAsSideEffect;
     }
diff --git a/clang/lib/Sema/SemaInit.cpp b/clang/lib/Sema/SemaInit.cpp
index 2bd5217d215a..1d793e330cf5 100644
--- a/clang/lib/Sema/SemaInit.cpp
+++ b/clang/lib/Sema/SemaInit.cpp
@@ -1976,8 +1976,8 @@ static DesignatedInitExpr *CloneDesignatedInitExpr(Sema &SemaRef,
   SmallVector<Expr*, 4> IndexExprs(NumIndexExprs);
   for (unsigned I = 0; I < NumIndexExprs; ++I)
     IndexExprs[I] = DIE->getSubExpr(I + 1);
-  return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators_begin(),
-                                    DIE->size(), IndexExprs,
+  return DesignatedInitExpr::Create(SemaRef.Context, DIE->designators(),
+                                    IndexExprs,
                                     DIE->getEqualOrColonLoc(),
                                     DIE->usesGNUSyntax(), DIE->getInit());
 }
@@ -2837,7 +2837,7 @@ ExprResult Sema::ActOnDesignatedInitializer(Designation &Desig,
 
   DesignatedInitExpr *DIE
     = DesignatedInitExpr::Create(Context,
-                                 Designators.data(), Designators.size(),
+                                 Designators,
                                  InitExpressions, Loc, GNUSyntax,
                                  Init.getAs<Expr>());
 
diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index 37db9aec6372..9d0cf106ef78 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -4152,10 +4152,8 @@ TypoCorrectionConsumer::NamespaceSpecifierSet::NamespaceSpecifierSet(
   // Build the list of identifiers that would be used for an absolute
   // (from the global context) NestedNameSpecifier referring to the current
   // context.
-  for (DeclContextList::reverse_iterator C = CurContextChain.rbegin(),
-                                         CEnd = CurContextChain.rend();
-       C != CEnd; ++C) {
-    if (NamespaceDecl *ND = dyn_cast_or_null<NamespaceDecl>(*C))
+  for (DeclContext *C : llvm::reverse(CurContextChain)) {
+    if (auto *ND = dyn_cast_or_null<NamespaceDecl>(C))
       CurContextIdentifiers.push_back(ND->getIdentifier());
   }
 
@@ -4183,13 +4181,11 @@ unsigned
 TypoCorrectionConsumer::NamespaceSpecifierSet::buildNestedNameSpecifier(
     DeclContextList &DeclChain, NestedNameSpecifier *&NNS) {
   unsigned NumSpecifiers = 0;
-  for (DeclContextList::reverse_iterator C = DeclChain.rbegin(),
-                                      CEnd = DeclChain.rend();
-       C != CEnd; ++C) {
-    if (NamespaceDecl *ND = dyn_cast_or_null<NamespaceDecl>(*C)) {
+  for (DeclContext *C : llvm::reverse(DeclChain)) {
+    if (auto *ND = dyn_cast_or_null<NamespaceDecl>(C)) {
       NNS = NestedNameSpecifier::Create(Context, NNS, ND);
       ++NumSpecifiers;
-    } else if (RecordDecl *RD = dyn_cast_or_null<RecordDecl>(*C)) {
+    } else if (auto *RD = dyn_cast_or_null<RecordDecl>(C)) {
       NNS = NestedNameSpecifier::Create(Context, NNS, RD->isTemplateDecl(),
                                         RD->getTypeForDecl());
       ++NumSpecifiers;
@@ -4206,10 +4202,9 @@ void TypoCorrectionConsumer::NamespaceSpecifierSet::addNameSpecifier(
   DeclContextList FullNamespaceDeclChain(NamespaceDeclChain);
 
   // Eliminate common elements from the two DeclContext chains.
-  for (DeclContextList::reverse_iterator C = CurContextChain.rbegin(),
-                                      CEnd = CurContextChain.rend();
-       C != CEnd && !NamespaceDeclChain.empty() &&
-       NamespaceDeclChain.back() == *C; ++C) {
+  for (DeclContext *C : llvm::reverse(CurContextChain)) {
+    if (NamespaceDeclChain.empty() || NamespaceDeclChain.back() != C)
+      break;
     NamespaceDeclChain.pop_back();
   }
 
diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index bba90191019c..4bdd9e548a10 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -8780,46 +8780,44 @@ TreeTransform<Derived>::TransformDesignatedInitExpr(DesignatedInitExpr *E) {
   // transform the designators.
   SmallVector<Expr*, 4> ArrayExprs;
   bool ExprChanged = false;
-  for (DesignatedInitExpr::designators_iterator D = E->designators_begin(),
-                                             DEnd = E->designators_end();
-       D != DEnd; ++D) {
-    if (D->isFieldDesignator()) {
-      Desig.AddDesignator(Designator::getField(D->getFieldName(),
-                                               D->getDotLoc(),
-                                               D->getFieldLoc()));
+  for (const DesignatedInitExpr::Designator &D : E->designators()) {
+    if (D.isFieldDesignator()) {
+      Desig.AddDesignator(Designator::getField(D.getFieldName(),
+                                               D.getDotLoc(),
+                                               D.getFieldLoc()));
       continue;
     }
 
-    if (D->isArrayDesignator()) {
-      ExprResult Index = getDerived().TransformExpr(E->getArrayIndex(*D));
+    if (D.isArrayDesignator()) {
+      ExprResult Index = getDerived().TransformExpr(E->getArrayIndex(D));
       if (Index.isInvalid())
         return ExprError();
 
-      Desig.AddDesignator(Designator::getArray(Index.get(),
-                                               D->getLBracketLoc()));
+      Desig.AddDesignator(
+          Designator::getArray(Index.get(), D.getLBracketLoc()));
 
-      ExprChanged = ExprChanged || Init.get() != E->getArrayIndex(*D);
+      ExprChanged = ExprChanged || Init.get() != E->getArrayIndex(D);
       ArrayExprs.push_back(Index.get());
       continue;
     }
 
-    assert(D->isArrayRangeDesignator() && "New kind of designator?");
+    assert(D.isArrayRangeDesignator() && "New kind of designator?");
     ExprResult Start
-      = getDerived().TransformExpr(E->getArrayRangeStart(*D));
+      = getDerived().TransformExpr(E->getArrayRangeStart(D));
     if (Start.isInvalid())
       return ExprError();
 
-    ExprResult End = getDerived().TransformExpr(E->getArrayRangeEnd(*D));
+    ExprResult End = getDerived().TransformExpr(E->getArrayRangeEnd(D));
     if (End.isInvalid())
       return ExprError();
 
     Desig.AddDesignator(Designator::getArrayRange(Start.get(),
                                                   End.get(),
-                                                  D->getLBracketLoc(),
-                                                  D->getEllipsisLoc()));
+                                                  D.getLBracketLoc(),
+                                                  D.getEllipsisLoc()));
 
-    ExprChanged = ExprChanged || Start.get() != E->getArrayRangeStart(*D) ||
-      End.get() != E->getArrayRangeEnd(*D);
+    ExprChanged = ExprChanged || Start.get() != E->getArrayRangeStart(D) ||
+                  End.get() != E->getArrayRangeEnd(D);
 
     ArrayExprs.push_back(Start.get());
     ArrayExprs.push_back(End.get());
diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index 911ac478b818..cc6f34099626 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -749,31 +749,29 @@ void ASTStmtWriter::VisitDesignatedInitExpr(DesignatedInitExpr *E) {
     Record.AddStmt(E->getSubExpr(I));
   Record.AddSourceLocation(E->getEqualOrColonLoc());
   Record.push_back(E->usesGNUSyntax());
-  for (DesignatedInitExpr::designators_iterator D = E->designators_begin(),
-                                             DEnd = E->designators_end();
-       D != DEnd; ++D) {
-    if (D->isFieldDesignator()) {
-      if (FieldDecl *Field = D->getField()) {
+  for (const DesignatedInitExpr::Designator &D : E->designators()) {
+    if (D.isFieldDesignator()) {
+      if (FieldDecl *Field = D.getField()) {
         Record.push_back(serialization::DESIG_FIELD_DECL);
         Record.AddDeclRef(Field);
       } else {
         Record.push_back(serialization::DESIG_FIELD_NAME);
-        Record.AddIdentifierRef(D->getFieldName());
+        Record.AddIdentifierRef(D.getFieldName());
       }
-      Record.AddSourceLocation(D->getDotLoc());
-      Record.AddSourceLocation(D->getFieldLoc());
-    } else if (D->isArrayDesignator()) {
+      Record.AddSourceLocation(D.getDotLoc());
+      Record.AddSourceLocation(D.getFieldLoc());
+    } else if (D.isArrayDesignator()) {
       Record.push_back(serialization::DESIG_ARRAY);
-      Record.push_back(D->getFirstExprIndex());
-      Record.AddSourceLocation(D->getLBracketLoc());
-      Record.AddSourceLocation(D->getRBracketLoc());
+      Record.push_back(D.getFirstExprIndex());
+      Record.AddSourceLocation(D.getLBracketLoc());
+      Record.AddSourceLocation(D.getRBracketLoc());
     } else {
-      assert(D->isArrayRangeDesignator() && "Unknown designator");
+      assert(D.isArrayRangeDesignator() && "Unknown designator");
       Record.push_back(serialization::DESIG_ARRAY_RANGE);
-      Record.push_back(D->getFirstExprIndex());
-      Record.AddSourceLocation(D->getLBracketLoc());
-      Record.AddSourceLocation(D->getEllipsisLoc());
-      Record.AddSourceLocation(D->getRBracketLoc());
+      Record.push_back(D.getFirstExprIndex());
+      Record.AddSourceLocation(D.getLBracketLoc());
+      Record.AddSourceLocation(D.getEllipsisLoc());
+      Record.AddSourceLocation(D.getRBracketLoc());
     }
   }
   Code = serialization::EXPR_DESIGNATED_INIT;
diff --git a/clang/lib/Serialization/ModuleManager.cpp b/clang/lib/Serialization/ModuleManager.cpp
index 74f75a103f7a..292f36dfeb2a 100644
--- a/clang/lib/Serialization/ModuleManager.cpp
+++ b/clang/lib/Serialization/ModuleManager.cpp
@@ -320,11 +320,11 @@ void ModuleManager::visit(llvm::function_ref<bool(ModuleFile &M)> Visitor,
     Queue.reserve(N);
     llvm::SmallVector<unsigned, 4> UnusedIncomingEdges;
     UnusedIncomingEdges.resize(size());
-    for (auto M = rbegin(), MEnd = rend(); M != MEnd; ++M) {
-      unsigned Size = (*M)->ImportedBy.size();
-      UnusedIncomingEdges[(*M)->Index] = Size;
+    for (ModuleFile *M : llvm::reverse(*this)) {
+      unsigned Size = M->ImportedBy.size();
+      UnusedIncomingEdges[M->Index] = Size;
       if (!Size)
-        Queue.push_back(*M);
+        Queue.push_back(M);
     }
 
     // Traverse the graph, making sure to visit a module before visiting any
diff --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index 4a1badb68d52..dc95b599a70e 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -2400,21 +2400,20 @@ void EnqueueVisitor::VisitDeclStmt(const DeclStmt *S) {
 }
 void EnqueueVisitor::VisitDesignatedInitExpr(const DesignatedInitExpr *E) {
   AddStmt(E->getInit());
-  for (DesignatedInitExpr::const_reverse_designators_iterator
-         D = E->designators_rbegin(), DEnd = E->designators_rend();
-         D != DEnd; ++D) {
-    if (D->isFieldDesignator()) {
-      if (FieldDecl *Field = D->getField())
-        AddMemberRef(Field, D->getFieldLoc());
+  for (const DesignatedInitExpr::Designator &D :
+       llvm::reverse(E->designators())) {
+    if (D.isFieldDesignator()) {
+      if (FieldDecl *Field = D.getField())
+        AddMemberRef(Field, D.getFieldLoc());
       continue;
     }
-    if (D->isArrayDesignator()) {
-      AddStmt(E->getArrayIndex(*D));
+    if (D.isArrayDesignator()) {
+      AddStmt(E->getArrayIndex(D));
       continue;
     }
-    assert(D->isArrayRangeDesignator() && "Unknown designator kind");
-    AddStmt(E->getArrayRangeEnd(*D));
-    AddStmt(E->getArrayRangeStart(*D));
+    assert(D.isArrayRangeDesignator() && "Unknown designator kind");
+    AddStmt(E->getArrayRangeEnd(D));
+    AddStmt(E->getArrayRangeStart(D));
   }
 }
 void EnqueueVisitor::VisitExplicitCastExpr(const ExplicitCastExpr *E) {
diff --git a/clang/utils/TableGen/ClangAttrEmitter.cpp b/clang/utils/TableGen/ClangAttrEmitter.cpp
index b6d1e24b907f..1186d16ba272 100644
--- a/clang/utils/TableGen/ClangAttrEmitter.cpp
+++ b/clang/utils/TableGen/ClangAttrEmitter.cpp
@@ -1212,7 +1212,7 @@ createArgument(const Record &Arg, StringRef Attr,
   if (!Ptr) {
     // Search in reverse order so that the most-derived type is handled first.
     ArrayRef<std::pair<Record*, SMRange>> Bases = Search->getSuperClasses();
-    for (const auto &Base : llvm::make_range(Bases.rbegin(), Bases.rend())) {
+    for (const auto &Base : llvm::reverse(Bases)) {
       if ((Ptr = createArgument(Arg, Attr, Base.first)))
         break;
     }
@@ -1630,7 +1630,7 @@ void EmitClangAttrClass(RecordKeeper &Records, raw_ostream &OS) {
     ArrayRef<std::pair<Record *, SMRange>> Supers = R.getSuperClasses();
     assert(!Supers.empty() && "Forgot to specify a superclass for the attr");
     std::string SuperName;
-    for (const auto &Super : llvm::make_range(Supers.rbegin(), Supers.rend())) {
+    for (const auto &Super : llvm::reverse(Supers)) {
       const Record *R = Super.first;
       if (R->getName() != "TargetSpecificAttr" && SuperName.empty())
         SuperName = R->getName();