[index] The references to member enums from template instantiations should

refer to the pattern member enum in the base template

rdar://32325459


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@303650 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Index/IndexingContext.cpp

@@ -127,6 +127,9 @@ bool IndexingContext::isTemplateImplicitInstantiation(const Decl *D) {
   } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
     if (RD->getInstantiatedFromMemberClass())
       TKind = RD->getTemplateSpecializationKind();
+  } else if (const auto *ED = dyn_cast<EnumDecl>(D)) {
+    if (ED->getInstantiatedFromMemberEnum())
+      TKind = ED->getTemplateSpecializationKind();
   } else if (isa<FieldDecl>(D) || isa<TypedefNameDecl>(D)) {
     if (const auto *Parent = dyn_cast<Decl>(D->getDeclContext()))
       return isTemplateImplicitInstantiation(Parent);
@@ -177,6 +180,8 @@ static const Decl *adjustTemplateImplicitInstantiation(const Decl *D) {
     return VD->getTemplateInstantiationPattern();
   } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
     return RD->getInstantiatedFromMemberClass();
+  } else if (const auto *ED = dyn_cast<EnumDecl>(D)) {
+    return ED->getInstantiatedFromMemberEnum();
   } else if (isa<FieldDecl>(D) || isa<TypedefNameDecl>(D)) {
     const auto *ND = cast<NamedDecl>(D);
     if (const CXXRecordDecl *Pattern =

test/Index/Core/index-instantiated-source.cpp

@@ -42,6 +42,11 @@ public:
 
     typedef int Typedef;
 // CHECK: [[@LINE-1]]:17 | type-alias/C | Typedef | c:{{.*}}index-instantiated-source.cpp@ST>2#T#T@TemplateClass@S@NestedType@T@Typedef |
+
+    enum Enum {
+// CHECK: [[@LINE-1]]:10 | enum/C | Enum | c:@ST>2#T#T@TemplateClass@S@NestedType@E@Enum |
+      EnumCase
+    };
   };
 };
 
@@ -74,4 +79,7 @@ void canonicalizeInstaniationReferences(TemplateClass<int, float> &object) {
 // CHECK: [[@LINE-1]]:19 | type-alias/C++ | TypeAlias | c:@ST>2#T#T@TemplateClass@S@NestedType@TypeAlias |
   TT::NestedType::Typedef nestedTypedef;
 // CHECK: [[@LINE-1]]:19 | type-alias/C | Typedef | c:{{.*}}index-instantiated-source.cpp@ST>2#T#T@TemplateClass@S@NestedType@T@Typedef |
+
+  TT::NestedType::Enum nestedEnum;
+// CHECK: [[@LINE-1]]:19 | enum/C | Enum | c:@ST>2#T#T@TemplateClass@S@NestedType@E@Enum |
 }