r344259 - Improve -Wshadow warnings with enumerators.

[Aaron Ballman via cfe-commits]

Author: aaronballman
Date: Thu Oct 11 09:40:18 2018
New Revision: 344259

URL: http://llvm.org/viewvc/llvm-project?rev=344259&view=rev
Log:
Improve -Wshadow warnings with enumerators.

Addresses PR24718 by checking for enumerators that shadow other enumerators. Catches issues like:

enum E1{e1};
void f(void) {
  enum E2{e1};
}

Modified:
    cfe/trunk/lib/Sema/SemaDecl.cpp
    cfe/trunk/test/Sema/warn-shadow.c
    cfe/trunk/test/SemaCXX/warn-shadow.cpp

Modified: cfe/trunk/lib/Sema/SemaDecl.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaDecl.cpp?rev=344259&r1=344258&r2=344259&view=diff
==============================================================================
--- cfe/trunk/lib/Sema/SemaDecl.cpp (original)
+++ cfe/trunk/lib/Sema/SemaDecl.cpp Thu Oct 11 09:40:18 2018
@@ -16269,8 +16269,10 @@ Decl *Sema::ActOnEnumConstant(Scope *S,
 
   // Verify that there isn't already something declared with this name in this
   // scope.
-  NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName,
-                                         ForVisibleRedeclaration);
+  LookupResult R(*this, Id, IdLoc, LookupOrdinaryName, ForVisibleRedeclaration);
+  LookupName(R, S);
+  NamedDecl *PrevDecl = R.getAsSingle<NamedDecl>();
+
   if (PrevDecl && PrevDecl->isTemplateParameter()) {
     // Maybe we will complain about the shadowed template parameter.
     DiagnoseTemplateParameterShadow(IdLoc, PrevDecl);
@@ -16293,6 +16295,11 @@ Decl *Sema::ActOnEnumConstant(Scope *S,
     return nullptr;
 
   if (PrevDecl) {
+    if (!TheEnumDecl->isScoped()) {
+      // Check for other kinds of shadowing not already handled.
+      CheckShadow(New, PrevDecl, R);
+    }
+
     // When in C++, we may get a TagDecl with the same name; in this case the
     // enum constant will 'hide' the tag.
     assert((getLangOpts().CPlusPlus || !isa<TagDecl>(PrevDecl)) &&

Modified: cfe/trunk/test/Sema/warn-shadow.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/warn-shadow.c?rev=344259&r1=344258&r2=344259&view=diff
==============================================================================
--- cfe/trunk/test/Sema/warn-shadow.c (original)
+++ cfe/trunk/test/Sema/warn-shadow.c Thu Oct 11 09:40:18 2018
@@ -59,3 +59,8 @@ void rdar8883302() {
 void test8() {
   int bob; // expected-warning {{declaration shadows a variable in the global scope}}
 }
+
+enum PR24718_1{pr24718}; // expected-note {{previous declaration is here}}
+void PR24718(void) {
+  enum PR24718_2{pr24718}; // expected-warning {{declaration shadows a variable in the global scope}}
+}

Modified: cfe/trunk/test/SemaCXX/warn-shadow.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/SemaCXX/warn-shadow.cpp?rev=344259&r1=344258&r2=344259&view=diff
==============================================================================
--- cfe/trunk/test/SemaCXX/warn-shadow.cpp (original)
+++ cfe/trunk/test/SemaCXX/warn-shadow.cpp Thu Oct 11 09:40:18 2018
@@ -222,3 +222,6 @@ void f(int a) {
   };
 }
 }
+
+int PR24718;
+enum class X { PR24718 }; // Ok, not shadowing