[PATCH] D80295: [Sema] Diagnose static data members in classes nested in unnamed classes

[John Brawn via Phabricator via cfe-commits]

john.brawn updated this revision to Diff 265279.
john.brawn added a comment.

Adjusted to not give multiple errors when more than one error criteria is met.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80295/new/

https://reviews.llvm.org/D80295

Files:
  clang/lib/Sema/SemaDecl.cpp
  clang/test/SemaCXX/anonymous-struct.cpp


Index: clang/test/SemaCXX/anonymous-struct.cpp
===================================================================
--- clang/test/SemaCXX/anonymous-struct.cpp
+++ clang/test/SemaCXX/anonymous-struct.cpp
@@ -153,3 +153,21 @@
   const Empty E;
 } C;
 } // namespace ImplicitDecls
+
+struct {
+  static int x; // expected-error {{static data member 'x' not allowed in anonymous struct}}
+} static_member_1;
+
+struct {
+  struct A {
+    static int x; // expected-error {{static data member 'x' not allowed in anonymous struct}}
+  } x;
+} static_member_2;
+
+struct {
+  struct A {
+    struct B {
+      static int x; // expected-error {{static data member 'x' not allowed in anonymous struct}}
+    } x;
+  } x;
+} static_member_3;
Index: clang/lib/Sema/SemaDecl.cpp
===================================================================
--- clang/lib/Sema/SemaDecl.cpp
+++ clang/lib/Sema/SemaDecl.cpp
@@ -6885,19 +6885,29 @@
 
     if (SC == SC_Static && CurContext->isRecord()) {
       if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) {
-        // C++ [class.static.data]p2:
-        //   A static data member shall not be a direct member of an unnamed
-        //   or local class
-        // FIXME: or of a (possibly indirectly) nested class thereof.
-        if (RD->isLocalClass()) {
-          Diag(D.getIdentifierLoc(),
-               diag::err_static_data_member_not_allowed_in_local_class)
-            << Name << RD->getDeclName() << RD->getTagKind();
-        } else if (!RD->getDeclName()) {
+        bool InAnonStruct = false;
+        for (DeclContext *Ctxt = DC;
+             const CXXRecordDecl *ParentDecl = dyn_cast<CXXRecordDecl>(Ctxt);
+             Ctxt = Ctxt->getParent()) {
+          if (!ParentDecl->getDeclName()) {
+            InAnonStruct = true;
+            break;
+          }
+        }
+        if (InAnonStruct) {
+          // C++ [class.static.data]p4: Unnamed classes and classes contained
+          // directly or indirectly within unnamed classes shall not contain
+          // static data members.
           Diag(D.getIdentifierLoc(),
                diag::err_static_data_member_not_allowed_in_anon_struct)
             << Name << RD->getTagKind();
           Invalid = true;
+        } else if (RD->isLocalClass()) {
+          // C++ [class.static.data]p5: A local class shall not have static data
+          // members.
+          Diag(D.getIdentifierLoc(),
+               diag::err_static_data_member_not_allowed_in_local_class)
+            << Name << RD->getDeclName() << RD->getTagKind();
         } else if (RD->isUnion()) {
           // C++98 [class.union]p1: If a union contains a static data member,
           // the program is ill-formed. C++11 drops this restriction.


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