Re: [PATCH] C++0x, fixes for override/final

[Ville Voutilainen]

At Tue, 10 May 2011 00:46:54 -0400,
Jason Merrill wrote:
> This is breaking an optimization: before this change we don't bother 
> looking for overrides if we've never seen a virtual function with the 
> same name.  Just set overrides_found as well as DECL_VINDEX.

Ok. Tests still pass.

diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index 12db2bc..ba4378b 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -2453,6 +2453,7 @@ get_basefndecls (tree name, tree t)
 void
 check_for_override (tree decl, tree ctype)
 {
+  int overrides_found = 0;
   if (TREE_CODE (decl) == TEMPLATE_DECL)
     /* In [temp.mem] we have:
 
@@ -2467,7 +2468,10 @@ check_for_override (tree decl, tree ctype)
     /* Set DECL_VINDEX to a value that is neither an INTEGER_CST nor
        the error_mark_node so that we know it is an overriding
        function.  */
-    DECL_VINDEX (decl) = decl;
+    {
+      DECL_VINDEX (decl) = decl;
+      overrides_found = 1;
+    }
 
   if (DECL_VIRTUAL_P (decl))
     {
@@ -2477,11 +2481,11 @@ check_for_override (tree decl, tree ctype)
       if (DECL_DESTRUCTOR_P (decl))
        TYPE_HAS_NONTRIVIAL_DESTRUCTOR (ctype) = true;
     }
-  else if (DECL_OVERRIDE_P (decl))
-    {
-      DECL_VINDEX (decl) = error_mark_node;
-      error ("%q+#D marked override, but does not override", decl);
-    }
+  else if (DECL_FINAL_P (decl))
+        error ("%q+#D marked final, but is not virtual", decl);
+  if (DECL_OVERRIDE_P (decl)
+      && !overrides_found)
+    error ("%q+#D marked override, but does not override", decl);
 }
 
 /* Warn about hidden virtual functions that are not overridden in t.
diff --git a/gcc/testsuite/g++.dg/inherit/virtual9.C 
b/gcc/testsuite/g++.dg/inherit/virtual9.C
index d3175e1..83e0479 100644
--- a/gcc/testsuite/g++.dg/inherit/virtual9.C
+++ b/gcc/testsuite/g++.dg/inherit/virtual9.C
@@ -3,6 +3,7 @@ struct B
 {
   virtual void f() final {}
   virtual void g() {}
+  virtual void x() const {}
 };
 
 struct B2
@@ -20,7 +21,12 @@ template <class T> struct D2 : T
   void h() override {} // { dg-error "marked override, but does not override" }
 };
 
-struct D3 : D
+template <class T> struct D3 : T
+{
+  void h() override {}
+};
+
+struct D4 : D
 {
   void g() {} // { dg-error "virtual function" }
 };
@@ -30,10 +36,25 @@ struct B3
   virtual void f() final final {} // { dg-error "duplicate virt-specifier" }
 };
 
-void g() override {} // { dg-error "virt-specifiers" }
+struct B4
+{
+  void f() final {} // { dg-error "marked final, but is not virtual" }
+};
+
+struct D5 : B
+{
+  void ff() override {} // { dg-error "marked override, but does not override" 
}
+  virtual void fff() override {} // { dg-error "marked override, but does not 
override" }
+  virtual void x() override {} // { dg-error "marked override, but does not 
override" }
+  void g() override;
+};
+
+void D5::g() override {} // { dg-error "not allowed outside a class 
definition" }
+void g() override {} // { dg-error "not allowed outside a class definition" }
 
 int main()
 {
-  D2<B> d2;
-  D2<B2> d3;
+  D2<B> d;
+  D2<B2> d2;
+  D3<B2> d3;
 }