re PR c++/53186 ([C++11] missing devirtualization for operators "final")

/cp
2012-05-03  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53186
	* call.c (build_over_call): Handle final member functions
	and class types.
	(build_new_method_call_1): Do not handle here.

/testsuite
2012-05-03  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/53186
	* g++.dg/other/final2.C: New.

From-SVN: r187097

gcc/cp/ChangeLog

+2012-05-03  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/53186
+	* call.c (build_over_call): Handle final member functions
+	and class types.
+	(build_new_method_call_1): Do not handle here.
+
 2012-05-02  Richard Guenther  <rguenther@suse.de>
 
 	* decl.c (grokdeclarator): Properly check for sizes that

gcc/cp/call.c

@@ -6550,6 +6550,12 @@ build_over_call (struct z_candidate *cand, int flags, tsubst_flags_t complain)
 	    return error_mark_node;
 	}
 
+      /* See if the function member or the whole class type is declared
+	 final and the call can be devirtualized.  */
+      if (DECL_FINAL_P (fn)
+	  || CLASSTYPE_FINAL (TYPE_METHOD_BASETYPE (TREE_TYPE (fn))))
+	flags |= LOOKUP_NONVIRTUAL;
+
       /* [class.mfct.nonstatic]: If a nonstatic member function of a class
 	 X is called for an object that is not of type X, or of a type
 	 derived from X, the behavior is undefined.
@@ -7418,8 +7424,7 @@ build_new_method_call_1 (tree instance, tree fns, VEC(tree,gc) **args,
 	      /* Optimize away vtable lookup if we know that this function
 		 can't be overridden.  */
 	      if (DECL_VINDEX (fn) && ! (flags & LOOKUP_NONVIRTUAL)
-		  && (resolves_to_fixed_type_p (instance, 0)
-		      || DECL_FINAL_P (fn) || CLASSTYPE_FINAL (basetype)))
+		  && resolves_to_fixed_type_p (instance, 0))
 		flags |= LOOKUP_NONVIRTUAL;
               if (explicit_targs)
                 flags |= LOOKUP_EXPLICIT_TMPL_ARGS;

gcc/testsuite/ChangeLog

+2012-05-03  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/53186
+	* g++.dg/other/final2.C: New.
+
 2012-05-03  Richard Guenther  <rguenther@suse.de>
 
 	* gcc.dg/tree-ssa/ssa-pre-27.c: Remove XFAIL.

gcc/testsuite/g++.dg/other/final2.C

+// PR c++/53186
+// { dg-options "-fdump-tree-original -std=c++11"  }
+
+struct F1
+{
+  virtual void operator()() final;
+  virtual operator int() final;
+  virtual int operator++() final;
+};
+
+struct F2 final
+{
+  virtual void operator()();
+  virtual operator int();
+  virtual int operator++();
+};
+
+void fooF1(F1& a) { a(); int m = a; ++a; }
+void fooF2(F2& a) { a(); int m = a; ++a; }
+
+// { dg-final { scan-tree-dump-times "F1::operator\\(\\)" 1 "original" } }
+// { dg-final { scan-tree-dump-times "F1::operator int" 1 "original" } }
+// { dg-final { scan-tree-dump-times "F1::operator\\+\\+" 1 "original" } }
+// { dg-final { scan-tree-dump-times "F2::operator\\(\\)" 1 "original" } }
+// { dg-final { scan-tree-dump-times "F2::operator int" 1 "original" } }
+// { dg-final { scan-tree-dump-times "F2::operator\\+\\+" 1 "original" } }
+// { dg-final { cleanup-tree-dump "original" } }