cp-tree.h (TYPE_PTRMEM_CLASS_TYPE): Improve documentation.

	* cp-tree.h (TYPE_PTRMEM_CLASS_TYPE): Improve documentation.
	* mangle.c (write_pointer_to_member_type): Fix mangling of
	pointers to cv-qualified member function types.

From-SVN: r41373

gcc/cp/ChangeLog

 2001-04-15  Mark Mitchell  <mark@codesourcery.com>
 
+	* cp-tree.h (TYPE_PTRMEM_CLASS_TYPE): Improve documentation.
+	* mangle.c (write_pointer_to_member_type): Fix mangling of
+	pointers to cv-qualified member function types.
+
 	* init.c (build_delete): Create a SAVE_EXPR for the address if
 	we're going to use it more than once.
 

gcc/cp/cp-tree.h

@@ -2691,7 +2691,11 @@ extern int flag_new_for_scope;
 /* Returns the pfn field from a TYPE_PTRMEMFUNC_P.  */
 #define PFN_FROM_PTRMEMFUNC(NODE) pfn_from_ptrmemfunc ((NODE))
 
-/* For a pointer-to-member type of the form `T X::*', this is `X'.  */
+/* For a pointer-to-member type of the form `T X::*', this is `X'.
+   For a type like `void (X::*)() const', this type is `X', not `const
+   X'.  To get at the `const X' you have to look at the
+   TYPE_PTRMEM_POINTED_TO_TYPE; there, the first parameter will have
+   type `const X*'.  */
 #define TYPE_PTRMEM_CLASS_TYPE(NODE)			\
   (TYPE_PTRMEM_P ((NODE))				\
    ? TYPE_OFFSET_BASETYPE (TREE_TYPE ((NODE)))		\

gcc/cp/mangle.c

@@ -1928,7 +1928,24 @@ write_pointer_to_member_type (type)
      tree type;
 {
   write_char ('M');
-  write_type (TYPE_PTRMEM_CLASS_TYPE (type));
+  /* For a pointer-to-function member, the class type may be
+     cv-qualified, bug that won't be reflected in
+     TYPE_PTRMEM_CLASS_TYPE.  So, we go fishing around in
+     TYPE_PTRMEM_POINTED_TO_TYPE instead.  */
+  if (TYPE_PTRMEMFUNC_P (type))
+    {
+      tree fn_type;
+      tree this_type;
+
+      fn_type = TYPE_PTRMEM_POINTED_TO_TYPE (type);
+      /* The first parameter must be a POINTER_TYPE pointing to the
+	 `this' parameter.  */
+      this_type = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (fn_type)));
+      write_type (this_type);
+    }
+  /* For a pointer-to-data member, things are simpler.  */
+  else
+    write_type (TYPE_PTRMEM_CLASS_TYPE (type));
   write_type (TYPE_PTRMEM_POINTED_TO_TYPE (type));
 }
 

gcc/testsuite/g++.old-deja/g++.abi/mangle1.C

+// Build don't link:
+// Origin: Mark Mitchell <mark@codesourcery.com>
+
+struct S {};
+
+void f (void (S::*)()) {}
+void f (void (S::*)() const) {}