Re: enable-build-with-cxx bootstrap compare broken by r149964

[Jerry Quinn <jlquinn at optonline dot net>]

On Mon, 2009-10-26 at 09:53 -0400, Jason Merrill wrote:
> On 10/26/2009 07:14 AM, Jakub Jelinek wrote:
> >> -/* Generate the mangled representation of TYPE for the typeinfo name.
> >> */
> >> +/* Generate the mangled representation of TYPE.  */
> >>
> >>   const char *
> >> -mangle_type_string_for_rtti (const tree type)
> >> +mangle_type_string (const tree type)
> >
> > Why this change?
> 
> This change is part of reverting my earlier fake namespace patch.
> 
> I agree with Jakub's other comments, though.
> 
> Jason

Here's the updated patch.


2009-10-28  Jerry Quinn  <jlquinn@optonline.net>

	* mangle.c (mangle_type_string_for_rtti): Revert r149964.
	(needs_fake_anon): Likewise.
	(write_name): Likewise.
	(write_nested_name): Likewise.
	* cp-tree.h (mangle_type_string_for_rtti): Likewise.
	(get_anonymous_namespace): Likewise.
	* name-lookup.c (get_anonymous_namespace_name): Likewise.
	* rtti.c (tinfo_name): Insert '*' in front of private names.
	(tinfo_base_init): Use it.

2009-10-28  Jerry Quinn  <jlquinn@optonline.net>

	* libsupc++/tinfo.cc (operator=(const type_info&)): Compare by
	pointer if name begins with '*'.
	* libsupc++/typeinfo (type_info::name()): Likewise.
	* libsupc++/tinfo2.cc (before):  Likewise.

Index: gcc/cp/rtti.c
===================================================================
--- gcc/cp/rtti.c	(revision 153489)
+++ gcc/cp/rtti.c	(working copy)
@@ -102,7 +102,7 @@
 static GTY (()) VEC(tinfo_s,gc) *tinfo_descs;
 
 static tree ifnonnull (tree, tree);
-static tree tinfo_name (tree);
+static tree tinfo_name (tree, bool);
 static tree build_dynamic_cast_1 (tree, tree, tsubst_flags_t);
 static tree throw_bad_cast (void);
 static tree throw_bad_typeid (void);
@@ -349,16 +349,30 @@
   return exp;
 }
 
-/* Generate the NTBS name of a type.  */
+/* Generate the NTBS name of a type.  If MARK_PRIVATE, put a '*' in
front so that
+   comparisons will be done by pointer rather than string comparison.
*/
 static tree
-tinfo_name (tree type)
+tinfo_name (tree type, bool mark_private)
 {
   const char *name;
+  int length;
   tree name_string;
 
-  name = mangle_type_string_for_rtti (type);
-  name_string = fix_string_type (build_string (strlen (name) + 1,
name));
-  return name_string;
+  name = mangle_type_string (type);
+  length = strlen (name);
+
+  if (mark_private)
+    {
+      /* Inject '*' at beginning of name to force pointer comparison.
*/
+      char* buf = (char*) XALLOCAVEC (char, length + 1);
+      buf[0] = '*';
+      memcpy (buf + 1, name, length);
+      name_string = build_string (length + 1, buf);
+    }
+  else
+    name_string = build_string (length + 1, name);
+
+  return fix_string_type (name_string);
 }
 
 /* Return a VAR_DECL for the internal ABI defined type_info object for
@@ -839,13 +853,12 @@
   tree vtable_ptr;
 
   {
-    tree name_name;
+    tree name_name, name_string;
 
     /* Generate the NTBS array variable.  */
     tree name_type = build_cplus_array_type
 		     (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
 		     NULL_TREE);
-    tree name_string = tinfo_name (target);
 
     /* Determine the name of the variable -- and remember with which
        type it is associated.  */
@@ -862,6 +875,7 @@
     DECL_TINFO_P (name_decl) = 1;
     set_linkage_according_to_type (target, name_decl);
     import_export_decl (name_decl);
+    name_string = tinfo_name (target, !TREE_PUBLIC (name_decl));
     DECL_INITIAL (name_decl) = name_string;
     mark_used (name_decl);
     pushdecl_top_level_and_finish (name_decl, name_string);
Index: gcc/cp/ChangeLog
===================================================================
--- gcc/cp/ChangeLog	(revision 153489)
+++ gcc/cp/ChangeLog	(working copy)
@@ -1,3 +1,15 @@
+2009-10-28  Jerry Quinn  <jlquinn@optonline.net>
+
+	* mangle.c (mangle_type_string_for_rtti): Revert r149964.
+	(needs_fake_anon): Likewise.
+	(write_name): Likewise.
+	(write_nested_name): Likewise.
+	* cp-tree.h (mangle_type_string_for_rtti): Likewise.
+	(get_anonymous_namespace): Likewise.
+	* name-lookup.c (get_anonymous_namespace_name): Likewise.
+	* rtti.c (tinfo_name): Insert '*' in front of private names.
+	(tinfo_base_init): Use it.
+
 2009-10-21  Jakub Jelinek  <jakub@redhat.com>
 
 	* mangle.c (finish_mangling_get_identifier): Use
Index: gcc/cp/mangle.c
===================================================================
--- gcc/cp/mangle.c	(revision 153489)
+++ gcc/cp/mangle.c	(working copy)
@@ -105,10 +105,6 @@
 
 static GTY (()) globals G;
 
-/* Whether or not to pretend that a static function is in an anonymous
-   namespace.  */
-static bool fake_anon_scope;
-
 /* The obstack on which we build mangled names.  */
 static struct obstack *mangle_obstack;
 
@@ -734,20 +730,6 @@
     }
 }
 
-/* Since we now use strcmp to compare typeinfos on all targets because
of
-   the RTLD_LOCAL problem, we need to munge the typeinfo name used for
-   local classes of static functions to fix g++.dg/abi/local1.C.  We do
-   that by pretending that the function is in an anonymous namespace.
*/
-
-static bool
-needs_fake_anon (const_tree decl)
-{
-  /* Pretend there's an anonymous namespace right around a static
-     function if we're mangling for RTTI.  */
-  return (fake_anon_scope && !TREE_PUBLIC (decl)
-	  && TREE_CODE (decl) == FUNCTION_DECL);
-}
-
 /* Lambdas can have a bit more context for mangling, specifically
VAR_DECL
    or PARM_DECL context, which doesn't belong in DECL_CONTEXT.  */
 
@@ -791,18 +773,13 @@
 
   context = decl_mangling_context (decl);
 
-  gcc_assert (context != NULL_TREE);
-
-  /* If we need a fake anonymous namespace, force the nested name path.
*/
-  if (needs_fake_anon (decl) && context == global_namespace)
-    context = error_mark_node;
-
   /* A decl in :: or ::std scope is treated specially.  The former is
      mangled using <unscoped-name> or <unscoped-template-name>, the
      latter with a special substitution.  Also, a name that is
      directly in a local function scope is also mangled with
      <unscoped-name> rather than a full <nested-name>.  */
-  if (context == global_namespace
+  if (context == NULL
+      || context == global_namespace
       || DECL_NAMESPACE_STD_P (context)
       || (ignore_local_scope && TREE_CODE (context) == FUNCTION_DECL))
     {
@@ -820,9 +797,6 @@
     }
   else
     {
-      if (context == error_mark_node)
-	context = global_namespace;
-
       /* Handle local names, unless we asked not to (that is, invoked
 	 under <local-name>, to handle only the part of the name under
 	 the local scope).  */
@@ -835,10 +809,10 @@
 	     directly in that function's scope, either decl or one of
 	     its enclosing scopes.  */
 	  tree local_entity = decl;
-	  while (context != global_namespace)
+	  while (context != NULL && context != global_namespace)
 	    {
 	      /* Make sure we're always dealing with decls.  */
-	      if (TYPE_P (context))
+	      if (context != NULL && TYPE_P (context))
 		context = TYPE_NAME (context);
 	      /* Is this a function?  */
 	      if (TREE_CODE (context) == FUNCTION_DECL
@@ -883,6 +857,7 @@
       /* If not, it should be either in the global namespace, or
directly
 	 in a local function scope.  */
       gcc_assert (context == global_namespace
+		  || context != NULL
 		  || TREE_CODE (context) == FUNCTION_DECL);
 
       write_unqualified_name (decl);
@@ -954,9 +929,6 @@
     {
       /* No, just use <prefix>  */
       write_prefix (DECL_CONTEXT (decl));
-      if (needs_fake_anon (decl))
-	/* Pretend this static function is in an anonymous namespace.  */
-	write_source_name (get_anonymous_namespace_name ());
       write_unqualified_name (decl);
     }
   write_char ('E');
@@ -3011,18 +2983,15 @@
   SET_DECL_ASSEMBLER_NAME (decl, id);
 }
 
-/* Generate the mangled representation of TYPE for the typeinfo name.
*/
+/* Generate the mangled representation of TYPE.  */
 
 const char *
-mangle_type_string_for_rtti (const tree type)
+mangle_type_string (const tree type)
 {
   const char *result;
 
   start_mangling (type);
-  /* Mangle in a fake anonymous namespace if necessary.  */
-  fake_anon_scope = true;
   write_type (type);
-  fake_anon_scope = false;
   result = finish_mangling (/*warn=*/false);
   if (DEBUG_MANGLE)
     fprintf (stderr, "mangle_type_string = '%s'\n\n", result);
Index: gcc/cp/cp-tree.h
===================================================================
--- gcc/cp/cp-tree.h	(revision 153489)
+++ gcc/cp/cp-tree.h	(working copy)
@@ -4507,7 +4507,6 @@
 extern tree perform_qualification_conversions	(tree, tree);
 
 /* in name-lookup.c */
-extern tree get_anonymous_namespace_name	(void);
 extern tree pushdecl				(tree);
 extern tree pushdecl_maybe_friend		(tree, bool);
 extern void maybe_push_cleanup_level		(tree);
@@ -5288,7 +5287,7 @@
 /* in mangle.c */
 extern void init_mangle				(void);
 extern void mangle_decl				(tree);
-extern const char *mangle_type_string_for_rtti	(tree);
+extern const char *mangle_type_string		(tree);
 extern tree mangle_typeinfo_for_type		(tree);
 extern tree mangle_typeinfo_string_for_type	(tree);
 extern tree mangle_vtbl_for_type		(tree);
Index: gcc/cp/name-lookup.c
===================================================================
--- gcc/cp/name-lookup.c	(revision 153489)
+++ gcc/cp/name-lookup.c	(working copy)
@@ -62,14 +62,19 @@
 
 /* Initialize anonymous_namespace_name if necessary, and return it.  */
 
-tree
+static tree
 get_anonymous_namespace_name (void)
 {
   if (!anonymous_namespace_name)
     {
       /* The anonymous namespace has to have a unique name
 	 if typeinfo objects are being compared by name.  */
-      anonymous_namespace_name = get_file_function_name ("N");
+      if (! flag_weak || ! SUPPORTS_ONE_ONLY)
+       anonymous_namespace_name = get_file_function_name ("N");
+      else
+       /* The demangler expects anonymous namespaces to be called
+          something starting with '_GLOBAL__N_'.  */
+       anonymous_namespace_name = get_identifier ("_GLOBAL__N_1");
     }
   return anonymous_namespace_name;
 }
Index: libstdc++-v3/libsupc++/tinfo2.cc
===================================================================
--- libstdc++-v3/libsupc++/tinfo2.cc	(revision 153489)
+++ libstdc++-v3/libsupc++/tinfo2.cc	(working copy)
@@ -37,7 +37,8 @@
 #if __GXX_MERGED_TYPEINFO_NAMES
   return name () < arg.name ();
 #else
-  return __builtin_strcmp (name (), arg.name ()) < 0;
+  return (name ()[0] == '*') ? name () < arg.name ()
+    :  __builtin_strcmp (name (), arg.name ()) < 0;
 #endif
 }
 
Index: libstdc++-v3/libsupc++/typeinfo
===================================================================
--- libstdc++-v3/libsupc++/typeinfo	(revision 153489)
+++ libstdc++-v3/libsupc++/typeinfo	(working copy)
@@ -94,7 +94,7 @@
     /** Returns an @e implementation-defined byte string; this is not
      *  portable between compilers!  */
     const char* name() const
-    { return __name; }
+    { return __name[0] == '*' ? __name + 1 : __name; }
 
 #if !__GXX_TYPEINFO_EQUALITY_INLINE
     // In old abi, or when weak symbols are not supported, there can
@@ -110,12 +110,15 @@
     // we can run into cases where type_info names aren't merged,
     // so we still need to do string comparison.
     bool before(const type_info& __arg) const
-    { return __builtin_strcmp (__name, __arg.__name) < 0; }
+    { return (__name[0] == '*' && __arg.__name[0] == '*')
+	? __name < __arg.__name
+	: __builtin_strcmp (__name, __arg.__name) < 0; }
 
     bool operator==(const type_info& __arg) const
     {
       return ((__name == __arg.__name)
-	      || __builtin_strcmp (__name, __arg.__name) == 0);
+	      || (__name[0] != '*' &&
+		  __builtin_strcmp (__name, __arg.__name) == 0));
     }
   #else
     // On some targets we can rely on type_info's NTBS being unique,
Index: libstdc++-v3/libsupc++/tinfo.cc
===================================================================
--- libstdc++-v3/libsupc++/tinfo.cc	(revision 153489)
+++ libstdc++-v3/libsupc++/tinfo.cc	(working copy)
@@ -41,7 +41,8 @@
 #if __GXX_MERGED_TYPEINFO_NAMES
   return name () == arg.name ();
 #else
-  return (&arg == this) || (__builtin_strcmp (name (), arg.name ()) ==
0);
+  return (&arg == this)
+    || (name ()[0] != '*' && (__builtin_strcmp (name (), arg.name ())
== 0));
 #endif
 }
 
Index: libstdc++-v3/ChangeLog
===================================================================
--- libstdc++-v3/ChangeLog	(revision 153489)
+++ libstdc++-v3/ChangeLog	(working copy)
@@ -1,3 +1,10 @@
+2009-10-28  Jerry Quinn  <jlquinn@optonline.net>
+
+	* libsupc++/tinfo.cc (operator=(const type_info&)): Compare by
+	pointer if name begins with '*'.
+	* libsupc++/typeinfo (type_info::name()): Likewise.
+	* libsupc++/tinfo2.cc (before):  Likewise.
+
 009-10-20  Paolo Carlini  <paolo.carlini@oracle.com>
 
         PR libstdc++/41773