485 lines
14 KiB
C
485 lines
14 KiB
C
/* Help friends in C++.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "tree.h"
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#include "rtl.h"
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#include "cp-tree.h"
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#include "flags.h"
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#include "output.h"
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#include "toplev.h"
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static void add_friend PROTO((tree, tree));
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static void add_friends PROTO((tree, tree, tree));
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/* Friend data structures are described in cp-tree.h. */
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int
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is_friend (type, supplicant)
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tree type, supplicant;
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{
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int declp;
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register tree list;
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tree context;
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if (supplicant == NULL_TREE || type == NULL_TREE)
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return 0;
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declp = (TREE_CODE_CLASS (TREE_CODE (supplicant)) == 'd');
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if (declp)
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/* It's a function decl. */
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{
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tree list = DECL_FRIENDLIST (TYPE_MAIN_DECL (type));
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tree name = DECL_NAME (supplicant);
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tree ctype;
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if (DECL_FUNCTION_MEMBER_P (supplicant))
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ctype = DECL_CLASS_CONTEXT (supplicant);
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else
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ctype = NULL_TREE;
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for (; list ; list = TREE_CHAIN (list))
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{
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if (name == TREE_PURPOSE (list))
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{
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tree friends = TREE_VALUE (list);
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for (; friends ; friends = TREE_CHAIN (friends))
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{
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if (comptypes (ctype, TREE_PURPOSE (friends), 1))
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return 1;
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if (TREE_VALUE (friends) == NULL_TREE)
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continue;
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if (TREE_CODE (TREE_VALUE (friends)) == TEMPLATE_DECL)
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{
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if (is_specialization_of (supplicant,
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TREE_VALUE (friends)))
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return 1;
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continue;
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}
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/* FIXME: The use of comptypes here is bogus, since
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two specializations of a template with non-type
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parameters may have the same type, but be
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different. */
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if (comptypes (TREE_TYPE (supplicant),
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TREE_TYPE (TREE_VALUE (friends)), 1))
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return 1;
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}
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break;
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}
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}
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}
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else
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/* It's a type. */
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{
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if (type == supplicant)
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return 1;
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list = CLASSTYPE_FRIEND_CLASSES (TREE_TYPE (TYPE_MAIN_DECL (type)));
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for (; list ; list = TREE_CHAIN (list))
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{
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tree t = TREE_VALUE (list);
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if (TREE_CODE (t) == TEMPLATE_DECL ?
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is_specialization_of (TYPE_MAIN_DECL (supplicant), t) :
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comptypes (supplicant, t, 1))
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return 1;
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}
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}
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if (declp && DECL_FUNCTION_MEMBER_P (supplicant))
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context = DECL_CLASS_CONTEXT (supplicant);
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else if (! declp)
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/* Local classes have the same access as the enclosing function. */
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context = hack_decl_function_context (TYPE_MAIN_DECL (supplicant));
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else
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context = NULL_TREE;
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/* A namespace is not friend to anybody. */
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if (context && TREE_CODE (context) == NAMESPACE_DECL)
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context = NULL_TREE;
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if (context)
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return is_friend (type, context);
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return 0;
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}
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/* Add a new friend to the friends of the aggregate type TYPE.
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DECL is the FUNCTION_DECL of the friend being added. */
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static void
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add_friend (type, decl)
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tree type, decl;
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{
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tree typedecl = TYPE_MAIN_DECL (type);
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tree list = DECL_FRIENDLIST (typedecl);
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tree name = DECL_NAME (decl);
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while (list)
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{
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if (name == TREE_PURPOSE (list))
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{
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tree friends = TREE_VALUE (list);
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for (; friends ; friends = TREE_CHAIN (friends))
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{
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if (decl == TREE_VALUE (friends))
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{
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cp_warning ("`%D' is already a friend of class `%T'",
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decl, type);
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cp_warning_at ("previous friend declaration of `%D'",
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TREE_VALUE (friends));
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return;
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}
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}
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TREE_VALUE (list) = tree_cons (error_mark_node, decl,
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TREE_VALUE (list));
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return;
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}
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list = TREE_CHAIN (list);
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}
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DECL_FRIENDLIST (typedecl)
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= tree_cons (DECL_NAME (decl), build_tree_list (error_mark_node, decl),
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DECL_FRIENDLIST (typedecl));
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if (DECL_NAME (decl) == ansi_opname[(int) MODIFY_EXPR])
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{
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tree parmtypes = TYPE_ARG_TYPES (TREE_TYPE (decl));
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TYPE_HAS_ASSIGNMENT (TREE_TYPE (typedecl)) = 1;
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if (parmtypes && TREE_CHAIN (parmtypes))
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{
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tree parmtype = TREE_VALUE (TREE_CHAIN (parmtypes));
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if (TREE_CODE (parmtype) == REFERENCE_TYPE
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&& TREE_TYPE (parmtypes) == TREE_TYPE (typedecl))
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TYPE_HAS_ASSIGN_REF (TREE_TYPE (typedecl)) = 1;
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}
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}
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}
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/* Declare that every member function NAME in FRIEND_TYPE
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(which may be NULL_TREE) is a friend of type TYPE. */
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static void
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add_friends (type, name, friend_type)
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tree type, name, friend_type;
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{
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tree typedecl = TYPE_MAIN_DECL (type);
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tree list = DECL_FRIENDLIST (typedecl);
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while (list)
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{
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if (name == TREE_PURPOSE (list))
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{
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tree friends = TREE_VALUE (list);
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while (friends && TREE_PURPOSE (friends) != friend_type)
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friends = TREE_CHAIN (friends);
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if (friends)
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{
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if (friend_type)
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warning ("method `%s::%s' is already a friend of class",
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TYPE_NAME_STRING (friend_type),
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IDENTIFIER_POINTER (name));
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else
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warning ("function `%s' is already a friend of class `%s'",
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IDENTIFIER_POINTER (name),
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IDENTIFIER_POINTER (DECL_NAME (typedecl)));
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}
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else
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TREE_VALUE (list) = tree_cons (friend_type, NULL_TREE,
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TREE_VALUE (list));
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return;
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}
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list = TREE_CHAIN (list);
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}
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DECL_FRIENDLIST (typedecl)
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= tree_cons (name,
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build_tree_list (friend_type, NULL_TREE),
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DECL_FRIENDLIST (typedecl));
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if (! strncmp (IDENTIFIER_POINTER (name),
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IDENTIFIER_POINTER (ansi_opname[(int) MODIFY_EXPR]),
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strlen (IDENTIFIER_POINTER (ansi_opname[(int) MODIFY_EXPR]))))
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{
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TYPE_HAS_ASSIGNMENT (TREE_TYPE (typedecl)) = 1;
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sorry ("declaring \"friend operator =\" will not find \"operator = (X&)\" if it exists");
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}
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}
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/* Make FRIEND_TYPE a friend class to TYPE. If FRIEND_TYPE has already
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been defined, we make all of its member functions friends of
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TYPE. If not, we make it a pending friend, which can later be added
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when its definition is seen. If a type is defined, then its TYPE_DECL's
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DECL_UNDEFINED_FRIENDS contains a (possibly empty) list of friend
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classes that are not defined. If a type has not yet been defined,
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then the DECL_WAITING_FRIENDS contains a list of types
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waiting to make it their friend. Note that these two can both
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be in use at the same time! */
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void
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make_friend_class (type, friend_type)
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tree type, friend_type;
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{
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tree classes;
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int is_template_friend;
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if (IS_SIGNATURE (type))
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{
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error ("`friend' declaration in signature definition");
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return;
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}
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if (IS_SIGNATURE (friend_type))
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{
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error ("signature type `%s' declared `friend'",
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IDENTIFIER_POINTER (TYPE_IDENTIFIER (friend_type)));
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return;
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}
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if (processing_template_decl > template_class_depth (type))
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/* If the TYPE is a template then it makes sense for it to be
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friends with itself; this means that each instantiation is
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friends with all other instantiations. */
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is_template_friend = 1;
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else if (comptypes (type, friend_type, 1))
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{
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pedwarn ("class `%s' is implicitly friends with itself",
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TYPE_NAME_STRING (type));
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return;
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}
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else
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is_template_friend = 0;
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GNU_xref_hier (type, friend_type, 0, 0, 1);
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if (is_template_friend)
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friend_type = CLASSTYPE_TI_TEMPLATE (friend_type);
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classes = CLASSTYPE_FRIEND_CLASSES (type);
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while (classes
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/* Stop if we find the same type on the list. */
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&& !(TREE_CODE (TREE_VALUE (classes)) == TEMPLATE_DECL ?
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friend_type == TREE_VALUE (classes) :
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comptypes (TREE_VALUE (classes), friend_type, 1)))
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classes = TREE_CHAIN (classes);
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if (classes)
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cp_warning ("`%T' is already a friend of `%T'",
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TREE_VALUE (classes), type);
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else
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{
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CLASSTYPE_FRIEND_CLASSES (type)
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= tree_cons (NULL_TREE, friend_type, CLASSTYPE_FRIEND_CLASSES (type));
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}
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}
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/* Main friend processor. This is large, and for modularity purposes,
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has been removed from grokdeclarator. It returns `void_type_node'
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to indicate that something happened, though a FIELD_DECL is
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not returned.
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CTYPE is the class this friend belongs to.
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DECLARATOR is the name of the friend.
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DECL is the FUNCTION_DECL that the friend is.
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In case we are parsing a friend which is part of an inline
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definition, we will need to store PARM_DECL chain that comes
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with it into the DECL_ARGUMENTS slot of the FUNCTION_DECL.
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FLAGS is just used for `grokclassfn'.
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QUALS say what special qualifies should apply to the object
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pointed to by `this'. */
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tree
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do_friend (ctype, declarator, decl, parmdecls, flags, quals, funcdef_flag)
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tree ctype, declarator, decl, parmdecls;
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enum overload_flags flags;
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tree quals;
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int funcdef_flag;
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{
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int is_friend_template = 0;
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/* Every decl that gets here is a friend of something. */
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DECL_FRIEND_P (decl) = 1;
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if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
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{
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declarator = TREE_OPERAND (declarator, 0);
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if (TREE_CODE (declarator) == LOOKUP_EXPR)
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declarator = TREE_OPERAND (declarator, 0);
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if (is_overloaded_fn (declarator))
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declarator = DECL_NAME (get_first_fn (declarator));
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}
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if (TREE_CODE (decl) == FUNCTION_DECL)
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is_friend_template = processing_template_decl >
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template_class_depth (current_class_type);
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if (ctype)
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{
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tree cname = TYPE_NAME (ctype);
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if (TREE_CODE (cname) == TYPE_DECL)
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cname = DECL_NAME (cname);
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/* A method friend. */
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if (TREE_CODE (decl) == FUNCTION_DECL)
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{
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if (flags == NO_SPECIAL && ctype && declarator == cname)
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DECL_CONSTRUCTOR_P (decl) = 1;
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/* This will set up DECL_ARGUMENTS for us. */
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grokclassfn (ctype, cname, decl, flags, quals);
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if (is_friend_template)
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decl = DECL_TI_TEMPLATE (push_template_decl (decl));
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if (TYPE_SIZE (ctype) != 0 && template_class_depth (ctype) == 0)
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decl = check_classfn (ctype, decl);
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/* TYPE_BEING_DEFINED is a hack for nested classes having
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member functions of the enclosing class as friends. Will
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go away as parsing of classes gets rewritten. */
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if (TREE_TYPE (decl) != error_mark_node)
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{
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if (TYPE_BEING_DEFINED (ctype) ||
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TYPE_SIZE (ctype) || template_class_depth (ctype) > 0)
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add_friend (current_class_type, decl);
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else
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cp_error ("member `%D' declared as friend before type `%T' defined",
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decl, ctype);
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}
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}
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else
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{
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/* Possibly a bunch of method friends. */
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/* Get the class they belong to. */
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tree ctype = IDENTIFIER_TYPE_VALUE (cname);
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tree fields = lookup_fnfields (TYPE_BINFO (ctype), declarator, 0);
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if (fields)
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add_friends (current_class_type, declarator, ctype);
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else
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cp_error ("method `%D' is not a member of class `%T'",
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declarator, ctype);
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decl = void_type_node;
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}
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}
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else if (TREE_CODE (decl) == FUNCTION_DECL
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&& (MAIN_NAME_P (declarator)
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|| (IDENTIFIER_LENGTH (declarator) > 10
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&& IDENTIFIER_POINTER (declarator)[0] == '_'
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&& IDENTIFIER_POINTER (declarator)[1] == '_'
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&& strncmp (IDENTIFIER_POINTER (declarator)+2,
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"builtin_", 8) == 0)))
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{
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/* raw "main", and builtin functions never gets overloaded,
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but they can become friends. */
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add_friend (current_class_type, decl);
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DECL_FRIEND_P (decl) = 1;
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decl = void_type_node;
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}
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/* A global friend.
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@@ or possibly a friend from a base class ?!? */
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else if (TREE_CODE (decl) == FUNCTION_DECL)
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{
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/* Friends must all go through the overload machinery,
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even though they may not technically be overloaded.
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Note that because classes all wind up being top-level
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in their scope, their friend wind up in top-level scope as well. */
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DECL_ASSEMBLER_NAME (decl)
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= build_decl_overload (declarator, TYPE_ARG_TYPES (TREE_TYPE (decl)),
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TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE);
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DECL_ARGUMENTS (decl) = parmdecls;
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if (funcdef_flag)
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DECL_CLASS_CONTEXT (decl) = current_class_type;
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if (! DECL_USE_TEMPLATE (decl))
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{
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/* We can call pushdecl here, because the TREE_CHAIN of this
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FUNCTION_DECL is not needed for other purposes. Don't do this
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for a template instantiation. */
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if (!is_friend_template)
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{
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/* However, we don't call pushdecl() for a friend
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function of a template class, since in general,
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such a declaration depends on template
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parameters. Instead, we call pushdecl when the
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class is instantiated. */
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if (template_class_depth (current_class_type) == 0)
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decl = pushdecl (decl);
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}
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else
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decl = push_template_decl (decl);
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if (! funcdef_flag && ! flag_guiding_decls && ! is_friend_template
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&& current_template_parms && uses_template_parms (decl))
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{
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static int explained;
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cp_warning ("friend declaration `%#D'", decl);
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warning (" declares a non-template function");
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if (! explained)
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{
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warning (" (if this is not what you intended, make sure");
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warning (" the function template has already been declared,");
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warning (" and add <> after the function name here)");
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explained = 1;
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}
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}
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}
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make_decl_rtl (decl, NULL_PTR, 1);
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add_friend (current_class_type,
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is_friend_template ? DECL_TI_TEMPLATE (decl) : decl);
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DECL_FRIEND_P (decl) = 1;
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}
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else
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{
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/* @@ Should be able to ingest later definitions of this function
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before use. */
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tree decl = lookup_name_nonclass (declarator);
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if (decl == NULL_TREE)
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{
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cp_warning ("implicitly declaring `%T' as struct", declarator);
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decl = xref_tag (record_type_node, declarator, NULL_TREE, 1);
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decl = TYPE_MAIN_DECL (decl);
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}
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/* Allow abbreviated declarations of overloaded functions,
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but not if those functions are really class names. */
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if (TREE_CODE (decl) == TREE_LIST && TREE_TYPE (TREE_PURPOSE (decl)))
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{
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cp_warning ("`friend %T' archaic, use `friend class %T' instead",
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declarator, declarator);
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decl = TREE_TYPE (TREE_PURPOSE (decl));
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}
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if (TREE_CODE (decl) == TREE_LIST)
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add_friends (current_class_type, TREE_PURPOSE (decl), NULL_TREE);
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else
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make_friend_class (current_class_type, TREE_TYPE (decl));
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decl = void_type_node;
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}
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return decl;
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}
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