freebsd-dev/contrib/gcc/cp/friend.c
2004-07-28 03:11:36 +00:00

496 lines
14 KiB
C

/* Help friends in C++.
Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "expr.h"
#include "cp-tree.h"
#include "flags.h"
#include "output.h"
#include "toplev.h"
/* Friend data structures are described in cp-tree.h. */
/* Returns nonzero if SUPPLICANT is a friend of TYPE. */
int
is_friend (tree type, tree supplicant)
{
int declp;
tree list;
tree context;
if (supplicant == NULL_TREE || type == NULL_TREE)
return 0;
declp = DECL_P (supplicant);
if (declp)
/* It's a function decl. */
{
tree list = DECL_FRIENDLIST (TYPE_MAIN_DECL (type));
tree name = DECL_NAME (supplicant);
for (; list ; list = TREE_CHAIN (list))
{
if (name == FRIEND_NAME (list))
{
tree friends = FRIEND_DECLS (list);
for (; friends ; friends = TREE_CHAIN (friends))
{
tree friend = TREE_VALUE (friends);
if (friend == NULL_TREE)
continue;
if (supplicant == friend)
return 1;
if (is_specialization_of_friend (supplicant, friend))
return 1;
}
break;
}
}
}
else
/* It's a type. */
{
/* Nested classes are implicitly friends of their enclosing types, as
per core issue 45 (this is a change from the standard). */
for (context = supplicant;
context && TYPE_P (context);
context = TYPE_CONTEXT (context))
if (type == context)
return 1;
list = CLASSTYPE_FRIEND_CLASSES (TREE_TYPE (TYPE_MAIN_DECL (type)));
for (; list ; list = TREE_CHAIN (list))
{
tree t = TREE_VALUE (list);
if (TREE_CODE (t) == TEMPLATE_DECL ?
is_specialization_of (TYPE_MAIN_DECL (supplicant), t) :
same_type_p (supplicant, t))
return 1;
}
}
if (declp && DECL_FUNCTION_MEMBER_P (supplicant))
context = DECL_CONTEXT (supplicant);
else if (! declp)
/* Local classes have the same access as the enclosing function. */
context = decl_function_context (TYPE_MAIN_DECL (supplicant));
else
context = NULL_TREE;
/* A namespace is not friend to anybody. */
if (context && TREE_CODE (context) == NAMESPACE_DECL)
context = NULL_TREE;
if (context)
return is_friend (type, context);
return 0;
}
/* Add a new friend to the friends of the aggregate type TYPE.
DECL is the FUNCTION_DECL of the friend being added.
If COMPLAIN is true, warning about duplicate friend is issued.
We want to have this diagnostics during parsing but not
when a template is being instantiated. */
void
add_friend (tree type, tree decl, bool complain)
{
tree typedecl;
tree list;
tree name;
if (decl == error_mark_node)
return;
typedecl = TYPE_MAIN_DECL (type);
list = DECL_FRIENDLIST (typedecl);
name = DECL_NAME (decl);
type = TREE_TYPE (typedecl);
while (list)
{
if (name == FRIEND_NAME (list))
{
tree friends = FRIEND_DECLS (list);
for (; friends ; friends = TREE_CHAIN (friends))
{
if (decl == TREE_VALUE (friends))
{
if (complain)
warning ("`%D' is already a friend of class `%T'",
decl, type);
return;
}
}
maybe_add_class_template_decl_list (type, decl, /*friend_p=*/1);
TREE_VALUE (list) = tree_cons (NULL_TREE, decl,
TREE_VALUE (list));
return;
}
list = TREE_CHAIN (list);
}
if (DECL_CLASS_SCOPE_P (decl))
{
tree class_binfo = TYPE_BINFO (DECL_CONTEXT (decl));
if (!uses_template_parms (BINFO_TYPE (class_binfo)))
perform_or_defer_access_check (class_binfo, decl);
}
maybe_add_class_template_decl_list (type, decl, /*friend_p=*/1);
DECL_FRIENDLIST (typedecl)
= tree_cons (DECL_NAME (decl), build_tree_list (NULL_TREE, decl),
DECL_FRIENDLIST (typedecl));
if (!uses_template_parms (type))
DECL_BEFRIENDING_CLASSES (decl)
= tree_cons (NULL_TREE, type,
DECL_BEFRIENDING_CLASSES (decl));
}
/* Make FRIEND_TYPE a friend class to TYPE. If FRIEND_TYPE has already
been defined, we make all of its member functions friends of
TYPE. If not, we make it a pending friend, which can later be added
when its definition is seen. If a type is defined, then its TYPE_DECL's
DECL_UNDEFINED_FRIENDS contains a (possibly empty) list of friend
classes that are not defined. If a type has not yet been defined,
then the DECL_WAITING_FRIENDS contains a list of types
waiting to make it their friend. Note that these two can both
be in use at the same time!
If COMPLAIN is true, warning about duplicate friend is issued.
We want to have this diagnostics during parsing but not
when a template is being instantiated. */
void
make_friend_class (tree type, tree friend_type, bool complain)
{
tree classes;
int is_template_friend;
if (! IS_AGGR_TYPE (friend_type))
{
error ("invalid type `%T' declared `friend'", friend_type);
return;
}
if (processing_template_decl > template_class_depth (type))
/* If the TYPE is a template then it makes sense for it to be
friends with itself; this means that each instantiation is
friends with all other instantiations. */
{
if (CLASS_TYPE_P (friend_type)
&& CLASSTYPE_TEMPLATE_SPECIALIZATION (friend_type)
&& uses_template_parms (friend_type))
{
/* [temp.friend]
Friend declarations shall not declare partial
specializations. */
error ("partial specialization `%T' declared `friend'",
friend_type);
return;
}
is_template_friend = 1;
}
else if (same_type_p (type, friend_type))
{
if (complain)
pedwarn ("class `%T' is implicitly friends with itself",
type);
return;
}
else
is_template_friend = 0;
/* [temp.friend]
A friend of a class or class template can be a function or
class template, a specialization of a function template or
class template, or an ordinary (nontemplate) function or
class. */
if (!is_template_friend)
;/* ok */
else if (TREE_CODE (friend_type) == TYPENAME_TYPE)
{
/* template <class T> friend typename S<T>::X; */
error ("typename type `%#T' declared `friend'", friend_type);
return;
}
else if (TREE_CODE (friend_type) == TEMPLATE_TYPE_PARM)
{
/* template <class T> friend class T; */
error ("template parameter type `%T' declared `friend'", friend_type);
return;
}
else if (!CLASSTYPE_TEMPLATE_INFO (friend_type))
{
/* template <class T> friend class A; where A is not a template */
error ("`%#T' is not a template", friend_type);
return;
}
if (is_template_friend)
friend_type = CLASSTYPE_TI_TEMPLATE (friend_type);
/* See if it is already a friend. */
for (classes = CLASSTYPE_FRIEND_CLASSES (type);
classes;
classes = TREE_CHAIN (classes))
{
tree probe = TREE_VALUE (classes);
if (TREE_CODE (friend_type) == TEMPLATE_DECL)
{
if (friend_type == probe)
{
if (complain)
warning ("`%D' is already a friend of `%T'",
probe, type);
break;
}
}
else if (TREE_CODE (probe) != TEMPLATE_DECL)
{
if (same_type_p (probe, friend_type))
{
if (complain)
warning ("`%T' is already a friend of `%T'",
probe, type);
break;
}
}
}
if (!classes)
{
maybe_add_class_template_decl_list (type, friend_type, /*friend_p=*/1);
CLASSTYPE_FRIEND_CLASSES (type)
= tree_cons (NULL_TREE, friend_type, CLASSTYPE_FRIEND_CLASSES (type));
if (is_template_friend)
friend_type = TREE_TYPE (friend_type);
if (!uses_template_parms (type))
CLASSTYPE_BEFRIENDING_CLASSES (friend_type)
= tree_cons (NULL_TREE, type,
CLASSTYPE_BEFRIENDING_CLASSES (friend_type));
}
}
/* Main friend processor.
CTYPE is the class this friend belongs to.
DECLARATOR is the name of the friend.
DECL is the FUNCTION_DECL that the friend is.
FLAGS is just used for `grokclassfn'.
QUALS say what special qualifies should apply to the object
pointed to by `this'. */
tree
do_friend (tree ctype, tree declarator, tree decl,
tree attrlist, enum overload_flags flags, tree quals,
int funcdef_flag)
{
/* Every decl that gets here is a friend of something. */
DECL_FRIEND_P (decl) = 1;
if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR)
{
declarator = TREE_OPERAND (declarator, 0);
if (is_overloaded_fn (declarator))
declarator = DECL_NAME (get_first_fn (declarator));
}
if (TREE_CODE (decl) != FUNCTION_DECL)
abort ();
if (ctype)
{
/* CLASS_TEMPLATE_DEPTH counts the number of template headers for
the enclosing class. FRIEND_DEPTH counts the number of template
headers used for this friend declaration. TEMPLATE_MEMBER_P is
true if a template header in FRIEND_DEPTH is intended for
DECLARATOR. For example, the code
template <class T> struct A {
template <class U> struct B {
template <class V> template <class W>
friend void C<V>::f(W);
};
};
will eventually give the following results
1. CLASS_TEMPLATE_DEPTH equals 2 (for `T' and `U').
2. FRIEND_DEPTH equals 2 (for `V' and `W').
3. TEMPLATE_MEMBER_P is true (for `W'). */
int class_template_depth = template_class_depth (current_class_type);
int friend_depth = processing_template_decl - class_template_depth;
/* We will figure this out later. */
bool template_member_p = false;
tree cname = TYPE_NAME (ctype);
if (TREE_CODE (cname) == TYPE_DECL)
cname = DECL_NAME (cname);
/* A method friend. */
if (flags == NO_SPECIAL && declarator == cname)
DECL_CONSTRUCTOR_P (decl) = 1;
/* This will set up DECL_ARGUMENTS for us. */
grokclassfn (ctype, decl, flags, quals);
if (friend_depth)
{
if (!uses_template_parms_level (ctype, class_template_depth
+ friend_depth))
template_member_p = true;
}
/* A nested class may declare a member of an enclosing class
to be a friend, so we do lookup here even if CTYPE is in
the process of being defined. */
if (class_template_depth
|| COMPLETE_TYPE_P (ctype)
|| TYPE_BEING_DEFINED (ctype))
{
if (DECL_TEMPLATE_INFO (decl))
/* DECL is a template specialization. No need to
build a new TEMPLATE_DECL. */
;
else if (class_template_depth)
/* We rely on tsubst_friend_function to check the
validity of the declaration later. */
decl = push_template_decl_real (decl, /*is_friend=*/1);
else
decl = check_classfn (ctype, decl, template_member_p);
if (template_member_p && decl && TREE_CODE (decl) == FUNCTION_DECL)
decl = DECL_TI_TEMPLATE (decl);
if (decl)
add_friend (current_class_type, decl, /*complain=*/true);
}
else
error ("member `%D' declared as friend before type `%T' defined",
decl, ctype);
}
/* A global friend.
@@ or possibly a friend from a base class ?!? */
else if (TREE_CODE (decl) == FUNCTION_DECL)
{
int is_friend_template = PROCESSING_REAL_TEMPLATE_DECL_P ();
/* Friends must all go through the overload machinery,
even though they may not technically be overloaded.
Note that because classes all wind up being top-level
in their scope, their friend wind up in top-level scope as well. */
if (funcdef_flag)
SET_DECL_FRIEND_CONTEXT (decl, current_class_type);
if (! DECL_USE_TEMPLATE (decl))
{
/* We must check whether the decl refers to template
arguments before push_template_decl_real adds a
reference to the containing template class. */
int warn = (warn_nontemplate_friend
&& ! funcdef_flag && ! is_friend_template
&& current_template_parms
&& uses_template_parms (decl));
if (is_friend_template
|| template_class_depth (current_class_type) != 0)
/* We can't call pushdecl for a template class, since in
general, such a declaration depends on template
parameters. Instead, we call pushdecl when the class
is instantiated. */
decl = push_template_decl_real (decl, /*is_friend=*/1);
else if (current_function_decl)
/* This must be a local class, so pushdecl will be ok, and
insert an unqualified friend into the local scope
(rather than the containing namespace scope, which the
next choice will do). */
decl = pushdecl (decl);
else
{
/* We can't use pushdecl, as we might be in a template
class specialization, and pushdecl will insert an
unqualified friend decl into the template parameter
scope, rather than the namespace containing it. */
tree ns = decl_namespace_context (decl);
push_nested_namespace (ns);
decl = pushdecl_namespace_level (decl);
pop_nested_namespace (ns);
}
if (warn)
{
static int explained;
warning ("friend declaration `%#D' declares a non-template function", decl);
if (! explained)
{
warning ("(if this is not what you intended, make sure the function template has already been declared and add <> after the function name here) -Wno-non-template-friend disables this warning");
explained = 1;
}
}
}
if (decl == error_mark_node)
return error_mark_node;
add_friend (current_class_type,
is_friend_template ? DECL_TI_TEMPLATE (decl) : decl,
/*complain=*/true);
DECL_FRIEND_P (decl) = 1;
}
/* Unfortunately, we have to handle attributes here. Normally we would
handle them in start_decl_1, but since this is a friend decl start_decl_1
never gets to see it. */
/* Set attributes here so if duplicate decl, will have proper attributes. */
cplus_decl_attributes (&decl, attrlist, 0);
return decl;
}