1 /* Functions dealing with attribute handling, used by most front ends.
2 Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
24 #include "coretypes.h"
35 #include "langhooks.h"
37 static void init_attributes (void);
39 /* Table of the tables of attributes (common, language, format, machine)
41 static const struct attribute_spec
*attribute_tables
[4];
43 static bool attributes_initialized
= false;
45 /* Default empty table of attributes. */
46 static const struct attribute_spec empty_attribute_table
[] =
48 { NULL
, 0, 0, false, false, false, NULL
}
51 /* Initialize attribute tables, and make some sanity checks
52 if --enable-checking. */
55 init_attributes (void)
59 attribute_tables
[0] = lang_hooks
.common_attribute_table
;
60 attribute_tables
[1] = lang_hooks
.attribute_table
;
61 attribute_tables
[2] = lang_hooks
.format_attribute_table
;
62 attribute_tables
[3] = targetm
.attribute_table
;
64 /* Translate NULL pointers to pointers to the empty table. */
65 for (i
= 0; i
< ARRAY_SIZE (attribute_tables
); i
++)
66 if (attribute_tables
[i
] == NULL
)
67 attribute_tables
[i
] = empty_attribute_table
;
69 #ifdef ENABLE_CHECKING
70 /* Make some sanity checks on the attribute tables. */
71 for (i
= 0; i
< ARRAY_SIZE (attribute_tables
); i
++)
75 for (j
= 0; attribute_tables
[i
][j
].name
!= NULL
; j
++)
77 /* The name must not begin and end with __. */
78 const char *name
= attribute_tables
[i
][j
].name
;
79 int len
= strlen (name
);
81 gcc_assert (!(name
[0] == '_' && name
[1] == '_'
82 && name
[len
- 1] == '_' && name
[len
- 2] == '_'));
84 /* The minimum and maximum lengths must be consistent. */
85 gcc_assert (attribute_tables
[i
][j
].min_length
>= 0);
87 gcc_assert (attribute_tables
[i
][j
].max_length
== -1
88 || (attribute_tables
[i
][j
].max_length
89 >= attribute_tables
[i
][j
].min_length
));
91 /* An attribute cannot require both a DECL and a TYPE. */
92 gcc_assert (!attribute_tables
[i
][j
].decl_required
93 || !attribute_tables
[i
][j
].type_required
);
95 /* If an attribute requires a function type, in particular
96 it requires a type. */
97 gcc_assert (!attribute_tables
[i
][j
].function_type_required
98 || attribute_tables
[i
][j
].type_required
);
102 /* Check that each name occurs just once in each table. */
103 for (i
= 0; i
< ARRAY_SIZE (attribute_tables
); i
++)
106 for (j
= 0; attribute_tables
[i
][j
].name
!= NULL
; j
++)
107 for (k
= j
+ 1; attribute_tables
[i
][k
].name
!= NULL
; k
++)
108 gcc_assert (strcmp (attribute_tables
[i
][j
].name
,
109 attribute_tables
[i
][k
].name
));
111 /* Check that no name occurs in more than one table. */
112 for (i
= 0; i
< ARRAY_SIZE (attribute_tables
); i
++)
116 for (j
= i
+ 1; j
< ARRAY_SIZE (attribute_tables
); j
++)
117 for (k
= 0; attribute_tables
[i
][k
].name
!= NULL
; k
++)
118 for (l
= 0; attribute_tables
[j
][l
].name
!= NULL
; l
++)
119 gcc_assert (strcmp (attribute_tables
[i
][k
].name
,
120 attribute_tables
[j
][l
].name
));
124 attributes_initialized
= true;
127 /* Process the attributes listed in ATTRIBUTES and install them in *NODE,
128 which is either a DECL (including a TYPE_DECL) or a TYPE. If a DECL,
129 it should be modified in place; if a TYPE, a copy should be created
130 unless ATTR_FLAG_TYPE_IN_PLACE is set in FLAGS. FLAGS gives further
131 information, in the form of a bitwise OR of flags in enum attribute_flags
132 from tree.h. Depending on these flags, some attributes may be
133 returned to be applied at a later stage (for example, to apply
134 a decl attribute to the declaration rather than to its type). */
137 decl_attributes (tree
*node
, tree attributes
, int flags
)
140 tree returned_attrs
= NULL_TREE
;
142 if (!attributes_initialized
)
145 targetm
.insert_attributes (*node
, &attributes
);
147 for (a
= attributes
; a
; a
= TREE_CHAIN (a
))
149 tree name
= TREE_PURPOSE (a
);
150 tree args
= TREE_VALUE (a
);
152 const struct attribute_spec
*spec
= NULL
;
153 bool no_add_attrs
= 0;
154 tree fn_ptr_tmp
= NULL_TREE
;
157 for (i
= 0; i
< ARRAY_SIZE (attribute_tables
); i
++)
161 for (j
= 0; attribute_tables
[i
][j
].name
!= NULL
; j
++)
163 if (is_attribute_p (attribute_tables
[i
][j
].name
, name
))
165 spec
= &attribute_tables
[i
][j
];
175 warning ("%qs attribute directive ignored",
176 IDENTIFIER_POINTER (name
));
179 else if (list_length (args
) < spec
->min_length
180 || (spec
->max_length
>= 0
181 && list_length (args
) > spec
->max_length
))
183 error ("wrong number of arguments specified for %qs attribute",
184 IDENTIFIER_POINTER (name
));
188 if (spec
->decl_required
&& !DECL_P (*anode
))
190 if (flags
& ((int) ATTR_FLAG_DECL_NEXT
191 | (int) ATTR_FLAG_FUNCTION_NEXT
192 | (int) ATTR_FLAG_ARRAY_NEXT
))
194 /* Pass on this attribute to be tried again. */
195 returned_attrs
= tree_cons (name
, args
, returned_attrs
);
200 warning ("%qs attribute does not apply to types",
201 IDENTIFIER_POINTER (name
));
206 /* If we require a type, but were passed a decl, set up to make a
207 new type and update the one in the decl. ATTR_FLAG_TYPE_IN_PLACE
208 would have applied if we'd been passed a type, but we cannot modify
209 the decl's type in place here. */
210 if (spec
->type_required
&& DECL_P (*anode
))
212 anode
= &TREE_TYPE (*anode
);
213 flags
&= ~(int) ATTR_FLAG_TYPE_IN_PLACE
;
216 if (spec
->function_type_required
&& TREE_CODE (*anode
) != FUNCTION_TYPE
217 && TREE_CODE (*anode
) != METHOD_TYPE
)
219 if (TREE_CODE (*anode
) == POINTER_TYPE
220 && (TREE_CODE (TREE_TYPE (*anode
)) == FUNCTION_TYPE
221 || TREE_CODE (TREE_TYPE (*anode
)) == METHOD_TYPE
))
223 /* OK, this is a bit convoluted. We can't just make a copy
224 of the pointer type and modify its TREE_TYPE, because if
225 we change the attributes of the target type the pointer
226 type needs to have a different TYPE_MAIN_VARIANT. So we
227 pull out the target type now, frob it as appropriate, and
228 rebuild the pointer type later.
230 This would all be simpler if attributes were part of the
231 declarator, grumble grumble. */
232 fn_ptr_tmp
= TREE_TYPE (*anode
);
234 flags
&= ~(int) ATTR_FLAG_TYPE_IN_PLACE
;
236 else if (flags
& (int) ATTR_FLAG_FUNCTION_NEXT
)
238 /* Pass on this attribute to be tried again. */
239 returned_attrs
= tree_cons (name
, args
, returned_attrs
);
243 if (TREE_CODE (*anode
) != FUNCTION_TYPE
244 && TREE_CODE (*anode
) != METHOD_TYPE
)
246 warning ("%qs attribute only applies to function types",
247 IDENTIFIER_POINTER (name
));
252 if (spec
->handler
!= NULL
)
253 returned_attrs
= chainon ((*spec
->handler
) (anode
, name
, args
,
254 flags
, &no_add_attrs
),
257 /* Layout the decl in case anything changed. */
258 if (spec
->type_required
&& DECL_P (*node
)
259 && (TREE_CODE (*node
) == VAR_DECL
260 || TREE_CODE (*node
) == PARM_DECL
261 || TREE_CODE (*node
) == RESULT_DECL
))
262 relayout_decl (*node
);
270 old_attrs
= DECL_ATTRIBUTES (*anode
);
272 old_attrs
= TYPE_ATTRIBUTES (*anode
);
274 for (a
= lookup_attribute (spec
->name
, old_attrs
);
276 a
= lookup_attribute (spec
->name
, TREE_CHAIN (a
)))
278 if (simple_cst_equal (TREE_VALUE (a
), args
) == 1)
284 /* This attribute isn't already in the list. */
286 DECL_ATTRIBUTES (*anode
) = tree_cons (name
, args
, old_attrs
);
287 else if (flags
& (int) ATTR_FLAG_TYPE_IN_PLACE
)
289 TYPE_ATTRIBUTES (*anode
) = tree_cons (name
, args
, old_attrs
);
290 /* If this is the main variant, also push the attributes
291 out to the other variants. */
292 if (*anode
== TYPE_MAIN_VARIANT (*anode
))
295 for (variant
= *anode
; variant
;
296 variant
= TYPE_NEXT_VARIANT (variant
))
298 if (TYPE_ATTRIBUTES (variant
) == old_attrs
)
299 TYPE_ATTRIBUTES (variant
)
300 = TYPE_ATTRIBUTES (*anode
);
301 else if (!lookup_attribute
302 (spec
->name
, TYPE_ATTRIBUTES (variant
)))
303 TYPE_ATTRIBUTES (variant
) = tree_cons
304 (name
, args
, TYPE_ATTRIBUTES (variant
));
309 *anode
= build_type_attribute_variant (*anode
,
310 tree_cons (name
, args
,
317 /* Rebuild the function pointer type and put it in the
318 appropriate place. */
319 fn_ptr_tmp
= build_pointer_type (fn_ptr_tmp
);
321 TREE_TYPE (*node
) = fn_ptr_tmp
;
324 gcc_assert (TREE_CODE (*node
) == POINTER_TYPE
);
330 return returned_attrs
;