1 /* Data structure definitions for a generic GCC target.
2 Copyright (C) 2001 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the
6 Free Software Foundation; either version 2, or (at your option) any
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 In other words, you are welcome to use, share and improve this program.
19 You are forbidden to forbid anyone else to use, share and improve
20 what you give them. Help stamp out software-hoarding! */
22 /* This file contains a data structure that describes a GCC target.
23 At present, it is incomplete, but in future it should grow to
24 contain most or all target machine and target O/S specific
27 This structure has its initializer declared in target-def.h in the
28 form of large macro TARGET_INITIALIZER that expands to many smaller
31 The smaller macros each initialize one component of the structure,
32 and each has a default. Each target should have a file that
33 includes target.h and target-def.h, and overrides any inappropriate
34 defaults by undefining the relevant macro and defining a suitable
35 replacement. That file should then contain the definition of
38 struct gcc_target target = TARGET_INITIALIZER;
40 Doing things this way allows us to bring together everything that
41 defines a target to GCC. By supplying a default that is
42 appropriate to most targets, we can easily add new items without
43 needing to edit dozens of target configuration files. It should
44 also allow us to gradually reduce the amount of conditional
45 compilation that is scattered throughout GCC. */
49 /* Given two decls, merge their attributes and return the result. */
50 tree (* merge_decl_attributes
) PARAMS ((tree
, tree
));
52 /* Given two types, merge their attributes and return the result. */
53 tree (* merge_type_attributes
) PARAMS ((tree
, tree
));
55 /* Return nonzero if IDENTIFIER with arguments ARGS is a valid machine
56 specific attribute for DECL. The attributes in ATTRIBUTES have
57 previously been assigned to DECL. */
58 int (* valid_decl_attribute
) PARAMS ((tree decl
, tree attributes
,
59 tree identifier
, tree args
));
61 /* Return nonzero if IDENTIFIER with arguments ARGS is a valid machine
62 specific attribute for TYPE. The attributes in ATTRIBUTES have
63 previously been assigned to TYPE. */
64 int (* valid_type_attribute
) PARAMS ((tree type
, tree attributes
,
65 tree identifier
, tree args
));
68 extern struct gcc_target target
;