1/* Declarations for rtx-reader support for gen* routines.
2   Copyright (C) 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 2, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING.  If not, write to the Free
18Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
1902110-1301, USA.  */
20
21#ifndef GCC_GENSUPPORT_H
22#define GCC_GENSUPPORT_H
23
24struct obstack;
25extern struct obstack *rtl_obstack;
26extern const char *in_fname;
27
28extern int init_md_reader_args_cb (int, char **, bool (*)(const char *));
29extern int init_md_reader_args (int, char **);
30extern rtx read_md_rtx (int *, int *);
31
32extern void message_with_line (int, const char *, ...)
33     ATTRIBUTE_PRINTF_2;
34
35/* Set this to 0 to disable automatic elision of insn patterns which
36   can never be used in this configuration.  See genconditions.c.
37   Must be set before calling init_md_reader.  */
38extern int insn_elision;
39
40/* If this is 1, the insn elision table doesn't even exist yet;
41   maybe_eval_c_test will always return -1.  This is distinct from
42   insn_elision because genflags and gencodes need to see all the
43   patterns, but treat elided patterns differently.  */
44extern const int insn_elision_unavailable;
45
46/* If the C test passed as the argument can be evaluated at compile
47   time, return its truth value; else return -1.  The test must have
48   appeared somewhere in the machine description when genconditions
49   was run.  */
50extern int maybe_eval_c_test (const char *);
51
52/* This table should not be accessed directly; use maybe_eval_c_test.  */
53struct c_test
54{
55  const char *expr;
56  int value;
57};
58
59extern const struct c_test insn_conditions[];
60extern const size_t n_insn_conditions;
61
62#ifdef __HASHTAB_H__
63extern hashval_t hash_c_test (const void *);
64extern int cmp_c_test (const void *, const void *);
65#endif
66
67extern int n_comma_elts	(const char *);
68extern const char *scan_comma_elt (const char **);
69
70/* Predicate handling: helper functions and data structures.  */
71
72struct pred_data
73{
74  struct pred_data *next;	/* for iterating over the set of all preds */
75  const char *name;		/* predicate name */
76  bool special;			/* special handling of modes? */
77
78  /* data used primarily by genpreds.c */
79  const char *c_block;		/* C test block */
80  rtx exp;			/* RTL test expression */
81
82  /* data used primarily by genrecog.c */
83  enum rtx_code singleton;	/* if pred takes only one code, that code */
84  bool allows_non_lvalue;	/* if pred allows non-lvalue expressions */
85  bool allows_non_const;	/* if pred allows non-const expressions */
86  bool codes[NUM_RTX_CODE];	/* set of codes accepted */
87};
88
89extern struct pred_data *first_predicate;
90extern struct pred_data *lookup_predicate (const char *);
91extern void add_predicate (struct pred_data *);
92
93#define FOR_ALL_PREDICATES(p) for (p = first_predicate; p; p = p->next)
94
95/* This callback will be invoked whenever an rtl include directive is
96   processed.  To be used for creation of the dependency file.  */
97extern void (*include_callback) (const char *);
98
99#endif /* GCC_GENSUPPORT_H */
100