1 /* Generate from machine description:
3 - some #define configuration flags.
4 Copyright (C) 1987 Free Software Foundation, Inc.
6 This file is part of GNU CC.
8 GNU CC is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GNU CC is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GNU CC; see the file COPYING. If not, write to
20 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
28 static struct obstack obstack
;
29 struct obstack
*rtl_obstack
= &obstack
;
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
36 /* flags to determine output of machine description dependent #define's. */
37 static int max_recog_operands
;
38 static int max_dup_operands
;
39 static int max_clobbers_per_insn
;
40 static int register_constraint_flag
;
41 static int have_cc0_flag
;
42 static int have_lo_sum_flag
;
44 /* Maximum number of insns seen in a split. */
45 static int max_insns_per_split
= 1;
47 static int clobbers_seen_this_insn
;
48 static int dup_operands_seen_this_insn
;
54 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
55 be used to recognize, rather than just generate an insn. */
58 walk_insn_part (part
, recog_p
)
62 register RTX_CODE code
;
63 register char *format_ptr
;
68 code
= GET_CODE (part
);
72 clobbers_seen_this_insn
++;
76 if (XINT (part
, 0) > max_recog_operands
)
77 max_recog_operands
= XINT (part
, 0);
78 if (XSTR (part
, 2) && *XSTR (part
, 2))
79 register_constraint_flag
= 1;
83 ++dup_operands_seen_this_insn
;
87 if (XINT (part
, 0) > max_recog_operands
)
88 max_recog_operands
= XINT (part
, 0);
89 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
94 if (GET_CODE (XEXP (part
, 0)) == MATCH_OPERAND
)
99 ++dup_operands_seen_this_insn
;
100 if (XINT (part
, 0) > max_recog_operands
)
101 max_recog_operands
= XINT (part
, 0);
111 have_lo_sum_flag
= 1;
114 case REG
: case CONST_INT
: case SYMBOL_REF
:
119 format_ptr
= GET_RTX_FORMAT (GET_CODE (part
));
121 for (i
= 0; i
< GET_RTX_LENGTH (GET_CODE (part
)); i
++)
122 switch (*format_ptr
++)
126 walk_insn_part (XEXP (part
, i
), recog_p
);
129 if (XVEC (part
, i
) != NULL
)
130 for (j
= 0; j
< XVECLEN (part
, i
); j
++)
131 walk_insn_part (XVECEXP (part
, i
, j
), recog_p
);
142 /* Walk the insn pattern to gather the #define's status. */
143 clobbers_seen_this_insn
= 0;
144 dup_operands_seen_this_insn
= 0;
145 if (XVEC (insn
, 1) != 0)
146 for (i
= 0; i
< XVECLEN (insn
, 1); i
++)
147 walk_insn_part (XVECEXP (insn
, 1, i
), 1);
149 if (clobbers_seen_this_insn
> max_clobbers_per_insn
)
150 max_clobbers_per_insn
= clobbers_seen_this_insn
;
151 if (dup_operands_seen_this_insn
> max_dup_operands
)
152 max_dup_operands
= dup_operands_seen_this_insn
;
155 /* Similar but scan a define_expand. */
163 /* Walk the insn pattern to gather the #define's status. */
165 /* Note that we don't bother recording the number of MATCH_DUPs
166 that occur in a gen_expand, because only reload cares about that. */
167 if (XVEC (insn
, 1) != 0)
168 for (i
= 0; i
< XVECLEN (insn
, 1); i
++)
170 /* Compute the maximum SETs and CLOBBERS
171 in any one of the sub-insns;
172 don't sum across all of them. */
173 clobbers_seen_this_insn
= 0;
175 walk_insn_part (XVECEXP (insn
, 1, i
), 0);
177 if (clobbers_seen_this_insn
> max_clobbers_per_insn
)
178 max_clobbers_per_insn
= clobbers_seen_this_insn
;
182 /* Similar but scan a define_split. */
190 /* Look through the patterns that are matched
191 to compute the maximum operand number. */
192 for (i
= 0; i
< XVECLEN (split
, 0); i
++)
193 walk_insn_part (XVECEXP (split
, 0, i
), 1);
194 /* Look at the number of insns this insn could split into. */
195 if (XVECLEN (split
, 2) > max_insns_per_split
)
196 max_insns_per_split
= XVECLEN (split
, 2);
205 /* Look through the patterns that are matched
206 to compute the maximum operand number. */
207 for (i
= 0; i
< XVECLEN (peep
, 0); i
++)
208 walk_insn_part (XVECEXP (peep
, 0, i
), 1);
215 register char *val
= (char *) malloc (size
);
218 fatal ("virtual memory exhausted");
228 char *result
= (char *) realloc (ptr
, size
);
230 fatal ("virtual memory exhausted");
238 fprintf (stderr
, "genconfig: ");
239 fprintf (stderr
, s
, a1
, a2
);
240 fprintf (stderr
, "\n");
241 exit (FATAL_EXIT_CODE
);
244 /* More 'friendly' abort that prints the line and file.
245 config.h can #define abort fancy_abort if you like that sort of thing. */
250 fatal ("Internal gcc abort.");
260 extern rtx
read_rtx ();
263 obstack_init (rtl_obstack
);
266 fatal ("No input file name.");
268 infile
= fopen (argv
[1], "r");
272 exit (FATAL_EXIT_CODE
);
277 printf ("/* Generated automatically by the program `genconfig'\n\
278 from the machine description file `md'. */\n\n");
280 /* Allow at least 10 operands for the sake of asm constructs. */
281 max_recog_operands
= 10;
282 max_dup_operands
= 1;
284 /* Read the machine description. */
288 c
= read_skip_spaces (infile
);
293 desc
= read_rtx (infile
);
294 if (GET_CODE (desc
) == DEFINE_INSN
)
296 if (GET_CODE (desc
) == DEFINE_EXPAND
)
298 if (GET_CODE (desc
) == DEFINE_SPLIT
)
300 if (GET_CODE (desc
) == DEFINE_PEEPHOLE
)
304 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands
);
306 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands
);
308 /* This is conditionally defined, in case the user writes code which emits
309 more splits than we can readily see (and knows s/he does it). */
310 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
311 max_insns_per_split
);
313 if (register_constraint_flag
)
314 printf ("#define REGISTER_CONSTRAINTS\n");
317 printf ("#define HAVE_cc0\n");
319 if (have_lo_sum_flag
)
320 printf ("#define HAVE_lo_sum\n");
323 exit (ferror (stdout
) != 0 ? FATAL_EXIT_CODE
: SUCCESS_EXIT_CODE
);