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);