1 /* Generate from machine description:
2
3 - some #define configuration flags.
4 Copyright (C) 1987, 1991 Free Software Foundation, Inc.
5
6 This file is part of GNU CC.
7
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)
11 any later version.
12
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.
17
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. */
21
22
23 #include <stdio.h>
24 #include "hconfig.h"
25 #include "rtl.h"
26 #include "obstack.h"
27
28 static struct obstack obstack;
29 struct obstack *rtl_obstack = &obstack;
30
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
33
34 extern void free ();
35 extern rtx read_rtx ();
36
37 /* flags to determine output of machine description dependent #define's. */
38 static int max_recog_operands; /* Largest operand number seen. */
39 static int max_dup_operands; /* Largest number of match_dup in any insn. */
40 static int max_clobbers_per_insn;
41 static int register_constraint_flag;
42 static int have_cc0_flag;
43 static int have_cmove_flag;
44 static int have_lo_sum_flag;
45
46 /* Maximum number of insns seen in a split. */
47 static int max_insns_per_split = 1;
48
49 static int clobbers_seen_this_insn;
50 static int dup_operands_seen_this_insn;
51
52 char *xmalloc ();
53 static void fatal ();
54 void fancy_abort ();
55
56 /* RECOG_P will be non-zero if this pattern was seen in a context where it will
57 be used to recognize, rather than just generate an insn.
58
59 NON_PC_SET_SRC will be non-zero if this pattern was seen in a SET_SRC
60 of a SET whose destination is not (pc). */
61
62 static void
walk_insn_part(part,recog_p,non_pc_set_src)63 walk_insn_part (part, recog_p, non_pc_set_src)
64 rtx part;
65 int recog_p;
66 int non_pc_set_src;
67 {
68 register int i, j;
69 register RTX_CODE code;
70 register char *format_ptr;
71
72 if (part == 0)
73 return;
74
75 code = GET_CODE (part);
76 switch (code)
77 {
78 case CLOBBER:
79 clobbers_seen_this_insn++;
80 break;
81
82 case MATCH_OPERAND:
83 if (XINT (part, 0) > max_recog_operands)
84 max_recog_operands = XINT (part, 0);
85 if (XSTR (part, 2) && *XSTR (part, 2))
86 register_constraint_flag = 1;
87 return;
88
89 case MATCH_OP_DUP:
90 case MATCH_PAR_DUP:
91 ++dup_operands_seen_this_insn;
92 case MATCH_SCRATCH:
93 case MATCH_PARALLEL:
94 case MATCH_OPERATOR:
95 if (XINT (part, 0) > max_recog_operands)
96 max_recog_operands = XINT (part, 0);
97 /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
98 MATCH_PARALLEL. */
99 break;
100
101 case LABEL_REF:
102 if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND)
103 break;
104 return;
105
106 case MATCH_DUP:
107 ++dup_operands_seen_this_insn;
108 if (XINT (part, 0) > max_recog_operands)
109 max_recog_operands = XINT (part, 0);
110 return;
111
112 case CC0:
113 if (recog_p)
114 have_cc0_flag = 1;
115 return;
116
117 case LO_SUM:
118 if (recog_p)
119 have_lo_sum_flag = 1;
120 return;
121
122 case SET:
123 walk_insn_part (SET_DEST (part), 0, recog_p);
124 walk_insn_part (SET_SRC (part), recog_p,
125 GET_CODE (SET_DEST (part)) != PC);
126 return;
127
128 case IF_THEN_ELSE:
129 /* Only consider this machine as having a conditional move if the
130 two arms of the IF_THEN_ELSE are both MATCH_OPERAND. Otherwise,
131 we have some specific IF_THEN_ELSE construct (like the doz
132 instruction on the RS/6000) that can't be used in the general
133 context we want it for. */
134
135 if (recog_p && non_pc_set_src
136 && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
137 && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
138 have_cmove_flag = 1;
139 break;
140
141 case REG: case CONST_INT: case SYMBOL_REF:
142 case PC:
143 return;
144 }
145
146 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
147
148 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
149 switch (*format_ptr++)
150 {
151 case 'e':
152 case 'u':
153 walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
154 break;
155 case 'E':
156 if (XVEC (part, i) != NULL)
157 for (j = 0; j < XVECLEN (part, i); j++)
158 walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
159 break;
160 }
161 }
162
163 static void
gen_insn(insn)164 gen_insn (insn)
165 rtx insn;
166 {
167 int i;
168
169 /* Walk the insn pattern to gather the #define's status. */
170 clobbers_seen_this_insn = 0;
171 dup_operands_seen_this_insn = 0;
172 if (XVEC (insn, 1) != 0)
173 for (i = 0; i < XVECLEN (insn, 1); i++)
174 walk_insn_part (XVECEXP (insn, 1, i), 1, 0);
175
176 if (clobbers_seen_this_insn > max_clobbers_per_insn)
177 max_clobbers_per_insn = clobbers_seen_this_insn;
178 if (dup_operands_seen_this_insn > max_dup_operands)
179 max_dup_operands = dup_operands_seen_this_insn;
180 }
181
182 /* Similar but scan a define_expand. */
183
184 static void
gen_expand(insn)185 gen_expand (insn)
186 rtx insn;
187 {
188 int i;
189
190 /* Walk the insn pattern to gather the #define's status. */
191
192 /* Note that we don't bother recording the number of MATCH_DUPs
193 that occur in a gen_expand, because only reload cares about that. */
194 if (XVEC (insn, 1) != 0)
195 for (i = 0; i < XVECLEN (insn, 1); i++)
196 {
197 /* Compute the maximum SETs and CLOBBERS
198 in any one of the sub-insns;
199 don't sum across all of them. */
200 clobbers_seen_this_insn = 0;
201
202 walk_insn_part (XVECEXP (insn, 1, i), 0, 0);
203
204 if (clobbers_seen_this_insn > max_clobbers_per_insn)
205 max_clobbers_per_insn = clobbers_seen_this_insn;
206 }
207 }
208
209 /* Similar but scan a define_split. */
210
211 static void
gen_split(split)212 gen_split (split)
213 rtx split;
214 {
215 int i;
216
217 /* Look through the patterns that are matched
218 to compute the maximum operand number. */
219 for (i = 0; i < XVECLEN (split, 0); i++)
220 walk_insn_part (XVECEXP (split, 0, i), 1, 0);
221 /* Look at the number of insns this insn could split into. */
222 if (XVECLEN (split, 2) > max_insns_per_split)
223 max_insns_per_split = XVECLEN (split, 2);
224 }
225
226 static void
gen_peephole(peep)227 gen_peephole (peep)
228 rtx peep;
229 {
230 int i;
231
232 /* Look through the patterns that are matched
233 to compute the maximum operand number. */
234 for (i = 0; i < XVECLEN (peep, 0); i++)
235 walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
236 }
237
238 char *
xmalloc(size)239 xmalloc (size)
240 unsigned size;
241 {
242 register char *val = (char *) malloc (size);
243
244 if (val == 0)
245 fatal ("virtual memory exhausted");
246
247 return val;
248 }
249
250 char *
xrealloc(ptr,size)251 xrealloc (ptr, size)
252 char *ptr;
253 unsigned size;
254 {
255 char *result = (char *) realloc (ptr, size);
256 if (!result)
257 fatal ("virtual memory exhausted");
258 return result;
259 }
260
261 static void
fatal(s,a1,a2)262 fatal (s, a1, a2)
263 char *s;
264 {
265 fprintf (stderr, "genconfig: ");
266 fprintf (stderr, s, a1, a2);
267 fprintf (stderr, "\n");
268 exit (FATAL_EXIT_CODE);
269 }
270
271 /* More 'friendly' abort that prints the line and file.
272 config.h can #define abort fancy_abort if you like that sort of thing. */
273
274 void
fancy_abort()275 fancy_abort ()
276 {
277 fatal ("Internal gcc abort.");
278 }
279
280 int
main(argc,argv)281 main (argc, argv)
282 int argc;
283 char **argv;
284 {
285 rtx desc;
286 FILE *infile;
287 register int c;
288
289 obstack_init (rtl_obstack);
290
291 if (argc <= 1)
292 fatal ("No input file name.");
293
294 infile = fopen (argv[1], "r");
295 if (infile == 0)
296 {
297 perror (argv[1]);
298 exit (FATAL_EXIT_CODE);
299 }
300
301 init_rtl ();
302
303 printf ("/* Generated automatically by the program `genconfig'\n\
304 from the machine description file `md'. */\n\n");
305
306 /* Allow at least 10 operands for the sake of asm constructs. */
307 max_recog_operands = 9; /* We will add 1 later. */
308 max_dup_operands = 1;
309
310 /* Read the machine description. */
311
312 while (1)
313 {
314 c = read_skip_spaces (infile);
315 if (c == EOF)
316 break;
317 ungetc (c, infile);
318
319 desc = read_rtx (infile);
320 if (GET_CODE (desc) == DEFINE_INSN)
321 gen_insn (desc);
322 if (GET_CODE (desc) == DEFINE_EXPAND)
323 gen_expand (desc);
324 if (GET_CODE (desc) == DEFINE_SPLIT)
325 gen_split (desc);
326 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
327 gen_peephole (desc);
328 }
329
330 printf ("\n#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
331
332 printf ("\n#define MAX_DUP_OPERANDS %d\n", max_dup_operands);
333
334 /* This is conditionally defined, in case the user writes code which emits
335 more splits than we can readily see (and knows s/he does it). */
336 printf ("#ifndef MAX_INSNS_PER_SPLIT\n#define MAX_INSNS_PER_SPLIT %d\n#endif\n",
337 max_insns_per_split);
338
339 if (register_constraint_flag)
340 printf ("#define REGISTER_CONSTRAINTS\n");
341
342 if (have_cc0_flag)
343 printf ("#define HAVE_cc0\n");
344
345 if (have_cmove_flag)
346 printf ("#define HAVE_conditional_move\n");
347
348 if (have_lo_sum_flag)
349 printf ("#define HAVE_lo_sum\n");
350
351 fflush (stdout);
352 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
353 /* NOTREACHED */
354 return 0;
355 }
356