1 /* Generate code from machine description to emit insns as rtl.
2 Copyright (C) 1987, 1988, 1991 Free Software Foundation, Inc.
3
4 This file is part of GNU CC.
5
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
19
20
21 #include <stdio.h>
22 #include "hconfig.h"
23 #include "rtl.h"
24 #include "obstack.h"
25
26 static struct obstack obstack;
27 struct obstack *rtl_obstack = &obstack;
28
29 #define obstack_chunk_alloc xmalloc
30 #define obstack_chunk_free free
31
32 extern void free ();
33 extern rtx read_rtx ();
34
35 char *xmalloc ();
36 static void fatal ();
37 void fancy_abort ();
38
39 static int max_opno;
40 static int max_dup_opno;
41 static int register_constraints;
42 static int insn_code_number;
43 static int insn_index_number;
44
45 /* Data structure for recording the patterns of insns that have CLOBBERs.
46 We use this to output a function that adds these CLOBBERs to a
47 previously-allocated PARALLEL expression. */
48
49 struct clobber_pat
50 {
51 struct clobber_ent *insns;
52 rtx pattern;
53 int first_clobber;
54 struct clobber_pat *next;
55 } *clobber_list;
56
57 /* Records one insn that uses the clobber list. */
58
59 struct clobber_ent
60 {
61 int code_number; /* Counts only insns. */
62 struct clobber_ent *next;
63 };
64
65 static void
max_operand_1(x)66 max_operand_1 (x)
67 rtx x;
68 {
69 register RTX_CODE code;
70 register int i;
71 register int len;
72 register char *fmt;
73
74 if (x == 0)
75 return;
76
77 code = GET_CODE (x);
78
79 if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
80 register_constraints = 1;
81 if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
82 register_constraints = 1;
83 if (code == MATCH_OPERAND || code == MATCH_OPERATOR
84 || code == MATCH_PARALLEL)
85 max_opno = MAX (max_opno, XINT (x, 0));
86 if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
87 max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
88
89 fmt = GET_RTX_FORMAT (code);
90 len = GET_RTX_LENGTH (code);
91 for (i = 0; i < len; i++)
92 {
93 if (fmt[i] == 'e' || fmt[i] == 'u')
94 max_operand_1 (XEXP (x, i));
95 else if (fmt[i] == 'E')
96 {
97 int j;
98 for (j = 0; j < XVECLEN (x, i); j++)
99 max_operand_1 (XVECEXP (x, i, j));
100 }
101 }
102 }
103
104 static int
max_operand_vec(insn,arg)105 max_operand_vec (insn, arg)
106 rtx insn;
107 int arg;
108 {
109 register int len = XVECLEN (insn, arg);
110 register int i;
111
112 max_opno = -1;
113 max_dup_opno = -1;
114
115 for (i = 0; i < len; i++)
116 max_operand_1 (XVECEXP (insn, arg, i));
117
118 return max_opno + 1;
119 }
120
121 static void
print_code(code)122 print_code (code)
123 RTX_CODE code;
124 {
125 register char *p1;
126 for (p1 = GET_RTX_NAME (code); *p1; p1++)
127 {
128 if (*p1 >= 'a' && *p1 <= 'z')
129 putchar (*p1 + 'A' - 'a');
130 else
131 putchar (*p1);
132 }
133 }
134
135 /* Print a C expression to construct an RTX just like X,
136 substituting any operand references appearing within. */
137
138 static void
gen_exp(x)139 gen_exp (x)
140 rtx x;
141 {
142 register RTX_CODE code;
143 register int i;
144 register int len;
145 register char *fmt;
146
147 if (x == 0)
148 {
149 printf ("NULL_RTX");
150 return;
151 }
152
153 code = GET_CODE (x);
154
155 switch (code)
156 {
157 case MATCH_OPERAND:
158 case MATCH_DUP:
159 printf ("operand%d", XINT (x, 0));
160 return;
161
162 case MATCH_OP_DUP:
163 printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
164 XINT (x, 0), XINT (x, 0));
165 for (i = 0; i < XVECLEN (x, 1); i++)
166 {
167 printf (",\n\t\t");
168 gen_exp (XVECEXP (x, 1, i));
169 }
170 printf (")");
171 return;
172
173 case MATCH_OPERATOR:
174 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
175 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
176 for (i = 0; i < XVECLEN (x, 2); i++)
177 {
178 printf (",\n\t\t");
179 gen_exp (XVECEXP (x, 2, i));
180 }
181 printf (")");
182 return;
183
184 case MATCH_PARALLEL:
185 case MATCH_PAR_DUP:
186 printf ("operand%d", XINT (x, 0));
187 return;
188
189 case MATCH_SCRATCH:
190 printf ("gen_rtx (SCRATCH, %smode, 0)", GET_MODE_NAME (GET_MODE (x)));
191 return;
192
193 case ADDRESS:
194 fatal ("ADDRESS expression code used in named instruction pattern");
195
196 case PC:
197 printf ("pc_rtx");
198 return;
199
200 case CC0:
201 printf ("cc0_rtx");
202 return;
203
204 case CONST_INT:
205 if (INTVAL (x) == 0)
206 printf ("const0_rtx");
207 else if (INTVAL (x) == 1)
208 printf ("const1_rtx");
209 else if (INTVAL (x) == -1)
210 printf ("constm1_rtx");
211 else if (INTVAL (x) == STORE_FLAG_VALUE)
212 printf ("const_true_rtx");
213 else
214 printf (
215 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
216 "GEN_INT (%d)",
217 #else
218 "GEN_INT (%ld)",
219 #endif
220 INTVAL (x));
221 return;
222
223 case CONST_DOUBLE:
224 /* These shouldn't be written in MD files. Instead, the appropriate
225 routines in varasm.c should be called. */
226 abort ();
227 }
228
229 printf ("gen_rtx (");
230 print_code (code);
231 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
232
233 fmt = GET_RTX_FORMAT (code);
234 len = GET_RTX_LENGTH (code);
235 for (i = 0; i < len; i++)
236 {
237 if (fmt[i] == '0')
238 break;
239 printf (", ");
240 if (fmt[i] == 'e' || fmt[i] == 'u')
241 gen_exp (XEXP (x, i));
242 else if (fmt[i] == 'i')
243 printf ("%u", XINT (x, i));
244 else if (fmt[i] == 's')
245 printf ("\"%s\"", XSTR (x, i));
246 else if (fmt[i] == 'E')
247 {
248 int j;
249 printf ("gen_rtvec (%d", XVECLEN (x, i));
250 for (j = 0; j < XVECLEN (x, i); j++)
251 {
252 printf (",\n\t\t");
253 gen_exp (XVECEXP (x, i, j));
254 }
255 printf (")");
256 }
257 else
258 abort ();
259 }
260 printf (")");
261 }
262
263 /* Generate the `gen_...' function for a DEFINE_INSN. */
264
265 static void
gen_insn(insn)266 gen_insn (insn)
267 rtx insn;
268 {
269 int operands;
270 register int i;
271
272 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
273 registers or MATCH_SCRATCHes. If so, store away the information for
274 later. */
275
276 if (XVEC (insn, 1))
277 {
278 for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
279 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
280 || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
281 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
282 break;
283
284 if (i != XVECLEN (insn, 1) - 1)
285 {
286 register struct clobber_pat *p;
287 register struct clobber_ent *link
288 = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
289 register int j;
290
291 link->code_number = insn_code_number;
292
293 /* See if any previous CLOBBER_LIST entry is the same as this
294 one. */
295
296 for (p = clobber_list; p; p = p->next)
297 {
298 if (p->first_clobber != i + 1
299 || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
300 continue;
301
302 for (j = i + 1; j < XVECLEN (insn, 1); j++)
303 {
304 rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
305 rtx new = XEXP (XVECEXP (insn, 1, j), 0);
306
307 /* OLD and NEW are the same if both are to be a SCRATCH
308 of the same mode,
309 or if both are registers of the same mode and number. */
310 if (! (GET_MODE (old) == GET_MODE (new)
311 && ((GET_CODE (old) == MATCH_SCRATCH
312 && GET_CODE (new) == MATCH_SCRATCH)
313 || (GET_CODE (old) == REG && GET_CODE (new) == REG
314 && REGNO (old) == REGNO (new)))))
315 break;
316 }
317
318 if (j == XVECLEN (insn, 1))
319 break;
320 }
321
322 if (p == 0)
323 {
324 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
325
326 p->insns = 0;
327 p->pattern = insn;
328 p->first_clobber = i + 1;
329 p->next = clobber_list;
330 clobber_list = p;
331 }
332
333 link->next = p->insns;
334 p->insns = link;
335 }
336 }
337
338 /* Don't mention instructions whose names are the null string.
339 They are in the machine description just to be recognized. */
340 if (strlen (XSTR (insn, 0)) == 0)
341 return;
342
343 /* Find out how many operands this function has,
344 and also whether any of them have register constraints. */
345 register_constraints = 0;
346 operands = max_operand_vec (insn, 1);
347 if (max_dup_opno >= operands)
348 fatal ("match_dup operand number has no match_operand");
349
350 /* Output the function name and argument declarations. */
351 printf ("rtx\ngen_%s (", XSTR (insn, 0));
352 for (i = 0; i < operands; i++)
353 printf (i ? ", operand%d" : "operand%d", i);
354 printf (")\n");
355 for (i = 0; i < operands; i++)
356 printf (" rtx operand%d;\n", i);
357 printf ("{\n");
358
359 /* Output code to construct and return the rtl for the instruction body */
360
361 if (XVECLEN (insn, 1) == 1)
362 {
363 printf (" return ");
364 gen_exp (XVECEXP (insn, 1, 0));
365 printf (";\n}\n\n");
366 }
367 else
368 {
369 printf (" return gen_rtx (PARALLEL, VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
370 for (i = 0; i < XVECLEN (insn, 1); i++)
371 {
372 printf (",\n\t\t");
373 gen_exp (XVECEXP (insn, 1, i));
374 }
375 printf ("));\n}\n\n");
376 }
377 }
378
379 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
380
381 static void
gen_expand(expand)382 gen_expand (expand)
383 rtx expand;
384 {
385 int operands;
386 register int i;
387
388 if (strlen (XSTR (expand, 0)) == 0)
389 fatal ("define_expand lacks a name");
390 if (XVEC (expand, 1) == 0)
391 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
392
393 /* Find out how many operands this function has,
394 and also whether any of them have register constraints. */
395 register_constraints = 0;
396
397 operands = max_operand_vec (expand, 1);
398
399 /* Output the function name and argument declarations. */
400 printf ("rtx\ngen_%s (", XSTR (expand, 0));
401 for (i = 0; i < operands; i++)
402 printf (i ? ", operand%d" : "operand%d", i);
403 printf (")\n");
404 for (i = 0; i < operands; i++)
405 printf (" rtx operand%d;\n", i);
406 printf ("{\n");
407
408 /* If we don't have any C code to write, only one insn is being written,
409 and no MATCH_DUPs are present, we can just return the desired insn
410 like we do for a DEFINE_INSN. This saves memory. */
411 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
412 && operands > max_dup_opno
413 && XVECLEN (expand, 1) == 1)
414 {
415 printf (" return ");
416 gen_exp (XVECEXP (expand, 1, 0));
417 printf (";\n}\n\n");
418 return;
419 }
420
421 /* For each operand referred to only with MATCH_DUPs,
422 make a local variable. */
423 for (i = operands; i <= max_dup_opno; i++)
424 printf (" rtx operand%d;\n", i);
425 if (operands > 0 || max_dup_opno >= 0)
426 printf (" rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
427 printf (" rtx _val = 0;\n");
428 printf (" start_sequence ();\n");
429
430 /* The fourth operand of DEFINE_EXPAND is some code to be executed
431 before the actual construction.
432 This code expects to refer to `operands'
433 just as the output-code in a DEFINE_INSN does,
434 but here `operands' is an automatic array.
435 So copy the operand values there before executing it. */
436 if (XSTR (expand, 3) && *XSTR (expand, 3))
437 {
438 /* Output code to copy the arguments into `operands'. */
439 for (i = 0; i < operands; i++)
440 printf (" operands[%d] = operand%d;\n", i, i);
441
442 /* Output the special code to be executed before the sequence
443 is generated. */
444 printf ("%s\n", XSTR (expand, 3));
445
446 /* Output code to copy the arguments back out of `operands'
447 (unless we aren't going to use them at all). */
448 if (XVEC (expand, 1) != 0)
449 {
450 for (i = 0; i < operands; i++)
451 printf (" operand%d = operands[%d];\n", i, i);
452 for (; i <= max_dup_opno; i++)
453 printf (" operand%d = operands[%d];\n", i, i);
454 }
455 }
456
457 /* Output code to construct the rtl for the instruction bodies.
458 Use emit_insn to add them to the sequence being accumulated.
459 But don't do this if the user's code has set `no_more' nonzero. */
460
461 for (i = 0; i < XVECLEN (expand, 1); i++)
462 {
463 rtx next = XVECEXP (expand, 1, i);
464 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
465 || (GET_CODE (next) == PARALLEL
466 && GET_CODE (XVECEXP (next, 0, 0)) == SET
467 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
468 || GET_CODE (next) == RETURN)
469 printf (" emit_jump_insn (");
470 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
471 || GET_CODE (next) == CALL
472 || (GET_CODE (next) == PARALLEL
473 && GET_CODE (XVECEXP (next, 0, 0)) == SET
474 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
475 || (GET_CODE (next) == PARALLEL
476 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
477 printf (" emit_call_insn (");
478 else if (GET_CODE (next) == CODE_LABEL)
479 printf (" emit_label (");
480 else if (GET_CODE (next) == MATCH_OPERAND
481 || GET_CODE (next) == MATCH_OPERATOR
482 || GET_CODE (next) == MATCH_PARALLEL
483 || GET_CODE (next) == MATCH_OP_DUP
484 || GET_CODE (next) == MATCH_DUP
485 || GET_CODE (next) == PARALLEL)
486 printf (" emit (");
487 else
488 printf (" emit_insn (");
489 gen_exp (next);
490 printf (");\n");
491 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
492 && GET_CODE (SET_SRC (next)) == LABEL_REF)
493 printf (" emit_barrier ();");
494 }
495
496 /* Call `gen_sequence' to make a SEQUENCE out of all the
497 insns emitted within this gen_... function. */
498
499 printf (" _done:\n");
500 printf (" _val = gen_sequence ();\n");
501 printf (" _fail:\n");
502 printf (" end_sequence ();\n");
503 printf (" return _val;\n}\n\n");
504 }
505
506 /* Like gen_expand, but generates a SEQUENCE. */
507 static void
gen_split(split)508 gen_split (split)
509 rtx split;
510 {
511 register int i;
512 int operands;
513
514 if (XVEC (split, 0) == 0)
515 fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
516 else if (XVEC (split, 2) == 0)
517 fatal ("define_split (definition %d) lacks a replacement pattern",
518 insn_index_number);
519
520 /* Find out how many operands this function has. */
521
522 max_operand_vec (split, 2);
523 operands = MAX (max_opno, max_dup_opno) + 1;
524
525 /* Output the function name and argument declarations. */
526 printf ("rtx\ngen_split_%d (operands)\n rtx *operands;\n",
527 insn_code_number);
528 printf ("{\n");
529
530 /* Declare all local variables. */
531 for (i = 0; i < operands; i++)
532 printf (" rtx operand%d;\n", i);
533 printf (" rtx _val = 0;\n");
534 printf (" start_sequence ();\n");
535
536 /* The fourth operand of DEFINE_SPLIT is some code to be executed
537 before the actual construction. */
538
539 if (XSTR (split, 3))
540 printf ("%s\n", XSTR (split, 3));
541
542 /* Output code to copy the arguments back out of `operands' */
543 for (i = 0; i < operands; i++)
544 printf (" operand%d = operands[%d];\n", i, i);
545
546 /* Output code to construct the rtl for the instruction bodies.
547 Use emit_insn to add them to the sequence being accumulated.
548 But don't do this if the user's code has set `no_more' nonzero. */
549
550 for (i = 0; i < XVECLEN (split, 2); i++)
551 {
552 rtx next = XVECEXP (split, 2, i);
553 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
554 || (GET_CODE (next) == PARALLEL
555 && GET_CODE (XVECEXP (next, 0, 0)) == SET
556 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
557 || GET_CODE (next) == RETURN)
558 printf (" emit_jump_insn (");
559 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
560 || GET_CODE (next) == CALL
561 || (GET_CODE (next) == PARALLEL
562 && GET_CODE (XVECEXP (next, 0, 0)) == SET
563 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
564 || (GET_CODE (next) == PARALLEL
565 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
566 printf (" emit_call_insn (");
567 else if (GET_CODE (next) == CODE_LABEL)
568 printf (" emit_label (");
569 else if (GET_CODE (next) == MATCH_OPERAND
570 || GET_CODE (next) == MATCH_OPERATOR
571 || GET_CODE (next) == MATCH_PARALLEL
572 || GET_CODE (next) == MATCH_OP_DUP
573 || GET_CODE (next) == MATCH_DUP
574 || GET_CODE (next) == PARALLEL)
575 printf (" emit (");
576 else
577 printf (" emit_insn (");
578 gen_exp (next);
579 printf (");\n");
580 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
581 && GET_CODE (SET_SRC (next)) == LABEL_REF)
582 printf (" emit_barrier ();");
583 }
584
585 /* Call `gen_sequence' to make a SEQUENCE out of all the
586 insns emitted within this gen_... function. */
587
588 printf (" _done:\n");
589 printf (" _val = gen_sequence ();\n");
590 printf (" _fail:\n");
591 printf (" end_sequence ();\n");
592 printf (" return _val;\n}\n\n");
593 }
594
595 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
596 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
597 the end of the vector. */
598
599 static void
output_add_clobbers()600 output_add_clobbers ()
601 {
602 struct clobber_pat *clobber;
603 struct clobber_ent *ent;
604 int i;
605
606 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
607 printf (" rtx pattern;\n int insn_code_number;\n");
608 printf ("{\n");
609 printf (" int i;\n\n");
610 printf (" switch (insn_code_number)\n");
611 printf (" {\n");
612
613 for (clobber = clobber_list; clobber; clobber = clobber->next)
614 {
615 for (ent = clobber->insns; ent; ent = ent->next)
616 printf (" case %d:\n", ent->code_number);
617
618 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
619 {
620 printf (" XVECEXP (pattern, 0, %d) = ", i);
621 gen_exp (XVECEXP (clobber->pattern, 1, i));
622 printf (";\n");
623 }
624
625 printf (" break;\n\n");
626 }
627
628 printf (" default:\n");
629 printf (" abort ();\n");
630 printf (" }\n");
631 printf ("}\n");
632 }
633
634 /* Write a function, init_mov_optab, that is called to set up entries
635 in mov_optab for EXTRA_CC_MODES. */
636
637 static void
output_init_mov_optab()638 output_init_mov_optab ()
639 {
640 #ifdef EXTRA_CC_NAMES
641 static char *cc_names[] = { EXTRA_CC_NAMES };
642 char *p;
643 int i;
644
645 printf ("\nvoid\ninit_mov_optab ()\n{\n");
646
647 for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
648 {
649 printf ("#ifdef HAVE_mov");
650 for (p = cc_names[i]; *p; p++)
651 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
652 printf ("\n");
653 printf (" if (HAVE_mov");
654 for (p = cc_names[i]; *p; p++)
655 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
656 printf (")\n");
657 printf (" mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
658 cc_names[i]);
659 for (p = cc_names[i]; *p; p++)
660 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
661 printf (";\n#endif\n");
662 }
663
664 printf ("}\n");
665 #endif
666 }
667
668 char *
xmalloc(size)669 xmalloc (size)
670 unsigned size;
671 {
672 register char *val = (char *) malloc (size);
673
674 if (val == 0)
675 fatal ("virtual memory exhausted");
676
677 return val;
678 }
679
680 char *
xrealloc(ptr,size)681 xrealloc (ptr, size)
682 char *ptr;
683 unsigned size;
684 {
685 char *result = (char *) realloc (ptr, size);
686 if (!result)
687 fatal ("virtual memory exhausted");
688 return result;
689 }
690
691 static void
fatal(s,a1,a2)692 fatal (s, a1, a2)
693 char *s;
694 {
695 fprintf (stderr, "genemit: ");
696 fprintf (stderr, s, a1, a2);
697 fprintf (stderr, "\n");
698 exit (FATAL_EXIT_CODE);
699 }
700
701 /* More 'friendly' abort that prints the line and file.
702 config.h can #define abort fancy_abort if you like that sort of thing. */
703
704 void
fancy_abort()705 fancy_abort ()
706 {
707 fatal ("Internal gcc abort.");
708 }
709
710 int
main(argc,argv)711 main (argc, argv)
712 int argc;
713 char **argv;
714 {
715 rtx desc;
716 FILE *infile;
717 register int c;
718
719 obstack_init (rtl_obstack);
720
721 if (argc <= 1)
722 fatal ("No input file name.");
723
724 infile = fopen (argv[1], "r");
725 if (infile == 0)
726 {
727 perror (argv[1]);
728 exit (FATAL_EXIT_CODE);
729 }
730
731 init_rtl ();
732
733 /* Assign sequential codes to all entries in the machine description
734 in parallel with the tables in insn-output.c. */
735
736 insn_code_number = 0;
737 insn_index_number = 0;
738
739 printf ("/* Generated automatically by the program `genemit'\n\
740 from the machine description file `md'. */\n\n");
741
742 printf ("#include \"config.h\"\n");
743 printf ("#include \"rtl.h\"\n");
744 printf ("#include \"expr.h\"\n");
745 printf ("#include \"real.h\"\n");
746 printf ("#include \"output.h\"\n");
747 printf ("#include \"insn-config.h\"\n\n");
748 printf ("#include \"insn-flags.h\"\n\n");
749 printf ("#include \"insn-codes.h\"\n\n");
750 printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
751 printf ("extern rtx recog_operand[];\n");
752 printf ("#define operands emit_operand\n\n");
753 printf ("#define FAIL goto _fail\n\n");
754 printf ("#define DONE goto _done\n\n");
755
756 /* Read the machine description. */
757
758 while (1)
759 {
760 c = read_skip_spaces (infile);
761 if (c == EOF)
762 break;
763 ungetc (c, infile);
764
765 desc = read_rtx (infile);
766 if (GET_CODE (desc) == DEFINE_INSN)
767 {
768 gen_insn (desc);
769 ++insn_code_number;
770 }
771 if (GET_CODE (desc) == DEFINE_EXPAND)
772 {
773 gen_expand (desc);
774 ++insn_code_number;
775 }
776 if (GET_CODE (desc) == DEFINE_SPLIT)
777 {
778 gen_split (desc);
779 ++insn_code_number;
780 }
781 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
782 {
783 ++insn_code_number;
784 }
785 ++insn_index_number;
786 }
787
788 /* Write out the routine to add CLOBBERs to a pattern. */
789 output_add_clobbers ();
790
791 /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES. */
792 output_init_mov_optab ();
793
794 fflush (stdout);
795 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
796 /* NOTREACHED */
797 return 0;
798 }
799