1 /* Generate code from to output assembler insns as recognized from rtl.
2 Copyright (C) 1987, 88, 92, 94-95, 97-98, 1999
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 /* This program reads the machine description for the compiler target machine
24 and produces a file containing these things:
26 1. An array of `struct insn_data', which is indexed by insn code number,
29 a. `name' is the name for that pattern. Nameless patterns are
32 b. `output' hold either the output template, an array of output
33 templates, or an output function.
35 c. `genfun' is the function to generate a body for that pattern,
36 given operands as arguments.
38 d. `n_operands' is the number of distinct operands in the pattern
41 e. `n_dups' is the number of match_dup's that appear in the insn's
42 pattern. This says how many elements of `recog_data.dup_loc' are
43 significant after an insn has been recognized.
45 f. `n_alternatives' is the number of alternatives in the constraints
48 g. `output_format' tells what type of thing `output' is.
50 h. `operand' is the base of an array of operand data for the insn.
52 2. An array of `struct insn_operand data', used by `operand' above.
54 a. `predicate', an int-valued function, is the match_operand predicate
57 b. `constraint' is the constraint for this operand. This exists
58 only if register constraints appear in match_operand rtx's.
60 c. `address_p' indicates that the operand appears within ADDRESS
61 rtx's. This exists only if there are *no* register constraints
62 in the match_operand rtx's.
64 d. `mode' is the machine mode that that operand is supposed to have.
66 e. `strict_low', is nonzero for operands contained in a STRICT_LOW_PART.
68 The code number of an insn is simply its position in the machine
69 description; code numbers are assigned sequentially to entries in
70 the description, starting with code number 0.
72 Thus, the following entry in the machine description
75 [(set (match_operand:DF 0 "general_operand" "")
80 assuming it is the 25th entry present, would cause
81 insn_data[24].template to be "clrd %0", and
82 insn_data[24].n_operands to be 1. */
90 /* No instruction can have more operands than this. Sorry for this
91 arbitrary limit, but what machine will have an instruction with
92 this many operands? */
94 #define MAX_MAX_OPERANDS 40
96 static struct obstack obstack;
97 struct obstack *rtl_obstack = &obstack;
99 #define obstack_chunk_alloc xmalloc
100 #define obstack_chunk_free free
102 static int n_occurrences PROTO((int, char *));
104 /* insns in the machine description are assigned sequential code numbers
105 that are used by insn-recog.c (produced by genrecog) to communicate
106 to insn-output.c (produced by this program). */
108 static int next_code_number;
110 /* This counts all definitions in the md file,
111 for the sake of error messages. */
113 static int next_index_number;
115 /* This counts all operands used in the md file. The first is null. */
117 static int next_operand_number = 1;
119 /* Record in this chain all information about the operands we will output. */
123 struct operand_data *next;
125 const char *predicate;
126 const char *constraint;
127 enum machine_mode mode;
128 unsigned char n_alternatives;
134 /* Begin with a null operand at index 0. */
136 static struct operand_data null_operand =
138 0, 0, "", "", VOIDmode, 0, 0, 0, 0
141 static struct operand_data *odata = &null_operand;
142 static struct operand_data **odata_end = &null_operand.next;
144 /* Must match the constants in recog.h. */
146 #define INSN_OUTPUT_FORMAT_NONE 0 /* abort */
147 #define INSN_OUTPUT_FORMAT_SINGLE 1 /* const char * */
148 #define INSN_OUTPUT_FORMAT_MULTI 2 /* const char * const * */
149 #define INSN_OUTPUT_FORMAT_FUNCTION 3 /* const char * (*)(...) */
151 /* Record in this chain all information that we will output,
152 associated with the code number of the insn. */
158 const char *template;
161 int n_operands; /* Number of operands this insn recognizes */
162 int n_dups; /* Number times match_dup appears in pattern */
163 int n_alternatives; /* Number of alternatives in each constraint */
164 int operand_number; /* Operand index in the big array. */
165 int output_format; /* INSN_OUTPUT_FORMAT_*. */
166 struct operand_data operand[MAX_MAX_OPERANDS];
169 /* This variable points to the first link in the insn chain. */
171 static struct data *idata, **idata_end = &idata;
173 /* Nonzero if any match_operand has a constraint string; implies that
174 REGISTER_CONSTRAINTS will be defined for this machine description. */
176 static int have_constraints;
179 static void output_prologue PROTO((void));
180 static void output_predicate_decls PROTO((void));
181 static void output_operand_data PROTO((void));
182 static void output_insn_data PROTO((void));
183 static void output_get_insn_name PROTO((void));
184 static void scan_operands PROTO((struct data *, rtx, int, int));
185 static int compare_operands PROTO((struct operand_data *,
186 struct operand_data *));
187 static void place_operands PROTO((struct data *));
188 static void process_template PROTO((struct data *, char *));
189 static void validate_insn_alternatives PROTO((struct data *));
190 static void gen_insn PROTO((rtx));
191 static void gen_peephole PROTO((rtx));
192 static void gen_expand PROTO((rtx));
193 static void gen_split PROTO((rtx));
194 static int n_occurrences PROTO((int, char *));
197 get_insn_name (index)
200 static char buf[100];
202 struct data *i, *last_named = NULL;
203 for (i = idata; i ; i = i->next)
205 if (i->index_number == index)
212 sprintf(buf, "%s+%d", last_named->name, index - last_named->index_number);
214 sprintf(buf, "insn %d", index);
222 printf ("/* Generated automatically by the program `genoutput'\n\
223 from the machine description file `md'. */\n\n");
225 printf ("#define NO_MD_PROTOTYPES\n");
226 printf ("#include \"config.h\"\n");
227 printf ("#include \"system.h\"\n");
228 printf ("#include \"flags.h\"\n");
229 printf ("#include \"rtl.h\"\n");
230 printf ("#include \"tm_p.h\"\n");
231 printf ("#include \"function.h\"\n");
232 printf ("#include \"regs.h\"\n");
233 printf ("#include \"hard-reg-set.h\"\n");
234 printf ("#include \"real.h\"\n");
235 printf ("#include \"insn-config.h\"\n\n");
236 printf ("#include \"conditions.h\"\n");
237 printf ("#include \"insn-flags.h\"\n");
238 printf ("#include \"insn-attr.h\"\n\n");
239 printf ("#include \"insn-codes.h\"\n\n");
240 printf ("#include \"recog.h\"\n\n");
242 printf ("#include \"output.h\"\n");
246 /* We need to define all predicates used. Keep a list of those we
247 have defined so far. There normally aren't very many predicates
248 used, so a linked list should be fast enough. */
251 output_predicate_decls ()
253 struct predicate { const char *name; struct predicate *next; } *predicates = 0;
254 register struct operand_data *d;
257 for (d = odata; d; d = d->next)
258 if (d->predicate && d->predicate[0])
260 for (p = predicates; p; p = p->next)
261 if (strcmp (p->name, d->predicate) == 0)
266 printf ("extern int %s PROTO ((rtx, enum machine_mode));\n",
268 p = (struct predicate *) alloca (sizeof (struct predicate));
269 p->name = d->predicate;
270 p->next = predicates;
279 output_operand_data ()
281 register struct operand_data *d;
283 printf ("\nstatic const struct insn_operand_data operand_data[] = \n{\n");
285 for (d = odata; d; d = d->next)
290 d->predicate && d->predicate[0] ? d->predicate : "0");
292 if (have_constraints)
294 printf (" \"%s\",\n",
295 d->constraint ? d->constraint : "");
298 printf (" %smode,\n", GET_MODE_NAME (d->mode));
300 if (! have_constraints)
301 printf (" %d,\n", d->address_p);
303 printf (" %d\n", d->strict_low);
313 register struct data *d;
315 int next_name_offset;
316 const char * last_name = 0;
317 const char * next_name = 0;
318 register struct data *n;
320 for (n = idata, next_name_offset = 1; n; n = n->next, next_name_offset++)
327 printf ("\nconst struct insn_data insn_data[] = \n{\n");
329 for (d = idata; d; d = d->next)
335 printf (" \"%s\",\n", d->name);
339 for (n = d->next, next_name_offset = 1; n;
340 n = n->next, next_name_offset++)
352 if (next_name && (last_name == 0
353 || name_offset > next_name_offset / 2))
354 printf (" \"%s-%d\",\n", next_name,
355 next_name_offset - name_offset);
357 printf (" \"%s+%d\",\n", last_name, name_offset);
360 switch (d->output_format)
362 case INSN_OUTPUT_FORMAT_NONE:
365 case INSN_OUTPUT_FORMAT_SINGLE:
366 printf (" \"%s\",\n", d->template);
368 case INSN_OUTPUT_FORMAT_MULTI:
369 case INSN_OUTPUT_FORMAT_FUNCTION:
370 printf (" output_%d,\n", d->code_number);
376 if (d->name && d->name[0] != '*')
377 printf (" gen_%s,\n", d->name);
381 printf (" &operand_data[%d],\n", d->operand_number);
382 printf (" %d,\n", d->n_operands);
383 printf (" %d,\n", d->n_dups);
384 printf (" %d,\n", d->n_alternatives);
385 printf (" %d\n", d->output_format);
393 output_get_insn_name ()
395 printf ("const char *\n");
396 printf ("get_insn_name (code)\n");
397 printf (" int code;\n");
399 printf (" return insn_data[code].name;\n");
404 /* Stores in max_opno the largest operand number present in `part', if
405 that is larger than the previous value of max_opno, and the rest of
406 the operand data into `d->operand[i]'.
408 THIS_ADDRESS_P is nonzero if the containing rtx was an ADDRESS.
409 THIS_STRICT_LOW is nonzero if the containing rtx was a STRICT_LOW_PART. */
415 scan_operands (d, part, this_address_p, this_strict_low)
422 register const char *format_ptr;
428 switch (GET_CODE (part))
431 opno = XINT (part, 0);
434 if (max_opno >= MAX_MAX_OPERANDS)
436 error ("Too many operands (%d) in definition %s.\n",
437 max_opno + 1, get_insn_name (next_index_number));
440 if (d->operand[opno].seen)
441 error ("Definition %s specified operand number %d more than once.\n",
442 get_insn_name (next_index_number), opno);
443 d->operand[opno].seen = 1;
444 d->operand[opno].mode = GET_MODE (part);
445 d->operand[opno].strict_low = this_strict_low;
446 d->operand[opno].predicate = XSTR (part, 1);
447 d->operand[opno].constraint = XSTR (part, 2);
448 if (XSTR (part, 2) != 0 && *XSTR (part, 2) != 0)
450 d->operand[opno].n_alternatives
451 = n_occurrences (',', XSTR (part, 2)) + 1;
452 have_constraints = 1;
454 d->operand[opno].address_p = this_address_p;
458 opno = XINT (part, 0);
461 if (max_opno >= MAX_MAX_OPERANDS)
463 error ("Too many operands (%d) in definition %s.\n",
464 max_opno + 1, get_insn_name (next_index_number));
467 if (d->operand[opno].seen)
468 error ("Definition %s specified operand number %d more than once.\n",
469 get_insn_name (next_index_number), opno);
470 d->operand[opno].seen = 1;
471 d->operand[opno].mode = GET_MODE (part);
472 d->operand[opno].strict_low = 0;
473 d->operand[opno].predicate = "scratch_operand";
474 d->operand[opno].constraint = XSTR (part, 1);
475 if (XSTR (part, 1) != 0 && *XSTR (part, 1) != 0)
477 d->operand[opno].n_alternatives
478 = n_occurrences (',', XSTR (part, 1)) + 1;
479 have_constraints = 1;
481 d->operand[opno].address_p = 0;
486 opno = XINT (part, 0);
489 if (max_opno >= MAX_MAX_OPERANDS)
491 error ("Too many operands (%d) in definition %s.\n",
492 max_opno + 1, get_insn_name (next_index_number));
495 if (d->operand[opno].seen)
496 error ("Definition %s specified operand number %d more than once.\n",
497 get_insn_name (next_index_number), opno);
498 d->operand[opno].seen = 1;
499 d->operand[opno].mode = GET_MODE (part);
500 d->operand[opno].strict_low = 0;
501 d->operand[opno].predicate = XSTR (part, 1);
502 d->operand[opno].constraint = 0;
503 d->operand[opno].address_p = 0;
504 for (i = 0; i < XVECLEN (part, 2); i++)
505 scan_operands (d, XVECEXP (part, 2, i), 0, 0);
515 scan_operands (d, XEXP (part, 0), 1, 0);
518 case STRICT_LOW_PART:
519 scan_operands (d, XEXP (part, 0), 0, 1);
526 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
528 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
529 switch (*format_ptr++)
533 scan_operands (d, XEXP (part, i), 0, 0);
536 if (XVEC (part, i) != NULL)
537 for (j = 0; j < XVECLEN (part, i); j++)
538 scan_operands (d, XVECEXP (part, i, j), 0, 0);
543 /* Compare two operands for content equality. */
546 compare_operands (d0, d1)
547 struct operand_data *d0, *d1;
557 if (strcmp (p0, p1) != 0)
560 if (have_constraints)
568 if (strcmp (p0, p1) != 0)
572 if (d0->mode != d1->mode)
575 if (!have_constraints)
576 if (d0->address_p != d1->address_p)
579 if (d0->strict_low != d1->strict_low)
585 /* Scan the list of operands we've already committed to output and either
586 find a subsequence that is the same, or allocate a new one at the end. */
592 struct operand_data *od, *od2;
595 if (d->n_operands == 0)
597 d->operand_number = 0;
601 /* Brute force substring search. */
602 for (od = odata, i = 0; od; od = od->next, i = 0)
603 if (compare_operands (od, &d->operand[0]))
609 if (i == d->n_operands)
613 if (! compare_operands (od2, &d->operand[i]))
615 ++i, od2 = od2->next;
619 /* Either partial match at the end of the list, or no match. In either
620 case, we tack on what operands are remaining to the end of the list. */
622 d->operand_number = next_operand_number - i;
623 for (; i < d->n_operands; ++i)
625 od2 = &d->operand[i];
627 odata_end = &od2->next;
628 od2->index = next_operand_number++;
634 d->operand_number = od->index;
639 /* Process an assembler template from a define_insn or a define_peephole.
640 It is either the assembler code template, a list of assembler code
641 templates, or C code to generate the assembler code template. */
644 process_template (d, template)
651 /* Templates starting with * contain straight code to be run. */
652 if (template[0] == '*')
655 d->output_format = INSN_OUTPUT_FORMAT_FUNCTION;
657 printf ("\nstatic const char *output_%d PROTO ((rtx *, rtx));\n",
659 puts ("\nstatic const char *");
660 printf ("output_%d (operands, insn)\n", d->code_number);
661 puts (" rtx *operands ATTRIBUTE_UNUSED;");
662 puts (" rtx insn ATTRIBUTE_UNUSED;");
669 /* If the assembler code template starts with a @ it is a newline-separated
670 list of assembler code templates, one for each alternative. */
671 else if (template[0] == '@')
674 d->output_format = INSN_OUTPUT_FORMAT_MULTI;
676 printf ("\nstatic const char * const output_%d[] = {\n", d->code_number);
678 for (i = 0, cp = &template[1]; *cp; )
680 while (*cp == '\n' || *cp == ' ' || *cp== '\t')
684 while (*cp != '\n' && *cp != '\0')
698 d->template = template;
699 d->output_format = INSN_OUTPUT_FORMAT_SINGLE;
703 /* Check insn D for consistency in number of constraint alternatives. */
706 validate_insn_alternatives (d)
709 register int n = 0, start;
711 /* Make sure all the operands have the same number of alternatives
712 in their constraints. Let N be that number. */
713 for (start = 0; start < d->n_operands; start++)
714 if (d->operand[start].n_alternatives > 0)
717 n = d->operand[start].n_alternatives;
718 else if (n != d->operand[start].n_alternatives)
719 error ("wrong number of alternatives in operand %d of insn %s",
720 start, get_insn_name (d->index_number));
723 /* Record the insn's overall number of alternatives. */
724 d->n_alternatives = n;
727 /* Look at a define_insn just read. Assign its code number. Record
728 on idata the template and the number of arguments. If the insn has
729 a hairy output action, output a function for now. */
735 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
738 d->code_number = next_code_number++;
739 d->index_number = next_index_number;
740 if (XSTR (insn, 0)[0])
741 d->name = XSTR (insn, 0);
745 /* Build up the list in the same order as the insns are seen
746 in the machine description. */
749 idata_end = &d->next;
753 memset (d->operand, 0, sizeof (d->operand));
755 for (i = 0; i < XVECLEN (insn, 1); i++)
756 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
758 d->n_operands = max_opno + 1;
759 d->n_dups = num_dups;
761 validate_insn_alternatives (d);
763 process_template (d, XSTR (insn, 3));
766 /* Look at a define_peephole just read. Assign its code number.
767 Record on idata the template and the number of arguments.
768 If the insn has a hairy output action, output it now. */
774 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
777 d->code_number = next_code_number++;
778 d->index_number = next_index_number;
781 /* Build up the list in the same order as the insns are seen
782 in the machine description. */
785 idata_end = &d->next;
789 memset (d->operand, 0, sizeof (d->operand));
791 /* Get the number of operands by scanning all the patterns of the
792 peephole optimizer. But ignore all the rest of the information
794 for (i = 0; i < XVECLEN (peep, 0); i++)
795 scan_operands (d, XVECEXP (peep, 0, i), 0, 0);
797 d->n_operands = max_opno + 1;
800 validate_insn_alternatives (d);
802 process_template (d, XSTR (peep, 2));
805 /* Process a define_expand just read. Assign its code number,
806 only for the purposes of `insn_gen_function'. */
812 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
815 d->code_number = next_code_number++;
816 d->index_number = next_index_number;
817 if (XSTR (insn, 0)[0])
818 d->name = XSTR (insn, 0);
822 /* Build up the list in the same order as the insns are seen
823 in the machine description. */
826 idata_end = &d->next;
830 memset (d->operand, 0, sizeof (d->operand));
832 /* Scan the operands to get the specified predicates and modes,
833 since expand_binop needs to know them. */
836 for (i = 0; i < XVECLEN (insn, 1); i++)
837 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
839 d->n_operands = max_opno + 1;
840 d->n_dups = num_dups;
842 d->output_format = INSN_OUTPUT_FORMAT_NONE;
844 validate_insn_alternatives (d);
848 /* Process a define_split just read. Assign its code number,
849 only for reasons of consistency and to simplify genrecog. */
855 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
858 d->code_number = next_code_number++;
859 d->index_number = next_index_number;
862 /* Build up the list in the same order as the insns are seen
863 in the machine description. */
866 idata_end = &d->next;
870 memset (d->operand, 0, sizeof (d->operand));
872 /* Get the number of operands by scanning all the patterns of the
873 split patterns. But ignore all the rest of the information thus
875 for (i = 0; i < XVECLEN (split, 0); i++)
876 scan_operands (d, XVECEXP (split, 0, i), 0, 0);
878 d->n_operands = max_opno + 1;
880 d->n_alternatives = 0;
882 d->output_format = INSN_OUTPUT_FORMAT_NONE;
891 register PTR val = (PTR) malloc (size);
894 fatal ("virtual memory exhausted");
905 ptr = (PTR) realloc (old, size);
907 ptr = (PTR) malloc (size);
909 fatal ("virtual memory exhausted");
913 extern int main PROTO ((int, char **));
924 progname = "genoutput";
925 obstack_init (rtl_obstack);
928 fatal ("No input file name.");
930 infile = fopen (argv[1], "r");
934 return (FATAL_EXIT_CODE);
938 next_code_number = 0;
939 next_index_number = 0;
940 have_constraints = 0;
942 /* Read the machine description. */
946 c = read_skip_spaces (infile);
951 desc = read_rtx (infile);
952 if (GET_CODE (desc) == DEFINE_INSN)
954 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
956 if (GET_CODE (desc) == DEFINE_EXPAND)
958 if (GET_CODE (desc) == DEFINE_SPLIT
959 || GET_CODE (desc) == DEFINE_PEEPHOLE2)
965 output_predicate_decls ();
966 output_operand_data ();
968 output_get_insn_name ();
971 return (ferror (stdout) != 0 || have_error
972 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);