1 /* Generate code from to output assembler insns as recognized from rtl.
2 Copyright (C) 1987, 1988, 1992, 1994, 1995, 1997, 1998, 1999, 2000
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 f. `eliminable', is nonzero for operands that are matched normally by
69 MATCH_OPERAND; it is zero for operands that should not be changed during
70 register elimination such as MATCH_OPERATORs.
72 The code number of an insn is simply its position in the machine
73 description; code numbers are assigned sequentially to entries in
74 the description, starting with code number 0.
76 Thus, the following entry in the machine description
79 [(set (match_operand:DF 0 "general_operand" "")
84 assuming it is the 25th entry present, would cause
85 insn_data[24].template to be "clrd %0", and
86 insn_data[24].n_operands to be 1. */
93 #include "gensupport.h"
95 /* No instruction can have more operands than this. Sorry for this
96 arbitrary limit, but what machine will have an instruction with
97 this many operands? */
99 #define MAX_MAX_OPERANDS 40
101 static struct obstack obstack;
102 struct obstack *rtl_obstack = &obstack;
104 #define obstack_chunk_alloc xmalloc
105 #define obstack_chunk_free free
107 static int n_occurrences PARAMS ((int, const char *));
108 static const char *strip_whitespace PARAMS ((const char *));
110 /* insns in the machine description are assigned sequential code numbers
111 that are used by insn-recog.c (produced by genrecog) to communicate
112 to insn-output.c (produced by this program). */
114 static int next_code_number;
116 /* This counts all definitions in the md file,
117 for the sake of error messages. */
119 static int next_index_number;
121 /* This counts all operands used in the md file. The first is null. */
123 static int next_operand_number = 1;
125 /* Record in this chain all information about the operands we will output. */
129 struct operand_data *next;
131 const char *predicate;
132 const char *constraint;
133 enum machine_mode mode;
134 unsigned char n_alternatives;
141 /* Begin with a null operand at index 0. */
143 static struct operand_data null_operand =
145 0, 0, "", "", VOIDmode, 0, 0, 0, 0, 0
148 static struct operand_data *odata = &null_operand;
149 static struct operand_data **odata_end = &null_operand.next;
151 /* Must match the constants in recog.h. */
153 #define INSN_OUTPUT_FORMAT_NONE 0 /* abort */
154 #define INSN_OUTPUT_FORMAT_SINGLE 1 /* const char * */
155 #define INSN_OUTPUT_FORMAT_MULTI 2 /* const char * const * */
156 #define INSN_OUTPUT_FORMAT_FUNCTION 3 /* const char * (*)(...) */
158 /* Record in this chain all information that we will output,
159 associated with the code number of the insn. */
165 const char *template;
168 int n_operands; /* Number of operands this insn recognizes */
169 int n_dups; /* Number times match_dup appears in pattern */
170 int n_alternatives; /* Number of alternatives in each constraint */
171 int operand_number; /* Operand index in the big array. */
172 int output_format; /* INSN_OUTPUT_FORMAT_*. */
173 struct operand_data operand[MAX_MAX_OPERANDS];
176 /* This variable points to the first link in the insn chain. */
178 static struct data *idata, **idata_end = &idata;
180 static void output_prologue PARAMS ((void));
181 static void output_predicate_decls PARAMS ((void));
182 static void output_operand_data PARAMS ((void));
183 static void output_insn_data PARAMS ((void));
184 static void output_get_insn_name PARAMS ((void));
185 static void scan_operands PARAMS ((struct data *, rtx, int, int));
186 static int compare_operands PARAMS ((struct operand_data *,
187 struct operand_data *));
188 static void place_operands PARAMS ((struct data *));
189 static void process_template PARAMS ((struct data *, const char *));
190 static void validate_insn_alternatives PARAMS ((struct data *));
191 static void gen_insn PARAMS ((rtx));
192 static void gen_peephole PARAMS ((rtx));
193 static void gen_expand PARAMS ((rtx));
194 static void gen_split PARAMS ((rtx));
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 ("#include \"config.h\"\n");
226 printf ("#include \"system.h\"\n");
227 printf ("#include \"flags.h\"\n");
228 printf ("#include \"ggc.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");
241 printf ("#include \"toplev.h\"\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 PARAMS ((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 printf (" \"%s\",\n", d->constraint ? d->constraint : "");
294 printf (" %smode,\n", GET_MODE_NAME (d->mode));
296 printf (" %d,\n", d->strict_low);
298 printf (" %d\n", d->eliminable);
308 register struct data *d;
310 int next_name_offset;
311 const char * last_name = 0;
312 const char * next_name = 0;
313 register struct data *n;
315 for (n = idata, next_name_offset = 1; n; n = n->next, next_name_offset++)
322 printf ("\nconst struct insn_data insn_data[] = \n{\n");
324 for (d = idata; d; d = d->next)
330 printf (" \"%s\",\n", d->name);
334 for (n = d->next, next_name_offset = 1; n;
335 n = n->next, next_name_offset++)
347 if (next_name && (last_name == 0
348 || name_offset > next_name_offset / 2))
349 printf (" \"%s-%d\",\n", next_name,
350 next_name_offset - name_offset);
352 printf (" \"%s+%d\",\n", last_name, name_offset);
355 switch (d->output_format)
357 case INSN_OUTPUT_FORMAT_NONE:
360 case INSN_OUTPUT_FORMAT_SINGLE:
361 printf (" \"%s\",\n", d->template);
363 case INSN_OUTPUT_FORMAT_MULTI:
364 case INSN_OUTPUT_FORMAT_FUNCTION:
365 printf (" (const PTR) output_%d,\n", d->code_number);
371 if (d->name && d->name[0] != '*')
372 printf (" (insn_gen_fn) gen_%s,\n", d->name);
376 printf (" &operand_data[%d],\n", d->operand_number);
377 printf (" %d,\n", d->n_operands);
378 printf (" %d,\n", d->n_dups);
379 printf (" %d,\n", d->n_alternatives);
380 printf (" %d\n", d->output_format);
388 output_get_insn_name ()
390 printf ("const char *\n");
391 printf ("get_insn_name (code)\n");
392 printf (" int code;\n");
394 printf (" return insn_data[code].name;\n");
399 /* Stores in max_opno the largest operand number present in `part', if
400 that is larger than the previous value of max_opno, and the rest of
401 the operand data into `d->operand[i]'.
403 THIS_ADDRESS_P is nonzero if the containing rtx was an ADDRESS.
404 THIS_STRICT_LOW is nonzero if the containing rtx was a STRICT_LOW_PART. */
410 scan_operands (d, part, this_address_p, this_strict_low)
417 register const char *format_ptr;
423 switch (GET_CODE (part))
426 opno = XINT (part, 0);
429 if (max_opno >= MAX_MAX_OPERANDS)
431 error ("Too many operands (%d) in definition %s.\n",
432 max_opno + 1, get_insn_name (next_index_number));
435 if (d->operand[opno].seen)
436 error ("Definition %s specified operand number %d more than once.\n",
437 get_insn_name (next_index_number), opno);
438 d->operand[opno].seen = 1;
439 d->operand[opno].mode = GET_MODE (part);
440 d->operand[opno].strict_low = this_strict_low;
441 d->operand[opno].predicate = XSTR (part, 1);
442 d->operand[opno].constraint = strip_whitespace (XSTR (part, 2));
443 d->operand[opno].n_alternatives
444 = n_occurrences (',', d->operand[opno].constraint) + 1;
445 d->operand[opno].address_p = this_address_p;
446 d->operand[opno].eliminable = 1;
450 opno = XINT (part, 0);
453 if (max_opno >= MAX_MAX_OPERANDS)
455 error ("Too many operands (%d) in definition %s.\n",
456 max_opno + 1, get_insn_name (next_index_number));
459 if (d->operand[opno].seen)
460 error ("Definition %s specified operand number %d more than once.\n",
461 get_insn_name (next_index_number), opno);
462 d->operand[opno].seen = 1;
463 d->operand[opno].mode = GET_MODE (part);
464 d->operand[opno].strict_low = 0;
465 d->operand[opno].predicate = "scratch_operand";
466 d->operand[opno].constraint = strip_whitespace (XSTR (part, 1));
467 d->operand[opno].n_alternatives
468 = n_occurrences (',', d->operand[opno].constraint) + 1;
469 d->operand[opno].address_p = 0;
470 d->operand[opno].eliminable = 0;
475 opno = XINT (part, 0);
478 if (max_opno >= MAX_MAX_OPERANDS)
480 error ("Too many operands (%d) in definition %s.\n",
481 max_opno + 1, get_insn_name (next_index_number));
484 if (d->operand[opno].seen)
485 error ("Definition %s specified operand number %d more than once.\n",
486 get_insn_name (next_index_number), opno);
487 d->operand[opno].seen = 1;
488 d->operand[opno].mode = GET_MODE (part);
489 d->operand[opno].strict_low = 0;
490 d->operand[opno].predicate = XSTR (part, 1);
491 d->operand[opno].constraint = 0;
492 d->operand[opno].address_p = 0;
493 d->operand[opno].eliminable = 0;
494 for (i = 0; i < XVECLEN (part, 2); i++)
495 scan_operands (d, XVECEXP (part, 2, i), 0, 0);
505 scan_operands (d, XEXP (part, 0), 1, 0);
508 case STRICT_LOW_PART:
509 scan_operands (d, XEXP (part, 0), 0, 1);
516 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
518 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
519 switch (*format_ptr++)
523 scan_operands (d, XEXP (part, i), 0, 0);
526 if (XVEC (part, i) != NULL)
527 for (j = 0; j < XVECLEN (part, i); j++)
528 scan_operands (d, XVECEXP (part, i, j), 0, 0);
533 /* Compare two operands for content equality. */
536 compare_operands (d0, d1)
537 struct operand_data *d0, *d1;
547 if (strcmp (p0, p1) != 0)
556 if (strcmp (p0, p1) != 0)
559 if (d0->mode != d1->mode)
562 if (d0->strict_low != d1->strict_low)
565 if (d0->eliminable != d1->eliminable)
571 /* Scan the list of operands we've already committed to output and either
572 find a subsequence that is the same, or allocate a new one at the end. */
578 struct operand_data *od, *od2;
581 if (d->n_operands == 0)
583 d->operand_number = 0;
587 /* Brute force substring search. */
588 for (od = odata, i = 0; od; od = od->next, i = 0)
589 if (compare_operands (od, &d->operand[0]))
595 if (i == d->n_operands)
599 if (! compare_operands (od2, &d->operand[i]))
601 ++i, od2 = od2->next;
605 /* Either partial match at the end of the list, or no match. In either
606 case, we tack on what operands are remaining to the end of the list. */
608 d->operand_number = next_operand_number - i;
609 for (; i < d->n_operands; ++i)
611 od2 = &d->operand[i];
613 odata_end = &od2->next;
614 od2->index = next_operand_number++;
620 d->operand_number = od->index;
625 /* Process an assembler template from a define_insn or a define_peephole.
626 It is either the assembler code template, a list of assembler code
627 templates, or C code to generate the assembler code template. */
630 process_template (d, template)
632 const char *template;
634 register const char *cp;
637 /* Templates starting with * contain straight code to be run. */
638 if (template[0] == '*')
641 d->output_format = INSN_OUTPUT_FORMAT_FUNCTION;
643 printf ("\nstatic const char *output_%d PARAMS ((rtx *, rtx));\n",
645 puts ("\nstatic const char *");
646 printf ("output_%d (operands, insn)\n", d->code_number);
647 puts (" rtx *operands ATTRIBUTE_UNUSED;");
648 puts (" rtx insn ATTRIBUTE_UNUSED;");
655 /* If the assembler code template starts with a @ it is a newline-separated
656 list of assembler code templates, one for each alternative. */
657 else if (template[0] == '@')
660 d->output_format = INSN_OUTPUT_FORMAT_MULTI;
662 printf ("\nstatic const char * const output_%d[] = {\n", d->code_number);
664 for (i = 0, cp = &template[1]; *cp; )
666 while (*cp == '\n' || *cp == ' ' || *cp== '\t')
670 while (*cp != '\n' && *cp != '\0')
684 d->template = template;
685 d->output_format = INSN_OUTPUT_FORMAT_SINGLE;
689 /* Check insn D for consistency in number of constraint alternatives. */
692 validate_insn_alternatives (d)
695 register int n = 0, start;
697 /* Make sure all the operands have the same number of alternatives
698 in their constraints. Let N be that number. */
699 for (start = 0; start < d->n_operands; start++)
700 if (d->operand[start].n_alternatives > 0)
703 n = d->operand[start].n_alternatives;
704 else if (n != d->operand[start].n_alternatives)
705 error ("wrong number of alternatives in operand %d of insn %s",
706 start, get_insn_name (d->index_number));
709 /* Record the insn's overall number of alternatives. */
710 d->n_alternatives = n;
713 /* Look at a define_insn just read. Assign its code number. Record
714 on idata the template and the number of arguments. If the insn has
715 a hairy output action, output a function for now. */
721 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
724 d->code_number = next_code_number;
725 d->index_number = next_index_number;
726 if (XSTR (insn, 0)[0])
727 d->name = XSTR (insn, 0);
731 /* Build up the list in the same order as the insns are seen
732 in the machine description. */
735 idata_end = &d->next;
739 memset (d->operand, 0, sizeof (d->operand));
741 for (i = 0; i < XVECLEN (insn, 1); i++)
742 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
744 d->n_operands = max_opno + 1;
745 d->n_dups = num_dups;
747 validate_insn_alternatives (d);
749 process_template (d, XSTR (insn, 3));
752 /* Look at a define_peephole just read. Assign its code number.
753 Record on idata the template and the number of arguments.
754 If the insn has a hairy output action, output it now. */
760 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
763 d->code_number = next_code_number;
764 d->index_number = next_index_number;
767 /* Build up the list in the same order as the insns are seen
768 in the machine description. */
771 idata_end = &d->next;
775 memset (d->operand, 0, sizeof (d->operand));
777 /* Get the number of operands by scanning all the patterns of the
778 peephole optimizer. But ignore all the rest of the information
780 for (i = 0; i < XVECLEN (peep, 0); i++)
781 scan_operands (d, XVECEXP (peep, 0, i), 0, 0);
783 d->n_operands = max_opno + 1;
786 validate_insn_alternatives (d);
788 process_template (d, XSTR (peep, 2));
791 /* Process a define_expand just read. Assign its code number,
792 only for the purposes of `insn_gen_function'. */
798 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
801 d->code_number = next_code_number;
802 d->index_number = next_index_number;
803 if (XSTR (insn, 0)[0])
804 d->name = XSTR (insn, 0);
808 /* Build up the list in the same order as the insns are seen
809 in the machine description. */
812 idata_end = &d->next;
816 memset (d->operand, 0, sizeof (d->operand));
818 /* Scan the operands to get the specified predicates and modes,
819 since expand_binop needs to know them. */
822 for (i = 0; i < XVECLEN (insn, 1); i++)
823 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
825 d->n_operands = max_opno + 1;
826 d->n_dups = num_dups;
828 d->output_format = INSN_OUTPUT_FORMAT_NONE;
830 validate_insn_alternatives (d);
834 /* Process a define_split just read. Assign its code number,
835 only for reasons of consistency and to simplify genrecog. */
841 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
844 d->code_number = next_code_number;
845 d->index_number = next_index_number;
848 /* Build up the list in the same order as the insns are seen
849 in the machine description. */
852 idata_end = &d->next;
856 memset (d->operand, 0, sizeof (d->operand));
858 /* Get the number of operands by scanning all the patterns of the
859 split patterns. But ignore all the rest of the information thus
861 for (i = 0; i < XVECLEN (split, 0); i++)
862 scan_operands (d, XVECEXP (split, 0, i), 0, 0);
864 d->n_operands = max_opno + 1;
866 d->n_alternatives = 0;
868 d->output_format = INSN_OUTPUT_FORMAT_NONE;
877 register PTR val = (PTR) malloc (size);
880 fatal ("virtual memory exhausted");
891 ptr = (PTR) realloc (old, size);
893 ptr = (PTR) malloc (size);
895 fatal ("virtual memory exhausted");
899 extern int main PARAMS ((int, char **));
908 progname = "genoutput";
909 obstack_init (rtl_obstack);
912 fatal ("No input file name.");
914 if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
915 return (FATAL_EXIT_CODE);
918 next_code_number = 0;
919 next_index_number = 0;
921 /* Read the machine description. */
927 desc = read_md_rtx (&line_no, &next_code_number);
931 if (GET_CODE (desc) == DEFINE_INSN)
933 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
935 if (GET_CODE (desc) == DEFINE_EXPAND)
937 if (GET_CODE (desc) == DEFINE_SPLIT
938 || GET_CODE (desc) == DEFINE_PEEPHOLE2)
944 output_predicate_decls ();
945 output_operand_data ();
947 output_get_insn_name ();
950 return (ferror (stdout) != 0 || have_error
951 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
954 /* Return the number of occurrences of character C in string S or
955 -1 if S is the null string. */
964 if (s == 0 || *s == '\0')
973 /* Remove whitespace in `s' by moving up characters until the end.
974 Return a new string. */
986 p = q = xmalloc (strlen (s) + 1);
987 while ((ch = *s++) != '\0')