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. */
92 #include "gensupport.h"
94 /* No instruction can have more operands than this. Sorry for this
95 arbitrary limit, but what machine will have an instruction with
96 this many operands? */
98 #define MAX_MAX_OPERANDS 40
100 static int n_occurrences PARAMS ((int, const char *));
101 static const char *strip_whitespace PARAMS ((const char *));
103 /* insns in the machine description are assigned sequential code numbers
104 that are used by insn-recog.c (produced by genrecog) to communicate
105 to insn-output.c (produced by this program). */
107 static int next_code_number;
109 /* This counts all definitions in the md file,
110 for the sake of error messages. */
112 static int next_index_number;
114 /* This counts all operands used in the md file. The first is null. */
116 static int next_operand_number = 1;
118 /* Record in this chain all information about the operands we will output. */
122 struct operand_data *next;
124 const char *predicate;
125 const char *constraint;
126 enum machine_mode mode;
127 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, 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;
162 int n_operands; /* Number of operands this insn recognizes */
163 int n_dups; /* Number times match_dup appears in pattern */
164 int n_alternatives; /* Number of alternatives in each constraint */
165 int operand_number; /* Operand index in the big array. */
166 int output_format; /* INSN_OUTPUT_FORMAT_*. */
167 struct operand_data operand[MAX_MAX_OPERANDS];
170 /* This variable points to the first link in the insn chain. */
172 static struct data *idata, **idata_end = &idata;
174 static void output_prologue PARAMS ((void));
175 static void output_predicate_decls PARAMS ((void));
176 static void output_operand_data PARAMS ((void));
177 static void output_insn_data PARAMS ((void));
178 static void output_get_insn_name PARAMS ((void));
179 static void scan_operands PARAMS ((struct data *, rtx, int, int));
180 static int compare_operands PARAMS ((struct operand_data *,
181 struct operand_data *));
182 static void place_operands PARAMS ((struct data *));
183 static void process_template PARAMS ((struct data *, const char *));
184 static void validate_insn_alternatives PARAMS ((struct data *));
185 static void validate_insn_operands PARAMS ((struct data *));
186 static void gen_insn PARAMS ((rtx, int));
187 static void gen_peephole PARAMS ((rtx, int));
188 static void gen_expand PARAMS ((rtx, int));
189 static void gen_split PARAMS ((rtx, int));
192 get_insn_name (index)
195 static char buf[100];
197 struct data *i, *last_named = NULL;
198 for (i = idata; i ; i = i->next)
200 if (i->index_number == index)
207 sprintf(buf, "%s+%d", last_named->name, index - last_named->index_number);
209 sprintf(buf, "insn %d", index);
217 printf ("/* Generated automatically by the program `genoutput'\n\
218 from the machine description file `md'. */\n\n");
220 printf ("#include \"config.h\"\n");
221 printf ("#include \"system.h\"\n");
222 printf ("#include \"flags.h\"\n");
223 printf ("#include \"ggc.h\"\n");
224 printf ("#include \"rtl.h\"\n");
225 printf ("#include \"expr.h\"\n");
226 printf ("#include \"tm_p.h\"\n");
227 printf ("#include \"function.h\"\n");
228 printf ("#include \"regs.h\"\n");
229 printf ("#include \"hard-reg-set.h\"\n");
230 printf ("#include \"real.h\"\n");
231 printf ("#include \"insn-config.h\"\n\n");
232 printf ("#include \"conditions.h\"\n");
233 printf ("#include \"insn-attr.h\"\n\n");
234 printf ("#include \"recog.h\"\n\n");
235 printf ("#include \"toplev.h\"\n");
236 printf ("#include \"output.h\"\n");
240 /* We need to define all predicates used. Keep a list of those we
241 have defined so far. There normally aren't very many predicates
242 used, so a linked list should be fast enough. */
243 struct predicate { const char *name; struct predicate *next; };
246 output_predicate_decls ()
248 struct predicate *predicates = 0;
249 register struct operand_data *d;
250 struct predicate *p, *next;
252 for (d = odata; d; d = d->next)
253 if (d->predicate && d->predicate[0])
255 for (p = predicates; p; p = p->next)
256 if (strcmp (p->name, d->predicate) == 0)
261 printf ("extern int %s PARAMS ((rtx, enum machine_mode));\n",
263 p = (struct predicate *) xmalloc (sizeof (struct predicate));
264 p->name = d->predicate;
265 p->next = predicates;
271 for (p = predicates; p; p = next)
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:
362 const char *p = d->template;
368 if (*p == '\n' && prev != '\\')
378 case INSN_OUTPUT_FORMAT_MULTI:
379 case INSN_OUTPUT_FORMAT_FUNCTION:
380 printf (" (const PTR) output_%d,\n", d->code_number);
386 if (d->name && d->name[0] != '*')
387 printf (" (insn_gen_fn) gen_%s,\n", d->name);
391 printf (" &operand_data[%d],\n", d->operand_number);
392 printf (" %d,\n", d->n_operands);
393 printf (" %d,\n", d->n_dups);
394 printf (" %d,\n", d->n_alternatives);
395 printf (" %d\n", d->output_format);
403 output_get_insn_name ()
405 printf ("const char *\n");
406 printf ("get_insn_name (code)\n");
407 printf (" int code;\n");
409 printf (" return insn_data[code].name;\n");
414 /* Stores in max_opno the largest operand number present in `part', if
415 that is larger than the previous value of max_opno, and the rest of
416 the operand data into `d->operand[i]'.
418 THIS_ADDRESS_P is nonzero if the containing rtx was an ADDRESS.
419 THIS_STRICT_LOW is nonzero if the containing rtx was a STRICT_LOW_PART. */
425 scan_operands (d, part, this_address_p, this_strict_low)
432 register const char *format_ptr;
438 switch (GET_CODE (part))
441 opno = XINT (part, 0);
444 if (max_opno >= MAX_MAX_OPERANDS)
446 message_with_line (d->lineno,
447 "maximum number of operands exceeded");
451 if (d->operand[opno].seen)
453 message_with_line (d->lineno,
454 "repeated operand number %d\n", opno);
458 d->operand[opno].seen = 1;
459 d->operand[opno].mode = GET_MODE (part);
460 d->operand[opno].strict_low = this_strict_low;
461 d->operand[opno].predicate = XSTR (part, 1);
462 d->operand[opno].constraint = strip_whitespace (XSTR (part, 2));
463 d->operand[opno].n_alternatives
464 = n_occurrences (',', d->operand[opno].constraint) + 1;
465 d->operand[opno].address_p = this_address_p;
466 d->operand[opno].eliminable = 1;
470 opno = XINT (part, 0);
473 if (max_opno >= MAX_MAX_OPERANDS)
475 message_with_line (d->lineno,
476 "maximum number of operands exceeded");
480 if (d->operand[opno].seen)
482 message_with_line (d->lineno,
483 "repeated operand number %d\n", 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 = "scratch_operand";
491 d->operand[opno].constraint = strip_whitespace (XSTR (part, 1));
492 d->operand[opno].n_alternatives
493 = n_occurrences (',', d->operand[opno].constraint) + 1;
494 d->operand[opno].address_p = 0;
495 d->operand[opno].eliminable = 0;
500 opno = XINT (part, 0);
503 if (max_opno >= MAX_MAX_OPERANDS)
505 message_with_line (d->lineno,
506 "maximum number of operands exceeded");
510 if (d->operand[opno].seen)
512 message_with_line (d->lineno,
513 "repeated operand number %d\n", opno);
517 d->operand[opno].seen = 1;
518 d->operand[opno].mode = GET_MODE (part);
519 d->operand[opno].strict_low = 0;
520 d->operand[opno].predicate = XSTR (part, 1);
521 d->operand[opno].constraint = 0;
522 d->operand[opno].address_p = 0;
523 d->operand[opno].eliminable = 0;
524 for (i = 0; i < XVECLEN (part, 2); i++)
525 scan_operands (d, XVECEXP (part, 2, i), 0, 0);
535 scan_operands (d, XEXP (part, 0), 1, 0);
538 case STRICT_LOW_PART:
539 scan_operands (d, XEXP (part, 0), 0, 1);
546 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
548 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
549 switch (*format_ptr++)
553 scan_operands (d, XEXP (part, i), 0, 0);
556 if (XVEC (part, i) != NULL)
557 for (j = 0; j < XVECLEN (part, i); j++)
558 scan_operands (d, XVECEXP (part, i, j), 0, 0);
563 /* Compare two operands for content equality. */
566 compare_operands (d0, d1)
567 struct operand_data *d0, *d1;
577 if (strcmp (p0, p1) != 0)
586 if (strcmp (p0, p1) != 0)
589 if (d0->mode != d1->mode)
592 if (d0->strict_low != d1->strict_low)
595 if (d0->eliminable != d1->eliminable)
601 /* Scan the list of operands we've already committed to output and either
602 find a subsequence that is the same, or allocate a new one at the end. */
608 struct operand_data *od, *od2;
611 if (d->n_operands == 0)
613 d->operand_number = 0;
617 /* Brute force substring search. */
618 for (od = odata, i = 0; od; od = od->next, i = 0)
619 if (compare_operands (od, &d->operand[0]))
625 if (i == d->n_operands)
629 if (! compare_operands (od2, &d->operand[i]))
631 ++i, od2 = od2->next;
635 /* Either partial match at the end of the list, or no match. In either
636 case, we tack on what operands are remaining to the end of the list. */
638 d->operand_number = next_operand_number - i;
639 for (; i < d->n_operands; ++i)
641 od2 = &d->operand[i];
643 odata_end = &od2->next;
644 od2->index = next_operand_number++;
650 d->operand_number = od->index;
655 /* Process an assembler template from a define_insn or a define_peephole.
656 It is either the assembler code template, a list of assembler code
657 templates, or C code to generate the assembler code template. */
660 process_template (d, template)
662 const char *template;
664 register const char *cp;
667 /* Templates starting with * contain straight code to be run. */
668 if (template[0] == '*')
671 d->output_format = INSN_OUTPUT_FORMAT_FUNCTION;
673 printf ("\nstatic const char *output_%d PARAMS ((rtx *, rtx));\n",
675 puts ("\nstatic const char *");
676 printf ("output_%d (operands, insn)\n", d->code_number);
677 puts (" rtx *operands ATTRIBUTE_UNUSED;");
678 puts (" rtx insn ATTRIBUTE_UNUSED;");
685 /* If the assembler code template starts with a @ it is a newline-separated
686 list of assembler code templates, one for each alternative. */
687 else if (template[0] == '@')
690 d->output_format = INSN_OUTPUT_FORMAT_MULTI;
692 printf ("\nstatic const char * const output_%d[] = {\n", d->code_number);
694 for (i = 0, cp = &template[1]; *cp; )
696 while (*cp == '\n' || *cp == ' ' || *cp== '\t')
700 while (*cp != '\n' && *cp != '\0')
710 message_with_line (d->lineno,
711 "'@' is redundant for output template with single alternative");
712 if (i != d->n_alternatives)
714 message_with_line (d->lineno,
715 "Wrong number of alternatives in the output template");
723 d->template = template;
724 d->output_format = INSN_OUTPUT_FORMAT_SINGLE;
728 /* Check insn D for consistency in number of constraint alternatives. */
731 validate_insn_alternatives (d)
734 register int n = 0, start;
736 /* Make sure all the operands have the same number of alternatives
737 in their constraints. Let N be that number. */
738 for (start = 0; start < d->n_operands; start++)
739 if (d->operand[start].n_alternatives > 0)
742 n = d->operand[start].n_alternatives;
743 else if (n != d->operand[start].n_alternatives)
745 message_with_line (d->lineno,
746 "wrong number of alternatives in operand %d",
752 /* Record the insn's overall number of alternatives. */
753 d->n_alternatives = n;
756 /* Verify that there are no gaps in operand numbers for INSNs. */
759 validate_insn_operands (d)
764 for (i = 0; i < d->n_operands; ++i)
765 if (d->operand[i].seen == 0)
767 message_with_line (d->lineno, "missing operand %d", i);
772 /* Look at a define_insn just read. Assign its code number. Record
773 on idata the template and the number of arguments. If the insn has
774 a hairy output action, output a function for now. */
777 gen_insn (insn, lineno)
781 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
784 d->code_number = next_code_number;
785 d->index_number = next_index_number;
787 if (XSTR (insn, 0)[0])
788 d->name = XSTR (insn, 0);
792 /* Build up the list in the same order as the insns are seen
793 in the machine description. */
796 idata_end = &d->next;
800 memset (d->operand, 0, sizeof (d->operand));
802 for (i = 0; i < XVECLEN (insn, 1); i++)
803 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
805 d->n_operands = max_opno + 1;
806 d->n_dups = num_dups;
808 validate_insn_operands (d);
809 validate_insn_alternatives (d);
811 process_template (d, XTMPL (insn, 3));
814 /* Look at a define_peephole just read. Assign its code number.
815 Record on idata the template and the number of arguments.
816 If the insn has a hairy output action, output it now. */
819 gen_peephole (peep, lineno)
823 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
826 d->code_number = next_code_number;
827 d->index_number = next_index_number;
831 /* Build up the list in the same order as the insns are seen
832 in the machine description. */
835 idata_end = &d->next;
839 memset (d->operand, 0, sizeof (d->operand));
841 /* Get the number of operands by scanning all the patterns of the
842 peephole optimizer. But ignore all the rest of the information
844 for (i = 0; i < XVECLEN (peep, 0); i++)
845 scan_operands (d, XVECEXP (peep, 0, i), 0, 0);
847 d->n_operands = max_opno + 1;
850 validate_insn_alternatives (d);
852 process_template (d, XTMPL (peep, 2));
855 /* Process a define_expand just read. Assign its code number,
856 only for the purposes of `insn_gen_function'. */
859 gen_expand (insn, lineno)
863 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
866 d->code_number = next_code_number;
867 d->index_number = next_index_number;
869 if (XSTR (insn, 0)[0])
870 d->name = XSTR (insn, 0);
874 /* Build up the list in the same order as the insns are seen
875 in the machine description. */
878 idata_end = &d->next;
882 memset (d->operand, 0, sizeof (d->operand));
884 /* Scan the operands to get the specified predicates and modes,
885 since expand_binop needs to know them. */
888 for (i = 0; i < XVECLEN (insn, 1); i++)
889 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
891 d->n_operands = max_opno + 1;
892 d->n_dups = num_dups;
894 d->output_format = INSN_OUTPUT_FORMAT_NONE;
896 validate_insn_alternatives (d);
900 /* Process a define_split just read. Assign its code number,
901 only for reasons of consistency and to simplify genrecog. */
904 gen_split (split, lineno)
908 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
911 d->code_number = next_code_number;
912 d->index_number = next_index_number;
916 /* Build up the list in the same order as the insns are seen
917 in the machine description. */
920 idata_end = &d->next;
924 memset (d->operand, 0, sizeof (d->operand));
926 /* Get the number of operands by scanning all the patterns of the
927 split patterns. But ignore all the rest of the information thus
929 for (i = 0; i < XVECLEN (split, 0); i++)
930 scan_operands (d, XVECEXP (split, 0, i), 0, 0);
932 d->n_operands = max_opno + 1;
934 d->n_alternatives = 0;
936 d->output_format = INSN_OUTPUT_FORMAT_NONE;
941 extern int main PARAMS ((int, char **));
950 progname = "genoutput";
953 fatal ("No input file name.");
955 if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
956 return (FATAL_EXIT_CODE);
959 next_code_number = 0;
960 next_index_number = 0;
962 /* Read the machine description. */
968 desc = read_md_rtx (&line_no, &next_code_number);
972 if (GET_CODE (desc) == DEFINE_INSN)
973 gen_insn (desc, line_no);
974 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
975 gen_peephole (desc, line_no);
976 if (GET_CODE (desc) == DEFINE_EXPAND)
977 gen_expand (desc, line_no);
978 if (GET_CODE (desc) == DEFINE_SPLIT
979 || GET_CODE (desc) == DEFINE_PEEPHOLE2)
980 gen_split (desc, line_no);
985 output_predicate_decls ();
986 output_operand_data ();
988 output_get_insn_name ();
991 return (ferror (stdout) != 0 || have_error
992 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
995 /* Return the number of occurrences of character C in string S or
996 -1 if S is the null string. */
1005 if (s == 0 || *s == '\0')
1014 /* Remove whitespace in `s' by moving up characters until the end.
1015 Return a new string. */
1018 strip_whitespace (s)
1027 p = q = xmalloc (strlen (s) + 1);
1028 while ((ch = *s++) != '\0')