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 GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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 \"insn-codes.h\"\n");
227 printf ("#include \"tm_p.h\"\n");
228 printf ("#include \"function.h\"\n");
229 printf ("#include \"regs.h\"\n");
230 printf ("#include \"hard-reg-set.h\"\n");
231 printf ("#include \"real.h\"\n");
232 printf ("#include \"insn-config.h\"\n\n");
233 printf ("#include \"conditions.h\"\n");
234 printf ("#include \"insn-attr.h\"\n\n");
235 printf ("#include \"recog.h\"\n\n");
236 printf ("#include \"toplev.h\"\n");
237 printf ("#include \"output.h\"\n");
241 /* We need to define all predicates used. Keep a list of those we
242 have defined so far. There normally aren't very many predicates
243 used, so a linked list should be fast enough. */
244 struct predicate { const char *name; struct predicate *next; };
247 output_predicate_decls ()
249 struct predicate *predicates = 0;
250 struct operand_data *d;
251 struct predicate *p, *next;
253 for (d = odata; d; d = d->next)
254 if (d->predicate && d->predicate[0])
256 for (p = predicates; p; p = p->next)
257 if (strcmp (p->name, d->predicate) == 0)
262 printf ("extern int %s PARAMS ((rtx, enum machine_mode));\n",
264 p = (struct predicate *) xmalloc (sizeof (struct predicate));
265 p->name = d->predicate;
266 p->next = predicates;
272 for (p = predicates; p; p = next)
280 output_operand_data ()
282 struct operand_data *d;
284 printf ("\nstatic const struct insn_operand_data operand_data[] = \n{\n");
286 for (d = odata; d; d = d->next)
291 d->predicate && d->predicate[0] ? d->predicate : "0");
293 printf (" \"%s\",\n", d->constraint ? d->constraint : "");
295 printf (" %smode,\n", GET_MODE_NAME (d->mode));
297 printf (" %d,\n", d->strict_low);
299 printf (" %d\n", d->eliminable);
311 int next_name_offset;
312 const char * last_name = 0;
313 const char * next_name = 0;
316 for (n = idata, next_name_offset = 1; n; n = n->next, next_name_offset++)
323 printf ("\nconst struct insn_data insn_data[] = \n{\n");
325 for (d = idata; d; d = d->next)
331 printf (" \"%s\",\n", d->name);
335 for (n = d->next, next_name_offset = 1; n;
336 n = n->next, next_name_offset++)
348 if (next_name && (last_name == 0
349 || name_offset > next_name_offset / 2))
350 printf (" \"%s-%d\",\n", next_name,
351 next_name_offset - name_offset);
353 printf (" \"%s+%d\",\n", last_name, name_offset);
356 switch (d->output_format)
358 case INSN_OUTPUT_FORMAT_NONE:
361 case INSN_OUTPUT_FORMAT_SINGLE:
363 const char *p = d->template;
369 if (IS_VSPACE (*p) && prev != '\\')
371 /* Preserve two consecutive \n's or \r's, but treat \r\n
372 as a single newline. */
373 if (*p == '\n' && prev != '\r')
384 case INSN_OUTPUT_FORMAT_MULTI:
385 case INSN_OUTPUT_FORMAT_FUNCTION:
386 printf (" (const PTR) output_%d,\n", d->code_number);
392 if (d->name && d->name[0] != '*')
393 printf (" (insn_gen_fn) gen_%s,\n", d->name);
397 printf (" &operand_data[%d],\n", d->operand_number);
398 printf (" %d,\n", d->n_operands);
399 printf (" %d,\n", d->n_dups);
400 printf (" %d,\n", d->n_alternatives);
401 printf (" %d\n", d->output_format);
409 output_get_insn_name ()
411 printf ("const char *\n");
412 printf ("get_insn_name (code)\n");
413 printf (" int code;\n");
415 printf (" return insn_data[code].name;\n");
420 /* Stores in max_opno the largest operand number present in `part', if
421 that is larger than the previous value of max_opno, and the rest of
422 the operand data into `d->operand[i]'.
424 THIS_ADDRESS_P is nonzero if the containing rtx was an ADDRESS.
425 THIS_STRICT_LOW is nonzero if the containing rtx was a STRICT_LOW_PART. */
431 scan_operands (d, part, this_address_p, this_strict_low)
438 const char *format_ptr;
444 switch (GET_CODE (part))
447 opno = XINT (part, 0);
450 if (max_opno >= MAX_MAX_OPERANDS)
452 message_with_line (d->lineno,
453 "maximum number of operands exceeded");
457 if (d->operand[opno].seen)
459 message_with_line (d->lineno,
460 "repeated operand number %d\n", opno);
464 d->operand[opno].seen = 1;
465 d->operand[opno].mode = GET_MODE (part);
466 d->operand[opno].strict_low = this_strict_low;
467 d->operand[opno].predicate = XSTR (part, 1);
468 d->operand[opno].constraint = strip_whitespace (XSTR (part, 2));
469 d->operand[opno].n_alternatives
470 = n_occurrences (',', d->operand[opno].constraint) + 1;
471 d->operand[opno].address_p = this_address_p;
472 d->operand[opno].eliminable = 1;
476 opno = XINT (part, 0);
479 if (max_opno >= MAX_MAX_OPERANDS)
481 message_with_line (d->lineno,
482 "maximum number of operands exceeded");
486 if (d->operand[opno].seen)
488 message_with_line (d->lineno,
489 "repeated operand number %d\n", opno);
493 d->operand[opno].seen = 1;
494 d->operand[opno].mode = GET_MODE (part);
495 d->operand[opno].strict_low = 0;
496 d->operand[opno].predicate = "scratch_operand";
497 d->operand[opno].constraint = strip_whitespace (XSTR (part, 1));
498 d->operand[opno].n_alternatives
499 = n_occurrences (',', d->operand[opno].constraint) + 1;
500 d->operand[opno].address_p = 0;
501 d->operand[opno].eliminable = 0;
506 opno = XINT (part, 0);
509 if (max_opno >= MAX_MAX_OPERANDS)
511 message_with_line (d->lineno,
512 "maximum number of operands exceeded");
516 if (d->operand[opno].seen)
518 message_with_line (d->lineno,
519 "repeated operand number %d\n", opno);
523 d->operand[opno].seen = 1;
524 d->operand[opno].mode = GET_MODE (part);
525 d->operand[opno].strict_low = 0;
526 d->operand[opno].predicate = XSTR (part, 1);
527 d->operand[opno].constraint = 0;
528 d->operand[opno].address_p = 0;
529 d->operand[opno].eliminable = 0;
530 for (i = 0; i < XVECLEN (part, 2); i++)
531 scan_operands (d, XVECEXP (part, 2, i), 0, 0);
541 scan_operands (d, XEXP (part, 0), 1, 0);
544 case STRICT_LOW_PART:
545 scan_operands (d, XEXP (part, 0), 0, 1);
552 format_ptr = GET_RTX_FORMAT (GET_CODE (part));
554 for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
555 switch (*format_ptr++)
559 scan_operands (d, XEXP (part, i), 0, 0);
562 if (XVEC (part, i) != NULL)
563 for (j = 0; j < XVECLEN (part, i); j++)
564 scan_operands (d, XVECEXP (part, i, j), 0, 0);
569 /* Compare two operands for content equality. */
572 compare_operands (d0, d1)
573 struct operand_data *d0, *d1;
583 if (strcmp (p0, p1) != 0)
592 if (strcmp (p0, p1) != 0)
595 if (d0->mode != d1->mode)
598 if (d0->strict_low != d1->strict_low)
601 if (d0->eliminable != d1->eliminable)
607 /* Scan the list of operands we've already committed to output and either
608 find a subsequence that is the same, or allocate a new one at the end. */
614 struct operand_data *od, *od2;
617 if (d->n_operands == 0)
619 d->operand_number = 0;
623 /* Brute force substring search. */
624 for (od = odata, i = 0; od; od = od->next, i = 0)
625 if (compare_operands (od, &d->operand[0]))
631 if (i == d->n_operands)
635 if (! compare_operands (od2, &d->operand[i]))
637 ++i, od2 = od2->next;
641 /* Either partial match at the end of the list, or no match. In either
642 case, we tack on what operands are remaining to the end of the list. */
644 d->operand_number = next_operand_number - i;
645 for (; i < d->n_operands; ++i)
647 od2 = &d->operand[i];
649 odata_end = &od2->next;
650 od2->index = next_operand_number++;
656 d->operand_number = od->index;
661 /* Process an assembler template from a define_insn or a define_peephole.
662 It is either the assembler code template, a list of assembler code
663 templates, or C code to generate the assembler code template. */
666 process_template (d, template)
668 const char *template;
673 /* Templates starting with * contain straight code to be run. */
674 if (template[0] == '*')
677 d->output_format = INSN_OUTPUT_FORMAT_FUNCTION;
679 printf ("\nstatic const char *output_%d PARAMS ((rtx *, rtx));\n",
681 puts ("\nstatic const char *");
682 printf ("output_%d (operands, insn)\n", d->code_number);
683 puts (" rtx *operands ATTRIBUTE_UNUSED;");
684 puts (" rtx insn ATTRIBUTE_UNUSED;");
691 /* If the assembler code template starts with a @ it is a newline-separated
692 list of assembler code templates, one for each alternative. */
693 else if (template[0] == '@')
696 d->output_format = INSN_OUTPUT_FORMAT_MULTI;
698 printf ("\nstatic const char * const output_%d[] = {\n", d->code_number);
700 for (i = 0, cp = &template[1]; *cp; )
702 while (ISSPACE (*cp))
706 while (!IS_VSPACE (*cp) && *cp != '\0')
716 message_with_line (d->lineno,
717 "'@' is redundant for output template with single alternative");
718 if (i != d->n_alternatives)
720 message_with_line (d->lineno,
721 "wrong number of alternatives in the output template");
729 d->template = template;
730 d->output_format = INSN_OUTPUT_FORMAT_SINGLE;
734 /* Check insn D for consistency in number of constraint alternatives. */
737 validate_insn_alternatives (d)
742 /* Make sure all the operands have the same number of alternatives
743 in their constraints. Let N be that number. */
744 for (start = 0; start < d->n_operands; start++)
745 if (d->operand[start].n_alternatives > 0)
748 n = d->operand[start].n_alternatives;
749 else if (n != d->operand[start].n_alternatives)
751 message_with_line (d->lineno,
752 "wrong number of alternatives in operand %d",
758 /* Record the insn's overall number of alternatives. */
759 d->n_alternatives = n;
762 /* Verify that there are no gaps in operand numbers for INSNs. */
765 validate_insn_operands (d)
770 for (i = 0; i < d->n_operands; ++i)
771 if (d->operand[i].seen == 0)
773 message_with_line (d->lineno, "missing operand %d", i);
778 /* Look at a define_insn just read. Assign its code number. Record
779 on idata the template and the number of arguments. If the insn has
780 a hairy output action, output a function for now. */
783 gen_insn (insn, lineno)
787 struct data *d = (struct data *) xmalloc (sizeof (struct data));
790 d->code_number = next_code_number;
791 d->index_number = next_index_number;
793 if (XSTR (insn, 0)[0])
794 d->name = XSTR (insn, 0);
798 /* Build up the list in the same order as the insns are seen
799 in the machine description. */
802 idata_end = &d->next;
806 memset (d->operand, 0, sizeof (d->operand));
808 for (i = 0; i < XVECLEN (insn, 1); i++)
809 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
811 d->n_operands = max_opno + 1;
812 d->n_dups = num_dups;
814 validate_insn_operands (d);
815 validate_insn_alternatives (d);
817 process_template (d, XTMPL (insn, 3));
820 /* Look at a define_peephole just read. Assign its code number.
821 Record on idata the template and the number of arguments.
822 If the insn has a hairy output action, output it now. */
825 gen_peephole (peep, lineno)
829 struct data *d = (struct data *) xmalloc (sizeof (struct data));
832 d->code_number = next_code_number;
833 d->index_number = next_index_number;
837 /* Build up the list in the same order as the insns are seen
838 in the machine description. */
841 idata_end = &d->next;
845 memset (d->operand, 0, sizeof (d->operand));
847 /* Get the number of operands by scanning all the patterns of the
848 peephole optimizer. But ignore all the rest of the information
850 for (i = 0; i < XVECLEN (peep, 0); i++)
851 scan_operands (d, XVECEXP (peep, 0, i), 0, 0);
853 d->n_operands = max_opno + 1;
856 validate_insn_alternatives (d);
858 process_template (d, XTMPL (peep, 2));
861 /* Process a define_expand just read. Assign its code number,
862 only for the purposes of `insn_gen_function'. */
865 gen_expand (insn, lineno)
869 struct data *d = (struct data *) xmalloc (sizeof (struct data));
872 d->code_number = next_code_number;
873 d->index_number = next_index_number;
875 if (XSTR (insn, 0)[0])
876 d->name = XSTR (insn, 0);
880 /* Build up the list in the same order as the insns are seen
881 in the machine description. */
884 idata_end = &d->next;
888 memset (d->operand, 0, sizeof (d->operand));
890 /* Scan the operands to get the specified predicates and modes,
891 since expand_binop needs to know them. */
894 for (i = 0; i < XVECLEN (insn, 1); i++)
895 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
897 d->n_operands = max_opno + 1;
898 d->n_dups = num_dups;
900 d->output_format = INSN_OUTPUT_FORMAT_NONE;
902 validate_insn_alternatives (d);
906 /* Process a define_split just read. Assign its code number,
907 only for reasons of consistency and to simplify genrecog. */
910 gen_split (split, lineno)
914 struct data *d = (struct data *) xmalloc (sizeof (struct data));
917 d->code_number = next_code_number;
918 d->index_number = next_index_number;
922 /* Build up the list in the same order as the insns are seen
923 in the machine description. */
926 idata_end = &d->next;
930 memset (d->operand, 0, sizeof (d->operand));
932 /* Get the number of operands by scanning all the patterns of the
933 split patterns. But ignore all the rest of the information thus
935 for (i = 0; i < XVECLEN (split, 0); i++)
936 scan_operands (d, XVECEXP (split, 0, i), 0, 0);
938 d->n_operands = max_opno + 1;
940 d->n_alternatives = 0;
942 d->output_format = INSN_OUTPUT_FORMAT_NONE;
947 extern int main PARAMS ((int, char **));
956 progname = "genoutput";
959 fatal ("no input file name");
961 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
962 return (FATAL_EXIT_CODE);
965 next_code_number = 0;
966 next_index_number = 0;
968 /* Read the machine description. */
974 desc = read_md_rtx (&line_no, &next_code_number);
978 if (GET_CODE (desc) == DEFINE_INSN)
979 gen_insn (desc, line_no);
980 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
981 gen_peephole (desc, line_no);
982 if (GET_CODE (desc) == DEFINE_EXPAND)
983 gen_expand (desc, line_no);
984 if (GET_CODE (desc) == DEFINE_SPLIT
985 || GET_CODE (desc) == DEFINE_PEEPHOLE2)
986 gen_split (desc, line_no);
991 output_predicate_decls ();
992 output_operand_data ();
994 output_get_insn_name ();
997 return (ferror (stdout) != 0 || have_error
998 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
1001 /* Return the number of occurrences of character C in string S or
1002 -1 if S is the null string. */
1005 n_occurrences (c, s)
1011 if (s == 0 || *s == '\0')
1020 /* Remove whitespace in `s' by moving up characters until the end.
1021 Return a new string. */
1024 strip_whitespace (s)
1033 p = q = xmalloc (strlen (s) + 1);
1034 while ((ch = *s++) != '\0')