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. */
91 #include "gensupport.h"
93 /* No instruction can have more operands than this. Sorry for this
94 arbitrary limit, but what machine will have an instruction with
95 this many operands? */
97 #define MAX_MAX_OPERANDS 40
99 static int n_occurrences PARAMS ((int, const char *));
100 static const char *strip_whitespace PARAMS ((const char *));
102 /* insns in the machine description are assigned sequential code numbers
103 that are used by insn-recog.c (produced by genrecog) to communicate
104 to insn-output.c (produced by this program). */
106 static int next_code_number;
108 /* This counts all definitions in the md file,
109 for the sake of error messages. */
111 static int next_index_number;
113 /* This counts all operands used in the md file. The first is null. */
115 static int next_operand_number = 1;
117 /* Record in this chain all information about the operands we will output. */
121 struct operand_data *next;
123 const char *predicate;
124 const char *constraint;
125 enum machine_mode mode;
126 unsigned char n_alternatives;
133 /* Begin with a null operand at index 0. */
135 static struct operand_data null_operand =
137 0, 0, "", "", VOIDmode, 0, 0, 0, 0, 0
140 static struct operand_data *odata = &null_operand;
141 static struct operand_data **odata_end = &null_operand.next;
143 /* Must match the constants in recog.h. */
145 #define INSN_OUTPUT_FORMAT_NONE 0 /* abort */
146 #define INSN_OUTPUT_FORMAT_SINGLE 1 /* const char * */
147 #define INSN_OUTPUT_FORMAT_MULTI 2 /* const char * const * */
148 #define INSN_OUTPUT_FORMAT_FUNCTION 3 /* const char * (*)(...) */
150 /* Record in this chain all information that we will output,
151 associated with the code number of the insn. */
157 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 static int have_error;
175 static void output_prologue PARAMS ((void));
176 static void output_predicate_decls PARAMS ((void));
177 static void output_operand_data PARAMS ((void));
178 static void output_insn_data PARAMS ((void));
179 static void output_get_insn_name PARAMS ((void));
180 static void scan_operands PARAMS ((struct data *, rtx, int, int));
181 static int compare_operands PARAMS ((struct operand_data *,
182 struct operand_data *));
183 static void place_operands PARAMS ((struct data *));
184 static void process_template PARAMS ((struct data *, const char *));
185 static void validate_insn_alternatives 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 \"tm_p.h\"\n");
226 printf ("#include \"function.h\"\n");
227 printf ("#include \"regs.h\"\n");
228 printf ("#include \"hard-reg-set.h\"\n");
229 printf ("#include \"real.h\"\n");
230 printf ("#include \"insn-config.h\"\n\n");
231 printf ("#include \"conditions.h\"\n");
232 printf ("#include \"insn-flags.h\"\n");
233 printf ("#include \"insn-attr.h\"\n\n");
234 printf ("#include \"insn-codes.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. */
246 output_predicate_decls ()
248 struct predicate { const char *name; struct predicate *next; } *predicates = 0;
249 register struct operand_data *d;
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 *) alloca (sizeof (struct predicate));
264 p->name = d->predicate;
265 p->next = predicates;
274 output_operand_data ()
276 register struct operand_data *d;
278 printf ("\nstatic const struct insn_operand_data operand_data[] = \n{\n");
280 for (d = odata; d; d = d->next)
285 d->predicate && d->predicate[0] ? d->predicate : "0");
287 printf (" \"%s\",\n", d->constraint ? d->constraint : "");
289 printf (" %smode,\n", GET_MODE_NAME (d->mode));
291 printf (" %d,\n", d->strict_low);
293 printf (" %d\n", d->eliminable);
303 register struct data *d;
305 int next_name_offset;
306 const char * last_name = 0;
307 const char * next_name = 0;
308 register struct data *n;
310 for (n = idata, next_name_offset = 1; n; n = n->next, next_name_offset++)
317 printf ("\nconst struct insn_data insn_data[] = \n{\n");
319 for (d = idata; d; d = d->next)
325 printf (" \"%s\",\n", d->name);
329 for (n = d->next, next_name_offset = 1; n;
330 n = n->next, next_name_offset++)
342 if (next_name && (last_name == 0
343 || name_offset > next_name_offset / 2))
344 printf (" \"%s-%d\",\n", next_name,
345 next_name_offset - name_offset);
347 printf (" \"%s+%d\",\n", last_name, name_offset);
350 switch (d->output_format)
352 case INSN_OUTPUT_FORMAT_NONE:
355 case INSN_OUTPUT_FORMAT_SINGLE:
356 printf (" \"%s\",\n", d->template);
358 case INSN_OUTPUT_FORMAT_MULTI:
359 case INSN_OUTPUT_FORMAT_FUNCTION:
360 printf (" (const PTR) output_%d,\n", d->code_number);
366 if (d->name && d->name[0] != '*')
367 printf (" (insn_gen_fn) gen_%s,\n", d->name);
371 printf (" &operand_data[%d],\n", d->operand_number);
372 printf (" %d,\n", d->n_operands);
373 printf (" %d,\n", d->n_dups);
374 printf (" %d,\n", d->n_alternatives);
375 printf (" %d\n", d->output_format);
383 output_get_insn_name ()
385 printf ("const char *\n");
386 printf ("get_insn_name (code)\n");
387 printf (" int code;\n");
389 printf (" return insn_data[code].name;\n");
394 /* Stores in max_opno the largest operand number present in `part', if
395 that is larger than the previous value of max_opno, and the rest of
396 the operand data into `d->operand[i]'.
398 THIS_ADDRESS_P is nonzero if the containing rtx was an ADDRESS.
399 THIS_STRICT_LOW is nonzero if the containing rtx was a STRICT_LOW_PART. */
405 scan_operands (d, part, this_address_p, this_strict_low)
412 register const char *format_ptr;
418 switch (GET_CODE (part))
421 opno = XINT (part, 0);
424 if (max_opno >= MAX_MAX_OPERANDS)
426 message_with_line (d->lineno,
427 "maximum number of operands exceeded");
431 if (d->operand[opno].seen)
433 message_with_line (d->lineno,
434 "repeated operand number %d\n", 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 message_with_line (d->lineno,
456 "maximum number of operands exceeded");
460 if (d->operand[opno].seen)
462 message_with_line (d->lineno,
463 "repeated operand number %d\n", opno);
467 d->operand[opno].seen = 1;
468 d->operand[opno].mode = GET_MODE (part);
469 d->operand[opno].strict_low = 0;
470 d->operand[opno].predicate = "scratch_operand";
471 d->operand[opno].constraint = strip_whitespace (XSTR (part, 1));
472 d->operand[opno].n_alternatives
473 = n_occurrences (',', d->operand[opno].constraint) + 1;
474 d->operand[opno].address_p = 0;
475 d->operand[opno].eliminable = 0;
480 opno = XINT (part, 0);
483 if (max_opno >= MAX_MAX_OPERANDS)
485 message_with_line (d->lineno,
486 "maximum number of operands exceeded");
490 if (d->operand[opno].seen)
492 message_with_line (d->lineno,
493 "repeated operand number %d\n", opno);
497 d->operand[opno].seen = 1;
498 d->operand[opno].mode = GET_MODE (part);
499 d->operand[opno].strict_low = 0;
500 d->operand[opno].predicate = XSTR (part, 1);
501 d->operand[opno].constraint = 0;
502 d->operand[opno].address_p = 0;
503 d->operand[opno].eliminable = 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)
566 if (strcmp (p0, p1) != 0)
569 if (d0->mode != d1->mode)
572 if (d0->strict_low != d1->strict_low)
575 if (d0->eliminable != d1->eliminable)
581 /* Scan the list of operands we've already committed to output and either
582 find a subsequence that is the same, or allocate a new one at the end. */
588 struct operand_data *od, *od2;
591 if (d->n_operands == 0)
593 d->operand_number = 0;
597 /* Brute force substring search. */
598 for (od = odata, i = 0; od; od = od->next, i = 0)
599 if (compare_operands (od, &d->operand[0]))
605 if (i == d->n_operands)
609 if (! compare_operands (od2, &d->operand[i]))
611 ++i, od2 = od2->next;
615 /* Either partial match at the end of the list, or no match. In either
616 case, we tack on what operands are remaining to the end of the list. */
618 d->operand_number = next_operand_number - i;
619 for (; i < d->n_operands; ++i)
621 od2 = &d->operand[i];
623 odata_end = &od2->next;
624 od2->index = next_operand_number++;
630 d->operand_number = od->index;
635 /* Process an assembler template from a define_insn or a define_peephole.
636 It is either the assembler code template, a list of assembler code
637 templates, or C code to generate the assembler code template. */
640 process_template (d, template)
642 const char *template;
644 register const char *cp;
647 /* Templates starting with * contain straight code to be run. */
648 if (template[0] == '*')
651 d->output_format = INSN_OUTPUT_FORMAT_FUNCTION;
653 printf ("\nstatic const char *output_%d PARAMS ((rtx *, rtx));\n",
655 puts ("\nstatic const char *");
656 printf ("output_%d (operands, insn)\n", d->code_number);
657 puts (" rtx *operands ATTRIBUTE_UNUSED;");
658 puts (" rtx insn ATTRIBUTE_UNUSED;");
665 /* If the assembler code template starts with a @ it is a newline-separated
666 list of assembler code templates, one for each alternative. */
667 else if (template[0] == '@')
670 d->output_format = INSN_OUTPUT_FORMAT_MULTI;
672 printf ("\nstatic const char * const output_%d[] = {\n", d->code_number);
674 for (i = 0, cp = &template[1]; *cp; )
676 while (*cp == '\n' || *cp == ' ' || *cp== '\t')
680 while (*cp != '\n' && *cp != '\0')
694 d->template = template;
695 d->output_format = INSN_OUTPUT_FORMAT_SINGLE;
699 /* Check insn D for consistency in number of constraint alternatives. */
702 validate_insn_alternatives (d)
705 register int n = 0, start;
707 /* Make sure all the operands have the same number of alternatives
708 in their constraints. Let N be that number. */
709 for (start = 0; start < d->n_operands; start++)
710 if (d->operand[start].n_alternatives > 0)
713 n = d->operand[start].n_alternatives;
714 else if (n != d->operand[start].n_alternatives)
716 message_with_line (d->lineno,
717 "wrong number of alternatives in operand %d",
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. */
732 gen_insn (insn, lineno)
736 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
739 d->code_number = next_code_number;
740 d->index_number = next_index_number;
742 if (XSTR (insn, 0)[0])
743 d->name = XSTR (insn, 0);
747 /* Build up the list in the same order as the insns are seen
748 in the machine description. */
751 idata_end = &d->next;
755 memset (d->operand, 0, sizeof (d->operand));
757 for (i = 0; i < XVECLEN (insn, 1); i++)
758 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
760 d->n_operands = max_opno + 1;
761 d->n_dups = num_dups;
763 validate_insn_alternatives (d);
765 process_template (d, XSTR (insn, 3));
768 /* Look at a define_peephole just read. Assign its code number.
769 Record on idata the template and the number of arguments.
770 If the insn has a hairy output action, output it now. */
773 gen_peephole (peep, lineno)
777 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
780 d->code_number = next_code_number;
781 d->index_number = next_index_number;
785 /* Build up the list in the same order as the insns are seen
786 in the machine description. */
789 idata_end = &d->next;
793 memset (d->operand, 0, sizeof (d->operand));
795 /* Get the number of operands by scanning all the patterns of the
796 peephole optimizer. But ignore all the rest of the information
798 for (i = 0; i < XVECLEN (peep, 0); i++)
799 scan_operands (d, XVECEXP (peep, 0, i), 0, 0);
801 d->n_operands = max_opno + 1;
804 validate_insn_alternatives (d);
806 process_template (d, XSTR (peep, 2));
809 /* Process a define_expand just read. Assign its code number,
810 only for the purposes of `insn_gen_function'. */
813 gen_expand (insn, lineno)
817 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
820 d->code_number = next_code_number;
821 d->index_number = next_index_number;
823 if (XSTR (insn, 0)[0])
824 d->name = XSTR (insn, 0);
828 /* Build up the list in the same order as the insns are seen
829 in the machine description. */
832 idata_end = &d->next;
836 memset (d->operand, 0, sizeof (d->operand));
838 /* Scan the operands to get the specified predicates and modes,
839 since expand_binop needs to know them. */
842 for (i = 0; i < XVECLEN (insn, 1); i++)
843 scan_operands (d, XVECEXP (insn, 1, i), 0, 0);
845 d->n_operands = max_opno + 1;
846 d->n_dups = num_dups;
848 d->output_format = INSN_OUTPUT_FORMAT_NONE;
850 validate_insn_alternatives (d);
854 /* Process a define_split just read. Assign its code number,
855 only for reasons of consistency and to simplify genrecog. */
858 gen_split (split, lineno)
862 register struct data *d = (struct data *) xmalloc (sizeof (struct data));
865 d->code_number = next_code_number;
866 d->index_number = next_index_number;
870 /* Build up the list in the same order as the insns are seen
871 in the machine description. */
874 idata_end = &d->next;
878 memset (d->operand, 0, sizeof (d->operand));
880 /* Get the number of operands by scanning all the patterns of the
881 split patterns. But ignore all the rest of the information thus
883 for (i = 0; i < XVECLEN (split, 0); i++)
884 scan_operands (d, XVECEXP (split, 0, i), 0, 0);
886 d->n_operands = max_opno + 1;
888 d->n_alternatives = 0;
890 d->output_format = INSN_OUTPUT_FORMAT_NONE;
895 extern int main PARAMS ((int, char **));
905 fatal ("No input file name.");
907 if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
908 return (FATAL_EXIT_CODE);
911 next_code_number = 0;
912 next_index_number = 0;
914 /* Read the machine description. */
920 desc = read_md_rtx (&line_no, &next_code_number);
924 if (GET_CODE (desc) == DEFINE_INSN)
925 gen_insn (desc, line_no);
926 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
927 gen_peephole (desc, line_no);
928 if (GET_CODE (desc) == DEFINE_EXPAND)
929 gen_expand (desc, line_no);
930 if (GET_CODE (desc) == DEFINE_SPLIT
931 || GET_CODE (desc) == DEFINE_PEEPHOLE2)
932 gen_split (desc, line_no);
937 output_predicate_decls ();
938 output_operand_data ();
940 output_get_insn_name ();
943 return (ferror (stdout) != 0 || have_error
944 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
947 /* Return the number of occurrences of character C in string S or
948 -1 if S is the null string. */
957 if (s == 0 || *s == '\0')
966 /* Remove whitespace in `s' by moving up characters until the end.
967 Return a new string. */
979 p = q = xmalloc (strlen (s) + 1);
980 while ((ch = *s++) != '\0')