1 /* Generate code from machine description to emit insns as rtl.
2 Copyright (C) 1987, 88, 91, 94, 95, 97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
27 static struct obstack obstack;
28 struct obstack *rtl_obstack = &obstack;
30 #define obstack_chunk_alloc xmalloc
31 #define obstack_chunk_free free
33 char *xmalloc PROTO((unsigned));
35 void fancy_abort PROTO((void));
38 static int max_dup_opno;
39 static int register_constraints;
40 static int insn_code_number;
41 static int insn_index_number;
43 /* Data structure for recording the patterns of insns that have CLOBBERs.
44 We use this to output a function that adds these CLOBBERs to a
45 previously-allocated PARALLEL expression. */
49 struct clobber_ent *insns;
52 struct clobber_pat *next;
55 /* Records one insn that uses the clobber list. */
59 int code_number; /* Counts only insns. */
60 struct clobber_ent *next;
67 register RTX_CODE code;
77 if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
78 register_constraints = 1;
79 if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
80 register_constraints = 1;
81 if (code == MATCH_OPERAND || code == MATCH_OPERATOR
82 || code == MATCH_PARALLEL)
83 max_opno = MAX (max_opno, XINT (x, 0));
84 if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
85 max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
87 fmt = GET_RTX_FORMAT (code);
88 len = GET_RTX_LENGTH (code);
89 for (i = 0; i < len; i++)
91 if (fmt[i] == 'e' || fmt[i] == 'u')
92 max_operand_1 (XEXP (x, i));
93 else if (fmt[i] == 'E')
96 for (j = 0; j < XVECLEN (x, i); j++)
97 max_operand_1 (XVECEXP (x, i, j));
103 max_operand_vec (insn, arg)
107 register int len = XVECLEN (insn, arg);
113 for (i = 0; i < len; i++)
114 max_operand_1 (XVECEXP (insn, arg, i));
124 for (p1 = GET_RTX_NAME (code); *p1; p1++)
126 if (*p1 >= 'a' && *p1 <= 'z')
127 putchar (*p1 + 'A' - 'a');
133 /* Print a C expression to construct an RTX just like X,
134 substituting any operand references appearing within. */
140 register RTX_CODE code;
157 printf ("operand%d", XINT (x, 0));
161 printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
162 XINT (x, 0), XINT (x, 0));
163 for (i = 0; i < XVECLEN (x, 1); i++)
166 gen_exp (XVECEXP (x, 1, i));
172 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
173 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
174 for (i = 0; i < XVECLEN (x, 2); i++)
177 gen_exp (XVECEXP (x, 2, i));
184 printf ("operand%d", XINT (x, 0));
188 printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
192 fatal ("ADDRESS expression code used in named instruction pattern");
204 printf ("const0_rtx");
205 else if (INTVAL (x) == 1)
206 printf ("const1_rtx");
207 else if (INTVAL (x) == -1)
208 printf ("constm1_rtx");
209 else if (INTVAL (x) == STORE_FLAG_VALUE)
210 printf ("const_true_rtx");
213 printf ("GEN_INT (");
214 printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
220 /* These shouldn't be written in MD files. Instead, the appropriate
221 routines in varasm.c should be called. */
230 printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
232 fmt = GET_RTX_FORMAT (code);
233 len = GET_RTX_LENGTH (code);
234 for (i = 0; i < len; i++)
239 if (fmt[i] == 'e' || fmt[i] == 'u')
240 gen_exp (XEXP (x, i));
241 else if (fmt[i] == 'i')
242 printf ("%u", XINT (x, i));
243 else if (fmt[i] == 's')
244 printf ("\"%s\"", XSTR (x, i));
245 else if (fmt[i] == 'E')
248 printf ("gen_rtvec (%d", XVECLEN (x, i));
249 for (j = 0; j < XVECLEN (x, i); j++)
252 gen_exp (XVECEXP (x, i, j));
262 /* Generate the `gen_...' function for a DEFINE_INSN. */
271 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
272 registers or MATCH_SCRATCHes. If so, store away the information for
277 for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
278 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
279 || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
280 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
283 if (i != XVECLEN (insn, 1) - 1)
285 register struct clobber_pat *p;
286 register struct clobber_ent *link
287 = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
290 link->code_number = insn_code_number;
292 /* See if any previous CLOBBER_LIST entry is the same as this
295 for (p = clobber_list; p; p = p->next)
297 if (p->first_clobber != i + 1
298 || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
301 for (j = i + 1; j < XVECLEN (insn, 1); j++)
303 rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
304 rtx new = XEXP (XVECEXP (insn, 1, j), 0);
306 /* OLD and NEW are the same if both are to be a SCRATCH
308 or if both are registers of the same mode and number. */
309 if (! (GET_MODE (old) == GET_MODE (new)
310 && ((GET_CODE (old) == MATCH_SCRATCH
311 && GET_CODE (new) == MATCH_SCRATCH)
312 || (GET_CODE (old) == REG && GET_CODE (new) == REG
313 && REGNO (old) == REGNO (new)))))
317 if (j == XVECLEN (insn, 1))
323 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
327 p->first_clobber = i + 1;
328 p->next = clobber_list;
332 link->next = p->insns;
337 /* Don't mention instructions whose names are the null string
338 or begin with '*'. They are in the machine description just
340 if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
343 /* Find out how many operands this function has,
344 and also whether any of them have register constraints. */
345 register_constraints = 0;
346 operands = max_operand_vec (insn, 1);
347 if (max_dup_opno >= operands)
348 fatal ("match_dup operand number has no match_operand");
350 /* Output the function name and argument declarations. */
351 printf ("rtx\ngen_%s (", XSTR (insn, 0));
352 for (i = 0; i < operands; i++)
353 printf (i ? ", operand%d" : "operand%d", i);
355 for (i = 0; i < operands; i++)
356 printf (" rtx operand%d;\n", i);
359 /* Output code to construct and return the rtl for the instruction body */
361 if (XVECLEN (insn, 1) == 1)
364 gen_exp (XVECEXP (insn, 1, 0));
369 printf (" return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
370 for (i = 0; i < XVECLEN (insn, 1); i++)
373 gen_exp (XVECEXP (insn, 1, i));
375 printf ("));\n}\n\n");
379 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
388 if (strlen (XSTR (expand, 0)) == 0)
389 fatal ("define_expand lacks a name");
390 if (XVEC (expand, 1) == 0)
391 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
393 /* Find out how many operands this function has,
394 and also whether any of them have register constraints. */
395 register_constraints = 0;
397 operands = max_operand_vec (expand, 1);
399 /* Output the function name and argument declarations. */
400 printf ("rtx\ngen_%s (", XSTR (expand, 0));
401 for (i = 0; i < operands; i++)
402 printf (i ? ", operand%d" : "operand%d", i);
404 for (i = 0; i < operands; i++)
405 printf (" rtx operand%d;\n", i);
408 /* If we don't have any C code to write, only one insn is being written,
409 and no MATCH_DUPs are present, we can just return the desired insn
410 like we do for a DEFINE_INSN. This saves memory. */
411 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
412 && operands > max_dup_opno
413 && XVECLEN (expand, 1) == 1)
416 gen_exp (XVECEXP (expand, 1, 0));
421 /* For each operand referred to only with MATCH_DUPs,
422 make a local variable. */
423 for (i = operands; i <= max_dup_opno; i++)
424 printf (" rtx operand%d;\n", i);
425 if (operands > 0 || max_dup_opno >= 0)
426 printf (" rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
427 printf (" rtx _val = 0;\n");
428 printf (" start_sequence ();\n");
430 /* The fourth operand of DEFINE_EXPAND is some code to be executed
431 before the actual construction.
432 This code expects to refer to `operands'
433 just as the output-code in a DEFINE_INSN does,
434 but here `operands' is an automatic array.
435 So copy the operand values there before executing it. */
436 if (XSTR (expand, 3) && *XSTR (expand, 3))
438 /* Output code to copy the arguments into `operands'. */
439 for (i = 0; i < operands; i++)
440 printf (" operands[%d] = operand%d;\n", i, i);
442 /* Output the special code to be executed before the sequence
444 printf ("%s\n", XSTR (expand, 3));
446 /* Output code to copy the arguments back out of `operands'
447 (unless we aren't going to use them at all). */
448 if (XVEC (expand, 1) != 0)
450 for (i = 0; i < operands; i++)
451 printf (" operand%d = operands[%d];\n", i, i);
452 for (; i <= max_dup_opno; i++)
453 printf (" operand%d = operands[%d];\n", i, i);
457 /* Output code to construct the rtl for the instruction bodies.
458 Use emit_insn to add them to the sequence being accumulated.
459 But don't do this if the user's code has set `no_more' nonzero. */
461 for (i = 0; i < XVECLEN (expand, 1); i++)
463 rtx next = XVECEXP (expand, 1, i);
464 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
465 || (GET_CODE (next) == PARALLEL
466 && GET_CODE (XVECEXP (next, 0, 0)) == SET
467 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
468 || GET_CODE (next) == RETURN)
469 printf (" emit_jump_insn (");
470 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
471 || GET_CODE (next) == CALL
472 || (GET_CODE (next) == PARALLEL
473 && GET_CODE (XVECEXP (next, 0, 0)) == SET
474 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
475 || (GET_CODE (next) == PARALLEL
476 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
477 printf (" emit_call_insn (");
478 else if (GET_CODE (next) == CODE_LABEL)
479 printf (" emit_label (");
480 else if (GET_CODE (next) == MATCH_OPERAND
481 || GET_CODE (next) == MATCH_OPERATOR
482 || GET_CODE (next) == MATCH_PARALLEL
483 || GET_CODE (next) == MATCH_OP_DUP
484 || GET_CODE (next) == MATCH_DUP
485 || GET_CODE (next) == PARALLEL)
488 printf (" emit_insn (");
491 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
492 && GET_CODE (SET_SRC (next)) == LABEL_REF)
493 printf (" emit_barrier ();");
496 /* Call `gen_sequence' to make a SEQUENCE out of all the
497 insns emitted within this gen_... function. */
499 printf (" _val = gen_sequence ();\n");
500 printf (" end_sequence ();\n");
501 printf (" return _val;\n}\n\n");
504 /* Like gen_expand, but generates a SEQUENCE. */
513 if (XVEC (split, 0) == 0)
514 fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
515 else if (XVEC (split, 2) == 0)
516 fatal ("define_split (definition %d) lacks a replacement pattern",
519 /* Find out how many operands this function has. */
521 max_operand_vec (split, 2);
522 operands = MAX (max_opno, max_dup_opno) + 1;
524 /* Output the function name and argument declarations. */
525 printf ("rtx\ngen_split_%d (operands)\n rtx *operands;\n",
529 /* Declare all local variables. */
530 for (i = 0; i < operands; i++)
531 printf (" rtx operand%d;\n", i);
532 printf (" rtx _val = 0;\n");
533 printf (" start_sequence ();\n");
535 /* The fourth operand of DEFINE_SPLIT is some code to be executed
536 before the actual construction. */
539 printf ("%s\n", XSTR (split, 3));
541 /* Output code to copy the arguments back out of `operands' */
542 for (i = 0; i < operands; i++)
543 printf (" operand%d = operands[%d];\n", i, i);
545 /* Output code to construct the rtl for the instruction bodies.
546 Use emit_insn to add them to the sequence being accumulated.
547 But don't do this if the user's code has set `no_more' nonzero. */
549 for (i = 0; i < XVECLEN (split, 2); i++)
551 rtx next = XVECEXP (split, 2, i);
552 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
553 || (GET_CODE (next) == PARALLEL
554 && GET_CODE (XVECEXP (next, 0, 0)) == SET
555 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
556 || GET_CODE (next) == RETURN)
557 printf (" emit_jump_insn (");
558 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
559 || GET_CODE (next) == CALL
560 || (GET_CODE (next) == PARALLEL
561 && GET_CODE (XVECEXP (next, 0, 0)) == SET
562 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
563 || (GET_CODE (next) == PARALLEL
564 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
565 printf (" emit_call_insn (");
566 else if (GET_CODE (next) == CODE_LABEL)
567 printf (" emit_label (");
568 else if (GET_CODE (next) == MATCH_OPERAND
569 || GET_CODE (next) == MATCH_OPERATOR
570 || GET_CODE (next) == MATCH_PARALLEL
571 || GET_CODE (next) == MATCH_OP_DUP
572 || GET_CODE (next) == MATCH_DUP
573 || GET_CODE (next) == PARALLEL)
576 printf (" emit_insn (");
579 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
580 && GET_CODE (SET_SRC (next)) == LABEL_REF)
581 printf (" emit_barrier ();");
584 /* Call `gen_sequence' to make a SEQUENCE out of all the
585 insns emitted within this gen_... function. */
587 printf (" _val = gen_sequence ();\n");
588 printf (" end_sequence ();\n");
589 printf (" return _val;\n}\n\n");
592 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
593 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
594 the end of the vector. */
597 output_add_clobbers ()
599 struct clobber_pat *clobber;
600 struct clobber_ent *ent;
603 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
604 printf (" rtx pattern;\n int insn_code_number;\n");
606 printf (" int i;\n\n");
607 printf (" switch (insn_code_number)\n");
610 for (clobber = clobber_list; clobber; clobber = clobber->next)
612 for (ent = clobber->insns; ent; ent = ent->next)
613 printf (" case %d:\n", ent->code_number);
615 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
617 printf (" XVECEXP (pattern, 0, %d) = ", i);
618 gen_exp (XVECEXP (clobber->pattern, 1, i));
622 printf (" break;\n\n");
625 printf (" default:\n");
626 printf (" abort ();\n");
631 /* Write a function, init_mov_optab, that is called to set up entries
632 in mov_optab for EXTRA_CC_MODES. */
635 output_init_mov_optab ()
637 #ifdef EXTRA_CC_NAMES
638 static char *cc_names[] = { EXTRA_CC_NAMES };
642 printf ("\nvoid\ninit_mov_optab ()\n{\n");
644 for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
646 printf ("#ifdef HAVE_mov");
647 for (p = cc_names[i]; *p; p++)
648 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
650 printf (" if (HAVE_mov");
651 for (p = cc_names[i]; *p; p++)
652 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
654 printf (" mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
656 for (p = cc_names[i]; *p; p++)
657 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
658 printf (";\n#endif\n");
669 register char *val = (char *) malloc (size);
672 fatal ("virtual memory exhausted");
682 char *result = (char *) realloc (ptr, size);
684 fatal ("virtual memory exhausted");
692 fprintf (stderr, "genemit: ");
693 fprintf (stderr, s, a1, a2);
694 fprintf (stderr, "\n");
695 exit (FATAL_EXIT_CODE);
698 /* More 'friendly' abort that prints the line and file.
699 config.h can #define abort fancy_abort if you like that sort of thing. */
704 fatal ("Internal gcc abort.");
716 obstack_init (rtl_obstack);
719 fatal ("No input file name.");
721 infile = fopen (argv[1], "r");
725 exit (FATAL_EXIT_CODE);
730 /* Assign sequential codes to all entries in the machine description
731 in parallel with the tables in insn-output.c. */
733 insn_code_number = 0;
734 insn_index_number = 0;
736 printf ("/* Generated automatically by the program `genemit'\n\
737 from the machine description file `md'. */\n\n");
739 printf ("#include \"config.h\"\n");
740 printf ("#include <stdio.h>\n");
741 printf ("#include \"rtl.h\"\n");
742 printf ("#include \"expr.h\"\n");
743 printf ("#include \"real.h\"\n");
744 printf ("#include \"flags.h\"\n");
745 printf ("#include \"output.h\"\n");
746 printf ("#include \"insn-config.h\"\n\n");
747 printf ("#include \"insn-flags.h\"\n\n");
748 printf ("#include \"insn-codes.h\"\n\n");
749 printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
750 printf ("extern rtx recog_operand[];\n");
751 printf ("#define operands emit_operand\n\n");
752 printf ("#define FAIL {end_sequence (); return _val;}\n");
753 printf ("#define DONE {_val = gen_sequence (); end_sequence (); return _val;}\n");
755 /* Read the machine description. */
759 c = read_skip_spaces (infile);
764 desc = read_rtx (infile);
765 if (GET_CODE (desc) == DEFINE_INSN)
770 if (GET_CODE (desc) == DEFINE_EXPAND)
775 if (GET_CODE (desc) == DEFINE_SPLIT)
780 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
787 /* Write out the routine to add CLOBBERs to a pattern. */
788 output_add_clobbers ();
790 /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES. */
791 output_init_mov_optab ();
794 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);