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));
34 static void fatal PVPROTO ((char *, ...))
35 ATTRIBUTE_PRINTF_1 ATTRIBUTE_NORETURN;
36 void fancy_abort PROTO((void)) ATTRIBUTE_NORETURN;
38 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
39 char **insn_name_ptr = 0;
42 static int max_dup_opno;
43 static int register_constraints;
44 static int insn_code_number;
45 static int insn_index_number;
47 /* Data structure for recording the patterns of insns that have CLOBBERs.
48 We use this to output a function that adds these CLOBBERs to a
49 previously-allocated PARALLEL expression. */
53 struct clobber_ent *insns;
56 struct clobber_pat *next;
59 /* Records one insn that uses the clobber list. */
63 int code_number; /* Counts only insns. */
64 struct clobber_ent *next;
67 static void max_operand_1 PROTO((rtx));
68 static int max_operand_vec PROTO((rtx, int));
69 static void print_code PROTO((RTX_CODE));
70 static void gen_exp PROTO((rtx));
71 static void gen_insn PROTO((rtx));
72 static void gen_expand PROTO((rtx));
73 static void gen_split PROTO((rtx));
74 static void output_add_clobbers PROTO((void));
75 static void output_init_mov_optab PROTO((void));
82 register RTX_CODE code;
92 if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
93 register_constraints = 1;
94 if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
95 register_constraints = 1;
96 if (code == MATCH_OPERAND || code == MATCH_OPERATOR
97 || code == MATCH_PARALLEL)
98 max_opno = MAX (max_opno, XINT (x, 0));
99 if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
100 max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
102 fmt = GET_RTX_FORMAT (code);
103 len = GET_RTX_LENGTH (code);
104 for (i = 0; i < len; i++)
106 if (fmt[i] == 'e' || fmt[i] == 'u')
107 max_operand_1 (XEXP (x, i));
108 else if (fmt[i] == 'E')
111 for (j = 0; j < XVECLEN (x, i); j++)
112 max_operand_1 (XVECEXP (x, i, j));
118 max_operand_vec (insn, arg)
122 register int len = XVECLEN (insn, arg);
128 for (i = 0; i < len; i++)
129 max_operand_1 (XVECEXP (insn, arg, i));
139 for (p1 = GET_RTX_NAME (code); *p1; p1++)
141 if (*p1 >= 'a' && *p1 <= 'z')
142 putchar (*p1 + 'A' - 'a');
148 /* Print a C expression to construct an RTX just like X,
149 substituting any operand references appearing within. */
155 register RTX_CODE code;
172 printf ("operand%d", XINT (x, 0));
176 printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
177 if (GET_MODE (x) == VOIDmode)
178 printf ("GET_MODE (operand%d)", XINT (x, 0));
180 printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
181 for (i = 0; i < XVECLEN (x, 1); i++)
184 gen_exp (XVECEXP (x, 1, i));
190 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
191 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
192 for (i = 0; i < XVECLEN (x, 2); i++)
195 gen_exp (XVECEXP (x, 2, i));
202 printf ("operand%d", XINT (x, 0));
206 printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
210 fatal ("ADDRESS expression code used in named instruction pattern");
222 printf ("const0_rtx");
223 else if (INTVAL (x) == 1)
224 printf ("const1_rtx");
225 else if (INTVAL (x) == -1)
226 printf ("constm1_rtx");
227 else if (INTVAL (x) == STORE_FLAG_VALUE)
228 printf ("const_true_rtx");
231 printf ("GEN_INT (");
232 printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
238 /* These shouldn't be written in MD files. Instead, the appropriate
239 routines in varasm.c should be called. */
248 printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
250 fmt = GET_RTX_FORMAT (code);
251 len = GET_RTX_LENGTH (code);
252 for (i = 0; i < len; i++)
257 if (fmt[i] == 'e' || fmt[i] == 'u')
258 gen_exp (XEXP (x, i));
259 else if (fmt[i] == 'i')
260 printf ("%u", XINT (x, i));
261 else if (fmt[i] == 's')
262 printf ("\"%s\"", XSTR (x, i));
263 else if (fmt[i] == 'E')
266 printf ("gen_rtvec (%d", XVECLEN (x, i));
267 for (j = 0; j < XVECLEN (x, i); j++)
270 gen_exp (XVECEXP (x, i, j));
280 /* Generate the `gen_...' function for a DEFINE_INSN. */
289 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
290 registers or MATCH_SCRATCHes. If so, store away the information for
295 for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
296 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
297 || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
298 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
301 if (i != XVECLEN (insn, 1) - 1)
303 register struct clobber_pat *p;
304 register struct clobber_ent *link
305 = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
308 link->code_number = insn_code_number;
310 /* See if any previous CLOBBER_LIST entry is the same as this
313 for (p = clobber_list; p; p = p->next)
315 if (p->first_clobber != i + 1
316 || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
319 for (j = i + 1; j < XVECLEN (insn, 1); j++)
321 rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
322 rtx new = XEXP (XVECEXP (insn, 1, j), 0);
324 /* OLD and NEW are the same if both are to be a SCRATCH
326 or if both are registers of the same mode and number. */
327 if (! (GET_MODE (old) == GET_MODE (new)
328 && ((GET_CODE (old) == MATCH_SCRATCH
329 && GET_CODE (new) == MATCH_SCRATCH)
330 || (GET_CODE (old) == REG && GET_CODE (new) == REG
331 && REGNO (old) == REGNO (new)))))
335 if (j == XVECLEN (insn, 1))
341 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
345 p->first_clobber = i + 1;
346 p->next = clobber_list;
350 link->next = p->insns;
355 /* Don't mention instructions whose names are the null string
356 or begin with '*'. They are in the machine description just
358 if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
361 /* Find out how many operands this function has,
362 and also whether any of them have register constraints. */
363 register_constraints = 0;
364 operands = max_operand_vec (insn, 1);
365 if (max_dup_opno >= operands)
366 fatal ("match_dup operand number has no match_operand");
368 /* Output the function name and argument declarations. */
369 printf ("rtx\ngen_%s (", XSTR (insn, 0));
370 for (i = 0; i < operands; i++)
371 printf (i ? ", operand%d" : "operand%d", i);
373 for (i = 0; i < operands; i++)
374 printf (" rtx operand%d;\n", i);
377 /* Output code to construct and return the rtl for the instruction body */
379 if (XVECLEN (insn, 1) == 1)
382 gen_exp (XVECEXP (insn, 1, 0));
387 printf (" return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
388 for (i = 0; i < XVECLEN (insn, 1); i++)
391 gen_exp (XVECEXP (insn, 1, i));
393 printf ("));\n}\n\n");
397 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
406 if (strlen (XSTR (expand, 0)) == 0)
407 fatal ("define_expand lacks a name");
408 if (XVEC (expand, 1) == 0)
409 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
411 /* Find out how many operands this function has,
412 and also whether any of them have register constraints. */
413 register_constraints = 0;
415 operands = max_operand_vec (expand, 1);
417 /* Output the function name and argument declarations. */
418 printf ("rtx\ngen_%s (", XSTR (expand, 0));
419 for (i = 0; i < operands; i++)
420 printf (i ? ", operand%d" : "operand%d", i);
422 for (i = 0; i < operands; i++)
423 printf (" rtx operand%d;\n", i);
426 /* If we don't have any C code to write, only one insn is being written,
427 and no MATCH_DUPs are present, we can just return the desired insn
428 like we do for a DEFINE_INSN. This saves memory. */
429 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
430 && operands > max_dup_opno
431 && XVECLEN (expand, 1) == 1)
434 gen_exp (XVECEXP (expand, 1, 0));
439 /* For each operand referred to only with MATCH_DUPs,
440 make a local variable. */
441 for (i = operands; i <= max_dup_opno; i++)
442 printf (" rtx operand%d;\n", i);
443 if (operands > 0 || max_dup_opno >= 0)
444 printf (" rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
445 printf (" rtx _val = 0;\n");
446 printf (" start_sequence ();\n");
448 /* The fourth operand of DEFINE_EXPAND is some code to be executed
449 before the actual construction.
450 This code expects to refer to `operands'
451 just as the output-code in a DEFINE_INSN does,
452 but here `operands' is an automatic array.
453 So copy the operand values there before executing it. */
454 if (XSTR (expand, 3) && *XSTR (expand, 3))
456 /* Output code to copy the arguments into `operands'. */
457 for (i = 0; i < operands; i++)
458 printf (" operands[%d] = operand%d;\n", i, i);
460 /* Output the special code to be executed before the sequence
462 printf ("%s\n", XSTR (expand, 3));
464 /* Output code to copy the arguments back out of `operands'
465 (unless we aren't going to use them at all). */
466 if (XVEC (expand, 1) != 0)
468 for (i = 0; i < operands; i++)
469 printf (" operand%d = operands[%d];\n", i, i);
470 for (; i <= max_dup_opno; i++)
471 printf (" operand%d = operands[%d];\n", i, i);
475 /* Output code to construct the rtl for the instruction bodies.
476 Use emit_insn to add them to the sequence being accumulated.
477 But don't do this if the user's code has set `no_more' nonzero. */
479 for (i = 0; i < XVECLEN (expand, 1); i++)
481 rtx next = XVECEXP (expand, 1, i);
482 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
483 || (GET_CODE (next) == PARALLEL
484 && GET_CODE (XVECEXP (next, 0, 0)) == SET
485 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
486 || GET_CODE (next) == RETURN)
487 printf (" emit_jump_insn (");
488 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
489 || GET_CODE (next) == CALL
490 || (GET_CODE (next) == PARALLEL
491 && GET_CODE (XVECEXP (next, 0, 0)) == SET
492 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
493 || (GET_CODE (next) == PARALLEL
494 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
495 printf (" emit_call_insn (");
496 else if (GET_CODE (next) == CODE_LABEL)
497 printf (" emit_label (");
498 else if (GET_CODE (next) == MATCH_OPERAND
499 || GET_CODE (next) == MATCH_OPERATOR
500 || GET_CODE (next) == MATCH_PARALLEL
501 || GET_CODE (next) == MATCH_OP_DUP
502 || GET_CODE (next) == MATCH_DUP
503 || GET_CODE (next) == PARALLEL)
506 printf (" emit_insn (");
509 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
510 && GET_CODE (SET_SRC (next)) == LABEL_REF)
511 printf (" emit_barrier ();");
514 /* Call `gen_sequence' to make a SEQUENCE out of all the
515 insns emitted within this gen_... function. */
517 printf (" _val = gen_sequence ();\n");
518 printf (" end_sequence ();\n");
519 printf (" return _val;\n}\n\n");
522 /* Like gen_expand, but generates a SEQUENCE. */
531 if (XVEC (split, 0) == 0)
532 fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
533 else if (XVEC (split, 2) == 0)
534 fatal ("define_split (definition %d) lacks a replacement pattern",
537 /* Find out how many operands this function has. */
539 max_operand_vec (split, 2);
540 operands = MAX (max_opno, max_dup_opno) + 1;
542 /* Output the function name and argument declarations. */
543 printf ("rtx\ngen_split_%d (operands)\n rtx *operands;\n",
547 /* Declare all local variables. */
548 for (i = 0; i < operands; i++)
549 printf (" rtx operand%d;\n", i);
550 printf (" rtx _val = 0;\n");
551 printf (" start_sequence ();\n");
553 /* The fourth operand of DEFINE_SPLIT is some code to be executed
554 before the actual construction. */
557 printf ("%s\n", XSTR (split, 3));
559 /* Output code to copy the arguments back out of `operands' */
560 for (i = 0; i < operands; i++)
561 printf (" operand%d = operands[%d];\n", i, i);
563 /* Output code to construct the rtl for the instruction bodies.
564 Use emit_insn to add them to the sequence being accumulated.
565 But don't do this if the user's code has set `no_more' nonzero. */
567 for (i = 0; i < XVECLEN (split, 2); i++)
569 rtx next = XVECEXP (split, 2, i);
570 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
571 || (GET_CODE (next) == PARALLEL
572 && GET_CODE (XVECEXP (next, 0, 0)) == SET
573 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
574 || GET_CODE (next) == RETURN)
575 printf (" emit_jump_insn (");
576 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
577 || GET_CODE (next) == CALL
578 || (GET_CODE (next) == PARALLEL
579 && GET_CODE (XVECEXP (next, 0, 0)) == SET
580 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
581 || (GET_CODE (next) == PARALLEL
582 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
583 printf (" emit_call_insn (");
584 else if (GET_CODE (next) == CODE_LABEL)
585 printf (" emit_label (");
586 else if (GET_CODE (next) == MATCH_OPERAND
587 || GET_CODE (next) == MATCH_OPERATOR
588 || GET_CODE (next) == MATCH_PARALLEL
589 || GET_CODE (next) == MATCH_OP_DUP
590 || GET_CODE (next) == MATCH_DUP
591 || GET_CODE (next) == PARALLEL)
594 printf (" emit_insn (");
597 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
598 && GET_CODE (SET_SRC (next)) == LABEL_REF)
599 printf (" emit_barrier ();");
602 /* Call `gen_sequence' to make a SEQUENCE out of all the
603 insns emitted within this gen_... function. */
605 printf (" _val = gen_sequence ();\n");
606 printf (" end_sequence ();\n");
607 printf (" return _val;\n}\n\n");
610 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
611 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
612 the end of the vector. */
615 output_add_clobbers ()
617 struct clobber_pat *clobber;
618 struct clobber_ent *ent;
621 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
622 printf (" rtx pattern;\n int insn_code_number;\n");
624 printf (" switch (insn_code_number)\n");
627 for (clobber = clobber_list; clobber; clobber = clobber->next)
629 for (ent = clobber->insns; ent; ent = ent->next)
630 printf (" case %d:\n", ent->code_number);
632 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
634 printf (" XVECEXP (pattern, 0, %d) = ", i);
635 gen_exp (XVECEXP (clobber->pattern, 1, i));
639 printf (" break;\n\n");
642 printf (" default:\n");
643 printf (" abort ();\n");
648 /* Write a function, init_mov_optab, that is called to set up entries
649 in mov_optab for EXTRA_CC_MODES. */
652 output_init_mov_optab ()
654 #ifdef EXTRA_CC_NAMES
655 static char *cc_names[] = { EXTRA_CC_NAMES };
659 printf ("\nvoid\ninit_mov_optab ()\n{\n");
661 for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
663 printf ("#ifdef HAVE_mov");
664 for (p = cc_names[i]; *p; p++)
665 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
667 printf (" if (HAVE_mov");
668 for (p = cc_names[i]; *p; p++)
669 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
671 printf (" mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
673 for (p = cc_names[i]; *p; p++)
674 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
675 printf (";\n#endif\n");
686 register char *val = (char *) malloc (size);
689 fatal ("virtual memory exhausted");
699 char *result = (char *) realloc (ptr, size);
701 fatal ("virtual memory exhausted");
706 fatal VPROTO ((char *format, ...))
713 VA_START (ap, format);
716 format = va_arg (ap, char *);
719 fprintf (stderr, "genemit: ");
720 vfprintf (stderr, format, ap);
722 fprintf (stderr, "\n");
723 exit (FATAL_EXIT_CODE);
726 /* More 'friendly' abort that prints the line and file.
727 config.h can #define abort fancy_abort if you like that sort of thing. */
732 fatal ("Internal gcc abort.");
744 obstack_init (rtl_obstack);
747 fatal ("No input file name.");
749 infile = fopen (argv[1], "r");
753 exit (FATAL_EXIT_CODE);
758 /* Assign sequential codes to all entries in the machine description
759 in parallel with the tables in insn-output.c. */
761 insn_code_number = 0;
762 insn_index_number = 0;
764 printf ("/* Generated automatically by the program `genemit'\n\
765 from the machine description file `md'. */\n\n");
767 printf ("#include \"config.h\"\n");
768 printf ("#include \"system.h\"\n");
769 printf ("#include \"rtl.h\"\n");
770 printf ("#include \"expr.h\"\n");
771 printf ("#include \"real.h\"\n");
772 printf ("#include \"flags.h\"\n");
773 printf ("#include \"output.h\"\n");
774 printf ("#include \"insn-config.h\"\n\n");
775 printf ("#include \"insn-flags.h\"\n\n");
776 printf ("#include \"insn-codes.h\"\n\n");
777 printf ("#include \"reload.h\"\n");
778 printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
779 printf ("extern rtx recog_operand[];\n");
780 printf ("#define operands emit_operand\n\n");
781 printf ("#define FAIL return (end_sequence (), _val)\n");
782 printf ("#define DONE return (_val = gen_sequence (), end_sequence (), _val)\n");
784 /* Read the machine description. */
788 c = read_skip_spaces (infile);
793 desc = read_rtx (infile);
794 if (GET_CODE (desc) == DEFINE_INSN)
799 if (GET_CODE (desc) == DEFINE_EXPAND)
804 if (GET_CODE (desc) == DEFINE_SPLIT)
809 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
816 /* Write out the routine to add CLOBBERs to a pattern. */
817 output_add_clobbers ();
819 /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES. */
820 output_init_mov_optab ();
823 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);