1 /* Generate code from machine description to emit insns as rtl.
2 Copyright (C) 1987, 1988, 1991, 1994, 1995 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
34 extern rtx read_rtx ();
41 static int max_dup_opno;
42 static int register_constraints;
43 static int insn_code_number;
44 static int insn_index_number;
46 /* Data structure for recording the patterns of insns that have CLOBBERs.
47 We use this to output a function that adds these CLOBBERs to a
48 previously-allocated PARALLEL expression. */
52 struct clobber_ent *insns;
55 struct clobber_pat *next;
58 /* Records one insn that uses the clobber list. */
62 int code_number; /* Counts only insns. */
63 struct clobber_ent *next;
70 register RTX_CODE code;
80 if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
81 register_constraints = 1;
82 if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
83 register_constraints = 1;
84 if (code == MATCH_OPERAND || code == MATCH_OPERATOR
85 || code == MATCH_PARALLEL)
86 max_opno = MAX (max_opno, XINT (x, 0));
87 if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
88 max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
90 fmt = GET_RTX_FORMAT (code);
91 len = GET_RTX_LENGTH (code);
92 for (i = 0; i < len; i++)
94 if (fmt[i] == 'e' || fmt[i] == 'u')
95 max_operand_1 (XEXP (x, i));
96 else if (fmt[i] == 'E')
99 for (j = 0; j < XVECLEN (x, i); j++)
100 max_operand_1 (XVECEXP (x, i, j));
106 max_operand_vec (insn, arg)
110 register int len = XVECLEN (insn, arg);
116 for (i = 0; i < len; i++)
117 max_operand_1 (XVECEXP (insn, arg, i));
127 for (p1 = GET_RTX_NAME (code); *p1; p1++)
129 if (*p1 >= 'a' && *p1 <= 'z')
130 putchar (*p1 + 'A' - 'a');
136 /* Print a C expression to construct an RTX just like X,
137 substituting any operand references appearing within. */
143 register RTX_CODE code;
160 printf ("operand%d", XINT (x, 0));
164 printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
165 XINT (x, 0), XINT (x, 0));
166 for (i = 0; i < XVECLEN (x, 1); i++)
169 gen_exp (XVECEXP (x, 1, i));
175 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
176 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
177 for (i = 0; i < XVECLEN (x, 2); i++)
180 gen_exp (XVECEXP (x, 2, i));
187 printf ("operand%d", XINT (x, 0));
191 printf ("gen_rtx (SCRATCH, %smode, 0)", GET_MODE_NAME (GET_MODE (x)));
195 fatal ("ADDRESS expression code used in named instruction pattern");
207 printf ("const0_rtx");
208 else if (INTVAL (x) == 1)
209 printf ("const1_rtx");
210 else if (INTVAL (x) == -1)
211 printf ("constm1_rtx");
212 else if (INTVAL (x) == STORE_FLAG_VALUE)
213 printf ("const_true_rtx");
216 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
225 /* These shouldn't be written in MD files. Instead, the appropriate
226 routines in varasm.c should be called. */
230 printf ("gen_rtx (");
232 printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
234 fmt = GET_RTX_FORMAT (code);
235 len = GET_RTX_LENGTH (code);
236 for (i = 0; i < len; i++)
241 if (fmt[i] == 'e' || fmt[i] == 'u')
242 gen_exp (XEXP (x, i));
243 else if (fmt[i] == 'i')
244 printf ("%u", XINT (x, i));
245 else if (fmt[i] == 's')
246 printf ("\"%s\"", XSTR (x, i));
247 else if (fmt[i] == 'E')
250 printf ("gen_rtvec (%d", XVECLEN (x, i));
251 for (j = 0; j < XVECLEN (x, i); j++)
254 gen_exp (XVECEXP (x, i, j));
264 /* Generate the `gen_...' function for a DEFINE_INSN. */
273 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
274 registers or MATCH_SCRATCHes. If so, store away the information for
279 for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
280 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
281 || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
282 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
285 if (i != XVECLEN (insn, 1) - 1)
287 register struct clobber_pat *p;
288 register struct clobber_ent *link
289 = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
292 link->code_number = insn_code_number;
294 /* See if any previous CLOBBER_LIST entry is the same as this
297 for (p = clobber_list; p; p = p->next)
299 if (p->first_clobber != i + 1
300 || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
303 for (j = i + 1; j < XVECLEN (insn, 1); j++)
305 rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
306 rtx new = XEXP (XVECEXP (insn, 1, j), 0);
308 /* OLD and NEW are the same if both are to be a SCRATCH
310 or if both are registers of the same mode and number. */
311 if (! (GET_MODE (old) == GET_MODE (new)
312 && ((GET_CODE (old) == MATCH_SCRATCH
313 && GET_CODE (new) == MATCH_SCRATCH)
314 || (GET_CODE (old) == REG && GET_CODE (new) == REG
315 && REGNO (old) == REGNO (new)))))
319 if (j == XVECLEN (insn, 1))
325 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
329 p->first_clobber = i + 1;
330 p->next = clobber_list;
334 link->next = p->insns;
339 /* Don't mention instructions whose names are the null string
340 or begin with '*'. They are in the machine description just
342 if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
345 /* Find out how many operands this function has,
346 and also whether any of them have register constraints. */
347 register_constraints = 0;
348 operands = max_operand_vec (insn, 1);
349 if (max_dup_opno >= operands)
350 fatal ("match_dup operand number has no match_operand");
352 /* Output the function name and argument declarations. */
353 printf ("rtx\ngen_%s (", XSTR (insn, 0));
354 for (i = 0; i < operands; i++)
355 printf (i ? ", operand%d" : "operand%d", i);
357 for (i = 0; i < operands; i++)
358 printf (" rtx operand%d;\n", i);
361 /* Output code to construct and return the rtl for the instruction body */
363 if (XVECLEN (insn, 1) == 1)
366 gen_exp (XVECEXP (insn, 1, 0));
371 printf (" return gen_rtx (PARALLEL, VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
372 for (i = 0; i < XVECLEN (insn, 1); i++)
375 gen_exp (XVECEXP (insn, 1, i));
377 printf ("));\n}\n\n");
381 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
390 if (strlen (XSTR (expand, 0)) == 0)
391 fatal ("define_expand lacks a name");
392 if (XVEC (expand, 1) == 0)
393 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
395 /* Find out how many operands this function has,
396 and also whether any of them have register constraints. */
397 register_constraints = 0;
399 operands = max_operand_vec (expand, 1);
401 /* Output the function name and argument declarations. */
402 printf ("rtx\ngen_%s (", XSTR (expand, 0));
403 for (i = 0; i < operands; i++)
404 printf (i ? ", operand%d" : "operand%d", i);
406 for (i = 0; i < operands; i++)
407 printf (" rtx operand%d;\n", i);
410 /* If we don't have any C code to write, only one insn is being written,
411 and no MATCH_DUPs are present, we can just return the desired insn
412 like we do for a DEFINE_INSN. This saves memory. */
413 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
414 && operands > max_dup_opno
415 && XVECLEN (expand, 1) == 1)
418 gen_exp (XVECEXP (expand, 1, 0));
423 /* For each operand referred to only with MATCH_DUPs,
424 make a local variable. */
425 for (i = operands; i <= max_dup_opno; i++)
426 printf (" rtx operand%d;\n", i);
427 if (operands > 0 || max_dup_opno >= 0)
428 printf (" rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
429 printf (" rtx _val = 0;\n");
430 printf (" start_sequence ();\n");
432 /* The fourth operand of DEFINE_EXPAND is some code to be executed
433 before the actual construction.
434 This code expects to refer to `operands'
435 just as the output-code in a DEFINE_INSN does,
436 but here `operands' is an automatic array.
437 So copy the operand values there before executing it. */
438 if (XSTR (expand, 3) && *XSTR (expand, 3))
440 /* Output code to copy the arguments into `operands'. */
441 for (i = 0; i < operands; i++)
442 printf (" operands[%d] = operand%d;\n", i, i);
444 /* Output the special code to be executed before the sequence
446 printf ("%s\n", XSTR (expand, 3));
448 /* Output code to copy the arguments back out of `operands'
449 (unless we aren't going to use them at all). */
450 if (XVEC (expand, 1) != 0)
452 for (i = 0; i < operands; i++)
453 printf (" operand%d = operands[%d];\n", i, i);
454 for (; i <= max_dup_opno; i++)
455 printf (" operand%d = operands[%d];\n", i, i);
459 /* Output code to construct the rtl for the instruction bodies.
460 Use emit_insn to add them to the sequence being accumulated.
461 But don't do this if the user's code has set `no_more' nonzero. */
463 for (i = 0; i < XVECLEN (expand, 1); i++)
465 rtx next = XVECEXP (expand, 1, i);
466 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
467 || (GET_CODE (next) == PARALLEL
468 && GET_CODE (XVECEXP (next, 0, 0)) == SET
469 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
470 || GET_CODE (next) == RETURN)
471 printf (" emit_jump_insn (");
472 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
473 || GET_CODE (next) == CALL
474 || (GET_CODE (next) == PARALLEL
475 && GET_CODE (XVECEXP (next, 0, 0)) == SET
476 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
477 || (GET_CODE (next) == PARALLEL
478 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
479 printf (" emit_call_insn (");
480 else if (GET_CODE (next) == CODE_LABEL)
481 printf (" emit_label (");
482 else if (GET_CODE (next) == MATCH_OPERAND
483 || GET_CODE (next) == MATCH_OPERATOR
484 || GET_CODE (next) == MATCH_PARALLEL
485 || GET_CODE (next) == MATCH_OP_DUP
486 || GET_CODE (next) == MATCH_DUP
487 || GET_CODE (next) == PARALLEL)
490 printf (" emit_insn (");
493 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
494 && GET_CODE (SET_SRC (next)) == LABEL_REF)
495 printf (" emit_barrier ();");
498 /* Call `gen_sequence' to make a SEQUENCE out of all the
499 insns emitted within this gen_... function. */
501 printf (" _done:\n");
502 printf (" _val = gen_sequence ();\n");
503 printf (" _fail:\n");
504 printf (" end_sequence ();\n");
505 printf (" return _val;\n}\n\n");
508 /* Like gen_expand, but generates a SEQUENCE. */
516 if (XVEC (split, 0) == 0)
517 fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
518 else if (XVEC (split, 2) == 0)
519 fatal ("define_split (definition %d) lacks a replacement pattern",
522 /* Find out how many operands this function has. */
524 max_operand_vec (split, 2);
525 operands = MAX (max_opno, max_dup_opno) + 1;
527 /* Output the function name and argument declarations. */
528 printf ("rtx\ngen_split_%d (operands)\n rtx *operands;\n",
532 /* Declare all local variables. */
533 for (i = 0; i < operands; i++)
534 printf (" rtx operand%d;\n", i);
535 printf (" rtx _val = 0;\n");
536 printf (" start_sequence ();\n");
538 /* The fourth operand of DEFINE_SPLIT is some code to be executed
539 before the actual construction. */
542 printf ("%s\n", XSTR (split, 3));
544 /* Output code to copy the arguments back out of `operands' */
545 for (i = 0; i < operands; i++)
546 printf (" operand%d = operands[%d];\n", i, i);
548 /* Output code to construct the rtl for the instruction bodies.
549 Use emit_insn to add them to the sequence being accumulated.
550 But don't do this if the user's code has set `no_more' nonzero. */
552 for (i = 0; i < XVECLEN (split, 2); i++)
554 rtx next = XVECEXP (split, 2, i);
555 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
556 || (GET_CODE (next) == PARALLEL
557 && GET_CODE (XVECEXP (next, 0, 0)) == SET
558 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
559 || GET_CODE (next) == RETURN)
560 printf (" emit_jump_insn (");
561 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
562 || GET_CODE (next) == CALL
563 || (GET_CODE (next) == PARALLEL
564 && GET_CODE (XVECEXP (next, 0, 0)) == SET
565 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
566 || (GET_CODE (next) == PARALLEL
567 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
568 printf (" emit_call_insn (");
569 else if (GET_CODE (next) == CODE_LABEL)
570 printf (" emit_label (");
571 else if (GET_CODE (next) == MATCH_OPERAND
572 || GET_CODE (next) == MATCH_OPERATOR
573 || GET_CODE (next) == MATCH_PARALLEL
574 || GET_CODE (next) == MATCH_OP_DUP
575 || GET_CODE (next) == MATCH_DUP
576 || GET_CODE (next) == PARALLEL)
579 printf (" emit_insn (");
582 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
583 && GET_CODE (SET_SRC (next)) == LABEL_REF)
584 printf (" emit_barrier ();");
587 /* Call `gen_sequence' to make a SEQUENCE out of all the
588 insns emitted within this gen_... function. */
590 printf (" _done:\n");
591 printf (" _val = gen_sequence ();\n");
592 printf (" _fail:\n");
593 printf (" end_sequence ();\n");
594 printf (" return _val;\n}\n\n");
597 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
598 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
599 the end of the vector. */
602 output_add_clobbers ()
604 struct clobber_pat *clobber;
605 struct clobber_ent *ent;
608 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
609 printf (" rtx pattern;\n int insn_code_number;\n");
611 printf (" int i;\n\n");
612 printf (" switch (insn_code_number)\n");
615 for (clobber = clobber_list; clobber; clobber = clobber->next)
617 for (ent = clobber->insns; ent; ent = ent->next)
618 printf (" case %d:\n", ent->code_number);
620 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
622 printf (" XVECEXP (pattern, 0, %d) = ", i);
623 gen_exp (XVECEXP (clobber->pattern, 1, i));
627 printf (" break;\n\n");
630 printf (" default:\n");
631 printf (" abort ();\n");
636 /* Write a function, init_mov_optab, that is called to set up entries
637 in mov_optab for EXTRA_CC_MODES. */
640 output_init_mov_optab ()
642 #ifdef EXTRA_CC_NAMES
643 static char *cc_names[] = { EXTRA_CC_NAMES };
647 printf ("\nvoid\ninit_mov_optab ()\n{\n");
649 for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
651 printf ("#ifdef HAVE_mov");
652 for (p = cc_names[i]; *p; p++)
653 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
655 printf (" if (HAVE_mov");
656 for (p = cc_names[i]; *p; p++)
657 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
659 printf (" mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
661 for (p = cc_names[i]; *p; p++)
662 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
663 printf (";\n#endif\n");
674 register char *val = (char *) malloc (size);
677 fatal ("virtual memory exhausted");
687 char *result = (char *) realloc (ptr, size);
689 fatal ("virtual memory exhausted");
697 fprintf (stderr, "genemit: ");
698 fprintf (stderr, s, a1, a2);
699 fprintf (stderr, "\n");
700 exit (FATAL_EXIT_CODE);
703 /* More 'friendly' abort that prints the line and file.
704 config.h can #define abort fancy_abort if you like that sort of thing. */
709 fatal ("Internal gcc abort.");
721 obstack_init (rtl_obstack);
724 fatal ("No input file name.");
726 infile = fopen (argv[1], "r");
730 exit (FATAL_EXIT_CODE);
735 /* Assign sequential codes to all entries in the machine description
736 in parallel with the tables in insn-output.c. */
738 insn_code_number = 0;
739 insn_index_number = 0;
741 printf ("/* Generated automatically by the program `genemit'\n\
742 from the machine description file `md'. */\n\n");
744 printf ("#include \"config.h\"\n");
745 printf ("#include \"rtl.h\"\n");
746 printf ("#include \"expr.h\"\n");
747 printf ("#include \"real.h\"\n");
748 printf ("#include \"output.h\"\n");
749 printf ("#include \"insn-config.h\"\n\n");
750 printf ("#include \"insn-flags.h\"\n\n");
751 printf ("#include \"insn-codes.h\"\n\n");
752 printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
753 printf ("extern rtx recog_operand[];\n");
754 printf ("#define operands emit_operand\n\n");
755 printf ("#define FAIL goto _fail\n\n");
756 printf ("#define DONE goto _done\n\n");
758 /* Read the machine description. */
762 c = read_skip_spaces (infile);
767 desc = read_rtx (infile);
768 if (GET_CODE (desc) == DEFINE_INSN)
773 if (GET_CODE (desc) == DEFINE_EXPAND)
778 if (GET_CODE (desc) == DEFINE_SPLIT)
783 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
790 /* Write out the routine to add CLOBBERs to a pattern. */
791 output_add_clobbers ();
793 /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES. */
794 output_init_mov_optab ();
797 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);