1 /* Generate code from machine description to emit insns as rtl.
2 Copyright (C) 1987, 88, 91, 94, 95, 1997 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)", 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. */
235 printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
237 fmt = GET_RTX_FORMAT (code);
238 len = GET_RTX_LENGTH (code);
239 for (i = 0; i < len; i++)
244 if (fmt[i] == 'e' || fmt[i] == 'u')
245 gen_exp (XEXP (x, i));
246 else if (fmt[i] == 'i')
247 printf ("%u", XINT (x, i));
248 else if (fmt[i] == 's')
249 printf ("\"%s\"", XSTR (x, i));
250 else if (fmt[i] == 'E')
253 printf ("gen_rtvec (%d", XVECLEN (x, i));
254 for (j = 0; j < XVECLEN (x, i); j++)
257 gen_exp (XVECEXP (x, i, j));
267 /* Generate the `gen_...' function for a DEFINE_INSN. */
276 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
277 registers or MATCH_SCRATCHes. If so, store away the information for
282 for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
283 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER
284 || (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != REG
285 && GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH))
288 if (i != XVECLEN (insn, 1) - 1)
290 register struct clobber_pat *p;
291 register struct clobber_ent *link
292 = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
295 link->code_number = insn_code_number;
297 /* See if any previous CLOBBER_LIST entry is the same as this
300 for (p = clobber_list; p; p = p->next)
302 if (p->first_clobber != i + 1
303 || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
306 for (j = i + 1; j < XVECLEN (insn, 1); j++)
308 rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
309 rtx new = XEXP (XVECEXP (insn, 1, j), 0);
311 /* OLD and NEW are the same if both are to be a SCRATCH
313 or if both are registers of the same mode and number. */
314 if (! (GET_MODE (old) == GET_MODE (new)
315 && ((GET_CODE (old) == MATCH_SCRATCH
316 && GET_CODE (new) == MATCH_SCRATCH)
317 || (GET_CODE (old) == REG && GET_CODE (new) == REG
318 && REGNO (old) == REGNO (new)))))
322 if (j == XVECLEN (insn, 1))
328 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
332 p->first_clobber = i + 1;
333 p->next = clobber_list;
337 link->next = p->insns;
342 /* Don't mention instructions whose names are the null string
343 or begin with '*'. They are in the machine description just
345 if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
348 /* Find out how many operands this function has,
349 and also whether any of them have register constraints. */
350 register_constraints = 0;
351 operands = max_operand_vec (insn, 1);
352 if (max_dup_opno >= operands)
353 fatal ("match_dup operand number has no match_operand");
355 /* Output the function name and argument declarations. */
356 printf ("rtx\ngen_%s (", XSTR (insn, 0));
357 for (i = 0; i < operands; i++)
358 printf (i ? ", operand%d" : "operand%d", i);
360 for (i = 0; i < operands; i++)
361 printf (" rtx operand%d;\n", i);
364 /* Output code to construct and return the rtl for the instruction body */
366 if (XVECLEN (insn, 1) == 1)
369 gen_exp (XVECEXP (insn, 1, 0));
374 printf (" return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", XVECLEN (insn, 1));
375 for (i = 0; i < XVECLEN (insn, 1); i++)
378 gen_exp (XVECEXP (insn, 1, i));
380 printf ("));\n}\n\n");
384 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
393 if (strlen (XSTR (expand, 0)) == 0)
394 fatal ("define_expand lacks a name");
395 if (XVEC (expand, 1) == 0)
396 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
398 /* Find out how many operands this function has,
399 and also whether any of them have register constraints. */
400 register_constraints = 0;
402 operands = max_operand_vec (expand, 1);
404 /* Output the function name and argument declarations. */
405 printf ("rtx\ngen_%s (", XSTR (expand, 0));
406 for (i = 0; i < operands; i++)
407 printf (i ? ", operand%d" : "operand%d", i);
409 for (i = 0; i < operands; i++)
410 printf (" rtx operand%d;\n", i);
413 /* If we don't have any C code to write, only one insn is being written,
414 and no MATCH_DUPs are present, we can just return the desired insn
415 like we do for a DEFINE_INSN. This saves memory. */
416 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
417 && operands > max_dup_opno
418 && XVECLEN (expand, 1) == 1)
421 gen_exp (XVECEXP (expand, 1, 0));
426 /* For each operand referred to only with MATCH_DUPs,
427 make a local variable. */
428 for (i = operands; i <= max_dup_opno; i++)
429 printf (" rtx operand%d;\n", i);
430 if (operands > 0 || max_dup_opno >= 0)
431 printf (" rtx operands[%d];\n", MAX (operands, max_dup_opno + 1));
432 printf (" rtx _val = 0;\n");
433 printf (" start_sequence ();\n");
435 /* The fourth operand of DEFINE_EXPAND is some code to be executed
436 before the actual construction.
437 This code expects to refer to `operands'
438 just as the output-code in a DEFINE_INSN does,
439 but here `operands' is an automatic array.
440 So copy the operand values there before executing it. */
441 if (XSTR (expand, 3) && *XSTR (expand, 3))
443 /* Output code to copy the arguments into `operands'. */
444 for (i = 0; i < operands; i++)
445 printf (" operands[%d] = operand%d;\n", i, i);
447 /* Output the special code to be executed before the sequence
449 printf ("%s\n", XSTR (expand, 3));
451 /* Output code to copy the arguments back out of `operands'
452 (unless we aren't going to use them at all). */
453 if (XVEC (expand, 1) != 0)
455 for (i = 0; i < operands; i++)
456 printf (" operand%d = operands[%d];\n", i, i);
457 for (; i <= max_dup_opno; i++)
458 printf (" operand%d = operands[%d];\n", i, i);
462 /* Output code to construct the rtl for the instruction bodies.
463 Use emit_insn to add them to the sequence being accumulated.
464 But don't do this if the user's code has set `no_more' nonzero. */
466 for (i = 0; i < XVECLEN (expand, 1); i++)
468 rtx next = XVECEXP (expand, 1, i);
469 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
470 || (GET_CODE (next) == PARALLEL
471 && GET_CODE (XVECEXP (next, 0, 0)) == SET
472 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
473 || GET_CODE (next) == RETURN)
474 printf (" emit_jump_insn (");
475 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
476 || GET_CODE (next) == CALL
477 || (GET_CODE (next) == PARALLEL
478 && GET_CODE (XVECEXP (next, 0, 0)) == SET
479 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
480 || (GET_CODE (next) == PARALLEL
481 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
482 printf (" emit_call_insn (");
483 else if (GET_CODE (next) == CODE_LABEL)
484 printf (" emit_label (");
485 else if (GET_CODE (next) == MATCH_OPERAND
486 || GET_CODE (next) == MATCH_OPERATOR
487 || GET_CODE (next) == MATCH_PARALLEL
488 || GET_CODE (next) == MATCH_OP_DUP
489 || GET_CODE (next) == MATCH_DUP
490 || GET_CODE (next) == PARALLEL)
493 printf (" emit_insn (");
496 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
497 && GET_CODE (SET_SRC (next)) == LABEL_REF)
498 printf (" emit_barrier ();");
501 /* Call `gen_sequence' to make a SEQUENCE out of all the
502 insns emitted within this gen_... function. */
504 printf (" _done:\n");
505 printf (" _val = gen_sequence ();\n");
506 printf (" _fail:\n");
507 printf (" end_sequence ();\n");
508 printf (" return _val;\n}\n\n");
511 /* Like gen_expand, but generates a SEQUENCE. */
520 if (XVEC (split, 0) == 0)
521 fatal ("define_split (definition %d) lacks a pattern", insn_index_number);
522 else if (XVEC (split, 2) == 0)
523 fatal ("define_split (definition %d) lacks a replacement pattern",
526 /* Find out how many operands this function has. */
528 max_operand_vec (split, 2);
529 operands = MAX (max_opno, max_dup_opno) + 1;
531 /* Output the function name and argument declarations. */
532 printf ("rtx\ngen_split_%d (operands)\n rtx *operands;\n",
536 /* Declare all local variables. */
537 for (i = 0; i < operands; i++)
538 printf (" rtx operand%d;\n", i);
539 printf (" rtx _val = 0;\n");
540 printf (" start_sequence ();\n");
542 /* The fourth operand of DEFINE_SPLIT is some code to be executed
543 before the actual construction. */
546 printf ("%s\n", XSTR (split, 3));
548 /* Output code to copy the arguments back out of `operands' */
549 for (i = 0; i < operands; i++)
550 printf (" operand%d = operands[%d];\n", i, i);
552 /* Output code to construct the rtl for the instruction bodies.
553 Use emit_insn to add them to the sequence being accumulated.
554 But don't do this if the user's code has set `no_more' nonzero. */
556 for (i = 0; i < XVECLEN (split, 2); i++)
558 rtx next = XVECEXP (split, 2, i);
559 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
560 || (GET_CODE (next) == PARALLEL
561 && GET_CODE (XVECEXP (next, 0, 0)) == SET
562 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
563 || GET_CODE (next) == RETURN)
564 printf (" emit_jump_insn (");
565 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
566 || GET_CODE (next) == CALL
567 || (GET_CODE (next) == PARALLEL
568 && GET_CODE (XVECEXP (next, 0, 0)) == SET
569 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
570 || (GET_CODE (next) == PARALLEL
571 && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
572 printf (" emit_call_insn (");
573 else if (GET_CODE (next) == CODE_LABEL)
574 printf (" emit_label (");
575 else if (GET_CODE (next) == MATCH_OPERAND
576 || GET_CODE (next) == MATCH_OPERATOR
577 || GET_CODE (next) == MATCH_PARALLEL
578 || GET_CODE (next) == MATCH_OP_DUP
579 || GET_CODE (next) == MATCH_DUP
580 || GET_CODE (next) == PARALLEL)
583 printf (" emit_insn (");
586 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
587 && GET_CODE (SET_SRC (next)) == LABEL_REF)
588 printf (" emit_barrier ();");
591 /* Call `gen_sequence' to make a SEQUENCE out of all the
592 insns emitted within this gen_... function. */
594 printf (" _done:\n");
595 printf (" _val = gen_sequence ();\n");
596 printf (" _fail:\n");
597 printf (" end_sequence ();\n");
598 printf (" return _val;\n}\n\n");
601 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
602 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
603 the end of the vector. */
606 output_add_clobbers ()
608 struct clobber_pat *clobber;
609 struct clobber_ent *ent;
612 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
613 printf (" rtx pattern;\n int insn_code_number;\n");
615 printf (" int i;\n\n");
616 printf (" switch (insn_code_number)\n");
619 for (clobber = clobber_list; clobber; clobber = clobber->next)
621 for (ent = clobber->insns; ent; ent = ent->next)
622 printf (" case %d:\n", ent->code_number);
624 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
626 printf (" XVECEXP (pattern, 0, %d) = ", i);
627 gen_exp (XVECEXP (clobber->pattern, 1, i));
631 printf (" break;\n\n");
634 printf (" default:\n");
635 printf (" abort ();\n");
640 /* Write a function, init_mov_optab, that is called to set up entries
641 in mov_optab for EXTRA_CC_MODES. */
644 output_init_mov_optab ()
646 #ifdef EXTRA_CC_NAMES
647 static char *cc_names[] = { EXTRA_CC_NAMES };
651 printf ("\nvoid\ninit_mov_optab ()\n{\n");
653 for (i = 0; i < sizeof cc_names / sizeof cc_names[0]; i++)
655 printf ("#ifdef HAVE_mov");
656 for (p = cc_names[i]; *p; p++)
657 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
659 printf (" if (HAVE_mov");
660 for (p = cc_names[i]; *p; p++)
661 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
663 printf (" mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
665 for (p = cc_names[i]; *p; p++)
666 printf ("%c", *p >= 'A' && *p <= 'Z' ? *p - 'A' + 'a' : *p);
667 printf (";\n#endif\n");
678 register char *val = (char *) malloc (size);
681 fatal ("virtual memory exhausted");
691 char *result = (char *) realloc (ptr, size);
693 fatal ("virtual memory exhausted");
701 fprintf (stderr, "genemit: ");
702 fprintf (stderr, s, a1, a2);
703 fprintf (stderr, "\n");
704 exit (FATAL_EXIT_CODE);
707 /* More 'friendly' abort that prints the line and file.
708 config.h can #define abort fancy_abort if you like that sort of thing. */
713 fatal ("Internal gcc abort.");
725 obstack_init (rtl_obstack);
728 fatal ("No input file name.");
730 infile = fopen (argv[1], "r");
734 exit (FATAL_EXIT_CODE);
739 /* Assign sequential codes to all entries in the machine description
740 in parallel with the tables in insn-output.c. */
742 insn_code_number = 0;
743 insn_index_number = 0;
745 printf ("/* Generated automatically by the program `genemit'\n\
746 from the machine description file `md'. */\n\n");
748 printf ("#include \"config.h\"\n");
749 printf ("#include <stdio.h>\n");
750 printf ("#include \"rtl.h\"\n");
751 printf ("#include \"expr.h\"\n");
752 printf ("#include \"real.h\"\n");
753 printf ("#include \"flags.h\"\n");
754 printf ("#include \"output.h\"\n");
755 printf ("#include \"insn-config.h\"\n\n");
756 printf ("#include \"insn-flags.h\"\n\n");
757 printf ("#include \"insn-codes.h\"\n\n");
758 printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
759 printf ("extern rtx recog_operand[];\n");
760 printf ("#define operands emit_operand\n\n");
761 printf ("#define FAIL goto _fail\n\n");
762 printf ("#define DONE goto _done\n\n");
764 /* Read the machine description. */
768 c = read_skip_spaces (infile);
773 desc = read_rtx (infile);
774 if (GET_CODE (desc) == DEFINE_INSN)
779 if (GET_CODE (desc) == DEFINE_EXPAND)
784 if (GET_CODE (desc) == DEFINE_SPLIT)
789 if (GET_CODE (desc) == DEFINE_PEEPHOLE)
796 /* Write out the routine to add CLOBBERs to a pattern. */
797 output_add_clobbers ();
799 /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES. */
800 output_init_mov_optab ();
803 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);