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 extern rtx
read_rtx ();
38 void fatal
PVPROTO((char *, ...));
40 /* We must not provide any prototype here, even if ANSI C. */
47 static int max_dup_opno
;
48 static int register_constraints
;
49 static int insn_code_number
;
50 static int insn_index_number
;
52 /* Data structure for recording the patterns of insns that have CLOBBERs.
53 We use this to output a function that adds these CLOBBERs to a
54 previously-allocated PARALLEL expression. */
58 struct clobber_ent
*insns
;
61 struct clobber_pat
*next
;
64 /* Records one insn that uses the clobber list. */
68 int code_number
; /* Counts only insns. */
69 struct clobber_ent
*next
;
76 register RTX_CODE code
;
86 if (code
== MATCH_OPERAND
&& XSTR (x
, 2) != 0 && *XSTR (x
, 2) != '\0')
87 register_constraints
= 1;
88 if (code
== MATCH_SCRATCH
&& XSTR (x
, 1) != 0 && *XSTR (x
, 1) != '\0')
89 register_constraints
= 1;
90 if (code
== MATCH_OPERAND
|| code
== MATCH_OPERATOR
91 || code
== MATCH_PARALLEL
)
92 max_opno
= MAX (max_opno
, XINT (x
, 0));
93 if (code
== MATCH_DUP
|| code
== MATCH_OP_DUP
|| code
== MATCH_PAR_DUP
)
94 max_dup_opno
= MAX (max_dup_opno
, XINT (x
, 0));
96 fmt
= GET_RTX_FORMAT (code
);
97 len
= GET_RTX_LENGTH (code
);
98 for (i
= 0; i
< len
; i
++)
100 if (fmt
[i
] == 'e' || fmt
[i
] == 'u')
101 max_operand_1 (XEXP (x
, i
));
102 else if (fmt
[i
] == 'E')
105 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
106 max_operand_1 (XVECEXP (x
, i
, j
));
112 max_operand_vec (insn
, arg
)
116 register int len
= XVECLEN (insn
, arg
);
122 for (i
= 0; i
< len
; i
++)
123 max_operand_1 (XVECEXP (insn
, arg
, i
));
133 for (p1
= GET_RTX_NAME (code
); *p1
; p1
++)
135 if (*p1
>= 'a' && *p1
<= 'z')
136 putchar (*p1
+ 'A' - 'a');
142 /* Print a C expression to construct an RTX just like X,
143 substituting any operand references appearing within. */
149 register RTX_CODE code
;
166 printf ("operand%d", XINT (x
, 0));
170 printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
171 XINT (x
, 0), XINT (x
, 0));
172 for (i
= 0; i
< XVECLEN (x
, 1); i
++)
175 gen_exp (XVECEXP (x
, 1, i
));
181 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x
, 0));
182 printf (", %smode", GET_MODE_NAME (GET_MODE (x
)));
183 for (i
= 0; i
< XVECLEN (x
, 2); i
++)
186 gen_exp (XVECEXP (x
, 2, i
));
193 printf ("operand%d", XINT (x
, 0));
197 printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x
)));
201 fatal ("ADDRESS expression code used in named instruction pattern");
213 printf ("const0_rtx");
214 else if (INTVAL (x
) == 1)
215 printf ("const1_rtx");
216 else if (INTVAL (x
) == -1)
217 printf ("constm1_rtx");
218 else if (INTVAL (x
) == STORE_FLAG_VALUE
)
219 printf ("const_true_rtx");
222 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
231 /* These shouldn't be written in MD files. Instead, the appropriate
232 routines in varasm.c should be called. */
238 printf (" (%smode", GET_MODE_NAME (GET_MODE (x
)));
240 fmt
= GET_RTX_FORMAT (code
);
241 len
= GET_RTX_LENGTH (code
);
242 for (i
= 0; i
< len
; i
++)
247 if (fmt
[i
] == 'e' || fmt
[i
] == 'u')
248 gen_exp (XEXP (x
, i
));
249 else if (fmt
[i
] == 'i')
250 printf ("%u", XINT (x
, i
));
251 else if (fmt
[i
] == 's')
252 printf ("\"%s\"", XSTR (x
, i
));
253 else if (fmt
[i
] == 'E')
256 printf ("gen_rtvec (%d", XVECLEN (x
, i
));
257 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
260 gen_exp (XVECEXP (x
, i
, j
));
270 /* Generate the `gen_...' function for a DEFINE_INSN. */
279 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
280 registers or MATCH_SCRATCHes. If so, store away the information for
285 for (i
= XVECLEN (insn
, 1) - 1; i
> 0; i
--)
286 if (GET_CODE (XVECEXP (insn
, 1, i
)) != CLOBBER
287 || (GET_CODE (XEXP (XVECEXP (insn
, 1, i
), 0)) != REG
288 && GET_CODE (XEXP (XVECEXP (insn
, 1, i
), 0)) != MATCH_SCRATCH
))
291 if (i
!= XVECLEN (insn
, 1) - 1)
293 register struct clobber_pat
*p
;
294 register struct clobber_ent
*link
295 = (struct clobber_ent
*) xmalloc (sizeof (struct clobber_ent
));
298 link
->code_number
= insn_code_number
;
300 /* See if any previous CLOBBER_LIST entry is the same as this
303 for (p
= clobber_list
; p
; p
= p
->next
)
305 if (p
->first_clobber
!= i
+ 1
306 || XVECLEN (p
->pattern
, 1) != XVECLEN (insn
, 1))
309 for (j
= i
+ 1; j
< XVECLEN (insn
, 1); j
++)
311 rtx old
= XEXP (XVECEXP (p
->pattern
, 1, j
), 0);
312 rtx
new = XEXP (XVECEXP (insn
, 1, j
), 0);
314 /* OLD and NEW are the same if both are to be a SCRATCH
316 or if both are registers of the same mode and number. */
317 if (! (GET_MODE (old
) == GET_MODE (new)
318 && ((GET_CODE (old
) == MATCH_SCRATCH
319 && GET_CODE (new) == MATCH_SCRATCH
)
320 || (GET_CODE (old
) == REG
&& GET_CODE (new) == REG
321 && REGNO (old
) == REGNO (new)))))
325 if (j
== XVECLEN (insn
, 1))
331 p
= (struct clobber_pat
*) xmalloc (sizeof (struct clobber_pat
));
335 p
->first_clobber
= i
+ 1;
336 p
->next
= clobber_list
;
340 link
->next
= p
->insns
;
345 /* Don't mention instructions whose names are the null string
346 or begin with '*'. They are in the machine description just
348 if (XSTR (insn
, 0)[0] == 0 || XSTR (insn
, 0)[0] == '*')
351 /* Find out how many operands this function has,
352 and also whether any of them have register constraints. */
353 register_constraints
= 0;
354 operands
= max_operand_vec (insn
, 1);
355 if (max_dup_opno
>= operands
)
356 fatal ("match_dup operand number has no match_operand");
358 /* Output the function name and argument declarations. */
359 printf ("rtx\ngen_%s (", XSTR (insn
, 0));
360 for (i
= 0; i
< operands
; i
++)
361 printf (i
? ", operand%d" : "operand%d", i
);
363 for (i
= 0; i
< operands
; i
++)
364 printf (" rtx operand%d;\n", i
);
367 /* Output code to construct and return the rtl for the instruction body */
369 if (XVECLEN (insn
, 1) == 1)
372 gen_exp (XVECEXP (insn
, 1, 0));
377 printf (" return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
380 for (i
= 0; i
< XVECLEN (insn
, 1); i
++)
383 gen_exp (XVECEXP (insn
, 1, i
));
385 printf ("));\n}\n\n");
389 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
398 if (strlen (XSTR (expand
, 0)) == 0)
399 fatal ("define_expand lacks a name");
400 if (XVEC (expand
, 1) == 0)
401 fatal ("define_expand for %s lacks a pattern", XSTR (expand
, 0));
403 /* Find out how many operands this function has,
404 and also whether any of them have register constraints. */
405 register_constraints
= 0;
407 operands
= max_operand_vec (expand
, 1);
409 /* Output the function name and argument declarations. */
410 printf ("rtx\ngen_%s (", XSTR (expand
, 0));
411 for (i
= 0; i
< operands
; i
++)
412 printf (i
? ", operand%d" : "operand%d", i
);
414 for (i
= 0; i
< operands
; i
++)
415 printf (" rtx operand%d;\n", i
);
418 /* If we don't have any C code to write, only one insn is being written,
419 and no MATCH_DUPs are present, we can just return the desired insn
420 like we do for a DEFINE_INSN. This saves memory. */
421 if ((XSTR (expand
, 3) == 0 || *XSTR (expand
, 3) == '\0')
422 && operands
> max_dup_opno
423 && XVECLEN (expand
, 1) == 1)
426 gen_exp (XVECEXP (expand
, 1, 0));
431 /* For each operand referred to only with MATCH_DUPs,
432 make a local variable. */
433 for (i
= operands
; i
<= max_dup_opno
; i
++)
434 printf (" rtx operand%d;\n", i
);
435 if (operands
> 0 || max_dup_opno
>= 0)
436 printf (" rtx operands[%d];\n", MAX (operands
, max_dup_opno
+ 1));
437 printf (" rtx _val = 0;\n");
438 printf (" start_sequence ();\n");
440 /* The fourth operand of DEFINE_EXPAND is some code to be executed
441 before the actual construction.
442 This code expects to refer to `operands'
443 just as the output-code in a DEFINE_INSN does,
444 but here `operands' is an automatic array.
445 So copy the operand values there before executing it. */
446 if (XSTR (expand
, 3) && *XSTR (expand
, 3))
448 /* Output code to copy the arguments into `operands'. */
449 for (i
= 0; i
< operands
; i
++)
450 printf (" operands[%d] = operand%d;\n", i
, i
);
452 /* Output the special code to be executed before the sequence
454 printf ("%s\n", XSTR (expand
, 3));
456 /* Output code to copy the arguments back out of `operands'
457 (unless we aren't going to use them at all). */
458 if (XVEC (expand
, 1) != 0)
460 for (i
= 0; i
< operands
; i
++)
461 printf (" operand%d = operands[%d];\n", i
, i
);
462 for (; i
<= max_dup_opno
; i
++)
463 printf (" operand%d = operands[%d];\n", i
, i
);
467 /* Output code to construct the rtl for the instruction bodies.
468 Use emit_insn to add them to the sequence being accumulated.
469 But don't do this if the user's code has set `no_more' nonzero. */
471 for (i
= 0; i
< XVECLEN (expand
, 1); i
++)
473 rtx next
= XVECEXP (expand
, 1, i
);
474 if ((GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
)
475 || (GET_CODE (next
) == PARALLEL
476 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
477 && GET_CODE (SET_DEST (XVECEXP (next
, 0, 0))) == PC
)
478 || GET_CODE (next
) == RETURN
)
479 printf (" emit_jump_insn (");
480 else if ((GET_CODE (next
) == SET
&& GET_CODE (SET_SRC (next
)) == CALL
)
481 || GET_CODE (next
) == CALL
482 || (GET_CODE (next
) == PARALLEL
483 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
484 && GET_CODE (SET_SRC (XVECEXP (next
, 0, 0))) == CALL
)
485 || (GET_CODE (next
) == PARALLEL
486 && GET_CODE (XVECEXP (next
, 0, 0)) == CALL
))
487 printf (" emit_call_insn (");
488 else if (GET_CODE (next
) == CODE_LABEL
)
489 printf (" emit_label (");
490 else if (GET_CODE (next
) == MATCH_OPERAND
491 || GET_CODE (next
) == MATCH_OPERATOR
492 || GET_CODE (next
) == MATCH_PARALLEL
493 || GET_CODE (next
) == MATCH_OP_DUP
494 || GET_CODE (next
) == MATCH_DUP
495 || GET_CODE (next
) == PARALLEL
)
498 printf (" emit_insn (");
501 if (GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
502 && GET_CODE (SET_SRC (next
)) == LABEL_REF
)
503 printf (" emit_barrier ();");
506 /* Call `gen_sequence' to make a SEQUENCE out of all the
507 insns emitted within this gen_... function. */
509 printf (" _done:\n");
510 printf (" _val = gen_sequence ();\n");
511 printf (" _fail:\n");
512 printf (" end_sequence ();\n");
513 printf (" return _val;\n}\n\n");
516 /* Like gen_expand, but generates a SEQUENCE. */
525 if (XVEC (split
, 0) == 0)
526 fatal ("define_split (definition %d) lacks a pattern", insn_index_number
);
527 else if (XVEC (split
, 2) == 0)
528 fatal ("define_split (definition %d) lacks a replacement pattern",
531 /* Find out how many operands this function has. */
533 max_operand_vec (split
, 2);
534 operands
= MAX (max_opno
, max_dup_opno
) + 1;
536 /* Output the function name and argument declarations. */
537 printf ("rtx\ngen_split_%d (operands)\n rtx *operands;\n",
541 /* Declare all local variables. */
542 for (i
= 0; i
< operands
; i
++)
543 printf (" rtx operand%d;\n", i
);
544 printf (" rtx _val = 0;\n");
545 printf (" start_sequence ();\n");
547 /* The fourth operand of DEFINE_SPLIT is some code to be executed
548 before the actual construction. */
551 printf ("%s\n", XSTR (split
, 3));
553 /* Output code to copy the arguments back out of `operands' */
554 for (i
= 0; i
< operands
; i
++)
555 printf (" operand%d = operands[%d];\n", i
, i
);
557 /* Output code to construct the rtl for the instruction bodies.
558 Use emit_insn to add them to the sequence being accumulated.
559 But don't do this if the user's code has set `no_more' nonzero. */
561 for (i
= 0; i
< XVECLEN (split
, 2); i
++)
563 rtx next
= XVECEXP (split
, 2, i
);
564 if ((GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
)
565 || (GET_CODE (next
) == PARALLEL
566 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
567 && GET_CODE (SET_DEST (XVECEXP (next
, 0, 0))) == PC
)
568 || GET_CODE (next
) == RETURN
)
569 printf (" emit_jump_insn (");
570 else if ((GET_CODE (next
) == SET
&& GET_CODE (SET_SRC (next
)) == CALL
)
571 || GET_CODE (next
) == CALL
572 || (GET_CODE (next
) == PARALLEL
573 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
574 && GET_CODE (SET_SRC (XVECEXP (next
, 0, 0))) == CALL
)
575 || (GET_CODE (next
) == PARALLEL
576 && GET_CODE (XVECEXP (next
, 0, 0)) == CALL
))
577 printf (" emit_call_insn (");
578 else if (GET_CODE (next
) == CODE_LABEL
)
579 printf (" emit_label (");
580 else if (GET_CODE (next
) == MATCH_OPERAND
581 || GET_CODE (next
) == MATCH_OPERATOR
582 || GET_CODE (next
) == MATCH_PARALLEL
583 || GET_CODE (next
) == MATCH_OP_DUP
584 || GET_CODE (next
) == MATCH_DUP
585 || GET_CODE (next
) == PARALLEL
)
588 printf (" emit_insn (");
591 if (GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
592 && GET_CODE (SET_SRC (next
)) == LABEL_REF
)
593 printf (" emit_barrier ();");
596 /* Call `gen_sequence' to make a SEQUENCE out of all the
597 insns emitted within this gen_... function. */
599 printf (" _done:\n");
600 printf (" _val = gen_sequence ();\n");
601 printf (" _fail:\n");
602 printf (" end_sequence ();\n");
603 printf (" return _val;\n}\n\n");
606 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
607 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
608 the end of the vector. */
611 output_add_clobbers ()
613 struct clobber_pat
*clobber
;
614 struct clobber_ent
*ent
;
617 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
618 printf (" rtx pattern;\n int insn_code_number;\n");
620 printf (" int i;\n\n");
621 printf (" switch (insn_code_number)\n");
624 for (clobber
= clobber_list
; clobber
; clobber
= clobber
->next
)
626 for (ent
= clobber
->insns
; ent
; ent
= ent
->next
)
627 printf (" case %d:\n", ent
->code_number
);
629 for (i
= clobber
->first_clobber
; i
< XVECLEN (clobber
->pattern
, 1); i
++)
631 printf (" XVECEXP (pattern, 0, %d) = ", i
);
632 gen_exp (XVECEXP (clobber
->pattern
, 1, i
));
636 printf (" break;\n\n");
639 printf (" default:\n");
640 printf (" abort ();\n");
645 /* Write a function, init_mov_optab, that is called to set up entries
646 in mov_optab for EXTRA_CC_MODES. */
649 output_init_mov_optab ()
651 #ifdef EXTRA_CC_NAMES
652 static char *cc_names
[] = { EXTRA_CC_NAMES
};
656 printf ("\nvoid\ninit_mov_optab ()\n{\n");
658 for (i
= 0; i
< sizeof cc_names
/ sizeof cc_names
[0]; i
++)
660 printf ("#ifdef HAVE_mov");
661 for (p
= cc_names
[i
]; *p
; p
++)
662 printf ("%c", *p
>= 'A' && *p
<= 'Z' ? *p
- 'A' + 'a' : *p
);
664 printf (" if (HAVE_mov");
665 for (p
= cc_names
[i
]; *p
; p
++)
666 printf ("%c", *p
>= 'A' && *p
<= 'Z' ? *p
- 'A' + 'a' : *p
);
668 printf (" mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
670 for (p
= cc_names
[i
]; *p
; p
++)
671 printf ("%c", *p
>= 'A' && *p
<= 'Z' ? *p
- 'A' + 'a' : *p
);
672 printf (";\n#endif\n");
683 register char *val
= (char *) malloc (size
);
686 fatal ("virtual memory exhausted");
696 char *result
= (char *) realloc (ptr
, size
);
698 fatal ("virtual memory exhausted");
704 fatal
VPROTO((char *s
, ...))
706 #ifndef ANSI_PROTOTYPES
713 #ifndef ANSI_PROTOTYPES
714 s
= va_arg (ap
, char *);
717 fprintf (stderr
, "genemit: ");
718 vfprintf (stderr
, s
, ap
);
720 fprintf (stderr
, "\n");
721 exit (FATAL_EXIT_CODE
);
723 #else /* not HAVE_VPRINTF */
729 fprintf (stderr
, "genemit: ");
730 fprintf (stderr
, s
, a1
, a2
);
731 fprintf (stderr
, "\n");
732 exit (FATAL_EXIT_CODE
);
734 #endif /* not HAVE_VPRINTF */
736 /* More 'friendly' abort that prints the line and file.
737 config.h can #define abort fancy_abort if you like that sort of thing. */
742 fatal ("Internal gcc abort.");
754 obstack_init (rtl_obstack
);
757 fatal ("No input file name.");
759 infile
= fopen (argv
[1], "r");
763 exit (FATAL_EXIT_CODE
);
768 /* Assign sequential codes to all entries in the machine description
769 in parallel with the tables in insn-output.c. */
771 insn_code_number
= 0;
772 insn_index_number
= 0;
774 printf ("/* Generated automatically by the program `genemit'\n\
775 from the machine description file `md'. */\n\n");
777 printf ("#include \"config.h\"\n");
778 printf ("#include \"system.h\"\n");
779 printf ("#include \"rtl.h\"\n");
780 printf ("#include \"expr.h\"\n");
781 printf ("#include \"real.h\"\n");
782 printf ("#include \"flags.h\"\n");
783 printf ("#include \"output.h\"\n");
784 printf ("#include \"insn-config.h\"\n\n");
785 printf ("#include \"insn-flags.h\"\n\n");
786 printf ("#include \"insn-codes.h\"\n\n");
787 printf ("#include \"reload.h\"\n");
788 printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
789 printf ("extern rtx recog_operand[];\n");
790 printf ("#define operands emit_operand\n\n");
791 printf ("#define FAIL goto _fail\n\n");
792 printf ("#define DONE goto _done\n\n");
794 /* Read the machine description. */
798 c
= read_skip_spaces (infile
);
803 desc
= read_rtx (infile
);
804 if (GET_CODE (desc
) == DEFINE_INSN
)
809 if (GET_CODE (desc
) == DEFINE_EXPAND
)
814 if (GET_CODE (desc
) == DEFINE_SPLIT
)
819 if (GET_CODE (desc
) == DEFINE_PEEPHOLE
)
826 /* Write out the routine to add CLOBBERs to a pattern. */
827 output_add_clobbers ();
829 /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES. */
830 output_init_mov_optab ();
833 exit (ferror (stdout
) != 0 ? FATAL_EXIT_CODE
: SUCCESS_EXIT_CODE
);