f85444da4a41cd4dcec9e0b1d94f07fbd6470d2b
1 /* Generate code from machine description to emit insns as rtl.
2 Copyright (C) 1987, 1988, 1991 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
26 static struct obstack obstack
;
27 struct obstack
*rtl_obstack
= &obstack
;
29 #define obstack_chunk_alloc xmalloc
30 #define obstack_chunk_free free
39 static int max_dup_opno
;
40 static int register_constraints
;
41 static int insn_code_number
;
42 static int insn_index_number
;
44 /* Data structure for recording the patterns of insns that have CLOBBERs.
45 We use this to output a function that adds these CLOBBERs to a
46 previously-allocated PARALLEL expression. */
50 struct clobber_ent
*insns
;
53 struct clobber_pat
*next
;
56 /* Records one insn that uses the clobber list. */
60 int code_number
; /* Counts only insns. */
61 struct clobber_ent
*next
;
68 register RTX_CODE code
;
78 if (code
== MATCH_OPERAND
&& XSTR (x
, 2) != 0 && *XSTR (x
, 2) != '\0')
79 register_constraints
= 1;
80 if (code
== MATCH_SCRATCH
&& XSTR (x
, 1) != 0 && *XSTR (x
, 1) != '\0')
81 register_constraints
= 1;
82 if (code
== MATCH_OPERAND
|| code
== MATCH_OPERATOR
83 || code
== MATCH_PARALLEL
)
84 max_opno
= MAX (max_opno
, XINT (x
, 0));
85 if (code
== MATCH_DUP
|| code
== MATCH_OP_DUP
)
86 max_dup_opno
= MAX (max_dup_opno
, XINT (x
, 0));
88 fmt
= GET_RTX_FORMAT (code
);
89 len
= GET_RTX_LENGTH (code
);
90 for (i
= 0; i
< len
; i
++)
92 if (fmt
[i
] == 'e' || fmt
[i
] == 'u')
93 max_operand_1 (XEXP (x
, i
));
94 else if (fmt
[i
] == 'E')
97 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
98 max_operand_1 (XVECEXP (x
, i
, j
));
104 max_operand_vec (insn
, arg
)
108 register int len
= XVECLEN (insn
, arg
);
114 for (i
= 0; i
< len
; i
++)
115 max_operand_1 (XVECEXP (insn
, arg
, i
));
125 for (p1
= GET_RTX_NAME (code
); *p1
; p1
++)
127 if (*p1
>= 'a' && *p1
<= 'z')
128 putchar (*p1
+ 'A' - 'a');
134 /* Print a C expression to construct an RTX just like X,
135 substituting any operand references appearing within. */
141 register RTX_CODE code
;
158 printf ("operand%d", XINT (x
, 0));
162 printf ("gen_rtx (GET_CODE (operand%d), GET_MODE (operand%d)",
163 XINT (x
, 0), XINT (x
, 0));
164 for (i
= 0; i
< XVECLEN (x
, 1); i
++)
167 gen_exp (XVECEXP (x
, 1, i
));
173 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x
, 0));
174 printf (", %smode", GET_MODE_NAME (GET_MODE (x
)));
175 for (i
= 0; i
< XVECLEN (x
, 2); i
++)
178 gen_exp (XVECEXP (x
, 2, i
));
184 printf ("operand%d", XINT (x
, 0));
188 printf ("gen_rtx (SCRATCH, %smode, 0)", GET_MODE_NAME (GET_MODE (x
)));
192 fatal ("ADDRESS expression code used in named instruction pattern");
205 printf ("const0_rtx");
210 printf ("const1_rtx");
213 if (INTVAL (x
) == -1)
215 printf ("constm1_rtx");
218 if (INTVAL (x
) == STORE_FLAG_VALUE
)
220 printf ("const_true_rtx");
225 printf ("gen_rtx (");
227 printf (", %smode", GET_MODE_NAME (GET_MODE (x
)));
229 fmt
= GET_RTX_FORMAT (code
);
230 len
= GET_RTX_LENGTH (code
);
231 for (i
= 0; i
< len
; i
++)
236 if (fmt
[i
] == 'e' || fmt
[i
] == 'u')
237 gen_exp (XEXP (x
, i
));
238 else if (fmt
[i
] == 'i')
239 printf ("%u", (unsigned) XINT (x
, i
));
240 else if (fmt
[i
] == 's')
241 printf ("\"%s\"", XSTR (x
, i
));
242 else if (fmt
[i
] == 'E')
245 printf ("gen_rtvec (%d", XVECLEN (x
, i
));
246 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
249 gen_exp (XVECEXP (x
, i
, j
));
259 /* Generate the `gen_...' function for a DEFINE_INSN. */
268 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
269 registers or MATCH_SCRATCHes. If so, store away the information for
274 for (i
= XVECLEN (insn
, 1) - 1; i
> 0; i
--)
275 if (GET_CODE (XVECEXP (insn
, 1, i
)) != CLOBBER
276 || (GET_CODE (XEXP (XVECEXP (insn
, 1, i
), 0)) != REG
277 && GET_CODE (XEXP (XVECEXP (insn
, 1, i
), 0)) != MATCH_SCRATCH
))
280 if (i
!= XVECLEN (insn
, 1) - 1)
282 register struct clobber_pat
*p
;
283 register struct clobber_ent
*link
284 = (struct clobber_ent
*) xmalloc (sizeof (struct clobber_ent
));
287 link
->code_number
= insn_code_number
;
289 /* See if any previous CLOBBER_LIST entry is the same as this
292 for (p
= clobber_list
; p
; p
= p
->next
)
294 if (p
->first_clobber
!= i
+ 1
295 || XVECLEN (p
->pattern
, 1) != XVECLEN (insn
, 1))
298 for (j
= i
+ 1; j
< XVECLEN (insn
, 1); j
++)
300 rtx old
= XEXP (XVECEXP (p
->pattern
, 1, j
), 0);
301 rtx
new = XEXP (XVECEXP (insn
, 1, j
), 0);
303 /* OLD and NEW are the same if both are to be a SCRATCH
304 or if both are registers of the same mode and number. */
305 if (! ((GET_CODE (old
) == MATCH_SCRATCH
306 && GET_CODE (new) == MATCH_SCRATCH
)
307 || (GET_CODE (old
) == REG
&& GET_CODE (new) == REG
308 && GET_MODE (old
) == GET_MODE (new)
309 && REGNO (old
) == REGNO (new))))
313 if (j
== XVECLEN (insn
, 1))
319 p
= (struct clobber_pat
*) xmalloc (sizeof (struct clobber_pat
));
323 p
->first_clobber
= i
+ 1;
324 p
->next
= clobber_list
;
328 link
->next
= p
->insns
;
333 /* Don't mention instructions whose names are the null string.
334 They are in the machine description just to be recognized. */
335 if (strlen (XSTR (insn
, 0)) == 0)
338 /* Find out how many operands this function has,
339 and also whether any of them have register constraints. */
340 register_constraints
= 0;
341 operands
= max_operand_vec (insn
, 1);
342 if (max_dup_opno
>= operands
)
343 fatal ("match_dup operand number has no match_operand");
345 /* Output the function name and argument declarations. */
346 printf ("rtx\ngen_%s (", XSTR (insn
, 0));
347 for (i
= 0; i
< operands
; i
++)
348 printf (i
? ", operand%d" : "operand%d", i
);
350 for (i
= 0; i
< operands
; i
++)
351 printf (" rtx operand%d;\n", i
);
354 /* Output code to construct and return the rtl for the instruction body */
356 if (XVECLEN (insn
, 1) == 1)
359 gen_exp (XVECEXP (insn
, 1, 0));
364 printf (" return gen_rtx (PARALLEL, VOIDmode, gen_rtvec (%d", XVECLEN (insn
, 1));
365 for (i
= 0; i
< XVECLEN (insn
, 1); i
++)
368 gen_exp (XVECEXP (insn
, 1, i
));
370 printf ("));\n}\n\n");
374 /* Generate the `gen_...' function for a DEFINE_EXPAND. */
383 if (strlen (XSTR (expand
, 0)) == 0)
384 fatal ("define_expand lacks a name");
385 if (XVEC (expand
, 1) == 0)
386 fatal ("define_expand for %s lacks a pattern", XSTR (expand
, 0));
388 /* Find out how many operands this function has,
389 and also whether any of them have register constraints. */
390 register_constraints
= 0;
392 operands
= max_operand_vec (expand
, 1);
394 /* Output the function name and argument declarations. */
395 printf ("rtx\ngen_%s (", XSTR (expand
, 0));
396 for (i
= 0; i
< operands
; i
++)
397 printf (i
? ", operand%d" : "operand%d", i
);
399 for (i
= 0; i
< operands
; i
++)
400 printf (" rtx operand%d;\n", i
);
403 /* If we don't have any C code to write, only one insn is being written,
404 and no MATCH_DUPs are present, we can just return the desired insn
405 like we do for a DEFINE_INSN. This saves memory. */
406 if ((XSTR (expand
, 3) == 0 || *XSTR (expand
, 3) == '\0')
407 && operands
> max_dup_opno
408 && XVECLEN (expand
, 1) == 1)
411 gen_exp (XVECEXP (expand
, 1, 0));
416 /* For each operand referred to only with MATCH_DUPs,
417 make a local variable. */
418 for (i
= operands
; i
<= max_dup_opno
; i
++)
419 printf (" rtx operand%d;\n", i
);
420 if (operands
> 0 || max_dup_opno
>= 0)
421 printf (" rtx operands[%d];\n", MAX (operands
, max_dup_opno
+ 1));
422 printf (" rtx _val = 0;\n");
423 printf (" start_sequence ();\n");
425 /* The fourth operand of DEFINE_EXPAND is some code to be executed
426 before the actual construction.
427 This code expects to refer to `operands'
428 just as the output-code in a DEFINE_INSN does,
429 but here `operands' is an automatic array.
430 So copy the operand values there before executing it. */
431 if (XSTR (expand
, 3) && *XSTR (expand
, 3))
433 /* Output code to copy the arguments into `operands'. */
434 for (i
= 0; i
< operands
; i
++)
435 printf (" operands[%d] = operand%d;\n", i
, i
);
437 /* Output the special code to be executed before the sequence
439 printf ("%s\n", XSTR (expand
, 3));
441 /* Output code to copy the arguments back out of `operands'
442 (unless we aren't going to use them at all). */
443 if (XVEC (expand
, 1) != 0)
445 for (i
= 0; i
< operands
; i
++)
446 printf (" operand%d = operands[%d];\n", i
, i
);
447 for (; i
<= max_dup_opno
; i
++)
448 printf (" operand%d = operands[%d];\n", i
, i
);
452 /* Output code to construct the rtl for the instruction bodies.
453 Use emit_insn to add them to the sequence being accumulated.
454 But don't do this if the user's code has set `no_more' nonzero. */
456 for (i
= 0; i
< XVECLEN (expand
, 1); i
++)
458 rtx next
= XVECEXP (expand
, 1, i
);
459 if ((GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
)
460 || (GET_CODE (next
) == PARALLEL
461 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
462 && GET_CODE (SET_DEST (XVECEXP (next
, 0, 0))) == PC
)
463 || GET_CODE (next
) == RETURN
)
464 printf (" emit_jump_insn (");
465 else if ((GET_CODE (next
) == SET
&& GET_CODE (SET_SRC (next
)) == CALL
)
466 || GET_CODE (next
) == CALL
467 || (GET_CODE (next
) == PARALLEL
468 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
469 && GET_CODE (SET_SRC (XVECEXP (next
, 0, 0))) == CALL
)
470 || (GET_CODE (next
) == PARALLEL
471 && GET_CODE (XVECEXP (next
, 0, 0)) == CALL
))
472 printf (" emit_call_insn (");
473 else if (GET_CODE (next
) == CODE_LABEL
)
474 printf (" emit_label (");
475 else if (GET_CODE (next
) == MATCH_OPERAND
476 || GET_CODE (next
) == MATCH_OPERATOR
477 || GET_CODE (next
) == MATCH_PARALLEL
478 || GET_CODE (next
) == MATCH_OP_DUP
479 || GET_CODE (next
) == MATCH_DUP
480 || GET_CODE (next
) == PARALLEL
)
483 printf (" emit_insn (");
486 if (GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
487 && GET_CODE (SET_SRC (next
)) == LABEL_REF
)
488 printf (" emit_barrier ();");
491 /* Call `gen_sequence' to make a SEQUENCE out of all the
492 insns emitted within this gen_... function. */
494 printf (" _done:\n");
495 printf (" _val = gen_sequence ();\n");
496 printf (" _fail:\n");
497 printf (" end_sequence ();\n");
498 printf (" return _val;\n}\n\n");
501 /* Like gen_expand, but generates a SEQUENCE. */
509 if (XVEC (split
, 0) == 0)
510 fatal ("define_split (definition %d) lacks a pattern", insn_index_number
);
511 else if (XVEC (split
, 2) == 0)
512 fatal ("define_split (definition %d) lacks a replacement pattern",
515 /* Find out how many operands this function has. */
517 max_operand_vec (split
, 2);
518 operands
= MAX (max_opno
, max_dup_opno
) + 1;
520 /* Output the function name and argument declarations. */
521 printf ("rtx\ngen_split_%d (operands)\n rtx *operands;\n",
525 /* Declare all local variables. */
526 for (i
= 0; i
< operands
; i
++)
527 printf (" rtx operand%d;\n", i
);
528 printf (" rtx _val;\n");
529 printf (" start_sequence ();\n");
531 /* The fourth operand of DEFINE_SPLIT is some code to be executed
532 before the actual construction. */
535 printf ("%s\n", XSTR (split
, 3));
537 /* Output code to copy the arguments back out of `operands' */
538 for (i
= 0; i
< operands
; i
++)
539 printf (" operand%d = operands[%d];\n", i
, i
);
541 /* Output code to construct the rtl for the instruction bodies.
542 Use emit_insn to add them to the sequence being accumulated.
543 But don't do this if the user's code has set `no_more' nonzero. */
545 for (i
= 0; i
< XVECLEN (split
, 2); i
++)
547 rtx next
= XVECEXP (split
, 2, i
);
548 if ((GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
)
549 || (GET_CODE (next
) == PARALLEL
550 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
551 && GET_CODE (SET_DEST (XVECEXP (next
, 0, 0))) == PC
)
552 || GET_CODE (next
) == RETURN
)
553 printf (" emit_jump_insn (");
554 else if ((GET_CODE (next
) == SET
&& GET_CODE (SET_SRC (next
)) == CALL
)
555 || GET_CODE (next
) == CALL
556 || (GET_CODE (next
) == PARALLEL
557 && GET_CODE (XVECEXP (next
, 0, 0)) == SET
558 && GET_CODE (SET_SRC (XVECEXP (next
, 0, 0))) == CALL
)
559 || (GET_CODE (next
) == PARALLEL
560 && GET_CODE (XVECEXP (next
, 0, 0)) == CALL
))
561 printf (" emit_call_insn (");
562 else if (GET_CODE (next
) == CODE_LABEL
)
563 printf (" emit_label (");
564 else if (GET_CODE (next
) == MATCH_OPERAND
565 || GET_CODE (next
) == MATCH_OPERATOR
566 || GET_CODE (next
) == MATCH_PARALLEL
567 || GET_CODE (next
) == MATCH_OP_DUP
568 || GET_CODE (next
) == MATCH_DUP
569 || GET_CODE (next
) == PARALLEL
)
572 printf (" emit_insn (");
575 if (GET_CODE (next
) == SET
&& GET_CODE (SET_DEST (next
)) == PC
576 && GET_CODE (SET_SRC (next
)) == LABEL_REF
)
577 printf (" emit_barrier ();");
580 /* Call `gen_sequence' to make a SEQUENCE out of all the
581 insns emitted within this gen_... function. */
583 printf (" _done:\n");
584 printf (" _val = gen_sequence ();\n");
585 printf (" _fail:\n");
586 printf (" end_sequence ();\n");
587 printf (" return _val;\n}\n\n");
590 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
591 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
592 the end of the vector. */
595 output_add_clobbers ()
597 struct clobber_pat
*clobber
;
598 struct clobber_ent
*ent
;
601 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
602 printf (" rtx pattern;\n int insn_code_number;\n");
604 printf (" int i;\n\n");
605 printf (" switch (insn_code_number)\n");
608 for (clobber
= clobber_list
; clobber
; clobber
= clobber
->next
)
610 for (ent
= clobber
->insns
; ent
; ent
= ent
->next
)
611 printf (" case %d:\n", ent
->code_number
);
613 for (i
= clobber
->first_clobber
; i
< XVECLEN (clobber
->pattern
, 1); i
++)
615 printf (" XVECEXP (pattern, 0, %d) = ", i
);
616 gen_exp (XVECEXP (clobber
->pattern
, 1, i
));
620 printf (" break;\n\n");
623 printf (" default:\n");
624 printf (" abort ();\n");
629 /* Write a function, init_mov_optab, that is called to set up entries
630 in mov_optab for EXTRA_CC_MODES. */
633 output_init_mov_optab ()
635 #ifdef EXTRA_CC_NAMES
636 static char *cc_names
[] = { EXTRA_CC_NAMES
};
640 printf ("\nvoid\ninit_mov_optab ()\n{\n");
642 for (i
= 0; i
< sizeof cc_names
/ sizeof cc_names
[0]; i
++)
644 printf ("#ifdef HAVE_mov");
645 for (p
= cc_names
[i
]; *p
; p
++)
646 printf ("%c", *p
>= 'A' && *p
<= 'Z' ? *p
- 'A' + 'a' : *p
);
648 printf (" if (HAVE_mov");
649 for (p
= cc_names
[i
]; *p
; p
++)
650 printf ("%c", *p
>= 'A' && *p
<= 'Z' ? *p
- 'A' + 'a' : *p
);
652 printf (" mov_optab->handlers[(int) %smode].insn_code = CODE_FOR_mov",
654 for (p
= cc_names
[i
]; *p
; p
++)
655 printf ("%c", *p
>= 'A' && *p
<= 'Z' ? *p
- 'A' + 'a' : *p
);
656 printf (";\n#endif\n");
667 register char *val
= (char *) malloc (size
);
670 fatal ("virtual memory exhausted");
680 char *result
= (char *) realloc (ptr
, size
);
682 fatal ("virtual memory exhausted");
690 fprintf (stderr
, "genemit: ");
691 fprintf (stderr
, s
, a1
, a2
);
692 fprintf (stderr
, "\n");
693 exit (FATAL_EXIT_CODE
);
696 /* More 'friendly' abort that prints the line and file.
697 config.h can #define abort fancy_abort if you like that sort of thing. */
702 fatal ("Internal gcc abort.");
712 extern rtx
read_rtx ();
715 obstack_init (rtl_obstack
);
718 fatal ("No input file name.");
720 infile
= fopen (argv
[1], "r");
724 exit (FATAL_EXIT_CODE
);
729 /* Assign sequential codes to all entries in the machine description
730 in parallel with the tables in insn-output.c. */
732 insn_code_number
= 0;
733 insn_index_number
= 0;
735 printf ("/* Generated automatically by the program `genemit'\n\
736 from the machine description file `md'. */\n\n");
738 printf ("#include \"config.h\"\n");
739 printf ("#include \"rtl.h\"\n");
740 printf ("#include \"expr.h\"\n");
741 printf ("#include \"real.h\"\n");
742 printf ("#include \"output.h\"\n");
743 printf ("#include \"insn-config.h\"\n\n");
744 printf ("#include \"insn-flags.h\"\n\n");
745 printf ("#include \"insn-codes.h\"\n\n");
746 printf ("extern char *insn_operand_constraint[][MAX_RECOG_OPERANDS];\n\n");
747 printf ("extern rtx recog_operand[];\n");
748 printf ("#define operands emit_operand\n\n");
749 printf ("#define FAIL goto _fail\n\n");
750 printf ("#define DONE goto _done\n\n");
752 /* Read the machine description. */
756 c
= read_skip_spaces (infile
);
761 desc
= read_rtx (infile
);
762 if (GET_CODE (desc
) == DEFINE_INSN
)
767 if (GET_CODE (desc
) == DEFINE_EXPAND
)
772 if (GET_CODE (desc
) == DEFINE_SPLIT
)
777 if (GET_CODE (desc
) == DEFINE_PEEPHOLE
)
784 /* Write out the routine to add CLOBBERs to a pattern. */
785 output_add_clobbers ();
787 /* Write the routine to initialize mov_optab for the EXTRA_CC_MODES. */
788 output_init_mov_optab ();
791 exit (ferror (stdout
) != 0 ? FATAL_EXIT_CODE
: SUCCESS_EXIT_CODE
);