1 /* Generate code from machine description to extract operands from insn as rtl.
2 Copyright (C) 1987, 91, 92, 93, 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. */
31 #include "insn-config.h"
33 static struct obstack obstack;
34 struct obstack *rtl_obstack = &obstack;
36 #define obstack_chunk_alloc xmalloc
37 #define obstack_chunk_free free
39 /* Names for patterns. Need to allow linking with print-rtl. */
42 /* This structure contains all the information needed to describe one
43 set of extractions methods. Each method may be used by more than
44 one pattern if the operands are in the same place.
46 The string for each operand describes that path to the operand and
47 contains `0' through `9' when going into an expression and `a' through
48 `z' when going into a vector. We assume here that only the first operand
49 of an rtl expression is a vector. genrecog.c makes the same assumption
50 (and uses the same representation) and it is currently true. */
55 char *oplocs[MAX_RECOG_OPERANDS];
57 char *duplocs[MAX_DUP_OPERANDS];
58 int dupnums[MAX_DUP_OPERANDS];
59 struct code_ptr *insns;
60 struct extraction *next;
63 /* Holds a single insn code that use an extraction method. */
68 struct code_ptr *next;
71 static struct extraction *extractions;
73 /* Number instruction patterns handled, starting at 0 for first one. */
75 static int insn_code_number;
77 /* Records the large operand number in this insn. */
81 /* Records the location of any operands using the string format described
84 static char *oplocs[MAX_RECOG_OPERANDS];
86 /* Number the occurrences of MATCH_DUP in each instruction,
87 starting at 0 for the first occurrence. */
91 /* Records the location of any MATCH_DUP operands. */
93 static char *duplocs[MAX_DUP_OPERANDS];
95 /* Record the operand number of any MATCH_DUPs. */
97 static int dupnums[MAX_DUP_OPERANDS];
99 /* Record the list of insn_codes for peepholes. */
101 static struct code_ptr *peepholes;
103 static void gen_insn PROTO ((rtx));
104 static void walk_rtx PROTO ((rtx, char *));
105 static void print_path PROTO ((char *));
106 char *xmalloc PROTO ((unsigned));
107 char *xrealloc PROTO ((char *, unsigned));
108 static void fatal PVPROTO ((char *, ...)) ATTRIBUTE_PRINTF_1;
109 static char *copystr PROTO ((char *));
110 static void mybzero ();
111 void fancy_abort PROTO ((void));
118 register struct extraction *p;
119 register struct code_ptr *link;
124 /* No operands seen so far in this pattern. */
125 mybzero (oplocs, sizeof oplocs);
127 /* Walk the insn's pattern, remembering at all times the path
128 down to the walking point. */
130 if (XVECLEN (insn, 1) == 1)
131 walk_rtx (XVECEXP (insn, 1, 0), "");
133 for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
135 char *path = (char *) alloca (2);
140 walk_rtx (XVECEXP (insn, 1, i), path);
143 link = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
144 link->insn_code = insn_code_number;
146 /* See if we find something that already had this extraction method. */
148 for (p = extractions; p; p = p->next)
150 if (p->op_count != op_count || p->dup_count != dup_count)
153 for (i = 0; i < op_count; i++)
154 if (p->oplocs[i] != oplocs[i]
155 && ! (p->oplocs[i] != 0 && oplocs[i] != 0
156 && ! strcmp (p->oplocs[i], oplocs[i])))
162 for (i = 0; i < dup_count; i++)
163 if (p->dupnums[i] != dupnums[i]
164 || strcmp (p->duplocs[i], duplocs[i]))
170 /* This extraction is the same as ours. Just link us in. */
171 link->next = p->insns;
176 /* Otherwise, make a new extraction method. */
178 p = (struct extraction *) xmalloc (sizeof (struct extraction));
179 p->op_count = op_count;
180 p->dup_count = dup_count;
181 p->next = extractions;
186 for (i = 0; i < op_count; i++)
187 p->oplocs[i] = oplocs[i];
189 for (i = 0; i < dup_count; i++)
190 p->dupnums[i] = dupnums[i], p->duplocs[i] = duplocs[i];
198 register RTX_CODE code;
202 int depth = strlen (path);
220 oplocs[XINT (x, 0)] = copystr (path);
221 op_count = MAX (op_count, XINT (x, 0) + 1);
226 duplocs[dup_count] = copystr (path);
227 dupnums[dup_count] = XINT (x, 0);
232 duplocs[dup_count] = copystr (path);
233 dupnums[dup_count] = XINT (x, 0);
236 newpath = (char *) alloca (depth + 2);
237 strcpy (newpath, path);
238 newpath[depth + 1] = 0;
240 for (i = XVECLEN (x, 1) - 1; i >= 0; i--)
242 newpath[depth] = '0' + i;
243 walk_rtx (XVECEXP (x, 1, i), newpath);
248 oplocs[XINT (x, 0)] = copystr (path);
249 op_count = MAX (op_count, XINT (x, 0) + 1);
251 newpath = (char *) alloca (depth + 2);
252 strcpy (newpath, path);
253 newpath[depth + 1] = 0;
255 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
257 newpath[depth] = '0' + i;
258 walk_rtx (XVECEXP (x, 2, i), newpath);
263 oplocs[XINT (x, 0)] = copystr (path);
264 op_count = MAX (op_count, XINT (x, 0) + 1);
266 newpath = (char *) alloca (depth + 2);
267 strcpy (newpath, path);
268 newpath[depth + 1] = 0;
270 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
272 newpath[depth] = 'a' + i;
273 walk_rtx (XVECEXP (x, 2, i), newpath);
278 walk_rtx (XEXP (x, 0), path);
285 newpath = (char *) alloca (depth + 2);
286 strcpy (newpath, path);
287 newpath[depth + 1] = 0;
289 fmt = GET_RTX_FORMAT (code);
290 len = GET_RTX_LENGTH (code);
291 for (i = 0; i < len; i++)
293 if (fmt[i] == 'e' || fmt[i] == 'u')
295 newpath[depth] = '0' + i;
296 walk_rtx (XEXP (x, i), newpath);
298 else if (fmt[i] == 'E')
301 for (j = XVECLEN (x, i) - 1; j >= 0; j--)
303 newpath[depth] = 'a' + j;
304 walk_rtx (XVECEXP (x, i, j), newpath);
310 /* Given a PATH, representing a path down the instruction's
311 pattern from the root to a certain point, output code to
312 evaluate to the rtx at that point. */
318 register int len = strlen (path);
321 /* We first write out the operations (XEXP or XVECEXP) in reverse
322 order, then write "insn", then the indices in forward order. */
324 for (i = len - 1; i >=0 ; i--)
326 if (path[i] >= 'a' && path[i] <= 'z')
327 printf ("XVECEXP (");
328 else if (path[i] >= '0' && path[i] <= '9')
336 for (i = 0; i < len; i++)
338 if (path[i] >= 'a' && path[i] <= 'z')
339 printf (", 0, %d)", path[i] - 'a');
340 else if (path[i] >= '0' && path[i] <= '9')
341 printf (", %d)", path[i] - '0');
351 register char *val = (char *) malloc (size);
354 fatal ("virtual memory exhausted");
363 char *result = (char *) realloc (ptr, size);
365 fatal ("virtual memory exhausted");
370 fatal VPROTO ((char *format, ...))
377 VA_START (ap, format);
380 format = va_arg (ap, char *);
383 fprintf (stderr, "genextract: ");
384 vfprintf (stderr, format, ap);
386 fprintf (stderr, "\n");
387 exit (FATAL_EXIT_CODE);
390 /* More 'friendly' abort that prints the line and file.
391 config.h can #define abort fancy_abort if you like that sort of thing. */
396 fatal ("Internal gcc abort.");
408 tem = (char *) xmalloc (strlen (s1) + 1);
417 register unsigned length;
431 struct extraction *p;
432 struct code_ptr *link;
434 obstack_init (rtl_obstack);
437 fatal ("No input file name.");
439 infile = fopen (argv[1], "r");
443 exit (FATAL_EXIT_CODE);
448 /* Assign sequential codes to all entries in the machine description
449 in parallel with the tables in insn-output.c. */
451 insn_code_number = 0;
453 printf ("/* Generated automatically by the program `genextract'\n\
454 from the machine description file `md'. */\n\n");
456 printf ("#include \"config.h\"\n");
457 printf ("#include \"system.h\"\n");
458 printf ("#include \"rtl.h\"\n\n");
460 /* This variable exists only so it can be the "location"
461 of any missing operand whose numbers are skipped by a given pattern. */
462 printf ("static rtx junk ATTRIBUTE_UNUSED;\n");
464 printf ("extern rtx recog_operand[];\n");
465 printf ("extern rtx *recog_operand_loc[];\n");
466 printf ("extern rtx *recog_dup_loc[];\n");
467 printf ("extern char recog_dup_num[];\n");
469 printf ("void\ninsn_extract (insn)\n");
470 printf (" rtx insn;\n");
472 printf (" register rtx *ro = recog_operand;\n");
473 printf (" register rtx **ro_loc = recog_operand_loc;\n");
474 printf (" rtx pat = PATTERN (insn);\n");
475 printf (" int i;\n\n");
476 printf (" switch (INSN_CODE (insn))\n");
478 printf (" case -1:\n");
479 printf (" fatal_insn_not_found (insn);\n\n");
481 /* Read the machine description. */
485 c = read_skip_spaces (infile);
490 desc = read_rtx (infile);
491 if (GET_CODE (desc) == DEFINE_INSN)
497 else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
499 struct code_ptr *link
500 = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
502 link->insn_code = insn_code_number;
503 link->next = peepholes;
508 else if (GET_CODE (desc) == DEFINE_EXPAND
509 || GET_CODE (desc) == DEFINE_SPLIT)
513 /* Write out code to handle peepholes and the insn_codes that it should
517 for (link = peepholes; link; link = link->next)
518 printf (" case %d:\n", link->insn_code);
520 /* The vector in the insn says how many operands it has.
521 And all it contains are operands. In fact, the vector was
522 created just for the sake of this function. */
523 printf (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n");
524 printf (" ro[i] = XVECEXP (pat, 0, i);\n");
525 printf (" break;\n\n");
528 /* Write out all the ways to extract insn operands. */
529 for (p = extractions; p; p = p->next)
531 for (link = p->insns; link; link = link->next)
532 printf (" case %d:\n", link->insn_code);
534 for (i = 0; i < p->op_count; i++)
536 if (p->oplocs[i] == 0)
538 printf (" ro[%d] = const0_rtx;\n", i);
539 printf (" ro_loc[%d] = &junk;\n", i);
543 printf (" ro[%d] = *(ro_loc[%d] = &", i, i);
544 print_path (p->oplocs[i]);
549 for (i = 0; i < p->dup_count; i++)
551 printf (" recog_dup_loc[%d] = &", i);
552 print_path (p->duplocs[i]);
554 printf (" recog_dup_num[%d] = %d;\n", i, p->dupnums[i]);
557 printf (" break;\n\n");
560 /* This should never be reached. Note that we would also reach this abort
561 if we tried to extract something whose INSN_CODE was a DEFINE_EXPAND or
562 DEFINE_SPLIT, but that is correct. */
563 printf (" default:\n abort ();\n");
568 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);