1 /* Generate code from machine description to extract operands from insn as rtl.
2 Copyright (C) 1987, 1991, 1992, 1993, 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. */
26 #include "insn-config.h"
32 static struct obstack obstack;
33 struct obstack *rtl_obstack = &obstack;
35 #define obstack_chunk_alloc xmalloc
36 #define obstack_chunk_free free
39 extern rtx read_rtx ();
41 /* Names for patterns. Need to allow linking with print-rtl. */
44 /* This structure contains all the information needed to describe one
45 set of extractions methods. Each method may be used by more than
46 one pattern if the operands are in the same place.
48 The string for each operand describes that path to the operand and
49 contains `0' through `9' when going into an expression and `a' through
50 `z' when going into a vector. We assume here that only the first operand
51 of an rtl expression is a vector. genrecog.c makes the same assumption
52 (and uses the same representation) and it is currently true. */
57 char *oplocs[MAX_RECOG_OPERANDS];
59 char *duplocs[MAX_DUP_OPERANDS];
60 int dupnums[MAX_DUP_OPERANDS];
61 struct code_ptr *insns;
62 struct extraction *next;
65 /* Holds a single insn code that use an extraction method. */
70 struct code_ptr *next;
73 static struct extraction *extractions;
75 /* Number instruction patterns handled, starting at 0 for first one. */
77 static int insn_code_number;
79 /* Records the large operand number in this insn. */
83 /* Records the location of any operands using the string format described
86 static char *oplocs[MAX_RECOG_OPERANDS];
88 /* Number the occurrences of MATCH_DUP in each instruction,
89 starting at 0 for the first occurrence. */
93 /* Records the location of any MATCH_DUP operands. */
95 static char *duplocs[MAX_DUP_OPERANDS];
97 /* Record the operand number of any MATCH_DUPs. */
99 static int dupnums[MAX_DUP_OPERANDS];
101 /* Record the list of insn_codes for peepholes. */
103 static struct code_ptr *peepholes;
105 static void walk_rtx ();
106 static void print_path ();
109 static void fatal ();
110 static char *copystr ();
111 static void mybzero ();
119 register struct extraction *p;
120 register struct code_ptr *link;
125 /* No operands seen so far in this pattern. */
126 mybzero (oplocs, sizeof oplocs);
128 /* Walk the insn's pattern, remembering at all times the path
129 down to the walking point. */
131 if (XVECLEN (insn, 1) == 1)
132 walk_rtx (XVECEXP (insn, 1, 0), "");
134 for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
136 char *path = (char *) alloca (2);
141 walk_rtx (XVECEXP (insn, 1, i), path);
144 link = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
145 link->insn_code = insn_code_number;
147 /* See if we find something that already had this extraction method. */
149 for (p = extractions; p; p = p->next)
151 if (p->op_count != op_count || p->dup_count != dup_count)
154 for (i = 0; i < op_count; i++)
155 if (p->oplocs[i] != oplocs[i]
156 && ! (p->oplocs[i] != 0 && oplocs[i] != 0
157 && ! strcmp (p->oplocs[i], oplocs[i])))
163 for (i = 0; i < dup_count; i++)
164 if (p->dupnums[i] != dupnums[i]
165 || strcmp (p->duplocs[i], duplocs[i]))
171 /* This extraction is the same as ours. Just link us in. */
172 link->next = p->insns;
177 /* Otherwise, make a new extraction method. */
179 p = (struct extraction *) xmalloc (sizeof (struct extraction));
180 p->op_count = op_count;
181 p->dup_count = dup_count;
182 p->next = extractions;
187 for (i = 0; i < op_count; i++)
188 p->oplocs[i] = oplocs[i];
190 for (i = 0; i < dup_count; i++)
191 p->dupnums[i] = dupnums[i], p->duplocs[i] = duplocs[i];
199 register RTX_CODE code;
203 int depth = strlen (path);
221 oplocs[XINT (x, 0)] = copystr (path);
222 op_count = MAX (op_count, XINT (x, 0) + 1);
227 duplocs[dup_count] = copystr (path);
228 dupnums[dup_count] = XINT (x, 0);
233 duplocs[dup_count] = copystr (path);
234 dupnums[dup_count] = XINT (x, 0);
237 newpath = (char *) alloca (depth + 2);
238 strcpy (newpath, path);
239 newpath[depth + 1] = 0;
241 for (i = XVECLEN (x, 1) - 1; i >= 0; i--)
243 newpath[depth] = '0' + i;
244 walk_rtx (XVECEXP (x, 1, i), newpath);
249 oplocs[XINT (x, 0)] = copystr (path);
250 op_count = MAX (op_count, XINT (x, 0) + 1);
252 newpath = (char *) alloca (depth + 2);
253 strcpy (newpath, path);
254 newpath[depth + 1] = 0;
256 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
258 newpath[depth] = '0' + i;
259 walk_rtx (XVECEXP (x, 2, i), newpath);
264 oplocs[XINT (x, 0)] = copystr (path);
265 op_count = MAX (op_count, XINT (x, 0) + 1);
267 newpath = (char *) alloca (depth + 2);
268 strcpy (newpath, path);
269 newpath[depth + 1] = 0;
271 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
273 newpath[depth] = 'a' + i;
274 walk_rtx (XVECEXP (x, 2, i), newpath);
279 walk_rtx (XEXP (x, 0), path);
286 newpath = (char *) alloca (depth + 2);
287 strcpy (newpath, path);
288 newpath[depth + 1] = 0;
290 fmt = GET_RTX_FORMAT (code);
291 len = GET_RTX_LENGTH (code);
292 for (i = 0; i < len; i++)
294 if (fmt[i] == 'e' || fmt[i] == 'u')
296 newpath[depth] = '0' + i;
297 walk_rtx (XEXP (x, i), newpath);
299 else if (fmt[i] == 'E')
302 for (j = XVECLEN (x, i) - 1; j >= 0; j--)
304 newpath[depth] = 'a' + j;
305 walk_rtx (XVECEXP (x, i, j), newpath);
311 /* Given a PATH, representing a path down the instruction's
312 pattern from the root to a certain point, output code to
313 evaluate to the rtx at that point. */
319 register int len = strlen (path);
322 /* We first write out the operations (XEXP or XVECEXP) in reverse
323 order, then write "insn", then the indices in forward order. */
325 for (i = len - 1; i >=0 ; i--)
327 if (path[i] >= 'a' && path[i] <= 'z')
328 printf ("XVECEXP (");
329 else if (path[i] >= '0' && path[i] <= '9')
337 for (i = 0; i < len; i++)
339 if (path[i] >= 'a' && path[i] <= 'z')
340 printf (", 0, %d)", path[i] - 'a');
341 else if (path[i] >= '0' && path[i] <= '9')
342 printf (", %d)", path[i] - '0');
352 register char *val = (char *) malloc (size);
355 fatal ("virtual memory exhausted");
364 char *result = (char *) realloc (ptr, size);
366 fatal ("virtual memory exhausted");
374 fprintf (stderr, "genextract: ");
375 fprintf (stderr, s, a1, a2);
376 fprintf (stderr, "\n");
377 exit (FATAL_EXIT_CODE);
380 /* More 'friendly' abort that prints the line and file.
381 config.h can #define abort fancy_abort if you like that sort of thing. */
386 fatal ("Internal gcc abort.");
398 tem = (char *) xmalloc (strlen (s1) + 1);
407 register unsigned length;
421 struct extraction *p;
422 struct code_ptr *link;
424 obstack_init (rtl_obstack);
427 fatal ("No input file name.");
429 infile = fopen (argv[1], "r");
433 exit (FATAL_EXIT_CODE);
438 /* Assign sequential codes to all entries in the machine description
439 in parallel with the tables in insn-output.c. */
441 insn_code_number = 0;
443 printf ("/* Generated automatically by the program `genextract'\n\
444 from the machine description file `md'. */\n\n");
446 printf ("#include \"config.h\"\n");
447 printf ("#include <stdio.h>\n");
448 printf ("#include \"rtl.h\"\n\n");
450 /* This variable exists only so it can be the "location"
451 of any missing operand whose numbers are skipped by a given pattern. */
452 printf ("static rtx junk;\n");
454 printf ("extern rtx recog_operand[];\n");
455 printf ("extern rtx *recog_operand_loc[];\n");
456 printf ("extern rtx *recog_dup_loc[];\n");
457 printf ("extern char recog_dup_num[];\n");
459 printf ("void\ninsn_extract (insn)\n");
460 printf (" rtx insn;\n");
462 printf (" register rtx *ro = recog_operand;\n");
463 printf (" register rtx **ro_loc = recog_operand_loc;\n");
464 printf (" rtx pat = PATTERN (insn);\n");
465 printf (" int i;\n\n");
466 printf (" switch (INSN_CODE (insn))\n");
468 printf (" case -1:\n");
469 printf (" fatal_insn_not_found (insn);\n\n");
471 /* Read the machine description. */
475 c = read_skip_spaces (infile);
480 desc = read_rtx (infile);
481 if (GET_CODE (desc) == DEFINE_INSN)
487 else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
489 struct code_ptr *link
490 = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
492 link->insn_code = insn_code_number;
493 link->next = peepholes;
498 else if (GET_CODE (desc) == DEFINE_EXPAND
499 || GET_CODE (desc) == DEFINE_SPLIT)
503 /* Write out code to handle peepholes and the insn_codes that it should
507 for (link = peepholes; link; link = link->next)
508 printf (" case %d:\n", link->insn_code);
510 /* The vector in the insn says how many operands it has.
511 And all it contains are operands. In fact, the vector was
512 created just for the sake of this function. */
513 printf (" for (i = XVECLEN (pat, 0); i >= 0; i--)\n");
514 printf (" ro[i] = XVECEXP (pat, 0, i);\n");
515 printf (" break;\n\n");
518 /* Write out all the ways to extract insn operands. */
519 for (p = extractions; p; p = p->next)
521 for (link = p->insns; link; link = link->next)
522 printf (" case %d:\n", link->insn_code);
524 for (i = 0; i < p->op_count; i++)
526 if (p->oplocs[i] == 0)
528 printf (" ro[%d] = const0_rtx;\n", i);
529 printf (" ro_loc[%d] = &junk;\n", i);
533 printf (" ro[%d] = *(ro_loc[%d] = &", i, i);
534 print_path (p->oplocs[i]);
539 for (i = 0; i < p->dup_count; i++)
541 printf (" recog_dup_loc[%d] = &", i);
542 print_path (p->duplocs[i]);
544 printf (" recog_dup_num[%d] = %d;\n", i, p->dupnums[i]);
547 printf (" break;\n\n");
550 /* This should never be reached. Note that we would also reach this abort
551 if we tried to extract something whose INSN_CODE was a DEFINE_EXPAND or
552 DEFINE_SPLIT, but that is correct. */
553 printf (" default:\n abort ();\n");
558 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);