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. */
26 #include "insn-config.h"
28 static struct obstack obstack;
29 struct obstack *rtl_obstack = &obstack;
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
34 /* Names for patterns. Need to allow linking with print-rtl. */
37 /* This structure contains all the information needed to describe one
38 set of extractions methods. Each method may be used by more than
39 one pattern if the operands are in the same place.
41 The string for each operand describes that path to the operand and
42 contains `0' through `9' when going into an expression and `a' through
43 `z' when going into a vector. We assume here that only the first operand
44 of an rtl expression is a vector. genrecog.c makes the same assumption
45 (and uses the same representation) and it is currently true. */
50 char *oplocs[MAX_RECOG_OPERANDS];
52 char *duplocs[MAX_DUP_OPERANDS];
53 int dupnums[MAX_DUP_OPERANDS];
54 struct code_ptr *insns;
55 struct extraction *next;
58 /* Holds a single insn code that use an extraction method. */
63 struct code_ptr *next;
66 static struct extraction *extractions;
68 /* Number instruction patterns handled, starting at 0 for first one. */
70 static int insn_code_number;
72 /* Records the large operand number in this insn. */
76 /* Records the location of any operands using the string format described
79 static char *oplocs[MAX_RECOG_OPERANDS];
81 /* Number the occurrences of MATCH_DUP in each instruction,
82 starting at 0 for the first occurrence. */
86 /* Records the location of any MATCH_DUP operands. */
88 static char *duplocs[MAX_DUP_OPERANDS];
90 /* Record the operand number of any MATCH_DUPs. */
92 static int dupnums[MAX_DUP_OPERANDS];
94 /* Record the list of insn_codes for peepholes. */
96 static struct code_ptr *peepholes;
98 static void gen_insn PROTO ((rtx));
99 static void walk_rtx PROTO ((rtx, char *));
100 static void print_path PROTO ((char *));
101 char *xmalloc PROTO ((unsigned));
102 char *xrealloc PROTO ((char *, unsigned));
103 static void fatal ();
104 static char *copystr PROTO ((char *));
105 static void mybzero ();
106 void fancy_abort PROTO ((void));
113 register struct extraction *p;
114 register struct code_ptr *link;
119 /* No operands seen so far in this pattern. */
120 mybzero (oplocs, sizeof oplocs);
122 /* Walk the insn's pattern, remembering at all times the path
123 down to the walking point. */
125 if (XVECLEN (insn, 1) == 1)
126 walk_rtx (XVECEXP (insn, 1, 0), "");
128 for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
130 char *path = (char *) alloca (2);
135 walk_rtx (XVECEXP (insn, 1, i), path);
138 link = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
139 link->insn_code = insn_code_number;
141 /* See if we find something that already had this extraction method. */
143 for (p = extractions; p; p = p->next)
145 if (p->op_count != op_count || p->dup_count != dup_count)
148 for (i = 0; i < op_count; i++)
149 if (p->oplocs[i] != oplocs[i]
150 && ! (p->oplocs[i] != 0 && oplocs[i] != 0
151 && ! strcmp (p->oplocs[i], oplocs[i])))
157 for (i = 0; i < dup_count; i++)
158 if (p->dupnums[i] != dupnums[i]
159 || strcmp (p->duplocs[i], duplocs[i]))
165 /* This extraction is the same as ours. Just link us in. */
166 link->next = p->insns;
171 /* Otherwise, make a new extraction method. */
173 p = (struct extraction *) xmalloc (sizeof (struct extraction));
174 p->op_count = op_count;
175 p->dup_count = dup_count;
176 p->next = extractions;
181 for (i = 0; i < op_count; i++)
182 p->oplocs[i] = oplocs[i];
184 for (i = 0; i < dup_count; i++)
185 p->dupnums[i] = dupnums[i], p->duplocs[i] = duplocs[i];
193 register RTX_CODE code;
197 int depth = strlen (path);
215 oplocs[XINT (x, 0)] = copystr (path);
216 op_count = MAX (op_count, XINT (x, 0) + 1);
221 duplocs[dup_count] = copystr (path);
222 dupnums[dup_count] = XINT (x, 0);
227 duplocs[dup_count] = copystr (path);
228 dupnums[dup_count] = XINT (x, 0);
231 newpath = (char *) alloca (depth + 2);
232 strcpy (newpath, path);
233 newpath[depth + 1] = 0;
235 for (i = XVECLEN (x, 1) - 1; i >= 0; i--)
237 newpath[depth] = '0' + i;
238 walk_rtx (XVECEXP (x, 1, i), newpath);
243 oplocs[XINT (x, 0)] = copystr (path);
244 op_count = MAX (op_count, XINT (x, 0) + 1);
246 newpath = (char *) alloca (depth + 2);
247 strcpy (newpath, path);
248 newpath[depth + 1] = 0;
250 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
252 newpath[depth] = '0' + i;
253 walk_rtx (XVECEXP (x, 2, i), newpath);
258 oplocs[XINT (x, 0)] = copystr (path);
259 op_count = MAX (op_count, XINT (x, 0) + 1);
261 newpath = (char *) alloca (depth + 2);
262 strcpy (newpath, path);
263 newpath[depth + 1] = 0;
265 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
267 newpath[depth] = 'a' + i;
268 walk_rtx (XVECEXP (x, 2, i), newpath);
273 walk_rtx (XEXP (x, 0), path);
280 newpath = (char *) alloca (depth + 2);
281 strcpy (newpath, path);
282 newpath[depth + 1] = 0;
284 fmt = GET_RTX_FORMAT (code);
285 len = GET_RTX_LENGTH (code);
286 for (i = 0; i < len; i++)
288 if (fmt[i] == 'e' || fmt[i] == 'u')
290 newpath[depth] = '0' + i;
291 walk_rtx (XEXP (x, i), newpath);
293 else if (fmt[i] == 'E')
296 for (j = XVECLEN (x, i) - 1; j >= 0; j--)
298 newpath[depth] = 'a' + j;
299 walk_rtx (XVECEXP (x, i, j), newpath);
305 /* Given a PATH, representing a path down the instruction's
306 pattern from the root to a certain point, output code to
307 evaluate to the rtx at that point. */
313 register int len = strlen (path);
316 /* We first write out the operations (XEXP or XVECEXP) in reverse
317 order, then write "insn", then the indices in forward order. */
319 for (i = len - 1; i >=0 ; i--)
321 if (path[i] >= 'a' && path[i] <= 'z')
322 printf ("XVECEXP (");
323 else if (path[i] >= '0' && path[i] <= '9')
331 for (i = 0; i < len; i++)
333 if (path[i] >= 'a' && path[i] <= 'z')
334 printf (", 0, %d)", path[i] - 'a');
335 else if (path[i] >= '0' && path[i] <= '9')
336 printf (", %d)", path[i] - '0');
346 register char *val = (char *) malloc (size);
349 fatal ("virtual memory exhausted");
358 char *result = (char *) realloc (ptr, size);
360 fatal ("virtual memory exhausted");
368 fprintf (stderr, "genextract: ");
369 fprintf (stderr, s, a1, a2);
370 fprintf (stderr, "\n");
371 exit (FATAL_EXIT_CODE);
374 /* More 'friendly' abort that prints the line and file.
375 config.h can #define abort fancy_abort if you like that sort of thing. */
380 fatal ("Internal gcc abort.");
392 tem = (char *) xmalloc (strlen (s1) + 1);
401 register unsigned length;
415 struct extraction *p;
416 struct code_ptr *link;
418 obstack_init (rtl_obstack);
421 fatal ("No input file name.");
423 infile = fopen (argv[1], "r");
427 exit (FATAL_EXIT_CODE);
432 /* Assign sequential codes to all entries in the machine description
433 in parallel with the tables in insn-output.c. */
435 insn_code_number = 0;
437 printf ("/* Generated automatically by the program `genextract'\n\
438 from the machine description file `md'. */\n\n");
440 printf ("#include \"config.h\"\n");
441 printf ("#include \"system.h\"\n");
442 printf ("#include \"rtl.h\"\n\n");
444 /* This variable exists only so it can be the "location"
445 of any missing operand whose numbers are skipped by a given pattern. */
446 printf ("static rtx junk;\n");
448 printf ("extern rtx recog_operand[];\n");
449 printf ("extern rtx *recog_operand_loc[];\n");
450 printf ("extern rtx *recog_dup_loc[];\n");
451 printf ("extern char recog_dup_num[];\n");
453 printf ("void\ninsn_extract (insn)\n");
454 printf (" rtx insn;\n");
456 printf (" register rtx *ro = recog_operand;\n");
457 printf (" register rtx **ro_loc = recog_operand_loc;\n");
458 printf (" rtx pat = PATTERN (insn);\n");
459 printf (" int i;\n\n");
460 printf (" switch (INSN_CODE (insn))\n");
462 printf (" case -1:\n");
463 printf (" fatal_insn_not_found (insn);\n\n");
465 /* Read the machine description. */
469 c = read_skip_spaces (infile);
474 desc = read_rtx (infile);
475 if (GET_CODE (desc) == DEFINE_INSN)
481 else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
483 struct code_ptr *link
484 = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
486 link->insn_code = insn_code_number;
487 link->next = peepholes;
492 else if (GET_CODE (desc) == DEFINE_EXPAND
493 || GET_CODE (desc) == DEFINE_SPLIT)
497 /* Write out code to handle peepholes and the insn_codes that it should
501 for (link = peepholes; link; link = link->next)
502 printf (" case %d:\n", link->insn_code);
504 /* The vector in the insn says how many operands it has.
505 And all it contains are operands. In fact, the vector was
506 created just for the sake of this function. */
507 printf (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n");
508 printf (" ro[i] = XVECEXP (pat, 0, i);\n");
509 printf (" break;\n\n");
512 /* Write out all the ways to extract insn operands. */
513 for (p = extractions; p; p = p->next)
515 for (link = p->insns; link; link = link->next)
516 printf (" case %d:\n", link->insn_code);
518 for (i = 0; i < p->op_count; i++)
520 if (p->oplocs[i] == 0)
522 printf (" ro[%d] = const0_rtx;\n", i);
523 printf (" ro_loc[%d] = &junk;\n", i);
527 printf (" ro[%d] = *(ro_loc[%d] = &", i, i);
528 print_path (p->oplocs[i]);
533 for (i = 0; i < p->dup_count; i++)
535 printf (" recog_dup_loc[%d] = &", i);
536 print_path (p->duplocs[i]);
538 printf (" recog_dup_num[%d] = %d;\n", i, p->dupnums[i]);
541 printf (" break;\n\n");
544 /* This should never be reached. Note that we would also reach this abort
545 if we tried to extract something whose INSN_CODE was a DEFINE_EXPAND or
546 DEFINE_SPLIT, but that is correct. */
547 printf (" default:\n abort ();\n");
552 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);