1 /* Generate code from machine description to extract operands from insn as rtl.
2 Copyright (C) 1987, 1991, 1992, 1993, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
27 #include "insn-config.h"
28 #include "gensupport.h"
31 /* This structure contains all the information needed to describe one
32 set of extractions methods. Each method may be used by more than
33 one pattern if the operands are in the same place.
35 The string for each operand describes that path to the operand and
36 contains `0' through `9' when going into an expression and `a' through
37 `z' when going into a vector. We assume here that only the first operand
38 of an rtl expression is a vector. genrecog.c makes the same assumption
39 (and uses the same representation) and it is currently true. */
44 char *oplocs[MAX_RECOG_OPERANDS];
46 char *duplocs[MAX_DUP_OPERANDS];
47 int dupnums[MAX_DUP_OPERANDS];
48 struct code_ptr *insns;
49 struct extraction *next;
52 /* Holds a single insn code that use an extraction method. */
57 struct code_ptr *next;
60 static struct extraction *extractions;
62 /* Holds an array of names indexed by insn_code_number. */
63 static char **insn_name_ptr = 0;
64 static int insn_name_ptr_size = 0;
66 /* Number instruction patterns handled, starting at 0 for first one. */
68 static int insn_code_number;
70 /* Records the large operand number in this insn. */
74 /* Records the location of any operands using the string format described
77 static char *oplocs[MAX_RECOG_OPERANDS];
79 /* Number the occurrences of MATCH_DUP in each instruction,
80 starting at 0 for the first occurrence. */
84 /* Records the location of any MATCH_DUP operands. */
86 static char *duplocs[MAX_DUP_OPERANDS];
88 /* Record the operand number of any MATCH_DUPs. */
90 static int dupnums[MAX_DUP_OPERANDS];
92 /* Record the list of insn_codes for peepholes. */
94 static struct code_ptr *peepholes;
96 static void gen_insn PARAMS ((rtx));
97 static void walk_rtx PARAMS ((rtx, const char *));
98 static void print_path PARAMS ((const char *));
99 static void record_insn_name PARAMS ((int, const char *));
106 register struct extraction *p;
107 register struct code_ptr *link;
112 /* No operands seen so far in this pattern. */
113 memset (oplocs, 0, sizeof oplocs);
115 /* Walk the insn's pattern, remembering at all times the path
116 down to the walking point. */
118 if (XVECLEN (insn, 1) == 1)
119 walk_rtx (XVECEXP (insn, 1, 0), "");
121 for (i = XVECLEN (insn, 1) - 1; i >= 0; i--)
123 char *path = (char *) alloca (2);
128 walk_rtx (XVECEXP (insn, 1, i), path);
131 link = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
132 link->insn_code = insn_code_number;
134 /* See if we find something that already had this extraction method. */
136 for (p = extractions; p; p = p->next)
138 if (p->op_count != op_count || p->dup_count != dup_count)
141 for (i = 0; i < op_count; i++)
142 if (p->oplocs[i] != oplocs[i]
143 && ! (p->oplocs[i] != 0 && oplocs[i] != 0
144 && ! strcmp (p->oplocs[i], oplocs[i])))
150 for (i = 0; i < dup_count; i++)
151 if (p->dupnums[i] != dupnums[i]
152 || strcmp (p->duplocs[i], duplocs[i]))
158 /* This extraction is the same as ours. Just link us in. */
159 link->next = p->insns;
164 /* Otherwise, make a new extraction method. */
166 p = (struct extraction *) xmalloc (sizeof (struct extraction));
167 p->op_count = op_count;
168 p->dup_count = dup_count;
169 p->next = extractions;
174 for (i = 0; i < op_count; i++)
175 p->oplocs[i] = oplocs[i];
177 for (i = 0; i < dup_count; i++)
178 p->dupnums[i] = dupnums[i], p->duplocs[i] = duplocs[i];
186 register RTX_CODE code;
189 register const char *fmt;
190 int depth = strlen (path);
208 oplocs[XINT (x, 0)] = xstrdup (path);
209 op_count = MAX (op_count, XINT (x, 0) + 1);
214 duplocs[dup_count] = xstrdup (path);
215 dupnums[dup_count] = XINT (x, 0);
220 duplocs[dup_count] = xstrdup (path);
221 dupnums[dup_count] = XINT (x, 0);
224 newpath = (char *) alloca (depth + 2);
225 strcpy (newpath, path);
226 newpath[depth + 1] = 0;
228 for (i = XVECLEN (x, 1) - 1; i >= 0; i--)
230 newpath[depth] = '0' + i;
231 walk_rtx (XVECEXP (x, 1, i), newpath);
236 oplocs[XINT (x, 0)] = xstrdup (path);
237 op_count = MAX (op_count, XINT (x, 0) + 1);
239 newpath = (char *) alloca (depth + 2);
240 strcpy (newpath, path);
241 newpath[depth + 1] = 0;
243 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
245 newpath[depth] = '0' + i;
246 walk_rtx (XVECEXP (x, 2, i), newpath);
251 oplocs[XINT (x, 0)] = xstrdup (path);
252 op_count = MAX (op_count, XINT (x, 0) + 1);
254 newpath = (char *) alloca (depth + 2);
255 strcpy (newpath, path);
256 newpath[depth + 1] = 0;
258 for (i = XVECLEN (x, 2) - 1; i >= 0; i--)
260 newpath[depth] = 'a' + i;
261 walk_rtx (XVECEXP (x, 2, i), newpath);
266 walk_rtx (XEXP (x, 0), path);
273 newpath = (char *) alloca (depth + 2);
274 strcpy (newpath, path);
275 newpath[depth + 1] = 0;
277 fmt = GET_RTX_FORMAT (code);
278 len = GET_RTX_LENGTH (code);
279 for (i = 0; i < len; i++)
281 if (fmt[i] == 'e' || fmt[i] == 'u')
283 newpath[depth] = '0' + i;
284 walk_rtx (XEXP (x, i), newpath);
286 else if (fmt[i] == 'E')
289 for (j = XVECLEN (x, i) - 1; j >= 0; j--)
291 newpath[depth] = 'a' + j;
292 walk_rtx (XVECEXP (x, i, j), newpath);
298 /* Given a PATH, representing a path down the instruction's
299 pattern from the root to a certain point, output code to
300 evaluate to the rtx at that point. */
306 register int len = strlen (path);
311 /* Don't emit "pat", since we may try to take the address of it,
312 which isn't what is intended. */
313 printf("PATTERN (insn)");
317 /* We first write out the operations (XEXP or XVECEXP) in reverse
318 order, then write "insn", then the indices in forward order. */
320 for (i = len - 1; i >=0 ; i--)
322 if (ISLOWER(path[i]))
323 printf ("XVECEXP (");
324 else if (ISDIGIT(path[i]))
332 for (i = 0; i < len; i++)
334 if (ISLOWER(path[i]))
335 printf (", 0, %d)", path[i] - 'a');
336 else if (ISDIGIT(path[i]))
337 printf (", %d)", path[i] - '0');
347 register PTR val = (PTR) malloc (size);
350 fatal ("virtual memory exhausted");
361 ptr = (PTR) realloc (old, size);
363 ptr = (PTR) malloc (size);
365 fatal ("virtual memory exhausted");
373 register size_t len = strlen (input) + 1;
374 register char *output = xmalloc (len);
375 memcpy (output, input, len);
379 extern int main PARAMS ((int, char **));
388 struct extraction *p;
389 struct code_ptr *link;
392 progname = "genextract";
395 fatal ("No input file name.");
397 if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
398 return (FATAL_EXIT_CODE);
400 /* Assign sequential codes to all entries in the machine description
401 in parallel with the tables in insn-output.c. */
403 insn_code_number = 0;
405 printf ("/* Generated automatically by the program `genextract'\n\
406 from the machine description file `md'. */\n\n");
408 printf ("#include \"config.h\"\n");
409 printf ("#include \"system.h\"\n");
410 printf ("#include \"rtl.h\"\n");
411 printf ("#include \"insn-config.h\"\n");
412 printf ("#include \"recog.h\"\n");
413 printf ("#include \"toplev.h\"\n\n");
415 /* This variable exists only so it can be the "location"
416 of any missing operand whose numbers are skipped by a given pattern. */
417 printf ("static rtx junk ATTRIBUTE_UNUSED;\n");
419 printf ("void\ninsn_extract (insn)\n");
420 printf (" rtx insn;\n");
422 printf (" register rtx *ro = recog_data.operand;\n");
423 printf (" register rtx **ro_loc = recog_data.operand_loc;\n");
424 printf (" rtx pat = PATTERN (insn);\n");
425 printf (" int i ATTRIBUTE_UNUSED;\n\n");
426 printf (" memset (ro, 0, sizeof (*ro) * MAX_RECOG_OPERANDS);\n");
427 printf (" memset (ro_loc, 0, sizeof (*ro_loc) * MAX_RECOG_OPERANDS);\n");
428 printf (" switch (INSN_CODE (insn))\n");
430 printf (" case -1:\n");
431 printf (" fatal_insn_not_found (insn);\n\n");
433 /* Read the machine description. */
439 desc = read_md_rtx (&line_no, &insn_code_number);
443 if (GET_CODE (desc) == DEFINE_INSN)
445 record_insn_name (insn_code_number, XSTR (desc, 0));
449 else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
451 struct code_ptr *link
452 = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
454 link->insn_code = insn_code_number;
455 link->next = peepholes;
460 /* Write out code to handle peepholes and the insn_codes that it should
464 for (link = peepholes; link; link = link->next)
465 printf (" case %d:\n", link->insn_code);
467 /* The vector in the insn says how many operands it has.
468 And all it contains are operands. In fact, the vector was
469 created just for the sake of this function. */
470 printf (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n");
471 printf (" ro[i] = XVECEXP (pat, 0, i);\n");
472 printf (" break;\n\n");
475 /* Write out all the ways to extract insn operands. */
476 for (p = extractions; p; p = p->next)
478 for (link = p->insns; link; link = link->next)
481 name = get_insn_name (i);
483 printf (" case %d: /* %s */\n", i, name);
485 printf (" case %d:\n", i);
488 for (i = 0; i < p->op_count; i++)
490 if (p->oplocs[i] == 0)
492 printf (" ro[%d] = const0_rtx;\n", i);
493 printf (" ro_loc[%d] = &junk;\n", i);
497 printf (" ro[%d] = *(ro_loc[%d] = &", i, i);
498 print_path (p->oplocs[i]);
503 for (i = 0; i < p->dup_count; i++)
505 printf (" recog_data.dup_loc[%d] = &", i);
506 print_path (p->duplocs[i]);
508 printf (" recog_data.dup_num[%d] = %d;\n", i, p->dupnums[i]);
511 printf (" break;\n\n");
514 /* This should never be reached. Note that we would also reach this abort
515 if we tried to extract something whose INSN_CODE was a DEFINE_EXPAND or
516 DEFINE_SPLIT, but that is correct. */
517 printf (" default:\n abort ();\n");
522 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
525 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
528 int code ATTRIBUTE_UNUSED;
530 if (code < insn_name_ptr_size)
531 return insn_name_ptr[code];
537 record_insn_name (code, name)
541 static const char *last_real_name = "insn";
542 static int last_real_code = 0;
545 if (insn_name_ptr_size <= code)
548 new_size = (insn_name_ptr_size ? insn_name_ptr_size * 2 : 512);
550 (char **) xrealloc (insn_name_ptr, sizeof(char *) * new_size);
551 memset (insn_name_ptr + insn_name_ptr_size, 0,
552 sizeof(char *) * (new_size - insn_name_ptr_size));
553 insn_name_ptr_size = new_size;
556 if (!name || name[0] == '\0')
558 new = xmalloc (strlen (last_real_name) + 10);
559 sprintf (new, "%s+%d", last_real_name, code - last_real_code);
563 last_real_name = new = xstrdup (name);
564 last_real_code = code;
567 insn_name_ptr[code] = new;