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);
323 /* Don't emit "pat", since we may try to take the address of it,
324 which isn't what is intended. */
325 printf("PATTERN (insn)");
329 /* We first write out the operations (XEXP or XVECEXP) in reverse
330 order, then write "insn", then the indices in forward order. */
332 for (i = len - 1; i >=0 ; i--)
334 if (path[i] >= 'a' && path[i] <= 'z')
335 printf ("XVECEXP (");
336 else if (path[i] >= '0' && path[i] <= '9')
344 for (i = 0; i < len; i++)
346 if (path[i] >= 'a' && path[i] <= 'z')
347 printf (", 0, %d)", path[i] - 'a');
348 else if (path[i] >= '0' && path[i] <= '9')
349 printf (", %d)", path[i] - '0');
359 register char *val = (char *) malloc (size);
362 fatal ("virtual memory exhausted");
371 char *result = (char *) realloc (ptr, size);
373 fatal ("virtual memory exhausted");
378 fatal VPROTO ((char *format, ...))
385 VA_START (ap, format);
388 format = va_arg (ap, char *);
391 fprintf (stderr, "genextract: ");
392 vfprintf (stderr, format, ap);
394 fprintf (stderr, "\n");
395 exit (FATAL_EXIT_CODE);
398 /* More 'friendly' abort that prints the line and file.
399 config.h can #define abort fancy_abort if you like that sort of thing. */
404 fatal ("Internal gcc abort.");
416 tem = (char *) xmalloc (strlen (s1) + 1);
425 register unsigned length;
439 struct extraction *p;
440 struct code_ptr *link;
442 obstack_init (rtl_obstack);
445 fatal ("No input file name.");
447 infile = fopen (argv[1], "r");
451 exit (FATAL_EXIT_CODE);
456 /* Assign sequential codes to all entries in the machine description
457 in parallel with the tables in insn-output.c. */
459 insn_code_number = 0;
461 printf ("/* Generated automatically by the program `genextract'\n\
462 from the machine description file `md'. */\n\n");
464 printf ("#include \"config.h\"\n");
465 printf ("#include \"system.h\"\n");
466 printf ("#include \"rtl.h\"\n\n");
468 /* This variable exists only so it can be the "location"
469 of any missing operand whose numbers are skipped by a given pattern. */
470 printf ("static rtx junk ATTRIBUTE_UNUSED;\n");
472 printf ("extern rtx recog_operand[];\n");
473 printf ("extern rtx *recog_operand_loc[];\n");
474 printf ("extern rtx *recog_dup_loc[];\n");
475 printf ("extern char recog_dup_num[];\n");
477 printf ("void\ninsn_extract (insn)\n");
478 printf (" rtx insn;\n");
480 printf (" register rtx *ro = recog_operand;\n");
481 printf (" register rtx **ro_loc = recog_operand_loc;\n");
482 printf (" rtx pat = PATTERN (insn);\n");
483 printf (" int i;\n\n");
484 printf (" switch (INSN_CODE (insn))\n");
486 printf (" case -1:\n");
487 printf (" fatal_insn_not_found (insn);\n\n");
489 /* Read the machine description. */
493 c = read_skip_spaces (infile);
498 desc = read_rtx (infile);
499 if (GET_CODE (desc) == DEFINE_INSN)
505 else if (GET_CODE (desc) == DEFINE_PEEPHOLE)
507 struct code_ptr *link
508 = (struct code_ptr *) xmalloc (sizeof (struct code_ptr));
510 link->insn_code = insn_code_number;
511 link->next = peepholes;
516 else if (GET_CODE (desc) == DEFINE_EXPAND
517 || GET_CODE (desc) == DEFINE_SPLIT)
521 /* Write out code to handle peepholes and the insn_codes that it should
525 for (link = peepholes; link; link = link->next)
526 printf (" case %d:\n", link->insn_code);
528 /* The vector in the insn says how many operands it has.
529 And all it contains are operands. In fact, the vector was
530 created just for the sake of this function. */
531 printf (" for (i = XVECLEN (pat, 0) - 1; i >= 0; i--)\n");
532 printf (" ro[i] = XVECEXP (pat, 0, i);\n");
533 printf (" break;\n\n");
536 /* Write out all the ways to extract insn operands. */
537 for (p = extractions; p; p = p->next)
539 for (link = p->insns; link; link = link->next)
540 printf (" case %d:\n", link->insn_code);
542 for (i = 0; i < p->op_count; i++)
544 if (p->oplocs[i] == 0)
546 printf (" ro[%d] = const0_rtx;\n", i);
547 printf (" ro_loc[%d] = &junk;\n", i);
551 printf (" ro[%d] = *(ro_loc[%d] = &", i, i);
552 print_path (p->oplocs[i]);
557 for (i = 0; i < p->dup_count; i++)
559 printf (" recog_dup_loc[%d] = &", i);
560 print_path (p->duplocs[i]);
562 printf (" recog_dup_num[%d] = %d;\n", i, p->dupnums[i]);
565 printf (" break;\n\n");
568 /* This should never be reached. Note that we would also reach this abort
569 if we tried to extract something whose INSN_CODE was a DEFINE_EXPAND or
570 DEFINE_SPLIT, but that is correct. */
571 printf (" default:\n abort ();\n");
576 exit (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);