1 /* opc2c.c --- generate C simulator code from from .opc file
3 Copyright (C) 2005, 2007 Free Software Foundation, Inc.
4 Contributed by Red Hat, Inc.
6 This file is part of the GNU simulators.
8 The GNU simulators are free software; you can redistribute them and/or
9 modify them under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2 of the
11 License, or (at your option) any later version.
13 The GNU simulators are distributed in the hope that they will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with the GNU simulators; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
29 #include "safe-fgets.h"
31 static int errors = 0;
46 char id[MAX_BYTES * 8 + 1];
47 unsigned char var_start[MAX_BYTES * 8 + 1];
50 unsigned char decodable_mask;
51 unsigned char decodable_bits;
57 struct Indirect *last_ind;
73 unsigned char *patterns;
79 unsigned char cur_bits[MAX_BYTES + 1];
84 #define lprintf if (sim_log) fprintf
86 opcode prefix_text, suffix_text;
96 typedef struct Indirect
101 struct Indirect *ind;
106 Indirect indirect[256];
109 next_varybits (int bits, opcode * op, int byte)
111 int mask = op->b[byte].decodable_mask;
114 for (i = 0; i < 8; i++)
115 if (!(mask & (1 << i)))
131 valid_varybits (int bits, opcode * op, int byte)
136 for (vn = 0; vn < op->nvaries; vn++)
142 if (byte != op->vary[vn].byte)
144 Vary *v = vary[op->vary[vn].varyno];
145 ob = (bits >> op->vary[vn].shift) & v->mask;
146 lprintf (sim_log, "varybits: vary %s ob %x\n", v->name, ob);
148 for (i = 0; i < v->n_patterns; i++)
149 if (ob == v->patterns[i])
151 lprintf (sim_log, " found at %d\n", i);
163 prmb (int mask, int bits)
165 static char buf[8][30];
172 for (i = 0; i < 8; i++)
189 op_cmp (const void *va, const void *vb)
191 const opcode *a = *(const opcode **) va;
192 const opcode *b = *(const opcode **) vb;
194 if (a->nbytes != b->nbytes)
195 return a->nbytes - b->nbytes;
197 return strcmp (a->id, b->id);
201 dump_lines (opcode * op, int level, Indirect * ind)
206 if (op->semantics_label)
208 printf ("%*sgoto op_semantics_%d;\n", level, "", op->semantics_label);
212 if (ind != op->last_ind)
214 static int labelno = 0;
216 printf ("%*sop_semantics_%d:\n", level, "", labelno);
217 op->semantics_label = labelno;
223 printf ("%*s{\n", level, "");
224 printf ("%*s %s\n", level, "", op->comment);
227 for (i = 0; i < op->nbytes * 8;)
229 if (isalpha (op->id[i]))
236 while (op->id[i] && isalpha (op->id[i]))
238 mask = (mask << 1) | 1;
241 if (op->var_start[i])
245 varnames[vn++] = strdup (name);
246 printf ("#line %d \"%s\"\n", op->lineno, orig_filename);
249 fprintf (stderr, "Error: variable %s spans bytes: %s\n",
253 else if (shift && (mask != 0xff))
254 printf ("%*s int %s AU = (op[%d] >> %d) & 0x%02x;\n",
255 level, "", name, byte, shift, mask);
256 else if (mask != 0xff)
257 printf ("%*s int %s AU = op[%d] & 0x%02x;\n",
258 level, "", name, byte, mask);
260 printf ("%*s int %s AU = op[%d];\n", level, "", name, byte);
267 printf ("%*s if (trace) {\n", level, "");
268 printf ("%*s printf(\"\\033[33m%%s\\033[0m ", level, "");
269 for (i = 0; i < op->nbytes; i++)
272 printf (",\n%*s \"%s\"", level, "", op->comment);
273 for (i = 0; i < op->nbytes; i++)
276 printf (",\n%*s op[%d]", level, "", i);
278 printf (", op[%d]", i);
281 for (i = 0; i < vn; i++)
282 printf ("%*s printf(\" %s = 0x%%x%s\", %s);\n", level, "",
283 varnames[i], (i < vn - 1) ? "," : "\\n", varnames[i]);
284 printf ("%*s }\n", level, "");
286 printf ("#line %d \"%s\"\n", op->lineno + 1, orig_filename);
287 for (i = 0; i < op->nlines; i++)
288 printf ("%*s%s", level, "", op->lines[i]);
290 printf ("%*s}\n", level, "");
294 store_opcode_bits (opcode * op, int byte, Indirect * ind)
296 int bits = op->b[byte].decodable_bits;
300 if (!valid_varybits (bits, op, byte))
303 switch (ind[bits].type)
306 if (byte == op->dbytes - 1)
308 ind[bits].type = T_op;
316 ind[bits].type = T_indirect;
317 ind[bits].u.ind = (Indirect *) malloc (256 * sizeof (Indirect));
318 for (i2 = 0; i2 < 256; i2++)
319 ind[bits].u.ind[i2].type = T_unused;
320 store_opcode_bits (op, byte + 1, ind[bits].u.ind);
325 if (byte < op->dbytes - 1)
326 store_opcode_bits (op, byte + 1, ind[bits].u.ind);
336 while ((bits = next_varybits (bits, op, byte)) != 0);
340 emit_indirect (Indirect * ind, int byte)
346 for (j = 0; j < 256; j++)
354 mask |= ind[j].u.op->b[byte].decodable_mask;
362 printf ("%*s GETBYTE();\n", byte * 6, "");
363 printf ("%*s switch (op[%d] & 0x%02x) {\n", byte * 6, "", byte, mask);
364 for (j = 0; j < 256; j++)
365 if ((j & ~mask) == 0)
375 for (n = j; n < 256; n++)
377 && ind[n].type == T_op && ind[n].u.op == ind[j].u.op)
379 ind[n].type = T_done;
380 printf ("%*s case 0x%02x:\n", byte * 6, "", n);
382 for (n = byte; n < ind[j].u.op->nbytes - 1; n++)
383 printf ("%*s GETBYTE();\n", byte * 6, "");
384 dump_lines (ind[j].u.op, byte * 6 + 6, ind);
385 printf ("%*s break;\n", byte * 6, "");
388 printf ("%*s case 0x%02x:\n", byte * 6, "", j);
389 emit_indirect (ind[j].u.ind, byte + 1);
390 printf ("%*s break;\n", byte * 6, "");
395 printf ("%*s default: UNSUPPORTED(); break;\n", byte * 6, "");
396 printf ("%*s }\n", byte * 6, "");
400 pv_dup (char *p, char *ep)
403 char *rv = (char *) malloc (n + 1);
410 str2mask (char *str, char *ep)
412 unsigned char rv = 0;
424 process_vary (char *line)
427 Vary *v = (Vary *) malloc (sizeof (Vary));
431 vary = (Vary **) realloc (vary, n_varies * sizeof (Vary *));
433 vary = (Vary **) malloc (n_varies * sizeof (Vary *));
434 vary[n_varies - 1] = v;
438 for (cp = line; isspace (*cp); cp++);
439 for (ep = cp; *ep && !isspace (*ep); ep++);
441 v->name = pv_dup (cp, ep);
442 v->nlen = strlen (v->name);
443 v->mask = (1 << v->nlen) - 1;
446 v->patterns = (unsigned char *) malloc (1);
449 for (cp = ep; isspace (*cp); cp++);
452 for (ep = cp; *ep && !isspace (*ep); ep++);
454 v->patterns = (unsigned char *) realloc (v->patterns, v->n_patterns);
455 v->patterns[v->n_patterns - 1] = str2mask (cp, ep);
460 fieldcmp (opcode * op, int bit, char *name)
462 int n = strlen (name);
463 if (memcmp (op->id + bit, name, n) == 0
464 && (!isalpha (op->id[bit + n]) || op->var_start[bit + n]))
470 log_indirect (Indirect * ind, int byte)
475 for (i = 0; i < 256; i++)
477 if (ind[i].type == T_unused)
480 for (j = 0; j < byte; j++)
481 fprintf (sim_log, "%s ", prmb (255, cur_bits[j]));
482 fprintf (sim_log, "%s ", prmb (255, i));
488 if (last_c && (ind[i].u.op->comment == last_c))
489 fprintf (sim_log, "''\n");
491 fprintf (sim_log, "%s\n", ind[i].u.op->comment);
492 last_c = ind[i].u.op->comment;
495 fprintf (sim_log, "-\n");
498 fprintf (sim_log, "indirect\n");
500 log_indirect (ind[i].u.ind, byte + 1);
508 main (int argc, char **argv)
516 if (argc > 2 && strcmp (argv[1], "-l") == 0)
518 sim_log = fopen (argv[2], "w");
519 fprintf (stderr, "sim_log: %s\n", argv[2]);
526 fprintf (stderr, "usage: opc2c infile.opc > outfile.opc\n");
530 orig_filename = argv[1];
531 in = fopen (argv[1], "r");
534 fprintf (stderr, "Unable to open file %s for reading\n", argv[1]);
535 perror ("The error was");
540 opcodes = (opcode **) malloc (sizeof (opcode *));
543 while ((line = safe_fgets (in)) != 0)
546 if (strncmp (line, " /** ", 6) == 0
547 && (isdigit (line[6]) || memcmp (line + 6, "VARY", 4) == 0))
549 if (line[0] == '/' && line[1] == '*' && line[2] == '*')
551 if (strncmp (line, "/** */", 6) == 0)
556 else if (strncmp (line, "/** VARY ", 9) == 0)
557 process_vary (line + 9);
566 (opcode **) realloc (opcodes, n_opcodes * sizeof (opcode *));
567 op = (opcode *) malloc (sizeof (opcode));
568 opcodes[n_opcodes - 1] = op;
570 op->nbytes = op->dbytes = 0;
571 memset (op->id, 0, sizeof (op->id));
572 memset (op->var_start, 0, sizeof (op->var_start));
573 for (i = 0; i < MAX_BYTES; i++)
575 op->b[i].decodable_mask = 0;
576 op->b[i].decodable_bits = 0;
578 op->comment = strdup (line);
579 op->comment[strlen (op->comment) - 1] = 0;
580 while (op->comment[0] && isspace (op->comment[0]))
586 op->semantics_label = 0;
591 for (lp = line + 4; *lp; lp++)
596 if (strncmp (lp, "*/", 2) == 0)
598 else if ((lp[0] == ' ' && lp[1] == ' ') || (lp[0] == '\t'))
604 if (*lp == '0' || *lp == '1')
606 op->b[byte].decodable_mask |= 1 << bit;
608 if (op->dbytes < byte + 1)
609 op->dbytes = byte + 1;
613 op->var_start[i] = 1;
617 op->b[byte].decodable_bits |= 1 << bit;
619 op->nbytes = byte + 1;
630 (char **) realloc (op->lines, op->nlines * sizeof (char *));
632 op->lines = (char **) malloc (op->nlines * sizeof (char *));
633 op->lines[op->nlines - 1] = strdup (line);
639 for (i = 0; i < n_varies; i++)
642 lprintf (sim_log, "V[%s] %d\n", v->name, v->nlen);
643 for (j = 0; j < v->n_patterns; j++)
644 lprintf (sim_log, " P %02x\n", v->patterns[j]);
648 for (i = n_opcodes - 2; i >= 0; i--)
650 if (opcodes[i]->nlines == 0)
652 opcodes[i]->nlines = opcodes[i + 1]->nlines;
653 opcodes[i]->lines = opcodes[i + 1]->lines;
657 for (i = 0; i < 256; i++)
658 indirect[i].type = T_unused;
660 qsort (opcodes, n_opcodes, sizeof (opcodes[0]), op_cmp);
662 vlist = (VaryRef *) malloc (n_varies * sizeof (VaryRef));
664 for (i = 0; i < n_opcodes; i++)
668 for (j = 0; j < opcodes[i]->nbytes; j++)
669 lprintf (sim_log, "%s ",
670 prmb (opcodes[i]->b[j].decodable_mask,
671 opcodes[i]->b[j].decodable_bits));
672 lprintf (sim_log, " %s\n", opcodes[i]->comment);
674 for (j = 0; j < opcodes[i]->nbytes; j++)
676 for (b = 0; b < 8; b++)
677 if (isalpha (opcodes[i]->id[j * 8 + b]))
678 for (v = 0; v < n_varies; v++)
679 if (fieldcmp (opcodes[i], j * 8 + b, vary[v]->name))
681 int nv = opcodes[i]->nvaries++;
684 (VaryRef *) realloc (opcodes[i]->vary,
685 (nv + 1) * sizeof (VaryRef));
688 (VaryRef *) malloc ((nv + 1) * sizeof (VaryRef));
690 opcodes[i]->vary[nv].varyno = v;
691 opcodes[i]->vary[nv].byte = j;
692 opcodes[i]->vary[nv].shift = 8 - b - vary[v]->nlen;
693 lprintf (sim_log, "[vary %s shift %d]\n",
694 vary[v]->name, opcodes[i]->vary[nv].shift);
700 for (i = 0; i < n_opcodes; i++)
703 int bytes = opcodes[i]->dbytes;
705 lprintf (sim_log, "\nmask:");
706 for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
707 lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_mask);
708 lprintf (sim_log, "%*s%s\n", 13 - 3 * opcodes[i]->nbytes, "",
709 opcodes[i]->comment);
711 lprintf (sim_log, "bits:");
712 for (i2 = 0; i2 < opcodes[i]->nbytes; i2++)
713 lprintf (sim_log, " %02x", opcodes[i]->b[i2].decodable_bits);
714 lprintf (sim_log, "%*s(%s) %d byte%s\n", 13 - 3 * opcodes[i]->nbytes,
715 "", opcodes[i]->id, bytes, bytes == 1 ? "" : "s");
717 store_opcode_bits (opcodes[i], 0, indirect);
720 dump_lines (&prefix_text, 0, 0);
722 emit_indirect (indirect, 0);
724 dump_lines (&suffix_text, 0, 0);
727 log_indirect (indirect, 0);