1 /* $Id: verbose.c,v 1.13 2020/09/10 17:57:34 tom Exp $ */ 2 3 #include "defs.h" 4 5 static void log_conflicts(void); 6 static void log_unused(void); 7 static void print_actions(int stateno); 8 static void print_conflicts(int state); 9 static void print_core(int state); 10 static void print_gotos(int stateno); 11 static void print_nulls(int state); 12 static void print_shifts(action *p); 13 static void print_state(int state); 14 static void print_reductions(action *p, int defred2); 15 16 static Value_t *null_rules; 17 18 void 19 verbose(void) 20 { 21 int i; 22 23 if (!vflag) 24 return; 25 26 null_rules = TMALLOC(Value_t, nrules); 27 NO_SPACE(null_rules); 28 29 fprintf(verbose_file, "\f\n"); 30 for (i = 0; i < nstates; i++) 31 print_state(i); 32 FREE(null_rules); 33 34 if (nunused) 35 log_unused(); 36 if (SRtotal || RRtotal) 37 log_conflicts(); 38 39 fprintf(verbose_file, "\n\n%d terminals, %d nonterminals\n", ntokens, 40 nvars); 41 fprintf(verbose_file, "%d grammar rules, %d states\n", nrules - 2, nstates); 42 #if defined(YYBTYACC) 43 { /* print out the grammar symbol # and parser internal symbol # for each 44 symbol as an aide to writing the implementation for YYDESTRUCT_CALL() 45 and YYSTYPE_TOSTRING() */ 46 int maxtok = 0; 47 48 fputs("\ngrammar parser grammar\n", verbose_file); 49 fputs("symbol# value# symbol\n", verbose_file); 50 for (i = 0; i < ntokens; ++i) 51 { 52 fprintf(verbose_file, " %5d %5d %s\n", 53 i, symbol_value[i], symbol_name[i]); 54 if (symbol_value[i] > maxtok) 55 maxtok = symbol_value[i]; 56 } 57 for (i = ntokens; i < nsyms; ++i) 58 fprintf(verbose_file, " %5d %5d %s\n", 59 i, (maxtok + 1) + symbol_value[i] + 1, symbol_name[i]); 60 } 61 #endif 62 } 63 64 static void 65 log_unused(void) 66 { 67 int i; 68 Value_t *p; 69 70 fprintf(verbose_file, "\n\nRules never reduced:\n"); 71 for (i = 3; i < nrules; ++i) 72 { 73 if (!rules_used[i]) 74 { 75 fprintf(verbose_file, "\t%s :", symbol_name[rlhs[i]]); 76 for (p = ritem + rrhs[i]; *p >= 0; ++p) 77 fprintf(verbose_file, " %s", symbol_name[*p]); 78 fprintf(verbose_file, " (%d)\n", i - 2); 79 } 80 } 81 } 82 83 static void 84 log_conflicts(void) 85 { 86 int i; 87 88 fprintf(verbose_file, "\n\n"); 89 for (i = 0; i < nstates; i++) 90 { 91 if (SRconflicts[i] || RRconflicts[i]) 92 { 93 fprintf(verbose_file, "State %d contains ", i); 94 if (SRconflicts[i] > 0) 95 fprintf(verbose_file, "%d shift/reduce conflict%s", 96 SRconflicts[i], 97 PLURAL(SRconflicts[i])); 98 if (SRconflicts[i] && RRconflicts[i]) 99 fprintf(verbose_file, ", "); 100 if (RRconflicts[i] > 0) 101 fprintf(verbose_file, "%d reduce/reduce conflict%s", 102 RRconflicts[i], 103 PLURAL(RRconflicts[i])); 104 fprintf(verbose_file, ".\n"); 105 } 106 } 107 } 108 109 static void 110 print_state(int state) 111 { 112 if (state) 113 fprintf(verbose_file, "\n\n"); 114 if (SRconflicts[state] || RRconflicts[state]) 115 print_conflicts(state); 116 fprintf(verbose_file, "state %d\n", state); 117 print_core(state); 118 print_nulls(state); 119 print_actions(state); 120 } 121 122 static void 123 print_conflicts(int state) 124 { 125 int symbol, act, number; 126 action *p; 127 128 act = 0; /* not shift/reduce... */ 129 number = -1; 130 symbol = -1; 131 for (p = parser[state]; p; p = p->next) 132 { 133 if (p->suppressed == 2) 134 continue; 135 136 if (p->symbol != symbol) 137 { 138 symbol = p->symbol; 139 number = p->number; 140 if (p->action_code == SHIFT) 141 act = SHIFT; 142 else 143 act = REDUCE; 144 } 145 else if (p->suppressed == 1) 146 { 147 if (state == final_state && symbol == 0) 148 { 149 fprintf(verbose_file, "%d: shift/reduce conflict \ 150 (accept, reduce %d) on $end\n", state, p->number - 2); 151 } 152 else 153 { 154 if (act == SHIFT) 155 { 156 fprintf(verbose_file, "%d: shift/reduce conflict \ 157 (shift %d, reduce %d) on %s\n", state, number, p->number - 2, 158 symbol_name[symbol]); 159 } 160 else 161 { 162 fprintf(verbose_file, "%d: reduce/reduce conflict \ 163 (reduce %d, reduce %d) on %s\n", state, number - 2, p->number - 2, 164 symbol_name[symbol]); 165 } 166 } 167 } 168 } 169 } 170 171 static void 172 print_core(int state) 173 { 174 int i; 175 core *statep = state_table[state]; 176 int k = statep->nitems; 177 178 for (i = 0; i < k; i++) 179 { 180 int rule; 181 Value_t *sp = ritem + statep->items[i]; 182 Value_t *sp1 = sp; 183 184 while (*sp >= 0) 185 ++sp; 186 rule = -(*sp); 187 fprintf(verbose_file, "\t%s : ", symbol_name[rlhs[rule]]); 188 189 for (sp = ritem + rrhs[rule]; sp < sp1; sp++) 190 fprintf(verbose_file, "%s ", symbol_name[*sp]); 191 192 putc('.', verbose_file); 193 194 while (*sp >= 0) 195 { 196 fprintf(verbose_file, " %s", symbol_name[*sp]); 197 sp++; 198 } 199 fprintf(verbose_file, " (%d)\n", -2 - *sp); 200 } 201 } 202 203 static void 204 print_nulls(int state) 205 { 206 action *p; 207 Value_t i, j, k, nnulls; 208 209 nnulls = 0; 210 for (p = parser[state]; p; p = p->next) 211 { 212 if (p->action_code == REDUCE && 213 (p->suppressed == 0 || p->suppressed == 1)) 214 { 215 i = p->number; 216 if (rrhs[i] + 1 == rrhs[i + 1]) 217 { 218 for (j = 0; j < nnulls && i > null_rules[j]; ++j) 219 continue; 220 221 if (j == nnulls) 222 { 223 ++nnulls; 224 null_rules[j] = i; 225 } 226 else if (i != null_rules[j]) 227 { 228 ++nnulls; 229 for (k = (Value_t)(nnulls - 1); k > j; --k) 230 null_rules[k] = null_rules[k - 1]; 231 null_rules[j] = i; 232 } 233 } 234 } 235 } 236 237 for (i = 0; i < nnulls; ++i) 238 { 239 j = null_rules[i]; 240 fprintf(verbose_file, "\t%s : . (%d)\n", symbol_name[rlhs[j]], 241 j - 2); 242 } 243 fprintf(verbose_file, "\n"); 244 } 245 246 static void 247 print_actions(int stateno) 248 { 249 action *p; 250 shifts *sp; 251 252 if (stateno == final_state) 253 fprintf(verbose_file, "\t$end accept\n"); 254 255 p = parser[stateno]; 256 if (p) 257 { 258 print_shifts(p); 259 print_reductions(p, defred[stateno]); 260 } 261 262 sp = shift_table[stateno]; 263 if (sp && sp->nshifts > 0) 264 { 265 int as = accessing_symbol[sp->shift[sp->nshifts - 1]]; 266 267 if (ISVAR(as)) 268 print_gotos(stateno); 269 } 270 } 271 272 static void 273 print_shifts(action *p) 274 { 275 int count; 276 action *q; 277 278 count = 0; 279 for (q = p; q; q = q->next) 280 { 281 if (q->suppressed < 2 && q->action_code == SHIFT) 282 ++count; 283 } 284 285 if (count > 0) 286 { 287 for (; p; p = p->next) 288 { 289 if (p->action_code == SHIFT && p->suppressed == 0) 290 fprintf(verbose_file, "\t%s shift %d\n", 291 symbol_name[p->symbol], p->number); 292 #if defined(YYBTYACC) 293 if (backtrack && p->action_code == SHIFT && p->suppressed == 1) 294 fprintf(verbose_file, "\t%s [trial] shift %d\n", 295 symbol_name[p->symbol], p->number); 296 #endif 297 } 298 } 299 } 300 301 static void 302 print_reductions(action *p, int defred2) 303 { 304 int anyreds; 305 action *q; 306 307 anyreds = 0; 308 for (q = p; q; q = q->next) 309 { 310 if (q->action_code == REDUCE && q->suppressed < 2) 311 { 312 anyreds = 1; 313 break; 314 } 315 } 316 317 if (anyreds == 0) 318 fprintf(verbose_file, "\t. error\n"); 319 else 320 { 321 for (; p; p = p->next) 322 { 323 if (p->action_code == REDUCE && p->number != defred2) 324 { 325 int k = p->number - 2; 326 327 if (p->suppressed == 0) 328 fprintf(verbose_file, "\t%s reduce %d\n", 329 symbol_name[p->symbol], k); 330 #if defined(YYBTYACC) 331 if (backtrack && p->suppressed == 1) 332 fprintf(verbose_file, "\t%s [trial] reduce %d\n", 333 symbol_name[p->symbol], k); 334 #endif 335 } 336 } 337 338 if (defred2 > 0) 339 fprintf(verbose_file, "\t. reduce %d\n", defred2 - 2); 340 } 341 } 342 343 static void 344 print_gotos(int stateno) 345 { 346 int i; 347 Value_t *to_state2; 348 shifts *sp; 349 350 putc('\n', verbose_file); 351 sp = shift_table[stateno]; 352 to_state2 = sp->shift; 353 for (i = 0; i < sp->nshifts; ++i) 354 { 355 int k = to_state2[i]; 356 int as = accessing_symbol[k]; 357 358 if (ISVAR(as)) 359 fprintf(verbose_file, "\t%s goto %d\n", symbol_name[as], k); 360 } 361 } 362