| File: | src/usr.bin/make/targequiv.c |
| Warning: | line 257, column 2 Value stored to 'i' is never read |
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| 1 | /* $OpenBSD: targequiv.c,v 1.10 2023/09/04 11:35:11 espie Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 2007-2008 Marc Espie. |
| 4 | * |
| 5 | * Extensive code changes for the OpenBSD project. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS |
| 17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD |
| 20 | * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /* Compute equivalence tables of targets, helpful for VPATH and parallel |
| 30 | * make. |
| 31 | */ |
| 32 | |
| 33 | #include <stddef.h> |
| 34 | #include <stdint.h> |
| 35 | #include <stdio.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | #include <ohash.h> |
| 39 | #include <limits.h> |
| 40 | #include "defines.h" |
| 41 | #include "memory.h" |
| 42 | #include "gnode.h" |
| 43 | #include "lst.h" |
| 44 | #include "suff.h" |
| 45 | #include "dir.h" |
| 46 | #include "targ.h" |
| 47 | #include "targequiv.h" |
| 48 | |
| 49 | struct equiv_list { |
| 50 | GNode *first, *last; |
| 51 | char name[1]; |
| 52 | }; |
| 53 | |
| 54 | static struct ohash_info equiv_info = { |
| 55 | offsetof(struct equiv_list, name)__builtin_offsetof(struct equiv_list, name), NULL((void *)0), hash_calloc, hash_free, |
| 56 | element_alloc |
| 57 | }; |
| 58 | |
| 59 | static void attach_node(GNode *, GNode *); |
| 60 | static void build_equivalence(void); |
| 61 | static void add_to_equiv_list(struct ohash *, GNode *); |
| 62 | static char *names_match(GNode *, GNode *); |
| 63 | static char *names_match_with_dir(const char *, const char *, char *, |
| 64 | char *, const char *); |
| 65 | static char *names_match_with_dirs(const char *, const char *, char *, |
| 66 | char *, const char *, const char *); |
| 67 | static char *relative_reduce(const char *, const char *); |
| 68 | static char *relative_reduce2(const char *, const char *, const char *); |
| 69 | static char *absolute_reduce(const char *); |
| 70 | static size_t parse_reduce(size_t, const char *); |
| 71 | static void find_siblings(GNode *); |
| 72 | |
| 73 | /* These functions build `equivalence lists' of targets with the same |
| 74 | * basename, as circular lists. They use an intermediate ohash as scaffold, |
| 75 | * to insert same-basename targets in a simply linked list. Then they make |
| 76 | * those lists circular, to the exception of lone elements, since they can't |
| 77 | * alias to anything. |
| 78 | * |
| 79 | * This structure is used to simplify alias-lookup to a great extent: two |
| 80 | * nodes can only alias each other if they're part of the same equivalence |
| 81 | * set. Most nodes either don't belong to an alias set, or to a very simple |
| 82 | * alias set, thus removing most possibilities. |
| 83 | */ |
| 84 | static void |
| 85 | add_to_equiv_list(struct ohash *equiv, GNode *gn) |
| 86 | { |
| 87 | const char *end = NULL((void *)0); |
| 88 | struct equiv_list *e; |
| 89 | unsigned int slot; |
| 90 | |
| 91 | if (!should_have_file(gn)((gn)->special == 0U && ((gn)->type & (0x00004000 | 0x00020000)) == 0)) |
| 92 | return; |
| 93 | |
| 94 | gn->basename = strrchr(gn->name, '/'); |
| 95 | if (gn->basename == NULL((void *)0)) |
| 96 | gn->basename = gn->name; |
| 97 | else |
| 98 | gn->basename++; |
| 99 | slot = ohash_qlookupi(equiv, gn->basename, &end); |
| 100 | e = ohash_find(equiv, slot); |
| 101 | if (e == NULL((void *)0)) { |
| 102 | e = ohash_create_entry(&equiv_info, gn->basename, &end); |
| 103 | e->first = NULL((void *)0); |
| 104 | e->last = gn; |
| 105 | ohash_insert(equiv, slot, e); |
| 106 | } |
| 107 | gn->next = e->first; |
| 108 | e->first = gn; |
| 109 | } |
| 110 | |
| 111 | static void |
| 112 | build_equivalence() |
| 113 | { |
| 114 | unsigned int i; |
| 115 | GNode *gn; |
| 116 | struct equiv_list *e; |
| 117 | struct ohash equiv; |
| 118 | struct ohash *t = targets_hash(); |
| 119 | |
| 120 | |
| 121 | ohash_init(&equiv, 10, &equiv_info); |
| 122 | |
| 123 | for (gn = ohash_first(t, &i); gn != NULL((void *)0); gn = ohash_next(t, &i)) |
| 124 | add_to_equiv_list(&equiv, gn); |
| 125 | |
| 126 | /* finish making the lists circular */ |
| 127 | for (e = ohash_first(&equiv, &i); e != NULL((void *)0); |
| 128 | e = ohash_next(&equiv, &i)) { |
| 129 | if (e->last != e->first) |
| 130 | e->last->next = e->first; |
| 131 | free(e); |
| 132 | } |
| 133 | ohash_delete(&equiv); |
| 134 | } |
| 135 | |
| 136 | static const char *curdir, *objdir; |
| 137 | static char *kobjdir; |
| 138 | static size_t objdir_len; |
| 139 | |
| 140 | void |
| 141 | Targ_setdirs(const char *c, const char *o) |
| 142 | { |
| 143 | curdir = c; |
| 144 | objdir = o; |
| 145 | |
| 146 | objdir_len = strlen(o); |
| 147 | kobjdir = emalloc(objdir_len+2); |
| 148 | memcpy(kobjdir, o, objdir_len); |
| 149 | kobjdir[objdir_len++] = '/'; |
| 150 | kobjdir[objdir_len] = 0; |
| 151 | } |
| 152 | |
| 153 | |
| 154 | void |
| 155 | kludge_look_harder_for_target(GNode *gn) |
| 156 | { |
| 157 | GNode *extra, *cgn; |
| 158 | LstNode ln; |
| 159 | |
| 160 | if (strncmp(gn->name, kobjdir, objdir_len) == 0) { |
| 161 | extra = Targ_FindNode(gn->name + objdir_len, TARG_NOCREATE)Targ_FindNodei(gn->name + objdir_len, ((void *)0), 0x00); |
| 162 | if (extra != NULL((void *)0)) { |
| 163 | if (Lst_IsEmpty(&gn->commands)((&gn->commands)->firstPtr == ((void *)0))) |
| 164 | Lst_Concat(&gn->commands, &extra->commands); |
| 165 | for (ln = Lst_First(&extra->children)((&extra->children)->firstPtr); ln != NULL((void *)0); |
| 166 | ln = Lst_Adv(ln)((ln)->nextPtr)) { |
| 167 | cgn = Lst_Datum(ln)((ln)->datum); |
| 168 | |
| 169 | if (Lst_AddNew(&gn->children, cgn)) { |
| 170 | Lst_AtEnd(&cgn->parents, gn); |
| 171 | gn->children_left++; |
| 172 | } |
| 173 | } |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | static void |
| 179 | attach_node(GNode *gn, GNode *extra) |
| 180 | { |
| 181 | /* XXX normally extra->sibling == extra, but this is not |
| 182 | * always the case yet, so we merge the two lists |
| 183 | */ |
| 184 | GNode *tmp; |
| 185 | |
| 186 | tmp = gn->sibling; |
| 187 | gn->sibling = extra->sibling; |
| 188 | extra->sibling = tmp; |
| 189 | } |
| 190 | |
| 191 | static char *buffer = NULL((void *)0); |
| 192 | static size_t bufsize = PATH_MAX1024; |
| 193 | |
| 194 | static size_t |
| 195 | parse_reduce(size_t i, const char *src) |
| 196 | { |
| 197 | while (src[0] != 0) { |
| 198 | while (src[0] == '/') |
| 199 | src++; |
| 200 | /* special cases */ |
| 201 | if (src[0] == '.') { |
| 202 | if (src[1] == '/') { |
| 203 | src += 2; |
| 204 | continue; |
| 205 | } |
| 206 | if (src[1] == '.' && src[2] == '/') { |
| 207 | src += 3; |
| 208 | i--; |
| 209 | while (i > 0 && buffer[i-1] != '/') |
| 210 | i--; |
| 211 | if (i == 0) |
| 212 | i = 1; |
| 213 | continue; |
| 214 | } |
| 215 | } |
| 216 | while (src[0] != '/' && src[0] != 0) { |
| 217 | if (i > bufsize - 2) { |
| 218 | bufsize *= 2; |
| 219 | buffer = erealloc(buffer, bufsize); |
| 220 | } |
| 221 | buffer[i++] = *src++; |
| 222 | } |
| 223 | if (src[0] == '/') |
| 224 | buffer[i++] = *src++; |
| 225 | } |
| 226 | buffer[i++] = 0; |
| 227 | return i; |
| 228 | } |
| 229 | |
| 230 | static char * |
| 231 | absolute_reduce(const char *src) |
| 232 | { |
| 233 | size_t i = 0; |
| 234 | |
| 235 | if (buffer == NULL((void *)0)) |
| 236 | buffer = emalloc(bufsize); |
| 237 | |
| 238 | buffer[i++] = '/'; |
| 239 | i = parse_reduce(i, src); |
| 240 | return estrdup(buffer); |
| 241 | } |
| 242 | |
| 243 | static char * |
| 244 | relative_reduce(const char *dir, const char *src) |
| 245 | { |
| 246 | size_t i = 0; |
| 247 | |
| 248 | if (buffer == NULL((void *)0)) |
| 249 | buffer = emalloc(bufsize); |
| 250 | |
| 251 | buffer[i++] = '/'; |
| 252 | i = parse_reduce(i, dir); |
| 253 | i--; |
| 254 | |
| 255 | if (buffer[i-1] != '/') |
| 256 | buffer[i++] = '/'; |
| 257 | i = parse_reduce(i, src); |
Value stored to 'i' is never read | |
| 258 | return estrdup(buffer); |
| 259 | } |
| 260 | |
| 261 | static char * |
| 262 | relative_reduce2(const char *dir1, const char *dir2, const char *src) |
| 263 | { |
| 264 | size_t i = 0; |
| 265 | |
| 266 | if (buffer == NULL((void *)0)) |
| 267 | buffer = emalloc(bufsize); |
| 268 | |
| 269 | buffer[i++] = '/'; |
| 270 | i = parse_reduce(i, dir1); |
| 271 | i--; |
| 272 | if (buffer[i-1] != '/') |
| 273 | buffer[i++] = '/'; |
| 274 | |
| 275 | i = parse_reduce(i, dir2); |
| 276 | i--; |
| 277 | if (buffer[i-1] != '/') |
| 278 | buffer[i++] = '/'; |
| 279 | |
| 280 | i = parse_reduce(i, src); |
| 281 | return estrdup(buffer); |
| 282 | } |
| 283 | |
| 284 | static char * |
| 285 | names_match_with_dir(const char *a, const char *b, char *ra, |
| 286 | char *rb, const char *dir) |
| 287 | { |
| 288 | bool_Bool r; |
| 289 | bool_Bool free_a, free_b; |
| 290 | |
| 291 | if (ra == NULL((void *)0)) { |
| 292 | ra = relative_reduce(dir, a); |
| 293 | free_a = true1; |
| 294 | } else { |
| 295 | free_a = false0; |
| 296 | } |
| 297 | |
| 298 | if (rb == NULL((void *)0)) { |
| 299 | rb = relative_reduce(dir, b); |
| 300 | free_b = true1; |
| 301 | } else { |
| 302 | free_b = false0; |
| 303 | } |
| 304 | r = strcmp(ra, rb) == 0; |
| 305 | if (free_a) |
| 306 | free(ra); |
| 307 | if (r) |
| 308 | return rb; |
| 309 | else { |
| 310 | if (free_b) |
| 311 | free(rb); |
| 312 | return NULL((void *)0); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | static char * |
| 317 | names_match_with_dirs(const char *a, const char *b, char *ra, |
| 318 | char *rb, const char *dir1, const char *dir2) |
| 319 | { |
| 320 | bool_Bool r; |
| 321 | bool_Bool free_a, free_b; |
| 322 | |
| 323 | if (ra == NULL((void *)0)) { |
| 324 | ra = relative_reduce2(dir1, dir2, a); |
| 325 | free_a = true1; |
| 326 | } else { |
| 327 | free_a = false0; |
| 328 | } |
| 329 | |
| 330 | if (rb == NULL((void *)0)) { |
| 331 | rb = relative_reduce2(dir1, dir2, b); |
| 332 | free_b = true1; |
| 333 | } else { |
| 334 | free_b = false0; |
| 335 | } |
| 336 | r = strcmp(ra, rb) == 0; |
| 337 | if (free_a) |
| 338 | free(ra); |
| 339 | if (r) |
| 340 | return rb; |
| 341 | else { |
| 342 | if (free_b) |
| 343 | free(rb); |
| 344 | return NULL((void *)0); |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | static char * |
| 349 | names_match(GNode *a, GNode *b) |
| 350 | { |
| 351 | char *ra = NULL((void *)0) , *rb = NULL((void *)0); |
| 352 | char *r; |
| 353 | |
| 354 | if (a->name[0] == '/') |
| 355 | ra = absolute_reduce(a->name); |
| 356 | if (b->name[0] == '/') |
| 357 | rb = absolute_reduce(b->name); |
| 358 | if (ra && rb) { |
| 359 | if (strcmp(ra, rb) == 0) |
| 360 | r = rb; |
| 361 | else |
| 362 | r = NULL((void *)0); |
| 363 | } else { |
| 364 | r = names_match_with_dir(a->name, b->name, ra, rb, objdir); |
| 365 | if (!r) |
| 366 | r = names_match_with_dir(a->name, b->name, ra, rb, |
| 367 | curdir); |
| 368 | if (!r) { |
| 369 | /* b has necessarily the same one */ |
| 370 | Lst l = find_suffix_path(a); |
| 371 | LstNode ln; |
| 372 | |
| 373 | for (ln = Lst_First(l)((l)->firstPtr); ln != NULL((void *)0); ln = Lst_Adv(ln)((ln)->nextPtr)) { |
| 374 | const char *p = PathEntry_name(Lst_Datum(ln)((ln)->datum)); |
| 375 | if (p[0] == '/') { |
| 376 | r = names_match_with_dir(a->name, |
| 377 | b->name, ra, rb, p); |
| 378 | if (r) |
| 379 | break; |
| 380 | } else { |
| 381 | r = names_match_with_dirs(a->name, |
| 382 | b->name, ra, rb, p, objdir); |
| 383 | if (r) |
| 384 | break; |
| 385 | r = names_match_with_dirs(a->name, |
| 386 | b->name, ra, rb, p, curdir); |
| 387 | if (r) |
| 388 | break; |
| 389 | } |
| 390 | } |
| 391 | } |
| 392 | } |
| 393 | free(ra); |
| 394 | if (r != rb) |
| 395 | free(rb); |
| 396 | return r; |
| 397 | } |
| 398 | |
| 399 | static void |
| 400 | find_siblings(GNode *gn) |
| 401 | { |
| 402 | GNode *gn2; |
| 403 | char *fullpath; |
| 404 | |
| 405 | /* not part of an equivalence class: can't alias */ |
| 406 | if (gn->next == NULL((void *)0)) |
| 407 | return; |
| 408 | /* already resolved, actually */ |
| 409 | if (gn->sibling != gn) |
| 410 | return; |
| 411 | if (DEBUG(NAME_MATCHING)(debug & 0x2000)) |
| 412 | fprintf(stderr(&__sF[2]), "Matching for %s:", gn->name); |
| 413 | /* look through the aliases */ |
| 414 | for (gn2 = gn->next; gn2 != gn; gn2 = gn2->next) { |
| 415 | fullpath = names_match(gn, gn2); |
| 416 | if (fullpath) { |
| 417 | attach_node(gn, gn2); |
| 418 | } else { |
| 419 | if (DEBUG(NAME_MATCHING)(debug & 0x2000)) |
| 420 | fputc('!', stderr(&__sF[2])); |
| 421 | } |
| 422 | if (DEBUG(NAME_MATCHING)(debug & 0x2000)) |
| 423 | fprintf(stderr(&__sF[2]), "%s ", gn2->name); |
| 424 | } |
| 425 | if (DEBUG(NAME_MATCHING)(debug & 0x2000)) |
| 426 | fputc('\n', stderr(&__sF[2])); |
| 427 | } |
| 428 | |
| 429 | void |
| 430 | look_harder_for_target(GNode *gn) |
| 431 | { |
| 432 | static bool_Bool equiv_was_built = false0; |
| 433 | |
| 434 | if (!equiv_was_built) { |
| 435 | build_equivalence(); |
| 436 | equiv_was_built = true1; |
| 437 | } |
| 438 | |
| 439 | if (gn->type & (OP_RESOLVED0x01000000 | OP_PHONY0x00004000)) |
| 440 | return; |
| 441 | gn->type |= OP_RESOLVED0x01000000; |
| 442 | find_siblings(gn); |
| 443 | } |
| 444 | |
| 445 | bool_Bool |
| 446 | is_sibling(GNode *gn, GNode *gn2) |
| 447 | { |
| 448 | GNode *sibling; |
| 449 | |
| 450 | sibling = gn; |
| 451 | do { |
| 452 | if (sibling == gn2) |
| 453 | return true1; |
| 454 | sibling = sibling->sibling; |
| 455 | } while (sibling != gn); |
| 456 | |
| 457 | return false0; |
| 458 | } |