Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* Generate kernel symbol version hashes. |
| 2 | Copyright 1996, 1997 Linux International. |
| 3 | |
| 4 | New implementation contributed by Richard Henderson <rth@tamu.edu> |
| 5 | Based on original work by Bjorn Ekwall <bj0rn@blox.se> |
| 6 | |
| 7 | This file was part of the Linux modutils 2.4.22: moved back into the |
| 8 | kernel sources by Rusty Russell/Kai Germaschewski. |
| 9 | |
| 10 | This program is free software; you can redistribute it and/or modify it |
| 11 | under the terms of the GNU General Public License as published by the |
| 12 | Free Software Foundation; either version 2 of the License, or (at your |
| 13 | option) any later version. |
| 14 | |
| 15 | This program is distributed in the hope that it will be useful, but |
| 16 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | General Public License for more details. |
| 19 | |
| 20 | You should have received a copy of the GNU General Public License |
| 21 | along with this program; if not, write to the Free Software Foundation, |
| 22 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <string.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <unistd.h> |
| 28 | #include <assert.h> |
| 29 | #include <stdarg.h> |
| 30 | #ifdef __GNU_LIBRARY__ |
| 31 | #include <getopt.h> |
| 32 | #endif /* __GNU_LIBRARY__ */ |
| 33 | |
| 34 | #include "genksyms.h" |
| 35 | /*----------------------------------------------------------------------*/ |
| 36 | |
| 37 | #define HASH_BUCKETS 4096 |
| 38 | |
| 39 | static struct symbol *symtab[HASH_BUCKETS]; |
| 40 | static FILE *debugfile; |
| 41 | |
| 42 | int cur_line = 1; |
| 43 | char *cur_filename, *source_file; |
| 44 | int in_source_file; |
| 45 | |
| 46 | static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types, |
| 47 | flag_preserve, flag_warnings; |
| 48 | static const char *mod_prefix = ""; |
| 49 | |
| 50 | static int errors; |
| 51 | static int nsyms; |
| 52 | |
| 53 | static struct symbol *expansion_trail; |
| 54 | static struct symbol *visited_symbols; |
| 55 | |
| 56 | static const struct { |
| 57 | int n; |
| 58 | const char *name; |
| 59 | } symbol_types[] = { |
| 60 | [SYM_NORMAL] = { 0, NULL}, |
| 61 | [SYM_TYPEDEF] = {'t', "typedef"}, |
| 62 | [SYM_ENUM] = {'e', "enum"}, |
| 63 | [SYM_STRUCT] = {'s', "struct"}, |
| 64 | [SYM_UNION] = {'u', "union"}, |
| 65 | [SYM_ENUM_CONST] = {'E', "enum constant"}, |
| 66 | }; |
| 67 | |
| 68 | static int equal_list(struct string_list *a, struct string_list *b); |
| 69 | static void print_list(FILE * f, struct string_list *list); |
| 70 | static struct string_list *concat_list(struct string_list *start, ...); |
| 71 | static struct string_list *mk_node(const char *string); |
| 72 | static void print_location(void); |
| 73 | static void print_type_name(enum symbol_type type, const char *name); |
| 74 | |
| 75 | /*----------------------------------------------------------------------*/ |
| 76 | |
| 77 | static const unsigned int crctab32[] = { |
| 78 | 0x00000000U, 0x77073096U, 0xee0e612cU, 0x990951baU, 0x076dc419U, |
| 79 | 0x706af48fU, 0xe963a535U, 0x9e6495a3U, 0x0edb8832U, 0x79dcb8a4U, |
| 80 | 0xe0d5e91eU, 0x97d2d988U, 0x09b64c2bU, 0x7eb17cbdU, 0xe7b82d07U, |
| 81 | 0x90bf1d91U, 0x1db71064U, 0x6ab020f2U, 0xf3b97148U, 0x84be41deU, |
| 82 | 0x1adad47dU, 0x6ddde4ebU, 0xf4d4b551U, 0x83d385c7U, 0x136c9856U, |
| 83 | 0x646ba8c0U, 0xfd62f97aU, 0x8a65c9ecU, 0x14015c4fU, 0x63066cd9U, |
| 84 | 0xfa0f3d63U, 0x8d080df5U, 0x3b6e20c8U, 0x4c69105eU, 0xd56041e4U, |
| 85 | 0xa2677172U, 0x3c03e4d1U, 0x4b04d447U, 0xd20d85fdU, 0xa50ab56bU, |
| 86 | 0x35b5a8faU, 0x42b2986cU, 0xdbbbc9d6U, 0xacbcf940U, 0x32d86ce3U, |
| 87 | 0x45df5c75U, 0xdcd60dcfU, 0xabd13d59U, 0x26d930acU, 0x51de003aU, |
| 88 | 0xc8d75180U, 0xbfd06116U, 0x21b4f4b5U, 0x56b3c423U, 0xcfba9599U, |
| 89 | 0xb8bda50fU, 0x2802b89eU, 0x5f058808U, 0xc60cd9b2U, 0xb10be924U, |
| 90 | 0x2f6f7c87U, 0x58684c11U, 0xc1611dabU, 0xb6662d3dU, 0x76dc4190U, |
| 91 | 0x01db7106U, 0x98d220bcU, 0xefd5102aU, 0x71b18589U, 0x06b6b51fU, |
| 92 | 0x9fbfe4a5U, 0xe8b8d433U, 0x7807c9a2U, 0x0f00f934U, 0x9609a88eU, |
| 93 | 0xe10e9818U, 0x7f6a0dbbU, 0x086d3d2dU, 0x91646c97U, 0xe6635c01U, |
| 94 | 0x6b6b51f4U, 0x1c6c6162U, 0x856530d8U, 0xf262004eU, 0x6c0695edU, |
| 95 | 0x1b01a57bU, 0x8208f4c1U, 0xf50fc457U, 0x65b0d9c6U, 0x12b7e950U, |
| 96 | 0x8bbeb8eaU, 0xfcb9887cU, 0x62dd1ddfU, 0x15da2d49U, 0x8cd37cf3U, |
| 97 | 0xfbd44c65U, 0x4db26158U, 0x3ab551ceU, 0xa3bc0074U, 0xd4bb30e2U, |
| 98 | 0x4adfa541U, 0x3dd895d7U, 0xa4d1c46dU, 0xd3d6f4fbU, 0x4369e96aU, |
| 99 | 0x346ed9fcU, 0xad678846U, 0xda60b8d0U, 0x44042d73U, 0x33031de5U, |
| 100 | 0xaa0a4c5fU, 0xdd0d7cc9U, 0x5005713cU, 0x270241aaU, 0xbe0b1010U, |
| 101 | 0xc90c2086U, 0x5768b525U, 0x206f85b3U, 0xb966d409U, 0xce61e49fU, |
| 102 | 0x5edef90eU, 0x29d9c998U, 0xb0d09822U, 0xc7d7a8b4U, 0x59b33d17U, |
| 103 | 0x2eb40d81U, 0xb7bd5c3bU, 0xc0ba6cadU, 0xedb88320U, 0x9abfb3b6U, |
| 104 | 0x03b6e20cU, 0x74b1d29aU, 0xead54739U, 0x9dd277afU, 0x04db2615U, |
| 105 | 0x73dc1683U, 0xe3630b12U, 0x94643b84U, 0x0d6d6a3eU, 0x7a6a5aa8U, |
| 106 | 0xe40ecf0bU, 0x9309ff9dU, 0x0a00ae27U, 0x7d079eb1U, 0xf00f9344U, |
| 107 | 0x8708a3d2U, 0x1e01f268U, 0x6906c2feU, 0xf762575dU, 0x806567cbU, |
| 108 | 0x196c3671U, 0x6e6b06e7U, 0xfed41b76U, 0x89d32be0U, 0x10da7a5aU, |
| 109 | 0x67dd4accU, 0xf9b9df6fU, 0x8ebeeff9U, 0x17b7be43U, 0x60b08ed5U, |
| 110 | 0xd6d6a3e8U, 0xa1d1937eU, 0x38d8c2c4U, 0x4fdff252U, 0xd1bb67f1U, |
| 111 | 0xa6bc5767U, 0x3fb506ddU, 0x48b2364bU, 0xd80d2bdaU, 0xaf0a1b4cU, |
| 112 | 0x36034af6U, 0x41047a60U, 0xdf60efc3U, 0xa867df55U, 0x316e8eefU, |
| 113 | 0x4669be79U, 0xcb61b38cU, 0xbc66831aU, 0x256fd2a0U, 0x5268e236U, |
| 114 | 0xcc0c7795U, 0xbb0b4703U, 0x220216b9U, 0x5505262fU, 0xc5ba3bbeU, |
| 115 | 0xb2bd0b28U, 0x2bb45a92U, 0x5cb36a04U, 0xc2d7ffa7U, 0xb5d0cf31U, |
| 116 | 0x2cd99e8bU, 0x5bdeae1dU, 0x9b64c2b0U, 0xec63f226U, 0x756aa39cU, |
| 117 | 0x026d930aU, 0x9c0906a9U, 0xeb0e363fU, 0x72076785U, 0x05005713U, |
| 118 | 0x95bf4a82U, 0xe2b87a14U, 0x7bb12baeU, 0x0cb61b38U, 0x92d28e9bU, |
| 119 | 0xe5d5be0dU, 0x7cdcefb7U, 0x0bdbdf21U, 0x86d3d2d4U, 0xf1d4e242U, |
| 120 | 0x68ddb3f8U, 0x1fda836eU, 0x81be16cdU, 0xf6b9265bU, 0x6fb077e1U, |
| 121 | 0x18b74777U, 0x88085ae6U, 0xff0f6a70U, 0x66063bcaU, 0x11010b5cU, |
| 122 | 0x8f659effU, 0xf862ae69U, 0x616bffd3U, 0x166ccf45U, 0xa00ae278U, |
| 123 | 0xd70dd2eeU, 0x4e048354U, 0x3903b3c2U, 0xa7672661U, 0xd06016f7U, |
| 124 | 0x4969474dU, 0x3e6e77dbU, 0xaed16a4aU, 0xd9d65adcU, 0x40df0b66U, |
| 125 | 0x37d83bf0U, 0xa9bcae53U, 0xdebb9ec5U, 0x47b2cf7fU, 0x30b5ffe9U, |
| 126 | 0xbdbdf21cU, 0xcabac28aU, 0x53b39330U, 0x24b4a3a6U, 0xbad03605U, |
| 127 | 0xcdd70693U, 0x54de5729U, 0x23d967bfU, 0xb3667a2eU, 0xc4614ab8U, |
| 128 | 0x5d681b02U, 0x2a6f2b94U, 0xb40bbe37U, 0xc30c8ea1U, 0x5a05df1bU, |
| 129 | 0x2d02ef8dU |
| 130 | }; |
| 131 | |
| 132 | static unsigned long partial_crc32_one(unsigned char c, unsigned long crc) |
| 133 | { |
| 134 | return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8); |
| 135 | } |
| 136 | |
| 137 | static unsigned long partial_crc32(const char *s, unsigned long crc) |
| 138 | { |
| 139 | while (*s) |
| 140 | crc = partial_crc32_one(*s++, crc); |
| 141 | return crc; |
| 142 | } |
| 143 | |
| 144 | static unsigned long crc32(const char *s) |
| 145 | { |
| 146 | return partial_crc32(s, 0xffffffff) ^ 0xffffffff; |
| 147 | } |
| 148 | |
| 149 | /*----------------------------------------------------------------------*/ |
| 150 | |
| 151 | static enum symbol_type map_to_ns(enum symbol_type t) |
| 152 | { |
| 153 | switch (t) { |
| 154 | case SYM_ENUM_CONST: |
| 155 | case SYM_NORMAL: |
| 156 | case SYM_TYPEDEF: |
| 157 | return SYM_NORMAL; |
| 158 | case SYM_ENUM: |
| 159 | case SYM_STRUCT: |
| 160 | case SYM_UNION: |
| 161 | return SYM_STRUCT; |
| 162 | } |
| 163 | return t; |
| 164 | } |
| 165 | |
| 166 | struct symbol *find_symbol(const char *name, enum symbol_type ns, int exact) |
| 167 | { |
| 168 | unsigned long h = crc32(name) % HASH_BUCKETS; |
| 169 | struct symbol *sym; |
| 170 | |
| 171 | for (sym = symtab[h]; sym; sym = sym->hash_next) |
| 172 | if (map_to_ns(sym->type) == map_to_ns(ns) && |
| 173 | strcmp(name, sym->name) == 0 && |
| 174 | sym->is_declared) |
| 175 | break; |
| 176 | |
| 177 | if (exact && sym && sym->type != ns) |
| 178 | return NULL; |
| 179 | return sym; |
| 180 | } |
| 181 | |
| 182 | static int is_unknown_symbol(struct symbol *sym) |
| 183 | { |
| 184 | struct string_list *defn; |
| 185 | |
| 186 | return ((sym->type == SYM_STRUCT || |
| 187 | sym->type == SYM_UNION || |
| 188 | sym->type == SYM_ENUM) && |
| 189 | (defn = sym->defn) && defn->tag == SYM_NORMAL && |
| 190 | strcmp(defn->string, "}") == 0 && |
| 191 | (defn = defn->next) && defn->tag == SYM_NORMAL && |
| 192 | strcmp(defn->string, "UNKNOWN") == 0 && |
| 193 | (defn = defn->next) && defn->tag == SYM_NORMAL && |
| 194 | strcmp(defn->string, "{") == 0); |
| 195 | } |
| 196 | |
| 197 | static struct symbol *__add_symbol(const char *name, enum symbol_type type, |
| 198 | struct string_list *defn, int is_extern, |
| 199 | int is_reference) |
| 200 | { |
| 201 | unsigned long h; |
| 202 | struct symbol *sym; |
| 203 | enum symbol_status status = STATUS_UNCHANGED; |
| 204 | /* The parser adds symbols in the order their declaration completes, |
| 205 | * so it is safe to store the value of the previous enum constant in |
| 206 | * a static variable. |
| 207 | */ |
| 208 | static int enum_counter; |
| 209 | static struct string_list *last_enum_expr; |
| 210 | |
| 211 | if (type == SYM_ENUM_CONST) { |
| 212 | if (defn) { |
| 213 | free_list(last_enum_expr, NULL); |
| 214 | last_enum_expr = copy_list_range(defn, NULL); |
| 215 | enum_counter = 1; |
| 216 | } else { |
| 217 | struct string_list *expr; |
| 218 | char buf[20]; |
| 219 | |
| 220 | snprintf(buf, sizeof(buf), "%d", enum_counter++); |
| 221 | if (last_enum_expr) { |
| 222 | expr = copy_list_range(last_enum_expr, NULL); |
| 223 | defn = concat_list(mk_node("("), |
| 224 | expr, |
| 225 | mk_node(")"), |
| 226 | mk_node("+"), |
| 227 | mk_node(buf), NULL); |
| 228 | } else { |
| 229 | defn = mk_node(buf); |
| 230 | } |
| 231 | } |
| 232 | } else if (type == SYM_ENUM) { |
| 233 | free_list(last_enum_expr, NULL); |
| 234 | last_enum_expr = NULL; |
| 235 | enum_counter = 0; |
| 236 | if (!name) |
| 237 | /* Anonymous enum definition, nothing more to do */ |
| 238 | return NULL; |
| 239 | } |
| 240 | |
| 241 | h = crc32(name) % HASH_BUCKETS; |
| 242 | for (sym = symtab[h]; sym; sym = sym->hash_next) { |
| 243 | if (map_to_ns(sym->type) == map_to_ns(type) && |
| 244 | strcmp(name, sym->name) == 0) { |
| 245 | if (is_reference) |
| 246 | /* fall through */ ; |
| 247 | else if (sym->type == type && |
| 248 | equal_list(sym->defn, defn)) { |
| 249 | if (!sym->is_declared && sym->is_override) { |
| 250 | print_location(); |
| 251 | print_type_name(type, name); |
| 252 | fprintf(stderr, " modversion is " |
| 253 | "unchanged\n"); |
| 254 | } |
| 255 | sym->is_declared = 1; |
| 256 | return sym; |
| 257 | } else if (!sym->is_declared) { |
| 258 | if (sym->is_override && flag_preserve) { |
| 259 | print_location(); |
| 260 | fprintf(stderr, "ignoring "); |
| 261 | print_type_name(type, name); |
| 262 | fprintf(stderr, " modversion change\n"); |
| 263 | sym->is_declared = 1; |
| 264 | return sym; |
| 265 | } else { |
| 266 | status = is_unknown_symbol(sym) ? |
| 267 | STATUS_DEFINED : STATUS_MODIFIED; |
| 268 | } |
| 269 | } else { |
| 270 | error_with_pos("redefinition of %s", name); |
| 271 | return sym; |
| 272 | } |
| 273 | break; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | if (sym) { |
| 278 | struct symbol **psym; |
| 279 | |
| 280 | for (psym = &symtab[h]; *psym; psym = &(*psym)->hash_next) { |
| 281 | if (*psym == sym) { |
| 282 | *psym = sym->hash_next; |
| 283 | break; |
| 284 | } |
| 285 | } |
| 286 | --nsyms; |
| 287 | } |
| 288 | |
| 289 | sym = xmalloc(sizeof(*sym)); |
| 290 | sym->name = name; |
| 291 | sym->type = type; |
| 292 | sym->defn = defn; |
| 293 | sym->expansion_trail = NULL; |
| 294 | sym->visited = NULL; |
| 295 | sym->is_extern = is_extern; |
| 296 | |
| 297 | sym->hash_next = symtab[h]; |
| 298 | symtab[h] = sym; |
| 299 | |
| 300 | sym->is_declared = !is_reference; |
| 301 | sym->status = status; |
| 302 | sym->is_override = 0; |
| 303 | |
| 304 | if (flag_debug) { |
| 305 | if (symbol_types[type].name) |
| 306 | fprintf(debugfile, "Defn for %s %s == <", |
| 307 | symbol_types[type].name, name); |
| 308 | else |
| 309 | fprintf(debugfile, "Defn for type%d %s == <", |
| 310 | type, name); |
| 311 | if (is_extern) |
| 312 | fputs("extern ", debugfile); |
| 313 | print_list(debugfile, defn); |
| 314 | fputs(">\n", debugfile); |
| 315 | } |
| 316 | |
| 317 | ++nsyms; |
| 318 | return sym; |
| 319 | } |
| 320 | |
| 321 | struct symbol *add_symbol(const char *name, enum symbol_type type, |
| 322 | struct string_list *defn, int is_extern) |
| 323 | { |
| 324 | return __add_symbol(name, type, defn, is_extern, 0); |
| 325 | } |
| 326 | |
| 327 | static struct symbol *add_reference_symbol(const char *name, enum symbol_type type, |
| 328 | struct string_list *defn, int is_extern) |
| 329 | { |
| 330 | return __add_symbol(name, type, defn, is_extern, 1); |
| 331 | } |
| 332 | |
| 333 | /*----------------------------------------------------------------------*/ |
| 334 | |
| 335 | void free_node(struct string_list *node) |
| 336 | { |
| 337 | free(node->string); |
| 338 | free(node); |
| 339 | } |
| 340 | |
| 341 | void free_list(struct string_list *s, struct string_list *e) |
| 342 | { |
| 343 | while (s != e) { |
| 344 | struct string_list *next = s->next; |
| 345 | free_node(s); |
| 346 | s = next; |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | static struct string_list *mk_node(const char *string) |
| 351 | { |
| 352 | struct string_list *newnode; |
| 353 | |
| 354 | newnode = xmalloc(sizeof(*newnode)); |
| 355 | newnode->string = xstrdup(string); |
| 356 | newnode->tag = SYM_NORMAL; |
| 357 | newnode->next = NULL; |
| 358 | |
| 359 | return newnode; |
| 360 | } |
| 361 | |
| 362 | static struct string_list *concat_list(struct string_list *start, ...) |
| 363 | { |
| 364 | va_list ap; |
| 365 | struct string_list *n, *n2; |
| 366 | |
| 367 | if (!start) |
| 368 | return NULL; |
| 369 | for (va_start(ap, start); (n = va_arg(ap, struct string_list *));) { |
| 370 | for (n2 = n; n2->next; n2 = n2->next) |
| 371 | ; |
| 372 | n2->next = start; |
| 373 | start = n; |
| 374 | } |
| 375 | va_end(ap); |
| 376 | return start; |
| 377 | } |
| 378 | |
| 379 | struct string_list *copy_node(struct string_list *node) |
| 380 | { |
| 381 | struct string_list *newnode; |
| 382 | |
| 383 | newnode = xmalloc(sizeof(*newnode)); |
| 384 | newnode->string = xstrdup(node->string); |
| 385 | newnode->tag = node->tag; |
| 386 | |
| 387 | return newnode; |
| 388 | } |
| 389 | |
| 390 | struct string_list *copy_list_range(struct string_list *start, |
| 391 | struct string_list *end) |
| 392 | { |
| 393 | struct string_list *res, *n; |
| 394 | |
| 395 | if (start == end) |
| 396 | return NULL; |
| 397 | n = res = copy_node(start); |
| 398 | for (start = start->next; start != end; start = start->next) { |
| 399 | n->next = copy_node(start); |
| 400 | n = n->next; |
| 401 | } |
| 402 | n->next = NULL; |
| 403 | return res; |
| 404 | } |
| 405 | |
| 406 | static int equal_list(struct string_list *a, struct string_list *b) |
| 407 | { |
| 408 | while (a && b) { |
| 409 | if (a->tag != b->tag || strcmp(a->string, b->string)) |
| 410 | return 0; |
| 411 | a = a->next; |
| 412 | b = b->next; |
| 413 | } |
| 414 | |
| 415 | return !a && !b; |
| 416 | } |
| 417 | |
| 418 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) |
| 419 | |
| 420 | static struct string_list *read_node(FILE *f) |
| 421 | { |
| 422 | char buffer[256]; |
| 423 | struct string_list node = { |
| 424 | .string = buffer, |
| 425 | .tag = SYM_NORMAL }; |
| 426 | int c; |
| 427 | |
| 428 | while ((c = fgetc(f)) != EOF) { |
| 429 | if (c == ' ') { |
| 430 | if (node.string == buffer) |
| 431 | continue; |
| 432 | break; |
| 433 | } else if (c == '\n') { |
| 434 | if (node.string == buffer) |
| 435 | return NULL; |
| 436 | ungetc(c, f); |
| 437 | break; |
| 438 | } |
| 439 | if (node.string >= buffer + sizeof(buffer) - 1) { |
| 440 | fprintf(stderr, "Token too long\n"); |
| 441 | exit(1); |
| 442 | } |
| 443 | *node.string++ = c; |
| 444 | } |
| 445 | if (node.string == buffer) |
| 446 | return NULL; |
| 447 | *node.string = 0; |
| 448 | node.string = buffer; |
| 449 | |
| 450 | if (node.string[1] == '#') { |
| 451 | size_t n; |
| 452 | |
| 453 | for (n = 0; n < ARRAY_SIZE(symbol_types); n++) { |
| 454 | if (node.string[0] == symbol_types[n].n) { |
| 455 | node.tag = n; |
| 456 | node.string += 2; |
| 457 | return copy_node(&node); |
| 458 | } |
| 459 | } |
| 460 | fprintf(stderr, "Unknown type %c\n", node.string[0]); |
| 461 | exit(1); |
| 462 | } |
| 463 | return copy_node(&node); |
| 464 | } |
| 465 | |
| 466 | static void read_reference(FILE *f) |
| 467 | { |
| 468 | while (!feof(f)) { |
| 469 | struct string_list *defn = NULL; |
| 470 | struct string_list *sym, *def; |
| 471 | int is_extern = 0, is_override = 0; |
| 472 | struct symbol *subsym; |
| 473 | |
| 474 | sym = read_node(f); |
| 475 | if (sym && sym->tag == SYM_NORMAL && |
| 476 | !strcmp(sym->string, "override")) { |
| 477 | is_override = 1; |
| 478 | free_node(sym); |
| 479 | sym = read_node(f); |
| 480 | } |
| 481 | if (!sym) |
| 482 | continue; |
| 483 | def = read_node(f); |
| 484 | if (def && def->tag == SYM_NORMAL && |
| 485 | !strcmp(def->string, "extern")) { |
| 486 | is_extern = 1; |
| 487 | free_node(def); |
| 488 | def = read_node(f); |
| 489 | } |
| 490 | while (def) { |
| 491 | def->next = defn; |
| 492 | defn = def; |
| 493 | def = read_node(f); |
| 494 | } |
| 495 | subsym = add_reference_symbol(xstrdup(sym->string), sym->tag, |
| 496 | defn, is_extern); |
| 497 | subsym->is_override = is_override; |
| 498 | free_node(sym); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | static void print_node(FILE * f, struct string_list *list) |
| 503 | { |
| 504 | if (symbol_types[list->tag].n) { |
| 505 | putc(symbol_types[list->tag].n, f); |
| 506 | putc('#', f); |
| 507 | } |
| 508 | fputs(list->string, f); |
| 509 | } |
| 510 | |
| 511 | static void print_list(FILE * f, struct string_list *list) |
| 512 | { |
| 513 | struct string_list **e, **b; |
| 514 | struct string_list *tmp, **tmp2; |
| 515 | int elem = 1; |
| 516 | |
| 517 | if (list == NULL) { |
| 518 | fputs("(nil)", f); |
| 519 | return; |
| 520 | } |
| 521 | |
| 522 | tmp = list; |
| 523 | while ((tmp = tmp->next) != NULL) |
| 524 | elem++; |
| 525 | |
| 526 | b = alloca(elem * sizeof(*e)); |
| 527 | e = b + elem; |
| 528 | tmp2 = e - 1; |
| 529 | |
| 530 | (*tmp2--) = list; |
| 531 | while ((list = list->next) != NULL) |
| 532 | *(tmp2--) = list; |
| 533 | |
| 534 | while (b != e) { |
| 535 | print_node(f, *b++); |
| 536 | putc(' ', f); |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | static unsigned long expand_and_crc_sym(struct symbol *sym, unsigned long crc) |
| 541 | { |
| 542 | struct string_list *list = sym->defn; |
| 543 | struct string_list **e, **b; |
| 544 | struct string_list *tmp, **tmp2; |
| 545 | int elem = 1; |
| 546 | |
| 547 | if (!list) |
| 548 | return crc; |
| 549 | |
| 550 | tmp = list; |
| 551 | while ((tmp = tmp->next) != NULL) |
| 552 | elem++; |
| 553 | |
| 554 | b = alloca(elem * sizeof(*e)); |
| 555 | e = b + elem; |
| 556 | tmp2 = e - 1; |
| 557 | |
| 558 | *(tmp2--) = list; |
| 559 | while ((list = list->next) != NULL) |
| 560 | *(tmp2--) = list; |
| 561 | |
| 562 | while (b != e) { |
| 563 | struct string_list *cur; |
| 564 | struct symbol *subsym; |
| 565 | |
| 566 | cur = *(b++); |
| 567 | switch (cur->tag) { |
| 568 | case SYM_NORMAL: |
| 569 | if (flag_dump_defs) |
| 570 | fprintf(debugfile, "%s ", cur->string); |
| 571 | crc = partial_crc32(cur->string, crc); |
| 572 | crc = partial_crc32_one(' ', crc); |
| 573 | break; |
| 574 | |
| 575 | case SYM_ENUM_CONST: |
| 576 | case SYM_TYPEDEF: |
| 577 | subsym = find_symbol(cur->string, cur->tag, 0); |
| 578 | /* FIXME: Bad reference files can segfault here. */ |
| 579 | if (subsym->expansion_trail) { |
| 580 | if (flag_dump_defs) |
| 581 | fprintf(debugfile, "%s ", cur->string); |
| 582 | crc = partial_crc32(cur->string, crc); |
| 583 | crc = partial_crc32_one(' ', crc); |
| 584 | } else { |
| 585 | subsym->expansion_trail = expansion_trail; |
| 586 | expansion_trail = subsym; |
| 587 | crc = expand_and_crc_sym(subsym, crc); |
| 588 | } |
| 589 | break; |
| 590 | |
| 591 | case SYM_STRUCT: |
| 592 | case SYM_UNION: |
| 593 | case SYM_ENUM: |
| 594 | subsym = find_symbol(cur->string, cur->tag, 0); |
| 595 | if (!subsym) { |
| 596 | struct string_list *n; |
| 597 | |
| 598 | error_with_pos("expand undefined %s %s", |
| 599 | symbol_types[cur->tag].name, |
| 600 | cur->string); |
| 601 | n = concat_list(mk_node |
| 602 | (symbol_types[cur->tag].name), |
| 603 | mk_node(cur->string), |
| 604 | mk_node("{"), |
| 605 | mk_node("UNKNOWN"), |
| 606 | mk_node("}"), NULL); |
| 607 | subsym = |
| 608 | add_symbol(cur->string, cur->tag, n, 0); |
| 609 | } |
| 610 | if (subsym->expansion_trail) { |
| 611 | if (flag_dump_defs) { |
| 612 | fprintf(debugfile, "%s %s ", |
| 613 | symbol_types[cur->tag].name, |
| 614 | cur->string); |
| 615 | } |
| 616 | |
| 617 | crc = partial_crc32(symbol_types[cur->tag].name, |
| 618 | crc); |
| 619 | crc = partial_crc32_one(' ', crc); |
| 620 | crc = partial_crc32(cur->string, crc); |
| 621 | crc = partial_crc32_one(' ', crc); |
| 622 | } else { |
| 623 | subsym->expansion_trail = expansion_trail; |
| 624 | expansion_trail = subsym; |
| 625 | crc = expand_and_crc_sym(subsym, crc); |
| 626 | } |
| 627 | break; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | { |
| 632 | static struct symbol **end = &visited_symbols; |
| 633 | |
| 634 | if (!sym->visited) { |
| 635 | *end = sym; |
| 636 | end = &sym->visited; |
| 637 | sym->visited = (struct symbol *)-1L; |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | return crc; |
| 642 | } |
| 643 | |
| 644 | void export_symbol(const char *name) |
| 645 | { |
| 646 | struct symbol *sym; |
| 647 | |
| 648 | sym = find_symbol(name, SYM_NORMAL, 0); |
| 649 | if (!sym) |
| 650 | error_with_pos("export undefined symbol %s", name); |
| 651 | else { |
| 652 | unsigned long crc; |
| 653 | int has_changed = 0; |
| 654 | |
| 655 | if (flag_dump_defs) |
| 656 | fprintf(debugfile, "Export %s == <", name); |
| 657 | |
| 658 | expansion_trail = (struct symbol *)-1L; |
| 659 | |
| 660 | sym->expansion_trail = expansion_trail; |
| 661 | expansion_trail = sym; |
| 662 | crc = expand_and_crc_sym(sym, 0xffffffff) ^ 0xffffffff; |
| 663 | |
| 664 | sym = expansion_trail; |
| 665 | while (sym != (struct symbol *)-1L) { |
| 666 | struct symbol *n = sym->expansion_trail; |
| 667 | |
| 668 | if (sym->status != STATUS_UNCHANGED) { |
| 669 | if (!has_changed) { |
| 670 | print_location(); |
| 671 | fprintf(stderr, "%s: %s: modversion " |
| 672 | "changed because of changes " |
| 673 | "in ", flag_preserve ? "error" : |
| 674 | "warning", name); |
| 675 | } else |
| 676 | fprintf(stderr, ", "); |
| 677 | print_type_name(sym->type, sym->name); |
| 678 | if (sym->status == STATUS_DEFINED) |
| 679 | fprintf(stderr, " (became defined)"); |
| 680 | has_changed = 1; |
| 681 | if (flag_preserve) |
| 682 | errors++; |
| 683 | } |
| 684 | sym->expansion_trail = 0; |
| 685 | sym = n; |
| 686 | } |
| 687 | if (has_changed) |
| 688 | fprintf(stderr, "\n"); |
| 689 | |
| 690 | if (flag_dump_defs) |
| 691 | fputs(">\n", debugfile); |
| 692 | |
| 693 | /* Used as a linker script. */ |
| 694 | printf("%s__crc_%s = 0x%08lx ;\n", mod_prefix, name, crc); |
| 695 | } |
| 696 | } |
| 697 | |
| 698 | /*----------------------------------------------------------------------*/ |
| 699 | |
| 700 | static void print_location(void) |
| 701 | { |
| 702 | fprintf(stderr, "%s:%d: ", cur_filename ? : "<stdin>", cur_line); |
| 703 | } |
| 704 | |
| 705 | static void print_type_name(enum symbol_type type, const char *name) |
| 706 | { |
| 707 | if (symbol_types[type].name) |
| 708 | fprintf(stderr, "%s %s", symbol_types[type].name, name); |
| 709 | else |
| 710 | fprintf(stderr, "%s", name); |
| 711 | } |
| 712 | |
| 713 | void error_with_pos(const char *fmt, ...) |
| 714 | { |
| 715 | va_list args; |
| 716 | |
| 717 | if (flag_warnings) { |
| 718 | print_location(); |
| 719 | |
| 720 | va_start(args, fmt); |
| 721 | vfprintf(stderr, fmt, args); |
| 722 | va_end(args); |
| 723 | putc('\n', stderr); |
| 724 | |
| 725 | errors++; |
| 726 | } |
| 727 | } |
| 728 | |
| 729 | static void genksyms_usage(void) |
| 730 | { |
| 731 | fputs("Usage:\n" "genksyms [-adDTwqhV] > /path/to/.tmp_obj.ver\n" "\n" |
| 732 | #ifdef __GNU_LIBRARY__ |
| 733 | " -s, --symbol-prefix Select symbol prefix\n" |
| 734 | " -d, --debug Increment the debug level (repeatable)\n" |
| 735 | " -D, --dump Dump expanded symbol defs (for debugging only)\n" |
| 736 | " -r, --reference file Read reference symbols from a file\n" |
| 737 | " -T, --dump-types file Dump expanded types into file\n" |
| 738 | " -p, --preserve Preserve reference modversions or fail\n" |
| 739 | " -w, --warnings Enable warnings\n" |
| 740 | " -q, --quiet Disable warnings (default)\n" |
| 741 | " -h, --help Print this message\n" |
| 742 | " -V, --version Print the release version\n" |
| 743 | #else /* __GNU_LIBRARY__ */ |
| 744 | " -s Select symbol prefix\n" |
| 745 | " -d Increment the debug level (repeatable)\n" |
| 746 | " -D Dump expanded symbol defs (for debugging only)\n" |
| 747 | " -r file Read reference symbols from a file\n" |
| 748 | " -T file Dump expanded types into file\n" |
| 749 | " -p Preserve reference modversions or fail\n" |
| 750 | " -w Enable warnings\n" |
| 751 | " -q Disable warnings (default)\n" |
| 752 | " -h Print this message\n" |
| 753 | " -V Print the release version\n" |
| 754 | #endif /* __GNU_LIBRARY__ */ |
| 755 | , stderr); |
| 756 | } |
| 757 | |
| 758 | int main(int argc, char **argv) |
| 759 | { |
| 760 | FILE *dumpfile = NULL, *ref_file = NULL; |
| 761 | int o; |
| 762 | |
| 763 | #ifdef __GNU_LIBRARY__ |
| 764 | struct option long_opts[] = { |
| 765 | {"symbol-prefix", 1, 0, 's'}, |
| 766 | {"debug", 0, 0, 'd'}, |
| 767 | {"warnings", 0, 0, 'w'}, |
| 768 | {"quiet", 0, 0, 'q'}, |
| 769 | {"dump", 0, 0, 'D'}, |
| 770 | {"reference", 1, 0, 'r'}, |
| 771 | {"dump-types", 1, 0, 'T'}, |
| 772 | {"preserve", 0, 0, 'p'}, |
| 773 | {"version", 0, 0, 'V'}, |
| 774 | {"help", 0, 0, 'h'}, |
| 775 | {0, 0, 0, 0} |
| 776 | }; |
| 777 | |
| 778 | while ((o = getopt_long(argc, argv, "s:dwqVDr:T:ph", |
| 779 | &long_opts[0], NULL)) != EOF) |
| 780 | #else /* __GNU_LIBRARY__ */ |
| 781 | while ((o = getopt(argc, argv, "s:dwqVDr:T:ph")) != EOF) |
| 782 | #endif /* __GNU_LIBRARY__ */ |
| 783 | switch (o) { |
| 784 | case 's': |
| 785 | mod_prefix = optarg; |
| 786 | break; |
| 787 | case 'd': |
| 788 | flag_debug++; |
| 789 | break; |
| 790 | case 'w': |
| 791 | flag_warnings = 1; |
| 792 | break; |
| 793 | case 'q': |
| 794 | flag_warnings = 0; |
| 795 | break; |
| 796 | case 'V': |
| 797 | fputs("genksyms version 2.5.60\n", stderr); |
| 798 | break; |
| 799 | case 'D': |
| 800 | flag_dump_defs = 1; |
| 801 | break; |
| 802 | case 'r': |
| 803 | flag_reference = 1; |
| 804 | ref_file = fopen(optarg, "r"); |
| 805 | if (!ref_file) { |
| 806 | perror(optarg); |
| 807 | return 1; |
| 808 | } |
| 809 | break; |
| 810 | case 'T': |
| 811 | flag_dump_types = 1; |
| 812 | dumpfile = fopen(optarg, "w"); |
| 813 | if (!dumpfile) { |
| 814 | perror(optarg); |
| 815 | return 1; |
| 816 | } |
| 817 | break; |
| 818 | case 'p': |
| 819 | flag_preserve = 1; |
| 820 | break; |
| 821 | case 'h': |
| 822 | genksyms_usage(); |
| 823 | return 0; |
| 824 | default: |
| 825 | genksyms_usage(); |
| 826 | return 1; |
| 827 | } |
| 828 | { |
| 829 | extern int yydebug; |
| 830 | extern int yy_flex_debug; |
| 831 | |
| 832 | yydebug = (flag_debug > 1); |
| 833 | yy_flex_debug = (flag_debug > 2); |
| 834 | |
| 835 | debugfile = stderr; |
| 836 | /* setlinebuf(debugfile); */ |
| 837 | } |
| 838 | |
| 839 | if (flag_reference) { |
| 840 | read_reference(ref_file); |
| 841 | fclose(ref_file); |
| 842 | } |
| 843 | |
| 844 | yyparse(); |
| 845 | |
| 846 | if (flag_dump_types && visited_symbols) { |
| 847 | while (visited_symbols != (struct symbol *)-1L) { |
| 848 | struct symbol *sym = visited_symbols; |
| 849 | |
| 850 | if (sym->is_override) |
| 851 | fputs("override ", dumpfile); |
| 852 | if (symbol_types[sym->type].n) { |
| 853 | putc(symbol_types[sym->type].n, dumpfile); |
| 854 | putc('#', dumpfile); |
| 855 | } |
| 856 | fputs(sym->name, dumpfile); |
| 857 | putc(' ', dumpfile); |
| 858 | if (sym->is_extern) |
| 859 | fputs("extern ", dumpfile); |
| 860 | print_list(dumpfile, sym->defn); |
| 861 | putc('\n', dumpfile); |
| 862 | |
| 863 | visited_symbols = sym->visited; |
| 864 | sym->visited = NULL; |
| 865 | } |
| 866 | } |
| 867 | |
| 868 | if (flag_debug) { |
| 869 | fprintf(debugfile, "Hash table occupancy %d/%d = %g\n", |
| 870 | nsyms, HASH_BUCKETS, |
| 871 | (double)nsyms / (double)HASH_BUCKETS); |
| 872 | } |
| 873 | |
| 874 | return errors != 0; |
| 875 | } |