| 1 | /* symbols.c -symbol table- |
| 2 | Copyright (C) 1987-2019 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GAS, the GNU Assembler. |
| 5 | |
| 6 | GAS 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 3, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GAS 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. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GAS; see the file COPYING. If not, write to the Free |
| 18 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 19 | 02110-1301, USA. */ |
| 20 | |
| 21 | /* #define DEBUG_SYMS / * to debug symbol list maintenance. */ |
| 22 | |
| 23 | #include "as.h" |
| 24 | #include "safe-ctype.h" |
| 25 | #include "obstack.h" /* For "symbols.h" */ |
| 26 | #include "subsegs.h" |
| 27 | #include "write.h" |
| 28 | |
| 29 | struct symbol_flags |
| 30 | { |
| 31 | /* Whether the symbol is a local_symbol. */ |
| 32 | unsigned int sy_local_symbol : 1; |
| 33 | |
| 34 | /* Weather symbol has been written. */ |
| 35 | unsigned int sy_written : 1; |
| 36 | |
| 37 | /* Whether symbol value has been completely resolved (used during |
| 38 | final pass over symbol table). */ |
| 39 | unsigned int sy_resolved : 1; |
| 40 | |
| 41 | /* Whether the symbol value is currently being resolved (used to |
| 42 | detect loops in symbol dependencies). */ |
| 43 | unsigned int sy_resolving : 1; |
| 44 | |
| 45 | /* Whether the symbol value is used in a reloc. This is used to |
| 46 | ensure that symbols used in relocs are written out, even if they |
| 47 | are local and would otherwise not be. */ |
| 48 | unsigned int sy_used_in_reloc : 1; |
| 49 | |
| 50 | /* Whether the symbol is used as an operand or in an expression. |
| 51 | NOTE: Not all the backends keep this information accurate; |
| 52 | backends which use this bit are responsible for setting it when |
| 53 | a symbol is used in backend routines. */ |
| 54 | unsigned int sy_used : 1; |
| 55 | |
| 56 | /* Whether the symbol can be re-defined. */ |
| 57 | unsigned int sy_volatile : 1; |
| 58 | |
| 59 | /* Whether the symbol is a forward reference. */ |
| 60 | unsigned int sy_forward_ref : 1; |
| 61 | |
| 62 | /* This is set if the symbol is defined in an MRI common section. |
| 63 | We handle such sections as single common symbols, so symbols |
| 64 | defined within them must be treated specially by the relocation |
| 65 | routines. */ |
| 66 | unsigned int sy_mri_common : 1; |
| 67 | |
| 68 | /* This is set if the symbol is set with a .weakref directive. */ |
| 69 | unsigned int sy_weakrefr : 1; |
| 70 | |
| 71 | /* This is set when the symbol is referenced as part of a .weakref |
| 72 | directive, but only if the symbol was not in the symbol table |
| 73 | before. It is cleared as soon as any direct reference to the |
| 74 | symbol is present. */ |
| 75 | unsigned int sy_weakrefd : 1; |
| 76 | }; |
| 77 | |
| 78 | /* The information we keep for a symbol. Note that the symbol table |
| 79 | holds pointers both to this and to local_symbol structures. See |
| 80 | below. */ |
| 81 | |
| 82 | struct symbol |
| 83 | { |
| 84 | /* Symbol flags. */ |
| 85 | struct symbol_flags sy_flags; |
| 86 | |
| 87 | /* BFD symbol */ |
| 88 | asymbol *bsym; |
| 89 | |
| 90 | /* The value of the symbol. */ |
| 91 | expressionS sy_value; |
| 92 | |
| 93 | /* Forwards and (optionally) backwards chain pointers. */ |
| 94 | struct symbol *sy_next; |
| 95 | struct symbol *sy_previous; |
| 96 | |
| 97 | /* Pointer to the frag this symbol is attached to, if any. |
| 98 | Otherwise, NULL. */ |
| 99 | struct frag *sy_frag; |
| 100 | |
| 101 | #ifdef OBJ_SYMFIELD_TYPE |
| 102 | OBJ_SYMFIELD_TYPE sy_obj; |
| 103 | #endif |
| 104 | |
| 105 | #ifdef TC_SYMFIELD_TYPE |
| 106 | TC_SYMFIELD_TYPE sy_tc; |
| 107 | #endif |
| 108 | |
| 109 | #ifdef TARGET_SYMBOL_FIELDS |
| 110 | TARGET_SYMBOL_FIELDS |
| 111 | #endif |
| 112 | }; |
| 113 | |
| 114 | /* A pointer in the symbol may point to either a complete symbol |
| 115 | (struct symbol above) or to a local symbol (struct local_symbol |
| 116 | defined here). The symbol code can detect the case by examining |
| 117 | the first field. It is always NULL for a local symbol. |
| 118 | |
| 119 | We do this because we ordinarily only need a small amount of |
| 120 | information for a local symbol. The symbol table takes up a lot of |
| 121 | space, and storing less information for a local symbol can make a |
| 122 | big difference in assembler memory usage when assembling a large |
| 123 | file. */ |
| 124 | |
| 125 | struct local_symbol |
| 126 | { |
| 127 | /* Symbol flags. Only sy_local_symbol and sy_resolved are relevant. */ |
| 128 | struct symbol_flags lsy_flags; |
| 129 | |
| 130 | /* The symbol section. This also serves as a flag. If this is |
| 131 | reg_section, then this symbol has been converted into a regular |
| 132 | symbol, and lsy_sym points to it. */ |
| 133 | segT lsy_section; |
| 134 | |
| 135 | /* The symbol name. */ |
| 136 | const char *lsy_name; |
| 137 | |
| 138 | /* The symbol frag or the real symbol, depending upon the value in |
| 139 | lsy_section. */ |
| 140 | union |
| 141 | { |
| 142 | fragS *lsy_frag; |
| 143 | symbolS *lsy_sym; |
| 144 | } u; |
| 145 | |
| 146 | /* The value of the symbol. */ |
| 147 | valueT lsy_value; |
| 148 | |
| 149 | #ifdef TC_LOCAL_SYMFIELD_TYPE |
| 150 | TC_LOCAL_SYMFIELD_TYPE lsy_tc; |
| 151 | #endif |
| 152 | }; |
| 153 | |
| 154 | #define local_symbol_converted_p(l) ((l)->lsy_section == reg_section) |
| 155 | #define local_symbol_mark_converted(l) ((l)->lsy_section = reg_section) |
| 156 | #define local_symbol_resolved_p(l) ((l)->lsy_flags.sy_resolved) |
| 157 | #define local_symbol_mark_resolved(l) ((l)->lsy_flags.sy_resolved = 1) |
| 158 | #define local_symbol_get_frag(l) ((l)->u.lsy_frag) |
| 159 | #define local_symbol_set_frag(l, f) ((l)->u.lsy_frag = (f)) |
| 160 | #define local_symbol_get_real_symbol(l) ((l)->u.lsy_sym) |
| 161 | #define local_symbol_set_real_symbol(l, s) ((l)->u.lsy_sym = (s)) |
| 162 | |
| 163 | /* This is non-zero if symbols are case sensitive, which is the |
| 164 | default. */ |
| 165 | int symbols_case_sensitive = 1; |
| 166 | |
| 167 | #ifndef WORKING_DOT_WORD |
| 168 | extern int new_broken_words; |
| 169 | #endif |
| 170 | |
| 171 | /* symbol-name => struct symbol pointer */ |
| 172 | static struct hash_control *sy_hash; |
| 173 | |
| 174 | /* Table of local symbols. */ |
| 175 | static struct hash_control *local_hash; |
| 176 | |
| 177 | /* Below are commented in "symbols.h". */ |
| 178 | symbolS *symbol_rootP; |
| 179 | symbolS *symbol_lastP; |
| 180 | symbolS abs_symbol; |
| 181 | symbolS dot_symbol; |
| 182 | |
| 183 | #ifdef DEBUG_SYMS |
| 184 | #define debug_verify_symchain verify_symbol_chain |
| 185 | #else |
| 186 | #define debug_verify_symchain(root, last) ((void) 0) |
| 187 | #endif |
| 188 | |
| 189 | #define DOLLAR_LABEL_CHAR '\001' |
| 190 | #define LOCAL_LABEL_CHAR '\002' |
| 191 | |
| 192 | #ifndef TC_LABEL_IS_LOCAL |
| 193 | #define TC_LABEL_IS_LOCAL(name) 0 |
| 194 | #endif |
| 195 | |
| 196 | struct obstack notes; |
| 197 | #ifdef TE_PE |
| 198 | /* The name of an external symbol which is |
| 199 | used to make weak PE symbol names unique. */ |
| 200 | const char * an_external_name; |
| 201 | #endif |
| 202 | |
| 203 | static const char *save_symbol_name (const char *); |
| 204 | static void fb_label_init (void); |
| 205 | static long dollar_label_instance (long); |
| 206 | static long fb_label_instance (long); |
| 207 | |
| 208 | static void print_binary (FILE *, const char *, expressionS *); |
| 209 | |
| 210 | /* Return a pointer to a new symbol. Die if we can't make a new |
| 211 | symbol. Fill in the symbol's values. Add symbol to end of symbol |
| 212 | chain. |
| 213 | |
| 214 | This function should be called in the general case of creating a |
| 215 | symbol. However, if the output file symbol table has already been |
| 216 | set, and you are certain that this symbol won't be wanted in the |
| 217 | output file, you can call symbol_create. */ |
| 218 | |
| 219 | symbolS * |
| 220 | symbol_new (const char *name, segT segment, valueT valu, fragS *frag) |
| 221 | { |
| 222 | symbolS *symbolP = symbol_create (name, segment, valu, frag); |
| 223 | |
| 224 | /* Link to end of symbol chain. */ |
| 225 | { |
| 226 | extern int symbol_table_frozen; |
| 227 | if (symbol_table_frozen) |
| 228 | abort (); |
| 229 | } |
| 230 | symbol_append (symbolP, symbol_lastP, &symbol_rootP, &symbol_lastP); |
| 231 | |
| 232 | return symbolP; |
| 233 | } |
| 234 | |
| 235 | /* Save a symbol name on a permanent obstack, and convert it according |
| 236 | to the object file format. */ |
| 237 | |
| 238 | static const char * |
| 239 | save_symbol_name (const char *name) |
| 240 | { |
| 241 | size_t name_length; |
| 242 | char *ret; |
| 243 | |
| 244 | gas_assert (name != NULL); |
| 245 | name_length = strlen (name) + 1; /* +1 for \0. */ |
| 246 | obstack_grow (¬es, name, name_length); |
| 247 | ret = (char *) obstack_finish (¬es); |
| 248 | |
| 249 | #ifdef tc_canonicalize_symbol_name |
| 250 | ret = tc_canonicalize_symbol_name (ret); |
| 251 | #endif |
| 252 | |
| 253 | if (! symbols_case_sensitive) |
| 254 | { |
| 255 | char *s; |
| 256 | |
| 257 | for (s = ret; *s != '\0'; s++) |
| 258 | *s = TOUPPER (*s); |
| 259 | } |
| 260 | |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | symbolS * |
| 265 | symbol_create (const char *name, /* It is copied, the caller can destroy/modify. */ |
| 266 | segT segment, /* Segment identifier (SEG_<something>). */ |
| 267 | valueT valu, /* Symbol value. */ |
| 268 | fragS *frag /* Associated fragment. */) |
| 269 | { |
| 270 | const char *preserved_copy_of_name; |
| 271 | symbolS *symbolP; |
| 272 | |
| 273 | preserved_copy_of_name = save_symbol_name (name); |
| 274 | |
| 275 | symbolP = (symbolS *) obstack_alloc (¬es, sizeof (symbolS)); |
| 276 | |
| 277 | /* symbol must be born in some fixed state. This seems as good as any. */ |
| 278 | memset (symbolP, 0, sizeof (symbolS)); |
| 279 | |
| 280 | symbolP->bsym = bfd_make_empty_symbol (stdoutput); |
| 281 | if (symbolP->bsym == NULL) |
| 282 | as_fatal ("bfd_make_empty_symbol: %s", bfd_errmsg (bfd_get_error ())); |
| 283 | S_SET_NAME (symbolP, preserved_copy_of_name); |
| 284 | |
| 285 | S_SET_SEGMENT (symbolP, segment); |
| 286 | S_SET_VALUE (symbolP, valu); |
| 287 | symbol_clear_list_pointers (symbolP); |
| 288 | |
| 289 | symbolP->sy_frag = frag; |
| 290 | |
| 291 | obj_symbol_new_hook (symbolP); |
| 292 | |
| 293 | #ifdef tc_symbol_new_hook |
| 294 | tc_symbol_new_hook (symbolP); |
| 295 | #endif |
| 296 | |
| 297 | return symbolP; |
| 298 | } |
| 299 | \f |
| 300 | |
| 301 | /* Local symbol support. If we can get away with it, we keep only a |
| 302 | small amount of information for local symbols. */ |
| 303 | |
| 304 | static symbolS *local_symbol_convert (struct local_symbol *); |
| 305 | |
| 306 | /* Used for statistics. */ |
| 307 | |
| 308 | static unsigned long local_symbol_count; |
| 309 | static unsigned long local_symbol_conversion_count; |
| 310 | |
| 311 | /* This macro is called with a symbol argument passed by reference. |
| 312 | It returns whether this is a local symbol. If necessary, it |
| 313 | changes its argument to the real symbol. */ |
| 314 | |
| 315 | #define LOCAL_SYMBOL_CHECK(s) \ |
| 316 | (s->sy_flags.sy_local_symbol \ |
| 317 | ? (local_symbol_converted_p ((struct local_symbol *) s) \ |
| 318 | ? (s = local_symbol_get_real_symbol ((struct local_symbol *) s), \ |
| 319 | 0) \ |
| 320 | : 1) \ |
| 321 | : 0) |
| 322 | |
| 323 | /* Create a local symbol and insert it into the local hash table. */ |
| 324 | |
| 325 | struct local_symbol * |
| 326 | local_symbol_make (const char *name, segT section, valueT val, fragS *frag) |
| 327 | { |
| 328 | const char *name_copy; |
| 329 | struct local_symbol *ret; |
| 330 | |
| 331 | ++local_symbol_count; |
| 332 | |
| 333 | name_copy = save_symbol_name (name); |
| 334 | |
| 335 | ret = (struct local_symbol *) obstack_alloc (¬es, sizeof *ret); |
| 336 | ret->lsy_flags.sy_local_symbol = 1; |
| 337 | ret->lsy_flags.sy_resolved = 0; |
| 338 | ret->lsy_name = name_copy; |
| 339 | ret->lsy_section = section; |
| 340 | local_symbol_set_frag (ret, frag); |
| 341 | ret->lsy_value = val; |
| 342 | |
| 343 | hash_jam (local_hash, name_copy, (void *) ret); |
| 344 | |
| 345 | return ret; |
| 346 | } |
| 347 | |
| 348 | /* Convert a local symbol into a real symbol. Note that we do not |
| 349 | reclaim the space used by the local symbol. */ |
| 350 | |
| 351 | static symbolS * |
| 352 | local_symbol_convert (struct local_symbol *locsym) |
| 353 | { |
| 354 | symbolS *ret; |
| 355 | |
| 356 | gas_assert (locsym->lsy_flags.sy_local_symbol); |
| 357 | if (local_symbol_converted_p (locsym)) |
| 358 | return local_symbol_get_real_symbol (locsym); |
| 359 | |
| 360 | ++local_symbol_conversion_count; |
| 361 | |
| 362 | ret = symbol_new (locsym->lsy_name, locsym->lsy_section, locsym->lsy_value, |
| 363 | local_symbol_get_frag (locsym)); |
| 364 | |
| 365 | if (local_symbol_resolved_p (locsym)) |
| 366 | ret->sy_flags.sy_resolved = 1; |
| 367 | |
| 368 | /* Local symbols are always either defined or used. */ |
| 369 | ret->sy_flags.sy_used = 1; |
| 370 | |
| 371 | #ifdef TC_LOCAL_SYMFIELD_CONVERT |
| 372 | TC_LOCAL_SYMFIELD_CONVERT (locsym, ret); |
| 373 | #endif |
| 374 | |
| 375 | symbol_table_insert (ret); |
| 376 | |
| 377 | local_symbol_mark_converted (locsym); |
| 378 | local_symbol_set_real_symbol (locsym, ret); |
| 379 | |
| 380 | hash_jam (local_hash, locsym->lsy_name, NULL); |
| 381 | |
| 382 | return ret; |
| 383 | } |
| 384 | \f |
| 385 | static void |
| 386 | define_sym_at_dot (symbolS *symbolP) |
| 387 | { |
| 388 | symbolP->sy_frag = frag_now; |
| 389 | S_SET_VALUE (symbolP, (valueT) frag_now_fix ()); |
| 390 | S_SET_SEGMENT (symbolP, now_seg); |
| 391 | } |
| 392 | |
| 393 | /* We have just seen "<name>:". |
| 394 | Creates a struct symbol unless it already exists. |
| 395 | |
| 396 | Gripes if we are redefining a symbol incompatibly (and ignores it). */ |
| 397 | |
| 398 | symbolS * |
| 399 | colon (/* Just seen "x:" - rattle symbols & frags. */ |
| 400 | const char *sym_name /* Symbol name, as a canonical string. */ |
| 401 | /* We copy this string: OK to alter later. */) |
| 402 | { |
| 403 | symbolS *symbolP; /* Symbol we are working with. */ |
| 404 | |
| 405 | /* Sun local labels go out of scope whenever a non-local symbol is |
| 406 | defined. */ |
| 407 | if (LOCAL_LABELS_DOLLAR |
| 408 | && !bfd_is_local_label_name (stdoutput, sym_name)) |
| 409 | dollar_label_clear (); |
| 410 | |
| 411 | #ifndef WORKING_DOT_WORD |
| 412 | if (new_broken_words) |
| 413 | { |
| 414 | struct broken_word *a; |
| 415 | int possible_bytes; |
| 416 | fragS *frag_tmp; |
| 417 | char *frag_opcode; |
| 418 | |
| 419 | if (now_seg == absolute_section) |
| 420 | { |
| 421 | as_bad (_("cannot define symbol `%s' in absolute section"), sym_name); |
| 422 | return NULL; |
| 423 | } |
| 424 | |
| 425 | possible_bytes = (md_short_jump_size |
| 426 | + new_broken_words * md_long_jump_size); |
| 427 | |
| 428 | frag_tmp = frag_now; |
| 429 | frag_opcode = frag_var (rs_broken_word, |
| 430 | possible_bytes, |
| 431 | possible_bytes, |
| 432 | (relax_substateT) 0, |
| 433 | (symbolS *) broken_words, |
| 434 | (offsetT) 0, |
| 435 | NULL); |
| 436 | |
| 437 | /* We want to store the pointer to where to insert the jump |
| 438 | table in the fr_opcode of the rs_broken_word frag. This |
| 439 | requires a little hackery. */ |
| 440 | while (frag_tmp |
| 441 | && (frag_tmp->fr_type != rs_broken_word |
| 442 | || frag_tmp->fr_opcode)) |
| 443 | frag_tmp = frag_tmp->fr_next; |
| 444 | know (frag_tmp); |
| 445 | frag_tmp->fr_opcode = frag_opcode; |
| 446 | new_broken_words = 0; |
| 447 | |
| 448 | for (a = broken_words; a && a->dispfrag == 0; a = a->next_broken_word) |
| 449 | a->dispfrag = frag_tmp; |
| 450 | } |
| 451 | #endif /* WORKING_DOT_WORD */ |
| 452 | |
| 453 | #ifdef obj_frob_colon |
| 454 | obj_frob_colon (sym_name); |
| 455 | #endif |
| 456 | |
| 457 | if ((symbolP = symbol_find (sym_name)) != 0) |
| 458 | { |
| 459 | S_CLEAR_WEAKREFR (symbolP); |
| 460 | #ifdef RESOLVE_SYMBOL_REDEFINITION |
| 461 | if (RESOLVE_SYMBOL_REDEFINITION (symbolP)) |
| 462 | return symbolP; |
| 463 | #endif |
| 464 | /* Now check for undefined symbols. */ |
| 465 | if (LOCAL_SYMBOL_CHECK (symbolP)) |
| 466 | { |
| 467 | struct local_symbol *locsym = (struct local_symbol *) symbolP; |
| 468 | |
| 469 | if (locsym->lsy_section != undefined_section |
| 470 | && (local_symbol_get_frag (locsym) != frag_now |
| 471 | || locsym->lsy_section != now_seg |
| 472 | || locsym->lsy_value != frag_now_fix ())) |
| 473 | { |
| 474 | as_bad (_("symbol `%s' is already defined"), sym_name); |
| 475 | return symbolP; |
| 476 | } |
| 477 | |
| 478 | locsym->lsy_section = now_seg; |
| 479 | local_symbol_set_frag (locsym, frag_now); |
| 480 | locsym->lsy_value = frag_now_fix (); |
| 481 | } |
| 482 | else if (!(S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP)) |
| 483 | || S_IS_COMMON (symbolP) |
| 484 | || S_IS_VOLATILE (symbolP)) |
| 485 | { |
| 486 | if (S_IS_VOLATILE (symbolP)) |
| 487 | { |
| 488 | symbolP = symbol_clone (symbolP, 1); |
| 489 | S_SET_VALUE (symbolP, 0); |
| 490 | S_CLEAR_VOLATILE (symbolP); |
| 491 | } |
| 492 | if (S_GET_VALUE (symbolP) == 0) |
| 493 | { |
| 494 | define_sym_at_dot (symbolP); |
| 495 | #ifdef N_UNDF |
| 496 | know (N_UNDF == 0); |
| 497 | #endif /* if we have one, it better be zero. */ |
| 498 | |
| 499 | } |
| 500 | else |
| 501 | { |
| 502 | /* There are still several cases to check: |
| 503 | |
| 504 | A .comm/.lcomm symbol being redefined as initialized |
| 505 | data is OK |
| 506 | |
| 507 | A .comm/.lcomm symbol being redefined with a larger |
| 508 | size is also OK |
| 509 | |
| 510 | This only used to be allowed on VMS gas, but Sun cc |
| 511 | on the sparc also depends on it. */ |
| 512 | |
| 513 | if (((!S_IS_DEBUG (symbolP) |
| 514 | && (!S_IS_DEFINED (symbolP) || S_IS_COMMON (symbolP)) |
| 515 | && S_IS_EXTERNAL (symbolP)) |
| 516 | || S_GET_SEGMENT (symbolP) == bss_section) |
| 517 | && (now_seg == data_section |
| 518 | || now_seg == bss_section |
| 519 | || now_seg == S_GET_SEGMENT (symbolP))) |
| 520 | { |
| 521 | /* Select which of the 2 cases this is. */ |
| 522 | if (now_seg != data_section) |
| 523 | { |
| 524 | /* New .comm for prev .comm symbol. |
| 525 | |
| 526 | If the new size is larger we just change its |
| 527 | value. If the new size is smaller, we ignore |
| 528 | this symbol. */ |
| 529 | if (S_GET_VALUE (symbolP) |
| 530 | < ((unsigned) frag_now_fix ())) |
| 531 | { |
| 532 | S_SET_VALUE (symbolP, (valueT) frag_now_fix ()); |
| 533 | } |
| 534 | } |
| 535 | else |
| 536 | { |
| 537 | /* It is a .comm/.lcomm being converted to initialized |
| 538 | data. */ |
| 539 | define_sym_at_dot (symbolP); |
| 540 | } |
| 541 | } |
| 542 | else |
| 543 | { |
| 544 | #if (!defined (OBJ_AOUT) && !defined (OBJ_MAYBE_AOUT)) |
| 545 | static const char *od_buf = ""; |
| 546 | #else |
| 547 | char od_buf[100]; |
| 548 | od_buf[0] = '\0'; |
| 549 | if (OUTPUT_FLAVOR == bfd_target_aout_flavour) |
| 550 | sprintf (od_buf, "%d.%d.", |
| 551 | S_GET_OTHER (symbolP), |
| 552 | S_GET_DESC (symbolP)); |
| 553 | #endif |
| 554 | as_bad (_("symbol `%s' is already defined as \"%s\"/%s%ld"), |
| 555 | sym_name, |
| 556 | segment_name (S_GET_SEGMENT (symbolP)), |
| 557 | od_buf, |
| 558 | (long) S_GET_VALUE (symbolP)); |
| 559 | } |
| 560 | } /* if the undefined symbol has no value */ |
| 561 | } |
| 562 | else |
| 563 | { |
| 564 | /* Don't blow up if the definition is the same. */ |
| 565 | if (!(frag_now == symbolP->sy_frag |
| 566 | && S_GET_VALUE (symbolP) == frag_now_fix () |
| 567 | && S_GET_SEGMENT (symbolP) == now_seg)) |
| 568 | { |
| 569 | as_bad (_("symbol `%s' is already defined"), sym_name); |
| 570 | symbolP = symbol_clone (symbolP, 0); |
| 571 | define_sym_at_dot (symbolP); |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | } |
| 576 | else if (! flag_keep_locals && bfd_is_local_label_name (stdoutput, sym_name)) |
| 577 | { |
| 578 | symbolP = (symbolS *) local_symbol_make (sym_name, now_seg, |
| 579 | (valueT) frag_now_fix (), |
| 580 | frag_now); |
| 581 | } |
| 582 | else |
| 583 | { |
| 584 | symbolP = symbol_new (sym_name, now_seg, (valueT) frag_now_fix (), |
| 585 | frag_now); |
| 586 | |
| 587 | symbol_table_insert (symbolP); |
| 588 | } |
| 589 | |
| 590 | if (mri_common_symbol != NULL) |
| 591 | { |
| 592 | /* This symbol is actually being defined within an MRI common |
| 593 | section. This requires special handling. */ |
| 594 | if (LOCAL_SYMBOL_CHECK (symbolP)) |
| 595 | symbolP = local_symbol_convert ((struct local_symbol *) symbolP); |
| 596 | symbolP->sy_value.X_op = O_symbol; |
| 597 | symbolP->sy_value.X_add_symbol = mri_common_symbol; |
| 598 | symbolP->sy_value.X_add_number = S_GET_VALUE (mri_common_symbol); |
| 599 | symbolP->sy_frag = &zero_address_frag; |
| 600 | S_SET_SEGMENT (symbolP, expr_section); |
| 601 | symbolP->sy_flags.sy_mri_common = 1; |
| 602 | } |
| 603 | |
| 604 | #ifdef tc_frob_label |
| 605 | tc_frob_label (symbolP); |
| 606 | #endif |
| 607 | #ifdef obj_frob_label |
| 608 | obj_frob_label (symbolP); |
| 609 | #endif |
| 610 | |
| 611 | return symbolP; |
| 612 | } |
| 613 | \f |
| 614 | /* Die if we can't insert the symbol. */ |
| 615 | |
| 616 | void |
| 617 | symbol_table_insert (symbolS *symbolP) |
| 618 | { |
| 619 | const char *error_string; |
| 620 | |
| 621 | know (symbolP); |
| 622 | know (S_GET_NAME (symbolP)); |
| 623 | |
| 624 | if (LOCAL_SYMBOL_CHECK (symbolP)) |
| 625 | { |
| 626 | error_string = hash_jam (local_hash, S_GET_NAME (symbolP), |
| 627 | (void *) symbolP); |
| 628 | if (error_string != NULL) |
| 629 | as_fatal (_("inserting \"%s\" into symbol table failed: %s"), |
| 630 | S_GET_NAME (symbolP), error_string); |
| 631 | return; |
| 632 | } |
| 633 | |
| 634 | if ((error_string = hash_jam (sy_hash, S_GET_NAME (symbolP), (void *) symbolP))) |
| 635 | { |
| 636 | as_fatal (_("inserting \"%s\" into symbol table failed: %s"), |
| 637 | S_GET_NAME (symbolP), error_string); |
| 638 | } /* on error */ |
| 639 | } |
| 640 | \f |
| 641 | /* If a symbol name does not exist, create it as undefined, and insert |
| 642 | it into the symbol table. Return a pointer to it. */ |
| 643 | |
| 644 | symbolS * |
| 645 | symbol_find_or_make (const char *name) |
| 646 | { |
| 647 | symbolS *symbolP; |
| 648 | |
| 649 | symbolP = symbol_find (name); |
| 650 | |
| 651 | if (symbolP == NULL) |
| 652 | { |
| 653 | if (! flag_keep_locals && bfd_is_local_label_name (stdoutput, name)) |
| 654 | { |
| 655 | symbolP = md_undefined_symbol ((char *) name); |
| 656 | if (symbolP != NULL) |
| 657 | return symbolP; |
| 658 | |
| 659 | symbolP = (symbolS *) local_symbol_make (name, undefined_section, |
| 660 | (valueT) 0, |
| 661 | &zero_address_frag); |
| 662 | return symbolP; |
| 663 | } |
| 664 | |
| 665 | symbolP = symbol_make (name); |
| 666 | |
| 667 | symbol_table_insert (symbolP); |
| 668 | } /* if symbol wasn't found */ |
| 669 | |
| 670 | return (symbolP); |
| 671 | } |
| 672 | |
| 673 | symbolS * |
| 674 | symbol_make (const char *name) |
| 675 | { |
| 676 | symbolS *symbolP; |
| 677 | |
| 678 | /* Let the machine description default it, e.g. for register names. */ |
| 679 | symbolP = md_undefined_symbol ((char *) name); |
| 680 | |
| 681 | if (!symbolP) |
| 682 | symbolP = symbol_new (name, undefined_section, (valueT) 0, &zero_address_frag); |
| 683 | |
| 684 | return (symbolP); |
| 685 | } |
| 686 | |
| 687 | symbolS * |
| 688 | symbol_clone (symbolS *orgsymP, int replace) |
| 689 | { |
| 690 | symbolS *newsymP; |
| 691 | asymbol *bsymorg, *bsymnew; |
| 692 | |
| 693 | /* Make sure we never clone the dot special symbol. */ |
| 694 | gas_assert (orgsymP != &dot_symbol); |
| 695 | |
| 696 | /* Running local_symbol_convert on a clone that's not the one currently |
| 697 | in local_hash would incorrectly replace the hash entry. Thus the |
| 698 | symbol must be converted here. Note that the rest of the function |
| 699 | depends on not encountering an unconverted symbol. */ |
| 700 | if (LOCAL_SYMBOL_CHECK (orgsymP)) |
| 701 | orgsymP = local_symbol_convert ((struct local_symbol *) orgsymP); |
| 702 | bsymorg = orgsymP->bsym; |
| 703 | |
| 704 | newsymP = (symbolS *) obstack_alloc (¬es, sizeof (*newsymP)); |
| 705 | *newsymP = *orgsymP; |
| 706 | bsymnew = bfd_make_empty_symbol (bfd_asymbol_bfd (bsymorg)); |
| 707 | if (bsymnew == NULL) |
| 708 | as_fatal ("bfd_make_empty_symbol: %s", bfd_errmsg (bfd_get_error ())); |
| 709 | newsymP->bsym = bsymnew; |
| 710 | bsymnew->name = bsymorg->name; |
| 711 | bsymnew->flags = bsymorg->flags & ~BSF_SECTION_SYM; |
| 712 | bsymnew->section = bsymorg->section; |
| 713 | bfd_copy_private_symbol_data (bfd_asymbol_bfd (bsymorg), bsymorg, |
| 714 | bfd_asymbol_bfd (bsymnew), bsymnew); |
| 715 | |
| 716 | #ifdef obj_symbol_clone_hook |
| 717 | obj_symbol_clone_hook (newsymP, orgsymP); |
| 718 | #endif |
| 719 | |
| 720 | #ifdef tc_symbol_clone_hook |
| 721 | tc_symbol_clone_hook (newsymP, orgsymP); |
| 722 | #endif |
| 723 | |
| 724 | if (replace) |
| 725 | { |
| 726 | if (symbol_rootP == orgsymP) |
| 727 | symbol_rootP = newsymP; |
| 728 | else if (orgsymP->sy_previous) |
| 729 | { |
| 730 | orgsymP->sy_previous->sy_next = newsymP; |
| 731 | orgsymP->sy_previous = NULL; |
| 732 | } |
| 733 | if (symbol_lastP == orgsymP) |
| 734 | symbol_lastP = newsymP; |
| 735 | else if (orgsymP->sy_next) |
| 736 | orgsymP->sy_next->sy_previous = newsymP; |
| 737 | |
| 738 | /* Symbols that won't be output can't be external. */ |
| 739 | S_CLEAR_EXTERNAL (orgsymP); |
| 740 | orgsymP->sy_previous = orgsymP->sy_next = orgsymP; |
| 741 | debug_verify_symchain (symbol_rootP, symbol_lastP); |
| 742 | |
| 743 | symbol_table_insert (newsymP); |
| 744 | } |
| 745 | else |
| 746 | { |
| 747 | /* Symbols that won't be output can't be external. */ |
| 748 | S_CLEAR_EXTERNAL (newsymP); |
| 749 | newsymP->sy_previous = newsymP->sy_next = newsymP; |
| 750 | } |
| 751 | |
| 752 | return newsymP; |
| 753 | } |
| 754 | |
| 755 | /* If S is a local symbol that has been converted, return the |
| 756 | converted symbol. Otherwise return S. */ |
| 757 | |
| 758 | static inline symbolS * |
| 759 | get_real_sym (symbolS *s) |
| 760 | { |
| 761 | if (s != NULL |
| 762 | && s->sy_flags.sy_local_symbol |
| 763 | && local_symbol_converted_p ((struct local_symbol *) s)) |
| 764 | s = local_symbol_get_real_symbol ((struct local_symbol *) s); |
| 765 | return s; |
| 766 | } |
| 767 | |
| 768 | /* Referenced symbols, if they are forward references, need to be cloned |
| 769 | (without replacing the original) so that the value of the referenced |
| 770 | symbols at the point of use is saved by the clone. */ |
| 771 | |
| 772 | #undef symbol_clone_if_forward_ref |
| 773 | symbolS * |
| 774 | symbol_clone_if_forward_ref (symbolS *symbolP, int is_forward) |
| 775 | { |
| 776 | if (symbolP && !LOCAL_SYMBOL_CHECK (symbolP)) |
| 777 | { |
| 778 | symbolS *orig_add_symbol = get_real_sym (symbolP->sy_value.X_add_symbol); |
| 779 | symbolS *orig_op_symbol = get_real_sym (symbolP->sy_value.X_op_symbol); |
| 780 | symbolS *add_symbol = orig_add_symbol; |
| 781 | symbolS *op_symbol = orig_op_symbol; |
| 782 | |
| 783 | if (symbolP->sy_flags.sy_forward_ref) |
| 784 | is_forward = 1; |
| 785 | |
| 786 | if (is_forward) |
| 787 | { |
| 788 | /* assign_symbol() clones volatile symbols; pre-existing expressions |
| 789 | hold references to the original instance, but want the current |
| 790 | value. Just repeat the lookup. */ |
| 791 | if (add_symbol && S_IS_VOLATILE (add_symbol)) |
| 792 | add_symbol = symbol_find_exact (S_GET_NAME (add_symbol)); |
| 793 | if (op_symbol && S_IS_VOLATILE (op_symbol)) |
| 794 | op_symbol = symbol_find_exact (S_GET_NAME (op_symbol)); |
| 795 | } |
| 796 | |
| 797 | /* Re-using sy_resolving here, as this routine cannot get called from |
| 798 | symbol resolution code. */ |
| 799 | if ((symbolP->bsym->section == expr_section |
| 800 | || symbolP->sy_flags.sy_forward_ref) |
| 801 | && !symbolP->sy_flags.sy_resolving) |
| 802 | { |
| 803 | symbolP->sy_flags.sy_resolving = 1; |
| 804 | add_symbol = symbol_clone_if_forward_ref (add_symbol, is_forward); |
| 805 | op_symbol = symbol_clone_if_forward_ref (op_symbol, is_forward); |
| 806 | symbolP->sy_flags.sy_resolving = 0; |
| 807 | } |
| 808 | |
| 809 | if (symbolP->sy_flags.sy_forward_ref |
| 810 | || add_symbol != orig_add_symbol |
| 811 | || op_symbol != orig_op_symbol) |
| 812 | { |
| 813 | if (symbolP != &dot_symbol) |
| 814 | { |
| 815 | symbolP = symbol_clone (symbolP, 0); |
| 816 | symbolP->sy_flags.sy_resolving = 0; |
| 817 | } |
| 818 | else |
| 819 | { |
| 820 | symbolP = symbol_temp_new_now (); |
| 821 | #ifdef tc_new_dot_label |
| 822 | tc_new_dot_label (symbolP); |
| 823 | #endif |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | symbolP->sy_value.X_add_symbol = add_symbol; |
| 828 | symbolP->sy_value.X_op_symbol = op_symbol; |
| 829 | } |
| 830 | |
| 831 | return symbolP; |
| 832 | } |
| 833 | |
| 834 | symbolS * |
| 835 | symbol_temp_new (segT seg, valueT ofs, fragS *frag) |
| 836 | { |
| 837 | return symbol_new (FAKE_LABEL_NAME, seg, ofs, frag); |
| 838 | } |
| 839 | |
| 840 | symbolS * |
| 841 | symbol_temp_new_now (void) |
| 842 | { |
| 843 | return symbol_temp_new (now_seg, frag_now_fix (), frag_now); |
| 844 | } |
| 845 | |
| 846 | symbolS * |
| 847 | symbol_temp_make (void) |
| 848 | { |
| 849 | return symbol_make (FAKE_LABEL_NAME); |
| 850 | } |
| 851 | |
| 852 | /* Implement symbol table lookup. |
| 853 | In: A symbol's name as a string: '\0' can't be part of a symbol name. |
| 854 | Out: NULL if the name was not in the symbol table, else the address |
| 855 | of a struct symbol associated with that name. */ |
| 856 | |
| 857 | symbolS * |
| 858 | symbol_find_exact (const char *name) |
| 859 | { |
| 860 | return symbol_find_exact_noref (name, 0); |
| 861 | } |
| 862 | |
| 863 | symbolS * |
| 864 | symbol_find_exact_noref (const char *name, int noref) |
| 865 | { |
| 866 | struct local_symbol *locsym; |
| 867 | symbolS* sym; |
| 868 | |
| 869 | locsym = (struct local_symbol *) hash_find (local_hash, name); |
| 870 | if (locsym != NULL) |
| 871 | return (symbolS *) locsym; |
| 872 | |
| 873 | sym = ((symbolS *) hash_find (sy_hash, name)); |
| 874 | |
| 875 | /* Any references to the symbol, except for the reference in |
| 876 | .weakref, must clear this flag, such that the symbol does not |
| 877 | turn into a weak symbol. Note that we don't have to handle the |
| 878 | local_symbol case, since a weakrefd is always promoted out of the |
| 879 | local_symbol table when it is turned into a weak symbol. */ |
| 880 | if (sym && ! noref) |
| 881 | S_CLEAR_WEAKREFD (sym); |
| 882 | |
| 883 | return sym; |
| 884 | } |
| 885 | |
| 886 | symbolS * |
| 887 | symbol_find (const char *name) |
| 888 | { |
| 889 | return symbol_find_noref (name, 0); |
| 890 | } |
| 891 | |
| 892 | symbolS * |
| 893 | symbol_find_noref (const char *name, int noref) |
| 894 | { |
| 895 | symbolS * result; |
| 896 | char * copy = NULL; |
| 897 | |
| 898 | #ifdef tc_canonicalize_symbol_name |
| 899 | { |
| 900 | copy = xstrdup (name); |
| 901 | name = tc_canonicalize_symbol_name (copy); |
| 902 | } |
| 903 | #endif |
| 904 | |
| 905 | if (! symbols_case_sensitive) |
| 906 | { |
| 907 | const char *orig; |
| 908 | char *copy2 = NULL; |
| 909 | unsigned char c; |
| 910 | |
| 911 | orig = name; |
| 912 | if (copy != NULL) |
| 913 | copy2 = copy; |
| 914 | name = copy = XNEWVEC (char, strlen (name) + 1); |
| 915 | |
| 916 | while ((c = *orig++) != '\0') |
| 917 | *copy++ = TOUPPER (c); |
| 918 | *copy = '\0'; |
| 919 | |
| 920 | if (copy2 != NULL) |
| 921 | free (copy2); |
| 922 | copy = (char *) name; |
| 923 | } |
| 924 | |
| 925 | result = symbol_find_exact_noref (name, noref); |
| 926 | if (copy != NULL) |
| 927 | free (copy); |
| 928 | return result; |
| 929 | } |
| 930 | |
| 931 | /* Once upon a time, symbols were kept in a singly linked list. At |
| 932 | least coff needs to be able to rearrange them from time to time, for |
| 933 | which a doubly linked list is much more convenient. Loic did these |
| 934 | as macros which seemed dangerous to me so they're now functions. |
| 935 | xoxorich. */ |
| 936 | |
| 937 | /* Link symbol ADDME after symbol TARGET in the chain. */ |
| 938 | |
| 939 | void |
| 940 | symbol_append (symbolS *addme, symbolS *target, |
| 941 | symbolS **rootPP, symbolS **lastPP) |
| 942 | { |
| 943 | if (LOCAL_SYMBOL_CHECK (addme)) |
| 944 | abort (); |
| 945 | if (target != NULL && LOCAL_SYMBOL_CHECK (target)) |
| 946 | abort (); |
| 947 | |
| 948 | if (target == NULL) |
| 949 | { |
| 950 | know (*rootPP == NULL); |
| 951 | know (*lastPP == NULL); |
| 952 | addme->sy_next = NULL; |
| 953 | addme->sy_previous = NULL; |
| 954 | *rootPP = addme; |
| 955 | *lastPP = addme; |
| 956 | return; |
| 957 | } /* if the list is empty */ |
| 958 | |
| 959 | if (target->sy_next != NULL) |
| 960 | { |
| 961 | target->sy_next->sy_previous = addme; |
| 962 | } |
| 963 | else |
| 964 | { |
| 965 | know (*lastPP == target); |
| 966 | *lastPP = addme; |
| 967 | } /* if we have a next */ |
| 968 | |
| 969 | addme->sy_next = target->sy_next; |
| 970 | target->sy_next = addme; |
| 971 | addme->sy_previous = target; |
| 972 | |
| 973 | debug_verify_symchain (symbol_rootP, symbol_lastP); |
| 974 | } |
| 975 | |
| 976 | /* Set the chain pointers of SYMBOL to null. */ |
| 977 | |
| 978 | void |
| 979 | symbol_clear_list_pointers (symbolS *symbolP) |
| 980 | { |
| 981 | if (LOCAL_SYMBOL_CHECK (symbolP)) |
| 982 | abort (); |
| 983 | symbolP->sy_next = NULL; |
| 984 | symbolP->sy_previous = NULL; |
| 985 | } |
| 986 | |
| 987 | /* Remove SYMBOLP from the list. */ |
| 988 | |
| 989 | void |
| 990 | symbol_remove (symbolS *symbolP, symbolS **rootPP, symbolS **lastPP) |
| 991 | { |
| 992 | if (LOCAL_SYMBOL_CHECK (symbolP)) |
| 993 | abort (); |
| 994 | |
| 995 | if (symbolP == *rootPP) |
| 996 | { |
| 997 | *rootPP = symbolP->sy_next; |
| 998 | } /* if it was the root */ |
| 999 | |
| 1000 | if (symbolP == *lastPP) |
| 1001 | { |
| 1002 | *lastPP = symbolP->sy_previous; |
| 1003 | } /* if it was the tail */ |
| 1004 | |
| 1005 | if (symbolP->sy_next != NULL) |
| 1006 | { |
| 1007 | symbolP->sy_next->sy_previous = symbolP->sy_previous; |
| 1008 | } /* if not last */ |
| 1009 | |
| 1010 | if (symbolP->sy_previous != NULL) |
| 1011 | { |
| 1012 | symbolP->sy_previous->sy_next = symbolP->sy_next; |
| 1013 | } /* if not first */ |
| 1014 | |
| 1015 | debug_verify_symchain (*rootPP, *lastPP); |
| 1016 | } |
| 1017 | |
| 1018 | /* Link symbol ADDME before symbol TARGET in the chain. */ |
| 1019 | |
| 1020 | void |
| 1021 | symbol_insert (symbolS *addme, symbolS *target, |
| 1022 | symbolS **rootPP, symbolS **lastPP ATTRIBUTE_UNUSED) |
| 1023 | { |
| 1024 | if (LOCAL_SYMBOL_CHECK (addme)) |
| 1025 | abort (); |
| 1026 | if (LOCAL_SYMBOL_CHECK (target)) |
| 1027 | abort (); |
| 1028 | |
| 1029 | if (target->sy_previous != NULL) |
| 1030 | { |
| 1031 | target->sy_previous->sy_next = addme; |
| 1032 | } |
| 1033 | else |
| 1034 | { |
| 1035 | know (*rootPP == target); |
| 1036 | *rootPP = addme; |
| 1037 | } /* if not first */ |
| 1038 | |
| 1039 | addme->sy_previous = target->sy_previous; |
| 1040 | target->sy_previous = addme; |
| 1041 | addme->sy_next = target; |
| 1042 | |
| 1043 | debug_verify_symchain (*rootPP, *lastPP); |
| 1044 | } |
| 1045 | |
| 1046 | void |
| 1047 | verify_symbol_chain (symbolS *rootP, symbolS *lastP) |
| 1048 | { |
| 1049 | symbolS *symbolP = rootP; |
| 1050 | |
| 1051 | if (symbolP == NULL) |
| 1052 | return; |
| 1053 | |
| 1054 | for (; symbol_next (symbolP) != NULL; symbolP = symbol_next (symbolP)) |
| 1055 | { |
| 1056 | gas_assert (symbolP->bsym != NULL); |
| 1057 | gas_assert (symbolP->sy_flags.sy_local_symbol == 0); |
| 1058 | gas_assert (symbolP->sy_next->sy_previous == symbolP); |
| 1059 | } |
| 1060 | |
| 1061 | gas_assert (lastP == symbolP); |
| 1062 | } |
| 1063 | |
| 1064 | int |
| 1065 | symbol_on_chain (symbolS *s, symbolS *rootPP, symbolS *lastPP) |
| 1066 | { |
| 1067 | return (!LOCAL_SYMBOL_CHECK (s) |
| 1068 | && ((s->sy_next != s |
| 1069 | && s->sy_next != NULL |
| 1070 | && s->sy_next->sy_previous == s) |
| 1071 | || s == lastPP) |
| 1072 | && ((s->sy_previous != s |
| 1073 | && s->sy_previous != NULL |
| 1074 | && s->sy_previous->sy_next == s) |
| 1075 | || s == rootPP)); |
| 1076 | } |
| 1077 | |
| 1078 | #ifdef OBJ_COMPLEX_RELC |
| 1079 | |
| 1080 | static int |
| 1081 | use_complex_relocs_for (symbolS * symp) |
| 1082 | { |
| 1083 | switch (symp->sy_value.X_op) |
| 1084 | { |
| 1085 | case O_constant: |
| 1086 | return 0; |
| 1087 | |
| 1088 | case O_symbol: |
| 1089 | case O_symbol_rva: |
| 1090 | case O_uminus: |
| 1091 | case O_bit_not: |
| 1092 | case O_logical_not: |
| 1093 | if ( (S_IS_COMMON (symp->sy_value.X_add_symbol) |
| 1094 | || S_IS_LOCAL (symp->sy_value.X_add_symbol)) |
| 1095 | && |
| 1096 | (S_IS_DEFINED (symp->sy_value.X_add_symbol) |
| 1097 | && S_GET_SEGMENT (symp->sy_value.X_add_symbol) != expr_section)) |
| 1098 | return 0; |
| 1099 | break; |
| 1100 | |
| 1101 | case O_multiply: |
| 1102 | case O_divide: |
| 1103 | case O_modulus: |
| 1104 | case O_left_shift: |
| 1105 | case O_right_shift: |
| 1106 | case O_bit_inclusive_or: |
| 1107 | case O_bit_or_not: |
| 1108 | case O_bit_exclusive_or: |
| 1109 | case O_bit_and: |
| 1110 | case O_add: |
| 1111 | case O_subtract: |
| 1112 | case O_eq: |
| 1113 | case O_ne: |
| 1114 | case O_lt: |
| 1115 | case O_le: |
| 1116 | case O_ge: |
| 1117 | case O_gt: |
| 1118 | case O_logical_and: |
| 1119 | case O_logical_or: |
| 1120 | |
| 1121 | if ( (S_IS_COMMON (symp->sy_value.X_add_symbol) |
| 1122 | || S_IS_LOCAL (symp->sy_value.X_add_symbol)) |
| 1123 | && |
| 1124 | (S_IS_COMMON (symp->sy_value.X_op_symbol) |
| 1125 | || S_IS_LOCAL (symp->sy_value.X_op_symbol)) |
| 1126 | |
| 1127 | && S_IS_DEFINED (symp->sy_value.X_add_symbol) |
| 1128 | && S_IS_DEFINED (symp->sy_value.X_op_symbol) |
| 1129 | && S_GET_SEGMENT (symp->sy_value.X_add_symbol) != expr_section |
| 1130 | && S_GET_SEGMENT (symp->sy_value.X_op_symbol) != expr_section) |
| 1131 | return 0; |
| 1132 | break; |
| 1133 | |
| 1134 | default: |
| 1135 | break; |
| 1136 | } |
| 1137 | return 1; |
| 1138 | } |
| 1139 | #endif |
| 1140 | |
| 1141 | static void |
| 1142 | report_op_error (symbolS *symp, symbolS *left, operatorT op, symbolS *right) |
| 1143 | { |
| 1144 | const char *file; |
| 1145 | unsigned int line; |
| 1146 | segT seg_left = left ? S_GET_SEGMENT (left) : 0; |
| 1147 | segT seg_right = S_GET_SEGMENT (right); |
| 1148 | const char *opname; |
| 1149 | |
| 1150 | switch (op) |
| 1151 | { |
| 1152 | default: |
| 1153 | abort (); |
| 1154 | return; |
| 1155 | |
| 1156 | case O_uminus: opname = "-"; break; |
| 1157 | case O_bit_not: opname = "~"; break; |
| 1158 | case O_logical_not: opname = "!"; break; |
| 1159 | case O_multiply: opname = "*"; break; |
| 1160 | case O_divide: opname = "/"; break; |
| 1161 | case O_modulus: opname = "%"; break; |
| 1162 | case O_left_shift: opname = "<<"; break; |
| 1163 | case O_right_shift: opname = ">>"; break; |
| 1164 | case O_bit_inclusive_or: opname = "|"; break; |
| 1165 | case O_bit_or_not: opname = "|~"; break; |
| 1166 | case O_bit_exclusive_or: opname = "^"; break; |
| 1167 | case O_bit_and: opname = "&"; break; |
| 1168 | case O_add: opname = "+"; break; |
| 1169 | case O_subtract: opname = "-"; break; |
| 1170 | case O_eq: opname = "=="; break; |
| 1171 | case O_ne: opname = "!="; break; |
| 1172 | case O_lt: opname = "<"; break; |
| 1173 | case O_le: opname = "<="; break; |
| 1174 | case O_ge: opname = ">="; break; |
| 1175 | case O_gt: opname = ">"; break; |
| 1176 | case O_logical_and: opname = "&&"; break; |
| 1177 | case O_logical_or: opname = "||"; break; |
| 1178 | } |
| 1179 | |
| 1180 | if (expr_symbol_where (symp, &file, &line)) |
| 1181 | { |
| 1182 | if (left) |
| 1183 | as_bad_where (file, line, |
| 1184 | _("invalid operands (%s and %s sections) for `%s'"), |
| 1185 | seg_left->name, seg_right->name, opname); |
| 1186 | else |
| 1187 | as_bad_where (file, line, |
| 1188 | _("invalid operand (%s section) for `%s'"), |
| 1189 | seg_right->name, opname); |
| 1190 | } |
| 1191 | else |
| 1192 | { |
| 1193 | const char *sname = S_GET_NAME (symp); |
| 1194 | |
| 1195 | if (left) |
| 1196 | as_bad (_("invalid operands (%s and %s sections) for `%s' when setting `%s'"), |
| 1197 | seg_left->name, seg_right->name, opname, sname); |
| 1198 | else |
| 1199 | as_bad (_("invalid operand (%s section) for `%s' when setting `%s'"), |
| 1200 | seg_right->name, opname, sname); |
| 1201 | } |
| 1202 | } |
| 1203 | |
| 1204 | /* Resolve the value of a symbol. This is called during the final |
| 1205 | pass over the symbol table to resolve any symbols with complex |
| 1206 | values. */ |
| 1207 | |
| 1208 | valueT |
| 1209 | resolve_symbol_value (symbolS *symp) |
| 1210 | { |
| 1211 | int resolved; |
| 1212 | valueT final_val = 0; |
| 1213 | segT final_seg; |
| 1214 | |
| 1215 | if (LOCAL_SYMBOL_CHECK (symp)) |
| 1216 | { |
| 1217 | struct local_symbol *locsym = (struct local_symbol *) symp; |
| 1218 | |
| 1219 | final_val = locsym->lsy_value; |
| 1220 | if (local_symbol_resolved_p (locsym)) |
| 1221 | return final_val; |
| 1222 | |
| 1223 | final_val += local_symbol_get_frag (locsym)->fr_address / OCTETS_PER_BYTE; |
| 1224 | |
| 1225 | if (finalize_syms) |
| 1226 | { |
| 1227 | locsym->lsy_value = final_val; |
| 1228 | local_symbol_mark_resolved (locsym); |
| 1229 | } |
| 1230 | |
| 1231 | return final_val; |
| 1232 | } |
| 1233 | |
| 1234 | if (symp->sy_flags.sy_resolved) |
| 1235 | { |
| 1236 | if (symp->sy_value.X_op == O_constant) |
| 1237 | return (valueT) symp->sy_value.X_add_number; |
| 1238 | else |
| 1239 | return 0; |
| 1240 | } |
| 1241 | |
| 1242 | resolved = 0; |
| 1243 | final_seg = S_GET_SEGMENT (symp); |
| 1244 | |
| 1245 | if (symp->sy_flags.sy_resolving) |
| 1246 | { |
| 1247 | if (finalize_syms) |
| 1248 | as_bad (_("symbol definition loop encountered at `%s'"), |
| 1249 | S_GET_NAME (symp)); |
| 1250 | final_val = 0; |
| 1251 | resolved = 1; |
| 1252 | } |
| 1253 | #ifdef OBJ_COMPLEX_RELC |
| 1254 | else if (final_seg == expr_section |
| 1255 | && use_complex_relocs_for (symp)) |
| 1256 | { |
| 1257 | symbolS * relc_symbol = NULL; |
| 1258 | char * relc_symbol_name = NULL; |
| 1259 | |
| 1260 | relc_symbol_name = symbol_relc_make_expr (& symp->sy_value); |
| 1261 | |
| 1262 | /* For debugging, print out conversion input & output. */ |
| 1263 | #ifdef DEBUG_SYMS |
| 1264 | print_expr (& symp->sy_value); |
| 1265 | if (relc_symbol_name) |
| 1266 | fprintf (stderr, "-> relc symbol: %s\n", relc_symbol_name); |
| 1267 | #endif |
| 1268 | |
| 1269 | if (relc_symbol_name != NULL) |
| 1270 | relc_symbol = symbol_new (relc_symbol_name, undefined_section, |
| 1271 | 0, & zero_address_frag); |
| 1272 | |
| 1273 | if (relc_symbol == NULL) |
| 1274 | { |
| 1275 | as_bad (_("cannot convert expression symbol %s to complex relocation"), |
| 1276 | S_GET_NAME (symp)); |
| 1277 | resolved = 0; |
| 1278 | } |
| 1279 | else |
| 1280 | { |
| 1281 | symbol_table_insert (relc_symbol); |
| 1282 | |
| 1283 | /* S_CLEAR_EXTERNAL (relc_symbol); */ |
| 1284 | if (symp->bsym->flags & BSF_SRELC) |
| 1285 | relc_symbol->bsym->flags |= BSF_SRELC; |
| 1286 | else |
| 1287 | relc_symbol->bsym->flags |= BSF_RELC; |
| 1288 | /* symp->bsym->flags |= BSF_RELC; */ |
| 1289 | copy_symbol_attributes (symp, relc_symbol); |
| 1290 | symp->sy_value.X_op = O_symbol; |
| 1291 | symp->sy_value.X_add_symbol = relc_symbol; |
| 1292 | symp->sy_value.X_add_number = 0; |
| 1293 | resolved = 1; |
| 1294 | } |
| 1295 | |
| 1296 | final_seg = undefined_section; |
| 1297 | goto exit_dont_set_value; |
| 1298 | } |
| 1299 | #endif |
| 1300 | else |
| 1301 | { |
| 1302 | symbolS *add_symbol, *op_symbol; |
| 1303 | offsetT left, right; |
| 1304 | segT seg_left, seg_right; |
| 1305 | operatorT op; |
| 1306 | int move_seg_ok; |
| 1307 | |
| 1308 | symp->sy_flags.sy_resolving = 1; |
| 1309 | |
| 1310 | /* Help out with CSE. */ |
| 1311 | add_symbol = symp->sy_value.X_add_symbol; |
| 1312 | op_symbol = symp->sy_value.X_op_symbol; |
| 1313 | final_val = symp->sy_value.X_add_number; |
| 1314 | op = symp->sy_value.X_op; |
| 1315 | |
| 1316 | switch (op) |
| 1317 | { |
| 1318 | default: |
| 1319 | BAD_CASE (op); |
| 1320 | break; |
| 1321 | |
| 1322 | case O_absent: |
| 1323 | final_val = 0; |
| 1324 | /* Fall through. */ |
| 1325 | |
| 1326 | case O_constant: |
| 1327 | final_val += symp->sy_frag->fr_address / OCTETS_PER_BYTE; |
| 1328 | if (final_seg == expr_section) |
| 1329 | final_seg = absolute_section; |
| 1330 | /* Fall through. */ |
| 1331 | |
| 1332 | case O_register: |
| 1333 | resolved = 1; |
| 1334 | break; |
| 1335 | |
| 1336 | case O_symbol: |
| 1337 | case O_symbol_rva: |
| 1338 | left = resolve_symbol_value (add_symbol); |
| 1339 | seg_left = S_GET_SEGMENT (add_symbol); |
| 1340 | if (finalize_syms) |
| 1341 | symp->sy_value.X_op_symbol = NULL; |
| 1342 | |
| 1343 | do_symbol: |
| 1344 | if (S_IS_WEAKREFR (symp)) |
| 1345 | { |
| 1346 | gas_assert (final_val == 0); |
| 1347 | if (S_IS_WEAKREFR (add_symbol)) |
| 1348 | { |
| 1349 | gas_assert (add_symbol->sy_value.X_op == O_symbol |
| 1350 | && add_symbol->sy_value.X_add_number == 0); |
| 1351 | add_symbol = add_symbol->sy_value.X_add_symbol; |
| 1352 | gas_assert (! S_IS_WEAKREFR (add_symbol)); |
| 1353 | symp->sy_value.X_add_symbol = add_symbol; |
| 1354 | } |
| 1355 | } |
| 1356 | |
| 1357 | if (symp->sy_flags.sy_mri_common) |
| 1358 | { |
| 1359 | /* This is a symbol inside an MRI common section. The |
| 1360 | relocation routines are going to handle it specially. |
| 1361 | Don't change the value. */ |
| 1362 | resolved = symbol_resolved_p (add_symbol); |
| 1363 | break; |
| 1364 | } |
| 1365 | |
| 1366 | if (finalize_syms && final_val == 0) |
| 1367 | { |
| 1368 | if (LOCAL_SYMBOL_CHECK (add_symbol)) |
| 1369 | add_symbol = local_symbol_convert ((struct local_symbol *) |
| 1370 | add_symbol); |
| 1371 | copy_symbol_attributes (symp, add_symbol); |
| 1372 | } |
| 1373 | |
| 1374 | /* If we have equated this symbol to an undefined or common |
| 1375 | symbol, keep X_op set to O_symbol, and don't change |
| 1376 | X_add_number. This permits the routine which writes out |
| 1377 | relocation to detect this case, and convert the |
| 1378 | relocation to be against the symbol to which this symbol |
| 1379 | is equated. */ |
| 1380 | if (! S_IS_DEFINED (add_symbol) |
| 1381 | #if defined (OBJ_COFF) && defined (TE_PE) |
| 1382 | || S_IS_WEAK (add_symbol) |
| 1383 | #endif |
| 1384 | || S_IS_COMMON (add_symbol)) |
| 1385 | { |
| 1386 | if (finalize_syms) |
| 1387 | { |
| 1388 | symp->sy_value.X_op = O_symbol; |
| 1389 | symp->sy_value.X_add_symbol = add_symbol; |
| 1390 | symp->sy_value.X_add_number = final_val; |
| 1391 | /* Use X_op_symbol as a flag. */ |
| 1392 | symp->sy_value.X_op_symbol = add_symbol; |
| 1393 | } |
| 1394 | final_seg = seg_left; |
| 1395 | final_val = 0; |
| 1396 | resolved = symbol_resolved_p (add_symbol); |
| 1397 | symp->sy_flags.sy_resolving = 0; |
| 1398 | goto exit_dont_set_value; |
| 1399 | } |
| 1400 | else if (finalize_syms |
| 1401 | && ((final_seg == expr_section && seg_left != expr_section) |
| 1402 | || symbol_shadow_p (symp))) |
| 1403 | { |
| 1404 | /* If the symbol is an expression symbol, do similarly |
| 1405 | as for undefined and common syms above. Handles |
| 1406 | "sym +/- expr" where "expr" cannot be evaluated |
| 1407 | immediately, and we want relocations to be against |
| 1408 | "sym", eg. because it is weak. */ |
| 1409 | symp->sy_value.X_op = O_symbol; |
| 1410 | symp->sy_value.X_add_symbol = add_symbol; |
| 1411 | symp->sy_value.X_add_number = final_val; |
| 1412 | symp->sy_value.X_op_symbol = add_symbol; |
| 1413 | final_seg = seg_left; |
| 1414 | final_val += symp->sy_frag->fr_address + left; |
| 1415 | resolved = symbol_resolved_p (add_symbol); |
| 1416 | symp->sy_flags.sy_resolving = 0; |
| 1417 | goto exit_dont_set_value; |
| 1418 | } |
| 1419 | else |
| 1420 | { |
| 1421 | final_val += symp->sy_frag->fr_address + left; |
| 1422 | if (final_seg == expr_section || final_seg == undefined_section) |
| 1423 | final_seg = seg_left; |
| 1424 | } |
| 1425 | |
| 1426 | resolved = symbol_resolved_p (add_symbol); |
| 1427 | if (S_IS_WEAKREFR (symp)) |
| 1428 | { |
| 1429 | symp->sy_flags.sy_resolving = 0; |
| 1430 | goto exit_dont_set_value; |
| 1431 | } |
| 1432 | break; |
| 1433 | |
| 1434 | case O_uminus: |
| 1435 | case O_bit_not: |
| 1436 | case O_logical_not: |
| 1437 | left = resolve_symbol_value (add_symbol); |
| 1438 | seg_left = S_GET_SEGMENT (add_symbol); |
| 1439 | |
| 1440 | /* By reducing these to the relevant dyadic operator, we get |
| 1441 | !S -> S == 0 permitted on anything, |
| 1442 | -S -> 0 - S only permitted on absolute |
| 1443 | ~S -> S ^ ~0 only permitted on absolute */ |
| 1444 | if (op != O_logical_not && seg_left != absolute_section |
| 1445 | && finalize_syms) |
| 1446 | report_op_error (symp, NULL, op, add_symbol); |
| 1447 | |
| 1448 | if (final_seg == expr_section || final_seg == undefined_section) |
| 1449 | final_seg = absolute_section; |
| 1450 | |
| 1451 | if (op == O_uminus) |
| 1452 | left = -left; |
| 1453 | else if (op == O_logical_not) |
| 1454 | left = !left; |
| 1455 | else |
| 1456 | left = ~left; |
| 1457 | |
| 1458 | final_val += left + symp->sy_frag->fr_address; |
| 1459 | |
| 1460 | resolved = symbol_resolved_p (add_symbol); |
| 1461 | break; |
| 1462 | |
| 1463 | case O_multiply: |
| 1464 | case O_divide: |
| 1465 | case O_modulus: |
| 1466 | case O_left_shift: |
| 1467 | case O_right_shift: |
| 1468 | case O_bit_inclusive_or: |
| 1469 | case O_bit_or_not: |
| 1470 | case O_bit_exclusive_or: |
| 1471 | case O_bit_and: |
| 1472 | case O_add: |
| 1473 | case O_subtract: |
| 1474 | case O_eq: |
| 1475 | case O_ne: |
| 1476 | case O_lt: |
| 1477 | case O_le: |
| 1478 | case O_ge: |
| 1479 | case O_gt: |
| 1480 | case O_logical_and: |
| 1481 | case O_logical_or: |
| 1482 | left = resolve_symbol_value (add_symbol); |
| 1483 | right = resolve_symbol_value (op_symbol); |
| 1484 | seg_left = S_GET_SEGMENT (add_symbol); |
| 1485 | seg_right = S_GET_SEGMENT (op_symbol); |
| 1486 | |
| 1487 | /* Simplify addition or subtraction of a constant by folding the |
| 1488 | constant into X_add_number. */ |
| 1489 | if (op == O_add) |
| 1490 | { |
| 1491 | if (seg_right == absolute_section) |
| 1492 | { |
| 1493 | final_val += right; |
| 1494 | goto do_symbol; |
| 1495 | } |
| 1496 | else if (seg_left == absolute_section) |
| 1497 | { |
| 1498 | final_val += left; |
| 1499 | add_symbol = op_symbol; |
| 1500 | left = right; |
| 1501 | seg_left = seg_right; |
| 1502 | goto do_symbol; |
| 1503 | } |
| 1504 | } |
| 1505 | else if (op == O_subtract) |
| 1506 | { |
| 1507 | if (seg_right == absolute_section) |
| 1508 | { |
| 1509 | final_val -= right; |
| 1510 | goto do_symbol; |
| 1511 | } |
| 1512 | } |
| 1513 | |
| 1514 | move_seg_ok = 1; |
| 1515 | /* Equality and non-equality tests are permitted on anything. |
| 1516 | Subtraction, and other comparison operators are permitted if |
| 1517 | both operands are in the same section. Otherwise, both |
| 1518 | operands must be absolute. We already handled the case of |
| 1519 | addition or subtraction of a constant above. This will |
| 1520 | probably need to be changed for an object file format which |
| 1521 | supports arbitrary expressions. */ |
| 1522 | if (!(seg_left == absolute_section |
| 1523 | && seg_right == absolute_section) |
| 1524 | && !(op == O_eq || op == O_ne) |
| 1525 | && !((op == O_subtract |
| 1526 | || op == O_lt || op == O_le || op == O_ge || op == O_gt) |
| 1527 | && seg_left == seg_right |
| 1528 | && (seg_left != undefined_section |
| 1529 | || add_symbol == op_symbol))) |
| 1530 | { |
| 1531 | /* Don't emit messages unless we're finalizing the symbol value, |
| 1532 | otherwise we may get the same message multiple times. */ |
| 1533 | if (finalize_syms) |
| 1534 | report_op_error (symp, add_symbol, op, op_symbol); |
| 1535 | /* However do not move the symbol into the absolute section |
| 1536 | if it cannot currently be resolved - this would confuse |
| 1537 | other parts of the assembler into believing that the |
| 1538 | expression had been evaluated to zero. */ |
| 1539 | else |
| 1540 | move_seg_ok = 0; |
| 1541 | } |
| 1542 | |
| 1543 | if (move_seg_ok |
| 1544 | && (final_seg == expr_section || final_seg == undefined_section)) |
| 1545 | final_seg = absolute_section; |
| 1546 | |
| 1547 | /* Check for division by zero. */ |
| 1548 | if ((op == O_divide || op == O_modulus) && right == 0) |
| 1549 | { |
| 1550 | /* If seg_right is not absolute_section, then we've |
| 1551 | already issued a warning about using a bad symbol. */ |
| 1552 | if (seg_right == absolute_section && finalize_syms) |
| 1553 | { |
| 1554 | const char *file; |
| 1555 | unsigned int line; |
| 1556 | |
| 1557 | if (expr_symbol_where (symp, &file, &line)) |
| 1558 | as_bad_where (file, line, _("division by zero")); |
| 1559 | else |
| 1560 | as_bad (_("division by zero when setting `%s'"), |
| 1561 | S_GET_NAME (symp)); |
| 1562 | } |
| 1563 | |
| 1564 | right = 1; |
| 1565 | } |
| 1566 | |
| 1567 | switch (symp->sy_value.X_op) |
| 1568 | { |
| 1569 | case O_multiply: left *= right; break; |
| 1570 | case O_divide: left /= right; break; |
| 1571 | case O_modulus: left %= right; break; |
| 1572 | case O_left_shift: left <<= right; break; |
| 1573 | case O_right_shift: left >>= right; break; |
| 1574 | case O_bit_inclusive_or: left |= right; break; |
| 1575 | case O_bit_or_not: left |= ~right; break; |
| 1576 | case O_bit_exclusive_or: left ^= right; break; |
| 1577 | case O_bit_and: left &= right; break; |
| 1578 | case O_add: left += right; break; |
| 1579 | case O_subtract: left -= right; break; |
| 1580 | case O_eq: |
| 1581 | case O_ne: |
| 1582 | left = (left == right && seg_left == seg_right |
| 1583 | && (seg_left != undefined_section |
| 1584 | || add_symbol == op_symbol) |
| 1585 | ? ~ (offsetT) 0 : 0); |
| 1586 | if (symp->sy_value.X_op == O_ne) |
| 1587 | left = ~left; |
| 1588 | break; |
| 1589 | case O_lt: left = left < right ? ~ (offsetT) 0 : 0; break; |
| 1590 | case O_le: left = left <= right ? ~ (offsetT) 0 : 0; break; |
| 1591 | case O_ge: left = left >= right ? ~ (offsetT) 0 : 0; break; |
| 1592 | case O_gt: left = left > right ? ~ (offsetT) 0 : 0; break; |
| 1593 | case O_logical_and: left = left && right; break; |
| 1594 | case O_logical_or: left = left || right; break; |
| 1595 | |
| 1596 | case O_illegal: |
| 1597 | case O_absent: |
| 1598 | case O_constant: |
| 1599 | /* See PR 20895 for a reproducer. */ |
| 1600 | as_bad (_("Invalid operation on symbol")); |
| 1601 | goto exit_dont_set_value; |
| 1602 | |
| 1603 | default: |
| 1604 | abort (); |
| 1605 | } |
| 1606 | |
| 1607 | final_val += symp->sy_frag->fr_address + left; |
| 1608 | if (final_seg == expr_section || final_seg == undefined_section) |
| 1609 | { |
| 1610 | if (seg_left == undefined_section |
| 1611 | || seg_right == undefined_section) |
| 1612 | final_seg = undefined_section; |
| 1613 | else if (seg_left == absolute_section) |
| 1614 | final_seg = seg_right; |
| 1615 | else |
| 1616 | final_seg = seg_left; |
| 1617 | } |
| 1618 | resolved = (symbol_resolved_p (add_symbol) |
| 1619 | && symbol_resolved_p (op_symbol)); |
| 1620 | break; |
| 1621 | |
| 1622 | case O_big: |
| 1623 | case O_illegal: |
| 1624 | /* Give an error (below) if not in expr_section. We don't |
| 1625 | want to worry about expr_section symbols, because they |
| 1626 | are fictional (they are created as part of expression |
| 1627 | resolution), and any problems may not actually mean |
| 1628 | anything. */ |
| 1629 | break; |
| 1630 | } |
| 1631 | |
| 1632 | symp->sy_flags.sy_resolving = 0; |
| 1633 | } |
| 1634 | |
| 1635 | if (finalize_syms) |
| 1636 | S_SET_VALUE (symp, final_val); |
| 1637 | |
| 1638 | exit_dont_set_value: |
| 1639 | /* Always set the segment, even if not finalizing the value. |
| 1640 | The segment is used to determine whether a symbol is defined. */ |
| 1641 | S_SET_SEGMENT (symp, final_seg); |
| 1642 | |
| 1643 | /* Don't worry if we can't resolve an expr_section symbol. */ |
| 1644 | if (finalize_syms) |
| 1645 | { |
| 1646 | if (resolved) |
| 1647 | symp->sy_flags.sy_resolved = 1; |
| 1648 | else if (S_GET_SEGMENT (symp) != expr_section) |
| 1649 | { |
| 1650 | as_bad (_("can't resolve value for symbol `%s'"), |
| 1651 | S_GET_NAME (symp)); |
| 1652 | symp->sy_flags.sy_resolved = 1; |
| 1653 | } |
| 1654 | } |
| 1655 | |
| 1656 | return final_val; |
| 1657 | } |
| 1658 | |
| 1659 | static void resolve_local_symbol (const char *, void *); |
| 1660 | |
| 1661 | /* A static function passed to hash_traverse. */ |
| 1662 | |
| 1663 | static void |
| 1664 | resolve_local_symbol (const char *key ATTRIBUTE_UNUSED, void *value) |
| 1665 | { |
| 1666 | if (value != NULL) |
| 1667 | resolve_symbol_value ((symbolS *) value); |
| 1668 | } |
| 1669 | |
| 1670 | /* Resolve all local symbols. */ |
| 1671 | |
| 1672 | void |
| 1673 | resolve_local_symbol_values (void) |
| 1674 | { |
| 1675 | hash_traverse (local_hash, resolve_local_symbol); |
| 1676 | } |
| 1677 | |
| 1678 | /* Obtain the current value of a symbol without changing any |
| 1679 | sub-expressions used. */ |
| 1680 | |
| 1681 | int |
| 1682 | snapshot_symbol (symbolS **symbolPP, valueT *valueP, segT *segP, fragS **fragPP) |
| 1683 | { |
| 1684 | symbolS *symbolP = *symbolPP; |
| 1685 | |
| 1686 | if (LOCAL_SYMBOL_CHECK (symbolP)) |
| 1687 | { |
| 1688 | struct local_symbol *locsym = (struct local_symbol *) symbolP; |
| 1689 | |
| 1690 | *valueP = locsym->lsy_value; |
| 1691 | *segP = locsym->lsy_section; |
| 1692 | *fragPP = local_symbol_get_frag (locsym); |
| 1693 | } |
| 1694 | else |
| 1695 | { |
| 1696 | expressionS exp = symbolP->sy_value; |
| 1697 | |
| 1698 | if (!symbolP->sy_flags.sy_resolved && exp.X_op != O_illegal) |
| 1699 | { |
| 1700 | int resolved; |
| 1701 | |
| 1702 | if (symbolP->sy_flags.sy_resolving) |
| 1703 | return 0; |
| 1704 | symbolP->sy_flags.sy_resolving = 1; |
| 1705 | resolved = resolve_expression (&exp); |
| 1706 | symbolP->sy_flags.sy_resolving = 0; |
| 1707 | if (!resolved) |
| 1708 | return 0; |
| 1709 | |
| 1710 | switch (exp.X_op) |
| 1711 | { |
| 1712 | case O_constant: |
| 1713 | case O_register: |
| 1714 | if (!symbol_equated_p (symbolP)) |
| 1715 | break; |
| 1716 | /* Fallthru. */ |
| 1717 | case O_symbol: |
| 1718 | case O_symbol_rva: |
| 1719 | symbolP = exp.X_add_symbol; |
| 1720 | break; |
| 1721 | default: |
| 1722 | return 0; |
| 1723 | } |
| 1724 | } |
| 1725 | |
| 1726 | *symbolPP = symbolP; |
| 1727 | |
| 1728 | /* A bogus input file can result in resolve_expression() |
| 1729 | generating a local symbol, so we have to check again. */ |
| 1730 | if (LOCAL_SYMBOL_CHECK (symbolP)) |
| 1731 | { |
| 1732 | struct local_symbol *locsym = (struct local_symbol *) symbolP; |
| 1733 | |
| 1734 | *valueP = locsym->lsy_value; |
| 1735 | *segP = locsym->lsy_section; |
| 1736 | *fragPP = local_symbol_get_frag (locsym); |
| 1737 | } |
| 1738 | else |
| 1739 | { |
| 1740 | *valueP = exp.X_add_number; |
| 1741 | *segP = symbolP->bsym->section; |
| 1742 | *fragPP = symbolP->sy_frag; |
| 1743 | } |
| 1744 | |
| 1745 | if (*segP == expr_section) |
| 1746 | switch (exp.X_op) |
| 1747 | { |
| 1748 | case O_constant: *segP = absolute_section; break; |
| 1749 | case O_register: *segP = reg_section; break; |
| 1750 | default: break; |
| 1751 | } |
| 1752 | } |
| 1753 | |
| 1754 | return 1; |
| 1755 | } |
| 1756 | |
| 1757 | /* Dollar labels look like a number followed by a dollar sign. Eg, "42$". |
| 1758 | They are *really* local. That is, they go out of scope whenever we see a |
| 1759 | label that isn't local. Also, like fb labels, there can be multiple |
| 1760 | instances of a dollar label. Therefor, we name encode each instance with |
| 1761 | the instance number, keep a list of defined symbols separate from the real |
| 1762 | symbol table, and we treat these buggers as a sparse array. */ |
| 1763 | |
| 1764 | static long *dollar_labels; |
| 1765 | static long *dollar_label_instances; |
| 1766 | static char *dollar_label_defines; |
| 1767 | static unsigned long dollar_label_count; |
| 1768 | static unsigned long dollar_label_max; |
| 1769 | |
| 1770 | int |
| 1771 | dollar_label_defined (long label) |
| 1772 | { |
| 1773 | long *i; |
| 1774 | |
| 1775 | know ((dollar_labels != NULL) || (dollar_label_count == 0)); |
| 1776 | |
| 1777 | for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i) |
| 1778 | if (*i == label) |
| 1779 | return dollar_label_defines[i - dollar_labels]; |
| 1780 | |
| 1781 | /* If we get here, label isn't defined. */ |
| 1782 | return 0; |
| 1783 | } |
| 1784 | |
| 1785 | static long |
| 1786 | dollar_label_instance (long label) |
| 1787 | { |
| 1788 | long *i; |
| 1789 | |
| 1790 | know ((dollar_labels != NULL) || (dollar_label_count == 0)); |
| 1791 | |
| 1792 | for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i) |
| 1793 | if (*i == label) |
| 1794 | return (dollar_label_instances[i - dollar_labels]); |
| 1795 | |
| 1796 | /* If we get here, we haven't seen the label before. |
| 1797 | Therefore its instance count is zero. */ |
| 1798 | return 0; |
| 1799 | } |
| 1800 | |
| 1801 | void |
| 1802 | dollar_label_clear (void) |
| 1803 | { |
| 1804 | memset (dollar_label_defines, '\0', (unsigned int) dollar_label_count); |
| 1805 | } |
| 1806 | |
| 1807 | #define DOLLAR_LABEL_BUMP_BY 10 |
| 1808 | |
| 1809 | void |
| 1810 | define_dollar_label (long label) |
| 1811 | { |
| 1812 | long *i; |
| 1813 | |
| 1814 | for (i = dollar_labels; i < dollar_labels + dollar_label_count; ++i) |
| 1815 | if (*i == label) |
| 1816 | { |
| 1817 | ++dollar_label_instances[i - dollar_labels]; |
| 1818 | dollar_label_defines[i - dollar_labels] = 1; |
| 1819 | return; |
| 1820 | } |
| 1821 | |
| 1822 | /* If we get to here, we don't have label listed yet. */ |
| 1823 | |
| 1824 | if (dollar_labels == NULL) |
| 1825 | { |
| 1826 | dollar_labels = XNEWVEC (long, DOLLAR_LABEL_BUMP_BY); |
| 1827 | dollar_label_instances = XNEWVEC (long, DOLLAR_LABEL_BUMP_BY); |
| 1828 | dollar_label_defines = XNEWVEC (char, DOLLAR_LABEL_BUMP_BY); |
| 1829 | dollar_label_max = DOLLAR_LABEL_BUMP_BY; |
| 1830 | dollar_label_count = 0; |
| 1831 | } |
| 1832 | else if (dollar_label_count == dollar_label_max) |
| 1833 | { |
| 1834 | dollar_label_max += DOLLAR_LABEL_BUMP_BY; |
| 1835 | dollar_labels = XRESIZEVEC (long, dollar_labels, dollar_label_max); |
| 1836 | dollar_label_instances = XRESIZEVEC (long, dollar_label_instances, |
| 1837 | dollar_label_max); |
| 1838 | dollar_label_defines = XRESIZEVEC (char, dollar_label_defines, |
| 1839 | dollar_label_max); |
| 1840 | } /* if we needed to grow */ |
| 1841 | |
| 1842 | dollar_labels[dollar_label_count] = label; |
| 1843 | dollar_label_instances[dollar_label_count] = 1; |
| 1844 | dollar_label_defines[dollar_label_count] = 1; |
| 1845 | ++dollar_label_count; |
| 1846 | } |
| 1847 | |
| 1848 | /* Caller must copy returned name: we re-use the area for the next name. |
| 1849 | |
| 1850 | The mth occurrence of label n: is turned into the symbol "Ln^Am" |
| 1851 | where n is the label number and m is the instance number. "L" makes |
| 1852 | it a label discarded unless debugging and "^A"('\1') ensures no |
| 1853 | ordinary symbol SHOULD get the same name as a local label |
| 1854 | symbol. The first "4:" is "L4^A1" - the m numbers begin at 1. |
| 1855 | |
| 1856 | fb labels get the same treatment, except that ^B is used in place |
| 1857 | of ^A. */ |
| 1858 | |
| 1859 | char * /* Return local label name. */ |
| 1860 | dollar_label_name (long n, /* we just saw "n$:" : n a number. */ |
| 1861 | int augend /* 0 for current instance, 1 for new instance. */) |
| 1862 | { |
| 1863 | long i; |
| 1864 | /* Returned to caller, then copied. Used for created names ("4f"). */ |
| 1865 | static char symbol_name_build[24]; |
| 1866 | char *p; |
| 1867 | char *q; |
| 1868 | char symbol_name_temporary[20]; /* Build up a number, BACKWARDS. */ |
| 1869 | |
| 1870 | know (n >= 0); |
| 1871 | know (augend == 0 || augend == 1); |
| 1872 | p = symbol_name_build; |
| 1873 | #ifdef LOCAL_LABEL_PREFIX |
| 1874 | *p++ = LOCAL_LABEL_PREFIX; |
| 1875 | #endif |
| 1876 | *p++ = 'L'; |
| 1877 | |
| 1878 | /* Next code just does sprintf( {}, "%d", n); */ |
| 1879 | /* Label number. */ |
| 1880 | q = symbol_name_temporary; |
| 1881 | for (*q++ = 0, i = n; i; ++q) |
| 1882 | { |
| 1883 | *q = i % 10 + '0'; |
| 1884 | i /= 10; |
| 1885 | } |
| 1886 | while ((*p = *--q) != '\0') |
| 1887 | ++p; |
| 1888 | |
| 1889 | *p++ = DOLLAR_LABEL_CHAR; /* ^A */ |
| 1890 | |
| 1891 | /* Instance number. */ |
| 1892 | q = symbol_name_temporary; |
| 1893 | for (*q++ = 0, i = dollar_label_instance (n) + augend; i; ++q) |
| 1894 | { |
| 1895 | *q = i % 10 + '0'; |
| 1896 | i /= 10; |
| 1897 | } |
| 1898 | while ((*p++ = *--q) != '\0'); |
| 1899 | |
| 1900 | /* The label, as a '\0' ended string, starts at symbol_name_build. */ |
| 1901 | return symbol_name_build; |
| 1902 | } |
| 1903 | |
| 1904 | /* Somebody else's idea of local labels. They are made by "n:" where n |
| 1905 | is any decimal digit. Refer to them with |
| 1906 | "nb" for previous (backward) n: |
| 1907 | or "nf" for next (forward) n:. |
| 1908 | |
| 1909 | We do a little better and let n be any number, not just a single digit, but |
| 1910 | since the other guy's assembler only does ten, we treat the first ten |
| 1911 | specially. |
| 1912 | |
| 1913 | Like someone else's assembler, we have one set of local label counters for |
| 1914 | entire assembly, not one set per (sub)segment like in most assemblers. This |
| 1915 | implies that one can refer to a label in another segment, and indeed some |
| 1916 | crufty compilers have done just that. |
| 1917 | |
| 1918 | Since there could be a LOT of these things, treat them as a sparse |
| 1919 | array. */ |
| 1920 | |
| 1921 | #define FB_LABEL_SPECIAL (10) |
| 1922 | |
| 1923 | static long fb_low_counter[FB_LABEL_SPECIAL]; |
| 1924 | static long *fb_labels; |
| 1925 | static long *fb_label_instances; |
| 1926 | static long fb_label_count; |
| 1927 | static long fb_label_max; |
| 1928 | |
| 1929 | /* This must be more than FB_LABEL_SPECIAL. */ |
| 1930 | #define FB_LABEL_BUMP_BY (FB_LABEL_SPECIAL + 6) |
| 1931 | |
| 1932 | static void |
| 1933 | fb_label_init (void) |
| 1934 | { |
| 1935 | memset ((void *) fb_low_counter, '\0', sizeof (fb_low_counter)); |
| 1936 | } |
| 1937 | |
| 1938 | /* Add one to the instance number of this fb label. */ |
| 1939 | |
| 1940 | void |
| 1941 | fb_label_instance_inc (long label) |
| 1942 | { |
| 1943 | long *i; |
| 1944 | |
| 1945 | if ((unsigned long) label < FB_LABEL_SPECIAL) |
| 1946 | { |
| 1947 | ++fb_low_counter[label]; |
| 1948 | return; |
| 1949 | } |
| 1950 | |
| 1951 | if (fb_labels != NULL) |
| 1952 | { |
| 1953 | for (i = fb_labels + FB_LABEL_SPECIAL; |
| 1954 | i < fb_labels + fb_label_count; ++i) |
| 1955 | { |
| 1956 | if (*i == label) |
| 1957 | { |
| 1958 | ++fb_label_instances[i - fb_labels]; |
| 1959 | return; |
| 1960 | } /* if we find it */ |
| 1961 | } /* for each existing label */ |
| 1962 | } |
| 1963 | |
| 1964 | /* If we get to here, we don't have label listed yet. */ |
| 1965 | |
| 1966 | if (fb_labels == NULL) |
| 1967 | { |
| 1968 | fb_labels = XNEWVEC (long, FB_LABEL_BUMP_BY); |
| 1969 | fb_label_instances = XNEWVEC (long, FB_LABEL_BUMP_BY); |
| 1970 | fb_label_max = FB_LABEL_BUMP_BY; |
| 1971 | fb_label_count = FB_LABEL_SPECIAL; |
| 1972 | |
| 1973 | } |
| 1974 | else if (fb_label_count == fb_label_max) |
| 1975 | { |
| 1976 | fb_label_max += FB_LABEL_BUMP_BY; |
| 1977 | fb_labels = XRESIZEVEC (long, fb_labels, fb_label_max); |
| 1978 | fb_label_instances = XRESIZEVEC (long, fb_label_instances, fb_label_max); |
| 1979 | } /* if we needed to grow */ |
| 1980 | |
| 1981 | fb_labels[fb_label_count] = label; |
| 1982 | fb_label_instances[fb_label_count] = 1; |
| 1983 | ++fb_label_count; |
| 1984 | } |
| 1985 | |
| 1986 | static long |
| 1987 | fb_label_instance (long label) |
| 1988 | { |
| 1989 | long *i; |
| 1990 | |
| 1991 | if ((unsigned long) label < FB_LABEL_SPECIAL) |
| 1992 | { |
| 1993 | return (fb_low_counter[label]); |
| 1994 | } |
| 1995 | |
| 1996 | if (fb_labels != NULL) |
| 1997 | { |
| 1998 | for (i = fb_labels + FB_LABEL_SPECIAL; |
| 1999 | i < fb_labels + fb_label_count; ++i) |
| 2000 | { |
| 2001 | if (*i == label) |
| 2002 | { |
| 2003 | return (fb_label_instances[i - fb_labels]); |
| 2004 | } /* if we find it */ |
| 2005 | } /* for each existing label */ |
| 2006 | } |
| 2007 | |
| 2008 | /* We didn't find the label, so this must be a reference to the |
| 2009 | first instance. */ |
| 2010 | return 0; |
| 2011 | } |
| 2012 | |
| 2013 | /* Caller must copy returned name: we re-use the area for the next name. |
| 2014 | |
| 2015 | The mth occurrence of label n: is turned into the symbol "Ln^Bm" |
| 2016 | where n is the label number and m is the instance number. "L" makes |
| 2017 | it a label discarded unless debugging and "^B"('\2') ensures no |
| 2018 | ordinary symbol SHOULD get the same name as a local label |
| 2019 | symbol. The first "4:" is "L4^B1" - the m numbers begin at 1. |
| 2020 | |
| 2021 | dollar labels get the same treatment, except that ^A is used in |
| 2022 | place of ^B. */ |
| 2023 | |
| 2024 | char * /* Return local label name. */ |
| 2025 | fb_label_name (long n, /* We just saw "n:", "nf" or "nb" : n a number. */ |
| 2026 | long augend /* 0 for nb, 1 for n:, nf. */) |
| 2027 | { |
| 2028 | long i; |
| 2029 | /* Returned to caller, then copied. Used for created names ("4f"). */ |
| 2030 | static char symbol_name_build[24]; |
| 2031 | char *p; |
| 2032 | char *q; |
| 2033 | char symbol_name_temporary[20]; /* Build up a number, BACKWARDS. */ |
| 2034 | |
| 2035 | know (n >= 0); |
| 2036 | #ifdef TC_MMIX |
| 2037 | know ((unsigned long) augend <= 2 /* See mmix_fb_label. */); |
| 2038 | #else |
| 2039 | know ((unsigned long) augend <= 1); |
| 2040 | #endif |
| 2041 | p = symbol_name_build; |
| 2042 | #ifdef LOCAL_LABEL_PREFIX |
| 2043 | *p++ = LOCAL_LABEL_PREFIX; |
| 2044 | #endif |
| 2045 | *p++ = 'L'; |
| 2046 | |
| 2047 | /* Next code just does sprintf( {}, "%d", n); */ |
| 2048 | /* Label number. */ |
| 2049 | q = symbol_name_temporary; |
| 2050 | for (*q++ = 0, i = n; i; ++q) |
| 2051 | { |
| 2052 | *q = i % 10 + '0'; |
| 2053 | i /= 10; |
| 2054 | } |
| 2055 | while ((*p = *--q) != '\0') |
| 2056 | ++p; |
| 2057 | |
| 2058 | *p++ = LOCAL_LABEL_CHAR; /* ^B */ |
| 2059 | |
| 2060 | /* Instance number. */ |
| 2061 | q = symbol_name_temporary; |
| 2062 | for (*q++ = 0, i = fb_label_instance (n) + augend; i; ++q) |
| 2063 | { |
| 2064 | *q = i % 10 + '0'; |
| 2065 | i /= 10; |
| 2066 | } |
| 2067 | while ((*p++ = *--q) != '\0'); |
| 2068 | |
| 2069 | /* The label, as a '\0' ended string, starts at symbol_name_build. */ |
| 2070 | return (symbol_name_build); |
| 2071 | } |
| 2072 | |
| 2073 | /* Decode name that may have been generated by foo_label_name() above. |
| 2074 | If the name wasn't generated by foo_label_name(), then return it |
| 2075 | unaltered. This is used for error messages. */ |
| 2076 | |
| 2077 | char * |
| 2078 | decode_local_label_name (char *s) |
| 2079 | { |
| 2080 | char *p; |
| 2081 | char *symbol_decode; |
| 2082 | int label_number; |
| 2083 | int instance_number; |
| 2084 | const char *type; |
| 2085 | const char *message_format; |
| 2086 | int lindex = 0; |
| 2087 | |
| 2088 | #ifdef LOCAL_LABEL_PREFIX |
| 2089 | if (s[lindex] == LOCAL_LABEL_PREFIX) |
| 2090 | ++lindex; |
| 2091 | #endif |
| 2092 | |
| 2093 | if (s[lindex] != 'L') |
| 2094 | return s; |
| 2095 | |
| 2096 | for (label_number = 0, p = s + lindex + 1; ISDIGIT (*p); ++p) |
| 2097 | label_number = (10 * label_number) + *p - '0'; |
| 2098 | |
| 2099 | if (*p == DOLLAR_LABEL_CHAR) |
| 2100 | type = "dollar"; |
| 2101 | else if (*p == LOCAL_LABEL_CHAR) |
| 2102 | type = "fb"; |
| 2103 | else |
| 2104 | return s; |
| 2105 | |
| 2106 | for (instance_number = 0, p++; ISDIGIT (*p); ++p) |
| 2107 | instance_number = (10 * instance_number) + *p - '0'; |
| 2108 | |
| 2109 | message_format = _("\"%d\" (instance number %d of a %s label)"); |
| 2110 | symbol_decode = (char *) obstack_alloc (¬es, strlen (message_format) + 30); |
| 2111 | sprintf (symbol_decode, message_format, label_number, instance_number, type); |
| 2112 | |
| 2113 | return symbol_decode; |
| 2114 | } |
| 2115 | |
| 2116 | /* Get the value of a symbol. */ |
| 2117 | |
| 2118 | valueT |
| 2119 | S_GET_VALUE (symbolS *s) |
| 2120 | { |
| 2121 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2122 | return resolve_symbol_value (s); |
| 2123 | |
| 2124 | if (!s->sy_flags.sy_resolved) |
| 2125 | { |
| 2126 | valueT val = resolve_symbol_value (s); |
| 2127 | if (!finalize_syms) |
| 2128 | return val; |
| 2129 | } |
| 2130 | if (S_IS_WEAKREFR (s)) |
| 2131 | return S_GET_VALUE (s->sy_value.X_add_symbol); |
| 2132 | |
| 2133 | if (s->sy_value.X_op != O_constant) |
| 2134 | { |
| 2135 | if (! s->sy_flags.sy_resolved |
| 2136 | || s->sy_value.X_op != O_symbol |
| 2137 | || (S_IS_DEFINED (s) && ! S_IS_COMMON (s))) |
| 2138 | as_bad (_("attempt to get value of unresolved symbol `%s'"), |
| 2139 | S_GET_NAME (s)); |
| 2140 | } |
| 2141 | return (valueT) s->sy_value.X_add_number; |
| 2142 | } |
| 2143 | |
| 2144 | /* Set the value of a symbol. */ |
| 2145 | |
| 2146 | void |
| 2147 | S_SET_VALUE (symbolS *s, valueT val) |
| 2148 | { |
| 2149 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2150 | { |
| 2151 | ((struct local_symbol *) s)->lsy_value = val; |
| 2152 | return; |
| 2153 | } |
| 2154 | |
| 2155 | s->sy_value.X_op = O_constant; |
| 2156 | s->sy_value.X_add_number = (offsetT) val; |
| 2157 | s->sy_value.X_unsigned = 0; |
| 2158 | S_CLEAR_WEAKREFR (s); |
| 2159 | } |
| 2160 | |
| 2161 | void |
| 2162 | copy_symbol_attributes (symbolS *dest, symbolS *src) |
| 2163 | { |
| 2164 | if (LOCAL_SYMBOL_CHECK (dest)) |
| 2165 | dest = local_symbol_convert ((struct local_symbol *) dest); |
| 2166 | if (LOCAL_SYMBOL_CHECK (src)) |
| 2167 | src = local_symbol_convert ((struct local_symbol *) src); |
| 2168 | |
| 2169 | /* In an expression, transfer the settings of these flags. |
| 2170 | The user can override later, of course. */ |
| 2171 | #define COPIED_SYMFLAGS (BSF_FUNCTION | BSF_OBJECT \ |
| 2172 | | BSF_GNU_INDIRECT_FUNCTION) |
| 2173 | dest->bsym->flags |= src->bsym->flags & COPIED_SYMFLAGS; |
| 2174 | |
| 2175 | #ifdef OBJ_COPY_SYMBOL_ATTRIBUTES |
| 2176 | OBJ_COPY_SYMBOL_ATTRIBUTES (dest, src); |
| 2177 | #endif |
| 2178 | |
| 2179 | #ifdef TC_COPY_SYMBOL_ATTRIBUTES |
| 2180 | TC_COPY_SYMBOL_ATTRIBUTES (dest, src); |
| 2181 | #endif |
| 2182 | } |
| 2183 | |
| 2184 | int |
| 2185 | S_IS_FUNCTION (symbolS *s) |
| 2186 | { |
| 2187 | flagword flags; |
| 2188 | |
| 2189 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2190 | return 0; |
| 2191 | |
| 2192 | flags = s->bsym->flags; |
| 2193 | |
| 2194 | return (flags & BSF_FUNCTION) != 0; |
| 2195 | } |
| 2196 | |
| 2197 | int |
| 2198 | S_IS_EXTERNAL (symbolS *s) |
| 2199 | { |
| 2200 | flagword flags; |
| 2201 | |
| 2202 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2203 | return 0; |
| 2204 | |
| 2205 | flags = s->bsym->flags; |
| 2206 | |
| 2207 | /* Sanity check. */ |
| 2208 | if ((flags & BSF_LOCAL) && (flags & BSF_GLOBAL)) |
| 2209 | abort (); |
| 2210 | |
| 2211 | return (flags & BSF_GLOBAL) != 0; |
| 2212 | } |
| 2213 | |
| 2214 | int |
| 2215 | S_IS_WEAK (symbolS *s) |
| 2216 | { |
| 2217 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2218 | return 0; |
| 2219 | /* Conceptually, a weakrefr is weak if the referenced symbol is. We |
| 2220 | could probably handle a WEAKREFR as always weak though. E.g., if |
| 2221 | the referenced symbol has lost its weak status, there's no reason |
| 2222 | to keep handling the weakrefr as if it was weak. */ |
| 2223 | if (S_IS_WEAKREFR (s)) |
| 2224 | return S_IS_WEAK (s->sy_value.X_add_symbol); |
| 2225 | return (s->bsym->flags & BSF_WEAK) != 0; |
| 2226 | } |
| 2227 | |
| 2228 | int |
| 2229 | S_IS_WEAKREFR (symbolS *s) |
| 2230 | { |
| 2231 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2232 | return 0; |
| 2233 | return s->sy_flags.sy_weakrefr != 0; |
| 2234 | } |
| 2235 | |
| 2236 | int |
| 2237 | S_IS_WEAKREFD (symbolS *s) |
| 2238 | { |
| 2239 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2240 | return 0; |
| 2241 | return s->sy_flags.sy_weakrefd != 0; |
| 2242 | } |
| 2243 | |
| 2244 | int |
| 2245 | S_IS_COMMON (symbolS *s) |
| 2246 | { |
| 2247 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2248 | return 0; |
| 2249 | return bfd_is_com_section (s->bsym->section); |
| 2250 | } |
| 2251 | |
| 2252 | int |
| 2253 | S_IS_DEFINED (symbolS *s) |
| 2254 | { |
| 2255 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2256 | return ((struct local_symbol *) s)->lsy_section != undefined_section; |
| 2257 | return s->bsym->section != undefined_section; |
| 2258 | } |
| 2259 | |
| 2260 | |
| 2261 | #ifndef EXTERN_FORCE_RELOC |
| 2262 | #define EXTERN_FORCE_RELOC IS_ELF |
| 2263 | #endif |
| 2264 | |
| 2265 | /* Return true for symbols that should not be reduced to section |
| 2266 | symbols or eliminated from expressions, because they may be |
| 2267 | overridden by the linker. */ |
| 2268 | int |
| 2269 | S_FORCE_RELOC (symbolS *s, int strict) |
| 2270 | { |
| 2271 | segT sec; |
| 2272 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2273 | sec = ((struct local_symbol *) s)->lsy_section; |
| 2274 | else |
| 2275 | { |
| 2276 | if ((strict |
| 2277 | && ((s->bsym->flags & BSF_WEAK) != 0 |
| 2278 | || (EXTERN_FORCE_RELOC |
| 2279 | && (s->bsym->flags & BSF_GLOBAL) != 0))) |
| 2280 | || (s->bsym->flags & BSF_GNU_INDIRECT_FUNCTION) != 0) |
| 2281 | return TRUE; |
| 2282 | sec = s->bsym->section; |
| 2283 | } |
| 2284 | return bfd_is_und_section (sec) || bfd_is_com_section (sec); |
| 2285 | } |
| 2286 | |
| 2287 | int |
| 2288 | S_IS_DEBUG (symbolS *s) |
| 2289 | { |
| 2290 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2291 | return 0; |
| 2292 | if (s->bsym->flags & BSF_DEBUGGING) |
| 2293 | return 1; |
| 2294 | return 0; |
| 2295 | } |
| 2296 | |
| 2297 | int |
| 2298 | S_IS_LOCAL (symbolS *s) |
| 2299 | { |
| 2300 | flagword flags; |
| 2301 | const char *name; |
| 2302 | |
| 2303 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2304 | return 1; |
| 2305 | |
| 2306 | flags = s->bsym->flags; |
| 2307 | |
| 2308 | /* Sanity check. */ |
| 2309 | if ((flags & BSF_LOCAL) && (flags & BSF_GLOBAL)) |
| 2310 | abort (); |
| 2311 | |
| 2312 | if (bfd_get_section (s->bsym) == reg_section) |
| 2313 | return 1; |
| 2314 | |
| 2315 | if (flag_strip_local_absolute |
| 2316 | /* Keep BSF_FILE symbols in order to allow debuggers to identify |
| 2317 | the source file even when the object file is stripped. */ |
| 2318 | && (flags & (BSF_GLOBAL | BSF_FILE)) == 0 |
| 2319 | && bfd_get_section (s->bsym) == absolute_section) |
| 2320 | return 1; |
| 2321 | |
| 2322 | name = S_GET_NAME (s); |
| 2323 | return (name != NULL |
| 2324 | && ! S_IS_DEBUG (s) |
| 2325 | && (strchr (name, DOLLAR_LABEL_CHAR) |
| 2326 | || strchr (name, LOCAL_LABEL_CHAR) |
| 2327 | #if FAKE_LABEL_CHAR != DOLLAR_LABEL_CHAR |
| 2328 | || strchr (name, FAKE_LABEL_CHAR) |
| 2329 | #endif |
| 2330 | || TC_LABEL_IS_LOCAL (name) |
| 2331 | || (! flag_keep_locals |
| 2332 | && (bfd_is_local_label (stdoutput, s->bsym) |
| 2333 | || (flag_mri |
| 2334 | && name[0] == '?' |
| 2335 | && name[1] == '?'))))); |
| 2336 | } |
| 2337 | |
| 2338 | int |
| 2339 | S_IS_STABD (symbolS *s) |
| 2340 | { |
| 2341 | return S_GET_NAME (s) == 0; |
| 2342 | } |
| 2343 | |
| 2344 | int |
| 2345 | S_CAN_BE_REDEFINED (const symbolS *s) |
| 2346 | { |
| 2347 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2348 | return (local_symbol_get_frag ((struct local_symbol *) s) |
| 2349 | == &predefined_address_frag); |
| 2350 | /* Permit register names to be redefined. */ |
| 2351 | return s->bsym->section == reg_section; |
| 2352 | } |
| 2353 | |
| 2354 | int |
| 2355 | S_IS_VOLATILE (const symbolS *s) |
| 2356 | { |
| 2357 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2358 | return 0; |
| 2359 | return s->sy_flags.sy_volatile; |
| 2360 | } |
| 2361 | |
| 2362 | int |
| 2363 | S_IS_FORWARD_REF (const symbolS *s) |
| 2364 | { |
| 2365 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2366 | return 0; |
| 2367 | return s->sy_flags.sy_forward_ref; |
| 2368 | } |
| 2369 | |
| 2370 | const char * |
| 2371 | S_GET_NAME (symbolS *s) |
| 2372 | { |
| 2373 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2374 | return ((struct local_symbol *) s)->lsy_name; |
| 2375 | return s->bsym->name; |
| 2376 | } |
| 2377 | |
| 2378 | segT |
| 2379 | S_GET_SEGMENT (symbolS *s) |
| 2380 | { |
| 2381 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2382 | return ((struct local_symbol *) s)->lsy_section; |
| 2383 | return s->bsym->section; |
| 2384 | } |
| 2385 | |
| 2386 | void |
| 2387 | S_SET_SEGMENT (symbolS *s, segT seg) |
| 2388 | { |
| 2389 | /* Don't reassign section symbols. The direct reason is to prevent seg |
| 2390 | faults assigning back to const global symbols such as *ABS*, but it |
| 2391 | shouldn't happen anyway. */ |
| 2392 | |
| 2393 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2394 | { |
| 2395 | if (seg == reg_section) |
| 2396 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2397 | else |
| 2398 | { |
| 2399 | ((struct local_symbol *) s)->lsy_section = seg; |
| 2400 | return; |
| 2401 | } |
| 2402 | } |
| 2403 | |
| 2404 | if (s->bsym->flags & BSF_SECTION_SYM) |
| 2405 | { |
| 2406 | if (s->bsym->section != seg) |
| 2407 | abort (); |
| 2408 | } |
| 2409 | else |
| 2410 | s->bsym->section = seg; |
| 2411 | } |
| 2412 | |
| 2413 | void |
| 2414 | S_SET_EXTERNAL (symbolS *s) |
| 2415 | { |
| 2416 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2417 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2418 | if ((s->bsym->flags & BSF_WEAK) != 0) |
| 2419 | { |
| 2420 | /* Let .weak override .global. */ |
| 2421 | return; |
| 2422 | } |
| 2423 | if (s->bsym->flags & BSF_SECTION_SYM) |
| 2424 | { |
| 2425 | /* Do not reassign section symbols. */ |
| 2426 | as_warn (_("section symbols are already global")); |
| 2427 | return; |
| 2428 | } |
| 2429 | #ifndef TC_GLOBAL_REGISTER_SYMBOL_OK |
| 2430 | if (S_GET_SEGMENT (s) == reg_section) |
| 2431 | { |
| 2432 | as_bad ("can't make register symbol `%s' global", |
| 2433 | S_GET_NAME (s)); |
| 2434 | return; |
| 2435 | } |
| 2436 | #endif |
| 2437 | s->bsym->flags |= BSF_GLOBAL; |
| 2438 | s->bsym->flags &= ~(BSF_LOCAL | BSF_WEAK); |
| 2439 | |
| 2440 | #ifdef TE_PE |
| 2441 | if (! an_external_name && S_GET_NAME(s)[0] != '.') |
| 2442 | an_external_name = S_GET_NAME (s); |
| 2443 | #endif |
| 2444 | } |
| 2445 | |
| 2446 | void |
| 2447 | S_CLEAR_EXTERNAL (symbolS *s) |
| 2448 | { |
| 2449 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2450 | return; |
| 2451 | if ((s->bsym->flags & BSF_WEAK) != 0) |
| 2452 | { |
| 2453 | /* Let .weak override. */ |
| 2454 | return; |
| 2455 | } |
| 2456 | s->bsym->flags |= BSF_LOCAL; |
| 2457 | s->bsym->flags &= ~(BSF_GLOBAL | BSF_WEAK); |
| 2458 | } |
| 2459 | |
| 2460 | void |
| 2461 | S_SET_WEAK (symbolS *s) |
| 2462 | { |
| 2463 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2464 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2465 | #ifdef obj_set_weak_hook |
| 2466 | obj_set_weak_hook (s); |
| 2467 | #endif |
| 2468 | s->bsym->flags |= BSF_WEAK; |
| 2469 | s->bsym->flags &= ~(BSF_GLOBAL | BSF_LOCAL); |
| 2470 | } |
| 2471 | |
| 2472 | void |
| 2473 | S_SET_WEAKREFR (symbolS *s) |
| 2474 | { |
| 2475 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2476 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2477 | s->sy_flags.sy_weakrefr = 1; |
| 2478 | /* If the alias was already used, make sure we mark the target as |
| 2479 | used as well, otherwise it might be dropped from the symbol |
| 2480 | table. This may have unintended side effects if the alias is |
| 2481 | later redirected to another symbol, such as keeping the unused |
| 2482 | previous target in the symbol table. Since it will be weak, it's |
| 2483 | not a big deal. */ |
| 2484 | if (s->sy_flags.sy_used) |
| 2485 | symbol_mark_used (s->sy_value.X_add_symbol); |
| 2486 | } |
| 2487 | |
| 2488 | void |
| 2489 | S_CLEAR_WEAKREFR (symbolS *s) |
| 2490 | { |
| 2491 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2492 | return; |
| 2493 | s->sy_flags.sy_weakrefr = 0; |
| 2494 | } |
| 2495 | |
| 2496 | void |
| 2497 | S_SET_WEAKREFD (symbolS *s) |
| 2498 | { |
| 2499 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2500 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2501 | s->sy_flags.sy_weakrefd = 1; |
| 2502 | S_SET_WEAK (s); |
| 2503 | } |
| 2504 | |
| 2505 | void |
| 2506 | S_CLEAR_WEAKREFD (symbolS *s) |
| 2507 | { |
| 2508 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2509 | return; |
| 2510 | if (s->sy_flags.sy_weakrefd) |
| 2511 | { |
| 2512 | s->sy_flags.sy_weakrefd = 0; |
| 2513 | /* If a weakref target symbol is weak, then it was never |
| 2514 | referenced directly before, not even in a .global directive, |
| 2515 | so decay it to local. If it remains undefined, it will be |
| 2516 | later turned into a global, like any other undefined |
| 2517 | symbol. */ |
| 2518 | if (s->bsym->flags & BSF_WEAK) |
| 2519 | { |
| 2520 | #ifdef obj_clear_weak_hook |
| 2521 | obj_clear_weak_hook (s); |
| 2522 | #endif |
| 2523 | s->bsym->flags &= ~BSF_WEAK; |
| 2524 | s->bsym->flags |= BSF_LOCAL; |
| 2525 | } |
| 2526 | } |
| 2527 | } |
| 2528 | |
| 2529 | void |
| 2530 | S_SET_THREAD_LOCAL (symbolS *s) |
| 2531 | { |
| 2532 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2533 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2534 | if (bfd_is_com_section (s->bsym->section) |
| 2535 | && (s->bsym->flags & BSF_THREAD_LOCAL) != 0) |
| 2536 | return; |
| 2537 | s->bsym->flags |= BSF_THREAD_LOCAL; |
| 2538 | if ((s->bsym->flags & BSF_FUNCTION) != 0) |
| 2539 | as_bad (_("Accessing function `%s' as thread-local object"), |
| 2540 | S_GET_NAME (s)); |
| 2541 | else if (! bfd_is_und_section (s->bsym->section) |
| 2542 | && (s->bsym->section->flags & SEC_THREAD_LOCAL) == 0) |
| 2543 | as_bad (_("Accessing `%s' as thread-local object"), |
| 2544 | S_GET_NAME (s)); |
| 2545 | } |
| 2546 | |
| 2547 | void |
| 2548 | S_SET_NAME (symbolS *s, const char *name) |
| 2549 | { |
| 2550 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2551 | { |
| 2552 | ((struct local_symbol *) s)->lsy_name = name; |
| 2553 | return; |
| 2554 | } |
| 2555 | s->bsym->name = name; |
| 2556 | } |
| 2557 | |
| 2558 | void |
| 2559 | S_SET_VOLATILE (symbolS *s) |
| 2560 | { |
| 2561 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2562 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2563 | s->sy_flags.sy_volatile = 1; |
| 2564 | } |
| 2565 | |
| 2566 | void |
| 2567 | S_CLEAR_VOLATILE (symbolS *s) |
| 2568 | { |
| 2569 | if (!LOCAL_SYMBOL_CHECK (s)) |
| 2570 | s->sy_flags.sy_volatile = 0; |
| 2571 | } |
| 2572 | |
| 2573 | void |
| 2574 | S_SET_FORWARD_REF (symbolS *s) |
| 2575 | { |
| 2576 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2577 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2578 | s->sy_flags.sy_forward_ref = 1; |
| 2579 | } |
| 2580 | |
| 2581 | /* Return the previous symbol in a chain. */ |
| 2582 | |
| 2583 | symbolS * |
| 2584 | symbol_previous (symbolS *s) |
| 2585 | { |
| 2586 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2587 | abort (); |
| 2588 | return s->sy_previous; |
| 2589 | } |
| 2590 | |
| 2591 | /* Return the next symbol in a chain. */ |
| 2592 | |
| 2593 | symbolS * |
| 2594 | symbol_next (symbolS *s) |
| 2595 | { |
| 2596 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2597 | abort (); |
| 2598 | return s->sy_next; |
| 2599 | } |
| 2600 | |
| 2601 | /* Return a pointer to the value of a symbol as an expression. */ |
| 2602 | |
| 2603 | expressionS * |
| 2604 | symbol_get_value_expression (symbolS *s) |
| 2605 | { |
| 2606 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2607 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2608 | return &s->sy_value; |
| 2609 | } |
| 2610 | |
| 2611 | /* Set the value of a symbol to an expression. */ |
| 2612 | |
| 2613 | void |
| 2614 | symbol_set_value_expression (symbolS *s, const expressionS *exp) |
| 2615 | { |
| 2616 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2617 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2618 | s->sy_value = *exp; |
| 2619 | S_CLEAR_WEAKREFR (s); |
| 2620 | } |
| 2621 | |
| 2622 | /* Return whether 2 symbols are the same. */ |
| 2623 | |
| 2624 | int |
| 2625 | symbol_same_p (symbolS *s1, symbolS *s2) |
| 2626 | { |
| 2627 | s1 = get_real_sym (s1); |
| 2628 | s2 = get_real_sym (s2); |
| 2629 | return s1 == s2; |
| 2630 | } |
| 2631 | |
| 2632 | /* Return a pointer to the X_add_number component of a symbol. */ |
| 2633 | |
| 2634 | offsetT * |
| 2635 | symbol_X_add_number (symbolS *s) |
| 2636 | { |
| 2637 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2638 | return (offsetT *) &((struct local_symbol *) s)->lsy_value; |
| 2639 | |
| 2640 | return &s->sy_value.X_add_number; |
| 2641 | } |
| 2642 | |
| 2643 | /* Set the value of SYM to the current position in the current segment. */ |
| 2644 | |
| 2645 | void |
| 2646 | symbol_set_value_now (symbolS *sym) |
| 2647 | { |
| 2648 | S_SET_SEGMENT (sym, now_seg); |
| 2649 | S_SET_VALUE (sym, frag_now_fix ()); |
| 2650 | symbol_set_frag (sym, frag_now); |
| 2651 | } |
| 2652 | |
| 2653 | /* Set the frag of a symbol. */ |
| 2654 | |
| 2655 | void |
| 2656 | symbol_set_frag (symbolS *s, fragS *f) |
| 2657 | { |
| 2658 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2659 | { |
| 2660 | local_symbol_set_frag ((struct local_symbol *) s, f); |
| 2661 | return; |
| 2662 | } |
| 2663 | s->sy_frag = f; |
| 2664 | S_CLEAR_WEAKREFR (s); |
| 2665 | } |
| 2666 | |
| 2667 | /* Return the frag of a symbol. */ |
| 2668 | |
| 2669 | fragS * |
| 2670 | symbol_get_frag (symbolS *s) |
| 2671 | { |
| 2672 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2673 | return local_symbol_get_frag ((struct local_symbol *) s); |
| 2674 | return s->sy_frag; |
| 2675 | } |
| 2676 | |
| 2677 | /* Mark a symbol as having been used. */ |
| 2678 | |
| 2679 | void |
| 2680 | symbol_mark_used (symbolS *s) |
| 2681 | { |
| 2682 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2683 | return; |
| 2684 | s->sy_flags.sy_used = 1; |
| 2685 | if (S_IS_WEAKREFR (s)) |
| 2686 | symbol_mark_used (s->sy_value.X_add_symbol); |
| 2687 | } |
| 2688 | |
| 2689 | /* Clear the mark of whether a symbol has been used. */ |
| 2690 | |
| 2691 | void |
| 2692 | symbol_clear_used (symbolS *s) |
| 2693 | { |
| 2694 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2695 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2696 | s->sy_flags.sy_used = 0; |
| 2697 | } |
| 2698 | |
| 2699 | /* Return whether a symbol has been used. */ |
| 2700 | |
| 2701 | int |
| 2702 | symbol_used_p (symbolS *s) |
| 2703 | { |
| 2704 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2705 | return 1; |
| 2706 | return s->sy_flags.sy_used; |
| 2707 | } |
| 2708 | |
| 2709 | /* Mark a symbol as having been used in a reloc. */ |
| 2710 | |
| 2711 | void |
| 2712 | symbol_mark_used_in_reloc (symbolS *s) |
| 2713 | { |
| 2714 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2715 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2716 | s->sy_flags.sy_used_in_reloc = 1; |
| 2717 | } |
| 2718 | |
| 2719 | /* Clear the mark of whether a symbol has been used in a reloc. */ |
| 2720 | |
| 2721 | void |
| 2722 | symbol_clear_used_in_reloc (symbolS *s) |
| 2723 | { |
| 2724 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2725 | return; |
| 2726 | s->sy_flags.sy_used_in_reloc = 0; |
| 2727 | } |
| 2728 | |
| 2729 | /* Return whether a symbol has been used in a reloc. */ |
| 2730 | |
| 2731 | int |
| 2732 | symbol_used_in_reloc_p (symbolS *s) |
| 2733 | { |
| 2734 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2735 | return 0; |
| 2736 | return s->sy_flags.sy_used_in_reloc; |
| 2737 | } |
| 2738 | |
| 2739 | /* Mark a symbol as an MRI common symbol. */ |
| 2740 | |
| 2741 | void |
| 2742 | symbol_mark_mri_common (symbolS *s) |
| 2743 | { |
| 2744 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2745 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2746 | s->sy_flags.sy_mri_common = 1; |
| 2747 | } |
| 2748 | |
| 2749 | /* Clear the mark of whether a symbol is an MRI common symbol. */ |
| 2750 | |
| 2751 | void |
| 2752 | symbol_clear_mri_common (symbolS *s) |
| 2753 | { |
| 2754 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2755 | return; |
| 2756 | s->sy_flags.sy_mri_common = 0; |
| 2757 | } |
| 2758 | |
| 2759 | /* Return whether a symbol is an MRI common symbol. */ |
| 2760 | |
| 2761 | int |
| 2762 | symbol_mri_common_p (symbolS *s) |
| 2763 | { |
| 2764 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2765 | return 0; |
| 2766 | return s->sy_flags.sy_mri_common; |
| 2767 | } |
| 2768 | |
| 2769 | /* Mark a symbol as having been written. */ |
| 2770 | |
| 2771 | void |
| 2772 | symbol_mark_written (symbolS *s) |
| 2773 | { |
| 2774 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2775 | return; |
| 2776 | s->sy_flags.sy_written = 1; |
| 2777 | } |
| 2778 | |
| 2779 | /* Clear the mark of whether a symbol has been written. */ |
| 2780 | |
| 2781 | void |
| 2782 | symbol_clear_written (symbolS *s) |
| 2783 | { |
| 2784 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2785 | return; |
| 2786 | s->sy_flags.sy_written = 0; |
| 2787 | } |
| 2788 | |
| 2789 | /* Return whether a symbol has been written. */ |
| 2790 | |
| 2791 | int |
| 2792 | symbol_written_p (symbolS *s) |
| 2793 | { |
| 2794 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2795 | return 0; |
| 2796 | return s->sy_flags.sy_written; |
| 2797 | } |
| 2798 | |
| 2799 | /* Mark a symbol has having been resolved. */ |
| 2800 | |
| 2801 | void |
| 2802 | symbol_mark_resolved (symbolS *s) |
| 2803 | { |
| 2804 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2805 | { |
| 2806 | local_symbol_mark_resolved ((struct local_symbol *) s); |
| 2807 | return; |
| 2808 | } |
| 2809 | s->sy_flags.sy_resolved = 1; |
| 2810 | } |
| 2811 | |
| 2812 | /* Return whether a symbol has been resolved. */ |
| 2813 | |
| 2814 | int |
| 2815 | symbol_resolved_p (symbolS *s) |
| 2816 | { |
| 2817 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2818 | return local_symbol_resolved_p ((struct local_symbol *) s); |
| 2819 | return s->sy_flags.sy_resolved; |
| 2820 | } |
| 2821 | |
| 2822 | /* Return whether a symbol is a section symbol. */ |
| 2823 | |
| 2824 | int |
| 2825 | symbol_section_p (symbolS *s ATTRIBUTE_UNUSED) |
| 2826 | { |
| 2827 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2828 | return 0; |
| 2829 | return (s->bsym->flags & BSF_SECTION_SYM) != 0; |
| 2830 | } |
| 2831 | |
| 2832 | /* Return whether a symbol is equated to another symbol. */ |
| 2833 | |
| 2834 | int |
| 2835 | symbol_equated_p (symbolS *s) |
| 2836 | { |
| 2837 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2838 | return 0; |
| 2839 | return s->sy_value.X_op == O_symbol; |
| 2840 | } |
| 2841 | |
| 2842 | /* Return whether a symbol is equated to another symbol, and should be |
| 2843 | treated specially when writing out relocs. */ |
| 2844 | |
| 2845 | int |
| 2846 | symbol_equated_reloc_p (symbolS *s) |
| 2847 | { |
| 2848 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2849 | return 0; |
| 2850 | /* X_op_symbol, normally not used for O_symbol, is set by |
| 2851 | resolve_symbol_value to flag expression syms that have been |
| 2852 | equated. */ |
| 2853 | return (s->sy_value.X_op == O_symbol |
| 2854 | #if defined (OBJ_COFF) && defined (TE_PE) |
| 2855 | && ! S_IS_WEAK (s) |
| 2856 | #endif |
| 2857 | && ((s->sy_flags.sy_resolved && s->sy_value.X_op_symbol != NULL) |
| 2858 | || ! S_IS_DEFINED (s) |
| 2859 | || S_IS_COMMON (s))); |
| 2860 | } |
| 2861 | |
| 2862 | /* Return whether a symbol has a constant value. */ |
| 2863 | |
| 2864 | int |
| 2865 | symbol_constant_p (symbolS *s) |
| 2866 | { |
| 2867 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2868 | return 1; |
| 2869 | return s->sy_value.X_op == O_constant; |
| 2870 | } |
| 2871 | |
| 2872 | /* Return whether a symbol was cloned and thus removed from the global |
| 2873 | symbol list. */ |
| 2874 | |
| 2875 | int |
| 2876 | symbol_shadow_p (symbolS *s) |
| 2877 | { |
| 2878 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2879 | return 0; |
| 2880 | return s->sy_next == s; |
| 2881 | } |
| 2882 | |
| 2883 | /* If S was created as a struct symbol, return S, otherwise if S is a |
| 2884 | converted local_symbol return the converted symbol, otherwise |
| 2885 | return NULL. */ |
| 2886 | |
| 2887 | symbolS * |
| 2888 | symbol_symbolS (symbolS *s) |
| 2889 | { |
| 2890 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2891 | return NULL; |
| 2892 | return s; |
| 2893 | } |
| 2894 | |
| 2895 | /* Return the BFD symbol for a symbol. */ |
| 2896 | |
| 2897 | asymbol * |
| 2898 | symbol_get_bfdsym (symbolS *s) |
| 2899 | { |
| 2900 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2901 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2902 | return s->bsym; |
| 2903 | } |
| 2904 | |
| 2905 | /* Set the BFD symbol for a symbol. */ |
| 2906 | |
| 2907 | void |
| 2908 | symbol_set_bfdsym (symbolS *s, asymbol *bsym) |
| 2909 | { |
| 2910 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2911 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2912 | /* Usually, it is harmless to reset a symbol to a BFD section |
| 2913 | symbol. For example, obj_elf_change_section sets the BFD symbol |
| 2914 | of an old symbol with the newly created section symbol. But when |
| 2915 | we have multiple sections with the same name, the newly created |
| 2916 | section may have the same name as an old section. We check if the |
| 2917 | old symbol has been already marked as a section symbol before |
| 2918 | resetting it. */ |
| 2919 | if ((s->bsym->flags & BSF_SECTION_SYM) == 0) |
| 2920 | s->bsym = bsym; |
| 2921 | /* else XXX - What do we do now ? */ |
| 2922 | } |
| 2923 | |
| 2924 | #ifdef OBJ_SYMFIELD_TYPE |
| 2925 | |
| 2926 | /* Get a pointer to the object format information for a symbol. */ |
| 2927 | |
| 2928 | OBJ_SYMFIELD_TYPE * |
| 2929 | symbol_get_obj (symbolS *s) |
| 2930 | { |
| 2931 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2932 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2933 | return &s->sy_obj; |
| 2934 | } |
| 2935 | |
| 2936 | /* Set the object format information for a symbol. */ |
| 2937 | |
| 2938 | void |
| 2939 | symbol_set_obj (symbolS *s, OBJ_SYMFIELD_TYPE *o) |
| 2940 | { |
| 2941 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2942 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2943 | s->sy_obj = *o; |
| 2944 | } |
| 2945 | |
| 2946 | #endif /* OBJ_SYMFIELD_TYPE */ |
| 2947 | |
| 2948 | #ifdef TC_SYMFIELD_TYPE |
| 2949 | |
| 2950 | /* Get a pointer to the processor information for a symbol. */ |
| 2951 | |
| 2952 | TC_SYMFIELD_TYPE * |
| 2953 | symbol_get_tc (symbolS *s) |
| 2954 | { |
| 2955 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2956 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2957 | return &s->sy_tc; |
| 2958 | } |
| 2959 | |
| 2960 | /* Set the processor information for a symbol. */ |
| 2961 | |
| 2962 | void |
| 2963 | symbol_set_tc (symbolS *s, TC_SYMFIELD_TYPE *o) |
| 2964 | { |
| 2965 | if (LOCAL_SYMBOL_CHECK (s)) |
| 2966 | s = local_symbol_convert ((struct local_symbol *) s); |
| 2967 | s->sy_tc = *o; |
| 2968 | } |
| 2969 | |
| 2970 | #endif /* TC_SYMFIELD_TYPE */ |
| 2971 | |
| 2972 | void |
| 2973 | symbol_begin (void) |
| 2974 | { |
| 2975 | symbol_lastP = NULL; |
| 2976 | symbol_rootP = NULL; /* In case we have 0 symbols (!!) */ |
| 2977 | sy_hash = hash_new (); |
| 2978 | local_hash = hash_new (); |
| 2979 | |
| 2980 | memset ((char *) (&abs_symbol), '\0', sizeof (abs_symbol)); |
| 2981 | #if defined (EMIT_SECTION_SYMBOLS) || !defined (RELOC_REQUIRES_SYMBOL) |
| 2982 | abs_symbol.bsym = bfd_abs_section_ptr->symbol; |
| 2983 | #endif |
| 2984 | abs_symbol.sy_value.X_op = O_constant; |
| 2985 | abs_symbol.sy_frag = &zero_address_frag; |
| 2986 | |
| 2987 | if (LOCAL_LABELS_FB) |
| 2988 | fb_label_init (); |
| 2989 | } |
| 2990 | |
| 2991 | void |
| 2992 | dot_symbol_init (void) |
| 2993 | { |
| 2994 | dot_symbol.bsym = bfd_make_empty_symbol (stdoutput); |
| 2995 | if (dot_symbol.bsym == NULL) |
| 2996 | as_fatal ("bfd_make_empty_symbol: %s", bfd_errmsg (bfd_get_error ())); |
| 2997 | dot_symbol.bsym->name = "."; |
| 2998 | dot_symbol.sy_flags.sy_forward_ref = 1; |
| 2999 | dot_symbol.sy_value.X_op = O_constant; |
| 3000 | } |
| 3001 | \f |
| 3002 | int indent_level; |
| 3003 | |
| 3004 | /* Maximum indent level. |
| 3005 | Available for modification inside a gdb session. */ |
| 3006 | static int max_indent_level = 8; |
| 3007 | |
| 3008 | void |
| 3009 | print_symbol_value_1 (FILE *file, symbolS *sym) |
| 3010 | { |
| 3011 | const char *name = S_GET_NAME (sym); |
| 3012 | if (!name || !name[0]) |
| 3013 | name = "(unnamed)"; |
| 3014 | fprintf (file, "sym "); |
| 3015 | fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) sym)); |
| 3016 | fprintf (file, " %s", name); |
| 3017 | |
| 3018 | if (LOCAL_SYMBOL_CHECK (sym)) |
| 3019 | { |
| 3020 | struct local_symbol *locsym = (struct local_symbol *) sym; |
| 3021 | |
| 3022 | if (local_symbol_get_frag (locsym) != & zero_address_frag |
| 3023 | && local_symbol_get_frag (locsym) != NULL) |
| 3024 | { |
| 3025 | fprintf (file, " frag "); |
| 3026 | fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) local_symbol_get_frag (locsym))); |
| 3027 | } |
| 3028 | if (local_symbol_resolved_p (locsym)) |
| 3029 | fprintf (file, " resolved"); |
| 3030 | fprintf (file, " local"); |
| 3031 | } |
| 3032 | else |
| 3033 | { |
| 3034 | if (sym->sy_frag != &zero_address_frag) |
| 3035 | { |
| 3036 | fprintf (file, " frag "); |
| 3037 | fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) sym->sy_frag)); |
| 3038 | } |
| 3039 | if (sym->sy_flags.sy_written) |
| 3040 | fprintf (file, " written"); |
| 3041 | if (sym->sy_flags.sy_resolved) |
| 3042 | fprintf (file, " resolved"); |
| 3043 | else if (sym->sy_flags.sy_resolving) |
| 3044 | fprintf (file, " resolving"); |
| 3045 | if (sym->sy_flags.sy_used_in_reloc) |
| 3046 | fprintf (file, " used-in-reloc"); |
| 3047 | if (sym->sy_flags.sy_used) |
| 3048 | fprintf (file, " used"); |
| 3049 | if (S_IS_LOCAL (sym)) |
| 3050 | fprintf (file, " local"); |
| 3051 | if (S_IS_EXTERNAL (sym)) |
| 3052 | fprintf (file, " extern"); |
| 3053 | if (S_IS_WEAK (sym)) |
| 3054 | fprintf (file, " weak"); |
| 3055 | if (S_IS_DEBUG (sym)) |
| 3056 | fprintf (file, " debug"); |
| 3057 | if (S_IS_DEFINED (sym)) |
| 3058 | fprintf (file, " defined"); |
| 3059 | } |
| 3060 | if (S_IS_WEAKREFR (sym)) |
| 3061 | fprintf (file, " weakrefr"); |
| 3062 | if (S_IS_WEAKREFD (sym)) |
| 3063 | fprintf (file, " weakrefd"); |
| 3064 | fprintf (file, " %s", segment_name (S_GET_SEGMENT (sym))); |
| 3065 | if (symbol_resolved_p (sym)) |
| 3066 | { |
| 3067 | segT s = S_GET_SEGMENT (sym); |
| 3068 | |
| 3069 | if (s != undefined_section |
| 3070 | && s != expr_section) |
| 3071 | fprintf (file, " %lx", (unsigned long) S_GET_VALUE (sym)); |
| 3072 | } |
| 3073 | else if (indent_level < max_indent_level |
| 3074 | && S_GET_SEGMENT (sym) != undefined_section) |
| 3075 | { |
| 3076 | indent_level++; |
| 3077 | fprintf (file, "\n%*s<", indent_level * 4, ""); |
| 3078 | if (LOCAL_SYMBOL_CHECK (sym)) |
| 3079 | fprintf (file, "constant %lx", |
| 3080 | (unsigned long) ((struct local_symbol *) sym)->lsy_value); |
| 3081 | else |
| 3082 | print_expr_1 (file, &sym->sy_value); |
| 3083 | fprintf (file, ">"); |
| 3084 | indent_level--; |
| 3085 | } |
| 3086 | fflush (file); |
| 3087 | } |
| 3088 | |
| 3089 | void |
| 3090 | print_symbol_value (symbolS *sym) |
| 3091 | { |
| 3092 | indent_level = 0; |
| 3093 | print_symbol_value_1 (stderr, sym); |
| 3094 | fprintf (stderr, "\n"); |
| 3095 | } |
| 3096 | |
| 3097 | static void |
| 3098 | print_binary (FILE *file, const char *name, expressionS *exp) |
| 3099 | { |
| 3100 | indent_level++; |
| 3101 | fprintf (file, "%s\n%*s<", name, indent_level * 4, ""); |
| 3102 | print_symbol_value_1 (file, exp->X_add_symbol); |
| 3103 | fprintf (file, ">\n%*s<", indent_level * 4, ""); |
| 3104 | print_symbol_value_1 (file, exp->X_op_symbol); |
| 3105 | fprintf (file, ">"); |
| 3106 | indent_level--; |
| 3107 | } |
| 3108 | |
| 3109 | void |
| 3110 | print_expr_1 (FILE *file, expressionS *exp) |
| 3111 | { |
| 3112 | fprintf (file, "expr "); |
| 3113 | fprintf_vma (file, (bfd_vma) ((bfd_hostptr_t) exp)); |
| 3114 | fprintf (file, " "); |
| 3115 | switch (exp->X_op) |
| 3116 | { |
| 3117 | case O_illegal: |
| 3118 | fprintf (file, "illegal"); |
| 3119 | break; |
| 3120 | case O_absent: |
| 3121 | fprintf (file, "absent"); |
| 3122 | break; |
| 3123 | case O_constant: |
| 3124 | fprintf (file, "constant %lx", (unsigned long) exp->X_add_number); |
| 3125 | break; |
| 3126 | case O_symbol: |
| 3127 | indent_level++; |
| 3128 | fprintf (file, "symbol\n%*s<", indent_level * 4, ""); |
| 3129 | print_symbol_value_1 (file, exp->X_add_symbol); |
| 3130 | fprintf (file, ">"); |
| 3131 | maybe_print_addnum: |
| 3132 | if (exp->X_add_number) |
| 3133 | fprintf (file, "\n%*s%lx", indent_level * 4, "", |
| 3134 | (unsigned long) exp->X_add_number); |
| 3135 | indent_level--; |
| 3136 | break; |
| 3137 | case O_register: |
| 3138 | fprintf (file, "register #%d", (int) exp->X_add_number); |
| 3139 | break; |
| 3140 | case O_big: |
| 3141 | fprintf (file, "big"); |
| 3142 | break; |
| 3143 | case O_uminus: |
| 3144 | fprintf (file, "uminus -<"); |
| 3145 | indent_level++; |
| 3146 | print_symbol_value_1 (file, exp->X_add_symbol); |
| 3147 | fprintf (file, ">"); |
| 3148 | goto maybe_print_addnum; |
| 3149 | case O_bit_not: |
| 3150 | fprintf (file, "bit_not"); |
| 3151 | break; |
| 3152 | case O_multiply: |
| 3153 | print_binary (file, "multiply", exp); |
| 3154 | break; |
| 3155 | case O_divide: |
| 3156 | print_binary (file, "divide", exp); |
| 3157 | break; |
| 3158 | case O_modulus: |
| 3159 | print_binary (file, "modulus", exp); |
| 3160 | break; |
| 3161 | case O_left_shift: |
| 3162 | print_binary (file, "lshift", exp); |
| 3163 | break; |
| 3164 | case O_right_shift: |
| 3165 | print_binary (file, "rshift", exp); |
| 3166 | break; |
| 3167 | case O_bit_inclusive_or: |
| 3168 | print_binary (file, "bit_ior", exp); |
| 3169 | break; |
| 3170 | case O_bit_exclusive_or: |
| 3171 | print_binary (file, "bit_xor", exp); |
| 3172 | break; |
| 3173 | case O_bit_and: |
| 3174 | print_binary (file, "bit_and", exp); |
| 3175 | break; |
| 3176 | case O_eq: |
| 3177 | print_binary (file, "eq", exp); |
| 3178 | break; |
| 3179 | case O_ne: |
| 3180 | print_binary (file, "ne", exp); |
| 3181 | break; |
| 3182 | case O_lt: |
| 3183 | print_binary (file, "lt", exp); |
| 3184 | break; |
| 3185 | case O_le: |
| 3186 | print_binary (file, "le", exp); |
| 3187 | break; |
| 3188 | case O_ge: |
| 3189 | print_binary (file, "ge", exp); |
| 3190 | break; |
| 3191 | case O_gt: |
| 3192 | print_binary (file, "gt", exp); |
| 3193 | break; |
| 3194 | case O_logical_and: |
| 3195 | print_binary (file, "logical_and", exp); |
| 3196 | break; |
| 3197 | case O_logical_or: |
| 3198 | print_binary (file, "logical_or", exp); |
| 3199 | break; |
| 3200 | case O_add: |
| 3201 | indent_level++; |
| 3202 | fprintf (file, "add\n%*s<", indent_level * 4, ""); |
| 3203 | print_symbol_value_1 (file, exp->X_add_symbol); |
| 3204 | fprintf (file, ">\n%*s<", indent_level * 4, ""); |
| 3205 | print_symbol_value_1 (file, exp->X_op_symbol); |
| 3206 | fprintf (file, ">"); |
| 3207 | goto maybe_print_addnum; |
| 3208 | case O_subtract: |
| 3209 | indent_level++; |
| 3210 | fprintf (file, "subtract\n%*s<", indent_level * 4, ""); |
| 3211 | print_symbol_value_1 (file, exp->X_add_symbol); |
| 3212 | fprintf (file, ">\n%*s<", indent_level * 4, ""); |
| 3213 | print_symbol_value_1 (file, exp->X_op_symbol); |
| 3214 | fprintf (file, ">"); |
| 3215 | goto maybe_print_addnum; |
| 3216 | default: |
| 3217 | fprintf (file, "{unknown opcode %d}", (int) exp->X_op); |
| 3218 | break; |
| 3219 | } |
| 3220 | fflush (stdout); |
| 3221 | } |
| 3222 | |
| 3223 | void |
| 3224 | print_expr (expressionS *exp) |
| 3225 | { |
| 3226 | print_expr_1 (stderr, exp); |
| 3227 | fprintf (stderr, "\n"); |
| 3228 | } |
| 3229 | |
| 3230 | void |
| 3231 | symbol_print_statistics (FILE *file) |
| 3232 | { |
| 3233 | hash_print_statistics (file, "symbol table", sy_hash); |
| 3234 | hash_print_statistics (file, "mini local symbol table", local_hash); |
| 3235 | fprintf (file, "%lu mini local symbols created, %lu converted\n", |
| 3236 | local_symbol_count, local_symbol_conversion_count); |
| 3237 | } |
| 3238 | |
| 3239 | #ifdef OBJ_COMPLEX_RELC |
| 3240 | |
| 3241 | /* Convert given symbol to a new complex-relocation symbol name. This |
| 3242 | may be a recursive function, since it might be called for non-leaf |
| 3243 | nodes (plain symbols) in the expression tree. The caller owns the |
| 3244 | returning string, so should free it eventually. Errors are |
| 3245 | indicated via as_bad and a NULL return value. The given symbol |
| 3246 | is marked with sy_used_in_reloc. */ |
| 3247 | |
| 3248 | char * |
| 3249 | symbol_relc_make_sym (symbolS * sym) |
| 3250 | { |
| 3251 | char * terminal = NULL; |
| 3252 | const char * sname; |
| 3253 | char typetag; |
| 3254 | int sname_len; |
| 3255 | |
| 3256 | gas_assert (sym != NULL); |
| 3257 | |
| 3258 | /* Recurse to symbol_relc_make_expr if this symbol |
| 3259 | is defined as an expression or a plain value. */ |
| 3260 | if ( S_GET_SEGMENT (sym) == expr_section |
| 3261 | || S_GET_SEGMENT (sym) == absolute_section) |
| 3262 | return symbol_relc_make_expr (& sym->sy_value); |
| 3263 | |
| 3264 | /* This may be a "fake symbol", referring to ".". |
| 3265 | Write out a special null symbol to refer to this position. */ |
| 3266 | if (! strcmp (S_GET_NAME (sym), FAKE_LABEL_NAME)) |
| 3267 | return xstrdup ("."); |
| 3268 | |
| 3269 | /* We hope this is a plain leaf symbol. Construct the encoding |
| 3270 | as {S,s}II...:CCCCCCC.... |
| 3271 | where 'S'/'s' means section symbol / plain symbol |
| 3272 | III is decimal for the symbol name length |
| 3273 | CCC is the symbol name itself. */ |
| 3274 | symbol_mark_used_in_reloc (sym); |
| 3275 | |
| 3276 | sname = S_GET_NAME (sym); |
| 3277 | sname_len = strlen (sname); |
| 3278 | typetag = symbol_section_p (sym) ? 'S' : 's'; |
| 3279 | |
| 3280 | terminal = XNEWVEC (char, (1 /* S or s */ |
| 3281 | + 8 /* sname_len in decimal */ |
| 3282 | + 1 /* _ spacer */ |
| 3283 | + sname_len /* name itself */ |
| 3284 | + 1 /* \0 */ )); |
| 3285 | |
| 3286 | sprintf (terminal, "%c%d:%s", typetag, sname_len, sname); |
| 3287 | return terminal; |
| 3288 | } |
| 3289 | |
| 3290 | /* Convert given value to a new complex-relocation symbol name. This |
| 3291 | is a non-recursive function, since it is be called for leaf nodes |
| 3292 | (plain values) in the expression tree. The caller owns the |
| 3293 | returning string, so should free() it eventually. No errors. */ |
| 3294 | |
| 3295 | char * |
| 3296 | symbol_relc_make_value (offsetT val) |
| 3297 | { |
| 3298 | char * terminal = XNEWVEC (char, 28); /* Enough for long long. */ |
| 3299 | |
| 3300 | terminal[0] = '#'; |
| 3301 | bfd_sprintf_vma (stdoutput, terminal + 1, val); |
| 3302 | return terminal; |
| 3303 | } |
| 3304 | |
| 3305 | /* Convert given expression to a new complex-relocation symbol name. |
| 3306 | This is a recursive function, since it traverses the entire given |
| 3307 | expression tree. The caller owns the returning string, so should |
| 3308 | free() it eventually. Errors are indicated via as_bad() and a NULL |
| 3309 | return value. */ |
| 3310 | |
| 3311 | char * |
| 3312 | symbol_relc_make_expr (expressionS * exp) |
| 3313 | { |
| 3314 | const char * opstr = NULL; /* Operator prefix string. */ |
| 3315 | int arity = 0; /* Arity of this operator. */ |
| 3316 | char * operands[3]; /* Up to three operands. */ |
| 3317 | char * concat_string = NULL; |
| 3318 | |
| 3319 | operands[0] = operands[1] = operands[2] = NULL; |
| 3320 | |
| 3321 | gas_assert (exp != NULL); |
| 3322 | |
| 3323 | /* Match known operators -> fill in opstr, arity, operands[] and fall |
| 3324 | through to construct subexpression fragments; may instead return |
| 3325 | string directly for leaf nodes. */ |
| 3326 | |
| 3327 | /* See expr.h for the meaning of all these enums. Many operators |
| 3328 | have an unnatural arity (X_add_number implicitly added). The |
| 3329 | conversion logic expands them to explicit "+" subexpressions. */ |
| 3330 | |
| 3331 | switch (exp->X_op) |
| 3332 | { |
| 3333 | default: |
| 3334 | as_bad ("Unknown expression operator (enum %d)", exp->X_op); |
| 3335 | break; |
| 3336 | |
| 3337 | /* Leaf nodes. */ |
| 3338 | case O_constant: |
| 3339 | return symbol_relc_make_value (exp->X_add_number); |
| 3340 | |
| 3341 | case O_symbol: |
| 3342 | if (exp->X_add_number) |
| 3343 | { |
| 3344 | arity = 2; |
| 3345 | opstr = "+"; |
| 3346 | operands[0] = symbol_relc_make_sym (exp->X_add_symbol); |
| 3347 | operands[1] = symbol_relc_make_value (exp->X_add_number); |
| 3348 | break; |
| 3349 | } |
| 3350 | else |
| 3351 | return symbol_relc_make_sym (exp->X_add_symbol); |
| 3352 | |
| 3353 | /* Helper macros for nesting nodes. */ |
| 3354 | |
| 3355 | #define HANDLE_XADD_OPT1(str_) \ |
| 3356 | if (exp->X_add_number) \ |
| 3357 | { \ |
| 3358 | arity = 2; \ |
| 3359 | opstr = "+:" str_; \ |
| 3360 | operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \ |
| 3361 | operands[1] = symbol_relc_make_value (exp->X_add_number); \ |
| 3362 | break; \ |
| 3363 | } \ |
| 3364 | else \ |
| 3365 | { \ |
| 3366 | arity = 1; \ |
| 3367 | opstr = str_; \ |
| 3368 | operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \ |
| 3369 | } \ |
| 3370 | break |
| 3371 | |
| 3372 | #define HANDLE_XADD_OPT2(str_) \ |
| 3373 | if (exp->X_add_number) \ |
| 3374 | { \ |
| 3375 | arity = 3; \ |
| 3376 | opstr = "+:" str_; \ |
| 3377 | operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \ |
| 3378 | operands[1] = symbol_relc_make_sym (exp->X_op_symbol); \ |
| 3379 | operands[2] = symbol_relc_make_value (exp->X_add_number); \ |
| 3380 | } \ |
| 3381 | else \ |
| 3382 | { \ |
| 3383 | arity = 2; \ |
| 3384 | opstr = str_; \ |
| 3385 | operands[0] = symbol_relc_make_sym (exp->X_add_symbol); \ |
| 3386 | operands[1] = symbol_relc_make_sym (exp->X_op_symbol); \ |
| 3387 | } \ |
| 3388 | break |
| 3389 | |
| 3390 | /* Nesting nodes. */ |
| 3391 | |
| 3392 | case O_uminus: HANDLE_XADD_OPT1 ("0-"); |
| 3393 | case O_bit_not: HANDLE_XADD_OPT1 ("~"); |
| 3394 | case O_logical_not: HANDLE_XADD_OPT1 ("!"); |
| 3395 | case O_multiply: HANDLE_XADD_OPT2 ("*"); |
| 3396 | case O_divide: HANDLE_XADD_OPT2 ("/"); |
| 3397 | case O_modulus: HANDLE_XADD_OPT2 ("%"); |
| 3398 | case O_left_shift: HANDLE_XADD_OPT2 ("<<"); |
| 3399 | case O_right_shift: HANDLE_XADD_OPT2 (">>"); |
| 3400 | case O_bit_inclusive_or: HANDLE_XADD_OPT2 ("|"); |
| 3401 | case O_bit_exclusive_or: HANDLE_XADD_OPT2 ("^"); |
| 3402 | case O_bit_and: HANDLE_XADD_OPT2 ("&"); |
| 3403 | case O_add: HANDLE_XADD_OPT2 ("+"); |
| 3404 | case O_subtract: HANDLE_XADD_OPT2 ("-"); |
| 3405 | case O_eq: HANDLE_XADD_OPT2 ("=="); |
| 3406 | case O_ne: HANDLE_XADD_OPT2 ("!="); |
| 3407 | case O_lt: HANDLE_XADD_OPT2 ("<"); |
| 3408 | case O_le: HANDLE_XADD_OPT2 ("<="); |
| 3409 | case O_ge: HANDLE_XADD_OPT2 (">="); |
| 3410 | case O_gt: HANDLE_XADD_OPT2 (">"); |
| 3411 | case O_logical_and: HANDLE_XADD_OPT2 ("&&"); |
| 3412 | case O_logical_or: HANDLE_XADD_OPT2 ("||"); |
| 3413 | } |
| 3414 | |
| 3415 | /* Validate & reject early. */ |
| 3416 | if (arity >= 1 && ((operands[0] == NULL) || (strlen (operands[0]) == 0))) |
| 3417 | opstr = NULL; |
| 3418 | if (arity >= 2 && ((operands[1] == NULL) || (strlen (operands[1]) == 0))) |
| 3419 | opstr = NULL; |
| 3420 | if (arity >= 3 && ((operands[2] == NULL) || (strlen (operands[2]) == 0))) |
| 3421 | opstr = NULL; |
| 3422 | |
| 3423 | if (opstr == NULL) |
| 3424 | concat_string = NULL; |
| 3425 | else if (arity == 0) |
| 3426 | concat_string = xstrdup (opstr); |
| 3427 | else if (arity == 1) |
| 3428 | concat_string = concat (opstr, ":", operands[0], (char *) NULL); |
| 3429 | else if (arity == 2) |
| 3430 | concat_string = concat (opstr, ":", operands[0], ":", operands[1], |
| 3431 | (char *) NULL); |
| 3432 | else |
| 3433 | concat_string = concat (opstr, ":", operands[0], ":", operands[1], ":", |
| 3434 | operands[2], (char *) NULL); |
| 3435 | |
| 3436 | /* Free operand strings (not opstr). */ |
| 3437 | if (arity >= 1) xfree (operands[0]); |
| 3438 | if (arity >= 2) xfree (operands[1]); |
| 3439 | if (arity >= 3) xfree (operands[2]); |
| 3440 | |
| 3441 | return concat_string; |
| 3442 | } |
| 3443 | |
| 3444 | #endif |