| 1 | /* script-c.h -- C interface for linker scripts in gold. */ |
| 2 | |
| 3 | /* Copyright (C) 2006-2014 Free Software Foundation, Inc. |
| 4 | Written by Ian Lance Taylor <iant@google.com>. |
| 5 | |
| 6 | This file is part of gold. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | /* This file exists so that both the bison parser and script.cc can |
| 24 | include it, so that they can communicate back and forth. */ |
| 25 | |
| 26 | #ifndef GOLD_SCRIPT_C_H |
| 27 | #define GOLD_SCRIPT_C_H |
| 28 | |
| 29 | #ifdef __cplusplus |
| 30 | #include <vector> |
| 31 | #include <string> |
| 32 | #endif |
| 33 | |
| 34 | #ifdef __cplusplus |
| 35 | |
| 36 | // For the C++ code we declare the various supporting structures in |
| 37 | // the gold namespace. For the C code we declare it at the top level. |
| 38 | // The namespace level should not affect the layout of the structure. |
| 39 | |
| 40 | namespace gold |
| 41 | { |
| 42 | #endif |
| 43 | |
| 44 | /* A string value for the bison parser. */ |
| 45 | |
| 46 | struct Parser_string |
| 47 | { |
| 48 | const char* value; |
| 49 | size_t length; |
| 50 | }; |
| 51 | |
| 52 | /* The expression functions deal with pointers to Expression objects. |
| 53 | Since the bison parser generates C code, this is a hack to keep the |
| 54 | C++ code type safe. This hacks assumes that all pointers look |
| 55 | alike. */ |
| 56 | |
| 57 | #ifdef __cplusplus |
| 58 | class Expression; |
| 59 | typedef Expression* Expression_ptr; |
| 60 | #else |
| 61 | typedef void* Expression_ptr; |
| 62 | #endif |
| 63 | |
| 64 | /* Script_section type. */ |
| 65 | enum Script_section_type |
| 66 | { |
| 67 | /* No section type. */ |
| 68 | SCRIPT_SECTION_TYPE_NONE, |
| 69 | SCRIPT_SECTION_TYPE_NOLOAD, |
| 70 | SCRIPT_SECTION_TYPE_DSECT, |
| 71 | SCRIPT_SECTION_TYPE_COPY, |
| 72 | SCRIPT_SECTION_TYPE_INFO, |
| 73 | SCRIPT_SECTION_TYPE_OVERLAY |
| 74 | }; |
| 75 | |
| 76 | /* A constraint for whether to use a particular output section |
| 77 | definition. */ |
| 78 | |
| 79 | enum Section_constraint |
| 80 | { |
| 81 | /* No constraint. */ |
| 82 | CONSTRAINT_NONE, |
| 83 | /* Only if all input sections are read-only. */ |
| 84 | CONSTRAINT_ONLY_IF_RO, |
| 85 | /* Only if at least input section is writable. */ |
| 86 | CONSTRAINT_ONLY_IF_RW, |
| 87 | /* Special constraint. */ |
| 88 | CONSTRAINT_SPECIAL |
| 89 | }; |
| 90 | |
| 91 | /* The information we store for an output section header in the bison |
| 92 | parser. */ |
| 93 | |
| 94 | struct Parser_output_section_header |
| 95 | { |
| 96 | /* The address. This may be NULL. */ |
| 97 | Expression_ptr address; |
| 98 | /* Section type. May be NULL string. */ |
| 99 | enum Script_section_type section_type; |
| 100 | /* The load address, from the AT specifier. This may be NULL. */ |
| 101 | Expression_ptr load_address; |
| 102 | /* The alignment, from the ALIGN specifier. This may be NULL. */ |
| 103 | Expression_ptr align; |
| 104 | /* The input section alignment, from the SUBALIGN specifier. This |
| 105 | may be NULL. */ |
| 106 | Expression_ptr subalign; |
| 107 | /* A constraint on this output section. */ |
| 108 | enum Section_constraint constraint; |
| 109 | }; |
| 110 | |
| 111 | /* We keep vectors of strings. In order to manage this in both C and |
| 112 | C++, we use a pointer to a vector. This assumes that all pointers |
| 113 | look the same. */ |
| 114 | |
| 115 | #ifdef __cplusplus |
| 116 | typedef std::vector<std::string> String_list; |
| 117 | typedef String_list* String_list_ptr; |
| 118 | #else |
| 119 | typedef void* String_list_ptr; |
| 120 | #endif |
| 121 | |
| 122 | /* The information we store for an output section trailer in the bison |
| 123 | parser. */ |
| 124 | |
| 125 | struct Parser_output_section_trailer |
| 126 | { |
| 127 | /* The fill value. This may be NULL. */ |
| 128 | Expression_ptr fill; |
| 129 | /* The program segments this section should go into. This may be |
| 130 | NULL. */ |
| 131 | String_list_ptr phdrs; |
| 132 | }; |
| 133 | |
| 134 | /* The different sorts we can find in a linker script. */ |
| 135 | |
| 136 | enum Sort_wildcard |
| 137 | { |
| 138 | SORT_WILDCARD_NONE, |
| 139 | SORT_WILDCARD_BY_NAME, |
| 140 | SORT_WILDCARD_BY_ALIGNMENT, |
| 141 | SORT_WILDCARD_BY_NAME_BY_ALIGNMENT, |
| 142 | SORT_WILDCARD_BY_ALIGNMENT_BY_NAME |
| 143 | }; |
| 144 | |
| 145 | /* The information we build for a single wildcard specification. */ |
| 146 | |
| 147 | struct Wildcard_section |
| 148 | { |
| 149 | /* The wildcard spec itself. */ |
| 150 | struct Parser_string name; |
| 151 | /* How the entries should be sorted. */ |
| 152 | enum Sort_wildcard sort; |
| 153 | }; |
| 154 | |
| 155 | /* A vector of Wildcard_section entries. */ |
| 156 | |
| 157 | #ifdef __cplusplus |
| 158 | typedef std::vector<Wildcard_section> String_sort_list; |
| 159 | typedef String_sort_list* String_sort_list_ptr; |
| 160 | #else |
| 161 | typedef void* String_sort_list_ptr; |
| 162 | #endif |
| 163 | |
| 164 | /* A list of wildcard specifications, which may include EXCLUDE_FILE |
| 165 | clauses. */ |
| 166 | |
| 167 | struct Wildcard_sections |
| 168 | { |
| 169 | /* Wildcard specs. */ |
| 170 | String_sort_list_ptr sections; |
| 171 | /* Exclusions. */ |
| 172 | String_list_ptr exclude; |
| 173 | }; |
| 174 | |
| 175 | /* A complete input section specification. */ |
| 176 | |
| 177 | struct Input_section_spec |
| 178 | { |
| 179 | /* The file name. */ |
| 180 | struct Wildcard_section file; |
| 181 | /* The list of sections. */ |
| 182 | struct Wildcard_sections input_sections; |
| 183 | }; |
| 184 | |
| 185 | /* Information for a program header. */ |
| 186 | |
| 187 | struct Phdr_info |
| 188 | { |
| 189 | /* A boolean value: whether to include the file header. */ |
| 190 | int includes_filehdr; |
| 191 | /* A boolean value: whether to include the program headers. */ |
| 192 | int includes_phdrs; |
| 193 | /* A boolean value: whether the flags field is valid. */ |
| 194 | int is_flags_valid; |
| 195 | /* The value to use for the flags. */ |
| 196 | unsigned int flags; |
| 197 | /* The load address. */ |
| 198 | Expression_ptr load_address; |
| 199 | }; |
| 200 | |
| 201 | struct Version_dependency_list; |
| 202 | struct Version_expression_list; |
| 203 | struct Version_tree; |
| 204 | |
| 205 | #ifdef __cplusplus |
| 206 | extern "C" { |
| 207 | #endif |
| 208 | |
| 209 | /* The bison parser definitions. */ |
| 210 | |
| 211 | #include "yyscript.h" |
| 212 | |
| 213 | /* The bison parser function. */ |
| 214 | |
| 215 | extern int |
| 216 | yyparse(void* closure); |
| 217 | |
| 218 | /* Called by the bison parser skeleton to return the next token. */ |
| 219 | |
| 220 | extern int |
| 221 | yylex(YYSTYPE*, void* closure); |
| 222 | |
| 223 | /* Called by the bison parser skeleton to report an error. */ |
| 224 | |
| 225 | extern void |
| 226 | yyerror(void* closure, const char*); |
| 227 | |
| 228 | /* Called by the bison parser to add an external symbol (a symbol in |
| 229 | an EXTERN declaration) to the link. */ |
| 230 | |
| 231 | extern void |
| 232 | script_add_extern(void* closure, const char*, size_t); |
| 233 | |
| 234 | /* Called by the bison parser to add a file to the link. */ |
| 235 | |
| 236 | extern void |
| 237 | script_add_file(void* closure, const char*, size_t); |
| 238 | |
| 239 | /* Called by the bison parser to add a library to the link. */ |
| 240 | |
| 241 | extern void |
| 242 | script_add_library(void* closure, const char*, size_t); |
| 243 | |
| 244 | /* Called by the bison parser to start and stop a group. */ |
| 245 | |
| 246 | extern void |
| 247 | script_start_group(void* closure); |
| 248 | extern void |
| 249 | script_end_group(void* closure); |
| 250 | |
| 251 | /* Called by the bison parser to start and end an AS_NEEDED list. */ |
| 252 | |
| 253 | extern void |
| 254 | script_start_as_needed(void* closure); |
| 255 | extern void |
| 256 | script_end_as_needed(void* closure); |
| 257 | |
| 258 | /* Called by the bison parser to set the entry symbol. */ |
| 259 | |
| 260 | extern void |
| 261 | script_set_entry(void* closure, const char*, size_t); |
| 262 | |
| 263 | /* Called by the bison parser to set whether to define common symbols. */ |
| 264 | |
| 265 | extern void |
| 266 | script_set_common_allocation(void* closure, int); |
| 267 | |
| 268 | /* Called by the bison parser to parse an OPTION. */ |
| 269 | |
| 270 | extern void |
| 271 | script_parse_option(void* closure, const char*, size_t); |
| 272 | |
| 273 | /* Called by the bison parser to handle OUTPUT_FORMAT. This return 0 |
| 274 | if the parse should be aborted. */ |
| 275 | |
| 276 | extern int |
| 277 | script_check_output_format(void* closure, const char*, size_t, |
| 278 | const char*, size_t, const char*, size_t); |
| 279 | |
| 280 | /* Called by the bison parser to handle TARGET. */ |
| 281 | extern void |
| 282 | script_set_target(void* closure, const char*, size_t); |
| 283 | |
| 284 | /* Called by the bison parser to handle SEARCH_DIR. */ |
| 285 | |
| 286 | extern void |
| 287 | script_add_search_dir(void* closure, const char*, size_t); |
| 288 | |
| 289 | /* Called by the bison parser to push the lexer into expression |
| 290 | mode. */ |
| 291 | |
| 292 | extern void |
| 293 | script_push_lex_into_expression_mode(void* closure); |
| 294 | |
| 295 | /* Called by the bison parser to push the lexer into version |
| 296 | mode. */ |
| 297 | |
| 298 | extern void |
| 299 | script_push_lex_into_version_mode(void* closure); |
| 300 | |
| 301 | /* Called by the bison parser to pop the lexer mode. */ |
| 302 | |
| 303 | extern void |
| 304 | script_pop_lex_mode(void* closure); |
| 305 | |
| 306 | /* Called by the bison parser to get the value of a symbol. This is |
| 307 | called for a reference to a symbol, but is not called for something |
| 308 | like "sym += 10". Uses of the special symbol "." can just call |
| 309 | script_exp_string. */ |
| 310 | |
| 311 | extern Expression_ptr |
| 312 | script_symbol(void* closure, const char*, size_t); |
| 313 | |
| 314 | /* Called by the bison parser to set a symbol to a value. PROVIDE is |
| 315 | non-zero if the symbol should be provided--only defined if there is |
| 316 | an undefined reference. HIDDEN is non-zero if the symbol should be |
| 317 | hidden. */ |
| 318 | |
| 319 | extern void |
| 320 | script_set_symbol(void* closure, const char*, size_t, Expression_ptr, |
| 321 | int provide, int hidden); |
| 322 | |
| 323 | /* Called by the bison parser to add an assertion. */ |
| 324 | |
| 325 | extern void |
| 326 | script_add_assertion(void* closure, Expression_ptr, const char* message, |
| 327 | size_t messagelen); |
| 328 | |
| 329 | /* Called by the bison parser to start a SECTIONS clause. */ |
| 330 | |
| 331 | extern void |
| 332 | script_start_sections(void* closure); |
| 333 | |
| 334 | /* Called by the bison parser to finish a SECTIONS clause. */ |
| 335 | |
| 336 | extern void |
| 337 | script_finish_sections(void* closure); |
| 338 | |
| 339 | /* Called by the bison parser to start handling input section |
| 340 | specifications for an output section. */ |
| 341 | |
| 342 | extern void |
| 343 | script_start_output_section(void* closure, const char* name, size_t namelen, |
| 344 | const struct Parser_output_section_header*); |
| 345 | |
| 346 | /* Called by the bison parser when done handling input section |
| 347 | specifications for an output section. */ |
| 348 | |
| 349 | extern void |
| 350 | script_finish_output_section(void* closure, |
| 351 | const struct Parser_output_section_trailer*); |
| 352 | |
| 353 | /* Called by the bison parser to handle a data statement (LONG, BYTE, |
| 354 | etc.) in an output section. */ |
| 355 | |
| 356 | extern void |
| 357 | script_add_data(void* closure, int data_token, Expression_ptr val); |
| 358 | |
| 359 | /* Called by the bison parser to set the fill value in an output |
| 360 | section. */ |
| 361 | |
| 362 | extern void |
| 363 | script_add_fill(void* closure, Expression_ptr val); |
| 364 | |
| 365 | /* Called by the bison parser to add an input section specification to |
| 366 | an output section. The KEEP parameter is non-zero if this is |
| 367 | within a KEEP clause, meaning that the garbage collector should not |
| 368 | discard it. */ |
| 369 | |
| 370 | extern void |
| 371 | script_add_input_section(void* closure, const struct Input_section_spec*, |
| 372 | int keep); |
| 373 | |
| 374 | /* Create a new list of string and sort entries. */ |
| 375 | |
| 376 | extern String_sort_list_ptr |
| 377 | script_new_string_sort_list(const struct Wildcard_section*); |
| 378 | |
| 379 | /* Add an entry to a list of string and sort entries. */ |
| 380 | |
| 381 | extern String_sort_list_ptr |
| 382 | script_string_sort_list_add(String_sort_list_ptr, |
| 383 | const struct Wildcard_section*); |
| 384 | |
| 385 | /* Create a new list of strings. */ |
| 386 | |
| 387 | extern String_list_ptr |
| 388 | script_new_string_list(const char*, size_t); |
| 389 | |
| 390 | /* Add an element to a list of strings. */ |
| 391 | |
| 392 | extern String_list_ptr |
| 393 | script_string_list_push_back(String_list_ptr, const char*, size_t); |
| 394 | |
| 395 | /* Concatenate two string lists. */ |
| 396 | |
| 397 | extern String_list_ptr |
| 398 | script_string_list_append(String_list_ptr, String_list_ptr); |
| 399 | |
| 400 | /* Define a new program header. */ |
| 401 | |
| 402 | extern void |
| 403 | script_add_phdr(void* closure, const char* name, size_t namelen, |
| 404 | unsigned int type, const struct Phdr_info*); |
| 405 | |
| 406 | /* Convert a program header string to a type. */ |
| 407 | |
| 408 | extern unsigned int |
| 409 | script_phdr_string_to_type(void* closure, const char*, size_t); |
| 410 | |
| 411 | /* Handle DATA_SEGMENT_ALIGN and DATA_SEGMENT_RELRO_END. */ |
| 412 | |
| 413 | extern void |
| 414 | script_data_segment_align(void* closure); |
| 415 | |
| 416 | extern void |
| 417 | script_data_segment_relro_end(void* closure); |
| 418 | |
| 419 | /* Record the fact that a SEGMENT_START expression is seen. */ |
| 420 | |
| 421 | extern void |
| 422 | script_saw_segment_start_expression(void* closure); |
| 423 | |
| 424 | /* Called by the bison parser for MEMORY regions. */ |
| 425 | |
| 426 | extern void |
| 427 | script_add_memory(void*, const char*, size_t, unsigned int, |
| 428 | Expression_ptr, Expression_ptr); |
| 429 | |
| 430 | extern unsigned int |
| 431 | script_parse_memory_attr(void*, const char*, size_t, int); |
| 432 | |
| 433 | extern void |
| 434 | script_set_section_region(void*, const char*, size_t, int); |
| 435 | |
| 436 | extern void |
| 437 | script_include_directive(void *, const char*, size_t); |
| 438 | |
| 439 | /* Called by the bison parser for expressions. */ |
| 440 | |
| 441 | extern Expression_ptr |
| 442 | script_exp_unary_minus(Expression_ptr); |
| 443 | extern Expression_ptr |
| 444 | script_exp_unary_logical_not(Expression_ptr); |
| 445 | extern Expression_ptr |
| 446 | script_exp_unary_bitwise_not(Expression_ptr); |
| 447 | extern Expression_ptr |
| 448 | script_exp_binary_mult(Expression_ptr, Expression_ptr); |
| 449 | extern Expression_ptr |
| 450 | script_exp_binary_div(Expression_ptr, Expression_ptr); |
| 451 | extern Expression_ptr |
| 452 | script_exp_binary_mod(Expression_ptr, Expression_ptr); |
| 453 | extern Expression_ptr |
| 454 | script_exp_binary_add(Expression_ptr, Expression_ptr); |
| 455 | extern Expression_ptr |
| 456 | script_exp_binary_sub(Expression_ptr, Expression_ptr); |
| 457 | extern Expression_ptr |
| 458 | script_exp_binary_lshift(Expression_ptr, Expression_ptr); |
| 459 | extern Expression_ptr |
| 460 | script_exp_binary_rshift(Expression_ptr, Expression_ptr); |
| 461 | extern Expression_ptr |
| 462 | script_exp_binary_eq(Expression_ptr, Expression_ptr); |
| 463 | extern Expression_ptr |
| 464 | script_exp_binary_ne(Expression_ptr, Expression_ptr); |
| 465 | extern Expression_ptr |
| 466 | script_exp_binary_le(Expression_ptr, Expression_ptr); |
| 467 | extern Expression_ptr |
| 468 | script_exp_binary_ge(Expression_ptr, Expression_ptr); |
| 469 | extern Expression_ptr |
| 470 | script_exp_binary_lt(Expression_ptr, Expression_ptr); |
| 471 | extern Expression_ptr |
| 472 | script_exp_binary_gt(Expression_ptr, Expression_ptr); |
| 473 | extern Expression_ptr |
| 474 | script_exp_binary_bitwise_and(Expression_ptr, Expression_ptr); |
| 475 | extern Expression_ptr |
| 476 | script_exp_binary_bitwise_xor(Expression_ptr, Expression_ptr); |
| 477 | extern Expression_ptr |
| 478 | script_exp_binary_bitwise_or(Expression_ptr, Expression_ptr); |
| 479 | extern Expression_ptr |
| 480 | script_exp_binary_logical_and(Expression_ptr, Expression_ptr); |
| 481 | extern Expression_ptr |
| 482 | script_exp_binary_logical_or(Expression_ptr, Expression_ptr); |
| 483 | extern Expression_ptr |
| 484 | script_exp_trinary_cond(Expression_ptr, Expression_ptr, Expression_ptr); |
| 485 | extern Expression_ptr |
| 486 | script_exp_integer(uint64_t); |
| 487 | extern Expression_ptr |
| 488 | script_exp_string(const char*, size_t); |
| 489 | extern Expression_ptr |
| 490 | script_exp_function_max(Expression_ptr, Expression_ptr); |
| 491 | extern Expression_ptr |
| 492 | script_exp_function_min(Expression_ptr, Expression_ptr); |
| 493 | extern Expression_ptr |
| 494 | script_exp_function_defined(const char*, size_t); |
| 495 | extern Expression_ptr |
| 496 | script_exp_function_sizeof_headers(void); |
| 497 | extern Expression_ptr |
| 498 | script_exp_function_alignof(const char*, size_t); |
| 499 | extern Expression_ptr |
| 500 | script_exp_function_sizeof(const char*, size_t); |
| 501 | extern Expression_ptr |
| 502 | script_exp_function_addr(const char*, size_t); |
| 503 | extern Expression_ptr |
| 504 | script_exp_function_loadaddr(const char*, size_t); |
| 505 | extern Expression_ptr |
| 506 | script_exp_function_origin(void*, const char*, size_t); |
| 507 | extern Expression_ptr |
| 508 | script_exp_function_length(void*, const char*, size_t); |
| 509 | extern Expression_ptr |
| 510 | script_exp_function_constant(const char*, size_t); |
| 511 | extern Expression_ptr |
| 512 | script_exp_function_absolute(Expression_ptr); |
| 513 | extern Expression_ptr |
| 514 | script_exp_function_align(Expression_ptr, Expression_ptr); |
| 515 | extern Expression_ptr |
| 516 | script_exp_function_data_segment_align(Expression_ptr, Expression_ptr); |
| 517 | extern Expression_ptr |
| 518 | script_exp_function_data_segment_relro_end(Expression_ptr, Expression_ptr); |
| 519 | extern Expression_ptr |
| 520 | script_exp_function_data_segment_end(Expression_ptr); |
| 521 | extern Expression_ptr |
| 522 | script_exp_function_segment_start(const char*, size_t, Expression_ptr); |
| 523 | extern Expression_ptr |
| 524 | script_exp_function_assert(Expression_ptr, const char*, size_t); |
| 525 | |
| 526 | extern void |
| 527 | script_register_vers_node(void* closure, |
| 528 | const char* tag, |
| 529 | int taglen, |
| 530 | struct Version_tree*, |
| 531 | struct Version_dependency_list*); |
| 532 | |
| 533 | extern struct Version_dependency_list* |
| 534 | script_add_vers_depend(void* closure, |
| 535 | struct Version_dependency_list* existing_dependencies, |
| 536 | const char* depend_to_add, int deplen); |
| 537 | |
| 538 | extern struct Version_expression_list* |
| 539 | script_new_vers_pattern(void* closure, |
| 540 | struct Version_expression_list*, |
| 541 | const char*, int, int); |
| 542 | |
| 543 | extern struct Version_expression_list* |
| 544 | script_merge_expressions(struct Version_expression_list* a, |
| 545 | struct Version_expression_list* b); |
| 546 | |
| 547 | extern struct Version_tree* |
| 548 | script_new_vers_node(void* closure, |
| 549 | struct Version_expression_list* global, |
| 550 | struct Version_expression_list* local); |
| 551 | |
| 552 | extern void |
| 553 | version_script_push_lang(void* closure, const char* lang, int langlen); |
| 554 | |
| 555 | extern void |
| 556 | version_script_pop_lang(void* closure); |
| 557 | |
| 558 | #ifdef __cplusplus |
| 559 | } // End extern "C" |
| 560 | #endif |
| 561 | |
| 562 | #ifdef __cplusplus |
| 563 | } // End namespace gold. |
| 564 | #endif |
| 565 | |
| 566 | #endif /* !defined(GOLD_SCRIPT_C_H) */ |