1/* script-c.h -- C interface for linker scripts in gold. */ 2 3/* Copyright (C) 2006-2020 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 40namespace gold 41{ 42#endif 43 44/* A string value for the bison parser. */ 45 46struct 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 58class Expression; 59typedef Expression* Expression_ptr; 60#else 61typedef void* Expression_ptr; 62#endif 63 64/* Script_section type. */ 65enum 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 79enum 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 94struct 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 116typedef std::vector<std::string> String_list; 117typedef String_list* String_list_ptr; 118#else 119typedef void* String_list_ptr; 120#endif 121 122/* The information we store for an output section trailer in the bison 123 parser. */ 124 125struct 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 136enum 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 SORT_WILDCARD_BY_INIT_PRIORITY 144}; 145 146/* The information we build for a single wildcard specification. */ 147 148struct Wildcard_section 149{ 150 /* The wildcard spec itself. */ 151 struct Parser_string name; 152 /* How the entries should be sorted. */ 153 enum Sort_wildcard sort; 154}; 155 156/* A vector of Wildcard_section entries. */ 157 158#ifdef __cplusplus 159typedef std::vector<Wildcard_section> String_sort_list; 160typedef String_sort_list* String_sort_list_ptr; 161#else 162typedef void* String_sort_list_ptr; 163#endif 164 165/* A list of wildcard specifications, which may include EXCLUDE_FILE 166 clauses. */ 167 168struct Wildcard_sections 169{ 170 /* Wildcard specs. */ 171 String_sort_list_ptr sections; 172 /* Exclusions. */ 173 String_list_ptr exclude; 174}; 175 176/* A complete input section specification. */ 177 178struct Input_section_spec 179{ 180 /* The file name. */ 181 struct Wildcard_section file; 182 /* The list of sections. */ 183 struct Wildcard_sections input_sections; 184}; 185 186/* Information for a program header. */ 187 188struct Phdr_info 189{ 190 /* A boolean value: whether to include the file header. */ 191 int includes_filehdr; 192 /* A boolean value: whether to include the program headers. */ 193 int includes_phdrs; 194 /* A boolean value: whether the flags field is valid. */ 195 int is_flags_valid; 196 /* The value to use for the flags. */ 197 unsigned int flags; 198 /* The load address. */ 199 Expression_ptr load_address; 200}; 201 202struct Version_dependency_list; 203struct Version_expression_list; 204struct Version_tree; 205 206#ifdef __cplusplus 207extern "C" { 208#endif 209 210/* The bison parser definitions. */ 211 212#include "yyscript.h" 213 214/* The bison parser function. */ 215 216extern int 217yyparse(void* closure); 218 219/* Called by the bison parser skeleton to return the next token. */ 220 221extern int 222yylex(YYSTYPE*, void* closure); 223 224/* Called by the bison parser skeleton to report an error. */ 225 226extern void 227yyerror(void* closure, const char*); 228 229/* Called by the bison parser to add an external symbol (a symbol in 230 an EXTERN declaration) to the link. */ 231 232extern void 233script_add_extern(void* closure, const char*, size_t); 234 235/* Called by the bison parser to add a file to the link. */ 236 237extern void 238script_add_file(void* closure, const char*, size_t); 239 240/* Called by the bison parser to add a library to the link. */ 241 242extern void 243script_add_library(void* closure, const char*, size_t); 244 245/* Called by the bison parser to start and stop a group. */ 246 247extern void 248script_start_group(void* closure); 249extern void 250script_end_group(void* closure); 251 252/* Called by the bison parser to start and end an AS_NEEDED list. */ 253 254extern void 255script_start_as_needed(void* closure); 256extern void 257script_end_as_needed(void* closure); 258 259/* Called by the bison parser to set the entry symbol. */ 260 261extern void 262script_set_entry(void* closure, const char*, size_t); 263 264/* Called by the bison parser to set whether to define common symbols. */ 265 266extern void 267script_set_common_allocation(void* closure, int); 268 269/* Called by the bison parser to parse an OPTION. */ 270 271extern void 272script_parse_option(void* closure, const char*, size_t); 273 274/* Called by the bison parser to handle OUTPUT_FORMAT. This return 0 275 if the parse should be aborted. */ 276 277extern int 278script_check_output_format(void* closure, const char*, size_t, 279 const char*, size_t, const char*, size_t); 280 281/* Called by the bison parser to handle TARGET. */ 282extern void 283script_set_target(void* closure, const char*, size_t); 284 285/* Called by the bison parser to handle SEARCH_DIR. */ 286 287extern void 288script_add_search_dir(void* closure, const char*, size_t); 289 290/* Called by the bison parser to push the lexer into expression 291 mode. */ 292 293extern void 294script_push_lex_into_expression_mode(void* closure); 295 296/* Called by the bison parser to push the lexer into version 297 mode. */ 298 299extern void 300script_push_lex_into_version_mode(void* closure); 301 302/* Called by the bison parser to pop the lexer mode. */ 303 304extern void 305script_pop_lex_mode(void* closure); 306 307/* Called by the bison parser to get the value of a symbol. This is 308 called for a reference to a symbol, but is not called for something 309 like "sym += 10". Uses of the special symbol "." can just call 310 script_exp_string. */ 311 312extern Expression_ptr 313script_symbol(void* closure, const char*, size_t); 314 315/* Called by the bison parser to set a symbol to a value. PROVIDE is 316 non-zero if the symbol should be provided--only defined if there is 317 an undefined reference. HIDDEN is non-zero if the symbol should be 318 hidden. */ 319 320extern void 321script_set_symbol(void* closure, const char*, size_t, Expression_ptr, 322 int provide, int hidden); 323 324/* Called by the bison parser to add an assertion. */ 325 326extern void 327script_add_assertion(void* closure, Expression_ptr, const char* message, 328 size_t messagelen); 329 330/* Called by the bison parser to start a SECTIONS clause. */ 331 332extern void 333script_start_sections(void* closure); 334 335/* Called by the bison parser to finish a SECTIONS clause. */ 336 337extern void 338script_finish_sections(void* closure); 339 340/* Called by the bison parser to start handling input section 341 specifications for an output section. */ 342 343extern void 344script_start_output_section(void* closure, const char* name, size_t namelen, 345 const struct Parser_output_section_header*); 346 347/* Called by the bison parser when done handling input section 348 specifications for an output section. */ 349 350extern void 351script_finish_output_section(void* closure, 352 const struct Parser_output_section_trailer*); 353 354/* Called by the bison parser to handle a data statement (LONG, BYTE, 355 etc.) in an output section. */ 356 357extern void 358script_add_data(void* closure, int data_token, Expression_ptr val); 359 360/* Called by the bison parser to set the fill value in an output 361 section. */ 362 363extern void 364script_add_fill(void* closure, Expression_ptr val); 365 366/* Called by the bison parser to add an input section specification to 367 an output section. The KEEP parameter is non-zero if this is 368 within a KEEP clause, meaning that the garbage collector should not 369 discard it. */ 370 371extern void 372script_add_input_section(void* closure, const struct Input_section_spec*, 373 int keep); 374 375/* Create a new list of string and sort entries. */ 376 377extern String_sort_list_ptr 378script_new_string_sort_list(const struct Wildcard_section*); 379 380/* Add an entry to a list of string and sort entries. */ 381 382extern String_sort_list_ptr 383script_string_sort_list_add(String_sort_list_ptr, 384 const struct Wildcard_section*); 385 386/* Create a new list of strings. */ 387 388extern String_list_ptr 389script_new_string_list(const char*, size_t); 390 391/* Add an element to a list of strings. */ 392 393extern String_list_ptr 394script_string_list_push_back(String_list_ptr, const char*, size_t); 395 396/* Concatenate two string lists. */ 397 398extern String_list_ptr 399script_string_list_append(String_list_ptr, String_list_ptr); 400 401/* Define a new program header. */ 402 403extern void 404script_add_phdr(void* closure, const char* name, size_t namelen, 405 unsigned int type, const struct Phdr_info*); 406 407/* Convert a program header string to a type. */ 408 409extern unsigned int 410script_phdr_string_to_type(void* closure, const char*, size_t); 411 412/* Handle DATA_SEGMENT_ALIGN and DATA_SEGMENT_RELRO_END. */ 413 414extern void 415script_data_segment_align(void* closure); 416 417extern void 418script_data_segment_relro_end(void* closure); 419 420/* Record the fact that a SEGMENT_START expression is seen. */ 421 422extern void 423script_saw_segment_start_expression(void* closure); 424 425/* Called by the bison parser for MEMORY regions. */ 426 427extern void 428script_add_memory(void*, const char*, size_t, unsigned int, 429 Expression_ptr, Expression_ptr); 430 431extern unsigned int 432script_parse_memory_attr(void*, const char*, size_t, int); 433 434extern void 435script_set_section_region(void*, const char*, size_t, int); 436 437extern void 438script_include_directive(int, void *, const char*, size_t); 439 440/* Called by the bison parser for expressions. */ 441 442extern Expression_ptr 443script_exp_unary_minus(Expression_ptr); 444extern Expression_ptr 445script_exp_unary_logical_not(Expression_ptr); 446extern Expression_ptr 447script_exp_unary_bitwise_not(Expression_ptr); 448extern Expression_ptr 449script_exp_binary_mult(Expression_ptr, Expression_ptr); 450extern Expression_ptr 451script_exp_binary_div(Expression_ptr, Expression_ptr); 452extern Expression_ptr 453script_exp_binary_mod(Expression_ptr, Expression_ptr); 454extern Expression_ptr 455script_exp_binary_add(Expression_ptr, Expression_ptr); 456extern Expression_ptr 457script_exp_binary_sub(Expression_ptr, Expression_ptr); 458extern Expression_ptr 459script_exp_binary_lshift(Expression_ptr, Expression_ptr); 460extern Expression_ptr 461script_exp_binary_rshift(Expression_ptr, Expression_ptr); 462extern Expression_ptr 463script_exp_binary_eq(Expression_ptr, Expression_ptr); 464extern Expression_ptr 465script_exp_binary_ne(Expression_ptr, Expression_ptr); 466extern Expression_ptr 467script_exp_binary_le(Expression_ptr, Expression_ptr); 468extern Expression_ptr 469script_exp_binary_ge(Expression_ptr, Expression_ptr); 470extern Expression_ptr 471script_exp_binary_lt(Expression_ptr, Expression_ptr); 472extern Expression_ptr 473script_exp_binary_gt(Expression_ptr, Expression_ptr); 474extern Expression_ptr 475script_exp_binary_bitwise_and(Expression_ptr, Expression_ptr); 476extern Expression_ptr 477script_exp_binary_bitwise_xor(Expression_ptr, Expression_ptr); 478extern Expression_ptr 479script_exp_binary_bitwise_or(Expression_ptr, Expression_ptr); 480extern Expression_ptr 481script_exp_binary_logical_and(Expression_ptr, Expression_ptr); 482extern Expression_ptr 483script_exp_binary_logical_or(Expression_ptr, Expression_ptr); 484extern Expression_ptr 485script_exp_trinary_cond(Expression_ptr, Expression_ptr, Expression_ptr); 486extern Expression_ptr 487script_exp_integer(uint64_t); 488extern Expression_ptr 489script_exp_string(const char*, size_t); 490extern Expression_ptr 491script_exp_function_max(Expression_ptr, Expression_ptr); 492extern Expression_ptr 493script_exp_function_min(Expression_ptr, Expression_ptr); 494extern Expression_ptr 495script_exp_function_defined(const char*, size_t); 496extern Expression_ptr 497script_exp_function_sizeof_headers(void); 498extern Expression_ptr 499script_exp_function_alignof(const char*, size_t); 500extern Expression_ptr 501script_exp_function_sizeof(const char*, size_t); 502extern Expression_ptr 503script_exp_function_addr(const char*, size_t); 504extern Expression_ptr 505script_exp_function_loadaddr(const char*, size_t); 506extern Expression_ptr 507script_exp_function_origin(void*, const char*, size_t); 508extern Expression_ptr 509script_exp_function_length(void*, const char*, size_t); 510extern Expression_ptr 511script_exp_function_constant(const char*, size_t); 512extern Expression_ptr 513script_exp_function_absolute(Expression_ptr); 514extern Expression_ptr 515script_exp_function_align(Expression_ptr, Expression_ptr); 516extern Expression_ptr 517script_exp_function_data_segment_align(Expression_ptr, Expression_ptr); 518extern Expression_ptr 519script_exp_function_data_segment_relro_end(Expression_ptr, Expression_ptr); 520extern Expression_ptr 521script_exp_function_data_segment_end(Expression_ptr); 522extern Expression_ptr 523script_exp_function_segment_start(const char*, size_t, Expression_ptr); 524extern Expression_ptr 525script_exp_function_assert(Expression_ptr, const char*, size_t); 526 527extern void 528script_register_vers_node(void* closure, 529 const char* tag, 530 int taglen, 531 struct Version_tree*, 532 struct Version_dependency_list*); 533 534extern struct Version_dependency_list* 535script_add_vers_depend(void* closure, 536 struct Version_dependency_list* existing_dependencies, 537 const char* depend_to_add, int deplen); 538 539extern struct Version_expression_list* 540script_new_vers_pattern(void* closure, 541 struct Version_expression_list*, 542 const char*, int, int); 543 544extern struct Version_expression_list* 545script_merge_expressions(struct Version_expression_list* a, 546 struct Version_expression_list* b); 547 548extern struct Version_tree* 549script_new_vers_node(void* closure, 550 struct Version_expression_list* global, 551 struct Version_expression_list* local); 552 553extern void 554version_script_push_lang(void* closure, const char* lang, int langlen); 555 556extern void 557version_script_pop_lang(void* closure); 558 559#ifdef __cplusplus 560} // End extern "C" 561#endif 562 563#ifdef __cplusplus 564} // End namespace gold. 565#endif 566 567#endif /* !defined(GOLD_SCRIPT_C_H) */ 568