gold/script-c.h

   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
  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   SORT_WILDCARD_BY_INIT_PRIORITY
 144 };
 145
 146 /* The information we build for a single wildcard specification.  */
 147
 148 struct 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
 159 typedef std::vector<Wildcard_section> String_sort_list;
 160 typedef String_sort_list* String_sort_list_ptr;
 161 #else
 162 typedef void* String_sort_list_ptr;
 163 #endif
 164
 165 /* A list of wildcard specifications, which may include EXCLUDE_FILE
 166    clauses.  */
 167
 168 struct 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
 178 struct 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
 188 struct 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
 202 struct Version_dependency_list;
 203 struct Version_expression_list;
 204 struct Version_tree;
 205
 206 #ifdef __cplusplus
 207 extern "C" {
 208 #endif
 209
 210 /* The bison parser definitions.  */
 211
 212 #include "yyscript.h"
 213
 214 /* The bison parser function.  */
 215
 216 extern int
 217 yyparse(void* closure);
 218
 219 /* Called by the bison parser skeleton to return the next token.  */
 220
 221 extern int
 222 yylex(YYSTYPE*, void* closure);
 223
 224 /* Called by the bison parser skeleton to report an error.  */
 225
 226 extern void
 227 yyerror(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
 232 extern void
 233 script_add_extern(void* closure, const char*, size_t);
 234
 235 /* Called by the bison parser to add a file to the link.  */
 236
 237 extern void
 238 script_add_file(void* closure, const char*, size_t);
 239
 240 /* Called by the bison parser to add a library to the link.  */
 241
 242 extern void
 243 script_add_library(void* closure, const char*, size_t);
 244
 245 /* Called by the bison parser to start and stop a group.  */
 246
 247 extern void
 248 script_start_group(void* closure);
 249 extern void
 250 script_end_group(void* closure);
 251
 252 /* Called by the bison parser to start and end an AS_NEEDED list.  */
 253
 254 extern void
 255 script_start_as_needed(void* closure);
 256 extern void
 257 script_end_as_needed(void* closure);
 258
 259 /* Called by the bison parser to set the entry symbol.  */
 260
 261 extern void
 262 script_set_entry(void* closure, const char*, size_t);
 263
 264 /* Called by the bison parser to set whether to define common symbols.  */
 265
 266 extern void
 267 script_set_common_allocation(void* closure, int);
 268
 269 /* Called by the bison parser to parse an OPTION.  */
 270
 271 extern void
 272 script_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
 277 extern int
 278 script_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.  */
 282 extern void
 283 script_set_target(void* closure, const char*, size_t);
 284
 285 /* Called by the bison parser to handle SEARCH_DIR.  */
 286
 287 extern void
 288 script_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
 293 extern void
 294 script_push_lex_into_expression_mode(void* closure);
 295
 296 /* Called by the bison parser to push the lexer into version
 297    mode.  */
 298
 299 extern void
 300 script_push_lex_into_version_mode(void* closure);
 301
 302 /* Called by the bison parser to pop the lexer mode.  */
 303
 304 extern void
 305 script_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
 312 extern Expression_ptr
 313 script_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
 320 extern void
 321 script_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
 326 extern void
 327 script_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
 332 extern void
 333 script_start_sections(void* closure);
 334
 335 /* Called by the bison parser to finish a SECTIONS clause.  */
 336
 337 extern void
 338 script_finish_sections(void* closure);
 339
 340 /* Called by the bison parser to start handling input section
 341    specifications for an output section.  */
 342
 343 extern void
 344 script_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
 350 extern void
 351 script_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
 357 extern void
 358 script_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
 363 extern void
 364 script_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
 371 extern void
 372 script_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
 377 extern String_sort_list_ptr
 378 script_new_string_sort_list(const struct Wildcard_section*);
 379
 380 /* Add an entry to a list of string and sort entries.  */
 381
 382 extern String_sort_list_ptr
 383 script_string_sort_list_add(String_sort_list_ptr,
 384                             const struct Wildcard_section*);
 385
 386 /* Create a new list of strings.  */
 387
 388 extern String_list_ptr
 389 script_new_string_list(const char*, size_t);
 390
 391 /* Add an element to a list of strings.  */
 392
 393 extern String_list_ptr
 394 script_string_list_push_back(String_list_ptr, const char*, size_t);
 395
 396 /* Concatenate two string lists.  */
 397
 398 extern String_list_ptr
 399 script_string_list_append(String_list_ptr, String_list_ptr);
 400
 401 /* Define a new program header.  */
 402
 403 extern void
 404 script_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
 409 extern unsigned int
 410 script_phdr_string_to_type(void* closure, const char*, size_t);
 411
 412 /* Handle DATA_SEGMENT_ALIGN and DATA_SEGMENT_RELRO_END.  */
 413
 414 extern void
 415 script_data_segment_align(void* closure);
 416
 417 extern void
 418 script_data_segment_relro_end(void* closure);
 419
 420 /* Record the fact that a SEGMENT_START expression is seen.  */
 421
 422 extern void
 423 script_saw_segment_start_expression(void* closure);
 424
 425 /* Called by the bison parser for MEMORY regions.  */
 426
 427 extern void
 428 script_add_memory(void*, const char*, size_t, unsigned int,
 429                   Expression_ptr, Expression_ptr);
 430
 431 extern unsigned int
 432 script_parse_memory_attr(void*, const char*, size_t, int);
 433
 434 extern void
 435 script_set_section_region(void*, const char*, size_t, int);
 436
 437 extern void
 438 script_include_directive(int, void *, const char*, size_t);
 439
 440 /* Called by the bison parser for expressions.  */
 441
 442 extern Expression_ptr
 443 script_exp_unary_minus(Expression_ptr);
 444 extern Expression_ptr
 445 script_exp_unary_logical_not(Expression_ptr);
 446 extern Expression_ptr
 447 script_exp_unary_bitwise_not(Expression_ptr);
 448 extern Expression_ptr
 449 script_exp_binary_mult(Expression_ptr, Expression_ptr);
 450 extern Expression_ptr
 451 script_exp_binary_div(Expression_ptr, Expression_ptr);
 452 extern Expression_ptr
 453 script_exp_binary_mod(Expression_ptr, Expression_ptr);
 454 extern Expression_ptr
 455 script_exp_binary_add(Expression_ptr, Expression_ptr);
 456 extern Expression_ptr
 457 script_exp_binary_sub(Expression_ptr, Expression_ptr);
 458 extern Expression_ptr
 459 script_exp_binary_lshift(Expression_ptr, Expression_ptr);
 460 extern Expression_ptr
 461 script_exp_binary_rshift(Expression_ptr, Expression_ptr);
 462 extern Expression_ptr
 463 script_exp_binary_eq(Expression_ptr, Expression_ptr);
 464 extern Expression_ptr
 465 script_exp_binary_ne(Expression_ptr, Expression_ptr);
 466 extern Expression_ptr
 467 script_exp_binary_le(Expression_ptr, Expression_ptr);
 468 extern Expression_ptr
 469 script_exp_binary_ge(Expression_ptr, Expression_ptr);
 470 extern Expression_ptr
 471 script_exp_binary_lt(Expression_ptr, Expression_ptr);
 472 extern Expression_ptr
 473 script_exp_binary_gt(Expression_ptr, Expression_ptr);
 474 extern Expression_ptr
 475 script_exp_binary_bitwise_and(Expression_ptr, Expression_ptr);
 476 extern Expression_ptr
 477 script_exp_binary_bitwise_xor(Expression_ptr, Expression_ptr);
 478 extern Expression_ptr
 479 script_exp_binary_bitwise_or(Expression_ptr, Expression_ptr);
 480 extern Expression_ptr
 481 script_exp_binary_logical_and(Expression_ptr, Expression_ptr);
 482 extern Expression_ptr
 483 script_exp_binary_logical_or(Expression_ptr, Expression_ptr);
 484 extern Expression_ptr
 485 script_exp_trinary_cond(Expression_ptr, Expression_ptr, Expression_ptr);
 486 extern Expression_ptr
 487 script_exp_integer(uint64_t);
 488 extern Expression_ptr
 489 script_exp_string(const char*, size_t);
 490 extern Expression_ptr
 491 script_exp_function_max(Expression_ptr, Expression_ptr);
 492 extern Expression_ptr
 493 script_exp_function_min(Expression_ptr, Expression_ptr);
 494 extern Expression_ptr
 495 script_exp_function_defined(const char*, size_t);
 496 extern Expression_ptr
 497 script_exp_function_sizeof_headers(void);
 498 extern Expression_ptr
 499 script_exp_function_alignof(const char*, size_t);
 500 extern Expression_ptr
 501 script_exp_function_sizeof(const char*, size_t);
 502 extern Expression_ptr
 503 script_exp_function_addr(const char*, size_t);
 504 extern Expression_ptr
 505 script_exp_function_loadaddr(const char*, size_t);
 506 extern Expression_ptr
 507 script_exp_function_origin(void*, const char*, size_t);
 508 extern Expression_ptr
 509 script_exp_function_length(void*, const char*, size_t);
 510 extern Expression_ptr
 511 script_exp_function_constant(const char*, size_t);
 512 extern Expression_ptr
 513 script_exp_function_absolute(Expression_ptr);
 514 extern Expression_ptr
 515 script_exp_function_align(Expression_ptr, Expression_ptr);
 516 extern Expression_ptr
 517 script_exp_function_data_segment_align(Expression_ptr, Expression_ptr);
 518 extern Expression_ptr
 519 script_exp_function_data_segment_relro_end(Expression_ptr, Expression_ptr);
 520 extern Expression_ptr
 521 script_exp_function_data_segment_end(Expression_ptr);
 522 extern Expression_ptr
 523 script_exp_function_segment_start(const char*, size_t, Expression_ptr);
 524 extern Expression_ptr
 525 script_exp_function_assert(Expression_ptr, const char*, size_t);
 526
 527 extern void
 528 script_register_vers_node(void* closure,
 529                           const char* tag,
 530                           int taglen,
 531                           struct Version_tree*,
 532                           struct Version_dependency_list*);
 533
 534 extern struct Version_dependency_list*
 535 script_add_vers_depend(void* closure,
 536                        struct Version_dependency_list* existing_dependencies,
 537                        const char* depend_to_add, int deplen);
 538
 539 extern struct Version_expression_list*
 540 script_new_vers_pattern(void* closure,
 541                         struct Version_expression_list*,
 542                         const char*, int, int);
 543
 544 extern struct Version_expression_list*
 545 script_merge_expressions(struct Version_expression_list* a,
 546                          struct Version_expression_list* b);
 547
 548 extern struct Version_tree*
 549 script_new_vers_node(void* closure,
 550                      struct Version_expression_list* global,
 551                      struct Version_expression_list* local);
 552
 553 extern void
 554 version_script_push_lang(void* closure, const char* lang, int langlen);
 555
 556 extern void
 557 version_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) */