gold/script-c.h

   1 /* script-c.h -- C interface for linker scripts in gold.  */
   2
   3 /* Copyright 2006, 2007, 2008 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 expressions.  */
 425
 426 extern Expression_ptr
 427 script_exp_unary_minus(Expression_ptr);
 428 extern Expression_ptr
 429 script_exp_unary_logical_not(Expression_ptr);
 430 extern Expression_ptr
 431 script_exp_unary_bitwise_not(Expression_ptr);
 432 extern Expression_ptr
 433 script_exp_binary_mult(Expression_ptr, Expression_ptr);
 434 extern Expression_ptr
 435 script_exp_binary_div(Expression_ptr, Expression_ptr);
 436 extern Expression_ptr
 437 script_exp_binary_mod(Expression_ptr, Expression_ptr);
 438 extern Expression_ptr
 439 script_exp_binary_add(Expression_ptr, Expression_ptr);
 440 extern Expression_ptr
 441 script_exp_binary_sub(Expression_ptr, Expression_ptr);
 442 extern Expression_ptr
 443 script_exp_binary_lshift(Expression_ptr, Expression_ptr);
 444 extern Expression_ptr
 445 script_exp_binary_rshift(Expression_ptr, Expression_ptr);
 446 extern Expression_ptr
 447 script_exp_binary_eq(Expression_ptr, Expression_ptr);
 448 extern Expression_ptr
 449 script_exp_binary_ne(Expression_ptr, Expression_ptr);
 450 extern Expression_ptr
 451 script_exp_binary_le(Expression_ptr, Expression_ptr);
 452 extern Expression_ptr
 453 script_exp_binary_ge(Expression_ptr, Expression_ptr);
 454 extern Expression_ptr
 455 script_exp_binary_lt(Expression_ptr, Expression_ptr);
 456 extern Expression_ptr
 457 script_exp_binary_gt(Expression_ptr, Expression_ptr);
 458 extern Expression_ptr
 459 script_exp_binary_bitwise_and(Expression_ptr, Expression_ptr);
 460 extern Expression_ptr
 461 script_exp_binary_bitwise_xor(Expression_ptr, Expression_ptr);
 462 extern Expression_ptr
 463 script_exp_binary_bitwise_or(Expression_ptr, Expression_ptr);
 464 extern Expression_ptr
 465 script_exp_binary_logical_and(Expression_ptr, Expression_ptr);
 466 extern Expression_ptr
 467 script_exp_binary_logical_or(Expression_ptr, Expression_ptr);
 468 extern Expression_ptr
 469 script_exp_trinary_cond(Expression_ptr, Expression_ptr, Expression_ptr);
 470 extern Expression_ptr
 471 script_exp_integer(uint64_t);
 472 extern Expression_ptr
 473 script_exp_string(const char*, size_t);
 474 extern Expression_ptr
 475 script_exp_function_max(Expression_ptr, Expression_ptr);
 476 extern Expression_ptr
 477 script_exp_function_min(Expression_ptr, Expression_ptr);
 478 extern Expression_ptr
 479 script_exp_function_defined(const char*, size_t);
 480 extern Expression_ptr
 481 script_exp_function_sizeof_headers(void);
 482 extern Expression_ptr
 483 script_exp_function_alignof(const char*, size_t);
 484 extern Expression_ptr
 485 script_exp_function_sizeof(const char*, size_t);
 486 extern Expression_ptr
 487 script_exp_function_addr(const char*, size_t);
 488 extern Expression_ptr
 489 script_exp_function_loadaddr(const char*, size_t);
 490 extern Expression_ptr
 491 script_exp_function_origin(const char*, size_t);
 492 extern Expression_ptr
 493 script_exp_function_length(const char*, size_t);
 494 extern Expression_ptr
 495 script_exp_function_constant(const char*, size_t);
 496 extern Expression_ptr
 497 script_exp_function_absolute(Expression_ptr);
 498 extern Expression_ptr
 499 script_exp_function_align(Expression_ptr, Expression_ptr);
 500 extern Expression_ptr
 501 script_exp_function_data_segment_align(Expression_ptr, Expression_ptr);
 502 extern Expression_ptr
 503 script_exp_function_data_segment_relro_end(Expression_ptr, Expression_ptr);
 504 extern Expression_ptr
 505 script_exp_function_data_segment_end(Expression_ptr);
 506 extern Expression_ptr
 507 script_exp_function_segment_start(const char*, size_t, Expression_ptr);
 508 extern Expression_ptr
 509 script_exp_function_assert(Expression_ptr, const char*, size_t);
 510
 511 extern void
 512 script_register_vers_node(void* closure,
 513                           const char* tag,
 514                           int taglen,
 515                           struct Version_tree*,
 516                           struct Version_dependency_list*);
 517
 518 extern struct Version_dependency_list*
 519 script_add_vers_depend(void* closure,
 520                        struct Version_dependency_list* existing_dependencies,
 521                        const char* depend_to_add, int deplen);
 522
 523 extern struct Version_expression_list*
 524 script_new_vers_pattern(void* closure,
 525                         struct Version_expression_list*,
 526                         const char*, int, int);
 527
 528 extern struct Version_expression_list*
 529 script_merge_expressions(struct Version_expression_list* a,
 530                          struct Version_expression_list* b);
 531
 532 extern struct Version_tree*
 533 script_new_vers_node(void* closure,
 534                      struct Version_expression_list* global,
 535                      struct Version_expression_list* local);
 536
 537 extern void
 538 version_script_push_lang(void* closure, const char* lang, int langlen);
 539
 540 extern void
 541 version_script_pop_lang(void* closure);
 542
 543 #ifdef __cplusplus
 544 } // End extern "C"
 545 #endif
 546
 547 #ifdef __cplusplus
 548 } // End namespace gold.
 549 #endif
 550
 551 #endif /* !defined(GOLD_SCRIPT_C_H) */