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 start and stop a group.  */
 240
 241 extern void
 242 script_start_group(void* closure);
 243 extern void
 244 script_end_group(void* closure);
 245
 246 /* Called by the bison parser to start and end an AS_NEEDED list.  */
 247
 248 extern void
 249 script_start_as_needed(void* closure);
 250 extern void
 251 script_end_as_needed(void* closure);
 252
 253 /* Called by the bison parser to set the entry symbol.  */
 254
 255 extern void
 256 script_set_entry(void* closure, const char*, size_t);
 257
 258 /* Called by the bison parser to set whether to define common symbols.  */
 259
 260 extern void
 261 script_set_common_allocation(void* closure, int);
 262
 263 /* Called by the bison parser to parse an OPTION.  */
 264
 265 extern void
 266 script_parse_option(void* closure, const char*, size_t);
 267
 268 /* Called by the bison parser to handle OUTPUT_FORMAT.  This return 0
 269    if the parse should be aborted.  */
 270
 271 extern int
 272 script_check_output_format(void* closure, const char*, size_t,
 273                            const char*, size_t, const char*, size_t);
 274
 275 /* Called by the bison parser to handle TARGET.  */
 276 extern void
 277 script_set_target(void* closure, const char*, size_t);
 278
 279 /* Called by the bison parser to handle SEARCH_DIR.  */
 280
 281 extern void
 282 script_add_search_dir(void* closure, const char*, size_t);
 283
 284 /* Called by the bison parser to push the lexer into expression
 285    mode.  */
 286
 287 extern void
 288 script_push_lex_into_expression_mode(void* closure);
 289
 290 /* Called by the bison parser to push the lexer into version
 291    mode.  */
 292
 293 extern void
 294 script_push_lex_into_version_mode(void* closure);
 295
 296 /* Called by the bison parser to pop the lexer mode.  */
 297
 298 extern void
 299 script_pop_lex_mode(void* closure);
 300
 301 /* Called by the bison parser to set a symbol to a value.  PROVIDE is
 302    non-zero if the symbol should be provided--only defined if there is
 303    an undefined reference.  HIDDEN is non-zero if the symbol should be
 304    hidden.  */
 305
 306 extern void
 307 script_set_symbol(void* closure, const char*, size_t, Expression_ptr,
 308                   int provide, int hidden);
 309
 310 /* Called by the bison parser to add an assertion.  */
 311
 312 extern void
 313 script_add_assertion(void* closure, Expression_ptr, const char* message,
 314                      size_t messagelen);
 315
 316 /* Called by the bison parser to start a SECTIONS clause.  */
 317
 318 extern void
 319 script_start_sections(void* closure);
 320
 321 /* Called by the bison parser to finish a SECTIONS clause.  */
 322
 323 extern void
 324 script_finish_sections(void* closure);
 325
 326 /* Called by the bison parser to start handling input section
 327    specifications for an output section.  */
 328
 329 extern void
 330 script_start_output_section(void* closure, const char* name, size_t namelen,
 331                             const struct Parser_output_section_header*);
 332
 333 /* Called by the bison parser when done handling input section
 334    specifications for an output section.  */
 335
 336 extern void
 337 script_finish_output_section(void* closure,
 338                              const struct Parser_output_section_trailer*);
 339
 340 /* Called by the bison parser to handle a data statement (LONG, BYTE,
 341    etc.) in an output section.  */
 342
 343 extern void
 344 script_add_data(void* closure, int data_token, Expression_ptr val);
 345
 346 /* Called by the bison parser to set the fill value in an output
 347    section.  */
 348
 349 extern void
 350 script_add_fill(void* closure, Expression_ptr val);
 351
 352 /* Called by the bison parser to add an input section specification to
 353    an output section.  The KEEP parameter is non-zero if this is
 354    within a KEEP clause, meaning that the garbage collector should not
 355    discard it.  */
 356
 357 extern void
 358 script_add_input_section(void* closure, const struct Input_section_spec*,
 359                          int keep);
 360
 361 /* Create a new list of string and sort entries.  */
 362
 363 extern String_sort_list_ptr
 364 script_new_string_sort_list(const struct Wildcard_section*);
 365
 366 /* Add an entry to a list of string and sort entries.  */
 367
 368 extern String_sort_list_ptr
 369 script_string_sort_list_add(String_sort_list_ptr,
 370                             const struct Wildcard_section*);
 371
 372 /* Create a new list of strings.  */
 373
 374 extern String_list_ptr
 375 script_new_string_list(const char*, size_t);
 376
 377 /* Add an element to a list of strings.  */
 378
 379 extern String_list_ptr
 380 script_string_list_push_back(String_list_ptr, const char*, size_t);
 381
 382 /* Concatenate two string lists.  */
 383
 384 extern String_list_ptr
 385 script_string_list_append(String_list_ptr, String_list_ptr);
 386
 387 /* Define a new program header.  */
 388
 389 extern void
 390 script_add_phdr(void* closure, const char* name, size_t namelen,
 391                 unsigned int type, const struct Phdr_info*);
 392
 393 /* Convert a program header string to a type.  */
 394
 395 extern unsigned int
 396 script_phdr_string_to_type(void* closure, const char*, size_t);
 397
 398 /* Handle DATA_SEGMENT_ALIGN and DATA_SEGMENT_RELRO_END.  */
 399
 400 extern void
 401 script_data_segment_align(void* closure);
 402
 403 extern void
 404 script_data_segment_relro_end(void* closure);
 405
 406 /* Record the fact that a SEGMENT_START expression is seen.  */
 407
 408 extern void
 409 script_saw_segment_start_expression(void* closure);
 410
 411 /* Called by the bison parser for expressions.  */
 412
 413 extern Expression_ptr
 414 script_exp_unary_minus(Expression_ptr);
 415 extern Expression_ptr
 416 script_exp_unary_logical_not(Expression_ptr);
 417 extern Expression_ptr
 418 script_exp_unary_bitwise_not(Expression_ptr);
 419 extern Expression_ptr
 420 script_exp_binary_mult(Expression_ptr, Expression_ptr);
 421 extern Expression_ptr
 422 script_exp_binary_div(Expression_ptr, Expression_ptr);
 423 extern Expression_ptr
 424 script_exp_binary_mod(Expression_ptr, Expression_ptr);
 425 extern Expression_ptr
 426 script_exp_binary_add(Expression_ptr, Expression_ptr);
 427 extern Expression_ptr
 428 script_exp_binary_sub(Expression_ptr, Expression_ptr);
 429 extern Expression_ptr
 430 script_exp_binary_lshift(Expression_ptr, Expression_ptr);
 431 extern Expression_ptr
 432 script_exp_binary_rshift(Expression_ptr, Expression_ptr);
 433 extern Expression_ptr
 434 script_exp_binary_eq(Expression_ptr, Expression_ptr);
 435 extern Expression_ptr
 436 script_exp_binary_ne(Expression_ptr, Expression_ptr);
 437 extern Expression_ptr
 438 script_exp_binary_le(Expression_ptr, Expression_ptr);
 439 extern Expression_ptr
 440 script_exp_binary_ge(Expression_ptr, Expression_ptr);
 441 extern Expression_ptr
 442 script_exp_binary_lt(Expression_ptr, Expression_ptr);
 443 extern Expression_ptr
 444 script_exp_binary_gt(Expression_ptr, Expression_ptr);
 445 extern Expression_ptr
 446 script_exp_binary_bitwise_and(Expression_ptr, Expression_ptr);
 447 extern Expression_ptr
 448 script_exp_binary_bitwise_xor(Expression_ptr, Expression_ptr);
 449 extern Expression_ptr
 450 script_exp_binary_bitwise_or(Expression_ptr, Expression_ptr);
 451 extern Expression_ptr
 452 script_exp_binary_logical_and(Expression_ptr, Expression_ptr);
 453 extern Expression_ptr
 454 script_exp_binary_logical_or(Expression_ptr, Expression_ptr);
 455 extern Expression_ptr
 456 script_exp_trinary_cond(Expression_ptr, Expression_ptr, Expression_ptr);
 457 extern Expression_ptr
 458 script_exp_integer(uint64_t);
 459 extern Expression_ptr
 460 script_exp_string(const char*, size_t);
 461 extern Expression_ptr
 462 script_exp_function_max(Expression_ptr, Expression_ptr);
 463 extern Expression_ptr
 464 script_exp_function_min(Expression_ptr, Expression_ptr);
 465 extern Expression_ptr
 466 script_exp_function_defined(const char*, size_t);
 467 extern Expression_ptr
 468 script_exp_function_sizeof_headers(void);
 469 extern Expression_ptr
 470 script_exp_function_alignof(const char*, size_t);
 471 extern Expression_ptr
 472 script_exp_function_sizeof(const char*, size_t);
 473 extern Expression_ptr
 474 script_exp_function_addr(const char*, size_t);
 475 extern Expression_ptr
 476 script_exp_function_loadaddr(const char*, size_t);
 477 extern Expression_ptr
 478 script_exp_function_origin(const char*, size_t);
 479 extern Expression_ptr
 480 script_exp_function_length(const char*, size_t);
 481 extern Expression_ptr
 482 script_exp_function_constant(const char*, size_t);
 483 extern Expression_ptr
 484 script_exp_function_absolute(Expression_ptr);
 485 extern Expression_ptr
 486 script_exp_function_align(Expression_ptr, Expression_ptr);
 487 extern Expression_ptr
 488 script_exp_function_data_segment_align(Expression_ptr, Expression_ptr);
 489 extern Expression_ptr
 490 script_exp_function_data_segment_relro_end(Expression_ptr, Expression_ptr);
 491 extern Expression_ptr
 492 script_exp_function_data_segment_end(Expression_ptr);
 493 extern Expression_ptr
 494 script_exp_function_segment_start(const char*, size_t, Expression_ptr);
 495 extern Expression_ptr
 496 script_exp_function_assert(Expression_ptr, const char*, size_t);
 497
 498 extern void
 499 script_register_vers_node(void* closure,
 500                           const char* tag,
 501                           int taglen,
 502                           struct Version_tree *,
 503                           struct Version_dependency_list *);
 504
 505 extern struct Version_dependency_list *
 506 script_add_vers_depend(void* closure,
 507                        struct Version_dependency_list *existing_dependencies,
 508                        const char *depend_to_add, int deplen);
 509
 510 extern struct Version_expression_list *
 511 script_new_vers_pattern(void* closure,
 512                         struct Version_expression_list *,
 513                         const char *, int, int);
 514
 515 extern struct Version_expression_list *
 516 script_merge_expressions(struct Version_expression_list *a,
 517                          struct Version_expression_list *b);
 518
 519 extern struct Version_tree *
 520 script_new_vers_node(void* closure,
 521                      struct Version_expression_list *global,
 522                      struct Version_expression_list *local);
 523
 524 extern void
 525 version_script_push_lang(void* closure, const char* lang, int langlen);
 526
 527 extern void
 528 version_script_pop_lang(void* closure);
 529
 530 #ifdef __cplusplus
 531 } // End extern "C"
 532 #endif
 533
 534 #ifdef __cplusplus
 535 } // End namespace gold.
 536 #endif
 537
 538 #endif /* !defined(GOLD_SCRIPT_C_H) */