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 /* The information we store for an output section header in the bison
  65    parser.  */
  66
  67 struct Parser_output_section_header
  68 {
  69   /* The address.  This may be NULL.  */
  70   Expression_ptr address;
  71   /* The load address, from the AT specifier.  This may be NULL.  */
  72   Expression_ptr load_address;
  73   /* The alignment, from the ALIGN specifier.  This may be NULL.  */
  74   Expression_ptr align;
  75   /* The input section alignment, from the SUBALIGN specifier.  This
  76      may be NULL.  */
  77   Expression_ptr subalign;
  78 };
  79
  80 /* The information we store for an output section trailer in the bison
  81    parser.  */
  82
  83 struct Parser_output_section_trailer
  84 {
  85   /* The fill value.  This may be NULL.  */
  86   Expression_ptr fill;
  87 };
  88
  89 /* We keep vectors of strings.  In order to manage this in both C and
  90    C++, we use a pointer to a vector.  This assumes that all pointers
  91    look the same.  */
  92
  93 #ifdef __cplusplus
  94 typedef std::vector<std::string> String_list;
  95 typedef String_list* String_list_ptr;
  96 #else
  97 typedef void* String_list_ptr;
  98 #endif
  99
 100 /* The different sorts we can find in a linker script.  */
 101
 102 enum Sort_wildcard
 103 {
 104   SORT_WILDCARD_NONE,
 105   SORT_WILDCARD_BY_NAME,
 106   SORT_WILDCARD_BY_ALIGNMENT,
 107   SORT_WILDCARD_BY_NAME_BY_ALIGNMENT,
 108   SORT_WILDCARD_BY_ALIGNMENT_BY_NAME
 109 };
 110
 111 /* The information we build for a single wildcard specification.  */
 112
 113 struct Wildcard_section
 114 {
 115   /* The wildcard spec itself.  */
 116   struct Parser_string name;
 117   /* How the entries should be sorted.  */
 118   enum Sort_wildcard sort;
 119 };
 120
 121 /* A vector of Wildcard_section entries.  */
 122
 123 #ifdef __cplusplus
 124 typedef std::vector<Wildcard_section> String_sort_list;
 125 typedef String_sort_list* String_sort_list_ptr;
 126 #else
 127 typedef void* String_sort_list_ptr;
 128 #endif
 129
 130 /* A list of wildcard specifications, which may include EXCLUDE_FILE
 131    clauses.  */
 132
 133 struct Wildcard_sections
 134 {
 135   /* Wildcard specs.  */
 136   String_sort_list_ptr sections;
 137   /* Exclusions.  */
 138   String_list_ptr exclude;
 139 };
 140
 141 /* A complete input section specification.  */
 142
 143 struct Input_section_spec
 144 {
 145   /* The file name.  */
 146   struct Wildcard_section file;
 147   /* The list of sections.  */
 148   struct Wildcard_sections input_sections;
 149 };
 150
 151 struct Version_dependency_list;
 152 struct Version_expression_list;
 153 struct Version_tree;
 154
 155 #ifdef __cplusplus
 156 extern "C" {
 157 #endif
 158
 159 /* The bison parser definitions.  */
 160
 161 #include "yyscript.h"
 162
 163 /* The bison parser function.  */
 164
 165 extern int
 166 yyparse(void* closure);
 167
 168 /* Called by the bison parser skeleton to return the next token.  */
 169
 170 extern int
 171 yylex(YYSTYPE*, void* closure);
 172
 173 /* Called by the bison parser skeleton to report an error.  */
 174
 175 extern void
 176 yyerror(void* closure, const char*);
 177
 178 /* Called by the bison parser to add a file to the link.  */
 179
 180 extern void
 181 script_add_file(void* closure, const char*, size_t);
 182
 183 /* Called by the bison parser to start and stop a group.  */
 184
 185 extern void
 186 script_start_group(void* closure);
 187 extern void
 188 script_end_group(void* closure);
 189
 190 /* Called by the bison parser to start and end an AS_NEEDED list.  */
 191
 192 extern void
 193 script_start_as_needed(void* closure);
 194 extern void
 195 script_end_as_needed(void* closure);
 196
 197 /* Called by the bison parser to set the entry symbol.  */
 198
 199 extern void
 200 script_set_entry(void* closure, const char*, size_t);
 201
 202 /* Called by the bison parser to parse an OPTION.  */
 203
 204 extern void
 205 script_parse_option(void* closure, const char*, size_t);
 206
 207 /* Called by the bison parser to push the lexer into expression
 208    mode.  */
 209
 210 extern void
 211 script_push_lex_into_expression_mode(void* closure);
 212
 213 /* Called by the bison parser to push the lexer into version
 214    mode.  */
 215
 216 extern void
 217 script_push_lex_into_version_mode(void* closure);
 218
 219 /* Called by the bison parser to pop the lexer mode.  */
 220
 221 extern void
 222 script_pop_lex_mode(void* closure);
 223
 224 /* Called by the bison parser to set a symbol to a value.  PROVIDE is
 225    non-zero if the symbol should be provided--only defined if there is
 226    an undefined reference.  HIDDEN is non-zero if the symbol should be
 227    hidden.  */
 228
 229 extern void
 230 script_set_symbol(void* closure, const char*, size_t, Expression_ptr,
 231                   int provide, int hidden);
 232
 233 /* Called by the bison parser to add an assertion.  */
 234
 235 extern void
 236 script_add_assertion(void* closure, Expression_ptr, const char* message,
 237                      size_t messagelen);
 238
 239 /* Called by the bison parser to start a SECTIONS clause.  */
 240
 241 extern void
 242 script_start_sections(void* closure);
 243
 244 /* Called by the bison parser to finish a SECTIONS clause.  */
 245
 246 extern void
 247 script_finish_sections(void* closure);
 248
 249 /* Called by the bison parser to start handling input section
 250    specifications for an output section.  */
 251
 252 extern void
 253 script_start_output_section(void* closure, const char* name, size_t namelen,
 254                             const struct Parser_output_section_header*);
 255
 256 /* Called by the bison parser when done handling input section
 257    specifications for an output section.  */
 258
 259 extern void
 260 script_finish_output_section(void* closure,
 261                              const struct Parser_output_section_trailer*);
 262
 263 /* Called by the bison parser to handle a data statement (LONG, BYTE,
 264    etc.) in an output section.  */
 265
 266 extern void
 267 script_add_data(void* closure, int data_token, Expression_ptr val);
 268
 269 /* Called by the bison parser to set the fill value in an output
 270    section.  */
 271
 272 extern void
 273 script_add_fill(void* closure, Expression_ptr val);
 274
 275 /* Called by the bison parser to add an input section specification to
 276    an output section.  The KEEP parameter is non-zero if this is
 277    within a KEEP clause, meaning that the garbage collector should not
 278    discard it.  */
 279
 280 extern void
 281 script_add_input_section(void* closure, const struct Input_section_spec*,
 282                          int keep);
 283
 284 /* Create a new list of string and sort entries.  */
 285
 286 extern String_sort_list_ptr
 287 script_new_string_sort_list(const struct Wildcard_section*);
 288
 289 /* Add an entry to a list of string and sort entries.  */
 290
 291 extern String_sort_list_ptr
 292 script_string_sort_list_add(String_sort_list_ptr,
 293                             const struct Wildcard_section*);
 294
 295 /* Create a new list of strings.  */
 296
 297 extern String_list_ptr
 298 script_new_string_list(const char*, size_t);
 299
 300 /* Add an element to a list of strings.  */
 301
 302 extern String_list_ptr
 303 script_string_list_push_back(String_list_ptr, const char*, size_t);
 304
 305 /* Concatenate two string lists.  */
 306
 307 extern String_list_ptr
 308 script_string_list_append(String_list_ptr, String_list_ptr);
 309
 310 /* Called by the bison parser for expressions.  */
 311
 312 extern Expression_ptr
 313 script_exp_unary_minus(Expression_ptr);
 314 extern Expression_ptr
 315 script_exp_unary_logical_not(Expression_ptr);
 316 extern Expression_ptr
 317 script_exp_unary_bitwise_not(Expression_ptr);
 318 extern Expression_ptr
 319 script_exp_binary_mult(Expression_ptr, Expression_ptr);
 320 extern Expression_ptr
 321 script_exp_binary_div(Expression_ptr, Expression_ptr);
 322 extern Expression_ptr
 323 script_exp_binary_mod(Expression_ptr, Expression_ptr);
 324 extern Expression_ptr
 325 script_exp_binary_add(Expression_ptr, Expression_ptr);
 326 extern Expression_ptr
 327 script_exp_binary_sub(Expression_ptr, Expression_ptr);
 328 extern Expression_ptr
 329 script_exp_binary_lshift(Expression_ptr, Expression_ptr);
 330 extern Expression_ptr
 331 script_exp_binary_rshift(Expression_ptr, Expression_ptr);
 332 extern Expression_ptr
 333 script_exp_binary_eq(Expression_ptr, Expression_ptr);
 334 extern Expression_ptr
 335 script_exp_binary_ne(Expression_ptr, Expression_ptr);
 336 extern Expression_ptr
 337 script_exp_binary_le(Expression_ptr, Expression_ptr);
 338 extern Expression_ptr
 339 script_exp_binary_ge(Expression_ptr, Expression_ptr);
 340 extern Expression_ptr
 341 script_exp_binary_lt(Expression_ptr, Expression_ptr);
 342 extern Expression_ptr
 343 script_exp_binary_gt(Expression_ptr, Expression_ptr);
 344 extern Expression_ptr
 345 script_exp_binary_bitwise_and(Expression_ptr, Expression_ptr);
 346 extern Expression_ptr
 347 script_exp_binary_bitwise_xor(Expression_ptr, Expression_ptr);
 348 extern Expression_ptr
 349 script_exp_binary_bitwise_or(Expression_ptr, Expression_ptr);
 350 extern Expression_ptr
 351 script_exp_binary_logical_and(Expression_ptr, Expression_ptr);
 352 extern Expression_ptr
 353 script_exp_binary_logical_or(Expression_ptr, Expression_ptr);
 354 extern Expression_ptr
 355 script_exp_trinary_cond(Expression_ptr, Expression_ptr, Expression_ptr);
 356 extern Expression_ptr
 357 script_exp_integer(uint64_t);
 358 extern Expression_ptr
 359 script_exp_string(const char*, size_t);
 360 extern Expression_ptr
 361 script_exp_function_max(Expression_ptr, Expression_ptr);
 362 extern Expression_ptr
 363 script_exp_function_min(Expression_ptr, Expression_ptr);
 364 extern Expression_ptr
 365 script_exp_function_defined(const char*, size_t);
 366 extern Expression_ptr
 367 script_exp_function_sizeof_headers(void);
 368 extern Expression_ptr
 369 script_exp_function_alignof(const char*, size_t);
 370 extern Expression_ptr
 371 script_exp_function_sizeof(const char*, size_t);
 372 extern Expression_ptr
 373 script_exp_function_addr(const char*, size_t);
 374 extern Expression_ptr
 375 script_exp_function_loadaddr(const char*, size_t);
 376 extern Expression_ptr
 377 script_exp_function_origin(const char*, size_t);
 378 extern Expression_ptr
 379 script_exp_function_length(const char*, size_t);
 380 extern Expression_ptr
 381 script_exp_function_constant(const char*, size_t);
 382 extern Expression_ptr
 383 script_exp_function_absolute(Expression_ptr);
 384 extern Expression_ptr
 385 script_exp_function_align(Expression_ptr, Expression_ptr);
 386 extern Expression_ptr
 387 script_exp_function_data_segment_align(Expression_ptr, Expression_ptr);
 388 extern Expression_ptr
 389 script_exp_function_data_segment_relro_end(Expression_ptr, Expression_ptr);
 390 extern Expression_ptr
 391 script_exp_function_data_segment_end(Expression_ptr);
 392 extern Expression_ptr
 393 script_exp_function_segment_start(const char*, size_t, Expression_ptr);
 394 extern Expression_ptr
 395 script_exp_function_assert(Expression_ptr, const char*, size_t);
 396
 397 extern void
 398 script_register_vers_node(void* closure,
 399                           const char* tag,
 400                           int taglen,
 401                           struct Version_tree *,
 402                           struct Version_dependency_list *);
 403
 404 extern struct Version_dependency_list *
 405 script_add_vers_depend(void* closure,
 406                        struct Version_dependency_list *existing_dependencies,
 407                        const char *depend_to_add, int deplen);
 408
 409 extern struct Version_expression_list *
 410 script_new_vers_pattern(void* closure,
 411                         struct Version_expression_list *,
 412                         const char *, int, int);
 413
 414 extern struct Version_expression_list *
 415 script_merge_expressions(struct Version_expression_list *a,
 416                          struct Version_expression_list *b);
 417
 418 extern struct Version_tree *
 419 script_new_vers_node(void* closure,
 420                      struct Version_expression_list *global,
 421                      struct Version_expression_list *local);
 422
 423 extern void
 424 version_script_push_lang(void* closure, const char* lang, int langlen);
 425
 426 extern void
 427 version_script_pop_lang(void* closure);
 428
 429 #ifdef __cplusplus
 430 } // End extern "C"
 431 #endif
 432
 433 #ifdef __cplusplus
 434 } // End namespace gold.
 435 #endif
 436
 437 #endif /* !defined(GOLD_SCRIPT_C_H) */