include/bfdlink.h

   1 /* bfdlink.h -- header file for BFD link routines
   2    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
   3    Free Software Foundation, Inc.
   4    Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support.
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef BFDLINK_H
  23 #define BFDLINK_H
  24
  25 /* Which symbols to strip during a link.  */
  26 enum bfd_link_strip
  27 {
  28   strip_none,           /* Don't strip any symbols.  */
  29   strip_debugger,       /* Strip debugging symbols.  */
  30   strip_some,           /* keep_hash is the list of symbols to keep.  */
  31   strip_all             /* Strip all symbols.  */
  32 };
  33
  34 /* Which local symbols to discard during a link.  This is irrelevant
  35    if strip_all is used.  */
  36 enum bfd_link_discard
  37 {
  38   discard_sec_merge,    /* Discard local temporary symbols in SEC_MERGE
  39                            sections.  */
  40   discard_none,         /* Don't discard any locals.  */
  41   discard_l,            /* Discard local temporary symbols.  */
  42   discard_all           /* Discard all locals.  */
  43 };
  44
  45 /* Describes the type of hash table entry structure being used.
  46    Different hash table structure have different fields and so
  47    support different linking features.  */
  48 enum bfd_link_hash_table_type
  49   {
  50     bfd_link_generic_hash_table,
  51     bfd_link_elf_hash_table
  52   };
  53 \f
  54 /* These are the possible types of an entry in the BFD link hash
  55    table.  */
  56
  57 enum bfd_link_hash_type
  58 {
  59   bfd_link_hash_new,            /* Symbol is new.  */
  60   bfd_link_hash_undefined,      /* Symbol seen before, but undefined.  */
  61   bfd_link_hash_undefweak,      /* Symbol is weak and undefined.  */
  62   bfd_link_hash_defined,        /* Symbol is defined.  */
  63   bfd_link_hash_defweak,        /* Symbol is weak and defined.  */
  64   bfd_link_hash_common,         /* Symbol is common.  */
  65   bfd_link_hash_indirect,       /* Symbol is an indirect link.  */
  66   bfd_link_hash_warning         /* Like indirect, but warn if referenced.  */
  67 };
  68
  69 /* The linking routines use a hash table which uses this structure for
  70    its elements.  */
  71
  72 struct bfd_link_hash_entry
  73 {
  74   /* Base hash table entry structure.  */
  75   struct bfd_hash_entry root;
  76   /* Type of this entry.  */
  77   enum bfd_link_hash_type type;
  78
  79   /* Undefined and common symbols are kept in a linked list through
  80      this field.  This field is not in the union because that would
  81      force us to remove entries from the list when we changed their
  82      type, which would force the list to be doubly linked, which would
  83      waste more memory.  When an undefined or common symbol is
  84      created, it should be added to this list, the head of which is in
  85      the link hash table itself.  As symbols are defined, they need
  86      not be removed from the list; anything which reads the list must
  87      doublecheck the symbol type.
  88
  89      Weak symbols are not kept on this list.
  90
  91      Defined and defweak symbols use this field as a reference marker.
  92      If the field is not NULL, or this structure is the tail of the
  93      undefined symbol list, the symbol has been referenced.  If the
  94      symbol is undefined and becomes defined, this field will
  95      automatically be non-NULL since the symbol will have been on the
  96      undefined symbol list.  */
  97   struct bfd_link_hash_entry *next;
  98   /* A union of information depending upon the type.  */
  99   union
 100     {
 101       /* Nothing is kept for bfd_hash_new.  */
 102       /* bfd_link_hash_undefined, bfd_link_hash_undefweak.  */
 103       struct
 104         {
 105           bfd *abfd;            /* BFD symbol was found in.  */
 106         } undef;
 107       /* bfd_link_hash_defined, bfd_link_hash_defweak.  */
 108       struct
 109         {
 110           bfd_vma value;        /* Symbol value.  */
 111           asection *section;    /* Symbol section.  */
 112         } def;
 113       /* bfd_link_hash_indirect, bfd_link_hash_warning.  */
 114       struct
 115         {
 116           struct bfd_link_hash_entry *link;     /* Real symbol.  */
 117           const char *warning;  /* Warning (bfd_link_hash_warning only).  */
 118         } i;
 119       /* bfd_link_hash_common.  */
 120       struct
 121         {
 122           /* The linker needs to know three things about common
 123              symbols: the size, the alignment, and the section in
 124              which the symbol should be placed.  We store the size
 125              here, and we allocate a small structure to hold the
 126              section and the alignment.  The alignment is stored as a
 127              power of two.  We don't store all the information
 128              directly because we don't want to increase the size of
 129              the union; this structure is a major space user in the
 130              linker.  */
 131           bfd_size_type size;   /* Common symbol size.  */
 132           struct bfd_link_hash_common_entry
 133             {
 134               unsigned int alignment_power;     /* Alignment.  */
 135               asection *section;                /* Symbol section.  */
 136             } *p;
 137         } c;
 138     } u;
 139 };
 140
 141 /* This is the link hash table.  It is a derived class of
 142    bfd_hash_table.  */
 143
 144 struct bfd_link_hash_table
 145 {
 146   /* The hash table itself.  */
 147   struct bfd_hash_table table;
 148   /* The back end which created this hash table.  This indicates the
 149      type of the entries in the hash table, which is sometimes
 150      important information when linking object files of different
 151      types together.  */
 152   const bfd_target *creator;
 153   /* A linked list of undefined and common symbols, linked through the
 154      next field in the bfd_link_hash_entry structure.  */
 155   struct bfd_link_hash_entry *undefs;
 156   /* Entries are added to the tail of the undefs list.  */
 157   struct bfd_link_hash_entry *undefs_tail;
 158   /* The type of the ink hash table.  */
 159   enum bfd_link_hash_table_type type;
 160 };
 161
 162 /* Look up an entry in a link hash table.  If FOLLOW is true, this
 163    follows bfd_link_hash_indirect and bfd_link_hash_warning links to
 164    the real symbol.  */
 165 extern struct bfd_link_hash_entry *bfd_link_hash_lookup
 166   PARAMS ((struct bfd_link_hash_table *, const char *, boolean create,
 167            boolean copy, boolean follow));
 168
 169 /* Look up an entry in the main linker hash table if the symbol might
 170    be wrapped.  This should only be used for references to an
 171    undefined symbol, not for definitions of a symbol.  */
 172
 173 extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup
 174   PARAMS ((bfd *, struct bfd_link_info *, const char *, boolean, boolean,
 175            boolean));
 176
 177 /* Traverse a link hash table.  */
 178 extern void bfd_link_hash_traverse
 179   PARAMS ((struct bfd_link_hash_table *,
 180            boolean (*) (struct bfd_link_hash_entry *, PTR),
 181            PTR));
 182
 183 /* Add an entry to the undefs list.  */
 184 extern void bfd_link_add_undef
 185   PARAMS ((struct bfd_link_hash_table *, struct bfd_link_hash_entry *));
 186 \f
 187 /* This structure holds all the information needed to communicate
 188    between BFD and the linker when doing a link.  */
 189
 190 struct bfd_link_info
 191 {
 192   /* Function callbacks.  */
 193   const struct bfd_link_callbacks *callbacks;
 194   /* true if BFD should generate a relocateable object file.  */
 195   boolean relocateable;
 196   /* true if BFD should generate relocation information in the final executable.  */
 197   boolean emitrelocations;
 198   /* true if BFD should generate a "task linked" object file,
 199      similar to relocatable but also with globals converted to statics. */
 200   boolean task_link;
 201   /* true if BFD should generate a shared object.  */
 202   boolean shared;
 203   /* true if BFD should pre-bind symbols in a shared object.  */
 204   boolean symbolic;
 205   /* true if BFD should export all symbols in the dynamic symbol table
 206      of an executable, rather than only those used.  */
 207   boolean export_dynamic;
 208   /* true if shared objects should be linked directly, not shared.  */
 209   boolean static_link;
 210   /* true if the output file should be in a traditional format.  This
 211      is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag
 212      on the output file, but may be checked when reading the input
 213      files.  */
 214   boolean traditional_format;
 215   /* true if we want to produced optimized output files.  This might
 216      need much more time and therefore must be explicitly selected.  */
 217   boolean optimize;
 218   /* true if BFD should generate errors for undefined symbols
 219      even if generating a shared object.  */
 220   boolean no_undefined;
 221   /* true if BFD should allow undefined symbols in shared objects even
 222      when no_undefined is set to disallow undefined symbols.  The net
 223      result will be that undefined symbols in regular objects will
 224      still trigger an error, but undefined symbols in shared objects
 225      will be ignored.  The implementation of no_undefined makes the
 226      assumption that the runtime linker will choke on undefined
 227      symbols.  However there is at least one system (BeOS) where
 228      undefined symbols in shared libraries is normal since the kernel
 229      patches them at load time to select which function is most
 230      appropriate for the current architecture.  I.E. dynamically
 231      select an appropriate memset function.  Apparently it is also
 232      normal for HPPA shared libraries to have undefined symbols.  */
 233   boolean allow_shlib_undefined;
 234   /* Which symbols to strip.  */
 235   enum bfd_link_strip strip;
 236   /* Which local symbols to discard.  */
 237   enum bfd_link_discard discard;
 238   /* true if symbols should be retained in memory, false if they
 239      should be freed and reread.  */
 240   boolean keep_memory;
 241   /* The list of input BFD's involved in the link.  These are chained
 242      together via the link_next field.  */
 243   bfd *input_bfds;
 244   /* If a symbol should be created for each input BFD, this is section
 245      where those symbols should be placed.  It must be a section in
 246      the output BFD.  It may be NULL, in which case no such symbols
 247      will be created.  This is to support CREATE_OBJECT_SYMBOLS in the
 248      linker command language.  */
 249   asection *create_object_symbols_section;
 250   /* Hash table handled by BFD.  */
 251   struct bfd_link_hash_table *hash;
 252   /* Hash table of symbols to keep.  This is NULL unless strip is
 253      strip_some.  */
 254   struct bfd_hash_table *keep_hash;
 255   /* true if every symbol should be reported back via the notice
 256      callback.  */
 257   boolean notice_all;
 258   /* Hash table of symbols to report back via the notice callback.  If
 259      this is NULL, and notice_all is false, then no symbols are
 260      reported back.  */
 261   struct bfd_hash_table *notice_hash;
 262   /* Hash table of symbols which are being wrapped (the --wrap linker
 263      option).  If this is NULL, no symbols are being wrapped.  */
 264   struct bfd_hash_table *wrap_hash;
 265   /* If a base output file is wanted, then this points to it */
 266   PTR base_file;
 267
 268   /* If non-zero, specifies that branches which are problematic for the
 269   MPC860 C0 (or earlier) should be checked for and modified.  It gives the
 270   number of bytes that should be checked at the end of each text page. */
 271   int mpc860c0;
 272
 273   /* The function to call when the executable or shared object is
 274      loaded.  */
 275   const char *init_function;
 276   /* The function to call when the executable or shared object is
 277      unloaded.  */
 278   const char *fini_function;
 279
 280   /* true if the new ELF dynamic tags are enabled. */
 281   boolean new_dtags;
 282
 283   /* May be used to set DT_FLAGS for ELF. */
 284   bfd_vma flags;
 285
 286   /* May be used to set DT_FLAGS_1 for ELF. */
 287   bfd_vma flags_1;
 288
 289   /* True if auto-import thunks for DATA items in pei386 DLLs
 290      should be generated/linked against.  */
 291   boolean pei386_auto_import;
 292
 293   /* True if non-PLT relocs should be merged into one reloc section
 294      and sorted so that relocs against the same symbol come together.  */
 295   boolean combreloc;
 296
 297   /* True if executable should not contain copy relocs.
 298      Setting this true may result in a non-sharable text segment.  */
 299   boolean nocopyreloc;
 300
 301   /* True if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment
 302      should be created.  */
 303   boolean eh_frame_hdr;
 304
 305   /* How many spare .dynamic DT_NULL entries should be added?  */
 306   unsigned int spare_dynamic_tags;
 307 };
 308
 309 /* This structures holds a set of callback functions.  These are
 310    called by the BFD linker routines.  The first argument to each
 311    callback function is the bfd_link_info structure being used.  Each
 312    function returns a boolean value.  If the function returns false,
 313    then the BFD function which called it will return with a failure
 314    indication.  */
 315
 316 struct bfd_link_callbacks
 317 {
 318   /* A function which is called when an object is added from an
 319      archive.  ABFD is the archive element being added.  NAME is the
 320      name of the symbol which caused the archive element to be pulled
 321      in.  */
 322   boolean (*add_archive_element) PARAMS ((struct bfd_link_info *,
 323                                           bfd *abfd,
 324                                           const char *name));
 325   /* A function which is called when a symbol is found with multiple
 326      definitions.  NAME is the symbol which is defined multiple times.
 327      OBFD is the old BFD, OSEC is the old section, OVAL is the old
 328      value, NBFD is the new BFD, NSEC is the new section, and NVAL is
 329      the new value.  OBFD may be NULL.  OSEC and NSEC may be
 330      bfd_com_section or bfd_ind_section.  */
 331   boolean (*multiple_definition) PARAMS ((struct bfd_link_info *,
 332                                           const char *name,
 333                                           bfd *obfd,
 334                                           asection *osec,
 335                                           bfd_vma oval,
 336                                           bfd *nbfd,
 337                                           asection *nsec,
 338                                           bfd_vma nval));
 339   /* A function which is called when a common symbol is defined
 340      multiple times.  NAME is the symbol appearing multiple times.
 341      OBFD is the BFD of the existing symbol; it may be NULL if this is
 342      not known.  OTYPE is the type of the existing symbol, which may
 343      be bfd_link_hash_defined, bfd_link_hash_defweak,
 344      bfd_link_hash_common, or bfd_link_hash_indirect.  If OTYPE is
 345      bfd_link_hash_common, OSIZE is the size of the existing symbol.
 346      NBFD is the BFD of the new symbol.  NTYPE is the type of the new
 347      symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or
 348      bfd_link_hash_indirect.  If NTYPE is bfd_link_hash_common, NSIZE
 349      is the size of the new symbol.  */
 350   boolean (*multiple_common) PARAMS ((struct bfd_link_info *,
 351                                       const char *name,
 352                                       bfd *obfd,
 353                                       enum bfd_link_hash_type otype,
 354                                       bfd_vma osize,
 355                                       bfd *nbfd,
 356                                       enum bfd_link_hash_type ntype,
 357                                       bfd_vma nsize));
 358   /* A function which is called to add a symbol to a set.  ENTRY is
 359      the link hash table entry for the set itself (e.g.,
 360      __CTOR_LIST__).  RELOC is the relocation to use for an entry in
 361      the set when generating a relocateable file, and is also used to
 362      get the size of the entry when generating an executable file.
 363      ABFD, SEC and VALUE identify the value to add to the set.  */
 364   boolean (*add_to_set) PARAMS ((struct bfd_link_info *,
 365                                  struct bfd_link_hash_entry *entry,
 366                                  bfd_reloc_code_real_type reloc,
 367                                  bfd *abfd, asection *sec, bfd_vma value));
 368   /* A function which is called when the name of a g++ constructor or
 369      destructor is found.  This is only called by some object file
 370      formats.  CONSTRUCTOR is true for a constructor, false for a
 371      destructor.  This will use BFD_RELOC_CTOR when generating a
 372      relocateable file.  NAME is the name of the symbol found.  ABFD,
 373      SECTION and VALUE are the value of the symbol.  */
 374   boolean (*constructor) PARAMS ((struct bfd_link_info *,
 375                                   boolean constructor,
 376                                   const char *name, bfd *abfd, asection *sec,
 377                                   bfd_vma value));
 378   /* A function which is called to issue a linker warning.  For
 379      example, this is called when there is a reference to a warning
 380      symbol.  WARNING is the warning to be issued.  SYMBOL is the name
 381      of the symbol which triggered the warning; it may be NULL if
 382      there is none.  ABFD, SECTION and ADDRESS identify the location
 383      which trigerred the warning; either ABFD or SECTION or both may
 384      be NULL if the location is not known.  */
 385   boolean (*warning) PARAMS ((struct bfd_link_info *,
 386                               const char *warning, const char *symbol,
 387                               bfd *abfd, asection *section,
 388                               bfd_vma address));
 389   /* A function which is called when a relocation is attempted against
 390      an undefined symbol.  NAME is the symbol which is undefined.
 391      ABFD, SECTION and ADDRESS identify the location from which the
 392      reference is made. FATAL indicates whether an undefined symbol is
 393      a fatal error or not. In some cases SECTION may be NULL.  */
 394   boolean (*undefined_symbol) PARAMS ((struct bfd_link_info *,
 395                                        const char *name, bfd *abfd,
 396                                        asection *section,
 397                                        bfd_vma address,
 398                                        boolean fatal));
 399   /* A function which is called when a reloc overflow occurs.  NAME is
 400      the name of the symbol or section the reloc is against,
 401      RELOC_NAME is the name of the relocation, and ADDEND is any
 402      addend that is used.  ABFD, SECTION and ADDRESS identify the
 403      location at which the overflow occurs; if this is the result of a
 404      bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
 405      ABFD will be NULL.  */
 406   boolean (*reloc_overflow) PARAMS ((struct bfd_link_info *,
 407                                      const char *name,
 408                                      const char *reloc_name, bfd_vma addend,
 409                                      bfd *abfd, asection *section,
 410                                      bfd_vma address));
 411   /* A function which is called when a dangerous reloc is performed.
 412      The canonical example is an a29k IHCONST reloc which does not
 413      follow an IHIHALF reloc.  MESSAGE is an appropriate message.
 414      ABFD, SECTION and ADDRESS identify the location at which the
 415      problem occurred; if this is the result of a
 416      bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
 417      ABFD will be NULL.  */
 418   boolean (*reloc_dangerous) PARAMS ((struct bfd_link_info *,
 419                                       const char *message,
 420                                       bfd *abfd, asection *section,
 421                                       bfd_vma address));
 422   /* A function which is called when a reloc is found to be attached
 423      to a symbol which is not being written out.  NAME is the name of
 424      the symbol.  ABFD, SECTION and ADDRESS identify the location of
 425      the reloc; if this is the result of a
 426      bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
 427      ABFD will be NULL.  */
 428   boolean (*unattached_reloc) PARAMS ((struct bfd_link_info *,
 429                                        const char *name,
 430                                        bfd *abfd, asection *section,
 431                                        bfd_vma address));
 432   /* A function which is called when a symbol in notice_hash is
 433      defined or referenced.  NAME is the symbol.  ABFD, SECTION and
 434      ADDRESS are the value of the symbol.  If SECTION is
 435      bfd_und_section, this is a reference.  */
 436   boolean (*notice) PARAMS ((struct bfd_link_info *, const char *name,
 437                              bfd *abfd, asection *section, bfd_vma address));
 438 };
 439 \f
 440 /* The linker builds link_order structures which tell the code how to
 441    include input data in the output file.  */
 442
 443 /* These are the types of link_order structures.  */
 444
 445 enum bfd_link_order_type
 446 {
 447   bfd_undefined_link_order,     /* Undefined.  */
 448   bfd_indirect_link_order,      /* Built from a section.  */
 449   bfd_fill_link_order,          /* Fill with a 16 bit constant.  */
 450   bfd_data_link_order,          /* Set to explicit data.  */
 451   bfd_section_reloc_link_order, /* Relocate against a section.  */
 452   bfd_symbol_reloc_link_order   /* Relocate against a symbol.  */
 453 };
 454
 455 /* This is the link_order structure itself.  These form a chain
 456    attached to the section whose contents they are describing.  */
 457
 458 struct bfd_link_order
 459 {
 460   /* Next link_order in chain.  */
 461   struct bfd_link_order *next;
 462   /* Type of link_order.  */
 463   enum bfd_link_order_type type;
 464   /* Offset within output section.  */
 465   bfd_vma offset;
 466   /* Size within output section.  */
 467   bfd_size_type size;
 468   /* Type specific information.  */
 469   union
 470     {
 471       struct
 472         {
 473           /* Section to include.  If this is used, then
 474              section->output_section must be the section the
 475              link_order is attached to, section->output_offset must
 476              equal the link_order offset field, and section->_raw_size
 477              must equal the link_order size field.  Maybe these
 478              restrictions should be relaxed someday.  */
 479           asection *section;
 480         } indirect;
 481       struct
 482         {
 483           /* Value to fill with.  */
 484           unsigned int value;
 485         } fill;
 486       struct
 487         {
 488           /* Data to put into file.  The size field gives the number
 489              of bytes which this field points to.  */
 490           bfd_byte *contents;
 491         } data;
 492       struct
 493         {
 494           /* Description of reloc to generate.  Used for
 495              bfd_section_reloc_link_order and
 496              bfd_symbol_reloc_link_order.  */
 497           struct bfd_link_order_reloc *p;
 498         } reloc;
 499     } u;
 500 };
 501
 502 /* A linker order of type bfd_section_reloc_link_order or
 503    bfd_symbol_reloc_link_order means to create a reloc against a
 504    section or symbol, respectively.  This is used to implement -Ur to
 505    generate relocs for the constructor tables.  The
 506    bfd_link_order_reloc structure describes the reloc that BFD should
 507    create.  It is similar to a arelent, but I didn't use arelent
 508    because the linker does not know anything about most symbols, and
 509    any asymbol structure it creates will be partially meaningless.
 510    This information could logically be in the bfd_link_order struct,
 511    but I didn't want to waste the space since these types of relocs
 512    are relatively rare.  */
 513
 514 struct bfd_link_order_reloc
 515 {
 516   /* Reloc type.  */
 517   bfd_reloc_code_real_type reloc;
 518
 519   union
 520     {
 521       /* For type bfd_section_reloc_link_order, this is the section
 522          the reloc should be against.  This must be a section in the
 523          output BFD, not any of the input BFDs.  */
 524       asection *section;
 525       /* For type bfd_symbol_reloc_link_order, this is the name of the
 526          symbol the reloc should be against.  */
 527       const char *name;
 528     } u;
 529
 530   /* Addend to use.  The object file should contain zero.  The BFD
 531      backend is responsible for filling in the contents of the object
 532      file correctly.  For some object file formats (e.g., COFF) the
 533      addend must be stored into in the object file, and for some
 534      (e.g., SPARC a.out) it is kept in the reloc.  */
 535   bfd_vma addend;
 536 };
 537
 538 /* Allocate a new link_order for a section.  */
 539 extern struct bfd_link_order *bfd_new_link_order PARAMS ((bfd *, asection *));
 540
 541 /* These structures are used to describe version information for the
 542    ELF linker.  These structures could be manipulated entirely inside
 543    BFD, but it would be a pain.  Instead, the regular linker sets up
 544    these structures, and then passes them into BFD.  */
 545
 546 /* Regular expressions for a version.  */
 547
 548 struct bfd_elf_version_expr
 549 {
 550   /* Next regular expression for this version.  */
 551   struct bfd_elf_version_expr *next;
 552   /* Regular expression.  */
 553   const char *pattern;
 554   /* Matching function.  */
 555   int (*match) PARAMS((struct bfd_elf_version_expr *, const char *));
 556 };
 557
 558 /* Version dependencies.  */
 559
 560 struct bfd_elf_version_deps
 561 {
 562   /* Next dependency for this version.  */
 563   struct bfd_elf_version_deps *next;
 564   /* The version which this version depends upon.  */
 565   struct bfd_elf_version_tree *version_needed;
 566 };
 567
 568 /* A node in the version tree.  */
 569
 570 struct bfd_elf_version_tree
 571 {
 572   /* Next version.  */
 573   struct bfd_elf_version_tree *next;
 574   /* Name of this version.  */
 575   const char *name;
 576   /* Version number.  */
 577   unsigned int vernum;
 578   /* Regular expressions for global symbols in this version.  */
 579   struct bfd_elf_version_expr *globals;
 580   /* Regular expressions for local symbols in this version.  */
 581   struct bfd_elf_version_expr *locals;
 582   /* List of versions which this version depends upon.  */
 583   struct bfd_elf_version_deps *deps;
 584   /* Index of the version name.  This is used within BFD.  */
 585   unsigned int name_indx;
 586   /* Whether this version tree was used.  This is used within BFD.  */
 587   int used;
 588 };
 589
 590 #endif