include/bfdlink.h

   1 /* bfdlink.h -- header file for BFD link routines
   2    Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002
   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   /* True if ok to have multiple definition.  */
 235   boolean allow_multiple_definition;
 236   /* Which symbols to strip.  */
 237   enum bfd_link_strip strip;
 238   /* Which local symbols to discard.  */
 239   enum bfd_link_discard discard;
 240   /* true if symbols should be retained in memory, false if they
 241      should be freed and reread.  */
 242   boolean keep_memory;
 243   /* The list of input BFD's involved in the link.  These are chained
 244      together via the link_next field.  */
 245   bfd *input_bfds;
 246   /* If a symbol should be created for each input BFD, this is section
 247      where those symbols should be placed.  It must be a section in
 248      the output BFD.  It may be NULL, in which case no such symbols
 249      will be created.  This is to support CREATE_OBJECT_SYMBOLS in the
 250      linker command language.  */
 251   asection *create_object_symbols_section;
 252   /* Hash table handled by BFD.  */
 253   struct bfd_link_hash_table *hash;
 254   /* Hash table of symbols to keep.  This is NULL unless strip is
 255      strip_some.  */
 256   struct bfd_hash_table *keep_hash;
 257   /* true if every symbol should be reported back via the notice
 258      callback.  */
 259   boolean notice_all;
 260   /* Hash table of symbols to report back via the notice callback.  If
 261      this is NULL, and notice_all is false, then no symbols are
 262      reported back.  */
 263   struct bfd_hash_table *notice_hash;
 264   /* Hash table of symbols which are being wrapped (the --wrap linker
 265      option).  If this is NULL, no symbols are being wrapped.  */
 266   struct bfd_hash_table *wrap_hash;
 267   /* If a base output file is wanted, then this points to it */
 268   PTR base_file;
 269
 270   /* If non-zero, specifies that branches which are problematic for the
 271   MPC860 C0 (or earlier) should be checked for and modified.  It gives the
 272   number of bytes that should be checked at the end of each text page. */
 273   int mpc860c0;
 274
 275   /* The function to call when the executable or shared object is
 276      loaded.  */
 277   const char *init_function;
 278   /* The function to call when the executable or shared object is
 279      unloaded.  */
 280   const char *fini_function;
 281
 282   /* true if the new ELF dynamic tags are enabled. */
 283   boolean new_dtags;
 284
 285   /* May be used to set DT_FLAGS for ELF. */
 286   bfd_vma flags;
 287
 288   /* May be used to set DT_FLAGS_1 for ELF. */
 289   bfd_vma flags_1;
 290
 291   /* True if auto-import thunks for DATA items in pei386 DLLs
 292      should be generated/linked against.  */
 293   boolean pei386_auto_import;
 294
 295   /* True if non-PLT relocs should be merged into one reloc section
 296      and sorted so that relocs against the same symbol come together.  */
 297   boolean combreloc;
 298
 299   /* True if executable should not contain copy relocs.
 300      Setting this true may result in a non-sharable text segment.  */
 301   boolean nocopyreloc;
 302
 303   /* True if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment
 304      should be created.  */
 305   boolean eh_frame_hdr;
 306
 307   /* How many spare .dynamic DT_NULL entries should be added?  */
 308   unsigned int spare_dynamic_tags;
 309 };
 310
 311 /* This structures holds a set of callback functions.  These are
 312    called by the BFD linker routines.  The first argument to each
 313    callback function is the bfd_link_info structure being used.  Each
 314    function returns a boolean value.  If the function returns false,
 315    then the BFD function which called it will return with a failure
 316    indication.  */
 317
 318 struct bfd_link_callbacks
 319 {
 320   /* A function which is called when an object is added from an
 321      archive.  ABFD is the archive element being added.  NAME is the
 322      name of the symbol which caused the archive element to be pulled
 323      in.  */
 324   boolean (*add_archive_element) PARAMS ((struct bfd_link_info *,
 325                                           bfd *abfd,
 326                                           const char *name));
 327   /* A function which is called when a symbol is found with multiple
 328      definitions.  NAME is the symbol which is defined multiple times.
 329      OBFD is the old BFD, OSEC is the old section, OVAL is the old
 330      value, NBFD is the new BFD, NSEC is the new section, and NVAL is
 331      the new value.  OBFD may be NULL.  OSEC and NSEC may be
 332      bfd_com_section or bfd_ind_section.  */
 333   boolean (*multiple_definition) PARAMS ((struct bfd_link_info *,
 334                                           const char *name,
 335                                           bfd *obfd,
 336                                           asection *osec,
 337                                           bfd_vma oval,
 338                                           bfd *nbfd,
 339                                           asection *nsec,
 340                                           bfd_vma nval));
 341   /* A function which is called when a common symbol is defined
 342      multiple times.  NAME is the symbol appearing multiple times.
 343      OBFD is the BFD of the existing symbol; it may be NULL if this is
 344      not known.  OTYPE is the type of the existing symbol, which may
 345      be bfd_link_hash_defined, bfd_link_hash_defweak,
 346      bfd_link_hash_common, or bfd_link_hash_indirect.  If OTYPE is
 347      bfd_link_hash_common, OSIZE is the size of the existing symbol.
 348      NBFD is the BFD of the new symbol.  NTYPE is the type of the new
 349      symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or
 350      bfd_link_hash_indirect.  If NTYPE is bfd_link_hash_common, NSIZE
 351      is the size of the new symbol.  */
 352   boolean (*multiple_common) PARAMS ((struct bfd_link_info *,
 353                                       const char *name,
 354                                       bfd *obfd,
 355                                       enum bfd_link_hash_type otype,
 356                                       bfd_vma osize,
 357                                       bfd *nbfd,
 358                                       enum bfd_link_hash_type ntype,
 359                                       bfd_vma nsize));
 360   /* A function which is called to add a symbol to a set.  ENTRY is
 361      the link hash table entry for the set itself (e.g.,
 362      __CTOR_LIST__).  RELOC is the relocation to use for an entry in
 363      the set when generating a relocateable file, and is also used to
 364      get the size of the entry when generating an executable file.
 365      ABFD, SEC and VALUE identify the value to add to the set.  */
 366   boolean (*add_to_set) PARAMS ((struct bfd_link_info *,
 367                                  struct bfd_link_hash_entry *entry,
 368                                  bfd_reloc_code_real_type reloc,
 369                                  bfd *abfd, asection *sec, bfd_vma value));
 370   /* A function which is called when the name of a g++ constructor or
 371      destructor is found.  This is only called by some object file
 372      formats.  CONSTRUCTOR is true for a constructor, false for a
 373      destructor.  This will use BFD_RELOC_CTOR when generating a
 374      relocateable file.  NAME is the name of the symbol found.  ABFD,
 375      SECTION and VALUE are the value of the symbol.  */
 376   boolean (*constructor) PARAMS ((struct bfd_link_info *,
 377                                   boolean constructor,
 378                                   const char *name, bfd *abfd, asection *sec,
 379                                   bfd_vma value));
 380   /* A function which is called to issue a linker warning.  For
 381      example, this is called when there is a reference to a warning
 382      symbol.  WARNING is the warning to be issued.  SYMBOL is the name
 383      of the symbol which triggered the warning; it may be NULL if
 384      there is none.  ABFD, SECTION and ADDRESS identify the location
 385      which trigerred the warning; either ABFD or SECTION or both may
 386      be NULL if the location is not known.  */
 387   boolean (*warning) PARAMS ((struct bfd_link_info *,
 388                               const char *warning, const char *symbol,
 389                               bfd *abfd, asection *section,
 390                               bfd_vma address));
 391   /* A function which is called when a relocation is attempted against
 392      an undefined symbol.  NAME is the symbol which is undefined.
 393      ABFD, SECTION and ADDRESS identify the location from which the
 394      reference is made. FATAL indicates whether an undefined symbol is
 395      a fatal error or not. In some cases SECTION may be NULL.  */
 396   boolean (*undefined_symbol) PARAMS ((struct bfd_link_info *,
 397                                        const char *name, bfd *abfd,
 398                                        asection *section,
 399                                        bfd_vma address,
 400                                        boolean fatal));
 401   /* A function which is called when a reloc overflow occurs.  NAME is
 402      the name of the symbol or section the reloc is against,
 403      RELOC_NAME is the name of the relocation, and ADDEND is any
 404      addend that is used.  ABFD, SECTION and ADDRESS identify the
 405      location at which the overflow occurs; if this is the result of a
 406      bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
 407      ABFD will be NULL.  */
 408   boolean (*reloc_overflow) PARAMS ((struct bfd_link_info *,
 409                                      const char *name,
 410                                      const char *reloc_name, bfd_vma addend,
 411                                      bfd *abfd, asection *section,
 412                                      bfd_vma address));
 413   /* A function which is called when a dangerous reloc is performed.
 414      The canonical example is an a29k IHCONST reloc which does not
 415      follow an IHIHALF reloc.  MESSAGE is an appropriate message.
 416      ABFD, SECTION and ADDRESS identify the location at which the
 417      problem occurred; if this is the result of a
 418      bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
 419      ABFD will be NULL.  */
 420   boolean (*reloc_dangerous) PARAMS ((struct bfd_link_info *,
 421                                       const char *message,
 422                                       bfd *abfd, asection *section,
 423                                       bfd_vma address));
 424   /* A function which is called when a reloc is found to be attached
 425      to a symbol which is not being written out.  NAME is the name of
 426      the symbol.  ABFD, SECTION and ADDRESS identify the location of
 427      the reloc; if this is the result of a
 428      bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then
 429      ABFD will be NULL.  */
 430   boolean (*unattached_reloc) PARAMS ((struct bfd_link_info *,
 431                                        const char *name,
 432                                        bfd *abfd, asection *section,
 433                                        bfd_vma address));
 434   /* A function which is called when a symbol in notice_hash is
 435      defined or referenced.  NAME is the symbol.  ABFD, SECTION and
 436      ADDRESS are the value of the symbol.  If SECTION is
 437      bfd_und_section, this is a reference.  */
 438   boolean (*notice) PARAMS ((struct bfd_link_info *, const char *name,
 439                              bfd *abfd, asection *section, bfd_vma address));
 440 };
 441 \f
 442 /* The linker builds link_order structures which tell the code how to
 443    include input data in the output file.  */
 444
 445 /* These are the types of link_order structures.  */
 446
 447 enum bfd_link_order_type
 448 {
 449   bfd_undefined_link_order,     /* Undefined.  */
 450   bfd_indirect_link_order,      /* Built from a section.  */
 451   bfd_data_link_order,          /* Set to explicit data.  */
 452   bfd_section_reloc_link_order, /* Relocate against a section.  */
 453   bfd_symbol_reloc_link_order   /* Relocate against a symbol.  */
 454 };
 455
 456 /* This is the link_order structure itself.  These form a chain
 457    attached to the section whose contents they are describing.  */
 458
 459 struct bfd_link_order
 460 {
 461   /* Next link_order in chain.  */
 462   struct bfd_link_order *next;
 463   /* Type of link_order.  */
 464   enum bfd_link_order_type type;
 465   /* Offset within output section.  */
 466   bfd_vma offset;
 467   /* Size within output section.  */
 468   bfd_size_type size;
 469   /* Type specific information.  */
 470   union
 471     {
 472       struct
 473         {
 474           /* Section to include.  If this is used, then
 475              section->output_section must be the section the
 476              link_order is attached to, section->output_offset must
 477              equal the link_order offset field, and section->_raw_size
 478              must equal the link_order size field.  Maybe these
 479              restrictions should be relaxed someday.  */
 480           asection *section;
 481         } indirect;
 482       struct
 483         {
 484           /* Size of contents, or zero when contents size == size
 485              within output section.
 486              A non-zero value allows filling of the output section
 487              with an arbitrary repeated pattern.  */
 488           unsigned int size;
 489           /* Data to put into file.  */
 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