1  /* genlink.h -- interface to the BFD generic linker
       2     Copyright (C) 1993-2023 Free Software Foundation, Inc.
       3     Written by Ian Lance Taylor, Cygnus Support.
       4  
       5     This file is part of BFD, the Binary File Descriptor library.
       6  
       7     This program is free software; you can redistribute it and/or modify
       8     it under the terms of the GNU General Public License as published by
       9     the Free Software Foundation; either version 3 of the License, or
      10     (at your option) any later version.
      11  
      12     This program is distributed in the hope that it will be useful,
      13     but WITHOUT ANY WARRANTY; without even the implied warranty of
      14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15     GNU General Public License for more details.
      16  
      17     You should have received a copy of the GNU General Public License
      18     along with this program; if not, write to the Free Software
      19     Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
      20     MA 02110-1301, USA.  */
      21  
      22  #ifndef GENLINK_H
      23  #define GENLINK_H
      24  
      25  /* This header file is internal to BFD.  It describes the internal
      26     structures and functions used by the BFD generic linker, in case
      27     any of the more specific linkers want to use or call them.  Note
      28     that some functions, such as _bfd_generic_link_hash_table_create,
      29     are declared in libbfd.h, because they are expected to be widely
      30     used.  The functions and structures in this file will probably only
      31     be used by a few files besides linker.c itself.  In fact, this file
      32     is not particularly complete; I have only put in the interfaces I
      33     actually needed.  */
      34  
      35  /* The generic linker uses a hash table which is a derived class of
      36     the standard linker hash table, just as the other backend specific
      37     linkers do.  Do not confuse the generic linker hash table with the
      38     standard BFD linker hash table it is built upon.  */
      39  
      40  /* Generic linker hash table entries.  */
      41  
      42  struct generic_link_hash_entry
      43  {
      44    struct bfd_link_hash_entry root;
      45    /* Whether this symbol has been written out.  */
      46    bool written;
      47    /* Symbol from input BFD.  */
      48    asymbol *sym;
      49  };
      50  
      51  /* Generic linker hash table.  */
      52  
      53  struct generic_link_hash_table
      54  {
      55    struct bfd_link_hash_table root;
      56  };
      57  
      58  /* Look up an entry in a generic link hash table.  */
      59  
      60  #define _bfd_generic_link_hash_lookup(table, string, create, copy, follow) \
      61    ((struct generic_link_hash_entry *) \
      62     bfd_link_hash_lookup (&(table)->root, (string), (create), (copy), (follow)))
      63  
      64  /* Traverse a generic link hash table.  */
      65  
      66  #define _bfd_generic_link_hash_traverse(table, func, info)		\
      67    (bfd_link_hash_traverse						\
      68     (&(table)->root,							\
      69      (bool (*) (struct bfd_link_hash_entry *, void *)) (func),		\
      70      (info)))
      71  
      72  /* Get the generic link hash table from the info structure.  This is
      73     just a cast.  */
      74  
      75  #define _bfd_generic_hash_table(p) \
      76    ((struct generic_link_hash_table *) ((p)->hash))
      77  
      78  /* The generic linker reads in the asymbol structures for an input BFD
      79     and keeps them in the outsymbol and symcount fields.  */
      80  
      81  #define _bfd_generic_link_get_symbols(abfd)  ((abfd)->outsymbols)
      82  #define _bfd_generic_link_get_symcount(abfd) ((abfd)->symcount)
      83  
      84  /* Add the symbols of input_bfd to the symbols being built for
      85     output_bfd.  */
      86  extern bool _bfd_generic_link_output_symbols
      87    (bfd *, bfd *, struct bfd_link_info *, size_t *);
      88  
      89  /* This structure is used to pass information to
      90     _bfd_generic_link_write_global_symbol, which may be called via
      91     _bfd_generic_link_hash_traverse.  */
      92  
      93  struct generic_write_global_symbol_info
      94  {
      95    struct bfd_link_info *info;
      96    bfd *output_bfd;
      97    size_t *psymalloc;
      98  };
      99  
     100  /* Write out a single global symbol.  This is expected to be called
     101     via _bfd_generic_link_hash_traverse.  The second argument must
     102     actually be a struct generic_write_global_symbol_info *.  */
     103  extern bool _bfd_generic_link_write_global_symbol
     104    (struct generic_link_hash_entry *, void *);
     105  
     106  /* Generic link hash table entry creation routine.  */
     107  struct bfd_hash_entry *_bfd_generic_link_hash_newfunc
     108    (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
     109  
     110  #endif