gas/struc-symbol.h

   1 /* struct_symbol.h - Internal symbol structure
   2    Copyright (C) 1987, 1992 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    oYou should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifndef __struc_symbol_h__
  21 #define __struc_symbol_h__
  22
  23 struct symbol                   /* our version of an nlist node */
  24 {
  25   obj_symbol_type sy_symbol;    /* what we write in .o file (if permitted) */
  26   unsigned long sy_name_offset; /* 4-origin position of sy_name in symbols */
  27   /* part of object file. */
  28   /* 0 for (nameless) .stabd symbols. */
  29   /* Not used until write_object_file() time. */
  30   long sy_number;               /* 24 bit symbol number. */
  31   /* Symbol numbers start at 0 and are */
  32   /* unsigned. */
  33   struct symbol *sy_next;       /* forward chain, or NULL */
  34 #ifdef SYMBOLS_NEED_BACKPOINTERS
  35   struct symbol *sy_previous;   /* backward chain, or NULL */
  36 #endif /* SYMBOLS_NEED_BACKPOINTERS */
  37   struct frag *sy_frag;         /* NULL or -> frag this symbol attaches to. */
  38   struct symbol *sy_forward;    /* value is really that of this other symbol */
  39   /* We will probably want to add a sy_segment here soon. */
  40 };
  41
  42 typedef struct symbol symbolS;
  43
  44 typedef unsigned valueT;        /* The type of n_value. Helps casting. */
  45
  46 #ifndef WORKING_DOT_WORD
  47 struct broken_word
  48   {
  49     struct broken_word *next_broken_word;       /* One of these strucs per .word x-y */
  50     fragS *frag;                /* Which frag its in */
  51     char *word_goes_here;       /* Where in the frag it is */
  52     fragS *dispfrag;            /* where to add the break */
  53     symbolS *add;               /* symbol_x */
  54     symbolS *sub;               /* - symbol_y */
  55     long addnum;                /* + addnum */
  56     int added;                  /* nasty thing happend yet? */
  57     /* 1: added and has a long-jump */
  58     /* 2: added but uses someone elses long-jump */
  59     struct broken_word *use_jump;       /* points to broken_word with a similar
  60                                          long-jump */
  61   };
  62 extern struct broken_word *broken_words;
  63 #endif /* ndef WORKING_DOT_WORD */
  64
  65 /*
  66  * Current means for getting from symbols to segments and vice verse.
  67  * This will change for infinite-segments support (e.g. COFF).
  68  */
  69 /* #define      SYMBOL_TYPE_TO_SEGMENT(symP)  ( N_TYPE_seg [(int) (symP)->sy_type & N_TYPE] ) */
  70 extern segT N_TYPE_seg[];       /* subseg.c */
  71
  72 #define SEGMENT_TO_SYMBOL_TYPE(seg)  ( seg_N_TYPE [(int) (seg)] )
  73 extern const short seg_N_TYPE[];/* subseg.c */
  74
  75 #define N_REGISTER      30      /* Fake N_TYPE value for SEG_REGISTER */
  76
  77 #ifdef SYMBOLS_NEED_BACKPOINTERS
  78 #if __STDC__ == 1
  79
  80 void symbol_clear_list_pointers (symbolS * symbolP);
  81 void symbol_insert (symbolS * addme, symbolS * target, symbolS ** rootP, symbolS ** lastP);
  82 void symbol_remove (symbolS * symbolP, symbolS ** rootP, symbolS ** lastP);
  83 void verify_symbol_chain (symbolS * rootP, symbolS * lastP);
  84
  85 #else /* not __STDC__ */
  86
  87 void symbol_clear_list_pointers ();
  88 void symbol_insert ();
  89 void symbol_remove ();
  90 void verify_symbol_chain ();
  91
  92 #endif /* not __STDC__ */
  93
  94 #define symbol_previous(s) ((s)->sy_previous)
  95
  96 #else /* SYMBOLS_NEED_BACKPOINTERS */
  97
  98 #define symbol_clear_list_pointers(clearme) {clearme->sy_next = NULL;}
  99
 100 #endif /* SYMBOLS_NEED_BACKPOINTERS */
 101
 102 #if __STDC__ == 1
 103 void symbol_append (symbolS * addme, symbolS * target, symbolS ** rootP, symbolS ** lastP);
 104 #else /* not __STDC__ */
 105 void symbol_append ();
 106 #endif /* not __STDC__ */
 107
 108 #define symbol_next(s)  ((s)->sy_next)
 109
 110 #endif /* __struc_symbol_h__ */
 111
 112 /*
 113  * Local Variables:
 114  * comment-column: 0
 115  * fill-column: 131
 116  * End:
 117  */
 118
 119 /* end of struc-symbol.h */