/* struct_symbol.h - Internal symbol structure
   Copyright (C) 1987 Free Software Foundation, Inc.

This file is part of GAS, the GNU Assembler.

GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

struct symbol			/* our version of an nlist node */
{
  obj_symbol_type sy_symbol;	/* what we write in .o file (if permitted) */
  unsigned long sy_name_offset;	/* 4-origin position of sy_name in symbols */
				/* part of object file. */
				/* 0 for (nameless) .stabd symbols. */
				/* Not used until write_object_file() time. */
  long	sy_number;	/* 24 bit symbol number. */
				/* Symbol numbers start at 0 and are */
				/* unsigned. */
  struct symbol *sy_next;	/* forward chain, or NULL */
#ifdef SYMBOLS_NEED_BACKPOINTERS
  struct symbol *sy_previous;	/* backward chain, or NULL */
#endif /* SYMBOLS_NEED_BACKPOINTERS */
  struct frag *sy_frag;	/* NULL or -> frag this symbol attaches to. */
  struct symbol *sy_forward;	/* value is really that of this other symbol */
/* We will probably want to add a sy_segment here soon. */
};

typedef struct symbol symbolS;

typedef unsigned valueT;	/* The type of n_value. Helps casting. */

#ifndef WORKING_DOT_WORD
struct broken_word {
	struct broken_word *next_broken_word;/* One of these strucs per .word x-y */
	fragS	*frag;		/* Which frag its in */
	char	*word_goes_here;/* Where in the frag it is */
	fragS	*dispfrag;	/* where to add the break */
	symbolS	*add;		/* symbol_x */
	symbolS	*sub;		/* - symbol_y */
	long	addnum;		/* + addnum */
	int	added;		/* nasty thing happend yet? */
				/* 1: added and has a long-jump */
				/* 2: added but uses someone elses long-jump */
	struct broken_word *use_jump; /* points to broken_word with a similar
					 long-jump */
};
extern struct broken_word *broken_words;
#endif /* ndef WORKING_DOT_WORD */

/*
 * Current means for getting from symbols to segments and vice verse.
 * This will change for infinite-segments support (e.g. COFF).
 */
/* #define	SYMBOL_TYPE_TO_SEGMENT(symP)  ( N_TYPE_seg [(int) (symP)->sy_type & N_TYPE] ) */
extern segT N_TYPE_seg[];		/* subseg.c */

#define	SEGMENT_TO_SYMBOL_TYPE(seg)  ( seg_N_TYPE [(int) (seg)] )
extern const short seg_N_TYPE[]; /* subseg.c */

#define	N_REGISTER	30	/* Fake N_TYPE value for SEG_REGISTER */

#ifdef SYMBOLS_NEED_BACKPOINTERS
#ifdef __STDC__

void symbol_clear_list_pointers(symbolS *symbolP);
void symbol_insert(symbolS *addme, symbolS *target, symbolS **rootP, symbolS **lastP);
void symbol_remove(symbolS *symbolP, symbolS **rootP, symbolS **lastP);
void verify_symbol_chain(symbolS *rootP, symbolS *lastP);

#else /* __STDC__ */

void symbol_clear_list_pointers();
void symbol_insert();
void symbol_remove();
void verify_symbol_chain();

#endif /* __STDC__ */

#define symbol_previous(s) ((s)->sy_previous)

#else /* SYMBOLS_NEED_BACKPOINTERS */

#define symbol_clear_list_pointers(clearme) {clearme->sy_next = NULL;}

#endif /* SYMBOLS_NEED_BACKPOINTERS */

#ifdef __STDC__
void symbol_append(symbolS *addme, symbolS *target, symbolS **rootP, symbolS **lastP);
#else /* __STDC__ */
void symbol_append();
#endif /* __STDC__ */

#define symbol_next(s)	((s)->sy_next)

/*
 * Local Variables:
 * comment-column: 0
 * fill-column: 131
 * End:
 */

/* end of struc-symbol.h */
