/* struct_symbol.h - Internal symbol structure
- Copyright (C) 1987, 1992 Free Software Foundation, Inc.
+ Copyright 1987, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001
+ Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
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. */
+ along with GAS; see the file COPYING. If not, write to the Free
+ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
#ifndef __struc_symbol_h__
#define __struc_symbol_h__
#define SYMBOLS_NEED_BACKPOINTERS
#endif
-/* our version of an nlist node */
+/* The information we keep for a symbol. Note that the symbol table
+ holds pointers both to this and to local_symbol structures. See
+ below. */
+
struct symbol
{
-#ifndef BFD_ASSEMBLER
+#ifdef BFD_ASSEMBLER
+ /* BFD symbol */
+ asymbol *bsym;
+#else
/* The (4-origin) position of sy_name in the symbol table of the object
file. This will be 0 for (nameless) .stabd symbols.
- Not used until write_object_file() time. */
+ Not used until write_object_file() time. */
unsigned long sy_name_offset;
/* What we write in .o file (if permitted). */
obj_symbol_type sy_symbol;
- /* The 24 bit symbol number. Symbol numbers start at 0 and are unsigned. */
+ /* The 24 bit symbol number. Symbol numbers start at 0 and are unsigned. */
long sy_number;
-#else
- /* BFD symbol */
- asymbol *bsym;
#endif
/* The value of the symbol. */
expressionS sy_value;
- struct symbol *sy_next; /* forward chain, or NULL */
+ /* Forwards and (optionally) backwards chain pointers. */
+ struct symbol *sy_next;
#ifdef SYMBOLS_NEED_BACKPOINTERS
- struct symbol *sy_previous; /* backward chain, or NULL */
+ struct symbol *sy_previous;
#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 */
+ /* Pointer to the frag this symbol is attached to, if any.
+ Otherwise, NULL. */
+ struct frag *sy_frag;
+
+ unsigned int written : 1;
+ /* Whether symbol value has been completely resolved (used during
+ final pass over symbol table). */
+ unsigned int sy_resolved : 1;
+ /* Whether the symbol value is currently being resolved (used to
+ detect loops in symbol dependencies). */
+ unsigned int sy_resolving : 1;
+ /* Whether the symbol value is used in a reloc. This is used to
+ ensure that symbols used in relocs are written out, even if they
+ are local and would otherwise not be. */
+ unsigned int sy_used_in_reloc : 1;
+
+ /* Whether the symbol is used as an operand or in an expression.
+ NOTE: Not all the backends keep this information accurate;
+ backends which use this bit are responsible for setting it when
+ a symbol is used in backend routines. */
+ unsigned int sy_used : 1;
+
+ /* This is set if the symbol is defined in an MRI common section.
+ We handle such sections as single common symbols, so symbols
+ defined within them must be treated specially by the relocation
+ routines. */
+ unsigned int sy_mri_common : 1;
+
+#ifdef OBJ_SYMFIELD_TYPE
+ OBJ_SYMFIELD_TYPE sy_obj;
+#endif
- int written : 1;
+#ifdef TC_SYMFIELD_TYPE
+ TC_SYMFIELD_TYPE sy_tc;
+#endif
#ifdef TARGET_SYMBOL_FIELDS
TARGET_SYMBOL_FIELDS
#endif
};
-typedef struct symbol symbolS;
-
-#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 */
- offsetT 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 const 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 BFD_ASSEMBLER
-void symbol_clear_list_pointers PARAMS ((symbolS * symbolP));
-void symbol_insert PARAMS ((symbolS * addme, symbolS * target,
- symbolS ** rootP, symbolS ** lastP));
-void symbol_remove PARAMS ((symbolS * symbolP, symbolS ** rootP,
- symbolS ** lastP));
-void verify_symbol_chain PARAMS ((symbolS * rootP, symbolS * lastP));
+/* A pointer in the symbol may point to either a complete symbol
+ (struct symbol above) or to a local symbol (struct local_symbol
+ defined here). The symbol code can detect the case by examining
+ the first field. It is always NULL for a local symbol.
-#define symbol_previous(s) ((s)->sy_previous)
+ We do this because we ordinarily only need a small amount of
+ information for a local symbol. The symbol table takes up a lot of
+ space, and storing less information for a local symbol can make a
+ big difference in assembler memory usage when assembling a large
+ file. */
-#else /* SYMBOLS_NEED_BACKPOINTERS */
+struct local_symbol
+{
+ /* This pointer is always NULL to indicate that this is a local
+ symbol. */
+ asymbol *lsy_marker;
+
+ /* The symbol section. This also serves as a flag. If this is
+ reg_section, then this symbol has been converted into a regular
+ symbol, and lsy_sym points to it. */
+ segT lsy_section;
+
+ /* The symbol name. */
+ const char *lsy_name;
+
+ /* The symbol frag or the real symbol, depending upon the value in
+ lsy_section. If the symbol has been fully resolved, lsy_frag is
+ set to NULL. */
+ union
+ {
+ fragS *lsy_frag;
+ symbolS *lsy_sym;
+ } u;
-#define symbol_clear_list_pointers(clearme) {clearme->sy_next = NULL;}
+ /* The value of the symbol. */
+ valueT lsy_value;
-#endif /* SYMBOLS_NEED_BACKPOINTERS */
+#ifdef TC_LOCAL_SYMFIELD_TYPE
+ TC_LOCAL_SYMFIELD_TYPE lsy_tc;
+#endif
+};
-void symbol_append PARAMS ((symbolS * addme, symbolS * target,
- symbolS ** rootP, symbolS ** lastP));
+#define local_symbol_converted_p(l) ((l)->lsy_section == reg_section)
+#define local_symbol_mark_converted(l) ((l)->lsy_section = reg_section)
+#define local_symbol_resolved_p(l) ((l)->u.lsy_frag == NULL)
+#define local_symbol_mark_resolved(l) ((l)->u.lsy_frag = NULL)
+#define local_symbol_get_frag(l) ((l)->u.lsy_frag)
+#define local_symbol_set_frag(l, f) ((l)->u.lsy_frag = (f))
+#define local_symbol_get_real_symbol(l) ((l)->u.lsy_sym)
+#define local_symbol_set_real_symbol(l, s) ((l)->u.lsy_sym = (s))
-#define symbol_next(s) ((s)->sy_next)
+#endif /* BFD_ASSEMBLER */
#endif /* __struc_symbol_h__ */
-
-/* end of struc-symbol.h */
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