/* struct_symbol.h - Internal symbol structure
- Copyright (C) 1987, 92, 93, 94, 95, 1998 Free Software Foundation, Inc.
+ Copyright 1987, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2005,
+ 2007, 2008, 2009 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 2, or (at your option)
+ the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
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, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
#ifndef __struc_symbol_h__
#define __struc_symbol_h__
-#ifdef BFD_ASSEMBLER
-/* The BFD code wants to walk the list in both directions. */
-#undef SYMBOLS_NEED_BACKPOINTERS
-#define SYMBOLS_NEED_BACKPOINTERS
-#endif
-
-/* our version of an nlist node */
-struct symbol
+struct symbol_flags
{
-#ifndef BFD_ASSEMBLER
- /* 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. */
- unsigned long sy_name_offset;
+ /* Wether the symbol is a local_symbol. */
+ unsigned int sy_local_symbol : 1;
- /* 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. */
- long sy_number;
-#else
- /* BFD symbol */
- asymbol *bsym;
-#endif
-
- /* The value of the symbol. */
- expressionS sy_value;
-
- /* Forwards and (optionally) backwards chain pointers. */
- struct symbol *sy_next;
-#ifdef SYMBOLS_NEED_BACKPOINTERS
- struct symbol *sy_previous;
-#endif /* SYMBOLS_NEED_BACKPOINTERS */
+ /* Wether symbol has been written. */
+ unsigned int sy_written : 1;
- /* 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.
+ /* 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;
+ /* Whether the symbol can be re-defined. */
+ unsigned int sy_volatile : 1;
+
+ /* Whether the symbol is a forward reference. */
+ unsigned int sy_forward_ref : 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;
+ /* This is set if the symbol is set with a .weakref directive. */
+ unsigned int sy_weakrefr : 1;
+
+ /* This is set when the symbol is referenced as part of a .weakref
+ directive, but only if the symbol was not in the symbol table
+ before. It is cleared as soon as any direct reference to the
+ symbol is present. */
+ unsigned int sy_weakrefd : 1;
+};
+
+/* 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
+{
+ /* Symbol flags. */
+ struct symbol_flags sy_flags;
+
+ /* BFD symbol */
+ asymbol *bsym;
+
+ /* The value of the symbol. */
+ expressionS sy_value;
+
+ /* Forwards and (optionally) backwards chain pointers. */
+ struct symbol *sy_next;
+ struct symbol *sy_previous;
+
+ /* Pointer to the frag this symbol is attached to, if any.
+ Otherwise, NULL. */
+ struct frag *sy_frag;
+
#ifdef OBJ_SYMFIELD_TYPE
OBJ_SYMFIELD_TYPE sy_obj;
#endif
#endif
};
-typedef struct symbol symbolS;
-
-#ifndef WORKING_DOT_WORD
-struct broken_word
- {
- /* Linked list -- one of these structures per ".word x-y+C"
- expression. */
- struct broken_word *next_broken_word;
- /* Segment and subsegment for broken word. */
- segT seg;
- subsegT subseg;
- /* Which frag is this broken word in? */
- fragS *frag;
- /* Where in the frag is it? */
- char *word_goes_here;
- /* Where to add the break. */
- fragS *dispfrag; /* where to add the break */
- /* Operands of expression. */
- symbolS *add;
- symbolS *sub;
- offsetT addnum;
-
- int added; /* nasty thing happend yet? */
- /* 1: added and has a long-jump */
- /* 2: added but uses someone elses long-jump */
-
- /* Pointer to broken_word with a similar long-jump. */
- struct broken_word *use_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).
- */
-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 */
+/* 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 N_REGISTER 30 /* Fake N_TYPE value for SEG_REGISTER */
+ 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. */
-void symbol_clear_list_pointers PARAMS ((symbolS * symbolP));
-
-#ifdef SYMBOLS_NEED_BACKPOINTERS
+struct local_symbol
+{
+ /* Symbol flags. Only sy_local_symbol and sy_resolved are relevant. */
+ struct symbol_flags lsy_flags;
-void symbol_insert PARAMS ((symbolS * addme, symbolS * target,
- symbolS ** rootP, symbolS ** lastP));
-void symbol_remove PARAMS ((symbolS * symbolP, symbolS ** rootP,
- symbolS ** lastP));
+ /* 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;
-#define symbol_previous(s) ((s)->sy_previous)
+ /* The symbol name. */
+ const char *lsy_name;
-#endif /* SYMBOLS_NEED_BACKPOINTERS */
+ /* The symbol frag or the real symbol, depending upon the value in
+ lsy_section. */
+ union
+ {
+ fragS *lsy_frag;
+ symbolS *lsy_sym;
+ } u;
-void verify_symbol_chain PARAMS ((symbolS * rootP, symbolS * lastP));
-void verify_symbol_chain_2 PARAMS ((symbolS * symP));
+ /* The value of the symbol. */
+ valueT lsy_value;
-void symbol_append PARAMS ((symbolS * addme, symbolS * target,
- symbolS ** rootP, symbolS ** lastP));
+#ifdef TC_LOCAL_SYMFIELD_TYPE
+ TC_LOCAL_SYMFIELD_TYPE lsy_tc;
+#endif
+};
-#define symbol_next(s) ((s)->sy_next)
+#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)->lsy_flags.sy_resolved)
+#define local_symbol_mark_resolved(l) ((l)->lsy_flags.sy_resolved = 1)
+#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))
#endif /* __struc_symbol_h__ */
-
-/* end of struc-symbol.h */
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