160 lines
5.1 KiB
C
160 lines
5.1 KiB
C
/* struct_symbol.h - Internal symbol structure
|
|
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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA
|
|
02110-1301, USA. */
|
|
|
|
#ifndef __struc_symbol_h__
|
|
#define __struc_symbol_h__
|
|
|
|
struct symbol_flags
|
|
{
|
|
/* Wether the symbol is a local_symbol. */
|
|
unsigned int sy_local_symbol : 1;
|
|
|
|
/* Wether symbol has been written. */
|
|
unsigned int sy_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;
|
|
|
|
/* 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
|
|
|
|
#ifdef TC_SYMFIELD_TYPE
|
|
TC_SYMFIELD_TYPE sy_tc;
|
|
#endif
|
|
|
|
#ifdef TARGET_SYMBOL_FIELDS
|
|
TARGET_SYMBOL_FIELDS
|
|
#endif
|
|
};
|
|
|
|
/* 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.
|
|
|
|
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. */
|
|
|
|
struct local_symbol
|
|
{
|
|
/* Symbol flags. Only sy_local_symbol and sy_resolved are relevant. */
|
|
struct symbol_flags lsy_flags;
|
|
|
|
/* 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. */
|
|
union
|
|
{
|
|
fragS *lsy_frag;
|
|
symbolS *lsy_sym;
|
|
} u;
|
|
|
|
/* The value of the symbol. */
|
|
valueT lsy_value;
|
|
|
|
#ifdef TC_LOCAL_SYMFIELD_TYPE
|
|
TC_LOCAL_SYMFIELD_TYPE lsy_tc;
|
|
#endif
|
|
};
|
|
|
|
#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__ */
|