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/* struct_symbol.h - Internal symbol structure
Copyright (C) 1987-2016 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__ */
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