struc-symbol.h revision 60484
133965Sjdp/* struct_symbol.h - Internal symbol structure 260484Sobrien Copyright (C) 1987, 92, 93, 94, 95, 98, 1999 Free Software Foundation, Inc. 333965Sjdp 433965Sjdp This file is part of GAS, the GNU Assembler. 533965Sjdp 633965Sjdp GAS is free software; you can redistribute it and/or modify 733965Sjdp it under the terms of the GNU General Public License as published by 833965Sjdp the Free Software Foundation; either version 2, or (at your option) 933965Sjdp any later version. 1033965Sjdp 1133965Sjdp GAS is distributed in the hope that it will be useful, 1233965Sjdp but WITHOUT ANY WARRANTY; without even the implied warranty of 1333965Sjdp MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1433965Sjdp GNU General Public License for more details. 1533965Sjdp 1633965Sjdp You should have received a copy of the GNU General Public License 1760484Sobrien along with GAS; see the file COPYING. If not, write to the Free 1860484Sobrien Software Foundation, 59 Temple Place - Suite 330, Boston, MA 1960484Sobrien 02111-1307, USA. */ 2033965Sjdp 2133965Sjdp#ifndef __struc_symbol_h__ 2233965Sjdp#define __struc_symbol_h__ 2333965Sjdp 2460484Sobrien/* The information we keep for a symbol. Note that the symbol table 2560484Sobrien holds pointers both to this and to local_symbol structures. See 2660484Sobrien below. */ 2733965Sjdp 2833965Sjdpstruct symbol 2933965Sjdp{ 3060484Sobrien#ifdef BFD_ASSEMBLER 3160484Sobrien /* BFD symbol */ 3260484Sobrien asymbol *bsym; 3360484Sobrien#else 3433965Sjdp /* The (4-origin) position of sy_name in the symbol table of the object 3533965Sjdp file. This will be 0 for (nameless) .stabd symbols. 3633965Sjdp 3733965Sjdp Not used until write_object_file() time. */ 3833965Sjdp unsigned long sy_name_offset; 3933965Sjdp 4033965Sjdp /* What we write in .o file (if permitted). */ 4133965Sjdp obj_symbol_type sy_symbol; 4233965Sjdp 4333965Sjdp /* The 24 bit symbol number. Symbol numbers start at 0 and are unsigned. */ 4433965Sjdp long sy_number; 4533965Sjdp#endif 4633965Sjdp 4733965Sjdp /* The value of the symbol. */ 4833965Sjdp expressionS sy_value; 4933965Sjdp 5033965Sjdp /* Forwards and (optionally) backwards chain pointers. */ 5133965Sjdp struct symbol *sy_next; 5233965Sjdp#ifdef SYMBOLS_NEED_BACKPOINTERS 5333965Sjdp struct symbol *sy_previous; 5433965Sjdp#endif /* SYMBOLS_NEED_BACKPOINTERS */ 5533965Sjdp 5633965Sjdp /* Pointer to the frag this symbol is attached to, if any. 5733965Sjdp Otherwise, NULL. */ 5833965Sjdp struct frag *sy_frag; 5933965Sjdp 6033965Sjdp unsigned int written : 1; 6133965Sjdp /* Whether symbol value has been completely resolved (used during 6233965Sjdp final pass over symbol table). */ 6333965Sjdp unsigned int sy_resolved : 1; 6433965Sjdp /* Whether the symbol value is currently being resolved (used to 6533965Sjdp detect loops in symbol dependencies). */ 6633965Sjdp unsigned int sy_resolving : 1; 6733965Sjdp /* Whether the symbol value is used in a reloc. This is used to 6833965Sjdp ensure that symbols used in relocs are written out, even if they 6933965Sjdp are local and would otherwise not be. */ 7033965Sjdp unsigned int sy_used_in_reloc : 1; 7133965Sjdp 7233965Sjdp /* Whether the symbol is used as an operand or in an expression. 7333965Sjdp NOTE: Not all the backends keep this information accurate; 7433965Sjdp backends which use this bit are responsible for setting it when 7533965Sjdp a symbol is used in backend routines. */ 7633965Sjdp unsigned int sy_used : 1; 7733965Sjdp 7833965Sjdp /* This is set if the symbol is defined in an MRI common section. 7933965Sjdp We handle such sections as single common symbols, so symbols 8033965Sjdp defined within them must be treated specially by the relocation 8133965Sjdp routines. */ 8233965Sjdp unsigned int sy_mri_common : 1; 8333965Sjdp 8433965Sjdp#ifdef OBJ_SYMFIELD_TYPE 8533965Sjdp OBJ_SYMFIELD_TYPE sy_obj; 8633965Sjdp#endif 8733965Sjdp 8833965Sjdp#ifdef TC_SYMFIELD_TYPE 8933965Sjdp TC_SYMFIELD_TYPE sy_tc; 9033965Sjdp#endif 9133965Sjdp}; 9233965Sjdp 9360484Sobrien#ifdef BFD_ASSEMBLER 9433965Sjdp 9560484Sobrien/* A pointer in the symbol may point to either a complete symbol 9660484Sobrien (struct symbol above) or to a local symbol (struct local_symbol 9760484Sobrien defined here). The symbol code can detect the case by examining 9860484Sobrien the first field. It is always NULL for a local symbol. 9933965Sjdp 10060484Sobrien We do this because we ordinarily only need a small amount of 10160484Sobrien information for a local symbol. The symbol table takes up a lot of 10260484Sobrien space, and storing less information for a local symbol can make a 10360484Sobrien big difference in assembler memory usage when assembling a large 10460484Sobrien file. */ 10533965Sjdp 10660484Sobrienstruct local_symbol 10760484Sobrien{ 10860484Sobrien /* This pointer is always NULL to indicate that this is a local 10960484Sobrien symbol. */ 11060484Sobrien asymbol *lsy_marker; 11133965Sjdp 11260484Sobrien /* The symbol section. This also serves as a flag. If this is 11360484Sobrien reg_section, then this symbol has been converted into a regular 11460484Sobrien symbol, and sy_sym points to it. */ 11560484Sobrien segT lsy_section; 11633965Sjdp 11760484Sobrien /* The symbol name. */ 11860484Sobrien const char *lsy_name; 11933965Sjdp 12060484Sobrien /* The symbol frag or the real symbol, depending upon the value in 12160484Sobrien sy_section. If the symbol has been fully resolved, lsy_frag is 12260484Sobrien set to NULL. */ 12360484Sobrien union 12460484Sobrien { 12560484Sobrien fragS *lsy_frag; 12660484Sobrien symbolS *lsy_sym; 12760484Sobrien } u; 12833965Sjdp 12960484Sobrien /* The offset within the frag. */ 13060484Sobrien valueT lsy_offset; 13160484Sobrien}; 13233965Sjdp 13360484Sobrien#define local_symbol_converted_p(l) ((l)->lsy_section == reg_section) 13460484Sobrien#define local_symbol_mark_converted(l) ((l)->lsy_section = reg_section) 13560484Sobrien#define local_symbol_resolved_p(l) ((l)->u.lsy_frag == NULL) 13660484Sobrien#define local_symbol_mark_resolved(l) ((l)->u.lsy_frag = NULL) 13760484Sobrien#define local_symbol_get_frag(l) ((l)->u.lsy_frag) 13860484Sobrien#define local_symbol_set_frag(l, f) ((l)->u.lsy_frag = (f)) 13960484Sobrien#define local_symbol_get_real_symbol(l) ((l)->u.lsy_sym) 14060484Sobrien#define local_symbol_set_real_symbol(l, s) ((l)->u.lsy_sym = (s)) 14133965Sjdp 14260484Sobrien#endif /* BFD_ASSEMBLER */ 14333965Sjdp 14433965Sjdp#endif /* __struc_symbol_h__ */ 14533965Sjdp 14633965Sjdp/* end of struc-symbol.h */ 147