struc-symbol.h revision 89857
133965Sjdp/* struct_symbol.h - Internal symbol structure 278828Sobrien Copyright 1987, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001 377298Sobrien Free Software Foundation, Inc. 433965Sjdp 533965Sjdp This file is part of GAS, the GNU Assembler. 633965Sjdp 733965Sjdp GAS is free software; you can redistribute it and/or modify 833965Sjdp it under the terms of the GNU General Public License as published by 933965Sjdp the Free Software Foundation; either version 2, or (at your option) 1033965Sjdp any later version. 1133965Sjdp 1233965Sjdp GAS is distributed in the hope that it will be useful, 1333965Sjdp but WITHOUT ANY WARRANTY; without even the implied warranty of 1433965Sjdp MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1533965Sjdp GNU General Public License for more details. 1633965Sjdp 1733965Sjdp You should have received a copy of the GNU General Public License 1860484Sobrien along with GAS; see the file COPYING. If not, write to the Free 1960484Sobrien Software Foundation, 59 Temple Place - Suite 330, Boston, MA 2060484Sobrien 02111-1307, USA. */ 2133965Sjdp 2233965Sjdp#ifndef __struc_symbol_h__ 2333965Sjdp#define __struc_symbol_h__ 2433965Sjdp 2577298Sobrien#ifdef BFD_ASSEMBLER 2677298Sobrien/* The BFD code wants to walk the list in both directions. */ 2777298Sobrien#undef SYMBOLS_NEED_BACKPOINTERS 2877298Sobrien#define SYMBOLS_NEED_BACKPOINTERS 2977298Sobrien#endif 3077298Sobrien 3160484Sobrien/* The information we keep for a symbol. Note that the symbol table 3260484Sobrien holds pointers both to this and to local_symbol structures. See 3360484Sobrien below. */ 3433965Sjdp 3533965Sjdpstruct symbol 3633965Sjdp{ 3760484Sobrien#ifdef BFD_ASSEMBLER 3860484Sobrien /* BFD symbol */ 3960484Sobrien asymbol *bsym; 4060484Sobrien#else 4133965Sjdp /* The (4-origin) position of sy_name in the symbol table of the object 4233965Sjdp file. This will be 0 for (nameless) .stabd symbols. 4333965Sjdp 4477298Sobrien Not used until write_object_file() time. */ 4533965Sjdp unsigned long sy_name_offset; 4633965Sjdp 4733965Sjdp /* What we write in .o file (if permitted). */ 4833965Sjdp obj_symbol_type sy_symbol; 4933965Sjdp 5077298Sobrien /* The 24 bit symbol number. Symbol numbers start at 0 and are unsigned. */ 5133965Sjdp long sy_number; 5233965Sjdp#endif 5333965Sjdp 5433965Sjdp /* The value of the symbol. */ 5533965Sjdp expressionS sy_value; 5633965Sjdp 5733965Sjdp /* Forwards and (optionally) backwards chain pointers. */ 5833965Sjdp struct symbol *sy_next; 5933965Sjdp#ifdef SYMBOLS_NEED_BACKPOINTERS 6033965Sjdp struct symbol *sy_previous; 6133965Sjdp#endif /* SYMBOLS_NEED_BACKPOINTERS */ 6233965Sjdp 6333965Sjdp /* Pointer to the frag this symbol is attached to, if any. 6433965Sjdp Otherwise, NULL. */ 6533965Sjdp struct frag *sy_frag; 6633965Sjdp 6733965Sjdp unsigned int written : 1; 6833965Sjdp /* Whether symbol value has been completely resolved (used during 6933965Sjdp final pass over symbol table). */ 7033965Sjdp unsigned int sy_resolved : 1; 7133965Sjdp /* Whether the symbol value is currently being resolved (used to 7233965Sjdp detect loops in symbol dependencies). */ 7333965Sjdp unsigned int sy_resolving : 1; 7433965Sjdp /* Whether the symbol value is used in a reloc. This is used to 7533965Sjdp ensure that symbols used in relocs are written out, even if they 7633965Sjdp are local and would otherwise not be. */ 7733965Sjdp unsigned int sy_used_in_reloc : 1; 7833965Sjdp 7977298Sobrien /* Whether the symbol is used as an operand or in an expression. 8033965Sjdp NOTE: Not all the backends keep this information accurate; 8133965Sjdp backends which use this bit are responsible for setting it when 8233965Sjdp a symbol is used in backend routines. */ 8333965Sjdp unsigned int sy_used : 1; 8433965Sjdp 8533965Sjdp /* This is set if the symbol is defined in an MRI common section. 8633965Sjdp We handle such sections as single common symbols, so symbols 8733965Sjdp defined within them must be treated specially by the relocation 8833965Sjdp routines. */ 8933965Sjdp unsigned int sy_mri_common : 1; 9033965Sjdp 9133965Sjdp#ifdef OBJ_SYMFIELD_TYPE 9233965Sjdp OBJ_SYMFIELD_TYPE sy_obj; 9333965Sjdp#endif 9433965Sjdp 9533965Sjdp#ifdef TC_SYMFIELD_TYPE 9633965Sjdp TC_SYMFIELD_TYPE sy_tc; 9733965Sjdp#endif 9877298Sobrien 9977298Sobrien#ifdef TARGET_SYMBOL_FIELDS 10077298Sobrien TARGET_SYMBOL_FIELDS 10177298Sobrien#endif 10233965Sjdp}; 10333965Sjdp 10460484Sobrien#ifdef BFD_ASSEMBLER 10533965Sjdp 10660484Sobrien/* A pointer in the symbol may point to either a complete symbol 10760484Sobrien (struct symbol above) or to a local symbol (struct local_symbol 10860484Sobrien defined here). The symbol code can detect the case by examining 10960484Sobrien the first field. It is always NULL for a local symbol. 11033965Sjdp 11160484Sobrien We do this because we ordinarily only need a small amount of 11260484Sobrien information for a local symbol. The symbol table takes up a lot of 11360484Sobrien space, and storing less information for a local symbol can make a 11460484Sobrien big difference in assembler memory usage when assembling a large 11560484Sobrien file. */ 11633965Sjdp 11760484Sobrienstruct local_symbol 11860484Sobrien{ 11960484Sobrien /* This pointer is always NULL to indicate that this is a local 12060484Sobrien symbol. */ 12160484Sobrien asymbol *lsy_marker; 12233965Sjdp 12360484Sobrien /* The symbol section. This also serves as a flag. If this is 12460484Sobrien reg_section, then this symbol has been converted into a regular 12589857Sobrien symbol, and lsy_sym points to it. */ 12660484Sobrien segT lsy_section; 12733965Sjdp 12860484Sobrien /* The symbol name. */ 12960484Sobrien const char *lsy_name; 13033965Sjdp 13160484Sobrien /* The symbol frag or the real symbol, depending upon the value in 13289857Sobrien lsy_section. If the symbol has been fully resolved, lsy_frag is 13360484Sobrien set to NULL. */ 13460484Sobrien union 13560484Sobrien { 13660484Sobrien fragS *lsy_frag; 13760484Sobrien symbolS *lsy_sym; 13860484Sobrien } u; 13933965Sjdp 14089857Sobrien /* The value of the symbol. */ 14189857Sobrien valueT lsy_value; 14289857Sobrien 14389857Sobrien#ifdef TC_LOCAL_SYMFIELD_TYPE 14489857Sobrien TC_LOCAL_SYMFIELD_TYPE lsy_tc; 14589857Sobrien#endif 14660484Sobrien}; 14733965Sjdp 14860484Sobrien#define local_symbol_converted_p(l) ((l)->lsy_section == reg_section) 14960484Sobrien#define local_symbol_mark_converted(l) ((l)->lsy_section = reg_section) 15060484Sobrien#define local_symbol_resolved_p(l) ((l)->u.lsy_frag == NULL) 15160484Sobrien#define local_symbol_mark_resolved(l) ((l)->u.lsy_frag = NULL) 15260484Sobrien#define local_symbol_get_frag(l) ((l)->u.lsy_frag) 15360484Sobrien#define local_symbol_set_frag(l, f) ((l)->u.lsy_frag = (f)) 15460484Sobrien#define local_symbol_get_real_symbol(l) ((l)->u.lsy_sym) 15560484Sobrien#define local_symbol_set_real_symbol(l, s) ((l)->u.lsy_sym = (s)) 15633965Sjdp 15760484Sobrien#endif /* BFD_ASSEMBLER */ 15833965Sjdp 15933965Sjdp#endif /* __struc_symbol_h__ */ 160