X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gas%2Fstruc-symbol.h;h=75735661bf2c01b22ebcf064b9ad4e59cf3d439d;hb=b4089fdd75a051bffc729255e2e383779abbb4ca;hp=2994f7f851e6eda78761fd1a615c270529023194;hpb=e98fe4f7b54cbdf29aef9287bbb1bea8801dd05a;p=deliverable%2Fbinutils-gdb.git diff --git a/gas/struc-symbol.h b/gas/struc-symbol.h index 2994f7f851..75735661bf 100644 --- a/gas/struc-symbol.h +++ b/gas/struc-symbol.h @@ -1,5 +1,5 @@ /* struct_symbol.h - Internal symbol structure - Copyright (C) 1987, 1992 Free Software Foundation, Inc. + Copyright (C) 1987, 92, 93, 94, 95, 98, 1999 Free Software Foundation, Inc. This file is part of GAS, the GNU Assembler. @@ -14,22 +14,23 @@ 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, 675 Mass Ave, Cambridge, MA 02139, USA. */ + 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. */ #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 +/* The information we keep for a symbol. Note that the symbol table + holds pointers both to this and to local_symbol structures. See + below. */ -/* our version of an nlist node */ struct symbol { -#ifndef BFD_ASSEMBLER +#ifdef BFD_ASSEMBLER + /* BFD symbol */ + asymbol *bsym; +#else /* The (4-origin) position of sy_name in the symbol table of the object file. This will be 0 for (nameless) .stabd symbols. @@ -41,84 +42,104 @@ struct 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; - struct symbol *sy_next; /* forward chain, or NULL */ + /* Forwards and (optionally) backwards chain pointers. */ + struct symbol *sy_next; #ifdef SYMBOLS_NEED_BACKPOINTERS - struct symbol *sy_previous; /* backward chain, or NULL */ + struct symbol *sy_previous; #endif /* SYMBOLS_NEED_BACKPOINTERS */ - struct frag *sy_frag; /* NULL or -> frag this symbol attaches to. */ - - struct symbol *sy_forward; /* value is really that of this other symbol */ - - int 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. + 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; + + /* 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; + +#ifdef OBJ_SYMFIELD_TYPE + OBJ_SYMFIELD_TYPE sy_obj; +#endif -#ifdef TARGET_SYMBOL_FIELDS - TARGET_SYMBOL_FIELDS +#ifdef TC_SYMFIELD_TYPE + TC_SYMFIELD_TYPE sy_tc; #endif }; -typedef struct symbol symbolS; - -#ifndef WORKING_DOT_WORD -struct broken_word - { - struct broken_word *next_broken_word; /* One of these strucs per .word x-y */ - fragS *frag; /* Which frag its in */ - char *word_goes_here; /* Where in the frag it is */ - fragS *dispfrag; /* where to add the break */ - symbolS *add; /* symbol_x */ - symbolS *sub; /* - symbol_y */ - offsetT addnum; /* + addnum */ - int added; /* nasty thing happend yet? */ - /* 1: added and has a long-jump */ - /* 2: added but uses someone elses long-jump */ - struct broken_word *use_jump; /* points to broken_word with a similar - long-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). - */ -/* #define SYMBOL_TYPE_TO_SEGMENT(symP) ( N_TYPE_seg [(int) (symP)->sy_type & N_TYPE] ) */ -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 */ - -#define N_REGISTER 30 /* Fake N_TYPE value for SEG_REGISTER */ - -#ifdef SYMBOLS_NEED_BACKPOINTERS - -void symbol_clear_list_pointers PARAMS ((symbolS * symbolP)); -void symbol_insert PARAMS ((symbolS * addme, symbolS * target, - symbolS ** rootP, symbolS ** lastP)); -void symbol_remove PARAMS ((symbolS * symbolP, symbolS ** rootP, - symbolS ** lastP)); -void verify_symbol_chain PARAMS ((symbolS * rootP, symbolS * lastP)); +#ifdef BFD_ASSEMBLER -#define symbol_previous(s) ((s)->sy_previous) +/* 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. -#else /* SYMBOLS_NEED_BACKPOINTERS */ + 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. */ -#define symbol_clear_list_pointers(clearme) {clearme->sy_next = NULL;} +struct local_symbol +{ + /* This pointer is always NULL to indicate that this is a local + symbol. */ + asymbol *lsy_marker; + + /* 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 sy_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 + sy_section. If the symbol has been fully resolved, lsy_frag is + set to NULL. */ + union + { + fragS *lsy_frag; + symbolS *lsy_sym; + } u; -#endif /* SYMBOLS_NEED_BACKPOINTERS */ + /* The offset within the frag. */ + valueT lsy_offset; +}; -void symbol_append PARAMS ((symbolS * addme, symbolS * target, - symbolS ** rootP, symbolS ** lastP)); +#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)->u.lsy_frag == NULL) +#define local_symbol_mark_resolved(l) ((l)->u.lsy_frag = NULL) +#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)) -#define symbol_next(s) ((s)->sy_next) +#endif /* BFD_ASSEMBLER */ #endif /* __struc_symbol_h__ */