/* struct_symbol.h - Internal symbol structure
- Copyright (C) 1987 Free Software Foundation, Inc.
-
+ Copyright (C) 1987-2018 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 2, or (at your option)
+ 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.
-
- oYou 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. */
-struct symbol /* our version of an nlist node */
-{
- obj_symbol_type sy_symbol; /* what we write in .o file (if permitted) */
- unsigned long sy_name_offset; /* 4-origin position of sy_name in symbols */
- /* part of object file. */
- /* 0 for (nameless) .stabd symbols. */
- /* Not used until write_object_file() time. */
- long sy_number; /* 24 bit symbol number. */
- /* Symbol numbers start at 0 and are */
- /* unsigned. */
- struct symbol *sy_next; /* forward chain, or NULL */
-#ifdef SYMBOLS_NEED_BACKPOINTERS
- struct symbol *sy_previous; /* backward chain, or NULL */
-#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 */
- /* We will probably want to add a sy_segment here soon. */
-};
-
-typedef struct symbol symbolS;
-
-typedef unsigned valueT; /* The type of n_value. Helps casting. */
-
-#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 */
- long 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 */
+ 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. */
-/*
- * 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 segT N_TYPE_seg[]; /* subseg.c */
+#ifndef __struc_symbol_h__
+#define __struc_symbol_h__
-#define SEGMENT_TO_SYMBOL_TYPE(seg) ( seg_N_TYPE [(int) (seg)] )
-extern const short seg_N_TYPE[]; /* subseg.c */
+struct symbol_flags
+{
+ /* Whether the symbol is a local_symbol. */
+ unsigned int sy_local_symbol : 1;
+
+ /* Weather 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;
+};
-#define N_REGISTER 30 /* Fake N_TYPE value for SEG_REGISTER */
+/* The information we keep for a symbol. Note that the symbol table
+ holds pointers both to this and to local_symbol structures. See
+ below. */
-#ifdef SYMBOLS_NEED_BACKPOINTERS
-#ifdef __STDC__
+struct symbol
+{
+ /* Symbol flags. */
+ struct symbol_flags sy_flags;
-void symbol_clear_list_pointers(symbolS *symbolP);
-void symbol_insert(symbolS *addme, symbolS *target, symbolS **rootP, symbolS **lastP);
-void symbol_remove(symbolS *symbolP, symbolS **rootP, symbolS **lastP);
-void verify_symbol_chain(symbolS *rootP, symbolS *lastP);
+ /* BFD symbol */
+ asymbol *bsym;
-#else /* __STDC__ */
+ /* The value of the symbol. */
+ expressionS sy_value;
-void symbol_clear_list_pointers();
-void symbol_insert();
-void symbol_remove();
-void verify_symbol_chain();
+ /* Forwards and (optionally) backwards chain pointers. */
+ struct symbol *sy_next;
+ struct symbol *sy_previous;
-#endif /* __STDC__ */
+ /* Pointer to the frag this symbol is attached to, if any.
+ Otherwise, NULL. */
+ struct frag *sy_frag;
-#define symbol_previous(s) ((s)->sy_previous)
+#ifdef OBJ_SYMFIELD_TYPE
+ OBJ_SYMFIELD_TYPE sy_obj;
+#endif
-#else /* SYMBOLS_NEED_BACKPOINTERS */
+#ifdef TC_SYMFIELD_TYPE
+ TC_SYMFIELD_TYPE sy_tc;
+#endif
-#define symbol_clear_list_pointers(clearme) {clearme->sy_next = NULL;}
+#ifdef TARGET_SYMBOL_FIELDS
+ TARGET_SYMBOL_FIELDS
+#endif
+};
-#endif /* SYMBOLS_NEED_BACKPOINTERS */
+/* 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.
-#ifdef __STDC__
-void symbol_append(symbolS *addme, symbolS *target, symbolS **rootP, symbolS **lastP);
-#else /* __STDC__ */
-void symbol_append();
-#endif /* __STDC__ */
+ 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_next(s) ((s)->sy_next)
+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
+};
-/*
- * Local Variables:
- * comment-column: 0
- * fill-column: 131
- * End:
- */
+#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))
-/* end of struc-symbol.h */
+#endif /* __struc_symbol_h__ */
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