/* struct_symbol.h - Internal symbol structure
- Copyright (C) 1987, 1992 Free Software Foundation, Inc.
+ 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 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,
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, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, 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
-
-/* our version of an nlist node */
-struct symbol
+struct symbol_flags
{
-#ifndef BFD_ASSEMBLER
- /* The (4-origin) position of sy_name in the symbol table of the object
- file. This will be 0 for (nameless) .stabd symbols.
+ /* 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;
+};
- Not used until write_object_file() time. */
- unsigned long sy_name_offset;
+/* The information we keep for a symbol. Note that the symbol table
+ holds pointers both to this and to local_symbol structures. See
+ below. */
- /* What we write in .o file (if permitted). */
- obj_symbol_type sy_symbol;
+struct symbol
+{
+ /* Symbol flags. */
+ struct symbol_flags sy_flags;
- /* The 24 bit symbol number. Symbol numbers start at 0 and are unsigned. */
- long sy_number;
-#else
/* BFD symbol */
asymbol *bsym;
-#endif
- struct symbol *sy_next; /* forward chain, or NULL */
-#ifdef SYMBOLS_NEED_BACKPOINTERS
- struct symbol *sy_previous; /* backward chain, or NULL */
-#endif /* SYMBOLS_NEED_BACKPOINTERS */
+ /* The value of the symbol. */
+ expressionS sy_value;
- struct frag *sy_frag; /* NULL or -> frag this symbol attaches to. */
+ /* Forwards and (optionally) backwards chain pointers. */
+ struct symbol *sy_next;
+ struct symbol *sy_previous;
- struct symbol *sy_forward; /* value is really that of this other symbol */
+ /* Pointer to the frag this symbol is attached to, if any.
+ Otherwise, NULL. */
+ struct frag *sy_frag;
- int written : 1;
+#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
};
-typedef struct symbol symbolS;
+/* 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.
-#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
+ 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. */
-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));
+struct local_symbol
+{
+ /* Symbol flags. Only sy_local_symbol and sy_resolved are relevant. */
+ struct symbol_flags lsy_flags;
-#define symbol_previous(s) ((s)->sy_previous)
+ /* 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;
-#else /* SYMBOLS_NEED_BACKPOINTERS */
+ /* The symbol name. */
+ const char *lsy_name;
-#define symbol_clear_list_pointers(clearme) {clearme->sy_next = NULL;}
+ /* The symbol frag or the real symbol, depending upon the value in
+ lsy_section. */
+ union
+ {
+ fragS *lsy_frag;
+ symbolS *lsy_sym;
+ } u;
-#endif /* SYMBOLS_NEED_BACKPOINTERS */
+ /* The value of the symbol. */
+ valueT lsy_value;
-void symbol_append PARAMS ((symbolS * addme, symbolS * target,
- symbolS ** rootP, symbolS ** lastP));
+#ifdef TC_LOCAL_SYMFIELD_TYPE
+ TC_LOCAL_SYMFIELD_TYPE lsy_tc;
+#endif
+};
-#define symbol_next(s) ((s)->sy_next)
+#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__ */
-
-/* end of struc-symbol.h */
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