159 lines
5.0 KiB
C
159 lines
5.0 KiB
C
/* struct_symbol.h - Internal symbol structure
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Copyright (C) 1987-2015 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef __struc_symbol_h__
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#define __struc_symbol_h__
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struct symbol_flags
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{
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/* Wether the symbol is a local_symbol. */
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unsigned int sy_local_symbol : 1;
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/* Wether symbol has been written. */
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unsigned int sy_written : 1;
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/* Whether symbol value has been completely resolved (used during
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final pass over symbol table). */
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unsigned int sy_resolved : 1;
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/* Whether the symbol value is currently being resolved (used to
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detect loops in symbol dependencies). */
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unsigned int sy_resolving : 1;
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/* Whether the symbol value is used in a reloc. This is used to
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ensure that symbols used in relocs are written out, even if they
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are local and would otherwise not be. */
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unsigned int sy_used_in_reloc : 1;
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/* Whether the symbol is used as an operand or in an expression.
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NOTE: Not all the backends keep this information accurate;
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backends which use this bit are responsible for setting it when
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a symbol is used in backend routines. */
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unsigned int sy_used : 1;
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/* Whether the symbol can be re-defined. */
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unsigned int sy_volatile : 1;
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/* Whether the symbol is a forward reference. */
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unsigned int sy_forward_ref : 1;
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/* This is set if the symbol is defined in an MRI common section.
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We handle such sections as single common symbols, so symbols
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defined within them must be treated specially by the relocation
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routines. */
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unsigned int sy_mri_common : 1;
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/* This is set if the symbol is set with a .weakref directive. */
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unsigned int sy_weakrefr : 1;
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/* This is set when the symbol is referenced as part of a .weakref
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directive, but only if the symbol was not in the symbol table
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before. It is cleared as soon as any direct reference to the
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symbol is present. */
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unsigned int sy_weakrefd : 1;
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};
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/* The information we keep for a symbol. Note that the symbol table
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holds pointers both to this and to local_symbol structures. See
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below. */
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struct symbol
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{
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/* Symbol flags. */
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struct symbol_flags sy_flags;
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/* BFD symbol */
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asymbol *bsym;
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/* The value of the symbol. */
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expressionS sy_value;
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/* Forwards and (optionally) backwards chain pointers. */
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struct symbol *sy_next;
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struct symbol *sy_previous;
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/* Pointer to the frag this symbol is attached to, if any.
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Otherwise, NULL. */
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struct frag *sy_frag;
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#ifdef OBJ_SYMFIELD_TYPE
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OBJ_SYMFIELD_TYPE sy_obj;
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#endif
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#ifdef TC_SYMFIELD_TYPE
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TC_SYMFIELD_TYPE sy_tc;
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#endif
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#ifdef TARGET_SYMBOL_FIELDS
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TARGET_SYMBOL_FIELDS
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#endif
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};
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/* A pointer in the symbol may point to either a complete symbol
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(struct symbol above) or to a local symbol (struct local_symbol
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defined here). The symbol code can detect the case by examining
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the first field. It is always NULL for a local symbol.
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We do this because we ordinarily only need a small amount of
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information for a local symbol. The symbol table takes up a lot of
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space, and storing less information for a local symbol can make a
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big difference in assembler memory usage when assembling a large
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file. */
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struct local_symbol
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{
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/* Symbol flags. Only sy_local_symbol and sy_resolved are relevant. */
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struct symbol_flags lsy_flags;
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/* The symbol section. This also serves as a flag. If this is
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reg_section, then this symbol has been converted into a regular
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symbol, and lsy_sym points to it. */
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segT lsy_section;
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/* The symbol name. */
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const char *lsy_name;
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/* The symbol frag or the real symbol, depending upon the value in
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lsy_section. */
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union
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{
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fragS *lsy_frag;
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symbolS *lsy_sym;
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} u;
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/* The value of the symbol. */
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valueT lsy_value;
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#ifdef TC_LOCAL_SYMFIELD_TYPE
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TC_LOCAL_SYMFIELD_TYPE lsy_tc;
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#endif
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};
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#define local_symbol_converted_p(l) ((l)->lsy_section == reg_section)
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#define local_symbol_mark_converted(l) ((l)->lsy_section = reg_section)
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#define local_symbol_resolved_p(l) ((l)->lsy_flags.sy_resolved)
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#define local_symbol_mark_resolved(l) ((l)->lsy_flags.sy_resolved = 1)
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#define local_symbol_get_frag(l) ((l)->u.lsy_frag)
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#define local_symbol_set_frag(l, f) ((l)->u.lsy_frag = (f))
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#define local_symbol_get_real_symbol(l) ((l)->u.lsy_sym)
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#define local_symbol_set_real_symbol(l, s) ((l)->u.lsy_sym = (s))
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#endif /* __struc_symbol_h__ */
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