9497f5ac6b
- allowing true forward references (which will always assume the referenced symbols have at the point of use) through the new .eqv pseudo-op and the new == operator - disallowing changing .equiv-generated equates (so that the protection this provides is both forward and backward) - snapshotting equates when their value gets changed so that previous uses don't get affected by the new value. - allowing expressions in places where absolute expressions (or register names) are needed which were not completely resolvable at the point of their definition but which are fully resolvable at the point of use In addition it fixes PR/288.
140 lines
4.6 KiB
C
140 lines
4.6 KiB
C
/* struct_symbol.h - Internal symbol structure
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Copyright 1987, 1992, 1993, 1994, 1995, 1998, 1999, 2000, 2001, 2005
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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 2, 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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/* 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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/* 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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unsigned int 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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#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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/* This pointer is always NULL to indicate that this is a local
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symbol. */
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asymbol *lsy_marker;
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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. If the symbol has been fully resolved, lsy_frag is
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set to NULL. */
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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)->u.lsy_frag == NULL)
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#define local_symbol_mark_resolved(l) ((l)->u.lsy_frag = NULL)
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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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