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19990502 sourceware import
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Richard Henderson
158
gas/frags.h
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158
gas/frags.h
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/* frags.h - Header file for the frag concept.
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Copyright (C) 1987, 92, 93, 94, 95, 97, 1998
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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, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifndef FRAGS_H
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#define FRAGS_H
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#ifdef ANSI_PROTOTYPES
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struct obstack;
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#endif
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/*
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* A code fragment (frag) is some known number of chars, followed by some
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* unknown number of chars. Typically the unknown number of chars is an
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* instruction address whose size is yet unknown. We always know the greatest
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* possible size the unknown number of chars may become, and reserve that
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* much room at the end of the frag.
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* Once created, frags do not change address during assembly.
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* We chain the frags in (a) forward-linked list(s). The object-file address
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* of the 1st char of a frag is generally not known until after relax().
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* Many things at assembly time describe an address by {object-file-address
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* of a particular frag}+offset.
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BUG: it may be smarter to have a single pointer off to various different
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notes for different frag kinds. See how code pans
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*/
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struct frag
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{
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/* Object file address. */
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addressT fr_address;
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/* Chain forward; ascending address order. Rooted in frch_root. */
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struct frag *fr_next;
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/* (Fixed) number of chars we know we have. May be 0. */
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offsetT fr_fix;
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/* (Variable) number of chars after above. May be 0. */
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offsetT fr_var;
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/* For variable-length tail. */
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struct symbol *fr_symbol;
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/* For variable-length tail. */
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offsetT fr_offset;
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/* Points to opcode low addr byte, for relaxation. */
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char *fr_opcode;
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#ifndef NO_LISTING
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struct list_info_struct *line;
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#endif
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/* What state is my tail in? */
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relax_stateT fr_type;
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relax_substateT fr_subtype;
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#ifdef USING_CGEN
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/* Don't include this unless using CGEN to keep frag size down. */
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struct {
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/* CGEN_INSN entry for this instruction. */
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const struct cgen_insn *insn;
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/* Index into operand table. */
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int opindex;
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/* Target specific data, usually reloc number. */
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int opinfo;
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} fr_cgen;
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#endif
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#ifdef TC_FRAG_TYPE
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TC_FRAG_TYPE tc_frag_data;
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#endif
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/* Where the frag was created, or where it became a variant frag. */
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char *fr_file;
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unsigned int fr_line;
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/* Data begins here. */
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char fr_literal[1];
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};
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#define SIZEOF_STRUCT_FRAG \
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((char *)zero_address_frag.fr_literal-(char *)&zero_address_frag)
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/* We want to say fr_literal[0] above. */
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/* Current frag we are building. This frag is incomplete. It is,
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however, included in frchain_now. The fr_fix field is bogus;
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instead, use frag_now_fix (). */
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COMMON fragS *frag_now;
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extern addressT frag_now_fix PARAMS ((void));
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/* For foreign-segment symbol fixups. */
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COMMON fragS zero_address_frag;
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/* For local common (N_BSS segment) fixups. */
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COMMON fragS bss_address_frag;
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#if 0
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/*
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* A macro to speed up appending exactly 1 char
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* to current frag.
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*/
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/* JF changed < 1 to <= 1 to avoid a race conditon */
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#define FRAG_APPEND_1_CHAR(datum) \
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{ \
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if (obstack_room( &frags ) <= 1) {\
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frag_wane (frag_now); \
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frag_new (0); \
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} \
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obstack_1grow( &frags, datum ); \
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}
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#else
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extern void frag_append_1_char PARAMS ((int));
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#define FRAG_APPEND_1_CHAR(X) frag_append_1_char (X)
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#endif
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void frag_init PARAMS ((void));
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fragS *frag_alloc PARAMS ((struct obstack *));
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void frag_grow PARAMS ((unsigned int nchars));
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char *frag_more PARAMS ((int nchars));
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void frag_align PARAMS ((int alignment, int fill_character, int max));
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void frag_align_pattern PARAMS ((int alignment,
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const char *fill_pattern,
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int n_fill,
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int max));
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void frag_new PARAMS ((int old_frags_var_max_size));
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void frag_wane PARAMS ((fragS * fragP));
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char *frag_variant PARAMS ((relax_stateT type,
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int max_chars,
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int var,
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relax_substateT subtype,
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symbolS * symbol,
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offsetT offset,
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char *opcode));
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char *frag_var PARAMS ((relax_stateT type,
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int max_chars,
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int var,
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relax_substateT subtype,
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symbolS * symbol,
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offsetT offset,
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char *opcode));
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#endif /* FRAGS_H */
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