163 lines
5.0 KiB
C
163 lines
5.0 KiB
C
/* frags.h - Header file for the frag concept.
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Copyright 1987, 1992, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001
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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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/* 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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struct frag {
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/* Object file address (as an octet offset). */
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addressT fr_address;
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/* When relaxing multiple times, remember the address the frag had
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in the last relax pass. */
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addressT last_fr_address;
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/* (Fixed) number of octets we know we have. May be 0. */
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offsetT fr_fix;
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/* May be used for (Variable) number of octets after above.
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The generic frag handling code no longer makes any use of fr_var. */
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offsetT fr_var;
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/* For variable-length tail. */
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offsetT fr_offset;
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/* For variable-length tail. */
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symbolS *fr_symbol;
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/* Points to opcode low addr byte, for relaxation. */
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char *fr_opcode;
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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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/* 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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#ifndef NO_LISTING
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struct list_info_struct *line;
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#endif
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/* Flipped each relax pass so we can easily determine whether
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fr_address has been adjusted. */
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unsigned int relax_marker:1;
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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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/* 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 (void);
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extern addressT frag_now_fix_octets (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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/* A macro to speed up appending exactly 1 char to current frag. */
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/* JF changed < 1 to <= 1 to avoid a race condition. */
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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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{ \
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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 (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 (void);
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fragS *frag_alloc (struct obstack *);
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void frag_grow (unsigned int nchars);
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char *frag_more (int nchars);
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void frag_align (int alignment, int fill_character, int max);
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void frag_align_pattern (int alignment, const char *fill_pattern,
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int n_fill, int max);
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void frag_align_code (int alignment, int max);
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void frag_new (int old_frags_var_max_size);
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void frag_wane (fragS * fragP);
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int frag_room (void);
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char *frag_variant (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 (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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