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Diffstat (limited to 'gas/frags.h')
| -rw-r--r-- | gas/frags.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/gas/frags.h b/gas/frags.h new file mode 100644 index 0000000000..9590292a4d --- /dev/null +++ b/gas/frags.h @@ -0,0 +1,158 @@ +/* frags.h - Header file for the frag concept. + Copyright (C) 1987, 92, 93, 94, 95, 97, 1998 + 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) + any later version. + + GAS is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + 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, 59 Temple Place - Suite 330, Boston, MA + 02111-1307, USA. */ + +#ifndef FRAGS_H +#define FRAGS_H + +#ifdef ANSI_PROTOTYPES +struct obstack; +#endif + +/* + * A code fragment (frag) is some known number of chars, followed by some + * unknown number of chars. Typically the unknown number of chars is an + * instruction address whose size is yet unknown. We always know the greatest + * possible size the unknown number of chars may become, and reserve that + * much room at the end of the frag. + * Once created, frags do not change address during assembly. + * We chain the frags in (a) forward-linked list(s). The object-file address + * of the 1st char of a frag is generally not known until after relax(). + * Many things at assembly time describe an address by {object-file-address + * of a particular frag}+offset. + + BUG: it may be smarter to have a single pointer off to various different + notes for different frag kinds. See how code pans + */ + +struct frag +{ + /* Object file address. */ + addressT fr_address; + /* Chain forward; ascending address order. Rooted in frch_root. */ + struct frag *fr_next; + + /* (Fixed) number of chars we know we have. May be 0. */ + offsetT fr_fix; + /* (Variable) number of chars after above. May be 0. */ + offsetT fr_var; + /* For variable-length tail. */ + struct symbol *fr_symbol; + /* For variable-length tail. */ + offsetT fr_offset; + /* Points to opcode low addr byte, for relaxation. */ + char *fr_opcode; + +#ifndef NO_LISTING + struct list_info_struct *line; +#endif + + /* What state is my tail in? */ + relax_stateT fr_type; + relax_substateT fr_subtype; + +#ifdef USING_CGEN + /* Don't include this unless using CGEN to keep frag size down. */ + struct { + /* CGEN_INSN entry for this instruction. */ + const struct cgen_insn *insn; + /* Index into operand table. */ + int opindex; + /* Target specific data, usually reloc number. */ + int opinfo; + } fr_cgen; +#endif + +#ifdef TC_FRAG_TYPE + TC_FRAG_TYPE tc_frag_data; +#endif + + /* Where the frag was created, or where it became a variant frag. */ + char *fr_file; + unsigned int fr_line; + + /* Data begins here. */ + char fr_literal[1]; +}; + +#define SIZEOF_STRUCT_FRAG \ +((char *)zero_address_frag.fr_literal-(char *)&zero_address_frag) +/* We want to say fr_literal[0] above. */ + +/* Current frag we are building. This frag is incomplete. It is, + however, included in frchain_now. The fr_fix field is bogus; + instead, use frag_now_fix (). */ +COMMON fragS *frag_now; +extern addressT frag_now_fix PARAMS ((void)); + +/* For foreign-segment symbol fixups. */ +COMMON fragS zero_address_frag; +/* For local common (N_BSS segment) fixups. */ +COMMON fragS bss_address_frag; + +#if 0 +/* + * A macro to speed up appending exactly 1 char + * to current frag. + */ +/* JF changed < 1 to <= 1 to avoid a race conditon */ +#define FRAG_APPEND_1_CHAR(datum) \ +{ \ + if (obstack_room( &frags ) <= 1) {\ + frag_wane (frag_now); \ + frag_new (0); \ + } \ + obstack_1grow( &frags, datum ); \ +} +#else +extern void frag_append_1_char PARAMS ((int)); +#define FRAG_APPEND_1_CHAR(X) frag_append_1_char (X) +#endif + + +void frag_init PARAMS ((void)); +fragS *frag_alloc PARAMS ((struct obstack *)); +void frag_grow PARAMS ((unsigned int nchars)); +char *frag_more PARAMS ((int nchars)); +void frag_align PARAMS ((int alignment, int fill_character, int max)); +void frag_align_pattern PARAMS ((int alignment, + const char *fill_pattern, + int n_fill, + int max)); +void frag_new PARAMS ((int old_frags_var_max_size)); +void frag_wane PARAMS ((fragS * fragP)); + +char *frag_variant PARAMS ((relax_stateT type, + int max_chars, + int var, + relax_substateT subtype, + symbolS * symbol, + offsetT offset, + char *opcode)); + +char *frag_var PARAMS ((relax_stateT type, + int max_chars, + int var, + relax_substateT subtype, + symbolS * symbol, + offsetT offset, + char *opcode)); + +#endif /* FRAGS_H */ |