| /* 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 */ |