| 1 | /* frags.h - Header file for the frag concept. |
| 2 | Copyright (C) 1987, 92, 93, 94, 95, 97, 98, 99, 2000 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GAS, the GNU Assembler. |
| 6 | |
| 7 | GAS is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GAS; see the file COPYING. If not, write to the Free |
| 19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 20 | 02111-1307, USA. */ |
| 21 | |
| 22 | #ifndef FRAGS_H |
| 23 | #define FRAGS_H |
| 24 | |
| 25 | #ifdef ANSI_PROTOTYPES |
| 26 | struct obstack; |
| 27 | #endif |
| 28 | |
| 29 | /* |
| 30 | * A code fragment (frag) is some known number of chars, followed by some |
| 31 | * unknown number of chars. Typically the unknown number of chars is an |
| 32 | * instruction address whose size is yet unknown. We always know the greatest |
| 33 | * possible size the unknown number of chars may become, and reserve that |
| 34 | * much room at the end of the frag. |
| 35 | * Once created, frags do not change address during assembly. |
| 36 | * We chain the frags in (a) forward-linked list(s). The object-file address |
| 37 | * of the 1st char of a frag is generally not known until after relax(). |
| 38 | * Many things at assembly time describe an address by {object-file-address |
| 39 | * of a particular frag}+offset. |
| 40 | |
| 41 | BUG: it may be smarter to have a single pointer off to various different |
| 42 | notes for different frag kinds. See how code pans |
| 43 | */ |
| 44 | |
| 45 | struct frag |
| 46 | { |
| 47 | /* Object file address (as an octet offset). */ |
| 48 | addressT fr_address; |
| 49 | /* Chain forward; ascending address order. Rooted in frch_root. */ |
| 50 | struct frag *fr_next; |
| 51 | |
| 52 | /* (Fixed) number of octets we know we have. May be 0. */ |
| 53 | offsetT fr_fix; |
| 54 | /* May be used for (Variable) number of octets after above. |
| 55 | The generic frag handling code no longer makes any use of fr_var. */ |
| 56 | offsetT fr_var; |
| 57 | /* For variable-length tail. */ |
| 58 | symbolS *fr_symbol; |
| 59 | /* For variable-length tail. */ |
| 60 | offsetT fr_offset; |
| 61 | /* Points to opcode low addr byte, for relaxation. */ |
| 62 | char *fr_opcode; |
| 63 | |
| 64 | #ifndef NO_LISTING |
| 65 | struct list_info_struct *line; |
| 66 | #endif |
| 67 | |
| 68 | /* What state is my tail in? */ |
| 69 | relax_stateT fr_type; |
| 70 | relax_substateT fr_subtype; |
| 71 | |
| 72 | #ifdef USING_CGEN |
| 73 | /* Don't include this unless using CGEN to keep frag size down. */ |
| 74 | struct { |
| 75 | /* CGEN_INSN entry for this instruction. */ |
| 76 | const struct cgen_insn *insn; |
| 77 | /* Index into operand table. */ |
| 78 | int opindex; |
| 79 | /* Target specific data, usually reloc number. */ |
| 80 | int opinfo; |
| 81 | } fr_cgen; |
| 82 | #endif |
| 83 | |
| 84 | #ifdef TC_FRAG_TYPE |
| 85 | TC_FRAG_TYPE tc_frag_data; |
| 86 | #endif |
| 87 | |
| 88 | /* Where the frag was created, or where it became a variant frag. */ |
| 89 | char *fr_file; |
| 90 | unsigned int fr_line; |
| 91 | |
| 92 | /* Data begins here. */ |
| 93 | char fr_literal[1]; |
| 94 | }; |
| 95 | |
| 96 | #define SIZEOF_STRUCT_FRAG \ |
| 97 | ((char *)zero_address_frag.fr_literal-(char *)&zero_address_frag) |
| 98 | /* We want to say fr_literal[0] above. */ |
| 99 | |
| 100 | /* Current frag we are building. This frag is incomplete. It is, |
| 101 | however, included in frchain_now. The fr_fix field is bogus; |
| 102 | instead, use frag_now_fix (). */ |
| 103 | COMMON fragS *frag_now; |
| 104 | extern addressT frag_now_fix PARAMS ((void)); |
| 105 | extern addressT frag_now_fix_octets PARAMS ((void)); |
| 106 | |
| 107 | /* For foreign-segment symbol fixups. */ |
| 108 | COMMON fragS zero_address_frag; |
| 109 | /* For local common (N_BSS segment) fixups. */ |
| 110 | COMMON fragS bss_address_frag; |
| 111 | |
| 112 | #if 0 |
| 113 | /* |
| 114 | * A macro to speed up appending exactly 1 char |
| 115 | * to current frag. |
| 116 | */ |
| 117 | /* JF changed < 1 to <= 1 to avoid a race conditon */ |
| 118 | #define FRAG_APPEND_1_CHAR(datum) \ |
| 119 | { \ |
| 120 | if (obstack_room( &frags ) <= 1) {\ |
| 121 | frag_wane (frag_now); \ |
| 122 | frag_new (0); \ |
| 123 | } \ |
| 124 | obstack_1grow( &frags, datum ); \ |
| 125 | } |
| 126 | #else |
| 127 | extern void frag_append_1_char PARAMS ((int)); |
| 128 | #define FRAG_APPEND_1_CHAR(X) frag_append_1_char (X) |
| 129 | #endif |
| 130 | |
| 131 | void frag_init PARAMS ((void)); |
| 132 | fragS *frag_alloc PARAMS ((struct obstack *)); |
| 133 | void frag_grow PARAMS ((unsigned int nchars)); |
| 134 | char *frag_more PARAMS ((int nchars)); |
| 135 | void frag_align PARAMS ((int alignment, int fill_character, int max)); |
| 136 | void frag_align_pattern PARAMS ((int alignment, |
| 137 | const char *fill_pattern, |
| 138 | int n_fill, |
| 139 | int max)); |
| 140 | void frag_new PARAMS ((int old_frags_var_max_size)); |
| 141 | void frag_wane PARAMS ((fragS * fragP)); |
| 142 | |
| 143 | char *frag_variant PARAMS ((relax_stateT type, |
| 144 | int max_chars, |
| 145 | int var, |
| 146 | relax_substateT subtype, |
| 147 | symbolS * symbol, |
| 148 | offsetT offset, |
| 149 | char *opcode)); |
| 150 | |
| 151 | char *frag_var PARAMS ((relax_stateT type, |
| 152 | int max_chars, |
| 153 | int var, |
| 154 | relax_substateT subtype, |
| 155 | symbolS * symbol, |
| 156 | offsetT offset, |
| 157 | char *opcode)); |
| 158 | |
| 159 | #endif /* FRAGS_H */ |