1 | /* frags.h - Header file for the frag concept. |
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2 | Copyright 1987, 1992, 1993, 1994, 1995, 1997, 1998, 1999, 2000, 2001 |
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3 | Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of GAS, the GNU Assembler. |
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6 | |
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7 | GAS is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 2, or (at your option) |
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10 | any later version. |
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11 | |
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12 | GAS is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with GAS; see the file COPYING. If not, write to the Free |
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19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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20 | 02111-1307, USA. */ |
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21 | |
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22 | #ifndef FRAGS_H |
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23 | #define FRAGS_H |
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24 | |
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25 | #ifdef ANSI_PROTOTYPES |
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26 | struct obstack; |
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27 | #endif |
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28 | |
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29 | /* A code fragment (frag) is some known number of chars, followed by some |
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30 | unknown number of chars. Typically the unknown number of chars is an |
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31 | instruction address whose size is yet unknown. We always know the greatest |
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32 | possible size the unknown number of chars may become, and reserve that |
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33 | much room at the end of the frag. |
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34 | Once created, frags do not change address during assembly. |
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35 | We chain the frags in (a) forward-linked list(s). The object-file address |
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36 | of the 1st char of a frag is generally not known until after relax(). |
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37 | Many things at assembly time describe an address by {object-file-address |
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38 | of a particular frag}+offset. |
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39 | |
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40 | BUG: it may be smarter to have a single pointer off to various different |
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41 | notes for different frag kinds. See how code pans. */ |
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42 | |
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43 | struct frag { |
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44 | /* Object file address (as an octet offset). */ |
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45 | addressT fr_address; |
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46 | /* Chain forward; ascending address order. Rooted in frch_root. */ |
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47 | struct frag *fr_next; |
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48 | |
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49 | /* (Fixed) number of octets we know we have. May be 0. */ |
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50 | offsetT fr_fix; |
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51 | /* May be used for (Variable) number of octets after above. |
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52 | The generic frag handling code no longer makes any use of fr_var. */ |
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53 | offsetT fr_var; |
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54 | /* For variable-length tail. */ |
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55 | symbolS *fr_symbol; |
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56 | /* For variable-length tail. */ |
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57 | offsetT fr_offset; |
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58 | /* Points to opcode low addr byte, for relaxation. */ |
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59 | char *fr_opcode; |
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60 | |
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61 | #ifndef NO_LISTING |
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62 | struct list_info_struct *line; |
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63 | #endif |
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64 | |
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65 | /* Flipped each relax pass so we can easily determine whether |
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66 | fr_address has been adjusted. */ |
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67 | unsigned int relax_marker:1; |
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68 | |
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69 | /* What state is my tail in? */ |
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70 | relax_stateT fr_type; |
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71 | relax_substateT fr_subtype; |
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72 | |
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73 | #ifdef USING_CGEN |
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74 | /* Don't include this unless using CGEN to keep frag size down. */ |
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75 | struct { |
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76 | /* CGEN_INSN entry for this instruction. */ |
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77 | const struct cgen_insn *insn; |
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78 | /* Index into operand table. */ |
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79 | int opindex; |
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80 | /* Target specific data, usually reloc number. */ |
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81 | int opinfo; |
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82 | } fr_cgen; |
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83 | #endif |
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84 | |
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85 | #ifdef TC_FRAG_TYPE |
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86 | TC_FRAG_TYPE tc_frag_data; |
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87 | #endif |
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88 | |
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89 | /* Where the frag was created, or where it became a variant frag. */ |
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90 | char *fr_file; |
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91 | unsigned int fr_line; |
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92 | |
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93 | /* Data begins here. */ |
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94 | char fr_literal[1]; |
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95 | }; |
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96 | |
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97 | #define SIZEOF_STRUCT_FRAG \ |
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98 | ((char *) zero_address_frag.fr_literal - (char *) &zero_address_frag) |
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99 | /* We want to say fr_literal[0] above. */ |
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100 | |
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101 | /* Current frag we are building. This frag is incomplete. It is, |
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102 | however, included in frchain_now. The fr_fix field is bogus; |
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103 | instead, use frag_now_fix (). */ |
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104 | COMMON fragS *frag_now; |
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105 | extern addressT frag_now_fix PARAMS ((void)); |
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106 | extern addressT frag_now_fix_octets PARAMS ((void)); |
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107 | |
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108 | /* For foreign-segment symbol fixups. */ |
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109 | COMMON fragS zero_address_frag; |
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110 | /* For local common (N_BSS segment) fixups. */ |
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111 | COMMON fragS bss_address_frag; |
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112 | |
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113 | #if 0 |
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114 | /* A macro to speed up appending exactly 1 char to current frag. */ |
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115 | /* JF changed < 1 to <= 1 to avoid a race conditon. */ |
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116 | #define FRAG_APPEND_1_CHAR(datum) \ |
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117 | { \ |
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118 | if (obstack_room (&frags) <= 1) \ |
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119 | { \ |
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120 | frag_wane (frag_now); \ |
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121 | frag_new (0); \ |
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122 | } \ |
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123 | obstack_1grow (&frags, datum); \ |
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124 | } |
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125 | #else |
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126 | extern void frag_append_1_char PARAMS ((int)); |
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127 | #define FRAG_APPEND_1_CHAR(X) frag_append_1_char (X) |
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128 | #endif |
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129 | |
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130 | void frag_init PARAMS ((void)); |
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131 | fragS *frag_alloc PARAMS ((struct obstack *)); |
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132 | void frag_grow PARAMS ((unsigned int nchars)); |
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133 | char *frag_more PARAMS ((int nchars)); |
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134 | void frag_align PARAMS ((int alignment, int fill_character, int max)); |
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135 | void frag_align_pattern PARAMS ((int alignment, |
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136 | const char *fill_pattern, |
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137 | int n_fill, |
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138 | int max)); |
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139 | void frag_align_code PARAMS ((int alignment, int max)); |
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140 | void frag_new PARAMS ((int old_frags_var_max_size)); |
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141 | void frag_wane PARAMS ((fragS * fragP)); |
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142 | |
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143 | char *frag_variant PARAMS ((relax_stateT type, |
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144 | int max_chars, |
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145 | int var, |
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146 | relax_substateT subtype, |
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147 | symbolS * symbol, |
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148 | offsetT offset, |
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149 | char *opcode)); |
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150 | |
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151 | char *frag_var PARAMS ((relax_stateT type, |
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152 | int max_chars, |
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153 | int var, |
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154 | relax_substateT subtype, |
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155 | symbolS * symbol, |
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156 | offsetT offset, |
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157 | char *opcode)); |
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158 | |
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159 | #endif /* FRAGS_H */ |
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