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annotate lwasm/section.c @ 363:d96c30e60ddf
Added pass2 and various supporting logic including symbol lookups
| author | lost@starbug |
|---|---|
| date | Tue, 06 Apr 2010 21:03:19 -0600 |
| parents | 7166254491ed |
| children | 34dfc9747f23 |
| rev | line source |
|---|---|
| 353 | 1 /* |
| 2 section.c | |
| 3 | |
| 4 Copyright © 2010 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
| 22 #include <config.h> | |
| 23 | |
| 24 #include <string.h> | |
| 25 | |
| 26 #include <lw_string.h> | |
| 27 #include <lw_alloc.h> | |
| 28 | |
| 29 #include "lwasm.h" | |
| 30 #include "instab.h" | |
| 31 | |
| 32 PARSEFUNC(pseudo_parse_section) | |
| 33 { | |
| 34 char *p2; | |
| 35 char *sn; | |
| 36 char *opts = NULL; | |
| 37 sectiontab_t *s; | |
| 38 | |
| 39 if (as -> output_format != OUTPUT_OBJ) | |
| 40 { | |
| 41 lwasm_register_error(as, l, "Cannot use sections unless using the object target"); | |
| 42 return; | |
| 43 } | |
| 44 | |
| 45 if (!**p) | |
| 46 { | |
| 47 lwasm_register_error(as, l, "Need section name"); | |
| 48 return; | |
| 49 } | |
| 50 | |
| 51 if (as -> csect) | |
| 52 { | |
| 53 lw_expr_destroy(as -> csect -> offset); | |
| 54 as -> csect -> offset = l -> addr; | |
| 55 as -> csect = NULL; | |
| 56 } | |
| 57 | |
| 58 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++) | |
| 59 /* do nothing */ ; | |
| 60 | |
| 61 sn = lw_strndup(*p, p2 - *p); | |
| 62 *p = p2; | |
| 63 | |
| 64 if (**p == ',') | |
| 65 { | |
| 66 // have opts | |
| 67 (*p)++; | |
| 68 | |
| 69 for (p2 = *p; *p2 && !isspace(*p2); p2++) | |
| 70 /* do nothing */ ; | |
| 71 | |
| 72 opts = lw_strndup(*p, p2 - *p); | |
| 73 *p = p2; | |
| 74 } | |
| 75 | |
| 76 for (s = as -> sections; s; s = s -> next) | |
| 77 { | |
| 78 if (!strcmp(s -> name, sn)) | |
| 79 break; | |
| 80 } | |
| 81 if (s && opts) | |
| 82 { | |
| 83 lwasm_register_warning(as, l, "Section flags can only be specified the first time; ignoring duplicate definition"); | |
| 84 } | |
| 85 if (!s) | |
| 86 { | |
| 87 // create section data structure | |
| 88 s = lw_alloc(sizeof(sectiontab_t)); | |
| 89 s -> name = lw_strdup(sn); | |
| 90 s -> offset = lw_expr_build(lw_expr_type_int, 0); | |
| 91 s -> flags = section_flag_none; | |
| 92 if (!strcasecmp(sn, "bss") || !strcasecmp(sn, ".bss")) | |
| 93 { | |
| 94 s -> flags |= section_flag_bss; | |
| 95 } | |
| 96 // parse options | |
| 97 if (opts) | |
| 98 { | |
| 99 // only one option ("bss" or "!bss") | |
| 100 if (!strcasecmp(opts, "bss")) | |
| 101 { | |
| 102 s -> flags |= section_flag_bss; | |
| 103 } | |
| 104 else if (!strcasecmp(opts, "!bss")) | |
| 105 { | |
| 106 s -> flags &= ~section_flag_bss; | |
| 107 } | |
| 108 else | |
| 109 { | |
| 110 lwasm_register_error(as, l, "Unrecognized section flag"); | |
| 111 lw_free(sn); | |
| 112 lw_free(opts); | |
| 113 lw_free(s -> name); | |
| 114 lw_expr_destroy(s -> offset); | |
| 115 lw_free(s); | |
| 116 return; | |
| 117 } | |
| 118 } | |
| 119 s -> next = as -> sections; | |
| 120 as -> sections = s; | |
| 121 } | |
| 122 | |
| 123 lw_expr_destroy(l -> addr); | |
| 124 l -> addr = lw_expr_copy(s -> offset); | |
| 125 | |
| 126 as -> csect = s; | |
| 127 as -> context = lwasm_next_context(as); | |
| 128 | |
| 129 l -> len = 0; | |
| 130 | |
| 131 lw_free(opts); | |
| 132 lw_free(sn); | |
| 133 } | |
| 134 | |
| 135 PARSEFUNC(pseudo_parse_endsection) | |
| 136 { | |
| 137 if (as -> output_format != OUTPUT_OBJ) | |
| 138 { | |
| 139 lwasm_register_error(as, l, "Cannot use sections unless using the object target"); | |
| 140 return; | |
| 141 } | |
| 142 | |
| 143 if (!(as -> csect)) | |
| 144 { | |
| 145 lwasm_register_error(as, l, "ENDSECTION without SECTION"); | |
| 146 return; | |
| 147 } | |
| 148 | |
| 149 // save offset in case another instance of the section appears | |
| 150 lw_expr_destroy(as -> csect -> offset); | |
| 151 as -> csect -> offset = l -> addr; | |
| 152 | |
| 153 // reset address to 0 | |
| 154 l -> addr = lw_expr_build(lw_expr_type_int, 0); | |
| 155 as -> csect = NULL; | |
| 156 | |
| 157 // end of section is a context break | |
| 158 as -> context = lwasm_next_context(as); | |
| 159 | |
| 160 skip_operand(p); | |
| 161 } | |
| 356 | 162 |
| 163 PARSEFUNC(pseudo_parse_export) | |
| 164 { | |
| 165 int after = 0; | |
| 166 char *sym = NULL; | |
| 167 exportlist_t *e; | |
| 168 | |
| 169 if (as -> output_format != OUTPUT_OBJ) | |
| 170 { | |
| 171 lwasm_register_error(as, l, "EXPORT only supported for object target"); | |
| 172 return; | |
| 173 } | |
| 174 | |
| 175 if (l -> sym) | |
| 176 sym = lw_strdup(l -> sym); | |
| 177 | |
| 178 if (l -> sym) | |
| 179 { | |
| 180 skip_operand(p); | |
| 181 } | |
| 182 | |
| 183 again: | |
| 184 if (after || !sym) | |
| 185 { | |
| 186 char *p2; | |
| 187 | |
| 188 after = 1; | |
| 189 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++) | |
| 190 /* do nothing */ ; | |
| 191 | |
| 192 sym = lw_strndup(*p, p2 - *p); | |
| 193 } | |
| 194 if (!sym) | |
| 195 { | |
| 196 lwasm_register_error(as, l, "No symbol for EXPORT"); | |
| 197 return; | |
| 198 } | |
| 199 | |
| 200 // add the symbol to the "export" list (which will be resolved | |
| 201 // after the parse pass is complete | |
| 202 e = lw_alloc(sizeof(exportlist_t)); | |
| 203 e -> next = as -> exportlist; | |
| 204 e -> symbol = lw_strdup(sym); | |
|
363
d96c30e60ddf
Added pass2 and various supporting logic including symbol lookups
lost@starbug
parents:
356
diff
changeset
|
205 e -> line = l; |
| 356 | 206 as -> exportlist = e; |
| 207 lw_free(sym); | |
| 208 | |
| 209 if (after && **p == ',') | |
| 210 { | |
| 211 (*p)++; | |
| 212 for (; **p && isspace(**p); (*p)++) | |
| 213 /* do nothing */ ; | |
| 214 goto again; | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 PARSEFUNC(pseudo_parse_extern) | |
| 219 { | |
| 220 int after = 0; | |
| 221 char *sym = NULL; | |
| 222 importlist_t *e; | |
| 223 | |
| 224 if (as -> output_format != OUTPUT_OBJ) | |
| 225 { | |
| 226 lwasm_register_error(as, l, "IMPORT only supported for object target"); | |
| 227 return; | |
| 228 } | |
| 229 | |
| 230 if (l -> sym) | |
| 231 sym = lw_strdup(l -> sym); | |
| 232 | |
| 233 if (l -> sym) | |
| 234 { | |
| 235 skip_operand(p); | |
| 236 } | |
| 237 | |
| 238 again: | |
| 239 if (after || !sym) | |
| 240 { | |
| 241 char *p2; | |
| 242 | |
| 243 after = 1; | |
| 244 for (p2 = *p; *p2 && *p2 != ',' && !isspace(*p2); p2++) | |
| 245 /* do nothing */ ; | |
| 246 | |
| 247 sym = lw_strndup(*p, p2 - *p); | |
| 248 } | |
| 249 if (!sym) | |
| 250 { | |
| 251 lwasm_register_error(as, l, "No symbol for IMPORT"); | |
| 252 return; | |
| 253 } | |
| 254 | |
| 255 // add the symbol to the "export" list (which will be resolved | |
| 256 // after the parse pass is complete | |
| 257 e = lw_alloc(sizeof(importlist_t)); | |
| 258 e -> next = as -> importlist; | |
| 259 e -> symbol = lw_strdup(sym); | |
| 260 as -> importlist = e; | |
| 261 lw_free(sym); | |
| 262 | |
| 263 if (after && **p == ',') | |
| 264 { | |
| 265 (*p)++; | |
| 266 for (; **p && isspace(**p); (*p)++) | |
| 267 /* do nothing */ ; | |
| 268 goto again; | |
| 269 } | |
| 270 } |