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annotate directive.c @ 98:51848a7584e0
__dead -> DEAD
| author | David A. Holland |
|---|---|
| date | Mon, 10 Jun 2013 23:48:21 -0400 |
| parents | 594495750d84 |
| children | 60184aa42604 |
| rev | line source |
|---|---|
| 30 | 1 /*- |
| 2 * Copyright (c) 2010 The NetBSD Foundation, Inc. | |
| 3 * All rights reserved. | |
| 4 * | |
| 5 * This code is derived from software contributed to The NetBSD Foundation | |
| 6 * by David A. Holland. | |
| 7 * | |
| 8 * Redistribution and use in source and binary forms, with or without | |
| 9 * modification, are permitted provided that the following conditions | |
| 10 * are met: | |
| 11 * 1. Redistributions of source code must retain the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer. | |
| 13 * 2. Redistributions in binary form must reproduce the above copyright | |
| 14 * notice, this list of conditions and the following disclaimer in the | |
| 15 * documentation and/or other materials provided with the distribution. | |
| 16 * | |
| 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS | |
| 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
| 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS | |
| 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 27 * POSSIBILITY OF SUCH DAMAGE. | |
| 28 */ | |
| 29 | |
| 15 | 30 #include <assert.h> |
| 31 #include <stdbool.h> | |
| 32 #include <stdlib.h> | |
| 33 #include <string.h> | |
| 34 | |
| 35 #include "utils.h" | |
| 36 #include "mode.h" | |
| 37 #include "place.h" | |
| 38 #include "files.h" | |
| 39 #include "directive.h" | |
| 40 #include "macro.h" | |
| 41 #include "eval.h" | |
|
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42 #include "output.h" |
| 15 | 43 |
| 44 struct ifstate { | |
| 45 struct ifstate *prev; | |
| 46 struct place startplace; | |
| 47 bool curtrue; | |
| 48 bool evertrue; | |
| 49 bool seenelse; | |
| 50 }; | |
| 51 | |
| 52 static struct ifstate *ifstate; | |
| 53 | |
| 54 //////////////////////////////////////////////////////////// | |
| 55 // common parsing bits | |
| 56 | |
| 57 static | |
| 58 void | |
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59 uncomment(char *buf) |
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60 { |
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61 char *s, *t, *u = NULL; |
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62 bool incomment = false; |
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63 bool inesc = false; |
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64 bool inquote = false; |
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65 |
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66 for (s = t = buf; *s; s++) { |
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67 if (incomment) { |
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68 if (s[0] == '*' && s[1] == '/') { |
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69 s++; |
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70 incomment = false; |
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71 } |
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72 } else { |
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73 if (!inquote && s[0] == '/' && s[1] == '*') { |
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74 incomment = true; |
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75 } else { |
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76 if (inesc) { |
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77 inesc = false; |
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78 } else if (s[0] == '\\') { |
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79 inesc = true; |
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80 } else if (s[0] == '"') { |
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81 inquote = !inquote; |
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82 } |
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83 |
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84 if (t != s) { |
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85 *t = *s; |
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86 } |
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87 if (!strchr(ws, *t)) { |
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88 u = t; |
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89 } |
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90 t++; |
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91 } |
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92 } |
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93 } |
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94 if (u) { |
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95 /* end string after last non-whitespace char */ |
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96 u[1] = '\0'; |
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97 } else { |
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98 *t = '\0'; |
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99 } |
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100 } |
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101 |
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102 static |
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103 void |
| 15 | 104 oneword(const char *what, struct place *p2, char *line) |
| 105 { | |
| 106 size_t pos; | |
| 107 | |
| 108 pos = strcspn(line, ws); | |
| 109 if (line[pos] != '\0') { | |
| 110 p2->column += pos; | |
| 111 complain(p2, "Garbage after %s argument", what); | |
| 112 complain_fail(); | |
| 113 line[pos] = '\0'; | |
| 114 } | |
| 115 } | |
| 116 | |
| 117 //////////////////////////////////////////////////////////// | |
| 118 // if handling | |
| 119 | |
| 120 static | |
| 121 struct ifstate * | |
| 122 ifstate_create(struct ifstate *prev, struct place *p, bool startstate) | |
| 123 { | |
| 124 struct ifstate *is; | |
| 125 | |
| 126 is = domalloc(sizeof(*is)); | |
| 127 is->prev = prev; | |
| 128 if (p != NULL) { | |
| 129 is->startplace = *p; | |
| 130 } else { | |
| 131 place_setbuiltin(&is->startplace, 1); | |
| 132 } | |
| 133 is->curtrue = startstate; | |
| 134 is->evertrue = is->curtrue; | |
| 135 is->seenelse = false; | |
| 136 return is; | |
| 137 } | |
| 138 | |
| 139 static | |
| 140 void | |
| 141 ifstate_destroy(struct ifstate *is) | |
| 142 { | |
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143 dofree(is, sizeof(*is)); |
| 15 | 144 } |
| 145 | |
| 146 static | |
| 147 void | |
| 148 ifstate_push(struct place *p, bool startstate) | |
| 149 { | |
| 72 | 150 struct ifstate *newstate; |
| 151 | |
| 152 newstate = ifstate_create(ifstate, p, startstate); | |
| 153 if (!ifstate->curtrue) { | |
| 154 newstate->curtrue = false; | |
| 155 newstate->evertrue = true; | |
| 156 } | |
| 157 ifstate = newstate; | |
| 15 | 158 } |
| 159 | |
| 160 static | |
| 161 void | |
| 162 ifstate_pop(void) | |
| 163 { | |
| 164 struct ifstate *is; | |
| 165 | |
| 166 is = ifstate; | |
| 167 ifstate = ifstate->prev; | |
| 168 ifstate_destroy(is); | |
| 169 } | |
| 170 | |
| 171 static | |
| 172 void | |
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173 d_if(struct place *p, struct place *p2, char *line) |
| 15 | 174 { |
| 175 char *expr; | |
| 176 bool val; | |
| 16 | 177 struct place p3 = *p2; |
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178 size_t oldlen; |
| 15 | 179 |
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180 expr = macroexpand(p2, line, strlen(line), true); |
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181 |
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182 oldlen = strlen(expr); |
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183 uncomment(expr); |
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184 /* trim to fit, so the malloc debugging won't complain */ |
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185 expr = dorealloc(expr, oldlen + 1, strlen(expr) + 1); |
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186 |
| 16 | 187 val = eval(&p3, expr); |
| 15 | 188 ifstate_push(p, val); |
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189 dostrfree(expr); |
| 15 | 190 } |
| 191 | |
| 192 static | |
| 193 void | |
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194 d_ifdef(struct place *p, struct place *p2, char *line) |
| 15 | 195 { |
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196 uncomment(line); |
| 15 | 197 oneword("#ifdef", p2, line); |
| 198 ifstate_push(p, macro_isdefined(line)); | |
| 199 } | |
| 200 | |
| 201 static | |
| 202 void | |
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203 d_ifndef(struct place *p, struct place *p2, char *line) |
| 15 | 204 { |
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205 uncomment(line); |
| 15 | 206 oneword("#ifndef", p2, line); |
| 207 ifstate_push(p, !macro_isdefined(line)); | |
| 208 } | |
| 209 | |
| 210 static | |
| 211 void | |
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212 d_elif(struct place *p, struct place *p2, char *line) |
| 15 | 213 { |
| 214 char *expr; | |
| 16 | 215 struct place p3 = *p2; |
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216 size_t oldlen; |
| 15 | 217 |
| 218 if (ifstate->seenelse) { | |
| 219 complain(p, "#elif after #else"); | |
| 220 complain_fail(); | |
| 221 } | |
| 222 | |
| 223 if (ifstate->evertrue) { | |
| 224 ifstate->curtrue = false; | |
| 225 } else { | |
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226 expr = macroexpand(p2, line, strlen(line), true); |
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227 |
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228 oldlen = strlen(expr); |
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229 uncomment(expr); |
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230 /* trim to fit, so the malloc debugging won't complain */ |
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231 expr = dorealloc(expr, oldlen + 1, strlen(expr) + 1); |
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232 |
| 16 | 233 ifstate->curtrue = eval(&p3, expr); |
| 15 | 234 ifstate->evertrue = ifstate->curtrue; |
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235 dostrfree(expr); |
| 15 | 236 } |
| 237 } | |
| 238 | |
| 239 static | |
| 240 void | |
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241 d_else(struct place *p, struct place *p2, char *line) |
| 15 | 242 { |
| 243 if (ifstate->seenelse) { | |
| 244 complain(p, "Multiple #else directives in one conditional"); | |
| 245 complain_fail(); | |
| 246 } | |
| 247 | |
| 248 ifstate->curtrue = !ifstate->evertrue; | |
| 249 ifstate->evertrue = true; | |
| 250 ifstate->seenelse = true; | |
| 251 } | |
| 252 | |
| 253 static | |
| 254 void | |
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255 d_endif(struct place *p, struct place *p2, char *line) |
| 15 | 256 { |
| 257 if (ifstate->prev == NULL) { | |
| 258 complain(p, "Unmatched #endif"); | |
| 259 complain_fail(); | |
| 260 } else { | |
| 261 ifstate_pop(); | |
| 262 } | |
| 263 } | |
| 264 | |
| 265 //////////////////////////////////////////////////////////// | |
| 266 // macros | |
| 267 | |
| 268 static | |
| 269 void | |
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270 d_define(struct place *p, struct place *p2, char *line) |
| 15 | 271 { |
| 18 | 272 size_t pos, argpos; |
| 273 struct place p3, p4; | |
| 15 | 274 |
| 275 /* | |
| 276 * line may be: | |
| 277 * macro expansion | |
| 278 * macro(arg, arg, ...) expansion | |
| 279 */ | |
| 280 | |
| 281 pos = strcspn(line, " \t\f\v("); | |
| 282 if (line[pos] == '(') { | |
| 18 | 283 line[pos++] = '\0'; |
| 284 argpos = pos; | |
| 15 | 285 pos = pos + strcspn(line+pos, "()"); |
| 286 if (line[pos] == '(') { | |
| 287 p2->column += pos; | |
| 288 complain(p2, "Left parenthesis in macro parameters"); | |
| 289 complain_fail(); | |
| 290 return; | |
| 291 } | |
| 292 if (line[pos] != ')') { | |
| 293 p2->column += pos; | |
| 294 complain(p2, "Unclosed macro parameter list"); | |
| 295 complain_fail(); | |
| 296 return; | |
| 297 } | |
| 18 | 298 line[pos++] = '\0'; |
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299 #if 0 |
| 15 | 300 if (!strchr(ws, line[pos])) { |
| 301 p2->column += pos; | |
| 302 complain(p2, "Trash after macro parameter list"); | |
| 303 complain_fail(); | |
| 304 return; | |
| 305 } | |
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306 #endif |
| 15 | 307 } else if (line[pos] == '\0') { |
| 18 | 308 argpos = 0; |
| 15 | 309 } else { |
| 310 line[pos++] = '\0'; | |
| 18 | 311 argpos = 0; |
| 15 | 312 } |
| 313 | |
| 314 pos += strspn(line+pos, ws); | |
| 315 | |
| 316 p3 = *p2; | |
| 18 | 317 p3.column += argpos; |
| 318 | |
| 319 p4 = *p2; | |
| 320 p4.column += pos; | |
| 321 | |
| 322 if (argpos) { | |
| 323 macro_define_params(p2, line, &p3, | |
| 324 line + argpos, &p4, | |
| 325 line + pos); | |
| 326 } else { | |
| 327 macro_define_plain(p2, line, &p4, line + pos); | |
| 328 } | |
| 15 | 329 } |
| 330 | |
| 331 static | |
| 332 void | |
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333 d_undef(struct place *p, struct place *p2, char *line) |
| 15 | 334 { |
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335 uncomment(line); |
| 15 | 336 oneword("#undef", p2, line); |
| 337 macro_undef(line); | |
| 338 } | |
| 339 | |
| 340 //////////////////////////////////////////////////////////// | |
| 341 // includes | |
| 342 | |
| 343 static | |
| 344 bool | |
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345 tryinclude(struct place *p, char *line) |
| 15 | 346 { |
|
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347 size_t len; |
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348 |
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349 len = strlen(line); |
| 15 | 350 if (len > 2 && line[0] == '"' && line[len-1] == '"') { |
| 351 line[len-1] = '\0'; | |
| 352 file_readquote(p, line+1); | |
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353 line[len-1] = '"'; |
| 15 | 354 return true; |
| 355 } | |
| 356 if (len > 2 && line[0] == '<' && line[len-1] == '>') { | |
| 357 line[len-1] = '\0'; | |
| 358 file_readbracket(p, line+1); | |
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359 line[len-1] = '>'; |
| 15 | 360 return true; |
| 361 } | |
| 362 return false; | |
| 363 } | |
| 364 | |
| 365 static | |
| 366 void | |
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367 d_include(struct place *p, struct place *p2, char *line) |
| 15 | 368 { |
| 369 char *text; | |
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370 size_t oldlen; |
| 15 | 371 |
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372 uncomment(line); |
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373 if (tryinclude(p, line)) { |
| 15 | 374 return; |
| 375 } | |
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376 text = macroexpand(p2, line, strlen(line), false); |
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377 |
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378 oldlen = strlen(text); |
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379 uncomment(text); |
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380 /* trim to fit, so the malloc debugging won't complain */ |
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381 text = dorealloc(text, oldlen + 1, strlen(text) + 1); |
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382 |
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383 if (tryinclude(p, text)) { |
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384 dostrfree(text); |
| 15 | 385 return; |
| 386 } | |
| 90 | 387 complain(p, "Illegal #include directive"); |
| 388 complain(p, "Before macro expansion: #include %s", line); | |
| 389 complain(p, "After macro expansion: #include %s", text); | |
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390 dostrfree(text); |
| 15 | 391 complain_fail(); |
| 392 } | |
| 393 | |
| 394 static | |
| 395 void | |
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396 d_line(struct place *p, struct place *p2, char *line) |
| 15 | 397 { |
| 398 /* XXX */ | |
| 399 complain(p, "Sorry, no #line yet"); | |
| 400 } | |
| 401 | |
| 402 //////////////////////////////////////////////////////////// | |
| 403 // messages | |
| 404 | |
| 405 static | |
| 406 void | |
|
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407 d_warning(struct place *p, struct place *p2, char *line) |
| 15 | 408 { |
| 409 char *msg; | |
| 410 | |
|
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411 msg = macroexpand(p2, line, strlen(line), false); |
| 15 | 412 complain(p, "#warning: %s", msg); |
| 413 if (mode.werror) { | |
| 414 complain_fail(); | |
| 415 } | |
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416 dostrfree(msg); |
| 15 | 417 } |
| 418 | |
| 419 static | |
| 420 void | |
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421 d_error(struct place *p, struct place *p2, char *line) |
| 15 | 422 { |
| 423 char *msg; | |
| 424 | |
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425 msg = macroexpand(p2, line, strlen(line), false); |
| 15 | 426 complain(p, "#error: %s", msg); |
| 427 complain_fail(); | |
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428 dostrfree(msg); |
| 15 | 429 } |
| 430 | |
| 431 //////////////////////////////////////////////////////////// | |
| 432 // other | |
| 433 | |
| 434 static | |
| 435 void | |
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436 d_pragma(struct place *p, struct place *p2, char *line) |
| 15 | 437 { |
| 438 complain(p, "#pragma %s", line); | |
| 439 complain_fail(); | |
| 440 } | |
| 441 | |
| 442 //////////////////////////////////////////////////////////// | |
| 443 // directive table | |
| 444 | |
| 445 static const struct { | |
| 446 const char *name; | |
| 447 bool ifskip; | |
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448 void (*func)(struct place *, struct place *, char *line); |
| 15 | 449 } directives[] = { |
| 450 { "define", true, d_define }, | |
| 451 { "elif", false, d_elif }, | |
| 452 { "else", false, d_else }, | |
| 453 { "endif", false, d_endif }, | |
| 454 { "error", true, d_error }, | |
| 455 { "if", false, d_if }, | |
| 456 { "ifdef", false, d_ifdef }, | |
| 457 { "ifndef", false, d_ifndef }, | |
| 458 { "include", true, d_include }, | |
| 459 { "line", true, d_line }, | |
| 460 { "pragma", true, d_pragma }, | |
| 461 { "undef", true, d_undef }, | |
| 462 { "warning", true, d_warning }, | |
| 463 }; | |
| 464 static const unsigned numdirectives = HOWMANY(directives); | |
| 465 | |
| 466 static | |
| 467 void | |
|
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468 directive_gotdirective(struct place *p, char *line) |
| 15 | 469 { |
| 470 struct place p2; | |
| 471 size_t len, skip; | |
| 472 unsigned i; | |
| 473 | |
| 474 p2 = *p; | |
| 475 for (i=0; i<numdirectives; i++) { | |
| 476 len = strlen(directives[i].name); | |
| 477 if (!strncmp(line, directives[i].name, len) && | |
| 478 strchr(ws, line[len])) { | |
| 479 if (directives[i].ifskip && !ifstate->curtrue) { | |
| 480 return; | |
| 481 } | |
| 482 skip = len + strspn(line+len, ws); | |
| 483 p2.column += skip; | |
| 484 line += skip; | |
|
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485 |
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486 len = strlen(line); |
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487 len = notrailingws(line, len); |
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488 if (len < strlen(line)) { |
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489 line[len] = '\0'; |
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490 } |
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491 directives[i].func(p, &p2, line); |
| 15 | 492 return; |
| 493 } | |
| 494 } | |
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495 /* ugh. allow # by itself, including with a comment after it */ |
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496 uncomment(line); |
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497 if (line[0] == '\0') { |
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498 return; |
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499 } |
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500 |
| 15 | 501 skip = strcspn(line, ws); |
| 502 complain(p, "Unknown directive #%.*s", (int)skip, line); | |
| 503 complain_fail(); | |
| 504 } | |
| 505 | |
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506 /* |
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507 * Check for nested comment delimiters in LINE. |
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508 */ |
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509 static |
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510 size_t |
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511 directive_scancomments(const struct place *p, char *line, size_t len) |
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512 { |
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513 size_t pos; |
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514 bool incomment; |
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515 struct place p2; |
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516 |
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517 p2 = *p; |
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518 incomment = 0; |
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519 for (pos = 0; pos+1 < len; pos++) { |
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520 if (line[pos] == '/' && line[pos+1] == '*') { |
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521 if (incomment) { |
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522 complain(&p2, "Warning: %c%c within comment", |
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523 '/', '*'); |
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524 if (mode.werror) { |
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525 complain_failed(); |
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526 } |
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527 } else { |
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528 incomment = true; |
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529 } |
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530 } else if (line[pos] == '*' && line[pos+1] == '/') { |
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531 if (incomment) { |
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532 incomment = false; |
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533 } else { |
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534 /* stray end-comment; should we care? */ |
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535 } |
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536 } |
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537 if (line[pos] == '\n') { |
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538 p2.line++; |
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539 p2.column = 0; |
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540 } else { |
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541 p2.column++; |
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542 } |
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543 } |
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544 |
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545 /* multiline comments are supposed to arrive in a single buffer */ |
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546 assert(!incomment); |
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547 return len; |
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548 } |
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549 |
| 15 | 550 void |
| 551 directive_gotline(struct place *p, char *line, size_t len) | |
| 552 { | |
| 553 size_t skip; | |
| 554 | |
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555 if (warns.nestcomment) { |
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556 directive_scancomments(p, line, len); |
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557 } |
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558 |
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559 /* check if we have a directive line (# exactly in column 0) */ |
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560 if (line[0] == '#') { |
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561 skip = 1 + strspn(line + 1, ws); |
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562 assert(skip <= len); |
| 15 | 563 p->column += skip; |
|
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564 assert(line[len] == '\0'); |
|
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565 directive_gotdirective(p, line+skip /*, length = len-skip */); |
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566 p->column += len-skip; |
| 15 | 567 } else if (ifstate->curtrue) { |
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568 macro_sendline(p, line, len); |
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569 p->column += len; |
| 15 | 570 } |
| 571 } | |
| 572 | |
| 573 void | |
| 574 directive_goteof(struct place *p) | |
| 575 { | |
| 576 while (ifstate->prev != NULL) { | |
| 577 complain(p, "Missing #endif"); | |
| 578 complain(&ifstate->startplace, "...opened at this point"); | |
| 579 complain_failed(); | |
| 580 ifstate_pop(); | |
| 581 } | |
| 582 macro_sendeof(p); | |
| 583 } | |
| 584 | |
| 585 //////////////////////////////////////////////////////////// | |
| 586 // module initialization | |
| 587 | |
| 588 void | |
| 589 directive_init(void) | |
| 590 { | |
| 591 ifstate = ifstate_create(NULL, NULL, true); | |
| 592 } | |
| 593 | |
| 594 void | |
| 595 directive_cleanup(void) | |
| 596 { | |
| 597 assert(ifstate->prev == NULL); | |
| 598 ifstate_destroy(ifstate); | |
| 599 ifstate = NULL; | |
| 600 } |