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| 1 | +#include <u.h> | |
| 2 | +#include <libc.h> | |
| 3 | +#include <stdio.h> | |
| 4 | +#include <stdarg.h> | |
| 5 | +#include "cpp.h" | |
| 6 | + | |
| 7 | +#define OUTS 16384 | |
| 8 | +char outbuf[OUTS]; | |
| 9 | +char *outp = outbuf; | |
| 10 | +Source *cursource; | |
| 11 | +int nerrs; | |
| 12 | +struct token nltoken = { NL, 0, 0, 0, 1, (uchar*)"\n" }; | |
| 13 | +char *curtime; | |
| 14 | +int incdepth; | |
| 15 | +int ifdepth; | |
| 16 | +int ifsatisfied[NIF]; | |
| 17 | +int skipping; | |
| 18 | + | |
| 19 | +void | |
| 20 | +main(int argc, char **argv) | |
| 21 | +{ | |
| 22 | + Tokenrow tr; | |
| 23 | + long t; | |
| 24 | + char ebuf[BUFSIZ]; | |
| 25 | + | |
| 26 | + setbuf(stderr, ebuf); | |
| 27 | + t = time(NULL); | |
| 28 | + curtime = ctime(t); | |
| 29 | + maketokenrow(3, &tr); | |
| 30 | + expandlex(); | |
| 31 | + setup(argc, argv); | |
| 32 | + fixlex(); | |
| 33 | + iniths(); | |
| 34 | + genline(); | |
| 35 | + process(&tr); | |
| 36 | + flushout(); | |
| 37 | + fflush(stderr); | |
| 38 | + exits(nerrs? "errors" : 0); | |
| 39 | +} | |
| 40 | + | |
| 41 | +void | |
| 42 | +process(Tokenrow *trp) | |
| 43 | +{ | |
| 44 | + int anymacros = 0; | |
| 45 | + | |
| 46 | + for (;;) { | |
| 47 | + if (trp->tp >= trp->lp) { | |
| 48 | + trp->tp = trp->lp = trp->bp; | |
| 49 | + outp = outbuf; | |
| 50 | + anymacros |= gettokens(trp, 1); | |
| 51 | + trp->tp = trp->bp; | |
| 52 | + } | |
| 53 | + if (trp->tp->type == END) { | |
| 54 | + if (--incdepth>=0) { | |
| 55 | + if (cursource->ifdepth) | |
| 56 | + error(ERROR, | |
| 57 | + "Unterminated conditional in #include"); | |
| 58 | + unsetsource(); | |
| 59 | + cursource->line += cursource->lineinc; | |
| 60 | + trp->tp = trp->lp; | |
| 61 | + genline(); | |
| 62 | + continue; | |
| 63 | + } | |
| 64 | + if (ifdepth) | |
| 65 | + error(ERROR, "Unterminated #if/#ifdef/#ifndef"); | |
| 66 | + break; | |
| 67 | + } | |
| 68 | + if (trp->tp->type==SHARP) { | |
| 69 | + trp->tp += 1; | |
| 70 | + control(trp); | |
| 71 | + } else if (!skipping && anymacros) | |
| 72 | + expandrow(trp, NULL); | |
| 73 | + if (skipping) | |
| 74 | + setempty(trp); | |
| 75 | + puttokens(trp); | |
| 76 | + anymacros = 0; | |
| 77 | + cursource->line += cursource->lineinc; | |
| 78 | + if (cursource->lineinc>1) { | |
| 79 | + genline(); | |
| 80 | + } | |
| 81 | + } | |
| 82 | +} | |
| 83 | + | |
| 84 | +void | |
| 85 | +control(Tokenrow *trp) | |
| 86 | +{ | |
| 87 | + Nlist *np; | |
| 88 | + Token *tp; | |
| 89 | + | |
| 90 | + tp = trp->tp; | |
| 91 | + if (tp->type!=NAME) { | |
| 92 | + if (tp->type==NUMBER) | |
| 93 | + goto kline; | |
| 94 | + if (tp->type != NL) | |
| 95 | + error(ERROR, "Unidentifiable control line"); | |
| 96 | + return; /* else empty line */ | |
| 97 | + } | |
| 98 | + if ((np = lookup(tp, 0))==NULL || (np->flag&ISKW)==0 && !skipping) { | |
| 99 | + error(WARNING, "Unknown preprocessor control %t", tp); | |
| 100 | + return; | |
| 101 | + } | |
| 102 | + if (skipping) { | |
| 103 | + switch (np->val) { | |
| 104 | + case KENDIF: | |
| 105 | + if (--ifdepth<skipping) | |
| 106 | + skipping = 0; | |
| 107 | + --cursource->ifdepth; | |
| 108 | + setempty(trp); | |
| 109 | + return; | |
| 110 | + | |
| 111 | + case KIFDEF: | |
| 112 | + case KIFNDEF: | |
| 113 | + case KIF: | |
| 114 | + if (++ifdepth >= NIF) | |
| 115 | + error(FATAL, "#if too deeply nested"); | |
| 116 | + ++cursource->ifdepth; | |
| 117 | + return; | |
| 118 | + | |
| 119 | + case KELIF: | |
| 120 | + case KELSE: | |
| 121 | + if (ifdepth<=skipping) | |
| 122 | + break; | |
| 123 | + return; | |
| 124 | + | |
| 125 | + default: | |
| 126 | + return; | |
| 127 | + } | |
| 128 | + } | |
| 129 | + switch (np->val) { | |
| 130 | + case KDEFINE: | |
| 131 | + dodefine(trp); | |
| 132 | + break; | |
| 133 | + | |
| 134 | + case KUNDEF: | |
| 135 | + tp += 1; | |
| 136 | + if (tp->type!=NAME || trp->lp - trp->bp != 4) { | |
| 137 | + error(ERROR, "Syntax error in #undef"); | |
| 138 | + break; | |
| 139 | + } | |
| 140 | + if ((np = lookup(tp, 0))) | |
| 141 | + np->flag &= ~ISDEFINED; | |
| 142 | + break; | |
| 143 | + | |
| 144 | + case KPRAGMA: | |
| 145 | + return; | |
| 146 | + | |
| 147 | + case KIFDEF: | |
| 148 | + case KIFNDEF: | |
| 149 | + case KIF: | |
| 150 | + if (++ifdepth > NIF) | |
| 151 | + error(FATAL, "#if too deeply nested"); | |
| 152 | + ++cursource->ifdepth; | |
| 153 | + ifsatisfied[ifdepth] = 0; | |
| 154 | + if (eval(trp, np->val)) | |
| 155 | + ifsatisfied[ifdepth] = 1; | |
| 156 | + else | |
| 157 | + skipping = ifdepth; | |
| 158 | + break; | |
| 159 | + | |
| 160 | + case KELIF: | |
| 161 | + if (ifdepth==0) { | |
| 162 | + error(ERROR, "#elif with no #if"); | |
| 163 | + return; | |
| 164 | + } | |
| 165 | + if (ifsatisfied[ifdepth]==2) | |
| 166 | + error(ERROR, "#elif after #else"); | |
| 167 | + if (eval(trp, np->val)) { | |
| 168 | + if (ifsatisfied[ifdepth]) | |
| 169 | + skipping = ifdepth; | |
| 170 | + else { | |
| 171 | + skipping = 0; | |
| 172 | + ifsatisfied[ifdepth] = 1; | |
| 173 | + } | |
| 174 | + } else | |
| 175 | + skipping = ifdepth; | |
| 176 | + break; | |
| 177 | + | |
| 178 | + case KELSE: | |
| 179 | + if (ifdepth==0 || cursource->ifdepth==0) { | |
| 180 | + error(ERROR, "#else with no #if"); | |
| 181 | + return; | |
| 182 | + } | |
| 183 | + if (ifsatisfied[ifdepth]==2) | |
| 184 | + error(ERROR, "#else after #else"); | |
| 185 | + if (trp->lp - trp->bp != 3) | |
| 186 | + error(ERROR, "Syntax error in #else"); | |
| 187 | + skipping = ifsatisfied[ifdepth]? ifdepth: 0; | |
| 188 | + ifsatisfied[ifdepth] = 2; | |
| 189 | + break; | |
| 190 | + | |
| 191 | + case KENDIF: | |
| 192 | + if (ifdepth==0 || cursource->ifdepth==0) { | |
| 193 | + error(ERROR, "#endif with no #if"); | |
| 194 | + return; | |
| 195 | + } | |
| 196 | + --ifdepth; | |
| 197 | + --cursource->ifdepth; | |
| 198 | + if (trp->lp - trp->bp != 3) | |
| 199 | + error(WARNING, "Syntax error in #endif"); | |
| 200 | + break; | |
| 201 | + | |
| 202 | + case KERROR: | |
| 203 | + trp->tp = tp+1; | |
| 204 | + error(WARNING, "#error directive: %r", trp); | |
| 205 | + break; | |
| 206 | + | |
| 207 | + case KLINE: | |
| 208 | + trp->tp = tp+1; | |
| 209 | + expandrow(trp, "<line>"); | |
| 210 | + tp = trp->bp+2; | |
| 211 | + kline: | |
| 212 | + if (tp+1>=trp->lp || tp->type!=NUMBER || tp+3<trp->lp | |
| 213 | + || (tp+3==trp->lp && ((tp+1)->type!=STRING)||*(tp+1)->t=='L')){ | |
| 214 | + error(ERROR, "Syntax error in #line"); | |
| 215 | + return; | |
| 216 | + } | |
| 217 | + cursource->line = atol((char*)tp->t)-1; | |
| 218 | + if (cursource->line<0 || cursource->line>=32768) | |
| 219 | + error(WARNING, "#line specifies number out of range"); | |
| 220 | + tp = tp+1; | |
| 221 | + if (tp+1<trp->lp) | |
| 222 | + cursource->filename=(char*)newstring(tp->t+1,tp->len-2,0); | |
| 223 | + return; | |
| 224 | + | |
| 225 | + case KDEFINED: | |
| 226 | + error(ERROR, "Bad syntax for control line"); | |
| 227 | + break; | |
| 228 | + | |
| 229 | + case KINCLUDE: | |
| 230 | + doinclude(trp); | |
| 231 | + trp->lp = trp->bp; | |
| 232 | + return; | |
| 233 | + | |
| 234 | + case KEVAL: | |
| 235 | + eval(trp, np->val); | |
| 236 | + break; | |
| 237 | + | |
| 238 | + default: | |
| 239 | + error(ERROR, "Preprocessor control `%t' not yet implemented", tp); | |
| 240 | + break; | |
| 241 | + } | |
| 242 | + setempty(trp); | |
| 243 | + return; | |
| 244 | +} | |
| 245 | + | |
| 246 | +void * | |
| 247 | +domalloc(int size) | |
| 248 | +{ | |
| 249 | + void *p = malloc(size); | |
| 250 | + | |
| 251 | + if (p==NULL) | |
| 252 | + error(FATAL, "Out of memory from malloc"); | |
| 253 | + return p; | |
| 254 | +} | |
| 255 | + | |
| 256 | +void | |
| 257 | +dofree(void *p) | |
| 258 | +{ | |
| 259 | + free(p); | |
| 260 | +} | |
| 261 | + | |
| 262 | +void | |
| 263 | +error(enum errtype type, char *string, ...) | |
| 264 | +{ | |
| 265 | + va_list ap; | |
| 266 | + char *cp, *ep; | |
| 267 | + Token *tp; | |
| 268 | + Tokenrow *trp; | |
| 269 | + int i; | |
| 270 | + | |
| 271 | + if (*cursource->filename) | |
| 272 | + fprintf(stderr, "cpp: %s:%d: ", cursource->filename, cursource->line); | |
| 273 | + else | |
| 274 | + fprintf(stderr, "cpp: "); | |
| 275 | + va_start(ap, string); | |
| 276 | + for (ep=string; *ep; ep++) { | |
| 277 | + if (*ep=='%') { | |
| 278 | + switch (*++ep) { | |
| 279 | + | |
| 280 | + case 's': | |
| 281 | + cp = va_arg(ap, char *); | |
| 282 | + fprintf(stderr, "%s", cp); | |
| 283 | + break; | |
| 284 | + case 'd': | |
| 285 | + i = va_arg(ap, int); | |
| 286 | + fprintf(stderr, "%d", i); | |
| 287 | + break; | |
| 288 | + case 't': | |
| 289 | + tp = va_arg(ap, Token *); | |
| 290 | + fprintf(stderr, "%.*s", tp->len, tp->t); | |
| 291 | + break; | |
| 292 | + | |
| 293 | + case 'r': | |
| 294 | + trp = va_arg(ap, Tokenrow *); | |
| 295 | + for (tp=trp->tp; tp<trp->lp&&tp->type!=NL; tp++) { | |
| 296 | + if (tp>trp->tp && tp->wslen) | |
| 297 | + fputc(' ', stderr); | |
| 298 | + fprintf(stderr, "%.*s", tp->len, tp->t); | |
| 299 | + } | |
| 300 | + break; | |
| 301 | + | |
| 302 | + default: | |
| 303 | + fputc(*ep, stderr); | |
| 304 | + break; | |
| 305 | + } | |
| 306 | + } else | |
| 307 | + fputc(*ep, stderr); | |
| 308 | + } | |
| 309 | + va_end(ap); | |
| 310 | + fputc('\n', stderr); | |
| 311 | + if (type==FATAL) | |
| 312 | + exits("error"); | |
| 313 | + if (type!=WARNING) | |
| 314 | + nerrs = 1; | |
| 315 | + fflush(stderr); | |
| 316 | +} | |