Commit | Line | Data |
---|---|---|
3bd55f52 RH |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California | |
3 | */ | |
4 | #ifndef lint | |
55520623 | 5 | static char sccsid[] = "@(#)asscan2.c 4.14 %G%"; |
3bd55f52 RH |
6 | #endif not lint |
7 | ||
8 | #include "asscanl.h" | |
12044a7d | 9 | |
3bd55f52 | 10 | static inttoktype oval = NL; |
c86c4907 | 11 | #define ASINBUFSIZ 4096 |
12044a7d RH |
12 | char inbufunget[8]; |
13 | char inbuffer[ASINBUFSIZ]; | |
14 | char *Ginbufptr = inbuffer; | |
15 | int Ginbufcnt = 0; | |
55520623 | 16 | int scannerhadeof; |
12044a7d RH |
17 | |
18 | fillinbuffer() | |
19 | { | |
20 | int nread; | |
12044a7d RH |
21 | int goal; |
22 | int got; | |
23 | ||
24 | nread = 0; | |
55520623 | 25 | if (scannerhadeof == 0){ |
12044a7d RH |
26 | goal = sizeof(inbuffer); |
27 | do { | |
28 | got = read(stdin->_file, inbuffer + nread, goal); | |
29 | if (got == 0) | |
55520623 | 30 | scannerhadeof = 1; |
12044a7d RH |
31 | if (got <= 0) |
32 | break; | |
33 | nread += got; | |
34 | goal -= got; | |
35 | } while (goal); | |
55520623 RH |
36 | } else { |
37 | scannerhadeof = 0; | |
12044a7d | 38 | } |
3bd55f52 | 39 | /* |
12044a7d RH |
40 | * getchar assumes that Ginbufcnt and Ginbufptr |
41 | * are adjusted as if one character has been removed | |
42 | * from the input. | |
3bd55f52 | 43 | */ |
12044a7d RH |
44 | if (nread == 0){ |
45 | inbuffer[0] = EOFCHAR; | |
46 | nread = 1; | |
47 | } | |
48 | Ginbufcnt = nread - 1; | |
49 | Ginbufptr = inbuffer + 1; | |
50 | } | |
3bd55f52 | 51 | |
3bd55f52 RH |
52 | scan_dot_s(bufferbox) |
53 | struct tokbufdesc *bufferbox; | |
54 | { | |
12044a7d RH |
55 | reg char *inbufptr; |
56 | reg int inbufcnt; | |
3bd55f52 RH |
57 | reg int ryylval; /* local copy of lexical value */ |
58 | extern int yylval; /* global copy of lexical value */ | |
59 | reg int val; /* the value returned */ | |
60 | int i; /* simple counter */ | |
61 | reg char *rcp; | |
12044a7d | 62 | int ch; /* treated as a character */ |
3bd55f52 | 63 | int ch1; /* shadow value */ |
3bd55f52 | 64 | struct symtab *op; |
3bd55f52 | 65 | ptrall lgbackpatch; /* where to stuff a string length */ |
12044a7d | 66 | reg ptrall bufptr; /* where to stuff tokens */ |
3bd55f52 | 67 | ptrall bufub; /* where not to stuff tokens */ |
3bd55f52 RH |
68 | long intval; /* value of int */ |
69 | int linescrossed; /* when doing strings and comments */ | |
70 | struct Opcode opstruct; | |
ffe89e04 | 71 | reg int strlg; /* the length of a string */ |
3bd55f52 RH |
72 | |
73 | (bytetoktype *)bufptr = (bytetoktype *) & (bufferbox->toks[0]); | |
74 | (bytetoktype *)bufub = &(bufferbox->toks[AVAILTOKS]); | |
75 | ||
12044a7d | 76 | MEMTOREGBUF; |
3bd55f52 | 77 | if (newfflag){ |
ad67d5e5 | 78 | newfflag = 0; |
ffe89e04 | 79 | ryylval = (int)savestr(newfname, strlen(newfname)+1, STR_BOTH); |
ad67d5e5 | 80 | |
3bd55f52 RH |
81 | ptoken(bufptr, IFILE); |
82 | ptoken(bufptr, STRING); | |
ad67d5e5 | 83 | pptr(bufptr, ryylval); |
3bd55f52 RH |
84 | |
85 | ptoken(bufptr, ILINENO); | |
86 | ptoken(bufptr, INT); | |
87 | pint(bufptr, 1); | |
3bd55f52 RH |
88 | } |
89 | ||
90 | while (bufptr < bufub){ | |
91 | loop: | |
12044a7d | 92 | switch(ryylval = (type+1)[ch = getchar()]) { |
3bd55f52 | 93 | case SCANEOF: |
12044a7d | 94 | endoffile: ; |
3bd55f52 | 95 | inbufptr = 0; |
12044a7d RH |
96 | ptoken(bufptr, PARSEEOF); |
97 | goto done; | |
3bd55f52 RH |
98 | |
99 | case DIV: /*process C style comments*/ | |
100 | if ( (ch = getchar()) == '*') { /*comment prelude*/ | |
101 | int incomment; | |
102 | linescrossed = 0; | |
103 | incomment = 1; | |
104 | ch = getchar(); /*skip over the * */ | |
105 | while(incomment){ | |
106 | switch(ch){ | |
107 | case '*': | |
108 | ch = getchar(); | |
109 | incomment = (ch != '/'); | |
110 | break; | |
111 | case '\n': | |
112 | scanlineno++; | |
113 | linescrossed++; | |
114 | ch = getchar(); | |
115 | break; | |
116 | case EOFCHAR: | |
117 | goto endoffile; | |
3bd55f52 RH |
118 | default: |
119 | ch = getchar(); | |
120 | break; | |
121 | } | |
122 | } | |
123 | val = ILINESKIP; | |
124 | ryylval = linescrossed; | |
125 | goto ret; | |
126 | } else { /*just an ordinary DIV*/ | |
127 | ungetc(ch); | |
128 | val = ryylval = DIV; | |
129 | goto ret; | |
130 | } | |
131 | case SH: | |
132 | if (oval == NL){ | |
133 | /* | |
134 | * Attempt to recognize a C preprocessor | |
135 | * style comment '^#[ \t]*[0-9]*[ \t]*".*" | |
136 | */ | |
137 | ch = getchar(); /*bump the #*/ | |
138 | while (INCHARSET(ch, SPACE)) | |
139 | ch = getchar();/*bump white */ | |
140 | if (INCHARSET(ch, DIGIT)){ | |
141 | intval = 0; | |
142 | while(INCHARSET(ch, DIGIT)){ | |
143 | intval = intval*10 + ch - '0'; | |
144 | ch = getchar(); | |
145 | } | |
146 | while (INCHARSET(ch, SPACE)) | |
147 | ch = getchar(); | |
148 | if (ch == '"'){ | |
149 | ptoken(bufptr, ILINENO); | |
150 | ptoken(bufptr, INT); | |
151 | pint(bufptr, intval - 1); | |
152 | ptoken(bufptr, IFILE); | |
153 | /* | |
154 | * The '"' has already been | |
155 | * munched | |
156 | * | |
157 | * eatstr will not eat | |
158 | * the trailing \n, so | |
159 | * it is given to the parser | |
160 | * and counted. | |
161 | */ | |
162 | goto eatstr; | |
163 | } | |
164 | } | |
165 | } | |
166 | /* | |
167 | * Well, its just an ordinary decadent comment | |
168 | */ | |
169 | while ((ch != '\n') && (ch != EOFCHAR)) | |
170 | ch = getchar(); | |
171 | if (ch == EOFCHAR) | |
172 | goto endoffile; | |
173 | val = ryylval = oval = NL; | |
174 | scanlineno++; | |
175 | goto ret; | |
176 | ||
177 | case NL: | |
178 | scanlineno++; | |
179 | val = ryylval; | |
180 | goto ret; | |
181 | ||
182 | case SP: | |
183 | oval = SP; /*invalidate ^# meta comments*/ | |
184 | goto loop; | |
185 | ||
186 | case REGOP: /* % , could be used as modulo, or register*/ | |
187 | ch = getchar(); | |
188 | if (INCHARSET(ch, DIGIT)){ | |
189 | ryylval = ch-'0'; | |
190 | if (ch=='1') { | |
191 | if (INCHARSET( (ch = getchar()), REGDIGIT)) | |
192 | ryylval = 10+ch-'0'; | |
193 | else | |
194 | ungetc(ch); | |
195 | } | |
196 | /* | |
197 | * God only knows what the original author | |
198 | * wanted this undocumented feature to | |
199 | * do. | |
200 | * %5++ is really r7 | |
201 | */ | |
202 | while(INCHARSET( (ch = getchar()), SIGN)) { | |
203 | if (ch=='+') | |
204 | ryylval++; | |
205 | else | |
206 | ryylval--; | |
207 | } | |
208 | ungetc(ch); | |
209 | val = REG; | |
210 | } else { | |
211 | ungetc(ch); | |
212 | val = REGOP; | |
213 | } | |
214 | goto ret; | |
215 | ||
216 | case ALPH: | |
217 | ch1 = ch; | |
218 | if (INCHARSET(ch, SZSPECBEGIN)){ | |
219 | if( (ch = getchar()) == '`' || ch == '^'){ | |
220 | ch1 |= 0100; /*convert to lower*/ | |
221 | switch(ch1){ | |
222 | case 'b': ryylval = 1; break; | |
223 | case 'w': ryylval = 2; break; | |
224 | case 'l': ryylval = 4; break; | |
225 | default: ryylval = d124; break; | |
226 | } | |
227 | val = SIZESPEC; | |
228 | goto ret; | |
229 | } else { | |
230 | ungetc(ch); | |
231 | ch = ch1; /*restore first character*/ | |
232 | } | |
233 | } | |
234 | rcp = yytext; | |
235 | do { | |
abcba8d5 | 236 | if (rcp < &yytext[NCPName]) |
3bd55f52 RH |
237 | *rcp++ = ch; |
238 | } while (INCHARSET ( (ch = getchar()), ALPHA | DIGIT)); | |
239 | *rcp = '\0'; | |
240 | while (INCHARSET(ch, SPACE)) | |
241 | ch = getchar(); | |
242 | ungetc(ch); | |
243 | ||
244 | switch((op = *lookup(1))->s_tag){ | |
245 | case 0: | |
246 | case LABELID: | |
247 | /* | |
ec43bca4 | 248 | * Its a name... (Labels are subsets of name) |
3bd55f52 RH |
249 | */ |
250 | ryylval = (int)op; | |
251 | val = NAME; | |
252 | break; | |
253 | case INST0: | |
254 | case INSTn: | |
255 | case IJXXX: | |
256 | opstruct.Op_popcode = ( (struct instab *)op)->i_popcode; | |
257 | opstruct.Op_eopcode = ( (struct instab *)op)->i_eopcode; | |
258 | val = op->s_tag; | |
259 | break; | |
260 | default: | |
261 | ryylval = ( (struct instab *)op)->i_popcode; | |
262 | val = op->s_tag; | |
263 | break; | |
264 | } | |
265 | goto ret; | |
266 | ||
267 | case DIG: | |
268 | /* | |
12044a7d | 269 | * restore local inbufptr and inbufcnt |
3bd55f52 | 270 | */ |
12044a7d RH |
271 | REGTOMEMBUF; |
272 | val = number(ch); | |
273 | MEMTOREGBUF; | |
3bd55f52 RH |
274 | /* |
275 | * yylval or yybignum has been stuffed as a side | |
276 | * effect to number(); get the global yylval | |
277 | * into our fast local copy in case it was an INT. | |
278 | */ | |
279 | ryylval = yylval; | |
3bd55f52 RH |
280 | goto ret; |
281 | ||
282 | case LSH: | |
283 | case RSH: | |
284 | /* | |
285 | * We allow the C style operators | |
286 | * << and >>, as well as < and > | |
287 | */ | |
288 | if ( (ch1 = getchar()) != ch) | |
289 | ungetc(ch1); | |
290 | val = ryylval; | |
291 | goto ret; | |
292 | ||
293 | case MINUS: | |
294 | if ( (ch = getchar()) =='(') | |
295 | ryylval=val=MP; | |
296 | else { | |
297 | ungetc(ch); | |
298 | val=MINUS; | |
299 | } | |
300 | goto ret; | |
301 | ||
302 | case SQ: | |
303 | if ((ryylval = getchar()) == '\n') | |
304 | scanlineno++; /*not entirely correct*/ | |
305 | val = INT; | |
306 | goto ret; | |
307 | ||
308 | case DQ: | |
309 | eatstr: | |
310 | linescrossed = 0; | |
ffe89e04 | 311 | for (strlg = 0; /*VOID*/; strlg++){ |
ad67d5e5 RH |
312 | switch(ch = getchar()){ |
313 | case '"': | |
314 | goto tailDQ; | |
315 | default: | |
316 | stuff: | |
ec43bca4 | 317 | putc(ch, strfile); |
ad67d5e5 RH |
318 | break; |
319 | case '\n': | |
320 | yywarning("New line in a string constant"); | |
3bd55f52 RH |
321 | scanlineno++; |
322 | linescrossed++; | |
323 | ch = getchar(); | |
ad67d5e5 | 324 | switch(ch){ |
ad67d5e5 | 325 | case EOFCHAR: |
ec43bca4 | 326 | putc('\n', strfile); |
3bd55f52 | 327 | ungetc(EOFCHAR); |
ad67d5e5 RH |
328 | goto tailDQ; |
329 | default: | |
3bd55f52 RH |
330 | ungetc(ch); |
331 | ch = '\n'; | |
332 | goto stuff; | |
333 | } | |
ad67d5e5 RH |
334 | break; |
335 | ||
336 | case '\\': | |
3bd55f52 RH |
337 | ch = getchar(); /*skip the '\\'*/ |
338 | if ( INCHARSET(ch, BSESCAPE)){ | |
339 | switch (ch){ | |
340 | case 'b': ch = '\b'; goto stuff; | |
341 | case 'f': ch = '\f'; goto stuff; | |
342 | case 'n': ch = '\n'; goto stuff; | |
343 | case 'r': ch = '\r'; goto stuff; | |
344 | case 't': ch = '\t'; goto stuff; | |
345 | } | |
346 | } | |
ad67d5e5 RH |
347 | if ( !(INCHARSET(ch, OCTDIGIT)) ) |
348 | goto stuff; | |
3bd55f52 RH |
349 | i = 0; |
350 | intval = 0; | |
351 | while ( (i < 3) && (INCHARSET(ch, OCTDIGIT))){ | |
ad67d5e5 RH |
352 | i++; |
353 | intval <<= 3; | |
354 | intval += ch - '0'; | |
3bd55f52 RH |
355 | ch = getchar(); |
356 | } | |
357 | ungetc(ch); | |
8a7e35d9 | 358 | ch = (char)intval; |
3bd55f52 | 359 | goto stuff; |
ad67d5e5 | 360 | } |
3bd55f52 | 361 | } |
ad67d5e5 | 362 | tailDQ: ; |
3bd55f52 | 363 | /* |
ad67d5e5 | 364 | * account for any lines that were crossed |
3bd55f52 | 365 | */ |
3bd55f52 | 366 | if (linescrossed){ |
ad67d5e5 RH |
367 | ptoken(bufptr, ILINESKIP); |
368 | pint(bufptr, linescrossed); | |
369 | } | |
370 | /* | |
ad67d5e5 RH |
371 | * Cheat: append a trailing null to the string |
372 | * and then adjust the string length to ignore | |
373 | * the trailing null. If any STRING client requires | |
374 | * the trailing null, the client can just change STRLEN | |
375 | */ | |
ec43bca4 | 376 | putc(0, strfile); |
ffe89e04 RH |
377 | ryylval = (int)savestr((char *)0, strlg + 1, STR_FILE); |
378 | val = STRING; | |
ec43bca4 | 379 | ((struct strdesc *)ryylval)->sd_strlen -= 1; |
ad67d5e5 | 380 | goto ret; |
3bd55f52 RH |
381 | |
382 | case BADCHAR: | |
383 | linescrossed = lineno; | |
384 | lineno = scanlineno; | |
385 | yyerror("Illegal character mapped: %d, char read:(octal) %o", | |
386 | ryylval, ch); | |
387 | lineno = linescrossed; | |
388 | val = BADCHAR; | |
389 | goto ret; | |
390 | ||
391 | default: | |
392 | val = ryylval; | |
393 | goto ret; | |
394 | } /*end of the switch*/ | |
395 | /* | |
396 | * here with one token, so stuff it | |
397 | */ | |
398 | ret: | |
399 | oval = val; | |
400 | ptoken(bufptr, val); | |
401 | switch(val){ | |
402 | case ILINESKIP: | |
403 | pint(bufptr, ryylval); | |
404 | break; | |
405 | case SIZESPEC: | |
406 | pchar(bufptr, ryylval); | |
407 | break; | |
408 | case BFINT: plong(bufptr, ryylval); | |
409 | break; | |
410 | case INT: plong(bufptr, ryylval); | |
411 | break; | |
412 | case BIGNUM: pnumber(bufptr, yybignum); | |
413 | break; | |
ad67d5e5 RH |
414 | case STRING: pptr(bufptr, (int)(char *)ryylval); |
415 | break; | |
3bd55f52 RH |
416 | case NAME: pptr(bufptr, (int)(struct symtab *)ryylval); |
417 | break; | |
418 | case REG: pchar(bufptr, ryylval); | |
419 | break; | |
420 | case INST0: | |
421 | case INSTn: | |
422 | popcode(bufptr, opstruct); | |
423 | break; | |
424 | case IJXXX: | |
425 | popcode(bufptr, opstruct); | |
426 | pptr(bufptr, (int)(struct symtab *)symalloc()); | |
427 | break; | |
428 | case ISTAB: | |
429 | case ISTABSTR: | |
430 | case ISTABNONE: | |
431 | case ISTABDOT: | |
432 | case IALIGN: | |
433 | pptr(bufptr, (int)(struct symtab *)symalloc()); | |
434 | break; | |
435 | /* | |
436 | * default: | |
437 | */ | |
438 | } | |
439 | builtval: ; | |
440 | } /*end of the while to stuff the buffer*/ | |
441 | done: | |
442 | bufferbox->tok_count = (bytetoktype *)bufptr - &(bufferbox->toks[0]); | |
3bd55f52 RH |
443 | /* |
444 | * This is a real kludge: | |
445 | * | |
446 | * We put the last token in the buffer to be a MINUS | |
447 | * symbol. This last token will never be picked up | |
448 | * in the normal way, but can be looked at during | |
449 | * a peekahead look that the short circuit expression | |
450 | * evaluator uses to see if an expression is complicated. | |
451 | * | |
452 | * Consider the following situation: | |
453 | * | |
454 | * .word 45 + 47 | |
455 | * buffer 1 | buffer 0 | |
456 | * the peekahead would want to look across the buffer, | |
457 | * but will look in the buffer end zone, see the minus, and | |
458 | * fail. | |
459 | */ | |
460 | ptoken(bufptr, MINUS); | |
12044a7d | 461 | REGTOMEMBUF; |
3bd55f52 | 462 | } |