Commit | Line | Data |
---|---|---|
2a24676e DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
cccba246 | 6 | |
2a24676e | 7 | #ifndef lint |
f05dfeb5 | 8 | static char sccsid[] = "@(#)eval.c 5.4 (Berkeley) %G%"; |
2a24676e | 9 | #endif not lint |
0022c355 ML |
10 | |
11 | static char rcsid[] = "$Header: eval.c,v 1.5 84/12/26 10:39:08 linton Exp $"; | |
cccba246 ML |
12 | |
13 | /* | |
14 | * Tree evaluation. | |
15 | */ | |
16 | ||
17 | #include "defs.h" | |
18 | #include "tree.h" | |
19 | #include "operators.h" | |
0022c355 | 20 | #include "debug.h" |
cccba246 ML |
21 | #include "eval.h" |
22 | #include "events.h" | |
23 | #include "symbols.h" | |
24 | #include "scanner.h" | |
25 | #include "source.h" | |
26 | #include "object.h" | |
27 | #include "mappings.h" | |
28 | #include "process.h" | |
2fd0f574 | 29 | #include "runtime.h" |
cccba246 ML |
30 | #include "machine.h" |
31 | #include <signal.h> | |
32 | ||
33 | #ifndef public | |
34 | ||
35 | #include "machine.h" | |
36 | ||
c760d7ed | 37 | #define STACKSIZE 20000 |
cccba246 ML |
38 | |
39 | typedef Char Stack; | |
40 | ||
41 | #define push(type, value) { \ | |
42 | ((type *) (sp += sizeof(type)))[-1] = (value); \ | |
43 | } | |
44 | ||
45 | #define pop(type) ( \ | |
46 | (*((type *) (sp -= sizeof(type)))) \ | |
47 | ) | |
48 | ||
2fd0f574 SL |
49 | #define popn(n, dest) { \ |
50 | sp -= n; \ | |
51 | bcopy(sp, dest, n); \ | |
52 | } | |
53 | ||
cccba246 ML |
54 | #define alignstack() { \ |
55 | sp = (Stack *) (( ((int) sp) + sizeof(int) - 1)&~(sizeof(int) - 1)); \ | |
56 | } | |
57 | ||
58 | #endif | |
59 | ||
60 | public Stack stack[STACKSIZE]; | |
61 | public Stack *sp = &stack[0]; | |
b5c2913a | 62 | public Boolean useInstLoc = false; |
cccba246 ML |
63 | |
64 | #define chksp() \ | |
65 | { \ | |
66 | if (sp < &stack[0]) { \ | |
67 | panic("stack underflow"); \ | |
68 | } \ | |
69 | } | |
70 | ||
71 | #define poparg(n, r, fr) { \ | |
72 | eval(p->value.arg[n]); \ | |
73 | if (isreal(p->op)) { \ | |
2fd0f574 SL |
74 | if (size(p->value.arg[n]->nodetype) == sizeof(float)) { \ |
75 | fr = pop(float); \ | |
76 | } else { \ | |
77 | fr = pop(double); \ | |
78 | } \ | |
cccba246 ML |
79 | } else if (isint(p->op)) { \ |
80 | r = popsmall(p->value.arg[n]->nodetype); \ | |
81 | } \ | |
82 | } | |
83 | ||
84 | #define Boolrep char /* underlying representation type for booleans */ | |
85 | ||
0022c355 ML |
86 | /* |
87 | * Command-level evaluation. | |
88 | */ | |
89 | ||
90 | public Node topnode; | |
91 | ||
92 | public topeval (p) | |
93 | Node p; | |
94 | { | |
95 | if (traceeval) { | |
96 | fprintf(stderr, "topeval("); | |
97 | prtree(stderr, p); | |
98 | fprintf(stderr, ")\n"); | |
99 | fflush(stderr); | |
100 | } | |
101 | topnode = p; | |
102 | eval(p); | |
103 | } | |
104 | ||
cccba246 ML |
105 | /* |
106 | * Evaluate a parse tree leaving the value on the top of the stack. | |
107 | */ | |
108 | ||
109 | public eval(p) | |
110 | register Node p; | |
111 | { | |
112 | long r0, r1; | |
113 | double fr0, fr1; | |
114 | Address addr; | |
115 | long i, n; | |
116 | int len; | |
0022c355 | 117 | Symbol s; |
cccba246 | 118 | Node n1, n2; |
0022c355 | 119 | boolean b; |
cccba246 | 120 | File file; |
0022c355 | 121 | String str; |
cccba246 ML |
122 | |
123 | checkref(p); | |
0022c355 ML |
124 | if (traceeval) { |
125 | fprintf(stderr, "begin eval %s\n", opname(p->op)); | |
c760d7ed | 126 | } |
cccba246 ML |
127 | switch (degree(p->op)) { |
128 | case BINARY: | |
129 | poparg(1, r1, fr1); | |
130 | poparg(0, r0, fr0); | |
131 | break; | |
132 | ||
133 | case UNARY: | |
134 | poparg(0, r0, fr0); | |
135 | break; | |
136 | ||
137 | default: | |
138 | /* do nothing */; | |
139 | } | |
140 | switch (p->op) { | |
141 | case O_SYM: | |
142 | s = p->value.sym; | |
143 | if (s == retaddrsym) { | |
144 | push(long, return_addr()); | |
0022c355 ML |
145 | } else if (isvariable(s)) { |
146 | if (s != program and not isactive(container(s))) { | |
147 | error("\"%s\" is not active", symname(s)); | |
148 | } | |
149 | if (isvarparam(s) and not isopenarray(s)) { | |
150 | rpush(address(s, nil), sizeof(Address)); | |
cccba246 | 151 | } else { |
0022c355 | 152 | push(Address, address(s, nil)); |
cccba246 | 153 | } |
0022c355 ML |
154 | } else if (isblock(s)) { |
155 | push(Symbol, s); | |
156 | } else if (isconst(s)) { | |
157 | eval(constval(s)); | |
158 | } else { | |
159 | error("can't evaluate a %s", classname(s)); | |
cccba246 ML |
160 | } |
161 | break; | |
162 | ||
163 | case O_LCON: | |
0022c355 | 164 | case O_CCON: |
cccba246 ML |
165 | r0 = p->value.lcon; |
166 | pushsmall(p->nodetype, r0); | |
167 | break; | |
168 | ||
169 | case O_FCON: | |
170 | push(double, p->value.fcon); | |
171 | break; | |
172 | ||
173 | case O_SCON: | |
174 | len = size(p->nodetype); | |
175 | mov(p->value.scon, sp, len); | |
176 | sp += len; | |
177 | break; | |
178 | ||
179 | case O_INDEX: | |
0022c355 ML |
180 | s = p->value.arg[0]->nodetype; |
181 | p->value.arg[0]->nodetype = t_addr; | |
182 | eval(p->value.arg[0]); | |
183 | p->value.arg[0]->nodetype = s; | |
184 | n = pop(Address); | |
185 | eval(p->value.arg[1]); | |
186 | evalindex(s, n, popsmall(p->value.arg[1]->nodetype)); | |
cccba246 ML |
187 | break; |
188 | ||
189 | case O_DOT: | |
190 | s = p->value.arg[1]->value.sym; | |
0022c355 ML |
191 | eval(p->value.arg[0]); |
192 | n = pop(long); | |
cccba246 ML |
193 | push(long, n + (s->symvalue.field.offset div 8)); |
194 | break; | |
195 | ||
196 | /* | |
197 | * Get the value of the expression addressed by the top of the stack. | |
198 | * Push the result back on the stack. | |
199 | */ | |
200 | ||
201 | case O_INDIR: | |
202 | case O_RVAL: | |
203 | addr = pop(long); | |
204 | if (addr == 0) { | |
205 | error("reference through nil pointer"); | |
206 | } | |
0022c355 | 207 | len = size(p->nodetype); |
cccba246 ML |
208 | rpush(addr, len); |
209 | break; | |
210 | ||
80ba8b01 | 211 | /* |
0022c355 ML |
212 | * Move the stack pointer so that the top of the stack has |
213 | * something corresponding to the size of the current node type. | |
214 | * If this new type is bigger than the subtree (len > 0), | |
215 | * then the stack is padded with nulls. If it's smaller, | |
216 | * the stack is just dropped by the appropriate amount. | |
80ba8b01 ML |
217 | */ |
218 | case O_TYPERENAME: | |
3be1b78f | 219 | typerename(size(p->value.arg[0]->nodetype), size(p->nodetype)); |
80ba8b01 ML |
220 | break; |
221 | ||
cccba246 | 222 | case O_COMMA: |
0022c355 ML |
223 | eval(p->value.arg[0]); |
224 | if (p->value.arg[1] != nil) { | |
225 | eval(p->value.arg[1]); | |
226 | } | |
cccba246 ML |
227 | break; |
228 | ||
229 | case O_ITOF: | |
230 | push(double, (double) r0); | |
231 | break; | |
232 | ||
233 | case O_ADD: | |
234 | push(long, r0+r1); | |
235 | break; | |
236 | ||
237 | case O_ADDF: | |
238 | push(double, fr0+fr1); | |
239 | break; | |
240 | ||
241 | case O_SUB: | |
242 | push(long, r0-r1); | |
243 | break; | |
244 | ||
245 | case O_SUBF: | |
246 | push(double, fr0-fr1); | |
247 | break; | |
248 | ||
249 | case O_NEG: | |
250 | push(long, -r0); | |
251 | break; | |
252 | ||
253 | case O_NEGF: | |
254 | push(double, -fr0); | |
255 | break; | |
256 | ||
257 | case O_MUL: | |
258 | push(long, r0*r1); | |
259 | break; | |
260 | ||
261 | case O_MULF: | |
262 | push(double, fr0*fr1); | |
263 | break; | |
264 | ||
265 | case O_DIVF: | |
266 | if (fr1 == 0) { | |
267 | error("error: division by 0"); | |
268 | } | |
269 | push(double, fr0 / fr1); | |
270 | break; | |
271 | ||
272 | case O_DIV: | |
273 | if (r1 == 0) { | |
274 | error("error: div by 0"); | |
275 | } | |
276 | push(long, r0 div r1); | |
277 | break; | |
278 | ||
279 | case O_MOD: | |
280 | if (r1 == 0) { | |
281 | error("error: mod by 0"); | |
282 | } | |
283 | push(long, r0 mod r1); | |
284 | break; | |
285 | ||
286 | case O_LT: | |
287 | push(Boolrep, r0 < r1); | |
288 | break; | |
289 | ||
290 | case O_LTF: | |
291 | push(Boolrep, fr0 < fr1); | |
292 | break; | |
293 | ||
294 | case O_LE: | |
295 | push(Boolrep, r0 <= r1); | |
296 | break; | |
297 | ||
298 | case O_LEF: | |
299 | push(Boolrep, fr0 <= fr1); | |
300 | break; | |
301 | ||
302 | case O_GT: | |
303 | push(Boolrep, r0 > r1); | |
304 | break; | |
305 | ||
306 | case O_GTF: | |
307 | push(Boolrep, fr0 > fr1); | |
308 | break; | |
309 | ||
310 | case O_EQ: | |
311 | push(Boolrep, r0 == r1); | |
312 | break; | |
313 | ||
314 | case O_EQF: | |
315 | push(Boolrep, fr0 == fr1); | |
316 | break; | |
317 | ||
318 | case O_NE: | |
319 | push(Boolrep, r0 != r1); | |
320 | break; | |
321 | ||
322 | case O_NEF: | |
323 | push(Boolrep, fr0 != fr1); | |
324 | break; | |
325 | ||
326 | case O_AND: | |
327 | push(Boolrep, r0 and r1); | |
328 | break; | |
329 | ||
330 | case O_OR: | |
331 | push(Boolrep, r0 or r1); | |
332 | break; | |
333 | ||
334 | case O_ASSIGN: | |
335 | assign(p->value.arg[0], p->value.arg[1]); | |
336 | break; | |
337 | ||
338 | case O_CHFILE: | |
339 | if (p->value.scon == nil) { | |
340 | printf("%s\n", cursource); | |
341 | } else { | |
342 | file = opensource(p->value.scon); | |
343 | if (file == nil) { | |
344 | error("can't read \"%s\"", p->value.scon); | |
345 | } else { | |
346 | fclose(file); | |
347 | setsource(p->value.scon); | |
348 | } | |
349 | } | |
350 | break; | |
351 | ||
352 | case O_CONT: | |
fd49257b | 353 | cont(p->value.lcon); |
cccba246 ML |
354 | printnews(); |
355 | break; | |
356 | ||
357 | case O_LIST: | |
0022c355 | 358 | list(p); |
cccba246 ML |
359 | break; |
360 | ||
361 | case O_FUNC: | |
0022c355 | 362 | func(p->value.arg[0]); |
cccba246 ML |
363 | break; |
364 | ||
365 | case O_EXAMINE: | |
366 | eval(p->value.examine.beginaddr); | |
367 | r0 = pop(long); | |
368 | if (p->value.examine.endaddr == nil) { | |
369 | n = p->value.examine.count; | |
80ba8b01 ML |
370 | if (n == 0) { |
371 | printvalue(r0, p->value.examine.mode); | |
372 | } else if (streq(p->value.examine.mode, "i")) { | |
cccba246 ML |
373 | printninst(n, (Address) r0); |
374 | } else { | |
375 | printndata(n, (Address) r0, p->value.examine.mode); | |
376 | } | |
377 | } else { | |
378 | eval(p->value.examine.endaddr); | |
379 | r1 = pop(long); | |
380 | if (streq(p->value.examine.mode, "i")) { | |
381 | printinst((Address)r0, (Address)r1); | |
382 | } else { | |
383 | printdata((Address)r0, (Address)r1, p->value.examine.mode); | |
384 | } | |
385 | } | |
386 | break; | |
387 | ||
388 | case O_PRINT: | |
389 | for (n1 = p->value.arg[0]; n1 != nil; n1 = n1->value.arg[1]) { | |
390 | eval(n1->value.arg[0]); | |
391 | printval(n1->value.arg[0]->nodetype); | |
392 | putchar(' '); | |
393 | } | |
394 | putchar('\n'); | |
395 | break; | |
396 | ||
397 | case O_PSYM: | |
398 | if (p->value.arg[0]->op == O_SYM) { | |
399 | psym(p->value.arg[0]->value.sym); | |
400 | } else { | |
401 | psym(p->value.arg[0]->nodetype); | |
402 | } | |
403 | break; | |
404 | ||
405 | case O_QLINE: | |
406 | eval(p->value.arg[1]); | |
407 | break; | |
408 | ||
409 | case O_STEP: | |
410 | b = inst_tracing; | |
411 | inst_tracing = (Boolean) (not p->value.step.source); | |
412 | if (p->value.step.skipcalls) { | |
413 | next(); | |
414 | } else { | |
415 | stepc(); | |
416 | } | |
417 | inst_tracing = b; | |
b5c2913a | 418 | useInstLoc = (Boolean) (not p->value.step.source); |
cccba246 ML |
419 | printnews(); |
420 | break; | |
421 | ||
422 | case O_WHATIS: | |
423 | if (p->value.arg[0]->op == O_SYM) { | |
424 | printdecl(p->value.arg[0]->value.sym); | |
425 | } else { | |
426 | printdecl(p->value.arg[0]->nodetype); | |
427 | } | |
428 | break; | |
429 | ||
430 | case O_WHERE: | |
431 | wherecmd(); | |
432 | break; | |
433 | ||
434 | case O_WHEREIS: | |
c760d7ed | 435 | if (p->value.arg[0]->op == O_SYM) { |
0022c355 | 436 | printwhereis(stdout, p->value.arg[0]->value.sym); |
c760d7ed | 437 | } else { |
0022c355 | 438 | printwhereis(stdout, p->value.arg[0]->nodetype); |
c760d7ed | 439 | } |
cccba246 ML |
440 | break; |
441 | ||
442 | case O_WHICH: | |
c760d7ed | 443 | if (p->value.arg[0]->op == O_SYM) { |
0022c355 | 444 | printwhich(stdout, p->value.arg[0]->value.sym); |
c760d7ed | 445 | } else { |
0022c355 | 446 | printwhich(stdout, p->value.arg[0]->nodetype); |
c760d7ed | 447 | } |
cccba246 ML |
448 | putchar('\n'); |
449 | break; | |
450 | ||
451 | case O_ALIAS: | |
452 | n1 = p->value.arg[0]; | |
453 | n2 = p->value.arg[1]; | |
0022c355 ML |
454 | if (n2 == nil) { |
455 | if (n1 == nil) { | |
456 | alias(nil, nil, nil); | |
457 | } else { | |
458 | alias(n1->value.name, nil, nil); | |
459 | } | |
460 | } else if (n2->op == O_NAME) { | |
461 | str = ident(n2->value.name); | |
462 | alias(n1->value.name, nil, strdup(str)); | |
cccba246 | 463 | } else { |
0022c355 ML |
464 | if (n1->op == O_COMMA) { |
465 | alias( | |
466 | n1->value.arg[0]->value.name, | |
467 | (List) n1->value.arg[1], | |
468 | n2->value.scon | |
469 | ); | |
470 | } else { | |
471 | alias(n1->value.name, nil, n2->value.scon); | |
472 | } | |
cccba246 ML |
473 | } |
474 | break; | |
475 | ||
0022c355 ML |
476 | case O_UNALIAS: |
477 | unalias(p->value.arg[0]->value.name); | |
478 | break; | |
479 | ||
480 | case O_CALLPROC: | |
481 | callproc(p, false); | |
482 | break; | |
483 | ||
cccba246 | 484 | case O_CALL: |
0022c355 | 485 | callproc(p, true); |
cccba246 ML |
486 | break; |
487 | ||
488 | case O_CATCH: | |
0022c355 ML |
489 | if (p->value.lcon == 0) { |
490 | printsigscaught(process); | |
491 | } else { | |
492 | psigtrace(process, p->value.lcon, true); | |
493 | } | |
cccba246 ML |
494 | break; |
495 | ||
496 | case O_EDIT: | |
497 | edit(p->value.scon); | |
498 | break; | |
499 | ||
c760d7ed AF |
500 | case O_DEBUG: |
501 | debug(p); | |
502 | break; | |
503 | ||
2fd0f574 SL |
504 | case O_DOWN: |
505 | checkref(p->value.arg[0]); | |
506 | assert(p->value.arg[0]->op == O_LCON); | |
507 | down(p->value.arg[0]->value.lcon); | |
508 | break; | |
509 | ||
cccba246 | 510 | case O_DUMP: |
0022c355 ML |
511 | if (p->value.arg[0] == nil) { |
512 | dumpall(); | |
513 | } else { | |
514 | s = p->value.arg[0]->value.sym; | |
515 | if (s == curfunc) { | |
516 | dump(nil); | |
517 | } else { | |
518 | dump(s); | |
519 | } | |
520 | } | |
cccba246 ML |
521 | break; |
522 | ||
523 | case O_GRIPE: | |
524 | gripe(); | |
525 | break; | |
526 | ||
527 | case O_HELP: | |
528 | help(); | |
529 | break; | |
530 | ||
531 | case O_IGNORE: | |
0022c355 ML |
532 | if (p->value.lcon == 0) { |
533 | printsigsignored(process); | |
534 | } else { | |
535 | psigtrace(process, p->value.lcon, false); | |
536 | } | |
cccba246 ML |
537 | break; |
538 | ||
2fd0f574 SL |
539 | case O_RETURN: |
540 | if (p->value.arg[0] == nil) { | |
541 | rtnfunc(nil); | |
542 | } else { | |
543 | assert(p->value.arg[0]->op == O_SYM); | |
544 | rtnfunc(p->value.arg[0]->value.sym); | |
545 | } | |
546 | break; | |
547 | ||
cccba246 ML |
548 | case O_RUN: |
549 | run(); | |
550 | break; | |
551 | ||
0022c355 ML |
552 | case O_SET: |
553 | set(p->value.arg[0], p->value.arg[1]); | |
554 | break; | |
555 | ||
556 | case O_SEARCH: | |
557 | search(p->value.arg[0]->value.lcon, p->value.arg[1]->value.scon); | |
558 | break; | |
559 | ||
cccba246 ML |
560 | case O_SOURCE: |
561 | setinput(p->value.scon); | |
562 | break; | |
563 | ||
564 | case O_STATUS: | |
565 | status(); | |
566 | break; | |
567 | ||
568 | case O_TRACE: | |
569 | case O_TRACEI: | |
570 | trace(p); | |
cccba246 ML |
571 | break; |
572 | ||
573 | case O_STOP: | |
574 | case O_STOPI: | |
575 | stop(p); | |
cccba246 ML |
576 | break; |
577 | ||
0022c355 ML |
578 | case O_UNSET: |
579 | undefvar(p->value.arg[0]->value.name); | |
580 | break; | |
581 | ||
2fd0f574 SL |
582 | case O_UP: |
583 | checkref(p->value.arg[0]); | |
584 | assert(p->value.arg[0]->op == O_LCON); | |
585 | up(p->value.arg[0]->value.lcon); | |
586 | break; | |
587 | ||
cccba246 ML |
588 | case O_ADDEVENT: |
589 | addevent(p->value.event.cond, p->value.event.actions); | |
590 | break; | |
591 | ||
592 | case O_DELETE: | |
2fd0f574 SL |
593 | n1 = p->value.arg[0]; |
594 | while (n1->op == O_COMMA) { | |
595 | n2 = n1->value.arg[0]; | |
596 | assert(n2->op == O_LCON); | |
597 | if (not delevent((unsigned int) n2->value.lcon)) { | |
598 | error("unknown event %ld", n2->value.lcon); | |
599 | } | |
600 | n1 = n1->value.arg[1]; | |
601 | } | |
602 | assert(n1->op == O_LCON); | |
603 | if (not delevent((unsigned int) n1->value.lcon)) { | |
604 | error("unknown event %ld", n1->value.lcon); | |
605 | } | |
cccba246 ML |
606 | break; |
607 | ||
608 | case O_ENDX: | |
609 | endprogram(); | |
610 | break; | |
611 | ||
612 | case O_IF: | |
613 | if (cond(p->value.event.cond)) { | |
614 | evalcmdlist(p->value.event.actions); | |
615 | } | |
616 | break; | |
617 | ||
618 | case O_ONCE: | |
619 | event_once(p->value.event.cond, p->value.event.actions); | |
620 | break; | |
621 | ||
622 | case O_PRINTCALL: | |
623 | printcall(p->value.sym, whatblock(return_addr())); | |
624 | break; | |
625 | ||
626 | case O_PRINTIFCHANGED: | |
627 | printifchanged(p->value.arg[0]); | |
628 | break; | |
629 | ||
630 | case O_PRINTRTN: | |
631 | printrtn(p->value.sym); | |
632 | break; | |
633 | ||
634 | case O_PRINTSRCPOS: | |
635 | getsrcpos(); | |
636 | if (p->value.arg[0] == nil) { | |
637 | printsrcpos(); | |
638 | putchar('\n'); | |
639 | printlines(curline, curline); | |
640 | } else if (p->value.arg[0]->op == O_QLINE) { | |
641 | if (p->value.arg[0]->value.arg[1]->value.lcon == 0) { | |
642 | printf("tracei: "); | |
643 | printinst(pc, pc); | |
644 | } else { | |
0022c355 ML |
645 | if (canReadSource()) { |
646 | printf("trace: "); | |
647 | printlines(curline, curline); | |
648 | } | |
cccba246 ML |
649 | } |
650 | } else { | |
651 | printsrcpos(); | |
652 | printf(": "); | |
653 | eval(p->value.arg[0]); | |
654 | prtree(stdout, p->value.arg[0]); | |
655 | printf(" = "); | |
656 | printval(p->value.arg[0]->nodetype); | |
657 | putchar('\n'); | |
658 | } | |
659 | break; | |
660 | ||
661 | case O_PROCRTN: | |
662 | procreturn(p->value.sym); | |
663 | break; | |
664 | ||
665 | case O_STOPIFCHANGED: | |
666 | stopifchanged(p->value.arg[0]); | |
667 | break; | |
668 | ||
669 | case O_STOPX: | |
670 | isstopped = true; | |
671 | break; | |
672 | ||
673 | case O_TRACEON: | |
674 | traceon(p->value.trace.inst, p->value.trace.event, | |
675 | p->value.trace.actions); | |
676 | break; | |
677 | ||
678 | case O_TRACEOFF: | |
679 | traceoff(p->value.lcon); | |
680 | break; | |
681 | ||
682 | default: | |
683 | panic("eval: bad op %d", p->op); | |
684 | } | |
0022c355 ML |
685 | if (traceeval) { |
686 | fprintf(stderr, "end eval %s\n", opname(p->op)); | |
687 | } | |
cccba246 ML |
688 | } |
689 | ||
690 | /* | |
691 | * Evaluate a list of commands. | |
692 | */ | |
693 | ||
694 | public evalcmdlist(cl) | |
695 | Cmdlist cl; | |
696 | { | |
697 | Command c; | |
698 | ||
699 | foreach (Command, c, cl) | |
700 | evalcmd(c); | |
701 | endfor | |
702 | } | |
703 | ||
704 | /* | |
705 | * Push "len" bytes onto the expression stack from address "addr" | |
706 | * in the process. If there isn't room on the stack, print an error message. | |
707 | */ | |
708 | ||
709 | public rpush(addr, len) | |
710 | Address addr; | |
711 | int len; | |
712 | { | |
713 | if (not canpush(len)) { | |
714 | error("expression too large to evaluate"); | |
715 | } else { | |
716 | chksp(); | |
717 | dread(sp, addr, len); | |
718 | sp += len; | |
719 | } | |
720 | } | |
721 | ||
722 | /* | |
723 | * Check if the stack has n bytes available. | |
724 | */ | |
725 | ||
726 | public Boolean canpush(n) | |
727 | Integer n; | |
728 | { | |
729 | return (Boolean) (sp + n < &stack[STACKSIZE]); | |
730 | } | |
731 | ||
732 | /* | |
733 | * Push a small scalar of the given type onto the stack. | |
734 | */ | |
735 | ||
736 | public pushsmall(t, v) | |
737 | Symbol t; | |
738 | long v; | |
739 | { | |
740 | register Integer s; | |
741 | ||
742 | s = size(t); | |
743 | switch (s) { | |
744 | case sizeof(char): | |
745 | push(char, v); | |
746 | break; | |
747 | ||
748 | case sizeof(short): | |
749 | push(short, v); | |
750 | break; | |
751 | ||
752 | case sizeof(long): | |
753 | push(long, v); | |
754 | break; | |
755 | ||
756 | default: | |
757 | panic("bad size %d in popsmall", s); | |
758 | } | |
759 | } | |
760 | ||
761 | /* | |
762 | * Pop an item of the given type which is assumed to be no larger | |
763 | * than a long and return it expanded into a long. | |
764 | */ | |
765 | ||
766 | public long popsmall(t) | |
767 | Symbol t; | |
768 | { | |
0022c355 | 769 | register integer n; |
cccba246 ML |
770 | long r; |
771 | ||
0022c355 ML |
772 | n = size(t); |
773 | if (n == sizeof(char)) { | |
774 | if (t->class == RANGE and t->symvalue.rangev.lower >= 0) { | |
775 | r = (long) pop(unsigned char); | |
776 | } else { | |
cccba246 | 777 | r = (long) pop(char); |
0022c355 ML |
778 | } |
779 | } else if (n == sizeof(short)) { | |
780 | if (t->class == RANGE and t->symvalue.rangev.lower >= 0) { | |
781 | r = (long) pop(unsigned short); | |
782 | } else { | |
cccba246 | 783 | r = (long) pop(short); |
0022c355 ML |
784 | } |
785 | } else if (n == sizeof(long)) { | |
786 | r = pop(long); | |
787 | } else { | |
788 | error("[internal error: size %d in popsmall]", n); | |
cccba246 ML |
789 | } |
790 | return r; | |
791 | } | |
792 | ||
793 | /* | |
794 | * Evaluate a conditional expression. | |
795 | */ | |
796 | ||
797 | public Boolean cond(p) | |
798 | Node p; | |
799 | { | |
800 | register Boolean b; | |
801 | ||
802 | if (p == nil) { | |
803 | b = true; | |
804 | } else { | |
805 | eval(p); | |
40ea9b88 | 806 | b = (Boolean) pop(Boolrep); |
cccba246 ML |
807 | } |
808 | return b; | |
809 | } | |
810 | ||
811 | /* | |
812 | * Return the address corresponding to a given tree. | |
813 | */ | |
814 | ||
815 | public Address lval(p) | |
816 | Node p; | |
817 | { | |
818 | if (p->op == O_RVAL) { | |
819 | eval(p->value.arg[0]); | |
820 | } else { | |
821 | eval(p); | |
822 | } | |
823 | return (Address) (pop(long)); | |
824 | } | |
825 | ||
826 | /* | |
827 | * Process a trace command, translating into the appropriate events | |
828 | * and associated actions. | |
829 | */ | |
830 | ||
831 | public trace(p) | |
832 | Node p; | |
833 | { | |
834 | Node exp, place, cond; | |
835 | Node left; | |
836 | ||
837 | exp = p->value.arg[0]; | |
838 | place = p->value.arg[1]; | |
839 | cond = p->value.arg[2]; | |
840 | if (exp == nil) { | |
841 | traceall(p->op, place, cond); | |
ab538816 | 842 | } else if (exp->op == O_QLINE or exp->op == O_LCON) { |
cccba246 ML |
843 | traceinst(p->op, exp, cond); |
844 | } else if (place != nil and place->op == O_QLINE) { | |
845 | traceat(p->op, exp, place, cond); | |
846 | } else { | |
7bf092d9 ML |
847 | left = exp; |
848 | if (left->op == O_RVAL or left->op == O_CALL) { | |
849 | left = left->value.arg[0]; | |
850 | } | |
cccba246 ML |
851 | if (left->op == O_SYM and isblock(left->value.sym)) { |
852 | traceproc(p->op, left->value.sym, place, cond); | |
853 | } else { | |
854 | tracedata(p->op, exp, place, cond); | |
855 | } | |
856 | } | |
857 | } | |
858 | ||
859 | /* | |
860 | * Set a breakpoint that will turn on tracing. | |
861 | */ | |
862 | ||
863 | private traceall(op, place, cond) | |
864 | Operator op; | |
865 | Node place; | |
866 | Node cond; | |
867 | { | |
868 | Symbol s; | |
869 | Node event; | |
870 | Command action; | |
871 | ||
872 | if (place == nil) { | |
873 | s = program; | |
874 | } else { | |
875 | s = place->value.sym; | |
876 | } | |
877 | event = build(O_EQ, build(O_SYM, procsym), build(O_SYM, s)); | |
878 | action = build(O_PRINTSRCPOS, | |
879 | build(O_QLINE, nil, build(O_LCON, (op == O_TRACE) ? 1 : 0))); | |
880 | if (cond != nil) { | |
881 | action = build(O_IF, cond, buildcmdlist(action)); | |
882 | } | |
883 | action = build(O_TRACEON, (op == O_TRACEI), buildcmdlist(action)); | |
884 | action->value.trace.event = addevent(event, buildcmdlist(action)); | |
fd49257b ML |
885 | if (isstdin()) { |
886 | printevent(action->value.trace.event); | |
887 | } | |
cccba246 ML |
888 | } |
889 | ||
890 | /* | |
891 | * Set up the appropriate breakpoint for tracing an instruction. | |
892 | */ | |
893 | ||
894 | private traceinst(op, exp, cond) | |
895 | Operator op; | |
896 | Node exp; | |
897 | Node cond; | |
898 | { | |
ab538816 | 899 | Node event, wh; |
cccba246 | 900 | Command action; |
fd49257b | 901 | Event e; |
cccba246 | 902 | |
ab538816 | 903 | if (exp->op == O_LCON) { |
0022c355 | 904 | wh = build(O_QLINE, build(O_SCON, strdup(cursource)), exp); |
ab538816 ML |
905 | } else { |
906 | wh = exp; | |
907 | } | |
cccba246 | 908 | if (op == O_TRACEI) { |
ab538816 | 909 | event = build(O_EQ, build(O_SYM, pcsym), wh); |
cccba246 | 910 | } else { |
ab538816 | 911 | event = build(O_EQ, build(O_SYM, linesym), wh); |
cccba246 | 912 | } |
ab538816 | 913 | action = build(O_PRINTSRCPOS, wh); |
cccba246 ML |
914 | if (cond) { |
915 | action = build(O_IF, cond, buildcmdlist(action)); | |
916 | } | |
fd49257b ML |
917 | e = addevent(event, buildcmdlist(action)); |
918 | if (isstdin()) { | |
919 | printevent(e); | |
920 | } | |
cccba246 ML |
921 | } |
922 | ||
923 | /* | |
924 | * Set a breakpoint to print an expression at a given line or address. | |
925 | */ | |
926 | ||
927 | private traceat(op, exp, place, cond) | |
928 | Operator op; | |
929 | Node exp; | |
930 | Node place; | |
931 | Node cond; | |
932 | { | |
933 | Node event; | |
934 | Command action; | |
fd49257b | 935 | Event e; |
cccba246 ML |
936 | |
937 | if (op == O_TRACEI) { | |
938 | event = build(O_EQ, build(O_SYM, pcsym), place); | |
939 | } else { | |
940 | event = build(O_EQ, build(O_SYM, linesym), place); | |
941 | } | |
942 | action = build(O_PRINTSRCPOS, exp); | |
943 | if (cond != nil) { | |
944 | action = build(O_IF, cond, buildcmdlist(action)); | |
945 | } | |
fd49257b ML |
946 | e = addevent(event, buildcmdlist(action)); |
947 | if (isstdin()) { | |
948 | printevent(e); | |
949 | } | |
cccba246 ML |
950 | } |
951 | ||
952 | /* | |
953 | * Construct event for tracing a procedure. | |
954 | * | |
955 | * What we want here is | |
956 | * | |
957 | * when $proc = p do | |
958 | * if <condition> then | |
959 | * printcall; | |
960 | * once $pc = $retaddr do | |
961 | * printrtn; | |
962 | * end; | |
963 | * end if; | |
964 | * end; | |
965 | * | |
966 | * Note that "once" is like "when" except that the event | |
967 | * deletes itself as part of its associated action. | |
968 | */ | |
969 | ||
970 | private traceproc(op, p, place, cond) | |
971 | Operator op; | |
972 | Symbol p; | |
973 | Node place; | |
974 | Node cond; | |
975 | { | |
976 | Node event; | |
977 | Command action; | |
978 | Cmdlist actionlist; | |
fd49257b | 979 | Event e; |
cccba246 ML |
980 | |
981 | action = build(O_PRINTCALL, p); | |
982 | actionlist = list_alloc(); | |
983 | cmdlist_append(action, actionlist); | |
984 | event = build(O_EQ, build(O_SYM, pcsym), build(O_SYM, retaddrsym)); | |
985 | action = build(O_ONCE, event, buildcmdlist(build(O_PRINTRTN, p))); | |
986 | cmdlist_append(action, actionlist); | |
987 | if (cond != nil) { | |
988 | actionlist = buildcmdlist(build(O_IF, cond, actionlist)); | |
989 | } | |
990 | event = build(O_EQ, build(O_SYM, procsym), build(O_SYM, p)); | |
fd49257b ML |
991 | e = addevent(event, actionlist); |
992 | if (isstdin()) { | |
993 | printevent(e); | |
994 | } | |
cccba246 ML |
995 | } |
996 | ||
997 | /* | |
998 | * Set up breakpoint for tracing data. | |
999 | */ | |
1000 | ||
1001 | private tracedata(op, exp, place, cond) | |
1002 | Operator op; | |
1003 | Node exp; | |
1004 | Node place; | |
1005 | Node cond; | |
1006 | { | |
1007 | Symbol p; | |
1008 | Node event; | |
1009 | Command action; | |
1010 | ||
1011 | p = (place == nil) ? tcontainer(exp) : place->value.sym; | |
1012 | if (p == nil) { | |
1013 | p = program; | |
1014 | } | |
1015 | action = build(O_PRINTIFCHANGED, exp); | |
1016 | if (cond != nil) { | |
1017 | action = build(O_IF, cond, buildcmdlist(action)); | |
1018 | } | |
1019 | action = build(O_TRACEON, (op == O_TRACEI), buildcmdlist(action)); | |
1020 | event = build(O_EQ, build(O_SYM, procsym), build(O_SYM, p)); | |
1021 | action->value.trace.event = addevent(event, buildcmdlist(action)); | |
fd49257b ML |
1022 | if (isstdin()) { |
1023 | printevent(action->value.trace.event); | |
1024 | } | |
cccba246 ML |
1025 | } |
1026 | ||
1027 | /* | |
1028 | * Setting and unsetting of stops. | |
1029 | */ | |
1030 | ||
1031 | public stop(p) | |
1032 | Node p; | |
1033 | { | |
40ea9b88 | 1034 | Node exp, place, cond, t; |
cccba246 ML |
1035 | Symbol s; |
1036 | Command action; | |
fd49257b | 1037 | Event e; |
cccba246 ML |
1038 | |
1039 | exp = p->value.arg[0]; | |
1040 | place = p->value.arg[1]; | |
1041 | cond = p->value.arg[2]; | |
1042 | if (exp != nil) { | |
1043 | stopvar(p->op, exp, place, cond); | |
cccba246 | 1044 | } else { |
40ea9b88 ML |
1045 | action = build(O_STOPX); |
1046 | if (cond != nil) { | |
1047 | action = build(O_IF, cond, buildcmdlist(action)); | |
1048 | } | |
2fd0f574 SL |
1049 | if (place == nil or place->op == O_SYM) { |
1050 | if (place == nil) { | |
1051 | s = program; | |
1052 | } else { | |
1053 | s = place->value.sym; | |
1054 | } | |
40ea9b88 ML |
1055 | t = build(O_EQ, build(O_SYM, procsym), build(O_SYM, s)); |
1056 | if (cond != nil) { | |
1057 | action = build(O_TRACEON, (p->op == O_STOPI), | |
1058 | buildcmdlist(action)); | |
1059 | e = addevent(t, buildcmdlist(action)); | |
1060 | action->value.trace.event = e; | |
1061 | } else { | |
1062 | e = addevent(t, buildcmdlist(action)); | |
1063 | } | |
1064 | if (isstdin()) { | |
1065 | printevent(e); | |
1066 | } | |
1067 | } else { | |
1068 | stopinst(p->op, place, cond, action); | |
1069 | } | |
cccba246 ML |
1070 | } |
1071 | } | |
1072 | ||
40ea9b88 | 1073 | private stopinst(op, place, cond, action) |
cccba246 ML |
1074 | Operator op; |
1075 | Node place; | |
1076 | Node cond; | |
40ea9b88 | 1077 | Command action; |
cccba246 ML |
1078 | { |
1079 | Node event; | |
fd49257b | 1080 | Event e; |
cccba246 ML |
1081 | |
1082 | if (op == O_STOP) { | |
1083 | event = build(O_EQ, build(O_SYM, linesym), place); | |
1084 | } else { | |
1085 | event = build(O_EQ, build(O_SYM, pcsym), place); | |
1086 | } | |
40ea9b88 | 1087 | e = addevent(event, buildcmdlist(action)); |
fd49257b ML |
1088 | if (isstdin()) { |
1089 | printevent(e); | |
1090 | } | |
cccba246 ML |
1091 | } |
1092 | ||
1093 | /* | |
1094 | * Implement stopping on assignment to a variable by adding it to | |
1095 | * the variable list. | |
1096 | */ | |
1097 | ||
1098 | private stopvar(op, exp, place, cond) | |
1099 | Operator op; | |
1100 | Node exp; | |
1101 | Node place; | |
1102 | Node cond; | |
1103 | { | |
1104 | Symbol p; | |
1105 | Node event; | |
1106 | Command action; | |
1107 | ||
af28d1f8 ML |
1108 | if (place == nil) { |
1109 | if (exp->op == O_LCON) { | |
1110 | p = program; | |
1111 | } else { | |
1112 | p = tcontainer(exp); | |
1113 | if (p == nil) { | |
1114 | p = program; | |
1115 | } | |
1116 | } | |
1117 | } else { | |
1118 | p = place->value.sym; | |
1119 | } | |
1120 | action = build(O_STOPIFCHANGED, exp); | |
1121 | if (cond != nil) { | |
1122 | action = build(O_IF, cond, buildcmdlist(action)); | |
cccba246 | 1123 | } |
cccba246 ML |
1124 | action = build(O_TRACEON, (op == O_STOPI), buildcmdlist(action)); |
1125 | event = build(O_EQ, build(O_SYM, procsym), build(O_SYM, p)); | |
1126 | action->value.trace.event = addevent(event, buildcmdlist(action)); | |
fd49257b ML |
1127 | if (isstdin()) { |
1128 | printevent(action->value.trace.event); | |
1129 | } | |
cccba246 ML |
1130 | } |
1131 | ||
1132 | /* | |
1133 | * Assign the value of an expression to a variable (or term). | |
1134 | */ | |
1135 | ||
1136 | public assign(var, exp) | |
1137 | Node var; | |
1138 | Node exp; | |
1139 | { | |
1140 | Address addr; | |
2fd0f574 | 1141 | integer varsize, expsize; |
cccba246 ML |
1142 | char cvalue; |
1143 | short svalue; | |
1144 | long lvalue; | |
2fd0f574 | 1145 | float fvalue; |
cccba246 | 1146 | |
0022c355 ML |
1147 | if (var->op == O_SYM and regnum(var->value.sym) != -1) { |
1148 | eval(exp); | |
1149 | setreg(regnum(var->value.sym), pop(Address)); | |
cccba246 | 1150 | } else { |
0022c355 ML |
1151 | addr = lval(var); |
1152 | varsize = size(var->nodetype); | |
1153 | expsize = size(exp->nodetype); | |
1154 | eval(exp); | |
1155 | if (varsize == sizeof(float) and expsize == sizeof(double)) { | |
1156 | fvalue = (float) pop(double); | |
1157 | dwrite(&fvalue, addr, sizeof(fvalue)); | |
1158 | } else { | |
1159 | if (varsize < sizeof(long)) { | |
1160 | lvalue = 0; | |
1161 | popn(expsize, &lvalue); | |
1162 | if (varsize == sizeof(char)) { | |
2fd0f574 SL |
1163 | cvalue = lvalue; |
1164 | dwrite(&cvalue, addr, sizeof(cvalue)); | |
0022c355 | 1165 | } else if (varsize == sizeof(short)) { |
2fd0f574 SL |
1166 | svalue = lvalue; |
1167 | dwrite(&svalue, addr, sizeof(svalue)); | |
0022c355 ML |
1168 | } else { |
1169 | error("[internal error: bad size %d in assign]", varsize); | |
1170 | } | |
1171 | } else { | |
1172 | if (expsize <= varsize) { | |
1173 | sp -= expsize; | |
1174 | dwrite(sp, addr, expsize); | |
1175 | } else { | |
1176 | sp -= expsize; | |
1177 | dwrite(sp, addr, varsize); | |
1178 | } | |
2fd0f574 | 1179 | } |
0022c355 ML |
1180 | } |
1181 | } | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * Set a debugger variable. | |
1186 | */ | |
1187 | ||
1188 | private set (var, exp) | |
1189 | Node var, exp; | |
1190 | { | |
1191 | Symbol t; | |
1192 | ||
1193 | if (var == nil) { | |
1194 | defvar(nil, nil); | |
1195 | } else if (exp == nil) { | |
1196 | defvar(var->value.name, nil); | |
1197 | } else if (var->value.name == identname("$frame", true)) { | |
1198 | t = exp->nodetype; | |
1199 | if (not compatible(t, t_int) and not compatible(t, t_addr)) { | |
1200 | error("$frame must be an address"); | |
1201 | } | |
1202 | eval(exp); | |
1203 | getnewregs(pop(Address)); | |
1204 | } else { | |
1205 | defvar(var->value.name, unrval(exp)); | |
1206 | } | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * Execute a list command. | |
1211 | */ | |
1212 | ||
1213 | private list (p) | |
1214 | Node p; | |
1215 | { | |
1216 | Symbol f; | |
1217 | Address addr; | |
1218 | Lineno line, l1, l2; | |
1219 | ||
1220 | if (p->value.arg[0]->op == O_SYM) { | |
1221 | f = p->value.arg[0]->value.sym; | |
1222 | addr = firstline(f); | |
1223 | if (addr == NOADDR) { | |
1224 | error("no source lines for \"%s\"", symname(f)); | |
1225 | } | |
1226 | setsource(srcfilename(addr)); | |
1227 | line = srcline(addr); | |
1228 | getsrcwindow(line, &l1, &l2); | |
1229 | } else { | |
1230 | eval(p->value.arg[0]); | |
1231 | l1 = (Lineno) (pop(long)); | |
1232 | eval(p->value.arg[1]); | |
1233 | l2 = (Lineno) (pop(long)); | |
1234 | } | |
1235 | printlines(l1, l2); | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Execute a func command. | |
1240 | */ | |
1241 | ||
1242 | private func (p) | |
1243 | Node p; | |
1244 | { | |
1245 | Symbol s, f; | |
1246 | Address addr; | |
1247 | ||
1248 | if (p == nil) { | |
1249 | printname(stdout, curfunc); | |
1250 | putchar('\n'); | |
1251 | } else { | |
1252 | s = p->value.sym; | |
1253 | if (isroutine(s)) { | |
1254 | setcurfunc(s); | |
2fd0f574 | 1255 | } else { |
0022c355 ML |
1256 | find(f, s->name) where isroutine(f) endfind(f); |
1257 | if (f == nil) { | |
1258 | error("%s is not a procedure or function", symname(s)); | |
2fd0f574 | 1259 | } |
0022c355 ML |
1260 | setcurfunc(f); |
1261 | } | |
1262 | addr = codeloc(curfunc); | |
1263 | if (addr != NOADDR) { | |
1264 | setsource(srcfilename(addr)); | |
1265 | cursrcline = srcline(addr); | |
2fd0f574 | 1266 | } |
cccba246 ML |
1267 | } |
1268 | } | |
1269 | ||
cccba246 | 1270 | /* |
0022c355 | 1271 | * Send a message to the current support person. |
cccba246 ML |
1272 | */ |
1273 | ||
01ca13bf | 1274 | #ifdef MAINTAINER |
5992e69c JB |
1275 | static char maintainer[] = MAINTAINER; |
1276 | #else | |
1277 | static char maintainer[] = ""; | |
1278 | #endif | |
1279 | ||
cccba246 ML |
1280 | public gripe() |
1281 | { | |
1282 | typedef Operation(); | |
1283 | Operation *old; | |
af28d1f8 | 1284 | int pid, status; |
2fd0f574 SL |
1285 | extern int versionNumber; |
1286 | char subject[100]; | |
cccba246 | 1287 | |
5992e69c JB |
1288 | if (maintainer[0] == '\0') { |
1289 | puts("Gripes not supported at this site. Sorry."); | |
1290 | return; | |
1291 | } | |
cccba246 ML |
1292 | puts("Type control-D to end your message. Be sure to include"); |
1293 | puts("your name and the name of the file you are debugging."); | |
1294 | putchar('\n'); | |
1295 | old = signal(SIGINT, SIG_DFL); | |
0022c355 | 1296 | sprintf(subject, "dbx (version 3.%d) gripe", versionNumber); |
5992e69c | 1297 | pid = back("Mail", stdin, stdout, "-s", subject, maintainer, nil); |
af28d1f8 ML |
1298 | signal(SIGINT, SIG_IGN); |
1299 | pwait(pid, &status); | |
cccba246 | 1300 | signal(SIGINT, old); |
af28d1f8 ML |
1301 | if (status == 0) { |
1302 | puts("Thank you."); | |
1303 | } else { | |
1304 | puts("\nMail not sent."); | |
1305 | } | |
cccba246 ML |
1306 | } |
1307 | ||
1308 | /* | |
1309 | * Give the user some help. | |
1310 | */ | |
1311 | ||
1312 | public help() | |
1313 | { | |
1314 | puts("run - begin execution of the program"); | |
2fd0f574 SL |
1315 | puts("print <exp> - print the value of the expression"); |
1316 | puts("where - print currently active procedures"); | |
1317 | puts("stop at <line> - suspend execution at the line"); | |
1318 | puts("stop in <proc> - suspend execution when <proc> is called"); | |
cccba246 ML |
1319 | puts("cont - continue execution"); |
1320 | puts("step - single step one line"); | |
1321 | puts("next - step to next line (skip over calls)"); | |
1322 | puts("trace <line#> - trace execution of the line"); | |
1323 | puts("trace <proc> - trace calls to the procedure"); | |
1324 | puts("trace <var> - trace changes to the variable"); | |
1325 | puts("trace <exp> at <line#> - print <exp> when <line> is reached"); | |
cccba246 ML |
1326 | puts("status - print trace/stop's in effect"); |
1327 | puts("delete <number> - remove trace or stop of given number"); | |
2fd0f574 | 1328 | puts("call <proc> - call a procedure in program"); |
cccba246 ML |
1329 | puts("whatis <name> - print the declaration of the name"); |
1330 | puts("list <line>, <line> - list source lines"); | |
cccba246 ML |
1331 | puts("gripe - send mail to the person in charge of dbx"); |
1332 | puts("quit - exit dbx"); | |
1333 | } | |
1334 | ||
1335 | /* | |
1336 | * Divert output to the given file name. | |
1337 | * Cannot redirect to an existing file. | |
1338 | */ | |
1339 | ||
1340 | private int so_fd; | |
1341 | private Boolean notstdout; | |
1342 | ||
1343 | public setout(filename) | |
1344 | String filename; | |
1345 | { | |
1346 | File f; | |
1347 | ||
1348 | f = fopen(filename, "r"); | |
1349 | if (f != nil) { | |
1350 | fclose(f); | |
1351 | error("%s: file already exists", filename); | |
1352 | } else { | |
1353 | so_fd = dup(1); | |
1354 | close(1); | |
1355 | if (creat(filename, 0666) == nil) { | |
1356 | unsetout(); | |
1357 | error("can't create %s", filename); | |
1358 | } | |
1359 | notstdout = true; | |
1360 | } | |
1361 | } | |
1362 | ||
1363 | /* | |
1364 | * Revert output to standard output. | |
1365 | */ | |
1366 | ||
1367 | public unsetout() | |
1368 | { | |
1369 | fflush(stdout); | |
1370 | close(1); | |
1371 | if (dup(so_fd) != 1) { | |
1372 | panic("standard out dup failed"); | |
1373 | } | |
1374 | close(so_fd); | |
1375 | notstdout = false; | |
1376 | } | |
1377 | ||
1378 | /* | |
1379 | * Determine is standard output is currently being redirected | |
1380 | * to a file (as far as we know). | |
1381 | */ | |
1382 | ||
1383 | public Boolean isredirected() | |
1384 | { | |
1385 | return notstdout; | |
1386 | } |