Commit | Line | Data |
---|---|---|
4298caf5 ML |
1 | /* Copyright (c) 1982 Regents of the University of California */ |
2 | ||
e1f4dbca | 3 | static char sccsid[] = "@(#)events.c 1.4 (Berkeley) %G%"; |
4298caf5 ML |
4 | |
5 | /* | |
6 | * Event/breakpoint managment. | |
7 | */ | |
8 | ||
9 | #include "defs.h" | |
10 | #include "events.h" | |
11 | #include "main.h" | |
12 | #include "symbols.h" | |
13 | #include "tree.h" | |
14 | #include "eval.h" | |
15 | #include "source.h" | |
16 | #include "mappings.h" | |
2fd0f574 | 17 | #include "runtime.h" |
4298caf5 ML |
18 | #include "process.h" |
19 | #include "machine.h" | |
20 | #include "lists.h" | |
21 | ||
22 | #ifndef public | |
23 | typedef struct Event *Event; | |
24 | typedef struct Breakpoint *Breakpoint; | |
25 | ||
26 | Boolean inst_tracing; | |
27 | Boolean single_stepping; | |
28 | Boolean isstopped; | |
29 | ||
30 | #include "symbols.h" | |
31 | ||
32 | Symbol linesym; | |
33 | Symbol procsym; | |
34 | Symbol pcsym; | |
35 | Symbol retaddrsym; | |
36 | ||
37 | #define addevent(cond, cmdlist) event_alloc(false, cond, cmdlist) | |
38 | #define event_once(cond, cmdlist) event_alloc(true, cond, cmdlist) | |
39 | ||
40 | #endif | |
41 | ||
42 | struct Event { | |
43 | unsigned int id; | |
44 | Boolean temporary; | |
45 | Node condition; | |
46 | Cmdlist actions; | |
47 | }; | |
48 | ||
49 | struct Breakpoint { | |
50 | Event event; | |
51 | Address bpaddr; | |
52 | Lineno bpline; | |
53 | Cmdlist actions; | |
54 | }; | |
55 | ||
56 | typedef List Eventlist; | |
57 | typedef List Bplist; | |
58 | ||
59 | #define eventlist_append(event, el) list_append(list_item(event), nil, el) | |
60 | #define bplist_append(bp, bl) list_append(list_item(bp), nil, bl) | |
61 | ||
62 | private Eventlist eventlist; /* list of active events */ | |
63 | private Bplist bplist; /* list of active breakpoints */ | |
64 | private Integer eventid; /* id number of next allocated event */ | |
65 | private Integer trid; /* id number of next allocated trace */ | |
66 | ||
67 | typedef struct Trcmd { | |
68 | Integer trid; | |
69 | Event event; | |
70 | Cmdlist cmdlist; | |
71 | } *Trcmd; | |
72 | ||
73 | private List eachline; /* commands to execute after each line */ | |
74 | private List eachinst; /* commands to execute after each instruction */ | |
75 | ||
76 | private Breakpoint bp_alloc(); | |
77 | ||
78 | /* | |
79 | * Initialize breakpoint information. | |
80 | */ | |
81 | ||
82 | private Symbol builtinsym(str, class, type) | |
83 | String str; | |
84 | Symclass class; | |
85 | Symbol type; | |
86 | { | |
87 | Symbol s; | |
88 | ||
89 | s = insert(identname(str, true)); | |
90 | s->language = findlanguage(".s"); | |
91 | s->class = class; | |
92 | s->type = type; | |
93 | return s; | |
94 | } | |
95 | ||
96 | public bpinit() | |
97 | { | |
98 | linesym = builtinsym("$line", VAR, t_int); | |
99 | procsym = builtinsym("$proc", PROC, nil); | |
100 | pcsym = lookup(identname("$pc", true)); | |
101 | if (pcsym == nil) { | |
102 | panic("can't find $pc"); | |
103 | } | |
104 | retaddrsym = builtinsym("$retaddr", VAR, t_int); | |
105 | eventlist = list_alloc(); | |
106 | bplist = list_alloc(); | |
107 | eachline = list_alloc(); | |
108 | eachinst = list_alloc(); | |
109 | } | |
110 | ||
111 | /* | |
112 | * Trap an event and do the associated commands when it occurs. | |
113 | */ | |
114 | ||
115 | public Event event_alloc(istmp, econd, cmdlist) | |
116 | Boolean istmp; | |
117 | Node econd; | |
118 | Cmdlist cmdlist; | |
119 | { | |
120 | register Event e; | |
121 | ||
122 | e = new(Event); | |
123 | ++eventid; | |
124 | e->id = eventid; | |
125 | e->temporary = istmp; | |
126 | e->condition = econd; | |
127 | e->actions = cmdlist; | |
128 | eventlist_append(e, eventlist); | |
129 | translate(e); | |
130 | return e; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Delete the event with the given id. | |
2fd0f574 | 135 | * Returns whether it's successful or not. |
4298caf5 ML |
136 | */ |
137 | ||
2fd0f574 | 138 | public boolean delevent (id) |
4298caf5 ML |
139 | unsigned int id; |
140 | { | |
141 | Event e; | |
142 | Breakpoint bp; | |
143 | Trcmd t; | |
2fd0f574 | 144 | boolean found; |
4298caf5 | 145 | |
2fd0f574 | 146 | found = false; |
4298caf5 ML |
147 | foreach (Event, e, eventlist) |
148 | if (e->id == id) { | |
2fd0f574 | 149 | found = true; |
4298caf5 ML |
150 | foreach (Breakpoint, bp, bplist) |
151 | if (bp->event == e) { | |
2fd0f574 SL |
152 | if (tracebpts) { |
153 | printf("deleting breakpoint at 0x%x\n", bp->bpaddr); | |
154 | fflush(stdout); | |
155 | } | |
4298caf5 ML |
156 | list_delete(list_curitem(bplist), bplist); |
157 | } | |
158 | endfor | |
2fd0f574 | 159 | list_delete(list_curitem(eventlist), eventlist); |
4298caf5 ML |
160 | break; |
161 | } | |
162 | endfor | |
163 | foreach (Trcmd, t, eachline) | |
164 | if (t->event->id == id) { | |
2fd0f574 | 165 | found = true; |
4298caf5 ML |
166 | printrmtr(t); |
167 | list_delete(list_curitem(eachline), eachline); | |
168 | } | |
169 | endfor | |
170 | foreach (Trcmd, t, eachinst) | |
171 | if (t->event->id == id) { | |
2fd0f574 | 172 | found = true; |
4298caf5 ML |
173 | printrmtr(t); |
174 | list_delete(list_curitem(eachinst), eachinst); | |
175 | } | |
176 | endfor | |
177 | if (list_size(eachinst) == 0) { | |
178 | inst_tracing = false; | |
179 | if (list_size(eachline) == 0) { | |
180 | single_stepping = false; | |
181 | } | |
182 | } | |
2fd0f574 | 183 | return found; |
4298caf5 ML |
184 | } |
185 | ||
186 | /* | |
187 | * Translate an event into the appropriate breakpoints and actions. | |
188 | * While we're at it, turn on the breakpoints if the condition is true. | |
189 | */ | |
190 | ||
191 | private translate(e) | |
192 | Event e; | |
193 | { | |
194 | Breakpoint bp; | |
195 | Symbol s; | |
196 | Node place; | |
197 | Lineno line; | |
198 | Address addr; | |
199 | ||
200 | checkref(e->condition); | |
201 | switch (e->condition->op) { | |
202 | case O_EQ: | |
203 | if (e->condition->value.arg[0]->op == O_SYM) { | |
204 | s = e->condition->value.arg[0]->value.sym; | |
205 | place = e->condition->value.arg[1]; | |
206 | if (s == linesym) { | |
207 | if (place->op == O_QLINE) { | |
208 | line = place->value.arg[1]->value.lcon; | |
2fd0f574 | 209 | addr = objaddr(line, place->value.arg[0]->value.scon); |
4298caf5 ML |
210 | } else { |
211 | eval(place); | |
212 | line = pop(long); | |
213 | addr = objaddr(line, cursource); | |
214 | } | |
215 | if (addr == NOADDR) { | |
2fd0f574 SL |
216 | if (not delevent(e->id)) { |
217 | printf("!! dbx.translate: can't undo event %d?\n", | |
218 | e->id); | |
219 | } | |
4298caf5 ML |
220 | beginerrmsg(); |
221 | fprintf(stderr, "no executable code at line "); | |
222 | prtree(stderr, place); | |
223 | enderrmsg(); | |
224 | } | |
225 | bp = bp_alloc(e, addr, line, e->actions); | |
226 | } else if (s == procsym) { | |
227 | eval(place); | |
228 | s = pop(Symbol); | |
229 | bp = bp_alloc(e, codeloc(s), 0, e->actions); | |
230 | if (isactive(s) and pc != codeloc(program)) { | |
231 | evalcmdlist(e->actions); | |
232 | } | |
233 | } else if (s == pcsym) { | |
234 | eval(place); | |
235 | bp = bp_alloc(e, pop(Address), 0, e->actions); | |
236 | } else { | |
237 | condbp(e); | |
238 | } | |
239 | } else { | |
240 | condbp(e); | |
241 | } | |
242 | break; | |
243 | ||
244 | /* | |
245 | * These should be handled specially. | |
246 | * But for now I'm ignoring the problem. | |
247 | */ | |
248 | case O_AND: | |
249 | case O_OR: | |
250 | default: | |
251 | condbp(e); | |
252 | break; | |
253 | } | |
254 | } | |
255 | ||
256 | /* | |
257 | * Create a breakpoint for a condition that cannot be pinpointed | |
258 | * to happening at a particular address, but one for which we | |
259 | * must single step and check the condition after each statement. | |
260 | */ | |
261 | ||
262 | private condbp(e) | |
263 | Event e; | |
264 | { | |
265 | Symbol p; | |
266 | Breakpoint bp; | |
267 | Cmdlist actions; | |
268 | ||
269 | p = tcontainer(e->condition); | |
270 | if (p == nil) { | |
271 | p = program; | |
272 | } | |
273 | actions = buildcmdlist(build(O_IF, e->condition, e->actions)); | |
274 | actions = buildcmdlist(build(O_TRACEON, false, actions)); | |
275 | bp = bp_alloc(e, codeloc(p), 0, actions); | |
276 | } | |
277 | ||
278 | /* | |
279 | * Determine the deepest nested subprogram that still contains | |
280 | * all elements in the given expression. | |
281 | */ | |
282 | ||
283 | public Symbol tcontainer(exp) | |
284 | Node exp; | |
285 | { | |
286 | Integer i; | |
287 | Symbol s, t, u, v; | |
288 | ||
289 | checkref(exp); | |
290 | s = nil; | |
291 | if (exp->op == O_SYM) { | |
292 | s = container(exp->value.sym); | |
293 | } else if (not isleaf(exp->op)) { | |
294 | for (i = 0; i < nargs(exp->op); i++) { | |
295 | t = tcontainer(exp->value.arg[i]); | |
296 | if (t != nil) { | |
297 | if (s == nil) { | |
298 | s = t; | |
299 | } else { | |
300 | u = s; | |
301 | v = t; | |
302 | while (u != v and u != nil) { | |
303 | u = container(u); | |
304 | v = container(v); | |
305 | } | |
306 | if (u == nil) { | |
307 | panic("bad ancestry for \"%s\"", symname(s)); | |
308 | } else { | |
309 | s = u; | |
310 | } | |
311 | } | |
312 | } | |
313 | } | |
314 | } | |
315 | return s; | |
316 | } | |
317 | ||
e1bc702e ML |
318 | /* |
319 | * Determine if the given function can be executed at full speed. | |
320 | * This can only be done if there are no breakpoints within the function. | |
321 | */ | |
322 | ||
323 | public Boolean canskip(f) | |
324 | Symbol f; | |
325 | { | |
326 | Breakpoint p; | |
327 | Boolean ok; | |
328 | ||
329 | ok = true; | |
330 | foreach (Breakpoint, p, bplist) | |
331 | if (whatblock(p->bpaddr) == f) { | |
332 | ok = false; | |
333 | break; | |
334 | } | |
335 | endfor | |
336 | return ok; | |
337 | } | |
338 | ||
4298caf5 ML |
339 | /* |
340 | * Print out what's currently being traced by looking at | |
341 | * the currently active events. | |
342 | * | |
343 | * Some convolution here to translate internal representation | |
344 | * of events back into something more palatable. | |
345 | */ | |
346 | ||
347 | public status() | |
348 | { | |
349 | Event e; | |
4298caf5 ML |
350 | |
351 | foreach (Event, e, eventlist) | |
352 | if (not e->temporary) { | |
e1bc702e | 353 | printevent(e); |
4298caf5 ML |
354 | } |
355 | endfor | |
356 | } | |
357 | ||
e1bc702e ML |
358 | public printevent(e) |
359 | Event e; | |
360 | { | |
361 | Command cmd; | |
362 | ||
363 | if (not isredirected()) { | |
2fd0f574 | 364 | printeventid(e->id); |
e1bc702e ML |
365 | } |
366 | cmd = list_element(Command, list_head(e->actions)); | |
367 | if (cmd->op == O_PRINTCALL) { | |
368 | printf("trace "); | |
369 | printname(stdout, cmd->value.sym); | |
370 | } else { | |
371 | if (list_size(e->actions) > 1) { | |
372 | printf("{ "); | |
373 | } | |
374 | foreach (Command, cmd, e->actions) | |
375 | printcmd(stdout, cmd); | |
376 | if (not list_islast()) { | |
377 | printf("; "); | |
378 | } | |
379 | endfor | |
380 | if (list_size(e->actions) > 1) { | |
381 | printf(" }"); | |
382 | } | |
383 | printcond(e->condition); | |
384 | } | |
385 | printf("\n"); | |
386 | } | |
387 | ||
2fd0f574 SL |
388 | private printeventid (id) |
389 | integer id; | |
390 | { | |
391 | printf("[%d] ", id); | |
392 | } | |
393 | ||
4298caf5 ML |
394 | /* |
395 | * Print out a condition. | |
396 | */ | |
397 | ||
398 | private printcond(cond) | |
399 | Node cond; | |
400 | { | |
401 | Symbol s; | |
402 | Node place; | |
403 | ||
404 | if (cond->op == O_EQ and cond->value.arg[0]->op == O_SYM) { | |
405 | s = cond->value.arg[0]->value.sym; | |
406 | place = cond->value.arg[1]; | |
407 | if (s == procsym) { | |
408 | if (place->value.sym != program) { | |
409 | printf(" in "); | |
410 | printname(stdout, place->value.sym); | |
411 | } | |
412 | } else if (s == linesym) { | |
413 | printf(" at "); | |
414 | prtree(stdout, place); | |
415 | } else if (s == pcsym or s == retaddrsym) { | |
416 | printf("i at "); | |
417 | prtree(stdout, place); | |
418 | } else { | |
419 | printf(" when "); | |
420 | prtree(stdout, cond); | |
421 | } | |
422 | } else { | |
423 | printf(" when "); | |
424 | prtree(stdout, cond); | |
425 | } | |
426 | } | |
427 | ||
428 | /* | |
429 | * Add a breakpoint to the list and return it. | |
430 | */ | |
431 | ||
432 | private Breakpoint bp_alloc(e, addr, line, actions) | |
433 | Event e; | |
434 | Address addr; | |
435 | Lineno line; | |
436 | Cmdlist actions; | |
437 | { | |
438 | register Breakpoint p; | |
439 | ||
440 | p = new(Breakpoint); | |
441 | p->event = e; | |
442 | p->bpaddr = addr; | |
443 | p->bpline = line; | |
444 | p->actions = actions; | |
445 | if (tracebpts) { | |
2fd0f574 SL |
446 | if (e == nil) { |
447 | printf("new bp at 0x%x for event ??\n", addr, e->id); | |
448 | } else { | |
449 | printf("new bp at 0x%x for event %d\n", addr, e->id); | |
450 | } | |
4298caf5 ML |
451 | fflush(stdout); |
452 | } | |
453 | bplist_append(p, bplist); | |
454 | return p; | |
455 | } | |
456 | ||
457 | /* | |
458 | * Free all storage in the event and breakpoint tables. | |
459 | */ | |
460 | ||
461 | public bpfree() | |
462 | { | |
463 | register Event e; | |
464 | ||
465 | fixbps(); | |
466 | foreach (Event, e, eventlist) | |
2fd0f574 SL |
467 | if (not delevent(e->id)) { |
468 | printf("!! dbx.bpfree: can't delete event %d\n", e->id); | |
469 | } | |
4298caf5 ML |
470 | list_delete(list_curitem(eventlist), eventlist); |
471 | endfor | |
472 | } | |
473 | ||
474 | /* | |
475 | * Determine if the program stopped at a known breakpoint | |
476 | * and if so do the associated commands. | |
477 | */ | |
478 | ||
479 | public Boolean bpact() | |
480 | { | |
481 | register Breakpoint p; | |
482 | Boolean found; | |
2fd0f574 | 483 | integer eventId; |
4298caf5 ML |
484 | |
485 | found = false; | |
486 | foreach (Breakpoint, p, bplist) | |
487 | if (p->bpaddr == pc) { | |
488 | if (tracebpts) { | |
2fd0f574 SL |
489 | printf("breakpoint for event %d found at location 0x%x\n", |
490 | p->event->id, pc); | |
4298caf5 ML |
491 | } |
492 | found = true; | |
493 | if (p->event->temporary) { | |
2fd0f574 SL |
494 | if (not delevent(p->event->id)) { |
495 | printf("!! dbx.bpact: can't find event %d\n", | |
496 | p->event->id); | |
497 | } | |
4298caf5 ML |
498 | } |
499 | evalcmdlist(p->actions); | |
2fd0f574 SL |
500 | if (isstopped) { |
501 | eventId = p->event->id; | |
502 | } | |
4298caf5 ML |
503 | } |
504 | endfor | |
505 | if (isstopped) { | |
2fd0f574 SL |
506 | if (found) { |
507 | printeventid(eventId); | |
508 | } | |
4298caf5 ML |
509 | printstatus(); |
510 | } | |
511 | fflush(stdout); | |
512 | return found; | |
513 | } | |
514 | ||
515 | /* | |
516 | * Begin single stepping and executing the given commands after each step. | |
517 | * If the first argument is true step by instructions, otherwise | |
518 | * step by source lines. | |
519 | * | |
520 | * We automatically set a breakpoint at the end of the current procedure | |
521 | * to turn off the given tracing. | |
522 | */ | |
523 | ||
524 | public traceon(inst, event, cmdlist) | |
525 | Boolean inst; | |
526 | Event event; | |
527 | Cmdlist cmdlist; | |
528 | { | |
529 | register Trcmd trcmd; | |
530 | Breakpoint bp; | |
4298caf5 | 531 | Cmdlist actions; |
e1bc702e | 532 | Address ret; |
4298caf5 ML |
533 | |
534 | trcmd = new(Trcmd); | |
535 | ++trid; | |
536 | trcmd->trid = trid; | |
537 | trcmd->event = event; | |
538 | trcmd->cmdlist = cmdlist; | |
539 | single_stepping = true; | |
540 | if (inst) { | |
541 | inst_tracing = true; | |
542 | list_append(list_item(trcmd), nil, eachinst); | |
543 | } else { | |
544 | list_append(list_item(trcmd), nil, eachline); | |
545 | } | |
e1bc702e ML |
546 | ret = return_addr(); |
547 | if (ret != 0) { | |
e1bc702e | 548 | actions = buildcmdlist(build(O_TRACEOFF, trcmd->trid)); |
2fd0f574 | 549 | bp = bp_alloc(event, (Address) ret, 0, actions); |
e1bc702e | 550 | } |
4298caf5 ML |
551 | if (tracebpts) { |
552 | printf("adding trace %d for event %d\n", trcmd->trid, event->id); | |
553 | } | |
554 | } | |
555 | ||
556 | /* | |
557 | * Turn off some kind of tracing. | |
558 | * Strictly an internal command, this cannot be invoked by the user. | |
559 | */ | |
560 | ||
561 | public traceoff(id) | |
562 | Integer id; | |
563 | { | |
564 | register Trcmd t; | |
565 | register Boolean found; | |
566 | ||
567 | found = false; | |
568 | foreach (Trcmd, t, eachline) | |
569 | if (t->trid == id) { | |
570 | printrmtr(t); | |
571 | list_delete(list_curitem(eachline), eachline); | |
572 | found = true; | |
573 | break; | |
574 | } | |
575 | endfor | |
576 | if (not found) { | |
577 | foreach (Trcmd, t, eachinst) | |
578 | if (t->event->id == id) { | |
579 | printrmtr(t); | |
580 | list_delete(list_curitem(eachinst), eachinst); | |
581 | found = true; | |
582 | break; | |
583 | } | |
584 | endfor | |
585 | if (not found) { | |
586 | panic("missing trid %d", id); | |
587 | } | |
588 | } | |
589 | if (list_size(eachinst) == 0) { | |
590 | inst_tracing = false; | |
591 | if (list_size(eachline) == 0) { | |
592 | single_stepping = false; | |
593 | } | |
594 | } | |
595 | } | |
596 | ||
597 | /* | |
598 | * If breakpoints are being traced, note that a Trcmd is being deleted. | |
599 | */ | |
600 | ||
601 | private printrmtr(t) | |
602 | Trcmd t; | |
603 | { | |
604 | if (tracebpts) { | |
e1bc702e ML |
605 | printf("removing trace %d", t->trid); |
606 | if (t->event != nil) { | |
607 | printf(" for event %d", t->event->id); | |
608 | } | |
609 | printf("\n"); | |
4298caf5 ML |
610 | } |
611 | } | |
612 | ||
613 | /* | |
614 | * Print out news during single step tracing. | |
615 | */ | |
616 | ||
617 | public printnews() | |
618 | { | |
619 | register Trcmd t; | |
620 | ||
621 | foreach (Trcmd, t, eachline) | |
622 | evalcmdlist(t->cmdlist); | |
623 | endfor | |
624 | foreach (Trcmd, t, eachinst) | |
625 | evalcmdlist(t->cmdlist); | |
626 | endfor | |
627 | bpact(); | |
628 | } | |
629 | ||
630 | /* | |
631 | * A procedure call/return has occurred while single-stepping, | |
632 | * note it if we're tracing lines. | |
633 | */ | |
634 | ||
635 | private Boolean chklist(); | |
636 | ||
637 | public callnews(iscall) | |
638 | Boolean iscall; | |
639 | { | |
640 | if (not chklist(eachline, iscall)) { | |
641 | chklist(eachinst, iscall); | |
642 | } | |
643 | } | |
644 | ||
645 | private Boolean chklist(list, iscall) | |
646 | List list; | |
647 | Boolean iscall; | |
648 | { | |
649 | register Trcmd t; | |
650 | register Command cmd; | |
651 | ||
2fd0f574 | 652 | setcurfunc(whatblock(pc)); |
4298caf5 ML |
653 | foreach (Trcmd, t, list) |
654 | foreach (Command, cmd, t->cmdlist) | |
655 | if (cmd->op == O_PRINTSRCPOS and | |
656 | (cmd->value.arg[0] == nil or cmd->value.arg[0]->op == O_QLINE)) { | |
4298caf5 ML |
657 | if (iscall) { |
658 | printentry(curfunc); | |
659 | } else { | |
660 | printexit(curfunc); | |
661 | } | |
662 | return true; | |
663 | } | |
664 | endfor | |
665 | endfor | |
666 | return false; | |
667 | } | |
668 | ||
669 | /* | |
670 | * When tracing variables we keep a copy of their most recent value | |
671 | * and compare it to the current one each time a breakpoint occurs. | |
672 | * MAXTRSIZE is the maximum size variable we allow. | |
673 | */ | |
674 | ||
675 | #define MAXTRSIZE 512 | |
676 | ||
677 | /* | |
678 | * List of variables being watched. | |
679 | */ | |
680 | ||
681 | typedef struct Trinfo *Trinfo; | |
682 | ||
683 | struct Trinfo { | |
684 | Node variable; | |
685 | Address traddr; | |
686 | Symbol trblock; | |
687 | char *trvalue; | |
688 | }; | |
689 | ||
690 | private List trinfolist; | |
691 | ||
692 | /* | |
693 | * Find the trace information record associated with the given record. | |
694 | * If there isn't one then create it and add it to the list. | |
695 | */ | |
696 | ||
697 | private Trinfo findtrinfo(p) | |
698 | Node p; | |
699 | { | |
700 | register Trinfo tp; | |
701 | Boolean isnew; | |
702 | ||
703 | isnew = true; | |
704 | if (trinfolist == nil) { | |
705 | trinfolist = list_alloc(); | |
706 | } else { | |
707 | foreach (Trinfo, tp, trinfolist) | |
708 | if (tp->variable == p) { | |
709 | isnew = false; | |
710 | break; | |
711 | } | |
712 | endfor | |
713 | } | |
714 | if (isnew) { | |
715 | if (tracebpts) { | |
716 | printf("adding trinfo for \""); | |
717 | prtree(stdout, p); | |
718 | printf("\"\n"); | |
719 | } | |
720 | tp = new(Trinfo); | |
721 | tp->variable = p; | |
722 | tp->traddr = lval(p); | |
723 | tp->trvalue = nil; | |
724 | list_append(list_item(tp), nil, trinfolist); | |
725 | } | |
726 | return tp; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Print out the value of a variable if it has changed since the | |
731 | * last time we checked. | |
732 | */ | |
733 | ||
734 | public printifchanged(p) | |
735 | Node p; | |
736 | { | |
737 | register Trinfo tp; | |
738 | register int n; | |
739 | char buff[MAXTRSIZE]; | |
740 | static Lineno prevline; | |
741 | ||
742 | tp = findtrinfo(p); | |
743 | n = size(p->nodetype); | |
744 | dread(buff, tp->traddr, n); | |
745 | if (tp->trvalue == nil) { | |
746 | tp->trvalue = newarr(char, n); | |
747 | mov(buff, tp->trvalue, n); | |
748 | mov(buff, sp, n); | |
749 | sp += n; | |
750 | printf("initially (at line %d):\t", curline); | |
751 | prtree(stdout, p); | |
752 | printf(" = "); | |
753 | printval(p->nodetype); | |
754 | putchar('\n'); | |
755 | } else if (cmp(tp->trvalue, buff, n) != 0) { | |
756 | mov(buff, tp->trvalue, n); | |
757 | mov(buff, sp, n); | |
758 | sp += n; | |
759 | printf("after line %d:\t", prevline); | |
760 | prtree(stdout, p); | |
761 | printf(" = "); | |
762 | printval(p->nodetype); | |
763 | putchar('\n'); | |
764 | } | |
765 | prevline = curline; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Stop if the value of the given expression has changed. | |
770 | */ | |
771 | ||
772 | public stopifchanged(p) | |
773 | Node p; | |
774 | { | |
775 | register Trinfo tp; | |
776 | register int n; | |
777 | char buff[MAXTRSIZE]; | |
778 | static Lineno prevline; | |
779 | ||
780 | tp = findtrinfo(p); | |
781 | n = size(p->nodetype); | |
782 | dread(buff, tp->traddr, n); | |
783 | if (tp->trvalue == nil) { | |
784 | tp->trvalue = newarr(char, n); | |
785 | mov(buff, tp->trvalue, n); | |
786 | isstopped = true; | |
787 | } else if (cmp(tp->trvalue, buff, n) != 0) { | |
788 | mov(buff, tp->trvalue, n); | |
2fd0f574 SL |
789 | mov(buff, sp, n); |
790 | sp += n; | |
791 | printf("after line %d:\t", prevline); | |
792 | prtree(stdout, p); | |
793 | printf(" = "); | |
794 | printval(p->nodetype); | |
795 | putchar('\n'); | |
4298caf5 ML |
796 | isstopped = true; |
797 | } | |
798 | prevline = curline; | |
799 | } | |
800 | ||
801 | /* | |
802 | * Free the tracing table. | |
803 | */ | |
804 | ||
805 | public trfree() | |
806 | { | |
807 | register Trinfo tp; | |
808 | ||
809 | foreach (Trinfo, tp, trinfolist) | |
810 | dispose(tp->trvalue); | |
811 | dispose(tp); | |
812 | list_delete(list_curitem(trinfolist), trinfolist); | |
813 | endfor | |
814 | } | |
815 | ||
816 | /* | |
817 | * Fix up breakpoint information before continuing execution. | |
818 | * | |
819 | * It's necessary to destroy events and breakpoints that were created | |
820 | * temporarily and still exist because the program terminated abnormally. | |
821 | */ | |
822 | ||
823 | public fixbps() | |
824 | { | |
825 | register Event e; | |
826 | register Trcmd t; | |
827 | ||
828 | single_stepping = false; | |
829 | inst_tracing = false; | |
830 | trfree(); | |
831 | foreach (Event, e, eventlist) | |
832 | if (e->temporary) { | |
2fd0f574 SL |
833 | if (not delevent(e->id)) { |
834 | printf("!! dbx.fixbps: can't find event %d\n", e->id); | |
835 | } | |
4298caf5 ML |
836 | } |
837 | endfor | |
838 | foreach (Trcmd, t, eachline) | |
839 | printrmtr(t); | |
840 | list_delete(list_curitem(eachline), eachline); | |
841 | endfor | |
842 | foreach (Trcmd, t, eachinst) | |
843 | printrmtr(t); | |
844 | list_delete(list_curitem(eachinst), eachinst); | |
845 | endfor | |
846 | } | |
847 | ||
848 | /* | |
849 | * Set all breakpoints in object code. | |
850 | */ | |
851 | ||
852 | public setallbps() | |
853 | { | |
854 | register Breakpoint p; | |
855 | ||
856 | foreach (Breakpoint, p, bplist) | |
857 | setbp(p->bpaddr); | |
858 | endfor | |
859 | } | |
860 | ||
861 | /* | |
862 | * Undo damage done by "setallbps". | |
863 | */ | |
864 | ||
865 | public unsetallbps() | |
866 | { | |
867 | register Breakpoint p; | |
868 | ||
869 | foreach (Breakpoint, p, bplist) | |
870 | unsetbp(p->bpaddr); | |
871 | endfor | |
872 | } |