Commit | Line | Data |
---|---|---|
381c0f0e | 1 | |
52646e6f ML |
2 | /* Copyright (c) 1982 Regents of the University of California */ |
3 | ||
e1f4dbca | 4 | static char sccsid[] = "@(#)runtime.vax.c 1.11 (Berkeley) %G%"; |
52646e6f ML |
5 | |
6 | /* | |
7 | * Runtime organization dependent routines, mostly dealing with | |
8 | * activation records. | |
9 | */ | |
10 | ||
11 | #include "defs.h" | |
12 | #include "runtime.h" | |
13 | #include "process.h" | |
14 | #include "machine.h" | |
15 | #include "events.h" | |
16 | #include "mappings.h" | |
17 | #include "symbols.h" | |
18 | #include "tree.h" | |
19 | #include "eval.h" | |
20 | #include "operators.h" | |
21 | #include "object.h" | |
381c0f0e | 22 | #include <sys/param.h> |
52646e6f ML |
23 | |
24 | #ifndef public | |
25 | typedef struct Frame *Frame; | |
26 | ||
27 | #include "machine.h" | |
28 | #endif | |
29 | ||
30 | #define NSAVEREG 12 | |
31 | ||
32 | struct Frame { | |
33 | Integer condition_handler; | |
34 | Integer mask; | |
35 | Address save_ap; /* argument pointer */ | |
36 | Address save_fp; /* frame pointer */ | |
37 | Address save_pc; /* program counter */ | |
38 | Word save_reg[NSAVEREG]; /* not necessarily there */ | |
39 | }; | |
40 | ||
2fd0f574 SL |
41 | private Frame curframe = nil; |
42 | private struct Frame curframerec; | |
52646e6f ML |
43 | private Boolean walkingstack = false; |
44 | ||
2fd0f574 SL |
45 | #define frameeq(f1, f2) ((f1)->save_fp == (f2)->save_fp) |
46 | ||
52646e6f ML |
47 | /* |
48 | * Set a frame to the current activation record. | |
49 | */ | |
50 | ||
51 | private getcurframe(frp) | |
52 | register Frame frp; | |
53 | { | |
54 | register int i; | |
55 | ||
56 | checkref(frp); | |
57 | frp->mask = reg(NREG); | |
58 | frp->save_ap = reg(ARGP); | |
59 | frp->save_fp = reg(FRP); | |
551efd5b | 60 | frp->save_pc = reg(PROGCTR) + 1; |
52646e6f ML |
61 | for (i = 0; i < NSAVEREG; i++) { |
62 | frp->save_reg[i] = reg(i); | |
63 | } | |
64 | } | |
65 | ||
66 | /* | |
67 | * Return a pointer to the next activation record up the stack. | |
68 | * Return nil if there is none. | |
69 | * Writes over space pointed to by given argument. | |
70 | */ | |
71 | ||
72 | #define bis(b, n) ((b & (1 << (n))) != 0) | |
73 | ||
74 | private Frame nextframe(frp) | |
75 | Frame frp; | |
76 | { | |
77 | register Frame newfrp; | |
78 | struct Frame frame; | |
79 | register Integer i, j, mask; | |
381c0f0e | 80 | Address prev_frame, callpc; |
316d2228 | 81 | static Integer ntramp = 0; |
52646e6f ML |
82 | |
83 | newfrp = frp; | |
381c0f0e AF |
84 | prev_frame = frp->save_fp; |
85 | ||
316d2228 ML |
86 | /* |
87 | * The check for interrupt generated frames is taken from adb with only | |
88 | * partial understanding. If you're in "sub" and on a sigxxx "sigsub" | |
89 | * gets control, then the stack does NOT look like <main, sub, sigsub>. | |
381c0f0e AF |
90 | * |
91 | * As best I can make out it looks like: | |
316d2228 ML |
92 | * |
93 | * <main, (machine check exception block + sub), sysframe, sigsub>. | |
94 | * | |
95 | * When the signal occurs an exception block and a frame for the routine | |
96 | * in which it occured are pushed on the user stack. Then another frame | |
97 | * is pushed corresponding to a call from the kernel to sigsub. | |
381c0f0e AF |
98 | * |
99 | * The addr in sub at which the exception occured is not in sub.save_pc | |
316d2228 | 100 | * but in the machine check exception block. It is at the magic address |
8d44f3a5 | 101 | * fp + 84. |
381c0f0e AF |
102 | * |
103 | * The current approach ignores the sys_frame (what adb reports as sigtramp) | |
316d2228 ML |
104 | * and takes the pc for sub from the exception block. This allows the |
105 | * "where" command to report <main, sub, sigsub>, which seems reasonable. | |
381c0f0e | 106 | */ |
381c0f0e | 107 | |
316d2228 ML |
108 | nextf: |
109 | dread(&frame, prev_frame, sizeof(struct Frame)); | |
110 | if (ntramp == 1) { | |
8d44f3a5 | 111 | dread(&callpc, prev_frame + 84, sizeof(callpc)); |
316d2228 ML |
112 | } else { |
113 | callpc = frame.save_pc; | |
114 | } | |
52646e6f ML |
115 | if (frame.save_fp == nil) { |
116 | newfrp = nil; | |
316d2228 | 117 | } else if (callpc > 0x80000000 - 0x200 * UPAGES ) { |
381c0f0e AF |
118 | ntramp++; |
119 | prev_frame = frame.save_fp; | |
120 | goto nextf; | |
316d2228 | 121 | } else { |
381c0f0e | 122 | frame.save_pc = callpc; |
316d2228 | 123 | ntramp = 0; |
52646e6f ML |
124 | mask = ((frame.mask >> 16) & 0x0fff); |
125 | j = 0; | |
126 | for (i = 0; i < NSAVEREG; i++) { | |
127 | if (bis(mask, i)) { | |
128 | newfrp->save_reg[i] = frame.save_reg[j]; | |
129 | ++j; | |
130 | } | |
131 | } | |
132 | newfrp->condition_handler = frame.condition_handler; | |
133 | newfrp->mask = mask; | |
134 | newfrp->save_ap = frame.save_ap; | |
135 | newfrp->save_fp = frame.save_fp; | |
136 | newfrp->save_pc = frame.save_pc; | |
137 | } | |
138 | return newfrp; | |
139 | } | |
140 | ||
2fd0f574 SL |
141 | /* |
142 | * Get the current frame information in the given Frame and store the | |
143 | * associated function in the given value-result parameter. | |
144 | */ | |
145 | ||
146 | private getcurfunc (frp, fp) | |
147 | Frame frp; | |
148 | Symbol *fp; | |
149 | { | |
150 | getcurframe(frp); | |
151 | *fp = whatblock(frp->save_pc); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Return the frame associated with the next function up the call stack, or | |
156 | * nil if there is none. The function is returned in a value-result parameter. | |
157 | * For "inline" functions the statically outer function and same frame | |
158 | * are returned. | |
159 | */ | |
160 | ||
161 | private Frame nextfunc (frp, fp) | |
162 | Frame frp; | |
163 | Symbol *fp; | |
164 | { | |
165 | Symbol t; | |
166 | Frame nfrp; | |
167 | ||
168 | t = *fp; | |
169 | checkref(t); | |
170 | if (isinline(t)) { | |
171 | t = container(t); | |
172 | nfrp = frp; | |
173 | } else { | |
174 | nfrp = nextframe(frp); | |
175 | if (nfrp == nil) { | |
176 | t = nil; | |
177 | } else { | |
178 | t = whatblock(nfrp->save_pc); | |
179 | } | |
180 | } | |
181 | *fp = t; | |
182 | return nfrp; | |
183 | } | |
184 | ||
52646e6f ML |
185 | /* |
186 | * Return the frame associated with the given function. | |
187 | * If the function is nil, return the most recently activated frame. | |
188 | * | |
189 | * Static allocation for the frame. | |
190 | */ | |
191 | ||
192 | public Frame findframe(f) | |
193 | Symbol f; | |
194 | { | |
195 | register Frame frp; | |
196 | static struct Frame frame; | |
4fd956ac | 197 | Symbol p; |
52646e6f ML |
198 | |
199 | frp = &frame; | |
200 | getcurframe(frp); | |
912533aa SL |
201 | if (f == nil) |
202 | return (frp); | |
203 | /* | |
204 | * Starting at the current stack frame, | |
205 | * walk backwards looking for a symbol | |
206 | * match. Beware of local blocks which | |
207 | * have a back pointer but no stack frame. | |
208 | */ | |
209 | p = whatblock(frp->save_pc); | |
210 | while (p != f) { | |
211 | if (p == program) { | |
212 | frp = nil; | |
213 | break; | |
214 | } | |
215 | if (isinline(p)) { | |
216 | p = container(p); | |
217 | continue; | |
218 | } | |
219 | frp = nextframe(frp); | |
220 | if (frp == nil) | |
221 | break; | |
222 | p = whatblock(frp->save_pc); | |
52646e6f | 223 | } |
912533aa | 224 | return (frp); |
52646e6f ML |
225 | } |
226 | ||
227 | /* | |
228 | * Find the return address of the current procedure/function. | |
229 | */ | |
230 | ||
231 | public Address return_addr() | |
232 | { | |
233 | Frame frp; | |
234 | Address addr; | |
235 | struct Frame frame; | |
236 | ||
237 | frp = &frame; | |
238 | getcurframe(frp); | |
239 | frp = nextframe(frp); | |
240 | if (frp == nil) { | |
241 | addr = 0; | |
242 | } else { | |
243 | addr = frp->save_pc; | |
244 | } | |
245 | return addr; | |
246 | } | |
247 | ||
248 | /* | |
249 | * Push the value associated with the current function. | |
250 | */ | |
251 | ||
252 | public pushretval(len, isindirect) | |
253 | Integer len; | |
254 | Boolean isindirect; | |
255 | { | |
256 | Word r0; | |
257 | ||
258 | r0 = reg(0); | |
259 | if (isindirect) { | |
260 | rpush((Address) r0, len); | |
261 | } else { | |
262 | switch (len) { | |
263 | case sizeof(char): | |
264 | push(char, r0); | |
265 | break; | |
266 | ||
267 | case sizeof(short): | |
268 | push(short, r0); | |
269 | break; | |
270 | ||
271 | default: | |
272 | if (len == sizeof(Word)) { | |
273 | push(Word, r0); | |
274 | } else if (len == 2*sizeof(Word)) { | |
275 | push(Word, r0); | |
276 | push(Word, reg(1)); | |
277 | } else { | |
278 | panic("not indirect in pushretval?"); | |
279 | } | |
280 | break; | |
281 | } | |
282 | } | |
283 | } | |
284 | ||
285 | /* | |
286 | * Return the base address for locals in the given frame. | |
287 | */ | |
288 | ||
289 | public Address locals_base(frp) | |
290 | register Frame frp; | |
291 | { | |
292 | return (frp == nil) ? reg(FRP) : frp->save_fp; | |
293 | } | |
294 | ||
295 | /* | |
296 | * Return the base address for arguments in the given frame. | |
297 | */ | |
298 | ||
299 | public Address args_base(frp) | |
300 | register Frame frp; | |
301 | { | |
302 | return (frp == nil) ? reg(ARGP) : frp->save_ap; | |
303 | } | |
304 | ||
305 | /* | |
306 | * Return saved register n from the given frame. | |
307 | */ | |
308 | ||
309 | public Word savereg(n, frp) | |
310 | register Integer n; | |
311 | register Frame frp; | |
312 | { | |
313 | register Word w; | |
314 | ||
315 | if (frp == nil) { | |
316 | w = reg(n); | |
317 | } else { | |
318 | switch (n) { | |
319 | case ARGP: | |
320 | w = frp->save_ap; | |
321 | break; | |
322 | ||
323 | case FRP: | |
324 | w = frp->save_fp; | |
325 | break; | |
326 | ||
327 | case STKP: | |
328 | w = reg(STKP); | |
329 | break; | |
330 | ||
331 | case PROGCTR: | |
332 | w = frp->save_pc; | |
333 | break; | |
334 | ||
335 | default: | |
336 | assert(n >= 0 and n < NSAVEREG); | |
337 | w = frp->save_reg[n]; | |
338 | break; | |
339 | } | |
340 | } | |
341 | return w; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Return the nth argument to the current procedure. | |
346 | */ | |
347 | ||
348 | public Word argn(n, frp) | |
349 | Integer n; | |
350 | Frame frp; | |
351 | { | |
352 | Word w; | |
353 | ||
354 | dread(&w, args_base(frp) + (n * sizeof(Word)), sizeof(w)); | |
355 | return w; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Calculate the entry address for a procedure or function parameter, | |
360 | * given the address of the descriptor. | |
361 | */ | |
362 | ||
363 | public Address fparamaddr(a) | |
364 | Address a; | |
365 | { | |
366 | Address r; | |
367 | ||
368 | dread(&r, a, sizeof(r)); | |
369 | return r; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Print a list of currently active blocks starting with most recent. | |
374 | */ | |
375 | ||
376 | public wherecmd() | |
377 | { | |
378 | walkstack(false); | |
379 | } | |
380 | ||
381 | /* | |
382 | * Dump the world to the given file. | |
383 | * Like "where", but variables are dumped also. | |
384 | */ | |
385 | ||
386 | public dump() | |
387 | { | |
388 | walkstack(true); | |
389 | } | |
390 | ||
391 | /* | |
392 | * Walk the stack of active procedures printing information | |
393 | * about each active procedure. | |
394 | */ | |
395 | ||
52646e6f ML |
396 | private walkstack(dumpvariables) |
397 | Boolean dumpvariables; | |
398 | { | |
399 | register Frame frp; | |
52646e6f ML |
400 | register Boolean save; |
401 | register Lineno line; | |
2fd0f574 | 402 | Symbol f; |
52646e6f ML |
403 | struct Frame frame; |
404 | ||
405 | if (notstarted(process)) { | |
406 | error("program is not active"); | |
407 | } else { | |
408 | save = walkingstack; | |
409 | walkingstack = true; | |
410 | frp = &frame; | |
2fd0f574 | 411 | getcurfunc(frp, &f); |
52646e6f ML |
412 | do { |
413 | printf("%s", symname(f)); | |
92167553 ML |
414 | if (not isinline(f)) { |
415 | printparams(f, frp); | |
416 | } | |
91df78fa | 417 | line = srcline(frp->save_pc - 1); |
52646e6f ML |
418 | if (line != 0) { |
419 | printf(", line %d", line); | |
91df78fa | 420 | printf(" in \"%s\"\n", srcfilename(frp->save_pc - 1)); |
52646e6f ML |
421 | } else { |
422 | printf(" at 0x%x\n", frp->save_pc); | |
423 | } | |
424 | if (dumpvariables) { | |
425 | dumpvars(f, frp); | |
426 | putchar('\n'); | |
427 | } | |
2fd0f574 | 428 | frp = nextfunc(frp, &f); |
4fd956ac | 429 | } while (frp != nil and f != program); |
52646e6f ML |
430 | if (dumpvariables) { |
431 | printf("in \"%s\":\n", symname(program)); | |
432 | dumpvars(program, nil); | |
433 | putchar('\n'); | |
434 | } | |
435 | walkingstack = save; | |
436 | } | |
437 | } | |
438 | ||
2fd0f574 SL |
439 | /* |
440 | * Set the current function to the given symbol. | |
441 | * We must adjust "curframe" so that subsequent operations are | |
442 | * not confused; for simplicity we simply clear it. | |
443 | */ | |
444 | ||
445 | public setcurfunc (f) | |
446 | Symbol f; | |
447 | { | |
448 | curfunc = f; | |
449 | curframe = nil; | |
450 | } | |
451 | ||
452 | /* | |
453 | * Set curfunc to be N up/down the stack from its current value. | |
454 | */ | |
455 | ||
456 | public up (n) | |
457 | integer n; | |
458 | { | |
459 | integer i; | |
460 | Symbol f; | |
461 | Frame frp; | |
462 | boolean done; | |
463 | ||
464 | if (not isactive(program)) { | |
465 | error("program is not active"); | |
466 | } else if (curfunc == nil) { | |
467 | error("no current function"); | |
468 | } else { | |
469 | i = 0; | |
470 | f = curfunc; | |
471 | if (curframe != nil) { | |
472 | frp = curframe; | |
473 | } else { | |
474 | frp = findframe(f); | |
475 | } | |
476 | done = false; | |
477 | do { | |
478 | if (frp == nil) { | |
479 | done = true; | |
480 | error("not that many levels"); | |
481 | } else if (i >= n) { | |
482 | done = true; | |
483 | curfunc = f; | |
484 | curframe = &curframerec; | |
485 | *curframe = *frp; | |
486 | } else if (f == program) { | |
487 | done = true; | |
488 | error("not that many levels"); | |
489 | } else { | |
490 | frp = nextfunc(frp, &f); | |
491 | } | |
492 | ++i; | |
493 | } while (not done); | |
494 | } | |
495 | } | |
496 | ||
497 | public down (n) | |
498 | integer n; | |
499 | { | |
500 | integer i, depth; | |
501 | register Frame frp; | |
502 | Symbol f; | |
503 | struct Frame frame; | |
504 | ||
505 | if (not isactive(program)) { | |
506 | error("program is not active"); | |
507 | } else if (curfunc == nil) { | |
508 | error("no current function"); | |
509 | } else { | |
510 | depth = 0; | |
511 | frp = &frame; | |
512 | getcurfunc(frp, &f); | |
513 | if (curframe == nil) { | |
514 | curframe = &curframerec; | |
515 | *curframe = *(findframe(curfunc)); | |
516 | } | |
517 | while ((f != curfunc or !frameeq(frp, curframe)) and f != nil) { | |
518 | frp = nextfunc(frp, &f); | |
519 | ++depth; | |
520 | } | |
521 | if (f == nil or n > depth) { | |
522 | error("not that many levels"); | |
523 | } else { | |
524 | depth -= n; | |
525 | frp = &frame; | |
526 | getcurfunc(frp, &f); | |
527 | for (i = 0; i < depth; i++) { | |
528 | frp = nextfunc(frp, &f); | |
529 | assert(frp != nil); | |
530 | } | |
531 | curfunc = f; | |
532 | *curframe = *frp; | |
533 | } | |
534 | } | |
535 | } | |
536 | ||
52646e6f ML |
537 | /* |
538 | * Find the entry point of a procedure or function. | |
539 | */ | |
540 | ||
541 | public findbeginning(f) | |
542 | Symbol f; | |
543 | { | |
2fd0f574 SL |
544 | if (isinternal(f)) { |
545 | f->symvalue.funcv.beginaddr += 15; | |
546 | } else { | |
547 | f->symvalue.funcv.beginaddr += 2; | |
548 | } | |
52646e6f ML |
549 | } |
550 | ||
551 | /* | |
552 | * Return the address corresponding to the first line in a function. | |
553 | */ | |
554 | ||
555 | public Address firstline(f) | |
556 | Symbol f; | |
557 | { | |
558 | Address addr; | |
559 | ||
560 | addr = codeloc(f); | |
561 | while (linelookup(addr) == 0 and addr < objsize) { | |
562 | ++addr; | |
563 | } | |
564 | if (addr == objsize) { | |
565 | addr = -1; | |
566 | } | |
567 | return addr; | |
568 | } | |
569 | ||
570 | /* | |
571 | * Catcher drops strike three ... | |
572 | */ | |
573 | ||
574 | public runtofirst() | |
575 | { | |
576 | Address addr; | |
577 | ||
578 | addr = pc; | |
579 | while (linelookup(addr) == 0 and addr < objsize) { | |
580 | ++addr; | |
581 | } | |
582 | if (addr < objsize) { | |
583 | stepto(addr); | |
584 | } | |
585 | } | |
586 | ||
587 | /* | |
588 | * Return the address corresponding to the end of the program. | |
589 | * | |
590 | * We look for the entry to "exit". | |
591 | */ | |
592 | ||
593 | public Address lastaddr() | |
594 | { | |
595 | register Symbol s; | |
596 | ||
597 | s = lookup(identname("exit", true)); | |
598 | if (s == nil) { | |
599 | panic("can't find exit"); | |
600 | } | |
601 | return codeloc(s); | |
602 | } | |
603 | ||
604 | /* | |
605 | * Decide if the given function is currently active. | |
606 | * | |
607 | * We avoid calls to "findframe" during a stack trace for efficiency. | |
608 | * Presumably information evaluated while walking the stack is active. | |
609 | */ | |
610 | ||
611 | public Boolean isactive(f) | |
612 | Symbol f; | |
613 | { | |
614 | register Boolean b; | |
615 | ||
616 | if (isfinished(process)) { | |
617 | b = false; | |
618 | } else { | |
619 | if (walkingstack or f == program or | |
620 | (ismodule(f) and isactive(container(f)))) { | |
621 | b = true; | |
622 | } else { | |
623 | b = (Boolean) (findframe(f) != nil); | |
624 | } | |
625 | } | |
626 | return b; | |
627 | } | |
628 | ||
629 | /* | |
630 | * Evaluate a call to a procedure. | |
631 | */ | |
632 | ||
633 | public callproc(procnode, arglist) | |
634 | Node procnode; | |
635 | Node arglist; | |
636 | { | |
637 | Symbol proc; | |
638 | Integer argc; | |
639 | ||
640 | if (procnode->op != O_SYM) { | |
641 | beginerrmsg(); | |
642 | fprintf(stderr, "can't call \""); | |
643 | prtree(stderr, procnode); | |
644 | fprintf(stderr, "\""); | |
645 | enderrmsg(); | |
646 | } | |
647 | assert(procnode->op == O_SYM); | |
648 | proc = procnode->value.sym; | |
649 | if (not isblock(proc)) { | |
650 | error("\"%s\" is not a procedure or function", symname(proc)); | |
651 | } | |
652 | pushenv(); | |
653 | pc = codeloc(proc); | |
654 | argc = pushargs(proc, arglist); | |
655 | beginproc(proc, argc); | |
656 | isstopped = true; | |
657 | event_once(build(O_EQ, build(O_SYM, pcsym), build(O_SYM, retaddrsym)), | |
658 | buildcmdlist(build(O_PROCRTN, proc))); | |
2fd0f574 | 659 | cont(0); |
52646e6f ML |
660 | /* NOTREACHED */ |
661 | } | |
662 | ||
663 | /* | |
664 | * Push the arguments on the process' stack. We do this by first | |
665 | * evaluating them on the "eval" stack, then copying into the process' | |
666 | * space. | |
667 | */ | |
668 | ||
669 | private Integer pushargs(proc, arglist) | |
670 | Symbol proc; | |
671 | Node arglist; | |
672 | { | |
673 | Stack *savesp; | |
674 | int argc, args_size; | |
675 | ||
676 | savesp = sp; | |
677 | argc = evalargs(proc, arglist); | |
678 | args_size = sp - savesp; | |
679 | setreg(STKP, reg(STKP) - args_size); | |
680 | dwrite(savesp, reg(STKP), args_size); | |
681 | sp = savesp; | |
682 | return argc; | |
683 | } | |
684 | ||
685 | /* | |
2fd0f574 SL |
686 | * Check to see if an expression is correct for a given parameter. |
687 | * If the given parameter is false, don't worry about type inconsistencies. | |
688 | * | |
689 | * Return whether or not it is ok. | |
690 | */ | |
691 | ||
692 | private boolean chkparam (actual, formal, chk) | |
693 | Node actual; | |
694 | Symbol formal; | |
695 | boolean chk; | |
696 | { | |
697 | boolean b; | |
698 | ||
699 | b = true; | |
700 | if (chk) { | |
701 | if (formal == nil) { | |
702 | beginerrmsg(); | |
703 | fprintf(stderr, "too many parameters"); | |
704 | b = false; | |
705 | } else if (not compatible(formal->type, actual->nodetype)) { | |
706 | beginerrmsg(); | |
707 | fprintf(stderr, "type mismatch for %s", symname(formal)); | |
708 | b = false; | |
709 | } | |
710 | } | |
711 | if (b and formal != nil and isvarparam(formal) and | |
712 | not isopenarray(formal->type) and actual->op != O_RVAL) | |
713 | { | |
714 | beginerrmsg(); | |
715 | fprintf(stderr, "expected variable, found \""); | |
716 | prtree(stderr, actual); | |
717 | fprintf(stderr, "\""); | |
718 | b = false; | |
719 | } | |
720 | return b; | |
721 | } | |
722 | ||
723 | /* | |
724 | * Pass an expression to a particular parameter. | |
725 | * | |
726 | * Normally we pass either the address or value, but in some cases | |
727 | * (such as C strings) we want to copy the value onto the stack and | |
728 | * pass its address. | |
729 | */ | |
730 | ||
731 | private passparam (actual, formal) | |
732 | Node actual; | |
733 | Symbol formal; | |
734 | { | |
735 | boolean b; | |
736 | Address addr; | |
737 | Stack *savesp; | |
738 | integer paramsize; | |
739 | ||
740 | if (isvarparam(formal) and not isopenarray(formal->type)) { | |
741 | addr = lval(actual->value.arg[0]); | |
742 | push(Address, addr); | |
743 | } else if (passaddr(formal, actual->nodetype)) { | |
744 | savesp = sp; | |
745 | eval(actual); | |
746 | paramsize = sp - savesp; | |
747 | setreg(STKP, reg(STKP) - paramsize); | |
748 | dwrite(savesp, reg(STKP), paramsize); | |
749 | sp = savesp; | |
750 | push(Address, reg(STKP)); | |
751 | if (formal != nil and isopenarray(formal->type)) { | |
752 | push(integer, paramsize div size(formal->type->type)); | |
753 | } | |
754 | } else { | |
755 | eval(actual); | |
756 | } | |
757 | } | |
758 | ||
759 | /* | |
760 | * Evaluate an argument list left-to-right. | |
52646e6f ML |
761 | */ |
762 | ||
763 | private Integer evalargs(proc, arglist) | |
764 | Symbol proc; | |
765 | Node arglist; | |
766 | { | |
2fd0f574 SL |
767 | Node p, actual; |
768 | Symbol formal; | |
52646e6f | 769 | Stack *savesp; |
52646e6f | 770 | Integer count; |
2fd0f574 | 771 | boolean chk; |
52646e6f ML |
772 | |
773 | savesp = sp; | |
774 | count = 0; | |
2fd0f574 SL |
775 | formal = proc->chain; |
776 | chk = (boolean) (not nosource(proc)); | |
52646e6f | 777 | for (p = arglist; p != nil; p = p->value.arg[1]) { |
2fd0f574 SL |
778 | assert(p->op == O_COMMA); |
779 | actual = p->value.arg[0]; | |
780 | if (not chkparam(actual, formal, chk)) { | |
781 | fprintf(stderr, " in call to %s", symname(proc)); | |
52646e6f | 782 | sp = savesp; |
2fd0f574 | 783 | enderrmsg(); |
52646e6f | 784 | } |
2fd0f574 SL |
785 | passparam(actual, formal); |
786 | if (formal != nil) { | |
787 | formal = formal->chain; | |
52646e6f | 788 | } |
52646e6f ML |
789 | ++count; |
790 | } | |
2fd0f574 SL |
791 | if (chk) { |
792 | if (formal != nil) { | |
793 | sp = savesp; | |
794 | error("not enough parameters to %s", symname(proc)); | |
795 | } | |
52646e6f ML |
796 | } |
797 | return count; | |
798 | } | |
799 | ||
800 | public procreturn(f) | |
801 | Symbol f; | |
802 | { | |
803 | flushoutput(); | |
804 | putchar('\n'); | |
805 | printname(stdout, f); | |
806 | printf(" returns successfully\n", symname(f)); | |
807 | popenv(); | |
808 | erecover(); | |
809 | } | |
810 | ||
811 | /* | |
812 | * Push the current environment. | |
813 | */ | |
814 | ||
815 | private pushenv() | |
816 | { | |
817 | push(Address, pc); | |
818 | push(Lineno, curline); | |
819 | push(String, cursource); | |
820 | push(Boolean, isstopped); | |
821 | push(Symbol, curfunc); | |
2fd0f574 SL |
822 | push(Frame, curframe); |
823 | push(struct Frame, curframerec); | |
52646e6f ML |
824 | push(Word, reg(PROGCTR)); |
825 | push(Word, reg(STKP)); | |
826 | } | |
827 | ||
828 | /* | |
829 | * Pop back to the real world. | |
830 | */ | |
831 | ||
832 | public popenv() | |
833 | { | |
834 | register String filename; | |
835 | ||
836 | setreg(STKP, pop(Word)); | |
837 | setreg(PROGCTR, pop(Word)); | |
2fd0f574 SL |
838 | curframerec = pop(struct Frame); |
839 | curframe = pop(Frame); | |
52646e6f ML |
840 | curfunc = pop(Symbol); |
841 | isstopped = pop(Boolean); | |
842 | filename = pop(String); | |
843 | curline = pop(Lineno); | |
844 | pc = pop(Address); | |
845 | setsource(filename); | |
846 | } | |
847 | ||
848 | /* | |
849 | * Flush the debuggee's standard output. | |
850 | * | |
851 | * This is VERY dependent on the use of stdio. | |
852 | */ | |
853 | ||
854 | public flushoutput() | |
855 | { | |
856 | register Symbol p, iob; | |
857 | register Stack *savesp; | |
858 | ||
859 | p = lookup(identname("fflush", true)); | |
860 | while (p != nil and not isblock(p)) { | |
861 | p = p->next_sym; | |
862 | } | |
863 | if (p != nil) { | |
864 | iob = lookup(identname("_iob", true)); | |
865 | if (iob != nil) { | |
866 | pushenv(); | |
867 | pc = codeloc(p); | |
868 | savesp = sp; | |
869 | push(long, address(iob, nil) + sizeof(struct _iobuf)); | |
870 | setreg(STKP, reg(STKP) - sizeof(long)); | |
871 | dwrite(savesp, reg(STKP), sizeof(long)); | |
872 | sp = savesp; | |
873 | beginproc(p, 1); | |
874 | stepto(return_addr()); | |
875 | popenv(); | |
876 | } | |
877 | } | |
878 | } |