Annotation of OpenXM_contrib/gc/dbg_mlc.c, Revision 1.1.1.2
1.1 maekawa 1: /*
2: * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
3: * Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
4: * Copyright (c) 1997 by Silicon Graphics. All rights reserved.
5: *
6: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
7: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
8: *
9: * Permission is hereby granted to use or copy this program
10: * for any purpose, provided the above notices are retained on all copies.
11: * Permission to modify the code and to distribute modified code is granted,
12: * provided the above notices are retained, and a notice that the code was
13: * modified is included with the above copyright notice.
14: */
1.1.1.2 ! maekawa 15: # define I_HIDE_POINTERS
1.1 maekawa 16: # include "gc_priv.h"
1.1.1.2 ! maekawa 17: # ifdef KEEP_BACK_PTRS
! 18: # include "backptr.h"
! 19: # endif
1.1 maekawa 20:
21: void GC_default_print_heap_obj_proc();
22: GC_API void GC_register_finalizer_no_order
23: GC_PROTO((GC_PTR obj, GC_finalization_proc fn, GC_PTR cd,
24: GC_finalization_proc *ofn, GC_PTR *ocd));
25:
26: /* Do we want to and know how to save the call stack at the time of */
27: /* an allocation? How much space do we want to use in each object? */
28:
29: # define START_FLAG ((word)0xfedcedcb)
30: # define END_FLAG ((word)0xbcdecdef)
31: /* Stored both one past the end of user object, and one before */
32: /* the end of the object as seen by the allocator. */
33:
34:
35: /* Object header */
36: typedef struct {
1.1.1.2 ! maekawa 37: # ifdef KEEP_BACK_PTRS
! 38: ptr_t oh_back_ptr;
! 39: # define MARKED_FOR_FINALIZATION (ptr_t)(-1)
! 40: /* Object was marked because it is finalizable. */
! 41: # ifdef ALIGN_DOUBLE
! 42: word oh_dummy;
! 43: # endif
! 44: # endif
1.1 maekawa 45: char * oh_string; /* object descriptor string */
46: word oh_int; /* object descriptor integers */
47: # ifdef NEED_CALLINFO
48: struct callinfo oh_ci[NFRAMES];
49: # endif
50: word oh_sz; /* Original malloc arg. */
51: word oh_sf; /* start flag */
52: } oh;
53: /* The size of the above structure is assumed not to dealign things, */
54: /* and to be a multiple of the word length. */
55:
56: #define DEBUG_BYTES (sizeof (oh) + sizeof (word))
57: #undef ROUNDED_UP_WORDS
58: #define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1) - 1)
59:
60:
61: #ifdef SAVE_CALL_CHAIN
62: # define ADD_CALL_CHAIN(base, ra) GC_save_callers(((oh *)(base)) -> oh_ci)
63: # define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci)
64: #else
65: # ifdef GC_ADD_CALLER
66: # define ADD_CALL_CHAIN(base, ra) ((oh *)(base)) -> oh_ci[0].ci_pc = (ra)
67: # define PRINT_CALL_CHAIN(base) GC_print_callers(((oh *)(base)) -> oh_ci)
68: # else
69: # define ADD_CALL_CHAIN(base, ra)
70: # define PRINT_CALL_CHAIN(base)
71: # endif
72: #endif
73:
74: /* Check whether object with base pointer p has debugging info */
75: /* p is assumed to point to a legitimate object in our part */
76: /* of the heap. */
77: GC_bool GC_has_debug_info(p)
78: ptr_t p;
79: {
80: register oh * ohdr = (oh *)p;
81: register ptr_t body = (ptr_t)(ohdr + 1);
82: register word sz = GC_size((ptr_t) ohdr);
83:
84: if (HBLKPTR((ptr_t)ohdr) != HBLKPTR((ptr_t)body)
85: || sz < sizeof (oh)) {
86: return(FALSE);
87: }
88: if (ohdr -> oh_sz == sz) {
89: /* Object may have had debug info, but has been deallocated */
90: return(FALSE);
91: }
92: if (ohdr -> oh_sf == (START_FLAG ^ (word)body)) return(TRUE);
93: if (((word *)ohdr)[BYTES_TO_WORDS(sz)-1] == (END_FLAG ^ (word)body)) {
94: return(TRUE);
95: }
96: return(FALSE);
97: }
98:
1.1.1.2 ! maekawa 99: #ifdef KEEP_BACK_PTRS
! 100: /* Store back pointer to source in dest, if that appears to be possible. */
! 101: /* This is not completely safe, since we may mistakenly conclude that */
! 102: /* dest has a debugging wrapper. But the error probability is very */
! 103: /* small, and this shouldn't be used in production code. */
! 104: /* We assume that dest is the real base pointer. Source will usually */
! 105: /* be a pointer to the interior of an object. */
! 106: void GC_store_back_pointer(ptr_t source, ptr_t dest)
! 107: {
! 108: if (GC_has_debug_info(dest)) {
! 109: ((oh *)dest) -> oh_back_ptr = (ptr_t)HIDE_POINTER(source);
! 110: }
! 111: }
! 112:
! 113: void GC_marked_for_finalization(ptr_t dest) {
! 114: GC_store_back_pointer(MARKED_FOR_FINALIZATION, dest);
! 115: }
! 116:
! 117: /* Store information about the object referencing dest in *base_p */
! 118: /* and *offset_p. */
! 119: /* source is root ==> *base_p = 0, *offset_p = address */
! 120: /* source is heap object ==> *base_p != 0, *offset_p = offset */
! 121: /* Returns 1 on success, 0 if source couldn't be determined. */
! 122: /* Dest can be any address within a heap object. */
! 123: GC_ref_kind GC_get_back_ptr_info(void *dest, void **base_p, size_t *offset_p)
! 124: {
! 125: oh * hdr = (oh *)GC_base(dest);
! 126: ptr_t bp;
! 127: ptr_t bp_base;
! 128: if (!GC_has_debug_info((ptr_t) hdr)) return GC_NO_SPACE;
! 129: bp = hdr -> oh_back_ptr;
! 130: if (MARKED_FOR_FINALIZATION == bp) return GC_FINALIZER_REFD;
! 131: if (0 == bp) return GC_UNREFERENCED;
! 132: bp = REVEAL_POINTER(bp);
! 133: bp_base = GC_base(bp);
! 134: if (0 == bp_base) {
! 135: *base_p = bp;
! 136: *offset_p = 0;
! 137: return GC_REFD_FROM_ROOT;
! 138: } else {
! 139: if (GC_has_debug_info(bp_base)) bp_base += sizeof(oh);
! 140: *base_p = bp_base;
! 141: *offset_p = bp - bp_base;
! 142: return GC_REFD_FROM_HEAP;
! 143: }
! 144: }
! 145:
! 146: /* Generate a random heap address. */
! 147: /* The resulting address is in the heap, but */
! 148: /* not necessarily inside a valid object. */
! 149: void *GC_generate_random_heap_address(void)
! 150: {
! 151: int i;
! 152: int heap_offset = random() % GC_heapsize;
! 153: for (i = 0; i < GC_n_heap_sects; ++ i) {
! 154: int size = GC_heap_sects[i].hs_bytes;
! 155: if (heap_offset < size) {
! 156: return GC_heap_sects[i].hs_start + heap_offset;
! 157: } else {
! 158: heap_offset -= size;
! 159: }
! 160: }
! 161: ABORT("GC_generate_random_heap_address: size inconsistency");
! 162: /*NOTREACHED*/
! 163: return 0;
! 164: }
! 165:
! 166: /* Generate a random address inside a valid marked heap object. */
! 167: void *GC_generate_random_valid_address(void)
! 168: {
! 169: ptr_t result;
! 170: ptr_t base;
! 171: for (;;) {
! 172: result = GC_generate_random_heap_address();
! 173: base = GC_base(result);
! 174: if (0 == base) continue;
! 175: if (!GC_is_marked(base)) continue;
! 176: return result;
! 177: }
! 178: }
! 179:
! 180: /* Force a garbage collection and generate a backtrace from a */
! 181: /* random heap address. */
! 182: void GC_generate_random_backtrace(void)
! 183: {
! 184: void * current;
! 185: int i;
! 186: void * base;
! 187: size_t offset;
! 188: GC_ref_kind source;
! 189: GC_gcollect();
! 190: current = GC_generate_random_valid_address();
! 191: GC_printf1("Chose address 0x%lx in object\n", (unsigned long)current);
! 192: GC_print_heap_obj(GC_base(current));
! 193: GC_err_printf0("\n");
! 194: for (i = 0; ; ++i) {
! 195: source = GC_get_back_ptr_info(current, &base, &offset);
! 196: if (GC_UNREFERENCED == source) {
! 197: GC_err_printf0("Reference could not be found\n");
! 198: goto out;
! 199: }
! 200: if (GC_NO_SPACE == source) {
! 201: GC_err_printf0("No debug info in object: Can't find reference\n");
! 202: goto out;
! 203: }
! 204: GC_err_printf1("Reachable via %d levels of pointers from ",
! 205: (unsigned long)i);
! 206: switch(source) {
! 207: case GC_REFD_FROM_ROOT:
! 208: GC_err_printf1("root at 0x%lx\n", (unsigned long)base);
! 209: goto out;
! 210: case GC_FINALIZER_REFD:
! 211: GC_err_printf0("list of finalizable objects\n");
! 212: goto out;
! 213: case GC_REFD_FROM_HEAP:
! 214: GC_err_printf1("offset %ld in object:\n", (unsigned long)offset);
! 215: /* Take GC_base(base) to get real base, i.e. header. */
! 216: GC_print_heap_obj(GC_base(base));
! 217: GC_err_printf0("\n");
! 218: break;
! 219: }
! 220: current = base;
! 221: }
! 222: out:;
! 223: }
! 224:
! 225: #endif /* KEEP_BACK_PTRS */
! 226:
1.1 maekawa 227: /* Store debugging info into p. Return displaced pointer. */
228: /* Assumes we don't hold allocation lock. */
229: ptr_t GC_store_debug_info(p, sz, string, integer)
230: register ptr_t p; /* base pointer */
231: word sz; /* bytes */
232: char * string;
233: word integer;
234: {
235: register word * result = (word *)((oh *)p + 1);
236: DCL_LOCK_STATE;
237:
238: /* There is some argument that we should dissble signals here. */
239: /* But that's expensive. And this way things should only appear */
240: /* inconsistent while we're in the handler. */
241: LOCK();
1.1.1.2 ! maekawa 242: # ifdef KEEP_BACK_PTRS
! 243: ((oh *)p) -> oh_back_ptr = 0;
! 244: # endif
1.1 maekawa 245: ((oh *)p) -> oh_string = string;
246: ((oh *)p) -> oh_int = integer;
247: ((oh *)p) -> oh_sz = sz;
248: ((oh *)p) -> oh_sf = START_FLAG ^ (word)result;
249: ((word *)p)[BYTES_TO_WORDS(GC_size(p))-1] =
250: result[ROUNDED_UP_WORDS(sz)] = END_FLAG ^ (word)result;
251: UNLOCK();
252: return((ptr_t)result);
253: }
254:
1.1.1.2 ! maekawa 255: /* Check the object with debugging info at ohdr */
1.1 maekawa 256: /* return NIL if it's OK. Else return clobbered */
257: /* address. */
258: ptr_t GC_check_annotated_obj(ohdr)
259: register oh * ohdr;
260: {
261: register ptr_t body = (ptr_t)(ohdr + 1);
262: register word gc_sz = GC_size((ptr_t)ohdr);
263: if (ohdr -> oh_sz + DEBUG_BYTES > gc_sz) {
264: return((ptr_t)(&(ohdr -> oh_sz)));
265: }
266: if (ohdr -> oh_sf != (START_FLAG ^ (word)body)) {
267: return((ptr_t)(&(ohdr -> oh_sf)));
268: }
269: if (((word *)ohdr)[BYTES_TO_WORDS(gc_sz)-1] != (END_FLAG ^ (word)body)) {
270: return((ptr_t)((word *)ohdr + BYTES_TO_WORDS(gc_sz)-1));
271: }
272: if (((word *)body)[ROUNDED_UP_WORDS(ohdr -> oh_sz)]
273: != (END_FLAG ^ (word)body)) {
274: return((ptr_t)((word *)body + ROUNDED_UP_WORDS(ohdr -> oh_sz)));
275: }
276: return(0);
277: }
278:
279: void GC_print_obj(p)
280: ptr_t p;
281: {
282: register oh * ohdr = (oh *)GC_base(p);
283:
284: GC_err_printf1("0x%lx (", ((unsigned long)ohdr + sizeof(oh)));
285: GC_err_puts(ohdr -> oh_string);
286: GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
287: (unsigned long)(ohdr -> oh_sz));
288: PRINT_CALL_CHAIN(ohdr);
289: }
290:
291: void GC_debug_print_heap_obj_proc(p)
292: ptr_t p;
293: {
294: if (GC_has_debug_info(p)) {
295: GC_print_obj(p);
296: } else {
297: GC_default_print_heap_obj_proc(p);
298: }
299: }
300:
301: void GC_print_smashed_obj(p, clobbered_addr)
302: ptr_t p, clobbered_addr;
303: {
304: register oh * ohdr = (oh *)GC_base(p);
305:
306: GC_err_printf2("0x%lx in object at 0x%lx(", (unsigned long)clobbered_addr,
307: (unsigned long)p);
308: if (clobbered_addr <= (ptr_t)(&(ohdr -> oh_sz))
309: || ohdr -> oh_string == 0) {
310: GC_err_printf1("<smashed>, appr. sz = %ld)\n",
311: (GC_size((ptr_t)ohdr) - DEBUG_BYTES));
312: } else {
313: if (ohdr -> oh_string[0] == '\0') {
314: GC_err_puts("EMPTY(smashed?)");
315: } else {
316: GC_err_puts(ohdr -> oh_string);
317: }
318: GC_err_printf2(":%ld, sz=%ld)\n", (unsigned long)(ohdr -> oh_int),
319: (unsigned long)(ohdr -> oh_sz));
320: PRINT_CALL_CHAIN(ohdr);
321: }
322: }
323:
324: void GC_check_heap_proc();
325:
326: void GC_start_debugging()
327: {
328: GC_check_heap = GC_check_heap_proc;
329: GC_print_heap_obj = GC_debug_print_heap_obj_proc;
330: GC_debugging_started = TRUE;
331: GC_register_displacement((word)sizeof(oh));
332: }
333:
334: # if defined(__STDC__) || defined(__cplusplus)
335: void GC_debug_register_displacement(GC_word offset)
336: # else
337: void GC_debug_register_displacement(offset)
338: GC_word offset;
339: # endif
340: {
341: GC_register_displacement(offset);
342: GC_register_displacement((word)sizeof(oh) + offset);
343: }
344:
345: # ifdef GC_ADD_CALLER
1.1.1.2 ! maekawa 346: # define EXTRA_ARGS word ra, CONST char * s, int i
1.1 maekawa 347: # define OPT_RA ra,
348: # else
1.1.1.2 ! maekawa 349: # define EXTRA_ARGS CONST char * s, int i
1.1 maekawa 350: # define OPT_RA
351: # endif
352:
353: # ifdef __STDC__
354: GC_PTR GC_debug_malloc(size_t lb, EXTRA_ARGS)
355: # else
356: GC_PTR GC_debug_malloc(lb, s, i)
357: size_t lb;
358: char * s;
359: int i;
360: # ifdef GC_ADD_CALLER
361: --> GC_ADD_CALLER not implemented for K&R C
362: # endif
363: # endif
364: {
365: GC_PTR result = GC_malloc(lb + DEBUG_BYTES);
366:
367: if (result == 0) {
368: GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
369: (unsigned long) lb);
370: GC_err_puts(s);
371: GC_err_printf1(":%ld)\n", (unsigned long)i);
372: return(0);
373: }
374: if (!GC_debugging_started) {
375: GC_start_debugging();
376: }
377: ADD_CALL_CHAIN(result, ra);
378: return (GC_store_debug_info(result, (word)lb, s, (word)i));
379: }
380:
381: #ifdef STUBBORN_ALLOC
382: # ifdef __STDC__
383: GC_PTR GC_debug_malloc_stubborn(size_t lb, EXTRA_ARGS)
384: # else
385: GC_PTR GC_debug_malloc_stubborn(lb, s, i)
386: size_t lb;
387: char * s;
388: int i;
389: # endif
390: {
391: GC_PTR result = GC_malloc_stubborn(lb + DEBUG_BYTES);
392:
393: if (result == 0) {
394: GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
395: (unsigned long) lb);
396: GC_err_puts(s);
397: GC_err_printf1(":%ld)\n", (unsigned long)i);
398: return(0);
399: }
400: if (!GC_debugging_started) {
401: GC_start_debugging();
402: }
403: ADD_CALL_CHAIN(result, ra);
404: return (GC_store_debug_info(result, (word)lb, s, (word)i));
405: }
406:
407: void GC_debug_change_stubborn(p)
408: GC_PTR p;
409: {
410: register GC_PTR q = GC_base(p);
411: register hdr * hhdr;
412:
413: if (q == 0) {
414: GC_err_printf1("Bad argument: 0x%lx to GC_debug_change_stubborn\n",
415: (unsigned long) p);
416: ABORT("GC_debug_change_stubborn: bad arg");
417: }
418: hhdr = HDR(q);
419: if (hhdr -> hb_obj_kind != STUBBORN) {
420: GC_err_printf1("GC_debug_change_stubborn arg not stubborn: 0x%lx\n",
421: (unsigned long) p);
422: ABORT("GC_debug_change_stubborn: arg not stubborn");
423: }
424: GC_change_stubborn(q);
425: }
426:
427: void GC_debug_end_stubborn_change(p)
428: GC_PTR p;
429: {
430: register GC_PTR q = GC_base(p);
431: register hdr * hhdr;
432:
433: if (q == 0) {
434: GC_err_printf1("Bad argument: 0x%lx to GC_debug_end_stubborn_change\n",
435: (unsigned long) p);
436: ABORT("GC_debug_end_stubborn_change: bad arg");
437: }
438: hhdr = HDR(q);
439: if (hhdr -> hb_obj_kind != STUBBORN) {
440: GC_err_printf1("debug_end_stubborn_change arg not stubborn: 0x%lx\n",
441: (unsigned long) p);
442: ABORT("GC_debug_end_stubborn_change: arg not stubborn");
443: }
444: GC_end_stubborn_change(q);
445: }
446:
447: #endif /* STUBBORN_ALLOC */
448:
449: # ifdef __STDC__
450: GC_PTR GC_debug_malloc_atomic(size_t lb, EXTRA_ARGS)
451: # else
452: GC_PTR GC_debug_malloc_atomic(lb, s, i)
453: size_t lb;
454: char * s;
455: int i;
456: # endif
457: {
458: GC_PTR result = GC_malloc_atomic(lb + DEBUG_BYTES);
459:
460: if (result == 0) {
461: GC_err_printf1("GC_debug_malloc_atomic(%ld) returning NIL (",
462: (unsigned long) lb);
463: GC_err_puts(s);
464: GC_err_printf1(":%ld)\n", (unsigned long)i);
465: return(0);
466: }
467: if (!GC_debugging_started) {
468: GC_start_debugging();
469: }
470: ADD_CALL_CHAIN(result, ra);
471: return (GC_store_debug_info(result, (word)lb, s, (word)i));
472: }
473:
474: # ifdef __STDC__
475: GC_PTR GC_debug_malloc_uncollectable(size_t lb, EXTRA_ARGS)
476: # else
477: GC_PTR GC_debug_malloc_uncollectable(lb, s, i)
478: size_t lb;
479: char * s;
480: int i;
481: # endif
482: {
483: GC_PTR result = GC_malloc_uncollectable(lb + DEBUG_BYTES);
484:
485: if (result == 0) {
486: GC_err_printf1("GC_debug_malloc_uncollectable(%ld) returning NIL (",
487: (unsigned long) lb);
488: GC_err_puts(s);
489: GC_err_printf1(":%ld)\n", (unsigned long)i);
490: return(0);
491: }
492: if (!GC_debugging_started) {
493: GC_start_debugging();
494: }
495: ADD_CALL_CHAIN(result, ra);
496: return (GC_store_debug_info(result, (word)lb, s, (word)i));
497: }
498:
499: #ifdef ATOMIC_UNCOLLECTABLE
500: # ifdef __STDC__
501: GC_PTR GC_debug_malloc_atomic_uncollectable(size_t lb, EXTRA_ARGS)
502: # else
503: GC_PTR GC_debug_malloc_atomic_uncollectable(lb, s, i)
504: size_t lb;
505: char * s;
506: int i;
507: # endif
508: {
509: GC_PTR result = GC_malloc_atomic_uncollectable(lb + DEBUG_BYTES);
510:
511: if (result == 0) {
512: GC_err_printf1(
513: "GC_debug_malloc_atomic_uncollectable(%ld) returning NIL (",
514: (unsigned long) lb);
515: GC_err_puts(s);
516: GC_err_printf1(":%ld)\n", (unsigned long)i);
517: return(0);
518: }
519: if (!GC_debugging_started) {
520: GC_start_debugging();
521: }
522: ADD_CALL_CHAIN(result, ra);
523: return (GC_store_debug_info(result, (word)lb, s, (word)i));
524: }
525: #endif /* ATOMIC_UNCOLLECTABLE */
526:
527: # ifdef __STDC__
528: void GC_debug_free(GC_PTR p)
529: # else
530: void GC_debug_free(p)
531: GC_PTR p;
532: # endif
533: {
1.1.1.2 ! maekawa 534: register GC_PTR base;
1.1 maekawa 535: register ptr_t clobbered;
536:
1.1.1.2 ! maekawa 537: if (0 == p) return;
! 538: base = GC_base(p);
1.1 maekawa 539: if (base == 0) {
540: GC_err_printf1("Attempt to free invalid pointer %lx\n",
541: (unsigned long)p);
1.1.1.2 ! maekawa 542: ABORT("free(invalid pointer)");
1.1 maekawa 543: }
544: if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
545: GC_err_printf1(
546: "GC_debug_free called on pointer %lx wo debugging info\n",
547: (unsigned long)p);
548: } else {
549: clobbered = GC_check_annotated_obj((oh *)base);
550: if (clobbered != 0) {
551: if (((oh *)base) -> oh_sz == GC_size(base)) {
552: GC_err_printf0(
553: "GC_debug_free: found previously deallocated (?) object at ");
554: } else {
1.1.1.2 ! maekawa 555: GC_err_printf0("GC_debug_free: found smashed location at ");
1.1 maekawa 556: }
557: GC_print_smashed_obj(p, clobbered);
558: }
559: /* Invalidate size */
560: ((oh *)base) -> oh_sz = GC_size(base);
561: }
1.1.1.2 ! maekawa 562: if (GC_find_leak) {
1.1 maekawa 563: GC_free(base);
1.1.1.2 ! maekawa 564: } else {
! 565: register hdr * hhdr = HDR(p);
! 566: GC_bool uncollectable = FALSE;
1.1 maekawa 567:
1.1.1.2 ! maekawa 568: if (hhdr -> hb_obj_kind == UNCOLLECTABLE) {
! 569: uncollectable = TRUE;
1.1 maekawa 570: }
1.1.1.2 ! maekawa 571: # ifdef ATOMIC_UNCOLLECTABLE
! 572: if (hhdr -> hb_obj_kind == AUNCOLLECTABLE) {
! 573: uncollectable = TRUE;
! 574: }
! 575: # endif
! 576: if (uncollectable) GC_free(base);
! 577: } /* !GC_find_leak */
1.1 maekawa 578: }
579:
580: # ifdef __STDC__
581: GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, EXTRA_ARGS)
582: # else
583: GC_PTR GC_debug_realloc(p, lb, s, i)
584: GC_PTR p;
585: size_t lb;
586: char *s;
587: int i;
588: # endif
589: {
590: register GC_PTR base = GC_base(p);
591: register ptr_t clobbered;
592: register GC_PTR result;
593: register size_t copy_sz = lb;
594: register size_t old_sz;
595: register hdr * hhdr;
596:
597: if (p == 0) return(GC_debug_malloc(lb, OPT_RA s, i));
598: if (base == 0) {
599: GC_err_printf1(
600: "Attempt to reallocate invalid pointer %lx\n", (unsigned long)p);
601: ABORT("realloc(invalid pointer)");
602: }
603: if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
604: GC_err_printf1(
605: "GC_debug_realloc called on pointer %lx wo debugging info\n",
606: (unsigned long)p);
607: return(GC_realloc(p, lb));
608: }
609: hhdr = HDR(base);
610: switch (hhdr -> hb_obj_kind) {
611: # ifdef STUBBORN_ALLOC
612: case STUBBORN:
613: result = GC_debug_malloc_stubborn(lb, OPT_RA s, i);
614: break;
615: # endif
616: case NORMAL:
617: result = GC_debug_malloc(lb, OPT_RA s, i);
618: break;
619: case PTRFREE:
620: result = GC_debug_malloc_atomic(lb, OPT_RA s, i);
621: break;
622: case UNCOLLECTABLE:
623: result = GC_debug_malloc_uncollectable(lb, OPT_RA s, i);
624: break;
625: # ifdef ATOMIC_UNCOLLECTABLE
626: case AUNCOLLECTABLE:
627: result = GC_debug_malloc_atomic_uncollectable(lb, OPT_RA s, i);
628: break;
629: # endif
630: default:
631: GC_err_printf0("GC_debug_realloc: encountered bad kind\n");
632: ABORT("bad kind");
633: }
634: clobbered = GC_check_annotated_obj((oh *)base);
635: if (clobbered != 0) {
1.1.1.2 ! maekawa 636: GC_err_printf0("GC_debug_realloc: found smashed location at ");
1.1 maekawa 637: GC_print_smashed_obj(p, clobbered);
638: }
639: old_sz = ((oh *)base) -> oh_sz;
640: if (old_sz < copy_sz) copy_sz = old_sz;
641: if (result == 0) return(0);
642: BCOPY(p, result, copy_sz);
643: GC_debug_free(p);
644: return(result);
645: }
646:
647: /* Check all marked objects in the given block for validity */
648: /*ARGSUSED*/
649: void GC_check_heap_block(hbp, dummy)
650: register struct hblk *hbp; /* ptr to current heap block */
651: word dummy;
652: {
653: register struct hblkhdr * hhdr = HDR(hbp);
654: register word sz = hhdr -> hb_sz;
655: register int word_no;
656: register word *p, *plim;
657:
658: p = (word *)(hbp->hb_body);
659: word_no = HDR_WORDS;
660: if (sz > MAXOBJSZ) {
661: plim = p;
662: } else {
663: plim = (word *)((((word)hbp) + HBLKSIZE) - WORDS_TO_BYTES(sz));
664: }
665: /* go through all words in block */
666: while( p <= plim ) {
667: if( mark_bit_from_hdr(hhdr, word_no)
668: && GC_has_debug_info((ptr_t)p)) {
669: ptr_t clobbered = GC_check_annotated_obj((oh *)p);
670:
671: if (clobbered != 0) {
672: GC_err_printf0(
1.1.1.2 ! maekawa 673: "GC_check_heap_block: found smashed location at ");
1.1 maekawa 674: GC_print_smashed_obj((ptr_t)p, clobbered);
675: }
676: }
677: word_no += sz;
678: p += sz;
679: }
680: }
681:
682:
683: /* This assumes that all accessible objects are marked, and that */
684: /* I hold the allocation lock. Normally called by collector. */
685: void GC_check_heap_proc()
686: {
687: # ifndef SMALL_CONFIG
688: if (sizeof(oh) & (2 * sizeof(word) - 1) != 0) {
689: ABORT("Alignment problem: object header has inappropriate size\n");
690: }
691: # endif
692: GC_apply_to_all_blocks(GC_check_heap_block, (word)0);
693: }
694:
695: struct closure {
696: GC_finalization_proc cl_fn;
697: GC_PTR cl_data;
698: };
699:
700: # ifdef __STDC__
701: void * GC_make_closure(GC_finalization_proc fn, void * data)
702: # else
703: GC_PTR GC_make_closure(fn, data)
704: GC_finalization_proc fn;
705: GC_PTR data;
706: # endif
707: {
708: struct closure * result =
709: (struct closure *) GC_malloc(sizeof (struct closure));
710:
711: result -> cl_fn = fn;
712: result -> cl_data = data;
713: return((GC_PTR)result);
714: }
715:
716: # ifdef __STDC__
717: void GC_debug_invoke_finalizer(void * obj, void * data)
718: # else
719: void GC_debug_invoke_finalizer(obj, data)
720: char * obj;
721: char * data;
722: # endif
723: {
724: register struct closure * cl = (struct closure *) data;
725:
726: (*(cl -> cl_fn))((GC_PTR)((char *)obj + sizeof(oh)), cl -> cl_data);
727: }
728:
729:
730: # ifdef __STDC__
731: void GC_debug_register_finalizer(GC_PTR obj, GC_finalization_proc fn,
732: GC_PTR cd, GC_finalization_proc *ofn,
733: GC_PTR *ocd)
734: # else
735: void GC_debug_register_finalizer(obj, fn, cd, ofn, ocd)
736: GC_PTR obj;
737: GC_finalization_proc fn;
738: GC_PTR cd;
739: GC_finalization_proc *ofn;
740: GC_PTR *ocd;
741: # endif
742: {
743: ptr_t base = GC_base(obj);
744: if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
745: GC_err_printf1(
746: "GC_register_finalizer called with non-base-pointer 0x%lx\n",
747: obj);
748: }
749: GC_register_finalizer(base, GC_debug_invoke_finalizer,
750: GC_make_closure(fn,cd), ofn, ocd);
751: }
752:
753: # ifdef __STDC__
754: void GC_debug_register_finalizer_no_order
755: (GC_PTR obj, GC_finalization_proc fn,
756: GC_PTR cd, GC_finalization_proc *ofn,
757: GC_PTR *ocd)
758: # else
759: void GC_debug_register_finalizer_no_order
760: (obj, fn, cd, ofn, ocd)
761: GC_PTR obj;
762: GC_finalization_proc fn;
763: GC_PTR cd;
764: GC_finalization_proc *ofn;
765: GC_PTR *ocd;
766: # endif
767: {
768: ptr_t base = GC_base(obj);
769: if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
770: GC_err_printf1(
771: "GC_register_finalizer_no_order called with non-base-pointer 0x%lx\n",
772: obj);
773: }
774: GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
775: GC_make_closure(fn,cd), ofn, ocd);
776: }
777:
778: # ifdef __STDC__
779: void GC_debug_register_finalizer_ignore_self
780: (GC_PTR obj, GC_finalization_proc fn,
781: GC_PTR cd, GC_finalization_proc *ofn,
782: GC_PTR *ocd)
783: # else
784: void GC_debug_register_finalizer_ignore_self
785: (obj, fn, cd, ofn, ocd)
786: GC_PTR obj;
787: GC_finalization_proc fn;
788: GC_PTR cd;
789: GC_finalization_proc *ofn;
790: GC_PTR *ocd;
791: # endif
792: {
793: ptr_t base = GC_base(obj);
794: if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
795: GC_err_printf1(
796: "GC_register_finalizer_ignore_self called with non-base-pointer 0x%lx\n",
797: obj);
798: }
799: GC_register_finalizer_ignore_self(base, GC_debug_invoke_finalizer,
800: GC_make_closure(fn,cd), ofn, ocd);
801: }
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