boehm-gc/dbg_mlc.c

   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  */
  15 # define I_HIDE_POINTERS
  16 # include "gc_priv.h"
  17 # ifdef KEEP_BACK_PTRS
  18 #   include "backptr.h"
  19 # endif
  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 {
  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
  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
  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
 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();
 242 #   ifdef KEEP_BACK_PTRS
 243       ((oh *)p) -> oh_back_ptr = 0;
 244 #   endif
 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
 255 /* Check the object with debugging info at ohdr         */
 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
 346 #   define EXTRA_ARGS word ra, CONST char * s, int i
 347 #   define OPT_RA ra,
 348 # else
 349 #   define EXTRA_ARGS CONST char * s, int i
 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 __STDC__
 382     GC_PTR GC_debug_generic_malloc(size_t lb, int k, EXTRA_ARGS)
 383 # else
 384     GC_PTR GC_debug_malloc(lb, k, s, i)
 385     size_t lb;
 386     int k;
 387     char * s;
 388     int i;
 389 #   ifdef GC_ADD_CALLER
 390         --> GC_ADD_CALLER not implemented for K&R C
 391 #   endif
 392 # endif
 393 {
 394     GC_PTR result = GC_generic_malloc(lb + DEBUG_BYTES, k);
 395
 396     if (result == 0) {
 397         GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
 398                        (unsigned long) lb);
 399         GC_err_puts(s);
 400         GC_err_printf1(":%ld)\n", (unsigned long)i);
 401         return(0);
 402     }
 403     if (!GC_debugging_started) {
 404         GC_start_debugging();
 405     }
 406     ADD_CALL_CHAIN(result, ra);
 407     return (GC_store_debug_info(result, (word)lb, s, (word)i));
 408 }
 409
 410 #ifdef STUBBORN_ALLOC
 411 # ifdef __STDC__
 412     GC_PTR GC_debug_malloc_stubborn(size_t lb, EXTRA_ARGS)
 413 # else
 414     GC_PTR GC_debug_malloc_stubborn(lb, s, i)
 415     size_t lb;
 416     char * s;
 417     int i;
 418 # endif
 419 {
 420     GC_PTR result = GC_malloc_stubborn(lb + DEBUG_BYTES);
 421
 422     if (result == 0) {
 423         GC_err_printf1("GC_debug_malloc(%ld) returning NIL (",
 424                        (unsigned long) lb);
 425         GC_err_puts(s);
 426         GC_err_printf1(":%ld)\n", (unsigned long)i);
 427         return(0);
 428     }
 429     if (!GC_debugging_started) {
 430         GC_start_debugging();
 431     }
 432     ADD_CALL_CHAIN(result, ra);
 433     return (GC_store_debug_info(result, (word)lb, s, (word)i));
 434 }
 435
 436 void GC_debug_change_stubborn(p)
 437 GC_PTR p;
 438 {
 439     register GC_PTR q = GC_base(p);
 440     register hdr * hhdr;
 441
 442     if (q == 0) {
 443         GC_err_printf1("Bad argument: 0x%lx to GC_debug_change_stubborn\n",
 444                        (unsigned long) p);
 445         ABORT("GC_debug_change_stubborn: bad arg");
 446     }
 447     hhdr = HDR(q);
 448     if (hhdr -> hb_obj_kind != STUBBORN) {
 449         GC_err_printf1("GC_debug_change_stubborn arg not stubborn: 0x%lx\n",
 450                        (unsigned long) p);
 451         ABORT("GC_debug_change_stubborn: arg not stubborn");
 452     }
 453     GC_change_stubborn(q);
 454 }
 455
 456 void GC_debug_end_stubborn_change(p)
 457 GC_PTR p;
 458 {
 459     register GC_PTR q = GC_base(p);
 460     register hdr * hhdr;
 461
 462     if (q == 0) {
 463         GC_err_printf1("Bad argument: 0x%lx to GC_debug_end_stubborn_change\n",
 464                        (unsigned long) p);
 465         ABORT("GC_debug_end_stubborn_change: bad arg");
 466     }
 467     hhdr = HDR(q);
 468     if (hhdr -> hb_obj_kind != STUBBORN) {
 469         GC_err_printf1("debug_end_stubborn_change arg not stubborn: 0x%lx\n",
 470                        (unsigned long) p);
 471         ABORT("GC_debug_end_stubborn_change: arg not stubborn");
 472     }
 473     GC_end_stubborn_change(q);
 474 }
 475
 476 #endif /* STUBBORN_ALLOC */
 477
 478 # ifdef __STDC__
 479     GC_PTR GC_debug_malloc_atomic(size_t lb, EXTRA_ARGS)
 480 # else
 481     GC_PTR GC_debug_malloc_atomic(lb, s, i)
 482     size_t lb;
 483     char * s;
 484     int i;
 485 # endif
 486 {
 487     GC_PTR result = GC_malloc_atomic(lb + DEBUG_BYTES);
 488
 489     if (result == 0) {
 490         GC_err_printf1("GC_debug_malloc_atomic(%ld) returning NIL (",
 491                       (unsigned long) lb);
 492         GC_err_puts(s);
 493         GC_err_printf1(":%ld)\n", (unsigned long)i);
 494         return(0);
 495     }
 496     if (!GC_debugging_started) {
 497         GC_start_debugging();
 498     }
 499     ADD_CALL_CHAIN(result, ra);
 500     return (GC_store_debug_info(result, (word)lb, s, (word)i));
 501 }
 502
 503 # ifdef __STDC__
 504     GC_PTR GC_debug_malloc_uncollectable(size_t lb, EXTRA_ARGS)
 505 # else
 506     GC_PTR GC_debug_malloc_uncollectable(lb, s, i)
 507     size_t lb;
 508     char * s;
 509     int i;
 510 # endif
 511 {
 512     GC_PTR result = GC_malloc_uncollectable(lb + DEBUG_BYTES);
 513
 514     if (result == 0) {
 515         GC_err_printf1("GC_debug_malloc_uncollectable(%ld) returning NIL (",
 516                       (unsigned long) lb);
 517         GC_err_puts(s);
 518         GC_err_printf1(":%ld)\n", (unsigned long)i);
 519         return(0);
 520     }
 521     if (!GC_debugging_started) {
 522         GC_start_debugging();
 523     }
 524     ADD_CALL_CHAIN(result, ra);
 525     return (GC_store_debug_info(result, (word)lb, s, (word)i));
 526 }
 527
 528 #ifdef ATOMIC_UNCOLLECTABLE
 529 # ifdef __STDC__
 530     GC_PTR GC_debug_malloc_atomic_uncollectable(size_t lb, EXTRA_ARGS)
 531 # else
 532     GC_PTR GC_debug_malloc_atomic_uncollectable(lb, s, i)
 533     size_t lb;
 534     char * s;
 535     int i;
 536 # endif
 537 {
 538     GC_PTR result = GC_malloc_atomic_uncollectable(lb + DEBUG_BYTES);
 539
 540     if (result == 0) {
 541         GC_err_printf1(
 542                 "GC_debug_malloc_atomic_uncollectable(%ld) returning NIL (",
 543                 (unsigned long) lb);
 544         GC_err_puts(s);
 545         GC_err_printf1(":%ld)\n", (unsigned long)i);
 546         return(0);
 547     }
 548     if (!GC_debugging_started) {
 549         GC_start_debugging();
 550     }
 551     ADD_CALL_CHAIN(result, ra);
 552     return (GC_store_debug_info(result, (word)lb, s, (word)i));
 553 }
 554 #endif /* ATOMIC_UNCOLLECTABLE */
 555
 556 # ifdef __STDC__
 557     void GC_debug_free(GC_PTR p)
 558 # else
 559     void GC_debug_free(p)
 560     GC_PTR p;
 561 # endif
 562 {
 563     register GC_PTR base;
 564     register ptr_t clobbered;
 565
 566     if (0 == p) return;
 567     base = GC_base(p);
 568     if (base == 0) {
 569         GC_err_printf1("Attempt to free invalid pointer %lx\n",
 570                        (unsigned long)p);
 571         ABORT("free(invalid pointer)");
 572     }
 573     if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
 574         GC_err_printf1(
 575                   "GC_debug_free called on pointer %lx wo debugging info\n",
 576                   (unsigned long)p);
 577     } else {
 578       clobbered = GC_check_annotated_obj((oh *)base);
 579       if (clobbered != 0) {
 580         if (((oh *)base) -> oh_sz == GC_size(base)) {
 581             GC_err_printf0(
 582                   "GC_debug_free: found previously deallocated (?) object at ");
 583         } else {
 584             GC_err_printf0("GC_debug_free: found smashed location at ");
 585         }
 586         GC_print_smashed_obj(p, clobbered);
 587       }
 588       /* Invalidate size */
 589       ((oh *)base) -> oh_sz = GC_size(base);
 590     }
 591     if (GC_find_leak) {
 592         GC_free(base);
 593     } else {
 594         register hdr * hhdr = HDR(p);
 595         GC_bool uncollectable = FALSE;
 596
 597         if (hhdr ->  hb_obj_kind == UNCOLLECTABLE) {
 598             uncollectable = TRUE;
 599         }
 600 #       ifdef ATOMIC_UNCOLLECTABLE
 601             if (hhdr ->  hb_obj_kind == AUNCOLLECTABLE) {
 602                     uncollectable = TRUE;
 603             }
 604 #       endif
 605         if (uncollectable) GC_free(base);
 606     } /* !GC_find_leak */
 607 }
 608
 609 # ifdef __STDC__
 610     GC_PTR GC_debug_realloc(GC_PTR p, size_t lb, EXTRA_ARGS)
 611 # else
 612     GC_PTR GC_debug_realloc(p, lb, s, i)
 613     GC_PTR p;
 614     size_t lb;
 615     char *s;
 616     int i;
 617 # endif
 618 {
 619     register GC_PTR base = GC_base(p);
 620     register ptr_t clobbered;
 621     register GC_PTR result;
 622     register size_t copy_sz = lb;
 623     register size_t old_sz;
 624     register hdr * hhdr;
 625
 626     if (p == 0) return(GC_debug_malloc(lb, OPT_RA s, i));
 627     if (base == 0) {
 628         GC_err_printf1(
 629               "Attempt to reallocate invalid pointer %lx\n", (unsigned long)p);
 630         ABORT("realloc(invalid pointer)");
 631     }
 632     if ((ptr_t)p - (ptr_t)base != sizeof(oh)) {
 633         GC_err_printf1(
 634                 "GC_debug_realloc called on pointer %lx wo debugging info\n",
 635                 (unsigned long)p);
 636         return(GC_realloc(p, lb));
 637     }
 638     hhdr = HDR(base);
 639     switch (hhdr -> hb_obj_kind) {
 640 #    ifdef STUBBORN_ALLOC
 641       case STUBBORN:
 642         result = GC_debug_malloc_stubborn(lb, OPT_RA s, i);
 643         break;
 644 #    endif
 645       case NORMAL:
 646         result = GC_debug_malloc(lb, OPT_RA s, i);
 647         break;
 648       case PTRFREE:
 649         result = GC_debug_malloc_atomic(lb, OPT_RA s, i);
 650         break;
 651       case UNCOLLECTABLE:
 652         result = GC_debug_malloc_uncollectable(lb, OPT_RA s, i);
 653         break;
 654 #    ifdef ATOMIC_UNCOLLECTABLE
 655       case AUNCOLLECTABLE:
 656         result = GC_debug_malloc_atomic_uncollectable(lb, OPT_RA s, i);
 657         break;
 658 #    endif
 659       default:
 660         GC_err_printf0("GC_debug_realloc: encountered bad kind\n");
 661         ABORT("bad kind");
 662     }
 663     clobbered = GC_check_annotated_obj((oh *)base);
 664     if (clobbered != 0) {
 665         GC_err_printf0("GC_debug_realloc: found smashed location at ");
 666         GC_print_smashed_obj(p, clobbered);
 667     }
 668     old_sz = ((oh *)base) -> oh_sz;
 669     if (old_sz < copy_sz) copy_sz = old_sz;
 670     if (result == 0) return(0);
 671     BCOPY(p, result,  copy_sz);
 672     GC_debug_free(p);
 673     return(result);
 674 }
 675
 676 /* Check all marked objects in the given block for validity */
 677 /*ARGSUSED*/
 678 void GC_check_heap_block(hbp, dummy)
 679 register struct hblk *hbp;      /* ptr to current heap block            */
 680 word dummy;
 681 {
 682     register struct hblkhdr * hhdr = HDR(hbp);
 683     register word sz = hhdr -> hb_sz;
 684     register int word_no;
 685     register word *p, *plim;
 686
 687     p = (word *)(hbp->hb_body);
 688     word_no = HDR_WORDS;
 689     if (sz > MAXOBJSZ) {
 690         plim = p;
 691     } else {
 692         plim = (word *)((((word)hbp) + HBLKSIZE) - WORDS_TO_BYTES(sz));
 693     }
 694     /* go through all words in block */
 695         while( p <= plim ) {
 696             if( mark_bit_from_hdr(hhdr, word_no)
 697                 && GC_has_debug_info((ptr_t)p)) {
 698                 ptr_t clobbered = GC_check_annotated_obj((oh *)p);
 699
 700                 if (clobbered != 0) {
 701                     GC_err_printf0(
 702                         "GC_check_heap_block: found smashed location at ");
 703                     GC_print_smashed_obj((ptr_t)p, clobbered);
 704                 }
 705             }
 706             word_no += sz;
 707             p += sz;
 708         }
 709 }
 710
 711
 712 /* This assumes that all accessible objects are marked, and that        */
 713 /* I hold the allocation lock.  Normally called by collector.           */
 714 void GC_check_heap_proc()
 715 {
 716 #   ifndef SMALL_CONFIG
 717         if (sizeof(oh) & (2 * sizeof(word) - 1) != 0) {
 718             ABORT("Alignment problem: object header has inappropriate size\n");
 719         }
 720 #   endif
 721     GC_apply_to_all_blocks(GC_check_heap_block, (word)0);
 722 }
 723
 724 struct closure {
 725     GC_finalization_proc cl_fn;
 726     GC_PTR cl_data;
 727 };
 728
 729 # ifdef __STDC__
 730     void * GC_make_closure(GC_finalization_proc fn, void * data)
 731 # else
 732     GC_PTR GC_make_closure(fn, data)
 733     GC_finalization_proc fn;
 734     GC_PTR data;
 735 # endif
 736 {
 737     struct closure * result =
 738                 (struct closure *) GC_malloc(sizeof (struct closure));
 739
 740     result -> cl_fn = fn;
 741     result -> cl_data = data;
 742     return((GC_PTR)result);
 743 }
 744
 745 # ifdef __STDC__
 746     void GC_debug_invoke_finalizer(void * obj, void * data)
 747 # else
 748     void GC_debug_invoke_finalizer(obj, data)
 749     char * obj;
 750     char * data;
 751 # endif
 752 {
 753     register struct closure * cl = (struct closure *) data;
 754
 755     (*(cl -> cl_fn))((GC_PTR)((char *)obj + sizeof(oh)), cl -> cl_data);
 756 }
 757
 758
 759 # ifdef __STDC__
 760     void GC_debug_register_finalizer(GC_PTR obj, GC_finalization_proc fn,
 761                                      GC_PTR cd, GC_finalization_proc *ofn,
 762                                      GC_PTR *ocd)
 763 # else
 764     void GC_debug_register_finalizer(obj, fn, cd, ofn, ocd)
 765     GC_PTR obj;
 766     GC_finalization_proc fn;
 767     GC_PTR cd;
 768     GC_finalization_proc *ofn;
 769     GC_PTR *ocd;
 770 # endif
 771 {
 772     ptr_t base = GC_base(obj);
 773     if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
 774         GC_err_printf1(
 775             "GC_register_finalizer called with non-base-pointer 0x%lx\n",
 776             obj);
 777     }
 778     GC_register_finalizer(base, GC_debug_invoke_finalizer,
 779                           GC_make_closure(fn,cd), ofn, ocd);
 780 }
 781
 782 # ifdef __STDC__
 783     void GC_debug_register_finalizer_no_order
 784                                     (GC_PTR obj, GC_finalization_proc fn,
 785                                      GC_PTR cd, GC_finalization_proc *ofn,
 786                                      GC_PTR *ocd)
 787 # else
 788     void GC_debug_register_finalizer_no_order
 789                                     (obj, fn, cd, ofn, ocd)
 790     GC_PTR obj;
 791     GC_finalization_proc fn;
 792     GC_PTR cd;
 793     GC_finalization_proc *ofn;
 794     GC_PTR *ocd;
 795 # endif
 796 {
 797     ptr_t base = GC_base(obj);
 798     if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
 799         GC_err_printf1(
 800           "GC_register_finalizer_no_order called with non-base-pointer 0x%lx\n",
 801           obj);
 802     }
 803     GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
 804                                       GC_make_closure(fn,cd), ofn, ocd);
 805  }
 806
 807 # ifdef __STDC__
 808     void GC_debug_register_finalizer_ignore_self
 809                                     (GC_PTR obj, GC_finalization_proc fn,
 810                                      GC_PTR cd, GC_finalization_proc *ofn,
 811                                      GC_PTR *ocd)
 812 # else
 813     void GC_debug_register_finalizer_no_order
 814                                     (obj, fn, cd, ofn, ocd)
 815     GC_PTR obj;
 816     GC_finalization_proc fn;
 817     GC_PTR cd;
 818     GC_finalization_proc *ofn;
 819     GC_PTR *ocd;
 820 # endif
 821 {
 822     ptr_t base = GC_base(obj);
 823     if (0 == base || (ptr_t)obj - base != sizeof(oh)) {
 824         GC_err_printf1(
 825             "GC_register_finalizer_no_order called with non-base-pointer 0x%lx\n",
 826             obj);
 827     }
 828     GC_register_finalizer_no_order(base, GC_debug_invoke_finalizer,
 829                                       GC_make_closure(fn,cd), ofn, ocd);
 830 }