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Annotation of OpenXM_contrib2/asir2000/gc/finalize.c, Revision 1.7

1.1       noro        1: /*
                      2:  * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
                      3:  * Copyright (c) 1991-1996 by Xerox Corporation.  All rights reserved.
1.2       noro        4:  * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
1.1       noro        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: /* Boehm, February 1, 1996 1:19 pm PST */
                     16: # define I_HIDE_POINTERS
1.4       noro       17: # include "private/gc_pmark.h"
1.1       noro       18:
1.2       noro       19: # ifdef FINALIZE_ON_DEMAND
                     20:     int GC_finalize_on_demand = 1;
                     21: # else
                     22:     int GC_finalize_on_demand = 0;
                     23: # endif
                     24:
                     25: # ifdef JAVA_FINALIZATION
                     26:     int GC_java_finalization = 1;
                     27: # else
                     28:     int GC_java_finalization = 0;
                     29: # endif
                     30:
1.1       noro       31: /* Type of mark procedure used for marking from finalizable object.    */
                     32: /* This procedure normally does not mark the object, only its          */
                     33: /* descendents.                                                                */
                     34: typedef void finalization_mark_proc(/* ptr_t finalizable_obj_ptr */);
                     35:
                     36: # define HASH3(addr,size,log_size) \
                     37:     ((((word)(addr) >> 3) ^ ((word)(addr) >> (3+(log_size)))) \
                     38:     & ((size) - 1))
                     39: #define HASH2(addr,log_size) HASH3(addr, 1 << log_size, log_size)
                     40:
                     41: struct hash_chain_entry {
                     42:     word hidden_key;
                     43:     struct hash_chain_entry * next;
                     44: };
                     45:
                     46: unsigned GC_finalization_failures = 0;
                     47:        /* Number of finalization requests that failed for lack of memory. */
                     48:
                     49: static struct disappearing_link {
                     50:     struct hash_chain_entry prolog;
                     51: #   define dl_hidden_link prolog.hidden_key
                     52:                                /* Field to be cleared.         */
                     53: #   define dl_next(x) (struct disappearing_link *)((x) -> prolog.next)
                     54: #   define dl_set_next(x,y) (x) -> prolog.next = (struct hash_chain_entry *)(y)
                     55:
                     56:     word dl_hidden_obj;                /* Pointer to object base       */
                     57: } **dl_head = 0;
                     58:
                     59: static signed_word log_dl_table_size = -1;
                     60:                        /* Binary log of                                */
                     61:                        /* current size of array pointed to by dl_head. */
                     62:                        /* -1 ==> size is 0.                            */
                     63:
                     64: word GC_dl_entries = 0;        /* Number of entries currently in disappearing  */
                     65:                        /* link table.                                  */
                     66:
                     67: static struct finalizable_object {
                     68:     struct hash_chain_entry prolog;
                     69: #   define fo_hidden_base prolog.hidden_key
                     70:                                /* Pointer to object base.      */
                     71:                                /* No longer hidden once object */
                     72:                                /* is on finalize_now queue.    */
                     73: #   define fo_next(x) (struct finalizable_object *)((x) -> prolog.next)
                     74: #   define fo_set_next(x,y) (x) -> prolog.next = (struct hash_chain_entry *)(y)
                     75:     GC_finalization_proc fo_fn;        /* Finalizer.                   */
                     76:     ptr_t fo_client_data;
                     77:     word fo_object_size;       /* In bytes.                    */
                     78:     finalization_mark_proc * fo_mark_proc;     /* Mark-through procedure */
                     79: } **fo_head = 0;
                     80:
                     81: struct finalizable_object * GC_finalize_now = 0;
                     82:        /* LIst of objects that should be finalized now.        */
                     83:
                     84: static signed_word log_fo_table_size = -1;
                     85:
                     86: word GC_fo_entries = 0;
                     87:
1.4       noro       88: void GC_push_finalizer_structures GC_PROTO((void))
1.1       noro       89: {
                     90:     GC_push_all((ptr_t)(&dl_head), (ptr_t)(&dl_head) + sizeof(word));
                     91:     GC_push_all((ptr_t)(&fo_head), (ptr_t)(&fo_head) + sizeof(word));
1.4       noro       92:     GC_push_all((ptr_t)(&GC_finalize_now),
                     93:                (ptr_t)(&GC_finalize_now) + sizeof(word));
1.1       noro       94: }
                     95:
                     96: /* Double the size of a hash table. *size_ptr is the log of its current        */
                     97: /* size.  May be a noop.                                               */
                     98: /* *table is a pointer to an array of hash headers.  If we succeed, we */
                     99: /* update both *table and *log_size_ptr.                               */
                    100: /* Lock is held.  Signals are disabled.                                        */
                    101: void GC_grow_table(table, log_size_ptr)
                    102: struct hash_chain_entry ***table;
                    103: signed_word * log_size_ptr;
                    104: {
                    105:     register word i;
                    106:     register struct hash_chain_entry *p;
                    107:     int log_old_size = *log_size_ptr;
                    108:     register int log_new_size = log_old_size + 1;
                    109:     word old_size = ((log_old_size == -1)? 0: (1 << log_old_size));
                    110:     register word new_size = 1 << log_new_size;
                    111:     struct hash_chain_entry **new_table = (struct hash_chain_entry **)
1.4       noro      112:        GC_INTERNAL_MALLOC_IGNORE_OFF_PAGE(
1.1       noro      113:                (size_t)new_size * sizeof(struct hash_chain_entry *), NORMAL);
                    114:
                    115:     if (new_table == 0) {
                    116:        if (table == 0) {
                    117:            ABORT("Insufficient space for initial table allocation");
                    118:        } else {
                    119:            return;
                    120:        }
                    121:     }
                    122:     for (i = 0; i < old_size; i++) {
                    123:       p = (*table)[i];
                    124:       while (p != 0) {
                    125:         register ptr_t real_key = (ptr_t)REVEAL_POINTER(p -> hidden_key);
                    126:         register struct hash_chain_entry *next = p -> next;
                    127:         register int new_hash = HASH3(real_key, new_size, log_new_size);
                    128:
                    129:         p -> next = new_table[new_hash];
                    130:         new_table[new_hash] = p;
                    131:         p = next;
                    132:       }
                    133:     }
                    134:     *log_size_ptr = log_new_size;
                    135:     *table = new_table;
                    136: }
                    137:
                    138: # if defined(__STDC__) || defined(__cplusplus)
                    139:     int GC_register_disappearing_link(GC_PTR * link)
                    140: # else
                    141:     int GC_register_disappearing_link(link)
                    142:     GC_PTR * link;
                    143: # endif
                    144: {
                    145:     ptr_t base;
                    146:
                    147:     base = (ptr_t)GC_base((GC_PTR)link);
                    148:     if (base == 0)
                    149:        ABORT("Bad arg to GC_register_disappearing_link");
                    150:     return(GC_general_register_disappearing_link(link, base));
                    151: }
                    152:
                    153: # if defined(__STDC__) || defined(__cplusplus)
                    154:     int GC_general_register_disappearing_link(GC_PTR * link,
                    155:                                              GC_PTR obj)
                    156: # else
                    157:     int GC_general_register_disappearing_link(link, obj)
                    158:     GC_PTR * link;
                    159:     GC_PTR obj;
                    160: # endif
                    161:
                    162: {
                    163:     struct disappearing_link *curr_dl;
                    164:     int index;
                    165:     struct disappearing_link * new_dl;
                    166:     DCL_LOCK_STATE;
                    167:
                    168:     if ((word)link & (ALIGNMENT-1))
                    169:        ABORT("Bad arg to GC_general_register_disappearing_link");
                    170: #   ifdef THREADS
                    171:        DISABLE_SIGNALS();
                    172:        LOCK();
                    173: #   endif
                    174:     if (log_dl_table_size == -1
                    175:         || GC_dl_entries > ((word)1 << log_dl_table_size)) {
                    176: #      ifndef THREADS
                    177:            DISABLE_SIGNALS();
                    178: #      endif
                    179:        GC_grow_table((struct hash_chain_entry ***)(&dl_head),
                    180:                      &log_dl_table_size);
1.4       noro      181: #      ifdef CONDPRINT
                    182:          if (GC_print_stats) {
1.1       noro      183:            GC_printf1("Grew dl table to %lu entries\n",
                    184:                        (unsigned long)(1 << log_dl_table_size));
1.4       noro      185:          }
1.1       noro      186: #      endif
                    187: #      ifndef THREADS
                    188:            ENABLE_SIGNALS();
                    189: #      endif
                    190:     }
                    191:     index = HASH2(link, log_dl_table_size);
                    192:     curr_dl = dl_head[index];
                    193:     for (curr_dl = dl_head[index]; curr_dl != 0; curr_dl = dl_next(curr_dl)) {
                    194:         if (curr_dl -> dl_hidden_link == HIDE_POINTER(link)) {
                    195:             curr_dl -> dl_hidden_obj = HIDE_POINTER(obj);
                    196: #          ifdef THREADS
                    197:                 UNLOCK();
                    198:                ENABLE_SIGNALS();
                    199: #          endif
                    200:             return(1);
                    201:         }
                    202:     }
1.4       noro      203:     new_dl = (struct disappearing_link *)
                    204:        GC_INTERNAL_MALLOC(sizeof(struct disappearing_link),NORMAL);
1.6       noro      205:     if (0 == new_dl) {
                    206: #     ifdef THREADS
                    207:        UNLOCK();
                    208:        ENABLE_SIGNALS();
                    209: #     endif
                    210:       new_dl = (struct disappearing_link *)
                    211:              GC_oom_fn(sizeof(struct disappearing_link));
                    212:       if (0 == new_dl) {
                    213:        GC_finalization_failures++;
                    214:        return(0);
                    215:       }
                    216:       /* It's not likely we'll make it here, but ... */
                    217: #     ifdef THREADS
                    218:         DISABLE_SIGNALS();
                    219:        LOCK();
                    220: #     endif
1.1       noro      221:     }
1.6       noro      222:     new_dl -> dl_hidden_obj = HIDE_POINTER(obj);
                    223:     new_dl -> dl_hidden_link = HIDE_POINTER(link);
                    224:     dl_set_next(new_dl, dl_head[index]);
                    225:     dl_head[index] = new_dl;
                    226:     GC_dl_entries++;
1.1       noro      227: #   ifdef THREADS
                    228:         UNLOCK();
                    229:         ENABLE_SIGNALS();
                    230: #   endif
                    231:     return(0);
                    232: }
                    233:
                    234: # if defined(__STDC__) || defined(__cplusplus)
                    235:     int GC_unregister_disappearing_link(GC_PTR * link)
                    236: # else
                    237:     int GC_unregister_disappearing_link(link)
                    238:     GC_PTR * link;
                    239: # endif
                    240: {
                    241:     struct disappearing_link *curr_dl, *prev_dl;
                    242:     int index;
                    243:     DCL_LOCK_STATE;
                    244:
                    245:     DISABLE_SIGNALS();
                    246:     LOCK();
                    247:     index = HASH2(link, log_dl_table_size);
                    248:     if (((unsigned long)link & (ALIGNMENT-1))) goto out;
                    249:     prev_dl = 0; curr_dl = dl_head[index];
                    250:     while (curr_dl != 0) {
                    251:         if (curr_dl -> dl_hidden_link == HIDE_POINTER(link)) {
                    252:             if (prev_dl == 0) {
                    253:                 dl_head[index] = dl_next(curr_dl);
                    254:             } else {
                    255:                 dl_set_next(prev_dl, dl_next(curr_dl));
                    256:             }
                    257:             GC_dl_entries--;
                    258:             UNLOCK();
                    259:            ENABLE_SIGNALS();
1.4       noro      260: #          ifdef DBG_HDRS_ALL
1.6       noro      261:              dl_set_next(curr_dl, 0);
1.4       noro      262: #          else
                    263:               GC_free((GC_PTR)curr_dl);
                    264: #          endif
1.1       noro      265:             return(1);
                    266:         }
                    267:         prev_dl = curr_dl;
                    268:         curr_dl = dl_next(curr_dl);
                    269:     }
                    270: out:
                    271:     UNLOCK();
                    272:     ENABLE_SIGNALS();
                    273:     return(0);
                    274: }
                    275:
                    276: /* Possible finalization_marker procedures.  Note that mark stack      */
                    277: /* overflow is handled by the caller, and is not a disaster.           */
1.2       noro      278: GC_API void GC_normal_finalize_mark_proc(p)
1.1       noro      279: ptr_t p;
                    280: {
                    281:     hdr * hhdr = HDR(p);
                    282:
                    283:     PUSH_OBJ((word *)p, hhdr, GC_mark_stack_top,
                    284:             &(GC_mark_stack[GC_mark_stack_size]));
                    285: }
                    286:
                    287: /* This only pays very partial attention to the mark descriptor.       */
                    288: /* It does the right thing for normal and atomic objects, and treats   */
                    289: /* most others as normal.                                              */
1.2       noro      290: GC_API void GC_ignore_self_finalize_mark_proc(p)
1.1       noro      291: ptr_t p;
                    292: {
                    293:     hdr * hhdr = HDR(p);
                    294:     word descr = hhdr -> hb_descr;
                    295:     ptr_t q, r;
                    296:     ptr_t scan_limit;
                    297:     ptr_t target_limit = p + WORDS_TO_BYTES(hhdr -> hb_sz) - 1;
                    298:
1.4       noro      299:     if ((descr & GC_DS_TAGS) == GC_DS_LENGTH) {
1.1       noro      300:        scan_limit = p + descr - sizeof(word);
                    301:     } else {
                    302:        scan_limit = target_limit + 1 - sizeof(word);
                    303:     }
                    304:     for (q = p; q <= scan_limit; q += ALIGNMENT) {
                    305:        r = *(ptr_t *)q;
                    306:        if (r < p || r > target_limit) {
                    307:            GC_PUSH_ONE_HEAP((word)r, q);
                    308:        }
                    309:     }
                    310: }
                    311:
                    312: /*ARGSUSED*/
1.2       noro      313: GC_API void GC_null_finalize_mark_proc(p)
1.1       noro      314: ptr_t p;
                    315: {
                    316: }
                    317:
                    318:
                    319:
                    320: /* Register a finalization function.  See gc.h for details.    */
                    321: /* in the nonthreads case, we try to avoid disabling signals,  */
                    322: /* since it can be expensive.  Threads packages typically      */
                    323: /* make it cheaper.                                            */
1.2       noro      324: /* The last parameter is a procedure that determines           */
                    325: /* marking for finalization ordering.  Any objects marked      */
                    326: /* by that procedure will be guaranteed to not have been       */
                    327: /* finalized when this finalizer is invoked.                   */
                    328: GC_API void GC_register_finalizer_inner(obj, fn, cd, ofn, ocd, mp)
1.1       noro      329: GC_PTR obj;
                    330: GC_finalization_proc fn;
                    331: GC_PTR cd;
                    332: GC_finalization_proc * ofn;
                    333: GC_PTR * ocd;
                    334: finalization_mark_proc * mp;
                    335: {
                    336:     ptr_t base;
                    337:     struct finalizable_object * curr_fo, * prev_fo;
                    338:     int index;
                    339:     struct finalizable_object *new_fo;
1.4       noro      340:     hdr *hhdr;
1.1       noro      341:     DCL_LOCK_STATE;
                    342:
                    343: #   ifdef THREADS
                    344:        DISABLE_SIGNALS();
                    345:        LOCK();
                    346: #   endif
                    347:     if (log_fo_table_size == -1
                    348:         || GC_fo_entries > ((word)1 << log_fo_table_size)) {
                    349: #      ifndef THREADS
                    350:            DISABLE_SIGNALS();
                    351: #      endif
                    352:        GC_grow_table((struct hash_chain_entry ***)(&fo_head),
                    353:                      &log_fo_table_size);
1.4       noro      354: #      ifdef CONDPRINT
                    355:          if (GC_print_stats) {
1.1       noro      356:            GC_printf1("Grew fo table to %lu entries\n",
                    357:                        (unsigned long)(1 << log_fo_table_size));
1.4       noro      358:          }
1.1       noro      359: #      endif
                    360: #      ifndef THREADS
                    361:            ENABLE_SIGNALS();
                    362: #      endif
                    363:     }
                    364:     /* in the THREADS case signals are disabled and we hold allocation */
                    365:     /* lock; otherwise neither is true.  Proceed carefully.            */
                    366:     base = (ptr_t)obj;
                    367:     index = HASH2(base, log_fo_table_size);
                    368:     prev_fo = 0; curr_fo = fo_head[index];
                    369:     while (curr_fo != 0) {
                    370:         if (curr_fo -> fo_hidden_base == HIDE_POINTER(base)) {
                    371:             /* Interruption by a signal in the middle of this  */
                    372:             /* should be safe.  The client may see only *ocd   */
                    373:             /* updated, but we'll declare that to be his       */
                    374:             /* problem.                                                */
                    375:             if (ocd) *ocd = (GC_PTR) curr_fo -> fo_client_data;
                    376:             if (ofn) *ofn = curr_fo -> fo_fn;
                    377:             /* Delete the structure for base. */
                    378:                 if (prev_fo == 0) {
                    379:                   fo_head[index] = fo_next(curr_fo);
                    380:                 } else {
                    381:                   fo_set_next(prev_fo, fo_next(curr_fo));
                    382:                 }
                    383:             if (fn == 0) {
                    384:                 GC_fo_entries--;
                    385:                   /* May not happen if we get a signal.  But a high    */
                    386:                   /* estimate will only make the table larger than     */
                    387:                   /* necessary.                                                */
1.4       noro      388: #              if !defined(THREADS) && !defined(DBG_HDRS_ALL)
1.1       noro      389:                   GC_free((GC_PTR)curr_fo);
                    390: #              endif
                    391:             } else {
                    392:                 curr_fo -> fo_fn = fn;
                    393:                 curr_fo -> fo_client_data = (ptr_t)cd;
                    394:                 curr_fo -> fo_mark_proc = mp;
                    395:                /* Reinsert it.  We deleted it first to maintain        */
                    396:                /* consistency in the event of a signal.                */
                    397:                if (prev_fo == 0) {
                    398:                   fo_head[index] = curr_fo;
                    399:                 } else {
                    400:                   fo_set_next(prev_fo, curr_fo);
                    401:                 }
                    402:             }
                    403: #          ifdef THREADS
                    404:                 UNLOCK();
                    405:                ENABLE_SIGNALS();
                    406: #          endif
                    407:             return;
                    408:         }
                    409:         prev_fo = curr_fo;
                    410:         curr_fo = fo_next(curr_fo);
                    411:     }
                    412:     if (ofn) *ofn = 0;
                    413:     if (ocd) *ocd = 0;
                    414:     if (fn == 0) {
                    415: #      ifdef THREADS
                    416:             UNLOCK();
                    417:            ENABLE_SIGNALS();
                    418: #      endif
                    419:         return;
                    420:     }
1.4       noro      421:     GET_HDR(base, hhdr);
                    422:     if (0 == hhdr) {
                    423:       /* We won't collect it, hence finalizer wouldn't be run. */
                    424: #     ifdef THREADS
                    425:           UNLOCK();
                    426:          ENABLE_SIGNALS();
                    427: #     endif
                    428:       return;
                    429:     }
                    430:     new_fo = (struct finalizable_object *)
                    431:        GC_INTERNAL_MALLOC(sizeof(struct finalizable_object),NORMAL);
1.6       noro      432:     if (0 == new_fo) {
                    433: #     ifdef THREADS
                    434:        UNLOCK();
                    435:        ENABLE_SIGNALS();
                    436: #     endif
                    437:       new_fo = (struct finalizable_object *)
                    438:              GC_oom_fn(sizeof(struct finalizable_object));
                    439:       if (0 == new_fo) {
                    440:        GC_finalization_failures++;
                    441:        return;
                    442:       }
                    443:       /* It's not likely we'll make it here, but ... */
                    444: #     ifdef THREADS
                    445:         DISABLE_SIGNALS();
                    446:        LOCK();
                    447: #     endif
1.1       noro      448:     }
1.6       noro      449:     new_fo -> fo_hidden_base = (word)HIDE_POINTER(base);
                    450:     new_fo -> fo_fn = fn;
                    451:     new_fo -> fo_client_data = (ptr_t)cd;
                    452:     new_fo -> fo_object_size = hhdr -> hb_sz;
                    453:     new_fo -> fo_mark_proc = mp;
                    454:     fo_set_next(new_fo, fo_head[index]);
                    455:     GC_fo_entries++;
                    456:     fo_head[index] = new_fo;
1.1       noro      457: #   ifdef THREADS
                    458:         UNLOCK();
                    459:        ENABLE_SIGNALS();
                    460: #   endif
                    461: }
                    462:
                    463: # if defined(__STDC__)
                    464:     void GC_register_finalizer(void * obj,
                    465:                               GC_finalization_proc fn, void * cd,
                    466:                               GC_finalization_proc *ofn, void ** ocd)
                    467: # else
                    468:     void GC_register_finalizer(obj, fn, cd, ofn, ocd)
                    469:     GC_PTR obj;
                    470:     GC_finalization_proc fn;
                    471:     GC_PTR cd;
                    472:     GC_finalization_proc * ofn;
                    473:     GC_PTR * ocd;
                    474: # endif
                    475: {
                    476:     GC_register_finalizer_inner(obj, fn, cd, ofn,
                    477:                                ocd, GC_normal_finalize_mark_proc);
                    478: }
                    479:
                    480: # if defined(__STDC__)
                    481:     void GC_register_finalizer_ignore_self(void * obj,
                    482:                               GC_finalization_proc fn, void * cd,
                    483:                               GC_finalization_proc *ofn, void ** ocd)
                    484: # else
                    485:     void GC_register_finalizer_ignore_self(obj, fn, cd, ofn, ocd)
                    486:     GC_PTR obj;
                    487:     GC_finalization_proc fn;
                    488:     GC_PTR cd;
                    489:     GC_finalization_proc * ofn;
                    490:     GC_PTR * ocd;
                    491: # endif
                    492: {
                    493:     GC_register_finalizer_inner(obj, fn, cd, ofn,
                    494:                                ocd, GC_ignore_self_finalize_mark_proc);
                    495: }
                    496:
                    497: # if defined(__STDC__)
                    498:     void GC_register_finalizer_no_order(void * obj,
                    499:                               GC_finalization_proc fn, void * cd,
                    500:                               GC_finalization_proc *ofn, void ** ocd)
                    501: # else
                    502:     void GC_register_finalizer_no_order(obj, fn, cd, ofn, ocd)
                    503:     GC_PTR obj;
                    504:     GC_finalization_proc fn;
                    505:     GC_PTR cd;
                    506:     GC_finalization_proc * ofn;
                    507:     GC_PTR * ocd;
                    508: # endif
                    509: {
                    510:     GC_register_finalizer_inner(obj, fn, cd, ofn,
                    511:                                ocd, GC_null_finalize_mark_proc);
                    512: }
                    513:
1.4       noro      514: #ifndef NO_DEBUGGING
                    515: void GC_dump_finalization()
                    516: {
                    517:     struct disappearing_link * curr_dl;
                    518:     struct finalizable_object * curr_fo;
                    519:     ptr_t real_ptr, real_link;
                    520:     int dl_size = (log_dl_table_size == -1 ) ? 0 : (1 << log_dl_table_size);
                    521:     int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
                    522:     int i;
                    523:
                    524:     GC_printf0("Disappearing links:\n");
                    525:     for (i = 0; i < dl_size; i++) {
                    526:       for (curr_dl = dl_head[i]; curr_dl != 0; curr_dl = dl_next(curr_dl)) {
                    527:         real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
                    528:         real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
                    529:         GC_printf2("Object: 0x%lx, Link:0x%lx\n", real_ptr, real_link);
                    530:       }
                    531:     }
                    532:     GC_printf0("Finalizers:\n");
                    533:     for (i = 0; i < fo_size; i++) {
                    534:       for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) {
                    535:         real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
                    536:         GC_printf1("Finalizable object: 0x%lx\n", real_ptr);
                    537:       }
                    538:     }
                    539: }
                    540: #endif
                    541:
1.1       noro      542: /* Called with world stopped.  Cause disappearing links to disappear,  */
                    543: /* and invoke finalizers.                                              */
                    544: void GC_finalize()
                    545: {
                    546:     struct disappearing_link * curr_dl, * prev_dl, * next_dl;
                    547:     struct finalizable_object * curr_fo, * prev_fo, * next_fo;
                    548:     ptr_t real_ptr, real_link;
                    549:     register int i;
                    550:     int dl_size = (log_dl_table_size == -1 ) ? 0 : (1 << log_dl_table_size);
                    551:     int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
                    552:
                    553:   /* Make disappearing links disappear */
                    554:     for (i = 0; i < dl_size; i++) {
                    555:       curr_dl = dl_head[i];
                    556:       prev_dl = 0;
                    557:       while (curr_dl != 0) {
                    558:         real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
                    559:         real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
                    560:         if (!GC_is_marked(real_ptr)) {
                    561:             *(word *)real_link = 0;
                    562:             next_dl = dl_next(curr_dl);
                    563:             if (prev_dl == 0) {
                    564:                 dl_head[i] = next_dl;
                    565:             } else {
                    566:                 dl_set_next(prev_dl, next_dl);
                    567:             }
                    568:             GC_clear_mark_bit((ptr_t)curr_dl);
                    569:             GC_dl_entries--;
                    570:             curr_dl = next_dl;
                    571:         } else {
                    572:             prev_dl = curr_dl;
                    573:             curr_dl = dl_next(curr_dl);
                    574:         }
                    575:       }
                    576:     }
                    577:   /* Mark all objects reachable via chains of 1 or more pointers       */
                    578:   /* from finalizable objects.                                         */
1.4       noro      579:     GC_ASSERT(GC_mark_state == MS_NONE);
1.1       noro      580:     for (i = 0; i < fo_size; i++) {
                    581:       for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) {
                    582:         real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
                    583:         if (!GC_is_marked(real_ptr)) {
                    584:            GC_MARKED_FOR_FINALIZATION(real_ptr);
                    585:             GC_MARK_FO(real_ptr, curr_fo -> fo_mark_proc);
                    586:             if (GC_is_marked(real_ptr)) {
                    587:                 WARN("Finalization cycle involving %lx\n", real_ptr);
                    588:             }
                    589:         }
                    590:       }
                    591:     }
                    592:   /* Enqueue for finalization all objects that are still               */
                    593:   /* unreachable.                                                      */
                    594:     GC_words_finalized = 0;
                    595:     for (i = 0; i < fo_size; i++) {
                    596:       curr_fo = fo_head[i];
                    597:       prev_fo = 0;
                    598:       while (curr_fo != 0) {
                    599:         real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
                    600:         if (!GC_is_marked(real_ptr)) {
1.2       noro      601:            if (!GC_java_finalization) {
                    602:               GC_set_mark_bit(real_ptr);
                    603:            }
1.1       noro      604:             /* Delete from hash table */
                    605:               next_fo = fo_next(curr_fo);
                    606:               if (prev_fo == 0) {
                    607:                 fo_head[i] = next_fo;
                    608:               } else {
                    609:                 fo_set_next(prev_fo, next_fo);
                    610:               }
                    611:               GC_fo_entries--;
                    612:             /* Add to list of objects awaiting finalization.   */
                    613:               fo_set_next(curr_fo, GC_finalize_now);
                    614:               GC_finalize_now = curr_fo;
                    615:               /* unhide object pointer so any future collections will  */
                    616:               /* see it.                                               */
                    617:               curr_fo -> fo_hidden_base =
                    618:                        (word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
                    619:               GC_words_finalized +=
                    620:                        ALIGNED_WORDS(curr_fo -> fo_object_size)
                    621:                        + ALIGNED_WORDS(sizeof(struct finalizable_object));
1.6       noro      622:            GC_ASSERT(GC_is_marked(GC_base((ptr_t)curr_fo)));
1.1       noro      623:             curr_fo = next_fo;
                    624:         } else {
                    625:             prev_fo = curr_fo;
                    626:             curr_fo = fo_next(curr_fo);
                    627:         }
                    628:       }
                    629:     }
                    630:
1.2       noro      631:   if (GC_java_finalization) {
                    632:     /* make sure we mark everything reachable from objects finalized
                    633:        using the no_order mark_proc */
                    634:       for (curr_fo = GC_finalize_now;
                    635:         curr_fo != NULL; curr_fo = fo_next(curr_fo)) {
                    636:        real_ptr = (ptr_t)curr_fo -> fo_hidden_base;
                    637:        if (!GC_is_marked(real_ptr)) {
                    638:            if (curr_fo -> fo_mark_proc == GC_null_finalize_mark_proc) {
                    639:                GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc);
                    640:            }
                    641:            GC_set_mark_bit(real_ptr);
                    642:        }
                    643:       }
                    644:   }
1.1       noro      645:
                    646:   /* Remove dangling disappearing links. */
                    647:     for (i = 0; i < dl_size; i++) {
                    648:       curr_dl = dl_head[i];
                    649:       prev_dl = 0;
                    650:       while (curr_dl != 0) {
                    651:         real_link = GC_base((ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link));
                    652:         if (real_link != 0 && !GC_is_marked(real_link)) {
                    653:             next_dl = dl_next(curr_dl);
                    654:             if (prev_dl == 0) {
                    655:                 dl_head[i] = next_dl;
                    656:             } else {
                    657:                 dl_set_next(prev_dl, next_dl);
                    658:             }
                    659:             GC_clear_mark_bit((ptr_t)curr_dl);
                    660:             GC_dl_entries--;
                    661:             curr_dl = next_dl;
                    662:         } else {
                    663:             prev_dl = curr_dl;
                    664:             curr_dl = dl_next(curr_dl);
                    665:         }
                    666:       }
                    667:     }
                    668: }
                    669:
1.2       noro      670: #ifndef JAVA_FINALIZATION_NOT_NEEDED
1.1       noro      671:
                    672: /* Enqueue all remaining finalizers to be run - Assumes lock is
                    673:  * held, and signals are disabled */
                    674: void GC_enqueue_all_finalizers()
                    675: {
                    676:     struct finalizable_object * curr_fo, * prev_fo, * next_fo;
1.3       noro      677:     ptr_t real_ptr;
1.1       noro      678:     register int i;
                    679:     int fo_size;
                    680:
                    681:     fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
                    682:     GC_words_finalized = 0;
                    683:     for (i = 0; i < fo_size; i++) {
                    684:         curr_fo = fo_head[i];
                    685:         prev_fo = 0;
                    686:       while (curr_fo != 0) {
                    687:           real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
                    688:           GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc);
                    689:           GC_set_mark_bit(real_ptr);
                    690:
                    691:           /* Delete from hash table */
                    692:           next_fo = fo_next(curr_fo);
                    693:           if (prev_fo == 0) {
                    694:               fo_head[i] = next_fo;
                    695:           } else {
                    696:               fo_set_next(prev_fo, next_fo);
                    697:           }
                    698:           GC_fo_entries--;
                    699:
                    700:           /* Add to list of objects awaiting finalization.     */
                    701:           fo_set_next(curr_fo, GC_finalize_now);
                    702:           GC_finalize_now = curr_fo;
                    703:
                    704:           /* unhide object pointer so any future collections will      */
                    705:           /* see it.                                           */
                    706:           curr_fo -> fo_hidden_base =
                    707:                        (word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
                    708:
                    709:           GC_words_finalized +=
                    710:                ALIGNED_WORDS(curr_fo -> fo_object_size)
                    711:                        + ALIGNED_WORDS(sizeof(struct finalizable_object));
                    712:           curr_fo = next_fo;
                    713:         }
                    714:     }
                    715:
                    716:     return;
                    717: }
                    718:
                    719: /* Invoke all remaining finalizers that haven't yet been run.
                    720:  * This is needed for strict compliance with the Java standard,
                    721:  * which can make the runtime guarantee that all finalizers are run.
                    722:  * Unfortunately, the Java standard implies we have to keep running
                    723:  * finalizers until there are no more left, a potential infinite loop.
                    724:  * YUCK.
1.2       noro      725:  * Note that this is even more dangerous than the usual Java
                    726:  * finalizers, in that objects reachable from static variables
                    727:  * may have been finalized when these finalizers are run.
                    728:  * Finalizers run at this point must be prepared to deal with a
                    729:  * mostly broken world.
1.1       noro      730:  * This routine is externally callable, so is called without
                    731:  * the allocation lock.
                    732:  */
1.2       noro      733: GC_API void GC_finalize_all()
1.1       noro      734: {
                    735:     DCL_LOCK_STATE;
                    736:
                    737:     DISABLE_SIGNALS();
                    738:     LOCK();
                    739:     while (GC_fo_entries > 0) {
                    740:       GC_enqueue_all_finalizers();
                    741:       UNLOCK();
                    742:       ENABLE_SIGNALS();
                    743:       GC_INVOKE_FINALIZERS();
                    744:       DISABLE_SIGNALS();
                    745:       LOCK();
                    746:     }
                    747:     UNLOCK();
                    748:     ENABLE_SIGNALS();
                    749: }
                    750: #endif
1.3       noro      751:
                    752: /* Returns true if it is worth calling GC_invoke_finalizers. (Useful if        */
                    753: /* finalizers can only be called from some kind of `safe state' and    */
                    754: /* getting into that safe state is expensive.)                         */
                    755: int GC_should_invoke_finalizers GC_PROTO((void))
                    756: {
                    757:     return GC_finalize_now != 0;
                    758: }
1.1       noro      759:
                    760: /* Invoke finalizers for all objects that are ready to be finalized.   */
                    761: /* Should be called without allocation lock.                           */
                    762: int GC_invoke_finalizers()
                    763: {
1.6       noro      764:     struct finalizable_object * curr_fo;
                    765:     int count = 0;
                    766:     word mem_freed_before;
1.1       noro      767:     DCL_LOCK_STATE;
                    768:
                    769:     while (GC_finalize_now != 0) {
                    770: #      ifdef THREADS
                    771:            DISABLE_SIGNALS();
                    772:            LOCK();
                    773: #      endif
1.7     ! noro      774:        if (count == 0) {
1.6       noro      775:            mem_freed_before = GC_mem_freed;
                    776:        }
1.1       noro      777:        curr_fo = GC_finalize_now;
                    778: #      ifdef THREADS
                    779:            if (curr_fo != 0) GC_finalize_now = fo_next(curr_fo);
                    780:            UNLOCK();
                    781:            ENABLE_SIGNALS();
                    782:            if (curr_fo == 0) break;
                    783: #      else
                    784:            GC_finalize_now = fo_next(curr_fo);
                    785: #      endif
                    786:        fo_set_next(curr_fo, 0);
                    787:        (*(curr_fo -> fo_fn))((ptr_t)(curr_fo -> fo_hidden_base),
                    788:                              curr_fo -> fo_client_data);
                    789:        curr_fo -> fo_client_data = 0;
                    790:        ++count;
                    791: #      ifdef UNDEFINED
                    792:            /* This is probably a bad idea.  It throws off accounting if */
                    793:            /* nearly all objects are finalizable.  O.w. it shouldn't    */
                    794:            /* matter.                                                   */
                    795:            GC_free((GC_PTR)curr_fo);
                    796: #      endif
                    797:     }
1.7     ! noro      798:     if (count != 0 && mem_freed_before != GC_mem_freed) {
1.6       noro      799:         LOCK();
                    800:        GC_finalizer_mem_freed += (GC_mem_freed - mem_freed_before);
                    801:        UNLOCK();
                    802:     }
1.1       noro      803:     return count;
                    804: }
                    805:
1.4       noro      806: void (* GC_finalizer_notifier)() = (void (*) GC_PROTO((void)))0;
                    807:
                    808: static GC_word last_finalizer_notification = 0;
                    809:
                    810: void GC_notify_or_invoke_finalizers GC_PROTO((void))
                    811: {
                    812:     if (GC_finalize_now == 0) return;
                    813:     if (!GC_finalize_on_demand) {
                    814:        (void) GC_invoke_finalizers();
1.7     ! noro      815: #      ifndef THREADS
        !           816:          GC_ASSERT(GC_finalize_now == 0);
        !           817: #      endif   /* Otherwise GC can run concurrently and add more */
1.4       noro      818:        return;
                    819:     }
                    820:     if (GC_finalizer_notifier != (void (*) GC_PROTO((void)))0
                    821:        && last_finalizer_notification != GC_gc_no) {
                    822:        last_finalizer_notification = GC_gc_no;
                    823:        GC_finalizer_notifier();
                    824:     }
                    825: }
                    826:
1.1       noro      827: # ifdef __STDC__
                    828:     GC_PTR GC_call_with_alloc_lock(GC_fn_type fn,
                    829:                                         GC_PTR client_data)
                    830: # else
                    831:     GC_PTR GC_call_with_alloc_lock(fn, client_data)
                    832:     GC_fn_type fn;
                    833:     GC_PTR client_data;
                    834: # endif
                    835: {
                    836:     GC_PTR result;
                    837:     DCL_LOCK_STATE;
                    838:
                    839: #   ifdef THREADS
                    840:       DISABLE_SIGNALS();
                    841:       LOCK();
                    842:       SET_LOCK_HOLDER();
                    843: #   endif
                    844:     result = (*fn)(client_data);
                    845: #   ifdef THREADS
1.4       noro      846: #     ifndef GC_ASSERTIONS
                    847:         UNSET_LOCK_HOLDER();
                    848: #     endif /* o.w. UNLOCK() does it implicitly */
1.1       noro      849:       UNLOCK();
                    850:       ENABLE_SIGNALS();
                    851: #   endif
                    852:     return(result);
                    853: }
1.6       noro      854:
1.7     ! noro      855: #if !defined(NO_DEBUGGING)
        !           856:
        !           857: void GC_print_finalization_stats()
        !           858: {
        !           859:     struct finalizable_object *fo = GC_finalize_now;
        !           860:     size_t ready = 0;
        !           861:
        !           862:     GC_printf2("%lu finalization table entries; %lu disappearing links\n",
        !           863:               GC_fo_entries, GC_dl_entries);
        !           864:     for (; 0 != fo; fo = fo_next(fo)) ++ready;
        !           865:     GC_printf1("%lu objects are eligible for immediate finalization\n", ready);
        !           866: }
        !           867:
        !           868: #endif /* NO_DEBUGGING */

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