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Annotation of OpenXM/src/kan96xx/gc-4.14/reclaim.c, Revision 1.1.1.1

1.1       maekawa     1: /*
                      2:  * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
                      3:  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
                      4:  *
                      5:  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
                      6:  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
                      7:  *
                      8:  * Permission is hereby granted to use or copy this program
                      9:  * for any purpose,  provided the above notices are retained on all copies.
                     10:  * Permission to modify the code and to distribute modified code is granted,
                     11:  * provided the above notices are retained, and a notice that the code was
                     12:  * modified is included with the above copyright notice.
                     13:  */
                     14: /* Boehm, February 15, 1996 2:41 pm PST */
                     15:
                     16: #include <stdio.h>
                     17: #include "gc_priv.h"
                     18:
                     19: signed_word GC_mem_found = 0;
                     20:                        /* Number of words of memory reclaimed     */
                     21:
                     22: # ifdef FIND_LEAK
                     23: static void report_leak(p, sz)
                     24: ptr_t p;
                     25: word sz;
                     26: {
                     27:     if (HDR(p) -> hb_obj_kind == PTRFREE) {
                     28:         GC_err_printf0("Leaked atomic object at ");
                     29:     } else {
                     30:         GC_err_printf0("Leaked composite object at ");
                     31:     }
                     32:     if (GC_debugging_started && GC_has_debug_info(p)) {
                     33:         GC_print_obj(p);
                     34:     } else {
                     35:         GC_err_printf2("0x%lx (appr. size = %ld)\n",
                     36:                              (unsigned long)p,
                     37:                              (unsigned long)WORDS_TO_BYTES(sz));
                     38:     }
                     39: }
                     40:
                     41: #   define FOUND_FREE(hblk, word_no) \
                     42:       if (abort_if_found) { \
                     43:          report_leak((ptr_t)hblk + WORDS_TO_BYTES(word_no), \
                     44:                     HDR(hblk) -> hb_sz); \
                     45:       }
                     46: # else
                     47: #   define FOUND_FREE(hblk, word_no)
                     48: # endif
                     49:
                     50: /*
                     51:  * reclaim phase
                     52:  *
                     53:  */
                     54:
                     55:
                     56: /*
                     57:  * Test whether a block is completely empty, i.e. contains no marked
                     58:  * objects.  This does not require the block to be in physical
                     59:  * memory.
                     60:  */
                     61:
                     62: GC_bool GC_block_empty(hhdr)
                     63: register hdr * hhdr;
                     64: {
                     65:     register word *p = (word *)(&(hhdr -> hb_marks[0]));
                     66:     register word * plim =
                     67:                        (word *)(&(hhdr -> hb_marks[MARK_BITS_SZ]));
                     68:     while (p < plim) {
                     69:        if (*p++) return(FALSE);
                     70:     }
                     71:     return(TRUE);
                     72: }
                     73:
                     74: # ifdef GATHERSTATS
                     75: #   define INCR_WORDS(sz) n_words_found += (sz)
                     76: # else
                     77: #   define INCR_WORDS(sz)
                     78: # endif
                     79: /*
                     80:  * Restore unmarked small objects in h of size sz to the object
                     81:  * free list.  Returns the new list.
                     82:  * Clears unmarked objects.
                     83:  */
                     84: /*ARGSUSED*/
                     85: ptr_t GC_reclaim_clear(hbp, hhdr, sz, list, abort_if_found)
                     86: register struct hblk *hbp;     /* ptr to current heap block            */
                     87: register hdr * hhdr;
                     88: GC_bool abort_if_found;                /* Abort if a reclaimable object is found */
                     89: register ptr_t list;
                     90: register word sz;
                     91: {
                     92:     register int word_no;
                     93:     register word *p, *q, *plim;
                     94: #   ifdef GATHERSTATS
                     95:         register int n_words_found = 0;
                     96: #   endif
                     97:
                     98:     p = (word *)(hbp->hb_body);
                     99:     word_no = HDR_WORDS;
                    100:     plim = (word *)((((word)hbp) + HBLKSIZE)
                    101:                   - WORDS_TO_BYTES(sz));
                    102:
                    103:     /* go through all words in block */
                    104:        while( p <= plim )  {
                    105:            if( mark_bit_from_hdr(hhdr, word_no) ) {
                    106:                p += sz;
                    107:            } else {
                    108:                FOUND_FREE(hbp, word_no);
                    109:                INCR_WORDS(sz);
                    110:                /* object is available - put on list */
                    111:                    obj_link(p) = list;
                    112:                    list = ((ptr_t)p);
                    113:                /* Clear object, advance p to next object in the process */
                    114:                    q = p + sz;
                    115:                     p++; /* Skip link field */
                    116:                     while (p < q) {
                    117:                        *p++ = 0;
                    118:                    }
                    119:            }
                    120:            word_no += sz;
                    121:        }
                    122: #   ifdef GATHERSTATS
                    123:        GC_mem_found += n_words_found;
                    124: #   endif
                    125:     return(list);
                    126: }
                    127:
                    128: #ifndef SMALL_CONFIG
                    129:
                    130: /*
                    131:  * A special case for 2 word composite objects (e.g. cons cells):
                    132:  */
                    133: /*ARGSUSED*/
                    134: ptr_t GC_reclaim_clear2(hbp, hhdr, list, abort_if_found)
                    135: register struct hblk *hbp;     /* ptr to current heap block            */
                    136: hdr * hhdr;
                    137: GC_bool abort_if_found;                /* Abort if a reclaimable object is found */
                    138: register ptr_t list;
                    139: {
                    140:     register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
                    141:     register word *p, *plim;
                    142: #   ifdef GATHERSTATS
                    143:         register int n_words_found = 0;
                    144: #   endif
                    145:     register word mark_word;
                    146:     register int i;
                    147: #   define DO_OBJ(start_displ) \
                    148:        if (!(mark_word & ((word)1 << start_displ))) { \
                    149:            FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
                    150:            p[start_displ] = (word)list; \
                    151:            list = (ptr_t)(p+start_displ); \
                    152:            p[start_displ+1] = 0; \
                    153:            INCR_WORDS(2); \
                    154:        }
                    155:
                    156:     p = (word *)(hbp->hb_body);
                    157:     plim = (word *)(((word)hbp) + HBLKSIZE);
                    158:
                    159:     /* go through all words in block */
                    160:        while( p < plim )  {
                    161:            mark_word = *mark_word_addr++;
                    162:            for (i = 0; i < WORDSZ; i += 8) {
                    163:                DO_OBJ(0);
                    164:                DO_OBJ(2);
                    165:                DO_OBJ(4);
                    166:                DO_OBJ(6);
                    167:                p += 8;
                    168:                mark_word >>= 8;
                    169:            }
                    170:        }
                    171: #   ifdef GATHERSTATS
                    172:        GC_mem_found += n_words_found;
                    173: #   endif
                    174:     return(list);
                    175: #   undef DO_OBJ
                    176: }
                    177:
                    178: /*
                    179:  * Another special case for 4 word composite objects:
                    180:  */
                    181: /*ARGSUSED*/
                    182: ptr_t GC_reclaim_clear4(hbp, hhdr, list, abort_if_found)
                    183: register struct hblk *hbp;     /* ptr to current heap block            */
                    184: hdr * hhdr;
                    185: GC_bool abort_if_found;                /* Abort if a reclaimable object is found */
                    186: register ptr_t list;
                    187: {
                    188:     register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
                    189:     register word *p, *plim;
                    190: #   ifdef GATHERSTATS
                    191:         register int n_words_found = 0;
                    192: #   endif
                    193:     register word mark_word;
                    194: #   define DO_OBJ(start_displ) \
                    195:        if (!(mark_word & ((word)1 << start_displ))) { \
                    196:            FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
                    197:            p[start_displ] = (word)list; \
                    198:            list = (ptr_t)(p+start_displ); \
                    199:            p[start_displ+1] = 0; \
                    200:            p[start_displ+2] = 0; \
                    201:            p[start_displ+3] = 0; \
                    202:            INCR_WORDS(4); \
                    203:        }
                    204:
                    205:     p = (word *)(hbp->hb_body);
                    206:     plim = (word *)(((word)hbp) + HBLKSIZE);
                    207:
                    208:     /* go through all words in block */
                    209:        while( p < plim )  {
                    210:            mark_word = *mark_word_addr++;
                    211:            DO_OBJ(0);
                    212:            DO_OBJ(4);
                    213:            DO_OBJ(8);
                    214:            DO_OBJ(12);
                    215:            DO_OBJ(16);
                    216:            DO_OBJ(20);
                    217:            DO_OBJ(24);
                    218:            DO_OBJ(28);
                    219: #          if CPP_WORDSZ == 64
                    220:              DO_OBJ(32);
                    221:              DO_OBJ(36);
                    222:              DO_OBJ(40);
                    223:              DO_OBJ(44);
                    224:              DO_OBJ(48);
                    225:              DO_OBJ(52);
                    226:              DO_OBJ(56);
                    227:              DO_OBJ(60);
                    228: #          endif
                    229:            p += WORDSZ;
                    230:        }
                    231: #   ifdef GATHERSTATS
                    232:        GC_mem_found += n_words_found;
                    233: #   endif
                    234:     return(list);
                    235: #   undef DO_OBJ
                    236: }
                    237:
                    238: #endif /* !SMALL_CONFIG */
                    239:
                    240: /* The same thing, but don't clear objects: */
                    241: /*ARGSUSED*/
                    242: ptr_t GC_reclaim_uninit(hbp, hhdr, sz, list, abort_if_found)
                    243: register struct hblk *hbp;     /* ptr to current heap block            */
                    244: register hdr * hhdr;
                    245: GC_bool abort_if_found;                /* Abort if a reclaimable object is found */
                    246: register ptr_t list;
                    247: register word sz;
                    248: {
                    249:     register int word_no;
                    250:     register word *p, *plim;
                    251: #   ifdef GATHERSTATS
                    252:         register int n_words_found = 0;
                    253: #   endif
                    254:
                    255:     p = (word *)(hbp->hb_body);
                    256:     word_no = HDR_WORDS;
                    257:     plim = (word *)((((word)hbp) + HBLKSIZE)
                    258:                   - WORDS_TO_BYTES(sz));
                    259:
                    260:     /* go through all words in block */
                    261:        while( p <= plim )  {
                    262:            if( !mark_bit_from_hdr(hhdr, word_no) ) {
                    263:                FOUND_FREE(hbp, word_no);
                    264:                INCR_WORDS(sz);
                    265:                /* object is available - put on list */
                    266:                    obj_link(p) = list;
                    267:                    list = ((ptr_t)p);
                    268:            }
                    269:            p += sz;
                    270:            word_no += sz;
                    271:        }
                    272: #   ifdef GATHERSTATS
                    273:        GC_mem_found += n_words_found;
                    274: #   endif
                    275:     return(list);
                    276: }
                    277:
                    278: #ifndef SMALL_CONFIG
                    279: /*
                    280:  * Another special case for 2 word atomic objects:
                    281:  */
                    282: /*ARGSUSED*/
                    283: ptr_t GC_reclaim_uninit2(hbp, hhdr, list, abort_if_found)
                    284: register struct hblk *hbp;     /* ptr to current heap block            */
                    285: hdr * hhdr;
                    286: GC_bool abort_if_found;                /* Abort if a reclaimable object is found */
                    287: register ptr_t list;
                    288: {
                    289:     register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
                    290:     register word *p, *plim;
                    291: #   ifdef GATHERSTATS
                    292:         register int n_words_found = 0;
                    293: #   endif
                    294:     register word mark_word;
                    295:     register int i;
                    296: #   define DO_OBJ(start_displ) \
                    297:        if (!(mark_word & ((word)1 << start_displ))) { \
                    298:            FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
                    299:            p[start_displ] = (word)list; \
                    300:            list = (ptr_t)(p+start_displ); \
                    301:            INCR_WORDS(2); \
                    302:        }
                    303:
                    304:     p = (word *)(hbp->hb_body);
                    305:     plim = (word *)(((word)hbp) + HBLKSIZE);
                    306:
                    307:     /* go through all words in block */
                    308:        while( p < plim )  {
                    309:            mark_word = *mark_word_addr++;
                    310:            for (i = 0; i < WORDSZ; i += 8) {
                    311:                DO_OBJ(0);
                    312:                DO_OBJ(2);
                    313:                DO_OBJ(4);
                    314:                DO_OBJ(6);
                    315:                p += 8;
                    316:                mark_word >>= 8;
                    317:            }
                    318:        }
                    319: #   ifdef GATHERSTATS
                    320:        GC_mem_found += n_words_found;
                    321: #   endif
                    322:     return(list);
                    323: #   undef DO_OBJ
                    324: }
                    325:
                    326: /*
                    327:  * Another special case for 4 word atomic objects:
                    328:  */
                    329: /*ARGSUSED*/
                    330: ptr_t GC_reclaim_uninit4(hbp, hhdr, list, abort_if_found)
                    331: register struct hblk *hbp;     /* ptr to current heap block            */
                    332: hdr * hhdr;
                    333: GC_bool abort_if_found;                /* Abort if a reclaimable object is found */
                    334: register ptr_t list;
                    335: {
                    336:     register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
                    337:     register word *p, *plim;
                    338: #   ifdef GATHERSTATS
                    339:         register int n_words_found = 0;
                    340: #   endif
                    341:     register word mark_word;
                    342: #   define DO_OBJ(start_displ) \
                    343:        if (!(mark_word & ((word)1 << start_displ))) { \
                    344:            FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
                    345:            p[start_displ] = (word)list; \
                    346:            list = (ptr_t)(p+start_displ); \
                    347:            INCR_WORDS(4); \
                    348:        }
                    349:
                    350:     p = (word *)(hbp->hb_body);
                    351:     plim = (word *)(((word)hbp) + HBLKSIZE);
                    352:
                    353:     /* go through all words in block */
                    354:        while( p < plim )  {
                    355:            mark_word = *mark_word_addr++;
                    356:            DO_OBJ(0);
                    357:            DO_OBJ(4);
                    358:            DO_OBJ(8);
                    359:            DO_OBJ(12);
                    360:            DO_OBJ(16);
                    361:            DO_OBJ(20);
                    362:            DO_OBJ(24);
                    363:            DO_OBJ(28);
                    364: #          if CPP_WORDSZ == 64
                    365:              DO_OBJ(32);
                    366:              DO_OBJ(36);
                    367:              DO_OBJ(40);
                    368:              DO_OBJ(44);
                    369:              DO_OBJ(48);
                    370:              DO_OBJ(52);
                    371:              DO_OBJ(56);
                    372:              DO_OBJ(60);
                    373: #          endif
                    374:            p += WORDSZ;
                    375:        }
                    376: #   ifdef GATHERSTATS
                    377:        GC_mem_found += n_words_found;
                    378: #   endif
                    379:     return(list);
                    380: #   undef DO_OBJ
                    381: }
                    382:
                    383: /* Finally the one word case, which never requires any clearing: */
                    384: /*ARGSUSED*/
                    385: ptr_t GC_reclaim1(hbp, hhdr, list, abort_if_found)
                    386: register struct hblk *hbp;     /* ptr to current heap block            */
                    387: hdr * hhdr;
                    388: GC_bool abort_if_found;                /* Abort if a reclaimable object is found */
                    389: register ptr_t list;
                    390: {
                    391:     register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
                    392:     register word *p, *plim;
                    393: #   ifdef GATHERSTATS
                    394:         register int n_words_found = 0;
                    395: #   endif
                    396:     register word mark_word;
                    397:     register int i;
                    398: #   define DO_OBJ(start_displ) \
                    399:        if (!(mark_word & ((word)1 << start_displ))) { \
                    400:            FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
                    401:            p[start_displ] = (word)list; \
                    402:            list = (ptr_t)(p+start_displ); \
                    403:            INCR_WORDS(1); \
                    404:        }
                    405:
                    406:     p = (word *)(hbp->hb_body);
                    407:     plim = (word *)(((word)hbp) + HBLKSIZE);
                    408:
                    409:     /* go through all words in block */
                    410:        while( p < plim )  {
                    411:            mark_word = *mark_word_addr++;
                    412:            for (i = 0; i < WORDSZ; i += 4) {
                    413:                DO_OBJ(0);
                    414:                DO_OBJ(1);
                    415:                DO_OBJ(2);
                    416:                DO_OBJ(3);
                    417:                p += 4;
                    418:                mark_word >>= 4;
                    419:            }
                    420:        }
                    421: #   ifdef GATHERSTATS
                    422:        GC_mem_found += n_words_found;
                    423: #   endif
                    424:     return(list);
                    425: #   undef DO_OBJ
                    426: }
                    427:
                    428: #endif /* !SMALL_CONFIG */
                    429:
                    430: /*
                    431:  * Restore unmarked small objects in the block pointed to by hbp
                    432:  * to the appropriate object free list.
                    433:  * If entirely empty blocks are to be completely deallocated, then
                    434:  * caller should perform that check.
                    435:  */
                    436: void GC_reclaim_small_nonempty_block(hbp, abort_if_found)
                    437: register struct hblk *hbp;     /* ptr to current heap block            */
                    438: int abort_if_found;            /* Abort if a reclaimable object is found */
                    439: {
                    440:     hdr * hhdr;
                    441:     register word sz;          /* size of objects in current block     */
                    442:     register struct obj_kind * ok;
                    443:     register ptr_t * flh;
                    444:     register int kind;
                    445:
                    446:     hhdr = HDR(hbp);
                    447:     sz = hhdr -> hb_sz;
                    448:     hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
                    449:     kind = hhdr -> hb_obj_kind;
                    450:     ok = &GC_obj_kinds[kind];
                    451:     flh = &(ok -> ok_freelist[sz]);
                    452:     GC_write_hint(hbp);
                    453:
                    454:     if (ok -> ok_init) {
                    455:       switch(sz) {
                    456: #      ifndef SMALL_CONFIG
                    457:         case 1:
                    458:             *flh = GC_reclaim1(hbp, hhdr, *flh, abort_if_found);
                    459:             break;
                    460:         case 2:
                    461:             *flh = GC_reclaim_clear2(hbp, hhdr, *flh, abort_if_found);
                    462:             break;
                    463:         case 4:
                    464:             *flh = GC_reclaim_clear4(hbp, hhdr, *flh, abort_if_found);
                    465:             break;
                    466: #      endif
                    467:         default:
                    468:             *flh = GC_reclaim_clear(hbp, hhdr, sz, *flh, abort_if_found);
                    469:             break;
                    470:       }
                    471:     } else {
                    472:       switch(sz) {
                    473: #      ifndef SMALL_CONFIG
                    474:         case 1:
                    475:             *flh = GC_reclaim1(hbp, hhdr, *flh, abort_if_found);
                    476:             break;
                    477:         case 2:
                    478:             *flh = GC_reclaim_uninit2(hbp, hhdr, *flh, abort_if_found);
                    479:             break;
                    480:         case 4:
                    481:             *flh = GC_reclaim_uninit4(hbp, hhdr, *flh, abort_if_found);
                    482:             break;
                    483: #      endif
                    484:         default:
                    485:             *flh = GC_reclaim_uninit(hbp, hhdr, sz, *flh, abort_if_found);
                    486:             break;
                    487:       }
                    488:     }
                    489:     if (IS_UNCOLLECTABLE(kind)) GC_set_hdr_marks(hhdr);
                    490: }
                    491:
                    492: /*
                    493:  * Restore an unmarked large object or an entirely empty blocks of small objects
                    494:  * to the heap block free list.
                    495:  * Otherwise enqueue the block for later processing
                    496:  * by GC_reclaim_small_nonempty_block.
                    497:  * If abort_if_found is TRUE, then process any block immediately.
                    498:  */
                    499: void GC_reclaim_block(hbp, abort_if_found)
                    500: register struct hblk *hbp;     /* ptr to current heap block            */
                    501: word abort_if_found;           /* Abort if a reclaimable object is found */
                    502: {
                    503:     register hdr * hhdr;
                    504:     register word sz;          /* size of objects in current block     */
                    505:     register struct obj_kind * ok;
                    506:     struct hblk ** rlh;
                    507:
                    508:     hhdr = HDR(hbp);
                    509:     sz = hhdr -> hb_sz;
                    510:     ok = &GC_obj_kinds[hhdr -> hb_obj_kind];
                    511:
                    512:     if( sz > MAXOBJSZ ) {  /* 1 big object */
                    513:         if( !mark_bit_from_hdr(hhdr, HDR_WORDS) ) {
                    514:            FOUND_FREE(hbp, HDR_WORDS);
                    515: #          ifdef GATHERSTATS
                    516:                GC_mem_found += sz;
                    517: #          endif
                    518:            GC_freehblk(hbp);
                    519:        }
                    520:     } else {
                    521:         GC_bool empty = GC_block_empty(hhdr);
                    522:         if (abort_if_found) {
                    523:          GC_reclaim_small_nonempty_block(hbp, (int)abort_if_found);
                    524:         } else if (empty) {
                    525: #        ifdef GATHERSTATS
                    526:             GC_mem_found += BYTES_TO_WORDS(HBLKSIZE);
                    527: #        endif
                    528:           GC_freehblk(hbp);
                    529:         } else {
                    530:           /* group of smaller objects, enqueue the real work */
                    531:           rlh = &(ok -> ok_reclaim_list[sz]);
                    532:           hhdr -> hb_next = *rlh;
                    533:           *rlh = hbp;
                    534:         }
                    535:     }
                    536: }
                    537:
                    538: #if !defined(NO_DEBUGGING)
                    539: /* Routines to gather and print heap block info        */
                    540: /* intended for debugging.  Otherwise should be called */
                    541: /* with lock.                                          */
                    542: static size_t number_of_blocks;
                    543: static size_t total_bytes;
                    544:
                    545: /* Number of set bits in a word.  Not performance critical.    */
                    546: static int set_bits(n)
                    547: word n;
                    548: {
                    549:     register word m = n;
                    550:     register int result = 0;
                    551:
                    552:     while (m > 0) {
                    553:        if (m & 1) result++;
                    554:        m >>= 1;
                    555:     }
                    556:     return(result);
                    557: }
                    558:
                    559: /* Return the number of set mark bits in the given header      */
                    560: int GC_n_set_marks(hhdr)
                    561: hdr * hhdr;
                    562: {
                    563:     register int result = 0;
                    564:     register int i;
                    565:
                    566:     for (i = 0; i < MARK_BITS_SZ; i++) {
                    567:         result += set_bits(hhdr -> hb_marks[i]);
                    568:     }
                    569:     return(result);
                    570: }
                    571:
                    572: /*ARGSUSED*/
                    573: void GC_print_block_descr(h, dummy)
                    574: struct hblk *h;
                    575: word dummy;
                    576: {
                    577:     register hdr * hhdr = HDR(h);
                    578:     register size_t bytes = WORDS_TO_BYTES(hhdr -> hb_sz);
                    579:
                    580:     GC_printf3("(%lu:%lu,%lu)", (unsigned long)(hhdr -> hb_obj_kind),
                    581:                                (unsigned long)bytes,
                    582:                                (unsigned long)(GC_n_set_marks(hhdr)));
                    583:     bytes += HDR_BYTES + HBLKSIZE-1;
                    584:     bytes &= ~(HBLKSIZE-1);
                    585:     total_bytes += bytes;
                    586:     number_of_blocks++;
                    587: }
                    588:
                    589: void GC_print_block_list()
                    590: {
                    591:     GC_printf0("(kind(0=ptrfree,1=normal,2=unc.,3=stubborn):size_in_bytes, #_marks_set)\n");
                    592:     number_of_blocks = 0;
                    593:     total_bytes = 0;
                    594:     GC_apply_to_all_blocks(GC_print_block_descr, (word)0);
                    595:     GC_printf2("\nblocks = %lu, bytes = %lu\n",
                    596:               (unsigned long)number_of_blocks,
                    597:               (unsigned long)total_bytes);
                    598: }
                    599:
                    600: #endif /* NO_DEBUGGING */
                    601:
                    602: /*
                    603:  * Do the same thing on the entire heap, after first clearing small object
                    604:  * free lists (if we are not just looking for leaks).
                    605:  */
                    606: void GC_start_reclaim(abort_if_found)
                    607: int abort_if_found;            /* Abort if a GC_reclaimable object is found */
                    608: {
                    609:     int kind;
                    610:
                    611:     /* Clear reclaim- and free-lists */
                    612:       for (kind = 0; kind < GC_n_kinds; kind++) {
                    613:         register ptr_t *fop;
                    614:         register ptr_t *lim;
                    615:         register struct hblk ** rlp;
                    616:         register struct hblk ** rlim;
                    617:         register struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
                    618:
                    619:         if (rlist == 0) continue;      /* This kind not used.  */
                    620:         if (!abort_if_found) {
                    621:             lim = &(GC_obj_kinds[kind].ok_freelist[MAXOBJSZ+1]);
                    622:            for( fop = GC_obj_kinds[kind].ok_freelist; fop < lim; fop++ ) {
                    623:              *fop = 0;
                    624:            }
                    625:        } /* otherwise free list objects are marked,    */
                    626:          /* and its safe to leave them                 */
                    627:        rlim = rlist + MAXOBJSZ+1;
                    628:        for( rlp = rlist; rlp < rlim; rlp++ ) {
                    629:            *rlp = 0;
                    630:        }
                    631:       }
                    632:
                    633: #   ifdef PRINTBLOCKS
                    634:         GC_printf0("GC_reclaim: current block sizes:\n");
                    635:         GC_print_block_list();
                    636: #   endif
                    637:
                    638:   /* Go through all heap blocks (in hblklist) and reclaim unmarked objects */
                    639:   /* or enqueue the block for later processing.                                   */
                    640:     GC_apply_to_all_blocks(GC_reclaim_block, (word)abort_if_found);
                    641:
                    642: }
                    643:
                    644: /*
                    645:  * Sweep blocks of the indicated object size and kind until either the
                    646:  * appropriate free list is nonempty, or there are no more blocks to
                    647:  * sweep.
                    648:  */
                    649: void GC_continue_reclaim(sz, kind)
                    650: word sz;       /* words */
                    651: int kind;
                    652: {
                    653:     register hdr * hhdr;
                    654:     register struct hblk * hbp;
                    655:     register struct obj_kind * ok = &(GC_obj_kinds[kind]);
                    656:     struct hblk ** rlh = ok -> ok_reclaim_list;
                    657:     ptr_t *flh = &(ok -> ok_freelist[sz]);
                    658:
                    659:     if (rlh == 0) return;      /* No blocks of this kind.      */
                    660:     rlh += sz;
                    661:     while ((hbp = *rlh) != 0) {
                    662:         hhdr = HDR(hbp);
                    663:         *rlh = hhdr -> hb_next;
                    664:         GC_reclaim_small_nonempty_block(hbp, FALSE);
                    665:         if (*flh != 0) break;
                    666:     }
                    667: }
                    668:
                    669: /*
                    670:  * Reclaim all small blocks waiting to be reclaimed.
                    671:  * Abort and return FALSE when/if (*stop_func)() returns TRUE.
                    672:  * If this returns TRUE, then it's safe to restart the world
                    673:  * with incorrectly cleared mark bits.
                    674:  * If ignore_old is TRUE, then reclain only blocks that have been
                    675:  * recently reclaimed, and discard the rest.
                    676:  * Stop_func may be 0.
                    677:  */
                    678: GC_bool GC_reclaim_all(stop_func, ignore_old)
                    679: GC_stop_func stop_func;
                    680: GC_bool ignore_old;
                    681: {
                    682:     register word sz;
                    683:     register int kind;
                    684:     register hdr * hhdr;
                    685:     register struct hblk * hbp;
                    686:     register struct obj_kind * ok;
                    687:     struct hblk ** rlp;
                    688:     struct hblk ** rlh;
                    689: #   ifdef PRINTTIMES
                    690:        CLOCK_TYPE start_time;
                    691:        CLOCK_TYPE done_time;
                    692:
                    693:        GET_TIME(start_time);
                    694: #   endif
                    695:
                    696:     for (kind = 0; kind < GC_n_kinds; kind++) {
                    697:        ok = &(GC_obj_kinds[kind]);
                    698:        rlp = ok -> ok_reclaim_list;
                    699:        if (rlp == 0) continue;
                    700:        for (sz = 1; sz <= MAXOBJSZ; sz++) {
                    701:            rlh = rlp + sz;
                    702:            while ((hbp = *rlh) != 0) {
                    703:                if (stop_func != (GC_stop_func)0 && (*stop_func)()) {
                    704:                    return(FALSE);
                    705:                }
                    706:                hhdr = HDR(hbp);
                    707:                *rlh = hhdr -> hb_next;
                    708:                if (!ignore_old || hhdr -> hb_last_reclaimed == GC_gc_no - 1) {
                    709:                    /* It's likely we'll need it this time, too */
                    710:                    /* It's been touched recently, so this      */
                    711:                    /* shouldn't trigger paging.                */
                    712:                    GC_reclaim_small_nonempty_block(hbp, FALSE);
                    713:                }
                    714:             }
                    715:         }
                    716:     }
                    717: #   ifdef PRINTTIMES
                    718:        GET_TIME(done_time);
                    719:        GC_printf1("Disposing of reclaim lists took %lu msecs\n",
                    720:                   MS_TIME_DIFF(done_time,start_time));
                    721: #   endif
                    722:     return(TRUE);
                    723: }

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