Annotation of OpenXM_contrib2/asir2000/gc5.3/gc_priv.h, Revision 1.1
1.1 ! noro 1: /*
! 2: * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
! 3: * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
! 4: * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
! 5: * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
! 6: *
! 7: *
! 8: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
! 9: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
! 10: *
! 11: * Permission is hereby granted to use or copy this program
! 12: * for any purpose, provided the above notices are retained on all copies.
! 13: * Permission to modify the code and to distribute modified code is granted,
! 14: * provided the above notices are retained, and a notice that the code was
! 15: * modified is included with the above copyright notice.
! 16: */
! 17: /* Boehm, February 16, 1996 2:30 pm PST */
! 18:
! 19:
! 20: # ifndef GC_PRIVATE_H
! 21: # define GC_PRIVATE_H
! 22:
! 23: #if defined(mips) && defined(SYSTYPE_BSD) && defined(sony_news)
! 24: /* sony RISC NEWS, NEWSOS 4 */
! 25: # define BSD_TIME
! 26: /* typedef long ptrdiff_t; -- necessary on some really old systems */
! 27: #endif
! 28:
! 29: #if defined(mips) && defined(SYSTYPE_BSD43)
! 30: /* MIPS RISCOS 4 */
! 31: # define BSD_TIME
! 32: #endif
! 33:
! 34: #ifdef BSD_TIME
! 35: # include <sys/types.h>
! 36: # include <sys/time.h>
! 37: # include <sys/resource.h>
! 38: #endif /* BSD_TIME */
! 39:
! 40: # ifndef GC_H
! 41: # include "gc.h"
! 42: # endif
! 43:
! 44: typedef GC_word word;
! 45: typedef GC_signed_word signed_word;
! 46:
! 47: # ifndef GCCONFIG_H
! 48: # include "gcconfig.h"
! 49: # endif
! 50:
! 51: # ifndef HEADERS_H
! 52: # include "gc_hdrs.h"
! 53: # endif
! 54:
! 55: typedef int GC_bool;
! 56: # define TRUE 1
! 57: # define FALSE 0
! 58:
! 59: typedef char * ptr_t; /* A generic pointer to which we can add */
! 60: /* byte displacements. */
! 61: /* Preferably identical to caddr_t, if it */
! 62: /* exists. */
! 63:
! 64: #if defined(__STDC__)
! 65: # include <stdlib.h>
! 66: # if !(defined( sony_news ) )
! 67: # include <stddef.h>
! 68: # endif
! 69: # define VOLATILE volatile
! 70: #else
! 71: # ifdef MSWIN32
! 72: # include <stdlib.h>
! 73: # endif
! 74: # define VOLATILE
! 75: #endif
! 76:
! 77: #define CONST GC_CONST
! 78:
! 79: #if 0 /* was once defined for AMIGA */
! 80: # define GC_FAR __far
! 81: #else
! 82: # define GC_FAR
! 83: #endif
! 84:
! 85:
! 86: /*********************************/
! 87: /* */
! 88: /* Definitions for conservative */
! 89: /* collector */
! 90: /* */
! 91: /*********************************/
! 92:
! 93: /*********************************/
! 94: /* */
! 95: /* Easily changeable parameters */
! 96: /* */
! 97: /*********************************/
! 98:
! 99: #define STUBBORN_ALLOC /* Define stubborn allocation primitives */
! 100: #if defined(SRC_M3) || defined(SMALL_CONFIG)
! 101: # undef STUBBORN_ALLOC
! 102: #endif
! 103:
! 104:
! 105: /* #define ALL_INTERIOR_POINTERS */
! 106: /* Forces all pointers into the interior of an */
! 107: /* object to be considered valid. Also causes the */
! 108: /* sizes of all objects to be inflated by at least */
! 109: /* one byte. This should suffice to guarantee */
! 110: /* that in the presence of a compiler that does */
! 111: /* not perform garbage-collector-unsafe */
! 112: /* optimizations, all portable, strictly ANSI */
! 113: /* conforming C programs should be safely usable */
! 114: /* with malloc replaced by GC_malloc and free */
! 115: /* calls removed. There are several disadvantages: */
! 116: /* 1. There are probably no interesting, portable, */
! 117: /* strictly ANSI conforming C programs. */
! 118: /* 2. This option makes it hard for the collector */
! 119: /* to allocate space that is not ``pointed to'' */
! 120: /* by integers, etc. Under SunOS 4.X with a */
! 121: /* statically linked libc, we empiricaly */
! 122: /* observed that it would be difficult to */
! 123: /* allocate individual objects larger than 100K. */
! 124: /* Even if only smaller objects are allocated, */
! 125: /* more swap space is likely to be needed. */
! 126: /* Fortunately, much of this will never be */
! 127: /* touched. */
! 128: /* If you can easily avoid using this option, do. */
! 129: /* If not, try to keep individual objects small. */
! 130:
! 131: #define PRINTSTATS /* Print garbage collection statistics */
! 132: /* For less verbose output, undefine in reclaim.c */
! 133:
! 134: #define PRINTTIMES /* Print the amount of time consumed by each garbage */
! 135: /* collection. */
! 136:
! 137: #define PRINTBLOCKS /* Print object sizes associated with heap blocks, */
! 138: /* whether the objects are atomic or composite, and */
! 139: /* whether or not the block was found to be empty */
! 140: /* during the reclaim phase. Typically generates */
! 141: /* about one screenful per garbage collection. */
! 142: #undef PRINTBLOCKS
! 143:
! 144: #ifdef SILENT
! 145: # ifdef PRINTSTATS
! 146: # undef PRINTSTATS
! 147: # endif
! 148: # ifdef PRINTTIMES
! 149: # undef PRINTTIMES
! 150: # endif
! 151: # ifdef PRINTNBLOCKS
! 152: # undef PRINTNBLOCKS
! 153: # endif
! 154: #endif
! 155:
! 156: #if defined(PRINTSTATS) && !defined(GATHERSTATS)
! 157: # define GATHERSTATS
! 158: #endif
! 159:
! 160: #ifdef FINALIZE_ON_DEMAND
! 161: # define GC_INVOKE_FINALIZERS()
! 162: #else
! 163: # define GC_INVOKE_FINALIZERS() (void)GC_invoke_finalizers()
! 164: #endif
! 165:
! 166: #define MERGE_SIZES /* Round up some object sizes, so that fewer distinct */
! 167: /* free lists are actually maintained. This applies */
! 168: /* only to the top level routines in misc.c, not to */
! 169: /* user generated code that calls GC_allocobj and */
! 170: /* GC_allocaobj directly. */
! 171: /* Slows down average programs slightly. May however */
! 172: /* substantially reduce fragmentation if allocation */
! 173: /* request sizes are widely scattered. */
! 174: /* May save significant amounts of space for obj_map */
! 175: /* entries. */
! 176:
! 177: /* ALIGN_DOUBLE requires MERGE_SIZES at present. */
! 178: # if defined(ALIGN_DOUBLE) && !defined(MERGE_SIZES)
! 179: # define MERGE_SIZES
! 180: # endif
! 181:
! 182: #if defined(ALL_INTERIOR_POINTERS) && !defined(DONT_ADD_BYTE_AT_END)
! 183: # define ADD_BYTE_AT_END
! 184: #endif
! 185:
! 186:
! 187: # ifndef LARGE_CONFIG
! 188: # define MINHINCR 16 /* Minimum heap increment, in blocks of HBLKSIZE */
! 189: /* Must be multiple of largest page size. */
! 190: # define MAXHINCR 512 /* Maximum heap increment, in blocks */
! 191: # else
! 192: # define MINHINCR 64
! 193: # define MAXHINCR 4096
! 194: # endif
! 195:
! 196: # define TIME_LIMIT 50 /* We try to keep pause times from exceeding */
! 197: /* this by much. In milliseconds. */
! 198:
! 199: # define BL_LIMIT GC_black_list_spacing
! 200: /* If we need a block of N bytes, and we have */
! 201: /* a block of N + BL_LIMIT bytes available, */
! 202: /* and N > BL_LIMIT, */
! 203: /* but all possible positions in it are */
! 204: /* blacklisted, we just use it anyway (and */
! 205: /* print a warning, if warnings are enabled). */
! 206: /* This risks subsequently leaking the block */
! 207: /* due to a false reference. But not using */
! 208: /* the block risks unreasonable immediate */
! 209: /* heap growth. */
! 210:
! 211: /*********************************/
! 212: /* */
! 213: /* Stack saving for debugging */
! 214: /* */
! 215: /*********************************/
! 216:
! 217: #ifdef SAVE_CALL_CHAIN
! 218:
! 219: /*
! 220: * Number of frames and arguments to save in objects allocated by
! 221: * debugging allocator.
! 222: */
! 223: # define NFRAMES 6 /* Number of frames to save. Even for */
! 224: /* alignment reasons. */
! 225: # define NARGS 2 /* Mumber of arguments to save for each call. */
! 226:
! 227: # define NEED_CALLINFO
! 228:
! 229: /* Fill in the pc and argument information for up to NFRAMES of my */
! 230: /* callers. Ignore my frame and my callers frame. */
! 231: void GC_save_callers (/* struct callinfo info[NFRAMES] */);
! 232:
! 233: void GC_print_callers (/* struct callinfo info[NFRAMES] */);
! 234:
! 235: #else
! 236:
! 237: # ifdef GC_ADD_CALLER
! 238: # define NFRAMES 1
! 239: # define NARGS 0
! 240: # define NEED_CALLINFO
! 241: # endif
! 242:
! 243: #endif
! 244:
! 245: #ifdef NEED_CALLINFO
! 246: struct callinfo {
! 247: word ci_pc;
! 248: # if NARGS > 0
! 249: word ci_arg[NARGS]; /* bit-wise complement to avoid retention */
! 250: # endif
! 251: # if defined(ALIGN_DOUBLE) && (NFRAMES * (NARGS + 1)) % 2 == 1
! 252: /* Likely alignment problem. */
! 253: word ci_dummy;
! 254: # endif
! 255: };
! 256: #endif
! 257:
! 258:
! 259: /*********************************/
! 260: /* */
! 261: /* OS interface routines */
! 262: /* */
! 263: /*********************************/
! 264:
! 265: #ifdef BSD_TIME
! 266: # undef CLOCK_TYPE
! 267: # undef GET_TIME
! 268: # undef MS_TIME_DIFF
! 269: # define CLOCK_TYPE struct timeval
! 270: # define GET_TIME(x) { struct rusage rusage; \
! 271: getrusage (RUSAGE_SELF, &rusage); \
! 272: x = rusage.ru_utime; }
! 273: # define MS_TIME_DIFF(a,b) ((double) (a.tv_sec - b.tv_sec) * 1000.0 \
! 274: + (double) (a.tv_usec - b.tv_usec) / 1000.0)
! 275: #else /* !BSD_TIME */
! 276: # ifdef MSWIN32
! 277: # include <windows.h>
! 278: # include <winbase.h>
! 279: # define CLOCK_TYPE DWORD
! 280: # define GET_TIME(x) x = GetTickCount()
! 281: # define MS_TIME_DIFF(a,b) ((long)((a)-(b)))
! 282: # else /* !MSWIN32, !BSD_TIME */
! 283: # include <time.h>
! 284: # if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4)
! 285: clock_t clock(); /* Not in time.h, where it belongs */
! 286: # endif
! 287: # if defined(FREEBSD) && !defined(CLOCKS_PER_SEC)
! 288: # include <machine/limits.h>
! 289: # define CLOCKS_PER_SEC CLK_TCK
! 290: # endif
! 291: # if !defined(CLOCKS_PER_SEC)
! 292: # define CLOCKS_PER_SEC 1000000
! 293: /*
! 294: * This is technically a bug in the implementation. ANSI requires that
! 295: * CLOCKS_PER_SEC be defined. But at least under SunOS4.1.1, it isn't.
! 296: * Also note that the combination of ANSI C and POSIX is incredibly gross
! 297: * here. The type clock_t is used by both clock() and times(). But on
! 298: * some machines these use different notions of a clock tick, CLOCKS_PER_SEC
! 299: * seems to apply only to clock. Hence we use it here. On many machines,
! 300: * including SunOS, clock actually uses units of microseconds (which are
! 301: * not really clock ticks).
! 302: */
! 303: # endif
! 304: # define CLOCK_TYPE clock_t
! 305: # define GET_TIME(x) x = clock()
! 306: # define MS_TIME_DIFF(a,b) ((unsigned long) \
! 307: (1000.0*(double)((a)-(b))/(double)CLOCKS_PER_SEC))
! 308: # endif /* !MSWIN32 */
! 309: #endif /* !BSD_TIME */
! 310:
! 311: /* We use bzero and bcopy internally. They may not be available. */
! 312: # if defined(SPARC) && defined(SUNOS4)
! 313: # define BCOPY_EXISTS
! 314: # endif
! 315: # if defined(M68K) && defined(AMIGA)
! 316: # define BCOPY_EXISTS
! 317: # endif
! 318: # if defined(M68K) && defined(NEXT)
! 319: # define BCOPY_EXISTS
! 320: # endif
! 321: # if defined(VAX)
! 322: # define BCOPY_EXISTS
! 323: # endif
! 324: # if defined(AMIGA)
! 325: # include <string.h>
! 326: # define BCOPY_EXISTS
! 327: # endif
! 328:
! 329: # ifndef BCOPY_EXISTS
! 330: # include <string.h>
! 331: # define BCOPY(x,y,n) memcpy(y, x, (size_t)(n))
! 332: # define BZERO(x,n) memset(x, 0, (size_t)(n))
! 333: # else
! 334: # define BCOPY(x,y,n) bcopy((char *)(x),(char *)(y),(int)(n))
! 335: # define BZERO(x,n) bzero((char *)(x),(int)(n))
! 336: # endif
! 337:
! 338: /* HBLKSIZE aligned allocation. 0 is taken to mean failure */
! 339: /* space is assumed to be cleared. */
! 340: /* In the case os USE_MMAP, the argument must also be a */
! 341: /* physical page size. */
! 342: /* GET_MEM is currently not assumed to retrieve 0 filled space, */
! 343: /* though we should perhaps take advantage of the case in which */
! 344: /* does. */
! 345: # ifdef PCR
! 346: char * real_malloc();
! 347: # define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
! 348: + GC_page_size-1)
! 349: # else
! 350: # ifdef OS2
! 351: void * os2_alloc(size_t bytes);
! 352: # define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
! 353: + GC_page_size) \
! 354: + GC_page_size-1)
! 355: # else
! 356: # if defined(AMIGA) || defined(NEXT) || defined(MACOSX) || defined(DOS4GW)
! 357: # define GET_MEM(bytes) HBLKPTR((size_t) \
! 358: calloc(1, (size_t)bytes + GC_page_size) \
! 359: + GC_page_size-1)
! 360: # else
! 361: # ifdef MSWIN32
! 362: extern ptr_t GC_win32_get_mem();
! 363: # define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
! 364: # else
! 365: # ifdef MACOS
! 366: # if defined(USE_TEMPORARY_MEMORY)
! 367: extern Ptr GC_MacTemporaryNewPtr(size_t size,
! 368: Boolean clearMemory);
! 369: # define GET_MEM(bytes) HBLKPTR( \
! 370: GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
! 371: + GC_page_size-1)
! 372: # else
! 373: # define GET_MEM(bytes) HBLKPTR( \
! 374: NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
! 375: # endif
! 376: # else
! 377: extern ptr_t GC_unix_get_mem();
! 378: # define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
! 379: # endif
! 380: # endif
! 381: # endif
! 382: # endif
! 383: # endif
! 384:
! 385: /*
! 386: * Mutual exclusion between allocator/collector routines.
! 387: * Needed if there is more than one allocator thread.
! 388: * FASTLOCK() is assumed to try to acquire the lock in a cheap and
! 389: * dirty way that is acceptable for a few instructions, e.g. by
! 390: * inhibiting preemption. This is assumed to have succeeded only
! 391: * if a subsequent call to FASTLOCK_SUCCEEDED() returns TRUE.
! 392: * FASTUNLOCK() is called whether or not FASTLOCK_SUCCEEDED().
! 393: * If signals cannot be tolerated with the FASTLOCK held, then
! 394: * FASTLOCK should disable signals. The code executed under
! 395: * FASTLOCK is otherwise immune to interruption, provided it is
! 396: * not restarted.
! 397: * DCL_LOCK_STATE declares any local variables needed by LOCK and UNLOCK
! 398: * and/or DISABLE_SIGNALS and ENABLE_SIGNALS and/or FASTLOCK.
! 399: * (There is currently no equivalent for FASTLOCK.)
! 400: */
! 401: # ifdef THREADS
! 402: # ifdef PCR_OBSOLETE /* Faster, but broken with multiple lwp's */
! 403: # include "th/PCR_Th.h"
! 404: # include "th/PCR_ThCrSec.h"
! 405: extern struct PCR_Th_MLRep GC_allocate_ml;
! 406: # define DCL_LOCK_STATE PCR_sigset_t GC_old_sig_mask
! 407: # define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml)
! 408: # define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml)
! 409: # define FASTLOCK() PCR_ThCrSec_EnterSys()
! 410: /* Here we cheat (a lot): */
! 411: # define FASTLOCK_SUCCEEDED() (*(int *)(&GC_allocate_ml) == 0)
! 412: /* TRUE if nobody currently holds the lock */
! 413: # define FASTUNLOCK() PCR_ThCrSec_ExitSys()
! 414: # endif
! 415: # ifdef PCR
! 416: # include <base/PCR_Base.h>
! 417: # include <th/PCR_Th.h>
! 418: extern PCR_Th_ML GC_allocate_ml;
! 419: # define DCL_LOCK_STATE \
! 420: PCR_ERes GC_fastLockRes; PCR_sigset_t GC_old_sig_mask
! 421: # define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml)
! 422: # define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml)
! 423: # define FASTLOCK() (GC_fastLockRes = PCR_Th_ML_Try(&GC_allocate_ml))
! 424: # define FASTLOCK_SUCCEEDED() (GC_fastLockRes == PCR_ERes_okay)
! 425: # define FASTUNLOCK() {\
! 426: if( FASTLOCK_SUCCEEDED() ) PCR_Th_ML_Release(&GC_allocate_ml); }
! 427: # endif
! 428: # ifdef SRC_M3
! 429: extern word RT0u__inCritical;
! 430: # define LOCK() RT0u__inCritical++
! 431: # define UNLOCK() RT0u__inCritical--
! 432: # endif
! 433: # ifdef SOLARIS_THREADS
! 434: # include <thread.h>
! 435: # include <signal.h>
! 436: extern mutex_t GC_allocate_ml;
! 437: # define LOCK() mutex_lock(&GC_allocate_ml);
! 438: # define UNLOCK() mutex_unlock(&GC_allocate_ml);
! 439: # endif
! 440: # if defined(LINUX_THREADS)
! 441: # if defined(I386)|| defined(POWERPC) || defined(ALPHA) || defined(IA64) \
! 442: || defined(M68K)
! 443: # include <pthread.h>
! 444: # define USE_SPIN_LOCK
! 445: # if defined(I386)
! 446: inline static int GC_test_and_set(volatile unsigned int *addr) {
! 447: int oldval;
! 448: /* Note: the "xchg" instruction does not need a "lock" prefix */
! 449: __asm__ __volatile__("xchgl %0, %1"
! 450: : "=r"(oldval), "=m"(*(addr))
! 451: : "0"(1), "m"(*(addr)));
! 452: return oldval;
! 453: }
! 454: # endif
! 455: # if defined(IA64)
! 456: inline static int GC_test_and_set(volatile unsigned int *addr) {
! 457: int oldval;
! 458: __asm__ __volatile__("xchg4 %0=%1,%2"
! 459: : "=r"(oldval), "=m"(*addr)
! 460: : "r"(1), "1"(*addr));
! 461: return oldval;
! 462: }
! 463: inline static void GC_clear(volatile unsigned int *addr) {
! 464: __asm__ __volatile__("st4.rel %0=r0" : "=m" (*addr));
! 465: }
! 466: # define GC_CLEAR_DEFINED
! 467: # endif
! 468: # ifdef M68K
! 469: /* Contributed by Tony Mantler. I'm not sure how well it was */
! 470: /* tested. */
! 471: inline static int GC_test_and_set(volatile unsigned int *addr) {
! 472: char oldval; /* this must be no longer than 8 bits */
! 473:
! 474: /* The return value is semi-phony. */
! 475: /* 'tas' sets bit 7 while the return */
! 476: /* value pretends bit 0 was set */
! 477: __asm__ __volatile__(
! 478: "tas %1@; sne %0; negb %0"
! 479: : "=d" (oldval)
! 480: : "a" (addr));
! 481: return oldval;
! 482: }
! 483: # endif
! 484: # if defined(POWERPC)
! 485: inline static int GC_test_and_set(volatile unsigned int *addr) {
! 486: int oldval;
! 487: int temp = 1; // locked value
! 488:
! 489: __asm__ __volatile__(
! 490: "1:\tlwarx %0,0,%3\n" // load and reserve
! 491: "\tcmpwi %0, 0\n" // if load is
! 492: "\tbne 2f\n" // non-zero, return already set
! 493: "\tstwcx. %2,0,%1\n" // else store conditional
! 494: "\tbne- 1b\n" // retry if lost reservation
! 495: "2:\t\n" // oldval is zero if we set
! 496: : "=&r"(oldval), "=p"(addr)
! 497: : "r"(temp), "1"(addr)
! 498: : "memory");
! 499: return (int)oldval;
! 500: }
! 501: inline static void GC_clear(volatile unsigned int *addr) {
! 502: __asm__ __volatile__("eieio");
! 503: *(addr) = 0;
! 504: }
! 505: # define GC_CLEAR_DEFINED
! 506: # endif
! 507: # ifdef ALPHA
! 508: inline static int GC_test_and_set(volatile unsigned int * addr)
! 509: {
! 510: unsigned long oldvalue;
! 511: unsigned long temp;
! 512:
! 513: __asm__ __volatile__(
! 514: "1: ldl_l %0,%1\n"
! 515: " and %0,%3,%2\n"
! 516: " bne %2,2f\n"
! 517: " xor %0,%3,%0\n"
! 518: " stl_c %0,%1\n"
! 519: " beq %0,3f\n"
! 520: " mb\n"
! 521: "2:\n"
! 522: ".section .text2,\"ax\"\n"
! 523: "3: br 1b\n"
! 524: ".previous"
! 525: :"=&r" (temp), "=m" (*addr), "=&r" (oldvalue)
! 526: :"Ir" (1), "m" (*addr));
! 527:
! 528: return oldvalue;
! 529: }
! 530: /* Should probably also define GC_clear, since it needs */
! 531: /* a memory barrier ?? */
! 532: # endif /* ALPHA */
! 533: # ifdef ARM32
! 534: inline static int GC_test_and_set(volatile unsigned int *addr) {
! 535: int oldval;
! 536: /* SWP on ARM is very similar to XCHG on x86. Doesn't lock the
! 537: * bus because there are no SMP ARM machines. If/when there are,
! 538: * this code will likely need to be updated. */
! 539: /* See linuxthreads/sysdeps/arm/pt-machine.h in glibc-2.1 */
! 540: __asm__ __volatile__("swp %0, %1, [%2]"
! 541: : "=r"(oldval)
! 542: : "r"(1), "r"(addr));
! 543: return oldval;
! 544: }
! 545: # endif
! 546: # ifndef GC_CLEAR_DEFINED
! 547: inline static void GC_clear(volatile unsigned int *addr) {
! 548: /* Try to discourage gcc from moving anything past this. */
! 549: __asm__ __volatile__(" ");
! 550: *(addr) = 0;
! 551: }
! 552: # endif
! 553:
! 554: extern volatile unsigned int GC_allocate_lock;
! 555: extern pthread_t GC_lock_holder;
! 556: extern void GC_lock(void);
! 557: /* Allocation lock holder. Only set if acquired by client through */
! 558: /* GC_call_with_alloc_lock. */
! 559: # define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
! 560: # define NO_THREAD (pthread_t)(-1)
! 561: # define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
! 562: # define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
! 563: # define LOCK() \
! 564: { if (GC_test_and_set(&GC_allocate_lock)) GC_lock(); }
! 565: # define UNLOCK() \
! 566: GC_clear(&GC_allocate_lock)
! 567: extern VOLATILE GC_bool GC_collecting;
! 568: # define ENTER_GC() \
! 569: { \
! 570: GC_collecting = 1; \
! 571: }
! 572: # define EXIT_GC() GC_collecting = 0;
! 573: # else /* LINUX_THREADS on hardware for which we don't know how */
! 574: /* to do test and set. */
! 575: # include <pthread.h>
! 576: extern pthread_mutex_t GC_allocate_ml;
! 577: # define LOCK() pthread_mutex_lock(&GC_allocate_ml)
! 578: # define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
! 579: # endif
! 580: # endif /* LINUX_THREADS */
! 581: # if defined(HPUX_THREADS)
! 582: # include <pthread.h>
! 583: extern pthread_mutex_t GC_allocate_ml;
! 584: # define LOCK() pthread_mutex_lock(&GC_allocate_ml)
! 585: # define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
! 586: # endif
! 587: # if defined(IRIX_THREADS) || defined(IRIX_JDK_THREADS)
! 588: /* This may also eventually be appropriate for HPUX_THREADS */
! 589: # include <pthread.h>
! 590: # ifndef HPUX_THREADS
! 591: /* This probably should never be included, but I can't test */
! 592: /* on Irix anymore. */
! 593: # include <mutex.h>
! 594: # endif
! 595:
! 596: # ifndef HPUX_THREADS
! 597: # if __mips < 3 || !(defined (_ABIN32) || defined(_ABI64)) \
! 598: || !defined(_COMPILER_VERSION) || _COMPILER_VERSION < 700
! 599: # define GC_test_and_set(addr, v) test_and_set(addr,v)
! 600: # else
! 601: # define GC_test_and_set(addr, v) __test_and_set(addr,v)
! 602: # endif
! 603: # else
! 604: /* I couldn't find a way to do this inline on HP/UX */
! 605: # endif
! 606: extern unsigned long GC_allocate_lock;
! 607: /* This is not a mutex because mutexes that obey the (optional) */
! 608: /* POSIX scheduling rules are subject to convoys in high contention */
! 609: /* applications. This is basically a spin lock. */
! 610: extern pthread_t GC_lock_holder;
! 611: extern void GC_lock(void);
! 612: /* Allocation lock holder. Only set if acquired by client through */
! 613: /* GC_call_with_alloc_lock. */
! 614: # define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
! 615: # define NO_THREAD (pthread_t)(-1)
! 616: # define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
! 617: # define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
! 618: # ifdef HPUX_THREADS
! 619: # define LOCK() { if (!GC_test_and_clear(&GC_allocate_lock)) GC_lock(); }
! 620: /* The following is INCORRECT, since the memory model is too weak. */
! 621: # define UNLOCK() { GC_noop1(&GC_allocate_lock); \
! 622: *(volatile unsigned long *)(&GC_allocate_lock) = 1; }
! 623: # else
! 624: # define LOCK() { if (GC_test_and_set(&GC_allocate_lock, 1)) GC_lock(); }
! 625: # if __mips >= 3 && (defined (_ABIN32) || defined(_ABI64)) \
! 626: && defined(_COMPILER_VERSION) && _COMPILER_VERSION >= 700
! 627: # define UNLOCK() __lock_release(&GC_allocate_lock)
! 628: # else
! 629: /* The function call in the following should prevent the */
! 630: /* compiler from moving assignments to below the UNLOCK. */
! 631: /* This is probably not necessary for ucode or gcc 2.8. */
! 632: /* It may be necessary for Ragnarok and future gcc */
! 633: /* versions. */
! 634: # define UNLOCK() { GC_noop1(&GC_allocate_lock); \
! 635: *(volatile unsigned long *)(&GC_allocate_lock) = 0; }
! 636: # endif
! 637: # endif
! 638: extern VOLATILE GC_bool GC_collecting;
! 639: # define ENTER_GC() \
! 640: { \
! 641: GC_collecting = 1; \
! 642: }
! 643: # define EXIT_GC() GC_collecting = 0;
! 644: # endif /* IRIX_THREADS || IRIX_JDK_THREADS */
! 645: # ifdef WIN32_THREADS
! 646: # include <windows.h>
! 647: GC_API CRITICAL_SECTION GC_allocate_ml;
! 648: # define LOCK() EnterCriticalSection(&GC_allocate_ml);
! 649: # define UNLOCK() LeaveCriticalSection(&GC_allocate_ml);
! 650: # endif
! 651: # ifndef SET_LOCK_HOLDER
! 652: # define SET_LOCK_HOLDER()
! 653: # define UNSET_LOCK_HOLDER()
! 654: # define I_HOLD_LOCK() FALSE
! 655: /* Used on platforms were locks can be reacquired, */
! 656: /* so it doesn't matter if we lie. */
! 657: # endif
! 658: # else
! 659: # define LOCK()
! 660: # define UNLOCK()
! 661: # endif
! 662: # ifndef SET_LOCK_HOLDER
! 663: # define SET_LOCK_HOLDER()
! 664: # define UNSET_LOCK_HOLDER()
! 665: # define I_HOLD_LOCK() FALSE
! 666: /* Used on platforms were locks can be reacquired, */
! 667: /* so it doesn't matter if we lie. */
! 668: # endif
! 669: # ifndef ENTER_GC
! 670: # define ENTER_GC()
! 671: # define EXIT_GC()
! 672: # endif
! 673:
! 674: # ifndef DCL_LOCK_STATE
! 675: # define DCL_LOCK_STATE
! 676: # endif
! 677: # ifndef FASTLOCK
! 678: # define FASTLOCK() LOCK()
! 679: # define FASTLOCK_SUCCEEDED() TRUE
! 680: # define FASTUNLOCK() UNLOCK()
! 681: # endif
! 682:
! 683: /* Delay any interrupts or signals that may abort this thread. Data */
! 684: /* structures are in a consistent state outside this pair of calls. */
! 685: /* ANSI C allows both to be empty (though the standard isn't very */
! 686: /* clear on that point). Standard malloc implementations are usually */
! 687: /* neither interruptable nor thread-safe, and thus correspond to */
! 688: /* empty definitions. */
! 689: # ifdef PCR
! 690: # define DISABLE_SIGNALS() \
! 691: PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask)
! 692: # define ENABLE_SIGNALS() \
! 693: PCR_Th_SetSigMask(&GC_old_sig_mask, NIL)
! 694: # else
! 695: # if defined(SRC_M3) || defined(AMIGA) || defined(SOLARIS_THREADS) \
! 696: || defined(MSWIN32) || defined(MACOS) || defined(DJGPP) \
! 697: || defined(NO_SIGNALS) || defined(IRIX_THREADS) \
! 698: || defined(IRIX_JDK_THREADS) || defined(LINUX_THREADS)
! 699: /* Also useful for debugging. */
! 700: /* Should probably use thr_sigsetmask for SOLARIS_THREADS. */
! 701: # define DISABLE_SIGNALS()
! 702: # define ENABLE_SIGNALS()
! 703: # else
! 704: # define DISABLE_SIGNALS() GC_disable_signals()
! 705: void GC_disable_signals();
! 706: # define ENABLE_SIGNALS() GC_enable_signals()
! 707: void GC_enable_signals();
! 708: # endif
! 709: # endif
! 710:
! 711: /*
! 712: * Stop and restart mutator threads.
! 713: */
! 714: # ifdef PCR
! 715: # include "th/PCR_ThCtl.h"
! 716: # define STOP_WORLD() \
! 717: PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_stopNormal, \
! 718: PCR_allSigsBlocked, \
! 719: PCR_waitForever)
! 720: # define START_WORLD() \
! 721: PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_null, \
! 722: PCR_allSigsBlocked, \
! 723: PCR_waitForever);
! 724: # else
! 725: # if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
! 726: || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
! 727: || defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
! 728: void GC_stop_world();
! 729: void GC_start_world();
! 730: # define STOP_WORLD() GC_stop_world()
! 731: # define START_WORLD() GC_start_world()
! 732: # else
! 733: # define STOP_WORLD()
! 734: # define START_WORLD()
! 735: # endif
! 736: # endif
! 737:
! 738: /* Abandon ship */
! 739: # ifdef PCR
! 740: # define ABORT(s) PCR_Base_Panic(s)
! 741: # else
! 742: # ifdef SMALL_CONFIG
! 743: # define ABORT(msg) abort();
! 744: # else
! 745: GC_API void GC_abort();
! 746: # define ABORT(msg) GC_abort(msg);
! 747: # endif
! 748: # endif
! 749:
! 750: /* Exit abnormally, but without making a mess (e.g. out of memory) */
! 751: # ifdef PCR
! 752: # define EXIT() PCR_Base_Exit(1,PCR_waitForever)
! 753: # else
! 754: # define EXIT() (void)exit(1)
! 755: # endif
! 756:
! 757: /* Print warning message, e.g. almost out of memory. */
! 758: # define WARN(msg,arg) (*GC_current_warn_proc)(msg, (GC_word)(arg))
! 759: extern GC_warn_proc GC_current_warn_proc;
! 760:
! 761: /*********************************/
! 762: /* */
! 763: /* Word-size-dependent defines */
! 764: /* */
! 765: /*********************************/
! 766:
! 767: #if CPP_WORDSZ == 32
! 768: # define WORDS_TO_BYTES(x) ((x)<<2)
! 769: # define BYTES_TO_WORDS(x) ((x)>>2)
! 770: # define LOGWL ((word)5) /* log[2] of CPP_WORDSZ */
! 771: # define modWORDSZ(n) ((n) & 0x1f) /* n mod size of word */
! 772: # if ALIGNMENT != 4
! 773: # define UNALIGNED
! 774: # endif
! 775: #endif
! 776:
! 777: #if CPP_WORDSZ == 64
! 778: # define WORDS_TO_BYTES(x) ((x)<<3)
! 779: # define BYTES_TO_WORDS(x) ((x)>>3)
! 780: # define LOGWL ((word)6) /* log[2] of CPP_WORDSZ */
! 781: # define modWORDSZ(n) ((n) & 0x3f) /* n mod size of word */
! 782: # if ALIGNMENT != 8
! 783: # define UNALIGNED
! 784: # endif
! 785: #endif
! 786:
! 787: #define WORDSZ ((word)CPP_WORDSZ)
! 788: #define SIGNB ((word)1 << (WORDSZ-1))
! 789: #define BYTES_PER_WORD ((word)(sizeof (word)))
! 790: #define ONES ((word)(-1))
! 791: #define divWORDSZ(n) ((n) >> LOGWL) /* divide n by size of word */
! 792:
! 793: /*********************/
! 794: /* */
! 795: /* Size Parameters */
! 796: /* */
! 797: /*********************/
! 798:
! 799: /* heap block size, bytes. Should be power of 2 */
! 800:
! 801: #ifndef HBLKSIZE
! 802: # ifdef SMALL_CONFIG
! 803: # define CPP_LOG_HBLKSIZE 10
! 804: # else
! 805: # if CPP_WORDSZ == 32
! 806: # define CPP_LOG_HBLKSIZE 12
! 807: # else
! 808: # define CPP_LOG_HBLKSIZE 13
! 809: # endif
! 810: # endif
! 811: #else
! 812: # if HBLKSIZE == 512
! 813: # define CPP_LOG_HBLKSIZE 9
! 814: # endif
! 815: # if HBLKSIZE == 1024
! 816: # define CPP_LOG_HBLKSIZE 10
! 817: # endif
! 818: # if HBLKSIZE == 2048
! 819: # define CPP_LOG_HBLKSIZE 11
! 820: # endif
! 821: # if HBLKSIZE == 4096
! 822: # define CPP_LOG_HBLKSIZE 12
! 823: # endif
! 824: # if HBLKSIZE == 8192
! 825: # define CPP_LOG_HBLKSIZE 13
! 826: # endif
! 827: # if HBLKSIZE == 16384
! 828: # define CPP_LOG_HBLKSIZE 14
! 829: # endif
! 830: # ifndef CPP_LOG_HBLKSIZE
! 831: --> fix HBLKSIZE
! 832: # endif
! 833: # undef HBLKSIZE
! 834: #endif
! 835: # define CPP_HBLKSIZE (1 << CPP_LOG_HBLKSIZE)
! 836: # define LOG_HBLKSIZE ((word)CPP_LOG_HBLKSIZE)
! 837: # define HBLKSIZE ((word)CPP_HBLKSIZE)
! 838:
! 839:
! 840: /* max size objects supported by freelist (larger objects may be */
! 841: /* allocated, but less efficiently) */
! 842:
! 843: #define CPP_MAXOBJSZ BYTES_TO_WORDS(CPP_HBLKSIZE/2)
! 844: #define MAXOBJSZ ((word)CPP_MAXOBJSZ)
! 845:
! 846: # define divHBLKSZ(n) ((n) >> LOG_HBLKSIZE)
! 847:
! 848: # define HBLK_PTR_DIFF(p,q) divHBLKSZ((ptr_t)p - (ptr_t)q)
! 849: /* Equivalent to subtracting 2 hblk pointers. */
! 850: /* We do it this way because a compiler should */
! 851: /* find it hard to use an integer division */
! 852: /* instead of a shift. The bundled SunOS 4.1 */
! 853: /* o.w. sometimes pessimizes the subtraction to */
! 854: /* involve a call to .div. */
! 855:
! 856: # define modHBLKSZ(n) ((n) & (HBLKSIZE-1))
! 857:
! 858: # define HBLKPTR(objptr) ((struct hblk *)(((word) (objptr)) & ~(HBLKSIZE-1)))
! 859:
! 860: # define HBLKDISPL(objptr) (((word) (objptr)) & (HBLKSIZE-1))
! 861:
! 862: /* Round up byte allocation requests to integral number of words, etc. */
! 863: # ifdef ADD_BYTE_AT_END
! 864: # define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1))
! 865: # ifdef ALIGN_DOUBLE
! 866: # define ALIGNED_WORDS(n) (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2)) & ~1)
! 867: # else
! 868: # define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
! 869: # endif
! 870: # define SMALL_OBJ(bytes) ((bytes) < WORDS_TO_BYTES(MAXOBJSZ))
! 871: # define ADD_SLOP(bytes) ((bytes)+1)
! 872: # else
! 873: # define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + (WORDS_TO_BYTES(1) - 1))
! 874: # ifdef ALIGN_DOUBLE
! 875: # define ALIGNED_WORDS(n) \
! 876: (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2) - 1) & ~1)
! 877: # else
! 878: # define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
! 879: # endif
! 880: # define SMALL_OBJ(bytes) ((bytes) <= WORDS_TO_BYTES(MAXOBJSZ))
! 881: # define ADD_SLOP(bytes) (bytes)
! 882: # endif
! 883:
! 884:
! 885: /*
! 886: * Hash table representation of sets of pages. This assumes it is
! 887: * OK to add spurious entries to sets.
! 888: * Used by black-listing code, and perhaps by dirty bit maintenance code.
! 889: */
! 890:
! 891: # ifdef LARGE_CONFIG
! 892: # define LOG_PHT_ENTRIES 17
! 893: # else
! 894: # define LOG_PHT_ENTRIES 14 /* Collisions are likely if heap grows */
! 895: /* to more than 16K hblks = 64MB. */
! 896: /* Each hash table occupies 2K bytes. */
! 897: # endif
! 898: # define PHT_ENTRIES ((word)1 << LOG_PHT_ENTRIES)
! 899: # define PHT_SIZE (PHT_ENTRIES >> LOGWL)
! 900: typedef word page_hash_table[PHT_SIZE];
! 901:
! 902: # define PHT_HASH(addr) ((((word)(addr)) >> LOG_HBLKSIZE) & (PHT_ENTRIES - 1))
! 903:
! 904: # define get_pht_entry_from_index(bl, index) \
! 905: (((bl)[divWORDSZ(index)] >> modWORDSZ(index)) & 1)
! 906: # define set_pht_entry_from_index(bl, index) \
! 907: (bl)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index)
! 908: # define clear_pht_entry_from_index(bl, index) \
! 909: (bl)[divWORDSZ(index)] &= ~((word)1 << modWORDSZ(index))
! 910:
! 911:
! 912:
! 913: /********************************************/
! 914: /* */
! 915: /* H e a p B l o c k s */
! 916: /* */
! 917: /********************************************/
! 918:
! 919: /* heap block header */
! 920: #define HBLKMASK (HBLKSIZE-1)
! 921:
! 922: #define BITS_PER_HBLK (HBLKSIZE * 8)
! 923:
! 924: #define MARK_BITS_PER_HBLK (BITS_PER_HBLK/CPP_WORDSZ)
! 925: /* upper bound */
! 926: /* We allocate 1 bit/word. Only the first word */
! 927: /* in each object is actually marked. */
! 928:
! 929: # ifdef ALIGN_DOUBLE
! 930: # define MARK_BITS_SZ (((MARK_BITS_PER_HBLK + 2*CPP_WORDSZ - 1) \
! 931: / (2*CPP_WORDSZ))*2)
! 932: # else
! 933: # define MARK_BITS_SZ ((MARK_BITS_PER_HBLK + CPP_WORDSZ - 1)/CPP_WORDSZ)
! 934: # endif
! 935: /* Upper bound on number of mark words per heap block */
! 936:
! 937: struct hblkhdr {
! 938: word hb_sz; /* If in use, size in words, of objects in the block. */
! 939: /* if free, the size in bytes of the whole block */
! 940: struct hblk * hb_next; /* Link field for hblk free list */
! 941: /* and for lists of chunks waiting to be */
! 942: /* reclaimed. */
! 943: struct hblk * hb_prev; /* Backwards link for free list. */
! 944: word hb_descr; /* object descriptor for marking. See */
! 945: /* mark.h. */
! 946: char* hb_map; /* A pointer to a pointer validity map of the block. */
! 947: /* See GC_obj_map. */
! 948: /* Valid for all blocks with headers. */
! 949: /* Free blocks point to GC_invalid_map. */
! 950: unsigned char hb_obj_kind;
! 951: /* Kind of objects in the block. Each kind */
! 952: /* identifies a mark procedure and a set of */
! 953: /* list headers. Sometimes called regions. */
! 954: unsigned char hb_flags;
! 955: # define IGNORE_OFF_PAGE 1 /* Ignore pointers that do not */
! 956: /* point to the first page of */
! 957: /* this object. */
! 958: # define WAS_UNMAPPED 2 /* This is a free block, which has */
! 959: /* been unmapped from the address */
! 960: /* space. */
! 961: /* GC_remap must be invoked on it */
! 962: /* before it can be reallocated. */
! 963: /* Only set with USE_MUNMAP. */
! 964: unsigned short hb_last_reclaimed;
! 965: /* Value of GC_gc_no when block was */
! 966: /* last allocated or swept. May wrap. */
! 967: /* For a free block, this is maintained */
! 968: /* unly for USE_MUNMAP, and indicates */
! 969: /* when the header was allocated, or */
! 970: /* when the size of the block last */
! 971: /* changed. */
! 972: word hb_marks[MARK_BITS_SZ];
! 973: /* Bit i in the array refers to the */
! 974: /* object starting at the ith word (header */
! 975: /* INCLUDED) in the heap block. */
! 976: /* The lsb of word 0 is numbered 0. */
! 977: /* Unused bits are invalid, and are */
! 978: /* occasionally set, e.g for uncollectable */
! 979: /* objects. */
! 980: };
! 981:
! 982: /* heap block body */
! 983:
! 984: # define DISCARD_WORDS 0
! 985: /* Number of words to be dropped at the beginning of each block */
! 986: /* Must be a multiple of WORDSZ. May reasonably be nonzero */
! 987: /* on machines that don't guarantee longword alignment of */
! 988: /* pointers, so that the number of false hits is minimized. */
! 989: /* 0 and WORDSZ are probably the only reasonable values. */
! 990:
! 991: # define BODY_SZ ((HBLKSIZE-WORDS_TO_BYTES(DISCARD_WORDS))/sizeof(word))
! 992:
! 993: struct hblk {
! 994: # if (DISCARD_WORDS != 0)
! 995: word garbage[DISCARD_WORDS];
! 996: # endif
! 997: word hb_body[BODY_SZ];
! 998: };
! 999:
! 1000: # define HDR_WORDS ((word)DISCARD_WORDS)
! 1001: # define HDR_BYTES ((word)WORDS_TO_BYTES(DISCARD_WORDS))
! 1002:
! 1003: # define OBJ_SZ_TO_BLOCKS(sz) \
! 1004: divHBLKSZ(HDR_BYTES + WORDS_TO_BYTES(sz) + HBLKSIZE-1)
! 1005: /* Size of block (in units of HBLKSIZE) needed to hold objects of */
! 1006: /* given sz (in words). */
! 1007:
! 1008: /* Object free list link */
! 1009: # define obj_link(p) (*(ptr_t *)(p))
! 1010:
! 1011: /* The type of mark procedures. This really belongs in gc_mark.h. */
! 1012: /* But we put it here, so that we can avoid scanning the mark proc */
! 1013: /* table. */
! 1014: typedef struct ms_entry * (*mark_proc)(/* word * addr,
! 1015: struct ms_entry *mark_stack_ptr,
! 1016: struct ms_entry *mark_stack_limit,
! 1017: word env */);
! 1018: # define LOG_MAX_MARK_PROCS 6
! 1019: # define MAX_MARK_PROCS (1 << LOG_MAX_MARK_PROCS)
! 1020:
! 1021: /* Root sets. Logically private to mark_rts.c. But we don't want the */
! 1022: /* tables scanned, so we put them here. */
! 1023: /* MAX_ROOT_SETS is the maximum number of ranges that can be */
! 1024: /* registered as static roots. */
! 1025: # ifdef LARGE_CONFIG
! 1026: # define MAX_ROOT_SETS 4096
! 1027: # else
! 1028: # ifdef PCR
! 1029: # define MAX_ROOT_SETS 1024
! 1030: # else
! 1031: # ifdef MSWIN32
! 1032: # define MAX_ROOT_SETS 512
! 1033: /* Under NT, we add only written pages, which can result */
! 1034: /* in many small root sets. */
! 1035: # else
! 1036: # define MAX_ROOT_SETS 64
! 1037: # endif
! 1038: # endif
! 1039: # endif
! 1040:
! 1041: # define MAX_EXCLUSIONS (MAX_ROOT_SETS/4)
! 1042: /* Maximum number of segments that can be excluded from root sets. */
! 1043:
! 1044: /*
! 1045: * Data structure for excluded static roots.
! 1046: */
! 1047: struct exclusion {
! 1048: ptr_t e_start;
! 1049: ptr_t e_end;
! 1050: };
! 1051:
! 1052: /* Data structure for list of root sets. */
! 1053: /* We keep a hash table, so that we can filter out duplicate additions. */
! 1054: /* Under Win32, we need to do a better job of filtering overlaps, so */
! 1055: /* we resort to sequential search, and pay the price. */
! 1056: struct roots {
! 1057: ptr_t r_start;
! 1058: ptr_t r_end;
! 1059: # ifndef MSWIN32
! 1060: struct roots * r_next;
! 1061: # endif
! 1062: GC_bool r_tmp;
! 1063: /* Delete before registering new dynamic libraries */
! 1064: };
! 1065:
! 1066: #ifndef MSWIN32
! 1067: /* Size of hash table index to roots. */
! 1068: # define LOG_RT_SIZE 6
! 1069: # define RT_SIZE (1 << LOG_RT_SIZE) /* Power of 2, may be != MAX_ROOT_SETS */
! 1070: #endif
! 1071:
! 1072: /* Lists of all heap blocks and free lists */
! 1073: /* as well as other random data structures */
! 1074: /* that should not be scanned by the */
! 1075: /* collector. */
! 1076: /* These are grouped together in a struct */
! 1077: /* so that they can be easily skipped by the */
! 1078: /* GC_mark routine. */
! 1079: /* The ordering is weird to make GC_malloc */
! 1080: /* faster by keeping the important fields */
! 1081: /* sufficiently close together that a */
! 1082: /* single load of a base register will do. */
! 1083: /* Scalars that could easily appear to */
! 1084: /* be pointers are also put here. */
! 1085: /* The main fields should precede any */
! 1086: /* conditionally included fields, so that */
! 1087: /* gc_inl.h will work even if a different set */
! 1088: /* of macros is defined when the client is */
! 1089: /* compiled. */
! 1090:
! 1091: struct _GC_arrays {
! 1092: word _heapsize;
! 1093: word _max_heapsize;
! 1094: word _requested_heapsize; /* Heap size due to explicit expansion */
! 1095: ptr_t _last_heap_addr;
! 1096: ptr_t _prev_heap_addr;
! 1097: word _large_free_bytes;
! 1098: /* Total bytes contained in blocks on large object free */
! 1099: /* list. */
! 1100: word _words_allocd_before_gc;
! 1101: /* Number of words allocated before this */
! 1102: /* collection cycle. */
! 1103: word _words_allocd;
! 1104: /* Number of words allocated during this collection cycle */
! 1105: word _words_wasted;
! 1106: /* Number of words wasted due to internal fragmentation */
! 1107: /* in large objects, or due to dropping blacklisted */
! 1108: /* blocks, since last gc. Approximate. */
! 1109: word _words_finalized;
! 1110: /* Approximate number of words in objects (and headers) */
! 1111: /* That became ready for finalization in the last */
! 1112: /* collection. */
! 1113: word _non_gc_bytes_at_gc;
! 1114: /* Number of explicitly managed bytes of storage */
! 1115: /* at last collection. */
! 1116: word _mem_freed;
! 1117: /* Number of explicitly deallocated words of memory */
! 1118: /* since last collection. */
! 1119: ptr_t _scratch_end_ptr;
! 1120: ptr_t _scratch_last_end_ptr;
! 1121: /* Used by headers.c, and can easily appear to point to */
! 1122: /* heap. */
! 1123: mark_proc _mark_procs[MAX_MARK_PROCS];
! 1124: /* Table of user-defined mark procedures. There is */
! 1125: /* a small number of these, which can be referenced */
! 1126: /* by DS_PROC mark descriptors. See gc_mark.h. */
! 1127: ptr_t _objfreelist[MAXOBJSZ+1];
! 1128: /* free list for objects */
! 1129: ptr_t _aobjfreelist[MAXOBJSZ+1];
! 1130: /* free list for atomic objs */
! 1131:
! 1132: ptr_t _uobjfreelist[MAXOBJSZ+1];
! 1133: /* uncollectable but traced objs */
! 1134: /* objects on this and auobjfreelist */
! 1135: /* are always marked, except during */
! 1136: /* garbage collections. */
! 1137: # ifdef ATOMIC_UNCOLLECTABLE
! 1138: ptr_t _auobjfreelist[MAXOBJSZ+1];
! 1139: # endif
! 1140: /* uncollectable but traced objs */
! 1141:
! 1142: # ifdef GATHERSTATS
! 1143: word _composite_in_use;
! 1144: /* Number of words in accessible composite */
! 1145: /* objects. */
! 1146: word _atomic_in_use;
! 1147: /* Number of words in accessible atomic */
! 1148: /* objects. */
! 1149: # endif
! 1150: # ifdef USE_MUNMAP
! 1151: word _unmapped_bytes;
! 1152: # endif
! 1153: # ifdef MERGE_SIZES
! 1154: unsigned _size_map[WORDS_TO_BYTES(MAXOBJSZ+1)];
! 1155: /* Number of words to allocate for a given allocation request in */
! 1156: /* bytes. */
! 1157: # endif
! 1158:
! 1159: # ifdef STUBBORN_ALLOC
! 1160: ptr_t _sobjfreelist[MAXOBJSZ+1];
! 1161: # endif
! 1162: /* free list for immutable objects */
! 1163: ptr_t _obj_map[MAXOBJSZ+1];
! 1164: /* If not NIL, then a pointer to a map of valid */
! 1165: /* object addresses. _obj_map[sz][i] is j if the */
! 1166: /* address block_start+i is a valid pointer */
! 1167: /* to an object at */
! 1168: /* block_start+i&~3 - WORDS_TO_BYTES(j). */
! 1169: /* (If ALL_INTERIOR_POINTERS is defined, then */
! 1170: /* instead ((short *)(hb_map[sz])[i] is j if */
! 1171: /* block_start+WORDS_TO_BYTES(i) is in the */
! 1172: /* interior of an object starting at */
! 1173: /* block_start+WORDS_TO_BYTES(i-j)). */
! 1174: /* It is OBJ_INVALID if */
! 1175: /* block_start+WORDS_TO_BYTES(i) is not */
! 1176: /* valid as a pointer to an object. */
! 1177: /* We assume all values of j <= OBJ_INVALID. */
! 1178: /* The zeroth entry corresponds to large objects.*/
! 1179: # ifdef ALL_INTERIOR_POINTERS
! 1180: # define map_entry_type short
! 1181: # define OBJ_INVALID 0x7fff
! 1182: # define MAP_ENTRY(map, bytes) \
! 1183: (((map_entry_type *)(map))[BYTES_TO_WORDS(bytes)])
! 1184: # define MAP_ENTRIES BYTES_TO_WORDS(HBLKSIZE)
! 1185: # define MAP_SIZE (MAP_ENTRIES * sizeof(map_entry_type))
! 1186: # define OFFSET_VALID(displ) TRUE
! 1187: # define CPP_MAX_OFFSET (HBLKSIZE - HDR_BYTES - 1)
! 1188: # define MAX_OFFSET ((word)CPP_MAX_OFFSET)
! 1189: # else
! 1190: # define map_entry_type char
! 1191: # define OBJ_INVALID 0x7f
! 1192: # define MAP_ENTRY(map, bytes) \
! 1193: (map)[bytes]
! 1194: # define MAP_ENTRIES HBLKSIZE
! 1195: # define MAP_SIZE MAP_ENTRIES
! 1196: # define CPP_MAX_OFFSET (WORDS_TO_BYTES(OBJ_INVALID) - 1)
! 1197: # define MAX_OFFSET ((word)CPP_MAX_OFFSET)
! 1198: # define VALID_OFFSET_SZ \
! 1199: (CPP_MAX_OFFSET > WORDS_TO_BYTES(CPP_MAXOBJSZ)? \
! 1200: CPP_MAX_OFFSET+1 \
! 1201: : WORDS_TO_BYTES(CPP_MAXOBJSZ)+1)
! 1202: char _valid_offsets[VALID_OFFSET_SZ];
! 1203: /* GC_valid_offsets[i] == TRUE ==> i */
! 1204: /* is registered as a displacement. */
! 1205: # define OFFSET_VALID(displ) GC_valid_offsets[displ]
! 1206: char _modws_valid_offsets[sizeof(word)];
! 1207: /* GC_valid_offsets[i] ==> */
! 1208: /* GC_modws_valid_offsets[i%sizeof(word)] */
! 1209: # endif
! 1210: # ifdef STUBBORN_ALLOC
! 1211: page_hash_table _changed_pages;
! 1212: /* Stubborn object pages that were changes since last call to */
! 1213: /* GC_read_changed. */
! 1214: page_hash_table _prev_changed_pages;
! 1215: /* Stubborn object pages that were changes before last call to */
! 1216: /* GC_read_changed. */
! 1217: # endif
! 1218: # if defined(PROC_VDB) || defined(MPROTECT_VDB)
! 1219: page_hash_table _grungy_pages; /* Pages that were dirty at last */
! 1220: /* GC_read_dirty. */
! 1221: # endif
! 1222: # ifdef MPROTECT_VDB
! 1223: VOLATILE page_hash_table _dirty_pages;
! 1224: /* Pages dirtied since last GC_read_dirty. */
! 1225: # endif
! 1226: # ifdef PROC_VDB
! 1227: page_hash_table _written_pages; /* Pages ever dirtied */
! 1228: # endif
! 1229: # ifdef LARGE_CONFIG
! 1230: # if CPP_WORDSZ > 32
! 1231: # define MAX_HEAP_SECTS 4096 /* overflows at roughly 64 GB */
! 1232: # else
! 1233: # define MAX_HEAP_SECTS 768 /* Separately added heap sections. */
! 1234: # endif
! 1235: # else
! 1236: # define MAX_HEAP_SECTS 256
! 1237: # endif
! 1238: struct HeapSect {
! 1239: ptr_t hs_start; word hs_bytes;
! 1240: } _heap_sects[MAX_HEAP_SECTS];
! 1241: # ifdef MSWIN32
! 1242: ptr_t _heap_bases[MAX_HEAP_SECTS];
! 1243: /* Start address of memory regions obtained from kernel. */
! 1244: # endif
! 1245: struct roots _static_roots[MAX_ROOT_SETS];
! 1246: # ifndef MSWIN32
! 1247: struct roots * _root_index[RT_SIZE];
! 1248: # endif
! 1249: struct exclusion _excl_table[MAX_EXCLUSIONS];
! 1250: /* Block header index; see gc_headers.h */
! 1251: bottom_index * _all_nils;
! 1252: bottom_index * _top_index [TOP_SZ];
! 1253: #ifdef SAVE_CALL_CHAIN
! 1254: struct callinfo _last_stack[NFRAMES]; /* Stack at last garbage collection.*/
! 1255: /* Useful for debugging mysterious */
! 1256: /* object disappearances. */
! 1257: /* In the multithreaded case, we */
! 1258: /* currently only save the calling */
! 1259: /* stack. */
! 1260: #endif
! 1261: };
! 1262:
! 1263: GC_API GC_FAR struct _GC_arrays GC_arrays;
! 1264:
! 1265: # define GC_objfreelist GC_arrays._objfreelist
! 1266: # define GC_aobjfreelist GC_arrays._aobjfreelist
! 1267: # define GC_uobjfreelist GC_arrays._uobjfreelist
! 1268: # ifdef ATOMIC_UNCOLLECTABLE
! 1269: # define GC_auobjfreelist GC_arrays._auobjfreelist
! 1270: # endif
! 1271: # define GC_sobjfreelist GC_arrays._sobjfreelist
! 1272: # define GC_valid_offsets GC_arrays._valid_offsets
! 1273: # define GC_modws_valid_offsets GC_arrays._modws_valid_offsets
! 1274: # ifdef STUBBORN_ALLOC
! 1275: # define GC_changed_pages GC_arrays._changed_pages
! 1276: # define GC_prev_changed_pages GC_arrays._prev_changed_pages
! 1277: # endif
! 1278: # define GC_obj_map GC_arrays._obj_map
! 1279: # define GC_last_heap_addr GC_arrays._last_heap_addr
! 1280: # define GC_prev_heap_addr GC_arrays._prev_heap_addr
! 1281: # define GC_words_allocd GC_arrays._words_allocd
! 1282: # define GC_words_wasted GC_arrays._words_wasted
! 1283: # define GC_large_free_bytes GC_arrays._large_free_bytes
! 1284: # define GC_words_finalized GC_arrays._words_finalized
! 1285: # define GC_non_gc_bytes_at_gc GC_arrays._non_gc_bytes_at_gc
! 1286: # define GC_mem_freed GC_arrays._mem_freed
! 1287: # define GC_scratch_end_ptr GC_arrays._scratch_end_ptr
! 1288: # define GC_scratch_last_end_ptr GC_arrays._scratch_last_end_ptr
! 1289: # define GC_mark_procs GC_arrays._mark_procs
! 1290: # define GC_heapsize GC_arrays._heapsize
! 1291: # define GC_max_heapsize GC_arrays._max_heapsize
! 1292: # define GC_requested_heapsize GC_arrays._requested_heapsize
! 1293: # define GC_words_allocd_before_gc GC_arrays._words_allocd_before_gc
! 1294: # define GC_heap_sects GC_arrays._heap_sects
! 1295: # define GC_last_stack GC_arrays._last_stack
! 1296: # ifdef USE_MUNMAP
! 1297: # define GC_unmapped_bytes GC_arrays._unmapped_bytes
! 1298: # endif
! 1299: # ifdef MSWIN32
! 1300: # define GC_heap_bases GC_arrays._heap_bases
! 1301: # endif
! 1302: # define GC_static_roots GC_arrays._static_roots
! 1303: # define GC_root_index GC_arrays._root_index
! 1304: # define GC_excl_table GC_arrays._excl_table
! 1305: # define GC_all_nils GC_arrays._all_nils
! 1306: # define GC_top_index GC_arrays._top_index
! 1307: # if defined(PROC_VDB) || defined(MPROTECT_VDB)
! 1308: # define GC_grungy_pages GC_arrays._grungy_pages
! 1309: # endif
! 1310: # ifdef MPROTECT_VDB
! 1311: # define GC_dirty_pages GC_arrays._dirty_pages
! 1312: # endif
! 1313: # ifdef PROC_VDB
! 1314: # define GC_written_pages GC_arrays._written_pages
! 1315: # endif
! 1316: # ifdef GATHERSTATS
! 1317: # define GC_composite_in_use GC_arrays._composite_in_use
! 1318: # define GC_atomic_in_use GC_arrays._atomic_in_use
! 1319: # endif
! 1320: # ifdef MERGE_SIZES
! 1321: # define GC_size_map GC_arrays._size_map
! 1322: # endif
! 1323:
! 1324: # define beginGC_arrays ((ptr_t)(&GC_arrays))
! 1325: # define endGC_arrays (((ptr_t)(&GC_arrays)) + (sizeof GC_arrays))
! 1326:
! 1327: #define USED_HEAP_SIZE (GC_heapsize - GC_large_free_bytes)
! 1328:
! 1329: /* Object kinds: */
! 1330: # define MAXOBJKINDS 16
! 1331:
! 1332: extern struct obj_kind {
! 1333: ptr_t *ok_freelist; /* Array of free listheaders for this kind of object */
! 1334: /* Point either to GC_arrays or to storage allocated */
! 1335: /* with GC_scratch_alloc. */
! 1336: struct hblk **ok_reclaim_list;
! 1337: /* List headers for lists of blocks waiting to be */
! 1338: /* swept. */
! 1339: word ok_descriptor; /* Descriptor template for objects in this */
! 1340: /* block. */
! 1341: GC_bool ok_relocate_descr;
! 1342: /* Add object size in bytes to descriptor */
! 1343: /* template to obtain descriptor. Otherwise */
! 1344: /* template is used as is. */
! 1345: GC_bool ok_init; /* Clear objects before putting them on the free list. */
! 1346: } GC_obj_kinds[MAXOBJKINDS];
! 1347:
! 1348: # define endGC_obj_kinds (((ptr_t)(&GC_obj_kinds)) + (sizeof GC_obj_kinds))
! 1349:
! 1350: # define end_gc_area ((ptr_t)endGC_arrays == (ptr_t)(&GC_obj_kinds) ? \
! 1351: endGC_obj_kinds : endGC_arrays)
! 1352:
! 1353: /* Predefined kinds: */
! 1354: # define PTRFREE 0
! 1355: # define NORMAL 1
! 1356: # define UNCOLLECTABLE 2
! 1357: # ifdef ATOMIC_UNCOLLECTABLE
! 1358: # define AUNCOLLECTABLE 3
! 1359: # define STUBBORN 4
! 1360: # define IS_UNCOLLECTABLE(k) (((k) & ~1) == UNCOLLECTABLE)
! 1361: # else
! 1362: # define STUBBORN 3
! 1363: # define IS_UNCOLLECTABLE(k) ((k) == UNCOLLECTABLE)
! 1364: # endif
! 1365:
! 1366: extern int GC_n_kinds;
! 1367:
! 1368: GC_API word GC_fo_entries;
! 1369:
! 1370: extern word GC_n_heap_sects; /* Number of separately added heap */
! 1371: /* sections. */
! 1372:
! 1373: extern word GC_page_size;
! 1374:
! 1375: # ifdef MSWIN32
! 1376: extern word GC_n_heap_bases; /* See GC_heap_bases. */
! 1377: # endif
! 1378:
! 1379: extern word GC_total_stack_black_listed;
! 1380: /* Number of bytes on stack blacklist. */
! 1381:
! 1382: extern word GC_black_list_spacing;
! 1383: /* Average number of bytes between blacklisted */
! 1384: /* blocks. Approximate. */
! 1385: /* Counts only blocks that are */
! 1386: /* "stack-blacklisted", i.e. that are */
! 1387: /* problematic in the interior of an object. */
! 1388:
! 1389: extern char * GC_invalid_map;
! 1390: /* Pointer to the nowhere valid hblk map */
! 1391: /* Blocks pointing to this map are free. */
! 1392:
! 1393: extern struct hblk * GC_hblkfreelist[];
! 1394: /* List of completely empty heap blocks */
! 1395: /* Linked through hb_next field of */
! 1396: /* header structure associated with */
! 1397: /* block. */
! 1398:
! 1399: extern GC_bool GC_is_initialized; /* GC_init() has been run. */
! 1400:
! 1401: extern GC_bool GC_objects_are_marked; /* There are marked objects in */
! 1402: /* the heap. */
! 1403:
! 1404: #ifndef SMALL_CONFIG
! 1405: extern GC_bool GC_incremental;
! 1406: /* Using incremental/generational collection. */
! 1407: #else
! 1408: # define GC_incremental FALSE
! 1409: /* Hopefully allow optimizer to remove some code. */
! 1410: #endif
! 1411:
! 1412: extern GC_bool GC_dirty_maintained;
! 1413: /* Dirty bits are being maintained, */
! 1414: /* either for incremental collection, */
! 1415: /* or to limit the root set. */
! 1416:
! 1417: extern word GC_root_size; /* Total size of registered root sections */
! 1418:
! 1419: extern GC_bool GC_debugging_started; /* GC_debug_malloc has been called. */
! 1420:
! 1421: extern ptr_t GC_least_plausible_heap_addr;
! 1422: extern ptr_t GC_greatest_plausible_heap_addr;
! 1423: /* Bounds on the heap. Guaranteed valid */
! 1424: /* Likely to include future heap expansion. */
! 1425:
! 1426: /* Operations */
! 1427: # ifndef abs
! 1428: # define abs(x) ((x) < 0? (-(x)) : (x))
! 1429: # endif
! 1430:
! 1431:
! 1432: /* Marks are in a reserved area in */
! 1433: /* each heap block. Each word has one mark bit associated */
! 1434: /* with it. Only those corresponding to the beginning of an */
! 1435: /* object are used. */
! 1436:
! 1437:
! 1438: /* Mark bit operations */
! 1439:
! 1440: /*
! 1441: * Retrieve, set, clear the mark bit corresponding
! 1442: * to the nth word in a given heap block.
! 1443: *
! 1444: * (Recall that bit n corresponds to object beginning at word n
! 1445: * relative to the beginning of the block, including unused words)
! 1446: */
! 1447:
! 1448: # define mark_bit_from_hdr(hhdr,n) (((hhdr)->hb_marks[divWORDSZ(n)] \
! 1449: >> (modWORDSZ(n))) & (word)1)
! 1450: # define set_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
! 1451: |= (word)1 << modWORDSZ(n)
! 1452:
! 1453: # define clear_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
! 1454: &= ~((word)1 << modWORDSZ(n))
! 1455:
! 1456: /* Important internal collector routines */
! 1457:
! 1458: ptr_t GC_approx_sp();
! 1459:
! 1460: GC_bool GC_should_collect();
! 1461:
! 1462: void GC_apply_to_all_blocks(/*fn, client_data*/);
! 1463: /* Invoke fn(hbp, client_data) for each */
! 1464: /* allocated heap block. */
! 1465: struct hblk * GC_next_used_block(/* struct hblk * h */);
! 1466: /* Return first in-use block >= h */
! 1467: struct hblk * GC_prev_block(/* struct hblk * h */);
! 1468: /* Return last block <= h. Returned block */
! 1469: /* is managed by GC, but may or may not be in */
! 1470: /* use. */
! 1471: void GC_mark_init();
! 1472: void GC_clear_marks(); /* Clear mark bits for all heap objects. */
! 1473: void GC_invalidate_mark_state(); /* Tell the marker that marked */
! 1474: /* objects may point to unmarked */
! 1475: /* ones, and roots may point to */
! 1476: /* unmarked objects. */
! 1477: /* Reset mark stack. */
! 1478: void GC_mark_from_mark_stack(); /* Mark from everything on the mark stack. */
! 1479: /* Return after about one pages worth of */
! 1480: /* work. */
! 1481: GC_bool GC_mark_stack_empty();
! 1482: GC_bool GC_mark_some(/* cold_gc_frame */);
! 1483: /* Perform about one pages worth of marking */
! 1484: /* work of whatever kind is needed. Returns */
! 1485: /* quickly if no collection is in progress. */
! 1486: /* Return TRUE if mark phase finished. */
! 1487: void GC_initiate_gc(); /* initiate collection. */
! 1488: /* If the mark state is invalid, this */
! 1489: /* becomes full colleection. Otherwise */
! 1490: /* it's partial. */
! 1491: void GC_push_all(/*b,t*/); /* Push everything in a range */
! 1492: /* onto mark stack. */
! 1493: void GC_push_dirty(/*b,t*/); /* Push all possibly changed */
! 1494: /* subintervals of [b,t) onto */
! 1495: /* mark stack. */
! 1496: #ifndef SMALL_CONFIG
! 1497: void GC_push_conditional(/* ptr_t b, ptr_t t, GC_bool all*/);
! 1498: #else
! 1499: # define GC_push_conditional(b, t, all) GC_push_all(b, t)
! 1500: #endif
! 1501: /* Do either of the above, depending */
! 1502: /* on the third arg. */
! 1503: void GC_push_all_stack(/*b,t*/); /* As above, but consider */
! 1504: /* interior pointers as valid */
! 1505: void GC_push_all_eager(/*b,t*/); /* Same as GC_push_all_stack, but */
! 1506: /* ensures that stack is scanned */
! 1507: /* immediately, not just scheduled */
! 1508: /* for scanning. */
! 1509: #ifndef THREADS
! 1510: void GC_push_all_stack_partially_eager(/* bottom, top, cold_gc_frame */);
! 1511: /* Similar to GC_push_all_eager, but only the */
! 1512: /* part hotter than cold_gc_frame is scanned */
! 1513: /* immediately. Needed to endure that callee- */
! 1514: /* save registers are not missed. */
! 1515: #else
! 1516: /* In the threads case, we push part of the current thread stack */
! 1517: /* with GC_push_all_eager when we push the registers. This gets the */
! 1518: /* callee-save registers that may disappear. The remainder of the */
! 1519: /* stacks are scheduled for scanning in *GC_push_other_roots, which */
! 1520: /* is thread-package-specific. */
! 1521: #endif
! 1522: void GC_push_current_stack(/* ptr_t cold_gc_frame */);
! 1523: /* Push enough of the current stack eagerly to */
! 1524: /* ensure that callee-save registers saved in */
! 1525: /* GC frames are scanned. */
! 1526: /* In the non-threads case, schedule entire */
! 1527: /* stack for scanning. */
! 1528: void GC_push_roots(/* GC_bool all, ptr_t cold_gc_frame */);
! 1529: /* Push all or dirty roots. */
! 1530: extern void (*GC_push_other_roots)();
! 1531: /* Push system or application specific roots */
! 1532: /* onto the mark stack. In some environments */
! 1533: /* (e.g. threads environments) this is */
! 1534: /* predfined to be non-zero. A client supplied */
! 1535: /* replacement should also call the original */
! 1536: /* function. */
! 1537: extern void (*GC_start_call_back)(/* void */);
! 1538: /* Called at start of full collections. */
! 1539: /* Not called if 0. Called with allocation */
! 1540: /* lock held. */
! 1541: /* 0 by default. */
! 1542: void GC_push_regs(); /* Push register contents onto mark stack. */
! 1543: /* If NURSERY is defined, the default push */
! 1544: /* action can be overridden with GC_push_proc */
! 1545: void GC_remark(); /* Mark from all marked objects. Used */
! 1546: /* only if we had to drop something. */
! 1547:
! 1548: # ifdef NURSERY
! 1549: extern void (*GC_push_proc)(ptr_t);
! 1550: # endif
! 1551: # if defined(MSWIN32)
! 1552: void __cdecl GC_push_one();
! 1553: # else
! 1554: void GC_push_one(/*p*/); /* If p points to an object, mark it */
! 1555: /* and push contents on the mark stack */
! 1556: # endif
! 1557: void GC_push_one_checked(/*p*/); /* Ditto, omits plausibility test */
! 1558: void GC_push_marked(/* struct hblk h, hdr * hhdr */);
! 1559: /* Push contents of all marked objects in h onto */
! 1560: /* mark stack. */
! 1561: #ifdef SMALL_CONFIG
! 1562: # define GC_push_next_marked_dirty(h) GC_push_next_marked(h)
! 1563: #else
! 1564: struct hblk * GC_push_next_marked_dirty(/* h */);
! 1565: /* Invoke GC_push_marked on next dirty block above h. */
! 1566: /* Return a pointer just past the end of this block. */
! 1567: #endif /* !SMALL_CONFIG */
! 1568: struct hblk * GC_push_next_marked(/* h */);
! 1569: /* Ditto, but also mark from clean pages. */
! 1570: struct hblk * GC_push_next_marked_uncollectable(/* h */);
! 1571: /* Ditto, but mark only from uncollectable pages. */
! 1572: GC_bool GC_stopped_mark(); /* Stop world and mark from all roots */
! 1573: /* and rescuers. */
! 1574: void GC_clear_hdr_marks(/* hhdr */); /* Clear the mark bits in a header */
! 1575: void GC_set_hdr_marks(/* hhdr */); /* Set the mark bits in a header */
! 1576: void GC_add_roots_inner();
! 1577: GC_bool GC_is_static_root(/* ptr_t p */);
! 1578: /* Is the address p in one of the registered static */
! 1579: /* root sections? */
! 1580: void GC_register_dynamic_libraries();
! 1581: /* Add dynamic library data sections to the root set. */
! 1582:
! 1583: /* Machine dependent startup routines */
! 1584: ptr_t GC_get_stack_base();
! 1585: void GC_register_data_segments();
! 1586:
! 1587: /* Black listing: */
! 1588: void GC_bl_init();
! 1589: # ifndef ALL_INTERIOR_POINTERS
! 1590: void GC_add_to_black_list_normal(/* bits, maybe source */);
! 1591: /* Register bits as a possible future false */
! 1592: /* reference from the heap or static data */
! 1593: # ifdef PRINT_BLACK_LIST
! 1594: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1595: GC_add_to_black_list_normal(bits, source)
! 1596: # else
! 1597: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1598: GC_add_to_black_list_normal(bits)
! 1599: # endif
! 1600: # else
! 1601: # ifdef PRINT_BLACK_LIST
! 1602: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1603: GC_add_to_black_list_stack(bits, source)
! 1604: # else
! 1605: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1606: GC_add_to_black_list_stack(bits)
! 1607: # endif
! 1608: # endif
! 1609:
! 1610: void GC_add_to_black_list_stack(/* bits, maybe source */);
! 1611: struct hblk * GC_is_black_listed(/* h, len */);
! 1612: /* If there are likely to be false references */
! 1613: /* to a block starting at h of the indicated */
! 1614: /* length, then return the next plausible */
! 1615: /* starting location for h that might avoid */
! 1616: /* these false references. */
! 1617: void GC_promote_black_lists();
! 1618: /* Declare an end to a black listing phase. */
! 1619: void GC_unpromote_black_lists();
! 1620: /* Approximately undo the effect of the above. */
! 1621: /* This actually loses some information, but */
! 1622: /* only in a reasonably safe way. */
! 1623: word GC_number_stack_black_listed(/*struct hblk *start, struct hblk *endp1 */);
! 1624: /* Return the number of (stack) blacklisted */
! 1625: /* blocks in the range for statistical */
! 1626: /* purposes. */
! 1627:
! 1628: ptr_t GC_scratch_alloc(/*bytes*/);
! 1629: /* GC internal memory allocation for */
! 1630: /* small objects. Deallocation is not */
! 1631: /* possible. */
! 1632:
! 1633: /* Heap block layout maps: */
! 1634: void GC_invalidate_map(/* hdr */);
! 1635: /* Remove the object map associated */
! 1636: /* with the block. This identifies */
! 1637: /* the block as invalid to the mark */
! 1638: /* routines. */
! 1639: GC_bool GC_add_map_entry(/*sz*/);
! 1640: /* Add a heap block map for objects of */
! 1641: /* size sz to obj_map. */
! 1642: /* Return FALSE on failure. */
! 1643: void GC_register_displacement_inner(/*offset*/);
! 1644: /* Version of GC_register_displacement */
! 1645: /* that assumes lock is already held */
! 1646: /* and signals are already disabled. */
! 1647:
! 1648: /* hblk allocation: */
! 1649: void GC_new_hblk(/*size_in_words, kind*/);
! 1650: /* Allocate a new heap block, and build */
! 1651: /* a free list in it. */
! 1652: struct hblk * GC_allochblk(/*size_in_words, kind*/);
! 1653: /* Allocate a heap block, clear it if */
! 1654: /* for composite objects, inform */
! 1655: /* the marker that block is valid */
! 1656: /* for objects of indicated size. */
! 1657: /* sz < 0 ==> atomic. */
! 1658: void GC_freehblk(); /* Deallocate a heap block and mark it */
! 1659: /* as invalid. */
! 1660:
! 1661: /* Misc GC: */
! 1662: void GC_init_inner();
! 1663: GC_bool GC_expand_hp_inner();
! 1664: void GC_start_reclaim(/*abort_if_found*/);
! 1665: /* Restore unmarked objects to free */
! 1666: /* lists, or (if abort_if_found is */
! 1667: /* TRUE) report them. */
! 1668: /* Sweeping of small object pages is */
! 1669: /* largely deferred. */
! 1670: void GC_continue_reclaim(/*size, kind*/);
! 1671: /* Sweep pages of the given size and */
! 1672: /* kind, as long as possible, and */
! 1673: /* as long as the corr. free list is */
! 1674: /* empty. */
! 1675: void GC_reclaim_or_delete_all();
! 1676: /* Arrange for all reclaim lists to be */
! 1677: /* empty. Judiciously choose between */
! 1678: /* sweeping and discarding each page. */
! 1679: GC_bool GC_reclaim_all(/* GC_stop_func f*/);
! 1680: /* Reclaim all blocks. Abort (in a */
! 1681: /* consistent state) if f returns TRUE. */
! 1682: GC_bool GC_block_empty(/* hhdr */); /* Block completely unmarked? */
! 1683: GC_bool GC_never_stop_func(); /* Returns FALSE. */
! 1684: GC_bool GC_try_to_collect_inner(/* GC_stop_func f */);
! 1685: /* Collect; caller must have acquired */
! 1686: /* lock and disabled signals. */
! 1687: /* Collection is aborted if f returns */
! 1688: /* TRUE. Returns TRUE if it completes */
! 1689: /* successfully. */
! 1690: # define GC_gcollect_inner() \
! 1691: (void) GC_try_to_collect_inner(GC_never_stop_func)
! 1692: void GC_finish_collection(); /* Finish collection. Mark bits are */
! 1693: /* consistent and lock is still held. */
! 1694: GC_bool GC_collect_or_expand(/* needed_blocks */);
! 1695: /* Collect or expand heap in an attempt */
! 1696: /* make the indicated number of free */
! 1697: /* blocks available. Should be called */
! 1698: /* until the blocks are available or */
! 1699: /* until it fails by returning FALSE. */
! 1700: GC_API void GC_init(); /* Initialize collector. */
! 1701: void GC_collect_a_little_inner(/* int n */);
! 1702: /* Do n units worth of garbage */
! 1703: /* collection work, if appropriate. */
! 1704: /* A unit is an amount appropriate for */
! 1705: /* HBLKSIZE bytes of allocation. */
! 1706: ptr_t GC_generic_malloc(/* bytes, kind */);
! 1707: /* Allocate an object of the given */
! 1708: /* kind. By default, there are only */
! 1709: /* a few kinds: composite(pointerfree), */
! 1710: /* atomic, uncollectable, etc. */
! 1711: /* We claim it's possible for clever */
! 1712: /* client code that understands GC */
! 1713: /* internals to add more, e.g. to */
! 1714: /* communicate object layout info */
! 1715: /* to the collector. */
! 1716: ptr_t GC_generic_malloc_ignore_off_page(/* bytes, kind */);
! 1717: /* As above, but pointers past the */
! 1718: /* first page of the resulting object */
! 1719: /* are ignored. */
! 1720: ptr_t GC_generic_malloc_inner(/* bytes, kind */);
! 1721: /* Ditto, but I already hold lock, etc. */
! 1722: ptr_t GC_generic_malloc_words_small GC_PROTO((size_t words, int kind));
! 1723: /* As above, but size in units of words */
! 1724: /* Bypasses MERGE_SIZES. Assumes */
! 1725: /* words <= MAXOBJSZ. */
! 1726: ptr_t GC_generic_malloc_inner_ignore_off_page(/* bytes, kind */);
! 1727: /* Allocate an object, where */
! 1728: /* the client guarantees that there */
! 1729: /* will always be a pointer to the */
! 1730: /* beginning of the object while the */
! 1731: /* object is live. */
! 1732: ptr_t GC_allocobj(/* sz_inn_words, kind */);
! 1733: /* Make the indicated */
! 1734: /* free list nonempty, and return its */
! 1735: /* head. */
! 1736:
! 1737: void GC_init_headers();
! 1738: struct hblkhdr * GC_install_header(/*h*/);
! 1739: /* Install a header for block h. */
! 1740: /* Return 0 on failure, or the header */
! 1741: /* otherwise. */
! 1742: GC_bool GC_install_counts(/*h, sz*/);
! 1743: /* Set up forwarding counts for block */
! 1744: /* h of size sz. */
! 1745: /* Return FALSE on failure. */
! 1746: void GC_remove_header(/*h*/);
! 1747: /* Remove the header for block h. */
! 1748: void GC_remove_counts(/*h, sz*/);
! 1749: /* Remove forwarding counts for h. */
! 1750: hdr * GC_find_header(/*p*/); /* Debugging only. */
! 1751:
! 1752: void GC_finalize(); /* Perform all indicated finalization actions */
! 1753: /* on unmarked objects. */
! 1754: /* Unreachable finalizable objects are enqueued */
! 1755: /* for processing by GC_invoke_finalizers. */
! 1756: /* Invoked with lock. */
! 1757:
! 1758: void GC_add_to_heap(/*p, bytes*/);
! 1759: /* Add a HBLKSIZE aligned chunk to the heap. */
! 1760:
! 1761: void GC_print_obj(/* ptr_t p */);
! 1762: /* P points to somewhere inside an object with */
! 1763: /* debugging info. Print a human readable */
! 1764: /* description of the object to stderr. */
! 1765: extern void (*GC_check_heap)();
! 1766: /* Check that all objects in the heap with */
! 1767: /* debugging info are intact. Print */
! 1768: /* descriptions of any that are not. */
! 1769: extern void (*GC_print_heap_obj)(/* ptr_t p */);
! 1770: /* If possible print s followed by a more */
! 1771: /* detailed description of the object */
! 1772: /* referred to by p. */
! 1773:
! 1774: /* Memory unmapping: */
! 1775: #ifdef USE_MUNMAP
! 1776: void GC_unmap_old(void);
! 1777: void GC_merge_unmapped(void);
! 1778: void GC_unmap(ptr_t start, word bytes);
! 1779: void GC_remap(ptr_t start, word bytes);
! 1780: void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word bytes2);
! 1781: #endif
! 1782:
! 1783: /* Virtual dirty bit implementation: */
! 1784: /* Each implementation exports the following: */
! 1785: void GC_read_dirty(); /* Retrieve dirty bits. */
! 1786: GC_bool GC_page_was_dirty(/* struct hblk * h */);
! 1787: /* Read retrieved dirty bits. */
! 1788: GC_bool GC_page_was_ever_dirty(/* struct hblk * h */);
! 1789: /* Could the page contain valid heap pointers? */
! 1790: void GC_is_fresh(/* struct hblk * h, word number_of_blocks */);
! 1791: /* Assert the region currently contains no */
! 1792: /* valid pointers. */
! 1793: void GC_write_hint(/* struct hblk * h */);
! 1794: /* h is about to be written. */
! 1795: void GC_dirty_init();
! 1796:
! 1797: /* Slow/general mark bit manipulation: */
! 1798: GC_API GC_bool GC_is_marked();
! 1799: void GC_clear_mark_bit();
! 1800: void GC_set_mark_bit();
! 1801:
! 1802: /* Stubborn objects: */
! 1803: void GC_read_changed(); /* Analogous to GC_read_dirty */
! 1804: GC_bool GC_page_was_changed(/* h */); /* Analogous to GC_page_was_dirty */
! 1805: void GC_clean_changing_list(); /* Collect obsolete changing list entries */
! 1806: void GC_stubborn_init();
! 1807:
! 1808: /* Debugging print routines: */
! 1809: void GC_print_block_list();
! 1810: void GC_print_hblkfreelist();
! 1811: void GC_print_heap_sects();
! 1812: void GC_print_static_roots();
! 1813: void GC_dump();
! 1814:
! 1815: #ifdef KEEP_BACK_PTRS
! 1816: void GC_store_back_pointer(ptr_t source, ptr_t dest);
! 1817: void GC_marked_for_finalization(ptr_t dest);
! 1818: # define GC_STORE_BACK_PTR(source, dest) GC_store_back_pointer(source, dest)
! 1819: # define GC_MARKED_FOR_FINALIZATION(dest) GC_marked_for_finalization(dest)
! 1820: #else
! 1821: # define GC_STORE_BACK_PTR(source, dest)
! 1822: # define GC_MARKED_FOR_FINALIZATION(dest)
! 1823: #endif
! 1824:
! 1825: /* Make arguments appear live to compiler */
! 1826: # ifdef __WATCOMC__
! 1827: void GC_noop(void*, ...);
! 1828: # else
! 1829: GC_API void GC_noop();
! 1830: # endif
! 1831:
! 1832: void GC_noop1(/* word arg */);
! 1833:
! 1834: /* Logging and diagnostic output: */
! 1835: GC_API void GC_printf GC_PROTO((char * format, long, long, long, long, long, long));
! 1836: /* A version of printf that doesn't allocate, */
! 1837: /* is restricted to long arguments, and */
! 1838: /* (unfortunately) doesn't use varargs for */
! 1839: /* portability. Restricted to 6 args and */
! 1840: /* 1K total output length. */
! 1841: /* (We use sprintf. Hopefully that doesn't */
! 1842: /* allocate for long arguments.) */
! 1843: # define GC_printf0(f) GC_printf(f, 0l, 0l, 0l, 0l, 0l, 0l)
! 1844: # define GC_printf1(f,a) GC_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
! 1845: # define GC_printf2(f,a,b) GC_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
! 1846: # define GC_printf3(f,a,b,c) GC_printf(f, (long)a, (long)b, (long)c, 0l, 0l, 0l)
! 1847: # define GC_printf4(f,a,b,c,d) GC_printf(f, (long)a, (long)b, (long)c, \
! 1848: (long)d, 0l, 0l)
! 1849: # define GC_printf5(f,a,b,c,d,e) GC_printf(f, (long)a, (long)b, (long)c, \
! 1850: (long)d, (long)e, 0l)
! 1851: # define GC_printf6(f,a,b,c,d,e,g) GC_printf(f, (long)a, (long)b, (long)c, \
! 1852: (long)d, (long)e, (long)g)
! 1853:
! 1854: void GC_err_printf(/* format, a, b, c, d, e, f */);
! 1855: # define GC_err_printf0(f) GC_err_puts(f)
! 1856: # define GC_err_printf1(f,a) GC_err_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
! 1857: # define GC_err_printf2(f,a,b) GC_err_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
! 1858: # define GC_err_printf3(f,a,b,c) GC_err_printf(f, (long)a, (long)b, (long)c, \
! 1859: 0l, 0l, 0l)
! 1860: # define GC_err_printf4(f,a,b,c,d) GC_err_printf(f, (long)a, (long)b, \
! 1861: (long)c, (long)d, 0l, 0l)
! 1862: # define GC_err_printf5(f,a,b,c,d,e) GC_err_printf(f, (long)a, (long)b, \
! 1863: (long)c, (long)d, \
! 1864: (long)e, 0l)
! 1865: # define GC_err_printf6(f,a,b,c,d,e,g) GC_err_printf(f, (long)a, (long)b, \
! 1866: (long)c, (long)d, \
! 1867: (long)e, (long)g)
! 1868: /* Ditto, writes to stderr. */
! 1869:
! 1870: void GC_err_puts(/* char *s */);
! 1871: /* Write s to stderr, don't buffer, don't add */
! 1872: /* newlines, don't ... */
! 1873:
! 1874:
! 1875: # ifdef GC_ASSERTIONS
! 1876: # define GC_ASSERT(expr) if(!(expr)) {\
! 1877: GC_err_printf2("Assertion failure: %s:%ld\n", \
! 1878: __FILE__, (unsigned long)__LINE__); \
! 1879: ABORT("assertion failure"); }
! 1880: # else
! 1881: # define GC_ASSERT(expr)
! 1882: # endif
! 1883:
! 1884: # endif /* GC_PRIVATE_H */
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