Annotation of OpenXM_contrib/gc/gc_priv.h, Revision 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 16, 1996 2:30 pm PST */
! 15:
! 16:
! 17: # ifndef GC_PRIVATE_H
! 18: # define GC_PRIVATE_H
! 19:
! 20: #if defined(mips) && defined(SYSTYPE_BSD) && defined(sony_news)
! 21: /* sony RISC NEWS, NEWSOS 4 */
! 22: # define BSD_TIME
! 23: /* typedef long ptrdiff_t; -- necessary on some really old systems */
! 24: #endif
! 25:
! 26: #if defined(mips) && defined(SYSTYPE_BSD43)
! 27: /* MIPS RISCOS 4 */
! 28: # define BSD_TIME
! 29: #endif
! 30:
! 31: #ifdef BSD_TIME
! 32: # include <sys/types.h>
! 33: # include <sys/time.h>
! 34: # include <sys/resource.h>
! 35: #endif /* BSD_TIME */
! 36:
! 37: # ifndef GC_H
! 38: # include "gc.h"
! 39: # endif
! 40:
! 41: typedef GC_word word;
! 42: typedef GC_signed_word signed_word;
! 43:
! 44: # ifndef CONFIG_H
! 45: # include "gcconfig.h"
! 46: # endif
! 47:
! 48: # ifndef HEADERS_H
! 49: # include "gc_hdrs.h"
! 50: # endif
! 51:
! 52: typedef int GC_bool;
! 53: # define TRUE 1
! 54: # define FALSE 0
! 55:
! 56: typedef char * ptr_t; /* A generic pointer to which we can add */
! 57: /* byte displacements. */
! 58: /* Preferably identical to caddr_t, if it */
! 59: /* exists. */
! 60:
! 61: #if defined(__STDC__)
! 62: # include <stdlib.h>
! 63: # if !(defined( sony_news ) )
! 64: # include <stddef.h>
! 65: # endif
! 66: # define VOLATILE volatile
! 67: # define CONST const
! 68: #else
! 69: # ifdef MSWIN32
! 70: # include <stdlib.h>
! 71: # endif
! 72: # define VOLATILE
! 73: # define CONST
! 74: #endif
! 75:
! 76: #ifdef AMIGA
! 77: # define GC_FAR __far
! 78: #else
! 79: # define GC_FAR
! 80: #endif
! 81:
! 82: /*********************************/
! 83: /* */
! 84: /* Definitions for conservative */
! 85: /* collector */
! 86: /* */
! 87: /*********************************/
! 88:
! 89: /*********************************/
! 90: /* */
! 91: /* Easily changeable parameters */
! 92: /* */
! 93: /*********************************/
! 94:
! 95: #define STUBBORN_ALLOC /* Define stubborn allocation primitives */
! 96: #if defined(SRC_M3) || defined(SMALL_CONFIG)
! 97: # undef STUBBORN_ALLOC
! 98: #endif
! 99:
! 100:
! 101: /* #define ALL_INTERIOR_POINTERS */
! 102: /* Forces all pointers into the interior of an */
! 103: /* object to be considered valid. Also causes the */
! 104: /* sizes of all objects to be inflated by at least */
! 105: /* one byte. This should suffice to guarantee */
! 106: /* that in the presence of a compiler that does */
! 107: /* not perform garbage-collector-unsafe */
! 108: /* optimizations, all portable, strictly ANSI */
! 109: /* conforming C programs should be safely usable */
! 110: /* with malloc replaced by GC_malloc and free */
! 111: /* calls removed. There are several disadvantages: */
! 112: /* 1. There are probably no interesting, portable, */
! 113: /* strictly ANSI conforming C programs. */
! 114: /* 2. This option makes it hard for the collector */
! 115: /* to allocate space that is not ``pointed to'' */
! 116: /* by integers, etc. Under SunOS 4.X with a */
! 117: /* statically linked libc, we empiricaly */
! 118: /* observed that it would be difficult to */
! 119: /* allocate individual objects larger than 100K. */
! 120: /* Even if only smaller objects are allocated, */
! 121: /* more swap space is likely to be needed. */
! 122: /* Fortunately, much of this will never be */
! 123: /* touched. */
! 124: /* If you can easily avoid using this option, do. */
! 125: /* If not, try to keep individual objects small. */
! 126:
! 127: #define PRINTSTATS /* Print garbage collection statistics */
! 128: /* For less verbose output, undefine in reclaim.c */
! 129:
! 130: #define PRINTTIMES /* Print the amount of time consumed by each garbage */
! 131: /* collection. */
! 132:
! 133: #define PRINTBLOCKS /* Print object sizes associated with heap blocks, */
! 134: /* whether the objects are atomic or composite, and */
! 135: /* whether or not the block was found to be empty */
! 136: /* during the reclaim phase. Typically generates */
! 137: /* about one screenful per garbage collection. */
! 138: #undef PRINTBLOCKS
! 139:
! 140: #ifdef SILENT
! 141: # ifdef PRINTSTATS
! 142: # undef PRINTSTATS
! 143: # endif
! 144: # ifdef PRINTTIMES
! 145: # undef PRINTTIMES
! 146: # endif
! 147: # ifdef PRINTNBLOCKS
! 148: # undef PRINTNBLOCKS
! 149: # endif
! 150: #endif
! 151:
! 152: #if defined(PRINTSTATS) && !defined(GATHERSTATS)
! 153: # define GATHERSTATS
! 154: #endif
! 155:
! 156: #ifdef FINALIZE_ON_DEMAND
! 157: # define GC_INVOKE_FINALIZERS()
! 158: #else
! 159: # define GC_INVOKE_FINALIZERS() (void)GC_invoke_finalizers()
! 160: #endif
! 161:
! 162: #define MERGE_SIZES /* Round up some object sizes, so that fewer distinct */
! 163: /* free lists are actually maintained. This applies */
! 164: /* only to the top level routines in misc.c, not to */
! 165: /* user generated code that calls GC_allocobj and */
! 166: /* GC_allocaobj directly. */
! 167: /* Slows down average programs slightly. May however */
! 168: /* substantially reduce fragmentation if allocation */
! 169: /* request sizes are widely scattered. */
! 170: /* May save significant amounts of space for obj_map */
! 171: /* entries. */
! 172:
! 173: #ifndef OLD_BLOCK_ALLOC
! 174: /* Macros controlling large block allocation strategy. */
! 175: # define EXACT_FIRST /* Make a complete pass through the large object */
! 176: /* free list before splitting a block */
! 177: # define PRESERVE_LAST /* Do not divide last allocated heap segment */
! 178: /* unless we would otherwise need to expand the */
! 179: /* heap. */
! 180: #endif
! 181:
! 182: /* ALIGN_DOUBLE requires MERGE_SIZES at present. */
! 183: # if defined(ALIGN_DOUBLE) && !defined(MERGE_SIZES)
! 184: # define MERGE_SIZES
! 185: # endif
! 186:
! 187: #if defined(ALL_INTERIOR_POINTERS) && !defined(DONT_ADD_BYTE_AT_END)
! 188: # define ADD_BYTE_AT_END
! 189: #endif
! 190:
! 191:
! 192: # ifndef LARGE_CONFIG
! 193: # define MINHINCR 16 /* Minimum heap increment, in blocks of HBLKSIZE */
! 194: /* Must be multiple of largest page size. */
! 195: # define MAXHINCR 512 /* Maximum heap increment, in blocks */
! 196: # else
! 197: # define MINHINCR 64
! 198: # define MAXHINCR 4096
! 199: # endif
! 200:
! 201: # define TIME_LIMIT 50 /* We try to keep pause times from exceeding */
! 202: /* this by much. In milliseconds. */
! 203:
! 204: # define BL_LIMIT GC_black_list_spacing
! 205: /* If we need a block of N bytes, and we have */
! 206: /* a block of N + BL_LIMIT bytes available, */
! 207: /* and N > BL_LIMIT, */
! 208: /* but all possible positions in it are */
! 209: /* blacklisted, we just use it anyway (and */
! 210: /* print a warning, if warnings are enabled). */
! 211: /* This risks subsequently leaking the block */
! 212: /* due to a false reference. But not using */
! 213: /* the block risks unreasonable immediate */
! 214: /* heap growth. */
! 215:
! 216: /*********************************/
! 217: /* */
! 218: /* Stack saving for debugging */
! 219: /* */
! 220: /*********************************/
! 221:
! 222: #ifdef SAVE_CALL_CHAIN
! 223:
! 224: /*
! 225: * Number of frames and arguments to save in objects allocated by
! 226: * debugging allocator.
! 227: */
! 228: # define NFRAMES 6 /* Number of frames to save. Even for */
! 229: /* alignment reasons. */
! 230: # define NARGS 2 /* Mumber of arguments to save for each call. */
! 231:
! 232: # define NEED_CALLINFO
! 233:
! 234: /* Fill in the pc and argument information for up to NFRAMES of my */
! 235: /* callers. Ignore my frame and my callers frame. */
! 236: void GC_save_callers (/* struct callinfo info[NFRAMES] */);
! 237:
! 238: void GC_print_callers (/* struct callinfo info[NFRAMES] */);
! 239:
! 240: #else
! 241:
! 242: # ifdef GC_ADD_CALLER
! 243: # define NFRAMES 1
! 244: # define NARGS 0
! 245: # define NEED_CALLINFO
! 246: # endif
! 247:
! 248: #endif
! 249:
! 250: #ifdef NEED_CALLINFO
! 251: struct callinfo {
! 252: word ci_pc;
! 253: # if NARGS > 0
! 254: word ci_arg[NARGS]; /* bit-wise complement to avoid retention */
! 255: # endif
! 256: # if defined(ALIGN_DOUBLE) && (NFRAMES * (NARGS + 1)) % 2 == 1
! 257: /* Likely alignment problem. */
! 258: word ci_dummy;
! 259: # endif
! 260: };
! 261: #endif
! 262:
! 263:
! 264: /*********************************/
! 265: /* */
! 266: /* OS interface routines */
! 267: /* */
! 268: /*********************************/
! 269:
! 270: #ifdef BSD_TIME
! 271: # undef CLOCK_TYPE
! 272: # undef GET_TIME
! 273: # undef MS_TIME_DIFF
! 274: # define CLOCK_TYPE struct timeval
! 275: # define GET_TIME(x) { struct rusage rusage; \
! 276: getrusage (RUSAGE_SELF, &rusage); \
! 277: x = rusage.ru_utime; }
! 278: # define MS_TIME_DIFF(a,b) ((double) (a.tv_sec - b.tv_sec) * 1000.0 \
! 279: + (double) (a.tv_usec - b.tv_usec) / 1000.0)
! 280: #else /* !BSD_TIME */
! 281: # include <time.h>
! 282: # if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4)
! 283: clock_t clock(); /* Not in time.h, where it belongs */
! 284: # endif
! 285: # if defined(FREEBSD) && !defined(CLOCKS_PER_SEC)
! 286: # include <machine/limits.h>
! 287: # define CLOCKS_PER_SEC CLK_TCK
! 288: # endif
! 289: # if !defined(CLOCKS_PER_SEC)
! 290: # define CLOCKS_PER_SEC 1000000
! 291: /*
! 292: * This is technically a bug in the implementation. ANSI requires that
! 293: * CLOCKS_PER_SEC be defined. But at least under SunOS4.1.1, it isn't.
! 294: * Also note that the combination of ANSI C and POSIX is incredibly gross
! 295: * here. The type clock_t is used by both clock() and times(). But on
! 296: * some machines these use different notions of a clock tick, CLOCKS_PER_SEC
! 297: * seems to apply only to clock. Hence we use it here. On many machines,
! 298: * including SunOS, clock actually uses units of microseconds (which are
! 299: * not really clock ticks).
! 300: */
! 301: # endif
! 302: # define CLOCK_TYPE clock_t
! 303: # define GET_TIME(x) x = clock()
! 304: # define MS_TIME_DIFF(a,b) ((unsigned long) \
! 305: (1000.0*(double)((a)-(b))/(double)CLOCKS_PER_SEC))
! 306: #endif /* !BSD_TIME */
! 307:
! 308: /* We use bzero and bcopy internally. They may not be available. */
! 309: # if defined(SPARC) && defined(SUNOS4)
! 310: # define BCOPY_EXISTS
! 311: # endif
! 312: # if defined(M68K) && defined(AMIGA)
! 313: # define BCOPY_EXISTS
! 314: # endif
! 315: # if defined(M68K) && defined(NEXT)
! 316: # define BCOPY_EXISTS
! 317: # endif
! 318: # if defined(VAX)
! 319: # define BCOPY_EXISTS
! 320: # endif
! 321: # if defined(AMIGA)
! 322: # include <string.h>
! 323: # define BCOPY_EXISTS
! 324: # endif
! 325:
! 326: # ifndef BCOPY_EXISTS
! 327: # include <string.h>
! 328: # define BCOPY(x,y,n) memcpy(y, x, (size_t)(n))
! 329: # define BZERO(x,n) memset(x, 0, (size_t)(n))
! 330: # else
! 331: # define BCOPY(x,y,n) bcopy((char *)(x),(char *)(y),(int)(n))
! 332: # define BZERO(x,n) bzero((char *)(x),(int)(n))
! 333: # endif
! 334:
! 335: /* HBLKSIZE aligned allocation. 0 is taken to mean failure */
! 336: /* space is assumed to be cleared. */
! 337: /* In the case os USE_MMAP, the argument must also be a */
! 338: /* physical page size. */
! 339: /* GET_MEM is currently not assumed to retrieve 0 filled space, */
! 340: /* though we should perhaps take advantage of the case in which */
! 341: /* does. */
! 342: # ifdef PCR
! 343: char * real_malloc();
! 344: # define GET_MEM(bytes) HBLKPTR(real_malloc((size_t)bytes + GC_page_size) \
! 345: + GC_page_size-1)
! 346: # else
! 347: # ifdef OS2
! 348: void * os2_alloc(size_t bytes);
! 349: # define GET_MEM(bytes) HBLKPTR((ptr_t)os2_alloc((size_t)bytes \
! 350: + GC_page_size) \
! 351: + GC_page_size-1)
! 352: # else
! 353: # if defined(AMIGA) || defined(NEXT) || defined(DOS4GW)
! 354: # define GET_MEM(bytes) HBLKPTR((size_t) \
! 355: calloc(1, (size_t)bytes + GC_page_size) \
! 356: + GC_page_size-1)
! 357: # else
! 358: # ifdef MSWIN32
! 359: extern ptr_t GC_win32_get_mem();
! 360: # define GET_MEM(bytes) (struct hblk *)GC_win32_get_mem(bytes)
! 361: # else
! 362: # ifdef MACOS
! 363: # if defined(USE_TEMPORARY_MEMORY)
! 364: extern Ptr GC_MacTemporaryNewPtr(size_t size,
! 365: Boolean clearMemory);
! 366: # define GET_MEM(bytes) HBLKPTR( \
! 367: GC_MacTemporaryNewPtr(bytes + GC_page_size, true) \
! 368: + GC_page_size-1)
! 369: # else
! 370: # define GET_MEM(bytes) HBLKPTR( \
! 371: NewPtrClear(bytes + GC_page_size) + GC_page_size-1)
! 372: # endif
! 373: # else
! 374: extern ptr_t GC_unix_get_mem();
! 375: # define GET_MEM(bytes) (struct hblk *)GC_unix_get_mem(bytes)
! 376: # endif
! 377: # endif
! 378: # endif
! 379: # endif
! 380: # endif
! 381:
! 382: /*
! 383: * Mutual exclusion between allocator/collector routines.
! 384: * Needed if there is more than one allocator thread.
! 385: * FASTLOCK() is assumed to try to acquire the lock in a cheap and
! 386: * dirty way that is acceptable for a few instructions, e.g. by
! 387: * inhibiting preemption. This is assumed to have succeeded only
! 388: * if a subsequent call to FASTLOCK_SUCCEEDED() returns TRUE.
! 389: * FASTUNLOCK() is called whether or not FASTLOCK_SUCCEEDED().
! 390: * If signals cannot be tolerated with the FASTLOCK held, then
! 391: * FASTLOCK should disable signals. The code executed under
! 392: * FASTLOCK is otherwise immune to interruption, provided it is
! 393: * not restarted.
! 394: * DCL_LOCK_STATE declares any local variables needed by LOCK and UNLOCK
! 395: * and/or DISABLE_SIGNALS and ENABLE_SIGNALS and/or FASTLOCK.
! 396: * (There is currently no equivalent for FASTLOCK.)
! 397: */
! 398: # ifdef THREADS
! 399: # ifdef PCR_OBSOLETE /* Faster, but broken with multiple lwp's */
! 400: # include "th/PCR_Th.h"
! 401: # include "th/PCR_ThCrSec.h"
! 402: extern struct PCR_Th_MLRep GC_allocate_ml;
! 403: # define DCL_LOCK_STATE PCR_sigset_t GC_old_sig_mask
! 404: # define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml)
! 405: # define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml)
! 406: # define FASTLOCK() PCR_ThCrSec_EnterSys()
! 407: /* Here we cheat (a lot): */
! 408: # define FASTLOCK_SUCCEEDED() (*(int *)(&GC_allocate_ml) == 0)
! 409: /* TRUE if nobody currently holds the lock */
! 410: # define FASTUNLOCK() PCR_ThCrSec_ExitSys()
! 411: # endif
! 412: # ifdef PCR
! 413: # include <base/PCR_Base.h>
! 414: # include <th/PCR_Th.h>
! 415: extern PCR_Th_ML GC_allocate_ml;
! 416: # define DCL_LOCK_STATE \
! 417: PCR_ERes GC_fastLockRes; PCR_sigset_t GC_old_sig_mask
! 418: # define LOCK() PCR_Th_ML_Acquire(&GC_allocate_ml)
! 419: # define UNLOCK() PCR_Th_ML_Release(&GC_allocate_ml)
! 420: # define FASTLOCK() (GC_fastLockRes = PCR_Th_ML_Try(&GC_allocate_ml))
! 421: # define FASTLOCK_SUCCEEDED() (GC_fastLockRes == PCR_ERes_okay)
! 422: # define FASTUNLOCK() {\
! 423: if( FASTLOCK_SUCCEEDED() ) PCR_Th_ML_Release(&GC_allocate_ml); }
! 424: # endif
! 425: # ifdef SRC_M3
! 426: extern word RT0u__inCritical;
! 427: # define LOCK() RT0u__inCritical++
! 428: # define UNLOCK() RT0u__inCritical--
! 429: # endif
! 430: # ifdef SOLARIS_THREADS
! 431: # include <thread.h>
! 432: # include <signal.h>
! 433: extern mutex_t GC_allocate_ml;
! 434: # define LOCK() mutex_lock(&GC_allocate_ml);
! 435: # define UNLOCK() mutex_unlock(&GC_allocate_ml);
! 436: # endif
! 437: # ifdef LINUX_THREADS
! 438: # include <pthread.h>
! 439: # ifdef __i386__
! 440: inline static int GC_test_and_set(volatile unsigned int *addr) {
! 441: int oldval;
! 442: /* Note: the "xchg" instruction does not need a "lock" prefix */
! 443: __asm__ __volatile__("xchgl %0, %1"
! 444: : "=r"(oldval), "=m"(*(addr))
! 445: : "0"(1), "m"(*(addr)));
! 446: return oldval;
! 447: }
! 448: # else
! 449: -- > Need implementation of GC_test_and_set()
! 450: # endif
! 451: # define GC_clear(addr) (*(addr) = 0)
! 452:
! 453: extern volatile unsigned int GC_allocate_lock;
! 454: /* This is not a mutex because mutexes that obey the (optional) */
! 455: /* POSIX scheduling rules are subject to convoys in high contention */
! 456: /* applications. This is basically a spin lock. */
! 457: extern pthread_t GC_lock_holder;
! 458: extern void GC_lock(void);
! 459: /* Allocation lock holder. Only set if acquired by client through */
! 460: /* GC_call_with_alloc_lock. */
! 461: # define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
! 462: # define NO_THREAD (pthread_t)(-1)
! 463: # define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
! 464: # define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
! 465: # ifdef UNDEFINED
! 466: # define LOCK() pthread_mutex_lock(&GC_allocate_ml)
! 467: # define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
! 468: # else
! 469: # define LOCK() \
! 470: { if (GC_test_and_set(&GC_allocate_lock)) GC_lock(); }
! 471: # define UNLOCK() \
! 472: GC_clear(&GC_allocate_lock)
! 473: # endif
! 474: extern GC_bool GC_collecting;
! 475: # define ENTER_GC() \
! 476: { \
! 477: GC_collecting = 1; \
! 478: }
! 479: # define EXIT_GC() GC_collecting = 0;
! 480: # endif /* LINUX_THREADS */
! 481: # if defined(IRIX_THREADS) || defined(IRIX_JDK_THREADS)
! 482: # include <pthread.h>
! 483: # include <mutex.h>
! 484:
! 485: # if __mips < 3 || !(defined (_ABIN32) || defined(_ABI64)) \
! 486: || !defined(_COMPILER_VERSION) || _COMPILER_VERSION < 700
! 487: # define GC_test_and_set(addr, v) test_and_set(addr,v)
! 488: # else
! 489: # define GC_test_and_set(addr, v) __test_and_set(addr,v)
! 490: # endif
! 491: extern unsigned long GC_allocate_lock;
! 492: /* This is not a mutex because mutexes that obey the (optional) */
! 493: /* POSIX scheduling rules are subject to convoys in high contention */
! 494: /* applications. This is basically a spin lock. */
! 495: extern pthread_t GC_lock_holder;
! 496: extern void GC_lock(void);
! 497: /* Allocation lock holder. Only set if acquired by client through */
! 498: /* GC_call_with_alloc_lock. */
! 499: # define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
! 500: # define NO_THREAD (pthread_t)(-1)
! 501: # define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
! 502: # define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
! 503: # ifdef UNDEFINED
! 504: # define LOCK() pthread_mutex_lock(&GC_allocate_ml)
! 505: # define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
! 506: # else
! 507: # define LOCK() { if (GC_test_and_set(&GC_allocate_lock, 1)) GC_lock(); }
! 508: # if __mips >= 3 && (defined (_ABIN32) || defined(_ABI64)) \
! 509: && defined(_COMPILER_VERSION) && _COMPILER_VERSION >= 700
! 510: # define UNLOCK() __lock_release(&GC_allocate_lock)
! 511: # else
! 512: /* The function call in the following should prevent the */
! 513: /* compiler from moving assignments to below the UNLOCK. */
! 514: /* This is probably not necessary for ucode or gcc 2.8. */
! 515: /* It may be necessary for Ragnarok and future gcc */
! 516: /* versions. */
! 517: # define UNLOCK() { GC_noop1(&GC_allocate_lock); \
! 518: *(volatile unsigned long *)(&GC_allocate_lock) = 0; }
! 519: # endif
! 520: # endif
! 521: extern GC_bool GC_collecting;
! 522: # define ENTER_GC() \
! 523: { \
! 524: GC_collecting = 1; \
! 525: }
! 526: # define EXIT_GC() GC_collecting = 0;
! 527: # endif /* IRIX_THREADS || IRIX_JDK_THREADS */
! 528: # ifdef WIN32_THREADS
! 529: # include <windows.h>
! 530: GC_API CRITICAL_SECTION GC_allocate_ml;
! 531: # define LOCK() EnterCriticalSection(&GC_allocate_ml);
! 532: # define UNLOCK() LeaveCriticalSection(&GC_allocate_ml);
! 533: # endif
! 534: # ifndef SET_LOCK_HOLDER
! 535: # define SET_LOCK_HOLDER()
! 536: # define UNSET_LOCK_HOLDER()
! 537: # define I_HOLD_LOCK() FALSE
! 538: /* Used on platforms were locks can be reacquired, */
! 539: /* so it doesn't matter if we lie. */
! 540: # endif
! 541: # else
! 542: # define LOCK()
! 543: # define UNLOCK()
! 544: # endif
! 545: # ifndef SET_LOCK_HOLDER
! 546: # define SET_LOCK_HOLDER()
! 547: # define UNSET_LOCK_HOLDER()
! 548: # define I_HOLD_LOCK() FALSE
! 549: /* Used on platforms were locks can be reacquired, */
! 550: /* so it doesn't matter if we lie. */
! 551: # endif
! 552: # ifndef ENTER_GC
! 553: # define ENTER_GC()
! 554: # define EXIT_GC()
! 555: # endif
! 556:
! 557: # ifndef DCL_LOCK_STATE
! 558: # define DCL_LOCK_STATE
! 559: # endif
! 560: # ifndef FASTLOCK
! 561: # define FASTLOCK() LOCK()
! 562: # define FASTLOCK_SUCCEEDED() TRUE
! 563: # define FASTUNLOCK() UNLOCK()
! 564: # endif
! 565:
! 566: /* Delay any interrupts or signals that may abort this thread. Data */
! 567: /* structures are in a consistent state outside this pair of calls. */
! 568: /* ANSI C allows both to be empty (though the standard isn't very */
! 569: /* clear on that point). Standard malloc implementations are usually */
! 570: /* neither interruptable nor thread-safe, and thus correspond to */
! 571: /* empty definitions. */
! 572: # ifdef PCR
! 573: # define DISABLE_SIGNALS() \
! 574: PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask)
! 575: # define ENABLE_SIGNALS() \
! 576: PCR_Th_SetSigMask(&GC_old_sig_mask, NIL)
! 577: # else
! 578: # if defined(SRC_M3) || defined(AMIGA) || defined(SOLARIS_THREADS) \
! 579: || defined(MSWIN32) || defined(MACOS) || defined(DJGPP) \
! 580: || defined(NO_SIGNALS) || defined(IRIX_THREADS) \
! 581: || defined(IRIX_JDK_THREADS) || defined(LINUX_THREADS)
! 582: /* Also useful for debugging. */
! 583: /* Should probably use thr_sigsetmask for SOLARIS_THREADS. */
! 584: # define DISABLE_SIGNALS()
! 585: # define ENABLE_SIGNALS()
! 586: # else
! 587: # define DISABLE_SIGNALS() GC_disable_signals()
! 588: void GC_disable_signals();
! 589: # define ENABLE_SIGNALS() GC_enable_signals()
! 590: void GC_enable_signals();
! 591: # endif
! 592: # endif
! 593:
! 594: /*
! 595: * Stop and restart mutator threads.
! 596: */
! 597: # ifdef PCR
! 598: # include "th/PCR_ThCtl.h"
! 599: # define STOP_WORLD() \
! 600: PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_stopNormal, \
! 601: PCR_allSigsBlocked, \
! 602: PCR_waitForever)
! 603: # define START_WORLD() \
! 604: PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_null, \
! 605: PCR_allSigsBlocked, \
! 606: PCR_waitForever);
! 607: # else
! 608: # if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
! 609: || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
! 610: || defined(IRIX_JDK_THREADS)
! 611: void GC_stop_world();
! 612: void GC_start_world();
! 613: # define STOP_WORLD() GC_stop_world()
! 614: # define START_WORLD() GC_start_world()
! 615: # else
! 616: # define STOP_WORLD()
! 617: # define START_WORLD()
! 618: # endif
! 619: # endif
! 620:
! 621: /* Abandon ship */
! 622: # ifdef PCR
! 623: # define ABORT(s) PCR_Base_Panic(s)
! 624: # else
! 625: # ifdef SMALL_CONFIG
! 626: # define ABORT(msg) abort();
! 627: # else
! 628: GC_API void GC_abort();
! 629: # define ABORT(msg) GC_abort(msg);
! 630: # endif
! 631: # endif
! 632:
! 633: /* Exit abnormally, but without making a mess (e.g. out of memory) */
! 634: # ifdef PCR
! 635: # define EXIT() PCR_Base_Exit(1,PCR_waitForever)
! 636: # else
! 637: # define EXIT() (void)exit(1)
! 638: # endif
! 639:
! 640: /* Print warning message, e.g. almost out of memory. */
! 641: # define WARN(msg,arg) (*GC_current_warn_proc)(msg, (GC_word)(arg))
! 642: extern GC_warn_proc GC_current_warn_proc;
! 643:
! 644: /*********************************/
! 645: /* */
! 646: /* Word-size-dependent defines */
! 647: /* */
! 648: /*********************************/
! 649:
! 650: #if CPP_WORDSZ == 32
! 651: # define WORDS_TO_BYTES(x) ((x)<<2)
! 652: # define BYTES_TO_WORDS(x) ((x)>>2)
! 653: # define LOGWL ((word)5) /* log[2] of CPP_WORDSZ */
! 654: # define modWORDSZ(n) ((n) & 0x1f) /* n mod size of word */
! 655: # if ALIGNMENT != 4
! 656: # define UNALIGNED
! 657: # endif
! 658: #endif
! 659:
! 660: #if CPP_WORDSZ == 64
! 661: # define WORDS_TO_BYTES(x) ((x)<<3)
! 662: # define BYTES_TO_WORDS(x) ((x)>>3)
! 663: # define LOGWL ((word)6) /* log[2] of CPP_WORDSZ */
! 664: # define modWORDSZ(n) ((n) & 0x3f) /* n mod size of word */
! 665: # if ALIGNMENT != 8
! 666: # define UNALIGNED
! 667: # endif
! 668: #endif
! 669:
! 670: #define WORDSZ ((word)CPP_WORDSZ)
! 671: #define SIGNB ((word)1 << (WORDSZ-1))
! 672: #define BYTES_PER_WORD ((word)(sizeof (word)))
! 673: #define ONES ((word)(-1))
! 674: #define divWORDSZ(n) ((n) >> LOGWL) /* divide n by size of word */
! 675:
! 676: /*********************/
! 677: /* */
! 678: /* Size Parameters */
! 679: /* */
! 680: /*********************/
! 681:
! 682: /* heap block size, bytes. Should be power of 2 */
! 683:
! 684: #ifndef HBLKSIZE
! 685: # ifdef SMALL_CONFIG
! 686: # define CPP_LOG_HBLKSIZE 10
! 687: # else
! 688: # if CPP_WORDSZ == 32
! 689: # define CPP_LOG_HBLKSIZE 12
! 690: # else
! 691: # define CPP_LOG_HBLKSIZE 13
! 692: # endif
! 693: # endif
! 694: #else
! 695: # if HBLKSIZE == 512
! 696: # define CPP_LOG_HBLKSIZE 9
! 697: # endif
! 698: # if HBLKSIZE == 1024
! 699: # define CPP_LOG_HBLKSIZE 10
! 700: # endif
! 701: # if HBLKSIZE == 2048
! 702: # define CPP_LOG_HBLKSIZE 11
! 703: # endif
! 704: # if HBLKSIZE == 4096
! 705: # define CPP_LOG_HBLKSIZE 12
! 706: # endif
! 707: # if HBLKSIZE == 8192
! 708: # define CPP_LOG_HBLKSIZE 13
! 709: # endif
! 710: # if HBLKSIZE == 16384
! 711: # define CPP_LOG_HBLKSIZE 14
! 712: # endif
! 713: # ifndef CPP_LOG_HBLKSIZE
! 714: --> fix HBLKSIZE
! 715: # endif
! 716: # undef HBLKSIZE
! 717: #endif
! 718: # define CPP_HBLKSIZE (1 << CPP_LOG_HBLKSIZE)
! 719: # define LOG_HBLKSIZE ((word)CPP_LOG_HBLKSIZE)
! 720: # define HBLKSIZE ((word)CPP_HBLKSIZE)
! 721:
! 722:
! 723: /* max size objects supported by freelist (larger objects may be */
! 724: /* allocated, but less efficiently) */
! 725:
! 726: #define CPP_MAXOBJSZ BYTES_TO_WORDS(CPP_HBLKSIZE/2)
! 727: #define MAXOBJSZ ((word)CPP_MAXOBJSZ)
! 728:
! 729: # define divHBLKSZ(n) ((n) >> LOG_HBLKSIZE)
! 730:
! 731: # define HBLK_PTR_DIFF(p,q) divHBLKSZ((ptr_t)p - (ptr_t)q)
! 732: /* Equivalent to subtracting 2 hblk pointers. */
! 733: /* We do it this way because a compiler should */
! 734: /* find it hard to use an integer division */
! 735: /* instead of a shift. The bundled SunOS 4.1 */
! 736: /* o.w. sometimes pessimizes the subtraction to */
! 737: /* involve a call to .div. */
! 738:
! 739: # define modHBLKSZ(n) ((n) & (HBLKSIZE-1))
! 740:
! 741: # define HBLKPTR(objptr) ((struct hblk *)(((word) (objptr)) & ~(HBLKSIZE-1)))
! 742:
! 743: # define HBLKDISPL(objptr) (((word) (objptr)) & (HBLKSIZE-1))
! 744:
! 745: /* Round up byte allocation requests to integral number of words, etc. */
! 746: # ifdef ADD_BYTE_AT_END
! 747: # define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1))
! 748: # ifdef ALIGN_DOUBLE
! 749: # define ALIGNED_WORDS(n) (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2)) & ~1)
! 750: # else
! 751: # define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
! 752: # endif
! 753: # define SMALL_OBJ(bytes) ((bytes) < WORDS_TO_BYTES(MAXOBJSZ))
! 754: # define ADD_SLOP(bytes) ((bytes)+1)
! 755: # else
! 756: # define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + (WORDS_TO_BYTES(1) - 1))
! 757: # ifdef ALIGN_DOUBLE
! 758: # define ALIGNED_WORDS(n) \
! 759: (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2) - 1) & ~1)
! 760: # else
! 761: # define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
! 762: # endif
! 763: # define SMALL_OBJ(bytes) ((bytes) <= WORDS_TO_BYTES(MAXOBJSZ))
! 764: # define ADD_SLOP(bytes) (bytes)
! 765: # endif
! 766:
! 767:
! 768: /*
! 769: * Hash table representation of sets of pages. This assumes it is
! 770: * OK to add spurious entries to sets.
! 771: * Used by black-listing code, and perhaps by dirty bit maintenance code.
! 772: */
! 773:
! 774: # ifdef LARGE_CONFIG
! 775: # define LOG_PHT_ENTRIES 17
! 776: # else
! 777: # define LOG_PHT_ENTRIES 14 /* Collisions are likely if heap grows */
! 778: /* to more than 16K hblks = 64MB. */
! 779: /* Each hash table occupies 2K bytes. */
! 780: # endif
! 781: # define PHT_ENTRIES ((word)1 << LOG_PHT_ENTRIES)
! 782: # define PHT_SIZE (PHT_ENTRIES >> LOGWL)
! 783: typedef word page_hash_table[PHT_SIZE];
! 784:
! 785: # define PHT_HASH(addr) ((((word)(addr)) >> LOG_HBLKSIZE) & (PHT_ENTRIES - 1))
! 786:
! 787: # define get_pht_entry_from_index(bl, index) \
! 788: (((bl)[divWORDSZ(index)] >> modWORDSZ(index)) & 1)
! 789: # define set_pht_entry_from_index(bl, index) \
! 790: (bl)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index)
! 791: # define clear_pht_entry_from_index(bl, index) \
! 792: (bl)[divWORDSZ(index)] &= ~((word)1 << modWORDSZ(index))
! 793:
! 794:
! 795:
! 796: /********************************************/
! 797: /* */
! 798: /* H e a p B l o c k s */
! 799: /* */
! 800: /********************************************/
! 801:
! 802: /* heap block header */
! 803: #define HBLKMASK (HBLKSIZE-1)
! 804:
! 805: #define BITS_PER_HBLK (HBLKSIZE * 8)
! 806:
! 807: #define MARK_BITS_PER_HBLK (BITS_PER_HBLK/CPP_WORDSZ)
! 808: /* upper bound */
! 809: /* We allocate 1 bit/word. Only the first word */
! 810: /* in each object is actually marked. */
! 811:
! 812: # ifdef ALIGN_DOUBLE
! 813: # define MARK_BITS_SZ (((MARK_BITS_PER_HBLK + 2*CPP_WORDSZ - 1) \
! 814: / (2*CPP_WORDSZ))*2)
! 815: # else
! 816: # define MARK_BITS_SZ ((MARK_BITS_PER_HBLK + CPP_WORDSZ - 1)/CPP_WORDSZ)
! 817: # endif
! 818: /* Upper bound on number of mark words per heap block */
! 819:
! 820: struct hblkhdr {
! 821: word hb_sz; /* If in use, size in words, of objects in the block. */
! 822: /* if free, the size in bytes of the whole block */
! 823: struct hblk * hb_next; /* Link field for hblk free list */
! 824: /* and for lists of chunks waiting to be */
! 825: /* reclaimed. */
! 826: word hb_descr; /* object descriptor for marking. See */
! 827: /* mark.h. */
! 828: char* hb_map; /* A pointer to a pointer validity map of the block. */
! 829: /* See GC_obj_map. */
! 830: /* Valid for all blocks with headers. */
! 831: /* Free blocks point to GC_invalid_map. */
! 832: unsigned char hb_obj_kind;
! 833: /* Kind of objects in the block. Each kind */
! 834: /* identifies a mark procedure and a set of */
! 835: /* list headers. Sometimes called regions. */
! 836: unsigned char hb_flags;
! 837: # define IGNORE_OFF_PAGE 1 /* Ignore pointers that do not */
! 838: /* point to the first page of */
! 839: /* this object. */
! 840: unsigned short hb_last_reclaimed;
! 841: /* Value of GC_gc_no when block was */
! 842: /* last allocated or swept. May wrap. */
! 843: word hb_marks[MARK_BITS_SZ];
! 844: /* Bit i in the array refers to the */
! 845: /* object starting at the ith word (header */
! 846: /* INCLUDED) in the heap block. */
! 847: /* The lsb of word 0 is numbered 0. */
! 848: };
! 849:
! 850: /* heap block body */
! 851:
! 852: # define DISCARD_WORDS 0
! 853: /* Number of words to be dropped at the beginning of each block */
! 854: /* Must be a multiple of WORDSZ. May reasonably be nonzero */
! 855: /* on machines that don't guarantee longword alignment of */
! 856: /* pointers, so that the number of false hits is minimized. */
! 857: /* 0 and WORDSZ are probably the only reasonable values. */
! 858:
! 859: # define BODY_SZ ((HBLKSIZE-WORDS_TO_BYTES(DISCARD_WORDS))/sizeof(word))
! 860:
! 861: struct hblk {
! 862: # if (DISCARD_WORDS != 0)
! 863: word garbage[DISCARD_WORDS];
! 864: # endif
! 865: word hb_body[BODY_SZ];
! 866: };
! 867:
! 868: # define HDR_WORDS ((word)DISCARD_WORDS)
! 869: # define HDR_BYTES ((word)WORDS_TO_BYTES(DISCARD_WORDS))
! 870:
! 871: # define OBJ_SZ_TO_BLOCKS(sz) \
! 872: divHBLKSZ(HDR_BYTES + WORDS_TO_BYTES(sz) + HBLKSIZE-1)
! 873: /* Size of block (in units of HBLKSIZE) needed to hold objects of */
! 874: /* given sz (in words). */
! 875:
! 876: /* Object free list link */
! 877: # define obj_link(p) (*(ptr_t *)(p))
! 878:
! 879: /* The type of mark procedures. This really belongs in gc_mark.h. */
! 880: /* But we put it here, so that we can avoid scanning the mark proc */
! 881: /* table. */
! 882: typedef struct ms_entry * (*mark_proc)(/* word * addr, mark_stack_ptr,
! 883: mark_stack_limit, env */);
! 884: # define LOG_MAX_MARK_PROCS 6
! 885: # define MAX_MARK_PROCS (1 << LOG_MAX_MARK_PROCS)
! 886:
! 887: /* Root sets. Logically private to mark_rts.c. But we don't want the */
! 888: /* tables scanned, so we put them here. */
! 889: /* MAX_ROOT_SETS is the maximum number of ranges that can be */
! 890: /* registered as static roots. */
! 891: # ifdef LARGE_CONFIG
! 892: # define MAX_ROOT_SETS 4096
! 893: # else
! 894: # ifdef PCR
! 895: # define MAX_ROOT_SETS 1024
! 896: # else
! 897: # ifdef MSWIN32
! 898: # define MAX_ROOT_SETS 512
! 899: /* Under NT, we add only written pages, which can result */
! 900: /* in many small root sets. */
! 901: # else
! 902: # define MAX_ROOT_SETS 64
! 903: # endif
! 904: # endif
! 905: # endif
! 906:
! 907: # define MAX_EXCLUSIONS (MAX_ROOT_SETS/4)
! 908: /* Maximum number of segments that can be excluded from root sets. */
! 909:
! 910: /*
! 911: * Data structure for excluded static roots.
! 912: */
! 913: struct exclusion {
! 914: ptr_t e_start;
! 915: ptr_t e_end;
! 916: };
! 917:
! 918: /* Data structure for list of root sets. */
! 919: /* We keep a hash table, so that we can filter out duplicate additions. */
! 920: /* Under Win32, we need to do a better job of filtering overlaps, so */
! 921: /* we resort to sequential search, and pay the price. */
! 922: struct roots {
! 923: ptr_t r_start;
! 924: ptr_t r_end;
! 925: # ifndef MSWIN32
! 926: struct roots * r_next;
! 927: # endif
! 928: GC_bool r_tmp;
! 929: /* Delete before registering new dynamic libraries */
! 930: };
! 931:
! 932: #ifndef MSWIN32
! 933: /* Size of hash table index to roots. */
! 934: # define LOG_RT_SIZE 6
! 935: # define RT_SIZE (1 << LOG_RT_SIZE) /* Power of 2, may be != MAX_ROOT_SETS */
! 936: #endif
! 937:
! 938: /* Lists of all heap blocks and free lists */
! 939: /* as well as other random data structures */
! 940: /* that should not be scanned by the */
! 941: /* collector. */
! 942: /* These are grouped together in a struct */
! 943: /* so that they can be easily skipped by the */
! 944: /* GC_mark routine. */
! 945: /* The ordering is weird to make GC_malloc */
! 946: /* faster by keeping the important fields */
! 947: /* sufficiently close together that a */
! 948: /* single load of a base register will do. */
! 949: /* Scalars that could easily appear to */
! 950: /* be pointers are also put here. */
! 951: /* The main fields should precede any */
! 952: /* conditionally included fields, so that */
! 953: /* gc_inl.h will work even if a different set */
! 954: /* of macros is defined when the client is */
! 955: /* compiled. */
! 956:
! 957: struct _GC_arrays {
! 958: word _heapsize;
! 959: word _max_heapsize;
! 960: ptr_t _last_heap_addr;
! 961: ptr_t _prev_heap_addr;
! 962: word _words_allocd_before_gc;
! 963: /* Number of words allocated before this */
! 964: /* collection cycle. */
! 965: word _words_allocd;
! 966: /* Number of words allocated during this collection cycle */
! 967: word _words_wasted;
! 968: /* Number of words wasted due to internal fragmentation */
! 969: /* in large objects, or due to dropping blacklisted */
! 970: /* blocks, since last gc. Approximate. */
! 971: word _words_finalized;
! 972: /* Approximate number of words in objects (and headers) */
! 973: /* That became ready for finalization in the last */
! 974: /* collection. */
! 975: word _non_gc_bytes_at_gc;
! 976: /* Number of explicitly managed bytes of storage */
! 977: /* at last collection. */
! 978: word _mem_freed;
! 979: /* Number of explicitly deallocated words of memory */
! 980: /* since last collection. */
! 981: mark_proc _mark_procs[MAX_MARK_PROCS];
! 982: /* Table of user-defined mark procedures. There is */
! 983: /* a small number of these, which can be referenced */
! 984: /* by DS_PROC mark descriptors. See gc_mark.h. */
! 985: ptr_t _objfreelist[MAXOBJSZ+1];
! 986: /* free list for objects */
! 987: ptr_t _aobjfreelist[MAXOBJSZ+1];
! 988: /* free list for atomic objs */
! 989:
! 990: ptr_t _uobjfreelist[MAXOBJSZ+1];
! 991: /* uncollectable but traced objs */
! 992: /* objects on this and auobjfreelist */
! 993: /* are always marked, except during */
! 994: /* garbage collections. */
! 995: # ifdef ATOMIC_UNCOLLECTABLE
! 996: ptr_t _auobjfreelist[MAXOBJSZ+1];
! 997: # endif
! 998: /* uncollectable but traced objs */
! 999:
! 1000: # ifdef GATHERSTATS
! 1001: word _composite_in_use;
! 1002: /* Number of words in accessible composite */
! 1003: /* objects. */
! 1004: word _atomic_in_use;
! 1005: /* Number of words in accessible atomic */
! 1006: /* objects. */
! 1007: # endif
! 1008: # ifdef MERGE_SIZES
! 1009: unsigned _size_map[WORDS_TO_BYTES(MAXOBJSZ+1)];
! 1010: /* Number of words to allocate for a given allocation request in */
! 1011: /* bytes. */
! 1012: # endif
! 1013:
! 1014: # ifdef STUBBORN_ALLOC
! 1015: ptr_t _sobjfreelist[MAXOBJSZ+1];
! 1016: # endif
! 1017: /* free list for immutable objects */
! 1018: ptr_t _obj_map[MAXOBJSZ+1];
! 1019: /* If not NIL, then a pointer to a map of valid */
! 1020: /* object addresses. _obj_map[sz][i] is j if the */
! 1021: /* address block_start+i is a valid pointer */
! 1022: /* to an object at */
! 1023: /* block_start+i&~3 - WORDS_TO_BYTES(j). */
! 1024: /* (If ALL_INTERIOR_POINTERS is defined, then */
! 1025: /* instead ((short *)(hbh_map[sz])[i] is j if */
! 1026: /* block_start+WORDS_TO_BYTES(i) is in the */
! 1027: /* interior of an object starting at */
! 1028: /* block_start+WORDS_TO_BYTES(i-j)). */
! 1029: /* It is OBJ_INVALID if */
! 1030: /* block_start+WORDS_TO_BYTES(i) is not */
! 1031: /* valid as a pointer to an object. */
! 1032: /* We assume all values of j <= OBJ_INVALID. */
! 1033: /* The zeroth entry corresponds to large objects.*/
! 1034: # ifdef ALL_INTERIOR_POINTERS
! 1035: # define map_entry_type short
! 1036: # define OBJ_INVALID 0x7fff
! 1037: # define MAP_ENTRY(map, bytes) \
! 1038: (((map_entry_type *)(map))[BYTES_TO_WORDS(bytes)])
! 1039: # define MAP_ENTRIES BYTES_TO_WORDS(HBLKSIZE)
! 1040: # define MAP_SIZE (MAP_ENTRIES * sizeof(map_entry_type))
! 1041: # define OFFSET_VALID(displ) TRUE
! 1042: # define CPP_MAX_OFFSET (HBLKSIZE - HDR_BYTES - 1)
! 1043: # define MAX_OFFSET ((word)CPP_MAX_OFFSET)
! 1044: # else
! 1045: # define map_entry_type char
! 1046: # define OBJ_INVALID 0x7f
! 1047: # define MAP_ENTRY(map, bytes) \
! 1048: (map)[bytes]
! 1049: # define MAP_ENTRIES HBLKSIZE
! 1050: # define MAP_SIZE MAP_ENTRIES
! 1051: # define CPP_MAX_OFFSET (WORDS_TO_BYTES(OBJ_INVALID) - 1)
! 1052: # define MAX_OFFSET ((word)CPP_MAX_OFFSET)
! 1053: # define VALID_OFFSET_SZ \
! 1054: (CPP_MAX_OFFSET > WORDS_TO_BYTES(CPP_MAXOBJSZ)? \
! 1055: CPP_MAX_OFFSET+1 \
! 1056: : WORDS_TO_BYTES(CPP_MAXOBJSZ)+1)
! 1057: char _valid_offsets[VALID_OFFSET_SZ];
! 1058: /* GC_valid_offsets[i] == TRUE ==> i */
! 1059: /* is registered as a displacement. */
! 1060: # define OFFSET_VALID(displ) GC_valid_offsets[displ]
! 1061: char _modws_valid_offsets[sizeof(word)];
! 1062: /* GC_valid_offsets[i] ==> */
! 1063: /* GC_modws_valid_offsets[i%sizeof(word)] */
! 1064: # endif
! 1065: # ifdef STUBBORN_ALLOC
! 1066: page_hash_table _changed_pages;
! 1067: /* Stubborn object pages that were changes since last call to */
! 1068: /* GC_read_changed. */
! 1069: page_hash_table _prev_changed_pages;
! 1070: /* Stubborn object pages that were changes before last call to */
! 1071: /* GC_read_changed. */
! 1072: # endif
! 1073: # if defined(PROC_VDB) || defined(MPROTECT_VDB)
! 1074: page_hash_table _grungy_pages; /* Pages that were dirty at last */
! 1075: /* GC_read_dirty. */
! 1076: # endif
! 1077: # ifdef MPROTECT_VDB
! 1078: VOLATILE page_hash_table _dirty_pages;
! 1079: /* Pages dirtied since last GC_read_dirty. */
! 1080: # endif
! 1081: # ifdef PROC_VDB
! 1082: page_hash_table _written_pages; /* Pages ever dirtied */
! 1083: # endif
! 1084: # ifdef LARGE_CONFIG
! 1085: # if CPP_WORDSZ > 32
! 1086: # define MAX_HEAP_SECTS 4096 /* overflows at roughly 64 GB */
! 1087: # else
! 1088: # define MAX_HEAP_SECTS 768 /* Separately added heap sections. */
! 1089: # endif
! 1090: # else
! 1091: # define MAX_HEAP_SECTS 256
! 1092: # endif
! 1093: struct HeapSect {
! 1094: ptr_t hs_start; word hs_bytes;
! 1095: } _heap_sects[MAX_HEAP_SECTS];
! 1096: # ifdef MSWIN32
! 1097: ptr_t _heap_bases[MAX_HEAP_SECTS];
! 1098: /* Start address of memory regions obtained from kernel. */
! 1099: # endif
! 1100: struct roots _static_roots[MAX_ROOT_SETS];
! 1101: # ifndef MSWIN32
! 1102: struct roots * _root_index[RT_SIZE];
! 1103: # endif
! 1104: struct exclusion _excl_table[MAX_EXCLUSIONS];
! 1105: /* Block header index; see gc_headers.h */
! 1106: bottom_index * _all_nils;
! 1107: bottom_index * _top_index [TOP_SZ];
! 1108: #ifdef SAVE_CALL_CHAIN
! 1109: struct callinfo _last_stack[NFRAMES]; /* Stack at last garbage collection.*/
! 1110: /* Useful for debugging mysterious */
! 1111: /* object disappearances. */
! 1112: /* In the multithreaded case, we */
! 1113: /* currently only save the calling */
! 1114: /* stack. */
! 1115: #endif
! 1116: };
! 1117:
! 1118: GC_API GC_FAR struct _GC_arrays GC_arrays;
! 1119:
! 1120: # define GC_objfreelist GC_arrays._objfreelist
! 1121: # define GC_aobjfreelist GC_arrays._aobjfreelist
! 1122: # define GC_uobjfreelist GC_arrays._uobjfreelist
! 1123: # ifdef ATOMIC_UNCOLLECTABLE
! 1124: # define GC_auobjfreelist GC_arrays._auobjfreelist
! 1125: # endif
! 1126: # define GC_sobjfreelist GC_arrays._sobjfreelist
! 1127: # define GC_valid_offsets GC_arrays._valid_offsets
! 1128: # define GC_modws_valid_offsets GC_arrays._modws_valid_offsets
! 1129: # ifdef STUBBORN_ALLOC
! 1130: # define GC_changed_pages GC_arrays._changed_pages
! 1131: # define GC_prev_changed_pages GC_arrays._prev_changed_pages
! 1132: # endif
! 1133: # define GC_obj_map GC_arrays._obj_map
! 1134: # define GC_last_heap_addr GC_arrays._last_heap_addr
! 1135: # define GC_prev_heap_addr GC_arrays._prev_heap_addr
! 1136: # define GC_words_allocd GC_arrays._words_allocd
! 1137: # define GC_words_wasted GC_arrays._words_wasted
! 1138: # define GC_words_finalized GC_arrays._words_finalized
! 1139: # define GC_non_gc_bytes_at_gc GC_arrays._non_gc_bytes_at_gc
! 1140: # define GC_mem_freed GC_arrays._mem_freed
! 1141: # define GC_mark_procs GC_arrays._mark_procs
! 1142: # define GC_heapsize GC_arrays._heapsize
! 1143: # define GC_max_heapsize GC_arrays._max_heapsize
! 1144: # define GC_words_allocd_before_gc GC_arrays._words_allocd_before_gc
! 1145: # define GC_heap_sects GC_arrays._heap_sects
! 1146: # define GC_last_stack GC_arrays._last_stack
! 1147: # ifdef MSWIN32
! 1148: # define GC_heap_bases GC_arrays._heap_bases
! 1149: # endif
! 1150: # define GC_static_roots GC_arrays._static_roots
! 1151: # define GC_root_index GC_arrays._root_index
! 1152: # define GC_excl_table GC_arrays._excl_table
! 1153: # define GC_all_nils GC_arrays._all_nils
! 1154: # define GC_top_index GC_arrays._top_index
! 1155: # if defined(PROC_VDB) || defined(MPROTECT_VDB)
! 1156: # define GC_grungy_pages GC_arrays._grungy_pages
! 1157: # endif
! 1158: # ifdef MPROTECT_VDB
! 1159: # define GC_dirty_pages GC_arrays._dirty_pages
! 1160: # endif
! 1161: # ifdef PROC_VDB
! 1162: # define GC_written_pages GC_arrays._written_pages
! 1163: # endif
! 1164: # ifdef GATHERSTATS
! 1165: # define GC_composite_in_use GC_arrays._composite_in_use
! 1166: # define GC_atomic_in_use GC_arrays._atomic_in_use
! 1167: # endif
! 1168: # ifdef MERGE_SIZES
! 1169: # define GC_size_map GC_arrays._size_map
! 1170: # endif
! 1171:
! 1172: # define beginGC_arrays ((ptr_t)(&GC_arrays))
! 1173: # define endGC_arrays (((ptr_t)(&GC_arrays)) + (sizeof GC_arrays))
! 1174:
! 1175: /* Object kinds: */
! 1176: # define MAXOBJKINDS 16
! 1177:
! 1178: extern struct obj_kind {
! 1179: ptr_t *ok_freelist; /* Array of free listheaders for this kind of object */
! 1180: /* Point either to GC_arrays or to storage allocated */
! 1181: /* with GC_scratch_alloc. */
! 1182: struct hblk **ok_reclaim_list;
! 1183: /* List headers for lists of blocks waiting to be */
! 1184: /* swept. */
! 1185: word ok_descriptor; /* Descriptor template for objects in this */
! 1186: /* block. */
! 1187: GC_bool ok_relocate_descr;
! 1188: /* Add object size in bytes to descriptor */
! 1189: /* template to obtain descriptor. Otherwise */
! 1190: /* template is used as is. */
! 1191: GC_bool ok_init; /* Clear objects before putting them on the free list. */
! 1192: } GC_obj_kinds[MAXOBJKINDS];
! 1193:
! 1194: # define endGC_obj_kinds (((ptr_t)(&GC_obj_kinds)) + (sizeof GC_obj_kinds))
! 1195:
! 1196: # define end_gc_area ((ptr_t)endGC_arrays == (ptr_t)(&GC_obj_kinds) ? \
! 1197: endGC_obj_kinds : endGC_arrays)
! 1198:
! 1199: /* Predefined kinds: */
! 1200: # define PTRFREE 0
! 1201: # define NORMAL 1
! 1202: # define UNCOLLECTABLE 2
! 1203: # ifdef ATOMIC_UNCOLLECTABLE
! 1204: # define AUNCOLLECTABLE 3
! 1205: # define STUBBORN 4
! 1206: # define IS_UNCOLLECTABLE(k) (((k) & ~1) == UNCOLLECTABLE)
! 1207: # else
! 1208: # define STUBBORN 3
! 1209: # define IS_UNCOLLECTABLE(k) ((k) == UNCOLLECTABLE)
! 1210: # endif
! 1211:
! 1212: extern int GC_n_kinds;
! 1213:
! 1214: GC_API word GC_fo_entries;
! 1215:
! 1216: extern word GC_n_heap_sects; /* Number of separately added heap */
! 1217: /* sections. */
! 1218:
! 1219: extern word GC_page_size;
! 1220:
! 1221: # ifdef MSWIN32
! 1222: extern word GC_n_heap_bases; /* See GC_heap_bases. */
! 1223: # endif
! 1224:
! 1225: extern word GC_total_stack_black_listed;
! 1226: /* Number of bytes on stack blacklist. */
! 1227:
! 1228: extern word GC_black_list_spacing;
! 1229: /* Average number of bytes between blacklisted */
! 1230: /* blocks. Approximate. */
! 1231: /* Counts only blocks that are */
! 1232: /* "stack-blacklisted", i.e. that are */
! 1233: /* problematic in the interior of an object. */
! 1234:
! 1235: extern char * GC_invalid_map;
! 1236: /* Pointer to the nowhere valid hblk map */
! 1237: /* Blocks pointing to this map are free. */
! 1238:
! 1239: extern struct hblk * GC_hblkfreelist;
! 1240: /* List of completely empty heap blocks */
! 1241: /* Linked through hb_next field of */
! 1242: /* header structure associated with */
! 1243: /* block. */
! 1244:
! 1245: extern GC_bool GC_is_initialized; /* GC_init() has been run. */
! 1246:
! 1247: extern GC_bool GC_objects_are_marked; /* There are marked objects in */
! 1248: /* the heap. */
! 1249:
! 1250: #ifndef SMALL_CONFIG
! 1251: extern GC_bool GC_incremental;
! 1252: /* Using incremental/generational collection. */
! 1253: #else
! 1254: # define GC_incremental TRUE
! 1255: /* Hopefully allow optimizer to remove some code. */
! 1256: #endif
! 1257:
! 1258: extern GC_bool GC_dirty_maintained;
! 1259: /* Dirty bits are being maintained, */
! 1260: /* either for incremental collection, */
! 1261: /* or to limit the root set. */
! 1262:
! 1263: extern word GC_root_size; /* Total size of registered root sections */
! 1264:
! 1265: extern GC_bool GC_debugging_started; /* GC_debug_malloc has been called. */
! 1266:
! 1267: extern ptr_t GC_least_plausible_heap_addr;
! 1268: extern ptr_t GC_greatest_plausible_heap_addr;
! 1269: /* Bounds on the heap. Guaranteed valid */
! 1270: /* Likely to include future heap expansion. */
! 1271:
! 1272: /* Operations */
! 1273: # ifndef abs
! 1274: # define abs(x) ((x) < 0? (-(x)) : (x))
! 1275: # endif
! 1276:
! 1277:
! 1278: /* Marks are in a reserved area in */
! 1279: /* each heap block. Each word has one mark bit associated */
! 1280: /* with it. Only those corresponding to the beginning of an */
! 1281: /* object are used. */
! 1282:
! 1283:
! 1284: /* Mark bit operations */
! 1285:
! 1286: /*
! 1287: * Retrieve, set, clear the mark bit corresponding
! 1288: * to the nth word in a given heap block.
! 1289: *
! 1290: * (Recall that bit n corresponds to object beginning at word n
! 1291: * relative to the beginning of the block, including unused words)
! 1292: */
! 1293:
! 1294: # define mark_bit_from_hdr(hhdr,n) (((hhdr)->hb_marks[divWORDSZ(n)] \
! 1295: >> (modWORDSZ(n))) & (word)1)
! 1296: # define set_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
! 1297: |= (word)1 << modWORDSZ(n)
! 1298:
! 1299: # define clear_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
! 1300: &= ~((word)1 << modWORDSZ(n))
! 1301:
! 1302: /* Important internal collector routines */
! 1303:
! 1304: ptr_t GC_approx_sp();
! 1305:
! 1306: GC_bool GC_should_collect();
! 1307: #ifdef PRESERVE_LAST
! 1308: GC_bool GC_in_last_heap_sect(/* ptr_t */);
! 1309: /* In last added heap section? If so, avoid breaking up. */
! 1310: #endif
! 1311: void GC_apply_to_all_blocks(/*fn, client_data*/);
! 1312: /* Invoke fn(hbp, client_data) for each */
! 1313: /* allocated heap block. */
! 1314: struct hblk * GC_next_block(/* struct hblk * h */);
! 1315: void GC_mark_init();
! 1316: void GC_clear_marks(); /* Clear mark bits for all heap objects. */
! 1317: void GC_invalidate_mark_state(); /* Tell the marker that marked */
! 1318: /* objects may point to unmarked */
! 1319: /* ones, and roots may point to */
! 1320: /* unmarked objects. */
! 1321: /* Reset mark stack. */
! 1322: void GC_mark_from_mark_stack(); /* Mark from everything on the mark stack. */
! 1323: /* Return after about one pages worth of */
! 1324: /* work. */
! 1325: GC_bool GC_mark_stack_empty();
! 1326: GC_bool GC_mark_some(/* cold_gc_frame */);
! 1327: /* Perform about one pages worth of marking */
! 1328: /* work of whatever kind is needed. Returns */
! 1329: /* quickly if no collection is in progress. */
! 1330: /* Return TRUE if mark phase finished. */
! 1331: void GC_initiate_gc(); /* initiate collection. */
! 1332: /* If the mark state is invalid, this */
! 1333: /* becomes full colleection. Otherwise */
! 1334: /* it's partial. */
! 1335: void GC_push_all(/*b,t*/); /* Push everything in a range */
! 1336: /* onto mark stack. */
! 1337: void GC_push_dirty(/*b,t*/); /* Push all possibly changed */
! 1338: /* subintervals of [b,t) onto */
! 1339: /* mark stack. */
! 1340: #ifndef SMALL_CONFIG
! 1341: void GC_push_conditional(/* ptr_t b, ptr_t t, GC_bool all*/);
! 1342: #else
! 1343: # define GC_push_conditional(b, t, all) GC_push_all(b, t)
! 1344: #endif
! 1345: /* Do either of the above, depending */
! 1346: /* on the third arg. */
! 1347: void GC_push_all_stack(/*b,t*/); /* As above, but consider */
! 1348: /* interior pointers as valid */
! 1349: void GC_push_all_eager(/*b,t*/); /* Same as GC_push_all_stack, but */
! 1350: /* ensures that stack is scanned */
! 1351: /* immediately, not just scheduled */
! 1352: /* for scanning. */
! 1353: #ifndef THREADS
! 1354: void GC_push_all_stack_partially_eager(/* bottom, top, cold_gc_frame */);
! 1355: /* Similar to GC_push_all_eager, but only the */
! 1356: /* part hotter than cold_gc_frame is scanned */
! 1357: /* immediately. Needed to endure that callee- */
! 1358: /* save registers are not missed. */
! 1359: #else
! 1360: /* In the threads case, we push part of the current thread stack */
! 1361: /* with GC_push_all_eager when we push the registers. This gets the */
! 1362: /* callee-save registers that may disappear. The remainder of the */
! 1363: /* stacks are scheduled for scanning in *GC_push_other_roots, which */
! 1364: /* is thread-package-specific. */
! 1365: #endif
! 1366: void GC_push_current_stack(/* ptr_t cold_gc_frame */);
! 1367: /* Push enough of the current stack eagerly to */
! 1368: /* ensure that callee-save registers saved in */
! 1369: /* GC frames are scanned. */
! 1370: /* In the non-threads case, schedule entire */
! 1371: /* stack for scanning. */
! 1372: void GC_push_roots(/* GC_bool all, ptr_t cold_gc_frame */);
! 1373: /* Push all or dirty roots. */
! 1374: extern void (*GC_push_other_roots)();
! 1375: /* Push system or application specific roots */
! 1376: /* onto the mark stack. In some environments */
! 1377: /* (e.g. threads environments) this is */
! 1378: /* predfined to be non-zero. A client supplied */
! 1379: /* replacement should also call the original */
! 1380: /* function. */
! 1381: extern void (*GC_start_call_back)(/* void */);
! 1382: /* Called at start of full collections. */
! 1383: /* Not called if 0. Called with allocation */
! 1384: /* lock held. */
! 1385: /* 0 by default. */
! 1386: void GC_push_regs(); /* Push register contents onto mark stack. */
! 1387: void GC_remark(); /* Mark from all marked objects. Used */
! 1388: /* only if we had to drop something. */
! 1389: # if defined(MSWIN32)
! 1390: void __cdecl GC_push_one();
! 1391: # else
! 1392: void GC_push_one(/*p*/); /* If p points to an object, mark it */
! 1393: /* and push contents on the mark stack */
! 1394: # endif
! 1395: void GC_push_one_checked(/*p*/); /* Ditto, omits plausibility test */
! 1396: void GC_push_marked(/* struct hblk h, hdr * hhdr */);
! 1397: /* Push contents of all marked objects in h onto */
! 1398: /* mark stack. */
! 1399: #ifdef SMALL_CONFIG
! 1400: # define GC_push_next_marked_dirty(h) GC_push_next_marked(h)
! 1401: #else
! 1402: struct hblk * GC_push_next_marked_dirty(/* h */);
! 1403: /* Invoke GC_push_marked on next dirty block above h. */
! 1404: /* Return a pointer just past the end of this block. */
! 1405: #endif /* !SMALL_CONFIG */
! 1406: struct hblk * GC_push_next_marked(/* h */);
! 1407: /* Ditto, but also mark from clean pages. */
! 1408: struct hblk * GC_push_next_marked_uncollectable(/* h */);
! 1409: /* Ditto, but mark only from uncollectable pages. */
! 1410: GC_bool GC_stopped_mark(); /* Stop world and mark from all roots */
! 1411: /* and rescuers. */
! 1412: void GC_clear_hdr_marks(/* hhdr */); /* Clear the mark bits in a header */
! 1413: void GC_set_hdr_marks(/* hhdr */); /* Set the mark bits in a header */
! 1414: void GC_add_roots_inner();
! 1415: GC_bool GC_is_static_root(/* ptr_t p */);
! 1416: /* Is the address p in one of the registered static */
! 1417: /* root sections? */
! 1418: void GC_register_dynamic_libraries();
! 1419: /* Add dynamic library data sections to the root set. */
! 1420:
! 1421: /* Machine dependent startup routines */
! 1422: ptr_t GC_get_stack_base();
! 1423: void GC_register_data_segments();
! 1424:
! 1425: /* Black listing: */
! 1426: void GC_bl_init();
! 1427: # ifndef ALL_INTERIOR_POINTERS
! 1428: void GC_add_to_black_list_normal(/* bits, maybe source */);
! 1429: /* Register bits as a possible future false */
! 1430: /* reference from the heap or static data */
! 1431: # ifdef PRINT_BLACK_LIST
! 1432: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1433: GC_add_to_black_list_normal(bits, source)
! 1434: # else
! 1435: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1436: GC_add_to_black_list_normal(bits)
! 1437: # endif
! 1438: # else
! 1439: # ifdef PRINT_BLACK_LIST
! 1440: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1441: GC_add_to_black_list_stack(bits, source)
! 1442: # else
! 1443: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
! 1444: GC_add_to_black_list_stack(bits)
! 1445: # endif
! 1446: # endif
! 1447:
! 1448: void GC_add_to_black_list_stack(/* bits, maybe source */);
! 1449: struct hblk * GC_is_black_listed(/* h, len */);
! 1450: /* If there are likely to be false references */
! 1451: /* to a block starting at h of the indicated */
! 1452: /* length, then return the next plausible */
! 1453: /* starting location for h that might avoid */
! 1454: /* these false references. */
! 1455: void GC_promote_black_lists();
! 1456: /* Declare an end to a black listing phase. */
! 1457: void GC_unpromote_black_lists();
! 1458: /* Approximately undo the effect of the above. */
! 1459: /* This actually loses some information, but */
! 1460: /* only in a reasonably safe way. */
! 1461: word GC_number_stack_black_listed(/*struct hblk *start, struct hblk *endp1 */);
! 1462: /* Return the number of (stack) blacklisted */
! 1463: /* blocks in the range for statistical */
! 1464: /* purposes. */
! 1465:
! 1466: ptr_t GC_scratch_alloc(/*bytes*/);
! 1467: /* GC internal memory allocation for */
! 1468: /* small objects. Deallocation is not */
! 1469: /* possible. */
! 1470:
! 1471: /* Heap block layout maps: */
! 1472: void GC_invalidate_map(/* hdr */);
! 1473: /* Remove the object map associated */
! 1474: /* with the block. This identifies */
! 1475: /* the block as invalid to the mark */
! 1476: /* routines. */
! 1477: GC_bool GC_add_map_entry(/*sz*/);
! 1478: /* Add a heap block map for objects of */
! 1479: /* size sz to obj_map. */
! 1480: /* Return FALSE on failure. */
! 1481: void GC_register_displacement_inner(/*offset*/);
! 1482: /* Version of GC_register_displacement */
! 1483: /* that assumes lock is already held */
! 1484: /* and signals are already disabled. */
! 1485:
! 1486: /* hblk allocation: */
! 1487: void GC_new_hblk(/*size_in_words, kind*/);
! 1488: /* Allocate a new heap block, and build */
! 1489: /* a free list in it. */
! 1490: struct hblk * GC_allochblk(/*size_in_words, kind*/);
! 1491: /* Allocate a heap block, clear it if */
! 1492: /* for composite objects, inform */
! 1493: /* the marker that block is valid */
! 1494: /* for objects of indicated size. */
! 1495: /* sz < 0 ==> atomic. */
! 1496: void GC_freehblk(); /* Deallocate a heap block and mark it */
! 1497: /* as invalid. */
! 1498:
! 1499: /* Misc GC: */
! 1500: void GC_init_inner();
! 1501: GC_bool GC_expand_hp_inner();
! 1502: void GC_start_reclaim(/*abort_if_found*/);
! 1503: /* Restore unmarked objects to free */
! 1504: /* lists, or (if abort_if_found is */
! 1505: /* TRUE) report them. */
! 1506: /* Sweeping of small object pages is */
! 1507: /* largely deferred. */
! 1508: void GC_continue_reclaim(/*size, kind*/);
! 1509: /* Sweep pages of the given size and */
! 1510: /* kind, as long as possible, and */
! 1511: /* as long as the corr. free list is */
! 1512: /* empty. */
! 1513: void GC_reclaim_or_delete_all();
! 1514: /* Arrange for all reclaim lists to be */
! 1515: /* empty. Judiciously choose between */
! 1516: /* sweeping and discarding each page. */
! 1517: GC_bool GC_reclaim_all(/* GC_stop_func f*/);
! 1518: /* Reclaim all blocks. Abort (in a */
! 1519: /* consistent state) if f returns TRUE. */
! 1520: GC_bool GC_block_empty(/* hhdr */); /* Block completely unmarked? */
! 1521: GC_bool GC_never_stop_func(); /* Returns FALSE. */
! 1522: GC_bool GC_try_to_collect_inner(/* GC_stop_func f */);
! 1523: /* Collect; caller must have acquired */
! 1524: /* lock and disabled signals. */
! 1525: /* Collection is aborted if f returns */
! 1526: /* TRUE. Returns TRUE if it completes */
! 1527: /* successfully. */
! 1528: # define GC_gcollect_inner() \
! 1529: (void) GC_try_to_collect_inner(GC_never_stop_func)
! 1530: void GC_finish_collection(); /* Finish collection. Mark bits are */
! 1531: /* consistent and lock is still held. */
! 1532: GC_bool GC_collect_or_expand(/* needed_blocks */);
! 1533: /* Collect or expand heap in an attempt */
! 1534: /* make the indicated number of free */
! 1535: /* blocks available. Should be called */
! 1536: /* until the blocks are available or */
! 1537: /* until it fails by returning FALSE. */
! 1538: GC_API void GC_init(); /* Initialize collector. */
! 1539: void GC_collect_a_little_inner(/* int n */);
! 1540: /* Do n units worth of garbage */
! 1541: /* collection work, if appropriate. */
! 1542: /* A unit is an amount appropriate for */
! 1543: /* HBLKSIZE bytes of allocation. */
! 1544: ptr_t GC_generic_malloc(/* bytes, kind */);
! 1545: /* Allocate an object of the given */
! 1546: /* kind. By default, there are only */
! 1547: /* a few kinds: composite(pointerfree), */
! 1548: /* atomic, uncollectable, etc. */
! 1549: /* We claim it's possible for clever */
! 1550: /* client code that understands GC */
! 1551: /* internals to add more, e.g. to */
! 1552: /* communicate object layout info */
! 1553: /* to the collector. */
! 1554: ptr_t GC_generic_malloc_ignore_off_page(/* bytes, kind */);
! 1555: /* As above, but pointers past the */
! 1556: /* first page of the resulting object */
! 1557: /* are ignored. */
! 1558: ptr_t GC_generic_malloc_inner(/* bytes, kind */);
! 1559: /* Ditto, but I already hold lock, etc. */
! 1560: ptr_t GC_generic_malloc_words_small GC_PROTO((size_t words, int kind));
! 1561: /* As above, but size in units of words */
! 1562: /* Bypasses MERGE_SIZES. Assumes */
! 1563: /* words <= MAXOBJSZ. */
! 1564: ptr_t GC_generic_malloc_inner_ignore_off_page(/* bytes, kind */);
! 1565: /* Allocate an object, where */
! 1566: /* the client guarantees that there */
! 1567: /* will always be a pointer to the */
! 1568: /* beginning of the object while the */
! 1569: /* object is live. */
! 1570: ptr_t GC_allocobj(/* sz_inn_words, kind */);
! 1571: /* Make the indicated */
! 1572: /* free list nonempty, and return its */
! 1573: /* head. */
! 1574:
! 1575: void GC_init_headers();
! 1576: GC_bool GC_install_header(/*h*/);
! 1577: /* Install a header for block h. */
! 1578: /* Return FALSE on failure. */
! 1579: GC_bool GC_install_counts(/*h, sz*/);
! 1580: /* Set up forwarding counts for block */
! 1581: /* h of size sz. */
! 1582: /* Return FALSE on failure. */
! 1583: void GC_remove_header(/*h*/);
! 1584: /* Remove the header for block h. */
! 1585: void GC_remove_counts(/*h, sz*/);
! 1586: /* Remove forwarding counts for h. */
! 1587: hdr * GC_find_header(/*p*/); /* Debugging only. */
! 1588:
! 1589: void GC_finalize(); /* Perform all indicated finalization actions */
! 1590: /* on unmarked objects. */
! 1591: /* Unreachable finalizable objects are enqueued */
! 1592: /* for processing by GC_invoke_finalizers. */
! 1593: /* Invoked with lock. */
! 1594:
! 1595: void GC_add_to_heap(/*p, bytes*/);
! 1596: /* Add a HBLKSIZE aligned chunk to the heap. */
! 1597:
! 1598: void GC_print_obj(/* ptr_t p */);
! 1599: /* P points to somewhere inside an object with */
! 1600: /* debugging info. Print a human readable */
! 1601: /* description of the object to stderr. */
! 1602: extern void (*GC_check_heap)();
! 1603: /* Check that all objects in the heap with */
! 1604: /* debugging info are intact. Print */
! 1605: /* descriptions of any that are not. */
! 1606: extern void (*GC_print_heap_obj)(/* ptr_t p */);
! 1607: /* If possible print s followed by a more */
! 1608: /* detailed description of the object */
! 1609: /* referred to by p. */
! 1610:
! 1611: /* Virtual dirty bit implementation: */
! 1612: /* Each implementation exports the following: */
! 1613: void GC_read_dirty(); /* Retrieve dirty bits. */
! 1614: GC_bool GC_page_was_dirty(/* struct hblk * h */);
! 1615: /* Read retrieved dirty bits. */
! 1616: GC_bool GC_page_was_ever_dirty(/* struct hblk * h */);
! 1617: /* Could the page contain valid heap pointers? */
! 1618: void GC_is_fresh(/* struct hblk * h, word number_of_blocks */);
! 1619: /* Assert the region currently contains no */
! 1620: /* valid pointers. */
! 1621: void GC_write_hint(/* struct hblk * h */);
! 1622: /* h is about to be written. */
! 1623: void GC_dirty_init();
! 1624:
! 1625: /* Slow/general mark bit manipulation: */
! 1626: GC_API GC_bool GC_is_marked();
! 1627: void GC_clear_mark_bit();
! 1628: void GC_set_mark_bit();
! 1629:
! 1630: /* Stubborn objects: */
! 1631: void GC_read_changed(); /* Analogous to GC_read_dirty */
! 1632: GC_bool GC_page_was_changed(/* h */); /* Analogous to GC_page_was_dirty */
! 1633: void GC_clean_changing_list(); /* Collect obsolete changing list entries */
! 1634: void GC_stubborn_init();
! 1635:
! 1636: /* Debugging print routines: */
! 1637: void GC_print_block_list();
! 1638: void GC_print_hblkfreelist();
! 1639: void GC_print_heap_sects();
! 1640: void GC_print_static_roots();
! 1641: void GC_dump();
! 1642:
! 1643: /* Make arguments appear live to compiler */
! 1644: # ifdef __WATCOMC__
! 1645: void GC_noop(void*, ...);
! 1646: # else
! 1647: GC_API void GC_noop();
! 1648: # endif
! 1649:
! 1650: void GC_noop1(/* word arg */);
! 1651:
! 1652: /* Logging and diagnostic output: */
! 1653: GC_API void GC_printf GC_PROTO((char * format, long, long, long, long, long, long));
! 1654: /* A version of printf that doesn't allocate, */
! 1655: /* is restricted to long arguments, and */
! 1656: /* (unfortunately) doesn't use varargs for */
! 1657: /* portability. Restricted to 6 args and */
! 1658: /* 1K total output length. */
! 1659: /* (We use sprintf. Hopefully that doesn't */
! 1660: /* allocate for long arguments.) */
! 1661: # define GC_printf0(f) GC_printf(f, 0l, 0l, 0l, 0l, 0l, 0l)
! 1662: # define GC_printf1(f,a) GC_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
! 1663: # define GC_printf2(f,a,b) GC_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
! 1664: # define GC_printf3(f,a,b,c) GC_printf(f, (long)a, (long)b, (long)c, 0l, 0l, 0l)
! 1665: # define GC_printf4(f,a,b,c,d) GC_printf(f, (long)a, (long)b, (long)c, \
! 1666: (long)d, 0l, 0l)
! 1667: # define GC_printf5(f,a,b,c,d,e) GC_printf(f, (long)a, (long)b, (long)c, \
! 1668: (long)d, (long)e, 0l)
! 1669: # define GC_printf6(f,a,b,c,d,e,g) GC_printf(f, (long)a, (long)b, (long)c, \
! 1670: (long)d, (long)e, (long)g)
! 1671:
! 1672: void GC_err_printf(/* format, a, b, c, d, e, f */);
! 1673: # define GC_err_printf0(f) GC_err_puts(f)
! 1674: # define GC_err_printf1(f,a) GC_err_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
! 1675: # define GC_err_printf2(f,a,b) GC_err_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
! 1676: # define GC_err_printf3(f,a,b,c) GC_err_printf(f, (long)a, (long)b, (long)c, \
! 1677: 0l, 0l, 0l)
! 1678: # define GC_err_printf4(f,a,b,c,d) GC_err_printf(f, (long)a, (long)b, \
! 1679: (long)c, (long)d, 0l, 0l)
! 1680: # define GC_err_printf5(f,a,b,c,d,e) GC_err_printf(f, (long)a, (long)b, \
! 1681: (long)c, (long)d, \
! 1682: (long)e, 0l)
! 1683: # define GC_err_printf6(f,a,b,c,d,e,g) GC_err_printf(f, (long)a, (long)b, \
! 1684: (long)c, (long)d, \
! 1685: (long)e, (long)g)
! 1686: /* Ditto, writes to stderr. */
! 1687:
! 1688: void GC_err_puts(/* char *s */);
! 1689: /* Write s to stderr, don't buffer, don't add */
! 1690: /* newlines, don't ... */
! 1691:
! 1692:
! 1693: # endif /* GC_PRIVATE_H */
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