Annotation of OpenXM_contrib2/asir2000/gc/gc_priv.h, Revision 1.2
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.
1.2 ! noro 4: * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
! 5: * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
! 6: *
1.1 noro 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 CONFIG_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:
1.2 ! noro 77: #define CONST GC_CONST
! 78:
1.1 noro 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: /* Definitions for conservative */
88: /* collector */
89: /* */
90: /*********************************/
91:
92: /*********************************/
93: /* */
94: /* Easily changeable parameters */
95: /* */
96: /*********************************/
97:
98: #define STUBBORN_ALLOC /* Define stubborn allocation primitives */
99: #if defined(SRC_M3) || defined(SMALL_CONFIG)
100: # undef STUBBORN_ALLOC
101: #endif
102:
103:
104: /* #define ALL_INTERIOR_POINTERS */
105: /* Forces all pointers into the interior of an */
106: /* object to be considered valid. Also causes the */
107: /* sizes of all objects to be inflated by at least */
108: /* one byte. This should suffice to guarantee */
109: /* that in the presence of a compiler that does */
110: /* not perform garbage-collector-unsafe */
111: /* optimizations, all portable, strictly ANSI */
112: /* conforming C programs should be safely usable */
113: /* with malloc replaced by GC_malloc and free */
114: /* calls removed. There are several disadvantages: */
115: /* 1. There are probably no interesting, portable, */
116: /* strictly ANSI conforming C programs. */
117: /* 2. This option makes it hard for the collector */
118: /* to allocate space that is not ``pointed to'' */
119: /* by integers, etc. Under SunOS 4.X with a */
120: /* statically linked libc, we empiricaly */
121: /* observed that it would be difficult to */
122: /* allocate individual objects larger than 100K. */
123: /* Even if only smaller objects are allocated, */
124: /* more swap space is likely to be needed. */
125: /* Fortunately, much of this will never be */
126: /* touched. */
127: /* If you can easily avoid using this option, do. */
128: /* If not, try to keep individual objects small. */
129:
130: #define PRINTSTATS /* Print garbage collection statistics */
131: /* For less verbose output, undefine in reclaim.c */
132:
133: #define PRINTTIMES /* Print the amount of time consumed by each garbage */
134: /* collection. */
135:
136: #define PRINTBLOCKS /* Print object sizes associated with heap blocks, */
137: /* whether the objects are atomic or composite, and */
138: /* whether or not the block was found to be empty */
139: /* during the reclaim phase. Typically generates */
140: /* about one screenful per garbage collection. */
141: #undef PRINTBLOCKS
142:
143: #ifdef SILENT
144: # ifdef PRINTSTATS
145: # undef PRINTSTATS
146: # endif
147: # ifdef PRINTTIMES
148: # undef PRINTTIMES
149: # endif
150: # ifdef PRINTNBLOCKS
151: # undef PRINTNBLOCKS
152: # endif
153: #endif
154:
155: #if defined(PRINTSTATS) && !defined(GATHERSTATS)
156: # define GATHERSTATS
157: #endif
158:
159: #ifdef FINALIZE_ON_DEMAND
160: # define GC_INVOKE_FINALIZERS()
161: #else
162: # define GC_INVOKE_FINALIZERS() (void)GC_invoke_finalizers()
163: #endif
164:
165: #define MERGE_SIZES /* Round up some object sizes, so that fewer distinct */
166: /* free lists are actually maintained. This applies */
167: /* only to the top level routines in misc.c, not to */
168: /* user generated code that calls GC_allocobj and */
169: /* GC_allocaobj directly. */
170: /* Slows down average programs slightly. May however */
171: /* substantially reduce fragmentation if allocation */
172: /* request sizes are widely scattered. */
173: /* May save significant amounts of space for obj_map */
174: /* entries. */
175:
176: #ifndef OLD_BLOCK_ALLOC
177: /* Macros controlling large block allocation strategy. */
178: # define EXACT_FIRST /* Make a complete pass through the large object */
179: /* free list before splitting a block */
180: # define PRESERVE_LAST /* Do not divide last allocated heap segment */
181: /* unless we would otherwise need to expand the */
182: /* heap. */
183: #endif
184:
185: /* ALIGN_DOUBLE requires MERGE_SIZES at present. */
186: # if defined(ALIGN_DOUBLE) && !defined(MERGE_SIZES)
187: # define MERGE_SIZES
188: # endif
189:
190: #if defined(ALL_INTERIOR_POINTERS) && !defined(DONT_ADD_BYTE_AT_END)
191: # define ADD_BYTE_AT_END
192: #endif
193:
194:
195: # ifndef LARGE_CONFIG
196: # define MINHINCR 16 /* Minimum heap increment, in blocks of HBLKSIZE */
197: /* Must be multiple of largest page size. */
198: # define MAXHINCR 512 /* Maximum heap increment, in blocks */
199: # else
200: # define MINHINCR 64
201: # define MAXHINCR 4096
202: # endif
203:
204: # define TIME_LIMIT 50 /* We try to keep pause times from exceeding */
205: /* this by much. In milliseconds. */
206:
207: # define BL_LIMIT GC_black_list_spacing
208: /* If we need a block of N bytes, and we have */
209: /* a block of N + BL_LIMIT bytes available, */
210: /* and N > BL_LIMIT, */
211: /* but all possible positions in it are */
212: /* blacklisted, we just use it anyway (and */
213: /* print a warning, if warnings are enabled). */
214: /* This risks subsequently leaking the block */
215: /* due to a false reference. But not using */
216: /* the block risks unreasonable immediate */
217: /* heap growth. */
218:
219: /*********************************/
220: /* */
221: /* Stack saving for debugging */
222: /* */
223: /*********************************/
224:
225: #ifdef SAVE_CALL_CHAIN
226:
227: /*
228: * Number of frames and arguments to save in objects allocated by
229: * debugging allocator.
230: */
231: # define NFRAMES 6 /* Number of frames to save. Even for */
232: /* alignment reasons. */
233: # define NARGS 2 /* Mumber of arguments to save for each call. */
234:
235: # define NEED_CALLINFO
236:
237: /* Fill in the pc and argument information for up to NFRAMES of my */
238: /* callers. Ignore my frame and my callers frame. */
239: void GC_save_callers (/* struct callinfo info[NFRAMES] */);
240:
241: void GC_print_callers (/* struct callinfo info[NFRAMES] */);
242:
243: #else
244:
245: # ifdef GC_ADD_CALLER
246: # define NFRAMES 1
247: # define NARGS 0
248: # define NEED_CALLINFO
249: # endif
250:
251: #endif
252:
253: #ifdef NEED_CALLINFO
254: struct callinfo {
255: word ci_pc;
256: # if NARGS > 0
257: word ci_arg[NARGS]; /* bit-wise complement to avoid retention */
258: # endif
259: # if defined(ALIGN_DOUBLE) && (NFRAMES * (NARGS + 1)) % 2 == 1
260: /* Likely alignment problem. */
261: word ci_dummy;
262: # endif
263: };
264: #endif
265:
266:
267: /*********************************/
268: /* */
269: /* OS interface routines */
270: /* */
271: /*********************************/
272:
273: #ifdef BSD_TIME
274: # undef CLOCK_TYPE
275: # undef GET_TIME
276: # undef MS_TIME_DIFF
277: # define CLOCK_TYPE struct timeval
278: # define GET_TIME(x) { struct rusage rusage; \
279: getrusage (RUSAGE_SELF, &rusage); \
280: x = rusage.ru_utime; }
281: # define MS_TIME_DIFF(a,b) ((double) (a.tv_sec - b.tv_sec) * 1000.0 \
282: + (double) (a.tv_usec - b.tv_usec) / 1000.0)
283: #else /* !BSD_TIME */
284: # include <time.h>
285: # if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4)
286: clock_t clock(); /* Not in time.h, where it belongs */
287: # endif
288: # if defined(FREEBSD) && !defined(CLOCKS_PER_SEC)
289: # include <machine/limits.h>
290: # define CLOCKS_PER_SEC CLK_TCK
291: # endif
292: # if !defined(CLOCKS_PER_SEC)
293: # define CLOCKS_PER_SEC 1000000
294: /*
295: * This is technically a bug in the implementation. ANSI requires that
296: * CLOCKS_PER_SEC be defined. But at least under SunOS4.1.1, it isn't.
297: * Also note that the combination of ANSI C and POSIX is incredibly gross
298: * here. The type clock_t is used by both clock() and times(). But on
299: * some machines these use different notions of a clock tick, CLOCKS_PER_SEC
300: * seems to apply only to clock. Hence we use it here. On many machines,
301: * including SunOS, clock actually uses units of microseconds (which are
302: * not really clock ticks).
303: */
304: # endif
305: # define CLOCK_TYPE clock_t
306: # define GET_TIME(x) x = clock()
307: # define MS_TIME_DIFF(a,b) ((unsigned long) \
308: (1000.0*(double)((a)-(b))/(double)CLOCKS_PER_SEC))
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: # ifdef LINUX_THREADS
441: # include <pthread.h>
1.2 ! noro 442: # if defined(I386)
1.1 noro 443: inline static int GC_test_and_set(volatile unsigned int *addr) {
444: int oldval;
445: /* Note: the "xchg" instruction does not need a "lock" prefix */
446: __asm__ __volatile__("xchgl %0, %1"
447: : "=r"(oldval), "=m"(*(addr))
448: : "0"(1), "m"(*(addr)));
449: return oldval;
450: }
451: # else
1.2 ! noro 452: # if defined(POWERPC)
! 453: inline static int GC_test_and_set(volatile unsigned int *addr) {
! 454: int oldval;
! 455: int temp = 1; // locked value
! 456:
! 457: __asm__ __volatile__(
! 458: "1:\tlwarx %0,0,%3\n" // load and reserve
! 459: "\tcmpwi %0, 0\n" // if load is
! 460: "\tbne 2f\n" // non-zero, return already set
! 461: "\tstwcx. %2,0,%1\n" // else store conditional
! 462: "\tbne- 1b\n" // retry if lost reservation
! 463: "2:\t\n" // oldval is zero if we set
! 464: : "=&r"(oldval), "=p"(addr)
! 465: : "r"(temp), "1"(addr)
! 466: : "memory");
! 467: return (int)oldval;
! 468: }
! 469: # else
! 470: # ifdef ALPHA
! 471: inline static int GC_test_and_set(volatile unsigned int *
! 472: addr)
! 473: {
! 474: unsigned long oldvalue;
! 475: unsigned long temp;
! 476:
! 477: __asm__ __volatile__(
! 478: "1: ldl_l %0,%1\n"
! 479: " and %0,%3,%2\n"
! 480: " bne %2,2f\n"
! 481: " xor %0,%3,%0\n"
! 482: " stl_c %0,%1\n"
! 483: " beq %0,3f\n"
! 484: " mb\n"
! 485: "2:\n"
! 486: ".section .text2,\"ax\"\n"
! 487: "3: br 1b\n"
! 488: ".previous"
! 489: :"=&r" (temp), "=m" (*addr), "=&r"
! 490: (oldvalue)
! 491: :"Ir" (1), "m" (*addr));
! 492:
! 493: return oldvalue;
! 494: }
! 495: # else
! 496: -- > Need implementation of GC_test_and_set()
! 497: # endif
! 498: # endif
1.1 noro 499: # endif
1.2 ! noro 500: inline static void GC_clear(volatile unsigned int *addr) {
! 501: *(addr) = 0;
! 502: }
1.1 noro 503:
504: extern volatile unsigned int GC_allocate_lock;
505: /* This is not a mutex because mutexes that obey the (optional) */
506: /* POSIX scheduling rules are subject to convoys in high contention */
507: /* applications. This is basically a spin lock. */
508: extern pthread_t GC_lock_holder;
509: extern void GC_lock(void);
510: /* Allocation lock holder. Only set if acquired by client through */
511: /* GC_call_with_alloc_lock. */
512: # define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
513: # define NO_THREAD (pthread_t)(-1)
514: # define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
515: # define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
1.2 ! noro 516: # define LOCK() \
1.1 noro 517: { if (GC_test_and_set(&GC_allocate_lock)) GC_lock(); }
1.2 ! noro 518: # define UNLOCK() \
1.1 noro 519: GC_clear(&GC_allocate_lock)
520: extern GC_bool GC_collecting;
521: # define ENTER_GC() \
522: { \
523: GC_collecting = 1; \
524: }
525: # define EXIT_GC() GC_collecting = 0;
526: # endif /* LINUX_THREADS */
1.2 ! noro 527: # if defined(HPUX_THREADS)
1.1 noro 528: # include <pthread.h>
1.2 ! noro 529: extern pthread_mutex_t GC_allocate_ml;
! 530: # define LOCK() pthread_mutex_lock(&GC_allocate_ml)
! 531: # define UNLOCK() pthread_mutex_unlock(&GC_allocate_ml)
! 532: # endif
! 533: # if defined(IRIX_THREADS) || defined(IRIX_JDK_THREADS)
! 534: /* This may also eventually be appropriate for HPUX_THREADS */
! 535: # include <pthread.h>
! 536: # ifndef HPUX_THREADS
! 537: /* This probably should never be included, but I can't test */
! 538: /* on Irix anymore. */
! 539: # include <mutex.h>
! 540: # endif
1.1 noro 541:
1.2 ! noro 542: # ifndef HPUX_THREADS
! 543: # if __mips < 3 || !(defined (_ABIN32) || defined(_ABI64)) \
1.1 noro 544: || !defined(_COMPILER_VERSION) || _COMPILER_VERSION < 700
545: # define GC_test_and_set(addr, v) test_and_set(addr,v)
1.2 ! noro 546: # else
! 547: # define GC_test_and_set(addr, v) __test_and_set(addr,v)
! 548: # endif
1.1 noro 549: # else
1.2 ! noro 550: /* I couldn't find a way to do this inline on HP/UX */
1.1 noro 551: # endif
552: extern unsigned long GC_allocate_lock;
553: /* This is not a mutex because mutexes that obey the (optional) */
554: /* POSIX scheduling rules are subject to convoys in high contention */
555: /* applications. This is basically a spin lock. */
556: extern pthread_t GC_lock_holder;
557: extern void GC_lock(void);
558: /* Allocation lock holder. Only set if acquired by client through */
559: /* GC_call_with_alloc_lock. */
560: # define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
561: # define NO_THREAD (pthread_t)(-1)
562: # define UNSET_LOCK_HOLDER() GC_lock_holder = NO_THREAD
563: # define I_HOLD_LOCK() (pthread_equal(GC_lock_holder, pthread_self()))
1.2 ! noro 564: # ifdef HPUX_THREADS
! 565: # define LOCK() { if (!GC_test_and_clear(&GC_allocate_lock)) GC_lock(); }
! 566: /* The following is INCORRECT, since the memory model is too weak. */
! 567: # define UNLOCK() { GC_noop1(&GC_allocate_lock); \
! 568: *(volatile unsigned long *)(&GC_allocate_lock) = 1; }
1.1 noro 569: # else
1.2 ! noro 570: # define LOCK() { if (GC_test_and_set(&GC_allocate_lock, 1)) GC_lock(); }
! 571: # if __mips >= 3 && (defined (_ABIN32) || defined(_ABI64)) \
1.1 noro 572: && defined(_COMPILER_VERSION) && _COMPILER_VERSION >= 700
573: # define UNLOCK() __lock_release(&GC_allocate_lock)
1.2 ! noro 574: # else
1.1 noro 575: /* The function call in the following should prevent the */
576: /* compiler from moving assignments to below the UNLOCK. */
577: /* This is probably not necessary for ucode or gcc 2.8. */
578: /* It may be necessary for Ragnarok and future gcc */
579: /* versions. */
580: # define UNLOCK() { GC_noop1(&GC_allocate_lock); \
581: *(volatile unsigned long *)(&GC_allocate_lock) = 0; }
1.2 ! noro 582: # endif
1.1 noro 583: # endif
584: extern GC_bool GC_collecting;
585: # define ENTER_GC() \
586: { \
587: GC_collecting = 1; \
588: }
589: # define EXIT_GC() GC_collecting = 0;
590: # endif /* IRIX_THREADS || IRIX_JDK_THREADS */
591: # ifdef WIN32_THREADS
592: # include <windows.h>
593: GC_API CRITICAL_SECTION GC_allocate_ml;
594: # define LOCK() EnterCriticalSection(&GC_allocate_ml);
595: # define UNLOCK() LeaveCriticalSection(&GC_allocate_ml);
596: # endif
597: # ifndef SET_LOCK_HOLDER
598: # define SET_LOCK_HOLDER()
599: # define UNSET_LOCK_HOLDER()
600: # define I_HOLD_LOCK() FALSE
601: /* Used on platforms were locks can be reacquired, */
602: /* so it doesn't matter if we lie. */
603: # endif
604: # else
605: # define LOCK()
606: # define UNLOCK()
607: # endif
608: # ifndef SET_LOCK_HOLDER
609: # define SET_LOCK_HOLDER()
610: # define UNSET_LOCK_HOLDER()
611: # define I_HOLD_LOCK() FALSE
612: /* Used on platforms were locks can be reacquired, */
613: /* so it doesn't matter if we lie. */
614: # endif
615: # ifndef ENTER_GC
616: # define ENTER_GC()
617: # define EXIT_GC()
618: # endif
619:
620: # ifndef DCL_LOCK_STATE
621: # define DCL_LOCK_STATE
622: # endif
623: # ifndef FASTLOCK
624: # define FASTLOCK() LOCK()
625: # define FASTLOCK_SUCCEEDED() TRUE
626: # define FASTUNLOCK() UNLOCK()
627: # endif
628:
629: /* Delay any interrupts or signals that may abort this thread. Data */
630: /* structures are in a consistent state outside this pair of calls. */
631: /* ANSI C allows both to be empty (though the standard isn't very */
632: /* clear on that point). Standard malloc implementations are usually */
633: /* neither interruptable nor thread-safe, and thus correspond to */
634: /* empty definitions. */
635: # ifdef PCR
636: # define DISABLE_SIGNALS() \
637: PCR_Th_SetSigMask(PCR_allSigsBlocked,&GC_old_sig_mask)
638: # define ENABLE_SIGNALS() \
639: PCR_Th_SetSigMask(&GC_old_sig_mask, NIL)
640: # else
641: # if defined(SRC_M3) || defined(AMIGA) || defined(SOLARIS_THREADS) \
642: || defined(MSWIN32) || defined(MACOS) || defined(DJGPP) \
643: || defined(NO_SIGNALS) || defined(IRIX_THREADS) \
644: || defined(IRIX_JDK_THREADS) || defined(LINUX_THREADS)
645: /* Also useful for debugging. */
646: /* Should probably use thr_sigsetmask for SOLARIS_THREADS. */
647: # define DISABLE_SIGNALS()
648: # define ENABLE_SIGNALS()
649: # else
650: # define DISABLE_SIGNALS() GC_disable_signals()
651: void GC_disable_signals();
652: # define ENABLE_SIGNALS() GC_enable_signals()
653: void GC_enable_signals();
654: # endif
655: # endif
656:
657: /*
658: * Stop and restart mutator threads.
659: */
660: # ifdef PCR
661: # include "th/PCR_ThCtl.h"
662: # define STOP_WORLD() \
663: PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_stopNormal, \
664: PCR_allSigsBlocked, \
665: PCR_waitForever)
666: # define START_WORLD() \
667: PCR_ThCtl_SetExclusiveMode(PCR_ThCtl_ExclusiveMode_null, \
668: PCR_allSigsBlocked, \
669: PCR_waitForever);
670: # else
671: # if defined(SOLARIS_THREADS) || defined(WIN32_THREADS) \
672: || defined(IRIX_THREADS) || defined(LINUX_THREADS) \
1.2 ! noro 673: || defined(IRIX_JDK_THREADS) || defined(HPUX_THREADS)
1.1 noro 674: void GC_stop_world();
675: void GC_start_world();
676: # define STOP_WORLD() GC_stop_world()
677: # define START_WORLD() GC_start_world()
678: # else
679: # define STOP_WORLD()
680: # define START_WORLD()
681: # endif
682: # endif
683:
684: /* Abandon ship */
685: # ifdef PCR
686: # define ABORT(s) PCR_Base_Panic(s)
687: # else
688: # ifdef SMALL_CONFIG
689: # define ABORT(msg) abort();
690: # else
691: GC_API void GC_abort();
692: # define ABORT(msg) GC_abort(msg);
693: # endif
694: # endif
695:
696: /* Exit abnormally, but without making a mess (e.g. out of memory) */
697: # ifdef PCR
698: # define EXIT() PCR_Base_Exit(1,PCR_waitForever)
699: # else
700: # define EXIT() (void)exit(1)
701: # endif
702:
703: /* Print warning message, e.g. almost out of memory. */
704: # define WARN(msg,arg) (*GC_current_warn_proc)(msg, (GC_word)(arg))
705: extern GC_warn_proc GC_current_warn_proc;
706:
707: /*********************************/
708: /* */
709: /* Word-size-dependent defines */
710: /* */
711: /*********************************/
712:
713: #if CPP_WORDSZ == 32
714: # define WORDS_TO_BYTES(x) ((x)<<2)
715: # define BYTES_TO_WORDS(x) ((x)>>2)
716: # define LOGWL ((word)5) /* log[2] of CPP_WORDSZ */
717: # define modWORDSZ(n) ((n) & 0x1f) /* n mod size of word */
718: # if ALIGNMENT != 4
719: # define UNALIGNED
720: # endif
721: #endif
722:
723: #if CPP_WORDSZ == 64
724: # define WORDS_TO_BYTES(x) ((x)<<3)
725: # define BYTES_TO_WORDS(x) ((x)>>3)
726: # define LOGWL ((word)6) /* log[2] of CPP_WORDSZ */
727: # define modWORDSZ(n) ((n) & 0x3f) /* n mod size of word */
728: # if ALIGNMENT != 8
729: # define UNALIGNED
730: # endif
731: #endif
732:
733: #define WORDSZ ((word)CPP_WORDSZ)
734: #define SIGNB ((word)1 << (WORDSZ-1))
735: #define BYTES_PER_WORD ((word)(sizeof (word)))
736: #define ONES ((word)(-1))
737: #define divWORDSZ(n) ((n) >> LOGWL) /* divide n by size of word */
738:
739: /*********************/
740: /* */
741: /* Size Parameters */
742: /* */
743: /*********************/
744:
745: /* heap block size, bytes. Should be power of 2 */
746:
747: #ifndef HBLKSIZE
748: # ifdef SMALL_CONFIG
749: # define CPP_LOG_HBLKSIZE 10
750: # else
751: # if CPP_WORDSZ == 32
752: # define CPP_LOG_HBLKSIZE 12
753: # else
754: # define CPP_LOG_HBLKSIZE 13
755: # endif
756: # endif
757: #else
758: # if HBLKSIZE == 512
759: # define CPP_LOG_HBLKSIZE 9
760: # endif
761: # if HBLKSIZE == 1024
762: # define CPP_LOG_HBLKSIZE 10
763: # endif
764: # if HBLKSIZE == 2048
765: # define CPP_LOG_HBLKSIZE 11
766: # endif
767: # if HBLKSIZE == 4096
768: # define CPP_LOG_HBLKSIZE 12
769: # endif
770: # if HBLKSIZE == 8192
771: # define CPP_LOG_HBLKSIZE 13
772: # endif
773: # if HBLKSIZE == 16384
774: # define CPP_LOG_HBLKSIZE 14
775: # endif
776: # ifndef CPP_LOG_HBLKSIZE
777: --> fix HBLKSIZE
778: # endif
779: # undef HBLKSIZE
780: #endif
781: # define CPP_HBLKSIZE (1 << CPP_LOG_HBLKSIZE)
782: # define LOG_HBLKSIZE ((word)CPP_LOG_HBLKSIZE)
783: # define HBLKSIZE ((word)CPP_HBLKSIZE)
784:
785:
786: /* max size objects supported by freelist (larger objects may be */
787: /* allocated, but less efficiently) */
788:
789: #define CPP_MAXOBJSZ BYTES_TO_WORDS(CPP_HBLKSIZE/2)
790: #define MAXOBJSZ ((word)CPP_MAXOBJSZ)
791:
792: # define divHBLKSZ(n) ((n) >> LOG_HBLKSIZE)
793:
794: # define HBLK_PTR_DIFF(p,q) divHBLKSZ((ptr_t)p - (ptr_t)q)
795: /* Equivalent to subtracting 2 hblk pointers. */
796: /* We do it this way because a compiler should */
797: /* find it hard to use an integer division */
798: /* instead of a shift. The bundled SunOS 4.1 */
799: /* o.w. sometimes pessimizes the subtraction to */
800: /* involve a call to .div. */
801:
802: # define modHBLKSZ(n) ((n) & (HBLKSIZE-1))
803:
804: # define HBLKPTR(objptr) ((struct hblk *)(((word) (objptr)) & ~(HBLKSIZE-1)))
805:
806: # define HBLKDISPL(objptr) (((word) (objptr)) & (HBLKSIZE-1))
807:
808: /* Round up byte allocation requests to integral number of words, etc. */
809: # ifdef ADD_BYTE_AT_END
810: # define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + WORDS_TO_BYTES(1))
811: # ifdef ALIGN_DOUBLE
812: # define ALIGNED_WORDS(n) (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2)) & ~1)
813: # else
814: # define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
815: # endif
816: # define SMALL_OBJ(bytes) ((bytes) < WORDS_TO_BYTES(MAXOBJSZ))
817: # define ADD_SLOP(bytes) ((bytes)+1)
818: # else
819: # define ROUNDED_UP_WORDS(n) BYTES_TO_WORDS((n) + (WORDS_TO_BYTES(1) - 1))
820: # ifdef ALIGN_DOUBLE
821: # define ALIGNED_WORDS(n) \
822: (BYTES_TO_WORDS((n) + WORDS_TO_BYTES(2) - 1) & ~1)
823: # else
824: # define ALIGNED_WORDS(n) ROUNDED_UP_WORDS(n)
825: # endif
826: # define SMALL_OBJ(bytes) ((bytes) <= WORDS_TO_BYTES(MAXOBJSZ))
827: # define ADD_SLOP(bytes) (bytes)
828: # endif
829:
830:
831: /*
832: * Hash table representation of sets of pages. This assumes it is
833: * OK to add spurious entries to sets.
834: * Used by black-listing code, and perhaps by dirty bit maintenance code.
835: */
836:
837: # ifdef LARGE_CONFIG
838: # define LOG_PHT_ENTRIES 17
839: # else
840: # define LOG_PHT_ENTRIES 14 /* Collisions are likely if heap grows */
841: /* to more than 16K hblks = 64MB. */
842: /* Each hash table occupies 2K bytes. */
843: # endif
844: # define PHT_ENTRIES ((word)1 << LOG_PHT_ENTRIES)
845: # define PHT_SIZE (PHT_ENTRIES >> LOGWL)
846: typedef word page_hash_table[PHT_SIZE];
847:
848: # define PHT_HASH(addr) ((((word)(addr)) >> LOG_HBLKSIZE) & (PHT_ENTRIES - 1))
849:
850: # define get_pht_entry_from_index(bl, index) \
851: (((bl)[divWORDSZ(index)] >> modWORDSZ(index)) & 1)
852: # define set_pht_entry_from_index(bl, index) \
853: (bl)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index)
854: # define clear_pht_entry_from_index(bl, index) \
855: (bl)[divWORDSZ(index)] &= ~((word)1 << modWORDSZ(index))
856:
857:
858:
859: /********************************************/
860: /* */
861: /* H e a p B l o c k s */
862: /* */
863: /********************************************/
864:
865: /* heap block header */
866: #define HBLKMASK (HBLKSIZE-1)
867:
868: #define BITS_PER_HBLK (HBLKSIZE * 8)
869:
870: #define MARK_BITS_PER_HBLK (BITS_PER_HBLK/CPP_WORDSZ)
871: /* upper bound */
872: /* We allocate 1 bit/word. Only the first word */
873: /* in each object is actually marked. */
874:
875: # ifdef ALIGN_DOUBLE
876: # define MARK_BITS_SZ (((MARK_BITS_PER_HBLK + 2*CPP_WORDSZ - 1) \
877: / (2*CPP_WORDSZ))*2)
878: # else
879: # define MARK_BITS_SZ ((MARK_BITS_PER_HBLK + CPP_WORDSZ - 1)/CPP_WORDSZ)
880: # endif
881: /* Upper bound on number of mark words per heap block */
882:
883: struct hblkhdr {
884: word hb_sz; /* If in use, size in words, of objects in the block. */
885: /* if free, the size in bytes of the whole block */
886: struct hblk * hb_next; /* Link field for hblk free list */
887: /* and for lists of chunks waiting to be */
888: /* reclaimed. */
889: struct hblk * hb_prev; /* Backwards link for free list. */
890: word hb_descr; /* object descriptor for marking. See */
891: /* mark.h. */
892: char* hb_map; /* A pointer to a pointer validity map of the block. */
893: /* See GC_obj_map. */
894: /* Valid for all blocks with headers. */
895: /* Free blocks point to GC_invalid_map. */
896: unsigned char hb_obj_kind;
897: /* Kind of objects in the block. Each kind */
898: /* identifies a mark procedure and a set of */
899: /* list headers. Sometimes called regions. */
900: unsigned char hb_flags;
901: # define IGNORE_OFF_PAGE 1 /* Ignore pointers that do not */
902: /* point to the first page of */
903: /* this object. */
904: # define WAS_UNMAPPED 2 /* This is a free block, which has */
905: /* been unmapped from the address */
906: /* space. */
907: /* GC_remap must be invoked on it */
908: /* before it can be reallocated. */
909: /* Only set with USE_MUNMAP. */
910: unsigned short hb_last_reclaimed;
911: /* Value of GC_gc_no when block was */
912: /* last allocated or swept. May wrap. */
913: /* For a free block, this is maintained */
914: /* unly for USE_MUNMAP, and indicates */
915: /* when the header was allocated, or */
916: /* when the size of the block last */
917: /* changed. */
918: word hb_marks[MARK_BITS_SZ];
919: /* Bit i in the array refers to the */
920: /* object starting at the ith word (header */
921: /* INCLUDED) in the heap block. */
922: /* The lsb of word 0 is numbered 0. */
1.2 ! noro 923: /* Unused bits are invalid, and are */
! 924: /* occasionally set, e.g for uncollectable */
! 925: /* objects. */
1.1 noro 926: };
927:
928: /* heap block body */
929:
930: # define DISCARD_WORDS 0
931: /* Number of words to be dropped at the beginning of each block */
932: /* Must be a multiple of WORDSZ. May reasonably be nonzero */
933: /* on machines that don't guarantee longword alignment of */
934: /* pointers, so that the number of false hits is minimized. */
935: /* 0 and WORDSZ are probably the only reasonable values. */
936:
937: # define BODY_SZ ((HBLKSIZE-WORDS_TO_BYTES(DISCARD_WORDS))/sizeof(word))
938:
939: struct hblk {
940: # if (DISCARD_WORDS != 0)
941: word garbage[DISCARD_WORDS];
942: # endif
943: word hb_body[BODY_SZ];
944: };
945:
946: # define HDR_WORDS ((word)DISCARD_WORDS)
947: # define HDR_BYTES ((word)WORDS_TO_BYTES(DISCARD_WORDS))
948:
949: # define OBJ_SZ_TO_BLOCKS(sz) \
950: divHBLKSZ(HDR_BYTES + WORDS_TO_BYTES(sz) + HBLKSIZE-1)
951: /* Size of block (in units of HBLKSIZE) needed to hold objects of */
952: /* given sz (in words). */
953:
954: /* Object free list link */
955: # define obj_link(p) (*(ptr_t *)(p))
956:
957: /* The type of mark procedures. This really belongs in gc_mark.h. */
958: /* But we put it here, so that we can avoid scanning the mark proc */
959: /* table. */
960: typedef struct ms_entry * (*mark_proc)(/* word * addr, mark_stack_ptr,
961: mark_stack_limit, env */);
962: # define LOG_MAX_MARK_PROCS 6
963: # define MAX_MARK_PROCS (1 << LOG_MAX_MARK_PROCS)
964:
965: /* Root sets. Logically private to mark_rts.c. But we don't want the */
966: /* tables scanned, so we put them here. */
967: /* MAX_ROOT_SETS is the maximum number of ranges that can be */
968: /* registered as static roots. */
969: # ifdef LARGE_CONFIG
970: # define MAX_ROOT_SETS 4096
971: # else
972: # ifdef PCR
973: # define MAX_ROOT_SETS 1024
974: # else
975: # ifdef MSWIN32
976: # define MAX_ROOT_SETS 512
977: /* Under NT, we add only written pages, which can result */
978: /* in many small root sets. */
979: # else
980: # define MAX_ROOT_SETS 64
981: # endif
982: # endif
983: # endif
984:
985: # define MAX_EXCLUSIONS (MAX_ROOT_SETS/4)
986: /* Maximum number of segments that can be excluded from root sets. */
987:
988: /*
989: * Data structure for excluded static roots.
990: */
991: struct exclusion {
992: ptr_t e_start;
993: ptr_t e_end;
994: };
995:
996: /* Data structure for list of root sets. */
997: /* We keep a hash table, so that we can filter out duplicate additions. */
998: /* Under Win32, we need to do a better job of filtering overlaps, so */
999: /* we resort to sequential search, and pay the price. */
1000: struct roots {
1001: ptr_t r_start;
1002: ptr_t r_end;
1003: # ifndef MSWIN32
1004: struct roots * r_next;
1005: # endif
1006: GC_bool r_tmp;
1007: /* Delete before registering new dynamic libraries */
1008: };
1009:
1010: #ifndef MSWIN32
1011: /* Size of hash table index to roots. */
1012: # define LOG_RT_SIZE 6
1013: # define RT_SIZE (1 << LOG_RT_SIZE) /* Power of 2, may be != MAX_ROOT_SETS */
1014: #endif
1015:
1016: /* Lists of all heap blocks and free lists */
1017: /* as well as other random data structures */
1018: /* that should not be scanned by the */
1019: /* collector. */
1020: /* These are grouped together in a struct */
1021: /* so that they can be easily skipped by the */
1022: /* GC_mark routine. */
1023: /* The ordering is weird to make GC_malloc */
1024: /* faster by keeping the important fields */
1025: /* sufficiently close together that a */
1026: /* single load of a base register will do. */
1027: /* Scalars that could easily appear to */
1028: /* be pointers are also put here. */
1029: /* The main fields should precede any */
1030: /* conditionally included fields, so that */
1031: /* gc_inl.h will work even if a different set */
1032: /* of macros is defined when the client is */
1033: /* compiled. */
1034:
1035: struct _GC_arrays {
1036: word _heapsize;
1037: word _max_heapsize;
1038: ptr_t _last_heap_addr;
1039: ptr_t _prev_heap_addr;
1040: word _large_free_bytes;
1041: /* Total bytes contained in blocks on large object free */
1042: /* list. */
1043: word _words_allocd_before_gc;
1044: /* Number of words allocated before this */
1045: /* collection cycle. */
1046: word _words_allocd;
1047: /* Number of words allocated during this collection cycle */
1048: word _words_wasted;
1049: /* Number of words wasted due to internal fragmentation */
1050: /* in large objects, or due to dropping blacklisted */
1051: /* blocks, since last gc. Approximate. */
1052: word _words_finalized;
1053: /* Approximate number of words in objects (and headers) */
1054: /* That became ready for finalization in the last */
1055: /* collection. */
1056: word _non_gc_bytes_at_gc;
1057: /* Number of explicitly managed bytes of storage */
1058: /* at last collection. */
1059: word _mem_freed;
1060: /* Number of explicitly deallocated words of memory */
1061: /* since last collection. */
1062: mark_proc _mark_procs[MAX_MARK_PROCS];
1063: /* Table of user-defined mark procedures. There is */
1064: /* a small number of these, which can be referenced */
1065: /* by DS_PROC mark descriptors. See gc_mark.h. */
1066: ptr_t _objfreelist[MAXOBJSZ+1];
1067: /* free list for objects */
1068: ptr_t _aobjfreelist[MAXOBJSZ+1];
1069: /* free list for atomic objs */
1070:
1071: ptr_t _uobjfreelist[MAXOBJSZ+1];
1072: /* uncollectable but traced objs */
1073: /* objects on this and auobjfreelist */
1074: /* are always marked, except during */
1075: /* garbage collections. */
1076: # ifdef ATOMIC_UNCOLLECTABLE
1077: ptr_t _auobjfreelist[MAXOBJSZ+1];
1078: # endif
1079: /* uncollectable but traced objs */
1080:
1081: # ifdef GATHERSTATS
1082: word _composite_in_use;
1083: /* Number of words in accessible composite */
1084: /* objects. */
1085: word _atomic_in_use;
1086: /* Number of words in accessible atomic */
1087: /* objects. */
1088: # endif
1089: # ifdef USE_MUNMAP
1090: word _unmapped_bytes;
1091: # endif
1092: # ifdef MERGE_SIZES
1093: unsigned _size_map[WORDS_TO_BYTES(MAXOBJSZ+1)];
1094: /* Number of words to allocate for a given allocation request in */
1095: /* bytes. */
1096: # endif
1097:
1098: # ifdef STUBBORN_ALLOC
1099: ptr_t _sobjfreelist[MAXOBJSZ+1];
1100: # endif
1101: /* free list for immutable objects */
1102: ptr_t _obj_map[MAXOBJSZ+1];
1103: /* If not NIL, then a pointer to a map of valid */
1104: /* object addresses. _obj_map[sz][i] is j if the */
1105: /* address block_start+i is a valid pointer */
1106: /* to an object at */
1107: /* block_start+i&~3 - WORDS_TO_BYTES(j). */
1108: /* (If ALL_INTERIOR_POINTERS is defined, then */
1109: /* instead ((short *)(hb_map[sz])[i] is j if */
1110: /* block_start+WORDS_TO_BYTES(i) is in the */
1111: /* interior of an object starting at */
1112: /* block_start+WORDS_TO_BYTES(i-j)). */
1113: /* It is OBJ_INVALID if */
1114: /* block_start+WORDS_TO_BYTES(i) is not */
1115: /* valid as a pointer to an object. */
1116: /* We assume all values of j <= OBJ_INVALID. */
1117: /* The zeroth entry corresponds to large objects.*/
1118: # ifdef ALL_INTERIOR_POINTERS
1119: # define map_entry_type short
1120: # define OBJ_INVALID 0x7fff
1121: # define MAP_ENTRY(map, bytes) \
1122: (((map_entry_type *)(map))[BYTES_TO_WORDS(bytes)])
1123: # define MAP_ENTRIES BYTES_TO_WORDS(HBLKSIZE)
1124: # define MAP_SIZE (MAP_ENTRIES * sizeof(map_entry_type))
1125: # define OFFSET_VALID(displ) TRUE
1126: # define CPP_MAX_OFFSET (HBLKSIZE - HDR_BYTES - 1)
1127: # define MAX_OFFSET ((word)CPP_MAX_OFFSET)
1128: # else
1129: # define map_entry_type char
1130: # define OBJ_INVALID 0x7f
1131: # define MAP_ENTRY(map, bytes) \
1132: (map)[bytes]
1133: # define MAP_ENTRIES HBLKSIZE
1134: # define MAP_SIZE MAP_ENTRIES
1135: # define CPP_MAX_OFFSET (WORDS_TO_BYTES(OBJ_INVALID) - 1)
1136: # define MAX_OFFSET ((word)CPP_MAX_OFFSET)
1137: # define VALID_OFFSET_SZ \
1138: (CPP_MAX_OFFSET > WORDS_TO_BYTES(CPP_MAXOBJSZ)? \
1139: CPP_MAX_OFFSET+1 \
1140: : WORDS_TO_BYTES(CPP_MAXOBJSZ)+1)
1141: char _valid_offsets[VALID_OFFSET_SZ];
1142: /* GC_valid_offsets[i] == TRUE ==> i */
1143: /* is registered as a displacement. */
1144: # define OFFSET_VALID(displ) GC_valid_offsets[displ]
1145: char _modws_valid_offsets[sizeof(word)];
1146: /* GC_valid_offsets[i] ==> */
1147: /* GC_modws_valid_offsets[i%sizeof(word)] */
1148: # endif
1149: # ifdef STUBBORN_ALLOC
1150: page_hash_table _changed_pages;
1151: /* Stubborn object pages that were changes since last call to */
1152: /* GC_read_changed. */
1153: page_hash_table _prev_changed_pages;
1154: /* Stubborn object pages that were changes before last call to */
1155: /* GC_read_changed. */
1156: # endif
1157: # if defined(PROC_VDB) || defined(MPROTECT_VDB)
1158: page_hash_table _grungy_pages; /* Pages that were dirty at last */
1159: /* GC_read_dirty. */
1160: # endif
1161: # ifdef MPROTECT_VDB
1162: VOLATILE page_hash_table _dirty_pages;
1163: /* Pages dirtied since last GC_read_dirty. */
1164: # endif
1165: # ifdef PROC_VDB
1166: page_hash_table _written_pages; /* Pages ever dirtied */
1167: # endif
1168: # ifdef LARGE_CONFIG
1169: # if CPP_WORDSZ > 32
1170: # define MAX_HEAP_SECTS 4096 /* overflows at roughly 64 GB */
1171: # else
1172: # define MAX_HEAP_SECTS 768 /* Separately added heap sections. */
1173: # endif
1174: # else
1175: # define MAX_HEAP_SECTS 256
1176: # endif
1177: struct HeapSect {
1178: ptr_t hs_start; word hs_bytes;
1179: } _heap_sects[MAX_HEAP_SECTS];
1180: # ifdef MSWIN32
1181: ptr_t _heap_bases[MAX_HEAP_SECTS];
1182: /* Start address of memory regions obtained from kernel. */
1183: # endif
1184: struct roots _static_roots[MAX_ROOT_SETS];
1185: # ifndef MSWIN32
1186: struct roots * _root_index[RT_SIZE];
1187: # endif
1188: struct exclusion _excl_table[MAX_EXCLUSIONS];
1189: /* Block header index; see gc_headers.h */
1190: bottom_index * _all_nils;
1191: bottom_index * _top_index [TOP_SZ];
1192: #ifdef SAVE_CALL_CHAIN
1193: struct callinfo _last_stack[NFRAMES]; /* Stack at last garbage collection.*/
1194: /* Useful for debugging mysterious */
1195: /* object disappearances. */
1196: /* In the multithreaded case, we */
1197: /* currently only save the calling */
1198: /* stack. */
1199: #endif
1200: };
1201:
1202: GC_API GC_FAR struct _GC_arrays GC_arrays;
1203:
1204: # define GC_objfreelist GC_arrays._objfreelist
1205: # define GC_aobjfreelist GC_arrays._aobjfreelist
1206: # define GC_uobjfreelist GC_arrays._uobjfreelist
1207: # ifdef ATOMIC_UNCOLLECTABLE
1208: # define GC_auobjfreelist GC_arrays._auobjfreelist
1209: # endif
1210: # define GC_sobjfreelist GC_arrays._sobjfreelist
1211: # define GC_valid_offsets GC_arrays._valid_offsets
1212: # define GC_modws_valid_offsets GC_arrays._modws_valid_offsets
1213: # ifdef STUBBORN_ALLOC
1214: # define GC_changed_pages GC_arrays._changed_pages
1215: # define GC_prev_changed_pages GC_arrays._prev_changed_pages
1216: # endif
1217: # define GC_obj_map GC_arrays._obj_map
1218: # define GC_last_heap_addr GC_arrays._last_heap_addr
1219: # define GC_prev_heap_addr GC_arrays._prev_heap_addr
1220: # define GC_words_allocd GC_arrays._words_allocd
1221: # define GC_words_wasted GC_arrays._words_wasted
1222: # define GC_large_free_bytes GC_arrays._large_free_bytes
1223: # define GC_words_finalized GC_arrays._words_finalized
1224: # define GC_non_gc_bytes_at_gc GC_arrays._non_gc_bytes_at_gc
1225: # define GC_mem_freed GC_arrays._mem_freed
1226: # define GC_mark_procs GC_arrays._mark_procs
1227: # define GC_heapsize GC_arrays._heapsize
1228: # define GC_max_heapsize GC_arrays._max_heapsize
1229: # define GC_words_allocd_before_gc GC_arrays._words_allocd_before_gc
1230: # define GC_heap_sects GC_arrays._heap_sects
1231: # define GC_last_stack GC_arrays._last_stack
1232: # ifdef USE_MUNMAP
1233: # define GC_unmapped_bytes GC_arrays._unmapped_bytes
1234: # endif
1235: # ifdef MSWIN32
1236: # define GC_heap_bases GC_arrays._heap_bases
1237: # endif
1238: # define GC_static_roots GC_arrays._static_roots
1239: # define GC_root_index GC_arrays._root_index
1240: # define GC_excl_table GC_arrays._excl_table
1241: # define GC_all_nils GC_arrays._all_nils
1242: # define GC_top_index GC_arrays._top_index
1243: # if defined(PROC_VDB) || defined(MPROTECT_VDB)
1244: # define GC_grungy_pages GC_arrays._grungy_pages
1245: # endif
1246: # ifdef MPROTECT_VDB
1247: # define GC_dirty_pages GC_arrays._dirty_pages
1248: # endif
1249: # ifdef PROC_VDB
1250: # define GC_written_pages GC_arrays._written_pages
1251: # endif
1252: # ifdef GATHERSTATS
1253: # define GC_composite_in_use GC_arrays._composite_in_use
1254: # define GC_atomic_in_use GC_arrays._atomic_in_use
1255: # endif
1256: # ifdef MERGE_SIZES
1257: # define GC_size_map GC_arrays._size_map
1258: # endif
1259:
1260: # define beginGC_arrays ((ptr_t)(&GC_arrays))
1261: # define endGC_arrays (((ptr_t)(&GC_arrays)) + (sizeof GC_arrays))
1262:
1263: /* Object kinds: */
1264: # define MAXOBJKINDS 16
1265:
1266: extern struct obj_kind {
1267: ptr_t *ok_freelist; /* Array of free listheaders for this kind of object */
1268: /* Point either to GC_arrays or to storage allocated */
1269: /* with GC_scratch_alloc. */
1270: struct hblk **ok_reclaim_list;
1271: /* List headers for lists of blocks waiting to be */
1272: /* swept. */
1273: word ok_descriptor; /* Descriptor template for objects in this */
1274: /* block. */
1275: GC_bool ok_relocate_descr;
1276: /* Add object size in bytes to descriptor */
1277: /* template to obtain descriptor. Otherwise */
1278: /* template is used as is. */
1279: GC_bool ok_init; /* Clear objects before putting them on the free list. */
1280: } GC_obj_kinds[MAXOBJKINDS];
1281:
1282: # define endGC_obj_kinds (((ptr_t)(&GC_obj_kinds)) + (sizeof GC_obj_kinds))
1283:
1284: # define end_gc_area ((ptr_t)endGC_arrays == (ptr_t)(&GC_obj_kinds) ? \
1285: endGC_obj_kinds : endGC_arrays)
1286:
1287: /* Predefined kinds: */
1288: # define PTRFREE 0
1289: # define NORMAL 1
1290: # define UNCOLLECTABLE 2
1291: # ifdef ATOMIC_UNCOLLECTABLE
1292: # define AUNCOLLECTABLE 3
1293: # define STUBBORN 4
1294: # define IS_UNCOLLECTABLE(k) (((k) & ~1) == UNCOLLECTABLE)
1295: # else
1296: # define STUBBORN 3
1297: # define IS_UNCOLLECTABLE(k) ((k) == UNCOLLECTABLE)
1298: # endif
1299:
1300: extern int GC_n_kinds;
1301:
1302: GC_API word GC_fo_entries;
1303:
1304: extern word GC_n_heap_sects; /* Number of separately added heap */
1305: /* sections. */
1306:
1307: extern word GC_page_size;
1308:
1309: # ifdef MSWIN32
1310: extern word GC_n_heap_bases; /* See GC_heap_bases. */
1311: # endif
1312:
1313: extern word GC_total_stack_black_listed;
1314: /* Number of bytes on stack blacklist. */
1315:
1316: extern word GC_black_list_spacing;
1317: /* Average number of bytes between blacklisted */
1318: /* blocks. Approximate. */
1319: /* Counts only blocks that are */
1320: /* "stack-blacklisted", i.e. that are */
1321: /* problematic in the interior of an object. */
1322:
1323: extern char * GC_invalid_map;
1324: /* Pointer to the nowhere valid hblk map */
1325: /* Blocks pointing to this map are free. */
1326:
1327: extern struct hblk * GC_hblkfreelist[];
1328: /* List of completely empty heap blocks */
1329: /* Linked through hb_next field of */
1330: /* header structure associated with */
1331: /* block. */
1332:
1333: extern GC_bool GC_is_initialized; /* GC_init() has been run. */
1334:
1335: extern GC_bool GC_objects_are_marked; /* There are marked objects in */
1336: /* the heap. */
1337:
1338: #ifndef SMALL_CONFIG
1339: extern GC_bool GC_incremental;
1340: /* Using incremental/generational collection. */
1341: #else
1342: # define GC_incremental TRUE
1343: /* Hopefully allow optimizer to remove some code. */
1344: #endif
1345:
1346: extern GC_bool GC_dirty_maintained;
1347: /* Dirty bits are being maintained, */
1348: /* either for incremental collection, */
1349: /* or to limit the root set. */
1350:
1351: extern word GC_root_size; /* Total size of registered root sections */
1352:
1353: extern GC_bool GC_debugging_started; /* GC_debug_malloc has been called. */
1354:
1355: extern ptr_t GC_least_plausible_heap_addr;
1356: extern ptr_t GC_greatest_plausible_heap_addr;
1357: /* Bounds on the heap. Guaranteed valid */
1358: /* Likely to include future heap expansion. */
1359:
1360: /* Operations */
1361: # ifndef abs
1362: # define abs(x) ((x) < 0? (-(x)) : (x))
1363: # endif
1364:
1365:
1366: /* Marks are in a reserved area in */
1367: /* each heap block. Each word has one mark bit associated */
1368: /* with it. Only those corresponding to the beginning of an */
1369: /* object are used. */
1370:
1371:
1372: /* Mark bit operations */
1373:
1374: /*
1375: * Retrieve, set, clear the mark bit corresponding
1376: * to the nth word in a given heap block.
1377: *
1378: * (Recall that bit n corresponds to object beginning at word n
1379: * relative to the beginning of the block, including unused words)
1380: */
1381:
1382: # define mark_bit_from_hdr(hhdr,n) (((hhdr)->hb_marks[divWORDSZ(n)] \
1383: >> (modWORDSZ(n))) & (word)1)
1384: # define set_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
1385: |= (word)1 << modWORDSZ(n)
1386:
1387: # define clear_mark_bit_from_hdr(hhdr,n) (hhdr)->hb_marks[divWORDSZ(n)] \
1388: &= ~((word)1 << modWORDSZ(n))
1389:
1390: /* Important internal collector routines */
1391:
1392: ptr_t GC_approx_sp();
1393:
1394: GC_bool GC_should_collect();
1395: #ifdef PRESERVE_LAST
1396: GC_bool GC_in_last_heap_sect(/* ptr_t */);
1397: /* In last added heap section? If so, avoid breaking up. */
1398: #endif
1399: void GC_apply_to_all_blocks(/*fn, client_data*/);
1400: /* Invoke fn(hbp, client_data) for each */
1401: /* allocated heap block. */
1402: struct hblk * GC_next_used_block(/* struct hblk * h */);
1403: /* Return first in-use block >= h */
1404: struct hblk * GC_prev_block(/* struct hblk * h */);
1405: /* Return last block <= h. Returned block */
1406: /* is managed by GC, but may or may not be in */
1407: /* use. */
1408: void GC_mark_init();
1409: void GC_clear_marks(); /* Clear mark bits for all heap objects. */
1410: void GC_invalidate_mark_state(); /* Tell the marker that marked */
1411: /* objects may point to unmarked */
1412: /* ones, and roots may point to */
1413: /* unmarked objects. */
1414: /* Reset mark stack. */
1415: void GC_mark_from_mark_stack(); /* Mark from everything on the mark stack. */
1416: /* Return after about one pages worth of */
1417: /* work. */
1418: GC_bool GC_mark_stack_empty();
1419: GC_bool GC_mark_some(/* cold_gc_frame */);
1420: /* Perform about one pages worth of marking */
1421: /* work of whatever kind is needed. Returns */
1422: /* quickly if no collection is in progress. */
1423: /* Return TRUE if mark phase finished. */
1424: void GC_initiate_gc(); /* initiate collection. */
1425: /* If the mark state is invalid, this */
1426: /* becomes full colleection. Otherwise */
1427: /* it's partial. */
1428: void GC_push_all(/*b,t*/); /* Push everything in a range */
1429: /* onto mark stack. */
1430: void GC_push_dirty(/*b,t*/); /* Push all possibly changed */
1431: /* subintervals of [b,t) onto */
1432: /* mark stack. */
1433: #ifndef SMALL_CONFIG
1434: void GC_push_conditional(/* ptr_t b, ptr_t t, GC_bool all*/);
1435: #else
1436: # define GC_push_conditional(b, t, all) GC_push_all(b, t)
1437: #endif
1438: /* Do either of the above, depending */
1439: /* on the third arg. */
1440: void GC_push_all_stack(/*b,t*/); /* As above, but consider */
1441: /* interior pointers as valid */
1442: void GC_push_all_eager(/*b,t*/); /* Same as GC_push_all_stack, but */
1443: /* ensures that stack is scanned */
1444: /* immediately, not just scheduled */
1445: /* for scanning. */
1446: #ifndef THREADS
1447: void GC_push_all_stack_partially_eager(/* bottom, top, cold_gc_frame */);
1448: /* Similar to GC_push_all_eager, but only the */
1449: /* part hotter than cold_gc_frame is scanned */
1450: /* immediately. Needed to endure that callee- */
1451: /* save registers are not missed. */
1452: #else
1453: /* In the threads case, we push part of the current thread stack */
1454: /* with GC_push_all_eager when we push the registers. This gets the */
1455: /* callee-save registers that may disappear. The remainder of the */
1456: /* stacks are scheduled for scanning in *GC_push_other_roots, which */
1457: /* is thread-package-specific. */
1458: #endif
1459: void GC_push_current_stack(/* ptr_t cold_gc_frame */);
1460: /* Push enough of the current stack eagerly to */
1461: /* ensure that callee-save registers saved in */
1462: /* GC frames are scanned. */
1463: /* In the non-threads case, schedule entire */
1464: /* stack for scanning. */
1465: void GC_push_roots(/* GC_bool all, ptr_t cold_gc_frame */);
1466: /* Push all or dirty roots. */
1467: extern void (*GC_push_other_roots)();
1468: /* Push system or application specific roots */
1469: /* onto the mark stack. In some environments */
1470: /* (e.g. threads environments) this is */
1471: /* predfined to be non-zero. A client supplied */
1472: /* replacement should also call the original */
1473: /* function. */
1474: extern void (*GC_start_call_back)(/* void */);
1475: /* Called at start of full collections. */
1476: /* Not called if 0. Called with allocation */
1477: /* lock held. */
1478: /* 0 by default. */
1479: void GC_push_regs(); /* Push register contents onto mark stack. */
1.2 ! noro 1480: /* If NURSERY is defined, the default push */
! 1481: /* action can be overridden with GC_push_proc */
1.1 noro 1482: void GC_remark(); /* Mark from all marked objects. Used */
1483: /* only if we had to drop something. */
1.2 ! noro 1484:
! 1485: # ifdef NURSERY
! 1486: extern void (*GC_push_proc)(ptr_t);
! 1487: # endif
1.1 noro 1488: # if defined(MSWIN32)
1489: void __cdecl GC_push_one();
1490: # else
1491: void GC_push_one(/*p*/); /* If p points to an object, mark it */
1492: /* and push contents on the mark stack */
1493: # endif
1494: void GC_push_one_checked(/*p*/); /* Ditto, omits plausibility test */
1495: void GC_push_marked(/* struct hblk h, hdr * hhdr */);
1496: /* Push contents of all marked objects in h onto */
1497: /* mark stack. */
1498: #ifdef SMALL_CONFIG
1499: # define GC_push_next_marked_dirty(h) GC_push_next_marked(h)
1500: #else
1501: struct hblk * GC_push_next_marked_dirty(/* h */);
1502: /* Invoke GC_push_marked on next dirty block above h. */
1503: /* Return a pointer just past the end of this block. */
1504: #endif /* !SMALL_CONFIG */
1505: struct hblk * GC_push_next_marked(/* h */);
1506: /* Ditto, but also mark from clean pages. */
1507: struct hblk * GC_push_next_marked_uncollectable(/* h */);
1508: /* Ditto, but mark only from uncollectable pages. */
1509: GC_bool GC_stopped_mark(); /* Stop world and mark from all roots */
1510: /* and rescuers. */
1511: void GC_clear_hdr_marks(/* hhdr */); /* Clear the mark bits in a header */
1512: void GC_set_hdr_marks(/* hhdr */); /* Set the mark bits in a header */
1513: void GC_add_roots_inner();
1514: GC_bool GC_is_static_root(/* ptr_t p */);
1515: /* Is the address p in one of the registered static */
1516: /* root sections? */
1517: void GC_register_dynamic_libraries();
1518: /* Add dynamic library data sections to the root set. */
1519:
1520: /* Machine dependent startup routines */
1521: ptr_t GC_get_stack_base();
1522: void GC_register_data_segments();
1523:
1524: /* Black listing: */
1525: void GC_bl_init();
1526: # ifndef ALL_INTERIOR_POINTERS
1527: void GC_add_to_black_list_normal(/* bits, maybe source */);
1528: /* Register bits as a possible future false */
1529: /* reference from the heap or static data */
1530: # ifdef PRINT_BLACK_LIST
1531: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
1532: GC_add_to_black_list_normal(bits, source)
1533: # else
1534: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
1535: GC_add_to_black_list_normal(bits)
1536: # endif
1537: # else
1538: # ifdef PRINT_BLACK_LIST
1539: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
1540: GC_add_to_black_list_stack(bits, source)
1541: # else
1542: # define GC_ADD_TO_BLACK_LIST_NORMAL(bits, source) \
1543: GC_add_to_black_list_stack(bits)
1544: # endif
1545: # endif
1546:
1547: void GC_add_to_black_list_stack(/* bits, maybe source */);
1548: struct hblk * GC_is_black_listed(/* h, len */);
1549: /* If there are likely to be false references */
1550: /* to a block starting at h of the indicated */
1551: /* length, then return the next plausible */
1552: /* starting location for h that might avoid */
1553: /* these false references. */
1554: void GC_promote_black_lists();
1555: /* Declare an end to a black listing phase. */
1556: void GC_unpromote_black_lists();
1557: /* Approximately undo the effect of the above. */
1558: /* This actually loses some information, but */
1559: /* only in a reasonably safe way. */
1560: word GC_number_stack_black_listed(/*struct hblk *start, struct hblk *endp1 */);
1561: /* Return the number of (stack) blacklisted */
1562: /* blocks in the range for statistical */
1563: /* purposes. */
1564:
1565: ptr_t GC_scratch_alloc(/*bytes*/);
1566: /* GC internal memory allocation for */
1567: /* small objects. Deallocation is not */
1568: /* possible. */
1569:
1570: /* Heap block layout maps: */
1571: void GC_invalidate_map(/* hdr */);
1572: /* Remove the object map associated */
1573: /* with the block. This identifies */
1574: /* the block as invalid to the mark */
1575: /* routines. */
1576: GC_bool GC_add_map_entry(/*sz*/);
1577: /* Add a heap block map for objects of */
1578: /* size sz to obj_map. */
1579: /* Return FALSE on failure. */
1580: void GC_register_displacement_inner(/*offset*/);
1581: /* Version of GC_register_displacement */
1582: /* that assumes lock is already held */
1583: /* and signals are already disabled. */
1584:
1585: /* hblk allocation: */
1586: void GC_new_hblk(/*size_in_words, kind*/);
1587: /* Allocate a new heap block, and build */
1588: /* a free list in it. */
1589: struct hblk * GC_allochblk(/*size_in_words, kind*/);
1590: /* Allocate a heap block, clear it if */
1591: /* for composite objects, inform */
1592: /* the marker that block is valid */
1593: /* for objects of indicated size. */
1594: /* sz < 0 ==> atomic. */
1595: void GC_freehblk(); /* Deallocate a heap block and mark it */
1596: /* as invalid. */
1597:
1598: /* Misc GC: */
1599: void GC_init_inner();
1600: GC_bool GC_expand_hp_inner();
1601: void GC_start_reclaim(/*abort_if_found*/);
1602: /* Restore unmarked objects to free */
1603: /* lists, or (if abort_if_found is */
1604: /* TRUE) report them. */
1605: /* Sweeping of small object pages is */
1606: /* largely deferred. */
1607: void GC_continue_reclaim(/*size, kind*/);
1608: /* Sweep pages of the given size and */
1609: /* kind, as long as possible, and */
1610: /* as long as the corr. free list is */
1611: /* empty. */
1612: void GC_reclaim_or_delete_all();
1613: /* Arrange for all reclaim lists to be */
1614: /* empty. Judiciously choose between */
1615: /* sweeping and discarding each page. */
1616: GC_bool GC_reclaim_all(/* GC_stop_func f*/);
1617: /* Reclaim all blocks. Abort (in a */
1618: /* consistent state) if f returns TRUE. */
1619: GC_bool GC_block_empty(/* hhdr */); /* Block completely unmarked? */
1620: GC_bool GC_never_stop_func(); /* Returns FALSE. */
1621: GC_bool GC_try_to_collect_inner(/* GC_stop_func f */);
1622: /* Collect; caller must have acquired */
1623: /* lock and disabled signals. */
1624: /* Collection is aborted if f returns */
1625: /* TRUE. Returns TRUE if it completes */
1626: /* successfully. */
1627: # define GC_gcollect_inner() \
1628: (void) GC_try_to_collect_inner(GC_never_stop_func)
1629: void GC_finish_collection(); /* Finish collection. Mark bits are */
1630: /* consistent and lock is still held. */
1631: GC_bool GC_collect_or_expand(/* needed_blocks */);
1632: /* Collect or expand heap in an attempt */
1633: /* make the indicated number of free */
1634: /* blocks available. Should be called */
1635: /* until the blocks are available or */
1636: /* until it fails by returning FALSE. */
1637: GC_API void GC_init(); /* Initialize collector. */
1638: void GC_collect_a_little_inner(/* int n */);
1639: /* Do n units worth of garbage */
1640: /* collection work, if appropriate. */
1641: /* A unit is an amount appropriate for */
1642: /* HBLKSIZE bytes of allocation. */
1643: ptr_t GC_generic_malloc(/* bytes, kind */);
1644: /* Allocate an object of the given */
1645: /* kind. By default, there are only */
1646: /* a few kinds: composite(pointerfree), */
1647: /* atomic, uncollectable, etc. */
1648: /* We claim it's possible for clever */
1649: /* client code that understands GC */
1650: /* internals to add more, e.g. to */
1651: /* communicate object layout info */
1652: /* to the collector. */
1653: ptr_t GC_generic_malloc_ignore_off_page(/* bytes, kind */);
1654: /* As above, but pointers past the */
1655: /* first page of the resulting object */
1656: /* are ignored. */
1657: ptr_t GC_generic_malloc_inner(/* bytes, kind */);
1658: /* Ditto, but I already hold lock, etc. */
1659: ptr_t GC_generic_malloc_words_small GC_PROTO((size_t words, int kind));
1660: /* As above, but size in units of words */
1661: /* Bypasses MERGE_SIZES. Assumes */
1662: /* words <= MAXOBJSZ. */
1663: ptr_t GC_generic_malloc_inner_ignore_off_page(/* bytes, kind */);
1664: /* Allocate an object, where */
1665: /* the client guarantees that there */
1666: /* will always be a pointer to the */
1667: /* beginning of the object while the */
1668: /* object is live. */
1669: ptr_t GC_allocobj(/* sz_inn_words, kind */);
1670: /* Make the indicated */
1671: /* free list nonempty, and return its */
1672: /* head. */
1673:
1674: void GC_init_headers();
1675: GC_bool GC_install_header(/*h*/);
1676: /* Install a header for block h. */
1677: /* Return FALSE on failure. */
1678: GC_bool GC_install_counts(/*h, sz*/);
1679: /* Set up forwarding counts for block */
1680: /* h of size sz. */
1681: /* Return FALSE on failure. */
1682: void GC_remove_header(/*h*/);
1683: /* Remove the header for block h. */
1684: void GC_remove_counts(/*h, sz*/);
1685: /* Remove forwarding counts for h. */
1686: hdr * GC_find_header(/*p*/); /* Debugging only. */
1687:
1688: void GC_finalize(); /* Perform all indicated finalization actions */
1689: /* on unmarked objects. */
1690: /* Unreachable finalizable objects are enqueued */
1691: /* for processing by GC_invoke_finalizers. */
1692: /* Invoked with lock. */
1693:
1694: void GC_add_to_heap(/*p, bytes*/);
1695: /* Add a HBLKSIZE aligned chunk to the heap. */
1696:
1697: void GC_print_obj(/* ptr_t p */);
1698: /* P points to somewhere inside an object with */
1699: /* debugging info. Print a human readable */
1700: /* description of the object to stderr. */
1701: extern void (*GC_check_heap)();
1702: /* Check that all objects in the heap with */
1703: /* debugging info are intact. Print */
1704: /* descriptions of any that are not. */
1705: extern void (*GC_print_heap_obj)(/* ptr_t p */);
1706: /* If possible print s followed by a more */
1707: /* detailed description of the object */
1708: /* referred to by p. */
1709:
1710: /* Memory unmapping: */
1711: #ifdef USE_MUNMAP
1712: void GC_unmap_old(void);
1713: void GC_merge_unmapped(void);
1714: void GC_unmap(ptr_t start, word bytes);
1715: void GC_remap(ptr_t start, word bytes);
1716: void GC_unmap_gap(ptr_t start1, word bytes1, ptr_t start2, word bytes2);
1717: #endif
1718:
1719: /* Virtual dirty bit implementation: */
1720: /* Each implementation exports the following: */
1721: void GC_read_dirty(); /* Retrieve dirty bits. */
1722: GC_bool GC_page_was_dirty(/* struct hblk * h */);
1723: /* Read retrieved dirty bits. */
1724: GC_bool GC_page_was_ever_dirty(/* struct hblk * h */);
1725: /* Could the page contain valid heap pointers? */
1726: void GC_is_fresh(/* struct hblk * h, word number_of_blocks */);
1727: /* Assert the region currently contains no */
1728: /* valid pointers. */
1729: void GC_write_hint(/* struct hblk * h */);
1730: /* h is about to be written. */
1731: void GC_dirty_init();
1732:
1733: /* Slow/general mark bit manipulation: */
1734: GC_API GC_bool GC_is_marked();
1735: void GC_clear_mark_bit();
1736: void GC_set_mark_bit();
1737:
1738: /* Stubborn objects: */
1739: void GC_read_changed(); /* Analogous to GC_read_dirty */
1740: GC_bool GC_page_was_changed(/* h */); /* Analogous to GC_page_was_dirty */
1741: void GC_clean_changing_list(); /* Collect obsolete changing list entries */
1742: void GC_stubborn_init();
1743:
1744: /* Debugging print routines: */
1745: void GC_print_block_list();
1746: void GC_print_hblkfreelist();
1747: void GC_print_heap_sects();
1748: void GC_print_static_roots();
1749: void GC_dump();
1750:
1751: #ifdef KEEP_BACK_PTRS
1752: void GC_store_back_pointer(ptr_t source, ptr_t dest);
1753: void GC_marked_for_finalization(ptr_t dest);
1754: # define GC_STORE_BACK_PTR(source, dest) GC_store_back_pointer(source, dest)
1755: # define GC_MARKED_FOR_FINALIZATION(dest) GC_marked_for_finalization(dest)
1756: #else
1757: # define GC_STORE_BACK_PTR(source, dest)
1758: # define GC_MARKED_FOR_FINALIZATION(dest)
1759: #endif
1760:
1761: /* Make arguments appear live to compiler */
1762: # ifdef __WATCOMC__
1763: void GC_noop(void*, ...);
1764: # else
1765: GC_API void GC_noop();
1766: # endif
1767:
1768: void GC_noop1(/* word arg */);
1769:
1770: /* Logging and diagnostic output: */
1771: GC_API void GC_printf GC_PROTO((char * format, long, long, long, long, long, long));
1772: /* A version of printf that doesn't allocate, */
1773: /* is restricted to long arguments, and */
1774: /* (unfortunately) doesn't use varargs for */
1775: /* portability. Restricted to 6 args and */
1776: /* 1K total output length. */
1777: /* (We use sprintf. Hopefully that doesn't */
1778: /* allocate for long arguments.) */
1779: # define GC_printf0(f) GC_printf(f, 0l, 0l, 0l, 0l, 0l, 0l)
1780: # define GC_printf1(f,a) GC_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
1781: # define GC_printf2(f,a,b) GC_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
1782: # define GC_printf3(f,a,b,c) GC_printf(f, (long)a, (long)b, (long)c, 0l, 0l, 0l)
1783: # define GC_printf4(f,a,b,c,d) GC_printf(f, (long)a, (long)b, (long)c, \
1784: (long)d, 0l, 0l)
1785: # define GC_printf5(f,a,b,c,d,e) GC_printf(f, (long)a, (long)b, (long)c, \
1786: (long)d, (long)e, 0l)
1787: # define GC_printf6(f,a,b,c,d,e,g) GC_printf(f, (long)a, (long)b, (long)c, \
1788: (long)d, (long)e, (long)g)
1789:
1790: void GC_err_printf(/* format, a, b, c, d, e, f */);
1791: # define GC_err_printf0(f) GC_err_puts(f)
1792: # define GC_err_printf1(f,a) GC_err_printf(f, (long)a, 0l, 0l, 0l, 0l, 0l)
1793: # define GC_err_printf2(f,a,b) GC_err_printf(f, (long)a, (long)b, 0l, 0l, 0l, 0l)
1794: # define GC_err_printf3(f,a,b,c) GC_err_printf(f, (long)a, (long)b, (long)c, \
1795: 0l, 0l, 0l)
1796: # define GC_err_printf4(f,a,b,c,d) GC_err_printf(f, (long)a, (long)b, \
1797: (long)c, (long)d, 0l, 0l)
1798: # define GC_err_printf5(f,a,b,c,d,e) GC_err_printf(f, (long)a, (long)b, \
1799: (long)c, (long)d, \
1800: (long)e, 0l)
1801: # define GC_err_printf6(f,a,b,c,d,e,g) GC_err_printf(f, (long)a, (long)b, \
1802: (long)c, (long)d, \
1803: (long)e, (long)g)
1804: /* Ditto, writes to stderr. */
1805:
1806: void GC_err_puts(/* char *s */);
1807: /* Write s to stderr, don't buffer, don't add */
1808: /* newlines, don't ... */
1809:
1810:
1811: # ifdef GC_ASSERTIONS
1812: # define GC_ASSERT(expr) if(!(expr)) {\
1813: GC_err_printf2("Assertion failure: %s:%ld\n", \
1814: __FILE__, (unsigned long)__LINE__); \
1815: ABORT("assertion failure"); }
1816: # else
1817: # define GC_ASSERT(expr)
1818: # endif
1819:
1820: # endif /* GC_PRIVATE_H */
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