Newer
Older
* Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
* Copyright (c) 1998 by Silicon Graphics. All rights reserved.
* Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
*
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
*
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*
*/
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
# include <signal.h>
# include <sys/types.h>
# endif
/*
* Separate free lists are maintained for different sized objects
* up to MAXOBJSZ.
* The call GC_allocobj(i,k) ensures that the freelist for
* kind k objects of size i points to a non-empty
* free list. It returns a pointer to the first entry on the free list.
* In a single-threaded world, GC_allocobj may be called to allocate
* an object of (small) size i as follows:
*
* opp = &(GC_objfreelist[i]);
* if (*opp == 0) GC_allocobj(i, NORMAL);
* ptr = *opp;
* *opp = obj_link(ptr);
*
* Note that this is very fast if the free list is non-empty; it should
* only involve the execution of 4 or 5 simple instructions.
* All composite objects on freelists are cleared, except for
* their first word.
*/
/*
* The allocator uses GC_allochblk to allocate large chunks of objects.
* These chunks all start on addresses which are multiples of
* HBLKSZ. Each allocated chunk has an associated header,
* which can be located quickly based on the address of the chunk.
* (See headers.c for details.)
* This makes it possible to check quickly whether an
* arbitrary address corresponds to an object administered by the
* allocator.
*/
word GC_non_gc_bytes = 0; /* Number of bytes not intended to be collected */
word GC_gc_no = 0;
int GC_incremental = 0; /* By default, stop the world. */
int GC_parallel = FALSE; /* By default, parallel GC is off. */
int GC_full_freq = 19; /* Every 20th collection is a full */
/* collection, whether we need it */
/* or not. */
GC_bool GC_need_full_gc = FALSE;
/* Need full GC do to heap growth. */
#ifdef THREADS
GC_bool GC_world_stopped = FALSE;
# define IF_THREADS(x) x
#else
# define IF_THREADS(x)
#endif
word GC_used_heap_size_after_full = 0;
char * GC_copyright[] =
{"Copyright 1988,1989 Hans-J. Boehm and Alan J. Demers ",
"Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. ",
"Copyright (c) 1996-1998 by Silicon Graphics. All rights reserved. ",
"Copyright (c) 1999-2001 by Hewlett-Packard Company. All rights reserved. ",
"THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY",
" EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.",
"See source code for details." };
# include "version.h"
#if defined(SAVE_CALL_CHAIN) && \
!(defined(REDIRECT_MALLOC) && defined(GC_HAVE_BUILTIN_BACKTRACE))
# define SAVE_CALL_CHAIN_IN_GC
/* This is only safe if the call chain save mechanism won't end up */
/* calling GC_malloc. The GNU C library documentation suggests */
/* that backtrace doesn't use malloc, but at least the initial */
/* call in some versions does seem to invoke the dynamic linker, */
/* which uses malloc. */
#endif
/* some more variables */
extern signed_word GC_mem_found; /* Number of reclaimed longwords */
/* after garbage collection */
GC_bool GC_dont_expand = 0;
/* Collection is in progress, or was abandoned. */
int GC_never_stop_func GC_PROTO((void)) { return(0); }
CLOCK_TYPE GC_start_time; /* Time at which we stopped world. */
/* used only in GC_timeout_stop_func. */
int GC_n_attempts = 0; /* Number of attempts at finishing */
#if defined(SMALL_CONFIG) || defined(NO_CLOCK)
# define GC_timeout_stop_func GC_never_stop_func
#else
int GC_timeout_stop_func GC_PROTO((void))
{
CLOCK_TYPE current_time;
static unsigned count = 0;
unsigned long time_diff;
if ((count++ & 3) != 0) return(0);
GET_TIME(current_time);
time_diff = MS_TIME_DIFF(current_time,GC_start_time);
GC_printf1("%lu msecs", (unsigned long)time_diff);
/* Return the minimum number of words that must be allocated between */
/* collections to amortize the collection cost. */
static word min_words_allocd()
{
# ifdef THREADS
/* We punt, for now. */
register signed_word stack_size = 10000;
# else
int dummy;
register signed_word stack_size = (ptr_t)(&dummy) - GC_stackbottom;
# endif
word total_root_size; /* includes double stack size, */
word scan_size; /* Estimate of memory to be scanned */
/* during normal GC. */
if (stack_size < 0) stack_size = -stack_size;
total_root_size = 2 * stack_size + GC_root_size;
scan_size = BYTES_TO_WORDS(GC_heapsize - GC_large_free_bytes
+ (GC_large_free_bytes >> 2)
/* use a bit more of large empty heap */
+ total_root_size);
return scan_size / (2 * GC_free_space_divisor);
return scan_size / GC_free_space_divisor;
}
}
/* Return the number of words allocated, adjusted for explicit storage */
/* management, etc.. This number is used in deciding when to trigger */
/* collections. */
word GC_adj_words_allocd()
{
register signed_word result;
register signed_word expl_managed =
BYTES_TO_WORDS((long)GC_non_gc_bytes
- (long)GC_non_gc_bytes_at_gc);
/* Don't count what was explicitly freed, or newly allocated for */
/* explicit management. Note that deallocating an explicitly */
/* managed object should not alter result, assuming the client */
/* is playing by the rules. */
result = (signed_word)GC_words_allocd
- (signed_word)GC_mem_freed
+ (signed_word)GC_finalizer_mem_freed - expl_managed;
if (result > (signed_word)GC_words_allocd) {
result = GC_words_allocd;
/* probably client bug or unfortunate scheduling */
}
result += GC_words_finalized;
/* We count objects enqueued for finalization as though they */
/* had been reallocated this round. Finalization is user */
/* visible progress. And if we don't count this, we have */
/* stability problems for programs that finalize all objects. */
if ((GC_words_wasted >> 3) < result)
result += GC_words_wasted;
/* This doesn't reflect useful work. But if there is lots of */
/* new fragmentation, the same is probably true of the heap, */
/* and the collection will be correspondingly cheaper. */
if (result < (signed_word)(GC_words_allocd >> 3)) {
/* Always count at least 1/8 of the allocations. We don't want */
/* to collect too infrequently, since that would inhibit */
/* coalescing of free storage blocks. */
/* This also makes us partially robust against client bugs. */
return(GC_words_allocd >> 3);
} else {
return(result);
}
}
/* Clear up a few frames worth of garbage left at the top of the stack. */
/* This is used to prevent us from accidentally treating garbade left */
/* on the stack by other parts of the collector as roots. This */
/* differs from the code in misc.c, which actually tries to keep the */
/* stack clear of long-lived, client-generated garbage. */
void GC_clear_a_few_frames()
{
# define NWORDS 64
word frames[NWORDS];
/* Some compilers will warn that frames was set but never used. */
/* That's the whole idea ... */
register int i;
for (i = 0; i < NWORDS; i++) frames[i] = 0;
}
/* Heap size at which we need a collection to avoid expanding past */
/* limits used by blacklisting. */
static word GC_collect_at_heapsize = (word)(-1);
/* Have we allocated enough to amortize a collection? */
GC_bool GC_should_collect()
{
return(GC_adj_words_allocd() >= min_words_allocd()
|| GC_heapsize >= GC_collect_at_heapsize);
if (GC_start_call_back != (void (*) GC_PROTO((void)))0) {
GC_bool GC_is_full_gc = FALSE;
/*
* Initiate a garbage collection if appropriate.
* Choose judiciously
* between partial, full, and stop-world collections.
* Assumes lock held, signals disabled.
*/
void GC_maybe_gc()
{
static int n_partial_gcs = 0;
if (GC_should_collect()) {
if (!GC_incremental) {
GC_gcollect_inner();
n_partial_gcs = 0;
return;
} else {
# ifdef PARALLEL_MARK
GC_wait_for_reclaim();
# endif
if (GC_need_full_gc || n_partial_gcs >= GC_full_freq) {
# ifdef CONDPRINT
if (GC_print_stats) {
GC_printf2(
"***>Full mark for collection %lu after %ld allocd bytes\n",
(unsigned long) GC_gc_no+1,
(long)WORDS_TO_BYTES(GC_words_allocd));
}
# endif
GC_promote_black_lists();
(void)GC_reclaim_all((GC_stop_func)0, TRUE);
GC_clear_marks();
n_partial_gcs = 0;
GC_notify_full_gc();
/* We try to mark with the world stopped. */
/* If we run out of time, this turns into */
/* incremental marking. */
# ifndef NO_CLOCK
if (GC_time_limit != GC_TIME_UNLIMITED) { GET_TIME(GC_start_time); }
if (GC_stopped_mark(GC_time_limit == GC_TIME_UNLIMITED?
GC_never_stop_func : GC_timeout_stop_func)) {
GC_save_callers(GC_last_stack);
# endif
GC_finish_collection();
} else {
if (!GC_is_full_gc) {
/* Count this as the first attempt */
GC_n_attempts++;
}
}
}
}
/*
* Stop the world garbage collection. Assumes lock held, signals disabled.
* If stop_func is not GC_never_stop_func, then abort if stop_func returns TRUE.
* Return TRUE if we successfully completed the collection.
*/
GC_bool GC_try_to_collect_inner(stop_func)
GC_stop_func stop_func;
{
# ifdef CONDPRINT
CLOCK_TYPE start_time, current_time;
# endif
if (GC_incremental && GC_collection_in_progress()) {
GC_printf0(
"GC_try_to_collect_inner: finishing collection in progress\n");
/* Just finish collection already in progress. */
while(GC_collection_in_progress()) {
if (stop_func()) return(FALSE);
GC_collect_a_little_inner(1);
}
}
GC_printf2(
"Initiating full world-stop collection %lu after %ld allocd bytes\n",
(unsigned long) GC_gc_no+1,
(long)WORDS_TO_BYTES(GC_words_allocd));
# endif
GC_promote_black_lists();
/* Make sure all blocks have been reclaimed, so sweep routines */
/* don't see cleared mark bits. */
/* If we're guaranteed to finish, then this is unnecessary. */
/* In the find_leak case, we have to finish to guarantee that */
/* previously unmarked objects are not reported as leaks. */
# ifdef PARALLEL_MARK
GC_wait_for_reclaim();
# endif
if ((GC_find_leak || stop_func != GC_never_stop_func)
&& !GC_reclaim_all(stop_func, FALSE)) {
/* Aborted. So far everything is still consistent. */
return(FALSE);
}
GC_invalidate_mark_state(); /* Flush mark stack. */
GC_clear_marks();
if (!GC_stopped_mark(stop_func)) {
if (!GC_incremental) {
/* We're partially done and have no way to complete or use */
/* current work. Reestablish invariants as cheaply as */
/* possible. */
GC_invalidate_mark_state();
GC_unpromote_black_lists();
} /* else we claim the world is already still consistent. We'll */
/* finish incrementally. */
return(FALSE);
}
GC_finish_collection();
# if defined(CONDPRINT)
if (GC_print_stats) {
GET_TIME(current_time);
GC_printf1("Complete collection took %lu msecs\n",
MS_TIME_DIFF(current_time,start_time));
}
# endif
return(TRUE);
}
/*
* Perform n units of garbage collection work. A unit is intended to touch
* roughly GC_RATE pages. Every once in a while, we do more than that.
* This needa to be a fairly large number with our current incremental
* GC strategy, since otherwise we allocate too much during GC, and the
* cleanup gets expensive.
# define GC_RATE 10
# define MAX_PRIOR_ATTEMPTS 1
/* Maximum number of prior attempts at world stop marking */
/* A value of 1 means that we finish the second time, no matter */
/* how long it takes. Doesn't count the initial root scan */
/* for a full GC. */
int GC_deficit = 0; /* The number of extra calls to GC_mark_some */
/* that we have made. */
void GC_collect_a_little_inner(n)
int n;
{
register int i;
if (GC_incremental && GC_collection_in_progress()) {
# ifdef PARALLEL_MARK
GC_wait_for_reclaim();
# endif
if (GC_n_attempts < MAX_PRIOR_ATTEMPTS
&& GC_time_limit != GC_TIME_UNLIMITED) {
GET_TIME(GC_start_time);
if (!GC_stopped_mark(GC_timeout_stop_func)) {
GC_n_attempts++;
break;
}
} else {
(void)GC_stopped_mark(GC_never_stop_func);
}
GC_finish_collection();
break;
}
}
if (GC_deficit > 0) GC_deficit -= GC_RATE*n;
if (GC_deficit < 0) GC_deficit = 0;
} else {
GC_maybe_gc();
}
}
int GC_collect_a_little GC_PROTO(())
{
int result;
DCL_LOCK_STATE;
DISABLE_SIGNALS();
LOCK();
GC_collect_a_little_inner(1);
result = (int)GC_collection_in_progress();
UNLOCK();
ENABLE_SIGNALS();
if (!result && GC_debugging_started) GC_print_all_smashed();
return(result);
}
/*
* Assumes lock is held, signals are disabled.
* We stop the world.
* If stop_func() ever returns TRUE, we may fail and return FALSE.
* Increment GC_gc_no if we succeed.
*/
GC_bool GC_stopped_mark(stop_func)
GC_stop_func stop_func;
{
register int i;
# if defined(PRINTTIMES) || defined(CONDPRINT)
# if defined(CONDPRINT) && !defined(PRINTTIMES)
if (GC_print_stats) GET_TIME(start_time);
# endif
# if defined(REGISTER_LIBRARIES_EARLY)
GC_cond_register_dynamic_libraries();
# endif
STOP_WORLD();
IF_THREADS(GC_world_stopped = TRUE);
GC_printf1("--> Marking for collection %lu ",
(unsigned long) GC_gc_no + 1);
GC_printf2("after %lu allocd bytes + %lu wasted bytes\n",
(unsigned long) WORDS_TO_BYTES(GC_words_allocd),
(unsigned long) WORDS_TO_BYTES(GC_words_wasted));
# ifdef MAKE_BACK_GRAPH
if (GC_print_back_height) {
GC_build_back_graph();
}
# endif
/* Mark from all roots. */
/* Minimize junk left in my registers and on the stack */
GC_clear_a_few_frames();
GC_noop(0,0,0,0,0,0);
GC_initiate_gc();
for(i = 0;;i++) {
if ((*stop_func)()) {
GC_printf0("Abandoned stopped marking after ");
GC_printf1("%lu iterations\n",
(unsigned long)i);
if (GC_mark_some((ptr_t)(&dummy))) break;
}
GC_gc_no++;
# ifdef PRINTSTATS
GC_printf2("Collection %lu reclaimed %ld bytes",
(unsigned long) GC_gc_no - 1,
(long)WORDS_TO_BYTES(GC_mem_found));
# else
# ifdef CONDPRINT
if (GC_print_stats) {
GC_printf1("Collection %lu finished", (unsigned long) GC_gc_no - 1);
}
# endif
# endif /* !PRINTSTATS */
# ifdef CONDPRINT
if (GC_print_stats) {
GC_printf1(" ---> heapsize = %lu bytes\n",
(unsigned long) GC_heapsize);
/* Printf arguments may be pushed in funny places. Clear the */
/* space. */
GC_printf0("");
}
# endif /* CONDPRINT */
/* Check all debugged objects for consistency */
if (GC_debugging_started) {
(*GC_check_heap)();
}
# ifdef PRINTTIMES
GET_TIME(current_time);
GC_printf1("World-stopped marking took %lu msecs\n",
MS_TIME_DIFF(current_time,start_time));
# else
# ifdef CONDPRINT
if (GC_print_stats) {
GET_TIME(current_time);
GC_printf1("World-stopped marking took %lu msecs\n",
MS_TIME_DIFF(current_time,start_time));
}
# endif
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
/* Set all mark bits for the free list whose first entry is q */
#ifdef __STDC__
void GC_set_fl_marks(ptr_t q)
#else
void GC_set_fl_marks(q)
ptr_t q;
#endif
{
ptr_t p;
struct hblk * h, * last_h = 0;
hdr *hhdr;
int word_no;
for (p = q; p != 0; p = obj_link(p)){
h = HBLKPTR(p);
if (h != last_h) {
last_h = h;
hhdr = HDR(h);
}
word_no = (((word *)p) - ((word *)h));
set_mark_bit_from_hdr(hhdr, word_no);
}
}
/* Clear all mark bits for the free list whose first entry is q */
/* Decrement GC_mem_found by number of words on free list. */
#ifdef __STDC__
void GC_clear_fl_marks(ptr_t q)
#else
void GC_clear_fl_marks(q)
ptr_t q;
#endif
{
ptr_t p;
struct hblk * h, * last_h = 0;
hdr *hhdr;
int word_no;
for (p = q; p != 0; p = obj_link(p)){
h = HBLKPTR(p);
if (h != last_h) {
last_h = h;
hhdr = HDR(h);
}
word_no = (((word *)p) - ((word *)h));
clear_mark_bit_from_hdr(hhdr, word_no);
# ifdef GATHERSTATS
GC_mem_found -= hhdr -> hb_sz;
# endif
}
}
/* Finish up a collection. Assumes lock is held, signals are disabled, */
/* but the world is otherwise running. */
void GC_finish_collection()
{
# ifdef PRINTTIMES
CLOCK_TYPE start_time;
CLOCK_TYPE finalize_time;
CLOCK_TYPE done_time;
GET_TIME(start_time);
finalize_time = start_time;
# endif
# ifdef GATHERSTATS
GC_mem_found = 0;
# endif
# if defined(LINUX) && defined(__ELF__) && !defined(SMALL_CONFIG)
if (getenv("GC_PRINT_ADDRESS_MAP") != 0) {
GC_print_address_map();
}
/* Mark all objects on the free list. All objects should be */
/* marked when we're done. */
{
register word size; /* current object size */
int kind;
for (kind = 0; kind < GC_n_kinds; kind++) {
for (size = 1; size <= MAXOBJSZ; size++) {
q = GC_obj_kinds[kind].ok_freelist[size];
if (q != 0) GC_set_fl_marks(q);
/* The above just checks; it doesn't really reclaim anything. */
}
GC_finalize();
# ifdef STUBBORN_ALLOC
GC_clean_changing_list();
# endif
# ifdef PRINTTIMES
GET_TIME(finalize_time);
# endif
if (GC_print_back_height) {
# ifdef MAKE_BACK_GRAPH
GC_traverse_back_graph();
# else
# ifndef SMALL_CONFIG
GC_err_printf0("Back height not available: "
"Rebuild collector with -DMAKE_BACK_GRAPH\n");
# endif
# endif
}
/* Clear free list mark bits, in case they got accidentally marked */
/* (or GC_find_leak is set and they were intentionally marked). */
/* Also subtract memory remaining from GC_mem_found count. */
/* Note that composite objects on free list are cleared. */
/* Thus accidentally marking a free list is not a problem; only */
/* objects on the list itself will be marked, and that's fixed here. */
register ptr_t q; /* pointer to current object */
int kind;
for (kind = 0; kind < GC_n_kinds; kind++) {
for (size = 1; size <= MAXOBJSZ; size++) {
q = GC_obj_kinds[kind].ok_freelist[size];
if (q != 0) GC_clear_fl_marks(q);
GC_printf1("Bytes recovered before sweep - f.l. count = %ld\n",
(long)WORDS_TO_BYTES(GC_mem_found));
GC_start_reclaim(FALSE);
if (GC_is_full_gc) {
GC_used_heap_size_after_full = USED_HEAP_SIZE;
GC_need_full_gc = FALSE;
} else {
GC_need_full_gc =
BYTES_TO_WORDS(USED_HEAP_SIZE - GC_used_heap_size_after_full)
> min_words_allocd();
}
"Immediately reclaimed %ld bytes in heap of size %lu bytes",
(long)WORDS_TO_BYTES(GC_mem_found),
(unsigned long)GC_heapsize);
# ifdef USE_MUNMAP
GC_printf1("(%lu unmapped)", GC_unmapped_bytes);
# endif
GC_printf2(
"\n%lu (atomic) + %lu (composite) collectable bytes in use\n",
(unsigned long)WORDS_TO_BYTES(GC_atomic_in_use),
(unsigned long)WORDS_TO_BYTES(GC_composite_in_use));
GC_n_attempts = 0;
GC_is_full_gc = FALSE;
/* Reset or increment counters for next cycle */
GC_words_allocd_before_gc += GC_words_allocd;
GC_non_gc_bytes_at_gc = GC_non_gc_bytes;
GC_words_allocd = 0;
GC_words_wasted = 0;
GC_mem_freed = 0;
# ifdef USE_MUNMAP
GC_unmap_old();
# endif
# ifdef PRINTTIMES
GET_TIME(done_time);
GC_printf2("Finalize + initiate sweep took %lu + %lu msecs\n",
MS_TIME_DIFF(finalize_time,start_time),
MS_TIME_DIFF(done_time,finalize_time));
# endif
}
/* Externally callable routine to invoke full, stop-world collection */
# if defined(__STDC__) || defined(__cplusplus)
int GC_try_to_collect(GC_stop_func stop_func)
# else
int GC_try_to_collect(stop_func)
GC_stop_func stop_func;
# endif
{
int result;
DCL_LOCK_STATE;
GC_INVOKE_FINALIZERS();
DISABLE_SIGNALS();
LOCK();
ENTER_GC();
if (!GC_is_initialized) GC_init_inner();
/* Minimize junk left in my registers */
GC_noop(0,0,0,0,0,0);
result = (int)GC_try_to_collect_inner(stop_func);
EXIT_GC();
UNLOCK();
ENABLE_SIGNALS();
if(result) {
if (GC_debugging_started) GC_print_all_smashed();
GC_INVOKE_FINALIZERS();
}
return(result);
}
void GC_gcollect GC_PROTO(())
{
(void)GC_try_to_collect(GC_never_stop_func);
}
word GC_n_heap_sects = 0; /* Number of sections currently in heap. */
/*
* Use the chunk of memory starting at p of size bytes as part of the heap.
* Assumes p is HBLKSIZE aligned, and bytes is a multiple of HBLKSIZE.
*/
void GC_add_to_heap(p, bytes)
struct hblk *p;
word bytes;
{
word words;
if (GC_n_heap_sects >= MAX_HEAP_SECTS) {
ABORT("Too many heap sections: Increase MAXHINCR or MAX_HEAP_SECTS");
}
phdr = GC_install_header(p);
if (0 == phdr) {
/* This is extremely unlikely. Can't add it. This will */
/* almost certainly result in a 0 return from the allocator, */
/* which is entirely appropriate. */
return;
}
GC_heap_sects[GC_n_heap_sects].hs_start = (ptr_t)p;
GC_heap_sects[GC_n_heap_sects].hs_bytes = bytes;
GC_n_heap_sects++;
phdr -> hb_map = (unsigned char *)1; /* A value != GC_invalid_map */
if ((ptr_t)p <= (ptr_t)GC_least_plausible_heap_addr
GC_least_plausible_heap_addr = (GC_PTR)((ptr_t)p - sizeof(word));
/* Making it a little smaller than necessary prevents */
/* us from getting a false hit from the variable */
/* itself. There's some unintentional reflection */
/* here. */
}
if ((ptr_t)p + bytes >= (ptr_t)GC_greatest_plausible_heap_addr) {
GC_greatest_plausible_heap_addr = (GC_PTR)((ptr_t)p + bytes);
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
}
}
# if !defined(NO_DEBUGGING)
void GC_print_heap_sects()
{
register unsigned i;
GC_printf1("Total heap size: %lu\n", (unsigned long) GC_heapsize);
for (i = 0; i < GC_n_heap_sects; i++) {
unsigned long start = (unsigned long) GC_heap_sects[i].hs_start;
unsigned long len = (unsigned long) GC_heap_sects[i].hs_bytes;
struct hblk *h;
unsigned nbl = 0;
GC_printf3("Section %ld from 0x%lx to 0x%lx ", (unsigned long)i,
start, (unsigned long)(start + len));
for (h = (struct hblk *)start; h < (struct hblk *)(start + len); h++) {
if (GC_is_black_listed(h, HBLKSIZE)) nbl++;
}
GC_printf2("%lu/%lu blacklisted\n", (unsigned long)nbl,
(unsigned long)(len/HBLKSIZE));
}
}
# endif
GC_PTR GC_least_plausible_heap_addr = (GC_PTR)ONES;
GC_PTR GC_greatest_plausible_heap_addr = 0;
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
ptr_t GC_max(x,y)
ptr_t x, y;
{
return(x > y? x : y);
}
ptr_t GC_min(x,y)
ptr_t x, y;
{
return(x < y? x : y);
}
# if defined(__STDC__) || defined(__cplusplus)
void GC_set_max_heap_size(GC_word n)
# else
void GC_set_max_heap_size(n)
GC_word n;
# endif
{
GC_max_heapsize = n;
}
GC_word GC_max_retries = 0;
/*
* this explicitly increases the size of the heap. It is used
* internally, but may also be invoked from GC_expand_hp by the user.
* The argument is in units of HBLKSIZE.
* Tiny values of n are rounded up.
* Returns FALSE on failure.
*/
GC_bool GC_expand_hp_inner(n)
word n;
{
word bytes;
struct hblk * space;
word expansion_slop; /* Number of bytes by which we expect the */
/* heap to expand soon. */
if (n < MINHINCR) n = MINHINCR;
bytes = n * HBLKSIZE;
/* Make sure bytes is a multiple of GC_page_size */
{
word mask = GC_page_size - 1;
bytes += mask;
bytes &= ~mask;
}
if (GC_max_heapsize != 0 && GC_heapsize + bytes > GC_max_heapsize) {
/* Exceeded self-imposed limit */
return(FALSE);
}
space = GET_MEM(bytes);
if( space == 0 ) {
# ifdef CONDPRINT
if (GC_print_stats) {
GC_printf1("Failed to expand heap by %ld bytes\n",
(unsigned long)bytes);
}
# endif
GC_printf2("Increasing heap size by %lu after %lu allocated bytes\n",
(unsigned long)bytes,
(unsigned long)WORDS_TO_BYTES(GC_words_allocd));
# ifdef UNDEFINED
GC_printf1("Root size = %lu\n", GC_root_size);
GC_print_block_list(); GC_print_hblkfreelist();
GC_printf0("\n");
# endif
expansion_slop = WORDS_TO_BYTES(min_words_allocd()) + 4*MAXHINCR*HBLKSIZE;
|| (GC_last_heap_addr != 0 && GC_last_heap_addr < (ptr_t)space)) {
/* Assume the heap is growing up */
GC_greatest_plausible_heap_addr =
(GC_PTR)GC_max((ptr_t)GC_greatest_plausible_heap_addr,
(ptr_t)space + bytes + expansion_slop);
} else {
/* Heap is growing down */
GC_least_plausible_heap_addr =
(GC_PTR)GC_min((ptr_t)GC_least_plausible_heap_addr,
(ptr_t)space - expansion_slop);
# if defined(LARGE_CONFIG)
if (((ptr_t)GC_greatest_plausible_heap_addr <= (ptr_t)space + bytes
|| (ptr_t)GC_least_plausible_heap_addr >= (ptr_t)space)
&& GC_heapsize > 0) {
/* GC_add_to_heap will fix this, but ... */
WARN("Too close to address space limit: blacklisting ineffective\n", 0);
}
# endif
GC_prev_heap_addr = GC_last_heap_addr;
GC_last_heap_addr = (ptr_t)space;
GC_add_to_heap(space, bytes);
/* Force GC before we are likely to allocate past expansion_slop */
GC_collect_at_heapsize =
GC_heapsize + expansion_slop - 2*MAXHINCR*HBLKSIZE;
# if defined(LARGE_CONFIG)
if (GC_collect_at_heapsize < GC_heapsize /* wrapped */)
GC_collect_at_heapsize = (word)(-1);
# endif
return(TRUE);
}
/* Really returns a bool, but it's externally visible, so that's clumsy. */
/* Arguments is in bytes. */
# if defined(__STDC__) || defined(__cplusplus)
int GC_expand_hp(size_t bytes)
# else
int GC_expand_hp(bytes)
size_t bytes;
# endif
{
int result;
DCL_LOCK_STATE;
DISABLE_SIGNALS();
LOCK();
if (!GC_is_initialized) GC_init_inner();
result = (int)GC_expand_hp_inner(divHBLKSZ((word)bytes));