/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
- * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996-1999 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.
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
*/
-/* Boehm, February 15, 1996 2:41 pm PST */
#include <stdio.h>
-#include "gc_priv.h"
+#include "private/gc_priv.h"
signed_word GC_mem_found = 0;
/* Number of words of memory reclaimed */
-# ifdef FIND_LEAK
+#if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
+ word GC_fl_builder_count = 0;
+ /* Number of threads currently building free lists without */
+ /* holding GC lock. It is not safe to collect if this is */
+ /* nonzero. */
+#endif /* PARALLEL_MARK */
+
static void report_leak(p, sz)
ptr_t p;
word sz;
} else {
GC_err_printf0("Leaked composite object at ");
}
- if (GC_debugging_started && GC_has_debug_info(p)) {
- GC_print_obj(p);
- } else {
- GC_err_printf2("0x%lx (appr. size = %ld)\n",
- (unsigned long)p,
- (unsigned long)WORDS_TO_BYTES(sz));
- }
+ GC_print_heap_obj(p);
+ GC_err_printf0("\n");
}
# define FOUND_FREE(hblk, word_no) \
- if (abort_if_found) { \
+ { \
report_leak((ptr_t)hblk + WORDS_TO_BYTES(word_no), \
HDR(hblk) -> hb_sz); \
}
-# else
-# define FOUND_FREE(hblk, word_no)
-# endif
/*
* reclaim phase
GC_bool GC_block_empty(hhdr)
register hdr * hhdr;
{
+ /* We treat hb_marks as an array of words here, even if it is */
+ /* actually an array of bytes. Since we only check for zero, there */
+ /* are no endian-ness issues. */
register word *p = (word *)(&(hhdr -> hb_marks[0]));
register word * plim =
- (word *)(&(hhdr -> hb_marks[MARK_BITS_SZ]));
+ (word *)(&(hhdr -> hb_marks[MARK_BITS_SZ]));
while (p < plim) {
if (*p++) return(FALSE);
}
return(TRUE);
}
-# ifdef GATHERSTATS
+/* The following functions sometimes return a DONT_KNOW value. */
+#define DONT_KNOW 2
+
+#ifdef SMALL_CONFIG
+# define GC_block_nearly_full1(hhdr, pat1) DONT_KNOW
+# define GC_block_nearly_full3(hhdr, pat1, pat2) DONT_KNOW
+# define GC_block_nearly_full(hhdr) DONT_KNOW
+#endif
+
+#if !defined(SMALL_CONFIG) && defined(USE_MARK_BYTES)
+
+# define GC_block_nearly_full1(hhdr, pat1) GC_block_nearly_full(hhdr)
+# define GC_block_nearly_full3(hhdr, pat1, pat2) GC_block_nearly_full(hhdr)
+
+
+GC_bool GC_block_nearly_full(hhdr)
+register hdr * hhdr;
+{
+ /* We again treat hb_marks as an array of words, even though it */
+ /* isn't. We first sum up all the words, resulting in a word */
+ /* containing 4 or 8 separate partial sums. */
+ /* We then sum the bytes in the word of partial sums. */
+ /* This is still endian independant. This fails if the partial */
+ /* sums can overflow. */
+# if (BYTES_TO_WORDS(MARK_BITS_SZ)) >= 256
+ --> potential overflow; fix the code
+# endif
+ register word *p = (word *)(&(hhdr -> hb_marks[0]));
+ register word * plim =
+ (word *)(&(hhdr -> hb_marks[MARK_BITS_SZ]));
+ word sum_vector = 0;
+ unsigned sum;
+ while (p < plim) {
+ sum_vector += *p;
+ ++p;
+ }
+ sum = 0;
+ while (sum_vector > 0) {
+ sum += sum_vector & 0xff;
+ sum_vector >>= 8;
+ }
+ return (sum > BYTES_TO_WORDS(7*HBLKSIZE/8)/(hhdr -> hb_sz));
+}
+#endif /* USE_MARK_BYTES */
+
+#if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
+
+/*
+ * Test whether nearly all of the mark words consist of the same
+ * repeating pattern.
+ */
+#define FULL_THRESHOLD (MARK_BITS_SZ/16)
+
+GC_bool GC_block_nearly_full1(hhdr, pat1)
+hdr *hhdr;
+word pat1;
+{
+ unsigned i;
+ unsigned misses = 0;
+ GC_ASSERT((MARK_BITS_SZ & 1) == 0);
+ for (i = 0; i < MARK_BITS_SZ; ++i) {
+ if ((hhdr -> hb_marks[i] | ~pat1) != ONES) {
+ if (++misses > FULL_THRESHOLD) return FALSE;
+ }
+ }
+ return TRUE;
+}
+
+/*
+ * Test whether the same repeating 3 word pattern occurs in nearly
+ * all the mark bit slots.
+ * This is used as a heuristic, so we're a bit sloppy and ignore
+ * the last one or two words.
+ */
+GC_bool GC_block_nearly_full3(hhdr, pat1, pat2, pat3)
+hdr *hhdr;
+word pat1, pat2, pat3;
+{
+ unsigned i;
+ unsigned misses = 0;
+
+ if (MARK_BITS_SZ < 4) {
+ return DONT_KNOW;
+ }
+ for (i = 0; i < MARK_BITS_SZ - 2; i += 3) {
+ if ((hhdr -> hb_marks[i] | ~pat1) != ONES) {
+ if (++misses > FULL_THRESHOLD) return FALSE;
+ }
+ if ((hhdr -> hb_marks[i+1] | ~pat2) != ONES) {
+ if (++misses > FULL_THRESHOLD) return FALSE;
+ }
+ if ((hhdr -> hb_marks[i+2] | ~pat3) != ONES) {
+ if (++misses > FULL_THRESHOLD) return FALSE;
+ }
+ }
+ return TRUE;
+}
+
+/* Check whether a small object block is nearly full by looking at only */
+/* the mark bits. */
+/* We manually precomputed the mark bit patterns that need to be */
+/* checked for, and we give up on the ones that are unlikely to occur, */
+/* or have period > 3. */
+/* This would be a lot easier with a mark bit per object instead of per */
+/* word, but that would rewuire computing object numbers in the mark */
+/* loop, which would require different data structures ... */
+GC_bool GC_block_nearly_full(hhdr)
+hdr *hhdr;
+{
+ int sz = hhdr -> hb_sz;
+
+# if CPP_WORDSZ != 32 && CPP_WORDSZ != 64
+ return DONT_KNOW; /* Shouldn't be used in any standard config. */
+# endif
+# if CPP_WORDSZ == 32
+ switch(sz) {
+ case 1:
+ return GC_block_nearly_full1(hhdr, 0xffffffffl);
+ case 2:
+ return GC_block_nearly_full1(hhdr, 0x55555555l);
+ case 4:
+ return GC_block_nearly_full1(hhdr, 0x11111111l);
+ case 6:
+ return GC_block_nearly_full3(hhdr, 0x41041041l,
+ 0x10410410l,
+ 0x04104104l);
+ case 8:
+ return GC_block_nearly_full1(hhdr, 0x01010101l);
+ case 12:
+ return GC_block_nearly_full3(hhdr, 0x01001001l,
+ 0x10010010l,
+ 0x00100100l);
+ case 16:
+ return GC_block_nearly_full1(hhdr, 0x00010001l);
+ case 32:
+ return GC_block_nearly_full1(hhdr, 0x00000001l);
+ default:
+ return DONT_KNOW;
+ }
+# endif
+# if CPP_WORDSZ == 64
+ switch(sz) {
+ case 1:
+ return GC_block_nearly_full1(hhdr, 0xffffffffffffffffl);
+ case 2:
+ return GC_block_nearly_full1(hhdr, 0x5555555555555555l);
+ case 4:
+ return GC_block_nearly_full1(hhdr, 0x1111111111111111l);
+ case 6:
+ return GC_block_nearly_full3(hhdr, 0x1041041041041041l,
+ 0x4104104104104104l,
+ 0x0410410410410410l);
+ case 8:
+ return GC_block_nearly_full1(hhdr, 0x0101010101010101l);
+ case 12:
+ return GC_block_nearly_full3(hhdr, 0x1001001001001001l,
+ 0x0100100100100100l,
+ 0x0010010010010010l);
+ case 16:
+ return GC_block_nearly_full1(hhdr, 0x0001000100010001l);
+ case 32:
+ return GC_block_nearly_full1(hhdr, 0x0000000100000001l);
+ default:
+ return DONT_KNOW;
+ }
+# endif
+}
+#endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
+
+/* We keep track of reclaimed memory if we are either asked to, or */
+/* we are using the parallel marker. In the latter case, we assume */
+/* that most allocation goes through GC_malloc_many for scalability. */
+/* GC_malloc_many needs the count anyway. */
+# if defined(GATHERSTATS) || defined(PARALLEL_MARK)
# define INCR_WORDS(sz) n_words_found += (sz)
+# define COUNT_PARAM , count
+# define COUNT_ARG , count
+# define COUNT_DECL signed_word * count;
+# define NWORDS_DECL signed_word n_words_found = 0;
+# define COUNT_UPDATE *count += n_words_found;
+# define MEM_FOUND_ADDR , &GC_mem_found
# else
# define INCR_WORDS(sz)
+# define COUNT_PARAM
+# define COUNT_ARG
+# define COUNT_DECL
+# define NWORDS_DECL
+# define COUNT_UPDATE
+# define MEM_FOUND_ADDR
# endif
/*
* Restore unmarked small objects in h of size sz to the object
* Clears unmarked objects.
*/
/*ARGSUSED*/
-ptr_t GC_reclaim_clear(hbp, hhdr, sz, list, abort_if_found)
+ptr_t GC_reclaim_clear(hbp, hhdr, sz, list COUNT_PARAM)
register struct hblk *hbp; /* ptr to current heap block */
register hdr * hhdr;
-GC_bool abort_if_found; /* Abort if a reclaimable object is found */
register ptr_t list;
register word sz;
+COUNT_DECL
{
register int word_no;
register word *p, *q, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
+ NWORDS_DECL
+ GC_ASSERT(hhdr == GC_find_header((ptr_t)hbp));
p = (word *)(hbp->hb_body);
- word_no = HDR_WORDS;
+ word_no = 0;
plim = (word *)((((word)hbp) + HBLKSIZE)
- WORDS_TO_BYTES(sz));
if( mark_bit_from_hdr(hhdr, word_no) ) {
p += sz;
} else {
- FOUND_FREE(hbp, word_no);
INCR_WORDS(sz);
/* object is available - put on list */
obj_link(p) = list;
list = ((ptr_t)p);
/* Clear object, advance p to next object in the process */
q = p + sz;
- p++; /* Skip link field */
- while (p < q) {
+# ifdef USE_MARK_BYTES
+ GC_ASSERT(!(sz & 1)
+ && !((word)p & (2 * sizeof(word) - 1)));
+ p[1] = 0;
+ p += 2;
+ while (p < q) {
+ CLEAR_DOUBLE(p);
+ p += 2;
+ }
+# else
+ p++; /* Skip link field */
+ while (p < q) {
*p++ = 0;
- }
+ }
+# endif
}
word_no += sz;
}
-# ifdef GATHERSTATS
- GC_mem_found += n_words_found;
-# endif
+ COUNT_UPDATE
return(list);
}
-#ifndef SMALL_CONFIG
+#if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
/*
* A special case for 2 word composite objects (e.g. cons cells):
*/
/*ARGSUSED*/
-ptr_t GC_reclaim_clear2(hbp, hhdr, list, abort_if_found)
+ptr_t GC_reclaim_clear2(hbp, hhdr, list COUNT_PARAM)
register struct hblk *hbp; /* ptr to current heap block */
hdr * hhdr;
-GC_bool abort_if_found; /* Abort if a reclaimable object is found */
register ptr_t list;
+COUNT_DECL
{
- register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word * mark_word_addr = &(hhdr->hb_marks[0]);
register word *p, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
register word mark_word;
register int i;
+ NWORDS_DECL
# define DO_OBJ(start_displ) \
if (!(mark_word & ((word)1 << start_displ))) { \
- FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
p[start_displ] = (word)list; \
list = (ptr_t)(p+start_displ); \
p[start_displ+1] = 0; \
mark_word >>= 8;
}
}
-# ifdef GATHERSTATS
- GC_mem_found += n_words_found;
-# endif
+ COUNT_UPDATE
return(list);
# undef DO_OBJ
}
* Another special case for 4 word composite objects:
*/
/*ARGSUSED*/
-ptr_t GC_reclaim_clear4(hbp, hhdr, list, abort_if_found)
+ptr_t GC_reclaim_clear4(hbp, hhdr, list COUNT_PARAM)
register struct hblk *hbp; /* ptr to current heap block */
hdr * hhdr;
-GC_bool abort_if_found; /* Abort if a reclaimable object is found */
register ptr_t list;
+COUNT_DECL
{
- register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word * mark_word_addr = &(hhdr->hb_marks[0]);
register word *p, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
register word mark_word;
+ NWORDS_DECL
# define DO_OBJ(start_displ) \
if (!(mark_word & ((word)1 << start_displ))) { \
- FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
p[start_displ] = (word)list; \
list = (ptr_t)(p+start_displ); \
p[start_displ+1] = 0; \
- p[start_displ+2] = 0; \
- p[start_displ+3] = 0; \
+ CLEAR_DOUBLE(p + start_displ + 2); \
INCR_WORDS(4); \
}
# endif
p += WORDSZ;
}
-# ifdef GATHERSTATS
- GC_mem_found += n_words_found;
-# endif
+ COUNT_UPDATE
return(list);
# undef DO_OBJ
}
-#endif /* !SMALL_CONFIG */
+#endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
/* The same thing, but don't clear objects: */
/*ARGSUSED*/
-ptr_t GC_reclaim_uninit(hbp, hhdr, sz, list, abort_if_found)
+ptr_t GC_reclaim_uninit(hbp, hhdr, sz, list COUNT_PARAM)
register struct hblk *hbp; /* ptr to current heap block */
register hdr * hhdr;
-GC_bool abort_if_found; /* Abort if a reclaimable object is found */
register ptr_t list;
register word sz;
+COUNT_DECL
{
- register int word_no;
+ register int word_no = 0;
register word *p, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
+ NWORDS_DECL
p = (word *)(hbp->hb_body);
- word_no = HDR_WORDS;
plim = (word *)((((word)hbp) + HBLKSIZE)
- WORDS_TO_BYTES(sz));
/* go through all words in block */
while( p <= plim ) {
if( !mark_bit_from_hdr(hhdr, word_no) ) {
- FOUND_FREE(hbp, word_no);
INCR_WORDS(sz);
/* object is available - put on list */
obj_link(p) = list;
p += sz;
word_no += sz;
}
+ COUNT_UPDATE
+ return(list);
+}
+
+/* Don't really reclaim objects, just check for unmarked ones: */
+/*ARGSUSED*/
+void GC_reclaim_check(hbp, hhdr, sz)
+register struct hblk *hbp; /* ptr to current heap block */
+register hdr * hhdr;
+register word sz;
+{
+ register int word_no = 0;
+ register word *p, *plim;
# ifdef GATHERSTATS
- GC_mem_found += n_words_found;
+ register int n_words_found = 0;
# endif
- return(list);
+
+ p = (word *)(hbp->hb_body);
+ plim = (word *)((((word)hbp) + HBLKSIZE)
+ - WORDS_TO_BYTES(sz));
+
+ /* go through all words in block */
+ while( p <= plim ) {
+ if( !mark_bit_from_hdr(hhdr, word_no) ) {
+ FOUND_FREE(hbp, word_no);
+ }
+ p += sz;
+ word_no += sz;
+ }
}
-#ifndef SMALL_CONFIG
+#if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
/*
* Another special case for 2 word atomic objects:
*/
/*ARGSUSED*/
-ptr_t GC_reclaim_uninit2(hbp, hhdr, list, abort_if_found)
+ptr_t GC_reclaim_uninit2(hbp, hhdr, list COUNT_PARAM)
register struct hblk *hbp; /* ptr to current heap block */
hdr * hhdr;
-GC_bool abort_if_found; /* Abort if a reclaimable object is found */
register ptr_t list;
+COUNT_DECL
{
- register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word * mark_word_addr = &(hhdr->hb_marks[0]);
register word *p, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
register word mark_word;
register int i;
+ NWORDS_DECL
# define DO_OBJ(start_displ) \
if (!(mark_word & ((word)1 << start_displ))) { \
- FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
p[start_displ] = (word)list; \
list = (ptr_t)(p+start_displ); \
INCR_WORDS(2); \
mark_word >>= 8;
}
}
-# ifdef GATHERSTATS
- GC_mem_found += n_words_found;
-# endif
+ COUNT_UPDATE
return(list);
# undef DO_OBJ
}
* Another special case for 4 word atomic objects:
*/
/*ARGSUSED*/
-ptr_t GC_reclaim_uninit4(hbp, hhdr, list, abort_if_found)
+ptr_t GC_reclaim_uninit4(hbp, hhdr, list COUNT_PARAM)
register struct hblk *hbp; /* ptr to current heap block */
hdr * hhdr;
-GC_bool abort_if_found; /* Abort if a reclaimable object is found */
register ptr_t list;
+COUNT_DECL
{
- register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word * mark_word_addr = &(hhdr->hb_marks[0]);
register word *p, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
register word mark_word;
+ NWORDS_DECL
# define DO_OBJ(start_displ) \
if (!(mark_word & ((word)1 << start_displ))) { \
- FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
p[start_displ] = (word)list; \
list = (ptr_t)(p+start_displ); \
INCR_WORDS(4); \
# endif
p += WORDSZ;
}
-# ifdef GATHERSTATS
- GC_mem_found += n_words_found;
-# endif
+ COUNT_UPDATE
return(list);
# undef DO_OBJ
}
/* Finally the one word case, which never requires any clearing: */
/*ARGSUSED*/
-ptr_t GC_reclaim1(hbp, hhdr, list, abort_if_found)
+ptr_t GC_reclaim1(hbp, hhdr, list COUNT_PARAM)
register struct hblk *hbp; /* ptr to current heap block */
hdr * hhdr;
-GC_bool abort_if_found; /* Abort if a reclaimable object is found */
register ptr_t list;
+COUNT_DECL
{
- register word * mark_word_addr = &(hhdr->hb_marks[divWORDSZ(HDR_WORDS)]);
+ register word * mark_word_addr = &(hhdr->hb_marks[0]);
register word *p, *plim;
-# ifdef GATHERSTATS
- register int n_words_found = 0;
-# endif
register word mark_word;
register int i;
+ NWORDS_DECL
# define DO_OBJ(start_displ) \
if (!(mark_word & ((word)1 << start_displ))) { \
- FOUND_FREE(hbp, p - (word *)hbp + start_displ); \
p[start_displ] = (word)list; \
list = (ptr_t)(p+start_displ); \
INCR_WORDS(1); \
mark_word >>= 4;
}
}
-# ifdef GATHERSTATS
- GC_mem_found += n_words_found;
-# endif
+ COUNT_UPDATE
return(list);
# undef DO_OBJ
}
-#endif /* !SMALL_CONFIG */
+#endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
/*
- * Restore unmarked small objects in the block pointed to by hbp
- * to the appropriate object free list.
- * If entirely empty blocks are to be completely deallocated, then
- * caller should perform that check.
+ * Generic procedure to rebuild a free list in hbp.
+ * Also called directly from GC_malloc_many.
*/
-void GC_reclaim_small_nonempty_block(hbp, abort_if_found)
-register struct hblk *hbp; /* ptr to current heap block */
-int abort_if_found; /* Abort if a reclaimable object is found */
+ptr_t GC_reclaim_generic(hbp, hhdr, sz, init, list COUNT_PARAM)
+struct hblk *hbp; /* ptr to current heap block */
+hdr * hhdr;
+GC_bool init;
+ptr_t list;
+word sz;
+COUNT_DECL
{
- hdr * hhdr;
- register word sz; /* size of objects in current block */
- register struct obj_kind * ok;
- register ptr_t * flh;
- register int kind;
-
- hhdr = HDR(hbp);
- sz = hhdr -> hb_sz;
- hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
- kind = hhdr -> hb_obj_kind;
- ok = &GC_obj_kinds[kind];
- flh = &(ok -> ok_freelist[sz]);
- GC_write_hint(hbp);
+ ptr_t result = list;
- if (ok -> ok_init) {
+ GC_ASSERT(GC_find_header((ptr_t)hbp) == hhdr);
+ GC_remove_protection(hbp, 1, (hhdr)->hb_descr == 0 /* Pointer-free? */);
+ if (init) {
switch(sz) {
-# ifndef SMALL_CONFIG
+# if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
case 1:
- *flh = GC_reclaim1(hbp, hhdr, *flh, abort_if_found);
+ /* We now issue the hint even if GC_nearly_full returned */
+ /* DONT_KNOW. */
+ result = GC_reclaim1(hbp, hhdr, list COUNT_ARG);
break;
case 2:
- *flh = GC_reclaim_clear2(hbp, hhdr, *flh, abort_if_found);
+ result = GC_reclaim_clear2(hbp, hhdr, list COUNT_ARG);
break;
case 4:
- *flh = GC_reclaim_clear4(hbp, hhdr, *flh, abort_if_found);
+ result = GC_reclaim_clear4(hbp, hhdr, list COUNT_ARG);
break;
-# endif
+# endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
default:
- *flh = GC_reclaim_clear(hbp, hhdr, sz, *flh, abort_if_found);
+ result = GC_reclaim_clear(hbp, hhdr, sz, list COUNT_ARG);
break;
}
} else {
+ GC_ASSERT((hhdr)->hb_descr == 0 /* Pointer-free block */);
switch(sz) {
-# ifndef SMALL_CONFIG
+# if !defined(SMALL_CONFIG) && !defined(USE_MARK_BYTES)
case 1:
- *flh = GC_reclaim1(hbp, hhdr, *flh, abort_if_found);
+ result = GC_reclaim1(hbp, hhdr, list COUNT_ARG);
break;
case 2:
- *flh = GC_reclaim_uninit2(hbp, hhdr, *flh, abort_if_found);
+ result = GC_reclaim_uninit2(hbp, hhdr, list COUNT_ARG);
break;
case 4:
- *flh = GC_reclaim_uninit4(hbp, hhdr, *flh, abort_if_found);
+ result = GC_reclaim_uninit4(hbp, hhdr, list COUNT_ARG);
break;
-# endif
+# endif /* !SMALL_CONFIG && !USE_MARK_BYTES */
default:
- *flh = GC_reclaim_uninit(hbp, hhdr, sz, *flh, abort_if_found);
+ result = GC_reclaim_uninit(hbp, hhdr, sz, list COUNT_ARG);
break;
}
}
- if (IS_UNCOLLECTABLE(kind)) GC_set_hdr_marks(hhdr);
+ if (IS_UNCOLLECTABLE(hhdr -> hb_obj_kind)) GC_set_hdr_marks(hhdr);
+ return result;
+}
+
+/*
+ * Restore unmarked small objects in the block pointed to by hbp
+ * to the appropriate object free list.
+ * If entirely empty blocks are to be completely deallocated, then
+ * caller should perform that check.
+ */
+void GC_reclaim_small_nonempty_block(hbp, report_if_found COUNT_PARAM)
+register struct hblk *hbp; /* ptr to current heap block */
+int report_if_found; /* Abort if a reclaimable object is found */
+COUNT_DECL
+{
+ hdr *hhdr = HDR(hbp);
+ word sz = hhdr -> hb_sz;
+ int kind = hhdr -> hb_obj_kind;
+ struct obj_kind * ok = &GC_obj_kinds[kind];
+ ptr_t * flh = &(ok -> ok_freelist[sz]);
+
+ hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
+
+ if (report_if_found) {
+ GC_reclaim_check(hbp, hhdr, sz);
+ } else {
+ *flh = GC_reclaim_generic(hbp, hhdr, sz,
+ (ok -> ok_init || GC_debugging_started),
+ *flh MEM_FOUND_ADDR);
+ }
}
/*
* to the heap block free list.
* Otherwise enqueue the block for later processing
* by GC_reclaim_small_nonempty_block.
- * If abort_if_found is TRUE, then process any block immediately.
+ * If report_if_found is TRUE, then process any block immediately, and
+ * simply report free objects; do not actually reclaim them.
*/
-void GC_reclaim_block(hbp, abort_if_found)
-register struct hblk *hbp; /* ptr to current heap block */
-word abort_if_found; /* Abort if a reclaimable object is found */
+# if defined(__STDC__) || defined(__cplusplus)
+ void GC_reclaim_block(register struct hblk *hbp, word report_if_found)
+# else
+ void GC_reclaim_block(hbp, report_if_found)
+ register struct hblk *hbp; /* ptr to current heap block */
+ word report_if_found; /* Abort if a reclaimable object is found */
+# endif
{
register hdr * hhdr;
register word sz; /* size of objects in current block */
ok = &GC_obj_kinds[hhdr -> hb_obj_kind];
if( sz > MAXOBJSZ ) { /* 1 big object */
- if( !mark_bit_from_hdr(hhdr, HDR_WORDS) ) {
- FOUND_FREE(hbp, HDR_WORDS);
-# ifdef GATHERSTATS
+ if( !mark_bit_from_hdr(hhdr, 0) ) {
+ if (report_if_found) {
+ FOUND_FREE(hbp, 0);
+ } else {
+ word blocks = OBJ_SZ_TO_BLOCKS(sz);
+ if (blocks > 1) {
+ GC_large_allocd_bytes -= blocks * HBLKSIZE;
+ }
+# ifdef GATHERSTATS
GC_mem_found += sz;
-# endif
- GC_freehblk(hbp);
+# endif
+ GC_freehblk(hbp);
+ }
}
} else {
GC_bool empty = GC_block_empty(hhdr);
- if (abort_if_found) {
- GC_reclaim_small_nonempty_block(hbp, (int)abort_if_found);
+ if (report_if_found) {
+ GC_reclaim_small_nonempty_block(hbp, (int)report_if_found
+ MEM_FOUND_ADDR);
} else if (empty) {
# ifdef GATHERSTATS
GC_mem_found += BYTES_TO_WORDS(HBLKSIZE);
# endif
GC_freehblk(hbp);
- } else {
+ } else if (TRUE != GC_block_nearly_full(hhdr)){
/* group of smaller objects, enqueue the real work */
rlh = &(ok -> ok_reclaim_list[sz]);
hhdr -> hb_next = *rlh;
*rlh = hbp;
- }
+ } /* else not worth salvaging. */
+ /* We used to do the nearly_full check later, but we */
+ /* already have the right cache context here. Also */
+ /* doing it here avoids some silly lock contention in */
+ /* GC_malloc_many. */
}
}
/* Routines to gather and print heap block info */
/* intended for debugging. Otherwise should be called */
/* with lock. */
-static size_t number_of_blocks;
-static size_t total_bytes;
+
+struct Print_stats
+{
+ size_t number_of_blocks;
+ size_t total_bytes;
+};
+
+#ifdef USE_MARK_BYTES
+
+/* Return the number of set mark bits in the given header */
+int GC_n_set_marks(hhdr)
+hdr * hhdr;
+{
+ register int result = 0;
+ register int i;
+
+ for (i = 0; i < MARK_BITS_SZ; i++) {
+ result += hhdr -> hb_marks[i];
+ }
+ return(result);
+}
+
+#else
/* Number of set bits in a word. Not performance critical. */
static int set_bits(n)
return(result);
}
+#endif /* !USE_MARK_BYTES */
+
/*ARGSUSED*/
-void GC_print_block_descr(h, dummy)
-struct hblk *h;
-word dummy;
+# if defined(__STDC__) || defined(__cplusplus)
+ void GC_print_block_descr(struct hblk *h, word dummy)
+# else
+ void GC_print_block_descr(h, dummy)
+ struct hblk *h;
+ word dummy;
+# endif
{
register hdr * hhdr = HDR(h);
register size_t bytes = WORDS_TO_BYTES(hhdr -> hb_sz);
+ struct Print_stats *ps;
GC_printf3("(%lu:%lu,%lu)", (unsigned long)(hhdr -> hb_obj_kind),
(unsigned long)bytes,
(unsigned long)(GC_n_set_marks(hhdr)));
- bytes += HDR_BYTES + HBLKSIZE-1;
+ bytes += HBLKSIZE-1;
bytes &= ~(HBLKSIZE-1);
- total_bytes += bytes;
- number_of_blocks++;
+
+ ps = (struct Print_stats *)dummy;
+ ps->total_bytes += bytes;
+ ps->number_of_blocks++;
}
void GC_print_block_list()
{
+ struct Print_stats pstats;
+
GC_printf0("(kind(0=ptrfree,1=normal,2=unc.,3=stubborn):size_in_bytes, #_marks_set)\n");
- number_of_blocks = 0;
- total_bytes = 0;
- GC_apply_to_all_blocks(GC_print_block_descr, (word)0);
+ pstats.number_of_blocks = 0;
+ pstats.total_bytes = 0;
+ GC_apply_to_all_blocks(GC_print_block_descr, (word)&pstats);
GC_printf2("\nblocks = %lu, bytes = %lu\n",
- (unsigned long)number_of_blocks,
- (unsigned long)total_bytes);
+ (unsigned long)pstats.number_of_blocks,
+ (unsigned long)pstats.total_bytes);
}
#endif /* NO_DEBUGGING */
/*
- * Do the same thing on the entire heap, after first clearing small object
- * free lists (if we are not just looking for leaks).
+ * Clear all obj_link pointers in the list of free objects *flp.
+ * Clear *flp.
+ * This must be done before dropping a list of free gcj-style objects,
+ * since may otherwise end up with dangling "descriptor" pointers.
+ * It may help for other pointer-containg objects.
*/
-void GC_start_reclaim(abort_if_found)
-int abort_if_found; /* Abort if a GC_reclaimable object is found */
+void GC_clear_fl_links(flp)
+ptr_t *flp;
+{
+ ptr_t next = *flp;
+
+ while (0 != next) {
+ *flp = 0;
+ flp = &(obj_link(next));
+ next = *flp;
+ }
+}
+
+/*
+ * Perform GC_reclaim_block on the entire heap, after first clearing
+ * small object free lists (if we are not just looking for leaks).
+ */
+void GC_start_reclaim(report_if_found)
+int report_if_found; /* Abort if a GC_reclaimable object is found */
{
int kind;
+# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
+ GC_ASSERT(0 == GC_fl_builder_count);
+# endif
/* Clear reclaim- and free-lists */
for (kind = 0; kind < GC_n_kinds; kind++) {
- register ptr_t *fop;
- register ptr_t *lim;
- register struct hblk ** rlp;
- register struct hblk ** rlim;
- register struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
+ ptr_t *fop;
+ ptr_t *lim;
+ struct hblk ** rlp;
+ struct hblk ** rlim;
+ struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
+ GC_bool should_clobber = (GC_obj_kinds[kind].ok_descriptor != 0);
if (rlist == 0) continue; /* This kind not used. */
- if (!abort_if_found) {
+ if (!report_if_found) {
lim = &(GC_obj_kinds[kind].ok_freelist[MAXOBJSZ+1]);
for( fop = GC_obj_kinds[kind].ok_freelist; fop < lim; fop++ ) {
- *fop = 0;
+ if (*fop != 0) {
+ if (should_clobber) {
+ GC_clear_fl_links(fop);
+ } else {
+ *fop = 0;
+ }
+ }
}
} /* otherwise free list objects are marked, */
/* and its safe to leave them */
/* Go through all heap blocks (in hblklist) and reclaim unmarked objects */
/* or enqueue the block for later processing. */
- GC_apply_to_all_blocks(GC_reclaim_block, (word)abort_if_found);
+ GC_apply_to_all_blocks(GC_reclaim_block, (word)report_if_found);
+
+# ifdef EAGER_SWEEP
+ /* This is a very stupid thing to do. We make it possible anyway, */
+ /* so that you can convince yourself that it really is very stupid. */
+ GC_reclaim_all((GC_stop_func)0, FALSE);
+# endif
+# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
+ GC_ASSERT(0 == GC_fl_builder_count);
+# endif
}
while ((hbp = *rlh) != 0) {
hhdr = HDR(hbp);
*rlh = hhdr -> hb_next;
- GC_reclaim_small_nonempty_block(hbp, FALSE);
+ GC_reclaim_small_nonempty_block(hbp, FALSE MEM_FOUND_ADDR);
if (*flh != 0) break;
}
}
* Abort and return FALSE when/if (*stop_func)() returns TRUE.
* If this returns TRUE, then it's safe to restart the world
* with incorrectly cleared mark bits.
- * If ignore_old is TRUE, then reclain only blocks that have been
+ * If ignore_old is TRUE, then reclaim only blocks that have been
* recently reclaimed, and discard the rest.
* Stop_func may be 0.
*/
/* It's likely we'll need it this time, too */
/* It's been touched recently, so this */
/* shouldn't trigger paging. */
- GC_reclaim_small_nonempty_block(hbp, FALSE);
+ GC_reclaim_small_nonempty_block(hbp, FALSE MEM_FOUND_ADDR);
}
}
}
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