#include <stdio.h>
#include "private/gc_priv.h"
GC_bool GC_use_entire_heap = 0;
# define MAX_BLACK_LIST_ALLOC (2*HBLKSIZE)
# define UNIQUE_THRESHOLD 32
# define HUGE_THRESHOLD 256
# define FL_COMPRESSION 8
# define N_HBLK_FLS (HUGE_THRESHOLD - UNIQUE_THRESHOLD)/FL_COMPRESSION \
+ UNIQUE_THRESHOLD
struct hblk * GC_hblkfreelist[N_HBLK_FLS+1] = { 0 };
#ifndef USE_MUNMAP
word GC_free_bytes[N_HBLK_FLS+1] = { 0 };
GC_bool GC_enough_large_bytes_left(bytes,n)
word bytes;
int n;
{
int i;
for (i = N_HBLK_FLS; i >= n; --i) {
bytes += GC_free_bytes[i];
if (bytes > GC_max_large_allocd_bytes) return TRUE;
}
return FALSE;
}
# define INCR_FREE_BYTES(n, b) GC_free_bytes[n] += (b);
# define FREE_ASSERT(e) GC_ASSERT(e)
#else
# define INCR_FREE_BYTES(n, b)
# define FREE_ASSERT(e)
#endif
int GC_hblk_fl_from_blocks(blocks_needed)
word blocks_needed;
{
if (blocks_needed <= UNIQUE_THRESHOLD) return blocks_needed;
if (blocks_needed >= HUGE_THRESHOLD) return N_HBLK_FLS;
return (blocks_needed - UNIQUE_THRESHOLD)/FL_COMPRESSION
+ UNIQUE_THRESHOLD;
}
# define PHDR(hhdr) HDR(hhdr -> hb_prev)
# define NHDR(hhdr) HDR(hhdr -> hb_next)
# ifdef USE_MUNMAP
# define IS_MAPPED(hhdr) (((hhdr) -> hb_flags & WAS_UNMAPPED) == 0)
# else
# define IS_MAPPED(hhdr) 1
# endif
# if !defined(NO_DEBUGGING)
void GC_print_hblkfreelist()
{
struct hblk * h;
word total_free = 0;
hdr * hhdr;
word sz;
int i;
for (i = 0; i <= N_HBLK_FLS; ++i) {
h = GC_hblkfreelist[i];
# ifdef USE_MUNMAP
if (0 != h) GC_printf1("Free list %ld (Total size %ld):\n",
(unsigned long)i);
# else
if (0 != h) GC_printf2("Free list %ld (Total size %ld):\n",
(unsigned long)i,
(unsigned long)GC_free_bytes[i]);
# endif
while (h != 0) {
hhdr = HDR(h);
sz = hhdr -> hb_sz;
GC_printf2("\t0x%lx size %lu ", (unsigned long)h, (unsigned long)sz);
total_free += sz;
if (GC_is_black_listed(h, HBLKSIZE) != 0) {
GC_printf0("start black listed\n");
} else if (GC_is_black_listed(h, hhdr -> hb_sz) != 0) {
GC_printf0("partially black listed\n");
} else {
GC_printf0("not black listed\n");
}
h = hhdr -> hb_next;
}
}
if (total_free != GC_large_free_bytes) {
GC_printf1("GC_large_free_bytes = %lu (INCONSISTENT!!)\n",
(unsigned long) GC_large_free_bytes);
}
GC_printf1("Total of %lu bytes on free list\n", (unsigned long)total_free);
}
int free_list_index_of(wanted)
hdr * wanted;
{
struct hblk * h;
hdr * hhdr;
int i;
for (i = 0; i <= N_HBLK_FLS; ++i) {
h = GC_hblkfreelist[i];
while (h != 0) {
hhdr = HDR(h);
if (hhdr == wanted) return i;
h = hhdr -> hb_next;
}
}
return -1;
}
void GC_dump_regions()
{
unsigned i;
ptr_t start, end;
ptr_t p;
size_t bytes;
hdr *hhdr;
for (i = 0; i < GC_n_heap_sects; ++i) {
start = GC_heap_sects[i].hs_start;
bytes = GC_heap_sects[i].hs_bytes;
end = start + bytes;
while (i+1 < GC_n_heap_sects && GC_heap_sects[i+1].hs_start == end) {
++i;
end = GC_heap_sects[i].hs_start + GC_heap_sects[i].hs_bytes;
}
GC_printf2("***Section from 0x%lx to 0x%lx\n", start, end);
for (p = start; p < end;) {
hhdr = HDR(p);
GC_printf1("\t0x%lx ", (unsigned long)p);
if (IS_FORWARDING_ADDR_OR_NIL(hhdr)) {
GC_printf1("Missing header!!\n", hhdr);
p += HBLKSIZE;
continue;
}
if (HBLK_IS_FREE(hhdr)) {
int correct_index = GC_hblk_fl_from_blocks(
divHBLKSZ(hhdr -> hb_sz));
int actual_index;
GC_printf1("\tfree block of size 0x%lx bytes",
(unsigned long)(hhdr -> hb_sz));
if (IS_MAPPED(hhdr)) {
GC_printf0("\n");
} else {
GC_printf0("(unmapped)\n");
}
actual_index = free_list_index_of(hhdr);
if (-1 == actual_index) {
GC_printf1("\t\tBlock not on free list %ld!!\n",
correct_index);
} else if (correct_index != actual_index) {
GC_printf2("\t\tBlock on list %ld, should be on %ld!!\n",
actual_index, correct_index);
}
p += hhdr -> hb_sz;
} else {
GC_printf1("\tused for blocks of size 0x%lx bytes\n",
(unsigned long)WORDS_TO_BYTES(hhdr -> hb_sz));
p += HBLKSIZE * OBJ_SZ_TO_BLOCKS(hhdr -> hb_sz);
}
}
}
}
# endif
static GC_bool setup_header(hhdr, sz, kind, flags)
register hdr * hhdr;
word sz;
int kind;
unsigned char flags;
{
register word descr;
if (!GC_add_map_entry(sz)) return(FALSE);
hhdr -> hb_map = GC_obj_map[sz > MAXOBJSZ? 0 : sz];
hhdr -> hb_sz = sz;
hhdr -> hb_obj_kind = kind;
hhdr -> hb_flags = flags;
descr = GC_obj_kinds[kind].ok_descriptor;
if (GC_obj_kinds[kind].ok_relocate_descr) descr += WORDS_TO_BYTES(sz);
hhdr -> hb_descr = descr;
GC_clear_hdr_marks(hhdr);
hhdr -> hb_last_reclaimed = (unsigned short)GC_gc_no;
return(TRUE);
}
#define FL_UNKNOWN -1
void GC_remove_from_fl(hhdr, n)
hdr * hhdr;
int n;
{
int index;
GC_ASSERT(((hhdr -> hb_sz) & (HBLKSIZE-1)) == 0);
# ifndef USE_MUNMAP
if (FL_UNKNOWN == n) {
index = GC_hblk_fl_from_blocks(divHBLKSZ(hhdr -> hb_sz));
} else {
index = n;
}
# endif
if (hhdr -> hb_prev == 0) {
# ifdef USE_MUNMAP
if (FL_UNKNOWN == n) {
index = GC_hblk_fl_from_blocks(divHBLKSZ(hhdr -> hb_sz));
} else {
index = n;
}
# endif
GC_ASSERT(HDR(GC_hblkfreelist[index]) == hhdr);
GC_hblkfreelist[index] = hhdr -> hb_next;
} else {
hdr *phdr;
GET_HDR(hhdr -> hb_prev, phdr);
phdr -> hb_next = hhdr -> hb_next;
}
INCR_FREE_BYTES(index, - (signed_word)(hhdr -> hb_sz));
FREE_ASSERT(GC_free_bytes[index] >= 0);
if (0 != hhdr -> hb_next) {
hdr * nhdr;
GC_ASSERT(!IS_FORWARDING_ADDR_OR_NIL(NHDR(hhdr)));
GET_HDR(hhdr -> hb_next, nhdr);
nhdr -> hb_prev = hhdr -> hb_prev;
}
}
struct hblk * GC_free_block_ending_at(h)
struct hblk *h;
{
struct hblk * p = h - 1;
hdr * phdr;
GET_HDR(p, phdr);
while (0 != phdr && IS_FORWARDING_ADDR_OR_NIL(phdr)) {
p = FORWARDED_ADDR(p,phdr);
phdr = HDR(p);
}
if (0 != phdr) {
if(HBLK_IS_FREE(phdr)) {
return p;
} else {
return 0;
}
}
p = GC_prev_block(h - 1);
if (0 != p) {
phdr = HDR(p);
if (HBLK_IS_FREE(phdr) && (ptr_t)p + phdr -> hb_sz == (ptr_t)h) {
return p;
}
}
return 0;
}
void GC_add_to_fl(h, hhdr)
struct hblk *h;
hdr * hhdr;
{
int index = GC_hblk_fl_from_blocks(divHBLKSZ(hhdr -> hb_sz));
struct hblk *second = GC_hblkfreelist[index];
hdr * second_hdr;
# ifdef GC_ASSERTIONS
struct hblk *next = (struct hblk *)((word)h + hhdr -> hb_sz);
hdr * nexthdr = HDR(next);
struct hblk *prev = GC_free_block_ending_at(h);
hdr * prevhdr = HDR(prev);
GC_ASSERT(nexthdr == 0 || !HBLK_IS_FREE(nexthdr) || !IS_MAPPED(nexthdr));
GC_ASSERT(prev == 0 || !HBLK_IS_FREE(prevhdr) || !IS_MAPPED(prevhdr));
# endif
GC_ASSERT(((hhdr -> hb_sz) & (HBLKSIZE-1)) == 0);
GC_hblkfreelist[index] = h;
INCR_FREE_BYTES(index, hhdr -> hb_sz);
FREE_ASSERT(GC_free_bytes[index] <= GC_large_free_bytes)
hhdr -> hb_next = second;
hhdr -> hb_prev = 0;
if (0 != second) {
GET_HDR(second, second_hdr);
second_hdr -> hb_prev = h;
}
GC_invalidate_map(hhdr);
}
#ifdef USE_MUNMAP
void GC_unmap_old(void)
{
struct hblk * h;
hdr * hhdr;
word sz;
unsigned short last_rec, threshold;
int i;
# define UNMAP_THRESHOLD 6
for (i = 0; i <= N_HBLK_FLS; ++i) {
for (h = GC_hblkfreelist[i]; 0 != h; h = hhdr -> hb_next) {
hhdr = HDR(h);
if (!IS_MAPPED(hhdr)) continue;
threshold = (unsigned short)(GC_gc_no - UNMAP_THRESHOLD);
last_rec = hhdr -> hb_last_reclaimed;
if (last_rec > GC_gc_no
|| last_rec < threshold && threshold < GC_gc_no
) {
sz = hhdr -> hb_sz;
GC_unmap((ptr_t)h, sz);
hhdr -> hb_flags |= WAS_UNMAPPED;
}
}
}
}
void GC_merge_unmapped(void)
{
struct hblk * h, *next;
hdr * hhdr, *nexthdr;
word size, nextsize;
int i;
for (i = 0; i <= N_HBLK_FLS; ++i) {
h = GC_hblkfreelist[i];
while (h != 0) {
GET_HDR(h, hhdr);
size = hhdr->hb_sz;
next = (struct hblk *)((word)h + size);
GET_HDR(next, nexthdr);
if (0 != nexthdr && HBLK_IS_FREE(nexthdr)) {
nextsize = nexthdr -> hb_sz;
if (IS_MAPPED(hhdr)) {
GC_ASSERT(!IS_MAPPED(nexthdr));
if (size > nextsize) {
GC_remap((ptr_t)next, nextsize);
} else {
GC_unmap((ptr_t)h, size);
hhdr -> hb_flags |= WAS_UNMAPPED;
}
} else if (IS_MAPPED(nexthdr)) {
GC_ASSERT(!IS_MAPPED(hhdr));
if (size > nextsize) {
GC_unmap((ptr_t)next, nextsize);
} else {
GC_remap((ptr_t)h, size);
hhdr -> hb_flags &= ~WAS_UNMAPPED;
}
} else {
GC_unmap_gap((ptr_t)h, size, (ptr_t)next, nexthdr -> hb_sz);
}
GC_remove_from_fl(hhdr, i);
GC_remove_from_fl(nexthdr, FL_UNKNOWN);
hhdr -> hb_sz += nexthdr -> hb_sz;
GC_remove_header(next);
GC_add_to_fl(h, hhdr);
h = GC_hblkfreelist[i];
} else {
h = hhdr -> hb_next;
}
}
}
}
#endif
struct hblk * GC_get_first_part(h, hhdr, bytes, index)
struct hblk *h;
hdr * hhdr;
word bytes;
int index;
{
word total_size = hhdr -> hb_sz;
struct hblk * rest;
hdr * rest_hdr;
GC_ASSERT((total_size & (HBLKSIZE-1)) == 0);
GC_remove_from_fl(hhdr, index);
if (total_size == bytes) return h;
rest = (struct hblk *)((word)h + bytes);
rest_hdr = GC_install_header(rest);
if (0 == rest_hdr) return(0);
rest_hdr -> hb_sz = total_size - bytes;
rest_hdr -> hb_flags = 0;
# ifdef GC_ASSERTIONS
hhdr -> hb_map = 0;
# endif
GC_add_to_fl(rest, rest_hdr);
return h;
}
void GC_split_block(h, hhdr, n, nhdr, index)
struct hblk *h;
hdr * hhdr;
struct hblk *n;
hdr * nhdr;
int index;
{
word total_size = hhdr -> hb_sz;
word h_size = (word)n - (word)h;
struct hblk *prev = hhdr -> hb_prev;
struct hblk *next = hhdr -> hb_next;
nhdr -> hb_prev = prev;
nhdr -> hb_next = next;
nhdr -> hb_sz = total_size - h_size;
nhdr -> hb_flags = 0;
if (0 != prev) {
HDR(prev) -> hb_next = n;
} else {
GC_hblkfreelist[index] = n;
}
if (0 != next) {
HDR(next) -> hb_prev = n;
}
INCR_FREE_BYTES(index, -(signed_word)h_size);
FREE_ASSERT(GC_free_bytes[index] > 0);
# ifdef GC_ASSERTIONS
nhdr -> hb_map = 0;
# endif
# ifdef USE_MUNMAP
hhdr -> hb_last_reclaimed = GC_gc_no;
# endif
hhdr -> hb_sz = h_size;
GC_add_to_fl(h, hhdr);
GC_invalidate_map(nhdr);
}
struct hblk * GC_allochblk_nth();
struct hblk *
GC_allochblk(sz, kind, flags)
word sz;
int kind;
unsigned flags;
{
word blocks = OBJ_SZ_TO_BLOCKS(sz);
int start_list = GC_hblk_fl_from_blocks(blocks);
int i;
for (i = start_list; i <= N_HBLK_FLS; ++i) {
struct hblk * result = GC_allochblk_nth(sz, kind, flags, i);
if (0 != result) {
return result;
}
}
return 0;
}
struct hblk *
GC_allochblk_nth(sz, kind, flags, n)
word sz;
int kind;
unsigned char flags;
int n;
{
register struct hblk *hbp;
register hdr * hhdr;
register struct hblk *thishbp;
register hdr * thishdr;
signed_word size_needed;
signed_word size_avail;
size_needed = HBLKSIZE * OBJ_SZ_TO_BLOCKS(sz);
hbp = GC_hblkfreelist[n];
for(; 0 != hbp; hbp = hhdr -> hb_next) {
GET_HDR(hbp, hhdr);
size_avail = hhdr->hb_sz;
if (size_avail < size_needed) continue;
if (!GC_use_entire_heap
&& size_avail != size_needed
&& USED_HEAP_SIZE >= GC_requested_heapsize
&& !GC_incremental && GC_should_collect()) {
# ifdef USE_MUNMAP
continue;
# else
if (!GC_enough_large_bytes_left(GC_large_allocd_bytes, n)) {
continue;
}
# endif
}
{
signed_word next_size;
thishbp = hhdr -> hb_next;
if (thishbp != 0) {
GET_HDR(thishbp, thishdr);
next_size = (signed_word)(thishdr -> hb_sz);
if (next_size < size_avail
&& next_size >= size_needed
&& !GC_is_black_listed(thishbp, (word)size_needed)) {
continue;
}
}
}
if ( !IS_UNCOLLECTABLE(kind) &&
(kind != PTRFREE || size_needed > MAX_BLACK_LIST_ALLOC)) {
struct hblk * lasthbp = hbp;
ptr_t search_end = (ptr_t)hbp + size_avail - size_needed;
signed_word orig_avail = size_avail;
signed_word eff_size_needed = ((flags & IGNORE_OFF_PAGE)?
HBLKSIZE
: size_needed);
while ((ptr_t)lasthbp <= search_end
&& (thishbp = GC_is_black_listed(lasthbp,
(word)eff_size_needed))
!= 0) {
lasthbp = thishbp;
}
size_avail -= (ptr_t)lasthbp - (ptr_t)hbp;
thishbp = lasthbp;
if (size_avail >= size_needed) {
if (thishbp != hbp &&
0 != (thishdr = GC_install_header(thishbp))) {
# ifdef USE_MUNMAP
if (!IS_MAPPED(hhdr)) {
GC_remap((ptr_t)hbp, hhdr -> hb_sz);
hhdr -> hb_flags &= ~WAS_UNMAPPED;
}
# endif
GC_split_block(hbp, hhdr, thishbp, thishdr, n);
hbp = thishbp;
hhdr = thishdr;
}
} else if (size_needed > (signed_word)BL_LIMIT
&& orig_avail - size_needed
> (signed_word)BL_LIMIT) {
if (++GC_large_alloc_warn_suppressed
>= GC_large_alloc_warn_interval) {
WARN("Repeated allocation of very large block "
"(appr. size %ld):\n"
"\tMay lead to memory leak and poor performance.\n",
size_needed);
GC_large_alloc_warn_suppressed = 0;
}
size_avail = orig_avail;
} else if (size_avail == 0 && size_needed == HBLKSIZE
&& IS_MAPPED(hhdr)) {
if (!GC_find_leak) {
static unsigned count = 0;
if ((++count & 3) == 0) {
word total_size = hhdr -> hb_sz;
struct hblk * limit = hbp + divHBLKSZ(total_size);
struct hblk * h;
struct hblk * prev = hhdr -> hb_prev;
GC_words_wasted += total_size;
GC_large_free_bytes -= total_size;
GC_remove_from_fl(hhdr, n);
for (h = hbp; h < limit; h++) {
if (h == hbp || 0 != (hhdr = GC_install_header(h))) {
(void) setup_header(
hhdr,
BYTES_TO_WORDS(HBLKSIZE),
PTRFREE, 0);
if (GC_debugging_started) {
BZERO(h, HBLKSIZE);
}
}
}
hbp = prev;
if (0 == hbp) {
return GC_allochblk_nth(sz, kind, flags, n);
}
hhdr = HDR(hbp);
}
}
}
}
if( size_avail >= size_needed ) {
# ifdef USE_MUNMAP
if (!IS_MAPPED(hhdr)) {
GC_remap((ptr_t)hbp, hhdr -> hb_sz);
hhdr -> hb_flags &= ~WAS_UNMAPPED;
}
# endif
hbp = GC_get_first_part(hbp, hhdr, size_needed, n);
break;
}
}
if (0 == hbp) return 0;
if (!GC_install_counts(hbp, (word)size_needed)) return(0);
if (!setup_header(hhdr, sz, kind, flags)) {
GC_remove_counts(hbp, (word)size_needed);
return(0);
}
GC_remove_protection(hbp, divHBLKSZ(size_needed),
(hhdr -> hb_descr == 0) );
{
extern unsigned GC_fail_count;
GC_fail_count = 0;
}
GC_large_free_bytes -= size_needed;
GC_ASSERT(IS_MAPPED(hhdr));
return( hbp );
}
struct hblk * GC_freehblk_ptr = 0;
void
GC_freehblk(hbp)
struct hblk *hbp;
{
struct hblk *next, *prev;
hdr *hhdr, *prevhdr, *nexthdr;
signed_word size;
GET_HDR(hbp, hhdr);
size = hhdr->hb_sz;
size = HBLKSIZE * OBJ_SZ_TO_BLOCKS(size);
GC_remove_counts(hbp, (word)size);
hhdr->hb_sz = size;
if (HBLK_IS_FREE(hhdr)) {
GC_printf1("Duplicate large block deallocation of 0x%lx\n",
(unsigned long) hbp);
ABORT("Duplicate large block deallocation");
}
GC_ASSERT(IS_MAPPED(hhdr));
GC_invalidate_map(hhdr);
next = (struct hblk *)((word)hbp + size);
GET_HDR(next, nexthdr);
prev = GC_free_block_ending_at(hbp);
if(0 != nexthdr && HBLK_IS_FREE(nexthdr) && IS_MAPPED(nexthdr)) {
GC_remove_from_fl(nexthdr, FL_UNKNOWN);
hhdr -> hb_sz += nexthdr -> hb_sz;
GC_remove_header(next);
}
if (0 != prev) {
prevhdr = HDR(prev);
if (IS_MAPPED(prevhdr)) {
GC_remove_from_fl(prevhdr, FL_UNKNOWN);
prevhdr -> hb_sz += hhdr -> hb_sz;
GC_remove_header(hbp);
hbp = prev;
hhdr = prevhdr;
}
}
GC_large_free_bytes += size;
GC_add_to_fl(hbp, hhdr);
}