/*
* Generic procedure to rebuild a free list in hbp.
* Also called directly from GC_malloc_many.
* Sz is now in bytes.
*/
ptr_t GC_reclaim_generic(struct hblk * hbp, hdr *hhdr, size_t sz,
GC_bool init, ptr_t list, signed_word *count)
{
ptr_t result = list;
GC_ASSERT(GC_find_header((ptr_t)hbp) == hhdr);
GC_remove_protection(hbp, 1, (hhdr)->hb_descr == 0 /* Pointer-free? */);
if (init) {
result = GC_reclaim_clear(hbp, hhdr, sz, list, count);
} else {
GC_ASSERT((hhdr)->hb_descr == 0 /* Pointer-free block */);
result = GC_reclaim_uninit(hbp, hhdr, sz, list, count);
}
if (IS_UNCOLLECTABLE(hhdr -> hb_obj_kind)) GC_set_hdr_marks(hhdr);
return result;
}
/*
* Restore unmarked small objects in h of size sz to the object
* free list. Returns the new list.
* Clears unmarked objects. Sz is in bytes.
*/
STATIC ptr_t GC_reclaim_clear(struct hblk *hbp, hdr *hhdr, size_t sz,
ptr_t list, signed_word *count)
{
word bit_no = 0;
word *p, *q, *plim;
signed_word n_bytes_found = 0;
GC_ASSERT(hhdr == GC_find_header((ptr_t)hbp));
GC_ASSERT(sz == hhdr -> hb_sz);
GC_ASSERT((sz & (BYTES_PER_WORD-1)) == 0);
p = (word *)(hbp->hb_body);
plim = (word *)(hbp->hb_body + HBLKSIZE - sz);
/* go through all words in block */
while (p <= plim) {
if( mark_bit_from_hdr(hhdr, bit_no) ) {
p = (word *)((ptr_t)p + sz);
} else {
n_bytes_found += 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 = (word *)((ptr_t)p + sz);
# 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
}
bit_no += MARK_BIT_OFFSET(sz);
}
*count += n_bytes_found;
return(list);
}
/* is p. */
STATIC void GC_print_type(ptr_t p)
{
hdr * hhdr = GC_find_header(p);
char buffer[GC_TYPE_DESCR_LEN + 1];
int kind = hhdr -> hb_obj_kind;
if (0 != GC_describe_type_fns[kind] && GC_is_marked(GC_base(p))) {
/* This should preclude free list objects except with */
/* thread-local allocation. */
buffer[GC_TYPE_DESCR_LEN] = 0;
(GC_describe_type_fns[kind])(p, buffer);
GC_ASSERT(buffer[GC_TYPE_DESCR_LEN] == 0);
GC_err_puts(buffer);
} else {
switch(kind) {
case PTRFREE:
GC_err_puts("PTRFREE");
break;
case NORMAL:
GC_err_puts("NORMAL");
break;
case UNCOLLECTABLE:
GC_err_puts("UNCOLLECTABLE");
break;
# ifdef ATOMIC_UNCOLLECTABLE
case AUNCOLLECTABLE:
GC_err_puts("ATOMIC UNCOLLECTABLE");
break;
# endif
case STUBBORN:
GC_err_puts("STUBBORN");
break;
default:
GC_err_printf("kind=%d descr=0x%lx", kind,
(unsigned long)(hhdr -> hb_descr));
}
}
}
/* p points to somewhere inside an object with the debugging info. */
STATIC void GC_print_obj(ptr_t p)
{
oh * ohdr = (oh *)GC_base(p);
ptr_t q;
hdr * hhdr;
int kind;
const char *kind_str;
char buffer[GC_TYPE_DESCR_LEN + 1];
GC_ASSERT(I_DONT_HOLD_LOCK());
# ifdef LINT2
if (!ohdr) ABORT("Invalid GC_print_obj argument");
# endif
q = (ptr_t)(ohdr + 1);
/* Print a type description for the object whose client-visible */
/* address is q. */
hhdr = GC_find_header(q);
kind = hhdr -> hb_obj_kind;
if (0 != GC_describe_type_fns[kind] && GC_is_marked(ohdr)) {
/* This should preclude free list objects except with */
/* thread-local allocation. */
buffer[GC_TYPE_DESCR_LEN] = 0;
(GC_describe_type_fns[kind])(q, buffer);
GC_ASSERT(buffer[GC_TYPE_DESCR_LEN] == 0);
kind_str = buffer;
} else {
switch(kind) {
case PTRFREE:
kind_str = "PTRFREE";
break;
case NORMAL:
kind_str = "NORMAL";
break;
case UNCOLLECTABLE:
kind_str = "UNCOLLECTABLE";
break;
# ifdef GC_ATOMIC_UNCOLLECTABLE
case AUNCOLLECTABLE:
kind_str = "ATOMIC_UNCOLLECTABLE";
break;
# endif
default:
kind_str = NULL;
/* The alternative is to use snprintf(buffer) but it is */
/* not quite portable (see vsnprintf in misc.c). */
}
}
if (NULL != kind_str) {
GC_err_printf("%p (%s:%d," IF_NOT_SHORTDBG_HDRS(" sz=%lu,") " %s)\n",
(void *)((ptr_t)ohdr + sizeof(oh)),
ohdr->oh_string, GET_OH_LINENUM(ohdr) /*, */
COMMA_IFNOT_SHORTDBG_HDRS((unsigned long)ohdr->oh_sz),
kind_str);
} else {
GC_err_printf("%p (%s:%d," IF_NOT_SHORTDBG_HDRS(" sz=%lu,")
" kind=%d descr=0x%lx)\n",
(void *)((ptr_t)ohdr + sizeof(oh)),
ohdr->oh_string, GET_OH_LINENUM(ohdr) /*, */
COMMA_IFNOT_SHORTDBG_HDRS((unsigned long)ohdr->oh_sz),
kind, (unsigned long)hhdr->hb_descr);
}
PRINT_CALL_CHAIN(ohdr);
}
