611 lines
17 KiB
C
611 lines
17 KiB
C
/*
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* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
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* Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
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* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
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* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*/
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#include <stdio.h>
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#include "private/gc_priv.h"
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signed_word GC_bytes_found = 0;
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/* Number of bytes of memory reclaimed */
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/* minus the number of bytes originally */
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/* on free lists which we had to drop. */
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#if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
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word GC_fl_builder_count = 0;
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/* Number of threads currently building free lists without */
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/* holding GC lock. It is not safe to collect if this is */
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/* nonzero. */
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#endif /* PARALLEL_MARK */
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/* We defer printing of leaked objects until we're done with the GC */
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/* cycle, since the routine for printing objects needs to run outside */
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/* the collector, e.g. without the allocation lock. */
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#define MAX_LEAKED 40
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ptr_t GC_leaked[MAX_LEAKED];
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unsigned GC_n_leaked = 0;
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GC_bool GC_have_errors = FALSE;
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void GC_add_leaked(ptr_t leaked)
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{
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if (GC_n_leaked < MAX_LEAKED) {
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GC_have_errors = TRUE;
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GC_leaked[GC_n_leaked++] = leaked;
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/* Make sure it's not reclaimed this cycle */
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GC_set_mark_bit(leaked);
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}
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}
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static GC_bool printing_errors = FALSE;
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/* Print all objects on the list after printing any smashed objs. */
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/* Clear both lists. */
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void GC_print_all_errors ()
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{
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unsigned i;
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LOCK();
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if (printing_errors) {
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UNLOCK();
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return;
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}
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printing_errors = TRUE;
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UNLOCK();
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if (GC_debugging_started) GC_print_all_smashed();
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for (i = 0; i < GC_n_leaked; ++i) {
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ptr_t p = GC_leaked[i];
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if (HDR(p) -> hb_obj_kind == PTRFREE) {
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GC_err_printf("Leaked atomic object at ");
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} else {
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GC_err_printf("Leaked composite object at ");
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}
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GC_print_heap_obj(p);
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GC_err_printf("\n");
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GC_free(p);
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GC_leaked[i] = 0;
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}
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GC_n_leaked = 0;
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printing_errors = FALSE;
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}
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/*
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* reclaim phase
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*
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*/
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/*
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* Test whether a block is completely empty, i.e. contains no marked
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* objects. This does not require the block to be in physical
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* memory.
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*/
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GC_bool GC_block_empty(hdr *hhdr)
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{
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return (hhdr -> hb_n_marks == 0);
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}
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GC_bool GC_block_nearly_full(hdr *hhdr)
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{
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return (hhdr -> hb_n_marks > 7 * HBLK_OBJS(hhdr -> hb_sz)/8);
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}
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/* FIXME: This should perhaps again be specialized for USE_MARK_BYTES */
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/* and USE_MARK_BITS cases. */
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/*
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* Restore unmarked small objects in h of size sz to the object
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* free list. Returns the new list.
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* Clears unmarked objects. Sz is in bytes.
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*/
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/*ARGSUSED*/
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ptr_t GC_reclaim_clear(struct hblk *hbp, hdr *hhdr, size_t sz,
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ptr_t list, signed_word *count)
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{
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word bit_no = 0;
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word *p, *q, *plim;
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signed_word n_bytes_found = 0;
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GC_ASSERT(hhdr == GC_find_header((ptr_t)hbp));
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GC_ASSERT(sz == hhdr -> hb_sz);
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GC_ASSERT((sz & (BYTES_PER_WORD-1)) == 0);
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p = (word *)(hbp->hb_body);
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plim = (word *)(hbp->hb_body + HBLKSIZE - sz);
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/* go through all words in block */
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while( p <= plim ) {
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if( mark_bit_from_hdr(hhdr, bit_no) ) {
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p = (word *)((ptr_t)p + sz);
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} else {
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n_bytes_found += sz;
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/* object is available - put on list */
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obj_link(p) = list;
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list = ((ptr_t)p);
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/* Clear object, advance p to next object in the process */
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q = (word *)((ptr_t)p + sz);
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# ifdef USE_MARK_BYTES
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GC_ASSERT(!(sz & 1)
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&& !((word)p & (2 * sizeof(word) - 1)));
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p[1] = 0;
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p += 2;
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while (p < q) {
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CLEAR_DOUBLE(p);
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p += 2;
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}
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# else
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p++; /* Skip link field */
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while (p < q) {
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*p++ = 0;
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}
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# endif
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}
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bit_no += MARK_BIT_OFFSET(sz);
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}
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*count += n_bytes_found;
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return(list);
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}
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/* The same thing, but don't clear objects: */
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/*ARGSUSED*/
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ptr_t GC_reclaim_uninit(struct hblk *hbp, hdr *hhdr, size_t sz,
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ptr_t list, signed_word *count)
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{
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word bit_no = 0;
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word *p, *plim;
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signed_word n_bytes_found = 0;
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GC_ASSERT(sz == hhdr -> hb_sz);
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p = (word *)(hbp->hb_body);
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plim = (word *)((ptr_t)hbp + HBLKSIZE - sz);
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/* go through all words in block */
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while( p <= plim ) {
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if( !mark_bit_from_hdr(hhdr, bit_no) ) {
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n_bytes_found += sz;
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/* object is available - put on list */
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obj_link(p) = list;
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list = ((ptr_t)p);
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}
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p = (word *)((ptr_t)p + sz);
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bit_no += MARK_BIT_OFFSET(sz);
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}
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*count += n_bytes_found;
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return(list);
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}
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/* Don't really reclaim objects, just check for unmarked ones: */
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/*ARGSUSED*/
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void GC_reclaim_check(struct hblk *hbp, hdr *hhdr, word sz)
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{
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word bit_no = 0;
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ptr_t p, plim;
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GC_ASSERT(sz == hhdr -> hb_sz);
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p = hbp->hb_body;
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plim = p + HBLKSIZE - sz;
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/* go through all words in block */
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while( p <= plim ) {
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if( !mark_bit_from_hdr(hhdr, bit_no) ) {
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GC_add_leaked(p);
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}
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p += sz;
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bit_no += MARK_BIT_OFFSET(sz);
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}
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}
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/*
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* Generic procedure to rebuild a free list in hbp.
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* Also called directly from GC_malloc_many.
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* Sz is now in bytes.
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*/
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ptr_t GC_reclaim_generic(struct hblk * hbp, hdr *hhdr, size_t sz,
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GC_bool init, ptr_t list, signed_word *count)
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{
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ptr_t result = list;
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GC_ASSERT(GC_find_header((ptr_t)hbp) == hhdr);
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GC_remove_protection(hbp, 1, (hhdr)->hb_descr == 0 /* Pointer-free? */);
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if (init) {
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result = GC_reclaim_clear(hbp, hhdr, sz, list, count);
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} else {
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GC_ASSERT((hhdr)->hb_descr == 0 /* Pointer-free block */);
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result = GC_reclaim_uninit(hbp, hhdr, sz, list, count);
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}
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if (IS_UNCOLLECTABLE(hhdr -> hb_obj_kind)) GC_set_hdr_marks(hhdr);
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return result;
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}
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/*
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* Restore unmarked small objects in the block pointed to by hbp
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* to the appropriate object free list.
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* If entirely empty blocks are to be completely deallocated, then
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* caller should perform that check.
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*/
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void GC_reclaim_small_nonempty_block(struct hblk *hbp,
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int report_if_found, signed_word *count)
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{
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hdr *hhdr = HDR(hbp);
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size_t sz = hhdr -> hb_sz;
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int kind = hhdr -> hb_obj_kind;
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struct obj_kind * ok = &GC_obj_kinds[kind];
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void **flh = &(ok -> ok_freelist[BYTES_TO_GRANULES(sz)]);
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hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
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if (report_if_found) {
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GC_reclaim_check(hbp, hhdr, sz);
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} else {
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*flh = GC_reclaim_generic(hbp, hhdr, sz,
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(ok -> ok_init || GC_debugging_started),
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*flh, &GC_bytes_found);
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}
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}
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/*
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* Restore an unmarked large object or an entirely empty blocks of small objects
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* to the heap block free list.
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* Otherwise enqueue the block for later processing
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* by GC_reclaim_small_nonempty_block.
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* If report_if_found is TRUE, then process any block immediately, and
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* simply report free objects; do not actually reclaim them.
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*/
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void GC_reclaim_block(struct hblk *hbp, word report_if_found)
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{
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hdr * hhdr = HDR(hbp);
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size_t sz = hhdr -> hb_sz; /* size of objects in current block */
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struct obj_kind * ok = &GC_obj_kinds[hhdr -> hb_obj_kind];
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struct hblk ** rlh;
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if( sz > MAXOBJBYTES ) { /* 1 big object */
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if( !mark_bit_from_hdr(hhdr, 0) ) {
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if (report_if_found) {
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GC_add_leaked((ptr_t)hbp);
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} else {
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size_t blocks = OBJ_SZ_TO_BLOCKS(sz);
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if (blocks > 1) {
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GC_large_allocd_bytes -= blocks * HBLKSIZE;
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}
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GC_bytes_found += sz;
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GC_freehblk(hbp);
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}
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} else {
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if (hhdr -> hb_descr != 0) {
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GC_composite_in_use += sz;
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} else {
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GC_atomic_in_use += sz;
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}
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}
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} else {
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GC_bool empty = GC_block_empty(hhdr);
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# ifdef PARALLEL_MARK
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/* Count can be low or one too high because we sometimes */
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/* have to ignore decrements. Objects can also potentially */
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/* be repeatedly marked by each marker. */
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/* Here we assume two markers, but this is extremely */
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/* unlikely to fail spuriously with more. And if it does, it */
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/* should be looked at. */
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GC_ASSERT(hhdr -> hb_n_marks <= 2 * (HBLKSIZE/sz + 1) + 16);
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# else
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GC_ASSERT(sz * hhdr -> hb_n_marks <= HBLKSIZE);
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# endif
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if (hhdr -> hb_descr != 0) {
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GC_composite_in_use += sz * hhdr -> hb_n_marks;
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} else {
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GC_atomic_in_use += sz * hhdr -> hb_n_marks;
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}
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if (report_if_found) {
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GC_reclaim_small_nonempty_block(hbp, (int)report_if_found,
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&GC_bytes_found);
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} else if (empty) {
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GC_bytes_found += HBLKSIZE;
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GC_freehblk(hbp);
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} else if (TRUE != GC_block_nearly_full(hhdr)){
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/* group of smaller objects, enqueue the real work */
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rlh = &(ok -> ok_reclaim_list[BYTES_TO_GRANULES(sz)]);
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hhdr -> hb_next = *rlh;
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*rlh = hbp;
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} /* else not worth salvaging. */
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/* We used to do the nearly_full check later, but we */
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/* already have the right cache context here. Also */
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/* doing it here avoids some silly lock contention in */
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/* GC_malloc_many. */
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}
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}
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#if !defined(NO_DEBUGGING)
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/* Routines to gather and print heap block info */
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/* intended for debugging. Otherwise should be called */
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/* with lock. */
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struct Print_stats
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{
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size_t number_of_blocks;
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size_t total_bytes;
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};
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#ifdef USE_MARK_BYTES
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/* Return the number of set mark bits in the given header */
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int GC_n_set_marks(hdr *hhdr)
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{
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int result = 0;
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int i;
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size_t sz = hhdr -> hb_sz;
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int offset = MARK_BIT_OFFSET(sz);
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int limit = FINAL_MARK_BIT(sz);
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for (i = 0; i < limit; i += offset) {
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result += hhdr -> hb_marks[i];
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}
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GC_ASSERT(hhdr -> hb_marks[limit]);
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return(result);
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}
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#else
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/* Number of set bits in a word. Not performance critical. */
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static int set_bits(word n)
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{
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word m = n;
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int result = 0;
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while (m > 0) {
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if (m & 1) result++;
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m >>= 1;
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}
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return(result);
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}
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/* Return the number of set mark bits in the given header */
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int GC_n_set_marks(hdr *hhdr)
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{
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int result = 0;
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int i;
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int n_mark_words;
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# ifdef MARK_BIT_PER_OBJ
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int n_objs = HBLK_OBJS(hhdr -> hb_sz);
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if (0 == n_objs) n_objs = 1;
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n_mark_words = divWORDSZ(n_objs + WORDSZ - 1);
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# else /* MARK_BIT_PER_GRANULE */
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n_mark_words = MARK_BITS_SZ;
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# endif
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for (i = 0; i < n_mark_words - 1; i++) {
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result += set_bits(hhdr -> hb_marks[i]);
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}
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# ifdef MARK_BIT_PER_OBJ
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result += set_bits((hhdr -> hb_marks[n_mark_words - 1])
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<< (n_mark_words * WORDSZ - n_objs));
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# else
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result += set_bits(hhdr -> hb_marks[n_mark_words - 1]);
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# endif
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return(result - 1);
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}
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#endif /* !USE_MARK_BYTES */
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/*ARGSUSED*/
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void GC_print_block_descr(struct hblk *h, word /* struct PrintStats */ raw_ps)
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{
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hdr * hhdr = HDR(h);
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size_t bytes = hhdr -> hb_sz;
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struct Print_stats *ps;
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unsigned n_marks = GC_n_set_marks(hhdr);
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if (hhdr -> hb_n_marks != n_marks) {
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GC_printf("(%u:%u,%u!=%u)", hhdr -> hb_obj_kind,
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bytes,
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hhdr -> hb_n_marks, n_marks);
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} else {
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GC_printf("(%u:%u,%u)", hhdr -> hb_obj_kind,
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bytes, n_marks);
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}
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bytes += HBLKSIZE-1;
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bytes &= ~(HBLKSIZE-1);
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ps = (struct Print_stats *)raw_ps;
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ps->total_bytes += bytes;
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ps->number_of_blocks++;
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}
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void GC_print_block_list()
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{
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struct Print_stats pstats;
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GC_printf("(kind(0=ptrfree,1=normal,2=unc.):size_in_bytes, #_marks_set)\n");
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pstats.number_of_blocks = 0;
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pstats.total_bytes = 0;
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GC_apply_to_all_blocks(GC_print_block_descr, (word)&pstats);
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GC_printf("\nblocks = %lu, bytes = %lu\n",
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(unsigned long)pstats.number_of_blocks,
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(unsigned long)pstats.total_bytes);
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}
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/* Currently for debugger use only: */
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void GC_print_free_list(int kind, size_t sz_in_granules)
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{
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struct obj_kind * ok = &GC_obj_kinds[kind];
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ptr_t flh = ok -> ok_freelist[sz_in_granules];
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struct hblk *lastBlock = 0;
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int n = 0;
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while (flh){
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struct hblk *block = HBLKPTR(flh);
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if (block != lastBlock){
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GC_printf("\nIn heap block at 0x%x:\n\t", block);
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lastBlock = block;
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}
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GC_printf("%d: 0x%x;", ++n, flh);
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flh = obj_link(flh);
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}
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}
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#endif /* NO_DEBUGGING */
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/*
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* Clear all obj_link pointers in the list of free objects *flp.
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* Clear *flp.
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* This must be done before dropping a list of free gcj-style objects,
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* since may otherwise end up with dangling "descriptor" pointers.
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* It may help for other pointer-containing objects.
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*/
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void GC_clear_fl_links(void **flp)
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{
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void *next = *flp;
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while (0 != next) {
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*flp = 0;
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flp = &(obj_link(next));
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next = *flp;
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}
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}
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/*
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* Perform GC_reclaim_block on the entire heap, after first clearing
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* small object free lists (if we are not just looking for leaks).
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*/
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void GC_start_reclaim(GC_bool report_if_found)
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{
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unsigned kind;
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# if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
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GC_ASSERT(0 == GC_fl_builder_count);
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# endif
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/* Reset in use counters. GC_reclaim_block recomputes them. */
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GC_composite_in_use = 0;
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GC_atomic_in_use = 0;
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/* Clear reclaim- and free-lists */
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for (kind = 0; kind < GC_n_kinds; kind++) {
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void **fop;
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void **lim;
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struct hblk ** rlp;
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struct hblk ** rlim;
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struct hblk ** rlist = GC_obj_kinds[kind].ok_reclaim_list;
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GC_bool should_clobber = (GC_obj_kinds[kind].ok_descriptor != 0);
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|
|
|
if (rlist == 0) continue; /* This kind not used. */
|
|
if (!report_if_found) {
|
|
lim = &(GC_obj_kinds[kind].ok_freelist[MAXOBJGRANULES+1]);
|
|
for( fop = GC_obj_kinds[kind].ok_freelist; fop < lim; fop++ ) {
|
|
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 */
|
|
rlim = rlist + MAXOBJGRANULES+1;
|
|
for( rlp = rlist; rlp < rlim; rlp++ ) {
|
|
*rlp = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* 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)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
|
|
|
|
}
|
|
|
|
/*
|
|
* Sweep blocks of the indicated object size and kind until either the
|
|
* appropriate free list is nonempty, or there are no more blocks to
|
|
* sweep.
|
|
*/
|
|
void GC_continue_reclaim(size_t sz /* granules */, int kind)
|
|
{
|
|
hdr * hhdr;
|
|
struct hblk * hbp;
|
|
struct obj_kind * ok = &(GC_obj_kinds[kind]);
|
|
struct hblk ** rlh = ok -> ok_reclaim_list;
|
|
void **flh = &(ok -> ok_freelist[sz]);
|
|
|
|
if (rlh == 0) return; /* No blocks of this kind. */
|
|
rlh += sz;
|
|
while ((hbp = *rlh) != 0) {
|
|
hhdr = HDR(hbp);
|
|
*rlh = hhdr -> hb_next;
|
|
GC_reclaim_small_nonempty_block(hbp, FALSE, &GC_bytes_found);
|
|
if (*flh != 0) break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Reclaim all small blocks waiting to be reclaimed.
|
|
* 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 reclaim only blocks that have been
|
|
* recently reclaimed, and discard the rest.
|
|
* Stop_func may be 0.
|
|
*/
|
|
GC_bool GC_reclaim_all(GC_stop_func stop_func, GC_bool ignore_old)
|
|
{
|
|
word sz;
|
|
unsigned kind;
|
|
hdr * hhdr;
|
|
struct hblk * hbp;
|
|
struct obj_kind * ok;
|
|
struct hblk ** rlp;
|
|
struct hblk ** rlh;
|
|
CLOCK_TYPE start_time;
|
|
CLOCK_TYPE done_time;
|
|
|
|
if (GC_print_stats == VERBOSE)
|
|
GET_TIME(start_time);
|
|
|
|
for (kind = 0; kind < GC_n_kinds; kind++) {
|
|
ok = &(GC_obj_kinds[kind]);
|
|
rlp = ok -> ok_reclaim_list;
|
|
if (rlp == 0) continue;
|
|
for (sz = 1; sz <= MAXOBJGRANULES; sz++) {
|
|
rlh = rlp + sz;
|
|
while ((hbp = *rlh) != 0) {
|
|
if (stop_func != (GC_stop_func)0 && (*stop_func)()) {
|
|
return(FALSE);
|
|
}
|
|
hhdr = HDR(hbp);
|
|
*rlh = hhdr -> hb_next;
|
|
if (!ignore_old || hhdr -> hb_last_reclaimed == GC_gc_no - 1) {
|
|
/* 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_bytes_found);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (GC_print_stats == VERBOSE) {
|
|
GET_TIME(done_time);
|
|
GC_log_printf("Disposing of reclaim lists took %lu msecs\n",
|
|
MS_TIME_DIFF(done_time,start_time));
|
|
}
|
|
return(TRUE);
|
|
}
|