1
by Ryan Murray
Import upstream version 6.0+6.1alpha4 |
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/*
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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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* 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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/* Boehm, February 1, 1996 1:19 pm PST */
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# define I_HIDE_POINTERS
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# include "private/gc_pmark.h"
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# ifdef FINALIZE_ON_DEMAND
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int GC_finalize_on_demand = 1; |
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# else
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int GC_finalize_on_demand = 0; |
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# endif
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# ifdef JAVA_FINALIZATION
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int GC_java_finalization = 1; |
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# else
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int GC_java_finalization = 0; |
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# endif
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/* Type of mark procedure used for marking from finalizable object. */
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/* This procedure normally does not mark the object, only its */
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/* descendents. */
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typedef void finalization_mark_proc(/* ptr_t finalizable_obj_ptr */); |
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# define HASH3(addr,size,log_size) \
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((((word)(addr) >> 3) ^ ((word)(addr) >> (3+(log_size)))) \
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& ((size) - 1))
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#define HASH2(addr,log_size) HASH3(addr, 1 << log_size, log_size)
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struct hash_chain_entry { |
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word hidden_key; |
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struct hash_chain_entry * next; |
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};
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unsigned GC_finalization_failures = 0; |
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/* Number of finalization requests that failed for lack of memory. */
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static struct disappearing_link { |
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struct hash_chain_entry prolog; |
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# define dl_hidden_link prolog.hidden_key
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/* Field to be cleared. */
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# define dl_next(x) (struct disappearing_link *)((x) -> prolog.next)
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# define dl_set_next(x,y) (x) -> prolog.next = (struct hash_chain_entry *)(y)
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word dl_hidden_obj; /* Pointer to object base */ |
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} **dl_head = 0; |
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static signed_word log_dl_table_size = -1; |
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/* Binary log of */
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/* current size of array pointed to by dl_head. */
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/* -1 ==> size is 0. */
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word GC_dl_entries = 0; /* Number of entries currently in disappearing */ |
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/* link table. */
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static struct finalizable_object { |
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struct hash_chain_entry prolog; |
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# define fo_hidden_base prolog.hidden_key
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/* Pointer to object base. */
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/* No longer hidden once object */
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/* is on finalize_now queue. */
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# define fo_next(x) (struct finalizable_object *)((x) -> prolog.next)
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# define fo_set_next(x,y) (x) -> prolog.next = (struct hash_chain_entry *)(y)
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GC_finalization_proc fo_fn; /* Finalizer. */ |
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ptr_t fo_client_data; |
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word fo_object_size; /* In bytes. */ |
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finalization_mark_proc * fo_mark_proc; /* Mark-through procedure */ |
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} **fo_head = 0; |
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struct finalizable_object * GC_finalize_now = 0; |
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/* LIst of objects that should be finalized now. */
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static signed_word log_fo_table_size = -1; |
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word GC_fo_entries = 0; |
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void GC_push_finalizer_structures GC_PROTO((void)) |
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{
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GC_push_all((ptr_t)(&dl_head), (ptr_t)(&dl_head) + sizeof(word)); |
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GC_push_all((ptr_t)(&fo_head), (ptr_t)(&fo_head) + sizeof(word)); |
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GC_push_all((ptr_t)(&GC_finalize_now), |
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(ptr_t)(&GC_finalize_now) + sizeof(word)); |
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}
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/* Double the size of a hash table. *size_ptr is the log of its current */
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/* size. May be a noop. */
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/* *table is a pointer to an array of hash headers. If we succeed, we */
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/* update both *table and *log_size_ptr. */
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/* Lock is held. Signals are disabled. */
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void GC_grow_table(table, log_size_ptr) |
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struct hash_chain_entry ***table; |
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signed_word * log_size_ptr; |
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{
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register word i; |
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register struct hash_chain_entry *p; |
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int log_old_size = *log_size_ptr; |
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register int log_new_size = log_old_size + 1; |
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word old_size = ((log_old_size == -1)? 0: (1 << log_old_size)); |
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register word new_size = 1 << log_new_size; |
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struct hash_chain_entry **new_table = (struct hash_chain_entry **) |
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GC_INTERNAL_MALLOC_IGNORE_OFF_PAGE( |
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(size_t)new_size * sizeof(struct hash_chain_entry *), NORMAL); |
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if (new_table == 0) { |
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if (table == 0) { |
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ABORT("Insufficient space for initial table allocation"); |
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} else { |
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return; |
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}
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}
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for (i = 0; i < old_size; i++) { |
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p = (*table)[i]; |
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while (p != 0) { |
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register ptr_t real_key = (ptr_t)REVEAL_POINTER(p -> hidden_key); |
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register struct hash_chain_entry *next = p -> next; |
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register int new_hash = HASH3(real_key, new_size, log_new_size); |
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p -> next = new_table[new_hash]; |
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new_table[new_hash] = p; |
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p = next; |
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}
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}
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*log_size_ptr = log_new_size; |
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*table = new_table; |
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}
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# if defined(__STDC__) || defined(__cplusplus)
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int GC_register_disappearing_link(GC_PTR * link) |
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# else
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int GC_register_disappearing_link(link) |
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GC_PTR * link; |
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# endif
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{
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ptr_t base; |
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base = (ptr_t)GC_base((GC_PTR)link); |
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if (base == 0) |
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ABORT("Bad arg to GC_register_disappearing_link"); |
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return(GC_general_register_disappearing_link(link, base)); |
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}
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# if defined(__STDC__) || defined(__cplusplus)
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int GC_general_register_disappearing_link(GC_PTR * link, |
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GC_PTR obj) |
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# else
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int GC_general_register_disappearing_link(link, obj) |
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GC_PTR * link; |
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GC_PTR obj; |
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# endif
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{
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struct disappearing_link *curr_dl; |
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int index; |
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struct disappearing_link * new_dl; |
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DCL_LOCK_STATE; |
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if ((word)link & (ALIGNMENT-1)) |
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ABORT("Bad arg to GC_general_register_disappearing_link"); |
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# ifdef THREADS
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DISABLE_SIGNALS(); |
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LOCK(); |
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# endif
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if (log_dl_table_size == -1 |
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|| GC_dl_entries > ((word)1 << log_dl_table_size)) { |
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# ifndef THREADS
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DISABLE_SIGNALS(); |
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# endif
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GC_grow_table((struct hash_chain_entry ***)(&dl_head), |
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&log_dl_table_size); |
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# ifdef CONDPRINT
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if (GC_print_stats) { |
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GC_printf1("Grew dl table to %lu entries\n", |
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(unsigned long)(1 << log_dl_table_size)); |
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}
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# endif
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# ifndef THREADS
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ENABLE_SIGNALS(); |
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# endif
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}
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index = HASH2(link, log_dl_table_size); |
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curr_dl = dl_head[index]; |
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for (curr_dl = dl_head[index]; curr_dl != 0; curr_dl = dl_next(curr_dl)) { |
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if (curr_dl -> dl_hidden_link == HIDE_POINTER(link)) { |
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curr_dl -> dl_hidden_obj = HIDE_POINTER(obj); |
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# ifdef THREADS
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UNLOCK(); |
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ENABLE_SIGNALS(); |
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# endif
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return(1); |
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}
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}
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new_dl = (struct disappearing_link *) |
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GC_INTERNAL_MALLOC(sizeof(struct disappearing_link),NORMAL); |
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if (0 == new_dl) { |
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# ifdef THREADS
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UNLOCK(); |
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ENABLE_SIGNALS(); |
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# endif
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new_dl = (struct disappearing_link *) |
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GC_oom_fn(sizeof(struct disappearing_link)); |
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if (0 == new_dl) { |
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GC_finalization_failures++; |
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return(0); |
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}
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/* It's not likely we'll make it here, but ... */
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# ifdef THREADS
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DISABLE_SIGNALS(); |
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LOCK(); |
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# endif
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}
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new_dl -> dl_hidden_obj = HIDE_POINTER(obj); |
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new_dl -> dl_hidden_link = HIDE_POINTER(link); |
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dl_set_next(new_dl, dl_head[index]); |
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dl_head[index] = new_dl; |
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GC_dl_entries++; |
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# ifdef THREADS
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UNLOCK(); |
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ENABLE_SIGNALS(); |
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# endif
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return(0); |
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}
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# if defined(__STDC__) || defined(__cplusplus)
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int GC_unregister_disappearing_link(GC_PTR * link) |
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# else
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int GC_unregister_disappearing_link(link) |
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GC_PTR * link; |
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# endif
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{
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struct disappearing_link *curr_dl, *prev_dl; |
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int index; |
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DCL_LOCK_STATE; |
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DISABLE_SIGNALS(); |
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LOCK(); |
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index = HASH2(link, log_dl_table_size); |
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if (((unsigned long)link & (ALIGNMENT-1))) goto out; |
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prev_dl = 0; curr_dl = dl_head[index]; |
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while (curr_dl != 0) { |
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if (curr_dl -> dl_hidden_link == HIDE_POINTER(link)) { |
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if (prev_dl == 0) { |
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dl_head[index] = dl_next(curr_dl); |
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} else { |
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dl_set_next(prev_dl, dl_next(curr_dl)); |
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}
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GC_dl_entries--; |
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UNLOCK(); |
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ENABLE_SIGNALS(); |
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# ifdef DBG_HDRS_ALL
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dl_set_next(curr_dl, 0); |
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# else
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GC_free((GC_PTR)curr_dl); |
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# endif
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return(1); |
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}
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prev_dl = curr_dl; |
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curr_dl = dl_next(curr_dl); |
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}
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out: |
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UNLOCK(); |
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ENABLE_SIGNALS(); |
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return(0); |
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}
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/* Possible finalization_marker procedures. Note that mark stack */
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/* overflow is handled by the caller, and is not a disaster. */
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GC_API void GC_normal_finalize_mark_proc(p) |
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ptr_t p; |
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{
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hdr * hhdr = HDR(p); |
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PUSH_OBJ((word *)p, hhdr, GC_mark_stack_top, |
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&(GC_mark_stack[GC_mark_stack_size])); |
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}
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/* This only pays very partial attention to the mark descriptor. */
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/* It does the right thing for normal and atomic objects, and treats */
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/* most others as normal. */
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GC_API void GC_ignore_self_finalize_mark_proc(p) |
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ptr_t p; |
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{
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hdr * hhdr = HDR(p); |
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word descr = hhdr -> hb_descr; |
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ptr_t q, r; |
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ptr_t scan_limit; |
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ptr_t target_limit = p + WORDS_TO_BYTES(hhdr -> hb_sz) - 1; |
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if ((descr & GC_DS_TAGS) == GC_DS_LENGTH) { |
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scan_limit = p + descr - sizeof(word); |
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} else { |
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scan_limit = target_limit + 1 - sizeof(word); |
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}
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for (q = p; q <= scan_limit; q += ALIGNMENT) { |
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r = *(ptr_t *)q; |
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if (r < p || r > target_limit) { |
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GC_PUSH_ONE_HEAP((word)r, q); |
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}
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}
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}
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/*ARGSUSED*/
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GC_API void GC_null_finalize_mark_proc(p) |
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ptr_t p; |
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{
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}
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318 |
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319 |
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/* Register a finalization function. See gc.h for details. */
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/* in the nonthreads case, we try to avoid disabling signals, */
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/* since it can be expensive. Threads packages typically */
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/* make it cheaper. */
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/* The last parameter is a procedure that determines */
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/* marking for finalization ordering. Any objects marked */
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/* by that procedure will be guaranteed to not have been */
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/* finalized when this finalizer is invoked. */
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328 |
GC_API void GC_register_finalizer_inner(obj, fn, cd, ofn, ocd, mp) |
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GC_PTR obj; |
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330 |
GC_finalization_proc fn; |
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GC_PTR cd; |
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GC_finalization_proc * ofn; |
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GC_PTR * ocd; |
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finalization_mark_proc * mp; |
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{
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ptr_t base; |
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struct finalizable_object * curr_fo, * prev_fo; |
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int index; |
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struct finalizable_object *new_fo; |
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hdr *hhdr; |
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DCL_LOCK_STATE; |
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342 |
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343 |
# ifdef THREADS
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344 |
DISABLE_SIGNALS(); |
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345 |
LOCK(); |
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346 |
# endif
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347 |
if (log_fo_table_size == -1 |
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348 |
|| GC_fo_entries > ((word)1 << log_fo_table_size)) { |
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349 |
# ifndef THREADS
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350 |
DISABLE_SIGNALS(); |
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351 |
# endif
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352 |
GC_grow_table((struct hash_chain_entry ***)(&fo_head), |
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353 |
&log_fo_table_size); |
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354 |
# ifdef CONDPRINT
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355 |
if (GC_print_stats) { |
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356 |
GC_printf1("Grew fo table to %lu entries\n", |
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357 |
(unsigned long)(1 << log_fo_table_size)); |
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358 |
}
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359 |
# endif
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360 |
# ifndef THREADS
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361 |
ENABLE_SIGNALS(); |
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362 |
# endif
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363 |
}
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364 |
/* in the THREADS case signals are disabled and we hold allocation */
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365 |
/* lock; otherwise neither is true. Proceed carefully. */
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366 |
base = (ptr_t)obj; |
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367 |
index = HASH2(base, log_fo_table_size); |
|
368 |
prev_fo = 0; curr_fo = fo_head[index]; |
|
369 |
while (curr_fo != 0) { |
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370 |
if (curr_fo -> fo_hidden_base == HIDE_POINTER(base)) { |
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371 |
/* Interruption by a signal in the middle of this */
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372 |
/* should be safe. The client may see only *ocd */
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373 |
/* updated, but we'll declare that to be his */
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374 |
/* problem. */
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375 |
if (ocd) *ocd = (GC_PTR) curr_fo -> fo_client_data; |
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376 |
if (ofn) *ofn = curr_fo -> fo_fn; |
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377 |
/* Delete the structure for base. */
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378 |
if (prev_fo == 0) { |
|
379 |
fo_head[index] = fo_next(curr_fo); |
|
380 |
} else { |
|
381 |
fo_set_next(prev_fo, fo_next(curr_fo)); |
|
382 |
}
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383 |
if (fn == 0) { |
|
384 |
GC_fo_entries--; |
|
385 |
/* May not happen if we get a signal. But a high */
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|
386 |
/* estimate will only make the table larger than */
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|
387 |
/* necessary. */
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|
388 |
# if !defined(THREADS) && !defined(DBG_HDRS_ALL)
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|
389 |
GC_free((GC_PTR)curr_fo); |
|
390 |
# endif
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|
391 |
} else { |
|
392 |
curr_fo -> fo_fn = fn; |
|
393 |
curr_fo -> fo_client_data = (ptr_t)cd; |
|
394 |
curr_fo -> fo_mark_proc = mp; |
|
395 |
/* Reinsert it. We deleted it first to maintain */
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|
396 |
/* consistency in the event of a signal. */
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|
397 |
if (prev_fo == 0) { |
|
398 |
fo_head[index] = curr_fo; |
|
399 |
} else { |
|
400 |
fo_set_next(prev_fo, curr_fo); |
|
401 |
}
|
|
402 |
}
|
|
403 |
# ifdef THREADS
|
|
404 |
UNLOCK(); |
|
405 |
ENABLE_SIGNALS(); |
|
406 |
# endif
|
|
407 |
return; |
|
408 |
}
|
|
409 |
prev_fo = curr_fo; |
|
410 |
curr_fo = fo_next(curr_fo); |
|
411 |
}
|
|
412 |
if (ofn) *ofn = 0; |
|
413 |
if (ocd) *ocd = 0; |
|
414 |
if (fn == 0) { |
|
415 |
# ifdef THREADS
|
|
416 |
UNLOCK(); |
|
417 |
ENABLE_SIGNALS(); |
|
418 |
# endif
|
|
419 |
return; |
|
420 |
}
|
|
421 |
GET_HDR(base, hhdr); |
|
422 |
if (0 == hhdr) { |
|
423 |
/* We won't collect it, hence finalizer wouldn't be run. */
|
|
424 |
# ifdef THREADS
|
|
425 |
UNLOCK(); |
|
426 |
ENABLE_SIGNALS(); |
|
427 |
# endif
|
|
428 |
return; |
|
429 |
}
|
|
430 |
new_fo = (struct finalizable_object *) |
|
431 |
GC_INTERNAL_MALLOC(sizeof(struct finalizable_object),NORMAL); |
|
432 |
if (0 == new_fo) { |
|
433 |
# ifdef THREADS
|
|
434 |
UNLOCK(); |
|
435 |
ENABLE_SIGNALS(); |
|
436 |
# endif
|
|
437 |
new_fo = (struct finalizable_object *) |
|
438 |
GC_oom_fn(sizeof(struct finalizable_object)); |
|
439 |
if (0 == new_fo) { |
|
440 |
GC_finalization_failures++; |
|
441 |
return; |
|
442 |
}
|
|
443 |
/* It's not likely we'll make it here, but ... */
|
|
444 |
# ifdef THREADS
|
|
445 |
DISABLE_SIGNALS(); |
|
446 |
LOCK(); |
|
447 |
# endif
|
|
448 |
}
|
|
449 |
new_fo -> fo_hidden_base = (word)HIDE_POINTER(base); |
|
450 |
new_fo -> fo_fn = fn; |
|
451 |
new_fo -> fo_client_data = (ptr_t)cd; |
|
452 |
new_fo -> fo_object_size = hhdr -> hb_sz; |
|
453 |
new_fo -> fo_mark_proc = mp; |
|
454 |
fo_set_next(new_fo, fo_head[index]); |
|
455 |
GC_fo_entries++; |
|
456 |
fo_head[index] = new_fo; |
|
457 |
# ifdef THREADS
|
|
458 |
UNLOCK(); |
|
459 |
ENABLE_SIGNALS(); |
|
460 |
# endif
|
|
461 |
}
|
|
462 |
||
463 |
# if defined(__STDC__)
|
|
464 |
void GC_register_finalizer(void * obj, |
|
465 |
GC_finalization_proc fn, void * cd, |
|
466 |
GC_finalization_proc *ofn, void ** ocd) |
|
467 |
# else
|
|
468 |
void GC_register_finalizer(obj, fn, cd, ofn, ocd) |
|
469 |
GC_PTR obj; |
|
470 |
GC_finalization_proc fn; |
|
471 |
GC_PTR cd; |
|
472 |
GC_finalization_proc * ofn; |
|
473 |
GC_PTR * ocd; |
|
474 |
# endif
|
|
475 |
{
|
|
476 |
GC_register_finalizer_inner(obj, fn, cd, ofn, |
|
477 |
ocd, GC_normal_finalize_mark_proc); |
|
478 |
}
|
|
479 |
||
480 |
# if defined(__STDC__)
|
|
481 |
void GC_register_finalizer_ignore_self(void * obj, |
|
482 |
GC_finalization_proc fn, void * cd, |
|
483 |
GC_finalization_proc *ofn, void ** ocd) |
|
484 |
# else
|
|
485 |
void GC_register_finalizer_ignore_self(obj, fn, cd, ofn, ocd) |
|
486 |
GC_PTR obj; |
|
487 |
GC_finalization_proc fn; |
|
488 |
GC_PTR cd; |
|
489 |
GC_finalization_proc * ofn; |
|
490 |
GC_PTR * ocd; |
|
491 |
# endif
|
|
492 |
{
|
|
493 |
GC_register_finalizer_inner(obj, fn, cd, ofn, |
|
494 |
ocd, GC_ignore_self_finalize_mark_proc); |
|
495 |
}
|
|
496 |
||
497 |
# if defined(__STDC__)
|
|
498 |
void GC_register_finalizer_no_order(void * obj, |
|
499 |
GC_finalization_proc fn, void * cd, |
|
500 |
GC_finalization_proc *ofn, void ** ocd) |
|
501 |
# else
|
|
502 |
void GC_register_finalizer_no_order(obj, fn, cd, ofn, ocd) |
|
503 |
GC_PTR obj; |
|
504 |
GC_finalization_proc fn; |
|
505 |
GC_PTR cd; |
|
506 |
GC_finalization_proc * ofn; |
|
507 |
GC_PTR * ocd; |
|
508 |
# endif
|
|
509 |
{
|
|
510 |
GC_register_finalizer_inner(obj, fn, cd, ofn, |
|
511 |
ocd, GC_null_finalize_mark_proc); |
|
512 |
}
|
|
513 |
||
514 |
#ifndef NO_DEBUGGING
|
|
515 |
void GC_dump_finalization() |
|
516 |
{
|
|
517 |
struct disappearing_link * curr_dl; |
|
518 |
struct finalizable_object * curr_fo; |
|
519 |
ptr_t real_ptr, real_link; |
|
520 |
int dl_size = (log_dl_table_size == -1 ) ? 0 : (1 << log_dl_table_size); |
|
521 |
int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size); |
|
522 |
int i; |
|
523 |
||
524 |
GC_printf0("Disappearing links:\n"); |
|
525 |
for (i = 0; i < dl_size; i++) { |
|
526 |
for (curr_dl = dl_head[i]; curr_dl != 0; curr_dl = dl_next(curr_dl)) { |
|
527 |
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj); |
|
528 |
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link); |
|
529 |
GC_printf2("Object: 0x%lx, Link:0x%lx\n", real_ptr, real_link); |
|
530 |
}
|
|
531 |
}
|
|
532 |
GC_printf0("Finalizers:\n"); |
|
533 |
for (i = 0; i < fo_size; i++) { |
|
534 |
for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) { |
|
535 |
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base); |
|
536 |
GC_printf1("Finalizable object: 0x%lx\n", real_ptr); |
|
537 |
}
|
|
538 |
}
|
|
539 |
}
|
|
540 |
#endif
|
|
541 |
||
542 |
/* Called with world stopped. Cause disappearing links to disappear, */
|
|
543 |
/* and invoke finalizers. */
|
|
544 |
void GC_finalize() |
|
545 |
{
|
|
546 |
struct disappearing_link * curr_dl, * prev_dl, * next_dl; |
|
547 |
struct finalizable_object * curr_fo, * prev_fo, * next_fo; |
|
548 |
ptr_t real_ptr, real_link; |
|
549 |
register int i; |
|
550 |
int dl_size = (log_dl_table_size == -1 ) ? 0 : (1 << log_dl_table_size); |
|
551 |
int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size); |
|
552 |
||
553 |
/* Make disappearing links disappear */
|
|
554 |
for (i = 0; i < dl_size; i++) { |
|
555 |
curr_dl = dl_head[i]; |
|
556 |
prev_dl = 0; |
|
557 |
while (curr_dl != 0) { |
|
558 |
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj); |
|
559 |
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link); |
|
560 |
if (!GC_is_marked(real_ptr)) { |
|
561 |
*(word *)real_link = 0; |
|
562 |
next_dl = dl_next(curr_dl); |
|
563 |
if (prev_dl == 0) { |
|
564 |
dl_head[i] = next_dl; |
|
565 |
} else { |
|
566 |
dl_set_next(prev_dl, next_dl); |
|
567 |
}
|
|
568 |
GC_clear_mark_bit((ptr_t)curr_dl); |
|
569 |
GC_dl_entries--; |
|
570 |
curr_dl = next_dl; |
|
571 |
} else { |
|
572 |
prev_dl = curr_dl; |
|
573 |
curr_dl = dl_next(curr_dl); |
|
574 |
}
|
|
575 |
}
|
|
576 |
}
|
|
577 |
/* Mark all objects reachable via chains of 1 or more pointers */
|
|
578 |
/* from finalizable objects. */
|
|
579 |
GC_ASSERT(GC_mark_state == MS_NONE); |
|
580 |
for (i = 0; i < fo_size; i++) { |
|
581 |
for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) { |
|
582 |
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base); |
|
583 |
if (!GC_is_marked(real_ptr)) { |
|
584 |
GC_MARKED_FOR_FINALIZATION(real_ptr); |
|
585 |
GC_MARK_FO(real_ptr, curr_fo -> fo_mark_proc); |
|
586 |
if (GC_is_marked(real_ptr)) { |
|
587 |
WARN("Finalization cycle involving %lx\n", real_ptr); |
|
588 |
}
|
|
589 |
}
|
|
590 |
}
|
|
591 |
}
|
|
592 |
/* Enqueue for finalization all objects that are still */
|
|
593 |
/* unreachable. */
|
|
594 |
GC_words_finalized = 0; |
|
595 |
for (i = 0; i < fo_size; i++) { |
|
596 |
curr_fo = fo_head[i]; |
|
597 |
prev_fo = 0; |
|
598 |
while (curr_fo != 0) { |
|
599 |
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base); |
|
600 |
if (!GC_is_marked(real_ptr)) { |
|
601 |
if (!GC_java_finalization) { |
|
602 |
GC_set_mark_bit(real_ptr); |
|
603 |
}
|
|
604 |
/* Delete from hash table */
|
|
605 |
next_fo = fo_next(curr_fo); |
|
606 |
if (prev_fo == 0) { |
|
607 |
fo_head[i] = next_fo; |
|
608 |
} else { |
|
609 |
fo_set_next(prev_fo, next_fo); |
|
610 |
}
|
|
611 |
GC_fo_entries--; |
|
612 |
/* Add to list of objects awaiting finalization. */
|
|
613 |
fo_set_next(curr_fo, GC_finalize_now); |
|
614 |
GC_finalize_now = curr_fo; |
|
615 |
/* unhide object pointer so any future collections will */
|
|
616 |
/* see it. */
|
|
617 |
curr_fo -> fo_hidden_base = |
|
618 |
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base); |
|
619 |
GC_words_finalized += |
|
620 |
ALIGNED_WORDS(curr_fo -> fo_object_size) |
|
621 |
+ ALIGNED_WORDS(sizeof(struct finalizable_object)); |
|
622 |
GC_ASSERT(GC_is_marked(GC_base((ptr_t)curr_fo))); |
|
623 |
curr_fo = next_fo; |
|
624 |
} else { |
|
625 |
prev_fo = curr_fo; |
|
626 |
curr_fo = fo_next(curr_fo); |
|
627 |
}
|
|
628 |
}
|
|
629 |
}
|
|
630 |
||
631 |
if (GC_java_finalization) { |
|
632 |
/* make sure we mark everything reachable from objects finalized
|
|
633 |
using the no_order mark_proc */
|
|
634 |
for (curr_fo = GC_finalize_now; |
|
635 |
curr_fo != NULL; curr_fo = fo_next(curr_fo)) { |
|
636 |
real_ptr = (ptr_t)curr_fo -> fo_hidden_base; |
|
637 |
if (!GC_is_marked(real_ptr)) { |
|
638 |
if (curr_fo -> fo_mark_proc == GC_null_finalize_mark_proc) { |
|
639 |
GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc); |
|
640 |
}
|
|
641 |
GC_set_mark_bit(real_ptr); |
|
642 |
}
|
|
643 |
}
|
|
644 |
}
|
|
645 |
||
646 |
/* Remove dangling disappearing links. */
|
|
647 |
for (i = 0; i < dl_size; i++) { |
|
648 |
curr_dl = dl_head[i]; |
|
649 |
prev_dl = 0; |
|
650 |
while (curr_dl != 0) { |
|
651 |
real_link = GC_base((ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link)); |
|
652 |
if (real_link != 0 && !GC_is_marked(real_link)) { |
|
653 |
next_dl = dl_next(curr_dl); |
|
654 |
if (prev_dl == 0) { |
|
655 |
dl_head[i] = next_dl; |
|
656 |
} else { |
|
657 |
dl_set_next(prev_dl, next_dl); |
|
658 |
}
|
|
659 |
GC_clear_mark_bit((ptr_t)curr_dl); |
|
660 |
GC_dl_entries--; |
|
661 |
curr_dl = next_dl; |
|
662 |
} else { |
|
663 |
prev_dl = curr_dl; |
|
664 |
curr_dl = dl_next(curr_dl); |
|
665 |
}
|
|
666 |
}
|
|
667 |
}
|
|
668 |
}
|
|
669 |
||
670 |
#ifndef JAVA_FINALIZATION_NOT_NEEDED
|
|
671 |
||
672 |
/* Enqueue all remaining finalizers to be run - Assumes lock is
|
|
673 |
* held, and signals are disabled */
|
|
674 |
void GC_enqueue_all_finalizers() |
|
675 |
{
|
|
676 |
struct finalizable_object * curr_fo, * prev_fo, * next_fo; |
|
677 |
ptr_t real_ptr; |
|
678 |
register int i; |
|
679 |
int fo_size; |
|
680 |
||
681 |
fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size); |
|
682 |
GC_words_finalized = 0; |
|
683 |
for (i = 0; i < fo_size; i++) { |
|
684 |
curr_fo = fo_head[i]; |
|
685 |
prev_fo = 0; |
|
686 |
while (curr_fo != 0) { |
|
687 |
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base); |
|
688 |
GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc); |
|
689 |
GC_set_mark_bit(real_ptr); |
|
690 |
||
691 |
/* Delete from hash table */
|
|
692 |
next_fo = fo_next(curr_fo); |
|
693 |
if (prev_fo == 0) { |
|
694 |
fo_head[i] = next_fo; |
|
695 |
} else { |
|
696 |
fo_set_next(prev_fo, next_fo); |
|
697 |
}
|
|
698 |
GC_fo_entries--; |
|
699 |
||
700 |
/* Add to list of objects awaiting finalization. */
|
|
701 |
fo_set_next(curr_fo, GC_finalize_now); |
|
702 |
GC_finalize_now = curr_fo; |
|
703 |
||
704 |
/* unhide object pointer so any future collections will */
|
|
705 |
/* see it. */
|
|
706 |
curr_fo -> fo_hidden_base = |
|
707 |
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base); |
|
708 |
||
709 |
GC_words_finalized += |
|
710 |
ALIGNED_WORDS(curr_fo -> fo_object_size) |
|
711 |
+ ALIGNED_WORDS(sizeof(struct finalizable_object)); |
|
712 |
curr_fo = next_fo; |
|
713 |
}
|
|
714 |
}
|
|
715 |
||
716 |
return; |
|
717 |
}
|
|
718 |
||
719 |
/* Invoke all remaining finalizers that haven't yet been run.
|
|
720 |
* This is needed for strict compliance with the Java standard,
|
|
721 |
* which can make the runtime guarantee that all finalizers are run.
|
|
722 |
* Unfortunately, the Java standard implies we have to keep running
|
|
723 |
* finalizers until there are no more left, a potential infinite loop.
|
|
724 |
* YUCK.
|
|
725 |
* Note that this is even more dangerous than the usual Java
|
|
726 |
* finalizers, in that objects reachable from static variables
|
|
727 |
* may have been finalized when these finalizers are run.
|
|
728 |
* Finalizers run at this point must be prepared to deal with a
|
|
729 |
* mostly broken world.
|
|
730 |
* This routine is externally callable, so is called without
|
|
731 |
* the allocation lock.
|
|
732 |
*/
|
|
733 |
GC_API void GC_finalize_all() |
|
734 |
{
|
|
735 |
DCL_LOCK_STATE; |
|
736 |
||
737 |
DISABLE_SIGNALS(); |
|
738 |
LOCK(); |
|
739 |
while (GC_fo_entries > 0) { |
|
740 |
GC_enqueue_all_finalizers(); |
|
741 |
UNLOCK(); |
|
742 |
ENABLE_SIGNALS(); |
|
743 |
GC_INVOKE_FINALIZERS(); |
|
744 |
DISABLE_SIGNALS(); |
|
745 |
LOCK(); |
|
746 |
}
|
|
747 |
UNLOCK(); |
|
748 |
ENABLE_SIGNALS(); |
|
749 |
}
|
|
750 |
#endif
|
|
751 |
||
752 |
/* Returns true if it is worth calling GC_invoke_finalizers. (Useful if */
|
|
753 |
/* finalizers can only be called from some kind of `safe state' and */
|
|
754 |
/* getting into that safe state is expensive.) */
|
|
755 |
int GC_should_invoke_finalizers GC_PROTO((void)) |
|
756 |
{
|
|
757 |
return GC_finalize_now != 0; |
|
758 |
}
|
|
759 |
||
760 |
/* Invoke finalizers for all objects that are ready to be finalized. */
|
|
761 |
/* Should be called without allocation lock. */
|
|
762 |
int GC_invoke_finalizers() |
|
763 |
{
|
|
1.1.1
by Ryan Murray
Import upstream version 6.2+6.3alpha4 |
764 |
struct finalizable_object * curr_fo; |
765 |
int count = 0; |
|
766 |
word mem_freed_before; |
|
1
by Ryan Murray
Import upstream version 6.0+6.1alpha4 |
767 |
DCL_LOCK_STATE; |
768 |
||
769 |
while (GC_finalize_now != 0) { |
|
770 |
# ifdef THREADS
|
|
771 |
DISABLE_SIGNALS(); |
|
772 |
LOCK(); |
|
773 |
# endif
|
|
1.1.1
by Ryan Murray
Import upstream version 6.2+6.3alpha4 |
774 |
if (count == 0) { |
775 |
mem_freed_before = GC_mem_freed; |
|
776 |
}
|
|
1
by Ryan Murray
Import upstream version 6.0+6.1alpha4 |
777 |
curr_fo = GC_finalize_now; |
778 |
# ifdef THREADS
|
|
779 |
if (curr_fo != 0) GC_finalize_now = fo_next(curr_fo); |
|
780 |
UNLOCK(); |
|
781 |
ENABLE_SIGNALS(); |
|
782 |
if (curr_fo == 0) break; |
|
783 |
# else
|
|
784 |
GC_finalize_now = fo_next(curr_fo); |
|
785 |
# endif
|
|
786 |
fo_set_next(curr_fo, 0); |
|
787 |
(*(curr_fo -> fo_fn))((ptr_t)(curr_fo -> fo_hidden_base), |
|
788 |
curr_fo -> fo_client_data); |
|
789 |
curr_fo -> fo_client_data = 0; |
|
790 |
++count; |
|
791 |
# ifdef UNDEFINED
|
|
792 |
/* This is probably a bad idea. It throws off accounting if */
|
|
793 |
/* nearly all objects are finalizable. O.w. it shouldn't */
|
|
794 |
/* matter. */
|
|
795 |
GC_free((GC_PTR)curr_fo); |
|
796 |
# endif
|
|
797 |
}
|
|
1.1.1
by Ryan Murray
Import upstream version 6.2+6.3alpha4 |
798 |
if (count != 0 && mem_freed_before != GC_mem_freed) { |
799 |
LOCK(); |
|
800 |
GC_finalizer_mem_freed += (GC_mem_freed - mem_freed_before); |
|
801 |
UNLOCK(); |
|
802 |
}
|
|
1
by Ryan Murray
Import upstream version 6.0+6.1alpha4 |
803 |
return count; |
804 |
}
|
|
805 |
||
806 |
void (* GC_finalizer_notifier)() = (void (*) GC_PROTO((void)))0; |
|
807 |
||
808 |
static GC_word last_finalizer_notification = 0; |
|
809 |
||
810 |
void GC_notify_or_invoke_finalizers GC_PROTO((void)) |
|
811 |
{
|
|
1.1.2
by Ryan Murray
Import upstream version 6.3 |
812 |
/* This is a convenient place to generate backtraces if appropriate, */
|
813 |
/* since that code is not callable with the allocation lock. */
|
|
1.2.1
by Ryan Murray
Import upstream version 6.4 |
814 |
# if defined(KEEP_BACK_PTRS) || defined(MAKE_BACK_GRAPH)
|
815 |
static word last_back_trace_gc_no = 1; /* Skip first one. */ |
|
816 |
||
817 |
if (GC_gc_no > last_back_trace_gc_no) { |
|
818 |
word i; |
|
819 |
||
820 |
# ifdef KEEP_BACK_PTRS
|
|
821 |
LOCK(); |
|
1.1.2
by Ryan Murray
Import upstream version 6.3 |
822 |
/* Stops when GC_gc_no wraps; that's OK. */
|
1.2.1
by Ryan Murray
Import upstream version 6.4 |
823 |
last_back_trace_gc_no = (word)(-1); /* disable others. */ |
824 |
for (i = 0; i < GC_backtraces; ++i) { |
|
1.1.2
by Ryan Murray
Import upstream version 6.3 |
825 |
/* FIXME: This tolerates concurrent heap mutation, */
|
826 |
/* which may cause occasional mysterious results. */
|
|
827 |
/* We need to release the GC lock, since GC_print_callers */
|
|
828 |
/* acquires it. It probably shouldn't. */
|
|
829 |
UNLOCK(); |
|
830 |
GC_generate_random_backtrace_no_gc(); |
|
831 |
LOCK(); |
|
1.2.1
by Ryan Murray
Import upstream version 6.4 |
832 |
}
|
833 |
last_back_trace_gc_no = GC_gc_no; |
|
834 |
UNLOCK(); |
|
835 |
# endif
|
|
836 |
# ifdef MAKE_BACK_GRAPH
|
|
837 |
if (GC_print_back_height) |
|
838 |
GC_print_back_graph_stats(); |
|
839 |
# endif
|
|
1.1.2
by Ryan Murray
Import upstream version 6.3 |
840 |
}
|
841 |
# endif
|
|
1
by Ryan Murray
Import upstream version 6.0+6.1alpha4 |
842 |
if (GC_finalize_now == 0) return; |
843 |
if (!GC_finalize_on_demand) { |
|
844 |
(void) GC_invoke_finalizers(); |
|
1.1.1
by Ryan Murray
Import upstream version 6.2+6.3alpha4 |
845 |
# ifndef THREADS
|
846 |
GC_ASSERT(GC_finalize_now == 0); |
|
847 |
# endif /* Otherwise GC can run concurrently and add more */ |
|
1
by Ryan Murray
Import upstream version 6.0+6.1alpha4 |
848 |
return; |
849 |
}
|
|
850 |
if (GC_finalizer_notifier != (void (*) GC_PROTO((void)))0 |
|
851 |
&& last_finalizer_notification != GC_gc_no) { |
|
852 |
last_finalizer_notification = GC_gc_no; |
|
853 |
GC_finalizer_notifier(); |
|
854 |
}
|
|
855 |
}
|
|
856 |
||
857 |
# ifdef __STDC__
|
|
858 |
GC_PTR GC_call_with_alloc_lock(GC_fn_type fn, |
|
859 |
GC_PTR client_data) |
|
860 |
# else
|
|
861 |
GC_PTR GC_call_with_alloc_lock(fn, client_data) |
|
862 |
GC_fn_type fn; |
|
863 |
GC_PTR client_data; |
|
864 |
# endif
|
|
865 |
{
|
|
866 |
GC_PTR result; |
|
867 |
DCL_LOCK_STATE; |
|
868 |
||
869 |
# ifdef THREADS
|
|
870 |
DISABLE_SIGNALS(); |
|
871 |
LOCK(); |
|
872 |
SET_LOCK_HOLDER(); |
|
873 |
# endif
|
|
874 |
result = (*fn)(client_data); |
|
875 |
# ifdef THREADS
|
|
876 |
# ifndef GC_ASSERTIONS
|
|
877 |
UNSET_LOCK_HOLDER(); |
|
878 |
# endif /* o.w. UNLOCK() does it implicitly */ |
|
879 |
UNLOCK(); |
|
880 |
ENABLE_SIGNALS(); |
|
881 |
# endif
|
|
882 |
return(result); |
|
883 |
}
|
|
884 |
||
1.1.1
by Ryan Murray
Import upstream version 6.2+6.3alpha4 |
885 |
#if !defined(NO_DEBUGGING)
|
886 |
||
887 |
void GC_print_finalization_stats() |
|
888 |
{
|
|
889 |
struct finalizable_object *fo = GC_finalize_now; |
|
890 |
size_t ready = 0; |
|
891 |
||
892 |
GC_printf2("%lu finalization table entries; %lu disappearing links\n", |
|
893 |
GC_fo_entries, GC_dl_entries); |
|
894 |
for (; 0 != fo; fo = fo_next(fo)) ++ready; |
|
895 |
GC_printf1("%lu objects are eligible for immediate finalization\n", ready); |
|
896 |
}
|
|
897 |
||
898 |
#endif /* NO_DEBUGGING */ |