855 lines
25 KiB
C
855 lines
25 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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* 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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/* 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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GC_API void GC_register_finalizer_inner(obj, fn, cd, ofn, ocd, mp)
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GC_PTR obj;
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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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# ifdef THREADS
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DISABLE_SIGNALS();
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LOCK();
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# endif
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if (log_fo_table_size == -1
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|| GC_fo_entries > ((word)1 << log_fo_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 ***)(&fo_head),
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&log_fo_table_size);
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# ifdef CONDPRINT
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if (GC_print_stats) {
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GC_printf1("Grew fo table to %lu entries\n",
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(unsigned long)(1 << log_fo_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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/* in the THREADS case signals are disabled and we hold allocation */
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/* lock; otherwise neither is true. Proceed carefully. */
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base = (ptr_t)obj;
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index = HASH2(base, log_fo_table_size);
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prev_fo = 0; curr_fo = fo_head[index];
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while (curr_fo != 0) {
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if (curr_fo -> fo_hidden_base == HIDE_POINTER(base)) {
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/* Interruption by a signal in the middle of this */
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/* should be safe. The client may see only *ocd */
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/* updated, but we'll declare that to be his */
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/* problem. */
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if (ocd) *ocd = (GC_PTR) curr_fo -> fo_client_data;
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if (ofn) *ofn = curr_fo -> fo_fn;
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/* Delete the structure for base. */
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if (prev_fo == 0) {
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fo_head[index] = fo_next(curr_fo);
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} else {
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fo_set_next(prev_fo, fo_next(curr_fo));
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}
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if (fn == 0) {
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GC_fo_entries--;
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/* May not happen if we get a signal. But a high */
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/* estimate will only make the table larger than */
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/* necessary. */
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# if !defined(THREADS) && !defined(DBG_HDRS_ALL)
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GC_free((GC_PTR)curr_fo);
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# endif
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} else {
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curr_fo -> fo_fn = fn;
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curr_fo -> fo_client_data = (ptr_t)cd;
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curr_fo -> fo_mark_proc = mp;
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/* Reinsert it. We deleted it first to maintain */
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/* consistency in the event of a signal. */
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if (prev_fo == 0) {
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fo_head[index] = curr_fo;
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} else {
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fo_set_next(prev_fo, curr_fo);
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}
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}
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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;
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}
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prev_fo = curr_fo;
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curr_fo = fo_next(curr_fo);
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}
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if (ofn) *ofn = 0;
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if (ocd) *ocd = 0;
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if (fn == 0) {
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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;
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}
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GET_HDR(base, hhdr);
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if (0 == hhdr) {
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/* We won't collect it, hence finalizer wouldn't be run. */
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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;
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}
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new_fo = (struct finalizable_object *)
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GC_INTERNAL_MALLOC(sizeof(struct finalizable_object),NORMAL);
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if (0 == new_fo) {
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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_fo = (struct finalizable_object *)
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GC_oom_fn(sizeof(struct finalizable_object));
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if (0 == new_fo) {
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GC_finalization_failures++;
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return;
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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_fo -> fo_hidden_base = (word)HIDE_POINTER(base);
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new_fo -> fo_fn = fn;
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new_fo -> fo_client_data = (ptr_t)cd;
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new_fo -> fo_object_size = hhdr -> hb_sz;
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new_fo -> fo_mark_proc = mp;
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fo_set_next(new_fo, fo_head[index]);
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GC_fo_entries++;
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fo_head[index] = new_fo;
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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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}
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# if defined(__STDC__)
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void GC_register_finalizer(void * obj,
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GC_finalization_proc fn, void * cd,
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GC_finalization_proc *ofn, void ** ocd)
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# else
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void GC_register_finalizer(obj, fn, cd, ofn, ocd)
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GC_PTR obj;
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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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# endif
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{
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GC_register_finalizer_inner(obj, fn, cd, ofn,
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ocd, GC_normal_finalize_mark_proc);
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}
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# if defined(__STDC__)
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void GC_register_finalizer_ignore_self(void * obj,
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GC_finalization_proc fn, void * cd,
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GC_finalization_proc *ofn, void ** ocd)
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# else
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void GC_register_finalizer_ignore_self(obj, fn, cd, ofn, ocd)
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GC_PTR obj;
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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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# endif
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{
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GC_register_finalizer_inner(obj, fn, cd, ofn,
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ocd, GC_ignore_self_finalize_mark_proc);
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}
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|
|
|
# if defined(__STDC__)
|
|
void GC_register_finalizer_no_order(void * obj,
|
|
GC_finalization_proc fn, void * cd,
|
|
GC_finalization_proc *ofn, void ** ocd)
|
|
# else
|
|
void GC_register_finalizer_no_order(obj, fn, cd, ofn, ocd)
|
|
GC_PTR obj;
|
|
GC_finalization_proc fn;
|
|
GC_PTR cd;
|
|
GC_finalization_proc * ofn;
|
|
GC_PTR * ocd;
|
|
# endif
|
|
{
|
|
GC_register_finalizer_inner(obj, fn, cd, ofn,
|
|
ocd, GC_null_finalize_mark_proc);
|
|
}
|
|
|
|
#ifndef NO_DEBUGGING
|
|
void GC_dump_finalization()
|
|
{
|
|
struct disappearing_link * curr_dl;
|
|
struct finalizable_object * curr_fo;
|
|
ptr_t real_ptr, real_link;
|
|
int dl_size = (log_dl_table_size == -1 ) ? 0 : (1 << log_dl_table_size);
|
|
int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
|
|
int i;
|
|
|
|
GC_printf0("Disappearing links:\n");
|
|
for (i = 0; i < dl_size; i++) {
|
|
for (curr_dl = dl_head[i]; curr_dl != 0; curr_dl = dl_next(curr_dl)) {
|
|
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
|
|
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
|
|
GC_printf2("Object: 0x%lx, Link:0x%lx\n", real_ptr, real_link);
|
|
}
|
|
}
|
|
GC_printf0("Finalizers:\n");
|
|
for (i = 0; i < fo_size; i++) {
|
|
for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) {
|
|
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
|
|
GC_printf1("Finalizable object: 0x%lx\n", real_ptr);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Called with world stopped. Cause disappearing links to disappear, */
|
|
/* and invoke finalizers. */
|
|
void GC_finalize()
|
|
{
|
|
struct disappearing_link * curr_dl, * prev_dl, * next_dl;
|
|
struct finalizable_object * curr_fo, * prev_fo, * next_fo;
|
|
ptr_t real_ptr, real_link;
|
|
register int i;
|
|
int dl_size = (log_dl_table_size == -1 ) ? 0 : (1 << log_dl_table_size);
|
|
int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
|
|
|
|
/* Make disappearing links disappear */
|
|
for (i = 0; i < dl_size; i++) {
|
|
curr_dl = dl_head[i];
|
|
prev_dl = 0;
|
|
while (curr_dl != 0) {
|
|
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
|
|
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
|
|
if (!GC_is_marked(real_ptr)) {
|
|
*(word *)real_link = 0;
|
|
next_dl = dl_next(curr_dl);
|
|
if (prev_dl == 0) {
|
|
dl_head[i] = next_dl;
|
|
} else {
|
|
dl_set_next(prev_dl, next_dl);
|
|
}
|
|
GC_clear_mark_bit((ptr_t)curr_dl);
|
|
GC_dl_entries--;
|
|
curr_dl = next_dl;
|
|
} else {
|
|
prev_dl = curr_dl;
|
|
curr_dl = dl_next(curr_dl);
|
|
}
|
|
}
|
|
}
|
|
/* Mark all objects reachable via chains of 1 or more pointers */
|
|
/* from finalizable objects. */
|
|
GC_ASSERT(GC_mark_state == MS_NONE);
|
|
for (i = 0; i < fo_size; i++) {
|
|
for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) {
|
|
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
|
|
if (!GC_is_marked(real_ptr)) {
|
|
GC_MARKED_FOR_FINALIZATION(real_ptr);
|
|
GC_MARK_FO(real_ptr, curr_fo -> fo_mark_proc);
|
|
if (GC_is_marked(real_ptr)) {
|
|
WARN("Finalization cycle involving %lx\n", real_ptr);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* Enqueue for finalization all objects that are still */
|
|
/* unreachable. */
|
|
GC_words_finalized = 0;
|
|
for (i = 0; i < fo_size; i++) {
|
|
curr_fo = fo_head[i];
|
|
prev_fo = 0;
|
|
while (curr_fo != 0) {
|
|
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
|
|
if (!GC_is_marked(real_ptr)) {
|
|
if (!GC_java_finalization) {
|
|
GC_set_mark_bit(real_ptr);
|
|
}
|
|
/* Delete from hash table */
|
|
next_fo = fo_next(curr_fo);
|
|
if (prev_fo == 0) {
|
|
fo_head[i] = next_fo;
|
|
} else {
|
|
fo_set_next(prev_fo, next_fo);
|
|
}
|
|
GC_fo_entries--;
|
|
/* Add to list of objects awaiting finalization. */
|
|
fo_set_next(curr_fo, GC_finalize_now);
|
|
GC_finalize_now = curr_fo;
|
|
/* unhide object pointer so any future collections will */
|
|
/* see it. */
|
|
curr_fo -> fo_hidden_base =
|
|
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
|
|
GC_words_finalized +=
|
|
ALIGNED_WORDS(curr_fo -> fo_object_size)
|
|
+ ALIGNED_WORDS(sizeof(struct finalizable_object));
|
|
GC_ASSERT(GC_is_marked(GC_base((ptr_t)curr_fo)));
|
|
curr_fo = next_fo;
|
|
} else {
|
|
prev_fo = curr_fo;
|
|
curr_fo = fo_next(curr_fo);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (GC_java_finalization) {
|
|
/* make sure we mark everything reachable from objects finalized
|
|
using the no_order mark_proc */
|
|
for (curr_fo = GC_finalize_now;
|
|
curr_fo != NULL; curr_fo = fo_next(curr_fo)) {
|
|
real_ptr = (ptr_t)curr_fo -> fo_hidden_base;
|
|
if (!GC_is_marked(real_ptr)) {
|
|
if (curr_fo -> fo_mark_proc == GC_null_finalize_mark_proc) {
|
|
GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc);
|
|
}
|
|
GC_set_mark_bit(real_ptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Remove dangling disappearing links. */
|
|
for (i = 0; i < dl_size; i++) {
|
|
curr_dl = dl_head[i];
|
|
prev_dl = 0;
|
|
while (curr_dl != 0) {
|
|
real_link = GC_base((ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link));
|
|
if (real_link != 0 && !GC_is_marked(real_link)) {
|
|
next_dl = dl_next(curr_dl);
|
|
if (prev_dl == 0) {
|
|
dl_head[i] = next_dl;
|
|
} else {
|
|
dl_set_next(prev_dl, next_dl);
|
|
}
|
|
GC_clear_mark_bit((ptr_t)curr_dl);
|
|
GC_dl_entries--;
|
|
curr_dl = next_dl;
|
|
} else {
|
|
prev_dl = curr_dl;
|
|
curr_dl = dl_next(curr_dl);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifndef JAVA_FINALIZATION_NOT_NEEDED
|
|
|
|
/* Enqueue all remaining finalizers to be run - Assumes lock is
|
|
* held, and signals are disabled */
|
|
void GC_enqueue_all_finalizers()
|
|
{
|
|
struct finalizable_object * curr_fo, * prev_fo, * next_fo;
|
|
ptr_t real_ptr;
|
|
register int i;
|
|
int fo_size;
|
|
|
|
fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
|
|
GC_words_finalized = 0;
|
|
for (i = 0; i < fo_size; i++) {
|
|
curr_fo = fo_head[i];
|
|
prev_fo = 0;
|
|
while (curr_fo != 0) {
|
|
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
|
|
GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc);
|
|
GC_set_mark_bit(real_ptr);
|
|
|
|
/* Delete from hash table */
|
|
next_fo = fo_next(curr_fo);
|
|
if (prev_fo == 0) {
|
|
fo_head[i] = next_fo;
|
|
} else {
|
|
fo_set_next(prev_fo, next_fo);
|
|
}
|
|
GC_fo_entries--;
|
|
|
|
/* Add to list of objects awaiting finalization. */
|
|
fo_set_next(curr_fo, GC_finalize_now);
|
|
GC_finalize_now = curr_fo;
|
|
|
|
/* unhide object pointer so any future collections will */
|
|
/* see it. */
|
|
curr_fo -> fo_hidden_base =
|
|
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
|
|
|
|
GC_words_finalized +=
|
|
ALIGNED_WORDS(curr_fo -> fo_object_size)
|
|
+ ALIGNED_WORDS(sizeof(struct finalizable_object));
|
|
curr_fo = next_fo;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/* Invoke all remaining finalizers that haven't yet been run.
|
|
* This is needed for strict compliance with the Java standard,
|
|
* which can make the runtime guarantee that all finalizers are run.
|
|
* Unfortunately, the Java standard implies we have to keep running
|
|
* finalizers until there are no more left, a potential infinite loop.
|
|
* YUCK.
|
|
* Note that this is even more dangerous than the usual Java
|
|
* finalizers, in that objects reachable from static variables
|
|
* may have been finalized when these finalizers are run.
|
|
* Finalizers run at this point must be prepared to deal with a
|
|
* mostly broken world.
|
|
* This routine is externally callable, so is called without
|
|
* the allocation lock.
|
|
*/
|
|
GC_API void GC_finalize_all()
|
|
{
|
|
DCL_LOCK_STATE;
|
|
|
|
DISABLE_SIGNALS();
|
|
LOCK();
|
|
while (GC_fo_entries > 0) {
|
|
GC_enqueue_all_finalizers();
|
|
UNLOCK();
|
|
ENABLE_SIGNALS();
|
|
GC_INVOKE_FINALIZERS();
|
|
DISABLE_SIGNALS();
|
|
LOCK();
|
|
}
|
|
UNLOCK();
|
|
ENABLE_SIGNALS();
|
|
}
|
|
#endif
|
|
|
|
/* Returns true if it is worth calling GC_invoke_finalizers. (Useful if */
|
|
/* finalizers can only be called from some kind of `safe state' and */
|
|
/* getting into that safe state is expensive.) */
|
|
int GC_should_invoke_finalizers GC_PROTO((void))
|
|
{
|
|
return GC_finalize_now != 0;
|
|
}
|
|
|
|
/* Invoke finalizers for all objects that are ready to be finalized. */
|
|
/* Should be called without allocation lock. */
|
|
int GC_invoke_finalizers()
|
|
{
|
|
struct finalizable_object * curr_fo;
|
|
int count = 0;
|
|
word mem_freed_before;
|
|
GC_bool first_time = TRUE;
|
|
DCL_LOCK_STATE;
|
|
|
|
while (GC_finalize_now != 0) {
|
|
# ifdef THREADS
|
|
DISABLE_SIGNALS();
|
|
LOCK();
|
|
# endif
|
|
if (first_time) {
|
|
mem_freed_before = GC_mem_freed;
|
|
first_time = FALSE;
|
|
}
|
|
curr_fo = GC_finalize_now;
|
|
# ifdef THREADS
|
|
if (curr_fo != 0) GC_finalize_now = fo_next(curr_fo);
|
|
UNLOCK();
|
|
ENABLE_SIGNALS();
|
|
if (curr_fo == 0) break;
|
|
# else
|
|
GC_finalize_now = fo_next(curr_fo);
|
|
# endif
|
|
fo_set_next(curr_fo, 0);
|
|
(*(curr_fo -> fo_fn))((ptr_t)(curr_fo -> fo_hidden_base),
|
|
curr_fo -> fo_client_data);
|
|
curr_fo -> fo_client_data = 0;
|
|
++count;
|
|
# ifdef UNDEFINED
|
|
/* This is probably a bad idea. It throws off accounting if */
|
|
/* nearly all objects are finalizable. O.w. it shouldn't */
|
|
/* matter. */
|
|
GC_free((GC_PTR)curr_fo);
|
|
# endif
|
|
}
|
|
if (mem_freed_before != GC_mem_freed) {
|
|
LOCK();
|
|
GC_finalizer_mem_freed += (GC_mem_freed - mem_freed_before);
|
|
UNLOCK();
|
|
}
|
|
return count;
|
|
}
|
|
|
|
void (* GC_finalizer_notifier)() = (void (*) GC_PROTO((void)))0;
|
|
|
|
static GC_word last_finalizer_notification = 0;
|
|
|
|
void GC_notify_or_invoke_finalizers GC_PROTO((void))
|
|
{
|
|
if (GC_finalize_now == 0) return;
|
|
if (!GC_finalize_on_demand) {
|
|
(void) GC_invoke_finalizers();
|
|
GC_ASSERT(GC_finalize_now == 0);
|
|
return;
|
|
}
|
|
if (GC_finalizer_notifier != (void (*) GC_PROTO((void)))0
|
|
&& last_finalizer_notification != GC_gc_no) {
|
|
last_finalizer_notification = GC_gc_no;
|
|
GC_finalizer_notifier();
|
|
}
|
|
}
|
|
|
|
# ifdef __STDC__
|
|
GC_PTR GC_call_with_alloc_lock(GC_fn_type fn,
|
|
GC_PTR client_data)
|
|
# else
|
|
GC_PTR GC_call_with_alloc_lock(fn, client_data)
|
|
GC_fn_type fn;
|
|
GC_PTR client_data;
|
|
# endif
|
|
{
|
|
GC_PTR result;
|
|
DCL_LOCK_STATE;
|
|
|
|
# ifdef THREADS
|
|
DISABLE_SIGNALS();
|
|
LOCK();
|
|
SET_LOCK_HOLDER();
|
|
# endif
|
|
result = (*fn)(client_data);
|
|
# ifdef THREADS
|
|
# ifndef GC_ASSERTIONS
|
|
UNSET_LOCK_HOLDER();
|
|
# endif /* o.w. UNLOCK() does it implicitly */
|
|
UNLOCK();
|
|
ENABLE_SIGNALS();
|
|
# endif
|
|
return(result);
|
|
}
|
|
|