* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
+ * Copyright (C) 2007 Free Software Foundation, Inc
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
}
new_dl = (struct disappearing_link *)
GC_INTERNAL_MALLOC(sizeof(struct disappearing_link),NORMAL);
- if (new_dl != 0) {
- new_dl -> dl_hidden_obj = HIDE_POINTER(obj);
- new_dl -> dl_hidden_link = HIDE_POINTER(link);
- dl_set_next(new_dl, dl_head[index]);
- dl_head[index] = new_dl;
- GC_dl_entries++;
- } else {
- GC_finalization_failures++;
+ if (0 == new_dl) {
+# ifdef THREADS
+ UNLOCK();
+ ENABLE_SIGNALS();
+# endif
+ new_dl = (struct disappearing_link *)
+ GC_oom_fn(sizeof(struct disappearing_link));
+ if (0 == new_dl) {
+ GC_finalization_failures++;
+ return(0);
+ }
+ /* It's not likely we'll make it here, but ... */
+# ifdef THREADS
+ DISABLE_SIGNALS();
+ LOCK();
+# endif
}
+ new_dl -> dl_hidden_obj = HIDE_POINTER(obj);
+ new_dl -> dl_hidden_link = HIDE_POINTER(link);
+ dl_set_next(new_dl, dl_head[index]);
+ dl_head[index] = new_dl;
+ GC_dl_entries++;
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
UNLOCK();
ENABLE_SIGNALS();
# ifdef DBG_HDRS_ALL
- dl_next(curr_dl) = 0;
+ dl_set_next(curr_dl, 0);
# else
GC_free((GC_PTR)curr_dl);
# endif
{
}
+/* Possible finalization_marker procedures. Note that mark stack */
+/* overflow is handled by the caller, and is not a disaster. */
+GC_API void GC_unreachable_finalize_mark_proc(p)
+ptr_t p;
+{
+ return GC_normal_finalize_mark_proc(p);
+}
+
/* Register a finalization function. See gc.h for details. */
}
new_fo = (struct finalizable_object *)
GC_INTERNAL_MALLOC(sizeof(struct finalizable_object),NORMAL);
- if (new_fo != 0) {
- new_fo -> fo_hidden_base = (word)HIDE_POINTER(base);
- new_fo -> fo_fn = fn;
- new_fo -> fo_client_data = (ptr_t)cd;
- new_fo -> fo_object_size = hhdr -> hb_sz;
- new_fo -> fo_mark_proc = mp;
- fo_set_next(new_fo, fo_head[index]);
- GC_fo_entries++;
- fo_head[index] = new_fo;
- } else {
- GC_finalization_failures++;
+ if (0 == new_fo) {
+# ifdef THREADS
+ UNLOCK();
+ ENABLE_SIGNALS();
+# endif
+ new_fo = (struct finalizable_object *)
+ GC_oom_fn(sizeof(struct finalizable_object));
+ if (0 == new_fo) {
+ GC_finalization_failures++;
+ return;
+ }
+ /* It's not likely we'll make it here, but ... */
+# ifdef THREADS
+ DISABLE_SIGNALS();
+ LOCK();
+# endif
}
+ new_fo -> fo_hidden_base = (word)HIDE_POINTER(base);
+ new_fo -> fo_fn = fn;
+ new_fo -> fo_client_data = (ptr_t)cd;
+ new_fo -> fo_object_size = hhdr -> hb_sz;
+ new_fo -> fo_mark_proc = mp;
+ fo_set_next(new_fo, fo_head[index]);
+ GC_fo_entries++;
+ fo_head[index] = new_fo;
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
ocd, GC_null_finalize_mark_proc);
}
+# if defined(__STDC__)
+ void GC_register_finalizer_unreachable(void * obj,
+ GC_finalization_proc fn, void * cd,
+ GC_finalization_proc *ofn, void ** ocd)
+# else
+ void GC_register_finalizer_unreachable(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_unreachable_finalize_mark_proc);
+}
+
#ifndef NO_DEBUGGING
void GC_dump_finalization()
{
GC_words_finalized +=
ALIGNED_WORDS(curr_fo -> fo_object_size)
+ ALIGNED_WORDS(sizeof(struct finalizable_object));
- GC_ASSERT(GC_is_marked((ptr_t)curr_fo));
+ GC_ASSERT(GC_is_marked(GC_base((ptr_t)curr_fo)));
curr_fo = next_fo;
} else {
prev_fo = curr_fo;
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);
+ if (curr_fo -> fo_mark_proc != GC_unreachable_finalize_mark_proc) {
+ GC_set_mark_bit(real_ptr);
+ }
}
}
+
+ /* now revive finalize-when-unreachable objects reachable from
+ other finalizable objects */
+ curr_fo = GC_finalize_now;
+ prev_fo = 0;
+ while (curr_fo != 0) {
+ next_fo = fo_next(curr_fo);
+ if (curr_fo -> fo_mark_proc == GC_unreachable_finalize_mark_proc) {
+ real_ptr = (ptr_t)curr_fo -> fo_hidden_base;
+ if (!GC_is_marked(real_ptr)) {
+ GC_set_mark_bit(real_ptr);
+ } else {
+ if (prev_fo == 0)
+ GC_finalize_now = next_fo;
+ else
+ fo_set_next(prev_fo, next_fo);
+
+ curr_fo -> fo_hidden_base =
+ (word) HIDE_POINTER(curr_fo -> fo_hidden_base);
+ GC_words_finalized -=
+ ALIGNED_WORDS(curr_fo -> fo_object_size)
+ + ALIGNED_WORDS(sizeof(struct finalizable_object));
+
+ i = HASH2(real_ptr, log_fo_table_size);
+ fo_set_next (curr_fo, fo_head[i]);
+ GC_fo_entries++;
+ fo_head[i] = curr_fo;
+ curr_fo = prev_fo;
+ }
+ }
+ prev_fo = curr_fo;
+ curr_fo = next_fo;
+ }
}
/* Remove dangling disappearing links. */
/* Should be called without allocation lock. */
int GC_invoke_finalizers()
{
- register struct finalizable_object * curr_fo;
- register int count = 0;
+ struct finalizable_object * curr_fo;
+ int count = 0;
+ word mem_freed_before;
DCL_LOCK_STATE;
while (GC_finalize_now != 0) {
DISABLE_SIGNALS();
LOCK();
# endif
+ if (count == 0) {
+ mem_freed_before = GC_mem_freed;
+ }
curr_fo = GC_finalize_now;
# ifdef THREADS
if (curr_fo != 0) GC_finalize_now = fo_next(curr_fo);
GC_free((GC_PTR)curr_fo);
# endif
}
+ if (count != 0 && mem_freed_before != GC_mem_freed) {
+ LOCK();
+ GC_finalizer_mem_freed += (GC_mem_freed - mem_freed_before);
+ UNLOCK();
+ }
return count;
}
void GC_notify_or_invoke_finalizers GC_PROTO((void))
{
+ /* This is a convenient place to generate backtraces if appropriate, */
+ /* since that code is not callable with the allocation lock. */
+# if defined(KEEP_BACK_PTRS) || defined(MAKE_BACK_GRAPH)
+ static word last_back_trace_gc_no = 1; /* Skip first one. */
+
+ if (GC_gc_no > last_back_trace_gc_no) {
+ word i;
+
+# ifdef KEEP_BACK_PTRS
+ LOCK();
+ /* Stops when GC_gc_no wraps; that's OK. */
+ last_back_trace_gc_no = (word)(-1); /* disable others. */
+ for (i = 0; i < GC_backtraces; ++i) {
+ /* FIXME: This tolerates concurrent heap mutation, */
+ /* which may cause occasional mysterious results. */
+ /* We need to release the GC lock, since GC_print_callers */
+ /* acquires it. It probably shouldn't. */
+ UNLOCK();
+ GC_generate_random_backtrace_no_gc();
+ LOCK();
+ }
+ last_back_trace_gc_no = GC_gc_no;
+ UNLOCK();
+# endif
+# ifdef MAKE_BACK_GRAPH
+ if (GC_print_back_height)
+ GC_print_back_graph_stats();
+# endif
+ }
+# endif
if (GC_finalize_now == 0) return;
if (!GC_finalize_on_demand) {
(void) GC_invoke_finalizers();
- GC_ASSERT(GC_finalize_now == 0);
+# ifndef THREADS
+ GC_ASSERT(GC_finalize_now == 0);
+# endif /* Otherwise GC can run concurrently and add more */
return;
}
if (GC_finalizer_notifier != (void (*) GC_PROTO((void)))0
# endif
return(result);
}
+
+#if !defined(NO_DEBUGGING)
+
+void GC_print_finalization_stats()
+{
+ struct finalizable_object *fo = GC_finalize_now;
+ size_t ready = 0;
+
+ GC_printf2("%lu finalization table entries; %lu disappearing links\n",
+ GC_fo_entries, GC_dl_entries);
+ for (; 0 != fo; fo = fo_next(fo)) ++ready;
+ GC_printf1("%lu objects are eligible for immediate finalization\n", ready);
+}
+
+#endif /* NO_DEBUGGING */
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