+++ /dev/null
-/*
- * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
- * Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
- * Copyright (c) 1998 by Silicon Graphics. All rights reserved.
- * Copyright (c) 1999 by Hewlett-Packard Company. All rights reserved.
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
- * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program
- * for any purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is granted,
- * provided the above notices are retained, and a notice that the code was
- * modified is included with the above copyright notice.
- *
- */
-
-
-# include "private/gc_priv.h"
-
-# include <stdio.h>
-# if !defined(MACOS) && !defined(MSWINCE)
-# include <signal.h>
-# include <sys/types.h>
-# endif
-
-/*
- * Separate free lists are maintained for different sized objects
- * up to MAXOBJSZ.
- * The call GC_allocobj(i,k) ensures that the freelist for
- * kind k objects of size i points to a non-empty
- * free list. It returns a pointer to the first entry on the free list.
- * In a single-threaded world, GC_allocobj may be called to allocate
- * an object of (small) size i as follows:
- *
- * opp = &(GC_objfreelist[i]);
- * if (*opp == 0) GC_allocobj(i, NORMAL);
- * ptr = *opp;
- * *opp = obj_link(ptr);
- *
- * Note that this is very fast if the free list is non-empty; it should
- * only involve the execution of 4 or 5 simple instructions.
- * All composite objects on freelists are cleared, except for
- * their first word.
- */
-
-/*
- * The allocator uses GC_allochblk to allocate large chunks of objects.
- * These chunks all start on addresses which are multiples of
- * HBLKSZ. Each allocated chunk has an associated header,
- * which can be located quickly based on the address of the chunk.
- * (See headers.c for details.)
- * This makes it possible to check quickly whether an
- * arbitrary address corresponds to an object administered by the
- * allocator.
- */
-
-word GC_non_gc_bytes = 0; /* Number of bytes not intended to be collected */
-
-word GC_gc_no = 0;
-
-#ifndef SMALL_CONFIG
- int GC_incremental = 0; /* By default, stop the world. */
-#endif
-
-int GC_parallel = FALSE; /* By default, parallel GC is off. */
-
-int GC_full_freq = 19; /* Every 20th collection is a full */
- /* collection, whether we need it */
- /* or not. */
-
-GC_bool GC_need_full_gc = FALSE;
- /* Need full GC do to heap growth. */
-
-word GC_used_heap_size_after_full = 0;
-
-char * GC_copyright[] =
-{"Copyright 1988,1989 Hans-J. Boehm and Alan J. Demers ",
-"Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved. ",
-"Copyright (c) 1996-1998 by Silicon Graphics. All rights reserved. ",
-"Copyright (c) 1999-2001 by Hewlett-Packard Company. All rights reserved. ",
-"THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY",
-" EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.",
-"See source code for details." };
-
-# include "version.h"
-
-/* some more variables */
-
-extern signed_word GC_mem_found; /* Number of reclaimed longwords */
- /* after garbage collection */
-
-GC_bool GC_dont_expand = 0;
-
-word GC_free_space_divisor = 3;
-
-extern GC_bool GC_collection_in_progress();
- /* Collection is in progress, or was abandoned. */
-
-extern GC_bool GC_print_back_height;
-
-int GC_never_stop_func GC_PROTO((void)) { return(0); }
-
-unsigned long GC_time_limit = TIME_LIMIT;
-
-CLOCK_TYPE GC_start_time; /* Time at which we stopped world. */
- /* used only in GC_timeout_stop_func. */
-
-int GC_n_attempts = 0; /* Number of attempts at finishing */
- /* collection within GC_time_limit. */
-
-#if defined(SMALL_CONFIG) || defined(NO_CLOCK)
-# define GC_timeout_stop_func GC_never_stop_func
-#else
- int GC_timeout_stop_func GC_PROTO((void))
- {
- CLOCK_TYPE current_time;
- static unsigned count = 0;
- unsigned long time_diff;
-
- if ((count++ & 3) != 0) return(0);
-#ifndef NO_CLOCK
- GET_TIME(current_time);
- time_diff = MS_TIME_DIFF(current_time,GC_start_time);
- if (time_diff >= GC_time_limit) {
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf0("Abandoning stopped marking after ");
- GC_printf1("%lu msecs", (unsigned long)time_diff);
- GC_printf1("(attempt %d)\n", (unsigned long) GC_n_attempts);
- }
-# endif
- return(1);
- }
-#endif
- return(0);
- }
-#endif /* !SMALL_CONFIG */
-
-/* Return the minimum number of words that must be allocated between */
-/* collections to amortize the collection cost. */
-static word min_words_allocd()
-{
-# ifdef THREADS
- /* We punt, for now. */
- register signed_word stack_size = 10000;
-# else
- int dummy;
- register signed_word stack_size = (ptr_t)(&dummy) - GC_stackbottom;
-# endif
- word total_root_size; /* includes double stack size, */
- /* since the stack is expensive */
- /* to scan. */
- word scan_size; /* Estimate of memory to be scanned */
- /* during normal GC. */
-
- if (stack_size < 0) stack_size = -stack_size;
- total_root_size = 2 * stack_size + GC_root_size;
- scan_size = BYTES_TO_WORDS(GC_heapsize - GC_large_free_bytes
- + (GC_large_free_bytes >> 2)
- /* use a bit more of large empty heap */
- + total_root_size);
- if (GC_incremental) {
- return scan_size / (2 * GC_free_space_divisor);
- } else {
- return scan_size / GC_free_space_divisor;
- }
-}
-
-/* Return the number of words allocated, adjusted for explicit storage */
-/* management, etc.. This number is used in deciding when to trigger */
-/* collections. */
-word GC_adj_words_allocd()
-{
- register signed_word result;
- register signed_word expl_managed =
- BYTES_TO_WORDS((long)GC_non_gc_bytes
- - (long)GC_non_gc_bytes_at_gc);
-
- /* Don't count what was explicitly freed, or newly allocated for */
- /* explicit management. Note that deallocating an explicitly */
- /* managed object should not alter result, assuming the client */
- /* is playing by the rules. */
- result = (signed_word)GC_words_allocd
- - (signed_word)GC_mem_freed - expl_managed;
- if (result > (signed_word)GC_words_allocd) {
- result = GC_words_allocd;
- /* probably client bug or unfortunate scheduling */
- }
- result += GC_words_finalized;
- /* We count objects enqueued for finalization as though they */
- /* had been reallocated this round. Finalization is user */
- /* visible progress. And if we don't count this, we have */
- /* stability problems for programs that finalize all objects. */
- result += GC_words_wasted;
- /* This doesn't reflect useful work. But if there is lots of */
- /* new fragmentation, the same is probably true of the heap, */
- /* and the collection will be correspondingly cheaper. */
- if (result < (signed_word)(GC_words_allocd >> 3)) {
- /* Always count at least 1/8 of the allocations. We don't want */
- /* to collect too infrequently, since that would inhibit */
- /* coalescing of free storage blocks. */
- /* This also makes us partially robust against client bugs. */
- return(GC_words_allocd >> 3);
- } else {
- return(result);
- }
-}
-
-
-/* Clear up a few frames worth of garbage left at the top of the stack. */
-/* This is used to prevent us from accidentally treating garbade left */
-/* on the stack by other parts of the collector as roots. This */
-/* differs from the code in misc.c, which actually tries to keep the */
-/* stack clear of long-lived, client-generated garbage. */
-void GC_clear_a_few_frames()
-{
-# define NWORDS 64
- word frames[NWORDS];
- register int i;
-
- for (i = 0; i < NWORDS; i++) frames[i] = 0;
-}
-
-/* Have we allocated enough to amortize a collection? */
-GC_bool GC_should_collect()
-{
- return(GC_adj_words_allocd() >= min_words_allocd());
-}
-
-
-void GC_notify_full_gc()
-{
- if (GC_start_call_back != (void (*) GC_PROTO((void)))0) {
- (*GC_start_call_back)();
- }
-}
-
-GC_bool GC_is_full_gc = FALSE;
-
-/*
- * Initiate a garbage collection if appropriate.
- * Choose judiciously
- * between partial, full, and stop-world collections.
- * Assumes lock held, signals disabled.
- */
-void GC_maybe_gc()
-{
- static int n_partial_gcs = 0;
-
- if (GC_should_collect()) {
- if (!GC_incremental) {
- GC_notify_full_gc();
- GC_gcollect_inner();
- n_partial_gcs = 0;
- return;
- } else {
-# ifdef PARALLEL_MARK
- GC_wait_for_reclaim();
-# endif
- if (GC_need_full_gc || n_partial_gcs >= GC_full_freq) {
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf2(
- "***>Full mark for collection %lu after %ld allocd bytes\n",
- (unsigned long) GC_gc_no+1,
- (long)WORDS_TO_BYTES(GC_words_allocd));
- }
-# endif
- GC_promote_black_lists();
- (void)GC_reclaim_all((GC_stop_func)0, TRUE);
- GC_clear_marks();
- n_partial_gcs = 0;
- GC_notify_full_gc();
- GC_is_full_gc = TRUE;
- } else {
- n_partial_gcs++;
- }
- }
- /* We try to mark with the world stopped. */
- /* If we run out of time, this turns into */
- /* incremental marking. */
-# ifndef NO_CLOCK
- if (GC_time_limit != GC_TIME_UNLIMITED) { GET_TIME(GC_start_time); }
-# endif
- if (GC_stopped_mark(GC_time_limit == GC_TIME_UNLIMITED?
- GC_never_stop_func : GC_timeout_stop_func)) {
-# ifdef SAVE_CALL_CHAIN
- GC_save_callers(GC_last_stack);
-# endif
- GC_finish_collection();
- } else {
- if (!GC_is_full_gc) {
- /* Count this as the first attempt */
- GC_n_attempts++;
- }
- }
- }
-}
-
-
-/*
- * Stop the world garbage collection. Assumes lock held, signals disabled.
- * If stop_func is not GC_never_stop_func, then abort if stop_func returns TRUE.
- */
-GC_bool GC_try_to_collect_inner(stop_func)
-GC_stop_func stop_func;
-{
- if (GC_incremental && GC_collection_in_progress()) {
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf0(
- "GC_try_to_collect_inner: finishing collection in progress\n");
- }
-# endif /* CONDPRINT */
- /* Just finish collection already in progress. */
- while(GC_collection_in_progress()) {
- if (stop_func()) return(FALSE);
- GC_collect_a_little_inner(1);
- }
- }
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf2(
- "Initiating full world-stop collection %lu after %ld allocd bytes\n",
- (unsigned long) GC_gc_no+1,
- (long)WORDS_TO_BYTES(GC_words_allocd));
- }
-# endif
- GC_promote_black_lists();
- /* Make sure all blocks have been reclaimed, so sweep routines */
- /* don't see cleared mark bits. */
- /* If we're guaranteed to finish, then this is unnecessary. */
- /* In the find_leak case, we have to finish to guarantee that */
- /* previously unmarked objects are not reported as leaks. */
-# ifdef PARALLEL_MARK
- GC_wait_for_reclaim();
-# endif
- if ((GC_find_leak || stop_func != GC_never_stop_func)
- && !GC_reclaim_all(stop_func, FALSE)) {
- /* Aborted. So far everything is still consistent. */
- return(FALSE);
- }
- GC_invalidate_mark_state(); /* Flush mark stack. */
- GC_clear_marks();
-# ifdef SAVE_CALL_CHAIN
- GC_save_callers(GC_last_stack);
-# endif
- GC_is_full_gc = TRUE;
- if (!GC_stopped_mark(stop_func)) {
- if (!GC_incremental) {
- /* We're partially done and have no way to complete or use */
- /* current work. Reestablish invariants as cheaply as */
- /* possible. */
- GC_invalidate_mark_state();
- GC_unpromote_black_lists();
- } /* else we claim the world is already still consistent. We'll */
- /* finish incrementally. */
- return(FALSE);
- }
- GC_finish_collection();
- return(TRUE);
-}
-
-
-
-/*
- * Perform n units of garbage collection work. A unit is intended to touch
- * roughly GC_RATE pages. Every once in a while, we do more than that.
- * This needa to be a fairly large number with our current incremental
- * GC strategy, since otherwise we allocate too much during GC, and the
- * cleanup gets expensive.
- */
-# define GC_RATE 10
-# define MAX_PRIOR_ATTEMPTS 1
- /* Maximum number of prior attempts at world stop marking */
- /* A value of 1 means that we finish the second time, no matter */
- /* how long it takes. Doesn't count the initial root scan */
- /* for a full GC. */
-
-int GC_deficit = 0; /* The number of extra calls to GC_mark_some */
- /* that we have made. */
-
-void GC_collect_a_little_inner(n)
-int n;
-{
- register int i;
-
- if (GC_incremental && GC_collection_in_progress()) {
- for (i = GC_deficit; i < GC_RATE*n; i++) {
- if (GC_mark_some((ptr_t)0)) {
- /* Need to finish a collection */
-# ifdef SAVE_CALL_CHAIN
- GC_save_callers(GC_last_stack);
-# endif
-# ifdef PARALLEL_MARK
- GC_wait_for_reclaim();
-# endif
- if (GC_n_attempts < MAX_PRIOR_ATTEMPTS
- && GC_time_limit != GC_TIME_UNLIMITED) {
- GET_TIME(GC_start_time);
- if (!GC_stopped_mark(GC_timeout_stop_func)) {
- GC_n_attempts++;
- break;
- }
- } else {
- (void)GC_stopped_mark(GC_never_stop_func);
- }
- GC_finish_collection();
- break;
- }
- }
- if (GC_deficit > 0) GC_deficit -= GC_RATE*n;
- if (GC_deficit < 0) GC_deficit = 0;
- } else {
- GC_maybe_gc();
- }
-}
-
-int GC_collect_a_little GC_PROTO(())
-{
- int result;
- DCL_LOCK_STATE;
-
- DISABLE_SIGNALS();
- LOCK();
- GC_collect_a_little_inner(1);
- result = (int)GC_collection_in_progress();
- UNLOCK();
- ENABLE_SIGNALS();
- return(result);
-}
-
-/*
- * Assumes lock is held, signals are disabled.
- * We stop the world.
- * If stop_func() ever returns TRUE, we may fail and return FALSE.
- * Increment GC_gc_no if we succeed.
- */
-GC_bool GC_stopped_mark(stop_func)
-GC_stop_func stop_func;
-{
- register int i;
- int dummy;
-# if defined(PRINTTIMES) || defined(CONDPRINT)
- CLOCK_TYPE start_time, current_time;
-# endif
-
- STOP_WORLD();
-# ifdef PRINTTIMES
- GET_TIME(start_time);
-# endif
-# if defined(CONDPRINT) && !defined(PRINTTIMES)
- if (GC_print_stats) GET_TIME(start_time);
-# endif
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf1("--> Marking for collection %lu ",
- (unsigned long) GC_gc_no + 1);
- GC_printf2("after %lu allocd bytes + %lu wasted bytes\n",
- (unsigned long) WORDS_TO_BYTES(GC_words_allocd),
- (unsigned long) WORDS_TO_BYTES(GC_words_wasted));
- }
-# endif
-# ifdef MAKE_BACK_GRAPH
- if (GC_print_back_height) {
- GC_build_back_graph();
- }
-# endif
-
- /* Mark from all roots. */
- /* Minimize junk left in my registers and on the stack */
- GC_clear_a_few_frames();
- GC_noop(0,0,0,0,0,0);
- GC_initiate_gc();
- for(i = 0;;i++) {
- if ((*stop_func)()) {
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf0("Abandoned stopped marking after ");
- GC_printf1("%lu iterations\n",
- (unsigned long)i);
- }
-# endif
- GC_deficit = i; /* Give the mutator a chance. */
- START_WORLD();
- return(FALSE);
- }
- if (GC_mark_some((ptr_t)(&dummy))) break;
- }
-
- GC_gc_no++;
-# ifdef PRINTSTATS
- GC_printf2("Collection %lu reclaimed %ld bytes",
- (unsigned long) GC_gc_no - 1,
- (long)WORDS_TO_BYTES(GC_mem_found));
-# else
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf1("Collection %lu finished", (unsigned long) GC_gc_no - 1);
- }
-# endif
-# endif /* !PRINTSTATS */
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf1(" ---> heapsize = %lu bytes\n",
- (unsigned long) GC_heapsize);
- /* Printf arguments may be pushed in funny places. Clear the */
- /* space. */
- GC_printf0("");
- }
-# endif /* CONDPRINT */
-
- /* Check all debugged objects for consistency */
- if (GC_debugging_started) {
- (*GC_check_heap)();
- }
-
-# ifdef PRINTTIMES
- GET_TIME(current_time);
- GC_printf1("World-stopped marking took %lu msecs\n",
- MS_TIME_DIFF(current_time,start_time));
-# else
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GET_TIME(current_time);
- GC_printf1("World-stopped marking took %lu msecs\n",
- MS_TIME_DIFF(current_time,start_time));
- }
-# endif
-# endif
- START_WORLD();
- return(TRUE);
-}
-
-/* Set all mark bits for the free list whose first entry is q */
-#ifdef __STDC__
- void GC_set_fl_marks(ptr_t q)
-#else
- void GC_set_fl_marks(q)
- ptr_t q;
-#endif
-{
- ptr_t p;
- struct hblk * h, * last_h = 0;
- hdr *hhdr;
- int word_no;
-
- for (p = q; p != 0; p = obj_link(p)){
- h = HBLKPTR(p);
- if (h != last_h) {
- last_h = h;
- hhdr = HDR(h);
- }
- word_no = (((word *)p) - ((word *)h));
- set_mark_bit_from_hdr(hhdr, word_no);
- }
-}
-
-/* Clear all mark bits for the free list whose first entry is q */
-/* Decrement GC_mem_found by number of words on free list. */
-#ifdef __STDC__
- void GC_clear_fl_marks(ptr_t q)
-#else
- void GC_clear_fl_marks(q)
- ptr_t q;
-#endif
-{
- ptr_t p;
- struct hblk * h, * last_h = 0;
- hdr *hhdr;
- int word_no;
-
- for (p = q; p != 0; p = obj_link(p)){
- h = HBLKPTR(p);
- if (h != last_h) {
- last_h = h;
- hhdr = HDR(h);
- }
- word_no = (((word *)p) - ((word *)h));
- clear_mark_bit_from_hdr(hhdr, word_no);
-# ifdef GATHERSTATS
- GC_mem_found -= hhdr -> hb_sz;
-# endif
- }
-}
-
-/* Finish up a collection. Assumes lock is held, signals are disabled, */
-/* but the world is otherwise running. */
-void GC_finish_collection()
-{
-# ifdef PRINTTIMES
- CLOCK_TYPE start_time;
- CLOCK_TYPE finalize_time;
- CLOCK_TYPE done_time;
-
- GET_TIME(start_time);
- finalize_time = start_time;
-# endif
-
-# ifdef GATHERSTATS
- GC_mem_found = 0;
-# endif
-# if defined(LINUX) && defined(__ELF__) && !defined(SMALL_CONFIG)
- if (getenv("GC_PRINT_ADDRESS_MAP") != 0) {
- GC_print_address_map();
- }
-# endif
- if (GC_find_leak) {
- /* Mark all objects on the free list. All objects should be */
- /* marked when we're done. */
- {
- register word size; /* current object size */
- int kind;
- ptr_t q;
-
- for (kind = 0; kind < GC_n_kinds; kind++) {
- for (size = 1; size <= MAXOBJSZ; size++) {
- q = GC_obj_kinds[kind].ok_freelist[size];
- if (q != 0) GC_set_fl_marks(q);
- }
- }
- }
- GC_start_reclaim(TRUE);
- /* The above just checks; it doesn't really reclaim anything. */
- }
-
- GC_finalize();
-# ifdef STUBBORN_ALLOC
- GC_clean_changing_list();
-# endif
-
-# ifdef PRINTTIMES
- GET_TIME(finalize_time);
-# endif
-
- if (GC_print_back_height) {
-# ifdef MAKE_BACK_GRAPH
- GC_traverse_back_graph();
-# else
-# ifndef SMALL_CONFIG
- GC_err_printf0("Back height not available: "
- "Rebuild collector with -DMAKE_BACK_GRAPH\n");
-# endif
-# endif
- }
-
- /* Clear free list mark bits, in case they got accidentally marked */
- /* (or GC_find_leak is set and they were intentionally marked). */
- /* Also subtract memory remaining from GC_mem_found count. */
- /* Note that composite objects on free list are cleared. */
- /* Thus accidentally marking a free list is not a problem; only */
- /* objects on the list itself will be marked, and that's fixed here. */
- {
- register word size; /* current object size */
- register ptr_t q; /* pointer to current object */
- int kind;
-
- for (kind = 0; kind < GC_n_kinds; kind++) {
- for (size = 1; size <= MAXOBJSZ; size++) {
- q = GC_obj_kinds[kind].ok_freelist[size];
- if (q != 0) GC_clear_fl_marks(q);
- }
- }
- }
-
-
-# ifdef PRINTSTATS
- GC_printf1("Bytes recovered before sweep - f.l. count = %ld\n",
- (long)WORDS_TO_BYTES(GC_mem_found));
-# endif
- /* Reconstruct free lists to contain everything not marked */
- GC_start_reclaim(FALSE);
- if (GC_is_full_gc) {
- GC_used_heap_size_after_full = USED_HEAP_SIZE;
- GC_need_full_gc = FALSE;
- } else {
- GC_need_full_gc =
- BYTES_TO_WORDS(USED_HEAP_SIZE - GC_used_heap_size_after_full)
- > min_words_allocd();
- }
-
-# ifdef PRINTSTATS
- GC_printf2(
- "Immediately reclaimed %ld bytes in heap of size %lu bytes",
- (long)WORDS_TO_BYTES(GC_mem_found),
- (unsigned long)GC_heapsize);
-# ifdef USE_MUNMAP
- GC_printf1("(%lu unmapped)", GC_unmapped_bytes);
-# endif
- GC_printf2(
- "\n%lu (atomic) + %lu (composite) collectable bytes in use\n",
- (unsigned long)WORDS_TO_BYTES(GC_atomic_in_use),
- (unsigned long)WORDS_TO_BYTES(GC_composite_in_use));
-# endif
-
- GC_n_attempts = 0;
- GC_is_full_gc = FALSE;
- /* Reset or increment counters for next cycle */
- GC_words_allocd_before_gc += GC_words_allocd;
- GC_non_gc_bytes_at_gc = GC_non_gc_bytes;
- GC_words_allocd = 0;
- GC_words_wasted = 0;
- GC_mem_freed = 0;
-
-# ifdef USE_MUNMAP
- GC_unmap_old();
-# endif
-# ifdef PRINTTIMES
- GET_TIME(done_time);
- GC_printf2("Finalize + initiate sweep took %lu + %lu msecs\n",
- MS_TIME_DIFF(finalize_time,start_time),
- MS_TIME_DIFF(done_time,finalize_time));
-# endif
-}
-
-/* Externally callable routine to invoke full, stop-world collection */
-# if defined(__STDC__) || defined(__cplusplus)
- int GC_try_to_collect(GC_stop_func stop_func)
-# else
- int GC_try_to_collect(stop_func)
- GC_stop_func stop_func;
-# endif
-{
- int result;
- DCL_LOCK_STATE;
-
- GC_INVOKE_FINALIZERS();
- DISABLE_SIGNALS();
- LOCK();
- ENTER_GC();
- if (!GC_is_initialized) GC_init_inner();
- /* Minimize junk left in my registers */
- GC_noop(0,0,0,0,0,0);
- result = (int)GC_try_to_collect_inner(stop_func);
- EXIT_GC();
- UNLOCK();
- ENABLE_SIGNALS();
- if(result) GC_INVOKE_FINALIZERS();
- return(result);
-}
-
-void GC_gcollect GC_PROTO(())
-{
- GC_notify_full_gc();
- (void)GC_try_to_collect(GC_never_stop_func);
-}
-
-word GC_n_heap_sects = 0; /* Number of sections currently in heap. */
-
-/*
- * Use the chunk of memory starting at p of size bytes as part of the heap.
- * Assumes p is HBLKSIZE aligned, and bytes is a multiple of HBLKSIZE.
- */
-void GC_add_to_heap(p, bytes)
-struct hblk *p;
-word bytes;
-{
- word words;
- hdr * phdr;
-
- if (GC_n_heap_sects >= MAX_HEAP_SECTS) {
- ABORT("Too many heap sections: Increase MAXHINCR or MAX_HEAP_SECTS");
- }
- phdr = GC_install_header(p);
- if (0 == phdr) {
- /* This is extremely unlikely. Can't add it. This will */
- /* almost certainly result in a 0 return from the allocator, */
- /* which is entirely appropriate. */
- return;
- }
- GC_heap_sects[GC_n_heap_sects].hs_start = (ptr_t)p;
- GC_heap_sects[GC_n_heap_sects].hs_bytes = bytes;
- GC_n_heap_sects++;
- words = BYTES_TO_WORDS(bytes);
- phdr -> hb_sz = words;
- phdr -> hb_map = (unsigned char *)1; /* A value != GC_invalid_map */
- phdr -> hb_flags = 0;
- GC_freehblk(p);
- GC_heapsize += bytes;
- if ((ptr_t)p <= (ptr_t)GC_least_plausible_heap_addr
- || GC_least_plausible_heap_addr == 0) {
- GC_least_plausible_heap_addr = (GC_PTR)((ptr_t)p - sizeof(word));
- /* Making it a little smaller than necessary prevents */
- /* us from getting a false hit from the variable */
- /* itself. There's some unintentional reflection */
- /* here. */
- }
- if ((ptr_t)p + bytes >= (ptr_t)GC_greatest_plausible_heap_addr) {
- GC_greatest_plausible_heap_addr = (GC_PTR)((ptr_t)p + bytes);
- }
-}
-
-# if !defined(NO_DEBUGGING)
-void GC_print_heap_sects()
-{
- register unsigned i;
-
- GC_printf1("Total heap size: %lu\n", (unsigned long) GC_heapsize);
- for (i = 0; i < GC_n_heap_sects; i++) {
- unsigned long start = (unsigned long) GC_heap_sects[i].hs_start;
- unsigned long len = (unsigned long) GC_heap_sects[i].hs_bytes;
- struct hblk *h;
- unsigned nbl = 0;
-
- GC_printf3("Section %ld from 0x%lx to 0x%lx ", (unsigned long)i,
- start, (unsigned long)(start + len));
- for (h = (struct hblk *)start; h < (struct hblk *)(start + len); h++) {
- if (GC_is_black_listed(h, HBLKSIZE)) nbl++;
- }
- GC_printf2("%lu/%lu blacklisted\n", (unsigned long)nbl,
- (unsigned long)(len/HBLKSIZE));
- }
-}
-# endif
-
-GC_PTR GC_least_plausible_heap_addr = (GC_PTR)ONES;
-GC_PTR GC_greatest_plausible_heap_addr = 0;
-
-ptr_t GC_max(x,y)
-ptr_t x, y;
-{
- return(x > y? x : y);
-}
-
-ptr_t GC_min(x,y)
-ptr_t x, y;
-{
- return(x < y? x : y);
-}
-
-# if defined(__STDC__) || defined(__cplusplus)
- void GC_set_max_heap_size(GC_word n)
-# else
- void GC_set_max_heap_size(n)
- GC_word n;
-# endif
-{
- GC_max_heapsize = n;
-}
-
-GC_word GC_max_retries = 0;
-
-/*
- * this explicitly increases the size of the heap. It is used
- * internally, but may also be invoked from GC_expand_hp by the user.
- * The argument is in units of HBLKSIZE.
- * Tiny values of n are rounded up.
- * Returns FALSE on failure.
- */
-GC_bool GC_expand_hp_inner(n)
-word n;
-{
- word bytes;
- struct hblk * space;
- word expansion_slop; /* Number of bytes by which we expect the */
- /* heap to expand soon. */
-
- if (n < MINHINCR) n = MINHINCR;
- bytes = n * HBLKSIZE;
- /* Make sure bytes is a multiple of GC_page_size */
- {
- word mask = GC_page_size - 1;
- bytes += mask;
- bytes &= ~mask;
- }
-
- if (GC_max_heapsize != 0 && GC_heapsize + bytes > GC_max_heapsize) {
- /* Exceeded self-imposed limit */
- return(FALSE);
- }
- space = GET_MEM(bytes);
- if( space == 0 ) {
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf1("Failed to expand heap by %ld bytes\n",
- (unsigned long)bytes);
- }
-# endif
- return(FALSE);
- }
-# ifdef CONDPRINT
- if (GC_print_stats) {
- GC_printf2("Increasing heap size by %lu after %lu allocated bytes\n",
- (unsigned long)bytes,
- (unsigned long)WORDS_TO_BYTES(GC_words_allocd));
-# ifdef UNDEFINED
- GC_printf1("Root size = %lu\n", GC_root_size);
- GC_print_block_list(); GC_print_hblkfreelist();
- GC_printf0("\n");
-# endif
- }
-# endif
- expansion_slop = 8 * WORDS_TO_BYTES(min_words_allocd());
- if (5 * HBLKSIZE * MAXHINCR > expansion_slop) {
- expansion_slop = 5 * HBLKSIZE * MAXHINCR;
- }
- if (GC_last_heap_addr == 0 && !((word)space & SIGNB)
- || GC_last_heap_addr != 0 && GC_last_heap_addr < (ptr_t)space) {
- /* Assume the heap is growing up */
- GC_greatest_plausible_heap_addr =
- GC_max(GC_greatest_plausible_heap_addr,
- (ptr_t)space + bytes + expansion_slop);
- } else {
- /* Heap is growing down */
- GC_least_plausible_heap_addr =
- GC_min(GC_least_plausible_heap_addr,
- (ptr_t)space - expansion_slop);
- }
- GC_prev_heap_addr = GC_last_heap_addr;
- GC_last_heap_addr = (ptr_t)space;
- GC_add_to_heap(space, bytes);
- return(TRUE);
-}
-
-/* Really returns a bool, but it's externally visible, so that's clumsy. */
-/* Arguments is in bytes. */
-# if defined(__STDC__) || defined(__cplusplus)
- int GC_expand_hp(size_t bytes)
-# else
- int GC_expand_hp(bytes)
- size_t bytes;
-# endif
-{
- int result;
- DCL_LOCK_STATE;
-
- DISABLE_SIGNALS();
- LOCK();
- if (!GC_is_initialized) GC_init_inner();
- result = (int)GC_expand_hp_inner(divHBLKSZ((word)bytes));
- if (result) GC_requested_heapsize += bytes;
- UNLOCK();
- ENABLE_SIGNALS();
- return(result);
-}
-
-unsigned GC_fail_count = 0;
- /* How many consecutive GC/expansion failures? */
- /* Reset by GC_allochblk. */
-
-GC_bool GC_collect_or_expand(needed_blocks, ignore_off_page)
-word needed_blocks;
-GC_bool ignore_off_page;
-{
- if (!GC_incremental && !GC_dont_gc &&
- (GC_dont_expand && GC_words_allocd > 0 || GC_should_collect())) {
- GC_notify_full_gc();
- GC_gcollect_inner();
- } else {
- word blocks_to_get = GC_heapsize/(HBLKSIZE*GC_free_space_divisor)
- + needed_blocks;
-
- if (blocks_to_get > MAXHINCR) {
- word slop;
-
- if (ignore_off_page) {
- slop = 4;
- } else {
- slop = 2*divHBLKSZ(BL_LIMIT);
- if (slop > needed_blocks) slop = needed_blocks;
- }
- if (needed_blocks + slop > MAXHINCR) {
- blocks_to_get = needed_blocks + slop;
- } else {
- blocks_to_get = MAXHINCR;
- }
- }
- if (!GC_expand_hp_inner(blocks_to_get)
- && !GC_expand_hp_inner(needed_blocks)) {
- if (GC_fail_count++ < GC_max_retries) {
- WARN("Out of Memory! Trying to continue ...\n", 0);
- GC_notify_full_gc();
- GC_gcollect_inner();
- } else {
-# if !defined(AMIGA) || !defined(GC_AMIGA_FASTALLOC)
- WARN("Out of Memory! Returning NIL!\n", 0);
-# endif
- return(FALSE);
- }
- } else {
-# ifdef CONDPRINT
- if (GC_fail_count && GC_print_stats) {
- GC_printf0("Memory available again ...\n");
- }
-# endif
- }
- }
- return(TRUE);
-}
-
-/*
- * Make sure the object free list for sz is not empty.
- * Return a pointer to the first object on the free list.
- * The object MUST BE REMOVED FROM THE FREE LIST BY THE CALLER.
- * Assumes we hold the allocator lock and signals are disabled.
- *
- */
-ptr_t GC_allocobj(sz, kind)
-word sz;
-int kind;
-{
- register ptr_t * flh = &(GC_obj_kinds[kind].ok_freelist[sz]);
-
- if (sz == 0) return(0);
-
- while (*flh == 0) {
- ENTER_GC();
- /* Do our share of marking work */
- if(GC_incremental && !GC_dont_gc) GC_collect_a_little_inner(1);
- /* Sweep blocks for objects of this size */
- GC_continue_reclaim(sz, kind);
- EXIT_GC();
- if (*flh == 0) {
- GC_new_hblk(sz, kind);
- }
- if (*flh == 0) {
- ENTER_GC();
- if (!GC_collect_or_expand((word)1,FALSE)) {
- EXIT_GC();
- return(0);
- }
- EXIT_GC();
- }
- }
-
- return(*flh);
-}
projects / msp430-gcc.git / blobdiff