2 * sgen-gc.c: Simple generational GC.
5 * Paolo Molaro (lupus@ximian.com)
6 * Rodrigo Kumpera (kumpera@gmail.com)
8 * Copyright 2005-2011 Novell, Inc (http://www.novell.com)
9 * Copyright 2011 Xamarin Inc (http://www.xamarin.com)
11 * Thread start/stop adapted from Boehm's GC:
12 * Copyright (c) 1994 by Xerox Corporation. All rights reserved.
13 * Copyright (c) 1996 by Silicon Graphics. All rights reserved.
14 * Copyright (c) 1998 by Fergus Henderson. All rights reserved.
15 * Copyright (c) 2000-2004 by Hewlett-Packard Company. All rights reserved.
16 * Copyright 2001-2003 Ximian, Inc
17 * Copyright 2003-2010 Novell, Inc.
18 * Copyright 2011 Xamarin, Inc.
19 * Copyright (C) 2012 Xamarin Inc
21 * This library is free software; you can redistribute it and/or
22 * modify it under the terms of the GNU Library General Public
23 * License 2.0 as published by the Free Software Foundation;
25 * This library is distributed in the hope that it will be useful,
26 * but WITHOUT ANY WARRANTY; without even the implied warranty of
27 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
28 * Library General Public License for more details.
30 * You should have received a copy of the GNU Library General Public
31 * License 2.0 along with this library; if not, write to the Free
32 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
34 * Important: allocation provides always zeroed memory, having to do
35 * a memset after allocation is deadly for performance.
36 * Memory usage at startup is currently as follows:
38 * 64 KB internal space
40 * We should provide a small memory config with half the sizes
42 * We currently try to make as few mono assumptions as possible:
43 * 1) 2-word header with no GC pointers in it (first vtable, second to store the
45 * 2) gc descriptor is the second word in the vtable (first word in the class)
46 * 3) 8 byte alignment is the minimum and enough (not true for special structures (SIMD), FIXME)
47 * 4) there is a function to get an object's size and the number of
48 * elements in an array.
49 * 5) we know the special way bounds are allocated for complex arrays
50 * 6) we know about proxies and how to treat them when domains are unloaded
52 * Always try to keep stack usage to a minimum: no recursive behaviour
53 * and no large stack allocs.
55 * General description.
56 * Objects are initially allocated in a nursery using a fast bump-pointer technique.
57 * When the nursery is full we start a nursery collection: this is performed with a
59 * When the old generation is full we start a copying GC of the old generation as well:
60 * this will be changed to mark&sweep with copying when fragmentation becomes to severe
61 * in the future. Maybe we'll even do both during the same collection like IMMIX.
63 * The things that complicate this description are:
64 * *) pinned objects: we can't move them so we need to keep track of them
65 * *) no precise info of the thread stacks and registers: we need to be able to
66 * quickly find the objects that may be referenced conservatively and pin them
67 * (this makes the first issues more important)
68 * *) large objects are too expensive to be dealt with using copying GC: we handle them
69 * with mark/sweep during major collections
70 * *) some objects need to not move even if they are small (interned strings, Type handles):
71 * we use mark/sweep for them, too: they are not allocated in the nursery, but inside
72 * PinnedChunks regions
78 *) we could have a function pointer in MonoClass to implement
79 customized write barriers for value types
81 *) investigate the stuff needed to advance a thread to a GC-safe
82 point (single-stepping, read from unmapped memory etc) and implement it.
83 This would enable us to inline allocations and write barriers, for example,
84 or at least parts of them, like the write barrier checks.
85 We may need this also for handling precise info on stacks, even simple things
86 as having uninitialized data on the stack and having to wait for the prolog
87 to zero it. Not an issue for the last frame that we scan conservatively.
88 We could always not trust the value in the slots anyway.
90 *) modify the jit to save info about references in stack locations:
91 this can be done just for locals as a start, so that at least
92 part of the stack is handled precisely.
94 *) test/fix endianess issues
96 *) Implement a card table as the write barrier instead of remembered
97 sets? Card tables are not easy to implement with our current
98 memory layout. We have several different kinds of major heap
99 objects: Small objects in regular blocks, small objects in pinned
100 chunks and LOS objects. If we just have a pointer we have no way
101 to tell which kind of object it points into, therefore we cannot
102 know where its card table is. The least we have to do to make
103 this happen is to get rid of write barriers for indirect stores.
106 *) Get rid of write barriers for indirect stores. We can do this by
107 telling the GC to wbarrier-register an object once we do an ldloca
108 or ldelema on it, and to unregister it once it's not used anymore
109 (it can only travel downwards on the stack). The problem with
110 unregistering is that it needs to happen eventually no matter
111 what, even if exceptions are thrown, the thread aborts, etc.
112 Rodrigo suggested that we could do only the registering part and
113 let the collector find out (pessimistically) when it's safe to
114 unregister, namely when the stack pointer of the thread that
115 registered the object is higher than it was when the registering
116 happened. This might make for a good first implementation to get
117 some data on performance.
119 *) Some sort of blacklist support? Blacklists is a concept from the
120 Boehm GC: if during a conservative scan we find pointers to an
121 area which we might use as heap, we mark that area as unusable, so
122 pointer retention by random pinning pointers is reduced.
124 *) experiment with max small object size (very small right now - 2kb,
125 because it's tied to the max freelist size)
127 *) add an option to mmap the whole heap in one chunk: it makes for many
128 simplifications in the checks (put the nursery at the top and just use a single
129 check for inclusion/exclusion): the issue this has is that on 32 bit systems it's
130 not flexible (too much of the address space may be used by default or we can't
131 increase the heap as needed) and we'd need a race-free mechanism to return memory
132 back to the system (mprotect(PROT_NONE) will still keep the memory allocated if it
133 was written to, munmap is needed, but the following mmap may not find the same segment
136 *) memzero the major fragments after restarting the world and optionally a smaller
139 *) investigate having fragment zeroing threads
141 *) separate locks for finalization and other minor stuff to reduce
144 *) try a different copying order to improve memory locality
146 *) a thread abort after a store but before the write barrier will
147 prevent the write barrier from executing
149 *) specialized dynamically generated markers/copiers
151 *) Dynamically adjust TLAB size to the number of threads. If we have
152 too many threads that do allocation, we might need smaller TLABs,
153 and we might get better performance with larger TLABs if we only
154 have a handful of threads. We could sum up the space left in all
155 assigned TLABs and if that's more than some percentage of the
156 nursery size, reduce the TLAB size.
158 *) Explore placing unreachable objects on unused nursery memory.
159 Instead of memset'ng a region to zero, place an int[] covering it.
160 A good place to start is add_nursery_frag. The tricky thing here is
161 placing those objects atomically outside of a collection.
163 *) Allocation should use asymmetric Dekker synchronization:
164 http://blogs.oracle.com/dave/resource/Asymmetric-Dekker-Synchronization.txt
165 This should help weak consistency archs.
172 #define _XOPEN_SOURCE
173 #define _DARWIN_C_SOURCE
179 #ifdef HAVE_PTHREAD_H
182 #ifdef HAVE_SEMAPHORE_H
183 #include <semaphore.h>
191 #include "metadata/sgen-gc.h"
192 #include "metadata/metadata-internals.h"
193 #include "metadata/class-internals.h"
194 #include "metadata/gc-internal.h"
195 #include "metadata/object-internals.h"
196 #include "metadata/threads.h"
197 #include "metadata/sgen-cardtable.h"
198 #include "metadata/sgen-ssb.h"
199 #include "metadata/sgen-protocol.h"
200 #include "metadata/sgen-archdep.h"
201 #include "metadata/sgen-bridge.h"
202 #include "metadata/sgen-memory-governor.h"
203 #include "metadata/sgen-hash-table.h"
204 #include "metadata/mono-gc.h"
205 #include "metadata/method-builder.h"
206 #include "metadata/profiler-private.h"
207 #include "metadata/monitor.h"
208 #include "metadata/threadpool-internals.h"
209 #include "metadata/mempool-internals.h"
210 #include "metadata/marshal.h"
211 #include "metadata/runtime.h"
212 #include "metadata/sgen-cardtable.h"
213 #include "metadata/sgen-pinning.h"
214 #include "metadata/sgen-workers.h"
215 #include "utils/mono-mmap.h"
216 #include "utils/mono-time.h"
217 #include "utils/mono-semaphore.h"
218 #include "utils/mono-counters.h"
219 #include "utils/mono-proclib.h"
220 #include "utils/mono-memory-model.h"
221 #include "utils/mono-logger-internal.h"
222 #include "utils/dtrace.h"
224 #include <mono/utils/mono-logger-internal.h>
225 #include <mono/utils/memcheck.h>
227 #if defined(__MACH__)
228 #include "utils/mach-support.h"
231 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
235 #include "mono/cil/opcode.def"
241 #undef pthread_create
243 #undef pthread_detach
246 * ######################################################################
247 * ######## Types and constants used by the GC.
248 * ######################################################################
251 /* 0 means not initialized, 1 is initialized, -1 means in progress */
252 static int gc_initialized = 0;
253 /* If set, check if we need to do something every X allocations */
254 gboolean has_per_allocation_action;
255 /* If set, do a heap check every X allocation */
256 guint32 verify_before_allocs = 0;
257 /* If set, do a minor collection before every X allocation */
258 guint32 collect_before_allocs = 0;
259 /* If set, do a whole heap check before each collection */
260 static gboolean whole_heap_check_before_collection = FALSE;
261 /* If set, do a heap consistency check before each minor collection */
262 static gboolean consistency_check_at_minor_collection = FALSE;
263 /* If set, check whether mark bits are consistent after major collections */
264 static gboolean check_mark_bits_after_major_collection = FALSE;
265 /* If set, check that all nursery objects are pinned/not pinned, depending on context */
266 static gboolean check_nursery_objects_pinned = FALSE;
267 /* If set, do a few checks when the concurrent collector is used */
268 static gboolean do_concurrent_checks = FALSE;
269 /* If set, check that there are no references to the domain left at domain unload */
270 static gboolean xdomain_checks = FALSE;
271 /* If not null, dump the heap after each collection into this file */
272 static FILE *heap_dump_file = NULL;
273 /* If set, mark stacks conservatively, even if precise marking is possible */
274 static gboolean conservative_stack_mark = FALSE;
275 /* If set, do a plausibility check on the scan_starts before and after
277 static gboolean do_scan_starts_check = FALSE;
278 static gboolean nursery_collection_is_parallel = FALSE;
279 static gboolean disable_minor_collections = FALSE;
280 static gboolean disable_major_collections = FALSE;
281 gboolean do_pin_stats = FALSE;
282 static gboolean do_verify_nursery = FALSE;
283 static gboolean do_dump_nursery_content = FALSE;
285 #ifdef HEAVY_STATISTICS
286 long long stat_objects_alloced_degraded = 0;
287 long long stat_bytes_alloced_degraded = 0;
289 long long stat_copy_object_called_nursery = 0;
290 long long stat_objects_copied_nursery = 0;
291 long long stat_copy_object_called_major = 0;
292 long long stat_objects_copied_major = 0;
294 long long stat_scan_object_called_nursery = 0;
295 long long stat_scan_object_called_major = 0;
297 long long stat_slots_allocated_in_vain;
299 long long stat_nursery_copy_object_failed_from_space = 0;
300 long long stat_nursery_copy_object_failed_forwarded = 0;
301 long long stat_nursery_copy_object_failed_pinned = 0;
302 long long stat_nursery_copy_object_failed_to_space = 0;
304 static int stat_wbarrier_set_field = 0;
305 static int stat_wbarrier_set_arrayref = 0;
306 static int stat_wbarrier_arrayref_copy = 0;
307 static int stat_wbarrier_generic_store = 0;
308 static int stat_wbarrier_set_root = 0;
309 static int stat_wbarrier_value_copy = 0;
310 static int stat_wbarrier_object_copy = 0;
313 int stat_minor_gcs = 0;
314 int stat_major_gcs = 0;
316 static long long stat_pinned_objects = 0;
318 static long long time_minor_pre_collection_fragment_clear = 0;
319 static long long time_minor_pinning = 0;
320 static long long time_minor_scan_remsets = 0;
321 static long long time_minor_scan_pinned = 0;
322 static long long time_minor_scan_registered_roots = 0;
323 static long long time_minor_scan_thread_data = 0;
324 static long long time_minor_finish_gray_stack = 0;
325 static long long time_minor_fragment_creation = 0;
327 static long long time_major_pre_collection_fragment_clear = 0;
328 static long long time_major_pinning = 0;
329 static long long time_major_scan_pinned = 0;
330 static long long time_major_scan_registered_roots = 0;
331 static long long time_major_scan_thread_data = 0;
332 static long long time_major_scan_alloc_pinned = 0;
333 static long long time_major_scan_finalized = 0;
334 static long long time_major_scan_big_objects = 0;
335 static long long time_major_finish_gray_stack = 0;
336 static long long time_major_free_bigobjs = 0;
337 static long long time_major_los_sweep = 0;
338 static long long time_major_sweep = 0;
339 static long long time_major_fragment_creation = 0;
341 int gc_debug_level = 0;
346 mono_gc_flush_info (void)
348 fflush (gc_debug_file);
352 #define TV_DECLARE SGEN_TV_DECLARE
353 #define TV_GETTIME SGEN_TV_GETTIME
354 #define TV_ELAPSED SGEN_TV_ELAPSED
355 #define TV_ELAPSED_MS SGEN_TV_ELAPSED_MS
357 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
359 NurseryClearPolicy nursery_clear_policy = CLEAR_AT_TLAB_CREATION;
361 #define object_is_forwarded SGEN_OBJECT_IS_FORWARDED
362 #define object_is_pinned SGEN_OBJECT_IS_PINNED
363 #define pin_object SGEN_PIN_OBJECT
364 #define unpin_object SGEN_UNPIN_OBJECT
366 #define ptr_in_nursery sgen_ptr_in_nursery
368 #define LOAD_VTABLE SGEN_LOAD_VTABLE
371 safe_name (void* obj)
373 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (obj);
374 return vt->klass->name;
377 #define safe_object_get_size sgen_safe_object_get_size
380 sgen_safe_name (void* obj)
382 return safe_name (obj);
386 * ######################################################################
387 * ######## Global data.
388 * ######################################################################
390 LOCK_DECLARE (gc_mutex);
391 static int gc_disabled = 0;
393 static gboolean use_cardtable;
395 #define SCAN_START_SIZE SGEN_SCAN_START_SIZE
397 static mword pagesize = 4096;
398 int degraded_mode = 0;
400 static mword bytes_pinned_from_failed_allocation = 0;
402 GCMemSection *nursery_section = NULL;
403 static mword lowest_heap_address = ~(mword)0;
404 static mword highest_heap_address = 0;
406 LOCK_DECLARE (sgen_interruption_mutex);
407 static LOCK_DECLARE (pin_queue_mutex);
409 #define LOCK_PIN_QUEUE mono_mutex_lock (&pin_queue_mutex)
410 #define UNLOCK_PIN_QUEUE mono_mutex_unlock (&pin_queue_mutex)
412 typedef struct _FinalizeReadyEntry FinalizeReadyEntry;
413 struct _FinalizeReadyEntry {
414 FinalizeReadyEntry *next;
418 typedef struct _EphemeronLinkNode EphemeronLinkNode;
420 struct _EphemeronLinkNode {
421 EphemeronLinkNode *next;
430 int current_collection_generation = -1;
431 volatile gboolean concurrent_collection_in_progress = FALSE;
433 /* objects that are ready to be finalized */
434 static FinalizeReadyEntry *fin_ready_list = NULL;
435 static FinalizeReadyEntry *critical_fin_list = NULL;
437 static EphemeronLinkNode *ephemeron_list;
439 /* registered roots: the key to the hash is the root start address */
441 * Different kinds of roots are kept separate to speed up pin_from_roots () for example.
443 SgenHashTable roots_hash [ROOT_TYPE_NUM] = {
444 SGEN_HASH_TABLE_INIT (INTERNAL_MEM_ROOTS_TABLE, INTERNAL_MEM_ROOT_RECORD, sizeof (RootRecord), mono_aligned_addr_hash, NULL),
445 SGEN_HASH_TABLE_INIT (INTERNAL_MEM_ROOTS_TABLE, INTERNAL_MEM_ROOT_RECORD, sizeof (RootRecord), mono_aligned_addr_hash, NULL),
446 SGEN_HASH_TABLE_INIT (INTERNAL_MEM_ROOTS_TABLE, INTERNAL_MEM_ROOT_RECORD, sizeof (RootRecord), mono_aligned_addr_hash, NULL)
448 static mword roots_size = 0; /* amount of memory in the root set */
450 #define GC_ROOT_NUM 32
452 int count; /* must be the first field */
453 void *objects [GC_ROOT_NUM];
454 int root_types [GC_ROOT_NUM];
455 uintptr_t extra_info [GC_ROOT_NUM];
459 notify_gc_roots (GCRootReport *report)
463 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
468 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
470 if (report->count == GC_ROOT_NUM)
471 notify_gc_roots (report);
472 report->objects [report->count] = object;
473 report->root_types [report->count] = rtype;
474 report->extra_info [report->count++] = (uintptr_t)((MonoVTable*)LOAD_VTABLE (object))->klass;
477 MonoNativeTlsKey thread_info_key;
479 #ifdef HAVE_KW_THREAD
480 __thread SgenThreadInfo *sgen_thread_info;
481 __thread gpointer *store_remset_buffer;
482 __thread long store_remset_buffer_index;
483 __thread char *stack_end;
484 __thread long *store_remset_buffer_index_addr;
487 /* The size of a TLAB */
488 /* The bigger the value, the less often we have to go to the slow path to allocate a new
489 * one, but the more space is wasted by threads not allocating much memory.
491 * FIXME: Make this self-tuning for each thread.
493 guint32 tlab_size = (1024 * 4);
495 #define MAX_SMALL_OBJ_SIZE SGEN_MAX_SMALL_OBJ_SIZE
497 /* Functions supplied by the runtime to be called by the GC */
498 static MonoGCCallbacks gc_callbacks;
500 #define ALLOC_ALIGN SGEN_ALLOC_ALIGN
501 #define ALLOC_ALIGN_BITS SGEN_ALLOC_ALIGN_BITS
503 #define ALIGN_UP SGEN_ALIGN_UP
505 #define MOVED_OBJECTS_NUM 64
506 static void *moved_objects [MOVED_OBJECTS_NUM];
507 static int moved_objects_idx = 0;
509 /* Vtable of the objects used to fill out nursery fragments before a collection */
510 static MonoVTable *array_fill_vtable;
512 #ifdef SGEN_DEBUG_INTERNAL_ALLOC
513 MonoNativeThreadId main_gc_thread = NULL;
516 /*Object was pinned during the current collection*/
517 static mword objects_pinned;
520 * ######################################################################
521 * ######## Macros and function declarations.
522 * ######################################################################
526 align_pointer (void *ptr)
528 mword p = (mword)ptr;
529 p += sizeof (gpointer) - 1;
530 p &= ~ (sizeof (gpointer) - 1);
534 typedef SgenGrayQueue GrayQueue;
536 /* forward declarations */
537 static void scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, GrayQueue *queue);
538 static void scan_from_registered_roots (char *addr_start, char *addr_end, int root_type, ScanCopyContext ctx);
539 static void scan_finalizer_entries (FinalizeReadyEntry *list, ScanCopyContext ctx);
540 static void report_finalizer_roots (void);
541 static void report_registered_roots (void);
543 static void pin_from_roots (void *start_nursery, void *end_nursery, GrayQueue *queue);
544 static int pin_objects_from_addresses (GCMemSection *section, void **start, void **end, void *start_nursery, void *end_nursery, ScanCopyContext ctx);
545 static void finish_gray_stack (char *start_addr, char *end_addr, int generation, GrayQueue *queue);
547 void mono_gc_scan_for_specific_ref (MonoObject *key, gboolean precise);
550 static void init_stats (void);
552 static int mark_ephemerons_in_range (ScanCopyContext ctx);
553 static void clear_unreachable_ephemerons (gboolean concurrent_cementing, ScanCopyContext ctx);
554 static void null_ephemerons_for_domain (MonoDomain *domain);
556 static gboolean major_update_or_finish_concurrent_collection (gboolean force_finish);
558 SgenObjectOperations current_object_ops;
559 SgenMajorCollector major_collector;
560 SgenMinorCollector sgen_minor_collector;
561 static GrayQueue gray_queue;
562 static GrayQueue remember_major_objects_gray_queue;
564 static SgenRemeberedSet remset;
566 /* The gray queue to use from the main collection thread. */
567 #define WORKERS_DISTRIBUTE_GRAY_QUEUE (&gray_queue)
570 * The gray queue a worker job must use. If we're not parallel or
571 * concurrent, we use the main gray queue.
573 static SgenGrayQueue*
574 sgen_workers_get_job_gray_queue (WorkerData *worker_data)
576 return worker_data ? &worker_data->private_gray_queue : WORKERS_DISTRIBUTE_GRAY_QUEUE;
579 static gboolean have_non_collection_major_object_remembers = FALSE;
582 sgen_remember_major_object_for_concurrent_mark (char *obj)
584 if (!major_collector.is_concurrent)
587 g_assert (current_collection_generation == GENERATION_NURSERY || current_collection_generation == -1);
589 if (!concurrent_collection_in_progress)
592 GRAY_OBJECT_ENQUEUE (&remember_major_objects_gray_queue, obj);
594 if (current_collection_generation != GENERATION_NURSERY) {
596 * This happens when the mutator allocates large or
597 * pinned objects or when allocating in degraded
600 have_non_collection_major_object_remembers = TRUE;
607 gray_queue_redirect (SgenGrayQueue *queue)
609 gboolean wake = FALSE;
613 GrayQueueSection *section = sgen_gray_object_dequeue_section (queue);
616 sgen_section_gray_queue_enqueue (queue->alloc_prepare_data, section);
621 g_assert (concurrent_collection_in_progress ||
622 (current_collection_generation == GENERATION_OLD && major_collector.is_parallel));
623 if (sgen_workers_have_started ()) {
624 sgen_workers_wake_up_all ();
626 if (concurrent_collection_in_progress)
627 g_assert (current_collection_generation == -1);
633 redirect_major_object_remembers (void)
635 gray_queue_redirect (&remember_major_objects_gray_queue);
636 have_non_collection_major_object_remembers = FALSE;
640 is_xdomain_ref_allowed (gpointer *ptr, char *obj, MonoDomain *domain)
642 MonoObject *o = (MonoObject*)(obj);
643 MonoObject *ref = (MonoObject*)*(ptr);
644 int offset = (char*)(ptr) - (char*)o;
646 if (o->vtable->klass == mono_defaults.thread_class && offset == G_STRUCT_OFFSET (MonoThread, internal_thread))
648 if (o->vtable->klass == mono_defaults.internal_thread_class && offset == G_STRUCT_OFFSET (MonoInternalThread, current_appcontext))
650 if (mono_class_has_parent_fast (o->vtable->klass, mono_defaults.real_proxy_class) &&
651 offset == G_STRUCT_OFFSET (MonoRealProxy, unwrapped_server))
653 /* Thread.cached_culture_info */
654 if (!strcmp (ref->vtable->klass->name_space, "System.Globalization") &&
655 !strcmp (ref->vtable->klass->name, "CultureInfo") &&
656 !strcmp(o->vtable->klass->name_space, "System") &&
657 !strcmp(o->vtable->klass->name, "Object[]"))
660 * at System.IO.MemoryStream.InternalConstructor (byte[],int,int,bool,bool) [0x0004d] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.IO/MemoryStream.cs:121
661 * at System.IO.MemoryStream..ctor (byte[]) [0x00017] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.IO/MemoryStream.cs:81
662 * at (wrapper remoting-invoke-with-check) System.IO.MemoryStream..ctor (byte[]) <IL 0x00020, 0xffffffff>
663 * at System.Runtime.Remoting.Messaging.CADMethodCallMessage.GetArguments () [0x0000d] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Messaging/CADMessages.cs:327
664 * at System.Runtime.Remoting.Messaging.MethodCall..ctor (System.Runtime.Remoting.Messaging.CADMethodCallMessage) [0x00017] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Messaging/MethodCall.cs:87
665 * at System.AppDomain.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage,byte[]&,System.Runtime.Remoting.Messaging.CADMethodReturnMessage&) [0x00018] in /home/schani/Work/novell/trunk/mcs/class/corlib/System/AppDomain.cs:1213
666 * at (wrapper remoting-invoke-with-check) System.AppDomain.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage,byte[]&,System.Runtime.Remoting.Messaging.CADMethodReturnMessage&) <IL 0x0003d, 0xffffffff>
667 * at System.Runtime.Remoting.Channels.CrossAppDomainSink.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage) [0x00008] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Channels/CrossAppDomainChannel.cs:198
668 * at (wrapper runtime-invoke) object.runtime_invoke_CrossAppDomainSink/ProcessMessageRes_object_object (object,intptr,intptr,intptr) <IL 0x0004c, 0xffffffff>
670 if (!strcmp (ref->vtable->klass->name_space, "System") &&
671 !strcmp (ref->vtable->klass->name, "Byte[]") &&
672 !strcmp (o->vtable->klass->name_space, "System.IO") &&
673 !strcmp (o->vtable->klass->name, "MemoryStream"))
675 /* append_job() in threadpool.c */
676 if (!strcmp (ref->vtable->klass->name_space, "System.Runtime.Remoting.Messaging") &&
677 !strcmp (ref->vtable->klass->name, "AsyncResult") &&
678 !strcmp (o->vtable->klass->name_space, "System") &&
679 !strcmp (o->vtable->klass->name, "Object[]") &&
680 mono_thread_pool_is_queue_array ((MonoArray*) o))
686 check_reference_for_xdomain (gpointer *ptr, char *obj, MonoDomain *domain)
688 MonoObject *o = (MonoObject*)(obj);
689 MonoObject *ref = (MonoObject*)*(ptr);
690 int offset = (char*)(ptr) - (char*)o;
692 MonoClassField *field;
695 if (!ref || ref->vtable->domain == domain)
697 if (is_xdomain_ref_allowed (ptr, obj, domain))
701 for (class = o->vtable->klass; class; class = class->parent) {
704 for (i = 0; i < class->field.count; ++i) {
705 if (class->fields[i].offset == offset) {
706 field = &class->fields[i];
714 if (ref->vtable->klass == mono_defaults.string_class)
715 str = mono_string_to_utf8 ((MonoString*)ref);
718 g_print ("xdomain reference in %p (%s.%s) at offset %d (%s) to %p (%s.%s) (%s) - pointed to by:\n",
719 o, o->vtable->klass->name_space, o->vtable->klass->name,
720 offset, field ? field->name : "",
721 ref, ref->vtable->klass->name_space, ref->vtable->klass->name, str ? str : "");
722 mono_gc_scan_for_specific_ref (o, TRUE);
728 #define HANDLE_PTR(ptr,obj) check_reference_for_xdomain ((ptr), (obj), domain)
731 scan_object_for_xdomain_refs (char *start, mword size, void *data)
733 MonoDomain *domain = ((MonoObject*)start)->vtable->domain;
735 #include "sgen-scan-object.h"
738 static gboolean scan_object_for_specific_ref_precise = TRUE;
741 #define HANDLE_PTR(ptr,obj) do { \
742 if ((MonoObject*)*(ptr) == key) { \
743 g_print ("found ref to %p in object %p (%s) at offset %td\n", \
744 key, (obj), safe_name ((obj)), ((char*)(ptr) - (char*)(obj))); \
749 scan_object_for_specific_ref (char *start, MonoObject *key)
753 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (start)))
756 if (scan_object_for_specific_ref_precise) {
757 #include "sgen-scan-object.h"
759 mword *words = (mword*)start;
760 size_t size = safe_object_get_size ((MonoObject*)start);
762 for (i = 0; i < size / sizeof (mword); ++i) {
763 if (words [i] == (mword)key) {
764 g_print ("found possible ref to %p in object %p (%s) at offset %td\n",
765 key, start, safe_name (start), i * sizeof (mword));
772 sgen_scan_area_with_callback (char *start, char *end, IterateObjectCallbackFunc callback, void *data, gboolean allow_flags)
774 while (start < end) {
778 if (!*(void**)start) {
779 start += sizeof (void*); /* should be ALLOC_ALIGN, really */
784 if (!(obj = SGEN_OBJECT_IS_FORWARDED (start)))
790 size = ALIGN_UP (safe_object_get_size ((MonoObject*)obj));
792 if ((MonoVTable*)SGEN_LOAD_VTABLE (obj) != array_fill_vtable)
793 callback (obj, size, data);
800 scan_object_for_specific_ref_callback (char *obj, size_t size, MonoObject *key)
802 scan_object_for_specific_ref (obj, key);
806 check_root_obj_specific_ref (RootRecord *root, MonoObject *key, MonoObject *obj)
810 g_print ("found ref to %p in root record %p\n", key, root);
813 static MonoObject *check_key = NULL;
814 static RootRecord *check_root = NULL;
817 check_root_obj_specific_ref_from_marker (void **obj)
819 check_root_obj_specific_ref (check_root, check_key, *obj);
823 scan_roots_for_specific_ref (MonoObject *key, int root_type)
829 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
830 mword desc = root->root_desc;
834 switch (desc & ROOT_DESC_TYPE_MASK) {
835 case ROOT_DESC_BITMAP:
836 desc >>= ROOT_DESC_TYPE_SHIFT;
839 check_root_obj_specific_ref (root, key, *start_root);
844 case ROOT_DESC_COMPLEX: {
845 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
846 int bwords = (*bitmap_data) - 1;
847 void **start_run = start_root;
849 while (bwords-- > 0) {
850 gsize bmap = *bitmap_data++;
851 void **objptr = start_run;
854 check_root_obj_specific_ref (root, key, *objptr);
858 start_run += GC_BITS_PER_WORD;
862 case ROOT_DESC_USER: {
863 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
864 marker (start_root, check_root_obj_specific_ref_from_marker);
867 case ROOT_DESC_RUN_LEN:
868 g_assert_not_reached ();
870 g_assert_not_reached ();
872 } SGEN_HASH_TABLE_FOREACH_END;
879 mono_gc_scan_for_specific_ref (MonoObject *key, gboolean precise)
884 scan_object_for_specific_ref_precise = precise;
886 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
887 (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key, TRUE);
889 major_collector.iterate_objects (TRUE, TRUE, (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
891 sgen_los_iterate_objects ((IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
893 scan_roots_for_specific_ref (key, ROOT_TYPE_NORMAL);
894 scan_roots_for_specific_ref (key, ROOT_TYPE_WBARRIER);
896 SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_PINNED], ptr, root) {
897 while (ptr < (void**)root->end_root) {
898 check_root_obj_specific_ref (root, *ptr, key);
901 } SGEN_HASH_TABLE_FOREACH_END;
905 need_remove_object_for_domain (char *start, MonoDomain *domain)
907 if (mono_object_domain (start) == domain) {
908 SGEN_LOG (4, "Need to cleanup object %p", start);
909 binary_protocol_cleanup (start, (gpointer)LOAD_VTABLE (start), safe_object_get_size ((MonoObject*)start));
916 process_object_for_domain_clearing (char *start, MonoDomain *domain)
918 GCVTable *vt = (GCVTable*)LOAD_VTABLE (start);
919 if (vt->klass == mono_defaults.internal_thread_class)
920 g_assert (mono_object_domain (start) == mono_get_root_domain ());
921 /* The object could be a proxy for an object in the domain
923 if (mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
924 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
926 /* The server could already have been zeroed out, so
927 we need to check for that, too. */
928 if (server && (!LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
929 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
930 ((MonoRealProxy*)start)->unwrapped_server = NULL;
935 static MonoDomain *check_domain = NULL;
938 check_obj_not_in_domain (void **o)
940 g_assert (((MonoObject*)(*o))->vtable->domain != check_domain);
944 scan_for_registered_roots_in_domain (MonoDomain *domain, int root_type)
948 check_domain = domain;
949 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
950 mword desc = root->root_desc;
952 /* The MonoDomain struct is allowed to hold
953 references to objects in its own domain. */
954 if (start_root == (void**)domain)
957 switch (desc & ROOT_DESC_TYPE_MASK) {
958 case ROOT_DESC_BITMAP:
959 desc >>= ROOT_DESC_TYPE_SHIFT;
961 if ((desc & 1) && *start_root)
962 check_obj_not_in_domain (*start_root);
967 case ROOT_DESC_COMPLEX: {
968 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
969 int bwords = (*bitmap_data) - 1;
970 void **start_run = start_root;
972 while (bwords-- > 0) {
973 gsize bmap = *bitmap_data++;
974 void **objptr = start_run;
976 if ((bmap & 1) && *objptr)
977 check_obj_not_in_domain (*objptr);
981 start_run += GC_BITS_PER_WORD;
985 case ROOT_DESC_USER: {
986 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
987 marker (start_root, check_obj_not_in_domain);
990 case ROOT_DESC_RUN_LEN:
991 g_assert_not_reached ();
993 g_assert_not_reached ();
995 } SGEN_HASH_TABLE_FOREACH_END;
1001 check_for_xdomain_refs (void)
1005 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
1006 (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL, FALSE);
1008 major_collector.iterate_objects (TRUE, TRUE, (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL);
1010 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
1011 scan_object_for_xdomain_refs (bigobj->data, sgen_los_object_size (bigobj), NULL);
1015 clear_domain_process_object (char *obj, MonoDomain *domain)
1019 process_object_for_domain_clearing (obj, domain);
1020 remove = need_remove_object_for_domain (obj, domain);
1022 if (remove && ((MonoObject*)obj)->synchronisation) {
1023 void **dislink = mono_monitor_get_object_monitor_weak_link ((MonoObject*)obj);
1025 sgen_register_disappearing_link (NULL, dislink, FALSE, TRUE);
1032 clear_domain_process_minor_object_callback (char *obj, size_t size, MonoDomain *domain)
1034 if (clear_domain_process_object (obj, domain))
1035 memset (obj, 0, size);
1039 clear_domain_process_major_object_callback (char *obj, size_t size, MonoDomain *domain)
1041 clear_domain_process_object (obj, domain);
1045 clear_domain_free_major_non_pinned_object_callback (char *obj, size_t size, MonoDomain *domain)
1047 if (need_remove_object_for_domain (obj, domain))
1048 major_collector.free_non_pinned_object (obj, size);
1052 clear_domain_free_major_pinned_object_callback (char *obj, size_t size, MonoDomain *domain)
1054 if (need_remove_object_for_domain (obj, domain))
1055 major_collector.free_pinned_object (obj, size);
1059 * When appdomains are unloaded we can easily remove objects that have finalizers,
1060 * but all the others could still be present in random places on the heap.
1061 * We need a sweep to get rid of them even though it's going to be costly
1063 * The reason we need to remove them is because we access the vtable and class
1064 * structures to know the object size and the reference bitmap: once the domain is
1065 * unloaded the point to random memory.
1068 mono_gc_clear_domain (MonoDomain * domain)
1070 LOSObject *bigobj, *prev;
1075 if (concurrent_collection_in_progress)
1076 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE);
1077 g_assert (!concurrent_collection_in_progress);
1079 sgen_process_fin_stage_entries ();
1080 sgen_process_dislink_stage_entries ();
1082 sgen_clear_nursery_fragments ();
1084 if (xdomain_checks && domain != mono_get_root_domain ()) {
1085 scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
1086 scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
1087 check_for_xdomain_refs ();
1090 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
1091 to memory returned to the OS.*/
1092 null_ephemerons_for_domain (domain);
1094 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
1095 sgen_null_links_for_domain (domain, i);
1097 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
1098 sgen_remove_finalizers_for_domain (domain, i);
1100 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
1101 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE);
1103 /* We need two passes over major and large objects because
1104 freeing such objects might give their memory back to the OS
1105 (in the case of large objects) or obliterate its vtable
1106 (pinned objects with major-copying or pinned and non-pinned
1107 objects with major-mark&sweep), but we might need to
1108 dereference a pointer from an object to another object if
1109 the first object is a proxy. */
1110 major_collector.iterate_objects (TRUE, TRUE, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
1111 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
1112 clear_domain_process_object (bigobj->data, domain);
1115 for (bigobj = los_object_list; bigobj;) {
1116 if (need_remove_object_for_domain (bigobj->data, domain)) {
1117 LOSObject *to_free = bigobj;
1119 prev->next = bigobj->next;
1121 los_object_list = bigobj->next;
1122 bigobj = bigobj->next;
1123 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
1124 sgen_los_free_object (to_free);
1128 bigobj = bigobj->next;
1130 major_collector.iterate_objects (TRUE, FALSE, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
1131 major_collector.iterate_objects (FALSE, TRUE, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
1133 if (G_UNLIKELY (do_pin_stats)) {
1134 if (domain == mono_get_root_domain ())
1135 sgen_pin_stats_print_class_stats ();
1142 * sgen_add_to_global_remset:
1144 * The global remset contains locations which point into newspace after
1145 * a minor collection. This can happen if the objects they point to are pinned.
1147 * LOCKING: If called from a parallel collector, the global remset
1148 * lock must be held. For serial collectors that is not necessary.
1151 sgen_add_to_global_remset (gpointer ptr, gpointer obj, gboolean concurrent_cementing)
1153 SGEN_ASSERT (5, sgen_ptr_in_nursery (obj), "Target pointer of global remset must be in the nursery");
1155 if (!major_collector.is_concurrent) {
1156 SGEN_ASSERT (5, !concurrent_cementing, "Concurrent cementing must only happen with the concurrent collector");
1157 SGEN_ASSERT (5, current_collection_generation != -1, "Global remsets can only be added during collections");
1159 if (current_collection_generation == -1)
1160 SGEN_ASSERT (5, concurrent_cementing, "Global remsets outside of collection pauses can only be added by the concurrent collector");
1161 if (concurrent_cementing)
1162 SGEN_ASSERT (5, concurrent_collection_in_progress, "Concurrent collection must be in process in order to add global remsets");
1165 if (!object_is_pinned (obj))
1166 SGEN_ASSERT (5, concurrent_cementing || sgen_minor_collector.is_split, "Non-pinned objects can only remain in nursery if it is a split nursery");
1167 else if (sgen_cement_lookup_or_register (obj, concurrent_cementing))
1170 remset.record_pointer (ptr);
1172 #ifdef ENABLE_DTRACE
1173 if (G_UNLIKELY (do_pin_stats))
1174 sgen_pin_stats_register_global_remset (obj);
1176 SGEN_LOG (8, "Adding global remset for %p", ptr);
1177 binary_protocol_global_remset (ptr, obj, (gpointer)SGEN_LOAD_VTABLE (obj));
1179 HEAVY_STAT (++stat_global_remsets_added);
1181 if (G_UNLIKELY (MONO_GC_GLOBAL_REMSET_ADD_ENABLED ())) {
1182 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (obj);
1183 MONO_GC_GLOBAL_REMSET_ADD ((mword)ptr, (mword)obj, sgen_safe_object_get_size (obj),
1184 vt->klass->name_space, vt->klass->name);
1190 * sgen_drain_gray_stack:
1192 * Scan objects in the gray stack until the stack is empty. This should be called
1193 * frequently after each object is copied, to achieve better locality and cache
1197 sgen_drain_gray_stack (int max_objs, ScanCopyContext ctx)
1200 ScanObjectFunc scan_func = ctx.scan_func;
1201 GrayQueue *queue = ctx.queue;
1203 if (max_objs == -1) {
1205 GRAY_OBJECT_DEQUEUE (queue, obj);
1208 SGEN_LOG (9, "Precise gray object scan %p (%s)", obj, safe_name (obj));
1209 scan_func (obj, queue);
1215 for (i = 0; i != max_objs; ++i) {
1216 GRAY_OBJECT_DEQUEUE (queue, obj);
1219 SGEN_LOG (9, "Precise gray object scan %p (%s)", obj, safe_name (obj));
1220 scan_func (obj, queue);
1222 } while (max_objs < 0);
1228 * Addresses from start to end are already sorted. This function finds
1229 * the object header for each address and pins the object. The
1230 * addresses must be inside the passed section. The (start of the)
1231 * address array is overwritten with the addresses of the actually
1232 * pinned objects. Return the number of pinned objects.
1235 pin_objects_from_addresses (GCMemSection *section, void **start, void **end, void *start_nursery, void *end_nursery, ScanCopyContext ctx)
1240 void *last_obj = NULL;
1241 size_t last_obj_size = 0;
1244 void **definitely_pinned = start;
1245 ScanObjectFunc scan_func = ctx.scan_func;
1246 SgenGrayQueue *queue = ctx.queue;
1248 sgen_nursery_allocator_prepare_for_pinning ();
1250 while (start < end) {
1252 /* the range check should be reduntant */
1253 if (addr != last && addr >= start_nursery && addr < end_nursery) {
1254 SGEN_LOG (5, "Considering pinning addr %p", addr);
1255 /* multiple pointers to the same object */
1256 if (addr >= last_obj && (char*)addr < (char*)last_obj + last_obj_size) {
1260 idx = ((char*)addr - (char*)section->data) / SCAN_START_SIZE;
1261 g_assert (idx < section->num_scan_start);
1262 search_start = (void*)section->scan_starts [idx];
1263 if (!search_start || search_start > addr) {
1266 search_start = section->scan_starts [idx];
1267 if (search_start && search_start <= addr)
1270 if (!search_start || search_start > addr)
1271 search_start = start_nursery;
1273 if (search_start < last_obj)
1274 search_start = (char*)last_obj + last_obj_size;
1275 /* now addr should be in an object a short distance from search_start
1276 * Note that search_start must point to zeroed mem or point to an object.
1280 if (!*(void**)search_start) {
1281 /* Consistency check */
1283 for (frag = nursery_fragments; frag; frag = frag->next) {
1284 if (search_start >= frag->fragment_start && search_start < frag->fragment_end)
1285 g_assert_not_reached ();
1289 search_start = (void*)ALIGN_UP ((mword)search_start + sizeof (gpointer));
1292 last_obj = search_start;
1293 last_obj_size = ALIGN_UP (safe_object_get_size ((MonoObject*)search_start));
1295 if (((MonoObject*)last_obj)->synchronisation == GINT_TO_POINTER (-1)) {
1296 /* Marks the beginning of a nursery fragment, skip */
1298 SGEN_LOG (8, "Pinned try match %p (%s), size %zd", last_obj, safe_name (last_obj), last_obj_size);
1299 if (addr >= search_start && (char*)addr < (char*)last_obj + last_obj_size) {
1301 scan_func (search_start, queue);
1303 SGEN_LOG (4, "Pinned object %p, vtable %p (%s), count %d\n",
1304 search_start, *(void**)search_start, safe_name (search_start), count);
1305 binary_protocol_pin (search_start,
1306 (gpointer)LOAD_VTABLE (search_start),
1307 safe_object_get_size (search_start));
1309 #ifdef ENABLE_DTRACE
1310 if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
1311 int gen = sgen_ptr_in_nursery (search_start) ? GENERATION_NURSERY : GENERATION_OLD;
1312 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (search_start);
1313 MONO_GC_OBJ_PINNED ((mword)search_start,
1314 sgen_safe_object_get_size (search_start),
1315 vt->klass->name_space, vt->klass->name, gen);
1319 pin_object (search_start);
1320 GRAY_OBJECT_ENQUEUE (queue, search_start);
1321 if (G_UNLIKELY (do_pin_stats))
1322 sgen_pin_stats_register_object (search_start, last_obj_size);
1323 definitely_pinned [count] = search_start;
1329 /* skip to the next object */
1330 search_start = (void*)((char*)search_start + last_obj_size);
1331 } while (search_start <= addr);
1332 /* we either pinned the correct object or we ignored the addr because
1333 * it points to unused zeroed memory.
1339 //printf ("effective pinned: %d (at the end: %d)\n", count, (char*)end_nursery - (char*)last);
1340 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1341 GCRootReport report;
1343 for (idx = 0; idx < count; ++idx)
1344 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1345 notify_gc_roots (&report);
1347 stat_pinned_objects += count;
1352 sgen_pin_objects_in_section (GCMemSection *section, ScanCopyContext ctx)
1354 int num_entries = section->pin_queue_num_entries;
1356 void **start = section->pin_queue_start;
1358 reduced_to = pin_objects_from_addresses (section, start, start + num_entries,
1359 section->data, section->next_data, ctx);
1360 section->pin_queue_num_entries = reduced_to;
1362 section->pin_queue_start = NULL;
1368 sgen_pin_object (void *object, GrayQueue *queue)
1370 g_assert (!concurrent_collection_in_progress);
1372 if (sgen_collection_is_parallel ()) {
1374 /*object arrives pinned*/
1375 sgen_pin_stage_ptr (object);
1379 SGEN_PIN_OBJECT (object);
1380 sgen_pin_stage_ptr (object);
1382 if (G_UNLIKELY (do_pin_stats))
1383 sgen_pin_stats_register_object (object, safe_object_get_size (object));
1385 GRAY_OBJECT_ENQUEUE (queue, object);
1386 binary_protocol_pin (object, (gpointer)LOAD_VTABLE (object), safe_object_get_size (object));
1388 #ifdef ENABLE_DTRACE
1389 if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
1390 int gen = sgen_ptr_in_nursery (object) ? GENERATION_NURSERY : GENERATION_OLD;
1391 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (object);
1392 MONO_GC_OBJ_PINNED ((mword)object, sgen_safe_object_get_size (object), vt->klass->name_space, vt->klass->name, gen);
1398 sgen_parallel_pin_or_update (void **ptr, void *obj, MonoVTable *vt, SgenGrayQueue *queue)
1402 gboolean major_pinned = FALSE;
1404 if (sgen_ptr_in_nursery (obj)) {
1405 if (SGEN_CAS_PTR (obj, (void*)((mword)vt | SGEN_PINNED_BIT), vt) == vt) {
1406 sgen_pin_object (obj, queue);
1410 major_collector.pin_major_object (obj, queue);
1411 major_pinned = TRUE;
1414 vtable_word = *(mword*)obj;
1415 /*someone else forwarded it, update the pointer and bail out*/
1416 if (vtable_word & SGEN_FORWARDED_BIT) {
1417 *ptr = (void*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1421 /*someone pinned it, nothing to do.*/
1422 if (vtable_word & SGEN_PINNED_BIT || major_pinned)
1427 /* Sort the addresses in array in increasing order.
1428 * Done using a by-the book heap sort. Which has decent and stable performance, is pretty cache efficient.
1431 sgen_sort_addresses (void **array, int size)
1436 for (i = 1; i < size; ++i) {
1439 int parent = (child - 1) / 2;
1441 if (array [parent] >= array [child])
1444 tmp = array [parent];
1445 array [parent] = array [child];
1446 array [child] = tmp;
1452 for (i = size - 1; i > 0; --i) {
1455 array [i] = array [0];
1461 while (root * 2 + 1 <= end) {
1462 int child = root * 2 + 1;
1464 if (child < end && array [child] < array [child + 1])
1466 if (array [root] >= array [child])
1470 array [root] = array [child];
1471 array [child] = tmp;
1479 * Scan the memory between start and end and queue values which could be pointers
1480 * to the area between start_nursery and end_nursery for later consideration.
1481 * Typically used for thread stacks.
1484 conservatively_pin_objects_from (void **start, void **end, void *start_nursery, void *end_nursery, int pin_type)
1488 #ifdef VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE
1489 VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE (start, (char*)end - (char*)start);
1492 while (start < end) {
1493 if (*start >= start_nursery && *start < end_nursery) {
1495 * *start can point to the middle of an object
1496 * note: should we handle pointing at the end of an object?
1497 * pinning in C# code disallows pointing at the end of an object
1498 * but there is some small chance that an optimizing C compiler
1499 * may keep the only reference to an object by pointing
1500 * at the end of it. We ignore this small chance for now.
1501 * Pointers to the end of an object are indistinguishable
1502 * from pointers to the start of the next object in memory
1503 * so if we allow that we'd need to pin two objects...
1504 * We queue the pointer in an array, the
1505 * array will then be sorted and uniqued. This way
1506 * we can coalesce several pinning pointers and it should
1507 * be faster since we'd do a memory scan with increasing
1508 * addresses. Note: we can align the address to the allocation
1509 * alignment, so the unique process is more effective.
1511 mword addr = (mword)*start;
1512 addr &= ~(ALLOC_ALIGN - 1);
1513 if (addr >= (mword)start_nursery && addr < (mword)end_nursery) {
1514 SGEN_LOG (6, "Pinning address %p from %p", (void*)addr, start);
1515 sgen_pin_stage_ptr ((void*)addr);
1518 if (G_UNLIKELY (do_pin_stats)) {
1519 if (ptr_in_nursery ((void*)addr))
1520 sgen_pin_stats_register_address ((char*)addr, pin_type);
1526 SGEN_LOG (7, "found %d potential pinned heap pointers", count);
1530 * The first thing we do in a collection is to identify pinned objects.
1531 * This function considers all the areas of memory that need to be
1532 * conservatively scanned.
1535 pin_from_roots (void *start_nursery, void *end_nursery, GrayQueue *queue)
1539 SGEN_LOG (2, "Scanning pinned roots (%d bytes, %d/%d entries)", (int)roots_size, roots_hash [ROOT_TYPE_NORMAL].num_entries, roots_hash [ROOT_TYPE_PINNED].num_entries);
1540 /* objects pinned from the API are inside these roots */
1541 SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_PINNED], start_root, root) {
1542 SGEN_LOG (6, "Pinned roots %p-%p", start_root, root->end_root);
1543 conservatively_pin_objects_from (start_root, (void**)root->end_root, start_nursery, end_nursery, PIN_TYPE_OTHER);
1544 } SGEN_HASH_TABLE_FOREACH_END;
1545 /* now deal with the thread stacks
1546 * in the future we should be able to conservatively scan only:
1547 * *) the cpu registers
1548 * *) the unmanaged stack frames
1549 * *) the _last_ managed stack frame
1550 * *) pointers slots in managed frames
1552 scan_thread_data (start_nursery, end_nursery, FALSE, queue);
1556 unpin_objects_from_queue (SgenGrayQueue *queue)
1560 GRAY_OBJECT_DEQUEUE (queue, addr);
1563 g_assert (SGEN_OBJECT_IS_PINNED (addr));
1564 SGEN_UNPIN_OBJECT (addr);
1569 CopyOrMarkObjectFunc func;
1571 } UserCopyOrMarkData;
1573 static MonoNativeTlsKey user_copy_or_mark_key;
1576 init_user_copy_or_mark_key (void)
1578 mono_native_tls_alloc (&user_copy_or_mark_key, NULL);
1582 set_user_copy_or_mark_data (UserCopyOrMarkData *data)
1584 mono_native_tls_set_value (user_copy_or_mark_key, data);
1588 single_arg_user_copy_or_mark (void **obj)
1590 UserCopyOrMarkData *data = mono_native_tls_get_value (user_copy_or_mark_key);
1592 data->func (obj, data->queue);
1596 * The memory area from start_root to end_root contains pointers to objects.
1597 * Their position is precisely described by @desc (this means that the pointer
1598 * can be either NULL or the pointer to the start of an object).
1599 * This functions copies them to to_space updates them.
1601 * This function is not thread-safe!
1604 precisely_scan_objects_from (void** start_root, void** end_root, char* n_start, char *n_end, mword desc, ScanCopyContext ctx)
1606 CopyOrMarkObjectFunc copy_func = ctx.copy_func;
1607 SgenGrayQueue *queue = ctx.queue;
1609 switch (desc & ROOT_DESC_TYPE_MASK) {
1610 case ROOT_DESC_BITMAP:
1611 desc >>= ROOT_DESC_TYPE_SHIFT;
1613 if ((desc & 1) && *start_root) {
1614 copy_func (start_root, queue);
1615 SGEN_LOG (9, "Overwrote root at %p with %p", start_root, *start_root);
1616 sgen_drain_gray_stack (-1, ctx);
1622 case ROOT_DESC_COMPLEX: {
1623 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1624 int bwords = (*bitmap_data) - 1;
1625 void **start_run = start_root;
1627 while (bwords-- > 0) {
1628 gsize bmap = *bitmap_data++;
1629 void **objptr = start_run;
1631 if ((bmap & 1) && *objptr) {
1632 copy_func (objptr, queue);
1633 SGEN_LOG (9, "Overwrote root at %p with %p", objptr, *objptr);
1634 sgen_drain_gray_stack (-1, ctx);
1639 start_run += GC_BITS_PER_WORD;
1643 case ROOT_DESC_USER: {
1644 UserCopyOrMarkData data = { copy_func, queue };
1645 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
1646 set_user_copy_or_mark_data (&data);
1647 marker (start_root, single_arg_user_copy_or_mark);
1648 set_user_copy_or_mark_data (NULL);
1651 case ROOT_DESC_RUN_LEN:
1652 g_assert_not_reached ();
1654 g_assert_not_reached ();
1659 reset_heap_boundaries (void)
1661 lowest_heap_address = ~(mword)0;
1662 highest_heap_address = 0;
1666 sgen_update_heap_boundaries (mword low, mword high)
1671 old = lowest_heap_address;
1674 } while (SGEN_CAS_PTR ((gpointer*)&lowest_heap_address, (gpointer)low, (gpointer)old) != (gpointer)old);
1677 old = highest_heap_address;
1680 } while (SGEN_CAS_PTR ((gpointer*)&highest_heap_address, (gpointer)high, (gpointer)old) != (gpointer)old);
1684 * Allocate and setup the data structures needed to be able to allocate objects
1685 * in the nursery. The nursery is stored in nursery_section.
1688 alloc_nursery (void)
1690 GCMemSection *section;
1695 if (nursery_section)
1697 SGEN_LOG (2, "Allocating nursery size: %lu", (unsigned long)sgen_nursery_size);
1698 /* later we will alloc a larger area for the nursery but only activate
1699 * what we need. The rest will be used as expansion if we have too many pinned
1700 * objects in the existing nursery.
1702 /* FIXME: handle OOM */
1703 section = sgen_alloc_internal (INTERNAL_MEM_SECTION);
1705 alloc_size = sgen_nursery_size;
1707 /* If there isn't enough space even for the nursery we should simply abort. */
1708 g_assert (sgen_memgov_try_alloc_space (alloc_size, SPACE_NURSERY));
1710 #ifdef SGEN_ALIGN_NURSERY
1711 data = major_collector.alloc_heap (alloc_size, alloc_size, DEFAULT_NURSERY_BITS);
1713 data = major_collector.alloc_heap (alloc_size, 0, DEFAULT_NURSERY_BITS);
1715 sgen_update_heap_boundaries ((mword)data, (mword)(data + sgen_nursery_size));
1716 SGEN_LOG (4, "Expanding nursery size (%p-%p): %lu, total: %lu", data, data + alloc_size, (unsigned long)sgen_nursery_size, (unsigned long)mono_gc_get_heap_size ());
1717 section->data = section->next_data = data;
1718 section->size = alloc_size;
1719 section->end_data = data + sgen_nursery_size;
1720 scan_starts = (alloc_size + SCAN_START_SIZE - 1) / SCAN_START_SIZE;
1721 section->scan_starts = sgen_alloc_internal_dynamic (sizeof (char*) * scan_starts, INTERNAL_MEM_SCAN_STARTS, TRUE);
1722 section->num_scan_start = scan_starts;
1724 nursery_section = section;
1726 sgen_nursery_allocator_set_nursery_bounds (data, data + sgen_nursery_size);
1730 mono_gc_get_nursery (int *shift_bits, size_t *size)
1732 *size = sgen_nursery_size;
1733 #ifdef SGEN_ALIGN_NURSERY
1734 *shift_bits = DEFAULT_NURSERY_BITS;
1738 return sgen_get_nursery_start ();
1742 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1744 SgenThreadInfo *info = mono_thread_info_current ();
1746 /* Could be called from sgen_thread_unregister () with a NULL info */
1749 info->stopped_domain = domain;
1754 mono_gc_precise_stack_mark_enabled (void)
1756 return !conservative_stack_mark;
1760 mono_gc_get_logfile (void)
1762 return gc_debug_file;
1766 report_finalizer_roots_list (FinalizeReadyEntry *list)
1768 GCRootReport report;
1769 FinalizeReadyEntry *fin;
1772 for (fin = list; fin; fin = fin->next) {
1775 add_profile_gc_root (&report, fin->object, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1777 notify_gc_roots (&report);
1781 report_finalizer_roots (void)
1783 report_finalizer_roots_list (fin_ready_list);
1784 report_finalizer_roots_list (critical_fin_list);
1787 static GCRootReport *root_report;
1790 single_arg_report_root (void **obj)
1793 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1797 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1799 switch (desc & ROOT_DESC_TYPE_MASK) {
1800 case ROOT_DESC_BITMAP:
1801 desc >>= ROOT_DESC_TYPE_SHIFT;
1803 if ((desc & 1) && *start_root) {
1804 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1810 case ROOT_DESC_COMPLEX: {
1811 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1812 int bwords = (*bitmap_data) - 1;
1813 void **start_run = start_root;
1815 while (bwords-- > 0) {
1816 gsize bmap = *bitmap_data++;
1817 void **objptr = start_run;
1819 if ((bmap & 1) && *objptr) {
1820 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1825 start_run += GC_BITS_PER_WORD;
1829 case ROOT_DESC_USER: {
1830 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
1831 root_report = report;
1832 marker (start_root, single_arg_report_root);
1835 case ROOT_DESC_RUN_LEN:
1836 g_assert_not_reached ();
1838 g_assert_not_reached ();
1843 report_registered_roots_by_type (int root_type)
1845 GCRootReport report;
1849 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
1850 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1851 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1852 } SGEN_HASH_TABLE_FOREACH_END;
1853 notify_gc_roots (&report);
1857 report_registered_roots (void)
1859 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1860 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
1864 scan_finalizer_entries (FinalizeReadyEntry *list, ScanCopyContext ctx)
1866 CopyOrMarkObjectFunc copy_func = ctx.copy_func;
1867 SgenGrayQueue *queue = ctx.queue;
1868 FinalizeReadyEntry *fin;
1870 for (fin = list; fin; fin = fin->next) {
1873 SGEN_LOG (5, "Scan of fin ready object: %p (%s)\n", fin->object, safe_name (fin->object));
1874 copy_func (&fin->object, queue);
1879 generation_name (int generation)
1881 switch (generation) {
1882 case GENERATION_NURSERY: return "nursery";
1883 case GENERATION_OLD: return "old";
1884 default: g_assert_not_reached ();
1889 sgen_generation_name (int generation)
1891 return generation_name (generation);
1894 SgenObjectOperations *
1895 sgen_get_current_object_ops (void){
1896 return ¤t_object_ops;
1901 finish_gray_stack (char *start_addr, char *end_addr, int generation, GrayQueue *queue)
1905 int done_with_ephemerons, ephemeron_rounds = 0;
1906 CopyOrMarkObjectFunc copy_func = current_object_ops.copy_or_mark_object;
1907 ScanObjectFunc scan_func = current_object_ops.scan_object;
1908 ScanCopyContext ctx = { scan_func, copy_func, queue };
1911 * We copied all the reachable objects. Now it's the time to copy
1912 * the objects that were not referenced by the roots, but by the copied objects.
1913 * we built a stack of objects pointed to by gray_start: they are
1914 * additional roots and we may add more items as we go.
1915 * We loop until gray_start == gray_objects which means no more objects have
1916 * been added. Note this is iterative: no recursion is involved.
1917 * We need to walk the LO list as well in search of marked big objects
1918 * (use a flag since this is needed only on major collections). We need to loop
1919 * here as well, so keep a counter of marked LO (increasing it in copy_object).
1920 * To achieve better cache locality and cache usage, we drain the gray stack
1921 * frequently, after each object is copied, and just finish the work here.
1923 sgen_drain_gray_stack (-1, ctx);
1925 SGEN_LOG (2, "%s generation done", generation_name (generation));
1928 Reset bridge data, we might have lingering data from a previous collection if this is a major
1929 collection trigged by minor overflow.
1931 We must reset the gathered bridges since their original block might be evacuated due to major
1932 fragmentation in the meanwhile and the bridge code should not have to deal with that.
1934 sgen_bridge_reset_data ();
1937 * Walk the ephemeron tables marking all values with reachable keys. This must be completely done
1938 * before processing finalizable objects and non-tracking weak links to avoid finalizing/clearing
1939 * objects that are in fact reachable.
1941 done_with_ephemerons = 0;
1943 done_with_ephemerons = mark_ephemerons_in_range (ctx);
1944 sgen_drain_gray_stack (-1, ctx);
1946 } while (!done_with_ephemerons);
1948 sgen_scan_togglerefs (start_addr, end_addr, ctx);
1949 if (generation == GENERATION_OLD)
1950 sgen_scan_togglerefs (sgen_get_nursery_start (), sgen_get_nursery_end (), ctx);
1952 if (sgen_need_bridge_processing ()) {
1953 sgen_collect_bridge_objects (generation, ctx);
1954 if (generation == GENERATION_OLD)
1955 sgen_collect_bridge_objects (GENERATION_NURSERY, ctx);
1959 Make sure we drain the gray stack before processing disappearing links and finalizers.
1960 If we don't make sure it is empty we might wrongly see a live object as dead.
1962 sgen_drain_gray_stack (-1, ctx);
1965 We must clear weak links that don't track resurrection before processing object ready for
1966 finalization so they can be cleared before that.
1968 sgen_null_link_in_range (generation, TRUE, ctx);
1969 if (generation == GENERATION_OLD)
1970 sgen_null_link_in_range (GENERATION_NURSERY, TRUE, ctx);
1973 /* walk the finalization queue and move also the objects that need to be
1974 * finalized: use the finalized objects as new roots so the objects they depend
1975 * on are also not reclaimed. As with the roots above, only objects in the nursery
1976 * are marked/copied.
1978 sgen_finalize_in_range (generation, ctx);
1979 if (generation == GENERATION_OLD)
1980 sgen_finalize_in_range (GENERATION_NURSERY, ctx);
1981 /* drain the new stack that might have been created */
1982 SGEN_LOG (6, "Precise scan of gray area post fin");
1983 sgen_drain_gray_stack (-1, ctx);
1986 * This must be done again after processing finalizable objects since CWL slots are cleared only after the key is finalized.
1988 done_with_ephemerons = 0;
1990 done_with_ephemerons = mark_ephemerons_in_range (ctx);
1991 sgen_drain_gray_stack (-1, ctx);
1993 } while (!done_with_ephemerons);
1996 * Clear ephemeron pairs with unreachable keys.
1997 * We pass the copy func so we can figure out if an array was promoted or not.
1999 clear_unreachable_ephemerons (generation == GENERATION_OLD && major_collector.is_concurrent, ctx);
2002 SGEN_LOG (2, "Finalize queue handling scan for %s generation: %d usecs %d ephemeron rounds", generation_name (generation), TV_ELAPSED (atv, btv), ephemeron_rounds);
2005 * handle disappearing links
2006 * Note we do this after checking the finalization queue because if an object
2007 * survives (at least long enough to be finalized) we don't clear the link.
2008 * This also deals with a possible issue with the monitor reclamation: with the Boehm
2009 * GC a finalized object my lose the monitor because it is cleared before the finalizer is
2012 g_assert (sgen_gray_object_queue_is_empty (queue));
2014 sgen_null_link_in_range (generation, FALSE, ctx);
2015 if (generation == GENERATION_OLD)
2016 sgen_null_link_in_range (GENERATION_NURSERY, FALSE, ctx);
2017 if (sgen_gray_object_queue_is_empty (queue))
2019 sgen_drain_gray_stack (-1, ctx);
2022 g_assert (sgen_gray_object_queue_is_empty (queue));
2026 sgen_check_section_scan_starts (GCMemSection *section)
2029 for (i = 0; i < section->num_scan_start; ++i) {
2030 if (section->scan_starts [i]) {
2031 guint size = safe_object_get_size ((MonoObject*) section->scan_starts [i]);
2032 g_assert (size >= sizeof (MonoObject) && size <= MAX_SMALL_OBJ_SIZE);
2038 check_scan_starts (void)
2040 if (!do_scan_starts_check)
2042 sgen_check_section_scan_starts (nursery_section);
2043 major_collector.check_scan_starts ();
2047 scan_from_registered_roots (char *addr_start, char *addr_end, int root_type, ScanCopyContext ctx)
2051 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
2052 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
2053 precisely_scan_objects_from (start_root, (void**)root->end_root, addr_start, addr_end, root->root_desc, ctx);
2054 } SGEN_HASH_TABLE_FOREACH_END;
2058 sgen_dump_occupied (char *start, char *end, char *section_start)
2060 fprintf (heap_dump_file, "<occupied offset=\"%td\" size=\"%td\"/>\n", start - section_start, end - start);
2064 sgen_dump_section (GCMemSection *section, const char *type)
2066 char *start = section->data;
2067 char *end = section->data + section->size;
2068 char *occ_start = NULL;
2070 char *old_start = NULL; /* just for debugging */
2072 fprintf (heap_dump_file, "<section type=\"%s\" size=\"%lu\">\n", type, (unsigned long)section->size);
2074 while (start < end) {
2078 if (!*(void**)start) {
2080 sgen_dump_occupied (occ_start, start, section->data);
2083 start += sizeof (void*); /* should be ALLOC_ALIGN, really */
2086 g_assert (start < section->next_data);
2091 vt = (GCVTable*)LOAD_VTABLE (start);
2094 size = ALIGN_UP (safe_object_get_size ((MonoObject*) start));
2097 fprintf (heap_dump_file, "<object offset=\"%d\" class=\"%s.%s\" size=\"%d\"/>\n",
2098 start - section->data,
2099 vt->klass->name_space, vt->klass->name,
2107 sgen_dump_occupied (occ_start, start, section->data);
2109 fprintf (heap_dump_file, "</section>\n");
2113 dump_object (MonoObject *obj, gboolean dump_location)
2115 static char class_name [1024];
2117 MonoClass *class = mono_object_class (obj);
2121 * Python's XML parser is too stupid to parse angle brackets
2122 * in strings, so we just ignore them;
2125 while (class->name [i] && j < sizeof (class_name) - 1) {
2126 if (!strchr ("<>\"", class->name [i]))
2127 class_name [j++] = class->name [i];
2130 g_assert (j < sizeof (class_name));
2133 fprintf (heap_dump_file, "<object class=\"%s.%s\" size=\"%d\"",
2134 class->name_space, class_name,
2135 safe_object_get_size (obj));
2136 if (dump_location) {
2137 const char *location;
2138 if (ptr_in_nursery (obj))
2139 location = "nursery";
2140 else if (safe_object_get_size (obj) <= MAX_SMALL_OBJ_SIZE)
2144 fprintf (heap_dump_file, " location=\"%s\"", location);
2146 fprintf (heap_dump_file, "/>\n");
2150 dump_heap (const char *type, int num, const char *reason)
2155 fprintf (heap_dump_file, "<collection type=\"%s\" num=\"%d\"", type, num);
2157 fprintf (heap_dump_file, " reason=\"%s\"", reason);
2158 fprintf (heap_dump_file, ">\n");
2159 fprintf (heap_dump_file, "<other-mem-usage type=\"mempools\" size=\"%ld\"/>\n", mono_mempool_get_bytes_allocated ());
2160 sgen_dump_internal_mem_usage (heap_dump_file);
2161 fprintf (heap_dump_file, "<pinned type=\"stack\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_STACK));
2162 /* fprintf (heap_dump_file, "<pinned type=\"static-data\" bytes=\"%d\"/>\n", pinned_byte_counts [PIN_TYPE_STATIC_DATA]); */
2163 fprintf (heap_dump_file, "<pinned type=\"other\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_OTHER));
2165 fprintf (heap_dump_file, "<pinned-objects>\n");
2166 for (list = sgen_pin_stats_get_object_list (); list; list = list->next)
2167 dump_object (list->obj, TRUE);
2168 fprintf (heap_dump_file, "</pinned-objects>\n");
2170 sgen_dump_section (nursery_section, "nursery");
2172 major_collector.dump_heap (heap_dump_file);
2174 fprintf (heap_dump_file, "<los>\n");
2175 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
2176 dump_object ((MonoObject*)bigobj->data, FALSE);
2177 fprintf (heap_dump_file, "</los>\n");
2179 fprintf (heap_dump_file, "</collection>\n");
2183 sgen_register_moved_object (void *obj, void *destination)
2185 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2187 /* FIXME: handle this for parallel collector */
2188 g_assert (!sgen_collection_is_parallel ());
2190 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2191 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2192 moved_objects_idx = 0;
2194 moved_objects [moved_objects_idx++] = obj;
2195 moved_objects [moved_objects_idx++] = destination;
2201 static gboolean inited = FALSE;
2206 mono_counters_register ("Minor fragment clear", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_pre_collection_fragment_clear);
2207 mono_counters_register ("Minor pinning", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_pinning);
2208 mono_counters_register ("Minor scan remembered set", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_remsets);
2209 mono_counters_register ("Minor scan pinned", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_pinned);
2210 mono_counters_register ("Minor scan registered roots", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_registered_roots);
2211 mono_counters_register ("Minor scan thread data", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_thread_data);
2212 mono_counters_register ("Minor finish gray stack", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_finish_gray_stack);
2213 mono_counters_register ("Minor fragment creation", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_fragment_creation);
2215 mono_counters_register ("Major fragment clear", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_pre_collection_fragment_clear);
2216 mono_counters_register ("Major pinning", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_pinning);
2217 mono_counters_register ("Major scan pinned", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_pinned);
2218 mono_counters_register ("Major scan registered roots", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_registered_roots);
2219 mono_counters_register ("Major scan thread data", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_thread_data);
2220 mono_counters_register ("Major scan alloc_pinned", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_alloc_pinned);
2221 mono_counters_register ("Major scan finalized", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_finalized);
2222 mono_counters_register ("Major scan big objects", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_big_objects);
2223 mono_counters_register ("Major finish gray stack", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_finish_gray_stack);
2224 mono_counters_register ("Major free big objects", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_free_bigobjs);
2225 mono_counters_register ("Major LOS sweep", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_los_sweep);
2226 mono_counters_register ("Major sweep", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_sweep);
2227 mono_counters_register ("Major fragment creation", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_fragment_creation);
2229 mono_counters_register ("Number of pinned objects", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_pinned_objects);
2231 #ifdef HEAVY_STATISTICS
2232 mono_counters_register ("WBarrier set field", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_set_field);
2233 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_set_arrayref);
2234 mono_counters_register ("WBarrier arrayref copy", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_arrayref_copy);
2235 mono_counters_register ("WBarrier generic store called", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_generic_store);
2236 mono_counters_register ("WBarrier set root", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_set_root);
2237 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_value_copy);
2238 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_object_copy);
2240 mono_counters_register ("# objects allocated degraded", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_objects_alloced_degraded);
2241 mono_counters_register ("bytes allocated degraded", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_bytes_alloced_degraded);
2243 mono_counters_register ("# copy_object() called (nursery)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_copy_object_called_nursery);
2244 mono_counters_register ("# objects copied (nursery)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_objects_copied_nursery);
2245 mono_counters_register ("# copy_object() called (major)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_copy_object_called_major);
2246 mono_counters_register ("# objects copied (major)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_objects_copied_major);
2248 mono_counters_register ("# scan_object() called (nursery)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_scan_object_called_nursery);
2249 mono_counters_register ("# scan_object() called (major)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_scan_object_called_major);
2251 mono_counters_register ("Slots allocated in vain", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_slots_allocated_in_vain);
2253 mono_counters_register ("# nursery copy_object() failed from space", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_from_space);
2254 mono_counters_register ("# nursery copy_object() failed forwarded", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_forwarded);
2255 mono_counters_register ("# nursery copy_object() failed pinned", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_pinned);
2256 mono_counters_register ("# nursery copy_object() failed to space", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_to_space);
2258 sgen_nursery_allocator_init_heavy_stats ();
2259 sgen_alloc_init_heavy_stats ();
2267 reset_pinned_from_failed_allocation (void)
2269 bytes_pinned_from_failed_allocation = 0;
2273 sgen_set_pinned_from_failed_allocation (mword objsize)
2275 bytes_pinned_from_failed_allocation += objsize;
2279 sgen_collection_is_parallel (void)
2281 switch (current_collection_generation) {
2282 case GENERATION_NURSERY:
2283 return nursery_collection_is_parallel;
2284 case GENERATION_OLD:
2285 return major_collector.is_parallel;
2287 g_error ("Invalid current generation %d", current_collection_generation);
2292 sgen_collection_is_concurrent (void)
2294 switch (current_collection_generation) {
2295 case GENERATION_NURSERY:
2297 case GENERATION_OLD:
2298 return major_collector.is_concurrent;
2300 g_error ("Invalid current generation %d", current_collection_generation);
2305 sgen_concurrent_collection_in_progress (void)
2307 return concurrent_collection_in_progress;
2314 } FinishRememberedSetScanJobData;
2317 job_finish_remembered_set_scan (WorkerData *worker_data, void *job_data_untyped)
2319 FinishRememberedSetScanJobData *job_data = job_data_untyped;
2321 remset.finish_scan_remsets (job_data->heap_start, job_data->heap_end, sgen_workers_get_job_gray_queue (worker_data));
2322 sgen_free_internal_dynamic (job_data, sizeof (FinishRememberedSetScanJobData), INTERNAL_MEM_WORKER_JOB_DATA);
2327 CopyOrMarkObjectFunc copy_or_mark_func;
2328 ScanObjectFunc scan_func;
2332 } ScanFromRegisteredRootsJobData;
2335 job_scan_from_registered_roots (WorkerData *worker_data, void *job_data_untyped)
2337 ScanFromRegisteredRootsJobData *job_data = job_data_untyped;
2338 ScanCopyContext ctx = { job_data->scan_func, job_data->copy_or_mark_func,
2339 sgen_workers_get_job_gray_queue (worker_data) };
2341 scan_from_registered_roots (job_data->heap_start, job_data->heap_end, job_data->root_type, ctx);
2342 sgen_free_internal_dynamic (job_data, sizeof (ScanFromRegisteredRootsJobData), INTERNAL_MEM_WORKER_JOB_DATA);
2349 } ScanThreadDataJobData;
2352 job_scan_thread_data (WorkerData *worker_data, void *job_data_untyped)
2354 ScanThreadDataJobData *job_data = job_data_untyped;
2356 scan_thread_data (job_data->heap_start, job_data->heap_end, TRUE,
2357 sgen_workers_get_job_gray_queue (worker_data));
2358 sgen_free_internal_dynamic (job_data, sizeof (ScanThreadDataJobData), INTERNAL_MEM_WORKER_JOB_DATA);
2363 FinalizeReadyEntry *list;
2364 } ScanFinalizerEntriesJobData;
2367 job_scan_finalizer_entries (WorkerData *worker_data, void *job_data_untyped)
2369 ScanFinalizerEntriesJobData *job_data = job_data_untyped;
2370 ScanCopyContext ctx = { NULL, current_object_ops.copy_or_mark_object, sgen_workers_get_job_gray_queue (worker_data) };
2372 scan_finalizer_entries (job_data->list, ctx);
2373 sgen_free_internal_dynamic (job_data, sizeof (ScanFinalizerEntriesJobData), INTERNAL_MEM_WORKER_JOB_DATA);
2377 job_scan_major_mod_union_cardtable (WorkerData *worker_data, void *job_data_untyped)
2379 g_assert (concurrent_collection_in_progress);
2380 major_collector.scan_card_table (TRUE, sgen_workers_get_job_gray_queue (worker_data));
2384 job_scan_los_mod_union_cardtable (WorkerData *worker_data, void *job_data_untyped)
2386 g_assert (concurrent_collection_in_progress);
2387 sgen_los_scan_card_table (TRUE, sgen_workers_get_job_gray_queue (worker_data));
2391 verify_scan_starts (char *start, char *end)
2395 for (i = 0; i < nursery_section->num_scan_start; ++i) {
2396 char *addr = nursery_section->scan_starts [i];
2397 if (addr > start && addr < end)
2398 SGEN_LOG (1, "NFC-BAD SCAN START [%d] %p for obj [%p %p]", i, addr, start, end);
2403 verify_nursery (void)
2405 char *start, *end, *cur, *hole_start;
2407 if (!do_verify_nursery)
2410 /*This cleans up unused fragments */
2411 sgen_nursery_allocator_prepare_for_pinning ();
2413 hole_start = start = cur = sgen_get_nursery_start ();
2414 end = sgen_get_nursery_end ();
2419 if (!*(void**)cur) {
2420 cur += sizeof (void*);
2424 if (object_is_forwarded (cur))
2425 SGEN_LOG (1, "FORWARDED OBJ %p", cur);
2426 else if (object_is_pinned (cur))
2427 SGEN_LOG (1, "PINNED OBJ %p", cur);
2429 ss = safe_object_get_size ((MonoObject*)cur);
2430 size = ALIGN_UP (safe_object_get_size ((MonoObject*)cur));
2431 verify_scan_starts (cur, cur + size);
2432 if (do_dump_nursery_content) {
2433 if (cur > hole_start)
2434 SGEN_LOG (1, "HOLE [%p %p %d]", hole_start, cur, (int)(cur - hole_start));
2435 SGEN_LOG (1, "OBJ [%p %p %d %d %s %d]", cur, cur + size, (int)size, (int)ss, sgen_safe_name ((MonoObject*)cur), (gpointer)LOAD_VTABLE (cur) == sgen_get_array_fill_vtable ());
2443 * Checks that no objects in the nursery are fowarded or pinned. This
2444 * is a precondition to restarting the mutator while doing a
2445 * concurrent collection. Note that we don't clear fragments because
2446 * we depend on that having happened earlier.
2449 check_nursery_is_clean (void)
2451 char *start, *end, *cur;
2453 start = cur = sgen_get_nursery_start ();
2454 end = sgen_get_nursery_end ();
2459 if (!*(void**)cur) {
2460 cur += sizeof (void*);
2464 g_assert (!object_is_forwarded (cur));
2465 g_assert (!object_is_pinned (cur));
2467 ss = safe_object_get_size ((MonoObject*)cur);
2468 size = ALIGN_UP (safe_object_get_size ((MonoObject*)cur));
2469 verify_scan_starts (cur, cur + size);
2476 init_gray_queue (void)
2478 if (sgen_collection_is_parallel () || sgen_collection_is_concurrent ()) {
2479 sgen_workers_init_distribute_gray_queue ();
2480 sgen_gray_object_queue_init_with_alloc_prepare (&gray_queue, NULL,
2481 gray_queue_redirect, sgen_workers_get_distribute_section_gray_queue ());
2483 sgen_gray_object_queue_init (&gray_queue, NULL);
2486 if (major_collector.is_concurrent) {
2487 sgen_gray_object_queue_init_with_alloc_prepare (&remember_major_objects_gray_queue, NULL,
2488 gray_queue_redirect, sgen_workers_get_distribute_section_gray_queue ());
2490 sgen_gray_object_queue_init_invalid (&remember_major_objects_gray_queue);
2495 pin_stage_object_callback (char *obj, size_t size, void *data)
2497 sgen_pin_stage_ptr (obj);
2498 /* FIXME: do pin stats if enabled */
2502 * Collect objects in the nursery. Returns whether to trigger a major
2506 collect_nursery (SgenGrayQueue *unpin_queue, gboolean finish_up_concurrent_mark)
2508 gboolean needs_major;
2509 size_t max_garbage_amount;
2511 FinishRememberedSetScanJobData *frssjd;
2512 ScanFromRegisteredRootsJobData *scrrjd_normal, *scrrjd_wbarrier;
2513 ScanFinalizerEntriesJobData *sfejd_fin_ready, *sfejd_critical_fin;
2514 ScanThreadDataJobData *stdjd;
2515 mword fragment_total;
2516 ScanCopyContext ctx;
2517 TV_DECLARE (all_atv);
2518 TV_DECLARE (all_btv);
2522 if (disable_minor_collections)
2525 MONO_GC_BEGIN (GENERATION_NURSERY);
2526 binary_protocol_collection_begin (stat_minor_gcs, GENERATION_NURSERY);
2530 #ifndef DISABLE_PERFCOUNTERS
2531 mono_perfcounters->gc_collections0++;
2534 current_collection_generation = GENERATION_NURSERY;
2535 if (sgen_collection_is_parallel ())
2536 current_object_ops = sgen_minor_collector.parallel_ops;
2538 current_object_ops = sgen_minor_collector.serial_ops;
2540 reset_pinned_from_failed_allocation ();
2542 check_scan_starts ();
2544 sgen_nursery_alloc_prepare_for_minor ();
2548 nursery_next = sgen_nursery_alloc_get_upper_alloc_bound ();
2549 /* FIXME: optimize later to use the higher address where an object can be present */
2550 nursery_next = MAX (nursery_next, sgen_get_nursery_end ());
2552 SGEN_LOG (1, "Start nursery collection %d %p-%p, size: %d", stat_minor_gcs, sgen_get_nursery_start (), nursery_next, (int)(nursery_next - sgen_get_nursery_start ()));
2553 max_garbage_amount = nursery_next - sgen_get_nursery_start ();
2554 g_assert (nursery_section->size >= max_garbage_amount);
2556 /* world must be stopped already */
2557 TV_GETTIME (all_atv);
2561 time_minor_pre_collection_fragment_clear += TV_ELAPSED (atv, btv);
2563 if (xdomain_checks) {
2564 sgen_clear_nursery_fragments ();
2565 check_for_xdomain_refs ();
2568 nursery_section->next_data = nursery_next;
2570 major_collector.start_nursery_collection ();
2572 sgen_memgov_minor_collection_start ();
2577 gc_stats.minor_gc_count ++;
2579 if (remset.prepare_for_minor_collection)
2580 remset.prepare_for_minor_collection ();
2582 MONO_GC_CHECKPOINT_1 (GENERATION_NURSERY);
2584 sgen_process_fin_stage_entries ();
2585 sgen_process_dislink_stage_entries ();
2587 MONO_GC_CHECKPOINT_2 (GENERATION_NURSERY);
2589 /* pin from pinned handles */
2590 sgen_init_pinning ();
2591 mono_profiler_gc_event (MONO_GC_EVENT_MARK_START, 0);
2592 pin_from_roots (sgen_get_nursery_start (), nursery_next, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2593 /* pin cemented objects */
2594 sgen_cement_iterate (pin_stage_object_callback, NULL);
2595 /* identify pinned objects */
2596 sgen_optimize_pin_queue (0);
2597 sgen_pinning_setup_section (nursery_section);
2598 ctx.scan_func = NULL;
2599 ctx.copy_func = NULL;
2600 ctx.queue = WORKERS_DISTRIBUTE_GRAY_QUEUE;
2601 sgen_pin_objects_in_section (nursery_section, ctx);
2602 sgen_pinning_trim_queue_to_section (nursery_section);
2605 time_minor_pinning += TV_ELAPSED (btv, atv);
2606 SGEN_LOG (2, "Finding pinned pointers: %d in %d usecs", sgen_get_pinned_count (), TV_ELAPSED (btv, atv));
2607 SGEN_LOG (4, "Start scan with %d pinned objects", sgen_get_pinned_count ());
2609 MONO_GC_CHECKPOINT_3 (GENERATION_NURSERY);
2611 if (whole_heap_check_before_collection) {
2612 sgen_clear_nursery_fragments ();
2613 sgen_check_whole_heap (finish_up_concurrent_mark);
2615 if (consistency_check_at_minor_collection)
2616 sgen_check_consistency ();
2618 sgen_workers_start_all_workers ();
2621 * Perform the sequential part of remembered set scanning.
2622 * This usually involves scanning global information that might later be produced by evacuation.
2624 if (remset.begin_scan_remsets)
2625 remset.begin_scan_remsets (sgen_get_nursery_start (), nursery_next, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2627 sgen_workers_start_marking ();
2629 frssjd = sgen_alloc_internal_dynamic (sizeof (FinishRememberedSetScanJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
2630 frssjd->heap_start = sgen_get_nursery_start ();
2631 frssjd->heap_end = nursery_next;
2632 sgen_workers_enqueue_job (job_finish_remembered_set_scan, frssjd);
2634 /* we don't have complete write barrier yet, so we scan all the old generation sections */
2636 time_minor_scan_remsets += TV_ELAPSED (atv, btv);
2637 SGEN_LOG (2, "Old generation scan: %d usecs", TV_ELAPSED (atv, btv));
2639 MONO_GC_CHECKPOINT_4 (GENERATION_NURSERY);
2641 if (!sgen_collection_is_parallel ()) {
2642 ctx.scan_func = current_object_ops.scan_object;
2643 ctx.copy_func = NULL;
2644 ctx.queue = &gray_queue;
2645 sgen_drain_gray_stack (-1, ctx);
2648 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2649 report_registered_roots ();
2650 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2651 report_finalizer_roots ();
2653 time_minor_scan_pinned += TV_ELAPSED (btv, atv);
2655 MONO_GC_CHECKPOINT_5 (GENERATION_NURSERY);
2657 /* registered roots, this includes static fields */
2658 scrrjd_normal = sgen_alloc_internal_dynamic (sizeof (ScanFromRegisteredRootsJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
2659 scrrjd_normal->copy_or_mark_func = current_object_ops.copy_or_mark_object;
2660 scrrjd_normal->scan_func = current_object_ops.scan_object;
2661 scrrjd_normal->heap_start = sgen_get_nursery_start ();
2662 scrrjd_normal->heap_end = nursery_next;
2663 scrrjd_normal->root_type = ROOT_TYPE_NORMAL;
2664 sgen_workers_enqueue_job (job_scan_from_registered_roots, scrrjd_normal);
2666 scrrjd_wbarrier = sgen_alloc_internal_dynamic (sizeof (ScanFromRegisteredRootsJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
2667 scrrjd_wbarrier->copy_or_mark_func = current_object_ops.copy_or_mark_object;
2668 scrrjd_wbarrier->scan_func = current_object_ops.scan_object;
2669 scrrjd_wbarrier->heap_start = sgen_get_nursery_start ();
2670 scrrjd_wbarrier->heap_end = nursery_next;
2671 scrrjd_wbarrier->root_type = ROOT_TYPE_WBARRIER;
2672 sgen_workers_enqueue_job (job_scan_from_registered_roots, scrrjd_wbarrier);
2675 time_minor_scan_registered_roots += TV_ELAPSED (atv, btv);
2677 MONO_GC_CHECKPOINT_6 (GENERATION_NURSERY);
2680 stdjd = sgen_alloc_internal_dynamic (sizeof (ScanThreadDataJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
2681 stdjd->heap_start = sgen_get_nursery_start ();
2682 stdjd->heap_end = nursery_next;
2683 sgen_workers_enqueue_job (job_scan_thread_data, stdjd);
2686 time_minor_scan_thread_data += TV_ELAPSED (btv, atv);
2689 MONO_GC_CHECKPOINT_7 (GENERATION_NURSERY);
2691 g_assert (!sgen_collection_is_parallel () && !sgen_collection_is_concurrent ());
2693 if (sgen_collection_is_parallel () || sgen_collection_is_concurrent ())
2694 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
2696 /* Scan the list of objects ready for finalization. If */
2697 sfejd_fin_ready = sgen_alloc_internal_dynamic (sizeof (ScanFinalizerEntriesJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
2698 sfejd_fin_ready->list = fin_ready_list;
2699 sgen_workers_enqueue_job (job_scan_finalizer_entries, sfejd_fin_ready);
2701 sfejd_critical_fin = sgen_alloc_internal_dynamic (sizeof (ScanFinalizerEntriesJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
2702 sfejd_critical_fin->list = critical_fin_list;
2703 sgen_workers_enqueue_job (job_scan_finalizer_entries, sfejd_critical_fin);
2705 MONO_GC_CHECKPOINT_8 (GENERATION_NURSERY);
2707 finish_gray_stack (sgen_get_nursery_start (), nursery_next, GENERATION_NURSERY, &gray_queue);
2709 time_minor_finish_gray_stack += TV_ELAPSED (btv, atv);
2710 mono_profiler_gc_event (MONO_GC_EVENT_MARK_END, 0);
2712 MONO_GC_CHECKPOINT_9 (GENERATION_NURSERY);
2715 * The (single-threaded) finalization code might have done
2716 * some copying/marking so we can only reset the GC thread's
2717 * worker data here instead of earlier when we joined the
2720 sgen_workers_reset_data ();
2722 if (objects_pinned) {
2723 sgen_optimize_pin_queue (0);
2724 sgen_pinning_setup_section (nursery_section);
2727 /* walk the pin_queue, build up the fragment list of free memory, unmark
2728 * pinned objects as we go, memzero() the empty fragments so they are ready for the
2731 mono_profiler_gc_event (MONO_GC_EVENT_RECLAIM_START, 0);
2732 fragment_total = sgen_build_nursery_fragments (nursery_section,
2733 nursery_section->pin_queue_start, nursery_section->pin_queue_num_entries,
2735 if (!fragment_total)
2738 /* Clear TLABs for all threads */
2739 sgen_clear_tlabs ();
2741 mono_profiler_gc_event (MONO_GC_EVENT_RECLAIM_END, 0);
2743 time_minor_fragment_creation += TV_ELAPSED (atv, btv);
2744 SGEN_LOG (2, "Fragment creation: %d usecs, %lu bytes available", TV_ELAPSED (atv, btv), (unsigned long)fragment_total);
2746 if (consistency_check_at_minor_collection)
2747 sgen_check_major_refs ();
2749 major_collector.finish_nursery_collection ();
2751 TV_GETTIME (all_btv);
2752 gc_stats.minor_gc_time_usecs += TV_ELAPSED (all_atv, all_btv);
2755 dump_heap ("minor", stat_minor_gcs - 1, NULL);
2757 /* prepare the pin queue for the next collection */
2758 sgen_finish_pinning ();
2759 if (fin_ready_list || critical_fin_list) {
2760 SGEN_LOG (4, "Finalizer-thread wakeup: ready %d", num_ready_finalizers);
2761 mono_gc_finalize_notify ();
2763 sgen_pin_stats_reset ();
2764 /* clear cemented hash */
2765 sgen_cement_clear_below_threshold ();
2767 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
2769 if (remset.finish_minor_collection)
2770 remset.finish_minor_collection ();
2772 check_scan_starts ();
2774 binary_protocol_flush_buffers (FALSE);
2776 sgen_memgov_minor_collection_end ();
2778 /*objects are late pinned because of lack of memory, so a major is a good call*/
2779 needs_major = objects_pinned > 0;
2780 current_collection_generation = -1;
2783 MONO_GC_END (GENERATION_NURSERY);
2784 binary_protocol_collection_end (stat_minor_gcs - 1, GENERATION_NURSERY);
2786 if (check_nursery_objects_pinned && !sgen_minor_collector.is_split)
2787 sgen_check_nursery_objects_pinned (unpin_queue != NULL);
2793 scan_nursery_objects_callback (char *obj, size_t size, ScanCopyContext *ctx)
2795 ctx->scan_func (obj, ctx->queue);
2799 scan_nursery_objects (ScanCopyContext ctx)
2801 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
2802 (IterateObjectCallbackFunc)scan_nursery_objects_callback, (void*)&ctx, FALSE);
2806 major_copy_or_mark_from_roots (int *old_next_pin_slot, gboolean finish_up_concurrent_mark, gboolean scan_mod_union)
2811 /* FIXME: only use these values for the precise scan
2812 * note that to_space pointers should be excluded anyway...
2814 char *heap_start = NULL;
2815 char *heap_end = (char*)-1;
2816 gboolean profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2817 GCRootReport root_report = { 0 };
2818 ScanFromRegisteredRootsJobData *scrrjd_normal, *scrrjd_wbarrier;
2819 ScanThreadDataJobData *stdjd;
2820 ScanFinalizerEntriesJobData *sfejd_fin_ready, *sfejd_critical_fin;
2821 ScanCopyContext ctx;
2823 if (major_collector.is_concurrent) {
2824 /*This cleans up unused fragments */
2825 sgen_nursery_allocator_prepare_for_pinning ();
2827 if (do_concurrent_checks)
2828 check_nursery_is_clean ();
2830 /* The concurrent collector doesn't touch the nursery. */
2831 sgen_nursery_alloc_prepare_for_major ();
2838 /* Pinning depends on this */
2839 sgen_clear_nursery_fragments ();
2841 if (whole_heap_check_before_collection)
2842 sgen_check_whole_heap (finish_up_concurrent_mark);
2844 if (!major_collector.is_concurrent)
2845 sgen_cement_reset ();
2848 time_major_pre_collection_fragment_clear += TV_ELAPSED (atv, btv);
2850 if (!sgen_collection_is_concurrent ())
2851 nursery_section->next_data = sgen_get_nursery_end ();
2852 /* we should also coalesce scanning from sections close to each other
2853 * and deal with pointers outside of the sections later.
2857 *major_collector.have_swept = FALSE;
2859 if (xdomain_checks) {
2860 sgen_clear_nursery_fragments ();
2861 check_for_xdomain_refs ();
2864 if (!major_collector.is_concurrent) {
2865 /* Remsets are not useful for a major collection */
2866 remset.prepare_for_major_collection ();
2869 sgen_process_fin_stage_entries ();
2870 sgen_process_dislink_stage_entries ();
2873 sgen_init_pinning ();
2874 SGEN_LOG (6, "Collecting pinned addresses");
2875 pin_from_roots ((void*)lowest_heap_address, (void*)highest_heap_address, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2876 sgen_optimize_pin_queue (0);
2879 * The concurrent collector doesn't move objects, neither on
2880 * the major heap nor in the nursery, so we can mark even
2881 * before pinning has finished. For the non-concurrent
2882 * collector we start the workers after pinning.
2884 if (major_collector.is_concurrent) {
2885 sgen_workers_start_all_workers ();
2886 sgen_workers_start_marking ();
2890 * pin_queue now contains all candidate pointers, sorted and
2891 * uniqued. We must do two passes now to figure out which
2892 * objects are pinned.
2894 * The first is to find within the pin_queue the area for each
2895 * section. This requires that the pin_queue be sorted. We
2896 * also process the LOS objects and pinned chunks here.
2898 * The second, destructive, pass is to reduce the section
2899 * areas to pointers to the actually pinned objects.
2901 SGEN_LOG (6, "Pinning from sections");
2902 /* first pass for the sections */
2903 sgen_find_section_pin_queue_start_end (nursery_section);
2904 major_collector.find_pin_queue_start_ends (WORKERS_DISTRIBUTE_GRAY_QUEUE);
2905 /* identify possible pointers to the insize of large objects */
2906 SGEN_LOG (6, "Pinning from large objects");
2907 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next) {
2909 if (sgen_find_optimized_pin_queue_area (bigobj->data, (char*)bigobj->data + sgen_los_object_size (bigobj), &dummy)) {
2910 binary_protocol_pin (bigobj->data, (gpointer)LOAD_VTABLE (bigobj->data), safe_object_get_size (((MonoObject*)(bigobj->data))));
2912 #ifdef ENABLE_DTRACE
2913 if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
2914 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (bigobj->data);
2915 MONO_GC_OBJ_PINNED ((mword)bigobj->data, sgen_safe_object_get_size ((MonoObject*)bigobj->data), vt->klass->name_space, vt->klass->name, GENERATION_OLD);
2919 if (sgen_los_object_is_pinned (bigobj->data)) {
2920 g_assert (finish_up_concurrent_mark);
2923 sgen_los_pin_object (bigobj->data);
2924 /* FIXME: only enqueue if object has references */
2925 GRAY_OBJECT_ENQUEUE (WORKERS_DISTRIBUTE_GRAY_QUEUE, bigobj->data);
2926 if (G_UNLIKELY (do_pin_stats))
2927 sgen_pin_stats_register_object ((char*) bigobj->data, safe_object_get_size ((MonoObject*) bigobj->data));
2928 SGEN_LOG (6, "Marked large object %p (%s) size: %lu from roots", bigobj->data, safe_name (bigobj->data), (unsigned long)sgen_los_object_size (bigobj));
2931 add_profile_gc_root (&root_report, bigobj->data, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2935 notify_gc_roots (&root_report);
2936 /* second pass for the sections */
2937 ctx.scan_func = concurrent_collection_in_progress ? current_object_ops.scan_object : NULL;
2938 ctx.copy_func = NULL;
2939 ctx.queue = WORKERS_DISTRIBUTE_GRAY_QUEUE;
2942 * Concurrent mark never follows references into the nursery.
2943 * In the start and finish pauses we must scan live nursery
2944 * objects, though. We could simply scan all nursery objects,
2945 * but that would be conservative. The easiest way is to do a
2946 * nursery collection, which copies all live nursery objects
2947 * (except pinned ones, with the simple nursery) to the major
2948 * heap. Scanning the mod union table later will then scan
2949 * those promoted objects, provided they're reachable. Pinned
2950 * objects in the nursery - which we can trivially find in the
2951 * pinning queue - are treated as roots in the mark pauses.
2953 * The split nursery complicates the latter part because
2954 * non-pinned objects can survive in the nursery. That's why
2955 * we need to do a full front-to-back scan of the nursery,
2956 * marking all objects.
2958 * Non-concurrent mark evacuates from the nursery, so it's
2959 * sufficient to just scan pinned nursery objects.
2961 if (major_collector.is_concurrent && sgen_minor_collector.is_split) {
2962 scan_nursery_objects (ctx);
2964 sgen_pin_objects_in_section (nursery_section, ctx);
2965 if (check_nursery_objects_pinned && !sgen_minor_collector.is_split)
2966 sgen_check_nursery_objects_pinned (!concurrent_collection_in_progress || finish_up_concurrent_mark);
2969 major_collector.pin_objects (WORKERS_DISTRIBUTE_GRAY_QUEUE);
2970 if (old_next_pin_slot)
2971 *old_next_pin_slot = sgen_get_pinned_count ();
2974 time_major_pinning += TV_ELAPSED (atv, btv);
2975 SGEN_LOG (2, "Finding pinned pointers: %d in %d usecs", sgen_get_pinned_count (), TV_ELAPSED (atv, btv));
2976 SGEN_LOG (4, "Start scan with %d pinned objects", sgen_get_pinned_count ());
2978 major_collector.init_to_space ();
2980 #ifdef SGEN_DEBUG_INTERNAL_ALLOC
2981 main_gc_thread = mono_native_thread_self ();
2984 if (!major_collector.is_concurrent) {
2985 sgen_workers_start_all_workers ();
2986 sgen_workers_start_marking ();
2989 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2990 report_registered_roots ();
2992 time_major_scan_pinned += TV_ELAPSED (btv, atv);
2994 /* registered roots, this includes static fields */
2995 scrrjd_normal = sgen_alloc_internal_dynamic (sizeof (ScanFromRegisteredRootsJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
2996 scrrjd_normal->copy_or_mark_func = current_object_ops.copy_or_mark_object;
2997 scrrjd_normal->scan_func = current_object_ops.scan_object;
2998 scrrjd_normal->heap_start = heap_start;
2999 scrrjd_normal->heap_end = heap_end;
3000 scrrjd_normal->root_type = ROOT_TYPE_NORMAL;
3001 sgen_workers_enqueue_job (job_scan_from_registered_roots, scrrjd_normal);
3003 scrrjd_wbarrier = sgen_alloc_internal_dynamic (sizeof (ScanFromRegisteredRootsJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
3004 scrrjd_wbarrier->copy_or_mark_func = current_object_ops.copy_or_mark_object;
3005 scrrjd_wbarrier->scan_func = current_object_ops.scan_object;
3006 scrrjd_wbarrier->heap_start = heap_start;
3007 scrrjd_wbarrier->heap_end = heap_end;
3008 scrrjd_wbarrier->root_type = ROOT_TYPE_WBARRIER;
3009 sgen_workers_enqueue_job (job_scan_from_registered_roots, scrrjd_wbarrier);
3012 time_major_scan_registered_roots += TV_ELAPSED (atv, btv);
3015 stdjd = sgen_alloc_internal_dynamic (sizeof (ScanThreadDataJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
3016 stdjd->heap_start = heap_start;
3017 stdjd->heap_end = heap_end;
3018 sgen_workers_enqueue_job (job_scan_thread_data, stdjd);
3021 time_major_scan_thread_data += TV_ELAPSED (btv, atv);
3024 time_major_scan_alloc_pinned += TV_ELAPSED (atv, btv);
3026 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
3027 report_finalizer_roots ();
3029 /* scan the list of objects ready for finalization */
3030 sfejd_fin_ready = sgen_alloc_internal_dynamic (sizeof (ScanFinalizerEntriesJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
3031 sfejd_fin_ready->list = fin_ready_list;
3032 sgen_workers_enqueue_job (job_scan_finalizer_entries, sfejd_fin_ready);
3034 sfejd_critical_fin = sgen_alloc_internal_dynamic (sizeof (ScanFinalizerEntriesJobData), INTERNAL_MEM_WORKER_JOB_DATA, TRUE);
3035 sfejd_critical_fin->list = critical_fin_list;
3036 sgen_workers_enqueue_job (job_scan_finalizer_entries, sfejd_critical_fin);
3038 if (scan_mod_union) {
3039 g_assert (finish_up_concurrent_mark);
3041 /* Mod union card table */
3042 sgen_workers_enqueue_job (job_scan_major_mod_union_cardtable, NULL);
3043 sgen_workers_enqueue_job (job_scan_los_mod_union_cardtable, NULL);
3047 time_major_scan_finalized += TV_ELAPSED (btv, atv);
3048 SGEN_LOG (2, "Root scan: %d usecs", TV_ELAPSED (btv, atv));
3051 time_major_scan_big_objects += TV_ELAPSED (atv, btv);
3053 if (major_collector.is_concurrent) {
3054 /* prepare the pin queue for the next collection */
3055 sgen_finish_pinning ();
3057 sgen_pin_stats_reset ();
3059 if (do_concurrent_checks)
3060 check_nursery_is_clean ();
3065 major_start_collection (int *old_next_pin_slot)
3067 MONO_GC_BEGIN (GENERATION_OLD);
3068 binary_protocol_collection_begin (stat_major_gcs, GENERATION_OLD);
3070 current_collection_generation = GENERATION_OLD;
3071 #ifndef DISABLE_PERFCOUNTERS
3072 mono_perfcounters->gc_collections1++;
3075 g_assert (sgen_section_gray_queue_is_empty (sgen_workers_get_distribute_section_gray_queue ()));
3077 if (major_collector.is_concurrent) {
3078 concurrent_collection_in_progress = TRUE;
3080 sgen_cement_concurrent_start ();
3083 current_object_ops = major_collector.major_ops;
3085 reset_pinned_from_failed_allocation ();
3087 sgen_memgov_major_collection_start ();
3089 //count_ref_nonref_objs ();
3090 //consistency_check ();
3092 check_scan_starts ();
3095 SGEN_LOG (1, "Start major collection %d", stat_major_gcs);
3097 gc_stats.major_gc_count ++;
3099 if (major_collector.start_major_collection)
3100 major_collector.start_major_collection ();
3102 major_copy_or_mark_from_roots (old_next_pin_slot, FALSE, FALSE);
3106 wait_for_workers_to_finish (void)
3108 g_assert (sgen_gray_object_queue_is_empty (&remember_major_objects_gray_queue));
3110 if (major_collector.is_parallel || major_collector.is_concurrent) {
3111 gray_queue_redirect (&gray_queue);
3112 sgen_workers_join ();
3115 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
3117 #ifdef SGEN_DEBUG_INTERNAL_ALLOC
3118 main_gc_thread = NULL;
3123 major_finish_collection (const char *reason, int old_next_pin_slot, gboolean scan_mod_union)
3125 LOSObject *bigobj, *prevbo;
3128 char *heap_start = NULL;
3129 char *heap_end = (char*)-1;
3133 if (major_collector.is_concurrent || major_collector.is_parallel)
3134 wait_for_workers_to_finish ();
3136 current_object_ops = major_collector.major_ops;
3138 if (major_collector.is_concurrent) {
3139 major_copy_or_mark_from_roots (NULL, TRUE, scan_mod_union);
3140 wait_for_workers_to_finish ();
3142 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
3144 if (do_concurrent_checks)
3145 check_nursery_is_clean ();
3149 * The workers have stopped so we need to finish gray queue
3150 * work that might result from finalization in the main GC
3151 * thread. Redirection must therefore be turned off.
3153 sgen_gray_object_queue_disable_alloc_prepare (&gray_queue);
3154 g_assert (sgen_section_gray_queue_is_empty (sgen_workers_get_distribute_section_gray_queue ()));
3156 /* all the objects in the heap */
3157 finish_gray_stack (heap_start, heap_end, GENERATION_OLD, &gray_queue);
3159 time_major_finish_gray_stack += TV_ELAPSED (btv, atv);
3162 * The (single-threaded) finalization code might have done
3163 * some copying/marking so we can only reset the GC thread's
3164 * worker data here instead of earlier when we joined the
3167 sgen_workers_reset_data ();
3169 if (objects_pinned) {
3170 g_assert (!major_collector.is_concurrent);
3172 /*This is slow, but we just OOM'd*/
3173 sgen_pin_queue_clear_discarded_entries (nursery_section, old_next_pin_slot);
3174 sgen_optimize_pin_queue (0);
3175 sgen_find_section_pin_queue_start_end (nursery_section);
3179 reset_heap_boundaries ();
3180 sgen_update_heap_boundaries ((mword)sgen_get_nursery_start (), (mword)sgen_get_nursery_end ());
3182 if (check_mark_bits_after_major_collection)
3183 sgen_check_major_heap_marked ();
3185 MONO_GC_SWEEP_BEGIN (GENERATION_OLD, !major_collector.sweeps_lazily);
3187 /* sweep the big objects list */
3189 for (bigobj = los_object_list; bigobj;) {
3190 g_assert (!object_is_pinned (bigobj->data));
3191 if (sgen_los_object_is_pinned (bigobj->data)) {
3192 sgen_los_unpin_object (bigobj->data);
3193 sgen_update_heap_boundaries ((mword)bigobj->data, (mword)bigobj->data + sgen_los_object_size (bigobj));
3196 /* not referenced anywhere, so we can free it */
3198 prevbo->next = bigobj->next;
3200 los_object_list = bigobj->next;
3202 bigobj = bigobj->next;
3203 sgen_los_free_object (to_free);
3207 bigobj = bigobj->next;
3211 time_major_free_bigobjs += TV_ELAPSED (atv, btv);
3216 time_major_los_sweep += TV_ELAPSED (btv, atv);
3218 major_collector.sweep ();
3220 MONO_GC_SWEEP_END (GENERATION_OLD, !major_collector.sweeps_lazily);
3223 time_major_sweep += TV_ELAPSED (atv, btv);
3225 if (!major_collector.is_concurrent) {
3226 /* walk the pin_queue, build up the fragment list of free memory, unmark
3227 * pinned objects as we go, memzero() the empty fragments so they are ready for the
3230 if (!sgen_build_nursery_fragments (nursery_section, nursery_section->pin_queue_start, nursery_section->pin_queue_num_entries, NULL))
3233 /* prepare the pin queue for the next collection */
3234 sgen_finish_pinning ();
3236 /* Clear TLABs for all threads */
3237 sgen_clear_tlabs ();
3239 sgen_pin_stats_reset ();
3242 if (major_collector.is_concurrent)
3243 sgen_cement_concurrent_finish ();
3244 sgen_cement_clear_below_threshold ();
3247 time_major_fragment_creation += TV_ELAPSED (btv, atv);
3250 dump_heap ("major", stat_major_gcs - 1, reason);
3252 if (fin_ready_list || critical_fin_list) {
3253 SGEN_LOG (4, "Finalizer-thread wakeup: ready %d", num_ready_finalizers);
3254 mono_gc_finalize_notify ();
3257 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
3259 sgen_memgov_major_collection_end ();
3260 current_collection_generation = -1;
3262 major_collector.finish_major_collection ();
3264 g_assert (sgen_section_gray_queue_is_empty (sgen_workers_get_distribute_section_gray_queue ()));
3266 if (major_collector.is_concurrent)
3267 concurrent_collection_in_progress = FALSE;
3269 check_scan_starts ();
3271 binary_protocol_flush_buffers (FALSE);
3273 //consistency_check ();
3275 MONO_GC_END (GENERATION_OLD);
3276 binary_protocol_collection_end (stat_major_gcs - 1, GENERATION_OLD);
3280 major_do_collection (const char *reason)
3282 TV_DECLARE (all_atv);
3283 TV_DECLARE (all_btv);
3284 int old_next_pin_slot;
3286 if (major_collector.get_and_reset_num_major_objects_marked) {
3287 long long num_marked = major_collector.get_and_reset_num_major_objects_marked ();
3288 g_assert (!num_marked);
3291 /* world must be stopped already */
3292 TV_GETTIME (all_atv);
3294 major_start_collection (&old_next_pin_slot);
3295 major_finish_collection (reason, old_next_pin_slot, FALSE);
3297 TV_GETTIME (all_btv);
3298 gc_stats.major_gc_time_usecs += TV_ELAPSED (all_atv, all_btv);
3300 /* FIXME: also report this to the user, preferably in gc-end. */
3301 if (major_collector.get_and_reset_num_major_objects_marked)
3302 major_collector.get_and_reset_num_major_objects_marked ();
3304 return bytes_pinned_from_failed_allocation > 0;
3307 static gboolean major_do_collection (const char *reason);
3310 major_start_concurrent_collection (const char *reason)
3312 long long num_objects_marked = major_collector.get_and_reset_num_major_objects_marked ();
3314 g_assert (num_objects_marked == 0);
3316 MONO_GC_CONCURRENT_START_BEGIN (GENERATION_OLD);
3318 // FIXME: store reason and pass it when finishing
3319 major_start_collection (NULL);
3321 gray_queue_redirect (&gray_queue);
3322 sgen_workers_wait_for_jobs ();
3324 num_objects_marked = major_collector.get_and_reset_num_major_objects_marked ();
3325 MONO_GC_CONCURRENT_START_END (GENERATION_OLD, num_objects_marked);
3327 current_collection_generation = -1;
3331 major_update_or_finish_concurrent_collection (gboolean force_finish)
3333 SgenGrayQueue unpin_queue;
3334 memset (&unpin_queue, 0, sizeof (unpin_queue));
3336 MONO_GC_CONCURRENT_UPDATE_FINISH_BEGIN (GENERATION_OLD, major_collector.get_and_reset_num_major_objects_marked ());
3338 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
3339 if (!have_non_collection_major_object_remembers)
3340 g_assert (sgen_gray_object_queue_is_empty (&remember_major_objects_gray_queue));
3342 major_collector.update_cardtable_mod_union ();
3343 sgen_los_update_cardtable_mod_union ();
3345 if (!force_finish && !sgen_workers_all_done ()) {
3346 MONO_GC_CONCURRENT_UPDATE_END (GENERATION_OLD, major_collector.get_and_reset_num_major_objects_marked ());
3350 collect_nursery (&unpin_queue, TRUE);
3351 redirect_major_object_remembers ();
3353 current_collection_generation = GENERATION_OLD;
3354 major_finish_collection ("finishing", -1, TRUE);
3356 if (whole_heap_check_before_collection)
3357 sgen_check_whole_heap (FALSE);
3359 unpin_objects_from_queue (&unpin_queue);
3360 sgen_gray_object_queue_deinit (&unpin_queue);
3362 MONO_GC_CONCURRENT_FINISH_END (GENERATION_OLD, major_collector.get_and_reset_num_major_objects_marked ());
3364 current_collection_generation = -1;
3370 * Ensure an allocation request for @size will succeed by freeing enough memory.
3372 * LOCKING: The GC lock MUST be held.
3375 sgen_ensure_free_space (size_t size)
3377 int generation_to_collect = -1;
3378 const char *reason = NULL;
3381 if (size > SGEN_MAX_SMALL_OBJ_SIZE) {
3382 if (sgen_need_major_collection (size)) {
3383 reason = "LOS overflow";
3384 generation_to_collect = GENERATION_OLD;
3387 if (degraded_mode) {
3388 if (sgen_need_major_collection (size)) {
3389 reason = "Degraded mode overflow";
3390 generation_to_collect = GENERATION_OLD;
3392 } else if (sgen_need_major_collection (size)) {
3393 reason = "Minor allowance";
3394 generation_to_collect = GENERATION_OLD;
3396 generation_to_collect = GENERATION_NURSERY;
3397 reason = "Nursery full";
3401 if (generation_to_collect == -1) {
3402 if (concurrent_collection_in_progress && sgen_workers_all_done ()) {
3403 generation_to_collect = GENERATION_OLD;
3404 reason = "Finish concurrent collection";
3408 if (generation_to_collect == -1)
3410 sgen_perform_collection (size, generation_to_collect, reason, FALSE);
3414 sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish)
3416 TV_DECLARE (gc_end);
3417 GGTimingInfo infos [2];
3418 int overflow_generation_to_collect = -1;
3419 int oldest_generation_collected = generation_to_collect;
3420 const char *overflow_reason = NULL;
3422 MONO_GC_REQUESTED (generation_to_collect, requested_size, wait_to_finish ? 1 : 0);
3424 g_assert (generation_to_collect == GENERATION_NURSERY || generation_to_collect == GENERATION_OLD);
3426 if (have_non_collection_major_object_remembers) {
3427 g_assert (concurrent_collection_in_progress);
3428 redirect_major_object_remembers ();
3431 memset (infos, 0, sizeof (infos));
3432 mono_profiler_gc_event (MONO_GC_EVENT_START, generation_to_collect);
3434 infos [0].generation = generation_to_collect;
3435 infos [0].reason = reason;
3436 infos [0].is_overflow = FALSE;
3437 TV_GETTIME (infos [0].total_time);
3438 infos [1].generation = -1;
3440 sgen_stop_world (generation_to_collect);
3442 if (concurrent_collection_in_progress) {
3443 if (major_update_or_finish_concurrent_collection (wait_to_finish && generation_to_collect == GENERATION_OLD)) {
3444 oldest_generation_collected = GENERATION_OLD;
3447 if (generation_to_collect == GENERATION_OLD)
3451 //FIXME extract overflow reason
3452 if (generation_to_collect == GENERATION_NURSERY) {
3453 if (collect_nursery (NULL, FALSE)) {
3454 overflow_generation_to_collect = GENERATION_OLD;
3455 overflow_reason = "Minor overflow";
3457 if (concurrent_collection_in_progress) {
3458 redirect_major_object_remembers ();
3459 sgen_workers_wake_up_all ();
3462 SgenGrayQueue unpin_queue;
3463 SgenGrayQueue *unpin_queue_ptr;
3464 memset (&unpin_queue, 0, sizeof (unpin_queue));
3466 if (major_collector.is_concurrent && wait_to_finish)
3467 unpin_queue_ptr = &unpin_queue;
3469 unpin_queue_ptr = NULL;
3471 if (major_collector.is_concurrent) {
3472 g_assert (!concurrent_collection_in_progress);
3473 collect_nursery (unpin_queue_ptr, FALSE);
3476 if (major_collector.is_concurrent && !wait_to_finish) {
3477 major_start_concurrent_collection (reason);
3478 // FIXME: set infos[0] properly
3481 if (major_do_collection (reason)) {
3482 overflow_generation_to_collect = GENERATION_NURSERY;
3483 overflow_reason = "Excessive pinning";
3487 if (unpin_queue_ptr) {
3488 unpin_objects_from_queue (unpin_queue_ptr);
3489 sgen_gray_object_queue_deinit (unpin_queue_ptr);
3493 TV_GETTIME (gc_end);
3494 infos [0].total_time = SGEN_TV_ELAPSED (infos [0].total_time, gc_end);
3497 if (!major_collector.is_concurrent && overflow_generation_to_collect != -1) {
3498 mono_profiler_gc_event (MONO_GC_EVENT_START, overflow_generation_to_collect);
3499 infos [1].generation = overflow_generation_to_collect;
3500 infos [1].reason = overflow_reason;
3501 infos [1].is_overflow = TRUE;
3502 infos [1].total_time = gc_end;
3504 if (overflow_generation_to_collect == GENERATION_NURSERY)
3505 collect_nursery (NULL, FALSE);
3507 major_do_collection (overflow_reason);
3509 TV_GETTIME (gc_end);
3510 infos [1].total_time = SGEN_TV_ELAPSED (infos [1].total_time, gc_end);
3512 /* keep events symmetric */
3513 mono_profiler_gc_event (MONO_GC_EVENT_END, overflow_generation_to_collect);
3515 oldest_generation_collected = MAX (oldest_generation_collected, overflow_generation_to_collect);
3518 SGEN_LOG (2, "Heap size: %lu, LOS size: %lu", (unsigned long)mono_gc_get_heap_size (), (unsigned long)los_memory_usage);
3520 /* this also sets the proper pointers for the next allocation */
3521 if (generation_to_collect == GENERATION_NURSERY && !sgen_can_alloc_size (requested_size)) {
3522 /* TypeBuilder and MonoMethod are killing mcs with fragmentation */
3523 SGEN_LOG (1, "nursery collection didn't find enough room for %zd alloc (%d pinned)", requested_size, sgen_get_pinned_count ());
3524 sgen_dump_pin_queue ();
3529 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
3530 g_assert (sgen_gray_object_queue_is_empty (&remember_major_objects_gray_queue));
3532 sgen_restart_world (oldest_generation_collected, infos);
3534 mono_profiler_gc_event (MONO_GC_EVENT_END, generation_to_collect);
3538 * ######################################################################
3539 * ######## Memory allocation from the OS
3540 * ######################################################################
3541 * This section of code deals with getting memory from the OS and
3542 * allocating memory for GC-internal data structures.
3543 * Internal memory can be handled with a freelist for small objects.
3549 G_GNUC_UNUSED static void
3550 report_internal_mem_usage (void)
3552 printf ("Internal memory usage:\n");
3553 sgen_report_internal_mem_usage ();
3554 printf ("Pinned memory usage:\n");
3555 major_collector.report_pinned_memory_usage ();
3559 * ######################################################################
3560 * ######## Finalization support
3561 * ######################################################################
3564 static inline gboolean
3565 sgen_major_is_object_alive (void *object)
3569 /* Oldgen objects can be pinned and forwarded too */
3570 if (SGEN_OBJECT_IS_PINNED (object) || SGEN_OBJECT_IS_FORWARDED (object))
3574 * FIXME: major_collector.is_object_live() also calculates the
3575 * size. Avoid the double calculation.
3577 objsize = SGEN_ALIGN_UP (sgen_safe_object_get_size ((MonoObject*)object));
3578 if (objsize > SGEN_MAX_SMALL_OBJ_SIZE)
3579 return sgen_los_object_is_pinned (object);
3581 return major_collector.is_object_live (object);
3585 * If the object has been forwarded it means it's still referenced from a root.
3586 * If it is pinned it's still alive as well.
3587 * A LOS object is only alive if we have pinned it.
3588 * Return TRUE if @obj is ready to be finalized.
3590 static inline gboolean
3591 sgen_is_object_alive (void *object)
3593 if (ptr_in_nursery (object))
3594 return sgen_nursery_is_object_alive (object);
3596 return sgen_major_is_object_alive (object);
3600 * This function returns true if @object is either alive or it belongs to the old gen
3601 * and we're currently doing a minor collection.
3604 sgen_is_object_alive_for_current_gen (char *object)
3606 if (ptr_in_nursery (object))
3607 return sgen_nursery_is_object_alive (object);
3609 if (current_collection_generation == GENERATION_NURSERY)
3612 return sgen_major_is_object_alive (object);
3616 * This function returns true if @object is either alive and belongs to the
3617 * current collection - major collections are full heap, so old gen objects
3618 * are never alive during a minor collection.
3621 sgen_is_object_alive_and_on_current_collection (char *object)
3623 if (ptr_in_nursery (object))
3624 return sgen_nursery_is_object_alive (object);
3626 if (current_collection_generation == GENERATION_NURSERY)
3629 return sgen_major_is_object_alive (object);
3634 sgen_gc_is_object_ready_for_finalization (void *object)
3636 return !sgen_is_object_alive (object);
3640 has_critical_finalizer (MonoObject *obj)
3644 if (!mono_defaults.critical_finalizer_object)
3647 class = ((MonoVTable*)LOAD_VTABLE (obj))->klass;
3649 return mono_class_has_parent_fast (class, mono_defaults.critical_finalizer_object);
3653 sgen_queue_finalization_entry (MonoObject *obj)
3655 FinalizeReadyEntry *entry = sgen_alloc_internal (INTERNAL_MEM_FINALIZE_READY_ENTRY);
3656 gboolean critical = has_critical_finalizer (obj);
3657 entry->object = obj;
3659 entry->next = critical_fin_list;
3660 critical_fin_list = entry;
3662 entry->next = fin_ready_list;
3663 fin_ready_list = entry;
3666 #ifdef ENABLE_DTRACE
3667 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
3668 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
3669 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (obj);
3670 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
3671 vt->klass->name_space, vt->klass->name, gen, critical);
3677 sgen_object_is_live (void *obj)
3679 return sgen_is_object_alive_and_on_current_collection (obj);
3682 /* LOCKING: requires that the GC lock is held */
3684 null_ephemerons_for_domain (MonoDomain *domain)
3686 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
3689 MonoObject *object = (MonoObject*)current->array;
3691 if (object && !object->vtable) {
3692 EphemeronLinkNode *tmp = current;
3695 prev->next = current->next;
3697 ephemeron_list = current->next;
3699 current = current->next;
3700 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
3703 current = current->next;
3708 /* LOCKING: requires that the GC lock is held */
3710 clear_unreachable_ephemerons (gboolean concurrent_cementing, ScanCopyContext ctx)
3712 CopyOrMarkObjectFunc copy_func = ctx.copy_func;
3713 GrayQueue *queue = ctx.queue;
3714 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
3716 Ephemeron *cur, *array_end;
3720 char *object = current->array;
3722 if (!sgen_is_object_alive_for_current_gen (object)) {
3723 EphemeronLinkNode *tmp = current;
3725 SGEN_LOG (5, "Dead Ephemeron array at %p", object);
3728 prev->next = current->next;
3730 ephemeron_list = current->next;
3732 current = current->next;
3733 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
3738 copy_func ((void**)&object, queue);
3739 current->array = object;
3741 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", object);
3743 array = (MonoArray*)object;
3744 cur = mono_array_addr (array, Ephemeron, 0);
3745 array_end = cur + mono_array_length_fast (array);
3746 tombstone = (char*)((MonoVTable*)LOAD_VTABLE (object))->domain->ephemeron_tombstone;
3748 for (; cur < array_end; ++cur) {
3749 char *key = (char*)cur->key;
3751 if (!key || key == tombstone)
3754 SGEN_LOG (5, "[%td] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
3755 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
3756 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
3758 if (!sgen_is_object_alive_for_current_gen (key)) {
3759 cur->key = tombstone;
3765 current = current->next;
3770 LOCKING: requires that the GC lock is held
3772 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
3775 mark_ephemerons_in_range (ScanCopyContext ctx)
3777 CopyOrMarkObjectFunc copy_func = ctx.copy_func;
3778 GrayQueue *queue = ctx.queue;
3779 int nothing_marked = 1;
3780 EphemeronLinkNode *current = ephemeron_list;
3782 Ephemeron *cur, *array_end;
3785 for (current = ephemeron_list; current; current = current->next) {
3786 char *object = current->array;
3787 SGEN_LOG (5, "Ephemeron array at %p", object);
3789 /*It has to be alive*/
3790 if (!sgen_is_object_alive_for_current_gen (object)) {
3791 SGEN_LOG (5, "\tnot reachable");
3795 copy_func ((void**)&object, queue);
3797 array = (MonoArray*)object;
3798 cur = mono_array_addr (array, Ephemeron, 0);
3799 array_end = cur + mono_array_length_fast (array);
3800 tombstone = (char*)((MonoVTable*)LOAD_VTABLE (object))->domain->ephemeron_tombstone;
3802 for (; cur < array_end; ++cur) {
3803 char *key = cur->key;
3805 if (!key || key == tombstone)
3808 SGEN_LOG (5, "[%td] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
3809 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
3810 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
3812 if (sgen_is_object_alive_for_current_gen (key)) {
3813 char *value = cur->value;
3815 copy_func ((void**)&cur->key, queue);
3817 if (!sgen_is_object_alive_for_current_gen (value))
3819 copy_func ((void**)&cur->value, queue);
3825 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
3826 return nothing_marked;
3830 mono_gc_invoke_finalizers (void)
3832 FinalizeReadyEntry *entry = NULL;
3833 gboolean entry_is_critical = FALSE;
3836 /* FIXME: batch to reduce lock contention */
3837 while (fin_ready_list || critical_fin_list) {
3841 FinalizeReadyEntry **list = entry_is_critical ? &critical_fin_list : &fin_ready_list;
3843 /* We have finalized entry in the last
3844 interation, now we need to remove it from
3847 *list = entry->next;
3849 FinalizeReadyEntry *e = *list;
3850 while (e->next != entry)
3852 e->next = entry->next;
3854 sgen_free_internal (entry, INTERNAL_MEM_FINALIZE_READY_ENTRY);
3858 /* Now look for the first non-null entry. */
3859 for (entry = fin_ready_list; entry && !entry->object; entry = entry->next)
3862 entry_is_critical = FALSE;
3864 entry_is_critical = TRUE;
3865 for (entry = critical_fin_list; entry && !entry->object; entry = entry->next)
3870 g_assert (entry->object);
3871 num_ready_finalizers--;
3872 obj = entry->object;
3873 entry->object = NULL;
3874 SGEN_LOG (7, "Finalizing object %p (%s)", obj, safe_name (obj));
3882 g_assert (entry->object == NULL);
3884 /* the object is on the stack so it is pinned */
3885 /*g_print ("Calling finalizer for object: %p (%s)\n", entry->object, safe_name (entry->object));*/
3886 mono_gc_run_finalize (obj, NULL);
3893 mono_gc_pending_finalizers (void)
3895 return fin_ready_list || critical_fin_list;
3899 * ######################################################################
3900 * ######## registered roots support
3901 * ######################################################################
3905 * We do not coalesce roots.
3908 mono_gc_register_root_inner (char *start, size_t size, void *descr, int root_type)
3910 RootRecord new_root;
3913 for (i = 0; i < ROOT_TYPE_NUM; ++i) {
3914 RootRecord *root = sgen_hash_table_lookup (&roots_hash [i], start);
3915 /* we allow changing the size and the descriptor (for thread statics etc) */
3917 size_t old_size = root->end_root - start;
3918 root->end_root = start + size;
3919 g_assert (((root->root_desc != 0) && (descr != NULL)) ||
3920 ((root->root_desc == 0) && (descr == NULL)));
3921 root->root_desc = (mword)descr;
3923 roots_size -= old_size;
3929 new_root.end_root = start + size;
3930 new_root.root_desc = (mword)descr;
3932 sgen_hash_table_replace (&roots_hash [root_type], start, &new_root, NULL);
3935 SGEN_LOG (3, "Added root for range: %p-%p, descr: %p (%d/%d bytes)", start, new_root.end_root, descr, (int)size, (int)roots_size);
3942 mono_gc_register_root (char *start, size_t size, void *descr)
3944 return mono_gc_register_root_inner (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED);
3948 mono_gc_register_root_wbarrier (char *start, size_t size, void *descr)
3950 return mono_gc_register_root_inner (start, size, descr, ROOT_TYPE_WBARRIER);
3954 mono_gc_deregister_root (char* addr)
3960 for (root_type = 0; root_type < ROOT_TYPE_NUM; ++root_type) {
3961 if (sgen_hash_table_remove (&roots_hash [root_type], addr, &root))
3962 roots_size -= (root.end_root - addr);
3968 * ######################################################################
3969 * ######## Thread handling (stop/start code)
3970 * ######################################################################
3973 unsigned int sgen_global_stop_count = 0;
3976 sgen_fill_thread_info_for_suspend (SgenThreadInfo *info)
3978 if (remset.fill_thread_info_for_suspend)
3979 remset.fill_thread_info_for_suspend (info);
3983 sgen_get_current_collection_generation (void)
3985 return current_collection_generation;
3989 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
3991 gc_callbacks = *callbacks;
3995 mono_gc_get_gc_callbacks ()
3997 return &gc_callbacks;
4000 /* Variables holding start/end nursery so it won't have to be passed at every call */
4001 static void *scan_area_arg_start, *scan_area_arg_end;
4004 mono_gc_conservatively_scan_area (void *start, void *end)
4006 conservatively_pin_objects_from (start, end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
4010 mono_gc_scan_object (void *obj)
4012 UserCopyOrMarkData *data = mono_native_tls_get_value (user_copy_or_mark_key);
4013 current_object_ops.copy_or_mark_object (&obj, data->queue);
4018 * Mark from thread stacks and registers.
4021 scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, GrayQueue *queue)
4023 SgenThreadInfo *info;
4025 scan_area_arg_start = start_nursery;
4026 scan_area_arg_end = end_nursery;
4028 FOREACH_THREAD (info) {
4030 SGEN_LOG (3, "Skipping dead thread %p, range: %p-%p, size: %td", info, info->stack_start, info->stack_end, (char*)info->stack_end - (char*)info->stack_start);
4033 if (info->gc_disabled) {
4034 SGEN_LOG (3, "GC disabled for thread %p, range: %p-%p, size: %td", info, info->stack_start, info->stack_end, (char*)info->stack_end - (char*)info->stack_start);
4038 if (!info->joined_stw) {
4039 SGEN_LOG (3, "Skipping thread not seen in STW %p, range: %p-%p, size: %td", info, info->stack_start, info->stack_end, (char*)info->stack_end - (char*)info->stack_start);
4043 SGEN_LOG (3, "Scanning thread %p, range: %p-%p, size: %td, pinned=%d", info, info->stack_start, info->stack_end, (char*)info->stack_end - (char*)info->stack_start, sgen_get_pinned_count ());
4044 if (!info->thread_is_dying) {
4045 if (gc_callbacks.thread_mark_func && !conservative_stack_mark) {
4046 UserCopyOrMarkData data = { NULL, queue };
4047 set_user_copy_or_mark_data (&data);
4048 gc_callbacks.thread_mark_func (info->runtime_data, info->stack_start, info->stack_end, precise);
4049 set_user_copy_or_mark_data (NULL);
4050 } else if (!precise) {
4051 if (!conservative_stack_mark) {
4052 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
4053 conservative_stack_mark = TRUE;
4055 conservatively_pin_objects_from (info->stack_start, info->stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
4059 if (!info->thread_is_dying && !precise) {
4061 conservatively_pin_objects_from ((void**)&info->ctx, (void**)&info->ctx + ARCH_NUM_REGS,
4062 start_nursery, end_nursery, PIN_TYPE_STACK);
4064 conservatively_pin_objects_from (&info->regs, &info->regs + ARCH_NUM_REGS,
4065 start_nursery, end_nursery, PIN_TYPE_STACK);
4068 } END_FOREACH_THREAD
4072 ptr_on_stack (void *ptr)
4074 gpointer stack_start = &stack_start;
4075 SgenThreadInfo *info = mono_thread_info_current ();
4077 if (ptr >= stack_start && ptr < (gpointer)info->stack_end)
4083 sgen_thread_register (SgenThreadInfo* info, void *addr)
4085 #ifndef HAVE_KW_THREAD
4086 SgenThreadInfo *__thread_info__ = info;
4090 #ifndef HAVE_KW_THREAD
4091 info->tlab_start = info->tlab_next = info->tlab_temp_end = info->tlab_real_end = NULL;
4093 g_assert (!mono_native_tls_get_value (thread_info_key));
4094 mono_native_tls_set_value (thread_info_key, info);
4096 sgen_thread_info = info;
4099 #if !defined(__MACH__)
4100 info->stop_count = -1;
4104 info->joined_stw = FALSE;
4105 info->doing_handshake = FALSE;
4106 info->thread_is_dying = FALSE;
4107 info->stack_start = NULL;
4108 info->store_remset_buffer_addr = &STORE_REMSET_BUFFER;
4109 info->store_remset_buffer_index_addr = &STORE_REMSET_BUFFER_INDEX;
4110 info->stopped_ip = NULL;
4111 info->stopped_domain = NULL;
4113 memset (&info->ctx, 0, sizeof (MonoContext));
4115 memset (&info->regs, 0, sizeof (info->regs));
4118 sgen_init_tlab_info (info);
4120 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
4122 #ifdef HAVE_KW_THREAD
4123 store_remset_buffer_index_addr = &store_remset_buffer_index;
4126 /* try to get it with attributes first */
4127 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
4131 pthread_attr_t attr;
4132 pthread_getattr_np (pthread_self (), &attr);
4133 pthread_attr_getstack (&attr, &sstart, &size);
4134 info->stack_start_limit = sstart;
4135 info->stack_end = (char*)sstart + size;
4136 pthread_attr_destroy (&attr);
4138 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
4139 info->stack_end = (char*)pthread_get_stackaddr_np (pthread_self ());
4140 info->stack_start_limit = (char*)info->stack_end - pthread_get_stacksize_np (pthread_self ());
4143 /* FIXME: we assume the stack grows down */
4144 gsize stack_bottom = (gsize)addr;
4145 stack_bottom += 4095;
4146 stack_bottom &= ~4095;
4147 info->stack_end = (char*)stack_bottom;
4151 #ifdef HAVE_KW_THREAD
4152 stack_end = info->stack_end;
4155 if (remset.register_thread)
4156 remset.register_thread (info);
4158 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->stack_end);
4160 if (gc_callbacks.thread_attach_func)
4161 info->runtime_data = gc_callbacks.thread_attach_func ();
4168 sgen_wbarrier_cleanup_thread (SgenThreadInfo *p)
4170 if (remset.cleanup_thread)
4171 remset.cleanup_thread (p);
4175 sgen_thread_unregister (SgenThreadInfo *p)
4177 /* If a delegate is passed to native code and invoked on a thread we dont
4178 * know about, the jit will register it with mono_jit_thread_attach, but
4179 * we have no way of knowing when that thread goes away. SGen has a TSD
4180 * so we assume that if the domain is still registered, we can detach
4183 if (mono_domain_get ())
4184 mono_thread_detach (mono_thread_current ());
4186 p->thread_is_dying = TRUE;
4189 There is a race condition between a thread finishing executing and been removed
4190 from the GC thread set.
4191 This happens on posix systems when TLS data is been cleaned-up, libpthread will
4192 set the thread_info slot to NULL before calling the cleanup function. This
4193 opens a window in which the thread is registered but has a NULL TLS.
4195 The suspend signal handler needs TLS data to know where to store thread state
4196 data or otherwise it will simply ignore the thread.
4198 This solution works because the thread doing STW will wait until all threads been
4199 suspended handshake back, so there is no race between the doing_hankshake test
4200 and the suspend_thread call.
4202 This is not required on systems that do synchronous STW as those can deal with
4203 the above race at suspend time.
4205 FIXME: I believe we could avoid this by using mono_thread_info_lookup when
4206 mono_thread_info_current returns NULL. Or fix mono_thread_info_lookup to do so.
4208 #if (defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED) || !defined(HAVE_PTHREAD_KILL)
4211 while (!TRYLOCK_GC) {
4212 if (!sgen_park_current_thread_if_doing_handshake (p))
4218 binary_protocol_thread_unregister ((gpointer)mono_thread_info_get_tid (p));
4219 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)mono_thread_info_get_tid (p));
4221 if (gc_callbacks.thread_detach_func) {
4222 gc_callbacks.thread_detach_func (p->runtime_data);
4223 p->runtime_data = NULL;
4225 sgen_wbarrier_cleanup_thread (p);
4227 mono_threads_unregister_current_thread (p);
4233 sgen_thread_attach (SgenThreadInfo *info)
4236 /*this is odd, can we get attached before the gc is inited?*/
4240 if (gc_callbacks.thread_attach_func && !info->runtime_data)
4241 info->runtime_data = gc_callbacks.thread_attach_func ();
4244 mono_gc_register_thread (void *baseptr)
4246 return mono_thread_info_attach (baseptr) != NULL;
4250 * mono_gc_set_stack_end:
4252 * Set the end of the current threads stack to STACK_END. The stack space between
4253 * STACK_END and the real end of the threads stack will not be scanned during collections.
4256 mono_gc_set_stack_end (void *stack_end)
4258 SgenThreadInfo *info;
4261 info = mono_thread_info_current ();
4263 g_assert (stack_end < info->stack_end);
4264 info->stack_end = stack_end;
4269 #if USE_PTHREAD_INTERCEPT
4273 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
4275 return pthread_create (new_thread, attr, start_routine, arg);
4279 mono_gc_pthread_join (pthread_t thread, void **retval)
4281 return pthread_join (thread, retval);
4285 mono_gc_pthread_detach (pthread_t thread)
4287 return pthread_detach (thread);
4291 mono_gc_pthread_exit (void *retval)
4293 pthread_exit (retval);
4296 #endif /* USE_PTHREAD_INTERCEPT */
4299 * ######################################################################
4300 * ######## Write barriers
4301 * ######################################################################
4305 * Note: the write barriers first do the needed GC work and then do the actual store:
4306 * this way the value is visible to the conservative GC scan after the write barrier
4307 * itself. If a GC interrupts the barrier in the middle, value will be kept alive by
4308 * the conservative scan, otherwise by the remembered set scan.
4311 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
4313 HEAVY_STAT (++stat_wbarrier_set_field);
4314 if (ptr_in_nursery (field_ptr)) {
4315 *(void**)field_ptr = value;
4318 SGEN_LOG (8, "Adding remset at %p", field_ptr);
4320 binary_protocol_wbarrier (field_ptr, value, value->vtable);
4322 remset.wbarrier_set_field (obj, field_ptr, value);
4326 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
4328 HEAVY_STAT (++stat_wbarrier_set_arrayref);
4329 if (ptr_in_nursery (slot_ptr)) {
4330 *(void**)slot_ptr = value;
4333 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
4335 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
4337 remset.wbarrier_set_arrayref (arr, slot_ptr, value);
4341 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
4343 HEAVY_STAT (++stat_wbarrier_arrayref_copy);
4344 /*This check can be done without taking a lock since dest_ptr array is pinned*/
4345 if (ptr_in_nursery (dest_ptr) || count <= 0) {
4346 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
4350 #ifdef SGEN_BINARY_PROTOCOL
4353 for (i = 0; i < count; ++i) {
4354 gpointer dest = (gpointer*)dest_ptr + i;
4355 gpointer obj = *((gpointer*)src_ptr + i);
4357 binary_protocol_wbarrier (dest, obj, (gpointer)LOAD_VTABLE (obj));
4362 remset.wbarrier_arrayref_copy (dest_ptr, src_ptr, count);
4365 static char *found_obj;
4368 find_object_for_ptr_callback (char *obj, size_t size, void *user_data)
4370 char *ptr = user_data;
4372 if (ptr >= obj && ptr < obj + size) {
4373 g_assert (!found_obj);
4378 /* for use in the debugger */
4379 char* find_object_for_ptr (char *ptr);
4381 find_object_for_ptr (char *ptr)
4383 if (ptr >= nursery_section->data && ptr < nursery_section->end_data) {
4385 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
4386 find_object_for_ptr_callback, ptr, TRUE);
4392 sgen_los_iterate_objects (find_object_for_ptr_callback, ptr);
4397 * Very inefficient, but this is debugging code, supposed to
4398 * be called from gdb, so we don't care.
4401 major_collector.iterate_objects (TRUE, TRUE, find_object_for_ptr_callback, ptr);
4406 mono_gc_wbarrier_generic_nostore (gpointer ptr)
4410 HEAVY_STAT (++stat_wbarrier_generic_store);
4412 #ifdef XDOMAIN_CHECKS_IN_WBARRIER
4413 /* FIXME: ptr_in_heap must be called with the GC lock held */
4414 if (xdomain_checks && *(MonoObject**)ptr && ptr_in_heap (ptr)) {
4415 char *start = find_object_for_ptr (ptr);
4416 MonoObject *value = *(MonoObject**)ptr;
4420 MonoObject *obj = (MonoObject*)start;
4421 if (obj->vtable->domain != value->vtable->domain)
4422 g_assert (is_xdomain_ref_allowed (ptr, start, obj->vtable->domain));
4428 obj = *(gpointer*)ptr;
4430 binary_protocol_wbarrier (ptr, obj, (gpointer)LOAD_VTABLE (obj));
4432 if (ptr_in_nursery (ptr) || ptr_on_stack (ptr)) {
4433 SGEN_LOG (8, "Skipping remset at %p", ptr);
4438 * We need to record old->old pointer locations for the
4439 * concurrent collector.
4441 if (!ptr_in_nursery (obj) && !concurrent_collection_in_progress) {
4442 SGEN_LOG (8, "Skipping remset at %p", ptr);
4446 SGEN_LOG (8, "Adding remset at %p", ptr);
4448 remset.wbarrier_generic_nostore (ptr);
4452 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
4454 SGEN_LOG (8, "Wbarrier store at %p to %p (%s)", ptr, value, value ? safe_name (value) : "null");
4455 *(void**)ptr = value;
4456 if (ptr_in_nursery (value))
4457 mono_gc_wbarrier_generic_nostore (ptr);
4458 sgen_dummy_use (value);
4461 void mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
4463 mword *dest = _dest;
4468 mono_gc_wbarrier_generic_store (dest, (MonoObject*)*src);
4473 size -= SIZEOF_VOID_P;
4478 #ifdef SGEN_BINARY_PROTOCOL
4480 #define HANDLE_PTR(ptr,obj) do { \
4481 gpointer o = *(gpointer*)(ptr); \
4483 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
4484 binary_protocol_wbarrier (d, o, (gpointer) LOAD_VTABLE (o)); \
4489 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
4491 #define SCAN_OBJECT_NOVTABLE
4492 #include "sgen-scan-object.h"
4497 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
4499 HEAVY_STAT (++stat_wbarrier_value_copy);
4500 g_assert (klass->valuetype);
4502 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, klass->gc_descr, klass->name, klass);
4504 if (ptr_in_nursery (dest) || ptr_on_stack (dest) || !SGEN_CLASS_HAS_REFERENCES (klass)) {
4505 size_t element_size = mono_class_value_size (klass, NULL);
4506 size_t size = count * element_size;
4507 mono_gc_memmove (dest, src, size);
4511 #ifdef SGEN_BINARY_PROTOCOL
4513 size_t element_size = mono_class_value_size (klass, NULL);
4515 for (i = 0; i < count; ++i) {
4516 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
4517 (char*)src + i * element_size - sizeof (MonoObject),
4518 (mword) klass->gc_descr);
4523 remset.wbarrier_value_copy (dest, src, count, klass);
4527 * mono_gc_wbarrier_object_copy:
4529 * Write barrier to call when obj is the result of a clone or copy of an object.
4532 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
4536 HEAVY_STAT (++stat_wbarrier_object_copy);
4538 if (ptr_in_nursery (obj) || ptr_on_stack (obj)) {
4539 size = mono_object_class (obj)->instance_size;
4540 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
4541 size - sizeof (MonoObject));
4545 #ifdef SGEN_BINARY_PROTOCOL
4546 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
4549 remset.wbarrier_object_copy (obj, src);
4554 * ######################################################################
4555 * ######## Other mono public interface functions.
4556 * ######################################################################
4559 #define REFS_SIZE 128
4562 MonoGCReferences callback;
4566 MonoObject *refs [REFS_SIZE];
4567 uintptr_t offsets [REFS_SIZE];
4571 #define HANDLE_PTR(ptr,obj) do { \
4573 if (hwi->count == REFS_SIZE) { \
4574 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
4578 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
4579 hwi->refs [hwi->count++] = *(ptr); \
4584 collect_references (HeapWalkInfo *hwi, char *start, size_t size)
4586 #include "sgen-scan-object.h"
4590 walk_references (char *start, size_t size, void *data)
4592 HeapWalkInfo *hwi = data;
4595 collect_references (hwi, start, size);
4596 if (hwi->count || !hwi->called)
4597 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
4601 * mono_gc_walk_heap:
4602 * @flags: flags for future use
4603 * @callback: a function pointer called for each object in the heap
4604 * @data: a user data pointer that is passed to callback
4606 * This function can be used to iterate over all the live objects in the heap:
4607 * for each object, @callback is invoked, providing info about the object's
4608 * location in memory, its class, its size and the objects it references.
4609 * For each referenced object it's offset from the object address is
4610 * reported in the offsets array.
4611 * The object references may be buffered, so the callback may be invoked
4612 * multiple times for the same object: in all but the first call, the size
4613 * argument will be zero.
4614 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
4615 * profiler event handler.
4617 * Returns: a non-zero value if the GC doesn't support heap walking
4620 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
4625 hwi.callback = callback;
4628 sgen_clear_nursery_fragments ();
4629 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE);
4631 major_collector.iterate_objects (TRUE, TRUE, walk_references, &hwi);
4632 sgen_los_iterate_objects (walk_references, &hwi);
4638 mono_gc_collect (int generation)
4643 sgen_perform_collection (0, generation, "user request", TRUE);
4648 mono_gc_max_generation (void)
4654 mono_gc_collection_count (int generation)
4656 if (generation == 0)
4657 return stat_minor_gcs;
4658 return stat_major_gcs;
4662 mono_gc_get_used_size (void)
4666 tot = los_memory_usage;
4667 tot += nursery_section->next_data - nursery_section->data;
4668 tot += major_collector.get_used_size ();
4669 /* FIXME: account for pinned objects */
4675 mono_gc_disable (void)
4683 mono_gc_enable (void)
4691 mono_gc_get_los_limit (void)
4693 return MAX_SMALL_OBJ_SIZE;
4697 mono_gc_user_markers_supported (void)
4703 mono_object_is_alive (MonoObject* o)
4709 mono_gc_get_generation (MonoObject *obj)
4711 if (ptr_in_nursery (obj))
4717 mono_gc_enable_events (void)
4722 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
4724 sgen_register_disappearing_link (obj, link_addr, track, FALSE);
4728 mono_gc_weak_link_remove (void **link_addr, gboolean track)
4730 sgen_register_disappearing_link (NULL, link_addr, track, FALSE);
4734 mono_gc_weak_link_get (void **link_addr)
4737 * We must only load *link_addr once because it might change
4738 * under our feet, and REVEAL_POINTER (NULL) results in an
4739 * invalid reference.
4741 void *ptr = *link_addr;
4746 * During the second bridge processing step the world is
4747 * running again. That step processes all weak links once
4748 * more to null those that refer to dead objects. Before that
4749 * is completed, those links must not be followed, so we
4750 * conservatively wait for bridge processing when any weak
4751 * link is dereferenced.
4753 if (G_UNLIKELY (bridge_processing_in_progress))
4754 mono_gc_wait_for_bridge_processing ();
4756 return (MonoObject*) REVEAL_POINTER (ptr);
4760 mono_gc_ephemeron_array_add (MonoObject *obj)
4762 EphemeronLinkNode *node;
4766 node = sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
4771 node->array = (char*)obj;
4772 node->next = ephemeron_list;
4773 ephemeron_list = node;
4775 SGEN_LOG (5, "Registered ephemeron array %p", obj);
4782 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
4786 result = func (data);
4787 UNLOCK_INTERRUPTION;
4792 mono_gc_is_gc_thread (void)
4796 result = mono_thread_info_current () != NULL;
4802 is_critical_method (MonoMethod *method)
4804 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
4808 mono_gc_base_init (void)
4810 MonoThreadInfoCallbacks cb;
4813 char *major_collector_opt = NULL;
4814 char *minor_collector_opt = NULL;
4816 glong soft_limit = 0;
4820 gboolean debug_print_allowance = FALSE;
4821 double allowance_ratio = 0, save_target = 0;
4822 gboolean have_split_nursery = FALSE;
4823 gboolean cement_enabled = TRUE;
4826 result = InterlockedCompareExchange (&gc_initialized, -1, 0);
4829 /* already inited */
4832 /* being inited by another thread */
4836 /* we will init it */
4839 g_assert_not_reached ();
4841 } while (result != 0);
4843 LOCK_INIT (gc_mutex);
4845 pagesize = mono_pagesize ();
4846 gc_debug_file = stderr;
4848 cb.thread_register = sgen_thread_register;
4849 cb.thread_unregister = sgen_thread_unregister;
4850 cb.thread_attach = sgen_thread_attach;
4851 cb.mono_method_is_critical = (gpointer)is_critical_method;
4853 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
4856 mono_threads_init (&cb, sizeof (SgenThreadInfo));
4858 LOCK_INIT (sgen_interruption_mutex);
4859 LOCK_INIT (pin_queue_mutex);
4861 init_user_copy_or_mark_key ();
4863 if ((env = getenv ("MONO_GC_PARAMS"))) {
4864 opts = g_strsplit (env, ",", -1);
4865 for (ptr = opts; *ptr; ++ptr) {
4867 if (g_str_has_prefix (opt, "major=")) {
4868 opt = strchr (opt, '=') + 1;
4869 major_collector_opt = g_strdup (opt);
4870 } else if (g_str_has_prefix (opt, "minor=")) {
4871 opt = strchr (opt, '=') + 1;
4872 minor_collector_opt = g_strdup (opt);
4880 sgen_init_internal_allocator ();
4881 sgen_init_nursery_allocator ();
4883 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_SECTION, SGEN_SIZEOF_GC_MEM_SECTION);
4884 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_FINALIZE_READY_ENTRY, sizeof (FinalizeReadyEntry));
4885 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_GRAY_QUEUE, sizeof (GrayQueueSection));
4886 g_assert (sizeof (GenericStoreRememberedSet) == sizeof (gpointer) * STORE_REMSET_BUFFER_SIZE);
4887 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_STORE_REMSET, sizeof (GenericStoreRememberedSet));
4888 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
4890 #ifndef HAVE_KW_THREAD
4891 mono_native_tls_alloc (&thread_info_key, NULL);
4895 * This needs to happen before any internal allocations because
4896 * it inits the small id which is required for hazard pointer
4901 mono_thread_info_attach (&dummy);
4903 if (!minor_collector_opt) {
4904 sgen_simple_nursery_init (&sgen_minor_collector);
4906 if (!strcmp (minor_collector_opt, "simple")) {
4907 sgen_simple_nursery_init (&sgen_minor_collector);
4908 } else if (!strcmp (minor_collector_opt, "split")) {
4909 sgen_split_nursery_init (&sgen_minor_collector);
4910 have_split_nursery = TRUE;
4912 fprintf (stderr, "Unknown minor collector `%s'.\n", minor_collector_opt);
4917 if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep")) {
4918 sgen_marksweep_init (&major_collector);
4919 } else if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep-fixed")) {
4920 sgen_marksweep_fixed_init (&major_collector);
4921 } else if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep-par")) {
4922 sgen_marksweep_par_init (&major_collector);
4923 } else if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep-fixed-par")) {
4924 sgen_marksweep_fixed_par_init (&major_collector);
4925 } else if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep-conc")) {
4926 sgen_marksweep_conc_init (&major_collector);
4928 fprintf (stderr, "Unknown major collector `%s'.\n", major_collector_opt);
4932 #ifdef SGEN_HAVE_CARDTABLE
4933 use_cardtable = major_collector.supports_cardtable;
4935 use_cardtable = FALSE;
4938 num_workers = mono_cpu_count ();
4939 g_assert (num_workers > 0);
4940 if (num_workers > 16)
4943 ///* Keep this the default for now */
4944 /* Precise marking is broken on all supported targets. Disable until fixed. */
4945 conservative_stack_mark = TRUE;
4947 sgen_nursery_size = DEFAULT_NURSERY_SIZE;
4950 for (ptr = opts; *ptr; ++ptr) {
4952 if (g_str_has_prefix (opt, "major="))
4954 if (g_str_has_prefix (opt, "minor="))
4956 if (g_str_has_prefix (opt, "wbarrier=")) {
4957 opt = strchr (opt, '=') + 1;
4958 if (strcmp (opt, "remset") == 0) {
4959 if (major_collector.is_concurrent) {
4960 fprintf (stderr, "The concurrent collector does not support the SSB write barrier.\n");
4963 use_cardtable = FALSE;
4964 } else if (strcmp (opt, "cardtable") == 0) {
4965 if (!use_cardtable) {
4966 if (major_collector.supports_cardtable)
4967 fprintf (stderr, "The cardtable write barrier is not supported on this platform.\n");
4969 fprintf (stderr, "The major collector does not support the cardtable write barrier.\n");
4973 fprintf (stderr, "wbarrier must either be `remset' or `cardtable'.");
4978 if (g_str_has_prefix (opt, "max-heap-size=")) {
4979 opt = strchr (opt, '=') + 1;
4980 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
4981 if ((max_heap & (mono_pagesize () - 1))) {
4982 fprintf (stderr, "max-heap-size size must be a multiple of %d.\n", mono_pagesize ());
4986 fprintf (stderr, "max-heap-size must be an integer.\n");
4991 if (g_str_has_prefix (opt, "soft-heap-limit=")) {
4992 opt = strchr (opt, '=') + 1;
4993 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &soft_limit)) {
4994 if (soft_limit <= 0) {
4995 fprintf (stderr, "soft-heap-limit must be positive.\n");
4999 fprintf (stderr, "soft-heap-limit must be an integer.\n");
5004 if (g_str_has_prefix (opt, "workers=")) {
5007 if (!major_collector.is_parallel) {
5008 fprintf (stderr, "The workers= option can only be used for parallel collectors.");
5011 opt = strchr (opt, '=') + 1;
5012 val = strtol (opt, &endptr, 10);
5013 if (!*opt || *endptr) {
5014 fprintf (stderr, "Cannot parse the workers= option value.");
5017 if (val <= 0 || val > 16) {
5018 fprintf (stderr, "The number of workers must be in the range 1 to 16.");
5021 num_workers = (int)val;
5024 if (g_str_has_prefix (opt, "stack-mark=")) {
5025 opt = strchr (opt, '=') + 1;
5026 if (!strcmp (opt, "precise")) {
5027 conservative_stack_mark = FALSE;
5028 } else if (!strcmp (opt, "conservative")) {
5029 conservative_stack_mark = TRUE;
5031 fprintf (stderr, "Invalid value '%s' for stack-mark= option, possible values are: 'precise', 'conservative'.\n", opt);
5036 if (g_str_has_prefix (opt, "bridge=")) {
5037 opt = strchr (opt, '=') + 1;
5038 sgen_register_test_bridge_callbacks (g_strdup (opt));
5042 if (g_str_has_prefix (opt, "nursery-size=")) {
5044 opt = strchr (opt, '=') + 1;
5045 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &val)) {
5046 sgen_nursery_size = val;
5047 #ifdef SGEN_ALIGN_NURSERY
5048 if ((val & (val - 1))) {
5049 fprintf (stderr, "The nursery size must be a power of two.\n");
5053 if (val < SGEN_MAX_NURSERY_WASTE) {
5054 fprintf (stderr, "The nursery size must be at least %d bytes.\n", SGEN_MAX_NURSERY_WASTE);
5058 sgen_nursery_bits = 0;
5059 while (1 << (++ sgen_nursery_bits) != sgen_nursery_size)
5063 fprintf (stderr, "nursery-size must be an integer.\n");
5069 if (g_str_has_prefix (opt, "save-target-ratio=")) {
5071 opt = strchr (opt, '=') + 1;
5072 save_target = strtod (opt, &endptr);
5073 if (endptr == opt) {
5074 fprintf (stderr, "save-target-ratio must be a number.");
5077 if (save_target < SGEN_MIN_SAVE_TARGET_RATIO || save_target > SGEN_MAX_SAVE_TARGET_RATIO) {
5078 fprintf (stderr, "save-target-ratio must be between %.2f - %.2f.", SGEN_MIN_SAVE_TARGET_RATIO, SGEN_MAX_SAVE_TARGET_RATIO);
5083 if (g_str_has_prefix (opt, "default-allowance-ratio=")) {
5085 opt = strchr (opt, '=') + 1;
5087 allowance_ratio = strtod (opt, &endptr);
5088 if (endptr == opt) {
5089 fprintf (stderr, "save-target-ratio must be a number.");
5092 if (allowance_ratio < SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO || allowance_ratio > SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO) {
5093 fprintf (stderr, "default-allowance-ratio must be between %.2f - %.2f.", SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO, SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO);
5099 if (!strcmp (opt, "cementing")) {
5100 cement_enabled = TRUE;
5103 if (!strcmp (opt, "no-cementing")) {
5104 cement_enabled = FALSE;
5108 if (major_collector.handle_gc_param && major_collector.handle_gc_param (opt))
5111 if (sgen_minor_collector.handle_gc_param && sgen_minor_collector.handle_gc_param (opt))
5114 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
5115 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
5116 fprintf (stderr, " soft-heap-limit=n (where N is an integer, possibly with a k, m or a g suffix)\n");
5117 fprintf (stderr, " nursery-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
5118 fprintf (stderr, " major=COLLECTOR (where COLLECTOR is `marksweep', `marksweep-par', 'marksweep-fixed' or 'marksweep-fixed-par')\n");
5119 fprintf (stderr, " minor=COLLECTOR (where COLLECTOR is `simple' or `split')\n");
5120 fprintf (stderr, " wbarrier=WBARRIER (where WBARRIER is `remset' or `cardtable')\n");
5121 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
5122 fprintf (stderr, " [no-]cementing\n");
5123 if (major_collector.print_gc_param_usage)
5124 major_collector.print_gc_param_usage ();
5125 if (sgen_minor_collector.print_gc_param_usage)
5126 sgen_minor_collector.print_gc_param_usage ();
5127 fprintf (stderr, " Experimental options:\n");
5128 fprintf (stderr, " save-target-ratio=R (where R must be between %.2f - %.2f).\n", SGEN_MIN_SAVE_TARGET_RATIO, SGEN_MAX_SAVE_TARGET_RATIO);
5129 fprintf (stderr, " default-allowance-ratio=R (where R must be between %.2f - %.2f).\n", SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO, SGEN_MAX_ALLOWANCE_NURSERY_SIZE_RATIO);
5135 if (major_collector.is_parallel)
5136 sgen_workers_init (num_workers);
5137 else if (major_collector.is_concurrent)
5138 sgen_workers_init (1);
5140 if (major_collector_opt)
5141 g_free (major_collector_opt);
5143 if (minor_collector_opt)
5144 g_free (minor_collector_opt);
5148 sgen_cement_init (cement_enabled);
5150 if ((env = getenv ("MONO_GC_DEBUG"))) {
5151 opts = g_strsplit (env, ",", -1);
5152 for (ptr = opts; ptr && *ptr; ptr ++) {
5154 if (opt [0] >= '0' && opt [0] <= '9') {
5155 gc_debug_level = atoi (opt);
5161 char *rf = g_strdup_printf ("%s.%d", opt, GetCurrentProcessId ());
5163 char *rf = g_strdup_printf ("%s.%d", opt, getpid ());
5165 gc_debug_file = fopen (rf, "wb");
5167 gc_debug_file = stderr;
5170 } else if (!strcmp (opt, "print-allowance")) {
5171 debug_print_allowance = TRUE;
5172 } else if (!strcmp (opt, "print-pinning")) {
5173 do_pin_stats = TRUE;
5174 } else if (!strcmp (opt, "verify-before-allocs")) {
5175 verify_before_allocs = 1;
5176 has_per_allocation_action = TRUE;
5177 } else if (g_str_has_prefix (opt, "verify-before-allocs=")) {
5178 char *arg = strchr (opt, '=') + 1;
5179 verify_before_allocs = atoi (arg);
5180 has_per_allocation_action = TRUE;
5181 } else if (!strcmp (opt, "collect-before-allocs")) {
5182 collect_before_allocs = 1;
5183 has_per_allocation_action = TRUE;
5184 } else if (g_str_has_prefix (opt, "collect-before-allocs=")) {
5185 char *arg = strchr (opt, '=') + 1;
5186 has_per_allocation_action = TRUE;
5187 collect_before_allocs = atoi (arg);
5188 } else if (!strcmp (opt, "verify-before-collections")) {
5189 whole_heap_check_before_collection = TRUE;
5190 } else if (!strcmp (opt, "check-at-minor-collections")) {
5191 consistency_check_at_minor_collection = TRUE;
5192 nursery_clear_policy = CLEAR_AT_GC;
5193 } else if (!strcmp (opt, "check-mark-bits")) {
5194 check_mark_bits_after_major_collection = TRUE;
5195 } else if (!strcmp (opt, "check-nursery-pinned")) {
5196 check_nursery_objects_pinned = TRUE;
5197 } else if (!strcmp (opt, "xdomain-checks")) {
5198 xdomain_checks = TRUE;
5199 } else if (!strcmp (opt, "clear-at-gc")) {
5200 nursery_clear_policy = CLEAR_AT_GC;
5201 } else if (!strcmp (opt, "clear-nursery-at-gc")) {
5202 nursery_clear_policy = CLEAR_AT_GC;
5203 } else if (!strcmp (opt, "check-scan-starts")) {
5204 do_scan_starts_check = TRUE;
5205 } else if (!strcmp (opt, "verify-nursery-at-minor-gc")) {
5206 do_verify_nursery = TRUE;
5207 } else if (!strcmp (opt, "check-concurrent")) {
5208 if (!major_collector.is_concurrent) {
5209 fprintf (stderr, "Error: check-concurrent only world with concurrent major collectors.\n");
5212 do_concurrent_checks = TRUE;
5213 } else if (!strcmp (opt, "dump-nursery-at-minor-gc")) {
5214 do_dump_nursery_content = TRUE;
5215 } else if (!strcmp (opt, "no-managed-allocator")) {
5216 sgen_set_use_managed_allocator (FALSE);
5217 } else if (!strcmp (opt, "disable-minor")) {
5218 disable_minor_collections = TRUE;
5219 } else if (!strcmp (opt, "disable-major")) {
5220 disable_major_collections = TRUE;
5221 } else if (g_str_has_prefix (opt, "heap-dump=")) {
5222 char *filename = strchr (opt, '=') + 1;
5223 nursery_clear_policy = CLEAR_AT_GC;
5224 heap_dump_file = fopen (filename, "w");
5225 if (heap_dump_file) {
5226 fprintf (heap_dump_file, "<sgen-dump>\n");
5227 do_pin_stats = TRUE;
5229 #ifdef SGEN_BINARY_PROTOCOL
5230 } else if (g_str_has_prefix (opt, "binary-protocol=")) {
5231 char *filename = strchr (opt, '=') + 1;
5232 binary_protocol_init (filename);
5234 fprintf (stderr, "Warning: Cardtable write barriers will not be binary-protocolled.\n");
5237 fprintf (stderr, "Invalid format for the MONO_GC_DEBUG env variable: '%s'\n", env);
5238 fprintf (stderr, "The format is: MONO_GC_DEBUG=[l[:filename]|<option>]+ where l is a debug level 0-9.\n");
5239 fprintf (stderr, "Valid options are:\n");
5240 fprintf (stderr, " collect-before-allocs[=<n>]\n");
5241 fprintf (stderr, " verify-before-allocs[=<n>]\n");
5242 fprintf (stderr, " check-at-minor-collections\n");
5243 fprintf (stderr, " check-mark-bits\n");
5244 fprintf (stderr, " check-nursery-pinned\n");
5245 fprintf (stderr, " verify-before-collections\n");
5246 fprintf (stderr, " verify-nursery-at-minor-gc\n");
5247 fprintf (stderr, " dump-nursery-at-minor-gc\n");
5248 fprintf (stderr, " disable-minor\n");
5249 fprintf (stderr, " disable-major\n");
5250 fprintf (stderr, " xdomain-checks\n");
5251 fprintf (stderr, " check-concurrent\n");
5252 fprintf (stderr, " clear-at-gc\n");
5253 fprintf (stderr, " clear-nursery-at-gc\n");
5254 fprintf (stderr, " check-scan-starts\n");
5255 fprintf (stderr, " no-managed-allocator\n");
5256 fprintf (stderr, " print-allowance\n");
5257 fprintf (stderr, " print-pinning\n");
5258 fprintf (stderr, " heap-dump=<filename>\n");
5259 #ifdef SGEN_BINARY_PROTOCOL
5260 fprintf (stderr, " binary-protocol=<filename>\n");
5268 if (major_collector.is_parallel) {
5269 if (heap_dump_file) {
5270 fprintf (stderr, "Error: Cannot do heap dump with the parallel collector.\n");
5274 fprintf (stderr, "Error: Cannot gather pinning statistics with the parallel collector.\n");
5279 if (major_collector.post_param_init)
5280 major_collector.post_param_init (&major_collector);
5282 sgen_memgov_init (max_heap, soft_limit, debug_print_allowance, allowance_ratio, save_target);
5284 memset (&remset, 0, sizeof (remset));
5286 #ifdef SGEN_HAVE_CARDTABLE
5288 sgen_card_table_init (&remset);
5291 sgen_ssb_init (&remset);
5293 if (remset.register_thread)
5294 remset.register_thread (mono_thread_info_current ());
5300 mono_gc_get_gc_name (void)
5305 static MonoMethod *write_barrier_method;
5308 sgen_is_critical_method (MonoMethod *method)
5310 return (method == write_barrier_method || sgen_is_managed_allocator (method));
5314 sgen_has_critical_method (void)
5316 return write_barrier_method || sgen_has_managed_allocator ();
5320 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels)
5322 memset (nursery_check_return_labels, 0, sizeof (int) * 3);
5323 #ifdef SGEN_ALIGN_NURSERY
5324 // if (ptr_in_nursery (ptr)) return;
5326 * Masking out the bits might be faster, but we would have to use 64 bit
5327 * immediates, which might be slower.
5329 mono_mb_emit_ldarg (mb, 0);
5330 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
5331 mono_mb_emit_byte (mb, CEE_SHR_UN);
5332 mono_mb_emit_icon (mb, (mword)sgen_get_nursery_start () >> DEFAULT_NURSERY_BITS);
5333 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
5335 if (!major_collector.is_concurrent) {
5336 // if (!ptr_in_nursery (*ptr)) return;
5337 mono_mb_emit_ldarg (mb, 0);
5338 mono_mb_emit_byte (mb, CEE_LDIND_I);
5339 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
5340 mono_mb_emit_byte (mb, CEE_SHR_UN);
5341 mono_mb_emit_icon (mb, (mword)sgen_get_nursery_start () >> DEFAULT_NURSERY_BITS);
5342 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
5345 int label_continue1, label_continue2;
5346 int dereferenced_var;
5348 // if (ptr < (sgen_get_nursery_start ())) goto continue;
5349 mono_mb_emit_ldarg (mb, 0);
5350 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_start ());
5351 label_continue_1 = mono_mb_emit_branch (mb, CEE_BLT);
5353 // if (ptr >= sgen_get_nursery_end ())) goto continue;
5354 mono_mb_emit_ldarg (mb, 0);
5355 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_end ());
5356 label_continue_2 = mono_mb_emit_branch (mb, CEE_BGE);
5359 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BR);
5362 mono_mb_patch_branch (mb, label_continue_1);
5363 mono_mb_patch_branch (mb, label_continue_2);
5365 // Dereference and store in local var
5366 dereferenced_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
5367 mono_mb_emit_ldarg (mb, 0);
5368 mono_mb_emit_byte (mb, CEE_LDIND_I);
5369 mono_mb_emit_stloc (mb, dereferenced_var);
5371 if (!major_collector.is_concurrent) {
5372 // if (*ptr < sgen_get_nursery_start ()) return;
5373 mono_mb_emit_ldloc (mb, dereferenced_var);
5374 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_start ());
5375 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BLT);
5377 // if (*ptr >= sgen_get_nursery_end ()) return;
5378 mono_mb_emit_ldloc (mb, dereferenced_var);
5379 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_end ());
5380 nursery_check_return_labels [2] = mono_mb_emit_branch (mb, CEE_BGE);
5386 mono_gc_get_write_barrier (void)
5389 MonoMethodBuilder *mb;
5390 MonoMethodSignature *sig;
5391 #ifdef MANAGED_WBARRIER
5392 int i, nursery_check_labels [3];
5393 int label_no_wb_3, label_no_wb_4, label_need_wb, label_slow_path;
5394 int buffer_var, buffer_index_var, dummy_var;
5396 #ifdef HAVE_KW_THREAD
5397 int stack_end_offset = -1, store_remset_buffer_offset = -1;
5398 int store_remset_buffer_index_offset = -1, store_remset_buffer_index_addr_offset = -1;
5400 MONO_THREAD_VAR_OFFSET (stack_end, stack_end_offset);
5401 g_assert (stack_end_offset != -1);
5402 MONO_THREAD_VAR_OFFSET (store_remset_buffer, store_remset_buffer_offset);
5403 g_assert (store_remset_buffer_offset != -1);
5404 MONO_THREAD_VAR_OFFSET (store_remset_buffer_index, store_remset_buffer_index_offset);
5405 g_assert (store_remset_buffer_index_offset != -1);
5406 MONO_THREAD_VAR_OFFSET (store_remset_buffer_index_addr, store_remset_buffer_index_addr_offset);
5407 g_assert (store_remset_buffer_index_addr_offset != -1);
5411 // FIXME: Maybe create a separate version for ctors (the branch would be
5412 // correctly predicted more times)
5413 if (write_barrier_method)
5414 return write_barrier_method;
5416 /* Create the IL version of mono_gc_barrier_generic_store () */
5417 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
5418 sig->ret = &mono_defaults.void_class->byval_arg;
5419 sig->params [0] = &mono_defaults.int_class->byval_arg;
5421 mb = mono_mb_new (mono_defaults.object_class, "wbarrier", MONO_WRAPPER_WRITE_BARRIER);
5423 #ifdef MANAGED_WBARRIER
5424 if (use_cardtable) {
5425 emit_nursery_check (mb, nursery_check_labels);
5427 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
5431 LDC_PTR sgen_cardtable
5433 address >> CARD_BITS
5437 if (SGEN_HAVE_OVERLAPPING_CARDS) {
5438 LDC_PTR card_table_mask
5445 mono_mb_emit_ptr (mb, sgen_cardtable);
5446 mono_mb_emit_ldarg (mb, 0);
5447 mono_mb_emit_icon (mb, CARD_BITS);
5448 mono_mb_emit_byte (mb, CEE_SHR_UN);
5449 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
5450 mono_mb_emit_ptr (mb, (gpointer)CARD_MASK);
5451 mono_mb_emit_byte (mb, CEE_AND);
5453 mono_mb_emit_byte (mb, CEE_ADD);
5454 mono_mb_emit_icon (mb, 1);
5455 mono_mb_emit_byte (mb, CEE_STIND_I1);
5458 for (i = 0; i < 3; ++i) {
5459 if (nursery_check_labels [i])
5460 mono_mb_patch_branch (mb, nursery_check_labels [i]);
5462 mono_mb_emit_byte (mb, CEE_RET);
5463 } else if (mono_runtime_has_tls_get ()) {
5464 emit_nursery_check (mb, nursery_check_labels);
5466 // if (ptr >= stack_end) goto need_wb;
5467 mono_mb_emit_ldarg (mb, 0);
5468 EMIT_TLS_ACCESS (mb, stack_end, stack_end_offset);
5469 label_need_wb = mono_mb_emit_branch (mb, CEE_BGE_UN);
5471 // if (ptr >= stack_start) return;
5472 dummy_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
5473 mono_mb_emit_ldarg (mb, 0);
5474 mono_mb_emit_ldloc_addr (mb, dummy_var);
5475 label_no_wb_3 = mono_mb_emit_branch (mb, CEE_BGE_UN);
5478 mono_mb_patch_branch (mb, label_need_wb);
5480 // buffer = STORE_REMSET_BUFFER;
5481 buffer_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
5482 EMIT_TLS_ACCESS (mb, store_remset_buffer, store_remset_buffer_offset);
5483 mono_mb_emit_stloc (mb, buffer_var);
5485 // buffer_index = STORE_REMSET_BUFFER_INDEX;
5486 buffer_index_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
5487 EMIT_TLS_ACCESS (mb, store_remset_buffer_index, store_remset_buffer_index_offset);
5488 mono_mb_emit_stloc (mb, buffer_index_var);
5490 // if (buffer [buffer_index] == ptr) return;
5491 mono_mb_emit_ldloc (mb, buffer_var);
5492 mono_mb_emit_ldloc (mb, buffer_index_var);
5493 g_assert (sizeof (gpointer) == 4 || sizeof (gpointer) == 8);
5494 mono_mb_emit_icon (mb, sizeof (gpointer) == 4 ? 2 : 3);
5495 mono_mb_emit_byte (mb, CEE_SHL);
5496 mono_mb_emit_byte (mb, CEE_ADD);
5497 mono_mb_emit_byte (mb, CEE_LDIND_I);
5498 mono_mb_emit_ldarg (mb, 0);
5499 label_no_wb_4 = mono_mb_emit_branch (mb, CEE_BEQ);
5502 mono_mb_emit_ldloc (mb, buffer_index_var);
5503 mono_mb_emit_icon (mb, 1);
5504 mono_mb_emit_byte (mb, CEE_ADD);
5505 mono_mb_emit_stloc (mb, buffer_index_var);
5507 // if (buffer_index >= STORE_REMSET_BUFFER_SIZE) goto slow_path;
5508 mono_mb_emit_ldloc (mb, buffer_index_var);
5509 mono_mb_emit_icon (mb, STORE_REMSET_BUFFER_SIZE);
5510 label_slow_path = mono_mb_emit_branch (mb, CEE_BGE);
5512 // buffer [buffer_index] = ptr;
5513 mono_mb_emit_ldloc (mb, buffer_var);
5514 mono_mb_emit_ldloc (mb, buffer_index_var);
5515 g_assert (sizeof (gpointer) == 4 || sizeof (gpointer) == 8);
5516 mono_mb_emit_icon (mb, sizeof (gpointer) == 4 ? 2 : 3);
5517 mono_mb_emit_byte (mb, CEE_SHL);
5518 mono_mb_emit_byte (mb, CEE_ADD);
5519 mono_mb_emit_ldarg (mb, 0);
5520 mono_mb_emit_byte (mb, CEE_STIND_I);
5522 // STORE_REMSET_BUFFER_INDEX = buffer_index;
5523 EMIT_TLS_ACCESS (mb, store_remset_buffer_index_addr, store_remset_buffer_index_addr_offset);
5524 mono_mb_emit_ldloc (mb, buffer_index_var);
5525 mono_mb_emit_byte (mb, CEE_STIND_I);
5528 for (i = 0; i < 3; ++i) {
5529 if (nursery_check_labels [i])
5530 mono_mb_patch_branch (mb, nursery_check_labels [i]);
5532 mono_mb_patch_branch (mb, label_no_wb_3);
5533 mono_mb_patch_branch (mb, label_no_wb_4);
5534 mono_mb_emit_byte (mb, CEE_RET);
5537 mono_mb_patch_branch (mb, label_slow_path);
5539 mono_mb_emit_ldarg (mb, 0);
5540 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
5541 mono_mb_emit_byte (mb, CEE_RET);
5545 mono_mb_emit_ldarg (mb, 0);
5546 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
5547 mono_mb_emit_byte (mb, CEE_RET);
5550 res = mono_mb_create_method (mb, sig, 16);
5553 mono_loader_lock ();
5554 if (write_barrier_method) {
5555 /* Already created */
5556 mono_free_method (res);
5558 /* double-checked locking */
5559 mono_memory_barrier ();
5560 write_barrier_method = res;
5562 mono_loader_unlock ();
5564 return write_barrier_method;
5568 mono_gc_get_description (void)
5570 return g_strdup ("sgen");
5574 mono_gc_set_desktop_mode (void)
5579 mono_gc_is_moving (void)
5585 mono_gc_is_disabled (void)
5591 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
5598 sgen_get_nursery_clear_policy (void)
5600 return nursery_clear_policy;
5604 sgen_get_array_fill_vtable (void)
5606 if (!array_fill_vtable) {
5607 static MonoClass klass;
5608 static MonoVTable vtable;
5611 MonoDomain *domain = mono_get_root_domain ();
5614 klass.element_class = mono_defaults.byte_class;
5616 klass.instance_size = sizeof (MonoArray);
5617 klass.sizes.element_size = 1;
5618 klass.name = "array_filler_type";
5620 vtable.klass = &klass;
5622 vtable.gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
5625 array_fill_vtable = &vtable;
5627 return array_fill_vtable;
5637 sgen_gc_unlock (void)
5643 sgen_major_collector_iterate_live_block_ranges (sgen_cardtable_block_callback callback)
5645 major_collector.iterate_live_block_ranges (callback);
5649 sgen_major_collector_scan_card_table (SgenGrayQueue *queue)
5651 major_collector.scan_card_table (FALSE, queue);
5655 sgen_get_major_collector (void)
5657 return &major_collector;
5660 void mono_gc_set_skip_thread (gboolean skip)
5662 SgenThreadInfo *info = mono_thread_info_current ();
5665 info->gc_disabled = skip;
5670 sgen_get_remset (void)
5676 mono_gc_get_vtable_bits (MonoClass *class)
5678 if (sgen_need_bridge_processing () && sgen_is_bridge_class (class))
5679 return SGEN_GC_BIT_BRIDGE_OBJECT;
5684 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
5691 sgen_check_whole_heap_stw (void)
5693 sgen_stop_world (0);
5694 sgen_clear_nursery_fragments ();
5695 sgen_check_whole_heap (FALSE);
5696 sgen_restart_world (0, NULL);
5700 sgen_gc_event_moves (void)
5702 if (moved_objects_idx) {
5703 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
5704 moved_objects_idx = 0;
5708 #endif /* HAVE_SGEN_GC */