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.
17 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
18 * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
20 * Permission is hereby granted to use or copy this program
21 * for any purpose, provided the above notices are retained on all copies.
22 * Permission to modify the code and to distribute modified code is granted,
23 * provided the above notices are retained, and a notice that the code was
24 * modified is included with the above copyright notice.
27 * Copyright 2001-2003 Ximian, Inc
28 * Copyright 2003-2010 Novell, Inc.
29 * Copyright 2011 Xamarin, Inc.
31 * Permission is hereby granted, free of charge, to any person obtaining
32 * a copy of this software and associated documentation files (the
33 * "Software"), to deal in the Software without restriction, including
34 * without limitation the rights to use, copy, modify, merge, publish,
35 * distribute, sublicense, and/or sell copies of the Software, and to
36 * permit persons to whom the Software is furnished to do so, subject to
37 * the following conditions:
39 * The above copyright notice and this permission notice shall be
40 * included in all copies or substantial portions of the Software.
42 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
43 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
44 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
45 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
46 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
47 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
48 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
51 * Important: allocation provides always zeroed memory, having to do
52 * a memset after allocation is deadly for performance.
53 * Memory usage at startup is currently as follows:
55 * 64 KB internal space
57 * We should provide a small memory config with half the sizes
59 * We currently try to make as few mono assumptions as possible:
60 * 1) 2-word header with no GC pointers in it (first vtable, second to store the
62 * 2) gc descriptor is the second word in the vtable (first word in the class)
63 * 3) 8 byte alignment is the minimum and enough (not true for special structures (SIMD), FIXME)
64 * 4) there is a function to get an object's size and the number of
65 * elements in an array.
66 * 5) we know the special way bounds are allocated for complex arrays
67 * 6) we know about proxies and how to treat them when domains are unloaded
69 * Always try to keep stack usage to a minimum: no recursive behaviour
70 * and no large stack allocs.
72 * General description.
73 * Objects are initially allocated in a nursery using a fast bump-pointer technique.
74 * When the nursery is full we start a nursery collection: this is performed with a
76 * When the old generation is full we start a copying GC of the old generation as well:
77 * this will be changed to mark&sweep with copying when fragmentation becomes to severe
78 * in the future. Maybe we'll even do both during the same collection like IMMIX.
80 * The things that complicate this description are:
81 * *) pinned objects: we can't move them so we need to keep track of them
82 * *) no precise info of the thread stacks and registers: we need to be able to
83 * quickly find the objects that may be referenced conservatively and pin them
84 * (this makes the first issues more important)
85 * *) large objects are too expensive to be dealt with using copying GC: we handle them
86 * with mark/sweep during major collections
87 * *) some objects need to not move even if they are small (interned strings, Type handles):
88 * we use mark/sweep for them, too: they are not allocated in the nursery, but inside
89 * PinnedChunks regions
95 *) we could have a function pointer in MonoClass to implement
96 customized write barriers for value types
98 *) investigate the stuff needed to advance a thread to a GC-safe
99 point (single-stepping, read from unmapped memory etc) and implement it.
100 This would enable us to inline allocations and write barriers, for example,
101 or at least parts of them, like the write barrier checks.
102 We may need this also for handling precise info on stacks, even simple things
103 as having uninitialized data on the stack and having to wait for the prolog
104 to zero it. Not an issue for the last frame that we scan conservatively.
105 We could always not trust the value in the slots anyway.
107 *) modify the jit to save info about references in stack locations:
108 this can be done just for locals as a start, so that at least
109 part of the stack is handled precisely.
111 *) test/fix endianess issues
113 *) Implement a card table as the write barrier instead of remembered
114 sets? Card tables are not easy to implement with our current
115 memory layout. We have several different kinds of major heap
116 objects: Small objects in regular blocks, small objects in pinned
117 chunks and LOS objects. If we just have a pointer we have no way
118 to tell which kind of object it points into, therefore we cannot
119 know where its card table is. The least we have to do to make
120 this happen is to get rid of write barriers for indirect stores.
123 *) Get rid of write barriers for indirect stores. We can do this by
124 telling the GC to wbarrier-register an object once we do an ldloca
125 or ldelema on it, and to unregister it once it's not used anymore
126 (it can only travel downwards on the stack). The problem with
127 unregistering is that it needs to happen eventually no matter
128 what, even if exceptions are thrown, the thread aborts, etc.
129 Rodrigo suggested that we could do only the registering part and
130 let the collector find out (pessimistically) when it's safe to
131 unregister, namely when the stack pointer of the thread that
132 registered the object is higher than it was when the registering
133 happened. This might make for a good first implementation to get
134 some data on performance.
136 *) Some sort of blacklist support? Blacklists is a concept from the
137 Boehm GC: if during a conservative scan we find pointers to an
138 area which we might use as heap, we mark that area as unusable, so
139 pointer retention by random pinning pointers is reduced.
141 *) experiment with max small object size (very small right now - 2kb,
142 because it's tied to the max freelist size)
144 *) add an option to mmap the whole heap in one chunk: it makes for many
145 simplifications in the checks (put the nursery at the top and just use a single
146 check for inclusion/exclusion): the issue this has is that on 32 bit systems it's
147 not flexible (too much of the address space may be used by default or we can't
148 increase the heap as needed) and we'd need a race-free mechanism to return memory
149 back to the system (mprotect(PROT_NONE) will still keep the memory allocated if it
150 was written to, munmap is needed, but the following mmap may not find the same segment
153 *) memzero the major fragments after restarting the world and optionally a smaller
156 *) investigate having fragment zeroing threads
158 *) separate locks for finalization and other minor stuff to reduce
161 *) try a different copying order to improve memory locality
163 *) a thread abort after a store but before the write barrier will
164 prevent the write barrier from executing
166 *) specialized dynamically generated markers/copiers
168 *) Dynamically adjust TLAB size to the number of threads. If we have
169 too many threads that do allocation, we might need smaller TLABs,
170 and we might get better performance with larger TLABs if we only
171 have a handful of threads. We could sum up the space left in all
172 assigned TLABs and if that's more than some percentage of the
173 nursery size, reduce the TLAB size.
175 *) Explore placing unreachable objects on unused nursery memory.
176 Instead of memset'ng a region to zero, place an int[] covering it.
177 A good place to start is add_nursery_frag. The tricky thing here is
178 placing those objects atomically outside of a collection.
180 *) Allocation should use asymmetric Dekker synchronization:
181 http://blogs.oracle.com/dave/resource/Asymmetric-Dekker-Synchronization.txt
182 This should help weak consistency archs.
189 #define _XOPEN_SOURCE
190 #define _DARWIN_C_SOURCE
196 #ifdef HAVE_PTHREAD_H
199 #ifdef HAVE_SEMAPHORE_H
200 #include <semaphore.h>
208 #include "metadata/sgen-gc.h"
209 #include "metadata/metadata-internals.h"
210 #include "metadata/class-internals.h"
211 #include "metadata/gc-internal.h"
212 #include "metadata/object-internals.h"
213 #include "metadata/threads.h"
214 #include "metadata/sgen-cardtable.h"
215 #include "metadata/sgen-ssb.h"
216 #include "metadata/sgen-protocol.h"
217 #include "metadata/sgen-archdep.h"
218 #include "metadata/sgen-bridge.h"
219 #include "metadata/sgen-memory-governor.h"
220 #include "metadata/sgen-hash-table.h"
221 #include "metadata/mono-gc.h"
222 #include "metadata/method-builder.h"
223 #include "metadata/profiler-private.h"
224 #include "metadata/monitor.h"
225 #include "metadata/threadpool-internals.h"
226 #include "metadata/mempool-internals.h"
227 #include "metadata/marshal.h"
228 #include "metadata/runtime.h"
229 #include "metadata/sgen-cardtable.h"
230 #include "metadata/sgen-pinning.h"
231 #include "metadata/sgen-workers.h"
232 #include "utils/mono-mmap.h"
233 #include "utils/mono-time.h"
234 #include "utils/mono-semaphore.h"
235 #include "utils/mono-counters.h"
236 #include "utils/mono-proclib.h"
237 #include "utils/mono-memory-model.h"
238 #include "utils/mono-logger-internal.h"
239 #include "utils/dtrace.h"
241 #include <mono/utils/mono-logger-internal.h>
242 #include <mono/utils/memcheck.h>
244 #if defined(__MACH__)
245 #include "utils/mach-support.h"
248 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
252 #include "mono/cil/opcode.def"
258 #undef pthread_create
260 #undef pthread_detach
263 * ######################################################################
264 * ######## Types and constants used by the GC.
265 * ######################################################################
268 /* 0 means not initialized, 1 is initialized, -1 means in progress */
269 static int gc_initialized = 0;
270 /* If set, check if we need to do something every X allocations */
271 gboolean has_per_allocation_action;
272 /* If set, do a heap check every X allocation */
273 guint32 verify_before_allocs = 0;
274 /* If set, do a minor collection before every X allocation */
275 guint32 collect_before_allocs = 0;
276 /* If set, do a whole heap check before each collection */
277 static gboolean whole_heap_check_before_collection = FALSE;
278 /* If set, do a heap consistency check before each minor collection */
279 static gboolean consistency_check_at_minor_collection = FALSE;
280 /* If set, check that there are no references to the domain left at domain unload */
281 static gboolean xdomain_checks = FALSE;
282 /* If not null, dump the heap after each collection into this file */
283 static FILE *heap_dump_file = NULL;
284 /* If set, mark stacks conservatively, even if precise marking is possible */
285 static gboolean conservative_stack_mark = FALSE;
286 /* If set, do a plausibility check on the scan_starts before and after
288 static gboolean do_scan_starts_check = FALSE;
289 static gboolean nursery_collection_is_parallel = FALSE;
290 static gboolean disable_minor_collections = FALSE;
291 static gboolean disable_major_collections = FALSE;
292 gboolean do_pin_stats = FALSE;
293 static gboolean do_verify_nursery = FALSE;
294 static gboolean do_dump_nursery_content = FALSE;
296 #ifdef HEAVY_STATISTICS
297 long long stat_objects_alloced_degraded = 0;
298 long long stat_bytes_alloced_degraded = 0;
300 long long stat_copy_object_called_nursery = 0;
301 long long stat_objects_copied_nursery = 0;
302 long long stat_copy_object_called_major = 0;
303 long long stat_objects_copied_major = 0;
305 long long stat_scan_object_called_nursery = 0;
306 long long stat_scan_object_called_major = 0;
308 long long stat_slots_allocated_in_vain;
310 long long stat_nursery_copy_object_failed_from_space = 0;
311 long long stat_nursery_copy_object_failed_forwarded = 0;
312 long long stat_nursery_copy_object_failed_pinned = 0;
313 long long stat_nursery_copy_object_failed_to_space = 0;
315 static int stat_wbarrier_set_field = 0;
316 static int stat_wbarrier_set_arrayref = 0;
317 static int stat_wbarrier_arrayref_copy = 0;
318 static int stat_wbarrier_generic_store = 0;
319 static int stat_wbarrier_set_root = 0;
320 static int stat_wbarrier_value_copy = 0;
321 static int stat_wbarrier_object_copy = 0;
324 int stat_minor_gcs = 0;
325 int stat_major_gcs = 0;
327 static long long stat_pinned_objects = 0;
329 static long long time_minor_pre_collection_fragment_clear = 0;
330 static long long time_minor_pinning = 0;
331 static long long time_minor_scan_remsets = 0;
332 static long long time_minor_scan_pinned = 0;
333 static long long time_minor_scan_registered_roots = 0;
334 static long long time_minor_scan_thread_data = 0;
335 static long long time_minor_finish_gray_stack = 0;
336 static long long time_minor_fragment_creation = 0;
338 static long long time_major_pre_collection_fragment_clear = 0;
339 static long long time_major_pinning = 0;
340 static long long time_major_scan_pinned = 0;
341 static long long time_major_scan_registered_roots = 0;
342 static long long time_major_scan_thread_data = 0;
343 static long long time_major_scan_alloc_pinned = 0;
344 static long long time_major_scan_finalized = 0;
345 static long long time_major_scan_big_objects = 0;
346 static long long time_major_finish_gray_stack = 0;
347 static long long time_major_free_bigobjs = 0;
348 static long long time_major_los_sweep = 0;
349 static long long time_major_sweep = 0;
350 static long long time_major_fragment_creation = 0;
352 int gc_debug_level = 0;
357 mono_gc_flush_info (void)
359 fflush (gc_debug_file);
363 #define TV_DECLARE SGEN_TV_DECLARE
364 #define TV_GETTIME SGEN_TV_GETTIME
365 #define TV_ELAPSED SGEN_TV_ELAPSED
366 #define TV_ELAPSED_MS SGEN_TV_ELAPSED_MS
368 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
370 NurseryClearPolicy nursery_clear_policy = CLEAR_AT_TLAB_CREATION;
372 #define object_is_forwarded SGEN_OBJECT_IS_FORWARDED
373 #define object_is_pinned SGEN_OBJECT_IS_PINNED
374 #define pin_object SGEN_PIN_OBJECT
375 #define unpin_object SGEN_UNPIN_OBJECT
377 #define ptr_in_nursery sgen_ptr_in_nursery
379 #define LOAD_VTABLE SGEN_LOAD_VTABLE
382 safe_name (void* obj)
384 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (obj);
385 return vt->klass->name;
388 #define safe_object_get_size sgen_safe_object_get_size
391 sgen_safe_name (void* obj)
393 return safe_name (obj);
397 * ######################################################################
398 * ######## Global data.
399 * ######################################################################
401 LOCK_DECLARE (gc_mutex);
402 static int gc_disabled = 0;
404 static gboolean use_cardtable;
406 #define SCAN_START_SIZE SGEN_SCAN_START_SIZE
408 static mword pagesize = 4096;
409 int degraded_mode = 0;
411 static mword bytes_pinned_from_failed_allocation = 0;
413 GCMemSection *nursery_section = NULL;
414 static mword lowest_heap_address = ~(mword)0;
415 static mword highest_heap_address = 0;
417 LOCK_DECLARE (sgen_interruption_mutex);
418 static LOCK_DECLARE (pin_queue_mutex);
420 #define LOCK_PIN_QUEUE mono_mutex_lock (&pin_queue_mutex)
421 #define UNLOCK_PIN_QUEUE mono_mutex_unlock (&pin_queue_mutex)
423 typedef struct _FinalizeReadyEntry FinalizeReadyEntry;
424 struct _FinalizeReadyEntry {
425 FinalizeReadyEntry *next;
429 typedef struct _EphemeronLinkNode EphemeronLinkNode;
431 struct _EphemeronLinkNode {
432 EphemeronLinkNode *next;
441 int current_collection_generation = -1;
443 /* objects that are ready to be finalized */
444 static FinalizeReadyEntry *fin_ready_list = NULL;
445 static FinalizeReadyEntry *critical_fin_list = NULL;
447 static EphemeronLinkNode *ephemeron_list;
449 /* registered roots: the key to the hash is the root start address */
451 * Different kinds of roots are kept separate to speed up pin_from_roots () for example.
453 SgenHashTable roots_hash [ROOT_TYPE_NUM] = {
454 SGEN_HASH_TABLE_INIT (INTERNAL_MEM_ROOTS_TABLE, INTERNAL_MEM_ROOT_RECORD, sizeof (RootRecord), mono_aligned_addr_hash, NULL),
455 SGEN_HASH_TABLE_INIT (INTERNAL_MEM_ROOTS_TABLE, INTERNAL_MEM_ROOT_RECORD, sizeof (RootRecord), mono_aligned_addr_hash, NULL),
456 SGEN_HASH_TABLE_INIT (INTERNAL_MEM_ROOTS_TABLE, INTERNAL_MEM_ROOT_RECORD, sizeof (RootRecord), mono_aligned_addr_hash, NULL)
458 static mword roots_size = 0; /* amount of memory in the root set */
460 #define GC_ROOT_NUM 32
463 void *objects [GC_ROOT_NUM];
464 int root_types [GC_ROOT_NUM];
465 uintptr_t extra_info [GC_ROOT_NUM];
469 notify_gc_roots (GCRootReport *report)
473 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
478 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
480 if (report->count == GC_ROOT_NUM)
481 notify_gc_roots (report);
482 report->objects [report->count] = object;
483 report->root_types [report->count] = rtype;
484 report->extra_info [report->count++] = (uintptr_t)((MonoVTable*)LOAD_VTABLE (object))->klass;
487 MonoNativeTlsKey thread_info_key;
489 #ifdef HAVE_KW_THREAD
490 __thread SgenThreadInfo *sgen_thread_info;
491 __thread gpointer *store_remset_buffer;
492 __thread long store_remset_buffer_index;
493 __thread char *stack_end;
494 __thread long *store_remset_buffer_index_addr;
497 /* The size of a TLAB */
498 /* The bigger the value, the less often we have to go to the slow path to allocate a new
499 * one, but the more space is wasted by threads not allocating much memory.
501 * FIXME: Make this self-tuning for each thread.
503 guint32 tlab_size = (1024 * 4);
505 #define MAX_SMALL_OBJ_SIZE SGEN_MAX_SMALL_OBJ_SIZE
507 /* Functions supplied by the runtime to be called by the GC */
508 static MonoGCCallbacks gc_callbacks;
510 #define ALLOC_ALIGN SGEN_ALLOC_ALIGN
511 #define ALLOC_ALIGN_BITS SGEN_ALLOC_ALIGN_BITS
513 #define ALIGN_UP SGEN_ALIGN_UP
515 #define MOVED_OBJECTS_NUM 64
516 static void *moved_objects [MOVED_OBJECTS_NUM];
517 static int moved_objects_idx = 0;
519 /* Vtable of the objects used to fill out nursery fragments before a collection */
520 static MonoVTable *array_fill_vtable;
522 #ifdef SGEN_DEBUG_INTERNAL_ALLOC
523 MonoNativeThreadId main_gc_thread = NULL;
526 /*Object was pinned during the current collection*/
527 static mword objects_pinned;
530 * ######################################################################
531 * ######## Macros and function declarations.
532 * ######################################################################
536 align_pointer (void *ptr)
538 mword p = (mword)ptr;
539 p += sizeof (gpointer) - 1;
540 p &= ~ (sizeof (gpointer) - 1);
544 typedef SgenGrayQueue GrayQueue;
546 /* forward declarations */
547 static void scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, GrayQueue *queue);
548 static void scan_from_registered_roots (CopyOrMarkObjectFunc copy_func, char *addr_start, char *addr_end, int root_type, GrayQueue *queue);
549 static void scan_finalizer_entries (CopyOrMarkObjectFunc copy_func, FinalizeReadyEntry *list, GrayQueue *queue);
550 static void report_finalizer_roots (void);
551 static void report_registered_roots (void);
553 static void pin_from_roots (void *start_nursery, void *end_nursery, GrayQueue *queue);
554 static int pin_objects_from_addresses (GCMemSection *section, void **start, void **end, void *start_nursery, void *end_nursery, GrayQueue *queue);
555 static void finish_gray_stack (char *start_addr, char *end_addr, int generation, GrayQueue *queue);
557 void mono_gc_scan_for_specific_ref (MonoObject *key, gboolean precise);
560 static void init_stats (void);
562 static int mark_ephemerons_in_range (CopyOrMarkObjectFunc copy_func, char *start, char *end, GrayQueue *queue);
563 static void clear_unreachable_ephemerons (CopyOrMarkObjectFunc copy_func, char *start, char *end, GrayQueue *queue);
564 static void null_ephemerons_for_domain (MonoDomain *domain);
566 SgenObjectOperations current_object_ops;
567 SgenMajorCollector major_collector;
568 SgenMinorCollector sgen_minor_collector;
569 static GrayQueue gray_queue;
571 static SgenRemeberedSet remset;
574 #define WORKERS_DISTRIBUTE_GRAY_QUEUE (sgen_collection_is_parallel () ? sgen_workers_get_distribute_gray_queue () : &gray_queue)
576 static SgenGrayQueue*
577 sgen_workers_get_job_gray_queue (WorkerData *worker_data)
579 return worker_data ? &worker_data->private_gray_queue : WORKERS_DISTRIBUTE_GRAY_QUEUE;
583 is_xdomain_ref_allowed (gpointer *ptr, char *obj, MonoDomain *domain)
585 MonoObject *o = (MonoObject*)(obj);
586 MonoObject *ref = (MonoObject*)*(ptr);
587 int offset = (char*)(ptr) - (char*)o;
589 if (o->vtable->klass == mono_defaults.thread_class && offset == G_STRUCT_OFFSET (MonoThread, internal_thread))
591 if (o->vtable->klass == mono_defaults.internal_thread_class && offset == G_STRUCT_OFFSET (MonoInternalThread, current_appcontext))
593 if (mono_class_has_parent_fast (o->vtable->klass, mono_defaults.real_proxy_class) &&
594 offset == G_STRUCT_OFFSET (MonoRealProxy, unwrapped_server))
596 /* Thread.cached_culture_info */
597 if (!strcmp (ref->vtable->klass->name_space, "System.Globalization") &&
598 !strcmp (ref->vtable->klass->name, "CultureInfo") &&
599 !strcmp(o->vtable->klass->name_space, "System") &&
600 !strcmp(o->vtable->klass->name, "Object[]"))
603 * 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
604 * at System.IO.MemoryStream..ctor (byte[]) [0x00017] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.IO/MemoryStream.cs:81
605 * at (wrapper remoting-invoke-with-check) System.IO.MemoryStream..ctor (byte[]) <IL 0x00020, 0xffffffff>
606 * at System.Runtime.Remoting.Messaging.CADMethodCallMessage.GetArguments () [0x0000d] in /home/schani/Work/novell/trunk/mcs/class/corlib/System.Runtime.Remoting.Messaging/CADMessages.cs:327
607 * 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
608 * 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
609 * at (wrapper remoting-invoke-with-check) System.AppDomain.ProcessMessageInDomain (byte[],System.Runtime.Remoting.Messaging.CADMethodCallMessage,byte[]&,System.Runtime.Remoting.Messaging.CADMethodReturnMessage&) <IL 0x0003d, 0xffffffff>
610 * 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
611 * at (wrapper runtime-invoke) object.runtime_invoke_CrossAppDomainSink/ProcessMessageRes_object_object (object,intptr,intptr,intptr) <IL 0x0004c, 0xffffffff>
613 if (!strcmp (ref->vtable->klass->name_space, "System") &&
614 !strcmp (ref->vtable->klass->name, "Byte[]") &&
615 !strcmp (o->vtable->klass->name_space, "System.IO") &&
616 !strcmp (o->vtable->klass->name, "MemoryStream"))
618 /* append_job() in threadpool.c */
619 if (!strcmp (ref->vtable->klass->name_space, "System.Runtime.Remoting.Messaging") &&
620 !strcmp (ref->vtable->klass->name, "AsyncResult") &&
621 !strcmp (o->vtable->klass->name_space, "System") &&
622 !strcmp (o->vtable->klass->name, "Object[]") &&
623 mono_thread_pool_is_queue_array ((MonoArray*) o))
629 check_reference_for_xdomain (gpointer *ptr, char *obj, MonoDomain *domain)
631 MonoObject *o = (MonoObject*)(obj);
632 MonoObject *ref = (MonoObject*)*(ptr);
633 int offset = (char*)(ptr) - (char*)o;
635 MonoClassField *field;
638 if (!ref || ref->vtable->domain == domain)
640 if (is_xdomain_ref_allowed (ptr, obj, domain))
644 for (class = o->vtable->klass; class; class = class->parent) {
647 for (i = 0; i < class->field.count; ++i) {
648 if (class->fields[i].offset == offset) {
649 field = &class->fields[i];
657 if (ref->vtable->klass == mono_defaults.string_class)
658 str = mono_string_to_utf8 ((MonoString*)ref);
661 g_print ("xdomain reference in %p (%s.%s) at offset %d (%s) to %p (%s.%s) (%s) - pointed to by:\n",
662 o, o->vtable->klass->name_space, o->vtable->klass->name,
663 offset, field ? field->name : "",
664 ref, ref->vtable->klass->name_space, ref->vtable->klass->name, str ? str : "");
665 mono_gc_scan_for_specific_ref (o, TRUE);
671 #define HANDLE_PTR(ptr,obj) check_reference_for_xdomain ((ptr), (obj), domain)
674 scan_object_for_xdomain_refs (char *start, mword size, void *data)
676 MonoDomain *domain = ((MonoObject*)start)->vtable->domain;
678 #include "sgen-scan-object.h"
681 static gboolean scan_object_for_specific_ref_precise = TRUE;
684 #define HANDLE_PTR(ptr,obj) do { \
685 if ((MonoObject*)*(ptr) == key) { \
686 g_print ("found ref to %p in object %p (%s) at offset %td\n", \
687 key, (obj), safe_name ((obj)), ((char*)(ptr) - (char*)(obj))); \
692 scan_object_for_specific_ref (char *start, MonoObject *key)
696 if ((forwarded = SGEN_OBJECT_IS_FORWARDED (start)))
699 if (scan_object_for_specific_ref_precise) {
700 #include "sgen-scan-object.h"
702 mword *words = (mword*)start;
703 size_t size = safe_object_get_size ((MonoObject*)start);
705 for (i = 0; i < size / sizeof (mword); ++i) {
706 if (words [i] == (mword)key) {
707 g_print ("found possible ref to %p in object %p (%s) at offset %td\n",
708 key, start, safe_name (start), i * sizeof (mword));
715 sgen_scan_area_with_callback (char *start, char *end, IterateObjectCallbackFunc callback, void *data, gboolean allow_flags)
717 while (start < end) {
721 if (!*(void**)start) {
722 start += sizeof (void*); /* should be ALLOC_ALIGN, really */
727 if (!(obj = SGEN_OBJECT_IS_FORWARDED (start)))
733 size = ALIGN_UP (safe_object_get_size ((MonoObject*)obj));
735 if ((MonoVTable*)SGEN_LOAD_VTABLE (obj) != array_fill_vtable)
736 callback (obj, size, data);
743 scan_object_for_specific_ref_callback (char *obj, size_t size, MonoObject *key)
745 scan_object_for_specific_ref (obj, key);
749 check_root_obj_specific_ref (RootRecord *root, MonoObject *key, MonoObject *obj)
753 g_print ("found ref to %p in root record %p\n", key, root);
756 static MonoObject *check_key = NULL;
757 static RootRecord *check_root = NULL;
760 check_root_obj_specific_ref_from_marker (void **obj)
762 check_root_obj_specific_ref (check_root, check_key, *obj);
766 scan_roots_for_specific_ref (MonoObject *key, int root_type)
772 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
773 mword desc = root->root_desc;
777 switch (desc & ROOT_DESC_TYPE_MASK) {
778 case ROOT_DESC_BITMAP:
779 desc >>= ROOT_DESC_TYPE_SHIFT;
782 check_root_obj_specific_ref (root, key, *start_root);
787 case ROOT_DESC_COMPLEX: {
788 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
789 int bwords = (*bitmap_data) - 1;
790 void **start_run = start_root;
792 while (bwords-- > 0) {
793 gsize bmap = *bitmap_data++;
794 void **objptr = start_run;
797 check_root_obj_specific_ref (root, key, *objptr);
801 start_run += GC_BITS_PER_WORD;
805 case ROOT_DESC_USER: {
806 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
807 marker (start_root, check_root_obj_specific_ref_from_marker);
810 case ROOT_DESC_RUN_LEN:
811 g_assert_not_reached ();
813 g_assert_not_reached ();
815 } SGEN_HASH_TABLE_FOREACH_END;
822 mono_gc_scan_for_specific_ref (MonoObject *key, gboolean precise)
827 scan_object_for_specific_ref_precise = precise;
829 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
830 (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key, TRUE);
832 major_collector.iterate_objects (TRUE, TRUE, (IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
834 sgen_los_iterate_objects ((IterateObjectCallbackFunc)scan_object_for_specific_ref_callback, key);
836 scan_roots_for_specific_ref (key, ROOT_TYPE_NORMAL);
837 scan_roots_for_specific_ref (key, ROOT_TYPE_WBARRIER);
839 SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_PINNED], ptr, root) {
840 while (ptr < (void**)root->end_root) {
841 check_root_obj_specific_ref (root, *ptr, key);
844 } SGEN_HASH_TABLE_FOREACH_END;
848 need_remove_object_for_domain (char *start, MonoDomain *domain)
850 if (mono_object_domain (start) == domain) {
851 SGEN_LOG (4, "Need to cleanup object %p", start);
852 binary_protocol_cleanup (start, (gpointer)LOAD_VTABLE (start), safe_object_get_size ((MonoObject*)start));
859 process_object_for_domain_clearing (char *start, MonoDomain *domain)
861 GCVTable *vt = (GCVTable*)LOAD_VTABLE (start);
862 if (vt->klass == mono_defaults.internal_thread_class)
863 g_assert (mono_object_domain (start) == mono_get_root_domain ());
864 /* The object could be a proxy for an object in the domain
866 if (mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
867 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
869 /* The server could already have been zeroed out, so
870 we need to check for that, too. */
871 if (server && (!LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
872 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
873 ((MonoRealProxy*)start)->unwrapped_server = NULL;
878 static MonoDomain *check_domain = NULL;
881 check_obj_not_in_domain (void **o)
883 g_assert (((MonoObject*)(*o))->vtable->domain != check_domain);
887 scan_for_registered_roots_in_domain (MonoDomain *domain, int root_type)
891 check_domain = domain;
892 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
893 mword desc = root->root_desc;
895 /* The MonoDomain struct is allowed to hold
896 references to objects in its own domain. */
897 if (start_root == (void**)domain)
900 switch (desc & ROOT_DESC_TYPE_MASK) {
901 case ROOT_DESC_BITMAP:
902 desc >>= ROOT_DESC_TYPE_SHIFT;
904 if ((desc & 1) && *start_root)
905 check_obj_not_in_domain (*start_root);
910 case ROOT_DESC_COMPLEX: {
911 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
912 int bwords = (*bitmap_data) - 1;
913 void **start_run = start_root;
915 while (bwords-- > 0) {
916 gsize bmap = *bitmap_data++;
917 void **objptr = start_run;
919 if ((bmap & 1) && *objptr)
920 check_obj_not_in_domain (*objptr);
924 start_run += GC_BITS_PER_WORD;
928 case ROOT_DESC_USER: {
929 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
930 marker (start_root, check_obj_not_in_domain);
933 case ROOT_DESC_RUN_LEN:
934 g_assert_not_reached ();
936 g_assert_not_reached ();
938 } SGEN_HASH_TABLE_FOREACH_END;
944 check_for_xdomain_refs (void)
948 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
949 (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL, FALSE);
951 major_collector.iterate_objects (TRUE, TRUE, (IterateObjectCallbackFunc)scan_object_for_xdomain_refs, NULL);
953 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
954 scan_object_for_xdomain_refs (bigobj->data, bigobj->size, NULL);
958 clear_domain_process_object (char *obj, MonoDomain *domain)
962 process_object_for_domain_clearing (obj, domain);
963 remove = need_remove_object_for_domain (obj, domain);
965 if (remove && ((MonoObject*)obj)->synchronisation) {
966 void **dislink = mono_monitor_get_object_monitor_weak_link ((MonoObject*)obj);
968 sgen_register_disappearing_link (NULL, dislink, FALSE, TRUE);
975 clear_domain_process_minor_object_callback (char *obj, size_t size, MonoDomain *domain)
977 if (clear_domain_process_object (obj, domain))
978 memset (obj, 0, size);
982 clear_domain_process_major_object_callback (char *obj, size_t size, MonoDomain *domain)
984 clear_domain_process_object (obj, domain);
988 clear_domain_free_major_non_pinned_object_callback (char *obj, size_t size, MonoDomain *domain)
990 if (need_remove_object_for_domain (obj, domain))
991 major_collector.free_non_pinned_object (obj, size);
995 clear_domain_free_major_pinned_object_callback (char *obj, size_t size, MonoDomain *domain)
997 if (need_remove_object_for_domain (obj, domain))
998 major_collector.free_pinned_object (obj, size);
1002 * When appdomains are unloaded we can easily remove objects that have finalizers,
1003 * but all the others could still be present in random places on the heap.
1004 * We need a sweep to get rid of them even though it's going to be costly
1006 * The reason we need to remove them is because we access the vtable and class
1007 * structures to know the object size and the reference bitmap: once the domain is
1008 * unloaded the point to random memory.
1011 mono_gc_clear_domain (MonoDomain * domain)
1013 LOSObject *bigobj, *prev;
1018 sgen_process_fin_stage_entries ();
1019 sgen_process_dislink_stage_entries ();
1021 sgen_clear_nursery_fragments ();
1023 if (xdomain_checks && domain != mono_get_root_domain ()) {
1024 scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
1025 scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
1026 check_for_xdomain_refs ();
1029 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
1030 to memory returned to the OS.*/
1031 null_ephemerons_for_domain (domain);
1033 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
1034 sgen_null_links_for_domain (domain, i);
1036 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
1037 sgen_remove_finalizers_for_domain (domain, i);
1039 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
1040 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE);
1042 /* We need two passes over major and large objects because
1043 freeing such objects might give their memory back to the OS
1044 (in the case of large objects) or obliterate its vtable
1045 (pinned objects with major-copying or pinned and non-pinned
1046 objects with major-mark&sweep), but we might need to
1047 dereference a pointer from an object to another object if
1048 the first object is a proxy. */
1049 major_collector.iterate_objects (TRUE, TRUE, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
1050 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
1051 clear_domain_process_object (bigobj->data, domain);
1054 for (bigobj = los_object_list; bigobj;) {
1055 if (need_remove_object_for_domain (bigobj->data, domain)) {
1056 LOSObject *to_free = bigobj;
1058 prev->next = bigobj->next;
1060 los_object_list = bigobj->next;
1061 bigobj = bigobj->next;
1062 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
1063 sgen_los_free_object (to_free);
1067 bigobj = bigobj->next;
1069 major_collector.iterate_objects (TRUE, FALSE, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
1070 major_collector.iterate_objects (FALSE, TRUE, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
1072 if (G_UNLIKELY (do_pin_stats)) {
1073 if (domain == mono_get_root_domain ())
1074 sgen_pin_stats_print_class_stats ();
1081 * sgen_add_to_global_remset:
1083 * The global remset contains locations which point into newspace after
1084 * a minor collection. This can happen if the objects they point to are pinned.
1086 * LOCKING: If called from a parallel collector, the global remset
1087 * lock must be held. For serial collectors that is not necessary.
1090 sgen_add_to_global_remset (gpointer ptr)
1092 remset.record_pointer (ptr);
1096 * sgen_drain_gray_stack:
1098 * Scan objects in the gray stack until the stack is empty. This should be called
1099 * frequently after each object is copied, to achieve better locality and cache
1103 sgen_drain_gray_stack (GrayQueue *queue, int max_objs)
1106 ScanObjectFunc scan_func = current_object_ops.scan_object;
1108 if (max_objs == -1) {
1110 GRAY_OBJECT_DEQUEUE (queue, obj);
1113 SGEN_LOG (9, "Precise gray object scan %p (%s)", obj, safe_name (obj));
1114 scan_func (obj, queue);
1120 for (i = 0; i != max_objs; ++i) {
1121 GRAY_OBJECT_DEQUEUE (queue, obj);
1124 SGEN_LOG (9, "Precise gray object scan %p (%s)", obj, safe_name (obj));
1125 scan_func (obj, queue);
1127 } while (max_objs < 0);
1133 * Addresses from start to end are already sorted. This function finds
1134 * the object header for each address and pins the object. The
1135 * addresses must be inside the passed section. The (start of the)
1136 * address array is overwritten with the addresses of the actually
1137 * pinned objects. Return the number of pinned objects.
1140 pin_objects_from_addresses (GCMemSection *section, void **start, void **end, void *start_nursery, void *end_nursery, GrayQueue *queue)
1145 void *last_obj = NULL;
1146 size_t last_obj_size = 0;
1149 void **definitely_pinned = start;
1151 sgen_nursery_allocator_prepare_for_pinning ();
1153 while (start < end) {
1155 /* the range check should be reduntant */
1156 if (addr != last && addr >= start_nursery && addr < end_nursery) {
1157 SGEN_LOG (5, "Considering pinning addr %p", addr);
1158 /* multiple pointers to the same object */
1159 if (addr >= last_obj && (char*)addr < (char*)last_obj + last_obj_size) {
1163 idx = ((char*)addr - (char*)section->data) / SCAN_START_SIZE;
1164 g_assert (idx < section->num_scan_start);
1165 search_start = (void*)section->scan_starts [idx];
1166 if (!search_start || search_start > addr) {
1169 search_start = section->scan_starts [idx];
1170 if (search_start && search_start <= addr)
1173 if (!search_start || search_start > addr)
1174 search_start = start_nursery;
1176 if (search_start < last_obj)
1177 search_start = (char*)last_obj + last_obj_size;
1178 /* now addr should be in an object a short distance from search_start
1179 * Note that search_start must point to zeroed mem or point to an object.
1183 if (!*(void**)search_start) {
1184 /* Consistency check */
1186 for (frag = nursery_fragments; frag; frag = frag->next) {
1187 if (search_start >= frag->fragment_start && search_start < frag->fragment_end)
1188 g_assert_not_reached ();
1192 search_start = (void*)ALIGN_UP ((mword)search_start + sizeof (gpointer));
1195 last_obj = search_start;
1196 last_obj_size = ALIGN_UP (safe_object_get_size ((MonoObject*)search_start));
1198 if (((MonoObject*)last_obj)->synchronisation == GINT_TO_POINTER (-1)) {
1199 /* Marks the beginning of a nursery fragment, skip */
1201 SGEN_LOG (8, "Pinned try match %p (%s), size %zd", last_obj, safe_name (last_obj), last_obj_size);
1202 if (addr >= search_start && (char*)addr < (char*)last_obj + last_obj_size) {
1203 SGEN_LOG (4, "Pinned object %p, vtable %p (%s), count %d\n", search_start, *(void**)search_start, safe_name (search_start), count);
1204 binary_protocol_pin (search_start, (gpointer)LOAD_VTABLE (search_start), safe_object_get_size (search_start));
1205 if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
1206 int gen = sgen_ptr_in_nursery (search_start) ? GENERATION_NURSERY : GENERATION_OLD;
1207 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (search_start);
1208 MONO_GC_OBJ_PINNED ((mword)search_start, sgen_safe_object_get_size (search_start), vt->klass->name_space, vt->klass->name, gen);
1210 pin_object (search_start);
1211 GRAY_OBJECT_ENQUEUE (queue, search_start);
1212 if (G_UNLIKELY (do_pin_stats))
1213 sgen_pin_stats_register_object (search_start, last_obj_size);
1214 definitely_pinned [count] = search_start;
1219 /* skip to the next object */
1220 search_start = (void*)((char*)search_start + last_obj_size);
1221 } while (search_start <= addr);
1222 /* we either pinned the correct object or we ignored the addr because
1223 * it points to unused zeroed memory.
1229 //printf ("effective pinned: %d (at the end: %d)\n", count, (char*)end_nursery - (char*)last);
1230 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1231 GCRootReport report;
1233 for (idx = 0; idx < count; ++idx)
1234 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1235 notify_gc_roots (&report);
1237 stat_pinned_objects += count;
1242 sgen_pin_objects_in_section (GCMemSection *section, GrayQueue *queue)
1244 int num_entries = section->pin_queue_num_entries;
1246 void **start = section->pin_queue_start;
1248 reduced_to = pin_objects_from_addresses (section, start, start + num_entries,
1249 section->data, section->next_data, queue);
1250 section->pin_queue_num_entries = reduced_to;
1252 section->pin_queue_start = NULL;
1258 sgen_pin_object (void *object, GrayQueue *queue)
1260 if (sgen_collection_is_parallel ()) {
1262 /*object arrives pinned*/
1263 sgen_pin_stage_ptr (object);
1267 SGEN_PIN_OBJECT (object);
1268 sgen_pin_stage_ptr (object);
1270 if (G_UNLIKELY (do_pin_stats))
1271 sgen_pin_stats_register_object (object, safe_object_get_size (object));
1273 GRAY_OBJECT_ENQUEUE (queue, object);
1274 binary_protocol_pin (object, (gpointer)LOAD_VTABLE (object), safe_object_get_size (object));
1275 if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
1276 int gen = sgen_ptr_in_nursery (object) ? GENERATION_NURSERY : GENERATION_OLD;
1277 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (object);
1278 MONO_GC_OBJ_PINNED ((mword)object, sgen_safe_object_get_size (object), vt->klass->name_space, vt->klass->name, gen);
1283 sgen_parallel_pin_or_update (void **ptr, void *obj, MonoVTable *vt, SgenGrayQueue *queue)
1287 gboolean major_pinned = FALSE;
1289 if (sgen_ptr_in_nursery (obj)) {
1290 if (SGEN_CAS_PTR (obj, (void*)((mword)vt | SGEN_PINNED_BIT), vt) == vt) {
1291 sgen_pin_object (obj, queue);
1295 major_collector.pin_major_object (obj, queue);
1296 major_pinned = TRUE;
1299 vtable_word = *(mword*)obj;
1300 /*someone else forwarded it, update the pointer and bail out*/
1301 if (vtable_word & SGEN_FORWARDED_BIT) {
1302 *ptr = (void*)(vtable_word & ~SGEN_VTABLE_BITS_MASK);
1306 /*someone pinned it, nothing to do.*/
1307 if (vtable_word & SGEN_PINNED_BIT || major_pinned)
1312 /* Sort the addresses in array in increasing order.
1313 * Done using a by-the book heap sort. Which has decent and stable performance, is pretty cache efficient.
1316 sgen_sort_addresses (void **array, int size)
1321 for (i = 1; i < size; ++i) {
1324 int parent = (child - 1) / 2;
1326 if (array [parent] >= array [child])
1329 tmp = array [parent];
1330 array [parent] = array [child];
1331 array [child] = tmp;
1337 for (i = size - 1; i > 0; --i) {
1340 array [i] = array [0];
1346 while (root * 2 + 1 <= end) {
1347 int child = root * 2 + 1;
1349 if (child < end && array [child] < array [child + 1])
1351 if (array [root] >= array [child])
1355 array [root] = array [child];
1356 array [child] = tmp;
1364 * Scan the memory between start and end and queue values which could be pointers
1365 * to the area between start_nursery and end_nursery for later consideration.
1366 * Typically used for thread stacks.
1369 conservatively_pin_objects_from (void **start, void **end, void *start_nursery, void *end_nursery, int pin_type)
1373 #ifdef VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE
1374 VALGRIND_MAKE_MEM_DEFINED_IF_ADDRESSABLE (start, (char*)end - (char*)start);
1377 while (start < end) {
1378 if (*start >= start_nursery && *start < end_nursery) {
1380 * *start can point to the middle of an object
1381 * note: should we handle pointing at the end of an object?
1382 * pinning in C# code disallows pointing at the end of an object
1383 * but there is some small chance that an optimizing C compiler
1384 * may keep the only reference to an object by pointing
1385 * at the end of it. We ignore this small chance for now.
1386 * Pointers to the end of an object are indistinguishable
1387 * from pointers to the start of the next object in memory
1388 * so if we allow that we'd need to pin two objects...
1389 * We queue the pointer in an array, the
1390 * array will then be sorted and uniqued. This way
1391 * we can coalesce several pinning pointers and it should
1392 * be faster since we'd do a memory scan with increasing
1393 * addresses. Note: we can align the address to the allocation
1394 * alignment, so the unique process is more effective.
1396 mword addr = (mword)*start;
1397 addr &= ~(ALLOC_ALIGN - 1);
1398 if (addr >= (mword)start_nursery && addr < (mword)end_nursery) {
1399 SGEN_LOG (6, "Pinning address %p from %p", (void*)addr, start);
1400 sgen_pin_stage_ptr ((void*)addr);
1403 if (G_UNLIKELY (do_pin_stats)) {
1404 if (ptr_in_nursery ((void*)addr))
1405 sgen_pin_stats_register_address ((char*)addr, pin_type);
1411 SGEN_LOG (7, "found %d potential pinned heap pointers", count);
1415 * The first thing we do in a collection is to identify pinned objects.
1416 * This function considers all the areas of memory that need to be
1417 * conservatively scanned.
1420 pin_from_roots (void *start_nursery, void *end_nursery, GrayQueue *queue)
1424 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);
1425 /* objects pinned from the API are inside these roots */
1426 SGEN_HASH_TABLE_FOREACH (&roots_hash [ROOT_TYPE_PINNED], start_root, root) {
1427 SGEN_LOG (6, "Pinned roots %p-%p", start_root, root->end_root);
1428 conservatively_pin_objects_from (start_root, (void**)root->end_root, start_nursery, end_nursery, PIN_TYPE_OTHER);
1429 } SGEN_HASH_TABLE_FOREACH_END;
1430 /* now deal with the thread stacks
1431 * in the future we should be able to conservatively scan only:
1432 * *) the cpu registers
1433 * *) the unmanaged stack frames
1434 * *) the _last_ managed stack frame
1435 * *) pointers slots in managed frames
1437 scan_thread_data (start_nursery, end_nursery, FALSE, queue);
1441 CopyOrMarkObjectFunc func;
1443 } UserCopyOrMarkData;
1445 static MonoNativeTlsKey user_copy_or_mark_key;
1448 init_user_copy_or_mark_key (void)
1450 mono_native_tls_alloc (&user_copy_or_mark_key, NULL);
1454 set_user_copy_or_mark_data (UserCopyOrMarkData *data)
1456 mono_native_tls_set_value (user_copy_or_mark_key, data);
1460 single_arg_user_copy_or_mark (void **obj)
1462 UserCopyOrMarkData *data = mono_native_tls_get_value (user_copy_or_mark_key);
1464 data->func (obj, data->queue);
1468 * The memory area from start_root to end_root contains pointers to objects.
1469 * Their position is precisely described by @desc (this means that the pointer
1470 * can be either NULL or the pointer to the start of an object).
1471 * This functions copies them to to_space updates them.
1473 * This function is not thread-safe!
1476 precisely_scan_objects_from (CopyOrMarkObjectFunc copy_func, void** start_root, void** end_root, char* n_start, char *n_end, mword desc, GrayQueue *queue)
1478 switch (desc & ROOT_DESC_TYPE_MASK) {
1479 case ROOT_DESC_BITMAP:
1480 desc >>= ROOT_DESC_TYPE_SHIFT;
1482 if ((desc & 1) && *start_root) {
1483 copy_func (start_root, queue);
1484 SGEN_LOG (9, "Overwrote root at %p with %p", start_root, *start_root);
1485 sgen_drain_gray_stack (queue, -1);
1491 case ROOT_DESC_COMPLEX: {
1492 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1493 int bwords = (*bitmap_data) - 1;
1494 void **start_run = start_root;
1496 while (bwords-- > 0) {
1497 gsize bmap = *bitmap_data++;
1498 void **objptr = start_run;
1500 if ((bmap & 1) && *objptr) {
1501 copy_func (objptr, queue);
1502 SGEN_LOG (9, "Overwrote root at %p with %p", objptr, *objptr);
1503 sgen_drain_gray_stack (queue, -1);
1508 start_run += GC_BITS_PER_WORD;
1512 case ROOT_DESC_USER: {
1513 UserCopyOrMarkData data = { copy_func, queue };
1514 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
1515 set_user_copy_or_mark_data (&data);
1516 marker (start_root, single_arg_user_copy_or_mark);
1517 set_user_copy_or_mark_data (NULL);
1520 case ROOT_DESC_RUN_LEN:
1521 g_assert_not_reached ();
1523 g_assert_not_reached ();
1528 reset_heap_boundaries (void)
1530 lowest_heap_address = ~(mword)0;
1531 highest_heap_address = 0;
1535 sgen_update_heap_boundaries (mword low, mword high)
1540 old = lowest_heap_address;
1543 } while (SGEN_CAS_PTR ((gpointer*)&lowest_heap_address, (gpointer)low, (gpointer)old) != (gpointer)old);
1546 old = highest_heap_address;
1549 } while (SGEN_CAS_PTR ((gpointer*)&highest_heap_address, (gpointer)high, (gpointer)old) != (gpointer)old);
1553 * Allocate and setup the data structures needed to be able to allocate objects
1554 * in the nursery. The nursery is stored in nursery_section.
1557 alloc_nursery (void)
1559 GCMemSection *section;
1564 if (nursery_section)
1566 SGEN_LOG (2, "Allocating nursery size: %lu", (unsigned long)sgen_nursery_size);
1567 /* later we will alloc a larger area for the nursery but only activate
1568 * what we need. The rest will be used as expansion if we have too many pinned
1569 * objects in the existing nursery.
1571 /* FIXME: handle OOM */
1572 section = sgen_alloc_internal (INTERNAL_MEM_SECTION);
1574 alloc_size = sgen_nursery_size;
1576 /* If there isn't enough space even for the nursery we should simply abort. */
1577 g_assert (sgen_memgov_try_alloc_space (alloc_size, SPACE_NURSERY));
1579 #ifdef SGEN_ALIGN_NURSERY
1580 data = major_collector.alloc_heap (alloc_size, alloc_size, DEFAULT_NURSERY_BITS);
1582 data = major_collector.alloc_heap (alloc_size, 0, DEFAULT_NURSERY_BITS);
1584 sgen_update_heap_boundaries ((mword)data, (mword)(data + sgen_nursery_size));
1585 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 ());
1586 section->data = section->next_data = data;
1587 section->size = alloc_size;
1588 section->end_data = data + sgen_nursery_size;
1589 scan_starts = (alloc_size + SCAN_START_SIZE - 1) / SCAN_START_SIZE;
1590 section->scan_starts = sgen_alloc_internal_dynamic (sizeof (char*) * scan_starts, INTERNAL_MEM_SCAN_STARTS, TRUE);
1591 section->num_scan_start = scan_starts;
1592 section->block.role = MEMORY_ROLE_GEN0;
1593 section->block.next = NULL;
1595 nursery_section = section;
1597 sgen_nursery_allocator_set_nursery_bounds (data, data + sgen_nursery_size);
1601 mono_gc_get_nursery (int *shift_bits, size_t *size)
1603 *size = sgen_nursery_size;
1604 #ifdef SGEN_ALIGN_NURSERY
1605 *shift_bits = DEFAULT_NURSERY_BITS;
1609 return sgen_get_nursery_start ();
1613 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1615 SgenThreadInfo *info = mono_thread_info_current ();
1617 /* Could be called from sgen_thread_unregister () with a NULL info */
1620 info->stopped_domain = domain;
1625 mono_gc_precise_stack_mark_enabled (void)
1627 return !conservative_stack_mark;
1631 mono_gc_get_logfile (void)
1633 return gc_debug_file;
1637 report_finalizer_roots_list (FinalizeReadyEntry *list)
1639 GCRootReport report;
1640 FinalizeReadyEntry *fin;
1643 for (fin = list; fin; fin = fin->next) {
1646 add_profile_gc_root (&report, fin->object, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1648 notify_gc_roots (&report);
1652 report_finalizer_roots (void)
1654 report_finalizer_roots_list (fin_ready_list);
1655 report_finalizer_roots_list (critical_fin_list);
1658 static GCRootReport *root_report;
1661 single_arg_report_root (void **obj)
1664 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1668 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1670 switch (desc & ROOT_DESC_TYPE_MASK) {
1671 case ROOT_DESC_BITMAP:
1672 desc >>= ROOT_DESC_TYPE_SHIFT;
1674 if ((desc & 1) && *start_root) {
1675 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1681 case ROOT_DESC_COMPLEX: {
1682 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1683 int bwords = (*bitmap_data) - 1;
1684 void **start_run = start_root;
1686 while (bwords-- > 0) {
1687 gsize bmap = *bitmap_data++;
1688 void **objptr = start_run;
1690 if ((bmap & 1) && *objptr) {
1691 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1696 start_run += GC_BITS_PER_WORD;
1700 case ROOT_DESC_USER: {
1701 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
1702 root_report = report;
1703 marker (start_root, single_arg_report_root);
1706 case ROOT_DESC_RUN_LEN:
1707 g_assert_not_reached ();
1709 g_assert_not_reached ();
1714 report_registered_roots_by_type (int root_type)
1716 GCRootReport report;
1720 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
1721 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1722 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1723 } SGEN_HASH_TABLE_FOREACH_END;
1724 notify_gc_roots (&report);
1728 report_registered_roots (void)
1730 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1731 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
1735 scan_finalizer_entries (CopyOrMarkObjectFunc copy_func, FinalizeReadyEntry *list, GrayQueue *queue)
1737 FinalizeReadyEntry *fin;
1739 for (fin = list; fin; fin = fin->next) {
1742 SGEN_LOG (5, "Scan of fin ready object: %p (%s)\n", fin->object, safe_name (fin->object));
1743 copy_func (&fin->object, queue);
1748 generation_name (int generation)
1750 switch (generation) {
1751 case GENERATION_NURSERY: return "nursery";
1752 case GENERATION_OLD: return "old";
1753 default: g_assert_not_reached ();
1758 sgen_generation_name (int generation)
1760 return generation_name (generation);
1763 SgenObjectOperations *
1764 sgen_get_current_object_ops (void){
1765 return ¤t_object_ops;
1770 finish_gray_stack (char *start_addr, char *end_addr, int generation, GrayQueue *queue)
1774 int done_with_ephemerons, ephemeron_rounds = 0;
1775 CopyOrMarkObjectFunc copy_func = current_object_ops.copy_or_mark_object;
1778 * We copied all the reachable objects. Now it's the time to copy
1779 * the objects that were not referenced by the roots, but by the copied objects.
1780 * we built a stack of objects pointed to by gray_start: they are
1781 * additional roots and we may add more items as we go.
1782 * We loop until gray_start == gray_objects which means no more objects have
1783 * been added. Note this is iterative: no recursion is involved.
1784 * We need to walk the LO list as well in search of marked big objects
1785 * (use a flag since this is needed only on major collections). We need to loop
1786 * here as well, so keep a counter of marked LO (increasing it in copy_object).
1787 * To achieve better cache locality and cache usage, we drain the gray stack
1788 * frequently, after each object is copied, and just finish the work here.
1790 sgen_drain_gray_stack (queue, -1);
1792 SGEN_LOG (2, "%s generation done", generation_name (generation));
1795 Reset bridge data, we might have lingering data from a previous collection if this is a major
1796 collection trigged by minor overflow.
1798 We must reset the gathered bridges since their original block might be evacuated due to major
1799 fragmentation in the meanwhile and the bridge code should not have to deal with that.
1801 sgen_bridge_reset_data ();
1804 * Walk the ephemeron tables marking all values with reachable keys. This must be completely done
1805 * before processing finalizable objects or non-tracking weak hamdle to avoid finalizing/clearing
1806 * objects that are in fact reachable.
1808 done_with_ephemerons = 0;
1810 done_with_ephemerons = mark_ephemerons_in_range (copy_func, start_addr, end_addr, queue);
1811 sgen_drain_gray_stack (queue, -1);
1813 } while (!done_with_ephemerons);
1815 sgen_scan_togglerefs (copy_func, start_addr, end_addr, queue);
1816 if (generation == GENERATION_OLD)
1817 sgen_scan_togglerefs (copy_func, sgen_get_nursery_start (), sgen_get_nursery_end (), queue);
1819 if (sgen_need_bridge_processing ()) {
1820 sgen_collect_bridge_objects (copy_func, start_addr, end_addr, generation, queue);
1821 if (generation == GENERATION_OLD)
1822 sgen_collect_bridge_objects (copy_func, sgen_get_nursery_start (), sgen_get_nursery_end (), GENERATION_NURSERY, queue);
1826 Make sure we drain the gray stack before processing disappearing links and finalizers.
1827 If we don't make sure it is empty we might wrongly see a live object as dead.
1829 sgen_drain_gray_stack (queue, -1);
1832 We must clear weak links that don't track resurrection before processing object ready for
1833 finalization so they can be cleared before that.
1835 sgen_null_link_in_range (copy_func, start_addr, end_addr, generation, TRUE, queue);
1836 if (generation == GENERATION_OLD)
1837 sgen_null_link_in_range (copy_func, start_addr, end_addr, GENERATION_NURSERY, TRUE, queue);
1840 /* walk the finalization queue and move also the objects that need to be
1841 * finalized: use the finalized objects as new roots so the objects they depend
1842 * on are also not reclaimed. As with the roots above, only objects in the nursery
1843 * are marked/copied.
1845 sgen_finalize_in_range (copy_func, start_addr, end_addr, generation, queue);
1846 if (generation == GENERATION_OLD)
1847 sgen_finalize_in_range (copy_func, sgen_get_nursery_start (), sgen_get_nursery_end (), GENERATION_NURSERY, queue);
1848 /* drain the new stack that might have been created */
1849 SGEN_LOG (6, "Precise scan of gray area post fin");
1850 sgen_drain_gray_stack (queue, -1);
1853 * This must be done again after processing finalizable objects since CWL slots are cleared only after the key is finalized.
1855 done_with_ephemerons = 0;
1857 done_with_ephemerons = mark_ephemerons_in_range (copy_func, start_addr, end_addr, queue);
1858 sgen_drain_gray_stack (queue, -1);
1860 } while (!done_with_ephemerons);
1863 * Clear ephemeron pairs with unreachable keys.
1864 * We pass the copy func so we can figure out if an array was promoted or not.
1866 clear_unreachable_ephemerons (copy_func, start_addr, end_addr, queue);
1869 SGEN_LOG (2, "Finalize queue handling scan for %s generation: %d usecs %d ephemeron rounds", generation_name (generation), TV_ELAPSED (atv, btv), ephemeron_rounds);
1872 * handle disappearing links
1873 * Note we do this after checking the finalization queue because if an object
1874 * survives (at least long enough to be finalized) we don't clear the link.
1875 * This also deals with a possible issue with the monitor reclamation: with the Boehm
1876 * GC a finalized object my lose the monitor because it is cleared before the finalizer is
1879 g_assert (sgen_gray_object_queue_is_empty (queue));
1881 sgen_null_link_in_range (copy_func, start_addr, end_addr, generation, FALSE, queue);
1882 if (generation == GENERATION_OLD)
1883 sgen_null_link_in_range (copy_func, start_addr, end_addr, GENERATION_NURSERY, FALSE, queue);
1884 if (sgen_gray_object_queue_is_empty (queue))
1886 sgen_drain_gray_stack (queue, -1);
1889 g_assert (sgen_gray_object_queue_is_empty (queue));
1893 sgen_check_section_scan_starts (GCMemSection *section)
1896 for (i = 0; i < section->num_scan_start; ++i) {
1897 if (section->scan_starts [i]) {
1898 guint size = safe_object_get_size ((MonoObject*) section->scan_starts [i]);
1899 g_assert (size >= sizeof (MonoObject) && size <= MAX_SMALL_OBJ_SIZE);
1905 check_scan_starts (void)
1907 if (!do_scan_starts_check)
1909 sgen_check_section_scan_starts (nursery_section);
1910 major_collector.check_scan_starts ();
1914 scan_from_registered_roots (CopyOrMarkObjectFunc copy_func, char *addr_start, char *addr_end, int root_type, GrayQueue *queue)
1918 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
1919 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1920 precisely_scan_objects_from (copy_func, start_root, (void**)root->end_root, addr_start, addr_end, root->root_desc, queue);
1921 } SGEN_HASH_TABLE_FOREACH_END;
1925 sgen_dump_occupied (char *start, char *end, char *section_start)
1927 fprintf (heap_dump_file, "<occupied offset=\"%td\" size=\"%td\"/>\n", start - section_start, end - start);
1931 sgen_dump_section (GCMemSection *section, const char *type)
1933 char *start = section->data;
1934 char *end = section->data + section->size;
1935 char *occ_start = NULL;
1937 char *old_start = NULL; /* just for debugging */
1939 fprintf (heap_dump_file, "<section type=\"%s\" size=\"%lu\">\n", type, (unsigned long)section->size);
1941 while (start < end) {
1945 if (!*(void**)start) {
1947 sgen_dump_occupied (occ_start, start, section->data);
1950 start += sizeof (void*); /* should be ALLOC_ALIGN, really */
1953 g_assert (start < section->next_data);
1958 vt = (GCVTable*)LOAD_VTABLE (start);
1961 size = ALIGN_UP (safe_object_get_size ((MonoObject*) start));
1964 fprintf (heap_dump_file, "<object offset=\"%d\" class=\"%s.%s\" size=\"%d\"/>\n",
1965 start - section->data,
1966 vt->klass->name_space, vt->klass->name,
1974 sgen_dump_occupied (occ_start, start, section->data);
1976 fprintf (heap_dump_file, "</section>\n");
1980 dump_object (MonoObject *obj, gboolean dump_location)
1982 static char class_name [1024];
1984 MonoClass *class = mono_object_class (obj);
1988 * Python's XML parser is too stupid to parse angle brackets
1989 * in strings, so we just ignore them;
1992 while (class->name [i] && j < sizeof (class_name) - 1) {
1993 if (!strchr ("<>\"", class->name [i]))
1994 class_name [j++] = class->name [i];
1997 g_assert (j < sizeof (class_name));
2000 fprintf (heap_dump_file, "<object class=\"%s.%s\" size=\"%d\"",
2001 class->name_space, class_name,
2002 safe_object_get_size (obj));
2003 if (dump_location) {
2004 const char *location;
2005 if (ptr_in_nursery (obj))
2006 location = "nursery";
2007 else if (safe_object_get_size (obj) <= MAX_SMALL_OBJ_SIZE)
2011 fprintf (heap_dump_file, " location=\"%s\"", location);
2013 fprintf (heap_dump_file, "/>\n");
2017 dump_heap (const char *type, int num, const char *reason)
2022 fprintf (heap_dump_file, "<collection type=\"%s\" num=\"%d\"", type, num);
2024 fprintf (heap_dump_file, " reason=\"%s\"", reason);
2025 fprintf (heap_dump_file, ">\n");
2026 fprintf (heap_dump_file, "<other-mem-usage type=\"mempools\" size=\"%ld\"/>\n", mono_mempool_get_bytes_allocated ());
2027 sgen_dump_internal_mem_usage (heap_dump_file);
2028 fprintf (heap_dump_file, "<pinned type=\"stack\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_STACK));
2029 /* fprintf (heap_dump_file, "<pinned type=\"static-data\" bytes=\"%d\"/>\n", pinned_byte_counts [PIN_TYPE_STATIC_DATA]); */
2030 fprintf (heap_dump_file, "<pinned type=\"other\" bytes=\"%zu\"/>\n", sgen_pin_stats_get_pinned_byte_count (PIN_TYPE_OTHER));
2032 fprintf (heap_dump_file, "<pinned-objects>\n");
2033 for (list = sgen_pin_stats_get_object_list (); list; list = list->next)
2034 dump_object (list->obj, TRUE);
2035 fprintf (heap_dump_file, "</pinned-objects>\n");
2037 sgen_dump_section (nursery_section, "nursery");
2039 major_collector.dump_heap (heap_dump_file);
2041 fprintf (heap_dump_file, "<los>\n");
2042 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
2043 dump_object ((MonoObject*)bigobj->data, FALSE);
2044 fprintf (heap_dump_file, "</los>\n");
2046 fprintf (heap_dump_file, "</collection>\n");
2050 sgen_register_moved_object (void *obj, void *destination)
2052 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2054 /* FIXME: handle this for parallel collector */
2055 g_assert (!sgen_collection_is_parallel ());
2057 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2058 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2059 moved_objects_idx = 0;
2061 moved_objects [moved_objects_idx++] = obj;
2062 moved_objects [moved_objects_idx++] = destination;
2068 static gboolean inited = FALSE;
2073 mono_counters_register ("Minor fragment clear", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_pre_collection_fragment_clear);
2074 mono_counters_register ("Minor pinning", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_pinning);
2075 mono_counters_register ("Minor scan remembered set", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_remsets);
2076 mono_counters_register ("Minor scan pinned", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_pinned);
2077 mono_counters_register ("Minor scan registered roots", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_registered_roots);
2078 mono_counters_register ("Minor scan thread data", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_scan_thread_data);
2079 mono_counters_register ("Minor finish gray stack", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_finish_gray_stack);
2080 mono_counters_register ("Minor fragment creation", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_minor_fragment_creation);
2082 mono_counters_register ("Major fragment clear", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_pre_collection_fragment_clear);
2083 mono_counters_register ("Major pinning", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_pinning);
2084 mono_counters_register ("Major scan pinned", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_pinned);
2085 mono_counters_register ("Major scan registered roots", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_registered_roots);
2086 mono_counters_register ("Major scan thread data", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_thread_data);
2087 mono_counters_register ("Major scan alloc_pinned", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_alloc_pinned);
2088 mono_counters_register ("Major scan finalized", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_finalized);
2089 mono_counters_register ("Major scan big objects", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_scan_big_objects);
2090 mono_counters_register ("Major finish gray stack", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_finish_gray_stack);
2091 mono_counters_register ("Major free big objects", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_free_bigobjs);
2092 mono_counters_register ("Major LOS sweep", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_los_sweep);
2093 mono_counters_register ("Major sweep", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_sweep);
2094 mono_counters_register ("Major fragment creation", MONO_COUNTER_GC | MONO_COUNTER_TIME_INTERVAL, &time_major_fragment_creation);
2096 mono_counters_register ("Number of pinned objects", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_pinned_objects);
2098 #ifdef HEAVY_STATISTICS
2099 mono_counters_register ("WBarrier set field", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_set_field);
2100 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_set_arrayref);
2101 mono_counters_register ("WBarrier arrayref copy", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_arrayref_copy);
2102 mono_counters_register ("WBarrier generic store called", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_generic_store);
2103 mono_counters_register ("WBarrier set root", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_set_root);
2104 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_value_copy);
2105 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_INT, &stat_wbarrier_object_copy);
2107 mono_counters_register ("# objects allocated degraded", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_objects_alloced_degraded);
2108 mono_counters_register ("bytes allocated degraded", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_bytes_alloced_degraded);
2110 mono_counters_register ("# copy_object() called (nursery)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_copy_object_called_nursery);
2111 mono_counters_register ("# objects copied (nursery)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_objects_copied_nursery);
2112 mono_counters_register ("# copy_object() called (major)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_copy_object_called_major);
2113 mono_counters_register ("# objects copied (major)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_objects_copied_major);
2115 mono_counters_register ("# scan_object() called (nursery)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_scan_object_called_nursery);
2116 mono_counters_register ("# scan_object() called (major)", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_scan_object_called_major);
2118 mono_counters_register ("Slots allocated in vain", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_slots_allocated_in_vain);
2120 mono_counters_register ("# nursery copy_object() failed from space", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_from_space);
2121 mono_counters_register ("# nursery copy_object() failed forwarded", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_forwarded);
2122 mono_counters_register ("# nursery copy_object() failed pinned", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_pinned);
2123 mono_counters_register ("# nursery copy_object() failed to space", MONO_COUNTER_GC | MONO_COUNTER_LONG, &stat_nursery_copy_object_failed_to_space);
2125 sgen_nursery_allocator_init_heavy_stats ();
2126 sgen_alloc_init_heavy_stats ();
2134 reset_pinned_from_failed_allocation (void)
2136 bytes_pinned_from_failed_allocation = 0;
2140 sgen_set_pinned_from_failed_allocation (mword objsize)
2142 bytes_pinned_from_failed_allocation += objsize;
2146 sgen_collection_is_parallel (void)
2148 switch (current_collection_generation) {
2149 case GENERATION_NURSERY:
2150 return nursery_collection_is_parallel;
2151 case GENERATION_OLD:
2152 return major_collector.is_parallel;
2154 g_error ("Invalid current generation %d", current_collection_generation);
2162 } FinishRememberedSetScanJobData;
2165 job_finish_remembered_set_scan (WorkerData *worker_data, void *job_data_untyped)
2167 FinishRememberedSetScanJobData *job_data = job_data_untyped;
2169 remset.finish_scan_remsets (job_data->heap_start, job_data->heap_end, sgen_workers_get_job_gray_queue (worker_data));
2174 CopyOrMarkObjectFunc func;
2178 } ScanFromRegisteredRootsJobData;
2181 job_scan_from_registered_roots (WorkerData *worker_data, void *job_data_untyped)
2183 ScanFromRegisteredRootsJobData *job_data = job_data_untyped;
2185 scan_from_registered_roots (job_data->func,
2186 job_data->heap_start, job_data->heap_end,
2187 job_data->root_type,
2188 sgen_workers_get_job_gray_queue (worker_data));
2195 } ScanThreadDataJobData;
2198 job_scan_thread_data (WorkerData *worker_data, void *job_data_untyped)
2200 ScanThreadDataJobData *job_data = job_data_untyped;
2202 scan_thread_data (job_data->heap_start, job_data->heap_end, TRUE,
2203 sgen_workers_get_job_gray_queue (worker_data));
2208 FinalizeReadyEntry *list;
2209 } ScanFinalizerEntriesJobData;
2212 job_scan_finalizer_entries (WorkerData *worker_data, void *job_data_untyped)
2214 ScanFinalizerEntriesJobData *job_data = job_data_untyped;
2216 scan_finalizer_entries (current_object_ops.copy_or_mark_object,
2218 sgen_workers_get_job_gray_queue (worker_data));
2222 verify_scan_starts (char *start, char *end)
2226 for (i = 0; i < nursery_section->num_scan_start; ++i) {
2227 char *addr = nursery_section->scan_starts [i];
2228 if (addr > start && addr < end)
2229 SGEN_LOG (1, "NFC-BAD SCAN START [%d] %p for obj [%p %p]", i, addr, start, end);
2234 verify_nursery (void)
2236 char *start, *end, *cur, *hole_start;
2238 if (!do_verify_nursery)
2241 /*This cleans up unused fragments */
2242 sgen_nursery_allocator_prepare_for_pinning ();
2244 hole_start = start = cur = sgen_get_nursery_start ();
2245 end = sgen_get_nursery_end ();
2250 if (!*(void**)cur) {
2251 cur += sizeof (void*);
2255 if (object_is_forwarded (cur))
2256 SGEN_LOG (1, "FORWARDED OBJ %p", cur);
2257 else if (object_is_pinned (cur))
2258 SGEN_LOG (1, "PINNED OBJ %p", cur);
2260 ss = safe_object_get_size ((MonoObject*)cur);
2261 size = ALIGN_UP (safe_object_get_size ((MonoObject*)cur));
2262 verify_scan_starts (cur, cur + size);
2263 if (do_dump_nursery_content) {
2264 if (cur > hole_start)
2265 SGEN_LOG (1, "HOLE [%p %p %d]", hole_start, cur, (int)(cur - hole_start));
2266 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 ());
2274 * Collect objects in the nursery. Returns whether to trigger a major
2278 collect_nursery (void)
2280 gboolean needs_major;
2281 size_t max_garbage_amount;
2283 FinishRememberedSetScanJobData frssjd;
2284 ScanFromRegisteredRootsJobData scrrjd_normal, scrrjd_wbarrier;
2285 ScanFinalizerEntriesJobData sfejd_fin_ready, sfejd_critical_fin;
2286 ScanThreadDataJobData stdjd;
2287 mword fragment_total;
2288 TV_DECLARE (all_atv);
2289 TV_DECLARE (all_btv);
2293 if (disable_minor_collections)
2296 MONO_GC_BEGIN (GENERATION_NURSERY);
2300 #ifndef DISABLE_PERFCOUNTERS
2301 mono_perfcounters->gc_collections0++;
2304 current_collection_generation = GENERATION_NURSERY;
2305 if (sgen_collection_is_parallel ())
2306 current_object_ops = sgen_minor_collector.parallel_ops;
2308 current_object_ops = sgen_minor_collector.serial_ops;
2310 reset_pinned_from_failed_allocation ();
2312 binary_protocol_collection (stat_minor_gcs, GENERATION_NURSERY);
2313 check_scan_starts ();
2315 sgen_nursery_alloc_prepare_for_minor ();
2319 nursery_next = sgen_nursery_alloc_get_upper_alloc_bound ();
2320 /* FIXME: optimize later to use the higher address where an object can be present */
2321 nursery_next = MAX (nursery_next, sgen_get_nursery_end ());
2323 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 ()));
2324 max_garbage_amount = nursery_next - sgen_get_nursery_start ();
2325 g_assert (nursery_section->size >= max_garbage_amount);
2327 /* world must be stopped already */
2328 TV_GETTIME (all_atv);
2332 time_minor_pre_collection_fragment_clear += TV_ELAPSED (atv, btv);
2334 if (xdomain_checks) {
2335 sgen_clear_nursery_fragments ();
2336 check_for_xdomain_refs ();
2339 nursery_section->next_data = nursery_next;
2341 major_collector.start_nursery_collection ();
2343 sgen_memgov_minor_collection_start ();
2345 sgen_gray_object_queue_init (&gray_queue);
2346 sgen_workers_init_distribute_gray_queue ();
2349 gc_stats.minor_gc_count ++;
2351 if (remset.prepare_for_minor_collection)
2352 remset.prepare_for_minor_collection ();
2354 sgen_process_fin_stage_entries ();
2355 sgen_process_dislink_stage_entries ();
2357 /* pin from pinned handles */
2358 sgen_init_pinning ();
2359 mono_profiler_gc_event (MONO_GC_EVENT_MARK_START, 0);
2360 pin_from_roots (sgen_get_nursery_start (), nursery_next, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2361 /* identify pinned objects */
2362 sgen_optimize_pin_queue (0);
2363 sgen_pinning_setup_section (nursery_section);
2364 sgen_pin_objects_in_section (nursery_section, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2365 sgen_pinning_trim_queue_to_section (nursery_section);
2368 time_minor_pinning += TV_ELAPSED (btv, atv);
2369 SGEN_LOG (2, "Finding pinned pointers: %d in %d usecs", sgen_get_pinned_count (), TV_ELAPSED (btv, atv));
2370 SGEN_LOG (4, "Start scan with %d pinned objects", sgen_get_pinned_count ());
2372 if (whole_heap_check_before_collection)
2373 sgen_check_whole_heap ();
2374 if (consistency_check_at_minor_collection)
2375 sgen_check_consistency ();
2377 sgen_workers_start_all_workers ();
2380 * Perform the sequential part of remembered set scanning.
2381 * This usually involves scanning global information that might later be produced by evacuation.
2383 if (remset.begin_scan_remsets)
2384 remset.begin_scan_remsets (sgen_get_nursery_start (), nursery_next, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2386 sgen_workers_start_marking ();
2388 frssjd.heap_start = sgen_get_nursery_start ();
2389 frssjd.heap_end = nursery_next;
2390 sgen_workers_enqueue_job (job_finish_remembered_set_scan, &frssjd);
2392 /* we don't have complete write barrier yet, so we scan all the old generation sections */
2394 time_minor_scan_remsets += TV_ELAPSED (atv, btv);
2395 SGEN_LOG (2, "Old generation scan: %d usecs", TV_ELAPSED (atv, btv));
2397 if (!sgen_collection_is_parallel ())
2398 sgen_drain_gray_stack (&gray_queue, -1);
2400 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2401 report_registered_roots ();
2402 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2403 report_finalizer_roots ();
2405 time_minor_scan_pinned += TV_ELAPSED (btv, atv);
2407 /* registered roots, this includes static fields */
2408 scrrjd_normal.func = current_object_ops.copy_or_mark_object;
2409 scrrjd_normal.heap_start = sgen_get_nursery_start ();
2410 scrrjd_normal.heap_end = nursery_next;
2411 scrrjd_normal.root_type = ROOT_TYPE_NORMAL;
2412 sgen_workers_enqueue_job (job_scan_from_registered_roots, &scrrjd_normal);
2414 scrrjd_wbarrier.func = current_object_ops.copy_or_mark_object;
2415 scrrjd_wbarrier.heap_start = sgen_get_nursery_start ();
2416 scrrjd_wbarrier.heap_end = nursery_next;
2417 scrrjd_wbarrier.root_type = ROOT_TYPE_WBARRIER;
2418 sgen_workers_enqueue_job (job_scan_from_registered_roots, &scrrjd_wbarrier);
2421 time_minor_scan_registered_roots += TV_ELAPSED (atv, btv);
2424 stdjd.heap_start = sgen_get_nursery_start ();
2425 stdjd.heap_end = nursery_next;
2426 sgen_workers_enqueue_job (job_scan_thread_data, &stdjd);
2429 time_minor_scan_thread_data += TV_ELAPSED (btv, atv);
2432 if (sgen_collection_is_parallel ()) {
2433 while (!sgen_gray_object_queue_is_empty (WORKERS_DISTRIBUTE_GRAY_QUEUE)) {
2434 sgen_workers_distribute_gray_queue_sections ();
2438 sgen_workers_join ();
2440 if (sgen_collection_is_parallel ())
2441 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
2443 /* Scan the list of objects ready for finalization. If */
2444 sfejd_fin_ready.list = fin_ready_list;
2445 sgen_workers_enqueue_job (job_scan_finalizer_entries, &sfejd_fin_ready);
2447 sfejd_critical_fin.list = critical_fin_list;
2448 sgen_workers_enqueue_job (job_scan_finalizer_entries, &sfejd_critical_fin);
2450 finish_gray_stack (sgen_get_nursery_start (), nursery_next, GENERATION_NURSERY, &gray_queue);
2452 time_minor_finish_gray_stack += TV_ELAPSED (btv, atv);
2453 mono_profiler_gc_event (MONO_GC_EVENT_MARK_END, 0);
2456 * The (single-threaded) finalization code might have done
2457 * some copying/marking so we can only reset the GC thread's
2458 * worker data here instead of earlier when we joined the
2461 sgen_workers_reset_data ();
2463 if (objects_pinned) {
2464 sgen_optimize_pin_queue (0);
2465 sgen_pinning_setup_section (nursery_section);
2468 /* walk the pin_queue, build up the fragment list of free memory, unmark
2469 * pinned objects as we go, memzero() the empty fragments so they are ready for the
2472 mono_profiler_gc_event (MONO_GC_EVENT_RECLAIM_START, 0);
2473 fragment_total = sgen_build_nursery_fragments (nursery_section, nursery_section->pin_queue_start, nursery_section->pin_queue_num_entries);
2474 if (!fragment_total)
2477 /* Clear TLABs for all threads */
2478 sgen_clear_tlabs ();
2480 mono_profiler_gc_event (MONO_GC_EVENT_RECLAIM_END, 0);
2482 time_minor_fragment_creation += TV_ELAPSED (atv, btv);
2483 SGEN_LOG (2, "Fragment creation: %d usecs, %lu bytes available", TV_ELAPSED (atv, btv), (unsigned long)fragment_total);
2485 if (consistency_check_at_minor_collection)
2486 sgen_check_major_refs ();
2488 major_collector.finish_nursery_collection ();
2490 TV_GETTIME (all_btv);
2491 gc_stats.minor_gc_time_usecs += TV_ELAPSED (all_atv, all_btv);
2494 dump_heap ("minor", stat_minor_gcs - 1, NULL);
2496 /* prepare the pin queue for the next collection */
2497 sgen_finish_pinning ();
2498 if (fin_ready_list || critical_fin_list) {
2499 SGEN_LOG (4, "Finalizer-thread wakeup: ready %d", num_ready_finalizers);
2500 mono_gc_finalize_notify ();
2502 sgen_pin_stats_reset ();
2504 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
2506 if (remset.finish_minor_collection)
2507 remset.finish_minor_collection ();
2509 check_scan_starts ();
2511 binary_protocol_flush_buffers (FALSE);
2513 sgen_memgov_minor_collection_end ();
2515 /*objects are late pinned because of lack of memory, so a major is a good call*/
2516 needs_major = objects_pinned > 0;
2517 current_collection_generation = -1;
2520 MONO_GC_END (GENERATION_NURSERY);
2526 major_do_collection (const char *reason)
2528 LOSObject *bigobj, *prevbo;
2529 TV_DECLARE (all_atv);
2530 TV_DECLARE (all_btv);
2533 /* FIXME: only use these values for the precise scan
2534 * note that to_space pointers should be excluded anyway...
2536 char *heap_start = NULL;
2537 char *heap_end = (char*)-1;
2538 int old_next_pin_slot;
2539 ScanFromRegisteredRootsJobData scrrjd_normal, scrrjd_wbarrier;
2540 ScanThreadDataJobData stdjd;
2541 ScanFinalizerEntriesJobData sfejd_fin_ready, sfejd_critical_fin;
2543 MONO_GC_BEGIN (GENERATION_OLD);
2545 current_collection_generation = GENERATION_OLD;
2546 #ifndef DISABLE_PERFCOUNTERS
2547 mono_perfcounters->gc_collections1++;
2550 current_object_ops = major_collector.major_ops;
2552 reset_pinned_from_failed_allocation ();
2554 sgen_memgov_major_collection_start ();
2556 //count_ref_nonref_objs ();
2557 //consistency_check ();
2559 binary_protocol_collection (stat_major_gcs, GENERATION_OLD);
2560 check_scan_starts ();
2562 sgen_gray_object_queue_init (&gray_queue);
2563 sgen_workers_init_distribute_gray_queue ();
2564 sgen_nursery_alloc_prepare_for_major ();
2567 SGEN_LOG (1, "Start major collection %d", stat_major_gcs);
2569 gc_stats.major_gc_count ++;
2571 /* world must be stopped already */
2572 TV_GETTIME (all_atv);
2575 /* Pinning depends on this */
2576 sgen_clear_nursery_fragments ();
2578 if (whole_heap_check_before_collection)
2579 sgen_check_whole_heap ();
2582 time_major_pre_collection_fragment_clear += TV_ELAPSED (atv, btv);
2584 nursery_section->next_data = sgen_get_nursery_end ();
2585 /* we should also coalesce scanning from sections close to each other
2586 * and deal with pointers outside of the sections later.
2589 if (major_collector.start_major_collection)
2590 major_collector.start_major_collection ();
2593 *major_collector.have_swept = FALSE;
2595 if (xdomain_checks) {
2596 sgen_clear_nursery_fragments ();
2597 check_for_xdomain_refs ();
2600 /* Remsets are not useful for a major collection */
2601 remset.prepare_for_major_collection ();
2603 sgen_process_fin_stage_entries ();
2604 sgen_process_dislink_stage_entries ();
2607 sgen_init_pinning ();
2608 SGEN_LOG (6, "Collecting pinned addresses");
2609 pin_from_roots ((void*)lowest_heap_address, (void*)highest_heap_address, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2610 sgen_optimize_pin_queue (0);
2613 * pin_queue now contains all candidate pointers, sorted and
2614 * uniqued. We must do two passes now to figure out which
2615 * objects are pinned.
2617 * The first is to find within the pin_queue the area for each
2618 * section. This requires that the pin_queue be sorted. We
2619 * also process the LOS objects and pinned chunks here.
2621 * The second, destructive, pass is to reduce the section
2622 * areas to pointers to the actually pinned objects.
2624 SGEN_LOG (6, "Pinning from sections");
2625 /* first pass for the sections */
2626 sgen_find_section_pin_queue_start_end (nursery_section);
2627 major_collector.find_pin_queue_start_ends (WORKERS_DISTRIBUTE_GRAY_QUEUE);
2628 /* identify possible pointers to the insize of large objects */
2629 SGEN_LOG (6, "Pinning from large objects");
2630 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next) {
2632 gboolean profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2633 GCRootReport report;
2635 if (sgen_find_optimized_pin_queue_area (bigobj->data, (char*)bigobj->data + bigobj->size, &dummy)) {
2636 binary_protocol_pin (bigobj->data, (gpointer)LOAD_VTABLE (bigobj->data), safe_object_get_size (((MonoObject*)(bigobj->data))));
2637 if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
2638 MonoVTable *vt = (MonoVTable*)LOAD_VTABLE (bigobj->data);
2639 MONO_GC_OBJ_PINNED ((mword)bigobj->data, sgen_safe_object_get_size ((MonoObject*)bigobj->data), vt->klass->name_space, vt->klass->name, GENERATION_OLD);
2641 pin_object (bigobj->data);
2642 /* FIXME: only enqueue if object has references */
2643 GRAY_OBJECT_ENQUEUE (WORKERS_DISTRIBUTE_GRAY_QUEUE, bigobj->data);
2644 if (G_UNLIKELY (do_pin_stats))
2645 sgen_pin_stats_register_object ((char*) bigobj->data, safe_object_get_size ((MonoObject*) bigobj->data));
2646 SGEN_LOG (6, "Marked large object %p (%s) size: %lu from roots", bigobj->data, safe_name (bigobj->data), (unsigned long)bigobj->size);
2649 add_profile_gc_root (&report, bigobj->data, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2652 notify_gc_roots (&report);
2654 /* second pass for the sections */
2655 sgen_pin_objects_in_section (nursery_section, WORKERS_DISTRIBUTE_GRAY_QUEUE);
2656 major_collector.pin_objects (WORKERS_DISTRIBUTE_GRAY_QUEUE);
2657 old_next_pin_slot = sgen_get_pinned_count ();
2660 time_major_pinning += TV_ELAPSED (atv, btv);
2661 SGEN_LOG (2, "Finding pinned pointers: %d in %d usecs", sgen_get_pinned_count (), TV_ELAPSED (atv, btv));
2662 SGEN_LOG (4, "Start scan with %d pinned objects", sgen_get_pinned_count ());
2664 major_collector.init_to_space ();
2666 #ifdef SGEN_DEBUG_INTERNAL_ALLOC
2667 main_gc_thread = mono_native_thread_self ();
2670 sgen_workers_start_all_workers ();
2671 sgen_workers_start_marking ();
2673 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2674 report_registered_roots ();
2676 time_major_scan_pinned += TV_ELAPSED (btv, atv);
2678 /* registered roots, this includes static fields */
2679 scrrjd_normal.func = current_object_ops.copy_or_mark_object;
2680 scrrjd_normal.heap_start = heap_start;
2681 scrrjd_normal.heap_end = heap_end;
2682 scrrjd_normal.root_type = ROOT_TYPE_NORMAL;
2683 sgen_workers_enqueue_job (job_scan_from_registered_roots, &scrrjd_normal);
2685 scrrjd_wbarrier.func = current_object_ops.copy_or_mark_object;
2686 scrrjd_wbarrier.heap_start = heap_start;
2687 scrrjd_wbarrier.heap_end = heap_end;
2688 scrrjd_wbarrier.root_type = ROOT_TYPE_WBARRIER;
2689 sgen_workers_enqueue_job (job_scan_from_registered_roots, &scrrjd_wbarrier);
2692 time_major_scan_registered_roots += TV_ELAPSED (atv, btv);
2695 stdjd.heap_start = heap_start;
2696 stdjd.heap_end = heap_end;
2697 sgen_workers_enqueue_job (job_scan_thread_data, &stdjd);
2700 time_major_scan_thread_data += TV_ELAPSED (btv, atv);
2703 time_major_scan_alloc_pinned += TV_ELAPSED (atv, btv);
2705 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2706 report_finalizer_roots ();
2708 /* scan the list of objects ready for finalization */
2709 sfejd_fin_ready.list = fin_ready_list;
2710 sgen_workers_enqueue_job (job_scan_finalizer_entries, &sfejd_fin_ready);
2712 sfejd_critical_fin.list = critical_fin_list;
2713 sgen_workers_enqueue_job (job_scan_finalizer_entries, &sfejd_critical_fin);
2716 time_major_scan_finalized += TV_ELAPSED (btv, atv);
2717 SGEN_LOG (2, "Root scan: %d usecs", TV_ELAPSED (btv, atv));
2720 time_major_scan_big_objects += TV_ELAPSED (atv, btv);
2722 if (major_collector.is_parallel) {
2723 while (!sgen_gray_object_queue_is_empty (WORKERS_DISTRIBUTE_GRAY_QUEUE)) {
2724 sgen_workers_distribute_gray_queue_sections ();
2728 sgen_workers_join ();
2730 #ifdef SGEN_DEBUG_INTERNAL_ALLOC
2731 main_gc_thread = NULL;
2734 if (major_collector.is_parallel)
2735 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
2737 /* all the objects in the heap */
2738 finish_gray_stack (heap_start, heap_end, GENERATION_OLD, &gray_queue);
2740 time_major_finish_gray_stack += TV_ELAPSED (btv, atv);
2743 * The (single-threaded) finalization code might have done
2744 * some copying/marking so we can only reset the GC thread's
2745 * worker data here instead of earlier when we joined the
2748 sgen_workers_reset_data ();
2750 if (objects_pinned) {
2751 /*This is slow, but we just OOM'd*/
2752 sgen_pin_queue_clear_discarded_entries (nursery_section, old_next_pin_slot);
2753 sgen_optimize_pin_queue (0);
2754 sgen_find_section_pin_queue_start_end (nursery_section);
2758 reset_heap_boundaries ();
2759 sgen_update_heap_boundaries ((mword)sgen_get_nursery_start (), (mword)sgen_get_nursery_end ());
2761 /* sweep the big objects list */
2763 for (bigobj = los_object_list; bigobj;) {
2764 if (object_is_pinned (bigobj->data)) {
2765 unpin_object (bigobj->data);
2766 sgen_update_heap_boundaries ((mword)bigobj->data, (mword)bigobj->data + bigobj->size);
2769 /* not referenced anywhere, so we can free it */
2771 prevbo->next = bigobj->next;
2773 los_object_list = bigobj->next;
2775 bigobj = bigobj->next;
2776 sgen_los_free_object (to_free);
2780 bigobj = bigobj->next;
2784 time_major_free_bigobjs += TV_ELAPSED (atv, btv);
2789 time_major_los_sweep += TV_ELAPSED (btv, atv);
2791 major_collector.sweep ();
2794 time_major_sweep += TV_ELAPSED (atv, btv);
2796 /* walk the pin_queue, build up the fragment list of free memory, unmark
2797 * pinned objects as we go, memzero() the empty fragments so they are ready for the
2800 if (!sgen_build_nursery_fragments (nursery_section, nursery_section->pin_queue_start, nursery_section->pin_queue_num_entries))
2803 /* Clear TLABs for all threads */
2804 sgen_clear_tlabs ();
2807 time_major_fragment_creation += TV_ELAPSED (btv, atv);
2809 TV_GETTIME (all_btv);
2810 gc_stats.major_gc_time_usecs += TV_ELAPSED (all_atv, all_btv);
2813 dump_heap ("major", stat_major_gcs - 1, reason);
2815 /* prepare the pin queue for the next collection */
2816 sgen_finish_pinning ();
2818 if (fin_ready_list || critical_fin_list) {
2819 SGEN_LOG (4, "Finalizer-thread wakeup: ready %d", num_ready_finalizers);
2820 mono_gc_finalize_notify ();
2822 sgen_pin_stats_reset ();
2824 g_assert (sgen_gray_object_queue_is_empty (&gray_queue));
2826 sgen_memgov_major_collection_end ();
2827 current_collection_generation = -1;
2829 major_collector.finish_major_collection ();
2831 check_scan_starts ();
2833 binary_protocol_flush_buffers (FALSE);
2835 //consistency_check ();
2837 MONO_GC_END (GENERATION_OLD);
2839 return bytes_pinned_from_failed_allocation > 0;
2842 static gboolean major_do_collection (const char *reason);
2845 * Ensure an allocation request for @size will succeed by freeing enough memory.
2847 * LOCKING: The GC lock MUST be held.
2850 sgen_ensure_free_space (size_t size)
2852 int generation_to_collect = -1;
2853 const char *reason = NULL;
2856 if (size > SGEN_MAX_SMALL_OBJ_SIZE) {
2857 if (sgen_need_major_collection (size)) {
2858 reason = "LOS overflow";
2859 generation_to_collect = GENERATION_OLD;
2862 if (degraded_mode) {
2863 if (sgen_need_major_collection (size)) {
2864 reason = "Degraded mode overflow";
2865 generation_to_collect = GENERATION_OLD;
2867 } else if (sgen_need_major_collection (size)) {
2868 reason = "Minor allowance";
2869 generation_to_collect = GENERATION_OLD;
2871 generation_to_collect = GENERATION_NURSERY;
2872 reason = "Nursery full";
2876 if (generation_to_collect == -1)
2878 sgen_perform_collection (size, generation_to_collect, reason);
2882 sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason)
2884 TV_DECLARE (gc_end);
2885 GGTimingInfo infos [2];
2886 int overflow_generation_to_collect = -1;
2887 const char *overflow_reason = NULL;
2889 memset (infos, 0, sizeof (infos));
2890 mono_profiler_gc_event (MONO_GC_EVENT_START, generation_to_collect);
2892 infos [0].generation = generation_to_collect;
2893 infos [0].reason = reason;
2894 infos [0].is_overflow = FALSE;
2895 TV_GETTIME (infos [0].total_time);
2896 infos [1].generation = -1;
2898 sgen_stop_world (generation_to_collect);
2899 //FIXME extract overflow reason
2900 if (generation_to_collect == GENERATION_NURSERY) {
2901 if (collect_nursery ()) {
2902 overflow_generation_to_collect = GENERATION_OLD;
2903 overflow_reason = "Minor overflow";
2906 if (major_do_collection (reason)) {
2907 overflow_generation_to_collect = GENERATION_NURSERY;
2908 overflow_reason = "Excessive pinning";
2912 TV_GETTIME (gc_end);
2913 infos [0].total_time = SGEN_TV_ELAPSED (infos [0].total_time, gc_end);
2916 if (overflow_generation_to_collect != -1) {
2917 mono_profiler_gc_event (MONO_GC_EVENT_START, overflow_generation_to_collect);
2918 infos [1].generation = overflow_generation_to_collect;
2919 infos [1].reason = overflow_reason;
2920 infos [1].is_overflow = TRUE;
2921 infos [1].total_time = gc_end;
2923 if (overflow_generation_to_collect == GENERATION_NURSERY)
2926 major_do_collection (overflow_reason);
2928 TV_GETTIME (gc_end);
2929 infos [1].total_time = SGEN_TV_ELAPSED (infos [1].total_time, gc_end);
2931 /* keep events symmetric */
2932 mono_profiler_gc_event (MONO_GC_EVENT_END, overflow_generation_to_collect);
2935 SGEN_LOG (2, "Heap size: %lu, LOS size: %lu", (unsigned long)mono_gc_get_heap_size (), (unsigned long)los_memory_usage);
2937 /* this also sets the proper pointers for the next allocation */
2938 if (generation_to_collect == GENERATION_NURSERY && !sgen_can_alloc_size (requested_size)) {
2939 /* TypeBuilder and MonoMethod are killing mcs with fragmentation */
2940 SGEN_LOG (1, "nursery collection didn't find enough room for %zd alloc (%d pinned)", requested_size, sgen_get_pinned_count ());
2941 sgen_dump_pin_queue ();
2945 sgen_restart_world (generation_to_collect, infos);
2947 mono_profiler_gc_event (MONO_GC_EVENT_END, generation_to_collect);
2951 * ######################################################################
2952 * ######## Memory allocation from the OS
2953 * ######################################################################
2954 * This section of code deals with getting memory from the OS and
2955 * allocating memory for GC-internal data structures.
2956 * Internal memory can be handled with a freelist for small objects.
2962 G_GNUC_UNUSED static void
2963 report_internal_mem_usage (void)
2965 printf ("Internal memory usage:\n");
2966 sgen_report_internal_mem_usage ();
2967 printf ("Pinned memory usage:\n");
2968 major_collector.report_pinned_memory_usage ();
2972 * ######################################################################
2973 * ######## Finalization support
2974 * ######################################################################
2978 * If the object has been forwarded it means it's still referenced from a root.
2979 * If it is pinned it's still alive as well.
2980 * A LOS object is only alive if we have pinned it.
2981 * Return TRUE if @obj is ready to be finalized.
2983 static inline gboolean
2984 sgen_is_object_alive (void *object)
2986 if (ptr_in_nursery (object))
2987 return sgen_nursery_is_object_alive (object);
2988 /* Oldgen objects can be pinned and forwarded too */
2989 if (SGEN_OBJECT_IS_PINNED (object) || SGEN_OBJECT_IS_FORWARDED (object))
2991 return major_collector.is_object_live (object);
2995 sgen_gc_is_object_ready_for_finalization (void *object)
2997 return !sgen_is_object_alive (object);
3001 has_critical_finalizer (MonoObject *obj)
3005 if (!mono_defaults.critical_finalizer_object)
3008 class = ((MonoVTable*)LOAD_VTABLE (obj))->klass;
3010 return mono_class_has_parent_fast (class, mono_defaults.critical_finalizer_object);
3014 sgen_queue_finalization_entry (MonoObject *obj)
3016 FinalizeReadyEntry *entry = sgen_alloc_internal (INTERNAL_MEM_FINALIZE_READY_ENTRY);
3017 entry->object = obj;
3018 if (has_critical_finalizer (obj)) {
3019 entry->next = critical_fin_list;
3020 critical_fin_list = entry;
3022 entry->next = fin_ready_list;
3023 fin_ready_list = entry;
3028 object_is_reachable (char *object, char *start, char *end)
3030 /*This happens for non nursery objects during minor collections. We just treat all objects as alive.*/
3031 if (object < start || object >= end)
3034 return sgen_is_object_alive (object);
3038 sgen_object_is_live (void *obj)
3040 if (ptr_in_nursery (obj))
3041 return object_is_pinned (obj);
3042 /* FIXME This is semantically wrong! All tenured object are considered alive during a nursery collection. */
3043 if (current_collection_generation == GENERATION_NURSERY)
3045 return major_collector.is_object_live (obj);
3048 /* LOCKING: requires that the GC lock is held */
3050 null_ephemerons_for_domain (MonoDomain *domain)
3052 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
3055 MonoObject *object = (MonoObject*)current->array;
3057 if (object && !object->vtable) {
3058 EphemeronLinkNode *tmp = current;
3061 prev->next = current->next;
3063 ephemeron_list = current->next;
3065 current = current->next;
3066 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
3069 current = current->next;
3074 /* LOCKING: requires that the GC lock is held */
3076 clear_unreachable_ephemerons (CopyOrMarkObjectFunc copy_func, char *start, char *end, GrayQueue *queue)
3078 int was_in_nursery, was_promoted;
3079 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
3081 Ephemeron *cur, *array_end;
3085 char *object = current->array;
3087 if (!object_is_reachable (object, start, end)) {
3088 EphemeronLinkNode *tmp = current;
3090 SGEN_LOG (5, "Dead Ephemeron array at %p", object);
3093 prev->next = current->next;
3095 ephemeron_list = current->next;
3097 current = current->next;
3098 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
3103 was_in_nursery = ptr_in_nursery (object);
3104 copy_func ((void**)&object, queue);
3105 current->array = object;
3107 /*The array was promoted, add global remsets for key/values left behind in nursery.*/
3108 was_promoted = was_in_nursery && !ptr_in_nursery (object);
3110 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", object);
3112 array = (MonoArray*)object;
3113 cur = mono_array_addr (array, Ephemeron, 0);
3114 array_end = cur + mono_array_length_fast (array);
3115 tombstone = (char*)((MonoVTable*)LOAD_VTABLE (object))->domain->ephemeron_tombstone;
3117 for (; cur < array_end; ++cur) {
3118 char *key = (char*)cur->key;
3120 if (!key || key == tombstone)
3123 SGEN_LOG (5, "[%td] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
3124 key, object_is_reachable (key, start, end) ? "reachable" : "unreachable",
3125 cur->value, cur->value && object_is_reachable (cur->value, start, end) ? "reachable" : "unreachable");
3127 if (!object_is_reachable (key, start, end)) {
3128 cur->key = tombstone;
3134 if (ptr_in_nursery (key)) {/*key was not promoted*/
3135 SGEN_LOG (5, "\tAdded remset to key %p", key);
3136 sgen_add_to_global_remset (&cur->key);
3138 if (ptr_in_nursery (cur->value)) {/*value was not promoted*/
3139 SGEN_LOG (5, "\tAdded remset to value %p", cur->value);
3140 sgen_add_to_global_remset (&cur->value);
3145 current = current->next;
3149 /* LOCKING: requires that the GC lock is held */
3151 mark_ephemerons_in_range (CopyOrMarkObjectFunc copy_func, char *start, char *end, GrayQueue *queue)
3153 int nothing_marked = 1;
3154 EphemeronLinkNode *current = ephemeron_list;
3156 Ephemeron *cur, *array_end;
3159 for (current = ephemeron_list; current; current = current->next) {
3160 char *object = current->array;
3161 SGEN_LOG (5, "Ephemeron array at %p", object);
3164 For now we process all ephemerons during all collections.
3165 Ideally we should use remset information to partially scan those
3167 We already emit write barriers for Ephemeron fields, it's
3168 just that we don't process them.
3170 /*if (object < start || object >= end)
3173 /*It has to be alive*/
3174 if (!object_is_reachable (object, start, end)) {
3175 SGEN_LOG (5, "\tnot reachable");
3179 copy_func ((void**)&object, queue);
3181 array = (MonoArray*)object;
3182 cur = mono_array_addr (array, Ephemeron, 0);
3183 array_end = cur + mono_array_length_fast (array);
3184 tombstone = (char*)((MonoVTable*)LOAD_VTABLE (object))->domain->ephemeron_tombstone;
3186 for (; cur < array_end; ++cur) {
3187 char *key = cur->key;
3189 if (!key || key == tombstone)
3192 SGEN_LOG (5, "[%td] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
3193 key, object_is_reachable (key, start, end) ? "reachable" : "unreachable",
3194 cur->value, cur->value && object_is_reachable (cur->value, start, end) ? "reachable" : "unreachable");
3196 if (object_is_reachable (key, start, end)) {
3197 char *value = cur->value;
3199 copy_func ((void**)&cur->key, queue);
3201 if (!object_is_reachable (value, start, end))
3203 copy_func ((void**)&cur->value, queue);
3209 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
3210 return nothing_marked;
3214 mono_gc_invoke_finalizers (void)
3216 FinalizeReadyEntry *entry = NULL;
3217 gboolean entry_is_critical = FALSE;
3220 /* FIXME: batch to reduce lock contention */
3221 while (fin_ready_list || critical_fin_list) {
3225 FinalizeReadyEntry **list = entry_is_critical ? &critical_fin_list : &fin_ready_list;
3227 /* We have finalized entry in the last
3228 interation, now we need to remove it from
3231 *list = entry->next;
3233 FinalizeReadyEntry *e = *list;
3234 while (e->next != entry)
3236 e->next = entry->next;
3238 sgen_free_internal (entry, INTERNAL_MEM_FINALIZE_READY_ENTRY);
3242 /* Now look for the first non-null entry. */
3243 for (entry = fin_ready_list; entry && !entry->object; entry = entry->next)
3246 entry_is_critical = FALSE;
3248 entry_is_critical = TRUE;
3249 for (entry = critical_fin_list; entry && !entry->object; entry = entry->next)
3254 g_assert (entry->object);
3255 num_ready_finalizers--;
3256 obj = entry->object;
3257 entry->object = NULL;
3258 SGEN_LOG (7, "Finalizing object %p (%s)", obj, safe_name (obj));
3266 g_assert (entry->object == NULL);
3268 /* the object is on the stack so it is pinned */
3269 /*g_print ("Calling finalizer for object: %p (%s)\n", entry->object, safe_name (entry->object));*/
3270 mono_gc_run_finalize (obj, NULL);
3277 mono_gc_pending_finalizers (void)
3279 return fin_ready_list || critical_fin_list;
3283 * ######################################################################
3284 * ######## registered roots support
3285 * ######################################################################
3289 * We do not coalesce roots.
3292 mono_gc_register_root_inner (char *start, size_t size, void *descr, int root_type)
3294 RootRecord new_root;
3297 for (i = 0; i < ROOT_TYPE_NUM; ++i) {
3298 RootRecord *root = sgen_hash_table_lookup (&roots_hash [i], start);
3299 /* we allow changing the size and the descriptor (for thread statics etc) */
3301 size_t old_size = root->end_root - start;
3302 root->end_root = start + size;
3303 g_assert (((root->root_desc != 0) && (descr != NULL)) ||
3304 ((root->root_desc == 0) && (descr == NULL)));
3305 root->root_desc = (mword)descr;
3307 roots_size -= old_size;
3313 new_root.end_root = start + size;
3314 new_root.root_desc = (mword)descr;
3316 sgen_hash_table_replace (&roots_hash [root_type], start, &new_root, NULL);
3319 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);
3326 mono_gc_register_root (char *start, size_t size, void *descr)
3328 return mono_gc_register_root_inner (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED);
3332 mono_gc_register_root_wbarrier (char *start, size_t size, void *descr)
3334 return mono_gc_register_root_inner (start, size, descr, ROOT_TYPE_WBARRIER);
3338 mono_gc_deregister_root (char* addr)
3344 for (root_type = 0; root_type < ROOT_TYPE_NUM; ++root_type) {
3345 if (sgen_hash_table_remove (&roots_hash [root_type], addr, &root))
3346 roots_size -= (root.end_root - addr);
3352 * ######################################################################
3353 * ######## Thread handling (stop/start code)
3354 * ######################################################################
3357 unsigned int sgen_global_stop_count = 0;
3360 sgen_fill_thread_info_for_suspend (SgenThreadInfo *info)
3362 if (remset.fill_thread_info_for_suspend)
3363 remset.fill_thread_info_for_suspend (info);
3367 sgen_get_current_collection_generation (void)
3369 return current_collection_generation;
3373 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
3375 gc_callbacks = *callbacks;
3379 mono_gc_get_gc_callbacks ()
3381 return &gc_callbacks;
3384 /* Variables holding start/end nursery so it won't have to be passed at every call */
3385 static void *scan_area_arg_start, *scan_area_arg_end;
3388 mono_gc_conservatively_scan_area (void *start, void *end)
3390 conservatively_pin_objects_from (start, end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
3394 mono_gc_scan_object (void *obj)
3396 UserCopyOrMarkData *data = mono_native_tls_get_value (user_copy_or_mark_key);
3397 current_object_ops.copy_or_mark_object (&obj, data->queue);
3402 * Mark from thread stacks and registers.
3405 scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, GrayQueue *queue)
3407 SgenThreadInfo *info;
3409 scan_area_arg_start = start_nursery;
3410 scan_area_arg_end = end_nursery;
3412 FOREACH_THREAD (info) {
3414 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);
3417 if (info->gc_disabled) {
3418 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);
3422 if (!info->joined_stw) {
3423 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);
3427 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 ());
3428 if (!info->thread_is_dying) {
3429 if (gc_callbacks.thread_mark_func && !conservative_stack_mark) {
3430 UserCopyOrMarkData data = { NULL, queue };
3431 set_user_copy_or_mark_data (&data);
3432 gc_callbacks.thread_mark_func (info->runtime_data, info->stack_start, info->stack_end, precise);
3433 set_user_copy_or_mark_data (NULL);
3434 } else if (!precise) {
3435 conservatively_pin_objects_from (info->stack_start, info->stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
3439 if (!info->thread_is_dying && !precise) {
3441 conservatively_pin_objects_from ((void**)&info->ctx, (void**)&info->ctx + ARCH_NUM_REGS,
3442 start_nursery, end_nursery, PIN_TYPE_STACK);
3444 conservatively_pin_objects_from (&info->regs, &info->regs + ARCH_NUM_REGS,
3445 start_nursery, end_nursery, PIN_TYPE_STACK);
3448 } END_FOREACH_THREAD
3452 ptr_on_stack (void *ptr)
3454 gpointer stack_start = &stack_start;
3455 SgenThreadInfo *info = mono_thread_info_current ();
3457 if (ptr >= stack_start && ptr < (gpointer)info->stack_end)
3463 sgen_thread_register (SgenThreadInfo* info, void *addr)
3465 #ifndef HAVE_KW_THREAD
3466 SgenThreadInfo *__thread_info__ = info;
3470 #ifndef HAVE_KW_THREAD
3471 info->tlab_start = info->tlab_next = info->tlab_temp_end = info->tlab_real_end = NULL;
3473 g_assert (!mono_native_tls_get_value (thread_info_key));
3474 mono_native_tls_set_value (thread_info_key, info);
3476 sgen_thread_info = info;
3479 #if !defined(__MACH__)
3480 info->stop_count = -1;
3484 info->joined_stw = FALSE;
3485 info->doing_handshake = FALSE;
3486 info->thread_is_dying = FALSE;
3487 info->stack_start = NULL;
3488 info->store_remset_buffer_addr = &STORE_REMSET_BUFFER;
3489 info->store_remset_buffer_index_addr = &STORE_REMSET_BUFFER_INDEX;
3490 info->stopped_ip = NULL;
3491 info->stopped_domain = NULL;
3493 memset (&info->ctx, 0, sizeof (MonoContext));
3495 memset (&info->regs, 0, sizeof (info->regs));
3498 sgen_init_tlab_info (info);
3500 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
3502 #ifdef HAVE_KW_THREAD
3503 store_remset_buffer_index_addr = &store_remset_buffer_index;
3506 /* try to get it with attributes first */
3507 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
3511 pthread_attr_t attr;
3512 pthread_getattr_np (pthread_self (), &attr);
3513 pthread_attr_getstack (&attr, &sstart, &size);
3514 info->stack_start_limit = sstart;
3515 info->stack_end = (char*)sstart + size;
3516 pthread_attr_destroy (&attr);
3518 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
3519 info->stack_end = (char*)pthread_get_stackaddr_np (pthread_self ());
3520 info->stack_start_limit = (char*)info->stack_end - pthread_get_stacksize_np (pthread_self ());
3523 /* FIXME: we assume the stack grows down */
3524 gsize stack_bottom = (gsize)addr;
3525 stack_bottom += 4095;
3526 stack_bottom &= ~4095;
3527 info->stack_end = (char*)stack_bottom;
3531 #ifdef HAVE_KW_THREAD
3532 stack_end = info->stack_end;
3535 if (remset.register_thread)
3536 remset.register_thread (info);
3538 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->stack_end);
3540 if (gc_callbacks.thread_attach_func)
3541 info->runtime_data = gc_callbacks.thread_attach_func ();
3548 sgen_wbarrier_cleanup_thread (SgenThreadInfo *p)
3550 if (remset.cleanup_thread)
3551 remset.cleanup_thread (p);
3555 sgen_thread_unregister (SgenThreadInfo *p)
3557 /* If a delegate is passed to native code and invoked on a thread we dont
3558 * know about, the jit will register it with mono_jit_thread_attach, but
3559 * we have no way of knowing when that thread goes away. SGen has a TSD
3560 * so we assume that if the domain is still registered, we can detach
3563 if (mono_domain_get ())
3564 mono_thread_detach (mono_thread_current ());
3566 p->thread_is_dying = TRUE;
3569 There is a race condition between a thread finishing executing and been removed
3570 from the GC thread set.
3571 This happens on posix systems when TLS data is been cleaned-up, libpthread will
3572 set the thread_info slot to NULL before calling the cleanup function. This
3573 opens a window in which the thread is registered but has a NULL TLS.
3575 The suspend signal handler needs TLS data to know where to store thread state
3576 data or otherwise it will simply ignore the thread.
3578 This solution works because the thread doing STW will wait until all threads been
3579 suspended handshake back, so there is no race between the doing_hankshake test
3580 and the suspend_thread call.
3582 This is not required on systems that do synchronous STW as those can deal with
3583 the above race at suspend time.
3585 FIXME: I believe we could avoid this by using mono_thread_info_lookup when
3586 mono_thread_info_current returns NULL. Or fix mono_thread_info_lookup to do so.
3588 #if (defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED) || !defined(HAVE_PTHREAD_KILL)
3591 while (!TRYLOCK_GC) {
3592 if (!sgen_park_current_thread_if_doing_handshake (p))
3598 binary_protocol_thread_unregister ((gpointer)mono_thread_info_get_tid (p));
3599 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)mono_thread_info_get_tid (p));
3601 if (gc_callbacks.thread_detach_func) {
3602 gc_callbacks.thread_detach_func (p->runtime_data);
3603 p->runtime_data = NULL;
3605 sgen_wbarrier_cleanup_thread (p);
3607 mono_threads_unregister_current_thread (p);
3613 sgen_thread_attach (SgenThreadInfo *info)
3616 /*this is odd, can we get attached before the gc is inited?*/
3620 if (gc_callbacks.thread_attach_func && !info->runtime_data)
3621 info->runtime_data = gc_callbacks.thread_attach_func ();
3624 mono_gc_register_thread (void *baseptr)
3626 return mono_thread_info_attach (baseptr) != NULL;
3630 * mono_gc_set_stack_end:
3632 * Set the end of the current threads stack to STACK_END. The stack space between
3633 * STACK_END and the real end of the threads stack will not be scanned during collections.
3636 mono_gc_set_stack_end (void *stack_end)
3638 SgenThreadInfo *info;
3641 info = mono_thread_info_current ();
3643 g_assert (stack_end < info->stack_end);
3644 info->stack_end = stack_end;
3649 #if USE_PTHREAD_INTERCEPT
3653 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
3655 return pthread_create (new_thread, attr, start_routine, arg);
3659 mono_gc_pthread_join (pthread_t thread, void **retval)
3661 return pthread_join (thread, retval);
3665 mono_gc_pthread_detach (pthread_t thread)
3667 return pthread_detach (thread);
3671 mono_gc_pthread_exit (void *retval)
3673 pthread_exit (retval);
3676 #endif /* USE_PTHREAD_INTERCEPT */
3679 * ######################################################################
3680 * ######## Write barriers
3681 * ######################################################################
3685 * Note: the write barriers first do the needed GC work and then do the actual store:
3686 * this way the value is visible to the conservative GC scan after the write barrier
3687 * itself. If a GC interrupts the barrier in the middle, value will be kept alive by
3688 * the conservative scan, otherwise by the remembered set scan.
3691 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
3693 HEAVY_STAT (++stat_wbarrier_set_field);
3694 if (ptr_in_nursery (field_ptr)) {
3695 *(void**)field_ptr = value;
3698 SGEN_LOG (8, "Adding remset at %p", field_ptr);
3700 binary_protocol_wbarrier (field_ptr, value, value->vtable);
3702 remset.wbarrier_set_field (obj, field_ptr, value);
3706 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
3708 HEAVY_STAT (++stat_wbarrier_set_arrayref);
3709 if (ptr_in_nursery (slot_ptr)) {
3710 *(void**)slot_ptr = value;
3713 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
3715 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
3717 remset.wbarrier_set_arrayref (arr, slot_ptr, value);
3721 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
3723 HEAVY_STAT (++stat_wbarrier_arrayref_copy);
3724 /*This check can be done without taking a lock since dest_ptr array is pinned*/
3725 if (ptr_in_nursery (dest_ptr) || count <= 0) {
3726 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
3730 #ifdef SGEN_BINARY_PROTOCOL
3733 for (i = 0; i < count; ++i) {
3734 gpointer dest = (gpointer*)dest_ptr + i;
3735 gpointer obj = *((gpointer*)src_ptr + i);
3737 binary_protocol_wbarrier (dest, obj, (gpointer)LOAD_VTABLE (obj));
3742 remset.wbarrier_arrayref_copy (dest_ptr, src_ptr, count);
3745 static char *found_obj;
3748 find_object_for_ptr_callback (char *obj, size_t size, void *user_data)
3750 char *ptr = user_data;
3752 if (ptr >= obj && ptr < obj + size) {
3753 g_assert (!found_obj);
3758 /* for use in the debugger */
3759 char* find_object_for_ptr (char *ptr);
3761 find_object_for_ptr (char *ptr)
3763 if (ptr >= nursery_section->data && ptr < nursery_section->end_data) {
3765 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
3766 find_object_for_ptr_callback, ptr, TRUE);
3772 sgen_los_iterate_objects (find_object_for_ptr_callback, ptr);
3777 * Very inefficient, but this is debugging code, supposed to
3778 * be called from gdb, so we don't care.
3781 major_collector.iterate_objects (TRUE, TRUE, find_object_for_ptr_callback, ptr);
3786 mono_gc_wbarrier_generic_nostore (gpointer ptr)
3788 HEAVY_STAT (++stat_wbarrier_generic_store);
3790 #ifdef XDOMAIN_CHECKS_IN_WBARRIER
3791 /* FIXME: ptr_in_heap must be called with the GC lock held */
3792 if (xdomain_checks && *(MonoObject**)ptr && ptr_in_heap (ptr)) {
3793 char *start = find_object_for_ptr (ptr);
3794 MonoObject *value = *(MonoObject**)ptr;
3798 MonoObject *obj = (MonoObject*)start;
3799 if (obj->vtable->domain != value->vtable->domain)
3800 g_assert (is_xdomain_ref_allowed (ptr, start, obj->vtable->domain));
3806 if (*(gpointer*)ptr)
3807 binary_protocol_wbarrier (ptr, *(gpointer*)ptr, (gpointer)LOAD_VTABLE (*(gpointer*)ptr));
3809 if (ptr_in_nursery (ptr) || ptr_on_stack (ptr) || !ptr_in_nursery (*(gpointer*)ptr)) {
3810 SGEN_LOG (8, "Skipping remset at %p", ptr);
3814 SGEN_LOG (8, "Adding remset at %p", ptr);
3816 remset.wbarrier_generic_nostore (ptr);
3820 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
3822 SGEN_LOG (8, "Wbarrier store at %p to %p (%s)", ptr, value, value ? safe_name (value) : "null");
3823 *(void**)ptr = value;
3824 if (ptr_in_nursery (value))
3825 mono_gc_wbarrier_generic_nostore (ptr);
3826 sgen_dummy_use (value);
3829 void mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
3831 mword *dest = _dest;
3836 mono_gc_wbarrier_generic_store (dest, (MonoObject*)*src);
3841 size -= SIZEOF_VOID_P;
3846 #ifdef SGEN_BINARY_PROTOCOL
3848 #define HANDLE_PTR(ptr,obj) do { \
3849 gpointer o = *(gpointer*)(ptr); \
3851 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
3852 binary_protocol_wbarrier (d, o, (gpointer) LOAD_VTABLE (o)); \
3857 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
3859 #define SCAN_OBJECT_NOVTABLE
3860 #include "sgen-scan-object.h"
3865 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
3867 HEAVY_STAT (++stat_wbarrier_value_copy);
3868 g_assert (klass->valuetype);
3870 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, klass->gc_descr, klass->name, klass);
3872 if (ptr_in_nursery (dest) || ptr_on_stack (dest) || !SGEN_CLASS_HAS_REFERENCES (klass)) {
3873 size_t element_size = mono_class_value_size (klass, NULL);
3874 size_t size = count * element_size;
3875 mono_gc_memmove (dest, src, size);
3879 #ifdef SGEN_BINARY_PROTOCOL
3881 size_t element_size = mono_class_value_size (klass, NULL);
3883 for (i = 0; i < count; ++i) {
3884 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
3885 (char*)src + i * element_size - sizeof (MonoObject),
3886 (mword) klass->gc_descr);
3891 remset.wbarrier_value_copy (dest, src, count, klass);
3895 * mono_gc_wbarrier_object_copy:
3897 * Write barrier to call when obj is the result of a clone or copy of an object.
3900 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
3904 HEAVY_STAT (++stat_wbarrier_object_copy);
3906 if (ptr_in_nursery (obj) || ptr_on_stack (obj)) {
3907 size = mono_object_class (obj)->instance_size;
3908 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
3909 size - sizeof (MonoObject));
3913 #ifdef SGEN_BINARY_PROTOCOL
3914 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
3917 remset.wbarrier_object_copy (obj, src);
3922 * ######################################################################
3923 * ######## Other mono public interface functions.
3924 * ######################################################################
3927 #define REFS_SIZE 128
3930 MonoGCReferences callback;
3934 MonoObject *refs [REFS_SIZE];
3935 uintptr_t offsets [REFS_SIZE];
3939 #define HANDLE_PTR(ptr,obj) do { \
3941 if (hwi->count == REFS_SIZE) { \
3942 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
3946 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
3947 hwi->refs [hwi->count++] = *(ptr); \
3952 collect_references (HeapWalkInfo *hwi, char *start, size_t size)
3954 #include "sgen-scan-object.h"
3958 walk_references (char *start, size_t size, void *data)
3960 HeapWalkInfo *hwi = data;
3963 collect_references (hwi, start, size);
3964 if (hwi->count || !hwi->called)
3965 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
3969 * mono_gc_walk_heap:
3970 * @flags: flags for future use
3971 * @callback: a function pointer called for each object in the heap
3972 * @data: a user data pointer that is passed to callback
3974 * This function can be used to iterate over all the live objects in the heap:
3975 * for each object, @callback is invoked, providing info about the object's
3976 * location in memory, its class, its size and the objects it references.
3977 * For each referenced object it's offset from the object address is
3978 * reported in the offsets array.
3979 * The object references may be buffered, so the callback may be invoked
3980 * multiple times for the same object: in all but the first call, the size
3981 * argument will be zero.
3982 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
3983 * profiler event handler.
3985 * Returns: a non-zero value if the GC doesn't support heap walking
3988 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
3993 hwi.callback = callback;
3996 sgen_clear_nursery_fragments ();
3997 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE);
3999 major_collector.iterate_objects (TRUE, TRUE, walk_references, &hwi);
4000 sgen_los_iterate_objects (walk_references, &hwi);
4006 mono_gc_collect (int generation)
4011 sgen_perform_collection (0, generation, "user request");
4016 mono_gc_max_generation (void)
4022 mono_gc_collection_count (int generation)
4024 if (generation == 0)
4025 return stat_minor_gcs;
4026 return stat_major_gcs;
4030 mono_gc_get_used_size (void)
4034 tot = los_memory_usage;
4035 tot += nursery_section->next_data - nursery_section->data;
4036 tot += major_collector.get_used_size ();
4037 /* FIXME: account for pinned objects */
4043 mono_gc_disable (void)
4051 mono_gc_enable (void)
4059 mono_gc_get_los_limit (void)
4061 return MAX_SMALL_OBJ_SIZE;
4065 mono_gc_user_markers_supported (void)
4071 mono_object_is_alive (MonoObject* o)
4077 mono_gc_get_generation (MonoObject *obj)
4079 if (ptr_in_nursery (obj))
4085 mono_gc_enable_events (void)
4090 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
4092 sgen_register_disappearing_link (obj, link_addr, track, FALSE);
4096 mono_gc_weak_link_remove (void **link_addr)
4098 sgen_register_disappearing_link (NULL, link_addr, FALSE, FALSE);
4102 mono_gc_weak_link_get (void **link_addr)
4105 * We must only load *link_addr once because it might change
4106 * under our feet, and REVEAL_POINTER (NULL) results in an
4107 * invalid reference.
4109 void *ptr = *link_addr;
4114 * During the second bridge processing step the world is
4115 * running again. That step processes all weak links once
4116 * more to null those that refer to dead objects. Before that
4117 * is completed, those links must not be followed, so we
4118 * conservatively wait for bridge processing when any weak
4119 * link is dereferenced.
4121 if (G_UNLIKELY (bridge_processing_in_progress))
4122 mono_gc_wait_for_bridge_processing ();
4124 return (MonoObject*) REVEAL_POINTER (ptr);
4128 mono_gc_ephemeron_array_add (MonoObject *obj)
4130 EphemeronLinkNode *node;
4134 node = sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
4139 node->array = (char*)obj;
4140 node->next = ephemeron_list;
4141 ephemeron_list = node;
4143 SGEN_LOG (5, "Registered ephemeron array %p", obj);
4150 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
4154 result = func (data);
4155 UNLOCK_INTERRUPTION;
4160 mono_gc_is_gc_thread (void)
4164 result = mono_thread_info_current () != NULL;
4170 is_critical_method (MonoMethod *method)
4172 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
4176 mono_gc_base_init (void)
4178 MonoThreadInfoCallbacks cb;
4181 char *major_collector_opt = NULL;
4182 char *minor_collector_opt = NULL;
4184 glong soft_limit = 0;
4188 gboolean debug_print_allowance = FALSE;
4189 double allowance_ratio = 0, save_target = 0;
4192 result = InterlockedCompareExchange (&gc_initialized, -1, 0);
4195 /* already inited */
4198 /* being inited by another thread */
4202 /* we will init it */
4205 g_assert_not_reached ();
4207 } while (result != 0);
4209 LOCK_INIT (gc_mutex);
4211 pagesize = mono_pagesize ();
4212 gc_debug_file = stderr;
4214 cb.thread_register = sgen_thread_register;
4215 cb.thread_unregister = sgen_thread_unregister;
4216 cb.thread_attach = sgen_thread_attach;
4217 cb.mono_method_is_critical = (gpointer)is_critical_method;
4219 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
4222 mono_threads_init (&cb, sizeof (SgenThreadInfo));
4224 LOCK_INIT (sgen_interruption_mutex);
4225 LOCK_INIT (pin_queue_mutex);
4227 init_user_copy_or_mark_key ();
4229 if ((env = getenv ("MONO_GC_PARAMS"))) {
4230 opts = g_strsplit (env, ",", -1);
4231 for (ptr = opts; *ptr; ++ptr) {
4233 if (g_str_has_prefix (opt, "major=")) {
4234 opt = strchr (opt, '=') + 1;
4235 major_collector_opt = g_strdup (opt);
4236 } else if (g_str_has_prefix (opt, "minor=")) {
4237 opt = strchr (opt, '=') + 1;
4238 minor_collector_opt = g_strdup (opt);
4246 sgen_init_internal_allocator ();
4247 sgen_init_nursery_allocator ();
4249 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_SECTION, SGEN_SIZEOF_GC_MEM_SECTION);
4250 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_FINALIZE_READY_ENTRY, sizeof (FinalizeReadyEntry));
4251 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_GRAY_QUEUE, sizeof (GrayQueueSection));
4252 g_assert (sizeof (GenericStoreRememberedSet) == sizeof (gpointer) * STORE_REMSET_BUFFER_SIZE);
4253 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_STORE_REMSET, sizeof (GenericStoreRememberedSet));
4254 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
4256 #ifndef HAVE_KW_THREAD
4257 mono_native_tls_alloc (&thread_info_key, NULL);
4261 * This needs to happen before any internal allocations because
4262 * it inits the small id which is required for hazard pointer
4267 mono_thread_info_attach (&dummy);
4269 if (!minor_collector_opt) {
4270 sgen_simple_nursery_init (&sgen_minor_collector);
4272 if (!strcmp (minor_collector_opt, "simple"))
4273 sgen_simple_nursery_init (&sgen_minor_collector);
4274 else if (!strcmp (minor_collector_opt, "split"))
4275 sgen_split_nursery_init (&sgen_minor_collector);
4277 fprintf (stderr, "Unknown minor collector `%s'.\n", minor_collector_opt);
4282 if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep")) {
4283 sgen_marksweep_init (&major_collector);
4284 } else if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep-fixed")) {
4285 sgen_marksweep_fixed_init (&major_collector);
4286 } else if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep-par")) {
4287 sgen_marksweep_par_init (&major_collector);
4288 } else if (!major_collector_opt || !strcmp (major_collector_opt, "marksweep-fixed-par")) {
4289 sgen_marksweep_fixed_par_init (&major_collector);
4290 } else if (!strcmp (major_collector_opt, "copying")) {
4291 sgen_copying_init (&major_collector);
4293 fprintf (stderr, "Unknown major collector `%s'.\n", major_collector_opt);
4297 #ifdef SGEN_HAVE_CARDTABLE
4298 use_cardtable = major_collector.supports_cardtable;
4300 use_cardtable = FALSE;
4303 num_workers = mono_cpu_count ();
4304 g_assert (num_workers > 0);
4305 if (num_workers > 16)
4308 ///* Keep this the default for now */
4309 /* Precise marking is broken on all supported targets. Disable until fixed. */
4310 conservative_stack_mark = TRUE;
4312 sgen_nursery_size = DEFAULT_NURSERY_SIZE;
4315 for (ptr = opts; *ptr; ++ptr) {
4317 if (g_str_has_prefix (opt, "major="))
4319 if (g_str_has_prefix (opt, "minor="))
4321 if (g_str_has_prefix (opt, "wbarrier=")) {
4322 opt = strchr (opt, '=') + 1;
4323 if (strcmp (opt, "remset") == 0) {
4324 use_cardtable = FALSE;
4325 } else if (strcmp (opt, "cardtable") == 0) {
4326 if (!use_cardtable) {
4327 if (major_collector.supports_cardtable)
4328 fprintf (stderr, "The cardtable write barrier is not supported on this platform.\n");
4330 fprintf (stderr, "The major collector does not support the cardtable write barrier.\n");
4334 fprintf (stderr, "wbarrier must either be `remset' or `cardtable'.");
4339 if (g_str_has_prefix (opt, "max-heap-size=")) {
4340 opt = strchr (opt, '=') + 1;
4341 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
4342 if ((max_heap & (mono_pagesize () - 1))) {
4343 fprintf (stderr, "max-heap-size size must be a multiple of %d.\n", mono_pagesize ());
4347 fprintf (stderr, "max-heap-size must be an integer.\n");
4352 if (g_str_has_prefix (opt, "soft-heap-limit=")) {
4353 opt = strchr (opt, '=') + 1;
4354 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &soft_limit)) {
4355 if (soft_limit <= 0) {
4356 fprintf (stderr, "soft-heap-limit must be positive.\n");
4360 fprintf (stderr, "soft-heap-limit must be an integer.\n");
4365 if (g_str_has_prefix (opt, "workers=")) {
4368 if (!major_collector.is_parallel) {
4369 fprintf (stderr, "The workers= option can only be used for parallel collectors.");
4372 opt = strchr (opt, '=') + 1;
4373 val = strtol (opt, &endptr, 10);
4374 if (!*opt || *endptr) {
4375 fprintf (stderr, "Cannot parse the workers= option value.");
4378 if (val <= 0 || val > 16) {
4379 fprintf (stderr, "The number of workers must be in the range 1 to 16.");
4382 num_workers = (int)val;
4385 if (g_str_has_prefix (opt, "stack-mark=")) {
4386 opt = strchr (opt, '=') + 1;
4387 if (!strcmp (opt, "precise")) {
4388 conservative_stack_mark = FALSE;
4389 } else if (!strcmp (opt, "conservative")) {
4390 conservative_stack_mark = TRUE;
4392 fprintf (stderr, "Invalid value '%s' for stack-mark= option, possible values are: 'precise', 'conservative'.\n", opt);
4397 if (g_str_has_prefix (opt, "bridge=")) {
4398 opt = strchr (opt, '=') + 1;
4399 sgen_register_test_bridge_callbacks (g_strdup (opt));
4403 if (g_str_has_prefix (opt, "nursery-size=")) {
4405 opt = strchr (opt, '=') + 1;
4406 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &val)) {
4407 sgen_nursery_size = val;
4408 #ifdef SGEN_ALIGN_NURSERY
4409 if ((val & (val - 1))) {
4410 fprintf (stderr, "The nursery size must be a power of two.\n");
4414 if (val < SGEN_MAX_NURSERY_WASTE) {
4415 fprintf (stderr, "The nursery size must be at least %d bytes.\n", SGEN_MAX_NURSERY_WASTE);
4419 sgen_nursery_bits = 0;
4420 while (1 << (++ sgen_nursery_bits) != sgen_nursery_size)
4424 fprintf (stderr, "nursery-size must be an integer.\n");
4430 if (g_str_has_prefix (opt, "save-target-ratio=")) {
4432 opt = strchr (opt, '=') + 1;
4433 save_target = strtod (opt, &endptr);
4434 if (endptr == opt) {
4435 fprintf (stderr, "save-target-ratio must be a number.");
4438 if (save_target < SGEN_MIN_SAVE_TARGET_RATIO || save_target > SGEN_MAX_SAVE_TARGET_RATIO) {
4439 fprintf (stderr, "save-target-ratio must be between %.2f - %.2f.", SGEN_MIN_SAVE_TARGET_RATIO, SGEN_MAX_SAVE_TARGET_RATIO);
4444 if (g_str_has_prefix (opt, "default-allowance-ratio=")) {
4446 opt = strchr (opt, '=') + 1;
4448 allowance_ratio = strtod (opt, &endptr);
4449 if (endptr == opt) {
4450 fprintf (stderr, "save-target-ratio must be a number.");
4453 if (allowance_ratio < SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO || allowance_ratio > SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO) {
4454 fprintf (stderr, "default-allowance-ratio must be between %.2f - %.2f.", SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO, SGEN_MIN_ALLOWANCE_NURSERY_SIZE_RATIO);
4460 if (major_collector.handle_gc_param && major_collector.handle_gc_param (opt))
4463 if (sgen_minor_collector.handle_gc_param && sgen_minor_collector.handle_gc_param (opt))
4466 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
4467 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
4468 fprintf (stderr, " soft-heap-limit=n (where N is an integer, possibly with a k, m or a g suffix)\n");
4469 fprintf (stderr, " nursery-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
4470 fprintf (stderr, " major=COLLECTOR (where COLLECTOR is `marksweep', `marksweep-par', 'marksweep-fixed', 'marksweep-fixed-par' or `copying')\n");
4471 fprintf (stderr, " minor=COLLECTOR (where COLLECTOR is `simple' or `split')\n");
4472 fprintf (stderr, " wbarrier=WBARRIER (where WBARRIER is `remset' or `cardtable')\n");
4473 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
4474 if (major_collector.print_gc_param_usage)
4475 major_collector.print_gc_param_usage ();
4476 if (sgen_minor_collector.print_gc_param_usage)
4477 sgen_minor_collector.print_gc_param_usage ();
4478 fprintf (stderr, " Experimental options:\n");
4479 fprintf (stderr, " save-target-ratio=R (where R must be between %.2f - %.2f).\n", SGEN_MIN_SAVE_TARGET_RATIO, SGEN_MAX_SAVE_TARGET_RATIO);
4480 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);
4486 if (major_collector.is_parallel)
4487 sgen_workers_init (num_workers);
4489 if (major_collector_opt)
4490 g_free (major_collector_opt);
4492 if (minor_collector_opt)
4493 g_free (minor_collector_opt);
4497 if ((env = getenv ("MONO_GC_DEBUG"))) {
4498 opts = g_strsplit (env, ",", -1);
4499 for (ptr = opts; ptr && *ptr; ptr ++) {
4501 if (opt [0] >= '0' && opt [0] <= '9') {
4502 gc_debug_level = atoi (opt);
4508 char *rf = g_strdup_printf ("%s.%d", opt, GetCurrentProcessId ());
4510 char *rf = g_strdup_printf ("%s.%d", opt, getpid ());
4512 gc_debug_file = fopen (rf, "wb");
4514 gc_debug_file = stderr;
4517 } else if (!strcmp (opt, "print-allowance")) {
4518 debug_print_allowance = TRUE;
4519 } else if (!strcmp (opt, "print-pinning")) {
4520 do_pin_stats = TRUE;
4521 } else if (!strcmp (opt, "verify-before-allocs")) {
4522 verify_before_allocs = 1;
4523 has_per_allocation_action = TRUE;
4524 } else if (g_str_has_prefix (opt, "verify-before-allocs=")) {
4525 char *arg = strchr (opt, '=') + 1;
4526 verify_before_allocs = atoi (arg);
4527 has_per_allocation_action = TRUE;
4528 } else if (!strcmp (opt, "collect-before-allocs")) {
4529 collect_before_allocs = 1;
4530 has_per_allocation_action = TRUE;
4531 } else if (g_str_has_prefix (opt, "collect-before-allocs=")) {
4532 char *arg = strchr (opt, '=') + 1;
4533 has_per_allocation_action = TRUE;
4534 collect_before_allocs = atoi (arg);
4535 } else if (!strcmp (opt, "verify-before-collections")) {
4536 whole_heap_check_before_collection = TRUE;
4537 } else if (!strcmp (opt, "check-at-minor-collections")) {
4538 consistency_check_at_minor_collection = TRUE;
4539 nursery_clear_policy = CLEAR_AT_GC;
4540 } else if (!strcmp (opt, "xdomain-checks")) {
4541 xdomain_checks = TRUE;
4542 } else if (!strcmp (opt, "clear-at-gc")) {
4543 nursery_clear_policy = CLEAR_AT_GC;
4544 } else if (!strcmp (opt, "clear-nursery-at-gc")) {
4545 nursery_clear_policy = CLEAR_AT_GC;
4546 } else if (!strcmp (opt, "check-scan-starts")) {
4547 do_scan_starts_check = TRUE;
4548 } else if (!strcmp (opt, "verify-nursery-at-minor-gc")) {
4549 do_verify_nursery = TRUE;
4550 } else if (!strcmp (opt, "dump-nursery-at-minor-gc")) {
4551 do_dump_nursery_content = TRUE;
4552 } else if (!strcmp (opt, "no-managed-allocator")) {
4553 sgen_set_use_managed_allocator (FALSE);
4554 } else if (!strcmp (opt, "disable-minor")) {
4555 disable_minor_collections = TRUE;
4556 } else if (!strcmp (opt, "disable-major")) {
4557 disable_major_collections = TRUE;
4558 } else if (g_str_has_prefix (opt, "heap-dump=")) {
4559 char *filename = strchr (opt, '=') + 1;
4560 nursery_clear_policy = CLEAR_AT_GC;
4561 heap_dump_file = fopen (filename, "w");
4562 if (heap_dump_file) {
4563 fprintf (heap_dump_file, "<sgen-dump>\n");
4564 do_pin_stats = TRUE;
4566 #ifdef SGEN_BINARY_PROTOCOL
4567 } else if (g_str_has_prefix (opt, "binary-protocol=")) {
4568 char *filename = strchr (opt, '=') + 1;
4569 binary_protocol_init (filename);
4571 fprintf (stderr, "Warning: Cardtable write barriers will not be binary-protocolled.\n");
4574 fprintf (stderr, "Invalid format for the MONO_GC_DEBUG env variable: '%s'\n", env);
4575 fprintf (stderr, "The format is: MONO_GC_DEBUG=[l[:filename]|<option>]+ where l is a debug level 0-9.\n");
4576 fprintf (stderr, "Valid options are:\n");
4577 fprintf (stderr, " collect-before-allocs[=<n>]\n");
4578 fprintf (stderr, " verify-before-allocs[=<n>]\n");
4579 fprintf (stderr, " check-at-minor-collections\n");
4580 fprintf (stderr, " verify-before-collections\n");
4581 fprintf (stderr, " verify-nursery-at-minor-gc\n");
4582 fprintf (stderr, " dump-nursery-at-minor-gc\n");
4583 fprintf (stderr, " disable-minor\n");
4584 fprintf (stderr, " disable-major\n");
4585 fprintf (stderr, " xdomain-checks\n");
4586 fprintf (stderr, " clear-at-gc\n");
4587 fprintf (stderr, " clear-nursery-at-gc\n");
4588 fprintf (stderr, " check-scan-starts\n");
4589 fprintf (stderr, " no-managed-allocator\n");
4590 fprintf (stderr, " print-allowance\n");
4591 fprintf (stderr, " print-pinning\n");
4592 fprintf (stderr, " heap-dump=<filename>\n");
4593 #ifdef SGEN_BINARY_PROTOCOL
4594 fprintf (stderr, " binary-protocol=<filename>\n");
4602 if (major_collector.is_parallel) {
4603 if (heap_dump_file) {
4604 fprintf (stderr, "Error: Cannot do heap dump with the parallel collector.\n");
4608 fprintf (stderr, "Error: Cannot gather pinning statistics with the parallel collector.\n");
4613 if (major_collector.post_param_init)
4614 major_collector.post_param_init ();
4616 sgen_memgov_init (max_heap, soft_limit, debug_print_allowance, allowance_ratio, save_target);
4618 memset (&remset, 0, sizeof (remset));
4620 #ifdef SGEN_HAVE_CARDTABLE
4622 sgen_card_table_init (&remset);
4625 sgen_ssb_init (&remset);
4627 if (remset.register_thread)
4628 remset.register_thread (mono_thread_info_current ());
4634 mono_gc_get_gc_name (void)
4639 static MonoMethod *write_barrier_method;
4642 sgen_is_critical_method (MonoMethod *method)
4644 return (method == write_barrier_method || sgen_is_managed_allocator (method));
4648 sgen_has_critical_method (void)
4650 return write_barrier_method || sgen_has_managed_allocator ();
4654 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels)
4656 memset (nursery_check_return_labels, 0, sizeof (int) * 3);
4657 #ifdef SGEN_ALIGN_NURSERY
4658 // if (ptr_in_nursery (ptr)) return;
4660 * Masking out the bits might be faster, but we would have to use 64 bit
4661 * immediates, which might be slower.
4663 mono_mb_emit_ldarg (mb, 0);
4664 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
4665 mono_mb_emit_byte (mb, CEE_SHR_UN);
4666 mono_mb_emit_icon (mb, (mword)sgen_get_nursery_start () >> DEFAULT_NURSERY_BITS);
4667 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
4669 // if (!ptr_in_nursery (*ptr)) return;
4670 mono_mb_emit_ldarg (mb, 0);
4671 mono_mb_emit_byte (mb, CEE_LDIND_I);
4672 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
4673 mono_mb_emit_byte (mb, CEE_SHR_UN);
4674 mono_mb_emit_icon (mb, (mword)sgen_get_nursery_start () >> DEFAULT_NURSERY_BITS);
4675 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
4677 int label_continue1, label_continue2;
4678 int dereferenced_var;
4680 // if (ptr < (sgen_get_nursery_start ())) goto continue;
4681 mono_mb_emit_ldarg (mb, 0);
4682 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_start ());
4683 label_continue_1 = mono_mb_emit_branch (mb, CEE_BLT);
4685 // if (ptr >= sgen_get_nursery_end ())) goto continue;
4686 mono_mb_emit_ldarg (mb, 0);
4687 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_end ());
4688 label_continue_2 = mono_mb_emit_branch (mb, CEE_BGE);
4691 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BR);
4694 mono_mb_patch_branch (mb, label_continue_1);
4695 mono_mb_patch_branch (mb, label_continue_2);
4697 // Dereference and store in local var
4698 dereferenced_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
4699 mono_mb_emit_ldarg (mb, 0);
4700 mono_mb_emit_byte (mb, CEE_LDIND_I);
4701 mono_mb_emit_stloc (mb, dereferenced_var);
4703 // if (*ptr < sgen_get_nursery_start ()) return;
4704 mono_mb_emit_ldloc (mb, dereferenced_var);
4705 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_start ());
4706 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BLT);
4708 // if (*ptr >= sgen_get_nursery_end ()) return;
4709 mono_mb_emit_ldloc (mb, dereferenced_var);
4710 mono_mb_emit_ptr (mb, (gpointer) sgen_get_nursery_end ());
4711 nursery_check_return_labels [2] = mono_mb_emit_branch (mb, CEE_BGE);
4716 mono_gc_get_write_barrier (void)
4719 MonoMethodBuilder *mb;
4720 MonoMethodSignature *sig;
4721 #ifdef MANAGED_WBARRIER
4722 int i, nursery_check_labels [3];
4723 int label_no_wb_3, label_no_wb_4, label_need_wb, label_slow_path;
4724 int buffer_var, buffer_index_var, dummy_var;
4726 #ifdef HAVE_KW_THREAD
4727 int stack_end_offset = -1, store_remset_buffer_offset = -1;
4728 int store_remset_buffer_index_offset = -1, store_remset_buffer_index_addr_offset = -1;
4730 MONO_THREAD_VAR_OFFSET (stack_end, stack_end_offset);
4731 g_assert (stack_end_offset != -1);
4732 MONO_THREAD_VAR_OFFSET (store_remset_buffer, store_remset_buffer_offset);
4733 g_assert (store_remset_buffer_offset != -1);
4734 MONO_THREAD_VAR_OFFSET (store_remset_buffer_index, store_remset_buffer_index_offset);
4735 g_assert (store_remset_buffer_index_offset != -1);
4736 MONO_THREAD_VAR_OFFSET (store_remset_buffer_index_addr, store_remset_buffer_index_addr_offset);
4737 g_assert (store_remset_buffer_index_addr_offset != -1);
4741 // FIXME: Maybe create a separate version for ctors (the branch would be
4742 // correctly predicted more times)
4743 if (write_barrier_method)
4744 return write_barrier_method;
4746 /* Create the IL version of mono_gc_barrier_generic_store () */
4747 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
4748 sig->ret = &mono_defaults.void_class->byval_arg;
4749 sig->params [0] = &mono_defaults.int_class->byval_arg;
4751 mb = mono_mb_new (mono_defaults.object_class, "wbarrier", MONO_WRAPPER_WRITE_BARRIER);
4753 #ifdef MANAGED_WBARRIER
4754 if (use_cardtable) {
4755 emit_nursery_check (mb, nursery_check_labels);
4757 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
4761 LDC_PTR sgen_cardtable
4763 address >> CARD_BITS
4767 if (SGEN_HAVE_OVERLAPPING_CARDS) {
4768 LDC_PTR card_table_mask
4775 mono_mb_emit_ptr (mb, sgen_cardtable);
4776 mono_mb_emit_ldarg (mb, 0);
4777 mono_mb_emit_icon (mb, CARD_BITS);
4778 mono_mb_emit_byte (mb, CEE_SHR_UN);
4779 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
4780 mono_mb_emit_ptr (mb, (gpointer)CARD_MASK);
4781 mono_mb_emit_byte (mb, CEE_AND);
4783 mono_mb_emit_byte (mb, CEE_ADD);
4784 mono_mb_emit_icon (mb, 1);
4785 mono_mb_emit_byte (mb, CEE_STIND_I1);
4788 for (i = 0; i < 3; ++i) {
4789 if (nursery_check_labels [i])
4790 mono_mb_patch_branch (mb, nursery_check_labels [i]);
4792 mono_mb_emit_byte (mb, CEE_RET);
4793 } else if (mono_runtime_has_tls_get ()) {
4794 emit_nursery_check (mb, nursery_check_labels);
4796 // if (ptr >= stack_end) goto need_wb;
4797 mono_mb_emit_ldarg (mb, 0);
4798 EMIT_TLS_ACCESS (mb, stack_end, stack_end_offset);
4799 label_need_wb = mono_mb_emit_branch (mb, CEE_BGE_UN);
4801 // if (ptr >= stack_start) return;
4802 dummy_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
4803 mono_mb_emit_ldarg (mb, 0);
4804 mono_mb_emit_ldloc_addr (mb, dummy_var);
4805 label_no_wb_3 = mono_mb_emit_branch (mb, CEE_BGE_UN);
4808 mono_mb_patch_branch (mb, label_need_wb);
4810 // buffer = STORE_REMSET_BUFFER;
4811 buffer_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
4812 EMIT_TLS_ACCESS (mb, store_remset_buffer, store_remset_buffer_offset);
4813 mono_mb_emit_stloc (mb, buffer_var);
4815 // buffer_index = STORE_REMSET_BUFFER_INDEX;
4816 buffer_index_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
4817 EMIT_TLS_ACCESS (mb, store_remset_buffer_index, store_remset_buffer_index_offset);
4818 mono_mb_emit_stloc (mb, buffer_index_var);
4820 // if (buffer [buffer_index] == ptr) return;
4821 mono_mb_emit_ldloc (mb, buffer_var);
4822 mono_mb_emit_ldloc (mb, buffer_index_var);
4823 g_assert (sizeof (gpointer) == 4 || sizeof (gpointer) == 8);
4824 mono_mb_emit_icon (mb, sizeof (gpointer) == 4 ? 2 : 3);
4825 mono_mb_emit_byte (mb, CEE_SHL);
4826 mono_mb_emit_byte (mb, CEE_ADD);
4827 mono_mb_emit_byte (mb, CEE_LDIND_I);
4828 mono_mb_emit_ldarg (mb, 0);
4829 label_no_wb_4 = mono_mb_emit_branch (mb, CEE_BEQ);
4832 mono_mb_emit_ldloc (mb, buffer_index_var);
4833 mono_mb_emit_icon (mb, 1);
4834 mono_mb_emit_byte (mb, CEE_ADD);
4835 mono_mb_emit_stloc (mb, buffer_index_var);
4837 // if (buffer_index >= STORE_REMSET_BUFFER_SIZE) goto slow_path;
4838 mono_mb_emit_ldloc (mb, buffer_index_var);
4839 mono_mb_emit_icon (mb, STORE_REMSET_BUFFER_SIZE);
4840 label_slow_path = mono_mb_emit_branch (mb, CEE_BGE);
4842 // buffer [buffer_index] = ptr;
4843 mono_mb_emit_ldloc (mb, buffer_var);
4844 mono_mb_emit_ldloc (mb, buffer_index_var);
4845 g_assert (sizeof (gpointer) == 4 || sizeof (gpointer) == 8);
4846 mono_mb_emit_icon (mb, sizeof (gpointer) == 4 ? 2 : 3);
4847 mono_mb_emit_byte (mb, CEE_SHL);
4848 mono_mb_emit_byte (mb, CEE_ADD);
4849 mono_mb_emit_ldarg (mb, 0);
4850 mono_mb_emit_byte (mb, CEE_STIND_I);
4852 // STORE_REMSET_BUFFER_INDEX = buffer_index;
4853 EMIT_TLS_ACCESS (mb, store_remset_buffer_index_addr, store_remset_buffer_index_addr_offset);
4854 mono_mb_emit_ldloc (mb, buffer_index_var);
4855 mono_mb_emit_byte (mb, CEE_STIND_I);
4858 for (i = 0; i < 3; ++i) {
4859 if (nursery_check_labels [i])
4860 mono_mb_patch_branch (mb, nursery_check_labels [i]);
4862 mono_mb_patch_branch (mb, label_no_wb_3);
4863 mono_mb_patch_branch (mb, label_no_wb_4);
4864 mono_mb_emit_byte (mb, CEE_RET);
4867 mono_mb_patch_branch (mb, label_slow_path);
4869 mono_mb_emit_ldarg (mb, 0);
4870 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
4871 mono_mb_emit_byte (mb, CEE_RET);
4875 mono_mb_emit_ldarg (mb, 0);
4876 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
4877 mono_mb_emit_byte (mb, CEE_RET);
4880 res = mono_mb_create_method (mb, sig, 16);
4883 mono_loader_lock ();
4884 if (write_barrier_method) {
4885 /* Already created */
4886 mono_free_method (res);
4888 /* double-checked locking */
4889 mono_memory_barrier ();
4890 write_barrier_method = res;
4892 mono_loader_unlock ();
4894 return write_barrier_method;
4898 mono_gc_get_description (void)
4900 return g_strdup ("sgen");
4904 mono_gc_set_desktop_mode (void)
4909 mono_gc_is_moving (void)
4915 mono_gc_is_disabled (void)
4921 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
4928 sgen_get_nursery_clear_policy (void)
4930 return nursery_clear_policy;
4934 sgen_get_array_fill_vtable (void)
4936 if (!array_fill_vtable) {
4937 static MonoClass klass;
4938 static MonoVTable vtable;
4941 MonoDomain *domain = mono_get_root_domain ();
4944 klass.element_class = mono_defaults.byte_class;
4946 klass.instance_size = sizeof (MonoArray);
4947 klass.sizes.element_size = 1;
4948 klass.name = "array_filler_type";
4950 vtable.klass = &klass;
4952 vtable.gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
4955 array_fill_vtable = &vtable;
4957 return array_fill_vtable;
4967 sgen_gc_unlock (void)
4973 sgen_major_collector_iterate_live_block_ranges (sgen_cardtable_block_callback callback)
4975 major_collector.iterate_live_block_ranges (callback);
4979 sgen_major_collector_scan_card_table (SgenGrayQueue *queue)
4981 major_collector.scan_card_table (queue);
4985 sgen_get_major_collector (void)
4987 return &major_collector;
4990 void mono_gc_set_skip_thread (gboolean skip)
4992 SgenThreadInfo *info = mono_thread_info_current ();
4995 info->gc_disabled = skip;
5000 sgen_get_remset (void)
5006 mono_gc_get_vtable_bits (MonoClass *class)
5008 if (sgen_need_bridge_processing () && sgen_is_bridge_class (class))
5009 return SGEN_GC_BIT_BRIDGE_OBJECT;
5014 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
5021 sgen_check_whole_heap_stw (void)
5023 sgen_stop_world (0);
5024 sgen_clear_nursery_fragments ();
5025 sgen_check_whole_heap ();
5026 sgen_restart_world (0, NULL);
5030 sgen_gc_event_moves (void)
5032 if (moved_objects_idx) {
5033 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
5034 moved_objects_idx = 0;
5038 #endif /* HAVE_SGEN_GC */