2 * boehm-gc.c: GC implementation using either the installed or included Boehm GC.
4 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
5 * Copyright 2004-2011 Novell, Inc (http://www.novell.com)
6 * Copyright 2011-2012 Xamarin, Inc (http://www.xamarin.com)
7 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
14 #define GC_I_HIDE_POINTERS
15 #include <mono/metadata/gc-internals.h>
16 #include <mono/metadata/mono-gc.h>
17 #include <mono/metadata/profiler-private.h>
18 #include <mono/metadata/class-internals.h>
19 #include <mono/metadata/method-builder.h>
20 #include <mono/metadata/opcodes.h>
21 #include <mono/metadata/domain-internals.h>
22 #include <mono/metadata/metadata-internals.h>
23 #include <mono/metadata/marshal.h>
24 #include <mono/metadata/runtime.h>
25 #include <mono/metadata/handle.h>
26 #include <mono/metadata/sgen-toggleref.h>
27 #include <mono/metadata/w32handle.h>
28 #include <mono/utils/atomic.h>
29 #include <mono/utils/mono-logger-internals.h>
30 #include <mono/utils/mono-memory-model.h>
31 #include <mono/utils/mono-time.h>
32 #include <mono/utils/mono-threads.h>
33 #include <mono/utils/dtrace.h>
34 #include <mono/utils/gc_wrapper.h>
35 #include <mono/utils/mono-os-mutex.h>
36 #include <mono/utils/mono-counters.h>
37 #include <mono/utils/mono-compiler.h>
43 #define THREAD_LOCAL_ALLOC 1
44 #include "private/pthread_support.h"
46 #if defined(PLATFORM_MACOSX) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
47 void *pthread_get_stackaddr_np(pthread_t
);
50 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
51 /*Boehm max heap cannot be smaller than 16MB*/
52 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
53 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
55 static gboolean gc_initialized
= FALSE
;
56 static mono_mutex_t mono_gc_lock
;
59 boehm_thread_register (MonoThreadInfo
* info
, void *baseptr
);
61 boehm_thread_unregister (MonoThreadInfo
*p
);
63 boehm_thread_detach (MonoThreadInfo
*p
);
65 register_test_toggleref_callback (void);
67 #define BOEHM_GC_BIT_FINALIZER_AWARE 1
68 static MonoGCFinalizerCallbacks fin_callbacks
;
72 static mono_mutex_t handle_section
;
73 #define lock_handles(handles) mono_os_mutex_lock (&handle_section)
74 #define unlock_handles(handles) mono_os_mutex_unlock (&handle_section)
81 guint slot_hint
: 24; /* starting slot for search in bitmap */
82 /* 2^16 appdomains should be enough for everyone (though I know I'll regret this in 20 years) */
83 /* we alloc this only for weak refs, since we can get the domain directly in the other cases */
87 #define EMPTY_HANDLE_DATA(type) {NULL, NULL, 0, (type), 0, NULL}
89 /* weak and weak-track arrays will be allocated in malloc memory
91 static HandleData gc_handles
[] = {
92 EMPTY_HANDLE_DATA (HANDLE_WEAK
),
93 EMPTY_HANDLE_DATA (HANDLE_WEAK_TRACK
),
94 EMPTY_HANDLE_DATA (HANDLE_NORMAL
),
95 EMPTY_HANDLE_DATA (HANDLE_PINNED
)
99 mono_gc_warning (char *msg
, GC_word arg
)
101 mono_trace (G_LOG_LEVEL_WARNING
, MONO_TRACE_GC
, msg
, (unsigned long)arg
);
104 static void on_gc_notification (GC_EventType event
);
105 static void on_gc_heap_resize (size_t new_size
);
108 mono_gc_base_init (void)
110 MonoThreadInfoCallbacks cb
;
117 mono_counters_init ();
120 mono_w32handle_init ();
124 * Handle the case when we are called from a thread different from the main thread,
126 * FIXME: Move this to libgc where it belongs.
128 * we used to do this only when running on valgrind,
129 * but it happens also in other setups.
131 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK) && !defined(__native_client__)
136 pthread_getattr_np (pthread_self (), &attr
);
137 pthread_attr_getstack (&attr
, &sstart
, &size
);
138 pthread_attr_destroy (&attr
);
139 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
142 * The calculation above doesn't seem to work on ia64, also we need to set
143 * GC_register_stackbottom as well, but don't know how.
146 /* apparently with some linuxthreads implementations sstart can be NULL,
147 * fallback to the more imprecise method (bug# 78096).
150 GC_stackbottom
= (char*)sstart
+ size
;
153 gsize stack_bottom
= (gsize
)&dummy
;
154 stack_bottom
+= 4095;
155 stack_bottom
&= ~4095;
156 GC_stackbottom
= (char*)stack_bottom
;
160 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
161 GC_stackbottom
= (char*)pthread_get_stackaddr_np (pthread_self ());
162 #elif defined(__OpenBSD__)
163 # include <pthread_np.h>
168 rslt
= pthread_stackseg_np(pthread_self(), &ss
);
169 g_assert (rslt
== 0);
171 GC_stackbottom
= (char*)ss
.ss_sp
;
173 #elif defined(__native_client__)
174 /* Do nothing, GC_stackbottom is set correctly in libgc */
178 gsize stack_bottom
= (gsize
)&dummy
;
179 stack_bottom
+= 4095;
180 stack_bottom
&= ~4095;
181 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
182 GC_stackbottom
= (char*)stack_bottom
;
186 #if !defined(PLATFORM_ANDROID)
187 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
191 if ((env
= g_getenv ("MONO_GC_DEBUG"))) {
192 char **opts
= g_strsplit (env
, ",", -1);
193 for (char **ptr
= opts
; ptr
&& *ptr
; ptr
++) {
195 if (!strcmp (opt
, "do-not-finalize")) {
196 mono_do_not_finalize
= 1;
197 } else if (!strcmp (opt
, "log-finalizers")) {
206 GC_set_warn_proc (mono_gc_warning
);
207 GC_finalize_on_demand
= 1;
208 GC_finalizer_notifier
= mono_gc_finalize_notify
;
210 GC_init_gcj_malloc (5, NULL
);
211 GC_allow_register_threads ();
213 if ((env
= g_getenv ("MONO_GC_PARAMS"))) {
214 char **ptr
, **opts
= g_strsplit (env
, ",", -1);
215 for (ptr
= opts
; *ptr
; ++ptr
) {
217 if (g_str_has_prefix (opt
, "max-heap-size=")) {
220 opt
= strchr (opt
, '=') + 1;
221 if (*opt
&& mono_gc_parse_environment_string_extract_number (opt
, &max_heap
)) {
222 if (max_heap
< MIN_BOEHM_MAX_HEAP_SIZE
) {
223 fprintf (stderr
, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB
);
226 GC_set_max_heap_size (max_heap
);
228 fprintf (stderr
, "max-heap-size must be an integer.\n");
232 } else if (g_str_has_prefix (opt
, "toggleref-test")) {
233 register_test_toggleref_callback ();
236 /* Could be a parameter for sgen */
238 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
239 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
247 memset (&cb
, 0, sizeof (cb
));
248 cb
.thread_register
= boehm_thread_register
;
249 cb
.thread_unregister
= boehm_thread_unregister
;
250 cb
.thread_detach
= boehm_thread_detach
;
251 cb
.mono_method_is_critical
= (gboolean (*)(void *))mono_runtime_is_critical_method
;
253 mono_threads_init (&cb
, sizeof (MonoThreadInfo
));
254 mono_os_mutex_init (&mono_gc_lock
);
255 mono_os_mutex_init_recursive (&handle_section
);
257 mono_thread_info_attach (&dummy
);
259 GC_set_on_collection_event (on_gc_notification
);
260 GC_on_heap_resize
= on_gc_heap_resize
;
262 gc_initialized
= TRUE
;
266 mono_gc_base_cleanup (void)
268 GC_finalizer_notifier
= NULL
;
273 * @generation: GC generation identifier
275 * Perform a garbage collection for the given generation, higher numbers
276 * mean usually older objects. Collecting a high-numbered generation
277 * implies collecting also the lower-numbered generations.
278 * The maximum value for @generation can be retrieved with a call to
279 * mono_gc_max_generation(), so this function is usually called as:
281 * mono_gc_collect (mono_gc_max_generation ());
284 mono_gc_collect (int generation
)
286 #ifndef DISABLE_PERFCOUNTERS
287 mono_perfcounters
->gc_induced
++;
293 * mono_gc_max_generation:
295 * Get the maximum generation number used by the current garbage
296 * collector. The value will be 0 for the Boehm collector, 1 or more
297 * for the generational collectors.
299 * Returns: the maximum generation number.
302 mono_gc_max_generation (void)
308 * mono_gc_get_generation:
309 * @object: a managed object
311 * Get the garbage collector's generation that @object belongs to.
312 * Use this has a hint only.
314 * Returns: a garbage collector generation number
317 mono_gc_get_generation (MonoObject
*object
)
323 * mono_gc_collection_count:
324 * @generation: a GC generation number
326 * Get how many times a garbage collection has been performed
327 * for the given @generation number.
329 * Returns: the number of garbage collections
332 mono_gc_collection_count (int generation
)
338 * mono_gc_add_memory_pressure:
339 * @value: amount of bytes
341 * Adjust the garbage collector's view of how many bytes of memory
342 * are indirectly referenced by managed objects (for example unmanaged
343 * memory holding image or other binary data).
344 * This is a hint only to the garbage collector algorithm.
345 * Note that negative amounts of @value will decrease the memory
349 mono_gc_add_memory_pressure (gint64 value
)
354 * mono_gc_get_used_size:
356 * Get the approximate amount of memory used by managed objects.
358 * Returns: the amount of memory used in bytes
361 mono_gc_get_used_size (void)
363 return GC_get_heap_size () - GC_get_free_bytes ();
367 * mono_gc_get_heap_size:
369 * Get the amount of memory used by the garbage collector.
371 * Returns: the size of the heap in bytes
374 mono_gc_get_heap_size (void)
376 return GC_get_heap_size ();
380 mono_gc_is_gc_thread (void)
382 return GC_thread_is_registered ();
386 mono_gc_register_thread (void *baseptr
)
388 return mono_thread_info_attach (baseptr
) != NULL
;
392 boehm_thread_register (MonoThreadInfo
* info
, void *baseptr
)
394 struct GC_stack_base sb
;
397 /* TODO: use GC_get_stack_base instead of baseptr. */
398 sb
.mem_base
= baseptr
;
399 res
= GC_register_my_thread (&sb
);
400 if (res
== GC_UNIMPLEMENTED
)
401 return NULL
; /* Cannot happen with GC v7+. */
403 info
->handle_stack
= mono_handle_stack_alloc ();
409 boehm_thread_unregister (MonoThreadInfo
*p
)
411 MonoNativeThreadId tid
;
413 tid
= mono_thread_info_get_tid (p
);
415 if (p
->runtime_thread
)
416 mono_threads_add_joinable_thread ((gpointer
)tid
);
420 boehm_thread_detach (MonoThreadInfo
*p
)
422 if (mono_thread_internal_current_is_attached ())
423 mono_thread_detach_internal (mono_thread_internal_current ());
427 mono_object_is_alive (MonoObject
* o
)
429 return GC_is_marked ((ptr_t
)o
);
433 mono_gc_walk_heap (int flags
, MonoGCReferences callback
, void *data
)
438 static gint64 gc_start_time
;
441 on_gc_notification (GC_EventType event
)
443 MonoGCEvent e
= (MonoGCEvent
)event
;
446 case MONO_GC_EVENT_PRE_STOP_WORLD
:
447 MONO_GC_WORLD_STOP_BEGIN ();
450 case MONO_GC_EVENT_POST_STOP_WORLD
:
451 MONO_GC_WORLD_STOP_END ();
454 case MONO_GC_EVENT_PRE_START_WORLD
:
455 MONO_GC_WORLD_RESTART_BEGIN (1);
458 case MONO_GC_EVENT_POST_START_WORLD
:
459 MONO_GC_WORLD_RESTART_END (1);
462 case MONO_GC_EVENT_START
:
464 #ifndef DISABLE_PERFCOUNTERS
465 if (mono_perfcounters
)
466 mono_perfcounters
->gc_collections0
++;
468 gc_stats
.major_gc_count
++;
469 gc_start_time
= mono_100ns_ticks ();
472 case MONO_GC_EVENT_END
:
474 #if defined(ENABLE_DTRACE) && defined(__sun__)
475 /* This works around a dtrace -G problem on Solaris.
476 Limit its actual use to when the probe is enabled. */
477 if (MONO_GC_END_ENABLED ())
481 #ifndef DISABLE_PERFCOUNTERS
482 if (mono_perfcounters
) {
483 guint64 heap_size
= GC_get_heap_size ();
484 guint64 used_size
= heap_size
- GC_get_free_bytes ();
485 mono_perfcounters
->gc_total_bytes
= used_size
;
486 mono_perfcounters
->gc_committed_bytes
= heap_size
;
487 mono_perfcounters
->gc_reserved_bytes
= heap_size
;
488 mono_perfcounters
->gc_gen0size
= heap_size
;
491 gc_stats
.major_gc_time
+= mono_100ns_ticks () - gc_start_time
;
492 mono_trace_message (MONO_TRACE_GC
, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time
) / 10);
498 mono_profiler_gc_event (e
, 0);
501 case MONO_GC_EVENT_PRE_STOP_WORLD
:
502 mono_thread_info_suspend_lock ();
503 mono_profiler_gc_event (MONO_GC_EVENT_PRE_STOP_WORLD_LOCKED
, 0);
505 case MONO_GC_EVENT_POST_START_WORLD
:
506 mono_thread_info_suspend_unlock ();
507 mono_profiler_gc_event (MONO_GC_EVENT_POST_START_WORLD_UNLOCKED
, 0);
516 on_gc_heap_resize (size_t new_size
)
518 guint64 heap_size
= GC_get_heap_size ();
519 #ifndef DISABLE_PERFCOUNTERS
520 if (mono_perfcounters
) {
521 mono_perfcounters
->gc_committed_bytes
= heap_size
;
522 mono_perfcounters
->gc_reserved_bytes
= heap_size
;
523 mono_perfcounters
->gc_gen0size
= heap_size
;
526 mono_profiler_gc_heap_resize (new_size
);
530 mono_gc_register_root (char *start
, size_t size
, void *descr
, MonoGCRootSource source
, const char *msg
)
532 /* for some strange reason, they want one extra byte on the end */
533 GC_add_roots (start
, start
+ size
+ 1);
539 mono_gc_register_root_wbarrier (char *start
, size_t size
, MonoGCDescriptor descr
, MonoGCRootSource source
, const char *msg
)
541 return mono_gc_register_root (start
, size
, descr
, source
, msg
);
545 mono_gc_deregister_root (char* addr
)
548 /* FIXME: libgc doesn't define this work win32 for some reason */
549 /* FIXME: No size info */
550 GC_remove_roots (addr
, addr
+ sizeof (gpointer
) + 1);
555 mono_gc_weak_link_add (void **link_addr
, MonoObject
*obj
, gboolean track
)
557 /* libgc requires that we use HIDE_POINTER... */
558 *link_addr
= (void*)HIDE_POINTER (obj
);
560 GC_REGISTER_LONG_LINK (link_addr
, obj
);
562 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr
, obj
);
566 mono_gc_weak_link_remove (void **link_addr
, gboolean track
)
569 GC_unregister_long_link (link_addr
);
571 GC_unregister_disappearing_link (link_addr
);
576 reveal_link (gpointer link_addr
)
578 void **link_a
= (void **)link_addr
;
579 return REVEAL_POINTER (*link_a
);
583 mono_gc_weak_link_get (void **link_addr
)
585 MonoObject
*obj
= (MonoObject
*)GC_call_with_alloc_lock (reveal_link
, link_addr
);
586 if (obj
== (MonoObject
*) -1)
592 mono_gc_make_descr_for_string (gsize
*bitmap
, int numbits
)
594 return mono_gc_make_descr_from_bitmap (bitmap
, numbits
);
598 mono_gc_make_descr_for_object (gsize
*bitmap
, int numbits
, size_t obj_size
)
600 return mono_gc_make_descr_from_bitmap (bitmap
, numbits
);
604 mono_gc_make_descr_for_array (int vector
, gsize
*elem_bitmap
, int numbits
, size_t elem_size
)
606 /* libgc has no usable support for arrays... */
607 return GC_NO_DESCRIPTOR
;
611 mono_gc_make_descr_from_bitmap (gsize
*bitmap
, int numbits
)
613 /* It seems there are issues when the bitmap doesn't fit: play it safe */
615 return GC_NO_DESCRIPTOR
;
617 return (gpointer
)GC_make_descriptor ((GC_bitmap
)bitmap
, numbits
);
621 mono_gc_make_root_descr_all_refs (int numbits
)
627 mono_gc_alloc_fixed (size_t size
, void *descr
, MonoGCRootSource source
, const char *msg
)
629 return GC_MALLOC_UNCOLLECTABLE (size
);
633 mono_gc_free_fixed (void* addr
)
639 mono_gc_alloc_obj (MonoVTable
*vtable
, size_t size
)
643 if (!vtable
->klass
->has_references
) {
644 obj
= (MonoObject
*)GC_MALLOC_ATOMIC (size
);
645 if (G_UNLIKELY (!obj
))
648 obj
->vtable
= vtable
;
649 obj
->synchronisation
= NULL
;
651 memset ((char *) obj
+ sizeof (MonoObject
), 0, size
- sizeof (MonoObject
));
652 } else if (vtable
->gc_descr
!= GC_NO_DESCRIPTOR
) {
653 obj
= (MonoObject
*)GC_GCJ_MALLOC (size
, vtable
);
654 if (G_UNLIKELY (!obj
))
657 obj
= (MonoObject
*)GC_MALLOC (size
);
658 if (G_UNLIKELY (!obj
))
661 obj
->vtable
= vtable
;
664 if (G_UNLIKELY (mono_profiler_events
& MONO_PROFILE_ALLOCATIONS
))
665 mono_profiler_allocation (obj
);
671 mono_gc_alloc_vector (MonoVTable
*vtable
, size_t size
, uintptr_t max_length
)
675 if (!vtable
->klass
->has_references
) {
676 obj
= (MonoArray
*)GC_MALLOC_ATOMIC (size
);
677 if (G_UNLIKELY (!obj
))
680 obj
->obj
.vtable
= vtable
;
681 obj
->obj
.synchronisation
= NULL
;
683 memset ((char *) obj
+ sizeof (MonoObject
), 0, size
- sizeof (MonoObject
));
684 } else if (vtable
->gc_descr
!= GC_NO_DESCRIPTOR
) {
685 obj
= (MonoArray
*)GC_GCJ_MALLOC (size
, vtable
);
686 if (G_UNLIKELY (!obj
))
689 obj
= (MonoArray
*)GC_MALLOC (size
);
690 if (G_UNLIKELY (!obj
))
693 obj
->obj
.vtable
= vtable
;
696 obj
->max_length
= max_length
;
698 if (G_UNLIKELY (mono_profiler_events
& MONO_PROFILE_ALLOCATIONS
))
699 mono_profiler_allocation (&obj
->obj
);
705 mono_gc_alloc_array (MonoVTable
*vtable
, size_t size
, uintptr_t max_length
, uintptr_t bounds_size
)
709 if (!vtable
->klass
->has_references
) {
710 obj
= (MonoArray
*)GC_MALLOC_ATOMIC (size
);
711 if (G_UNLIKELY (!obj
))
714 obj
->obj
.vtable
= vtable
;
715 obj
->obj
.synchronisation
= NULL
;
717 memset ((char *) obj
+ sizeof (MonoObject
), 0, size
- sizeof (MonoObject
));
718 } else if (vtable
->gc_descr
!= GC_NO_DESCRIPTOR
) {
719 obj
= (MonoArray
*)GC_GCJ_MALLOC (size
, vtable
);
720 if (G_UNLIKELY (!obj
))
723 obj
= (MonoArray
*)GC_MALLOC (size
);
724 if (G_UNLIKELY (!obj
))
727 obj
->obj
.vtable
= vtable
;
730 obj
->max_length
= max_length
;
733 obj
->bounds
= (MonoArrayBounds
*) ((char *) obj
+ size
- bounds_size
);
735 if (G_UNLIKELY (mono_profiler_events
& MONO_PROFILE_ALLOCATIONS
))
736 mono_profiler_allocation (&obj
->obj
);
742 mono_gc_alloc_string (MonoVTable
*vtable
, size_t size
, gint32 len
)
744 MonoString
*obj
= (MonoString
*)GC_MALLOC_ATOMIC (size
);
745 if (G_UNLIKELY (!obj
))
748 obj
->object
.vtable
= vtable
;
749 obj
->object
.synchronisation
= NULL
;
751 obj
->chars
[len
] = 0;
753 if (G_UNLIKELY (mono_profiler_events
& MONO_PROFILE_ALLOCATIONS
))
754 mono_profiler_allocation (&obj
->object
);
760 mono_gc_alloc_mature (MonoVTable
*vtable
, size_t size
)
762 return mono_gc_alloc_obj (vtable
, size
);
766 mono_gc_alloc_pinned_obj (MonoVTable
*vtable
, size_t size
)
768 return mono_gc_alloc_obj (vtable
, size
);
772 mono_gc_invoke_finalizers (void)
774 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
775 * the 'mem_freed' variable is not initialized when there are no
776 * objects to finalize, which leads to strange behavior later on.
777 * The check is necessary to work around that bug.
779 if (GC_should_invoke_finalizers ())
780 return GC_invoke_finalizers ();
785 mono_gc_pending_finalizers (void)
787 return GC_should_invoke_finalizers ();
791 mono_gc_wbarrier_set_field (MonoObject
*obj
, gpointer field_ptr
, MonoObject
* value
)
793 *(void**)field_ptr
= value
;
797 mono_gc_wbarrier_set_arrayref (MonoArray
*arr
, gpointer slot_ptr
, MonoObject
* value
)
799 *(void**)slot_ptr
= value
;
803 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr
, gpointer src_ptr
, int count
)
805 mono_gc_memmove_aligned (dest_ptr
, src_ptr
, count
* sizeof (gpointer
));
809 mono_gc_wbarrier_generic_store (gpointer ptr
, MonoObject
* value
)
811 *(void**)ptr
= value
;
815 mono_gc_wbarrier_generic_store_atomic (gpointer ptr
, MonoObject
*value
)
817 InterlockedWritePointer ((volatile gpointer
*)ptr
, value
);
821 mono_gc_wbarrier_generic_nostore (gpointer ptr
)
826 mono_gc_wbarrier_value_copy (gpointer dest
, gpointer src
, int count
, MonoClass
*klass
)
828 mono_gc_memmove_atomic (dest
, src
, count
* mono_class_value_size (klass
, NULL
));
832 mono_gc_wbarrier_object_copy (MonoObject
* obj
, MonoObject
*src
)
834 /* do not copy the sync state */
835 mono_gc_memmove_aligned ((char*)obj
+ sizeof (MonoObject
), (char*)src
+ sizeof (MonoObject
),
836 mono_object_class (obj
)->instance_size
- sizeof (MonoObject
));
840 mono_gc_clear_domain (MonoDomain
*domain
)
845 mono_gc_suspend_finalizers (void)
850 mono_gc_get_suspend_signal (void)
852 return GC_get_suspend_signal ();
856 mono_gc_get_restart_signal (void)
858 return GC_get_thr_restart_signal ();
861 #if defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
862 extern __thread
void* GC_thread_tls
;
863 #include "metadata-internals.h"
869 while (!(v
& (1 << i
)))
876 ATYPE_FREEPTR_FOR_BOX
,
884 create_allocator (int atype
, int tls_key
, gboolean slowpath
)
886 int index_var
, bytes_var
, my_fl_var
, my_entry_var
;
887 guint32 no_freelist_branch
, not_small_enough_branch
= 0;
888 guint32 size_overflow_branch
= 0;
889 MonoMethodBuilder
*mb
;
891 MonoMethodSignature
*csig
;
892 const char *name
= NULL
;
895 g_assert_not_reached ();
897 if (atype
== ATYPE_FREEPTR
) {
898 name
= slowpath
? "SlowAllocPtrfree" : "AllocPtrfree";
899 } else if (atype
== ATYPE_FREEPTR_FOR_BOX
) {
900 name
= slowpath
? "SlowAllocPtrfreeBox" : "AllocPtrfreeBox";
901 } else if (atype
== ATYPE_NORMAL
) {
902 name
= slowpath
? "SlowAlloc" : "Alloc";
903 } else if (atype
== ATYPE_GCJ
) {
904 name
= slowpath
? "SlowAllocGcj" : "AllocGcj";
905 } else if (atype
== ATYPE_STRING
) {
906 name
= slowpath
? "SlowAllocString" : "AllocString";
908 g_assert_not_reached ();
911 csig
= mono_metadata_signature_alloc (mono_defaults
.corlib
, 2);
913 if (atype
== ATYPE_STRING
) {
914 csig
->ret
= &mono_defaults
.string_class
->byval_arg
;
915 csig
->params
[0] = &mono_defaults
.int_class
->byval_arg
;
916 csig
->params
[1] = &mono_defaults
.int32_class
->byval_arg
;
918 csig
->ret
= &mono_defaults
.object_class
->byval_arg
;
919 csig
->params
[0] = &mono_defaults
.int_class
->byval_arg
;
920 csig
->params
[1] = &mono_defaults
.int32_class
->byval_arg
;
923 mb
= mono_mb_new (mono_defaults
.object_class
, name
, MONO_WRAPPER_ALLOC
);
926 goto always_slowpath
;
928 bytes_var
= mono_mb_add_local (mb
, &mono_defaults
.int32_class
->byval_arg
);
929 if (atype
== ATYPE_STRING
) {
930 /* a string alloator method takes the args: (vtable, len) */
931 /* bytes = (offsetof (MonoString, chars) + ((len + 1) * 2)); */
932 mono_mb_emit_ldarg (mb
, 1);
933 mono_mb_emit_icon (mb
, 1);
934 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
935 mono_mb_emit_icon (mb
, 1);
936 mono_mb_emit_byte (mb
, MONO_CEE_SHL
);
937 // sizeof (MonoString) might include padding
938 mono_mb_emit_icon (mb
, G_STRUCT_OFFSET (MonoString
, chars
));
939 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
940 mono_mb_emit_stloc (mb
, bytes_var
);
942 mono_mb_emit_ldarg (mb
, 1);
943 mono_mb_emit_stloc (mb
, bytes_var
);
946 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
947 if (atype
== ATYPE_STRING
) {
949 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
950 mono_mb_emit_ldloc (mb
, bytes_var
);
951 mono_mb_emit_icon (mb
, (NFREELISTS
-1) * GRANULARITY
);
952 not_small_enough_branch
= mono_mb_emit_short_branch (mb
, MONO_CEE_BGT_UN_S
);
953 /* check for overflow */
954 mono_mb_emit_ldloc (mb
, bytes_var
);
955 mono_mb_emit_icon (mb
, sizeof (MonoString
));
956 size_overflow_branch
= mono_mb_emit_short_branch (mb
, MONO_CEE_BLE_UN_S
);
959 /* int index = INDEX_FROM_BYTES(bytes); */
960 index_var
= mono_mb_add_local (mb
, &mono_defaults
.int32_class
->byval_arg
);
962 mono_mb_emit_ldloc (mb
, bytes_var
);
963 mono_mb_emit_icon (mb
, GRANULARITY
- 1);
964 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
965 mono_mb_emit_icon (mb
, shift_amount (GRANULARITY
));
966 mono_mb_emit_byte (mb
, MONO_CEE_SHR_UN
);
967 mono_mb_emit_icon (mb
, shift_amount (sizeof (gpointer
)));
968 mono_mb_emit_byte (mb
, MONO_CEE_SHL
);
969 /* index var is already adjusted into bytes */
970 mono_mb_emit_stloc (mb
, index_var
);
972 my_fl_var
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
973 my_entry_var
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
974 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
975 mono_mb_emit_byte (mb
, MONO_CUSTOM_PREFIX
);
976 mono_mb_emit_byte (mb
, 0x0D); /* CEE_MONO_TLS */
977 mono_mb_emit_i4 (mb
, tls_key
);
978 if (atype
== ATYPE_FREEPTR
|| atype
== ATYPE_FREEPTR_FOR_BOX
|| atype
== ATYPE_STRING
)
979 mono_mb_emit_icon (mb
, G_STRUCT_OFFSET (struct GC_Thread_Rep
, tlfs
)
980 + G_STRUCT_OFFSET (struct thread_local_freelists
,
982 else if (atype
== ATYPE_NORMAL
)
983 mono_mb_emit_icon (mb
, G_STRUCT_OFFSET (struct GC_Thread_Rep
, tlfs
)
984 + G_STRUCT_OFFSET (struct thread_local_freelists
,
986 else if (atype
== ATYPE_GCJ
)
987 mono_mb_emit_icon (mb
, G_STRUCT_OFFSET (struct GC_Thread_Rep
, tlfs
)
988 + G_STRUCT_OFFSET (struct thread_local_freelists
,
991 g_assert_not_reached ();
992 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
993 mono_mb_emit_ldloc (mb
, index_var
);
994 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
995 mono_mb_emit_stloc (mb
, my_fl_var
);
997 /* my_entry = *my_fl; */
998 mono_mb_emit_ldloc (mb
, my_fl_var
);
999 mono_mb_emit_byte (mb
, MONO_CEE_LDIND_I
);
1000 mono_mb_emit_stloc (mb
, my_entry_var
);
1002 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
1003 mono_mb_emit_ldloc (mb
, my_entry_var
);
1004 mono_mb_emit_icon (mb
, HBLKSIZE
);
1005 no_freelist_branch
= mono_mb_emit_short_branch (mb
, MONO_CEE_BLT_UN_S
);
1007 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
1008 mono_mb_emit_ldloc (mb
, my_fl_var
);
1009 mono_mb_emit_ldloc (mb
, my_entry_var
);
1010 mono_mb_emit_byte (mb
, MONO_CEE_LDIND_I
);
1011 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I
);
1013 /* set the vtable and clear the words in the object */
1014 mono_mb_emit_ldloc (mb
, my_entry_var
);
1015 mono_mb_emit_ldarg (mb
, 0);
1016 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I
);
1018 if (atype
== ATYPE_FREEPTR
) {
1019 int start_var
, end_var
, start_loop
;
1020 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
1022 start_var
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
1023 end_var
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
1024 mono_mb_emit_ldloc (mb
, my_entry_var
);
1025 mono_mb_emit_ldloc (mb
, bytes_var
);
1026 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1027 mono_mb_emit_stloc (mb
, end_var
);
1028 mono_mb_emit_ldloc (mb
, my_entry_var
);
1029 mono_mb_emit_icon (mb
, G_STRUCT_OFFSET (MonoObject
, synchronisation
));
1030 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1031 mono_mb_emit_stloc (mb
, start_var
);
1035 * } while (start < end);
1037 start_loop
= mono_mb_get_label (mb
);
1038 mono_mb_emit_ldloc (mb
, start_var
);
1039 mono_mb_emit_icon (mb
, 0);
1040 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I
);
1041 mono_mb_emit_ldloc (mb
, start_var
);
1042 mono_mb_emit_icon (mb
, sizeof (gpointer
));
1043 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1044 mono_mb_emit_stloc (mb
, start_var
);
1046 mono_mb_emit_ldloc (mb
, start_var
);
1047 mono_mb_emit_ldloc (mb
, end_var
);
1048 mono_mb_emit_byte (mb
, MONO_CEE_BLT_UN_S
);
1049 mono_mb_emit_byte (mb
, start_loop
- (mono_mb_get_label (mb
) + 1));
1050 } else if (atype
== ATYPE_FREEPTR_FOR_BOX
|| atype
== ATYPE_STRING
) {
1051 /* need to clear just the sync pointer */
1052 mono_mb_emit_ldloc (mb
, my_entry_var
);
1053 mono_mb_emit_icon (mb
, G_STRUCT_OFFSET (MonoObject
, synchronisation
));
1054 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1055 mono_mb_emit_icon (mb
, 0);
1056 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I
);
1059 if (atype
== ATYPE_STRING
) {
1060 /* need to set length and clear the last char */
1061 /* s->length = len; */
1062 mono_mb_emit_ldloc (mb
, my_entry_var
);
1063 mono_mb_emit_icon (mb
, G_STRUCT_OFFSET (MonoString
, length
));
1064 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1065 mono_mb_emit_ldarg (mb
, 1);
1066 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I4
);
1067 /* s->chars [len] = 0; */
1068 mono_mb_emit_ldloc (mb
, my_entry_var
);
1069 mono_mb_emit_ldloc (mb
, bytes_var
);
1070 mono_mb_emit_icon (mb
, 2);
1071 mono_mb_emit_byte (mb
, MONO_CEE_SUB
);
1072 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1073 mono_mb_emit_icon (mb
, 0);
1074 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I2
);
1077 /* return my_entry; */
1078 mono_mb_emit_ldloc (mb
, my_entry_var
);
1079 mono_mb_emit_byte (mb
, MONO_CEE_RET
);
1081 mono_mb_patch_short_branch (mb
, no_freelist_branch
);
1082 if (not_small_enough_branch
> 0)
1083 mono_mb_patch_short_branch (mb
, not_small_enough_branch
);
1084 if (size_overflow_branch
> 0)
1085 mono_mb_patch_short_branch (mb
, size_overflow_branch
);
1087 /* the slow path: we just call back into the runtime */
1089 if (atype
== ATYPE_STRING
) {
1090 mono_mb_emit_ldarg (mb
, 1);
1091 mono_mb_emit_icall (mb
, ves_icall_string_alloc
);
1093 mono_mb_emit_ldarg (mb
, 0);
1094 mono_mb_emit_icall (mb
, ves_icall_object_new_specific
);
1097 mono_mb_emit_byte (mb
, MONO_CEE_RET
);
1099 info
= mono_wrapper_info_create (mb
, WRAPPER_SUBTYPE_NONE
);
1100 info
->d
.alloc
.gc_name
= "boehm";
1101 info
->d
.alloc
.alloc_type
= atype
;
1102 mb
->init_locals
= FALSE
;
1104 res
= mono_mb_create (mb
, csig
, 8, info
);
1110 static MonoMethod
* alloc_method_cache
[ATYPE_NUM
];
1111 static MonoMethod
* slowpath_alloc_method_cache
[ATYPE_NUM
];
1114 mono_gc_is_critical_method (MonoMethod
*method
)
1118 for (i
= 0; i
< ATYPE_NUM
; ++i
)
1119 if (method
== alloc_method_cache
[i
] || method
== slowpath_alloc_method_cache
[i
])
1126 * If possible, generate a managed method that can quickly allocate objects in class
1127 * @klass. The method will typically have an thread-local inline allocation sequence.
1128 * The signature of the called method is:
1129 * object allocate (MonoVTable *vtable)
1130 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
1132 * The thread local alloc logic is taken from libgc/pthread_support.c.
1136 mono_gc_get_managed_allocator (MonoClass
*klass
, gboolean for_box
, gboolean known_instance_size
)
1141 * Tls implementation changed, we jump to tls native getters/setters.
1142 * Is boehm managed allocator ok with this ? Do we even care ?
1146 if (!SMALL_ENOUGH (klass
->instance_size
))
1148 if (mono_class_has_finalizer (klass
) || mono_class_is_marshalbyref (klass
))
1150 if (mono_profiler_get_events () & (MONO_PROFILE_ALLOCATIONS
| MONO_PROFILE_STATISTICAL
))
1154 if (mono_class_is_open_constructed_type (&klass
->byval_arg
))
1156 if (klass
->byval_arg
.type
== MONO_TYPE_STRING
) {
1157 atype
= ATYPE_STRING
;
1158 } else if (!known_instance_size
) {
1160 } else if (!klass
->has_references
) {
1162 atype
= ATYPE_FREEPTR_FOR_BOX
;
1164 atype
= ATYPE_FREEPTR
;
1168 * disabled because we currently do a runtime choice anyway, to
1169 * deal with multiple appdomains.
1170 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1173 atype = ATYPE_NORMAL;
1176 return mono_gc_get_managed_allocator_by_type (atype
, MANAGED_ALLOCATOR_REGULAR
);
1180 mono_gc_get_managed_array_allocator (MonoClass
*klass
)
1186 * mono_gc_get_managed_allocator_by_type:
1188 * Return a managed allocator method corresponding to allocator type ATYPE.
1191 mono_gc_get_managed_allocator_by_type (int atype
, ManagedAllocatorVariant variant
)
1194 gboolean slowpath
= variant
!= MANAGED_ALLOCATOR_REGULAR
;
1195 MonoMethod
**cache
= slowpath
? slowpath_alloc_method_cache
: alloc_method_cache
;
1199 res
= cache
[atype
];
1203 res
= create_allocator (atype
, -1, slowpath
);
1204 mono_os_mutex_lock (&mono_gc_lock
);
1205 if (cache
[atype
]) {
1206 mono_free_method (res
);
1207 res
= cache
[atype
];
1209 mono_memory_barrier ();
1210 cache
[atype
] = res
;
1212 mono_os_mutex_unlock (&mono_gc_lock
);
1217 mono_gc_get_managed_allocator_types (void)
1223 mono_gc_get_write_barrier (void)
1225 g_assert_not_reached ();
1232 mono_gc_is_critical_method (MonoMethod
*method
)
1238 mono_gc_get_managed_allocator (MonoClass
*klass
, gboolean for_box
, gboolean known_instance_size
)
1244 mono_gc_get_managed_array_allocator (MonoClass
*klass
)
1250 mono_gc_get_managed_allocator_by_type (int atype
, ManagedAllocatorVariant variant
)
1256 mono_gc_get_managed_allocator_types (void)
1262 mono_gc_get_write_barrier (void)
1264 g_assert_not_reached ();
1271 mono_gc_get_specific_write_barrier (gboolean is_concurrent
)
1273 g_assert_not_reached ();
1278 mono_gc_get_aligned_size_for_allocator (int size
)
1284 mono_gc_get_gc_name (void)
1290 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func
, void *data
)
1292 return GC_call_with_alloc_lock (func
, data
);
1296 mono_gc_get_description (void)
1298 return g_strdup (DEFAULT_GC_NAME
);
1302 mono_gc_set_desktop_mode (void)
1308 mono_gc_is_moving (void)
1314 mono_gc_is_disabled (void)
1316 if (GC_dont_gc
|| g_getenv ("GC_DONT_GC"))
1323 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest
, gpointer _src
, int size
, unsigned bitmap
)
1325 g_assert_not_reached ();
1330 mono_gc_get_card_table (int *shift_bits
, gpointer
*card_mask
)
1332 g_assert_not_reached ();
1337 mono_gc_card_table_nursery_check (void)
1339 g_assert_not_reached ();
1344 mono_gc_get_nursery (int *shift_bits
, size_t *size
)
1350 mono_gc_precise_stack_mark_enabled (void)
1356 mono_gc_get_logfile (void)
1362 mono_gc_params_set (const char* options
)
1367 mono_gc_debug_set (const char* options
)
1372 mono_gc_conservatively_scan_area (void *start
, void *end
)
1374 g_assert_not_reached ();
1378 mono_gc_scan_object (void *obj
, void *gc_data
)
1380 g_assert_not_reached ();
1385 mono_gc_get_bitmap_for_descr (void *descr
, int *numbits
)
1387 g_assert_not_reached ();
1392 mono_gc_set_gc_callbacks (MonoGCCallbacks
*callbacks
)
1397 mono_gc_set_stack_end (void *stack_end
)
1401 void mono_gc_set_skip_thread (gboolean value
)
1406 mono_gc_register_for_finalization (MonoObject
*obj
, void *user_data
)
1411 /* This assertion is not valid when GC_DEBUG is defined */
1412 g_assert (GC_base (obj
) == (char*)obj
- offset
);
1415 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj
- offset
, (GC_finalization_proc
)user_data
, GUINT_TO_POINTER (offset
), NULL
, NULL
);
1420 mono_gc_pthread_create (pthread_t
*new_thread
, const pthread_attr_t
*attr
, void *(*start_routine
)(void *), void *arg
)
1422 /* it is being replaced by GC_pthread_create on some
1423 * platforms, see libgc/include/gc_pthread_redirects.h */
1424 return pthread_create (new_thread
, attr
, start_routine
, arg
);
1429 BOOL APIENTRY
mono_gc_dllmain (HMODULE module_handle
, DWORD reason
, LPVOID reserved
)
1431 return GC_DllMain (module_handle
, reason
, reserved
);
1436 mono_gc_get_vtable_bits (MonoClass
*klass
)
1438 if (fin_callbacks
.is_class_finalization_aware
) {
1439 if (fin_callbacks
.is_class_finalization_aware (klass
))
1440 return BOEHM_GC_BIT_FINALIZER_AWARE
;
1446 * mono_gc_register_altstack:
1448 * Register the dimensions of the normal stack and altstack with the collector.
1449 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1452 mono_gc_register_altstack (gpointer stack
, gint32 stack_size
, gpointer altstack
, gint32 altstack_size
)
1454 GC_register_altstack (stack
, stack_size
, altstack
, altstack_size
);
1458 mono_gc_get_los_limit (void)
1464 mono_gc_set_string_length (MonoString
*str
, gint32 new_length
)
1466 mono_unichar2
*new_end
= str
->chars
+ new_length
;
1468 /* zero the discarded string. This null-delimits the string and allows
1469 * the space to be reclaimed by SGen. */
1471 memset (new_end
, 0, (str
->length
- new_length
+ 1) * sizeof (mono_unichar2
));
1472 str
->length
= new_length
;
1476 mono_gc_user_markers_supported (void)
1482 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker
)
1484 g_assert_not_reached ();
1488 /* Toggleref support */
1491 mono_gc_toggleref_add (MonoObject
*object
, mono_bool strong_ref
)
1493 if (GC_toggleref_add ((GC_PTR
)object
, (int)strong_ref
) != GC_SUCCESS
)
1494 g_error ("GC_toggleref_add failed\n");
1498 mono_gc_toggleref_register_callback (MonoToggleRefStatus (*proccess_toggleref
) (MonoObject
*obj
))
1500 GC_set_toggleref_func ((GC_ToggleRefStatus (*) (GC_PTR obj
)) proccess_toggleref
);
1503 /* Test support code */
1505 static MonoToggleRefStatus
1506 test_toggleref_callback (MonoObject
*obj
)
1508 static MonoClassField
*mono_toggleref_test_field
;
1509 MonoToggleRefStatus status
= MONO_TOGGLE_REF_DROP
;
1511 if (!mono_toggleref_test_field
) {
1512 mono_toggleref_test_field
= mono_class_get_field_from_name (mono_object_get_class (obj
), "__test");
1513 g_assert (mono_toggleref_test_field
);
1516 mono_field_get_value (obj
, mono_toggleref_test_field
, &status
);
1517 printf ("toggleref-cb obj %d\n", status
);
1522 register_test_toggleref_callback (void)
1524 mono_gc_toggleref_register_callback (test_toggleref_callback
);
1528 is_finalization_aware (MonoObject
*obj
)
1530 MonoVTable
*vt
= obj
->vtable
;
1531 return (vt
->gc_bits
& BOEHM_GC_BIT_FINALIZER_AWARE
) == BOEHM_GC_BIT_FINALIZER_AWARE
;
1535 fin_notifier (MonoObject
*obj
)
1537 if (is_finalization_aware (obj
))
1538 fin_callbacks
.object_queued_for_finalization (obj
);
1542 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks
*callbacks
)
1544 if (callbacks
->version
!= MONO_GC_FINALIZER_EXTENSION_VERSION
)
1545 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION
, callbacks
->version
);
1547 fin_callbacks
= *callbacks
;
1549 GC_set_await_finalize_proc ((void (*) (GC_PTR
))fin_notifier
);
1552 #define BITMAP_SIZE (sizeof (*((HandleData *)NULL)->bitmap) * CHAR_BIT)
1554 static inline gboolean
1555 slot_occupied (HandleData
*handles
, guint slot
) {
1556 return handles
->bitmap
[slot
/ BITMAP_SIZE
] & (1 << (slot
% BITMAP_SIZE
));
1560 vacate_slot (HandleData
*handles
, guint slot
) {
1561 handles
->bitmap
[slot
/ BITMAP_SIZE
] &= ~(1 << (slot
% BITMAP_SIZE
));
1565 occupy_slot (HandleData
*handles
, guint slot
) {
1566 handles
->bitmap
[slot
/ BITMAP_SIZE
] |= 1 << (slot
% BITMAP_SIZE
);
1570 find_first_unset (guint32 bitmap
)
1573 for (i
= 0; i
< 32; ++i
) {
1574 if (!(bitmap
& (1 << i
)))
1581 handle_data_alloc_entries (HandleData
*handles
)
1584 if (MONO_GC_HANDLE_TYPE_IS_WEAK (handles
->type
)) {
1585 handles
->entries
= (void **)g_malloc0 (sizeof (*handles
->entries
) * handles
->size
);
1586 handles
->domain_ids
= (guint16
*)g_malloc0 (sizeof (*handles
->domain_ids
) * handles
->size
);
1588 handles
->entries
= (void **)mono_gc_alloc_fixed (sizeof (*handles
->entries
) * handles
->size
, NULL
, MONO_ROOT_SOURCE_GC_HANDLE
, "gc handles table");
1590 handles
->bitmap
= (guint32
*)g_malloc0 (handles
->size
/ CHAR_BIT
);
1594 handle_data_next_unset (HandleData
*handles
)
1597 for (slot
= handles
->slot_hint
; slot
< handles
->size
/ BITMAP_SIZE
; ++slot
) {
1598 if (handles
->bitmap
[slot
] == 0xffffffff)
1600 handles
->slot_hint
= slot
;
1601 return find_first_unset (handles
->bitmap
[slot
]);
1607 handle_data_first_unset (HandleData
*handles
)
1610 for (slot
= 0; slot
< handles
->slot_hint
; ++slot
) {
1611 if (handles
->bitmap
[slot
] == 0xffffffff)
1613 handles
->slot_hint
= slot
;
1614 return find_first_unset (handles
->bitmap
[slot
]);
1619 /* Returns the index of the current slot in the bitmap. */
1621 handle_data_grow (HandleData
*handles
, gboolean track
)
1623 guint32
*new_bitmap
;
1624 guint32 new_size
= handles
->size
* 2; /* always double: we memset to 0 based on this below */
1626 /* resize and copy the bitmap */
1627 new_bitmap
= (guint32
*)g_malloc0 (new_size
/ CHAR_BIT
);
1628 memcpy (new_bitmap
, handles
->bitmap
, handles
->size
/ CHAR_BIT
);
1629 g_free (handles
->bitmap
);
1630 handles
->bitmap
= new_bitmap
;
1632 /* resize and copy the entries */
1633 if (MONO_GC_HANDLE_TYPE_IS_WEAK (handles
->type
)) {
1635 guint16
*domain_ids
;
1637 domain_ids
= (guint16
*)g_malloc0 (sizeof (*handles
->domain_ids
) * new_size
);
1638 entries
= (void **)g_malloc0 (sizeof (*handles
->entries
) * new_size
);
1639 memcpy (domain_ids
, handles
->domain_ids
, sizeof (*handles
->domain_ids
) * handles
->size
);
1640 for (i
= 0; i
< handles
->size
; ++i
) {
1641 MonoObject
*obj
= mono_gc_weak_link_get (&(handles
->entries
[i
]));
1643 mono_gc_weak_link_add (&(entries
[i
]), obj
, track
);
1644 mono_gc_weak_link_remove (&(handles
->entries
[i
]), track
);
1646 g_assert (!handles
->entries
[i
]);
1649 g_free (handles
->entries
);
1650 g_free (handles
->domain_ids
);
1651 handles
->entries
= entries
;
1652 handles
->domain_ids
= domain_ids
;
1655 entries
= (void **)mono_gc_alloc_fixed (sizeof (*handles
->entries
) * new_size
, NULL
, MONO_ROOT_SOURCE_GC_HANDLE
, "gc handles table");
1656 mono_gc_memmove_aligned (entries
, handles
->entries
, sizeof (*handles
->entries
) * handles
->size
);
1657 mono_gc_free_fixed (handles
->entries
);
1658 handles
->entries
= entries
;
1660 handles
->slot_hint
= handles
->size
/ BITMAP_SIZE
;
1661 handles
->size
= new_size
;
1665 alloc_handle (HandleData
*handles
, MonoObject
*obj
, gboolean track
)
1669 lock_handles (handles
);
1671 handle_data_alloc_entries (handles
);
1672 i
= handle_data_next_unset (handles
);
1673 if (i
== -1 && handles
->slot_hint
!= 0)
1674 i
= handle_data_first_unset (handles
);
1676 handle_data_grow (handles
, track
);
1679 slot
= handles
->slot_hint
* BITMAP_SIZE
+ i
;
1680 occupy_slot (handles
, slot
);
1681 handles
->entries
[slot
] = NULL
;
1682 if (MONO_GC_HANDLE_TYPE_IS_WEAK (handles
->type
)) {
1683 /*FIXME, what to use when obj == null?*/
1684 handles
->domain_ids
[slot
] = (obj
? mono_object_get_domain (obj
) : mono_domain_get ())->domain_id
;
1686 mono_gc_weak_link_add (&(handles
->entries
[slot
]), obj
, track
);
1688 handles
->entries
[slot
] = obj
;
1691 #ifndef DISABLE_PERFCOUNTERS
1692 mono_perfcounters
->gc_num_handles
++;
1694 unlock_handles (handles
);
1695 res
= MONO_GC_HANDLE (slot
, handles
->type
);
1696 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED
, handles
->type
, res
, obj
);
1701 * mono_gchandle_new:
1702 * @obj: managed object to get a handle for
1703 * @pinned: whether the object should be pinned
1705 * This returns a handle that wraps the object, this is used to keep a
1706 * reference to a managed object from the unmanaged world and preventing the
1707 * object from being disposed.
1709 * If @pinned is false the address of the object can not be obtained, if it is
1710 * true the address of the object can be obtained. This will also pin the
1711 * object so it will not be possible by a moving garbage collector to move the
1714 * Returns: a handle that can be used to access the object from
1718 mono_gchandle_new (MonoObject
*obj
, gboolean pinned
)
1720 return alloc_handle (&gc_handles
[pinned
? HANDLE_PINNED
: HANDLE_NORMAL
], obj
, FALSE
);
1724 * mono_gchandle_new_weakref:
1725 * @obj: managed object to get a handle for
1726 * @track_resurrection: Determines how long to track the object, if this is set to TRUE, the object is tracked after finalization, if FALSE, the object is only tracked up until the point of finalization.
1728 * This returns a weak handle that wraps the object, this is used to
1729 * keep a reference to a managed object from the unmanaged world.
1730 * Unlike the mono_gchandle_new the object can be reclaimed by the
1731 * garbage collector. In this case the value of the GCHandle will be
1734 * If @track_resurrection is TRUE the object will be tracked through
1735 * finalization and if the object is resurrected during the execution
1736 * of the finalizer, then the returned weakref will continue to hold
1737 * a reference to the object. If @track_resurrection is FALSE, then
1738 * the weak reference's target will become NULL as soon as the object
1739 * is passed on to the finalizer.
1741 * Returns: a handle that can be used to access the object from
1745 mono_gchandle_new_weakref (MonoObject
*obj
, gboolean track_resurrection
)
1747 return alloc_handle (&gc_handles
[track_resurrection
? HANDLE_WEAK_TRACK
: HANDLE_WEAK
], obj
, track_resurrection
);
1751 * mono_gchandle_get_target:
1752 * @gchandle: a GCHandle's handle.
1754 * The handle was previously created by calling `mono_gchandle_new` or
1755 * `mono_gchandle_new_weakref`.
1757 * Returns: A pointer to the `MonoObject*` represented by the handle or
1758 * NULL for a collected object if using a weakref handle.
1761 mono_gchandle_get_target (guint32 gchandle
)
1763 guint slot
= MONO_GC_HANDLE_SLOT (gchandle
);
1764 guint type
= MONO_GC_HANDLE_TYPE (gchandle
);
1765 HandleData
*handles
= &gc_handles
[type
];
1766 MonoObject
*obj
= NULL
;
1767 if (type
>= HANDLE_TYPE_MAX
)
1770 lock_handles (handles
);
1771 if (slot
< handles
->size
&& slot_occupied (handles
, slot
)) {
1772 if (MONO_GC_HANDLE_TYPE_IS_WEAK (handles
->type
)) {
1773 obj
= mono_gc_weak_link_get (&handles
->entries
[slot
]);
1775 obj
= (MonoObject
*)handles
->entries
[slot
];
1778 /* print a warning? */
1780 unlock_handles (handles
);
1781 /*g_print ("get target of entry %d of type %d: %p\n", slot, handles->type, obj);*/
1786 mono_gchandle_set_target (guint32 gchandle
, MonoObject
*obj
)
1788 guint slot
= MONO_GC_HANDLE_SLOT (gchandle
);
1789 guint type
= MONO_GC_HANDLE_TYPE (gchandle
);
1790 HandleData
*handles
= &gc_handles
[type
];
1791 MonoObject
*old_obj
= NULL
;
1793 g_assert (type
< HANDLE_TYPE_MAX
);
1794 lock_handles (handles
);
1795 if (slot
< handles
->size
&& slot_occupied (handles
, slot
)) {
1796 if (MONO_GC_HANDLE_TYPE_IS_WEAK (handles
->type
)) {
1797 old_obj
= (MonoObject
*)handles
->entries
[slot
];
1798 if (handles
->entries
[slot
])
1799 mono_gc_weak_link_remove (&handles
->entries
[slot
], handles
->type
== HANDLE_WEAK_TRACK
);
1801 mono_gc_weak_link_add (&handles
->entries
[slot
], obj
, handles
->type
== HANDLE_WEAK_TRACK
);
1802 /*FIXME, what to use when obj == null?*/
1803 handles
->domain_ids
[slot
] = (obj
? mono_object_get_domain (obj
) : mono_domain_get ())->domain_id
;
1805 handles
->entries
[slot
] = obj
;
1808 /* print a warning? */
1810 /*g_print ("changed entry %d of type %d to object %p (in slot: %p)\n", slot, handles->type, obj, handles->entries [slot]);*/
1811 unlock_handles (handles
);
1815 mono_gc_is_null (void)
1821 * mono_gchandle_is_in_domain:
1822 * @gchandle: a GCHandle's handle.
1823 * @domain: An application domain.
1825 * Use this function to determine if the @gchandle points to an
1826 * object allocated in the specified @domain.
1828 * Returns: TRUE if the object wrapped by the @gchandle belongs to the specific @domain.
1831 mono_gchandle_is_in_domain (guint32 gchandle
, MonoDomain
*domain
)
1833 guint slot
= MONO_GC_HANDLE_SLOT (gchandle
);
1834 guint type
= MONO_GC_HANDLE_TYPE (gchandle
);
1835 HandleData
*handles
= &gc_handles
[type
];
1836 gboolean result
= FALSE
;
1838 if (type
>= HANDLE_TYPE_MAX
)
1841 lock_handles (handles
);
1842 if (slot
< handles
->size
&& slot_occupied (handles
, slot
)) {
1843 if (MONO_GC_HANDLE_TYPE_IS_WEAK (handles
->type
)) {
1844 result
= domain
->domain_id
== handles
->domain_ids
[slot
];
1847 obj
= (MonoObject
*)handles
->entries
[slot
];
1851 result
= domain
== mono_object_domain (obj
);
1854 /* print a warning? */
1856 unlock_handles (handles
);
1861 * mono_gchandle_free:
1862 * @gchandle: a GCHandle's handle.
1864 * Frees the @gchandle handle. If there are no outstanding
1865 * references, the garbage collector can reclaim the memory of the
1869 mono_gchandle_free (guint32 gchandle
)
1871 guint slot
= MONO_GC_HANDLE_SLOT (gchandle
);
1872 guint type
= MONO_GC_HANDLE_TYPE (gchandle
);
1873 HandleData
*handles
= &gc_handles
[type
];
1874 if (type
>= HANDLE_TYPE_MAX
)
1877 lock_handles (handles
);
1878 if (slot
< handles
->size
&& slot_occupied (handles
, slot
)) {
1879 if (MONO_GC_HANDLE_TYPE_IS_WEAK (handles
->type
)) {
1880 if (handles
->entries
[slot
])
1881 mono_gc_weak_link_remove (&handles
->entries
[slot
], handles
->type
== HANDLE_WEAK_TRACK
);
1883 handles
->entries
[slot
] = NULL
;
1885 vacate_slot (handles
, slot
);
1887 /* print a warning? */
1889 #ifndef DISABLE_PERFCOUNTERS
1890 mono_perfcounters
->gc_num_handles
--;
1892 /*g_print ("freed entry %d of type %d\n", slot, handles->type);*/
1893 unlock_handles (handles
);
1894 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED
, handles
->type
, gchandle
, NULL
);
1898 * mono_gchandle_free_domain:
1899 * @domain: domain that is unloading
1901 * Function used internally to cleanup any GC handle for objects belonging
1902 * to the specified domain during appdomain unload.
1905 mono_gchandle_free_domain (MonoDomain
*domain
)
1909 for (type
= HANDLE_TYPE_MIN
; type
< HANDLE_PINNED
; ++type
) {
1911 HandleData
*handles
= &gc_handles
[type
];
1912 lock_handles (handles
);
1913 for (slot
= 0; slot
< handles
->size
; ++slot
) {
1914 if (!slot_occupied (handles
, slot
))
1916 if (MONO_GC_HANDLE_TYPE_IS_WEAK (type
)) {
1917 if (domain
->domain_id
== handles
->domain_ids
[slot
]) {
1918 vacate_slot (handles
, slot
);
1919 if (handles
->entries
[slot
])
1920 mono_gc_weak_link_remove (&handles
->entries
[slot
], handles
->type
== HANDLE_WEAK_TRACK
);
1923 if (handles
->entries
[slot
] && mono_object_domain (handles
->entries
[slot
]) == domain
) {
1924 vacate_slot (handles
, slot
);
1925 handles
->entries
[slot
] = NULL
;
1929 unlock_handles (handles
);
1935 MONO_EMPTY_SOURCE_FILE (boehm_gc
);
1936 #endif /* no Boehm GC */