2 * metadata/gc-internal.h: Internal GC interface
4 * Author: Paolo Molaro <lupus@ximian.com>
6 * (C) 2002 Ximian, Inc.
7 * Copyright 2012 Xamarin Inc (http://www.xamarin.com)
10 #ifndef __MONO_METADATA_GC_INTERNAL_H__
11 #define __MONO_METADATA_GC_INTERNAL_H__
14 #include <mono/utils/gc_wrapper.h>
15 #include <mono/metadata/object-internals.h>
16 #include <mono/metadata/threads-types.h>
17 #include <mono/sgen/gc-internal-agnostic.h>
18 #include <mono/utils/gc_wrapper.h>
20 #define mono_domain_finalizers_lock(domain) mono_mutex_lock (&(domain)->finalizable_objects_hash_lock);
21 #define mono_domain_finalizers_unlock(domain) mono_mutex_unlock (&(domain)->finalizable_objects_hash_lock);
23 /* Register a memory area as a conservatively scanned GC root */
24 #define MONO_GC_REGISTER_ROOT_PINNING(x,src,msg) mono_gc_register_root ((char*)&(x), sizeof(x), MONO_GC_DESCRIPTOR_NULL, (src), (msg))
26 #define MONO_GC_UNREGISTER_ROOT(x) mono_gc_deregister_root ((char*)&(x))
29 * Register a memory location as a root pointing to memory allocated using
30 * mono_gc_alloc_fixed (). This includes MonoGHashTable.
32 /* The result of alloc_fixed () is not GC tracked memory */
33 #define MONO_GC_REGISTER_ROOT_FIXED(x,src,msg) do { \
34 if (!mono_gc_is_moving ()) \
35 MONO_GC_REGISTER_ROOT_PINNING ((x),(src),(msg)); \
39 * Return a GC descriptor for an array containing N pointers to memory allocated
40 * by mono_gc_alloc_fixed ().
42 /* For SGEN, the result of alloc_fixed () is not GC tracked memory */
43 #define MONO_GC_ROOT_DESCR_FOR_FIXED(n) (mono_gc_is_moving () ? mono_gc_make_root_descr_all_refs (0) : MONO_GC_DESCRIPTOR_NULL)
45 /* Register a memory location holding a single object reference as a GC root */
46 #define MONO_GC_REGISTER_ROOT_SINGLE(x,src,msg) do { \
47 g_assert (sizeof (x) == sizeof (MonoObject*)); \
48 mono_gc_register_root ((char*)&(x), sizeof(MonoObject*), mono_gc_make_root_descr_all_refs (1), (src), (msg)); \
52 * This is used for fields which point to objects which are kept alive by other references
55 #define MONO_GC_REGISTER_ROOT_IF_MOVING(x,src,msg) do { \
56 if (mono_gc_is_moving ()) \
57 MONO_GC_REGISTER_ROOT_SINGLE(x,src,msg); \
60 #define MONO_GC_UNREGISTER_ROOT_IF_MOVING(x) do { \
61 if (mono_gc_is_moving ()) \
62 MONO_GC_UNREGISTER_ROOT (x); \
65 /* useful until we keep track of gc-references in corlib etc. */
66 #define IS_GC_REFERENCE(class,t) (mono_gc_is_moving () ? FALSE : ((t)->type == MONO_TYPE_U && (class)->image == mono_defaults.corlib))
68 void mono_object_register_finalizer (MonoObject *obj);
69 void ves_icall_System_GC_InternalCollect (int generation);
70 gint64 ves_icall_System_GC_GetTotalMemory (MonoBoolean forceCollection);
71 void ves_icall_System_GC_KeepAlive (MonoObject *obj);
72 void ves_icall_System_GC_ReRegisterForFinalize (MonoObject *obj);
73 void ves_icall_System_GC_SuppressFinalize (MonoObject *obj);
74 void ves_icall_System_GC_WaitForPendingFinalizers (void);
76 MonoObject *ves_icall_System_GCHandle_GetTarget (guint32 handle);
77 guint32 ves_icall_System_GCHandle_GetTargetHandle (MonoObject *obj, guint32 handle, gint32 type);
78 void ves_icall_System_GCHandle_FreeHandle (guint32 handle);
79 gpointer ves_icall_System_GCHandle_GetAddrOfPinnedObject (guint32 handle);
80 void ves_icall_System_GC_register_ephemeron_array (MonoObject *array);
81 MonoObject *ves_icall_System_GC_get_ephemeron_tombstone (void);
83 MonoBoolean ves_icall_Mono_Runtime_SetGCAllowSynchronousMajor (MonoBoolean flag);
85 extern void mono_gc_init (void);
86 extern void mono_gc_base_init (void);
87 extern void mono_gc_cleanup (void);
88 extern void mono_gc_base_cleanup (void);
91 * Return whenever the current thread is registered with the GC (i.e. started
92 * by the GC pthread wrappers on unix.
94 extern gboolean mono_gc_is_gc_thread (void);
96 extern gboolean mono_gc_is_finalizer_internal_thread (MonoInternalThread *thread);
98 extern void mono_gc_set_stack_end (void *stack_end);
100 /* only valid after the RECLAIM_START GC event and before RECLAIM_END
101 * Not exported in public headers, but can be linked to (unsupported).
103 gboolean mono_object_is_alive (MonoObject* obj);
104 gboolean mono_gc_is_finalizer_thread (MonoThread *thread);
105 gpointer mono_gc_out_of_memory (size_t size);
106 void mono_gc_enable_events (void);
107 void mono_gc_enable_alloc_events (void);
109 void mono_gchandle_set_target (guint32 gchandle, MonoObject *obj);
111 /*Ephemeron functionality. Sgen only*/
112 gboolean mono_gc_ephemeron_array_add (MonoObject *obj);
114 /* To disable synchronous, evacuating collections - concurrent SGen only */
115 gboolean mono_gc_set_allow_synchronous_major (gboolean flag);
118 mono_gc_GCHandle_CheckCurrentDomain (guint32 gchandle);
120 /* User defined marking function */
121 /* It should work like this:
122 * foreach (ref in GC references in the are structure pointed to by ADDR)
125 typedef void (*MonoGCMarkFunc) (MonoObject **addr, void *gc_data);
126 typedef void (*MonoGCRootMarkFunc) (void *addr, MonoGCMarkFunc mark_func, void *gc_data);
128 /* Create a descriptor with a user defined marking function */
129 MonoGCDescriptor mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker);
131 /* Return whenever user defined marking functions are supported */
132 gboolean mono_gc_user_markers_supported (void);
134 /* desc is the result from mono_gc_make_descr*. A NULL value means
135 * all the words might contain GC pointers.
136 * The memory is non-moving and it will be explicitly deallocated.
137 * size bytes will be available from the returned address (ie, descr
138 * must not be stored in the returned memory)
139 * NOTE: Under Boehm, this returns memory allocated using GC_malloc, so the result should
140 * be stored into a location registered using MONO_GC_REGISTER_ROOT_FIXED ().
142 void* mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg);
143 void mono_gc_free_fixed (void* addr);
145 /* make sure the gchandle was allocated for an object in domain */
146 gboolean mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain);
147 void mono_gchandle_free_domain (MonoDomain *domain);
149 typedef void (*FinalizerThreadCallback) (gpointer user_data);
151 /* if there are finalizers to run, run them. Returns the number of finalizers run */
152 gboolean mono_gc_pending_finalizers (void);
153 void mono_gc_finalize_notify (void);
155 void* mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size);
156 void* mono_gc_alloc_obj (MonoVTable *vtable, size_t size);
157 void* mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length);
158 void* mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size);
159 void* mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len);
160 MonoGCDescriptor mono_gc_make_descr_for_string (gsize *bitmap, int numbits);
162 void mono_gc_register_for_finalization (MonoObject *obj, void *user_data);
163 void mono_gc_add_memory_pressure (gint64 value);
164 MONO_API int mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg);
165 void mono_gc_deregister_root (char* addr);
166 int mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size);
167 void mono_gc_run_finalize (void *obj, void *data);
168 void mono_gc_clear_domain (MonoDomain * domain);
169 void* mono_gc_alloc_mature (MonoVTable *vtable);
172 * Register a root which can only be written using a write barrier.
173 * Writes to the root must be done using a write barrier (MONO_ROOT_SETREF).
174 * If the root uses an user defined mark routine, the writes are not required to be
175 * to the area between START and START+SIZE.
176 * The write barrier allows the GC to avoid scanning this root at each collection, so it
178 * FIXME: Add an API for clearing remset entries if a root with a user defined
179 * mark routine is deleted.
181 int mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg);
183 void mono_gc_wbarrier_set_root (gpointer ptr, MonoObject *value);
185 /* Set a field of a root registered using mono_gc_register_root_wbarrier () */
186 #define MONO_ROOT_SETREF(s,fieldname,value) do { \
187 mono_gc_wbarrier_set_root (&((s)->fieldname), (MonoObject*)value); \
190 void mono_gc_finalize_threadpool_threads (void);
192 /* fast allocation support */
194 /* Accessible using mono_marshal_wrapper_info_from_wrapper () */
198 } AllocatorWrapperInfo;
200 int mono_gc_get_aligned_size_for_allocator (int size);
201 MonoMethod* mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size);
202 MonoMethod* mono_gc_get_managed_array_allocator (MonoClass *klass);
203 MonoMethod *mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath);
205 guint32 mono_gc_get_managed_allocator_types (void);
207 /* Return a short string identifying the GC, indented to be saved in AOT images */
208 const char *mono_gc_get_gc_name (void);
210 /* Fast write barriers */
211 MonoMethod* mono_gc_get_specific_write_barrier (gboolean is_concurrent);
212 MonoMethod* mono_gc_get_write_barrier (void);
214 /* Fast valuetype copy */
215 void mono_gc_wbarrier_value_copy_bitmap (gpointer dest, gpointer src, int size, unsigned bitmap);
217 /* helper for the managed alloc support */
218 MonoString *mono_string_alloc (int length);
221 * Functions supplied by the runtime and called by the GC. Currently only used
226 * Function called during thread startup/attach to allocate thread-local data
227 * needed by the other functions.
229 gpointer (*thread_attach_func) (void);
231 * Function called during thread deatch to free the data allocated by
232 * thread_attach_func.
234 void (*thread_detach_func) (gpointer user_data);
236 * Function called from every thread when suspending for GC. It can save
237 * data needed for marking from thread stacks. user_data is the data returned
238 * by attach_func. This might called with GC locks held and the word stopped,
239 * so it shouldn't do any synchronization etc.
241 void (*thread_suspend_func) (gpointer user_data, void *sigcontext, MonoContext *ctx);
243 * Function called to mark from thread stacks. user_data is the data returned
244 * by attach_func. This is called twice, with the word stopped:
245 * - in the first pass, it should mark areas of the stack using
246 * conservative marking by calling mono_gc_conservatively_scan_area ().
247 * - in the second pass, it should mark the remaining areas of the stack
248 * using precise marking by calling mono_gc_scan_object ().
250 void (*thread_mark_func) (gpointer user_data, guint8 *stack_start, guint8 *stack_end, gboolean precise, void *gc_data);
252 * Function called for debugging to get the current managed method for
253 * tracking the provenances of objects.
255 gpointer (*get_provenance_func) (void);
258 /* Set the callback functions callable by the GC */
259 void mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks);
260 MonoGCCallbacks *mono_gc_get_gc_callbacks (void);
262 /* Functions callable from the thread mark func */
264 /* Scan the memory area between START and END conservatively */
265 void mono_gc_conservatively_scan_area (void *start, void *end);
267 /* Scan OBJ, returning its new address */
268 void *mono_gc_scan_object (void *obj, void *gc_data);
270 /* Return the suspend signal number used by the GC to suspend threads,
271 or -1 if not applicable. */
272 int mono_gc_get_suspend_signal (void);
274 /* Return the suspend signal number used by the GC to suspend threads,
275 or -1 if not applicable. */
276 int mono_gc_get_restart_signal (void);
279 * Return a human readable description of the GC in malloc-ed memory.
281 char* mono_gc_get_description (void);
284 * Configure the GC to desktop mode
286 void mono_gc_set_desktop_mode (void);
289 * Return whenever this GC can move objects
291 gboolean mono_gc_is_moving (void);
293 typedef void* (*MonoGCLockedCallbackFunc) (void *data);
295 void* mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data);
297 int mono_gc_get_los_limit (void);
299 guint8* mono_gc_get_card_table (int *shift_bits, gpointer *card_mask);
300 gboolean mono_gc_card_table_nursery_check (void);
302 void* mono_gc_get_nursery (int *shift_bits, size_t *size);
304 void mono_gc_set_current_thread_appdomain (MonoDomain *domain);
306 void mono_gc_set_skip_thread (gboolean skip);
309 int mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
313 * Return whenever GC is disabled
315 gboolean mono_gc_is_disabled (void);
318 * Return whenever this is the null GC
320 gboolean mono_gc_is_null (void);
322 void mono_gc_set_string_length (MonoString *str, gint32 new_length);
324 #if defined(__MACH__)
325 void mono_gc_register_mach_exception_thread (pthread_t thread);
326 pthread_t mono_gc_get_mach_exception_thread (void);
329 gboolean mono_gc_precise_stack_mark_enabled (void);
331 typedef struct _RefQueueEntry RefQueueEntry;
333 struct _RefQueueEntry {
341 struct _MonoReferenceQueue {
342 RefQueueEntry *queue;
343 mono_reference_queue_callback callback;
344 MonoReferenceQueue *next;
345 gboolean should_be_deleted;
349 MONO_GC_FINALIZER_EXTENSION_VERSION = 1,
354 gboolean (*is_class_finalization_aware) (MonoClass *klass);
355 void (*object_queued_for_finalization) (MonoObject *object);
356 } MonoGCFinalizerCallbacks;
358 MONO_API void mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks);
362 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved);
365 guint mono_gc_get_vtable_bits (MonoClass *klass);
367 void mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size);
369 /* If set, print debugging messages around finalizers. */
370 extern gboolean log_finalizers;
372 /* If set, do not run finalizers. */
373 extern gboolean do_not_finalize;
375 #endif /* __MONO_METADATA_GC_INTERNAL_H__ */