2 * metadata/gc-internals.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)
8 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
11 #ifndef __MONO_METADATA_GC_INTERNAL_H__
12 #define __MONO_METADATA_GC_INTERNAL_H__
15 #include <mono/utils/gc_wrapper.h>
16 #include <mono/metadata/object-internals.h>
17 #include <mono/metadata/threads-types.h>
18 #include <mono/sgen/gc-internal-agnostic.h>
20 #define mono_domain_finalizers_lock(domain) mono_os_mutex_lock (&(domain)->finalizable_objects_hash_lock);
21 #define mono_domain_finalizers_unlock(domain) mono_os_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);
84 extern void mono_gc_init (void);
85 extern void mono_gc_base_init (void);
86 extern void mono_gc_cleanup (void);
87 extern void mono_gc_base_cleanup (void);
90 * Return whenever the current thread is registered with the GC (i.e. started
91 * by the GC pthread wrappers on unix.
93 extern gboolean mono_gc_is_gc_thread (void);
95 extern gboolean mono_gc_is_finalizer_internal_thread (MonoInternalThread *thread);
97 extern void mono_gc_set_stack_end (void *stack_end);
99 /* only valid after the RECLAIM_START GC event and before RECLAIM_END
100 * Not exported in public headers, but can be linked to (unsupported).
102 gboolean mono_object_is_alive (MonoObject* obj);
103 gboolean mono_gc_is_finalizer_thread (MonoThread *thread);
104 gpointer mono_gc_out_of_memory (size_t size);
106 void mono_gchandle_set_target (guint32 gchandle, MonoObject *obj);
108 /*Ephemeron functionality. Sgen only*/
109 gboolean mono_gc_ephemeron_array_add (MonoObject *obj);
112 mono_gc_GCHandle_CheckCurrentDomain (guint32 gchandle);
114 /* User defined marking function */
115 /* It should work like this:
116 * foreach (ref in GC references in the are structure pointed to by ADDR)
119 typedef void (*MonoGCMarkFunc) (MonoObject **addr, void *gc_data);
120 typedef void (*MonoGCRootMarkFunc) (void *addr, MonoGCMarkFunc mark_func, void *gc_data);
122 /* Create a descriptor with a user defined marking function */
123 MonoGCDescriptor mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker);
125 /* Return whenever user defined marking functions are supported */
126 gboolean mono_gc_user_markers_supported (void);
128 /* desc is the result from mono_gc_make_descr*. A NULL value means
129 * all the words might contain GC pointers.
130 * The memory is non-moving and it will be explicitly deallocated.
131 * size bytes will be available from the returned address (ie, descr
132 * must not be stored in the returned memory)
133 * NOTE: Under Boehm, this returns memory allocated using GC_malloc, so the result should
134 * be stored into a location registered using MONO_GC_REGISTER_ROOT_FIXED ().
136 void* mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg);
137 void mono_gc_free_fixed (void* addr);
139 /* make sure the gchandle was allocated for an object in domain */
140 gboolean mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain);
141 void mono_gchandle_free_domain (MonoDomain *domain);
143 typedef void (*FinalizerThreadCallback) (gpointer user_data);
145 void* mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size);
146 void* mono_gc_alloc_obj (MonoVTable *vtable, size_t size);
147 void* mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length);
148 void* mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size);
149 void* mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len);
150 void* mono_gc_alloc_mature (MonoVTable *vtable, size_t size);
151 MonoGCDescriptor mono_gc_make_descr_for_string (gsize *bitmap, int numbits);
153 void mono_gc_register_for_finalization (MonoObject *obj, void *user_data);
154 void mono_gc_add_memory_pressure (gint64 value);
155 MONO_API int mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg);
156 void mono_gc_deregister_root (char* addr);
157 void mono_gc_finalize_domain (MonoDomain *domain);
158 void mono_gc_run_finalize (void *obj, void *data);
159 void mono_gc_clear_domain (MonoDomain * domain);
160 /* Signal early termination of finalizer processing inside the gc */
161 void mono_gc_suspend_finalizers (void);
165 * Register a root which can only be written using a write barrier.
166 * Writes to the root must be done using a write barrier (MONO_ROOT_SETREF).
167 * If the root uses an user defined mark routine, the writes are not required to be
168 * to the area between START and START+SIZE.
169 * The write barrier allows the GC to avoid scanning this root at each collection, so it
171 * FIXME: Add an API for clearing remset entries if a root with a user defined
172 * mark routine is deleted.
174 int mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg);
176 void mono_gc_wbarrier_set_root (gpointer ptr, MonoObject *value);
178 /* Set a field of a root registered using mono_gc_register_root_wbarrier () */
179 #define MONO_ROOT_SETREF(s,fieldname,value) do { \
180 mono_gc_wbarrier_set_root (&((s)->fieldname), (MonoObject*)value); \
183 void mono_gc_finalize_threadpool_threads (void);
185 /* fast allocation support */
188 // Regular fast path allocator.
189 MANAGED_ALLOCATOR_REGULAR,
190 // Managed allocator that just calls into the runtime. Used when allocation profiling w/ AOT.
191 MANAGED_ALLOCATOR_SLOW_PATH,
192 } ManagedAllocatorVariant;
194 int mono_gc_get_aligned_size_for_allocator (int size);
195 MonoMethod* mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size);
196 MonoMethod* mono_gc_get_managed_array_allocator (MonoClass *klass);
197 MonoMethod *mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant);
199 guint32 mono_gc_get_managed_allocator_types (void);
201 /* Return a short string identifying the GC, indented to be saved in AOT images */
202 const char *mono_gc_get_gc_name (void);
204 /* Fast write barriers */
205 MonoMethod* mono_gc_get_specific_write_barrier (gboolean is_concurrent);
206 MonoMethod* mono_gc_get_write_barrier (void);
208 /* Fast valuetype copy */
209 void mono_gc_wbarrier_value_copy_bitmap (gpointer dest, gpointer src, int size, unsigned bitmap);
211 /* helper for the managed alloc support */
213 ves_icall_string_alloc (int length);
216 * Functions supplied by the runtime and called by the GC. Currently only used
221 * Function called during thread startup/attach to allocate thread-local data
222 * needed by the other functions.
224 gpointer (*thread_attach_func) (void);
226 * Function called during thread deatch to free the data allocated by
227 * thread_attach_func.
229 void (*thread_detach_func) (gpointer user_data);
231 * Function called from every thread when suspending for GC. It can save
232 * data needed for marking from thread stacks. user_data is the data returned
233 * by attach_func. This might called with GC locks held and the word stopped,
234 * so it shouldn't do any synchronization etc.
236 void (*thread_suspend_func) (gpointer user_data, void *sigcontext, MonoContext *ctx);
238 * Function called to mark from thread stacks. user_data is the data returned
239 * by attach_func. This is called twice, with the word stopped:
240 * - in the first pass, it should mark areas of the stack using
241 * conservative marking by calling mono_gc_conservatively_scan_area ().
242 * - in the second pass, it should mark the remaining areas of the stack
243 * using precise marking by calling mono_gc_scan_object ().
245 void (*thread_mark_func) (gpointer user_data, guint8 *stack_start, guint8 *stack_end, gboolean precise, void *gc_data);
247 * Function called for debugging to get the current managed method for
248 * tracking the provenances of objects.
250 gpointer (*get_provenance_func) (void);
253 /* Set the callback functions callable by the GC */
254 void mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks);
255 MonoGCCallbacks *mono_gc_get_gc_callbacks (void);
257 /* Functions callable from the thread mark func */
259 /* Scan the memory area between START and END conservatively */
260 void mono_gc_conservatively_scan_area (void *start, void *end);
262 /* Scan OBJ, returning its new address */
263 void *mono_gc_scan_object (void *obj, void *gc_data);
265 /* Return the suspend signal number used by the GC to suspend threads,
266 or -1 if not applicable. */
267 int mono_gc_get_suspend_signal (void);
269 /* Return the suspend signal number used by the GC to suspend threads,
270 or -1 if not applicable. */
271 int mono_gc_get_restart_signal (void);
274 * Return a human readable description of the GC in malloc-ed memory.
276 char* mono_gc_get_description (void);
279 * Configure the GC to desktop mode
281 void mono_gc_set_desktop_mode (void);
284 * Return whenever this GC can move objects
286 gboolean mono_gc_is_moving (void);
288 typedef void* (*MonoGCLockedCallbackFunc) (void *data);
290 void* mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data);
292 int mono_gc_get_los_limit (void);
294 guint8* mono_gc_get_card_table (int *shift_bits, gpointer *card_mask);
295 gboolean mono_gc_card_table_nursery_check (void);
297 void* mono_gc_get_nursery (int *shift_bits, size_t *size);
299 void mono_gc_set_skip_thread (gboolean skip);
302 int mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
306 * Return whenever GC is disabled
308 gboolean mono_gc_is_disabled (void);
311 * Return whenever this is the null GC
313 gboolean mono_gc_is_null (void);
315 void mono_gc_set_string_length (MonoString *str, gint32 new_length);
317 #if defined(__MACH__)
318 void mono_gc_register_mach_exception_thread (pthread_t thread);
319 pthread_t mono_gc_get_mach_exception_thread (void);
322 gboolean mono_gc_precise_stack_mark_enabled (void);
324 typedef struct _RefQueueEntry RefQueueEntry;
326 struct _RefQueueEntry {
334 struct _MonoReferenceQueue {
335 RefQueueEntry *queue;
336 mono_reference_queue_callback callback;
337 MonoReferenceQueue *next;
338 gboolean should_be_deleted;
342 MONO_GC_FINALIZER_EXTENSION_VERSION = 1,
347 gboolean (*is_class_finalization_aware) (MonoClass *klass);
348 void (*object_queued_for_finalization) (MonoObject *object);
349 } MonoGCFinalizerCallbacks;
351 MONO_API void mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks);
355 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved);
358 guint mono_gc_get_vtable_bits (MonoClass *klass);
360 void mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size);
362 gboolean mono_gc_is_critical_method (MonoMethod *method);
364 /* If set, print debugging messages around finalizers. */
365 extern gboolean log_finalizers;
367 /* If set, do not run finalizers. */
368 extern gboolean mono_do_not_finalize;
369 /* List of names of classes not to finalize. */
370 extern gchar **mono_do_not_finalize_class_names;
372 #endif /* __MONO_METADATA_GC_INTERNAL_H__ */