2 * metadata/gc-internal.h: Internal GC interface
4 * Author: Paolo Molaro <lupus@ximian.com>
6 * (C) 2002 Ximian, Inc.
9 #ifndef __MONO_METADATA_GC_INTERNAL_H__
10 #define __MONO_METADATA_GC_INTERNAL_H__
13 #include <mono/metadata/object-internals.h>
14 #include <mono/utils/gc_wrapper.h>
16 #define mono_domain_finalizers_lock(domain) EnterCriticalSection (&(domain)->finalizable_objects_hash_lock);
17 #define mono_domain_finalizers_unlock(domain) LeaveCriticalSection (&(domain)->finalizable_objects_hash_lock);
19 #define MONO_GC_REGISTER_ROOT(x) mono_gc_register_root ((char*)&(x), sizeof(x), NULL)
21 #define MONO_GC_UNREGISTER_ROOT(x) mono_gc_deregister_root ((char*)&(x))
23 void mono_object_register_finalizer (MonoObject *obj) MONO_INTERNAL;
24 void ves_icall_System_GC_InternalCollect (int generation) MONO_INTERNAL;
25 gint64 ves_icall_System_GC_GetTotalMemory (MonoBoolean forceCollection) MONO_INTERNAL;
26 void ves_icall_System_GC_KeepAlive (MonoObject *obj) MONO_INTERNAL;
27 void ves_icall_System_GC_ReRegisterForFinalize (MonoObject *obj) MONO_INTERNAL;
28 void ves_icall_System_GC_SuppressFinalize (MonoObject *obj) MONO_INTERNAL;
29 void ves_icall_System_GC_WaitForPendingFinalizers (void) MONO_INTERNAL;
31 MonoObject *ves_icall_System_GCHandle_GetTarget (guint32 handle) MONO_INTERNAL;
32 guint32 ves_icall_System_GCHandle_GetTargetHandle (MonoObject *obj, guint32 handle, gint32 type) MONO_INTERNAL;
33 void ves_icall_System_GCHandle_FreeHandle (guint32 handle) MONO_INTERNAL;
34 gpointer ves_icall_System_GCHandle_GetAddrOfPinnedObject (guint32 handle) MONO_INTERNAL;
36 extern void mono_gc_init (void) MONO_INTERNAL;
37 extern void mono_gc_base_init (void) MONO_INTERNAL;
38 extern void mono_gc_cleanup (void) MONO_INTERNAL;
39 extern void mono_gc_enable (void) MONO_INTERNAL;
40 extern void mono_gc_disable (void) MONO_INTERNAL;
43 * Return whenever the current thread is registered with the GC (i.e. started
44 * by the GC pthread wrappers on unix.
46 extern gboolean mono_gc_is_gc_thread (void) MONO_INTERNAL;
49 * Try to register a foreign thread with the GC, if we fail or the backend
50 * can't cope with this concept - we return FALSE.
52 extern gboolean mono_gc_register_thread (void *baseptr) MONO_INTERNAL;
54 /* only valid after the RECLAIM_START GC event and before RECLAIM_END
55 * Not exported in public headers, but can be linked to (unsupported).
57 extern gboolean mono_object_is_alive (MonoObject* obj);
58 extern gboolean mono_gc_is_finalizer_thread (MonoThread *thread);
59 extern gpointer mono_gc_out_of_memory (size_t size);
60 extern void mono_gc_enable_events (void);
62 /* disappearing link functionality */
63 void mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track) MONO_INTERNAL;
64 void mono_gc_weak_link_remove (void **link_addr) MONO_INTERNAL;
65 MonoObject *mono_gc_weak_link_get (void **link_addr) MONO_INTERNAL;
68 void mono_gc_add_weak_track_handle (MonoObject *obj, guint32 gchandle) MONO_INTERNAL;
69 void mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle) MONO_INTERNAL;
70 void mono_gc_remove_weak_track_handle (guint32 gchandle) MONO_INTERNAL;
71 GSList* mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj) MONO_INTERNAL;
75 GCHandle_CheckCurrentDomain (guint32 gchandle) MONO_INTERNAL;
77 /* simple interface for data structures needed in the runtime */
78 void* mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits) MONO_INTERNAL;
80 /* User defined marking function */
81 /* It should work like this:
82 * foreach (ref in GC references in the are structure pointed to by ADDR)
83 * *ref = mark_func (*ref)
85 typedef void *(*MonoGCCopyFunc) (void *addr);
86 typedef void (*MonoGCMarkFunc) (void *addr, MonoGCCopyFunc mark_func);
88 /* Create a descriptor with a user defined marking function */
89 void *mono_gc_make_root_descr_user (MonoGCMarkFunc marker);
91 /* desc is the result from mono_gc_make_descr*. A NULL value means
92 * all the words might contain GC pointers.
93 * The memory is non-moving and it will be explicitly deallocated.
94 * size bytes will be available from the returned address (ie, descr
95 * must not be stored in the returned memory)
97 void* mono_gc_alloc_fixed (size_t size, void *descr) MONO_INTERNAL;
98 void mono_gc_free_fixed (void* addr) MONO_INTERNAL;
100 /* make sure the gchandle was allocated for an object in domain */
101 gboolean mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain) MONO_INTERNAL;
102 void mono_gchandle_free_domain (MonoDomain *domain) MONO_INTERNAL;
104 typedef void (*FinalizerThreadCallback) (gpointer user_data);
106 /* if there are finalizers to run, run them. Returns the number of finalizers run */
107 gboolean mono_gc_pending_finalizers (void) MONO_INTERNAL;
108 void mono_gc_finalize_notify (void) MONO_INTERNAL;
110 void* mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size) MONO_INTERNAL;
111 void* mono_gc_alloc_obj (MonoVTable *vtable, size_t size) MONO_INTERNAL;
112 void* mono_gc_make_descr_for_string (gsize *bitmap, int numbits) MONO_INTERNAL;
113 void* mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size) MONO_INTERNAL;
114 void* mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size) MONO_INTERNAL;
116 void mono_gc_register_for_finalization (MonoObject *obj, void *user_data) MONO_INTERNAL;
117 void mono_gc_add_memory_pressure (gint64 value) MONO_INTERNAL;
118 int mono_gc_register_root (char *start, size_t size, void *descr) MONO_INTERNAL;
119 void mono_gc_deregister_root (char* addr) MONO_INTERNAL;
120 int mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size) MONO_INTERNAL;
121 void mono_gc_run_finalize (void *obj, void *data) MONO_INTERNAL;
122 void mono_gc_clear_domain (MonoDomain * domain) MONO_INTERNAL;
125 * Register a root which can only be written using a write barrier.
126 * Writes to the root must be done using a write barrier (MONO_ROOT_SETREF).
127 * If the root uses an user defined mark routine, the writes are not required to be
128 * to the area between START and START+SIZE.
129 * The write barrier allows the GC to avoid scanning this root at each collection, so it
131 * FIXME: Add an API for clearing remset entries if a root with a user defined
132 * mark routine is deleted.
134 int mono_gc_register_root_wbarrier (char *start, size_t size, void *descr) MONO_INTERNAL;
136 void mono_gc_wbarrier_set_root (gpointer ptr, MonoObject *value) MONO_INTERNAL;
138 /* Set a field of a root registered using mono_gc_register_root_wbarrier () */
139 #define MONO_ROOT_SETREF(s,fieldname,value) do { \
140 mono_gc_wbarrier_set_root (&((s)->fieldname), (MonoObject*)value); \
143 void mono_gc_finalize_threadpool_threads (void) MONO_INTERNAL;
145 /* fast allocation support */
146 MonoMethod* mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box) MONO_INTERNAL;
147 int mono_gc_get_managed_allocator_type (MonoMethod *managed_alloc) MONO_INTERNAL;
148 MonoMethod *mono_gc_get_managed_allocator_by_type (int atype) MONO_INTERNAL;
150 guint32 mono_gc_get_managed_allocator_types (void) MONO_INTERNAL;
152 /* Fast write barriers */
153 MonoMethod* mono_gc_get_write_barrier (void) MONO_INTERNAL;
155 /* helper for the managed alloc support */
156 MonoString *mono_string_alloc (int length) MONO_INTERNAL;
159 * Functions supplied by the runtime and called by the GC. Currently only used
164 * Function called during thread startup/attach to allocate thread-local data
165 * needed by the other functions.
167 gpointer (*thread_attach_func) (void);
168 /* FIXME: Add a cleanup function too */
170 * Function called from every thread when suspending for GC. It can save
171 * data needed for marking from thread stacks. user_data is the data returned
172 * by attach_func. This might called with GC locks held and the word stopped,
173 * so it shouldn't do any synchronization etc.
175 void (*thread_suspend_func) (gpointer user_data, void *sigcontext);
177 * Function called to mark from thread stacks. user_data is the data returned
178 * by attach_func. This is called twice, with the word stopped:
179 * - in the first pass, it should mark areas of the stack using
180 * conservative marking by calling mono_gc_conservatively_scan_area ().
181 * - in the second pass, it should mark the remaining areas of the stack
182 * using precise marking by calling mono_gc_scan_object ().
184 void (*thread_mark_func) (gpointer user_data, guint8 *stack_start, guint8 *stack_end, gboolean precise);
187 /* Set the callback functions callable by the GC */
188 void mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks) MONO_INTERNAL;
190 /* Functions callable from the thread mark func */
192 /* Scan the memory area between START and END conservatively */
193 void mono_gc_conservatively_scan_area (void *start, void *end) MONO_INTERNAL;
195 /* Scan OBJ, returning its new address */
196 void *mono_gc_scan_object (void *obj) MONO_INTERNAL;
198 /* Return the bitmap encoded by a descriptor */
199 gsize* mono_gc_get_bitmap_for_descr (void *descr, int *numbits) MONO_INTERNAL;
201 #endif /* __MONO_METADATA_GC_INTERNAL_H__ */