/*
* boehm-gc.c: GC implementation using either the installed or included Boehm GC.
*
+ * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
+ * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
*/
#include "config.h"
#define GC_I_HIDE_POINTERS
-#include <mono/os/gc_wrapper.h>
+#include <mono/metadata/gc-internal.h>
#include <mono/metadata/mono-gc.h>
#include <mono/metadata/gc-internal.h>
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/class-internals.h>
#include <mono/metadata/method-builder.h>
#include <mono/metadata/opcodes.h>
+#include <mono/metadata/domain-internals.h>
+#include <mono/metadata/metadata-internals.h>
#include <mono/utils/mono-logger.h>
+#include <mono/utils/mono-time.h>
+#include <mono/utils/dtrace.h>
#if HAVE_BOEHM_GC
#include "private/pthread_support.h"
#endif
+#define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
+
+static gboolean gc_initialized = FALSE;
+
static void
mono_gc_warning (char *msg, GC_word arg)
{
void
mono_gc_base_init (void)
{
- GC_init ();
+ if (gc_initialized)
+ return;
+
+ /*
+ * Handle the case when we are called from a thread different from the main thread,
+ * confusing libgc.
+ * FIXME: Move this to libgc where it belongs.
+ *
+ * we used to do this only when running on valgrind,
+ * but it happens also in other setups.
+ */
+#if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
+ {
+ size_t size;
+ void *sstart;
+ pthread_attr_t attr;
+ pthread_getattr_np (pthread_self (), &attr);
+ pthread_attr_getstack (&attr, &sstart, &size);
+ pthread_attr_destroy (&attr);
+ /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
+#ifdef __ia64__
+ /*
+ * The calculation above doesn't seem to work on ia64, also we need to set
+ * GC_register_stackbottom as well, but don't know how.
+ */
+#else
+ /* apparently with some linuxthreads implementations sstart can be NULL,
+ * fallback to the more imprecise method (bug# 78096).
+ */
+ if (sstart) {
+ GC_stackbottom = (char*)sstart + size;
+ } else {
+ int dummy;
+ gsize stack_bottom = (gsize)&dummy;
+ stack_bottom += 4095;
+ stack_bottom &= ~4095;
+ GC_stackbottom = (char*)stack_bottom;
+ }
+#endif
+ }
+#elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
+ GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
+#else
+ {
+ int dummy;
+ gsize stack_bottom = (gsize)&dummy;
+ stack_bottom += 4095;
+ stack_bottom &= ~4095;
+ /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
+ GC_stackbottom = (char*)stack_bottom;
+ }
+#endif
+
+#if !defined(PLATFORM_ANDROID)
+ /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
GC_no_dls = TRUE;
+#endif
+ GC_init ();
GC_oom_fn = mono_gc_out_of_memory;
GC_set_warn_proc (mono_gc_warning);
GC_finalize_on_demand = 1;
#ifdef HAVE_GC_GCJ_MALLOC
GC_init_gcj_malloc (5, NULL);
#endif
+ mono_gc_enable_events ();
+ gc_initialized = TRUE;
}
void
mono_gc_collect (int generation)
{
+ MONO_PROBE_GC_BEGIN (generation);
+
+ mono_perfcounters->gc_induced++;
GC_gcollect ();
+
+ MONO_PROBE_GC_END (generation);
+#if defined(ENABLE_DTRACE) && defined(__sun__)
+ /* This works around a dtrace -G problem on Solaris.
+ Limit its actual use to when the probe is enabled. */
+ if (MONO_PROBE_GC_END_ENABLED ())
+ sleep(0);
+#endif
}
int
gboolean
mono_gc_is_gc_thread (void)
{
-#ifdef USE_INCLUDED_LIBGC
+#if GC_VERSION_MAJOR >= 7
+ return TRUE;
+#elif defined(USE_INCLUDED_LIBGC)
return GC_thread_is_registered ();
#else
return TRUE;
gboolean
mono_gc_register_thread (void *baseptr)
{
+#if GC_VERSION_MAJOR >= 7
+ struct GC_stack_base sb;
+ int res;
+
+ res = GC_get_stack_base (&sb);
+ if (res != GC_SUCCESS) {
+ sb.mem_base = baseptr;
+#ifdef __ia64__
+ /* Can't determine the register stack bounds */
+ g_error ("mono_gc_register_thread failed ().\n");
+#endif
+ }
+ res = GC_register_my_thread (&sb);
+ if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
+ g_warning ("GC_register_my_thread () failed.\n");
+ return FALSE;
+ }
+ return TRUE;
+#else
if (mono_gc_is_gc_thread())
return TRUE;
-#if defined(USE_INCLUDED_LIBGC) && !defined(PLATFORM_WIN32)
+#if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
return GC_thread_register_foreign (baseptr);
#else
return FALSE;
#endif
+#endif
}
gboolean
mono_object_is_alive (MonoObject* o)
{
#ifdef USE_INCLUDED_LIBGC
- return GC_is_marked (o);
+ return GC_is_marked ((gpointer)o);
#else
return TRUE;
#endif
#ifdef USE_INCLUDED_LIBGC
+static gint64 gc_start_time;
+
static void
on_gc_notification (GCEventType event)
{
+ if (event == MONO_GC_EVENT_START) {
+ mono_perfcounters->gc_collections0++;
+ mono_stats.major_gc_count ++;
+ gc_start_time = mono_100ns_ticks ();
+ } else if (event == MONO_GC_EVENT_END) {
+ guint64 heap_size = GC_get_heap_size ();
+ guint64 used_size = heap_size - GC_get_free_bytes ();
+ mono_perfcounters->gc_total_bytes = used_size;
+ mono_perfcounters->gc_committed_bytes = heap_size;
+ mono_perfcounters->gc_reserved_bytes = heap_size;
+ mono_perfcounters->gc_gen0size = heap_size;
+ mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
+ mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
+ }
mono_profiler_gc_event ((MonoGCEvent) event, 0);
}
static void
on_gc_heap_resize (size_t new_size)
{
+ guint64 heap_size = GC_get_heap_size ();
+ mono_perfcounters->gc_committed_bytes = heap_size;
+ mono_perfcounters->gc_reserved_bytes = heap_size;
+ mono_perfcounters->gc_gen0size = heap_size;
mono_profiler_gc_heap_resize (new_size);
}
}
void
-mono_gc_weak_link_add (void **link_addr, MonoObject *obj)
+mono_gc_deregister_root (char* addr)
+{
+#ifndef HOST_WIN32
+ /* FIXME: libgc doesn't define this work win32 for some reason */
+ /* FIXME: No size info */
+ GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
+#endif
+}
+
+void
+mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
{
/* libgc requires that we use HIDE_POINTER... */
*link_addr = (void*)HIDE_POINTER (obj);
return obj;
}
+void*
+mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
+{
+ return mono_gc_make_descr_from_bitmap (bitmap, numbits);
+}
+
+void*
+mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
+{
+ return mono_gc_make_descr_from_bitmap (bitmap, numbits);
+}
+
+void*
+mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
+{
+ /* libgc has no usable support for arrays... */
+ return GC_NO_DESCRIPTOR;
+}
+
void*
mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
{
+#ifdef HAVE_GC_GCJ_MALLOC
+ /* It seems there are issues when the bitmap doesn't fit: play it safe */
+ if (numbits >= 30)
+ return GC_NO_DESCRIPTOR;
+ else
+ return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
+#else
return NULL;
+#endif
}
void*
mono_gc_alloc_fixed (size_t size, void *descr)
{
- return GC_MALLOC (size);
+ /* To help track down typed allocation bugs */
+ /*
+ static int count;
+ count ++;
+ if (count == atoi (getenv ("COUNT2")))
+ printf ("HIT!\n");
+ if (count > atoi (getenv ("COUNT2")))
+ return GC_MALLOC (size);
+ */
+
+ if (descr)
+ return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
+ else
+ return GC_MALLOC (size);
}
void
return GC_should_invoke_finalizers ();
}
+/*
+ * LOCKING: Assumes the domain_finalizers lock is held.
+ */
+static void
+add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
+{
+ GSList *refs;
+
+ if (!domain->track_resurrection_objects_hash)
+ domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
+
+ refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
+ refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
+ g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
+}
+
+void
+mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
+{
+ MonoDomain *domain;
+
+ if (!obj)
+ return;
+
+ domain = mono_object_get_domain (obj);
+
+ mono_domain_finalizers_lock (domain);
+
+ add_weak_track_handle_internal (domain, obj, handle);
+
+ g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
+
+ mono_domain_finalizers_unlock (domain);
+}
+
+/*
+ * LOCKING: Assumes the domain_finalizers lock is held.
+ */
+static void
+remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
+{
+ GSList *refs;
+
+ if (!domain->track_resurrection_objects_hash)
+ return;
+
+ refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
+ refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
+ g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
+}
+
+void
+mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
+{
+ MonoDomain *domain = mono_domain_get ();
+
+ mono_domain_finalizers_lock (domain);
+
+ if (old_obj)
+ remove_weak_track_handle_internal (domain, old_obj, gchandle);
+ if (obj)
+ add_weak_track_handle_internal (domain, obj, gchandle);
+
+ mono_domain_finalizers_unlock (domain);
+}
+
+void
+mono_gc_remove_weak_track_handle (guint32 gchandle)
+{
+ MonoDomain *domain = mono_domain_get ();
+ MonoObject *obj;
+
+ /* Clean our entries in the two hashes in MonoDomain */
+
+ mono_domain_finalizers_lock (domain);
+
+ /* Get the original object this handle pointed to */
+ obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
+ if (obj) {
+ g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
+
+ remove_weak_track_handle_internal (domain, obj, gchandle);
+ }
+
+ mono_domain_finalizers_unlock (domain);
+}
+
+GSList*
+mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
+{
+ GSList *refs = NULL;
+
+ if (domain->track_resurrection_objects_hash) {
+ refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
+
+ if (refs)
+ /*
+ * Since we don't run finalizers again for resurrected objects,
+ * no need to keep these around.
+ */
+ g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
+ }
+
+ return refs;
+}
+
void
mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
{
}
void
-mono_gc_wbarrier_arrayref_copy (MonoArray *arr, gpointer slot_ptr, int count)
+mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
{
- /* no need to do anything */
+ memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
}
void
*(void**)ptr = value;
}
+void
+mono_gc_wbarrier_generic_nostore (gpointer ptr)
+{
+}
+
void
mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
{
+ memmove (dest, src, count * mono_class_value_size (klass, NULL));
+}
+
+void
+mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
+{
+ /* do not copy the sync state */
+ memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
+ mono_object_class (obj)->instance_size - sizeof (MonoObject));
}
void
-mono_gc_wbarrier_object (MonoObject *object)
+mono_gc_clear_domain (MonoDomain *domain)
{
}
+int
+mono_gc_get_suspend_signal (void)
+{
+#ifdef USE_INCLUDED_GC
+ return GC_get_suspend_signal ();
+#else
+ return -1;
+#endif
+}
+
#if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
extern __thread MONO_TLS_FAST void* GC_thread_tls;
#include "metadata-internals.h"
}
static MonoMethod* alloc_method_cache [ATYPE_NUM];
-#define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
/*
* If possible, generate a managed method that can quickly allocate objects in class
return mono_gc_get_managed_allocator_by_type (atype);
}
+MonoMethod*
+mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
+{
+ return NULL;
+}
+
/**
* mono_gc_get_managed_allocator_id:
*
return res;
}
+guint32
+mono_gc_get_managed_allocator_types (void)
+{
+ return ATYPE_NUM;
+}
+
#else
MonoMethod*
return NULL;
}
+MonoMethod*
+mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
+{
+ return NULL;
+}
+
int
mono_gc_get_managed_allocator_type (MonoMethod *managed_alloc)
{
return NULL;
}
+guint32
+mono_gc_get_managed_allocator_types (void)
+{
+ return 0;
+}
+
#endif
#endif /* no Boehm GC */
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