text: /*
   * sgen-client-mono.h: Mono's client definitions for SGen.
   *
   * Copyright (C) 2014 Xamarin Inc
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Library General Public
   * License 2.0 as published by the Free Software Foundation;
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Library General Public License for more details.
   *
   * You should have received a copy of the GNU Library General Public
   * License 2.0 along with this library; if not, write to the Free
   * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #ifdef SGEN_DEFINE_OBJECT_VTABLE
  
  #include "sgen/sgen-archdep.h"
  #include "utils/mono-threads.h"
  #include "utils/mono-mmap.h"
  #include "metadata/object-internals.h"
  
  typedef MonoObject GCObject;
  typedef MonoVTable* GCVTable;
  
  static inline GCVTable
  SGEN_LOAD_VTABLE_UNCHECKED (GCObject *obj)
  {
  	return obj->vtable;
  }
  
  static inline SgenDescriptor
  sgen_vtable_get_descriptor (GCVTable vtable)
  {
  	return (SgenDescriptor)vtable->gc_descr;
  }
  
  typedef struct _SgenClientThreadInfo SgenClientThreadInfo;
  struct _SgenClientThreadInfo {
  	MonoThreadInfo info;
  
  	/*
  	 * `skip` is set to TRUE when STW fails to suspend a thread, most probably because
  	 * the underlying thread is dead.
  	*/
  	gboolean skip, suspend_done;
  	volatile int in_critical_region;
  
  	gpointer stopped_ip;	/* only valid if the thread is stopped */
  	MonoDomain *stopped_domain; /* dsto */
  
  	/*
  	This is set the argument of mono_gc_set_skip_thread.
  
  	A thread that knowingly holds no managed state can call this
  	function around blocking loops to reduce the GC burden by not
  	been scanned.
  	*/
  	gboolean gc_disabled;
  
  #ifdef SGEN_POSIX_STW
  	/* This is -1 until the first suspend. */
  	int signal;
  	/* FIXME: kill this, we only use signals on systems that have rt-posix, which doesn't have issues with duplicates. */
  	unsigned int stop_count; /* to catch duplicate signals. */
  #endif
  
  	gpointer runtime_data;
  
  	void *stack_end;
  	void *stack_start;
  	void *stack_start_limit;
  
  	/*FIXME pretty please finish killing ARCH_NUM_REGS */
  #ifdef USE_MONO_CTX
  	MonoContext ctx;		/* ditto */
  #else
  	gpointer regs[ARCH_NUM_REGS];	    /* ditto */
  #endif
  };
  
  #else
  
  #include "metadata/profiler-private.h"
  #include "utils/dtrace.h"
  #include "utils/mono-counters.h"
  #include "utils/mono-logger-internals.h"
  #include "utils/mono-time.h"
  #include "utils/mono-os-semaphore.h"
  #include "metadata/sgen-bridge-internals.h"
  
  extern void mono_sgen_register_moved_object (void *obj, void *destination);
  extern void mono_sgen_gc_event_moves (void);
  
  extern void mono_sgen_init_stw (void);
  
  enum {
  	INTERNAL_MEM_EPHEMERON_LINK = INTERNAL_MEM_FIRST_CLIENT,
  	INTERNAL_MEM_MAX
  };
  
  static inline mword
  sgen_mono_array_size (GCVTable vtable, MonoArray *array, mword *bounds_size, mword descr)
  {
  	mword size, size_without_bounds;
  	int element_size;
  
  	if ((descr & DESC_TYPE_MASK) == DESC_TYPE_VECTOR)
  		element_size = ((descr) >> VECTOR_ELSIZE_SHIFT) & MAX_ELEMENT_SIZE;
  	else
  		element_size = vtable->klass->sizes.element_size;
  
  	size_without_bounds = size = MONO_SIZEOF_MONO_ARRAY + element_size * mono_array_length_fast (array);
  
  	if (G_UNLIKELY (array->bounds)) {
  		size += sizeof (mono_array_size_t) - 1;
  		size &= ~(sizeof (mono_array_size_t) - 1);
  		size += sizeof (MonoArrayBounds) * vtable->klass->rank;
  	}
  
  	if (bounds_size)
  		*bounds_size = size - size_without_bounds;
  	return size;
  }
  
  #define SGEN_CLIENT_OBJECT_HEADER_SIZE		(sizeof (GCObject))
  #define SGEN_CLIENT_MINIMUM_OBJECT_SIZE		SGEN_CLIENT_OBJECT_HEADER_SIZE
  
  static mword /*__attribute__((noinline)) not sure if this hint is a good idea*/
  sgen_client_slow_object_get_size (GCVTable vtable, GCObject* o)
  {
  	MonoClass *klass = ((MonoVTable*)vtable)->klass;
  
  	/*
  	 * We depend on mono_string_length_fast and
  	 * mono_array_length_fast not using the object's vtable.
  	 */
  	if (klass == mono_defaults.string_class) {
  		return G_STRUCT_OFFSET (MonoString, chars) + 2 * mono_string_length_fast ((MonoString*) o) + 2;
  	} else if (klass->rank) {
  		return sgen_mono_array_size (vtable, (MonoArray*)o, NULL, 0);
  	} else {
  		/* from a created object: the class must be inited already */
  		return klass->instance_size;
  	}
  }
  
  /*
   * This function can be called on an object whose first word, the
   * vtable field, is not intact.  This is necessary for the parallel
   * collector.
   */
  static MONO_NEVER_INLINE mword
  sgen_client_par_object_get_size (GCVTable vtable, GCObject* o)
  {
  	SgenDescriptor descr = sgen_vtable_get_descriptor (vtable);
  	mword type = descr & DESC_TYPE_MASK;
  
  	if (type == DESC_TYPE_RUN_LENGTH || type == DESC_TYPE_SMALL_PTRFREE) {
  		mword size = descr & 0xfff8;
  		SGEN_ASSERT (9, size >= sizeof (MonoObject), "Run length object size to small");
  		return size;
  	} else if (descr == SGEN_DESC_STRING) {
  		return G_STRUCT_OFFSET (MonoString, chars) + 2 * mono_string_length_fast ((MonoString*) o) + 2;
  	} else if (type == DESC_TYPE_VECTOR) {
  		return sgen_mono_array_size (vtable, (MonoArray*)o, NULL, descr);
  	}
  
  	return sgen_client_slow_object_get_size (vtable, o);
  }
  
  static MONO_ALWAYS_INLINE size_t G_GNUC_UNUSED
  sgen_client_array_element_size (GCVTable gc_vtable)
  {
  	MonoVTable *vt = (MonoVTable*)gc_vtable;
  	return mono_array_element_size (vt->klass);
  }
  
  static MONO_ALWAYS_INLINE G_GNUC_UNUSED char*
  sgen_client_array_data_start (GCObject *obj)
  {
  	return (char*)(obj) +  G_STRUCT_OFFSET (MonoArray, vector);
  }
  
  static MONO_ALWAYS_INLINE size_t G_GNUC_UNUSED
  sgen_client_array_length (GCObject *obj)
  {
  	return mono_array_length_fast ((MonoArray*)obj);
  }
  
  static MONO_ALWAYS_INLINE gboolean G_GNUC_UNUSED
  sgen_client_object_is_array_fill (GCObject *o)
  {
  	return ((MonoObject*)o)->synchronisation == GINT_TO_POINTER (-1);
  }
  
  static MONO_ALWAYS_INLINE void G_GNUC_UNUSED
  sgen_client_pre_copy_checks (char *destination, GCVTable gc_vtable, void *obj, mword objsize)
  {
  	MonoVTable *vt = (MonoVTable*)gc_vtable;
  	SGEN_ASSERT (9, vt->klass->inited, "vtable %p for class %s:%s was not initialized", vt, vt->klass->name_space, vt->klass->name);
  }
  
  static MONO_ALWAYS_INLINE void G_GNUC_UNUSED
  sgen_client_update_copied_object (char *destination, GCVTable gc_vtable, void *obj, mword objsize)
  {
  	MonoVTable *vt = (MonoVTable*)gc_vtable;
  	if (G_UNLIKELY (vt->rank && ((MonoArray*)obj)->bounds)) {
  		MonoArray *array = (MonoArray*)destination;
  		array->bounds = (MonoArrayBounds*)((char*)destination + ((char*)((MonoArray*)obj)->bounds - (char*)obj));
  		SGEN_LOG (9, "Array instance %p: size: %lu, rank: %d, length: %lu", array, (unsigned long)objsize, vt->rank, (unsigned long)mono_array_length (array));
  	}
  
  	if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_GC_MOVES))
  		mono_sgen_register_moved_object (obj, destination);
  }
  
  #ifdef XDOMAIN_CHECKS_IN_WBARRIER
  extern gboolean sgen_mono_xdomain_checks;
  
  #define sgen_client_wbarrier_generic_nostore_check(ptr) do {		\
  		/* FIXME: ptr_in_heap must be called with the GC lock held */ \
  		if (sgen_mono_xdomain_checks && *(MonoObject**)ptr && ptr_in_heap (ptr)) { \
  			char *start = find_object_for_ptr (ptr);	\
  			MonoObject *value = *(MonoObject**)ptr;		\
  			LOCK_GC;					\
  			SGEN_ASSERT (0, start, "Write barrier outside an object?"); \
  			if (start) {					\
  				MonoObject *obj = (MonoObject*)start;	\
  				if (obj->vtable->domain != value->vtable->domain) \
  					SGEN_ASSERT (0, is_xdomain_ref_allowed (ptr, start, obj->vtable->domain), "Cross-domain ref not allowed"); \
  			}						\
  			UNLOCK_GC;					\
  		}							\
  	} while (0)
  #else
  #define sgen_client_wbarrier_generic_nostore_check(ptr)
  #endif
  
  static gboolean G_GNUC_UNUSED
  sgen_client_object_has_critical_finalizer (GCObject *obj)
  {
  	MonoClass *klass;
  
  	if (!mono_defaults.critical_finalizer_object)
  		return FALSE;
  
  	klass = SGEN_LOAD_VTABLE (obj)->klass;
  
  	return mono_class_has_parent_fast (klass, mono_defaults.critical_finalizer_object);
  }
  
  const char* sgen_client_vtable_get_namespace (GCVTable vtable);
  const char* sgen_client_vtable_get_name (GCVTable vtable);
  
  static gboolean G_GNUC_UNUSED
  sgen_client_bridge_need_processing (void)
  {
  	return sgen_need_bridge_processing ();
  }
  
  static void G_GNUC_UNUSED
  sgen_client_bridge_reset_data (void)
  {
  	sgen_bridge_reset_data ();
  }
  
  static void G_GNUC_UNUSED
  sgen_client_bridge_processing_stw_step (void)
  {
  	sgen_bridge_processing_stw_step ();
  }
  
  static void G_GNUC_UNUSED
  sgen_client_bridge_wait_for_processing (void)
  {
  	mono_gc_wait_for_bridge_processing ();
  }
  
  static void G_GNUC_UNUSED
  sgen_client_bridge_processing_finish (int generation)
  {
  	sgen_bridge_processing_finish (generation);
  }
  
  static gboolean G_GNUC_UNUSED
  sgen_client_bridge_is_bridge_object (GCObject *obj)
  {
  	return sgen_is_bridge_object (obj);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_bridge_register_finalized_object (GCObject *object)
  {
  	sgen_bridge_register_finalized_object (object);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_collection_requested (int generation, size_t requested_size, gboolean force)
  {
  	MONO_GC_REQUESTED (generation, requested_size, force);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_collection_begin (int minor_gc_count, int generation)
  {
  	MONO_GC_BEGIN (generation);
  
  	mono_profiler_gc_event (MONO_GC_EVENT_START, generation);
  
  #ifndef DISABLE_PERFCOUNTERS
  	if (generation == GENERATION_NURSERY)
  		mono_perfcounters->gc_collections0++;
  	else
  		mono_perfcounters->gc_collections1++;
  #endif
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_collection_end (int minor_gc_count, int generation, long long num_objects_scanned, long long num_unique_objects_scanned)
  {
  	MONO_GC_END (generation);
  
  	mono_profiler_gc_event (MONO_GC_EVENT_END, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_concurrent_start (void)
  {
  	MONO_GC_CONCURRENT_START_BEGIN (GENERATION_OLD);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_concurrent_update (void)
  {
  	MONO_GC_CONCURRENT_UPDATE_FINISH_BEGIN (GENERATION_OLD, sgen_get_major_collector ()->get_and_reset_num_major_objects_marked ());
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_concurrent_finish (void)
  {
  	MONO_GC_CONCURRENT_UPDATE_FINISH_BEGIN (GENERATION_OLD, sgen_get_major_collector ()->get_and_reset_num_major_objects_marked ());
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_sweep_begin (int generation, int full_sweep)
  {
  	MONO_GC_SWEEP_BEGIN (generation, full_sweep);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_sweep_end (int generation, int full_sweep)
  {
  	MONO_GC_SWEEP_END (generation, full_sweep);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_world_stopping (int generation, long long timestamp, gpointer thread)
  {
  	MONO_GC_WORLD_STOP_BEGIN ();
  
  	mono_profiler_gc_event (MONO_GC_EVENT_PRE_STOP_WORLD, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_world_stopped (int generation, long long timestamp, long long total_major_cards, long long marked_major_cards, long long total_los_cards, long long marked_los_cards)
  {
  	MONO_GC_WORLD_STOP_END ();
  
  	mono_profiler_gc_event (MONO_GC_EVENT_POST_STOP_WORLD, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_world_restarting (int generation, long long timestamp, long long total_major_cards, long long marked_major_cards, long long total_los_cards, long long marked_los_cards)
  {
  	MONO_GC_WORLD_RESTART_BEGIN (generation);
  
  	mono_profiler_gc_event (MONO_GC_EVENT_PRE_START_WORLD, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_world_restarted (int generation, long long timestamp)
  {
  	MONO_GC_WORLD_RESTART_END (generation);
  
  	mono_profiler_gc_event (MONO_GC_EVENT_POST_START_WORLD, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_block_alloc (gpointer addr, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_block_free (gpointer addr, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_block_set_state (gpointer addr, size_t size, int old, int new)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_mark_start (int generation)
  {
  	mono_profiler_gc_event (MONO_GC_EVENT_MARK_START, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_mark_end (int generation)
  {
  	mono_profiler_gc_event (MONO_GC_EVENT_MARK_END, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_reclaim_start (int generation)
  {
  	mono_profiler_gc_event (MONO_GC_EVENT_RECLAIM_START, generation);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_reclaim_end (int generation)
  {
  	mono_profiler_gc_event (MONO_GC_EVENT_RECLAIM_END, generation);
  }
  
  static void
  mono_binary_protocol_alloc_generic (gpointer obj, gpointer vtable, size_t size, gboolean pinned)
  {
  #ifdef ENABLE_DTRACE
  	const char *namespace = sgen_client_vtable_get_namespace (vtable);
  	const char *name = sgen_client_vtable_get_name (vtable);
  
  	if (sgen_ptr_in_nursery (obj)) {
  		if (G_UNLIKELY (MONO_GC_NURSERY_OBJ_ALLOC_ENABLED ()))
  			MONO_GC_NURSERY_OBJ_ALLOC ((mword)obj, size, namespace, name);
  	} else {
  		if (size > SGEN_MAX_SMALL_OBJ_SIZE) {
  			if (G_UNLIKELY (MONO_GC_MAJOR_OBJ_ALLOC_LARGE_ENABLED ()))
  				MONO_GC_MAJOR_OBJ_ALLOC_LARGE ((mword)obj, size, namespace, name);
  		} else if (pinned) {
  			MONO_GC_MAJOR_OBJ_ALLOC_PINNED ((mword)obj, size, namespace, name);
  		}
  	}
  #endif
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_alloc (gpointer obj, gpointer vtable, size_t size, gpointer provenance)
  {
  	mono_binary_protocol_alloc_generic (obj, vtable, size, FALSE);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_alloc_pinned (gpointer obj, gpointer vtable, size_t size, gpointer provenance)
  {
  	mono_binary_protocol_alloc_generic (obj, vtable, size, TRUE);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_alloc_degraded (gpointer obj, gpointer vtable, size_t size, gpointer provenance)
  {
  	MONO_GC_MAJOR_OBJ_ALLOC_DEGRADED ((mword)obj, size, sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_card_scan (gpointer start, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_pin_stage (gpointer addr_ptr, gpointer addr)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_cement_stage (gpointer addr)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_pin (gpointer obj, gpointer vtable, size_t size)
  {
  #ifdef ENABLE_DTRACE
  	if (G_UNLIKELY (MONO_GC_OBJ_PINNED_ENABLED ())) {
  		int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
  		MONO_GC_OBJ_PINNED ((mword)obj,
  				sgen_safe_object_get_size (obj),
  				sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable), gen);
  	}
  #endif
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_mark (gpointer obj, gpointer vtable, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_scan_begin (gpointer obj, gpointer vtable, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_scan_vtype_begin (gpointer obj, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_scan_process_reference (gpointer obj, gpointer ptr, gpointer value)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_scan_stack (gpointer thread, gpointer stack_start, gpointer stack_end, int skip_reason)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_wbarrier (gpointer ptr, gpointer value, gpointer value_vtable)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_cement (gpointer ptr, gpointer vtable, size_t size)
  {
  #ifdef ENABLE_DTRACE
  	if (G_UNLIKELY (MONO_GC_OBJ_CEMENTED_ENABLED())) {
  		MONO_GC_OBJ_CEMENTED ((mword)ptr, sgen_safe_object_get_size ((GCObject*)ptr),
  				sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
  	}
  #endif
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_copy (gpointer from, gpointer to, gpointer vtable, size_t size)
  {
  #ifdef ENABLE_DTRACE
  	if (G_UNLIKELY (MONO_GC_OBJ_MOVED_ENABLED ())) {
  		int dest_gen = sgen_ptr_in_nursery (to) ? GENERATION_NURSERY : GENERATION_OLD;
  		int src_gen = sgen_ptr_in_nursery (from) ? GENERATION_NURSERY : GENERATION_OLD;
  		MONO_GC_OBJ_MOVED ((mword)to, (mword)from, dest_gen, src_gen, size, sgen_client_vtable_get_namespace (vtable), sgen_client_vtable_get_name (vtable));
  	}
  #endif
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_global_remset (gpointer ptr, gpointer value, gpointer value_vtable)
  {
  #ifdef ENABLE_DTRACE
  	if (G_UNLIKELY (MONO_GC_GLOBAL_REMSET_ADD_ENABLED ())) {
  		MONO_GC_GLOBAL_REMSET_ADD ((mword)ptr, (mword)value, sgen_safe_object_get_size (value),
  				sgen_client_vtable_get_namespace (value_vtable), sgen_client_vtable_get_name (value_vtable));
  	}
  #endif
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_mod_union_remset (gpointer obj, gpointer ptr, gpointer value, gpointer value_vtable)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_ptr_update (gpointer ptr, gpointer old_value, gpointer new_value, gpointer vtable, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_cleanup (gpointer ptr, gpointer vtable, size_t size)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_dislink_add (gpointer link, gpointer obj, gboolean track)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_dislink_update (gpointer link, gpointer obj, gboolean track)
  {
  #ifdef ENABLE_DTRACE
  	if (MONO_GC_WEAK_UPDATE_ENABLED ()) {
  		GCVTable vt = obj ? SGEN_LOAD_VTABLE (obj) : NULL;
  		MONO_GC_WEAK_UPDATE ((mword)link,
  				(mword)obj,
  				obj ? (mword)sgen_safe_object_get_size (obj) : (mword)0,
  				obj ? sgen_client_vtable_get_namespace (vt) : NULL,
  				obj ? sgen_client_vtable_get_name (vt) : NULL,
  				track ? 1 : 0);
  	}
  #endif
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_dislink_remove (gpointer link, gboolean track)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_empty (gpointer start, size_t size)
  {
  	if (sgen_ptr_in_nursery (start))
  		MONO_GC_NURSERY_SWEPT ((mword)start, size);
  	else
  		MONO_GC_MAJOR_SWEPT ((mword)start, size);
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_thread_suspend (gpointer thread, gpointer stopped_ip)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_thread_restart (gpointer thread)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_thread_register (gpointer thread)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_thread_unregister (gpointer thread)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_missing_remset (gpointer obj, gpointer obj_vtable, int offset, gpointer value, gpointer value_vtable, gboolean value_pinned)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_cement_reset (void)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_domain_unload_begin (gpointer domain)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_domain_unload_end (gpointer domain)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_gray_enqueue (gpointer queue, gpointer cursor, gpointer value)
  {
  }
  
  static void G_GNUC_UNUSED
  sgen_client_binary_protocol_gray_dequeue (gpointer queue, gpointer cursor, gpointer value)
  {
  }
  
  int sgen_thread_handshake (BOOL suspend);
  gboolean sgen_suspend_thread (SgenThreadInfo *info);
  gboolean sgen_resume_thread (SgenThreadInfo *info);
  void sgen_wait_for_suspend_ack (int count);
  
  #ifdef HAVE_KW_THREAD
  extern __thread SgenThreadInfo *sgen_thread_info;
  #define TLAB_ACCESS_INIT
  #define IN_CRITICAL_REGION sgen_thread_info->client_info.in_critical_region
  #else
  extern MonoNativeTlsKey thread_info_key;
  #define TLAB_ACCESS_INIT	SgenThreadInfo *__thread_info__ = mono_native_tls_get_value (thread_info_key)
  #define IN_CRITICAL_REGION (__thread_info__->client_info.in_critical_region)
  #endif
  
  #ifndef DISABLE_CRITICAL_REGION
  
  #ifdef HAVE_KW_THREAD
  #define IN_CRITICAL_REGION sgen_thread_info->client_info.in_critical_region
  #else
  #define IN_CRITICAL_REGION (__thread_info__->client_info.in_critical_region)
  #endif
  
  /* Enter must be visible before anything is done in the critical region. */
  #define ENTER_CRITICAL_REGION do { mono_atomic_store_acquire (&IN_CRITICAL_REGION, 1); } while (0)
  
  /* Exit must make sure all critical regions stores are visible before it signal the end of the region. 
   * We don't need to emit a full barrier since we
   */
  #define EXIT_CRITICAL_REGION  do { mono_atomic_store_release (&IN_CRITICAL_REGION, 0); } while (0)
  
  #endif
  
  #define SGEN_TV_DECLARE(name) gint64 name
  #define SGEN_TV_GETTIME(tv) tv = mono_100ns_ticks ()
  #define SGEN_TV_ELAPSED(start,end) ((long)(end-start))
  
  typedef MonoSemType SgenSemaphore;
  
  #define SGEN_SEMAPHORE_INIT(sem,initial)	mono_os_sem_init ((sem), (initial))
  #define SGEN_SEMAPHORE_POST(sem)		mono_os_sem_post ((sem))
  #define SGEN_SEMAPHORE_WAIT(sem)		mono_os_sem_wait ((sem), MONO_SEM_FLAGS_NONE)
  
  gboolean sgen_has_critical_method (void);
  gboolean sgen_is_critical_method (MonoMethod *method);
  
  void sgen_set_use_managed_allocator (gboolean flag);
  gboolean sgen_is_managed_allocator (MonoMethod *method);
  gboolean sgen_has_managed_allocator (void);
  
  void sgen_scan_for_registered_roots_in_domain (MonoDomain *domain, int root_type);
  void sgen_null_links_for_domain (MonoDomain *domain);
  
  #endif
  