-/*
- * sgen-gc.c: Simple generational GC.
+/**
+ * \file
+ * Simple generational GC.
*
* Copyright 2001-2003 Ximian, Inc
* Copyright 2003-2010 Novell, Inc.
#include "mono/utils/atomic.h"
#include "mono/utils/mono-os-mutex.h"
#include "mono/utils/mono-coop-mutex.h"
+#include "mono/utils/ward.h"
#include "mono/sgen/sgen-conf.h"
#include "mono/sgen/sgen-hash-table.h"
#include "mono/sgen/sgen-protocol.h"
#include "mono/sgen/gc-internal-agnostic.h"
+#include "mono/sgen/sgen-thread-pool.h"
/* The method used to clear the nursery */
/* Clearing at nursery collections is the safest, but has bad interactions with caches.
typedef struct _GCMemSection GCMemSection;
struct _GCMemSection {
char *data;
- mword size;
- /* pointer where more data could be allocated if it fits */
- char *next_data;
char *end_data;
/*
* scan starts is an array of pointers to objects equally spaced in the allocation area
g_error (__VA_ARGS__); \
} } while (0)
-#ifndef HOST_WIN32
+#ifdef HAVE_LOCALTIME_R
# define LOG_TIMESTAMP \
do { \
time_t t; \
#define SGEN_PTR_IN_NURSERY(p,bits,start,end) (((mword)(p) & ~(((mword)1 << (bits)) - 1)) == (mword)(start))
-#ifdef USER_CONFIG
-
-/* good sizes are 512KB-1MB: larger ones increase a lot memzeroing time */
-#define DEFAULT_NURSERY_SIZE (sgen_nursery_size)
extern size_t sgen_nursery_size;
-/* The number of trailing 0 bits in DEFAULT_NURSERY_SIZE */
-#define DEFAULT_NURSERY_BITS (sgen_nursery_bits)
+extern size_t sgen_nursery_max_size;
extern int sgen_nursery_bits;
-#else
-
-#define DEFAULT_NURSERY_SIZE (4*1024*1024)
-#define DEFAULT_NURSERY_BITS 22
-
-#endif
-
extern char *sgen_nursery_start;
extern char *sgen_nursery_end;
static inline MONO_ALWAYS_INLINE gboolean
sgen_ptr_in_nursery (void *p)
{
- return SGEN_PTR_IN_NURSERY ((p), DEFAULT_NURSERY_BITS, sgen_nursery_start, sgen_nursery_end);
+ return SGEN_PTR_IN_NURSERY ((p), sgen_nursery_bits, sgen_nursery_start, sgen_nursery_end);
}
static inline MONO_ALWAYS_INLINE char*
#define SGEN_POINTER_UNTAG_VTABLE(p) SGEN_POINTER_UNTAG_ALL((p))
/* returns NULL if not forwarded, or the forwarded address */
-#define SGEN_VTABLE_IS_FORWARDED(vtable) ((GCVTable *)(SGEN_POINTER_IS_TAGGED_FORWARDED ((vtable)) ? SGEN_POINTER_UNTAG_VTABLE ((vtable)) : NULL))
+#define SGEN_VTABLE_IS_FORWARDED(vtable) ((GCObject *)(SGEN_POINTER_IS_TAGGED_FORWARDED ((vtable)) ? SGEN_POINTER_UNTAG_VTABLE ((vtable)) : NULL))
#define SGEN_OBJECT_IS_FORWARDED(obj) ((GCObject *)SGEN_VTABLE_IS_FORWARDED (((mword*)(obj))[0]))
#define SGEN_VTABLE_IS_PINNED(vtable) SGEN_POINTER_IS_TAGGED_PINNED ((vtable))
#define SGEN_FORWARD_OBJECT(obj,fw_addr) do { \
*(void**)(obj) = SGEN_POINTER_TAG_FORWARDED ((fw_addr)); \
} while (0)
+#define SGEN_FORWARD_OBJECT_PAR(obj,fw_addr,final_fw_addr) do { \
+ gpointer old_vtable_word = *(gpointer*)obj; \
+ gpointer new_vtable_word; \
+ final_fw_addr = SGEN_VTABLE_IS_FORWARDED (old_vtable_word); \
+ if (final_fw_addr) \
+ break; \
+ new_vtable_word = SGEN_POINTER_TAG_FORWARDED ((fw_addr)); \
+ old_vtable_word = InterlockedCompareExchangePointer ((gpointer*)obj, new_vtable_word, old_vtable_word); \
+ final_fw_addr = SGEN_VTABLE_IS_FORWARDED (old_vtable_word); \
+ if (!final_fw_addr) \
+ final_fw_addr = (fw_addr); \
+ } while (0)
#define SGEN_PIN_OBJECT(obj) do { \
*(void**)(obj) = SGEN_POINTER_TAG_PINNED (*(void**)(obj)); \
} while (0)
SGEN_GC_BIT_FINALIZER_AWARE = 4,
};
-void sgen_gc_init (void);
+void sgen_gc_init (void)
+ MONO_PERMIT (need (sgen_lock_gc));
void sgen_os_init (void);
extern SgenHashTable roots_hash [ROOT_TYPE_NUM];
-int sgen_register_root (char *start, size_t size, SgenDescriptor descr, int root_type, int source, const char *msg);
-void sgen_deregister_root (char* addr);
+int sgen_register_root (char *start, size_t size, SgenDescriptor descr, int root_type, int source, const char *msg)
+ MONO_PERMIT (need (sgen_lock_gc));
+void sgen_deregister_root (char* addr)
+ MONO_PERMIT (need (sgen_lock_gc));
typedef void (*IterateObjectCallbackFunc) (GCObject*, size_t, void*);
void sgen_fragment_allocator_add (SgenFragmentAllocator *allocator, char *start, char *end);
void sgen_fragment_allocator_release (SgenFragmentAllocator *allocator);
-void* sgen_fragment_allocator_serial_alloc (SgenFragmentAllocator *allocator, size_t size);
void* sgen_fragment_allocator_par_alloc (SgenFragmentAllocator *allocator, size_t size);
void* sgen_fragment_allocator_serial_range_alloc (SgenFragmentAllocator *allocator, size_t desired_size, size_t minimum_size, size_t *out_alloc_size);
void* sgen_fragment_allocator_par_range_alloc (SgenFragmentAllocator *allocator, size_t desired_size, size_t minimum_size, size_t *out_alloc_size);
typedef struct {
gboolean is_split;
+ gboolean is_parallel;
GCObject* (*alloc_for_promotion) (GCVTable vtable, GCObject *obj, size_t objsize, gboolean has_references);
+ GCObject* (*alloc_for_promotion_par) (GCVTable vtable, GCObject *obj, size_t objsize, gboolean has_references);
SgenObjectOperations serial_ops;
SgenObjectOperations serial_ops_with_concurrent_major;
+ SgenObjectOperations parallel_ops;
+ SgenObjectOperations parallel_ops_with_concurrent_major;
void (*prepare_to_space) (char *to_space_bitmap, size_t space_bitmap_size);
void (*clear_fragments) (void);
extern SgenMinorCollector sgen_minor_collector;
-void sgen_simple_nursery_init (SgenMinorCollector *collector);
+void sgen_simple_nursery_init (SgenMinorCollector *collector, gboolean parallel);
void sgen_split_nursery_init (SgenMinorCollector *collector);
/* Updating references */
{
if (!allow_null)
SGEN_ASSERT (0, o, "Cannot update a reference with a NULL pointer");
- SGEN_ASSERT (0, !sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ()), "Can't update a reference in the worker thread");
+ SGEN_ASSERT (0, !sgen_workers_is_worker_thread (mono_native_thread_id_get ()), "Can't update a reference in the worker thread");
*p = o;
}
size_t section_size;
gboolean is_concurrent;
gboolean is_parallel;
- gboolean needs_thread_pool;
gboolean supports_cardtable;
gboolean sweeps_lazily;
- void* (*alloc_heap) (mword nursery_size, mword nursery_align, int nursery_bits);
+ void* (*alloc_heap) (mword nursery_size, mword nursery_align);
gboolean (*is_object_live) (GCObject *obj);
GCObject* (*alloc_small_pinned_obj) (GCVTable vtable, size_t size, gboolean has_references);
GCObject* (*alloc_degraded) (GCVTable vtable, size_t size);
SgenObjectOperations major_ops_conc_par_finish;
GCObject* (*alloc_object) (GCVTable vtable, size_t size, gboolean has_references);
+ GCObject* (*alloc_object_par) (GCVTable vtable, size_t size, gboolean has_references);
void (*free_pinned_object) (GCObject *obj, size_t size);
/*
void (*free_non_pinned_object) (GCObject *obj, size_t size);
void (*pin_objects) (SgenGrayQueue *queue);
void (*pin_major_object) (GCObject *obj, SgenGrayQueue *queue);
- void (*scan_card_table) (CardTableScanType scan_type, ScanCopyContext ctx);
+ void (*scan_card_table) (CardTableScanType scan_type, ScanCopyContext ctx, int job_index, int job_split_count, int block_count);
void (*iterate_live_block_ranges) (sgen_cardtable_block_callback callback);
void (*iterate_block_ranges) (sgen_cardtable_block_callback callback);
void (*update_cardtable_mod_union) (void);
guint8* (*get_cardtable_mod_union_for_reference) (char *object);
long long (*get_and_reset_num_major_objects_marked) (void);
void (*count_cards) (long long *num_total_cards, long long *num_marked_cards);
+ void (*init_block_free_lists) (gpointer *list_p);
};
extern SgenMajorCollector major_collector;
void sgen_marksweep_conc_init (SgenMajorCollector *collector);
void sgen_marksweep_conc_par_init (SgenMajorCollector *collector);
SgenMajorCollector* sgen_get_major_collector (void);
+SgenMinorCollector* sgen_get_minor_collector (void);
typedef struct _SgenRememberedSet {
void (*wbarrier_object_copy) (GCObject* obj, GCObject *src);
void (*wbarrier_generic_nostore) (gpointer ptr);
void (*record_pointer) (gpointer ptr);
+ void (*wbarrier_range_copy) (gpointer dest, gpointer src, int count);
- void (*scan_remsets) (ScanCopyContext ctx);
+ void (*start_scan_remsets) (void);
void (*clear_cards) (void);
- void (*finish_minor_collection) (void);
gboolean (*find_address) (char *addr);
gboolean (*find_address_with_cards) (char *cards_start, guint8 *cards, char *addr);
} SgenRememberedSet;
void mono_gc_wbarrier_generic_store (gpointer ptr, GCObject* value);
void mono_gc_wbarrier_generic_store_atomic (gpointer ptr, GCObject *value);
-void sgen_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap);
+void sgen_wbarrier_range_copy (gpointer _dest, gpointer _src, int size);
static inline SgenDescriptor
sgen_obj_get_descriptor (GCObject *obj)
static inline mword
sgen_safe_object_get_size (GCObject *obj)
{
- GCObject *forwarded;
-
- if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj)))
- obj = forwarded;
+ GCObject *forwarded;
+ GCVTable vtable = SGEN_LOAD_VTABLE_UNCHECKED (obj);
- return sgen_client_par_object_get_size (SGEN_LOAD_VTABLE (obj), obj);
+ /*
+ * Once we load the vtable, we must always use it, in case we are in parallel case.
+ * Otherwise the object might get forwarded in the meantime and we would read an
+ * invalid vtable. An object cannot be forwarded for a second time during same GC.
+ */
+ if ((forwarded = SGEN_VTABLE_IS_FORWARDED (vtable)))
+ return sgen_client_par_object_get_size (SGEN_LOAD_VTABLE (forwarded), obj);
+ else
+ return sgen_client_par_object_get_size ((GCVTable)SGEN_POINTER_UNTAG_ALL (vtable), obj);
}
static inline gboolean
void sgen_process_togglerefs (void);
void sgen_register_test_toggleref_callback (void);
-void sgen_mark_bridge_object (GCObject *obj);
-void sgen_collect_bridge_objects (int generation, ScanCopyContext ctx);
+void sgen_mark_bridge_object (GCObject *obj)
+ MONO_PERMIT (need (sgen_gc_locked));
+void sgen_collect_bridge_objects (int generation, ScanCopyContext ctx)
+ MONO_PERMIT (need (sgen_gc_locked));
typedef gboolean (*SgenObjectPredicateFunc) (GCObject *obj, void *user_data);
-void sgen_null_links_if (SgenObjectPredicateFunc predicate, void *data, int generation, gboolean track);
+void sgen_null_links_if (SgenObjectPredicateFunc predicate, void *data, int generation, gboolean track)
+ MONO_PERMIT (need (sgen_gc_locked, sgen_world_stopped));
gboolean sgen_gc_is_object_ready_for_finalization (GCObject *object);
-void sgen_gc_lock (void);
-void sgen_gc_unlock (void);
+void sgen_gc_lock (void) MONO_PERMIT (use (sgen_lock_gc), grant (sgen_gc_locked), revoke (sgen_lock_gc));
+void sgen_gc_unlock (void) MONO_PERMIT (use (sgen_gc_locked), revoke (sgen_gc_locked), grant (sgen_lock_gc));
void sgen_queue_finalization_entry (GCObject *obj);
const char* sgen_generation_name (int generation);
-void sgen_finalize_in_range (int generation, ScanCopyContext ctx);
-void sgen_null_link_in_range (int generation, ScanCopyContext ctx, gboolean track);
-void sgen_process_fin_stage_entries (void);
+void sgen_finalize_in_range (int generation, ScanCopyContext ctx)
+ MONO_PERMIT (need (sgen_gc_locked));
+void sgen_null_link_in_range (int generation, ScanCopyContext ctx, gboolean track)
+ MONO_PERMIT (need (sgen_gc_locked, sgen_world_stopped));
+void sgen_process_fin_stage_entries (void)
+ MONO_PERMIT (need (sgen_gc_locked));
gboolean sgen_have_pending_finalizers (void);
-void sgen_object_register_for_finalization (GCObject *obj, void *user_data);
+void sgen_object_register_for_finalization (GCObject *obj, void *user_data)
+ MONO_PERMIT (need (sgen_lock_gc));
-void sgen_finalize_if (SgenObjectPredicateFunc predicate, void *user_data);
+void sgen_finalize_if (SgenObjectPredicateFunc predicate, void *user_data)
+ MONO_PERMIT (need (sgen_lock_gc));
void sgen_remove_finalizers_if (SgenObjectPredicateFunc predicate, void *user_data, int generation);
void sgen_set_suspend_finalizers (void);
+void sgen_wbroots_iterate_live_block_ranges (sgen_cardtable_block_callback cb);
+void sgen_wbroots_scan_card_table (ScanCopyContext ctx);
+
void sgen_register_disappearing_link (GCObject *obj, void **link, gboolean track, gboolean in_gc);
GCObject* sgen_weak_link_get (void **link_addr);
void sgen_pin_object (GCObject *object, SgenGrayQueue *queue);
void sgen_set_pinned_from_failed_allocation (mword objsize);
-void sgen_ensure_free_space (size_t size, int generation);
-void sgen_gc_collect (int generation);
-void sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish, gboolean stw);
+void sgen_ensure_free_space (size_t size, int generation)
+ MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
+void sgen_gc_collect (int generation)
+ MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
+void sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish, gboolean stw)
+ MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
int sgen_gc_collection_count (int generation);
/* FIXME: what exactly does this return? */
-size_t sgen_gc_get_used_size (void);
+size_t sgen_gc_get_used_size (void)
+ MONO_PERMIT (need (sgen_lock_gc));
size_t sgen_gc_get_total_heap_allocation (void);
/* STW */
-void sgen_stop_world (int generation);
-void sgen_restart_world (int generation);
+void sgen_stop_world (int generation)
+ MONO_PERMIT (need (sgen_gc_locked), use (sgen_stop_world), grant (sgen_world_stopped), revoke (sgen_stop_world));
+void sgen_restart_world (int generation)
+ MONO_PERMIT (need (sgen_gc_locked), use (sgen_world_stopped), revoke (sgen_world_stopped), grant (sgen_stop_world));
gboolean sgen_is_world_stopped (void);
gboolean sgen_set_allow_synchronous_major (gboolean flag);
extern mword los_memory_usage_total;
void sgen_los_free_object (LOSObject *obj);
-void* sgen_los_alloc_large_inner (GCVTable vtable, size_t size);
+void* sgen_los_alloc_large_inner (GCVTable vtable, size_t size)
+ MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
void sgen_los_sweep (void);
gboolean sgen_ptr_is_in_los (char *ptr, char **start);
void sgen_los_iterate_objects (IterateObjectCallbackFunc cb, void *user_data);
void sgen_los_iterate_live_block_ranges (sgen_cardtable_block_callback callback);
-void sgen_los_scan_card_table (CardTableScanType scan_type, ScanCopyContext ctx);
+void sgen_los_scan_card_table (CardTableScanType scan_type, ScanCopyContext ctx, int job_index, int job_split_count);
void sgen_los_update_cardtable_mod_union (void);
void sgen_los_count_cards (long long *num_total_cards, long long *num_marked_cards);
gboolean sgen_los_is_valid_object (char *object);
void sgen_clear_nursery_fragments (void);
void sgen_nursery_allocator_prepare_for_pinning (void);
-void sgen_nursery_allocator_set_nursery_bounds (char *nursery_start, char *nursery_end);
+void sgen_nursery_allocator_set_nursery_bounds (char *nursery_start, size_t min_size, size_t max_size);
+void sgen_resize_nursery (gboolean need_shrink);
mword sgen_build_nursery_fragments (GCMemSection *nursery_section, SgenGrayQueue *unpin_queue);
void sgen_init_nursery_allocator (void);
void sgen_nursery_allocator_init_heavy_stats (void);
void sgen_init_allocator (void);
-char* sgen_nursery_alloc_get_upper_alloc_bound (void);
void* sgen_nursery_alloc (size_t size);
void* sgen_nursery_alloc_range (size_t size, size_t min_size, size_t *out_alloc_size);
gboolean sgen_can_alloc_size (size_t size);
GCObject* sgen_alloc_for_promotion (GCObject *obj, size_t objsize, gboolean has_references);
-GCObject* sgen_alloc_obj_nolock (GCVTable vtable, size_t size);
+GCObject* sgen_alloc_obj_nolock (GCVTable vtable, size_t size)
+ MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
GCObject* sgen_try_alloc_obj_nolock (GCVTable vtable, size_t size);
/* Threads */
-void* sgen_thread_register (SgenThreadInfo* info, void *addr);
-void sgen_thread_unregister (SgenThreadInfo *p);
+void* sgen_thread_attach (SgenThreadInfo* info);
+void sgen_thread_detach_with_lock (SgenThreadInfo *p);
/* Finalization/ephemeron support */
return sgen_major_is_object_alive (object);
}
-int sgen_gc_invoke_finalizers (void);
+int sgen_gc_invoke_finalizers (void)
+ MONO_PERMIT (need (sgen_lock_gc));
/* GC handles */
void sgen_init_gchandles (void);
-void sgen_null_links_if (SgenObjectPredicateFunc predicate, void *data, int generation, gboolean track);
+void sgen_null_links_if (SgenObjectPredicateFunc predicate, void *data, int generation, gboolean track)
+ MONO_PERMIT (need (sgen_gc_locked));
typedef gpointer (*SgenGCHandleIterateCallback) (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user);
-void sgen_gchandle_iterate (GCHandleType handle_type, int max_generation, SgenGCHandleIterateCallback callback, gpointer user);
+guint32 sgen_gchandle_new (GCObject *obj, gboolean pinned);
+guint32 sgen_gchandle_new_weakref (GCObject *obj, gboolean track_resurrection);
+void sgen_gchandle_iterate (GCHandleType handle_type, int max_generation, SgenGCHandleIterateCallback callback, gpointer user)
+ MONO_PERMIT (need (sgen_world_stopped));
void sgen_gchandle_set_target (guint32 gchandle, GCObject *obj);
-void sgen_mark_normal_gc_handles (void *addr, SgenUserMarkFunc mark_func, void *gc_data);
+void sgen_mark_normal_gc_handles (void *addr, SgenUserMarkFunc mark_func, void *gc_data)
+ MONO_PERMIT (need (sgen_world_stopped));
gpointer sgen_gchandle_get_metadata (guint32 gchandle);
+GCObject *sgen_gchandle_get_target (guint32 gchandle);
+void sgen_gchandle_free (guint32 gchandle);
/* Other globals */
extern mword total_allocated_major;
extern volatile gboolean sgen_suspend_finalizers;
extern MonoCoopMutex gc_mutex;
+extern volatile gboolean concurrent_collection_in_progress;
/* Nursery helpers. */
void sgen_clear_tlabs (void);
-GCObject* sgen_alloc_obj (GCVTable vtable, size_t size);
-GCObject* sgen_alloc_obj_pinned (GCVTable vtable, size_t size);
-GCObject* sgen_alloc_obj_mature (GCVTable vtable, size_t size);
+GCObject* sgen_alloc_obj (GCVTable vtable, size_t size)
+ MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
+GCObject* sgen_alloc_obj_pinned (GCVTable vtable, size_t size)
+ MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
+GCObject* sgen_alloc_obj_mature (GCVTable vtable, size_t size)
+ MONO_PERMIT (need (sgen_lock_gc, sgen_stop_world));
/* Debug support */
void sgen_check_mod_union_consistency (void);
void sgen_check_major_refs (void);
void sgen_check_whole_heap (gboolean allow_missing_pinning);
-void sgen_check_whole_heap_stw (void);
+void sgen_check_whole_heap_stw (void)
+ MONO_PERMIT (need (sgen_gc_locked, sgen_stop_world));
void sgen_check_objref (char *obj);
void sgen_check_heap_marked (gboolean nursery_must_be_pinned);
void sgen_check_nursery_objects_pinned (gboolean pinned);
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