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Merge pull request #2202 from mono/revert-2090-mono-4.2.0-branch-bug25480
[mono-project.git] / mono / metadata / sgen-mono.c
blobb836a839b916e275dd3e7bad315aec93cf78a337
1 /*
2 * sgen-mono.c: SGen features specific to Mono.
3 *
4 * Copyright (C) 2014 Xamarin Inc
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License 2.0 as published by the Free Software Foundation;
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License 2.0 along with this library; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20 #include "config.h"
21 #ifdef HAVE_SGEN_GC
22
23 #include "sgen/sgen-gc.h"
24 #include "sgen/sgen-protocol.h"
25 #include "metadata/monitor.h"
26 #include "sgen/sgen-layout-stats.h"
27 #include "sgen/sgen-client.h"
28 #include "sgen/sgen-cardtable.h"
29 #include "sgen/sgen-pinning.h"
30 #include "metadata/marshal.h"
31 #include "metadata/method-builder.h"
32 #include "metadata/abi-details.h"
33 #include "metadata/mono-gc.h"
34 #include "metadata/runtime.h"
35 #include "metadata/sgen-bridge-internal.h"
36 #include "metadata/gc-internal.h"
37 #include "utils/mono-memory-model.h"
38 #include "utils/mono-logger-internal.h"
39
40 #ifdef HEAVY_STATISTICS
41 static guint64 stat_wbarrier_set_arrayref = 0;
42 static guint64 stat_wbarrier_value_copy = 0;
43 static guint64 stat_wbarrier_object_copy = 0;
44
45 static guint64 los_marked_cards;
46 static guint64 los_array_cards;
47 static guint64 los_array_remsets;
48 #endif
49
50 /* If set, mark stacks conservatively, even if precise marking is possible */
51 static gboolean conservative_stack_mark = FALSE;
52 /* If set, check that there are no references to the domain left at domain unload */
53 gboolean sgen_mono_xdomain_checks = FALSE;
54
55 /* Functions supplied by the runtime to be called by the GC */
56 static MonoGCCallbacks gc_callbacks;
57
58 #ifdef HAVE_KW_THREAD
59 __thread SgenThreadInfo *sgen_thread_info;
60 #else
61 MonoNativeTlsKey thread_info_key;
62 #endif
63
64 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
65
66 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
67 a = i,
68
69 enum {
70 #include "mono/cil/opcode.def"
71 CEE_LAST
72 };
73
74 #undef OPDEF
75
76 /*
77 * Write barriers
78 */
79
80 static gboolean
81 ptr_on_stack (void *ptr)
82 {
83 gpointer stack_start = &stack_start;
84 SgenThreadInfo *info = mono_thread_info_current ();
85
86 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
87 return TRUE;
88 return FALSE;
89 }
90
91 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
92 #undef HANDLE_PTR
93 #define HANDLE_PTR(ptr,obj) do { \
94 gpointer o = *(gpointer*)(ptr); \
95 if ((o)) { \
96 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
97 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
98 } \
99 } while (0)
100
101 static void
102 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
103 {
104 #define SCAN_OBJECT_NOVTABLE
105 #include "sgen/sgen-scan-object.h"
106 }
107 #endif
108
109 void
110 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
111 {
112 HEAVY_STAT (++stat_wbarrier_value_copy);
113 g_assert (klass->valuetype);
114
115 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, (gpointer)klass->gc_descr, klass->name, klass);
116
117 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
118 size_t element_size = mono_class_value_size (klass, NULL);
119 size_t size = count * element_size;
120 mono_gc_memmove_atomic (dest, src, size);
121 return;
122 }
123
124 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
125 if (binary_protocol_is_heavy_enabled ()) {
126 size_t element_size = mono_class_value_size (klass, NULL);
127 int i;
128 for (i = 0; i < count; ++i) {
129 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
130 (char*)src + i * element_size - sizeof (MonoObject),
131 (mword) klass->gc_descr);
132 }
133 }
134 #endif
135
136 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
137 }
138
139 /**
140 * mono_gc_wbarrier_object_copy:
141 *
142 * Write barrier to call when obj is the result of a clone or copy of an object.
143 */
144 void
145 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
146 {
147 int size;
148
149 HEAVY_STAT (++stat_wbarrier_object_copy);
150
151 if (sgen_ptr_in_nursery (obj) || ptr_on_stack (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
152 size = mono_object_class (obj)->instance_size;
153 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
154 size - sizeof (MonoObject));
155 return;
156 }
157
158 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
159 if (binary_protocol_is_heavy_enabled ())
160 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
161 #endif
162
163 sgen_get_remset ()->wbarrier_object_copy (obj, src);
164 }
165
166 void
167 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
168 {
169 HEAVY_STAT (++stat_wbarrier_set_arrayref);
170 if (sgen_ptr_in_nursery (slot_ptr)) {
171 *(void**)slot_ptr = value;
172 return;
173 }
174 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
175 if (value)
176 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
177
178 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
179 }
180
181 void
182 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
183 {
184 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
185 }
186
187 void
188 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
189 {
190 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
191 }
192
193 static MonoMethod *write_barrier_conc_method;
194 static MonoMethod *write_barrier_noconc_method;
195
196 gboolean
197 sgen_is_critical_method (MonoMethod *method)
198 {
199 return (method == write_barrier_conc_method || method == write_barrier_noconc_method || sgen_is_managed_allocator (method));
200 }
201
202 gboolean
203 sgen_has_critical_method (void)
204 {
205 return write_barrier_conc_method || write_barrier_noconc_method || sgen_has_managed_allocator ();
206 }
207
208 #ifndef DISABLE_JIT
209
210 static void
211 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
212 {
213 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
214
215 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
216 // if (ptr_in_nursery (ptr)) return;
217 /*
218 * Masking out the bits might be faster, but we would have to use 64 bit
219 * immediates, which might be slower.
220 */
221 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
222 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
223 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
224 mono_mb_emit_byte (mb, CEE_SHR_UN);
225 mono_mb_emit_stloc (mb, shifted_nursery_start);
226
227 mono_mb_emit_ldarg (mb, 0);
228 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
229 mono_mb_emit_byte (mb, CEE_SHR_UN);
230 mono_mb_emit_ldloc (mb, shifted_nursery_start);
231 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
232
233 if (!is_concurrent) {
234 // if (!ptr_in_nursery (*ptr)) return;
235 mono_mb_emit_ldarg (mb, 0);
236 mono_mb_emit_byte (mb, CEE_LDIND_I);
237 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
238 mono_mb_emit_byte (mb, CEE_SHR_UN);
239 mono_mb_emit_ldloc (mb, shifted_nursery_start);
240 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
241 }
242 }
243 #endif
244
245 MonoMethod*
246 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
247 {
248 MonoMethod *res;
249 MonoMethodBuilder *mb;
250 MonoMethodSignature *sig;
251 MonoMethod **write_barrier_method_addr;
252 #ifdef MANAGED_WBARRIER
253 int i, nursery_check_labels [2];
254 #endif
255
256 // FIXME: Maybe create a separate version for ctors (the branch would be
257 // correctly predicted more times)
258 if (is_concurrent)
259 write_barrier_method_addr = &write_barrier_conc_method;
260 else
261 write_barrier_method_addr = &write_barrier_noconc_method;
262
263 if (*write_barrier_method_addr)
264 return *write_barrier_method_addr;
265
266 /* Create the IL version of mono_gc_barrier_generic_store () */
267 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
268 sig->ret = &mono_defaults.void_class->byval_arg;
269 sig->params [0] = &mono_defaults.int_class->byval_arg;
270
271 if (is_concurrent)
272 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
273 else
274 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
275
276 #ifndef DISABLE_JIT
277 #ifdef MANAGED_WBARRIER
278 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
279 /*
280 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
281 *addr = 1;
282
283 sgen_cardtable:
284 LDC_PTR sgen_cardtable
285
286 address >> CARD_BITS
287 LDARG_0
288 LDC_I4 CARD_BITS
289 SHR_UN
290 if (SGEN_HAVE_OVERLAPPING_CARDS) {
291 LDC_PTR card_table_mask
292 AND
293 }
294 AND
295 ldc_i4_1
296 stind_i1
297 */
298 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
299 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
300 mono_mb_emit_ldarg (mb, 0);
301 mono_mb_emit_icon (mb, CARD_BITS);
302 mono_mb_emit_byte (mb, CEE_SHR_UN);
303 mono_mb_emit_byte (mb, CEE_CONV_I);
304 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
305 #if SIZEOF_VOID_P == 8
306 mono_mb_emit_icon8 (mb, CARD_MASK);
307 #else
308 mono_mb_emit_icon (mb, CARD_MASK);
309 #endif
310 mono_mb_emit_byte (mb, CEE_CONV_I);
311 mono_mb_emit_byte (mb, CEE_AND);
312 #endif
313 mono_mb_emit_byte (mb, CEE_ADD);
314 mono_mb_emit_icon (mb, 1);
315 mono_mb_emit_byte (mb, CEE_STIND_I1);
316
317 // return;
318 for (i = 0; i < 2; ++i) {
319 if (nursery_check_labels [i])
320 mono_mb_patch_branch (mb, nursery_check_labels [i]);
321 }
322 mono_mb_emit_byte (mb, CEE_RET);
323 #else
324 mono_mb_emit_ldarg (mb, 0);
325 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
326 mono_mb_emit_byte (mb, CEE_RET);
327 #endif
328 #endif
329 res = mono_mb_create_method (mb, sig, 16);
330 mono_mb_free (mb);
331
332 LOCK_GC;
333 if (*write_barrier_method_addr) {
334 /* Already created */
335 mono_free_method (res);
336 } else {
337 /* double-checked locking */
338 mono_memory_barrier ();
339 *write_barrier_method_addr = res;
340 }
341 UNLOCK_GC;
342
343 return *write_barrier_method_addr;
344 }
345
346 MonoMethod*
347 mono_gc_get_write_barrier (void)
348 {
349 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
350 }
351
352 /*
353 * Dummy filler objects
354 */
355
356 /* Vtable of the objects used to fill out nursery fragments before a collection */
357 static GCVTable array_fill_vtable;
358
359 static GCVTable
360 get_array_fill_vtable (void)
361 {
362 if (!array_fill_vtable) {
363 static MonoClass klass;
364 static char _vtable[sizeof(MonoVTable)+8];
365 MonoVTable* vtable = (MonoVTable*) ALIGN_TO(_vtable, 8);
366 gsize bmap;
367
368 MonoDomain *domain = mono_get_root_domain ();
369 g_assert (domain);
370
371 klass.element_class = mono_defaults.byte_class;
372 klass.rank = 1;
373 klass.instance_size = sizeof (MonoArray);
374 klass.sizes.element_size = 1;
375 klass.name = "array_filler_type";
376
377 vtable->klass = &klass;
378 bmap = 0;
379 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
380 vtable->rank = 1;
381
382 array_fill_vtable = vtable;
383 }
384 return array_fill_vtable;
385 }
386
387 gboolean
388 sgen_client_array_fill_range (char *start, size_t size)
389 {
390 MonoArray *o;
391
392 if (size < sizeof (MonoArray)) {
393 memset (start, 0, size);
394 return FALSE;
395 }
396
397 o = (MonoArray*)start;
398 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
399 /* Mark this as not a real object */
400 o->obj.synchronisation = GINT_TO_POINTER (-1);
401 o->bounds = NULL;
402 o->max_length = (mono_array_size_t)(size - sizeof (MonoArray));
403
404 return TRUE;
405 }
406
407 void
408 sgen_client_zero_array_fill_header (void *p, size_t size)
409 {
410 if (size >= sizeof (MonoArray)) {
411 memset (p, 0, sizeof (MonoArray));
412 } else {
413 static guint8 zeros [sizeof (MonoArray)];
414
415 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
416 }
417 }
418
419 /*
420 * Finalization
421 */
422
423 static MonoGCFinalizerCallbacks fin_callbacks;
424
425 guint
426 mono_gc_get_vtable_bits (MonoClass *class)
427 {
428 guint res = 0;
429 /* FIXME move this to the bridge code */
430 if (sgen_need_bridge_processing ()) {
431 switch (sgen_bridge_class_kind (class)) {
432 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
433 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
434 res = SGEN_GC_BIT_BRIDGE_OBJECT;
435 break;
436 case GC_BRIDGE_OPAQUE_CLASS:
437 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
438 break;
439 case GC_BRIDGE_TRANSPARENT_CLASS:
440 break;
441 }
442 }
443 if (fin_callbacks.is_class_finalization_aware) {
444 if (fin_callbacks.is_class_finalization_aware (class))
445 res |= SGEN_GC_BIT_FINALIZER_AWARE;
446 }
447 return res;
448 }
449
450 static gboolean
451 is_finalization_aware (MonoObject *obj)
452 {
453 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
454 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
455 }
456
457 void
458 sgen_client_object_queued_for_finalization (GCObject *obj)
459 {
460 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
461 fin_callbacks.object_queued_for_finalization (obj);
462
463 #ifdef ENABLE_DTRACE
464 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
465 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
466 GCVTable vt = SGEN_LOAD_VTABLE (obj);
467 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
468 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
469 sgen_client_object_has_critical_finalizer (obj));
470 }
471 #endif
472 }
473
474 void
475 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
476 {
477 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
478 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
479
480 fin_callbacks = *callbacks;
481 }
482
483 void
484 sgen_client_run_finalize (MonoObject *obj)
485 {
486 mono_gc_run_finalize (obj, NULL);
487 }
488
489 int
490 mono_gc_invoke_finalizers (void)
491 {
492 return sgen_gc_invoke_finalizers ();
493 }
494
495 gboolean
496 mono_gc_pending_finalizers (void)
497 {
498 return sgen_have_pending_finalizers ();
499 }
500
501 void
502 sgen_client_finalize_notify (void)
503 {
504 mono_gc_finalize_notify ();
505 }
506
507 void
508 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
509 {
510 sgen_object_register_for_finalization (obj, user_data);
511 }
512
513 static gboolean
514 object_in_domain_predicate (MonoObject *obj, void *user_data)
515 {
516 MonoDomain *domain = user_data;
517 if (mono_object_domain (obj) == domain) {
518 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
519 return TRUE;
520 }
521 return FALSE;
522 }
523
524 /**
525 * mono_gc_finalizers_for_domain:
526 * @domain: the unloading appdomain
527 * @out_array: output array
528 * @out_size: size of output array
529 *
530 * Store inside @out_array up to @out_size objects that belong to the unloading
531 * appdomain @domain. Returns the number of stored items. Can be called repeteadly
532 * until it returns 0.
533 * The items are removed from the finalizer data structure, so the caller is supposed
534 * to finalize them.
535 * @out_array should be on the stack to allow the GC to know the objects are still alive.
536 */
537 int
538 mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size)
539 {
540 return sgen_gather_finalizers_if (object_in_domain_predicate, domain, out_array, out_size);
541 }
542
543 /*
544 * Ephemerons
545 */
546
547 typedef struct _EphemeronLinkNode EphemeronLinkNode;
548
549 struct _EphemeronLinkNode {
550 EphemeronLinkNode *next;
551 MonoArray *array;
552 };
553
554 typedef struct {
555 GCObject *key;
556 GCObject *value;
557 } Ephemeron;
558
559 static EphemeronLinkNode *ephemeron_list;
560
561 /* LOCKING: requires that the GC lock is held */
562 static void
563 null_ephemerons_for_domain (MonoDomain *domain)
564 {
565 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
566
567 while (current) {
568 MonoObject *object = (MonoObject*)current->array;
569
570 if (object)
571 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
572
573 if (object && object->vtable->domain == domain) {
574 EphemeronLinkNode *tmp = current;
575
576 if (prev)
577 prev->next = current->next;
578 else
579 ephemeron_list = current->next;
580
581 current = current->next;
582 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
583 } else {
584 prev = current;
585 current = current->next;
586 }
587 }
588 }
589
590 /* LOCKING: requires that the GC lock is held */
591 void
592 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
593 {
594 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
595 SgenGrayQueue *queue = ctx.queue;
596 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
597 Ephemeron *cur, *array_end;
598 GCObject *tombstone;
599
600 while (current) {
601 MonoArray *array = current->array;
602
603 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
604 EphemeronLinkNode *tmp = current;
605
606 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
607
608 if (prev)
609 prev->next = current->next;
610 else
611 ephemeron_list = current->next;
612
613 current = current->next;
614 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
615
616 continue;
617 }
618
619 copy_func ((GCObject**)&array, queue);
620 current->array = array;
621
622 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
623
624 cur = mono_array_addr (array, Ephemeron, 0);
625 array_end = cur + mono_array_length_fast (array);
626 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
627
628 for (; cur < array_end; ++cur) {
629 GCObject *key = cur->key;
630
631 if (!key || key == tombstone)
632 continue;
633
634 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
635 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
636 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
637
638 if (!sgen_is_object_alive_for_current_gen (key)) {
639 cur->key = tombstone;
640 cur->value = NULL;
641 continue;
642 }
643 }
644 prev = current;
645 current = current->next;
646 }
647 }
648
649 /*
650 LOCKING: requires that the GC lock is held
651
652 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
653 */
654 gboolean
655 sgen_client_mark_ephemerons (ScanCopyContext ctx)
656 {
657 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
658 SgenGrayQueue *queue = ctx.queue;
659 gboolean nothing_marked = TRUE;
660 EphemeronLinkNode *current = ephemeron_list;
661 Ephemeron *cur, *array_end;
662 GCObject *tombstone;
663
664 for (current = ephemeron_list; current; current = current->next) {
665 MonoArray *array = current->array;
666 SGEN_LOG (5, "Ephemeron array at %p", array);
667
668 /*It has to be alive*/
669 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
670 SGEN_LOG (5, "\tnot reachable");
671 continue;
672 }
673
674 copy_func ((GCObject**)&array, queue);
675
676 cur = mono_array_addr (array, Ephemeron, 0);
677 array_end = cur + mono_array_length_fast (array);
678 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
679
680 for (; cur < array_end; ++cur) {
681 GCObject *key = cur->key;
682
683 if (!key || key == tombstone)
684 continue;
685
686 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
687 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
688 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
689
690 if (sgen_is_object_alive_for_current_gen (key)) {
691 GCObject *value = cur->value;
692
693 copy_func (&cur->key, queue);
694 if (value) {
695 if (!sgen_is_object_alive_for_current_gen (value))
696 nothing_marked = FALSE;
697 copy_func (&cur->value, queue);
698 }
699 }
700 }
701 }
702
703 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
704 return nothing_marked;
705 }
706
707 gboolean
708 mono_gc_ephemeron_array_add (MonoObject *obj)
709 {
710 EphemeronLinkNode *node;
711
712 LOCK_GC;
713
714 node = sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
715 if (!node) {
716 UNLOCK_GC;
717 return FALSE;
718 }
719 node->array = (MonoArray*)obj;
720 node->next = ephemeron_list;
721 ephemeron_list = node;
722
723 SGEN_LOG (5, "Registered ephemeron array %p", obj);
724
725 UNLOCK_GC;
726 return TRUE;
727 }
728
729 /*
730 * Appdomain handling
731 */
732
733 void
734 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
735 {
736 SgenThreadInfo *info = mono_thread_info_current ();
737
738 /* Could be called from sgen_thread_unregister () with a NULL info */
739 if (domain) {
740 g_assert (info);
741 info->client_info.stopped_domain = domain;
742 }
743 }
744
745 static gboolean
746 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
747 {
748 if (mono_object_domain (start) == domain) {
749 SGEN_LOG (4, "Need to cleanup object %p", start);
750 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
751 return TRUE;
752 }
753 return FALSE;
754 }
755
756 static void
757 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
758 {
759 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
760 if (vt->klass == mono_defaults.internal_thread_class)
761 g_assert (mono_object_domain (start) == mono_get_root_domain ());
762 /* The object could be a proxy for an object in the domain
763 we're deleting. */
764 #ifndef DISABLE_REMOTING
765 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
766 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
767
768 /* The server could already have been zeroed out, so
769 we need to check for that, too. */
770 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
771 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
772 ((MonoRealProxy*)start)->unwrapped_server = NULL;
773 }
774 }
775 #endif
776 }
777
778 static gboolean
779 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
780 {
781 gboolean remove;
782
783 process_object_for_domain_clearing (obj, domain);
784 remove = need_remove_object_for_domain (obj, domain);
785
786 if (remove && obj->synchronisation) {
787 void **dislink = mono_monitor_get_object_monitor_weak_link (obj);
788 if (dislink)
789 sgen_register_disappearing_link (NULL, dislink, FALSE, TRUE);
790 }
791
792 return remove;
793 }
794
795 static void
796 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
797 {
798 if (clear_domain_process_object (obj, domain)) {
799 CANARIFY_SIZE (size);
800 memset (obj, 0, size);
801 }
802 }
803
804 static void
805 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
806 {
807 clear_domain_process_object (obj, domain);
808 }
809
810 static void
811 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
812 {
813 if (need_remove_object_for_domain (obj, domain))
814 major_collector.free_non_pinned_object (obj, size);
815 }
816
817 static void
818 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
819 {
820 if (need_remove_object_for_domain (obj, domain))
821 major_collector.free_pinned_object (obj, size);
822 }
823
824 /*
825 * When appdomains are unloaded we can easily remove objects that have finalizers,
826 * but all the others could still be present in random places on the heap.
827 * We need a sweep to get rid of them even though it's going to be costly
828 * with big heaps.
829 * The reason we need to remove them is because we access the vtable and class
830 * structures to know the object size and the reference bitmap: once the domain is
831 * unloaded the point to random memory.
832 */
833 void
834 mono_gc_clear_domain (MonoDomain * domain)
835 {
836 LOSObject *bigobj, *prev;
837 int i;
838
839 LOCK_GC;
840
841 binary_protocol_domain_unload_begin (domain);
842
843 sgen_stop_world (0);
844
845 if (sgen_concurrent_collection_in_progress ())
846 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE);
847 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
848
849 major_collector.finish_sweeping ();
850
851 sgen_process_fin_stage_entries ();
852 sgen_process_dislink_stage_entries ();
853
854 sgen_clear_nursery_fragments ();
855
856 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
857 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
858 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
859 sgen_check_for_xdomain_refs ();
860 }
861
862 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
863 to memory returned to the OS.*/
864 null_ephemerons_for_domain (domain);
865
866 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
867 sgen_null_links_if (object_in_domain_predicate, domain, i);
868
869 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
870 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
871
872 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
873 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE);
874
875 /* We need two passes over major and large objects because
876 freeing such objects might give their memory back to the OS
877 (in the case of large objects) or obliterate its vtable
878 (pinned objects with major-copying or pinned and non-pinned
879 objects with major-mark&sweep), but we might need to
880 dereference a pointer from an object to another object if
881 the first object is a proxy. */
882 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
883 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
884 clear_domain_process_object ((GCObject*)bigobj->data, domain);
885
886 prev = NULL;
887 for (bigobj = los_object_list; bigobj;) {
888 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
889 LOSObject *to_free = bigobj;
890 if (prev)
891 prev->next = bigobj->next;
892 else
893 los_object_list = bigobj->next;
894 bigobj = bigobj->next;
895 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
896 sgen_los_free_object (to_free);
897 continue;
898 }
899 prev = bigobj;
900 bigobj = bigobj->next;
901 }
902 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
903 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
904
905 if (domain == mono_get_root_domain ()) {
906 sgen_pin_stats_print_class_stats ();
907 sgen_object_layout_dump (stdout);
908 }
909
910 sgen_restart_world (0, NULL);
911
912 binary_protocol_domain_unload_end (domain);
913 binary_protocol_flush_buffers (FALSE);
914
915 UNLOCK_GC;
916 }
917
918 /*
919 * Allocation
920 */
921
922 static gboolean alloc_events = FALSE;
923
924 void
925 mono_gc_enable_alloc_events (void)
926 {
927 alloc_events = TRUE;
928 }
929
930 void*
931 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
932 {
933 MonoObject *obj = sgen_alloc_obj (vtable, size);
934
935 if (G_UNLIKELY (alloc_events))
936 mono_profiler_allocation (obj);
937
938 return obj;
939 }
940
941 void*
942 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
943 {
944 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
945
946 if (G_UNLIKELY (alloc_events))
947 mono_profiler_allocation (obj);
948
949 return obj;
950 }
951
952 void*
953 mono_gc_alloc_mature (MonoVTable *vtable)
954 {
955 MonoObject *obj = sgen_alloc_obj_mature (vtable, vtable->klass->instance_size);
956
957 if (obj && G_UNLIKELY (obj->vtable->klass->has_finalize))
958 mono_object_register_finalizer (obj);
959
960 if (G_UNLIKELY (alloc_events))
961 mono_profiler_allocation (obj);
962
963 return obj;
964 }
965
966 void*
967 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr)
968 {
969 /* FIXME: do a single allocation */
970 void *res = calloc (1, size);
971 if (!res)
972 return NULL;
973 if (!mono_gc_register_root (res, size, descr)) {
974 free (res);
975 res = NULL;
976 }
977 return res;
978 }
979
980 void
981 mono_gc_free_fixed (void* addr)
982 {
983 mono_gc_deregister_root (addr);
984 free (addr);
985 }
986
987 /*
988 * Managed allocator
989 */
990
991 static MonoMethod* alloc_method_cache [ATYPE_NUM];
992 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
993 static gboolean use_managed_allocator = TRUE;
994
995 #ifdef MANAGED_ALLOCATION
996
997 #ifdef HAVE_KW_THREAD
998
999 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1000 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1001 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1002 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1003 } while (0)
1004
1005 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1006 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1007 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1008 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1009 } while (0)
1010
1011 #else
1012
1013 #if defined(__APPLE__) || defined (HOST_WIN32)
1014 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1015 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1016 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1017 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1018 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1019 mono_mb_emit_byte ((mb), CEE_ADD); \
1020 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1021 } while (0)
1022
1023 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1024 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1025 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1026 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1027 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1028 mono_mb_emit_byte ((mb), CEE_ADD); \
1029 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1030 } while (0)
1031
1032 #else
1033 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1034 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1035 #endif
1036
1037 #endif
1038
1039 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1040 * for each class. This is currently not easy to do, as it is hard to generate basic
1041 * blocks + branches, but it is easy with the linear IL codebase.
1042 *
1043 * For this to work we'd need to solve the TLAB race, first. Now we
1044 * require the allocator to be in a few known methods to make sure
1045 * that they are executed atomically via the restart mechanism.
1046 */
1047 static MonoMethod*
1048 create_allocator (int atype, gboolean slowpath)
1049 {
1050 int p_var, size_var;
1051 guint32 slowpath_branch, max_size_branch;
1052 MonoMethodBuilder *mb;
1053 MonoMethod *res;
1054 MonoMethodSignature *csig;
1055 static gboolean registered = FALSE;
1056 int tlab_next_addr_var, new_next_var;
1057 const char *name = NULL;
1058 AllocatorWrapperInfo *info;
1059 int num_params, i;
1060
1061 if (!registered) {
1062 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1063 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1064 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1065 registered = TRUE;
1066 }
1067
1068 if (atype == ATYPE_SMALL) {
1069 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1070 } else if (atype == ATYPE_NORMAL) {
1071 name = slowpath ? "SlowAlloc" : "Alloc";
1072 } else if (atype == ATYPE_VECTOR) {
1073 name = slowpath ? "SlowAllocVector" : "AllocVector";
1074 } else if (atype == ATYPE_STRING) {
1075 name = slowpath ? "SlowAllocString" : "AllocString";
1076 } else {
1077 g_assert_not_reached ();
1078 }
1079
1080 if (atype == ATYPE_NORMAL)
1081 num_params = 1;
1082 else
1083 num_params = 2;
1084
1085 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1086 if (atype == ATYPE_STRING) {
1087 csig->ret = &mono_defaults.string_class->byval_arg;
1088 csig->params [0] = &mono_defaults.int_class->byval_arg;
1089 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1090 } else {
1091 csig->ret = &mono_defaults.object_class->byval_arg;
1092 for (i = 0; i < num_params; i++)
1093 csig->params [i] = &mono_defaults.int_class->byval_arg;
1094 }
1095
1096 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1097
1098 #ifndef DISABLE_JIT
1099 if (slowpath) {
1100 switch (atype) {
1101 case ATYPE_NORMAL:
1102 case ATYPE_SMALL:
1103 mono_mb_emit_ldarg (mb, 0);
1104 mono_mb_emit_icall (mb, mono_object_new_specific);
1105 break;
1106 case ATYPE_VECTOR:
1107 mono_mb_emit_ldarg (mb, 0);
1108 mono_mb_emit_ldarg (mb, 1);
1109 mono_mb_emit_icall (mb, mono_array_new_specific);
1110 break;
1111 case ATYPE_STRING:
1112 mono_mb_emit_ldarg (mb, 1);
1113 mono_mb_emit_icall (mb, mono_string_alloc);
1114 break;
1115 default:
1116 g_assert_not_reached ();
1117 }
1118
1119 goto done;
1120 }
1121
1122 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1123 if (atype == ATYPE_SMALL) {
1124 /* size_var = size_arg */
1125 mono_mb_emit_ldarg (mb, 1);
1126 mono_mb_emit_stloc (mb, size_var);
1127 } else if (atype == ATYPE_NORMAL) {
1128 /* size = vtable->klass->instance_size; */
1129 mono_mb_emit_ldarg (mb, 0);
1130 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1131 mono_mb_emit_byte (mb, CEE_ADD);
1132 mono_mb_emit_byte (mb, CEE_LDIND_I);
1133 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1134 mono_mb_emit_byte (mb, CEE_ADD);
1135 /* FIXME: assert instance_size stays a 4 byte integer */
1136 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1137 mono_mb_emit_byte (mb, CEE_CONV_I);
1138 mono_mb_emit_stloc (mb, size_var);
1139 } else if (atype == ATYPE_VECTOR) {
1140 MonoExceptionClause *clause;
1141 int pos, pos_leave, pos_error;
1142 MonoClass *oom_exc_class;
1143 MonoMethod *ctor;
1144
1145 /*
1146 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1147 * n < 0 => OverflowException
1148 *
1149 * We can do an unsigned comparison to catch both cases, then in the error
1150 * case compare signed to distinguish between them.
1151 */
1152 mono_mb_emit_ldarg (mb, 1);
1153 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1154 mono_mb_emit_byte (mb, CEE_CONV_U);
1155 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1156
1157 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1158 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1159 mono_mb_emit_ldarg (mb, 1);
1160 mono_mb_emit_icon (mb, 0);
1161 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1162 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1163 mono_mb_patch_short_branch (mb, pos_error);
1164 mono_mb_emit_exception (mb, "OverflowException", NULL);
1165
1166 mono_mb_patch_short_branch (mb, pos);
1167
1168 clause = mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1169 clause->try_offset = mono_mb_get_label (mb);
1170
1171 /* vtable->klass->sizes.element_size */
1172 mono_mb_emit_ldarg (mb, 0);
1173 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1174 mono_mb_emit_byte (mb, CEE_ADD);
1175 mono_mb_emit_byte (mb, CEE_LDIND_I);
1176 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1177 mono_mb_emit_byte (mb, CEE_ADD);
1178 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1179 mono_mb_emit_byte (mb, CEE_CONV_I);
1180
1181 /* * n */
1182 mono_mb_emit_ldarg (mb, 1);
1183 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1184 /* + sizeof (MonoArray) */
1185 mono_mb_emit_icon (mb, sizeof (MonoArray));
1186 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1187 mono_mb_emit_stloc (mb, size_var);
1188
1189 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1190
1191 /* catch */
1192 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1193 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1194 clause->data.catch_class = mono_class_from_name (mono_defaults.corlib,
1195 "System", "OverflowException");
1196 g_assert (clause->data.catch_class);
1197 clause->handler_offset = mono_mb_get_label (mb);
1198
1199 oom_exc_class = mono_class_from_name (mono_defaults.corlib,
1200 "System", "OutOfMemoryException");
1201 g_assert (oom_exc_class);
1202 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1203 g_assert (ctor);
1204
1205 mono_mb_emit_byte (mb, CEE_POP);
1206 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1207 mono_mb_emit_byte (mb, CEE_THROW);
1208
1209 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1210 mono_mb_set_clauses (mb, 1, clause);
1211 mono_mb_patch_branch (mb, pos_leave);
1212 /* end catch */
1213 } else if (atype == ATYPE_STRING) {
1214 int pos;
1215
1216 /*
1217 * a string allocator method takes the args: (vtable, len)
1218 *
1219 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1220 *
1221 * condition:
1222 *
1223 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1224 *
1225 * therefore:
1226 *
1227 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1228 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1229 */
1230 mono_mb_emit_ldarg (mb, 1);
1231 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1232 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1233
1234 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1235 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1236 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1237 mono_mb_patch_short_branch (mb, pos);
1238
1239 mono_mb_emit_ldarg (mb, 1);
1240 mono_mb_emit_icon (mb, 1);
1241 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1242 //WE manually fold the above + 2 here
1243 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1244 mono_mb_emit_byte (mb, CEE_ADD);
1245 mono_mb_emit_stloc (mb, size_var);
1246 } else {
1247 g_assert_not_reached ();
1248 }
1249
1250 if (atype != ATYPE_SMALL) {
1251 /* size += ALLOC_ALIGN - 1; */
1252 mono_mb_emit_ldloc (mb, size_var);
1253 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1254 mono_mb_emit_byte (mb, CEE_ADD);
1255 /* size &= ~(ALLOC_ALIGN - 1); */
1256 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1257 mono_mb_emit_byte (mb, CEE_AND);
1258 mono_mb_emit_stloc (mb, size_var);
1259 }
1260
1261 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1262 if (atype != ATYPE_SMALL) {
1263 mono_mb_emit_ldloc (mb, size_var);
1264 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1265 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1266 }
1267
1268 /*
1269 * We need to modify tlab_next, but the JIT only supports reading, so we read
1270 * another tls var holding its address instead.
1271 */
1272
1273 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1274 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1275 EMIT_TLS_ACCESS_NEXT_ADDR (mb);
1276 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1277
1278 /* p = (void**)tlab_next; */
1279 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1280 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1281 mono_mb_emit_byte (mb, CEE_LDIND_I);
1282 mono_mb_emit_stloc (mb, p_var);
1283
1284 /* new_next = (char*)p + size; */
1285 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1286 mono_mb_emit_ldloc (mb, p_var);
1287 mono_mb_emit_ldloc (mb, size_var);
1288 mono_mb_emit_byte (mb, CEE_CONV_I);
1289 mono_mb_emit_byte (mb, CEE_ADD);
1290 mono_mb_emit_stloc (mb, new_next_var);
1291
1292 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1293 mono_mb_emit_ldloc (mb, new_next_var);
1294 EMIT_TLS_ACCESS_TEMP_END (mb);
1295 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1296
1297 /* Slowpath */
1298 if (atype != ATYPE_SMALL)
1299 mono_mb_patch_short_branch (mb, max_size_branch);
1300
1301 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1302 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1303
1304 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1305 mono_mb_emit_ldarg (mb, 0);
1306 mono_mb_emit_ldloc (mb, size_var);
1307 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1308 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1309 } else if (atype == ATYPE_VECTOR) {
1310 mono_mb_emit_ldarg (mb, 1);
1311 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1312 } else if (atype == ATYPE_STRING) {
1313 mono_mb_emit_ldarg (mb, 1);
1314 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1315 } else {
1316 g_assert_not_reached ();
1317 }
1318 mono_mb_emit_byte (mb, CEE_RET);
1319
1320 /* Fastpath */
1321 mono_mb_patch_short_branch (mb, slowpath_branch);
1322
1323 /* FIXME: Memory barrier */
1324
1325 /* tlab_next = new_next */
1326 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1327 mono_mb_emit_ldloc (mb, new_next_var);
1328 mono_mb_emit_byte (mb, CEE_STIND_I);
1329
1330 /*The tlab store must be visible before the the vtable store. This could be replaced with a DDS but doing it with IL would be tricky. */
1331 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1332 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1333 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1334
1335 /* *p = vtable; */
1336 mono_mb_emit_ldloc (mb, p_var);
1337 mono_mb_emit_ldarg (mb, 0);
1338 mono_mb_emit_byte (mb, CEE_STIND_I);
1339
1340 if (atype == ATYPE_VECTOR) {
1341 /* arr->max_length = max_length; */
1342 mono_mb_emit_ldloc (mb, p_var);
1343 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1344 mono_mb_emit_ldarg (mb, 1);
1345 #ifdef MONO_BIG_ARRAYS
1346 mono_mb_emit_byte (mb, CEE_STIND_I);
1347 #else
1348 mono_mb_emit_byte (mb, CEE_STIND_I4);
1349 #endif
1350 } else if (atype == ATYPE_STRING) {
1351 /* need to set length and clear the last char */
1352 /* s->length = len; */
1353 mono_mb_emit_ldloc (mb, p_var);
1354 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1355 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1356 mono_mb_emit_ldarg (mb, 1);
1357 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1358 /* s->chars [len] = 0; */
1359 mono_mb_emit_ldloc (mb, p_var);
1360 mono_mb_emit_ldloc (mb, size_var);
1361 mono_mb_emit_icon (mb, 2);
1362 mono_mb_emit_byte (mb, MONO_CEE_SUB);
1363 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1364 mono_mb_emit_icon (mb, 0);
1365 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
1366 }
1367
1368 /*
1369 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1370 */
1371 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1372 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1373 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1374
1375 /* return p */
1376 mono_mb_emit_ldloc (mb, p_var);
1377
1378 done:
1379 mono_mb_emit_byte (mb, CEE_RET);
1380 #endif
1381
1382 res = mono_mb_create_method (mb, csig, 8);
1383 mono_mb_free (mb);
1384 mono_method_get_header (res)->init_locals = FALSE;
1385
1386 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
1387 info->gc_name = "sgen";
1388 info->alloc_type = atype;
1389 mono_marshal_set_wrapper_info (res, info);
1390
1391 return res;
1392 }
1393 #endif
1394
1395 int
1396 mono_gc_get_aligned_size_for_allocator (int size)
1397 {
1398 int aligned_size = size;
1399 aligned_size += SGEN_ALLOC_ALIGN - 1;
1400 aligned_size &= ~(SGEN_ALLOC_ALIGN - 1);
1401 return aligned_size;
1402 }
1403
1404 /*
1405 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1406 * The signature of the called method is:
1407 * object allocate (MonoVTable *vtable)
1408 */
1409 MonoMethod*
1410 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1411 {
1412 #ifdef MANAGED_ALLOCATION
1413 if (collect_before_allocs)
1414 return NULL;
1415 if (!mono_runtime_has_tls_get ())
1416 return NULL;
1417 if (klass->instance_size > tlab_size)
1418 return NULL;
1419 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1420 return NULL;
1421 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1422 return NULL;
1423 if (klass->rank)
1424 return NULL;
1425 if (klass->byval_arg.type == MONO_TYPE_STRING)
1426 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, FALSE);
1427 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1428 if (known_instance_size)
1429 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, FALSE);
1430 else
1431 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, FALSE);
1432 #else
1433 return NULL;
1434 #endif
1435 }
1436
1437 MonoMethod*
1438 mono_gc_get_managed_array_allocator (MonoClass *klass)
1439 {
1440 #ifdef MANAGED_ALLOCATION
1441 if (klass->rank != 1)
1442 return NULL;
1443 if (!mono_runtime_has_tls_get ())
1444 return NULL;
1445 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1446 return NULL;
1447 if (has_per_allocation_action)
1448 return NULL;
1449 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1450
1451 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, FALSE);
1452 #else
1453 return NULL;
1454 #endif
1455 }
1456
1457 void
1458 sgen_set_use_managed_allocator (gboolean flag)
1459 {
1460 use_managed_allocator = flag;
1461 }
1462
1463 MonoMethod*
1464 mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath)
1465 {
1466 #ifdef MANAGED_ALLOCATION
1467 MonoMethod *res;
1468 MonoMethod **cache = slowpath ? slowpath_alloc_method_cache : alloc_method_cache;
1469
1470 if (!use_managed_allocator)
1471 return NULL;
1472
1473 if (!mono_runtime_has_tls_get ())
1474 return NULL;
1475
1476 res = cache [atype];
1477 if (res)
1478 return res;
1479
1480 res = create_allocator (atype, slowpath);
1481 LOCK_GC;
1482 if (cache [atype]) {
1483 mono_free_method (res);
1484 res = cache [atype];
1485 } else {
1486 mono_memory_barrier ();
1487 cache [atype] = res;
1488 }
1489 UNLOCK_GC;
1490
1491 return res;
1492 #else
1493 return NULL;
1494 #endif
1495 }
1496
1497 guint32
1498 mono_gc_get_managed_allocator_types (void)
1499 {
1500 return ATYPE_NUM;
1501 }
1502
1503 gboolean
1504 sgen_is_managed_allocator (MonoMethod *method)
1505 {
1506 int i;
1507
1508 for (i = 0; i < ATYPE_NUM; ++i)
1509 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1510 return TRUE;
1511 return FALSE;
1512 }
1513
1514 gboolean
1515 sgen_has_managed_allocator (void)
1516 {
1517 int i;
1518
1519 for (i = 0; i < ATYPE_NUM; ++i)
1520 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1521 return TRUE;
1522 return FALSE;
1523 }
1524
1525 /*
1526 * Cardtable scanning
1527 */
1528
1529 #define MWORD_MASK (sizeof (mword) - 1)
1530
1531 static inline int
1532 find_card_offset (mword card)
1533 {
1534 /*XXX Use assembly as this generates some pretty bad code */
1535 #if defined(__i386__) && defined(__GNUC__)
1536 return (__builtin_ffs (card) - 1) / 8;
1537 #elif defined(__x86_64__) && defined(__GNUC__)
1538 return (__builtin_ffsll (card) - 1) / 8;
1539 #elif defined(__s390x__)
1540 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1541 #else
1542 int i;
1543 guint8 *ptr = (guint8 *) &card;
1544 for (i = 0; i < sizeof (mword); ++i) {
1545 if (ptr[i])
1546 return i;
1547 }
1548 return 0;
1549 #endif
1550 }
1551
1552 static guint8*
1553 find_next_card (guint8 *card_data, guint8 *end)
1554 {
1555 mword *cards, *cards_end;
1556 mword card;
1557
1558 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1559 if (*card_data)
1560 return card_data;
1561 ++card_data;
1562 }
1563
1564 if (card_data == end)
1565 return end;
1566
1567 cards = (mword*)card_data;
1568 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1569 while (cards < cards_end) {
1570 card = *cards;
1571 if (card)
1572 return (guint8*)cards + find_card_offset (card);
1573 ++cards;
1574 }
1575
1576 card_data = (guint8*)cards_end;
1577 while (card_data < end) {
1578 if (*card_data)
1579 return card_data;
1580 ++card_data;
1581 }
1582
1583 return end;
1584 }
1585
1586 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1587
1588 gboolean
1589 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, gboolean mod_union, ScanCopyContext ctx)
1590 {
1591 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1592 MonoClass *klass = vt->klass;
1593
1594 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1595
1596 if (vt->rank) {
1597 MonoArray *arr = (MonoArray*)obj;
1598 guint8 *card_data, *card_base;
1599 guint8 *card_data_end;
1600 char *obj_start = sgen_card_table_align_pointer (obj);
1601 mword bounds_size;
1602 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1603 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1604 char *obj_end = (char*)obj + obj_size - bounds_size;
1605 size_t card_count;
1606 size_t extra_idx = 0;
1607
1608 mword desc = (mword)klass->element_class->gc_descr;
1609 int elem_size = mono_array_element_size (klass);
1610
1611 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1612 guint8 *overflow_scan_end = NULL;
1613 #endif
1614
1615 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1616 if (klass->element_class->valuetype)
1617 sgen_object_layout_scanned_vtype_array ();
1618 else
1619 sgen_object_layout_scanned_ref_array ();
1620 #endif
1621
1622 if (cards)
1623 card_data = cards;
1624 else
1625 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1626
1627 card_base = card_data;
1628 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1629 card_data_end = card_data + card_count;
1630
1631
1632 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1633 /*Check for overflow and if so, setup to scan in two steps*/
1634 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1635 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1636 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1637 }
1638
1639 LOOP_HEAD:
1640 #endif
1641
1642 card_data = find_next_card (card_data, card_data_end);
1643 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1644 size_t index;
1645 size_t idx = (card_data - card_base) + extra_idx;
1646 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1647 char *card_end = start + CARD_SIZE_IN_BYTES;
1648 char *first_elem, *elem;
1649
1650 HEAVY_STAT (++los_marked_cards);
1651
1652 if (!cards)
1653 sgen_card_table_prepare_card_for_scanning (card_data);
1654
1655 card_end = MIN (card_end, obj_end);
1656
1657 if (start <= (char*)arr->vector)
1658 index = 0;
1659 else
1660 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1661
1662 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1663 if (klass->element_class->valuetype) {
1664 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1665
1666 for (; elem < card_end; elem += elem_size)
1667 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1668 } else {
1669 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
1670
1671 HEAVY_STAT (++los_array_cards);
1672 for (; elem < card_end; elem += SIZEOF_VOID_P) {
1673 gpointer new, old = *(gpointer*)elem;
1674 if ((mod_union && old) || G_UNLIKELY (sgen_ptr_in_nursery (old))) {
1675 HEAVY_STAT (++los_array_remsets);
1676 copy_func ((GCObject**)elem, ctx.queue);
1677 new = *(gpointer*)elem;
1678 if (G_UNLIKELY (sgen_ptr_in_nursery (new)))
1679 sgen_add_to_global_remset (elem, new);
1680 }
1681 }
1682 }
1683
1684 binary_protocol_card_scan (first_elem, elem - first_elem);
1685 }
1686
1687 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1688 if (overflow_scan_end) {
1689 extra_idx = card_data - card_base;
1690 card_base = card_data = sgen_shadow_cardtable;
1691 card_data_end = overflow_scan_end;
1692 overflow_scan_end = NULL;
1693 goto LOOP_HEAD;
1694 }
1695 #endif
1696 return TRUE;
1697 }
1698
1699 return FALSE;
1700 }
1701
1702 /*
1703 * Array and string allocation
1704 */
1705
1706 void*
1707 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1708 {
1709 MonoArray *arr;
1710 TLAB_ACCESS_INIT;
1711
1712 if (!SGEN_CAN_ALIGN_UP (size))
1713 return NULL;
1714
1715 #ifndef DISABLE_CRITICAL_REGION
1716 ENTER_CRITICAL_REGION;
1717 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1718 if (arr) {
1719 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1720 arr->max_length = (mono_array_size_t)max_length;
1721 EXIT_CRITICAL_REGION;
1722 goto done;
1723 }
1724 EXIT_CRITICAL_REGION;
1725 #endif
1726
1727 LOCK_GC;
1728
1729 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1730 if (G_UNLIKELY (!arr)) {
1731 UNLOCK_GC;
1732 return mono_gc_out_of_memory (size);
1733 }
1734
1735 arr->max_length = (mono_array_size_t)max_length;
1736
1737 UNLOCK_GC;
1738
1739 done:
1740 if (G_UNLIKELY (alloc_events))
1741 mono_profiler_allocation (&arr->obj);
1742
1743 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1744 return arr;
1745 }
1746
1747 void*
1748 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1749 {
1750 MonoArray *arr;
1751 MonoArrayBounds *bounds;
1752 TLAB_ACCESS_INIT;
1753
1754 if (!SGEN_CAN_ALIGN_UP (size))
1755 return NULL;
1756
1757 #ifndef DISABLE_CRITICAL_REGION
1758 ENTER_CRITICAL_REGION;
1759 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1760 if (arr) {
1761 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1762 arr->max_length = (mono_array_size_t)max_length;
1763
1764 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1765 arr->bounds = bounds;
1766 EXIT_CRITICAL_REGION;
1767 goto done;
1768 }
1769 EXIT_CRITICAL_REGION;
1770 #endif
1771
1772 LOCK_GC;
1773
1774 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1775 if (G_UNLIKELY (!arr)) {
1776 UNLOCK_GC;
1777 return mono_gc_out_of_memory (size);
1778 }
1779
1780 arr->max_length = (mono_array_size_t)max_length;
1781
1782 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1783 arr->bounds = bounds;
1784
1785 UNLOCK_GC;
1786
1787 done:
1788 if (G_UNLIKELY (alloc_events))
1789 mono_profiler_allocation (&arr->obj);
1790
1791 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1792 return arr;
1793 }
1794
1795 void*
1796 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1797 {
1798 MonoString *str;
1799 TLAB_ACCESS_INIT;
1800
1801 if (!SGEN_CAN_ALIGN_UP (size))
1802 return NULL;
1803
1804 #ifndef DISABLE_CRITICAL_REGION
1805 ENTER_CRITICAL_REGION;
1806 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1807 if (str) {
1808 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1809 str->length = len;
1810 EXIT_CRITICAL_REGION;
1811 goto done;
1812 }
1813 EXIT_CRITICAL_REGION;
1814 #endif
1815
1816 LOCK_GC;
1817
1818 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1819 if (G_UNLIKELY (!str)) {
1820 UNLOCK_GC;
1821 return mono_gc_out_of_memory (size);
1822 }
1823
1824 str->length = len;
1825
1826 UNLOCK_GC;
1827
1828 done:
1829 if (G_UNLIKELY (alloc_events))
1830 mono_profiler_allocation (&str->object);
1831
1832 return str;
1833 }
1834
1835 /*
1836 * Strings
1837 */
1838
1839 void
1840 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1841 {
1842 mono_unichar2 *new_end = str->chars + new_length;
1843
1844 /* zero the discarded string. This null-delimits the string and allows
1845 * the space to be reclaimed by SGen. */
1846
1847 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1848 CHECK_CANARY_FOR_OBJECT ((GCObject*)str);
1849 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1850 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1851 } else {
1852 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1853 }
1854
1855 str->length = new_length;
1856 }
1857
1858 /*
1859 * Profiling
1860 */
1861
1862 #define GC_ROOT_NUM 32
1863 typedef struct {
1864 int count; /* must be the first field */
1865 void *objects [GC_ROOT_NUM];
1866 int root_types [GC_ROOT_NUM];
1867 uintptr_t extra_info [GC_ROOT_NUM];
1868 } GCRootReport;
1869
1870 static void
1871 notify_gc_roots (GCRootReport *report)
1872 {
1873 if (!report->count)
1874 return;
1875 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1876 report->count = 0;
1877 }
1878
1879 static void
1880 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1881 {
1882 if (report->count == GC_ROOT_NUM)
1883 notify_gc_roots (report);
1884 report->objects [report->count] = object;
1885 report->root_types [report->count] = rtype;
1886 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1887 }
1888
1889 void
1890 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1891 {
1892 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1893 GCRootReport report;
1894 int idx;
1895 report.count = 0;
1896 for (idx = 0; idx < count; ++idx)
1897 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1898 notify_gc_roots (&report);
1899 }
1900 }
1901
1902 static void
1903 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1904 {
1905 GCRootReport report;
1906 size_t i;
1907
1908 report.count = 0;
1909 for (i = 0; i < queue->next_slot; ++i) {
1910 void *obj = queue->data [i];
1911 if (!obj)
1912 continue;
1913 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1914 }
1915 notify_gc_roots (&report);
1916 }
1917
1918 static void
1919 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1920 {
1921 report_finalizer_roots_from_queue (fin_ready_queue);
1922 report_finalizer_roots_from_queue (critical_fin_queue);
1923 }
1924
1925 static GCRootReport *root_report;
1926
1927 static void
1928 single_arg_report_root (MonoObject **obj, void *gc_data)
1929 {
1930 if (*obj)
1931 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1932 }
1933
1934 static void
1935 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1936 {
1937 switch (desc & ROOT_DESC_TYPE_MASK) {
1938 case ROOT_DESC_BITMAP:
1939 desc >>= ROOT_DESC_TYPE_SHIFT;
1940 while (desc) {
1941 if ((desc & 1) && *start_root) {
1942 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1943 }
1944 desc >>= 1;
1945 start_root++;
1946 }
1947 return;
1948 case ROOT_DESC_COMPLEX: {
1949 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1950 gsize bwords = (*bitmap_data) - 1;
1951 void **start_run = start_root;
1952 bitmap_data++;
1953 while (bwords-- > 0) {
1954 gsize bmap = *bitmap_data++;
1955 void **objptr = start_run;
1956 while (bmap) {
1957 if ((bmap & 1) && *objptr) {
1958 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1959 }
1960 bmap >>= 1;
1961 ++objptr;
1962 }
1963 start_run += GC_BITS_PER_WORD;
1964 }
1965 break;
1966 }
1967 case ROOT_DESC_USER: {
1968 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1969 root_report = report;
1970 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1971 break;
1972 }
1973 case ROOT_DESC_RUN_LEN:
1974 g_assert_not_reached ();
1975 default:
1976 g_assert_not_reached ();
1977 }
1978 }
1979
1980 static void
1981 report_registered_roots_by_type (int root_type)
1982 {
1983 GCRootReport report;
1984 void **start_root;
1985 RootRecord *root;
1986 report.count = 0;
1987 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
1988 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1989 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1990 } SGEN_HASH_TABLE_FOREACH_END;
1991 notify_gc_roots (&report);
1992 }
1993
1994 static void
1995 report_registered_roots (void)
1996 {
1997 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1998 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
1999 }
2000
2001 void
2002 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2003 {
2004 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2005 report_registered_roots ();
2006 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2007 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2008 }
2009
2010 static GCRootReport major_root_report;
2011 static gboolean profile_roots;
2012
2013 void
2014 sgen_client_collecting_major_1 (void)
2015 {
2016 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2017 memset (&major_root_report, 0, sizeof (GCRootReport));
2018 }
2019
2020 void
2021 sgen_client_pinned_los_object (GCObject *obj)
2022 {
2023 if (profile_roots)
2024 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2025 }
2026
2027 void
2028 sgen_client_collecting_major_2 (void)
2029 {
2030 if (profile_roots)
2031 notify_gc_roots (&major_root_report);
2032
2033 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2034 report_registered_roots ();
2035 }
2036
2037 void
2038 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2039 {
2040 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2041 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2042 }
2043
2044 #define MOVED_OBJECTS_NUM 64
2045 static void *moved_objects [MOVED_OBJECTS_NUM];
2046 static int moved_objects_idx = 0;
2047
2048 void
2049 mono_sgen_register_moved_object (void *obj, void *destination)
2050 {
2051 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2052
2053 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2054 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2055 moved_objects_idx = 0;
2056 }
2057 moved_objects [moved_objects_idx++] = obj;
2058 moved_objects [moved_objects_idx++] = destination;
2059 }
2060
2061 void
2062 mono_sgen_gc_event_moves (void)
2063 {
2064 if (moved_objects_idx) {
2065 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2066 moved_objects_idx = 0;
2067 }
2068 }
2069
2070 /*
2071 * Heap walking
2072 */
2073
2074 #define REFS_SIZE 128
2075 typedef struct {
2076 void *data;
2077 MonoGCReferences callback;
2078 int flags;
2079 int count;
2080 int called;
2081 MonoObject *refs [REFS_SIZE];
2082 uintptr_t offsets [REFS_SIZE];
2083 } HeapWalkInfo;
2084
2085 #undef HANDLE_PTR
2086 #define HANDLE_PTR(ptr,obj) do { \
2087 if (*(ptr)) { \
2088 if (hwi->count == REFS_SIZE) { \
2089 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2090 hwi->count = 0; \
2091 hwi->called = 1; \
2092 } \
2093 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2094 hwi->refs [hwi->count++] = *(ptr); \
2095 } \
2096 } while (0)
2097
2098 static void
2099 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2100 {
2101 char *start = (char*)obj;
2102 mword desc = sgen_obj_get_descriptor (obj);
2103
2104 #include "sgen/sgen-scan-object.h"
2105 }
2106
2107 static void
2108 walk_references (GCObject *start, size_t size, void *data)
2109 {
2110 HeapWalkInfo *hwi = data;
2111 hwi->called = 0;
2112 hwi->count = 0;
2113 collect_references (hwi, start, size);
2114 if (hwi->count || !hwi->called)
2115 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2116 }
2117
2118 /**
2119 * mono_gc_walk_heap:
2120 * @flags: flags for future use
2121 * @callback: a function pointer called for each object in the heap
2122 * @data: a user data pointer that is passed to callback
2123 *
2124 * This function can be used to iterate over all the live objects in the heap:
2125 * for each object, @callback is invoked, providing info about the object's
2126 * location in memory, its class, its size and the objects it references.
2127 * For each referenced object it's offset from the object address is
2128 * reported in the offsets array.
2129 * The object references may be buffered, so the callback may be invoked
2130 * multiple times for the same object: in all but the first call, the size
2131 * argument will be zero.
2132 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2133 * profiler event handler.
2134 *
2135 * Returns: a non-zero value if the GC doesn't support heap walking
2136 */
2137 int
2138 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2139 {
2140 HeapWalkInfo hwi;
2141
2142 hwi.flags = flags;
2143 hwi.callback = callback;
2144 hwi.data = data;
2145
2146 sgen_clear_nursery_fragments ();
2147 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE);
2148
2149 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2150 sgen_los_iterate_objects (walk_references, &hwi);
2151
2152 return 0;
2153 }
2154
2155 /*
2156 * Threads
2157 */
2158
2159 void
2160 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2161 {
2162 gc_callbacks = *callbacks;
2163 }
2164
2165 MonoGCCallbacks *
2166 mono_gc_get_gc_callbacks ()
2167 {
2168 return &gc_callbacks;
2169 }
2170
2171 void
2172 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2173 {
2174 size_t stsize = 0;
2175 guint8 *staddr = NULL;
2176
2177 #ifndef HAVE_KW_THREAD
2178 g_assert (!mono_native_tls_get_value (thread_info_key));
2179 mono_native_tls_set_value (thread_info_key, info);
2180 #else
2181 sgen_thread_info = info;
2182 #endif
2183
2184 info->client_info.skip = 0;
2185 info->client_info.stopped_ip = NULL;
2186 info->client_info.stopped_domain = NULL;
2187
2188 info->client_info.stack_start = NULL;
2189
2190 #ifdef SGEN_POSIX_STW
2191 info->client_info.stop_count = -1;
2192 info->client_info.signal = 0;
2193 #endif
2194
2195 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2196 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2197 if (staddr) {
2198 #ifndef HOST_WIN32
2199 info->client_info.stack_start_limit = staddr;
2200 #endif
2201 info->client_info.stack_end = staddr + stsize;
2202 } else {
2203 gsize stack_bottom = (gsize)stack_bottom_fallback;
2204 stack_bottom += 4095;
2205 stack_bottom &= ~4095;
2206 info->client_info.stack_end = (char*)stack_bottom;
2207 }
2208
2209 #ifdef USE_MONO_CTX
2210 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2211 #else
2212 memset (&info->client_info.regs, 0, sizeof (info->client_info.regs));
2213 #endif
2214
2215 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2216 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2217
2218 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2219
2220 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2221 }
2222
2223 void
2224 sgen_client_thread_unregister (SgenThreadInfo *p)
2225 {
2226 MonoNativeThreadId tid;
2227
2228 #ifndef HAVE_KW_THREAD
2229 mono_native_tls_set_value (thread_info_key, NULL);
2230 #else
2231 sgen_thread_info = NULL;
2232 #endif
2233
2234 tid = mono_thread_info_get_tid (p);
2235
2236 if (p->client_info.info.runtime_thread)
2237 mono_threads_add_joinable_thread ((gpointer)tid);
2238
2239 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2240 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2241 p->client_info.runtime_data = NULL;
2242 }
2243
2244 binary_protocol_thread_unregister ((gpointer)tid);
2245 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2246 }
2247
2248 void
2249 mono_gc_set_skip_thread (gboolean skip)
2250 {
2251 SgenThreadInfo *info = mono_thread_info_current ();
2252
2253 LOCK_GC;
2254 info->client_info.gc_disabled = skip;
2255 UNLOCK_GC;
2256 }
2257
2258 static gboolean
2259 is_critical_method (MonoMethod *method)
2260 {
2261 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2262 }
2263
2264 static gboolean
2265 thread_in_critical_region (SgenThreadInfo *info)
2266 {
2267 return info->client_info.in_critical_region;
2268 }
2269
2270 static void
2271 sgen_thread_attach (SgenThreadInfo *info)
2272 {
2273 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2274 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2275 }
2276
2277 static void
2278 sgen_thread_detach (SgenThreadInfo *p)
2279 {
2280 /* If a delegate is passed to native code and invoked on a thread we dont
2281 * know about, the jit will register it with mono_jit_thread_attach, but
2282 * we have no way of knowing when that thread goes away. SGen has a TSD
2283 * so we assume that if the domain is still registered, we can detach
2284 * the thread
2285 */
2286 if (mono_domain_get ())
2287 mono_thread_detach_internal (mono_thread_internal_current ());
2288 }
2289
2290 gboolean
2291 mono_gc_register_thread (void *baseptr)
2292 {
2293 return mono_thread_info_attach (baseptr) != NULL;
2294 }
2295
2296 gboolean
2297 mono_gc_is_gc_thread (void)
2298 {
2299 gboolean result;
2300 LOCK_GC;
2301 result = mono_thread_info_current () != NULL;
2302 UNLOCK_GC;
2303 return result;
2304 }
2305
2306 void
2307 sgen_client_thread_register_worker (void)
2308 {
2309 mono_thread_info_register_small_id ();
2310 }
2311
2312 /* Variables holding start/end nursery so it won't have to be passed at every call */
2313 static void *scan_area_arg_start, *scan_area_arg_end;
2314
2315 void
2316 mono_gc_conservatively_scan_area (void *start, void *end)
2317 {
2318 sgen_conservatively_pin_objects_from (start, end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2319 }
2320
2321 void*
2322 mono_gc_scan_object (void *obj, void *gc_data)
2323 {
2324 ScanCopyContext *ctx = gc_data;
2325 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2326 return obj;
2327 }
2328
2329 /*
2330 * Mark from thread stacks and registers.
2331 */
2332 void
2333 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2334 {
2335 SgenThreadInfo *info;
2336
2337 scan_area_arg_start = start_nursery;
2338 scan_area_arg_end = end_nursery;
2339
2340 FOREACH_THREAD (info) {
2341 int skip_reason = 0;
2342 if (info->client_info.skip) {
2343 SGEN_LOG (3, "Skipping dead thread %p, range: %p-%p, size: %zd", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start);
2344 skip_reason = 1;
2345 } else if (info->client_info.gc_disabled) {
2346 SGEN_LOG (3, "GC disabled for thread %p, range: %p-%p, size: %zd", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start);
2347 skip_reason = 2;
2348 } else if (!mono_thread_info_is_live (info)) {
2349 SGEN_LOG (3, "Skipping non-running thread %p, range: %p-%p, size: %zd (state %x)", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start, info->client_info.info.thread_state);
2350 skip_reason = 3;
2351 }
2352
2353 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2354
2355 if (skip_reason)
2356 continue;
2357
2358 g_assert (info->client_info.suspend_done);
2359 SGEN_LOG (3, "Scanning thread %p, range: %p-%p, size: %zd, pinned=%zd", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start, sgen_get_pinned_count ());
2360 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2361 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, info->client_info.stack_start, info->client_info.stack_end, precise, &ctx);
2362 } else if (!precise) {
2363 if (!conservative_stack_mark) {
2364 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2365 conservative_stack_mark = TRUE;
2366 }
2367 sgen_conservatively_pin_objects_from (info->client_info.stack_start, info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2368 }
2369
2370 if (!precise) {
2371 #ifdef USE_MONO_CTX
2372 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)&info->client_info.ctx + ARCH_NUM_REGS,
2373 start_nursery, end_nursery, PIN_TYPE_STACK);
2374 #else
2375 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2376 start_nursery, end_nursery, PIN_TYPE_STACK);
2377 #endif
2378 }
2379 } END_FOREACH_THREAD
2380 }
2381
2382 /*
2383 * mono_gc_set_stack_end:
2384 *
2385 * Set the end of the current threads stack to STACK_END. The stack space between
2386 * STACK_END and the real end of the threads stack will not be scanned during collections.
2387 */
2388 void
2389 mono_gc_set_stack_end (void *stack_end)
2390 {
2391 SgenThreadInfo *info;
2392
2393 LOCK_GC;
2394 info = mono_thread_info_current ();
2395 if (info) {
2396 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2397 info->client_info.stack_end = stack_end;
2398 }
2399 UNLOCK_GC;
2400 }
2401
2402 /*
2403 * Roots
2404 */
2405
2406 int
2407 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr)
2408 {
2409 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED);
2410 }
2411
2412 int
2413 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr)
2414 {
2415 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER);
2416 }
2417
2418 void
2419 mono_gc_deregister_root (char* addr)
2420 {
2421 sgen_deregister_root (addr);
2422 }
2423
2424 /*
2425 * PThreads
2426 */
2427
2428 #ifndef HOST_WIN32
2429 int
2430 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2431 {
2432 return pthread_create (new_thread, attr, start_routine, arg);
2433 }
2434 #endif
2435
2436 /*
2437 * Miscellaneous
2438 */
2439
2440 void
2441 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2442 {
2443 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2444 }
2445
2446 gboolean
2447 mono_gc_user_markers_supported (void)
2448 {
2449 return TRUE;
2450 }
2451
2452 gboolean
2453 mono_object_is_alive (MonoObject* o)
2454 {
2455 return TRUE;
2456 }
2457
2458 int
2459 mono_gc_get_generation (MonoObject *obj)
2460 {
2461 if (sgen_ptr_in_nursery (obj))
2462 return 0;
2463 return 1;
2464 }
2465
2466 void
2467 mono_gc_enable_events (void)
2468 {
2469 }
2470
2471 const char *
2472 mono_gc_get_gc_name (void)
2473 {
2474 return "sgen";
2475 }
2476
2477 char*
2478 mono_gc_get_description (void)
2479 {
2480 return g_strdup ("sgen");
2481 }
2482
2483 void
2484 mono_gc_set_desktop_mode (void)
2485 {
2486 }
2487
2488 gboolean
2489 mono_gc_is_moving (void)
2490 {
2491 return TRUE;
2492 }
2493
2494 gboolean
2495 mono_gc_is_disabled (void)
2496 {
2497 return FALSE;
2498 }
2499
2500 #ifdef HOST_WIN32
2501 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2502 {
2503 return TRUE;
2504 }
2505 #endif
2506
2507 int
2508 mono_gc_max_generation (void)
2509 {
2510 return 1;
2511 }
2512
2513 gboolean
2514 mono_gc_precise_stack_mark_enabled (void)
2515 {
2516 return !conservative_stack_mark;
2517 }
2518
2519 void
2520 mono_gc_collect (int generation)
2521 {
2522 sgen_gc_collect (generation);
2523 }
2524
2525 int
2526 mono_gc_collection_count (int generation)
2527 {
2528 return sgen_gc_collection_count (generation);
2529 }
2530
2531 int64_t
2532 mono_gc_get_used_size (void)
2533 {
2534 return (int64_t)sgen_gc_get_used_size ();
2535 }
2536
2537 int64_t
2538 mono_gc_get_heap_size (void)
2539 {
2540 return (int64_t)sgen_gc_get_total_heap_allocation ();
2541 }
2542
2543 MonoGCDescriptor
2544 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2545 {
2546 return sgen_make_user_root_descriptor (marker);
2547 }
2548
2549 MonoGCDescriptor
2550 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2551 {
2552 return SGEN_DESC_STRING;
2553 }
2554
2555 void*
2556 mono_gc_get_nursery (int *shift_bits, size_t *size)
2557 {
2558 *size = sgen_nursery_size;
2559 *shift_bits = DEFAULT_NURSERY_BITS;
2560 return sgen_get_nursery_start ();
2561 }
2562
2563 int
2564 mono_gc_get_los_limit (void)
2565 {
2566 return SGEN_MAX_SMALL_OBJ_SIZE;
2567 }
2568
2569 void
2570 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
2571 {
2572 sgen_register_disappearing_link (obj, link_addr, track, FALSE);
2573 }
2574
2575 void
2576 mono_gc_weak_link_remove (void **link_addr, gboolean track)
2577 {
2578 sgen_register_disappearing_link (NULL, link_addr, track, FALSE);
2579 }
2580
2581 MonoObject*
2582 mono_gc_weak_link_get (void **link_addr)
2583 {
2584 return sgen_weak_link_get (link_addr);
2585 }
2586
2587 gboolean
2588 mono_gc_set_allow_synchronous_major (gboolean flag)
2589 {
2590 return sgen_set_allow_synchronous_major (flag);
2591 }
2592
2593 void*
2594 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2595 {
2596 void *result;
2597 LOCK_INTERRUPTION;
2598 result = func (data);
2599 UNLOCK_INTERRUPTION;
2600 return result;
2601 }
2602
2603 void
2604 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2605 {
2606 // FIXME:
2607 }
2608
2609 void
2610 sgen_client_out_of_memory (size_t size)
2611 {
2612 mono_gc_out_of_memory (size);
2613 }
2614
2615 guint8*
2616 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2617 {
2618 return sgen_get_card_table_configuration (shift_bits, mask);
2619 }
2620
2621 gboolean
2622 mono_gc_card_table_nursery_check (void)
2623 {
2624 return !sgen_get_major_collector ()->is_concurrent;
2625 }
2626
2627 /* Negative value to remove */
2628 void
2629 mono_gc_add_memory_pressure (gint64 value)
2630 {
2631 /* FIXME: Implement at some point? */
2632 }
2633
2634 /*
2635 * Logging
2636 */
2637
2638 void
2639 sgen_client_degraded_allocation (size_t size)
2640 {
2641 static int last_major_gc_warned = -1;
2642 static int num_degraded = 0;
2643
2644 if (last_major_gc_warned < gc_stats.major_gc_count) {
2645 ++num_degraded;
2646 if (num_degraded == 1 || num_degraded == 3)
2647 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2648 else if (num_degraded == 10)
2649 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2650 last_major_gc_warned = gc_stats.major_gc_count;
2651 }
2652 }
2653
2654 void
2655 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2656 {
2657 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2658 mword num_major_sections = major_collector->get_num_major_sections ();
2659 char full_timing_buff [1024];
2660 full_timing_buff [0] = '\0';
2661
2662 if (!info->is_overflow)
2663 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2664 if (info->generation == GENERATION_OLD)
2665 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2666 info->is_overflow ? "_OVERFLOW" : "",
2667 info->reason ? info->reason : "",
2668 (int)info->total_time / 10000.0f,
2669 full_timing_buff,
2670 major_collector->section_size * num_major_sections / 1024,
2671 major_collector->section_size * last_major_num_sections / 1024,
2672 los_memory_usage / 1024,
2673 last_los_memory_usage / 1024);
2674 else
2675 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2676 info->is_overflow ? "_OVERFLOW" : "",
2677 info->reason ? info->reason : "",
2678 (int)info->total_time / 10000.0f,
2679 full_timing_buff,
2680 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2681 major_collector->section_size * num_major_sections / 1024,
2682 los_memory_usage / 1024);
2683 }
2684
2685 /*
2686 * Debugging
2687 */
2688
2689 const char*
2690 sgen_client_description_for_internal_mem_type (int type)
2691 {
2692 switch (type) {
2693 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2694 default:
2695 return NULL;
2696 }
2697 }
2698
2699 void
2700 sgen_client_pre_collection_checks (void)
2701 {
2702 if (sgen_mono_xdomain_checks) {
2703 sgen_clear_nursery_fragments ();
2704 sgen_check_for_xdomain_refs ();
2705 }
2706 }
2707
2708 gboolean
2709 sgen_client_vtable_is_inited (MonoVTable *vt)
2710 {
2711 return vt->klass->inited;
2712 }
2713
2714 const char*
2715 sgen_client_vtable_get_namespace (MonoVTable *vt)
2716 {
2717 return vt->klass->name_space;
2718 }
2719
2720 const char*
2721 sgen_client_vtable_get_name (MonoVTable *vt)
2722 {
2723 return vt->klass->name;
2724 }
2725
2726 /*
2727 * Initialization
2728 */
2729
2730 void
2731 sgen_client_init (void)
2732 {
2733 int dummy;
2734 MonoThreadInfoCallbacks cb;
2735
2736 cb.thread_register = sgen_thread_register;
2737 cb.thread_detach = sgen_thread_detach;
2738 cb.thread_unregister = sgen_thread_unregister;
2739 cb.thread_attach = sgen_thread_attach;
2740 cb.mono_method_is_critical = (gpointer)is_critical_method;
2741 cb.mono_thread_in_critical_region = thread_in_critical_region;
2742
2743 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2744
2745 ///* Keep this the default for now */
2746 /* Precise marking is broken on all supported targets. Disable until fixed. */
2747 conservative_stack_mark = TRUE;
2748
2749 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2750
2751 mono_sgen_init_stw ();
2752
2753 #ifndef HAVE_KW_THREAD
2754 mono_native_tls_alloc (&thread_info_key, NULL);
2755 #if defined(__APPLE__) || defined (HOST_WIN32)
2756 /*
2757 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2758 * where the two are the same.
2759 */
2760 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2761 #endif
2762 #else
2763 {
2764 int tls_offset = -1;
2765 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2766 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2767 }
2768 #endif
2769
2770 /*
2771 * This needs to happen before any internal allocations because
2772 * it inits the small id which is required for hazard pointer
2773 * operations.
2774 */
2775 sgen_os_init ();
2776
2777 mono_gc_register_thread (&dummy);
2778 }
2779
2780 gboolean
2781 sgen_client_handle_gc_param (const char *opt)
2782 {
2783 if (g_str_has_prefix (opt, "stack-mark=")) {
2784 opt = strchr (opt, '=') + 1;
2785 if (!strcmp (opt, "precise")) {
2786 conservative_stack_mark = FALSE;
2787 } else if (!strcmp (opt, "conservative")) {
2788 conservative_stack_mark = TRUE;
2789 } else {
2790 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2791 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2792 }
2793 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2794 opt = strchr (opt, '=') + 1;
2795 sgen_set_bridge_implementation (opt);
2796 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2797 /* FIXME: This should probably in MONO_GC_DEBUG */
2798 sgen_register_test_toggleref_callback ();
2799 } else {
2800 return FALSE;
2801 }
2802 return TRUE;
2803 }
2804
2805 void
2806 sgen_client_print_gc_params_usage (void)
2807 {
2808 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2809 }
2810
2811 gboolean
2812 sgen_client_handle_gc_debug (const char *opt)
2813 {
2814 if (!strcmp (opt, "xdomain-checks")) {
2815 sgen_mono_xdomain_checks = TRUE;
2816 } else if (!strcmp (opt, "do-not-finalize")) {
2817 do_not_finalize = TRUE;
2818 } else if (!strcmp (opt, "log-finalizers")) {
2819 log_finalizers = TRUE;
2820 } else if (!strcmp (opt, "no-managed-allocator")) {
2821 sgen_set_use_managed_allocator (FALSE);
2822 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2823 return FALSE;
2824 }
2825 return TRUE;
2826 }
2827
2828 void
2829 sgen_client_print_gc_debug_usage (void)
2830 {
2831 fprintf (stderr, " xdomain-checks\n");
2832 fprintf (stderr, " do-not-finalize\n");
2833 fprintf (stderr, " log-finalizers\n");
2834 fprintf (stderr, " no-managed-allocator\n");
2835 sgen_bridge_print_gc_debug_usage ();
2836 }
2837
2838
2839 gpointer
2840 sgen_client_get_provenance (void)
2841 {
2842 #ifdef SGEN_OBJECT_PROVENANCE
2843 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2844 gpointer (*get_provenance_func) (void);
2845 if (!cb)
2846 return NULL;
2847 get_provenance_func = cb->get_provenance_func;
2848 if (get_provenance_func)
2849 return get_provenance_func ();
2850 return NULL;
2851 #else
2852 return NULL;
2853 #endif
2854 }
2855
2856 void
2857 sgen_client_describe_invalid_pointer (GCObject *ptr)
2858 {
2859 sgen_bridge_describe_pointer (ptr);
2860 }
2861
2862 void
2863 mono_gc_base_init (void)
2864 {
2865 mono_counters_init ();
2866
2867 #ifdef HEAVY_STATISTICS
2868 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2869 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2870 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2871
2872 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2873 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2874 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2875 #endif
2876
2877 sgen_gc_init ();
2878
2879 if (nursery_canaries_enabled ())
2880 sgen_set_use_managed_allocator (FALSE);
2881 }
2882
2883 void
2884 mono_gc_base_cleanup (void)
2885 {
2886 }
2887
2888 gboolean
2889 mono_gc_is_null (void)
2890 {
2891 return FALSE;
2892 }
2893
2894 #endif
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