2 * sgen-protocol.c: Binary protocol of internal activity, to aid
5 * Copyright 2001-2003 Ximian, Inc
6 * Copyright 2003-2010 Novell, Inc.
7 * Copyright (C) 2012 Xamarin Inc
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License 2.0 as published by the Free Software Foundation;
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License 2.0 along with this library; if not, write to the Free
20 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include "sgen-protocol.h"
28 #include "sgen-memory-governor.h"
29 #include "utils/mono-mmap.h"
31 #ifdef SGEN_BINARY_PROTOCOL
33 /* If not null, dump binary protocol to this file */
34 static FILE *binary_protocol_file = NULL;
36 /* We set this to -1 to indicate an exclusive lock */
37 static volatile int binary_protocol_use_count = 0;
39 #define BINARY_PROTOCOL_BUFFER_SIZE (65536 - 2 * 8)
41 typedef struct _BinaryProtocolBuffer BinaryProtocolBuffer;
42 struct _BinaryProtocolBuffer {
43 BinaryProtocolBuffer * volatile next;
45 unsigned char buffer [BINARY_PROTOCOL_BUFFER_SIZE];
48 static BinaryProtocolBuffer * volatile binary_protocol_buffers = NULL;
51 binary_protocol_init (const char *filename)
53 binary_protocol_file = fopen (filename, "w");
57 binary_protocol_is_enabled (void)
59 return binary_protocol_file != NULL;
63 try_lock_exclusive (void)
66 if (binary_protocol_use_count)
68 } while (InterlockedCompareExchange (&binary_protocol_use_count, -1, 0) != 0);
69 mono_memory_barrier ();
74 unlock_exclusive (void)
76 mono_memory_barrier ();
77 SGEN_ASSERT (0, binary_protocol_use_count == -1, "Exclusively locked count must be -1");
78 if (InterlockedCompareExchange (&binary_protocol_use_count, 0, -1) != -1)
79 SGEN_ASSERT (0, FALSE, "Somebody messed with the exclusive lock");
88 old_count = binary_protocol_use_count;
90 /* Exclusively locked - retry */
91 /* FIXME: short back-off */
94 } while (InterlockedCompareExchange (&binary_protocol_use_count, old_count + 1, old_count) != old_count);
95 mono_memory_barrier ();
99 unlock_recursive (void)
102 mono_memory_barrier ();
104 old_count = binary_protocol_use_count;
105 SGEN_ASSERT (0, old_count > 0, "Locked use count must be at least 1");
106 } while (InterlockedCompareExchange (&binary_protocol_use_count, old_count - 1, old_count) != old_count);
110 binary_protocol_flush_buffers_rec (BinaryProtocolBuffer *buffer)
115 binary_protocol_flush_buffers_rec (buffer->next);
117 g_assert (buffer->index > 0);
118 fwrite (buffer->buffer, 1, buffer->index, binary_protocol_file);
120 sgen_free_os_memory (buffer, sizeof (BinaryProtocolBuffer), SGEN_ALLOC_INTERNAL);
124 binary_protocol_flush_buffers (gboolean force)
126 if (!binary_protocol_file)
129 if (!force && !try_lock_exclusive ())
132 binary_protocol_flush_buffers_rec (binary_protocol_buffers);
133 binary_protocol_buffers = NULL;
138 fflush (binary_protocol_file);
141 static BinaryProtocolBuffer*
142 binary_protocol_get_buffer (int length)
144 BinaryProtocolBuffer *buffer, *new_buffer;
147 buffer = binary_protocol_buffers;
148 if (buffer && buffer->index + length <= BINARY_PROTOCOL_BUFFER_SIZE)
151 new_buffer = sgen_alloc_os_memory (sizeof (BinaryProtocolBuffer), SGEN_ALLOC_INTERNAL | SGEN_ALLOC_ACTIVATE, "debugging memory");
152 new_buffer->next = buffer;
153 new_buffer->index = 0;
155 if (InterlockedCompareExchangePointer ((void**)&binary_protocol_buffers, new_buffer, buffer) != buffer) {
156 sgen_free_os_memory (new_buffer, sizeof (BinaryProtocolBuffer), SGEN_ALLOC_INTERNAL);
165 protocol_entry (unsigned char type, gpointer data, int size)
168 BinaryProtocolBuffer *buffer;
170 if (!binary_protocol_file)
176 buffer = binary_protocol_get_buffer (size + 1);
178 index = buffer->index;
179 if (index + 1 + size > BINARY_PROTOCOL_BUFFER_SIZE)
182 if (InterlockedCompareExchange (&buffer->index, index + 1 + size, index) != index)
183 goto retry_same_buffer;
185 /* FIXME: if we're interrupted at this point, we have a buffer
186 entry that contains random data. */
188 buffer->buffer [index++] = type;
189 memcpy (buffer->buffer + index, data, size);
192 g_assert (index <= BINARY_PROTOCOL_BUFFER_SIZE);
198 binary_protocol_collection_force (int generation)
200 SGenProtocolCollectionForce entry = { generation };
201 binary_protocol_flush_buffers (FALSE);
202 protocol_entry (SGEN_PROTOCOL_COLLECTION_FORCE, &entry, sizeof (SGenProtocolCollectionForce));
206 binary_protocol_collection_begin (int index, int generation)
208 SGenProtocolCollection entry = { index, generation };
209 binary_protocol_flush_buffers (FALSE);
210 protocol_entry (SGEN_PROTOCOL_COLLECTION_BEGIN, &entry, sizeof (SGenProtocolCollection));
214 binary_protocol_collection_end (int index, int generation)
216 SGenProtocolCollection entry = { index, generation };
217 binary_protocol_flush_buffers (FALSE);
218 protocol_entry (SGEN_PROTOCOL_COLLECTION_END, &entry, sizeof (SGenProtocolCollection));
222 binary_protocol_alloc (gpointer obj, gpointer vtable, int size)
224 SGenProtocolAlloc entry = { obj, vtable, size };
225 protocol_entry (SGEN_PROTOCOL_ALLOC, &entry, sizeof (SGenProtocolAlloc));
229 binary_protocol_alloc_pinned (gpointer obj, gpointer vtable, int size)
231 SGenProtocolAlloc entry = { obj, vtable, size };
232 protocol_entry (SGEN_PROTOCOL_ALLOC_PINNED, &entry, sizeof (SGenProtocolAlloc));
236 binary_protocol_alloc_degraded (gpointer obj, gpointer vtable, int size)
238 SGenProtocolAlloc entry = { obj, vtable, size };
239 protocol_entry (SGEN_PROTOCOL_ALLOC_DEGRADED, &entry, sizeof (SGenProtocolAlloc));
243 binary_protocol_copy (gpointer from, gpointer to, gpointer vtable, int size)
245 SGenProtocolCopy entry = { from, to, vtable, size };
246 protocol_entry (SGEN_PROTOCOL_COPY, &entry, sizeof (SGenProtocolCopy));
250 binary_protocol_pin (gpointer obj, gpointer vtable, int size)
252 SGenProtocolPin entry = { obj, vtable, size };
253 protocol_entry (SGEN_PROTOCOL_PIN, &entry, sizeof (SGenProtocolPin));
257 binary_protocol_mark (gpointer obj, gpointer vtable, int size)
259 SGenProtocolMark entry = { obj, vtable, size };
260 protocol_entry (SGEN_PROTOCOL_MARK, &entry, sizeof (SGenProtocolMark));
264 binary_protocol_scan_begin (gpointer obj, gpointer vtable, int size)
266 SGenProtocolScanBegin entry = { obj, vtable, size };
267 protocol_entry (SGEN_PROTOCOL_SCAN_BEGIN, &entry, sizeof (SGenProtocolScanBegin));
271 binary_protocol_scan_vtype_begin (gpointer obj, int size)
273 SGenProtocolScanVTypeBegin entry = { obj, size };
274 protocol_entry (SGEN_PROTOCOL_SCAN_VTYPE_BEGIN, &entry, sizeof (SGenProtocolScanVTypeBegin));
278 binary_protocol_wbarrier (gpointer ptr, gpointer value, gpointer value_vtable)
280 SGenProtocolWBarrier entry = { ptr, value, value_vtable };
281 protocol_entry (SGEN_PROTOCOL_WBARRIER, &entry, sizeof (SGenProtocolWBarrier));
285 binary_protocol_global_remset (gpointer ptr, gpointer value, gpointer value_vtable)
287 SGenProtocolGlobalRemset entry = { ptr, value, value_vtable };
288 protocol_entry (SGEN_PROTOCOL_GLOBAL_REMSET, &entry, sizeof (SGenProtocolGlobalRemset));
292 binary_protocol_ptr_update (gpointer ptr, gpointer old_value, gpointer new_value, gpointer vtable, int size)
294 SGenProtocolPtrUpdate entry = { ptr, old_value, new_value, vtable, size };
295 protocol_entry (SGEN_PROTOCOL_PTR_UPDATE, &entry, sizeof (SGenProtocolPtrUpdate));
299 binary_protocol_cleanup (gpointer ptr, gpointer vtable, int size)
301 SGenProtocolCleanup entry = { ptr, vtable, size };
302 protocol_entry (SGEN_PROTOCOL_CLEANUP, &entry, sizeof (SGenProtocolCleanup));
306 binary_protocol_empty (gpointer start, int size)
308 SGenProtocolEmpty entry = { start, size };
309 protocol_entry (SGEN_PROTOCOL_EMPTY, &entry, sizeof (SGenProtocolEmpty));
313 binary_protocol_thread_suspend (gpointer thread, gpointer stopped_ip)
315 SGenProtocolThreadSuspend entry = { thread, stopped_ip };
316 protocol_entry (SGEN_PROTOCOL_THREAD_SUSPEND, &entry, sizeof (SGenProtocolThreadSuspend));
320 binary_protocol_thread_restart (gpointer thread)
322 SGenProtocolThreadRestart entry = { thread };
323 protocol_entry (SGEN_PROTOCOL_THREAD_RESTART, &entry, sizeof (SGenProtocolThreadRestart));
327 binary_protocol_thread_register (gpointer thread)
329 SGenProtocolThreadRegister entry = { thread };
330 protocol_entry (SGEN_PROTOCOL_THREAD_REGISTER, &entry, sizeof (SGenProtocolThreadRegister));
335 binary_protocol_thread_unregister (gpointer thread)
337 SGenProtocolThreadUnregister entry = { thread };
338 protocol_entry (SGEN_PROTOCOL_THREAD_UNREGISTER, &entry, sizeof (SGenProtocolThreadUnregister));
343 binary_protocol_missing_remset (gpointer obj, gpointer obj_vtable, int offset, gpointer value, gpointer value_vtable, int value_pinned)
345 SGenProtocolMissingRemset entry = { obj, obj_vtable, offset, value, value_vtable, value_pinned };
346 protocol_entry (SGEN_PROTOCOL_MISSING_REMSET, &entry, sizeof (SGenProtocolMissingRemset));
351 binary_protocol_card_scan (gpointer start, int size)
353 SGenProtocolCardScan entry = { start, size };
354 protocol_entry (SGEN_PROTOCOL_CARD_SCAN, &entry, sizeof (SGenProtocolCardScan));
358 binary_protocol_cement (gpointer obj, gpointer vtable, int size)
360 SGenProtocolCement entry = { obj, vtable, size };
361 protocol_entry (SGEN_PROTOCOL_CEMENT, &entry, sizeof (SGenProtocolCement));
365 binary_protocol_cement_reset (void)
367 protocol_entry (SGEN_PROTOCOL_CEMENT_RESET, NULL, 0);
371 binary_protocol_dislink_update (gpointer link, gpointer obj, int track)
373 SGenProtocolDislinkUpdate entry = { link, obj, track };
374 protocol_entry (SGEN_PROTOCOL_DISLINK_UPDATE, &entry, sizeof (SGenProtocolDislinkUpdate));
379 #endif /* HAVE_SGEN_GC */