mono/sgen/sgen-client.h

   1 /**
   2  * \file
   3  * SGen client interface.
   4  *
   5  * Copyright (C) 2014 Xamarin Inc
   6  *
   7  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   8  */
   9
  10 #include "mono/sgen/sgen-pointer-queue.h"
  11
  12 /*
  13  * Init whatever needs initing.  This is called relatively early in SGen initialization.
  14  * Must initialized the small ID for the current thread.
  15  */
  16 void sgen_client_init (void);
  17
  18 /*
  19  * The slow path for getting an object's size.  We're passing in the vtable because we've
  20  * already fetched it.
  21  */
  22 mword sgen_client_slow_object_get_size (GCVTable vtable, GCObject* o);
  23
  24 /*
  25  * Fill the given range with a dummy object.  If the range is too short to be filled with an
  26  * object, null it.  Return `TRUE` if the range was filled with an object, `FALSE` if it was
  27  * nulled.
  28  */
  29 gboolean sgen_client_array_fill_range (char *start, size_t size);
  30
  31 /*
  32  * This is called if the nursery clearing policy at `clear-at-gc`, which is usually only
  33  * used for debugging.  If `size` is large enough for the memory to have been filled with a
  34  * dummy, object, zero its header.  Note that there might not actually be a header there.
  35  */
  36 void sgen_client_zero_array_fill_header (void *p, size_t size);
  37
  38 /*
  39  * Return whether the given object is an array fill dummy object.
  40  */
  41 gboolean sgen_client_object_is_array_fill (GCObject *o);
  42
  43 /*
  44  * Return whether the given finalizable object's finalizer is critical, i.e., needs to run
  45  * after all non-critical finalizers have run.
  46  */
  47 gboolean sgen_client_object_has_critical_finalizer (GCObject *obj);
  48
  49 /*
  50  * Called after an object is enqueued for finalization.  This is a very low-level callback.
  51  * It should almost certainly be a NOP.
  52  *
  53  * FIXME: Can we merge this with `sgen_client_object_has_critical_finalizer()`?
  54  */
  55 void sgen_client_object_queued_for_finalization (GCObject *obj);
  56
  57 /*
  58  * Run the given object's finalizer.
  59  */
  60 void sgen_client_run_finalize (GCObject *obj);
  61
  62 /*
  63  * Is called after a collection if there are objects to finalize.  The world is still
  64  * stopped.  This will usually notify the finalizer thread that it needs to run.
  65  */
  66 void sgen_client_finalize_notify (void);
  67
  68 /*
  69  * Returns TRUE if no ephemerons have been marked.  Will be called again if it returned
  70  * FALSE.  If ephemerons are not supported, just return TRUE.
  71  */
  72 gboolean sgen_client_mark_ephemerons (ScanCopyContext ctx);
  73
  74 /*
  75  * Clear ephemeron pairs with unreachable keys.
  76  * We pass the copy func so we can figure out if an array was promoted or not.
  77  */
  78 void sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx);
  79
  80 /*
  81  * May return NULL.  Must be an aligned pointer.
  82  */
  83 gpointer sgen_client_default_metadata (void);
  84 gpointer sgen_client_metadata_for_object (GCObject *obj);
  85
  86 /*
  87  * No action required.
  88  */
  89 void sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle);
  90 void sgen_client_gchandle_destroyed (int handle_type, guint32 handle);
  91 void sgen_client_ensure_weak_gchandles_accessible (void);
  92
  93 /*
  94  * This is called for objects that are larger than one card.  If it's possible to scan only
  95  * parts of the object based on which cards are marked, do so and return TRUE.  Otherwise,
  96  * return FALSE.
  97  */
  98 gboolean sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx);
  99
 100 /*
 101  * Called after nursery objects have been pinned.  No action is necessary.
 102  */
 103 void sgen_client_nursery_objects_pinned (void **definitely_pinned, int count);
 104
 105 /*
 106  * Called at a semi-random point during minor collections.  No action is necessary.
 107  */
 108 void sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue);
 109
 110 /*
 111  * Called at semi-random points during major collections.  No action is necessary.
 112  */
 113 void sgen_client_collecting_major_1 (void);
 114 void sgen_client_collecting_major_2 (void);
 115 void sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue);
 116
 117 /*
 118  * Called after a LOS object has been pinned.  No action is necessary.
 119  */
 120 void sgen_client_pinned_los_object (GCObject *obj);
 121
 122 /*
 123  * Called for every degraded allocation.  No action is necessary.
 124  */
 125 void sgen_client_degraded_allocation (size_t size);
 126
 127 /*
 128  * Called whenever the amount of memory allocated for the managed heap changes.  No action
 129  * is necessary.
 130  */
 131 void sgen_client_total_allocated_heap_changed (size_t allocated_heap_size);
 132
 133 /*
 134  * If the client has registered any internal memory types, this must return a string
 135  * describing the given type.  Only used for debugging.
 136  */
 137 const char* sgen_client_description_for_internal_mem_type (int type);
 138
 139 /*
 140  * Only used for debugging.  `sgen_client_vtable_get_namespace()` may return NULL.
 141  */
 142 gboolean sgen_client_vtable_is_inited (GCVTable vtable);
 143 const char* sgen_client_vtable_get_namespace (GCVTable vtable);
 144 const char* sgen_client_vtable_get_name (GCVTable vtable);
 145
 146 /*
 147  * Called before starting collections.  The world is already stopped.  No action is
 148  * necessary.
 149  */
 150 void sgen_client_pre_collection_checks (void);
 151
 152 /*
 153  * Must set the thread's thread info to `info`.  If the thread's small ID was not already
 154  * initialized in `sgen_client_init()` (for the main thread, usually), it must be done here.
 155  *
 156  * `stack_bottom_fallback` is the value passed through via `sgen_thread_attach()`.
 157  */
 158 void sgen_client_thread_attach (SgenThreadInfo* info);
 159
 160 void sgen_client_thread_detach_with_lock (SgenThreadInfo *p);
 161
 162 /*
 163  * Called on each worker thread when it starts up.  Must initialize the thread's small ID.
 164  */
 165 void sgen_client_thread_register_worker (void);
 166
 167 /*
 168  * The least this function needs to do is scan all registers and thread stacks.  To do this
 169  * conservatively, use `sgen_conservatively_pin_objects_from()`.
 170  */
 171 void sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx);
 172
 173 /*
 174  * Stop and restart the world, i.e., all threads that interact with the managed heap.  For
 175  * single-threaded programs this is a nop.
 176  */
 177 void sgen_client_stop_world (int generation);
 178 void sgen_client_restart_world (int generation, gint64 *stw_time);
 179
 180 /*
 181  * Must return FALSE.  The bridge is not supported outside of Mono.
 182  */
 183 gboolean sgen_client_bridge_need_processing (void);
 184
 185 /*
 186  * None of these should ever be called.
 187  */
 188 void sgen_client_bridge_reset_data (void);
 189 void sgen_client_bridge_processing_stw_step (void);
 190 void sgen_client_bridge_wait_for_processing (void);
 191 void sgen_client_bridge_processing_finish (int generation);
 192 gboolean sgen_client_bridge_is_bridge_object (GCObject *obj);
 193 void sgen_client_bridge_register_finalized_object (GCObject *object);
 194
 195 /*
 196  * No action is necessary.
 197  */
 198 void sgen_client_mark_togglerefs (char *start, char *end, ScanCopyContext ctx);
 199 void sgen_client_clear_togglerefs (char *start, char *end, ScanCopyContext ctx);
 200
 201 /*
 202  * Called to handle `MONO_GC_PARAMS` and `MONO_GC_DEBUG` options.  The `handle` functions
 203  * must return TRUE if they have recognized and processed the option, FALSE otherwise.
 204  */
 205 gboolean sgen_client_handle_gc_param (const char *opt);
 206 void sgen_client_print_gc_params_usage (void);
 207 gboolean sgen_client_handle_gc_debug (const char *opt);
 208 void sgen_client_print_gc_debug_usage (void);
 209
 210 /*
 211  * Called to obtain an identifier for the current location, such as a method pointer. This
 212  * is used for logging the provenances of allocations with the heavy binary protocol.
 213  */
 214 gpointer sgen_client_get_provenance (void);
 215
 216 /*
 217  * Called by the debugging infrastructure to describe pointers that have an invalid vtable.
 218  * Should usually print to `stdout`.
 219  */
 220 void sgen_client_describe_invalid_pointer (GCObject *ptr);
 221
 222 /*
 223  * These client binary protocol functions are called from the respective binary protocol
 224  * functions.  No action is necessary.  We suggest implementing them as inline functions in
 225  * the client header file so that no overhead is incurred if they don't actually do
 226  * anything.
 227  */
 228
 229 #define TYPE_INT int
 230 #define TYPE_LONGLONG long long
 231 #define TYPE_SIZE size_t
 232 #define TYPE_POINTER gpointer
 233 #define TYPE_BOOL gboolean
 234
 235 #define BEGIN_PROTOCOL_ENTRY0(method) \
 236         void sgen_client_ ## method (void);
 237 #define BEGIN_PROTOCOL_ENTRY_HEAVY0(method) \
 238         void sgen_client_ ## method (void);
 239 #define BEGIN_PROTOCOL_ENTRY1(method,t1,f1) \
 240         void sgen_client_ ## method (t1 f1);
 241 #define BEGIN_PROTOCOL_ENTRY_HEAVY1(method,t1,f1) \
 242         void sgen_client_ ## method (t1 f1);
 243 #define BEGIN_PROTOCOL_ENTRY2(method,t1,f1,t2,f2) \
 244         void sgen_client_ ## method (t1 f1, t2 f2);
 245 #define BEGIN_PROTOCOL_ENTRY_HEAVY2(method,t1,f1,t2,f2) \
 246         void sgen_client_ ## method (t1 f1, t2 f2);
 247 #define BEGIN_PROTOCOL_ENTRY3(method,t1,f1,t2,f2,t3,f3) \
 248         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3);
 249 #define BEGIN_PROTOCOL_ENTRY_HEAVY3(method,t1,f1,t2,f2,t3,f3) \
 250         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3);
 251 #define BEGIN_PROTOCOL_ENTRY4(method,t1,f1,t2,f2,t3,f3,t4,f4) \
 252         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3, t4 f4);
 253 #define BEGIN_PROTOCOL_ENTRY_HEAVY4(method,t1,f1,t2,f2,t3,f3,t4,f4) \
 254         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3, t4 f4);
 255 #define BEGIN_PROTOCOL_ENTRY5(method,t1,f1,t2,f2,t3,f3,t4,f4,t5,f5) \
 256         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3, t4 f4, t5 f5);
 257 #define BEGIN_PROTOCOL_ENTRY_HEAVY5(method,t1,f1,t2,f2,t3,f3,t4,f4,t5,f5) \
 258         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3, t4 f4, t5 f5);
 259 #define BEGIN_PROTOCOL_ENTRY6(method,t1,f1,t2,f2,t3,f3,t4,f4,t5,f5,t6,f6) \
 260         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3, t4 f4, t5 f5, t6 f6);
 261 #define BEGIN_PROTOCOL_ENTRY_HEAVY6(method,t1,f1,t2,f2,t3,f3,t4,f4,t5,f5,t6,f6) \
 262         void sgen_client_ ## method (t1 f1, t2 f2, t3 f3, t4 f4, t5 f5, t6 f6);
 263
 264 #define DEFAULT_PRINT()
 265 #define CUSTOM_PRINT(_)
 266
 267 #define IS_ALWAYS_MATCH(_)
 268 #define MATCH_INDEX(_)
 269 #define IS_VTABLE_MATCH(_)
 270
 271 #define END_PROTOCOL_ENTRY
 272 #define END_PROTOCOL_ENTRY_FLUSH
 273 #define END_PROTOCOL_ENTRY_HEAVY
 274
 275 #include "sgen-protocol-def.h"
 276
 277 #undef TYPE_INT
 278 #undef TYPE_LONGLONG
 279 #undef TYPE_SIZE
 280 #undef TYPE_POINTER
 281 #undef TYPE_BOOL
 282
 283 #ifdef SGEN_WITHOUT_MONO
 284 /*
 285  * Get the current thread's thread info.  This will only be called on managed threads.
 286  */
 287 SgenThreadInfo* mono_thread_info_current (void);
 288
 289 /*
 290  * Get the current thread's small ID.  This will be called on managed and worker threads.
 291  */
 292 int mono_thread_info_get_small_id (void);
 293 #endif