[wasm] Implement GC support. Embedder must provide main loop pumping function request...

[mono.git] / mono / sgen / sgen-gc.c

diff --git a/mono/sgen/sgen-gc.c b/mono/sgen/sgen-gc.c
index 54ff725b22b3c169e7234dffde1a626cf11ee9c2..4c3454823fdd42c2f5e0073a87f650601d6b84bf 100644 (file)
--- a/mono/sgen/sgen-gc.c
+++ b/mono/sgen/sgen-gc.c
@@ -195,6 +195,7 @@
 
 #include <mono/utils/memcheck.h>
 #include <mono/utils/mono-mmap-internals.h>
+#include <mono/utils/unlocked.h>
 
 #undef pthread_create
 #undef pthread_join
@@ -336,13 +337,6 @@ nursery_canaries_enabled (void)
 
 #define safe_object_get_size   sgen_safe_object_get_size
 
-#if defined(HAVE_CONC_GC_AS_DEFAULT)
-/* Use concurrent major on deskstop platforms */
-#define DEFAULT_MAJOR SGEN_MAJOR_CONCURRENT
-#else
-#define DEFAULT_MAJOR SGEN_MAJOR_SERIAL
-#endif
-
 typedef enum {
        SGEN_MAJOR_DEFAULT,
        SGEN_MAJOR_SERIAL,
@@ -1862,7 +1856,7 @@ collect_nursery (const char *reason, gboolean is_overflow, SgenGrayQueue *unpin_
        major_collector.finish_nursery_collection ();
 
        TV_GETTIME (last_minor_collection_end_tv);
-       InterlockedAdd64 (&gc_stats.minor_gc_time, TV_ELAPSED (last_minor_collection_start_tv, last_minor_collection_end_tv));
+       UnlockedAdd64 (&gc_stats.minor_gc_time, TV_ELAPSED (last_minor_collection_start_tv, last_minor_collection_end_tv));
 
        sgen_debug_dump_heap ("minor", InterlockedRead (&gc_stats.minor_gc_count) - 1, NULL);
 
@@ -2356,7 +2350,7 @@ major_do_collection (const char *reason, gboolean is_overflow, gboolean forced)
        sgen_gray_object_queue_dispose (&gc_thread_gray_queue);
 
        TV_GETTIME (time_end);
-       InterlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (time_start, time_end));
+       UnlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (time_start, time_end));
 
        /* FIXME: also report this to the user, preferably in gc-end. */
        if (major_collector.get_and_reset_num_major_objects_marked)
@@ -2392,7 +2386,7 @@ major_start_concurrent_collection (const char *reason)
        num_objects_marked = major_collector.get_and_reset_num_major_objects_marked ();
 
        TV_GETTIME (time_end);
-       InterlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (time_start, time_end));
+       UnlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (time_start, time_end));
 
        current_collection_generation = -1;
 }
@@ -2420,7 +2414,7 @@ major_update_concurrent_collection (void)
        sgen_los_update_cardtable_mod_union ();
 
        TV_GETTIME (total_end);
-       InterlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (total_start, total_end));
+       UnlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (total_start, total_end));
 }
 
 static void
@@ -2442,7 +2436,7 @@ major_finish_concurrent_collection (gboolean forced)
        sgen_workers_stop_all_workers (GENERATION_OLD);
 
        SGEN_TV_GETTIME (time_major_conc_collection_end);
-       InterlockedAdd64 (&gc_stats.major_gc_time_concurrent, SGEN_TV_ELAPSED (time_major_conc_collection_start, time_major_conc_collection_end));
+       UnlockedAdd64 (&gc_stats.major_gc_time_concurrent, SGEN_TV_ELAPSED (time_major_conc_collection_start, time_major_conc_collection_end));
 
        major_collector.update_cardtable_mod_union ();
        sgen_los_update_cardtable_mod_union ();
@@ -2457,7 +2451,7 @@ major_finish_concurrent_collection (gboolean forced)
        sgen_gray_object_queue_dispose (&gc_thread_gray_queue);
 
        TV_GETTIME (total_end);
-       InterlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (total_start, total_end));
+       UnlockedAdd64 (&gc_stats.major_gc_time, TV_ELAPSED (total_start, total_end));
 
        current_collection_generation = -1;
 }
@@ -2509,7 +2503,7 @@ sgen_ensure_free_space (size_t size, int generation)
  * LOCKING: Assumes the GC lock is held.
  */
 void
-sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish, gboolean stw)
+sgen_perform_collection_inner (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish, gboolean stw)
 {
        TV_DECLARE (gc_total_start);
        TV_DECLARE (gc_total_end);
@@ -2588,6 +2582,52 @@ sgen_perform_collection (size_t requested_size, int generation_to_collect, const
                sgen_restart_world (oldest_generation_collected);
 }
 
+#ifdef HOST_WASM
+
+typedef struct {
+       size_t requested_size;
+       int generation_to_collect;
+       const char *reason;
+} SgenGcRequest;
+
+static SgenGcRequest gc_request;
+static gboolean pending_request;
+
+extern void request_gc_cycle (void);
+
+#include <emscripten.h>
+
+EMSCRIPTEN_KEEPALIVE void
+mono_gc_pump_callback (void)
+{
+       if (!pending_request)
+               return;
+       pending_request = FALSE;
+       sgen_perform_collection_inner (gc_request.requested_size, gc_request.generation_to_collect, gc_request.reason, TRUE, TRUE);     
+}
+#endif
+
+void
+sgen_perform_collection (size_t requested_size, int generation_to_collect, const char *reason, gboolean wait_to_finish, gboolean stw)
+{
+#ifdef HOST_WASM
+       g_assert (stw); //can't handle non-stw mode (IE, domain unload)
+       //we ignore wait_to_finish
+       if (!pending_request || gc_request.generation_to_collect <= generation_to_collect) { //no active request or request was for a smaller part of the heap
+               gc_request.requested_size = requested_size;
+               gc_request.generation_to_collect = generation_to_collect;
+               gc_request.reason = reason;
+               if (!pending_request) {
+                       request_gc_cycle ();
+                       pending_request = TRUE;
+               }
+       }
+
+       degraded_mode = 1; //enable degraded mode so allocation can continue
+#else
+       sgen_perform_collection_inner (requested_size, generation_to_collect, reason, wait_to_finish, stw);
+#endif
+}
 /*
  * ######################################################################
  * ########  Memory allocation from the OS