modgc: Implement return value for gc.collect(), enable on Unix.

1 files changed, 10 insertions, 0 deletions

diff --git a/py/gc.c b/py/gc.c
index 87c458f82c..7fab0409a9 100644
--- a/py/gc.c
+++ b/py/gc.c
@@ -231,7 +231,14 @@ STATIC void gc_deal_with_stack_overflow(void) {
     }
 }
 
+#if MICROPY_PY_GC_COLLECT_RETVAL
+uint gc_collected;
+#endif
+
 STATIC void gc_sweep(void) {
+    #if MICROPY_PY_GC_COLLECT_RETVAL
+    gc_collected = 0;
+    #endif
     // free unmarked heads and their tails
     int free_tail = 0;
     for (machine_uint_t block = 0; block < gc_alloc_table_byte_len * BLOCKS_PER_ATB; block++) {
@@ -254,6 +261,9 @@ STATIC void gc_sweep(void) {
                 }
 #endif
                 free_tail = 1;
+                #if MICROPY_PY_GC_COLLECT_RETVAL
+                gc_collected++;
+                #endif
                 // fall through to free the head
 
             case AT_TAIL: