dump moarvm's gen2 roots list (or rather: their respective REPR names)

foo.diff

diff --git a/src/gc/collect.c b/src/gc/collect.c
index 208ec8c..dbd31f8 100644
--- a/src/gc/collect.c
+++ b/src/gc/collect.c
@@ -19,6 +19,26 @@ static void pass_work_item(MVMThreadContext *tc, WorkToPass *wtp, MVMCollectable
 static void pass_leftover_work(MVMThreadContext *tc, WorkToPass *wtp);
 static void add_in_tray_to_worklist(MVMThreadContext *tc, MVMGCWorklist *worklist);
 
+static void analyze_worklist_REPRs(MVMThreadContext *tc, MVMGCWorklist *worklist) {
+    MVMuint32 index;
+
+    fprintf(stderr, "worklist reprs:\n\n");
+
+    for (index = 0; index < worklist->items; index++) {
+        MVMObject *object = (MVMObject *)worklist->list[index][0];
+        if (object->header.flags & MVM_CF_STABLE) {
+            fprintf(stderr, "STable\n");
+        } else {
+            if (STABLE(object)->REPR->name) {
+                fprintf(stderr, "%s\n", STABLE(object)->REPR->name);
+            }
+        }
+    }
+    fprintf(stderr, "frames: %d\n", worklist->frames);
+
+    fprintf(stderr, "\n\n");
+}
+
 /* Does a garbage collection run. Exactly what it does is configured by the
  * couple of arguments that it takes.
  *
@@ -110,6 +130,11 @@ void MVM_gc_collect(MVMThreadContext *tc, MVMuint8 what_to_do, MVMuint8 gen) {
         * collection anyway (in fact, we must not for correctness, otherwise
         * the gen2 rooting keeps them alive forever). */
         if (gen == MVMGCGenerations_Nursery) {
+            MVMGCWorklist *debugworklist = MVM_gc_worklist_create(tc, gen != MVMGCGenerations_Nursery);
+            MVM_gc_root_add_gen2s_to_worklist(tc, debugworklist);
+            analyze_worklist_REPRs(tc, debugworklist);
+            MVM_gc_worklist_destroy(tc, debugworklist);
+
             MVM_gc_root_add_gen2s_to_worklist(tc, worklist);
             GCDEBUG_LOG(tc, MVM_GC_DEBUG_COLLECT, "Thread %d run %d : processing %d items from gen2 \n", worklist->items);
             process_worklist(tc, worklist, &wtp, gen);

frame counts

frames: 1441
frames: 1369
frames: 2641
frames: 2639
frames: 2584
frames: 2584
frames: 2584
frames: 2584
frames: 2663
frames: 2584
frames: 2584
frames: 2584
frames: 2584
frames: 2642
frames: 2585
frames: 2640
frames: 2664
frames: 2585
frames: 2585
frames: 2640
frames: 2664
frames: 2640
frames: 2237
frames: 1973
frames: 3731
frames: 4045
frames: 3523
frames: 3660
frames: 4278
frames: 4381
frames: 4107
frames: 4267
frames: 4276
frames: 4448
frames: 4913
frames: 4949
frames: 5194
frames: 5041
frames: 5003
frames: 5040
frames: 5610
frames: 5363
frames: 5306
frames: 5859
frames: 5682
frames: 6280
frames: 5972
frames: 6542
frames: 6626
frames: 6777
frames: 6427
frames: 6650
frames: 6648
frames: 6838
frames: 7133
frames: 7118
frames: 7275
frames: 7651
frames: 7590
frames: 7809
frames: 8251
frames: 8073
frames: 8189
frames: 8266
frames: 8737
frames: 8853
frames: 8358
frames: 8742
frames: 9195
frames: 9307
frames: 9041
frames: 9381
frames: 9059
frames: 9562
frames: 9280
frames: 9747
frames: 9834
frames: 9978
frames: 10244
frames: 10240
frames: 10029
frames: 10580
frames: 10647
frames: 10211
frames: 10961
frames: 11074
frames: 11233
frames: 11353
frames: 11124
frames: 11314
frames: 11517
frames: 11518
frames: 12313
frames: 11896
frames: 11951
frames: 12268
frames: 12637
frames: 12299
frames: 12575
frames: 12714
frames: 12722
frames: 13290
frames: 13422
frames: 13638
frames: 13247
frames: 13387
frames: 13515
frames: 13471
frames: 14185
frames: 14199
frames: 14418
frames: 14527
frames: 14113
frames: 14176
frames: 14496
frames: 14260
frames: 14691
frames: 14653
frames: 14387
frames: 14954
frames: 15045
frames: 14958
frames: 14787
frames: 15086
frames: 14738
frames: 15040
frames: 15134
frames: 15200
frames: 15230
frames: 15693
frames: 15448
frames: 15615
frames: 15713
frames: 15919
frames: 15864
frames: 16056
frames: 16633
frames: 16580
frames: 16314
frames: 16398
frames: 16464
frames: 16434
frames: 16502
frames: 17004
frames: 16704
frames: 17120
frames: 17310
frames: 16898
frames: 17020
frames: 17168
frames: 17355
frames: 17430
frames: 17550
frames: 17644
frames: 17741
frames: 17866
frames: 17938
frames: 18068
frames: 18180
frames: 18239
frames: 18369
frames: 18467
frames: 18574
frames: 18575
frames: 19180
frames: 18837
frames: 18940
frames: 18963
frames: 19051
frames: 19507
frames: 19223
frames: 19367
frames: 19539
frames: 19661
frames: 20195
frames: 19909
frames: 19981
frames: 20186
frames: 20225
frames: 20295
frames: 20146
frames: 20342
frames: 20404
frames: 20541
frames: 20444
frames: 20596
frames: 21231
frames: 20767
frames: 20823
frames: 20858
frames: 21101
frames: 21381
frames: 21429
frames: 21870
frames: 22052
frames: 22556
frames: 22863
frames: 23516
frames: 24239
frames: 24658
frames: 25294
frames: 25812
frames: 25849
frames: 26447
frames: 26701
frames: 27042
frames: 27212
frames: 27482
frames: 27560
frames: 27701
frames: 27828
frames: 28153
frames: 28487
frames: 28568
frames: 28651
frames: 28269
frames: 28228
frames: 28519
frames: 28669
frames: 28698
frames: 28838
frames: 28968
frames: 29062
frames: 29226
frames: 29316
frames: 29182
frames: 29907
frames: 29704
frames: 29864
frames: 30311
frames: 30375
frames: 30166
frames: 30153
frames: 30313
frames: 30923
frames: 30910
frames: 31078
frames: 31161
frames: 31216
frames: 31425
frames: 31203
frames: 31568
frames: 31776
frames: 31412
frames: 31581
frames: 31962
frames: 31780
frames: 32341
frames: 31916
frames: 32063
frames: 32153
frames: 32317
frames: 32263
frames: 32305
frames: 32311
frames: 32571
frames: 32923
frames: 32863
frames: 32567
frames: 32678
frames: 32877
frames: 32910
frames: 33147
frames: 33105
frames: 33157
frames: 33414
frames: 33539
frames: 33578
frames: 34250
frames: 33794
frames: 33890
frames: 34309
frames: 34309
frames: 34493
frames: 35116
frames: 34740
frames: 35114
frames: 35138
frames: 35731
frames: 35404
frames: 35478
frames: 35617
frames: 35827
frames: 36323
frames: 36432
frames: 36524
frames: 36631
frames: 36256
frames: 36471
frames: 36883
frames: 36923
frames: 36281
frames: 36369
frames: 36827
frames: 36872
frames: 36994
frames: 37105
frames: 37376
frames: 37119
frames: 37376
frames: 38087
frames: 37872
frames: 38007
frames: 38159
frames: 38697
frames: 38838
frames: 39037
frames: 39190
frames: 38803
frames: 38840
frames: 38993
frames: 39049
frames: 39198
frames: 39245
frames: 39344
frames: 39678
frames: 39823
frames: 40134
frames: 40918
frames: 40542
frames: 40948
frames: 41147
frames: 41222
frames: 41321
frames: 41275
frames: 41407
frames: 42259
frames: 41486
frames: 41967
frames: 42162
frames: 42091
frames: 42674
frames: 42884
frames: 43161
frames: 42827
frames: 42935
frames: 43025
frames: 43507
frames: 43291
frames: 43333
frames: 43458
frames: 43385
frames: 43643
frames: 44044
frames: 43890
frames: 43817
frames: 45049
frames: 45341
frames: 45344
frames: 45308
frames: 45366
frames: 45365
frames: 45313
frames: 45368
frames: 45313
frames: 45341
frames: 45378
frames: 45330
frames: 45360
frames: 45380
frames: 45360
frames: 45380
frames: 45382
frames: 45364
frames: 45378
frames: 45348
frames: 45374
frames: 45385
frames: 45365
frames: 45375
frames: 45371
frames: 45394
frames: 45286
frames: 45279
frames: 45286
frames: 45261
frames: 45263
frames: 45253
frames: 45284
frames: 45252
frames: 45276
frames: 45279
frames: 45277
frames: 45267
frames: 45248
frames: 45261
frames: 45254
frames: 45250
frames: 45254
frames: 45292
frames: 45308
frames: 45259
frames: 45299
frames: 45277
frames: 45285
frames: 45278
frames: 45272
frames: 45256
frames: 45285
frames: 45307
frames: 45269
frames: 45308
frames: 45308
frames: 45314
frames: 45289
frames: 45322
frames: 45269
frames: 45322
frames: 45322
frames: 45320
frames: 45322
frames: 45248
frames: 45287
frames: 45270
frames: 45328
frames: 45304
frames: 45295
frames: 45328
frames: 45321
frames: 45327
frames: 45327
frames: 45334
frames: 45327
frames: 45304
frames: 45340
frames: 45315
frames: 45308
frames: 45338
frames: 45318
frames: 45333
frames: 45271
frames: 45320
frames: 45296
frames: 45307
frames: 45259
frames: 45308
frames: 45329
frames: 45304
frames: 45307
frames: 45299
frames: 45302
frames: 45282
frames: 45344
frames: 45335
frames: 45293
frames: 45346
frames: 45344
frames: 45290
frames: 45333
frames: 45322
frames: 45311
frames: 45345
frames: 45288
frames: 45325
frames: 45354
frames: 45358
frames: 45358
frames: 45315
frames: 45358
frames: 50827
frames: 50807
frames: 50807
frames: 50821
frames: 50817
frames: 8402
frames: 8471
frames: 8145
frames: 11875
frames: 12182
frames: 12539
frames: 12425
frames: 13221
frames: 13534
frames: 8387
frames: 8128
frames: 12609
frames: 12723

gistfile1.txt

 489400 P6opaque
 120608 SCRef
  88251 MVMString
  50395 VMArray
  33546 MVMCode
  30656 P6str
  18943 P6num
  14871 P6int
  14556 VMHash
   3483 STable
   2330 Uninstantiable
   1599 Lexotic
   1489 NFA
   1431