gistfile1.txt

--- a/src/spesh/candidate.c
+++ b/src/spesh/candidate.c
@@ -13,10 +13,13 @@ MVMSpeshCandidate * MVM_spesh_candidate_setup(MVMThreadContext *tc,
     MVMint32 num_spesh_slots, num_log_slots, num_guards, *deopts, num_deopts;
     MVMCollectable **spesh_slots, **log_slots;
     char *before, *after;
+    MVMSpeshGraph *sg;
+
+    MVM_gc_allocate_gen2_default_set(tc);
 
     /* Do initial generation of the specialization, working out the argument
      * guards and adding logging. */
-    MVMSpeshGraph *sg = MVM_spesh_graph_create(tc, static_frame);
+    sg = MVM_spesh_graph_create(tc, static_frame);
     if (tc->instance->spesh_log_fh)
         before = MVM_spesh_dump(tc, sg);
     MVM_spesh_args(tc, sg, callsite, args);
@@ -98,6 +101,8 @@ MVMSpeshCandidate * MVM_spesh_candidate_setup(MVMThreadContext *tc,
     }
     uv_mutex_unlock(&tc->instance->mutex_spesh_install);
 
+    MVM_gc_allocate_gen2_default_clear(tc);
+
     free(sc);
     return result;
 }
@@ -109,9 +114,12 @@ MVMSpeshCandidate * MVM_spesh_candidate_setup(MVMThreadContext *tc,
 void MVM_spesh_candidate_specialize(MVMThreadContext *tc, MVMStaticFrame *static_frame,
         MVMSpeshCandidate *candidate) {
     MVMSpeshCode *sc;
+    MVMSpeshGraph *sg;
 
+    MVM_gc_allocate_gen2_default_set(tc);
+    
     /* Obtain the graph, add facts, and do optimization work. */
-    MVMSpeshGraph *sg = candidate->sg;
+    sg = candidate->sg;
     MVM_spesh_facts_discover(tc, sg);
     MVM_spesh_optimize(tc, sg);
 
@@ -155,4 +163,6 @@ void MVM_spesh_candidate_specialize(MVMThreadContext *tc, MVMStaticFrame *static
     MVM_spesh_graph_destroy(tc, sg);
     MVM_barrier();
     candidate->sg = NULL;
+
+    MVM_gc_allocate_gen2_default_clear(tc);
 }