From a107593b6b362fb68e409c9d7b79427776d137d7 Mon Sep 17 00:00:00 2001
From: LLLL Colonq <llll@colonq>
Date: Tue, 1 Sep 2026 20:59:47 -0400
Subject: pit: Tail call optimization!

---
 pit/src/runtime/gc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'pit/src/runtime/gc.c')

diff --git a/pit/src/runtime/gc.c b/pit/src/runtime/gc.c
index 1cc6547..e96e36b 100644
--- a/pit/src/runtime/gc.c
+++ b/pit/src/runtime/gc.c
@@ -27,7 +27,9 @@ static pit_value gc_copy_value(pit_runtime *rt, pit_value v) {
         return v;
     }
 }
+// #include <stdio.h>
 void pit_gc(pit_runtime *rt) {
+    // fprintf(stderr, "running gc: heap size is %ld\n", rt->heap->next);
     rt->frozen_values = 0;
     rt->frozen_symtab = 0;
     pit_arena *fromspace = rt->heap;
@@ -60,6 +62,11 @@ void pit_gc(pit_runtime *rt) {
         pit_value *v = pit_vec_get(pit_value)(rt->saved_bindings, i);
         if (v != NULL) *v = gc_copy_value(rt, *v); /* TODO warn on failure here? */
     }
+    /* the evaluation stack is reachable */
+    for (i64 i = 0; i < rt->result_stack->next; ++i) {
+        pit_value *v = pit_vec_get(pit_value)(rt->result_stack, i);
+        if (v != NULL) *v = gc_copy_value(rt, *v); /* TODO warn on failure here? */
+    }
     /* recursively populate all reachable values from that initial set */
     for (i64 scan = 0; scan < tospace->next; ++scan) {
         pit_value_heavy *h = pit_arena_get(tospace, scan);
@@ -106,4 +113,5 @@ void pit_gc(pit_runtime *rt) {
     rt->annotations = tospace_ann;
     rt->annotations_backbuffer = fromspace_ann;
     pit_hashtable_reset(pit_ref, pit_annotation)(rt->annotations_backbuffer);
+    // fprintf(stderr, "done! heap size is %ld\n", rt->heap->next);
 }
-- 
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