1 files changed, 5 insertions, 1 deletions

diff --git a/src/lj_obj.h b/src/lj_obj.h
index 137a04b2..7890e54b 100644
--- a/src/lj_obj.h
+++ b/src/lj_obj.h
@@ -321,6 +321,10 @@ typedef struct GCproto {
 /* Top bits used for counting created closures. */
 #define PROTO_CLCOUNT           0x20    /* Base of saturating 3 bit counter. */
 #define PROTO_CLC_BITS          3
+#define PROTO_CLC_POLY          (3*PROTO_CLCOUNT)  /* Polymorphic threshold. */
+
+#define PROTO_UV_LOCAL          0x8000  /* Upvalue for local slot. */
+#define PROTO_UV_IMMUTABLE      0x4000  /* Immutable upvalue. */
 
 #define proto_kgc(pt, idx) \
   check_exp((uintptr_t)(intptr_t)(idx) >= (uintptr_t)-(intptr_t)(pt)->sizekgc, \
@@ -342,7 +346,7 @@ typedef struct GCproto {
 typedef struct GCupval {
   GCHeader;
   uint8_t closed;       /* Set if closed (i.e. uv->v == &uv->u.value). */
-  uint8_t unused;
+  uint8_t immutable;    /* Immutable value. */
   union {
     TValue tv;          /* If closed: the value itself. */
     struct {            /* If open: double linked list, anchored at thread. */