Chapter 25.3 & 25.4

1 files changed, 11 insertions, 0 deletions

diff --git a/clox/src/object.h b/clox/src/object.h
index f650b30..e6b842d 100644
--- a/clox/src/object.h
+++ b/clox/src/object.h
@@ -23,6 +23,7 @@ typedef enum {
   OBJ_FUNCTION,
   OBJ_NATIVE,
   OBJ_STRING,
+  OBJ_UPVALUE,
 } ObjType;
 
 struct Obj {
@@ -52,9 +53,18 @@ struct ObjString {
   uint32_t hash;
 };
 
+typedef struct ObjUpvalue {
+  Obj obj;
+  Value *location;
+  Value closed;
+  struct ObjUpvalue *next;
+} ObjUpvalue;
+
 typedef struct {
   Obj obj;
   ObjFunction *function;
+  ObjUpvalue **upvalues;
+  int upvalueCount;
 } ObjClosure;
 
 ObjClosure *newClosure(ObjFunction *function);
@@ -62,6 +72,7 @@ ObjFunction *newFunction();
 ObjNative *newNative(NativeFn function);
 ObjString *takeString(char *chars, int length);
 ObjString *copyString(const char *chars, int length);
+ObjUpvalue *newUpvalue(Value *slot);
 void printObject(Value value);
 
 static inline bool isObjType(Value value, ObjType type) {