From 63527558a72fb56d11d1166ce958dcfc8a765482 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Fri, 12 Aug 2022 20:13:25 -0700
Subject: Chapter 27.1

---
 clox/src/memory.c | 9 +++++++++
 clox/src/object.c | 9 +++++++++
 clox/src/object.h | 9 +++++++++
 3 files changed, 27 insertions(+)

diff --git a/clox/src/memory.c b/clox/src/memory.c
index d1e0c5a..677feed 100644
--- a/clox/src/memory.c
+++ b/clox/src/memory.c
@@ -76,6 +76,11 @@ static void blackenObject(Obj *object) {
   printf("\n");
 #endif
   switch (object->type) {
+  case OBJ_CLASS: {
+    ObjClass *klass = (ObjClass *)object;
+    markObject((Obj *)klass->name);
+    break;
+  }
   case OBJ_CLOSURE: {
     ObjClosure *closure = (ObjClosure *)object;
     markObject((Obj *)closure->function);
@@ -105,6 +110,10 @@ static void freeObject(Obj *object) {
 #endif // DEBUG_LOG_GC
 
   switch (object->type) {
+  case OBJ_CLASS: {
+    FREE(ObjClass, object);
+    break;
+  }
   case OBJ_CLOSURE: {
     ObjClosure *closure = (ObjClosure *)object;
     FREE_ARRAY(ObjUpvalue *, closure->upvalues, closure->upvalueCount);
diff --git a/clox/src/object.c b/clox/src/object.c
index 376742f..935a258 100644
--- a/clox/src/object.c
+++ b/clox/src/object.c
@@ -25,6 +25,12 @@ static Obj *allocateObject(size_t size, ObjType type) {
   return object;
 }
 
+ObjClass *newClass(ObjString *name) {
+  ObjClass *klass = ALLOCATE_OBJ(ObjClass, OBJ_CLASS);
+  klass->name = name;
+  return klass;
+}
+
 ObjClosure *newClosure(ObjFunction *function) {
   ObjUpvalue **upvalues = ALLOCATE(ObjUpvalue *, function->upvalueCount);
   for (int i = 0; i < function->upvalueCount; i++) {
@@ -116,6 +122,9 @@ static void printFunction(ObjFunction *function) {
 
 void printObject(Value value) {
   switch (OBJ_TYPE(value)) {
+  case OBJ_CLASS:
+    printf("%s", AS_CLASS(value)->name->chars);
+    break;
   case OBJ_CLOSURE:
     printFunction(AS_CLOSURE(value)->function);
     break;
diff --git a/clox/src/object.h b/clox/src/object.h
index 36ec034..44de6ed 100644
--- a/clox/src/object.h
+++ b/clox/src/object.h
@@ -7,11 +7,13 @@
 
 #define OBJ_TYPE(value) (AS_OBJ(value)->type)
 
+#define IS_CLASS(value) isObjType(value, OBJ_CLASS)
 #define IS_CLOSURE(value) isObjType(value, OBJ_CLOSURE)
 #define IS_FUNCTION(value) isObjType(value, OBJ_FUNCTION)
 #define IS_NATIVE(value) isObjType(value, OBJ_NATIVE)
 #define IS_STRING(value) isObjType(value, OBJ_STRING)
 
+#define AS_CLASS(value) ((ObjClass *)AS_OBJ(value))
 #define AS_CLOSURE(value) ((ObjClosure *)AS_OBJ(value))
 #define AS_FUNCTION(value) ((ObjFunction *)AS_OBJ(value))
 #define AS_NATIVE(value) (((ObjNative *)AS_OBJ(value))->function)
@@ -19,6 +21,7 @@
 #define AS_CSTRING(value) (((ObjString *)AS_OBJ(value))->chars)
 
 typedef enum {
+  OBJ_CLASS,
   OBJ_CLOSURE,
   OBJ_FUNCTION,
   OBJ_NATIVE,
@@ -68,6 +71,12 @@ typedef struct {
   int upvalueCount;
 } ObjClosure;
 
+typedef struct {
+  Obj obj;
+  ObjString *name;
+} ObjClass;
+
+ObjClass *newClass(ObjString *name);
 ObjClosure *newClosure(ObjFunction *function);
 ObjFunction *newFunction();
 ObjNative *newNative(NativeFn function);
-- 
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