Chapter 21

1 files changed, 11 insertions, 2 deletions

diff --git a/clox/src/vm.c b/clox/src/vm.c
index 5e35abd..80e11c3 100644
--- a/clox/src/vm.c
+++ b/clox/src/vm.c
@@ -119,8 +119,8 @@ static InterpretResult run() {
       ObjString *name = READ_STRING();
       Value value;
       if (!tableGet(&vm.globals, name, &value)) {
-	runtimeError("Undefined variable '%s'.", name->chars);
-	return INTERPRET_RUNTIME_ERROR;
+        runtimeError("Undefined variable '%s'.", name->chars);
+        return INTERPRET_RUNTIME_ERROR;
       }
       push(value);
       break;
@@ -131,6 +131,15 @@ static InterpretResult run() {
       pop();
       break;
     }
+    case OP_SET_GLOBAL: {
+      ObjString *name = READ_STRING();
+      if (tableSet(&vm.globals, name, peek(0))) {
+        tableDelete(&vm.globals, name);
+        runtimeError("Undefined variable '%s'.", name->chars);
+        return INTERPRET_RUNTIME_ERROR;
+      }
+      break;
+    }
     case OP_EQUAL: {
       Value b = pop();
       Value a = pop();