Chapter 21.3

1 files changed, 10 insertions, 0 deletions

diff --git a/clox/src/vm.c b/clox/src/vm.c
index 709f3d1..5e35abd 100644
--- a/clox/src/vm.c
+++ b/clox/src/vm.c
@@ -115,6 +115,16 @@ static InterpretResult run() {
     case OP_POP:
       pop();
       break;
+    case OP_GET_GLOBAL: {
+      ObjString *name = READ_STRING();
+      Value value;
+      if (!tableGet(&vm.globals, name, &value)) {
+	runtimeError("Undefined variable '%s'.", name->chars);
+	return INTERPRET_RUNTIME_ERROR;
+      }
+      push(value);
+      break;
+    }
     case OP_DEFINE_GLOBAL: {
       ObjString *name = READ_STRING();
       tableSet(&vm.globals, name, peek(0));