From 7bd9934a4be7c22b8f464ab7a1cc243801b5957c Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Mon, 11 Oct 2021 00:13:15 -0700
Subject: Chapter 21.3

---
 clox/src/vm.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'clox/src/vm.c')

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));
-- 
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