lab17: part 5

lab17/op-codes.js

@@ -27,6 +27,17 @@ let opcodes = {
     let value = vm.stack.pop();
     vm.memory[offset] = value;
   }},
+  0x56: { mnemonic: 'JUMP', evaluate: (vm) => {
+    let offset = vm.stack.pop();
+    vm.pc = offset;
+  }},
+  0x57: { mnemonic: 'JUMPI', evaluate: (vm) => {
+    let offset = vm.stack.pop();
+    let condition = vm.stack.pop();
+    if (condition) {
+      vm.pc = offset;
+    }
+  }},
   0x5B: { mnemonic: 'JUMPDEST', evaluate: (vm) => {
     // Does nothing.  We could check to make sure that jumps
     // always land at JUMPDEST opcodes, but it is not totally