lab17: init

lab17/op-codes.js

@@ -0,0 +1,33 @@
+'use strict';
+
+let opcodes = {
+  0x01: { mnemonic: 'ADD', evaluate: (vm) => {
+    let v1 = vm.stack.pop();
+    let v2 = vm.stack.pop();
+    vm.stack.push(v1+v2);
+  }},
+  0x02: { mnemonic: 'MUL', evaluate: (vm) => {
+    //
+    // **YOUR CODE HERE**
+    //
+    // Pop the top two arguments off of the stack,
+    // and then push the result on to the stack.
+  }},
+  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
+    // clear that it is worth the bother.
+  }},
+  0x60: { mnemonic: 'PUSH1', evaluate: (vm) => {
+    // The next byte is data, not another instruction
+    vm.pc++;
+    let v = vm.bytecode.readUInt8(vm.pc);
+    vm.stack.push(v);
+  }},
+  0x0c: { mnemonic: 'PRINT', evaluate: (vm) => {
+    // **NOTE**: This is not a real EVM opcode.
+    console.log(vm.stack.pop());
+  }},
+};
+
+exports.opcodes = opcodes;