From 9b60cf334cdb030759c54f700d5c122338c5b3a8 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Thu, 29 Jul 2021 23:56:42 -0700
Subject: Chapter 15.3.1

---
 clox/src/vm.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

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

diff --git a/clox/src/vm.c b/clox/src/vm.c
index e05a0c8..a775acb 100644
--- a/clox/src/vm.c
+++ b/clox/src/vm.c
@@ -25,6 +25,12 @@ Value pop() {
 static InterpretResult run() {
 #define READ_BYTE() (*vm.ip++)
 #define READ_CONSTANT() (vm.chunk->constants.values[READ_BYTE()])
+#define BINARY_OP(op)                                                          \
+  do {                                                                         \
+    double b = pop();                                                          \
+    double a = pop();                                                          \
+    push(a op b);                                                              \
+  } while (false)
 
   for (;;) {
 #ifdef DEBUG_TRACE_EXECUTION
@@ -45,6 +51,18 @@ static InterpretResult run() {
       push(constant);
       break;
     }
+    case OP_ADD:
+      BINARY_OP(+);
+      break;
+    case OP_SUBTRACT:
+      BINARY_OP(-);
+      break;
+    case OP_MULTIPLY:
+      BINARY_OP(*);
+      break;
+    case OP_DIVIDE:
+      BINARY_OP(/);
+      break;
     case OP_NEGATE:
       push(-pop());
       break;
@@ -58,6 +76,7 @@ static InterpretResult run() {
 
 #undef READ_BYTE
 #undef READ_CONSTANT
+#undef BINARY_OP
 }
 
 InterpretResult interpret(Chunk *chunk) {
-- 
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