From 376a1217a63291fb6714430b1a4dfd64909906c9 Mon Sep 17 00:00:00 2001
From: David Li <li.davidm96@gmail.com>
Date: Sun, 26 Nov 2017 19:33:08 -0500
Subject: Translate binop (only num + num)

---
 src/semantic/analysis.rs  | 4 ++--
 src/semantic/translate.rs | 9 +++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/semantic/analysis.rs b/src/semantic/analysis.rs
index cf19351..09832c4 100644
--- a/src/semantic/analysis.rs
+++ b/src/semantic/analysis.rs
@@ -218,8 +218,8 @@ fn trans_exp<'a, F: frame::Frame>(
                 &Add => {
                     match (left_ty, right_ty) {
                         (Ty::Int, Ty::Int) => {
-                            err!(exp, TypeError::Unimplemented)
-                            // Ok(Ty::Int)
+                            Ok((tr.make_binop(ir::Binop::Plus, left_exp, right_exp),
+                                Ty::Int))
                         }
                         (Ty::String, Ty::String) => {
                             err!(exp, TypeError::Unimplemented)
diff --git a/src/semantic/translate.rs b/src/semantic/translate.rs
index 179eb62..bcbad3a 100644
--- a/src/semantic/translate.rs
+++ b/src/semantic/translate.rs
@@ -48,4 +48,13 @@ impl<F: frame::Frame> Translate<F> {
     pub fn make_num(&mut self, num: u64) -> Expression {
         Expression::Exp(ir::Expression::Const(num))
     }
+
+    pub fn make_binop(&mut self, op: ir::Binop,
+                      left: Expression, right: Expression) -> Expression {
+        match (left, right) {
+            (Expression::Exp(left), Expression::Exp(right)) =>
+                Expression::Exp(ir::Expression::Binop(op, Box::new(left), Box::new(right))),
+            _ => panic!("Can't make binop from Void"),
+        }
+    }
 }
-- 
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