Add addition binop

src/ast.cpp

@@ -4,13 +4,22 @@
 
 namespace AST {
     int operator_precedence(BinOp& op) {
-        return 0;
+        switch (op) {
+        case BinOp::Assignment:
+            return 1000;
+        case BinOp::Add:
+            return 10;
+        default:
+            return 1000;
+        }
     }
 
     std::string format_operator(BinOp& op) {
         switch (op) {
         case BinOp::Assignment:
             return "=";
+        case BinOp::Add:
+            return "+";
         default:
             return "??";
         }

src/ast.h

@@ -10,6 +10,7 @@
 namespace AST {
     enum class BinOp {
         Assignment,
+        Add,
     };
 
     int operator_precedence(BinOp& op);

src/codegen.cpp

@@ -38,17 +38,17 @@ namespace AST {
 
     codegen::StackValue BinaryOperationExpression::codegen(codegen::Builder& builder, codegen::Scope& scope) {
         auto lvalued = scope.with_lvalue();
-        auto lhs = this->m_lhs->codegen(builder, lvalued);
+        auto lhs = this->m_lhs->codegen(builder, this->m_binop == BinOp::Assignment ? lvalued : scope);
         auto rhs = this->m_rhs->codegen(builder, scope);
         switch (this->m_binop) {
         case BinOp::Assignment:
             builder.builder->CreateStore(rhs.value, lhs.value, false);
-            if (scope.is_lvalue) {
-                return lhs;
-            }
-            else {
             return rhs;
-            }
+        case BinOp::Add:
+            return codegen::StackValue{
+                builder.builder->CreateAdd(lhs.value, rhs.value, "add"),
+                lhs.ty
+            };
         default:
             throw std::runtime_error("invalid binop");
         }

src/parsing.cpp

@@ -54,6 +54,10 @@ namespace parsing {
                     stream.m_position = inner.m_position;
                     return new AST::BinOp{ AST::BinOp::Assignment };
                 }
+                if (token.content == "+") {
+                    stream.m_position = inner.m_position;
+                    return new AST::BinOp{ AST::BinOp::Add };
+                }
 
                 throw std::runtime_error("Expected binop");
             }

test.c

@@ -1,5 +1,5 @@
 int main() {
     int a = 5;
-    a = 15;
-    return a;
+    a = 15 + 20;
+    return a + 30;
 }