generate comment

.gitignore

@@ -8,3 +8,7 @@ target/
 
 # MSVC Windows builds of rustc generate these, which store debugging information
 *.pdb
+
+# Generated by the compiler
+/*.cpp
+/*.out

README.md

@@ -4,7 +4,7 @@ Programming language that compiles to C++!
 ```sml
 fun main: int = do
     @write("Hello, World!\n");
-    return 0;
+    return 69;
 end;
 ```
 

crates/codegen/src/cpp.rs

@@ -22,6 +22,8 @@ impl Codegen {
     }
 
     pub fn gen(&mut self, irs: Vec<IR>) {
+        self.emit(format!("// Auto-generated by hazure compiler version {}\n", env!("CARGO_PKG_VERSION")));
+
         for module in MODULE_INCLUDES {
             self.emit(format!("#include {}\n", module));
         }
@@ -47,7 +49,7 @@ impl Codegen {
             }
             IRKind::Fun { name, return_type_hint, args, body } => {
                 let args = args.iter().map(|arg| format!("{} {}", arg.1, arg.0)).collect::<Vec<_>>().join(", ");
-                format!("{} {}({}) {{\n{}}}\n", return_type_hint, name, args, self.gen_ir(body))
+                format!("{} {}({}) {{\n{};\n}}\n", return_type_hint, name, args, self.gen_ir(body))
             },
             IRKind::Return { value } => {
                 format!("return {};\n", self.gen_ir(value))
@@ -62,6 +64,12 @@ impl Codegen {
             IRKind::If { cond, body, else_body } => {
                 format!("if ({}) {{\n{}}} else {{\n{}}}\n", self.gen_ir(cond), self.gen_ir(body), self.gen_ir(else_body))
             },
+            IRKind::Unary { op, right } => {
+                format!("{}{}", op, self.gen_ir(right))
+            },
+            IRKind::Binary { left, op, right } => {
+                format!("{} {} {}", self.gen_ir(left), op, self.gen_ir(right))
+            },
 
             IRKind::Value { value } => {
                 match value {
@@ -71,6 +79,8 @@ impl Codegen {
                     Value::Ident(value)   => format!("{}", value),
                 }
             },
+
+            #[allow(unreachable_patterns)]
             _ => { dbg!(ir); todo!() },
         }
     }

crates/hir/src/lib.rs

@@ -14,8 +14,9 @@ pub enum IRKind {
     Intrinsic { name: String, args: Vec<Self> },
     Do { body: Vec<Self> },
     If { cond: Box<Self>, body: Box<Self>, else_body: Box<Self> },
-    Value { value: Value },
+    Unary { op: String, right: Box<Self> },
     Binary { op: String, left: Box<Self>, right: Box<Self> },
+    Value { value: Value },
     Return { value: Box<Self> },
 }
 
@@ -60,23 +61,26 @@ macro_rules! if_err_return {
 
 pub fn expr_to_ir(expr: &Expr) -> (Option<IRKind>, Option<LoweringError>) {
     match expr {
-        Expr::Let { name, type_hint, value } => {
-            let value = expr_to_ir(&value.0);
-            if_err_return!(value.1);
+        Expr::Unary { op, rhs } => {
+            let rhs_ir = expr_to_ir(&rhs.0);
+            if_err_return!(rhs_ir.1);
 
-            let value = value.0.unwrap();
-            let ir_kind = IRKind::Define { name: name.clone(), type_hint: type_hint.clone(), value: Box::new(value) };
-            return (Some(ir_kind), None);
+            return (Some(IRKind::Unary { op: op.to_string(), right: Box::new(rhs_ir.0.unwrap()) }), None);
+        }
+
+        Expr::Binary { lhs, op, rhs } => {
+            let lhs_ir = expr_to_ir(&lhs.0);
+            if_err_return!(lhs_ir.1);
+
+            let rhs_ir = expr_to_ir(&rhs.0);
+            if_err_return!(rhs_ir.1);
+
+            return (Some(IRKind::Binary { op: op.to_string(), left: Box::new(lhs_ir.0.unwrap()), right: Box::new(rhs_ir.0.unwrap()) }), None)
         },
 
         Expr::Call { name, args } => {
             let name = match &name.0 {
-                Expr::Identifier(s) => {
-                    if INTRINSICS.contains(&s.as_str()) { s.clone() }
-                    else {
-                        return (None, Some(LoweringError { span: name.1.clone(), message: format!("Unknown intrinsic: {}", s) }));
-                    }
-                }
+                Expr::Identifier(s) => s.clone(),
                 // Should never happen because the parser should have caught this
                 _ => return (None, Some(LoweringError { span: name.1.clone(), message: "Expected identifier".to_string() }))
             };
@@ -92,9 +96,23 @@ pub fn expr_to_ir(expr: &Expr) -> (Option<IRKind>, Option<LoweringError>) {
             return (Some(ir_kind), None);
         },
 
+        Expr::Let { name, type_hint, value } => {
+            let value = expr_to_ir(&value.0);
+            if_err_return!(value.1);
+
+            let value = value.0.unwrap();
+            let ir_kind = IRKind::Define { name: name.clone(), type_hint: type_hint.clone(), value: Box::new(value) };
+            return (Some(ir_kind), None);
+        },
+
         Expr::Intrinsic { name, args } => {
             let name = match &name.0 {
-                Expr::Identifier(s) => s.clone(),
+                Expr::Identifier(s) => {
+                    if INTRINSICS.contains(&s.as_str()) { s.clone() }
+                    else {
+                        return (None, Some(LoweringError { span: name.1.clone(), message: format!("Unknown intrinsic: {}", s) }));
+                    }
+                }
                 _ => return (None, Some(LoweringError { span: name.1.clone(), message: "Expected identifier".to_string() }))
             };
             let mut largs = Vec::new();

example/69.hz

@@ -0,0 +1,14 @@
+fun add2 (lhs: int) (rhs: int): int = do
+    return lhs + rhs;
+end;
+
+fun main: int = do
+    let result: int = add2(34, 35);
+    @write(result);
+    @write("\n");
+    if result == 69 then
+        @write("big cool")
+    else
+        @write("not cool")
+    end;
+end;

example/ex.hz

@@ -1,4 +0,0 @@
-fun main: int = do
-    @write("Hello, World!\n");
-    return 0;
-end;

example/hello_world.hz

@@ -0,0 +1,4 @@
+fun main: int = do
+    @writesss("Hello, World!\n");
+    return 69;
+end;