nac3core: option type codegen support

nac3core/src/codegen/expr.rs

@@ -138,6 +138,7 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
             &mut self.unifier,
             self.top_level,
             &mut self.type_cache,
+            &self.primitives,
             ty,
         )
     }
@@ -199,6 +200,22 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
                     val
                 }
             }
+            Constant::None => {
+                match (
+                    self.unifier.get_ty(ty).as_ref(),
+                    self.unifier.get_ty(self.primitives.option).as_ref(),
+                ) {
+                    (
+                        TypeEnum::TObj { obj_id, params, .. },
+                        TypeEnum::TObj { obj_id: opt_id, .. },
+                    ) if *obj_id == *opt_id => self
+                        .get_llvm_type(generator, *params.iter().next().unwrap().1)
+                        .ptr_type(AddressSpace::Generic)
+                        .const_null()
+                        .into(),
+                    _ => unreachable!("must be option type"),
+                }
+            }
             _ => unreachable!(),
         }
     }

nac3core/src/codegen/mod.rs

@@ -259,6 +259,7 @@ fn get_llvm_type<'ctx>(
     unifier: &mut Unifier,
     top_level: &TopLevelContext,
     type_cache: &mut HashMap<Type, BasicTypeEnum<'ctx>>,
+    primitives: &PrimitiveStore,
     ty: Type,
 ) -> BasicTypeEnum<'ctx> {
     use TypeEnum::*;
@@ -268,9 +269,28 @@ fn get_llvm_type<'ctx>(
         let ty_enum = unifier.get_ty(ty);
         let result = match &*ty_enum {
             TObj { obj_id, fields, .. } => {
-                // check to avoid treating primitives as classes
+                // check to avoid treating primitives other than Option as classes
-                if obj_id.0 <= 7 {
+                if obj_id.0 <= 14 {
-                    unreachable!();
+                    match (unifier.get_ty(ty).as_ref(), unifier.get_ty(primitives.option).as_ref())
+                    {
+                        (
+                            TypeEnum::TObj { obj_id, params, .. },
+                            TypeEnum::TObj { obj_id: opt_id, .. },
+                        ) if *obj_id == *opt_id => {
+                            return get_llvm_type(
+                                ctx,
+                                generator,
+                                unifier,
+                                top_level,
+                                type_cache,
+                                primitives,
+                                *params.iter().next().unwrap().1,
+                            )
+                            .ptr_type(AddressSpace::Generic)
+                            .into();
+                        }
+                        _ => unreachable!("must be option type"),
+                    }
                 }
                 // a struct with fields in the order of declaration
                 let top_level_defs = top_level.definitions.read();
@@ -289,6 +309,7 @@ fn get_llvm_type<'ctx>(
                                 unifier,
                                 top_level,
                                 type_cache,
+                                primitives,
                                 fields[&f.0].0,
                             )
                         })
@@ -304,14 +325,14 @@ fn get_llvm_type<'ctx>(
                 // a struct with fields in the order present in the tuple
                 let fields = ty
                     .iter()
-                    .map(|ty| get_llvm_type(ctx, generator, unifier, top_level, type_cache, *ty))
+                    .map(|ty| get_llvm_type(ctx, generator, unifier, top_level, type_cache, primitives, *ty))
                     .collect_vec();
                 ctx.struct_type(&fields, false).into()
             }
             TList { ty } => {
                 // a struct with an integer and a pointer to an array
                 let element_type =
-                    get_llvm_type(ctx, generator, unifier, top_level, type_cache, *ty);
+                    get_llvm_type(ctx, generator, unifier, top_level, type_cache, primitives, *ty);
                 let fields = [
                     element_type.ptr_type(AddressSpace::Generic).into(),
                     generator.get_size_type(ctx).into(),
@@ -417,7 +438,8 @@ pub fn gen_func<'ctx, G: CodeGenerator>(
         exception.set_body(&fields, false);
         exception.ptr_type(AddressSpace::Generic).into()
     });
-    // TODO: insert option type cache
+    // NOTE: special handling of option cannot use this type cache since it contains type var,
+    // handled inside get_llvm_type instead
 
     let (args, ret) = if let ConcreteTypeEnum::TFunc { args, ret, .. } =
         task.store.get(task.signature)
@@ -438,7 +460,7 @@ pub fn gen_func<'ctx, G: CodeGenerator>(
     let ret_type = if unifier.unioned(ret, primitives.none) {
         None
     } else {
-        Some(get_llvm_type(context, generator, &mut unifier, top_level_ctx.as_ref(), &mut type_cache, ret))
+        Some(get_llvm_type(context, generator, &mut unifier, top_level_ctx.as_ref(), &mut type_cache, &primitives, ret))
     };
 
     let has_sret = ret_type.map_or(false, |ty| need_sret(context, ty));
@@ -451,6 +473,7 @@ pub fn gen_func<'ctx, G: CodeGenerator>(
                 &mut unifier,
                 top_level_ctx.as_ref(),
                 &mut type_cache,
+                &primitives,
                 arg.ty,
             )
             .into()
@@ -498,6 +521,7 @@ pub fn gen_func<'ctx, G: CodeGenerator>(
                 &mut unifier,
                 top_level_ctx.as_ref(),
                 &mut type_cache,
+                &primitives,
                 arg.ty,
             ),
             &arg.name.to_string(),

nac3core/src/toplevel/builtins.rs

@@ -105,7 +105,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
         ("__param2__".into(), int64, true),
     ];
 
-    // for option type
+    // for Option, is_some and is_none share the same type
     let (is_some_ty, unwrap_ty, (option_ty_var, option_ty_var_id)) =
         if let TypeEnum::TObj { fields, params, .. } =
             primitives.1.get_ty(primitives.0.option).as_ref()
@@ -222,9 +222,33 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
             instance_to_stmt: Default::default(),
             resolver: None,
             codegen_callback: Some(Arc::new(GenCall::new(Box::new(
-                |ctx, _, fun, args, generator| {
+                |ctx, obj, _, _, generator| {
-                    // TODO:
+                    let obj_val = obj.unwrap().1.clone().to_basic_value_enum(ctx, generator)?;
-                    unimplemented!()
+                    if let BasicValueEnum::PointerValue(ptr) = obj_val {
+                        Ok(Some(ctx.builder.build_is_not_null(ptr, "is_some").into()))
+                    } else {
+                        unreachable!("option must be ptr")
+                    }
+                },
+            )))),
+            loc: None,
+        })),
+        Arc::new(RwLock::new(TopLevelDef::Function {
+            name: "Option.is_none".into(),
+            simple_name: "is_none".into(),
+            signature: is_some_ty.0,
+            var_id: vec![option_ty_var_id],
+            instance_to_symbol: Default::default(),
+            instance_to_stmt: Default::default(),
+            resolver: None,
+            codegen_callback: Some(Arc::new(GenCall::new(Box::new(
+                |ctx, obj, _, _, generator| {
+                    let obj_val = obj.unwrap().1.clone().to_basic_value_enum(ctx, generator)?;
+                    if let BasicValueEnum::PointerValue(ptr) = obj_val {
+                        Ok(Some(ctx.builder.build_is_null(ptr, "is_none").into()))
+                    } else {
+                        unreachable!("option must be ptr")
+                    }
                 },
             )))),
             loc: None,
@@ -238,9 +262,13 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
             instance_to_stmt: Default::default(),
             resolver: None,
             codegen_callback: Some(Arc::new(GenCall::new(Box::new(
-                |ctx, _, fun, args, generator| {
+                |ctx, obj, _, _, generator| {
-                    // TODO:
+                    let obj_val = obj.unwrap().1.clone().to_basic_value_enum(ctx, generator)?;
-                    unimplemented!()
+                    if let BasicValueEnum::PointerValue(ptr) = obj_val {
+                        Ok(Some(ctx.builder.build_load(ptr, "unwrap_some")))
+                    } else {
+                        unreachable!("option must be ptr")
+                    }
                 },
             )))),
             loc: None,
@@ -1176,8 +1204,11 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
             instance_to_stmt: Default::default(),
             resolver: None,
             codegen_callback: Some(Arc::new(GenCall::new(Box::new(
-                |ctx, _, fun, args, generator| {
+                |ctx, _, _fun, args, generator| {
-                    unimplemented!()
+                    let arg_val = args[0].1.clone().to_basic_value_enum(ctx, generator)?;
+                    let alloca = ctx.builder.build_alloca(arg_val.get_type(), "alloca_some");
+                    ctx.builder.build_store(alloca, arg_val);
+                    Ok(Some(alloca.into()))
                 },
             )))),
             loc: None,

nac3core/src/toplevel/helper.rs

@@ -123,6 +123,7 @@ impl TopLevelComposer {
             obj_id: DefinitionId(10),
             fields: vec![
                 ("is_some".into(), (is_some_type_fun_ty, true)),
+                ("is_none".into(), (is_some_type_fun_ty, true)),
                 ("unwrap".into(), (unwrap_fun_ty, true)),
             ]
             .into_iter()