init function check

nac3core/src/typecheck/function_check.rs

@@ -0,0 +1,76 @@
+use super::type_inferencer::Inferencer;
+use super::typedef::Type;
+use rustpython_parser::ast::{self, Expr, ExprKind, StmtKind};
+use std::iter::once;
+
+impl<'a> Inferencer<'a> {
+    fn check_expr(
+        &mut self,
+        expr: &Expr<Option<Type>>,
+        defined_identifiers: &[String],
+    ) -> Result<(), String> {
+        if let Some(ty) = &expr.custom {
+            let ty = self.unifier.get_ty(*ty);
+            let ty = ty.as_ref().borrow();
+            if ty.is_concrete() {
+                return Err(format!(
+                    "expected concrete type at {:?} but got {}",
+                    expr.location,
+                    ty.get_type_name()
+                ));
+            }
+        }
+        match &expr.node {
+            ExprKind::Name { id, .. } => {
+                if !defined_identifiers.contains(id) {
+                    return Err(format!("unknown identifier {} (use before def?)", id));
+                }
+            }
+            ExprKind::List { elts, .. }
+            | ExprKind::Tuple { elts, .. }
+            | ExprKind::BoolOp { values: elts, .. } => {
+                for elt in elts.iter() {
+                    self.check_expr(elt, defined_identifiers)?;
+                }
+            }
+            ExprKind::Attribute { value, .. } => {
+                self.check_expr(value.as_ref(), defined_identifiers)?;
+            }
+            ExprKind::BinOp { left, right, .. } => {
+                self.check_expr(left.as_ref(), defined_identifiers)?;
+                self.check_expr(right.as_ref(), defined_identifiers)?;
+            }
+            ExprKind::UnaryOp { operand, .. } => {
+                self.check_expr(operand.as_ref(), defined_identifiers)?;
+            }
+            ExprKind::Compare {
+                left, comparators, ..
+            } => {
+                for elt in once(left.as_ref()).chain(comparators.iter()) {
+                    self.check_expr(elt, defined_identifiers)?;
+                }
+            }
+            ExprKind::Subscript { value, slice, .. } => {
+                self.check_expr(value.as_ref(), defined_identifiers)?;
+                self.check_expr(slice.as_ref(), defined_identifiers)?;
+            }
+            ExprKind::IfExp { test, body, orelse } => {
+                self.check_expr(test.as_ref(), defined_identifiers)?;
+                self.check_expr(body.as_ref(), defined_identifiers)?;
+                self.check_expr(orelse.as_ref(), defined_identifiers)?;
+            }
+            ExprKind::Slice { lower, upper, step } => {
+                for elt in [lower.as_ref(), upper.as_ref(), step.as_ref()]
+                    .iter()
+                    .flatten()
+                {
+                    self.check_expr(elt, defined_identifiers)?;
+                }
+            }
+            ExprKind::ListComp { .. } => unimplemented!(),
+            ExprKind::Lambda { .. } => unimplemented!(),
+            _ => {}
+        }
+        Ok(())
+    }
+}

nac3core/src/typecheck/mod.rs

@@ -5,3 +5,4 @@ pub mod symbol_resolver;
 pub mod typedef;
 pub mod type_inferencer;
 mod unification_table;
+mod function_check;

nac3core/src/typecheck/type_inferencer/mod.rs

@@ -31,7 +31,7 @@ pub struct Inferencer<'a> {
     pub variable_mapping: HashMap<String, Type>,
     pub calls: &'a mut Vec<Rc<Call>>,
     pub primitives: &'a PrimitiveStore,
-    pub return_type: Option<Type>
+    pub return_type: Option<Type>,
 }
 
 struct NaiveFolder();
@@ -107,8 +107,7 @@ impl<'a> fold::Fold<()> for Inferencer<'a> {
                 }
             }
             ast::StmtKind::AnnAssign { .. } | ast::StmtKind::Expr { .. } => {}
-            ast::StmtKind::Return { value } => {
+            ast::StmtKind::Return { value } => match (value, self.return_type) {
-                match (value, self.return_type) {
                 (Some(v), Some(v1)) => {
                     self.unifier.unify(v.custom.unwrap(), v1)?;
                 }
@@ -119,8 +118,7 @@ impl<'a> fold::Fold<()> for Inferencer<'a> {
                     return Err("Expected return value".to_string());
                 }
                 (None, None) => {}
-                }
+            },
-            }
             _ => return Err("Unsupported statement type".to_string()),
         };
         Ok(stmt)
@@ -151,7 +149,7 @@ impl<'a> fold::Fold<()> for Inferencer<'a> {
                 attr,
                 ctx: _,
             } => Some(self.infer_attribute(value, attr)?),
-            ast::ExprKind::BoolOp { op: _, values } => Some(self.infer_bool_ops(values)?),
+            ast::ExprKind::BoolOp { values, .. } => Some(self.infer_bool_ops(values)?),
             ast::ExprKind::BinOp { left, op, right } => Some(self.infer_bin_ops(left, op, right)?),
             ast::ExprKind::UnaryOp { op, operand } => Some(self.infer_unary_ops(op, operand)?),
             ast::ExprKind::Compare {
@@ -242,7 +240,7 @@ impl<'a> Inferencer<'a> {
             variable_mapping,
             calls: self.calls,
             primitives: self.primitives,
-            return_type: self.return_type
+            return_type: self.return_type,
         };
         let fun = FunSignature {
             args: fn_args
@@ -291,7 +289,7 @@ impl<'a> Inferencer<'a> {
             variable_mapping,
             calls: self.calls,
             primitives: self.primitives,
-            return_type: self.return_type
+            return_type: self.return_type,
         };
         let elt = new_context.fold_expr(elt)?;
         let generator = generators.pop().unwrap();
@@ -392,24 +390,12 @@ impl<'a> Inferencer<'a> {
                         return Err("Integer out of bound".into());
                     }
                     return Ok(Located {
-                        location,
-                        custom,
-                        node: ExprKind::Call {
-                            func: Box::new(Located {
-                                custom: None,
-                                location: func.location,
-                                node: ExprKind::Name { id, ctx },
-                            }),
-                            args: vec![Located {
                         location: args[0].location,
                         custom,
                         node: ExprKind::Constant {
                             value: ast::Constant::Int(val.clone()),
                             kind: kind.clone(),
                         },
-                            }],
-                            keywords: vec![],
-                        },
                     });
                 }
             }

nac3core/src/typecheck/typedef/mod.rs

@@ -46,7 +46,6 @@ pub struct FunSignature {
 #[derive(Clone)]
 pub enum TypeEnum {
     TVar {
-        // TODO: upper/lower bound
         id: u32,
     },
     TSeq {
@@ -102,6 +101,17 @@ impl TypeEnum {
             TypeEnum::TFunc { .. } => "TFunc",
         }
     }
+
+    pub fn is_concrete(&self) -> bool {
+        matches!(
+            self,
+            TypeEnum::TTuple { .. }
+                | TypeEnum::TList { .. }
+                | TypeEnum::TObj { .. }
+                | TypeEnum::TVirtual { .. }
+                | TypeEnum::TFunc { .. }
+        )
+    }
 }
 
 pub struct Unifier {