288 lines
12 KiB
Rust
288 lines
12 KiB
Rust
use crate::typecheck::typedef::TypeEnum;
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use super::type_inferencer::Inferencer;
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use super::typedef::Type;
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use nac3parser::ast::{self, Expr, ExprKind, Stmt, StmtKind, StrRef};
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use std::{collections::HashSet, iter::once};
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impl<'a> Inferencer<'a> {
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fn should_have_value(&mut self, expr: &Expr<Option<Type>>) -> Result<(), String> {
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if matches!(expr.custom, Some(ty) if self.unifier.unioned(ty, self.primitives.none)) {
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Err(format!("Error at {}: cannot have value none", expr.location))
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} else {
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Ok(())
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}
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}
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fn check_pattern(
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&mut self,
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pattern: &Expr<Option<Type>>,
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defined_identifiers: &mut HashSet<StrRef>,
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) -> Result<(), String> {
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match &pattern.node {
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ExprKind::Name { id, .. } => {
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if !defined_identifiers.contains(id) {
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defined_identifiers.insert(*id);
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}
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self.should_have_value(pattern)?;
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Ok(())
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}
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ExprKind::Tuple { elts, .. } => {
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for elt in elts.iter() {
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self.check_pattern(elt, defined_identifiers)?;
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self.should_have_value(elt)?;
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}
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Ok(())
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}
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ExprKind::Subscript { value, slice, .. } => {
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self.check_expr(value, defined_identifiers)?;
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self.should_have_value(value)?;
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self.check_expr(slice, defined_identifiers)?;
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if let TypeEnum::TTuple { .. } = &*self.unifier.get_ty(value.custom.unwrap()) {
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return Err(format!(
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"Error at {}: cannot assign to tuple element",
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value.location
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));
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}
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Ok(())
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}
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_ => self.check_expr(pattern, defined_identifiers),
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}
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}
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fn check_expr(
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&mut self,
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expr: &Expr<Option<Type>>,
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defined_identifiers: &mut HashSet<StrRef>,
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) -> Result<(), String> {
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// there are some cases where the custom field is None
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if let Some(ty) = &expr.custom {
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if !self.unifier.is_concrete(*ty, &self.function_data.bound_variables) {
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return Err(format!(
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"expected concrete type at {} but got {}",
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expr.location,
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self.unifier.get_ty(*ty).get_type_name()
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));
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}
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}
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match &expr.node {
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ExprKind::Name { id, .. } => {
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self.should_have_value(expr)?;
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if !defined_identifiers.contains(id) {
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if self
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.function_data
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.resolver
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.get_symbol_type(
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self.unifier,
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&self.top_level.definitions.read(),
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self.primitives,
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*id,
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)
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.is_some()
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{
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defined_identifiers.insert(*id);
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} else {
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return Err(format!(
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"unknown identifier {} (use before def?) at {}",
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id, expr.location
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));
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}
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}
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}
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ExprKind::List { elts, .. }
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| ExprKind::Tuple { elts, .. }
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| ExprKind::BoolOp { values: elts, .. } => {
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for elt in elts.iter() {
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self.check_expr(elt, defined_identifiers)?;
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self.should_have_value(elt)?;
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}
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}
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ExprKind::Attribute { value, .. } => {
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self.check_expr(value, defined_identifiers)?;
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self.should_have_value(value)?;
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}
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ExprKind::BinOp { left, right, .. } => {
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self.check_expr(left, defined_identifiers)?;
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self.check_expr(right, defined_identifiers)?;
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self.should_have_value(left)?;
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self.should_have_value(right)?;
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}
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ExprKind::UnaryOp { operand, .. } => {
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self.check_expr(operand, defined_identifiers)?;
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self.should_have_value(operand)?;
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}
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ExprKind::Compare { left, comparators, .. } => {
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for elt in once(left.as_ref()).chain(comparators.iter()) {
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self.check_expr(elt, defined_identifiers)?;
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self.should_have_value(elt)?;
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}
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}
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ExprKind::Subscript { value, slice, .. } => {
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self.should_have_value(value)?;
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self.check_expr(value, defined_identifiers)?;
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self.check_expr(slice, defined_identifiers)?;
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}
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ExprKind::IfExp { test, body, orelse } => {
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self.check_expr(test, defined_identifiers)?;
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self.check_expr(body, defined_identifiers)?;
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self.check_expr(orelse, defined_identifiers)?;
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}
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ExprKind::Slice { lower, upper, step } => {
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for elt in [lower.as_ref(), upper.as_ref(), step.as_ref()].iter().flatten() {
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self.should_have_value(elt)?;
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self.check_expr(elt, defined_identifiers)?;
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}
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}
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ExprKind::Lambda { args, body } => {
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let mut defined_identifiers = defined_identifiers.clone();
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for arg in args.args.iter() {
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// TODO: should we check the types here?
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if !defined_identifiers.contains(&arg.node.arg) {
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defined_identifiers.insert(arg.node.arg);
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}
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}
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self.check_expr(body, &mut defined_identifiers)?;
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}
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ExprKind::ListComp { elt, generators, .. } => {
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// in our type inference stage, we already make sure that there is only 1 generator
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let ast::Comprehension { target, iter, ifs, .. } = &generators[0];
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self.check_expr(iter, defined_identifiers)?;
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self.should_have_value(iter)?;
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let mut defined_identifiers = defined_identifiers.clone();
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self.check_pattern(target, &mut defined_identifiers)?;
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self.should_have_value(target)?;
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for term in once(elt.as_ref()).chain(ifs.iter()) {
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self.check_expr(term, &mut defined_identifiers)?;
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self.should_have_value(term)?;
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}
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}
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ExprKind::Call { func, args, keywords } => {
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for expr in once(func.as_ref())
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.chain(args.iter())
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.chain(keywords.iter().map(|v| v.node.value.as_ref()))
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{
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self.check_expr(expr, defined_identifiers)?;
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self.should_have_value(expr)?;
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}
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}
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ExprKind::Constant { .. } => {}
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_ => {
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println!("{:?}", expr.node);
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unimplemented!()
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}
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}
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Ok(())
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}
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// check statements for proper identifier def-use and return on all paths
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fn check_stmt(
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&mut self,
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stmt: &Stmt<Option<Type>>,
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defined_identifiers: &mut HashSet<StrRef>,
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) -> Result<bool, String> {
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match &stmt.node {
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StmtKind::For { target, iter, body, orelse, .. } => {
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self.check_expr(iter, defined_identifiers)?;
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self.should_have_value(iter)?;
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let mut local_defined_identifiers = defined_identifiers.clone();
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for stmt in orelse.iter() {
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self.check_stmt(stmt, &mut local_defined_identifiers)?;
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}
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let mut local_defined_identifiers = defined_identifiers.clone();
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self.check_pattern(target, &mut local_defined_identifiers)?;
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self.should_have_value(target)?;
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for stmt in body.iter() {
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self.check_stmt(stmt, &mut local_defined_identifiers)?;
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}
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Ok(false)
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}
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StmtKind::If { test, body, orelse } => {
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self.check_expr(test, defined_identifiers)?;
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self.should_have_value(test)?;
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let mut body_identifiers = defined_identifiers.clone();
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let mut orelse_identifiers = defined_identifiers.clone();
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let body_returned = self.check_block(body, &mut body_identifiers)?;
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let orelse_returned = self.check_block(orelse, &mut orelse_identifiers)?;
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for ident in body_identifiers.iter() {
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if !defined_identifiers.contains(ident) && orelse_identifiers.contains(ident) {
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defined_identifiers.insert(*ident);
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}
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}
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Ok(body_returned && orelse_returned)
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}
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StmtKind::While { test, body, orelse } => {
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self.check_expr(test, defined_identifiers)?;
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self.should_have_value(test)?;
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let mut defined_identifiers = defined_identifiers.clone();
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self.check_block(body, &mut defined_identifiers)?;
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self.check_block(orelse, &mut defined_identifiers)?;
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Ok(false)
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}
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StmtKind::With { items, body, .. } => {
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let mut new_defined_identifiers = defined_identifiers.clone();
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for item in items.iter() {
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self.check_expr(&item.context_expr, defined_identifiers)?;
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if let Some(var) = item.optional_vars.as_ref() {
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self.check_pattern(var, &mut new_defined_identifiers)?;
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}
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}
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self.check_block(body, &mut new_defined_identifiers)?;
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Ok(false)
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}
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StmtKind::Expr { value } => {
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self.check_expr(value, defined_identifiers)?;
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Ok(false)
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}
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StmtKind::Assign { targets, value, .. } => {
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self.check_expr(value, defined_identifiers)?;
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self.should_have_value(value)?;
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for target in targets {
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self.check_pattern(target, defined_identifiers)?;
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}
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Ok(false)
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}
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StmtKind::AnnAssign { target, value, .. } => {
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if let Some(value) = value {
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self.check_expr(value, defined_identifiers)?;
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self.should_have_value(value)?;
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self.check_pattern(target, defined_identifiers)?;
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}
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Ok(false)
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}
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StmtKind::Return { value } => {
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if let Some(value) = value {
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self.check_expr(value, defined_identifiers)?;
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self.should_have_value(value)?;
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}
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Ok(true)
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}
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StmtKind::Raise { exc, .. } => {
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if let Some(value) = exc {
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self.check_expr(value, defined_identifiers)?;
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}
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Ok(true)
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}
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// break, raise, etc.
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_ => Ok(false),
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}
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}
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pub fn check_block(
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&mut self,
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block: &[Stmt<Option<Type>>],
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defined_identifiers: &mut HashSet<StrRef>,
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) -> Result<bool, String> {
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let mut ret = false;
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for stmt in block {
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if ret {
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return Err(format!("dead code at {:?}", stmt.location));
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}
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if self.check_stmt(stmt, defined_identifiers)? {
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ret = true;
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}
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}
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Ok(ret)
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}
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}
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