forked from M-Labs/nac3
modified the with_context api and add error_stack
This commit is contained in:
parent
bf675e0863
commit
132bc101b0
@ -56,8 +56,17 @@ impl<'a> InferenceContext<'a> {
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where
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F: FnOnce(&mut Self) -> R,
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{
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self.stack.level += 1;
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self.start_scope();
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let result = f(self);
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let poped_names = self.end_scope();
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(poped_names, result)
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}
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pub fn start_scope(&mut self) {
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self.stack.level += 1;
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}
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pub fn end_scope(&mut self) -> Vec<(String, Type, Location)> {
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self.stack.level -= 1;
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let mut poped_names = Vec::new();
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while !self.stack.sym_def.is_empty() {
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@ -72,7 +81,7 @@ impl<'a> InferenceContext<'a> {
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break;
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}
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}
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(poped_names, result)
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poped_names
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}
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/// assign a type to an identifier.
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@ -8,7 +8,12 @@ use crate::typecheck::primitives;
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use rustpython_parser::ast;
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use rustpython_parser::ast::fold::Fold;
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impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
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pub struct TypeInferencer<'a> {
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pub ctx: InferenceContext<'a>,
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pub error_stack: Vec<(String, ast::Location)>
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}
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impl<'a> ast::fold::Fold<()> for TypeInferencer<'a> {
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type TargetU = Option<Type>;
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type Error = String;
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@ -17,8 +22,8 @@ impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
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}
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fn fold_expr(&mut self, node: ast::Expr<()>) -> Result<ast::Expr<Self::TargetU>, Self::Error> {
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// assert_eq!(node.custom, None);
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self.error_stack.push((node.node.name().into(), node.location));
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let expr = match &node.node {
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ast::ExprKind::ListComp { .. } => return self.fold_listcomp(node),
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_ => rustpython_parser::ast::fold::fold_expr(self, node)?
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@ -28,7 +33,7 @@ impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
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// compute type info and store in the custom field
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custom: match &expr.node {
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ast::ExprKind::Constant {value, kind: _} => self.infer_constant(value),
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ast::ExprKind::Name {id, ctx: _} => Ok(Some(self.resolve(id)?)),
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ast::ExprKind::Name {id, ctx: _} => Ok(Some(self.ctx.resolve(id)?)),
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ast::ExprKind::List {elts, ctx: _} => self.infer_list(elts),
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ast::ExprKind::Tuple {elts, ctx: _} => self.infer_tuple(elts),
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ast::ExprKind::Attribute {value, attr, ctx: _} => self.infer_attribute(value, attr),
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@ -49,27 +54,27 @@ impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
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}
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}
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impl<'a> InferenceContext<'a> {
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impl<'a> TypeInferencer<'a> {
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fn infer_constant(&self, constant: &ast::Constant) -> Result<Option<Type>, String> {
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match constant {
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ast::Constant::Bool(_) =>
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Ok(Some(self.get_primitive(primitives::BOOL_TYPE))),
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Ok(Some(self.ctx.get_primitive(primitives::BOOL_TYPE))),
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ast::Constant::Int(val) => {
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let int32: Result<i32, _> = val.try_into();
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let int64: Result<i64, _> = val.try_into();
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if int32.is_ok() {
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Ok(Some(self.get_primitive(primitives::INT32_TYPE)))
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Ok(Some(self.ctx.get_primitive(primitives::INT32_TYPE)))
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} else if int64.is_ok() {
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Ok(Some(self.get_primitive(primitives::INT64_TYPE)))
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Ok(Some(self.ctx.get_primitive(primitives::INT64_TYPE)))
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} else {
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Err("Integer out of bound".into())
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}
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},
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ast::Constant::Float(_) =>
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Ok(Some(self.get_primitive(primitives::FLOAT_TYPE))),
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Ok(Some(self.ctx.get_primitive(primitives::FLOAT_TYPE))),
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ast::Constant::Tuple(vals) => {
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let result = vals
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@ -134,16 +139,16 @@ impl<'a> InferenceContext<'a> {
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fn infer_attribute(&self, value: &ast::Expr<Option<Type>>, attr: &str) -> Result<Option<Type>, String> {
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let ty = value.custom.clone().ok_or_else(|| "no value".to_string())?;
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if let TypeEnum::TypeVariable(id) = ty.as_ref() {
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let v = self.get_variable_def(*id);
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let v = self.ctx.get_variable_def(*id);
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if v.bound.is_empty() {
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return Err("no fields on unbounded type variable".into());
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}
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let ty = v.bound[0].get_base(&self).and_then(|v| v.fields.get(attr));
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let ty = v.bound[0].get_base(&self.ctx).and_then(|v| v.fields.get(attr));
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if ty.is_none() {
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return Err("unknown field".into());
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}
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for x in v.bound[1..].iter() {
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let ty1 = x.get_base(&self).and_then(|v| v.fields.get(attr));
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let ty1 = x.get_base(&self.ctx).and_then(|v| v.fields.get(attr));
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if ty1 != ty {
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return Err("unknown field (type mismatch between variants)".into());
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}
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@ -151,7 +156,7 @@ impl<'a> InferenceContext<'a> {
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return Ok(Some(ty.unwrap().clone()));
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}
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match ty.get_base(&self) {
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match ty.get_base(&self.ctx) {
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Some(b) => match b.fields.get(attr) {
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Some(t) => Ok(Some(t.clone())),
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None => Err("no such field".into()),
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@ -164,7 +169,7 @@ impl<'a> InferenceContext<'a> {
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assert_eq!(values.len(), 2);
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let left = values[0].custom.clone().ok_or_else(|| "no value".to_string())?;
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let right = values[1].custom.clone().ok_or_else(|| "no value".to_string())?;
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let b = self.get_primitive(primitives::BOOL_TYPE);
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let b = self.ctx.get_primitive(primitives::BOOL_TYPE);
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if left == b && right == b {
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Ok(Some(b))
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} else {
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@ -174,7 +179,7 @@ impl<'a> InferenceContext<'a> {
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fn infer_bin_ops(&self, left: &ast::Expr<Option<Type>>, op: &ast::Operator, right: &ast::Expr<Option<Type>>) -> Result<Option<Type>, String> {
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inference_core::resolve_call(
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&self,
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&self.ctx,
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Some(left.custom.clone().ok_or_else(|| "no value".to_string())?),
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magic_methods::binop_name(op),
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&[right.custom.clone().ok_or_else(|| "no value".to_string())?])
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@ -182,13 +187,13 @@ impl<'a> InferenceContext<'a> {
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fn infer_unary_ops(&self, op: &ast::Unaryop, operand: &ast::Expr<Option<Type>>) -> Result<Option<Type>, String> {
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if let ast::Unaryop::Not = op {
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if operand.custom == Some(self.get_primitive(primitives::BOOL_TYPE)) {
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Ok(Some(self.get_primitive(primitives::BOOL_TYPE)))
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if operand.custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE)) {
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Ok(Some(self.ctx.get_primitive(primitives::BOOL_TYPE)))
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} else {
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Err("logical not must be applied to bool".into())
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}
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} else {
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inference_core::resolve_call(&self, operand.custom.clone(), magic_methods::unaryop_name(op), &[])
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inference_core::resolve_call(&self.ctx, operand.custom.clone(), magic_methods::unaryop_name(op), &[])
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}
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}
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@ -196,9 +201,9 @@ impl<'a> InferenceContext<'a> {
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if left.custom.is_none() || (!comparators.iter().all(|x| x.custom.is_some())) {
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Err("comparison operands must have type".into())
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} else {
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let bool_type = Some(self.get_primitive(primitives::BOOL_TYPE));
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let bool_type = Some(self.ctx.get_primitive(primitives::BOOL_TYPE));
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let ty_first = inference_core::resolve_call(
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&self,
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&self.ctx,
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Some(left.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?),
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magic_methods::comparison_name(&ops[0]).ok_or_else(|| "unsupported comparison".to_string())?,
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&[comparators[0].custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?])?;
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@ -212,7 +217,7 @@ impl<'a> InferenceContext<'a> {
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.zip(comparators[1..].iter())
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.zip(ops[1..].iter()) {
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let ty = inference_core::resolve_call(
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&self,
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&self.ctx,
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Some(a.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?.clone()),
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magic_methods::comparison_name(op).ok_or_else(|| "unsupported comparison".to_string())?,
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&[b.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?.clone()])?;
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@ -229,14 +234,14 @@ impl<'a> InferenceContext<'a> {
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match &func.node {
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ast::ExprKind::Name {id, ctx: _}
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=> inference_core::resolve_call(
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&self,
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&self.ctx,
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None,
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id,
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&args.iter().map(|x| x.custom.clone().unwrap()).collect::<Vec<_>>()),
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ast::ExprKind::Attribute {value, attr, ctx: _}
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=> inference_core::resolve_call(
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&self,
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&self.ctx,
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Some(value.custom.clone().ok_or_else(|| "no value".to_string())?),
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&attr,
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&args.iter().map(|x| x.custom.clone().unwrap()).collect::<Vec<_>>()),
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@ -252,7 +257,7 @@ impl<'a> InferenceContext<'a> {
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let val_type = value.custom.as_ref().ok_or_else(|| "no value".to_string())?.as_ref();
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if let TypeEnum::ParametricType(primitives::LIST_TYPE, ls) = val_type {
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if let ast::ExprKind::Slice {lower, upper, step} = &slice.node {
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let int32_type = self.get_primitive(primitives::INT32_TYPE);
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let int32_type = self.ctx.get_primitive(primitives::INT32_TYPE);
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let l = lower.as_ref().map_or(
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Ok(&int32_type),
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|x| x.custom.as_ref().ok_or_else(|| "lower bound cannot be typped".to_string()))?;
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@ -268,7 +273,7 @@ impl<'a> InferenceContext<'a> {
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} else {
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Err("slice must be int32 type".into())
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}
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} else if slice.custom == Some(self.get_primitive(primitives::INT32_TYPE)) {
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} else if slice.custom == Some(self.ctx.get_primitive(primitives::INT32_TYPE)) {
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Ok(Some(ls[0].clone()))
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} else {
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Err("slice or index must be int32 type".into())
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@ -290,7 +295,7 @@ impl<'a> InferenceContext<'a> {
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}
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fn infer_if_expr(&self, test: &ast::Expr<Option<Type>>, body: &ast::Expr<Option<Type>>, orelse: &ast::Expr<Option<Type>>) -> Result<Option<Type>, String> {
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if test.custom != Some(self.get_primitive(primitives::BOOL_TYPE)) {
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if test.custom != Some(self.ctx.get_primitive(primitives::BOOL_TYPE)) {
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Err("test should be bool".into())
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} else if body.custom == orelse.custom {
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Ok(body.custom.clone())
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@ -303,7 +308,7 @@ impl<'a> InferenceContext<'a> {
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if generators[0]
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.ifs
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.iter()
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.all(|x| x.custom == Some(self.get_primitive(primitives::BOOL_TYPE))) {
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.all(|x| x.custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE))) {
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Ok(Some(TypeEnum::ParametricType(
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primitives::LIST_TYPE,
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vec![elt.custom.clone().ok_or_else(|| "elements should have value".to_string())?]).into()))
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@ -343,40 +348,43 @@ impl<'a> InferenceContext<'a> {
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.ok_or_else(|| "no value".to_string())?
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.as_ref()
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.clone() {
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self.with_scope(|ctx| -> Result<ast::Expr<Option<Type>>, String> {
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ctx.infer_simple_binding(&target, ls[0].clone())?;
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let elt_folded = Box::new(ctx.fold_expr(*elt)?);
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let target_folded = Box::new(ctx.fold_expr(*target)?);
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let ifs_folded = ifs
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.into_iter()
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.map(|x| ctx.fold_expr(x))
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.collect::<Result<Vec<ast::Expr<Option<Type>>>, _>>()?;
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self.ctx.start_scope();
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self.infer_simple_binding(&target, ls[0].clone())?;
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let elt_folded = Box::new(self.fold_expr(*elt)?);
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let target_folded = Box::new(self.fold_expr(*target)?);
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let ifs_folded = ifs
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.into_iter()
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.map(|x| self.fold_expr(x))
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.collect::<Result<Vec<ast::Expr<Option<Type>>>, _>>()?;
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let result =
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if ifs_folded
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.iter()
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.all(|x| x.custom == Some(ctx.get_primitive(primitives::BOOL_TYPE))) {
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Ok(ast::Expr {
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location,
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custom: Some(TypeEnum::ParametricType(
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primitives::LIST_TYPE,
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vec![elt_folded
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.custom
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.clone()
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.ok_or_else(|| "elements cannot be typped".to_string())?]).into()),
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node: ast::ExprKind::ListComp {
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elt: elt_folded,
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generators: vec![ast::Comprehension {
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target: target_folded,
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ifs: ifs_folded,
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iter: iter_folded,
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is_async
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}]
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}
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})
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} else {
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Err("test must be bool".into())
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}
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}).1
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.iter()
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.all(|x| x.custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE))) {
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Ok(ast::Expr {
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location,
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custom: Some(TypeEnum::ParametricType(
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primitives::LIST_TYPE,
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vec![elt_folded
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.custom
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.clone()
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.ok_or_else(|| "elements cannot be typped".to_string())?]).into()),
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node: ast::ExprKind::ListComp {
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elt: elt_folded,
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generators: vec![ast::Comprehension {
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target: target_folded,
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ifs: ifs_folded,
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iter: iter_folded,
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is_async
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}]
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}
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})
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} else {
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Err("test must be bool".into())
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};
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self.ctx.end_scope();
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result
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} else {
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Err("iteration is supported for list only".into())
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}
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@ -390,10 +398,10 @@ impl<'a> InferenceContext<'a> {
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ast::ExprKind::Name {id, ctx: _} => {
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if id == "_" {
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Ok(())
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} else if self.defined(id) {
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} else if self.ctx.defined(id) {
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Err("duplicated naming".into())
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} else {
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self.assign(id.clone(), ty, name.location)?;
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self.ctx.assign(id.clone(), ty, name.location)?;
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Ok(())
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}
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}
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@ -415,14 +423,13 @@ impl<'a> InferenceContext<'a> {
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_ => Err("not supported".into())
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}
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}
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}
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pub struct ExpressionInferencer<'a> {
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pub ctx: InferenceContext<'a>
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}
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impl<'a> ExpressionInferencer<'a> {
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pub fn fold_expr(&mut self, expr: ast::Expr) -> Result<ast::Expr<Option<Type>>, String> {
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self.ctx.fold_expr(expr)
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fn fold_expr(&mut self, node: ast::Expr<()>) -> Result<ast::Expr<Option<Type>>, String> {
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let result = <Self as ast::fold::Fold<()>>::fold_expr(self, node);
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if result.is_err() {
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println!("{:?}", self.error_stack.pop().unwrap());
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}
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result
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}
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}
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@ -432,7 +439,7 @@ pub mod test {
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use rustpython_parser::ast::Expr;
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use super::*;
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pub fn new_ctx<'a>() -> ExpressionInferencer<'a> {
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pub fn new_ctx<'a>() -> TypeInferencer<'a> {
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struct S;
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impl SymbolResolver for S {
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fn get_symbol_location(&self, _str: &str) -> Option<Location> { None }
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@ -440,7 +447,10 @@ pub mod test {
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fn get_symbol_value(&self, _str: &str) -> Option<SymbolValue> { None }
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}
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ExpressionInferencer {ctx: InferenceContext::new(primitives::basic_ctx(), Box::new(S{}), FileID(3))}
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TypeInferencer {
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ctx: InferenceContext::new(primitives::basic_ctx(), Box::new(S{}), FileID(3)),
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error_stack: Vec::new()
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}
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}
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#[test]
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@ -627,6 +637,8 @@ pub mod test {
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let ast10 = rustpython_parser::parser::parse_expression("4 if False and True else 8").unwrap();
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let ast11 = rustpython_parser::parser::parse_expression("(1, 2, 3, 4)[1]").unwrap();
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let ast12 = rustpython_parser::parser::parse_expression("(1, True, 3, False)[1]").unwrap();
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let ast13 = rustpython_parser::parser::parse_expression("[1, True, 2]").unwrap();
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let folded = inf.fold_expr(ast1).unwrap();
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let folded_2 = inf.fold_expr(ast2).unwrap();
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@ -640,9 +652,11 @@ pub mod test {
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let folded_10 = inf.fold_expr(ast10).unwrap();
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let folded_11 = inf.fold_expr(ast11).unwrap();
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let folded_12 = inf.fold_expr(ast12).unwrap();
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println!("{:?}", folded.custom);
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println!("{:?}", folded_2.custom);
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let folded_13 = inf.fold_expr(ast13);
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println!("{:?}", folded_3.custom);
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println!("{:?}", folded_4.custom);
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println!("{:?}", folded_5.custom);
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