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modified the with_context api and add error_stack

This commit is contained in:
CrescentonC 2021-07-26 13:01:47 +08:00
parent bf675e0863
commit 132bc101b0
2 changed files with 96 additions and 73 deletions
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13
nac3core/src/typecheck/context/inference_context.rs
View File

@ -56,8 +56,17 @@ impl<'a> InferenceContext<'a> {
where
F: FnOnce(&mut Self) -> R,
{
self.stack.level += 1;
self.start_scope();
let result = f(self);
let poped_names = self.end_scope();
(poped_names, result)
}
pub fn start_scope(&mut self) {
self.stack.level += 1;
}
pub fn end_scope(&mut self) -> Vec<(String, Type, Location)> {
self.stack.level -= 1;
let mut poped_names = Vec::new();
while !self.stack.sym_def.is_empty() {
@ -72,7 +81,7 @@ impl<'a> InferenceContext<'a> {
break;
}
}
(poped_names, result)
poped_names
}
/// assign a type to an identifier.

102
nac3core/src/typecheck/expression_inference.rs
View File

@ -8,7 +8,12 @@ use crate::typecheck::primitives;
use rustpython_parser::ast;
use rustpython_parser::ast::fold::Fold;
impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
pub struct TypeInferencer<'a> {
pub ctx: InferenceContext<'a>,
pub error_stack: Vec<(String, ast::Location)>
}
impl<'a> ast::fold::Fold<()> for TypeInferencer<'a> {
type TargetU = Option<Type>;
type Error = String;
@ -17,7 +22,7 @@ impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
}
fn fold_expr(&mut self, node: ast::Expr<()>) -> Result<ast::Expr<Self::TargetU>, Self::Error> {
// assert_eq!(node.custom, None);
self.error_stack.push((node.node.name().into(), node.location));
let expr = match &node.node {
ast::ExprKind::ListComp { .. } => return self.fold_listcomp(node),
@ -28,7 +33,7 @@ impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
// compute type info and store in the custom field
custom: match &expr.node {
ast::ExprKind::Constant {value, kind: _} => self.infer_constant(value),
ast::ExprKind::Name {id, ctx: _} => Ok(Some(self.resolve(id)?)),
ast::ExprKind::Name {id, ctx: _} => Ok(Some(self.ctx.resolve(id)?)),
ast::ExprKind::List {elts, ctx: _} => self.infer_list(elts),
ast::ExprKind::Tuple {elts, ctx: _} => self.infer_tuple(elts),
ast::ExprKind::Attribute {value, attr, ctx: _} => self.infer_attribute(value, attr),
@ -49,27 +54,27 @@ impl<'a> ast::fold::Fold<()> for InferenceContext<'a> {
}
}
impl<'a> InferenceContext<'a> {
impl<'a> TypeInferencer<'a> {
fn infer_constant(&self, constant: &ast::Constant) -> Result<Option<Type>, String> {
match constant {
ast::Constant::Bool(_) =>
Ok(Some(self.get_primitive(primitives::BOOL_TYPE))),
Ok(Some(self.ctx.get_primitive(primitives::BOOL_TYPE))),
ast::Constant::Int(val) => {
let int32: Result<i32, _> = val.try_into();
let int64: Result<i64, _> = val.try_into();
if int32.is_ok() {
Ok(Some(self.get_primitive(primitives::INT32_TYPE)))
Ok(Some(self.ctx.get_primitive(primitives::INT32_TYPE)))
} else if int64.is_ok() {
Ok(Some(self.get_primitive(primitives::INT64_TYPE)))
Ok(Some(self.ctx.get_primitive(primitives::INT64_TYPE)))
} else {
Err("Integer out of bound".into())
}
},
ast::Constant::Float(_) =>
Ok(Some(self.get_primitive(primitives::FLOAT_TYPE))),
Ok(Some(self.ctx.get_primitive(primitives::FLOAT_TYPE))),
ast::Constant::Tuple(vals) => {
let result = vals
@ -134,16 +139,16 @@ impl<'a> InferenceContext<'a> {
fn infer_attribute(&self, value: &ast::Expr<Option<Type>>, attr: &str) -> Result<Option<Type>, String> {
let ty = value.custom.clone().ok_or_else(|| "no value".to_string())?;
if let TypeEnum::TypeVariable(id) = ty.as_ref() {
let v = self.get_variable_def(*id);
let v = self.ctx.get_variable_def(*id);
if v.bound.is_empty() {
return Err("no fields on unbounded type variable".into());
}
let ty = v.bound[0].get_base(&self).and_then(|v| v.fields.get(attr));
let ty = v.bound[0].get_base(&self.ctx).and_then(|v| v.fields.get(attr));
if ty.is_none() {
return Err("unknown field".into());
}
for x in v.bound[1..].iter() {
let ty1 = x.get_base(&self).and_then(|v| v.fields.get(attr));
let ty1 = x.get_base(&self.ctx).and_then(|v| v.fields.get(attr));
if ty1 != ty {
return Err("unknown field (type mismatch between variants)".into());
}
@ -151,7 +156,7 @@ impl<'a> InferenceContext<'a> {
return Ok(Some(ty.unwrap().clone()));
}
match ty.get_base(&self) {
match ty.get_base(&self.ctx) {
Some(b) => match b.fields.get(attr) {
Some(t) => Ok(Some(t.clone())),
None => Err("no such field".into()),
@ -164,7 +169,7 @@ impl<'a> InferenceContext<'a> {
assert_eq!(values.len(), 2);
let left = values[0].custom.clone().ok_or_else(|| "no value".to_string())?;
let right = values[1].custom.clone().ok_or_else(|| "no value".to_string())?;
let b = self.get_primitive(primitives::BOOL_TYPE);
let b = self.ctx.get_primitive(primitives::BOOL_TYPE);
if left == b && right == b {
Ok(Some(b))
} else {
@ -174,7 +179,7 @@ impl<'a> InferenceContext<'a> {
fn infer_bin_ops(&self, left: &ast::Expr<Option<Type>>, op: &ast::Operator, right: &ast::Expr<Option<Type>>) -> Result<Option<Type>, String> {
inference_core::resolve_call(
&self,
&self.ctx,
Some(left.custom.clone().ok_or_else(|| "no value".to_string())?),
magic_methods::binop_name(op),
&[right.custom.clone().ok_or_else(|| "no value".to_string())?])
@ -182,13 +187,13 @@ impl<'a> InferenceContext<'a> {
fn infer_unary_ops(&self, op: &ast::Unaryop, operand: &ast::Expr<Option<Type>>) -> Result<Option<Type>, String> {
if let ast::Unaryop::Not = op {
if operand.custom == Some(self.get_primitive(primitives::BOOL_TYPE)) {
Ok(Some(self.get_primitive(primitives::BOOL_TYPE)))
if operand.custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE)) {
Ok(Some(self.ctx.get_primitive(primitives::BOOL_TYPE)))
} else {
Err("logical not must be applied to bool".into())
}
} else {
inference_core::resolve_call(&self, operand.custom.clone(), magic_methods::unaryop_name(op), &[])
inference_core::resolve_call(&self.ctx, operand.custom.clone(), magic_methods::unaryop_name(op), &[])
}
}
@ -196,9 +201,9 @@ impl<'a> InferenceContext<'a> {
if left.custom.is_none() || (!comparators.iter().all(|x| x.custom.is_some())) {
Err("comparison operands must have type".into())
} else {
let bool_type = Some(self.get_primitive(primitives::BOOL_TYPE));
let bool_type = Some(self.ctx.get_primitive(primitives::BOOL_TYPE));
let ty_first = inference_core::resolve_call(
&self,
&self.ctx,
Some(left.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?),
magic_methods::comparison_name(&ops[0]).ok_or_else(|| "unsupported comparison".to_string())?,
&[comparators[0].custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?])?;
@ -212,7 +217,7 @@ impl<'a> InferenceContext<'a> {
.zip(comparators[1..].iter())
.zip(ops[1..].iter()) {
let ty = inference_core::resolve_call(
&self,
&self.ctx,
Some(a.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?.clone()),
magic_methods::comparison_name(op).ok_or_else(|| "unsupported comparison".to_string())?,
&[b.custom.clone().ok_or_else(|| "comparator must be able to be typed".to_string())?.clone()])?;
@ -229,14 +234,14 @@ impl<'a> InferenceContext<'a> {
match &func.node {
ast::ExprKind::Name {id, ctx: _}
=> inference_core::resolve_call(
&self,
&self.ctx,
None,
id,
&args.iter().map(|x| x.custom.clone().unwrap()).collect::<Vec<_>>()),
ast::ExprKind::Attribute {value, attr, ctx: _}
=> inference_core::resolve_call(
&self,
&self.ctx,
Some(value.custom.clone().ok_or_else(|| "no value".to_string())?),
&attr,
&args.iter().map(|x| x.custom.clone().unwrap()).collect::<Vec<_>>()),
@ -252,7 +257,7 @@ impl<'a> InferenceContext<'a> {
let val_type = value.custom.as_ref().ok_or_else(|| "no value".to_string())?.as_ref();
if let TypeEnum::ParametricType(primitives::LIST_TYPE, ls) = val_type {
if let ast::ExprKind::Slice {lower, upper, step} = &slice.node {
let int32_type = self.get_primitive(primitives::INT32_TYPE);
let int32_type = self.ctx.get_primitive(primitives::INT32_TYPE);
let l = lower.as_ref().map_or(
Ok(&int32_type),
|x| x.custom.as_ref().ok_or_else(|| "lower bound cannot be typped".to_string()))?;
@ -268,7 +273,7 @@ impl<'a> InferenceContext<'a> {
} else {
Err("slice must be int32 type".into())
}
} else if slice.custom == Some(self.get_primitive(primitives::INT32_TYPE)) {
} else if slice.custom == Some(self.ctx.get_primitive(primitives::INT32_TYPE)) {
Ok(Some(ls[0].clone()))
} else {
Err("slice or index must be int32 type".into())
@ -290,7 +295,7 @@ impl<'a> InferenceContext<'a> {
}
fn infer_if_expr(&self, test: &ast::Expr<Option<Type>>, body: &ast::Expr<Option<Type>>, orelse: &ast::Expr<Option<Type>>) -> Result<Option<Type>, String> {
if test.custom != Some(self.get_primitive(primitives::BOOL_TYPE)) {
if test.custom != Some(self.ctx.get_primitive(primitives::BOOL_TYPE)) {
Err("test should be bool".into())
} else if body.custom == orelse.custom {
Ok(body.custom.clone())
@ -303,7 +308,7 @@ impl<'a> InferenceContext<'a> {
if generators[0]
.ifs
.iter()
.all(|x| x.custom == Some(self.get_primitive(primitives::BOOL_TYPE))) {
.all(|x| x.custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE))) {
Ok(Some(TypeEnum::ParametricType(
primitives::LIST_TYPE,
vec![elt.custom.clone().ok_or_else(|| "elements should have value".to_string())?]).into()))
@ -343,18 +348,20 @@ impl<'a> InferenceContext<'a> {
.ok_or_else(|| "no value".to_string())?
.as_ref()
.clone() {
self.with_scope(|ctx| -> Result<ast::Expr<Option<Type>>, String> {
ctx.infer_simple_binding(&target, ls[0].clone())?;
let elt_folded = Box::new(ctx.fold_expr(*elt)?);
let target_folded = Box::new(ctx.fold_expr(*target)?);
self.ctx.start_scope();
self.infer_simple_binding(&target, ls[0].clone())?;
let elt_folded = Box::new(self.fold_expr(*elt)?);
let target_folded = Box::new(self.fold_expr(*target)?);
let ifs_folded = ifs
.into_iter()
.map(|x| ctx.fold_expr(x))
.map(|x| self.fold_expr(x))
.collect::<Result<Vec<ast::Expr<Option<Type>>>, _>>()?;
let result =
if ifs_folded
.iter()
.all(|x| x.custom == Some(ctx.get_primitive(primitives::BOOL_TYPE))) {
.all(|x| x.custom == Some(self.ctx.get_primitive(primitives::BOOL_TYPE))) {
Ok(ast::Expr {
location,
custom: Some(TypeEnum::ParametricType(
@ -375,8 +382,9 @@ impl<'a> InferenceContext<'a> {
})
} else {
Err("test must be bool".into())
}
}).1
};
self.ctx.end_scope();
result
} else {
Err("iteration is supported for list only".into())
}
@ -390,10 +398,10 @@ impl<'a> InferenceContext<'a> {
ast::ExprKind::Name {id, ctx: _} => {
if id == "_" {
Ok(())
} else if self.defined(id) {
} else if self.ctx.defined(id) {
Err("duplicated naming".into())
} else {
self.assign(id.clone(), ty, name.location)?;
self.ctx.assign(id.clone(), ty, name.location)?;
Ok(())
}
}
@ -415,14 +423,13 @@ impl<'a> InferenceContext<'a> {
_ => Err("not supported".into())
}
}
}
pub struct ExpressionInferencer<'a> {
pub ctx: InferenceContext<'a>
fn fold_expr(&mut self, node: ast::Expr<()>) -> Result<ast::Expr<Option<Type>>, String> {
let result = <Self as ast::fold::Fold<()>>::fold_expr(self, node);
if result.is_err() {
println!("{:?}", self.error_stack.pop().unwrap());
}
impl<'a> ExpressionInferencer<'a> {
pub fn fold_expr(&mut self, expr: ast::Expr) -> Result<ast::Expr<Option<Type>>, String> {
self.ctx.fold_expr(expr)
result
}
}
@ -432,7 +439,7 @@ pub mod test {
use rustpython_parser::ast::Expr;
use super::*;
pub fn new_ctx<'a>() -> ExpressionInferencer<'a> {
pub fn new_ctx<'a>() -> TypeInferencer<'a> {
struct S;
impl SymbolResolver for S {
fn get_symbol_location(&self, _str: &str) -> Option<Location> { None }
@ -440,7 +447,10 @@ pub mod test {
fn get_symbol_value(&self, _str: &str) -> Option<SymbolValue> { None }
}
ExpressionInferencer {ctx: InferenceContext::new(primitives::basic_ctx(), Box::new(S{}), FileID(3))}
TypeInferencer {
ctx: InferenceContext::new(primitives::basic_ctx(), Box::new(S{}), FileID(3)),
error_stack: Vec::new()
}
}
#[test]
@ -628,6 +638,8 @@ pub mod test {
let ast11 = rustpython_parser::parser::parse_expression("(1, 2, 3, 4)[1]").unwrap();
let ast12 = rustpython_parser::parser::parse_expression("(1, True, 3, False)[1]").unwrap();
let ast13 = rustpython_parser::parser::parse_expression("[1, True, 2]").unwrap();
let folded = inf.fold_expr(ast1).unwrap();
let folded_2 = inf.fold_expr(ast2).unwrap();
let folded_3 = inf.fold_expr(ast3).unwrap();
@ -641,8 +653,10 @@ pub mod test {
let folded_11 = inf.fold_expr(ast11).unwrap();
let folded_12 = inf.fold_expr(ast12).unwrap();
println!("{:?}", folded.custom);
println!("{:?}", folded_2.custom);
let folded_13 = inf.fold_expr(ast13);
println!("{:?}", folded_3.custom);
println!("{:?}", folded_4.custom);
println!("{:?}", folded_5.custom);