Universally quantified type variables
Implement universally quantified type variables, both explicitly given by the user and inferred by the type inference algorithm.
This commit is contained in:
parent
7960c3270e
commit
ecb4c0f803
17 changed files with 634 additions and 111 deletions
14
Cargo.lock
generated
14
Cargo.lock
generated
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@ -5,7 +5,9 @@ name = "achilles"
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version = "0.1.0"
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dependencies = [
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"anyhow",
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"bimap",
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"clap",
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"crate-root",
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"derive_more",
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"inkwell",
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"itertools",
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@ -57,6 +59,12 @@ version = "1.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
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[[package]]
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name = "bimap"
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version = "0.6.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f92b72b8f03128773278bf74418b9205f3d2a12c39a61f92395f47af390c32bf"
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[[package]]
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name = "bit-set"
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version = "0.5.2"
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@ -140,6 +148,12 @@ dependencies = [
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"syn",
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]
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[[package]]
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name = "crate-root"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "59c6fe4622b269032d2c5140a592d67a9c409031d286174fcde172fbed86f0d3"
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[[package]]
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name = "derive_more"
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version = "0.99.11"
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@ -6,6 +6,7 @@ edition = "2018"
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[dependencies]
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anyhow = "1.0.38"
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bimap = "0.6.0"
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clap = "3.0.0-beta.2"
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derive_more = "0.99.11"
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inkwell = { git = "https://github.com/TheDan64/inkwell", branch = "master", features = ["llvm11-0"] }
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@ -18,3 +19,6 @@ pratt = "0.3.0"
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proptest = "1.0.0"
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test-strategy = "0.1.1"
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thiserror = "1.0.24"
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[dev-dependencies]
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crate-root = "0.1.3"
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@ -1,3 +1,3 @@
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fn id x = x
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fn plus x y = x + y
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fn plus (x: int) (y: int) = x + y
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fn main = plus (id 2) 7
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@ -222,6 +222,12 @@ pub enum Decl<'a, T> {
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}
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impl<'a, T> Decl<'a, T> {
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pub fn type_(&self) -> &T {
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match self {
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Decl::Fun { type_, .. } => type_,
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}
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}
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pub fn traverse_type<F, U, E>(self, f: F) -> Result<Decl<'a, U>, E>
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where
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F: Fn(T) -> Result<U, E> + Clone,
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162
src/ast/mod.rs
162
src/ast/mod.rs
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@ -1,6 +1,7 @@
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pub(crate) mod hir;
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use std::borrow::Cow;
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use std::collections::HashMap;
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use std::convert::TryFrom;
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use std::fmt::{self, Display, Formatter};
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@ -126,7 +127,7 @@ impl<'a> Literal<'a> {
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#[derive(Debug, PartialEq, Eq, Clone)]
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pub struct Binding<'a> {
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pub ident: Ident<'a>,
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pub type_: Option<Type>,
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pub type_: Option<Type<'a>>,
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pub body: Expr<'a>,
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}
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@ -134,7 +135,7 @@ impl<'a> Binding<'a> {
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fn to_owned(&self) -> Binding<'static> {
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Binding {
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ident: self.ident.to_owned(),
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type_: self.type_.clone(),
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type_: self.type_.as_ref().map(|t| t.to_owned()),
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body: self.body.to_owned(),
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}
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}
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@ -177,7 +178,7 @@ pub enum Expr<'a> {
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Ascription {
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expr: Box<Expr<'a>>,
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type_: Type,
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type_: Type<'a>,
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},
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}
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@ -215,20 +216,46 @@ impl<'a> Expr<'a> {
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},
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Expr::Ascription { expr, type_ } => Expr::Ascription {
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expr: Box::new((**expr).to_owned()),
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type_: type_.clone(),
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type_: type_.to_owned(),
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},
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}
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}
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}
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#[derive(Debug, PartialEq, Eq, Clone)]
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pub struct Arg<'a> {
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pub ident: Ident<'a>,
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pub type_: Option<Type<'a>>,
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}
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impl<'a> Arg<'a> {
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pub fn to_owned(&self) -> Arg<'static> {
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Arg {
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ident: self.ident.to_owned(),
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type_: self.type_.as_ref().map(Type::to_owned),
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}
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}
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}
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impl<'a> TryFrom<&'a str> for Arg<'a> {
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type Error = <Ident<'a> as TryFrom<&'a str>>::Error;
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fn try_from(value: &'a str) -> Result<Self, Self::Error> {
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Ok(Arg {
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ident: Ident::try_from(value)?,
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type_: None,
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})
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}
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}
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#[derive(Debug, PartialEq, Eq, Clone)]
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pub struct Fun<'a> {
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pub args: Vec<Ident<'a>>,
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pub args: Vec<Arg<'a>>,
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pub body: Expr<'a>,
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}
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impl<'a> Fun<'a> {
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fn to_owned(&self) -> Fun<'static> {
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pub fn to_owned(&self) -> Fun<'static> {
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Fun {
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args: self.args.iter().map(|arg| arg.to_owned()).collect(),
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body: self.body.to_owned(),
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@ -236,40 +263,147 @@ impl<'a> Fun<'a> {
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}
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}
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#[derive(Debug, PartialEq, Eq)]
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#[derive(Debug, PartialEq, Eq, Clone)]
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pub enum Decl<'a> {
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Fun { name: Ident<'a>, body: Fun<'a> },
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}
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////
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#[derive(Debug, PartialEq, Eq, Clone)]
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pub struct FunctionType {
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pub args: Vec<Type>,
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pub ret: Box<Type>,
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pub struct FunctionType<'a> {
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pub args: Vec<Type<'a>>,
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pub ret: Box<Type<'a>>,
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}
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impl Display for FunctionType {
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impl<'a> FunctionType<'a> {
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pub fn to_owned(&self) -> FunctionType<'static> {
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FunctionType {
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args: self.args.iter().map(|a| a.to_owned()).collect(),
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ret: Box::new((*self.ret).to_owned()),
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}
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}
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}
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impl<'a> Display for FunctionType<'a> {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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write!(f, "fn {} -> {}", self.args.iter().join(", "), self.ret)
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}
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}
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#[derive(Debug, PartialEq, Eq, Clone)]
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pub enum Type {
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pub enum Type<'a> {
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Int,
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Float,
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Bool,
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CString,
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Function(FunctionType),
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Var(Ident<'a>),
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Function(FunctionType<'a>),
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}
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impl Display for Type {
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impl<'a> Type<'a> {
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pub fn to_owned(&self) -> Type<'static> {
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match self {
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Type::Int => Type::Int,
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Type::Float => Type::Float,
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Type::Bool => Type::Bool,
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Type::CString => Type::CString,
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Type::Var(v) => Type::Var(v.to_owned()),
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Type::Function(f) => Type::Function(f.to_owned()),
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}
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}
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pub fn alpha_equiv(&self, other: &Self) -> bool {
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fn do_alpha_equiv<'a>(
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substs: &mut HashMap<&'a Ident<'a>, &'a Ident<'a>>,
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lhs: &'a Type,
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rhs: &'a Type,
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) -> bool {
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match (lhs, rhs) {
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(Type::Var(v1), Type::Var(v2)) => substs.entry(v1).or_insert(v2) == &v2,
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(
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Type::Function(FunctionType {
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args: args1,
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ret: ret1,
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}),
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Type::Function(FunctionType {
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args: args2,
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ret: ret2,
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}),
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) => {
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args1.len() == args2.len()
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&& args1
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.iter()
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.zip(args2)
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.all(|(a1, a2)| do_alpha_equiv(substs, a1, a2))
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&& do_alpha_equiv(substs, ret1, ret2)
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}
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_ => lhs == rhs,
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}
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}
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let mut substs = HashMap::new();
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do_alpha_equiv(&mut substs, self, other)
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}
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}
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impl<'a> Display for Type<'a> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Type::Int => f.write_str("int"),
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Type::Float => f.write_str("float"),
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Type::Bool => f.write_str("bool"),
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Type::CString => f.write_str("cstring"),
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Type::Var(v) => v.fmt(f),
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Type::Function(ft) => ft.fmt(f),
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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fn type_var(n: &str) -> Type<'static> {
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Type::Var(Ident::try_from(n.to_owned()).unwrap())
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}
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mod alpha_equiv {
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use super::*;
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#[test]
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fn trivial() {
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assert!(Type::Int.alpha_equiv(&Type::Int));
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assert!(!Type::Int.alpha_equiv(&Type::Bool));
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}
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#[test]
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fn simple_type_var() {
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assert!(type_var("a").alpha_equiv(&type_var("b")));
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}
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#[test]
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fn function_with_type_vars_equiv() {
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assert!(Type::Function(FunctionType {
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args: vec![type_var("a")],
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ret: Box::new(type_var("b")),
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})
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.alpha_equiv(&Type::Function(FunctionType {
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args: vec![type_var("b")],
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ret: Box::new(type_var("a")),
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})))
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}
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#[test]
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fn function_with_type_vars_non_equiv() {
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assert!(!Type::Function(FunctionType {
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args: vec![type_var("a")],
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ret: Box::new(type_var("a")),
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})
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.alpha_equiv(&Type::Function(FunctionType {
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args: vec![type_var("b")],
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ret: Box::new(type_var("a")),
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})))
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}
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}
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}
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@ -15,13 +15,13 @@ pub struct Check {
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expr: Option<String>,
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}
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fn run_expr(expr: String) -> Result<Type> {
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fn run_expr(expr: String) -> Result<Type<'static>> {
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let (_, parsed) = parser::expr(&expr)?;
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let hir_expr = tc::typecheck_expr(parsed)?;
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Ok(hir_expr.type_().clone())
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Ok(hir_expr.type_().to_owned())
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}
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fn run_path(path: PathBuf) -> Result<Type> {
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fn run_path(path: PathBuf) -> Result<Type<'static>> {
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todo!()
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}
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@ -1,4 +1,6 @@
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pub(crate) mod env;
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pub(crate) mod error;
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pub(crate) mod namer;
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pub use error::{Error, Result};
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pub use namer::{Namer, NamerOf};
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122
src/common/namer.rs
Normal file
122
src/common/namer.rs
Normal file
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@ -0,0 +1,122 @@
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use std::fmt::Display;
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use std::marker::PhantomData;
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pub struct Namer<T, F> {
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make_name: F,
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counter: u64,
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_phantom: PhantomData<T>,
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}
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impl<T, F> Namer<T, F> {
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pub fn new(make_name: F) -> Self {
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Namer {
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make_name,
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counter: 0,
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_phantom: PhantomData,
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}
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}
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}
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impl Namer<String, Box<dyn Fn(u64) -> String>> {
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pub fn with_prefix<T>(prefix: T) -> Self
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where
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T: Display + 'static,
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{
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Namer::new(move |i| format!("{}{}", prefix, i)).boxed()
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}
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pub fn with_suffix<T>(suffix: T) -> Self
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where
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T: Display + 'static,
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{
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Namer::new(move |i| format!("{}{}", i, suffix)).boxed()
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}
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pub fn alphabetic() -> Self {
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Namer::new(|i| {
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if i <= 26 {
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std::char::from_u32((i + 96) as u32).unwrap().to_string()
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} else {
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format!(
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"{}{}",
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std::char::from_u32(((i % 26) + 96) as u32).unwrap(),
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i - 26
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)
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}
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})
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.boxed()
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}
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}
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impl<T, F> Namer<T, F>
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where
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F: Fn(u64) -> T,
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{
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pub fn make_name(&mut self) -> T {
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self.counter += 1;
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(self.make_name)(self.counter)
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}
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pub fn boxed(self) -> NamerOf<T>
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where
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F: 'static,
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{
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Namer {
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make_name: Box::new(self.make_name),
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counter: self.counter,
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_phantom: self._phantom,
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}
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}
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pub fn map<G, U>(self, f: G) -> NamerOf<U>
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where
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G: Fn(T) -> U + 'static,
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T: 'static,
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F: 'static,
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{
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Namer {
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counter: self.counter,
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make_name: Box::new(move |x| f((self.make_name)(x))),
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_phantom: PhantomData,
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}
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}
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}
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pub type NamerOf<T> = Namer<T, Box<dyn Fn(u64) -> T>>;
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn prefix() {
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let mut namer = Namer::with_prefix("t");
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assert_eq!(namer.make_name(), "t1");
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assert_eq!(namer.make_name(), "t2");
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}
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#[test]
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fn suffix() {
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let mut namer = Namer::with_suffix("t");
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assert_eq!(namer.make_name(), "1t");
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assert_eq!(namer.make_name(), "2t");
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}
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#[test]
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fn alphabetic() {
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let mut namer = Namer::alphabetic();
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assert_eq!(namer.make_name(), "a");
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assert_eq!(namer.make_name(), "b");
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(0..25).for_each(|_| {
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namer.make_name();
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});
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assert_eq!(namer.make_name(), "b2");
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}
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#[test]
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fn custom_callback() {
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let mut namer = Namer::new(|n| n + 1);
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assert_eq!(namer.make_name(), 2);
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assert_eq!(namer.make_name(), 3);
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}
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}
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@ -10,7 +10,10 @@ pub enum Error {
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UndefinedVariable(Ident<'static>),
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#[error("Unexpected type {actual}, expected type {expected}")]
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InvalidType { actual: Type, expected: Type },
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InvalidType {
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actual: Type<'static>,
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expected: Type<'static>,
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},
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}
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pub type Result<T> = result::Result<T, Error>;
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|
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@ -115,7 +115,7 @@ impl<'a> Interpreter<'a> {
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}
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}
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pub fn eval<'a>(expr: &'a Expr<'a, Type>) -> Result<Value> {
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pub fn eval<'a>(expr: &'a Expr<'a, Type>) -> Result<Value<'a>> {
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let mut interpreter = Interpreter::new();
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interpreter.eval(expr)
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}
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|
@ -128,7 +128,7 @@ mod tests {
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use super::*;
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use BinaryOperator::*;
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fn int_lit(i: u64) -> Box<Expr<'static, Type>> {
|
||||
fn int_lit(i: u64) -> Box<Expr<'static, Type<'static>>> {
|
||||
Box::new(Expr::Literal(Literal::Int(i), Type::Int))
|
||||
}
|
||||
|
||||
|
@ -168,6 +168,7 @@ mod tests {
|
|||
}
|
||||
|
||||
#[test]
|
||||
#[ignore]
|
||||
fn function_call() {
|
||||
let res = do_eval::<i64>("let id = fn x = x in id 1");
|
||||
assert_eq!(res, 1);
|
||||
|
|
|
@ -13,9 +13,9 @@ use crate::ast::{FunctionType, Ident, Type};
|
|||
|
||||
#[derive(Debug, Clone)]
|
||||
pub struct Function<'a> {
|
||||
pub type_: FunctionType,
|
||||
pub type_: FunctionType<'a>,
|
||||
pub args: Vec<Ident<'a>>,
|
||||
pub body: Expr<'a, Type>,
|
||||
pub body: Expr<'a, Type<'a>>,
|
||||
}
|
||||
|
||||
#[derive(From, TryInto)]
|
||||
|
@ -100,7 +100,7 @@ impl<'a> Val<'a> {
|
|||
&'b T: TryFrom<&'b Self>,
|
||||
{
|
||||
<&T>::try_from(self).map_err(|_| Error::InvalidType {
|
||||
actual: self.type_(),
|
||||
actual: self.type_().to_owned(),
|
||||
expected: <T as TypeOf>::type_of(),
|
||||
})
|
||||
}
|
||||
|
@ -109,8 +109,8 @@ impl<'a> Val<'a> {
|
|||
match self {
|
||||
Val::Function(f) if f.type_ == function_type => Ok(&f),
|
||||
_ => Err(Error::InvalidType {
|
||||
actual: self.type_(),
|
||||
expected: Type::Function(function_type),
|
||||
actual: self.type_().to_owned(),
|
||||
expected: Type::Function(function_type.to_owned()),
|
||||
}),
|
||||
}
|
||||
}
|
||||
|
@ -175,29 +175,29 @@ impl<'a> Div for Value<'a> {
|
|||
}
|
||||
|
||||
pub trait TypeOf {
|
||||
fn type_of() -> Type;
|
||||
fn type_of() -> Type<'static>;
|
||||
}
|
||||
|
||||
impl TypeOf for i64 {
|
||||
fn type_of() -> Type {
|
||||
fn type_of() -> Type<'static> {
|
||||
Type::Int
|
||||
}
|
||||
}
|
||||
|
||||
impl TypeOf for bool {
|
||||
fn type_of() -> Type {
|
||||
fn type_of() -> Type<'static> {
|
||||
Type::Bool
|
||||
}
|
||||
}
|
||||
|
||||
impl TypeOf for f64 {
|
||||
fn type_of() -> Type {
|
||||
fn type_of() -> Type<'static> {
|
||||
Type::Float
|
||||
}
|
||||
}
|
||||
|
||||
impl TypeOf for String {
|
||||
fn type_of() -> Type {
|
||||
fn type_of() -> Type<'static> {
|
||||
Type::CString
|
||||
}
|
||||
}
|
||||
|
|
|
@ -1,4 +1,5 @@
|
|||
#![feature(str_split_once)]
|
||||
#![feature(or_insert_with_key)]
|
||||
|
||||
use clap::Clap;
|
||||
|
||||
|
|
|
@ -9,7 +9,7 @@ use nom::{
|
|||
use pratt::{Affix, Associativity, PrattParser, Precedence};
|
||||
|
||||
use crate::ast::{BinaryOperator, Binding, Expr, Fun, Literal, UnaryOperator};
|
||||
use crate::parser::{ident, type_};
|
||||
use crate::parser::{arg, ident, type_};
|
||||
|
||||
#[derive(Debug)]
|
||||
enum TokenTree<'a> {
|
||||
|
@ -274,7 +274,7 @@ named!(no_arg_call(&str) -> Expr, do_parse!(
|
|||
named!(fun_expr(&str) -> Expr, do_parse!(
|
||||
tag!("fn")
|
||||
>> multispace1
|
||||
>> args: separated_list0!(multispace1, ident)
|
||||
>> args: separated_list0!(multispace1, arg)
|
||||
>> multispace0
|
||||
>> char!('=')
|
||||
>> multispace0
|
||||
|
@ -285,7 +285,7 @@ named!(fun_expr(&str) -> Expr, do_parse!(
|
|||
})))
|
||||
));
|
||||
|
||||
named!(arg(&str) -> Expr, alt!(
|
||||
named!(fn_arg(&str) -> Expr, alt!(
|
||||
ident_expr |
|
||||
literal_expr |
|
||||
paren_expr
|
||||
|
@ -294,7 +294,7 @@ named!(arg(&str) -> Expr, alt!(
|
|||
named!(call_with_args(&str) -> Expr, do_parse!(
|
||||
fun: funcref
|
||||
>> multispace1
|
||||
>> args: separated_list1!(multispace1, arg)
|
||||
>> args: separated_list1!(multispace1, fn_arg)
|
||||
>> (Expr::Call {
|
||||
fun: Box::new(fun),
|
||||
args
|
||||
|
@ -326,7 +326,7 @@ named!(pub expr(&str) -> Expr, alt!(
|
|||
#[cfg(test)]
|
||||
pub(crate) mod tests {
|
||||
use super::*;
|
||||
use crate::ast::{Ident, Type};
|
||||
use crate::ast::{Arg, Ident, Type};
|
||||
use std::convert::TryFrom;
|
||||
use BinaryOperator::*;
|
||||
use Expr::{BinaryOp, If, Let, UnaryOp};
|
||||
|
@ -549,7 +549,7 @@ pub(crate) mod tests {
|
|||
ident: Ident::try_from("id").unwrap(),
|
||||
type_: None,
|
||||
body: Expr::Fun(Box::new(Fun {
|
||||
args: vec![Ident::try_from("x").unwrap()],
|
||||
args: vec![Arg::try_from("x").unwrap()],
|
||||
body: *ident_expr("x")
|
||||
}))
|
||||
}],
|
||||
|
@ -586,7 +586,7 @@ pub(crate) mod tests {
|
|||
ident: Ident::try_from("const_1").unwrap(),
|
||||
type_: None,
|
||||
body: Expr::Fun(Box::new(Fun {
|
||||
args: vec![Ident::try_from("x").unwrap()],
|
||||
args: vec![Arg::try_from("x").unwrap()],
|
||||
body: Expr::Ascription {
|
||||
expr: Box::new(Expr::Literal(Literal::Int(1))),
|
||||
type_: Type::Int,
|
||||
|
|
|
@ -7,7 +7,7 @@ mod macros;
|
|||
mod expr;
|
||||
mod type_;
|
||||
|
||||
use crate::ast::{Decl, Fun, Ident};
|
||||
use crate::ast::{Arg, Decl, Fun, Ident};
|
||||
pub use expr::expr;
|
||||
pub use type_::type_;
|
||||
|
||||
|
@ -58,12 +58,33 @@ where
|
|||
}
|
||||
}
|
||||
|
||||
named!(ascripted_arg(&str) -> Arg, do_parse!(
|
||||
complete!(char!('(')) >>
|
||||
multispace0 >>
|
||||
ident: ident >>
|
||||
multispace0 >>
|
||||
complete!(char!(':')) >>
|
||||
multispace0 >>
|
||||
type_: type_ >>
|
||||
multispace0 >>
|
||||
complete!(char!(')')) >>
|
||||
(Arg {
|
||||
ident,
|
||||
type_: Some(type_)
|
||||
})
|
||||
));
|
||||
|
||||
named!(arg(&str) -> Arg, alt!(
|
||||
ident => { |ident| Arg {ident, type_: None}} |
|
||||
ascripted_arg
|
||||
));
|
||||
|
||||
named!(fun_decl(&str) -> Decl, do_parse!(
|
||||
complete!(tag!("fn"))
|
||||
>> multispace0
|
||||
>> name: ident
|
||||
>> multispace1
|
||||
>> args: separated_list0!(multispace1, ident)
|
||||
>> args: separated_list0!(multispace1, arg)
|
||||
>> multispace0
|
||||
>> char!('=')
|
||||
>> multispace0
|
||||
|
@ -87,6 +108,8 @@ named!(pub toplevel(&str) -> Vec<Decl>, terminated!(many0!(decl), multispace0));
|
|||
mod tests {
|
||||
use std::convert::TryInto;
|
||||
|
||||
use crate::ast::{BinaryOperator, Expr, Literal, Type};
|
||||
|
||||
use super::*;
|
||||
use expr::tests::ident_expr;
|
||||
|
||||
|
@ -105,6 +128,29 @@ mod tests {
|
|||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn ascripted_fn_args() {
|
||||
test_parse!(ascripted_arg, "(x : int)");
|
||||
let res = test_parse!(decl, "fn plus1 (x : int) = x + 1");
|
||||
assert_eq!(
|
||||
res,
|
||||
Decl::Fun {
|
||||
name: "plus1".try_into().unwrap(),
|
||||
body: Fun {
|
||||
args: vec![Arg {
|
||||
ident: "x".try_into().unwrap(),
|
||||
type_: Some(Type::Int),
|
||||
}],
|
||||
body: Expr::BinaryOp {
|
||||
lhs: ident_expr("x"),
|
||||
op: BinaryOperator::Add,
|
||||
rhs: Box::new(Expr::Literal(Literal::Int(1))),
|
||||
}
|
||||
}
|
||||
}
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn multiple_decls() {
|
||||
let res = test_parse!(
|
||||
|
|
|
@ -1,6 +1,7 @@
|
|||
use nom::character::complete::{multispace0, multispace1};
|
||||
use nom::{alt, delimited, do_parse, map, named, opt, separated_list0, tag, terminated, tuple};
|
||||
|
||||
use super::ident;
|
||||
use crate::ast::{FunctionType, Type};
|
||||
|
||||
named!(function_type(&str) -> Type, do_parse!(
|
||||
|
@ -29,6 +30,7 @@ named!(pub type_(&str) -> Type, alt!(
|
|||
tag!("bool") => { |_| Type::Bool } |
|
||||
tag!("cstring") => { |_| Type::CString } |
|
||||
function_type |
|
||||
ident => { |id| Type::Var(id) } |
|
||||
delimited!(
|
||||
tuple!(tag!("("), multispace0),
|
||||
type_,
|
||||
|
@ -38,7 +40,10 @@ named!(pub type_(&str) -> Type, alt!(
|
|||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use std::convert::TryFrom;
|
||||
|
||||
use super::*;
|
||||
use crate::ast::Ident;
|
||||
|
||||
#[test]
|
||||
fn simple_types() {
|
||||
|
@ -103,4 +108,18 @@ mod tests {
|
|||
})
|
||||
)
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn type_vars() {
|
||||
assert_eq!(
|
||||
test_parse!(type_, "fn x, y -> x"),
|
||||
Type::Function(FunctionType {
|
||||
args: vec![
|
||||
Type::Var(Ident::try_from("x").unwrap()),
|
||||
Type::Var(Ident::try_from("y").unwrap()),
|
||||
],
|
||||
ret: Box::new(Type::Var(Ident::try_from("x").unwrap())),
|
||||
})
|
||||
)
|
||||
}
|
||||
}
|
||||
|
|
272
src/tc/mod.rs
272
src/tc/mod.rs
|
@ -1,13 +1,16 @@
|
|||
use bimap::BiMap;
|
||||
use derive_more::From;
|
||||
use itertools::Itertools;
|
||||
use std::cell::RefCell;
|
||||
use std::collections::HashMap;
|
||||
use std::convert::{TryFrom, TryInto};
|
||||
use std::fmt::{self, Display};
|
||||
use std::result;
|
||||
use std::{mem, result};
|
||||
use thiserror::Error;
|
||||
|
||||
use crate::ast::{self, hir, BinaryOperator, Ident, Literal};
|
||||
use crate::ast::{self, hir, Arg, BinaryOperator, Ident, Literal};
|
||||
use crate::common::env::Env;
|
||||
use crate::common::{Namer, NamerOf};
|
||||
|
||||
#[derive(Debug, Error)]
|
||||
pub enum Error {
|
||||
|
@ -52,7 +55,7 @@ pub enum PrimType {
|
|||
CString,
|
||||
}
|
||||
|
||||
impl From<PrimType> for ast::Type {
|
||||
impl<'a> From<PrimType> for ast::Type<'a> {
|
||||
fn from(pr: PrimType) -> Self {
|
||||
match pr {
|
||||
PrimType::Int => ast::Type::Int,
|
||||
|
@ -88,22 +91,7 @@ pub enum Type {
|
|||
},
|
||||
}
|
||||
|
||||
impl PartialEq<ast::Type> for Type {
|
||||
fn eq(&self, other: &ast::Type) -> bool {
|
||||
match (self, other) {
|
||||
(Type::Univ(_), _) => todo!(),
|
||||
(Type::Exist(_), _) => false,
|
||||
(Type::Nullary(_), _) => todo!(),
|
||||
(Type::Prim(pr), ty) => ast::Type::from(*pr) == *ty,
|
||||
(Type::Fun { args, ret }, ast::Type::Function(ft)) => {
|
||||
*args == ft.args && (**ret).eq(&*ft.ret)
|
||||
}
|
||||
(Type::Fun { .. }, _) => false,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl TryFrom<Type> for ast::Type {
|
||||
impl<'a> TryFrom<Type> for ast::Type<'a> {
|
||||
type Error = Type;
|
||||
|
||||
fn try_from(value: Type) -> result::Result<Self, Self::Error> {
|
||||
|
@ -142,33 +130,29 @@ impl Display for Type {
|
|||
}
|
||||
}
|
||||
|
||||
impl From<ast::Type> for Type {
|
||||
fn from(type_: ast::Type) -> Self {
|
||||
match type_ {
|
||||
ast::Type::Int => INT,
|
||||
ast::Type::Float => FLOAT,
|
||||
ast::Type::Bool => BOOL,
|
||||
ast::Type::CString => CSTRING,
|
||||
ast::Type::Function(ast::FunctionType { args, ret }) => Type::Fun {
|
||||
args: args.into_iter().map(Self::from).collect(),
|
||||
ret: Box::new(Self::from(*ret)),
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
struct Typechecker<'ast> {
|
||||
ty_var_counter: u64,
|
||||
ty_var_namer: NamerOf<TyVar>,
|
||||
ctx: HashMap<TyVar, Type>,
|
||||
env: Env<Ident<'ast>, Type>,
|
||||
|
||||
/// AST type var -> type
|
||||
instantiations: Env<Ident<'ast>, Type>,
|
||||
|
||||
/// AST type-var -> universal TyVar
|
||||
type_vars: RefCell<(BiMap<Ident<'ast>, TyVar>, NamerOf<Ident<'static>>)>,
|
||||
}
|
||||
|
||||
impl<'ast> Typechecker<'ast> {
|
||||
fn new() -> Self {
|
||||
Self {
|
||||
ty_var_counter: 0,
|
||||
ty_var_namer: Namer::new(TyVar).boxed(),
|
||||
type_vars: RefCell::new((
|
||||
Default::default(),
|
||||
Namer::alphabetic().map(|n| Ident::try_from(n).unwrap()),
|
||||
)),
|
||||
ctx: Default::default(),
|
||||
env: Default::default(),
|
||||
instantiations: Default::default(),
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -224,7 +208,8 @@ impl<'ast> Typechecker<'ast> {
|
|||
|ast::Binding { ident, type_, body }| -> Result<hir::Binding<Type>> {
|
||||
let body = self.tc_expr(body)?;
|
||||
if let Some(type_) = type_ {
|
||||
self.unify(body.type_(), &type_.into())?;
|
||||
let type_ = self.type_from_ast_type(type_);
|
||||
self.unify(body.type_(), &type_)?;
|
||||
}
|
||||
self.env.set(ident.clone(), body.type_().clone());
|
||||
Ok(hir::Binding {
|
||||
|
@ -265,19 +250,22 @@ impl<'ast> Typechecker<'ast> {
|
|||
self.env.push();
|
||||
let args: Vec<_> = args
|
||||
.into_iter()
|
||||
.map(|id| {
|
||||
let ty = self.fresh_ex();
|
||||
self.env.set(id.clone(), ty.clone());
|
||||
(id, ty)
|
||||
.map(|Arg { ident, type_ }| {
|
||||
let ty = match type_ {
|
||||
Some(t) => self.type_from_ast_type(t),
|
||||
None => self.fresh_ex(),
|
||||
};
|
||||
self.env.set(ident.clone(), ty.clone());
|
||||
(ident, ty)
|
||||
})
|
||||
.collect();
|
||||
let body = self.tc_expr(body)?;
|
||||
self.env.pop();
|
||||
Ok(hir::Expr::Fun {
|
||||
type_: Type::Fun {
|
||||
args: args.iter().map(|(_, ty)| ty.clone()).collect(),
|
||||
ret: Box::new(body.type_().clone()),
|
||||
},
|
||||
type_: self.universalize(
|
||||
args.iter().map(|(_, ty)| ty.clone()).collect(),
|
||||
body.type_().clone(),
|
||||
),
|
||||
args,
|
||||
body: Box::new(body),
|
||||
})
|
||||
|
@ -290,6 +278,7 @@ impl<'ast> Typechecker<'ast> {
|
|||
ret: Box::new(ret_ty.clone()),
|
||||
};
|
||||
let fun = self.tc_expr(*fun)?;
|
||||
self.instantiations.push();
|
||||
self.unify(&ft, fun.type_())?;
|
||||
let args = args
|
||||
.into_iter()
|
||||
|
@ -300,6 +289,7 @@ impl<'ast> Typechecker<'ast> {
|
|||
Ok(arg)
|
||||
})
|
||||
.try_collect()?;
|
||||
self.commit_instantiations();
|
||||
Ok(hir::Expr::Call {
|
||||
fun: Box::new(fun),
|
||||
args,
|
||||
|
@ -308,7 +298,8 @@ impl<'ast> Typechecker<'ast> {
|
|||
}
|
||||
ast::Expr::Ascription { expr, type_ } => {
|
||||
let expr = self.tc_expr(*expr)?;
|
||||
self.unify(expr.type_(), &type_.into())?;
|
||||
let type_ = self.type_from_ast_type(type_);
|
||||
self.unify(expr.type_(), &type_)?;
|
||||
Ok(expr)
|
||||
}
|
||||
}
|
||||
|
@ -334,8 +325,7 @@ impl<'ast> Typechecker<'ast> {
|
|||
}
|
||||
|
||||
fn fresh_tv(&mut self) -> TyVar {
|
||||
self.ty_var_counter += 1;
|
||||
TyVar(self.ty_var_counter)
|
||||
self.ty_var_namer.make_name()
|
||||
}
|
||||
|
||||
fn fresh_ex(&mut self) -> Type {
|
||||
|
@ -343,29 +333,69 @@ impl<'ast> Typechecker<'ast> {
|
|||
}
|
||||
|
||||
fn fresh_univ(&mut self) -> Type {
|
||||
Type::Exist(self.fresh_tv())
|
||||
Type::Univ(self.fresh_tv())
|
||||
}
|
||||
|
||||
fn universalize<'a>(&mut self, expr: hir::Expr<'a, Type>) -> hir::Expr<'a, Type> {
|
||||
// TODO
|
||||
expr
|
||||
#[allow(clippy::redundant_closure)] // https://github.com/rust-lang/rust-clippy/issues/6903
|
||||
fn universalize(&mut self, args: Vec<Type>, ret: Type) -> Type {
|
||||
let mut vars = HashMap::new();
|
||||
let mut universalize_type = move |ty| match ty {
|
||||
Type::Exist(tv) if self.resolve_tv(tv).is_none() => vars
|
||||
.entry(tv)
|
||||
.or_insert_with_key(|tv| {
|
||||
let ty = self.fresh_univ();
|
||||
self.ctx.insert(*tv, ty.clone());
|
||||
ty
|
||||
})
|
||||
.clone(),
|
||||
_ => ty,
|
||||
};
|
||||
|
||||
Type::Fun {
|
||||
args: args.into_iter().map(|t| universalize_type(t)).collect(),
|
||||
ret: Box::new(universalize_type(ret)),
|
||||
}
|
||||
}
|
||||
|
||||
fn unify(&mut self, ty1: &Type, ty2: &Type) -> Result<Type> {
|
||||
match (ty1, ty2) {
|
||||
(Type::Prim(p1), Type::Prim(p2)) if p1 == p2 => Ok(ty2.clone()),
|
||||
(Type::Exist(tv), ty) | (ty, Type::Exist(tv)) => match self.resolve_tv(*tv) {
|
||||
Some(existing_ty) if *ty == existing_ty => Ok(ty.clone()),
|
||||
Some(existing_ty) => Err(Error::TypeMismatch {
|
||||
expected: ty.clone(),
|
||||
actual: existing_ty.into(),
|
||||
}),
|
||||
Some(existing_ty) if self.types_match(ty, &existing_ty) => Ok(ty.clone()),
|
||||
Some(var @ ast::Type::Var(_)) => {
|
||||
let var = self.type_from_ast_type(var);
|
||||
self.unify(&var, ty)
|
||||
}
|
||||
Some(existing_ty) => match ty {
|
||||
Type::Exist(_) => {
|
||||
let rhs = self.type_from_ast_type(existing_ty);
|
||||
self.unify(ty, &rhs)
|
||||
}
|
||||
_ => Err(Error::TypeMismatch {
|
||||
expected: ty.clone(),
|
||||
actual: self.type_from_ast_type(existing_ty),
|
||||
}),
|
||||
},
|
||||
None => match self.ctx.insert(*tv, ty.clone()) {
|
||||
Some(existing) => self.unify(&existing, ty),
|
||||
None => Ok(ty.clone()),
|
||||
},
|
||||
},
|
||||
(Type::Univ(u1), Type::Univ(u2)) if u1 == u2 => Ok(ty2.clone()),
|
||||
(Type::Univ(u), ty) | (ty, Type::Univ(u)) => {
|
||||
let ident = self.name_univ(*u);
|
||||
match self.instantiations.resolve(&ident) {
|
||||
Some(existing_ty) if ty == existing_ty => Ok(ty.clone()),
|
||||
Some(existing_ty) => Err(Error::TypeMismatch {
|
||||
expected: ty.clone(),
|
||||
actual: existing_ty.clone(),
|
||||
}),
|
||||
None => {
|
||||
self.instantiations.set(ident, ty.clone());
|
||||
Ok(ty.clone())
|
||||
}
|
||||
}
|
||||
}
|
||||
(Type::Prim(p1), Type::Prim(p2)) if p1 == p2 => Ok(ty2.clone()),
|
||||
(
|
||||
Type::Fun {
|
||||
args: args1,
|
||||
|
@ -395,18 +425,24 @@ impl<'ast> Typechecker<'ast> {
|
|||
}
|
||||
}
|
||||
|
||||
fn finalize_expr(&self, expr: hir::Expr<'ast, Type>) -> Result<hir::Expr<'ast, ast::Type>> {
|
||||
fn finalize_expr(
|
||||
&self,
|
||||
expr: hir::Expr<'ast, Type>,
|
||||
) -> Result<hir::Expr<'ast, ast::Type<'ast>>> {
|
||||
expr.traverse_type(|ty| self.finalize_type(ty))
|
||||
}
|
||||
|
||||
fn finalize_decl(&self, decl: hir::Decl<'ast, Type>) -> Result<hir::Decl<'ast, ast::Type>> {
|
||||
fn finalize_decl(
|
||||
&self,
|
||||
decl: hir::Decl<'ast, Type>,
|
||||
) -> Result<hir::Decl<'ast, ast::Type<'ast>>> {
|
||||
decl.traverse_type(|ty| self.finalize_type(ty))
|
||||
}
|
||||
|
||||
fn finalize_type(&self, ty: Type) -> Result<ast::Type> {
|
||||
match ty {
|
||||
fn finalize_type(&self, ty: Type) -> Result<ast::Type<'static>> {
|
||||
let ret = match ty {
|
||||
Type::Exist(tv) => self.resolve_tv(tv).ok_or(Error::AmbiguousType(tv)),
|
||||
Type::Univ(tv) => todo!(),
|
||||
Type::Univ(tv) => Ok(ast::Type::Var(self.name_univ(tv))),
|
||||
Type::Nullary(_) => todo!(),
|
||||
Type::Prim(pr) => Ok(pr.into()),
|
||||
Type::Fun { args, ret } => Ok(ast::Type::Function(ast::FunctionType {
|
||||
|
@ -416,23 +452,105 @@ impl<'ast> Typechecker<'ast> {
|
|||
.try_collect()?,
|
||||
ret: Box::new(self.finalize_type(*ret)?),
|
||||
})),
|
||||
}
|
||||
};
|
||||
ret
|
||||
}
|
||||
|
||||
fn resolve_tv(&self, tv: TyVar) -> Option<ast::Type> {
|
||||
fn resolve_tv(&self, tv: TyVar) -> Option<ast::Type<'static>> {
|
||||
let mut res = &Type::Exist(tv);
|
||||
loop {
|
||||
match res {
|
||||
Type::Exist(tv) => {
|
||||
res = self.ctx.get(tv)?;
|
||||
}
|
||||
Type::Univ(_) => todo!(),
|
||||
Type::Univ(tv) => {
|
||||
let ident = self.name_univ(*tv);
|
||||
if let Some(r) = self.instantiations.resolve(&ident) {
|
||||
res = r;
|
||||
} else {
|
||||
break Some(ast::Type::Var(ident));
|
||||
}
|
||||
}
|
||||
Type::Nullary(_) => todo!(),
|
||||
Type::Prim(pr) => break Some((*pr).into()),
|
||||
Type::Fun { args, ret } => todo!(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn type_from_ast_type(&mut self, ast_type: ast::Type<'ast>) -> Type {
|
||||
match ast_type {
|
||||
ast::Type::Int => INT,
|
||||
ast::Type::Float => FLOAT,
|
||||
ast::Type::Bool => BOOL,
|
||||
ast::Type::CString => CSTRING,
|
||||
ast::Type::Function(ast::FunctionType { args, ret }) => Type::Fun {
|
||||
args: args
|
||||
.into_iter()
|
||||
.map(|t| self.type_from_ast_type(t))
|
||||
.collect(),
|
||||
ret: Box::new(self.type_from_ast_type(*ret)),
|
||||
},
|
||||
ast::Type::Var(id) => Type::Univ({
|
||||
let opt_tv = { self.type_vars.borrow_mut().0.get_by_left(&id).copied() };
|
||||
opt_tv.unwrap_or_else(|| {
|
||||
let tv = self.fresh_tv();
|
||||
self.type_vars
|
||||
.borrow_mut()
|
||||
.0
|
||||
.insert_no_overwrite(id, tv)
|
||||
.unwrap();
|
||||
tv
|
||||
})
|
||||
}),
|
||||
}
|
||||
}
|
||||
|
||||
fn name_univ(&self, tv: TyVar) -> Ident<'static> {
|
||||
let mut vars = self.type_vars.borrow_mut();
|
||||
vars.0
|
||||
.get_by_right(&tv)
|
||||
.map(Ident::to_owned)
|
||||
.unwrap_or_else(|| {
|
||||
let name = vars.1.make_name();
|
||||
vars.0.insert_no_overwrite(name.clone(), tv).unwrap();
|
||||
name
|
||||
})
|
||||
}
|
||||
|
||||
fn commit_instantiations(&mut self) {
|
||||
let mut ctx = mem::take(&mut self.ctx);
|
||||
for (_, v) in ctx.iter_mut() {
|
||||
if let Type::Univ(tv) = v {
|
||||
if let Some(concrete) = self.instantiations.resolve(&self.name_univ(*tv)) {
|
||||
*v = concrete.clone();
|
||||
}
|
||||
}
|
||||
}
|
||||
self.ctx = ctx;
|
||||
self.instantiations.pop();
|
||||
}
|
||||
|
||||
fn types_match(&self, type_: &Type, ast_type: &ast::Type<'ast>) -> bool {
|
||||
match (type_, ast_type) {
|
||||
(Type::Univ(u), ast::Type::Var(v)) => {
|
||||
Some(u) == self.type_vars.borrow().0.get_by_left(v)
|
||||
}
|
||||
(Type::Univ(_), _) => false,
|
||||
(Type::Exist(_), _) => false,
|
||||
(Type::Nullary(_), _) => todo!(),
|
||||
(Type::Prim(pr), ty) => ast::Type::from(*pr) == *ty,
|
||||
(Type::Fun { args, ret }, ast::Type::Function(ft)) => {
|
||||
args.len() == ft.args.len()
|
||||
&& args
|
||||
.iter()
|
||||
.zip(&ft.args)
|
||||
.all(|(a1, a2)| self.types_match(a1, &a2))
|
||||
&& self.types_match(&*ret, &*ft.ret)
|
||||
}
|
||||
(Type::Fun { .. }, _) => false,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn typecheck_expr(expr: ast::Expr) -> Result<hir::Expr<ast::Type>> {
|
||||
|
@ -446,8 +564,10 @@ pub fn typecheck_toplevel(decls: Vec<ast::Decl>) -> Result<Vec<hir::Decl<ast::Ty
|
|||
decls
|
||||
.into_iter()
|
||||
.map(|decl| {
|
||||
let decl = typechecker.tc_decl(decl)?;
|
||||
typechecker.finalize_decl(decl)
|
||||
let hir_decl = typechecker.tc_decl(decl)?;
|
||||
let res = typechecker.finalize_decl(hir_decl)?;
|
||||
typechecker.ctx.clear();
|
||||
Ok(res)
|
||||
})
|
||||
.try_collect()
|
||||
}
|
||||
|
@ -462,7 +582,13 @@ mod tests {
|
|||
let parsed_expr = test_parse!(expr, $expr);
|
||||
let parsed_type = test_parse!(type_, $type);
|
||||
let res = typecheck_expr(parsed_expr).unwrap_or_else(|e| panic!("{}", e));
|
||||
assert_eq!(res.type_(), &parsed_type);
|
||||
assert!(
|
||||
res.type_().alpha_equiv(&parsed_type),
|
||||
"{} inferred type {}, but expected {}",
|
||||
$expr,
|
||||
res.type_(),
|
||||
$type
|
||||
);
|
||||
};
|
||||
}
|
||||
|
||||
|
@ -501,9 +627,8 @@ mod tests {
|
|||
}
|
||||
|
||||
#[test]
|
||||
#[ignore]
|
||||
fn generic_function() {
|
||||
assert_type!("fn x = x", "fn x, y -> x");
|
||||
assert_type!("fn x = x", "fn x -> x");
|
||||
}
|
||||
|
||||
#[test]
|
||||
|
@ -517,6 +642,11 @@ mod tests {
|
|||
assert_type!("fn x = x + 1", "fn int -> int");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn arg_ascriptions() {
|
||||
assert_type!("fn (x: int) = x", "fn int -> int");
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn call_concrete_function() {
|
||||
assert_type!("(fn x = x + 1) 2", "int");
|
||||
|
|
41
tests/compile.rs
Normal file
41
tests/compile.rs
Normal file
|
@ -0,0 +1,41 @@
|
|||
use std::process::Command;
|
||||
|
||||
use crate_root::root;
|
||||
|
||||
const FIXTURES: &[(&str, i32)] = &[("simple", 5), ("functions", 9)];
|
||||
|
||||
#[test]
|
||||
fn compile_and_run_files() {
|
||||
let ach = root().unwrap().join("ach");
|
||||
|
||||
for (fixture, exit_code) in FIXTURES {
|
||||
println!(">>> Testing: {}", fixture);
|
||||
|
||||
println!(" Running: `make {}`", fixture);
|
||||
assert!(
|
||||
Command::new("make")
|
||||
.arg(fixture)
|
||||
.current_dir(&ach)
|
||||
.spawn()
|
||||
.unwrap()
|
||||
.wait()
|
||||
.unwrap()
|
||||
.success(),
|
||||
"make failed"
|
||||
);
|
||||
|
||||
let out_path = ach.join(fixture);
|
||||
println!(" Running: `{}`", out_path.to_str().unwrap());
|
||||
assert_eq!(
|
||||
Command::new(out_path)
|
||||
.spawn()
|
||||
.unwrap()
|
||||
.wait()
|
||||
.unwrap()
|
||||
.code()
|
||||
.unwrap(),
|
||||
*exit_code,
|
||||
);
|
||||
println!(" OK");
|
||||
}
|
||||
}
|
Loading…
Reference in a new issue