M-Labs/nac3
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fixed range check

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This commit is contained in:
pca006132 2021-07-23 17:22:05 +08:00
parent d140164a38
commit d7df93bef1
2 changed files with 113 additions and 31 deletions
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62
nac3core/src/typecheck/typedef/mod.rs
View File

@ -207,7 +207,6 @@ impl Unifier {
if !self.shape_match(*v1, *v2) {
continue;
}
self.unify(*v1, *v2)?;
range2.push(*v2);
}
}
@ -221,7 +220,7 @@ impl Unifier {
}
(TVar { meta: Generic, id, range, .. }, _) => {
self.occur_check(a, b)?;
self.check_var_range(*id, b, &range.borrow())?;
self.check_var_compatible(*id, b, &range.borrow())?;
self.set_a_to_b(a, b);
}
(TVar { meta: Sequence(map), id, range, .. }, TTuple { ty }) => {
@ -238,7 +237,7 @@ impl Unifier {
}
self.unify(*v, ty[ind as usize])?;
}
self.check_var_range(*id, b, &range.borrow())?;
self.check_var_compatible(*id, b, &range.borrow())?;
self.set_a_to_b(a, b);
}
(TVar { meta: Sequence(map), id, range, .. }, TList { ty }) => {
@ -246,7 +245,7 @@ impl Unifier {
for v in map.borrow().values() {
self.unify(*v, *ty)?;
}
self.check_var_range(*id, b, &range.borrow())?;
self.check_var_compatible(*id, b, &range.borrow())?;
self.set_a_to_b(a, b);
}
(TTuple { ty: ty1 }, TTuple { ty: ty2 }) => {
@ -275,7 +274,7 @@ impl Unifier {
return Err(format!("No such attribute {}", k));
}
}
self.check_var_range(*id, b, &range.borrow())?;
self.check_var_compatible(*id, b, &range.borrow())?;
self.set_a_to_b(a, b);
}
(TVar { meta: Record(map), id, range, .. }, TVirtual { ty }) => {
@ -288,14 +287,16 @@ impl Unifier {
return Err(format!("Cannot access field {} for virtual type", k));
}
self.unify(*v, *ty)?;
} else {
return Err(format!("No such attribute {}", k));
}
}
} else {
// require annotation...
return Err("Requires type annotation for virtual".to_string());
}
self.check_var_range(*id, b, &range.borrow())?;
self.unify(a, b)?;
self.check_var_compatible(*id, b, &range.borrow())?;
self.set_a_to_b(a, b);
}
(
TObj { obj_id: id1, params: params1, .. },
@ -457,24 +458,6 @@ impl Unifier {
}
}
fn check_var_range(&mut self, id: u32, b: Type, range: &[Type]) -> Result<(), String> {
let mut in_range = range.is_empty();
for t in range.iter() {
if self.shape_match(*t, b) {
self.unify(*t, b)?;
in_range = true;
}
}
if !in_range {
return Err(format!(
"Cannot unify {} with {} due to incompatible value range",
id,
self.get_ty(b).get_type_name()
));
}
Ok(())
}
fn set_a_to_b(&mut self, a: Type, b: Type) {
// unify a and b together, and set the value to b's value.
let table = &mut self.unification_table;
@ -665,13 +648,13 @@ impl Unifier {
Ok(())
}
pub fn shape_match(&mut self, a: Type, b: Type) -> bool {
fn shape_match(&mut self, a: Type, b: Type) -> bool {
use TypeEnum::*;
let a = self.get_ty(a);
let b = self.get_ty(b);
match (a.as_ref(), b.as_ref()) {
(TVar { .. }, _) => true,
(_, TVar { .. }) => true,
let x = self.get_ty(a);
let y = self.get_ty(b);
match (x.as_ref(), y.as_ref()) {
(TVar { id, range, .. }, _) => self.check_var_compatible(*id, b, &range.borrow()).is_ok(),
(_, TVar { id, range, .. }) => self.check_var_compatible(*id, a, &range.borrow()).is_ok(),
(TTuple { ty: ty1 }, TTuple { ty: ty2 }) => {
ty1.len() == ty2.len()
&& zip(ty1.iter(), ty2.iter()).all(|(a, b)| self.shape_match(*a, *b))
@ -683,4 +666,21 @@ impl Unifier {
_ => false,
}
}
fn check_var_compatible(&mut self, id: u32, b: Type, range: &[Type]) -> Result<(), String> {
let mut in_range = range.is_empty();
for t in range.iter() {
if self.shape_match(*t, b) {
in_range = true;
}
}
if !in_range {
return Err(format!(
"Cannot unify type variable {} with {} due to incompatible value range",
id,
self.get_ty(b).get_type_name()
));
}
Ok(())
}
}

82
nac3core/src/typecheck/typedef/test.rs
View File

@ -322,3 +322,85 @@ fn test_invalid_unification(
}
assert_eq!(env.unifier.unify(t1, t2), Err(errornous_pair.1.to_string()));
}
#[test]
fn test_virtual() {
let mut env = TestEnvironment::new();
let int = env.parse("int", &HashMap::new());
let fun = env.unifier.add_ty(TypeEnum::TFunc(FunSignature {
args: vec![],
ret: int,
vars: HashMap::new(),
}));
let bar = env.unifier.add_ty(TypeEnum::TObj {
obj_id: 5,
fields: [("f".to_string(), fun), ("a".to_string(), int)].iter().cloned().collect(),
params: HashMap::new(),
});
let v0 = env.unifier.get_fresh_var().0;
let v1 = env.unifier.get_fresh_var().0;
let a = env.unifier.add_ty(TypeEnum::TVirtual { ty: bar });
let b = env.unifier.add_ty(TypeEnum::TVirtual { ty: v0 });
let c = env.unifier.add_record([("f".to_string(), v1)].iter().cloned().collect());
env.unifier.unify(a, b).unwrap();
env.unifier.unify(b, c).unwrap();
assert!(env.unifier.eq(v1, fun));
let d = env.unifier.add_record([("a".to_string(), v1)].iter().cloned().collect());
assert_eq!(env.unifier.unify(b, d), Err("Cannot access field a for virtual type".to_string()));
let d = env.unifier.add_record([("b".to_string(), v1)].iter().cloned().collect());
assert_eq!(env.unifier.unify(b, d), Err("No such attribute b".to_string()));
}
#[test]
fn test_typevar_range() {
let mut env = TestEnvironment::new();
let int = env.parse("int", &HashMap::new());
let boolean = env.parse("bool", &HashMap::new());
let float = env.parse("float", &HashMap::new());
let int_list = env.parse("List[int]", &HashMap::new());
let float_list = env.parse("List[float]", &HashMap::new());
// unification between v and int
// where v in (int, bool)
let v = env.unifier.get_fresh_var_with_range(&[int, boolean]).0;
env.unifier.unify(int, v).unwrap();
// unification between v and List[int]
// where v in (int, bool)
let v = env.unifier.get_fresh_var_with_range(&[int, boolean]).0;
assert_eq!(
env.unifier.unify(int_list, v),
Err("Cannot unify type variable 3 with TList due to incompatible value range".to_string())
);
// unification between v and float
// where v in (int, bool)
let v = env.unifier.get_fresh_var_with_range(&[int, boolean]).0;
assert_eq!(
env.unifier.unify(float, v),
Err("Cannot unify type variable 4 with TObj due to incompatible value range".to_string())
);
let v1 = env.unifier.get_fresh_var_with_range(&[int, boolean]).0;
let v1_list = env.unifier.add_ty(TypeEnum::TList { ty: v1 });
let v = env.unifier.get_fresh_var_with_range(&[int, v1_list]).0;
// unification between v and int
// where v in (int, List[v1]), v1 in (int, bool)
env.unifier.unify(int, v).unwrap();
let v = env.unifier.get_fresh_var_with_range(&[int, v1_list]).0;
// unification between v and List[int]
// where v in (int, List[v1]), v1 in (int, bool)
env.unifier.unify(int_list, v).unwrap();
let v = env.unifier.get_fresh_var_with_range(&[int, v1_list]).0;
// unification between v and List[float]
// where v in (int, List[v1]), v1 in (int, bool)
assert_eq!(
env.unifier.unify(float_list, v),
Err("Cannot unify type variable 8 with TList due to incompatible value range".to_string())
);
}