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Java: Address review comments.

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This commit is contained in:
Anders Schack-Mulligen
2022-08-26 11:45:01 +02:00
parent 92f2976399
commit 3e5155d1a1
1 changed files with 10 additions and 4 deletions
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14
java/ql/lib/semmle/code/java/dispatch/Unification.qll
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@@ -72,6 +72,8 @@ module MkUnification<unificationTarget/1 targetLeft, unificationTarget/1 targetR
or
failsUnification(t1.(Array).getComponentType(), t2.(Array).getComponentType())
or
// Can't unify an `extends` bound against a concrete type that doesn't
// descend from that upper bound:
exists(RefType upperbound, RefType other |
t1.(BoundedType).getAnUltimateUpperBoundType().getSourceDeclaration() = upperbound and
t2.(RefType).getSourceDeclaration() = other and
@@ -84,24 +86,28 @@ module MkUnification<unificationTarget/1 targetLeft, unificationTarget/1 targetR
not other.getASourceSupertype*() = upperbound
)
or
// Can't unify two `extends` bounds that don't intersect:
exists(RefType upperbound1, RefType upperbound2 |
t1.(BoundedType).getAnUltimateUpperBoundType() = upperbound1 and
t2.(BoundedType).getAnUltimateUpperBoundType() = upperbound2 and
notHaveIntersection(upperbound1, upperbound2)
)
or
// Can't unify `? super X` against `Y` or `_ extends Y` where `Y` isn't an
// ancestor of `X`:
exists(RefType lowerbound, RefType upperbound |
t1.(Wildcard).getLowerBoundType().(RefType).getSourceDeclaration() = lowerbound and
getUpperBound(t2).getSourceDeclaration() = upperbound and
not lowerbound instanceof BoundedType
getUpperBound(t2).getSourceDeclaration() = upperbound
or
t2.(Wildcard).getLowerBoundType().(RefType).getSourceDeclaration() = lowerbound and
getUpperBound(t1).getSourceDeclaration() = upperbound and
not lowerbound instanceof BoundedType
getUpperBound(t1).getSourceDeclaration() = upperbound
|
not lowerbound instanceof BoundedType and
not lowerbound.getASourceSupertype*() = upperbound
)
or
// Can't unify `? super T`, where `T` is a type variable `T extends S`,
// with a type that doesn't intersect with `S`:
exists(BoundedType lowerbound, RefType upperbound |
t1.(Wildcard).getLowerBoundType() = lowerbound and
getUpperBound(t2) = upperbound