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Rust: Use ToIndex instead of FromIndex in ranked forex predicates

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`ToIndex` makes more sense, since we start the recursion from `0`.
This commit is contained in:
Tom Hvitved
2025-11-17 12:27:53 +01:00
parent c0ebc17bdc
commit 3419c00bc0
2 changed files with 16 additions and 16 deletions
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22
shared/typeinference/codeql/typeinference/internal/TypeInference.qll
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@@ -578,7 +578,7 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
}
pragma[nomagic]
private predicate satisfiesConcreteTypesFromIndex(
private predicate satisfiesConcreteTypesToIndex(
App app, TypeAbstraction abs, Constraint constraint, int i
) {
exists(Type t, TypePath path |
@@ -586,13 +586,13 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
if t = abs.getATypeParameter() then any() else app.getTypeAt(path) = t
) and
// Recurse unless we are at the first path
if i = 0 then any() else satisfiesConcreteTypesFromIndex(app, abs, constraint, i - 1)
if i = 0 then any() else satisfiesConcreteTypesToIndex(app, abs, constraint, i - 1)
}
/** Holds if all the concrete types in `constraint` also occur in `app`. */
pragma[nomagic]
private predicate satisfiesConcreteTypes(App app, TypeAbstraction abs, Constraint constraint) {
satisfiesConcreteTypesFromIndex(app, abs, constraint,
satisfiesConcreteTypesToIndex(app, abs, constraint,
max(int i | exists(getNthPath(constraint, i))))
}
@@ -620,7 +620,7 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
}
pragma[nomagic]
private predicate typeParametersEqualFromIndexBase(
private predicate typeParametersEqualToIndexBase(
App app, TypeAbstraction abs, Constraint constraint, TypeParameter tp, TypePath path
) {
path = getNthTypeParameterPath(constraint, tp, 0) and
@@ -630,15 +630,15 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
}
pragma[nomagic]
private predicate typeParametersEqualFromIndex(
private predicate typeParametersEqualToIndex(
App app, TypeAbstraction abs, Constraint constraint, TypeParameter tp, Type t, int i
) {
exists(TypePath path |
t = app.getTypeAt(path) and
if i = 0
then typeParametersEqualFromIndexBase(app, abs, constraint, tp, path)
then typeParametersEqualToIndexBase(app, abs, constraint, tp, path)
else (
typeParametersEqualFromIndex(app, abs, constraint, tp, t, i - 1) and
typeParametersEqualToIndex(app, abs, constraint, tp, t, i - 1) and
path = getNthTypeParameterPath(constraint, tp, i)
)
)
@@ -655,19 +655,19 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
exists(int n | n = max(int i | exists(getNthTypeParameterPath(constraint, tp, i))) |
// If the largest index is 0, then there are no equalities to check as
// the type parameter only occurs once.
if n = 0 then any() else typeParametersEqualFromIndex(app, abs, constraint, tp, _, n)
if n = 0 then any() else typeParametersEqualToIndex(app, abs, constraint, tp, _, n)
)
)
}
private predicate typeParametersHaveEqualInstantiationFromIndex(
private predicate typeParametersHaveEqualInstantiationToIndex(
App app, TypeAbstraction abs, Constraint constraint, int i
) {
exists(TypeParameter tp | tp = getNthTypeParameter(abs, i) |
typeParametersEqual(app, abs, constraint, tp) and
if i = 0
then any()
else typeParametersHaveEqualInstantiationFromIndex(app, abs, constraint, i - 1)
else typeParametersHaveEqualInstantiationToIndex(app, abs, constraint, i - 1)
)
}
@@ -697,7 +697,7 @@ module Make1<LocationSig Location, InputSig1<Location> Input1> {
not exists(getNthTypeParameter(abs, _))
or
exists(int n | n = max(int i | exists(getNthTypeParameter(abs, i))) |
typeParametersHaveEqualInstantiationFromIndex(app, abs, constraint, n)
typeParametersHaveEqualInstantiationToIndex(app, abs, constraint, n)
)
)
}