Skip to content

Rust: Refactor PathTypeMention #20094

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 5 commits into from
Jul 21, 2025
+113 −86
Merged

Rust: Refactor PathTypeMention #20094

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
620d228
Rust: Factor out `getTypeMentionForTypeParameter`
paldepind Jul 18, 2025
0e8c137
Rust: Only include paths as type mentions when they're used as such
paldepind Jul 19, 2025
804ffdb
Rust: Split `PathTypeMention` into an alias and a non-alias subclass
paldepind Jul 19, 2025
27e5251
Rust: Add `resolveRootType` predicate instead of using `resolveType` …
paldepind Jul 19, 2025
441cefd
Rust: Accept test changes
paldepind Jul 21, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
197 changes: 113 additions & 84 deletions rust/ql/lib/codeql/rust/internal/TypeMention.qll
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -50,24 +50,70 @@ class SliceTypeReprMention extends TypeMention instanceof SliceTypeRepr {
}
}

class PathTypeMention extends TypeMention, Path {
TypeItemNode resolved;
/** Holds if `path` is used as a type mention during type inference. */
predicate relevantPathTypeMention(Path path) {
path =
[
any(PathTypeRepr r).getPath(),
any(StructExpr s).getPath().getQualifier*(),
any(CallExpr ce).getFunction().(PathExpr).getPath().getQualifier*(),
any(StructPat p).getPath(),
any(TupleStructPat p).getPath()
]
}

abstract class PathTypeMention extends TypeMention, Path {
PathTypeMention() { relevantPathTypeMention(this) }
}

class AliasPathTypeMention extends PathTypeMention {
TypeAlias resolved;
TypeMention rhs;

AliasPathTypeMention() {
resolved = resolvePath(this) and
rhs = resolved.getTypeRepr()
}

TypeItemNode getResolved() { result = resolved }

PathTypeMention() {
resolved = resolvePath(this)
/**
* Holds if this path resolved to a type alias with a rhs. that has the
* resulting type at `typePath`.
*/
pragma[nomagic]
override Type resolveTypeAt(TypePath typePath) {
result = rhs.resolveTypeAt(typePath) and
not result = pathGetTypeParameter(resolved, _)
or
resolved = resolvePath(this).(Variant).getEnum()
exists(TypeParameter tp, TypeMention arg, TypePath prefix, TypePath suffix, int i |
tp = rhs.resolveTypeAt(prefix) and
tp = pathGetTypeParameter(resolved, pragma[only_bind_into](i)) and
arg = this.getSegment().getGenericArgList().getTypeArg(pragma[only_bind_into](i)) and
result = arg.resolveTypeAt(suffix) and
typePath = prefix.append(suffix)
)
}
}

class NonAliasPathTypeMention extends PathTypeMention {
TypeItemNode resolved;

NonAliasPathTypeMention() {
resolved = [resolvePath(this), resolvePath(this).(Variant).getEnum().(TypeItemNode)] and
not exists(resolved.(TypeAlias).getTypeRepr())
}

TypeItemNode getResolved() { result = resolved }

/**
* Gets a type alias with the name `name` of the trait that this path resolves
* to, if any.
*/
pragma[nomagic]
private TypeAlias getResolvedTraitAlias(string name) {
exists(TraitItemNode trait |
trait = resolved and
result = trait.getAnAssocItem() and
name = result.getName().getText()
)
result = resolved.(TraitItemNode).getAnAssocItem() and
name = result.getName().getText()
}

pragma[nomagic]
Expand Down Expand Up @@ -115,92 +161,75 @@ class PathTypeMention extends TypeMention, Path {
// If a type argument is not given in the path, then we use the default for
// the type parameter if one exists for the type.
not exists(this.getPositionalTypeArgument0(i)) and
result = this.resolveType().getTypeParameterDefault(i) and
result = this.resolveRootType().getTypeParameterDefault(i) and
// Defaults only apply to type mentions in type annotations
this = any(PathTypeRepr ptp).getPath().getQualifier*()
}

/**
* Holds if this path resolved to a type alias with a rhs. that has the
* resulting type at `typePath`.
*/
/** Gets the type mention in this path for the type parameter `tp`, if any. */
pragma[nomagic]
private Type aliasResolveTypeAt(TypePath typePath) {
exists(TypeAlias alias, TypeMention rhs | alias = resolved and rhs = alias.getTypeRepr() |
result = rhs.resolveTypeAt(typePath) and
not result = pathGetTypeParameter(alias, _)
or
exists(TypeParameter tp, TypeMention arg, TypePath prefix, TypePath suffix, int i |
tp = rhs.resolveTypeAt(prefix) and
tp = pathGetTypeParameter(alias, pragma[only_bind_into](i)) and
arg = this.getSegment().getGenericArgList().getTypeArg(pragma[only_bind_into](i)) and
result = arg.resolveTypeAt(suffix) and
typePath = prefix.append(suffix)
)
private TypeMention getTypeMentionForTypeParameter(TypeParameter tp) {
exists(int i |
result = this.getPositionalTypeArgument(pragma[only_bind_into](i)) and
tp = this.resolveRootType().getTypeParameter(pragma[only_bind_into](i))
)
or
exists(TypeAlias alias |
result = this.getAnAssocTypeArgument(alias) and
tp = TAssociatedTypeTypeParameter(alias)
)
or
// If `path` is the trait of an `impl` block then any associated types
// defined in the `impl` block are type arguments to the trait.
//
// For instance, for a trait implementation like this
// ```rust
// impl MyTrait for MyType {
// ^^^^^^^ path
// type AssociatedType = i64
// ^^^ result
// // ...
// }
// ```
// the rhs. of the type alias is a type argument to the trait.
exists(ImplItemNode impl, AssociatedTypeTypeParameter param, TypeAlias alias, string name |
this = impl.getTraitPath() and
param.getTrait() = resolved and
name = param.getTypeAlias().getName().getText() and
alias = impl.getASuccessor(pragma[only_bind_into](name)) and
result = alias.getTypeRepr() and
tp =
TAssociatedTypeTypeParameter(resolved
.(TraitItemNode)
.getAssocItem(pragma[only_bind_into](name)))
)
}

override Type resolveTypeAt(TypePath typePath) {
result = this.aliasResolveTypeAt(typePath)
Type resolveRootType() {
result = TStruct(resolved)
or
typePath.isEmpty() and
(
result = TStruct(resolved)
or
result = TEnum(resolved)
or
exists(TraitItemNode trait | trait = resolved |
// If this is a `Self` path, then it resolves to the implicit `Self`
// type parameter, otherwise it is a trait bound.
if this = trait.getASelfPath()
then result = TSelfTypeParameter(trait)
else result = TTrait(trait)
)
or
result = TTypeParamTypeParameter(resolved)
or
result = TAssociatedTypeTypeParameter(resolved)
result = TEnum(resolved)
or
exists(TraitItemNode trait | trait = resolved |
// If this is a `Self` path, then it resolves to the implicit `Self`
// type parameter, otherwise it is a trait bound.
if this = trait.getASelfPath()
then result = TSelfTypeParameter(trait)
else result = TTrait(trait)
)
or
not exists(resolved.(TypeAlias).getTypeRepr()) and
exists(TypeParameter tp, TypeMention arg, TypePath suffix |
result = arg.resolveTypeAt(suffix) and
result = TTypeParamTypeParameter(resolved)
or
result = TAssociatedTypeTypeParameter(resolved)
}

override Type resolveTypeAt(TypePath typePath) {
typePath.isEmpty() and
result = this.resolveRootType()
or
exists(TypeParameter tp, TypePath suffix |
result = this.getTypeMentionForTypeParameter(tp).resolveTypeAt(suffix) and
typePath = TypePath::cons(tp, suffix)
|
exists(int i |
arg = this.getPositionalTypeArgument(pragma[only_bind_into](i)) and
tp = this.resolveType().getTypeParameter(pragma[only_bind_into](i))
)
or
exists(TypeAlias alias |
arg = this.getAnAssocTypeArgument(alias) and
tp = TAssociatedTypeTypeParameter(alias)
)
or
// If `path` is the trait of an `impl` block then any associated types
// defined in the `impl` block are type arguments to the trait.
//
// For instance, for a trait implementation like this
// ```rust
// impl MyTrait for MyType {
// ^^^^^^^ path
// type AssociatedType = i64
// ^^^ result
// // ...
// }
// ```
// the rhs. of the type alias is a type argument to the trait.
exists(ImplItemNode impl, AssociatedTypeTypeParameter param, TypeAlias alias, string name |
this = impl.getTraitPath() and
param.getTrait() = resolved and
name = param.getTypeAlias().getName().getText() and
alias = impl.getASuccessor(pragma[only_bind_into](name)) and
arg = alias.getTypeRepr() and
tp =
TAssociatedTypeTypeParameter(resolved
.(TraitItemNode)
.getAssocItem(pragma[only_bind_into](name)))
)
)
}
}
Expand Down
2 changes: 0 additions & 2 deletions rust/ql/test/query-tests/unusedentities/CONSISTENCY/TypeInferenceConsistency.expected
View file
Open in desktop

This file was deleted.

Loading
pFad - Phonifier reborn

Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.

Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.


Alternative Proxies:

Alternative Proxy

pFad Proxy

pFad v3 Proxy

pFad v4 Proxy