Rust: Adjustments to type inference

Author: paldepind

rust/ql/lib/codeql/rust/elements/internal/FieldExprImpl.qll

@@ -23,7 +23,7 @@ module Impl {
    */
   class FieldExpr extends Generated::FieldExpr {
     /** Gets the record field that this access references, if any. */
-    StructField getStructField() { result = TypeInference::resolveRecordFieldExpr(this) }
+    StructField getStructField() { result = TypeInference::resolveStructFieldExpr(this) }
 
     /** Gets the tuple field that this access references, if any. */
     TupleField getTupleField() { result = TypeInference::resolveTupleFieldExpr(this) }

rust/ql/lib/codeql/rust/elements/internal/StructImpl.qll

@@ -43,6 +43,6 @@ module Impl {
      * Empty structs are considered to use record fields.
      */
     pragma[nomagic]
-    predicate isRecord() { not this.isTuple() }
+    predicate isStruct() { not this.isTuple() }
   }
 }

rust/ql/lib/codeql/rust/elements/internal/VariantImpl.qll

@@ -38,12 +38,12 @@ module Impl {
     predicate isTuple() { this.getFieldList() instanceof TupleFieldList }
 
     /**
-     * Holds if this variant uses record fields.
+     * Holds if this variant uses struct fields.
      *
-     * Empty variants are considered to use record fields.
+     * Empty variants are considered to use struct fields.
      */
     pragma[nomagic]
-    predicate isRecord() { not this.isTuple() }
+    predicate isStruct() { not this.isTuple() }
 
     /** Gets the enum that this variant belongs to. */
     Enum getEnum() { this = result.getVariantList().getAVariant() }

rust/ql/lib/codeql/rust/internal/Type.qll

@@ -29,7 +29,7 @@ abstract class Type extends TType {
   pragma[nomagic]
   abstract Function getMethod(string name);
 
-  /** Gets the record field `name` belonging to this type, if any. */
+  /** Gets the struct field `name` belonging to this type, if any. */
   pragma[nomagic]
   abstract StructField getStructField(string name);
 

rust/ql/lib/codeql/rust/internal/TypeInference.qll

@@ -248,24 +248,24 @@ private TypeMention getExplicitTypeArgMention(Path path, TypeParam tp) {
 }
 
 /**
- * A matching configuration for resolving types of record expressions
+ * A matching configuration for resolving types of struct expressions
  * like `Foo { bar = baz }`.
  */
 private module StructExprMatchingInput implements MatchingInputSig {
   private newtype TPos =
     TFieldPos(string name) { exists(any(Declaration decl).getField(name)) } or
-    TRecordPos()
+    TStructPos()
 
   class DeclarationPosition extends TPos {
     string asFieldPos() { this = TFieldPos(result) }
 
-    predicate isRecordPos() { this = TRecordPos() }
+    predicate isStructPos() { this = TStructPos() }
 
     string toString() {
       result = this.asFieldPos()
       or
-      this.isRecordPos() and
-      result = "(record)"
+      this.isStructPos() and
+      result = "(struct)"
     }
   }
 
@@ -286,15 +286,15 @@ private module StructExprMatchingInput implements MatchingInputSig {
         result = tp.resolveTypeAt(path)
       )
       or
-      // type parameter of the record itself
-      dpos.isRecordPos() and
+      // type parameter of the struct itself
+      dpos.isStructPos() and
       result = this.getTypeParameter(_) and
       path = TypePath::singleton(result)
     }
   }
 
-  private class RecordStructDecl extends Declaration, Struct {
-    RecordStructDecl() { this.isRecord() }
+  private class StructDecl extends Declaration, Struct {
+    StructDecl() { this.isStruct() }
 
     override TypeParam getATypeParam() { result = this.getGenericParamList().getATypeParam() }
 
@@ -304,14 +304,14 @@ private module StructExprMatchingInput implements MatchingInputSig {
       result = super.getDeclaredType(dpos, path)
       or
       // type of the struct itself
-      dpos.isRecordPos() and
+      dpos.isStructPos() and
       path.isEmpty() and
       result = TStruct(this)
     }
   }
 
-  private class RecordVariantDecl extends Declaration, Variant {
-    RecordVariantDecl() { this.isRecord() }
+  private class StructVariantDecl extends Declaration, Variant {
+    StructVariantDecl() { this.isStruct() }
 
     Enum getEnum() { result.getVariantList().getAVariant() = this }
 
@@ -325,7 +325,7 @@ private module StructExprMatchingInput implements MatchingInputSig {
       result = super.getDeclaredType(dpos, path)
       or
       // type of the enum itself
-      dpos.isRecordPos() and
+      dpos.isStructPos() and
       path.isEmpty() and
       result = TEnum(this.getEnum())
     }
@@ -342,7 +342,7 @@ private module StructExprMatchingInput implements MatchingInputSig {
       result = this.getFieldExpr(apos.asFieldPos()).getExpr()
       or
       result = this and
-      apos.isRecordPos()
+      apos.isStructPos()
     }
 
     Type getInferredType(AccessPosition apos, TypePath path) {
@@ -360,8 +360,8 @@ private module StructExprMatchingInput implements MatchingInputSig {
 private module StructExprMatching = Matching<StructExprMatchingInput>;
 
 /**
- * Gets the type of `n` at `path`, where `n` is either a record expression or
- * a field expression of a record expression.
+ * Gets the type of `n` at `path`, where `n` is either a struct expression or
+ * a field expression of a struct expression.
  */
 pragma[nomagic]
 private Type inferStructExprType(AstNode n, TypePath path) {
@@ -777,7 +777,7 @@ private module FieldExprMatchingInput implements MatchingInputSig {
 
     Declaration getTarget() {
       // mutual recursion; resolving fields requires resolving types and vice versa
-      result = [resolveRecordFieldExpr(this).(AstNode), resolveTupleFieldExpr(this)]
+      result = [resolveStructFieldExpr(this).(AstNode), resolveTupleFieldExpr(this)]
     }
   }
 
@@ -921,10 +921,10 @@ private module Cached {
   }
 
   /**
-   * Gets the record field that the field expression `fe` resolves to, if any.
+   * Gets the struct field that the field expression `fe` resolves to, if any.
    */
   cached
-  StructField resolveRecordFieldExpr(FieldExpr fe) {
+  StructField resolveStructFieldExpr(FieldExpr fe) {
     exists(string name | result = getFieldExprLookupType(fe, name).getStructField(name))
   }
 

rust/ql/test/library-tests/type-inference/main.rs

@@ -255,8 +255,8 @@ mod type_parameter_bounds {
 
 mod function_trait_bounds {
     #[derive(Debug)]
-    struct MyThing<A> {
-        a: A,
+    struct MyThing<T> {
+        a: T,
     }
 
     #[derive(Debug)]
@@ -387,12 +387,12 @@ mod method_supertraits {
     #[derive(Debug)]
     struct S2;
 
-    trait MyTrait1<A> {
-        fn m1(self) -> A;
+    trait MyTrait1<Tr1> {
+        fn m1(self) -> Tr1;
     }
 
-    trait MyTrait2<A>: MyTrait1<A> {
-        fn m2(self) -> A
+    trait MyTrait2<Tr2>: MyTrait1<Tr2> {
+        fn m2(self) -> Tr2
         where
             Self: Sized,
         {
@@ -404,8 +404,8 @@ mod method_supertraits {
         }
     }
 
-    trait MyTrait3<A>: MyTrait2<MyThing<A>> {
-        fn m3(self) -> A
+    trait MyTrait3<Tr3>: MyTrait2<MyThing<Tr3>> {
+        fn m3(self) -> Tr3
         where
             Self: Sized,
         {