scala3-compiler-bootstrapped/dotty.tools/dotty.tools.dotc/dotty.tools.dotc.core/Denotations

Denotations

dotty.tools.dotc.core.Denotations$

Denotations represent the meaning of symbols and named types. The following diagram shows how the principal types of denotations and their denoting entities relate to each other. Lines ending in a down-arrow v are member methods. The two methods shown in the diagram are "symbol" and "deref". Both methods are parameterized by the current context, and are effectively indexed by current period.

Lines ending in a horizontal line mean subtyping (right is a subtype of left).

Here's a short summary of the classes in this diagram.

NamedType A type consisting of a prefix type and a name, with fields prefix: Type name: Name It has two subtypes: TermRef and TypeRef Symbol A label for a definition or declaration in one compiler run ClassSymbol A symbol representing a class Denotation The meaning of a named type or symbol during a period MultiDenotation A denotation representing several overloaded members SingleDenotation A denotation representing a non-overloaded member or definition, with main fields symbol: Symbol info: Type UniqueRefDenotation A denotation referring to a single definition with some member type JointRefDenotation A denotation referring to a member that could resolve to several definitions SymDenotation A denotation representing a single definition with its original type, with main fields name: Name owner: Symbol flags: Flags privateWithin: Symbol annotations: List[Annotation] ClassDenotation A denotation representing a single class definition.

Attributes

Graph
Supertypes: class Object

trait Matchable

class Any
Self type: Denotations.type

Members list

Type members

Classlikes

Attributes

Supertypes: trait Serializable

trait Product

trait Equals

trait MultiPreDenotation

class PreDenotation

class Object

trait Matchable

class Any
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A denotation is the result of resolving a name (either simple identifier or select) during a given period.

Denotations can be combined with & and |. & is conjunction, | is disjunction.

& will create an overloaded denotation from two non-overloaded denotations if their signatures differ. Analogously | of two denotations with different signatures will give an empty denotation NoDenotation.

A denotation might refer to NoSymbol. This is the case if the denotation was produced from a disjunction of two denotations with different symbols and there was no common symbol in a superclass that could substitute for both symbols. Here is an example:

Say, we have:

class A { def f: A } class B { def f: B } val x: A | B = if (test) new A else new B val y = x.f

Then the denotation of y is SingleDenotation(NoSymbol, A | B).

Value parameters

symbol: The referencing symbol, or NoSymbol is none exists

Attributes

Supertypes: trait Showable

class PreDenotation

class Object

trait Matchable

class Any
Known subtypes: class MultiDenotation

class SingleDenotation

class NonSymSingleDenotation

class ErrorDenotation

class MissingRef

class NoQualifyingRef

class JointRefDenotation

class UniqueRefDenotation

class SymDenotation

class ClassDenotation

class PackageClassDenotation

object NoDenotation.type
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Attributes

Supertypes: class NonSymSingleDenotation

class SingleDenotation

class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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Known subtypes: class MissingRef

class NoQualifyingRef

Attributes

Supertypes: class NonSymSingleDenotation

class SingleDenotation

class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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An error denotation that provides more info about the missing reference. Produced by staticRef, consumed by requiredSymbol.

Attributes

Supertypes: trait Serializable

trait Product

trait Equals

class ErrorDenotation

class NonSymSingleDenotation

class SingleDenotation

class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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An overloaded denotation consisting of the alternatives of both given denotations.

Attributes

Supertypes: trait Serializable

trait Product

trait Equals

trait MultiPreDenotation

class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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Attributes

Supertypes: class PreDenotation

class Object

trait Matchable

class Any
Known subtypes: class DenotUnion

class MultiDenotation

An error denotation that provides more info about alternatives that were found but that do not qualify. Produced by staticRef, consumed by requiredSymbol.

Attributes

Supertypes: trait Serializable

trait Product

trait Equals

class ErrorDenotation

class NonSymSingleDenotation

class SingleDenotation

class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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Attributes

Supertypes: class SingleDenotation

class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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Known subtypes: class ErrorDenotation

class MissingRef

class NoQualifyingRef

class JointRefDenotation

class UniqueRefDenotation

A PreDenotation represents a group of single denotations or a single multi-denotation It is used as an optimization to avoid forming MultiDenotations too eagerly.

Attributes

Supertypes: class Object

trait Matchable

class Any
Known subtypes: class Denotation

class MultiDenotation

class SingleDenotation

class NonSymSingleDenotation

class ErrorDenotation

class MissingRef

class NoQualifyingRef

class JointRefDenotation

class UniqueRefDenotation

class SymDenotation

class ClassDenotation

class PackageClassDenotation

object NoDenotation.type

trait MultiPreDenotation

class DenotUnion
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A non-overloaded denotation

Attributes

Supertypes: class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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Known subtypes: class NonSymSingleDenotation

class ErrorDenotation

class MissingRef

class NoQualifyingRef

class JointRefDenotation

class UniqueRefDenotation

class SymDenotation

class ClassDenotation

class PackageClassDenotation

object NoDenotation.type
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An exception for accessing symbols that are no longer valid in current run

Attributes

Supertypes: class Exception

class Throwable

trait Serializable

class Object

trait Matchable

class Any
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Attributes

Supertypes: class NonSymSingleDenotation

class SingleDenotation

class Denotation

trait Showable

class PreDenotation

class Object

trait Matchable

class Any
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Value members

Concrete methods

Normally, tp1 & tp2, with extra care taken to return tp1 or tp2 directly if that's a valid answer. Special cases for matching methods and classes, with the possibility of returning NoType. Special handling of ExprTypes, where mixed intersections widen the ExprType away.

Attributes

A double definition

Attributes

If we are looking for a non-existing term name in a package, assume it is a package for which we do not have a directory and enter it.

Attributes

The current denotation of the static reference given by path, or a MissingRef or NoQualifyingRef instance, if it does not exist. if generateStubs is set, generates stubs for missing top-level symbols

Attributes

Implicits

In this article

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