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Copyright (c) 2002-2026, LAMP/EPFL
scala3-compiler-bootstrapped/dotty.tools/dotty.tools.dotc/dotty.tools.dotc.cc/CheckCaptures

CheckCaptures

dotty.tools.dotc.cc.CheckCaptures
See theCheckCaptures companion object
class CheckCaptures extends Recheck, SymTransformer

Attributes

Companion
object
Graph
Supertypes
class Recheck
class Phase
class Object
trait Matchable
class Any
Show all
Self type

Members list

Type members

Classlikes

class CaptureChecker(ictx: Context) extends Rechecker, CheckerAPI

Attributes

Supertypes
trait CheckerAPI
class Object
trait Matchable
class Any

Inherited classlikes

class Rechecker(ictx: Context)

The typechecker pass

The typechecker pass

Attributes

Inherited from:
Recheck
Supertypes
class Object
trait Matchable
class Any
Known subtypes

Value members

Concrete methods

override def description: String

Attributes

Definition Classes
override def isRunnable(using Context): Boolean

This property is queried before a phase is run. If it is false, the phase is skipped.

This property is queried before a phase is run. If it is false, the phase is skipped.

Attributes

Definition Classes
override def needsRecompute(tp: NamedType, lastDenotation: SingleDenotation)(using Context): Boolean

We normally need a recompute if the prefix is a SingletonType and the last denotation is not a SymDenotation. The SingletonType requirement is so that we don't widen TermRefs with non-path prefixes to their underlying type when recomputing their denotations with asSeenFrom. Such widened types would become illegal members of capture sets.

We normally need a recompute if the prefix is a SingletonType and the last denotation is not a SymDenotation. The SingletonType requirement is so that we don't widen TermRefs with non-path prefixes to their underlying type when recomputing their denotations with asSeenFrom. Such widened types would become illegal members of capture sets.

The SymDenotation requirement is so that we don't recompute termRefs of Symbols which should be handled by SymTransformers alone. However, if the underlying type of the prefix is a capturing type, we do need to recompute since in that case the prefix might carry a parameter refinement created in Setup, and we need to take these refinements into account.

Attributes

Definition Classes
override def phaseName: String

A name given to the Phase that can be used to debug the compiler. For instance, it is possible to print trees after a given phase using:

A name given to the Phase that can be used to debug the compiler. For instance, it is possible to print trees after a given phase using:

$ ./bin/scalac -Vprint:<phaseNameHere> sourceFile.scala

Attributes

Definition Classes
override def run(using Context): Unit

Attributes

Definition Classes

Inherited methods

final def <=(that: Phase): Boolean

Attributes

Inherited from:
Phase
def allowsImplicitSearch: Boolean

If set, implicit search is enabled

If set, implicit search is enabled

Attributes

Inherited from:
Phase
final def cancellable(body: Context ?=> Unit)(using Context): Boolean

Do not run if compile progress has been cancelled

Do not run if compile progress has been cancelled

Attributes

Inherited from:
Phase
override def changesBaseTypes: Boolean

Can this transform change the base types of a type?

Can this transform change the base types of a type?

Attributes

Definition Classes
Inherited from:
Recheck
def changesMembers: Boolean

Can this transform create or delete non-private members?

Can this transform create or delete non-private members?

Attributes

Inherited from:
Phase
def changesParents: Boolean

Can this transform change the parents of a class?

Can this transform change the parents of a class?

Attributes

Inherited from:
Phase
def checkPostCondition(tree: Tree)(using Context): Unit

Check what the phase achieves, to be called at any point after it is finished.

Check what the phase achieves, to be called at any point after it is finished.

Attributes

Inherited from:
Phase
def end: PhaseId

Attributes

Inherited from:
Phase
final def erasedTypes: Boolean

Attributes

Inherited from:
Phase
def exists: Boolean

True for all phases except NoPhase

True for all phases except NoPhase

Attributes

Inherited from:
Phase
def firstPrepPhase: Phase

The first phase that pepares for rechecking. This is usually preRecheckPhase but could also be before. Updated symbols will snap back to their denotations at firestPrepPhase after rechecking.

The first phase that pepares for rechecking. This is usually preRecheckPhase but could also be before. Updated symbols will snap back to their denotations at firestPrepPhase after rechecking.

Attributes

Inherited from:
Recheck
final def flatClasses: Boolean

Attributes

Inherited from:
Phase
final def hasNext: Boolean

Attributes

Inherited from:
Phase
def id: Int

The sequence position of this phase in the given context where 0 is reserved for NoPhase and the first real phase is at position 1. -1 if the phase is not installed in the context.

The sequence position of this phase in the given context where 0 is reserved for NoPhase and the first real phase is at position 1. -1 if the phase is not installed in the context.

Attributes

Inherited from:
Phase
def initContext(ctx: FreshContext): Unit

Attributes

Inherited from:
Phase
final def isAfterLastJavaPhase(using Context): Boolean

Attributes

Inherited from:
Phase
override def isCheckable: Boolean

Output should be checkable by TreeChecker

Output should be checkable by TreeChecker

Attributes

Definition Classes
Inherited from:
Recheck
def isEnabled(using Context): Boolean

This property is queried when phases are first assembled. If it is false, the phase will be dropped from the set of phases to traverse.

This property is queried when phases are first assembled. If it is false, the phase will be dropped from the set of phases to traverse.

Attributes

Inherited from:
Phase
def isTyper: Boolean

Is this phase the standard typerphase? True for TyperPhase, but not for other first phases (such as FromTasty or Parser). The predicate is tested in some places that perform checks and corrections. It's different from ctx.isAfterTyper (and cheaper to test).

Is this phase the standard typerphase? True for TyperPhase, but not for other first phases (such as FromTasty or Parser). The predicate is tested in some places that perform checks and corrections. It's different from ctx.isAfterTyper (and cheaper to test).

Attributes

Inherited from:
Phase
final def iterator: Iterator[Phase]

Attributes

Inherited from:
Phase
final def lambdaLifted: Boolean

Attributes

Inherited from:
Phase
def lastPhaseId(using Context): Int

The last phase during which the transformed denotations are valid

The last phase during which the transformed denotations are valid

Attributes

Inherited from:
DenotTransformer
final def megaPhase(using Context): Phase

Attributes

Inherited from:
Phase
final def monitor(doing: String)(body: Context ?=> Unit)(using Context): Boolean

Cancellable region, if not cancelled, run the body in the context of the current compilation unit. Enrich crash messages.

Cancellable region, if not cancelled, run the body in the context of the current compilation unit. Enrich crash messages.

Attributes

Inherited from:
Phase
final def next: Phase

Attributes

Inherited from:
Phase
final def patternTranslated: Boolean

Attributes

Inherited from:
Phase
def period: Period

Attributes

Inherited from:
Phase
def preRecheckPhase: PreRecheck

The phase before rechecking, used to setup symbol infos.

The phase before rechecking, used to setup symbol infos.

Attributes

Inherited from:
Recheck
final def prev: Phase

Attributes

Inherited from:
Phase
def printingContext(ctx: Context): Context

A hook that allows to transform the usual context passed to the function that prints a compilation unit after a phase

A hook that allows to transform the usual context passed to the function that prints a compilation unit after a phase

Attributes

Inherited from:
Phase
final def refChecked: Boolean

Attributes

Inherited from:
Phase
def relaxedTyping: Boolean

If set, allow missing or superfluous arguments in applications and type applications.

If set, allow missing or superfluous arguments in applications and type applications.

Attributes

Inherited from:
Phase
override def runOn(units: List[CompilationUnit])(using runCtx: Context): List[CompilationUnit]

Attributes

Definition Classes
Inherited from:
Recheck
inline def runSubPhase[T](id: SubPhase)(inline body: (SubPhase, Context) ?=> T)(using Context): T

Attributes

Inherited from:
Phase
def runsAfter: Set[String]

List of names of phases that should precede this phase

List of names of phases that should precede this phase

Attributes

Inherited from:
Phase
final def sameBaseTypesStartId: Int

Attributes

Inherited from:
Phase
final def sameMembersStartId: Int

Attributes

Inherited from:
Phase
final def sameParentsStartId: Int

Attributes

Inherited from:
Phase
override def show(tree: Tree)(using Context): String

Show tree with rechecked types instead of the types stored in the .tpe field

Show tree with rechecked types instead of the types stored in the .tpe field

Attributes

Definition Classes
Inherited from:
Recheck
def skipIfJava(using Context): Boolean

skip the phase for a Java compilation unit, may depend on -Xjava-tasty

skip the phase for a Java compilation unit, may depend on -Xjava-tasty

Attributes

Inherited from:
Phase
def start: Int

Attributes

Inherited from:
Phase
def subPhases: List[SubPhase]

for purposes of progress tracking, overridden in TyperPhase

for purposes of progress tracking, overridden in TyperPhase

Attributes

Inherited from:
Phase
override def toString: String

Returns a string representation of the object.

Returns a string representation of the object.

The default representation is platform dependent.

Attributes

Returns

a string representation of the object.

Definition Classes
Phase -> Any
Inherited from:
Phase
def transform(ref: SingleDenotation)(using Context): SingleDenotation

The transformation method

The transformation method

Attributes

Inherited from:
SymTransformer
def transformSym(symd: SymDenotation)(using Context): SymDenotation

Change denotation back to what it was before (pre-)rechecking`

Change denotation back to what it was before (pre-)rechecking`

Attributes

Inherited from:
Recheck
final def traversals: Int

Attributes

Inherited from:
Phase
def validFor(using Context): Period

The validity period of the transformed denotations in the given context

The validity period of the transformed denotations in the given context

Attributes

Inherited from:
DenotTransformer

Concrete fields

val knownFresh: EqHashMap[Symbol, List[ClassSymbol]]

A cache that stores for each class the classifiers of all fresh instances in the types of its fields.

A cache that stores for each class the classifiers of all fresh instances in the types of its fields.

Attributes

Inherited fields

val prevSelDenots: HashMap[NamedType, Denotation]

A map from NamedTypes to the denotations they had before this phase. Needed so that we can reset them after this phase.

A map from NamedTypes to the denotations they had before this phase. Needed so that we can reset them after this phase.

Attributes

Inherited from:
Recheck
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Copyright (c) 2002-2026, LAMP/EPFL
Copyright (c) 2002-2026, LAMP/EPFL