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Break out CaptureRef into a separate file
Move extension methods on CaptureRef into CaptureRef itself or into CaptureOps
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package dotty.tools | ||
| package dotc | ||
| package cc | ||
|
|
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| import core.* | ||
| import Types.*, Symbols.*, Contexts.*, Decorators.* | ||
| import util.{SimpleIdentitySet, Property} | ||
| import typer.ErrorReporting.Addenda | ||
| import TypeComparer.subsumesExistentially | ||
| import util.common.alwaysTrue | ||
| import scala.collection.mutable | ||
| import CCState.* | ||
| import Periods.NoRunId | ||
| import compiletime.uninitialized | ||
| import StdNames.nme | ||
|
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| /** A trait for references in CaptureSets. These can be NamedTypes, ThisTypes or ParamRefs, | ||
| * as well as two kinds of AnnotatedTypes representing reach and maybe capabilities. | ||
| */ | ||
| trait CaptureRef extends TypeProxy, ValueType: | ||
| private var myCaptureSet: CaptureSet | Null = uninitialized | ||
| private var myCaptureSetRunId: Int = NoRunId | ||
| private var mySingletonCaptureSet: CaptureSet.Const | Null = null | ||
|
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| /** Is the reference tracked? This is true if it can be tracked and the capture | ||
| * set of the underlying type is not always empty. | ||
| */ | ||
| final def isTracked(using Context): Boolean = | ||
| this.isTrackableRef && (isMaxCapability || !captureSetOfInfo.isAlwaysEmpty) | ||
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| /** Is this a reach reference of the form `x*`? */ | ||
| final def isReach(using Context): Boolean = this match | ||
| case AnnotatedType(_, annot) => annot.symbol == defn.ReachCapabilityAnnot | ||
| case _ => false | ||
|
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| /** Is this a maybe reference of the form `x?`? */ | ||
| final def isMaybe(using Context): Boolean = this match | ||
| case AnnotatedType(_, annot) => annot.symbol == defn.MaybeCapabilityAnnot | ||
| case _ => false | ||
|
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| final def stripReach(using Context): CaptureRef = | ||
| if isReach then | ||
| val AnnotatedType(parent: CaptureRef, _) = this: @unchecked | ||
| parent | ||
| else this | ||
|
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| final def stripMaybe(using Context): CaptureRef = | ||
| if isMaybe then | ||
| val AnnotatedType(parent: CaptureRef, _) = this: @unchecked | ||
| parent | ||
| else this | ||
|
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| /** Is this reference the generic root capability `cap` ? */ | ||
| final def isRootCapability(using Context): Boolean = this match | ||
| case tp: TermRef => tp.name == nme.CAPTURE_ROOT && tp.symbol == defn.captureRoot | ||
| case _ => false | ||
|
|
||
| /** Is this reference capability that does not derive from another capability ? */ | ||
| final def isMaxCapability(using Context): Boolean = this match | ||
| case tp: TermRef => tp.isRootCapability || tp.info.derivesFrom(defn.Caps_Exists) | ||
| case tp: TermParamRef => tp.underlying.derivesFrom(defn.Caps_Exists) | ||
| case _ => false | ||
|
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| /** Normalize reference so that it can be compared with `eq` for equality */ | ||
| final def normalizedRef(using Context): CaptureRef = this match | ||
| case tp @ AnnotatedType(parent: CaptureRef, annot) if tp.isTrackableRef => | ||
| tp.derivedAnnotatedType(parent.normalizedRef, annot) | ||
| case tp: TermRef if tp.isTrackableRef => | ||
| tp.symbol.termRef | ||
| case _ => this | ||
|
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||
| /** The capture set consisting of exactly this reference */ | ||
| final def singletonCaptureSet(using Context): CaptureSet.Const = | ||
| if mySingletonCaptureSet == null then | ||
| mySingletonCaptureSet = CaptureSet(this.normalizedRef) | ||
| mySingletonCaptureSet.uncheckedNN | ||
|
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||
| /** The capture set of the type underlying this reference */ | ||
| final def captureSetOfInfo(using Context): CaptureSet = | ||
| if ctx.runId == myCaptureSetRunId then myCaptureSet.nn | ||
| else if myCaptureSet.asInstanceOf[AnyRef] eq CaptureSet.Pending then CaptureSet.empty | ||
| else | ||
| myCaptureSet = CaptureSet.Pending | ||
| val computed = CaptureSet.ofInfo(this) | ||
| if !isCaptureChecking || underlying.isProvisional then | ||
| myCaptureSet = null | ||
| else | ||
| myCaptureSet = computed | ||
| myCaptureSetRunId = ctx.runId | ||
| computed | ||
|
|
||
| final def invalidateCaches() = | ||
| myCaptureSetRunId = NoRunId | ||
|
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||
| /** x subsumes x | ||
| * this subsumes this.f | ||
| * x subsumes y ==> x* subsumes y, x subsumes y? | ||
| * x subsumes y ==> x* subsumes y*, x? subsumes y? | ||
| * x: x1.type /\ x1 subsumes y ==> x subsumes y | ||
| */ | ||
| final def subsumes(y: CaptureRef)(using Context): Boolean = | ||
| (this eq y) | ||
| || this.isRootCapability | ||
| || y.match | ||
| case y: TermRef => | ||
| (y.prefix eq this) | ||
| || y.info.match | ||
| case y1: SingletonCaptureRef => this.subsumes(y1) | ||
| case _ => false | ||
| case MaybeCapability(y1) => this.stripMaybe.subsumes(y1) | ||
| case _ => false | ||
| || this.match | ||
| case ReachCapability(x1) => x1.subsumes(y.stripReach) | ||
| case x: TermRef => | ||
| x.info match | ||
| case x1: SingletonCaptureRef => x1.subsumes(y) | ||
| case _ => false | ||
| case x: TermParamRef => subsumesExistentially(x, y) | ||
| case _ => false | ||
|
|
||
| end CaptureRef | ||
|
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||
| trait SingletonCaptureRef extends SingletonType, CaptureRef | ||
|
|
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