dotty.tools.dotc.core

Contexts

Related Doc: package core

object Contexts

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  1. abstract class Context extends Periods with Substituters with TypeOps with Phases with Printers with Symbols with SymDenotations with Reporting with NamerContextOps with Cloneable

    A context is passed basically everywhere in dotc.

    A context is passed basically everywhere in dotc. This is convenient but carries the risk of captured contexts in objects that turn into space leaks. To combat this risk, here are some conventions to follow:

    • Never let an implicit context be an argument of a class whose instances live longer than the context.
    • Classes that need contexts for their initialization take an explicit parameter named initctx. They pass initctx to all positions where it is needed (and these positions should all be part of the intialization sequence of the class).
    • Classes that need contexts that survive initialization are instead passed a "condensed context", typically named cctx (or they create one). Condensed contexts just add some basic information to the context base without the risk of capturing complete trees.
    • To make sure these rules are kept, it would be good to do a sanity check using bytecode inspection with javap or scalap: Keep track of all class fields of type context; allow them only in whitelisted classes (which should be short-lived).

  2. class ContextBase extends ContextState with DenotationsBase with PhasesBase

    A context base defines state and associated methods that exist once per compiler run.

  3. class ContextState extends AnyRef

    The essential mutable state of a context base, collected into a common class

  4. abstract class FreshContext extends Context

    A fresh context allows selective modification of its attributes using the with...

    A fresh context allows selective modification of its attributes using the with... methods.

  5. implicit final class FreshModeChanges extends AnyVal

  6. class GADTMap extends AnyRef

  7. implicit final class ModeChanges extends AnyVal

  8. class RunInfo extends ImplicitRunInfo with ConstraintRunInfo

    Info that changes on each compiler run

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  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. object Context

  5. object NoContext extends Context

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  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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  8. final def eq(arg0: AnyRef): Boolean

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  9. def equals(arg0: Any): Boolean

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  10. def finalize(): Unit

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  11. final def getClass(): Class[_]

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  12. def hashCode(): Int

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  13. final def isInstanceOf[T0]: Boolean

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  14. final def ne(arg0: AnyRef): Boolean

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  15. final def notify(): Unit

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  16. final def notifyAll(): Unit

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  17. final def synchronized[T0](arg0: ⇒ T0): T0

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  18. def toString(): String

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  19. final def wait(): Unit

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  20. final def wait(arg0: Long, arg1: Int): Unit

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  21. final def wait(arg0: Long): Unit

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