scala.tools.nsc.transform.patmat.MatchOptimization

# SwitchEmission

#### trait SwitchEmission extends TreeMakers with MatchMonadInterface

Source
  MatchOptimization.scala

Linear Supertypes
MatchOptimization.TreeMakers, MatchOptimization.CodegenCore, MatchOptimization.TypedSubstitution, MatchOptimization.MatchMonadInterface, AnyRef, Any
Known Subclasses
MatchOptimizer, OptimizingMatchTranslator
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Inherited

1. SwitchEmission
2. TreeMakers
3. CodegenCore
4. TypedSubstitution
5. MatchMonadInterface
6. AnyRef
7. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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### Type Members

1. #### trait AbsCodegen extends AnyRef

   Definition Classes
     CodegenCore

2. #### case class AlternativesTreeMaker(prevBinder: Global.Symbol, altss: List[List[TreeMaker]], pos: Global.Position) extends TreeMaker with NoNewBinders with Product with Serializable

   Definition Classes
     TreeMakers

3. #### case class BodyTreeMaker(body: Global.Tree, matchPt: Global.Type) extends TreeMaker with NoNewBinders with Product with Serializable

   Definition Classes
     TreeMakers

4. #### trait Casegen extends AbsCodegen

   Definition Classes
     CodegenCore

5. #### abstract class CommonCodegen extends AbsCodegen

   Definition Classes
     CodegenCore

6. #### sealed abstract class CondTreeMaker extends FunTreeMaker

   Definition Classes
     TreeMakers

7. #### case class EqualityTestTreeMaker(prevBinder: Global.Symbol, patTree: Global.Tree, pos: Global.Position) extends CondTreeMaker with Product with Serializable

   Definition Classes
     TreeMakers

8. #### case class ExtractorTreeMaker(extractor: Global.Tree, extraCond: Option[Global.Tree], nextBinder: Global.Symbol)(subPatBinders: List[Global.Symbol], subPatRefs: List[Global.Tree], extractorReturnsBoolean: Boolean, checkedLength: Option[Int], prevBinder: Global.Symbol, ignoredSubPatBinders: Set[Global.Symbol]) extends FunTreeMaker with PreserveSubPatBinders with Product with Serializable

   Make a TreeMaker that will result in an extractor call specified by `extractor` the next TreeMaker (here, we don't know which it'll be) is chained after this one by flatMap'ing a function with binder `nextBinder` over our extractor's result the function's body is determined by the next TreeMaker (furthermore, the interpretation of `flatMap` depends on the codegen instance we're using).

   Make a TreeMaker that will result in an extractor call specified by `extractor` the next TreeMaker (here, we don't know which it'll be) is chained after this one by flatMap'ing a function with binder `nextBinder` over our extractor's result the function's body is determined by the next TreeMaker (furthermore, the interpretation of `flatMap` depends on the codegen instance we're using).

   The values for the subpatterns, as computed by the extractor call in `extractor`, are stored in local variables that re-use the symbols in `subPatBinders`. This makes extractor patterns more debuggable (SI-5739).

   Definition Classes
     TreeMakers

9. #### sealed abstract class FunTreeMaker extends TreeMaker

   Definition Classes
     TreeMakers

10. #### case class GuardTreeMaker(guardTree: Global.Tree) extends TreeMaker with NoNewBinders with Product with Serializable

    Definition Classes
      TreeMakers

11. #### sealed trait NoNewBinders extends TreeMaker

    Definition Classes
      TreeMakers

12. #### sealed trait PreserveSubPatBinders extends TreeMaker

    Definition Classes
      TreeMakers

13. #### case class ProductExtractorTreeMaker(prevBinder: Global.Symbol, extraCond: Option[Global.Tree])(subPatBinders: List[Global.Symbol], subPatRefs: List[Global.Tree], mutableBinders: List[Global.Symbol], binderKnownNonNull: Boolean, ignoredSubPatBinders: Set[Global.Symbol]) extends FunTreeMaker with PreserveSubPatBinders with Product with Serializable

    An optimized version of ExtractorTreeMaker for Products.

    An optimized version of ExtractorTreeMaker for Products. For now, this is hard-coded to case classes, and we simply extract the case class fields.

    The values for the subpatterns, as specified by the case class fields at the time of extraction, are stored in local variables that re-use the symbols in `subPatBinders`. This makes extractor patterns more debuggable (SI-5739) as well as avoiding mutation after the pattern has been matched (SI-5158, SI-6070)

    TODO: make this user-definable as follows When a companion object defines a method `def unapply_1(x: T): U_1`, but no `def unapply` or `def unapplySeq`, the extractor is considered to match any non-null value of type T the pattern is expected to have as many sub-patterns as there are `def unapply_I(x: T): U_I` methods, and the type of the I'th sub-pattern is `U_I`. The same exception for Seq patterns applies: if the last extractor is of type `Seq[U_N]`, the pattern must have at least N arguments (exactly N if the last argument is annotated with `: _*`). The arguments starting at N (and beyond) are taken from the sequence returned by apply_N, and it is checked that that sequence has enough elements to provide values for all expected sub-patterns.

    For a case class C, the implementation is assumed to be `def unapply_I(x: C) = x._I`, and the extractor call is inlined under that assumption.

    Definition Classes
      TreeMakers

14. #### class RegularSwitchMaker extends SwitchMaker

15. #### case class SubstOnlyTreeMaker(prevBinder: Global.Symbol, nextBinder: Global.Symbol) extends TreeMaker with Product with Serializable

    Definition Classes
      TreeMakers

16. #### class Substitution extends AnyRef

    Definition Classes
      TypedSubstitution

17. #### abstract class SwitchMaker extends AnyRef

18. #### abstract class TreeMaker extends AnyRef

    Definition Classes
      TreeMakers

19. #### case class TrivialTreeMaker(tree: Global.Tree) extends TreeMaker with NoNewBinders with Product with Serializable

    Definition Classes
      TreeMakers

20. #### case class TypeTestTreeMaker(prevBinder: Global.Symbol, testedBinder: Global.Symbol, expectedTp: Global.Type, nextBinderTp: Global.Type)(pos: Global.Position, extractorArgTypeTest: Boolean = false) extends CondTreeMaker with Product with Serializable

    implements the run-time aspects of (§8.2) (typedPattern has already done the necessary type transformations)

    implements the run-time aspects of (§8.2) (typedPattern has already done the necessary type transformations)

    Type patterns consist of types, type variables, and wildcards. A type pattern T is of one of the following forms:

    - A reference to a class C, p.C, or T#C. This type pattern matches any non-null instance of the given class. Note that the prefix of the class, if it is given, is relevant for determining class instances. For instance, the pattern p.C matches only instances of classes C which were created with the path p as prefix. The bottom types scala.Nothing and scala.Null cannot be used as type patterns, because they would match nothing in any case.
    - A singleton type p.type. This type pattern matches only the value denoted by the path p (that is, a pattern match involved a comparison of the matched value with p using method eq in class AnyRef). // TODO: the actual pattern matcher uses ==, so that's what I'm using for now // https://issues.scala-lang.org/browse/SI-4577 "pattern matcher, still disappointing us at equality time"
    - A compound type pattern T1 with ... with Tn where each Ti is a type pat- tern. This type pattern matches all values that are matched by each of the type patterns Ti.
    - A parameterized type pattern T[a1,...,an], where the ai are type variable patterns or wildcards _. This type pattern matches all values which match T for some arbitrary instantiation of the type variables and wildcards. The bounds or alias type of these type variable are determined as described in (§8.3).
    - A parameterized type pattern scala.Array[T1], where T1 is a type pattern. // TODO This type pattern matches any non-null instance of type scala.Array[U1], where U1 is a type matched by T1.
    Definition Classes
      TreeMakers

### Abstract Value Members

1. #### abstract def analyzeCases(prevBinder: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type, suppression: MatchOptimization.Suppression): Unit

   Definition Classes
     TreeMakers

2. #### abstract def codegen: AbsCodegen

   Definition Classes
     CodegenCore

3. #### abstract def optimizeCases(prevBinder: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type): (List[List[TreeMaker]], List[Global.Tree])

   Definition Classes
     TreeMakers

4. #### abstract val typer: (analyzer)#Typer

   Definition Classes
     MatchMonadInterface

### Concrete Value Members

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

   Definition Classes
     AnyRef → Any

2. #### final def ##(): Int

   Definition Classes
     AnyRef → Any

3. #### def +(other: String): String

   Implicit information
     This member is added by an implicit conversion from SwitchEmission to any2stringadd[SwitchEmission] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

4. #### def ->[B](y: B): (SwitchEmission, B)

   Implicit information
     This member is added by an implicit conversion from SwitchEmission to ArrowAssoc[SwitchEmission] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()

5. #### final def ==(arg0: Any): Boolean

   Definition Classes
     AnyRef → Any

6. #### object EmptySubstitution extends Substitution

   Definition Classes
     TypedSubstitution

7. #### object IrrefutableExtractorTreeMaker

   Definition Classes
     TreeMakers

8. #### object Substitution

   Definition Classes
     TypedSubstitution

9. #### object TypeTestTreeMaker extends Serializable

   Definition Classes
     TreeMakers

10. #### final def asInstanceOf[T0]: T0

    Definition Classes
      Any

11. #### def clone(): AnyRef

    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

12. #### def combineCases(scrut: Global.Tree, scrutSym: Global.Symbol, casesRaw: List[List[TreeMaker]], pt: Global.Type, owner: Global.Symbol, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree]): Global.Tree

    Definition Classes
      TreeMakers

13. #### def combineCasesNoSubstOnly(scrut: Global.Tree, scrutSym: Global.Symbol, casesNoSubstOnly: List[List[TreeMaker]], pt: Global.Type, owner: Global.Symbol, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree]): Global.Tree

    Definition Classes
      TreeMakers

14. #### def combineExtractors(treeMakers: List[TreeMaker])(casegen: Casegen): Global.Tree

    Definition Classes
      TreeMakers

15. #### val debugInfoEmitVars: Boolean

    Attributes
      protected
    Definition Classes
      TreeMakers

16. #### def emitSwitch(scrut: Global.Tree, scrutSym: Global.Symbol, cases: List[List[TreeMaker]], pt: Global.Type, matchFailGenOverride: Option[(Global.Tree) ⇒ Global.Tree], unchecked: Boolean): Option[Global.Tree]

    Definition Classes
      SwitchEmission → TreeMakers

17. #### def emitTypeSwitch(bindersAndCases: List[(Global.Symbol, List[TreeMaker])], pt: Global.Type): Option[List[Global.CaseDef]]

    Definition Classes
      SwitchEmission → TreeMakers

18. #### def ensuring(cond: (SwitchEmission) ⇒ Boolean, msg: ⇒ Any): SwitchEmission

    Implicit information
      This member is added by an implicit conversion from SwitchEmission to Ensuring[SwitchEmission] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

19. #### def ensuring(cond: (SwitchEmission) ⇒ Boolean): SwitchEmission

    Implicit information
      This member is added by an implicit conversion from SwitchEmission to Ensuring[SwitchEmission] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

20. #### def ensuring(cond: Boolean, msg: ⇒ Any): SwitchEmission

    Implicit information
      This member is added by an implicit conversion from SwitchEmission to Ensuring[SwitchEmission] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

21. #### def ensuring(cond: Boolean): SwitchEmission

    Implicit information
      This member is added by an implicit conversion from SwitchEmission to Ensuring[SwitchEmission] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

22. #### final def eq(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

23. #### def equals(arg0: Any): Boolean

    Definition Classes
      AnyRef → Any

24. #### def finalize(): Unit

    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )

25. #### def fixerUpper(origOwner: Global.Symbol, pos: Global.Position): Global.Traverser

    Attributes
      protected
    Definition Classes
      TreeMakers

26. #### def formatted(fmtstr: String): String

    Implicit information
      This member is added by an implicit conversion from SwitchEmission to StringFormat[SwitchEmission] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

27. #### def freshName(prefix: String): Global.TermName

    Definition Classes
      CodegenCore

28. #### def freshSym(pos: Global.Position, tp: Global.Type = NoType, prefix: String = "x"): Global.TermSymbol

    Definition Classes
      CodegenCore

29. #### final def getClass(): Class[_]

    Definition Classes
      AnyRef → Any

30. #### def hashCode(): Int

    Definition Classes
      AnyRef → Any

31. #### final def isInstanceOf[T0]: Boolean

    Definition Classes
      Any

32. #### val matchOwner: Global.Symbol

    Definition Classes
      MatchMonadInterface

33. #### final def ne(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

34. #### def newSynthCaseLabel(name: String): Global.MethodSymbol

    Definition Classes
      CodegenCore

35. #### final def notify(): Unit

    Definition Classes
      AnyRef

36. #### final def notifyAll(): Unit

    Definition Classes
      AnyRef

37. #### def propagateSubstitution(treeMakers: List[TreeMaker], initial: Substitution): List[TreeMaker]

    Definition Classes
      TreeMakers

38. #### def pureType(tp: Global.Type): Global.Type

    Definition Classes
      MatchMonadInterface

39. #### def removeSubstOnly(makers: List[TreeMaker]): collection.immutable.List[TreeMaker]

    Definition Classes
      TreeMakers

40. #### def reportMissingCases(pos: Global.Position, counterExamples: List[String]): Unit

    Definition Classes
      MatchMonadInterface

41. #### def reportUnreachable(pos: Global.Position): Unit

    Definition Classes
      MatchMonadInterface

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

    Definition Classes
      AnyRef

43. #### def toString(): String

    Definition Classes
      AnyRef → Any

44. #### final def wait(): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

46. #### final def wait(arg0: Long): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

47. #### def →[B](y: B): (SwitchEmission, B)

    Implicit information
      This member is added by an implicit conversion from SwitchEmission to ArrowAssoc[SwitchEmission] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from MatchOptimization.TreeMakers

### Inherited from MatchOptimization.CodegenCore

### Inherited from MatchOptimization.TypedSubstitution

### Inherited from MatchOptimization.MatchMonadInterface

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from SwitchEmission to any2stringadd[SwitchEmission]

### Inherited by implicit conversion StringFormat from SwitchEmission to StringFormat[SwitchEmission]

### Inherited by implicit conversion Ensuring from SwitchEmission to Ensuring[SwitchEmission]

### Inherited by implicit conversion ArrowAssoc from SwitchEmission to ArrowAssoc[SwitchEmission]

### Ungrouped