Packages

abstract class TailCalls extends SubComponent with Transform

Perform tail recursive call elimination.

Source
TailCalls.scala
Version

1.0

Linear Supertypes
Transform, SubComponent, AnyRef, Any
Known Subclasses
tailCalls
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. TailCalls
  2. Transform
  3. SubComponent
  4. AnyRef
  5. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
  1. Hide All
  2. Show All
Visibility
  1. Public
  2. All

Instance Constructors

  1. new TailCalls()

Type Members

  1. abstract class StdPhase extends GlobalPhase

    A standard phase template

    A standard phase template

    Definition Classes
    SubComponent
  2. class Phase extends StdPhase

    The phase defined by this transform

  3. class TailCallElimination extends Global.Transformer

    A Tail Call Transformer

    A Tail Call Transformer

    Version

    1.1 What it does: Finds method calls in tail-position and replaces them with jumps. A call is in a tail-position if it is the last instruction to be executed in the body of a method. This is done by recursing over the trees that may contain calls in tail-position (trees that can't contain such calls are not transformed). However, they are not that many. Self-recursive calls in tail-position are replaced by jumps to a label at the beginning of the method. As the JVM provides no way to jump from a method to another one, non-recursive calls in tail-position are not optimized. A method call is self-recursive if it calls the current method and the method is final (otherwise, it could be a call to an overridden method in a subclass). Furthermore, if the method has @specialized annotated type parameters, the recursive call must contain these parameters as type arguments. Recursive calls on a different instance are optimized. Since 'this' is not a local variable, a dummy local val is added and used as a label parameter. The backend knows to load the corresponding argument in the 'this' (local at index 0). This dummy local is never used and should be cleaned up by dead code elimination (when enabled). This phase has been moved before pattern matching to catch more of the common cases of tail recursive functions. This means that more cases should be taken into account (like nested function, and pattern cases). If a method contains self-recursive calls, a label is added to at the beginning of its body and the calls are replaced by jumps to that label. Assumes: Uncurry has been run already, and no multiple parameter lists exist.

  4. class TailPosLabelsTraverser extends Global.Traverser

Abstract Value Members

  1. abstract val global: Global

    The global environment; overridden by instantiation in Global.

    The global environment; overridden by instantiation in Global.

    Definition Classes
    SubComponent
  2. abstract val runsAfter: List[String]

    Names of phases that must run before this phase.

    Names of phases that must run before this phase.

    Definition Classes
    SubComponent
  3. abstract val runsRightAfter: Option[String]

    Name of the phase that this phase must follow immediately.

    Name of the phase that this phase must follow immediately.

    Definition Classes
    SubComponent

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
    This member is added by an implicit conversion from TailCalls to any2stringadd[TailCalls] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (TailCalls, B)
    Implicit
    This member is added by an implicit conversion from TailCalls to ArrowAssoc[TailCalls] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. final def afterOwnPhase[T](op: ⇒ T): T
    Definition Classes
    SubComponent
    Annotations
    @inline()
  7. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  8. final def beforeOwnPhase[T](op: ⇒ T): T
    Definition Classes
    SubComponent
    Annotations
    @inline()
  9. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  10. def enabled: Boolean

    Is this component enabled? Default is true.

    Is this component enabled? Default is true.

    Definition Classes
    SubComponent
  11. def ensuring(cond: (TailCalls) ⇒ Boolean, msg: ⇒ Any): TailCalls
    Implicit
    This member is added by an implicit conversion from TailCalls to Ensuring[TailCalls] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. def ensuring(cond: (TailCalls) ⇒ Boolean): TailCalls
    Implicit
    This member is added by an implicit conversion from TailCalls to Ensuring[TailCalls] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  13. def ensuring(cond: Boolean, msg: ⇒ Any): TailCalls
    Implicit
    This member is added by an implicit conversion from TailCalls to Ensuring[TailCalls] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  14. def ensuring(cond: Boolean): TailCalls
    Implicit
    This member is added by an implicit conversion from TailCalls to Ensuring[TailCalls] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  15. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  16. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  17. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  18. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from TailCalls to StringFormat[TailCalls] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  19. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  20. def hashCode(): Int

    SubComponent are added to a HashSet and two phases are the same if they have the same name

    SubComponent are added to a HashSet and two phases are the same if they have the same name

    Definition Classes
    SubComponent → AnyRef → Any
  21. val initial: Boolean

    True if this phase runs before all other phases.

    True if this phase runs before all other phases. Usually, parser.

    Definition Classes
    SubComponent
  22. val internal: Boolean

    True if this phase is not provided by a plug-in.

    True if this phase is not provided by a plug-in.

    Definition Classes
    SubComponent
  23. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  24. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  25. def newPhase(prev: nsc.Phase): StdPhase

    Create a new phase which applies transformer

    Create a new phase which applies transformer

    Definition Classes
    TailCalls → Transform → SubComponent
  26. def newTransformer(unit: Global.CompilationUnit): Global.Transformer

    The transformer factory

    The transformer factory

    Definition Classes
    TailCalls → Transform
  27. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  28. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  29. def ownPhase: nsc.Phase

    The phase corresponding to this subcomponent in the current compiler run

    The phase corresponding to this subcomponent in the current compiler run

    Definition Classes
    SubComponent
  30. val phaseName: String

    The name of the phase

    The name of the phase

    Definition Classes
    TailCalls → SubComponent
  31. def phaseNewFlags: Long

    New flags defined by the phase which are not valid before

    New flags defined by the phase which are not valid before

    Definition Classes
    SubComponent
  32. def phaseNextFlags: Long

    New flags defined by the phase which are not valid until immediately after it

    New flags defined by the phase which are not valid until immediately after it

    Definition Classes
    SubComponent
  33. val requires: List[String]

    Names of phases required by this component.

    Names of phases required by this component. Default is Nil.

    Definition Classes
    SubComponent
  34. val runsBefore: List[String]

    Names of phases that must run after this phase.

    Names of phases that must run after this phase. Default is Nil.

    Definition Classes
    SubComponent
  35. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  36. val terminal: Boolean

    True if this phase runs after all other phases.

    True if this phase runs after all other phases. Usually, terminal.

    Definition Classes
    SubComponent
  37. def toString(): String
    Definition Classes
    AnyRef → Any
  38. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  39. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  40. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @native() @throws( ... )
  41. def →[B](y: B): (TailCalls, B)
    Implicit
    This member is added by an implicit conversion from TailCalls to ArrowAssoc[TailCalls] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from Transform

Inherited from SubComponent

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from TailCalls to any2stringadd[TailCalls]

Inherited by implicit conversion StringFormat from TailCalls to StringFormat[TailCalls]

Inherited by implicit conversion Ensuring from TailCalls to Ensuring[TailCalls]

Inherited by implicit conversion ArrowAssoc from TailCalls to ArrowAssoc[TailCalls]

Ungrouped