c

scala.tools.nsc.transform

SpecializeTypes

abstract class SpecializeTypes extends SubComponent with InfoTransform with TypingTransformers

Specialize code on types.

Make sure you've read the thesis:

Iulian Dragos: Compiling Scala for Performance (chapter 4)

There are some things worth noting, (possibly) not mentioned there: 0) Make sure you understand the meaning of various SpecializedInfo descriptors defined below.

1) Specializing traits by introducing bridges in specialized methods of the specialized trait may introduce problems during mixin composition. Concretely, it may cause cyclic calls and result in a stack overflow. See ticket #4351. This was solved by introducing an Abstract specialized info descriptor. Instead of generating a bridge in the trait, an abstract method is generated.

2) Specialized private members sometimes have to be switched to protected. In some cases, even this is not enough. Example:

class A[@specialized T](protected val d: T) {
  def foo(that: A[T]) = that.d
}

Specialization will generate a specialized class and a specialized method:

class A$mcI$sp(protected val d: Int) extends A[Int] {
  def foo(that: A[Int]) = foo$mcI$sp(that)
  def foo(that: A[Int]) = that.d
}

Above, A$mcI$sp cannot access d, so the method cannot be typechecked.

Source
SpecializeTypes.scala
Linear Supertypes
TypingTransformers, InfoTransform, Transform, SubComponent, AnyRef, Any
Known Subclasses
specializeTypes
Ordering
  1. Alphabetic
  2. By Inheritance
Inherited
  1. SpecializeTypes
  2. TypingTransformers
  3. InfoTransform
  4. Transform
  5. SubComponent
  6. AnyRef
  7. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new SpecializeTypes()

Type Members

  1. abstract class StdPhase extends GlobalPhase

    A standard phase template

    A standard phase template

    Definition Classes
    SubComponent
  2. class Phase extends InfoTransform.Phase
    Definition Classes
    InfoTransform
  3. case class Abstract (t: Global.Symbol) extends SpecializedInfo with Product with Serializable

    Symbol is a specialized abstract method, either specialized or original.

    Symbol is a specialized abstract method, either specialized or original. The original t is abstract.

  4. class Duplicator extends Duplicators

    This duplicator additionally performs casts of expressions if that is allowed by the casts map.

  5. case class Forward (t: Global.Symbol) extends SpecializedInfo with Product with Serializable

    Symbol is a method that should be forwarded to 't'

  6. case class Implementation (target: Global.Symbol) extends SpecializedInfo with Product with Serializable

    Symbol is a specialized method whose body should be the target's method body.

  7. class ImplementationAdapter extends Global.TreeSymSubstituter

    A tree symbol substituter that substitutes on type skolems.

    A tree symbol substituter that substitutes on type skolems. If a type parameter is a skolem, it looks for the original symbol in the 'from' and maps it to the corresponding new symbol. The new symbol should probably be a type skolem as well (not enforced).

    All private members are made protected in order to be accessible from specialized classes.

  8. case class NormalizedMember (target: Global.Symbol) extends SpecializedInfo with Product with Serializable

    Symbol is a normalized member obtained by specializing 'target'.

  9. case class Overload (sym: Global.Symbol, env: TypeEnv) extends Product with Serializable
  10. case class SpecialOverload (original: Global.Symbol, env: TypeEnv) extends SpecializedInfo with Product with Serializable

    Symbol is a special overloaded method of 'original', in the environment env.

  11. case class SpecialOverride (target: Global.Symbol) extends SpecializedInfo with Product with Serializable

    Symbol is a specialized override paired with target.

  12. case class SpecialSuperAccessor (t: Global.Symbol) extends SpecializedInfo with Product with Serializable

    Symbol is a special overload of the super accessor.

  13. class SpecializationDuplicator extends Duplicator

    Introduced to fix scala/bug#7343: Phase ordering problem between Duplicators and Specialization.

    Introduced to fix scala/bug#7343: Phase ordering problem between Duplicators and Specialization. brief explanation: specialization rewires class parents during info transformation, and the new info then guides the tree changes. But if a symbol is created during duplication, which runs after specialization, its info is not visited and thus the corresponding tree is not specialized. One manifestation is the following: object Test { class Parent[@specialized(Int) T]

    def spec_method[@specialized(Int) T](t: T, expectedXSuper: String) = { class X extends Parent[T]() // even in the specialized variant, the local X class // doesn't extend Parent$mcI$sp, since its symbol has // been created after specialization and was not seen // by specialization's info transformer. ... } } We fix this by forcing duplication to take place before specialization.

    Note: The constructors phase (which also uses duplication) comes after erasure and uses the post-erasure typer => we must protect it from the beforeSpecialization phase shifting.

  14. class SpecializationPhase extends Phase
  15. class SpecializationTransformer extends Global.Transformer
  16. case class SpecializedAccessor (target: Global.Symbol) extends SpecializedInfo with Product with Serializable

    Symbol is a specialized accessor for the target field.

  17. abstract class SpecializedInfo extends AnyRef
  18. case class SpecializedInnerClass (target: Global.Symbol, env: TypeEnv) extends SpecializedInfo with Product with Serializable

    A specialized inner class that specializes original inner class target on a type parameter of the enclosing class, in the typeenv env.

  19. type TypeEnv = Map[Global.Symbol, Global.Type]
  20. abstract class TypingTransformer extends Global.Transformer
    Definition Classes
    TypingTransformers

Abstract Value Members

  1. abstract val global: Global
    Definition Classes
    TypingTransformers
  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 SpecializeTypes to any2stringadd[SpecializeTypes] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (SpecializeTypes, B)
    Implicit
    This member is added by an implicit conversion from SpecializeTypes to ArrowAssoc[SpecializeTypes] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. def addConcreteSpecMethod(m: Global.Symbol): Unit

    Add method m to the set of symbols for which we need an implementation tree in the tree transformer.

    Add method m to the set of symbols for which we need an implementation tree in the tree transformer.

    Note

    This field is part of the specializeTypes subcomponent, so any symbols that here are not garbage collected at the end of a compiler run!

  7. final def afterOwnPhase[T](op: ⇒ T): T
    Definition Classes
    SubComponent
    Annotations
    @inline()
  8. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  9. final def beforeOwnPhase[T](op: ⇒ T): T
    Definition Classes
    SubComponent
    Annotations
    @inline()
  10. def changesBaseClasses: Boolean

    This phase changes base classes.

    This phase changes base classes.

    Definition Classes
    SpecializeTypes → InfoTransform
  11. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  12. def concreteTypes(sym: Global.Symbol): List[Global.Type]

    Return the types sym should be specialized at.

    Return the types sym should be specialized at. This may be some of the primitive types or AnyRef. AnyRef means that a new type parameter T will be generated later, known to be a subtype of AnyRef (T <: AnyRef). These are in a meaningful order for stability purposes.

  13. def emptyEnv: TypeEnv
  14. def enabled: Boolean

    Is this component enabled? Default is true.

    Is this component enabled? Default is true.

    Definition Classes
    SubComponent
  15. def ensuring(cond: (SpecializeTypes) ⇒ Boolean, msg: ⇒ Any): SpecializeTypes
    Implicit
    This member is added by an implicit conversion from SpecializeTypes to Ensuring[SpecializeTypes] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  16. def ensuring(cond: (SpecializeTypes) ⇒ Boolean): SpecializeTypes
    Implicit
    This member is added by an implicit conversion from SpecializeTypes to Ensuring[SpecializeTypes] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  17. def ensuring(cond: Boolean, msg: ⇒ Any): SpecializeTypes
    Implicit
    This member is added by an implicit conversion from SpecializeTypes to Ensuring[SpecializeTypes] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  18. def ensuring(cond: Boolean): SpecializeTypes
    Implicit
    This member is added by an implicit conversion from SpecializeTypes to Ensuring[SpecializeTypes] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  19. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  20. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  21. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  22. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from SpecializeTypes to StringFormat[SpecializeTypes] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  23. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  24. def hasSpecializedParams(clazz: Global.Symbol): Boolean

    Has clazz any type parameters that need be specialized?

  25. 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
  26. def illegalSpecializedInheritance(clazz: Global.Symbol): Boolean
  27. 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
  28. 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
  29. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  30. def isNormalizedMember(m: Global.Symbol): Boolean
  31. def isSpecializedIn(sym: Global.Symbol, site: Global.Type): Boolean

    Refines possiblySpecialized taking into account the instantiation of the specialized type variables at site

  32. def keepsTypeParams: Boolean
    Definition Classes
    SpecializeTypes → InfoTransform
  33. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  34. def newPhase(prev: nsc.Phase): StdPhase

    Just to mark uncheckable

    Just to mark uncheckable

    Definition Classes
    SpecializeTypes → InfoTransform → Transform → SubComponent
  35. def newTransformer(unit: Global.CompilationUnit): Global.Transformer

    The transformer factory

    The transformer factory

    Attributes
    protected
    Definition Classes
    SpecializeTypes → Transform
  36. def nonConflicting(env: TypeEnv): Boolean

    Is any type variable in env conflicting with any if its type bounds, when type bindings in env are taken into account?

    Is any type variable in env conflicting with any if its type bounds, when type bindings in env are taken into account?

    A conflicting type environment could still be satisfiable.

  37. final def notify(): Unit
    Definition Classes
    AnyRef
  38. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  39. def originalClass(clazz: Global.Symbol): Global.Symbol

    Return the generic class corresponding to this specialized class.

  40. 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
  41. val phaseName: String

    the name of the phase:

    the name of the phase:

    Definition Classes
    SpecializeTypes → SubComponent
  42. def phaseNewFlags: Long

    The following flags may be set by this phase:

    The following flags may be set by this phase:

    Definition Classes
    SpecializeTypes → SubComponent
  43. 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
  44. def possiblySpecialized(sym: Global.Symbol): Boolean

    Is member potentially affected by specialization? This is a gross overapproximation, but it should be okay for use outside of specialization.

  45. def produceTypeParameters(syms: List[Global.Symbol], nowner: Global.Symbol, env: TypeEnv): collection.immutable.List[Global.Symbol]

    Produces the symbols from type parameters syms of the original owner, in the given type environment env.

    Produces the symbols from type parameters syms of the original owner, in the given type environment env. The new owner is nowner.

    Non-specialized type parameters are cloned into new ones. Type parameters specialized on AnyRef have preexisting symbols.

    For instance, a @specialized(AnyRef) T, will become T$sp <: AnyRef.

  46. val requires: List[String]

    Names of phases required by this component.

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

    Definition Classes
    SubComponent
  47. 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
  48. def satisfiabilityConstraints(env: TypeEnv): Option[TypeEnv]
  49. def satisfiable(env: TypeEnv, warnings: Boolean): Boolean
  50. def satisfiable(env: TypeEnv): Boolean

    The type environment is sound w.r.t.

    The type environment is sound w.r.t. to all type bounds or only soft conflicts appear. An environment is sound if all bindings are within the bounds of the given type variable. A soft conflict is a binding that does not fall within the bounds, but whose bounds contain type variables that are @specialized, (that could become satisfiable).

  51. lazy val specializableTypes: collection.immutable.List[Global.Type]
  52. def specializeCalls(unit: Global.CompilationUnit): TypingTransformer { ... /* 7 definitions in type refinement */ }
  53. def specializeClass(clazz: Global.Symbol, outerEnv: TypeEnv): List[Global.Symbol]

    Specialize 'clazz', in the environment outerEnv.

    Specialize 'clazz', in the environment outerEnv. The outer environment contains bindings for specialized types of enclosing classes.

    A class C is specialized w.r.t to its own specialized type params stps, by specializing its members, and creating a new class for each combination of stps.

  54. val specializedClass: HashMap[(Global.Symbol, TypeEnv), Global.Symbol]

    For a given class and concrete type arguments, give its specialized class

  55. def specializedFunctionName(sym: Global.Symbol, args: List[Global.Type]): reflect.internal.Symbols.Symbol.NameType
  56. def specializedParams(sym: Global.Symbol): List[Global.Symbol]

    Return specialized type parameters.

  57. val specializedType: Global.TypeMap
  58. def specializedTypeVars(tpe: Global.Type): Set[Global.Symbol]

    Return the set of @specialized type variables mentioned by the given type.

    Return the set of @specialized type variables mentioned by the given type. It only counts type variables that appear:

    • naked
    • as arguments to type constructors in @specialized positions (arrays are considered as Array[@specialized T])
  59. def specializedTypeVars(sym: Global.Symbol): Set[Global.Symbol]
  60. def specializedTypeVars(tpes: List[Global.Type]): Set[Global.Symbol]
  61. def specializedTypeVarsBuffer(tpe: Global.Type, result: Buffer[Global.Symbol]): Unit

    Return the set of @specialized type variables mentioned by the given type.

    Return the set of @specialized type variables mentioned by the given type. It only counts type variables that appear:

    • naked
    • as arguments to type constructors in @specialized positions (arrays are considered as Array[@specialized T])
  62. def specializedTypeVarsBuffer(sym: Global.Symbol, result: Buffer[Global.Symbol]): Unit
  63. def specializesClass(sym: Global.Symbol): Global.Symbol

    If the symbol is the companion of a value class, the value class.

    If the symbol is the companion of a value class, the value class. Otherwise, AnyRef.

  64. def survivingArgs(sym: Global.Symbol, args: List[Global.Type]): List[Global.Type]

    Given an original class symbol and a list of types its type parameters are instantiated at returns a list of type parameters that should remain in the TypeRef when instantiating a specialized type.

  65. def survivingParams(params: List[Global.Symbol], env: TypeEnv): collection.immutable.List[Global.Symbol]

    Type parameters that survive when specializing in the specified environment.

  66. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  67. 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
  68. def toString(): String
    Definition Classes
    AnyRef → Any
  69. def transformInfo(sym: Global.Symbol, tpe: Global.Type): Global.Type

    Type transformation.

    Type transformation. It is applied to all symbols, compiled or loaded. If it is a 'no-specialization' run, it is applied only to loaded symbols.

    Definition Classes
    SpecializeTypes → InfoTransform
  70. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  71. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  72. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  73. def →[B](y: B): (SpecializeTypes, B)
    Implicit
    This member is added by an implicit conversion from SpecializeTypes to ArrowAssoc[SpecializeTypes] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
  74. object SpecializedSuperConstructorCallArgument
  75. object TypeEnv
  76. object UnifyError extends Throwable with ControlThrowable with Product with Serializable

Inherited from TypingTransformers

Inherited from InfoTransform

Inherited from Transform

Inherited from SubComponent

Inherited from AnyRef

Inherited from Any

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

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

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

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

Ungrouped