Scala Compiler2.12.3-1 < Back
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# Packages

-  package root

  The Scala compiler and reflection APIs.

  The Scala compiler and reflection APIs.

  Definition Classes
    root
-  package scala
  Definition Classes
    root
-  package tools
  Definition Classes
    scala
-  package nsc
  Definition Classes
    tools
-  package transform
  Definition Classes
    nsc
-  abstract class SpecializeTypes extends SubComponent with InfoTransform with TypingTransformers

  Specialize code on types.

  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.

  Definition Classes
    transform
- Abstract
- Duplicator
- Forward
- Implementation
- ImplementationAdapter
- NormalizedMember
- Overload
- Phase
- SpecialOverload
- SpecialOverride
- SpecialSuperAccessor
- SpecializationDuplicator
- SpecializationPhase
- SpecializationTransformer
- SpecializedAccessor
- SpecializedInfo
- SpecializedInnerClass
- SpecializedSuperConstructorCallArgument
- StdPhase
- TypeEnv
- TypingTransformer
- UnifyError

c

scala.tools.nsc.transform.SpecializeTypes

# SpecializationTransformer 

###

#### class SpecializationTransformer extends Global.Transformer

Source
  SpecializeTypes.scala

Linear Supertypes
Global.Transformer, Global.Transformer, AnyRef, Any
Type Hierarchy
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Ordering

1. Alphabetic
2. By Inheritance

Inherited

1. SpecializationTransformer
2. Transformer
3. Transformer
4. AnyRef
5. 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 SpecializationTransformer(unit: Global.CompilationUnit)

### 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 SpecializationTransformer to any2stringadd[SpecializationTransformer] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  def ->[B](y: B): (SpecializationTransformer, B)
   Implicit
     This member is added by an implicit conversion from SpecializationTransformer to ArrowAssoc[SpecializationTransformer] 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 asInstanceOf[T0]: T0
   Definition Classes
     Any
7.  def atOwner[A](owner: Global.Symbol)(trans: ⇒ A): A
   Definition Classes
     Transformer
8.  def clone(): AnyRef
   Attributes
     protected[java.lang]
   Definition Classes
     AnyRef
   Annotations
     @throws( ... )
9.  def currentClass: Global.Symbol
   Attributes
     protected
   Definition Classes
     Transformer
10.  def currentMethod: Global.Symbol
    Attributes
      protected
    Definition Classes
      Transformer
11.  var currentOwner: Global.Symbol
    Attributes
      protected[scala]
    Definition Classes
      Transformer
12.  def ensuring(cond: (SpecializationTransformer) ⇒ Boolean, msg: ⇒ Any): SpecializationTransformer
    Implicit
      This member is added by an implicit conversion from SpecializationTransformer to Ensuring[SpecializationTransformer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
13.  def ensuring(cond: (SpecializationTransformer) ⇒ Boolean): SpecializationTransformer
    Implicit
      This member is added by an implicit conversion from SpecializationTransformer to Ensuring[SpecializationTransformer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
14.  def ensuring(cond: Boolean, msg: ⇒ Any): SpecializationTransformer
    Implicit
      This member is added by an implicit conversion from SpecializationTransformer to Ensuring[SpecializationTransformer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
15.  def ensuring(cond: Boolean): SpecializationTransformer
    Implicit
      This member is added by an implicit conversion from SpecializationTransformer to Ensuring[SpecializationTransformer] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
16.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
17.  def equals(arg0: Any): Boolean
    Definition Classes
      AnyRef → Any
18.  def finalize(): Unit
    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )
19.  def formatted(fmtstr: String): String
    Implicit
      This member is added by an implicit conversion from SpecializationTransformer to StringFormat[SpecializationTransformer] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()
20.  final def getClass(): Class[_]
    Definition Classes
      AnyRef → Any
21.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
22.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
23.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
24.  final def notify(): Unit
    Definition Classes
      AnyRef
25.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
26.  final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
      AnyRef
27.  def toString(): String
    Definition Classes
      AnyRef → Any
28.  def transform(tree: Global.Tree): Global.Tree
    Definition Classes
      SpecializationTransformer → Transformer
29.  def transformCaseDefs(trees: List[Global.CaseDef]): List[Global.CaseDef]
    Definition Classes
      Transformer
30.  def transformIdents(trees: List[Global.Ident]): List[Global.Ident]
    Definition Classes
      Transformer
31.  def transformMemberDefs(trees: List[Global.MemberDef]): List[Global.MemberDef]
    Definition Classes
      Transformer
32.  def transformModifiers(mods: Global.Modifiers): Global.Modifiers
    Definition Classes
      Transformer
33.  def transformStats(stats: List[Global.Tree], exprOwner: Global.Symbol): List[Global.Tree]
    Definition Classes
      Transformer
34.  def transformTemplate(tree: Global.Template): Global.Template
    Definition Classes
      Transformer
35.  def transformTrees(trees: List[Global.Tree]): List[Global.Tree]
    Definition Classes
      Transformer
36.  def transformTypeDefs(trees: List[Global.TypeDef]): List[Global.TypeDef]
    Definition Classes
      Transformer
37.  def transformUnit(unit: Global.CompilationUnit): Unit
    Definition Classes
      Transformer
38.  def transformValDef(tree: Global.ValDef): Global.ValDef
    Definition Classes
      Transformer
39.  def transformValDefs(trees: List[Global.ValDef]): List[Global.ValDef]
    Definition Classes
      Transformer
40.  def transformValDefss(treess: List[List[Global.ValDef]]): List[List[Global.ValDef]]
    Definition Classes
      Transformer
41.  val treeCopy: Global.TreeCopier
    Definition Classes
      Transformer
42.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
43.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
44.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws( ... )
45.  def →[B](y: B): (SpecializationTransformer, B)
    Implicit
      This member is added by an implicit conversion from SpecializationTransformer to ArrowAssoc[SpecializationTransformer] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from Global.Transformer

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Ungrouped