dotty.tools.dotc.transform

ElimByName

Related Doc: package transform

class ElimByName extends MiniPhaseTransform with InfoTransformer

This phase eliminates ExprTypes => T as types of function parameters, and replaces them by nullary function types. More precisely:

For the types of parameter symbols:

> T

Note that => T types are not eliminated in MethodTypes. This is done later at erasure. Terms are rewritten as follows:

x ==> x.apply() if x is a parameter that had type => T

Arguments to call-by-name parameters are translated as follows. First, the argument is rewritten by the rules

e.apply() ==> e if e.apply() is an argument to a call-by-name parameter expr ==> () => expr if other expr is an argument to a call-by-name parameter

This makes the argument compatible with a parameter type of () => T, which will be the formal parameter type at erasure. But to be -Ycheckable until then, any argument ARG rewritten by the rules above is again wrapped in an application DummyApply(ARG) where

DummyApply: [T](() => T): T

is a synthetic method defined in Definitions. Erasure will later strip these DummyApply wrappers.

Note: This scheme to have inconsistent types between method types (whose formal types are still ExprTypes and parameter valdefs (which are now FunctionTypes) is not pretty. There are two other options which have been abandoned or not yet pursued.

Option 1: Transform => T to () => T also in method and function types. The problem with this is that is that it requires to look at every type, and this forces too much, causing Cyclic Reference errors. Abandoned for this reason.

Option 2: Merge ElimByName with erasure, or have it run immediately before. This has not been tried yet.

Self Type
ElimByName
Linear Supertypes
Ordering
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Inherited
  1. ElimByName
  2. InfoTransformer
  3. DenotTransformer
  4. MiniPhaseTransform
  5. MiniPhase
  6. Phase
  7. TreeTransform
  8. DotClass
  9. AnyRef
  10. Any
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  1. Public
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Instance Constructors

  1. new ElimByName()

Value Members

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

    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

    Definition Classes
    AnyRef → Any
  3. final def <=(that: Phase): Boolean

    Definition Classes
    Phase
  4. final def ==(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any
  5. final def asInstanceOf[T0]: T0

    Definition Classes
    Any
  6. def atGroupEnd[T](action: (Context) ⇒ T)(implicit ctx: Context, info: TransformerInfo): T

    Definition Classes
    TreeTransform
  7. def checkPostCondition(tree: ast.tpd.Tree)(implicit ctx: Context): Unit

    Check what the phase achieves, to be called at any point after it is finished.

    Check what the phase achieves, to be called at any point after it is finished.

    Definition Classes
    Phase
  8. def clone(): AnyRef

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  9. def description: String

    Definition Classes
    Phase
  10. def end: PhaseId

    Definition Classes
    Phase
  11. final def eq(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  12. def equals(arg0: Any): Boolean

    Definition Classes
    AnyRef → Any
  13. final def erasedTypes: Boolean

    Definition Classes
    Phase
  14. def exists: Boolean

    Definition Classes
    Phase
  15. def finalize(): Unit

    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  16. final def flatClasses: Boolean

    Definition Classes
    Phase
  17. final def getClass(): Class[_]

    Definition Classes
    AnyRef → Any
  18. final def hasNext: Boolean

    Definition Classes
    Phase
  19. def hashCode(): Int

    Definition Classes
    AnyRef → Any
  20. def id: Int

    The sequence position of this phase in the given context where 0 is reserved for NoPhase and the first real phase is at position 1.

    The sequence position of this phase in the given context where 0 is reserved for NoPhase and the first real phase is at position 1. -1 if the phase is not installed in the context.

    Definition Classes
    Phase
  21. var idx: Int

    id of this mini phase in group

    id of this mini phase in group

    Definition Classes
    MiniPhase
  22. def init(base: ContextBase, id: Int): Unit

    Attributes
    protected[dotty.tools.dotc.core.Phases]
    Definition Classes
    Phase
  23. def init(base: ContextBase, start: Int, end: Int): Unit

    Attributes
    protected[dotty.tools.dotc.core.Phases]
    Definition Classes
    Phase
  24. def isCheckable: Boolean

    Output should be checkable by TreeChecker

    Output should be checkable by TreeChecker

    Definition Classes
    Phase
  25. final def isInstanceOf[T0]: Boolean

    Definition Classes
    Any
  26. def isTyper: Boolean

    Is this phase the standard typerphase? True for FrontEnd, but not for other first phases (such as FromTasty).

    Is this phase the standard typerphase? True for FrontEnd, but not for other first phases (such as FromTasty). The predicate is tested in some places that perform checks and corrections. It's different from isAfterTyper (and cheaper to test).

    Definition Classes
    Phase
  27. final def iterator: Iterator[Phase]

    Definition Classes
    Phase
  28. final def labelsReordered: Boolean

    Definition Classes
    Phase
  29. def lastPhaseId(implicit ctx: Context): Int

    The last phase during which the transformed denotations are valid

    The last phase during which the transformed denotations are valid

    Definition Classes
    DenotTransformer
  30. def mayChange(sym: Symbol)(implicit ctx: Context): Boolean

    Denotations with a symbol where mayChange is false are guaranteed to be unaffected by this transform, so transformInfo need not be run.

    Denotations with a symbol where mayChange is false are guaranteed to be unaffected by this transform, so transformInfo need not be run. This can save time, and more importantly, can help avoid forcing symbol completers.

    Definition Classes
    ElimByNameInfoTransformer
  31. def mkTreeTransformer: TreeTransformer

    Attributes
    protected
    Definition Classes
    MiniPhase
  32. final def ne(arg0: AnyRef): Boolean

    Definition Classes
    AnyRef
  33. final def next: Phase

    Definition Classes
    Phase
  34. final def notify(): Unit

    Definition Classes
    AnyRef
  35. final def notifyAll(): Unit

    Definition Classes
    AnyRef
  36. def period: Period

    Definition Classes
    Phase
  37. def phase: MiniPhaseTransform

    Definition Classes
    MiniPhaseTransformTreeTransform
  38. def phaseName: String

    Definition Classes
    ElimByNamePhase
  39. def prepareForAlternative(tree: ast.tpd.Alternative)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  40. def prepareForApply(tree: ast.tpd.Apply)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  41. def prepareForAssign(tree: ast.tpd.Assign)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  42. def prepareForBind(tree: ast.tpd.Bind)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  43. def prepareForBlock(tree: ast.tpd.Block)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  44. def prepareForCaseDef(tree: ast.tpd.CaseDef)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  45. def prepareForClosure(tree: ast.tpd.Closure)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  46. def prepareForDefDef(tree: ast.tpd.DefDef)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  47. def prepareForIdent(tree: ast.tpd.Ident)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  48. def prepareForIf(tree: ast.tpd.If)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  49. def prepareForInlined(tree: ast.tpd.Inlined)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  50. def prepareForLiteral(tree: ast.tpd.Literal)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  51. def prepareForMatch(tree: ast.tpd.Match)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  52. def prepareForNew(tree: ast.tpd.New)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  53. def prepareForPackageDef(tree: ast.tpd.PackageDef)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  54. def prepareForReturn(tree: ast.tpd.Return)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  55. def prepareForSelect(tree: ast.tpd.Select)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  56. def prepareForSeqLiteral(tree: ast.tpd.SeqLiteral)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  57. def prepareForStats(trees: List[ast.tpd.Tree])(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  58. def prepareForSuper(tree: ast.tpd.Super)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  59. def prepareForTemplate(tree: ast.tpd.Template)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  60. def prepareForThis(tree: ast.tpd.This)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  61. def prepareForTry(tree: ast.tpd.Try)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  62. def prepareForTypeApply(tree: ast.tpd.TypeApply)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  63. def prepareForTypeDef(tree: ast.tpd.TypeDef)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  64. def prepareForTypeTree(tree: ast.tpd.TypeTree)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  65. def prepareForTyped(tree: ast.tpd.Typed)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  66. def prepareForUnApply(tree: ast.tpd.UnApply)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  67. def prepareForUnit(tree: ast.tpd.Tree)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  68. def prepareForValDef(tree: ast.tpd.ValDef)(implicit ctx: Context): TreeTransform

    Definition Classes
    TreeTransform
  69. final def prev: Phase

    Definition Classes
    Phase
  70. final def refChecked: Boolean

    Definition Classes
    Phase
  71. def relaxedTyping: Boolean

    If set, allow missing or superfluous arguments in applications and type applications.

    If set, allow missing or superfluous arguments in applications and type applications.

    Definition Classes
    Phase
  72. def run(implicit ctx: Context): Unit

    Definition Classes
    MiniPhasePhase
  73. def runOn(units: List[CompilationUnit])(implicit ctx: Context): List[CompilationUnit]

    Definition Classes
    Phase
  74. def runsAfter: Set[Class[_ <: Phase]]

    List of names of phases that should precede this phase

    List of names of phases that should precede this phase

    Definition Classes
    Phase
  75. def runsAfterGroupsOf: Set[Class[_ <: Phase]]

    List of names of phases that should have finished their processing of all compilation units before this phase starts

    List of names of phases that should have finished their processing of all compilation units before this phase starts

    Definition Classes
    ElimByNameMiniPhase
  76. def start: Int

    Definition Classes
    Phase
  77. final def symbolicRefs: Boolean

    Definition Classes
    Phase
  78. final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
    AnyRef
  79. def toString(): String

    Definition Classes
    Phase → AnyRef → Any
  80. def transform(ref: SingleDenotation)(implicit ctx: Context): SingleDenotation

    The transformation method

    The transformation method

    Definition Classes
    InfoTransformerDenotTransformer
  81. def transform(tree: ast.tpd.Tree)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Transform tree using all transforms of current group (including this one)

    Transform tree using all transforms of current group (including this one)

    Definition Classes
    TreeTransform
  82. def transformAlternative(tree: ast.tpd.Alternative)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  83. def transformApply(tree: ast.tpd.Apply)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    ElimByNameTreeTransform
  84. def transformAssign(tree: ast.tpd.Assign)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  85. def transformBind(tree: ast.tpd.Bind)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  86. def transformBlock(tree: ast.tpd.Block)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  87. def transformCaseDef(tree: ast.tpd.CaseDef)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  88. def transformClosure(tree: ast.tpd.Closure)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  89. def transformDefDef(tree: ast.tpd.DefDef)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  90. def transformFollowing(tree: ast.tpd.Tree)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Transform single node using all transforms following the current one in this group

    Transform single node using all transforms following the current one in this group

    Definition Classes
    TreeTransform
  91. def transformFollowingDeep(tree: ast.tpd.Tree)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Transform subtree using all transforms following the current one in this group

    Transform subtree using all transforms following the current one in this group

    Definition Classes
    TreeTransform
  92. def transformIdent(tree: ast.tpd.Ident)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    ElimByNameTreeTransform
  93. def transformIf(tree: ast.tpd.If)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  94. def transformInfo(tp: Type, sym: Symbol)(implicit ctx: Context): Type

    Definition Classes
    ElimByNameInfoTransformer
  95. def transformInlined(tree: ast.tpd.Inlined)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  96. def transformLiteral(tree: ast.tpd.Literal)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  97. def transformMatch(tree: ast.tpd.Match)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  98. def transformNew(tree: ast.tpd.New)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  99. def transformOther(tree: ast.tpd.Tree)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  100. def transformPackageDef(tree: ast.tpd.PackageDef)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  101. def transformReturn(tree: ast.tpd.Return)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  102. def transformSelect(tree: ast.tpd.Select)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  103. def transformSeqLiteral(tree: ast.tpd.SeqLiteral)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  104. def transformStats(trees: List[ast.tpd.Tree])(implicit ctx: Context, info: TransformerInfo): List[ast.tpd.Tree]

    Definition Classes
    TreeTransform
  105. def transformSuper(tree: ast.tpd.Super)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  106. def transformTemplate(tree: ast.tpd.Template)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  107. def transformThis(tree: ast.tpd.This)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  108. def transformTry(tree: ast.tpd.Try)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  109. def transformTypeApply(tree: ast.tpd.TypeApply)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    ElimByNameTreeTransform
  110. def transformTypeDef(tree: ast.tpd.TypeDef)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  111. def transformTypeTree(tree: ast.tpd.TypeTree)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  112. def transformTyped(tree: ast.tpd.Typed)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  113. def transformUnApply(tree: ast.tpd.UnApply)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  114. def transformUnit(tree: ast.tpd.Tree)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    TreeTransform
  115. def transformValDef(tree: ast.tpd.ValDef)(implicit ctx: Context, info: TransformerInfo): ast.tpd.Tree

    Definition Classes
    ElimByNameTreeTransform
  116. def treeTransform: MiniPhaseTransform

    Definition Classes
    MiniPhaseTransformMiniPhase
  117. def treeTransformPhase: Phase

    Definition Classes
    TreeTransform
  118. def unsupported(methodName: String): Nothing

    Throws an UnsupportedOperationException with the given method name.

    Throws an UnsupportedOperationException with the given method name.

    Definition Classes
    DotClass
  119. def validFor(implicit ctx: Context): Period

    The validity period of the transformer in the given context

    The validity period of the transformer in the given context

    Definition Classes
    DenotTransformer
  120. final def wait(): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  121. final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  122. final def wait(arg0: Long): Unit

    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from InfoTransformer

Inherited from DenotTransformer

Inherited from MiniPhaseTransform

Inherited from MiniPhase

Inherited from Phase

Inherited from TreeTransform

Inherited from DotClass

Inherited from AnyRef

Inherited from Any

Ungrouped