scala.reflect.reify

# Phases

#### trait Phases extends Reshape with Calculate with Metalevels with Reify

Self Type
  Reifier

Linear Supertypes
Reify, GenUtils, GenPositions, GenAnnotationInfos, GenTrees, GenNames, GenTypes, GenSymbols, Metalevels, Calculate, Reshape, AnyRef, Any
Known Subclasses
Reifier
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1. Phases
2. Reify
3. GenUtils
4. GenPositions
5. GenAnnotationInfos
6. GenTrees
7. GenNames
8. GenTypes
9. GenSymbols
10. Metalevels
11. Calculate
12. Reshape
13. AnyRef
14. Any

Implicitly

1. by any2stringadd
2. by any2stringfmt
3. by any2ArrowAssoc
4. by any2Ensuring

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### Type Members

1. #### case class Reification (name: tools.nsc.Global.Name, binding: tools.nsc.Global.Tree, tree: tools.nsc.Global.Tree) extends Product with Serializable

   Definition Classes
     GenSymbols

2. #### implicit class RichCalculateSymbol extends AnyRef

   Definition Classes
     Calculate

3. #### implicit class RichCalculateType extends AnyRef

   Definition Classes
     Calculate

### Value Members

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

   Definition Classes
     AnyRef

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

   Definition Classes
     Any

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

   Definition Classes
     AnyRef → Any

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

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

5. #### def ->[B](y: B): (Phases, B)

   Implicit information
     This member is added by an implicit conversion from Phases to ArrowAssoc[Phases] performed by method any2ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()

6. #### final def ==(arg0: AnyRef): Boolean

   Definition Classes
     AnyRef

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

   Definition Classes
     Any

8. #### object TypedOrAnnotated

   Definition Classes
     GenUtils

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

   Definition Classes
     Any

10. #### def boundSymbolsInCallstack: List[tools.nsc.Global.Symbol]

    Definition Classes
      Reify

11. #### val calculate: tools.nsc.Global.Traverser { ... /* 2 definitions in type refinement */ }

    Merely traverses the reifiee and records local symbols along with their metalevels.

    Merely traverses the reifiee and records local symbols along with their metalevels.

    Definition Classes
      Calculate

12. #### def call(fname: String, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

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

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

14. #### def current: Any

    Definition Classes
      Reify

15. #### def currents: List[Any]

    Definition Classes
      Reify

16. #### def ensuring(cond: (Phases) ⇒ Boolean, msg: ⇒ Any): Phases

    Implicit information
      This member is added by an implicit conversion from Phases to Ensuring[Phases] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

17. #### def ensuring(cond: (Phases) ⇒ Boolean): Phases

    Implicit information
      This member is added by an implicit conversion from Phases to Ensuring[Phases] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

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

    Implicit information
      This member is added by an implicit conversion from Phases to Ensuring[Phases] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

19. #### def ensuring(cond: Boolean): Phases

    Implicit information
      This member is added by an implicit conversion from Phases to Ensuring[Phases] performed by method any2Ensuring in scala.Predef.
    Definition Classes
      Ensuring

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

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

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

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

    Implicit information
      This member is added by an implicit conversion from Phases to StringFormat performed by method any2stringfmt in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef → Any

26. #### def isAnnotated(tpe: tools.nsc.Global.Type): Boolean

    Definition Classes
      GenUtils

27. #### def isCrossStageTypeBearer(tree: tools.nsc.Global.Tree): Boolean

    Definition Classes
      GenUtils

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

    Definition Classes
      Any

29. #### def isSemiConcreteTypeMember(tpe: tools.nsc.Global.Type): Boolean

    Definition Classes
      GenUtils

30. #### def isTough(tpe: tools.nsc.Global.Type): Boolean

    Definition Classes
      GenUtils

31. #### val metalevels: tools.nsc.Global.Transformer { ... /* 5 definitions in type refinement */ }

    Makes sense of cross-stage bindings.

    Makes sense of cross-stage bindings.

    ######

    Analysis of cross-stage bindings becomes convenient if we introduce the notion of metalevels. Metalevel of a tree is a number that gets incremented every time you reify something and gets decremented when you splice something. Metalevel of a symbol is equal to the metalevel of its definition.

    Example 1. Consider the following snippet:

    reify { val x = 2 // metalevel of symbol x is 1, because it's declared inside reify val y = reify{x} // metalevel of symbol y is 1, because it's declared inside reify // metalevel of Ident(x) is 2, because it's inside two reifies y.splice // metalevel of Ident(y) is 0, because it's inside a designator of a splice }

    Cross-stage bindings are introduced when symbol.metalevel != curr_metalevel. Both bindings introduced in Example 1 are cross-stage.

    Depending on what side of the inequality is greater, the following situations might occur:

    1) symbol.metalevel < curr_metalevel. In this case reifier will generate a free variable that captures both the name of the symbol (to be compiled successfully) and its value (to be run successfully). For example, x in Example 1 will be reified as follows: Ident(newFreeVar("x", IntClass.tpe, x))

    2) symbol.metalevel > curr_metalevel. This leads to a metalevel breach that violates intuitive perception of splicing. As defined in macro spec, splicing takes a tree and inserts it into another tree - as simple as that. However, how exactly do we do that in the case of y.splice? In this very scenario we can use dataflow analysis and inline it, but what if y were a var, and what if it were calculated randomly at runtime?

    This question has a genuinely simple answer. Sure, we cannot resolve such splices statically (i.e. during macro expansion of ``reify), but now we have runtime toolboxes, so noone stops us from picking up that reified tree and evaluating it at runtime (in fact, this is something that ``Expr.splice does transparently).````

    This is akin to early vs late binding dilemma. The prior is faster, plus, the latter (implemented with reflection) might not work because of visibility issues or might be not available on all platforms. But the latter still has its uses, so I'm allowing metalevel breaches, but introducing the -Xlog-runtime-evals to log them.

    upd. We no longer do that. In case of a runaway ``splice inside a `reify`, one will get a static error. Why? Unfortunately, the cute idea of transparently converting between static and dynamic splices has failed. 1) Runtime eval that services dynamic splices requires scala-compiler.jar, which might not be on library classpath 2) Runtime eval incurs a severe performance penalty, so it'd better to be explicit about it``

    ######

    As we can see, the only problem is the fact that lhs'es of `splice` can be code blocks that can capture variables from the outside. Code inside the lhs of an `splice` is not reified, while the code from the enclosing reify is.

    Hence some bindings become cross-stage, which is not bad per se (in fact, some cross-stage bindings have sane semantics, as in the example above). However this affects freevars, since they are delicate inter-dimensional beings that refer to both current and next planes of existence. When splicing tears the fabric of the reality apart, some freevars have to go single-dimensional to retain their sanity.

    Example 2. Consider the following snippet:

    reify { val x = 2 reify{x}.splice }

    Since the result of the inner reify is wrapped in a splice, it won't be reified together with the other parts of the outer reify, but will be inserted into that result verbatim.

    The inner reify produces an Expr[Int] that wraps Ident(freeVar("x", IntClass.tpe, x)). However the freevar the reification points to will vanish when the compiler processes the outer reify. That's why we need to replace that freevar with a regular symbol that will point to reified x.

    Example 3. Consider the following fragment:

    reify { val x = 2 val y = reify{x} y.splice }

    In this case the inner reify doesn't appear next to splice, so it will be reified together with x. This means that no special processing is needed here.

    Example 4. Consider the following fragment:

    reify { val x = 2 { val y = 2 val z = reify{reify{x + y}} z.splice }.splice }

    The reasoning from Example 2 still holds here - we do need to inline the freevar that refers to x. However, we must not touch anything inside the splice'd block, because it's not getting reified.

    Definition Classes
      Metalevels

32. #### def mirrorBuildCall(name: String, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

33. #### def mirrorBuildCall(name: tools.nsc.Global.TermName, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

34. #### def mirrorBuildSelect(name: String): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

35. #### def mirrorCall(name: String, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

36. #### def mirrorCall(name: tools.nsc.Global.TermName, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

37. #### def mirrorFactoryCall(prefix: String, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

38. #### def mirrorFactoryCall(value: Product, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

39. #### def mirrorMirrorCall(name: String, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

40. #### def mirrorMirrorCall(name: tools.nsc.Global.TermName, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

41. #### def mirrorMirrorSelect(name: String): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

42. #### def mirrorSelect(name: String): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

43. #### def mkList(args: List[tools.nsc.Global.Tree]): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

44. #### def mkListMap(args: List[tools.nsc.Global.Tree]): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

45. #### lazy val mkReificationPipeline: (tools.nsc.Global.Tree) ⇒ tools.nsc.Global.Tree

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

49. #### def origin(sym: tools.nsc.Global.Symbol): String

    Definition Classes
      GenUtils

50. #### def path(fullname: String, mkName: (String) ⇒ tools.nsc.Global.Name): tools.nsc.Global.Tree

    An (unreified) path that refers to definition with given fully qualified name

    An (unreified) path that refers to definition with given fully qualified name

    mkName

      Creator for last portion of name (either TermName or TypeName)

    Definition Classes
      GenUtils

51. #### def reificationIsConcrete: Boolean

    Keeps track of whether this reification contains abstract type parameters

    Keeps track of whether this reification contains abstract type parameters

    Definition Classes
      GenTypes

52. #### def reify(reifee: Any): tools.nsc.Global.Tree

    Reifies any supported value.

    Reifies any supported value. For internal use only, use ``reified instead.``

    Definition Classes
      Reify

53. #### def reifyAnnotationInfo(ann: tools.nsc.Global.AnnotationInfo): tools.nsc.Global.Tree

    Definition Classes
      GenAnnotationInfos

54. #### def reifyFreeTerm(binding: tools.nsc.Global.Tree): tools.nsc.Global.Tree

    Definition Classes
      GenSymbols

55. #### def reifyFreeType(binding: tools.nsc.Global.Tree): tools.nsc.Global.Tree

    Definition Classes
      GenSymbols

56. #### def reifyList(xs: List[Any]): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

57. #### def reifyMirrorObject(x: Product): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

58. #### def reifyMirrorObject(name: String): tools.nsc.Global.Tree

    Reify a case object defined in Mirror

    Reify a case object defined in Mirror

    Definition Classes
      GenUtils

59. #### def reifyModifiers(m: tools.nsc.Global.Modifiers): tools.nsc.Global.Tree

    Definition Classes
      GenTrees

60. #### def reifyName(name: tools.nsc.Global.Name): tools.nsc.Global.Tree

    Definition Classes
      GenNames

61. #### def reifyPosition(pos: tools.nsc.Global.Position): tools.nsc.Global.Tree

    Definition Classes
      GenPositions

62. #### def reifyProduct(prefix: String, elements: List[Any]): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

63. #### def reifyProduct(x: Product): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

64. #### def reifySymDef(sym: tools.nsc.Global.Symbol): tools.nsc.Global.Tree

    Definition Classes
      GenSymbols

65. #### def reifySymRef(sym: tools.nsc.Global.Symbol): tools.nsc.Global.Tree

    Reify a reference to a symbol

    Reify a reference to a symbol

    Definition Classes
      GenSymbols

66. #### def reifyTree(tree: tools.nsc.Global.Tree): tools.nsc.Global.Tree

    Reify a tree.

    Reify a tree. For internal use only, use ``reified instead.``

    Definition Classes
      GenTrees

67. #### def reifyTreeSymbols: Boolean

    Definition Classes
      GenTrees

68. #### def reifyTreeTypes: Boolean

    Definition Classes
      GenTrees

69. #### def reifyType(tpe: tools.nsc.Global.Type): tools.nsc.Global.Tree

    Reify a type.

    Reify a type. For internal use only, use ``reified instead.``

    Definition Classes
      GenTypes

70. #### val reshape: tools.nsc.Global.Transformer { ... /* 2 definitions in type refinement */ }

    Rolls back certain changes that were introduced during typechecking of the reifee.

    Rolls back certain changes that were introduced during typechecking of the reifee.

    These include: * Undoing macro expansions * Replacing type trees with TypeTree(tpe) * Reassembling CompoundTypeTrees into reifiable form * Transforming Modifiers.annotations into Symbol.annotations * Transforming Annotated annotations into AnnotatedType annotations * Transforming Annotated(annot, expr) into Typed(expr, TypeTree(Annotated(annot, _)) * Non-idempotencies of the typechecker: https://issues.scala-lang.org/browse/SI-5464

    Definition Classes
      Reshape

71. #### def scalaFactoryCall(name: String, args: tools.nsc.Global.Tree*): tools.nsc.Global.Tree

    Definition Classes
      GenUtils

72. #### def spliceType(tpe: tools.nsc.Global.Type): tools.nsc.Global.Tree

    Definition Classes
      GenTypes

73. #### def symtab: Reifier.SymbolTable

    Symbol table of the reifee.

    Symbol table of the reifee.

    Keeps track of auxiliary symbols that are necessary for this reification session. These include: 1) Free vars (terms, types and existentials), 2) Non-locatable symbols (sometimes, e.g. for RefinedTypes, we need to reify these; to do that we create their local copies in the reificode) 3) Non-locatable symbols that are referred by #1, #2 and #3

    Exposes three main methods: 1) `syms` that lists symbols belonging to the table, 2) `symXXX` family of methods that provide information about the symbols in the table, 3) `encode` that renders the table into a list of trees (recursively populating #3 and setting up initialization code for #1, #2 and #3)

    Definition Classes
      GenSymbols

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

    Definition Classes
      AnyRef

75. #### def termPath(fullname: String): tools.nsc.Global.Tree

    An (unreified) path that refers to term definition with given fully qualified name

    An (unreified) path that refers to term definition with given fully qualified name

    Definition Classes
      GenUtils

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

    Definition Classes
      AnyRef → Any

77. #### def typePath(fullname: String): tools.nsc.Global.Tree

    An (unreified) path that refers to type definition with given fully qualified name

    An (unreified) path that refers to type definition with given fully qualified name

    Definition Classes
      GenUtils

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

81. #### def →[B](y: B): (Phases, B)

    Implicit information
      This member is added by an implicit conversion from Phases to ArrowAssoc[Phases] performed by method any2ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Shadowed Implicit Value Members

1. #### val self: Any

   Implicit information
     This member is added by an implicit conversion from Phases to StringAdd performed by method any2stringadd in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (phases: StringAdd).self

   Definition Classes
     StringAdd

2. #### val self: Any

   Implicit information
     This member is added by an implicit conversion from Phases to StringFormat performed by method any2stringfmt in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (phases: StringFormat).self

   Definition Classes
     StringFormat

### Deprecated Value Members

1. #### def x: Phases

   Implicit information
     This member is added by an implicit conversion from Phases to ArrowAssoc[Phases] performed by method any2ArrowAssoc in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (phases: ArrowAssoc[Phases]).x

   Definition Classes
     ArrowAssoc
   Annotations
     @deprecated
   Deprecated

     (Since version 2.10.0) Use `leftOfArrow`instead``

2. #### def x: Phases

   Implicit information
     This member is added by an implicit conversion from Phases to Ensuring[Phases] performed by method any2Ensuring in scala.Predef.
   Shadowing
     This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
     To access this member you can use a type ascription:

         (phases: Ensuring[Phases]).x

   Definition Classes
     Ensuring
   Annotations
     @deprecated
   Deprecated

     (Since version 2.10.0) Use `resultOfEnsuring`instead``

### Inherited from Reify

### Inherited from GenUtils

### Inherited from GenPositions

### Inherited from GenAnnotationInfos

### Inherited from GenTrees

### Inherited from GenNames

### Inherited from GenTypes

### Inherited from GenSymbols

### Inherited from Metalevels

### Inherited from Calculate

### Inherited from Reshape

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from Phases to StringAdd

### Inherited by implicit conversion any2stringfmt from Phases to StringFormat

### Inherited by implicit conversion any2ArrowAssoc from Phases to ArrowAssoc[Phases]

### Inherited by implicit conversion any2Ensuring from Phases to Ensuring[Phases]

### Ungrouped