scala.tools.nsc.backend.opt

# Inliners

###
Related Doc: package opt

#### abstract class Inliners extends SubComponent

Inliner balances two competing goals: (a) aggressive inlining of: (a.1) the apply methods of anonymous closures, so that their anon-classes can be eliminated; (a.2) higher-order-methods defined in an external library, e.g. `Range.foreach()` among many others. (b) circumventing the barrier to inter-library inlining that private accesses in the callee impose.

Summing up the discussion in SI-5442 and SI-5891, the current implementation achieves to a large degree both goals above, and overcomes a problem exhibited by previous versions:

(1) Problem: Attempting to access a private member `p` at runtime resulting in an `IllegalAccessError`, where `p` is defined in a library L, and is accessed from a library C (for Client), where C was compiled against L', an optimized version of L where the inliner made `p` public at the bytecode level. The only such members are fields, either synthetic or isParamAccessor, and thus having a dollar sign in their name (the accessibility of methods and constructors isn't touched by the inliner).

Thus we add one more goal to our list: (c) Compile C (either optimized or not) against any of L or L', so that it runs with either L or L' (in particular, compile against L' and run with L).

The chosen strategy is described in some detail in the comments for `accessRequirements()` and `potentiallyPublicized()`. Documentation at http://lamp.epfl.ch/~magarcia/ScalaCompilerCornerReloaded/2011Q4/Inliner.pdf

Source
  Inliners.scala

Linear Supertypes
SubComponent, AnyRef, Any
Known Subclasses
inliner
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Inherited

1. Inliners
2. SubComponent
3. AnyRef
4. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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### Instance Constructors

1. #### new Inliners()

### Type Members

1. #### class Inliner extends AnyRef

   Simple inliner.

2. #### class InliningPhase extends Global.icodes.ICodePhase

   The Inlining phase.

3. #### abstract class StdPhase extends GlobalPhase

   A standard phase template

   A standard phase template

   Definition Classes
     SubComponent

### 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

   Test two objects for inequality.

   Test two objects for inequality.

   returns

     `true` if !(this == that), false otherwise.

   Definition Classes
     AnyRef → Any

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

   Equivalent to `x.hashCode` except for boxed numeric types and `null`.

   Equivalent to `x.hashCode` except for boxed numeric types and `null`. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For `null` returns a hashcode where `null.hashCode` throws a `NullPointerException`.

   returns

     a hash value consistent with ==

   Definition Classes
     AnyRef → Any

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

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

4. #### def ->[B](y: B): (Inliners, B)

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

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

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   The expression `x == that` is equivalent to `if (x eq null) that eq null else x.equals(that)`.

   arg0

     the object to compare against this object for equality.

   returns

     `true` if the receiver object is equivalent to the argument; `false` otherwise.

   Definition Classes
     AnyRef → Any

6. #### final val MAX_INLINE_RETRY: Int(15)

   Maximum loop iterations.

7. #### final val MAX_INLINE_SIZE: Int(16)

   The maximum size in basic blocks of methods considered for inlining.

8. #### val SMALL_METHOD_SIZE: Int

   Small method size (in blocks)

9. #### final def afterOwnPhase[T](op: ⇒ T): T

   Definition Classes
     SubComponent
   Annotations
     @inline()

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

    Cast the receiver object to be of type `T0`.

    Cast the receiver object to be of type `T0`.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression `1.asInstanceOf[String]` will throw a `ClassCastException` at runtime, while the expression `List(1).asInstanceOf[List[String]]` will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

      the receiver object.

    Definition Classes
      Any
    Exceptions thrown

      `ClassCastException` if the receiver object is not an instance of the erasure of type `T0`.

11. #### final def beforeOwnPhase[T](op: ⇒ T): T

    Definition Classes
      SubComponent
    Annotations
      @inline()

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

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the `clone` method is platform dependent.

    returns

      a copy of the receiver object.

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

      not specified by SLS as a member of AnyRef

13. #### val enabled: Boolean

    Is this component enabled? Default is true.

    Is this component enabled? Default is true.

    Definition Classes
      Inliners → SubComponent

14. #### def ensuring(cond: (Inliners) ⇒ Boolean, msg: ⇒ Any): Inliners

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

15. #### def ensuring(cond: (Inliners) ⇒ Boolean): Inliners

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

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

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

17. #### def ensuring(cond: Boolean): Inliners

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

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

    Tests whether the argument (`arg0`) is a reference to the receiver object (`this`).

    Tests whether the argument (`arg0`) is a reference to the receiver object (`this`).

    The `eq` method implements an equivalence relation on non-null instances of `AnyRef`, and has three additional properties:

    - It is consistent: for any non-null instances `x` and `y` of type `AnyRef`, multiple invocations of `x.eq(y)` consistently returns `true` or consistently returns `false`.
    - For any non-null instance `x` of type `AnyRef`, `x.eq(null)` and `null.eq(x)` returns `false`.
    - `null.eq(null)` returns `true`.

    When overriding the `equals` or `hashCode` methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (`o1 eq o2`), they should be equal to each other (`o1 == o2`) and they should hash to the same value (`o1.hashCode == o2.hashCode`).

    returns

      `true` if the argument is a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef

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

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to `eq`.

    See also `equals` in scala.Any.

    returns

      `true` if the receiver object is equivalent to the argument; `false` otherwise.

    Definition Classes
      AnyRef → Any

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

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the `finalize` method is invoked, as well as the interaction between `finalize` and non-local returns and exceptions, are all platform dependent.

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

      not specified by SLS as a member of AnyRef

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

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

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

    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

      a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
      AnyRef → Any
    Note

      not specified by SLS as a member of AnyRef

23. #### def hasInline(sym: Global.Symbol): Boolean

24. #### def hasNoInline(sym: Global.Symbol): Boolean

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

    returns

      the hash code value for this object.

    Definition Classes
      SubComponent → AnyRef → Any

26. #### 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

27. #### 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

28. #### def isBottomType(sym: Global.Symbol): Boolean

29. #### def isClosureClass(cls: Global.Symbol): Boolean

    Is the given class a closure?

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

    Test whether the dynamic type of the receiver object is `T0`.

    Test whether the dynamic type of the receiver object is `T0`.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression `1.isInstanceOf[String]` will return `false`, while the expression `List(1).isInstanceOf[List[String]]` will return `true`. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

      `true` if the receiver object is an instance of erasure of type `T0`; `false` otherwise.

    Definition Classes
      Any

31. #### def isMonadicMethod(sym: Global.Symbol): Boolean

32. #### val knownHasInline: Set[Global.Symbol]

33. #### val knownLacksInline: Set[Global.Symbol]

34. #### def lookupImplFor(sym: Global.Symbol, clazz: Global.Symbol): Global.Symbol

    Look up implementation of method 'sym in 'clazz'.

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

    Equivalent to `!(this eq that)`.

    Equivalent to `!(this eq that)`.

    returns

      `true` if the argument is not a reference to the receiver object; `false` otherwise.

    Definition Classes
      AnyRef

36. #### def newPhase(p: Phase): InliningPhase

    Create a new phase

    Create a new phase

    Definition Classes
      Inliners → SubComponent

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

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

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

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
      AnyRef
    Note

      not specified by SLS as a member of AnyRef

39. #### def ownPhase: 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

40. #### val phaseName: String

    The name of the phase

    The name of the phase

    Definition Classes
      Inliners → SubComponent

41. #### 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

42. #### 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

43. #### val requires: List[String]

    Names of phases required by this component.

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

    Definition Classes
      SubComponent

44. #### 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

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

    Definition Classes
      AnyRef

46. #### 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

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

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

      a String representation of the object.

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

51. #### def →[B](y: B): (Inliners, B)

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

### Inherited from SubComponent

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Ungrouped