scala.tools.nsc.backend.jvm

# BTypesFromSymbols

#### class BTypesFromSymbols[G <: Global] extends BTypes

This class mainly contains the method classBTypeFromSymbol, which extracts the necessary information from a symbol and its type to create the correpsonding ClassBType. It requires access to the compiler (global parameter).

The mixin CoreBTypes defines core BTypes that are used in the backend. Building these BTypes uses classBTypeFromSymbol, hence requires access to the compiler (global).

BTypesFromSymbols extends BTypes because the implementation of BTypes requires access to some of the core btypes. They are declared in BTypes as abstract members. Note that BTypes does not have access to the compiler instance.

Source
  BTypesFromSymbols.scala

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BTypes, AnyRef, Any
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1. BTypesFromSymbols
2. BTypes
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 BTypesFromSymbols(global: G)

### Type Members

1. #### case class ArrayBType(componentType: BType) extends RefBType with Product with Serializable

   Definition Classes
     BTypes

2. #### trait BType extends AnyRef

   A BType is either a primitve type, a ClassBType, an ArrayBType of one of these, or a MethodType referring to BTypes.

   A BType is either a primitve type, a ClassBType, an ArrayBType of one of these, or a MethodType referring to BTypes.

   Definition Classes
     BTypes

3. #### final class ClassBType extends RefBType

   A ClassBType represents a class or interface type.

   A ClassBType represents a class or interface type. The necessary information to build a ClassBType is extracted from compiler symbols and types, see BTypesFromSymbols.

   The `offset` and `length` fields are used to represent the internal name of the class. They are indices into some character array. The internal name can be obtained through the method `internalNameString`, which is abstract in this component. Name creation is assumed to be hash-consed, so if two ClassBTypes have the same internal name, they NEED to have the same `offset` and `length`.

   The actual implementation in subclass BTypesFromSymbols uses the global `chrs` array from the name table. This representation is efficient because the JVM class name is obtained through `classSymbol.javaBinaryName`. This already adds the necessary string to the `chrs` array, so it makes sense to reuse the same name table in the backend.

   ClassBType is not a case class because we want a custom equals method, and because the extractor extracts the internalName, which is what you typically need.

   Definition Classes
     BTypes

4. #### case class ClassInfo(superClass: Option[ClassBType], interfaces: List[ClassBType], flags: Int, memberClasses: List[ClassBType], nestedInfo: Option[NestedInfo]) extends Product with Serializable

   The type info for a class.

   The type info for a class. Used for symboltable-independent subtype checks in the backend.

   superClass

     The super class, not defined for class java/lang/Object.

   interfaces

     All transitively implemented interfaces, except for those inherited through the superclass.

   flags

     The java flags, obtained through `javaFlags`. Used also to derive the flags for InnerClass entries.

   memberClasses

     Classes nested in this class. Those need to be added to the InnerClass table, see the InnerClass spec summary above.

   nestedInfo

     If this describes a nested class, information for the InnerClass table.

   Definition Classes
     BTypes

5. #### case class InnerClassEntry(name: String, outerName: String, innerName: String, flags: Int) extends Product with Serializable

   This class holds the data for an entry in the InnerClass table.

   This class holds the data for an entry in the InnerClass table. See the InnerClass summary above in this file.

   There's some overlap with the class NestedInfo, but it's not exactly the same and cleaner to keep separate.

   name

     The internal name of the class.

   outerName

     The internal name of the outer class, may be null.

   innerName

     The simple name of the inner class, may be null.

   flags

     The flags for this class in the InnerClass entry.

   Definition Classes
     BTypes

6. #### case class MethodBType(argumentTypes: List[BType], returnType: BType) extends BType with Product with Serializable

   Definition Classes
     BTypes

7. #### final case class MethodNameAndType(name: String, methodType: MethodBType) extends Product with Serializable

   Just a named pair, used in CoreBTypes.asmBoxTo/asmUnboxTo.

   Just a named pair, used in CoreBTypes.asmBoxTo/asmUnboxTo.

   Definition Classes
     BTypes

8. #### case class NestedInfo(enclosingClass: ClassBType, outerName: Option[String], innerName: Option[String], isStaticNestedClass: Boolean) extends Product with Serializable

   Information required to add a class to an InnerClass table.

   Information required to add a class to an InnerClass table. The spec summary above explains what information is required for the InnerClass entry.

   enclosingClass

     The enclosing class, if it is also nested. When adding a class to the InnerClass table, enclosing nested classes are also added.

   outerName

     The outerName field in the InnerClass entry, may be None.

   innerName

     The innerName field, may be None.

   isStaticNestedClass

     True if this is a static nested class (not inner class) (*)

     (*) Note that the STATIC flag in ClassInfo.flags, obtained through javaFlags(classSym), is not correct for the InnerClass entry, see javaFlags. The static flag in the InnerClass describes a source-level propety: if the class is in a static context (does not have an outer pointer). This is checked when building the NestedInfo.

   Definition Classes
     BTypes

9. #### sealed trait PrimitiveBType extends BType

   Definition Classes
     BTypes

10. #### sealed trait RefBType extends BType

    Definition Classes
      BTypes

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

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

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

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

   Definition Classes
     AnyRef → Any

6. #### object BOOL extends PrimitiveBType with Product with Serializable

   Definition Classes
     BTypes

7. #### object BYTE extends PrimitiveBType with Product with Serializable

   Definition Classes
     BTypes

8. #### object CHAR extends PrimitiveBType with Product with Serializable

   Definition Classes
     BTypes

9. #### object ClassBType

   Definition Classes
     BTypes

10. #### object DOUBLE extends PrimitiveBType with Product with Serializable

    Definition Classes
      BTypes

11. #### object FLOAT extends PrimitiveBType with Product with Serializable

    Definition Classes
      BTypes

12. #### object INT extends PrimitiveBType with Product with Serializable

    Definition Classes
      BTypes

13. #### object LONG extends PrimitiveBType with Product with Serializable

    Definition Classes
      BTypes

14. #### object SHORT extends PrimitiveBType with Product with Serializable

    Definition Classes
      BTypes

15. #### object UNIT extends PrimitiveBType with Product with Serializable

    Definition Classes
      BTypes

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

    Definition Classes
      Any

17. #### val bCodeAsmCommon: BCodeAsmCommon[global.type]

18. #### val bCodeICodeCommon: BCodeICodeCommon[global.type]

19. #### def classBTypeFromInternalName(internalName: String): ClassBType

    Obtain a previously constructed ClassBType for a given internal name.

    Obtain a previously constructed ClassBType for a given internal name.

    Definition Classes
      BTypes

20. #### val classBTypeFromInternalNameMap: TrieMap[String, ClassBType]

    A map from internal names to ClassBTypes.

    A map from internal names to ClassBTypes. Every ClassBType is added to this map on its construction.

    This map is used when computing stack map frames. The asm.ClassWriter invokes the method `getCommonSuperClass`. In this method we need to obtain the ClassBType for a given internal name. The method assumes that every class type that appears in the bytecode exists in the map.

    Concurrent because stack map frames are computed when in the class writer, which might run on multiple classes concurrently.

    Attributes
      protected
    Definition Classes
      BTypesFromSymbols → BTypes

21. #### final def classBTypeFromSymbol(classSym: G.Symbol): ClassBType

    The ClassBType for a class symbol `sym`.

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

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

23. #### val coreBTypes: CoreBTypesProxy[BTypesFromSymbols.this.type]

    Definition Classes
      BTypesFromSymbols → BTypes

24. #### def ensuring(cond: (BTypesFromSymbols[G]) ⇒ Boolean, msg: ⇒ Any): BTypesFromSymbols[G]

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

25. #### def ensuring(cond: (BTypesFromSymbols[G]) ⇒ Boolean): BTypesFromSymbols[G]

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

26. #### def ensuring(cond: Boolean, msg: ⇒ Any): BTypesFromSymbols[G]

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

27. #### def ensuring(cond: Boolean): BTypesFromSymbols[G]

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

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

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

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

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

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

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

    Definition Classes
      AnyRef → Any

33. #### val global: G

34. #### final def hasPublicBitSet(flags: Int): Boolean

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

    Definition Classes
      AnyRef → Any

36. #### def internalNameString(offset: Int, length: Int): String

    The string represented by the `offset` / `length` values of a ClassBType, see comment of that class.

    The string represented by the `offset` / `length` values of a ClassBType, see comment of that class.

    Definition Classes
      BTypesFromSymbols → BTypes

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

38. #### def isCompilingArray: Boolean

39. #### def isCompilingPrimitive: Boolean

    True if the current compilation unit is of a primitive class (scala.Boolean et al).

    True if the current compilation unit is of a primitive class (scala.Boolean et al). Used only in assertions.

    Definition Classes
      BTypesFromSymbols → BTypes

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

    Definition Classes
      Any

41. #### final def isRemote(s: G.Symbol): Boolean

42. #### final def isStaticModuleClass(sym: G.Symbol): Boolean

    True for module classes of modules that are top-level or owned only by objects.

    True for module classes of modules that are top-level or owned only by objects. Module classes for such objects will get a MODULE$ flag and a corresponding static initializer.

43. #### final def isTopLevelModuleClass(sym: G.Symbol): Boolean

    True for module classes of package level objects.

    True for module classes of package level objects. The backend will generate a mirror class for such objects.

44. #### def javaFieldFlags(sym: G.Symbol): Int

45. #### final def javaFlags(sym: G.Symbol): Int

    Return the Java modifiers for the given symbol.

    Return the Java modifiers for the given symbol. Java modifiers for classes:

    - public, abstract, final, strictfp (not used) for interfaces:
    - the same as for classes, without 'final' for fields:
    - public, private (*)
    - static, final for methods:
    - the same as for fields, plus:
    - abstract, synchronized (not used), strictfp (not used), native (not used) for all:
    - deprecated

    (*) protected cannot be used, since inner classes 'see' protected members, and they would fail verification after lifted.

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. #### final val strMODULE_INSTANCE_FIELD: String

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

55. #### def →[B](y: B): (BTypesFromSymbols[G], B)

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

### Inherited from BTypes

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from BTypesFromSymbols[G] to any2stringadd[BTypesFromSymbols[G]]

### Inherited by implicit conversion StringFormat from BTypesFromSymbols[G] to StringFormat[BTypesFromSymbols[G]]

### Inherited by implicit conversion Ensuring from BTypesFromSymbols[G] to Ensuring[BTypesFromSymbols[G]]

### Inherited by implicit conversion ArrowAssoc from BTypesFromSymbols[G] to ArrowAssoc[BTypesFromSymbols[G]]

### Ungrouped