scala.tools.nsc.backend.jvm.BTypes

# ClassBType

#### final class ClassBType extends RefBType

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.

Source
  BTypes.scala

Linear Supertypes
RefBType, BType, AnyRef, Any
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Inherited

1. ClassBType
2. RefBType
3. BType
4. AnyRef
5. Any

Implicitly

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

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### Instance Constructors

1. #### new ClassBType(offset: Int, length: Int)

### 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 ClassBType to any2stringadd[ClassBType] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

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

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

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

   Definition Classes
     AnyRef → Any

6. #### def asArrayBType: ArrayBType

   Definition Classes
     BType

7. #### def asClassBType: ClassBType

   Definition Classes
     BType

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

   Definition Classes
     Any

9. #### def asPrimitiveBType: PrimitiveBType

   Definition Classes
     BType

10. #### def asRefBType: RefBType

    Definition Classes
      BType

11. #### def classOrArrayType: String

    The class or array type of this reference type.

    The class or array type of this reference type. Used for ANEWARRAY, MULTIANEWARRAY, INSTANCEOF and CHECKCAST instructions. Also used for emitting invokevirtual calls to (a: Array[T]).clone() for any T, see genApply.

    In contrast to the descriptor, this string does not contain the surrounding 'L' and ';' for class types, for example "java/lang/String". However, for array types, the full descriptor is used, for example "[Ljava/lang/String;".

    This can be verified for example using javap or ASMifier.

    Definition Classes
      RefBType

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

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

13. #### final def conformsTo(other: BType): Boolean

    Definition Classes
      BType

14. #### final def descriptor: String

    returns

      The Java descriptor of this type. Examples:

      - int: I
      - java.lang.String: Ljava/lang/String;
      - int[]: [I
      - Object m(String s, double d): (Ljava/lang/String;D)Ljava/lang/Object;
    Definition Classes
      BType

15. #### def enclosingNestedClassesChain: List[ClassBType]

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

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

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

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

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

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

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

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

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

    Definition Classes
      AnyRef

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

    Custom equals / hashCode: we only compare the name (offset / length)

    Custom equals / hashCode: we only compare the name (offset / length)

    Definition Classes
      ClassBType → 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 ClassBType to StringFormat[ClassBType] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      ClassBType → AnyRef → Any

26. #### def info: ClassInfo

27. #### def info_=(i: ClassInfo): Unit

28. #### def innerClassAttributeEntry: Option[InnerClassEntry]

29. #### def internalName: String

    The internal name of a class is the string returned by java.lang.Class.getName, with all '.' replaced by '/'.

    The internal name of a class is the string returned by java.lang.Class.getName, with all '.' replaced by '/'. For example "java/lang/String".

30. #### final def isArray: Boolean

    Definition Classes
      BType

31. #### final def isBoxed: Boolean

    Definition Classes
      BType

32. #### final def isClass: Boolean

    Definition Classes
      BType

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

    Definition Classes
      Any

34. #### final def isIntSizedType: Boolean

    Definition Classes
      BType

35. #### final def isIntegralType: Boolean

    Definition Classes
      BType

36. #### def isInterface: Boolean

37. #### final def isMethod: Boolean

    Definition Classes
      BType

38. #### def isNestedClass: Boolean

39. #### final def isNonVoidPrimitiveType: Boolean

    Definition Classes
      BType

40. #### final def isNothingType: Boolean

    Definition Classes
      BType

41. #### final def isNullType: Boolean

    Definition Classes
      BType

42. #### final def isNumericType: Boolean

    Definition Classes
      BType

43. #### final def isPrimitive: Boolean

    Definition Classes
      BType

44. #### final def isRealType: Boolean

    Definition Classes
      BType

45. #### final def isRef: Boolean

    Definition Classes
      BType

46. #### def isSubtypeOf(other: ClassBType): Boolean

47. #### final def isWideType: Boolean

    Definition Classes
      BType

48. #### def jvmWiseLUB(other: ClassBType): ClassBType

    Finding the least upper bound in agreement with the bytecode verifier Background: http://gallium.inria.fr/~xleroy/publi/bytecode-verification-JAR.pdf http://comments.gmane.org/gmane.comp.java.vm.languages/2293 https://issues.scala-lang.org/browse/SI-3872

49. #### val length: Int

50. #### final def maxType(other: BType): BType

    Compute the upper bound of two types.

    Compute the upper bound of two types. Takes promotions of numeric primitives into account.

    Definition Classes
      BType

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

54. #### val offset: Int

55. #### def simpleName: String

    returns

      The class name without the package prefix

56. #### final def size: Int

    returns

      0 for void, 2 for long and double, 1 otherwise

    Definition Classes
      BType

57. #### def superClassesTransitive: List[ClassBType]

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

    Definition Classes
      AnyRef

59. #### def toASMType: Type

    The asm.Type corresponding to this BType.

    The asm.Type corresponding to this BType.

    Note about asm.Type.getObjectType (*): For class types, the method expects the internal name, i.e. without the surrounding 'L' and ';'. For array types on the other hand, the method expects a full descriptor, for example "[Ljava/lang/String;".

    See method asm.Type.getType that creates a asm.Type from a type descriptor

    - for an OBJECT type, the 'L' and ';' are not part of the range of the created Type
    - for an ARRAY type, the full descriptor is part of the range
    Definition Classes
      BType

60. #### final def toString(): String

    Definition Classes
      BType → AnyRef → Any

61. #### final def typedOpcode(opcode: Int): Int

    Some JVM opcodes have typed variants.

    Some JVM opcodes have typed variants. This method returns the correct opcode according to the type.

    opcode

      A JVM instruction opcode. This opcode must be one of ILOAD, ISTORE, IALOAD, IASTORE, IADD, ISUB, IMUL, IDIV, IREM, INEG, ISHL, ISHR, IUSHR, IAND, IOR IXOR and IRETURN.

    returns

      The opcode adapted to this java type. For example, if this type is `float` and `opcode` is `IRETURN`, this method returns `FRETURN`.

    Definition Classes
      BType

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

65. #### def →[B](y: B): (ClassBType, B)

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

### Inherited from RefBType

### Inherited from BType

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Ungrouped