Scala Compiler2.13.17 < Back


# Packages

-  package root

  The Scala compiler and reflection APIs.

  The Scala compiler and reflection APIs.

  Definition Classes
    root
-  package scala
  Definition Classes
    root
-  package tools
  Definition Classes
    scala
-  package nsc
  Definition Classes
    tools
-  package backend
  Definition Classes
    nsc
-  package jvm
  Definition Classes
    backend
-  abstract class BTypes extends AnyRef

  The BTypes component defines The BType class hierarchy.

  The BTypes component defines The BType class hierarchy. A BType stores all type information that is required after building the ASM nodes. This includes optimizations, generation of InnerClass attributes and generation of stack map frames.

  The representation is immutable and independent of the compiler data structures, hence it can be queried by concurrent threads.

  Definition Classes
    jvm
- ArrayBType
- BOOL
- BType
- BTypeExporter
- BYTE
- CHAR
- ClassBType
- ClassInfo
- DOUBLE
- FLOAT
- INT
- InnerClassEntry
- LONG
- Lazy
- LazyVar
- MethodBType
- MethodNameAndType
- NestedInfo
- PrimitiveBType
- RefBType
- SHORT
- UNIT

c

scala.tools.nsc.backend.jvm.BTypes

# ClassBType

###
Companion object ClassBType

#### sealed abstract 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 `info` field contains either the class information on an error message why the info could not be computed. There are two reasons for an erroneous info:

1. The ClassBType was built from a class symbol that stems from a java source file, and the symbol's type could not be completed successfully (scala/bug#9111) 2. The ClassBType should be built from a classfile, but the class could not be found on the compilation classpath.

Note that all ClassBTypes required in a non-optimized run are built during code generation from the class symbols referenced by the ASTs, so they have a valid info. Therefore the backend often invokes `info.get` (which asserts the info to exist) when reading data from the ClassBType.

The inliner on the other hand uses ClassBTypes that are built from classfiles, which may have a missing info. In order not to crash the compiler unnecessarily, the inliner does not force infos using `get`, but it reports inliner warnings for missing infos that prevent inlining.

Source
  BTypes.scala

Linear Supertypes
RefBType, BType, AnyRef, Any
Type Hierarchy

Ordering

1. Alphabetic
2. By Inheritance

Inherited

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

Implicitly

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

1. Hide All
2. Show All

Visibility

1. Public
2. Protected

### Abstract Value Members

1.  abstract def fromSymbol: Boolean

### Concrete 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
     This member is added by an implicit conversion from ClassBType toany2stringadd[ClassBType] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd
4.  def ->[B](y: B): (ClassBType, B)
   Implicit
     This member is added by an implicit conversion from ClassBType toArrowAssoc[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[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.CloneNotSupportedException]) @native()
13.  final def conformsTo(other: BType): Either[NoClassBTypeInfo, 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: Either[NoClassBTypeInfo, List[ClassBType]]
16.  def ensuring(cond: (ClassBType) => Boolean, msg: => Any): ClassBType
    Implicit
      This member is added by an implicit conversion from ClassBType toEnsuring[ClassBType] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
17.  def ensuring(cond: (ClassBType) => Boolean): ClassBType
    Implicit
      This member is added by an implicit conversion from ClassBType toEnsuring[ClassBType] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
18.  def ensuring(cond: Boolean, msg: => Any): ClassBType
    Implicit
      This member is added by an implicit conversion from ClassBType toEnsuring[ClassBType] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
19.  def ensuring(cond: Boolean): ClassBType
    Implicit
      This member is added by an implicit conversion from ClassBType toEnsuring[ClassBType] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring
20.  final def eq(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
21.  def equals(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef → Any
22.  def finalize(): Unit
    Attributes
      protected[lang]
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.Throwable])
23.  final def getClass(): Class[_ <: AnyRef]
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
24.  def hashCode(): Int
    Definition Classes
      AnyRef → Any
    Annotations
      @native()
25.  def info: Either[NoClassBTypeInfo, ClassInfo]
26.  def inlineInfoAttribute: Either[NoClassBTypeInfo, InlineInfoAttribute]
27.  def innerClassAttributeEntry: Either[NoClassBTypeInfo, Option[InnerClassEntry]]
28.  val internalName: InternalName
29.  final def isArray: Boolean
    Definition Classes
      BType
30.  final def isBoxed: Boolean
    Definition Classes
      BType
31.  final def isClass: Boolean
    Definition Classes
      BType
32.  final def isInstanceOf[T0]: Boolean
    Definition Classes
      Any
33.  final def isIntSizedType: Boolean
    Definition Classes
      BType
34.  final def isIntegralType: Boolean
    Definition Classes
      BType
35.  def isInterface: Either[NoClassBTypeInfo, Boolean]
36.  final def isMethod: Boolean
    Definition Classes
      BType
37.  def isNestedClass: Either[NoClassBTypeInfo, Boolean]
38.  final def isNonVoidPrimitiveType: Boolean
    Definition Classes
      BType
39.  final def isNothingType: Boolean
    Definition Classes
      BType
40.  final def isNullType: Boolean
    Definition Classes
      BType
41.  final def isNumericType: Boolean
    Definition Classes
      BType
42.  final def isPrimitive: Boolean
    Definition Classes
      BType
43.  def isPublic: Either[NoClassBTypeInfo, Boolean]
44.  final def isRealType: Boolean
    Definition Classes
      BType
45.  final def isRef: Boolean
    Definition Classes
      BType
46.  def isSubtypeOf(other: ClassBType): Either[NoClassBTypeInfo, Boolean]
47.  final def isWideType: Boolean
    Definition Classes
      BType
48.  def jvmWiseLUB(other: ClassBType): Either[NoClassBTypeInfo, ClassBType]

    Finding the least upper bound in agreement with the bytecode verifier Background: https://xavierleroy.org/publi/bytecode-verification-JAR.pdf http://comments.gmane.org/gmane.comp.java.vm.languages/2293 https://github.com/scala/bug/issues/3872#issuecomment-292386375

49.  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
50.  final def ne(arg0: AnyRef): Boolean
    Definition Classes
      AnyRef
51.  final def notify(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
52.  final def notifyAll(): Unit
    Definition Classes
      AnyRef
    Annotations
      @native()
53.  def packageInternalName: String

    The prefix of the internal name until the last '/', or the empty string.

54.  final def size: Int

    returns

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

    Definition Classes
      BType
55.  def superClassesChain: Either[NoClassBTypeInfo, List[ClassBType]]

    The super class chain of this type, starting with Object, ending with `this`.

56.  final def synchronized[T0](arg0: => T0): T0
    Definition Classes
      AnyRef
57.  val 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
      ClassBType → BType
58.  def toString(): String
    Definition Classes
      ClassBType → BType → AnyRef → Any
59.  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
60.  final def wait(): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
61.  final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException])
62.  final def wait(arg0: Long): Unit
    Definition Classes
      AnyRef
    Annotations
      @throws(classOf[java.lang.InterruptedException]) @native()

### Deprecated Value Members

1.  def formatted(fmtstr: String): String
   Implicit
     This member is added by an implicit conversion from ClassBType toStringFormat[ClassBType] performed by method StringFormat in scala.Predef.
   Definition Classes
     StringFormat
   Annotations
     @deprecated @inline()
   Deprecated

     (Since version 2.12.16) Use `formatString.format(value)` instead of `value.formatted(formatString)`, or use the `f""` string interpolator. In Java 15 and later, `formatted` resolves to the new method in String which has reversed parameters.

2.  def →[B](y: B): (ClassBType, B)
   Implicit
     This member is added by an implicit conversion from ClassBType toArrowAssoc[ClassBType] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @deprecated
   Deprecated

     (Since version 2.13.0) Use `->` instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

### Inherited from RefBType

### Inherited from BType

### Inherited from AnyRef

### Inherited from Any

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

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

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

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

### Ungrouped