Class

scala.tools.nsc.backend.jvm

BTypesFromSymbols

Related Doc: package jvm

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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 corresponding 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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Inherited
  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)

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Type Members

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

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    Definition Classes
    BTypes
  2. sealed trait BType extends AnyRef

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

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

    Definition Classes
    BTypes
  3. final case class ClassBType(internalName: InternalName) extends RefBType with Product with Serializable

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    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 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 (SI-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.

    Definition Classes
    BTypes
  4. final case class ClassInfo(superClass: Option[ClassBType], interfaces: List[ClassBType], flags: Int, nestedClasses: List[ClassBType], nestedInfo: Option[NestedInfo], inlineInfo: InlineInfo) extends Product with Serializable

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    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.

    nestedClasses

    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.

    inlineInfo

    Information about this class for the inliner.

    Definition Classes
    BTypes
  5. final case class InnerClassEntry(name: String, outerName: String, innerName: String, flags: Int) extends Product with Serializable

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

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

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

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

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

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    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 property: 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

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    Definition Classes
    BTypes
  10. sealed trait RefBType extends BType

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    Definition Classes
    BTypes

Value Members

  1. final def !=(arg0: Any): Boolean

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    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

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    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

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    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)

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    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

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    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).

    returns

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

    Definition Classes
    AnyRef → Any
  6. object BOOL extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  7. object BYTE extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  8. object CHAR extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  9. object ClassBType extends Serializable

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    Definition Classes
    BTypes
  10. object DOUBLE extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  11. object FLOAT extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  12. object INT extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  13. object LONG extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  14. object SHORT extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  15. object UNIT extends PrimitiveBType with Product with Serializable

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    Definition Classes
    BTypes
  16. final def asInstanceOf[T0]: T0

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    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.

  17. def assertClassNotArray(sym: G.Symbol): Unit

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  18. def assertClassNotArrayNotPrimitive(sym: G.Symbol): Unit

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  19. val bCodeAsmCommon: BCodeAsmCommon[global.type]

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  20. val bCodeICodeCommon: BCodeICodeCommon[global.type]

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  21. def bTypeForDescriptorOrInternalNameFromClassfile(desc: String): BType

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    Obtain the BType for a type descriptor or internal name.

    Obtain the BType for a type descriptor or internal name. For class descriptors, the ClassBType is constructed by parsing the corresponding classfile.

    Some JVM operations use either a full descriptor or only an internal name. Example: ANEWARRAY java/lang/String // a new array of strings (internal name for the String class) ANEWARRAY [Ljava/lang/String; // a new array of array of string (full descriptor for the String class)

    This method supports both descriptors and internal names.

    Definition Classes
    BTypes
  22. val backendReporting: BackendReporting

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    Definition Classes
    BTypesFromSymbolsBTypes
  23. val byteCodeRepository: ByteCodeRepository

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    Tools for parsing classfiles, used by the inliner.

    Tools for parsing classfiles, used by the inliner.

    Definition Classes
    BTypesFromSymbolsBTypes
  24. val callGraph: CallGraph[BTypesFromSymbols.this.type]

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    Definition Classes
    BTypesFromSymbolsBTypes
  25. val callsitePositions: Map[MethodInsnNode, Position]

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    Store the position of every MethodInsnNode during code generation.

    Store the position of every MethodInsnNode during code generation. This allows each callsite in the call graph to remember its source position, which is required for inliner warnings.

    Definition Classes
    BTypes
  26. def classBTypeFromClassNode(classNode: ClassNode): ClassBType

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    Construct the ClassBType for a parsed classfile.

    Construct the ClassBType for a parsed classfile.

    Definition Classes
    BTypes
  27. val classBTypeFromInternalName: Map[InternalName, ClassBType]

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    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.

    Definition Classes
    BTypes
  28. def classBTypeFromParsedClassfile(internalName: InternalName): ClassBType

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    Parse the classfile for internalName and construct the ClassBType.

    Parse the classfile for internalName and construct the ClassBType. If the classfile cannot be found in the byteCodeRepository, the info of the resulting ClassBType is undefined.

    Definition Classes
    BTypes
  29. final def classBTypeFromSymbol(classSym: G.Symbol): ClassBType

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    The ClassBType for a class symbol classSym.

    The ClassBType for a class symbol classSym.

    The class symbol scala.Nothing is mapped to the class scala.runtime.Nothing$. Similarly, scala.Null is mapped to scala.runtime.Null$. This is because there exist no class files for the Nothing / Null. If used for example as a parameter type, we use the runtime classes in the classfile method signature.

    Note that the referenced class symbol may be an implementation class. For example when compiling a mixed-in method that forwards to the static method in the implementation class, the class descriptor of the receiver (the implementation class) is obtained by creating the ClassBType.

  30. def clone(): AnyRef

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    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

  31. val closureOptimizer: ClosureOptimizer[BTypesFromSymbols.this.type]

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    Definition Classes
    BTypesFromSymbolsBTypes
  32. def compilerSettings: ScalaSettings

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    Definition Classes
    BTypesFromSymbolsBTypes
  33. val coreBTypes: CoreBTypesProxy[BTypesFromSymbols.this.type]

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    Definition Classes
    BTypesFromSymbolsBTypes
  34. def ensuring(cond: (BTypesFromSymbols[G]) ⇒ Boolean, msg: ⇒ Any): BTypesFromSymbols[G]

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

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

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

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    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
  38. final def eq(arg0: AnyRef): Boolean

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

    Tests whether the argument (that) 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
  39. def equals(arg0: Any): Boolean

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    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
  40. def finalize(): Unit

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    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

  41. def formatted(fmtstr: String): String

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    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()
  42. final def getClass(): Class[_]

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    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

  43. val global: G

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  44. final def hasPublicBitSet(flags: Int): Boolean

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  45. def hashCode(): Int

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    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
  46. final def initializeCoreBTypes(): Unit

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  47. def inlineInfoFromClassfile(classNode: ClassNode): InlineInfo

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    Build the InlineInfo for a class.

    Build the InlineInfo for a class. For Scala classes, the information is stored in the ScalaInlineInfo attribute. If the attribute is missing, the InlineInfo is built using the metadata available in the classfile (ACC_FINAL flags, etc).

    Definition Classes
    BTypes
  48. val inliner: Inliner[BTypesFromSymbols.this.type]

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    Definition Classes
    BTypesFromSymbolsBTypes
  49. def isCompilingArray: Boolean

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  50. def isCompilingPrimitive: Boolean

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    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
    BTypesFromSymbolsBTypes
  51. final def isInstanceOf[T0]: Boolean

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    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
  52. final def isRemote(s: G.Symbol): Boolean

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  53. final def isStaticModuleClass(sym: G.Symbol): Boolean

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    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.

  54. final def isTopLevelModuleClass(sym: G.Symbol): Boolean

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    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.

  55. val javaDefinedClasses: Set[InternalName]

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    Contains the internal names of all classes that are defined in Java source files of the current compilation run (mixed compilation).

    Contains the internal names of all classes that are defined in Java source files of the current compilation run (mixed compilation). Used for more detailed error reporting.

    Definition Classes
    BTypes
  56. def javaFieldFlags(sym: G.Symbol): Int

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  57. final def javaFlags(sym: G.Symbol): Int

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    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.

  58. val localOpt: LocalOpt[BTypesFromSymbols.this.type]

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    Definition Classes
    BTypesFromSymbolsBTypes
  59. final def methodBTypeFromSymbol(methodSymbol: G.Symbol): MethodBType

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    Builds a MethodBType for a method symbol.

  60. def mirrorClassClassBType(moduleClassSym: G.Symbol): ClassBType

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    For top-level objects without a companion class, the compilere generates a mirror class with static forwarders (Java compat).

    For top-level objects without a companion class, the compilere generates a mirror class with static forwarders (Java compat). There's no symbol for the mirror class, but we still need a ClassBType (its info.nestedClasses will hold the InnerClass entries, see comment in BTypes).

  61. final def ne(arg0: AnyRef): Boolean

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    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
  62. final def notify(): Unit

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    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

  63. final def notifyAll(): Unit

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    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

  64. def recordPerRunCache[T <: Clearable](cache: T): T

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    Definition Classes
    BTypesFromSymbolsBTypes
  65. final val strMODULE_INSTANCE_FIELD: String

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

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    Definition Classes
    AnyRef
  67. def toString(): String

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    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
  68. final def typeToBType(t: G.Type): BType

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    This method returns the BType for a type reference, for example a parameter type.

    This method returns the BType for a type reference, for example a parameter type.

    If t references a class, typeToBType ensures that the class is not an implementation class. See also comment on classBTypeFromSymbol, which is invoked for implementation classes.

  69. val unreachableCodeEliminated: Set[MethodNode]

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    Cache, contains methods whose unreachable instructions are eliminated.

    Cache, contains methods whose unreachable instructions are eliminated.

    The ASM Analyzer class does not compute any frame information for unreachable instructions. Transformations that use an analyzer (including inlining) therefore require unreachable code to be eliminated.

    This cache allows running dead code elimination whenever an analyzer is used. If the method is already optimized, DCE can return early.

    Definition Classes
    BTypes
  70. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  71. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  72. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  73. def [B](y: B): (BTypesFromSymbols[G], B)

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    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