/
Definitions.scala
1161 lines (1012 loc) · 58.5 KB
/
Definitions.scala
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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Martin Odersky
*/
package scala.reflect
package internal
import scala.annotation.{ switch, meta }
import scala.collection.{ mutable, immutable }
import Flags._
import scala.reflect.api.{Universe => ApiUniverse}
trait Definitions extends api.StandardDefinitions {
self: SymbolTable =>
import rootMirror.{getModule, getPackage, getClassByName, getRequiredClass, getRequiredModule, getClassIfDefined, getModuleIfDefined, getPackageObject, getPackageObjectIfDefined, requiredClass, requiredModule}
object definitions extends DefinitionsClass
/** Since both the value parameter types and the result type may
* require access to the type parameter symbols, we model polymorphic
* creation as a function from those symbols to (formal types, result type).
* The Option is to distinguish between nullary methods and empty-param-list
* methods.
*/
private type PolyMethodCreator = List[Symbol] => (Option[List[Type]], Type)
private def enterNewClass(owner: Symbol, name: TypeName, parents: List[Type], flags: Long = 0L): ClassSymbol = {
val clazz = owner.newClassSymbol(name, NoPosition, flags)
clazz setInfoAndEnter ClassInfoType(parents, newScope, clazz)
}
private def newMethod(owner: Symbol, name: TermName, formals: List[Type], restpe: Type, flags: Long): MethodSymbol = {
val msym = owner.newMethod(name.encode, NoPosition, flags)
val params = msym.newSyntheticValueParams(formals)
msym setInfo MethodType(params, restpe)
}
private def enterNewMethod(owner: Symbol, name: TermName, formals: List[Type], restpe: Type, flags: Long = 0L): MethodSymbol =
owner.info.decls enter newMethod(owner, name, formals, restpe, flags)
// the scala value classes
trait ValueClassDefinitions {
self: DefinitionsClass =>
import ClassfileConstants._
private val nameToWeight = Map[Name, Int](
tpnme.Byte -> 2,
tpnme.Char -> 3,
tpnme.Short -> 4,
tpnme.Int -> 12,
tpnme.Long -> 24,
tpnme.Float -> 48,
tpnme.Double -> 96
)
private val nameToTag = Map[Name, Char](
tpnme.Byte -> BYTE_TAG,
tpnme.Char -> CHAR_TAG,
tpnme.Short -> SHORT_TAG,
tpnme.Int -> INT_TAG,
tpnme.Long -> LONG_TAG,
tpnme.Float -> FLOAT_TAG,
tpnme.Double -> DOUBLE_TAG,
tpnme.Boolean -> BOOL_TAG,
tpnme.Unit -> VOID_TAG
)
private def catastrophicFailure() =
abort("Could not find value classes! This is a catastrophic failure. scala " +
scala.util.Properties.versionString)
private def valueClassSymbol(name: TypeName): ClassSymbol = {
getMember(ScalaPackageClass, name) match {
case x: ClassSymbol => x
case _ => catastrophicFailure()
}
}
private def valueClassCompanion(name: TermName): ModuleSymbol = {
getMember(ScalaPackageClass, name) match {
case x: ModuleSymbol => x
case _ => catastrophicFailure()
}
}
private def valueCompanionMember(className: Name, methodName: TermName): TermSymbol =
getMemberMethod(valueClassCompanion(className.toTermName).moduleClass, methodName)
private def classesMap[T](f: Name => T) = symbolsMap(ScalaValueClassesNoUnit, f)
private def symbolsMap[T](syms: List[Symbol], f: Name => T): Map[Symbol, T] = mapFrom(syms)(x => f(x.name))
private def symbolsMapFilt[T](syms: List[Symbol], p: Name => Boolean, f: Name => T) = symbolsMap(syms filter (x => p(x.name)), f)
private def boxedName(name: Name) = sn.Boxed(name.toTypeName)
lazy val abbrvTag = symbolsMap(ScalaValueClasses, nameToTag) withDefaultValue OBJECT_TAG
lazy val numericWeight = symbolsMapFilt(ScalaValueClasses, nameToWeight.keySet, nameToWeight)
lazy val boxedModule = classesMap(x => getModule(boxedName(x)))
lazy val boxedClass = classesMap(x => getClassByName(boxedName(x)))
lazy val refClass = classesMap(x => getRequiredClass("scala.runtime." + x + "Ref"))
lazy val volatileRefClass = classesMap(x => getRequiredClass("scala.runtime.Volatile" + x + "Ref"))
lazy val boxMethod = classesMap(x => valueCompanionMember(x, nme.box))
lazy val unboxMethod = classesMap(x => valueCompanionMember(x, nme.unbox))
def isNumericSubClass(sub: Symbol, sup: Symbol) = (
(numericWeight contains sub)
&& (numericWeight contains sup)
&& (numericWeight(sup) % numericWeight(sub) == 0)
)
/** Is symbol a numeric value class? */
def isNumericValueClass(sym: Symbol) = ScalaNumericValueClasses contains sym
def isGetClass(sym: Symbol) =
(sym.name == nme.getClass_) && flattensToEmpty(sym.paramss)
lazy val UnitClass = valueClassSymbol(tpnme.Unit)
lazy val ByteClass = valueClassSymbol(tpnme.Byte)
lazy val ShortClass = valueClassSymbol(tpnme.Short)
lazy val CharClass = valueClassSymbol(tpnme.Char)
lazy val IntClass = valueClassSymbol(tpnme.Int)
lazy val LongClass = valueClassSymbol(tpnme.Long)
lazy val FloatClass = valueClassSymbol(tpnme.Float)
lazy val DoubleClass = valueClassSymbol(tpnme.Double)
lazy val BooleanClass = valueClassSymbol(tpnme.Boolean)
lazy val Boolean_and = getMemberMethod(BooleanClass, nme.ZAND)
lazy val Boolean_or = getMemberMethod(BooleanClass, nme.ZOR)
lazy val Boolean_not = getMemberMethod(BooleanClass, nme.UNARY_!)
lazy val UnitTpe = UnitClass.toTypeConstructor
lazy val ByteTpe = ByteClass.toTypeConstructor
lazy val ShortTpe = ShortClass.toTypeConstructor
lazy val CharTpe = CharClass.toTypeConstructor
lazy val IntTpe = IntClass.toTypeConstructor
lazy val LongTpe = LongClass.toTypeConstructor
lazy val FloatTpe = FloatClass.toTypeConstructor
lazy val DoubleTpe = DoubleClass.toTypeConstructor
lazy val BooleanTpe = BooleanClass.toTypeConstructor
lazy val ScalaNumericValueClasses = ScalaValueClasses filterNot Set[Symbol](UnitClass, BooleanClass)
lazy val ScalaValueClassesNoUnit = ScalaValueClasses filterNot (_ eq UnitClass)
lazy val ScalaValueClasses: List[ClassSymbol] = List(
UnitClass,
BooleanClass,
ByteClass,
ShortClass,
CharClass,
IntClass,
LongClass,
FloatClass,
DoubleClass
)
def ScalaPrimitiveValueClasses: List[ClassSymbol] = ScalaValueClasses
}
abstract class DefinitionsClass extends DefinitionsApi with ValueClassDefinitions {
private var isInitialized = false
def isDefinitionsInitialized = isInitialized
@deprecated("Moved to rootMirror.RootPackage", "2.10.0")
val RootPackage: ModuleSymbol = rootMirror.RootPackage
@deprecated("Moved to rootMirror.RootClass", "2.10.0")
val RootClass: ClassSymbol = rootMirror.RootClass
@deprecated("Moved to rootMirror.EmptyPackage", "2.10.0")
val EmptyPackage: ModuleSymbol = rootMirror.EmptyPackage
@deprecated("Moved to rootMirror.EmptyPackageClass", "2.10.0")
val EmptyPackageClass: ClassSymbol = rootMirror.EmptyPackageClass
// It becomes tricky to create dedicated objects for other symbols because
// of initialization order issues.
lazy val JavaLangPackage = getPackage("java.lang")
lazy val JavaLangPackageClass = JavaLangPackage.moduleClass.asClass
lazy val ScalaPackage = getPackage("scala")
lazy val ScalaPackageClass = ScalaPackage.moduleClass.asClass
lazy val RuntimePackage = getPackage("scala.runtime")
lazy val RuntimePackageClass = RuntimePackage.moduleClass.asClass
// convenient one-argument parameter lists
lazy val anyparam = List(AnyClass.tpe)
lazy val anyvalparam = List(AnyValClass.typeConstructor)
lazy val anyrefparam = List(AnyRefClass.typeConstructor)
// private parameter conveniences
private def booltype = BooleanClass.tpe
private def inttype = IntClass.tpe
private def stringtype = StringClass.tpe
def javaTypeToValueClass(jtype: Class[_]): Symbol = jtype match {
case java.lang.Void.TYPE => UnitClass
case java.lang.Byte.TYPE => ByteClass
case java.lang.Character.TYPE => CharClass
case java.lang.Short.TYPE => ShortClass
case java.lang.Integer.TYPE => IntClass
case java.lang.Long.TYPE => LongClass
case java.lang.Float.TYPE => FloatClass
case java.lang.Double.TYPE => DoubleClass
case java.lang.Boolean.TYPE => BooleanClass
case _ => NoSymbol
}
def valueClassToJavaType(sym: Symbol): Class[_] = sym match {
case UnitClass => java.lang.Void.TYPE
case ByteClass => java.lang.Byte.TYPE
case CharClass => java.lang.Character.TYPE
case ShortClass => java.lang.Short.TYPE
case IntClass => java.lang.Integer.TYPE
case LongClass => java.lang.Long.TYPE
case FloatClass => java.lang.Float.TYPE
case DoubleClass => java.lang.Double.TYPE
case BooleanClass => java.lang.Boolean.TYPE
case _ => null
}
/** Fully initialize the symbol, type, or scope.
*/
def fullyInitializeSymbol(sym: Symbol): Symbol = {
sym.initialize
fullyInitializeType(sym.info)
fullyInitializeType(sym.tpe_*)
sym
}
def fullyInitializeType(tp: Type): Type = {
tp.typeParams foreach fullyInitializeSymbol
tp.paramss.flatten foreach fullyInitializeSymbol
tp
}
def fullyInitializeScope(scope: Scope): Scope = {
scope.sorted foreach fullyInitializeSymbol
scope
}
/** Is this symbol a member of Object or Any? */
def isUniversalMember(sym: Symbol) = (
(sym ne NoSymbol)
&& (ObjectClass isSubClass sym.owner)
)
/** Is this symbol unimportable? Unimportable symbols include:
* - constructors, because <init> is not a real name
* - private[this] members, which cannot be referenced from anywhere else
* - members of Any or Object, because every instance will inherit a
* definition which supersedes the imported one
*/
def isUnimportable(sym: Symbol) = (
(sym eq NoSymbol)
|| sym.isConstructor
|| sym.isPrivateLocal
|| isUniversalMember(sym)
)
def isImportable(sym: Symbol) = !isUnimportable(sym)
/** Is this type equivalent to Any, AnyVal, or AnyRef? */
def isTrivialTopType(tp: Type) = (
tp =:= AnyClass.tpe
|| tp =:= AnyValClass.tpe
|| tp =:= AnyRefClass.tpe
)
private def fixupAsAnyTrait(tpe: Type): Type = tpe match {
case ClassInfoType(parents, decls, clazz) =>
if (parents.head.typeSymbol == AnyClass) tpe
else {
assert(parents.head.typeSymbol == ObjectClass, parents)
ClassInfoType(AnyClass.tpe :: parents.tail, decls, clazz)
}
case PolyType(tparams, restpe) =>
PolyType(tparams, fixupAsAnyTrait(restpe))
}
// top types
lazy val AnyClass = enterNewClass(ScalaPackageClass, tpnme.Any, Nil, ABSTRACT)
lazy val AnyRefClass = newAlias(ScalaPackageClass, tpnme.AnyRef, ObjectClass.tpe)
lazy val ObjectClass = getRequiredClass(sn.Object.toString)
lazy val AnyTpe = definitions.AnyClass.toTypeConstructor
lazy val AnyRefTpe = definitions.AnyRefClass.toTypeConstructor
lazy val ObjectTpe = definitions.ObjectClass.toTypeConstructor
// Note: this is not the type alias AnyRef, it's a companion-like
// object used by the @specialize annotation.
lazy val AnyRefModule = getMemberModule(ScalaPackageClass, nme.AnyRef)
@deprecated("Use AnyRefModule", "2.10.0")
def Predef_AnyRef = AnyRefModule
lazy val AnyValClass: ClassSymbol = (ScalaPackageClass.info member tpnme.AnyVal orElse {
val anyval = enterNewClass(ScalaPackageClass, tpnme.AnyVal, List(AnyClass.tpe, NotNullClass.tpe), ABSTRACT)
val av_constr = anyval.newClassConstructor(NoPosition)
anyval.info.decls enter av_constr
anyval
}).asInstanceOf[ClassSymbol]
lazy val AnyValTpe = definitions.AnyValClass.toTypeConstructor
def AnyVal_getClass = getMemberMethod(AnyValClass, nme.getClass_)
// bottom types
lazy val RuntimeNothingClass = getClassByName(fulltpnme.RuntimeNothing)
lazy val RuntimeNullClass = getClassByName(fulltpnme.RuntimeNull)
sealed abstract class BottomClassSymbol(name: TypeName, parent: Symbol) extends ClassSymbol(ScalaPackageClass, NoPosition, name) {
locally {
this initFlags ABSTRACT | FINAL
this setInfoAndEnter ClassInfoType(List(parent.tpe), newScope, this)
}
final override def isBottomClass = true
}
final object NothingClass extends BottomClassSymbol(tpnme.Nothing, AnyClass) {
override def isSubClass(that: Symbol) = true
}
final object NullClass extends BottomClassSymbol(tpnme.Null, AnyRefClass) {
override def isSubClass(that: Symbol) = (
(that eq AnyClass)
|| (that ne NothingClass) && (that isSubClass ObjectClass)
)
}
lazy val NothingTpe = definitions.NothingClass.toTypeConstructor
lazy val NullTpe = definitions.NullClass.toTypeConstructor
// exceptions and other throwables
lazy val ClassCastExceptionClass = requiredClass[ClassCastException]
lazy val IndexOutOfBoundsExceptionClass = getClassByName(sn.IOOBException)
lazy val InvocationTargetExceptionClass = getClassByName(sn.InvTargetException)
lazy val MatchErrorClass = requiredClass[MatchError]
lazy val NonLocalReturnControlClass = requiredClass[scala.runtime.NonLocalReturnControl[_]]
lazy val NullPointerExceptionClass = getClassByName(sn.NPException)
lazy val ThrowableClass = getClassByName(sn.Throwable)
lazy val UninitializedErrorClass = requiredClass[UninitializedFieldError]
lazy val NPEConstructor = getMemberMethod(NullPointerExceptionClass, nme.CONSTRUCTOR) suchThat (_.paramss.flatten.isEmpty)
lazy val UninitializedFieldConstructor = UninitializedErrorClass.primaryConstructor
// fundamental reference classes
lazy val PartialFunctionClass = requiredClass[PartialFunction[_,_]]
lazy val AbstractPartialFunctionClass = requiredClass[scala.runtime.AbstractPartialFunction[_,_]]
lazy val SymbolClass = requiredClass[scala.Symbol]
lazy val StringClass = requiredClass[java.lang.String]
lazy val StringModule = StringClass.linkedClassOfClass
lazy val ClassClass = requiredClass[java.lang.Class[_]]
def Class_getMethod = getMemberMethod(ClassClass, nme.getMethod_)
lazy val DynamicClass = requiredClass[Dynamic]
// fundamental modules
lazy val SysPackage = getPackageObject("scala.sys")
def Sys_error = getMemberMethod(SysPackage, nme.error)
// Modules whose members are in the default namespace
// SI-5941: ScalaPackage and JavaLangPackage are never ever shared between mirrors
// as a result, `Int` becomes `scala.Int` and `String` becomes `java.lang.String`
// I could just change `isOmittablePrefix`, but there's more to it, so I'm leaving this as a todo for now
lazy val UnqualifiedModules = List(PredefModule, ScalaPackage, JavaLangPackage)
// Those modules and their module classes
lazy val UnqualifiedOwners = UnqualifiedModules.toSet ++ UnqualifiedModules.map(_.moduleClass)
lazy val PredefModule = requiredModule[scala.Predef.type]
def Predef_classOf = getMemberMethod(PredefModule, nme.classOf)
def Predef_wrapRefArray = getMemberMethod(PredefModule, nme.wrapRefArray)
def Predef_wrapArray(tp: Type) = getMemberMethod(PredefModule, wrapArrayMethodName(tp))
def Predef_??? = getMemberMethod(PredefModule, nme.???)
def Predef_implicitly = getMemberMethod(PredefModule, nme.implicitly)
/** Is `sym` a member of Predef with the given name?
* Note: DON't replace this by sym == Predef_conforms/etc, as Predef_conforms is a `def`
* which does a member lookup (it can't be a lazy val because we might reload Predef
* during resident compilations).
*/
def isPredefMemberNamed(sym: Symbol, name: Name) = (
(sym.name == name) && (sym.owner == PredefModule.moduleClass)
)
/** Specialization.
*/
lazy val SpecializableModule = requiredModule[Specializable]
lazy val GroupOfSpecializable = getMemberClass(SpecializableModule, tpnme.Group)
lazy val ScalaRunTimeModule = requiredModule[scala.runtime.ScalaRunTime.type]
lazy val SymbolModule = requiredModule[scala.Symbol.type]
lazy val Symbol_apply = getMemberMethod(SymbolModule, nme.apply)
def arrayApplyMethod = getMemberMethod(ScalaRunTimeModule, nme.array_apply)
def arrayUpdateMethod = getMemberMethod(ScalaRunTimeModule, nme.array_update)
def arrayLengthMethod = getMemberMethod(ScalaRunTimeModule, nme.array_length)
def arrayCloneMethod = getMemberMethod(ScalaRunTimeModule, nme.array_clone)
def ensureAccessibleMethod = getMemberMethod(ScalaRunTimeModule, nme.ensureAccessible)
def arrayClassMethod = getMemberMethod(ScalaRunTimeModule, nme.arrayClass)
// classes with special meanings
lazy val StringAddClass = requiredClass[scala.runtime.StringAdd]
lazy val ArrowAssocClass = getRequiredClass("scala.Predef.ArrowAssoc") // SI-5731
lazy val StringAdd_+ = getMemberMethod(StringAddClass, nme.PLUS)
lazy val NotNullClass = getRequiredClass("scala.NotNull")
lazy val ScalaNumberClass = requiredClass[scala.math.ScalaNumber]
lazy val TraitSetterAnnotationClass = requiredClass[scala.runtime.TraitSetter]
lazy val DelayedInitClass = requiredClass[scala.DelayedInit]
def delayedInitMethod = getMemberMethod(DelayedInitClass, nme.delayedInit)
lazy val TypeConstraintClass = requiredClass[scala.annotation.TypeConstraint]
lazy val SingletonClass = enterNewClass(ScalaPackageClass, tpnme.Singleton, anyparam, ABSTRACT | TRAIT | FINAL)
lazy val SerializableClass = requiredClass[scala.Serializable]
lazy val JavaSerializableClass = requiredClass[java.io.Serializable] modifyInfo fixupAsAnyTrait
lazy val ComparableClass = requiredClass[java.lang.Comparable[_]] modifyInfo fixupAsAnyTrait
lazy val CloneableClass = requiredClass[scala.Cloneable]
lazy val JavaCloneableClass = requiredClass[java.lang.Cloneable]
lazy val JavaNumberClass = requiredClass[java.lang.Number]
lazy val RemoteInterfaceClass = requiredClass[java.rmi.Remote]
lazy val RemoteExceptionClass = requiredClass[java.rmi.RemoteException]
lazy val ByNameParamClass = specialPolyClass(tpnme.BYNAME_PARAM_CLASS_NAME, COVARIANT)(_ => AnyClass.tpe)
lazy val JavaRepeatedParamClass = specialPolyClass(tpnme.JAVA_REPEATED_PARAM_CLASS_NAME, COVARIANT)(tparam => arrayType(tparam.tpe))
lazy val RepeatedParamClass = specialPolyClass(tpnme.REPEATED_PARAM_CLASS_NAME, COVARIANT)(tparam => seqType(tparam.tpe))
def isByNameParamType(tp: Type) = tp.typeSymbol == ByNameParamClass
def isScalaRepeatedParamType(tp: Type) = tp.typeSymbol == RepeatedParamClass
def isJavaRepeatedParamType(tp: Type) = tp.typeSymbol == JavaRepeatedParamClass
def isRepeatedParamType(tp: Type) = isScalaRepeatedParamType(tp) || isJavaRepeatedParamType(tp)
def isRepeated(param: Symbol) = isRepeatedParamType(param.tpe_*)
def isByName(param: Symbol) = isByNameParamType(param.tpe_*)
def isCastSymbol(sym: Symbol) = sym == Any_asInstanceOf || sym == Object_asInstanceOf
def isJavaVarArgsMethod(m: Symbol) = m.isMethod && isJavaVarArgs(m.info.params)
def isJavaVarArgs(params: Seq[Symbol]) = params.nonEmpty && isJavaRepeatedParamType(params.last.tpe)
def isScalaVarArgs(params: Seq[Symbol]) = params.nonEmpty && isScalaRepeatedParamType(params.last.tpe)
def isVarArgsList(params: Seq[Symbol]) = params.nonEmpty && isRepeatedParamType(params.last.tpe)
def isVarArgTypes(formals: Seq[Type]) = formals.nonEmpty && isRepeatedParamType(formals.last)
def hasRepeatedParam(tp: Type): Boolean = tp match {
case MethodType(formals, restpe) => isScalaVarArgs(formals) || hasRepeatedParam(restpe)
case PolyType(_, restpe) => hasRepeatedParam(restpe)
case _ => false
}
def repeatedToSeq(tp: Type): Type = (tp baseType RepeatedParamClass) match {
case TypeRef(_, RepeatedParamClass, arg :: Nil) => seqType(arg)
case _ => tp
}
def seqToRepeated(tp: Type): Type = (tp baseType SeqClass) match {
case TypeRef(_, SeqClass, arg :: Nil) => scalaRepeatedType(arg)
case _ => tp
}
def isReferenceArray(tp: Type) = tp match {
case TypeRef(_, ArrayClass, arg :: Nil) => arg <:< AnyRefClass.tpe
case _ => false
}
def isArrayOfSymbol(tp: Type, elem: Symbol) = tp match {
case TypeRef(_, ArrayClass, arg :: Nil) => arg.typeSymbol == elem
case _ => false
}
// collections classes
lazy val ConsClass = requiredClass[scala.collection.immutable.::[_]]
lazy val IteratorClass = requiredClass[scala.collection.Iterator[_]]
lazy val ListClass = requiredClass[scala.collection.immutable.List[_]]
lazy val SeqClass = requiredClass[scala.collection.Seq[_]]
lazy val StringBuilderClass = requiredClass[scala.collection.mutable.StringBuilder]
lazy val TraversableClass = requiredClass[scala.collection.Traversable[_]]
lazy val ListModule = requiredModule[scala.collection.immutable.List.type]
lazy val List_apply = getMemberMethod(ListModule, nme.apply)
lazy val NilModule = requiredModule[scala.collection.immutable.Nil.type]
lazy val SeqModule = requiredModule[scala.collection.Seq.type]
// arrays and their members
lazy val ArrayModule = requiredModule[scala.Array.type]
lazy val ArrayModule_overloadedApply = getMemberMethod(ArrayModule, nme.apply)
def ArrayModule_genericApply = ArrayModule_overloadedApply.suchThat(_.paramss.flatten.last.tpe.typeSymbol == ClassTagClass) // [T: ClassTag](xs: T*): Array[T]
def ArrayModule_apply(tp: Type) = ArrayModule_overloadedApply.suchThat(_.tpe.resultType =:= arrayType(tp)) // (p1: AnyVal1, ps: AnyVal1*): Array[AnyVal1]
lazy val ArrayClass = getRequiredClass("scala.Array") // requiredClass[scala.Array[_]]
lazy val Array_apply = getMemberMethod(ArrayClass, nme.apply)
lazy val Array_update = getMemberMethod(ArrayClass, nme.update)
lazy val Array_length = getMemberMethod(ArrayClass, nme.length)
lazy val Array_clone = getMemberMethod(ArrayClass, nme.clone_)
// reflection / structural types
lazy val SoftReferenceClass = requiredClass[java.lang.ref.SoftReference[_]]
lazy val MethodClass = getClassByName(sn.MethodAsObject)
lazy val EmptyMethodCacheClass = requiredClass[scala.runtime.EmptyMethodCache]
lazy val MethodCacheClass = requiredClass[scala.runtime.MethodCache]
def methodCache_find = getMemberMethod(MethodCacheClass, nme.find_)
def methodCache_add = getMemberMethod(MethodCacheClass, nme.add_)
// scala.reflect
lazy val ReflectPackage = requiredModule[scala.reflect.`package`.type]
lazy val ReflectApiPackage = getPackageObjectIfDefined("scala.reflect.api") // defined in scala-reflect.jar, so we need to be careful
lazy val ReflectRuntimePackage = getPackageObjectIfDefined("scala.reflect.runtime") // defined in scala-reflect.jar, so we need to be careful
def ReflectRuntimeUniverse = if (ReflectRuntimePackage != NoSymbol) getMemberValue(ReflectRuntimePackage, nme.universe) else NoSymbol
def ReflectRuntimeCurrentMirror = if (ReflectRuntimePackage != NoSymbol) getMemberMethod(ReflectRuntimePackage, nme.currentMirror) else NoSymbol
lazy val PartialManifestClass = getTypeMember(ReflectPackage, tpnme.ClassManifest)
lazy val PartialManifestModule = requiredModule[scala.reflect.ClassManifestFactory.type]
lazy val FullManifestClass = requiredClass[scala.reflect.Manifest[_]]
lazy val FullManifestModule = requiredModule[scala.reflect.ManifestFactory.type]
lazy val OptManifestClass = requiredClass[scala.reflect.OptManifest[_]]
lazy val NoManifest = requiredModule[scala.reflect.NoManifest.type]
lazy val ExprsClass = getClassIfDefined("scala.reflect.api.Exprs") // defined in scala-reflect.jar, so we need to be careful
lazy val ExprClass = if (ExprsClass != NoSymbol) getMemberClass(ExprsClass, tpnme.Expr) else NoSymbol
def ExprSplice = if (ExprsClass != NoSymbol) getMemberMethod(ExprClass, nme.splice) else NoSymbol
def ExprValue = if (ExprsClass != NoSymbol) getMemberMethod(ExprClass, nme.value) else NoSymbol
lazy val ClassTagModule = requiredModule[scala.reflect.ClassTag[_]]
lazy val ClassTagClass = requiredClass[scala.reflect.ClassTag[_]]
lazy val TypeTagsClass = getClassIfDefined("scala.reflect.api.TypeTags") // defined in scala-reflect.jar, so we need to be careful
lazy val WeakTypeTagClass = if (TypeTagsClass != NoSymbol) getMemberClass(TypeTagsClass, tpnme.WeakTypeTag) else NoSymbol
lazy val WeakTypeTagModule = if (TypeTagsClass != NoSymbol) getMemberModule(TypeTagsClass, nme.WeakTypeTag) else NoSymbol
lazy val TypeTagClass = if (TypeTagsClass != NoSymbol) getMemberClass(TypeTagsClass, tpnme.TypeTag) else NoSymbol
lazy val TypeTagModule = if (TypeTagsClass != NoSymbol) getMemberModule(TypeTagsClass, nme.TypeTag) else NoSymbol
def materializeClassTag = getMemberMethod(ReflectPackage, nme.materializeClassTag)
def materializeWeakTypeTag = if (ReflectApiPackage != NoSymbol) getMemberMethod(ReflectApiPackage, nme.materializeWeakTypeTag) else NoSymbol
def materializeTypeTag = if (ReflectApiPackage != NoSymbol) getMemberMethod(ReflectApiPackage, nme.materializeTypeTag) else NoSymbol
lazy val ApiUniverseClass = getClassIfDefined("scala.reflect.api.Universe") // defined in scala-reflect.jar, so we need to be careful
def ApiUniverseReify = if (ApiUniverseClass != NoSymbol) getMemberMethod(ApiUniverseClass, nme.reify) else NoSymbol
lazy val JavaUniverseClass = getClassIfDefined("scala.reflect.api.JavaUniverse") // defined in scala-reflect.jar, so we need to be careful
lazy val MirrorClass = getClassIfDefined("scala.reflect.api.Mirror") // defined in scala-reflect.jar, so we need to be careful
lazy val TypeCreatorClass = getClassIfDefined("scala.reflect.api.TypeCreator") // defined in scala-reflect.jar, so we need to be careful
lazy val TreeCreatorClass = getClassIfDefined("scala.reflect.api.TreeCreator") // defined in scala-reflect.jar, so we need to be careful
lazy val MacroContextClass = getClassIfDefined("scala.reflect.macros.Context") // defined in scala-reflect.jar, so we need to be careful
def MacroContextPrefix = if (MacroContextClass != NoSymbol) getMemberMethod(MacroContextClass, nme.prefix) else NoSymbol
def MacroContextPrefixType = if (MacroContextClass != NoSymbol) getTypeMember(MacroContextClass, tpnme.PrefixType) else NoSymbol
def MacroContextUniverse = if (MacroContextClass != NoSymbol) getMemberMethod(MacroContextClass, nme.universe) else NoSymbol
lazy val MacroImplAnnotation = requiredClass[scala.reflect.macros.internal.macroImpl]
lazy val StringContextClass = requiredClass[scala.StringContext]
def StringContext_f = getMemberMethod(StringContextClass, nme.f)
lazy val ScalaSignatureAnnotation = requiredClass[scala.reflect.ScalaSignature]
lazy val ScalaLongSignatureAnnotation = requiredClass[scala.reflect.ScalaLongSignature]
// Option classes
lazy val OptionClass: ClassSymbol = requiredClass[Option[_]]
lazy val OptionModule: ModuleSymbol = requiredModule[scala.Option.type]
lazy val Option_apply = getMemberMethod(OptionModule, nme.apply)
lazy val SomeClass: ClassSymbol = requiredClass[Some[_]]
lazy val NoneModule: ModuleSymbol = requiredModule[scala.None.type]
lazy val SomeModule: ModuleSymbol = requiredModule[scala.Some.type]
def compilerTypeFromTag(tt: ApiUniverse # WeakTypeTag[_]): Type = tt.in(rootMirror).tpe
def compilerSymbolFromTag(tt: ApiUniverse # WeakTypeTag[_]): Symbol = tt.in(rootMirror).tpe.typeSymbol
// The given symbol represents either String.+ or StringAdd.+
def isStringAddition(sym: Symbol) = sym == String_+ || sym == StringAdd_+
def isArrowAssoc(sym: Symbol) = sym.owner == ArrowAssocClass
// The given symbol is a method with the right name and signature to be a runnable java program.
def isJavaMainMethod(sym: Symbol) = (sym.name == nme.main) && (sym.info match {
case MethodType(p :: Nil, restpe) => isArrayOfSymbol(p.tpe, StringClass) && restpe.typeSymbol == UnitClass
case _ => false
})
// The given class has a main method.
def hasJavaMainMethod(sym: Symbol): Boolean =
(sym.tpe member nme.main).alternatives exists isJavaMainMethod
// Product, Tuple, Function, AbstractFunction
private def mkArityArray(name: String, arity: Int, countFrom: Int): Array[ClassSymbol] = {
val list = countFrom to arity map (i => getRequiredClass("scala." + name + i))
list.toArray
}
def prepend[S >: ClassSymbol : ClassTag](elem0: S, elems: Array[ClassSymbol]): Array[S] = elem0 +: elems
private def aritySpecificType[S <: Symbol](symbolArray: Array[S], args: List[Type], others: Type*): Type = {
val arity = args.length
if (arity >= symbolArray.length) NoType
else appliedType(symbolArray(arity), args ++ others: _*)
}
val MaxTupleArity, MaxProductArity, MaxFunctionArity = 22
lazy val ProductClass: Array[ClassSymbol] = prepend(UnitClass, mkArityArray("Product", MaxProductArity, 1))
lazy val TupleClass: Array[Symbol] = prepend(NoSymbol, mkArityArray("Tuple", MaxTupleArity, 1))
lazy val FunctionClass = mkArityArray("Function", MaxFunctionArity, 0)
lazy val AbstractFunctionClass = mkArityArray("runtime.AbstractFunction", MaxFunctionArity, 0)
/** Creators for TupleN, ProductN, FunctionN. */
def tupleType(elems: List[Type]) = aritySpecificType(TupleClass, elems)
def functionType(formals: List[Type], restpe: Type) = aritySpecificType(FunctionClass, formals, restpe)
def abstractFunctionType(formals: List[Type], restpe: Type) = aritySpecificType(AbstractFunctionClass, formals, restpe)
def wrapArrayMethodName(elemtp: Type): TermName = elemtp.typeSymbol match {
case ByteClass => nme.wrapByteArray
case ShortClass => nme.wrapShortArray
case CharClass => nme.wrapCharArray
case IntClass => nme.wrapIntArray
case LongClass => nme.wrapLongArray
case FloatClass => nme.wrapFloatArray
case DoubleClass => nme.wrapDoubleArray
case BooleanClass => nme.wrapBooleanArray
case UnitClass => nme.wrapUnitArray
case _ =>
if ((elemtp <:< AnyRefClass.tpe) && !isPhantomClass(elemtp.typeSymbol)) nme.wrapRefArray
else nme.genericWrapArray
}
// NOTE: returns true for NoSymbol since it's included in the TupleClass array -- is this intensional?
def isTupleSymbol(sym: Symbol) = TupleClass contains unspecializedSymbol(sym)
def isProductNClass(sym: Symbol) = ProductClass contains sym
def unspecializedSymbol(sym: Symbol): Symbol = {
if (sym hasFlag SPECIALIZED) {
// add initialization from its generic class constructor
val genericName = nme.unspecializedName(sym.name)
val member = sym.owner.info.decl(genericName.toTypeName)
member
}
else sym
}
// Checks whether the given type is true for the given condition,
// or if it is a specialized subtype of a type for which it is true.
//
// Origins notes:
// An issue was introduced with specialization in that the implementation
// of "isTupleType" in Definitions relied upon sym == TupleClass(elems.length).
// This test is untrue for specialized tuples, causing mysterious behavior
// because only some tuples are specialized.
def isPossiblySpecializedType(tp: Type)(cond: Type => Boolean) = {
cond(tp) || (tp match {
case TypeRef(pre, sym, args) if sym hasFlag SPECIALIZED =>
cond(tp baseType unspecializedSymbol(sym))
case _ =>
false
})
}
// No normalization.
def isTupleTypeDirect(tp: Type) = isPossiblySpecializedType(tp) {
case TypeRef(_, sym, args) if args.nonEmpty =>
val len = args.length
len <= MaxTupleArity && sym == TupleClass(len)
case _ => false
}
def isTupleType(tp: Type) = isTupleTypeDirect(tp.normalize)
lazy val ProductRootClass: ClassSymbol = requiredClass[scala.Product]
def Product_productArity = getMemberMethod(ProductRootClass, nme.productArity)
def Product_productElement = getMemberMethod(ProductRootClass, nme.productElement)
def Product_iterator = getMemberMethod(ProductRootClass, nme.productIterator)
def Product_productPrefix = getMemberMethod(ProductRootClass, nme.productPrefix)
def Product_canEqual = getMemberMethod(ProductRootClass, nme.canEqual_)
def productProj(z:Symbol, j: Int): TermSymbol = getMemberValue(z, nme.productAccessorName(j))
/** if tpe <: ProductN[T1,...,TN], returns List(T1,...,TN) else Nil */
def getProductArgs(tpe: Type): List[Type] = tpe.baseClasses find isProductNClass match {
case Some(x) => tpe.baseType(x).typeArgs
case _ => Nil
}
def dropNullaryMethod(tp: Type) = tp match {
case NullaryMethodType(restpe) => restpe
case _ => tp
}
def unapplyUnwrap(tpe:Type) = tpe.finalResultType.normalize match {
case RefinedType(p :: _, _) => p.normalize
case tp => tp
}
def abstractFunctionForFunctionType(tp: Type) =
if (isFunctionType(tp)) abstractFunctionType(tp.typeArgs.init, tp.typeArgs.last)
else NoType
def isFunctionType(tp: Type): Boolean = tp.normalize match {
case TypeRef(_, sym, args) if args.nonEmpty =>
val arity = args.length - 1 // -1 is the return type
arity <= MaxFunctionArity && sym == FunctionClass(arity)
case _ =>
false
}
def isPartialFunctionType(tp: Type): Boolean = {
val sym = tp.typeSymbol
(sym eq PartialFunctionClass) || (sym eq AbstractPartialFunctionClass)
}
def elementType(container: Symbol, tp: Type): Type = tp match {
case TypeRef(_, `container`, arg :: Nil) => arg
case _ => NoType
}
def arrayType(arg: Type) = appliedType(ArrayClass, arg)
def byNameType(arg: Type) = appliedType(ByNameParamClass, arg)
def iteratorOfType(tp: Type) = appliedType(IteratorClass, tp)
def javaRepeatedType(arg: Type) = appliedType(JavaRepeatedParamClass, arg)
def optionType(tp: Type) = appliedType(OptionClass, tp)
def scalaRepeatedType(arg: Type) = appliedType(RepeatedParamClass, arg)
def seqType(arg: Type) = appliedType(SeqClass, arg)
def ClassType(arg: Type) = if (phase.erasedTypes) ClassClass.tpe else appliedType(ClassClass, arg)
/** Can we tell by inspecting the symbol that it will never
* at any phase have type parameters?
*/
def neverHasTypeParameters(sym: Symbol) = sym match {
case _: RefinementClassSymbol => true
case _: ModuleClassSymbol => true
case _: ImplClassSymbol => true
case _ =>
(
sym.isPrimitiveValueClass
|| sym.isAnonymousClass
|| sym.initialize.isMonomorphicType
)
}
def EnumType(sym: Symbol) =
// given (in java): "class A { enum E { VAL1 } }"
// - sym: the symbol of the actual enumeration value (VAL1)
// - .owner: the ModuleClassSymbol of the enumeration (object E)
// - .linkedClassOfClass: the ClassSymbol of the enumeration (class E)
sym.owner.linkedClassOfClass.tpe
/** Given a class symbol C with type parameters T1, T2, ... Tn
* which have upper/lower bounds LB1/UB1, LB1/UB2, ..., LBn/UBn,
* returns an existential type of the form
*
* C[E1, ..., En] forSome { E1 >: LB1 <: UB1 ... en >: LBn <: UBn }.
*/
def classExistentialType(clazz: Symbol): Type =
newExistentialType(clazz.typeParams, clazz.tpe_*)
// members of class scala.Any
lazy val Any_== = enterNewMethod(AnyClass, nme.EQ, anyparam, booltype, FINAL)
lazy val Any_!= = enterNewMethod(AnyClass, nme.NE, anyparam, booltype, FINAL)
lazy val Any_equals = enterNewMethod(AnyClass, nme.equals_, anyparam, booltype)
lazy val Any_hashCode = enterNewMethod(AnyClass, nme.hashCode_, Nil, inttype)
lazy val Any_toString = enterNewMethod(AnyClass, nme.toString_, Nil, stringtype)
lazy val Any_## = enterNewMethod(AnyClass, nme.HASHHASH, Nil, inttype, FINAL)
// Any_getClass requires special handling. The return type is determined on
// a per-call-site basis as if the function being called were actually:
//
// // Assuming `target.getClass()`
// def getClass[T](target: T): Class[_ <: T]
//
// Since getClass is not actually a polymorphic method, this requires compiler
// participation. At the "Any" level, the return type is Class[_] as it is in
// java.lang.Object. Java also special cases the return type.
lazy val Any_getClass = enterNewMethod(AnyClass, nme.getClass_, Nil, getMemberMethod(ObjectClass, nme.getClass_).tpe.resultType, DEFERRED)
lazy val Any_isInstanceOf = newT1NullaryMethod(AnyClass, nme.isInstanceOf_, FINAL)(_ => booltype)
lazy val Any_asInstanceOf = newT1NullaryMethod(AnyClass, nme.asInstanceOf_, FINAL)(_.typeConstructor)
// A type function from T => Class[U], used to determine the return
// type of getClass calls. The returned type is:
//
// 1. If T is a value type, Class[T].
// 2. If T is a phantom type (Any or AnyVal), Class[_].
// 3. If T is a local class, Class[_ <: |T|].
// 4. Otherwise, Class[_ <: T].
//
// Note: AnyVal cannot be Class[_ <: AnyVal] because if the static type of the
// receiver is AnyVal, it implies the receiver is boxed, so the correct
// class object is that of java.lang.Integer, not Int.
//
// TODO: If T is final, return type could be Class[T]. Should it?
def getClassReturnType(tp: Type): Type = {
val sym = tp.typeSymbol
if (phase.erasedTypes) ClassClass.tpe
else if (isPrimitiveValueClass(sym)) ClassType(tp.widen)
else {
val eparams = typeParamsToExistentials(ClassClass, ClassClass.typeParams)
val upperBound = (
if (isPhantomClass(sym)) AnyClass.tpe
else if (sym.isLocalClass) erasure.intersectionDominator(tp.parents)
else tp.widen
)
existentialAbstraction(
eparams,
ClassType((eparams.head setInfo TypeBounds.upper(upperBound)).tpe)
)
}
}
/** Remove references to class Object (other than the head) in a list of parents */
def removeLaterObjects(tps: List[Type]): List[Type] = tps match {
case Nil => Nil
case x :: xs => x :: xs.filterNot(_.typeSymbol == ObjectClass)
}
/** Remove all but one reference to class Object from a list of parents. */
def removeRedundantObjects(tps: List[Type]): List[Type] = tps match {
case Nil => Nil
case x :: xs =>
if (x.typeSymbol == ObjectClass)
x :: xs.filterNot(_.typeSymbol == ObjectClass)
else
x :: removeRedundantObjects(xs)
}
/** The following transformations applied to a list of parents.
* If any parent is a class/trait, all parents which normalize to
* Object are discarded. Otherwise, all parents which normalize
* to Object except the first one found are discarded.
*/
def normalizedParents(parents: List[Type]): List[Type] = {
if (parents exists (t => (t.typeSymbol ne ObjectClass) && t.typeSymbol.isClass))
parents filterNot (_.typeSymbol eq ObjectClass)
else
removeRedundantObjects(parents)
}
/** Flatten curried parameter lists of a method type. */
def allParameters(tpe: Type): List[Symbol] = tpe match {
case MethodType(params, res) => params ::: allParameters(res)
case _ => Nil
}
def typeStringNoPackage(tp: Type) =
"" + tp stripPrefix tp.typeSymbol.enclosingPackage.fullName + "."
def briefParentsString(parents: List[Type]) =
normalizedParents(parents) map typeStringNoPackage mkString " with "
def parentsString(parents: List[Type]) =
normalizedParents(parents) mkString " with "
def valueParamsString(tp: Type) = tp match {
case MethodType(params, _) => params map (_.defString) mkString ("(", ",", ")")
case _ => ""
}
// members of class java.lang.{ Object, String }
lazy val Object_## = enterNewMethod(ObjectClass, nme.HASHHASH, Nil, inttype, FINAL)
lazy val Object_== = enterNewMethod(ObjectClass, nme.EQ, anyrefparam, booltype, FINAL)
lazy val Object_!= = enterNewMethod(ObjectClass, nme.NE, anyrefparam, booltype, FINAL)
lazy val Object_eq = enterNewMethod(ObjectClass, nme.eq, anyrefparam, booltype, FINAL)
lazy val Object_ne = enterNewMethod(ObjectClass, nme.ne, anyrefparam, booltype, FINAL)
lazy val Object_isInstanceOf = newT1NoParamsMethod(ObjectClass, nme.isInstanceOf_Ob, FINAL | SYNTHETIC | ARTIFACT)(_ => booltype)
lazy val Object_asInstanceOf = newT1NoParamsMethod(ObjectClass, nme.asInstanceOf_Ob, FINAL | SYNTHETIC | ARTIFACT)(_.typeConstructor)
lazy val Object_synchronized = newPolyMethod(1, ObjectClass, nme.synchronized_, FINAL)(tps =>
(Some(List(tps.head.typeConstructor)), tps.head.typeConstructor)
)
lazy val String_+ = enterNewMethod(StringClass, nme.raw.PLUS, anyparam, stringtype, FINAL)
def Object_getClass = getMemberMethod(ObjectClass, nme.getClass_)
def Object_clone = getMemberMethod(ObjectClass, nme.clone_)
def Object_finalize = getMemberMethod(ObjectClass, nme.finalize_)
def Object_notify = getMemberMethod(ObjectClass, nme.notify_)
def Object_notifyAll = getMemberMethod(ObjectClass, nme.notifyAll_)
def Object_equals = getMemberMethod(ObjectClass, nme.equals_)
def Object_hashCode = getMemberMethod(ObjectClass, nme.hashCode_)
def Object_toString = getMemberMethod(ObjectClass, nme.toString_)
// boxed classes
lazy val ObjectRefClass = requiredClass[scala.runtime.ObjectRef[_]]
lazy val VolatileObjectRefClass = requiredClass[scala.runtime.VolatileObjectRef[_]]
lazy val RuntimeStaticsModule = getRequiredModule("scala.runtime.Statics")
lazy val BoxesRunTimeModule = getRequiredModule("scala.runtime.BoxesRunTime")
lazy val BoxesRunTimeClass = BoxesRunTimeModule.moduleClass
lazy val BoxedNumberClass = getClassByName(sn.BoxedNumber)
lazy val BoxedCharacterClass = getClassByName(sn.BoxedCharacter)
lazy val BoxedBooleanClass = getClassByName(sn.BoxedBoolean)
lazy val Boxes_isNumberOrBool = getDecl(BoxesRunTimeClass, nme.isBoxedNumberOrBoolean)
lazy val Boxes_isNumber = getDecl(BoxesRunTimeClass, nme.isBoxedNumber)
lazy val BoxedUnitClass = requiredClass[scala.runtime.BoxedUnit]
lazy val BoxedUnitModule = getRequiredModule("scala.runtime.BoxedUnit")
def BoxedUnit_UNIT = getMemberValue(BoxedUnitModule, nme.UNIT)
def BoxedUnit_TYPE = getMemberValue(BoxedUnitModule, nme.TYPE_)
// Annotation base classes
lazy val AnnotationClass = requiredClass[scala.annotation.Annotation]
lazy val ClassfileAnnotationClass = requiredClass[scala.annotation.ClassfileAnnotation]
lazy val StaticAnnotationClass = requiredClass[scala.annotation.StaticAnnotation]
// Annotations
lazy val BridgeClass = requiredClass[scala.annotation.bridge]
lazy val ElidableMethodClass = requiredClass[scala.annotation.elidable]
lazy val ImplicitNotFoundClass = requiredClass[scala.annotation.implicitNotFound]
lazy val MigrationAnnotationClass = requiredClass[scala.annotation.migration]
lazy val ScalaStrictFPAttr = requiredClass[scala.annotation.strictfp]
lazy val SwitchClass = requiredClass[scala.annotation.switch]
lazy val TailrecClass = requiredClass[scala.annotation.tailrec]
lazy val VarargsClass = requiredClass[scala.annotation.varargs]
lazy val uncheckedStableClass = requiredClass[scala.annotation.unchecked.uncheckedStable]
lazy val uncheckedVarianceClass = requiredClass[scala.annotation.unchecked.uncheckedVariance]
lazy val BeanPropertyAttr = requiredClass[scala.beans.BeanProperty]
lazy val BooleanBeanPropertyAttr = requiredClass[scala.beans.BooleanBeanProperty]
lazy val CompileTimeOnlyAttr = getClassIfDefined("scala.reflect.macros.compileTimeOnly")
lazy val DeprecatedAttr = requiredClass[scala.deprecated]
lazy val DeprecatedNameAttr = requiredClass[scala.deprecatedName]
lazy val DeprecatedInheritanceAttr = requiredClass[scala.deprecatedInheritance]
lazy val DeprecatedOverridingAttr = requiredClass[scala.deprecatedOverriding]
lazy val NativeAttr = requiredClass[scala.native]
lazy val RemoteAttr = requiredClass[scala.remote]
lazy val ScalaInlineClass = requiredClass[scala.inline]
lazy val ScalaNoInlineClass = requiredClass[scala.noinline]
lazy val SerialVersionUIDAttr = requiredClass[scala.SerialVersionUID]
lazy val SpecializedClass = requiredClass[scala.specialized]
lazy val ThrowsClass = requiredClass[scala.throws[_]]
lazy val TransientAttr = requiredClass[scala.transient]
lazy val UncheckedClass = requiredClass[scala.unchecked]
lazy val UnspecializedClass = requiredClass[scala.annotation.unspecialized]
lazy val VolatileAttr = requiredClass[scala.volatile]
// Meta-annotations
lazy val BeanGetterTargetClass = requiredClass[meta.beanGetter]
lazy val BeanSetterTargetClass = requiredClass[meta.beanSetter]
lazy val FieldTargetClass = requiredClass[meta.field]
lazy val GetterTargetClass = requiredClass[meta.getter]
lazy val ParamTargetClass = requiredClass[meta.param]
lazy val SetterTargetClass = requiredClass[meta.setter]
lazy val ObjectTargetClass = requiredClass[meta.companionObject]
lazy val ClassTargetClass = requiredClass[meta.companionClass]
lazy val MethodTargetClass = requiredClass[meta.companionMethod] // TODO: module, moduleClass? package, packageObject?
lazy val LanguageFeatureAnnot = requiredClass[meta.languageFeature]
// Language features
lazy val languageFeatureModule = getRequiredModule("scala.languageFeature")
lazy val experimentalModule = getMemberModule(languageFeatureModule, nme.experimental)
lazy val MacrosFeature = getLanguageFeature("macros", experimentalModule)
lazy val DynamicsFeature = getLanguageFeature("dynamics")
lazy val PostfixOpsFeature = getLanguageFeature("postfixOps")
lazy val ReflectiveCallsFeature = getLanguageFeature("reflectiveCalls")
lazy val ImplicitConversionsFeature = getLanguageFeature("implicitConversions")
lazy val HigherKindsFeature = getLanguageFeature("higherKinds")
lazy val ExistentialsFeature = getLanguageFeature("existentials")
def isMetaAnnotation(sym: Symbol): Boolean = metaAnnotations(sym) || (
// Trying to allow for deprecated locations
sym.isAliasType && isMetaAnnotation(sym.info.typeSymbol)
)
lazy val metaAnnotations: Set[Symbol] = getPackage("scala.annotation.meta").info.members filter (_ isSubClass StaticAnnotationClass) toSet
// According to the scala.annotation.meta package object:
// * By default, annotations on (`val`-, `var`- or plain) constructor parameters
// * end up on the parameter, not on any other entity. Annotations on fields
// * by default only end up on the field.
def defaultAnnotationTarget(t: Tree): Symbol = t match {
case ClassDef(_, _, _, _) => ClassTargetClass
case ModuleDef(_, _, _) => ObjectTargetClass
case vd @ ValDef(_, _, _, _) if vd.symbol.isParamAccessor => ParamTargetClass
case vd @ ValDef(_, _, _, _) if vd.symbol.isValueParameter => ParamTargetClass
case ValDef(_, _, _, _) => FieldTargetClass
case DefDef(_, _, _, _, _, _) => MethodTargetClass
case _ => GetterTargetClass
}
lazy val AnnotationDefaultAttr: ClassSymbol = {
val attr = enterNewClass(RuntimePackageClass, tpnme.AnnotationDefaultATTR, List(AnnotationClass.tpe))
// This attribute needs a constructor so that modifiers in parsed Java code make sense
attr.info.decls enter attr.newClassConstructor(NoPosition)
attr
}
@deprecated("Moved to rootMirror.getClass", "2.10.0")
def getClass(fullname: Name): ClassSymbol = rootMirror.getClassByName(fullname)
@deprecated("Moved to rootMirror.getModule", "2.10.0")
def getModule(fullname: Name): ModuleSymbol = rootMirror.getModule(fullname)
private def fatalMissingSymbol(owner: Symbol, name: Name, what: String = "member") = {
throw new FatalError(owner + " does not have a " + what + " " + name)
}
def getLanguageFeature(name: String, owner: Symbol = languageFeatureModule): Symbol = getMember(owner, newTypeName(name))
def termMember(owner: Symbol, name: String): Symbol = owner.info.member(newTermName(name))
def findNamedMember(fullName: Name, root: Symbol): Symbol = {
val segs = nme.segments(fullName.toString, fullName.isTermName)
if (segs.isEmpty || segs.head != root.simpleName) NoSymbol
else findNamedMember(segs.tail, root)
}
def findNamedMember(segs: List[Name], root: Symbol): Symbol =
if (segs.isEmpty) root
else findNamedMember(segs.tail, root.info member segs.head)
def getMember(owner: Symbol, name: Name): Symbol = {
getMemberIfDefined(owner, name) orElse {
if (phase.flatClasses && name.isTypeName && !owner.isPackageObjectOrClass) {
val pkg = owner.owner
val flatname = nme.flattenedName(owner.name, name)
getMember(pkg, flatname)
}
else fatalMissingSymbol(owner, name)
}
}
def getMemberValue(owner: Symbol, name: Name): TermSymbol = {
getMember(owner, name.toTermName) match {
case x: TermSymbol => x
case _ => fatalMissingSymbol(owner, name, "member value")
}
}
def getMemberModule(owner: Symbol, name: Name): ModuleSymbol = {
getMember(owner, name.toTermName) match {
case x: ModuleSymbol => x
case _ => fatalMissingSymbol(owner, name, "member object")
}
}
def getTypeMember(owner: Symbol, name: Name): TypeSymbol = {
getMember(owner, name.toTypeName) match {
case x: TypeSymbol => x
case _ => fatalMissingSymbol(owner, name, "type member")
}
}
def getMemberClass(owner: Symbol, name: Name): ClassSymbol = {
getMember(owner, name.toTypeName) match {
case x: ClassSymbol => x
case _ => fatalMissingSymbol(owner, name, "member class")