diff options
Diffstat (limited to 'src/reflect/scala/reflect/internal/Definitions.scala')
| -rw-r--r-- | src/reflect/scala/reflect/internal/Definitions.scala | 149 |
1 files changed, 104 insertions, 45 deletions
diff --git a/src/reflect/scala/reflect/internal/Definitions.scala b/src/reflect/scala/reflect/internal/Definitions.scala index 69cdf5f04e..315af267bc 100644 --- a/src/reflect/scala/reflect/internal/Definitions.scala +++ b/src/reflect/scala/reflect/internal/Definitions.scala @@ -8,8 +8,9 @@ package reflect package internal import scala.language.postfixOps -import scala.annotation.{ switch, meta } -import scala.collection.{ mutable, immutable } + +import scala.annotation.meta +import scala.collection.mutable import Flags._ import scala.reflect.api.{Universe => ApiUniverse} @@ -80,7 +81,7 @@ trait Definitions extends api.StandardDefinitions { } } - private[Definitions] def classesMap[T](f: Name => T) = symbolsMap(ScalaValueClassesNoUnit, f) + private[Definitions] def classesMap[T](f: Name => T): Map[Symbol, 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) @@ -92,6 +93,13 @@ trait Definitions extends api.StandardDefinitions { 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 lazyHolders = symbolsMap(ScalaValueClasses, x => getClassIfDefined("scala.runtime.Lazy" + x)) + lazy val LazyRefClass = getClassIfDefined("scala.runtime.LazyRef") + lazy val LazyUnitClass = getClassIfDefined("scala.runtime.LazyUnit") + + lazy val allRefClasses: Set[Symbol] = { + refClass.values.toSet ++ volatileRefClass.values.toSet ++ Set(VolatileObjectRefClass, ObjectRefClass) + } def isNumericSubClass(sub: Symbol, sup: Symbol) = ( (numericWeight contains sub) @@ -233,6 +241,8 @@ trait Definitions extends api.StandardDefinitions { || tp =:= AnyRefTpe ) + def isUnitType(tp: Type) = tp.typeSymbol == UnitClass && tp.annotations.isEmpty + def hasMultipleNonImplicitParamLists(member: Symbol): Boolean = hasMultipleNonImplicitParamLists(member.info) def hasMultipleNonImplicitParamLists(info: Type): Boolean = info match { case PolyType(_, restpe) => hasMultipleNonImplicitParamLists(restpe) @@ -355,7 +365,6 @@ trait Definitions extends api.StandardDefinitions { // classes with special meanings lazy val StringAddClass = requiredClass[scala.runtime.StringAdd] 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) @@ -421,13 +430,15 @@ trait Definitions extends api.StandardDefinitions { def elementType(container: Symbol, tp: Type): Type = elementExtract(container, tp) // collections classes - lazy val ConsClass = requiredClass[scala.collection.immutable.::[_]] - lazy val IteratorClass = requiredClass[scala.collection.Iterator[_]] - lazy val IterableClass = requiredClass[scala.collection.Iterable[_]] - 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 ConsClass = requiredClass[scala.collection.immutable.::[_]] + lazy val IteratorClass = requiredClass[scala.collection.Iterator[_]] + lazy val IterableClass = requiredClass[scala.collection.Iterable[_]] + lazy val ListClass = requiredClass[scala.collection.immutable.List[_]] + lazy val SeqClass = requiredClass[scala.collection.Seq[_]] + lazy val JavaStringBuilderClass = requiredClass[java.lang.StringBuilder] + lazy val JavaStringBufferClass = requiredClass[java.lang.StringBuffer] + lazy val JavaCharSequenceClass = requiredClass[java.lang.CharSequence] + lazy val TraversableClass = requiredClass[scala.collection.Traversable[_]] lazy val ListModule = requiredModule[scala.collection.immutable.List.type] def List_apply = getMemberMethod(ListModule, nme.apply) @@ -452,6 +463,16 @@ trait Definitions extends api.StandardDefinitions { lazy val MethodCacheClass = requiredClass[scala.runtime.MethodCache] def methodCache_find = getMemberMethod(MethodCacheClass, nme.find_) def methodCache_add = getMemberMethod(MethodCacheClass, nme.add_) + lazy val StructuralCallSite = getClassIfDefined("scala.runtime.StructuralCallSite") + def StructuralCallSite_bootstrap = getMemberMethod(StructuralCallSite.linkedClassOfClass, sn.Bootstrap) + // Marker for invokedynamic runtime.StructuralCall.bootstrap + lazy val StructuralCallSite_dummy = NoSymbol.newMethodSymbol(nme.apply).setInfo(NullaryMethodType(StructuralCallSite.tpe)) + def StructuralCallSite_find = getMemberIfDefined(StructuralCallSite, nme.find_) + def StructuralCallSite_add = getMemberIfDefined(StructuralCallSite, nme.add_) + def StructuralCallSite_getParameterTypes = getMemberIfDefined(StructuralCallSite, nme.parameterTypes) + lazy val SymbolLiteral = getClassIfDefined("scala.runtime.SymbolLiteral") + def SymbolLiteral_bootstrap = getMemberIfDefined(SymbolLiteral.linkedClassOfClass, sn.Bootstrap) + def SymbolLiteral_dummy = NoSymbol.newMethodSymbol(nme.apply).setInfo(NullaryMethodType(SymbolModule.companionClass.tpe)) // XML lazy val ScalaXmlTopScope = getModuleIfDefined("scala.xml.TopScope") @@ -516,8 +537,8 @@ trait Definitions extends api.StandardDefinitions { lazy val ScalaSignatureAnnotation = requiredClass[scala.reflect.ScalaSignature] lazy val ScalaLongSignatureAnnotation = requiredClass[scala.reflect.ScalaLongSignature] - lazy val LambdaMetaFactory = getClassIfDefined("java.lang.invoke.LambdaMetafactory") - lazy val MethodHandle = getClassIfDefined("java.lang.invoke.MethodHandle") + lazy val MethodHandleClass = getClassIfDefined("java.lang.invoke.MethodHandle") + lazy val VarHandleClass = getClassIfDefined("java.lang.invoke.VarHandle") // Option classes lazy val OptionClass: ClassSymbol = requiredClass[Option[_]] @@ -657,6 +678,35 @@ trait Definitions extends api.StandardDefinitions { // Note that these call .dealiasWiden and not .normalize, the latter of which // tends to change the course of events by forcing types. def isFunctionType(tp: Type) = isFunctionTypeDirect(tp.dealiasWiden) + + // the number of arguments expected by the function described by `tp` (a FunctionN or SAM type), + // or `-1` if `tp` does not represent a function type or SAM + // for use during typers (after fields, samOf will be confused by abstract accessors for trait fields) + def functionArityFromType(tp: Type) = { + val dealiased = tp.dealiasWiden + if (isFunctionTypeDirect(dealiased)) dealiased.typeArgs.length - 1 + else samOf(tp) match { + case samSym if samSym.exists => samSym.info.params.length + case _ => -1 + } + } + + // the argument types expected by the function described by `tp` (a FunctionN or SAM type), + // or `Nil` if `tp` does not represent a function type or SAM (or if it happens to be Function0...) + def functionOrSamArgTypes(tp: Type): List[Type] = { + val dealiased = tp.dealiasWiden + if (isFunctionTypeDirect(dealiased)) dealiased.typeArgs.init + else samOf(tp) match { + case samSym if samSym.exists => tp.memberInfo(samSym).paramTypes + case _ => Nil + } + } + + // the SAM's parameters and the Function's formals must have the same length + // (varargs etc don't come into play, as we're comparing signatures, not checking an application) + def samMatchesFunctionBasedOnArity(sam: Symbol, formals: List[Any]): Boolean = + sam.exists && sameLength(sam.info.params, formals) + def isTupleType(tp: Type) = isTupleTypeDirect(tp.dealiasWiden) def tupleComponents(tp: Type) = tp.dealiasWiden.typeArgs @@ -670,12 +720,12 @@ trait Definitions extends api.StandardDefinitions { def productProj(z:Symbol, j: Int): TermSymbol = getMemberValue(z, nme.productAccessorName(j)) /** if tpe <: ProductN[T1,...,TN], returns List(T1,...,TN) else Nil */ - @deprecated("No longer used", "2.11.0") def getProductArgs(tpe: Type): List[Type] = tpe.baseClasses find isProductNSymbol match { + @deprecated("no longer used", "2.11.0") def getProductArgs(tpe: Type): List[Type] = tpe.baseClasses find isProductNSymbol match { case Some(x) => tpe.baseType(x).typeArgs case _ => Nil } - @deprecated("No longer used", "2.11.0") def unapplyUnwrap(tpe:Type) = tpe.finalResultType.dealiasWiden match { + @deprecated("no longer used", "2.11.0") def unapplyUnwrap(tpe:Type) = tpe.finalResultType.dealiasWiden match { case RefinedType(p :: _, _) => p.dealiasWiden case tp => tp } @@ -775,10 +825,6 @@ trait Definitions extends api.StandardDefinitions { private[this] var volatileRecursions: Int = 0 private[this] val pendingVolatiles = mutable.HashSet[Symbol]() - def abstractFunctionForFunctionType(tp: Type) = { - assert(isFunctionType(tp), tp) - abstractFunctionType(tp.typeArgs.init, tp.typeArgs.last) - } def functionNBaseType(tp: Type): Type = tp.baseClasses find isFunctionSymbol match { case Some(sym) => tp baseType unspecializedSymbol(sym) case _ => tp @@ -789,20 +835,29 @@ trait Definitions extends api.StandardDefinitions { (sym eq PartialFunctionClass) || (sym eq AbstractPartialFunctionClass) } + private[this] val doSam = settings.isScala212 || (settings.isScala211 && settings.Xexperimental) + /** The single abstract method declared by type `tp` (or `NoSymbol` if it cannot be found). * * The method must be monomorphic and have exactly one parameter list. * The class defining the method is a supertype of `tp` that - * has a public no-arg primary constructor. + * has a public no-arg primary constructor and it can be subclassed (not final or sealed). */ - def samOf(tp: Type): Symbol = if (!settings.Xexperimental) NoSymbol else { - // if tp has a constructor, it must be public and must not take any arguments - // (not even an implicit argument list -- to keep it simple for now) - val tpSym = tp.typeSymbol - val ctor = tpSym.primaryConstructor - val ctorOk = !ctor.exists || (!ctor.isOverloaded && ctor.isPublic && ctor.info.params.isEmpty && ctor.info.paramSectionCount <= 1) - - if (tpSym.exists && ctorOk) { + def samOf(tp: Type): Symbol = if (!doSam) NoSymbol else if (!isNonRefinementClassType(unwrapToClass(tp))) NoSymbol else { + // look at erased type because we (only) care about what ends up in bytecode + // (e.g., an alias type is fine as long as is compiles to a single-abstract-method) + val tpSym: Symbol = erasure.javaErasure(tp).typeSymbol + + if (tpSym.exists && tpSym.isClass && !(tpSym hasFlag (FINAL | SEALED)) + // if tp has a constructor (its class is not a trait), it must be public and must not take any arguments + // (implementation restriction: implicit argument lists are excluded to simplify type inference in adaptToSAM) + && { val ctor = tpSym.primaryConstructor + !ctor.exists || (!ctor.isOverloaded && ctor.isPublic && ctor.info.params.isEmpty && ctor.info.paramSectionCount <= 1)} + // we won't be able to create an instance of tp if it doesn't correspond to its self type + // (checking conformance gets complicated when tp is not fully defined, so let's just rule out self types entirely) + && !tpSym.hasSelfType + ) { + // find the single abstract member, if there is one // don't go out requiring DEFERRED members, as you will get them even if there's a concrete override: // scala> abstract class X { def m: Int } @@ -814,12 +869,13 @@ trait Definitions extends api.StandardDefinitions { // Scopes() // must filter out "universal" members (getClass is deferred for some reason) val deferredMembers = ( - tp membersBasedOnFlags (excludedFlags = BridgeAndPrivateFlags, requiredFlags = METHOD) - filter (mem => mem.isDeferredNotJavaDefault && !isUniversalMember(mem)) // TODO: test + tp.membersBasedOnFlags(excludedFlags = BridgeAndPrivateFlags, requiredFlags = METHOD).toList.filter( + mem => mem.isDeferred && !isUniversalMember(mem) + ) // TODO: test ) // if there is only one, it's monomorphic and has a single argument list - if (deferredMembers.size == 1 && + if (deferredMembers.lengthCompare(1) == 0 && deferredMembers.head.typeParams.isEmpty && deferredMembers.head.info.paramSectionCount == 1) deferredMembers.head @@ -901,7 +957,6 @@ trait Definitions extends api.StandardDefinitions { def neverHasTypeParameters(sym: Symbol) = sym match { case _: RefinementClassSymbol => true case _: ModuleClassSymbol => true - case _: ImplClassSymbol => true case _ => ( sym.isPrimitiveValueClass @@ -920,10 +975,10 @@ trait Definitions extends api.StandardDefinitions { } /** Given a class symbol C with type parameters T1, T2, ... Tn - * which have upper/lower bounds LB1/UB1, LB1/UB2, ..., LBn/UBn, + * which have upper/lower bounds LB1/UB1, LB2/UB2, ..., LBn/UBn, * returns an existential type of the form * - * C[E1, ..., En] forSome { E1 >: LB1 <: UB1 ... en >: LBn <: UBn }. + * C[E1, ..., En] forSome { E1 >: LB1 <: UB1 ... En >: LBn <: UBn }. */ def classExistentialType(prefix: Type, clazz: Symbol): Type = { val eparams = typeParamsToExistentials(clazz, clazz.unsafeTypeParams) @@ -996,11 +1051,7 @@ trait Definitions extends api.StandardDefinitions { } } - /** 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 @@ -1099,6 +1150,7 @@ trait Definitions extends api.StandardDefinitions { lazy val BridgeClass = requiredClass[scala.annotation.bridge] lazy val ElidableMethodClass = requiredClass[scala.annotation.elidable] lazy val ImplicitNotFoundClass = requiredClass[scala.annotation.implicitNotFound] + lazy val ImplicitAmbiguousClass = getClassIfDefined("scala.annotation.implicitAmbiguous") lazy val MigrationAnnotationClass = requiredClass[scala.annotation.migration] lazy val ScalaStrictFPAttr = requiredClass[scala.annotation.strictfp] lazy val SwitchClass = requiredClass[scala.annotation.switch] @@ -1140,6 +1192,8 @@ trait Definitions extends api.StandardDefinitions { lazy val MethodTargetClass = requiredClass[meta.companionMethod] // TODO: module, moduleClass? package, packageObject? lazy val LanguageFeatureAnnot = requiredClass[meta.languageFeature] + lazy val JUnitAnnotations = List("Test", "Ignore", "Before", "After", "BeforeClass", "AfterClass").map(n => getClassIfDefined("org.junit." + n)) + // Language features lazy val languageFeatureModule = getRequiredModule("scala.languageFeature") @@ -1363,6 +1417,8 @@ trait Definitions extends api.StandardDefinitions { case _ => false } + lazy val ShowAsInfixAnnotationClass = rootMirror.getClassIfDefined("scala.annotation.showAsInfix") + // todo: reconcile with javaSignature!!! def signature(tp: Type): String = { def erasure(tp: Type): Type = tp match { @@ -1389,8 +1445,8 @@ trait Definitions extends api.StandardDefinitions { if (isInitialized) return ObjectClass.initialize ScalaPackageClass.initialize - val forced1 = symbolsNotPresentInBytecode - val forced2 = NoSymbol + symbolsNotPresentInBytecode + NoSymbol isInitialized = true } //init @@ -1415,6 +1471,7 @@ trait Definitions extends api.StandardDefinitions { lazy val StringAdd_+ = getMemberMethod(StringAddClass, nme.PLUS) // The given symbol represents either String.+ or StringAdd.+ + // TODO: this misses Predef.any2stringadd def isStringAddition(sym: Symbol) = sym == String_+ || sym == StringAdd_+ lazy val StringContext_f = getMemberMethod(StringContextClass, nme.f) @@ -1509,12 +1566,14 @@ trait Definitions extends api.StandardDefinitions { lazy val PartialManifestClass = getTypeMember(ReflectPackage, tpnme.ClassManifest) lazy val ManifestSymbols = Set[Symbol](PartialManifestClass, FullManifestClass, OptManifestClass) + private lazy val PolymorphicSignatureClass = MethodHandleClass.companionModule.info.decl(TypeName("PolymorphicSignature")) - def isPolymorphicSignature(sym: Symbol) = PolySigMethods(sym) - private lazy val PolySigMethods: Set[Symbol] = Set[Symbol](MethodHandle.info.decl(sn.Invoke), MethodHandle.info.decl(sn.InvokeExact)).filter(_.exists) + def isPolymorphicSignature(sym: Symbol) = sym != null && sym.isJavaDefined && { + val owner = sym.safeOwner + (owner == MethodHandleClass || owner == VarHandleClass) && sym.hasAnnotation(PolymorphicSignatureClass) + } - lazy val Scala_Java8_CompatPackage = rootMirror.getPackageIfDefined("scala.compat.java8") - lazy val Scala_Java8_CompatPackage_JFunction = (0 to MaxFunctionArity).toArray map (i => getMemberIfDefined(Scala_Java8_CompatPackage.moduleClass, TypeName("JFunction" + i))) + lazy val Scala_Java8_CompatPackage = rootMirror.getPackageIfDefined("scala.runtime.java8") } } } |