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package scala.reflect.reify
package codegen
trait Types {
self: Reifier =>
import mirror._
import definitions._
import treeInfo._
/**
* Reify a type.
* For internal use only, use ``reified'' instead.
*/
def reifyType(tpe0: Type): Tree = {
assert(tpe0 != null, "tpe is null")
val tpe = tpe0.dealias
if (tpe.isErroneous)
CannotReifyErroneousReifee(tpe)
if (tpe.isLocalToReifee)
CannotReifyType(tpe)
// [Eugene] how do I check that the substitution is legal w.r.t tpe.info?
val spliced = spliceType(tpe)
if (spliced != EmptyTree)
return spliced
val tsym = tpe.typeSymbol
if (tsym.isClass && tpe == tsym.typeConstructor && tsym.isStatic)
Select(reify(tpe.typeSymbol), nme.asTypeConstructor)
else tpe match {
case tpe @ NoType =>
reifyMirrorObject(tpe)
case tpe @ NoPrefix =>
reifyMirrorObject(tpe)
case tpe @ ThisType(root) if root == RootClass =>
mirrorSelect("definitions.RootClass.thisPrefix")
case tpe @ ThisType(empty) if empty == EmptyPackageClass =>
mirrorSelect("definitions.EmptyPackageClass.thisPrefix")
case tpe @ ThisType(clazz) if clazz.isModuleClass && clazz.isStatic =>
mirrorCall(nme.thisModuleType, reify(clazz.fullName))
case tpe @ ThisType(_) =>
reifyProduct(tpe)
case tpe @ SuperType(thistpe, supertpe) =>
reifyProduct(tpe)
case tpe @ SingleType(pre, sym) =>
reifyProduct(tpe)
case tpe @ ConstantType(value) =>
mirrorFactoryCall(nme.ConstantType, reifyProduct(value))
case tpe @ TypeRef(pre, sym, args) =>
reifyProduct(tpe)
case tpe @ TypeBounds(lo, hi) =>
reifyProduct(tpe)
case tpe @ NullaryMethodType(restpe) =>
reifyProduct(tpe)
case tpe @ AnnotatedType(anns, underlying, selfsym) =>
reifyAnnotatedType(tpe)
case _ =>
reifyToughType(tpe)
}
}
/** An obscure flag necessary for implicit TypeTag generation */
private var spliceTypesEnabled = !dontSpliceAtTopLevel
/** Keeps track of whether this reification contains abstract type parameters */
private var _definitelyConcrete = true
def definitelyConcrete = _definitelyConcrete
def definitelyConcrete_=(value: Boolean) {
_definitelyConcrete = value
if (!value && requireConcreteTypeTag) {
assert(current.isInstanceOf[Type], current)
val offender = current.asInstanceOf[Type]
CannotReifyConcreteTypeTagHavingUnresolvedTypeParameters(offender)
}
}
private type SpliceCacheKey = (Symbol, Symbol)
private lazy val spliceCache: collection.mutable.Map[SpliceCacheKey, Tree] = {
val cache = analyzer.perRunMacroCache.getOrElseUpdate(MacroContextReify, collection.mutable.Map[Any, Any]())
cache.getOrElseUpdate("spliceCache", collection.mutable.Map[SpliceCacheKey, Tree]()).asInstanceOf[collection.mutable.Map[SpliceCacheKey, Tree]]
}
def spliceType(tpe: Type): Tree = {
// [Eugene] it seems that depending on the context the very same symbol can be either a spliceable tparam or a quantified existential. very weird!
val quantified = currents collect { case ExistentialType(quantified, _) => quantified } flatMap identity
if (tpe.isSpliceable && !(quantified contains tpe.typeSymbol)) {
if (reifyDebug) println("splicing " + tpe)
if (spliceTypesEnabled) {
var tagClass = if (requireConcreteTypeTag) ConcreteTypeTagClass else TypeTagClass
val tagTpe = singleType(prefix.tpe, prefix.tpe member tagClass.name)
// [Eugene] this should be enough for an abstract type, right?
val key = (tagClass, tpe.typeSymbol)
if (reifyDebug && spliceCache.contains(key)) println("cache hit: " + spliceCache(key))
val result = spliceCache.getOrElseUpdate(key, {
// if this fails, it might produce the dreaded "erroneous or inaccessible type" error
// to find out the whereabouts of the error run scalac with -Ydebug
if (reifyDebug) println("launching implicit search for %s.%s[%s]".format(prefix, tagClass.name, tpe))
typer.resolveTypeTag(positionBearer, prefix.tpe, tpe, requireConcreteTypeTag) match {
case failure if failure.isEmpty =>
if (reifyDebug) println("implicit search was fruitless")
EmptyTree
case success =>
if (reifyDebug) println("implicit search has produced a result: " + success)
definitelyConcrete &= requireConcreteTypeTag
var splice = Select(success, nme.tpe)
splice match {
case InlinedTypeSplice(_, inlinedSymbolTable, tpe) =>
// all free vars local to the enclosing reifee should've already been inlined by ``Metalevels''
inlinedSymbolTable collect { case freedef @ FreeDef(_, _, binding, _, _) if binding.symbol.isLocalToReifee => assert(false, freedef) }
symbolTable ++= inlinedSymbolTable
reifyTrace("inlined the splicee: ")(tpe)
case tpe =>
tpe
}
}
})
if (result != EmptyTree) return result.duplicate
} else {
if (reifyDebug) println("splicing has been cancelled: spliceTypesEnabled = false")
}
definitelyConcrete = false
}
spliceTypesEnabled = true
EmptyTree
}
/** Reify an annotated type, i.e. the one that makes us deal with AnnotationInfos */
private def reifyAnnotatedType(tpe: AnnotatedType): Tree = {
val AnnotatedType(anns, underlying, selfsym) = tpe
mirrorFactoryCall(nme.AnnotatedType, mkList(anns map reifyAnnotationInfo), reify(underlying), reify(selfsym))
}
/** Reify a tough type, i.e. the one that leads to creation of auxiliary symbols */
private def reifyToughType(tpe: Type): Tree = {
if (reifyDebug) println("tough type: %s (%s)".format(tpe, tpe.kind))
def reifyScope(scope: Scope): Tree = {
scope foreach reifySymDef
mirrorCall(nme.newScopeWith, scope.toList map reify: _*)
}
tpe match {
case tpe @ RefinedType(parents, decls) =>
reifySymDef(tpe.typeSymbol)
mirrorFactoryCall(tpe, reify(parents), reifyScope(decls), reify(tpe.typeSymbol))
case tpe @ ExistentialType(tparams, underlying) =>
tparams foreach reifySymDef
mirrorFactoryCall(tpe, reify(tparams), reify(underlying))
case tpe @ ClassInfoType(parents, decls, clazz) =>
reifySymDef(clazz)
mirrorFactoryCall(tpe, reify(parents), reifyScope(decls), reify(tpe.typeSymbol))
case tpe @ MethodType(params, restpe) =>
params foreach reifySymDef
mirrorFactoryCall(tpe, reify(params), reify(restpe))
case tpe @ PolyType(tparams, underlying) =>
tparams foreach reifySymDef
mirrorFactoryCall(tpe, reify(tparams), reify(underlying))
case _ =>
throw new Error("internal error: %s (%s) is not supported".format(tpe, tpe.kind))
}
}
}
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