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package dotty.tools.dotc
package transform
import ast.tpd
import core.Contexts.Context
import core.StdNames.nme
import core.Symbols.TermSymbol
import core.Phases.Phase
import TreeTransforms.{MiniPhaseTransform, TransformerInfo}
/** Rewrite `getClass` calls as follow:
*
* For every instance of primitive class C whose boxed class is called B:
* instanceC.getClass -> B.TYPE
* For every instance of non-primitive class D:
* instanceD.getClass -> instanceD.getClass
*/
class GetClass extends MiniPhaseTransform {
import tpd._
override def phaseName: String = "getClass"
override def runsAfter: Set[Class[_ <: Phase]] = Set(classOf[Erasure])
override def transformApply(tree: Apply)(implicit ctx: Context, info: TransformerInfo): Tree = {
import ast.Trees._
tree match {
case Apply(Select(qual, nme.getClass_), Nil) =>
val defn = ctx.definitions
val claz = qual.tpe.classSymbol
def TYPE(module: TermSymbol) = ref(module).select(nme.TYPE_).ensureConforms(tree.tpe)
claz match {
case defn.BooleanClass => TYPE(defn.BoxedBooleanModule)
case defn.ByteClass => TYPE(defn.BoxedByteModule)
case defn.ShortClass => TYPE(defn.BoxedShortModule)
case defn.CharClass => TYPE(defn.BoxedCharModule)
case defn.IntClass => TYPE(defn.BoxedIntModule)
case defn.LongClass => TYPE(defn.BoxedLongModule)
case defn.FloatClass => TYPE(defn.BoxedFloatModule)
case defn.DoubleClass => TYPE(defn.BoxedDoubleModule)
case defn.UnitClass => TYPE(defn.BoxedVoidModule)
case _ => tree
}
case _ => tree
}
}
}
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