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package dotty.tools.dotc
package transform
import core._
import Contexts.Context
import Types._
import TreeTransforms._
import Decorators._
import ast.Trees._
import Flags._
/** Transform references of the form
*
* C.this.m
*
* where `C` is a class with explicit self type and `C` is not a
* subclass of the owner of `m` to
*
* C.this.asInstanceOf[S & C.this.type].m
*
* where `S` is the self type of `C`.
* See run/i789.scala for a test case why this is needed.
*
* Also replaces idents referring to the self type with ThisTypes.
*/
class ExplicitSelf extends MiniPhaseTransform { thisTransform =>
import ast.tpd._
override def phaseName = "explicitSelf"
override def transformIdent(tree: Ident)(implicit ctx: Context, info: TransformerInfo) = tree.tpe match {
case tp: ThisType =>
ctx.debuglog(s"owner = ${ctx.owner}, context = ${ctx}")
This(tp.cls) withPos tree.pos
case _ => tree
}
override def transformSelect(tree: Select)(implicit ctx: Context, info: TransformerInfo): Tree = tree match {
case Select(thiz: This, name) if name.isTermName =>
val cls = thiz.symbol.asClass
val cinfo = cls.classInfo
if (cinfo.givenSelfType.exists && !cls.derivesFrom(tree.symbol.owner))
cpy.Select(tree)(thiz.asInstance(AndType(cinfo.selfType, thiz.tpe)), name)
else tree
case _ => tree
}
}
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