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package dotty.tools.dotc.transform
import dotty.tools.dotc.ast.tpd
import dotty.tools.dotc.core.Contexts.Context
import dotty.tools.dotc.core.DenotTransformers.{SymTransformer, DenotTransformer}
import dotty.tools.dotc.core.Denotations.SingleDenotation
import dotty.tools.dotc.core.Phases.Phase
import dotty.tools.dotc.core.StdNames._
import dotty.tools.dotc.core.SymDenotations.SymDenotation
import dotty.tools.dotc.core._
import dotty.tools.dotc.transform.TreeTransforms.{MiniPhaseTransform, TransformerInfo}
/***
* Renames constructors in traits so that backend will call them with invokeInterface
* Also makes sure that renamed constructor bodies conforms to type of method
*/
class TraitConstructors extends MiniPhaseTransform with SymTransformer {
import dotty.tools.dotc.ast.tpd._
def phaseName: String = "traitConstructors"
override def treeTransformPhase: Phase = this.phase
def transformSym(sym: SymDenotation)(implicit ctx: Context): SymDenotation = {
if(sym.isPrimaryConstructor && (sym.owner is Flags.Trait))
sym.copySymDenotation(name = nme.INITIALIZER_PREFIX ++ sym.owner.fullName)
else sym
}
override def transformDefDef(tree: tpd.DefDef)(implicit ctx: Context, info: TransformerInfo): tpd.Tree = {
val sym = tree.symbol
if (sym.isPrimaryConstructor && (sym.owner is Flags.Trait))
cpy.DefDef(tree)(rhs = Block(List(tree.rhs), This(tree.symbol.enclosingClass.asClass)))
else tree
}
}
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