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package dotty.tools.dotc
package transform
import core._
import TreeTransforms._
import Contexts.Context
import Flags._
import SymUtils._
import Symbols._
import SymDenotations._
import Types._
import Decorators._
import DenotTransformers._
import StdNames._
import NameOps._
import ast.Trees._
import dotty.tools.dotc.ast.tpd
import util.Positions._
import Names._
import collection.mutable
import ResolveSuper._
/** This phase rewrites calls to array constructors to newArray and newGenericArray methods
* in Dotty.runtime.Arrays module.
*
* Additionally it optimizes calls to scala.Array.ofDim functions
*
*/
class ArrayConstructors extends MiniPhaseTransform { thisTransform =>
import ast.tpd._
override def phaseName: String = "arrayConstructors"
override def transformApply(tree: tpd.Apply)(implicit ctx: Context, info: TransformerInfo): tpd.Tree = {
def rewrite(elemType: Type, dims: List[Tree]) =
tpd.newArray(elemType, tree.tpe, tree.pos, JavaSeqLiteral(dims, TypeTree(defn.IntClass.typeRef)))
if (tree.fun.symbol eq defn.ArrayConstructor) {
tree.fun match {
case TypeApply(tycon, targ :: Nil) =>
rewrite(targ.tpe, tree.args)
case _ =>
???
}
} else if ((tree.fun.symbol.maybeOwner eq defn.ArrayModule) && (tree.fun.symbol.name eq nme.ofDim) && !tree.tpe.isInstanceOf[MethodicType]) {
tree.fun match {
case Apply(TypeApply(t: Ident, targ), dims) =>
rewrite(targ.head.tpe, dims)
case Apply(TypeApply(t: Select, targ), dims) =>
Block(t.qualifier :: Nil, rewrite(targ.head.tpe, dims))
case _ => tree
}
} else tree
}
}
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