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package dotty.tools.dotc
package transform
import TreeTransforms._
import core.DenotTransformers._
import core.Denotations._
import core.SymDenotations._
import core.Contexts._
import core.Symbols._
import core.Types._
import core.Constants._
import core.StdNames._
import core.Decorators._
import core.transform.Erasure.isUnboundedGeneric
import typer._
import typer.ErrorReporting._
import ast.Trees._
import ast.{tpd, untpd}
/** This transform eliminates patterns. Right now it's a dummy.
* Awaiting the real pattern matcher.
*/
class TreeChecker {
import ast.tpd._
def check(ctx: Context) = {
println(s"checking ${ctx.compilationUnit} after phase ${ctx.phase.prev}")
Checker.typedExpr(ctx.compilationUnit.tpdTree)(ctx)
}
object Checker extends ReTyper {
override def typed(tree: untpd.Tree, pt: Type)(implicit ctx: Context) =
if (tree.isEmpty) tree.asInstanceOf[Tree]
else {
assert(tree.hasType, tree.show)
val tree1 = super.typed(tree, pt)
def sameType(tp1: Type, tp2: Type) =
(tp1 eq tp2) || // accept NoType / NoType
(tp1 =:= tp2)
def divergenceMsg =
s"""Types differ
|Original type : ${tree.typeOpt.show}
|After checking: ${tree1.tpe.show}
|Original tree : ${tree.show}
|After checking: ${tree1.show}
""".stripMargin
assert(sameType(tree1.tpe, tree.typeOpt), divergenceMsg)
tree1
}
override def typedIdent(tree: untpd.Ident, pt: Type)(implicit ctx: Context): Tree = {
assert(tree.isTerm, tree.show)
super.typedIdent(tree, pt)
}
override def typedSelect(tree: untpd.Select, pt: Type)(implicit ctx: Context): Tree = {
assert(tree.isTerm, tree.show)
super.typedSelect(tree, pt)
}
}
}
object TreeChecker extends TreeChecker
|
