Upgrade to Scala 3.4.0 and support its TASTy format.

Changes notably include: * Handling `Lambda`s that are poly functions. * Weakening a test affected by scalacenter#436.
sjrd · Feb 20, 2024 · acc2856 · acc2856
1 parent 1a61e54
commit acc2856
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Showing 8 changed files with 54 additions and 58 deletions.
diff --git a/build.sbt b/build.sbt
@@ -3,7 +3,7 @@ import sbt.internal.util.ManagedLogger
 
 import org.scalajs.jsenv.nodejs.NodeJSEnv
 
-val usedScalaCompiler = "3.3.1"
+val usedScalaCompiler = "3.4.0"
 val usedTastyRelease = usedScalaCompiler
 val scala2Version = "2.13.12"
 

diff --git a/tasty-query/shared/src/main/scala/tastyquery/Trees.scala b/tasty-query/shared/src/main/scala/tastyquery/Trees.scala
@@ -527,21 +527,32 @@ object Trees {
         tpt.toType
 
       case None =>
-        val methodType = meth.tpe.widenTermRef match
-          case mt: MethodType if !mt.resultType.isInstanceOf[MethodicType] =>
-            mt
-          case mt =>
-            throw InvalidProgramStructureException(s"Unexpected type for the `meth` part of a Lambda: $mt")
-
-        val paramCount = methodType.paramNames.size
-        val functionNTypeRef = defn.FunctionNClass(paramCount).staticRef
-
-        if methodType.isResultDependent then
-          val parent = functionNTypeRef.appliedTo(List.fill(paramCount + 1)(defn.AnyType))
-          TermRefinement(parent, isStable = false, nme.m_apply, methodType)
-        else functionNTypeRef.appliedTo(methodType.paramTypes :+ methodType.resultType.asInstanceOf[Type])
+        convertMethodTypeToFunctionType(meth.tpe.widenTermRef)
     end calculateType
 
+    private def convertMethodTypeToFunctionType(tpe: TermType)(using Context): Type =
+      tpe match
+        case tpe: MethodType if tpe.resultType.isInstanceOf[Type] =>
+          val paramCount = tpe.paramNames.size
+          val functionNTypeRef = defn.FunctionNClass(paramCount).staticRef
+
+          if tpe.isResultDependent then
+            val parent = functionNTypeRef.appliedTo(List.fill(paramCount + 1)(defn.AnyType))
+            TermRefinement(parent, isStable = false, nme.m_apply, tpe)
+          else functionNTypeRef.appliedTo(tpe.paramTypes :+ tpe.resultType.asInstanceOf[Type])
+
+        case tpe: PolyType if tpe.resultType.isInstanceOf[MethodType] =>
+          val polyFunctionClass = defn.PolyFunctionClass.getOrElse {
+            throw InvalidProgramStructureException(
+              s"Found a polymorphic Lambda but PolyFunction is not on the classpath"
+            )
+          }
+          TermRefinement(polyFunctionClass.staticRef, isStable = false, nme.m_apply, tpe)
+
+        case _ =>
+          throw InvalidProgramStructureException(s"Unexpected type for the `meth` part of a Lambda: ${tpe.showBasic}")
+    end convertMethodTypeToFunctionType
+
     /** The class symbol of the SAM type of this lambda.
       *
       * A `Lambda` can be considered as an anonymous class of the form `new tpt { ... }`.

diff --git a/tasty-query/shared/src/main/scala/tastyquery/reader/tasties/TastyFormat.scala b/tasty-query/shared/src/main/scala/tastyquery/reader/tasties/TastyFormat.scala
@@ -289,7 +289,7 @@ private[tasties] object TastyFormat:
     * compatibility, but remains backwards compatible, with all
     * preceeding `MinorVersion`.
     */
-  final val MinorVersion: Int = 3
+  final val MinorVersion: Int = 4
 
   /** Natural Number. The `ExperimentalVersion` allows for
     * experimentation with changes to TASTy without committing

diff --git a/tasty-query/shared/src/test/scala/tastyquery/PositionSuite.scala b/tasty-query/shared/src/test/scala/tastyquery/PositionSuite.scala
@@ -151,7 +151,7 @@ class PositionSuite extends RestrictedUnpicklingSuite {
         "(x: Int) => x + 1",
         "() => ()",
         "T] => T => T", // TODO Improve this
-        "T] => (x: T) => x", // TODO Improve this
+        "[T] => (x: T) => x",
         "(x: Any) => x.type",
         "x => x"
       )

diff --git a/tasty-query/shared/src/test/scala/tastyquery/ReadTreeSuite.scala b/tasty-query/shared/src/test/scala/tastyquery/ReadTreeSuite.scala
@@ -631,22 +631,25 @@ class ReadTreeSuite extends RestrictedUnpicklingSuite {
     val test1Def = findTree(tree) { case test1Def @ DefDef(SimpleName("test1"), _, _, _, _) =>
       test1Def
     }
+    val matchTree = findTree(test1Def) { case mt: Match =>
+      mt
+    }
 
     val forExpressionMatch1: StructureCheck = {
       case CaseDef(
             Unapply(
               TypeApply(Select(Ident(SimpleName("Tuple2")), SignedName(SimpleName("unapply"), _, _)), _),
               Nil,
               List(
-                Bind(i, WildcardPattern(TypeRefInternal(_, SimpleTypeName("Int"))), _),
+                Bind(SimpleName("i"), WildcardPattern(TypeRefInternal(_, SimpleTypeName("Int"))), _),
                 WildcardPattern(TypeRefInternal(_, SimpleTypeName("String")))
               )
             ),
             None,
-            Literal(Constant(true))
+            _
           ) =>
     }
-    assert(containsSubtree(forExpressionMatch1)(clue(test1Def)))
+    assert(containsSubtree(forExpressionMatch1)(clue(matchTree)))
   }
 
   testUnpickle("singletonType", "simple_trees.SingletonType") { tree =>
@@ -959,50 +962,25 @@ class ReadTreeSuite extends RestrictedUnpicklingSuite {
             Some(
               Block(
                 List(
-                  ClassDef(
-                    _,
-                    Template(
-                      _,
-                      List(
-                        Apply(Select(New(TypeWrapper(_)), _), List()),
-                        TypeWrapper(TypeRefInternal(_, SimpleTypeName("PolyFunction")))
-                      ),
-                      None,
-                      List(
-                        DefDef(
-                          SimpleName("apply"),
-                          List(
-                            Right(List(TypeParam(SimpleTypeName("T"), _, _))),
-                            Left(List(ValDef(SimpleName("x"), TypeIdent(SimpleTypeName("T")), None, _)))
-                          ),
-                          TypeIdent(SimpleTypeName("T")),
-                          Some(Ident(SimpleName("x"))),
-                          _
-                        )
-                      )
+                  DefDef(
+                    SimpleName("$anonfun"),
+                    List(
+                      Right(List(TypeParam(SimpleTypeName("T"), _, _))),
+                      Left(List(ValDef(SimpleName("x"), _, _, _)))
                     ),
-                    _
+                    _,
+                    _,
+                    defSym
                   )
                 ),
-                Typed(
-                  Apply(Select(New(TypeIdent(_)), _), List()),
-                  TypeWrapper(
-                    ty.TermRefinement(
-                      TypeRefInternal(_, SimpleTypeName("PolyFunction")),
-                      SimpleName("apply"),
-                      polyType @ ty.PolyType(
-                        List(SimpleTypeName("T") -> _),
-                        ty.MethodType(List(SimpleName("x") -> (tref1: TypeParamRef)), tref2: TypeParamRef)
-                      )
-                    )
-                  )
-                )
+                Lambda(defRef @ Ident(SimpleName("$anonfun")), None)
               )
             ),
             _
-          ) if Seq(tref1, tref2).forall(tref => (tref.binder eq polyType) && tref.paramNum == 0) =>
+          ) if defRef.symbol == defSym =>
     }
-    assert(containsSubtree(polyIDMatch)(clue(tree)))
+    val polyIDVal = findValDefTree(tree, termName("polyID"))
+    assert(containsSubtree(polyIDMatch)(clue(polyIDVal)))
 
     val dependentIDMatch: StructureCheck = {
       case ValDef(

diff --git a/tasty-query/shared/src/test/scala/tastyquery/TestUtils.scala b/tasty-query/shared/src/test/scala/tastyquery/TestUtils.scala
@@ -19,6 +19,12 @@ object TestUtils:
     }
   end findLocalValDef
 
+  def findValDefTree(body: Tree, name: TermName): ValDef =
+    findTree(body) {
+      case vd: ValDef if vd.name == name => vd
+    }
+  end findValDefTree
+
   def findTree[A](body: Tree)(test: PartialFunction[Tree, A]): A =
     object finder extends TreeTraverser:
       var result: Option[A] = None

diff --git a/tasty-query/shared/src/test/scala/tastyquery/TypeSuite.scala b/tasty-query/shared/src/test/scala/tastyquery/TypeSuite.scala
@@ -2728,7 +2728,8 @@ class TypeSuite extends UnrestrictedUnpicklingSuite {
     testTypeApply("testAsInstanceOfInt", nme.m_asInstanceOf, _.isRef(defn.IntClass))
     testTypeApply("testAsInstanceOfProduct", nme.m_asInstanceOf, _.isRef(ProductClass))
 
-    testTypeApply("testTypeCast", termName("$asInstanceOf$"), _.isRef(defn.IntClass))
+    // FIXME #436: the type test should be _.widenTermRef.isRef(defn.IntClass)
+    testTypeApply("testTypeCast", termName("$asInstanceOf$"), _.isInstanceOf[TermRef])
 
     testApplyTypeApply(
       "testGetClassAny",

diff --git a/test-sources/src/main/scala/simple_trees/AnyMethods.scala b/test-sources/src/main/scala/simple_trees/AnyMethods.scala
@@ -18,7 +18,7 @@ class AnyMethods:
 
   class Bag extends scala.reflect.Selectable
 
-  def testTypeCast(bag: Bag { val m: Int }): Any = bag.m // bag.selectDynamic("m").$asInstanceOf$[Int]
+  def testTypeCast(bag: Bag { val m: Int }): Any = bag.m // bag.selectDynamic("m").$asInstanceOf$[bag.m.type]
 
   def testGetClassAny(x: Any): Any = x.getClass()
   def testGetClassProduct(x: Product): Class[? <: Product] = x.getClass()