Fix :require adding classes/pkgs

Author: dwijnand

Diff for: compiler/src/dotty/tools/dotc/classpath/AggregateClassPath.scala

@@ -33,11 +33,7 @@ case class AggregateClassPath(aggregates: Seq[ClassPath]) extends ClassPath {
     packageIndex.getOrElseUpdate(pkg.dottedString, aggregates.filter(_.hasPackage(pkg)))
   }
 
-  override def asURLs: Seq[URL] =
-    aggregates.flatMap {
-      case v: VirtualDirectoryClassPath => Seq()
-      case a => a.asURLs
-    }
+  override def asURLs: Seq[URL] = aggregates.flatMap(_.asURLs)
 
   override def asClassPathStrings: Seq[String] = aggregates.map(_.asClassPathString).distinct
 

Diff for: compiler/src/dotty/tools/dotc/config/JavaPlatform.scala

@@ -33,8 +33,9 @@ class JavaPlatform extends Platform {
     case cp: ClassPath =>
       currentClassPath = Some(AggregateClassPath(cp :: cPath :: Nil))
   }
+
   /** Update classpath with a substituted subentry */
-  def updateClassPath(subst: Map[ClassPath, ClassPath])(using Context): Unit = classPath match {
+  def updateClassPath(subst: Map[ClassPath, ClassPath]): Unit = currentClassPath.get match {
     case AggregateClassPath(entries) =>
       currentClassPath = Some(AggregateClassPath(entries map (e => subst.getOrElse(e, e))))
     case cp: ClassPath =>

Diff for: compiler/src/dotty/tools/dotc/config/Platform.scala

@@ -19,7 +19,7 @@ abstract class Platform {
   def classPath(using Context): ClassPath
 
   /** Update classpath with a substitution that maps entries to entries */
-  def updateClassPath(subst: Map[ClassPath, ClassPath])(using Context): Unit
+  def updateClassPath(subst: Map[ClassPath, ClassPath]): Unit
 
   /** Add new entry to classpath */
   def addToClassPath(cPath: ClassPath)(using Context): Unit

Diff for: compiler/src/dotty/tools/dotc/core/Contexts.scala

@@ -36,7 +36,6 @@ import scala.annotation.internal.sharable
 import DenotTransformers.DenotTransformer
 import dotty.tools.dotc.profile.Profiler
 import dotty.tools.dotc.sbt.interfaces.{IncrementalCallback, ProgressCallback}
-import dotty.tools.dotc.classpath.ClassPathFactory
 import util.Property.Key
 import util.Store
 import plugins.*
@@ -919,11 +918,8 @@ object Contexts {
     /** Initializes the `ContextBase` with a starting context.
      *  This initializes the `platform` and the `definitions`.
      */
-    def initialize(previousOutputDir: Option[AbstractFile] = None)(using Context): Unit = {
+    def initialize()(using Context): Unit = {
       _platform = newPlatform
-      previousOutputDir.foreach(cp =>
-        _platform.nn.addToClassPath(ClassPathFactory.newClassPath(cp))
-      )
       definitions.init()
     }
 

Diff for: compiler/src/dotty/tools/dotc/core/Definitions.scala

@@ -2220,7 +2220,7 @@ class Definitions {
 
   private var isInitialized = false
 
-  def init(require: Boolean = false)(using Context): Unit = {
+  def init()(using Context): Unit = {
     this.initCtx = ctx
     if (!isInitialized) {
       // force initialization of every symbol that is synthesized or hijacked by the compiler

Diff for: compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala

@@ -7,6 +7,7 @@ import java.nio.channels.ClosedByInterruptException
 
 import scala.util.control.NonFatal
 
+import dotty.tools.dotc.classpath.{ ClassPathFactory, PackageNameUtils }
 import dotty.tools.dotc.classpath.FileUtils.{hasTastyExtension, hasBetastyExtension}
 import dotty.tools.io.{ ClassPath, ClassRepresentation, AbstractFile, NoAbstractFile }
 import dotty.tools.backend.jvm.DottyBackendInterface.symExtensions
@@ -272,7 +273,7 @@ object SymbolLoaders {
     def maybeModuleClass(classRep: ClassRepresentation): Boolean =
       classRep.name.nonEmpty && classRep.name.last == '$'
 
-    private def enterClasses(root: SymDenotation, packageName: String, flat: Boolean)(using Context) = {
+    def enterClasses(root: SymDenotation, packageName: String, flat: Boolean)(using Context) = {
       def isAbsent(classRep: ClassRepresentation) =
         !root.unforcedDecls.lookup(classRep.name.toTypeName).exists
 
@@ -316,6 +317,32 @@ object SymbolLoaders {
         }
     }
   }
+
+  def mergeNewEntries(
+    packageClass: ClassSymbol, fullPackageName: String,
+    jarClasspath: ClassPath, fullClasspath: ClassPath,
+  )(using Context): Unit =
+    if jarClasspath.classes(fullPackageName).nonEmpty then
+      // if the package contains classes in jarClasspath, the package is invalidated (or removed if there are no more classes in it)
+      val packageVal = packageClass.sourceModule.asInstanceOf[TermSymbol]
+      if packageClass.isRoot then
+        val loader = new PackageLoader(packageVal, fullClasspath)
+        loader.enterClasses(defn.EmptyPackageClass, fullPackageName, flat = false)
+        loader.enterClasses(defn.EmptyPackageClass, fullPackageName, flat = true)
+      else if packageClass.ownersIterator.contains(defn.ScalaPackageClass) then
+        () // skip
+      else if fullClasspath.hasPackage(fullPackageName) then
+        packageClass.info = new PackageLoader(packageVal, fullClasspath)
+      else
+        packageClass.owner.info.decls.openForMutations.unlink(packageVal)
+    else
+      for p <- jarClasspath.packages(fullPackageName) do
+        val subPackageName = PackageNameUtils.separatePkgAndClassNames(p.name)._2.toTermName
+        val subPackage = packageClass.info.decl(subPackageName).orElse:
+          // package does not exist in symbol table, create a new symbol
+          enterPackage(packageClass, subPackageName, (module, modcls) => new PackageLoader(module, fullClasspath))
+        mergeNewEntries(subPackage.asSymDenotation.moduleClass.asClass, p.name, jarClasspath, fullClasspath)
+  end mergeNewEntries
 }
 
 /** A lazy type that completes itself by calling parameter doComplete.

Diff for: compiler/src/dotty/tools/repl/ReplCompiler.scala

@@ -46,11 +46,7 @@ class ReplCompiler extends Compiler:
       /** Import previous runs and user defined imports */
       override protected def rootContext(using Context): Context = {
         def importContext(imp: tpd.Import)(using Context) =
-          // TODO: only when context has changed?
-          val typer = ctx.typer
-          typer.index(imp)
-          val imp2 = typer.typed(imp).asInstanceOf[tpd.Import]
-          ctx.importContext(imp2, imp2.symbol)
+          ctx.importContext(imp, imp.symbol)
 
         def importPreviousRun(id: Int)(using Context) = {
           // we first import the wrapper object id

Diff for: compiler/src/dotty/tools/repl/ReplDriver.scala

@@ -1,8 +1,10 @@
 package dotty.tools.repl
 
 import scala.language.unsafeNulls
+
 import java.io.{File => JFile, PrintStream}
 import java.nio.charset.StandardCharsets
+
 import dotty.tools.dotc.ast.Trees.*
 import dotty.tools.dotc.ast.{tpd, untpd}
 import dotty.tools.dotc.classpath.ClassPathFactory
@@ -20,6 +22,7 @@ import dotty.tools.dotc.core.NameOps.*
 import dotty.tools.dotc.core.Names.Name
 import dotty.tools.dotc.core.StdNames.*
 import dotty.tools.dotc.core.Symbols.{Symbol, defn}
+import dotty.tools.dotc.core.SymbolLoaders
 import dotty.tools.dotc.interfaces
 import dotty.tools.dotc.interactive.Completion
 import dotty.tools.dotc.printing.SyntaxHighlighting
@@ -70,6 +73,7 @@ case class State(objectIndex: Int,
                  quiet: Boolean,
                  context: Context):
   def validObjectIndexes = (1 to objectIndex).filterNot(invalidObjectIndexes.contains(_))
+  //def copy() = this
 
 /** Main REPL instance, orchestrating input, compilation and presentation */
 class ReplDriver(settings: Array[String],
@@ -94,7 +98,7 @@ class ReplDriver(settings: Array[String],
     initCtx.settings.YwithBestEffortTasty.name
   )
 
-  private def setupRootCtx(settings: Array[String], rootCtx: Context, previousOutputDir: Option[AbstractFile] = None) = {
+  private def setupRootCtx(settings: Array[String], rootCtx: Context) = {
     val incompatible = settings.intersect(incompatibleOptions)
     val filteredSettings =
       if !incompatible.isEmpty then
@@ -107,7 +111,7 @@ class ReplDriver(settings: Array[String],
       case Some((files, ictx)) => inContext(ictx) {
         shouldStart = true
         if files.nonEmpty then out.println(i"Ignoring spurious arguments: $files%, %")
-        ictx.base.initialize(previousOutputDir)
+        ictx.base.initialize()
         ictx
       }
       case None =>
@@ -540,30 +544,23 @@ class ReplDriver(settings: Array[String],
         if (existingClass.nonEmpty)
           out.println(s"The path '$path' cannot be loaded, it contains a classfile that already exists on the classpath: ${existingClass.get}")
           state
-        else
-          val prevClassPath = state.context.platform.classPath(using state.context).asClassPathString
-          val newClassPath = s"$prevClassPath${JFile.pathSeparator}$path"
+        else inContext(state.context):
+          val jarClassPath = ClassPathFactory.newClassPath(jarFile)
+          val prevOutputDir = ctx.settings.outputDir.value
 
           // add to compiler class path
-          val prevOutputDir = rootCtx.settings.outputDir.valueIn(rootCtx.settingsState)
-          val ctxToUse = initCtx.fresh
-            .setSetting(rootCtx.settings.classpath, newClassPath)
-            .setSetting(rootCtx.settings.outputDir, prevOutputDir) // reuse virtual output directory
-          rootCtx = setupRootCtx(
-            Array(),
-            ctxToUse,
-            previousOutputDir = Some(prevOutputDir)
-          )
-          val s = state.copy(context = rootCtx)
+          ctx.platform.addToClassPath(jarClassPath)
+          SymbolLoaders.mergeNewEntries(defn.RootClass, ClassPath.RootPackage, jarClassPath, ctx.platform.classPath)
 
           // new class loader with previous output dir and specified jar
-          val prevClassLoader = rendering.classLoader()(using state.context)
+          val prevClassLoader = rendering.classLoader()
           val jarClassLoader = fromURLsParallelCapable(
-            ClassPathFactory.newClassPath(jarFile)(using rootCtx).asURLs, prevClassLoader)
+            jarClassPath.asURLs, prevClassLoader)
           rendering.myClassLoader = new AbstractFileClassLoader(
-            rootCtx.settings.outputDir.valueIn(rootCtx.settingsState), jarClassLoader)
+            prevOutputDir, jarClassLoader)
+
           out.println(s"Added '$path' to classpath.")
-          s
+          state
 
     case TypeOf(expr) =>
       expr match {

Diff for: compiler/test/dotty/tools/repl/ReplTest.scala

@@ -98,10 +98,7 @@ extends ReplDriver(options, new PrintStream(out, true, StandardCharsets.UTF_8.na
         FileDiff.dump(checkFile.toPath.toString, actualOutput)
         println(s"Wrote updated script file to $checkFile")
       else
-        println("expected =========>")
-        println(expectedOutput.mkString(EOL))
-        println("actual ===========>")
-        println(actualOutput.mkString(EOL))
+        println(dotc.util.DiffUtil.mkColoredHorizontalLineDiff(actualOutput.mkString(EOL), expectedOutput.mkString(EOL)))
 
         fail(s"Error in script $name, expected output did not match actual")
     end if