Omnibus tweaks

src/compiler/scala/tools/nsc/CompilationUnits.scala

@@ -153,7 +153,7 @@ trait CompilationUnits { global: Global =>
     final def comment(pos: Position, msg: String): Unit = {}
 
     /** Is this about a .java source file? */
-    lazy val isJava = source.file.name.endsWith(".java")
+    val isJava = source.file.name.endsWith(".java")
 
     override def toString() = source.toString()
   }

src/compiler/scala/tools/nsc/Global.scala

@@ -405,12 +405,18 @@ class Global(var currentSettings: Settings, reporter0: Reporter)
 
     def apply(unit: CompilationUnit): Unit
 
+    // run only the phases needed
+    private[this] val runThisPhaseForJava: Boolean = shouldRunThisPhaseForJava
+
+    protected def shouldRunThisPhaseForJava: Boolean = {
+      this.id > (if (createJavadoc) currentRun.typerPhase.id
+      else currentRun.namerPhase.id)
+    }
+
     /** Is current phase cancelled on this unit? */
     def cancelled(unit: CompilationUnit) = {
-      // run the typer only if in `createJavadoc` mode
-      val maxJavaPhase = if (createJavadoc) currentRun.typerPhase.id else currentRun.namerPhase.id
       if (Thread.interrupted()) reporter.cancelled = true
-      reporter.cancelled || unit.isJava && this.id > maxJavaPhase
+      reporter.cancelled || unit.isJava && runThisPhaseForJava
     }
 
     private def beforeUnit(unit: CompilationUnit): Unit = {

src/compiler/scala/tools/nsc/backend/Platform.scala

@@ -57,7 +57,7 @@ trait Platform {
     *   - Caching the ScalaSignature annotation contents, to avoid the cost of decompressing
     *     and parsing the classfile, akin to the OpenJDK's .sig format for stripped class files.
     *   - Starting a downstream compilation job immediately after the upstream job has completed
-    *     the pickler phase ("Build Pipelineing")
+    *     the pickler phase ("Build Pipelining")
     */
   abstract class ClassPathPlugin {
     def info(file: AbstractFile, clazz: ClassSymbol): Option[ClassfileInfo]

src/compiler/scala/tools/nsc/symtab/classfile/Pickler.scala

@@ -90,6 +90,8 @@ abstract class Pickler extends SubComponent {
           throw e
       }
     }
+
+    override protected def shouldRunThisPhaseForJava: Boolean = true //from some -Y ??
   }
 
   private class Pickle(root: Symbol) extends PickleBuffer(new Array[Byte](4096), -1, 0) {
@@ -213,7 +215,7 @@ abstract class Pickler extends SubComponent {
                 // initially, but seems not to work, as the bug shows).
                 // Adding the LOCAL_CHILD is necessary to retain exhaustivity warnings under separate
                 // compilation. See test neg/aladdin1055.
-                val parents = (if (sym.isTrait) List(definitions.ObjectTpe) else Nil) ::: List(sym.tpe)
+                val parents = if (sym.isTrait) List(definitions.ObjectTpe, sym.tpe) else List(sym.tpe)
                 globals + sym.newClassWithInfo(tpnme.LOCAL_CHILD, parents, EmptyScope, pos = sym.pos)
               }
 

test/junit/scala/tools/nsc/classpath/ClassPluginTest.scala

@@ -26,7 +26,7 @@ class ClassPluginTest extends BytecodeTesting {
   // ... and this one to read them with a ClassPathPlugin
   object symbolTable extends SymbolTableForUnitTesting {
     val fakeClasses = Map(
-      "fake.C" -> ScalaClass("fake.C", pickleOf("package fake; class C { def foo = 42 }"))
+      "fake.C" -> ScalaClass("fake.C", () => pickleOf("package fake; class C { def foo = 42 }"))
     )
     private val fakes = new VirtualDirectory("fakes", None)
     fakes.subdirectoryNamed("fake").fileNamed("C.class")