rewiring-dependencies on settings in the bytecode emitter

src/dotty/tools/dotc/backend/jvm/BCodeHelpers.scala

@@ -209,26 +209,30 @@ abstract class BCodeHelpers extends BCodeTypes with BytecodeWriters {
    * must-single-thread
    */
   def initBytecodeWriter(entryPoints: List[Symbol])(implicit ctx: Context): BytecodeWriter = {
+
+    import ctx.base.settings
+    import ctx.log
+
     settings.outputDirs.getSingleOutput match {
       case Some(f) if f hasExtension "jar" =>
         // If no main class was specified, see if there's only one
         // entry point among the classes going into the jar.
         if (settings.mainClass.isDefault) {
           entryPoints map (_.fullName('.')) match {
             case Nil      =>
-              ctx.log("No Main-Class designated or discovered.")
+              log("No Main-Class designated or discovered.")
             case name :: Nil =>
-              ctx.log(s"Unique entry point: setting Main-Class to $name")
-              settings.mainClass.value = name
+              log(s"Unique entry point: setting Main-Class to $name")
+              settings.mainClass.update(name)
             case names =>
-              ctx.log(s"No Main-Class due to multiple entry points:\n  ${names.mkString("\n  ")}")
+              log(s"No Main-Class due to multiple entry points:\n  ${names.mkString("\n  ")}")
           }
         }
-        else ctx.log(s"Main-Class was specified: ${settings.mainClass.value}")
+        else log(s"Main-Class was specified: ${settings.mainClass.value}")
 
         new DirectToJarfileWriter(f.file)
 
-      case _ => factoryNonJarBytecodeWriter()
+      case _ => factoryNonJarBytecodeWriter(ctx)
     }
   }
 
@@ -295,17 +299,6 @@ abstract class BCodeHelpers extends BCodeTypes with BytecodeWriters {
 
   } // end of method addInnerClassesASM()
 
-  /**
-   * All components (e.g. BCPickles, BCInnerClassGen) of the builder classes
-   * extend this trait to have access to the context.
-   *
-   * The context is provided by the three leaf classes (PlainClassBuilder,
-   * JMirrorBuilder and JBeanInfoBuilder) as class parameter.
-   */
-  trait HasContext {
-    implicit protected val ctx: Context
-  }
-
   /*
    * Custom attribute (JVMS 4.7.1) "ScalaSig" used as marker only
    * i.e., the pickle is contained in a custom annotation, see:
@@ -395,7 +388,7 @@ abstract class BCodeHelpers extends BCodeTypes with BytecodeWriters {
 
   trait BCInnerClassGen extends HasContext {
 
-    def debugLevel = settings.debuginfo.indexOfChoice
+    def debugLevel = ctx.settings.g.indexOfChoice
 
     val emitSource = debugLevel >= 1
     val emitLines  = debugLevel >= 2
@@ -797,7 +790,7 @@ abstract class BCodeHelpers extends BCodeTypes with BytecodeWriters {
       // without it.  This is particularly bad because the availability of
       // generic information could disappear as a consequence of a seemingly
       // unrelated change.
-         settings.Ynogenericsig
+         ctx.settings.Ynogenericsig
       || sym.isArtifact
       || sym.isLiftedMethod
       || sym.isBridge
@@ -829,7 +822,7 @@ abstract class BCodeHelpers extends BCodeTypes with BytecodeWriters {
             catch { case _: Throwable => false }
           }
 
-      if (settings.Xverify) {
+      if (ctx.settings.Xverify) {
         // Run the signature parser to catch bogus signatures.
         val isValidSignature = wrap {
           // Alternative: scala.tools.reflect.SigParser (frontend to sun.reflect.generics.parser.SignatureParser)
@@ -849,7 +842,7 @@ abstract class BCodeHelpers extends BCodeTypes with BytecodeWriters {
         }
       }
 
-      if ((settings.check containsName phaseName)) {
+      if ((ctx.settings.check containsName phaseName)) {
         val normalizedTpe = enteringErasure(erasure.prepareSigMap(memberTpe))
         val bytecodeTpe = owner.thisType.memberInfo(sym)
         if (!sym.isType && !sym.isConstructor && !(erasure.erasure(sym)(normalizedTpe) =:= bytecodeTpe)) {

src/dotty/tools/dotc/backend/jvm/BCodeIdiomatic.scala

@@ -25,7 +25,7 @@ import core.Symbols.{Symbol, NoSymbol}
  */
 abstract class BCodeIdiomatic extends BCodeGlue {
 
-  val classfileVersion: Int = settings.target.value match {
+  def classfileVersion(implicit ctx: Context): Int = ctx.settings.target.value match {
     case "jvm-1.5"     => asm.Opcodes.V1_5
     case "jvm-1.6"     => asm.Opcodes.V1_6
     case "jvm-1.7"     => asm.Opcodes.V1_7

src/dotty/tools/dotc/backend/jvm/BCodeSkelBuilder.scala

@@ -171,7 +171,7 @@ abstract class BCodeSkelBuilder extends BCodeHelpers {
 
       } else {
 
-        val skipStaticForwarders = (claszSymbol.isInterface || settings.noForwarders)
+        val skipStaticForwarders = (claszSymbol.isInterface || ctx.settings.noForwarders)
         if (!skipStaticForwarders) {
           val lmoc = claszSymbol.companionModule
           // add static forwarders if there are no name conflicts; see bugs #363 and #1735
@@ -605,7 +605,7 @@ abstract class BCodeSkelBuilder extends BCodeHelpers {
             case Return(_) => ()
             case EmptyTree =>
               globalError("Concrete method has no definition: " + dd + (
-                if (settings.debug) "(found: " + methSymbol.owner.info.decls.toList.mkString(", ") + ")"
+                if (ctx.settings.debug) "(found: " + methSymbol.owner.info.decls.toList.mkString(", ") + ")"
                 else "")
               )
             case _ =>

src/dotty/tools/dotc/backend/jvm/BCodeTypes.scala

@@ -29,7 +29,7 @@ import StdNames.{nme, tpnme}
 abstract class BCodeTypes extends BCodeIdiomatic {
 
   // when compiling the Scala library, some assertions don't hold (e.g., scala.Boolean has null superClass although it's not an interface)
-  val isCompilingStdLib = !(settings.sourcepath.isDefault)
+  def isCompilingStdLib(implicit ctx: Context) = !(ctx.settings.sourcepath.isDefault)
 
   val srBoxedUnit  = brefType("scala/runtime/BoxedUnit")
 

src/dotty/tools/dotc/backend/jvm/BytecodeWriters.scala

@@ -12,6 +12,7 @@ import java.io.{ DataOutputStream, FileOutputStream, IOException, OutputStream,
 import java.util.jar.Attributes.Name
 
 import dotty.tools.io._
+import core.Contexts.Context
 
 /** Can't output a file due to the state of the file system. */
 class FileConflictException(msg: String, val file: AbstractFile) extends IOException(msg)
@@ -22,8 +23,8 @@ class FileConflictException(msg: String, val file: AbstractFile) extends IOExcep
  */
 trait BytecodeWriters {
 
-  def outputDirectory(sym: Symbol): AbstractFile =
-    settings.outputDirs outputDirFor enteringFlatten(sym.sourceFile)
+  def outputDirectory(sym: Symbol)(implicit ctx: Context): AbstractFile =
+    ctx.settings.outputDirs outputDirFor enteringFlatten(sym.sourceFile)
 
   /**
    * @param clsName cls.getName
@@ -40,26 +41,27 @@ trait BytecodeWriters {
   def getFile(sym: Symbol, clsName: String, suffix: String): AbstractFile =
     getFile(outputDirectory(sym), clsName, suffix)
 
-  def factoryNonJarBytecodeWriter(): BytecodeWriter = {
-    val emitAsmp  = settings.Ygenasmp.isSetByUser
-    val doDump    = settings.Ydumpclasses.isSetByUser
+  def factoryNonJarBytecodeWriter(implicit ctx: Context): BytecodeWriter = {
+    val emitAsmp  = ctx.settings.Ygenasmp.isSetByUser
+    val doDump    = ctx.settings.Ydumpclasses.isSetByUser
     (emitAsmp, doDump) match {
-      case (false, false) => new ClassBytecodeWriter { }
-      case (false, true ) => new ClassBytecodeWriter with DumpBytecodeWriter { }
+      case (false, false) => new ClassBytecodeWriter
+      case (false, true ) => new ClassBytecodeWriter with DumpBytecodeWriter
       case (true,  false) => new ClassBytecodeWriter with AsmpBytecodeWriter
-      case (true,  true ) => new ClassBytecodeWriter with AsmpBytecodeWriter with DumpBytecodeWriter { }
+      case (true,  true ) => new ClassBytecodeWriter with AsmpBytecodeWriter with DumpBytecodeWriter
     }
   }
 
-  trait BytecodeWriter {
+  trait BytecodeWriter extends HasContext {
     def writeClass(label: String, jclassName: String, jclassBytes: Array[Byte], outfile: AbstractFile): Unit
     def close(): Unit = ()
   }
 
-  class DirectToJarfileWriter(jfile: JFile) extends BytecodeWriter {
+  class DirectToJarfileWriter(jfile: JFile)(implicit protected val ctx: Context)
+  extends BytecodeWriter {
     val jarMainAttrs = (
-      if (settings.mainClass.isDefault) Nil
-      else List(Name.MAIN_CLASS -> settings.mainClass.value)
+      if (ctx.settings.mainClass.isDefault) Nil
+      else List(Name.MAIN_CLASS -> ctx.settings.mainClass.value)
     )
     val writer = new Jar(jfile).jarWriter(jarMainAttrs: _*)
 
@@ -88,7 +90,7 @@ trait BytecodeWriters {
   trait AsmpBytecodeWriter extends BytecodeWriter {
     import dotty.tools.asm
 
-    private val baseDir = Directory(settings.Ygenasmp.value).createDirectory()
+    private val baseDir = Directory(ctx.settings.Ygenasmp.value).createDirectory()
 
     private def emitAsmp(jclassBytes: Array[Byte], asmpFile: io.File): Unit = {
       val pw = asmpFile.printWriter()
@@ -114,7 +116,7 @@ trait BytecodeWriters {
     }
   }
 
-  trait ClassBytecodeWriter extends BytecodeWriter {
+  class ClassBytecodeWriter(implicit protected val ctx: Context) extends BytecodeWriter {
     def writeClass(label: String, jclassName: String, jclassBytes: Array[Byte], outfile: AbstractFile): Unit = {
       assert(outfile != null,
              "Precisely this override requires its invoker to hand out a non-null AbstractFile.")
@@ -127,7 +129,7 @@ trait BytecodeWriters {
   }
 
   trait DumpBytecodeWriter extends BytecodeWriter {
-    val baseDir = Directory(settings.Ydumpclasses.value).createDirectory()
+    val baseDir = Directory(ctx.settings.Ydumpclasses.value).createDirectory()
 
     abstract override def writeClass(label: String, jclassName: String, jclassBytes: Array[Byte], outfile: AbstractFile): Unit = {
       super.writeClass(label, jclassName, jclassBytes, outfile)

src/dotty/tools/dotc/backend/jvm/GenBCode.scala

@@ -297,6 +297,9 @@ object GenBCode extends BCodeSyncAndTry {
 
       // clearing maps
       clearBCodeTypes()
+
+      // free the Context instance reachable from BytecodeWriter
+      bytecodeWriter = null
     }
 
     override def run(implicit ctx: Context): Unit = unsupported("run()")

src/dotty/tools/dotc/backend/jvm/HasContext.scala

@@ -0,0 +1,24 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2012 LAMP/EPFL
+ * @author  Martin Odersky
+ */
+
+package dotty.tools.dotc
+package backend.jvm
+
+import core.Contexts.Context
+
+/**
+ * All components (e.g. BCPickles, BCInnerClassGen) of the builder classes
+ * extend this trait to have access to the context.
+ *
+ * The context is provided by the three leaf classes (PlainClassBuilder,
+ * JMirrorBuilder and JBeanInfoBuilder) as class parameter.
+ * 
+ * Same goes for BytecodeWriter
+ */
+trait HasContext {
+  implicit protected val ctx: Context
+}
+
+

src/dotty/tools/dotc/config/ScalaSettings.scala

@@ -49,10 +49,6 @@ class ScalaSettings extends Settings.SettingGroup {
   /** -X "Advanced" settings
    */
   val Xhelp = BooleanSetting("-X", "Print a synopsis of advanced options.")
-  val assemname = StringSetting("-Xassem-name", "file", "(Requires -target:msil) Name of the output assembly.", "").dependsOn(target, "msil")
-  val assemrefs = StringSetting("-Xassem-path", "path", "(Requires -target:msil) List of assemblies referenced by the program.", ".").dependsOn(target, "msil")
-  val assemextdirs = StringSetting("-Xassem-extdirs", "dirs", "(Requires -target:msil) List of directories containing assemblies.  default:lib", Defaults.scalaLibDir.path).dependsOn(target, "msil")
-  val sourcedir = StringSetting("-Xsourcedir", "directory", "(Requires -target:msil) Mirror source folder structure in output directory.", ".").dependsOn(target, "msil")
   val checkInit = BooleanSetting("-Xcheckinit", "Wrap field accessors to throw an exception on uninitialized access.")
   val noassertions = BooleanSetting("-Xdisable-assertions", "Generate no assertions or assumptions.")
 //  val elidebelow = IntSetting("-Xelide-below", "Calls to @elidable methods are omitted if method priority is lower than argument",