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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Martin Odersky
*/

package scala.tools.nsc

import java.io.{ File, FileOutputStream, PrintWriter, IOException, FileNotFoundException }
import java.nio.charset.{ Charset, CharsetDecoder, IllegalCharsetNameException, UnsupportedCharsetException }
import scala.compat.Platform.currentTime
import scala.collection.{ mutable, immutable }
import io.{ SourceReader, AbstractFile, Path }
import reporters.{ Reporter, ConsoleReporter }
import util.{ ClassPath, MergedClassPath, StatisticsInfo, returning, stackTraceString, stackTraceHeadString }
import scala.reflect.internal.util.{ OffsetPosition, SourceFile, NoSourceFile, BatchSourceFile, ScriptSourceFile }
import scala.reflect.internal.pickling.{ PickleBuffer, PickleFormat }
import symtab.{ Flags, SymbolTable, SymbolLoaders, SymbolTrackers }
import symtab.classfile.Pickler
import dependencies.DependencyAnalysis
import plugins.Plugins
import ast._
import ast.parser._
import typechecker._
import transform._
import backend.icode.{ ICodes, GenICode, ICodeCheckers }
import backend.{ ScalaPrimitives, Platform, JavaPlatform }
import backend.jvm.GenASM
import backend.opt.{ Inliners, InlineExceptionHandlers, ClosureElimination, DeadCodeElimination }
import backend.icode.analysis._
import scala.language.postfixOps

class Global(var currentSettings: Settings, var reporter: Reporter)
    extends SymbolTable
    with CompilationUnits
    with Plugins
    with PhaseAssembly
    with Trees
    with Printers
    with DocComments
    with Positions { self =>

  // the mirror --------------------------------------------------

  override def isCompilerUniverse = true

  class GlobalMirror extends Roots(NoSymbol) {
    val universe: self.type = self
    def rootLoader: LazyType = platform.rootLoader
    override def toString = "compiler mirror"
  }

  lazy val rootMirror: Mirror = {
    val rm = new GlobalMirror
    rm.init()
    rm.asInstanceOf[Mirror]
  }
  def RootClass: ClassSymbol = rootMirror.RootClass
  def EmptyPackageClass: ClassSymbol = rootMirror.EmptyPackageClass

  import definitions.findNamedMember
  def findMemberFromRoot(fullName: Name): Symbol = rootMirror.findMemberFromRoot(fullName)

  // alternate constructors ------------------------------------------

  override def settings = currentSettings

  def this(reporter: Reporter) =
    this(new Settings(err => reporter.error(null, err)), reporter)

  def this(settings: Settings) =
    this(settings, new ConsoleReporter(settings))

  def picklerPhase: Phase = if (currentRun.isDefined) currentRun.picklerPhase else NoPhase

  // platform specific elements

  type ThisPlatform = Platform { val global: Global.this.type }

  lazy val platform: ThisPlatform =
    new { val global: Global.this.type = Global.this } with JavaPlatform

  type PlatformClassPath = ClassPath[platform.BinaryRepr]
  type OptClassPath = Option[PlatformClassPath]

  def classPath: PlatformClassPath = platform.classPath

  // sub-components --------------------------------------------------

  /** Generate ASTs */
  type TreeGen = scala.tools.nsc.ast.TreeGen

  /** Tree generation, usually based on existing symbols. */
  override object gen extends {
    val global: Global.this.type = Global.this
  } with TreeGen {
    def mkAttributedCast(tree: Tree, pt: Type): Tree =
      typer.typed(mkCast(tree, pt))
  }

  /** Trees fresh from the oven, mostly for use by the parser. */
  object treeBuilder extends {
    val global: Global.this.type = Global.this
  } with TreeBuilder {
    def freshName(prefix: String): Name = freshTermName(prefix)
    def freshTermName(prefix: String): TermName = currentUnit.freshTermName(prefix)
    def freshTypeName(prefix: String): TypeName = currentUnit.freshTypeName(prefix)
    def o2p(offset: Int): Position = new OffsetPosition(currentUnit.source, offset)
    def r2p(start: Int, mid: Int, end: Int): Position = rangePos(currentUnit.source, start, mid, end)
  }

  /** Fold constants */
  object constfold extends {
    val global: Global.this.type = Global.this
  } with ConstantFolder

  /** ICode generator */
  object icodes extends {
    val global: Global.this.type = Global.this
  } with ICodes

  /** Scala primitives, used in genicode */
  object scalaPrimitives extends {
    val global: Global.this.type = Global.this
  } with ScalaPrimitives

  /** Computing pairs of overriding/overridden symbols */
  object overridingPairs extends {
    val global: Global.this.type = Global.this
  } with OverridingPairs

  // Optimizer components

  /** ICode analysis for optimization */
  object analysis extends {
    val global: Global.this.type = Global.this
  } with TypeFlowAnalysis

  /** Copy propagation for optimization */
  object copyPropagation extends {
    val global: Global.this.type = Global.this
  } with CopyPropagation

  // Components for collecting and generating output

  /** Some statistics (normally disabled) set with -Ystatistics */
  object statistics extends {
    val global: Global.this.type = Global.this
  } with StatisticsInfo

  /** Print tree in detailed form */
  object nodePrinters extends {
    val global: Global.this.type = Global.this
  } with NodePrinters {
    var lastPrintedPhase: Phase = NoPhase
    var lastPrintedSource: String = ""
    infolevel = InfoLevel.Verbose

    def showUnit(unit: CompilationUnit) {
      print(" // " + unit.source)
      if (unit.body == null) println(": tree is null")
      else {
        val source = util.stringFromWriter(w => newTreePrinter(w) print unit.body)

        // treePrinter show unit.body
        if (lastPrintedSource == source)
          println(": tree is unchanged since " + lastPrintedPhase)
        else {
          lastPrintedPhase = phase.prev // since we're running inside "exitingPhase"
          lastPrintedSource = source
          println("")
          println(source)
          println("")
        }
      }
    }
  }

  def withInfoLevel[T](infolevel: nodePrinters.InfoLevel.Value)(op: => T) = {
    val saved = nodePrinters.infolevel
    try {
      nodePrinters.infolevel = infolevel
      op
    } finally {
      nodePrinters.infolevel = saved
    }
  }

  /** Representing ASTs as graphs */
  object treeBrowsers extends {
    val global: Global.this.type = Global.this
  } with TreeBrowsers

  val nodeToString = nodePrinters.nodeToString
  val treeBrowser = treeBrowsers.create()

  // ------------ Hooks for interactive mode-------------------------

  /** Called every time an AST node is successfully typechecked in typerPhase.
*/
  def signalDone(context: analyzer.Context, old: Tree, result: Tree) {}

  /** Called from parser, which signals hereby that a method definition has been parsed. */
  def signalParseProgress(pos: Position) {}

  /** Register new context; called for every created context
*/
  def registerContext(c: analyzer.Context) {
    lastSeenContext = c
  }

  /** Register top level class (called on entering the class)
*/
  def registerTopLevelSym(sym: Symbol) {}

// ------------------ Reporting -------------------------------------

  // not deprecated yet, but a method called "error" imported into
  // nearly every trait really must go. For now using globalError.
  def error(msg: String) = globalError(msg)
  def inform(msg: String) = reporter.echo(msg)
  override def globalError(msg: String) = reporter.error(NoPosition, msg)
  override def warning(msg: String) =
    if (settings.fatalWarnings.value) globalError(msg)
    else reporter.warning(NoPosition, msg)

  // Getting in front of Predef's asserts to supplement with more info.
  // This has the happy side effect of masking the one argument forms
  // of assert and require (but for now I've reproduced them here,
  // because there are a million to fix.)
  @inline final def assert(assertion: Boolean, message: => Any) {
    // calling Predef.assert would send a freshly allocated closure wrapping the one received as argument.
    if (!assertion)
      throw new java.lang.AssertionError("assertion failed: "+ supplementErrorMessage("" + message))
  }
  @inline final def assert(assertion: Boolean) {
    assert(assertion, "")
  }
  @inline final def require(requirement: Boolean, message: => Any) {
    // calling Predef.require would send a freshly allocated closure wrapping the one received as argument.
    if (!requirement)
      throw new IllegalArgumentException("requirement failed: "+ supplementErrorMessage("" + message))
  }
  @inline final def require(requirement: Boolean) {
    require(requirement, "")
  }

  // Needs to call error to make sure the compile fails.
  override def abort(msg: String): Nothing = {
    error(msg)
    super.abort(msg)
  }

  @inline final def ifDebug(body: => Unit) {
    if (settings.debug.value)
      body
  }
  /** This is for WARNINGS which should reach the ears of scala developers
* whenever they occur, but are not useful for normal users. They should
* be precise, explanatory, and infrequent. Please don't use this as a
* logging mechanism. !!! is prefixed to all messages issued via this route
* to make them visually distinct.
*/
  @inline final override def devWarning(msg: => String) {
    if (settings.developer.value || settings.debug.value)
      warning("!!! " + msg)
  }

  private def elapsedMessage(msg: String, start: Long) =
    msg + " in " + (currentTime - start) + "ms"

  def informComplete(msg: String): Unit = reporter.withoutTruncating(inform(msg))
  def informProgress(msg: String) = if (settings.verbose.value) inform("[" + msg + "]")
  def informTime(msg: String, start: Long) = informProgress(elapsedMessage(msg, start))

  def logError(msg: String, t: Throwable): Unit = ()

  override def shouldLogAtThisPhase = settings.log.isSetByUser && (
    (settings.log containsPhase globalPhase) || (settings.log containsPhase phase)
  )
  // Over 200 closure objects are eliminated by inlining this.
  @inline final def log(msg: => AnyRef) {
    if (shouldLogAtThisPhase)
      inform("[log %s%s] %s".format(globalPhase, atPhaseStackMessage, msg))
  }

  @inline final override def debuglog(msg: => String) {
    if (settings.debug.value)
      log(msg)
  }

  @deprecated("Renamed to reportThrowable", "2.10.1")
  def logThrowable(t: Throwable): Unit = reportThrowable(t)
  def reportThrowable(t: Throwable): Unit = globalError(throwableAsString(t))
  override def throwableAsString(t: Throwable) = util.stackTraceString(t)

// ------------ File interface -----------------------------------------

  private val reader: SourceReader = {
    val defaultEncoding = Properties.sourceEncoding

    def loadCharset(name: String) =
      try Some(Charset.forName(name))
      catch {
        case _: IllegalCharsetNameException =>
          globalError("illegal charset name '" + name + "'")
          None
        case _: UnsupportedCharsetException =>
          globalError("unsupported charset '" + name + "'")
          None
      }

    val charset = ( if (settings.encoding.isSetByUser) Some(settings.encoding.value) else None ) flatMap loadCharset getOrElse {
      settings.encoding.value = defaultEncoding // A mandatory charset
      Charset.forName(defaultEncoding)
    }

    def loadReader(name: String): Option[SourceReader] = {
      def ccon = Class.forName(name).getConstructor(classOf[CharsetDecoder], classOf[Reporter])

      try Some(ccon.newInstance(charset.newDecoder(), reporter).asInstanceOf[SourceReader])
      catch { case ex: Throwable =>
        globalError("exception while trying to instantiate source reader '" + name + "'")
        None
      }
    }

    ( if (settings.sourceReader.isSetByUser) Some(settings.sourceReader.value) else None ) flatMap loadReader getOrElse {
      new SourceReader(charset.newDecoder(), reporter)
    }
  }

  if (!dependencyAnalysis.off)
    dependencyAnalysis.loadDependencyAnalysis()

  if (settings.verbose.value || settings.Ylogcp.value) {
    // Uses the "do not truncate" inform
    informComplete("[search path for source files: " + classPath.sourcepaths.mkString(",") + "]")
    informComplete("[search path for class files: " + classPath.asClasspathString + "]")
  }

  // The current division between scala.reflect.* and scala.tools.nsc.* is pretty
  // clunky. It is often difficult to have a setting influence something without having
  // to create it on that side. For this one my strategy is a constant def at the file
  // where I need it, and then an override in Global with the setting.
  override protected val etaExpandKeepsStar = settings.etaExpandKeepsStar.value
  // Here comes another one...
  override protected val enableTypeVarExperimentals = settings.Xexperimental.value

  def getSourceFile(f: AbstractFile): BatchSourceFile =
    if (settings.script.isSetByUser) ScriptSourceFile(f, reader read f)
    else new BatchSourceFile(f, reader read f)

  def getSourceFile(name: String): SourceFile = {
    val f = AbstractFile.getFile(name)
    if (f eq null) throw new FileNotFoundException(
      "source file '" + name + "' could not be found")
    getSourceFile(f)
  }

  lazy val loaders = new SymbolLoaders {
    val global: Global.this.type = Global.this
  }

  /** Returns the mirror that loaded given symbol */
  def mirrorThatLoaded(sym: Symbol): Mirror = rootMirror

// ------------ Phases -------------------------------------------}

  var globalPhase: Phase = NoPhase

  val MaxPhases = 64

  val phaseWithId: Array[Phase] = Array.fill(MaxPhases)(NoPhase)

  abstract class GlobalPhase(prev: Phase) extends Phase(prev) {
    phaseWithId(id) = this

    def run() {
      echoPhaseSummary(this)
      currentRun.units foreach applyPhase
    }

    def apply(unit: CompilationUnit): Unit

    private val isErased = prev.name == "erasure" || prev.erasedTypes
    override def erasedTypes: Boolean = isErased
    private val isFlat = prev.name == "flatten" || prev.flatClasses
    override def flatClasses: Boolean = isFlat
    private val isSpecialized = prev.name == "specialize" || prev.specialized
    override def specialized: Boolean = isSpecialized
    private val isRefChecked = prev.name == "refchecks" || prev.refChecked
    override def refChecked: Boolean = isRefChecked

    /** 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
      reporter.cancelled || unit.isJava && this.id > maxJavaPhase
    }

    final def applyPhase(unit: CompilationUnit) {
      if ((unit ne null) && unit.exists)
        lastSeenSourceFile = unit.source

      if (settings.debug.value && (settings.verbose.value || currentRun.size < 5))
        inform("[running phase " + name + " on " + unit + "]")

      val unit0 = currentUnit
      try {
        currentRun.currentUnit = unit
        if (!cancelled(unit)) {
          currentRun.informUnitStarting(this, unit)
          apply(unit)
        }
        currentRun.advanceUnit
      } finally {
        //assert(currentUnit == unit)
        currentRun.currentUnit = unit0
      }
    }
  }

  /** Switch to turn on detailed type logs */
  val printTypings = settings.Ytyperdebug.value
  val printInfers = settings.Yinferdebug.value

  // phaseName = "parser"
  object syntaxAnalyzer extends {
    val global: Global.this.type = Global.this
    val runsAfter = List[String]()
    val runsRightAfter = None
  } with SyntaxAnalyzer

  // !!! I think we're overdue for all these phase objects being lazy vals.
  // There's no way for a Global subclass to provide a custom typer
  // despite the existence of a "def newTyper(context: Context): Typer"
  // which is clearly designed for that, because it's defined in
  // Analyzer and Global's "object analyzer" allows no override. For now
  // I only changed analyzer.
  //
  // factory for phases: namer, packageobjects, typer
  lazy val analyzer = new {
    val global: Global.this.type = Global.this
  } with Analyzer

  // phaseName = "patmat"
  object patmat extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("typer")
    // patmat doesn't need to be right after typer, as long as we run before supperaccesors
    // (sbt does need to run right after typer, so don't conflict)
    val runsRightAfter = None
  } with PatternMatching

  // phaseName = "superaccessors"
  object superAccessors extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("patmat")
    val runsRightAfter = None
  } with SuperAccessors

  // phaseName = "extmethods"
  object extensionMethods extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("superaccessors")
    val runsRightAfter = None
  } with ExtensionMethods

  // phaseName = "pickler"
  object pickler extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("extmethods")
    val runsRightAfter = None
  } with Pickler

  // phaseName = "refchecks"
  override object refChecks extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("pickler")
    val runsRightAfter = None
  } with RefChecks

  // phaseName = "uncurry"
  override object uncurry extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("refchecks")
    val runsRightAfter = None
  } with UnCurry

  // phaseName = "tailcalls"
  object tailCalls extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("uncurry")
    val runsRightAfter = None
  } with TailCalls

  // phaseName = "explicitouter"
  object explicitOuter extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("tailcalls")
    val runsRightAfter = None
  } with ExplicitOuter

  // phaseName = "specialize"
  object specializeTypes extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("")
    val runsRightAfter = Some("tailcalls")
  } with SpecializeTypes

  // phaseName = "erasure"
  override object erasure extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("explicitouter")
    val runsRightAfter = Some("explicitouter")
  } with Erasure

  // phaseName = "posterasure"
  object postErasure extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("erasure")
    val runsRightAfter = Some("erasure")
  } with PostErasure

  // phaseName = "lazyvals"
  object lazyVals extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("erasure")
    val runsRightAfter = None
  } with LazyVals

  // phaseName = "lambdalift"
  object lambdaLift extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("lazyvals")
    val runsRightAfter = None
  } with LambdaLift

  // phaseName = "constructors"
  object constructors extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("lambdalift")
    val runsRightAfter = None
  } with Constructors

  // phaseName = "flatten"
  object flatten extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("constructors")
    val runsRightAfter = None
  } with Flatten

  // phaseName = "mixin"
  object mixer extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("flatten", "constructors")
    val runsRightAfter = None
  } with Mixin

  // phaseName = "cleanup"
  object cleanup extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("mixin")
    val runsRightAfter = None
  } with CleanUp

  // phaseName = "icode"
  object genicode extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("cleanup")
    val runsRightAfter = None
  } with GenICode

  // phaseName = "inliner"
  object inliner extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("icode")
    val runsRightAfter = None
  } with Inliners

  // phaseName = "inlinehandlers"
  object inlineExceptionHandlers extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("inliner")
    val runsRightAfter = None
  } with InlineExceptionHandlers

  // phaseName = "closelim"
  object closureElimination extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("inlinehandlers")
    val runsRightAfter = None
  } with ClosureElimination

  // phaseName = "dce"
  object deadCode extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("closelim")
    val runsRightAfter = None
  } with DeadCodeElimination

  // phaseName = "jvm", ASM-based version
  object genASM extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("dce")
    val runsRightAfter = None
  } with GenASM

  // This phase is optional: only added if settings.make option is given.
  // phaseName = "dependencyAnalysis"
  object dependencyAnalysis extends {
    val global: Global.this.type = Global.this
    val runsAfter = List("jvm")
    val runsRightAfter = None
  } with DependencyAnalysis

  // phaseName = "terminal"
  object terminal extends {
    val global: Global.this.type = Global.this
    val phaseName = "terminal"
    val runsAfter = List("jvm")
    val runsRightAfter = None
  } with SubComponent {
    private var cache: Option[GlobalPhase] = None
    def reset(): Unit = cache = None

    def newPhase(prev: Phase): GlobalPhase =
      cache getOrElse returning(new TerminalPhase(prev))(x => cache = Some(x))

    class TerminalPhase(prev: Phase) extends GlobalPhase(prev) {
      def name = "terminal"
      def apply(unit: CompilationUnit) {}
    }
  }

  /** The checkers are for validating the compiler data structures
* at phase boundaries.
*/

  /** Tree checker */
  object treeChecker extends {
    val global: Global.this.type = Global.this
  } with TreeCheckers

  /** Icode verification */
  object icodeCheckers extends {
    val global: Global.this.type = Global.this
  } with ICodeCheckers

  object icodeChecker extends icodeCheckers.ICodeChecker()

  object typer extends analyzer.Typer(
    analyzer.NoContext.make(EmptyTree, RootClass, newScope)
  )

  /** Add the internal compiler phases to the phases set.
* This implementation creates a description map at the same time.
*/
  protected def computeInternalPhases() {
    // Note: this fits -Xshow-phases into 80 column width, which it is
    // desirable to preserve.
    val phs = List(
      syntaxAnalyzer -> "parse source into ASTs, perform simple desugaring",
      analyzer.namerFactory -> "resolve names, attach symbols to named trees",
      analyzer.packageObjects -> "load package objects",
      analyzer.typerFactory -> "the meat and potatoes: type the trees",
      patmat -> "translate match expressions",
      superAccessors -> "add super accessors in traits and nested classes",
      extensionMethods -> "add extension methods for inline classes",
      pickler -> "serialize symbol tables",
      refChecks -> "reference/override checking, translate nested objects",
      uncurry -> "uncurry, translate function values to anonymous classes",
      tailCalls -> "replace tail calls by jumps",
      specializeTypes -> "@specialized-driven class and method specialization",
      explicitOuter -> "this refs to outer pointers, translate patterns",
      erasure -> "erase types, add interfaces for traits",
      postErasure -> "clean up erased inline classes",
      lazyVals -> "allocate bitmaps, translate lazy vals into lazified defs",
      lambdaLift -> "move nested functions to top level",
      constructors -> "move field definitions into constructors",
      mixer -> "mixin composition",
      cleanup -> "platform-specific cleanups, generate reflective calls",
      genicode -> "generate portable intermediate code",
      inliner -> "optimization: do inlining",
      inlineExceptionHandlers -> "optimization: inline exception handlers",
      closureElimination -> "optimization: eliminate uncalled closures",
      deadCode -> "optimization: eliminate dead code",
      terminal -> "The last phase in the compiler chain"
    )

    phs foreach (addToPhasesSet _).tupled
  }
  // This is slightly inelegant but it avoids adding a new member to SubComponent,
  // and attractive -Xshow-phases output is unlikely if the descs span 20 files anyway.
  private val otherPhaseDescriptions = Map(
    "flatten" -> "eliminate inner classes",
    "jvm" -> "generate JVM bytecode"
  ) withDefaultValue ""

  protected def computePlatformPhases() = platform.platformPhases foreach { sub =>
    addToPhasesSet(sub, otherPhaseDescriptions(sub.phaseName))
  }

  // sequences the phase assembly
  protected def computePhaseDescriptors: List[SubComponent] = {
    computeInternalPhases() // Global.scala
    computePlatformPhases() // backend/Platform.scala
    computePluginPhases() // plugins/Plugins.scala
    buildCompilerFromPhasesSet() // PhaseAssembly.scala
  }

  /* The phase descriptor list */
  lazy val phaseDescriptors: List[SubComponent] = computePhaseDescriptors

  /* The set of phase objects that is the basis for the compiler phase chain */
  protected lazy val phasesSet = new mutable.HashSet[SubComponent]
  protected lazy val phasesDescMap = new mutable.HashMap[SubComponent, String] withDefaultValue ""

  protected def addToPhasesSet(sub: SubComponent, descr: String) {
    phasesSet += sub
    phasesDescMap(sub) = descr
  }

  /** The names of the phases. */
  lazy val phaseNames = {
    new Run // force some initialization
    phaseDescriptors map (_.phaseName)
  }

  /** A description of the phases that will run */
  def phaseDescriptions: String = {
    val Limit = 16 // phase names should not be absurdly long
    val MaxCol = 80 // because some of us edit on green screens
    val maxName = (0 /: phaseNames)(_ max _.length)
    val width = maxName min Limit
    val maxDesc = MaxCol - (width + 6) // descriptions not novels
    val fmt = if (settings.verbose.value) s"%${maxName}s %2s %s%n"
                  else s"%${width}.${width}s %2s %.${maxDesc}s%n"

    val line1 = fmt.format("phase name", "id", "description")
    val line2 = fmt.format("----------", "--", "-----------")

    // built-in string precision merely truncates
    import java.util.{ Formattable, FormattableFlags, Formatter }
    def fmtable(s: String) = new Formattable {
      override def formatTo(formatter: Formatter, flags: Int, width: Int, precision: Int) {
        val p = elliptically(s, precision)
        val w = if (width > 0 && p.length < width) {
          import FormattableFlags.LEFT_JUSTIFY
          val leftly = (flags & LEFT_JUSTIFY) == LEFT_JUSTIFY
          val sb = new StringBuilder
          def pad() = 1 to width - p.length foreach (_ => sb.append(' '))
          if (!leftly) pad()
          sb.append(p)
          if (leftly) pad()
          sb.toString
        } else p
        formatter.out.append(w)
      }
    }
    def elliptically(s: String, max: Int) =
      if (max < 0 || s.length <= max) s
      else if (max < 4) s.take(max)
      else s.take(max - 3) + "..."
    val descs = phaseDescriptors.zipWithIndex map {
      case (ph, idx) => fmt.format(fmtable(ph.phaseName), idx + 1, fmtable(phasesDescMap(ph)))
    }
    line1 :: line2 :: descs mkString
  }
  /** Summary of the per-phase values of nextFlags and newFlags, shown
* with -Xshow-phases if -Ydebug also given.
*/
  def phaseFlagDescriptions: String = {
    val width = phaseNames map (_.length) max
    val fmt = "%" + width + "s %2s %s\n"

    val line1 = fmt.format("phase name", "id", "new flags")
    val line2 = fmt.format("----------", "--", "---------")
    val descs = phaseDescriptors.zipWithIndex map {
      case (ph, idx) =>
        def fstr1 = if (ph.phaseNewFlags == 0L) "" else "[START] " + Flags.flagsToString(ph.phaseNewFlags)
        def fstr2 = if (ph.phaseNextFlags == 0L) "" else "[END] " + Flags.flagsToString(ph.phaseNextFlags)
        val fstr = (
          if (ph.ownPhase.id == 1) Flags.flagsToString(Flags.InitialFlags)
          else if (ph.phaseNewFlags != 0L && ph.phaseNextFlags != 0L) fstr1 + " " + fstr2
          else fstr1 + fstr2
        )
        fmt.format(ph.phaseName, idx + 1, fstr)
    }
    line1 :: line2 :: descs mkString
  }

  /** Returns List of (phase, value) pairs, including only those
* where the value compares unequal to the previous phase's value.
*/
  def afterEachPhase[T](op: => T): List[(Phase, T)] = { // used in tests
    phaseDescriptors.map(_.ownPhase).filterNot(_ eq NoPhase).foldLeft(List[(Phase, T)]()) { (res, ph) =>
      val value = exitingPhase(ph)(op)
      if (res.nonEmpty && res.head._2 == value) res
      else ((ph, value)) :: res
    } reverse
  }

  private def numberedPhase(ph: Phase) = "%2d/%s".format(ph.id, ph.name)

  // ------------ Invalidations ---------------------------------

  /** Is given package class a system package class that cannot be invalidated?
*/
  private def isSystemPackageClass(pkg: Symbol) =
    pkg == RootClass ||
    pkg == definitions.ScalaPackageClass || {
      val pkgname = pkg.fullName
      (pkgname startsWith "scala.") && !(pkgname startsWith "scala.tools")
    }

  /** Invalidates packages that contain classes defined in a classpath entry, and
* rescans that entry.
* @param path A fully qualified name that refers to a directory or jar file that's
* an entry on the classpath.
* First, causes the classpath entry referred to by `path` to be rescanned, so that
* any new files or deleted files or changes in subpackages are picked up.
* Second, invalidates any packages for which one of the following considitions is met:

* - the classpath entry contained during the last compilation run classfiles
* that represent a member in the package
* - the classpath entry now contains classfiles
* that represent a member in the package
* - the set of subpackages has changed.
*
* The invalidated packages are reset in their entirety; all member classes and member packages
* are re-accessed using the new classpath.
* Not invalidated are system packages that the compiler needs to access as parts
* of standard definitions. The criterion what is a system package is currently:
* any package rooted in "scala", with the exception of packages rooted in "scala.tools".
* This can be refined later.
* @return A pair consisting of
* - a list of invalidated packages
* - a list of of packages that should have been invalidated but were not because
* they are system packages.
*/
  def invalidateClassPathEntries(paths: String*): (List[ClassSymbol], List[ClassSymbol]) = {
    val invalidated, failed = new mutable.ListBuffer[ClassSymbol]
    classPath match {
      case cp: MergedClassPath[_] =>
        def assoc(path: String): List[(PlatformClassPath, PlatformClassPath)] = {
          val dir = AbstractFile getDirectory path
          val canonical = dir.canonicalPath
          def matchesCanonical(e: ClassPath[_]) = e.origin match {
            case Some(opath) =>
              (AbstractFile getDirectory opath).canonicalPath == canonical
            case None =>
              false
          }
          cp.entries find matchesCanonical match {
            case Some(oldEntry) =>
              List(oldEntry -> cp.context.newClassPath(dir))
            case None =>
              println(s"canonical = $canonical, origins = ${cp.entries map (_.origin)}")
              error(s"cannot invalidate: no entry named $path in classpath $classPath")
              List()
          }
        }
        val subst = Map(paths flatMap assoc: _*)
        if (subst.nonEmpty) {
          platform updateClassPath subst
          informProgress(s"classpath updated on entries [${subst.keys mkString ","}]")
          def mkClassPath(elems: Iterable[PlatformClassPath]): PlatformClassPath =
            if (elems.size == 1) elems.head
            else new MergedClassPath(elems, classPath.context)
          val oldEntries = mkClassPath(subst.keys)
          val newEntries = mkClassPath(subst.values)
          reSync(RootClass, Some(classPath), Some(oldEntries), Some(newEntries), invalidated, failed)
        }
    }
    def show(msg: String, syms: scala.collection.Traversable[Symbol]) =
      if (syms.nonEmpty)
        informProgress(s"$msg: ${syms map (_.fullName) mkString ","}")
    show("invalidated packages", invalidated)
    show("could not invalidate system packages", failed)
    (invalidated.toList, failed.toList)
  }

  /** Re-syncs symbol table with classpath
* @param root The root symbol to be resynced (a package class)
* @param allEntries Optionally, the corresponding package in the complete current classPath
* @param oldEntries Optionally, the corresponding package in the old classPath entries
* @param newEntries Optionally, the corresponding package in the new classPath entries
* @param invalidated A listbuffer collecting the invalidated package classes
* @param failed A listbuffer collecting system package classes which could not be invalidated
* The resyncing strategy is determined by the absence or presence of classes and packages.
* If either oldEntries or newEntries contains classes, root is invalidated, provided a corresponding package
* exists in allEntries, or otherwise is removed.
* Otherwise, the action is determined by the following matrix, with columns:
*
* old new all sym action
* + + + + recurse into all child packages of old ++ new
* + - + + invalidate root
* + - - + remove root from its scope
* - + + + invalidate root
* - + + - create and enter root
* - - * * no action
*
* Here, old, new, all mean classpaths and sym means symboltable. + is presence of an
* entry in its column, - is absence, * is don't care.
*
* Note that new <= all and old <= sym, so the matrix above covers all possibilities.
*/
  private def reSync(root: ClassSymbol,
             allEntries: OptClassPath, oldEntries: OptClassPath, newEntries: OptClassPath,
             invalidated: mutable.ListBuffer[ClassSymbol], failed: mutable.ListBuffer[ClassSymbol]) {
    ifDebug(informProgress(s"syncing $root, $oldEntries -> $newEntries"))

    val getName: ClassPath[platform.BinaryRepr] => String = (_.name)
    def hasClasses(cp: OptClassPath) = cp.isDefined && cp.get.classes.nonEmpty
    def invalidateOrRemove(root: ClassSymbol) = {
      allEntries match {
        case Some(cp) => root setInfo new loaders.PackageLoader(cp)
        case None => root.owner.info.decls unlink root.sourceModule
      }
      invalidated += root
    }
    def packageNames(cp: PlatformClassPath): Set[String] = cp.packages.toSet map getName
    def subPackage(cp: PlatformClassPath, name: String): OptClassPath =
      cp.packages find (cp1 => getName(cp1) == name)

    val classesFound = hasClasses(oldEntries) || hasClasses(newEntries)
    if (classesFound && !isSystemPackageClass(root)) {
      invalidateOrRemove(root)
    } else {
      if (classesFound) {
        if (root.isRoot) invalidateOrRemove(EmptyPackageClass)
        else failed += root
      }
      (oldEntries, newEntries) match {
        case (Some(oldcp) , Some(newcp)) =>
          for (pstr <- packageNames(oldcp) ++ packageNames(newcp)) {
            val pname = newTermName(pstr)
            val pkg = (root.info decl pname) orElse {
              // package was created by external agent, create symbol to track it
              assert(!subPackage(oldcp, pstr).isDefined)
              loaders.enterPackage(root, pstr, new loaders.PackageLoader(allEntries.get))
            }
            reSync(
                pkg.moduleClass.asInstanceOf[ClassSymbol],
                subPackage(allEntries.get, pstr), subPackage(oldcp, pstr), subPackage(newcp, pstr),
                invalidated, failed)
          }
        case (Some(oldcp), None) =>
          invalidateOrRemove(root)
        case (None, Some(newcp)) =>
          invalidateOrRemove(root)
        case (None, None) =>
      }
    }
  }

  /** Invalidate contents of setting -Yinvalidate */
  def doInvalidation() = settings.Yinvalidate.value match {
    case "" =>
    case entry => invalidateClassPathEntries(entry)
  }

  // ----------- Runs ---------------------------------------

  private var curRun: Run = null
  private var curRunId = 0

  /** A hook that lets subclasses of `Global` define whether a package or class should be kept loaded for the
* next compiler run. If the parameter `sym` is a class or object, and `clearOnNextRun(sym)` returns `true`,
* then the symbol is unloaded and reset to its state before the last compiler run. If the parameter `sym` is
* a package, and clearOnNextRun(sym)` returns `true`, the package is recursively searched for
* classes to drop.
*
* Example: Let's say I want a compiler that drops all classes corresponding to the current project
* between runs. Then `keepForNextRun` of a toplevel class or object should return `true` if the
* class or object does not form part of the current project, `false` otherwise. For a package,
* clearOnNextRun should return `true` if no class in that package forms part of the current project,
* `false` otherwise.
*
* @param sym A class symbol, object symbol, package, or package class.
*/
  @deprecated("use invalidateClassPathEntries instead", "2.10.0")
  def clearOnNextRun(sym: Symbol) = false
    /* To try out clearOnNext run on the scala.tools.nsc project itself
* replace `false` above with the following code

settings.Xexperimental.value && { sym.isRoot || {
sym.fullName match {
case "scala" | "scala.tools" | "scala.tools.nsc" => true
case _ => sym.owner.fullName.startsWith("scala.tools.nsc")
}
}}

* Then, fsc -Xexperimental clears the nsc project between successive runs of `fsc`.
*/

  /** Remove the current run when not needed anymore. Used by the build
* manager to save on the memory foot print. The current run holds on
* to all compilation units, which in turn hold on to trees.
*/
  private [nsc] def dropRun() {
    curRun = null
  }

  object typeDeconstruct extends {
    val global: Global.this.type = Global.this
  } with interpreter.StructuredTypeStrings

  /** There are common error conditions where when the exception hits
* here, currentRun.currentUnit is null. This robs us of the knowledge
* of what file was being compiled when it broke. Since I really
* really want to know, this hack.
*/
  protected var lastSeenSourceFile: SourceFile = NoSourceFile

  /** Let's share a lot more about why we crash all over the place.
* People will be very grateful.
*/
  protected var lastSeenContext: analyzer.Context = null

  /** The currently active run
*/
  def currentRun: Run = curRun
  def currentUnit: CompilationUnit = if (currentRun eq null) NoCompilationUnit else currentRun.currentUnit
  def currentSource: SourceFile = if (currentUnit.exists) currentUnit.source else lastSeenSourceFile

  def isGlobalInitialized = (
       definitions.isDefinitionsInitialized
    && rootMirror.isMirrorInitialized
  )
  override def isPastTyper = (
       (curRun ne null)
    && isGlobalInitialized // defense against init order issues
    && (globalPhase.id > currentRun.typerPhase.id)
  )

  // TODO - trim these to the absolute minimum.
  @inline final def exitingErasure[T](op: => T): T = exitingPhase(currentRun.erasurePhase)(op)
  @inline final def exitingPostErasure[T](op: => T): T = exitingPhase(currentRun.posterasurePhase)(op)
  @inline final def exitingExplicitOuter[T](op: => T): T = exitingPhase(currentRun.explicitouterPhase)(op)
  @inline final def exitingFlatten[T](op: => T): T = exitingPhase(currentRun.flattenPhase)(op)
  @inline final def exitingMixin[T](op: => T): T = exitingPhase(currentRun.mixinPhase)(op)
  @inline final def exitingPickler[T](op: => T): T = exitingPhase(currentRun.picklerPhase)(op)
  @inline final def exitingRefchecks[T](op: => T): T = exitingPhase(currentRun.refchecksPhase)(op)
  @inline final def exitingSpecialize[T](op: => T): T = exitingPhase(currentRun.specializePhase)(op)
  @inline final def exitingTyper[T](op: => T): T = exitingPhase(currentRun.typerPhase)(op)
  @inline final def exitingUncurry[T](op: => T): T = exitingPhase(currentRun.uncurryPhase)(op)
  @inline final def enteringErasure[T](op: => T): T = enteringPhase(currentRun.erasurePhase)(op)
  @inline final def enteringExplicitOuter[T](op: => T): T = enteringPhase(currentRun.explicitouterPhase)(op)
  @inline final def enteringFlatten[T](op: => T): T = enteringPhase(currentRun.flattenPhase)(op)
  @inline final def enteringIcode[T](op: => T): T = enteringPhase(currentRun.icodePhase)(op)
  @inline final def enteringMixin[T](op: => T): T = enteringPhase(currentRun.mixinPhase)(op)
  @inline final def enteringPickler[T](op: => T): T = enteringPhase(currentRun.picklerPhase)(op)
  @inline final def enteringRefchecks[T](op: => T): T = enteringPhase(currentRun.refchecksPhase)(op)
  @inline final def enteringTyper[T](op: => T): T = enteringPhase(currentRun.typerPhase)(op)
  @inline final def enteringUncurry[T](op: => T): T = enteringPhase(currentRun.uncurryPhase)(op)

  // Owners up to and including the first package class.
  private def ownerChainString(sym: Symbol): String = (
    if (sym == null) ""
    else sym.ownerChain.span(!_.isPackageClass) match {
      case (xs, pkg :: _) => (xs :+ pkg) mkString " -> "
      case _ => sym.ownerChain mkString " -> " // unlikely
    }
  )
  private def formatExplain(pairs: (String, Any)*): String = (
    pairs.toList collect { case (k, v) if v != null => "%20s: %s".format(k, v) } mkString "\n"
  )

  /** Don't want to introduce new errors trying to report errors,
* so swallow exceptions.
*/
  override def supplementErrorMessage(errorMessage: String): String =
    if (currentRun.supplementedError) errorMessage
    else try {
      val tree = analyzer.lastTreeToTyper
      val sym = tree.symbol
      val tpe = tree.tpe
      val enclosing = lastSeenContext.enclClassOrMethod.tree

      val info1 = formatExplain(
        "while compiling" -> currentSource.path,
        "during phase" -> ( if (globalPhase eq phase) phase else "global=%s, enteringPhase=%s".format(globalPhase, phase) ),
        "library version" -> scala.util.Properties.versionString,
        "compiler version" -> Properties.versionString,
        "reconstructed args" -> settings.recreateArgs.mkString(" ")
      )
      val info2 = formatExplain(
        "last tree to typer" -> tree.summaryString,
        "symbol" -> Option(sym).fold("null")(_.debugLocationString),
        "symbol definition" -> Option(sym).fold("null")(_.defString),
        "tpe" -> tpe,
        "symbol owners" -> ownerChainString(sym),
        "context owners" -> ownerChainString(lastSeenContext.owner)
      )
      val info3: List[String] = (
           ( List("== Enclosing template or block ==", nodePrinters.nodeToString(enclosing).trim) )
        ++ ( if (tpe eq null) Nil else List("== Expanded type of tree ==", typeDeconstruct.show(tpe)) )
        ++ ( if (!settings.debug.value) Nil else List("== Current unit body ==", nodePrinters.nodeToString(currentUnit.body)) )
        ++ ( List(errorMessage) )
      )

      currentRun.supplementedError = true

      ("\n" + info1) :: info2 :: info3 mkString "\n\n"
    }
    catch { case x: Exception => errorMessage }

  /** The id of the currently active run
*/
  override def currentRunId = curRunId

  def echoPhaseSummary(ph: Phase) = {
    /** Only output a summary message under debug if we aren't echoing each file. */
    if (settings.debug.value && !(settings.verbose.value || currentRun.size < 5))
      inform("[running phase " + ph.name + " on " + currentRun.size + " compilation units]")
  }

  /** Collects for certain classes of warnings during this run. */
  class ConditionalWarning(what: String, option: Settings#BooleanSetting) {
    val warnings = new mutable.ListBuffer[(Position, String)]
    def warn(pos: Position, msg: String) =
      if (option.value) reporter.warning(pos, msg)
      else warnings += ((pos, msg))
    def summarize() =
      if (option.isDefault && warnings.nonEmpty)
        reporter.warning(NoPosition, "there were %d %s warnings; re-run with %s for details".format(warnings.size, what, option.name))
  }

  def newUnitParser(code: String) = new syntaxAnalyzer.UnitParser(newCompilationUnit(code))
  def newCompilationUnit(code: String) = new CompilationUnit(newSourceFile(code))
  def newSourceFile(code: String) = new BatchSourceFile("<console>", code)

  /** A Run is a single execution of the compiler on a sets of units
*/
  class Run extends RunContextApi {
    /** Have been running into too many init order issues with Run
* during erroneous conditions. Moved all these vals up to the
* top of the file so at least they're not trivially null.
*/
    var isDefined = false
    /** The currently compiled unit; set from GlobalPhase */
    var currentUnit: CompilationUnit = NoCompilationUnit

    // This change broke sbt; I gave it the thrilling name of uncheckedWarnings0 so
    // as to recover uncheckedWarnings for its ever-fragile compiler interface.
    val deprecationWarnings0 = new ConditionalWarning("deprecation", settings.deprecation)
    val uncheckedWarnings0 = new ConditionalWarning("unchecked", settings.unchecked)
    val featureWarnings = new ConditionalWarning("feature", settings.feature)
    val inlinerWarnings = new ConditionalWarning("inliner", settings.YinlinerWarnings)
    val allConditionalWarnings = List(deprecationWarnings0, uncheckedWarnings0, featureWarnings, inlinerWarnings)

    def uncheckedWarnings: List[(Position, String)] = uncheckedWarnings0.warnings.toList // used in sbt
    def deprecationWarnings: List[(Position, String)] = deprecationWarnings0.warnings.toList // used in sbt

    var reportedFeature = Set[Symbol]()

    /** Has any macro expansion used a fallback during this run? */
    var seenMacroExpansionsFallingBack = false

    /** Have we already supplemented the error message of a compiler crash? */
    private[nsc] final var supplementedError = false

    private val unitbuf = new mutable.ListBuffer[CompilationUnit]
    val compiledFiles = new mutable.HashSet[String]

    /** A map from compiled top-level symbols to their source files */
    val symSource = new mutable.HashMap[Symbol, AbstractFile]

    /** A map from compiled top-level symbols to their picklers */
    val symData = new mutable.HashMap[Symbol, PickleBuffer]

    private var phasec: Int = 0 // phases completed
    private var unitc: Int = 0 // units completed this phase
    private var _unitbufSize = 0

    def size = _unitbufSize
    override def toString = "scalac Run for:\n " + compiledFiles.toList.sorted.mkString("\n ")

    // Calculate where to stop based on settings -Ystop-before or -Ystop-after.
    // Slightly complicated logic due to wanting -Ystop-before:parser to fail rather
    // than mysteriously running to completion.
    private lazy val stopPhaseSetting = {
      val result = phaseDescriptors sliding 2 collectFirst {
        case xs if xs exists (settings.stopBefore contains _.phaseName) => if (settings.stopBefore contains xs.head.phaseName) xs.head else xs.last
        case xs if settings.stopAfter contains xs.head.phaseName => xs.last
      }
      if (result exists (_.phaseName == "parser"))
        globalError("Cannot stop before parser phase.")

      result
    }
    // The phase to stop BEFORE running.
    protected def stopPhase(name: String) = stopPhaseSetting exists (_.phaseName == name)
    protected def skipPhase(name: String) = settings.skip contains name

    /** As definitions.init requires phase != NoPhase, and calling phaseDescriptors.head
* will force init, there is some jockeying herein regarding init order: instead of
* taking the head descriptor we create a parser phase directly.
*/
    private val firstPhase = {
      /** Initialization. */
      curRunId += 1
      curRun = this

      /** Set phase to a newly created syntaxAnalyzer and call definitions.init. */
      val parserPhase: Phase = syntaxAnalyzer.newPhase(NoPhase)
      phase = parserPhase
      definitions.init()

      // Flush the cache in the terminal phase: the chain could have been built
      // before without being used. (This happens in the interpreter.)
      terminal.reset

      // Each subcomponent supplies a phase, which are chained together.
      // If -Ystop:phase is given, neither that phase nor any beyond it is added.
      // If -Yskip:phase is given, that phase will be skipped.
      val phaseLinks = {
        val phs = (
          phaseDescriptors.tail
            takeWhile (pd => !stopPhase(pd.phaseName))
            filterNot (pd => skipPhase(pd.phaseName))
        )
        // Ensure there is a terminal phase at the end, since -Ystop may have limited the phases.
        if (phs.isEmpty || (phs.last ne terminal)) phs :+ terminal
        else phs
      }
      // Link them together.
      phaseLinks.foldLeft(parserPhase)((chain, ph) => ph newPhase chain)
      parserPhase
    }

    /** Reset all classes contained in current project, as determined by
* the clearOnNextRun hook
*/
    @deprecated("use invalidateClassPathEntries instead", "2.10.0")
    def resetProjectClasses(root: Symbol): Unit = try {
      def unlink(sym: Symbol) =
        if (sym != NoSymbol) root.info.decls.unlink(sym)
      if (settings.verbose.value) inform("[reset] recursing in "+root)
      val toReload = mutable.Set[String]()
      for (sym <- root.info.decls) {
        if (sym.isInitialized && clearOnNextRun(sym))
          if (sym.isPackage) {
            resetProjectClasses(sym.moduleClass)
            openPackageModule(sym.moduleClass)
          } else {
            unlink(sym)
            unlink(root.info.decls.lookup(
              if (sym.isTerm) sym.name.toTypeName else sym.name.toTermName))
            toReload += sym.fullName
              // note: toReload could be set twice with the same name
              // but reinit must happen only once per name. That's why
              // the following classPath.findClass { ... } code cannot be moved here.
          }
      }
      for (fullname <- toReload)
        classPath.findClass(fullname) match {
          case Some(classRep) =>
            if (settings.verbose.value) inform("[reset] reinit "+fullname)
            loaders.initializeFromClassPath(root, classRep)
          case _ =>
        }
    } catch {
      case ex: Throwable =>
        // this handler should not be nessasary, but it seems that `fsc`
        // eats exceptions if they appear here. Need to find out the cause for
        // this and fix it.
        inform("[reset] exception happened: "+ex);
        ex.printStackTrace();
        throw ex
    }

    // --------------- Miscellania -------------------------------

    /** Progress tracking. Measured in "progress units" which are 1 per
* compilation unit per phase completed.
*
* @param current number of "progress units" completed
* @param total total number of "progress units" in run
*/
    def progress(current: Int, total: Int) {}

    /**
* For subclasses to override. Called when `phase` is about to be run on `unit`.
* Variables are passed explicitly to indicate that `globalPhase` and `currentUnit` have been set.
*/
    def informUnitStarting(phase: Phase, unit: CompilationUnit) { }

    /** take note that phase is completed
* (for progress reporting)
*/
    def advancePhase() {
      unitc = 0
      phasec += 1
      refreshProgress
    }
    /** take note that a phase on a unit is completed
* (for progress reporting)
*/
    def advanceUnit() {
      unitc += 1
      refreshProgress
    }

    def cancel() { reporter.cancelled = true }

    private def currentProgress = (phasec * size) + unitc
    private def totalProgress = (phaseDescriptors.size - 1) * size // -1: drops terminal phase
    private def refreshProgress() = if (size > 0) progress(currentProgress, totalProgress)

    // ----- finding phases --------------------------------------------

    def phaseNamed(name: String): Phase =
      findOrElse(firstPhase.iterator)(_.name == name)(NoPhase)

    /** All phases as of 3/2012 here for handiness; the ones in
* active use uncommented.
*/
    val parserPhase = phaseNamed("parser")
    val namerPhase = phaseNamed("namer")
    // val packageobjectsPhase = phaseNamed("packageobjects")
    val typerPhase = phaseNamed("typer")
    // val inlineclassesPhase = phaseNamed("inlineclasses")
    // val superaccessorsPhase = phaseNamed("superaccessors")
    val picklerPhase = phaseNamed("pickler")
    val refchecksPhase = phaseNamed("refchecks")
    // val selectiveanfPhase = phaseNamed("selectiveanf")
    // val selectivecpsPhase = phaseNamed("selectivecps")
    val uncurryPhase = phaseNamed("uncurry")
    // val tailcallsPhase = phaseNamed("tailcalls")
    val specializePhase = phaseNamed("specialize")
    val explicitouterPhase = phaseNamed("explicitouter")
    val erasurePhase = phaseNamed("erasure")
    val posterasurePhase = phaseNamed("posterasure")
    // val lazyvalsPhase = phaseNamed("lazyvals")
    // val lambdaliftPhase = phaseNamed("lambdalift")
    // val constructorsPhase = phaseNamed("constructors")
    val flattenPhase = phaseNamed("flatten")
    val mixinPhase = phaseNamed("mixin")
    val cleanupPhase = phaseNamed("cleanup")
    val icodePhase = phaseNamed("icode")
    val inlinerPhase = phaseNamed("inliner")
    val inlineExceptionHandlersPhase = phaseNamed("inlinehandlers")
    val closelimPhase = phaseNamed("closelim")
    val dcePhase = phaseNamed("dce")
    // val jvmPhase = phaseNamed("jvm")

    def runIsAt(ph: Phase) = globalPhase.id == ph.id
    def runIsAtOptimiz = {
      runIsAt(inlinerPhase) || // listing phases in full for robustness when -Ystop-after has been given.
      runIsAt(inlineExceptionHandlersPhase) ||
      runIsAt(closelimPhase) ||
      runIsAt(dcePhase)
    }

    isDefined = true

    // ----------- Units and top-level classes and objects --------


    /** add unit to be compiled in this run */
    private def addUnit(unit: CompilationUnit) {
      unitbuf += unit
      _unitbufSize += 1 // counting as they're added so size is cheap
      compiledFiles += unit.source.file.path
    }
    private def checkDeprecatedSettings(unit: CompilationUnit) {
      // issue warnings for any usage of deprecated settings
      settings.userSetSettings filter (_.isDeprecated) foreach { s =>
        unit.deprecationWarning(NoPosition, s.name + " is deprecated: " + s.deprecationMessage.get)
      }
      if (settings.target.value.contains("jvm-1.5"))
        unit.deprecationWarning(NoPosition, settings.target.name + ":" + settings.target.value + " is deprecated: use target for Java 1.6 or above.")
    }

    /* An iterator returning all the units being compiled in this run */
    /* !!! Note: changing this to unitbuf.toList.iterator breaks a bunch
of tests in tests/res. This is bad, it means the resident compiler
relies on an iterator of a mutable data structure reflecting changes
made to the underlying structure (in whatever accidental way it is
currently depending upon.)
*/
    def units: Iterator[CompilationUnit] = unitbuf.iterator

    def registerPickle(sym: Symbol): Unit = ()

    /** does this run compile given class, module, or case factory? */
    def compiles(sym: Symbol): Boolean =
      if (sym == NoSymbol) false
      else if (symSource.isDefinedAt(sym)) true
      else if (!sym.owner.isPackageClass) compiles(sym.enclosingTopLevelClass)
      else if (sym.isModuleClass) compiles(sym.sourceModule)
      else false

    /** Is this run allowed to redefine the given symbol? Usually this is true
* if the run does not already compile `sym`, but for interactive mode
* we have a more liberal interpretation.
*/
    def canRedefine(sym: Symbol) = !compiles(sym)

    // --------------- Compilation methods ----------------------------

    protected def runCheckers() {
      val toCheck = globalPhase.prev
      val canCheck = toCheck.checkable
      val fmt = if (canCheck) "[Now checking: %s]" else "[Not checkable: %s]"

      inform(fmt format toCheck.name)

      if (canCheck) {
        phase = globalPhase
        if (globalPhase.id >= icodePhase.id) icodeChecker.checkICodes
        else treeChecker.checkTrees
      }
    }

    private def showMembers() = {
      // Allows for syntax like scalac -Xshow-class Random@erasure,typer
      def splitClassAndPhase(str: String, term: Boolean): Name = {
        def mkName(s: String) = if (term) newTermName(s) else newTypeName(s)
        (str indexOf '@') match {
          case -1 => mkName(str)
          case idx =>
            val phasePart = str drop (idx + 1)
            settings.Yshow.tryToSetColon(phasePart split ',' toList)
            mkName(str take idx)
        }
      }
      if (settings.Xshowcls.isSetByUser)
        showDef(splitClassAndPhase(settings.Xshowcls.value, false), false, globalPhase)

      if (settings.Xshowobj.isSetByUser)
        showDef(splitClassAndPhase(settings.Xshowobj.value, true), false, globalPhase)
    }

    // Similarly, this will only be created under -Yshow-syms.
    object trackerFactory extends SymbolTrackers {
      val global: Global.this.type = Global.this
      lazy val trackers = currentRun.units.toList map (x => SymbolTracker(x))
      def snapshot() = {
        inform("\n[[symbol layout at end of " + phase + "]]")
        exitingPhase(phase) {
          trackers foreach { t =>
            t.snapshot()
            inform(t.show("Heading from " + phase.prev.name + " to " + phase.name))
          }
        }
      }
    }

    def reportCompileErrors() {
      if (!reporter.hasErrors && reporter.hasWarnings && settings.fatalWarnings.value)
        globalError("No warnings can be incurred under -Xfatal-warnings.")

      if (reporter.hasErrors) {
        for ((sym, file) <- symSource.iterator) {
          sym.reset(new loaders.SourcefileLoader(file))
          if (sym.isTerm)
            sym.moduleClass reset loaders.moduleClassLoader
        }
      }
      else {
        allConditionalWarnings foreach (_.summarize)

        if (seenMacroExpansionsFallingBack)
          warning("some macros could not be expanded and code fell back to overridden methods;"+
                  "\nrecompiling with generated classfiles on the classpath might help.")
        // todo: migrationWarnings
      }
    }

    /** Compile list of source files */
    def compileSources(_sources: List[SourceFile]) {
      val sources = dependencyAnalysis calculateFiles _sources.distinct
      // there is a problem already, e.g. a plugin was passed a bad option
      if (reporter.hasErrors)
        return

      // nothing to compile, but we should still report use of deprecated options
      if (sources.isEmpty) {
        checkDeprecatedSettings(newCompilationUnit(""))
        reportCompileErrors()
        return
      }

      compileUnits(sources map (new CompilationUnit(_)), firstPhase)
    }

    def compileUnits(units: List[CompilationUnit], fromPhase: Phase) {
      try compileUnitsInternal(units, fromPhase)
      catch { case ex: Throwable =>
        val shown = if (settings.verbose.value)
           stackTraceString(ex)
         else
           stackTraceHeadString(ex) // note that error stacktraces do not print in fsc

        globalError(supplementErrorMessage("uncaught exception during compilation: " + shown))
        throw ex
      }
    }

    private def compileUnitsInternal(units: List[CompilationUnit], fromPhase: Phase) {
      doInvalidation()

      units foreach addUnit
      val startTime = currentTime

      reporter.reset()
      checkDeprecatedSettings(unitbuf.head)
      globalPhase = fromPhase

     while (globalPhase.hasNext && !reporter.hasErrors) {
        val startTime = currentTime
        phase = globalPhase
        globalPhase.run

        // progress update
        informTime(globalPhase.description, startTime)
        val shouldWriteIcode = (
             (settings.writeICode.isSetByUser && (settings.writeICode containsPhase globalPhase))
          || (!settings.Xprint.doAllPhases && (settings.Xprint containsPhase globalPhase) && runIsAtOptimiz)
        )
        if (shouldWriteIcode) {
          // Write *.icode files when -Xprint-icode or -Xprint:<some-optimiz-phase> was given.
          writeICode()
        } else if ((settings.Xprint containsPhase globalPhase) || settings.printLate.value && runIsAt(cleanupPhase)) {
          // print trees
          if (settings.Xshowtrees.value || settings.XshowtreesCompact.value || settings.XshowtreesStringified.value) nodePrinters.printAll()
          else printAllUnits()
        }

        // print the symbols presently attached to AST nodes
        if (settings.Yshowsyms.value)
          trackerFactory.snapshot()

        // print members
        if (settings.Yshow containsPhase globalPhase)
          showMembers()

        // browse trees with swing tree viewer
        if (settings.browse containsPhase globalPhase)
          treeBrowser browse (phase.name, units)

        // move the pointer
        globalPhase = globalPhase.next

        // run tree/icode checkers
        if (settings.check containsPhase globalPhase.prev)
          runCheckers()

        // output collected statistics
        if (settings.Ystatistics.value)
          statistics.print(phase)

        advancePhase
      }

      if (traceSymbolActivity)
        units map (_.body) foreach (traceSymbols recordSymbolsInTree _)

      // In case no phase was specified for -Xshow-class/object, show it now for sure.
      if (settings.Yshow.isDefault)
        showMembers()

      reportCompileErrors()
      symSource.keys foreach (x => resetPackageClass(x.owner))
      informTime("total", startTime)

      // record dependency data
      if (!dependencyAnalysis.off)
        dependencyAnalysis.saveDependencyAnalysis()

      // Clear any sets or maps created via perRunCaches.
      perRunCaches.clearAll()

      // Reset project
      if (!stopPhase("namer")) {
        enteringPhase(namerPhase) {
          resetProjectClasses(RootClass)
        }
      }
    }

    /** Compile list of abstract files. */
    def compileFiles(files: List[AbstractFile]) {
      try compileSources(files map getSourceFile)
      catch { case ex: IOException => globalError(ex.getMessage()) }
    }

    /** Compile list of files given by their names */
    def compile(filenames: List[String]) {
      try {
        val sources: List[SourceFile] =
          if (settings.script.isSetByUser && filenames.size > 1) returning(Nil)(_ => globalError("can only compile one script at a time"))
          else filenames map getSourceFile

        compileSources(sources)
      }
      catch { case ex: IOException => globalError(ex.getMessage()) }
    }

    /** Compile abstract file until `globalPhase`, but at least
* to phase "namer".
*/
    def compileLate(file: AbstractFile) {
      if (!compiledFiles(file.path))
        compileLate(new CompilationUnit(getSourceFile(file)))
    }

    /** Compile abstract file until `globalPhase`, but at least to phase "namer".
*/
    def compileLate(unit: CompilationUnit) {
      addUnit(unit)

      if (firstPhase ne null) { // we might get here during initialization, is a source is newer than the binary
        val maxId = math.max(globalPhase.id, typerPhase.id)
        firstPhase.iterator takeWhile (_.id < maxId) foreach (ph =>
          enteringPhase(ph)(ph.asInstanceOf[GlobalPhase] applyPhase unit))
        refreshProgress
      }
    }

    /** Reset package class to state at typer (not sure what this
* is needed for?)
*/
    private def resetPackageClass(pclazz: Symbol) {
      enteringPhase(firstPhase) {
        pclazz.setInfo(enteringPhase(typerPhase)(pclazz.info))
      }
      if (!pclazz.isRoot) resetPackageClass(pclazz.owner)
    }
  } // class Run

  def printAllUnits() {
    print("[[syntax trees at end of %25s]]".format(phase))
    exitingPhase(phase)(currentRun.units foreach { unit =>
      nodePrinters showUnit unit
    })
  }

  /** We resolve the class/object ambiguity by passing a type/term name.
*/
  def showDef(fullName: Name, declsOnly: Boolean, ph: Phase) = {
    val boringOwners = Set[Symbol](definitions.AnyClass, definitions.AnyRefClass, definitions.ObjectClass)
    def phased[T](body: => T): T = exitingPhase(ph)(body)
    def boringMember(sym: Symbol) = boringOwners(sym.owner)
    def symString(sym: Symbol) = if (sym.isTerm) sym.defString else sym.toString

    def members(sym: Symbol) = phased(sym.info.members filterNot boringMember map symString)
    def decls(sym: Symbol) = phased(sym.info.decls.toList map symString)
    def bases(sym: Symbol) = phased(sym.info.baseClasses map (x => x.kindString + " " + x.fullName))

    // make the type/term selections walking from the root.
    val syms = findMemberFromRoot(fullName) match {
      // The name as given was not found, so we'll sift through every symbol in
      // the run looking for plausible matches.
      case NoSymbol => phased(currentRun.symSource.keys map (sym => findNamedMember(fullName, sym)) filterNot (_ == NoSymbol) toList)
      // The name as given matched, so show only that.
      case sym => List(sym)
    }

    syms foreach { sym =>
      val name = "\n<<-- %s %s after phase '%s' -->>".format(sym.kindString, sym.fullName, ph.name)
      val baseClasses = bases(sym).mkString("Base classes:\n ", "\n ", "")
      val contents =
        if (declsOnly) decls(sym).mkString("Declarations:\n ", "\n ", "")
        else members(sym).mkString("Members (excluding Any/AnyRef unless overridden):\n ", "\n ", "")

      inform(List(name, baseClasses, contents) mkString "\n\n")
    }
  }

  def getFile(source: AbstractFile, segments: Array[String], suffix: String): File = {
    val outDir = Path(
      settings.outputDirs.outputDirFor(source).path match {
        case "" => "."
        case path => path
      }
    )
    val dir = segments.init.foldLeft(outDir)(_ / _).createDirectory()
    new File(dir.path, segments.last + suffix)
  }

  /** Returns the file with the given suffix for the given class. Used for icode writing. */
  def getFile(clazz: Symbol, suffix: String): File = getFile(clazz.sourceFile, clazz.fullName split '.', suffix)

  private def writeICode() {
    val printer = new icodes.TextPrinter(null, icodes.linearizer)
    icodes.classes.values.foreach((cls) => {
      val suffix = if (cls.symbol.hasModuleFlag) "$.icode" else ".icode"
      val file = getFile(cls.symbol, suffix)
// if (file.exists())
// file = new File(file.getParentFile(), file.getName() + "1")
      try {
        val stream = new FileOutputStream(file)
        printer.setWriter(new PrintWriter(stream, true))
        printer.printClass(cls)
        informProgress("wrote " + file)
      } catch {
        case ex: IOException =>
          if (settings.debug.value) ex.printStackTrace()
        globalError("could not write file " + file)
      }
    })
  }
  def forInteractive = false
  def forScaladoc = false
  def createJavadoc = false
}

object Global {
  def apply(settings: Settings, reporter: Reporter): Global = new Global(settings, reporter)
}
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