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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
* @author Martin Odersky
*/
package scala.tools.nsc
import java.io.{ BufferedOutputStream, FileOutputStream, PrintStream, File => JFile }
import scala.tools.nsc.reporters.{Reporter, ConsoleReporter}
import scala.tools.nsc.util.FakePos //Position
import scala.tools.util.SocketServer
import settings.FscSettings
/**
* The server part of the fsc offline compiler. It awaits compilation
* commands and executes them. It caches a compiler instance so
* that it can respond more quickly.
*
* @author Martin Odersky
* @version 1.0
*/
class StandardCompileServer extends SocketServer {
lazy val compileSocket: CompileSocket = CompileSocket
val versionMsg = "Fast Scala compiler " +
Properties.versionString + " -- " +
Properties.copyrightString
val MaxCharge = 0.8
private var compiler: Global = null
var reporter: ConsoleReporter = _
var shutdown = false
private def exit(code: Int): Nothing = {
System.err.close()
System.out.close()
sys.exit(code)
}
private val runtime = Runtime.getRuntime()
import runtime.{ totalMemory, freeMemory, maxMemory }
/** Create a new compiler instance */
def newGlobal(settings: Settings, reporter: Reporter) =
new Global(settings, reporter) {
override def inform(msg: String) = out.println(msg)
}
override def timeout() {
if (!compileSocket.portFile(port).exists)
fatal("port file no longer exists; skipping cleanup")
}
def printMemoryStats() {
System.out.println("New session, total memory = %s, max memory = %s, free memory = %s".format(
totalMemory, maxMemory, freeMemory))
System.out.flush()
}
def isMemoryFullEnough() = {
runtime.gc()
(totalMemory - freeMemory).toDouble / maxMemory.toDouble > MaxCharge
}
protected def newOfflineCompilerCommand(arguments: List[String], settings: Settings) =
new OfflineCompilerCommand(arguments, settings)
/** Problematically, Settings are only considered equal if every setting
* is exactly equal. In fsc this immediately breaks down because the randomly
* chosen temporary outdirs differ between client and server. Among other
* things. Long term we could use a meaningful equality; short term I'm just
* ignoring options which I can see causing a new compiler instance every time
* and which do not interestingly influence compilation products.
*/
def unequalSettings(s1: Settings, s2: Settings): Set[Settings#Setting] = {
val ignoreSettings = Set("-d", "-encoding", "-verbose")
def trim (s: Settings): Set[Settings#Setting] = (
s.userSetSettings.toSet[Settings#Setting] filterNot (ss => ignoreSettings exists (ss respondsTo _))
)
val ss1 = trim(s1)
val ss2 = trim(s2)
(ss1 union ss2) -- (ss1 intersect ss2)
}
def session() {
printMemoryStats()
val password = compileSocket getPassword port
val guessedPassword = in.readLine()
val input = in.readLine()
def fscError(msg: String): Unit = out println (
FakePos("fsc"),
msg + "\n fsc -help gives more information"
)
if (input == null || password != guessedPassword)
return
val args = input.split("\0", -1).toList
val settings = new FscSettings(fscError)
def logVerbose(msg: String) =
if (settings.verbose.value)
out println msg
val command = newOfflineCompilerCommand(args, settings)
if (settings.shutdown.value) {
shutdown = true
return out.println("[Compile server exited]")
}
if (settings.reset.value) {
compiler = null
return out.println("[Compile server was reset]")
}
reporter = new ConsoleReporter(command.settings, in, out) {
// disable prompts, so that compile server cannot block
override def displayPrompt = ()
}
def isCompilerReusable: Boolean = {
if (compiler == null) {
logVerbose("[Creating new instance for compile server.]")
logVerbose("[Compiler version: " + Properties.versionString + ".]")
return false
}
val unequal = unequalSettings(command.settings, compiler.settings)
if (unequal.nonEmpty) {
logVerbose("[Replacing compiler with new instance because settings are unequal.]")
logVerbose("[Asymmetric settings: " + unequal.mkString(", ") + "]")
}
unequal.isEmpty
}
if (command.shouldStopWithInfo)
reporter.info(null, command.getInfoMessage(newGlobal(command.settings, reporter)), true)
else if (command.files.isEmpty)
reporter.info(null, command.usageMsg, true)
else {
if (isCompilerReusable) {
compiler.settings = command.settings
compiler.reporter = reporter
}
else {
compiler = newGlobal(command.settings, reporter)
}
val c = compiler
val run = new c.Run()
try run compile command.files
catch {
case ex @ FatalError(msg) =>
reporter.error(null, "fatal error: " + msg)
compiler = null
case ex =>
shutdown = true
throw ex
}
}
reporter.printSummary()
if (isMemoryFullEnough) {
logVerbose("Nulling out compiler due to memory utilization.")
compiler = null
}
}
}
object CompileServer extends StandardCompileServer {
/** A directory holding redirected output */
private val redirectDir = (compileSocket.tmpDir / "output-redirects").createDirectory()
private def redirect(setter: PrintStream => Unit, filename: String): Unit =
setter(new PrintStream((redirectDir / filename).createFile().bufferedOutput()))
def main(args: Array[String]) {
redirect(System.setOut, "scala-compile-server-out.log")
redirect(System.setErr, "scala-compile-server-err.log")
System.err.println("...starting server on socket "+port+"...")
System.err.flush()
compileSocket.setPort(port)
run()
compileSocket.deletePort(port)
exit(0)
}
}
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