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/* dotc
* Copyright 2005-2015 LAMP/EPFL
* @author Martin Odersky
*/
package dotty.tools
package dotc
import core._
import Contexts._
import Symbols._
import SymDenotations._
import typer.FrontEnd
import Phases.Phase
import util._
import reporting.Reporter
import Decorators._
import dotty.tools.dotc.transform.Pickler
import tasty.DottyUnpickler
import ast.tpd._
import NameKinds.QualifiedName
/** Compiler for TASTY files.
* Usage:
*
* scala dotty.tools.dotc.FromTasty (option | classname)*
*
* Options are as for dotc.
* Classnames are fully qualified names of top-level classes that need to have a TASTY attribute.
* Example:
*
* scala dotty.tools.dotc.FromTasty -Xprint:front extMethods.T
*/
object FromTasty extends Driver {
override def newCompiler(implicit ctx: Context): Compiler = new TASTYCompiler
class TASTYCompiler extends Compiler {
override def phases: List[List[Phase]] = {
val backendPhases = super.phases.dropWhile {
case List(_: Pickler) => false
case _ => true
}.tail
List(new ReadTastyTreesFromClasses) :: backendPhases
}
override def newRun(implicit ctx: Context): Run = {
reset()
new TASTYRun(this)(rootContext)
}
}
class TASTYRun(comp: Compiler)(implicit ctx: Context) extends Run(comp) {
override def compile(classNames: List[String]) = {
units = classNames.map(new TASTYCompilationUnit(_))
compileUnits()
}
}
class TASTYCompilationUnit(val className: String) extends CompilationUnit(NoSource) {
override def toString = s"class file $className"
}
object force extends TreeTraverser {
def traverse(tree: Tree)(implicit ctx: Context): Unit = traverseChildren(tree)
}
class ReadTastyTreesFromClasses extends FrontEnd {
override def isTyper = false
override def runOn(units: List[CompilationUnit])(implicit ctx: Context): List[CompilationUnit] =
units.map(readTASTY)
def readTASTY(unit: CompilationUnit)(implicit ctx: Context): CompilationUnit = unit match {
case unit: TASTYCompilationUnit =>
val className = unit.className.toTypeName
val clsd =
if (className.is(QualifiedName)) ctx.base.staticRef(className)
else defn.EmptyPackageClass.info.decl(className)
def cannotUnpickle(reason: String) = {
ctx.error(s"class $className cannot be unpickled because $reason")
unit
}
clsd match {
case clsd: ClassDenotation =>
clsd.infoOrCompleter match {
case info: ClassfileLoader =>
info.load(clsd) match {
case Some(unpickler: DottyUnpickler) =>
val List(unpickled) = unpickler.body(ctx.addMode(Mode.ReadPositions))
val unit1 = new CompilationUnit(new SourceFile(clsd.symbol.sourceFile, Seq()))
unit1.tpdTree = unpickled
unit1.unpicklers += (clsd.classSymbol -> unpickler.unpickler)
force.traverse(unit1.tpdTree)
unit1
case _ =>
cannotUnpickle(s"its class file ${info.classfile} does not have a TASTY attribute")
}
case info =>
cannotUnpickle(s"its info of type ${info.getClass} is not a ClassfileLoader")
}
case _ =>
ctx.error(s"class not found: $className")
unit
}
}
}
}
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