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package dotty.tools
package dotc
package core
package pickling
import Contexts._, SymDenotations._
import dotty.tools.dotc.ast.tpd
import TastyUnpickler._, TastyBuffer._
import util.Positions._
import PositionUnpickler._
object DottyUnpickler {
/** Exception thrown if classfile is corrupted */
class BadSignature(msg: String) extends RuntimeException(msg)
}
/** A class for unpickling Tasty trees and symbols.
* @param bytes the bytearray containing the Tasty file from which we unpickle
*/
class DottyUnpickler(bytes: Array[Byte]) {
import tpd._
private val unpickler = new TastyUnpickler(bytes)
private val treeUnpickler = unpickler.unpickle(new TreeSectionUnpickler).get
/** Enter all toplevel classes and objects into their scopes
* @param roots a set of SymDenotations that should be overwritten by unpickling
*/
def enter(roots: Set[SymDenotation])(implicit ctx: Context): Unit =
treeUnpickler.enterTopLevel(roots)
/** The unpickled trees
* @param readPositions if true, trees get decorated with position information.
*/
def body(readPositions: Boolean = false)(implicit ctx: Context): List[Tree] = {
if (readPositions)
for ((totalRange, positions) <- unpickler.unpickle(new PositionsSectionUnpickler()))
treeUnpickler.usePositions(totalRange, positions)
treeUnpickler.unpickle()
}
private class TreeSectionUnpickler extends SectionUnpickler[TreeUnpickler]("ASTs") {
def unpickle(reader: TastyReader, tastyName: TastyName.Table) =
new TreeUnpickler(reader, tastyName)
}
private class PositionsSectionUnpickler extends SectionUnpickler[(Position, AddrToPosition)]("Positions") {
def unpickle(reader: TastyReader, tastyName: TastyName.Table) =
new PositionUnpickler(reader).unpickle()
}
}
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