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Commit 533893e2 authored by Kunshan Wang's avatar Kunshan Wang
Browse files

GC: HexDump when header is 0

parent ef89c4e5
......@@ -12,6 +12,7 @@ import org.slf4j.LoggerFactory
import com.typesafe.scalalogging.Logger
import scala.collection.mutable.ArrayBuffer
import uvm.refimpl.UvmRefImplException
import uvm.utils.HexDump
object SimpleImmixCollector {
val logger = Logger(LoggerFactory.getLogger(getClass.getName))
......@@ -238,6 +239,18 @@ class SimpleImmixCollector(val heap: SimpleImmixHeap, val space: SimpleImmixSpac
private def maybeMove(toObj: Word, updateFunc: Word => Unit): Option[Word] = {
val oldHeader = HeaderUtils.getTag(toObj)
logger.debug("GC header of 0x%x is 0x%x".format(toObj, oldHeader))
if (oldHeader == 0x0L) {
logger.error("Header is zero! GC header of 0x%x is 0x%x".format(toObj, oldHeader))
val plusMinus = 256L
val memDump = HexDump.dumpMemory(toObj-plusMinus, plusMinus*2L)
logger.error("Memory dump:\n"+memDump)
throw new UvmRefImplException("Header is zero! obj: 0x%x, header: 0x%x".format(toObj, oldHeader))
val markBit = oldHeader & MARK_MASK
val moveBit = oldHeader & MOVE_MASK
val wasMarked = markBit != 0
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