internal override void EnableHeap()
{
base.EnableHeap();
// Ensure that we don't call any type initializers during a GC
ArrayList pageList = new ArrayList();
pageList.Add(new UIntPtr(11));
pageList.Add(new UIntPtr(10));
UIntPtrComparer comparer = new UIntPtrComparer();
pageList.Sort(comparer);
}
// BUGBUG: We are allocating an ArrayList while the collector
// is running. If the ArrayList gets big enough to be
// allocated in the older generation, then the RemSet has the
// potential to overflow since the boxed integers will reside
// in the young generation. We should eventually eliminate
// the use of ArrayList in this class as well as avoid boxing
// the page indices.
internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
UIntPtr page = PageTable.Page(addr);
PageType pageType = PageTable.Type(page);
if (!PageTable.IsZombiePage(pageType))
{
VTable.Assert(PageTable.IsGcPage(pageType) ||
PageTable.IsNonGcPage(pageType) ||
PageTable.IsStackPage(pageType) ||
PageTable.IsSharedPage(pageType) ||
VTable.BuildC2Mods,
"Semispace:RegisterPinnedReference:1");
return;
}
PageType gen = PageTable.ZombieToLive(pageType);
UIntPtr pinnedObjectAddr = InteriorPtrTable.Find(addr);
if (pinnedPageList == null)
{
pinnedPageList = new ArrayList();
comparer = new UIntPtrComparer();
}
Object pinnedObject = Magic.fromAddress(pinnedObjectAddr);
UIntPtr objectSize =
ObjectLayout.ObjectSize(pinnedObjectAddr,
pinnedObject.vtable);
UIntPtr beforeObjectAddr = pinnedObjectAddr - PreHeader.Size;
UIntPtr pastObjectAddr = beforeObjectAddr + objectSize;
UIntPtr firstPage = PageTable.Page(beforeObjectAddr);
UIntPtr lastPage = PageTable.Page(pastObjectAddr - 1);
for (UIntPtr i = firstPage; i <= lastPage; i++)
{
if (!pinnedPageList.Contains(i))
{
Trace.Log(Trace.Area.Pointer,
"RegPin: ptr={0} page={1} gen={2}",
__arglist(pinnedObjectAddr, i, gen));
GenerationalCollector.gcPromotedTable[(int)gen - 1] +=
PageTable.PageSize;
pinnedPageList.Add(i);
}
}
}