internal unsafe override void Visit(UIntPtr *loc)
{
UIntPtr addr = *loc;
UIntPtr page = PageTable.Page(addr);
Trace.Log(Trace.Area.Pointer,
"FwdThrRef: loc={0}, addr={1}, page={2}",
__arglist(loc, addr, page));
PageType pageType = PageTable.Type(page);
// if an object "spills" into a page that
// is pinned, and the object is copied
// during a collection, we will end up with
// the first part of the object in a zombie page
// the second part of the object in a GC page.
// We need to find the start of the object and
// use that to determine whether the object has
// been moved.
if (!PageTable.IsZombiePage(pageType) &&
!PageTable.IsGcPage(pageType))
{
VTable.Assert(PageTable.IsNonGcPage(pageType) ||
PageTable.IsStackPage(pageType) ||
PageTable.IsSharedPage(pageType) ||
VTable.BuildC2Mods,
"Semispace:ForwardThreadReference");
return;
}
UIntPtr objectPtr = InteriorPtrTable.Find(addr);
if (objectPtr == addr)
{
generalReferenceVisitor.Visit(loc);
}
else
{
// we can check for the page type of
// objectPtr here to see if it is zombie page.
// If true we can just return.
UIntPtr newObject = objectPtr;
generalReferenceVisitor.Visit(&newObject);
UIntPtr newAddr = newObject + (addr - objectPtr);
Trace.Log(Trace.Area.Pointer,
"FwdThrRef: {0} -> {1}",
__arglist(addr, newAddr));
*loc = newAddr;
}
}
// 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);
}
}
}
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));
return;
}
UIntPtr objectAddr = InteriorPtrTable.Find(addr);
this.threadPtrQueue.Write(objectAddr);
this.threadPtrQueue.Write(addr - objectAddr);
}
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));
return;
}
UIntPtr objectAddr = InteriorPtrTable.Find(addr);
registerThreadReferenceVisitor.threadPtrQueue.Write(objectAddr);
registerThreadReferenceVisitor.threadPtrQueue.Write(addr - objectAddr);
*Allocator.GetObjectVTableAddress(objectAddr) |= (UIntPtr)2U;
}
internal override UIntPtr FindObjectAddr(UIntPtr interiorPtr)
{
return(InteriorPtrTable.Find(interiorPtr));
}
