IsAllGCPointers

src/coreclr/vm/array.cpp

@@ -584,16 +584,14 @@ MethodTable* Module::CreateArrayMethodTable(TypeHandle elemTypeHnd, CorElementTy
     }
 
     // Set up GC information
-    if (CorTypeInfo::IsObjRef(elemType))
+    if (CorTypeInfo::IsObjRef(elemType) || pMT->IsAllGCPointers())
     {
-        CGCDescSeries  *pSeries;
-
         pMT->SetContainsPointers();
 
         // This array is all GC Pointers
         CGCDesc::GetCGCDescFromMT(pMT)->Init( pMT, 1 );
 
-        pSeries = CGCDesc::GetCGCDescFromMT(pMT)->GetHighestSeries();
+        CGCDescSeries* pSeries = CGCDesc::GetCGCDescFromMT(pMT)->GetHighestSeries();
 
         pSeries->SetSeriesOffset(ArrayBase::GetDataPtrOffset(pMT));
         // For arrays, the size is the negative of the BaseSize (the GC always adds the total

src/coreclr/vm/methodtable.cpp

@@ -1761,6 +1761,21 @@ BOOL MethodTable::CanShareVtableChunksFrom(MethodTable *pTargetMT, Module *pCurr
     return pTargetMT->GetLoaderModule() == pCurrentLoaderModule;
 }
 
+BOOL MethodTable::IsAllGCPointers()
+{
+    if (this->ContainsPointers())
+    {
+        // check for canonical GC encoding for all-pointer types
+        CGCDescSeries* pSeries = CGCDesc::GetCGCDescFromMT(this)->GetHighestSeries();
+        return pSeries->GetSeriesCount() == 1 &&
+            pSeries->GetSeriesOffset() == this->GetBaseSize() - sizeof(size_t) &&
+            pSeries->GetSeriesSize() - this->GetBaseSize() == 0;
+    }
+
+    return false;
+}
+
+
 #ifdef _DEBUG
 
 void

src/coreclr/vm/methodtable.h

@@ -1582,6 +1582,7 @@ class MethodTable
         LIMITED_METHOD_CONTRACT;
         return GetFlag(enum_flag_ContainsPointers);
     }
+
     BOOL            Collectible()
     {
         LIMITED_METHOD_CONTRACT;
@@ -1591,6 +1592,7 @@ class MethodTable
         return FALSE;
 #endif
     }
+
     BOOL            ContainsPointersOrCollectible()
     {
         LIMITED_METHOD_CONTRACT;
@@ -1602,6 +1604,8 @@ class MethodTable
 
     BOOL            IsNotTightlyPacked();
 
+    BOOL            IsAllGCPointers();
+
     void SetContainsPointers()
     {
         LIMITED_METHOD_CONTRACT;