1 files changed, 43 insertions, 0 deletions
diff --git a/src/vm/commemoryfailpoint.cpp b/src/vm/commemoryfailpoint.cpp
new file mode 100644
index 0000000000..276a9f305a
--- /dev/null
+++ b/src/vm/commemoryfailpoint.cpp
@@ -0,0 +1,43 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*============================================================
+**
+** Class: COMMemoryFailPoint
+**
+**
+** Purpose: Native methods for System.Runtime.MemoryFailPoint.
+** These are to implement memory gates to limit allocations
+** when progress will likely result in an OOM.
+**
+===========================================================*/
+#include "common.h"
+
+#include "frames.h"
+#include "commemoryfailpoint.h"
+
+// Need to know the maximum segment size for both the normal GC heap and the
+// large object heap, as well as the top user-accessible address within the
+// address space (ie, theoretically 2^31 - 1 on a 32 bit machine, but a tad 
+// lower in practice).  This will help out with 32 bit machines running in 
+// 3 GB mode.
+FCIMPL2(void, COMMemoryFailPoint::GetMemorySettings, UINT64* pMaxGCSegmentSize, UINT64* pTopOfMemory)
+{
+    FCALL_CONTRACT;
+
+    GCHeap * pGC = GCHeap::GetGCHeap();
+    size_t segment_size = pGC->GetValidSegmentSize(FALSE);
+    size_t large_segment_size = pGC->GetValidSegmentSize(TRUE);
+    _ASSERTE(segment_size < SIZE_T_MAX && large_segment_size < SIZE_T_MAX);
+    if (segment_size > large_segment_size)
+        *pMaxGCSegmentSize = (UINT64) segment_size;
+    else
+        *pMaxGCSegmentSize = (UINT64) large_segment_size;
+
+    // GetTopMemoryAddress returns a void*, which can't be cast
+    // directly to a UINT64 without causing an error from GCC.
+    void * topOfMem = GetTopMemoryAddress();
+    *pTopOfMemory = (UINT64) (size_t) topOfMem;
+}
+FCIMPLEND