1// Licensed to the .NET Foundation under one or more agreements.
2// The .NET Foundation licenses this file to you under the MIT license.
3// See the LICENSE file in the project root for more information.
4
5/*============================================================
6**
7** Class: COMMemoryFailPoint
8**
9**
10** Purpose: Native methods for System.Runtime.MemoryFailPoint.
11** These are to implement memory gates to limit allocations
12** when progress will likely result in an OOM.
13**
14===========================================================*/
15#include "common.h"
16
17#include "frames.h"
18#include "commemoryfailpoint.h"
19
20// Need to know the maximum segment size for both the normal GC heap and the
21// large object heap, as well as the top user-accessible address within the
22// address space (ie, theoretically 2^31 - 1 on a 32 bit machine, but a tad
23// lower in practice). This will help out with 32 bit machines running in
24// 3 GB mode.
25FCIMPL2(void, COMMemoryFailPoint::GetMemorySettings, UINT64* pMaxGCSegmentSize, UINT64* pTopOfMemory)
26{
27 FCALL_CONTRACT;
28
29 IGCHeap * pGC = GCHeapUtilities::GetGCHeap();
30 size_t segment_size = pGC->GetValidSegmentSize(false);
31 size_t large_segment_size = pGC->GetValidSegmentSize(true);
32 _ASSERTE(segment_size < SIZE_T_MAX && large_segment_size < SIZE_T_MAX);
33 if (segment_size > large_segment_size)
34 *pMaxGCSegmentSize = (UINT64) segment_size;
35 else
36 *pMaxGCSegmentSize = (UINT64) large_segment_size;
37
38 // GetTopMemoryAddress returns a void*, which can't be cast
39 // directly to a UINT64 without causing an error from GCC.
40 void * topOfMem = GetTopMemoryAddress();
41 *pTopOfMemory = (UINT64) (size_t) topOfMem;
42}
43FCIMPLEND
44