Let the debugger knows DATAS is on

Author: cshung

src/coreclr/debug/daccess/daccess.cpp

@@ -3245,6 +3245,10 @@ ClrDataAccess::QueryInterface(THIS_
     {
         ifaceRet = static_cast<ISOSDacInterface15*>(this);
     }
+    else if (IsEqualIID(interfaceId, __uuidof(ISOSDacInterface16)))
+    {
+        ifaceRet = static_cast<ISOSDacInterface16*>(this);
+    }
     else
     {
         *iface = NULL;

src/coreclr/debug/daccess/dacimpl.h

@@ -817,7 +817,8 @@ class ClrDataAccess
       public ISOSDacInterface12,
       public ISOSDacInterface13,
       public ISOSDacInterface14,
-      public ISOSDacInterface15
+      public ISOSDacInterface15,
+      public ISOSDacInterface16
 {
 public:
     ClrDataAccess(ICorDebugDataTarget * pTarget, ICLRDataTarget * pLegacyTarget=0);
@@ -1225,6 +1226,9 @@ class ClrDataAccess
     // ISOSDacInterface15
     virtual HRESULT STDMETHODCALLTYPE GetMethodTableSlotEnumerator(CLRDATA_ADDRESS mt, ISOSMethodEnum **enumerator);
 
+    // ISOSDacInterface16
+    virtual HRESULT STDMETHODCALLTYPE GetGCDynamicAdaptationMode(int* pDynamicAdaptationMode);
+
     //
     // ClrDataAccess.
     //

src/coreclr/debug/daccess/request.cpp

@@ -3363,6 +3363,24 @@ ClrDataAccess::GetGCHeapStaticData(struct DacpGcHeapDetails *detailsData)
     return hr;
 }
 
+HRESULT
+ClrDataAccess::GetGCDynamicAdaptationMode(int* pDynamicAdaptationMode)
+{
+    SOSDacEnter();
+    if (IsDatasEnabled())
+    {
+        *pDynamicAdaptationMode = *g_gcDacGlobals->dynamic_adaptation_mode;
+        hr = S_OK;
+    }
+    else
+    {
+        *pDynamicAdaptationMode = -1;
+        hr = S_FALSE;
+    }    
+    SOSDacLeave();
+    return hr;
+}
+
 HRESULT
 ClrDataAccess::GetHeapSegmentData(CLRDATA_ADDRESS seg, struct DacpHeapSegmentData *heapSegment)
 {

src/coreclr/debug/daccess/request_common.h

@@ -113,6 +113,11 @@ inline bool IsBackgroundGCEnabled()
     return (g_gcDacGlobals->minor_version_number & 2) == 0;
 }
 
+inline bool IsDatasEnabled()
+{
+    return (g_gcDacGlobals->minor_version_number & 4) != 0;
+}
+
 // Load an instance of dac_gc_heap for the heap pointed by heap.
 // Fields that does not exist in the current gc_heap instance is zero initialized.
 // Return the dac_gc_heap object.

src/coreclr/gc/dac_gcheap_fields.h

@@ -53,4 +53,4 @@ DEFINE_MISSING_FIELD(freeable_uoh_segment)
 DEFINE_ARRAY_FIELD (free_regions,                        dac_region_free_list, FREE_REGION_KINDS)
 #else
 DEFINE_MISSING_FIELD(free_regions)
-#endif // ALL_FIELDS
+#endif // defined(ALL_FIELDS) || defined(USE_REGIONS)

src/coreclr/gc/gc.cpp

@@ -53032,6 +53032,7 @@ bool GCHeap::IsConcurrentGCEnabled()
 void PopulateDacVars(GcDacVars *gcDacVars)
 {
     bool v2 = gcDacVars->minor_version_number >= 2;
+    bool v4 = gcDacVars->minor_version_number >= 4;
 
 #define DEFINE_FIELD(field_name, field_type) offsetof(CLASS_NAME, field_name),
 #define DEFINE_DPTR_FIELD(field_name, field_type) offsetof(CLASS_NAME, field_name),
@@ -53082,6 +53083,9 @@ void PopulateDacVars(GcDacVars *gcDacVars)
 #ifndef BACKGROUND_GC
     gcDacVars->minor_version_number |= 2;
 #endif //!BACKGROUND_GC
+#ifdef DYNAMIC_HEAP_COUNT
+    gcDacVars->minor_version_number |= 4;
+#endif //DYNAMIC_HEAP_COUNT
     gcDacVars->built_with_svr = &g_built_with_svr_gc;
     gcDacVars->build_variant = &g_build_variant;
     gcDacVars->gc_structures_invalid_cnt = const_cast<int32_t*>(&GCScan::m_GcStructuresInvalidCnt);
@@ -53157,6 +53161,14 @@ void PopulateDacVars(GcDacVars *gcDacVars)
     {
         gcDacVars->bookkeeping_start = &gc_heap::bookkeeping_start;
     }
+    if (v4)
+    {
+#ifdef DYNAMIC_HEAP_COUNT
+        gcDacVars->dynamic_adaptation_mode = &gc_heap::dynamic_adaptation_mode;
+#else
+        gcDacVars->dynamic_adaptation_mode = nullptr;
+#endif //DYNAMIC_HEAP_COUNT
+    }
 }
 
 int GCHeap::RefreshMemoryLimit()

src/coreclr/gc/gcinterface.dacvars.def

@@ -88,6 +88,9 @@ GC_DAC_VAL        (int,                   total_bookkeeping_elements)
 GC_DAC_VAL        (int,                   count_free_region_kinds)
 GC_DAC_VAL        (size_t,                card_table_info_size)
 
+// Here is where v5.4 fields starts
+GC_DAC_VAR        (int,                   dynamic_adaptation_mode)
+
 #undef GC_DAC_VAR
 #undef GC_DAC_ARRAY_VAR
 #undef GC_DAC_PTR_VAR

src/coreclr/gc/gcinterface.h

@@ -11,7 +11,7 @@
 // The minor version of the IGCHeap interface. Non-breaking changes are required
 // to bump the minor version number. GCs and EEs with minor version number
 // mismatches can still interoperate correctly, with some care.
-#define GC_INTERFACE_MINOR_VERSION 3
+#define GC_INTERFACE_MINOR_VERSION 4
 
 // The major version of the IGCToCLR interface. Breaking changes to this interface
 // require bumps in the major version number.

src/coreclr/inc/sospriv.idl

@@ -562,3 +562,13 @@ interface ISOSDacInterface15 : IUnknown
 {
     HRESULT GetMethodTableSlotEnumerator(CLRDATA_ADDRESS mt, ISOSMethodEnum **enumerator);
 }
+
+[
+    object,
+    local,
+    uuid(4ba12ff8-daac-4e43-ac56-98cf8d5c595d)
+]
+interface ISOSDacInterface16 : IUnknown
+{
+    HRESULT GetGCDynamicAdaptationMode(int* pDynamicAdaptationMode);
+}

src/coreclr/pal/prebuilt/idl/sospriv_i.cpp

@@ -127,6 +127,9 @@ MIDL_DEFINE_GUID(IID, IID_ISOSMethodEnum,0x3c0fe725,0xc324,0x4a4f,0x81,0x00,0xd3
 
 MIDL_DEFINE_GUID(IID, IID_ISOSDacInterface15,0x7ed81261,0x52a9,0x4a23,0xa3,0x58,0xc3,0x31,0x3d,0xea,0x30,0xa8);
 
+
+MIDL_DEFINE_GUID(IID, IID_ISOSDacInterface16,0x4ba12ff8,0xdaac,0x4e43,0xac,0x56,0x98,0xcf,0x8d,0x5c,0x59,0x5d);
+
 #undef MIDL_DEFINE_GUID
 
 #ifdef __cplusplus