GetAppDomainList cDAC implementation (#117515)

* adding GetAppDomainList cDAC API

* cleanup

* rebasing onto GetAssemblyModuleList

Co-authored-by: Max Charlamb <[email protected]>

---------

Co-authored-by: Rachel Jarvi <[email protected]>
Co-authored-by: Max Charlamb <[email protected]>

Author: 3 people

src/native/managed/cdac/mscordaccore_universal/Legacy/SOSDacImpl.cs

@@ -113,7 +113,45 @@ int ISOSDacInterface.GetAppDomainConfigFile(ClrDataAddress appDomain, int count,
     int ISOSDacInterface.GetAppDomainData(ClrDataAddress addr, void* data)
         => _legacyImpl is not null ? _legacyImpl.GetAppDomainData(addr, data) : HResults.E_NOTIMPL;
     int ISOSDacInterface.GetAppDomainList(uint count, [In, MarshalUsing(CountElementName = "count"), Out] ClrDataAddress[] values, uint* pNeeded)
-        => _legacyImpl is not null ? _legacyImpl.GetAppDomainList(count, values, pNeeded) : HResults.E_NOTIMPL;
+    {
+        int hr = HResults.S_OK;
+        try
+        {
+            uint i = 0;
+            TargetPointer appDomainPointer = _target.ReadGlobalPointer(Constants.Globals.AppDomain);
+            TargetPointer appDomain = _target.ReadPointer(appDomainPointer);
+
+            if (appDomain != TargetPointer.Null && values.Length > 0)
+            {
+                values[0] = appDomain.ToClrDataAddress(_target);
+                i = 1;
+            }
+
+            if (pNeeded is not null)
+            {
+                *pNeeded = i;
+            }
+        }
+        catch (System.Exception ex)
+        {
+            hr = ex.HResult;
+        }
+#if DEBUG
+        if (_legacyImpl is not null)
+        {
+            ClrDataAddress[] valuesLocal = new ClrDataAddress[count];
+            uint neededLocal;
+            int hrLocal = _legacyImpl.GetAppDomainList(count, valuesLocal, &neededLocal);
+            Debug.Assert(hrLocal == hr, $"cDAC: {hr:x}, DAC: {hrLocal:x}");
+            Debug.Assert(pNeeded == null || *pNeeded == neededLocal);
+            if (values is not null && values.Length > 0 && valuesLocal.Length > 0)
+            {
+                Debug.Assert(values[0] == valuesLocal[0], $"cDAC: {values[0]:x}, DAC: {valuesLocal[0]:x}");
+            }
+        }
+#endif
+        return hr;
+    }
     int ISOSDacInterface.GetAppDomainName(ClrDataAddress addr, uint count, char* name, uint* pNeeded)
         => _legacyImpl is not null ? _legacyImpl.GetAppDomainName(addr, count, name, pNeeded) : HResults.E_NOTIMPL;
     int ISOSDacInterface.GetAppDomainStoreData(void* data)