fix AD7MemoryAddress.GetInfo

Author: Trass3r

src/MIDebugEngine/AD7.Impl/AD7MemoryAddress.cs

@@ -39,7 +39,9 @@ public void SetDocumentContext(IDebugDocumentContext2 docContext)
         // Adds a specified value to the current context's address to create a new context.
         public int Add(ulong dwCount, out IDebugMemoryContext2 newAddress)
         {
-            // FIXME: this is not correct for IDebugCodeContext2
+            // NB: this is not correct for IDebugCodeContext2 according to the docs
+            // https://docs.microsoft.com/en-us/visualstudio/extensibility/debugger/reference/idebugcodecontext2#remarks
+            // But it's not used in practice (instead: IDebugDisassemblyStream2.Seek)
             newAddress = new AD7MemoryAddress(_engine, (uint)dwCount + _address, null);
             return Constants.S_OK;
         }
@@ -158,12 +160,19 @@ public int GetInfo(enum_CONTEXT_INFO_FIELDS dwFields, CONTEXT_INFO[] pinfo)
             {
                 pinfo[0].dwFields = 0;
 
-                if ((dwFields & enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS) != 0 ||
-                    (dwFields & enum_CONTEXT_INFO_FIELDS.CIF_ADDRESSABSOLUTE) != 0)
+                if ((dwFields & (enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS | enum_CONTEXT_INFO_FIELDS.CIF_ADDRESSABSOLUTE)) != 0)
                 {
-                    pinfo[0].bstrAddress = EngineUtils.AsAddr(_address, _engine.DebuggedProcess.Is64BitArch);
-                    pinfo[0].bstrAddressAbsolute = pinfo[0].bstrAddress;
-                    pinfo[0].dwFields |= enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS | enum_CONTEXT_INFO_FIELDS.CIF_ADDRESSABSOLUTE;
+                    string addr = EngineUtils.AsAddr(_address, _engine.DebuggedProcess.Is64BitArch);
+                    if ((dwFields & enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS) != 0)
+                    {
+                        pinfo[0].bstrAddress = addr;
+                        pinfo[0].dwFields |= enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS;
+                    }
+                    if ((dwFields & enum_CONTEXT_INFO_FIELDS.CIF_ADDRESSABSOLUTE) != 0)
+                    {
+                        pinfo[0].bstrAddressAbsolute = addr;
+                        pinfo[0].dwFields |= enum_CONTEXT_INFO_FIELDS.CIF_ADDRESSABSOLUTE;
+                    }
                 }
                 // Fields not supported by the sample
                 if ((dwFields & enum_CONTEXT_INFO_FIELDS.CIF_ADDRESSOFFSET) != 0) { }

src/OpenDebugAD7/AD7Impl/AD7BreakPointRequest.cs

@@ -8,7 +8,7 @@
 
 namespace OpenDebugAD7.AD7Impl
 {
-    internal class AD7BreakPointRequest : IDebugBreakpointRequest2, IDebugBreakpointChecksumRequest2
+    internal sealed class AD7BreakPointRequest : IDebugBreakpointRequest2, IDebugBreakpointChecksumRequest2
     {
         private static uint s_nextBreakpointId = 0;
 

src/OpenDebugAD7/AD7Impl/AD7DocumentPosition.cs

@@ -2,13 +2,11 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 using System;
-using System.Globalization;
-using Microsoft.DebugEngineHost;
 using Microsoft.VisualStudio.Debugger.Interop;
 
 namespace OpenDebugAD7.AD7Impl
 {
-    internal class AD7DocumentPosition : IDebugDocumentPosition2, IDebugDocumentPosition110
+    internal sealed class AD7DocumentPosition : IDebugDocumentPosition2, IDebugDocumentPosition110
     {
         public string Path
         {