SD2-1443 - Moving mouse over "ref" parameter after stack overflow causes exception

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3452 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Control/Eval.cs

@@ -124,6 +124,9 @@ namespace Debugger
 					// The operation failed because it is a GC unsafe point. (Exception from HRESULT: 0x80131C23)
 					// This can probably happen when we break and the thread is in native code
 					throw new GetValueException("Thread is in GC unsafe point");
+				} else if ((uint)e.ErrorCode == 0x80131C22) {
+					// The operation is illegal because of a stack overflow.
+					throw new GetValueException("Can not evaluate after stack overflow");
 				} else {
 					throw;
 				}

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Control/StackFrame.cs

@@ -317,7 +317,17 @@ namespace Debugger
 			}
 			// Method arguments can be passed 'by ref'
 			if (corValue.Type == (uint)CorElementType.BYREF) {
+				try {
 					corValue = corValue.CastTo<ICorDebugReferenceValue>().Dereference();
+				} catch (COMException e) {
+					if ((uint)e.ErrorCode == 0x80131305) {
+						// A reference value was found to be bad during dereferencing.
+						// This can sometimes happen after a stack overflow
+						throw new GetValueException("Bad reference");
+					} else {
+						throw;
+					}
+				}
 			}
 			return corValue;
 		}