private string PrintObject(int indentLevel, CorObjectValue ov, int expandDepth, bool canDoFunceval)
{
Debug.Assert(expandDepth >= 0);
bool fNeedToResumeThreads = true;
// Print generics-aware type.
string name = InternalUtil.PrintCorType(this.m_process, ov.ExactType);
StringBuilder txt = new StringBuilder();
txt.Append(name);
if (expandDepth > 0)
{
// we gather the field info of the class before we do
// funceval since funceval requires running the debugger process
// and this in turn can cause GC and invalidate our references.
StringBuilder expandedDescription = new StringBuilder();
if (IsComplexType)
{
foreach (MDbgValue v in GetFields())
{
expandedDescription.Append("\n").Append(IndentedString(indentLevel + 1, v.Name)).
Append("=").Append(IndentedBlock(indentLevel + 2,
v.GetStringValue(expandDepth - 1, false)));
}
}
// if the value we're printing is a nullable type that has no value (is null), we can't do a func eval
// to get its value, since it will be boxed as a null pointer. We already have the information we need, so
// we'll just take care of it now. Note that ToString() for null-valued nullable types just prints the
// empty string.
// bool hasValue = (bool)(GetField("hasValue").CorValue.CastToGenericValue().GetValue());
if (IsNullableType(ov.ExactType) && !(bool)(GetField("hasValue").CorValue.CastToGenericValue().GetValue()))
{
txt.Append(" < >");
}
else if (ov.IsValueClass && canDoFunceval)
// we could display even values for real Objects, but we will just show
// "description" for valueclasses.
{
CorClass cls = ov.ExactType.Class;
CorMetadataImport importer = m_process.Modules.Lookup(cls.Module).Importer;
MetadataType mdType = importer.GetType(cls.Token) as MetadataType;
if (mdType.ReallyIsEnum)
{
txt.AppendFormat(" <{0}>", InternalGetEnumString(ov, mdType));
}
else if (m_process.IsRunning)
txt.Append(" <N/A during run>");
else
{
MDbgThread activeThread = m_process.Threads.Active;
CorValue thisValue;
CorHeapValue hv = ov.CastToHeapValue();
if (hv != null)
{
// we need to pass reference value.
CorHandleValue handle = hv.CreateHandle(CorDebugHandleType.HANDLE_WEAK_TRACK_RESURRECTION);
thisValue = handle;
}
else
thisValue = ov;
try
{
CorEval eval = m_process.Threads.Active.CorThread.CreateEval();
m_process.CorProcess.SetAllThreadsDebugState(CorDebugThreadState.THREAD_SUSPEND,
activeThread.CorThread);
MDbgFunction toStringFunc = m_process.ResolveFunctionName(null, "System.Object", "ToString",
thisValue.ExactType.Class.Module.Assembly.AppDomain);
Debug.Assert(toStringFunc != null); // we should be always able to resolve ToString function.
eval.CallFunction(toStringFunc.CorFunction, new CorValue[] { thisValue });
m_process.Go();
do
{
m_process.StopEvent.WaitOne();
if (m_process.StopReason is EvalCompleteStopReason)
{
CorValue cv = eval.Result;
Debug.Assert(cv != null);
MDbgValue mv = new MDbgValue(m_process, cv);
string valName = mv.GetStringValue(0);
// just purely for esthetical reasons we 'discard' "
if (valName.StartsWith("\"") && valName.EndsWith("\""))
valName = valName.Substring(1, valName.Length - 2);
txt.Append(" <").Append(valName).Append(">");
break;
}
if ((m_process.StopReason is ProcessExitedStopReason) ||
(m_process.StopReason is EvalExceptionStopReason))
{
txt.Append(" <N/A cannot evaluate>");
break;
}
// hitting bp or whatever should not matter -- we need to ignore it
m_process.Go();
}
while (true);
}
catch (COMException e)
{
// Ignore cannot copy a VC class error - Can't copy a VC with object refs in it.
if (e.ErrorCode != (int)HResult.CORDBG_E_OBJECT_IS_NOT_COPYABLE_VALUE_CLASS)
{
throw;
}
}
catch (System.NotImplementedException)
{
fNeedToResumeThreads = false;
}
finally
{
if (fNeedToResumeThreads)
{
// we need to resume all the threads that we have suspended no matter what.
m_process.CorProcess.SetAllThreadsDebugState(CorDebugThreadState.THREAD_RUN,
activeThread.CorThread);
}
}
}
}
txt.Append(expandedDescription.ToString());
}
return txt.ToString();
}
// Builds the friendly string for an enum value
private string InternalGetEnumString(CorObjectValue ov, MetadataType type)
{
Debug.Assert(type != null); // Enums should always have a type
IList<KeyValuePair<string, ulong>> values = type.EnumValues;
// Get the underlying value
ulong value = Convert.ToUInt64(ov.CastToGenericValue().UnsafeGetValueAsType(type.EnumUnderlyingType), CultureInfo.InvariantCulture);
// Find a reasonable value to display
StringBuilder result = new StringBuilder();
ulong remainingValue = value;
bool firstTime = true;
for (int i = values.Count - 1; i >= 0; i--)
{
if ((values[i].Value == value) ||
(type.ReallyIsFlagsEnum && (values[i].Value != 0) && ((values[i].Value & value) == values[i].Value)))
{
remainingValue &= ~(values[i].Value); // Remove the flags from the total needed for flags enums
if (!firstTime)
{
if (type.ReallyIsFlagsEnum)
{
result.Insert(0, ", ");
}
else
{
result.Insert(0, " / ");
}
}
result.Insert(0, values[i].Key);
firstTime = false;
}
}
if (remainingValue != 0)
{
if (firstTime)
{
// No matches whatsoever
result.Insert(0, remainingValue);
}
else
{
// Flags enum with leftover bits
result.AppendFormat(" (Unnamed bits: {0})", remainingValue);
}
}
return result.ToString();
}