public EvaluatedObjectContext(DkmVisualizedExpression expr, DkmVisualizedExpression callback_expr): base(expr, callback_expr)
{
DkmEvaluationResult eval = null;
if (expr_.TagValue == DkmVisualizedExpression.Tag.ChildVisualizedExpression)
{
eval = ((DkmChildVisualizedExpression)expr_).EvaluationResult;
}
else
{
eval = DefaultEE.DefaultEval(expr_, true);
}
eval_ = (DkmSuccessEvaluationResult)eval;
// @NOTE: Pretty sure this is reliable
is_pointer_ = eval_.Type.Contains('*');
string fullname = Utility.GetExpressionFullName(expr_);
// Remove any trailing format specifiers.
int comma = fullname.IndexOf(',');
if(comma != -1)
{
fullname = fullname.Substring(0, comma);
}
string base_expr_stub_ = String.Format(
"({0})",
fullname
);
ptr_expr_stub_ = is_pointer_ ?
base_expr_stub_ : String.Format("(&{0})", base_expr_stub_);
}
DkmClrValue IDkmClrResultProvider.GetClrValue(DkmSuccessEvaluationResult evaluationResult)
{
try
{
var dataItem = evaluationResult.GetDataItem<EvalResultDataItem>();
if (dataItem == null)
{
return null;
}
return dataItem.Value;
}
catch (Exception e) when (ExpressionEvaluatorFatalError.CrashIfFailFastEnabled(e))
{
throw ExceptionUtilities.Unreachable;
}
}
DkmClrValue IDkmClrResultProvider.GetClrValue(DkmSuccessEvaluationResult evaluationResult)
{
try
{
var dataItem = evaluationResult.GetDataItem<EvalResultDataItem>();
if (dataItem == null)
{
// We don't know about this result. Call next implementation
return evaluationResult.GetClrValue();
}
return dataItem.Value;
}
catch (Exception e) when (ExpressionEvaluatorFatalError.CrashIfFailFastEnabled(e))
{
throw ExceptionUtilities.Unreachable;
}
}
public static DkmSuccessEvaluationResult Create(DkmInspectionContext InspectionContext, DkmStackWalkFrame StackFrame, string Name, string FullName, DkmEvaluationResultFlags Flags, string Value, string EditableValue, string Type, DkmEvaluationResultCategory Category, DkmEvaluationResultAccessType Access, DkmEvaluationResultStorageType StorageType, DkmEvaluationResultTypeModifierFlags TypeModifierFlags, DkmDataAddress Address, ReadOnlyCollection<DkmCustomUIVisualizerInfo> CustomUIVisualizers, ReadOnlyCollection<DkmModuleInstance> ExternalModules, DkmDataItem DataItem)
{
DkmSuccessEvaluationResult result = new DkmSuccessEvaluationResult
{
InspectionContext = InspectionContext,
Name = Name,
FullName = FullName,
Flags = Flags,
Value = Value,
Type = Type,
Category = Category,
EditableValue = EditableValue,
CustomUIVisualizers = CustomUIVisualizers
};
if (DataItem != null)
{
result.SetDataItem(DkmDataCreationDisposition.CreateNew, DataItem);
}
return result;
}
/* public override DkmChildVisualizedExpression GetMostDerived()
{
foreach (var child in MemberExpressions)
{
var eval = child.Value.EvaluationResult as DkmSuccessEvaluationResult;
if (eval != null && eval.Category == DkmEvaluationResultCategory.MostDerivedClass)
{
return child.Value;
}
}
return null;
}
*/
private void EvaluateChildren()
{
MemberExpressions = new Dictionary<string, DkmChildVisualizedExpression>();
// @TODO: Am assuming that if expr_ is a child expression, it would be more
// efficient to use its EvaluationResult property instead of invoking the default
// evaluator again. However, doing this results in using child UObject expressions which
// have been generated using the custom visualization (since ! specifier is not recursive).
// We really don't want this since we just want the default expansion so we can navigate
// through the members and bases of the class.
// Problem is, don't know how to communicate to the 'UseDefaultEvaluationBehavior'
// implementation to use a default expansion in this particular case. Setting the data
// item on expr_ before calling GetItemsCallback doesn't work, since the expression that
// gets passed through is not actually expr_, but a root visualized expression that was
// created by the EE when visualizing the parent, which we don't have access to.
// As it is, now that we inline the default expansion alongside the addition of the
// 'UE4 Properties' child, this does seem to work. However, not obvious there is any
// performance improvement, also not 100% sure it's safe to use the stored evaluation.
DkmEvaluationResult uobj_eval = null;
if (expr_.TagValue == DkmVisualizedExpression.Tag.ChildVisualizedExpression)
{
uobj_eval = ((DkmChildVisualizedExpression)expr_).EvaluationResult;
}
else
{
uobj_eval = DefaultEE.DefaultEval(callback_expr_, true);
}
eval_ = (DkmSuccessEvaluationResult)uobj_eval;
DkmEvaluationResult[] children;
DkmEvaluationResultEnumContext enum_context;
try
{
callback_expr_.GetChildrenCallback(uobj_eval, 0, callback_expr_.InspectionContext, out children, out enum_context);
// @NOTE: Assuming count will not be large here!!
callback_expr_.GetItemsCallback(enum_context, 0, enum_context.Count, out children);
}
catch
{
return;
}
uint idx = 0;
foreach (var child_eval in children)
{
if (child_eval.TagValue == DkmEvaluationResult.Tag.SuccessResult)
{
var success_eval = child_eval as DkmSuccessEvaluationResult;
Debug.Assert(success_eval != null);
DkmExpressionValueHome home;
if(success_eval.Address != null)
{
home = DkmPointerValueHome.Create(success_eval.Address.Value);
}
else
{
home = DkmFakeValueHome.Create(0);
}
DkmChildVisualizedExpression child = DkmChildVisualizedExpression.Create(
child_eval.InspectionContext,
callback_expr_.VisualizerId,
callback_expr_.SourceId,
child_eval.StackFrame,
home,
child_eval,
expr_,
idx,
null
);
MemberExpressions[child_eval.Name] = child;
}
++idx;
}
}
DkmClrValue IDkmClrResultProvider.GetClrValue(DkmSuccessEvaluationResult successResult)
{
return successResult.GetClrValue();
}
// Assumes already confirmed that we are dealing with a pointer
protected bool IsPointerNull(DkmSuccessEvaluationResult eval)
{
return eval.Address.Value == 0;
}
protected bool IsPointer(DkmSuccessEvaluationResult eval)
{
// @TODO: Confirm reliable. Alternative is to check for '*' within Type property.
return eval.Flags.HasFlag(DkmEvaluationResultFlags.Address);
}