DLR - 爲什麼調試信息不​​會顯示在我的堆棧跟蹤中？

Question

首先，我讀過Making a CLR/.NET Language Debuggable，但我仍然無法執行此操作。

我寫了一個玩具語言，它通過生成一個Linq表達式，然後調用LambdaExpression＃CompileToMethod。大多數這些表述都附加調試信息，像這樣：

//SmithExpression#InsertDebugInfo 
Expression InsertDebugInfo(Expression expression, DebugInfo debugInfo) { 
    var column = 1; 
    var debugExpr = Expression.DebugInfo(debugInfo.SymbolDocumentInfo 
       ,Info.LineNumber, column, Info.LineNumber, column + 1); 
    return Expression.Block(debugExpr, expression); 
} 

一個debuginfo軟看起來是這樣的：

public class DebugInfo { 
    /* arbitrary value from http://www.famkruithof.net/uuid/uuidgen */ 
    public static Guid SmithGuid = new Guid("83c65910-8376-11e2-9e96-0800200c9a66"); 

    public readonly SymbolDocumentInfo SymbolDocumentInfo; 
    public readonly DebugInfoGenerator DebugPdbGenerator; 

    public DebugInfo(String name) { 
     SymbolDocumentInfo = Expression.SymbolDocument(name, SmithGuid); 
     DebugPdbGenerator = DebugInfoGenerator.CreatePdbGenerator(); 
    } 
} 

整件事是comipled像這樣（你可以忽略關於inits的部分）：

public static Action CompileSmithExpression(SmithExpression sexpression 
      ,DebugInfo debugInfo, Parameter moduleParameter, Expando module) { 
    AssemblyName assemblyName = 
     new AssemblyName(
      "RuntimeHelpers.CompileToSmithExpression helper assembly" 
     ); 
    AssemblyBuilder assemblyBuilder = 
     AppDomain.CurrentDomain.DefineDynamicAssembly(
      assemblyName, AssemblyBuilderAccess.RunAndSave 
     ); 

    ModuleBuilder moduleBuilder = assemblyBuilder 
      .DefineDynamicModule(assemblyName.Name, "onlyModule.dll"); 

    var debugAttributes = 
     DebuggableAttribute.DebuggingModes.Default | 
     DebuggableAttribute.DebuggingModes.DisableOptimizations; 

    ConstructorInfo constructor = 
     typeof(DebuggableAttribute) 
     .GetConstructor(new Type[] { 
      typeof(DebuggableAttribute.DebuggingModes) 
      } 
     ); 
    var cab = new CustomAttributeBuilder(constructor, new object[] { debugAttributes }); 
    assemblyBuilder.SetCustomAttribute(cab); 
    moduleBuilder.SetCustomAttribute(cab); 

    TypeBuilder typeBuilder = 
     moduleBuilder.DefineType("MyDynamicType", TypeAttributes.Public); 

    //inits generates expressions that set 'constant' fields to their values. 
    //the call also adds the 'constant' fields to the typeBuilder. 
    //Must call ToArray() to make it run. 
    var inits = FieldInits(sexpression, typeBuilder).ToArray(); 
    var ex = sexpression.ToExpression(debugInfo); 
    var fullDlrExpression = Expression.Block(inits.Append(ex)); 

    var parameters = new ParameterExpression[] { moduleParameter.DlrParameter }; 
    var lambda = Expression.Lambda(fullDlrExpression, parameters); 

    /* Method will take the module as a parameter. */ 
    MethodBuilder meth = typeBuilder.DefineMethod(
     "MyMethod", 
     MethodAttributes.Public | MethodAttributes.Static, 
     typeof(void), 
     new Type[] { typeof(Expando) }); 

    lambda.CompileToMethod(meth, debugInfo.DebugPdbGenerator); 

    Type madeType = typeBuilder.CreateType(); 

    return() => madeType.GetMethod("MyMethod").Invoke(null, new Object[] { module }); 
} 

運行代碼給出我想要的異常，但不包括表達式的調試信息。我希望它能說「< error_immediate，1 >」。

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.MissingMemberException: Can't invoke member error of [] [] 
at (wrapper dynamic-method) object.CallSite.Target (System.Runtime.CompilerServices.Closure,System.Runtime.CompilerServices.CallSite,Smith.Expando) <IL 0x0004f, 0x00127> 
at System.Dynamic.UpdateDelegates.UpdateAndExecute1<Smith.Expando, object> (System.Runtime.CompilerServices.CallSite,Smith.Expando) <0x0040b> 
at MyDynamicType.MyMethod (Smith.Expando) <IL 0x002bc, 0x00aaa> 
at (wrapper managed-to-native) System.Reflection.MonoMethod.InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&) <IL 0x00016, 0x00067> 
etc... 

我最好的猜測是，調試信息實際上是存在的，但我必須做更多的工作來獲得堆棧跟蹤顯示它。有任何想法嗎？

Answer 1

您的異常是嵌套異常。要打印堆棧跟蹤，請查看InnerException。

catch (Exception ex) 
{ 
    while (ex != null) { 
     Debug.Print(ex.ToString()); 
     ex = ex.InnerException(); 
    } 
}