implement StObj instruction

ICSharpCode.Decompiler/CSharp/ConvertedExpression.cs

@@ -148,7 +148,7 @@ namespace ICSharpCode.Decompiler.CSharp
 				foreach (var inst in parent.Annotations.OfType<ILInstruction>())
 					descendant.AddAnnotation(inst);
 				if (parent == Expression)
-					return new ConvertedExpression(descendant);
+					return new ConvertedExpression(descendant.Detach());
 			}
 			throw new ArgumentException("descendant must be a descendant of the current node");
 		}

ICSharpCode.Decompiler/CSharp/ExpressionBuilder.cs

@@ -450,7 +450,26 @@ namespace ICSharpCode.Decompiler.CSharp
 					.WithRR(new ResolveResult(type));
 			}
 		}
-		
+
+		protected internal override ConvertedExpression VisitStObj(StObj inst)
+		{
+			var target = Convert(inst.Target);
+			var value = Convert(inst.Value);
+			var type = cecilMapper.GetType(inst.Type);
+			ConvertedExpression result;
+			if (target.Type.Equals(new ByReferenceType(type)) && target.Expression is DirectionExpression) {
+				// we can deference the managed reference by stripping away the 'ref'
+				result = target.UnwrapChild(((DirectionExpression)target.Expression).Expression);
+			} else {
+				// Cast pointer type if necessary:
+				target = target.ConvertTo(new PointerType(type), this);
+				result = new UnaryOperatorExpression(UnaryOperatorType.Dereference, target.Expression)
+					.WithoutILInstruction()
+					.WithRR(new ResolveResult(type));
+			}
+			return Assignment(result, value).WithILInstruction(inst);
+		}
+
 		protected internal override ConvertedExpression VisitUnboxAny(UnboxAny inst)
 		{
 			var arg = Convert(inst.Argument);

ICSharpCode.Decompiler/Tests/TestCases/ControlFlow.cs

@@ -41,7 +41,7 @@ class ControlFlow
 	{
 		if (input.Contains("test")) {
 		}
-		result++;
+		result = result + 1;
 		Console.WriteLine("EmptyIf");
 	}
 
@@ -52,7 +52,7 @@ class ControlFlow
 		} else {
 			Console.WriteLine("else");
 		}
-		result++;
+		result = result + 1;
 		Console.WriteLine("end");
 	}
 
@@ -61,7 +61,7 @@ class ControlFlow
 		if (input.Contains("test")) {
 			Console.WriteLine("result");
 		}
-		result++;
+		result = result + 1;
 		Console.WriteLine("end");
 	}
 
@@ -72,14 +72,14 @@ class ControlFlow
 		} else {
 			Console.WriteLine("else");
 		}
-		result++;
+		result = result + 1;
 	}
 
 	static void Test(string input, ref int result)
 	{
 		foreach (char c in input) {
 			Console.Write(c);
-			result++;
+			result = result + 1;
 		}
 		if (input.Contains("test")) {
 			Console.WriteLine("result");