Add ILStackWasEmpty flag to default.value

ICSharpCode.Decompiler/ICSharpCode.Decompiler.csproj

@@ -273,6 +273,7 @@
     <Compile Include="DotNetCore\DotNetCorePathFinderExtensions.cs" />
     <Compile Include="DotNetCore\UnresolvedAssemblyNameReference.cs" />
     <Compile Include="IL\Instructions\CallIndirect.cs" />
+    <Compile Include="IL\Instructions\DefaultValue.cs" />
     <Compile Include="IL\Transforms\EarlyExpressionTransforms.cs" />
     <Compile Include="IL\Transforms\ProxyCallReplacer.cs" />
     <Compile Include="IL\Instructions\StringToInt.cs" />

ICSharpCode.Decompiler/IL/ILReader.cs

@@ -1010,7 +1010,9 @@ namespace ICSharpCode.Decompiler.IL
 
 		ILInstruction InitObj(ILInstruction target, IType type)
 		{
-			return new StObj(target, new DefaultValue(type), type);
+			var value = new DefaultValue(type);
+			value.ILStackWasEmpty = currentStack.IsEmpty;
+			return new StObj(target, value, type);
 		}
 		
 		private ILInstruction DecodeConstrainedCall()

ICSharpCode.Decompiler/IL/Instructions/DefaultValue.cs

@@ -0,0 +1,33 @@
+// Copyright (c) 2017 Siegfried Pammer
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ICSharpCode.Decompiler.IL
+{
+	partial class DefaultValue
+	{
+		/// <summary>
+		/// Gets whether the IL stack was empty at the point of this instruction.
+		/// (not counting the argument of the instruction itself)
+		/// </summary>
+		public bool ILStackWasEmpty;
+	}
+}