Add ShowChildIndexInBlock option to make debugging of larger blocks easier.

ICSharpCode.Decompiler/IL/ILAstWritingOptions.cs

@@ -26,6 +26,7 @@ namespace ICSharpCode.Decompiler.IL
 		private bool useLogicOperationSugar;
 		private bool useFieldSugar;
 		private bool showILRanges;
+		private bool showChildIndexInBlock;
 
 		/// <summary>
 		/// Sugar for logic.not/and/or.
@@ -66,6 +67,19 @@ namespace ICSharpCode.Decompiler.IL
 			}
 		}
 
+		/// <summary>
+		/// Show the child index of the instruction in ILAst output.
+		/// </summary>
+		public bool ShowChildIndexInBlock {
+			get { return showChildIndexInBlock; }
+			set {
+				if (showChildIndexInBlock != value) {
+					showChildIndexInBlock = value;
+					OnPropertyChanged();
+				}
+			}
+		}
+
 		protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
 		{
 			OnPropertyChanged(new PropertyChangedEventArgs(propertyName));

ICSharpCode.Decompiler/IL/Instructions/Block.cs

@@ -161,7 +161,12 @@ namespace ICSharpCode.Decompiler.IL
 			output.MarkFoldStart("{...}");
 			output.WriteLine("{");
 			output.Indent();
+			int index = 0;
 			foreach (var inst in Instructions) {
+				if (options.ShowChildIndexInBlock) {
+					output.Write("[" + index + "] ");
+					index++;
+				}
 				inst.WriteTo(output, options);
 				output.WriteLine();
 			}

ILSpy/DebugSteps.xaml

@@ -11,6 +11,7 @@
 			<CheckBox Margin="3" Content="UseFieldSugar" IsChecked="{Binding UseFieldSugar, Source={x:Static local:DebugSteps.Options}}" />
 			<CheckBox Margin="3" Content="UseLogicOperationSugar"  IsChecked="{Binding UseLogicOperationSugar, Source={x:Static local:DebugSteps.Options}}" />
 			<CheckBox Margin="3" Content="ShowILRanges"  IsChecked="{Binding ShowILRanges, Source={x:Static local:DebugSteps.Options}}" />
+			<CheckBox Margin="3" Content="ShowChildIndexInBlock"  IsChecked="{Binding ShowChildIndexInBlock, Source={x:Static local:DebugSteps.Options}}" />
 		</StackPanel>
 		<TreeView Name="tree" MouseDoubleClick="ShowStateAfter_Click" KeyDown="tree_KeyDown">
 			<TreeView.ItemTemplate>