Fixed SD2-505: Debugger freezes on StackOverflowException

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@667 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Pads/CallStackPad.cs

@@ -196,6 +196,7 @@ namespace ICSharpCode.SharpDevelop.Gui.Pads
 			bool showArgumentValues = ShowArgumentValues;
 			bool showExternalMethods = ShowExternalMethods;
 			bool lastItemIsExternalMethod = false;
+			int callstackItems = 0;
 			
 			callStackList.BeginUpdate();
 			callStackList.Items.Clear();
@@ -253,6 +254,8 @@ namespace ICSharpCode.SharpDevelop.Gui.Pads
 					item.Tag = f;
 					item.ForeColor = f.HasSymbols ? Color.Black : Color.Gray;
 					callStackList.Items.Add(item);
+					callstackItems++;
+					if (callstackItems >= 100) break;
 				}
 			}
 			callStackList.EndUpdate();

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Threads/Exception.cs

@@ -54,13 +54,20 @@ namespace DebuggerLibrary
 			}
 			
 			callstack = "";
+			int callstackItems = 0;
 			foreach(Function function in thread.Callstack) {
+				if (callstackItems >= 100) {
+					callstack += "...\n";
+					break;
+				}
+				
 				SourcecodeSegment loc = function.NextStatement;
 				callstack += function.Name + "()";
 				if (loc != null) {
 					callstack += " - " + loc.SourceFullFilename + ":" + loc.StartLine + "," + loc.StartColumn;
 				}
 				callstack += "\n";
+				callstackItems++;
 			}
 			
 			type = runtimeVariable.Type;

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Threads/Thread.cs

@@ -185,11 +185,9 @@ namespace DebuggerLibrary
 			}
 		}
 
-		public unsafe List<Function> Callstack {
+		public IEnumerable<Function> Callstack {
 			get {
-				List<Function> callstack = new List<Function>();
-
-				if (process.IsRunning) return callstack;
+				if (process.IsRunning) yield break;
 				
 				ICorDebugChainEnum corChainEnum;
 				corThread.EnumerateChains(out corChainEnum);
@@ -207,23 +205,23 @@ namespace DebuggerLibrary
 					ICorDebugFrameEnum corFrameEnum;
 					corChains[0].EnumerateFrames(out corFrameEnum);
 					
-					for(;;)
-					{
+					while (true) {
 						uint framesFetched;
 						ICorDebugFrame[] corFrames = new ICorDebugFrame[1]; // Only one at time
 						corFrameEnum.Next(1, corFrames, out framesFetched);
 						if (framesFetched == 0) break; // We are done
 						
+						Function function = null;
 						try {
 							if (corFrames[0] is ICorDebugILFrame) {
-								callstack.Add(new Function(debugger, (ICorDebugILFrame)corFrames[0]));
+								function = new Function(debugger, (ICorDebugILFrame)corFrames[0]);
 							}
 						} catch (COMException) {
 							// TODO
 						};
+						yield return function;
+					}
 				}
-				} // for(;;)
-				return callstack;
 			} // get
 		} // End of public FunctionCollection Callstack
 		
@@ -268,14 +266,16 @@ namespace DebuggerLibrary
 			}
 		}
 		
+		/// <summary>
+		/// Returns the most recent function on callstack.
+		/// Returns null if callstack is empty.
+		/// </summary>
 		public Function LastFunction {
 			get {
-				List<Function> callstack = Callstack;
-				if (callstack.Count > 0) {
-					return Callstack[0];
-				} else {
-					return null;
+				foreach(Function function in Callstack) {
+					return function;
 				}
+				return null;
 			}
 		}
 	}