Extend the lifetime of StackFrame

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@3233 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/TreeModel/Utils.cs

@@ -31,12 +31,6 @@ namespace Debugger.AddIn.TreeModel
 				throw new AbortedBecauseDebuggeeResumedException();
 			}
 		}
-		
-		public static WindowsDebugger WindowsDebugger {
-			get {
-				return (WindowsDebugger)DebuggerService.CurrentDebugger;
-			}
-		}
 	}
 	
 	public class AbortedBecauseDebuggeeResumedException: System.Exception

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Control/Process-StateControl.cs

@@ -101,6 +101,7 @@ namespace Debugger
 		internal void RaisePausedEvents()
 		{
 			DisableAllSteppers();
+			CheckSelectedStackFrames();
 			SelectMostRecentStackFrameWithLoadedSymbols();
 			
 			if (this.PauseSession.PausedReason == PausedReason.Exception) {
@@ -262,6 +263,19 @@ namespace Debugger
 			}
 		}
 		
+		internal void CheckSelectedStackFrames()
+		{
+			foreach(Thread thread in this.Threads) {
+				if (thread.IsInValidState) {
+					if (thread.SelectedStackFrame != null && thread.SelectedStackFrame.IsInvalid) {
+						thread.SelectedStackFrame = null;
+					}
+				} else {
+					thread.SelectedStackFrame = null;
+				}
+			}
+		}
+		
 		internal void SelectMostRecentStackFrameWithLoadedSymbols()
 		{
 			SelectSomeThread();

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Control/StackFrame.cs

@@ -74,11 +74,15 @@ namespace Debugger
 			}
 		}
 		
-		/// <summary> Returns true is this incance can not be used any more.
+		/// <summary> Returns true is this incance can not be used any more. </summary>
-		/// Stack frame is valid only until the debugee is resumed. </summary>
 		public bool IsInvalid {
 			get {
-				return this.corILFramePauseSession != process.PauseSession;
+				try {
+					object frame = this.CorILFrame;
+					return false;
+				} catch (DebuggerException) {
+					return true;
+				}
 			}
 		}
 		
@@ -108,7 +112,13 @@ namespace Debugger
 		
 		internal ICorDebugILFrame CorILFrame {
 			get {
-				if (this.IsInvalid) throw new DebuggerException("StackFrame is not valid anymore");
+				if (corILFramePauseSession != this.Process.PauseSession) {
+					// Reobtain the stackframe
+					StackFrame stackFrame = this.Thread.GetStackFrameAt(chainIndex, frameIndex);
+					if (stackFrame.MethodInfo != this.MethodInfo) throw new DebuggerException("The stack frame on the thread does not represent the same method anymore");
+					corILFrame = stackFrame.corILFrame;
+					corILFramePauseSession = stackFrame.corILFramePauseSession;
+				}
 				return corILFrame;
 			}
 		}
@@ -121,13 +131,6 @@ namespace Debugger
 			}
 		}
 		
-		internal StackFrame Reobtain()
-		{
-			StackFrame stackFrame = this.Thread.GetStackFrameAt(chainIndex, frameIndex);
-			if (stackFrame.MethodInfo != this.MethodInfo) throw new DebuggerException("The stack frame on the thread does not represent the same method anymore");
-			return stackFrame;
-		}
-		
 		SourcecodeSegment GetSegmentForOffet(uint offset)
 		{
 			return SourcecodeSegment.Resolve(this.MethodInfo.Module, corFunction, offset);

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Internal/ManagedCallback.cs

@@ -107,8 +107,9 @@ namespace Debugger
 		{
 			if (process.PauseSession.PausedReason == PausedReason.EvalComplete ||
 			    process.PauseSession.PausedReason == PausedReason.ExceptionIntercepted) {
-				process.SelectMostRecentStackFrameWithLoadedSymbols();
 				process.DisableAllSteppers();
+				process.CheckSelectedStackFrames();
+				// Do not set selected stack frame
 				// Do not raise events
 			} else {
 				// Raise the pause event outside the callback

src/AddIns/Misc/Debugger/Debugger.Tests/Project/Src/TestPrograms/FunctionLifetime.cs

@@ -84,13 +84,13 @@ namespace Debugger.Tests {
     <DebuggingPaused>Break FunctionLifetime.cs:29,4-29,40</DebuggingPaused>
     <Old_StackFrame>
       <StackFrame
-        ArgumentCount="{Exception: StackFrame is not valid anymore}"
+        ArgumentCount="1"
         ChainIndex="1"
         FrameIndex="1"
         HasSymbols="True"
-        IsInvalid="True"
+        IsInvalid="False"
         MethodInfo="Function"
-        NextStatement="{Exception: StackFrame is not valid anymore}" />
+        NextStatement="FunctionLifetime.cs:23,4-23,18" />
     </Old_StackFrame>
     <SelectedStackFrame>
       <StackFrame
@@ -105,13 +105,13 @@ namespace Debugger.Tests {
     <DebuggingPaused>Break FunctionLifetime.cs:24,4-24,40</DebuggingPaused>
     <Old_StackFrame>
       <StackFrame
-        ArgumentCount="{Exception: StackFrame is not valid anymore}"
+        ArgumentCount="1"
         ChainIndex="1"
         FrameIndex="1"
         HasSymbols="True"
-        IsInvalid="True"
+        IsInvalid="False"
         MethodInfo="Function"
-        NextStatement="{Exception: StackFrame is not valid anymore}" />
+        NextStatement="FunctionLifetime.cs:24,4-24,40" />
     </Old_StackFrame>
     <SelectedStackFrame>
       <StackFrame
@@ -136,13 +136,13 @@ namespace Debugger.Tests {
     </Main>
     <Old_StackFrame>
       <StackFrame
-        ArgumentCount="{Exception: StackFrame is not valid anymore}"
+        ArgumentCount="{Exception: The requested frame index is too big}"
         ChainIndex="1"
         FrameIndex="1"
         HasSymbols="True"
         IsInvalid="True"
         MethodInfo="Function"
-        NextStatement="{Exception: StackFrame is not valid anymore}" />
+        NextStatement="{Exception: The requested frame index is too big}" />
     </Old_StackFrame>
     <SelectedStackFrame>
       <StackFrame