void UpdateFrames_DbgThread()
{
dbgManager.Dispatcher.VerifyAccess();
bool raiseActiveFrameIndexChanged, raiseFramesChanged;
DbgStackWalker stackWalker = null;
DbgStackFrame[] newFrames = null;
try {
var thread = dbgManager.CurrentThread.Current;
if (thread == null || thread.Process.State != DbgProcessState.Paused)
{
newFrames = Array.Empty <DbgStackFrame>();
}
else
{
stackWalker = thread.CreateStackWalker();
newFrames = stackWalker.GetNextStackFrames(MaxShownFrames + 1);
}
lock (lockObj) {
if (frames.Length > 0)
{
dbgManager.Close(frames);
}
int newActiveFrameIndex = GetFrameIndex(newFrames);
// Always raise frames-changed event even if old and new arrays have 0 length.
raiseFramesChanged = true;
raiseActiveFrameIndexChanged = newActiveFrameIndex != activeFrameIndex;
// Note that we keep the extra frame so we don't have to create a new array with one less
// frame. If we got MaxShownFrames+1 frames, it's not very likely that the last one in the
// array is actually the last frame.
// Another solution is to create a custom IList<DbgStackFrame> that hides the last one
// but that's not worth it.
frames = newFrames;
readOnlyFrames = newFrames.Length == 0 ? emptyFrames : new ReadOnlyCollection <DbgStackFrame>(newFrames);
activeFrameIndex = newActiveFrameIndex;
framesTruncated = newFrames.Length > MaxShownFrames;
}
}
finally {
stackWalker?.Close();
if (newFrames != null && frames != newFrames && newFrames.Length > 0)
{
dbgManager.Close(newFrames);
}
}
if (raiseFramesChanged || raiseActiveFrameIndexChanged)
{
FramesChanged?.Invoke(this, new FramesChangedEventArgs(raiseFramesChanged, raiseActiveFrameIndexChanged));
}
}
/// <summary>
/// Gets the top stack frame or null if there's none
/// </summary>
/// <returns></returns>
public DbgStackFrame GetTopStackFrame()
{
DbgStackWalker stackWalker = null;
try {
stackWalker = CreateStackWalker();
var frames = stackWalker.GetNextStackFrames(1);
Debug.Assert(frames.Length <= 1);
return(frames.Length == 0 ? null : frames[0]);
}
finally {
stackWalker?.Close();
}
}
/// <summary>
/// Gets the first <paramref name="count"/> frames.
/// The returned frame count can be less than <paramref name="count"/> if there's not enough frames available.
/// </summary>
/// <param name="count">Max number of frames to return</param>
/// <returns></returns>
public DbgStackFrame[] GetFrames(int count)
{
if (count < 0)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
if (count == 0)
{
return(Array.Empty <DbgStackFrame>());
}
DbgStackWalker stackWalker = null;
try {
stackWalker = CreateStackWalker();
var frames = stackWalker.GetNextStackFrames(count);
Debug.Assert(frames.Length <= count);
return(frames);
}
finally {
stackWalker?.Close();
}
}
/// <summary>
/// Gets the first non-null frame location. This location must be <see cref="DbgCodeLocation.Close"/>'d
/// by the caller.
/// </summary>
/// <param name="thread">Thread</param>
/// <returns></returns>
public static (DbgCodeLocation location, int frameIndex) GetFirstFrameLocation(DbgThread thread)
{
DbgStackWalker stackWalker = null;
var objsToFree = new List <DbgObject>();
try {
stackWalker = thread.CreateStackWalker();
objsToFree.Add(stackWalker);
int frameIndex = 0;
while (frameIndex < 20)
{
// Usually the first frame contains a location and if not, the one after that.
var frames = stackWalker.GetNextStackFrames(2);
objsToFree.AddRange(frames);
if (frames.Length == 0)
{
break;
}
foreach (var frame in frames)
{
var location = frame.Location;
if (location != null)
{
return(location.Clone(), frameIndex);
}
frameIndex++;
}
}
}
finally {
if (objsToFree.Count > 0)
{
thread.Process.DbgManager.Close(objsToFree);
}
}
return(null, -1);
}
