private int Continue(IDebugThread2 pThread)
{
ThrowIfDisposed();
if (_firstContinue)
{
_firstContinue = false;
}
else
{
// If _sentContinue is true, then this is a dummy Continue issued to notify the
// debugger that user has explicitly entered something at the Browse prompt, and
// we don't actually need to issue the command to R debugger.
Func <CancellationToken, Task> continueMethod = null;
lock (_browseLock) {
if (_sentContinue != true)
{
_sentContinue = true;
continueMethod = ct => DebugSession.ContinueAsync(ct);
}
}
if (continueMethod != null)
{
TaskExtensions.RunSynchronouslyOnUIThread(continueMethod);
}
}
return(VSConstants.S_OK);
}
internal DebugStackFrame(DebugSession session, int index, DebugStackFrame callingFrame, JObject jFrame, DebugStackFrame fallbackFrame = null)
{
Session = session;
Index = index;
CallingFrame = callingFrame;
FileName = jFrame.Value <string>("filename");
LineNumber = jFrame.Value <int?>("line_number");
Call = jFrame.Value <string>("call");
IsGlobal = jFrame.Value <bool?>("is_global") ?? false;
var match = _doTraceRegex.Match(Call);
if (match.Success)
{
FrameKind = DebugStackFrameKind.DoTrace;
}
if (fallbackFrame != null)
{
// If we still don't have the filename and line number, use those from the fallback frame.
// This happens during breakpoint hit processing after the context is unwound from within
// .doTrace back to the function that called it - because we no longer have .doTrace call,
// we don't have the file/line information that came from it. But DebugSession will have
// stashed it away when it had it, and then pass it as a fallback frame if index matches.
FileName = FileName ?? fallbackFrame.FileName;
LineNumber = LineNumber ?? fallbackFrame.LineNumber;
}
}
int IDebugEngine2.CauseBreak()
{
ThrowIfDisposed();
DebugSession.BreakAsync()
.SilenceException <MessageTransportException>()
.DoNotWait();
return(VSConstants.S_OK);
}
int IDebugEngine2.Attach(IDebugProgram2[] rgpPrograms, IDebugProgramNode2[] rgpProgramNodes, uint celtPrograms, IDebugEventCallback2 pCallback, enum_ATTACH_REASON dwReason)
{
ThrowIfDisposed();
if (rgpPrograms.Length != 1)
{
throw new ArgumentException("Zero or more than one programs", "rgpPrograms");
}
_program = rgpPrograms[0] as RDebugPortSupplier.DebugProgram;
if (_program == null)
{
throw new ArgumentException("rgpPrograms[0] must be an " + nameof(RDebugPortSupplier.DebugProgram), "rgpPrograms");
}
Marshal.ThrowExceptionForHR(_program.GetProgramId(out _programId));
_events = pCallback;
DebugSession = TaskExtensions.RunSynchronouslyOnUIThread(ct => _program.Session.TraceExecutionAsync(ct));
MainThread = new AD7Thread(this);
IsConnected = true;
// Enable breakpoint instrumentation.
TaskExtensions.RunSynchronouslyOnUIThread(ct => DebugSession.EnableBreakpointsAsync(true, ct));
// Send notification after acquiring the session - we need it in case there were any breakpoints pending before
// the attach, in which case we'll immediately get breakpoint creation requests as soon as we send these, and
// we will need the session to process them.
AD7EngineCreateEvent.Send(this);
AD7ProgramCreateEvent.Send(this);
Send(new AD7LoadCompleteEvent(), AD7LoadCompleteEvent.IID);
// Register event handlers after notifying VS that debug engine has loaded. This order is important because
// we may get a Browse event immediately, and we want to raise a breakpoint notification in response to that
// to pause the debugger - but it will be ignored unless the engine has reported its creation.
// Also, AfterRequest must be registered before Browse, so that we never get in a situation where we get
// Browse but not AfterRequest that follows it because of a race between raising and registration.
DebugSession.Session.AfterRequest += RSession_AfterRequest;
DebugSession.Session.Disconnected += RSession_Disconnected;
// If we're already at the Browse prompt, registering the handler will result in its immediate invocation.
// We want to handle that fully before we process any following AfterRequest event to avoid concurrency issues
// where we pause and never resume, so hold the lock while adding the handler.
lock (_browseLock) {
DebugSession.Browse += Session_Browse;
}
return(VSConstants.S_OK);
}
int IDebugProgram2.Step(IDebugThread2 pThread, enum_STEPKIND sk, enum_STEPUNIT Step)
{
ThrowIfDisposed();
Task <bool> step;
switch (sk)
{
case enum_STEPKIND.STEP_OVER:
step = DebugSession.StepOverAsync();
break;
case enum_STEPKIND.STEP_INTO:
step = DebugSession.StepIntoAsync();
break;
case enum_STEPKIND.STEP_OUT:
goto default;
// step = DebugSession.StepOutAsync();
// break;
default:
return(VSConstants.E_NOTIMPL);
}
step.ContinueWith(t => {
// If step was interrupted midway (e.g. by a breakpoint), we have already reported breakpoint
// hit event, and so we must not report step complete. Note that interrupting is not the same
// as canceling, and if step was canceled, we must report step completion.
bool completed = true;
try {
completed = t.GetAwaiter().GetResult();
} catch (OperationCanceledException) {
} catch (MessageTransportException) {
}
if (completed)
{
Send(new AD7SteppingCompleteEvent(), AD7SteppingCompleteEvent.IID);
}
});
return(VSConstants.S_OK);
}
int IDebugProgram2.Detach()
{
ThrowIfDisposed();
try {
// Queue disabling breakpoint instrumentation, but do not wait for it to complete -
// if there's currently some code running, this may take a while, so just detach and
// let breakpoints be taken care of later.
DebugSession.EnableBreakpointsAsync(false)
.SilenceException <MessageTransportException>()
.DoNotWait();
} finally {
// Detach should never fail, even if something above didn't work.
DestroyProgram();
}
return(VSConstants.S_OK);
}
internal DebugBreakpoint(DebugSession session, DebugBreakpointLocation location)
{
Session = session;
Location = location;
}
int IDebugProgram3.ExecuteOnThread(IDebugThread2 pThread)
{
ThrowIfDisposed();
DebugSession.CancelStep();
return(Continue(pThread));
}