private void OnStepTargetBreakpoint(DkmThread thread)
{
if (_stepper == null)
{
Debug.Fail("OnStepTargetBreakpoint called but no step operation is in progress.");
throw new InvalidOperationException();
}
if (_stepper.StepKind == DkmStepKind.Into)
{
StepDone(thread).OnStepArbitration(DkmStepArbitrationReason.ExitRuntime, _process.GetPythonRuntimeInstance());
}
else
{
// Just because we hit the return breakpoint doesn't mean that we've actually returned - it could be
// a recursive call. Check stack depth to distinguish this from an actual return.
var beginState = _stepper.GetDataItem <StepBeginState>();
if (beginState != null)
{
ulong retAddr, frameBase, vframe;
thread.GetCurrentFrameInfo(out retAddr, out frameBase, out vframe);
if (frameBase > beginState.FrameBase)
{
OnStepComplete(thread);
}
}
}
}
void IDkmRuntimeBreakpointReceived.OnRuntimeBreakpointReceived(DkmRuntimeBreakpoint runtimeBreakpoint, DkmThread thread, bool hasException, DkmEventDescriptorS eventDescriptor)
{
if (runtimeBreakpoint.SourceId == Guids.LocalComponentGuid)
{
ulong retAddr, frameBase, vframe;
thread.GetCurrentFrameInfo(out retAddr, out frameBase, out vframe);
new LocalComponent.HandleBreakpointRequest {
BreakpointId = runtimeBreakpoint.UniqueId,
ThreadId = thread.UniqueId,
FrameBase = frameBase,
VFrame = vframe,
ReturnAddress = retAddr
}.SendHigher(thread.Process);
}
else if (runtimeBreakpoint.SourceId == Guids.PythonTraceManagerSourceGuid || runtimeBreakpoint.SourceId == Guids.PythonStepTargetSourceGuid)
{
var traceManager = runtimeBreakpoint.Process.GetDataItem <TraceManager>();
if (traceManager != null)
{
traceManager.OnNativeBreakpointHit(runtimeBreakpoint, thread);
}
}
else
{
Debug.Fail("RemoteComponent received a notification for a breakpoint that it does not know how to handle.");
throw new ArgumentException();
}
}
ulong GetReturnAddress(DkmThread thread)
{
// GetCurrentFrameInfo should provide the return address but the result is actually the current instruction address... so we have to go and lookup stack frame data at [ebp+4]
var frameRegs = thread.GetCurrentRegisters(new DkmUnwoundRegister[0]);
ulong address = 0;
var x86Regs = frameRegs as DkmX86FrameRegisters;
if (x86Regs != null)
{
byte[] ebpData = new byte[4];
if (x86Regs.GetRegisterValue(22, ebpData) == 4)
{
address = DebugHelpers.ReadPointerVariable(thread.Process, BitConverter.ToUInt32(ebpData, 0) + 4).GetValueOrDefault(0);
}
}
if (address == 0)
{
thread.GetCurrentFrameInfo(out address, out _, out _);
}
return(address);
}
