[Ironpython-users] WDB web debugger for IronPython

[Jeff Hardy]

On Tue, Nov 25, 2014 at 12:32 PM, Kerray <kerray.cz at gmail.com> wrote:

> Hi,
> very good point, I've been on beta3. But the upgrade didn't help. I've
> figured out how to debug the internals in VS, but there's nothing I could
> be able to fix (or even understand) myself at this point.
>
> ad 1) after running wdb.server, Tornado at first says
> \tornado\netutil.py", line 88, in bind_sockets
> AttributeError: 'module' object has no attribute 'IPV6_V6ONLY'
> When I comment the whole if section out, it starts the loop and waits for
> connections.
>

Can you open an issue for this? Should be straightforward, if .NET supports
IPv6 only connections. Might have to wait to 2.7.6 though. In the meantime
you can add `hasatter(socket, 'IPV6_V6ONLY')` to the if.


>
> Running the client, the server reports this and continues listening:
> Connection received from ('127.0.0.1', 1518)
> [E 141125 11:51:35 stack_context:1] Exception in I/O handler for fd 1616
>     Traceback (most recent call last):
>       File "-\tornado\stack_context.py", line 304, in wrapped
>         ret = fn(*args, **kwargs)
>       File "-\tornado\netutil.py", line 154, in accept_handler
>         callback(connection, address)
>       File "-\wdb_server\streams.py", line 95, in handle_connection
>         stream.read_bytes(4, partial(read_uuid_size, stream))
>       File "-\tornado\iostream.py", line 168, in read_bytes
>         self._try_inline_read()
>       File "-\tornado\iostream.py", line 424, in _try_inline_read
>         if self._read_to_buffer() == 0:
>       File "-\tornado\iostream.py", line 447, in _read_to_buffer
>         chunk = self.read_from_fd()
>       File "-\tornado\iostream.py", line 686, in read_from_fd
>         chunk = self.socket.recv(self.read_chunk_size)
>     error: [Errno 10022] A request to send or receive data was disallowed
> because the socket is not connected and (when sending on a datagram socket
> using a sendto call) no address was supplied
>
> And the client crashes with
> wdb\client\wdb\_compat.py", line 165, in send_bytes
> socket.error: [Errno 10053] An established connection was aborted by the
> software in your host machine
>
> When trying to debug this in VS, I came to the conclusion that the Tornado
> server's socket handling (or my commenting out a piece, or something else
> inside Tornado running under IronPython-) is at fault, since it's not true
> what I've written previously (that a message gets communicated and then
> coms fail) - in fact nothing gets communicated, it crashes in the client on
> trying to send the first message using socket.cs sendallWorker(byte[]
> buffer, int flags).
>

Not sure why it would not be connected, but I presume Tornado tries to
configure the sockets as non-blocking; it's possible that gets IronPython
confused.


>
>
> ad 2) running the server in Python and client in IronPython, I get a bit
> further, but the error is the same - the client in IronPython reports
> Launching browser and wait for connection
> Exception Traceback (most recent call last):
>   File "-\wdb\client\wdb\__init__.py", line 291, in trace_debug_dispatch
>   File "-\wdb\client\wdb\__init__.py", line 250, in trace_dispatch
>   File "-\wdb\client\wdb\__init__.py", line 686, in handle_call
>   File "-\wdb\client\wdb\__init__.py", line 660, in interaction
>   File "-\wdb\client\wdb\ui.py", line 80, in __init__
>   File "-\wdb\client\wdb\__init__.py", line 575, in get_trace
> TypeError: Unable to cast object of type
> 'System.Linq.Expressions.FieldExpression' to type
> 'System.Linq.Expressions.BlockExpression'.
>
> It's the same place and line of code I mentioned in my previous mail:
> > startlnos = dis.findlinestarts(code)
>
> Debugging in VS yields an impressive stack trace, but I don't have any
> idea where to start with this, so again - I'll be very grateful for any
> pointers.
>

Looks like one of the generator rewriters has a bug. I can't come up with a
simple case to reproduce this, though. It's failing when switching from
interpreted to compiled (LambdaExpression.Compile) but I'm not sure how to
trip that right now, for if it's specific to the code it's compiling.

- Jeff


> Thanks - for even reading this far.
>
>
>    at
> Microsoft.Scripting.Ast.GeneratorRewriter.VisitAssign(BinaryExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 831
>    at
> Microsoft.Scripting.Ast.GeneratorRewriter.VisitBinary(BinaryExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 876
>    at System.Linq.Expressions.BinaryExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitTry(TryExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 297
>    at System.Linq.Expressions.TryExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at
> Microsoft.Scripting.Ast.GeneratorRewriter.VisitAssign(BinaryExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 789
>    at
> Microsoft.Scripting.Ast.GeneratorRewriter.VisitBinary(BinaryExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 876
>    at System.Linq.Expressions.BinaryExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(ReadOnlyCollection`1
> nodes)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.VisitBlock(BlockExpression
> node) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 595
>    at System.Linq.Expressions.BlockExpression.Accept(ExpressionVisitor
> visitor)
>    at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
>    at Microsoft.Scripting.Ast.GeneratorRewriter.Reduce() in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorRewriter.cs:line
> 100
>    at Microsoft.Scripting.Ast.GeneratorExpression.Reduce() in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Ast\GeneratorExpression.cs:line
> 94
>    at System.Linq.Expressions.Expression.ReduceAndCheck()
>    at System.Linq.Expressions.Expression.ReduceExtensions()
>    at
> System.Linq.Expressions.Compiler.StackSpiller.RewriteExtensionExpression(Expression
> expr, Stack stack)
>    at
> System.Linq.Expressions.Compiler.StackSpiller.RewriteExpression(Expression
> node, Stack stack)
>    at
> System.Linq.Expressions.Compiler.StackSpiller.RewriteExpressionFreeTemps(Expression
> expression, Stack stack)
>    at
> System.Linq.Expressions.Compiler.StackSpiller.Rewrite[T](Expression`1
> lambda)
>    at System.Linq.Expressions.Expression`1.Accept(StackSpiller spiller)
>    at
> System.Linq.Expressions.Compiler.LambdaCompiler.Compile(LambdaExpression
> lambda, DebugInfoGenerator debugInfoGenerator)
>    at System.Linq.Expressions.LambdaExpression.Compile()
>    at
> Microsoft.Scripting.Debugging.DebuggableLambdaBuilder.CreateFunctionInfo(LambdaExpression
> generatorFactoryLambda) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Debugging\DebuggableLambdaBuilder.cs:line
> 386
>    at
> Microsoft.Scripting.Debugging.DebuggableLambdaBuilder.TransformLambda(LambdaExpression
> lambda) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Debugging\DebuggableLambdaBuilder.cs:line
> 171
>    at
> Microsoft.Scripting.Debugging.DebuggableLambdaBuilder.Transform(LambdaExpression
> lambda) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Debugging\DebuggableLambdaBuilder.cs:line
> 111
>    at
> Microsoft.Scripting.Debugging.CompilerServices.DebugContext.TransformLambda(LambdaExpression
> lambda, DebugLambdaInfo lambdaInfo) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Debugging\DebugContext.cs:line
> 68
>    at
> IronPython.Runtime.FunctionCode.<>c__DisplayClass1a.<GetGeneratorOrNormalLambdaTracing>b__19(Expression`1
> x) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Runtime\FunctionCode.cs:line
> 787
>    at IronPython.Compiler.GeneratorRewriter.Reduce(Boolean
> shouldInterpret, Boolean emitDebugSymbols, Int32 compilationThreshold,
> IList`1 parameters, Func`2 bodyConverter) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Compiler\GeneratorRewriter.cs:line
> 147
>    at
> IronPython.Runtime.FunctionCode.GetGeneratorOrNormalLambdaTracing(PythonContext
> context) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Runtime\FunctionCode.cs:line
> 777
>    at IronPython.Runtime.FunctionCode.UpdateDelegate(PythonContext
> context, Boolean forceCreation) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Runtime\FunctionCode.cs:line
> 717
>    at
> IronPython.Runtime.FunctionCode.LazyCompileFirstTarget(PythonFunction
> function) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Runtime\FunctionCode.cs:line
> 697
>    at
> IronPython.Compiler.PythonCallTargets.OriginalCallTarget1(PythonFunction
> function, Object arg0) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Compiler\PythonCallTargets.cs:line
> 42
>    at IronPython.Runtime.FunctionCaller`1.Call1(CallSite site, CodeContext
> context, Object func, T0 arg0) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Runtime\PythonFunction.Generated.cs:line
> 420
>    at
> System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite
> site, T0 arg0, T1 arg1, T2 arg2)
>    at get_trace$495(Closure , PythonFunction , Object , Object , Object )
>    at
> IronPython.Compiler.PythonFunctionRecursionCheck3.CallTarget(PythonFunction
> function, Object arg0, Object arg1, Object arg2) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Compiler\PythonCallTargets.cs:line
> 273
>    at
> IronPython.Compiler.PythonCallTargets.OriginalCallTarget3(PythonFunction
> function, Object arg0, Object arg1, Object arg2) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Compiler\PythonCallTargets.cs:line
> 53
>    at IronPython.Runtime.FunctionCaller`3.Call3(CallSite site, CodeContext
> context, Object func, T0 arg0, T1 arg1, T2 arg2) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Runtime\PythonFunction.Generated.cs:line
> 676
>    at
> System.Dynamic.UpdateDelegates.UpdateAndExecute5[T0,T1,T2,T3,T4,TRet](CallSite
> site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
>    at CallSite.Target(Closure , CallSite , CodeContext , Object , Object ,
> Object , Object )
>    at IronPython.Runtime.Method.MethodBinding`2.SelfTarget(CallSite site,
> CodeContext context, Object target, T0 arg0, T1 arg1) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Runtime\Method.Generated.cs:line
> 195
>    at
> System.Dynamic.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite
> site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
>    at
> Microsoft.Scripting.Interpreter.DynamicInstruction`5.Run(InterpretedFrame
> frame) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Interpreter\Instructions\DynamicInstructions.Generated.cs:line
> 218
>    at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame
> frame) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Interpreter\Interpreter.cs:line
> 132
>    at
> Microsoft.Scripting.Interpreter.LightLambda.Run10[T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,TRet](T0
> arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8
> arg8, T9 arg9) in
> c:\Users\jmatysek\Documents\main\Runtime\Microsoft.Dynamic\Interpreter\LightLambda.Generated.cs:line
> 417
>    at
> IronPython.Compiler.PythonFunctionRecursionCheck9.CallTarget(PythonFunction
> function, Object arg0, Object arg1, Object arg2, Object arg3, Object arg4,
> Object arg5, Object arg6, Object arg7, Object arg8) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Compiler\PythonCallTargets.cs:line
> 375
>    at
> IronPython.Compiler.PythonCallTargets.OriginalCallTarget9(PythonFunction
> function, Object arg0, Object arg1, Object arg2, Object arg3, Object arg4,
> Object arg5, Object arg6, Object arg7, Object arg8) in
> c:\Users\jmatysek\Documents\main\Languages\IronPython\IronPython\Compiler\PythonCallTargets.cs:line
> 83
>
>
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