[lldb-dev] Python example does not work with latest LLDBs

[Greg Clayton via lldb-dev]

I would be probably best to just step through it and see why it is incorrectly returning. We know it is broken. We should also add a test for this so we don't regress again.

Greg

> On Feb 13, 2017, at 10:19 AM, Roman Popov <ripopov at gmail.com> wrote:
> 
> Yes Greg, this was my expectation that it should not return until stops on break-point. But I had to downgrade sequentially from 5.0 to 4.0 to 3.9 to make it work as expected.
> 
> Can I get some diagnostics? Any log files? 
> 
> 2017-02-13 20:11 GMT+03:00 Greg Clayton <gclayton at apple.com <mailto:gclayton at apple.com>>:
> The example code is:
> 
> #!/usr/bin/python
> 
> import lldb
> import os
> 
> def disassemble_instructions(insts):
>     for i in insts:
>         print i
> 
> # Set the path to the executable to debug
> exe = "./a.out"
> 
> # Create a new debugger instance
> debugger = lldb.SBDebugger.Create()
> 
> # When we step or continue, don't return from the function until the process 
> # stops. Otherwise we would have to handle the process events ourselves which, while doable is
> #a little tricky.  We do this by setting the async mode to false.
> debugger.SetAsync (False)
> 
> # Create a target from a file and arch
> print "Creating a target for '%s'" % exe
> 
> target = debugger.CreateTargetWithFileAndArch (exe, lldb.LLDB_ARCH_DEFAULT)
> 
> if target:
>     # If the target is valid set a breakpoint at main
>     main_bp = target.BreakpointCreateByName ("main", target.GetExecutable().GetFilename());
> 
>     print main_bp
> 
>     # Launch the process. Since we specified synchronous mode, we won't return
>     # from this function until we hit the breakpoint at main
>     process = target.LaunchSimple (None, None, os.getcwd())
>     
>     # Make sure the launch went ok
>     if process:
>         # Print some simple process info
>         state = process.GetState ()
>         print process
>         if state == lldb.eStateStopped:
>             # Get the first thread
>             thread = process.GetThreadAtIndex (0)
>             if thread:
>                 # Print some simple thread info
>                 print thread
>                 # Get the first frame
>                 frame = thread.GetFrameAtIndex (0)
>                 if frame:
>                     # Print some simple frame info
>                     print frame
>                     function = frame.GetFunction()
>                     # See if we have debug info (a function)
>                     if function:
>                         # We do have a function, print some info for the function
>                         print function
>                         # Now get all instructions for this function and print them
>                         insts = function.GetInstructions(target)
>                         disassemble_instructions (insts)
>                     else:
>                         # See if we have a symbol in the symbol table for where we stopped
>                         symbol = frame.GetSymbol();
>                         if symbol:
>                             # We do have a symbol, print some info for the symbol
>                             print symbol
> 
> We set the async mode to false, so target.LaunchSimple() should not return until the process is stopped or exited. Note in your example it is returning with "state = launching", so this is what is failing. For some reason synchronous mode is not being obeyed.
> 
> Greg
> 
>> On Feb 11, 2017, at 10:07 AM, Roman Popov via lldb-dev <lldb-dev at lists.llvm.org <mailto:lldb-dev at lists.llvm.org>> wrote:
>> 
>> I'm testing example from https://lldb.llvm.org/python-reference.html <https://lldb.llvm.org/python-reference.html> (USING THE LLDB.PY MODULE IN PYTHON)  on Ubuntu 16.04
>> 
>> For some reason it works only with LLDB 3.9, is it because LLDB 4.0/5.0 are not stable yet?
>> 
>> #5.0   -- Does not work
>> deb http://apt.llvm.org/xenial/ <http://apt.llvm.org/xenial/> llvm-toolchain-xenial main
>> # 3.9  -- Works
>> deb http://apt.llvm.org/xenial/ <http://apt.llvm.org/xenial/> llvm-toolchain-xenial-3.9 main
>> # 4.0  -- Does not work
>> deb http://apt.llvm.org/xenial/ <http://apt.llvm.org/xenial/> llvm-toolchain-xenial-4.0 main
>> 
>> >clang-5.0 -g test.cpp
>> >./python_example.py
>> Creating a target for './a.out'
>> SBBreakpoint: id = 1, name = 'main', locations = 1
>> SBProcess: pid = 0, state = launching, threads = 0, executable = a.out
>> Thanks,
>> Roman
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> 
> 

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