Hello,
cy exec print(localvar)
currently does not work. And I need your help to fix it.
If I'm not mistaken, the function "_fill_locals_dict" in libcython.py is
supposed to find and set all local variables.
The "for name, cyvar in iterator:" correctly iterates over all local
variables, but cyvar.type is not PythonObject but CObject.
The cython line "localvar= 49" gets translated to the C-line
"__pyx_v_localvar = 49;". Notice how the type of__pyx_v_localvar is long
and not a static PyObject* . If an equivalent "static PyObject*" would
exist in the C-code, I would know how to make 'cy exec print(localvar)'
work (the reason why global variables work, is because they are of type
static PyObject*).
I see two ways to make `cy exec print(localvar)` work:
1. Let cygdb generate C-code to convert a long (or any other type) to an
equivalent static PyObject* (For long's it would be
__Pyx_PyInt_From_long). Then let cygdb execute this code by running
gdb.parse_and_eval(code). Then read the resulting variable with
something like
code = '''
(PyObject *) PyDict_SetItem(
(PyObject *) %d,
(PyObject *) %d,
(PyObject *) %s)
''' % (local_dict_pointer, pystringp, cname)
gdb.parse_and_eval(code)
2. Compile the argument of cy exec (in this case "print(localvar)") to
C-code (while getting the local variables right) and run it using
gdb.parse_and_eval(code).
Ideally, cy exec var=123 should work like cy set var=123.
Example to reproduce it:
codefile.pyx:
def func():
localvar = 49
print(localvar)
func()
setup.py:
#!/usr/bin/env python
from setuptools import setup, Extension
from Cython.Build import cythonize
extensions = Extension('codefile', sources=['codefile.pyx'])
setup(
author = 'Volker Weissmann',
author_email = 'volker.weissm...@gmx.de',
ext_modules = cythonize(
extensions,
gdb_debug=True,
),
)
.cygdbinit:
cy break codefile:3
cy run
cy print localvar
To reproduce it, run:
python setup.py build_ext --inplace
cygdb . -- -q --args python -c "import codefile"
With a debug version of Python.
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