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#!/usr/bin/env python
"""
The Cython debugger
The current directory should contain a directory named 'cython_debug', or a
path to the cython project directory should be given (the parent directory of
cython_debug).
Additional gdb args can be provided only if a path to the project directory is
given.
"""
import os
import sys
import glob
import tempfile
import textwrap
import subprocess
usage = "Usage: cygdb [PATH [GDB_ARGUMENTS]]"
def make_command_file(path_to_debug_info, prefix_code='', no_import=False):
if not no_import:
pattern = os.path.join(path_to_debug_info,
'cython_debug',
'cython_debug_info_*')
debug_files = glob.glob(pattern)
if not debug_files:
sys.exit('%s.\nNo debug files were found in %s. Aborting.' % (
usage, os.path.abspath(path_to_debug_info)))
fd, tempfilename = tempfile.mkstemp()
f = os.fdopen(fd, 'w')
f.write(prefix_code)
f.write('set breakpoint pending on\n')
f.write("set print pretty on\n")
f.write('python from Cython.Debugger import libcython, libpython\n')
if no_import:
# don't do this, this overrides file command in .gdbinit
# f.write("file %s\n" % sys.executable)
pass
else:
path = os.path.join(path_to_debug_info, "cython_debug", "interpreter")
interpreter = open(path).read()
f.write("file %s\n" % interpreter)
f.write('\n'.join('cy import %s\n' % fn for fn in debug_files))
f.write(textwrap.dedent('''\
python
import sys
try:
gdb.lookup_type('PyModuleObject')
except RuntimeError:
sys.stderr.write(
'Python was not compiled with debug symbols (or it was '
'stripped). Some functionality may not work (properly).\\n')
end
'''))
f.close()
return tempfilename
def main(path_to_debug_info=None, gdb_argv=None, no_import=False):
"""
Start the Cython debugger. This tells gdb to import the Cython and Python
extensions (libcython.py and libpython.py) and it enables gdb's pending
breakpoints.
path_to_debug_info is the path to the Cython build directory
gdb_argv is the list of options to gdb
no_import tells cygdb whether it should import debug information
"""
if path_to_debug_info is None:
if len(sys.argv) > 1:
path_to_debug_info = sys.argv[1]
else:
path_to_debug_info = os.curdir
if gdb_argv is None:
gdb_argv = sys.argv[2:]
if path_to_debug_info == '--':
no_import = True
tempfilename = make_command_file(path_to_debug_info, no_import=no_import)
p = subprocess.Popen(['gdb', '-command', tempfilename] + gdb_argv)
while True:
try:
p.wait()
except KeyboardInterrupt:
pass
else:
break
os.remove(tempfilename)