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Issue #13628: python-gdb.py is now able to retrieve more frames in the Python

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traceback if Python is optimized.

 * delay the lookup of the size_t type, it is not available at startup
 * The second argument of the PyFrameObjectPtr constructor is optional, as
   done in other constructors
 * iter_builtins() and iter_globals() methods of PyFrameObjectPtr returns
   an empty tuple instead of None if Python is optimized
 * Fix py-bt and py-bt-full to handle correctly "optimized" frames
 * Frame.get_pyop() tries to get the frame pointer from PyEval_EvalCodeEx()
   if the pointer is optimized out in PyEval_EvalFrameEx()
This commit is contained in:
Victor Stinner 2011-12-19 13:42:24 +01:00
parent 78ed83da46
commit d208416a40
3 changed files with 58 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

22
Lib/test/test_gdb.py
View file

@ -529,6 +529,8 @@ id(foo.__code__)''',
re.DOTALL),
'Unexpected gdb representation: %r\n%s' % (gdb_output, gdb_output))
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
class PyListTests(DebuggerTests):
def assertListing(self, expected, actual):
self.assertEndsWith(actual, expected)
@ -571,6 +573,8 @@ class PyListTests(DebuggerTests):
class StackNavigationTests(DebuggerTests):
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_pyup_command(self):
'Verify that the "py-up" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
@ -598,6 +602,8 @@ $''')
'Unable to find an older python frame\n')
@unittest.skipUnless(HAS_PYUP_PYDOWN, "test requires py-up/py-down commands")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_up_then_down(self):
'Verify "py-up" followed by "py-down"'
bt = self.get_stack_trace(script=self.get_sample_script(),
@ -611,6 +617,8 @@ $''')
$''')
class PyBtTests(DebuggerTests):
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_bt(self):
'Verify that the "py-bt" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
@ -628,6 +636,8 @@ Traceback \(most recent call first\):
foo\(1, 2, 3\)
''')
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_bt_full(self):
'Verify that the "py-bt-full" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
@ -639,10 +649,12 @@ Traceback \(most recent call first\):
#[0-9]+ Frame 0x[0-9a-f]+, for file .*gdb_sample.py, line 4, in foo \(a=1, b=2, c=3\)
bar\(a, b, c\)
#[0-9]+ Frame 0x[0-9a-f]+, for file .*gdb_sample.py, line 12, in <module> \(\)
foo\(1, 2, 3\)
foo\(1, 2, 3\)
''')
class PyPrintTests(DebuggerTests):
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_basic_command(self):
'Verify that the "py-print" command works'
bt = self.get_stack_trace(script=self.get_sample_script(),
@ -657,12 +669,16 @@ class PyPrintTests(DebuggerTests):
self.assertMultilineMatches(bt,
r".*\nlocal 'c' = 3\nlocal 'b' = 2\nlocal 'a' = 1\n.*")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_printing_global(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-print __name__'])
self.assertMultilineMatches(bt,
r".*\nglobal '__name__' = '__main__'\n.*")
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_printing_builtin(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-print len'])
@ -670,6 +686,8 @@ class PyPrintTests(DebuggerTests):
r".*\nbuiltin 'len' = <built-in method len of module object at remote 0x[0-9a-f]+>\n.*")
class PyLocalsTests(DebuggerTests):
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_basic_command(self):
bt = self.get_stack_trace(script=self.get_sample_script(),
cmds_after_breakpoint=['py-locals'])
@ -684,8 +702,6 @@ class PyLocalsTests(DebuggerTests):
r".*\na = 1\nb = 2\nc = 3\n.*")
def test_main():
if python_is_optimized():
raise unittest.SkipTest("Python was compiled with optimizations")
run_unittest(PrettyPrintTests,
PyListTests,
StackNavigationTests,

6
Misc/NEWS
View file

@ -314,6 +314,12 @@ Build
- Issue #13326: Clean __pycache__ directories correctly on OpenBSD.
Tools/Demos
-----------
- Issue #13628: python-gdb.py is now able to retrieve more frames in the Python
traceback if Python is optimized.
Tests
-----

35
Tools/gdb/libpython.py
View file

@ -49,7 +49,6 @@ import sys
_type_char_ptr = gdb.lookup_type('char').pointer() # char*
_type_unsigned_char_ptr = gdb.lookup_type('unsigned char').pointer() # unsigned char*
_type_void_ptr = gdb.lookup_type('void').pointer() # void*
_type_size_t = gdb.lookup_type('size_t')
SIZEOF_VOID_P = _type_void_ptr.sizeof
@ -435,11 +434,15 @@ class InstanceProxy(object):
self.address)
def _PyObject_VAR_SIZE(typeobj, nitems):
if _PyObject_VAR_SIZE._type_size_t is None:
_PyObject_VAR_SIZE._type_size_t = gdb.lookup_type('size_t')
return ( ( typeobj.field('tp_basicsize') +
nitems * typeobj.field('tp_itemsize') +
(SIZEOF_VOID_P - 1)
) & ~(SIZEOF_VOID_P - 1)
).cast(_type_size_t)
).cast(_PyObject_VAR_SIZE._type_size_t)
_PyObject_VAR_SIZE._type_size_t = None
class HeapTypeObjectPtr(PyObjectPtr):
_typename = 'PyObject'
@ -806,7 +809,7 @@ class PyNoneStructPtr(PyObjectPtr):
class PyFrameObjectPtr(PyObjectPtr):
_typename = 'PyFrameObject'
def __init__(self, gdbval, cast_to):
def __init__(self, gdbval, cast_to=None):
PyObjectPtr.__init__(self, gdbval, cast_to)
if not self.is_optimized_out():
@ -840,7 +843,7 @@ class PyFrameObjectPtr(PyObjectPtr):
the global variables of this frame
'''
if self.is_optimized_out():
return
return ()
pyop_globals = self.pyop_field('f_globals')
return pyop_globals.iteritems()
@ -851,7 +854,7 @@ class PyFrameObjectPtr(PyObjectPtr):
the builtin variables
'''
if self.is_optimized_out():
return
return ()
pyop_builtins = self.pyop_field('f_builtins')
return pyop_builtins.iteritems()
@ -938,6 +941,7 @@ class PyFrameObjectPtr(PyObjectPtr):
def print_traceback(self):
if self.is_optimized_out():
sys.stdout.write(' (frame information optimized out)\n')
return
visited = set()
sys.stdout.write(' File "%s", line %i, in %s\n'
% (self.co_filename.proxyval(visited),
@ -1403,7 +1407,20 @@ class Frame(object):
def get_pyop(self):
try:
f = self._gdbframe.read_var('f')
return PyFrameObjectPtr.from_pyobject_ptr(f)
frame = PyFrameObjectPtr.from_pyobject_ptr(f)
if not frame.is_optimized_out():
return frame
# gdb is unable to get the "f" argument of PyEval_EvalFrameEx()
# because it was "optimized out". Try to get "f" from the frame
# of the caller, PyEval_EvalCodeEx().
orig_frame = frame
caller = self._gdbframe.older()
if caller:
f = caller.read_var('f')
frame = PyFrameObjectPtr.from_pyobject_ptr(f)
if not frame.is_optimized_out():
return frame
return orig_frame
except ValueError:
return None
@ -1434,9 +1451,10 @@ class Frame(object):
if pyop:
line = pyop.get_truncated_repr(MAX_OUTPUT_LEN)
write_unicode(sys.stdout, '#%i %s\n' % (self.get_index(), line))
if not pyop.is_optimized_out():
line = pyop.current_line()
if line is not None:
sys.stdout.write(line)
sys.stdout.write(' %s\n' % line.strip())
else:
sys.stdout.write('#%i (unable to read python frame information)\n' % self.get_index())
else:
@ -1447,6 +1465,7 @@ class Frame(object):
pyop = self.get_pyop()
if pyop:
pyop.print_traceback()
if not pyop.is_optimized_out():
line = pyop.current_line()
if line is not None:
sys.stdout.write(' %s\n' % line.strip())
@ -1495,7 +1514,7 @@ class PyList(gdb.Command):
return
pyop = frame.get_pyop()
if not pyop:
if not pyop or pyop.is_optimized_out():
print 'Unable to read information on python frame'
return