import textwrap
import unittest
from test import support
from test.support import python_is_optimized
from .util import setup_module, DebuggerTests, CET_PROTECTION, SAMPLE_SCRIPT
def setUpModule():
setup_module()
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=SAMPLE_SCRIPT,
cmds_after_breakpoint=['py-bt'])
self.assertMultilineMatches(bt,
r'''^.*
Traceback \(most recent call first\):
<built-in method id of module object .*>
File ".*gdb_sample.py", line 10, in baz
id\(42\)
File ".*gdb_sample.py", line 7, in bar
baz\(a, b, c\)
File ".*gdb_sample.py", line 4, in foo
bar\(a=a, b=b, c=c\)
File ".*gdb_sample.py", line 12, in <module>
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=SAMPLE_SCRIPT,
cmds_after_breakpoint=['py-bt-full'])
self.assertMultilineMatches(bt,
r'''^.*
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 7, in bar \(a=1, b=2, c=3\)
baz\(a, b, c\)
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 4, in foo \(a=1, b=2, c=3\)
bar\(a=a, b=b, c=c\)
#[0-9]+ Frame 0x-?[0-9a-f]+, for file .*gdb_sample.py, line 12, in <module> \(\)
foo\(1, 2, 3\)
''')
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
@support.requires_gil_enabled()
@support.requires_resource('cpu')
def test_threads(self):
'Verify that "py-bt" indicates threads that are waiting for the GIL'
cmd = '''
from threading import Thread
class TestThread(Thread):
# These threads would run forever, but we'll interrupt things with the
# debugger
def run(self):
i = 0
while 1:
i += 1
t = {}
for i in range(4):
t[i] = TestThread()
t[i].start()
# Trigger a breakpoint on the main thread
id(42)
'''
# Verify with "py-bt":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['thread apply all py-bt'])
self.assertIn('Waiting for the GIL', gdb_output)
# Verify with "py-bt-full":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['thread apply all py-bt-full'])
self.assertIn('Waiting for the GIL', gdb_output)
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
# Some older versions of gdb will fail with
# "Cannot find new threads: generic error"
# unless we add LD_PRELOAD=PATH-TO-libpthread.so.1 as a workaround
def test_gc(self):
'Verify that "py-bt" indicates if a thread is garbage-collecting'
cmd = ('from gc import collect\n'
'id(42)\n'
'def foo():\n'
' collect()\n'
'def bar():\n'
' foo()\n'
'bar()\n')
# Verify with "py-bt":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['break update_refs', 'continue', 'py-bt'],
)
self.assertIn('Garbage-collecting', gdb_output)
# Verify with "py-bt-full":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=['break update_refs', 'continue', 'py-bt-full'],
)
self.assertIn('Garbage-collecting', gdb_output)
@unittest.skipIf(python_is_optimized(),
"Python was compiled with optimizations")
def test_wrapper_call(self):
cmd = textwrap.dedent('''
class MyList(list):
def __init__(self):
super(*[]).__init__() # wrapper_call()
id("first break point")
l = MyList()
''')
cmds_after_breakpoint = ['break wrapper_call', 'continue']
if CET_PROTECTION:
# bpo-32962: same case as in get_stack_trace():
# we need an additional 'next' command in order to read
# arguments of the innermost function of the call stack.
cmds_after_breakpoint.append('next')
cmds_after_breakpoint.append('py-bt')
# Verify with "py-bt":
gdb_output = self.get_stack_trace(cmd,
cmds_after_breakpoint=cmds_after_breakpoint)
self.assertRegex(gdb_output,
r"<method-wrapper u?'__init__' of MyList object at ")
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