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3900 lines (3397 loc) · 139 KB
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"""
The Python Debugger Pdb
=======================
To use the debugger in its simplest form:
>>> import pdb
>>> pdb.run('<a statement>')
The debugger's prompt is '(Pdb) '. This will stop in the first
function call in <a statement>.
Alternatively, if a statement terminated with an unhandled exception,
you can use pdb's post-mortem facility to inspect the contents of the
traceback:
>>> <a statement>
<exception traceback>
>>> import pdb
>>> pdb.pm()
The commands recognized by the debugger are listed in the next
section. Most can be abbreviated as indicated; e.g., h(elp) means
that 'help' can be typed as 'h' or 'help' (but not as 'he' or 'hel',
nor as 'H' or 'Help' or 'HELP'). Optional arguments are enclosed in
square brackets. Alternatives in the command syntax are separated
by a vertical bar (|).
A blank line repeats the previous command literally, except for
'list', where it lists the next 11 lines.
Commands that the debugger doesn't recognize are assumed to be Python
statements and are executed in the context of the program being
debugged. Python statements can also be prefixed with an exclamation
point ('!'). This is a powerful way to inspect the program being
debugged; it is even possible to change variables or call functions.
When an exception occurs in such a statement, the exception name is
printed but the debugger's state is not changed.
The debugger supports aliases, which can save typing. And aliases can
have parameters (see the alias help entry) which allows one a certain
level of adaptability to the context under examination.
Multiple commands may be entered on a single line, separated by the
pair ';;'. No intelligence is applied to separating the commands; the
input is split at the first ';;', even if it is in the middle of a
quoted string.
If a file ".pdbrc" exists in your home directory or in the current
directory, it is read in and executed as if it had been typed at the
debugger prompt. This is particularly useful for aliases. If both
files exist, the one in the home directory is read first and aliases
defined there can be overridden by the local file. This behavior can be
disabled by passing the "readrc=False" argument to the Pdb constructor.
Aside from aliases, the debugger is not directly programmable; but it
is implemented as a class from which you can derive your own debugger
class, which you can make as fancy as you like.
Debugger commands
=================
"""
# NOTE: the actual command documentation is collected from docstrings of the
# commands and is appended to __doc__ after the class has been defined.
import os
import io
import re
import sys
import cmd
import bdb
import dis
import code
import glob
import json
import stat
import token
import types
import atexit
import codeop
import pprint
import signal
import socket
import typing
import inspect
import weakref
import builtins
import tempfile
import textwrap
import tokenize
import itertools
import traceback
import linecache
import selectors
import threading
import _colorize
from contextlib import ExitStack, closing, contextmanager
from types import CodeType
from warnings import deprecated
lazy import asyncio
try:
import _pyrepl.utils
except ModuleNotFoundError:
_pyrepl = None
class Restart(Exception):
"""Causes a debugger to be restarted for the debugged python program."""
pass
__all__ = ["run", "pm", "Pdb", "runeval", "runctx", "runcall", "set_trace",
"post_mortem", "set_default_backend", "get_default_backend", "help"]
def find_first_executable_line(code):
""" Try to find the first executable line of the code object.
Equivalently, find the line number of the instruction that's
after RESUME
Return code.co_firstlineno if no executable line is found.
"""
prev = None
for instr in dis.get_instructions(code):
if prev is not None and prev.opname == 'RESUME':
if instr.positions.lineno is not None:
return instr.positions.lineno
return code.co_firstlineno
prev = instr
return code.co_firstlineno
def find_function(funcname, filename):
cre = re.compile(r'(?:async\s+)?def\s+%s(\s*\[.+\])?\s*[(]' % re.escape(funcname))
try:
fp = tokenize.open(filename)
except OSError:
lines = linecache.getlines(filename)
if not lines:
return None
fp = io.StringIO(''.join(lines))
funcdef = ""
funcstart = 0
# consumer of this info expects the first line to be 1
with fp:
for lineno, line in enumerate(fp, start=1):
if cre.match(line):
funcstart, funcdef = lineno, line
elif funcdef:
funcdef += line
if funcdef:
try:
code = compile(funcdef, filename, 'exec')
except SyntaxError:
continue
# We should always be able to find the code object here
funccode = next(c for c in code.co_consts if
isinstance(c, CodeType) and c.co_name == funcname)
lineno_offset = find_first_executable_line(funccode)
return funcname, filename, funcstart + lineno_offset - 1
return None
def lasti2lineno(code, lasti):
linestarts = list(dis.findlinestarts(code))
linestarts.reverse()
for i, lineno in linestarts:
if lasti >= i:
return lineno
return 0
class _rstr(str):
"""String that doesn't quote its repr."""
def __repr__(self):
return self
class _ExecutableTarget:
filename: str
code: CodeType | str
namespace: dict
class _ScriptTarget(_ExecutableTarget):
def __init__(self, target):
self._check(target)
self._target = self._safe_realpath(target)
# If PYTHONSAFEPATH (-P) is not set, sys.path[0] is the directory
# of pdb, and we should replace it with the directory of the script
if not sys.flags.safe_path:
sys.path[0] = os.path.dirname(self._target)
@staticmethod
def _check(target):
"""
Check that target is plausibly a script.
"""
if not os.path.exists(target):
print(f'Error: {target} does not exist')
sys.exit(1)
if os.path.isdir(target):
print(f'Error: {target} is a directory')
sys.exit(1)
@staticmethod
def _safe_realpath(path):
"""
Return the canonical path (realpath) if it is accessible from the userspace.
Otherwise (for example, if the path is a symlink to an anonymous pipe),
return the original path.
See GH-142315.
"""
realpath = os.path.realpath(path)
return realpath if os.path.exists(realpath) else path
def __repr__(self):
return self._target
@property
def filename(self):
return self._target
@property
def code(self):
# Open the file each time because the file may be modified
with io.open_code(self._target) as fp:
return f"exec(compile({fp.read()!r}, {self._target!r}, 'exec'))"
@property
def namespace(self):
return dict(
__name__='__main__',
__file__=self._target,
__builtins__=__builtins__,
__spec__=None,
)
class _ModuleTarget(_ExecutableTarget):
def __init__(self, target):
self._target = target
import runpy
try:
_, self._spec, self._code = runpy._get_module_details(self._target)
except ImportError as e:
print(f"ImportError: {e}")
sys.exit(1)
except Exception:
traceback.print_exc()
sys.exit(1)
def __repr__(self):
return self._target
@property
def filename(self):
return self._code.co_filename
@property
def code(self):
return self._code
@property
def namespace(self):
return dict(
__name__='__main__',
__file__=os.path.normcase(os.path.abspath(self.filename)),
__package__=self._spec.parent,
__loader__=self._spec.loader,
__spec__=self._spec,
__builtins__=__builtins__,
)
class _ZipTarget(_ExecutableTarget):
def __init__(self, target):
import runpy
self._target = os.path.realpath(target)
sys.path.insert(0, self._target)
try:
_, self._spec, self._code = runpy._get_main_module_details()
except ImportError as e:
print(f"ImportError: {e}")
sys.exit(1)
except Exception:
traceback.print_exc()
sys.exit(1)
def __repr__(self):
return self._target
@property
def filename(self):
return self._code.co_filename
@property
def code(self):
return self._code
@property
def namespace(self):
return dict(
__name__='__main__',
__file__=os.path.normcase(os.path.abspath(self.filename)),
__package__=self._spec.parent,
__loader__=self._spec.loader,
__spec__=self._spec,
__builtins__=__builtins__,
)
class _PdbInteractiveConsole(code.InteractiveConsole):
def __init__(self, ns=None, message=None):
self._message = message
super().__init__(locals=ns, local_exit=True)
def write(self, data):
if self._message is not None:
self._message(data, end='')
else:
super().write(data)
def more_lines(self, text):
# Generic Python multi-line completeness heuristic.
# Strips pyrepl's trailing auto-indent before compiling.
# This should be functionally identical to simple_interact._more_lines
src = text.rstrip(" \t")
n = len(src)
if n > 0 and text[n-1] == '\n':
text = src
try:
code_obj = self.compile(text, "<stdin>", "single")
except (OverflowError, SyntaxError, ValueError):
lines = text.splitlines(keepends=True)
if len(lines) == 1:
return False
last = lines[-1]
return ((last.startswith((" ", "\t")) or last.strip() != "")
and not last.endswith("\n"))
return code_obj is None
# Interaction prompt line will separate file and call info from code
# text using value of line_prefix string. A newline and arrow may
# be to your liking. You can set it once pdb is imported using the
# command "pdb.line_prefix = '\n% '".
# line_prefix = ': ' # Use this to get the old situation back
line_prefix = '\n-> ' # Probably a better default
# The default backend to use for Pdb instances if not specified
# Should be either 'settrace' or 'monitoring'
_default_backend = 'settrace'
def set_default_backend(backend):
"""Set the default backend to use for Pdb instances."""
global _default_backend
if backend not in ('settrace', 'monitoring'):
raise ValueError("Invalid backend: %s" % backend)
_default_backend = backend
def get_default_backend():
"""Get the default backend to use for Pdb instances."""
return _default_backend
def _pyrepl_available():
"""return whether pdb should use _pyrepl for input"""
if os.getenv("PYTHON_BASIC_REPL"):
CAN_USE_PYREPL = False
else:
try:
from _pyrepl.main import CAN_USE_PYREPL
except ModuleNotFoundError:
CAN_USE_PYREPL = False
return CAN_USE_PYREPL
class PdbPyReplInput:
def __init__(self, pdb_instance, stdin, stdout, prompt):
import _pyrepl.readline
self.pdb_instance = pdb_instance
self.prompt = prompt
self.console = _PdbInteractiveConsole()
if not (os.isatty(stdin.fileno())):
raise ValueError("stdin is not a TTY")
self.readline_wrapper = _pyrepl.readline._ReadlineWrapper(
f_in=stdin.fileno(),
f_out=stdout.fileno(),
config=_pyrepl.readline.ReadlineConfig(
completer_delims=frozenset(' \t\n`@#%^&*()=+[{]}\\|;:\'",<>?')
)
)
self.readline_wrapper.get_reader().gen_colors = self.gen_colors
def readline(self):
def more_lines(text):
if text.strip() == "\x1a":
# Ctrl + Z raises EOFError to quit pdb
# This is similarly handled in simple_interact.py
raise EOFError
cmd, _, line = self.pdb_instance.parseline(text)
if not line or not cmd:
return False
func = getattr(self.pdb_instance, 'do_' + cmd, None)
if func is not None:
return False
return self.console.more_lines(text)
try:
pyrepl_completer = self.readline_wrapper.get_completer()
self.readline_wrapper.set_completer(self.complete)
multiline = (
self.readline_wrapper.multiline_input(
more_lines,
self.prompt,
'... ' + ' ' * (len(self.prompt) - 4)
) + '\n'
)
return multiline
except EOFError:
return 'EOF'
finally:
self.readline_wrapper.set_completer(pyrepl_completer)
def complete(self, text, state):
"""
This function is very similar to cmd.Cmd.complete.
However, cmd.Cmd.complete assumes that we use readline module, but
pyrepl does not use it.
"""
if state == 0:
origline = self.readline_wrapper.get_line_buffer()
line = origline.lstrip()
stripped = len(origline) - len(line)
begidx = self.readline_wrapper.get_begidx() - stripped
endidx = self.readline_wrapper.get_endidx() - stripped
if begidx > 0:
cmd, args, foo = self.pdb_instance.parseline(line)
if not cmd:
compfunc = self.pdb_instance.completedefault
else:
try:
compfunc = getattr(self.pdb_instance, 'complete_' + cmd)
except AttributeError:
compfunc = self.pdb_instance.completedefault
else:
compfunc = self.pdb_instance.completenames
self.completion_matches = compfunc(text, line, begidx, endidx)
try:
return self.completion_matches[state]
except IndexError:
return None
def gen_colors(self, buffer):
from _pyrepl.utils import ColorSpan, Span
if not buffer.strip():
return
leading_spaces = len(buffer) - len(buffer.lstrip())
leading_text = buffer.split()[0]
if hasattr(self.pdb_instance, 'do_' + leading_text):
yield ColorSpan(
Span(leading_spaces, leading_spaces + len(leading_text) - 1),
"soft_keyword"
)
# Redact the command text with spaces so there will be no duplicated
# color span generated for it later.
redact_length = leading_spaces + len(leading_text)
buffer = ' ' * redact_length + buffer[redact_length:]
yield from _pyrepl.utils.gen_colors(buffer)
class Pdb(bdb.Bdb, cmd.Cmd):
_previous_sigint_handler = None
# Limit the maximum depth of chained exceptions, we should be handling cycles,
# but in case there are recursions, we stop at 999.
MAX_CHAINED_EXCEPTION_DEPTH = 999
_file_mtime_table = {}
_last_pdb_instance = None
def __init__(self, completekey='tab', stdin=None, stdout=None, skip=None,
nosigint=False, readrc=True, mode=None, backend=None, colorize=False):
bdb.Bdb.__init__(self, skip=skip, backend=backend if backend else get_default_backend())
cmd.Cmd.__init__(self, completekey, stdin, stdout)
sys.audit("pdb.Pdb")
if stdin is not None and stdin is not sys.stdin:
self.use_rawinput = False
self.prompt = '(Pdb) '
self.aliases = {}
self.displaying = {}
self.mainpyfile = ''
self._wait_for_mainpyfile = False
self.tb_lineno = {}
self.mode = mode
self.colorize = colorize and _colorize.can_colorize(file=stdout or sys.stdout)
# Try to load readline if it exists
try:
import readline
# remove some common file name delimiters
readline.set_completer_delims(' \t\n`@#%^&*()=+[{]}\\|;:\'",<>?')
except ImportError:
pass
self.pyrepl_input = None
if _pyrepl_available():
try:
self.pyrepl_input = PdbPyReplInput(self, self.stdin, self.stdout, self.prompt)
except Exception:
pass
self.allow_kbdint = False
self.nosigint = nosigint
# Consider these characters as part of the command so when the users type
# c.a or c['a'], it won't be recognized as a c(ontinue) command
self.identchars = cmd.Cmd.identchars + '=.[](),"\'+-*/%@&|<>~^'
# Read ~/.pdbrc and ./.pdbrc
self.rcLines = []
if readrc:
home_rcfile = os.path.expanduser("~/.pdbrc")
local_rcfile = os.path.abspath(".pdbrc")
try:
with open(home_rcfile, encoding='utf-8') as rcfile:
self.rcLines.extend(rcfile)
except OSError:
pass
if local_rcfile != home_rcfile:
try:
with open(local_rcfile, encoding='utf-8') as rcfile:
self.rcLines.extend(rcfile)
except OSError:
pass
self.commands = {} # associates a command list to breakpoint numbers
self.commands_defining = False # True while in the process of defining
# a command list
self.commands_bnum = None # The breakpoint number for which we are
# defining a list
self.async_shim_frame = None
self.async_awaitable = None
self._chained_exceptions = tuple()
self._chained_exception_index = 0
self._current_task = None
self.lineno = None
self.stack = []
self.curindex = 0
self.curframe = None
self._user_requested_quit = False
def set_trace(self, frame=None, *, commands=None):
Pdb._last_pdb_instance = self
if frame is None:
frame = sys._getframe().f_back
if commands is not None:
self.rcLines.extend(commands)
super().set_trace(frame)
async def set_trace_async(self, frame=None, *, commands=None):
if self.async_awaitable is not None:
# We are already in a set_trace_async call, do not mess with it
return
if frame is None:
frame = sys._getframe().f_back
# We need set_trace to set up the basics, however, this will call
# set_stepinstr() will we need to compensate for, because we don't
# want to trigger on calls
self.set_trace(frame, commands=commands)
# Changing the stopframe will disable trace dispatch on calls
self.stopframe = frame
# We need to stop tracing because we don't have the privilege to avoid
# triggering tracing functions as normal, as we are not already in
# tracing functions
self.stop_trace()
self.async_shim_frame = sys._getframe()
self.async_awaitable = None
while True:
self.async_awaitable = None
# Simulate a trace event
# This should bring up pdb and make pdb believe it's debugging the
# caller frame
self.trace_dispatch(frame, "opcode", None)
if self.async_awaitable is not None:
try:
if self.breaks:
with self.set_enterframe(frame):
# set_continue requires enterframe to work
self.set_continue()
self.start_trace()
await self.async_awaitable
except Exception:
self._error_exc()
else:
break
self.async_shim_frame = None
# start the trace (the actual command is already set by set_* calls)
if self.returnframe is None and self.stoplineno == -1 and not self.breaks:
# This means we did a continue without any breakpoints, we should not
# start the trace
return
self.start_trace()
def sigint_handler(self, signum, frame):
if self.allow_kbdint:
raise KeyboardInterrupt
self.message("\nProgram interrupted. (Use 'cont' to resume).")
self.set_step()
self.set_trace(frame)
def reset(self):
bdb.Bdb.reset(self)
self.forget()
def forget(self):
self.lineno = None
self.stack = []
self.curindex = 0
if self.curframe:
self.curframe.f_globals.pop('__pdb_convenience_variables', None)
self.curframe = None
self.tb_lineno.clear()
def setup(self, f, tb):
self.forget()
self.stack, self.curindex = self.get_stack(f, tb)
while tb:
# when setting up post-mortem debugging with a traceback, save all
# the original line numbers to be displayed along the current line
# numbers (which can be different, e.g. due to finally clauses)
lineno = lasti2lineno(tb.tb_frame.f_code, tb.tb_lasti)
self.tb_lineno[tb.tb_frame] = lineno
tb = tb.tb_next
self.curframe = self.stack[self.curindex][0]
self.set_convenience_variable(self.curframe, '_frame', self.curframe)
if self._current_task:
self.set_convenience_variable(self.curframe, '_asynctask', self._current_task)
self._save_initial_file_mtime(self.curframe)
if self._chained_exceptions:
self.set_convenience_variable(
self.curframe,
'_exception',
self._chained_exceptions[self._chained_exception_index],
)
if self.rcLines:
self.cmdqueue = [
line for line in self.rcLines
if line.strip() and not line.strip().startswith("#")
]
self.rcLines = []
@property
@deprecated("The frame locals reference is no longer cached. Use 'curframe.f_locals' instead.")
def curframe_locals(self):
return self.curframe.f_locals
@curframe_locals.setter
@deprecated("Setting 'curframe_locals' no longer has any effect. Update the contents of 'curframe.f_locals' instead.")
def curframe_locals(self, value):
pass
# Override Bdb methods
def user_call(self, frame, argument_list):
"""This method is called when there is the remote possibility
that we ever need to stop in this function."""
if self._wait_for_mainpyfile:
return
if self.stop_here(frame):
self.message('--Call--')
self.interaction(frame, None)
def user_line(self, frame):
"""This function is called when we stop or break at this line."""
if self._wait_for_mainpyfile:
if (self.mainpyfile != self.canonic(frame.f_code.co_filename)):
return
self._wait_for_mainpyfile = False
if self.trace_opcodes:
# GH-127321
# We want to avoid stopping at an opcode that does not have
# an associated line number because pdb does not like it
if frame.f_lineno is None:
self.set_stepinstr()
return
self.bp_commands(frame)
self.interaction(frame, None)
user_opcode = user_line
def bp_commands(self, frame):
"""Call every command that was set for the current active breakpoint
(if there is one).
Returns True if the normal interaction function must be called,
False otherwise."""
# self.currentbp is set in bdb in Bdb.break_here if a breakpoint was hit
if getattr(self, "currentbp", False) and \
self.currentbp in self.commands:
currentbp = self.currentbp
self.currentbp = 0
for line in self.commands[currentbp]:
self.cmdqueue.append(line)
self.cmdqueue.append(f'_pdbcmd_restore_lastcmd {self.lastcmd}')
def user_return(self, frame, return_value):
"""This function is called when a return trap is set here."""
if self._wait_for_mainpyfile:
return
frame.f_locals['__return__'] = return_value
self.set_convenience_variable(frame, '_retval', return_value)
self.message('--Return--')
self.interaction(frame, None)
def user_exception(self, frame, exc_info):
"""This function is called if an exception occurs,
but only if we are to stop at or just below this level."""
if self._wait_for_mainpyfile:
return
exc_type, exc_value, exc_traceback = exc_info
frame.f_locals['__exception__'] = exc_type, exc_value
self.set_convenience_variable(frame, '_exception', exc_value)
# An 'Internal StopIteration' exception is an exception debug event
# issued by the interpreter when handling a subgenerator run with
# 'yield from' or a generator controlled by a for loop. No exception has
# actually occurred in this case. The debugger uses this debug event to
# stop when the debuggee is returning from such generators.
prefix = 'Internal ' if (not exc_traceback
and exc_type is StopIteration) else ''
self.message('%s%s' % (prefix, self._format_exc(exc_value)))
self.interaction(frame, exc_traceback)
@contextmanager
def _replace_attribute(self, attrs):
original_attrs = {}
for attr, value in attrs.items():
original_attrs[attr] = getattr(self, attr)
setattr(self, attr, value)
try:
yield
finally:
for attr, value in original_attrs.items():
setattr(self, attr, value)
@contextmanager
def _maybe_use_pyrepl_as_stdin(self):
if self.pyrepl_input is None:
yield
return
with self._replace_attribute({
'stdin': self.pyrepl_input,
'use_rawinput': False,
'prompt': '',
}):
yield
# General interaction function
def _cmdloop(self):
while True:
try:
# keyboard interrupts allow for an easy way to cancel
# the current command, so allow them during interactive input
self.allow_kbdint = True
with self._maybe_use_pyrepl_as_stdin():
self.cmdloop()
self.allow_kbdint = False
break
except KeyboardInterrupt:
self.message('--KeyboardInterrupt--')
def _save_initial_file_mtime(self, frame):
"""save the mtime of the all the files in the frame stack in the file mtime table
if they haven't been saved yet."""
while frame:
filename = frame.f_code.co_filename
if filename not in self._file_mtime_table:
try:
self._file_mtime_table[filename] = os.path.getmtime(filename)
except Exception:
pass
frame = frame.f_back
def _validate_file_mtime(self):
"""Check if the source file of the current frame has been modified.
If so, give a warning and reset the modify time to current."""
try:
filename = self.curframe.f_code.co_filename
mtime = os.path.getmtime(filename)
except Exception:
return
if (filename in self._file_mtime_table and
mtime != self._file_mtime_table[filename]):
self.message(f"*** WARNING: file '{filename}' was edited, "
"running stale code until the program is rerun")
self._file_mtime_table[filename] = mtime
# Called before loop, handles display expressions
# Set up convenience variable containers
def _show_display(self):
displaying = self.displaying.get(self.curframe)
if displaying:
for expr, oldvalue in displaying.items():
newvalue = self._getval_except(expr)
# check for identity first; this prevents custom __eq__ to
# be called at every loop, and also prevents instances whose
# fields are changed to be displayed
if newvalue is not oldvalue and newvalue != oldvalue:
displaying[expr] = newvalue
self.message('display %s: %s [old: %s]' %
(expr, self._safe_repr(newvalue, expr),
self._safe_repr(oldvalue, expr)))
def _get_tb_and_exceptions(self, tb_or_exc):
"""
Given a traceback or an exception, return a tuple of chained exceptions
and current traceback to inspect.
This will deal with selecting the right ``__cause__`` or ``__context__``
as well as handling cycles, and return a flattened list of exceptions we
can jump to with do_exceptions.
"""
_exceptions = []
if isinstance(tb_or_exc, BaseException):
traceback, current = tb_or_exc.__traceback__, tb_or_exc
while current is not None:
if current in _exceptions:
break
_exceptions.append(current)
if current.__cause__ is not None:
current = current.__cause__
elif (
current.__context__ is not None and not current.__suppress_context__
):
current = current.__context__
if len(_exceptions) >= self.MAX_CHAINED_EXCEPTION_DEPTH:
self.message(
f"More than {self.MAX_CHAINED_EXCEPTION_DEPTH}"
" chained exceptions found, not all exceptions"
"will be browsable with `exceptions`."
)
break
else:
traceback = tb_or_exc
return tuple(reversed(_exceptions)), traceback
@contextmanager
def _hold_exceptions(self, exceptions):
"""
Context manager to ensure proper cleaning of exceptions references
When given a chained exception instead of a traceback,
pdb may hold references to many objects which may leak memory.
We use this context manager to make sure everything is properly cleaned
"""
try:
self._chained_exceptions = exceptions
self._chained_exception_index = len(exceptions) - 1
yield
finally:
# we can't put those in forget as otherwise they would
# be cleared on exception change
self._chained_exceptions = tuple()
self._chained_exception_index = 0
def _get_asyncio_task(self):
# If asyncio has never been imported there cannot be a running task,
# so skip the import rather than pay for it on every interaction.
if 'asyncio' not in sys.modules:
return None
try:
task = asyncio.current_task()
except RuntimeError:
task = None
return task
def interaction(self, frame, tb_or_exc):
# Restore the previous signal handler at the Pdb prompt.
if Pdb._previous_sigint_handler:
try:
signal.signal(signal.SIGINT, Pdb._previous_sigint_handler)
except ValueError: # ValueError: signal only works in main thread
pass
else:
Pdb._previous_sigint_handler = None
self._current_task = self._get_asyncio_task()
_chained_exceptions, tb = self._get_tb_and_exceptions(tb_or_exc)
if isinstance(tb_or_exc, BaseException):
assert tb is not None, "main exception must have a traceback"
with self._hold_exceptions(_chained_exceptions):
self.setup(frame, tb)
# We should print the stack entry if and only if the user input
# is expected, and we should print it right before the user input.
# We achieve this by appending _pdbcmd_print_frame_status to the
# command queue. If cmdqueue is not exhausted, the user input is
# not expected and we will not print the stack entry.
self.cmdqueue.append('_pdbcmd_print_frame_status')
self._cmdloop()
# If _pdbcmd_print_frame_status is not used, pop it out
if self.cmdqueue and self.cmdqueue[-1] == '_pdbcmd_print_frame_status':
self.cmdqueue.pop()
self.forget()
def displayhook(self, obj):
"""Custom displayhook for the exec in default(), which prevents
assignment of the _ variable in the builtins.
"""
# reproduce the behavior of the standard displayhook, not printing None
if obj is not None:
self.message(repr(obj))
@contextmanager
def _enable_multiline_input(self):
try:
import readline
except ImportError:
yield
return
def input_auto_indent():
last_index = readline.get_current_history_length()
last_line = readline.get_history_item(last_index)
if last_line:
if last_line.isspace():
# If the last line is empty, we don't need to indent
return
last_line = last_line.rstrip('\r\n')
indent = len(last_line) - len(last_line.lstrip())
if last_line.endswith(":"):
indent += 4
readline.insert_text(' ' * indent)
completenames = self.completenames
try:
self.completenames = self.complete_multiline_names
readline.set_startup_hook(input_auto_indent)
yield
finally:
readline.set_startup_hook()
self.completenames = completenames
return
def _exec_in_closure(self, source, globals, locals):
""" Run source code in closure so code object created within source
can find variables in locals correctly
returns True if the source is executed, False otherwise
"""
# Determine if the source should be executed in closure. Only when the
# source compiled to multiple code objects, we should use this feature.
# Otherwise, we can just raise an exception and normal exec will be used.
code = compile(source, "<string>", "exec")
if not any(isinstance(const, CodeType) for const in code.co_consts):
return False
# locals could be a proxy which does not support pop
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