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1206 lines (1039 loc) · 43.8 KB
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"""Debugger basics"""
import fnmatch
import sys
import threading
import os
import weakref
from contextlib import contextmanager
from inspect import CO_GENERATOR, CO_COROUTINE, CO_ASYNC_GENERATOR
__all__ = ["BdbQuit", "Bdb", "Breakpoint"]
GENERATOR_AND_COROUTINE_FLAGS = CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR
class BdbQuit(Exception):
"""Exception to give up completely."""
E = sys.monitoring.events
class _MonitoringTracer:
EVENT_CALLBACK_MAP = {
E.PY_START: 'call',
E.PY_RESUME: 'call',
E.PY_THROW: 'call',
E.LINE: 'line',
E.JUMP: 'jump',
E.PY_RETURN: 'return',
E.PY_YIELD: 'return',
E.PY_UNWIND: 'unwind',
E.RAISE: 'exception',
E.STOP_ITERATION: 'exception',
E.INSTRUCTION: 'opcode',
}
GLOBAL_EVENTS = E.PY_START | E.PY_RESUME | E.PY_THROW | E.PY_UNWIND | E.RAISE
LOCAL_EVENTS = E.LINE | E.JUMP | E.PY_RETURN | E.PY_YIELD | E.STOP_ITERATION
def __init__(self):
self._tool_id = sys.monitoring.DEBUGGER_ID
self._name = 'bdbtracer'
self._tracefunc = None
self._disable_current_event = False
self._tracing_thread = None
self._enabled = False
def start_trace(self, tracefunc):
self._tracefunc = tracefunc
self._tracing_thread = threading.current_thread()
curr_tool = sys.monitoring.get_tool(self._tool_id)
if curr_tool is None:
sys.monitoring.use_tool_id(self._tool_id, self._name)
elif curr_tool == self._name:
sys.monitoring.clear_tool_id(self._tool_id)
else:
raise ValueError('Another debugger is using the monitoring tool')
E = sys.monitoring.events
all_events = 0
for event, cb_name in self.EVENT_CALLBACK_MAP.items():
callback = self.callback_wrapper(getattr(self, f'{cb_name}_callback'), event)
sys.monitoring.register_callback(self._tool_id, event, callback)
if event != E.INSTRUCTION:
all_events |= event
self.update_local_events()
sys.monitoring.set_events(self._tool_id, self.GLOBAL_EVENTS)
self._enabled = True
def stop_trace(self):
self._enabled = False
self._tracing_thread = None
curr_tool = sys.monitoring.get_tool(self._tool_id)
if curr_tool != self._name:
return
sys.monitoring.clear_tool_id(self._tool_id)
sys.monitoring.free_tool_id(self._tool_id)
def disable_current_event(self):
self._disable_current_event = True
def restart_events(self):
if sys.monitoring.get_tool(self._tool_id) == self._name:
sys.monitoring.restart_events()
def callback_wrapper(self, func, event):
import functools
@functools.wraps(func)
def wrapper(*args):
if self._tracing_thread != threading.current_thread():
return
try:
frame = sys._getframe().f_back
ret = func(frame, *args)
if self._enabled and frame.f_trace:
self.update_local_events()
if (
self._disable_current_event
and event not in (E.PY_THROW, E.PY_UNWIND, E.RAISE)
):
return sys.monitoring.DISABLE
else:
return ret
except BaseException:
self.stop_trace()
sys._getframe().f_back.f_trace = None
raise
finally:
self._disable_current_event = False
return wrapper
def call_callback(self, frame, code, *args):
local_tracefunc = self._tracefunc(frame, 'call', None)
if local_tracefunc is not None:
frame.f_trace = local_tracefunc
if self._enabled:
sys.monitoring.set_local_events(self._tool_id, code, self.LOCAL_EVENTS)
def return_callback(self, frame, code, offset, retval):
if frame.f_trace:
frame.f_trace(frame, 'return', retval)
def unwind_callback(self, frame, code, *args):
if frame.f_trace:
frame.f_trace(frame, 'return', None)
def line_callback(self, frame, code, *args):
if frame.f_trace and frame.f_trace_lines:
frame.f_trace(frame, 'line', None)
def jump_callback(self, frame, code, inst_offset, dest_offset):
if dest_offset > inst_offset:
return sys.monitoring.DISABLE
inst_lineno = self._get_lineno(code, inst_offset)
dest_lineno = self._get_lineno(code, dest_offset)
if inst_lineno != dest_lineno:
return sys.monitoring.DISABLE
if frame.f_trace and frame.f_trace_lines:
frame.f_trace(frame, 'line', None)
def exception_callback(self, frame, code, offset, exc):
if frame.f_trace:
if exc.__traceback__ and hasattr(exc.__traceback__, 'tb_frame'):
tb = exc.__traceback__
while tb:
if tb.tb_frame.f_locals.get('self') is self:
return
tb = tb.tb_next
frame.f_trace(frame, 'exception', (type(exc), exc, exc.__traceback__))
def opcode_callback(self, frame, code, offset):
if frame.f_trace and frame.f_trace_opcodes:
frame.f_trace(frame, 'opcode', None)
def update_local_events(self, frame=None):
if sys.monitoring.get_tool(self._tool_id) != self._name:
return
if frame is None:
frame = sys._getframe().f_back
while frame is not None:
if frame.f_trace is not None:
if frame.f_trace_opcodes:
events = self.LOCAL_EVENTS | E.INSTRUCTION
else:
events = self.LOCAL_EVENTS
sys.monitoring.set_local_events(self._tool_id, frame.f_code, events)
frame = frame.f_back
def _get_lineno(self, code, offset):
import dis
last_lineno = None
for start, lineno in dis.findlinestarts(code):
if offset < start:
return last_lineno
last_lineno = lineno
return last_lineno
class Bdb:
"""Generic Python debugger base class.
This class takes care of details of the trace facility;
a derived class should implement user interaction.
The standard debugger class (pdb.Pdb) is an example.
The optional skip argument must be an iterable of glob-style
module name patterns. The debugger will not step into frames
that originate in a module that matches one of these patterns.
Whether a frame is considered to originate in a certain module
is determined by the __name__ in the frame globals.
"""
def __init__(self, skip=None, backend='settrace'):
self.skip = set(skip) if skip else None
self.breaks = {}
self.fncache = {}
self.frame_trace_lines_opcodes = {}
self.frame_returning = None
self.trace_opcodes = False
self.enterframe = None
self.cmdframe = None
self.cmdlineno = None
self.code_linenos = weakref.WeakKeyDictionary()
self.backend = backend
if backend == 'monitoring':
self.monitoring_tracer = _MonitoringTracer()
elif backend == 'settrace':
self.monitoring_tracer = None
else:
raise ValueError(f"Invalid backend '{backend}'")
self._load_breaks()
def canonic(self, filename):
"""Return canonical form of filename.
For real filenames, the canonical form is a case-normalized (on
case insensitive filesystems) absolute path. 'Filenames' with
angle brackets, such as "<stdin>", generated in interactive
mode, are returned unchanged.
"""
if filename == "<" + filename[1:-1] + ">":
return filename
canonic = self.fncache.get(filename)
if not canonic:
canonic = os.path.abspath(filename)
canonic = os.path.normcase(canonic)
self.fncache[filename] = canonic
return canonic
def start_trace(self):
if self.monitoring_tracer:
self.monitoring_tracer.start_trace(self.trace_dispatch)
else:
sys.settrace(self.trace_dispatch)
def stop_trace(self):
if self.monitoring_tracer:
self.monitoring_tracer.stop_trace()
else:
sys.settrace(None)
def reset(self):
"""Set values of attributes as ready to start debugging."""
import linecache
linecache.checkcache()
self.botframe = None
self._set_stopinfo(None, None)
@contextmanager
def set_enterframe(self, frame):
self.enterframe = frame
yield
self.enterframe = None
def trace_dispatch(self, frame, event, arg):
"""Dispatch a trace function for debugged frames based on the event.
This function is installed as the trace function for debugged
frames. Its return value is the new trace function, which is
usually itself. The default implementation decides how to
dispatch a frame, depending on the type of event (passed in as a
string) that is about to be executed.
The event can be one of the following:
line: A new line of code is going to be executed.
call: A function is about to be called or another code block
is entered.
return: A function or other code block is about to return.
exception: An exception has occurred.
c_call: A C function is about to be called.
c_return: A C function has returned.
c_exception: A C function has raised an exception.
For the Python events, specialized functions (see the dispatch_*()
methods) are called. For the C events, no action is taken.
The arg parameter depends on the previous event.
"""
with self.set_enterframe(frame):
if self.quitting:
return # None
if event == 'line':
return self.dispatch_line(frame)
if event == 'call':
return self.dispatch_call(frame, arg)
if event == 'return':
return self.dispatch_return(frame, arg)
if event == 'exception':
return self.dispatch_exception(frame, arg)
if event == 'c_call':
return self.trace_dispatch
if event == 'c_exception':
return self.trace_dispatch
if event == 'c_return':
return self.trace_dispatch
if event == 'opcode':
return self.dispatch_opcode(frame, arg)
print('bdb.Bdb.dispatch: unknown debugging event:', repr(event))
return self.trace_dispatch
def dispatch_line(self, frame):
"""Invoke user function and return trace function for line event.
If the debugger stops on the current line, invoke
self.user_line(). Raise BdbQuit if self.quitting is set.
Return self.trace_dispatch to continue tracing in this scope.
"""
# GH-136057
# For line events, we don't want to stop at the same line where
# the latest next/step command was issued.
if (self.stop_here(frame) or self.break_here(frame)) and not (
self.cmdframe == frame and self.cmdlineno == frame.f_lineno
):
self.user_line(frame)
self.restart_events()
if self.quitting: raise BdbQuit
elif not self.get_break(frame.f_code.co_filename, frame.f_lineno):
self.disable_current_event()
return self.trace_dispatch
def dispatch_call(self, frame, arg):
"""Invoke user function and return trace function for call event.
If the debugger stops on this function call, invoke
self.user_call(). Raise BdbQuit if self.quitting is set.
Return self.trace_dispatch to continue tracing in this scope.
"""
# XXX 'arg' is no longer used
if self.botframe is None:
# First call of dispatch since reset()
self.botframe = frame.f_back # (CT) Note that this may also be None!
return self.trace_dispatch
if not (self.stop_here(frame) or self.break_anywhere(frame)):
# We already know there's no breakpoint in this function
# If it's a next/until/return command, we don't need any CALL event
# and we don't need to set the f_trace on any new frame.
# If it's a step command, it must either hit stop_here, or skip the
# whole module. Either way, we don't need the CALL event here.
self.disable_current_event()
return # None
# Ignore call events in generator except when stepping.
if self.stopframe and frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS:
return self.trace_dispatch
self.user_call(frame, arg)
self.restart_events()
if self.quitting: raise BdbQuit
return self.trace_dispatch
def dispatch_return(self, frame, arg):
"""Invoke user function and return trace function for return event.
If the debugger stops on this function return, invoke
self.user_return(). Raise BdbQuit if self.quitting is set.
Return self.trace_dispatch to continue tracing in this scope.
"""
if self.stop_here(frame) or frame == self.returnframe:
# Ignore return events in generator except when stepping.
if self.stopframe and frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS:
# It's possible to trigger a StopIteration exception in
# the caller so we must set the trace function in the caller
self._set_caller_tracefunc(frame)
return self.trace_dispatch
try:
self.frame_returning = frame
self.user_return(frame, arg)
self.restart_events()
finally:
self.frame_returning = None
if self.quitting: raise BdbQuit
# The user issued a 'next' or 'until' command.
if self.stopframe is frame and self.stoplineno != -1:
self._set_stopinfo(None, None)
# The previous frame might not have f_trace set, unless we are
# issuing a command that does not expect to stop, we should set
# f_trace
if self.stoplineno != -1:
self._set_caller_tracefunc(frame)
return self.trace_dispatch
def dispatch_exception(self, frame, arg):
"""Invoke user function and return trace function for exception event.
If the debugger stops on this exception, invoke
self.user_exception(). Raise BdbQuit if self.quitting is set.
Return self.trace_dispatch to continue tracing in this scope.
"""
if self.stop_here(frame):
# When stepping with next/until/return in a generator frame, skip
# the internal StopIteration exception (with no traceback)
# triggered by a subiterator run with the 'yield from' statement.
if not (frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS
and arg[0] is StopIteration and arg[2] is None):
self.user_exception(frame, arg)
self.restart_events()
if self.quitting: raise BdbQuit
# Stop at the StopIteration or GeneratorExit exception when the user
# has set stopframe in a generator by issuing a return command, or a
# next/until command at the last statement in the generator before the
# exception.
elif (self.stopframe and frame is not self.stopframe
and self.stopframe.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS
and arg[0] in (StopIteration, GeneratorExit)):
self.user_exception(frame, arg)
self.restart_events()
if self.quitting: raise BdbQuit
return self.trace_dispatch
def dispatch_opcode(self, frame, arg):
"""Invoke user function and return trace function for opcode event.
If the debugger stops on the current opcode, invoke
self.user_opcode(). Raise BdbQuit if self.quitting is set.
Return self.trace_dispatch to continue tracing in this scope.
Opcode event will always trigger the user callback. For now the only
opcode event is from an inline set_trace() and we want to stop there
unconditionally.
"""
self.user_opcode(frame)
self.restart_events()
if self.quitting: raise BdbQuit
return self.trace_dispatch
# Normally derived classes don't override the following
# methods, but they may if they want to redefine the
# definition of stopping and breakpoints.
def is_skipped_module(self, module_name):
"Return True if module_name matches any skip pattern."
if module_name is None: # some modules do not have names
return False
for pattern in self.skip:
if fnmatch.fnmatch(module_name, pattern):
return True
return False
def stop_here(self, frame):
"Return True if frame is below the starting frame in the stack."
# (CT) stopframe may now also be None, see dispatch_call.
# (CT) the former test for None is therefore removed from here.
if self.skip and \
self.is_skipped_module(frame.f_globals.get('__name__')):
return False
if frame is self.stopframe:
if self.stoplineno == -1:
return False
return frame.f_lineno >= self.stoplineno
if not self.stopframe:
return True
return False
def break_here(self, frame):
"""Return True if there is an effective breakpoint for this line.
Check for line or function breakpoint and if in effect.
Delete temporary breakpoints if effective() says to.
"""
filename = self.canonic(frame.f_code.co_filename)
if filename not in self.breaks:
return False
lineno = frame.f_lineno
if lineno not in self.breaks[filename]:
# The line itself has no breakpoint, but maybe the line is the
# first line of a function with breakpoint set by function name.
lineno = frame.f_code.co_firstlineno
if lineno not in self.breaks[filename]:
return False
# flag says ok to delete temp. bp
(bp, flag) = effective(filename, lineno, frame)
if bp:
self.currentbp = bp.number
if (flag and bp.temporary):
self.do_clear(str(bp.number))
return True
else:
return False
def do_clear(self, arg):
"""Remove temporary breakpoint.
Must implement in derived classes or get NotImplementedError.
"""
raise NotImplementedError("subclass of bdb must implement do_clear()")
def break_anywhere(self, frame):
"""Return True if there is any breakpoint in that frame
"""
filename = self.canonic(frame.f_code.co_filename)
if filename not in self.breaks:
return False
for lineno in self.breaks[filename]:
if self._lineno_in_frame(lineno, frame):
return True
return False
def _lineno_in_frame(self, lineno, frame):
"""Return True if the line number is in the frame's code object.
"""
code = frame.f_code
if lineno < code.co_firstlineno:
return False
if code not in self.code_linenos:
self.code_linenos[code] = set(lineno for _, _, lineno in code.co_lines())
return lineno in self.code_linenos[code]
# Derived classes should override the user_* methods
# to gain control.
def user_call(self, frame, argument_list):
"""Called if we might stop in a function."""
pass
def user_line(self, frame):
"""Called when we stop or break at a line."""
pass
def user_return(self, frame, return_value):
"""Called when a return trap is set here."""
pass
def user_exception(self, frame, exc_info):
"""Called when we stop on an exception."""
pass
def user_opcode(self, frame):
"""Called when we are about to execute an opcode."""
pass
def _set_trace_opcodes(self, trace_opcodes):
if trace_opcodes != self.trace_opcodes:
self.trace_opcodes = trace_opcodes
frame = self.enterframe
while frame is not None:
frame.f_trace_opcodes = trace_opcodes
if frame is self.botframe:
break
frame = frame.f_back
if self.monitoring_tracer:
self.monitoring_tracer.update_local_events()
def _set_stopinfo(self, stopframe, returnframe, stoplineno=0, opcode=False,
cmdframe=None, cmdlineno=None):
"""Set the attributes for stopping.
If stoplineno is greater than or equal to 0, then stop at line
greater than or equal to the stopline. If stoplineno is -1, then
don't stop at all.
"""
self.stopframe = stopframe
self.returnframe = returnframe
self.quitting = False
# stoplineno >= 0 means: stop at line >= the stoplineno
# stoplineno -1 means: don't stop at all
self.stoplineno = stoplineno
# cmdframe/cmdlineno is the frame/line number when the user issued
# step/next commands.
self.cmdframe = cmdframe
self.cmdlineno = cmdlineno
self._set_trace_opcodes(opcode)
def _set_caller_tracefunc(self, current_frame):
# Issue #13183: pdb skips frames after hitting a breakpoint and running
# step commands.
# Restore the trace function in the caller (that may not have been set
# for performance reasons) when returning from the current frame, unless
# the caller is the botframe.
caller_frame = current_frame.f_back
if caller_frame and not caller_frame.f_trace and caller_frame is not self.botframe:
caller_frame.f_trace = self.trace_dispatch
# Derived classes and clients can call the following methods
# to affect the stepping state.
def set_until(self, frame, lineno=None):
"""Stop when the line with the lineno greater than the current one is
reached or when returning from current frame."""
# the name "until" is borrowed from gdb
if lineno is None:
lineno = frame.f_lineno + 1
self._set_stopinfo(frame, frame, lineno)
def set_step(self):
"""Stop after one line of code."""
# set_step() could be called from signal handler so enterframe might be None
self._set_stopinfo(None, None, cmdframe=self.enterframe,
cmdlineno=getattr(self.enterframe, 'f_lineno', None))
def set_stepinstr(self):
"""Stop before the next instruction."""
self._set_stopinfo(None, None, opcode=True)
def set_next(self, frame):
"""Stop on the next line in or below the given frame."""
self._set_stopinfo(frame, None, cmdframe=frame, cmdlineno=frame.f_lineno)
def set_return(self, frame):
"""Stop when returning from the given frame."""
if frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS:
self._set_stopinfo(frame, frame, -1)
else:
self._set_stopinfo(frame.f_back, frame)
def set_trace(self, frame=None):
"""Start debugging from frame.
If frame is not specified, debugging starts from caller's frame.
"""
self.stop_trace()
if frame is None:
frame = sys._getframe().f_back
self.reset()
with self.set_enterframe(frame):
while frame:
frame.f_trace = self.trace_dispatch
self.botframe = frame
self.frame_trace_lines_opcodes[frame] = (frame.f_trace_lines, frame.f_trace_opcodes)
# We need f_trace_lines == True for the debugger to work
frame.f_trace_lines = True
frame = frame.f_back
self.set_stepinstr()
self.enterframe = None
self.start_trace()
def set_continue(self):
"""Stop only at breakpoints or when finished.
If there are no breakpoints, set the system trace function to None.
"""
# Don't stop except at breakpoints or when finished
self._set_stopinfo(self.botframe, None, -1)
if not self.breaks:
# no breakpoints; run without debugger overhead
self.stop_trace()
frame = sys._getframe().f_back
while frame and frame is not self.botframe:
del frame.f_trace
frame = frame.f_back
for frame, (trace_lines, trace_opcodes) in self.frame_trace_lines_opcodes.items():
frame.f_trace_lines, frame.f_trace_opcodes = trace_lines, trace_opcodes
if self.backend == 'monitoring':
self.monitoring_tracer.update_local_events()
self.frame_trace_lines_opcodes = {}
def set_quit(self):
"""Set quitting attribute to True.
Raises BdbQuit exception in the next call to a dispatch_*() method.
"""
self.stopframe = self.botframe
self.returnframe = None
self.quitting = True
self.stop_trace()
# Derived classes and clients can call the following methods
# to manipulate breakpoints. These methods return an
# error message if something went wrong, None if all is well.
# Set_break prints out the breakpoint line and file:lineno.
# Call self.get_*break*() to see the breakpoints or better
# for bp in Breakpoint.bpbynumber: if bp: bp.bpprint().
def _add_to_breaks(self, filename, lineno):
"""Add breakpoint to breaks, if not already there."""
bp_linenos = self.breaks.setdefault(filename, [])
if lineno not in bp_linenos:
bp_linenos.append(lineno)
def set_break(self, filename, lineno, temporary=False, cond=None,
funcname=None):
"""Set a new breakpoint for filename:lineno.
If lineno doesn't exist for the filename, return an error message.
The filename should be in canonical form.
"""
filename = self.canonic(filename)
import linecache # Import as late as possible
line = linecache.getline(filename, lineno)
if not line:
return 'Line %s:%d does not exist' % (filename, lineno)
self._add_to_breaks(filename, lineno)
bp = Breakpoint(filename, lineno, temporary, cond, funcname)
# After we set a new breakpoint, we need to search through all frames
# and set f_trace to trace_dispatch if there could be a breakpoint in
# that frame.
frame = self.enterframe
while frame:
if self.break_anywhere(frame):
frame.f_trace = self.trace_dispatch
frame = frame.f_back
return None
def _load_breaks(self):
"""Apply all breakpoints (set in other instances) to this one.
Populates this instance's breaks list from the Breakpoint class's
list, which can have breakpoints set by another Bdb instance. This
is necessary for interactive sessions to keep the breakpoints
active across multiple calls to run().
"""
for (filename, lineno) in Breakpoint.bplist.keys():
self._add_to_breaks(filename, lineno)
def _prune_breaks(self, filename, lineno):
"""Prune breakpoints for filename:lineno.
A list of breakpoints is maintained in the Bdb instance and in
the Breakpoint class. If a breakpoint in the Bdb instance no
longer exists in the Breakpoint class, then it's removed from the
Bdb instance.
"""
if (filename, lineno) not in Breakpoint.bplist:
self.breaks[filename].remove(lineno)
if not self.breaks[filename]:
del self.breaks[filename]
def clear_break(self, filename, lineno):
"""Delete breakpoints for filename:lineno.
If no breakpoints were set, return an error message.
"""
filename = self.canonic(filename)
if filename not in self.breaks:
return 'There are no breakpoints in %s' % filename
if lineno not in self.breaks[filename]:
return 'There is no breakpoint at %s:%d' % (filename, lineno)
# If there's only one bp in the list for that file,line
# pair, then remove the breaks entry
for bp in Breakpoint.bplist[filename, lineno][:]:
bp.deleteMe()
self._prune_breaks(filename, lineno)
return None
def clear_bpbynumber(self, arg):
"""Delete a breakpoint by its index in Breakpoint.bpbynumber.
If arg is invalid, return an error message.
"""
try:
bp = self.get_bpbynumber(arg)
except ValueError as err:
return str(err)
bp.deleteMe()
self._prune_breaks(bp.file, bp.line)
return None
def clear_all_file_breaks(self, filename):
"""Delete all breakpoints in filename.
If none were set, return an error message.
"""
filename = self.canonic(filename)
if filename not in self.breaks:
return 'There are no breakpoints in %s' % filename
for line in self.breaks[filename]:
blist = Breakpoint.bplist[filename, line]
for bp in blist:
bp.deleteMe()
del self.breaks[filename]
return None
def clear_all_breaks(self):
"""Delete all existing breakpoints.
If none were set, return an error message.
"""
if not self.breaks:
return 'There are no breakpoints'
for bp in Breakpoint.bpbynumber:
if bp:
bp.deleteMe()
self.breaks = {}
return None
def get_bpbynumber(self, arg):
"""Return a breakpoint by its index in Breakpoint.bybpnumber.
For invalid arg values or if the breakpoint doesn't exist,
raise a ValueError.
"""
if not arg:
raise ValueError('Breakpoint number expected')
try:
number = int(arg)
except ValueError:
raise ValueError('Non-numeric breakpoint number %s' % arg) from None
try:
bp = Breakpoint.bpbynumber[number]
except IndexError:
raise ValueError('Breakpoint number %d out of range' % number) from None
if bp is None:
raise ValueError('Breakpoint %d already deleted' % number)
return bp
def get_break(self, filename, lineno):
"""Return True if there is a breakpoint for filename:lineno."""
filename = self.canonic(filename)
return filename in self.breaks and \
lineno in self.breaks[filename]
def get_breaks(self, filename, lineno):
"""Return all breakpoints for filename:lineno.
If no breakpoints are set, return an empty list.
"""
filename = self.canonic(filename)
return filename in self.breaks and \
lineno in self.breaks[filename] and \
Breakpoint.bplist[filename, lineno] or []
def get_file_breaks(self, filename):
"""Return all lines with breakpoints for filename.
If no breakpoints are set, return an empty list.
"""
filename = self.canonic(filename)
if filename in self.breaks:
return self.breaks[filename]
else:
return []
def get_all_breaks(self):
"""Return all breakpoints that are set."""
return self.breaks
# Derived classes and clients can call the following method
# to get a data structure representing a stack trace.
def get_stack(self, f, t):
"""Return a list of (frame, lineno) in a stack trace and a size.
List starts with original calling frame, if there is one.
Size may be number of frames above or below f.
"""
stack = []
if t and t.tb_frame is f:
t = t.tb_next
while f is not None:
stack.append((f, f.f_lineno))
if f is self.botframe:
break
f = f.f_back
stack.reverse()
i = max(0, len(stack) - 1)
while t is not None:
stack.append((t.tb_frame, t.tb_lineno))
t = t.tb_next
if f is None:
i = max(0, len(stack) - 1)
return stack, i
def format_stack_entry(self, frame_lineno, lprefix=': '):
"""Return a string with information about a stack entry.
The stack entry frame_lineno is a (frame, lineno) tuple. The
return string contains the canonical filename, the function name
or '<lambda>', the input arguments, the return value, and the
line of code (if it exists).
"""
import linecache, reprlib
frame, lineno = frame_lineno
filename = self.canonic(frame.f_code.co_filename)
s = '%s(%r)' % (filename, lineno)
if frame.f_code.co_name:
s += frame.f_code.co_name
else:
s += "<lambda>"
s += '()'
if '__return__' in frame.f_locals:
rv = frame.f_locals['__return__']
s += '->'
s += reprlib.repr(rv)
if lineno is not None:
line = linecache.getline(filename, lineno, frame.f_globals)
if line:
s += lprefix + line.strip()
else:
s += f'{lprefix}Warning: lineno is None'
return s
def disable_current_event(self):
"""Disable the current event."""
if self.backend == 'monitoring':
self.monitoring_tracer.disable_current_event()
def restart_events(self):
"""Restart all events."""
if self.backend == 'monitoring':
self.monitoring_tracer.restart_events()
# The following methods can be called by clients to use
# a debugger to debug a statement or an expression.
# Both can be given as a string, or a code object.
def run(self, cmd, globals=None, locals=None):
"""Debug a statement executed via the exec() function.
globals defaults to __main__.dict; locals defaults to globals.
"""
if globals is None:
import __main__
globals = __main__.__dict__
if locals is None:
locals = globals
self.reset()
if isinstance(cmd, str):
cmd = compile(cmd, "<string>", "exec")
self.start_trace()
try:
exec(cmd, globals, locals)
except BdbQuit:
pass
finally:
self.quitting = True
self.stop_trace()
def runeval(self, expr, globals=None, locals=None):
"""Debug an expression executed via the eval() function.
globals defaults to __main__.dict; locals defaults to globals.
"""
if globals is None:
import __main__
globals = __main__.__dict__
if locals is None:
locals = globals
self.reset()
self.start_trace()
try:
return eval(expr, globals, locals)
except BdbQuit:
pass
finally:
self.quitting = True
self.stop_trace()
def runctx(self, cmd, globals, locals):
"""For backwards-compatibility. Defers to run()."""
# B/W compatibility
self.run(cmd, globals, locals)
# This method is more useful to debug a single function call.
def runcall(self, func, /, *args, **kwds):
"""Debug a single function call.
Return the result of the function call.
"""
self.reset()
self.start_trace()
res = None
try:
res = func(*args, **kwds)
except BdbQuit:
pass
finally:
self.quitting = True
self.stop_trace()
return res
def set_trace():
"""Start debugging with a Bdb instance from the caller's frame."""
Bdb().set_trace()
class Breakpoint:
"""Breakpoint class.
Implements temporary breakpoints, ignore counts, disabling and
(re)-enabling, and conditionals.
Breakpoints are indexed by number through bpbynumber and by
the (file, line) tuple using bplist. The former points to a
single instance of class Breakpoint. The latter points to a
list of such instances since there may be more than one
breakpoint per line.
When creating a breakpoint, its associated filename should be
in canonical form. If funcname is defined, a breakpoint hit will be
counted when the first line of that function is executed. A
conditional breakpoint always counts a hit.
"""
# XXX Keeping state in the class is a mistake -- this means
# you cannot have more than one active Bdb instance.
next = 1 # Next bp to be assigned
bplist = {} # indexed by (file, lineno) tuple
bpbynumber = [None] # Each entry is None or an instance of Bpt
# index 0 is unused, except for marking an
# effective break .... see effective()
def __init__(self, file, line, temporary=False, cond=None, funcname=None):
self.funcname = funcname
# Needed if funcname is not None.
self.func_first_executable_line = None
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