mirror of
https://github.com/python/cpython.git
synced 2024-11-27 11:55:13 +08:00
368 lines
9.3 KiB
Python
368 lines
9.3 KiB
Python
# A generic Python debugger base class.
|
|
# This class takes care of details of the trace facility;
|
|
# a derived class should implement user interaction.
|
|
# There are two debuggers based upon this:
|
|
# 'pdb', a text-oriented debugger not unlike dbx or gdb;
|
|
# and 'wdb', a window-oriented debugger.
|
|
# And of course... you can roll your own!
|
|
|
|
import sys
|
|
import types
|
|
|
|
BdbQuit = 'bdb.BdbQuit' # Exception to give up completely
|
|
|
|
|
|
class Bdb: # Basic Debugger
|
|
|
|
def __init__(self):
|
|
self.breaks = {}
|
|
|
|
def reset(self):
|
|
import linecache
|
|
linecache.checkcache()
|
|
self.botframe = None
|
|
self.stopframe = None
|
|
self.returnframe = None
|
|
self.quitting = 0
|
|
|
|
def trace_dispatch(self, frame, event, arg):
|
|
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)
|
|
print 'bdb.Bdb.dispatch: unknown debugging event:', `event`
|
|
return self.trace_dispatch
|
|
|
|
def dispatch_line(self, frame):
|
|
if self.stop_here(frame) or self.break_here(frame):
|
|
self.user_line(frame)
|
|
if self.quitting: raise BdbQuit
|
|
return self.trace_dispatch
|
|
|
|
def dispatch_call(self, frame, arg):
|
|
frame.f_locals['__args__'] = arg
|
|
if self.botframe is None:
|
|
# First call of dispatch since reset()
|
|
self.botframe = frame
|
|
return self.trace_dispatch
|
|
if not (self.stop_here(frame) or self.break_anywhere(frame)):
|
|
# No need to trace this function
|
|
return # None
|
|
self.user_call(frame, arg)
|
|
if self.quitting: raise BdbQuit
|
|
return self.trace_dispatch
|
|
|
|
def dispatch_return(self, frame, arg):
|
|
if self.stop_here(frame) or frame == self.returnframe:
|
|
self.user_return(frame, arg)
|
|
if self.quitting: raise BdbQuit
|
|
|
|
def dispatch_exception(self, frame, arg):
|
|
if self.stop_here(frame):
|
|
self.user_exception(frame, arg)
|
|
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 stop_here(self, frame):
|
|
if self.stopframe is None:
|
|
return 1
|
|
if frame is self.stopframe:
|
|
return 1
|
|
while frame is not None and frame is not self.stopframe:
|
|
if frame is self.botframe:
|
|
return 1
|
|
frame = frame.f_back
|
|
return 0
|
|
|
|
def break_here(self, frame):
|
|
if not self.breaks.has_key(frame.f_code.co_filename):
|
|
return 0
|
|
if not frame.f_lineno in \
|
|
self.breaks[frame.f_code.co_filename]:
|
|
return 0
|
|
return 1
|
|
|
|
def break_anywhere(self, frame):
|
|
return self.breaks.has_key(frame.f_code.co_filename)
|
|
|
|
# Derived classes should override the user_* methods
|
|
# to gain control.
|
|
|
|
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
|
|
pass
|
|
|
|
def user_line(self, frame):
|
|
# This method is called when we stop or break at this line
|
|
pass
|
|
|
|
def user_return(self, frame, return_value):
|
|
# This method is called when a return trap is set here
|
|
pass
|
|
|
|
def user_exception(self, frame, (exc_type, exc_value, exc_traceback)):
|
|
# This method is called if an exception occurs,
|
|
# but only if we are to stop at or just below this level
|
|
pass
|
|
|
|
# Derived classes and clients can call the following methods
|
|
# to affect the stepping state.
|
|
|
|
def set_step(self):
|
|
# Stop after one line of code
|
|
self.stopframe = None
|
|
self.returnframe = None
|
|
self.quitting = 0
|
|
|
|
def set_next(self, frame):
|
|
# Stop on the next line in or below the given frame
|
|
self.stopframe = frame
|
|
self.returnframe = None
|
|
self.quitting = 0
|
|
|
|
def set_return(self, frame):
|
|
# Stop when returning from the given frame
|
|
self.stopframe = frame.f_back
|
|
self.returnframe = frame
|
|
self.quitting = 0
|
|
|
|
def set_trace(self):
|
|
# Start debugging from here
|
|
try:
|
|
1 + ''
|
|
except:
|
|
frame = sys.exc_traceback.tb_frame.f_back
|
|
self.reset()
|
|
while frame:
|
|
frame.f_trace = self.trace_dispatch
|
|
self.botframe = frame
|
|
frame = frame.f_back
|
|
self.set_step()
|
|
sys.settrace(self.trace_dispatch)
|
|
|
|
def set_continue(self):
|
|
# Don't stop except at breakpoints or when finished
|
|
self.stopframe = self.botframe
|
|
self.returnframe = None
|
|
self.quitting = 0
|
|
if not self.breaks:
|
|
# no breakpoints; run without debugger overhead
|
|
sys.settrace(None)
|
|
try:
|
|
1 + '' # raise an exception
|
|
except:
|
|
frame = sys.exc_traceback.tb_frame.f_back
|
|
while frame and frame is not self.botframe:
|
|
del frame.f_trace
|
|
frame = frame.f_back
|
|
|
|
def set_quit(self):
|
|
self.stopframe = self.botframe
|
|
self.returnframe = None
|
|
self.quitting = 1
|
|
sys.settrace(None)
|
|
|
|
# Derived classes and clients can call the following methods
|
|
# to manipulate breakpoints. These methods return an
|
|
# error message is something went wrong, None if all is well.
|
|
# Call self.get_*break*() to see the breakpoints.
|
|
|
|
def set_break(self, filename, lineno):
|
|
import linecache # Import as late as possible
|
|
line = linecache.getline(filename, lineno)
|
|
if not line:
|
|
return 'That line does not exist!'
|
|
if not self.breaks.has_key(filename):
|
|
self.breaks[filename] = []
|
|
list = self.breaks[filename]
|
|
if lineno in list:
|
|
return 'There is already a breakpoint there!'
|
|
list.append(lineno)
|
|
|
|
def clear_break(self, filename, lineno):
|
|
if not self.breaks.has_key(filename):
|
|
return 'There are no breakpoints in that file!'
|
|
if lineno not in self.breaks[filename]:
|
|
return 'There is no breakpoint there!'
|
|
self.breaks[filename].remove(lineno)
|
|
if not self.breaks[filename]:
|
|
del self.breaks[filename]
|
|
|
|
def clear_all_file_breaks(self, filename):
|
|
if not self.breaks.has_key(filename):
|
|
return 'There are no breakpoints in that file!'
|
|
del self.breaks[filename]
|
|
|
|
def clear_all_breaks(self):
|
|
if not self.breaks:
|
|
return 'There are no breakpoints!'
|
|
self.breaks = {}
|
|
|
|
def get_break(self, filename, lineno):
|
|
return self.breaks.has_key(filename) and \
|
|
lineno in self.breaks[filename]
|
|
|
|
def get_file_breaks(self, filename):
|
|
if self.breaks.has_key(filename):
|
|
return self.breaks[filename]
|
|
else:
|
|
return []
|
|
|
|
def get_all_breaks(self):
|
|
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):
|
|
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
|
|
return stack, i
|
|
|
|
#
|
|
|
|
def format_stack_entry(self, frame_lineno, lprefix=': '):
|
|
import linecache, repr, string
|
|
frame, lineno = frame_lineno
|
|
filename = frame.f_code.co_filename
|
|
s = filename + '(' + `lineno` + ')'
|
|
if frame.f_code.co_name:
|
|
s = s + frame.f_code.co_name
|
|
else:
|
|
s = s + "<lambda>"
|
|
if frame.f_locals.has_key('__args__'):
|
|
args = frame.f_locals['__args__']
|
|
else:
|
|
args = None
|
|
if args:
|
|
s = s + repr.repr(args)
|
|
else:
|
|
s = s + '()'
|
|
if frame.f_locals.has_key('__return__'):
|
|
rv = frame.f_locals['__return__']
|
|
s = s + '->'
|
|
s = s + repr.repr(rv)
|
|
line = linecache.getline(filename, lineno)
|
|
if line: s = s + lprefix + string.strip(line)
|
|
return s
|
|
|
|
# The following two methods can be called by clients to use
|
|
# a debugger to debug a statement, given as a string.
|
|
|
|
def run(self, cmd, globals=None, locals=None):
|
|
if globals is None:
|
|
import __main__
|
|
globals = __main__.__dict__
|
|
if locals is None:
|
|
locals = globals
|
|
self.reset()
|
|
sys.settrace(self.trace_dispatch)
|
|
if type(cmd) <> types.CodeType:
|
|
cmd = cmd+'\n'
|
|
try:
|
|
try:
|
|
exec cmd in globals, locals
|
|
except BdbQuit:
|
|
pass
|
|
finally:
|
|
self.quitting = 1
|
|
sys.settrace(None)
|
|
|
|
def runeval(self, expr, globals=None, locals=None):
|
|
if globals is None:
|
|
import __main__
|
|
globals = __main__.__dict__
|
|
if locals is None:
|
|
locals = globals
|
|
self.reset()
|
|
sys.settrace(self.trace_dispatch)
|
|
if type(expr) <> types.CodeType:
|
|
expr = expr+'\n'
|
|
try:
|
|
try:
|
|
return eval(expr, globals, locals)
|
|
except BdbQuit:
|
|
pass
|
|
finally:
|
|
self.quitting = 1
|
|
sys.settrace(None)
|
|
|
|
def runctx(self, cmd, globals, locals):
|
|
# B/W compatibility
|
|
self.run(cmd, globals, locals)
|
|
|
|
# This method is more useful to debug a single function call.
|
|
|
|
def runcall(self, func, *args):
|
|
self.reset()
|
|
sys.settrace(self.trace_dispatch)
|
|
res = None
|
|
try:
|
|
try:
|
|
res = apply(func, args)
|
|
except BdbQuit:
|
|
pass
|
|
finally:
|
|
self.quitting = 1
|
|
sys.settrace(None)
|
|
return res
|
|
|
|
|
|
def set_trace():
|
|
Bdb().set_trace()
|
|
|
|
# -------------------- testing --------------------
|
|
|
|
class Tdb(Bdb):
|
|
def user_call(self, frame, args):
|
|
name = frame.f_code.co_name
|
|
if not name: name = '???'
|
|
print '+++ call', name, args
|
|
def user_line(self, frame):
|
|
import linecache, string
|
|
name = frame.f_code.co_name
|
|
if not name: name = '???'
|
|
fn = frame.f_code.co_filename
|
|
line = linecache.getline(fn, frame.f_lineno)
|
|
print '+++', fn, frame.f_lineno, name, ':', string.strip(line)
|
|
def user_return(self, frame, retval):
|
|
print '+++ return', retval
|
|
def user_exception(self, frame, exc_stuff):
|
|
print '+++ exception', exc_stuff
|
|
self.set_continue()
|
|
|
|
def foo(n):
|
|
print 'foo(', n, ')'
|
|
x = bar(n*10)
|
|
print 'bar returned', x
|
|
|
|
def bar(a):
|
|
print 'bar(', a, ')'
|
|
return a/2
|
|
|
|
def test():
|
|
t = Tdb()
|
|
t.run('import bdb; bdb.foo(10)')
|