cpython/Lib/pdb.py

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# pdb.py -- finally, a Python debugger!
# (See pdb.doc for documentation.)
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import string
import sys
import linecache
import cmd
import bdb
import repr
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class Pdb(bdb.Bdb, cmd.Cmd):
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def init(self):
self = bdb.Bdb.init(self)
self = cmd.Cmd.init(self)
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self.prompt = '(Pdb) '
return self
def reset(self):
bdb.Bdb.reset(self)
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self.forget()
def forget(self):
self.lineno = None
self.stack = []
self.curindex = 0
self.curframe = None
def setup(self, f, t):
self.forget()
self.stack, self.curindex = self.get_stack(f, t)
self.curframe = self.stack[self.curindex][0]
# Override Bdb methods (except user_call, for now)
def user_line(self, frame):
# This function is called when we stop or break at this line
self.interaction(frame, None)
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def user_return(self, frame, return_value):
# This function is called when a return trap is set here
frame.f_locals['__return__'] = return_value
print '--Return--'
self.interaction(frame, None)
def user_exception(self, frame, (exc_type, exc_value, exc_traceback)):
# This function is called if an exception occurs,
# but only if we are to stop at or just below this level
frame.f_locals['__exception__'] = exc_type, exc_value
print exc_type + ':', repr.repr(exc_value)
self.interaction(frame, exc_traceback)
# General interaction function
def interaction(self, frame, traceback):
self.setup(frame, traceback)
self.print_stack_entry(self.stack[self.curindex])
self.cmdloop()
self.forget()
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def default(self, line):
if line[:1] == '!': line = line[1:]
locals = self.curframe.f_locals
globals = self.curframe.f_globals
try:
exec(line + '\n', globals, locals)
except:
print '***', sys.exc_type + ':', sys.exc_value
# Command definitions, called by cmdloop()
# The argument is the remaining string on the command line
# Return true to exit from the command loop
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do_h = cmd.Cmd.do_help
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def do_break(self, arg):
if not arg:
print self.get_all_breaks() # XXX
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return
try:
lineno = int(eval(arg))
except:
print '*** Error in argument:', `arg`
return
filename = self.curframe.f_code.co_filename
err = self.set_break(filename, lineno)
if err: print '***', err
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do_b = do_break
def do_clear(self, arg):
if not arg:
try:
reply = raw_input('Clear all breaks? ')
except EOFError:
reply = 'no'
reply = string.lower(string.strip(reply))
if reply in ('y', 'yes'):
self.clear_all_breaks()
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return
try:
lineno = int(eval(arg))
except:
print '*** Error in argument:', `arg`
return
filename = self.curframe.f_code.co_filename
err = self.set_break(filename, lineno)
if err: print '***', err
do_cl = do_clear # 'c' is already an abbreviation for 'continue'
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def do_where(self, arg):
self.print_stack_trace()
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do_w = do_where
def do_up(self, arg):
if self.curindex == 0:
print '*** Oldest frame'
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else:
self.curindex = self.curindex - 1
self.curframe = self.stack[self.curindex][0]
self.print_stack_entry(self.stack[self.curindex])
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do_u = do_up
def do_down(self, arg):
if self.curindex + 1 == len(self.stack):
print '*** Newest frame'
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else:
self.curindex = self.curindex + 1
self.curframe = self.stack[self.curindex][0]
self.print_stack_entry(self.stack[self.curindex])
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do_d = do_down
def do_step(self, arg):
self.set_step()
return 1
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do_s = do_step
def do_next(self, arg):
self.set_next(self.curframe)
return 1
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do_n = do_next
def do_return(self, arg):
self.set_return(self.curframe)
return 1
do_r = do_return
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def do_continue(self, arg):
self.set_continue()
return 1
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do_c = do_cont = do_continue
def do_quit(self, arg):
self.set_quit()
return 1
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do_q = do_quit
def do_args(self, arg):
if self.curframe.f_locals.has_key('__return__'):
print `self.curframe.f_locals['__return__']`
else:
print '*** Not arguments?!'
do_a = do_args
def do_retval(self, arg):
if self.curframe.f_locals.has_key('__return__'):
print self.curframe.f_locals['__return__']
else:
print '*** Not yet returned!'
do_rv = do_retval
def do_p(self, arg):
try:
value = eval(arg, self.curframe.f_globals, \
self.curframe.f_locals)
except:
print '***', sys.exc_type + ':', `sys.exc_value`
return
print `value`
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def do_list(self, arg):
self.lastcmd = 'list'
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last = None
if arg:
try:
x = eval(arg, {}, {})
if type(x) == type(()):
first, last = x
first = int(first)
last = int(last)
if last < first:
# Assume it's a count
last = first + last
else:
first = int(x)
except:
print '*** Error in argument:', `arg`
return
elif self.lineno is None:
first = max(1, self.curframe.f_lineno - 5)
else:
first = self.lineno + 1
if last is None:
last = first + 10
filename = self.curframe.f_code.co_filename
breaklist = self.get_file_breaks(filename)
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try:
for lineno in range(first, last+1):
line = linecache.getline(filename, lineno)
if not line:
print '[EOF]'
break
else:
s = string.rjust(`lineno`, 3)
if len(s) < 4: s = s + ' '
if lineno in breaklist: s = s + 'B'
else: s = s + ' '
if lineno == self.curframe.f_lineno:
s = s + '->'
print s + '\t' + line,
self.lineno = lineno
except KeyboardInterrupt:
pass
do_l = do_list
# Print a traceback starting at the top stack frame.
# The most recently entered frame is printed last;
# this is different from dbx and gdb, but consistent with
# the Python interpreter's stack trace.
# It is also consistent with the up/down commands (which are
# compatible with dbx and gdb: up moves towards 'main()'
# and down moves towards the most recent stack frame).
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def print_stack_trace(self):
try:
for frame_lineno in self.stack:
self.print_stack_entry(frame_lineno)
except KeyboardInterrupt:
pass
def print_stack_entry(self, frame_lineno):
frame, lineno = frame_lineno
if frame is self.curframe:
print '>',
else:
print ' ',
print self.format_stack_entry(frame_lineno)
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def run(statement):
Pdb().init().run(statement)
def runctx(statement, globals, locals):
Pdb().init().runctx(statement, globals, locals)
TESTCMD = 'import x; x.main()'
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def test():
import linecache
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linecache.checkcache()
run(TESTCMD)