Rewritten to use bdb.Bdb as base class.
This commit is contained in:
Guido van Rossum
parent
576136044c
commit
23efba4cd1
383
Lib/pdb.py
383
Lib/pdb.py
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@ -1,194 +1,83 @@
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# pdb.py -- finally, a Python debugger!
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# See file pdb.doc for instructions.
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# To do:
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# - It should be possible to intercept KeyboardInterrupt
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# - Handle return events differently -- always printing the r.v. can be bad!
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# - Merge with tb, to get a single debugger for active and post-mortem usage
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# - Solve bugs in termination (e.g., 'continue' after the program
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# is done proceeds to debug the debugger; 'quit' sometimes complains
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# about the PdbQuit exception...)
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# (See pdb.doc for documentation.)
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import string
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import sys
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import linecache
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from cmd import Cmd
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import cmd
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import bdb
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import repr
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# A specialization of Cmd for use by the debugger
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PdbQuit = 'pdb.PdbQuit' # Exception to give up
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class Pdb(Cmd):
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class Pdb(bdb.Bdb, cmd.Cmd):
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def init(self):
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self = Cmd.init(self)
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self = bdb.Bdb.init(self)
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self = cmd.Cmd.init(self)
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self.prompt = '(Pdb) '
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self.reset()
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return self
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def reset(self):
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self.quitting = 0
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self.breaks = {}
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self.botframe = None
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self.stopframe = None
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self.lastretval = None
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bdb.Bdb.reset(self)
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self.forget()
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def forget(self):
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self.setup(None, None)
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def setup(self, f, t):
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self.lineno = None
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self.stack = []
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self.curindex = 0
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self.curframe = None
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if f is None and t is None:
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return
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if t and t.tb_frame is f:
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t = t.tb_next
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while f is not None:
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self.stack.append((f, f.f_lineno))
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if f is self.botframe:
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break
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f = f.f_back
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else:
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print '[Weird: bottom frame not in stack trace.]'
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self.stack.reverse()
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self.curindex = max(0, len(self.stack) - 1)
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while t is not None:
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self.stack.append((t.tb_frame, t.tb_lineno))
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t = t.tb_next
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def setup(self, f, t):
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self.forget()
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self.stack, self.curindex = self.get_stack(f, t)
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self.curframe = self.stack[self.curindex][0]
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def run(self, cmd):
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import __main__
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dict = __main__.__dict__
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self.runctx(cmd, dict, dict)
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# Override Bdb methods (except user_call, for now)
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def runctx(self, cmd, globals, locals):
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t = None
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self.reset()
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sys.trace = self.dispatch
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try:
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exec(cmd + '\n', globals, locals)
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except PdbQuit:
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return
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except:
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print '***', sys.exc_type + ':', `sys.exc_value`
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t = sys.exc_traceback
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finally:
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self.trace = None
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del self.trace
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self.forget()
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print '!!! Post-mortem debugging'
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self.pmd(t)
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def user_line(self, frame):
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# This function is called when we stop or break at this line
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self.interaction(frame, None)
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def pmd(self, traceback):
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t = traceback
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if self.botframe is not None:
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while t is not None:
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if t.tb_frame is not self.botframe:
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break
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t = t.tb_next
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else:
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t = sys.exc_traceback
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try:
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self.ask_user(self.botframe, t)
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except PdbQuit:
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pass
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finally:
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self.forget()
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def user_return(self, frame, return_value):
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# This function is called when a return trap is set here
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frame.f_locals['__return__'] = return_value
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print '--Return--'
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self.interaction(frame, None)
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def dispatch(self, frame, event, arg):
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if self.quitting:
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return None
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if event == 'line':
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return self.dispatch_line(frame)
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if event == 'call':
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return self.dispatch_call(frame, arg)
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if event == 'return':
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return self.dispatch_return(frame, arg)
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if event == 'exception':
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return self.dispatch_exception(frame, arg)
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print '*** dispatch: unknown event type', `event`
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return self.dispatch
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def user_exception(self, frame, (exc_type, exc_value, exc_traceback)):
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# This function is called if an exception occurs,
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# but only if we are to stop at or just below this level
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frame.f_locals['__exception__'] = exc_type, exc_value
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print exc_type + ':', repr.repr(exc_value)
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self.interaction(frame, exc_traceback)
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def dispatch_line(self, frame):
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if self.stop_here(frame) or self.break_here(frame):
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self.ask_user(frame, None)
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return self.dispatch
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# General interaction function
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def dispatch_call(self, frame, arg):
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if self.botframe is None:
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# First call dispatch since reset()
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self.botframe = frame
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return None
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if not (self.stop_here(frame) or self.break_anywhere(frame)):
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return None
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if arg is None:
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print '[Entering non-function block.]'
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else:
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frame.f_locals['__args__'] = arg
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return self.dispatch
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def dispatch_return(self, frame, arg):
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self.lastretval = arg
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return None
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def dispatch_exception(self, frame, arg):
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if self.stop_here(frame):
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print '!!!', arg[0] + ':', `arg[1]`
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self.ask_user(frame, arg[2])
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return self.dispatch
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def stop_here(self, frame):
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if self.stopframe is None:
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return 1
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if frame is self.stopframe:
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return 1
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while frame is not None and frame is not self.stopframe:
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if frame is self.botframe:
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return 1
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frame = frame.f_back
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return 0
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def break_here(self, frame):
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if not self.breaks.has_key(frame.f_code.co_filename):
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return 0
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if not frame.f_lineno in \
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self.breaks[frame.f_code.co_filename]:
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return 0
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return 1
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def break_anywhere(self, frame):
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return self.breaks.has_key(frame.f_code.co_filename)
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def ask_user(self, frame, traceback):
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def interaction(self, frame, traceback):
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self.setup(frame, traceback)
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self.printframelineno(self.stack[self.curindex])
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self.print_stack_entry(self.stack[self.curindex])
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self.cmdloop()
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self.forget()
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def default(self, line):
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if not line:
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return self.do_next('')
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else:
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if line[0] == '!': line = line[1:]
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try:
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exec(line + '\n', \
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self.curframe.f_globals, \
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self.curframe.f_locals)
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except:
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print '***', sys.exc_type + ':',
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print `sys.exc_value`
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if line[:1] == '!': line = line[1:]
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locals = self.curframe.f_locals
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globals = self.curframe.f_globals
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try:
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exec(line + '\n', globals, locals)
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except:
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print '***', sys.exc_type + ':', sys.exc_value
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do_h = Cmd.do_help
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# Command definitions, called by cmdloop()
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# The argument is the remaining string on the command line
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# 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):
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if not arg:
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print self.breaks # XXX
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print self.get_all_breaks() # XXX
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return
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try:
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lineno = int(eval(arg))
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@ -196,17 +85,8 @@ class Pdb(Cmd):
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print '*** Error in argument:', `arg`
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return
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filename = self.curframe.f_code.co_filename
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line = linecache.getline(filename, lineno)
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if not line:
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print '*** That line does not exist!'
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return
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if not self.breaks.has_key(filename):
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self.breaks[filename] = []
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list = self.breaks[filename]
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if lineno in list:
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print '*** There is already a break there!'
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return
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list.append(lineno)
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err = self.set_break(filename, lineno)
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if err: print '***', err
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do_b = do_break
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def do_clear(self, arg):
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@ -217,7 +97,7 @@ class Pdb(Cmd):
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reply = 'no'
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reply = string.lower(string.strip(reply))
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if reply in ('y', 'yes'):
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self.breaks = {}
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self.clear_all_breaks()
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return
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try:
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lineno = int(eval(arg))
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@ -225,17 +105,12 @@ class Pdb(Cmd):
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print '*** Error in argument:', `arg`
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return
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filename = self.curframe.f_code.co_filename
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try:
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self.breaks[filename].remove(lineno)
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except (ValueError, KeyError):
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print '*** There is no break there!'
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return
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if not self.breaks[filename]:
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del self.breaks[filename]
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err = self.set_break(filename, lineno)
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if err: print '***', err
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do_cl = do_clear # 'c' is already an abbreviation for 'continue'
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def do_where(self, arg):
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self.printstacktrace()
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self.print_stack_trace()
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do_w = do_where
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def do_up(self, arg):
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@ -244,7 +119,7 @@ class Pdb(Cmd):
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else:
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self.curindex = self.curindex - 1
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self.curframe = self.stack[self.curindex][0]
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self.printframelineno(self.stack[self.curindex])
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self.print_stack_entry(self.stack[self.curindex])
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do_u = do_up
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def do_down(self, arg):
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@ -253,39 +128,57 @@ class Pdb(Cmd):
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else:
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self.curindex = self.curindex + 1
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self.curframe = self.stack[self.curindex][0]
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self.printframelineno(self.stack[self.curindex])
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self.print_stack_entry(self.stack[self.curindex])
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do_d = do_down
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def do_step(self, arg):
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self.stopframe = None
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self.set_step()
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return 1
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do_s = do_step
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def do_next(self, arg):
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self.stopframe = self.curframe
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self.set_next(self.curframe)
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return 1
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do_n = do_next
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def do_return(self, arg):
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self.stopframe = self.curframe.f_back
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self.set_return(self.curframe)
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return 1
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do_r = do_return
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def do_retval(self, arg):
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print self.lastretval
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do_rv = do_retval
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def do_continue(self, arg):
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self.stopframe = self.botframe
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self.set_continue()
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return 1
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do_c = do_cont = do_continue
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def do_quit(self, arg):
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self.quitting = 1
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sys.trace = None; del sys.trace
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raise PdbQuit
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self.set_quit()
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return 1
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do_q = do_quit
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def do_args(self, arg):
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if self.curframe.f_locals.has_key('__return__'):
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print `self.curframe.f_locals['__return__']`
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else:
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print '*** Not arguments?!'
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do_a = do_args
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def do_retval(self, arg):
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if self.curframe.f_locals.has_key('__return__'):
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print self.curframe.f_locals['__return__']
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else:
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print '*** Not yet returned!'
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do_rv = do_retval
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def do_p(self, arg):
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try:
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value = eval(arg, self.curframe.f_globals, \
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self.curframe.f_locals)
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except:
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print '***', sys.exc_type + ':', `sys.exc_value`
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return
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print `value`
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def do_list(self, arg):
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self.lastcmd = 'list'
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last = None
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@ -311,10 +204,7 @@ class Pdb(Cmd):
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if last is None:
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last = first + 10
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filename = self.curframe.f_code.co_filename
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if self.breaks.has_key(filename):
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breaklist = self.breaks[filename]
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else:
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breaklist = []
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breaklist = self.get_file_breaks(filename)
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try:
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for lineno in range(first, last+1):
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line = linecache.getline(filename, lineno)
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@ -334,45 +224,28 @@ class Pdb(Cmd):
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pass
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do_l = do_list
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def do_args(self, arg):
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try:
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value = eval('__args__', self.curframe.f_globals, \
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self.curframe.f_locals)
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except:
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print '***', sys.exc_type + ':', `sys.exc_value`
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return
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print `value`
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do_a = do_args
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def do_p(self, arg):
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try:
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value = eval(arg, self.curframe.f_globals, \
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self.curframe.f_locals)
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except:
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print '***', sys.exc_type + ':', `sys.exc_value`
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return
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print `value`
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# Print a traceback starting at the top stack frame.
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# Note that the most recently entered frame is printed last;
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# The most recently entered frame is printed last;
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# this is different from dbx and gdb, but consistent with
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# the Python interpreter's stack trace.
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# It is also consistent with the up/down commands (which are
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# compatible with dbx and gdb: up moves towards 'main()'
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# and down moves towards the most recent stack frame).
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def printstacktrace(self):
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for x in self.stack:
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self.printframelineno(x)
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def print_stack_trace(self):
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try:
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for frame_lineno in self.stack:
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self.print_stack_entry(frame_lineno)
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except KeyboardInterrupt:
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pass
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def printframelineno(self, (frame, lineno)):
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if frame is self.curframe: print '->',
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code = frame.f_code
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filename = code.co_filename
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print filename + '(' + `lineno` + ')',
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line = linecache.getline(filename, lineno)
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print string.strip(line),
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print
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def print_stack_entry(self, frame_lineno):
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frame, lineno = frame_lineno
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if frame is self.curframe:
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print '>',
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else:
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print ' ',
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print self.format_stack_entry(frame_lineno)
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def run(statement):
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@ -381,69 +254,9 @@ def run(statement):
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def runctx(statement, globals, locals):
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Pdb().init().runctx(statement, globals, locals)
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# --------------------- testing ---------------------
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# The Ackermann function -- a highly recursive beast
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cheat = 2
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cache = {}
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def ack(x, y):
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key = `(long(x), long(y))`
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if cache.has_key(key):
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res = cache[key]
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else:
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if x == 0:
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res = 1L
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elif y == 0:
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if x == 1:
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res = 2L
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else:
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res = 2L + x
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elif y == 1 and cheat >= 1:
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res = 2L * x
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elif y == 2 and cheat >= 2:
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res = pow(2L, x)
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else:
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res = ack(ack(x-1, y), y-1)
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cache[key] = res
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return res
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def foo(n):
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print 'foo', n
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x = bar(n*2)
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print 'bar returned', x
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y = ack(4, 3)
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return y
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def bar(a):
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print 'bar', a
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return a*10
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def melt(n):
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print 1.0/n
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melt(n-1)
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TESTCMD = 'import x; x.main()'
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def test():
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import linecache
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linecache.checkcache()
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runctx('from pdb import foo; foo(12)', {}, {})
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runctx('from pdb import melt; melt(5)', {}, {})
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# --------------------- main ---------------------
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import os
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def main():
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if sys.argv[1:]:
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file = sys.argv[1]
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head, tail = os.path.split(file)
|
||||
if tail[-3:] != '.py':
|
||||
print 'Sorry, file arg must be a python module'
|
||||
print '(i.e., must end in \'.py\')'
|
||||
# XXX Or we could copy it to a temp file
|
||||
sys.exit(2)
|
||||
del sys.argv[0]
|
||||
sys.path.insert(0, head)
|
||||
run('import ' + tail[:-3])
|
||||
else:
|
||||
run(raw_input('Python statement to debug: '))
|
||||
run(TESTCMD)
|
||||
|
|
|
|||
Loading…
Reference in New Issue