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1479 lines
52 KiB
Python
Executable File
1479 lines
52 KiB
Python
Executable File
#! /usr/bin/env python3
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"""
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The Python Debugger Pdb
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=======================
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To use the debugger in its simplest form:
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>>> import pdb
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>>> pdb.run('<a statement>')
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The debugger's prompt is '(Pdb) '. This will stop in the first
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function call in <a statement>.
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Alternatively, if a statement terminated with an unhandled exception,
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you can use pdb's post-mortem facility to inspect the contents of the
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traceback:
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>>> <a statement>
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<exception traceback>
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>>> import pdb
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>>> pdb.pm()
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The commands recognized by the debugger are listed in the next
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section. Most can be abbreviated as indicated; e.g., h(elp) means
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that 'help' can be typed as 'h' or 'help' (but not as 'he' or 'hel',
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nor as 'H' or 'Help' or 'HELP'). Optional arguments are enclosed in
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square brackets. Alternatives in the command syntax are separated
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by a vertical bar (|).
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A blank line repeats the previous command literally, except for
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'list', where it lists the next 11 lines.
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Commands that the debugger doesn't recognize are assumed to be Python
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statements and are executed in the context of the program being
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debugged. Python statements can also be prefixed with an exclamation
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point ('!'). This is a powerful way to inspect the program being
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debugged; it is even possible to change variables or call functions.
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When an exception occurs in such a statement, the exception name is
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printed but the debugger's state is not changed.
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The debugger supports aliases, which can save typing. And aliases can
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have parameters (see the alias help entry) which allows one a certain
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level of adaptability to the context under examination.
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Multiple commands may be entered on a single line, separated by the
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pair ';;'. No intelligence is applied to separating the commands; the
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input is split at the first ';;', even if it is in the middle of a
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quoted string.
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If a file ".pdbrc" exists in your home directory or in the current
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directory, it is read in and executed as if it had been typed at the
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debugger prompt. This is particularly useful for aliases. If both
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files exist, the one in the home directory is read first and aliases
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defined there can be overriden by the local file.
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Aside from aliases, the debugger is not directly programmable; but it
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is implemented as a class from which you can derive your own debugger
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class, which you can make as fancy as you like.
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Debugger commands
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=================
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"""
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# NOTE: the actual command documentation is collected from docstrings of the
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# commands and is appended to __doc__ after the class has been defined.
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import sys
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import linecache
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import cmd
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import bdb
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import dis
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import os
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import re
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import pprint
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import traceback
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import inspect
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class Restart(Exception):
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"""Causes a debugger to be restarted for the debugged python program."""
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pass
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__all__ = ["run", "pm", "Pdb", "runeval", "runctx", "runcall", "set_trace",
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"post_mortem", "help"]
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def find_function(funcname, filename):
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cre = re.compile(r'def\s+%s\s*[(]' % re.escape(funcname))
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try:
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fp = open(filename)
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except IOError:
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return None
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# consumer of this info expects the first line to be 1
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lineno = 1
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answer = None
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while 1:
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line = fp.readline()
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if line == '':
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break
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if cre.match(line):
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answer = funcname, filename, lineno
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break
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lineno = lineno + 1
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fp.close()
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return answer
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def getsourcelines(obj):
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lines, lineno = inspect.findsource(obj)
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if inspect.isframe(obj) and obj.f_globals is obj.f_locals:
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# must be a module frame: do not try to cut a block out of it
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return lines, 1
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elif inspect.ismodule(obj):
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return lines, 1
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return inspect.getblock(lines[lineno:]), lineno+1
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def lasti2lineno(code, lasti):
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linestarts = list(dis.findlinestarts(code))
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linestarts.reverse()
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for i, lineno in linestarts:
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if lasti >= i:
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return lineno
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return 0
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# Interaction prompt line will separate file and call info from code
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# text using value of line_prefix string. A newline and arrow may
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# be to your liking. You can set it once pdb is imported using the
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# command "pdb.line_prefix = '\n% '".
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# line_prefix = ': ' # Use this to get the old situation back
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line_prefix = '\n-> ' # Probably a better default
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class Pdb(bdb.Bdb, cmd.Cmd):
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def __init__(self, completekey='tab', stdin=None, stdout=None, skip=None):
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bdb.Bdb.__init__(self, skip=skip)
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cmd.Cmd.__init__(self, completekey, stdin, stdout)
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if stdout:
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self.use_rawinput = 0
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self.prompt = '(Pdb) '
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self.aliases = {}
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self.mainpyfile = ''
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self._wait_for_mainpyfile = 0
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self.tb_lineno = {}
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# Try to load readline if it exists
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try:
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import readline
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except ImportError:
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pass
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# Read $HOME/.pdbrc and ./.pdbrc
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self.rcLines = []
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if 'HOME' in os.environ:
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envHome = os.environ['HOME']
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try:
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with open(os.path.join(envHome, ".pdbrc")) as rcFile:
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self.rcLines.extend(rcFile)
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except IOError:
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pass
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try:
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with open(".pdbrc") as rcFile:
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self.rcLines.extend(rcFile)
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except IOError:
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pass
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self.commands = {} # associates a command list to breakpoint numbers
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self.commands_doprompt = {} # for each bp num, tells if the prompt
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# must be disp. after execing the cmd list
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self.commands_silent = {} # for each bp num, tells if the stack trace
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# must be disp. after execing the cmd list
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self.commands_defining = False # True while in the process of defining
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# a command list
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self.commands_bnum = None # The breakpoint number for which we are
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# defining a list
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def reset(self):
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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.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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self.tb_lineno.clear()
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def setup(self, f, tb):
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self.forget()
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self.stack, self.curindex = self.get_stack(f, tb)
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while tb:
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# when setting up post-mortem debugging with a traceback, save all
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# the original line numbers to be displayed along the current line
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# numbers (which can be different, e.g. due to finally clauses)
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lineno = lasti2lineno(tb.tb_frame.f_code, tb.tb_lasti)
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self.tb_lineno[tb.tb_frame] = lineno
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tb = tb.tb_next
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self.curframe = self.stack[self.curindex][0]
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# The f_locals dictionary is updated from the actual frame
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# locals whenever the .f_locals accessor is called, so we
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# cache it here to ensure that modifications are not overwritten.
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self.curframe_locals = self.curframe.f_locals
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return self.execRcLines()
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# Can be executed earlier than 'setup' if desired
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def execRcLines(self):
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if not self.rcLines:
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return
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# local copy because of recursion
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rcLines = self.rcLines
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rcLines.reverse()
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# execute every line only once
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self.rcLines = []
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while rcLines:
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line = rcLines.pop().strip()
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if line and line[0] != '#':
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if self.onecmd(line):
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# if onecmd returns True, the command wants to exit
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# from the interaction, save leftover rc lines
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# to execute before next interaction
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self.rcLines += reversed(rcLines)
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return True
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# Override Bdb methods
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def user_call(self, frame, argument_list):
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"""This method is called when there is the remote possibility
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that we ever need to stop in this function."""
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if self._wait_for_mainpyfile:
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return
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if self.stop_here(frame):
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self.message('--Call--')
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self.interaction(frame, None)
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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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if self._wait_for_mainpyfile:
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if (self.mainpyfile != self.canonic(frame.f_code.co_filename)
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or frame.f_lineno<= 0):
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return
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self._wait_for_mainpyfile = 0
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if self.bp_commands(frame):
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self.interaction(frame, None)
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def bp_commands(self, frame):
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"""Call every command that was set for the current active breakpoint
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(if there is one).
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Returns True if the normal interaction function must be called,
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False otherwise."""
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# self.currentbp is set in bdb in Bdb.break_here if a breakpoint was hit
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if getattr(self, "currentbp", False) and \
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self.currentbp in self.commands:
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currentbp = self.currentbp
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self.currentbp = 0
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lastcmd_back = self.lastcmd
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self.setup(frame, None)
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for line in self.commands[currentbp]:
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self.onecmd(line)
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self.lastcmd = lastcmd_back
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if not self.commands_silent[currentbp]:
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self.print_stack_entry(self.stack[self.curindex])
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if self.commands_doprompt[currentbp]:
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self.cmdloop()
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self.forget()
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return
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return 1
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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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if self._wait_for_mainpyfile:
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return
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frame.f_locals['__return__'] = return_value
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self.message('--Return--')
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self.interaction(frame, None)
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def user_exception(self, frame, exc_info):
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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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if self._wait_for_mainpyfile:
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return
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exc_type, exc_value, exc_traceback = exc_info
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frame.f_locals['__exception__'] = exc_type, exc_value
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self.message(traceback.format_exception_only(exc_type,
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exc_value)[-1].strip())
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self.interaction(frame, exc_traceback)
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# General interaction function
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def interaction(self, frame, traceback):
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if self.setup(frame, traceback):
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# no interaction desired at this time (happens if .pdbrc contains
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# a command like "continue")
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self.forget()
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return
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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 displayhook(self, obj):
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"""Custom displayhook for the exec in default(), which prevents
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assignment of the _ variable in the builtins.
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"""
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# reproduce the behavior of the standard displayhook, not printing None
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if obj is not None:
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self.message(repr(obj))
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def default(self, line):
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if line[:1] == '!': line = line[1:]
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locals = self.curframe_locals
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globals = self.curframe.f_globals
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try:
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code = compile(line + '\n', '<stdin>', 'single')
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save_stdout = sys.stdout
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save_stdin = sys.stdin
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save_displayhook = sys.displayhook
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try:
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sys.stdin = self.stdin
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sys.stdout = self.stdout
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sys.displayhook = self.displayhook
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exec(code, globals, locals)
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finally:
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sys.stdout = save_stdout
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sys.stdin = save_stdin
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sys.displayhook = save_displayhook
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except:
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exc_info = sys.exc_info()[:2]
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self.error(traceback.format_exception_only(*exc_info)[-1].strip())
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def precmd(self, line):
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"""Handle alias expansion and ';;' separator."""
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if not line.strip():
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return line
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args = line.split()
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while args[0] in self.aliases:
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line = self.aliases[args[0]]
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ii = 1
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for tmpArg in args[1:]:
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line = line.replace("%" + str(ii),
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tmpArg)
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ii = ii + 1
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line = line.replace("%*", ' '.join(args[1:]))
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args = line.split()
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# split into ';;' separated commands
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# unless it's an alias command
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if args[0] != 'alias':
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marker = line.find(';;')
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if marker >= 0:
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# queue up everything after marker
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next = line[marker+2:].lstrip()
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self.cmdqueue.append(next)
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line = line[:marker].rstrip()
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return line
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def onecmd(self, line):
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"""Interpret the argument as though it had been typed in response
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to the prompt.
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Checks whether this line is typed at the normal prompt or in
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a breakpoint command list definition.
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"""
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if not self.commands_defining:
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return cmd.Cmd.onecmd(self, line)
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else:
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return self.handle_command_def(line)
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def handle_command_def(self, line):
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"""Handles one command line during command list definition."""
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cmd, arg, line = self.parseline(line)
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if not cmd:
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return
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if cmd == 'silent':
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self.commands_silent[self.commands_bnum] = True
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return # continue to handle other cmd def in the cmd list
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elif cmd == 'end':
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self.cmdqueue = []
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return 1 # end of cmd list
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cmdlist = self.commands[self.commands_bnum]
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if arg:
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cmdlist.append(cmd+' '+arg)
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else:
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cmdlist.append(cmd)
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# Determine if we must stop
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try:
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func = getattr(self, 'do_' + cmd)
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except AttributeError:
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func = self.default
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# one of the resuming commands
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if func.__name__ in self.commands_resuming:
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self.commands_doprompt[self.commands_bnum] = False
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self.cmdqueue = []
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return 1
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return
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# interface abstraction functions
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def message(self, msg):
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print(msg, file=self.stdout)
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def error(self, msg):
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print('***', msg, file=self.stdout)
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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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def do_commands(self, arg):
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"""commands [bpnumber]
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(com) ...
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(com) end
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(Pdb)
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Specify a list of commands for breakpoint number bpnumber.
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The commands themselves are entered on the following lines.
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Type a line containing just 'end' to terminate the commands.
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The commands are executed when the breakpoint is hit.
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To remove all commands from a breakpoint, type commands and
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follow it immediately with end; that is, give no commands.
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With no bpnumber argument, commands refers to the last
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breakpoint set.
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You can use breakpoint commands to start your program up
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again. Simply use the continue command, or step, or any other
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command that resumes execution.
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Specifying any command resuming execution (currently continue,
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step, next, return, jump, quit and their abbreviations)
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terminates the command list (as if that command was
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immediately followed by end). This is because any time you
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resume execution (even with a simple next or step), you may
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encounter another breakpoint -- which could have its own
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command list, leading to ambiguities about which list to
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execute.
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|
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If you use the 'silent' command in the command list, the usual
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message about stopping at a breakpoint is not printed. This
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may be desirable for breakpoints that are to print a specific
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message and then continue. If none of the other commands
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print anything, you will see no sign that the breakpoint was
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reached.
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"""
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if not arg:
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bnum = len(bdb.Breakpoint.bpbynumber) - 1
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else:
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try:
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bnum = int(arg)
|
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except:
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self.error("Usage: commands [bnum]\n ...\n end")
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return
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self.commands_bnum = bnum
|
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# Save old definitions for the case of a keyboard interrupt.
|
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if bnum in self.commands:
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old_command_defs = (self.commands[bnum],
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self.commands_doprompt[bnum],
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self.commands_silent[bnum])
|
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else:
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old_command_defs = None
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self.commands[bnum] = []
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self.commands_doprompt[bnum] = True
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self.commands_silent[bnum] = False
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|
|
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prompt_back = self.prompt
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self.prompt = '(com) '
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self.commands_defining = True
|
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try:
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self.cmdloop()
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except KeyboardInterrupt:
|
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# Restore old definitions.
|
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if old_command_defs:
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self.commands[bnum] = old_command_defs[0]
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self.commands_doprompt[bnum] = old_command_defs[1]
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|
self.commands_silent[bnum] = old_command_defs[2]
|
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else:
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del self.commands[bnum]
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|
del self.commands_doprompt[bnum]
|
|
del self.commands_silent[bnum]
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|
self.error('command definition aborted, old commands restored')
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|
finally:
|
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self.commands_defining = False
|
|
self.prompt = prompt_back
|
|
|
|
def do_break(self, arg, temporary = 0):
|
|
"""b(reak) [ ([filename:]lineno | function) [, condition] ]
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Without argument, list all breaks.
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|
|
|
With a line number argument, set a break at this line in the
|
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current file. With a function name, set a break at the first
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executable line of that function. If a second argument is
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present, it is a string specifying an expression which must
|
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evaluate to true before the breakpoint is honored.
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|
|
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The line number may be prefixed with a filename and a colon,
|
|
to specify a breakpoint in another file (probably one that
|
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hasn't been loaded yet). The file is searched for on
|
|
sys.path; the .py suffix may be omitted.
|
|
"""
|
|
if not arg:
|
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if self.breaks: # There's at least one
|
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self.message("Num Type Disp Enb Where")
|
|
for bp in bdb.Breakpoint.bpbynumber:
|
|
if bp:
|
|
self.message(bp.bpformat())
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return
|
|
# parse arguments; comma has lowest precedence
|
|
# and cannot occur in filename
|
|
filename = None
|
|
lineno = None
|
|
cond = None
|
|
comma = arg.find(',')
|
|
if comma > 0:
|
|
# parse stuff after comma: "condition"
|
|
cond = arg[comma+1:].lstrip()
|
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arg = arg[:comma].rstrip()
|
|
# parse stuff before comma: [filename:]lineno | function
|
|
colon = arg.rfind(':')
|
|
funcname = None
|
|
if colon >= 0:
|
|
filename = arg[:colon].rstrip()
|
|
f = self.lookupmodule(filename)
|
|
if not f:
|
|
self.error('%r not found from sys.path' % filename)
|
|
return
|
|
else:
|
|
filename = f
|
|
arg = arg[colon+1:].lstrip()
|
|
try:
|
|
lineno = int(arg)
|
|
except ValueError:
|
|
self.error('Bad lineno: %s' % arg)
|
|
return
|
|
else:
|
|
# no colon; can be lineno or function
|
|
try:
|
|
lineno = int(arg)
|
|
except ValueError:
|
|
try:
|
|
func = eval(arg,
|
|
self.curframe.f_globals,
|
|
self.curframe_locals)
|
|
except:
|
|
func = arg
|
|
try:
|
|
if hasattr(func, '__func__'):
|
|
func = func.__func__
|
|
code = func.__code__
|
|
#use co_name to identify the bkpt (function names
|
|
#could be aliased, but co_name is invariant)
|
|
funcname = code.co_name
|
|
lineno = code.co_firstlineno
|
|
filename = code.co_filename
|
|
except:
|
|
# last thing to try
|
|
(ok, filename, ln) = self.lineinfo(arg)
|
|
if not ok:
|
|
self.error('The specified object %r is not a function '
|
|
'or was not found along sys.path.' % arg)
|
|
return
|
|
funcname = ok # ok contains a function name
|
|
lineno = int(ln)
|
|
if not filename:
|
|
filename = self.defaultFile()
|
|
# Check for reasonable breakpoint
|
|
line = self.checkline(filename, lineno)
|
|
if line:
|
|
# now set the break point
|
|
err = self.set_break(filename, line, temporary, cond, funcname)
|
|
if err:
|
|
self.error(err, file=self.stdout)
|
|
else:
|
|
bp = self.get_breaks(filename, line)[-1]
|
|
self.message("Breakpoint %d at %s:%d" %
|
|
(bp.number, bp.file, bp.line))
|
|
|
|
# To be overridden in derived debuggers
|
|
def defaultFile(self):
|
|
"""Produce a reasonable default."""
|
|
filename = self.curframe.f_code.co_filename
|
|
if filename == '<string>' and self.mainpyfile:
|
|
filename = self.mainpyfile
|
|
return filename
|
|
|
|
do_b = do_break
|
|
|
|
def do_tbreak(self, arg):
|
|
"""tbreak [ ([filename:]lineno | function) [, condition] ]
|
|
Same arguments as break, but sets a temporary breakpoint: it
|
|
is automatically deleted when first hit.
|
|
"""
|
|
self.do_break(arg, 1)
|
|
|
|
def lineinfo(self, identifier):
|
|
failed = (None, None, None)
|
|
# Input is identifier, may be in single quotes
|
|
idstring = identifier.split("'")
|
|
if len(idstring) == 1:
|
|
# not in single quotes
|
|
id = idstring[0].strip()
|
|
elif len(idstring) == 3:
|
|
# quoted
|
|
id = idstring[1].strip()
|
|
else:
|
|
return failed
|
|
if id == '': return failed
|
|
parts = id.split('.')
|
|
# Protection for derived debuggers
|
|
if parts[0] == 'self':
|
|
del parts[0]
|
|
if len(parts) == 0:
|
|
return failed
|
|
# Best first guess at file to look at
|
|
fname = self.defaultFile()
|
|
if len(parts) == 1:
|
|
item = parts[0]
|
|
else:
|
|
# More than one part.
|
|
# First is module, second is method/class
|
|
f = self.lookupmodule(parts[0])
|
|
if f:
|
|
fname = f
|
|
item = parts[1]
|
|
answer = find_function(item, fname)
|
|
return answer or failed
|
|
|
|
def checkline(self, filename, lineno):
|
|
"""Check whether specified line seems to be executable.
|
|
|
|
Return `lineno` if it is, 0 if not (e.g. a docstring, comment, blank
|
|
line or EOF). Warning: testing is not comprehensive.
|
|
"""
|
|
# this method should be callable before starting debugging, so default
|
|
# to "no globals" if there is no current frame
|
|
globs = self.curframe.f_globals if hasattr(self, 'curframe') else None
|
|
line = linecache.getline(filename, lineno, globs)
|
|
if not line:
|
|
self.message('End of file')
|
|
return 0
|
|
line = line.strip()
|
|
# Don't allow setting breakpoint at a blank line
|
|
if (not line or (line[0] == '#') or
|
|
(line[:3] == '"""') or line[:3] == "'''"):
|
|
self.error('Blank or comment')
|
|
return 0
|
|
return lineno
|
|
|
|
def do_enable(self, arg):
|
|
"""enable bpnumber [bpnumber ...]
|
|
Enables the breakpoints given as a space separated list of
|
|
breakpoint numbers.
|
|
"""
|
|
args = arg.split()
|
|
for i in args:
|
|
try:
|
|
bp = self.get_bpbynumber(i)
|
|
except ValueError as err:
|
|
self.error(err)
|
|
else:
|
|
bp.enable()
|
|
self.message('Enabled %s' % bp)
|
|
|
|
def do_disable(self, arg):
|
|
"""disable bpnumber [bpnumber ...]
|
|
Disables the breakpoints given as a space separated list of
|
|
breakpoint numbers. Disabling a breakpoint means it cannot
|
|
cause the program to stop execution, but unlike clearing a
|
|
breakpoint, it remains in the list of breakpoints and can be
|
|
(re-)enabled.
|
|
"""
|
|
args = arg.split()
|
|
for i in args:
|
|
try:
|
|
bp = self.get_bpbynumber(i)
|
|
except ValueError as err:
|
|
self.error(err)
|
|
else:
|
|
bp.disable()
|
|
self.message('Disabled %s' % bp)
|
|
|
|
def do_condition(self, arg):
|
|
"""condition bpnumber [condition]
|
|
Set a new condition for the breakpoint, an expression which
|
|
must evaluate to true before the breakpoint is honored. If
|
|
condition is absent, any existing condition is removed; i.e.,
|
|
the breakpoint is made unconditional.
|
|
"""
|
|
args = arg.split(' ', 1)
|
|
try:
|
|
cond = args[1]
|
|
except IndexError:
|
|
cond = None
|
|
try:
|
|
bp = self.get_bpbynumber(args[0].strip())
|
|
except ValueError as err:
|
|
self.error(err)
|
|
else:
|
|
bp.cond = cond
|
|
if not cond:
|
|
self.message('Breakpoint %d is now unconditional.' % bp.number)
|
|
else:
|
|
self.message('New condition set for breakpoint %d.' % bp.number)
|
|
|
|
def do_ignore(self, arg):
|
|
"""ignore bpnumber [count]
|
|
Set the ignore count for the given breakpoint number. If
|
|
count is omitted, the ignore count is set to 0. A breakpoint
|
|
becomes active when the ignore count is zero. When non-zero,
|
|
the count is decremented each time the breakpoint is reached
|
|
and the breakpoint is not disabled and any associated
|
|
condition evaluates to true.
|
|
"""
|
|
args = arg.split()
|
|
try:
|
|
count = int(args[1].strip())
|
|
except:
|
|
count = 0
|
|
try:
|
|
bp = self.get_bpbynumber(args[0].strip())
|
|
except ValueError as err:
|
|
self.error(err)
|
|
else:
|
|
bp.ignore = count
|
|
if count > 0:
|
|
if count > 1:
|
|
countstr = '%d crossings' % count
|
|
else:
|
|
countstr = '1 crossing'
|
|
self.message('Will ignore next %s of breakpoint %d.' %
|
|
(countstr, bp.number))
|
|
else:
|
|
self.message('Will stop next time breakpoint %d is reached.'
|
|
% bp.number)
|
|
|
|
def do_clear(self, arg):
|
|
"""cl(ear) filename:lineno\ncl(ear) [bpnumber [bpnumber...]]
|
|
With a space separated list of breakpoint numbers, clear
|
|
those breakpoints. Without argument, clear all breaks (but
|
|
first ask confirmation). With a filename:lineno argument,
|
|
clear all breaks at that line in that file.
|
|
"""
|
|
if not arg:
|
|
try:
|
|
reply = input('Clear all breaks? ')
|
|
except EOFError:
|
|
reply = 'no'
|
|
reply = reply.strip().lower()
|
|
if reply in ('y', 'yes'):
|
|
bplist = [bp for bp in bdb.Breakpoint.bpbynumber if bp]
|
|
self.clear_all_breaks()
|
|
for bp in bplist:
|
|
self.message('Deleted %s' % bp)
|
|
return
|
|
if ':' in arg:
|
|
# Make sure it works for "clear C:\foo\bar.py:12"
|
|
i = arg.rfind(':')
|
|
filename = arg[:i]
|
|
arg = arg[i+1:]
|
|
try:
|
|
lineno = int(arg)
|
|
except ValueError:
|
|
err = "Invalid line number (%s)" % arg
|
|
else:
|
|
bplist = self.get_breaks(filename, lineno)
|
|
err = self.clear_break(filename, lineno)
|
|
if err:
|
|
self.error(err)
|
|
else:
|
|
for bp in bplist:
|
|
self.message('Deleted %s' % bp)
|
|
return
|
|
numberlist = arg.split()
|
|
for i in numberlist:
|
|
try:
|
|
bp = self.get_bpbynumber(i)
|
|
except ValueError as err:
|
|
self.error(err)
|
|
else:
|
|
self.clear_break(bp.file, bp.line)
|
|
self.message('Deleted %s' % bp)
|
|
do_cl = do_clear # 'c' is already an abbreviation for 'continue'
|
|
|
|
def do_where(self, arg):
|
|
"""w(here)
|
|
Print a stack trace, with the most recent frame at the bottom.
|
|
An arrow indicates the "current frame", which determines the
|
|
context of most commands. 'bt' is an alias for this command.
|
|
"""
|
|
self.print_stack_trace()
|
|
do_w = do_where
|
|
do_bt = do_where
|
|
|
|
def _select_frame(self, number):
|
|
assert 0 <= number < len(self.stack)
|
|
self.curindex = number
|
|
self.curframe = self.stack[self.curindex][0]
|
|
self.curframe_locals = self.curframe.f_locals
|
|
self.print_stack_entry(self.stack[self.curindex])
|
|
self.lineno = None
|
|
|
|
def do_up(self, arg):
|
|
"""u(p) [count]
|
|
Move the current frame count (default one) levels up in the
|
|
stack trace (to an older frame).
|
|
"""
|
|
if self.curindex == 0:
|
|
self.error('Oldest frame')
|
|
return
|
|
try:
|
|
count = int(arg or 1)
|
|
except ValueError:
|
|
self.error('Invalid frame count (%s)' % arg)
|
|
return
|
|
if count < 0:
|
|
newframe = 0
|
|
else:
|
|
newframe = max(0, self.curindex - count)
|
|
self._select_frame(newframe)
|
|
do_u = do_up
|
|
|
|
def do_down(self, arg):
|
|
"""d(own) [count]
|
|
Move the current frame count (default one) levels down in the
|
|
stack trace (to a newer frame).
|
|
"""
|
|
if self.curindex + 1 == len(self.stack):
|
|
self.error('Newest frame')
|
|
return
|
|
try:
|
|
count = int(arg or 1)
|
|
except ValueError:
|
|
self.error('Invalid frame count (%s)' % arg)
|
|
return
|
|
if count < 0:
|
|
newframe = len(self.stack) - 1
|
|
else:
|
|
newframe = min(len(self.stack) - 1, self.curindex + count)
|
|
self._select_frame(newframe)
|
|
do_d = do_down
|
|
|
|
def do_until(self, arg):
|
|
"""unt(il) [lineno]
|
|
Without argument, continue execution until the line with a
|
|
number greater than the current one is reached. With a line
|
|
number, continue execution until a line with a number greater
|
|
or equal to that is reached. In both cases, also stop when
|
|
the current frame returns.
|
|
"""
|
|
if arg:
|
|
try:
|
|
lineno = int(arg)
|
|
except ValueError:
|
|
self.error('Error in argument: %r' % arg)
|
|
return
|
|
if lineno <= self.curframe.f_lineno:
|
|
self.error('"until" line number is smaller than current '
|
|
'line number')
|
|
return
|
|
else:
|
|
lineno = None
|
|
self.set_until(self.curframe, lineno)
|
|
return 1
|
|
do_unt = do_until
|
|
|
|
def do_step(self, arg):
|
|
"""s(tep)
|
|
Execute the current line, stop at the first possible occasion
|
|
(either in a function that is called or in the current
|
|
function).
|
|
"""
|
|
self.set_step()
|
|
return 1
|
|
do_s = do_step
|
|
|
|
def do_next(self, arg):
|
|
"""n(ext)
|
|
Continue execution until the next line in the current function
|
|
is reached or it returns.
|
|
"""
|
|
self.set_next(self.curframe)
|
|
return 1
|
|
do_n = do_next
|
|
|
|
def do_run(self, arg):
|
|
"""run [args...]
|
|
Restart the debugged python program. If a string is supplied
|
|
it is splitted with "shlex", and the result is used as the new
|
|
sys.argv. History, breakpoints, actions and debugger options
|
|
are preserved. "restart" is an alias for "run".
|
|
"""
|
|
if arg:
|
|
import shlex
|
|
argv0 = sys.argv[0:1]
|
|
sys.argv = shlex.split(arg)
|
|
sys.argv[:0] = argv0
|
|
# this is caught in the main debugger loop
|
|
raise Restart
|
|
|
|
do_restart = do_run
|
|
|
|
def do_return(self, arg):
|
|
"""r(eturn)
|
|
Continue execution until the current function returns.
|
|
"""
|
|
self.set_return(self.curframe)
|
|
return 1
|
|
do_r = do_return
|
|
|
|
def do_continue(self, arg):
|
|
"""c(ont(inue))
|
|
Continue execution, only stop when a breakpoint is encountered.
|
|
"""
|
|
self.set_continue()
|
|
return 1
|
|
do_c = do_cont = do_continue
|
|
|
|
def do_jump(self, arg):
|
|
"""j(ump) lineno
|
|
Set the next line that will be executed. Only available in
|
|
the bottom-most frame. This lets you jump back and execute
|
|
code again, or jump forward to skip code that you don't want
|
|
to run.
|
|
|
|
It should be noted that not all jumps are allowed -- for
|
|
instance it is not possible to jump into the middle of a
|
|
for loop or out of a finally clause.
|
|
"""
|
|
if self.curindex + 1 != len(self.stack):
|
|
self.error('You can only jump within the bottom frame')
|
|
return
|
|
try:
|
|
arg = int(arg)
|
|
except ValueError:
|
|
self.error("The 'jump' command requires a line number")
|
|
else:
|
|
try:
|
|
# Do the jump, fix up our copy of the stack, and display the
|
|
# new position
|
|
self.curframe.f_lineno = arg
|
|
self.stack[self.curindex] = self.stack[self.curindex][0], arg
|
|
self.print_stack_entry(self.stack[self.curindex])
|
|
except ValueError as e:
|
|
self.error('Jump failed: %s' % e)
|
|
do_j = do_jump
|
|
|
|
def do_debug(self, arg):
|
|
"""debug code
|
|
Enter a recursive debugger that steps through the code
|
|
argument (which is an arbitrary expression or statement to be
|
|
executed in the current environment).
|
|
"""
|
|
sys.settrace(None)
|
|
globals = self.curframe.f_globals
|
|
locals = self.curframe_locals
|
|
p = Pdb(self.completekey, self.stdin, self.stdout)
|
|
p.prompt = "(%s) " % self.prompt.strip()
|
|
self.message("ENTERING RECURSIVE DEBUGGER")
|
|
sys.call_tracing(p.run, (arg, globals, locals))
|
|
self.message("LEAVING RECURSIVE DEBUGGER")
|
|
sys.settrace(self.trace_dispatch)
|
|
self.lastcmd = p.lastcmd
|
|
|
|
def do_quit(self, arg):
|
|
"""q(uit)\nexit
|
|
Quit from the debugger. The program being executed is aborted.
|
|
"""
|
|
self._user_requested_quit = 1
|
|
self.set_quit()
|
|
return 1
|
|
|
|
do_q = do_quit
|
|
do_exit = do_quit
|
|
|
|
def do_EOF(self, arg):
|
|
"""EOF
|
|
Handles the receipt of EOF as a command.
|
|
"""
|
|
self.message('')
|
|
self._user_requested_quit = 1
|
|
self.set_quit()
|
|
return 1
|
|
|
|
def do_args(self, arg):
|
|
"""a(rgs)
|
|
Print the argument list of the current function.
|
|
"""
|
|
co = self.curframe.f_code
|
|
dict = self.curframe_locals
|
|
n = co.co_argcount
|
|
if co.co_flags & 4: n = n+1
|
|
if co.co_flags & 8: n = n+1
|
|
for i in range(n):
|
|
name = co.co_varnames[i]
|
|
if name in dict:
|
|
self.message('%s = %r' % (name, dict[name]))
|
|
else:
|
|
self.message('%s = *** undefined ***' % (name,))
|
|
do_a = do_args
|
|
|
|
def do_retval(self, arg):
|
|
"""retval
|
|
Print the return value for the last return of a function.
|
|
"""
|
|
if '__return__' in self.curframe_locals:
|
|
self.message(repr(self.curframe_locals['__return__']))
|
|
else:
|
|
self.error('Not yet returned!')
|
|
do_rv = do_retval
|
|
|
|
def _getval(self, arg):
|
|
try:
|
|
return eval(arg, self.curframe.f_globals, self.curframe_locals)
|
|
except:
|
|
exc_info = sys.exc_info()[:2]
|
|
self.error(traceback.format_exception_only(*exc_info)[-1].strip())
|
|
raise
|
|
|
|
def do_p(self, arg):
|
|
"""p(rint) expression
|
|
Print the value of the expression.
|
|
"""
|
|
try:
|
|
self.message(repr(self._getval(arg)))
|
|
except:
|
|
pass
|
|
# make "print" an alias of "p" since print isn't a Python statement anymore
|
|
do_print = do_p
|
|
|
|
def do_pp(self, arg):
|
|
"""pp expression
|
|
Pretty-print the value of the expression.
|
|
"""
|
|
try:
|
|
self.message(pprint.pformat(self._getval(arg)))
|
|
except:
|
|
pass
|
|
|
|
def do_list(self, arg):
|
|
"""l(ist) [first [,last] | .]
|
|
|
|
List source code for the current file. Without arguments,
|
|
list 11 lines around the current line or continue the previous
|
|
listing. With . as argument, list 11 lines around the current
|
|
line. With one argument, list 11 lines starting at that line.
|
|
With two arguments, list the given range; if the second
|
|
argument is less than the first, it is a count.
|
|
|
|
The current line in the current frame is indicated by "->".
|
|
If an exception is being debugged, the line where the
|
|
exception was originally raised or propagated is indicated by
|
|
">>", if it differs from the current line.
|
|
"""
|
|
self.lastcmd = 'list'
|
|
last = None
|
|
if arg and arg != '.':
|
|
try:
|
|
if ',' in arg:
|
|
first, last = arg.split(',')
|
|
first = int(first.strip())
|
|
last = int(last.strip())
|
|
if last < first:
|
|
# assume it's a count
|
|
last = first + last
|
|
else:
|
|
first = int(arg.strip())
|
|
first = max(1, first - 5)
|
|
except ValueError:
|
|
self.error('Error in argument: %r' % arg)
|
|
return
|
|
elif self.lineno is None or arg == '.':
|
|
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)
|
|
try:
|
|
lines = linecache.getlines(filename, self.curframe.f_globals)
|
|
self._print_lines(lines[first-1:last], first, breaklist,
|
|
self.curframe)
|
|
self.lineno = min(last, len(lines))
|
|
if len(lines) < last:
|
|
self.message('[EOF]')
|
|
except KeyboardInterrupt:
|
|
pass
|
|
do_l = do_list
|
|
|
|
def do_longlist(self, arg):
|
|
"""longlist | ll
|
|
List the whole source code for the current function or frame.
|
|
"""
|
|
filename = self.curframe.f_code.co_filename
|
|
breaklist = self.get_file_breaks(filename)
|
|
try:
|
|
lines, lineno = getsourcelines(self.curframe)
|
|
except IOError as err:
|
|
self.error(err)
|
|
return
|
|
self._print_lines(lines, lineno, breaklist, self.curframe)
|
|
do_ll = do_longlist
|
|
|
|
def do_source(self, arg):
|
|
"""source expression
|
|
Try to get source code for the given object and display it.
|
|
"""
|
|
try:
|
|
obj = self._getval(arg)
|
|
except:
|
|
return
|
|
try:
|
|
lines, lineno = getsourcelines(obj)
|
|
except (IOError, TypeError) as err:
|
|
self.error(err)
|
|
return
|
|
self._print_lines(lines, lineno)
|
|
|
|
def _print_lines(self, lines, start, breaks=(), frame=None):
|
|
"""Print a range of lines."""
|
|
if frame:
|
|
current_lineno = frame.f_lineno
|
|
exc_lineno = self.tb_lineno.get(frame, -1)
|
|
else:
|
|
current_lineno = exc_lineno = -1
|
|
for lineno, line in enumerate(lines, start):
|
|
s = str(lineno).rjust(3)
|
|
if len(s) < 4:
|
|
s += ' '
|
|
if lineno in breaks:
|
|
s += 'B'
|
|
else:
|
|
s += ' '
|
|
if lineno == current_lineno:
|
|
s += '->'
|
|
elif lineno == exc_lineno:
|
|
s += '>>'
|
|
self.message(s + '\t' + line.rstrip())
|
|
|
|
def do_whatis(self, arg):
|
|
"""whatis arg
|
|
Print the type of the argument.
|
|
"""
|
|
try:
|
|
value = self._getval(arg)
|
|
except:
|
|
# _getval() already printed the error
|
|
return
|
|
code = None
|
|
# Is it a function?
|
|
try:
|
|
code = value.__code__
|
|
except Exception:
|
|
pass
|
|
if code:
|
|
self.message('Function %s' % code.co_name)
|
|
return
|
|
# Is it an instance method?
|
|
try:
|
|
code = value.__func__.__code__
|
|
except Exception:
|
|
pass
|
|
if code:
|
|
self.message('Method %s' % code.co_name)
|
|
return
|
|
# Is it a class?
|
|
if value.__class__ is type:
|
|
self.message('Class %s.%s' % (value.__module__, value.__name__))
|
|
return
|
|
# None of the above...
|
|
self.message(type(value))
|
|
|
|
def do_alias(self, arg):
|
|
"""alias [name [command [parameter parameter ...] ]]
|
|
Create an alias called 'name' that executes 'command'. The
|
|
command must *not* be enclosed in quotes. Replaceable
|
|
parameters can be indicated by %1, %2, and so on, while %* is
|
|
replaced by all the parameters. If no command is given, the
|
|
current alias for name is shown. If no name is given, all
|
|
aliases are listed.
|
|
|
|
Aliases may be nested and can contain anything that can be
|
|
legally typed at the pdb prompt. Note! You *can* override
|
|
internal pdb commands with aliases! Those internal commands
|
|
are then hidden until the alias is removed. Aliasing is
|
|
recursively applied to the first word of the command line; all
|
|
other words in the line are left alone.
|
|
|
|
As an example, here are two useful aliases (especially when
|
|
placed in the .pdbrc file):
|
|
|
|
# Print instance variables (usage "pi classInst")
|
|
alias pi for k in %1.__dict__.keys(): print "%1.",k,"=",%1.__dict__[k]
|
|
# Print instance variables in self
|
|
alias ps pi self
|
|
"""
|
|
args = arg.split()
|
|
if len(args) == 0:
|
|
keys = sorted(self.aliases.keys())
|
|
for alias in keys:
|
|
self.message("%s = %s" % (alias, self.aliases[alias]))
|
|
return
|
|
if args[0] in self.aliases and len(args) == 1:
|
|
self.message("%s = %s" % (args[0], self.aliases[args[0]]))
|
|
else:
|
|
self.aliases[args[0]] = ' '.join(args[1:])
|
|
|
|
def do_unalias(self, arg):
|
|
"""unalias name
|
|
Delete the specified alias.
|
|
"""
|
|
args = arg.split()
|
|
if len(args) == 0: return
|
|
if args[0] in self.aliases:
|
|
del self.aliases[args[0]]
|
|
|
|
# List of all the commands making the program resume execution.
|
|
commands_resuming = ['do_continue', 'do_step', 'do_next', 'do_return',
|
|
'do_quit', 'do_jump']
|
|
|
|
# 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).
|
|
|
|
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, prompt_prefix=line_prefix):
|
|
frame, lineno = frame_lineno
|
|
if frame is self.curframe:
|
|
prefix = '> '
|
|
else:
|
|
prefix = ' '
|
|
self.message(prefix +
|
|
self.format_stack_entry(frame_lineno, prompt_prefix))
|
|
|
|
# Provide help
|
|
|
|
def do_help(self, arg):
|
|
"""h(elp)
|
|
Without argument, print the list of available commands.
|
|
With a command name as argument, print help about that command.
|
|
"help pdb" shows the full pdb documentation.
|
|
"help exec" gives help on the ! command.
|
|
"""
|
|
if not arg:
|
|
return cmd.Cmd.do_help(self, arg)
|
|
try:
|
|
try:
|
|
topic = getattr(self, 'help_' + arg)
|
|
return topic()
|
|
except AttributeError:
|
|
command = getattr(self, 'do_' + arg)
|
|
except AttributeError:
|
|
self.error('No help for %r' % arg)
|
|
else:
|
|
if sys.flags.optimize >= 2:
|
|
self.error('No help for %r; please do not run Python with -OO '
|
|
'if you need command help' % arg)
|
|
return
|
|
self.message(command.__doc__.rstrip())
|
|
|
|
do_h = do_help
|
|
|
|
def help_exec(self):
|
|
"""(!) statement
|
|
Execute the (one-line) statement in the context of the current
|
|
stack frame. The exclamation point can be omitted unless the
|
|
first word of the statement resembles a debugger command. To
|
|
assign to a global variable you must always prefix the command
|
|
with a 'global' command, e.g.:
|
|
(Pdb) global list_options; list_options = ['-l']
|
|
(Pdb)
|
|
"""
|
|
self.message((self.help_exec.__doc__ or '').strip())
|
|
|
|
def help_pdb(self):
|
|
help()
|
|
|
|
# other helper functions
|
|
|
|
def lookupmodule(self, filename):
|
|
"""Helper function for break/clear parsing -- may be overridden.
|
|
|
|
lookupmodule() translates (possibly incomplete) file or module name
|
|
into an absolute file name.
|
|
"""
|
|
if os.path.isabs(filename) and os.path.exists(filename):
|
|
return filename
|
|
f = os.path.join(sys.path[0], filename)
|
|
if os.path.exists(f) and self.canonic(f) == self.mainpyfile:
|
|
return f
|
|
root, ext = os.path.splitext(filename)
|
|
if ext == '':
|
|
filename = filename + '.py'
|
|
if os.path.isabs(filename):
|
|
return filename
|
|
for dirname in sys.path:
|
|
while os.path.islink(dirname):
|
|
dirname = os.readlink(dirname)
|
|
fullname = os.path.join(dirname, filename)
|
|
if os.path.exists(fullname):
|
|
return fullname
|
|
return None
|
|
|
|
def _runscript(self, filename):
|
|
# The script has to run in __main__ namespace (or imports from
|
|
# __main__ will break).
|
|
#
|
|
# So we clear up the __main__ and set several special variables
|
|
# (this gets rid of pdb's globals and cleans old variables on restarts).
|
|
import __main__
|
|
__main__.__dict__.clear()
|
|
__main__.__dict__.update({"__name__" : "__main__",
|
|
"__file__" : filename,
|
|
"__builtins__": __builtins__,
|
|
})
|
|
|
|
# When bdb sets tracing, a number of call and line events happens
|
|
# BEFORE debugger even reaches user's code (and the exact sequence of
|
|
# events depends on python version). So we take special measures to
|
|
# avoid stopping before we reach the main script (see user_line and
|
|
# user_call for details).
|
|
self._wait_for_mainpyfile = 1
|
|
self.mainpyfile = self.canonic(filename)
|
|
self._user_requested_quit = 0
|
|
with open(filename, "rb") as fp:
|
|
statement = "exec(compile(%r, %r, 'exec'))" % \
|
|
(fp.read(), self.mainpyfile)
|
|
self.run(statement)
|
|
|
|
# Collect all command help into docstring, if not run with -OO
|
|
|
|
if __doc__ is not None:
|
|
# unfortunately we can't guess this order from the class definition
|
|
_help_order = [
|
|
'help', 'where', 'down', 'up', 'break', 'tbreak', 'clear', 'disable',
|
|
'enable', 'ignore', 'condition', 'commands', 'step', 'next', 'until',
|
|
'jump', 'return', 'retval', 'run', 'continue', 'list', 'longlist',
|
|
'args', 'print', 'pp', 'whatis', 'source', 'alias', 'unalias',
|
|
'debug', 'quit',
|
|
]
|
|
|
|
for _command in _help_order:
|
|
__doc__ += getattr(Pdb, 'do_' + _command).__doc__.strip() + '\n\n'
|
|
__doc__ += Pdb.help_exec.__doc__
|
|
|
|
del _help_order, _command
|
|
|
|
|
|
# Simplified interface
|
|
|
|
def run(statement, globals=None, locals=None):
|
|
Pdb().run(statement, globals, locals)
|
|
|
|
def runeval(expression, globals=None, locals=None):
|
|
return Pdb().runeval(expression, globals, locals)
|
|
|
|
def runctx(statement, globals, locals):
|
|
# B/W compatibility
|
|
run(statement, globals, locals)
|
|
|
|
def runcall(*args, **kwds):
|
|
return Pdb().runcall(*args, **kwds)
|
|
|
|
def set_trace():
|
|
Pdb().set_trace(sys._getframe().f_back)
|
|
|
|
# Post-Mortem interface
|
|
|
|
def post_mortem(t=None):
|
|
# handling the default
|
|
if t is None:
|
|
# sys.exc_info() returns (type, value, traceback) if an exception is
|
|
# being handled, otherwise it returns None
|
|
t = sys.exc_info()[2]
|
|
if t is None:
|
|
raise ValueError("A valid traceback must be passed if no "
|
|
"exception is being handled")
|
|
|
|
p = Pdb()
|
|
p.reset()
|
|
p.interaction(None, t)
|
|
|
|
def pm():
|
|
post_mortem(sys.last_traceback)
|
|
|
|
|
|
# Main program for testing
|
|
|
|
TESTCMD = 'import x; x.main()'
|
|
|
|
def test():
|
|
run(TESTCMD)
|
|
|
|
# print help
|
|
def help():
|
|
import pydoc
|
|
pydoc.pager(__doc__)
|
|
|
|
_usage = """\
|
|
usage: pdb.py [-c command] ... pyfile [arg] ...
|
|
|
|
Debug the Python program given by pyfile.
|
|
|
|
Initial commands are read from .pdbrc files in your home directory
|
|
and in the current directory, if they exist. Commands supplied with
|
|
-c are executed after commands from .pdbrc files.
|
|
|
|
To let the script run until an exception occurs, use "-c continue".
|
|
To let the script run up to a given line X in the debugged file, use
|
|
"-c 'until X'"."""
|
|
|
|
def main():
|
|
import getopt
|
|
|
|
opts, args = getopt.getopt(sys.argv[1:], 'hc:', ['--help', '--command='])
|
|
|
|
if not args:
|
|
print(_usage)
|
|
sys.exit(2)
|
|
|
|
commands = []
|
|
for opt, optarg in opts:
|
|
if opt in ['-h', '--help']:
|
|
print(_usage)
|
|
sys.exit()
|
|
elif opt in ['-c', '--command']:
|
|
commands.append(optarg)
|
|
|
|
mainpyfile = args[0] # Get script filename
|
|
if not os.path.exists(mainpyfile):
|
|
print('Error:', mainpyfile, 'does not exist')
|
|
sys.exit(1)
|
|
|
|
sys.argv[:] = args # Hide "pdb.py" and pdb options from argument list
|
|
|
|
# Replace pdb's dir with script's dir in front of module search path.
|
|
sys.path[0] = os.path.dirname(mainpyfile)
|
|
|
|
# Note on saving/restoring sys.argv: it's a good idea when sys.argv was
|
|
# modified by the script being debugged. It's a bad idea when it was
|
|
# changed by the user from the command line. There is a "restart" command
|
|
# which allows explicit specification of command line arguments.
|
|
pdb = Pdb()
|
|
pdb.rcLines.extend(commands)
|
|
while True:
|
|
try:
|
|
pdb._runscript(mainpyfile)
|
|
if pdb._user_requested_quit:
|
|
break
|
|
print("The program finished and will be restarted")
|
|
except Restart:
|
|
print("Restarting", mainpyfile, "with arguments:")
|
|
print("\t" + " ".join(args))
|
|
except SystemExit:
|
|
# In most cases SystemExit does not warrant a post-mortem session.
|
|
print("The program exited via sys.exit(). Exit status:", end=' ')
|
|
print(sys.exc_info()[1])
|
|
except:
|
|
traceback.print_exc()
|
|
print("Uncaught exception. Entering post mortem debugging")
|
|
print("Running 'cont' or 'step' will restart the program")
|
|
t = sys.exc_info()[2]
|
|
pdb.interaction(None, t)
|
|
print("Post mortem debugger finished. The " + mainpyfile +
|
|
" will be restarted")
|
|
|
|
|
|
# When invoked as main program, invoke the debugger on a script
|
|
if __name__ == '__main__':
|
|
import pdb
|
|
pdb.main()
|