Editing: pdb.py
#! /usr/bin/python2.7 """A Python debugger.""" # (See pdb.doc for documentation.) import sys import linecache import cmd import bdb from repr import Repr import os import re import pprint import traceback class Restart(Exception): """Causes a debugger to be restarted for the debugged python program.""" pass # Create a custom safe Repr instance and increase its maxstring. # The default of 30 truncates error messages too easily. _repr = Repr() _repr.maxstring = 200 _saferepr = _repr.repr __all__ = ["run", "pm", "Pdb", "runeval", "runctx", "runcall", "set_trace", "post_mortem", "help"] def find_function(funcname, filename): cre = re.compile(r'def\s+%s\s*[(]' % re.escape(funcname)) try: fp = open(filename) except IOError: return None # consumer of this info expects the first line to be 1 lineno = 1 answer = None while 1: line = fp.readline() if line == '': break if cre.match(line): answer = funcname, filename, lineno break lineno = lineno + 1 fp.close() return answer # Interaction prompt line will separate file and call info from code # text using value of line_prefix string. A newline and arrow may # be to your liking. You can set it once pdb is imported using the # command "pdb.line_prefix = '\n% '". # line_prefix = ': ' # Use this to get the old situation back line_prefix = '\n-> ' # Probably a better default class Pdb(bdb.Bdb, cmd.Cmd): def __init__(self, completekey='tab', stdin=None, stdout=None, skip=None): bdb.Bdb.__init__(self, skip=skip) cmd.Cmd.__init__(self, completekey, stdin, stdout) if stdout: self.use_rawinput = 0 self.prompt = '(Pdb) ' self.aliases = {} self.mainpyfile = '' self._wait_for_mainpyfile = 0 # Try to load readline if it exists try: import readline except ImportError: pass # Read $HOME/.pdbrc and ./.pdbrc self.rcLines = [] if 'HOME' in os.environ: envHome = os.environ['HOME'] try: rcFile = open(os.path.join(envHome, ".pdbrc")) except IOError: pass else: for line in rcFile.readlines(): self.rcLines.append(line) rcFile.close() try: rcFile = open(".pdbrc") except IOError: pass else: for line in rcFile.readlines(): self.rcLines.append(line) rcFile.close() self.commands = {} # associates a command list to breakpoint numbers self.commands_doprompt = {} # for each bp num, tells if the prompt # must be disp. after execing the cmd list self.commands_silent = {} # for each bp num, tells if the stack trace # must be disp. after execing the cmd list self.commands_defining = False # True while in the process of defining # a command list self.commands_bnum = None # The breakpoint number for which we are # defining a list def reset(self): bdb.Bdb.reset(self) self.forget() def forget(self): self.lineno = None self.stack = [] self.curindex = 0 self.curframe = None def setup(self, f, t): self.forget() self.stack, self.curindex = self.get_stack(f, t) self.curframe = self.stack[self.curindex][0] # The f_locals dictionary is updated from the actual frame # locals whenever the .f_locals accessor is called, so we # cache it here to ensure that modifications are not overwritten. self.curframe_locals = self.curframe.f_locals self.execRcLines() # Can be executed earlier than 'setup' if desired def execRcLines(self): if self.rcLines: # Make local copy because of recursion rcLines = self.rcLines # executed only once self.rcLines = [] for line in rcLines: line = line[:-1] if len(line) > 0 and line[0] != '#': self.onecmd(line) # Override Bdb methods def user_call(self, frame, argument_list): """This method is called when there is the remote possibility that we ever need to stop in this function.""" if self._wait_for_mainpyfile: return if self.stop_here(frame): print >>self.stdout, '--Call--' self.interaction(frame, None) def user_line(self, frame): """This function is called when we stop or break at this line.""" if self._wait_for_mainpyfile: if (self.mainpyfile != self.canonic(frame.f_code.co_filename) or frame.f_lineno<= 0): return self._wait_for_mainpyfile = 0 if self.bp_commands(frame): self.interaction(frame, None) def bp_commands(self,frame): """Call every command that was set for the current active breakpoint (if there is one). Returns True if the normal interaction function must be called, False otherwise.""" # self.currentbp is set in bdb in Bdb.break_here if a breakpoint was hit if getattr(self, "currentbp", False) and \ self.currentbp in self.commands: currentbp = self.currentbp self.currentbp = 0 lastcmd_back = self.lastcmd self.setup(frame, None) for line in self.commands[currentbp]: self.onecmd(line) self.lastcmd = lastcmd_back if not self.commands_silent[currentbp]: self.print_stack_entry(self.stack[self.curindex]) if self.commands_doprompt[currentbp]: self.cmdloop() self.forget() return return 1 def user_return(self, frame, return_value): """This function is called when a return trap is set here.""" if self._wait_for_mainpyfile: return frame.f_locals['__return__'] = return_value print >>self.stdout, '--Return--' self.interaction(frame, None) def user_exception(self, frame, exc_info): """This function is called if an exception occurs, but only if we are to stop at or just below this level.""" if self._wait_for_mainpyfile: return exc_type, exc_value, exc_traceback = exc_info frame.f_locals['__exception__'] = exc_type, exc_value if type(exc_type) == type(''): exc_type_name = exc_type else: exc_type_name = exc_type.__name__ print >>self.stdout, exc_type_name + ':', _saferepr(exc_value) self.interaction(frame, exc_traceback) # General interaction function def interaction(self, frame, traceback): self.setup(frame, traceback) self.print_stack_entry(self.stack[self.curindex]) self.cmdloop() self.forget() def displayhook(self, obj): """Custom displayhook for the exec in default(), which prevents assignment of the _ variable in the builtins. """ # reproduce the behavior of the standard displayhook, not printing None if obj is not None: print repr(obj) def default(self, line): if line[:1] == '!': line = line[1:] locals = self.curframe_locals globals = self.curframe.f_globals try: code = compile(line + '\n', '<stdin>', 'single') save_stdout = sys.stdout save_stdin = sys.stdin save_displayhook = sys.displayhook try: sys.stdin = self.stdin sys.stdout = self.stdout sys.displayhook = self.displayhook exec code in globals, locals finally: sys.stdout = save_stdout sys.stdin = save_stdin sys.displayhook = save_displayhook except: t, v = sys.exc_info()[:2] if type(t) == type(''): exc_type_name = t else: exc_type_name = t.__name__ print >>self.stdout, '***', exc_type_name + ':', v def precmd(self, line): """Handle alias expansion and ';;' separator.""" if not line.strip(): return line args = line.split() while args[0] in self.aliases: line = self.aliases[args[0]] ii = 1 for tmpArg in args[1:]: line = line.replace("%" + str(ii), tmpArg) ii = ii + 1 line = line.replace("%*", ' '.join(args[1:])) args = line.split() # split into ';;' separated commands # unless it's an alias command if args[0] != 'alias': marker = line.find(';;') if marker >= 0: # queue up everything after marker next = line[marker+2:].lstrip() self.cmdqueue.append(next) line = line[:marker].rstrip() return line def onecmd(self, line): """Interpret the argument as though it had been typed in response to the prompt. Checks whether this line is typed at the normal prompt or in a breakpoint command list definition. """ if not self.commands_defining: return cmd.Cmd.onecmd(self, line) else: return self.handle_command_def(line) def handle_command_def(self,line): """Handles one command line during command list definition.""" cmd, arg, line = self.parseline(line) if not cmd: return if cmd == 'silent': self.commands_silent[self.commands_bnum] = True return # continue to handle other cmd def in the cmd list elif cmd == 'end': self.cmdqueue = [] return 1 # end of cmd list cmdlist = self.commands[self.commands_bnum] if arg: cmdlist.append(cmd+' '+arg) else: cmdlist.append(cmd) # Determine if we must stop try: func = getattr(self, 'do_' + cmd) except AttributeError: func = self.default # one of the resuming commands if func.func_name in self.commands_resuming: self.commands_doprompt[self.commands_bnum] = False self.cmdqueue = [] return 1 return # Command definitions, called by cmdloop() # The argument is the remaining string on the command line # Return true to exit from the command loop do_h = cmd.Cmd.do_help def do_commands(self, arg): """Defines a list of commands associated to a breakpoint. Those commands will be executed whenever the breakpoint causes the program to stop execution.""" if not arg: bnum = len(bdb.Breakpoint.bpbynumber)-1 else: try: bnum = int(arg) except: print >>self.stdout, "Usage : commands [bnum]\n ..." \ "\n end" return self.commands_bnum = bnum self.commands[bnum] = [] self.commands_doprompt[bnum] = True self.commands_silent[bnum] = False prompt_back = self.prompt self.prompt = '(com) ' self.commands_defining = True try: self.cmdloop() finally: self.commands_defining = False self.prompt = prompt_back def do_break(self, arg, temporary = 0): # break [ ([filename:]lineno | function) [, "condition"] ] if not arg: if self.breaks: # There's at least one print >>self.stdout, "Num Type Disp Enb Where" for bp in bdb.Breakpoint.bpbynumber: if bp: bp.bpprint(self.stdout) 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() 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: print >>self.stdout, '*** ', repr(filename), print >>self.stdout, 'not found from sys.path' return else: filename = f arg = arg[colon+1:].lstrip() try: lineno = int(arg) except ValueError, msg: print >>self.stdout, '*** Bad lineno:', 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, 'im_func'): func = func.im_func code = func.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: print >>self.stdout, '*** The specified object', print >>self.stdout, repr(arg), print >>self.stdout, 'is not a function' print >>self.stdout, 'or was not found along sys.path.' 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: print >>self.stdout, '***', err else: bp = self.get_breaks(filename, line)[-1] print >>self.stdout, "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): 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: print >>self.stdout, '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] == "'''"): print >>self.stdout, '*** Blank or comment' return 0 return lineno def do_enable(self, arg): args = arg.split() for i in args: try: i = int(i) except ValueError: print >>self.stdout, 'Breakpoint index %r is not a number' % i continue if not (0 <= i < len(bdb.Breakpoint.bpbynumber)): print >>self.stdout, 'No breakpoint numbered', i continue bp = bdb.Breakpoint.bpbynumber[i] if bp: bp.enable() def do_disable(self, arg): args = arg.split() for i in args: try: i = int(i) except ValueError: print >>self.stdout, 'Breakpoint index %r is not a number' % i continue if not (0 <= i < len(bdb.Breakpoint.bpbynumber)): print >>self.stdout, 'No breakpoint numbered', i continue bp = bdb.Breakpoint.bpbynumber[i] if bp: bp.disable() def do_condition(self, arg): # arg is breakpoint number and condition args = arg.split(' ', 1) try: bpnum = int(args[0].strip()) except ValueError: # something went wrong print >>self.stdout, \ 'Breakpoint index %r is not a number' % args[0] return try: cond = args[1] except: cond = None try: bp = bdb.Breakpoint.bpbynumber[bpnum] except IndexError: print >>self.stdout, 'Breakpoint index %r is not valid' % args[0] return if bp: bp.cond = cond if not cond: print >>self.stdout, 'Breakpoint', bpnum, print >>self.stdout, 'is now unconditional.' def do_ignore(self,arg): """arg is bp number followed by ignore count.""" args = arg.split() try: bpnum = int(args[0].strip()) except ValueError: # something went wrong print >>self.stdout, \ 'Breakpoint index %r is not a number' % args[0] return try: count = int(args[1].strip()) except: count = 0 try: bp = bdb.Breakpoint.bpbynumber[bpnum] except IndexError: print >>self.stdout, 'Breakpoint index %r is not valid' % args[0] return if bp: bp.ignore = count if count > 0: reply = 'Will ignore next ' if count > 1: reply = reply + '%d crossings' % count else: reply = reply + '1 crossing' print >>self.stdout, reply + ' of breakpoint %d.' % bpnum else: print >>self.stdout, 'Will stop next time breakpoint', print >>self.stdout, bpnum, 'is reached.' def do_clear(self, arg): """Three possibilities, tried in this order: clear -> clear all breaks, ask for confirmation clear file:lineno -> clear all breaks at file:lineno clear bpno bpno ... -> clear breakpoints by number""" if not arg: try: reply = raw_input('Clear all breaks? ') except EOFError: reply = 'no' reply = reply.strip().lower() if reply in ('y', 'yes'): self.clear_all_breaks() 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: err = self.clear_break(filename, lineno) if err: print >>self.stdout, '***', err return numberlist = arg.split() for i in numberlist: try: i = int(i) except ValueError: print >>self.stdout, 'Breakpoint index %r is not a number' % i continue if not (0 <= i < len(bdb.Breakpoint.bpbynumber)): print >>self.stdout, 'No breakpoint numbered', i continue err = self.clear_bpbynumber(i) if err: print >>self.stdout, '***', err else: print >>self.stdout, 'Deleted breakpoint', i do_cl = do_clear # 'c' is already an abbreviation for 'continue' def do_where(self, arg): self.print_stack_trace() do_w = do_where do_bt = do_where def do_up(self, arg): if self.curindex == 0: print >>self.stdout, '*** Oldest frame' else: self.curindex = self.curindex - 1 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 do_u = do_up def do_down(self, arg): if self.curindex + 1 == len(self.stack): print >>self.stdout, '*** Newest frame' else: self.curindex = self.curindex + 1 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 do_d = do_down def do_until(self, arg): self.set_until(self.curframe) return 1 do_unt = do_until def do_step(self, arg): self.set_step() return 1 do_s = do_step def do_next(self, arg): self.set_next(self.curframe) return 1 do_n = do_next def do_run(self, arg): """Restart program by raising an exception to be caught in the main debugger loop. If arguments were given, set them in sys.argv.""" if arg: import shlex argv0 = sys.argv[0:1] sys.argv = shlex.split(arg) sys.argv[:0] = argv0 raise Restart do_restart = do_run def do_return(self, arg): self.set_return(self.curframe) return 1 do_r = do_return def do_continue(self, arg): self.set_continue() return 1 do_c = do_cont = do_continue def do_jump(self, arg): if self.curindex + 1 != len(self.stack): print >>self.stdout, "*** You can only jump within the bottom frame" return try: arg = int(arg) except ValueError: print >>self.stdout, "*** 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, e: print >>self.stdout, '*** Jump failed:', e do_j = do_jump def do_debug(self, arg): 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() print >>self.stdout, "ENTERING RECURSIVE DEBUGGER" sys.call_tracing(p.run, (arg, globals, locals)) print >>self.stdout, "LEAVING RECURSIVE DEBUGGER" sys.settrace(self.trace_dispatch) self.lastcmd = p.lastcmd def do_quit(self, arg): self._user_requested_quit = 1 self.set_quit() return 1 do_q = do_quit do_exit = do_quit def do_EOF(self, arg): print >>self.stdout self._user_requested_quit = 1 self.set_quit() return 1 def do_args(self, arg): 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] print >>self.stdout, name, '=', if name in dict: print >>self.stdout, dict[name] else: print >>self.stdout, "*** undefined ***" do_a = do_args def do_retval(self, arg): if '__return__' in self.curframe_locals: print >>self.stdout, self.curframe_locals['__return__'] else: print >>self.stdout, '*** Not yet returned!' do_rv = do_retval def _getval(self, arg): try: return eval(arg, self.curframe.f_globals, self.curframe_locals) except: t, v = sys.exc_info()[:2] if isinstance(t, str): exc_type_name = t else: exc_type_name = t.__name__ print >>self.stdout, '***', exc_type_name + ':', repr(v) raise def do_p(self, arg): try: print >>self.stdout, repr(self._getval(arg)) except: pass def do_pp(self, arg): try: pprint.pprint(self._getval(arg), self.stdout) except: pass def do_list(self, arg): self.lastcmd = 'list' last = None if arg: try: x = eval(arg, {}, {}) if type(x) == type(()): first, last = x first = int(first) last = int(last) if last < first: # Assume it's a count last = first + last else: first = max(1, int(x) - 5) except: print >>self.stdout, '*** Error in argument:', repr(arg) return elif self.lineno is None: first = max(1, self.curframe.f_lineno - 5) else: first = self.lineno + 1 if last is None: last = first + 10 filename = self.curframe.f_code.co_filename breaklist = self.get_file_breaks(filename) try: for lineno in range(first, last+1): line = linecache.getline(filename, lineno, self.curframe.f_globals) if not line: print >>self.stdout, '[EOF]' break else: s = repr(lineno).rjust(3) if len(s) < 4: s = s + ' ' if lineno in breaklist: s = s + 'B' else: s = s + ' ' if lineno == self.curframe.f_lineno: s = s + '->' print >>self.stdout, s + '\t' + line, self.lineno = lineno except KeyboardInterrupt: pass do_l = do_list def do_whatis(self, arg): try: value = eval(arg, self.curframe.f_globals, self.curframe_locals) except: t, v = sys.exc_info()[:2] if type(t) == type(''): exc_type_name = t else: exc_type_name = t.__name__ print >>self.stdout, '***', exc_type_name + ':', repr(v) return code = None # Is it a function? try: code = value.func_code except: pass if code: print >>self.stdout, 'Function', code.co_name return # Is it an instance method? try: code = value.im_func.func_code except: pass if code: print >>self.stdout, 'Method', code.co_name return # None of the above... print >>self.stdout, type(value) def do_alias(self, arg): args = arg.split() if len(args) == 0: keys = self.aliases.keys() keys.sort() for alias in keys: print >>self.stdout, "%s = %s" % (alias, self.aliases[alias]) return if args[0] in self.aliases and len(args) == 1: print >>self.stdout, "%s = %s" % (args[0], self.aliases[args[0]]) else: self.aliases[args[0]] = ' '.join(args[1:]) def do_unalias(self, arg): 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: print >>self.stdout, '>', else: print >>self.stdout, ' ', print >>self.stdout, self.format_stack_entry(frame_lineno, prompt_prefix) # Help methods (derived from pdb.doc) def help_help(self): self.help_h() def help_h(self): print >>self.stdout, """h(elp) Without argument, print the list of available commands. With a command name as argument, print help about that command "help pdb" pipes the full documentation file to the $PAGER "help exec" gives help on the ! command""" def help_where(self): self.help_w() def help_w(self): print >>self.stdout, """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.""" help_bt = help_w def help_down(self): self.help_d() def help_d(self): print >>self.stdout, """d(own) Move the current frame one level down in the stack trace (to a newer frame).""" def help_up(self): self.help_u() def help_u(self): print >>self.stdout, """u(p) Move the current frame one level up in the stack trace (to an older frame).""" def help_break(self): self.help_b() def help_b(self): print >>self.stdout, """b(reak) ([file:]lineno | function) [, condition] With a line number argument, set a break there in the current file. With a function name, set a break at first executable line of that function. Without argument, list all breaks. If a second argument is present, it is a string specifying an expression which must evaluate to true before the breakpoint is honored. The line number may be prefixed with a filename and a colon, to specify a breakpoint in another file (probably one that hasn't been loaded yet). The file is searched for on sys.path; the .py suffix may be omitted.""" def help_clear(self): self.help_cl() def help_cl(self): print >>self.stdout, "cl(ear) filename:lineno" print >>self.stdout, """cl(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. Note that the argument is different from previous versions of the debugger (in python distributions 1.5.1 and before) where a linenumber was used instead of either filename:lineno or breakpoint numbers.""" def help_tbreak(self): print >>self.stdout, """tbreak same arguments as break, but breakpoint is removed when first hit.""" def help_enable(self): print >>self.stdout, """enable bpnumber [bpnumber ...] Enables the breakpoints given as a space separated list of bp numbers.""" def help_disable(self): print >>self.stdout, """disable bpnumber [bpnumber ...] Disables the breakpoints given as a space separated list of bp numbers.""" def help_ignore(self): print >>self.stdout, """ignore bpnumber count Sets the ignore count for the given breakpoint number. 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.""" def help_condition(self): print >>self.stdout, """condition bpnumber str_condition str_condition is a string specifying an expression which must evaluate to true before the breakpoint is honored. If str_condition is absent, any existing condition is removed; i.e., the breakpoint is made unconditional.""" def help_step(self): self.help_s() def help_s(self): print >>self.stdout, """s(tep) Execute the current line, stop at the first possible occasion (either in a function that is called or in the current function).""" def help_until(self): self.help_unt() def help_unt(self): print """unt(il) Continue execution until the line with a number greater than the current one is reached or until the current frame returns""" def help_next(self): self.help_n() def help_n(self): print >>self.stdout, """n(ext) Continue execution until the next line in the current function is reached or it returns.""" def help_return(self): self.help_r() def help_r(self): print >>self.stdout, """r(eturn) Continue execution until the current function returns.""" def help_continue(self): self.help_c() def help_cont(self): self.help_c() def help_c(self): print >>self.stdout, """c(ont(inue)) Continue execution, only stop when a breakpoint is encountered.""" def help_jump(self): self.help_j() def help_j(self): print >>self.stdout, """j(ump) lineno Set the next line that will be executed.""" def help_debug(self): print >>self.stdout, """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).""" def help_list(self): self.help_l() def help_l(self): print >>self.stdout, """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 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.""" def help_args(self): self.help_a() def help_a(self): print >>self.stdout, """a(rgs) Print the arguments of the current function.""" def help_p(self): print >>self.stdout, """p expression Print the value of the expression.""" def help_pp(self): print >>self.stdout, """pp expression Pretty-print the value of the expression.""" def help_exec(self): print >>self.stdout, """(!) 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)""" def help_run(self): print """run [args...] Restart the debugged python program. If a string is supplied, it is split 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".""" help_restart = help_run def help_quit(self): self.help_q() def help_q(self): print >>self.stdout, """q(uit) or exit - Quit from the debugger. The program being executed is aborted.""" help_exit = help_q def help_whatis(self): print >>self.stdout, """whatis arg Prints the type of the argument.""" def help_EOF(self): print >>self.stdout, """EOF Handles the receipt of EOF as a command.""" def help_alias(self): print >>self.stdout, """alias [name [command [parameter parameter ...]]] Creates an alias called 'name' the executes 'command'. The command must *not* be enclosed in quotes. Replaceable parameters are 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. Some useful aliases (especially when placed in the .pdbrc file) are: #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 """ def help_unalias(self): print >>self.stdout, """unalias name Deletes the specified alias.""" def help_commands(self): print >>self.stdout, """commands [bpnumber] (com) ... (com) end (Pdb) Specify a list of commands for breakpoint number bpnumber. The commands themselves appear on the following lines. Type a line containing just 'end' to terminate the commands. To remove all commands from a breakpoint, type commands and follow it immediately with end; that is, give no commands. With no bpnumber argument, commands refers to the last breakpoint set. You can use breakpoint commands to start your program up again. Simply use the continue command, or step, or any other command that resumes execution. Specifying any command resuming execution (currently continue, step, next, return, jump, quit and their abbreviations) terminates the command list (as if that command was immediately followed by end). This is because any time you resume execution (even with a simple next or step), you may encounter another breakpoint--which could have its own command list, leading to ambiguities about which list to execute. If you use the 'silent' command in the command list, the usual message about stopping at a breakpoint is not printed. This may be desirable for breakpoints that are to print a specific message and then continue. If none of the other commands print anything, you see no sign that the breakpoint was reached. """ def help_pdb(self): help() 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 statement = 'execfile(%r)' % filename self.run(statement) # 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(): for dirname in sys.path: fullname = os.path.join(dirname, 'pdb.doc') if os.path.exists(fullname): sts = os.system('${PAGER-more} '+fullname) if sts: print '*** Pager exit status:', sts break else: print 'Sorry, can\'t find the help file "pdb.doc"', print 'along the Python search path' def main(): if not sys.argv[1:] or sys.argv[1] in ("--help", "-h"): print "usage: pdb.py scriptfile [arg] ..." sys.exit(2) mainpyfile = sys.argv[1] # Get script filename if not os.path.exists(mainpyfile): print 'Error:', mainpyfile, 'does not exist' sys.exit(1) del sys.argv[0] # Hide "pdb.py" 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() 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(sys.argv[1:]) except SystemExit: # In most cases SystemExit does not warrant a post-mortem session. print "The program exited via sys.exit(). Exit status: ", print sys.exc_info()[1] except SyntaxError: traceback.print_exc() sys.exit(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()
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