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