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555 lines
14 KiB
Python
555 lines
14 KiB
Python
# Debugger basics
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import sys
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import types
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BdbQuit = 'bdb.BdbQuit' # Exception to give up completely
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class Bdb:
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"""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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The standard debugger class (pdb.Pdb) is an example.
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"""
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def __init__(self):
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self.breaks = {}
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# We want to have a method self.canonic() which
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# canonicalizes filenames before comparing them
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# but we want the default to be a very fast no-op.
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# Solution: the built-in str function.
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if not hasattr(self, "canonic"):
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self.canonic = str
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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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# XXX 'arg' is no longer used
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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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filename = self.canonic(frame.f_code.co_filename)
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if not self.breaks.has_key(filename):
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return 0
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lineno = frame.f_lineno
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if not lineno in self.breaks[filename]:
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return 0
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# flag says ok to delete temp. bp
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(bp, flag) = effective(filename, lineno, frame)
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if bp:
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self.currentbp = bp.number
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if (flag and bp.temporary):
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self.do_clear(str(bp.number))
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return 1
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else:
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return 0
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def break_anywhere(self, frame):
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return self.breaks.has_key(
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self.canonic(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_info()[2].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_info()[2].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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# Set_break prints out the breakpoint line and file:lineno.
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# Call self.get_*break*() to see the breakpoints or better
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# for bp in Breakpoint.bpbynumber: if bp: bp.bpprint().
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def set_break(self, filename, lineno, temporary=0, cond = None):
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filename = self.canonic(filename)
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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 'Line %s:%d does not exist' % (filename,
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lineno)
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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 not lineno in list:
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list.append(lineno)
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bp = Breakpoint(filename, lineno, temporary, cond)
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def clear_break(self, filename, lineno):
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filename = self.canonic(filename)
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if not self.breaks.has_key(filename):
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return 'There are no breakpoints in %s' % filename
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if lineno not in self.breaks[filename]:
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return 'There is no breakpoint at %s:%d' % (filename,
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lineno)
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# If there's only one bp in the list for that file,line
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# pair, then remove the breaks entry
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for bp in Breakpoint.bplist[filename, lineno][:]:
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bp.deleteMe()
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if not Breakpoint.bplist.has_key((filename, lineno)):
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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_bpbynumber(self, arg):
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try:
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number = int(arg)
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except:
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return 'Non-numeric breakpoint number (%s)' % arg
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try:
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bp = Breakpoint.bpbynumber[number]
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except IndexError:
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return 'Breakpoint number (%d) out of range' % number
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if not bp:
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return 'Breakpoint (%d) already deleted' % number
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self.clear_break(bp.file, bp.line)
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def clear_all_file_breaks(self, filename):
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filename = self.canonic(filename)
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if not self.breaks.has_key(filename):
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return 'There are no breakpoints in %s' % filename
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for line in self.breaks[filename]:
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blist = Breakpoint.bplist[filename, line]
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for bp in blist:
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bp.deleteMe()
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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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for bp in Breakpoint.bpbynumber:
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if bp:
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bp.deleteMe()
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self.breaks = {}
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def get_break(self, filename, lineno):
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filename = self.canonic(filename)
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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_breaks(self, filename, lineno):
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filename = self.canonic(filename)
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return self.breaks.has_key(filename) and \
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lineno in self.breaks[filename] and \
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Breakpoint.bplist[filename, lineno] or []
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def get_file_breaks(self, filename):
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filename = self.canonic(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 = self.canonic(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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else:
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args = None
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if args:
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s = s + repr.repr(args)
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else:
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s = s + '()'
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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, globals=None, locals=None):
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if globals is None:
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import __main__
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globals = __main__.__dict__
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if locals is None:
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locals = globals
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self.reset()
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sys.settrace(self.trace_dispatch)
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if type(cmd) <> types.CodeType:
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cmd = cmd+'\n'
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try:
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try:
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exec cmd in 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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def runeval(self, expr, globals=None, locals=None):
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if globals is None:
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import __main__
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globals = __main__.__dict__
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if locals is None:
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locals = globals
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self.reset()
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sys.settrace(self.trace_dispatch)
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if type(expr) <> types.CodeType:
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expr = expr+'\n'
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try:
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try:
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return eval(expr, 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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def runctx(self, cmd, globals, locals):
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# B/W compatibility
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self.run(cmd, globals, locals)
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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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res = None
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try:
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try:
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res = 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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return res
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def set_trace():
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Bdb().set_trace()
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class Breakpoint:
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"""Breakpoint class
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Implements temporary breakpoints, ignore counts, disabling and
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(re)-enabling, and conditionals.
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Breakpoints are indexed by number through bpbynumber and by
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the file,line tuple using bplist. The former points to a
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single instance of class Breakpoint. The latter points to a
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list of such instances since there may be more than one
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breakpoint per line.
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"""
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# XXX Keeping state in the class is a mistake -- this means
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# you cannot have more than one active Bdb instance.
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next = 1 # Next bp to be assigned
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bplist = {} # indexed by (file, lineno) tuple
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bpbynumber = [None] # Each entry is None or an instance of Bpt
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# index 0 is unused, except for marking an
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# effective break .... see effective()
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def __init__(self, file, line, temporary=0, cond = None):
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self.file = file # This better be in canonical form!
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self.line = line
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self.temporary = temporary
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self.cond = cond
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self.enabled = 1
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self.ignore = 0
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self.hits = 0
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self.number = Breakpoint.next
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Breakpoint.next = Breakpoint.next + 1
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# Build the two lists
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self.bpbynumber.append(self)
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if self.bplist.has_key((file, line)):
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self.bplist[file, line].append(self)
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else:
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self.bplist[file, line] = [self]
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def deleteMe(self):
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index = (self.file, self.line)
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self.bpbynumber[self.number] = None # No longer in list
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self.bplist[index].remove(self)
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if not self.bplist[index]:
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# No more bp for this f:l combo
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del self.bplist[index]
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def enable(self):
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self.enabled = 1
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def disable(self):
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self.enabled = 0
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def bpprint(self):
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if self.temporary:
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disp = 'del '
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else:
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disp = 'keep '
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if self.enabled:
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disp = disp + 'yes'
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else:
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disp = disp + 'no '
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print '%-4dbreakpoint %s at %s:%d' % (self.number, disp,
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self.file, self.line)
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if self.cond:
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print '\tstop only if %s' % (self.cond,)
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if self.ignore:
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print '\tignore next %d hits' % (self.ignore)
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if (self.hits):
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if (self.hits > 1): ss = 's'
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else: ss = ''
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print ('\tbreakpoint already hit %d time%s' %
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(self.hits, ss))
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# -----------end of Breakpoint class----------
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# Determines if there is an effective (active) breakpoint at this
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# line of code. Returns breakpoint number or 0 if none
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def effective(file, line, frame):
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"""Determine which breakpoint for this file:line is to be acted upon.
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Called only if we know there is a bpt at this
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location. Returns breakpoint that was triggered and a flag
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that indicates if it is ok to delete a temporary bp.
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"""
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possibles = Breakpoint.bplist[file,line]
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for i in range(0, len(possibles)):
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b = possibles[i]
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if b.enabled == 0:
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continue
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# Count every hit when bp is enabled
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b.hits = b.hits + 1
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if not b.cond:
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# If unconditional, and ignoring,
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# go on to next, else break
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if b.ignore > 0:
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b.ignore = b.ignore -1
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continue
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else:
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# breakpoint and marker that's ok
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# to delete if temporary
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return (b,1)
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else:
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# Conditional bp.
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# Ignore count applies only to those bpt hits where the
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# condition evaluates to true.
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try:
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val = eval(b.cond, frame.f_globals,
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frame.f_locals)
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if val:
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if b.ignore > 0:
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b.ignore = b.ignore -1
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# continue
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else:
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return (b,1)
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# else:
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# continue
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except:
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# if eval fails, most conservative
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# thing is to stop on breakpoint
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# regardless of ignore count.
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# Don't delete temporary,
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# as another hint to user.
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return (b,0)
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return (None, None)
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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 = self.canonic(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):
|
|
print '+++ exception', exc_stuff
|
|
self.set_continue()
|
|
|
|
def foo(n):
|
|
print 'foo(', n, ')'
|
|
x = bar(n*10)
|
|
print 'bar returned', x
|
|
|
|
def bar(a):
|
|
print 'bar(', a, ')'
|
|
return a/2
|
|
|
|
def test():
|
|
t = Tdb()
|
|
t.run('import bdb; bdb.foo(10)')
|