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| """Debugger basics""" | |
| import fnmatch | |
| import sys | |
| import os | |
| from inspect import CO_GENERATOR, CO_COROUTINE, CO_ASYNC_GENERATOR | |
| __all__ = ["BdbQuit", "Bdb", "Breakpoint"] | |
| GENERATOR_AND_COROUTINE_FLAGS = CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR | |
| class BdbQuit(Exception): | |
| """Exception to give up completely.""" | |
| class Bdb: | |
| """Generic Python debugger base class. | |
| This class takes care of details of the trace facility; | |
| a derived class should implement user interaction. | |
| The standard debugger class (pdb.Pdb) is an example. | |
| The optional skip argument must be an iterable of glob-style | |
| module name patterns. The debugger will not step into frames | |
| that originate in a module that matches one of these patterns. | |
| Whether a frame is considered to originate in a certain module | |
| is determined by the __name__ in the frame globals. | |
| """ | |
| def __init__(self, skip=None): | |
| self.skip = set(skip) if skip else None | |
| self.breaks = {} | |
| self.fncache = {} | |
| self.frame_returning = None | |
| self._load_breaks() | |
| def canonic(self, filename): | |
| """Return canonical form of filename. | |
| For real filenames, the canonical form is a case-normalized (on | |
| case insensitive filesystems) absolute path. 'Filenames' with | |
| angle brackets, such as "<stdin>", generated in interactive | |
| mode, are returned unchanged. | |
| """ | |
| if filename == "<" + filename[1:-1] + ">": | |
| return filename | |
| canonic = self.fncache.get(filename) | |
| if not canonic: | |
| canonic = os.path.abspath(filename) | |
| canonic = os.path.normcase(canonic) | |
| self.fncache[filename] = canonic | |
| return canonic | |
| def reset(self): | |
| """Set values of attributes as ready to start debugging.""" | |
| import linecache | |
| linecache.checkcache() | |
| self.botframe = None | |
| self._set_stopinfo(None, None) | |
| def trace_dispatch(self, frame, event, arg): | |
| """Dispatch a trace function for debugged frames based on the event. | |
| This function is installed as the trace function for debugged | |
| frames. Its return value is the new trace function, which is | |
| usually itself. The default implementation decides how to | |
| dispatch a frame, depending on the type of event (passed in as a | |
| string) that is about to be executed. | |
| The event can be one of the following: | |
| line: A new line of code is going to be executed. | |
| call: A function is about to be called or another code block | |
| is entered. | |
| return: A function or other code block is about to return. | |
| exception: An exception has occurred. | |
| c_call: A C function is about to be called. | |
| c_return: A C function has returned. | |
| c_exception: A C function has raised an exception. | |
| For the Python events, specialized functions (see the dispatch_*() | |
| methods) are called. For the C events, no action is taken. | |
| The arg parameter depends on the previous event. | |
| """ | |
| if self.quitting: | |
| return # None | |
| if event == 'line': | |
| return self.dispatch_line(frame) | |
| if event == 'call': | |
| return self.dispatch_call(frame, arg) | |
| if event == 'return': | |
| return self.dispatch_return(frame, arg) | |
| if event == 'exception': | |
| return self.dispatch_exception(frame, arg) | |
| if event == 'c_call': | |
| return self.trace_dispatch | |
| if event == 'c_exception': | |
| return self.trace_dispatch | |
| if event == 'c_return': | |
| return self.trace_dispatch | |
| print('bdb.Bdb.dispatch: unknown debugging event:', repr(event)) | |
| return self.trace_dispatch | |
| def dispatch_line(self, frame): | |
| """Invoke user function and return trace function for line event. | |
| If the debugger stops on the current line, invoke | |
| self.user_line(). Raise BdbQuit if self.quitting is set. | |
| Return self.trace_dispatch to continue tracing in this scope. | |
| """ | |
| if self.stop_here(frame) or self.break_here(frame): | |
| self.user_line(frame) | |
| if self.quitting: raise BdbQuit | |
| return self.trace_dispatch | |
| def dispatch_call(self, frame, arg): | |
| """Invoke user function and return trace function for call event. | |
| If the debugger stops on this function call, invoke | |
| self.user_call(). Raise BdbQuit if self.quitting is set. | |
| Return self.trace_dispatch to continue tracing in this scope. | |
| """ | |
| # XXX 'arg' is no longer used | |
| if self.botframe is None: | |
| # First call of dispatch since reset() | |
| self.botframe = frame.f_back # (CT) Note that this may also be None! | |
| return self.trace_dispatch | |
| if not (self.stop_here(frame) or self.break_anywhere(frame)): | |
| # No need to trace this function | |
| return # None | |
| # Ignore call events in generator except when stepping. | |
| if self.stopframe and frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS: | |
| return self.trace_dispatch | |
| self.user_call(frame, arg) | |
| if self.quitting: raise BdbQuit | |
| return self.trace_dispatch | |
| def dispatch_return(self, frame, arg): | |
| """Invoke user function and return trace function for return event. | |
| If the debugger stops on this function return, invoke | |
| self.user_return(). Raise BdbQuit if self.quitting is set. | |
| Return self.trace_dispatch to continue tracing in this scope. | |
| """ | |
| if self.stop_here(frame) or frame == self.returnframe: | |
| # Ignore return events in generator except when stepping. | |
| if self.stopframe and frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS: | |
| return self.trace_dispatch | |
| try: | |
| self.frame_returning = frame | |
| self.user_return(frame, arg) | |
| finally: | |
| self.frame_returning = None | |
| if self.quitting: raise BdbQuit | |
| # The user issued a 'next' or 'until' command. | |
| if self.stopframe is frame and self.stoplineno != -1: | |
| self._set_stopinfo(None, None) | |
| return self.trace_dispatch | |
| def dispatch_exception(self, frame, arg): | |
| """Invoke user function and return trace function for exception event. | |
| If the debugger stops on this exception, invoke | |
| self.user_exception(). Raise BdbQuit if self.quitting is set. | |
| Return self.trace_dispatch to continue tracing in this scope. | |
| """ | |
| if self.stop_here(frame): | |
| # When stepping with next/until/return in a generator frame, skip | |
| # the internal StopIteration exception (with no traceback) | |
| # triggered by a subiterator run with the 'yield from' statement. | |
| if not (frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS | |
| and arg[0] is StopIteration and arg[2] is None): | |
| self.user_exception(frame, arg) | |
| if self.quitting: raise BdbQuit | |
| # Stop at the StopIteration or GeneratorExit exception when the user | |
| # has set stopframe in a generator by issuing a return command, or a | |
| # next/until command at the last statement in the generator before the | |
| # exception. | |
| elif (self.stopframe and frame is not self.stopframe | |
| and self.stopframe.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS | |
| and arg[0] in (StopIteration, GeneratorExit)): | |
| self.user_exception(frame, arg) | |
| if self.quitting: raise BdbQuit | |
| return self.trace_dispatch | |
| # Normally derived classes don't override the following | |
| # methods, but they may if they want to redefine the | |
| # definition of stopping and breakpoints. | |
| def is_skipped_module(self, module_name): | |
| "Return True if module_name matches any skip pattern." | |
| if module_name is None: # some modules do not have names | |
| return False | |
| for pattern in self.skip: | |
| if fnmatch.fnmatch(module_name, pattern): | |
| return True | |
| return False | |
| def stop_here(self, frame): | |
| "Return True if frame is below the starting frame in the stack." | |
| # (CT) stopframe may now also be None, see dispatch_call. | |
| # (CT) the former test for None is therefore removed from here. | |
| if self.skip and \ | |
| self.is_skipped_module(frame.f_globals.get('__name__')): | |
| return False | |
| if frame is self.stopframe: | |
| if self.stoplineno == -1: | |
| return False | |
| return frame.f_lineno >= self.stoplineno | |
| if not self.stopframe: | |
| return True | |
| return False | |
| def break_here(self, frame): | |
| """Return True if there is an effective breakpoint for this line. | |
| Check for line or function breakpoint and if in effect. | |
| Delete temporary breakpoints if effective() says to. | |
| """ | |
| filename = self.canonic(frame.f_code.co_filename) | |
| if filename not in self.breaks: | |
| return False | |
| lineno = frame.f_lineno | |
| if lineno not in self.breaks[filename]: | |
| # The line itself has no breakpoint, but maybe the line is the | |
| # first line of a function with breakpoint set by function name. | |
| lineno = frame.f_code.co_firstlineno | |
| if lineno not in self.breaks[filename]: | |
| return False | |
| # flag says ok to delete temp. bp | |
| (bp, flag) = effective(filename, lineno, frame) | |
| if bp: | |
| self.currentbp = bp.number | |
| if (flag and bp.temporary): | |
| self.do_clear(str(bp.number)) | |
| return True | |
| else: | |
| return False | |
| def do_clear(self, arg): | |
| """Remove temporary breakpoint. | |
| Must implement in derived classes or get NotImplementedError. | |
| """ | |
| raise NotImplementedError("subclass of bdb must implement do_clear()") | |
| def break_anywhere(self, frame): | |
| """Return True if there is any breakpoint for frame's filename. | |
| """ | |
| return self.canonic(frame.f_code.co_filename) in self.breaks | |
| # Derived classes should override the user_* methods | |
| # to gain control. | |
| def user_call(self, frame, argument_list): | |
| """Called if we might stop in a function.""" | |
| pass | |
| def user_line(self, frame): | |
| """Called when we stop or break at a line.""" | |
| pass | |
| def user_return(self, frame, return_value): | |
| """Called when a return trap is set here.""" | |
| pass | |
| def user_exception(self, frame, exc_info): | |
| """Called when we stop on an exception.""" | |
| pass | |
| def _set_stopinfo(self, stopframe, returnframe, stoplineno=0): | |
| """Set the attributes for stopping. | |
| If stoplineno is greater than or equal to 0, then stop at line | |
| greater than or equal to the stopline. If stoplineno is -1, then | |
| don't stop at all. | |
| """ | |
| self.stopframe = stopframe | |
| self.returnframe = returnframe | |
| self.quitting = False | |
| # stoplineno >= 0 means: stop at line >= the stoplineno | |
| # stoplineno -1 means: don't stop at all | |
| self.stoplineno = stoplineno | |
| # Derived classes and clients can call the following methods | |
| # to affect the stepping state. | |
| def set_until(self, frame, lineno=None): | |
| """Stop when the line with the lineno greater than the current one is | |
| reached or when returning from current frame.""" | |
| # the name "until" is borrowed from gdb | |
| if lineno is None: | |
| lineno = frame.f_lineno + 1 | |
| self._set_stopinfo(frame, frame, lineno) | |
| def set_step(self): | |
| """Stop after one line of code.""" | |
| # Issue #13183: pdb skips frames after hitting a breakpoint and running | |
| # step commands. | |
| # Restore the trace function in the caller (that may not have been set | |
| # for performance reasons) when returning from the current frame. | |
| if self.frame_returning: | |
| caller_frame = self.frame_returning.f_back | |
| if caller_frame and not caller_frame.f_trace: | |
| caller_frame.f_trace = self.trace_dispatch | |
| self._set_stopinfo(None, None) | |
| def set_next(self, frame): | |
| """Stop on the next line in or below the given frame.""" | |
| self._set_stopinfo(frame, None) | |
| def set_return(self, frame): | |
| """Stop when returning from the given frame.""" | |
| if frame.f_code.co_flags & GENERATOR_AND_COROUTINE_FLAGS: | |
| self._set_stopinfo(frame, None, -1) | |
| else: | |
| self._set_stopinfo(frame.f_back, frame) | |
| def set_trace(self, frame=None): | |
| """Start debugging from frame. | |
| If frame is not specified, debugging starts from caller's frame. | |
| """ | |
| if frame is None: | |
| frame = sys._getframe().f_back | |
| self.reset() | |
| while frame: | |
| frame.f_trace = self.trace_dispatch | |
| self.botframe = frame | |
| frame = frame.f_back | |
| self.set_step() | |
| sys.settrace(self.trace_dispatch) | |
| def set_continue(self): | |
| """Stop only at breakpoints or when finished. | |
| If there are no breakpoints, set the system trace function to None. | |
| """ | |
| # Don't stop except at breakpoints or when finished | |
| self._set_stopinfo(self.botframe, None, -1) | |
| if not self.breaks: | |
| # no breakpoints; run without debugger overhead | |
| sys.settrace(None) | |
| frame = sys._getframe().f_back | |
| while frame and frame is not self.botframe: | |
| del frame.f_trace | |
| frame = frame.f_back | |
| def set_quit(self): | |
| """Set quitting attribute to True. | |
| Raises BdbQuit exception in the next call to a dispatch_*() method. | |
| """ | |
| self.stopframe = self.botframe | |
| self.returnframe = None | |
| self.quitting = True | |
| sys.settrace(None) | |
| # Derived classes and clients can call the following methods | |
| # to manipulate breakpoints. These methods return an | |
| # error message if something went wrong, None if all is well. | |
| # Set_break prints out the breakpoint line and file:lineno. | |
| # Call self.get_*break*() to see the breakpoints or better | |
| # for bp in Breakpoint.bpbynumber: if bp: bp.bpprint(). | |
| def _add_to_breaks(self, filename, lineno): | |
| """Add breakpoint to breaks, if not already there.""" | |
| bp_linenos = self.breaks.setdefault(filename, []) | |
| if lineno not in bp_linenos: | |
| bp_linenos.append(lineno) | |
| def set_break(self, filename, lineno, temporary=False, cond=None, | |
| funcname=None): | |
| """Set a new breakpoint for filename:lineno. | |
| If lineno doesn't exist for the filename, return an error message. | |
| The filename should be in canonical form. | |
| """ | |
| filename = self.canonic(filename) | |
| import linecache # Import as late as possible | |
| line = linecache.getline(filename, lineno) | |
| if not line: | |
| return 'Line %s:%d does not exist' % (filename, lineno) | |
| self._add_to_breaks(filename, lineno) | |
| bp = Breakpoint(filename, lineno, temporary, cond, funcname) | |
| return None | |
| def _load_breaks(self): | |
| """Apply all breakpoints (set in other instances) to this one. | |
| Populates this instance's breaks list from the Breakpoint class's | |
| list, which can have breakpoints set by another Bdb instance. This | |
| is necessary for interactive sessions to keep the breakpoints | |
| active across multiple calls to run(). | |
| """ | |
| for (filename, lineno) in Breakpoint.bplist.keys(): | |
| self._add_to_breaks(filename, lineno) | |
| def _prune_breaks(self, filename, lineno): | |
| """Prune breakpoints for filename:lineno. | |
| A list of breakpoints is maintained in the Bdb instance and in | |
| the Breakpoint class. If a breakpoint in the Bdb instance no | |
| longer exists in the Breakpoint class, then it's removed from the | |
| Bdb instance. | |
| """ | |
| if (filename, lineno) not in Breakpoint.bplist: | |
| self.breaks[filename].remove(lineno) | |
| if not self.breaks[filename]: | |
| del self.breaks[filename] | |
| def clear_break(self, filename, lineno): | |
| """Delete breakpoints for filename:lineno. | |
| If no breakpoints were set, return an error message. | |
| """ | |
| filename = self.canonic(filename) | |
| if filename not in self.breaks: | |
| return 'There are no breakpoints in %s' % filename | |
| if lineno not in self.breaks[filename]: | |
| return 'There is no breakpoint at %s:%d' % (filename, lineno) | |
| # If there's only one bp in the list for that file,line | |
| # pair, then remove the breaks entry | |
| for bp in Breakpoint.bplist[filename, lineno][:]: | |
| bp.deleteMe() | |
| self._prune_breaks(filename, lineno) | |
| return None | |
| def clear_bpbynumber(self, arg): | |
| """Delete a breakpoint by its index in Breakpoint.bpbynumber. | |
| If arg is invalid, return an error message. | |
| """ | |
| try: | |
| bp = self.get_bpbynumber(arg) | |
| except ValueError as err: | |
| return str(err) | |
| bp.deleteMe() | |
| self._prune_breaks(bp.file, bp.line) | |
| return None | |
| def clear_all_file_breaks(self, filename): | |
| """Delete all breakpoints in filename. | |
| If none were set, return an error message. | |
| """ | |
| filename = self.canonic(filename) | |
| if filename not in self.breaks: | |
| return 'There are no breakpoints in %s' % filename | |
| for line in self.breaks[filename]: | |
| blist = Breakpoint.bplist[filename, line] | |
| for bp in blist: | |
| bp.deleteMe() | |
| del self.breaks[filename] | |
| return None | |
| def clear_all_breaks(self): | |
| """Delete all existing breakpoints. | |
| If none were set, return an error message. | |
| """ | |
| if not self.breaks: | |
| return 'There are no breakpoints' | |
| for bp in Breakpoint.bpbynumber: | |
| if bp: | |
| bp.deleteMe() | |
| self.breaks = {} | |
| return None | |
| def get_bpbynumber(self, arg): | |
| """Return a breakpoint by its index in Breakpoint.bybpnumber. | |
| For invalid arg values or if the breakpoint doesn't exist, | |
| raise a ValueError. | |
| """ | |
| if not arg: | |
| raise ValueError('Breakpoint number expected') | |
| try: | |
| number = int(arg) | |
| except ValueError: | |
| raise ValueError('Non-numeric breakpoint number %s' % arg) from None | |
| try: | |
| bp = Breakpoint.bpbynumber[number] | |
| except IndexError: | |
| raise ValueError('Breakpoint number %d out of range' % number) from None | |
| if bp is None: | |
| raise ValueError('Breakpoint %d already deleted' % number) | |
| return bp | |
| def get_break(self, filename, lineno): | |
| """Return True if there is a breakpoint for filename:lineno.""" | |
| filename = self.canonic(filename) | |
| return filename in self.breaks and \ | |
| lineno in self.breaks[filename] | |
| def get_breaks(self, filename, lineno): | |
| """Return all breakpoints for filename:lineno. | |
| If no breakpoints are set, return an empty list. | |
| """ | |
| filename = self.canonic(filename) | |
| return filename in self.breaks and \ | |
| lineno in self.breaks[filename] and \ | |
| Breakpoint.bplist[filename, lineno] or [] | |
| def get_file_breaks(self, filename): | |
| """Return all lines with breakpoints for filename. | |
| If no breakpoints are set, return an empty list. | |
| """ | |
| filename = self.canonic(filename) | |
| if filename in self.breaks: | |
| return self.breaks[filename] | |
| else: | |
| return [] | |
| def get_all_breaks(self): | |
| """Return all breakpoints that are set.""" | |
| return self.breaks | |
| # Derived classes and clients can call the following method | |
| # to get a data structure representing a stack trace. | |
| def get_stack(self, f, t): | |
| """Return a list of (frame, lineno) in a stack trace and a size. | |
| List starts with original calling frame, if there is one. | |
| Size may be number of frames above or below f. | |
| """ | |
| stack = [] | |
| if t and t.tb_frame is f: | |
| t = t.tb_next | |
| while f is not None: | |
| stack.append((f, f.f_lineno)) | |
| if f is self.botframe: | |
| break | |
| f = f.f_back | |
| stack.reverse() | |
| i = max(0, len(stack) - 1) | |
| while t is not None: | |
| stack.append((t.tb_frame, t.tb_lineno)) | |
| t = t.tb_next | |
| if f is None: | |
| i = max(0, len(stack) - 1) | |
| return stack, i | |
| def format_stack_entry(self, frame_lineno, lprefix=': '): | |
| """Return a string with information about a stack entry. | |
| The stack entry frame_lineno is a (frame, lineno) tuple. The | |
| return string contains the canonical filename, the function name | |
| or '<lambda>', the input arguments, the return value, and the | |
| line of code (if it exists). | |
| """ | |
| import linecache, reprlib | |
| frame, lineno = frame_lineno | |
| filename = self.canonic(frame.f_code.co_filename) | |
| s = '%s(%r)' % (filename, lineno) | |
| if frame.f_code.co_name: | |
| s += frame.f_code.co_name | |
| else: | |
| s += "<lambda>" | |
| s += '()' | |
| if '__return__' in frame.f_locals: | |
| rv = frame.f_locals['__return__'] | |
| s += '->' | |
| s += reprlib.repr(rv) | |
| line = linecache.getline(filename, lineno, frame.f_globals) | |
| if line: | |
| s += lprefix + line.strip() | |
| return s | |
| # The following methods can be called by clients to use | |
| # a debugger to debug a statement or an expression. | |
| # Both can be given as a string, or a code object. | |
| def run(self, cmd, globals=None, locals=None): | |
| """Debug a statement executed via the exec() function. | |
| globals defaults to __main__.dict; locals defaults to globals. | |
| """ | |
| if globals is None: | |
| import __main__ | |
| globals = __main__.__dict__ | |
| if locals is None: | |
| locals = globals | |
| self.reset() | |
| if isinstance(cmd, str): | |
| cmd = compile(cmd, "<string>", "exec") | |
| sys.settrace(self.trace_dispatch) | |
| try: | |
| exec(cmd, globals, locals) | |
| except BdbQuit: | |
| pass | |
| finally: | |
| self.quitting = True | |
| sys.settrace(None) | |
| def runeval(self, expr, globals=None, locals=None): | |
| """Debug an expression executed via the eval() function. | |
| globals defaults to __main__.dict; locals defaults to globals. | |
| """ | |
| if globals is None: | |
| import __main__ | |
| globals = __main__.__dict__ | |
| if locals is None: | |
| locals = globals | |
| self.reset() | |
| sys.settrace(self.trace_dispatch) | |
| try: | |
| return eval(expr, globals, locals) | |
| except BdbQuit: | |
| pass | |
| finally: | |
| self.quitting = True | |
| sys.settrace(None) | |
| def runctx(self, cmd, globals, locals): | |
| """For backwards-compatibility. Defers to run().""" | |
| # B/W compatibility | |
| self.run(cmd, globals, locals) | |
| # This method is more useful to debug a single function call. | |
| def runcall(self, func, /, *args, **kwds): | |
| """Debug a single function call. | |
| Return the result of the function call. | |
| """ | |
| self.reset() | |
| sys.settrace(self.trace_dispatch) | |
| res = None | |
| try: | |
| res = func(*args, **kwds) | |
| except BdbQuit: | |
| pass | |
| finally: | |
| self.quitting = True | |
| sys.settrace(None) | |
| return res | |
| def set_trace(): | |
| """Start debugging with a Bdb instance from the caller's frame.""" | |
| Bdb().set_trace() | |
| class Breakpoint: | |
| """Breakpoint class. | |
| Implements temporary breakpoints, ignore counts, disabling and | |
| (re)-enabling, and conditionals. | |
| Breakpoints are indexed by number through bpbynumber and by | |
| the (file, line) tuple using bplist. The former points to a | |
| single instance of class Breakpoint. The latter points to a | |
| list of such instances since there may be more than one | |
| breakpoint per line. | |
| When creating a breakpoint, its associated filename should be | |
| in canonical form. If funcname is defined, a breakpoint hit will be | |
| counted when the first line of that function is executed. A | |
| conditional breakpoint always counts a hit. | |
| """ | |
| # XXX Keeping state in the class is a mistake -- this means | |
| # you cannot have more than one active Bdb instance. | |
| next = 1 # Next bp to be assigned | |
| bplist = {} # indexed by (file, lineno) tuple | |
| bpbynumber = [None] # Each entry is None or an instance of Bpt | |
| # index 0 is unused, except for marking an | |
| # effective break .... see effective() | |
| def __init__(self, file, line, temporary=False, cond=None, funcname=None): | |
| self.funcname = funcname | |
| # Needed if funcname is not None. | |
| self.func_first_executable_line = None | |
| self.file = file # This better be in canonical form! | |
| self.line = line | |
| self.temporary = temporary | |
| self.cond = cond | |
| self.enabled = True | |
| self.ignore = 0 | |
| self.hits = 0 | |
| self.number = Breakpoint.next | |
| Breakpoint.next += 1 | |
| # Build the two lists | |
| self.bpbynumber.append(self) | |
| if (file, line) in self.bplist: | |
| self.bplist[file, line].append(self) | |
| else: | |
| self.bplist[file, line] = [self] | |
| @staticmethod | |
| def clearBreakpoints(): | |
| Breakpoint.next = 1 | |
| Breakpoint.bplist = {} | |
| Breakpoint.bpbynumber = [None] | |
| def deleteMe(self): | |
| """Delete the breakpoint from the list associated to a file:line. | |
| If it is the last breakpoint in that position, it also deletes | |
| the entry for the file:line. | |
| """ | |
| index = (self.file, self.line) | |
| self.bpbynumber[self.number] = None # No longer in list | |
| self.bplist[index].remove(self) | |
| if not self.bplist[index]: | |
| # No more bp for this f:l combo | |
| del self.bplist[index] | |
| def enable(self): | |
| """Mark the breakpoint as enabled.""" | |
| self.enabled = True | |
| def disable(self): | |
| """Mark the breakpoint as disabled.""" | |
| self.enabled = False | |
| def bpprint(self, out=None): | |
| """Print the output of bpformat(). | |
| The optional out argument directs where the output is sent | |
| and defaults to standard output. | |
| """ | |
| if out is None: | |
| out = sys.stdout | |
| print(self.bpformat(), file=out) | |
| def bpformat(self): | |
| """Return a string with information about the breakpoint. | |
| The information includes the breakpoint number, temporary | |
| status, file:line position, break condition, number of times to | |
| ignore, and number of times hit. | |
| """ | |
| if self.temporary: | |
| disp = 'del ' | |
| else: | |
| disp = 'keep ' | |
| if self.enabled: | |
| disp = disp + 'yes ' | |
| else: | |
| disp = disp + 'no ' | |
| ret = '%-4dbreakpoint %s at %s:%d' % (self.number, disp, | |
| self.file, self.line) | |
| if self.cond: | |
| ret += '\n\tstop only if %s' % (self.cond,) | |
| if self.ignore: | |
| ret += '\n\tignore next %d hits' % (self.ignore,) | |
| if self.hits: | |
| if self.hits > 1: | |
| ss = 's' | |
| else: | |
| ss = '' | |
| ret += '\n\tbreakpoint already hit %d time%s' % (self.hits, ss) | |
| return ret | |
| def __str__(self): | |
| "Return a condensed description of the breakpoint." | |
| return 'breakpoint %s at %s:%s' % (self.number, self.file, self.line) | |
| # -----------end of Breakpoint class---------- | |
| def checkfuncname(b, frame): | |
| """Return True if break should happen here. | |
| Whether a break should happen depends on the way that b (the breakpoint) | |
| was set. If it was set via line number, check if b.line is the same as | |
| the one in the frame. If it was set via function name, check if this is | |
| the right function and if it is on the first executable line. | |
| """ | |
| if not b.funcname: | |
| # Breakpoint was set via line number. | |
| if b.line != frame.f_lineno: | |
| # Breakpoint was set at a line with a def statement and the function | |
| # defined is called: don't break. | |
| return False | |
| return True | |
| # Breakpoint set via function name. | |
| if frame.f_code.co_name != b.funcname: | |
| # It's not a function call, but rather execution of def statement. | |
| return False | |
| # We are in the right frame. | |
| if not b.func_first_executable_line: | |
| # The function is entered for the 1st time. | |
| b.func_first_executable_line = frame.f_lineno | |
| if b.func_first_executable_line != frame.f_lineno: | |
| # But we are not at the first line number: don't break. | |
| return False | |
| return True | |
| def effective(file, line, frame): | |
| """Return (active breakpoint, delete temporary flag) or (None, None) as | |
| breakpoint to act upon. | |
| The "active breakpoint" is the first entry in bplist[line, file] (which | |
| must exist) that is enabled, for which checkfuncname is True, and that | |
| has neither a False condition nor a positive ignore count. The flag, | |
| meaning that a temporary breakpoint should be deleted, is False only | |
| when the condiion cannot be evaluated (in which case, ignore count is | |
| ignored). | |
| If no such entry exists, then (None, None) is returned. | |
| """ | |
| possibles = Breakpoint.bplist[file, line] | |
| for b in possibles: | |
| if not b.enabled: | |
| continue | |
| if not checkfuncname(b, frame): | |
| continue | |
| # Count every hit when bp is enabled | |
| b.hits += 1 | |
| if not b.cond: | |
| # If unconditional, and ignoring go on to next, else break | |
| if b.ignore > 0: | |
| b.ignore -= 1 | |
| continue | |
| else: | |
| # breakpoint and marker that it's ok to delete if temporary | |
| return (b, True) | |
| else: | |
| # Conditional bp. | |
| # Ignore count applies only to those bpt hits where the | |
| # condition evaluates to true. | |
| try: | |
| val = eval(b.cond, frame.f_globals, frame.f_locals) | |
| if val: | |
| if b.ignore > 0: | |
| b.ignore -= 1 | |
| # continue | |
| else: | |
| return (b, True) | |
| # else: | |
| # continue | |
| except: | |
| # if eval fails, most conservative thing is to stop on | |
| # breakpoint regardless of ignore count. Don't delete | |
| # temporary, as another hint to user. | |
| return (b, False) | |
| return (None, None) | |
| # -------------------- testing -------------------- | |
| class Tdb(Bdb): | |
| def user_call(self, frame, args): | |
| name = frame.f_code.co_name | |
| if not name: name = '???' | |
| print('+++ call', name, args) | |
| def user_line(self, frame): | |
| import linecache | |
| name = frame.f_code.co_name | |
| if not name: name = '???' | |
| fn = self.canonic(frame.f_code.co_filename) | |
| line = linecache.getline(fn, frame.f_lineno, frame.f_globals) | |
| print('+++', fn, frame.f_lineno, name, ':', line.strip()) | |
| def user_return(self, frame, retval): | |
| print('+++ return', retval) | |
| 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)') |