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detect.py
#!/usr/bin/env python # # Author: Mike McKerns (mmckerns @caltech and @uqfoundation) # Copyright (c) 2008-2016 California Institute of Technology. # Copyright (c) 2016-2023 The Uncertainty Quantification Foundation. # License: 3-clause BSD. The full license text is available at: # - https://github.com/uqfoundation/dill/blob/master/LICENSE """ Methods for detecting objects leading to pickling failures. """ import dis from inspect import ismethod, isfunction, istraceback, isframe, iscode from .pointers import parent, reference, at, parents, children from .logger import trace __all__ = ['baditems','badobjects','badtypes','code','errors','freevars', 'getmodule','globalvars','nestedcode','nestedglobals','outermost', 'referredglobals','referrednested','trace','varnames'] def getmodule(object, _filename=None, force=False): """get the module of the object""" from inspect import getmodule as getmod module = getmod(object, _filename) if module or not force: return module import builtins from .source import getname name = getname(object, force=True) return builtins if name in vars(builtins).keys() else None def outermost(func): # is analogous to getsource(func,enclosing=True) """get outermost enclosing object (i.e. the outer function in a closure) NOTE: this is the object-equivalent of getsource(func, enclosing=True) """ if ismethod(func): _globals = func.__func__.__globals__ or {} elif isfunction(func): _globals = func.__globals__ or {} else: return #XXX: or raise? no matches _globals = _globals.items() # get the enclosing source from .source import getsourcelines try: lines,lnum = getsourcelines(func, enclosing=True) except Exception: #TypeError, IOError lines,lnum = [],None code = ''.join(lines) # get all possible names,objects that are named in the enclosing source _locals = ((name,obj) for (name,obj) in _globals if name in code) # now only save the objects that generate the enclosing block for name,obj in _locals: #XXX: don't really need 'name' try: if getsourcelines(obj) == (lines,lnum): return obj except Exception: #TypeError, IOError pass return #XXX: or raise? no matches def nestedcode(func, recurse=True): #XXX: or return dict of {co_name: co} ? """get the code objects for any nested functions (e.g. in a closure)""" func = code(func) if not iscode(func): return [] #XXX: or raise? no matches nested = set() for co in func.co_consts: if co is None: continue co = code(co) if co: nested.add(co) if recurse: nested |= set(nestedcode(co, recurse=True)) return list(nested) def code(func): """get the code object for the given function or method NOTE: use dill.source.getsource(CODEOBJ) to get the source code """ if ismethod(func): func = func.__func__ if isfunction(func): func = func.__code__ if istraceback(func): func = func.tb_frame if isframe(func): func = func.f_code if iscode(func): return func return #XXX: ugly: parse dis.dis for name after "<code object" in line and in globals? def referrednested(func, recurse=True): #XXX: return dict of {__name__: obj} ? """get functions defined inside of func (e.g. inner functions in a closure) NOTE: results may differ if the function has been executed or not. If len(nestedcode(func)) > len(referrednested(func)), try calling func(). If possible, python builds code objects, but delays building functions until func() is called. """ import gc funcs = set() # get the code objects, and try to track down by referrence for co in nestedcode(func, recurse): # look for function objects that refer to the code object for obj in gc.get_referrers(co): # get methods _ = getattr(obj, '__func__', None) # ismethod if getattr(_, '__code__', None) is co: funcs.add(obj) # get functions elif getattr(obj, '__code__', None) is co: funcs.add(obj) # get frame objects elif getattr(obj, 'f_code', None) is co: funcs.add(obj) # get code objects elif hasattr(obj, 'co_code') and obj is co: funcs.add(obj) # frameobjs => func.__code__.co_varnames not in func.__code__.co_cellvars # funcobjs => func.__code__.co_cellvars not in func.__code__.co_varnames # frameobjs are not found, however funcobjs are... # (see: test_mixins.quad ... and test_mixins.wtf) # after execution, code objects get compiled, and then may be found by gc return list(funcs) def freevars(func): """get objects defined in enclosing code that are referred to by func returns a dict of {name:object}""" if ismethod(func): func = func.__func__ if isfunction(func): closures = func.__closure__ or () func = func.__code__.co_freevars # get freevars else: return {} def get_cell_contents(): for name, c in zip(func, closures): try: cell_contents = c.cell_contents except ValueError: # cell is empty continue yield name, c.cell_contents return dict(get_cell_contents()) # thanks to Davies Liu for recursion of globals def nestedglobals(func, recurse=True): """get the names of any globals found within func""" func = code(func) if func is None: return list() import sys from .temp import capture CAN_NULL = sys.hexversion >= 0x30b00a7 # NULL may be prepended >= 3.11a7 names = set() with capture('stdout') as out: dis.dis(func) #XXX: dis.dis(None) disassembles last traceback for line in out.getvalue().splitlines(): if '_GLOBAL' in line: name = line.split('(')[-1].split(')')[0] if CAN_NULL: names.add(name.replace('NULL + ', '')) else: names.add(name) for co in getattr(func, 'co_consts', tuple()): if co and recurse and iscode(co): names.update(nestedglobals(co, recurse=True)) return list(names) def referredglobals(func, recurse=True, builtin=False): """get the names of objects in the global scope referred to by func""" return globalvars(func, recurse, builtin).keys() def globalvars(func, recurse=True, builtin=False): """get objects defined in global scope that are referred to by func return a dict of {name:object}""" if ismethod(func): func = func.__func__ if isfunction(func): globs = vars(getmodule(sum)).copy() if builtin else {} # get references from within closure orig_func, func = func, set() for obj in orig_func.__closure__ or {}: try: cell_contents = obj.cell_contents except ValueError: # cell is empty pass else: _vars = globalvars(cell_contents, recurse, builtin) or {} func.update(_vars) #XXX: (above) be wary of infinte recursion? globs.update(_vars) # get globals globs.update(orig_func.__globals__ or {}) # get names of references if not recurse: func.update(orig_func.__code__.co_names) else: func.update(nestedglobals(orig_func.__code__)) # find globals for all entries of func for key in func.copy(): #XXX: unnecessary...? nested_func = globs.get(key) if nested_func is orig_func: #func.remove(key) if key in func else None continue #XXX: globalvars(func, False)? func.update(globalvars(nested_func, True, builtin)) elif iscode(func): globs = vars(getmodule(sum)).copy() if builtin else {} #globs.update(globals()) if not recurse: func = func.co_names # get names else: orig_func = func.co_name # to stop infinite recursion func = set(nestedglobals(func)) # find globals for all entries of func for key in func.copy(): #XXX: unnecessary...? if key is orig_func: #func.remove(key) if key in func else None continue #XXX: globalvars(func, False)? nested_func = globs.get(key) func.update(globalvars(nested_func, True, builtin)) else: return {} #NOTE: if name not in __globals__, then we skip it... return dict((name,globs[name]) for name in func if name in globs) def varnames(func): """get names of variables defined by func returns a tuple (local vars, local vars referrenced by nested functions)""" func = code(func) if not iscode(func): return () #XXX: better ((),())? or None? return func.co_varnames, func.co_cellvars def baditems(obj, exact=False, safe=False): #XXX: obj=globals() ? """get items in object that fail to pickle""" if not hasattr(obj,'__iter__'): # is not iterable return [j for j in (badobjects(obj,0,exact,safe),) if j is not None] obj = obj.values() if getattr(obj,'values',None) else obj _obj = [] # can't use a set, as items may be unhashable [_obj.append(badobjects(i,0,exact,safe)) for i in obj if i not in _obj] return [j for j in _obj if j is not None] def badobjects(obj, depth=0, exact=False, safe=False): """get objects that fail to pickle""" from dill import pickles if not depth: if pickles(obj,exact,safe): return None return obj return dict(((attr, badobjects(getattr(obj,attr),depth-1,exact,safe)) \ for attr in dir(obj) if not pickles(getattr(obj,attr),exact,safe))) def badtypes(obj, depth=0, exact=False, safe=False): """get types for objects that fail to pickle""" from dill import pickles if not depth: if pickles(obj,exact,safe): return None return type(obj) return dict(((attr, badtypes(getattr(obj,attr),depth-1,exact,safe)) \ for attr in dir(obj) if not pickles(getattr(obj,attr),exact,safe))) def errors(obj, depth=0, exact=False, safe=False): """get errors for objects that fail to pickle""" from dill import pickles, copy if not depth: try: pik = copy(obj) if exact: assert pik == obj, \ "Unpickling produces %s instead of %s" % (pik,obj) assert type(pik) == type(obj), \ "Unpickling produces %s instead of %s" % (type(pik),type(obj)) return None except Exception: import sys return sys.exc_info()[1] _dict = {} for attr in dir(obj): try: _attr = getattr(obj,attr) except Exception: import sys _dict[attr] = sys.exc_info()[1] continue if not pickles(_attr,exact,safe): _dict[attr] = errors(_attr,depth-1,exact,safe) return _dict # EOF
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