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308 lines
12 KiB
308 lines
12 KiB
#!/usr/bin/env python
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#
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# Author: Mike McKerns (mmckerns @caltech and @uqfoundation)
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# Copyright (c) 2008-2016 California Institute of Technology.
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# Copyright (c) 2016-2018 The Uncertainty Quantification Foundation.
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# License: 3-clause BSD. The full license text is available at:
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# - https://github.com/uqfoundation/dill/blob/master/LICENSE
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"""
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Methods for detecting objects leading to pickling failures.
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"""
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import dis
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from inspect import ismethod, isfunction, istraceback, isframe, iscode
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from .pointers import parent, reference, at, parents, children
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from ._dill import _trace as trace
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from ._dill import PY3
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__all__ = ['baditems','badobjects','badtypes','code','errors','freevars',
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'getmodule','globalvars','nestedcode','nestedglobals','outermost',
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'referredglobals','referrednested','trace','varnames']
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def getmodule(object, _filename=None, force=False):
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"""get the module of the object"""
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from inspect import getmodule as getmod
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module = getmod(object, _filename)
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if module or not force: return module
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if PY3: builtins = 'builtins'
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else: builtins = '__builtin__'
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builtins = __import__(builtins)
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from .source import getname
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name = getname(object, force=True)
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return builtins if name in vars(builtins).keys() else None
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def outermost(func): # is analogous to getsource(func,enclosing=True)
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"""get outermost enclosing object (i.e. the outer function in a closure)
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NOTE: this is the object-equivalent of getsource(func, enclosing=True)
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"""
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if PY3:
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if ismethod(func):
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_globals = func.__func__.__globals__ or {}
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elif isfunction(func):
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_globals = func.__globals__ or {}
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else:
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return #XXX: or raise? no matches
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_globals = _globals.items()
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else:
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if ismethod(func):
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_globals = func.im_func.func_globals or {}
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elif isfunction(func):
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_globals = func.func_globals or {}
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else:
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return #XXX: or raise? no matches
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_globals = _globals.iteritems()
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# get the enclosing source
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from .source import getsourcelines
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try: lines,lnum = getsourcelines(func, enclosing=True)
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except: #TypeError, IOError
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lines,lnum = [],None
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code = ''.join(lines)
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# get all possible names,objects that are named in the enclosing source
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_locals = ((name,obj) for (name,obj) in _globals if name in code)
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# now only save the objects that generate the enclosing block
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for name,obj in _locals: #XXX: don't really need 'name'
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try:
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if getsourcelines(obj) == (lines,lnum): return obj
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except: #TypeError, IOError
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pass
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return #XXX: or raise? no matches
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def nestedcode(func, recurse=True): #XXX: or return dict of {co_name: co} ?
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"""get the code objects for any nested functions (e.g. in a closure)"""
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func = code(func)
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if not iscode(func): return [] #XXX: or raise? no matches
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nested = set()
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for co in func.co_consts:
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if co is None: continue
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co = code(co)
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if co:
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nested.add(co)
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if recurse: nested |= set(nestedcode(co, recurse=True))
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return list(nested)
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def code(func):
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'''get the code object for the given function or method
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NOTE: use dill.source.getsource(CODEOBJ) to get the source code
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'''
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if PY3:
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im_func = '__func__'
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func_code = '__code__'
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else:
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im_func = 'im_func'
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func_code = 'func_code'
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if ismethod(func): func = getattr(func, im_func)
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if isfunction(func): func = getattr(func, func_code)
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if istraceback(func): func = func.tb_frame
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if isframe(func): func = func.f_code
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if iscode(func): return func
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return
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#XXX: ugly: parse dis.dis for name after "<code object" in line and in globals?
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def referrednested(func, recurse=True): #XXX: return dict of {__name__: obj} ?
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"""get functions defined inside of func (e.g. inner functions in a closure)
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NOTE: results may differ if the function has been executed or not.
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If len(nestedcode(func)) > len(referrednested(func)), try calling func().
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If possible, python builds code objects, but delays building functions
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until func() is called.
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"""
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if PY3:
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att1 = '__code__'
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att0 = '__func__'
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else:
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att1 = 'func_code' # functions
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att0 = 'im_func' # methods
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import gc
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funcs = set()
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# get the code objects, and try to track down by referrence
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for co in nestedcode(func, recurse):
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# look for function objects that refer to the code object
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for obj in gc.get_referrers(co):
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# get methods
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_ = getattr(obj, att0, None) # ismethod
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if getattr(_, att1, None) is co: funcs.add(obj)
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# get functions
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elif getattr(obj, att1, None) is co: funcs.add(obj)
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# get frame objects
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elif getattr(obj, 'f_code', None) is co: funcs.add(obj)
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# get code objects
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elif hasattr(obj, 'co_code') and obj is co: funcs.add(obj)
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# frameobjs => func.func_code.co_varnames not in func.func_code.co_cellvars
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# funcobjs => func.func_code.co_cellvars not in func.func_code.co_varnames
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# frameobjs are not found, however funcobjs are...
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# (see: test_mixins.quad ... and test_mixins.wtf)
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# after execution, code objects get compiled, and then may be found by gc
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return list(funcs)
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def freevars(func):
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"""get objects defined in enclosing code that are referred to by func
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returns a dict of {name:object}"""
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if PY3:
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im_func = '__func__'
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func_code = '__code__'
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func_closure = '__closure__'
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else:
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im_func = 'im_func'
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func_code = 'func_code'
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func_closure = 'func_closure'
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if ismethod(func): func = getattr(func, im_func)
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if isfunction(func):
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closures = getattr(func, func_closure) or ()
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func = getattr(func, func_code).co_freevars # get freevars
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else:
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return {}
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return dict((name,c.cell_contents) for (name,c) in zip(func,closures))
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# thanks to Davies Liu for recursion of globals
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def nestedglobals(func, recurse=True):
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"""get the names of any globals found within func"""
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func = code(func)
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if func is None: return list()
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from .temp import capture
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names = set()
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with capture('stdout') as out:
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dis.dis(func) #XXX: dis.dis(None) disassembles last traceback
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for line in out.getvalue().splitlines():
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if '_GLOBAL' in line:
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name = line.split('(')[-1].split(')')[0]
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names.add(name)
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for co in getattr(func, 'co_consts', tuple()):
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if co and recurse and iscode(co):
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names.update(nestedglobals(co, recurse=True))
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return list(names)
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def referredglobals(func, recurse=True, builtin=False):
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"""get the names of objects in the global scope referred to by func"""
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return globalvars(func, recurse, builtin).keys()
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def globalvars(func, recurse=True, builtin=False):
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"""get objects defined in global scope that are referred to by func
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return a dict of {name:object}"""
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if PY3:
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im_func = '__func__'
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func_code = '__code__'
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func_globals = '__globals__'
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func_closure = '__closure__'
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else:
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im_func = 'im_func'
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func_code = 'func_code'
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func_globals = 'func_globals'
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func_closure = 'func_closure'
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if ismethod(func): func = getattr(func, im_func)
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if isfunction(func):
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globs = vars(getmodule(sum)).copy() if builtin else {}
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# get references from within closure
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orig_func, func = func, set()
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for obj in getattr(orig_func, func_closure) or {}:
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_vars = globalvars(obj.cell_contents, recurse, builtin) or {}
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func.update(_vars) #XXX: (above) be wary of infinte recursion?
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globs.update(_vars)
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# get globals
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globs.update(getattr(orig_func, func_globals) or {})
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# get names of references
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if not recurse:
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func.update(getattr(orig_func, func_code).co_names)
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else:
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func.update(nestedglobals(getattr(orig_func, func_code)))
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# find globals for all entries of func
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for key in func.copy(): #XXX: unnecessary...?
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nested_func = globs.get(key)
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if nested_func == orig_func:
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#func.remove(key) if key in func else None
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continue #XXX: globalvars(func, False)?
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func.update(globalvars(nested_func, True, builtin))
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elif iscode(func):
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globs = vars(getmodule(sum)).copy() if builtin else {}
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#globs.update(globals())
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if not recurse:
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func = func.co_names # get names
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else:
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orig_func = func.co_name # to stop infinite recursion
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func = set(nestedglobals(func))
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# find globals for all entries of func
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for key in func.copy(): #XXX: unnecessary...?
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if key == orig_func:
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#func.remove(key) if key in func else None
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continue #XXX: globalvars(func, False)?
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nested_func = globs.get(key)
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func.update(globalvars(nested_func, True, builtin))
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else:
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return {}
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#NOTE: if name not in func_globals, then we skip it...
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return dict((name,globs[name]) for name in func if name in globs)
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def varnames(func):
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"""get names of variables defined by func
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returns a tuple (local vars, local vars referrenced by nested functions)"""
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func = code(func)
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if not iscode(func):
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return () #XXX: better ((),())? or None?
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return func.co_varnames, func.co_cellvars
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def baditems(obj, exact=False, safe=False): #XXX: obj=globals() ?
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"""get items in object that fail to pickle"""
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if not hasattr(obj,'__iter__'): # is not iterable
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return [j for j in (badobjects(obj,0,exact,safe),) if j is not None]
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obj = obj.values() if getattr(obj,'values',None) else obj
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_obj = [] # can't use a set, as items may be unhashable
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[_obj.append(badobjects(i,0,exact,safe)) for i in obj if i not in _obj]
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return [j for j in _obj if j is not None]
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def badobjects(obj, depth=0, exact=False, safe=False):
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"""get objects that fail to pickle"""
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from dill import pickles
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if not depth:
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if pickles(obj,exact,safe): return None
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return obj
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return dict(((attr, badobjects(getattr(obj,attr),depth-1,exact,safe)) \
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for attr in dir(obj) if not pickles(getattr(obj,attr),exact,safe)))
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def badtypes(obj, depth=0, exact=False, safe=False):
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"""get types for objects that fail to pickle"""
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from dill import pickles
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if not depth:
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if pickles(obj,exact,safe): return None
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return type(obj)
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return dict(((attr, badtypes(getattr(obj,attr),depth-1,exact,safe)) \
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for attr in dir(obj) if not pickles(getattr(obj,attr),exact,safe)))
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def errors(obj, depth=0, exact=False, safe=False):
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"""get errors for objects that fail to pickle"""
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from dill import pickles, copy
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if not depth:
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try:
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pik = copy(obj)
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if exact:
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assert pik == obj, \
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"Unpickling produces %s instead of %s" % (pik,obj)
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assert type(pik) == type(obj), \
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"Unpickling produces %s instead of %s" % (type(pik),type(obj))
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return None
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except Exception:
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import sys
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return sys.exc_info()[1]
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_dict = {}
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for attr in dir(obj):
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try:
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_attr = getattr(obj,attr)
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except Exception:
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import sys
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_dict[attr] = sys.exc_info()[1]
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continue
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if not pickles(_attr,exact,safe):
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_dict[attr] = errors(_attr,depth-1,exact,safe)
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return _dict
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# EOF
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