def test_heterogeneous_tuple(self):
ast = self._load_ast(
"a", """
from typing import Tuple
x = ... # type: Tuple[str, int]
""")
x = ast.Lookup("a.x").type
cls = self._vm.convert.constant_to_value("x", x, {},
self._vm.root_cfg_node)
instance = self._vm.convert.constant_to_value("x",
abstract.AsInstance(x),
{},
self._vm.root_cfg_node)
self.assertIsInstance(cls, abstract.TupleClass)
self.assertListEqual(sorted(cls.type_parameters.items()),
[(0, self._vm.convert.str_type.data[0]),
(1, self._vm.convert.int_type.data[0]),
(abstract.T,
abstract.Union([
cls.type_parameters[0],
cls.type_parameters[1],
], self._vm))])
self.assertIsInstance(instance, abstract.Tuple)
self.assertListEqual(
[v.data for v in instance.pyval],
[[self._vm.convert.primitive_class_instances[str]],
[self._vm.convert.primitive_class_instances[int]]])
self.assertListEqual(instance.type_parameters[abstract.T].data, [
self._vm.convert.primitive_class_instances[str],
self._vm.convert.primitive_class_instances[int]
])
def test_callable_with_args(self):
ast = self._load_ast(
"a", """
from typing import Callable
x = ... # type: Callable[[int, bool], str]
""")
x = ast.Lookup("a.x").type
cls = self._vm.convert.constant_to_value(x, {}, self._vm.root_cfg_node)
instance = self._vm.convert.constant_to_value(abstract.AsInstance(x),
{},
self._vm.root_cfg_node)
self.assertIsInstance(cls, abstract.Callable)
self.assertItemsEqual(
cls.type_parameters.items(),
[(0, self._vm.convert.int_type),
(1, self._vm.convert.primitive_classes[bool]),
(abstract.ARGS,
abstract.Union([cls.type_parameters[0], cls.type_parameters[1]],
self._vm)),
(abstract.RET, self._vm.convert.str_type)])
self.assertIsInstance(instance, abstract.Instance)
self.assertEqual(abstract.get_atomic_value(instance.cls), cls)
self.assertItemsEqual([
(name, set(var.data))
for name, var in instance.type_parameters.items()
], [(abstract.ARGS, {
self._vm.convert.primitive_class_instances[int],
self._vm.convert.primitive_class_instances[bool]
}), (abstract.RET, {self._vm.convert.primitive_class_instances[str]})])
def _create_call_arg(self, name, t, node):
if t == pytd.ClassType("__builtin__.object"):
# As an arg, "object" means: we can use anything for this argument,
# because everything inherits from object.
# TODO(kramm): Maybe we should use AnythingType for params without type.
return self.convert.create_new_unsolvable(node, name)
else:
return self.convert.convert_constant(
name, abstract.AsInstance(t), subst={}, node=self.root_cfg_node)
def test_classvar_instance(self):
ast = self._load_ast("a", """
from typing import ClassVar
class X:
v: ClassVar[int]
""")
pyval = ast.Lookup("a.X").Lookup("v").type
v = self._vm.convert.constant_to_value(
abstract.AsInstance(pyval), {}, self._vm.root_cfg_node)
self.assertEqual(v, self._vm.convert.primitive_class_instances[int])
def test_callable_no_args(self):
ast = self._load_ast("a", """
from typing import Callable
x = ... # type: Callable[[], ...]
""")
x = ast.Lookup("a.x").type
cls = self._vm.convert.constant_to_value(x, {}, self._vm.root_cfg_node)
instance = self._vm.convert.constant_to_value(
abstract.AsInstance(x), {}, self._vm.root_cfg_node)
self.assertIsInstance(cls.type_parameters[abstract.ARGS], abstract.Empty)
self.assertEqual(
abstract.get_atomic_value(instance.type_parameters[abstract.ARGS]),
self._vm.convert.empty)
def test_plain_callable(self):
ast = self._load_ast("a", """
from typing import Callable
x = ... # type: Callable[..., int]
""")
x = ast.Lookup("a.x").type
cls = self._vm.convert.constant_to_value(x, {}, self._vm.root_cfg_node)
instance = self._vm.convert.constant_to_value(
abstract.AsInstance(x), {}, self._vm.root_cfg_node)
self.assertIsInstance(cls, abstract.ParameterizedClass)
self.assertItemsEqual(cls.type_parameters.items(),
[(abstract.ARGS, self._vm.convert.unsolvable),
(abstract.RET, self._vm.convert.int_type)])
self.assertIsInstance(instance, abstract.Instance)
self.assertEqual(abstract.get_atomic_value(instance.cls), cls.base_cls)
self.assertItemsEqual(
[(name, var.data) for name, var in instance.type_parameters.items()],
[(abstract.ARGS, [self._vm.convert.unsolvable]),
(abstract.RET, [self._vm.convert.primitive_class_instances[int]])])
def testTupleSubclass(self):
subclass = self._parse_and_lookup("""
from typing import Tuple
class A(Tuple[bool, int]): ...""", "A")
left = self.vm.convert.constant_to_value(
"", abstract.AsInstance(subclass), {}, self.vm.root_cfg_node)
right1 = self._convert("Tuple[bool, int]", as_instance=False)
right2 = self._convert("Tuple[int, bool]", as_instance=False)
right3 = self._convert("Tuple[int, int]", as_instance=False)
right4 = self._convert("Tuple[int]", as_instance=False)
right5 = self._convert("tuple", as_instance=False)
right6 = self._convert("Tuple[bool, ...]", as_instance=False)
right7 = self._convert("Tuple[int, ...]", as_instance=False)
self.assertMatch(left, right1)
self.assertNoMatch(left, right2)
self.assertMatch(left, right3)
self.assertNoMatch(left, right4)
self.assertMatch(left, right5)
self.assertNoMatch(left, right6)
self.assertMatch(left, right7)
def _convert(self, t, as_instance):
"""Convenience function for turning a string into an abstract value.
Note that this function cannot be called more than once per test with
the same arguments, since we hash the arguments to get a filename for
the temporary pyi.
Args:
t: The string representation of a type.
as_instance: Whether to convert as an instance.
Returns:
An AtomicAbstractValue.
"""
src = "from typing import Tuple, Type\n"
src += "x = ... # type: " + t
filename = str(hash((t, as_instance)))
x = self._parse_and_lookup(src, "x", filename).type
if as_instance:
x = abstract.AsInstance(x)
return self.vm.convert.constant_to_value("", x, {}, self.vm.root_cfg_node)
def call(self, node, func, args):
if self.vm.PY3:
# In Python 3, the type of IO object returned depends on the mode.
self.match_args(node, args) # May raise FailedFunctionCall.
sig, = self.signatures
callargs = {
name: var
for name, var, _ in sig.signature.iter_args(args)
}
try:
if "mode" not in callargs:
io_type = "Text" # The default mode is 'r'.
else:
mode = abstract.get_atomic_python_constant(
callargs["mode"])
io_type = "Binary" if "b" in mode else "Text"
except abstract.ConversionError:
pass
else:
return node, self.vm.convert.constant_to_var(
abstract.AsInstance(
self.vm.lookup_builtin("typing.%sIO" % io_type)), {},
node)
return super(Open, self).call(node, func, args)
def _constant_to_value(self, pyval, subst, get_node):
"""Create a AtomicAbstractValue that represents a python constant.
This supports both constant from code constant pools and PyTD constants such
as classes. This also supports builtin python objects such as int and float.
Args:
pyval: The python or PyTD value to convert.
subst: The current type parameters.
get_node: A getter function for the current node.
Returns:
A Value that represents the constant, or None if we couldn't convert.
Raises:
NotImplementedError: If we don't know how to convert a value.
TypeParameterError: If we can't find a substitution for a type parameter.
"""
if pyval.__class__ is str:
# We use a subclass of str, compat.BytesPy3, to mark Python 3
# bytestrings, which are converted to abstract bytes instances.
# compat.BytesType dispatches to this when appropriate.
return abstract.AbstractOrConcreteValue(pyval, self.str_type,
self.vm)
elif isinstance(pyval, compat.UnicodeType):
return abstract.AbstractOrConcreteValue(pyval, self.unicode_type,
self.vm)
elif isinstance(pyval, compat.BytesType):
return abstract.AbstractOrConcreteValue(pyval, self.bytes_type,
self.vm)
elif isinstance(pyval, bool):
return self.true if pyval is True else self.false
elif isinstance(pyval, int) and -1 <= pyval <= MAX_IMPORT_DEPTH:
# For small integers, preserve the actual value (for things like the
# level in IMPORT_NAME).
return abstract.AbstractOrConcreteValue(pyval, self.int_type,
self.vm)
elif isinstance(pyval, compat.LongType):
# long is aliased to int
return self.primitive_class_instances[int]
elif pyval.__class__ in self.primitive_classes:
return self.primitive_class_instances[pyval.__class__]
elif isinstance(pyval, (loadmarshal.CodeType, blocks.OrderedCode)):
return abstract.AbstractOrConcreteValue(
pyval, self.primitive_classes[types.CodeType], self.vm)
elif pyval is super:
return special_builtins.Super(self.vm)
elif pyval is object:
return special_builtins.Object(self.vm)
elif pyval.__class__ is type:
try:
return self.name_to_value(self._type_to_name(pyval), subst)
except (KeyError, AttributeError):
log.debug("Failed to find pytd", exc_info=True)
raise
elif isinstance(pyval, pytd.LateType):
actual = self._load_late_type(pyval)
return self._constant_to_value(actual, subst, get_node)
elif isinstance(pyval, pytd.TypeDeclUnit):
return self._create_module(pyval)
elif isinstance(pyval, pytd.Module):
mod = self.vm.loader.import_name(pyval.module_name)
return self._create_module(mod)
elif isinstance(pyval, pytd.Class):
if pyval.name == "__builtin__.super":
return self.vm.special_builtins["super"]
elif pyval.name == "__builtin__.object":
return self.object_type
elif pyval.name == "types.ModuleType":
return self.module_type
elif pyval.name == "_importlib_modulespec.ModuleType":
# Python 3's typeshed uses a stub file indirection to define ModuleType
# even though it is exported via types.pyi.
return self.module_type
else:
module, dot, base_name = pyval.name.rpartition(".")
try:
cls = abstract.PyTDClass(base_name, pyval, self.vm)
except mro.MROError as e:
self.vm.errorlog.mro_error(self.vm.frames, base_name,
e.mro_seqs)
cls = self.unsolvable
else:
if dot:
cls.module = module
return cls
elif isinstance(pyval, pytd.Function):
signatures = [
abstract.PyTDSignature(pyval.name, sig, self.vm)
for sig in pyval.signatures
]
type_new = self.vm.lookup_builtin("__builtin__.type").Lookup(
"__new__")
if pyval is type_new:
f_cls = special_builtins.TypeNew
else:
f_cls = abstract.PyTDFunction
f = f_cls(pyval.name, signatures, pyval.kind, self.vm)
f.is_abstract = pyval.is_abstract
return f
elif isinstance(pyval, pytd.ClassType):
assert pyval.cls
return self.constant_to_value(pyval.cls, subst,
self.vm.root_cfg_node)
elif isinstance(pyval, pytd.NothingType):
return self.empty
elif isinstance(pyval, pytd.AnythingType):
return self.unsolvable
elif (isinstance(pyval, pytd.Constant)
and isinstance(pyval.type, pytd.AnythingType)):
# We allow "X = ... # type: Any" to declare X as a type.
return self.unsolvable
elif isinstance(pyval, pytd.FunctionType):
return self.constant_to_value(pyval.function, subst,
self.vm.root_cfg_node)
elif isinstance(pyval, pytd.UnionType):
options = [
self.constant_to_value(t, subst, self.vm.root_cfg_node)
for t in pyval.type_list
]
if len(options) > 1:
return abstract.Union(options, self.vm)
else:
return options[0]
elif isinstance(pyval, pytd.TypeParameter):
constraints = tuple(
self.constant_to_value(c, {}, self.vm.root_cfg_node)
for c in pyval.constraints)
bound = (pyval.bound and self.constant_to_value(
pyval.bound, {}, self.vm.root_cfg_node))
return abstract.TypeParameter(pyval.name,
self.vm,
constraints=constraints,
bound=bound)
elif isinstance(pyval, abstract.AsInstance):
cls = pyval.cls
if isinstance(cls, pytd.LateType):
actual = self._load_late_type(cls)
if not isinstance(actual, pytd.ClassType):
return self.unsolvable
cls = actual.cls
if isinstance(cls, pytd.ClassType):
cls = cls.cls
if (isinstance(cls, pytd.GenericType)
and cls.base_type.name == "typing.ClassVar"):
param, = cls.parameters
return self.constant_to_value(abstract.AsInstance(param),
subst, self.vm.root_cfg_node)
elif isinstance(cls,
pytd.GenericType) or (isinstance(cls, pytd.Class)
and cls.template):
# If we're converting a generic Class, need to create a new instance of
# it. See test_classes.testGenericReinstantiated.
if isinstance(cls, pytd.Class):
params = tuple(t.type_param.upper_value
for t in cls.template)
cls = pytd.GenericType(base_type=pytd.ClassType(
cls.name, cls),
parameters=params)
if isinstance(cls.base_type, pytd.LateType):
actual = self._load_late_type(cls.base_type)
if not isinstance(actual, pytd.ClassType):
return self.unsolvable
base_cls = actual.cls
else:
assert isinstance(cls.base_type, pytd.ClassType)
base_cls = cls.base_type.cls
assert isinstance(base_cls, pytd.Class), base_cls
if base_cls.name == "__builtin__.type":
c, = cls.parameters
if isinstance(c, pytd.TypeParameter):
if not subst or c.name not in subst:
raise self.TypeParameterError(c.name)
return self.merge_classes(get_node(),
subst[c.name].data)
else:
return self.constant_to_value(c, subst,
self.vm.root_cfg_node)
elif isinstance(cls, pytd.TupleType):
content = tuple(
self.constant_to_var(abstract.AsInstance(p), subst,
get_node())
for p in cls.parameters)
return abstract.Tuple(content, self.vm)
elif isinstance(cls, pytd.CallableType):
clsval = self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
return abstract.Instance(clsval, self.vm)
else:
clsval = self.constant_to_value(base_cls, subst,
self.vm.root_cfg_node)
instance = abstract.Instance(clsval, self.vm)
num_params = len(cls.parameters)
assert num_params <= len(base_cls.template)
for i, formal in enumerate(base_cls.template):
if i < num_params:
node = get_node()
p = self.constant_to_var(
abstract.AsInstance(cls.parameters[i]), subst,
node)
else:
# An omitted type parameter implies `Any`.
node = self.vm.root_cfg_node
p = self.unsolvable.to_variable(node)
instance.merge_type_parameter(node, formal.name, p)
return instance
elif isinstance(cls, pytd.Class):
assert not cls.template
# This key is also used in __init__
key = (abstract.Instance, cls)
if key not in self._convert_cache:
if cls.name in [
"__builtin__.type", "__builtin__.property"
]:
# An instance of "type" or of an anonymous property can be anything.
instance = self._create_new_unknown_value("type")
else:
mycls = self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
instance = abstract.Instance(mycls, self.vm)
log.info("New pytd instance for %s: %r", cls.name,
instance)
self._convert_cache[key] = instance
return self._convert_cache[key]
else:
return self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
elif (isinstance(pyval, pytd.GenericType)
and pyval.base_type.name == "typing.ClassVar"):
param, = pyval.parameters
return self.constant_to_value(param, subst, self.vm.root_cfg_node)
elif isinstance(pyval, pytd.GenericType):
if isinstance(pyval.base_type, pytd.LateType):
actual = self._load_late_type(pyval.base_type)
if not isinstance(actual, pytd.ClassType):
return self.unsolvable
base = actual.cls
else:
assert isinstance(pyval.base_type, pytd.ClassType)
base = pyval.base_type.cls
assert isinstance(base, pytd.Class), base
base_cls = self.constant_to_value(base, subst,
self.vm.root_cfg_node)
if not isinstance(base_cls, abstract.Class):
# base_cls can be, e.g., an unsolvable due to an mro error.
return self.unsolvable
if isinstance(pyval, pytd.TupleType):
abstract_class = abstract.TupleClass
template = list(range(len(pyval.parameters))) + [abstract.T]
parameters = pyval.parameters + (pytd.UnionType(
pyval.parameters), )
elif isinstance(pyval, pytd.CallableType):
abstract_class = abstract.Callable
template = list(range(len(
pyval.args))) + [abstract.ARGS, abstract.RET]
parameters = pyval.args + (pytd_utils.JoinTypes(
pyval.args), pyval.ret)
else:
abstract_class = abstract.ParameterizedClass
template = tuple(t.name for t in base.template)
parameters = pyval.parameters
assert (pyval.base_type.name == "typing.Generic"
or len(parameters) <= len(template))
type_parameters = datatypes.LazyDict()
for i, name in enumerate(template):
if i < len(parameters):
type_parameters.add_lazy_item(name, self.constant_to_value,
parameters[i], subst,
self.vm.root_cfg_node)
else:
type_parameters[name] = self.unsolvable
return abstract_class(base_cls, type_parameters, self.vm)
elif pyval.__class__ is tuple: # only match raw tuple, not namedtuple/Node
return self.tuple_to_value([
self.constant_to_var(item, subst, self.vm.root_cfg_node)
for i, item in enumerate(pyval)
])
else:
raise NotImplementedError("Can't convert constant %s %r" %
(type(pyval), pyval))
def constant_to_var(self,
pyval,
subst=None,
node=None,
source_sets=None,
discard_concrete_values=False):
"""Convert a constant to a Variable.
This converts a constant to a cfg.Variable. Unlike constant_to_value, it
can handle things that need to be represented as a Variable with multiple
possible values (i.e., a union type), like pytd.Function.
Args:
pyval: The Python constant to convert. Can be a PyTD definition or a
builtin constant.
subst: The current type parameters.
node: The current CFG node. (For instances)
source_sets: An iterator over instances of SourceSet (or just tuples).
discard_concrete_values: Whether concrete values should be discarded from
type parameters.
Returns:
A cfg.Variable.
Raises:
TypeParameterError: if conversion is attempted on a type parameter without
a substitution.
ValueError: if pytype is not of a known type.
"""
source_sets = source_sets or [[]]
node = node or self.vm.root_cfg_node
if isinstance(pyval, pytd.NothingType):
return self.vm.program.NewVariable([], [], self.vm.root_cfg_node)
elif isinstance(pyval, pytd.Alias):
return self.constant_to_var(pyval.type, subst, node, source_sets,
discard_concrete_values)
elif isinstance(pyval, abstract.AsInstance):
cls = pyval.cls
if isinstance(cls, pytd.AnythingType):
return self.create_new_unsolvable(node)
elif (isinstance(pyval, abstract.AsReturnValue)
and isinstance(cls, pytd.NothingType)):
return self.no_return.to_variable(node)
var = self.vm.program.NewVariable()
for t in pytd_utils.UnpackUnion(cls):
if isinstance(t, pytd.TypeParameter):
if not subst or t.name not in subst:
raise self.TypeParameterError(t.name)
else:
for v in subst[t.name].bindings:
for source_set in source_sets:
var.AddBinding(
self.get_maybe_abstract_instance(v.data)
if discard_concrete_values else v.data,
source_set + [v], node)
elif isinstance(t, pytd.NothingType):
pass
else:
value = self.constant_to_value(abstract.AsInstance(t),
subst, node)
for source_set in source_sets:
var.AddBinding(value, source_set, node)
return var
elif isinstance(pyval, pytd.Constant):
return self.constant_to_var(abstract.AsInstance(pyval.type), subst,
node, source_sets,
discard_concrete_values)
result = self.constant_to_value(pyval, subst, node)
if result is not None:
return result.to_variable(node)
# There might still be bugs on the abstract intepreter when it returns,
# e.g. a list of values instead of a list of types:
assert pyval.__class__ != cfg.Variable, pyval
if pyval.__class__ == tuple:
# TODO(ampere): This does not allow subclasses. Handle namedtuple
# correctly.
# This case needs to go at the end because many things are actually also
# tuples.
return self.build_tuple(
self.vm.root_cfg_node, (self.constant_to_var(
v, subst, node, source_sets, discard_concrete_values)
for i, v in enumerate(pyval)))
raise ValueError("Cannot convert {} to an abstract value".format(
pyval.__class__))
def _convert(self, x, name, as_instance=False):
pyval = self._parse_and_lookup(x, name)
if as_instance:
pyval = abstract.AsInstance(pyval)
return self.vm.convert.constant_to_value(pyval, {},
self.vm.root_cfg_node)
def construct_constant_from_value(self, name, pyval, subst, node):
"""Create a AtomicAbstractValue that represents a python constant.
This supports both constant from code constant pools and PyTD constants such
as classes. This also supports builtin python objects such as int and float.
Args:
name: The name of this constant. Used for naming its attribute variables.
pyval: The python or PyTD value to convert.
subst: The current type parameters.
node: The current CFG node.
Returns:
A Value that represents the constant, or None if we couldn't convert.
Raises:
NotImplementedError: If we don't know how to convert a value.
"""
if pyval is type:
return abstract.SimpleAbstractValue(name, self.vm)
elif isinstance(pyval, str):
return abstract.AbstractOrConcreteValue(
pyval, self.str_type, self.vm, node)
elif isinstance(pyval, int) and -1 <= pyval <= MAX_IMPORT_DEPTH:
# For small integers, preserve the actual value (for things like the
# level in IMPORT_NAME).
return abstract.AbstractOrConcreteValue(
pyval, self.int_type, self.vm, node)
elif pyval.__class__ in self.primitive_classes:
return self.primitive_class_instances[pyval.__class__]
elif isinstance(pyval, (loadmarshal.CodeType, blocks.OrderedCode)):
return abstract.AbstractOrConcreteValue(
pyval, self.primitive_classes[types.CodeType], self.vm, node)
elif pyval.__class__ in [types.FunctionType,
types.ModuleType,
types.GeneratorType,
type]:
try:
pyclass = self.vm.vmbuiltins.Lookup("__builtin__." + pyval.__name__)
return self.convert_constant_to_value(name, pyclass, subst, node)
except (KeyError, AttributeError):
log.debug("Failed to find pytd", exc_info=True)
raise
elif isinstance(pyval, pytd.TypeDeclUnit):
data = pyval.constants + pyval.classes + pyval.functions + pyval.aliases
members = {val.name.rsplit(".")[-1]: val
for val in data}
return abstract.Module(self.vm, node, pyval.name, members)
elif isinstance(pyval, pytd.Class):
if "." in pyval.name:
module, base_name = pyval.name.rsplit(".", 1)
cls = abstract.PyTDClass(base_name, pyval, self.vm)
cls.module = module
else:
cls = abstract.PyTDClass(name, pyval, self.vm)
return cls
elif isinstance(pyval, pytd.Function):
signatures = [abstract.PyTDSignature(pyval.name, sig, self.vm)
for sig in pyval.signatures]
f = abstract.PyTDFunction(
pyval.name, signatures, pyval.kind, self.vm, node)
return f
elif isinstance(pyval, pytd.ClassType):
assert pyval.cls
return self.convert_constant_to_value(pyval.name, pyval.cls, subst, node)
elif isinstance(pyval, pytd.NothingType):
return self.nothing
elif isinstance(pyval, pytd.AnythingType):
# TODO(kramm): This should be an Unsolveable. We don't need to solve this.
return self._create_new_unknown_value("AnythingType")
elif isinstance(pyval, pytd.FunctionType):
return self.construct_constant_from_value(
name, pyval.function, subst, node)
elif isinstance(pyval, pytd.UnionType):
return abstract.Union([
self.convert_constant_to_value(pytd.Print(t), t, subst, node)
for t in pyval.type_list], self.vm)
elif isinstance(pyval, pytd.TypeParameter):
return abstract.TypeParameter(pyval.name, self.vm)
elif isinstance(pyval, abstract.AsInstance):
cls = pyval.cls
if isinstance(cls, pytd.ClassType):
cls = cls.cls
if isinstance(cls, pytd.Class):
# This key is also used in __init__
key = (abstract.Instance, cls)
if key not in self._convert_cache:
if cls.name in ["__builtin__.type", "__builtin__.property"]:
# An instance of "type" or of an anonymous property can be anything.
instance = self._create_new_unknown_value("type")
else:
mycls = self.convert_constant(cls.name, cls, subst, node)
instance = abstract.Instance(mycls, self.vm, node)
log.info("New pytd instance for %s: %r", cls.name, instance)
self._convert_cache[key] = instance
return self._convert_cache[key]
elif isinstance(cls, pytd.GenericType):
assert isinstance(cls.base_type, pytd.ClassType)
base_cls = cls.base_type.cls
instance = abstract.Instance(
self.convert_constant(base_cls.name, base_cls, subst, node),
self.vm, node)
for formal, actual in zip(base_cls.template, cls.parameters):
p = self.convert_constant(
repr(formal), abstract.AsInstance(actual), subst, node)
instance.initialize_type_parameter(node, formal.name, p)
return instance
else:
return self.convert_constant_to_value(name, cls, subst, node)
elif isinstance(pyval, pytd.GenericType):
assert isinstance(pyval.base_type, pytd.ClassType)
type_parameters = utils.LazyDict()
for param, value in zip(pyval.base_type.cls.template, pyval.parameters):
type_parameters.add_lazy_item(
param.name, self.convert_constant_to_value,
param.name, value, subst, node)
cls = self.convert_constant_to_value(
pytd.Print(pyval.base_type), pyval.base_type.cls, subst, node)
return abstract.ParameterizedClass(cls, type_parameters, self.vm)
elif pyval.__class__ is tuple: # only match raw tuple, not namedtuple/Node
return self.tuple_to_value(self.vm.root_cfg_node,
[self.convert_constant("tuple[%d]" % i, item,
subst, node)
for i, item in enumerate(pyval)])
else:
raise NotImplementedError("Can't convert constant %s %r" %
(type(pyval), pyval))
def _constant_to_value(self, pyval, subst, get_node):
"""Create a AtomicAbstractValue that represents a python constant.
This supports both constant from code constant pools and PyTD constants such
as classes. This also supports builtin python objects such as int and float.
Args:
pyval: The python or PyTD value to convert.
subst: The current type parameters.
get_node: A getter function for the current node.
Returns:
A Value that represents the constant, or None if we couldn't convert.
Raises:
NotImplementedError: If we don't know how to convert a value.
TypeParameterError: If we can't find a substitution for a type parameter.
"""
if isinstance(pyval, str):
return abstract.AbstractOrConcreteValue(pyval, self.str_type,
self.vm)
elif isinstance(pyval, int) and -1 <= pyval <= MAX_IMPORT_DEPTH:
# For small integers, preserve the actual value (for things like the
# level in IMPORT_NAME).
return abstract.AbstractOrConcreteValue(pyval, self.int_type,
self.vm)
elif isinstance(pyval, long):
# long is aliased to int
return self.primitive_class_instances[int]
elif pyval.__class__ in self.primitive_classes:
return self.primitive_class_instances[pyval.__class__]
elif isinstance(pyval, (loadmarshal.CodeType, blocks.OrderedCode)):
return abstract.AbstractOrConcreteValue(
pyval, self.primitive_classes[types.CodeType], self.vm)
elif pyval is super:
return special_builtins.Super(self.vm)
elif pyval is object:
return special_builtins.Object(self.vm)
elif pyval.__class__ is type:
if pyval is types.FunctionType:
classname = "typing.Callable"
else:
classname = "__builtin__." + pyval.__name__
try:
return self.name_to_value(classname, subst)
except (KeyError, AttributeError):
log.debug("Failed to find pytd", exc_info=True)
raise
elif isinstance(pyval, pytd.TypeDeclUnit):
data = (pyval.constants + pyval.type_params + pyval.classes +
pyval.functions + pyval.aliases)
members = {val.name.rsplit(".")[-1]: val for val in data}
return abstract.Module(self.vm, pyval.name, members, pyval)
elif isinstance(pyval,
pytd.Class) and pyval.name == "__builtin__.super":
return self.vm.special_builtins["super"]
elif isinstance(pyval,
pytd.Class) and pyval.name == "__builtin__.object":
return self.object_type
elif isinstance(pyval,
pytd.Class) and pyval.name == "types.ModuleType":
return self.module_type
elif isinstance(pyval, pytd.Class):
module, dot, base_name = pyval.name.rpartition(".")
try:
cls = abstract.PyTDClass(base_name, pyval, self.vm)
except mro.MROError as e:
self.vm.errorlog.mro_error(self.vm.frames, base_name,
e.mro_seqs)
cls = self.unsolvable
else:
if dot:
cls.module = module
return cls
elif isinstance(pyval, pytd.ExternalFunction):
module, _, name = pyval.name.partition(".")
assert module == "__builtin__", "PYTHONCODE allowed only in __builtin__"
return abstract.merge_values(
self.vm.frame.f_globals.members[name].data, self.vm)
elif isinstance(pyval, pytd.Function):
signatures = [
abstract.PyTDSignature(pyval.name, sig, self.vm)
for sig in pyval.signatures
]
type_new = self.vm.lookup_builtin("__builtin__.type").Lookup(
"__new__")
if pyval is type_new:
f_cls = special_builtins.TypeNew
else:
f_cls = abstract.PyTDFunction
f = f_cls(pyval.name, signatures, pyval.kind, self.vm)
f.is_abstract = pyval.is_abstract
return f
elif isinstance(pyval, pytd.ClassType):
assert pyval.cls
return self.constant_to_value(pyval.cls, subst,
self.vm.root_cfg_node)
elif isinstance(pyval, pytd.NothingType):
return self.nothing
elif isinstance(pyval, pytd.AnythingType):
return self.unsolvable
elif isinstance(pyval, pytd.FunctionType):
return self.constant_to_value(pyval.function, subst,
self.vm.root_cfg_node)
elif isinstance(pyval, pytd.UnionType):
options = [
self.constant_to_value(t, subst, self.vm.root_cfg_node)
for t in pyval.type_list
]
if len(options) > 1:
return abstract.Union(options, self.vm)
else:
return options[0]
elif isinstance(pyval, pytd.TypeParameter):
constraints = tuple(
self.constant_to_value(c, {}, self.vm.root_cfg_node)
for c in pyval.constraints)
bound = (pyval.bound and self.constant_to_value(
pyval.bound, {}, self.vm.root_cfg_node))
return abstract.TypeParameter(pyval.name,
self.vm,
constraints=constraints,
bound=bound)
elif isinstance(pyval, abstract.AsInstance):
cls = pyval.cls
if isinstance(cls, pytd.ClassType):
cls = cls.cls
if isinstance(cls, pytd.Class):
# This key is also used in __init__
key = (abstract.Instance, cls)
if key not in self._convert_cache:
if cls.name in [
"__builtin__.type", "__builtin__.property"
]:
# An instance of "type" or of an anonymous property can be anything.
instance = self._create_new_unknown_value("type")
else:
mycls = self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
instance = abstract.Instance(mycls, self.vm)
instance.make_template_unsolvable(
cls.template, self.vm.root_cfg_node)
log.info("New pytd instance for %s: %r", cls.name,
instance)
self._convert_cache[key] = instance
return self._convert_cache[key]
elif isinstance(cls, pytd.GenericType):
assert isinstance(cls.base_type, pytd.ClassType)
base_cls = cls.base_type.cls
if base_cls.name == "__builtin__.type":
c, = cls.parameters
if isinstance(c, pytd.TypeParameter):
if not subst or c.name not in subst:
raise self.TypeParameterError(c.name)
return self.merge_classes(get_node(),
subst[c.name].data)
else:
return self.constant_to_value(c, subst,
self.vm.root_cfg_node)
elif isinstance(cls, pytd.TupleType):
content = tuple(
self.constant_to_var(abstract.AsInstance(p), subst,
get_node())
for p in cls.parameters)
return abstract.Tuple(content, self.vm)
elif isinstance(cls, pytd.CallableType):
clsval = self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
return abstract.Instance(clsval, self.vm)
else:
clsval = self.constant_to_value(base_cls, subst,
self.vm.root_cfg_node)
instance = abstract.Instance(clsval, self.vm)
assert len(cls.parameters) <= len(base_cls.template)
for formal, actual in zip(base_cls.template,
cls.parameters):
p = self.constant_to_var(abstract.AsInstance(actual),
subst, self.vm.root_cfg_node)
instance.initialize_type_parameter(
get_node(), formal.name, p)
return instance
else:
return self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
elif isinstance(pyval, pytd.GenericType):
assert isinstance(pyval.base_type, pytd.ClassType)
base_cls = self.constant_to_value(pyval.base_type.cls, subst,
self.vm.root_cfg_node)
if not isinstance(base_cls, abstract.Class):
# base_cls can be, e.g., an unsolvable due to an mro error.
return self.unsolvable
if isinstance(pyval, pytd.TupleType):
abstract_class = abstract.TupleClass
template = range(len(pyval.parameters)) + [abstract.T]
parameters = pyval.parameters + (pytd.UnionType(
pyval.parameters), )
elif isinstance(pyval, pytd.CallableType):
abstract_class = abstract.Callable
template = range(len(
pyval.args)) + [abstract.ARGS, abstract.RET]
parameters = pyval.args + (pytd_utils.JoinTypes(
pyval.args), pyval.ret)
else:
abstract_class = abstract.ParameterizedClass
template = tuple(t.name for t in pyval.base_type.cls.template)
parameters = pyval.parameters
assert (pyval.base_type.name == "typing.Generic"
or len(parameters) <= len(template))
type_parameters = utils.LazyDict()
for i, name in enumerate(template):
if i < len(parameters):
type_parameters.add_lazy_item(name, self.constant_to_value,
parameters[i], subst,
self.vm.root_cfg_node)
else:
type_parameters[name] = self.unsolvable
return abstract_class(base_cls, type_parameters, self.vm)
elif pyval.__class__ is tuple: # only match raw tuple, not namedtuple/Node
return self.tuple_to_value([
self.constant_to_var(item, subst, self.vm.root_cfg_node)
for i, item in enumerate(pyval)
])
else:
raise NotImplementedError("Can't convert constant %s %r" %
(type(pyval), pyval))
