def generate_call_wrapper(cl: ClassIR, fn: FuncIR, emitter: Emitter) -> str:
if emitter.use_vectorcall():
# Use vectorcall wrapper if supported (PEP 590).
return 'PyVectorcall_Call'
else:
# On older Pythons use the legacy wrapper.
return wrapper_slot(cl, fn, emitter)
def generate_object_struct(cl: ClassIR, emitter: Emitter) -> None:
seen_attrs: Set[Tuple[str, RType]] = set()
lines: List[str] = []
lines += ['typedef struct {',
'PyObject_HEAD',
'CPyVTableItem *vtable;']
if cl.has_method('__call__') and emitter.use_vectorcall():
lines.append('vectorcallfunc vectorcall;')
for base in reversed(cl.base_mro):
if not base.is_trait:
for attr, rtype in base.attributes.items():
if (attr, rtype) not in seen_attrs:
lines.append('{}{};'.format(emitter.ctype_spaced(rtype),
emitter.attr(attr)))
seen_attrs.add((attr, rtype))
if isinstance(rtype, RTuple):
emitter.declare_tuple_struct(rtype)
lines.append('}} {};'.format(cl.struct_name(emitter.names)))
lines.append('')
emitter.context.declarations[cl.struct_name(emitter.names)] = HeaderDeclaration(
lines,
is_type=True
)
def generate_setup_for_class(cl: ClassIR,
func_name: str,
defaults_fn: Optional[FuncIR],
vtable_name: str,
shadow_vtable_name: Optional[str],
emitter: Emitter) -> None:
"""Generate a native function that allocates an instance of a class."""
emitter.emit_line('static PyObject *')
emitter.emit_line('{}(PyTypeObject *type)'.format(func_name))
emitter.emit_line('{')
emitter.emit_line('{} *self;'.format(cl.struct_name(emitter.names)))
emitter.emit_line('self = ({struct} *)type->tp_alloc(type, 0);'.format(
struct=cl.struct_name(emitter.names)))
emitter.emit_line('if (self == NULL)')
emitter.emit_line(' return NULL;')
if shadow_vtable_name:
emitter.emit_line('if (type != {}) {{'.format(emitter.type_struct_name(cl)))
emitter.emit_line('self->vtable = {};'.format(shadow_vtable_name))
emitter.emit_line('} else {')
emitter.emit_line('self->vtable = {};'.format(vtable_name))
emitter.emit_line('}')
else:
emitter.emit_line('self->vtable = {};'.format(vtable_name))
if cl.has_method('__call__') and emitter.use_vectorcall():
name = cl.method_decl('__call__').cname(emitter.names)
emitter.emit_line('self->vectorcall = {}{};'.format(PREFIX, name))
for base in reversed(cl.base_mro):
for attr, rtype in base.attributes.items():
emitter.emit_line('self->{} = {};'.format(
emitter.attr(attr), emitter.c_undefined_value(rtype)))
# Initialize attributes to default values, if necessary
if defaults_fn is not None:
emitter.emit_lines(
'if ({}{}((PyObject *)self) == 0) {{'.format(
NATIVE_PREFIX, defaults_fn.cname(emitter.names)),
'Py_DECREF(self);',
'return NULL;',
'}')
emitter.emit_line('return (PyObject *)self;')
emitter.emit_line('}')
def generate_class(cl: ClassIR, module: str, emitter: Emitter) -> None:
"""Generate C code for a class.
This is the main entry point to the module.
"""
name = cl.name
name_prefix = cl.name_prefix(emitter.names)
setup_name = '{}_setup'.format(name_prefix)
new_name = '{}_new'.format(name_prefix)
members_name = '{}_members'.format(name_prefix)
getseters_name = '{}_getseters'.format(name_prefix)
vtable_name = '{}_vtable'.format(name_prefix)
traverse_name = '{}_traverse'.format(name_prefix)
clear_name = '{}_clear'.format(name_prefix)
dealloc_name = '{}_dealloc'.format(name_prefix)
methods_name = '{}_methods'.format(name_prefix)
vtable_setup_name = '{}_trait_vtable_setup'.format(name_prefix)
fields: Dict[str, str] = OrderedDict()
fields['tp_name'] = '"{}"'.format(name)
generate_full = not cl.is_trait and not cl.builtin_base
needs_getseters = cl.needs_getseters or not cl.is_generated
if not cl.builtin_base:
fields['tp_new'] = new_name
if generate_full:
fields['tp_dealloc'] = '(destructor){}_dealloc'.format(name_prefix)
fields['tp_traverse'] = '(traverseproc){}_traverse'.format(name_prefix)
fields['tp_clear'] = '(inquiry){}_clear'.format(name_prefix)
if needs_getseters:
fields['tp_getset'] = getseters_name
fields['tp_methods'] = methods_name
def emit_line() -> None:
emitter.emit_line()
emit_line()
# If the class has a method to initialize default attribute
# values, we need to call it during initialization.
defaults_fn = cl.get_method('__mypyc_defaults_setup')
# If there is a __init__ method, we'll use it in the native constructor.
init_fn = cl.get_method('__init__')
# Fill out slots in the type object from dunder methods.
fields.update(generate_slots(cl, SLOT_DEFS, emitter))
# Fill out dunder methods that live in tables hanging off the side.
for table_name, type, slot_defs in SIDE_TABLES:
slots = generate_slots(cl, slot_defs, emitter)
if slots:
table_struct_name = generate_side_table_for_class(
cl, table_name, type, slots, emitter)
fields['tp_{}'.format(table_name)] = '&{}'.format(
table_struct_name)
richcompare_name = generate_richcompare_wrapper(cl, emitter)
if richcompare_name:
fields['tp_richcompare'] = richcompare_name
# If the class inherits from python, make space for a __dict__
struct_name = cl.struct_name(emitter.names)
if cl.builtin_base:
base_size = 'sizeof({})'.format(cl.builtin_base)
elif cl.is_trait:
base_size = 'sizeof(PyObject)'
else:
base_size = 'sizeof({})'.format(struct_name)
# Since our types aren't allocated using type() we need to
# populate these fields ourselves if we want them to have correct
# values. PyType_Ready will inherit the offsets from tp_base but
# that isn't what we want.
# XXX: there is no reason for the __weakref__ stuff to be mixed up with __dict__
if cl.has_dict:
# __dict__ lives right after the struct and __weakref__ lives right after that
# TODO: They should get members in the struct instead of doing this nonsense.
weak_offset = '{} + sizeof(PyObject *)'.format(base_size)
emitter.emit_lines(
'PyMemberDef {}[] = {{'.format(members_name),
'{{"__dict__", T_OBJECT_EX, {}, 0, NULL}},'.format(base_size),
'{{"__weakref__", T_OBJECT_EX, {}, 0, NULL}},'.format(weak_offset),
'{0}',
'};',
)
fields['tp_members'] = members_name
fields['tp_basicsize'] = '{} + 2*sizeof(PyObject *)'.format(base_size)
fields['tp_dictoffset'] = base_size
fields['tp_weaklistoffset'] = weak_offset
else:
fields['tp_basicsize'] = base_size
if generate_full:
# Declare setup method that allocates and initializes an object. type is the
# type of the class being initialized, which could be another class if there
# is an interpreted subclass.
emitter.emit_line(
'static PyObject *{}(PyTypeObject *type);'.format(setup_name))
assert cl.ctor is not None
emitter.emit_line(native_function_header(cl.ctor, emitter) + ';')
emit_line()
generate_new_for_class(cl, new_name, vtable_name, setup_name, emitter)
emit_line()
generate_traverse_for_class(cl, traverse_name, emitter)
emit_line()
generate_clear_for_class(cl, clear_name, emitter)
emit_line()
generate_dealloc_for_class(cl, dealloc_name, clear_name, emitter)
emit_line()
if cl.allow_interpreted_subclasses:
shadow_vtable_name: Optional[str] = generate_vtables(
cl,
vtable_setup_name + "_shadow",
vtable_name + "_shadow",
emitter,
shadow=True)
emit_line()
else:
shadow_vtable_name = None
vtable_name = generate_vtables(cl,
vtable_setup_name,
vtable_name,
emitter,
shadow=False)
emit_line()
if needs_getseters:
generate_getseter_declarations(cl, emitter)
emit_line()
generate_getseters_table(cl, getseters_name, emitter)
emit_line()
if cl.is_trait:
generate_new_for_trait(cl, new_name, emitter)
generate_methods_table(cl, methods_name, emitter)
emit_line()
flags = [
'Py_TPFLAGS_DEFAULT', 'Py_TPFLAGS_HEAPTYPE', 'Py_TPFLAGS_BASETYPE'
]
if generate_full:
flags.append('Py_TPFLAGS_HAVE_GC')
if cl.has_method('__call__') and emitter.use_vectorcall():
fields['tp_vectorcall_offset'] = 'offsetof({}, vectorcall)'.format(
cl.struct_name(emitter.names))
flags.append('_Py_TPFLAGS_HAVE_VECTORCALL')
fields['tp_flags'] = ' | '.join(flags)
emitter.emit_line("static PyTypeObject {}_template_ = {{".format(
emitter.type_struct_name(cl)))
emitter.emit_line("PyVarObject_HEAD_INIT(NULL, 0)")
for field, value in fields.items():
emitter.emit_line(".{} = {},".format(field, value))
emitter.emit_line("};")
emitter.emit_line(
"static PyTypeObject *{t}_template = &{t}_template_;".format(
t=emitter.type_struct_name(cl)))
emitter.emit_line()
if generate_full:
generate_setup_for_class(cl, setup_name, defaults_fn, vtable_name,
shadow_vtable_name, emitter)
emitter.emit_line()
generate_constructor_for_class(cl, cl.ctor, init_fn, setup_name,
vtable_name, emitter)
emitter.emit_line()
if needs_getseters:
generate_getseters(cl, emitter)