def generate_constructor_for_class(cl: ClassIR, fn: FuncDecl, init_fn: Optional[FuncIR], setup_name: str, vtable_name: str, emitter: Emitter) -> None: """Generate a native function that allocates and initializes an instance of a class.""" emitter.emit_line('{}'.format(native_function_header(fn, emitter))) emitter.emit_line('{') emitter.emit_line('PyObject *self = {}({});'.format( setup_name, emitter.type_struct_name(cl))) emitter.emit_line('if (self == NULL)') emitter.emit_line(' return NULL;') args = ', '.join(['self'] + [REG_PREFIX + arg.name for arg in fn.sig.args]) if init_fn is not None: emitter.emit_line('char res = {}{}{}({});'.format( emitter.get_group_prefix(init_fn.decl), NATIVE_PREFIX, init_fn.cname(emitter.names), args)) emitter.emit_line('if (res == 2) {') emitter.emit_line('Py_DECREF(self);') emitter.emit_line('return NULL;') emitter.emit_line('}') # If there is a nontrivial ctor that we didn't define, invoke it via tp_init elif len(fn.sig.args) > 1: emitter.emit_line('int res = {}->tp_init({});'.format( emitter.type_struct_name(cl), args)) emitter.emit_line('if (res < 0) {') emitter.emit_line('Py_DECREF(self);') emitter.emit_line('return NULL;') emitter.emit_line('}') emitter.emit_line('return self;') emitter.emit_line('}')
def generate_function_declaration(fn: FuncIR, emitter: Emitter) -> None: emitter.context.declarations[emitter.native_function_name(fn.decl)] = HeaderDeclaration( '{};'.format(native_function_header(fn.decl, emitter)), needs_export=True) if fn.name != TOP_LEVEL_NAME: emitter.context.declarations[PREFIX + fn.cname(emitter.names)] = HeaderDeclaration( '{};'.format(wrapper_function_header(fn, emitter.names)))
def generate_function_declaration(fn: FuncIR, emitter: Emitter) -> None: emitter.context.declarations[emitter.native_function_name(fn.decl)] = HeaderDeclaration( '{};'.format(native_function_header(fn.decl, emitter)), needs_export=True) if fn.name != TOP_LEVEL_NAME: if is_fastcall_supported(fn, emitter.capi_version): emitter.context.declarations[PREFIX + fn.cname(emitter.names)] = HeaderDeclaration( '{};'.format(wrapper_function_header(fn, emitter.names))) else: emitter.context.declarations[PREFIX + fn.cname(emitter.names)] = HeaderDeclaration( '{};'.format(legacy_wrapper_function_header(fn, emitter.names)))
def generate_class_type_decl(cl: ClassIR, c_emitter: Emitter, external_emitter: Emitter, emitter: Emitter) -> None: context = c_emitter.context name = emitter.type_struct_name(cl) context.declarations[name] = HeaderDeclaration( 'PyTypeObject *{};'.format(emitter.type_struct_name(cl)), needs_export=True) # If this is a non-extension class, all we want is the type object decl. if not cl.is_ext_class: return generate_object_struct(cl, external_emitter) generate_full = not cl.is_trait and not cl.builtin_base if generate_full: context.declarations[emitter.native_function_name(cl.ctor)] = HeaderDeclaration( '{};'.format(native_function_header(cl.ctor, emitter)), needs_export=True, )
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)