Construct GeneratorExpressionUsage

Performance Diagrams

Source Code with Construct

not_all = [1,1,1,1,1,1,1,1,0,1]

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    gen = (x for x in not_all)

    # make sure it is started.
    x = next(gen)

    # This should abort.
# construct_begin
    all(gen)
# construct_end

    # make sure it is still running.
    y = next(gen)

    return x, y

import itertools
for x in itertools.repeat(None, 50000):
    calledRepeatedly()

print("OK.")

Source Code without Construct

not_all = [1,1,1,1,1,1,1,1,0,1]

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    gen = (x for x in not_all)

    # make sure it is started.
    x = next(gen)

    # This should abort.
# construct_begin



    # make sure it is still running.
    y = next(gen)

    return x, y

import itertools
for x in itertools.repeat(None, 50000):
    calledRepeatedly()

print("OK.")

Context Diff of Source Code

	Construct			Baseline
	27	# make sure it is started.		27	# make sure it is started.
	28	x = next(gen)		28	x = next(gen)
	29			29
	30	# This should abort.		30	# This should abort.
	31	# construct_begin		31	# construct_begin
t	32	all(gen)	t	32
	33	# construct_end		33
	34			34
	35	# make sure it is still running.		35	# make sure it is still running.
	36	y = next(gen)		36	y = next(gen)
	37			37
	38	return x, y		38	return x, y

Context Diff of Generated Code

	Construct			Baseline
	46	extern PyObject *const_int_0;		46	extern PyObject *const_int_0;
	47	extern PyObject *const_str_plain_print;		47	extern PyObject *const_str_plain_print;
	48	static PyObject *const_int_pos_50000;		48	static PyObject *const_int_pos_50000;
	49	static PyObject *const_str_plain_gen;		49	static PyObject *const_str_plain_gen;
	50	static PyObject *const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple;		50	static PyObject *const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple;
n	51	static PyObject *const_str_plain_all;	n
	52	static PyObject *const_str_plain_calledRepeatedly;		51	static PyObject *const_str_plain_calledRepeatedly;
	53	static PyObject *const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple;		52	static PyObject *const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple;
	54	static PyObject *const_str_angle_module;		53	static PyObject *const_str_angle_module;
	55	static PyObject *const_str_plain_x;		54	static PyObject *const_str_plain_x;
	56	extern PyObject *const_tuple_empty;		55	extern PyObject *const_tuple_empty;
	91	const_int_pos_50000 = PyLong_FromUnsignedLong( 50000ul );		90	const_int_pos_50000 = PyLong_FromUnsignedLong( 50000ul );
	92	const_str_plain_gen = UNSTREAM_STRING( &constant_bin[ 27 ], 3, 1 );		91	const_str_plain_gen = UNSTREAM_STRING( &constant_bin[ 27 ], 3, 1 );
	93	const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple = PyTuple_New( 1 );		92	const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple = PyTuple_New( 1 );
	94	const_str_digest_5ed1392909ad16e6227b8230f4582352 = UNSTREAM_STRING( &constant_bin[ 72 ], 3, 0 );		93	const_str_digest_5ed1392909ad16e6227b8230f4582352 = UNSTREAM_STRING( &constant_bin[ 72 ], 3, 0 );
	95	PyTuple_SET_ITEM( const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple, 0, const_str_digest_5ed1392909ad16e6227b8230f4582352 ); Py_INCREF( const_str_digest_5ed1392909ad16e6227b8230f4582352 );		94	PyTuple_SET_ITEM( const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple, 0, const_str_digest_5ed1392909ad16e6227b8230f4582352 ); Py_INCREF( const_str_digest_5ed1392909ad16e6227b8230f4582352 );
n	96	const_str_plain_all = UNSTREAM_STRING( &constant_bin[ 1 ], 3, 1 );	n
	97	const_str_plain_calledRepeatedly = UNSTREAM_STRING( &constant_bin[ 0 ], 16, 1 );		95	const_str_plain_calledRepeatedly = UNSTREAM_STRING( &constant_bin[ 0 ], 16, 1 );
	98	const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple = PyTuple_New( 3 );		96	const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple = PyTuple_New( 3 );
	99	PyTuple_SET_ITEM( const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple, 0, const_str_plain_gen ); Py_INCREF( const_str_plain_gen );		97	PyTuple_SET_ITEM( const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple, 0, const_str_plain_gen ); Py_INCREF( const_str_plain_gen );
	100	const_str_plain_x = UNSTREAM_STRING( &constant_bin[ 31 ], 1, 1 );		98	const_str_plain_x = UNSTREAM_STRING( &constant_bin[ 31 ], 1, 1 );
	101	PyTuple_SET_ITEM( const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple, 1, const_str_plain_x ); Py_INCREF( const_str_plain_x );		99	PyTuple_SET_ITEM( const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple, 1, const_str_plain_x ); Py_INCREF( const_str_plain_x );
	169	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;		167	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;
	170	PyObject *exception_keeper_type_1;		168	PyObject *exception_keeper_type_1;
	171	PyObject *exception_keeper_value_1;		169	PyObject *exception_keeper_value_1;
	172	PyTracebackObject *exception_keeper_tb_1;		170	PyTracebackObject *exception_keeper_tb_1;
	173	NUITKA_MAY_BE_UNUSED int exception_keeper_lineno_1;		171	NUITKA_MAY_BE_UNUSED int exception_keeper_lineno_1;
n	174	PyObject *tmp_args_element_name_1;	n
	175	PyObject *tmp_assign_source_1;		172	PyObject *tmp_assign_source_1;
	176	PyObject *tmp_assign_source_2;		173	PyObject *tmp_assign_source_2;
	177	PyObject *tmp_assign_source_3;		174	PyObject *tmp_assign_source_3;
	178	PyObject *tmp_assign_source_4;		175	PyObject *tmp_assign_source_4;
n	179	PyObject *tmp_called_name_1;	n
	180	PyObject *tmp_iter_arg_1;		176	PyObject *tmp_iter_arg_1;
	181	PyObject *tmp_outline_return_value_1;		177	PyObject *tmp_outline_return_value_1;
	182	PyObject *tmp_return_value;		178	PyObject *tmp_return_value;
	183	PyObject *tmp_tuple_element_1;		179	PyObject *tmp_tuple_element_1;
n	184	NUITKA_MAY_BE_UNUSED PyObject *tmp_unused;	n
	185	PyObject *tmp_value_name_1;		180	PyObject *tmp_value_name_1;
	186	PyObject *tmp_value_name_2;		181	PyObject *tmp_value_name_2;
	187	static struct Nuitka_FrameObject *cache_frame_b4f6b91718750351551f8f757254eda6 = NULL;		182	static struct Nuitka_FrameObject *cache_frame_b4f6b91718750351551f8f757254eda6 = NULL;
	188			183
	189	struct Nuitka_FrameObject *frame_b4f6b91718750351551f8f757254eda6;		184	struct Nuitka_FrameObject *frame_b4f6b91718750351551f8f757254eda6;
	305	goto frame_exception_exit_1;		300	goto frame_exception_exit_1;
	306	}		301	}
	307	assert( var_x == NULL );		302	assert( var_x == NULL );
	308	var_x = tmp_assign_source_3;		303	var_x = tmp_assign_source_3;
	309			304
t	310	tmp_called_name_1 = LOOKUP_BUILTIN( const_str_plain_all );	t
	311	assert( tmp_called_name_1 != NULL );
	312	tmp_args_element_name_1 = var_gen;
	313
	314	if ( tmp_args_element_name_1 == NULL )
	315	{
	316
	317	exception_type = PyExc_UnboundLocalError;
	318	Py_INCREF( exception_type );
	319	exception_value = PyUnicode_FromFormat( "local variable '%s' referenced before assignment", "gen" );
	320	exception_tb = NULL;
	321	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	322	CHAIN_EXCEPTION( exception_value );
	323
	324	exception_lineno = 32;
	325	type_description = "ooo";
	326	goto frame_exception_exit_1;
	327	}
	328
	329	frame_b4f6b91718750351551f8f757254eda6->m_frame.f_lineno = 32;
	330	{
	331	PyObject *call_args[] = { tmp_args_element_name_1 };
	332	tmp_unused = CALL_FUNCTION_WITH_ARGS1( tmp_called_name_1, call_args );
	333	}
	334
	335	if ( tmp_unused == NULL )
	336	{
	337	assert( ERROR_OCCURRED() );
	338
	339	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	340
	341
	342	exception_lineno = 32;
	343	type_description = "ooo";
	344	goto frame_exception_exit_1;
	345	}
	346	Py_DECREF( tmp_unused );
	347	tmp_value_name_2 = var_gen;		305	tmp_value_name_2 = var_gen;
	348			306
	349	if ( tmp_value_name_2 == NULL )		307	if ( tmp_value_name_2 == NULL )
	350	{		308	{
	351			309