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

for x in xrange(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

for x in xrange(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	static PyObject *const_xrange_0_50000;		46	static PyObject *const_xrange_0_50000;
	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;
	87	const_xrange_0_50000 = BUILTIN_XRANGE3( const_int_0, const_int_pos_50000, const_int_pos_1 );		86	const_xrange_0_50000 = BUILTIN_XRANGE3( const_int_0, const_int_pos_50000, const_int_pos_1 );
	88	const_str_plain_gen = UNSTREAM_STRING( &constant_bin[ 27 ], 3, 1 );		87	const_str_plain_gen = UNSTREAM_STRING( &constant_bin[ 27 ], 3, 1 );
	89	const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple = PyTuple_New( 1 );		88	const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple = PyTuple_New( 1 );
	90	const_str_digest_5ed1392909ad16e6227b8230f4582352 = UNSTREAM_STRING( &constant_bin[ 137 ], 3, 0 );		89	const_str_digest_5ed1392909ad16e6227b8230f4582352 = UNSTREAM_STRING( &constant_bin[ 137 ], 3, 0 );
	91	PyTuple_SET_ITEM( const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple, 0, const_str_digest_5ed1392909ad16e6227b8230f4582352 ); Py_INCREF( const_str_digest_5ed1392909ad16e6227b8230f4582352 );		90	PyTuple_SET_ITEM( const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple, 0, const_str_digest_5ed1392909ad16e6227b8230f4582352 ); Py_INCREF( const_str_digest_5ed1392909ad16e6227b8230f4582352 );
n	92	const_str_plain_all = UNSTREAM_STRING( &constant_bin[ 1 ], 3, 1 );	n
	93	const_str_plain_calledRepeatedly = UNSTREAM_STRING( &constant_bin[ 0 ], 16, 1 );		91	const_str_plain_calledRepeatedly = UNSTREAM_STRING( &constant_bin[ 0 ], 16, 1 );
	94	const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple = PyTuple_New( 3 );		92	const_tuple_str_plain_gen_str_plain_x_str_plain_y_tuple = PyTuple_New( 3 );
	95	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 );		93	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 );
	96	const_str_plain_x = UNSTREAM_STRING( &constant_bin[ 31 ], 1, 1 );		94	const_str_plain_x = UNSTREAM_STRING( &constant_bin[ 31 ], 1, 1 );
	97	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 );		95	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 );
	155	NUITKA_MAY_BE_UNUSED int exception_lineno = -1;		153	NUITKA_MAY_BE_UNUSED int exception_lineno = -1;
	156	PyObject *exception_keeper_type_1;		154	PyObject *exception_keeper_type_1;
	157	PyObject *exception_keeper_value_1;		155	PyObject *exception_keeper_value_1;
	158	PyTracebackObject *exception_keeper_tb_1;		156	PyTracebackObject *exception_keeper_tb_1;
	159	NUITKA_MAY_BE_UNUSED int exception_keeper_lineno_1;		157	NUITKA_MAY_BE_UNUSED int exception_keeper_lineno_1;
n	160	PyObject *tmp_args_element_name_1;	n
	161	PyObject *tmp_assign_source_1;		158	PyObject *tmp_assign_source_1;
	162	PyObject *tmp_assign_source_2;		159	PyObject *tmp_assign_source_2;
	163	PyObject *tmp_assign_source_3;		160	PyObject *tmp_assign_source_3;
	164	PyObject *tmp_assign_source_4;		161	PyObject *tmp_assign_source_4;
n	165	PyObject *tmp_called_name_1;	n
	166	PyObject *tmp_iter_arg_1;		162	PyObject *tmp_iter_arg_1;
	167	PyObject *tmp_outline_return_value_1;		163	PyObject *tmp_outline_return_value_1;
	168	PyObject *tmp_return_value;		164	PyObject *tmp_return_value;
	169	PyObject *tmp_tuple_element_1;		165	PyObject *tmp_tuple_element_1;
n	170	NUITKA_MAY_BE_UNUSED PyObject *tmp_unused;	n
	171	PyObject *tmp_value_name_1;		166	PyObject *tmp_value_name_1;
	172	PyObject *tmp_value_name_2;		167	PyObject *tmp_value_name_2;
	173	static struct Nuitka_FrameObject *cache_frame_b9dad79ddb5562bbe0cf486342efafb3 = NULL;		168	static struct Nuitka_FrameObject *cache_frame_b9dad79ddb5562bbe0cf486342efafb3 = NULL;
	174			169
	175	struct Nuitka_FrameObject *frame_b9dad79ddb5562bbe0cf486342efafb3;		170	struct Nuitka_FrameObject *frame_b9dad79ddb5562bbe0cf486342efafb3;
	291	goto frame_exception_exit_1;		286	goto frame_exception_exit_1;
	292	}		287	}
	293	assert( var_x == NULL );		288	assert( var_x == NULL );
	294	var_x = tmp_assign_source_3;		289	var_x = tmp_assign_source_3;
	295			290
t	296	tmp_called_name_1 = LOOKUP_BUILTIN( const_str_plain_all );	t
	297	assert( tmp_called_name_1 != NULL );
	298	tmp_args_element_name_1 = var_gen;
	299
	300	if ( tmp_args_element_name_1 == NULL )
	301	{
	302
	303	exception_type = PyExc_UnboundLocalError;
	304	Py_INCREF( exception_type );
	305	exception_value = PyUnicode_FromFormat( "local variable '%s' referenced before assignment", "gen" );
	306	exception_tb = NULL;
	307	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	308	CHAIN_EXCEPTION( exception_value );
	309
	310	exception_lineno = 32;
	311	type_description = "ooo";
	312	goto frame_exception_exit_1;
	313	}
	314
	315	frame_b9dad79ddb5562bbe0cf486342efafb3->m_frame.f_lineno = 32;
	316	{
	317	PyObject *call_args[] = { tmp_args_element_name_1 };
	318	tmp_unused = CALL_FUNCTION_WITH_ARGS1( tmp_called_name_1, call_args );
	319	}
	320
	321	if ( tmp_unused == NULL )
	322	{
	323	assert( ERROR_OCCURRED() );
	324
	325	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	326
	327
	328	exception_lineno = 32;
	329	type_description = "ooo";
	330	goto frame_exception_exit_1;
	331	}
	332	Py_DECREF( tmp_unused );
	333	tmp_value_name_2 = var_gen;		291	tmp_value_name_2 = var_gen;
	334			292
	335	if ( tmp_value_name_2 == NULL )		293	if ( tmp_value_name_2 == NULL )
	336	{		294	{
	337			295