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
	45	extern PyObject *const_int_0;		45	extern PyObject *const_int_0;
	46	extern PyObject *const_str_plain_print;		46	extern PyObject *const_str_plain_print;
	47	static PyObject *const_int_pos_50000;		47	static PyObject *const_int_pos_50000;
	48	static PyObject *const_str_plain_gen;		48	static PyObject *const_str_plain_gen;
	49	static PyObject *const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple;		49	static PyObject *const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple;
n	50	static PyObject *const_str_plain_all;	n
	51	static PyObject *const_str_plain_calledRepeatedly;		50	static PyObject *const_str_plain_calledRepeatedly;
	52	static PyObject *const_str_angle_module;		51	static PyObject *const_str_angle_module;
	53	static PyObject *const_str_plain_None;		52	static PyObject *const_str_plain_None;
	54	static PyObject *const_str_plain_x;		53	static PyObject *const_str_plain_x;
	55	extern PyObject *const_tuple_empty;		54	extern PyObject *const_tuple_empty;
	90	const_int_pos_50000 = PyLong_FromUnsignedLong( 50000ul );		89	const_int_pos_50000 = PyLong_FromUnsignedLong( 50000ul );
	91	const_str_plain_gen = UNSTREAM_STRING_ASCII( &constant_bin[ 27 ], 3, 1 );		90	const_str_plain_gen = UNSTREAM_STRING_ASCII( &constant_bin[ 27 ], 3, 1 );
	92	const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple = PyTuple_New( 1 );		91	const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple = PyTuple_New( 1 );
	93	const_str_digest_5ed1392909ad16e6227b8230f4582352 = UNSTREAM_STRING_ASCII( &constant_bin[ 133 ], 3, 0 );		92	const_str_digest_5ed1392909ad16e6227b8230f4582352 = UNSTREAM_STRING_ASCII( &constant_bin[ 133 ], 3, 0 );
	94	PyTuple_SET_ITEM( const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple, 0, const_str_digest_5ed1392909ad16e6227b8230f4582352 ); Py_INCREF( const_str_digest_5ed1392909ad16e6227b8230f4582352 );		93	PyTuple_SET_ITEM( const_tuple_str_digest_5ed1392909ad16e6227b8230f4582352_tuple, 0, const_str_digest_5ed1392909ad16e6227b8230f4582352 ); Py_INCREF( const_str_digest_5ed1392909ad16e6227b8230f4582352 );
n	95	const_str_plain_all = UNSTREAM_STRING_ASCII( &constant_bin[ 1 ], 3, 1 );	n
	96	const_str_plain_calledRepeatedly = UNSTREAM_STRING_ASCII( &constant_bin[ 0 ], 16, 1 );		94	const_str_plain_calledRepeatedly = UNSTREAM_STRING_ASCII( &constant_bin[ 0 ], 16, 1 );
	97	const_str_angle_module = UNSTREAM_STRING_ASCII( &constant_bin[ 136 ], 8, 0 );		95	const_str_angle_module = UNSTREAM_STRING_ASCII( &constant_bin[ 136 ], 8, 0 );
	98	const_str_plain_None = UNSTREAM_STRING_ASCII( &constant_bin[ 144 ], 4, 1 );		96	const_str_plain_None = UNSTREAM_STRING_ASCII( &constant_bin[ 144 ], 4, 1 );
	99	const_str_plain_x = UNSTREAM_STRING_ASCII( &constant_bin[ 31 ], 1, 1 );		97	const_str_plain_x = UNSTREAM_STRING_ASCII( &constant_bin[ 31 ], 1, 1 );
	100	const_str_plain_repeat = UNSTREAM_STRING_ASCII( &constant_bin[ 148 ], 6, 1 );		98	const_str_plain_repeat = UNSTREAM_STRING_ASCII( &constant_bin[ 148 ], 6, 1 );
	298	assert( var_x == NULL );		296	assert( var_x == NULL );
	299	var_x = tmp_assign_source_3;		297	var_x = tmp_assign_source_3;
	300			298
	301	}		299	}
	302	{		300	{
t	303	PyObject *tmp_called_name_1;	t
	304	PyObject *tmp_call_result_1;
	305	PyObject *tmp_args_element_name_1;
	306	tmp_called_name_1 = LOOKUP_BUILTIN( const_str_plain_all );
	307	assert( tmp_called_name_1 != NULL );
	308	if ( var_gen == NULL )
	309	{
	310
	311	exception_type = PyExc_UnboundLocalError;
	312	Py_INCREF( exception_type );
	313	exception_value = PyUnicode_FromFormat( "local variable '%s' referenced before assignment", "gen" );
	314	exception_tb = NULL;
	315	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	316	CHAIN_EXCEPTION( exception_value );
	317
	318	exception_lineno = 32;
	319	type_description_1 = "ooo";
	320	goto frame_exception_exit_1;
	321	}
	322
	323	tmp_args_element_name_1 = var_gen;
	324	frame_fcbb8588139b63d6d9d1299e01041008->m_frame.f_lineno = 32;
	325	{
	326	PyObject *call_args[] = { tmp_args_element_name_1 };
	327	tmp_call_result_1 = CALL_FUNCTION_WITH_ARGS1( tmp_called_name_1, call_args );
	328	}
	329
	330	if ( tmp_call_result_1 == NULL )
	331	{
	332	assert( ERROR_OCCURRED() );
	333
	334	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	335
	336
	337	exception_lineno = 32;
	338	type_description_1 = "ooo";
	339	goto frame_exception_exit_1;
	340	}
	341	Py_DECREF( tmp_call_result_1 );
	342	}
	343	{
	344	PyObject *tmp_assign_source_4;		301	PyObject *tmp_assign_source_4;
	345	PyObject *tmp_value_name_2;		302	PyObject *tmp_value_name_2;
	346	if ( var_gen == NULL )		303	if ( var_gen == NULL )
	347	{		304	{
	348			305