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
	284	}		284	}
	285	assert( var_x == NULL );		285	assert( var_x == NULL );
	286	var_x = tmp_assign_source_3;		286	var_x = tmp_assign_source_3;
	287	}		287	}
	288	{		288	{
t	289	PyObject *tmp_all_arg_1;	t
	290	PyObject *tmp_capi_result_1;
	291	CHECK_OBJECT( var_gen );
	292	tmp_all_arg_1 = var_gen;
	293	tmp_capi_result_1 = BUILTIN_ALL( tmp_all_arg_1 );
	294	if ( tmp_capi_result_1 == NULL )
	295	{
	296	assert( ERROR_OCCURRED() );
	297
	298	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	299
	300
	301	exception_lineno = 32;
	302	type_description_1 = "ooo";
	303	goto frame_exception_exit_1;
	304	}
	305	Py_DECREF( tmp_capi_result_1 );
	306	}
	307	{
	308	PyObject *tmp_assign_source_4;		289	PyObject *tmp_assign_source_4;
	309	PyObject *tmp_value_name_2;		290	PyObject *tmp_value_name_2;
	310	CHECK_OBJECT( var_gen );		291	CHECK_OBJECT( var_gen );
	311	tmp_value_name_2 = var_gen;		292	tmp_value_name_2 = var_gen;
	312	tmp_assign_source_4 = ITERATOR_NEXT( tmp_value_name_2 );		293	tmp_assign_source_4 = ITERATOR_NEXT( tmp_value_name_2 );