Construct GeneratorUsage

Performance Diagrams

Source Code with Construct

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    def generator():
        yield 1
        yield 2
        yield 3

    gen = generator()

    x = next(gen)
# construct_begin
    next(gen)
# construct_end

    return x

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

print("OK.")

Source Code without Construct

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    def generator():
        yield 1
        yield 2
        yield 3

    gen = generator()

    x = next(gen)
# construct_begin



    return x

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

print("OK.")

Context Diff of Source Code

	Construct			Baseline
	29			29
	30	gen = generator()		30	gen = generator()
	31			31
	32	x = next(gen)		32	x = next(gen)
	33	# construct_begin		33	# construct_begin
t	34	next(gen)	t	34
	35	# construct_end		35
	36			36
	37	return x		37	return x
	38			38
	39	import itertools		39	import itertools
	40	for x in itertools.repeat(None, 50000):		40	for x in itertools.repeat(None, 50000):

Context Diff of Generated Code

	Construct			Baseline
	141	NUITKA_MAY_BE_UNUSED char const *type_description_1 = NULL;		141	NUITKA_MAY_BE_UNUSED char const *type_description_1 = NULL;
	142	PyObject *exception_type = NULL;		142	PyObject *exception_type = NULL;
	143	PyObject *exception_value = NULL;		143	PyObject *exception_value = NULL;
	144	PyTracebackObject *exception_tb = NULL;		144	PyTracebackObject *exception_tb = NULL;
	145	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;		145	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;
n	146	NUITKA_MAY_BE_UNUSED PyObject *tmp_unused;	n
	147	static struct Nuitka_FrameObject *cache_frame_5a2c8ebe2db3dd40a2d21d1c1951f266 = NULL;		146	static struct Nuitka_FrameObject *cache_frame_5a2c8ebe2db3dd40a2d21d1c1951f266 = NULL;
	148	PyObject *tmp_return_value = NULL;		147	PyObject *tmp_return_value = NULL;
	149	PyObject *exception_keeper_type_1;		148	PyObject *exception_keeper_type_1;
	150	PyObject *exception_keeper_value_1;		149	PyObject *exception_keeper_value_1;
	151	PyTracebackObject *exception_keeper_tb_1;		150	PyTracebackObject *exception_keeper_tb_1;
	225	}		224	}
	226	assert( var_x == NULL );		225	assert( var_x == NULL );
	227	var_x = tmp_assign_source_3;		226	var_x = tmp_assign_source_3;
	228			227
	229	}		228	}
n	230	{	n
	231	PyObject *tmp_value_name_2;
	232	tmp_value_name_2 = var_gen;
	233
	234	if ( tmp_value_name_2 == NULL )
	235	{
	236
	237	exception_type = PyExc_UnboundLocalError;
	238	Py_INCREF( exception_type );
	239	exception_value = PyUnicode_FromFormat( "local variable '%s' referenced before assignment", "gen" );
	240	exception_tb = NULL;
	241	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	242	CHAIN_EXCEPTION( exception_value );
	243
	244	exception_lineno = 34;
	245	type_description_1 = "ooo";
	246	goto frame_exception_exit_1;
	247	}
	248
	249	tmp_unused = ITERATOR_NEXT( tmp_value_name_2 );
	250	if ( tmp_unused == NULL )
	251	{
	252	if ( !ERROR_OCCURRED() )
	253	{
	254	exception_type = PyExc_StopIteration;
	255	Py_INCREF( exception_type );
	256	exception_value = NULL;
	257	exception_tb = NULL;
	258	}
	259	else
	260	{
	261	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	262	}
	263
	264
	265	type_description_1 = "ooo";
	266	exception_lineno = 34;
	267	goto frame_exception_exit_1;
	268	}
	269	Py_DECREF( tmp_unused );
	270	}
	271			229
	272	#if 0		230	#if 0
	273	RESTORE_FRAME_EXCEPTION( frame_5a2c8ebe2db3dd40a2d21d1c1951f266 );		231	RESTORE_FRAME_EXCEPTION( frame_5a2c8ebe2db3dd40a2d21d1c1951f266 );
	274	#endif		232	#endif
	275			233
	321	frame_no_exception_1:;		279	frame_no_exception_1:;
	322			280
	323	{		281	{
	324	tmp_return_value = var_x;		282	tmp_return_value = var_x;
	325			283
n	326	if ( tmp_return_value == NULL )	n	284	CHECK_OBJECT( tmp_return_value );
	327	{
	328
	329	exception_type = PyExc_UnboundLocalError;
	330	Py_INCREF( exception_type );
	331	exception_value = PyUnicode_FromFormat( "local variable '%s' referenced before assignment", "x" );
	332	exception_tb = NULL;
	333	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	334	CHAIN_EXCEPTION( exception_value );
	335
	336
	337
	338	goto try_except_handler_1;
	339	}
	340
	341	Py_INCREF( tmp_return_value );		285	Py_INCREF( tmp_return_value );
	342	goto try_return_handler_1;		286	goto try_return_handler_1;
	343	}		287	}
	344	// tried codes exits in all cases		288	// tried codes exits in all cases
	345	NUITKA_CANNOT_GET_HERE( __main__$$$function_1_calledRepeatedly );		289	NUITKA_CANNOT_GET_HERE( __main__$$$function_1_calledRepeatedly );
	376	exception_lineno = 0;		320	exception_lineno = 0;
	377			321
	378	{		322	{
	379	Py_XDECREF( var_gen );		323	Py_XDECREF( var_gen );
	380	var_gen = NULL;		324	var_gen = NULL;
t	381		t
	382	}
	383	{
	384	Py_XDECREF( var_x );
	385	var_x = NULL;
	386			325
	387	}		326	}
	388	{		327	{
	389	Py_XDECREF( var_generator );		328	Py_XDECREF( var_generator );
	390	var_generator = NULL;		329	var_generator = NULL;