Construct ClosureVariableAccess

Performance Diagrams

Source Code with Construct

module_value1 = 1000
module_value2 = None
module_value3 = None

def calledRepeatedly():
    closure_value = module_value1

    def f():
        # Force frame and eliminate forward propagation (currently).
        module_value1

        # Use writing to global variable as access method.
        global module_value2, module_value3

# construct_begin
        module_value2 = closure_value
# construct_end

        module_value3 = closure_value

    f()

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

print("OK.")

Source Code without Construct

module_value1 = 1000
module_value2 = None
module_value3 = None

def calledRepeatedly():
    closure_value = module_value1

    def f():
        # Force frame and eliminate forward propagation (currently).
        module_value1

        # Use writing to global variable as access method.
        global module_value2, module_value3

# construct_begin



        module_value3 = closure_value

    f()

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

print("OK.")

Context Diff of Source Code

	Construct			Baseline
	30			30
	31	# Use writing to global variable as access method.		31	# Use writing to global variable as access method.
	32	global module_value2, module_value3		32	global module_value2, module_value3
	33			33
	34	# construct_begin		34	# construct_begin
t	35	module_value2 = closure_value	t	35
	36	# construct_end		36
	37			37
	38	module_value3 = closure_value		38	module_value3 = closure_value
	39			39
	40	f()		40	f()
	41			41

Context Diff of Generated Code

	Construct			Baseline
	394	exception_value = PyUnicode_FromFormat("free variable '%s' referenced before assignment in enclosing scope", "closure_value");		394	exception_value = PyUnicode_FromFormat("free variable '%s' referenced before assignment in enclosing scope", "closure_value");
	395	exception_tb = NULL;		395	exception_tb = NULL;
	396	NORMALIZE_EXCEPTION(&exception_type, &exception_value, &exception_tb);		396	NORMALIZE_EXCEPTION(&exception_type, &exception_value, &exception_tb);
	397	CHAIN_EXCEPTION(exception_value);		397	CHAIN_EXCEPTION(exception_value);
	398			398
n	399	exception_lineno = 35;	n
	400	type_description_1 = "c";
	401	goto frame_exception_exit_1;
	402	}
	403
	404	tmp_assign_source_1 = PyCell_GET(self->m_closure[0]);
	405	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value2, tmp_assign_source_1);
	406	}
	407	{
	408	PyObject *tmp_assign_source_2;
	409	if (PyCell_GET(self->m_closure[0]) == NULL) {
	410
	411	exception_type = PyExc_NameError;
	412	Py_INCREF(exception_type);
	413	exception_value = PyUnicode_FromFormat("free variable '%s' referenced before assignment in enclosing scope", "closure_value");
	414	exception_tb = NULL;
	415	NORMALIZE_EXCEPTION(&exception_type, &exception_value, &exception_tb);
	416	CHAIN_EXCEPTION(exception_value);
	417
	418	exception_lineno = 38;		399	exception_lineno = 38;
	419	type_description_1 = "c";		400	type_description_1 = "c";
	420	goto frame_exception_exit_1;		401	goto frame_exception_exit_1;
	421	}		402	}
	422			403
t	423	tmp_assign_source_2 = PyCell_GET(self->m_closure[0]);	t	404	tmp_assign_source_1 = PyCell_GET(self->m_closure[0]);
	424	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value3, tmp_assign_source_2);		405	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value3, tmp_assign_source_1);
	425	}		406	}
	426			407
	427	#if 0		408	#if 0
	428	RESTORE_FRAME_EXCEPTION(frame_4381a3738a89fa501ec3d01d5ad5d3d0);		409	RESTORE_FRAME_EXCEPTION(frame_4381a3738a89fa501ec3d01d5ad5d3d0);
	429	#endif		410	#endif