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
	400	exception_value = PyUnicode_FromFormat( "free variable '%s' referenced before assignment in enclosing scope", "closure_value" );		400	exception_value = PyUnicode_FromFormat( "free variable '%s' referenced before assignment in enclosing scope", "closure_value" );
	401	exception_tb = NULL;		401	exception_tb = NULL;
	402	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );		402	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	403	CHAIN_EXCEPTION( exception_value );		403	CHAIN_EXCEPTION( exception_value );
	404			404
n	405	exception_lineno = 35;	n
	406	type_description_1 = "c";
	407	goto frame_exception_exit_1;
	408	}
	409
	410	tmp_assign_source_1 = PyCell_GET( self->m_closure[0] );
	411	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value2, tmp_assign_source_1);
	412	}
	413	{
	414	PyObject *tmp_assign_source_2;
	415	if ( PyCell_GET( self->m_closure[0] ) == NULL )
	416	{
	417
	418	exception_type = PyExc_NameError;
	419	Py_INCREF(exception_type);
	420	exception_value = PyUnicode_FromFormat( "free variable '%s' referenced before assignment in enclosing scope", "closure_value" );
	421	exception_tb = NULL;
	422	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	423	CHAIN_EXCEPTION( exception_value );
	424
	425	exception_lineno = 38;		405	exception_lineno = 38;
	426	type_description_1 = "c";		406	type_description_1 = "c";
	427	goto frame_exception_exit_1;		407	goto frame_exception_exit_1;
	428	}		408	}
	429			409
t	430	tmp_assign_source_2 = PyCell_GET( self->m_closure[0] );	t	410	tmp_assign_source_1 = PyCell_GET( self->m_closure[0] );
	431	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value3, tmp_assign_source_2);		411	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value3, tmp_assign_source_1);
	432	}		412	}
	433			413
	434	#if 0		414	#if 0
	435	RESTORE_FRAME_EXCEPTION(frame_74bf81c2dd25d43a5180888aa101f0f4);		415	RESTORE_FRAME_EXCEPTION(frame_74bf81c2dd25d43a5180888aa101f0f4);
	436	#endif		416	#endif