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
	406	exception_value = PyUnicode_FromFormat( "free variable '%s' referenced before assignment in enclosing scope", "closure_value" );		406	exception_value = PyUnicode_FromFormat( "free variable '%s' referenced before assignment in enclosing scope", "closure_value" );
	407	exception_tb = NULL;		407	exception_tb = NULL;
	408	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );		408	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	409	CHAIN_EXCEPTION( exception_value );		409	CHAIN_EXCEPTION( exception_value );
	410			410
n	411	exception_lineno = 35;	n
	412	type_description_1 = "c";
	413	goto frame_exception_exit_1;
	414	}
	415
	416	tmp_assign_source_1 = PyCell_GET( self->m_closure[0] );
	417	UPDATE_STRING_DICT0( moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value2, tmp_assign_source_1 );
	418	}
	419	{
	420	PyObject *tmp_assign_source_2;
	421	if ( PyCell_GET( self->m_closure[0] ) == NULL )
	422	{
	423
	424	exception_type = PyExc_NameError;
	425	Py_INCREF( exception_type );
	426	exception_value = PyUnicode_FromFormat( "free variable '%s' referenced before assignment in enclosing scope", "closure_value" );
	427	exception_tb = NULL;
	428	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	429	CHAIN_EXCEPTION( exception_value );
	430
	431	exception_lineno = 38;		411	exception_lineno = 38;
	432	type_description_1 = "c";		412	type_description_1 = "c";
	433	goto frame_exception_exit_1;		413	goto frame_exception_exit_1;
	434	}		414	}
	435			415
t	436	tmp_assign_source_2 = PyCell_GET( self->m_closure[0] );	t	416	tmp_assign_source_1 = PyCell_GET( self->m_closure[0] );
	437	UPDATE_STRING_DICT0( moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value3, tmp_assign_source_2 );		417	UPDATE_STRING_DICT0( moduledict___main__, (Nuitka_StringObject *)const_str_plain_module_value3, tmp_assign_source_1 );
	438	}		418	}
	439			419
	440	#if 0		420	#if 0
	441	RESTORE_FRAME_EXCEPTION( frame_48418d475439071e9d7c2d29037a017a );		421	RESTORE_FRAME_EXCEPTION( frame_48418d475439071e9d7c2d29037a017a );
	442	#endif		422	#endif