def p_logical_expression_not(self, p):
'''logical_expression : BOOL_NOT logical_expression'''
t = Token('NOT', '!')
p[0] = UnaryOp(p[2], t)
if p[2].dtype != ('bool', 0):
print('invalid usage of operator logical NOT.')
sys.exit(0)
p[0].dtype = ('bool', 0)
def p_exression_deref(self, p):
'''expression : STAR expression'''
t = Token('DEREF', p[1])
p[0] = UnaryOp(p[2], t)
dtype = p[2].dtype
if dtype[1] <= 0:
print('invalid usage of pointer.')
sys.exit(0)
p[0].dtype = (dtype[0], dtype[1] - 1)
def p_lhs(self, p):
'''lhs : STAR lhs'''
t = Token('DEREF', p[1])
p[0] = UnaryOp(p[2], t)
dtype = p[2].dtype
if dtype[1] <= 0:
print('invalid usage of pointer.')
sys.exit(0)
p[0].dtype = (dtype[0], dtype[1] - 1)
def p_addr(self, p):
'''addr : AND id'''
if p[2].entry['type'] == 'function':
print('invalid usage of function %s.' % (p[2].value))
sys.exit(0)
t = Token('ADDR', p[1])
p[0] = UnaryOp(p[2], t)
dtype = p[2].entry['type']
p[0].dtype = (dtype[0], dtype[1] + 1)
def p_expression_uminus(self, p):
'''expression : MINUS expression %prec UMINUS'''
t = Token('UMINUS', '-')
p[0] = UnaryOp(p[2], t)
check_direct_access(p[2])
dtype = p[2].dtype
if dtype[0] == 'void' or dtype[1] != 0:
print(
'invalid use of operator unary minus on expression of type: ',
dtype)
sys.exit(0)
p[0].dtype = dtype
