def __pass_2(self):
self.__logger.info("Pass 2 started")
output_data_list = []
with open(self.__input_file) as f_input:
while True:
current_line = Util.clean(f_input.readline())
label, opcode, operand = self.parse_line(current_line)
if label == OpCode.START or opcode == OpCode.START:
output_header_template = "H {program_name} {start_address} {program_length}".format(
program_name=self.__program_name.rjust(6, " "),
start_address=self.__start_address[2:].rjust(6, "0"),
program_length=hex(self.__program_length)[2:].rjust(
6, "0"))
start_address_line = "\nT {start_address}".format(
start_address=self.__start_address[2:].rjust(6, "0"))
self.__logger.info(output_header_template)
self.__logger.info(start_address_line)
if not self.__dry_run:
output_data_list.append(output_header_template)
output_data_list.append(start_address_line)
continue
if label == OpCode.END or opcode == OpCode.END:
end_line = "\nE {start_address}".format(
start_address=self.__start_address[2:].rjust(6, "0"))
self.__logger.info(end_line)
if not self.__dry_run:
output_data_list.append(end_line)
with open(self.__output_file, "w") as f_output:
f_output.write(" ".join(output_data_list))
break
optab_dict = Optab.as_dict()
mnemonics_list = list(optab_dict.keys())
instruction = None
if opcode in mnemonics_list:
if operand:
if operand in self.__sym_tab.keys():
address = self.__sym_tab[operand]
else:
raise Exception(
"Error. Undefined symbol: {operand}.".format(
operand=operand))
else:
address = "0"
instruction = optab_dict[opcode]
# address field is 16 bit(4 nibbles)
# So if the address is not 4 nibble long we pad it with extra 0's.
address = address.rjust(4, "0")
# in the next line we calculate the 3rd nibble(i.e the first nibble after opcode).
nibble = int(
str(int(Util.is_index_mode(current_line))) +
"0" * 3) + int(address[0])
nibble = hex(nibble) # convert it back to hex.
nibble = nibble[2:] # remove the 0x in the beginning.
instruction = instruction + nibble + address[1:]
elif opcode == OpCode.WORD or opcode == OpCode.BYTE:
instruction = operand.rjust(6, "0")
if instruction:
self.__logger.info(instruction)
if not self.__dry_run and instruction:
output_data_list.append(instruction)
def __pass_1(self):
self.__logger.info("Pass 1 started")
mnemonics_list = list(Optab.as_dict().keys())
output_data_list = []
with open(self.__input_file) as f_input:
first_line = f_input.readline()
first_line = Util.clean(first_line)
label, opcode, operand = self.parse_line(first_line)
if opcode == OpCode.START:
self.__locctr = hex(int(operand, 16))
self.__program_name = label
else:
self.__locctr = 0
self.__start_address = self.__locctr
write_content = self.__file_data_template.format(
locctr=self.__locctr,
label=label,
opcode=opcode,
operand=operand,
)
self.__logger.info(write_content)
if not self.__dry_run:
output_data_list.append(write_content)
while True:
current_line = Util.clean(f_input.readline())
# If the current line is empty or is a comment, skip
if current_line and current_line[0] == ".":
continue
label, opcode, operand = self.parse_line(current_line)
if opcode == OpCode.END or label == OpCode.END:
self.__locctr = hex(int(self.__locctr, 16) + value)
write_content = self.__file_data_template.format(
locctr=self.__locctr,
label=label,
opcode=opcode,
operand=operand,
)
self.__logger.info(write_content)
if not self.__dry_run:
with open(self.__intermediate_file, "w") as f_output:
for line in output_data_list:
f_output.write(Util.clean(line))
f_output.write(NEW_LINE)
self.__program_length = int(self.__locctr, 16) - int(
self.__start_address, 16)
self.__logger.info("Program length: {length}".format(
length=self.__program_length))
break
if label in self.__sym_tab.keys():
raise Exception("Error. Duplicate symbol")
if label:
# hex values contain 0x in the beginning, remove it.
self.__sym_tab[label] = self.__locctr[2:]
value = self.__get_memory_space(opcode, operand, current_line,
mnemonics_list)
if value == ERROR_INVALID_OPCODE:
raise Exception("Error. Opcode {opcode} is invalid".format(
opcode=opcode))
self.__locctr = hex(int(self.__locctr, 16) + value)
write_content = self.__file_data_template.format(
locctr=self.__locctr,
label=label,
opcode=opcode,
operand=operand,
)
self.__logger.info(write_content)
if not self.__dry_run:
output_data_list.append(write_content)