def trace_code(pc, data, marks, points, labels):
"""Follows a line of code until an unconditional branch or invalid opcode"""
while not marks[pc]:
op = data[pc]
opinfo = nestech.cpu_opcodes[op]
length = 1 + nestech.cpu_addr_modes[opinfo[1]].get_length()
mneumonic = opinfo[0]
if op in branches:
marks[pc] = True
if not marks[nestech.rel_addr(pc, data)]:
points.insert(0,nestech.rel_addr(pc, data))
if not nestech.rel_addr(pc, data) in labels:
labels.insert(0,nestech.rel_addr(pc, data))
pc += length
elif op in jsr:
marks[pc] = True
if not marks[nestech.abs_addr(pc, data)]:
points.insert(0,nestech.abs_addr(pc, data))
if not nestech.abs_addr(pc, data) in labels:
labels.insert(0,nestech.abs_addr(pc, data))
pc += length
elif op in jump_absolute:
marks[pc] = True
if not marks[nestech.abs_addr(pc, data)]:
points.insert(0,nestech.abs_addr(pc, data))
if not nestech.abs_addr(pc, data) in labels:
labels.insert(0,nestech.abs_addr(pc, data))
return
elif op in jump_indirect:
marks[pc] = True
return
elif op in return_ops:
marks[pc] = True
return
elif not mneumonic == 'und':
addr_mode = nestech.cpu_addr_modes[opinfo[1]].get_name()
# may change to 'absolute ' if want to just do indexed
if 'absolute' in addr_mode:
addr = nestech.abs_addr(pc, data)
if 0x8000 <= addr and addr <= 0xffff:
labels.insert(0,addr)
marks[pc] = True
pc += length
else:
return
if op in redir_ops:
if named_labels.has_key(int(arg[1:], 16)):
arg = named_label[int(arg[1:], 16)]
code_string = 4*' ' + mneumonic + ' ' + arg
code_string += (16-len(arg))*' ' + '; $%04x' % (pc)
else:
arg = arg[1:].upper()
code_string = 4*' ' + mneumonic + ' ' + 'L' + arg
code_string += 11*' ' + '; $%04x' % (pc)
elif 'absolute' in addr_mode:
if named_labels.has_key(int(arg[1:5], 16)):
arg = named_label[int(arg[1:], 16)]
code_string = 4*' ' + mneumonic + ' ' + arg
code_string += (16-len(arg))*' ' + '; $%04x' % (pc)
elif nestech.abs_addr(pc, prg_data) in labels:
arg = arg[1:5].upper() + arg[5:]
code_string = 4*' ' + mneumonic + ' ' + 'L' + arg
code_string += (16 - len(arg) - 1)*' ' + '; $%04x' % (pc)
else:
code_string = 4*' ' + mneumonic + ' ' + arg
code_string += (16 - len(arg))*' ' + '; $%04x' % (pc)
else:
code_string = 4*' ' + mneumonic + ' ' + arg
code_string += (16 - len(arg))*' ' + '; $%04x' % (pc)
output_file.write(code_string + '\n')
pc += length
output_file.write('\n\n')