def p_instruction_r_imm(p):
"""instruction : OPERATOR REGISTER COMMA IMMEDIATE NEWLINE"""
logging.debug('r_imm OPRT %s REG %s IMM %s, size=%s',
p[1], p[2], p[4], 4)
inc(4)
p[0] = InstRImm(p[1],
p[2],
sgn(p[4], 0xffff))
def p_instruction_imm(p):
"""instruction : OPERATOR IMMEDIATE NEWLINE"""
size, operand = 2, p[2]
if 'jr' in p[1]:
operand = sgn(p[2], 0xff)
elif 'jmp' in p[1]:
size = 4
logging.debug('imm OPRT %s IMM %s, size=%s',
p[1], operand, size)
inc(size)
p[0] = InstImm(p[1],
operand)
def p_instruction_label(p):
"""instruction : OPERATOR LABEL NEWLINE"""
logging.debug('label OPRT %s LABEL %s, size=%s',
p[1], p[2], 2)
inc()
if 'jr' not in p[1]:
operand = PendingLabel(p[2], sgn, [0xff])
else:
# this is a relative jump instruction
current_byte = get() # immediately get the current position
operand = PendingLabel(p[2],
lambda l_imm: sgn(l_imm - current_byte,
0xff))
p[0] = InstImm(p[1],
operand)
