Subversion Repositories ssbcc

# Copyright 2014, Sinclair R.F., Inc.
 
def push16(ad):
  """
  User-defined macro to push a 16 bit value onto the data stack so that the LSB
  is deepest in the data stack and the MSB is at the top of the data stack.\n
  Usage:
    .push16(v)
  where
    v           is a 16-bit value, a constant, or an evaluated expression\n
  The effect is to push v%0x100 and int(v/2**8)%0x100 onto the data stack.\n
  ( - u_LSB u_MSB )
  """
 
  # Add the macro to the list of recognized macros.
  ad.AddMacro('.push16', 2, [ ['','singlevalue','symbol'] ]);
 
  # Define the macro functionality.
  def emitFunction(ad,fp,argument):
    argument = argument[0];
    v = ad.Emit_IntegerValue(argument);
    if not (-2**15 <= v < 2**16):
      raise asmDef.AsmException('Argument "%s" should be a 16-bit integer at %s' % (argument['value'],argument['loc'],));
    printString = argument['value'] if type(argument['value']) == str else '0x%04X' % (v % 2**16);
    ad.EmitPush(fp,v%0x100,'');
    v >>= 8;
    ad.EmitPush(fp,v%0x100,'.push16(%s)' % printString);
 
  ad.EmitFunction['.push16'] = emitFunction;