Subversion Repositories ssbcc

# Copyright 2014, Sinclair R.F., Inc.

def fetchindexed(ad):

  """

  Built-in macro to the N'th byte from a variable where N is specified by the

  top of the data stack.\n

  Usage:

    <N> .fetchindexed(variable)

  where

    <N>         represents a value of the top of the data stack

    variable    is a variable\n

  The effect is:  T = variable[n]\n

  ( u_offset - u_mem )

  """

  # Add the macro to the list of recognized macros.

  ad.AddMacro('.fetchindexed', 3, [ ['','symbol'] ]);

  # Define the macro functionality.

  def emitFunction(ad,fp,argument):

    variableName = argument[0]['value'];

    (addr,ixBank,bankName) = ad.Emit_GetAddrAndBank(variableName);

    ad.EmitPush(fp,addr,ad.Emit_String(variableName),argument[0]['loc']);

    ad.EmitOpcode(fp,ad.InstructionOpcode('+'),'+');

    ad.EmitOpcode(fp,ad.specialInstructions['fetch'] | ixBank,'fetch '+bankName);

  ad.EmitFunction['.fetchindexed'] = emitFunction;