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[/] [ssbcc/] [trunk/] [macros/] [9x8/] [push16.py] - Rev 3
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# 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 u 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]; if argument['type'] == 'value': v = argument['value']; elif argument['type'] == 'symbol': name = argument['value']; if not ad.IsSymbol(name): raise asmDef.AsmException('Symbol "%s" not recognized at %s' % (argument['value'],argument['loc'],)); ix = ad.symbols['list'].index(name); v = ad.symbols['body'][ix]; if len(v) != 1: raise asmDef.AsmException('Argument can only be one value at %s' % argument['loc']); v = v[0]; else: raise asmDef.AsmException('Argument "%s" of type "%s" not recognized at %s' % (argument['value'],argument['type'],argument['loc'],)); if type(v) != int: raise Exception('Program Bug -- value should be an "int"'); ad.EmitPush(fp,v%0x100,''); v >>= 8; printValue = argument['value'] if type(argument['value']) == str else '0x%08X' % argument['value']; ad.EmitPush(fp,v%0x100,'.push16(%s)' % printValue); ad.EmitFunction['.push16'] = emitFunction;
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