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let_output_word.js
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/*****************************************************************************
LET WORD
*****************************************************************************/
//============================================================================
// Simple word math expressions
//============================================================================
// TODO: ROL, ROR ... and don't forget to implement "and" "or" ... also in "byte"!!!!
// TODO: ROL, ROR ... and don't forget to implement "and" "or" ... also in "byte"!!!!
// TODO: ROL, ROR ... and don't forget to implement "and" "or" ... also in "byte"!!!!
// TODO: ROL, ROR ... and don't forget to implement "and" "or" ... also in "byte"!!!!
// TODO: ROL, ROR ... and don't forget to implement "and" "or" ... also in "byte"!!!!
function _wordAddition( tac ) {
// swap left and right if: word b = byte a + x
if ( tac.left_data_type == "byte" && tac.right_data_type != "byte" ) {
let tmp_left = [ "value", "data_type", "addressing_mode" ];
tmp_left.data_type = tac.left_data_type;
tmp_left.value = tac.left_value;
tmp_left.addressing_mode = tac.left_addressing_mode;
tac.left_data_type = tac.right_data_type;
tac.left_value = tac.right_value;
tac.left_addressing_mode = tac.right_addressing_mode;
tac.right_data_type = tmp_left.data_type;
tac.right_value = tmp_left.value;
tac.right_addressing_mode = tmp_left.addressing_mode;
}
// LO Bytes
emitLDA( getLoOperand( tac.left_value, tac.left_addressing_mode ) );
emitCLC();
emitADC( getLoOperand( tac.right_value, tac.right_addressing_mode ) );
emitSTA( getLoOperand( tac.dest_value, tac.dest_addressing_mode ) );
if ( tac.dest_addressing_mode != "xind"
&& tac.dest_addressing_mode != "indy"
&& tac.right_data_type == "byte"
&& tac.dest_value == tac.left_value ) {
let label = getNextLabel();
emitBCC( label );
emitINC( getHiOperand( tac.dest_value, tac.dest_addressing_mode ) );
emitLABEL( label );
return;
}
// HI Bytes
if ( tac.left_addressing_mode == "indy" ) {
emitINY();
}
if ( tac.left_data_type == "byte" ) {
emitLDA( "#0" ) ;
} else {
emitLDA( getHiOperand( tac.left_value, tac.left_addressing_mode ) );
}
if ( tac.right_data_type == "byte" ) {
emitADC( "#0" );
} else {
if ( tac.right_addressing_mode == "indy" && tac.left_addressing_mode != "indy" ) {
emitINY();
}
emitADC( getHiOperand( tac.right_value, tac.right_addressing_mode ) );
}
emitSTA( getHiOperand( tac.dest_value, tac.dest_addressing_mode ) );
}
function _wordSubtruction( tac ) {
emitLDA( getLoOperand( tac.left_value, tac.left_addressing_mode ) );
emitSEC();
emitSBC( getLoOperand( tac.right_value, tac.right_addressing_mode ) );
emitSTA( getLoOperand( tac.dest_value, tac.dest_addressing_mode ) );
if ( tac.left_addressing_mode == "indy" ) {
emitINY();
}
if ( tac.left_data_type == "byte" ) {
emitLDA( "#0" ) ;
} else {
emitLDA( getHiOperand( tac.left_value, tac.left_addressing_mode ) );
}
if ( tac.right_data_type == "byte" ) {
emitSBC( "#0" ) ;
} else {
if ( tac.right_addressing_mode == "indy" && tac.left_addressing_mode != "indy" ) {
emitINY();
}
emitSBC( getHiOperand( tac.right_value, tac.right_addressing_mode ) );
}
emitSTA( getHiOperand( tac.dest_value, tac.dest_addressing_mode ) );
}
function _wordMultiplication( tac ) {
}
function _wordDivision( tac ) {
}
function _wordAnd( tac ) {
}
function _wordOr( tac ) {
}
function _wordXor( tac ) {
}
function _wordShiftLeft( tac ) {
}
function _wordShiftRight( tac ) {
}
function _wordAssignment( tac ) {
// LO Bytes
emitLDA( getLoOperand( tac.left_value, tac.left_addressing_mode ) );
emitSTA( getLoOperand( tac.dest_value, tac.dest_addressing_mode ) );
// HI Bytes
if ( tac.left_addressing_mode == "indy" )
emitINY();
if ( tac.left_data_type == "byte" )
emitLDA( "#0" );
else
emitLDA( getHiOperand( tac.left_value, tac.left_addressing_mode ) );
if ( tac.dest_addressing_mode == "indy" && tac.left_addressing_mode != "indy" )
emitINY();
emitSTA( getHiOperand( tac.dest_value, tac.dest_addressing_mode ) );
}
//============================================================================
// Output code for word expression
//============================================================================
function output6502CodeForWordExpression() {
let opcode_nr = 0;
for (var i = 0; i < tac.length; i++) {
switch ( tac[i].operator ) {
case "+":
_wordAddition( tac[i] );
break;
case "-":
_wordSubtruction( tac[i] );
break;
case "*":
if (tac[i].right_addressing_mode == "imm") {
emitCodeLine("+_IMUL888I_ " + tac[i].right_value.substring(1));
} else {
emitCodeLine("+_CALL_PROC_IMUL888_ " + tac[i].right_value);
}
break;
case "/":
if (tac[i].right_addressing_mode == "imm") {
emitCodeLine("+_IDIV888I_ " + tac[i].right_value.substring(1));
} else {
emitCodeLine("+_CALL_PROC_IDIV888_ " + tac[i].right_value);
}
break;
case "<<":
ThrowSyntaxErrorIfOperandIsNotImmediate(tac[i].right_addressing_mode, tac[i].right_value);
emitCodeLine("+_SHL_ " + tac[i].right_value.substring(1));
break;
case ">>":
ThrowSyntaxErrorIfOperandIsNotImmediate(tac[i].right_addressing_mode, tac[i].right_value);
emitCodeLine("+_SHR_ " + tac[i].right_value.substring(1));
break;
case "=":
_wordAssignment( tac[i] );
}
opcode_nr++;
}
}