kopia lustrzana https://github.com/maccasoft/z80-tools
43 wiersze
1.0 KiB
Java
43 wiersze
1.0 KiB
Java
package nl.grauw.glass.instructions;
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import nl.grauw.glass.Scope;
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import nl.grauw.glass.expressions.Expression;
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import nl.grauw.glass.expressions.Schema;
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public class Djnz extends InstructionFactory {
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@Override
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public InstructionObject createObject(Scope context, Expression arguments) {
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if (Djnz_N.ARGUMENTS.check(arguments))
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return new Djnz_N(context, arguments);
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throw new ArgumentException();
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}
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public static class Djnz_N extends InstructionObject {
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public static Schema ARGUMENTS = new Schema(Schema.DIRECT_N);
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private Expression argument;
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public Djnz_N(Scope context, Expression arguments) {
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super(context);
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this.argument = arguments;
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}
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@Override
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public int getSize() {
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return 2;
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}
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@Override
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public byte[] getBytes() {
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int offset = argument.getAddress() - (context.getAddress() + 2);
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if (offset < -128 || offset > 127)
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throw new ArgumentException("Jump offset out of range: " + offset);
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return new byte[] { (byte)0x10, (byte)offset };
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}
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}
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}
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