ConstPoolDirective.java

/*
  ConstPoolDirective.java

  (c) 2008-2013 Edward Swartz

  All rights reserved. This program and the accompanying materials
  are made available under the terms of the Eclipse Public License v1.0
  which accompanies this distribution, and is available at
  http://www.eclipse.org/legal/epl-v10.html
 */
package v9t9.tools.asm.directive;

import java.util.List;

import v9t9.common.asm.IInstruction;
import v9t9.common.asm.ResolveException;
import v9t9.tools.asm.IAsmInstructionFactory;
import v9t9.tools.asm.IAssembler;
import v9t9.tools.asm.Symbol;
import v9t9.tools.asm.operand.hl.AssemblerOperand;
import v9t9.tools.asm.transform.ConstPool;

/**
 * Indicate where the const table should live (automatically added)
 * @author Ed
 *
 */
public class ConstPoolDirective extends Directive {

	private ConstPool constPool;

	/**
	 * @param ops  
	 */
	public ConstPoolDirective(List<AssemblerOperand> ops) {
		
	}
	@Override
	public String toString() {
		return ("$CONSTTABLE");
	}
	
	/* (non-Javadoc)
	 * @see v9t9.tools.asm.BaseAssemblerInstruction#resolve(v9t9.tools.asm.Assembler, v9t9.engine.cpu.IInstruction, boolean)
	 */
	@Override
	public IInstruction[] resolve(IAssembler assembler, IInstruction previous,
			boolean finalPass) throws ResolveException {
		
		this.constPool = assembler.getConstPool();
		Symbol symbol = constPool.getTableAddr();
		if (symbol == null) {
			return NO_INSTRUCTIONS;
		}
		
		// go even
		assembler.setPc((assembler.getPc() + 1) & 0xfffe);
		setPc(assembler.getPc());

		symbol.setAddr(assembler.getPc());

		// skip table
		assembler.setPc((assembler.getPc() + constPool.getSize() + 1) & 0xfffe);

		return new IInstruction[] { this };
	}
	
	public byte[] getBytes(IAsmInstructionFactory factory) {
		return constPool.getBytes();
	}
	
}