VM_AssemblerShortBranch.java

/*
 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
 *
 *  This file is licensed to You under the Common Public License (CPL);
 *  You may not use this file except in compliance with the License. You
 *  may obtain a copy of the License at
 *
 *      http://www.opensource.org/licenses/cpl1.0.php
 *
 *  See the COPYRIGHT.txt file distributed with this work for information
 *  regarding copyright ownership.
 */
package org.jikesrvm.compilers.common.assembler.ppc;

import org.jikesrvm.compilers.common.assembler.VM_AbstractAssembler;
import org.jikesrvm.compilers.common.assembler.VM_ForwardReference;

/**
 * This class was formerly a private static inner class of VM_Assembler, but has
 * been pulled out to work around a bug whereby the system seems to have gotten
 * confused by the relationship between:
 *
 * VM_ForwardReference -> VM_ForwardReference.ShortBranch -> VM_Assembler.ShortBranch, and VM_Assembler
 *
 * This problem does not exist under IA32 since there is no need for VM_Assembler.ShortBranch
 */
class VM_AssemblerShortBranch extends VM_ForwardReference.ShortBranch {
  final int spTopOffset;

  VM_AssemblerShortBranch(int source, int sp) {
    super(source);
    spTopOffset = sp;
  }

  public void resolve(VM_AbstractAssembler asm) {
    super.resolve(asm);
    if (((VM_Assembler) asm).compiler != null) {
      ((VM_Assembler) asm).compiler.spTopOffset = spTopOffset;
    }
  }
}