Glassfish example source code file (InsnTargetOp.java)

This example Glassfish source code file (InsnTargetOp.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

insn, insnerror, insnerror, insntarget, insntarget, insntargetop, insntargetop, io, no_offset, noi18n, noi18n, printstream, string, target

The Glassfish InsnTargetOp.java source code

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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
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 * file and include the License file at packager/legal/LICENSE.txt.
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 *
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package com.sun.jdo.api.persistence.enhancer.classfile;


import java.io.PrintStream;

/**
 * An instruction which requires a single branch offset
 * as an immediate operand .
 */

public class InsnTargetOp extends Insn {
  /* The branch target */
  InsnTarget targetOp;

  /* public accessors */

  public int nStackArgs() {
    return VMOp.ops[opcode()].nStackArgs();
  }

  public int nStackResults() {
    return VMOp.ops[opcode()].nStackResults();
  }

  public String argTypes() {
    return VMOp.ops[opcode()].argTypes();
  }

  public String resultTypes() {
    return VMOp.ops[opcode()].resultTypes();
  }

  public boolean branches() {
    return true;
  }

  /**
   * Mark possible branch targets
   */
  public void markTargets() {
    targetOp.setBranchTarget();
  }

  /**
   * Return the branch target which is the immediate operand
   */
  public InsnTarget target() {
    return targetOp;
  }
    
  /* package local methods */

  void print (PrintStream out, int indent) {
    ClassPrint.spaces(out, indent);
    /* print offset in non-relative form for readability */
    out.println(offset() + "  " + opName(opcode()) + "  " + //NOI18N
		targetOp.offset());
  }

  int store(byte[] buf, int index) {
    buf[index++] = (byte) opcode();
    int off = targetOp.offset() - offset();
    if (opcode() == opc_goto_w || opcode() == opc_jsr_w)
      return storeInt(buf, index, off);
    else
      return storeShort(buf, index, (short)off);
  }

  int size() {
    if (opcode() == opc_goto_w || opcode() == opc_jsr_w)
      return 5;
    return 3;
  }

  InsnTargetOp (int theOpcode, InsnTarget theOperand, int pc) {
    super(theOpcode, pc);
    targetOp = theOperand;
  }

  InsnTargetOp (int theOpcode, InsnTarget theOperand) {
    super(theOpcode, NO_OFFSET);

    targetOp = theOperand;

    switch(theOpcode) {
    case opc_ifeq:
    case opc_ifne:
    case opc_iflt:
    case opc_ifge:
    case opc_ifgt:
    case opc_ifle:
    case opc_if_icmpeq:
    case opc_if_icmpne:
    case opc_if_icmplt:
    case opc_if_icmpge:
    case opc_if_icmpgt:
    case opc_if_icmple:
    case opc_if_acmpeq:
    case opc_if_acmpne:
    case opc_goto:
    case opc_jsr:
    case opc_ifnull:
    case opc_ifnonnull:
    case opc_goto_w:
    case opc_jsr_w:
      /* Target */
      if (theOperand == null)
          throw new InsnError ("attempt to create an " + opName(theOpcode) +//NOI18N
                               " with a null Target operand");//NOI18N
      break;

    default:
        throw new InsnError ("attempt to create an " + opName(theOpcode) +//NOI18N
                             " with an InsnTarget operand");//NOI18N
    }
  }
}