Glassfish example source code file (InsnIntOp.java)

This example Glassfish source code file (InsnIntOp.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

insnerror, insnerror, insnintop, insnintop, invalid, io, no_offset, noi18n, noi18n, string, string, t_boolean, t_char, t_double, t_float

The Glassfish InsnIntOp.java source code

/*
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 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * 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
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package com.sun.jdo.api.persistence.enhancer.classfile;

import java.io.PrintStream;

/**
 * An instruction which requires a integral constant as an immediate operand 
 */

public class InsnIntOp extends Insn {
  /* The operand */
  private int operandValue;

  /* 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 opcode() == opc_ret;
  }

  public int value() {
    return operandValue;
  }

  /* package local methods */

  static String primType(int primIndex) {
    switch (primIndex) {
    case T_BOOLEAN:
        return "boolean";//NOI18N
    case T_CHAR:
        return "char";//NOI18N
    case T_FLOAT:
        return "float";//NOI18N
    case T_DOUBLE:
        return "double";//NOI18N
    case T_BYTE:
        return "byte";//NOI18N
    case T_SHORT:
        return "short";//NOI18N
    case T_INT:
        return "int";//NOI18N
    case T_LONG:
        return "long";//NOI18N
    default:
        throw new InsnError ("Invalid primitive type(" + primIndex + ")");//NOI18N
    }
  }

  void print (PrintStream out, int indent) {
    ClassPrint.spaces(out, indent);
    if (opcode() == opc_newarray) 
        out.println(offset() + "  opc_newarray  " + primType(operandValue));//NOI18N
    else
        out.println(offset() + "  " + opName(opcode()) + "  " + operandValue);//NOI18N
  }

  int store(byte[] buf, int index) {
    if (size() == 4) {
      /* prefix with an opc_wide */
      buf[index++] = (byte) opc_wide;
    }

    buf[index++] = (byte) opcode();
    if (size() > 2)
      buf[index++] = (byte)(operandValue >> 8);
    buf[index++] = (byte)(operandValue & 0xff);
    return index;
  }


  /* return the size of the instruction in bytes */

  int size() {
    switch(opcode()) {
    case opc_bipush:
    case opc_newarray:
      /* These are always 1 byte constants */
      return 2;

    case opc_sipush: /* a short constant */
      /* This is always a 2 byte constant */
      return 3;

    case opc_iload:
    case opc_lload:
    case opc_fload:
    case opc_dload:
    case opc_aload:
    case opc_istore:
    case opc_lstore:
    case opc_fstore:
    case opc_dstore:
    case opc_astore:
    case opc_ret:
      /* These can be one or two byte constants specifying a local var.
       * If a two byte constant, the constant is prefixed by a wide
       * instruction */
      if (operandValue < 256)
	return 2;
      else
	return 4;

    default:
        throw new InsnError ("invalid instruction " + opName(opcode()) +//NOI18N
                             " with an integer operand");//NOI18N
    }
  }


  InsnIntOp (int theOpcode, int theOperand, int pc) {
    super(theOpcode, pc);

    operandValue = theOperand;
  }


  InsnIntOp (int theOpcode, int theOperand) {
    super(theOpcode, NO_OFFSET);

    operandValue = theOperand;
    switch(theOpcode) {
    case opc_bipush:
    case opc_newarray:
      /* These are always 1 byte constants */

    case opc_sipush: /* a short constant */
      /* This is always a 2 byte constant */

    case opc_dload:
    case opc_lload:
    case opc_iload:
    case opc_fload:
    case opc_aload:
    case opc_istore:
    case opc_lstore:
    case opc_fstore:
    case opc_dstore:
    case opc_astore:
    case opc_ret:
      /* These can be one or two byte constants specifying a local var */
      break;

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