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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * 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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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * 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
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 */

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

import java.io.PrintStream;

/**
 * A java VM instruction which takes no immediate operands.
 */

public class InsnSingle extends Insn {

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

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

  /**
   * What are the types of the stack operands ?
   */
  public String argTypes() {
    return VMOp.ops[opcode()].argTypes();
  }

  /**
   * What are the types of the stack results?
   */
  public String resultTypes() {
    return VMOp.ops[opcode()].resultTypes();
  }

  public boolean branches() {
    switch (opcode()) {
    case opc_ireturn:
    case opc_lreturn:
    case opc_freturn:
    case opc_dreturn:
    case opc_areturn:
    case opc_return:
    case opc_athrow:
      return true;
    default:
      return false;
    }
  }


  /* package local methods */

  void print (PrintStream out, int indent) {
    ClassPrint.spaces(out, indent);
    out.println(offset() + "  " + opName(opcode()));//NOI18N
  }

  int store(byte[] buf, int index) {
    buf[index] = (byte) opcode();
    return index+1;
  }

  int size() {
    return 1;
  }

  /* Construct an instruction.  The opcode must be one which requires
     no operands */

  InsnSingle(int theOpcode) {
    this(theOpcode, NO_OFFSET);
  }

  /* The no-check constructor */

  InsnSingle(int theOpcode, int theOffset) {
    super(theOpcode, theOffset);

    switch (theOpcode) {
    case opc_nop:
    case opc_aconst_null:
    case opc_iconst_m1:
    case opc_iconst_0:
    case opc_iconst_1:
    case opc_iconst_2:
    case opc_iconst_3:
    case opc_iconst_4:
    case opc_iconst_5:
    case opc_lconst_0:
    case opc_lconst_1:
    case opc_fconst_0:
    case opc_fconst_1:
    case opc_fconst_2:
    case opc_dconst_0:
    case opc_dconst_1:
    case opc_iload_0:
    case opc_iload_1:
    case opc_iload_2:
    case opc_iload_3:
    case opc_lload_0:
    case opc_lload_1:
    case opc_lload_2:
    case opc_lload_3:
    case opc_fload_0:
    case opc_fload_1:
    case opc_fload_2:
    case opc_fload_3:
    case opc_dload_0:
    case opc_dload_1:
    case opc_dload_2:
    case opc_dload_3:
    case opc_aload_0:
    case opc_aload_1:
    case opc_aload_2:
    case opc_aload_3:
    case opc_iaload:
    case opc_laload:
    case opc_faload:
    case opc_daload:
    case opc_aaload:
    case opc_baload:
    case opc_caload:
    case opc_saload:
    case opc_istore_0:
    case opc_istore_1:
    case opc_istore_2:
    case opc_istore_3:
    case opc_lstore_0:
    case opc_lstore_1:
    case opc_lstore_2:
    case opc_lstore_3:
    case opc_fstore_0:
    case opc_fstore_1:
    case opc_fstore_2:
    case opc_fstore_3:
    case opc_dstore_0:
    case opc_dstore_1:
    case opc_dstore_2:
    case opc_dstore_3:
    case opc_astore_0:
    case opc_astore_1:
    case opc_astore_2:
    case opc_astore_3:
    case opc_iastore:
    case opc_lastore:
    case opc_fastore:
    case opc_dastore:
    case opc_aastore:
    case opc_bastore:
    case opc_castore:
    case opc_sastore:
    case opc_pop:
    case opc_pop2:
    case opc_dup:
    case opc_dup_x1:
    case opc_dup_x2:
    case opc_dup2:
    case opc_dup2_x1:
    case opc_dup2_x2:
    case opc_swap:
    case opc_iadd:
    case opc_ladd:
    case opc_fadd:
    case opc_dadd:
    case opc_isub:
    case opc_lsub:
    case opc_fsub:
    case opc_dsub:
    case opc_imul:
    case opc_lmul:
    case opc_fmul:
    case opc_dmul:
    case opc_idiv:
    case opc_ldiv:
    case opc_fdiv:
    case opc_ddiv:
    case opc_irem:
    case opc_lrem:
    case opc_frem:
    case opc_drem:
    case opc_ineg:
    case opc_lneg:
    case opc_fneg:
    case opc_dneg:
    case opc_ishl:
    case opc_lshl:
    case opc_ishr:
    case opc_lshr:
    case opc_iushr:
    case opc_lushr:
    case opc_iand:
    case opc_land:
    case opc_ior:
    case opc_lor:
    case opc_ixor:
    case opc_lxor:
    case opc_i2l:
    case opc_i2f:
    case opc_i2d:
    case opc_l2i:
    case opc_l2f:
    case opc_l2d:
    case opc_f2i:
    case opc_f2l:
    case opc_f2d:
    case opc_d2i:
    case opc_d2l:
    case opc_d2f:
    case opc_i2b:
    case opc_i2c:
    case opc_i2s:
    case opc_lcmp:
    case opc_fcmpl:
    case opc_fcmpg:
    case opc_dcmpl:
    case opc_dcmpg:
    case opc_ireturn:
    case opc_lreturn:
    case opc_freturn:
    case opc_dreturn:
    case opc_areturn:
    case opc_return:
    case opc_xxxunusedxxx:
    case opc_arraylength:
    case opc_athrow:
    case opc_monitorenter:
    case opc_monitorexit:
      break;

    default:
        throw new InsnError ("attempt to create an " + opName(opcode()) +//NOI18N
                             " without specifying the required operands");//NOI18N
    }
  }
}