/*

 * Copyright (c) 2001, 2004, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

package sun.jvm.hotspot.interpreter;

import sun.jvm.hotspot.oops.*;

import sun.jvm.hotspot.utilities.*;

public class Bytecode {

  Method method;

  int bci;

  static final int jintSize = 4;

  static final String spaces = " ";

  static final String comma  = ", ";

  Bytecode(Method method, int bci) {

    this.method = method;

    this.bci    = bci;

  }

  // Address computation

  // NOTE: assumes that the start of the method's bytecodes is 4-byte aligned

  int alignedOffset(int offset) {

    return Bits.roundTo(bci + offset, jintSize) - bci;

  }

  int javaSignedWordAt(int offset) {

    return method.getBytecodeIntArg(bci + offset);

  }

  short javaShortAt(int offset) {

    return method.getBytecodeShortArg(bci + offset);

  }

  byte javaByteAt(int offset) {

    return method.getBytecodeByteArg(bci + offset);

  }

  public Method method() { return method; }

  public int    bci()    { return bci;    }

  // hotspot byte code

  public int code() {

    return Bytecodes.codeAt(method(), bci());

  }

  // jvm byte code

  public int javaCode() {

    return Bytecodes.javaCode(code());

  }

  public String getBytecodeName() {

    return Bytecodes.name(code());

  }

  public String getJavaBytecodeName() {

    return Bytecodes.name(javaCode());

  }

  public int getLength() {

    return Bytecodes.lengthAt(method(), bci());

  }

  public int getJavaLength() {

    return Bytecodes.javaLengthAt(method(), bci());

  }

  public String toString() {

    StringBuffer buf = new StringBuffer(getJavaBytecodeName());

    if (code() != javaCode()) {

       buf.append(spaces);

       buf.append('[');

       buf.append(getBytecodeName());

       buf.append(']');

    }

    return buf.toString();

  }

}