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TBEL is a powerful expression language for ThingsBoard platform user-defined functions. Original implementation is based on MVEL.

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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holders nor the names of its
//    contributors may be used to endorse or promote products derived from
//    this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// THE POSSIBILITY OF SUCH DAMAGE.

package org.mvel2.asm;

/**
 * Information about the input stack map frame at the "current" instruction of a method. This is
 * implemented as a Frame subclass for a "basic block" containing only one instruction.
 *
 * @author Eric Bruneton
 */
final class CurrentFrame extends Frame {

  CurrentFrame(final Label owner) {
    super(owner);
  }

  /**
   * Sets this CurrentFrame to the input stack map frame of the next "current" instruction, i.e. the
   * instruction just after the given one. It is assumed that the value of this object when this
   * method is called is the stack map frame status just before the given instruction is executed.
   */
  @Override
  void execute(
      final int opcode, final int arg, final Symbol symbolArg, final SymbolTable symbolTable) {
    super.execute(opcode, arg, symbolArg, symbolTable);
    Frame successor = new Frame(null);
    merge(symbolTable, successor, 0);
    copyFrom(successor);
  }
}