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package org.algorithmx.rules.asm;

// 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
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.

/**
 * 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);
    }
}