/*

 * Copyright (c) 2005, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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 org.apidesign.javap;

import java.util.*;

import java.io.*;

import static org.apidesign.javap.RuntimeConstants.*;

/* represents one entry of StackMap attribute

 */

class StackMapData {

    final int offset;

    final int[] locals;

    final int[] stack;

    StackMapData(int offset, int[] locals, int[] stack) {

        this.offset = offset;

        this.locals = locals;

        this.stack = stack;

    }

    StackMapData(DataInputStream in, MethodData method) throws IOException {

        offset = in.readUnsignedShort();

        int local_size = in.readUnsignedShort();

        locals = readTypeArray(in, local_size, method);

        int stack_size = in.readUnsignedShort();

        stack = readTypeArray(in, stack_size, method);

    }

    static final int[] readTypeArray(DataInputStream in, int length, MethodData method) throws IOException {

        int[] types = new int[length];

        for (int i=0; i<length; i++) {

            types[i] = readType(in, method);

        }

        return types;

    }

    static final int readType(DataInputStream in, MethodData method) throws IOException {

        int type = in.readUnsignedByte();

        if (type == ITEM_Object || type == ITEM_NewObject) {

            type = type | (in.readUnsignedShort()<<8);

        }

        return type;

    }

}