001    /*
002     * Copyright 2005 Sun Microsystems, Inc.  All Rights Reserved.
003     * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004     *
005     * This code is free software; you can redistribute it and/or modify it
006     * under the terms of the GNU General Public License version 2 only, as
007     * published by the Free Software Foundation.  Sun designates this
008     * particular file as subject to the "Classpath" exception as provided
009     * by Sun in the LICENSE file that accompanied this code.
010     *
011     * This code is distributed in the hope that it will be useful, but WITHOUT
012     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013     * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014     * version 2 for more details (a copy is included in the LICENSE file that
015     * accompanied this code).
016     *
017     * You should have received a copy of the GNU General Public License version
018     * 2 along with this work; if not, write to the Free Software Foundation,
019     * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020     *
021     * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022     * CA 95054 USA or visit www.sun.com if you need additional information or
023     * have any questions.
024     */
025    
026    
027    package sun.tools.javap;
028    
029    import java.util.*;
030    import java.io.*;
031    
032    import static sun.tools.javap.RuntimeConstants.*;
033    
034    /* represents one entry of StackMap attribute
035     */
036    class StackMapData {
037        final int offset;
038        final int[] locals;
039        final int[] stack;
040    
041        StackMapData(int offset, int[] locals, int[] stack) {
042            this.offset = offset;
043            this.locals = locals;
044            this.stack = stack;
045        }
046    
047        StackMapData(DataInputStream in, MethodData method) throws IOException {
048            offset = in.readUnsignedShort();
049            int local_size = in.readUnsignedShort();
050            locals = readTypeArray(in, local_size, method);
051            int stack_size = in.readUnsignedShort();
052            stack = readTypeArray(in, stack_size, method);
053        }
054    
055        static final int[] readTypeArray(DataInputStream in, int length, MethodData method) throws IOException {
056            int[] types = new int[length];
057            for (int i=0; i<length; i++) {
058                types[i] = readType(in, method);
059            }
060            return types;
061        }
062    
063        static final int readType(DataInputStream in, MethodData method) throws IOException {
064            int type = in.readUnsignedByte();
065            if (type == ITEM_Object || type == ITEM_NewObject) {
066                type = type | (in.readUnsignedShort()<<8);
067            }
068            return type;
069        }
070    
071        void print(JavapPrinter p) {
072            p.out.println("   " + offset + ":");
073            p.printMap("    locals = [", locals);
074            p.printMap("    stack = [", stack);
075        }
076    }