jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/classfile/Code

     1 /*

     2  * Copyright 2007-2008 Sun Microsystems, Inc.  All Rights Reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Sun designates this

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

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    26 package com.sun.tools.classfile;

    28 import java.io.IOException;

    30 /**

    31  * See JVMS3, section 4.8.3.

    32  *

    33  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If

    34  *  you write code that depends on this, you do so at your own risk.

    35  *  This code and its internal interfaces are subject to change or

    36  *  deletion without notice.</b>

    37  */

    38 public class Code_attribute extends Attribute {

    39     public class InvalidIndex extends AttributeException {

    40         private static final long serialVersionUID = -8904527774589382802L;

    41         InvalidIndex(int index) {

    42             this.index = index;

    43         }

    45         @Override

    46         public String getMessage() {

    47             // i18n

    48             return "invalid index " + index + " in Code attribute";

    49         }

    51         public final int index;

    52     }

    54     Code_attribute(ClassReader cr, int name_index, int length)

    55             throws IOException, ConstantPoolException {

    56         super(name_index, length);

    57         max_stack = cr.readUnsignedShort();

    58         max_locals = cr.readUnsignedShort();

    59         code_length = cr.readInt();

    60         code = new byte[code_length];

    61         cr.readFully(code);

    62         exception_table_langth = cr.readUnsignedShort();

    63         exception_table = new Exception_data[exception_table_langth];

    64         for (int i = 0; i < exception_table_langth; i++)

    65             exception_table[i] = new Exception_data(cr);

    66         attributes = new Attributes(cr);

    67     }

    69     public int getByte(int offset) throws InvalidIndex {

    70         if (offset < 0 || offset >= code.length)

    71             throw new InvalidIndex(offset);

    72         return code[offset];

    73     }

    75     public int getUnsignedByte(int offset) throws InvalidIndex {

    76         if (offset < 0 || offset >= code.length)

    77             throw new InvalidIndex(offset);

    78         return code[offset] & 0xff;

    79     }

    81     public int getShort(int offset) throws InvalidIndex {

    82         if (offset < 0 || offset + 1 >= code.length)

    83             throw new InvalidIndex(offset);

    84         return (code[offset] << 8) | (code[offset + 1] & 0xFF);

    85     }

    87     public int getUnsignedShort(int offset) throws InvalidIndex {

    88         if (offset < 0 || offset + 1 >= code.length)

    89             throw new InvalidIndex(offset);

    90         return ((code[offset] << 8) | (code[offset + 1] & 0xFF)) & 0xFFFF;

    91     }

    93     public int getInt(int offset) throws InvalidIndex {

    94         if (offset < 0 || offset + 3 >= code.length)

    95             throw new InvalidIndex(offset);

    96         return (getShort(offset) << 16) | (getShort(offset + 2) & 0xFFFF);

    97     }

    99     public <R, D> R accept(Visitor<R, D> visitor, D data) {

   100         return visitor.visitCode(this, data);

   101     }

   103     public final int max_stack;

   104     public final int max_locals;

   105     public final int code_length;

   106     public final byte[] code;

   107     public final int exception_table_langth;

   108     public final Exception_data[] exception_table;

   109     public final Attributes attributes;

   111     public class Exception_data {

   112         Exception_data(ClassReader cr) throws IOException {

   113             start_pc = cr.readUnsignedShort();

   114             end_pc = cr.readUnsignedShort();

   115             handler_pc = cr.readUnsignedShort();

   116             catch_type = cr.readUnsignedShort();

   117         }

   119         public final int start_pc;

   120         public final int end_pc;

   121         public final int handler_pc;

   122         public final int catch_type;

   123     }

   124 }

src/share/classes/com/sun/tools/classfile/Code_attribute.java@b4b1f7732289