/*

 * Copyright (c) 1995, 2003, 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 sun.tools.java;

import java.io.*;

/**

 * WARNING: The contents of this source file are not part of any

 * supported API.  Code that depends on them does so at its own risk:

 * they are subject to change or removal without notice.

 */

public class BinaryCode implements Constants {

    int maxStack;               // maximum stack used by code

    int maxLocals;              // maximum locals used by code

    BinaryExceptionHandler exceptionHandlers[];

    BinaryAttribute atts;       // code attributes

    BinaryConstantPool cpool;   // constant pool of the class

    byte code[];                // the byte code

    /**

     * Construct the binary code from the code attribute

     */

    public

    BinaryCode(byte data[], BinaryConstantPool cpool, Environment env) {

        DataInputStream in = new DataInputStream(new ByteArrayInputStream(data));

        try {

            this.cpool = cpool;

            // JVM 4.7.4 CodeAttribute.max_stack

            this.maxStack = in.readUnsignedShort();

            // JVM 4.7.4 CodeAttribute.max_locals

            this.maxLocals = in.readUnsignedShort();

            // JVM 4.7.4 CodeAttribute.code_length

            int code_length = in.readInt();

            this.code = new byte[code_length];

            // JVM 4.7.4 CodeAttribute.code[]

            in.read(this.code);

            // JVM 4.7.4 CodeAttribute.exception_table_length

            int exception_count = in.readUnsignedShort();

            this.exceptionHandlers = new BinaryExceptionHandler[exception_count];

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

                // JVM 4.7.4 CodeAttribute.exception_table.start_pc

                int start = in.readUnsignedShort();

                // JVM 4.7.4 CodeAttribute.exception_table.end_pc

                int end = in.readUnsignedShort();

                // JVM 4.7.4 CodeAttribute.exception_table.handler_pc

                int handler = in.readUnsignedShort();

                // JVM 4.7.4 CodeAttribute.exception_table.catch_type

                ClassDeclaration xclass = cpool.getDeclaration(env, in.readUnsignedShort());

                this.exceptionHandlers[i]  =

                    new BinaryExceptionHandler(start, end, handler, xclass);

            }

            this.atts = BinaryAttribute.load(in, cpool, ~0);

            if (in.available() != 0) {

                System.err.println("Should have exhausted input stream!");

            }

        } catch (IOException e) {

            throw new CompilerError(e);

        }

    }

    /**

     * Accessors

     */

    public BinaryExceptionHandler getExceptionHandlers()[] {

        return exceptionHandlers;

    }

    public byte getCode()[] { return code; }

    public int getMaxStack() { return maxStack; }

    public int getMaxLocals() { return maxLocals; }

    public BinaryAttribute getAttributes() { return atts; }

    /**

     * Load a binary class

     */

    public static

    BinaryCode load(BinaryMember bf, BinaryConstantPool cpool, Environment env) {

        byte code[] = bf.getAttribute(idCode);

        return (code != null) ? new BinaryCode(code, cpool, env) : null;

    }

}