/*

 * Copyright (c) 2007, 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.

 *

 * 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.

 */

/**

 * @test

 * @bug 6547378

 * @summary Verify that methods with max_stack==0 don't have exception handlers

 * @author Keith McGuigan

 */

public class VerifyStackForExceptionHandlers extends ClassLoader {

    public static void main(String argv[]) throws Exception {

        VerifyStackForExceptionHandlers t =

            new VerifyStackForExceptionHandlers();

        try {

            t.loadGoodClass();

        } catch(VerifyError e) {

            throw new Exception("FAIL: should be no VerifyError for class A");

        }

        try {

            t.loadBadClass();

            throw new Exception("FAIL: should be a VerifyError for class B");

        } catch(VerifyError e) {

            System.out.println("PASS");

        }

    }

    private void loadGoodClass() {

        /* -- code for class A --

           public class A {

               public static void f() {}

           }

        */

        long[] cls_data = {

            0xcafebabe00000031L, 0x000e0a0003000b07L,

            0x000c07000d010006L, 0x3c696e69743e0100L,

            0x0328295601000443L, 0x6f646501000f4c69L,

            0x6e654e756d626572L, 0x5461626c65010001L,

            0x6601000a536f7572L, 0x636546696c650100L,

            0x06412e6a6176610cL, 0x0004000501000141L,

            0x0100106a6176612fL, 0x6c616e672f4f626aL,

            0x6563740021000200L, 0x0300000000000200L,

            0x0100040005000100L, 0x060000001d000100L,

            0x01000000052ab700L, 0x01b1000000010007L,

            0x0000000600010000L, 0x0001000900080005L,

            0x0001000600000019L, 0x0000000000000001L,

            0xb100000001000700L, 0x0000060001000000L,

            0x0200010009000000L, 0x02000a0000000000L

        };

        final int EXTRA = 5;

        byte cf_bytes[] = toByteArray(cls_data);

        Class c = defineClass("A", cf_bytes, 0, cf_bytes.length - EXTRA);

        try { c.newInstance(); } // to force linking, thus verification

        catch(InstantiationException e) {}

        catch(IllegalAccessException e) {}

    }

    private void loadBadClass() throws VerifyError {

        /* -- code for class B --

           public class B {

               public static void g() {}

               public static void f() {

                  // bytecode modified to have a max_stack value of 0

                  try { g(); }

                  catch (NullPointerException e) {}

               }

        }

        */

        long[] cls_data = {

            0xcafebabe00000031L, 0x00120a000400060aL,

            0x000d00030c000f00L, 0x0a0700050100106aL,

            0x6176612f6c616e67L, 0x2f4f626a6563740cL,

            0x0011000a01000a53L, 0x6f7572636546696cL,

            0x6507000901001e6aL, 0x6176612f6c616e67L,

            0x2f4e756c6c506f69L, 0x6e74657245786365L,

            0x7074696f6e010003L, 0x282956010006422eL,

            0x6a61736d01000443L, 0x6f646507000e0100L,

            0x0142010001670100L, 0x01660100063c696eL,

            0x69743e0021000d00L, 0x0400000000000300L,

            0x010011000a000100L, 0x0c00000011000100L,

            0x01000000052ab700L, 0x01b1000000000009L,

            0x000f000a0001000cL, 0x0000000d00000000L,

            0x00000001b1000000L, 0x0000090010000a00L,

            0x01000c0000001c00L, 0x00000100000008b8L,

            0x0002a700044bb100L, 0x0100000003000600L,

            0x0800000001000700L, 0x000002000b000000L // 3 bytes extra

        };

        final int EXTRA = 3;

        byte cf_bytes[] = toByteArray(cls_data);

        Class c = defineClass("B", cf_bytes, 0, cf_bytes.length - EXTRA);

        try { c.newInstance(); } // to force linking, thus verification

        catch(InstantiationException e) {}

        catch(IllegalAccessException e) {}

    }

    static private byte[] toByteArray(long arr[]) {

        // convert long array to byte array

        java.nio.ByteBuffer bbuf = java.nio.ByteBuffer.allocate(arr.length * 8);

        bbuf.asLongBuffer().put(java.nio.LongBuffer.wrap(arr));

        return bbuf.array();

    }

    }