1 /*

     2  * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.

     3  * Copyright 2010 Red Hat, Inc.

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

     5  *

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

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

     8  * published by the Free Software Foundation.

     9  *

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

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

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

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

    14  * accompanied this code).

    15  *

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

    17  * 2 along with this work; if not, write to the Free Software Foundation,

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

    19  *

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

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

    22  * have any questions.

    23  *

    24  */

    25 

    26 // This function should match SharkStack::CreateStackOverflowCheck

    27 inline void ZeroStack::overflow_check(int required_words, TRAPS) {

    28   JavaThread *thread = (JavaThread *) THREAD;

    29 

    30   // Check the Zero stack

    31   if (required_words > available_words()) {

    32     handle_overflow(THREAD);

    33     return;

    34   }

    35 

    36   // Check the ABI stack

    37   address stack_top = thread->stack_base() - thread->stack_size();

    38   int free_stack = ((address) &stack_top) - stack_top;

    39   if (free_stack < shadow_pages_size()) {

    40     handle_overflow(THREAD);

    41     return;

    42   }

    43 }