1 /*
   2  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #ifndef CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
  27 #define CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
  28 
  29 #include "runtime/thread.hpp"
  30 #include "stack_zero.hpp"
  31 
  32 // This function should match SharkStack::CreateStackOverflowCheck
  33 inline void ZeroStack::overflow_check(int required_words, TRAPS) {
  34   // Check the Zero stack
  35   if (available_words() < required_words) {
  36     handle_overflow(THREAD);
  37     return;
  38   }
  39 
  40   // Check the ABI stack
  41   if (abi_stack_available(THREAD) < 0) {
  42     handle_overflow(THREAD);
  43     return;
  44   }
  45 }
  46 
  47 // This method returns the amount of ABI stack available for us
  48 // to use under normal circumstances.  Note that the returned
  49 // value can be negative.
  50 inline ssize_t ZeroStack::abi_stack_available(Thread *thread) const {
  51   ssize_t stack_used = thread->stack_base() - (address) &stack_used
  52     + (StackYellowPages+StackRedPages+StackShadowPages) * os::vm_page_size();
  53   ssize_t stack_free = thread->stack_size() - stack_used;
  54   return stack_free;
  55 }
  56 
  57 #endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP