stack_zero.inline.hpp revision 9867:3125c4a60cc9 
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.
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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
33inline 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.
50inline int ZeroStack::abi_stack_available(Thread *thread) const {
51  guarantee(Thread::current() == thread, "should run in the same thread");
52  assert(thread->stack_size() -
53         (thread->stack_base() - (address) &stack_used +
54          JavaThread::stack_guard_zone_size() + JavaThread::stack_shadow_zone_size()) ==
55         (address)&stack_used - thread->stack_overflow_limit(), "sanity");
56  return (address)&stack_used - stack_overflow_limit();
57}
58
59#endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
60