1 /*
2 * Copyright (c) 2003, 2016, 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
overflow_check(int required_words,TRAPS)32 inline void ZeroStack::overflow_check(int required_words, TRAPS) {
33 // Check the Zero stack
34 if (available_words() < required_words) {
35 handle_overflow(THREAD);
36 return;
37 }
38
39 // Check the ABI stack
40 if (abi_stack_available(THREAD) < 0) {
41 handle_overflow(THREAD);
42 return;
43 }
44 }
45
46 // This method returns the amount of ABI stack available for us
47 // to use under normal circumstances. Note that the returned
48 // value can be negative.
abi_stack_available(Thread * thread) const49 inline int ZeroStack::abi_stack_available(Thread *thread) const {
50 guarantee(Thread::current() == thread, "should run in the same thread");
51 int stack_used = thread->stack_base() - (address) &stack_used
52 + (JavaThread::stack_guard_zone_size() + JavaThread::stack_shadow_zone_size());
53 int stack_free = thread->stack_size() - stack_used;
54 return stack_free;
55 }
56
57 #endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
58