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
overflow_check(int required_words,TRAPS)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.
abi_stack_available(Thread * thread) const50 inline int ZeroStack::abi_stack_available(Thread *thread) const {
51   guarantee(Thread::current() == thread, "should run in the same thread");
52   int stack_used = thread->stack_base() - (address) &stack_used
53     + (StackYellowPages+StackRedPages+StackShadowPages) * os::vm_page_size();
54   int stack_free = thread->stack_size() - stack_used;
55   return stack_free;
56 }
57 
58 #endif // CPU_ZERO_VM_STACK_ZERO_INLINE_HPP
59