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 }
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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 // Check the Zero stack
29 if (available_words() < required_words) {
30 handle_overflow(THREAD);
31 return;
32 }
33
34 // Check the ABI stack
35 if (abi_stack_available(THREAD) < 0) {
36 handle_overflow(THREAD);
37 return;
38 }
39 }
40
41 // This method returns the amount of ABI stack available for us
42 // to use under normal circumstances. Note that the returned
43 // value can be negative.
44 inline int ZeroStack::abi_stack_available(Thread *thread) const {
45 int stack_used = thread->stack_base() - (address) &stack_used;
46 int stack_free = thread->stack_size() - stack_used;
47 return stack_free - shadow_pages_size();
48 }
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