Thu, 06 May 2010 02:09:18 -0700
6950178: Zero stack improvements
Summary: Moves the logic for determining the size of the Zero stack into the ZeroStack class.
Reviewed-by: twisti
Contributed-by: Gary Benson <gbenson@redhat.com>
1 /*
2 * Copyright 2003-2007 Sun Microsystems, Inc. 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 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 */
26 #include "incls/_precompiled.incl"
27 #include "incls/_stack_zero.cpp.incl"
29 int ZeroStack::suggest_size(Thread *thread) const {
30 assert(needs_setup(), "already set up");
31 return align_size_down(abi_stack_available(thread) / 2, wordSize);
32 }
34 void ZeroStack::handle_overflow(TRAPS) {
35 JavaThread *thread = (JavaThread *) THREAD;
37 // Set up the frame anchor if it isn't already
38 bool has_last_Java_frame = thread->has_last_Java_frame();
39 if (!has_last_Java_frame) {
40 intptr_t *sp = thread->zero_stack()->sp();
41 ZeroFrame *frame = thread->top_zero_frame();
42 while (frame) {
43 if (frame->is_shark_frame())
44 break;
46 if (frame->is_interpreter_frame()) {
47 interpreterState istate =
48 frame->as_interpreter_frame()->interpreter_state();
49 if (istate->self_link() == istate)
50 break;
51 }
53 sp = ((intptr_t *) frame) + 1;
54 frame = frame->next();
55 }
57 if (frame == NULL)
58 fatal("unrecoverable stack overflow");
60 thread->set_last_Java_frame(frame, sp);
61 }
63 // Throw the exception
64 switch (thread->thread_state()) {
65 case _thread_in_Java:
66 InterpreterRuntime::throw_StackOverflowError(thread);
67 break;
69 case _thread_in_vm:
70 Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__);
71 break;
73 default:
74 ShouldNotReachHere();
75 }
77 // Reset the frame anchor if necessary
78 if (!has_last_Java_frame)
79 thread->reset_last_Java_frame();
80 }
82 #ifndef PRODUCT
83 void ZeroStack::zap(int c) {
84 memset(_base, c, available_words() * wordSize);
85 }
86 #endif // PRODUCT