stack_zero.cpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2003, 2007, 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#include "incls/_precompiled.incl"
27#include "incls/_stack_zero.cpp.incl"
28
29int 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}
33
34void ZeroStack::handle_overflow(TRAPS) {
35  JavaThread *thread = (JavaThread *) THREAD;
36
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;
45
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      }
52
53      sp = ((intptr_t *) frame) + 1;
54      frame = frame->next();
55    }
56
57    if (frame == NULL)
58      fatal("unrecoverable stack overflow");
59
60    thread->set_last_Java_frame(frame, sp);
61  }
62
63  // Throw the exception
64  switch (thread->thread_state()) {
65  case _thread_in_Java:
66    InterpreterRuntime::throw_StackOverflowError(thread);
67    break;
68
69  case _thread_in_vm:
70    Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__);
71    break;
72
73  default:
74    ShouldNotReachHere();
75  }
76
77  // Reset the frame anchor if necessary
78  if (!has_last_Java_frame)
79    thread->reset_last_Java_frame();
80}
81
82#ifndef PRODUCT
83void ZeroStack::zap(int c) {
84  memset(_base, c, available_words() * wordSize);
85}
86#endif // PRODUCT
87