stack_zero.cpp revision 1879:f95d63e2154a 
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#include "precompiled.hpp"
27#include "interpreter/interpreterRuntime.hpp"
28#include "stack_zero.hpp"
29#include "stack_zero.inline.hpp"
30
31int ZeroStack::suggest_size(Thread *thread) const {
32  assert(needs_setup(), "already set up");
33  return align_size_down(abi_stack_available(thread) / 2, wordSize);
34}
35
36void ZeroStack::handle_overflow(TRAPS) {
37  JavaThread *thread = (JavaThread *) THREAD;
38
39  // Set up the frame anchor if it isn't already
40  bool has_last_Java_frame = thread->has_last_Java_frame();
41  if (!has_last_Java_frame) {
42    intptr_t *sp = thread->zero_stack()->sp();
43    ZeroFrame *frame = thread->top_zero_frame();
44    while (frame) {
45      if (frame->is_shark_frame())
46        break;
47
48      if (frame->is_interpreter_frame()) {
49        interpreterState istate =
50          frame->as_interpreter_frame()->interpreter_state();
51        if (istate->self_link() == istate)
52          break;
53      }
54
55      sp = ((intptr_t *) frame) + 1;
56      frame = frame->next();
57    }
58
59    if (frame == NULL)
60      fatal("unrecoverable stack overflow");
61
62    thread->set_last_Java_frame(frame, sp);
63  }
64
65  // Throw the exception
66  switch (thread->thread_state()) {
67  case _thread_in_Java:
68    InterpreterRuntime::throw_StackOverflowError(thread);
69    break;
70
71  case _thread_in_vm:
72    Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__);
73    break;
74
75  default:
76    ShouldNotReachHere();
77  }
78
79  // Reset the frame anchor if necessary
80  if (!has_last_Java_frame)
81    thread->reset_last_Java_frame();
82}
83
84#ifndef PRODUCT
85void ZeroStack::zap(int c) {
86  memset(_base, c, available_words() * wordSize);
87}
88#endif // PRODUCT
89