1/*
2 * Copyright (c) 2003, 2016, 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 "runtime/thread.hpp"
29#include "stack_zero.hpp"
30#include "stack_zero.inline.hpp"
31
32// Inlined causes circular inclusion with thread.hpp
33ZeroStack::ZeroStack()
34    : _base(NULL), _top(NULL), _sp(NULL) {
35    _shadow_pages_size = JavaThread::stack_shadow_zone_size();
36  }
37
38int ZeroStack::suggest_size(Thread *thread) const {
39  assert(needs_setup(), "already set up");
40  int abi_available = abi_stack_available(thread);
41  assert(abi_available >= 0, "available abi stack must be >= 0");
42  return align_size_down(abi_available / 2, wordSize);
43}
44
45void ZeroStack::handle_overflow(TRAPS) {
46  JavaThread *thread = (JavaThread *) THREAD;
47
48  // Set up the frame anchor if it isn't already
49  bool has_last_Java_frame = thread->has_last_Java_frame();
50  if (!has_last_Java_frame) {
51    intptr_t *sp = thread->zero_stack()->sp();
52    ZeroFrame *frame = thread->top_zero_frame();
53    while (frame) {
54      if (frame->is_shark_frame())
55        break;
56
57      if (frame->is_interpreter_frame()) {
58        interpreterState istate =
59          frame->as_interpreter_frame()->interpreter_state();
60        if (istate->self_link() == istate)
61          break;
62      }
63
64      sp = ((intptr_t *) frame) + 1;
65      frame = frame->next();
66    }
67
68    if (frame == NULL)
69      fatal("unrecoverable stack overflow");
70
71    thread->set_last_Java_frame(frame, sp);
72  }
73
74  // Throw the exception
75  switch (thread->thread_state()) {
76  case _thread_in_Java:
77    InterpreterRuntime::throw_StackOverflowError(thread);
78    break;
79
80  case _thread_in_vm:
81    Exceptions::throw_stack_overflow_exception(thread, __FILE__, __LINE__,
82                                               methodHandle());
83    break;
84
85  default:
86    ShouldNotReachHere();
87  }
88
89  // Reset the frame anchor if necessary
90  if (!has_last_Java_frame)
91    thread->reset_last_Java_frame();
92}
93
94#ifndef PRODUCT
95void ZeroStack::zap(int c) {
96  memset(_base, c, available_words() * wordSize);
97}
98#endif // PRODUCT
99