thread_linux_zero.hpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2007, 2008, 2009, 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#ifndef OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
27#define OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
28
29 private:
30  ZeroStack  _zero_stack;
31  ZeroFrame* _top_zero_frame;
32
33  void pd_initialize() {
34    _top_zero_frame = NULL;
35  }
36
37 public:
38  ZeroStack *zero_stack() {
39    return &_zero_stack;
40  }
41
42 public:
43  ZeroFrame *top_zero_frame() {
44    return _top_zero_frame;
45  }
46  void push_zero_frame(ZeroFrame *frame) {
47    *(ZeroFrame **) frame = _top_zero_frame;
48    _top_zero_frame = frame;
49  }
50  void pop_zero_frame() {
51    zero_stack()->set_sp((intptr_t *) _top_zero_frame + 1);
52    _top_zero_frame = *(ZeroFrame **) _top_zero_frame;
53  }
54
55 public:
56  static ByteSize zero_stack_offset() {
57    return byte_offset_of(JavaThread, _zero_stack);
58  }
59  static ByteSize top_zero_frame_offset() {
60    return byte_offset_of(JavaThread, _top_zero_frame);
61  }
62
63 public:
64  void record_base_of_stack_pointer() {
65    assert(top_zero_frame() == NULL, "junk on stack prior to Java call");
66  }
67  void set_base_of_stack_pointer(intptr_t* base_sp) {
68    assert(base_sp == NULL, "should be");
69    assert(top_zero_frame() == NULL, "junk on stack after Java call");
70  }
71
72 public:
73  void set_last_Java_frame() {
74    set_last_Java_frame(top_zero_frame(), zero_stack()->sp());
75  }
76  void reset_last_Java_frame() {
77    frame_anchor()->zap();
78  }
79  void set_last_Java_frame(ZeroFrame* fp, intptr_t* sp) {
80    frame_anchor()->set(sp, NULL, fp);
81  }
82
83 public:
84  ZeroFrame* last_Java_fp() {
85    return frame_anchor()->last_Java_fp();
86  }
87
88 private:
89  frame pd_last_frame() {
90    assert(has_last_Java_frame(), "must have last_Java_sp() when suspended");
91    return frame(last_Java_fp(), last_Java_sp());
92  }
93
94 public:
95  static ByteSize last_Java_fp_offset() {
96    return byte_offset_of(JavaThread, _anchor) +
97      JavaFrameAnchor::last_Java_fp_offset();
98  }
99
100 public:
101  // Check for pending suspend requests and pending asynchronous
102  // exceptions.  There are separate accessors for these, but
103  // _suspend_flags is volatile so using them would be unsafe.
104  bool has_special_condition_for_native_trans() {
105    return _suspend_flags != 0;
106  }
107
108 public:
109  bool pd_get_top_frame_for_signal_handler(frame* fr_addr,
110                                           void* ucontext,
111                                           bool isInJava) {
112    ShouldNotCallThis();
113  }
114
115  // These routines are only used on cpu architectures that
116  // have separate register stacks (Itanium).
117  static bool register_stack_overflow() { return false; }
118  static void enable_register_stack_guard() {}
119  static void disable_register_stack_guard() {}
120
121#endif // OS_CPU_LINUX_ZERO_VM_THREAD_LINUX_ZERO_HPP
122