1/*
2 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#include "precompiled.hpp"
26#include "runtime/os.hpp"
27#include "utilities/decoder.hpp"
28#include "utilities/globalDefinitions.hpp"
29#include "utilities/nativeCallStack.hpp"
30
31NativeCallStack::NativeCallStack(int toSkip, bool fillStack) :
32 _hash_value(0) {
33
34 if (fillStack) {
35 // We need to skip the NativeCallStack::NativeCallStack frame if a tail call is NOT used
36 // to call os::get_native_stack. A tail call is used if _NMT_NOINLINE_ is not defined
37 // (which means this is not a slowdebug build), and we are on 64-bit (except Windows).
38 // This is not necessarily a rule, but what has been obvserved to date.
39#if (defined(_NMT_NOINLINE_) || defined(_WINDOWS) || !defined(_LP64))
40 // Not a tail call.
41 toSkip++;
42#if (defined(_NMT_NOINLINE_) && defined(BSD) && defined(_LP64))
43 // Mac OS X slowdebug builds have this odd behavior where NativeCallStack::NativeCallStack
44 // appears as two frames, so we need to skip an extra frame.
45 toSkip++;
46#endif // Special-case for BSD.
47#endif // Not a tail call.
48 os::get_native_stack(_stack, NMT_TrackingStackDepth, toSkip);
49 } else {
50 for (int index = 0; index < NMT_TrackingStackDepth; index ++) {
51 _stack[index] = NULL;
52 }
53 }
54}
55
56NativeCallStack::NativeCallStack(address* pc, int frameCount) {
57 int frameToCopy = (frameCount < NMT_TrackingStackDepth) ?
58 frameCount : NMT_TrackingStackDepth;
59 int index;
60 for (index = 0; index < frameToCopy; index ++) {
61 _stack[index] = pc[index];
62 }
63 for (; index < NMT_TrackingStackDepth; index ++) {
64 _stack[index] = NULL;
65 }
66 _hash_value = 0;
67}
68
69// number of stack frames captured
70int NativeCallStack::frames() const {
71 int index;
72 for (index = 0; index < NMT_TrackingStackDepth; index ++) {
73 if (_stack[index] == NULL) {
74 break;
75 }
76 }
77 return index;
78}
79
80// Hash code. Any better algorithm?
81unsigned int NativeCallStack::hash() const {
82 uintptr_t hash_val = _hash_value;
83 if (hash_val == 0) {
84 for (int index = 0; index < NMT_TrackingStackDepth; index++) {
85 if (_stack[index] == NULL) break;
86 hash_val += (uintptr_t)_stack[index];
87 }
88
89 NativeCallStack* p = const_cast<NativeCallStack*>(this);
90 p->_hash_value = (unsigned int)(hash_val & 0xFFFFFFFF);
91 }
92 return _hash_value;
93}
94
95void NativeCallStack::print_on(outputStream* out) const {
96 print_on(out, 0);
97}
98
99// Decode and print this call path
100void NativeCallStack::print_on(outputStream* out, int indent) const {
101 address pc;
102 char buf[1024];
103 int offset;
104 int line_no;
105 if (is_empty()) {
106 for (int index = 0; index < indent; index ++) out->print(" ");
107 out->print("[BOOTSTRAP]");
108 } else {
109 for (int frame = 0; frame < NMT_TrackingStackDepth; frame ++) {
110 pc = get_frame(frame);
111 if (pc == NULL) break;
112 // Print indent
113 for (int index = 0; index < indent; index ++) out->print(" ");
114 if (os::dll_address_to_function_name(pc, buf, sizeof(buf), &offset)) {
115 out->print("[" PTR_FORMAT "] %s+0x%x", p2i(pc), buf, offset);
116 } else {
117 out->print("[" PTR_FORMAT "]", p2i(pc));
118 }
119
120 if (Decoder::get_source_info(pc, buf, sizeof(buf), &line_no)) {
121 out->print(" (%s:%d)", buf, line_no);
122 }
123 out->cr();
124 }
125 }
126}
127