nativeCallStack.cpp revision 6853:91eeb8807a03 
1/*
2 * Copyright (c) 2014, 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/globalDefinitions.hpp"
28#include "utilities/nativeCallStack.hpp"
29
30
31NativeCallStack::NativeCallStack(int toSkip, bool fillStack) :
32  _hash_value(0) {
33
34#if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
35  fillStack = false;
36#endif
37
38  if (fillStack) {
39    os::get_native_stack(_stack, NMT_TrackingStackDepth, toSkip);
40  } else {
41    for (int index = 0; index < NMT_TrackingStackDepth; index ++) {
42      _stack[index] = NULL;
43    }
44  }
45}
46
47NativeCallStack::NativeCallStack(address* pc, int frameCount) {
48  int frameToCopy = (frameCount < NMT_TrackingStackDepth) ?
49    frameCount : NMT_TrackingStackDepth;
50  int index;
51  for (index = 0; index < frameToCopy; index ++) {
52    _stack[index] = pc[index];
53  }
54  for (; index < NMT_TrackingStackDepth; index ++) {
55    _stack[index] = NULL;
56  }
57}
58
59// number of stack frames captured
60int NativeCallStack::frames() const {
61  int index;
62  for (index = 0; index < NMT_TrackingStackDepth; index ++) {
63    if (_stack[index] == NULL) {
64      break;
65    }
66  }
67  return index;
68}
69
70// Hash code. Any better algorithm?
71int NativeCallStack::hash() const {
72  long hash_val = _hash_value;
73  if (hash_val == 0) {
74    long pc;
75    int  index;
76    for (index = 0; index < NMT_TrackingStackDepth; index ++) {
77      pc = (long)_stack[index];
78      if (pc == 0) break;
79      hash_val += pc;
80    }
81
82    NativeCallStack* p = const_cast<NativeCallStack*>(this);
83    p->_hash_value = (int)(hash_val & 0xFFFFFFFF);
84  }
85  return _hash_value;
86}
87
88void NativeCallStack::print_on(outputStream* out) const {
89  print_on(out, 0);
90}
91
92// Decode and print this call path
93void NativeCallStack::print_on(outputStream* out, int indent) const {
94  address pc;
95  char    buf[1024];
96  int     offset;
97  if (is_empty()) {
98    for (int index = 0; index < indent; index ++) out->print(" ");
99#if PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
100    out->print("[BOOTSTRAP]");
101#else
102    out->print("[No stack]");
103#endif
104  } else {
105    for (int frame = 0; frame < NMT_TrackingStackDepth; frame ++) {
106      pc = get_frame(frame);
107      if (pc == NULL) break;
108      // Print indent
109      for (int index = 0; index < indent; index ++) out->print(" ");
110      if (os::dll_address_to_function_name(pc, buf, sizeof(buf), &offset)) {
111        out->print_cr("[" PTR_FORMAT "] %s+0x%x", p2i(pc), buf, offset);
112      } else {
113        out->print_cr("[" PTR_FORMAT "]", p2i(pc));
114      }
115    }
116  }
117}
118
119