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20360
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1 /*
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2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "runtime/os.hpp"
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27 #include "utilities/globalDefinitions.hpp"
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28 #include "utilities/nativeCallStack.hpp"
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29
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20364
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30 const NativeCallStack NativeCallStack::EMPTY_STACK(0, false);
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20360
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31
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32 NativeCallStack::NativeCallStack(int toSkip, bool fillStack) :
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33 _hash_value(0) {
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34
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35 #if !PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
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36 fillStack = false;
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37 #endif
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38
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39 if (fillStack) {
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40 os::get_native_stack(_stack, NMT_TrackingStackDepth, toSkip);
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41 } else {
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42 for (int index = 0; index < NMT_TrackingStackDepth; index ++) {
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43 _stack[index] = NULL;
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44 }
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45 }
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46 }
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47
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48 NativeCallStack::NativeCallStack(address* pc, int frameCount) {
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49 int frameToCopy = (frameCount < NMT_TrackingStackDepth) ?
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50 frameCount : NMT_TrackingStackDepth;
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51 int index;
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52 for (index = 0; index < frameToCopy; index ++) {
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53 _stack[index] = pc[index];
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54 }
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55 for (; index < NMT_TrackingStackDepth; index ++) {
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56 _stack[index] = NULL;
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57 }
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58 }
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59
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60 // number of stack frames captured
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61 int NativeCallStack::frames() const {
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62 int index;
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63 for (index = 0; index < NMT_TrackingStackDepth; index ++) {
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64 if (_stack[index] == NULL) {
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65 break;
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66 }
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67 }
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68 return index;
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69 }
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70
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71 // Hash code. Any better algorithm?
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72 int NativeCallStack::hash() const {
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73 long hash_val = _hash_value;
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74 if (hash_val == 0) {
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75 long pc;
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76 int index;
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77 for (index = 0; index < NMT_TrackingStackDepth; index ++) {
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78 pc = (long)_stack[index];
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79 if (pc == 0) break;
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80 hash_val += pc;
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81 }
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82
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83 NativeCallStack* p = const_cast<NativeCallStack*>(this);
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84 p->_hash_value = (int)(hash_val & 0xFFFFFFFF);
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85 }
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86 return _hash_value;
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87 }
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88
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89 void NativeCallStack::print_on(outputStream* out) const {
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90 print_on(out, 0);
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91 }
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92
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93 // Decode and print this call path
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94 void NativeCallStack::print_on(outputStream* out, int indent) const {
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95 address pc;
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96 char buf[1024];
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97 int offset;
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98 if (is_empty()) {
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99 for (int index = 0; index < indent; index ++) out->print(" ");
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100 #if PLATFORM_NATIVE_STACK_WALKING_SUPPORTED
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101 out->print("[BOOTSTRAP]");
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102 #else
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103 out->print("[No stack]");
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104 #endif
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105 } else {
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106 for (int frame = 0; frame < NMT_TrackingStackDepth; frame ++) {
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107 pc = get_frame(frame);
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108 if (pc == NULL) break;
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109 // Print indent
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110 for (int index = 0; index < indent; index ++) out->print(" ");
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111 if (os::dll_address_to_function_name(pc, buf, sizeof(buf), &offset)) {
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112 out->print_cr("[" PTR_FORMAT "] %s+0x%x", p2i(pc), buf, offset);
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113 } else {
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114 out->print_cr("[" PTR_FORMAT "]", p2i(pc));
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115 }
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116 }
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117 }
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118 }
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119
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