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1 /*
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2 * Copyright 2000-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.utilities;
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26
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27 import sun.jvm.hotspot.code.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.gc_interface.*;
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30 import sun.jvm.hotspot.interpreter.*;
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31 import sun.jvm.hotspot.runtime.*;
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32 import sun.jvm.hotspot.memory.*;
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33
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34 /** This class, only intended for use in the debugging system,
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35 provides the functionality of find() in the VM. */
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36
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37 public class PointerFinder {
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38 public static PointerLocation find(Address a) {
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39 PointerLocation loc = new PointerLocation(a);
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40
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41 CollectedHeap heap = VM.getVM().getUniverse().heap();
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42 if (heap instanceof GenCollectedHeap) {
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43 GenCollectedHeap genheap = (GenCollectedHeap) heap;
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44 if (genheap.isIn(a)) {
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45 for (int i = 0; i < genheap.nGens(); i++) {
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46 Generation g = genheap.getGen(i);
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47 if (g.isIn(a)) {
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48 loc.gen = g;
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49 break;
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50 }
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51 }
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52
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53 if (loc.gen == null) {
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54 // Should be in perm gen
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55 Generation permGen = genheap.permGen();
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56 if (Assert.ASSERTS_ENABLED) {
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57 Assert.that(permGen.isIn(a), "should have been in ordinary or perm gens if it's in the heap");
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58 }
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59 loc.permGen = permGen;
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60 }
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61
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62 if (VM.getVM().getUseTLAB()) {
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63 // Try to find thread containing it
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64 for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) {
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65 ThreadLocalAllocBuffer tlab = t.tlab();
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66 if (tlab.contains(a)) {
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67 loc.inTLAB = true;
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68 loc.tlabThread = t;
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69 loc.tlab = tlab;
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70 break;
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71 }
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72 }
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73 }
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74
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75 return loc;
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76 }
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77 } else {
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78 if (heap.isIn(a)) {
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79 loc.heap = heap;
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80 return loc;
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81 }
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82 }
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83
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84 Interpreter interp = VM.getVM().getInterpreter();
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85 if (interp.contains(a)) {
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86 loc.inInterpreter = true;
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87 loc.interpreterCodelet = interp.getCodeletContaining(a);
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88 return loc;
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89 }
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90
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91 if (!VM.getVM().isCore()) {
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92 CodeCache c = VM.getVM().getCodeCache();
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93 if (c.contains(a)) {
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94 loc.inCodeCache = true;
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95 loc.blob = c.findBlobUnsafe(a);
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96 if (Assert.ASSERTS_ENABLED) {
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97 Assert.that(loc.blob != null, "Should have found CodeBlob");
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98 }
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99 loc.inBlobInstructions = loc.blob.instructionsContains(a);
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100 loc.inBlobData = loc.blob.dataContains(a);
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101 loc.inBlobOops = loc.blob.oopsContains(a);
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102 loc.inBlobUnknownLocation = (!(loc.inBlobInstructions ||
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103 loc.inBlobData ||
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104 loc.inBlobOops));
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105 return loc;
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106 }
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107 }
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108
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109 // Check JNIHandles; both local and global
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110 JNIHandles handles = VM.getVM().getJNIHandles();
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111 JNIHandleBlock handleBlock = handles.globalHandles();
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112 if (handleBlock != null) {
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113 handleBlock = handleBlock.blockContainingHandle(a);
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114 }
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115 if (handleBlock != null) {
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116 loc.inStrongGlobalJNIHandleBlock = true;
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117 loc.handleBlock = handleBlock;
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118 return loc;
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119 } else {
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120 handleBlock = handles.weakGlobalHandles();
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121 if (handleBlock != null) {
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122 handleBlock = handleBlock.blockContainingHandle(a);
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123 if (handleBlock != null) {
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124 loc.inWeakGlobalJNIHandleBlock = true;
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125 loc.handleBlock = handleBlock;
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126 return loc;
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127 } else {
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128 // Look in thread-local handles
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129 for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) {
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130 handleBlock = t.activeHandles();
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131 if (handleBlock != null) {
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132 handleBlock = handleBlock.blockContainingHandle(a);
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133 if (handleBlock != null) {
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134 loc.inLocalJNIHandleBlock = true;
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135 loc.handleBlock = handleBlock;
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136 loc.handleThread = t;
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137 return loc;
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138 }
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139 }
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140 }
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141 }
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142 }
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143 }
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144
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145
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146 // Fall through; have to return it anyway.
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147 return loc;
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148 }
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149 }
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