1/* 2 * Copyright (c) 2000, 2015, 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 25package sun.jvm.hotspot.utilities; 26 27import sun.jvm.hotspot.code.*; 28import sun.jvm.hotspot.debugger.*; 29import sun.jvm.hotspot.gc.shared.*; 30import sun.jvm.hotspot.interpreter.*; 31import sun.jvm.hotspot.runtime.*; 32import sun.jvm.hotspot.memory.*; 33 34/** This class, only intended for use in the debugging system, 35 provides the functionality of find() in the VM. */ 36 37public class PointerFinder { 38 public static PointerLocation find(Address a) { 39 PointerLocation loc = new PointerLocation(a); 40 41 CollectedHeap heap = VM.getVM().getUniverse().heap(); 42 if (heap instanceof GenCollectedHeap) { 43 GenCollectedHeap genheap = (GenCollectedHeap) heap; 44 if (genheap.isIn(a)) { 45 for (int i = 0; i < genheap.nGens(); i++) { 46 Generation g = genheap.getGen(i); 47 if (g.isIn(a)) { 48 loc.gen = g; 49 break; 50 } 51 } 52 53 if (Assert.ASSERTS_ENABLED) { 54 Assert.that(loc.gen != null, "Should have found this in a generation"); 55 } 56 57 if (VM.getVM().getUseTLAB()) { 58 // Try to find thread containing it 59 for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) { 60 ThreadLocalAllocBuffer tlab = t.tlab(); 61 if (tlab.contains(a)) { 62 loc.inTLAB = true; 63 loc.tlabThread = t; 64 loc.tlab = tlab; 65 break; 66 } 67 } 68 } 69 70 return loc; 71 } 72 } else { 73 if (heap.isIn(a)) { 74 loc.heap = heap; 75 return loc; 76 } 77 } 78 79 Interpreter interp = VM.getVM().getInterpreter(); 80 if (interp.contains(a)) { 81 loc.inInterpreter = true; 82 loc.interpreterCodelet = interp.getCodeletContaining(a); 83 return loc; 84 } 85 86 if (!VM.getVM().isCore()) { 87 CodeCache c = VM.getVM().getCodeCache(); 88 if (c.contains(a)) { 89 loc.inCodeCache = true; 90 loc.blob = c.findBlobUnsafe(a); 91 if (Assert.ASSERTS_ENABLED) { 92 Assert.that(loc.blob != null, "Should have found CodeBlob"); 93 } 94 loc.inBlobCode = loc.blob.codeContains(a); 95 loc.inBlobData = loc.blob.dataContains(a); 96 97 if (loc.blob.isNMethod()) { 98 NMethod nm = (NMethod) loc.blob; 99 loc.inBlobOops = nm.oopsContains(a); 100 } 101 102 loc.inBlobUnknownLocation = (!(loc.inBlobCode || 103 loc.inBlobData || 104 loc.inBlobOops)); 105 return loc; 106 } 107 } 108 109 // Check JNIHandles; both local and global 110 JNIHandles handles = VM.getVM().getJNIHandles(); 111 JNIHandleBlock handleBlock = handles.globalHandles(); 112 if (handleBlock != null) { 113 handleBlock = handleBlock.blockContainingHandle(a); 114 } 115 if (handleBlock != null) { 116 loc.inStrongGlobalJNIHandleBlock = true; 117 loc.handleBlock = handleBlock; 118 return loc; 119 } else { 120 handleBlock = handles.weakGlobalHandles(); 121 if (handleBlock != null) { 122 handleBlock = handleBlock.blockContainingHandle(a); 123 if (handleBlock != null) { 124 loc.inWeakGlobalJNIHandleBlock = true; 125 loc.handleBlock = handleBlock; 126 return loc; 127 } else { 128 // Look in thread-local handles 129 for (JavaThread t = VM.getVM().getThreads().first(); t != null; t = t.next()) { 130 handleBlock = t.activeHandles(); 131 if (handleBlock != null) { 132 handleBlock = handleBlock.blockContainingHandle(a); 133 if (handleBlock != null) { 134 loc.inLocalJNIHandleBlock = true; 135 loc.handleBlock = handleBlock; 136 loc.handleThread = t; 137 return loc; 138 } 139 } 140 } 141 } 142 } 143 } 144 145 146 // Fall through; have to return it anyway. 147 return loc; 148 } 149} 150