1 /* 2 * Copyright (c) 2001, 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, 20 * CA 94065 USA or visit www.oracle.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 package sun.jvm.hotspot.bugspot; 26 27 import sun.jvm.hotspot.debugger.*; 28 import sun.jvm.hotspot.debugger.cdbg.*; 29 30 /** Helper class for locating a program counter. Indicates the 31 confidence of the find. */ 32 33 public class PCFinder { 34 public static final int LOW_CONFIDENCE = 1; 35 public static final int HIGH_CONFIDENCE = 2; 36 37 public static class Info { 38 private String name; 39 private long offset; 40 private int confidence; 41 42 public Info(String name, long offset, int confidence) { 43 this.name = name; 44 this.offset = offset; 45 this.confidence = confidence; 46 } 47 48 /** May be null */ 49 public String getName() { return name; } 50 51 /** If this is -1, a symbol could not be found, and the offset 52 should not be shown */ 53 public long getOffset() { return offset; } 54 55 /** PCFinder.LOW_CONFIDENCE or PCFinder.HIGH_CONFIDENCE */ 56 public int getConfidence() { return confidence; } 57 } 58 59 /** Passed loadobject may be null in which case the returned Info 60 object has low confidence */ 61 public static Info findPC(Address pc, LoadObject lo, CDebugger dbg) { 62 if (lo == null) { 63 return new Info(null, -1, LOW_CONFIDENCE); 64 } 65 66 // First try debug info 67 BlockSym sym = lo.debugInfoForPC(pc); 68 while (sym != null) { 69 if (sym.isFunction()) { 70 // Highest confidence 71 return new Info(sym.toString(), pc.minus(sym.getAddress()), HIGH_CONFIDENCE); 72 } 73 } 74 75 // Now try looking up symbol in loadobject 76 77 // FIXME: must add support for mapfiles on Win32 and try looking 78 // up there first if possible. Should we hide that behind 79 // LoadObject.closestSymbolToPC and have the ClosestSymbol return 80 // confidence? I think so. On Solaris there is no notion of a 81 // mapfile, and the confidence for closestSymbolToPC will be high 82 // instead of low. 83 84 int confidence = HIGH_CONFIDENCE; 85 86 ClosestSymbol cs = lo.closestSymbolToPC(pc); 87 if (cs != null) { 88 // FIXME: currently low confidence (only on Win32) 89 return new Info(cs.getName() + "()", cs.getOffset(), LOW_CONFIDENCE); 90 } 91 92 // Unknown location 93 return new Info(dbg.getNameOfFile(lo.getName()).toUpperCase() + 94 "! " + pc + "()", -1, HIGH_CONFIDENCE); 95 } 96 }