Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/bugspot/PCFinder.java @ 554:78144dc3db03
Merge
author | never |
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date | Tue, 13 Jan 2009 14:02:19 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.bugspot; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.debugger.cdbg.*; /** Helper class for locating a program counter. Indicates the confidence of the find. */ public class PCFinder { public static final int LOW_CONFIDENCE = 1; public static final int HIGH_CONFIDENCE = 2; public static class Info { private String name; private long offset; private int confidence; public Info(String name, long offset, int confidence) { this.name = name; this.offset = offset; this.confidence = confidence; } /** May be null */ public String getName() { return name; } /** If this is -1, a symbol could not be found, and the offset should not be shown */ public long getOffset() { return offset; } /** PCFinder.LOW_CONFIDENCE or PCFinder.HIGH_CONFIDENCE */ public int getConfidence() { return confidence; } } /** Passed loadobject may be null in which case the returned Info object has low confidence */ public static Info findPC(Address pc, LoadObject lo, CDebugger dbg) { if (lo == null) { return new Info(null, -1, LOW_CONFIDENCE); } // First try debug info BlockSym sym = lo.debugInfoForPC(pc); while (sym != null) { if (sym.isFunction()) { // Highest confidence return new Info(sym.toString(), pc.minus(sym.getAddress()), HIGH_CONFIDENCE); } } // Now try looking up symbol in loadobject // FIXME: must add support for mapfiles on Win32 and try looking // up there first if possible. Should we hide that behind // LoadObject.closestSymbolToPC and have the ClosestSymbol return // confidence? I think so. On Solaris there is no notion of a // mapfile, and the confidence for closestSymbolToPC will be high // instead of low. int confidence = HIGH_CONFIDENCE; ClosestSymbol cs = lo.closestSymbolToPC(pc); if (cs != null) { // FIXME: currently low confidence (only on Win32) return new Info(cs.getName() + "()", cs.getOffset(), LOW_CONFIDENCE); } // Unknown location return new Info(dbg.getNameOfFile(lo.getName()).toUpperCase() + "! " + pc + "()", -1, HIGH_CONFIDENCE); } }