Mercurial > hg > graal-compiler
diff agent/src/share/classes/sun/jvm/hotspot/bugspot/PCFinder.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/bugspot/PCFinder.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,96 @@ +/* + * 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); + } +}