Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/code/ScopeDesc.java @ 554:78144dc3db03
Merge
author | never |
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date | Tue, 13 Jan 2009 14:02:19 -0800 |
parents | a61af66fc99e |
children | b109e761e927 |
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/* * Copyright 2000-2005 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.code; import java.io.*; import java.util.*; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.runtime.*; /** ScopeDescs contain the information that makes source-level debugging of nmethods possible; each scopeDesc describes a method activation */ public class ScopeDesc { /** NMethod information */ private NMethod code; private Method method; private int bci; /** Decoding offsets */ private int decodeOffset; private int senderDecodeOffset; private int localsDecodeOffset; private int expressionsDecodeOffset; private int monitorsDecodeOffset; public ScopeDesc(NMethod code, int decodeOffset) { this.code = code; this.decodeOffset = decodeOffset; // Decode header DebugInfoReadStream stream = streamAt(decodeOffset); senderDecodeOffset = stream.readInt(); method = (Method) VM.getVM().getObjectHeap().newOop(stream.readOopHandle()); bci = stream.readBCI(); // Decode offsets for body and sender localsDecodeOffset = stream.readInt(); expressionsDecodeOffset = stream.readInt(); monitorsDecodeOffset = stream.readInt(); } public NMethod getNMethod() { return code; } public Method getMethod() { return method; } public int getBCI() { return bci; } /** Returns a List<ScopeValue> */ public List getLocals() { return decodeScopeValues(localsDecodeOffset); } /** Returns a List<ScopeValue> */ public List getExpressions() { return decodeScopeValues(expressionsDecodeOffset); } /** Returns a List<MonitorValue> */ public List getMonitors() { return decodeMonitorValues(monitorsDecodeOffset); } /** Stack walking. Returns null if this is the outermost scope. */ public ScopeDesc sender() { if (isTop()) { return null; } return new ScopeDesc(code, senderDecodeOffset); } /** Returns where the scope was decoded */ public int getDecodeOffset() { return decodeOffset; } /** Tells whether sender() returns null */ public boolean isTop() { return (senderDecodeOffset == DebugInformationRecorder.SERIALIZED_NULL); } public boolean equals(Object arg) { if (arg == null) { return false; } if (!(arg instanceof ScopeDesc)) { return false; } ScopeDesc sd = (ScopeDesc) arg; return (sd.method.equals(method) && (sd.bci == bci)); } public void printValue() { printValueOn(System.out); } public void printValueOn(PrintStream tty) { tty.print("ScopeDesc for "); method.printValueOn(tty); tty.println(" @bci " + bci); } // FIXME: add more accessors //-------------------------------------------------------------------------------- // Internals only below this point // private DebugInfoReadStream streamAt(int decodeOffset) { return new DebugInfoReadStream(code, decodeOffset); } /** Returns a List<ScopeValue> or null if no values were present */ private List decodeScopeValues(int decodeOffset) { if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) { return null; } DebugInfoReadStream stream = streamAt(decodeOffset); int length = stream.readInt(); List res = new ArrayList(length); for (int i = 0; i < length; i++) { res.add(ScopeValue.readFrom(stream)); } return res; } /** Returns a List<MonitorValue> or null if no values were present */ private List decodeMonitorValues(int decodeOffset) { if (decodeOffset == DebugInformationRecorder.SERIALIZED_NULL) { return null; } DebugInfoReadStream stream = streamAt(decodeOffset); int length = stream.readInt(); List res = new ArrayList(length); for (int i = 0; i < length; i++) { res.add(new MonitorValue(stream)); } return res; } }