Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/code/VMRegImpl.java @ 7353:b5280041f59e
Experiment with soft alignment for branch targets.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Sun, 13 Jan 2013 19:32:16 +0100 |
parents | c18cbe5936b8 |
children |
line wrap: on
line source
/* * Copyright (c) 2006, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.code; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.runtime.*; import sun.jvm.hotspot.types.*; import sun.jvm.hotspot.utilities.*; public class VMRegImpl { private static VMReg stack0; private static int stack0Val; private static Address stack0Addr; private static AddressField regNameField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static void initialize(TypeDataBase db) { Type type = db.lookupType("VMRegImpl"); AddressField stack0Field = type.getAddressField("stack0"); stack0Addr = stack0Field.getValue(); stack0Val = (int) stack0Addr.hashCode(); stack0 = new VMReg(stack0Val); regNameField = type.getAddressField("regName[0]"); } public static VMReg getStack0() { return stack0; } public static String getRegisterName(int index) { if (Assert.ASSERTS_ENABLED) { Assert.that(index >= 0 && index < stack0Val, "invalid index : " + index); } Address regName = regNameField.getStaticFieldAddress(); long addrSize = VM.getVM().getAddressSize(); return CStringUtilities.getString(regName.getAddressAt(index * addrSize)); } }