Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/debugger/linux/x86/LinuxX86CFrame.java @ 642:660978a2a31a
6791178: Specialize for zero as the compressed oop vm heap base
Summary: Use zero based compressed oops if java heap is below 32gb and unscaled compressed oops if java heap is below 4gb.
Reviewed-by: never, twisti, jcoomes, coleenp
author | kvn |
---|---|
date | Thu, 12 Mar 2009 10:37:46 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2003 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.debugger.linux.x86; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.debugger.linux.*; import sun.jvm.hotspot.debugger.cdbg.*; import sun.jvm.hotspot.debugger.cdbg.basic.*; final public class LinuxX86CFrame extends BasicCFrame { // package/class internals only public LinuxX86CFrame(LinuxDebugger dbg, Address ebp, Address pc) { super(dbg.getCDebugger()); this.ebp = ebp; this.pc = pc; this.dbg = dbg; } // override base class impl to avoid ELF parsing public ClosestSymbol closestSymbolToPC() { // try native lookup in debugger. return dbg.lookup(dbg.getAddressValue(pc())); } public Address pc() { return pc; } public Address localVariableBase() { return ebp; } public CFrame sender() { if (ebp == null) { return null; } Address nextEBP = ebp.getAddressAt( 0 * ADDRESS_SIZE); if (nextEBP == null) { return null; } Address nextPC = ebp.getAddressAt( 1 * ADDRESS_SIZE); if (nextPC == null) { return null; } return new LinuxX86CFrame(dbg, nextEBP, nextPC); } private static final int ADDRESS_SIZE = 4; private Address pc; private Address ebp; private LinuxDebugger dbg; }