| /* |
| * Copyright (c) 2000, 2010, 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.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| |
| /** PcDescs map a physical PC (given as offset from start of nmethod) |
| to the corresponding source scope and byte code index. */ |
| |
| public class PCDesc extends VMObject { |
| private static CIntegerField pcOffsetField; |
| private static CIntegerField scopeDecodeOffsetField; |
| private static CIntegerField objDecodeOffsetField; |
| private static CIntegerField pcFlagsField; |
| private static int reexecuteMask; |
| private static int isMethodHandleInvokeMask; |
| private static int returnOopMask; |
| |
| 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("PcDesc"); |
| |
| pcOffsetField = type.getCIntegerField("_pc_offset"); |
| scopeDecodeOffsetField = type.getCIntegerField("_scope_decode_offset"); |
| objDecodeOffsetField = type.getCIntegerField("_obj_decode_offset"); |
| pcFlagsField = type.getCIntegerField("_flags"); |
| |
| reexecuteMask = db.lookupIntConstant("PcDesc::PCDESC_reexecute"); |
| isMethodHandleInvokeMask = db.lookupIntConstant("PcDesc::PCDESC_is_method_handle_invoke"); |
| returnOopMask = db.lookupIntConstant("PcDesc::PCDESC_return_oop"); |
| } |
| |
| public PCDesc(Address addr) { |
| super(addr); |
| } |
| |
| // FIXME: add additional constructor probably needed for ScopeDesc::sender() |
| |
| public int getPCOffset() { |
| return (int) pcOffsetField.getValue(addr); |
| } |
| |
| public int getScopeDecodeOffset() { |
| return ((int) scopeDecodeOffsetField.getValue(addr)); |
| } |
| |
| public int getObjDecodeOffset() { |
| return ((int) objDecodeOffsetField.getValue(addr)); |
| } |
| |
| public Address getRealPC(NMethod code) { |
| return code.codeBegin().addOffsetTo(getPCOffset()); |
| } |
| |
| |
| public boolean getReexecute() { |
| int flags = (int)pcFlagsField.getValue(addr); |
| return (flags & reexecuteMask) != 0; |
| } |
| |
| public boolean isMethodHandleInvoke() { |
| int flags = (int)pcFlagsField.getValue(addr); |
| return (flags & isMethodHandleInvokeMask) != 0; |
| } |
| |
| public void print(NMethod code) { |
| printOn(System.out, code); |
| } |
| |
| public void printOn(PrintStream tty, NMethod code) { |
| tty.println("PCDesc(" + getRealPC(code) + "):"); |
| for (ScopeDesc sd = code.getScopeDescAt(getRealPC(code)); |
| sd != null; |
| sd = sd.sender()) { |
| tty.print(" "); |
| sd.getMethod().printValueOn(tty); |
| tty.print(" @" + sd.getBCI()); |
| tty.print(" reexecute=" + sd.getReexecute()); |
| tty.println(); |
| } |
| } |
| } |