| /* |
| * Copyright (c) 2000, 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.runtime; |
| |
| import java.io.*; |
| import java.util.*; |
| |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.interpreter.*; |
| import sun.jvm.hotspot.code.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| /** <P> A companion structure used for stack traversal. The |
| RegisterMap contains misc. information needed in order to do |
| correct stack traversal of stack frames. Hence, it must always be |
| passed in as an argument to Frame.sender(RegisterMap). </P> |
| |
| <P> The use of RegisterMaps is slightly different in the |
| Serviceability Agent APIs than in the VM itself. In the VM, a |
| RegisterMap is created either for a particular thread or cloned |
| from another RegisterMap. In these APIs, a JavaThread is the |
| top-level factory for RegisterMaps, and RegisterMaps know how to |
| copy themselves (through either the clone() or copy() |
| methods). </P> */ |
| |
| public abstract class RegisterMap implements Cloneable { |
| /** Location of registers */ |
| protected Address[] location; |
| // FIXME: don't know about LocationValidType |
| protected long[] locationValid; |
| /** Should include argument_oop marked locations for compiler */ |
| protected boolean includeArgumentOops; |
| /** Reference to current thread */ |
| protected JavaThread thread; |
| /** Tells if the register map needs to be updated when traversing the stack */ |
| protected boolean updateMap; |
| /** Location of a frame where the pc is not at a call (NULL if no frame exists) */ |
| protected static int regCount; |
| protected static int locationValidTypeSize; |
| protected static int locationValidSize; |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static void initialize(TypeDataBase db) { |
| regCount = db.lookupIntConstant("ConcreteRegisterImpl::number_of_registers").intValue(); |
| // FIXME: don't know about LocationValidType. The LocationValidType is typedef'ed as julong |
| // so used julong to get the size of LocationValidType. |
| locationValidTypeSize = (int)db.lookupType("julong").getSize() * 8; |
| locationValidSize = (regCount + locationValidTypeSize - 1) / locationValidTypeSize; |
| } |
| |
| protected RegisterMap(JavaThread thread, boolean updateMap) { |
| this.thread = thread; |
| this.updateMap = updateMap; |
| location = new Address[regCount]; |
| locationValid = new long[locationValidSize]; |
| clear(); |
| } |
| |
| /** Makes a copy of map into this */ |
| protected RegisterMap(RegisterMap map) { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(map != null, "RegisterMap must be present"); |
| } |
| this.thread = map.getThread(); |
| this.updateMap = map.getUpdateMap(); |
| this.includeArgumentOops = map.getIncludeArgumentOops(); |
| location = new Address[map.location.length]; |
| locationValid = new long[map.locationValid.length]; |
| initializeFromPD(map); |
| if (updateMap) { |
| for (int i = 0; i < locationValidSize; i++) { |
| long bits = (!getUpdateMap()) ? 0 : map.locationValid[i]; |
| locationValid[i] = bits; |
| // for whichever bits are set, pull in the corresponding map->_location |
| int j = i*locationValidTypeSize; |
| while (bits != 0) { |
| if ((bits & 1) != 0) { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(0 <= j && j < regCount, "range check"); |
| } |
| location[j] = map.location[j]; |
| } |
| bits >>>= 1; |
| j += 1; |
| } |
| } |
| } |
| } |
| |
| public abstract Object clone(); |
| |
| public RegisterMap copy() { |
| return (RegisterMap) clone(); |
| } |
| |
| public void clear() { |
| setIncludeArgumentOops(true); |
| if (!VM.getVM().isCore()) { |
| if (updateMap) { |
| for (int i = 0; i < locationValid.length; i++) { |
| locationValid[i] = 0; |
| } |
| clearPD(); |
| } else { |
| initializePD(); |
| } |
| } |
| } |
| |
| public Address getLocation(VMReg reg) { |
| int i = reg.getValue(); |
| int index = i / locationValidTypeSize; |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(0 <= i && i < regCount, "sanity check"); |
| Assert.that(0 <= index && index < locationValidSize, "sanity check"); |
| } |
| if ((locationValid[index] & (1 << i % locationValidTypeSize)) != 0) { |
| return location[i]; |
| } else { |
| return getLocationPD(reg); |
| } |
| } |
| |
| public void setLocation(VMReg reg, Address loc) { |
| int i = reg.getValue(); |
| int index = i / locationValidTypeSize; |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(0 <= i && i < regCount, "sanity check"); |
| Assert.that(0 <= index && index < locationValidSize, "sanity check"); |
| Assert.that(updateMap, "updating map that does not need updating"); |
| } |
| location[i] = loc; |
| locationValid[index] |= (1 << (i % locationValidTypeSize)); |
| } |
| |
| public boolean getIncludeArgumentOops() { |
| return includeArgumentOops; |
| } |
| |
| public void setIncludeArgumentOops(boolean f) { |
| includeArgumentOops = f; |
| } |
| |
| public JavaThread getThread() { |
| return thread; |
| } |
| |
| public boolean getUpdateMap() { |
| return updateMap; |
| } |
| |
| public void print() { |
| printOn(System.out); |
| } |
| |
| public void printOn(PrintStream tty) { |
| tty.println("Register map"); |
| for (int i = 0; i < location.length; i++) { |
| Address src = getLocation(new VMReg(i)); |
| if (src != null) { |
| tty.print(" " + VMRegImpl.getRegisterName(i) + |
| " [" + src + "] = "); |
| if (src.andWithMask(VM.getVM().getAddressSize() - 1) != null) { |
| tty.print("<misaligned>"); |
| } else { |
| tty.print(src.getAddressAt(0)); |
| } |
| } |
| } |
| } |
| |
| /** Platform-dependent clear() functionality */ |
| protected abstract void clearPD(); |
| /** Platform-dependent initialize() functionality */ |
| protected abstract void initializePD(); |
| /** Platform-dependent initializeFrom() functionality */ |
| protected abstract void initializeFromPD(RegisterMap map); |
| /** Platform-dependent getLocation() functionality */ |
| protected abstract Address getLocationPD(VMReg reg); |
| } |