| /* |
| * Copyright (c) 2000, 2008, 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.compiler; |
| |
| import java.util.*; |
| |
| import sun.jvm.hotspot.code.*; |
| import sun.jvm.hotspot.runtime.*; |
| import sun.jvm.hotspot.types.*; |
| import sun.jvm.hotspot.utilities.*; |
| |
| public class OopMapValue { |
| private short value; |
| private short contentReg; |
| |
| /** Read from target VM; located in compiler/oopMap.hpp */ |
| // How bits are organized |
| static int TYPE_BITS; |
| static int REGISTER_BITS; |
| static int TYPE_SHIFT; |
| static int REGISTER_SHIFT; |
| static int TYPE_MASK; |
| static int TYPE_MASK_IN_PLACE; |
| static int REGISTER_MASK; |
| static int REGISTER_MASK_IN_PLACE; |
| |
| // Types of OopValues |
| static int UNUSED_VALUE; |
| static int OOP_VALUE; |
| static int NARROWOOP_VALUE; |
| static int CALLEE_SAVED_VALUE; |
| static int DERIVED_OOP_VALUE; |
| |
| static { |
| VM.registerVMInitializedObserver(new Observer() { |
| public void update(Observable o, Object data) { |
| initialize(VM.getVM().getTypeDataBase()); |
| } |
| }); |
| } |
| |
| private static void initialize(TypeDataBase db) { |
| TYPE_BITS = db.lookupIntConstant("OopMapValue::type_bits").intValue(); |
| REGISTER_BITS = db.lookupIntConstant("OopMapValue::register_bits").intValue(); |
| TYPE_SHIFT = db.lookupIntConstant("OopMapValue::type_shift").intValue(); |
| REGISTER_SHIFT = db.lookupIntConstant("OopMapValue::register_shift").intValue(); |
| TYPE_MASK = db.lookupIntConstant("OopMapValue::type_mask").intValue(); |
| TYPE_MASK_IN_PLACE = db.lookupIntConstant("OopMapValue::type_mask_in_place").intValue(); |
| REGISTER_MASK = db.lookupIntConstant("OopMapValue::register_mask").intValue(); |
| REGISTER_MASK_IN_PLACE = db.lookupIntConstant("OopMapValue::register_mask_in_place").intValue(); |
| UNUSED_VALUE = db.lookupIntConstant("OopMapValue::unused_value").intValue(); |
| OOP_VALUE = db.lookupIntConstant("OopMapValue::oop_value").intValue(); |
| NARROWOOP_VALUE = db.lookupIntConstant("OopMapValue::narrowoop_value").intValue(); |
| CALLEE_SAVED_VALUE = db.lookupIntConstant("OopMapValue::callee_saved_value").intValue(); |
| DERIVED_OOP_VALUE = db.lookupIntConstant("OopMapValue::derived_oop_value").intValue(); |
| } |
| |
| public static abstract class OopTypes { |
| public static final OopTypes UNUSED_VALUE = new OopTypes() { int getValue() { return OopMapValue.UNUSED_VALUE; }}; |
| public static final OopTypes OOP_VALUE = new OopTypes() { int getValue() { return OopMapValue.OOP_VALUE; }}; |
| public static final OopTypes NARROWOOP_VALUE = new OopTypes() { int getValue() { return OopMapValue.NARROWOOP_VALUE; }}; |
| public static final OopTypes CALLEE_SAVED_VALUE = new OopTypes() { int getValue() { return OopMapValue.CALLEE_SAVED_VALUE; }}; |
| public static final OopTypes DERIVED_OOP_VALUE = new OopTypes() { int getValue() { return OopMapValue.DERIVED_OOP_VALUE; }}; |
| |
| abstract int getValue(); |
| protected OopTypes() {} |
| } |
| |
| public OopMapValue() { setValue((short) 0); setContentReg(new VMReg(0)); } |
| public OopMapValue(VMReg reg, OopTypes t) { setReg(reg); setType(t); } |
| public OopMapValue(VMReg reg, OopTypes t, VMReg reg2) { setReg(reg); setType(t); setContentReg(reg2); } |
| public OopMapValue(CompressedReadStream stream) { readFrom(stream); } |
| |
| public void readFrom(CompressedReadStream stream) { |
| setValue((short) stream.readInt()); |
| if (isCalleeSaved() || isDerivedOop()) { |
| setContentReg(new VMReg(stream.readInt())); |
| } |
| } |
| |
| // Querying |
| public boolean isOop() { return (getValue() & TYPE_MASK_IN_PLACE) == OOP_VALUE; } |
| public boolean isNarrowOop() { return (getValue() & TYPE_MASK_IN_PLACE) == NARROWOOP_VALUE; } |
| public boolean isCalleeSaved() { return (getValue() & TYPE_MASK_IN_PLACE) == CALLEE_SAVED_VALUE; } |
| public boolean isDerivedOop() { return (getValue() & TYPE_MASK_IN_PLACE) == DERIVED_OOP_VALUE; } |
| |
| public VMReg getReg() { return new VMReg((getValue() & REGISTER_MASK_IN_PLACE) >> REGISTER_SHIFT); } |
| public void setReg(VMReg r) { setValue((short) (r.getValue() << REGISTER_SHIFT | (getValue() & TYPE_MASK_IN_PLACE))); } |
| |
| public OopTypes getType() { |
| int which = (getValue() & TYPE_MASK_IN_PLACE); |
| if (which == UNUSED_VALUE) return OopTypes.UNUSED_VALUE; |
| else if (which == OOP_VALUE) return OopTypes.OOP_VALUE; |
| else if (which == NARROWOOP_VALUE) return OopTypes.NARROWOOP_VALUE; |
| else if (which == CALLEE_SAVED_VALUE) return OopTypes.CALLEE_SAVED_VALUE; |
| else if (which == DERIVED_OOP_VALUE) return OopTypes.DERIVED_OOP_VALUE; |
| else throw new InternalError("unknown which " + which + " (TYPE_MASK_IN_PLACE = " + TYPE_MASK_IN_PLACE + ")"); |
| } |
| public void setType(OopTypes t) { setValue((short) ((getValue() & REGISTER_MASK_IN_PLACE) | t.getValue())); } |
| |
| public VMReg getContentReg() { return new VMReg(contentReg); } |
| public void setContentReg(VMReg r) { contentReg = (short) r.getValue(); } |
| |
| /** Physical location queries */ |
| public boolean isRegisterLoc() { return (getReg().lessThan(VM.getVM().getVMRegImplInfo().getStack0())); } |
| public boolean isStackLoc() { return (getReg().greaterThanOrEqual(VM.getVM().getVMRegImplInfo().getStack0())); } |
| |
| /** Returns offset from sp. */ |
| public int getStackOffset() { |
| if (Assert.ASSERTS_ENABLED) { |
| Assert.that(isStackLoc(), "must be stack location"); |
| } |
| return getReg().minus(VM.getVM().getVMRegImplInfo().getStack0()); |
| } |
| |
| //-------------------------------------------------------------------------------- |
| // Internals only below this point |
| // |
| |
| private void setValue(short value) { |
| this.value = value; |
| } |
| |
| private int getValue() { |
| return value; |
| } |
| } |