| /* |
| * Copyright (c) 2000, 2009, 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 sun.jvm.hotspot.utilities.*; |
| |
| /** <P> Classes used for serializing debugging information. These |
| abstractions are introducted to provide symmetric read and write |
| operations. </P> |
| |
| <P> |
| <UL> |
| <LI> ScopeValue: describes the value of a variable/expression in a scope |
| <UL> |
| <LI> LocationValue: describes a value in a given location (in frame or register) |
| <LI> ConstantValue: describes a constant |
| </UL> |
| </UL> |
| </P> */ |
| |
| public abstract class ScopeValue { |
| // Package private enumeration values (FIXME: read from target VM) |
| static final int LOCATION_CODE = 0; |
| static final int CONSTANT_INT_CODE = 1; |
| static final int CONSTANT_OOP_CODE = 2; |
| static final int CONSTANT_LONG_CODE = 3; |
| static final int CONSTANT_DOUBLE_CODE = 4; |
| static final int CONSTANT_OBJECT_CODE = 5; |
| static final int CONSTANT_OBJECT_ID_CODE = 6; |
| |
| public boolean isLocation() { return false; } |
| public boolean isConstantInt() { return false; } |
| public boolean isConstantDouble() { return false; } |
| public boolean isConstantLong() { return false; } |
| public boolean isConstantOop() { return false; } |
| public boolean isObject() { return false; } |
| |
| public static ScopeValue readFrom(DebugInfoReadStream stream) { |
| switch (stream.readInt()) { |
| case LOCATION_CODE: |
| return new LocationValue(stream); |
| case CONSTANT_INT_CODE: |
| return new ConstantIntValue(stream); |
| case CONSTANT_OOP_CODE: |
| return new ConstantOopReadValue(stream); |
| case CONSTANT_LONG_CODE: |
| return new ConstantLongValue(stream); |
| case CONSTANT_DOUBLE_CODE: |
| return new ConstantDoubleValue(stream); |
| case CONSTANT_OBJECT_CODE: |
| return stream.readObjectValue(); |
| case CONSTANT_OBJECT_ID_CODE: |
| return stream.getCachedObject(); |
| default: |
| Assert.that(false, "should not reach here"); |
| return null; |
| } |
| } |
| |
| public abstract void printOn(PrintStream tty); |
| } |