| /* |
| * Copyright (c) 2014, 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 org.graalvm.compiler.core.common; |
| |
| import static org.graalvm.compiler.core.common.UnsafeAccess.UNSAFE; |
| |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Modifier; |
| import java.util.ArrayList; |
| |
| import sun.misc.Unsafe; |
| |
| /** |
| * Scans the fields in a class hierarchy. |
| */ |
| public class FieldsScanner { |
| |
| /** |
| * Determines the offset (in bytes) of a field. |
| */ |
| public interface CalcOffset { |
| |
| long getOffset(Field field); |
| } |
| |
| /** |
| * Determines the offset (in bytes) of a field using {@link Unsafe#objectFieldOffset(Field)}. |
| */ |
| public static class DefaultCalcOffset implements CalcOffset { |
| |
| @Override |
| public long getOffset(Field field) { |
| return UNSAFE.objectFieldOffset(field); |
| } |
| } |
| |
| /** |
| * Describes a field in a class during {@linkplain FieldsScanner scanning}. |
| */ |
| public static class FieldInfo implements Comparable<FieldInfo> { |
| public final long offset; |
| public final String name; |
| public final Class<?> type; |
| public final Class<?> declaringClass; |
| |
| public FieldInfo(long offset, String name, Class<?> type, Class<?> declaringClass) { |
| this.offset = offset; |
| this.name = name; |
| this.type = type; |
| this.declaringClass = declaringClass; |
| } |
| |
| /** |
| * Sorts fields in ascending order by their {@link #offset}s. |
| */ |
| @Override |
| public int compareTo(FieldInfo o) { |
| return offset < o.offset ? -1 : (offset > o.offset ? 1 : 0); |
| } |
| |
| @Override |
| public String toString() { |
| return "[" + offset + "]" + name + ":" + type.getSimpleName(); |
| } |
| } |
| |
| private final FieldsScanner.CalcOffset calc; |
| |
| /** |
| * Fields not belonging to a more specific category defined by scanner subclasses are added to |
| * this list. |
| */ |
| public final ArrayList<FieldsScanner.FieldInfo> data = new ArrayList<>(); |
| |
| public FieldsScanner(FieldsScanner.CalcOffset calc) { |
| this.calc = calc; |
| } |
| |
| /** |
| * Scans the fields in a class hierarchy. |
| * |
| * @param clazz the class at which to start scanning |
| * @param endClazz scanning stops when this class is encountered (i.e. {@code endClazz} is not |
| * scanned) |
| */ |
| public void scan(Class<?> clazz, Class<?> endClazz, boolean includeTransient) { |
| Class<?> currentClazz = clazz; |
| while (currentClazz != endClazz) { |
| for (Field field : currentClazz.getDeclaredFields()) { |
| if (Modifier.isStatic(field.getModifiers())) { |
| continue; |
| } |
| if (!includeTransient && Modifier.isTransient(field.getModifiers())) { |
| continue; |
| } |
| long offset = calc.getOffset(field); |
| scanField(field, offset); |
| } |
| currentClazz = currentClazz.getSuperclass(); |
| } |
| } |
| |
| protected void scanField(Field field, long offset) { |
| data.add(new FieldsScanner.FieldInfo(offset, field.getName(), field.getType(), field.getDeclaringClass())); |
| } |
| } |