Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/FieldsScanner.java @ 21541:5e868236654f
moved UnsafeAccess to com.oracle.jvmci.common (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 25 May 2015 22:17:10 +0200 |
parents | 8cc395785d0a |
children | 0e095e2c24e2 |
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/* * 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 com.oracle.graal.compiler.common; import static com.oracle.jvmci.common.UnsafeAccess.*; import java.lang.reflect.*; import java.util.*; import sun.misc.*; /** * 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. */ 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())); } }