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/*
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* Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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43972
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package org.graalvm.compiler.core.common;
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import static org.graalvm.compiler.core.common.UnsafeAccess.UNSAFE;
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import java.util.ArrayList;
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import java.util.Collections;
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import org.graalvm.compiler.debug.GraalError;
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import sun.misc.Unsafe;
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/**
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* Describes fields in a class, primarily for access via {@link Unsafe}.
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*/
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public class Fields {
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/**
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* Offsets used with {@link Unsafe} to access the fields.
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*/
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protected final long[] offsets;
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/**
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* The names of the fields.
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*/
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private final String[] names;
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/**
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* The types of the fields.
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*/
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private final Class<?>[] types;
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private final Class<?>[] declaringClasses;
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public static Fields forClass(Class<?> clazz, Class<?> endClazz, boolean includeTransient, FieldsScanner.CalcOffset calcOffset) {
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FieldsScanner scanner = new FieldsScanner(calcOffset == null ? new FieldsScanner.DefaultCalcOffset() : calcOffset);
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scanner.scan(clazz, endClazz, includeTransient);
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return new Fields(scanner.data);
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}
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public Fields(ArrayList<? extends FieldsScanner.FieldInfo> fields) {
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Collections.sort(fields);
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this.offsets = new long[fields.size()];
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this.names = new String[offsets.length];
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this.types = new Class<?>[offsets.length];
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this.declaringClasses = new Class<?>[offsets.length];
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int index = 0;
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for (FieldsScanner.FieldInfo f : fields) {
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offsets[index] = f.offset;
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names[index] = f.name;
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types[index] = f.type;
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declaringClasses[index] = f.declaringClass;
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index++;
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}
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}
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/**
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* Gets the number of fields represented by this object.
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*/
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public int getCount() {
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return offsets.length;
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}
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public static void translateInto(Fields fields, ArrayList<FieldsScanner.FieldInfo> infos) {
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for (int index = 0; index < fields.getCount(); index++) {
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infos.add(new FieldsScanner.FieldInfo(fields.offsets[index], fields.names[index], fields.types[index], fields.declaringClasses[index]));
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}
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}
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/**
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* Function enabling an object field value to be replaced with another value when being copied
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* within {@link Fields#copy(Object, Object, ObjectTransformer)}.
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*/
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@FunctionalInterface
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public interface ObjectTransformer {
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Object apply(int index, Object from);
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}
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/**
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* Copies fields from {@code from} to {@code to}, both of which must be of the same type.
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*
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* @param from the object from which the fields should be copied
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* @param to the object to which the fields should be copied
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*/
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public void copy(Object from, Object to) {
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copy(from, to, null);
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}
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/**
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* Copies fields from {@code from} to {@code to}, both of which must be of the same type.
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*
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* @param from the object from which the fields should be copied
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* @param to the object to which the fields should be copied
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* @param trans function to applied to object field values as they are copied. If {@code null},
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* the value is copied unchanged.
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*/
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public void copy(Object from, Object to, ObjectTransformer trans) {
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assert from.getClass() == to.getClass();
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for (int index = 0; index < offsets.length; index++) {
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long offset = offsets[index];
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Class<?> type = types[index];
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if (type.isPrimitive()) {
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if (type == Integer.TYPE) {
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UNSAFE.putInt(to, offset, UNSAFE.getInt(from, offset));
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} else if (type == Long.TYPE) {
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UNSAFE.putLong(to, offset, UNSAFE.getLong(from, offset));
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} else if (type == Boolean.TYPE) {
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UNSAFE.putBoolean(to, offset, UNSAFE.getBoolean(from, offset));
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} else if (type == Float.TYPE) {
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UNSAFE.putFloat(to, offset, UNSAFE.getFloat(from, offset));
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} else if (type == Double.TYPE) {
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UNSAFE.putDouble(to, offset, UNSAFE.getDouble(from, offset));
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} else if (type == Short.TYPE) {
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UNSAFE.putShort(to, offset, UNSAFE.getShort(from, offset));
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} else if (type == Character.TYPE) {
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UNSAFE.putChar(to, offset, UNSAFE.getChar(from, offset));
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} else if (type == Byte.TYPE) {
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UNSAFE.putByte(to, offset, UNSAFE.getByte(from, offset));
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} else {
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assert false : "unhandled property type: " + type;
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}
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} else {
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Object obj = UNSAFE.getObject(from, offset);
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UNSAFE.putObject(to, offset, trans == null ? obj : trans.apply(index, obj));
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}
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}
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}
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/**
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* Gets the value of a field for a given object.
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*
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* @param object the object whose field is to be read
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* @param index the index of the field (between 0 and {@link #getCount()})
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* @return the value of the specified field which will be boxed if the field type is primitive
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*/
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public Object get(Object object, int index) {
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long offset = offsets[index];
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Class<?> type = types[index];
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Object value = null;
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if (type.isPrimitive()) {
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if (type == Integer.TYPE) {
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value = UNSAFE.getInt(object, offset);
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} else if (type == Long.TYPE) {
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value = UNSAFE.getLong(object, offset);
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} else if (type == Boolean.TYPE) {
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value = UNSAFE.getBoolean(object, offset);
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} else if (type == Float.TYPE) {
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value = UNSAFE.getFloat(object, offset);
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} else if (type == Double.TYPE) {
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value = UNSAFE.getDouble(object, offset);
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} else if (type == Short.TYPE) {
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value = UNSAFE.getShort(object, offset);
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} else if (type == Character.TYPE) {
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value = UNSAFE.getChar(object, offset);
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} else if (type == Byte.TYPE) {
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value = UNSAFE.getByte(object, offset);
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} else {
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assert false : "unhandled property type: " + type;
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}
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} else {
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value = UNSAFE.getObject(object, offset);
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}
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return value;
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}
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/**
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* Gets the value of a field for a given object.
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*
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* @param object the object whose field is to be read
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* @param index the index of the field (between 0 and {@link #getCount()})
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* @return the value of the specified field which will be boxed if the field type is primitive
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*/
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public long getRawPrimitive(Object object, int index) {
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long offset = offsets[index];
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Class<?> type = types[index];
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if (type == Integer.TYPE) {
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return UNSAFE.getInt(object, offset);
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} else if (type == Long.TYPE) {
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return UNSAFE.getLong(object, offset);
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} else if (type == Boolean.TYPE) {
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return UNSAFE.getBoolean(object, offset) ? 1 : 0;
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} else if (type == Float.TYPE) {
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return Float.floatToRawIntBits(UNSAFE.getFloat(object, offset));
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} else if (type == Double.TYPE) {
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return Double.doubleToRawLongBits(UNSAFE.getDouble(object, offset));
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} else if (type == Short.TYPE) {
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return UNSAFE.getShort(object, offset);
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} else if (type == Character.TYPE) {
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return UNSAFE.getChar(object, offset);
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} else if (type == Byte.TYPE) {
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return UNSAFE.getByte(object, offset);
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} else {
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throw GraalError.shouldNotReachHere();
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}
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}
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/**
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* Determines if a field in the domain of this object is the same as the field denoted by the
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* same index in another {@link Fields} object.
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*/
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public boolean isSame(Fields other, int index) {
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return other.offsets[index] == offsets[index];
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}
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public long[] getOffsets() {
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return offsets;
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}
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/**
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* Gets the name of a field.
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*
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* @param index index of a field
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*/
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public String getName(int index) {
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return names[index];
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}
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/**
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* Gets the type of a field.
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*
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* @param index index of a field
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*/
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public Class<?> getType(int index) {
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return types[index];
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}
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public Class<?> getDeclaringClass(int index) {
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return declaringClasses[index];
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}
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/**
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* Checks that a given field is assignable from a given value.
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*
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* @param index the index of the field to check
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* @param value a value that will be assigned to the field
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*/
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private boolean checkAssignableFrom(Object object, int index, Object value) {
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assert value == null || getType(index).isAssignableFrom(value.getClass()) : String.format("Field %s.%s of type %s is not assignable from %s", object.getClass().getSimpleName(),
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getName(index), getType(index).getSimpleName(), value.getClass().getSimpleName());
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return true;
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}
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public void set(Object object, int index, Object value) {
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long offset = offsets[index];
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Class<?> type = types[index];
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if (type.isPrimitive()) {
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if (type == Integer.TYPE) {
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UNSAFE.putInt(object, offset, (Integer) value);
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} else if (type == Long.TYPE) {
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UNSAFE.putLong(object, offset, (Long) value);
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} else if (type == Boolean.TYPE) {
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UNSAFE.putBoolean(object, offset, (Boolean) value);
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} else if (type == Float.TYPE) {
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UNSAFE.putFloat(object, offset, (Float) value);
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} else if (type == Double.TYPE) {
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UNSAFE.putDouble(object, offset, (Double) value);
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} else if (type == Short.TYPE) {
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UNSAFE.putShort(object, offset, (Short) value);
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} else if (type == Character.TYPE) {
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UNSAFE.putChar(object, offset, (Character) value);
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} else if (type == Byte.TYPE) {
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UNSAFE.putByte(object, offset, (Byte) value);
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} else {
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assert false : "unhandled property type: " + type;
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}
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} else {
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assert checkAssignableFrom(object, index, value);
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UNSAFE.putObject(object, offset, value);
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}
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}
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public void setRawPrimitive(Object object, int index, long value) {
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long offset = offsets[index];
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Class<?> type = types[index];
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if (type == Integer.TYPE) {
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UNSAFE.putInt(object, offset, (int) value);
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} else if (type == Long.TYPE) {
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UNSAFE.putLong(object, offset, value);
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} else if (type == Boolean.TYPE) {
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UNSAFE.putBoolean(object, offset, value != 0);
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} else if (type == Float.TYPE) {
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UNSAFE.putFloat(object, offset, Float.intBitsToFloat((int) value));
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} else if (type == Double.TYPE) {
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UNSAFE.putDouble(object, offset, Double.longBitsToDouble(value));
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} else if (type == Short.TYPE) {
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UNSAFE.putShort(object, offset, (short) value);
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} else if (type == Character.TYPE) {
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UNSAFE.putChar(object, offset, (char) value);
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} else if (type == Byte.TYPE) {
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UNSAFE.putByte(object, offset, (byte) value);
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} else {
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throw GraalError.shouldNotReachHere();
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}
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}
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@Override
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public String toString() {
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StringBuilder sb = new StringBuilder(getClass().getSimpleName()).append('[');
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appendFields(sb);
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return sb.append(']').toString();
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}
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public void appendFields(StringBuilder sb) {
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for (int i = 0; i < offsets.length; i++) {
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sb.append(i == 0 ? "" : ", ").append(getDeclaringClass(i).getSimpleName()).append('.').append(getName(i)).append('@').append(offsets[i]);
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}
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}
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public boolean getBoolean(Object n, int i) {
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assert types[i] == boolean.class;
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return UNSAFE.getBoolean(n, offsets[i]);
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}
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public byte getByte(Object n, int i) {
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assert types[i] == byte.class;
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return UNSAFE.getByte(n, offsets[i]);
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}
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public short getShort(Object n, int i) {
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assert types[i] == short.class;
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return UNSAFE.getShort(n, offsets[i]);
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}
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public char getChar(Object n, int i) {
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assert types[i] == char.class;
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return UNSAFE.getChar(n, offsets[i]);
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}
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public int getInt(Object n, int i) {
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assert types[i] == int.class;
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return UNSAFE.getInt(n, offsets[i]);
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}
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public long getLong(Object n, int i) {
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assert types[i] == long.class;
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return UNSAFE.getLong(n, offsets[i]);
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}
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public float getFloat(Object n, int i) {
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assert types[i] == float.class;
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return UNSAFE.getFloat(n, offsets[i]);
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}
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public double getDouble(Object n, int i) {
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assert types[i] == double.class;
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return UNSAFE.getDouble(n, offsets[i]);
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}
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public Object getObject(Object object, int i) {
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assert !types[i].isPrimitive();
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return UNSAFE.getObject(object, offsets[i]);
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}
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public void putObject(Object object, int i, Object value) {
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assert checkAssignableFrom(object, i, value);
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UNSAFE.putObject(object, offsets[i], value);
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}
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}
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