1 /*
  2  * Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.  Oracle designates this
  8  * particular file as subject to the "Classpath" exception as provided
  9  * by Oracle in the LICENSE file that accompanied this code.
 10  *
 11  * This code is distributed in the hope that it will be useful, but WITHOUT
 12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 14  * version 2 for more details (a copy is included in the LICENSE file that
 15  * accompanied this code).
 16  *
 17  * You should have received a copy of the GNU General Public License version
 18  * 2 along with this work; if not, write to the Free Software Foundation,
 19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 20  *
 21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 22  * or visit www.oracle.com if you need additional information or have any
 23  * questions.
 24  */
 25 
 26 package jdk.internal.reflect;
 27 
 28 import java.lang.invoke.MethodHandle;
 29 import java.lang.invoke.MethodType;
 30 import java.lang.reflect.Field;
 31 import java.lang.reflect.Modifier;
 32 
 33 class MethodHandleByteFieldAccessorImpl extends MethodHandleFieldAccessorImpl {
 34     static FieldAccessorImpl fieldAccessor(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly) {
 35         boolean isStatic = Modifier.isStatic(field.getModifiers());
 36         if (isStatic) {
 37             getter = getter.asType(MethodType.methodType(byte.class));
 38             if (setter != null) {
 39                 setter = setter.asType(MethodType.methodType(void.class, byte.class));
 40             }
 41         } else {
 42             getter = getter.asType(MethodType.methodType(byte.class, Object.class));
 43             if (setter != null) {
 44                 setter = setter.asType(MethodType.methodType(void.class, Object.class, byte.class));
 45             }
 46         }
 47         return new MethodHandleByteFieldAccessorImpl(field, getter, setter, isReadOnly, isStatic);
 48     }
 49 
 50     MethodHandleByteFieldAccessorImpl(Field field, MethodHandle getter, MethodHandle setter, boolean isReadOnly, boolean isStatic) {
 51         super(field, getter, setter, isReadOnly, isStatic);
 52     }
 53 
 54     public Object get(Object obj) throws IllegalArgumentException {
 55         return Byte.valueOf(getByte(obj));
 56     }
 57 
 58     public boolean getBoolean(Object obj) throws IllegalArgumentException {
 59         throw newGetBooleanIllegalArgumentException();
 60     }
 61 
 62     public byte getByte(Object obj) throws IllegalArgumentException {
 63         try {
 64             if (isStatic()) {
 65                 return (byte) getter.invokeExact();
 66             } else {
 67                 return (byte) getter.invokeExact(obj);
 68             }
 69         } catch (IllegalArgumentException|NullPointerException e) {
 70             throw e;
 71         } catch (ClassCastException e) {
 72             throw newGetIllegalArgumentException(obj.getClass());
 73         } catch (Throwable e) {
 74             throw new InternalError(e);
 75         }
 76     }
 77 
 78     public char getChar(Object obj) throws IllegalArgumentException {
 79         throw newGetCharIllegalArgumentException();
 80     }
 81 
 82     public short getShort(Object obj) throws IllegalArgumentException {
 83         return getByte(obj);
 84     }
 85 
 86     public int getInt(Object obj) throws IllegalArgumentException {
 87         return getByte(obj);
 88     }
 89 
 90     public long getLong(Object obj) throws IllegalArgumentException {
 91         return getByte(obj);
 92     }
 93 
 94     public float getFloat(Object obj) throws IllegalArgumentException {
 95         return getByte(obj);
 96     }
 97 
 98     public double getDouble(Object obj) throws IllegalArgumentException {
 99         return getByte(obj);
100     }
101 
102     public void set(Object obj, Object value)
103             throws IllegalArgumentException, IllegalAccessException
104     {
105         ensureObj(obj);
106         if (isReadOnly()) {
107             throwFinalFieldIllegalAccessException(value);
108         }
109 
110         if (value == null) {
111             throwSetIllegalArgumentException(value);
112         }
113 
114         if (value instanceof Byte b) {
115             setByte(obj, b.byteValue());
116         } else {
117             throwSetIllegalArgumentException(value);
118         }
119     }
120 
121     public void setBoolean(Object obj, boolean z)
122         throws IllegalArgumentException, IllegalAccessException
123     {
124         throwSetIllegalArgumentException(z);
125     }
126 
127     public void setByte(Object obj, byte b)
128         throws IllegalArgumentException, IllegalAccessException
129     {
130         ensureObj(obj);
131         if (isReadOnly()) {
132             throwFinalFieldIllegalAccessException(b);
133         }
134         try {
135             if (isStatic()) {
136                 setter.invokeExact(b);
137             } else {
138                 setter.invokeExact(obj, b);
139             }
140         } catch (IllegalArgumentException|NullPointerException e) {
141             throw e;
142         } catch (ClassCastException e) {
143             throw newSetIllegalArgumentException(obj.getClass());
144         } catch (Throwable e) {
145             throw new InternalError(e);
146         }
147     }
148 
149     public void setChar(Object obj, char c)
150         throws IllegalArgumentException, IllegalAccessException
151     {
152         throwSetIllegalArgumentException(c);
153     }
154 
155     public void setShort(Object obj, short s)
156         throws IllegalArgumentException, IllegalAccessException
157     {
158         throwSetIllegalArgumentException(s);
159     }
160 
161     public void setInt(Object obj, int i)
162         throws IllegalArgumentException, IllegalAccessException
163     {
164         throwSetIllegalArgumentException(i);
165     }
166 
167     public void setLong(Object obj, long l)
168         throws IllegalArgumentException, IllegalAccessException
169     {
170         throwSetIllegalArgumentException(l);
171     }
172 
173     public void setFloat(Object obj, float f)
174         throws IllegalArgumentException, IllegalAccessException
175     {
176         throwSetIllegalArgumentException(f);
177     }
178 
179     public void setDouble(Object obj, double d)
180         throws IllegalArgumentException, IllegalAccessException
181     {
182         throwSetIllegalArgumentException(d);
183     }
184 }