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/*
* Copyright (c) 2009, 2013, 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 test.sun.invoke.util;
import sun.invoke.util.ValueConversions;
import sun.invoke.util.Wrapper;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.MethodHandle;
import java.io.Serializable;
import java.util.Arrays;
import org.junit.Test;
import static org.junit.Assert.*;
/* @test
* @summary unit tests for value-type conversion utilities
* @modules java.base/sun.invoke.util
* @compile -XDignore.symbol.file ValueConversionsTest.java
* @run junit/othervm test.sun.invoke.util.ValueConversionsTest
*/
/**
*
* @author jrose
*/
public class ValueConversionsTest {
@Test
public void testUnbox() throws Throwable {
testUnbox(false);
}
@Test
public void testUnboxCast() throws Throwable {
testUnbox(true);
}
private void testUnbox(boolean doCast) throws Throwable {
for (Wrapper dst : Wrapper.values()) {
for (Wrapper src : Wrapper.values()) {
testUnbox(doCast, dst, src);
}
}
}
private void testUnbox(boolean doCast, Wrapper dst, Wrapper src) throws Throwable {
boolean expectThrow = !doCast && !dst.isConvertibleFrom(src);
if (dst == Wrapper.OBJECT || src == Wrapper.OBJECT) return; // must have prims
if (dst == Wrapper.VOID || src == Wrapper.VOID ) return; // must have values
if (dst == Wrapper.OBJECT)
expectThrow = false; // everything (even VOID==null here) converts to OBJECT
try {
for (int n = -5; n < 10; n++) {
Object box = src.wrap(n);
switch (src) {
case VOID: assertEquals(box, null); break;
case OBJECT: box = box.toString(); break;
case SHORT: assertEquals(box.getClass(), Short.class); break;
default: assertEquals(box.getClass(), src.wrapperType()); break;
}
MethodHandle unboxer;
if (doCast)
unboxer = ValueConversions.unboxCast(dst);
else
unboxer = ValueConversions.unboxWiden(dst);
Object expResult = (box == null) ? dst.zero() : dst.wrap(box);
Object result = null;
switch (dst) {
case INT: result = (int) unboxer.invokeExact(box); break;
case LONG: result = (long) unboxer.invokeExact(box); break;
case FLOAT: result = (float) unboxer.invokeExact(box); break;
case DOUBLE: result = (double) unboxer.invokeExact(box); break;
case CHAR: result = (char) unboxer.invokeExact(box); break;
case BYTE: result = (byte) unboxer.invokeExact(box); break;
case SHORT: result = (short) unboxer.invokeExact(box); break;
case BOOLEAN: result = (boolean) unboxer.invokeExact(box); break;
}
if (expectThrow) {
expResult = "(need an exception)";
}
assertEquals("(doCast,expectThrow,dst,src,n,box)="+Arrays.asList(doCast,expectThrow,dst,src,n,box),
expResult, result);
}
} catch (RuntimeException ex) {
if (expectThrow) return;
System.out.println("Unexpected throw for (doCast,expectThrow,dst,src)="+Arrays.asList(doCast,expectThrow,dst,src));
throw ex;
}
}
@Test
public void testBox() throws Throwable {
for (Wrapper w : Wrapper.values()) {
if (w == Wrapper.VOID) continue; // skip this; no unboxed form
if (w == Wrapper.OBJECT) continue; // skip this; already unboxed
for (int n = -5; n < 10; n++) {
Object box = w.wrap(n);
MethodHandle boxer = ValueConversions.boxExact(w);
Object expResult = box;
Object result = null;
switch (w) {
case INT: result = (Integer) boxer.invokeExact(/*int*/n); break;
case LONG: result = (Long) boxer.invokeExact((long)n); break;
case FLOAT: result = (Float) boxer.invokeExact((float)n); break;
case DOUBLE: result = (Double) boxer.invokeExact((double)n); break;
case CHAR: result = (Character) boxer.invokeExact((char)n); break;
case BYTE: result = (Byte) boxer.invokeExact((byte)n); break;
case SHORT: result = (Short) boxer.invokeExact((short)n); break;
case BOOLEAN: result = (Boolean) boxer.invokeExact((n & 1) != 0); break;
}
assertEquals("(dst,src,n,box)="+Arrays.asList(w,w,n,box),
expResult, result);
}
}
}
@Test
public void testCast() throws Throwable {
Class<?>[] types = { Object.class, Serializable.class, String.class, Number.class, Integer.class };
Object[] objects = { new Object(), Boolean.FALSE, "hello", (Long)12L, (Integer)6 };
for (Class<?> dst : types) {
MethodHandle caster = ValueConversions.cast().bindTo(dst);
assertEquals(caster.type(), MethodHandles.identity(Object.class).type());
for (Object obj : objects) {
Class<?> src = obj.getClass();
boolean canCast = dst.isAssignableFrom(src);
try {
Object result = caster.invokeExact(obj);
if (canCast)
assertEquals(obj, result);
else
assertEquals("cast should not have succeeded", dst, obj);
} catch (ClassCastException ex) {
if (canCast)
throw ex;
}
}
}
}
@Test
public void testConvert() throws Throwable {
for (long tval = 0, ctr = 0;;) {
if (++ctr > 99999) throw new AssertionError("too many test values");
// prints 3776 test patterns (3776 = 8*59*8)
tval = nextTestValue(tval);
if (tval == 0) {
break; // repeat
}
}
for (Wrapper src : Wrapper.values()) {
for (Wrapper dst : Wrapper.values()) {
testConvert(src, dst, 0);
}
}
}
static void testConvert(Wrapper src, Wrapper dst, long tval) throws Throwable {
if (dst == Wrapper.OBJECT || src == Wrapper.OBJECT) return; // must have prims
if (dst == Wrapper.VOID || src == Wrapper.VOID ) return; // must have values
boolean testSingleCase = (tval != 0);
final long tvalInit = tval;
MethodHandle conv = ValueConversions.convertPrimitive(src, dst);
MethodType convType = MethodType.methodType(dst.primitiveType(), src.primitiveType());
assertEquals(convType, conv.type());
MethodHandle converter = conv.asType(conv.type().changeReturnType(Object.class));
for (;;) {
long n = tval;
Object testValue = src.wrap(n);
Object expResult = dst.cast(testValue, dst.primitiveType());
Object result;
switch (src) {
case INT: result = converter.invokeExact((int)n); break;
case LONG: result = converter.invokeExact(/*long*/n); break;
case FLOAT: result = converter.invokeExact((float)n); break;
case DOUBLE: result = converter.invokeExact((double)n); break;
case CHAR: result = converter.invokeExact((char)n); break;
case BYTE: result = converter.invokeExact((byte)n); break;
case SHORT: result = converter.invokeExact((short)n); break;
case BOOLEAN: result = converter.invokeExact((n & 1) != 0); break;
default: throw new AssertionError();
}
assertEquals("(src,dst,n,testValue)="+Arrays.asList(src,dst,"0x"+Long.toHexString(n),testValue),
expResult, result);
if (testSingleCase) break;
// next test value:
tval = nextTestValue(tval);
if (tval == tvalInit) break; // repeat
}
}
static long tweakSign(long x) {
// Assuming that x is mostly zeroes, make those zeroes follow bit #62 (just below the sign).
// This function is self-inverse.
final long MID_SIGN_BIT = 62;
long sign = -((x >>> MID_SIGN_BIT) & 1); // all ones or all zeroes
long flip = (sign >>> -MID_SIGN_BIT); // apply the sign below the mid-bit
return x ^ flip;
}
static long nextTestValue(long x) {
// Produce 64 bits with three component bitfields: [ high:3 | mid:58 | low:3 ].
// The high and low fields vary through all possible bit patterns.
// The middle field is either all zero or has a single bit set.
// For better coverage of the neighborhood of zero, an internal sign bit is xored downward also.
long ux = tweakSign(x); // unsign the middle field
final long LOW_BITS = 3, LOW_BITS_MASK = (1L << LOW_BITS)-1;
final long HIGH_BITS = 3, HIGH_BITS_MASK = ~(-1L >>> HIGH_BITS);
if ((ux & LOW_BITS_MASK) != LOW_BITS_MASK) {
++ux;
} else {
ux &= ~LOW_BITS_MASK;
long midBit = (ux & ~HIGH_BITS_MASK);
if (midBit == 0)
midBit = (1L<<LOW_BITS); // introduce a low bit
ux += midBit;
}
return tweakSign(ux);
}
}
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