Quelle ValueConversionsTest.java Sprache: JAVA

/*
* 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 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);
    }
}

quality87%

¤ Dauer der Verarbeitung: 0.14 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.