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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
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test/jdk/java/lang/invoke/VarHandles/VarHandleTestExact.java Normal file
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/*
* Copyright (c) 2020, 2025, 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.
*/
/*
* @test
* @modules java.base/jdk.internal.access.foreign
* @modules java.base/jdk.internal.foreign.layout
*
* @run junit/othervm -Xverify:all
* -Djdk.internal.foreign.SHOULD_ADAPT_HANDLES=false
* VarHandleTestExact
* @run junit/othervm -Xverify:all
* -Djdk.internal.foreign.SHOULD_ADAPT_HANDLES=false
* -Djava.lang.invoke.VarHandle.VAR_HANDLE_GUARDS=true
* -Djava.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT=true
* VarHandleTestExact
* @run junit/othervm -Xverify:all
* -Djdk.internal.foreign.SHOULD_ADAPT_HANDLES=false
* -Djava.lang.invoke.VarHandle.VAR_HANDLE_GUARDS=false
* -Djava.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT=false
* VarHandleTestExact
* @run junit/othervm -Xverify:all
* -Djdk.internal.foreign.SHOULD_ADAPT_HANDLES=false
* -Djava.lang.invoke.VarHandle.VAR_HANDLE_GUARDS=false
* -Djava.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT=true
* VarHandleTestExact
*/
import java.lang.foreign.Arena;
import java.lang.foreign.MemorySegment;
import jdk.internal.foreign.layout.ValueLayouts;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.lang.invoke.WrongMethodTypeException;
import java.lang.reflect.Array;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Assumptions;
import org.junit.jupiter.api.TestInstance;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.MethodSource;
@TestInstance(TestInstance.Lifecycle.PER_CLASS)
public class VarHandleTestExact {
private static class Widget {
static Object objectField_SRW;
static long longField_SRW;
static double doubleField_SRW;
static Long aLongField_SRW;
Object objectField_RW;
long longField_RW;
double doubleField_RW;
Long aLongField_RW;
final static Object objectField_SRO = new Object();
final static long longField_SRO = 1234L;
final static double doubleField_SRO = 1234D;
final static Long aLongField_SRO = 1234L;
final Object objectField_RO = new Object();
final long longField_RO = 1234L;
final double doubleField_RO = 1234D;
final Long aLongField_RO = 1234L;
}
@ParameterizedTest
@MethodSource("dataObjectAccess")
public void testExactSet(String fieldBaseName, Class<?> fieldType, boolean ro, Object testValue,
SetX setter, GetX getter,
SetStaticX staticSetter, GetStaticX staticGetter)
throws NoSuchFieldException, IllegalAccessException {
Assumptions.assumeFalse(ro, "Can not test setter with read only field");
VarHandle vh = MethodHandles.lookup().findVarHandle(Widget.class, fieldBaseName + "_RW", fieldType);
Widget w = new Widget();
doTest(vh,
tvh -> tvh.set(w, testValue),
tvh -> setter.set(tvh, w, testValue),
".*\\Qhandle's method type (Widget," + fieldType.getSimpleName() + ")void \\E.*");
}
@ParameterizedTest
@MethodSource("dataObjectAccess")
public void testExactGet(String fieldBaseName, Class<?> fieldType, boolean ro, Object testValue,
SetX setter, GetX getter,
SetStaticX staticSetter, GetStaticX staticGetter)
throws NoSuchFieldException, IllegalAccessException {
VarHandle vh = MethodHandles.lookup().findVarHandle(Widget.class, fieldBaseName + (ro ? "_RO" : "_RW"), fieldType);
Widget w = new Widget();
doTest(vh,
tvh -> tvh.get(w),
tvh -> getter.get(tvh, w),
".*\\Qhandle's method type (Widget)" + fieldType.getSimpleName() + " \\E.*");
}
@ParameterizedTest
@MethodSource("dataObjectAccess")
public void testExactSetStatic(String fieldBaseName, Class<?> fieldType, boolean ro, Object testValue,
SetX setter, GetX getter,
SetStaticX staticSetter, GetStaticX staticGetter)
throws NoSuchFieldException, IllegalAccessException {
Assumptions.assumeFalse(ro, "Can not test setter with read only field");
VarHandle vh = MethodHandles.lookup().findStaticVarHandle(Widget.class, fieldBaseName + "_SRW", fieldType);
doTest(vh,
tvh -> tvh.set(testValue),
tvh -> staticSetter.set(tvh, testValue),
".*\\Qhandle's method type (" + fieldType.getSimpleName() + ")void \\E.*");
}
@ParameterizedTest
@MethodSource("dataObjectAccess")
public void testExactGetStatic(String fieldBaseName, Class<?> fieldType, boolean ro, Object testValue,
SetX setter, GetX getter,
SetStaticX staticSetter, GetStaticX staticGetter)
throws NoSuchFieldException, IllegalAccessException {
VarHandle vh = MethodHandles.lookup().findStaticVarHandle(Widget.class, fieldBaseName + (ro ? "_SRO" : "_SRW"), fieldType);
doTest(vh,
tvh -> tvh.get(),
tvh -> staticGetter.get(tvh),
".*\\Qhandle's method type ()" + fieldType.getSimpleName() + " \\E.*");
}
@ParameterizedTest
@MethodSource("dataSetArray")
public void testExactArraySet(Class<?> arrayClass, Object testValue, SetArrayX setter) {
VarHandle vh = MethodHandles.arrayElementVarHandle(arrayClass);
Object arr = Array.newInstance(arrayClass.componentType(), 1);
doTest(vh,
tvh -> tvh.set(arr, 0, testValue),
tvh -> setter.set(tvh, arr, testValue),
".*\\Qhandle's method type (" + arrayClass.getSimpleName() + ",int," + arrayClass.componentType().getSimpleName() + ")void \\E.*");
}
@ParameterizedTest
@MethodSource("dataSetBuffer")
public void testExactBufferSet(Class<?> arrayClass, Object testValue, SetBufferX setter) {
VarHandle vh = MethodHandles.byteBufferViewVarHandle(arrayClass, ByteOrder.nativeOrder());
ByteBuffer buff = ByteBuffer.allocateDirect(8);
doTest(vh,
tvh -> tvh.set(buff, 0, testValue),
tvh -> setter.set(tvh, buff, testValue),
".*\\Qhandle's method type (ByteBuffer,int," + arrayClass.componentType().getSimpleName() + ")void \\E.*");
}
@ParameterizedTest
@MethodSource("dataSetMemorySegment")
public void testExactSegmentSet(Class<?> carrier, Object testValue, SetSegmentX setter) {
VarHandle vh = ValueLayouts.valueLayout(carrier, ByteOrder.nativeOrder()).varHandle();
try (Arena arena = Arena.ofConfined()) {
MemorySegment seg = arena.allocate(8);
doTest(vh,
tvh -> tvh.set(seg, 0L, testValue),
tvh -> setter.set(tvh, seg, 0L, testValue),
".*\\Qhandle's method type (MemorySegment,long," + carrier.getSimpleName() + ")void \\E.*");
}
}
private static void doTest(VarHandle invokeHandle, Consumer<VarHandle> invokeTest,
Consumer<VarHandle> invokeExactTest, String expectedMessage) {
assertFalse(invokeHandle.hasInvokeExactBehavior());
assertSame(invokeHandle, invokeHandle.withInvokeBehavior());
try {
invokeTest.accept(invokeHandle);
} catch (WrongMethodTypeException wmte) {
fail("Unexpected exception", wmte);
}
VarHandle invokeExactHandle = invokeHandle.withInvokeExactBehavior();
assertTrue(invokeExactHandle.hasInvokeExactBehavior());
assertSame(invokeExactHandle, invokeExactHandle.withInvokeExactBehavior());
try {
invokeExactTest.accept(invokeExactHandle); // should throw
fail("Exception expected");
} catch (WrongMethodTypeException wmte) {
assertMatches(wmte.getMessage(), expectedMessage);
}
// try going back
VarHandle invokeHandle2 = invokeExactHandle.withInvokeBehavior();
assertFalse(invokeHandle2.hasInvokeExactBehavior());
try {
invokeTest.accept(invokeHandle2);
} catch (WrongMethodTypeException wmte) {
fail("Unexpected exception", wmte);
}
}
private static void assertMatches(String str, String pattern) {
if (!str.matches(pattern)) {
throw new AssertionError("'" + str + "' did not match the pattern '" + pattern + "'.");
}
}
private interface SetX {
void set(VarHandle vh, Widget w, Object testValue);
}
private interface SetStaticX {
void set(VarHandle vh, Object testValue);
}
private interface GetX {
void get(VarHandle vh, Widget w);
}
private interface GetStaticX {
void get(VarHandle vh);
}
private interface SetArrayX {
void set(VarHandle vh, Object array, Object testValue);
}
private interface SetBufferX {
void set(VarHandle vh, ByteBuffer buff, Object testValue);
}
private interface SetSegmentX {
void set(VarHandle vh, MemorySegment segment, long offset, Object testValue);
}
private static void consume(Object o) {}
private static void testCaseObjectAccess(List<Object[]> cases, String fieldBaseName, Class<?> fieldType, Object testValue,
SetX setter, GetX getter,
SetStaticX staticSetter, GetStaticX staticGetter) {
cases.add(new Object[] { fieldBaseName, fieldType, false, testValue, setter, getter, staticSetter, staticGetter });
cases.add(new Object[] { fieldBaseName, fieldType, true, testValue, setter, getter, staticSetter, staticGetter });
}
private static void testCaseArraySet(List<Object[]> cases, Class<?> arrayType, Object testValue, SetArrayX setter) {
cases.add(new Object[] { arrayType, testValue, setter });
}
private static void testCaseBufferSet(List<Object[]> cases, Class<?> arrayType, Object testValue, SetBufferX setter) {
cases.add(new Object[] { arrayType, testValue, setter });
}
private static void testCaseSegmentSet(List<Object[]> cases, Class<?> carrier, Object testValue, SetSegmentX setter) {
cases.add(new Object[] { carrier, testValue, setter });
}
public static Object[][] dataObjectAccess() {
List<Object[]> cases = new ArrayList<>();
// create a bunch of different sig-poly call sites
testCaseObjectAccess(cases, "objectField", Object.class, "abcd",
(vh, w, tv) -> vh.set(w, (String) tv),
(vh, w) -> consume((String) vh.get(w)),
(vh, tv) -> vh.set((String) tv),
(vh) -> consume((String) vh.get()));
testCaseObjectAccess(cases, "objectField", Object.class, Integer.valueOf(1234),
(vh, w, tv) -> vh.set(w, (Integer) tv),
(vh, w) -> consume((Integer) vh.get(w)),
(vh, tv) -> vh.set((Integer) tv),
(vh) -> consume((Integer) vh.get()));
testCaseObjectAccess(cases, "longField", long.class, 1234,
(vh, w, tv) -> vh.set(w, (int) tv),
(vh, w) -> consume((int) vh.get(w)),
(vh, tv) -> vh.set((int) tv),
(vh) -> consume((int) vh.get()));
testCaseObjectAccess(cases, "longField", long.class, (short) 1234,
(vh, w, tv) -> vh.set(w, (short) tv),
(vh, w) -> consume((short) vh.get(w)),
(vh, tv) -> vh.set((short) tv),
(vh) -> consume((short) vh.get()));
testCaseObjectAccess(cases, "longField", long.class, (char) 1234,
(vh, w, tv) -> vh.set(w, (char) tv),
(vh, w) -> consume((char) vh.get(w)),
(vh, tv) -> vh.set((char) tv),
(vh) -> consume((char) vh.get()));
testCaseObjectAccess(cases, "longField", long.class, (byte) 1234,
(vh, w, tv) -> vh.set(w, (byte) tv),
(vh, w) -> consume((byte) vh.get(w)),
(vh, tv) -> vh.set((byte) tv),
(vh) -> consume((byte) vh.get()));
testCaseObjectAccess(cases, "longField", long.class, Long.valueOf(1234L),
(vh, w, tv) -> vh.set(w, (Long) tv),
(vh, w) -> consume((Long) vh.get(w)),
(vh, tv) -> vh.set((Long) tv),
(vh) -> consume((Long) vh.get()));
testCaseObjectAccess(cases, "doubleField", double.class, 1234F,
(vh, w, tv) -> vh.set(w, (float) tv),
(vh, w) -> consume((float) vh.get(w)),
(vh, tv) -> vh.set((float) tv),
(vh) -> consume((float) vh.get()));
testCaseObjectAccess(cases, "doubleField", double.class, 1234,
(vh, w, tv) -> vh.set(w, (int) tv),
(vh, w) -> consume((int) vh.get(w)),
(vh, tv) -> vh.set((int) tv),
(vh) -> consume((int) vh.get()));
testCaseObjectAccess(cases, "doubleField", double.class, 1234L,
(vh, w, tv) -> vh.set(w, (long) tv),
(vh, w) -> consume((long) vh.get(w)),
(vh, tv) -> vh.set((long) tv),
(vh) -> consume((long) vh.get()));
testCaseObjectAccess(cases, "doubleField", double.class, Double.valueOf(1234D),
(vh, w, tv) -> vh.set(w, (Double) tv),
(vh, w) -> consume((Double) vh.get(w)),
(vh, tv) -> vh.set((Double) tv),
(vh) -> consume((Double) vh.get()));
testCaseObjectAccess(cases, "aLongField", Long.class, 1234L,
(vh, w, tv) -> vh.set(w, (long) tv),
(vh, w) -> consume((long) vh.get(w)),
(vh, tv) -> vh.set((long) tv),
(vh) -> consume((long) vh.get()));
return cases.toArray(Object[][]::new);
}
public static Object[][] dataSetArray() {
List<Object[]> cases = new ArrayList<>();
// create a bunch of different sig-poly call sites
testCaseArraySet(cases, Object[].class, "abcd", (vh, arr, tv) -> vh.set((Object[]) arr, 0, (String) tv));
testCaseArraySet(cases, Object[].class, Integer.valueOf(1234), (vh, arr, tv) -> vh.set((Object[]) arr, (Integer) tv));
testCaseArraySet(cases, long[].class, 1234, (vh, arr, tv) -> vh.set((long[]) arr, 0, (int) tv));
testCaseArraySet(cases, long[].class, (short) 1234, (vh, arr, tv) -> vh.set((long[]) arr, 0, (short) tv));
testCaseArraySet(cases, long[].class, (char) 1234, (vh, arr, tv) -> vh.set((long[]) arr, 0, (char) tv));
testCaseArraySet(cases, long[].class, (byte) 1234, (vh, arr, tv) -> vh.set((long[]) arr, 0, (byte) tv));
testCaseArraySet(cases, long[].class, Long.valueOf(1234L), (vh, arr, tv) -> vh.set((long[]) arr, 0, (Long) tv));
testCaseArraySet(cases, double[].class, 1234F, (vh, arr, tv) -> vh.set((double[]) arr, 0, (float) tv));
testCaseArraySet(cases, double[].class, 1234, (vh, arr, tv) -> vh.set((double[]) arr, 0, (int) tv));
testCaseArraySet(cases, double[].class, 1234L, (vh, arr, tv) -> vh.set((double[]) arr, 0, (long) tv));
testCaseArraySet(cases, double[].class, Double.valueOf(1234D), (vh, arr, tv) -> vh.set((double[]) arr, 0, (Double) tv));
testCaseArraySet(cases, Long[].class, 1234L, (vh, arr, tv) -> vh.set((Long[]) arr, 0, (long) tv));
return cases.toArray(Object[][]::new);
}
public static Object[][] dataSetBuffer() {
List<Object[]> cases = new ArrayList<>();
// create a bunch of different sig-poly call sites
testCaseBufferSet(cases, long[].class, 1234, (vh, buff, tv) -> vh.set(buff, 0, (int) tv));
testCaseBufferSet(cases, long[].class, (short) 1234, (vh, buff, tv) -> vh.set(buff, 0, (short) tv));
testCaseBufferSet(cases, long[].class, (char) 1234, (vh, buff, tv) -> vh.set(buff, 0, (char) tv));
testCaseBufferSet(cases, long[].class, (byte) 1234, (vh, buff, tv) -> vh.set(buff, 0, (byte) tv));
testCaseBufferSet(cases, long[].class, Long.valueOf(1234L), (vh, buff, tv) -> vh.set(buff, 0, (Long) tv));
testCaseBufferSet(cases, double[].class, 1234F, (vh, buff, tv) -> vh.set(buff, 0, (float) tv));
testCaseBufferSet(cases, double[].class, 1234, (vh, buff, tv) -> vh.set(buff, 0, (int) tv));
testCaseBufferSet(cases, double[].class, 1234L, (vh, buff, tv) -> vh.set(buff, 0, (long) tv));
testCaseBufferSet(cases, double[].class, Double.valueOf(1234D), (vh, buff, tv) -> vh.set(buff, 0, (Double) tv));
return cases.toArray(Object[][]::new);
}
public static Object[][] dataSetMemorySegment() {
List<Object[]> cases = new ArrayList<>();
// create a bunch of different sig-poly call sites
testCaseSegmentSet(cases, long.class, 1234, (vh, seg, off, tv) -> vh.set((MemorySegment) seg, off, (int) tv));
testCaseSegmentSet(cases, long.class, (char) 1234, (vh, seg, off, tv) -> vh.set((MemorySegment) seg, off, (char) tv));
testCaseSegmentSet(cases, long.class, (short) 1234, (vh, seg, off, tv) -> vh.set((MemorySegment) seg, off, (short) tv));
testCaseSegmentSet(cases, long.class, (byte) 1234, (vh, seg, off, tv) -> vh.set((MemorySegment) seg, off, (byte) tv));
testCaseSegmentSet(cases, double.class, 1234F, (vh, seg, off, tv) -> vh.set((MemorySegment) seg, off, (float) tv));
return cases.toArray(Object[][]::new);
}
}