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java-topology/test/jdk/java/lang/constant/CondyDescTest.java
russell@unturf.com 0a580b313d undefect. CWE-407 — 63 sites patched across 27 ecosystems 
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.
2026-03-26 17:11:57 -04:00

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/*
* Copyright (c) 2018, 2026, 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.
*/
import java.lang.Enum.EnumDesc;
import java.lang.constant.MethodTypeDesc;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.lang.invoke.VarHandle.VarHandleDesc;
import java.lang.constant.ClassDesc;
import java.lang.constant.ConstantDesc;
import java.lang.constant.ConstantDescs;
import java.lang.constant.DirectMethodHandleDesc;
import java.lang.constant.DynamicConstantDesc;
import java.lang.constant.MethodHandleDesc;
import static java.lang.constant.ConstantDescs.CD_MethodHandle;
import static java.lang.constant.ConstantDescs.CD_Object;
import static java.lang.constant.ConstantDescs.CD_String;
import static java.lang.constant.ConstantDescs.CD_VarHandle;
import static java.lang.constant.ConstantDescs.CD_int;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotSame;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertSame;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.Test;
/*
* @test
* @compile CondyDescTest.java
* @run junit CondyDescTest
* @summary unit tests for java.lang.constant.CondyDescTest
*/
public class CondyDescTest extends SymbolicDescTest {
private final static ConstantDesc[] EMPTY_ARGS = new ConstantDesc[0];
private final static ClassDesc CD_ConstantBootstraps = ClassDesc.of("java.lang.invoke.ConstantBootstraps");
private static<T> void testDCR(DynamicConstantDesc<T> r, T c) throws ReflectiveOperationException {
assertEquals(DynamicConstantDesc.ofNamed(r.bootstrapMethod(), r.constantName(), r.constantType(), r.bootstrapArgs()), r);
assertEquals(c, r.resolveConstantDesc(LOOKUP));
}
private void testVarHandleDesc(DynamicConstantDesc<VarHandle> r, VarHandle vh) throws ReflectiveOperationException {
testSymbolicDesc(r);
assertEquals(r, vh.describeConstable().orElseThrow());
}
private static<E extends Enum<E>> void testEnumDesc(EnumDesc<E> r, E e) throws ReflectiveOperationException {
testSymbolicDesc(r);
assertEquals(EnumDesc.of(r.constantType(), r.constantName()), r);
assertEquals(e, r.resolveConstantDesc(LOOKUP));
}
@Test
public void testNullConstant() throws ReflectiveOperationException {
DynamicConstantDesc<?> r = (DynamicConstantDesc<?>) ConstantDescs.NULL;
assertEquals(DynamicConstantDesc.ofNamed(r.bootstrapMethod(), r.constantName(), r.constantType(), r.bootstrapArgs()), r);
assertNull(r.resolveConstantDesc(LOOKUP));
}
static String concatBSM(MethodHandles.Lookup lookup, String name, Class<?> type, String a, String b) {
return a + b;
}
@Test
public void testDynamicConstant() throws ReflectiveOperationException {
DirectMethodHandleDesc bsmDesc = ConstantDescs.ofConstantBootstrap(ClassDesc.of("CondyDescTest"), "concatBSM",
CD_String, CD_String, CD_String);
DynamicConstantDesc<String> r = DynamicConstantDesc.of(bsmDesc, "foo", "bar");
testDCR(r, "foobar");
}
@Test
public void testNested() throws Throwable {
DirectMethodHandleDesc invoker = ConstantDescs.ofConstantBootstrap(CD_ConstantBootstraps, "invoke", CD_Object, CD_MethodHandle, CD_Object.arrayType());
DirectMethodHandleDesc format = MethodHandleDesc.ofMethod(DirectMethodHandleDesc.Kind.STATIC, CD_String, "format",
MethodTypeDesc.of(CD_String, CD_String, CD_Object.arrayType()));
String s = (String) invoker.resolveConstantDesc(LOOKUP)
.invoke(LOOKUP, "", String.class,
format.resolveConstantDesc(LOOKUP), "%s%s", "moo", "cow");
assertEquals("moocow", s);
DynamicConstantDesc<String> desc = DynamicConstantDesc.of(invoker, format, "%s%s", "moo", "cow");
testDCR(desc, "moocow");
DynamicConstantDesc<String> desc2 = DynamicConstantDesc.of(invoker, format, "%s%s", desc, "cow");
testDCR(desc2, "moocowcow");
}
enum MyEnum { A, B, C }
@Test
public void testEnumDesc() throws ReflectiveOperationException {
ClassDesc enumClass = ClassDesc.of("CondyDescTest").nested("MyEnum");
testEnumDesc(EnumDesc.of(enumClass, "A"), MyEnum.A);
testEnumDesc(EnumDesc.of(enumClass, "B"), MyEnum.B);
testEnumDesc(EnumDesc.of(enumClass, "C"), MyEnum.C);
DynamicConstantDesc<MyEnum> denum = DynamicConstantDesc.ofNamed(ConstantDescs.BSM_ENUM_CONSTANT, "A", enumClass, EMPTY_ARGS);
assertEquals(MyEnum.A, denum.resolveConstantDesc(LOOKUP));
EnumDesc<MyEnum> enumDesc = (EnumDesc<MyEnum>)DynamicConstantDesc.<MyEnum>ofCanonical(ConstantDescs.BSM_ENUM_CONSTANT, "A", enumClass, EMPTY_ARGS);
assertEquals(MyEnum.A, enumDesc.resolveConstantDesc(LOOKUP));
}
static class MyClass {
static int sf;
int f;
}
@Test
public void testVarHandles() throws ReflectiveOperationException {
ClassDesc testClass = ClassDesc.of("CondyDescTest").nested("MyClass");
MyClass instance = new MyClass();
// static varHandle
VarHandleDesc vhc = VarHandleDesc.ofStaticField(testClass, "sf", CD_int);
VarHandle varHandle = LOOKUP.findStaticVarHandle(MyClass.class, "sf", int.class);
testVarHandleDesc(vhc, varHandle);
assertEquals(int.class, varHandle.varType());
varHandle.set(8);
assertEquals(8, (int) varHandle.get());
assertEquals(8, MyClass.sf);
// static varHandle
vhc = VarHandleDesc.ofField(testClass, "f", CD_int);
varHandle = LOOKUP.findVarHandle(MyClass.class, "f", int.class);
testVarHandleDesc(vhc, varHandle);
assertEquals(int.class, varHandle.varType());
varHandle.set(instance, 9);
assertEquals(9, (int) varHandle.get(instance));
assertEquals(9, instance.f);
vhc = VarHandleDesc.ofArray(CD_int.arrayType());
varHandle = MethodHandles.arrayElementVarHandle(int[].class);
testVarHandleDesc(vhc, varHandle);
int[] ints = new int[3];
varHandle.set(ints, 0, 1);
varHandle.set(ints, 1, 2);
varHandle.set(ints, 2, 3);
assertEquals(1, varHandle.get(ints, 0));
assertEquals(2, varHandle.get(ints, 1));
assertEquals(3, varHandle.get(ints, 2));
assertEquals(1, ints[0]);
assertEquals(2, ints[1]);
assertEquals(3, ints[2]);
// static var handle obtained using the DynamicConstantDesc
DynamicConstantDesc<VarHandle> dcd = DynamicConstantDesc.ofNamed(ConstantDescs.BSM_VARHANDLE_STATIC_FIELD, "sf", CD_VarHandle, new ConstantDesc[] {testClass, CD_int });
VarHandle vh = dcd.resolveConstantDesc(LOOKUP);
testVarHandleDesc(dcd, vh);
VarHandleDesc vhd = (VarHandleDesc) DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_VARHANDLE_STATIC_FIELD, "sf", CD_VarHandle, new ConstantDesc[] {testClass, CD_int });
vh = vhd.resolveConstantDesc(LOOKUP);
testVarHandleDesc(vhd, vh);
dcd = DynamicConstantDesc.ofNamed(ConstantDescs.BSM_VARHANDLE_FIELD, "f", CD_VarHandle, new ConstantDesc[] {testClass, CD_int });
vh = dcd.resolveConstantDesc(LOOKUP);
testVarHandleDesc(dcd, vh);
vhd = (VarHandleDesc) DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_VARHANDLE_FIELD, "f", CD_VarHandle, new ConstantDesc[] {testClass, CD_int });
vh = vhd.resolveConstantDesc(LOOKUP);
testVarHandleDesc(vhd, vh);
dcd = DynamicConstantDesc.ofNamed(ConstantDescs.BSM_VARHANDLE_ARRAY, "_", CD_VarHandle, new ConstantDesc[] {CD_int.arrayType() });
vh = dcd.resolveConstantDesc(LOOKUP);
testVarHandleDesc(dcd, vh);
vhd = (VarHandleDesc)DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_VARHANDLE_ARRAY, "_", CD_VarHandle, new ConstantDesc[] {CD_int.arrayType() });
vh = vhd.resolveConstantDesc(LOOKUP);
testVarHandleDesc(vhd, vh);
}
private<T> void assertLifted(ConstantDesc prototype,
DynamicConstantDesc<T> nonCanonical,
ConstantDesc canonical) {
Class<?> clazz = prototype.getClass();
assertNotSame(canonical, nonCanonical);
assertTrue(clazz.isAssignableFrom(canonical.getClass()));
assertFalse(clazz.isAssignableFrom(nonCanonical.getClass()));
assertEquals(prototype, canonical);
assertEquals(canonical, prototype);
if (prototype instanceof DynamicConstantDesc) {
assertEquals(canonical, nonCanonical);
assertEquals(nonCanonical, canonical);
assertEquals(prototype, nonCanonical);
assertEquals(nonCanonical, prototype);
}
}
@Test
public void testLifting() {
DynamicConstantDesc<Object> unliftedNull = DynamicConstantDesc.ofNamed(ConstantDescs.BSM_NULL_CONSTANT, "_", CD_Object, EMPTY_ARGS);
assertEquals(ConstantDescs.NULL, unliftedNull);
assertNotSame(ConstantDescs.NULL, unliftedNull);
assertSame(ConstantDescs.NULL, DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_NULL_CONSTANT, "_", CD_Object, EMPTY_ARGS));
assertSame(ConstantDescs.NULL, DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_NULL_CONSTANT, "_", CD_String, EMPTY_ARGS));
assertSame(ConstantDescs.NULL, DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_NULL_CONSTANT, "wahoo", CD_Object, EMPTY_ARGS));
assertLifted(CD_int,
DynamicConstantDesc.ofNamed(ConstantDescs.BSM_PRIMITIVE_CLASS, "I", ConstantDescs.CD_Class, EMPTY_ARGS),
DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_PRIMITIVE_CLASS, "I", ConstantDescs.CD_Class, EMPTY_ARGS));
ClassDesc enumClass = ClassDesc.of("CondyDescTest").nested("MyEnum");
assertLifted(EnumDesc.of(enumClass, "A"),
DynamicConstantDesc.ofNamed(ConstantDescs.BSM_ENUM_CONSTANT, "A", enumClass, EMPTY_ARGS),
DynamicConstantDesc.<MyEnum>ofCanonical(ConstantDescs.BSM_ENUM_CONSTANT, "A", enumClass, EMPTY_ARGS));
ClassDesc testClass = ClassDesc.of("CondyDescTest").nested("MyClass");
assertLifted(VarHandleDesc.ofStaticField(testClass, "sf", CD_int),
DynamicConstantDesc.ofNamed(ConstantDescs.BSM_VARHANDLE_STATIC_FIELD, "sf", CD_VarHandle, new ConstantDesc[] {testClass, CD_int }),
DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_VARHANDLE_STATIC_FIELD, "sf", CD_VarHandle, new ConstantDesc[] {testClass, CD_int }));
assertLifted(VarHandleDesc.ofField(testClass, "f", CD_int),
DynamicConstantDesc.ofNamed(ConstantDescs.BSM_VARHANDLE_FIELD, "f", CD_VarHandle, new ConstantDesc[] {testClass, CD_int }),
DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_VARHANDLE_FIELD, "f", CD_VarHandle, new ConstantDesc[] {testClass, CD_int }));
assertLifted(VarHandleDesc.ofArray(CD_int.arrayType()),
DynamicConstantDesc.ofNamed(ConstantDescs.BSM_VARHANDLE_ARRAY, "_", CD_VarHandle, new ConstantDesc[] {CD_int.arrayType() }),
DynamicConstantDesc.ofCanonical(ConstantDescs.BSM_VARHANDLE_ARRAY, "_", CD_VarHandle, new ConstantDesc[] {CD_int.arrayType() }));
}
}
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