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/*
* Copyright (c) 2024, 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
* @summary Test CaptureStateUtil
* @modules java.base/jdk.internal.foreign
* @run junit TestCaptureStateUtil
*/
import jdk.internal.foreign.CaptureStateUtil;
import org.junit.jupiter.api.Test;
import java.lang.foreign.Linker;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.VarHandle;
import static org.junit.jupiter.api.Assertions.*;
final class TestCaptureStateUtil {
private static final String ERRNO_NAME = "errno";
private static final VarHandle ERRNO_HANDLE = Linker.Option.captureStateLayout()
.varHandle(MemoryLayout.PathElement.groupElement(ERRNO_NAME));
private static final MethodHandle INT_DUMMY_HANDLE;
private static final MethodHandle LONG_DUMMY_HANDLE;
static {
try {
MethodHandles.Lookup lookup = MethodHandles.lookup();
INT_DUMMY_HANDLE = lookup
.findStatic(TestCaptureStateUtil.class, "dummy",
MethodType.methodType(int.class, MemorySegment.class, int.class, int.class));
LONG_DUMMY_HANDLE = lookup
.findStatic(TestCaptureStateUtil.class, "dummy",
MethodType.methodType(long.class, MemorySegment.class, long.class, int.class));
} catch (ReflectiveOperationException e) {
throw new InternalError(e);
}
}
private static final MethodHandle ADAPTED_INT = CaptureStateUtil
.adaptSystemCall(INT_DUMMY_HANDLE, ERRNO_NAME);
private static final MethodHandle ADAPTED_LONG = CaptureStateUtil
.adaptSystemCall(LONG_DUMMY_HANDLE, ERRNO_NAME);
@Test
void successfulInt() throws Throwable {
int r = (int) ADAPTED_INT.invokeExact(1, 0);
assertEquals(1, r);
}
private static final int EACCES = 13; /* Permission denied */
@Test
void errorInt() throws Throwable {
int r = (int) ADAPTED_INT.invokeExact(-1, EACCES);
assertEquals(-EACCES, r);
}
@Test
void successfulLong() throws Throwable {
long r = (long) ADAPTED_LONG.invokeExact(1L, 0);
assertEquals(1, r);
}
@Test
void errorLong() throws Throwable {
long r = (long) ADAPTED_LONG.invokeExact(-1L, EACCES);
assertEquals(-EACCES, r);
}
@Test
void successfulIntPerHandle() throws Throwable {
MethodHandle handle = CaptureStateUtil
.adaptSystemCall(INT_DUMMY_HANDLE, ERRNO_NAME);
int r = (int) handle.invokeExact(1, 0);
assertEquals(1, r);
}
@Test
void invariants() throws Throwable {
MethodHandle noSegment = MethodHandles.lookup()
.findStatic(TestCaptureStateUtil.class, "wrongType",
MethodType.methodType(long.class, long.class, int.class));
var noSegEx = assertThrows(IllegalArgumentException.class, () -> CaptureStateUtil.adaptSystemCall(noSegment, ERRNO_NAME));
assertTrue(noSegEx.getMessage().contains("does not have a MemorySegment as the first parameter"));
MethodHandle noArgMH = MethodHandles.empty(MethodType.methodType(int.class));
var emptyEx = assertThrows(IllegalArgumentException.class, () -> CaptureStateUtil.adaptSystemCall(noArgMH, ERRNO_NAME));
assertTrue(emptyEx.getMessage().contains("does not have a MemorySegment as the first parameter"));
MethodHandle wrongReturnType = MethodHandles.lookup()
.findStatic(TestCaptureStateUtil.class, "wrongType",
MethodType.methodType(short.class, MemorySegment.class, long.class, int.class));
var wrongRetEx = assertThrows(IllegalArgumentException.class, () -> CaptureStateUtil.adaptSystemCall(wrongReturnType, ERRNO_NAME));
assertTrue(wrongRetEx.getMessage().contains("does not return an int or a long"));
var wrongCaptureName = assertThrows(IllegalArgumentException.class, () -> CaptureStateUtil.adaptSystemCall(LONG_DUMMY_HANDLE, "foo"));
assertEquals("Input not allowed: SegmentExtractorKey[returnType=long, stateName=foo]", wrongCaptureName.getMessage());
assertThrows(NullPointerException.class, () -> CaptureStateUtil.adaptSystemCall(null, ERRNO_NAME));
assertThrows(IllegalArgumentException.class, () -> CaptureStateUtil.adaptSystemCall(noSegment, null));
}
// Dummy method that is just returning the provided parameters
private static int dummy(MemorySegment segment, int result, int errno) {
ERRNO_HANDLE.set(segment, 0, errno);
return result;
}
// Dummy method that is just returning the provided parameters
private static long dummy(MemorySegment segment, long result, int errno) {
ERRNO_HANDLE.set(segment, 0, errno);
return result;
}
private static long wrongType(long result, int errno) {
return 0;
}
private static short wrongType(MemorySegment segment, long result, int errno) {
return 0;
}
}
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