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/*
* Copyright (c) 2023, 2024, 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
* @run testng/othervm -Djava.lang.invoke.VarHandle.VAR_HANDLE_GUARDS=true -Djava.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT=false -Xverify:all TestAccessModes
* @run testng/othervm -Djava.lang.invoke.VarHandle.VAR_HANDLE_GUARDS=true -Djava.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT=true -Xverify:all TestAccessModes
* @run testng/othervm -Djava.lang.invoke.VarHandle.VAR_HANDLE_GUARDS=false -Djava.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT=false -Xverify:all TestAccessModes
* @run testng/othervm -Djava.lang.invoke.VarHandle.VAR_HANDLE_GUARDS=false -Djava.lang.invoke.VarHandle.VAR_HANDLE_IDENTITY_ADAPT=true -Xverify:all TestAccessModes
*/
import java.lang.foreign.*;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.lang.invoke.VarHandle;
import java.lang.invoke.VarHandle.AccessMode;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.List;
import java.util.Set;
import org.testng.annotations.*;
import static org.testng.Assert.*;
public class TestAccessModes {
@Test(dataProvider = "segmentsAndLayoutsAndModes")
public void testAccessModes(MemorySegment segment, MemoryLayout layout, AccessMode mode) throws Throwable {
VarHandle varHandle = layout instanceof ValueLayout ?
layout.varHandle() :
layout.varHandle(MemoryLayout.PathElement.groupElement(0));
MethodHandle methodHandle = varHandle.toMethodHandle(mode);
boolean compatible = AccessModeKind.supportedModes(accessLayout(layout)).contains(AccessModeKind.of(mode));
try {
Object o = methodHandle.invokeWithArguments(makeArgs(segment, varHandle.accessModeType(mode)));
assertTrue(compatible);
} catch (UnsupportedOperationException ex) {
assertFalse(compatible);
} catch (IllegalArgumentException ex) {
// access is unaligned
assertTrue(segment.maxByteAlignment() < layout.byteAlignment());
}
}
static ValueLayout accessLayout(MemoryLayout layout) {
return switch (layout) {
case ValueLayout vl -> vl;
case GroupLayout gl -> accessLayout(gl.memberLayouts().get(0));
default -> throw new IllegalStateException();
};
}
Object[] makeArgs(MemorySegment segment, MethodType type) throws Throwable {
List<Object> args = new ArrayList<>();
args.add(segment);
for (Class argType : type.dropParameterTypes(0, 1).parameterList()) {
args.add(defaultValue(argType));
}
return args.toArray();
}
Object defaultValue(Class<?> clazz) throws Throwable {
if (clazz == MemorySegment.class) {
return MemorySegment.NULL;
} else if (clazz.isPrimitive()) {
return MethodHandles.zero(clazz).invoke();
} else {
throw new UnsupportedOperationException();
}
}
/*
* See the javadoc of MemoryLayout::varHandle.
*/
enum AccessModeKind {
PLAIN,
READ_WRITE,
ATOMIC_UPDATE,
ATOMIC_NUMERIC_UPDATE,
ATOMIC_BITWISE_UPDATE;
static AccessModeKind of(AccessMode mode) {
return switch (mode) {
case GET, SET -> PLAIN;
case GET_ACQUIRE, GET_OPAQUE, GET_VOLATILE, SET_VOLATILE,
SET_OPAQUE, SET_RELEASE -> READ_WRITE;
case GET_AND_SET, GET_AND_SET_ACQUIRE, GET_AND_SET_RELEASE,
WEAK_COMPARE_AND_SET, WEAK_COMPARE_AND_SET_RELEASE,
WEAK_COMPARE_AND_SET_ACQUIRE, WEAK_COMPARE_AND_SET_PLAIN,
COMPARE_AND_EXCHANGE, COMPARE_AND_EXCHANGE_ACQUIRE,
COMPARE_AND_EXCHANGE_RELEASE, COMPARE_AND_SET -> ATOMIC_UPDATE;
case GET_AND_ADD, GET_AND_ADD_ACQUIRE, GET_AND_ADD_RELEASE -> ATOMIC_NUMERIC_UPDATE;
default -> ATOMIC_BITWISE_UPDATE;
};
}
static Set<AccessModeKind> supportedModes(ValueLayout layout) {
Set<AccessModeKind> supportedModes = EnumSet.noneOf(AccessModeKind.class);
supportedModes.add(PLAIN);
if (layout.byteAlignment() >= layout.byteSize()) {
supportedModes.add(READ_WRITE);
if (layout instanceof ValueLayout.OfInt || layout instanceof ValueLayout.OfLong ||
layout instanceof ValueLayout.OfFloat || layout instanceof ValueLayout.OfDouble ||
layout instanceof AddressLayout) {
supportedModes.add(ATOMIC_UPDATE);
}
if (layout instanceof ValueLayout.OfInt || layout instanceof ValueLayout.OfLong ||
layout instanceof AddressLayout) {
supportedModes.add(ATOMIC_NUMERIC_UPDATE);
supportedModes.add(ATOMIC_BITWISE_UPDATE);
}
}
return supportedModes;
}
}
static MemoryLayout[] layouts() {
MemoryLayout[] valueLayouts = {
ValueLayout.JAVA_BOOLEAN,
ValueLayout.JAVA_CHAR,
ValueLayout.JAVA_BYTE,
ValueLayout.JAVA_SHORT,
ValueLayout.JAVA_INT,
ValueLayout.JAVA_FLOAT,
ValueLayout.JAVA_LONG,
ValueLayout.JAVA_DOUBLE,
ValueLayout.ADDRESS
};
List<MemoryLayout> layouts = new ArrayList<>();
for (MemoryLayout layout : valueLayouts) {
for (int align : new int[] { 1, 2, 4, 8 }) {
layouts.add(layout.withByteAlignment(align));
layouts.add(MemoryLayout.structLayout(layout.withByteAlignment(align)));
}
}
return layouts.toArray(new MemoryLayout[0]);
}
static MemorySegment[] segments() {
return new MemorySegment[]{
Arena.ofAuto().allocate(8),
MemorySegment.ofArray(new byte[8]),
MemorySegment.ofArray(new char[4]),
MemorySegment.ofArray(new short[4]),
MemorySegment.ofArray(new int[2]),
MemorySegment.ofArray(new float[2]),
MemorySegment.ofArray(new long[1]),
MemorySegment.ofArray(new double[1])
};
}
@DataProvider(name = "segmentsAndLayoutsAndModes")
static Object[][] segmentsAndLayoutsAndModes() {
List<Object[]> segmentsAndLayouts = new ArrayList<>();
for (MemorySegment segment : segments()) {
for (MemoryLayout layout : layouts()) {
for (AccessMode mode : AccessMode.values()) {
segmentsAndLayouts.add(new Object[]{segment, layout, mode});
}
}
}
return segmentsAndLayouts.toArray(new Object[0][]);
}
}
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