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/*
* Copyright (c) 2023, 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
* @enablePreview
* @run testng TestDereferencePath
*/
import java.lang.foreign.Arena;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemoryLayout.PathElement;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.ValueLayout;
import org.testng.annotations.*;
import java.lang.invoke.VarHandle;
import static org.testng.Assert.*;
public class TestDereferencePath {
static final MemoryLayout C = MemoryLayout.structLayout(
ValueLayout.JAVA_INT.withName("x")
);
static final MemoryLayout B = MemoryLayout.structLayout(
ValueLayout.ADDRESS.withName("c")
.withTargetLayout(C)
);
static final MemoryLayout A = MemoryLayout.structLayout(
ValueLayout.ADDRESS.withName("b")
.withTargetLayout(B)
);
static final VarHandle abcx = A.varHandle(
PathElement.groupElement("b"), PathElement.dereferenceElement(),
PathElement.groupElement("c"), PathElement.dereferenceElement(),
PathElement.groupElement("x"));
@Test
public void testSingle() {
try (Arena arena = Arena.ofConfined()) {
// init structs
MemorySegment a = arena.allocate(A);
MemorySegment b = arena.allocate(B);
MemorySegment c = arena.allocate(C);
// init struct fields
a.set(ValueLayout.ADDRESS, 0, b);
b.set(ValueLayout.ADDRESS, 0, c);
c.set(ValueLayout.JAVA_INT, 0, 42);
// dereference
int val = (int) abcx.get(a);
assertEquals(val, 42);
}
}
static final MemoryLayout B_MULTI = MemoryLayout.structLayout(
ValueLayout.ADDRESS.withName("cs")
.withTargetLayout(MemoryLayout.sequenceLayout(2, C))
);
static final MemoryLayout A_MULTI = MemoryLayout.structLayout(
ValueLayout.ADDRESS.withName("bs")
.withTargetLayout(MemoryLayout.sequenceLayout(2, B_MULTI))
);
static final VarHandle abcx_multi = A_MULTI.varHandle(
PathElement.groupElement("bs"), PathElement.dereferenceElement(), PathElement.sequenceElement(),
PathElement.groupElement("cs"), PathElement.dereferenceElement(), PathElement.sequenceElement(),
PathElement.groupElement("x"));
@Test
public void testMulti() {
try (Arena arena = Arena.ofConfined()) {
// init structs
MemorySegment a = arena.allocate(A);
MemorySegment b = arena.allocateArray(B, 2);
MemorySegment c = arena.allocateArray(C, 4);
// init struct fields
a.set(ValueLayout.ADDRESS, 0, b);
b.set(ValueLayout.ADDRESS, 0, c);
b.setAtIndex(ValueLayout.ADDRESS, 1, c.asSlice(C.byteSize() * 2));
c.setAtIndex(ValueLayout.JAVA_INT, 0, 1);
c.setAtIndex(ValueLayout.JAVA_INT, 1, 2);
c.setAtIndex(ValueLayout.JAVA_INT, 2, 3);
c.setAtIndex(ValueLayout.JAVA_INT, 3, 4);
// dereference
int val00 = (int) abcx_multi.get(a, 0, 0); // a->b[0]->c[0] = 1
assertEquals(val00, 1);
int val10 = (int) abcx_multi.get(a, 1, 0); // a->b[1]->c[0] = 3
assertEquals(val10, 3);
int val01 = (int) abcx_multi.get(a, 0, 1); // a->b[0]->c[1] = 2
assertEquals(val01, 2);
int val11 = (int) abcx_multi.get(a, 1, 1); // a->b[1]->c[1] = 4
assertEquals(val11, 4);
}
}
@Test(expectedExceptions = IllegalArgumentException.class)
void testBadDerefInSelect() {
A.select(PathElement.groupElement("b"), PathElement.dereferenceElement());
}
@Test(expectedExceptions = IllegalArgumentException.class)
void testBadDerefInOffset() {
A.byteOffset(PathElement.groupElement("b"), PathElement.dereferenceElement());
}
@Test(expectedExceptions = IllegalArgumentException.class)
void testBadDerefInSlice() {
A.sliceHandle(PathElement.groupElement("b"), PathElement.dereferenceElement());
}
static final MemoryLayout A_MULTI_NO_TARGET = MemoryLayout.structLayout(
ValueLayout.ADDRESS.withName("bs")
);
@Test(expectedExceptions = IllegalArgumentException.class)
void badDerefAddressNoTarget() {
A_MULTI_NO_TARGET.varHandle(PathElement.groupElement("bs"), PathElement.dereferenceElement());
}
@Test(expectedExceptions = IllegalArgumentException.class)
void badDerefMisAligned() {
MemoryLayout struct = MemoryLayout.structLayout(
ValueLayout.ADDRESS.withTargetLayout(ValueLayout.JAVA_INT).withName("x"));
try (Arena arena = Arena.ofConfined()) {
MemorySegment segment = arena.allocate(struct.byteSize() + 1).asSlice(1);
VarHandle vhX = struct.varHandle(PathElement.groupElement("x"), PathElement.dereferenceElement());
vhX.set(segment, 42); // should throw
}
}
}
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