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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
* @library ../
* @modules java.base/jdk.internal.foreign
* @run junit/othervm --enable-native-access=ALL-UNNAMED TestLargeStub
*/
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import java.lang.foreign.Arena;
import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.Linker;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.ValueLayout;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import java.util.stream.Stream;
import static org.junit.jupiter.params.provider.Arguments.arguments;
public class TestLargeStub extends NativeTestHelper {
private static final int DOWNCALL_AVAILABLE_SLOTS = 248;
private static final int UPCALL_AVAILABLE_SLOTS = 250;
MemoryLayout STRUCT_LL = MemoryLayout.structLayout(
C_LONG_LONG,
C_LONG_LONG
); // 16 byte struct triggers return buffer usage on SysV
@ParameterizedTest
@MethodSource("layouts")
public void testDowncall(ValueLayout layout, int numSlots) {
// Link a handle with a large number of arguments, to try and overflow the code buffer
Linker.nativeLinker().downcallHandle(
FunctionDescriptor.of(STRUCT_LL,
Stream.generate(() -> layout).limit(DOWNCALL_AVAILABLE_SLOTS / numSlots).toArray(MemoryLayout[]::new)),
Linker.Option.captureCallState("errno"));
}
@Test
public void testDowncallAllowHeap() {
// Link a handle with a large number of address arguments, to try and overflow the code buffer
// Using 83 parameters should get us 255 parameter slots in total:
// 83 oops + 166 for offsets + 2 for the target address + 2 for return buffer + MH recv. + NEP
Linker.nativeLinker().downcallHandle(
FunctionDescriptor.of(STRUCT_LL,
Stream.generate(() -> C_POINTER).limit(83).toArray(MemoryLayout[]::new)),
Linker.Option.critical(true));
}
@ParameterizedTest
@MethodSource("layouts")
public void testUpcall(ValueLayout layout, int numSlots) {
// Link a handle with a large number of arguments, to try and overflow the code buffer
try (Arena arena = Arena.ofConfined()) {
Linker.nativeLinker().upcallStub(
MethodHandles.empty(MethodType.methodType(MemorySegment.class,
Stream.generate(() -> layout).limit(UPCALL_AVAILABLE_SLOTS / numSlots)
.map(ValueLayout::carrier)
.toArray(Class<?>[]::new))),
FunctionDescriptor.of(STRUCT_LL,
Stream.generate(() -> layout).limit(UPCALL_AVAILABLE_SLOTS / numSlots)
.toArray(MemoryLayout[]::new)),
arena);
}
}
private static Stream<Arguments> layouts() {
return Stream.of(
arguments(C_INT, 1),
arguments(C_LONG_LONG, 2),
arguments(C_FLOAT, 1),
arguments(C_DOUBLE, 2)
);
}
}
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