src/java.base/share/classes/jdk/internal/foreign/abi/UpcallStubs.java - master - niceSOFT/openjdk21

src/java.base/share/classes/jdk/internal/foreign/abi/UpcallStubs.java

62 строки2 KB

Per Minborg

8304265: Implementation of Foreign Function and Memory API (Third Preview)

27 апр 2023, 12:00

27 апр 2023, 12:00cbccc4c

/*
 * Copyright (c) 2020, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 */
package jdk.internal.foreign.abi;

import java.lang.foreign.MemorySegment;
import java.lang.foreign.Arena;

import jdk.internal.foreign.MemorySessionImpl;

public final class UpcallStubs {

    private UpcallStubs() {
    }

    private static void freeUpcallStub(long stubAddress) {
        if (!freeUpcallStub0(stubAddress)) {
            throw new IllegalStateException("Not a stub address: " + stubAddress);
        }
    }

    // natives

    // returns true if the stub was found (and freed)
    private static native boolean freeUpcallStub0(long addr);

    private static native void registerNatives();
    static {
        registerNatives();
    }

    static MemorySegment makeUpcall(long entry, Arena arena) {
        MemorySessionImpl.toMemorySession(arena).addOrCleanupIfFail(new MemorySessionImpl.ResourceList.ResourceCleanup() {
            @Override
            public void cleanup() {
                freeUpcallStub(entry);
            }
        });
        return MemorySegment.ofAddress(entry).reinterpret(arena, null);
    }
}