1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 package jdk.internal.foreign.abi; 26 27 import jdk.incubator.foreign.MemoryAddress; 28 import jdk.incubator.foreign.MemorySegment; 29 import jdk.internal.foreign.ResourceScopeImpl; 30 import jdk.internal.foreign.NativeMemorySegmentImpl; 31 32 public class UpcallStubs { 33 upcallAddress(UpcallHandler handler, ResourceScopeImpl scope)34 public static MemoryAddress upcallAddress(UpcallHandler handler, ResourceScopeImpl scope) { 35 long stubAddress = handler.entryPoint(); 36 return NativeMemorySegmentImpl.makeNativeSegmentUnchecked(MemoryAddress.ofLong(stubAddress), 0, 37 () -> freeUpcallStub(stubAddress), scope).address(); 38 } 39 freeUpcallStub(long stubAddress)40 private static void freeUpcallStub(long stubAddress) { 41 if (!freeUpcallStub0(stubAddress)) { 42 throw new IllegalStateException("Not a stub address: " + stubAddress); 43 } 44 } 45 46 // natives 47 48 // returns true if the stub was found (and freed) freeUpcallStub0(long addr)49 private static native boolean freeUpcallStub0(long addr); 50 registerNatives()51 private static native void registerNatives(); 52 static { registerNatives()53 registerNatives(); 54 } 55 } 56