1 /*
 2  *  Copyright (c) 2021, 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
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25  */
26 package jdk.internal.foreign;
27 
28 import jdk.incubator.foreign.Addressable;
29 import jdk.incubator.foreign.CLinker;
30 import jdk.incubator.foreign.FunctionDescriptor;
31 import jdk.incubator.foreign.MemorySegment;
32 import jdk.incubator.foreign.SegmentAllocator;
33 import jdk.internal.foreign.abi.SharedUtils;
34 
35 import java.lang.invoke.MethodHandle;
36 import java.lang.invoke.MethodHandles;
37 import java.lang.invoke.MethodType;
38 import java.util.Objects;
39 
40 public abstract non-sealed class AbstractCLinker implements CLinker {
41 
42     public final MethodHandle downcallHandle(Addressable symbol, MethodType type, FunctionDescriptor function) {
43         SharedUtils.checkSymbol(symbol);
44         return MethodHandles.insertArguments(downcallHandle(type, function), 0, symbol);
45     }
46 
47     public final MethodHandle downcallHandle(Addressable symbol, SegmentAllocator allocator, MethodType type, FunctionDescriptor function) {
48         SharedUtils.checkSymbol(symbol);
49         Objects.requireNonNull(allocator);
50         MethodHandle downcall = MethodHandles.insertArguments(downcallHandle(type, function), 0, symbol);
51         if (type.returnType().equals(MemorySegment.class)) {
52             downcall = MethodHandles.insertArguments(downcall, 0, allocator);
53         }
54         return downcall;
55     }
56 }