1 /*
 2  * Copyright (c) 2020, 2023, 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.x64.sysv;
26 
27 
28 import jdk.internal.foreign.abi.AbstractLinker;
29 import jdk.internal.foreign.abi.LinkerOptions;
30 import jdk.internal.foreign.abi.SharedUtils;
31 
32 import java.lang.foreign.FunctionDescriptor;
33 import java.lang.foreign.MemoryLayout;
34 import java.lang.foreign.ValueLayout;
35 import java.lang.invoke.MethodHandle;
36 import java.lang.invoke.MethodType;
37 import java.nio.ByteOrder;
38 import java.util.Map;
39 
40 /**
41  * ABI implementation based on System V ABI AMD64 supplement v.0.99.6
42  */
43 public final class SysVx64Linker extends AbstractLinker {
44 
45     static final Map<String, MemoryLayout> CANONICAL_LAYOUTS =
46             SharedUtils.canonicalLayouts(ValueLayout.JAVA_LONG, ValueLayout.JAVA_LONG, ValueLayout.JAVA_INT);
47 
48     public static SysVx64Linker getInstance() {
49         final class Holder {
50             private static final SysVx64Linker INSTANCE = new SysVx64Linker();
51         }
52 
53         return Holder.INSTANCE;
54     }
55 
56     private SysVx64Linker() {
57         // Ensure there is only one instance
58     }
59 
60     @Override
61     protected MethodHandle arrangeDowncall(MethodType inferredMethodType, FunctionDescriptor function, LinkerOptions options) {
62         return CallArranger.arrangeDowncall(inferredMethodType, function, options);
63     }
64 
65     @Override
66     protected UpcallStubFactory arrangeUpcall(MethodType targetType, FunctionDescriptor function, LinkerOptions options) {
67         return CallArranger.arrangeUpcall(targetType, function, options);
68     }
69 
70     @Override
71     protected ByteOrder linkerByteOrder() {
72         return ByteOrder.LITTLE_ENDIAN;
73     }
74 
75     @Override
76     public Map<String, MemoryLayout> canonicalLayouts() {
77         return CANONICAL_LAYOUTS;
78     }
79 }