1/*
2 * Copyright (c) 2015, 2016, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
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22 */
23package org.graalvm.compiler.hotspot.aarch64;
24
25import static jdk.vm.ci.hotspot.HotSpotCompressedNullConstant.COMPRESSED_NULL;
26import static jdk.vm.ci.meta.JavaConstant.INT_0;
27import static jdk.vm.ci.meta.JavaConstant.LONG_0;
28
29import org.graalvm.compiler.core.aarch64.AArch64MoveFactory;
30import org.graalvm.compiler.lir.LIRInstruction;
31
32import jdk.vm.ci.hotspot.HotSpotCompressedNullConstant;
33import jdk.vm.ci.hotspot.HotSpotConstant;
34import jdk.vm.ci.hotspot.HotSpotMetaspaceConstant;
35import jdk.vm.ci.hotspot.HotSpotObjectConstant;
36import jdk.vm.ci.meta.AllocatableValue;
37import jdk.vm.ci.meta.Constant;
38
39public class AArch64HotSpotMoveFactory extends AArch64MoveFactory {
40
41    @Override
42    public boolean canInlineConstant(Constant c) {
43        if (HotSpotCompressedNullConstant.COMPRESSED_NULL.equals(c)) {
44            return true;
45        } else if (c instanceof HotSpotObjectConstant || c instanceof HotSpotMetaspaceConstant) {
46            return false;
47        } else {
48            return super.canInlineConstant(c);
49        }
50    }
51
52    @Override
53    public LIRInstruction createLoad(AllocatableValue dst, Constant src) {
54        Constant usedSource;
55        if (COMPRESSED_NULL.equals(src)) {
56            usedSource = INT_0;
57        } else if (src instanceof HotSpotObjectConstant && ((HotSpotObjectConstant) src).isNull()) {
58            usedSource = LONG_0;
59        } else {
60            usedSource = src;
61        }
62        if (usedSource instanceof HotSpotConstant) {
63            HotSpotConstant constant = (HotSpotConstant) usedSource;
64            if (constant.isCompressed()) {
65                return new AArch64HotSpotMove.LoadHotSpotObjectConstantInline(constant, dst);
66            } else {
67                // XXX Do we need the constant table?
68                // return new SPARCHotSpotMove.LoadHotSpotObjectConstantFromTable(constant, dst,
69                // constantTableBaseProvider.getConstantTableBase());
70                return new AArch64HotSpotMove.LoadHotSpotObjectConstantInline(constant, dst);
71            }
72        } else {
73            return super.createLoad(dst, usedSource);
74        }
75    }
76}
77