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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/replacements/UnsafeLoadSnippets.java @ 11923:88fb9cba8751

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Simplify handling of unsafe store and unsafe load.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 07 Oct 2013 01:23:54 +0200
parents 03c781923573
children 66909d055314
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Christos Kotselidis <christos.kotselidis@oracle.com>
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.hotspot.replacements;
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24
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25 import static com.oracle.graal.hotspot.replacements.HotSpotReplacementsUtil.*;
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26 import static com.oracle.graal.replacements.SnippetTemplate.*;
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27
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28 import com.oracle.graal.api.code.*;
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29 import com.oracle.graal.hotspot.nodes.*;
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30 import com.oracle.graal.nodes.HeapAccess.BarrierType;
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31 import com.oracle.graal.nodes.extended.*;
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32 import com.oracle.graal.nodes.spi.*;
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33 import com.oracle.graal.replacements.*;
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34 import com.oracle.graal.replacements.SnippetTemplate.AbstractTemplates;
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35 import com.oracle.graal.replacements.SnippetTemplate.Arguments;
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36 import com.oracle.graal.replacements.SnippetTemplate.SnippetInfo;
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37 import com.oracle.graal.word.*;
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38
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39 public class UnsafeLoadSnippets implements Snippets {
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40
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41 @Snippet
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42 public static Object lowerUnsafeLoad(Object object, long offset, int disp) {
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43 Object fixedObject = FixedValueAnchorNode.getObject(object);
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44 long displacement = disp + offset;
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45 if (object instanceof java.lang.ref.Reference && referentOffset() == displacement) {
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46 return Word.fromObject(fixedObject).readObject((int) displacement, BarrierType.PRECISE, true);
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47 } else {
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48 return Word.fromObject(fixedObject).readObject((int) displacement, BarrierType.NONE, true);
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49 }
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50 }
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51
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52 public static class Templates extends AbstractTemplates {
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53
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54 private final SnippetInfo unsafeLoad = snippet(UnsafeLoadSnippets.class, "lowerUnsafeLoad");
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55
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56 public Templates(CodeCacheProvider runtime, Replacements replacements, TargetDescription target) {
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57 super(runtime, replacements, target);
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58 }
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59
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60 public void lower(UnsafeLoadNode load, @SuppressWarnings("unused") LoweringTool tool) {
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61 Arguments args = new Arguments(unsafeLoad, load.graph().getGuardsStage());
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62 args.add("object", load.object());
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63 args.add("offset", load.offset());
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64 template(args).instantiate(runtime, load, DEFAULT_REPLACER, args);
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65 }
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66 }
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67 }