| /* |
| * Copyright (c) 2013, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.hotspot.replacements; |
| |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.referentOffset; |
| import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER; |
| |
| import org.graalvm.compiler.api.replacements.Snippet; |
| import org.graalvm.compiler.hotspot.meta.HotSpotProviders; |
| import org.graalvm.compiler.nodes.extended.FixedValueAnchorNode; |
| import org.graalvm.compiler.nodes.extended.UnsafeLoadNode; |
| import org.graalvm.compiler.nodes.memory.HeapAccess.BarrierType; |
| import org.graalvm.compiler.nodes.spi.LoweringTool; |
| import org.graalvm.compiler.replacements.SnippetTemplate.AbstractTemplates; |
| import org.graalvm.compiler.replacements.SnippetTemplate.Arguments; |
| import org.graalvm.compiler.replacements.SnippetTemplate.SnippetInfo; |
| import org.graalvm.compiler.replacements.Snippets; |
| import org.graalvm.compiler.word.Word; |
| |
| import jdk.vm.ci.code.TargetDescription; |
| |
| public class UnsafeLoadSnippets implements Snippets { |
| |
| @Snippet |
| public static Object lowerUnsafeLoad(Object object, long offset) { |
| Object fixedObject = FixedValueAnchorNode.getObject(object); |
| if (object instanceof java.lang.ref.Reference && referentOffset() == offset) { |
| return Word.objectToTrackedPointer(fixedObject).readObject((int) offset, BarrierType.PRECISE); |
| } else { |
| return Word.objectToTrackedPointer(fixedObject).readObject((int) offset, BarrierType.NONE); |
| } |
| } |
| |
| public static class Templates extends AbstractTemplates { |
| |
| private final SnippetInfo unsafeLoad = snippet(UnsafeLoadSnippets.class, "lowerUnsafeLoad"); |
| |
| public Templates(HotSpotProviders providers, TargetDescription target) { |
| super(providers, providers.getSnippetReflection(), target); |
| } |
| |
| public void lower(UnsafeLoadNode load, LoweringTool tool) { |
| Arguments args = new Arguments(unsafeLoad, load.graph().getGuardsStage(), tool.getLoweringStage()); |
| args.add("object", load.object()); |
| args.add("offset", load.offset()); |
| template(args).instantiate(providers.getMetaAccess(), load, DEFAULT_REPLACER, args); |
| } |
| } |
| } |