1 /* 2 * Copyright (c) 2013, 2015, 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 21 * questions. 22 */ 23 package org.graalvm.compiler.hotspot.replacements; 24 25 import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.referentOffset; 26 import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER; 27 28 import org.graalvm.compiler.api.replacements.Snippet; 29 import org.graalvm.compiler.hotspot.meta.HotSpotProviders; 30 import org.graalvm.compiler.nodes.extended.FixedValueAnchorNode; 31 import org.graalvm.compiler.nodes.extended.RawLoadNode; 32 import org.graalvm.compiler.nodes.memory.HeapAccess.BarrierType; 33 import org.graalvm.compiler.nodes.spi.LoweringTool; 34 import org.graalvm.compiler.options.OptionValues; 35 import org.graalvm.compiler.replacements.SnippetTemplate.AbstractTemplates; 36 import org.graalvm.compiler.replacements.SnippetTemplate.Arguments; 37 import org.graalvm.compiler.replacements.SnippetTemplate.SnippetInfo; 38 import org.graalvm.compiler.replacements.Snippets; 39 import org.graalvm.compiler.word.Word; 40 41 import jdk.vm.ci.code.TargetDescription; 42 43 public class UnsafeLoadSnippets implements Snippets { 44 45 @Snippet 46 public static Object lowerUnsafeLoad(Object object, long offset) { 47 Object fixedObject = FixedValueAnchorNode.getObject(object); 48 if (object instanceof java.lang.ref.Reference && referentOffset() == offset) { 49 return Word.objectToTrackedPointer(fixedObject).readObject((int) offset, BarrierType.PRECISE); 50 } else { 51 return Word.objectToTrackedPointer(fixedObject).readObject((int) offset, BarrierType.NONE); 52 } 53 } 54 55 public static class Templates extends AbstractTemplates { 56 57 private final SnippetInfo unsafeLoad = snippet(UnsafeLoadSnippets.class, "lowerUnsafeLoad"); 58 59 public Templates(OptionValues options, HotSpotProviders providers, TargetDescription target) { 60 super(options, providers, providers.getSnippetReflection(), target); 61 } 62 63 public void lower(RawLoadNode load, LoweringTool tool) { 64 Arguments args = new Arguments(unsafeLoad, load.graph().getGuardsStage(), tool.getLoweringStage()); 65 args.add("object", load.object()); 66 args.add("offset", load.offset()); 67 template(args).instantiate(providers.getMetaAccess(), load, DEFAULT_REPLACER, args); 68 } 69 } 70 }