| /* |
| * Copyright (c) 2016, 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.GraalHotSpotVMConfig.INJECTED_VMCONFIG; |
| import static org.graalvm.compiler.hotspot.meta.HotSpotForeignCallsProviderImpl.IDENTITY_HASHCODE; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.biasedLockMaskInPlace; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.identityHashCode; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.identityHashCodeShift; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.loadWordFromObject; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.markOffset; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.uninitializedIdentityHashCodeValue; |
| import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.unlockedMask; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.FAST_PATH_PROBABILITY; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.NOT_FREQUENT_PROBABILITY; |
| import static org.graalvm.compiler.nodes.extended.BranchProbabilityNode.probability; |
| |
| import org.graalvm.compiler.api.replacements.Snippet; |
| import org.graalvm.compiler.hotspot.meta.HotSpotProviders; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.spi.LoweringTool; |
| import org.graalvm.compiler.replacements.SnippetTemplate; |
| 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 HashCodeSnippets implements Snippets { |
| |
| @Snippet |
| public static int identityHashCodeSnippet(final Object thisObj) { |
| if (probability(NOT_FREQUENT_PROBABILITY, thisObj == null)) { |
| return 0; |
| } |
| return computeHashCode(thisObj); |
| } |
| |
| static int computeHashCode(final Object x) { |
| Word mark = loadWordFromObject(x, markOffset(INJECTED_VMCONFIG)); |
| |
| // this code is independent from biased locking (although it does not look that way) |
| final Word biasedLock = mark.and(biasedLockMaskInPlace(INJECTED_VMCONFIG)); |
| if (probability(FAST_PATH_PROBABILITY, biasedLock.equal(Word.unsigned(unlockedMask(INJECTED_VMCONFIG))))) { |
| int hash = (int) mark.unsignedShiftRight(identityHashCodeShift(INJECTED_VMCONFIG)).rawValue(); |
| if (probability(FAST_PATH_PROBABILITY, hash != uninitializedIdentityHashCodeValue(INJECTED_VMCONFIG))) { |
| return hash; |
| } |
| } |
| return identityHashCode(IDENTITY_HASHCODE, x); |
| } |
| |
| public static class Templates extends AbstractTemplates { |
| |
| private final SnippetInfo identityHashCodeSnippet = snippet(HashCodeSnippets.class, "identityHashCodeSnippet", HotSpotReplacementsUtil.MARK_WORD_LOCATION); |
| |
| public Templates(HotSpotProviders providers, TargetDescription target) { |
| super(providers, providers.getSnippetReflection(), target); |
| } |
| |
| public void lower(IdentityHashCodeNode node, LoweringTool tool) { |
| StructuredGraph graph = node.graph(); |
| Arguments args = new Arguments(identityHashCodeSnippet, graph.getGuardsStage(), tool.getLoweringStage()); |
| args.add("thisObj", node.object); |
| SnippetTemplate template = template(args); |
| template.instantiate(providers.getMetaAccess(), node, SnippetTemplate.DEFAULT_REPLACER, args); |
| } |
| |
| } |
| |
| } |