| /* |
| * Copyright (c) 2013, 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.replacements; |
| |
| import static org.graalvm.compiler.core.common.GraalOptions.SnippetCounters; |
| import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_IGNORED; |
| import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_IGNORED; |
| import static org.graalvm.compiler.replacements.SnippetTemplate.DEFAULT_REPLACER; |
| |
| import java.lang.reflect.Field; |
| import java.util.Arrays; |
| |
| import org.graalvm.compiler.api.replacements.Fold; |
| import org.graalvm.compiler.api.replacements.Snippet; |
| import org.graalvm.compiler.api.replacements.Snippet.ConstantParameter; |
| import org.graalvm.compiler.api.replacements.SnippetReflectionProvider; |
| import org.graalvm.compiler.core.common.LocationIdentity; |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| import org.graalvm.compiler.debug.GraalError; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodes.FixedWithNextNode; |
| import org.graalvm.compiler.nodes.NamedLocationIdentity; |
| import org.graalvm.compiler.nodes.StructuredGraph; |
| import org.graalvm.compiler.nodes.ValueNode; |
| import org.graalvm.compiler.nodes.spi.Lowerable; |
| import org.graalvm.compiler.nodes.spi.LoweringTool; |
| import org.graalvm.compiler.phases.util.Providers; |
| 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.word.ObjectAccess; |
| |
| import jdk.vm.ci.code.TargetDescription; |
| import sun.misc.Unsafe; |
| |
| /** |
| * This node can be used to add a counter to the code that will estimate the dynamic number of calls |
| * by adding an increment to the compiled code. This should of course only be used for |
| * debugging/testing purposes. |
| * |
| * A unique counter will be created for each unique name passed to the constructor. Depending on the |
| * value of withContext, the name of the root method is added to the counter's name. |
| */ |
| @NodeInfo(cycles = CYCLES_IGNORED, size = SIZE_IGNORED) |
| public class SnippetCounterNode extends FixedWithNextNode implements Lowerable { |
| |
| public static final NodeClass<SnippetCounterNode> TYPE = NodeClass.create(SnippetCounterNode.class); |
| |
| @Input protected ValueNode increment; |
| |
| protected final SnippetCounter counter; |
| |
| public SnippetCounterNode(SnippetCounter counter, ValueNode increment) { |
| super(TYPE, StampFactory.forVoid()); |
| this.counter = counter; |
| this.increment = increment; |
| } |
| |
| public SnippetCounter getCounter() { |
| return counter; |
| } |
| |
| public ValueNode getIncrement() { |
| return increment; |
| } |
| |
| @NodeIntrinsic |
| public static native void add(@ConstantNodeParameter SnippetCounter counter, int increment); |
| |
| public static void increment(@ConstantNodeParameter SnippetCounter counter) { |
| add(counter, 1); |
| } |
| |
| @Override |
| public void lower(LoweringTool tool) { |
| if (graph().getGuardsStage().areFrameStatesAtDeopts()) { |
| SnippetCounterSnippets.Templates templates = tool.getReplacements().getSnippetTemplateCache(SnippetCounterSnippets.Templates.class); |
| templates.lower(this, tool); |
| } |
| } |
| |
| /** |
| * When {@link #SnippetCounters} are enabled make sure {@link #SNIPPET_COUNTER_LOCATION} is part |
| * of the private locations. |
| * |
| * @param privateLocations |
| * @return a copy of privateLocations with any needed locations added |
| */ |
| public static LocationIdentity[] addSnippetCounters(LocationIdentity[] privateLocations) { |
| if (SnippetCounters.getValue()) { |
| for (LocationIdentity location : privateLocations) { |
| if (location.equals(SNIPPET_COUNTER_LOCATION)) { |
| return privateLocations; |
| } |
| } |
| LocationIdentity[] result = Arrays.copyOf(privateLocations, privateLocations.length + 1); |
| result[result.length - 1] = SnippetCounterNode.SNIPPET_COUNTER_LOCATION; |
| return result; |
| } |
| return privateLocations; |
| } |
| |
| /** |
| * We do not want to use the {@link LocationIdentity} of the {@link SnippetCounter#value} field, |
| * so that the usage in snippets is always possible. If a method accesses the counter via the |
| * field and the snippet, the result might not be correct though. |
| */ |
| public static final LocationIdentity SNIPPET_COUNTER_LOCATION = NamedLocationIdentity.mutable("SnippetCounter"); |
| |
| static class SnippetCounterSnippets implements Snippets { |
| |
| @Fold |
| static int countOffset() { |
| try { |
| return (int) UNSAFE.objectFieldOffset(SnippetCounter.class.getDeclaredField("value")); |
| } catch (Exception e) { |
| throw new GraalError(e); |
| } |
| } |
| |
| @Snippet |
| public static void add(@ConstantParameter SnippetCounter counter, int increment) { |
| long loadedValue = ObjectAccess.readLong(counter, countOffset(), SNIPPET_COUNTER_LOCATION); |
| ObjectAccess.writeLong(counter, countOffset(), loadedValue + increment, SNIPPET_COUNTER_LOCATION); |
| } |
| |
| public static class Templates extends AbstractTemplates { |
| |
| private final SnippetInfo add = snippet(SnippetCounterSnippets.class, "add", SNIPPET_COUNTER_LOCATION); |
| |
| Templates(Providers providers, SnippetReflectionProvider snippetReflection, TargetDescription target) { |
| super(providers, snippetReflection, target); |
| } |
| |
| public void lower(SnippetCounterNode counter, LoweringTool tool) { |
| StructuredGraph graph = counter.graph(); |
| Arguments args = new Arguments(add, graph.getGuardsStage(), tool.getLoweringStage()); |
| args.addConst("counter", counter.getCounter()); |
| args.add("increment", counter.getIncrement()); |
| |
| template(args).instantiate(providers.getMetaAccess(), counter, DEFAULT_REPLACER, args); |
| } |
| } |
| } |
| |
| private static final Unsafe UNSAFE = initUnsafe(); |
| |
| private static Unsafe initUnsafe() { |
| try { |
| return Unsafe.getUnsafe(); |
| } catch (SecurityException se) { |
| try { |
| Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe"); |
| theUnsafe.setAccessible(true); |
| return (Unsafe) theUnsafe.get(Unsafe.class); |
| } catch (Exception e) { |
| throw new RuntimeException("exception while trying to get Unsafe", e); |
| } |
| } |
| } |
| } |