--- /dev/null 2016-05-31 09:42:47.975716356 -0700 +++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.api.directives.test/src/org/graalvm/compiler/api/directives/test/ControlFlowAnchorDirectiveTest.java 2016-12-09 00:46:38.581788469 -0800 @@ -0,0 +1,260 @@ +/* + * Copyright (c) 2015, 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.api.directives.test; + +import java.lang.annotation.ElementType; +import java.lang.annotation.Repeatable; +import java.lang.annotation.Retention; +import java.lang.annotation.RetentionPolicy; +import java.lang.annotation.Target; +import java.util.Arrays; +import java.util.Collections; +import java.util.List; + +import org.junit.Assert; +import org.junit.Test; + +import org.graalvm.compiler.api.directives.GraalDirectives; +import org.graalvm.compiler.core.test.GraalCompilerTest; +import org.graalvm.compiler.graph.Node; +import org.graalvm.compiler.graph.iterators.NodeIterable; +import org.graalvm.compiler.nodes.IfNode; +import org.graalvm.compiler.nodes.LoopBeginNode; +import org.graalvm.compiler.nodes.ReturnNode; +import org.graalvm.compiler.nodes.StructuredGraph; +import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions; +import org.graalvm.compiler.nodes.debug.ControlFlowAnchorNode; + +import jdk.vm.ci.meta.ResolvedJavaMethod; + +public class ControlFlowAnchorDirectiveTest extends GraalCompilerTest { + + @Retention(RetentionPolicy.RUNTIME) + @Target(ElementType.METHOD) + @Repeatable(AnchorSnippet.class) + private @interface NodeCount { + + Class nodeClass(); + + int expectedCount(); + } + + @Retention(RetentionPolicy.RUNTIME) + @Target(ElementType.METHOD) + private @interface AnchorSnippet { + NodeCount[] value(); + } + + @NodeCount(nodeClass = ReturnNode.class, expectedCount = 1) + public static int verifyMergeSnippet(int arg) { + if (arg > 5) { + return 1; + } else { + return 2; + } + } + + @NodeCount(nodeClass = ControlFlowAnchorNode.class, expectedCount = 2) + @NodeCount(nodeClass = ReturnNode.class, expectedCount = 2) + public static int preventMergeSnippet(int arg) { + if (arg > 5) { + GraalDirectives.controlFlowAnchor(); + return 1; + } else { + GraalDirectives.controlFlowAnchor(); + return 2; + } + } + + @Test + public void testMerge() { + test("verifyMergeSnippet", 42); + test("preventMergeSnippet", 42); + } + + @NodeCount(nodeClass = ReturnNode.class, expectedCount = 2) + public static int verifyDuplicateSnippet(int arg) { + int ret; + if (arg > 5) { + ret = 17; + } else { + ret = arg; + } + return 42 / ret; + } + + @NodeCount(nodeClass = ControlFlowAnchorNode.class, expectedCount = 1) + @NodeCount(nodeClass = ReturnNode.class, expectedCount = 1) + public static int preventDuplicateSnippet(int arg) { + int ret; + if (arg > 5) { + ret = 17; + } else { + ret = arg; + } + GraalDirectives.controlFlowAnchor(); + return 42 / ret; + } + + @Test + public void testDuplicate() { + // test("verifyDuplicateSnippet", 42); + test("preventDuplicateSnippet", 42); + } + + @NodeCount(nodeClass = LoopBeginNode.class, expectedCount = 0) + public static int verifyFullUnrollSnippet(int arg) { + int ret = arg; + for (int i = 0; i < 5; i++) { + ret = ret * 3 + 1; + } + return ret; + } + + @NodeCount(nodeClass = LoopBeginNode.class, expectedCount = 1) + @NodeCount(nodeClass = ControlFlowAnchorNode.class, expectedCount = 1) + public static int preventFullUnrollSnippet(int arg) { + int ret = arg; + for (int i = 0; i < 5; i++) { + GraalDirectives.controlFlowAnchor(); + ret = ret * 3 + 1; + } + return ret; + } + + @Test + public void testFullUnroll() { + test("verifyFullUnrollSnippet", 42); + test("preventFullUnrollSnippet", 42); + } + + @NodeCount(nodeClass = LoopBeginNode.class, expectedCount = 1) + @NodeCount(nodeClass = IfNode.class, expectedCount = 4) + public static void verifyPeelSnippet(int arg) { + int ret = arg; + while (ret > 1) { + if (ret % 2 == 0) { + ret /= 2; + } else { + ret = 3 * ret + 1; + } + } + } + + @NodeCount(nodeClass = LoopBeginNode.class, expectedCount = 1) + @NodeCount(nodeClass = IfNode.class, expectedCount = 2) + public static void preventPeelSnippet(int arg) { + int ret = arg; + while (ret > 1) { + GraalDirectives.controlFlowAnchor(); + if (ret % 2 == 0) { + GraalDirectives.controlFlowAnchor(); + ret /= 2; + } else { + ret = 3 * ret + 1; + } + } + } + + @Test + public void testPeel() { + test("preventPeelSnippet", 42); + } + + @NodeCount(nodeClass = LoopBeginNode.class, expectedCount = 2) + public static void verifyUnswitchSnippet(int arg, boolean flag) { + int ret = arg; + while (GraalDirectives.injectBranchProbability(0.9999, ret < 1000)) { + if (flag) { + ret = ret * 2 + 1; + } else { + ret = ret * 3 + 1; + } + } + } + + @NodeCount(nodeClass = LoopBeginNode.class, expectedCount = 1) + @NodeCount(nodeClass = IfNode.class, expectedCount = 2) + public static void preventUnswitchSnippet(int arg, boolean flag) { + int ret = arg; + while (GraalDirectives.injectBranchProbability(0.9999, ret < 1000)) { + if (flag) { + GraalDirectives.controlFlowAnchor(); + ret++; + } else { + ret += 2; + } + } + } + + @Test + public void testUnswitch() { + test("verifyUnswitchSnippet", 0, false); + test("preventUnswitchSnippet", 0, false); + } + + /** + * Cloning a ControlFlowAnchorNode is not allowed but cloning a whole graph containing one is + * ok. + */ + @Test + public void testClone() { + StructuredGraph g = parseEager("preventPeelSnippet", AllowAssumptions.NO); + g.copy(); + } + + private static List getNodeCountAnnotations(StructuredGraph graph) { + ResolvedJavaMethod method = graph.method(); + AnchorSnippet snippet = method.getAnnotation(AnchorSnippet.class); + if (snippet != null) { + return Arrays.asList(snippet.value()); + } + + NodeCount single = method.getAnnotation(NodeCount.class); + if (single != null) { + return Collections.singletonList(single); + } + + return Collections.emptyList(); + } + + @Override + protected boolean checkLowTierGraph(StructuredGraph graph) { + List anchors = graph.getNodes().filter(ControlFlowAnchorNode.class).snapshot(); + for (int i = 0; i < anchors.size(); i++) { + ControlFlowAnchorNode a = anchors.get(i); + for (int j = i + 1; j < anchors.size(); j++) { + ControlFlowAnchorNode b = anchors.get(j); + if (a.valueEquals(b)) { + Assert.fail("found duplicated control flow anchors (" + a + " and " + b + ")"); + } + } + } + + for (NodeCount nodeCount : getNodeCountAnnotations(graph)) { + NodeIterable nodes = graph.getNodes().filter(nodeCount.nodeClass()); + Assert.assertEquals(nodeCount.nodeClass().getSimpleName(), nodeCount.expectedCount(), nodes.count()); + } + return true; + } +}