Mercurial > hg > graal-compiler
view graal/com.oracle.graal.compiler.test/src/com/oracle/graal/compiler/test/ReadAfterCheckCastTest.java @ 15247:dea854d572a9
add LocationIdentity to CompareAndSwapNode
author | twisti |
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date | Fri, 18 Apr 2014 08:25:00 -1000 |
parents | 54ee3d025596 |
children | cd755faecaec |
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/* * Copyright (c) 2013, 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 com.oracle.graal.compiler.test; import org.junit.*; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.debug.*; import com.oracle.graal.debug.Debug.Scope; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.phases.common.*; import com.oracle.graal.phases.tiers.*; /* consider * B b = (B) a; * return b.x10; * * With snippets a typecheck is performed and if it was successful, a UnsafeCastNode is created. * For the read node, however, there is only a dependency to the UnsafeCastNode, but not to the * typecheck itself. With special crafting, it's possible to get the scheduler moving the * FloatingReadNode before the typecheck. Assuming the object is of the wrong type (here for * example A), an invalid field read is done. * * In order to avoid this situation, an anchor node is introduced in CheckCastSnippts. */ public class ReadAfterCheckCastTest extends GraphScheduleTest { public static long foo = 0; public static class A { public long x1; } public static class B extends A { public long x10; } public static long test1Snippet(A a) { if (foo > 4) { B b = (B) a; b.x10 += 1; return b.x10; } else { B b = (B) a; b.x10 += 1; return b.x10; } } @Test public void test1() { test("test1Snippet"); } private void test(final String snippet) { try (Scope s = Debug.scope("ReadAfterCheckCastTest", new DebugDumpScope(snippet))) { // check shape of graph, with lots of assumptions. will probably fail if graph // structure changes significantly StructuredGraph graph = parse(snippet); PhaseContext context = new PhaseContext(getProviders(), new Assumptions(false)); new LoweringPhase(new CanonicalizerPhase(true), LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context); new FloatingReadPhase().apply(graph); new OptimizeGuardAnchorsPhase().apply(graph); new ReadEliminationPhase().apply(graph); new CanonicalizerPhase(true).apply(graph, context); Debug.dump(graph, "After lowering"); for (FloatingReadNode node : graph.getNodes(ParameterNode.class).first().usages().filter(FloatingReadNode.class)) { // Checking that the parameter a is not directly used for the access to field // x10 (because x10 must be guarded by the checkcast). Assert.assertTrue(node.location().getLocationIdentity() == LocationIdentity.FINAL_LOCATION); } } catch (Throwable e) { throw Debug.handle(e); } } }