Mercurial > hg > truffle
view graal/com.oracle.graal.compiler.test/src/com/oracle/graal/compiler/test/ReadAfterCheckCastTest.java @ 9267:950a385e059b
Make LoweringPhase reentrant.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Tue, 23 Apr 2013 17:49:10 +0200 |
parents | 223e01540fe8 |
children | 6f8d76dbe874 |
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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 java.util.*; import org.junit.*; import com.oracle.graal.api.code.*; import com.oracle.graal.debug.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.Lowerable.*; 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) { Debug.scope("FloatingReadTest", new DebugDumpScope(snippet), new Runnable() { // check shape of graph, with lots of assumptions. will probably fail if graph // structure changes significantly public void run() { StructuredGraph graph = parse(snippet); HighTierContext context = new HighTierContext(runtime(), new Assumptions(false), replacements); new LoweringPhase(LoweringType.BEFORE_GUARDS).apply(graph, context); new FloatingReadPhase().apply(graph); new EliminatePartiallyRedundantGuardsPhase(true, false).apply(graph); new ReadEliminationPhase().apply(graph); new CanonicalizerPhase().apply(graph, context); Debug.dump(graph, "After lowering"); ArrayList<MergeNode> merges = new ArrayList<>(); ArrayList<FloatingReadNode> reads = new ArrayList<>(); for (Node n : graph.getNodes()) { if (n instanceof MergeNode) { // check shape MergeNode merge = (MergeNode) n; if (merge.inputs().count() == 2) { for (EndNode m : merge.forwardEnds()) { if (m.predecessor() != null && m.predecessor() instanceof BeginNode && m.predecessor().predecessor() instanceof IfNode) { IfNode o = (IfNode) m.predecessor().predecessor(); if (o.falseSuccessor().next() instanceof DeoptimizeNode) { merges.add(merge); } } } } } if (n instanceof IntegerAddNode) { IntegerAddNode ian = (IntegerAddNode) n; Assert.assertTrue(ian.y() instanceof ConstantNode); Assert.assertTrue(ian.x() instanceof FloatingReadNode); reads.add((FloatingReadNode) ian.x()); } } Assert.assertTrue(merges.size() >= reads.size()); for (int i = 0; i < reads.size(); i++) { assertOrderedAfterSchedule(graph, merges.get(i), reads.get(i)); } } }); } }