Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/NewInstanceNode.java @ 12380:e027a51bdd33
exclude java.lang.ref.Reference from Escape Analysis
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Mon, 14 Oct 2013 10:45:02 +0200 |
parents | 0fc653a9e019 |
children | c6ab6ae1b360 |
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/* * Copyright (c) 2009, 2011, 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.nodes.java; import java.lang.ref.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.virtual.*; /** * The {@code NewInstanceNode} represents the allocation of an instance class object. */ @NodeInfo(nameTemplate = "New {p#instanceClass/s}") public final class NewInstanceNode extends DeoptimizingFixedWithNextNode implements Canonicalizable, Lowerable, VirtualizableAllocation { private final ResolvedJavaType instanceClass; private final boolean fillContents; /** * Constructs a NewInstanceNode. * * @param type the class being allocated * @param fillContents determines whether the new object's fields should be initialized to * zero/null. */ public NewInstanceNode(ResolvedJavaType type, boolean fillContents) { super(StampFactory.exactNonNull(type)); assert !type.isArray(); this.instanceClass = type; this.fillContents = fillContents; } /** * Gets the instance class being allocated by this node. * * @return the instance class allocated */ public ResolvedJavaType instanceClass() { return instanceClass; } /** * @return <code>true</code> if the fields of the new object will be initialized. */ public boolean fillContents() { return fillContents; } @Override public Node canonical(CanonicalizerTool tool) { if (usages().isEmpty()) { return null; } else { return this; } } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } @Override public void virtualize(VirtualizerTool tool) { /* * Reference objects can escape into their ReferenceQueue at any safepoint, therefore * they're excluded from escape analysis. */ if (!tool.getMetaAccessProvider().lookupJavaType(Reference.class).isAssignableFrom(instanceClass)) { VirtualInstanceNode virtualObject = new VirtualInstanceNode(instanceClass(), true); ResolvedJavaField[] fields = virtualObject.getFields(); ValueNode[] state = new ValueNode[fields.length]; for (int i = 0; i < state.length; i++) { state[i] = ConstantNode.defaultForKind(fields[i].getType().getKind(), graph()); } tool.createVirtualObject(virtualObject, state, null); tool.replaceWithVirtual(virtualObject); } } @Override public boolean canDeoptimize() { return true; } }