Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/AbstractNewObjectNode.java @ 19172:76090119f89c
Do only constant folding when creating a new array length node in the parser.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
---|---|
date | Fri, 06 Feb 2015 04:33:04 +0100 |
parents | ec0733b5a90a |
children | 7e2c87dae93e |
line wrap: on
line source
/* * 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.util.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; /** * The {@code AbstractNewObjectNode} is the base class for the new instance and new array nodes. */ @NodeInfo public abstract class AbstractNewObjectNode extends DeoptimizingFixedWithNextNode implements Simplifiable, Lowerable { protected final boolean fillContents; public AbstractNewObjectNode(Stamp stamp, boolean fillContents) { super(stamp); this.fillContents = fillContents; } /** * @return <code>true</code> if the object's contents should be initialized to zero/null. */ public boolean fillContents() { return fillContents; } @Override public void simplify(SimplifierTool tool) { // poor man's escape analysis: check if the object can be trivially removed for (Node usage : usages()) { if (usage instanceof FixedValueAnchorNode) { if (((FixedValueAnchorNode) usage).usages().isNotEmpty()) { return; } } else if (usage instanceof WriteNode) { if (((WriteNode) usage).object() != this || usage.usages().isNotEmpty()) { // we would need to fix up the memory graph if the write has usages return; } } else { return; } } for (Node usage : usages().distinct().snapshot()) { List<Node> snapshot = usage.inputs().snapshot(); graph().removeFixed((FixedWithNextNode) usage); for (Node input : snapshot) { tool.removeIfUnused(input); } } List<Node> snapshot = inputs().snapshot(); graph().removeFixed(this); for (Node input : snapshot) { tool.removeIfUnused(input); } } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } @Override public boolean canDeoptimize() { return true; } }