1 /*
   2  * Copyright (c) 2009, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.nodes.java;
  26 
  27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_8;
  28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_8;
  29 
  30 import org.graalvm.compiler.core.common.type.Stamp;
  31 import org.graalvm.compiler.graph.NodeClass;
  32 import org.graalvm.compiler.nodeinfo.NodeInfo;
  33 import org.graalvm.compiler.nodes.DeoptimizingFixedWithNextNode;
  34 import org.graalvm.compiler.nodes.FrameState;
  35 import org.graalvm.compiler.nodes.extended.MembarNode;
  36 import org.graalvm.compiler.nodes.spi.Lowerable;
  37 import org.graalvm.compiler.nodes.spi.LoweringTool;
  38 
  39 import jdk.vm.ci.code.MemoryBarriers;
  40 
  41 /**
  42  * The {@code AbstractNewObjectNode} is the base class for the new instance and new array nodes.
  43  */
  44 @NodeInfo(cycles = CYCLES_8, cyclesRationale = "tlab alloc + header init", size = SIZE_8)
  45 public abstract class AbstractNewObjectNode extends DeoptimizingFixedWithNextNode implements Lowerable {
  46 
  47     public static final NodeClass<AbstractNewObjectNode> TYPE = NodeClass.create(AbstractNewObjectNode.class);
  48     protected final boolean fillContents;
  49 
  50     /**
  51      * Controls whether this allocation emits a {@link MembarNode} with
  52      * {@link MemoryBarriers#STORE_STORE} as part of the object initialization.
  53      */
  54     protected boolean emitMemoryBarrier = true;
  55 
  56     protected AbstractNewObjectNode(NodeClass<? extends AbstractNewObjectNode> c, Stamp stamp, boolean fillContents, FrameState stateBefore) {
  57         super(c, stamp, stateBefore);
  58         this.fillContents = fillContents;
  59     }
  60 
  61     /**
  62      * @return <code>true</code> if the object's contents should be initialized to zero/null.
  63      */
  64     public boolean fillContents() {
  65         return fillContents;
  66     }
  67 
  68     @Override
  69     public void lower(LoweringTool tool) {
  70         tool.getLowerer().lower(this, tool);
  71     }
  72 
  73     @Override
  74     public boolean canDeoptimize() {
  75         return true;
  76     }
  77 
  78     public boolean emitMemoryBarrier() {
  79         return emitMemoryBarrier;
  80     }
  81 
  82     public void clearEmitMemoryBarrier() {
  83         this.emitMemoryBarrier = false;
  84     }
  85 }