1 /*
   2  * Copyright (c) 2009, 2015, 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 package org.graalvm.compiler.nodes.java;
  24 
  25 import java.util.Collections;
  26 
  27 import org.graalvm.compiler.core.common.type.StampFactory;
  28 import org.graalvm.compiler.core.common.type.TypeReference;
  29 import org.graalvm.compiler.graph.NodeClass;
  30 import org.graalvm.compiler.nodeinfo.NodeInfo;
  31 import org.graalvm.compiler.nodes.ConstantNode;
  32 import org.graalvm.compiler.nodes.FrameState;
  33 import org.graalvm.compiler.nodes.ValueNode;
  34 import org.graalvm.compiler.nodes.spi.VirtualizableAllocation;
  35 import org.graalvm.compiler.nodes.spi.VirtualizerTool;
  36 import org.graalvm.compiler.nodes.virtual.VirtualArrayNode;
  37 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode;
  38 
  39 import jdk.vm.ci.meta.ResolvedJavaType;
  40 
  41 /**
  42  * The {@code NewArrayNode} is used for all array allocations where the element type is know at
  43  * compile time.
  44  */
  45 // JaCoCo Exclude
  46 @NodeInfo
  47 public class NewArrayNode extends AbstractNewArrayNode implements VirtualizableAllocation {
  48 
  49     public static final NodeClass<NewArrayNode> TYPE = NodeClass.create(NewArrayNode.class);
  50     private final ResolvedJavaType elementType;
  51 
  52     public NewArrayNode(ResolvedJavaType elementType, ValueNode length, boolean fillContents) {
  53         this(elementType, length, fillContents, null);
  54     }
  55 
  56     public NewArrayNode(ResolvedJavaType elementType, ValueNode length, boolean fillContents, FrameState stateBefore) {
  57         this(TYPE, elementType, length, fillContents, stateBefore);
  58     }
  59 
  60     protected NewArrayNode(NodeClass<? extends NewArrayNode> c, ResolvedJavaType elementType, ValueNode length, boolean fillContents, FrameState stateBefore) {
  61         super(c, StampFactory.objectNonNull(TypeReference.createExactTrusted(elementType.getArrayClass())), length, fillContents, stateBefore);
  62         this.elementType = elementType;
  63     }
  64 
  65     @NodeIntrinsic
  66     private static native Object newArray(@ConstantNodeParameter Class<?> elementType, int length, @ConstantNodeParameter boolean fillContents);
  67 
  68     public static Object newUninitializedArray(Class<?> elementType, int length) {
  69         return newArray(elementType, length, false);
  70     }
  71 
  72     /**
  73      * Gets the element type of the array.
  74      *
  75      * @return the element type of the array
  76      */
  77     public ResolvedJavaType elementType() {
  78         return elementType;
  79     }
  80 
  81     @Override
  82     public void virtualize(VirtualizerTool tool) {
  83         ValueNode lengthAlias = tool.getAlias(length());
  84         if (lengthAlias.asConstant() != null) {
  85             int constantLength = lengthAlias.asJavaConstant().asInt();
  86             if (constantLength >= 0 && constantLength < tool.getMaximumEntryCount()) {
  87                 ValueNode[] state = new ValueNode[constantLength];
  88                 ConstantNode defaultForKind = constantLength == 0 ? null : defaultElementValue();
  89                 for (int i = 0; i < constantLength; i++) {
  90                     state[i] = defaultForKind;
  91                 }
  92                 VirtualObjectNode virtualObject = createVirtualArrayNode(constantLength);
  93                 tool.createVirtualObject(virtualObject, state, Collections.<MonitorIdNode> emptyList(), false);
  94                 tool.replaceWithVirtual(virtualObject);
  95             }
  96         }
  97     }
  98 
  99     protected VirtualArrayNode createVirtualArrayNode(int constantLength) {
 100         return new VirtualArrayNode(elementType(), constantLength);
 101     }
 102 
 103     /* Factored out in a separate method so that subclasses can override it. */
 104     protected ConstantNode defaultElementValue() {
 105         return ConstantNode.defaultForKind(elementType().getJavaKind(), graph());
 106     }
 107 }