1 /* 2 * Copyright (c) 2012, 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.hotspot.nodes; 24 25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; 26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; 27 28 import java.util.BitSet; 29 30 import org.graalvm.compiler.core.common.type.StampFactory; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.lir.VirtualStackSlot; 33 import org.graalvm.compiler.nodeinfo.NodeInfo; 34 import org.graalvm.compiler.nodes.FixedWithNextNode; 35 import org.graalvm.compiler.nodes.spi.LIRLowerable; 36 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 37 import org.graalvm.compiler.word.Word; 38 import org.graalvm.compiler.word.WordTypes; 39 40 import jdk.vm.ci.meta.JavaKind; 41 import jdk.vm.ci.meta.Value; 42 43 /** 44 * Reserves a block of memory in the stack frame of a method. The block is reserved in the frame for 45 * the entire execution of the associated method. 46 */ 47 @NodeInfo(cycles = CYCLES_2, size = SIZE_1) 48 public final class AllocaNode extends FixedWithNextNode implements LIRLowerable { 49 50 public static final NodeClass<AllocaNode> TYPE = NodeClass.create(AllocaNode.class); 51 /** 52 * The number of slots in block. 53 */ 54 protected final int slots; 55 56 /** 57 * The indexes of the object pointer slots in the block. Each such object pointer slot must be 58 * initialized before any safepoint in the method otherwise the garbage collector will see 59 * garbage values when processing these slots. 60 */ 61 protected final BitSet objects; 62 63 public AllocaNode(@InjectedNodeParameter WordTypes wordTypes, int slots) { 64 this(slots, wordTypes.getWordKind(), new BitSet()); 65 } 66 67 public AllocaNode(int slots, JavaKind wordKind, BitSet objects) { 68 super(TYPE, StampFactory.forKind(wordKind)); 69 this.slots = slots; 70 this.objects = objects; 71 } 72 73 @Override 74 public void generate(NodeLIRBuilderTool gen) { 75 VirtualStackSlot array = gen.getLIRGeneratorTool().getResult().getFrameMapBuilder().allocateStackSlots(slots, objects, null); 76 Value result = gen.getLIRGeneratorTool().emitAddress(array); 77 gen.setResult(this, result); 78 } 79 80 @NodeIntrinsic 81 public static native Word alloca(@ConstantNodeParameter int slots); 82 }