/* * Copyright (c) 2012, 2015, 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 org.graalvm.compiler.hotspot.nodes; import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; import java.util.BitSet; import org.graalvm.compiler.core.common.type.StampFactory; import org.graalvm.compiler.graph.NodeClass; import org.graalvm.compiler.lir.VirtualStackSlot; import org.graalvm.compiler.nodeinfo.NodeInfo; import org.graalvm.compiler.nodes.FixedWithNextNode; import org.graalvm.compiler.nodes.spi.LIRLowerable; import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; import org.graalvm.compiler.word.Word; import org.graalvm.compiler.word.WordTypes; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.Value; /** * Reserves a block of memory in the stack frame of a method. The block is reserved in the frame for * the entire execution of the associated method. */ @NodeInfo(cycles = CYCLES_2, size = SIZE_1) public final class AllocaNode extends FixedWithNextNode implements LIRLowerable { public static final NodeClass<AllocaNode> TYPE = NodeClass.create(AllocaNode.class); /** * The number of slots in block. */ protected final int slots; /** * The indexes of the object pointer slots in the block. Each such object pointer slot must be * initialized before any safepoint in the method otherwise the garbage collector will see * garbage values when processing these slots. */ protected final BitSet objects; public AllocaNode(@InjectedNodeParameter WordTypes wordTypes, int slots) { this(slots, wordTypes.getWordKind(), new BitSet()); } public AllocaNode(int slots, JavaKind wordKind, BitSet objects) { super(TYPE, StampFactory.forKind(wordKind)); this.slots = slots; this.objects = objects; } @Override public void generate(NodeLIRBuilderTool gen) { VirtualStackSlot array = gen.getLIRGeneratorTool().getResult().getFrameMapBuilder().allocateStackSlots(slots, objects, null); Value result = gen.getLIRGeneratorTool().emitAddress(array); gen.setResult(this, result); } @NodeIntrinsic public static native Word alloca(@ConstantNodeParameter int slots); }