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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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).
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 * 2 along with this work; if not, write to the Free Software Foundation,
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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 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.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.
/** * 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.
/** * The number of slots in block. */
protected final int slots; public AllocaNode(@InjectedNodeParameter WordTypes wordTypes, int slots) { super(TYPE, StampFactory.forKind(wordTypes.getWordKind())); this.slots = slots; } @Override public void generate(NodeLIRBuilderTool gen) { VirtualStackSlot array = gen.getLIRGeneratorTool().allocateStackSlots(slots); Value result = gen.getLIRGeneratorTool().emitAddress(array); gen.setResult(this, result); } @NodeIntrinsic public static native Word alloca(@ConstantNodeParameter int slots); }