| /* |
| * 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.NodeSize.SIZE_1; |
| |
| import java.util.BitSet; |
| |
| import org.graalvm.compiler.core.common.type.StampFactory; |
| import org.graalvm.compiler.graph.Node; |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.lir.VirtualStackSlot; |
| import org.graalvm.compiler.nodeinfo.NodeCycles; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| import org.graalvm.compiler.nodes.calc.FloatingNode; |
| 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; |
| |
| /** |
| * Node that is used to maintain a stack based counter of how many locks are currently held. |
| */ |
| @NodeInfo(cycles = NodeCycles.CYCLES_2, size = SIZE_1) |
| public final class MonitorCounterNode extends FloatingNode implements LIRLowerable, Node.ValueNumberable { |
| public static final NodeClass<MonitorCounterNode> TYPE = NodeClass.create(MonitorCounterNode.class); |
| |
| public MonitorCounterNode(@InjectedNodeParameter WordTypes wordTypes) { |
| super(TYPE, StampFactory.forKind(wordTypes.getWordKind())); |
| } |
| |
| @Override |
| public void generate(NodeLIRBuilderTool gen) { |
| assert graph().getNodes().filter(MonitorCounterNode.class).count() == 1 : "monitor counters not canonicalized to single instance"; |
| VirtualStackSlot counter = gen.getLIRGeneratorTool().getResult().getFrameMapBuilder().allocateStackSlots(1, new BitSet(0), null); |
| Value result = gen.getLIRGeneratorTool().emitAddress(counter); |
| gen.setResult(this, result); |
| } |
| |
| @NodeIntrinsic |
| public static native Word counter(); |
| } |