1 /* 2 * Copyright (c) 2012, 2018, 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 24 25 package org.graalvm.compiler.hotspot.nodes; 26 27 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; 28 29 import org.graalvm.compiler.core.common.type.StampFactory; 30 import org.graalvm.compiler.graph.Node; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.lir.VirtualStackSlot; 33 import org.graalvm.compiler.nodeinfo.NodeCycles; 34 import org.graalvm.compiler.nodeinfo.NodeInfo; 35 import org.graalvm.compiler.nodes.calc.FloatingNode; 36 import org.graalvm.compiler.nodes.spi.LIRLowerable; 37 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 38 import org.graalvm.compiler.word.Word; 39 import org.graalvm.compiler.word.WordTypes; 40 41 import jdk.vm.ci.meta.Value; 42 43 /** 44 * Node that is used to maintain a stack based counter of how many locks are currently held. 45 */ 46 @NodeInfo(cycles = NodeCycles.CYCLES_2, size = SIZE_1) 47 public final class MonitorCounterNode extends FloatingNode implements LIRLowerable, Node.ValueNumberable { 48 public static final NodeClass<MonitorCounterNode> TYPE = NodeClass.create(MonitorCounterNode.class); 49 50 public MonitorCounterNode(@InjectedNodeParameter WordTypes wordTypes) { 51 super(TYPE, StampFactory.forKind(wordTypes.getWordKind())); 52 } 53 54 @Override 55 public void generate(NodeLIRBuilderTool gen) { 56 assert graph().getNodes().filter(MonitorCounterNode.class).count() == 1 : "monitor counters not canonicalized to single instance"; 57 VirtualStackSlot counter = gen.getLIRGeneratorTool().getResult().getFrameMapBuilder().allocateStackSlots(1); 58 Value result = gen.getLIRGeneratorTool().emitAddress(counter); 59 gen.setResult(this, result); 60 } 61 62 @NodeIntrinsic 63 public static native Word counter(); 64 }