/*
 * Copyright (c) 2012, 2018, 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 org.graalvm.compiler.core.common.type.StampFactory;
import org.graalvm.compiler.graph.NodeClass;
import org.graalvm.compiler.hotspot.HotSpotLIRGenerator;
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;

Intrinsic for getting the lock in the current lock scope.
/** * Intrinsic for getting the lock in the current {@linkplain BeginLockScopeNode lock scope}. */
@NodeInfo(cycles = CYCLES_2, size = SIZE_1) public final class CurrentLockNode extends FixedWithNextNode implements LIRLowerable { public static final NodeClass<CurrentLockNode> TYPE = NodeClass.create(CurrentLockNode.class); protected int lockDepth; public CurrentLockNode(@InjectedNodeParameter WordTypes wordTypes, int lockDepth) { super(TYPE, StampFactory.forKind(wordTypes.getWordKind())); this.lockDepth = lockDepth; } @Override public void generate(NodeLIRBuilderTool gen) { assert lockDepth != -1; HotSpotLIRGenerator hsGen = (HotSpotLIRGenerator) gen.getLIRGeneratorTool(); VirtualStackSlot slot = hsGen.getLockSlot(lockDepth); // The register allocator cannot handle stack -> register moves so we use an LEA here Value result = gen.getLIRGeneratorTool().emitAddress(slot); gen.setResult(this, result); } @NodeIntrinsic public static native Word currentLock(@ConstantNodeParameter int lockDepth); }