1 /* 2 * Copyright (c) 2011, 2015, 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 package org.graalvm.compiler.nodes; 24 25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_UNKNOWN; 26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_6; 27 28 import org.graalvm.compiler.core.common.type.StampFactory; 29 import org.graalvm.compiler.graph.NodeClass; 30 import org.graalvm.compiler.nodeinfo.NodeInfo; 31 import org.graalvm.compiler.nodes.spi.LIRLowerable; 32 import org.graalvm.compiler.nodes.spi.Lowerable; 33 import org.graalvm.compiler.nodes.spi.LoweringTool; 34 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 35 36 /** 37 * Marks a position in the graph where a safepoint should be emitted. 38 */ 39 // @formatter:off 40 @NodeInfo(cycles = CYCLES_UNKNOWN, 41 cyclesRationale = "We don't know how long a safepoint would take if it is executed", 42 size = SIZE_6) 43 // @formatter:on 44 public final class SafepointNode extends DeoptimizingFixedWithNextNode implements Lowerable, LIRLowerable { 45 46 public static final NodeClass<SafepointNode> TYPE = NodeClass.create(SafepointNode.class); 47 48 public SafepointNode() { 49 super(TYPE, StampFactory.forVoid()); 50 } 51 52 @Override 53 public void lower(LoweringTool tool) { 54 tool.getLowerer().lower(this, tool); 55 } 56 57 @Override 58 public void generate(NodeLIRBuilderTool gen) { 59 gen.visitSafepointNode(this); 60 } 61 62 @Override 63 public boolean canDeoptimize() { 64 return true; 65 } 66 }