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 }