1 /*
   2  * Copyright (c) 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package org.graalvm.compiler.hotspot.nodes;
  26 
  27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_1;
  28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  29 
  30 import org.graalvm.compiler.core.common.LIRKind;
  31 import org.graalvm.compiler.core.common.type.StampFactory;
  32 import org.graalvm.compiler.graph.NodeClass;
  33 import org.graalvm.compiler.hotspot.HotSpotLIRGenerator;
  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.code.Register;
  42 import jdk.vm.ci.meta.JavaKind;
  43 import jdk.vm.ci.meta.PlatformKind;
  44 
  45 /**
  46  * Gets the address of the C++ JavaThread object for the current thread.
  47  */
  48 @NodeInfo(cycles = CYCLES_1, size = SIZE_1)
  49 public final class CurrentStackPointerNode extends FloatingNode implements LIRLowerable {
  50     public static final NodeClass<CurrentStackPointerNode> TYPE = NodeClass.create(CurrentStackPointerNode.class);
  51 
  52     public CurrentStackPointerNode(@InjectedNodeParameter WordTypes wordTypes) {
  53         this(wordTypes.getWordKind());
  54     }
  55 
  56     public CurrentStackPointerNode(JavaKind wordKind) {
  57         super(TYPE, StampFactory.forKind(wordKind));
  58     }
  59 
  60     @Override
  61     public void generate(NodeLIRBuilderTool gen) {
  62         Register rawStackPointer = ((HotSpotLIRGenerator) gen.getLIRGeneratorTool()).getProviders().getRegisters().getStackPointerRegister();
  63         PlatformKind wordKind = gen.getLIRGeneratorTool().target().arch.getWordKind();
  64         gen.setResult(this, rawStackPointer.asValue(LIRKind.value(wordKind)));
  65     }
  66 
  67     @NodeIntrinsic
  68     public static native Word get();
  69 }