Mercurial > hg > truffle

changeset 20041:01290be48def

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Merge.
author Doug Simon <doug.simon@oracle.com>
date Thu, 26 Mar 2015 17:06:40 +0100
parents f137f1974f60 (current diff) 66dbc66d5609 (diff)
children b2e8b26f5040
files graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/DefaultGenericInvocationPlugin.java graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/MemoryAnchorNode.java
diffstat 8 files changed, 401 insertions(+), 55 deletions(-) [+]
line wrap: on
line diff
--- a/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotGraphBuilderPlugins.java	Thu Mar 26 17:06:08 2015 +0100
+++ b/graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/meta/HotSpotGraphBuilderPlugins.java	Thu Mar 26 17:06:40 2015 +0100
@@ -70,7 +70,7 @@
         plugins.setLoadFieldPlugin(new HotSpotLoadFieldPlugin(metaAccess, constantReflection));
         plugins.setLoadIndexedPlugin(new HotSpotLoadIndexedPlugin(wordTypes));
         plugins.setInlineInvokePlugin(new DefaultInlineInvokePlugin(replacements));
-        plugins.setGenericInvocationPlugin(new DefaultGenericInvocationPlugin(nodeIntrinsification, wordOperationPlugin));
+        plugins.setGenericInvocationPlugin(new DefaultGenericInvocationPlugin(metaAccess, nodeIntrinsification, wordOperationPlugin));
 
         registerObjectPlugins(invocationPlugins);
         registerSystemPlugins(invocationPlugins, foreignCalls);
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.nodeinfo/src/com/oracle/graal/nodeinfo/StructuralInput.java	Thu Mar 26 17:06:40 2015 +0100
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2015, 2015, 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 com.oracle.graal.nodeinfo;
+
+import java.lang.annotation.*;
+
+/**
+ * Marker type for describing node inputs in snippets that are not of type {@link InputType#Value}.
+ */
+public abstract class StructuralInput {
+
+    private StructuralInput() {
+        throw new Error("Illegal instance of StructuralInput. This class should be used in snippets only.");
+    }
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.TYPE)
+    public @interface MarkerType {
+        InputType value();
+    }
+
+    /**
+     * Marker type for {@link InputType#Memory} edges in snippets.
+     */
+    @MarkerType(InputType.Memory)
+    public abstract static class Memory extends StructuralInput {
+    }
+
+    /**
+     * Marker type for {@link InputType#Condition} edges in snippets.
+     */
+    @MarkerType(InputType.Condition)
+    public abstract static class Condition extends StructuralInput {
+    }
+
+    /**
+     * Marker type for {@link InputType#State} edges in snippets.
+     */
+    @MarkerType(InputType.State)
+    public abstract static class State extends StructuralInput {
+    }
+
+    /**
+     * Marker type for {@link InputType#Guard} edges in snippets.
+     */
+    @MarkerType(InputType.Guard)
+    public abstract static class Guard extends StructuralInput {
+    }
+
+    /**
+     * Marker type for {@link InputType#Anchor} edges in snippets.
+     */
+    @MarkerType(InputType.Anchor)
+    public abstract static class Anchor extends StructuralInput {
+    }
+
+    /**
+     * Marker type for {@link InputType#Association} edges in snippets.
+     */
+    @MarkerType(InputType.Association)
+    public abstract static class Association extends StructuralInput {
+    }
+
+    /**
+     * Marker type for {@link InputType#Extension} edges in snippets.
+     */
+    @MarkerType(InputType.Extension)
+    public abstract static class Extension extends StructuralInput {
+    }
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/MemoryAnchorNode.java	Thu Mar 26 17:06:40 2015 +0100
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2014, 2015, 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 com.oracle.graal.nodes.extended;
+
+import com.oracle.graal.compiler.common.type.*;
+import com.oracle.graal.graph.*;
+import com.oracle.graal.graph.spi.*;
+import com.oracle.graal.nodeinfo.*;
+import com.oracle.graal.nodeinfo.StructuralInput.Memory;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.spi.*;
+
+@NodeInfo(allowedUsageTypes = {InputType.Memory})
+public final class MemoryAnchorNode extends FixedWithNextNode implements LIRLowerable, MemoryNode, Canonicalizable {
+
+    public static final NodeClass<MemoryAnchorNode> TYPE = NodeClass.create(MemoryAnchorNode.class);
+
+    public MemoryAnchorNode() {
+        super(TYPE, StampFactory.forVoid());
+    }
+
+    public void generate(NodeLIRBuilderTool generator) {
+        // Nothing to emit, since this node is used for structural purposes only.
+    }
+
+    @Override
+    public Node canonical(CanonicalizerTool tool) {
+        return hasNoUsages() ? null : this;
+    }
+
+    @NodeIntrinsic
+    public static native Memory anchor();
+}
--- a/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/FloatingReadPhase.java	Thu Mar 26 17:06:08 2015 +0100
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/FloatingReadPhase.java	Thu Mar 26 17:06:40 2015 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2011, 2015, 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
@@ -255,6 +255,11 @@
 
         @Override
         protected MemoryMapImpl processNode(FixedNode node, MemoryMapImpl state) {
+            if (node instanceof MemoryAnchorNode) {
+                processAnchor((MemoryAnchorNode) node, state);
+                return state;
+            }
+
             if (node instanceof MemoryAccess) {
                 processAccess((MemoryAccess) node, state);
             }
@@ -274,6 +279,28 @@
             return state;
         }
 
+        /**
+         * Improve the memory graph by re-wiring all usages of a {@link MemoryAnchorNode} to the
+         * real last access location.
+         */
+        private static void processAnchor(MemoryAnchorNode anchor, MemoryMapImpl state) {
+            for (Node node : anchor.usages().snapshot()) {
+                if (node instanceof MemoryAccess) {
+                    MemoryAccess access = (MemoryAccess) node;
+                    if (access.getLastLocationAccess() == anchor) {
+                        MemoryNode lastLocationAccess = state.getLastLocationAccess(access.getLocationIdentity());
+                        if (lastLocationAccess != null) {
+                            access.setLastLocationAccess(lastLocationAccess);
+                        }
+                    }
+                }
+            }
+
+            if (anchor.hasNoUsages()) {
+                anchor.graph().removeFixed(anchor);
+            }
+        }
+
         private static void processAccess(MemoryAccess access, MemoryMapImpl state) {
             LocationIdentity locationIdentity = access.getLocationIdentity();
             if (!locationIdentity.equals(LocationIdentity.any())) {
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.replacements.test/src/com/oracle/graal/replacements/test/SubstitutionsTest.java	Thu Mar 26 17:06:40 2015 +0100
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2015, 2015, 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 com.oracle.graal.replacements.test;
+
+import static com.oracle.graal.nodeinfo.InputType.*;
+import static org.hamcrest.CoreMatchers.*;
+
+import org.junit.*;
+
+import com.oracle.graal.api.meta.*;
+import com.oracle.graal.api.replacements.*;
+import com.oracle.graal.compiler.common.type.*;
+import com.oracle.graal.compiler.test.*;
+import com.oracle.graal.graph.*;
+import com.oracle.graal.graph.iterators.*;
+import com.oracle.graal.nodeinfo.*;
+import com.oracle.graal.nodeinfo.StructuralInput.Guard;
+import com.oracle.graal.nodeinfo.StructuralInput.Memory;
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.calc.*;
+import com.oracle.graal.nodes.extended.*;
+
+public class SubstitutionsTest extends GraalCompilerTest {
+
+    @NodeInfo(allowedUsageTypes = {Memory})
+    private static class TestMemory extends FixedWithNextNode implements MemoryNode {
+        private static final NodeClass<TestMemory> TYPE = NodeClass.create(TestMemory.class);
+
+        public TestMemory() {
+            super(TYPE, StampFactory.forVoid());
+        }
+
+        @NodeIntrinsic
+        public static native Memory memory();
+    }
+
+    @NodeInfo(allowedUsageTypes = {Guard})
+    private static class TestGuard extends FloatingNode implements GuardingNode {
+        private static final NodeClass<TestGuard> TYPE = NodeClass.create(TestGuard.class);
+
+        @Input(Memory) MemoryNode memory;
+
+        public TestGuard(ValueNode memory) {
+            super(TYPE, StampFactory.forVoid());
+            this.memory = (MemoryNode) memory;
+        }
+
+        @NodeIntrinsic
+        public static native Guard guard(Memory memory);
+    }
+
+    @NodeInfo
+    private static class TestValue extends FloatingNode {
+        private static final NodeClass<TestValue> TYPE = NodeClass.create(TestValue.class);
+
+        @Input(Guard) GuardingNode guard;
+
+        public TestValue(ValueNode guard) {
+            super(TYPE, StampFactory.forKind(Kind.Int));
+            this.guard = (GuardingNode) guard;
+        }
+
+        @NodeIntrinsic
+        public static native int value(Guard guard);
+    }
+
+    private static class TestMethod {
+
+        public static int test() {
+            return 42;
+        }
+    }
+
+    @ClassSubstitution(TestMethod.class)
+    private static class TestMethodSubstitution {
+
+        @MethodSubstitution
+        public static int test() {
+            Memory memory = TestMemory.memory();
+            Guard guard = TestGuard.guard(memory);
+            return TestValue.value(guard);
+        }
+    }
+
+    private static boolean substitutionsInstalled;
+
+    public SubstitutionsTest() {
+        if (!substitutionsInstalled) {
+            getProviders().getReplacements().registerSubstitutions(TestMethod.class, TestMethodSubstitution.class);
+            substitutionsInstalled = true;
+        }
+    }
+
+    public static int callTest() {
+        return TestMethod.test();
+    }
+
+    @Override
+    protected boolean checkHighTierGraph(StructuredGraph graph) {
+        // Check that the graph contains the expected test nodes.
+        NodeIterable<ReturnNode> retNodes = graph.getNodes().filter(ReturnNode.class);
+        Assert.assertTrue("expected exactly one ReturnNode", retNodes.count() == 1);
+        ReturnNode ret = retNodes.first();
+
+        Assert.assertThat(ret.result(), instanceOf(TestValue.class));
+        TestValue value = (TestValue) ret.result();
+
+        Assert.assertThat(value.guard, instanceOf(TestGuard.class));
+        TestGuard guard = (TestGuard) value.guard;
+
+        Assert.assertThat(guard.memory, instanceOf(TestMemory.class));
+        TestMemory memory = (TestMemory) guard.memory;
+
+        // Remove the test nodes, replacing them by the constant 42.
+        // This implicitly makes sure that the rest of the graph is valid.
+        ret.replaceFirstInput(value, graph.unique(ConstantNode.forInt(42)));
+        value.safeDelete();
+        guard.safeDelete();
+        graph.removeFixed(memory);
+
+        return true;
+    }
+
+    @Test
+    public void snippetTest() {
+        test("callTest");
+    }
+}
--- a/graal/com.oracle.graal.replacements.verifier/src/com/oracle/graal/replacements/verifier/NodeIntrinsicVerifier.java	Thu Mar 26 17:06:08 2015 +0100
+++ b/graal/com.oracle.graal.replacements.verifier/src/com/oracle/graal/replacements/verifier/NodeIntrinsicVerifier.java	Thu Mar 26 17:06:40 2015 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2015, 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
@@ -34,6 +34,8 @@
 import com.oracle.graal.graph.Node.ConstantNodeParameter;
 import com.oracle.graal.graph.Node.InjectedNodeParameter;
 import com.oracle.graal.graph.Node.NodeIntrinsic;
+import com.oracle.graal.nodeinfo.*;
+import com.oracle.graal.nodeinfo.StructuralInput.MarkerType;
 
 public final class NodeIntrinsicVerifier extends AbstractVerifier {
 
@@ -55,6 +57,10 @@
         return env.getElementUtils().getTypeElement("com.oracle.graal.api.meta.ResolvedJavaType").asType();
     }
 
+    private TypeMirror structuralInputType() {
+        return env.getElementUtils().getTypeElement("com.oracle.graal.nodeinfo.StructuralInput").asType();
+    }
+
     public NodeIntrinsicVerifier(ProcessingEnvironment env) {
         super(env);
     }
@@ -100,6 +106,11 @@
             if (nodeClass.getModifiers().contains(Modifier.ABSTRACT)) {
                 env.getMessager().printMessage(Kind.ERROR, String.format("Cannot make @NodeIntrinsic for abstract node class %s.", nodeClass.getSimpleName()), element, annotation);
             } else {
+                TypeMirror ret = intrinsicMethod.getReturnType();
+                if (env.getTypeUtils().isAssignable(ret, structuralInputType())) {
+                    checkInputType(nodeClass, ret, element, annotation);
+                }
+
                 TypeMirror[] constructorSignature = constructorSignature(intrinsicMethod);
                 findConstructor(nodeClass, constructorSignature, intrinsicMethod, annotation);
             }
@@ -108,6 +119,39 @@
         }
     }
 
+    private void checkInputType(TypeElement nodeClass, TypeMirror returnType, Element element, AnnotationMirror annotation) {
+        InputType inputType = getInputType(returnType, element, annotation);
+        if (inputType != InputType.Value) {
+            boolean allowed = false;
+            InputType[] allowedTypes = nodeClass.getAnnotation(NodeInfo.class).allowedUsageTypes();
+            for (InputType allowedType : allowedTypes) {
+                if (inputType == allowedType) {
+                    allowed = true;
+                    break;
+                }
+            }
+            if (!allowed) {
+                env.getMessager().printMessage(Kind.ERROR, String.format("@NodeIntrinsic returns input type %s, but only %s is allowed.", inputType, Arrays.toString(allowedTypes)), element,
+                                annotation);
+            }
+        }
+    }
+
+    private InputType getInputType(TypeMirror type, Element element, AnnotationMirror annotation) {
+        TypeElement current = (TypeElement) env.getTypeUtils().asElement(type);
+        while (current != null) {
+            MarkerType markerType = current.getAnnotation(MarkerType.class);
+            if (markerType != null) {
+                return markerType.value();
+            }
+
+            current = (TypeElement) env.getTypeUtils().asElement(current.getSuperclass());
+        }
+
+        env.getMessager().printMessage(Kind.ERROR, String.format("The class %s is a subclass of StructuralInput, but isn't annotated with @MarkerType.", type), element, annotation);
+        return InputType.Value;
+    }
+
     private boolean isNodeType(TypeElement nodeClass) {
         return env.getTypeUtils().isSubtype(nodeClass.asType(), nodeType());
     }
--- a/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/DefaultGenericInvocationPlugin.java	Thu Mar 26 17:06:08 2015 +0100
+++ b/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/DefaultGenericInvocationPlugin.java	Thu Mar 26 17:06:40 2015 +0100
@@ -29,9 +29,12 @@
 
 import com.oracle.graal.api.meta.*;
 import com.oracle.graal.api.replacements.*;
+import com.oracle.graal.compiler.common.*;
 import com.oracle.graal.compiler.common.type.*;
 import com.oracle.graal.graph.Node.NodeIntrinsic;
 import com.oracle.graal.graphbuilderconf.*;
+import com.oracle.graal.nodeinfo.*;
+import com.oracle.graal.nodeinfo.StructuralInput.MarkerType;
 import com.oracle.graal.nodes.*;
 import com.oracle.graal.nodes.extended.*;
 import com.oracle.graal.word.*;
@@ -44,9 +47,13 @@
     protected final NodeIntrinsificationPhase nodeIntrinsification;
     protected final WordOperationPlugin wordOperationPlugin;
 
-    public DefaultGenericInvocationPlugin(NodeIntrinsificationPhase nodeIntrinsification, WordOperationPlugin wordOperationPlugin) {
+    private final ResolvedJavaType structuralInputType;
+
+    public DefaultGenericInvocationPlugin(MetaAccessProvider metaAccess, NodeIntrinsificationPhase nodeIntrinsification, WordOperationPlugin wordOperationPlugin) {
         this.nodeIntrinsification = nodeIntrinsification;
         this.wordOperationPlugin = wordOperationPlugin;
+
+        this.structuralInputType = metaAccess.lookupJavaType(StructuralInput.class);
     }
 
     public boolean apply(GraphBuilderContext b, ResolvedJavaMethod method, ValueNode[] args) {
@@ -91,6 +98,24 @@
         return false;
     }
 
+    private InputType getInputType(ObjectStamp stamp) {
+        ResolvedJavaType type = stamp.type();
+        if (type != null && structuralInputType.isAssignableFrom(type)) {
+            while (type != null) {
+                MarkerType markerType = type.getAnnotation(MarkerType.class);
+                if (markerType != null) {
+                    return markerType.value();
+                }
+
+                type = type.getSuperclass();
+            }
+
+            throw GraalInternalError.shouldNotReachHere(String.format("%s extends StructuralInput, but is not annotated with @MarkerType", stamp.type()));
+        } else {
+            return InputType.Value;
+        }
+    }
+
     protected boolean processNodeIntrinsic(GraphBuilderContext b, ResolvedJavaMethod method, NodeIntrinsic intrinsic, List<ValueNode> args, Kind returnKind, Stamp stamp) {
         ValueNode res = createNodeIntrinsic(b, method, intrinsic, args, stamp);
         if (res == null) {
@@ -107,7 +132,16 @@
         }
 
         res = b.append(res);
-        if (returnKind != Kind.Void) {
+
+        InputType inputType = InputType.Value;
+        if (returnKind == Kind.Object && stamp instanceof ObjectStamp) {
+            inputType = getInputType((ObjectStamp) stamp);
+        }
+
+        if (inputType != InputType.Value) {
+            assert res.isAllowedUsageType(inputType);
+            b.push(Kind.Object, res);
+        } else if (returnKind != Kind.Void) {
             assert res.getKind().getStackKind() != Kind.Void;
             b.push(returnKind.getStackKind(), res);
         } else {
--- a/graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/MemoryAnchorNode.java	Thu Mar 26 17:06:08 2015 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,50 +0,0 @@
-/*
- * Copyright (c) 2014, 2015, 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 com.oracle.graal.replacements.nodes;
-
-import com.oracle.graal.compiler.common.type.*;
-import com.oracle.graal.graph.*;
-import com.oracle.graal.graph.spi.*;
-import com.oracle.graal.nodeinfo.*;
-import com.oracle.graal.nodes.*;
-import com.oracle.graal.nodes.extended.*;
-import com.oracle.graal.nodes.spi.*;
-
-@NodeInfo(allowedUsageTypes = {InputType.Memory})
-public final class MemoryAnchorNode extends FixedWithNextNode implements LIRLowerable, MemoryNode, Canonicalizable {
-
-    public static final NodeClass<MemoryAnchorNode> TYPE = NodeClass.create(MemoryAnchorNode.class);
-
-    public MemoryAnchorNode() {
-        super(TYPE, StampFactory.forVoid());
-    }
-
-    public void generate(NodeLIRBuilderTool generator) {
-        // Nothing to emit, since this node is used for structural purposes only.
-    }
-
-    @Override
-    public Node canonical(CanonicalizerTool tool) {
-        return hasNoUsages() ? null : this;
-    }
-}