--- /dev/null 2016-05-31 09:42:47.975716356 -0700 +++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/PiNode.java 2016-12-09 00:55:06.907194102 -0800 @@ -0,0 +1,229 @@ +/* + * Copyright (c) 2012, 2016, 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.nodes; + +import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; +import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; + +import org.graalvm.compiler.core.common.type.Stamp; +import org.graalvm.compiler.core.common.type.StampFactory; +import org.graalvm.compiler.core.common.type.TypeReference; +import org.graalvm.compiler.graph.IterableNodeType; +import org.graalvm.compiler.graph.Node; +import org.graalvm.compiler.graph.NodeClass; +import org.graalvm.compiler.graph.spi.Canonicalizable; +import org.graalvm.compiler.graph.spi.CanonicalizerTool; +import org.graalvm.compiler.nodeinfo.NodeInfo; +import org.graalvm.compiler.nodes.extended.GuardingNode; +import org.graalvm.compiler.nodes.extended.UnsafeLoadNode; +import org.graalvm.compiler.nodes.java.LoadFieldNode; +import org.graalvm.compiler.nodes.spi.LIRLowerable; +import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; +import org.graalvm.compiler.nodes.spi.ValueProxy; +import org.graalvm.compiler.nodes.spi.Virtualizable; +import org.graalvm.compiler.nodes.spi.VirtualizerTool; +import org.graalvm.compiler.nodes.type.StampTool; +import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; + +//JaCoCo Exclude + +import jdk.vm.ci.meta.JavaKind; +import jdk.vm.ci.meta.ResolvedJavaType; + +/** + * A node that changes the type of its input, usually narrowing it. For example, a {@link PiNode} + * refines the type of a receiver during type-guarded inlining to be the type tested by the guard. + * + * In contrast to a {@link GuardedValueNode}, a {@link PiNode} is useless as soon as the type of its + * input is as narrow or narrower than the {@link PiNode}'s type. The {@link PiNode}, and therefore + * also the scheduling restriction enforced by the anchor, will go away. + */ +@NodeInfo(cycles = CYCLES_0, size = SIZE_0) +public class PiNode extends FloatingGuardedNode implements LIRLowerable, Virtualizable, IterableNodeType, Canonicalizable, ValueProxy { + + public static final NodeClass TYPE = NodeClass.create(PiNode.class); + @Input ValueNode object; + protected final Stamp piStamp; + + public ValueNode object() { + return object; + } + + protected PiNode(NodeClass c, ValueNode object, Stamp stamp, GuardingNode guard) { + super(c, stamp, guard); + this.object = object; + this.piStamp = stamp; + inferStamp(); + } + + public PiNode(ValueNode object, Stamp stamp) { + this(object, stamp, null); + } + + public PiNode(ValueNode object, Stamp stamp, ValueNode anchor) { + this(TYPE, object, stamp, (GuardingNode) anchor); + } + + public PiNode(ValueNode object, ValueNode anchor) { + this(object, object.stamp().join(StampFactory.objectNonNull()), anchor); + } + + public PiNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull) { + this(object, StampFactory.object(exactType ? TypeReference.createExactTrusted(toType) : TypeReference.createWithoutAssumptions(toType), nonNull || StampTool.isPointerNonNull(object.stamp()))); + } + + @Override + public void generate(NodeLIRBuilderTool generator) { + if (object.getStackKind() != JavaKind.Void && object.getStackKind() != JavaKind.Illegal) { + generator.setResult(this, generator.operand(object)); + } + } + + @Override + public boolean inferStamp() { + return updateStamp(computeStamp()); + } + + private Stamp computeStamp() { + // When piStamp == StampFactory.forNodeIntrinsic() then stamp is either + // StampFactory.forNodeIntrinsic() or it has been updated during snippet + // lowering to be the stamp of the node being replaced by the snippet. + if (piStamp == StampFactory.forNodeIntrinsic()) { + return stamp; + } + return piStamp.improveWith(object().stamp()); + } + + @Override + public void virtualize(VirtualizerTool tool) { + ValueNode alias = tool.getAlias(object()); + if (alias instanceof VirtualObjectNode) { + VirtualObjectNode virtual = (VirtualObjectNode) alias; + if (StampTool.typeOrNull(this) != null && StampTool.typeOrNull(this).isAssignableFrom(virtual.type())) { + tool.replaceWithVirtual(virtual); + } + } + } + + @Override + public Node canonical(CanonicalizerTool tool) { + if (stamp() == StampFactory.forNodeIntrinsic()) { + /* The actual stamp has not been set yet. */ + return this; + } + // Use most up to date stamp. + Stamp computedStamp = computeStamp(); + + ValueNode o = object(); + + // The pi node does not give any additional information => skip it. + if (computedStamp.equals(o.stamp())) { + return o; + } + + GuardingNode g = getGuard(); + if (g == null) { + + // Try to merge the pi node with a load node. + if (o instanceof LoadFieldNode) { + LoadFieldNode loadFieldNode = (LoadFieldNode) o; + loadFieldNode.setStamp(loadFieldNode.stamp().improveWith(this.piStamp)); + return loadFieldNode; + } else if (o instanceof UnsafeLoadNode) { + UnsafeLoadNode unsafeLoadNode = (UnsafeLoadNode) o; + unsafeLoadNode.setStamp(unsafeLoadNode.stamp().improveWith(this.piStamp)); + return unsafeLoadNode; + } + } else { + for (Node n : g.asNode().usages()) { + if (n instanceof PiNode) { + PiNode otherPi = (PiNode) n; + if (o == otherPi.object() && computedStamp.equals(otherPi.stamp())) { + /* + * Two PiNodes with the same guard and same result, so return the one with + * the more precise piStamp. + */ + Stamp newStamp = piStamp.join(otherPi.piStamp); + if (newStamp.equals(otherPi.piStamp)) { + return otherPi; + } + } + } + } + } + return this; + } + + @Override + public ValueNode getOriginalNode() { + return object; + } + + /** + * Casts an object to have an exact, non-null stamp representing {@link Class}. + */ + public static Class asNonNullClass(Object object) { + return asNonNullClassIntrinsic(object, Class.class, true, true); + } + + /** + * Casts an object to have an exact, non-null stamp representing {@link Class}. + */ + public static Class asNonNullObject(Object object) { + return asNonNullClassIntrinsic(object, Object.class, false, true); + } + + @NodeIntrinsic(PiNode.class) + private static native Class asNonNullClassIntrinsic(Object object, @ConstantNodeParameter Class toType, @ConstantNodeParameter boolean exactType, @ConstantNodeParameter boolean nonNull); + + /** + * Changes the stamp of an object. + */ + @NodeIntrinsic + public static native Object piCast(Object object, @ConstantNodeParameter Stamp stamp); + + /** + * Changes the stamp of an object and ensures the newly stamped value does not float above a + * given anchor. + */ + @NodeIntrinsic + public static native Object piCast(Object object, @ConstantNodeParameter Stamp stamp, GuardingNode anchor); + + /** + * Changes the stamp of an object and ensures the newly stamped value is non-null and does not + * float above a given anchor. + */ + @NodeIntrinsic + public static native Object piCastNonNull(Object object, GuardingNode anchor); + + /** + * Changes the stamp of an object to represent a given type and to indicate that the object is + * not null. + */ + public static Object piCastNonNull(Object object, @ConstantNodeParameter Class toType) { + return piCast(object, toType, false, true); + } + + @NodeIntrinsic + public static native Object piCast(Object object, @ConstantNodeParameter Class toType, @ConstantNodeParameter boolean exactType, @ConstantNodeParameter boolean nonNull); +}