| /* |
| * 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<PiNode> TYPE = NodeClass.create(PiNode.class); |
| @Input ValueNode object; |
| protected final Stamp piStamp; |
| |
| public ValueNode object() { |
| return object; |
| } |
| |
| protected PiNode(NodeClass<? extends PiNode> 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); |
| } |
