Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/PiNode.java @ 22790:615f3bbbb174
Update jvmci and truffle import: Rename jdk.internal.jvmci to jdk.vm.ci
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 08 Oct 2015 17:41:33 -0700 |
parents | 05183a084a08 |
children | 4e72c50bb9c1 |
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/* * Copyright (c) 2012, 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; //JaCoCo Exclude import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.ResolvedJavaType; import com.oracle.graal.compiler.common.type.Stamp; import com.oracle.graal.compiler.common.type.StampFactory; import com.oracle.graal.graph.IterableNodeType; import com.oracle.graal.graph.Node; import com.oracle.graal.graph.NodeClass; import com.oracle.graal.graph.spi.Canonicalizable; import com.oracle.graal.graph.spi.CanonicalizerTool; import com.oracle.graal.nodeinfo.NodeInfo; import com.oracle.graal.nodes.extended.GuardingNode; import com.oracle.graal.nodes.spi.LIRLowerable; import com.oracle.graal.nodes.spi.NodeLIRBuilderTool; import com.oracle.graal.nodes.spi.ValueProxy; import com.oracle.graal.nodes.spi.Virtualizable; import com.oracle.graal.nodes.spi.VirtualizerTool; import com.oracle.graal.nodes.type.StampTool; import com.oracle.graal.nodes.virtual.VirtualObjectNode; /** * 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 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) { super(c, stamp, null); this.object = object; this.piStamp = stamp; } public PiNode(ValueNode object, Stamp stamp) { this(object, stamp, null); } public PiNode(ValueNode object, Stamp stamp, ValueNode anchor) { super(TYPE, stamp, (GuardingNode) anchor); this.object = object; this.piStamp = stamp; } public PiNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull) { this(object, StampFactory.object(toType, exactType, nonNull || StampTool.isPointerNonNull(object.stamp()), true)); } @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() { if (piStamp == StampFactory.forNodeIntrinsic()) { return false; } return updateStamp(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; } inferStamp(); if (stamp().equals(object().stamp())) { return object(); } if (getGuard() != null) { for (PiNode otherPi : getGuard().asNode().usages().filter(PiNode.class)) { if (object() == otherPi.object() && stamp().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); } @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 float above a given * anchor. */ @NodeIntrinsic public static native Object piCast(Object object, @ConstantNodeParameter Stamp stamp, 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); }