Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/TypeProfileProxyNode.java @ 12714:655c87d8d3c2
added SnippetPreparationTime metric
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 08 Nov 2013 10:56:23 +0100 |
parents | da9db8331658 |
children | fd7fcd2d2072 |
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/* * Copyright (c) 2013, 2013, 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; import com.oracle.graal.api.meta.*; import com.oracle.graal.debug.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * A node that attaches a type profile to a proxied input node. */ public final class TypeProfileProxyNode extends FloatingNode implements Canonicalizable, IterableNodeType, ValueProxy { @Input private ValueNode object; private final JavaTypeProfile profile; private transient ResolvedJavaType lastCheckedType; private transient JavaTypeProfile lastCheckedProfile; public ValueNode getObject() { return object; } public static ValueNode create(ValueNode object, JavaTypeProfile profile) { if (profile == null) { // No profile, so create no node. return object; } if (profile.getTypes().length == 0) { // Only null profiling is not beneficial enough to keep the node around. return object; } return object.graph().addWithoutUnique(new TypeProfileProxyNode(object, profile)); } private TypeProfileProxyNode(ValueNode object, JavaTypeProfile profile) { super(object.stamp()); this.object = object; this.profile = profile; } public JavaTypeProfile getProfile() { return profile; } @Override public boolean inferStamp() { return updateStamp(object.stamp()); } @Override public Node canonical(CanonicalizerTool tool) { if (ObjectStamp.isExactType(object)) { // The profile is useless - we know the type! return object; } else if (object instanceof TypeProfileProxyNode) { TypeProfileProxyNode other = (TypeProfileProxyNode) object; JavaTypeProfile otherProfile = other.getProfile(); if (otherProfile == lastCheckedProfile) { // We have already incorporated the knowledge about this profile => abort. return this; } lastCheckedProfile = otherProfile; JavaTypeProfile newProfile = this.profile.restrict(otherProfile); if (newProfile.equals(otherProfile)) { // We are useless - just use the other proxy node. Debug.log("Canonicalize with other proxy node."); return object; } if (newProfile != this.profile) { Debug.log("Improved profile via other profile."); return TypeProfileProxyNode.create(object, newProfile); } } else if (ObjectStamp.typeOrNull(object) != null) { ResolvedJavaType type = ObjectStamp.typeOrNull(object); ResolvedJavaType uniqueConcrete = type.findUniqueConcreteSubtype(); if (uniqueConcrete != null) { // Profile is useless => remove. Debug.log("Profile useless, there is enough static type information available."); return object; } if (type == lastCheckedType) { // We have already incorporate the knowledge about this type => abort. return this; } lastCheckedType = type; JavaTypeProfile newProfile = this.profile.restrict(type, ObjectStamp.isObjectNonNull(object)); if (newProfile != this.profile) { Debug.log("Improved profile via static type information."); if (newProfile.getTypes().length == 0) { // Only null profiling is not beneficial enough to keep the node around. return object; } return TypeProfileProxyNode.create(object, newProfile); } } return this; } @Override public ValueNode getOriginalValue() { return object; } }