Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/LoadFieldNode.java @ 15139:220dd370ef9b
Some simplifications around filter usages and node predicates
author | Gilles Duboscq <duboscq@ssw.jku.at> |
---|---|
date | Fri, 11 Apr 2014 19:00:42 +0200 |
parents | e302df8bf51c |
children | 2c0cfbf454b5 |
line wrap: on
line source
/* * Copyright (c) 2009, 2011, 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.java; import static com.oracle.graal.graph.iterators.NodePredicates.*; import java.lang.reflect.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.virtual.*; /** * The {@code LoadFieldNode} represents a read of a static or instance field. */ @NodeInfo(nameTemplate = "LoadField#{p#field/s}") public final class LoadFieldNode extends AccessFieldNode implements Canonicalizable, VirtualizableRoot { /** * Creates a new LoadFieldNode instance. * * @param object the receiver object * @param field the compiler interface field */ public LoadFieldNode(ValueNode object, ResolvedJavaField field) { super(createStamp(field), object, field); } private static Stamp createStamp(ResolvedJavaField field) { Kind kind = field.getKind(); if (kind == Kind.Object && field.getType() instanceof ResolvedJavaType) { return StampFactory.declared((ResolvedJavaType) field.getType()); } else { return StampFactory.forKind(kind); } } @Override public Node canonical(CanonicalizerTool tool) { if (usages().isEmpty() && !isVolatile() && (isStatic() || ObjectStamp.isObjectNonNull(object().stamp()))) { return null; } MetaAccessProvider metaAccess = tool.getMetaAccess(); if (tool.canonicalizeReads() && metaAccess != null) { ConstantNode constant = asConstant(metaAccess); if (constant != null) { return constant; } PhiNode phi = asPhi(metaAccess); if (phi != null) { return phi; } } if (!isStatic() && object().isNullConstant()) { return graph().add(new DeoptimizeNode(DeoptimizationAction.None, DeoptimizationReason.NullCheckException)); } return this; } /** * Gets a constant value for this load if possible. */ public ConstantNode asConstant(MetaAccessProvider metaAccess) { Constant constant = null; if (isStatic()) { constant = field().readConstantValue(null); } else if (object().isConstant() && !object().isNullConstant()) { constant = field().readConstantValue(object().asConstant()); } if (constant != null) { return ConstantNode.forConstant(constant, metaAccess, graph()); } return null; } private PhiNode asPhi(MetaAccessProvider metaAccess) { if (!isStatic() && Modifier.isFinal(field.getModifiers()) && object() instanceof ValuePhiNode && ((ValuePhiNode) object()).values().filter(isNotA(ConstantNode.class)).isEmpty()) { PhiNode phi = (PhiNode) object(); Constant[] constants = new Constant[phi.valueCount()]; for (int i = 0; i < phi.valueCount(); i++) { Constant constantValue = field().readConstantValue(phi.valueAt(i).asConstant()); if (constantValue == null) { return null; } constants[i] = constantValue; } PhiNode newPhi = graph().addWithoutUnique(new ValuePhiNode(stamp(), phi.merge())); for (int i = 0; i < phi.valueCount(); i++) { newPhi.addInput(ConstantNode.forConstant(constants[i], metaAccess, graph())); } return newPhi; } return null; } @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(object()); if (state != null && state.getState() == EscapeState.Virtual) { int fieldIndex = ((VirtualInstanceNode) state.getVirtualObject()).fieldIndex(field()); if (fieldIndex != -1) { tool.replaceWith(state.getEntry(fieldIndex)); } } } }