Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/CheckCastNode.java @ 6710:6db6881c1270
add Virtualizable and VirtualizerTool, refactor PEA to use it
author | Lukas Stadler <lukas.stadler@jku.at> |
---|---|
date | Mon, 12 Nov 2012 17:49:06 +0100 |
parents | 7bf5a6c42db7 |
children | dd81042f4eb1 |
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 com.oracle.graal.api.meta.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.nodes.virtual.*; /** * Implements a type check against a compile-time known type. */ public final class CheckCastNode extends FixedWithNextNode implements Canonicalizable, Lowerable, Node.IterableNodeType, Virtualizable { @Input private ValueNode object; private final ResolvedJavaType type; private final JavaTypeProfile profile; /** * Creates a new CheckCast instruction. * * @param type the type being cast to * @param object the instruction producing the object */ public CheckCastNode(ResolvedJavaType type, ValueNode object, JavaTypeProfile profile) { super(StampFactory.declared(type)); assert type != null; this.type = type; this.object = object; this.profile = profile; } @Override public void lower(LoweringTool tool) { tool.getRuntime().lower(this, tool); } @Override public boolean inferStamp() { if (object().stamp().nonNull() && !stamp().nonNull()) { setStamp(StampFactory.declaredNonNull(type)); return true; } return super.inferStamp(); } @Override public ValueNode canonical(CanonicalizerTool tool) { assert object() != null : this; if (type != null) { ResolvedJavaType objectType = object().objectStamp().type(); if (objectType != null && objectType.isSubtypeOf(type)) { // we don't have to check for null types here because they will also pass the checkcast. return object(); } } if (object().objectStamp().alwaysNull()) { return object(); } return this; } public ValueNode object() { return object; } /** * Gets the type being cast to. */ public ResolvedJavaType type() { return type; } public JavaTypeProfile profile() { return profile; } @Override public void virtualize(VirtualizerTool tool) { VirtualObjectNode virtual = tool.getVirtualState(object()); if (virtual != null && virtual.type().isSubtypeOf(type())) { tool.replaceWithVirtual(virtual); } } }