Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/CheckCastNode.java @ 5379:c862951e769d
moved checkcast lowering into LoweringPhase and added -G:HIRLowerCheckcast option to enable it (disabled by default) as it is not yet stable
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 11 May 2012 12:20:36 +0200 |
parents | 4485e0edd1af |
children | 791eb4f85b29 |
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/* * 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.cri.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.spi.types.*; import com.oracle.graal.nodes.type.*; import com.oracle.max.cri.ci.*; import com.oracle.max.cri.ri.*; /** * Implements a type check that results in a {@link ClassCastException} if it fails. */ public final class CheckCastNode extends FixedWithNextNode implements Canonicalizable, LIRLowerable, Lowerable, Node.IterableNodeType, TypeFeedbackProvider, TypeCanonicalizable { @Input private ValueNode object; @Input private ValueNode targetClassInstruction; private final RiResolvedType targetClass; private final RiTypeProfile profile; /** * Creates a new CheckCast instruction. * @param targetClassInstruction the instruction which produces the class which is being cast to * @param targetClass the class being cast to * @param object the instruction producing the object */ public CheckCastNode(ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object) { this(targetClassInstruction, targetClass, object, null); } public CheckCastNode(ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object, RiTypeProfile profile) { super(targetClass == null ? StampFactory.forKind(CiKind.Object) : StampFactory.declared(targetClass)); this.targetClassInstruction = targetClassInstruction; this.targetClass = targetClass; this.object = object; this.profile = profile; } @Override public void lower(CiLoweringTool tool) { tool.getRuntime().lower(this, tool); } @Override public void generate(LIRGeneratorTool gen) { gen.visitCheckCast(this); } @Override public ValueNode canonical(CanonicalizerTool tool) { assert object() != null : this; RiResolvedType objectDeclaredType = object().declaredType(); if (objectDeclaredType != null && targetClass != null && objectDeclaredType.isSubtypeOf(targetClass)) { // we don't have to check for null types here because they will also pass the checkcast. return object(); } CiConstant constant = object().asConstant(); if (constant != null) { assert constant.kind == CiKind.Object; if (constant.isNull()) { return object(); } } return this; } @Override public void typeFeedback(TypeFeedbackTool tool) { if (targetClass() != null) { tool.addObject(object()).declaredType(targetClass(), false); } } @Override public Result canonical(TypeFeedbackTool tool) { ObjectTypeQuery query = tool.queryObject(object()); if (query.constantBound(Condition.EQ, CiConstant.NULL_OBJECT)) { return new Result(object(), query); } else if (targetClass() != null) { if (query.declaredType(targetClass())) { return new Result(object(), query); } } return null; } public ValueNode object() { return object; } public ValueNode targetClassInstruction() { return targetClassInstruction; } /** * Gets the target class, i.e. the class being cast to, or the class being tested against. * This may be null in the case where the type being tested is dynamically loaded such as * when checking an object array store. * * @return the target class or null if not known */ public RiResolvedType targetClass() { return targetClass; } public RiTypeProfile profile() { return profile; } }