Mercurial > hg > graal-compiler
view graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/java/CheckCastNode.java @ 5060:4ed4295ce15f
Update import statements.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 08 Mar 2012 19:11:12 +0100 |
parents | ed559a528128 |
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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.max.cri.ci.*; import com.oracle.max.cri.ri.*; import com.oracle.graal.graph.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * The {@code CheckCastNode} represents a {@link Bytecodes#CHECKCAST}. * * The {@link #targetClass()} of a CheckCastNode can be null for array store checks! */ public final class CheckCastNode extends TypeCheckNode implements Canonicalizable, LIRLowerable, Node.IterableNodeType { @Input protected final FixedNode anchor; @Data protected final boolean emitCode; public FixedNode anchor() { return anchor; } public boolean emitCode() { return emitCode; } /** * 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(FixedNode anchor, ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object) { this(anchor, targetClassInstruction, targetClass, object, EMPTY_HINTS, false); } public CheckCastNode(FixedNode anchor, ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object, boolean emitCode) { this(anchor, targetClassInstruction, targetClass, object, EMPTY_HINTS, false, emitCode); } public CheckCastNode(FixedNode anchor, ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object, RiResolvedType[] hints, boolean hintsExact) { this(anchor, targetClassInstruction, targetClass, object, hints, hintsExact, true); } private CheckCastNode(FixedNode anchor, ValueNode targetClassInstruction, RiResolvedType targetClass, ValueNode object, RiResolvedType[] hints, boolean hintsExact, boolean emitCode) { super(targetClassInstruction, targetClass, object, hints, hintsExact, targetClass == null ? StampFactory.forKind(CiKind.Object) : StampFactory.declared(targetClass)); this.anchor = anchor; this.emitCode = emitCode; } @Override public void generate(LIRGeneratorTool gen) { gen.visitCheckCast(this); } @Override public ValueNode canonical(CanonicalizerTool tool) { RiResolvedType objectDeclaredType = object().declaredType(); RiResolvedType targetClass = targetClass(); if (objectDeclaredType != null && targetClass != null && objectDeclaredType.isSubtypeOf(targetClass)) { freeAnchor(); return object(); } CiConstant constant = object().asConstant(); if (constant != null) { assert constant.kind == CiKind.Object; if (constant.isNull()) { freeAnchor(); return object(); } } if (tool.assumptions() != null && hints() != null && targetClass() != null) { if (!hintsExact() && hints().length == 1 && hints()[0] == targetClass().uniqueConcreteSubtype()) { tool.assumptions().recordConcreteSubtype(targetClass(), hints()[0]); return graph().unique(new CheckCastNode(anchor, targetClassInstruction(), targetClass(), object(), hints(), true)); } } return this; } // TODO (thomaswue): Find a better way to handle anchors. private void freeAnchor() { ValueAnchorNode anchorUsage = usages().filter(ValueAnchorNode.class).first(); if (anchorUsage != null) { anchorUsage.replaceFirstInput(this, null); } } @Override public BooleanNode negate() { throw new Error("A CheckCast does not produce a boolean value, so it should actually not be a subclass of BooleanNode"); } }