Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/UnsafeCastNode.java @ 6539:2463eb24b644
Cleanup of Graal API: Rename methods so that it follows the getXxx naming convention and so that they are similar to the names of the java.lang.reflect classes. Remove unused methods.
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Tue, 09 Oct 2012 15:23:38 -0700 |
parents | fb66841a0994 |
children | 2e577202843c |
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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.extended; import com.oracle.graal.api.meta.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * The {@code UnsafeCastNode} produces the same value as its input, but with a different type. */ public final class UnsafeCastNode extends FloatingNode implements Canonicalizable, LIRLowerable { @Input private ValueNode object; private ResolvedJavaType toType; public ValueNode object() { return object; } public UnsafeCastNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull) { super(toType.getKind().isObject() ? new ObjectStamp(toType, exactType, nonNull, false) : StampFactory.forKind(toType.getKind())); this.object = object; this.toType = toType; } public UnsafeCastNode(ValueNode object, ResolvedJavaType toType) { super(toType.getKind().isObject() ? StampFactory.declared(toType, object.stamp().nonNull()) : StampFactory.forKind(toType.getKind())); this.object = object; this.toType = toType; } @Override public ValueNode canonical(CanonicalizerTool tool) { if (object != null) { if (object.kind().isObject()) { if (object.objectStamp().type() != null && object.objectStamp().type().isSubtypeOf(toType)) { if (!isNarrower(objectStamp(), object.objectStamp())) { return object; } } } else if (object.kind() == kind()) { // Removes redundant casts introduced by WordTypeRewriterPhase return object; } } return this; } /** * Determines if one object stamp is narrower than another in terms of nullness and exactness. * * @return true if x is definitely non-null and y's nullness is unknown OR * x's type is exact and the exactness of y's type is unknown */ private static boolean isNarrower(ObjectStamp x, ObjectStamp y) { if (x.nonNull() && !y.nonNull()) { return true; } if (x.isExactType() && !y.isExactType()) { return true; } return false; } @NodeIntrinsic public static native <T> T cast(Object object, @ConstantNodeParameter Class<?> toType); @NodeIntrinsic public static native <T> T cast(Object object, @ConstantNodeParameter Class<?> toType, @ConstantNodeParameter boolean exactType, @ConstantNodeParameter boolean nonNull); @Override public void generate(LIRGeneratorTool generator) { Value result = generator.newVariable(kind()); generator.emitMove(generator.operand(object), result); generator.setResult(this, result); } }