Mercurial > hg > graal-compiler
view graal/com.oracle.graal.word/src/com/oracle/graal/word/nodes/WordCastNode.java @ 22646:05183a084a08
updated imports to be explicit and added checkstyle rule to forbid * imports
author | Doug Simon <doug.simon@oracle.com> |
---|---|
date | Wed, 16 Sep 2015 21:17:42 +0200 |
parents | b00cc0475f31 |
children | 1edfd1161cec |
line wrap: on
line source
/* * Copyright (c) 2013, 2015, 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.word.nodes; import jdk.internal.jvmci.meta.AllocatableValue; import jdk.internal.jvmci.meta.JavaConstant; import jdk.internal.jvmci.meta.JavaKind; import jdk.internal.jvmci.meta.LIRKind; import jdk.internal.jvmci.meta.Value; import com.oracle.graal.compiler.common.type.AbstractPointerStamp; import com.oracle.graal.compiler.common.type.ObjectStamp; import com.oracle.graal.compiler.common.type.Stamp; import com.oracle.graal.compiler.common.type.StampFactory; import com.oracle.graal.graph.Node; import com.oracle.graal.graph.NodeClass; import com.oracle.graal.graph.spi.Canonicalizable; import com.oracle.graal.graph.spi.CanonicalizerTool; import com.oracle.graal.nodeinfo.NodeInfo; import com.oracle.graal.nodes.ConstantNode; import com.oracle.graal.nodes.FixedWithNextNode; import com.oracle.graal.nodes.ValueNode; import com.oracle.graal.nodes.spi.LIRLowerable; import com.oracle.graal.nodes.spi.NodeLIRBuilderTool; import com.oracle.graal.word.Word.Opcode; /** * Casts between Word and Object exposed by the {@link Opcode#FROM_ADDRESS}, * {@link Opcode#OBJECT_TO_TRACKED}, {@link Opcode#OBJECT_TO_UNTRACKED} and {@link Opcode#TO_OBJECT} * operations. It has an impact on the pointer maps for the GC, so it must not be scheduled or * optimized away. */ @NodeInfo public final class WordCastNode extends FixedWithNextNode implements LIRLowerable, Canonicalizable { public static final NodeClass<WordCastNode> TYPE = NodeClass.create(WordCastNode.class); @Input ValueNode input; public final boolean trackedPointer; public static WordCastNode wordToObject(ValueNode input, JavaKind wordKind) { assert input.getStackKind() == wordKind; return new WordCastNode(StampFactory.object(), input); } public static WordCastNode addressToWord(ValueNode input, JavaKind wordKind) { assert input.stamp() instanceof AbstractPointerStamp; return new WordCastNode(StampFactory.forKind(wordKind), input); } public static WordCastNode objectToTrackedPointer(ValueNode input, JavaKind wordKind) { assert input.stamp() instanceof ObjectStamp; return new WordCastNode(StampFactory.forKind(wordKind), input, true); } public static WordCastNode objectToUntrackedPointer(ValueNode input, JavaKind wordKind) { assert input.stamp() instanceof ObjectStamp; return new WordCastNode(StampFactory.forKind(wordKind), input, false); } protected WordCastNode(Stamp stamp, ValueNode input) { this(stamp, input, true); } protected WordCastNode(Stamp stamp, ValueNode input, boolean trackedPointer) { super(TYPE, stamp); this.input = input; this.trackedPointer = trackedPointer; } public ValueNode getInput() { return input; } @Override public Node canonical(CanonicalizerTool tool) { if (tool.allUsagesAvailable() && hasNoUsages()) { /* If the cast is unused, it can be eliminated. */ return input; } assert !stamp().isCompatible(input.stamp()); if (input.isConstant()) { /* Null pointers are uncritical for GC, so they can be constant folded. */ if (input.asJavaConstant().isNull()) { return ConstantNode.forIntegerStamp(stamp(), 0); } else if (input.asJavaConstant().getJavaKind().isNumericInteger() && input.asJavaConstant().asLong() == 0) { return ConstantNode.forConstant(stamp(), JavaConstant.NULL_POINTER, tool.getMetaAccess()); } } return this; } @Override public void generate(NodeLIRBuilderTool generator) { Value value = generator.operand(input); LIRKind kind = generator.getLIRGeneratorTool().getLIRKind(stamp()); assert generator.getLIRGeneratorTool().target().getSizeInBytes(kind.getPlatformKind()) == generator.getLIRGeneratorTool().target().getSizeInBytes(value.getPlatformKind()); if (trackedPointer && kind.isValue() && !value.getLIRKind().isValue()) { // just change the PlatformKind, but don't drop reference information kind = value.getLIRKind().changeType(kind.getPlatformKind()); } if (kind.equals(value.getLIRKind())) { generator.setResult(this, value); } else { AllocatableValue result = generator.getLIRGeneratorTool().newVariable(kind); generator.getLIRGeneratorTool().emitMove(result, value); generator.setResult(this, result); } } }