Mercurial > hg > graal-compiler
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/java/ArrayLengthNode.java @ 18998:ec0733b5a90a
Allow final modifier on node subclasses and start adding the modifier to leaf classes.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Wed, 28 Jan 2015 02:34:14 +0100 |
parents | f57d86eb036f |
children | 3b2e98f9e47c |
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/* * Copyright (c) 2009, 2014, 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.compiler.common.type.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodeinfo.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.util.*; /** * The {@code ArrayLength} instruction gets the length of an array. */ @NodeInfo public final class ArrayLengthNode extends FixedWithNextNode implements Canonicalizable.Unary<ValueNode>, Lowerable, Virtualizable { @Input ValueNode array; public ValueNode array() { return array; } public ValueNode getValue() { return array; } public ArrayLengthNode(ValueNode array) { super(StampFactory.positiveInt()); this.array = array; } public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) { ValueNode length = readArrayLength(forValue, tool.getConstantReflection()); if (length != null) { return length; } return this; } /** * Replicate the {@link ValueProxyNode}s from {@code originalValue} onto {@code value}. * * @param originalValue a possibly proxied value * @param value a value needing proxies * @return proxies wrapping {@code value} */ private static ValueNode reproxyValue(ValueNode originalValue, ValueNode value) { if (value.isConstant()) { // No proxy needed return value; } if (originalValue instanceof ValueProxyNode) { ValueProxyNode proxy = (ValueProxyNode) originalValue; return new ValueProxyNode(reproxyValue(proxy.getOriginalNode(), value), proxy.proxyPoint()); } else if (originalValue instanceof ValueProxy) { ValueProxy proxy = (ValueProxy) originalValue; return reproxyValue(proxy.getOriginalNode(), value); } else { return value; } } /** * Gets the length of an array if possible. * * @return a node representing the length of {@code array} or null if it is not available */ public static ValueNode readArrayLength(ValueNode originalArray, ConstantReflectionProvider constantReflection) { ValueNode length = GraphUtil.arrayLength(originalArray); if (length != null) { // Ensure that any proxies on the original value end up on the length value return reproxyValue(originalArray, length); } ValueNode array = GraphUtil.unproxify(originalArray); if (constantReflection != null && array.isConstant() && !array.isNullConstant()) { JavaConstant constantValue = array.asJavaConstant(); if (constantValue != null && constantValue.isNonNull()) { Integer constantLength = constantReflection.readArrayLength(constantValue); if (constantLength != null) { return ConstantNode.forInt(constantLength); } } } return null; } @Override public void lower(LoweringTool tool) { tool.getLowerer().lower(this, tool); } @NodeIntrinsic public static native int arrayLength(Object array); @Override public void virtualize(VirtualizerTool tool) { State state = tool.getObjectState(array()); if (state != null) { assert state.getVirtualObject().type().isArray(); tool.replaceWithValue(ConstantNode.forInt(state.getVirtualObject().entryCount(), graph())); } } }