Mercurial > hg > truffle
view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/LocationNode.java @ 9524:ff8d87eabda8
Refactor the LocationNode class hierarchy to allow a SnippetLocationNode, i.e., a LocationNode that can be used in snippets without requiring the individual components to be constants at the time the snippet is prepared
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Thu, 02 May 2013 10:36:09 -0700 |
parents | 9ee5f3bfa755 |
children | 038fa65cbd8d |
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/* * Copyright (c) 2011, 2012, 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.graph.Node.ValueNumberable; import com.oracle.graal.nodes.calc.*; import com.oracle.graal.nodes.spi.*; import com.oracle.graal.nodes.type.*; /** * A location for a memory access in terms of the kind of value accessed and how to access it. All * locations have the form [base + location], where base is a node and location is defined by * subclasses of the {@link LocationNode}. */ public abstract class LocationNode extends FloatingNode implements LIRLowerable, ValueNumberable { /** * Creates a new unique location identity for read and write operations. * * @param name the name of the new location identity, for debugging purposes * @return the new location identity */ public static Object createLocation(final String name) { return new Object() { @Override public String toString() { return name; } }; } /** * Denotes any location. A write to such a location kills all values in a memory map during an * analysis of memory accesses in a graph. A read from this location cannot be moved or * coalesced with other reads because its interaction with other reads is not known. */ public static final Object ANY_LOCATION = createLocation("ANY_LOCATION"); /** * Denotes the location of a value that is guaranteed to be final. */ public static final Object FINAL_LOCATION = createLocation("FINAL_LOCATION"); /** * Marker interface for locations in snippets. */ public interface Location { } public static Object getArrayLocation(Kind elementKind) { return elementKind; } protected LocationNode(Stamp stamp) { super(stamp); } /** * Returns the kind of the accessed memory value. */ public abstract Kind getValueKind(); /** * Returns the identity of the accessed memory location. Apart from the special values * {@link #ANY_LOCATION} and {@link #FINAL_LOCATION}, a different location identity of two * memory accesses guarantees that the two accesses do not interfere. */ public abstract Object locationIdentity(); @Override public final void generate(LIRGeneratorTool generator) { // nothing to do... } public abstract Value generateAddress(LIRGeneratorTool gen, Value base); }