Mercurial > hg > truffle
view graal/com.oracle.max.cri/src/com/sun/cri/ci/CiVariable.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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/* * Copyright (c) 2010, 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.sun.cri.ci; /** * Represents a value that is yet to be bound to a machine location (such as * a {@linkplain CiRegister register} or stack {@linkplain CiAddress address}) * by a register allocator. */ public final class CiVariable extends CiValue { /** * The identifier of the variable. This is a non-zero index in a contiguous 0-based name space. */ public final int index; /** * Creates a new variable. * @param kind * @param index */ private CiVariable(CiKind kind, int index) { super(kind); this.index = index; } private static CiVariable[] generate(CiKind kind, int count) { CiVariable[] variables = new CiVariable[count]; for (int i = 0; i < count; i++) { variables[i] = new CiVariable(kind, i); } return variables; } private static final int CACHE_PER_KIND_SIZE = 100; /** * Cache of common variables. */ private static final CiVariable[][] cache = new CiVariable[CiKind.values().length][]; static { for (CiKind kind : CiKind.values()) { cache[kind.ordinal()] = generate(kind, CACHE_PER_KIND_SIZE); } } /** * Gets a variable for a given kind and index. * * @param kind * @param index * @return the corresponding {@code CiVariable} */ public static CiVariable get(CiKind kind, int index) { //assert kind == kind.stackKind() : "Variables can be only created for stack kinds"; assert index >= 0; CiVariable[] cachedVars = cache[kind.ordinal()]; if (index < cachedVars.length) { return cachedVars[index]; } return new CiVariable(kind, index); } @Override public boolean equals(Object obj) { if (this == obj) { return true; } if (obj instanceof CiVariable) { CiVariable var = (CiVariable) obj; return kind == var.kind && index == var.index; } return false; } @Override public boolean equalsIgnoringKind(CiValue o) { if (this == o) { return true; } if (o instanceof CiVariable) { CiVariable var = (CiVariable) o; return index == var.index; } return false; } @Override public int hashCode() { return (index << 4) | kind.ordinal(); } @Override public String name() { return "v" + index; } }