Mercurial > hg > truffle
diff 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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.max.cri/src/com/sun/cri/ci/CiVariable.java Sat Dec 17 19:59:18 2011 +0100 @@ -0,0 +1,117 @@ +/* + * 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; + } +}