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annotate graal/com.oracle.max.asmdis/src/com/sun/max/asm/ppc/ZeroOrRegister.java @ 4142:bc8527f3071c

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Adjust code base to new level of warnings.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Sun, 18 Dec 2011 05:24:06 +0100
parents e233f5660da4
children
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1 /*
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2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.sun.max.asm.ppc;
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24
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25 import com.sun.max.asm.*;
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26 import com.sun.max.util.*;
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27
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28 /**
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29 * The super type of all the {@link GPR General Purpose Registers} and the constant {@link Zero#ZERO}.
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30 */
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31 public abstract class ZeroOrRegister extends AbstractSymbolicArgument {
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32
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33 ZeroOrRegister(String name, int value) {
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34 super(name, value);
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35 }
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36
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37 /**
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38 * Determines if this register specifier is outside the range of registers
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39 * {@code [target .. target+n]} where the range
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40 * wraps at 32.
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41 */
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42 public boolean isOutsideRegisterRange(GPR target, int n) {
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43 final int rt = target.value();
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44 final int ra = value();
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45 final int numRegs = (n + 3) / 4;
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46 final int lastReg = (rt + numRegs - 1) % 32;
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47 final boolean wrapsAround = lastReg < rt;
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48 if (wrapsAround) {
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49 return lastReg < ra && ra < rt;
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50 }
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51 return ra < rt || lastReg < ra;
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52 }
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53
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54 public static Symbolizer<ZeroOrRegister> symbolizer() {
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55 if (symbolizer == null) {
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56 symbolizer = Symbolizer.Static.fromList(ZeroOrRegister.class, GPR.GPR_SYMBOLIZER, Zero.ZERO);
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57 }
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58 return symbolizer;
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59 }
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60
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61 // This must be lazily constructed to avoid dependency on the GPR class initializer
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62 private static Symbolizer<ZeroOrRegister> symbolizer;
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63
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64 }