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annotate graal/Compiler/src/com/sun/c1x/ir/TableSwitch.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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2507
9ec15d6914ca Pull over of compiler from maxine repository.
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1 /*
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2 * Copyright (c) 2009, 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.c1x.ir;
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24
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25 import static com.sun.c1x.debug.InstructionPrinter.InstructionLineColumn.*;
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26
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27 import java.util.*;
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28
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29 import com.sun.c1x.debug.*;
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30 import com.sun.c1x.value.*;
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31
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32 /**
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33 * The {@code TableSwitch} instruction represents a table switch.
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34 *
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35 * @author Ben L. Titzer
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36 */
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37 public final class TableSwitch extends Switch {
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38
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39 final int lowKey;
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40
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41 /**
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42 * Constructs a new TableSwitch instruction.
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43 * @param value the instruction producing the value being switched on
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44 * @param successors the list of successors
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45 * @param lowKey the lowest integer key in the table
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46 * @param stateBefore the state before the switch
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47 * @param isSafepoint {@code true} if this instruction is a safepoint
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48 */
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49 public TableSwitch(Value value, List<BlockBegin> successors, int lowKey, FrameState stateBefore, boolean isSafepoint) {
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50 super(value, successors, stateBefore, isSafepoint);
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51 this.lowKey = lowKey;
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52 }
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53
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54 /**
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55 * Gets the lowest key in the table switch (inclusive).
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56 * @return the low key
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57 */
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58 public int lowKey() {
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59 return lowKey;
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60 }
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61
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62 /**
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63 * Gets the highest key in the table switch (exclusive).
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64 * @return the high key
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65 */
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66 public int highKey() {
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67 return lowKey + numberOfCases();
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68 }
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69
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70 @Override
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71 public void accept(ValueVisitor v) {
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72 v.visitTableSwitch(this);
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73 }
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74
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75 @Override
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76 public void print(LogStream out) {
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77 out.print("tableswitch ");
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78 if (isSafepoint()) {
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79 out.print("(safepoint) ");
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80 }
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81 out.println(value());
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82 int l = numberOfCases();
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83 for (int i = 0; i < l; i++) {
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84 INSTRUCTION.advance(out);
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85 out.printf("case %5d: B%d%n", lowKey() + i, successors().get(i).blockID);
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86 }
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87 INSTRUCTION.advance(out);
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88 out.print("default : B").print(defaultSuccessor().blockID);
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89 }
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90 }