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annotate graal/Compiler/src/com/sun/c1x/ir/BoundsCheck.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) 2010, 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 com.sun.c1x.debug.*;
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26 import com.sun.c1x.value.*;
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27 import com.sun.cri.ci.*;
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28
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29 /**
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30 * Performs a bounds check on the index variable given a length. Deoptimizes on index < 0 || index >= length.
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31 *
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32 * @author Thomas Wuerthinger
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33 *
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34 */
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35 public final class BoundsCheck extends Guard {
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36
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37 Value index;
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38 Value length;
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39
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40 public BoundsCheck(Value index, Value length, FrameState stateBefore, Condition condition) {
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41 super(condition, stateBefore);
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42 this.index = index;
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43 this.length = length;
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44 assert index.kind == CiKind.Int;
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45 assert length.kind == CiKind.Int;
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46 }
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47
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48 public Value index() {
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49 return index;
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50 }
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51
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52 public Value length() {
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53 return length;
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54 }
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55
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56 @Override
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57 public void inputValuesDo(ValueClosure closure) {
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58 index = closure.apply(index);
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59 length = closure.apply(length);
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60 }
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61
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62 @Override
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63 public void accept(ValueVisitor v) {
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64 v.visitBoundsCheck(this);
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65 }
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66
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67 @Override
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68 public void print(LogStream out) {
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69 out.print("boundsCheck ").print(index).print(" ").print(length);
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70 }
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71 }