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annotate graal/Compiler/src/com/sun/c1x/ir/Infopoint.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 static com.sun.cri.bytecode.Bytecodes.*;
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26
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27 import com.sun.c1x.debug.*;
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28 import com.sun.c1x.value.*;
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29 import com.sun.cri.bytecode.*;
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30 import com.sun.cri.ci.*;
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31
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32 /**
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33 * Records debug info at the current code location.
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34 *
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35 * @author Doug Simon
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36 */
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37 public final class Infopoint extends Instruction {
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38
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39 public final FrameState state;
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40
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41 /**
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42 * {@link Bytecodes#HERE}, {@link Bytecodes#INFO} or {@link Bytecodes#SAFEPOINT}.
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43 */
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44 public final int opcode;
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45
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46 /**
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47 * Creates a new Infopoint instance.
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48 * @param state the debug info at this instruction
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49 */
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50 public Infopoint(int opcode, FrameState state) {
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51 super(opcode == HERE ? CiKind.Long : CiKind.Void);
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52 assert opcode == HERE || opcode == INFO || opcode == SAFEPOINT : Bytecodes.nameOf(opcode);
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53 this.opcode = opcode;
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54 this.state = state;
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55 setFlag(Flag.LiveSideEffect); // ensure this instruction is not eliminated
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56 if (opcode == SAFEPOINT) {
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57 setFlag(Value.Flag.IsSafepoint);
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58 }
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59 }
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60
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61 @Override
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62 public void accept(ValueVisitor v) {
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63 v.visitInfopoint(this);
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64 }
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65
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66 @Override
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67 public FrameState stateBefore() {
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68 return state;
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69 }
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70
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71 @Override
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72 public void print(LogStream out) {
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73 out.print(Bytecodes.nameOf(opcode));
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74 }
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75 }