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annotate graal/GraalCompiler/src/com/sun/c1x/ir/MonitorEnter.java @ 2515:4fdef1464592

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Removed extended bytecodes and related HIR instructions.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 15:36:29 +0200
parents 16b9a8b5ad39
children 0f9eeb15e636
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2507
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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 com.sun.c1x.debug.*;
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26 import com.sun.c1x.value.*;
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27
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28 /**
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29 * The {@code MonitorEnter} instruction represents the acquisition of a monitor.
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30 *
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31 * @author Ben L. Titzer
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32 */
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33 public final class MonitorEnter extends AccessMonitor {
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34
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35 private FrameState stateAfter;
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36
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37 /**
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38 * Creates a new MonitorEnter instruction.
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39 *
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40 * @param object the instruction producing the object
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41 * @param lockAddress the address of the on-stack lock object or {@code null} if the runtime does not place locks on the stack
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42 * @param lockNumber the number of the lock
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43 * @param stateBefore the state before
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44 */
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45 public MonitorEnter(Value object, Value lockAddress, int lockNumber, FrameState stateBefore) {
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46 super(object, lockAddress, stateBefore, lockNumber);
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47 if (object.isNonNull()) {
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48 eliminateNullCheck();
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49 }
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50 }
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51
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52 /**
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53 * Checks whether this instruction can trap.
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54 * @return {@code true} if this instruction may raise a {@link NullPointerException}
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55 */
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56 @Override
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57 public boolean canTrap() {
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58 return needsNullCheck();
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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.visitMonitorEnter(this);
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64 }
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65
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66 public void setStateAfter(FrameState frameState) {
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67 this.stateAfter = frameState;
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68 }
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69
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70 @Override
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71 public FrameState stateAfter() {
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72 return stateAfter;
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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("enter monitor[").print(lockNumber).print("](").print(object()).print(')');
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78 }
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79 }