Mercurial > hg > graal-jvmci-8
diff graal/Compiler/src/com/sun/c1x/ir/MonitorEnter.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/Compiler/src/com/sun/c1x/ir/MonitorEnter.java Wed Apr 27 11:43:22 2011 +0200 @@ -0,0 +1,79 @@ +/* + * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ +package com.sun.c1x.ir; + +import com.sun.c1x.debug.*; +import com.sun.c1x.value.*; + +/** + * The {@code MonitorEnter} instruction represents the acquisition of a monitor. + * + * @author Ben L. Titzer + */ +public final class MonitorEnter extends AccessMonitor { + + private FrameState stateAfter; + + /** + * Creates a new MonitorEnter instruction. + * + * @param object the instruction producing the object + * @param lockAddress the address of the on-stack lock object or {@code null} if the runtime does not place locks on the stack + * @param lockNumber the number of the lock + * @param stateBefore the state before + */ + public MonitorEnter(Value object, Value lockAddress, int lockNumber, FrameState stateBefore) { + super(object, lockAddress, stateBefore, lockNumber); + if (object.isNonNull()) { + eliminateNullCheck(); + } + } + + /** + * Checks whether this instruction can trap. + * @return {@code true} if this instruction may raise a {@link NullPointerException} + */ + @Override + public boolean canTrap() { + return needsNullCheck(); + } + + @Override + public void accept(ValueVisitor v) { + v.visitMonitorEnter(this); + } + + public void setStateAfter(FrameState frameState) { + this.stateAfter = frameState; + } + + @Override + public FrameState stateAfter() { + return stateAfter; + } + + @Override + public void print(LogStream out) { + out.print("enter monitor[").print(lockNumber).print("](").print(object()).print(')'); + } +}