Mercurial > hg > graal-compiler
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/BeginLockScopeNode.java @ 6436:5395ecdfce8a
move monitors into FrameState (fixes subtle issues for tail duplication and other optimizations)
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Tue, 25 Sep 2012 17:50:01 +0200 |
parents | abeeb57b655d |
children | fb66841a0994 |
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/* * Copyright (c) 2012, 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.oracle.graal.hotspot.nodes; import com.oracle.graal.api.code.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.gen.*; import com.oracle.graal.compiler.target.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.nodes.type.*; import com.oracle.graal.snippets.*; /** * Intrinsic for opening a scope binding a stack-based lock with an object. * A lock scope must be closed with an {@link EndLockScopeNode}. * The frame state after this node denotes that the object is locked * (ensuring the GC sees and updates the object) so it must come * after any null pointer check on the object. */ public final class BeginLockScopeNode extends AbstractStateSplit implements LIRGenLowerable, MonitorEnter { private final boolean eliminated; public BeginLockScopeNode(boolean eliminated, Kind wordKind) { super(StampFactory.forWord(wordKind, true)); this.eliminated = eliminated; } @Override public boolean hasSideEffect() { return false; } @Override public void generate(LIRGenerator gen) { gen.lock(); StackSlot lockData = gen.peekLock(); Value result = eliminated ? new Constant(gen.target().wordKind, 0L) : gen.emitLea(lockData); FrameState stateAfter = stateAfter(); assert stateAfter != null; gen.setResult(this, result); } @SuppressWarnings("unused") @NodeIntrinsic public static Word beginLockScope(@ConstantNodeParameter boolean eliminated, @ConstantNodeParameter Kind wordKind) { throw new UnsupportedOperationException(); } }