Mercurial > hg > graal-jvmci-8
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/nodes/BeginLockScopeNode.java @ 13153:ae0001b445c0
Common base interface for nodes in the memory graph.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Mon, 25 Nov 2013 17:10:22 +0100 |
parents | 4eec2ac671c2 |
children | 47e4d2e01c6e |
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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.hotspot.*; import com.oracle.graal.nodes.*; import com.oracle.graal.nodes.extended.*; import com.oracle.graal.word.*; /** * 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 AbstractMemoryCheckpoint implements LIRGenLowerable, MonitorEnter, MemoryCheckpoint.Single { private int lockDepth; private BeginLockScopeNode(int lockDepth) { super(null); this.lockDepth = lockDepth; } @Override public boolean hasSideEffect() { return false; } @Override public LocationIdentity getLocationIdentity() { return LocationIdentity.ANY_LOCATION; } @Override public void generate(LIRGenerator gen) { assert lockDepth != -1; HotSpotLIRGenerator hsGen = (HotSpotLIRGenerator) gen; StackSlot slot = hsGen.getLockSlot(lockDepth); Value result = gen.emitAddress(slot); gen.setResult(this, result); } @NodeIntrinsic(setStampFromReturnType = true) public static native Word beginLockScope(@ConstantNodeParameter int lockDepth); }