Mercurial > hg > truffle
view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/HotSpotLockStack.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Wed, 27 May 2015 00:36:16 +0200 |
parents | 1c92d437179b |
children |
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/* * Copyright (c) 2013, 2014, 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; import com.oracle.jvmci.code.StackSlotValue; import com.oracle.jvmci.meta.LIRKind; import java.util.*; import com.oracle.graal.lir.framemap.*; /** * Manages allocation and re-use of lock slots in a scoped manner. The slots are used in HotSpot's * lightweight locking mechanism to store the mark word of an object being locked. */ public class HotSpotLockStack { private StackSlotValue[] locks; private final FrameMapBuilder frameMapBuilder; private final LIRKind slotKind; public HotSpotLockStack(FrameMapBuilder frameMapBuilder, LIRKind slotKind) { this.frameMapBuilder = frameMapBuilder; this.slotKind = slotKind; } /** * Gets a stack slot for a lock at a given lock nesting depth, allocating it first if necessary. */ public StackSlotValue makeLockSlot(int lockDepth) { if (locks == null) { locks = new StackSlotValue[lockDepth + 1]; } else if (locks.length < lockDepth + 1) { locks = Arrays.copyOf(locks, lockDepth + 1); } if (locks[lockDepth] == null) { locks[lockDepth] = frameMapBuilder.allocateSpillSlot(slotKind); } return locks[lockDepth]; } }