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annotate graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/HotSpotLockStack.java @ 9133:e895d8f4a6aa

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PartialCanonicalizerPhase.
author Roland Schatz <roland.schatz@oracle.com>
date Tue, 16 Apr 2013 13:21:19 +0200
parents 82f6a25321b8
children c0b8d395368b
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1 /*
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2 * Copyright (c) 2013, 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.oracle.graal.hotspot;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.api.code.*;
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28 import com.oracle.graal.api.meta.*;
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29 import com.oracle.graal.lir.*;
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30
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31 /**
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32 * Manages allocation and re-use of lock slots in a scoped manner. The slots are used in HotSpot's
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33 * lightweight locking mechanism to store the mark word of an object being locked.
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34 */
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35 public class HotSpotLockStack {
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36
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37 private StackSlot[] locks;
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38 private final FrameMap frameMap;
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39 private final Kind slotKind;
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40
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41 public HotSpotLockStack(FrameMap frameMap, Kind slotKind) {
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42 this.frameMap = frameMap;
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43 this.slotKind = slotKind;
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44 }
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45
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46 /**
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47 * Gets a stack slot for a lock at a given lock nesting depth, allocating it first if necessary.
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48 */
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49 public StackSlot makeLockSlot(int lockDepth) {
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50 if (locks == null) {
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51 locks = new StackSlot[lockDepth + 1];
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52 } else if (locks.length < lockDepth + 1) {
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53 locks = Arrays.copyOf(locks, lockDepth + 1);
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54 }
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55 if (locks[lockDepth] == null) {
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56 locks[lockDepth] = frameMap.allocateSpillSlot(slotKind);
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57 }
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58 return locks[lockDepth];
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59 }
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60 }