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1 /*
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2 * Copyright 2001 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.interpreter;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.oops.*;
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29 import sun.jvm.hotspot.utilities.*;
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30
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31 class OopMapForCacheEntry extends GenerateOopMap {
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32 private OopMapCacheEntry entry;
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33 private int bci;
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34 private int stackTop;
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35
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36 OopMapForCacheEntry(Method method, int bci, OopMapCacheEntry entry) {
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37 super(method);
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38 this.entry = entry;
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39 this.bci = bci;
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40 this.stackTop = -1;
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41 }
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42
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43 public boolean reportResults() { return false; }
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44
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45 public boolean possibleGCPoint(BytecodeStream bcs) {
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46 return false; // We are not reporting any result. We call resultForBasicblock directly
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47 }
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48
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49 public void fillStackmapProlog(int nof_gc_points) {
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50 // Do nothing
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51 }
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52
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53 public void fillStackmapEpilog() {
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54 // Do nothing
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55 }
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56
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57 public void fillStackmapForOpcodes(BytecodeStream bcs,
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58 CellTypeStateList vars,
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59 CellTypeStateList stack,
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60 int stackTop) {
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61 // Only interested in one specific bci
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62 if (bcs.bci() == bci) {
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63 entry.setMask(vars, stack, stackTop);
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64 this.stackTop = stackTop;
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65 }
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66 }
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67
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68 public void fillInitVars(List/*<Integer>*/ initVars) {
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69 // Do nothing
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70 }
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71
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72 public void computeMap() {
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73 if (Assert.ASSERTS_ENABLED) {
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74 Assert.that(!method().isNative(), "cannot compute oop map for native methods");
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75 }
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76 // First check if it is a method where the stackmap is always empty
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77 if (method().getCodeSize() == 0 || method().getMaxLocals() + method().getMaxStack() == 0) {
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78 entry.setEmptyMask();
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79 } else {
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80 super.computeMap();
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81 resultForBasicblock(bci);
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82 }
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83 }
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84
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85 public int size() {
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86 if (Assert.ASSERTS_ENABLED) {
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87 Assert.that(stackTop != -1, "computeMap must be called first");
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88 }
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89 return (int) ((method().isStatic() ? 0 : 1) + method().getMaxLocals() + stackTop);
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90 }
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91 }
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