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comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapForCacheEntry.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.interpreter;
26
27 import java.util.*;
28 import sun.jvm.hotspot.oops.*;
29 import sun.jvm.hotspot.utilities.*;
30
31 class OopMapForCacheEntry extends GenerateOopMap {
32 private OopMapCacheEntry entry;
33 private int bci;
34 private int stackTop;
35
36 OopMapForCacheEntry(Method method, int bci, OopMapCacheEntry entry) {
37 super(method);
38 this.entry = entry;
39 this.bci = bci;
40 this.stackTop = -1;
41 }
42
43 public boolean reportResults() { return false; }
44
45 public boolean possibleGCPoint(BytecodeStream bcs) {
46 return false; // We are not reporting any result. We call resultForBasicblock directly
47 }
48
49 public void fillStackmapProlog(int nof_gc_points) {
50 // Do nothing
51 }
52
53 public void fillStackmapEpilog() {
54 // Do nothing
55 }
56
57 public void fillStackmapForOpcodes(BytecodeStream bcs,
58 CellTypeStateList vars,
59 CellTypeStateList stack,
60 int stackTop) {
61 // Only interested in one specific bci
62 if (bcs.bci() == bci) {
63 entry.setMask(vars, stack, stackTop);
64 this.stackTop = stackTop;
65 }
66 }
67
68 public void fillInitVars(List/*<Integer>*/ initVars) {
69 // Do nothing
70 }
71
72 public void computeMap() {
73 if (Assert.ASSERTS_ENABLED) {
74 Assert.that(!method().isNative(), "cannot compute oop map for native methods");
75 }
76 // First check if it is a method where the stackmap is always empty
77 if (method().getCodeSize() == 0 || method().getMaxLocals() + method().getMaxStack() == 0) {
78 entry.setEmptyMask();
79 } else {
80 super.computeMap();
81 resultForBasicblock(bci);
82 }
83 }
84
85 public int size() {
86 if (Assert.ASSERTS_ENABLED) {
87 Assert.that(stackTop != -1, "computeMap must be called first");
88 }
89 return (int) ((method().isStatic() ? 0 : 1) + method().getMaxLocals() + stackTop);
90 }
91 }