Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapForCacheEntry.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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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 } |