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annotate agent/src/share/classes/sun/jvm/hotspot/interpreter/OopMapCacheEntry.java @ 3944:35c656d0b685
7090654: nightly failures after 7086585
Reviewed-by: kvn
author | never |
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date | Wed, 14 Sep 2011 13:57:32 -0700 |
parents | c18cbe5936b8 |
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0 | 1 /* |
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2 * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.interpreter; | |
26 | |
27 import sun.jvm.hotspot.oops.*; | |
28 import sun.jvm.hotspot.utilities.*; | |
29 | |
30 public class OopMapCacheEntry { | |
31 // Iteration | |
32 public boolean isValue(int offset) { return !entryAt(offset); } | |
33 public boolean isOop (int offset) { return entryAt(offset); } | |
34 public void iterateOop(OffsetClosure oopClosure) { | |
35 int n = numberOfEntries(); | |
36 for (int i = 0; i < n; i++) { | |
37 if (entryAt(i)) { | |
38 oopClosure.offsetDo(i); | |
39 } | |
40 } | |
41 } | |
42 | |
43 // Initialization | |
44 public void fill(Method method, int bci) { | |
45 this.method = method; | |
46 this.bci = bci; | |
47 if (method.isNative()) { | |
48 // Native method activations have oops only among the parameters and one | |
49 // extra oop following the parameters (the mirror for static native methods). | |
50 fillForNative(); | |
51 } else { | |
52 OopMapForCacheEntry gen = new OopMapForCacheEntry(method, bci, this); | |
53 gen.computeMap(); | |
54 } | |
55 } | |
56 | |
57 public void setMask(CellTypeStateList vars, | |
58 CellTypeStateList stack, | |
59 int stackTop) { | |
60 // compute bit mask size | |
61 int maxLocals = (int) method.getMaxLocals(); | |
62 int nEntries = maxLocals + stackTop; | |
63 maskSize = nEntries; | |
64 allocateBitMask(); | |
65 | |
66 CellTypeStateList curList = vars; | |
67 int listIdx = 0; | |
68 | |
69 for (int entryIdx = 0; entryIdx < nEntries; entryIdx++, listIdx++) { | |
70 // switch to stack when done with locals | |
71 if (entryIdx == maxLocals) { | |
72 curList = stack; | |
73 listIdx = 0; | |
74 } | |
75 | |
76 CellTypeState cell = curList.get(listIdx); | |
77 // set oop bit | |
78 if ( cell.isReference()) { | |
79 mask.atPut(entryIdx, true); | |
80 } | |
81 } | |
82 | |
83 // verify bit mask | |
84 if (Assert.ASSERTS_ENABLED) { | |
85 Assert.that(verifyMask(vars, stack, maxLocals, stackTop), "mask could not be verified"); | |
86 } | |
87 } | |
88 | |
89 //---------------------------------------------------------------------- | |
90 // Internals only below this point | |
91 // | |
92 private Method method; // the method for which the mask is valid | |
93 private int bci; // the bci for which the mask is valid | |
94 private int maskSize; // the required mask size in bits | |
95 private BitMap mask; // may be null if mask is empty | |
96 | |
97 Method method() { return method; } | |
98 int bci() { return bci; } | |
99 int numberOfEntries() { return maskSize; } | |
100 boolean entryAt(int offset) { | |
101 return mask.at(offset); | |
102 } | |
103 | |
104 void setEmptyMask() { mask = null; } | |
105 void allocateBitMask() { | |
106 if (maskSize > 0) { | |
107 mask = new BitMap(maskSize); | |
108 } | |
109 } | |
110 | |
111 // fills the bit mask for native calls | |
112 void fillForNative() { | |
113 if (Assert.ASSERTS_ENABLED) { | |
114 Assert.that(method.isNative(), "method must be native method"); | |
115 } | |
116 maskSize = (int) method.getSizeOfParameters(); | |
117 allocateBitMask(); | |
118 // fill mask for parameters | |
119 MaskFillerForNative mf = new MaskFillerForNative(method, mask, maskSize); | |
120 mf.generate(); | |
121 } | |
122 | |
123 static class VerifyClosure implements OffsetClosure { | |
124 private OopMapCacheEntry entry; | |
125 private boolean failed; | |
126 | |
127 VerifyClosure(OopMapCacheEntry entry) { this.entry = entry; } | |
128 public void offsetDo(int offset) { if (!entry.isOop(offset)) failed = true; } | |
129 boolean failed() { return failed; } | |
130 } | |
131 | |
132 boolean verifyMask(CellTypeStateList vars, CellTypeStateList stack, int maxLocals, int stackTop) { | |
133 // Check mask includes map | |
134 VerifyClosure blk = new VerifyClosure(this); | |
135 iterateOop(blk); | |
136 if (blk.failed()) return false; | |
137 | |
138 // Check if map is generated correctly | |
139 for(int i = 0; i < maxLocals; i++) { | |
140 boolean v1 = isOop(i); | |
141 boolean v2 = vars.get(i).isReference(); | |
142 if (Assert.ASSERTS_ENABLED) { | |
143 Assert.that(v1 == v2, "locals oop mask generation error"); | |
144 } | |
145 } | |
146 | |
147 for(int j = 0; j < stackTop; j++) { | |
148 boolean v1 = isOop(maxLocals + j); | |
149 boolean v2 = stack.get(j).isReference(); | |
150 if (Assert.ASSERTS_ENABLED) { | |
151 Assert.that(v1 == v2, "stack oop mask generation error"); | |
152 } | |
153 } | |
154 return true; | |
155 } | |
156 } |