Mercurial > hg > graal-compiler

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial load
author duke
date Sat, 01 Dec 2007 00:00:00 +0000
parents
children c18cbe5936b8
comparison
equal deleted inserted replaced
-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 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 }