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annotate agent/src/share/classes/sun/jvm/hotspot/debugger/cdbg/basic/BasicBitType.java @ 1913:3b2dea75431e
6984311: JSR 292 needs optional bootstrap method parameters
Summary: Allow CONSTANT_InvokeDynamic nodes to have any number of extra operands.
Reviewed-by: twisti
author | jrose |
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date | Sat, 30 Oct 2010 13:08:23 -0700 |
parents | c18cbe5936b8 |
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rev | line source |
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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.debugger.cdbg.basic; | |
26 | |
27 import sun.jvm.hotspot.debugger.*; | |
28 import sun.jvm.hotspot.debugger.cdbg.*; | |
29 import sun.jvm.hotspot.utilities.Assert; | |
30 | |
31 public class BasicBitType extends BasicIntType implements BitType { | |
32 // Integer type or lazy type | |
33 private Type underlyingType; | |
34 private int sizeInBits; | |
35 private int offset; | |
36 | |
37 /** Underlying type of enum must be an integer type (or as yet | |
38 unresolved) */ | |
39 | |
40 public BasicBitType(Type underlyingType, int sizeInBits, int lsbOffset) { | |
41 this(underlyingType, sizeInBits, lsbOffset, 0); | |
42 } | |
43 | |
44 private BasicBitType(Type underlyingType, int sizeInBits, int lsbOffset, int cvAttributes) { | |
45 super(null, 0, false, cvAttributes); | |
46 this.underlyingType = underlyingType; | |
47 this.sizeInBits = sizeInBits; | |
48 this.offset = lsbOffset; | |
49 } | |
50 | |
51 public BitType asBit() { return this; } | |
52 | |
53 public int getSize() { return underlyingType.getSize(); } | |
54 public boolean isUnsigned() { | |
55 if (underlyingType.isInt()) { | |
56 return ((IntType) underlyingType).isUnsigned(); | |
57 } | |
58 return false; | |
59 } | |
60 | |
61 public int getSizeInBits() { | |
62 return sizeInBits; | |
63 } | |
64 | |
65 public int getOffset() { | |
66 return offset; | |
67 } | |
68 | |
69 Type resolveTypes(BasicCDebugInfoDataBase db, ResolveListener listener) { | |
70 super.resolveTypes(db, listener); | |
71 underlyingType = db.resolveType(this, underlyingType, listener, "resolving bit type"); | |
72 setName(underlyingType.getName()); | |
73 if (Assert.ASSERTS_ENABLED) { | |
74 BasicType b = (BasicType) underlyingType; | |
75 Assert.that(b.isLazy() || b.isInt(), | |
76 "Underlying type of bitfield must be integer type (or unresolved due to error)"); | |
77 } | |
78 return this; | |
79 } | |
80 | |
81 public void iterateObject(Address a, ObjectVisitor v, FieldIdentifier f) { | |
82 long mask = maskFor(sizeInBits); | |
83 long val = ((a.getCIntegerAt(0, getSize(), isUnsigned())) >> getOffset()) & mask; | |
84 if (!isUnsigned()) { | |
85 if ((val & highBit(sizeInBits)) != 0) { | |
86 // Must sign extend | |
87 val = val | (~mask); | |
88 } | |
89 } | |
90 v.doBit(f, val); | |
91 } | |
92 | |
93 protected Type createCVVariant(int cvAttributes) { | |
94 return new BasicBitType(underlyingType, getSizeInBits(), getOffset(), cvAttributes); | |
95 } | |
96 | |
97 public void visit(TypeVisitor v) { | |
98 v.doBitType(this); | |
99 } | |
100 | |
101 private static long maskFor(int sizeInBits) { | |
102 return ((1 << sizeInBits) - 1); | |
103 } | |
104 | |
105 private static long highBit(int sizeInBits) { | |
106 return (1 << (sizeInBits - 1)); | |
107 } | |
108 } |