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

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002-2004 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.jdi;
26 import com.sun.jdi.*;
27
28 public class LocalVariableImpl extends MirrorImpl
29 implements LocalVariable, ValueContainer
30 {
31 private final Method method;
32 private final int slot;
33 private final Location scopeStart;
34 private final Location scopeEnd;
35 private final String name;
36 private final String signature;
37 private final String genericSignature;
38
39 LocalVariableImpl(VirtualMachine vm, Method method,
40 int slot, Location scopeStart, Location scopeEnd,
41 String name, String signature, String genericSignature) {
42 super(vm);
43 this.method = method;
44 this.slot = slot;
45 this.scopeStart = scopeStart;
46 this.scopeEnd = scopeEnd;
47 this.name = name;
48 this.signature = signature;
49 this.genericSignature = genericSignature;
50 }
51
52 public boolean equals(Object obj) {
53 if ((obj != null) && (obj instanceof LocalVariableImpl)) {
54 LocalVariableImpl other = (LocalVariableImpl)obj;
55 return (method.equals(other.method) &&
56 slot() == other.slot() &&
57 super.equals(obj));
58 } else {
59 return false;
60 }
61 }
62
63 public int hashCode() {
64 /*
65 * TO DO: Better hash code
66 */
67 return (int)method.hashCode() + slot();
68 }
69
70 public int compareTo(Object object) {
71 LocalVariableImpl other = (LocalVariableImpl)object;
72 int rc = method.compareTo(other.method);
73 if (rc == 0) {
74 rc = slot() - other.slot();
75 }
76 return rc;
77 }
78
79 public String name() {
80 return name;
81 }
82
83 /**
84 * @return a text representation of the declared type
85 * of this variable.
86 */
87 public String typeName() {
88 JNITypeParser parser = new JNITypeParser(signature);
89 return parser.typeName();
90 }
91
92 public Type type() throws ClassNotLoadedException {
93 return findType(signature());
94 }
95
96 public Type findType(String signature) throws ClassNotLoadedException {
97 ReferenceTypeImpl enclosing = (ReferenceTypeImpl)method.declaringType();
98 return enclosing.findType(signature);
99 }
100
101 public String signature() {
102 return signature;
103 }
104
105 public String genericSignature() {
106 return genericSignature;
107 }
108
109 public boolean isVisible(StackFrame frame) {
110 //validateMirror(frame);
111 Method frameMethod = frame.location().method();
112
113 if (!frameMethod.equals(method)) {
114 throw new IllegalArgumentException(
115 "frame method different than variable's method");
116 }
117
118 // this is here to cover the possibility that we will
119 // allow LocalVariables for native methods. If we do
120 // so we will have to re-examinine this.
121 if (frameMethod.isNative()) {
122 return false;
123 }
124
125 return ((scopeStart.compareTo(frame.location()) <= 0)
126 && (scopeEnd.compareTo(frame.location()) >= 0));
127 }
128
129 public boolean isArgument() {
130 try {
131 MethodImpl method = (MethodImpl)scopeStart.method();
132 return (slot < method.argSlotCount());
133 } catch (AbsentInformationException e) {
134 // If this variable object exists, there shouldn't be absent info
135 throw (InternalException) new InternalException().initCause(e);
136 }
137 }
138
139 int slot() {
140 return slot;
141 }
142
143 /*
144 * Compilers/VMs can have byte code ranges for variables of the
145 * same names that overlap. This is because the byte code ranges
146 * aren't necessarily scopes; they may have more to do with the
147 * lifetime of the variable's slot, depending on implementation.
148 *
149 * This method determines whether this variable hides an
150 * identically named variable; ie, their byte code ranges overlap
151 * this one starts after the given one. If it returns true this
152 * variable should be preferred when looking for a single variable
153 * with its name when both variables are visible.
154 */
155 boolean hides(LocalVariable other) {
156 LocalVariableImpl otherImpl = (LocalVariableImpl)other;
157 if (!method.equals(otherImpl.method) ||
158 !name.equals(otherImpl.name)) {
159 return false;
160 } else {
161 return (scopeStart.compareTo(otherImpl.scopeStart) > 0);
162 }
163 }
164
165 public String toString() {
166 return name() + " in " + method.toString() +
167 "@" + scopeStart.toString();
168 }
169 }