1 cananian 1.1.2.1 // HClassInfo.java, created Wed Jan 13 17:09:19 1999 by duncan
2 cananian 1.1.2.2 // Copyright (C) 1998 Duncan Bryce <duncan@lcs.mit.edu>
3 cananian 1.1.2.1 // Licensed under the terms of the GNU GPL; see COPYING for details.
4 cananian 1.1.2.1 package harpoon.Interpret.Tree;
5 cananian 1.1.2.1
6 cananian 1.1.2.1 import harpoon.ClassFile.HClass;
7 cananian 1.1.2.1 import harpoon.ClassFile.HField;
8 cananian 1.1.2.1 import harpoon.ClassFile.HMember;
9 cananian 1.1.2.1 import harpoon.ClassFile.HMethod;
10 cananian 1.1.2.1 import harpoon.Util.HClassUtil;
11 cananian 1.1.2.1
12 cananian 1.1.2.1 import java.util.HashMap;
13 cananian 1.1.2.1 import java.util.Map;
14 cananian 1.1.2.1
15 cananian 1.1.2.1 /**
16 cananian 1.1.2.1 * The <code>HClassInfo</code> class provides various useful bits of
17 cananian 1.1.2.1 * information about an <code>HClass</code>.
18 cananian 1.1.2.1 *
19 cananian 1.1.2.2 * @author Duncan Bryce <duncan@lcs.mit.edu>
20 cananian 1.2 * @version $Id: HClassInfo.java,v 1.2 2002/02/25 21:05:50 cananian Exp $
21 cananian 1.1.2.1 * @see harpoon.ClassFile.HClass
22 cananian 1.1.2.1 */
23 cananian 1.1.2.1 class HClassInfo
24 cananian 1.1.2.1 {
25 cananian 1.1.2.1 private HCIMap m_hcim = new HCIMap();
26 cananian 1.1.2.1
27 cananian 1.1.2.1 /**
28 cananian 1.1.2.1 * @return the depth of <code>hc</code> in the class hierarchy
29 cananian 1.1.2.1 */
30 cananian 1.1.2.1 public int depth(HClass hc) {
31 cananian 1.1.2.1 return m_hcim.get(hc).depth();
32 cananian 1.1.2.1 }
33 cananian 1.1.2.1
34 cananian 1.1.2.1 /**
35 cananian 1.1.2.1 * @return the offset of of <code>hf</code> from the initial field.
36 cananian 1.1.2.1 * For instance, if <code>hf</code> is the 3rd field in its class,
37 cananian 1.1.2.1 * <code>getFieldOffset</code> returns 2.
38 cananian 1.1.2.1 */
39 cananian 1.1.2.1 public int getFieldOffset(HField hf) {
40 cananian 1.1.2.1 return m_hcim.get(hf.getDeclaringClass()).getOffset(hf);
41 cananian 1.1.2.1 }
42 cananian 1.1.2.1
43 cananian 1.1.2.1 /**
44 cananian 1.1.2.1 * @return the offset of of <code>hm</code> from the initial method.
45 cananian 1.1.2.1 * For instance, if <code>hm</code> is the 3rd method in its class,
46 cananian 1.1.2.1 * <code>getMethodOffset()</code> returns 2.
47 cananian 1.1.2.1 */
48 cananian 1.1.2.1 public int getMethodOffset(HMethod hm) {
49 cananian 1.1.2.1 return m_hcim.get(hm.getDeclaringClass()).getOffset(hm);
50 cananian 1.1.2.1 }
51 cananian 1.1.2.1
52 cananian 1.1.2.1 /**
53 cananian 1.1.2.1 * @return a String representation of this HClassInfo object
54 cananian 1.1.2.1 */
55 cananian 1.1.2.1 public String toString() { return m_hcim.toString(); }
56 cananian 1.1.2.1
57 cananian 1.1.2.1 /**
58 cananian 1.1.2.1 * @return a String representation of the information stored
59 cananian 1.1.2.1 * about <code>hc</code>
60 cananian 1.1.2.1 */
61 cananian 1.1.2.1 public String toString(HClass hc) { return m_hcim.get(hc).toString(); }
62 cananian 1.1.2.1
63 cananian 1.1.2.1 final class HCIMap {
64 cananian 1.1.2.1 private Map m_table = new HashMap();
65 cananian 1.1.2.1
66 cananian 1.1.2.1 HCIUnit get(HClass hc) {
67 cananian 1.1.2.1 HCIUnit hciu;
68 cananian 1.1.2.1 HClass superclass;
69 cananian 1.1.2.1 HCIUnit superclassInfo;
70 cananian 1.1.2.1
71 cananian 1.1.2.1 hciu = (HCIUnit)m_table.get(hc);
72 cananian 1.1.2.1 if (hciu == null) {
73 cananian 1.1.2.1 if (hc.isArray()) { // Treat arrays differently
74 cananian 1.1.2.1 int dims = HClassUtil.dims(hc);
75 cananian 1.1.2.1 HClass baseclass = HClassUtil.baseClass(hc);
76 cananian 1.1.2.1 // hc is not primitive, so hc.getLinker() is safe.
77 cananian 1.1.2.1 superclass =
78 cananian 1.1.2.1 baseclass.isPrimitive() ?
79 cananian 1.1.2.1 hc.getLinker().forName("java.lang.Object")
80 cananian 1.1.2.1 : (baseclass.getDescriptor()
81 cananian 1.1.2.1 .equals("Ljava/lang/Object;") ?
82 cananian 1.1.2.1 (HClassUtil.arrayClass(hc.getLinker(),
83 cananian 1.1.2.1 baseclass, dims-1))
84 cananian 1.1.2.1 : HClassUtil.arrayClass(hc.getLinker(),
85 cananian 1.1.2.1 baseclass.getSuperclass(),
86 cananian 1.1.2.1 dims));
87 cananian 1.1.2.1 }
88 cananian 1.1.2.1 else { superclass = hc.getSuperclass(); }
89 cananian 1.1.2.1 if (superclass != null) {
90 cananian 1.1.2.1 superclassInfo = get(superclass);
91 cananian 1.1.2.1 hciu = new HCIUnit(hc, superclassInfo);
92 cananian 1.1.2.1 }
93 cananian 1.1.2.1 else {
94 cananian 1.1.2.1 hciu = new HCIUnit(hc);
95 cananian 1.1.2.1 }
96 cananian 1.1.2.1 m_table.put(hc, hciu);
97 cananian 1.1.2.1 }
98 cananian 1.1.2.1 return hciu;
99 cananian 1.1.2.1 }
100 cananian 1.1.2.1
101 cananian 1.1.2.1 public String toString() { return m_table.toString(); }
102 cananian 1.1.2.1 }
103 cananian 1.1.2.1 }
104 cananian 1.1.2.1
105 cananian 1.1.2.1
106 cananian 1.1.2.1 class HCIUnit {
107 cananian 1.1.2.1
108 cananian 1.1.2.1 private HMemberMap m_memberMap;
109 cananian 1.1.2.1 private int m_currentFieldOffset = 0;
110 cananian 1.1.2.1 private int m_currentMethodOffset = 0;
111 cananian 1.1.2.1 private static int m_currentStaticFieldOffset = 0;
112 cananian 1.1.2.1 private int m_depth;
113 cananian 1.1.2.1
114 cananian 1.1.2.1 // Constructor used for classes extending another class
115 cananian 1.1.2.1 // (i.e. anything other than class Object)
116 cananian 1.1.2.1 HCIUnit(HClass hc, HCIUnit scInfo) {
117 cananian 1.1.2.1 m_depth = scInfo.depth() + 1;
118 cananian 1.1.2.1 m_currentMethodOffset = scInfo.m_currentMethodOffset;
119 cananian 1.1.2.1 m_currentFieldOffset = scInfo.m_currentFieldOffset;
120 cananian 1.1.2.1 m_memberMap = new HMemberMap(scInfo.m_memberMap);
121 cananian 1.1.2.1 extend(hc);
122 cananian 1.1.2.1 }
123 cananian 1.1.2.1
124 cananian 1.1.2.1 // Constructor used for classes which don't extend anything
125 cananian 1.1.2.1 // (Object)
126 cananian 1.1.2.1 HCIUnit(HClass hc) {
127 cananian 1.1.2.1 m_depth = 0;
128 cananian 1.1.2.1 m_memberMap = new HMemberMap();
129 cananian 1.1.2.1 extend(hc);
130 cananian 1.1.2.1 }
131 cananian 1.1.2.1
132 cananian 1.1.2.1 int depth() { return m_depth; }
133 cananian 1.1.2.1
134 cananian 1.1.2.1 int getOffset(HMember hm) { return m_memberMap.get(hm); }
135 cananian 1.1.2.1
136 cananian 1.1.2.1 private void extend(HClass hc) {
137 cananian 1.1.2.1 HField[] hFields = hc.getDeclaredFields();
138 cananian 1.1.2.1 for (int i = 0; i < hFields.length; i++) {
139 cananian 1.1.2.1 if (hFields[i].isStatic())
140 cananian 1.1.2.1 m_currentStaticFieldOffset =
141 cananian 1.1.2.1 m_memberMap.map(hFields[i], m_currentStaticFieldOffset);
142 cananian 1.1.2.1 else
143 cananian 1.1.2.1 m_currentFieldOffset =
144 cananian 1.1.2.1 m_memberMap.map(hFields[i], m_currentFieldOffset);
145 cananian 1.1.2.1 }
146 cananian 1.1.2.1
147 cananian 1.1.2.1 HMethod[] hMethods = hc.getDeclaredMethods();
148 cananian 1.1.2.1 for (int i = 0; i < hMethods.length; i++) {
149 cananian 1.1.2.1 m_currentMethodOffset =
150 cananian 1.1.2.1 m_memberMap.map(hMethods[i], m_currentMethodOffset);
151 cananian 1.1.2.1 }
152 cananian 1.1.2.1 }
153 cananian 1.1.2.1
154 cananian 1.1.2.1 public String toString() { return m_memberMap.toString(); }
155 cananian 1.1.2.1
156 cananian 1.1.2.1 // Used to map HMethods and HFields to offsets
157 cananian 1.1.2.1 final class HMemberMap {
158 cananian 1.1.2.1 private Map m_table;
159 cananian 1.1.2.1
160 cananian 1.1.2.1 HMemberMap() { m_table = new HashMap(); }
161 cananian 1.1.2.1
162 cananian 1.1.2.1 HMemberMap(HMemberMap map) { m_table = new HashMap(map.m_table); }
163 cananian 1.1.2.1
164 cananian 1.1.2.1 int map(HField hf, int next) {
165 cananian 1.1.2.1 m_table.put(hf, new Integer(next++));
166 cananian 1.1.2.1 return next;
167 cananian 1.1.2.1 }
168 cananian 1.1.2.1
169 cananian 1.1.2.1 int map(HMethod hm, int next) {
170 cananian 1.1.2.1 int offset;
171 cananian 1.1.2.1 String sig = getSignature(hm);
172 cananian 1.1.2.1
173 cananian 1.1.2.1 if (m_table.get(sig) == null) {
174 cananian 1.1.2.1 // Method does not override anything
175 cananian 1.1.2.1 offset = next++;
176 cananian 1.1.2.1 }
177 cananian 1.1.2.1 else {
178 cananian 1.1.2.1 HMethod scMethod = (HMethod)(m_table.get(sig));
179 cananian 1.1.2.1 offset = ((Integer)m_table.get(scMethod)).intValue();
180 cananian 1.1.2.1 }
181 cananian 1.1.2.1
182 cananian 1.1.2.1 m_table.put(sig, hm);
183 cananian 1.1.2.1 m_table.put(hm, new Integer(offset));
184 cananian 1.1.2.1
185 cananian 1.1.2.1 return next;
186 cananian 1.1.2.1 }
187 cananian 1.1.2.1
188 cananian 1.1.2.1 int get(HMember hm) {
189 cananian 1.1.2.1 return (m_table.containsKey(hm) ?
190 cananian 1.1.2.1 ((Integer)m_table.get(hm)).intValue() :
191 cananian 1.1.2.1 Integer.MIN_VALUE);
192 cananian 1.1.2.1 }
193 cananian 1.1.2.1
194 cananian 1.1.2.1 private String getSignature(HMethod hm) {
195 cananian 1.1.2.1 HClass[] paramTypes;
196 cananian 1.1.2.1 StringBuffer sb;
197 cananian 1.1.2.1
198 cananian 1.1.2.1 sb = new StringBuffer("");
199 cananian 1.1.2.1 sb.append(hm.getName());
200 cananian 1.1.2.1 paramTypes = hm.getParameterTypes();
201 cananian 1.1.2.1 for (int i = 0; i < paramTypes.length; i++)
202 cananian 1.1.2.1 sb.append(paramTypes[i].toString());
203 cananian 1.1.2.1 return sb.toString();
204 cananian 1.1.2.1 }
205 cananian 1.1.2.1
206 cananian 1.1.2.1 public String toString() { return m_table.toString(); }
207 cananian 1.1.2.1 }
208 cananian 1.2 }