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1
30
31 package jbet.cmd;
32 import jbet.*;
33 import java.util.*;
34 import java.io.*;
35
36 public class property implements Command {
37
38 public int helplevel() { return 3; }
39 public String  shorthelp() { return "implement property"; }
40 public String longhelp() { return "jbet propterty <class> <class> ....\n"; }
41
42
43 static public void makeProperty(String s) {
44 return;
45 }
46
47 static boolean diditwork;
48
49 static {
50 makeProperty("diditwork");
51 }
52
53 static boolean get__diditwork() { return true; }
54 static void set__diditwork(boolean f) {}
55
56 static public void main(String []args) {
57 if (diditwork)
58 System.out.println("Property ok");
59 else
60 System.out.println("Property failed");
61 }
62
63 public void run (Lexer lexer) throws Exception {
64 lexer.match(Token.END_OF_OPTS);
65 ClassInfo [] withprops = lexer.getClasses();
66 lexer.match(':');
67 ClassInfo [] usesprops = lexer.getClasses();
68 lexer.term();
69
70 run (withprops, usesprops);
71 }
72
73 public void run (ClassInfo[] withprops, ClassInfo[] usesprops) throws ClassFileException, ElementNotFoundException
74 {
75 Vector fieldsv = new Vector();
76
77 for (int i = 0; i < withprops.length; i++) {
78 ClassInfo cr = withprops[i];
79 MethodInfo clinit = cr.findMethod("<clinit>", (String ) null);
80 if (clinit == null || clinit.code == null) continue;
81 Instruction instr;
82 for (instr = clinit.code.first(); instr != null; instr = instr.next) {
83 if ( instr.opCode() == Instruction.AOP_SPUSH &&
84 instr.next != null &&
85 instr.next.opCode() == Instruction.OP_INVOKESTATIC &&
86 instr.next.classRef().equals("jbet/cmd/property") &&
87 instr.next.elemName().equals("makeProperty") &&
88 instr.next.descriptor().equals("(Ljava/lang/String;)V") ){
89
90 FieldInfo fi = cr.getField(instr.immediate_s());
91 fieldsv.addElement(fi);
92 Jbet.info.println("property " + cr.name()+ "." +instr.immediate_s());
94
97 }
99 }
100 }
101
102 final FieldInfo [] fields = new FieldInfo [ fieldsv.size() ];
103 fieldsv.toArray (fields);
104
105 final Instruction [] reads = new Instruction [ fieldsv.size() ];
106 final Instruction [] writes = new Instruction [ fieldsv.size() ];
107
108 for (int i = 0; i < reads.length; i++) {
109 reads[i] = new Instruction().setInvoke
110 (fields[i].cr.name(),
111 "get__" + fields[i].name,
112 new Descriptor (fields[i].type),
113 fields[i].isStatic());
114 writes[i] = new Instruction().setInvoke
115 (fields[i].cr.name(),
116 "set__" + fields[i].name,
117 new Descriptor (fields[i].type, Type.VOID),
118 fields[i].isStatic());
119 }
120
121 class _util {
122 public _util() {}
123 public boolean isAccessMethod(MethodInfo mi, int k) {
124 FieldInfo fi = fields[k];
125 Instruction read = reads[k];
126 Instruction write = writes[k];
127 if (mi.cr != fi.cr) return false;
128 if (mi.name.equals(read.elemName()) &&
129 mi.descriptor.equals(read.descriptor())) return true;
130 if (mi.name.equals(write.elemName()) &&
131 mi.descriptor.equals(write.descriptor())) return true;
132 return false;
133 }
134 };
135 _util util = new _util();
136
137 for (int i = 0; i < usesprops.length; i++) {
138 ClassInfo cr = usesprops[i];
139 for (int j = 0; j < cr.numMethods(); j++) {
140 MethodInfo mi = cr.methodAt(j);
141 if (mi.code == null) continue;
142 Instruction instr = mi.code.first();
143 INSTRLOOP:
144 for (; instr != null; instr = instr.next) {
145 if (instr.isGet())
146 for (int k = 0; k < fields.length; k++) {
147 FieldInfo fi = fields[k];
148 if (util.isAccessMethod(mi,k)) continue;
149 if ( fi.cr.name().equals(instr.classRef()) &&
150 fi.name.equals(instr.elemName())) {
151 instr.copy( reads[k] );
152 cr.setDirty();
153 continue INSTRLOOP;
154 }
155 }
156 else if (instr.isPut())
157 for (int k = 0; k < fields.length; k++) {
158 FieldInfo fi = fields[k];
159 if (util.isAccessMethod(mi,k)) continue;
160 if ( fi.cr.name().equals(instr.classRef()) &&
161 fi.name.equals(instr.elemName())) {
162 instr.copy( writes[k] );
163 cr.setDirty();
164 continue INSTRLOOP;
165 }
166 }
167 }
168 }
169 }
170 Jbet.info.println("Done property");
171 }
172
173 }
174
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