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1
16
17 package com.google.inject.util;
18
19 import java.io.IOException  ;
20 import java.io.InputStream ;
21 import java.lang.reflect.*;
22 import java.util.HashMap ;
23 import java.util.Map ;
24 import org.objectweb.asm.*;
25 import org.objectweb.asm.Type;
26
27
32 public class LineNumbers {
33
34 private final Class cls;
35 private Map <String , Integer > lines = new HashMap <String , Integer >();
36 private String source;
37 private int firstLine = Integer.MAX_VALUE;
38
39
47 public LineNumbers(Class cls) throws IOException {
48 this.cls = cls;
49 InputStream in = cls
50 .getResourceAsStream("/" + cls.getName().replace('.', '/') + ".class");
51 if (in == null) {
52 throw new IllegalArgumentException ("Cannot find bytecode for " + cls);
53 }
54 new ClassReader(in).accept(new LineNumberReader(), 0);
55 }
56
57
62 public String getSource() {
63 return source;
64 }
65
66
75 public Integer getLineNumber(Member member) {
76 if (!cls.equals(member.getDeclaringClass())) {
77 throw new IllegalArgumentException ("Member " + member + " belongs to "
78 + member.getDeclaringClass() + ", not " + cls);
79 }
80 return lines.get(getKey(member));
81 }
82
83
86 public int getFirstLine() {
87 return firstLine == Integer.MAX_VALUE ? 1 : firstLine;
88 }
89
90 private static String getKey(Member member) {
91 if (member instanceof Field) {
92 return member.getName();
93 }
94 else if (member instanceof Method) {
95 return member.getName() + Type.getMethodDescriptor((Method) member);
96 }
97 else {
98 return "<init>" + Type.getConstructorDescriptor((Constructor) member);
99 }
100 }
101
102 private class LineNumberReader implements ClassVisitor, MethodVisitor {
103
104 private int line = -1;
105 private String pendingMethod;
106 private String name;
107
108 public void visit(int version, int access, String name, String signature,
109 String superName, String [] interfaces) {
110 this.name = name;
111 }
112
113 public MethodVisitor visitMethod(int access, String name, String desc,
114 String signature, String [] exceptions) {
115 if ((access & Opcodes.ACC_PRIVATE) != 0) {
116 return null;
117 }
118 pendingMethod = name + desc;
119 line = -1;
120 return this;
121 }
122
123 public void visitSource(String source, String debug) {
124 LineNumbers.this.source = source;
125 }
126
127 public void visitLineNumber(int line, Label start) {
128 if (line < firstLine) {
129 firstLine = line;
130 }
131
132 this.line = line;
133 if (pendingMethod != null) {
134 lines.put(pendingMethod, line);
135 pendingMethod = null;
136 }
137 }
138
139 public void visitFieldInsn(int opcode, String owner, String name,
140 String desc) {
141 if (opcode == Opcodes.PUTFIELD && this.name.equals(owner)
142 && !lines.containsKey(name) && line != -1) {
143 lines.put(name, line);
144 }
145 }
146
147 public void visitEnd() {
148 }
149
150 public void visitInnerClass(String name, String outerName, String innerName,
151 int access) {
152 }
153
154 public void visitOuterClass(String owner, String name, String desc) {
155 }
156
157 public void visitAttribute(Attribute attr) {
158 }
159
160 public FieldVisitor visitField(int access, String name, String desc,
161 String signature, Object value) {
162 return null;
163 }
164
165 public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
166 return null;
167 }
168
169 public AnnotationVisitor visitAnnotationDefault() {
170 return null;
171 }
172
173 public AnnotationVisitor visitParameterAnnotation(int parameter,
174 String desc, boolean visible) {
175 return null;
176 }
177
178 public void visitCode() {
179 }
180
181 public void visitFrame(int type, int nLocal, Object [] local, int nStack,
182 Object [] stack) {
183 }
184
185 public void visitIincInsn(int var, int increment) {
186 }
187
188 public void visitInsn(int opcode) {
189 }
190
191 public void visitIntInsn(int opcode, int operand) {
192 }
193
194 public void visitJumpInsn(int opcode, Label label) {
195 }
196
197 public void visitLabel(Label label) {
198 }
199
200 public void visitLdcInsn(Object cst) {
201 }
202
203 public void visitLocalVariable(String name, String desc, String signature,
204 Label start, Label end, int index) {
205 }
206
207 public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) {
208 }
209
210 public void visitMaxs(int maxStack, int maxLocals) {
211 }
212
213 public void visitMethodInsn(int opcode, String owner, String name,
214 String desc) {
215 }
216
217 public void visitMultiANewArrayInsn(String desc, int dims) {
218 }
219
220 public void visitTableSwitchInsn(int min, int max, Label dflt,
221 Label[] labels) {
222 }
223
224 public void visitTryCatchBlock(Label start, Label end, Label handler,
225 String type) {
226 }
227
228 public void visitTypeInsn(int opcode, String desc) {
229 }
230
231 public void visitVarInsn(int opcode, int var) {
232 }
233 }
234 }
235 |
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