/
ClassFileBuilder.java
161 lines (126 loc) · 6.35 KB
/
ClassFileBuilder.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
package org.isk.jvmhardcore.pjba.builder;
import org.isk.jvmhardcore.pjba.structure.ClassFile;
import org.isk.jvmhardcore.pjba.structure.Field;
import org.isk.jvmhardcore.pjba.structure.Method;
import org.isk.jvmhardcore.pjba.structure.attribute.ConstantValue;
import org.isk.jvmhardcore.pjba.util.DescriptorCounter;
public class ClassFileBuilder {
private ClassFile classFile;
private MethodBuilder methodBuilder;
public ClassFileBuilder(final int classModifiers, final String fullyQualifiedName) {
super();
this.classFile = new ClassFile(fullyQualifiedName);
this.classFile.addAccessFlags(classModifiers);
}
public ClassFileBuilder newField(final int fieldModifiers, final String fieldName, final String fieldDescriptor) {
this.createNewField(fieldModifiers, fieldName, fieldDescriptor);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final int value) {
final int constantIntegerIndex = this.classFile.addConstantInteger(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final long value) {
final int constantIntegerIndex = this.classFile.addConstantLong(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final float value) {
final int constantIntegerIndex = this.classFile.addConstantFloat(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final double value) {
final int constantIntegerIndex = this.classFile.addConstantDouble(value);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
public ClassFileBuilder newConstantField(final int fieldModifiers,
final String fieldName,
final String fieldDescriptor,
final String value) {
final int valueUtf8Index = this.classFile.addConstantUTF8(value);
final int constantIntegerIndex = this.classFile.addConstantString(valueUtf8Index);
final ConstantValue constantValue = this.createConstantValue(constantIntegerIndex);
final Field field = this.createNewField(fieldModifiers | Field.MODIFIER_FINAL, fieldName, fieldDescriptor);
field.addAttibute(constantValue);
return this;
}
private Field createNewField(final int fieldModifiers, final String fieldName, final String fieldDescriptor) {
final int nameIndex = this.classFile.addConstantUTF8(fieldName);
final int descriptorIndex = this.classFile.addConstantUTF8(fieldDescriptor);
final Field field = new Field();
field.setNameIndex(nameIndex);
field.setDescriptorIndex(descriptorIndex);
field.setAccessFlags(fieldModifiers);
this.classFile.addField(field);
return field;
}
private ConstantValue createConstantValue(final int constantIndex) {
final int constantValueAttributeIndex = this.classFile.addConstantUTF8(ConstantValue.ATTRIBUTE_NAME);
final ConstantValue constantValue = new ConstantValue(constantValueAttributeIndex);
constantValue.setConstantValueIndex(constantIndex);
return constantValue;
}
public MethodBuilder newMethod(final int methodModifiers,
final String methodName,
final String methodDescriptor,
final boolean eagerConstruction) {
if (this.methodBuilder != null) {
this.methodBuilder.buildMethod();
}
final int methodIndex = this.classFile.addConstantUTF8(methodName);
final int descriptorIndex = this.classFile.addConstantUTF8(methodDescriptor);
final Method method = new Method();
method.setNameIndex(methodIndex);
method.setDescriptorIndex(descriptorIndex);
method.setAccessFlags(methodModifiers);
this.classFile.addMethod(method);
int locals = DescriptorCounter.methodsDescriptorParamsUnits(methodDescriptor);
// Count this
if ((Method.MODIFIER_STATIC & methodModifiers) != Method.MODIFIER_STATIC) {
locals++;
}
this.methodBuilder = new MethodBuilder(this, method, locals, eagerConstruction);
return this.methodBuilder;
}
public MethodBuilder newMethod(final int methodModifiers, final String methodName, final String methodDescriptor) {
return this.newMethod(methodModifiers, methodName, methodDescriptor, true);
}
public MethodBuilder staticBlock(boolean eagerConstruction) {
return this.newMethod(Method.MODIFIER_STATIC, "<clinit>", "()V", eagerConstruction);
}
public MethodBuilder staticBlock() {
return this.staticBlock(true);
}
public ClassFile build() {
if (this.methodBuilder != null) {
this.methodBuilder.buildMethod();
}
return this.classFile;
}
protected ClassFile getClassFile() {
return this.classFile;
}
}