1 | |
|
2 | |
|
3 | |
|
4 | |
|
5 | |
|
6 | |
|
7 | |
|
8 | |
|
9 | |
|
10 | |
|
11 | |
|
12 | |
|
13 | |
|
14 | |
|
15 | |
|
16 | |
|
17 | |
package org.apache.commons.nabla.forward.analysis; |
18 | |
|
19 | |
import java.io.IOException; |
20 | |
import java.io.InputStream; |
21 | |
import java.lang.reflect.Field; |
22 | |
import java.util.Set; |
23 | |
|
24 | |
import org.apache.commons.math3.analysis.UnivariateFunction; |
25 | |
import org.apache.commons.math3.analysis.differentiation.UnivariateDifferentiableFunction; |
26 | |
import org.apache.commons.nabla.DifferentiationException; |
27 | |
import org.apache.commons.nabla.NablaMessages; |
28 | |
import org.objectweb.asm.ClassReader; |
29 | |
import org.objectweb.asm.Label; |
30 | |
import org.objectweb.asm.Opcodes; |
31 | |
import org.objectweb.asm.Type; |
32 | |
import org.objectweb.asm.tree.ClassNode; |
33 | |
import org.objectweb.asm.tree.FieldNode; |
34 | |
import org.objectweb.asm.tree.MethodNode; |
35 | |
|
36 | |
|
37 | |
|
38 | |
|
39 | |
|
40 | |
|
41 | |
|
42 | |
|
43 | |
|
44 | |
|
45 | |
|
46 | |
|
47 | |
|
48 | |
|
49 | |
|
50 | |
|
51 | |
|
52 | |
|
53 | |
|
54 | |
|
55 | |
public class ClassDifferentiator { |
56 | |
|
57 | |
|
58 | |
private static final String PRIMITIVE_FIELD = "primitive"; |
59 | |
|
60 | |
|
61 | |
private static final String INIT = "<init>"; |
62 | |
|
63 | |
|
64 | |
private final Set<String> mathClasses; |
65 | |
|
66 | |
|
67 | |
private final Class<? extends UnivariateFunction> primitiveClass; |
68 | |
|
69 | |
|
70 | |
private final ClassNode primitiveNode; |
71 | |
|
72 | |
|
73 | |
private final ClassNode classNode; |
74 | |
|
75 | |
|
76 | |
|
77 | |
|
78 | |
|
79 | |
|
80 | |
|
81 | |
|
82 | |
public ClassDifferentiator(final Class<? extends UnivariateFunction> primitiveClass, |
83 | |
final Set<String> mathClasses) |
84 | 67 | throws DifferentiationException, IOException { |
85 | |
|
86 | |
|
87 | 67 | this.primitiveClass = primitiveClass; |
88 | 67 | final String classResourceName = "/" + primitiveClass.getName().replace('.', '/') + ".class"; |
89 | 67 | final InputStream stream = primitiveClass.getResourceAsStream(classResourceName); |
90 | 67 | final ClassReader reader = new ClassReader(stream); |
91 | 67 | primitiveNode = new ClassNode(Opcodes.ASM4); |
92 | 67 | reader.accept(primitiveNode, ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES); |
93 | 67 | this.mathClasses = mathClasses; |
94 | 67 | classNode = new ClassNode(Opcodes.ASM4); |
95 | |
|
96 | |
|
97 | 67 | final Class<UnivariateFunction> uFuncClass = UnivariateFunction.class; |
98 | 67 | boolean isDifferentiable = false; |
99 | 67 | for (String interf : primitiveNode.interfaces) { |
100 | 67 | final String interfName = interf.replace('/', '.'); |
101 | 67 | Class<?> interfClass = null; |
102 | |
try { |
103 | 67 | interfClass = Class.forName(interfName); |
104 | 0 | } catch (ClassNotFoundException cnfe) { |
105 | |
|
106 | |
|
107 | 0 | throw new DifferentiationException(NablaMessages.INTERFACE_NOT_FOUND_WHILE_DIFFERENTIATING, |
108 | |
interfName, primitiveNode.name); |
109 | 67 | } |
110 | 67 | if (interfClass != null) { |
111 | 67 | isDifferentiable = isDifferentiable || uFuncClass.isAssignableFrom(interfClass); |
112 | |
} |
113 | 67 | } |
114 | |
|
115 | 67 | if (!isDifferentiable) { |
116 | 0 | throw new DifferentiationException(NablaMessages.CLASS_DOES_NOT_IMPLEMENT_INTERFACE, |
117 | |
primitiveNode.name, uFuncClass.getName()); |
118 | |
} |
119 | |
|
120 | |
|
121 | 67 | classNode.visit(primitiveNode.version, Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC, |
122 | |
primitiveNode.name + "_NablaForwardModeUnivariateDerivative", |
123 | |
null, Type.getType(Object.class).getInternalName(), |
124 | |
new String[] { |
125 | |
UnivariateDifferentiableFunction.class.getName().replace('.', '/') |
126 | |
}); |
127 | |
|
128 | |
|
129 | 67 | addPrimitiveField(); |
130 | 67 | addConstructor(); |
131 | 67 | addGetPrimitiveFieldMethod(); |
132 | |
|
133 | 67 | } |
134 | |
|
135 | |
|
136 | |
|
137 | |
|
138 | |
|
139 | |
|
140 | |
|
141 | |
|
142 | |
public void differentiateMethod(final String name, final String primitiveDesc, |
143 | |
final String derivativeDesc) |
144 | |
throws DifferentiationException { |
145 | |
|
146 | 67 | for (final MethodNode method : primitiveNode.methods) { |
147 | 192 | if (method.name.equals(name) && method.desc.equals(primitiveDesc)) { |
148 | |
|
149 | 67 | final MethodDifferentiator differentiator = |
150 | |
new MethodDifferentiator(mathClasses, classNode.name); |
151 | 67 | differentiator.differentiate(primitiveNode.name, method); |
152 | 67 | classNode.methods.add(method); |
153 | |
|
154 | 192 | } |
155 | |
} |
156 | 67 | } |
157 | |
|
158 | |
|
159 | |
|
160 | |
|
161 | |
|
162 | |
public ClassNode getDerivedClass() { |
163 | 67 | return classNode; |
164 | |
} |
165 | |
|
166 | |
|
167 | |
|
168 | |
private void addPrimitiveField() { |
169 | 67 | final FieldNode primitiveField = |
170 | |
new FieldNode(Opcodes.ACC_PRIVATE | Opcodes.ACC_FINAL | Opcodes.ACC_SYNTHETIC, |
171 | |
PRIMITIVE_FIELD, Type.getDescriptor(primitiveClass), null, null); |
172 | 67 | classNode.fields.add(primitiveField); |
173 | 67 | } |
174 | |
|
175 | |
|
176 | |
|
177 | |
private void addConstructor() { |
178 | 67 | final MethodNode constructor = |
179 | |
new MethodNode(Opcodes.ACC_PUBLIC | Opcodes.ACC_SYNTHETIC, INIT, |
180 | |
Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(primitiveClass)), |
181 | |
null, null); |
182 | 67 | constructor.visitVarInsn(Opcodes.ALOAD, 0); |
183 | 67 | constructor.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getType(Object.class).getInternalName(), |
184 | |
INIT, "()V"); |
185 | 67 | constructor.visitVarInsn(Opcodes.ALOAD, 0); |
186 | 67 | constructor.visitVarInsn(Opcodes.ALOAD, 1); |
187 | 67 | constructor.visitFieldInsn(Opcodes.PUTFIELD, classNode.name, PRIMITIVE_FIELD, |
188 | |
Type.getDescriptor(primitiveClass)); |
189 | 67 | constructor.visitInsn(Opcodes.RETURN); |
190 | 67 | constructor.visitMaxs(0, 0); |
191 | 67 | classNode.methods.add(constructor); |
192 | 67 | } |
193 | |
|
194 | |
|
195 | |
|
196 | |
private void addGetPrimitiveFieldMethod() { |
197 | 67 | final MethodNode method = |
198 | |
new MethodNode(Opcodes.ACC_PRIVATE | Opcodes.ACC_SYNTHETIC, "getPrimitiveField", |
199 | |
Type.getMethodDescriptor(Type.getType(Object.class), Type.getType(String.class)), |
200 | |
null, null); |
201 | 67 | final Label start = new Label(); |
202 | 67 | final Label end = new Label(); |
203 | 67 | method.visitTryCatchBlock(start, end, end, Type.getInternalName(IllegalAccessException.class)); |
204 | 67 | method.visitTryCatchBlock(start, end, end, Type.getInternalName(NoSuchFieldException.class)); |
205 | 67 | method.visitLabel(start); |
206 | 67 | method.visitLdcInsn(Type.getType(primitiveClass)); |
207 | 67 | method.visitVarInsn(Opcodes.ALOAD, 1); |
208 | 67 | method.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Class.class), |
209 | |
"getDeclaredField", |
210 | |
Type.getMethodDescriptor(Type.getType(Field.class), Type.getType(String.class))); |
211 | 67 | method.visitVarInsn(Opcodes.ASTORE, 2); |
212 | 67 | method.visitVarInsn(Opcodes.ALOAD, 2); |
213 | 67 | method.visitInsn(Opcodes.ICONST_1); |
214 | 67 | method.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Field.class), |
215 | |
"setAccessible", |
216 | |
Type.getMethodDescriptor(Type.VOID_TYPE, Type.BOOLEAN_TYPE)); |
217 | 67 | method.visitVarInsn(Opcodes.ALOAD, 2); |
218 | 67 | method.visitVarInsn(Opcodes.ALOAD, 0); |
219 | 67 | method.visitFieldInsn(Opcodes.GETFIELD, classNode.name, PRIMITIVE_FIELD, |
220 | |
Type.getDescriptor(primitiveClass)); |
221 | 67 | method.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(Field.class), |
222 | |
"get", |
223 | |
Type.getMethodDescriptor(Type.getType(Object.class), Type.getType(Object.class))); |
224 | 67 | method.visitInsn(Opcodes.ARETURN); |
225 | 67 | method.visitLabel(end); |
226 | 67 | method.visitVarInsn(Opcodes.ASTORE, 2); |
227 | 67 | method.visitTypeInsn(Opcodes.NEW, Type.getInternalName(RuntimeException.class)); |
228 | 67 | method.visitInsn(Opcodes.DUP); |
229 | 67 | method.visitVarInsn(Opcodes.ALOAD, 2); |
230 | 67 | method.visitMethodInsn(Opcodes.INVOKESPECIAL, Type.getInternalName(RuntimeException.class), |
231 | |
INIT, Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(Throwable.class))); |
232 | 67 | method.visitInsn(Opcodes.ATHROW); |
233 | 67 | classNode.methods.add(method); |
234 | 67 | } |
235 | |
|
236 | |
} |