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* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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//Portions Copyright [2016-2019] [Payara Foundation and/or its affiliates]
package com.sun.ejb.codegen;
import org.objectweb.asm.*;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.ReflectPermission;
import java.security.AccessController;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.security.ProtectionDomain;
public class AsmSerializableBeanGenerator implements Opcodes {
private static final int INTF_FLAGS = ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES;
private byte[] classData = null;
private Class loadedClass = null;
private ClassLoader loader;
private Class baseClass;
private String subclassName;
public AsmSerializableBeanGenerator(ClassLoader loader, Class baseClass, String serializableSubclassName) {
this.loader = loader;
this.baseClass = baseClass;
subclassName = serializableSubclassName;
}
public String getSerializableSubclassName() {
return subclassName;
}
public Class generateSerializableSubclass()
throws Exception {
try {
loadedClass = loader.loadClass(subclassName);
return loadedClass;
} catch(ClassNotFoundException e) {
// Not loaded yet. Just continue
}
ClassWriter cw = new ClassWriter(INTF_FLAGS);
//ClassVisitor tv = //(_debug)
//new TraceClassVisitor(cw, new PrintWriter(System.out));
ClassVisitor tv = cw;
String subclassInternalName = subclassName.replace('.', '/');
String[] interfaces = new String[] {
Type.getType(Serializable.class).getInternalName()
};
tv.visit(V1_8, ACC_PUBLIC,
subclassInternalName, null,
Type.getType(baseClass).getInternalName(), interfaces);
// Generate constructor. The EJB spec only allows no-arg constructors, but
// JSR 299 added requirements that allow a single constructor to define
// parameters injected by CDI.
Constructor[] ctors = baseClass.getConstructors();
Constructor ctorWithParams = null;
for(Constructor ctor : ctors) {
if (ctor.getParameterTypes().length == 0) {
ctorWithParams = null; //exists the no-arg ctor, use it
break;
} else if(ctorWithParams == null) {
ctorWithParams = ctor;
}
}
int numArgsToPass = 1; // default is 1 to just handle 'this'
String paramTypeString = "()V";
if( ctorWithParams != null ) {
Class[] paramTypes = ctorWithParams.getParameterTypes();
numArgsToPass = paramTypes.length + 1;
paramTypeString = Type.getConstructorDescriptor(ctorWithParams);
}
MethodVisitor ctorv = tv.visitMethod(ACC_PUBLIC, "", paramTypeString, null, null);
for(int i = 0; i < numArgsToPass; i++) {
ctorv.visitVarInsn(ALOAD, i);
}
ctorv.visitMethodInsn(INVOKESPECIAL, Type.getType(baseClass).getInternalName(), "",
paramTypeString);
ctorv.visitInsn(RETURN);
ctorv.visitMaxs(numArgsToPass, numArgsToPass);
if (ctorWithParams != null) {
for (Annotation annotation : ctorWithParams.getAnnotations()) {
ctorv.visitAnnotation(Type.getDescriptor(annotation.annotationType()), true);
}
for (int i = 0; i < ctorWithParams.getParameterTypes().length; i++) {
for (Annotation parameterAnnotation : ctorWithParams.getParameterAnnotations()[i]) {
ctorv.visitParameterAnnotation(i, Type.getDescriptor(parameterAnnotation.annotationType()), true);
}
}
}
MethodVisitor cv = cw.visitMethod(ACC_PRIVATE, "writeObject", "(Ljava/io/ObjectOutputStream;)V", null, new String[] { "java/io/IOException" });
cv.visitVarInsn(ALOAD, 0);
cv.visitVarInsn(ALOAD, 1);
cv.visitMethodInsn(INVOKESTATIC, "com/sun/ejb/EJBUtils", "serializeObjectFields", "(Ljava/lang/Object;Ljava/io/ObjectOutputStream;)V");
cv.visitInsn(RETURN);
cv.visitMaxs(2, 2);
cv = cw.visitMethod(ACC_PRIVATE, "readObject", "(Ljava/io/ObjectInputStream;)V", null, new String[] { "java/io/IOException", "java/lang/ClassNotFoundException" });
cv.visitVarInsn(ALOAD, 0);
cv.visitVarInsn(ALOAD, 1);
cv.visitMethodInsn(INVOKESTATIC, "com/sun/ejb/EJBUtils", "deserializeObjectFields", "(Ljava/lang/Object;Ljava/io/ObjectInputStream;)V");
cv.visitInsn(RETURN);
cv.visitMaxs(2, 2);
/**
Type[] eTypes = new Type[] { Type.getType(java.io.IOException.class)};
Method writeObjMethod = Method.getMethod("void writeObject (java.io.ObjectOutputStream)");
GeneratorAdapter writeObjMethodAdapter =
new GeneratorAdapter(ACC_PRIVATE, writeObjMethod, null, eTypes, tv);
Type ejbUtilsType = Type.getType(com.sun.ejb.EJBUtils.class);
Method ejbUtilsWrite = Method.getMethod
("void serializeObjectFields (java.lang.Class, java.lang.Object, java.lang.Object)");
writeObjMethodAdapter.push(Type.getType(ejbClass));
writeObjMethodAdapter.loadThis();
writeObjMethodAdapter.loadArg(0);
writeObjMethodAdapter.invokeStatic( ejbUtilsType, ejbUtilsWrite);
writeObjMethodAdapter.endMethod();
//
eTypes = new Type[] { Type.getType(java.io.IOException.class),
Type.getType(java.lang.ClassNotFoundException.class)};
Method readObjMethod = Method.getMethod("void readObject (java.io.ObjectInputStream)");
GeneratorAdapter readObjMethodAdapter =
new GeneratorAdapter(ACC_PRIVATE, readObjMethod, null, eTypes, tv);
Method ejbUtilsRead = Method.getMethod
("void deserializeObjectFields (java.lang.Class, java.lang.Object, java.lang.Object)");
readObjMethodAdapter.push(Type.getType(ejbClass));
readObjMethodAdapter.loadThis();
readObjMethodAdapter.loadArg(0);
readObjMethodAdapter.invokeStatic( ejbUtilsType, ejbUtilsRead);
readObjMethodAdapter.endMethod();
**/
tv.visitEnd();
classData = cw.toByteArray();
loadedClass = (Class) java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction() {
public java.lang.Object run() {
return makeClass(subclassName, classData, baseClass.getProtectionDomain(), loader);
}
}
);
return loadedClass;
}
// A Method for the protected ClassLoader.defineClass method, which we access
// using reflection. This requires the supressAccessChecks permission.
private static final java.lang.reflect.Method defineClassMethod = AccessController.doPrivileged(
new PrivilegedAction() {
public java.lang.reflect.Method run() {
try {
java.lang.reflect.Method meth = ClassLoader.class.getDeclaredMethod(
"defineClass", String.class,
byte[].class, int.class, int.class,
ProtectionDomain.class ) ;
meth.setAccessible( true ) ;
return meth ;
} catch (Exception exc) {
throw new RuntimeException(
"Could not find defineClass method!", exc ) ;
}
}
}
) ;
private static final Permission accessControlPermission =
new ReflectPermission( "suppressAccessChecks" ) ;
// This requires a permission check
private Class makeClass( String name, byte[] def, ProtectionDomain pd,
ClassLoader loader ) {
SecurityManager sman = System.getSecurityManager() ;
if (sman != null)
sman.checkPermission( accessControlPermission ) ;
try {
return (Class)defineClassMethod.invoke( loader,
name, def, 0, def.length, pd ) ;
} catch (Exception exc) {
throw new RuntimeException( "Could not invoke defineClass!",
exc ) ;
}
}
}
