protected void enhanceAttributesAccess(
CtClass managedCtClass,
IdentityHashMap<String, PersistentAttributeAccessMethods> attributeDescriptorMap) {
final ConstPool constPool = managedCtClass.getClassFile().getConstPool();
for (Object oMethod : managedCtClass.getClassFile().getMethods()) {
final MethodInfo methodInfo = (MethodInfo) oMethod;
final String methodName = methodInfo.getName();
// skip methods added by enhancement and abstract methods (methods without any code)
if (methodName.startsWith("$$_hibernate_") || methodInfo.getCodeAttribute() == null) {
continue;
}
try {
final CodeIterator itr = methodInfo.getCodeAttribute().iterator();
while (itr.hasNext()) {
final int index = itr.next();
final int op = itr.byteAt(index);
if (op != Opcode.PUTFIELD && op != Opcode.GETFIELD) {
continue;
}
final String fieldName = constPool.getFieldrefName(itr.u16bitAt(index + 1));
final PersistentAttributeAccessMethods attributeMethods =
attributeDescriptorMap.get(fieldName);
// its not a field we have enhanced for interception, so skip it
if (attributeMethods == null) {
continue;
}
// System.out.printf( "Transforming access to field [%s] from method [%s]%n", fieldName,
// methodName );
log.debugf("Transforming access to field [%s] from method [%s]", fieldName, methodName);
if (op == Opcode.GETFIELD) {
final int methodIndex = MethodWriter.addMethod(constPool, attributeMethods.getReader());
itr.writeByte(Opcode.INVOKESPECIAL, index);
itr.write16bit(methodIndex, index + 1);
} else {
final int methodIndex = MethodWriter.addMethod(constPool, attributeMethods.getWriter());
itr.writeByte(Opcode.INVOKESPECIAL, index);
itr.write16bit(methodIndex, index + 1);
}
}
methodInfo.getCodeAttribute().setAttribute(MapMaker.make(classPool, methodInfo));
} catch (BadBytecode bb) {
final String msg =
String.format(
"Unable to perform field access transformation in method [%s]", methodName);
throw new EnhancementException(msg, bb);
}
}
}
/* 94: */
/* 95: */ protected int match(
int c, int pos, CodeIterator iterator, int typedesc, ConstPool cp)
/* 96: */ throws BadBytecode
/* 97: */ {
/* 98:110 */ if (this.newIndex == 0)
/* 99: */ {
/* 100:111 */ int nt = cp.addNameAndTypeInfo(cp.addUtf8Info(this.newMethodname), typedesc);
/* 101: */
/* 102:113 */ int ci = cp.addClassInfo(this.newClassname);
/* 103:114 */ if (c == 185)
/* 104: */ {
/* 105:115 */ this.newIndex = cp.addInterfaceMethodrefInfo(ci, nt);
/* 106: */ }
/* 107: */ else
/* 108: */ {
/* 109:117 */ if ((this.newMethodIsPrivate) && (c == 182)) {
/* 110:118 */ iterator.writeByte(183, pos);
/* 111: */ }
/* 112:120 */ this.newIndex = cp.addMethodrefInfo(ci, nt);
/* 113: */ }
/* 114:123 */ this.constPool = cp;
/* 115: */ }
/* 116:126 */ iterator.write16bit(this.newIndex, pos + 1);
/* 117:127 */ return pos;
/* 118: */ }
/**
* @param lessThan If the index of the local variable is less than this value, it does not change.
* Otherwise, the index is increased.
* @param delta the indexes of the local variables are increased by this value.
*/
private static void shiftIndex(CodeIterator ci, int lessThan, int delta) throws BadBytecode {
int index = ci.next();
int opcode = ci.byteAt(index);
if (opcode < ILOAD) return;
else if (opcode < IASTORE) {
if (opcode < ILOAD_0) {
// iload, lload, fload, dload, aload
shiftIndex8(ci, index, opcode, lessThan, delta);
} else if (opcode < IALOAD) {
// iload_0, ..., aload_3
shiftIndex0(ci, index, opcode, lessThan, delta, ILOAD_0, ILOAD);
} else if (opcode < ISTORE) return;
else if (opcode < ISTORE_0) {
// istore, lstore, ...
shiftIndex8(ci, index, opcode, lessThan, delta);
} else {
// istore_0, ..., astore_3
shiftIndex0(ci, index, opcode, lessThan, delta, ISTORE_0, ISTORE);
}
} else if (opcode == IINC) {
int var = ci.byteAt(index + 1);
if (var < lessThan) return;
var += delta;
if (var < 0x100) ci.writeByte(var, index + 1);
else {
int plus = (byte) ci.byteAt(index + 2);
int pos = ci.insertExGap(3);
ci.writeByte(WIDE, pos - 3);
ci.writeByte(IINC, pos - 2);
ci.write16bit(var, pos - 1);
ci.write16bit(plus, pos + 1);
}
} else if (opcode == RET) shiftIndex8(ci, index, opcode, lessThan, delta);
else if (opcode == WIDE) {
int var = ci.u16bitAt(index + 2);
if (var < lessThan) return;
var += delta;
ci.write16bit(var, index + 2);
}
}
protected void enhanceAttributesAccess(Map<String, CtField> fieldsMap, CtClass managedCtClass)
throws Exception {
final ConstPool constPool = managedCtClass.getClassFile().getConstPool();
final ClassPool classPool = managedCtClass.getClassPool();
for (Object oMethod : managedCtClass.getClassFile().getMethods()) {
final MethodInfo methodInfo = (MethodInfo) oMethod;
final String methodName = methodInfo.getName();
// skip methods added by enhancement, and abstract methods (methods without any code)
if (methodName.startsWith(DROOLS_PREFIX) || methodInfo.getCodeAttribute() == null) {
continue;
}
try {
final CodeIterator itr = methodInfo.getCodeAttribute().iterator();
while (itr.hasNext()) {
final int index = itr.next();
final int op = itr.byteAt(index);
if (op != Opcode.PUTFIELD && op != Opcode.GETFIELD) {
continue;
}
final String fieldName = constPool.getFieldrefName(itr.u16bitAt(index + 1));
CtField ctField = fieldsMap.get(fieldName);
if (ctField == null) {
continue;
}
// if we are in constructors, only need to intercept assignment statement for Reactive
// Collection/List/... (regardless they may be final)
if (methodInfo.isConstructor() && !(isCtFieldACollection(ctField))) {
continue;
}
if (op == Opcode.PUTFIELD) {
// addMethod is a safe add, if constant already present it return the existing value
// without adding.
final int methodIndex = addMethod(constPool, writeMethods.get(fieldName));
itr.writeByte(Opcode.INVOKEVIRTUAL, index);
itr.write16bit(methodIndex, index + 1);
}
}
methodInfo.getCodeAttribute().setAttribute(MapMaker.make(classPool, methodInfo));
} catch (BadBytecode bb) {
final String msg =
String.format(
"Unable to perform field access transformation in method [%s]", methodName);
throw new Exception(msg, bb);
}
}
}
private static void shiftIndex8(CodeIterator ci, int index, int opcode, int lessThan, int delta)
throws BadBytecode {
int var = ci.byteAt(index + 1);
if (var < lessThan) return;
var += delta;
if (var < 0x100) ci.writeByte(var, index + 1);
else {
int pos = ci.insertExGap(2);
ci.writeByte(WIDE, pos - 2);
ci.writeByte(opcode, pos - 1);
ci.write16bit(var, pos);
}
}
private static void shiftIndex0(
CodeIterator ci, int index, int opcode, int lessThan, int delta, int opcode_i_0, int opcode_i)
throws BadBytecode {
int var = (opcode - opcode_i_0) % 4;
if (var < lessThan) return;
var += delta;
if (var < 4) ci.writeByte(opcode + delta, index);
else {
opcode = (opcode - opcode_i_0) / 4 + opcode_i;
if (var < 0x100) {
int pos = ci.insertExGap(1);
ci.writeByte(opcode, pos - 1);
ci.writeByte(var, pos);
} else {
int pos = ci.insertExGap(3);
ci.writeByte(WIDE, pos - 1);
ci.writeByte(opcode, pos);
ci.write16bit(var, pos + 1);
}
}
}
/**
* Replace access to fields of entities (for example, entity.field) with a call to the enhanced
* getter / setter (in this example, entity.$$_hibernate_read_field()). It's assumed that the
* target entity is enhanced as well.
*
* @param managedCtClass Class to enhance
*/
public void enhanceFieldAccess(CtClass managedCtClass) {
final ConstPool constPool = managedCtClass.getClassFile().getConstPool();
for (Object oMethod : managedCtClass.getClassFile().getMethods()) {
final MethodInfo methodInfo = (MethodInfo) oMethod;
final String methodName = methodInfo.getName();
// skip methods added by enhancement and abstract methods (methods without any code)
if (methodName.startsWith("$$_hibernate_") || methodInfo.getCodeAttribute() == null) {
continue;
}
try {
final CodeIterator itr = methodInfo.getCodeAttribute().iterator();
while (itr.hasNext()) {
int index = itr.next();
int op = itr.byteAt(index);
if (op != Opcode.PUTFIELD && op != Opcode.GETFIELD) {
continue;
}
String fieldName = constPool.getFieldrefName(itr.u16bitAt(index + 1));
String fieldClassName =
constPool.getClassInfo(constPool.getFieldrefClass(itr.u16bitAt(index + 1)));
CtClass targetCtClass = this.classPool.getCtClass(fieldClassName);
if (!enhancementContext.isEntityClass(targetCtClass)
&& !enhancementContext.isCompositeClass(targetCtClass)) {
continue;
}
if (targetCtClass == managedCtClass
|| !enhancementContext.isPersistentField(targetCtClass.getField(fieldName))
|| "this$0".equals(fieldName)) {
continue;
}
log.debugf("Transforming access to field [%s] from method [%s]", fieldName, methodName);
if (op == Opcode.GETFIELD) {
int fieldReaderMethodIndex =
constPool.addMethodrefInfo(
constPool.addClassInfo(fieldClassName),
EnhancerConstants.PERSISTENT_FIELD_READER_PREFIX + fieldName,
"()" + constPool.getFieldrefType(itr.u16bitAt(index + 1)));
itr.writeByte(Opcode.INVOKEVIRTUAL, index);
itr.write16bit(fieldReaderMethodIndex, index + 1);
} else {
int fieldWriterMethodIndex =
constPool.addMethodrefInfo(
constPool.addClassInfo(fieldClassName),
EnhancerConstants.PERSISTENT_FIELD_WRITER_PREFIX + fieldName,
"(" + constPool.getFieldrefType(itr.u16bitAt(index + 1)) + ")V");
itr.writeByte(Opcode.INVOKEVIRTUAL, index);
itr.write16bit(fieldWriterMethodIndex, index + 1);
}
}
methodInfo.getCodeAttribute().setAttribute(MapMaker.make(classPool, methodInfo));
} catch (BadBytecode bb) {
final String msg =
String.format(
"Unable to perform field access transformation in method [%s]", methodName);
throw new EnhancementException(msg, bb);
} catch (NotFoundException nfe) {
final String msg =
String.format(
"Unable to perform field access transformation in method [%s]", methodName);
throw new EnhancementException(msg, nfe);
}
}
}