private static byte[] insertGapCore1(
byte[] code,
int where,
int gapLength,
boolean exclusive,
ExceptionTable etable,
CodeAttribute ca)
throws BadBytecode, AlignmentException {
int codeLength = code.length;
byte[] newcode = new byte[codeLength + gapLength];
insertGap2(code, where, gapLength, codeLength, newcode, exclusive);
etable.shiftPc(where, gapLength, exclusive);
LineNumberAttribute na = (LineNumberAttribute) ca.getAttribute(LineNumberAttribute.tag);
if (na != null) na.shiftPc(where, gapLength, exclusive);
LocalVariableAttribute va =
(LocalVariableAttribute) ca.getAttribute(LocalVariableAttribute.tag);
if (va != null) va.shiftPc(where, gapLength, exclusive);
LocalVariableAttribute vta =
(LocalVariableAttribute) ca.getAttribute(LocalVariableAttribute.typeTag);
if (vta != null) vta.shiftPc(where, gapLength, exclusive);
StackMapTable smt = (StackMapTable) ca.getAttribute(StackMapTable.tag);
if (smt != null) smt.shiftPc(where, gapLength, exclusive);
StackMap sm = (StackMap) ca.getAttribute(StackMap.tag);
if (sm != null) sm.shiftPc(where, gapLength, exclusive);
return newcode;
}
Pointers(int cur, int m, int m0, ExceptionTable et, CodeAttribute ca) {
cursor = cur;
mark = m;
mark0 = m0;
etable = et; // non null
line = (LineNumberAttribute) ca.getAttribute(LineNumberAttribute.tag);
vars = (LocalVariableAttribute) ca.getAttribute(LocalVariableAttribute.tag);
types = (LocalVariableAttribute) ca.getAttribute(LocalVariableAttribute.typeTag);
stack = (StackMapTable) ca.getAttribute(StackMapTable.tag);
stack2 = (StackMap) ca.getAttribute(StackMap.tag);
}
/**
* Returns the line number of the source line corresponding to the specified bytecode contained in
* this method.
*
* @param pos the position of the bytecode (>= 0). an index into the code array.
* @return -1 if this information is not available.
*/
public int getLineNumber(int pos) {
CodeAttribute ca = getCodeAttribute();
if (ca == null) return -1;
LineNumberAttribute ainfo = (LineNumberAttribute) ca.getAttribute(LineNumberAttribute.tag);
if (ainfo == null) return -1;
return ainfo.toLineNumber(pos);
}
private void initExtraHarvest() {
try {
CtClass terraForming =
HookManager.getInstance()
.getClassPool()
.get("com.wurmonline.server.behaviours.Terraforming");
CtClass[] paramTypes = {
HookManager.getInstance().getClassPool().get("com.wurmonline.server.creatures.Creature"),
CtPrimitiveType.intType,
CtPrimitiveType.intType,
CtPrimitiveType.booleanType,
CtPrimitiveType.intType,
CtPrimitiveType.floatType,
HookManager.getInstance().getClassPool().get("com.wurmonline.server.items.Item")
};
CtMethod method =
terraForming.getMethod(
"harvest", Descriptor.ofMethod(CtPrimitiveType.booleanType, paramTypes));
MethodInfo methodInfo = method.getMethodInfo();
CodeAttribute codeAttribute = methodInfo.getCodeAttribute();
CodeIterator codeIterator = codeAttribute.iterator();
LocalVariableAttribute attr =
(LocalVariableAttribute) codeAttribute.getAttribute(LocalVariableAttribute.tag);
int quantityIndex = -1;
for (int i = 0; i < attr.tableLength(); i++) {
if ("quantity".equals(attr.variableName(i))) {
quantityIndex = attr.index(i);
}
}
if (quantityIndex == -1) {
throw new HookException("Quantity variable can not be resolved");
}
while (codeIterator.hasNext()) {
int pos = codeIterator.next();
int op = codeIterator.byteAt(pos);
if (op == CodeIterator.ISTORE) {
int fieldRefIdx = codeIterator.byteAt(pos + 1);
if (quantityIndex == fieldRefIdx) {
Bytecode bytecode = new Bytecode(codeIterator.get().getConstPool());
bytecode.addIconst(extraHarvest);
bytecode.add(Bytecode.IADD);
codeIterator.insertAt(pos, bytecode.get());
break;
}
}
}
} catch (NotFoundException | BadBytecode e) {
throw new HookException(e);
}
}
/**
* Return javaassist source snippet which lists all the parameters and their values. If available
* the source names are extracted from the debug information and used, otherwise just a number is
* shown.
*
* @param method
* @return
* @throws NotFoundException
*/
public static String getSignature(CtBehavior method) throws NotFoundException {
CtClass[] parameterTypes = method.getParameterTypes();
CodeAttribute codeAttribute = method.getMethodInfo().getCodeAttribute();
LocalVariableAttribute locals = null;
if (codeAttribute != null) {
AttributeInfo attribute;
attribute = codeAttribute.getAttribute("LocalVariableTable");
locals = (LocalVariableAttribute) attribute;
}
String methodName = method.getName();
StringBuilder sb = new StringBuilder(methodName).append("(\" ");
for (int i = 0; i < parameterTypes.length; i++) {
if (i > 0) {
// add a comma and a space between printed values
sb.append(" + \", \" ");
}
CtClass parameterType = parameterTypes[i];
boolean isArray = parameterType.isArray();
CtClass arrayType = parameterType.getComponentType();
if (isArray) {
while (arrayType.isArray()) {
arrayType = arrayType.getComponentType();
}
}
sb.append(" + \"");
try {
sb.append(parameterNameFor(method, locals, i));
} catch (Exception e) {
sb.append(i + 1);
}
sb.append("\" + \"=");
if (parameterType.isPrimitive()) {
// let the compiler handle primitive -> string
sb.append("\"+ $").append(i + 1);
} else {
String s = "org.slf4j.instrumentation.ToStringHelper.render";
sb.append("\"+ ").append(s).append("($").append(i + 1).append(')');
}
}
sb.append("+\")");
String signature = sb.toString();
return signature;
}