/** {@inheritDoc} */
@Override
public List<Mutation> apply(
MethodNode mn,
String className,
String methodName,
BytecodeInstruction instruction,
Frame frame) {
List<Mutation> mutations = new LinkedList<Mutation>();
FieldInsnNode node = (FieldInsnNode) instruction.getASMNode();
Type fieldType = Type.getType(node.desc);
// insert mutation into bytecode with conditional
InsnList mutation = new InsnList();
logger.debug("Mutation deletefield for statement " + node.name + node.desc);
if (node.getOpcode() == Opcodes.GETFIELD) {
logger.debug("Deleting source of type " + node.owner);
mutation.add(new InsnNode(Opcodes.POP));
}
mutation.add(getDefault(fieldType));
// insert mutation into pool
Mutation mutationObject =
MutationPool.addMutation(
className,
methodName,
NAME + " " + node.name + node.desc,
instruction,
mutation,
getInfectionDistance(node, mutation));
mutations.add(mutationObject);
return mutations;
}
/**
* getInfectionDistance
*
* @param original a {@link org.objectweb.asm.tree.FieldInsnNode} object.
* @param mutant a {@link org.objectweb.asm.tree.InsnList} object.
* @return a {@link org.objectweb.asm.tree.InsnList} object.
*/
public InsnList getInfectionDistance(FieldInsnNode original, InsnList mutant) {
InsnList distance = new InsnList();
if (original.getOpcode() == Opcodes.GETFIELD)
distance.add(new InsnNode(Opcodes.DUP)); // make sure to re-load this for GETFIELD
distance.add(
new FieldInsnNode(original.getOpcode(), original.owner, original.name, original.desc));
Type type = Type.getType(original.desc);
if (type.getDescriptor().startsWith("L") || type.getDescriptor().startsWith("[")) {
ReplaceVariable.addReferenceDistanceCheck(distance, type, mutant);
} else {
ReplaceVariable.addPrimitiveDistanceCheck(distance, type, mutant);
}
return distance;
}
@Override
public byte[] transform(String name, String transformedName, byte[] basicClass) {
if (!"net.minecraft.item.ItemStack".equals(name)) return basicClass;
ClassNode classNode = new ClassNode();
ClassReader classReader = new ClassReader(basicClass);
classReader.accept(classNode, 0);
FieldNode itemField = null;
for (FieldNode f : classNode.fields) {
if (ITEM_TYPE.equals(f.desc) && itemField == null) {
itemField = f;
} else if (ITEM_TYPE.equals(f.desc)) {
throw new RuntimeException("Error processing ItemStack - found a duplicate Item field");
}
}
if (itemField == null) {
throw new RuntimeException(
"Error processing ItemStack - no Item field declared (is the code somehow obfuscated?)");
}
MethodNode getItemMethod = null;
for (MethodNode m : classNode.methods) {
if (GETITEM_DESC.equals(m.desc) && getItemMethod == null) {
getItemMethod = m;
} else if (GETITEM_DESC.equals(m.desc)) {
throw new RuntimeException("Error processing ItemStack - duplicate getItem method found");
}
}
if (getItemMethod == null) {
throw new RuntimeException(
"Error processing ItemStack - no getItem method found (is the code somehow obfuscated?)");
}
for (MethodNode m : classNode.methods) {
for (ListIterator<AbstractInsnNode> it = m.instructions.iterator(); it.hasNext(); ) {
AbstractInsnNode insnNode = it.next();
if (insnNode.getType() == AbstractInsnNode.FIELD_INSN) {
FieldInsnNode fi = (FieldInsnNode) insnNode;
if (itemField.name.equals(fi.name) && fi.getOpcode() == Opcodes.GETFIELD) {
it.remove();
MethodInsnNode replace =
new MethodInsnNode(
Opcodes.INVOKEVIRTUAL,
"net/minecraft/item/ItemStack",
getItemMethod.name,
getItemMethod.desc,
false);
it.add(replace);
}
}
}
}
ClassWriter writer = new ClassWriter(ClassWriter.COMPUTE_MAXS);
classNode.accept(writer);
return writer.toByteArray();
}
