jodd-proxetta/src/main/java/jodd/asm7/ClassReader.java
protected Label readLabel(final int bytecodeOffset, final Label[] labels) {
    if (labels[bytecodeOffset] == null) {
      labels[bytecodeOffset] = new Label();
    }
    return labels[bytecodeOffset];
  }
protected Label readLabel(final int bytecodeOffset, final Label[] labels) {
    if (labels[bytecodeOffset] == null) {
      labels[bytecodeOffset] = new Label();
    }
    return labels[bytecodeOffset];
  }
Returns the label corresponding to the given bytecode offset. The default implementation of
this method creates a label for the given offset if it has not been already created.

@param bytecodeOffset a bytecode offset in a method.
@param labels the already created labels, indexed by their offset. If a label already exists
for bytecodeOffset this method must not create a new one. Otherwise it must store the new
label in this array.
@return a non null Label, which must be equal to labels[bytecodeOffset].