code: protected final StackMapEntry find_stack_map_equal(int offset) {
  
      running_offset = -1; // no +1 on first entry
      for (int i = 0; i < stack_map_table.length; i++) {
        running_offset = stack_map_table[i].getByteCodeOffset() + running_offset + 1;
  
        if (running_offset > offset) {
          throw new RuntimeException("Invalid StackMap offset 1");
        }
  
        if (running_offset == offset) {
          return stack_map_table[i];
        }
        // try next map entry
      }
  
      // no offset matched
      throw new RuntimeException("Invalid StackMap offset 2");
    }
docs: Find the StackMap entry whose offset matches the input argument. Also sets running_offset.
  
  @param offset byte code offset
  @return the corresponding StackMapEntry