((cite: hotspot/src/share/vm/runtime/jfieldIDWorkaround.hpp))
      // This workaround is because JVMTI doesn't have distinct entry points
      // for methods that use static jfieldIDs and instance jfieldIDs.
      // The workaround is to steal a low-order bit:
      //   a 1 means the jfieldID is an instance jfieldID,
      //             and the rest of the word is the offset of the field.
      //   a 0 means the jfieldID is a static jfieldID,
      //             and the rest of the word is the JNIid*.
      //
      // Another low-order bit is used to mark if an instance field
      // is accompanied by an indication of which class it applies to.
      //
      // Bit-format of a jfieldID (most significant first):
      //  address:30        instance=0:1 checked=0:1
      //  offset:30         instance=1:1 checked=0:1
      //  klass:23 offset:7 instance=1:1 checked=1:1
      //
      // If the offset does not fit in 7 bits, or if the fieldID is
      // not checked, then the checked bit is zero and the rest of
      // the word (30 bits) contains only the offset.
      //