((cite: hotspot/src/share/vm/runtime/vmStructs.hpp))
    // This table encapsulates the debugging information required by the
    // serviceability agent in order to run. Specifically, we need to
    // understand the layout of certain C data structures (offsets, in
    // bytes, of their fields.)
    //
    // There are alternatives for the design of this mechanism, including
    // parsing platform-specific debugging symbols from a debug build into
    // a program database. While this current mechanism can be considered
    // to be a workaround for the inability to debug arbitrary C and C++
    // programs at the present time, it does have certain advantages.
    // First, it is platform-independent, which will vastly simplify the
    // initial bringup of the system both now and on future platforms.
    // Second, it is embedded within the VM, as opposed to being in a
    // separate program database; experience has shown that whenever
    // portions of a system are decoupled, version skew is problematic.
    // Third, generating a program database, for example for a product
    // build, would probably require two builds to be done: the desired
    // product build as well as an intermediary build with the PRODUCT
    // flag turned on but also compiled with -g, leading to a doubling of
    // the time required to get a serviceability agent-debuggable product
    // build. Fourth, and very significantly, this table probably
    // preserves more information about field types than stabs do; for
    // example, it preserves the fact that a field is a "jlong" rather
    // than transforming the type according to the typedef in jni_md.h,
    // which allows the Java-side code to identify "Java-sized" fields in
    // C++ data structures. If the symbol parsing mechanism was redone
    // using stabs, it might still be necessary to have a table somewhere
    // containing this information.
    //
    // Do not change the sizes or signedness of the integer values in
    // these data structures; they are fixed over in the serviceability
    // agent's Java code (for bootstrapping).

    ((cite: hotspot/src/share/vm/runtime/vmStructs.hpp))
    // This class is a friend of most classes, to be able to access
    // private fields
    class VMStructs {