Commits on Mar 24, 2017

1. reduce space required by idna data tables …

   The `Range` type defined by uts46 takes up 20 bytes on a 32-bit platform
   and 32 bytes on a 64-bit platform.  This bloat is due to `Mapping` using
   a full word-width discriminant for its type and native string slices,
   which are unnecessarily large.  The use of native string slices in this
   context also require many load-time relocations on some platforms when
   idna is used in a static library, another unnecessary cost.
   
   Instead of this scheme, we can define our own string slice type that
   indexes into a generated table.  This string slice type enables us to
   use a smaller discriminant type for `Mapping`, and therefore reduces the
   size of `Range` to 16 bytes on a 32-bit platform and 16 bytes on a
   64-bit platform.  For x86-64 Linux, this change reduces total idna size
   by ~130K, a significant savings.
   
   Changing the script to use unicode escapes makes things slightly more
   readable, enables better eyeball comparisons of the generated tables to
   the original mapping table, and makes syntax highlighting in emacs
   somewhat faster.

   

   froydnj committed Mar 24, 2017

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