Skip to content

GitLab

GHC
GHC
Switch branch/tag
  1. 04 Nov, 2014 8 commits
  3. 03 Nov, 2014 1 commit
  5. 02 Nov, 2014 9 commits
  7. 01 Nov, 2014 2 commits
  9. 30 Oct, 2014 4 commits
  11. 28 Oct, 2014 4 commits
  13. 27 Oct, 2014 1 commit
  15. 26 Oct, 2014 1 commit
  17. 24 Oct, 2014 1 commit
    • Edward Z. Yang's avatar
      Implementation of hsig (module signatures), per #9252 · aa479953
      Edward Z. Yang authored 
      Summary:
Module signatures, like hs-boot files, are Haskell modules which omit
value definitions and contain only signatures.  This patchset implements
one particular aspect of module signature, namely compiling them against
a concrete implementation.  It works like this: when we compile an hsig
file, we must be told (via the -sig-of flag) what module this signature
is implementing.  The signature is compiled into an interface file which
reexports precisely the entities mentioned in the signature file.  We also
verify that the interface is compatible with the implementation.

This feature is useful in a few situations:

    1. Like explicit import lists, signatures can be used to reduce
    sensitivity to upstream changes.  However, a signature can be defined
    once and then reused by many modules.

    2. Signatures can be used to quickly check if a new upstream version
    is compatible, by typechecking just the signatures and not the actual
    modules.

    3. A signature can be used to mediate separate modular development,
    where the signature is used as a placeholder for functionality which
    is loaded in later.  (This is only half useful at the moment, since
    typechecking against signatures without implementations is not implemented
    in this patchset.)

Unlike hs-boot files, hsig files impose no performance overhead.

This patchset punts on the type class instances (and type families) problem:
instances simply leak from the implementation to the signature.  You can
explicitly specify what instances you expect to have, and those will be checked,
but you may get more instances than you asked for.  Our eventual plan is
to allow hiding instances, but to consider all transitively reachable instances
when considering overlap and soundness.

ToDo: signature merging: when a module is provided by multiple signatures
for the same base implementation, we should not consider this ambiguous.

ToDo: at the moment, signatures do not constitute use-sites, so if you
write a signature for a deprecated function, you won't get a warning
when you compile the signature.

Future work: The ability to feed in shaping information so that we can take
advantage of more type equalities than might be immediately evident.
Signed-off-by: default avatarEdward Z. Yang <ezyang@cs.stanford.edu>

Test Plan: validate and new tests

Reviewers: simonpj, simonmar, hvr, austin

Subscribers: simonmar, relrod, ezyang, carter, goldfire

Differential Revision: https://phabricator.haskell.org/D130

GHC Trac Issues: #9252
      aa479953
  19. 22 Oct, 2014 2 commits
  21. 21 Oct, 2014 3 commits
  23. 20 Oct, 2014 1 commit
  25. 19 Oct, 2014 1 commit
    • Krzysztof Gogolewski's avatar
      Python 3 support, second attempt (Trac #9184) · d576fc38
      Krzysztof Gogolewski authored 
      Summary:
This is a fixup of https://phabricator.haskell.org/D233

The only difference is in findTFiles (first commit), which
previously broke Windows runner; now I translated literally
instead attempting to improve it, and checked it works.

Test Plan:
I used validate under 2,3 on Linux and under 2 on msys2.
On Windows I've seen a large number of failures, but they don't
seem to be connected with the patch.

Reviewers: hvr, simonmar, thomie, austin

Reviewed By: austin

Subscribers: thomie, carter, ezyang, simonmar

Differential Revision: https://phabricator.haskell.org/D310

GHC Trac Issues: #9184
      d576fc38
  27. 18 Oct, 2014 2 commits