1. 25 Oct, 2016 2 commits
    • Robbert Krebbers's avatar
      Generalize update tactics into iMod and iModIntro for modalities. · fc30ca08
      Robbert Krebbers authored
      There are now two proof mode tactics for dealing with modalities:
      
      - `iModIntro` : introduction of a modality
      - `iMod pm_trm as (x1 ... xn) "ipat"` : eliminate a modality
      
      The behavior of these tactics can be controlled by instances of the `IntroModal`
      and `ElimModal` type class. We have declared instances for later, except 0,
      basic updates and fancy updates. The tactic `iMod` is flexible enough that it
      can also eliminate an updates around a weakest pre, and so forth.
      
      The corresponding introduction patterns of these tactics are `!>` and `>`.
      
      These tactics replace the tactics `iUpdIntro`, `iUpd` and `iTimeless`.
      
      Source of backwards incompatability: the introduction pattern `!>` is used for
      introduction of arbitrary modalities. It used to introduce laters by stripping
      of a later of each hypotheses.
      fc30ca08
    • Robbert Krebbers's avatar
      Rename rvs -> bupd (basic update), pvs -> fupd (fancy update). · 1b85d654
      Robbert Krebbers authored
      And also rename the corresponding proof mode tactics.
      1b85d654
  2. 05 Oct, 2016 1 commit
  3. 25 Aug, 2016 3 commits
  4. 09 Aug, 2016 1 commit
  5. 08 Aug, 2016 1 commit
  6. 05 Aug, 2016 3 commits
    • Robbert Krebbers's avatar
      Rename the wp_focus tactic into wp_bind. · 149d1ec6
      Robbert Krebbers authored
      This better reflects the name of the bind rule.
      
      I renamed an internal tactic that was previously called wp_bind into
      wp_bind_core.
      149d1ec6
    • Robbert Krebbers's avatar
    • Robbert Krebbers's avatar
      Iris 3.0: invariants and weakest preconditions encoded in the logic. · 1f589858
      Robbert Krebbers authored
      This commit features:
      
      - A simpler model. The recursive domain equation no longer involves a triple
        containing invariants, physical state and ghost state, but just ghost state.
        Invariants and physical state are encoded using (higher-order) ghost state.
      
      - (Primitive) view shifts are formalized in the logic and all properties about
        it are proven in the logic instead of the model. Instead, the core logic
        features only a notion of raw view shifts which internalizing performing frame
        preserving updates.
      
      - A better behaved notion of mask changing view shifts. In particular, we no
        longer have side-conditions on transitivity of view shifts, and we have a
        rule for introduction of mask changing view shifts |={E1,E2}=> P with
        E2 ⊆ E1 which allows to postpone performing a view shift.
      
      - The weakest precondition connective is formalized in the logic using Banach's
        fixpoint. All properties about the connective are proven in the logic instead
        of directly in the model.
      
      - Adequacy is proven in the logic and uses a primitive form of adequacy for
        uPred that only involves raw views shifts and laters.
      
      Some remarks:
      
      - I have removed binary view shifts. I did not see a way to describe all rules
        of the new mask changing view shifts using those.
      - There is no longer the need for the notion of "frame shifting assertions" and
        these are thus removed. The rules for Hoare triples are thus also stated in
        terms of primitive view shifts.
      
      TODO:
      
      - Maybe rename primitive view shift into something more sensible
      - Figure out a way to deal with closed proofs (see the commented out stuff in
        tests/heap_lang and tests/barrier_client).
      1f589858
  7. 27 Jul, 2016 2 commits
    • Robbert Krebbers's avatar
      Declare inG arguments of own_* implicit but not maximally inserted. · de9438cb
      Robbert Krebbers authored
      This way type class inference is not invokved when used in tactics
      like iPvs while not having to write an @.
      
      (Idea suggested by Ralf.)
      de9438cb
    • Robbert Krebbers's avatar
      Make type class inference for inG less eager. · a0348d7c
      Robbert Krebbers authored
      This way, it won't pick arbitrary (and possibly wrong!) inG instances
      when multiple ones are available. We achieve this by declaring:
      
        Hint Mode inG - - +
      
      So that type class inference only succeeds when the type of the ghost
      variable does not include any evars.
      
      This required me to make some minor changes throughout the whole
      development making some types explicit.
      a0348d7c
  8. 20 Jul, 2016 1 commit
    • Robbert Krebbers's avatar
      Partially revert "Explicit namespaces for counter, lock and spawn." · e67a4876
      Robbert Krebbers authored
      In order to improve flexibility, I have reverted the changes in commit
      5cabd278 to counter, lock and spawn because an explicit namespace may be in
      the way of modularity, for example, if the interfaces of these libraries will
      expose namespaces through view shifts in the future.
      
      Exposure of namespaces in the case of par is very unlikely, so to that end,
      par remains to use an explicit namespace.
      e67a4876
  9. 19 Jul, 2016 3 commits
  10. 18 Jul, 2016 1 commit
  11. 15 Jul, 2016 1 commit
  12. 13 Jul, 2016 1 commit
  13. 11 Jul, 2016 1 commit
  14. 30 Jun, 2016 1 commit
  15. 23 Jun, 2016 1 commit
  16. 01 Jun, 2016 2 commits
  17. 31 May, 2016 1 commit
  18. 10 May, 2016 2 commits
  19. 06 May, 2016 1 commit
  20. 02 May, 2016 1 commit
  21. 19 Apr, 2016 2 commits
  22. 12 Apr, 2016 4 commits
  23. 11 Apr, 2016 1 commit
  24. 08 Apr, 2016 1 commit
    • Robbert Krebbers's avatar
      Remove wp_X> tactics and improve wp_finish. · eab6c6c4
      Robbert Krebbers authored
      Since strip_later is doing a good job stripping laters in the conclusion,
      these tactics are thus no longer needed. Also, wp_finish now properly
      converts the result in a primitive viewshift in case it is not a weakestpre.
      eab6c6c4
  25. 07 Apr, 2016 1 commit
  26. 29 Mar, 2016 1 commit