1. 06 Dec, 2016 1 commit
  2. 22 Nov, 2016 1 commit
  3. 09 Nov, 2016 1 commit
  4. 03 Nov, 2016 1 commit
    • Robbert Krebbers's avatar
      Use symbol ∗ for separating conjunction. · cc31476d
      Robbert Krebbers authored
      The old choice for ★ was a arbitrary: the precedence of the ASCII asterisk *
      was fixed at a wrong level in Coq, so we had to pick another symbol. The ★ was
      a random choice from a unicode chart.
      
      The new symbol ∗ (as proposed by David Swasey) corresponds better to
      conventional practise and matches the symbol we use on paper.
      cc31476d
  5. 01 Nov, 2016 1 commit
  6. 27 Oct, 2016 1 commit
  7. 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
  8. 05 Oct, 2016 1 commit
  9. 09 Sep, 2016 1 commit
    • Robbert Krebbers's avatar
      Support for specialization of P₁ -★ .. -★ Pₙ -★ Q where Q is persistent. · 090aaea3
      Robbert Krebbers authored
      Before this commit, given "HP" : P and "H" : P -★ Q with Q persistent, one
      could write:
      
        iSpecialize ("H" with "#HP")
      
      to eliminate the wand in "H" while keeping the resource "HP". The lemma:
      
        own_valid : own γ x ⊢ ✓ x
      
      was the prototypical example where this pattern (using the #) was used.
      
      However, the pattern was too limited. For example, given "H" : P₁ -★ P₂ -★ Q",
      one could not write iSpecialize ("H" with "#HP₁") because P₂ -★ Q is not
      persistent, even when Q is.
      
      So, instead, this commit introduces the following tactic:
      
        iSpecialize pm_trm as #
      
      which allows one to eliminate implications and wands while being able to use
      all hypotheses to prove the premises, as well as being able to use all
      hypotheses to prove the resulting goal.
      
      In the case of iDestruct, we now check whether all branches of the introduction
      pattern start with an `#` (moving the hypothesis to the persistent context) or
      `%` (moving the hypothesis to the pure Coq context). If this is the case, we
      allow one to use all hypotheses for proving the premises, as well as for proving
      the resulting goal.
      090aaea3
  10. 25 Aug, 2016 1 commit
  11. 08 Aug, 2016 1 commit
  12. 05 Aug, 2016 4 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
      More introduction patterns. · 4d8c4ac8
      Robbert Krebbers authored
      Also make those for introduction and elimination more symmetric:
      
        !%   pure introduction         %        pure elimination
        !#   always introduction       #        always elimination
        !>   later introduction        > pat    timeless later elimination
        !==> view shift introduction   ==> pat  view shift elimination
      4d8c4ac8
    • 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
  13. 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
  14. 19 Jul, 2016 3 commits
  15. 15 Jul, 2016 1 commit
  16. 13 Jul, 2016 1 commit
  17. 30 Jun, 2016 4 commits
  18. 23 Jun, 2016 1 commit
  19. 01 Jun, 2016 3 commits
  20. 31 May, 2016 1 commit
  21. 25 May, 2016 1 commit
    • Robbert Krebbers's avatar
      Tweak the algebraic hierarchy. · a3d0a338
      Robbert Krebbers authored
      - Make the carrier argument of the constructors for the canonical structures
        cofeT and cmraT explicit. This way we make sure the carrier is properly
        exposed, instead of some alias of the carrier.
      - Make derived constructions (such as discreteC and discreteR) notations
        instead of definitions. This is yet again to make sure that the carrier is
        properly exposed.
      - Turn DRA into a canonical structure (it used to be a type class).
      
      This fixes some issues, notably it fixes some broken rewrites in algebra/sts
      and it makes canonical structures work properly with dec_agree.
      a3d0a338
  22. 24 May, 2016 2 commits
    • Robbert Krebbers's avatar
      eacb1c46
    • Robbert Krebbers's avatar
      Make specialization patterns for persistent premises more uniform. · 65bfa071
      Robbert Krebbers authored
      Changes:
      - We no longer have a different syntax for specializing a term H : P -★ Q whose
        range P or domain Q is persistent. There is just one syntax, and the system
        automatically determines whether either P or Q is persistent.
      - While specializing a term, always modalities are automatically stripped. This
        gets rid of the specialization pattern !.
      - Make the syntax of specialization patterns more consistent. The syntax for
        generating a goal is [goal_spec] where goal_spec is one of the following:
      
          H1 .. Hn : generate a goal using hypotheses H1 .. Hn
         -H1 .. Hn : generate a goal using all hypotheses but H1 .. Hn
                 # : generate a goal for the premise in which all hypotheses can be
                     used. This is only allowed when specializing H : P -★ Q where
                     either P or Q is persistent.
                 % : generate a goal for a pure premise.
      65bfa071
  23. 10 May, 2016 1 commit
  24. 02 May, 2016 1 commit
  25. 19 Apr, 2016 2 commits
  26. 12 Apr, 2016 1 commit