 09 Dec, 2016 2 commits


Ralf Jung authored

Robbert Krebbers authored
The WP construction now takes an invariant on states as a parameter (part of the irisG class) and no longer builds in the authoritative ownership of the entire state. When instantiating WP with a concrete language on can choose its state invariant. For example, for heap_lang we directly use `auth (gmap loc (frac * dec_agree val))`, and avoid the indirection through invariants entirely. As a result, we no longer have to carry `heap_ctx` around.

 06 Dec, 2016 1 commit


Ralf Jung authored

 05 Dec, 2016 1 commit


Robbert Krebbers authored
Using this new definition we can express being contractive using a Proper. This has the following advantages:  It makes it easier to state that a function with multiple arguments is contractive (in all or some arguments).  A solve_contractive tactic can be implemented by extending the solve_proper tactic.

 30 Nov, 2016 1 commit


JacquesHenri Jourdan authored

 24 Nov, 2016 1 commit


JacquesHenri Jourdan authored
The idea on magic wand is to use it for curried lemmas and use ⊢ for uncurried lemmas.

 22 Nov, 2016 1 commit


Ralf Jung authored

 17 Nov, 2016 2 commits


Robbert Krebbers authored

Robbert Krebbers authored
This reverts commit 2a7755fe because it is no longer needed after Matthieu Sozeau reverted this change in Coq 8.6. See also the discussion: [CoqClub] Coq 8.6 typeclasses behavior change at 11/16/2016 02:14 PM.

 15 Nov, 2016 1 commit


Robbert Krebbers authored
In Coq 8.6 type class search is not called recursively on premises that are not type classes. To that end, we use a hint extern to invoke an ordinary auto.

 09 Nov, 2016 1 commit


Robbert Krebbers authored

 06 Nov, 2016 1 commit


Robbert Krebbers authored

 03 Nov, 2016 1 commit


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.

 01 Nov, 2016 2 commits
 28 Oct, 2016 2 commits


Robbert Krebbers authored

Robbert Krebbers authored

 27 Oct, 2016 4 commits


Ralf Jung authored

Robbert Krebbers authored

Ralf Jung authored

Janno authored

 25 Oct, 2016 6 commits


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.

Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored
And also rename the corresponding proof mode tactics.

Robbert Krebbers authored

 13 Oct, 2016 1 commit


Ralf Jung authored

 12 Oct, 2016 1 commit


Ralf Jung authored
rename program_logic.{ownership > wsat}. It really is about world satisfaction and invariants more than about ownership.

 05 Oct, 2016 1 commit


Robbert Krebbers authored

 28 Sep, 2016 1 commit


Robbert Krebbers authored

 27 Sep, 2016 1 commit


Robbert Krebbers authored
As proposed by JH Jourdan in issue 34.

 05 Sep, 2016 1 commit


JacquesHenri Jourdan authored

 28 Aug, 2016 1 commit


Robbert Krebbers authored
This also removes the double use of the name 'wp_fork' in both program_logic/weakestpre and heap_lang/lifting.

 25 Aug, 2016 1 commit


Janno authored

 08 Aug, 2016 1 commit


Robbert Krebbers authored
This generalization is surprisingly easy in Iris 3.0, so I could not resist not doing it :).

 05 Aug, 2016 3 commits


Robbert Krebbers authored

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

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 (higherorder) 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 sideconditions 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).

 21 Jul, 2016 1 commit


Robbert Krebbers authored
In particular, remove ectx_language.atomic, because it seems unused expect for a smart constructor for language.atomic.
