 25 Sep, 2017 1 commit


Robbert Krebbers authored
Typeclass search gets less confused when this version is used, also, we had the same for `wp_bind` already.

 24 Mar, 2017 1 commit


Robbert Krebbers authored
Instead, I have introduced a type class `Monoid` that is used by the big operators: Class Monoid {M : ofeT} (o : M → M → M) := { monoid_unit : M; monoid_ne : NonExpansive2 o; monoid_assoc : Assoc (≡) o; monoid_comm : Comm (≡) o; monoid_left_id : LeftId (≡) monoid_unit o; monoid_right_id : RightId (≡) monoid_unit o; }. Note that the operation is an argument because we want to have multiple monoids over the same type (for example, on `uPred`s we have monoids for `∗`, `∧`, and `∨`). However, we do bundle the unit because:  If we would not, the unit would appear explicitly in an implicit argument of the big operators, which confuses rewrite. By bundling the unit in the `Monoid` class it is hidden, and hence rewrite won't even see it.  The unit is unique. We could in principle have big ops over setoids instead of OFEs. However, since we do not have a canonical structure for bundled setoids, I did not go that way.

 15 Mar, 2017 3 commits


Robbert Krebbers authored

Robbert Krebbers authored

Ralf Jung authored

 09 Mar, 2017 1 commit


Ralf Jung authored

 05 Jan, 2017 1 commit


Ralf Jung authored

 04 Jan, 2017 1 commit


Ralf Jung authored

 03 Jan, 2017 1 commit


Ralf Jung authored
This patch was created using find name *.v  xargs L 1 awk i inplace '{from = 0} /^From/{ from = 1; ever_from = 1} { if (from == 0 && seen == 0 && ever_from == 1) { print "Set Default Proof Using \"Type*\"."; seen = 1 } }1 ' and some minor manual editing

 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.

 08 Dec, 2016 1 commit


Ralf Jung authored

 06 Dec, 2016 1 commit


Ralf Jung authored

 22 Nov, 2016 1 commit


Ralf Jung 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 3 commits
 28 Oct, 2016 1 commit


Robbert Krebbers authored

 25 Oct, 2016 2 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
And also rename the corresponding proof mode tactics.

 16 Oct, 2016 1 commit


JacquesHenri Jourdan authored
This fact is deduced from reducibility. Unfortunately, this sometimes depends on the type of states being inhabited, so that this additional hypothesis sometimes appear.

 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 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.

 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 1 commit


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).

 13 Jul, 2016 1 commit


Robbert Krebbers authored
The intropattern {H} also meant clear (both in ssreflect, and the logic part of the introduction pattern).

 04 Jul, 2016 1 commit


JacquesHenri Jourdan authored

 02 Jul, 2016 2 commits


JacquesHenri Jourdan authored

JacquesHenri Jourdan authored
Lifting lemmas : make the initial state appear under an existential under the view shift. This is still sound, but slightly more expressive.

 30 Jun, 2016 1 commit


Robbert Krebbers authored
Concretely, when execution of any of the wp_ tactics does not yield another wp, it will make sure that a view shift is kept. This behavior was already partially there, but now it is hopefully more consistent.

 17 Jun, 2016 1 commit


Robbert Krebbers authored

 31 May, 2016 1 commit


Robbert Krebbers authored
be the same as
↔ . This is a fairly intrusive change, but at least makes notations more consistent, and often shorter because fewer parentheses are needed. Note that viewshifts already had the same precedence as →.

 09 May, 2016 1 commit


Robbert Krebbers authored

 19 Apr, 2016 1 commit


Robbert Krebbers authored
That way, we do not have useless type annotations of the form "v : language.val heap_lang" cluttering about any goal. Note, that we could decide to eta expand everywhere (as we do for ∀ and ∃), and use the notation "WP e {{ Q }}" for "wp e ⊤ (λ _, Q)".

 30 Mar, 2016 2 commits
 29 Mar, 2016 2 commits


Robbert Krebbers authored

Ralf Jung authored
This required a new ectx axiom: Positivity of evaluation contexts. This axiom was also present in the old Iris 1.1 development, back when it still derived lifting axioms for ectx languages.
