 09 Dec, 2016 3 commits


Ralf Jung authored

Robbert Krebbers 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

 07 Dec, 2016 1 commit

 06 Dec, 2016 2 commits
 09 Nov, 2016 2 commits


Robbert Krebbers authored

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
 27 Oct, 2016 2 commits


Robbert Krebbers authored

Ralf Jung 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.

 06 Sep, 2016 1 commit


Robbert Krebbers authored

 05 Aug, 2016 2 commits


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.

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).

 20 Jul, 2016 1 commit


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.

 19 Jul, 2016 4 commits


Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored

 15 Jul, 2016 2 commits


Robbert Krebbers authored

Robbert Krebbers authored

 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).

 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.

 24 May, 2016 1 commit


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.

 10 May, 2016 1 commit


Robbert Krebbers authored
And make constants P for which we do not want of_val P to reduce Opaque.

 02 May, 2016 1 commit


Robbert Krebbers authored
iSpecialize and iDestruct. These tactics now all take an iTrm, which is a tuple consisting of a.) a lemma or name of a hypotheses b.) arguments to instantiate c.) a specialization pattern.

 20 Apr, 2016 2 commits


Robbert Krebbers authored
 It can now also frame under later.  Better treatment of evars, it now won't end up in loops whenever the goal involves subformulas ?P and it trying to apply all framing rules eagerly.  It no longer delta expands while framing.  Better clean up of True subformulas after a successful frame. For example, framing "P" in "▷ ▷ P ★ Q" yields just "Q" instead of "▷ True ★ Q" or so.

Ralf Jung authored

 19 Apr, 2016 1 commit


Robbert Krebbers authored
Par is now defined as an expression of type [∀ X, expr X] (instead of a value) and we prove that it is stable under weakening and substitution.

 12 Apr, 2016 1 commit


Robbert Krebbers authored
It is not a library; it does not contain code, but instead is a core part of heap_lang.

 11 Apr, 2016 1 commit


Robbert Krebbers authored

 20 Mar, 2016 1 commit


Ralf Jung authored

 10 Mar, 2016 2 commits