 25 Oct, 2016 5 commits


Robbert Krebbers authored

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
And also rename the corresponding proof mode tactics.

 05 Oct, 2016 1 commit


Robbert Krebbers authored

 28 Sep, 2016 2 commits


Robbert Krebbers authored

Robbert Krebbers authored

 27 Sep, 2016 2 commits


Robbert Krebbers authored
Used in iRevert, iClear, iFrame, and for generalizing the IH in iInduction and iLöb.

Robbert Krebbers authored

 20 Sep, 2016 1 commit


Robbert Krebbers authored
Before, it failed when these tactics were invoked with persistent hypotheses. The new behavior is more convenient when using these tactics to build other tactics.

 19 Sep, 2016 3 commits


Robbert Krebbers authored
This comment mostly addresses issue #34. There are still some issues:  For iLöb we can write `iLöb (x1 .. xn) as "IH"` to revert x1 .. xn before performing Löb induction. An analogue notation for iInduction results in parsing conflicts.  The names of the induction hypotheses in the Coq intro pattern are ignored. Instead, when using `iInduction x as pat "IH"` the induction hypotheses are given fresh names starting with "IH". The problem here is that the names in the introduction pattern are idents, whereas the induction hypotheses are inserted into the proof mode context, and thus need to have strings as names.

Robbert Krebbers authored
This closes issue 32.

Robbert Krebbers authored

 09 Sep, 2016 1 commit


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.

 05 Sep, 2016 1 commit


Robbert Krebbers authored

 30 Aug, 2016 1 commit


Robbert Krebbers authored

 25 Aug, 2016 1 commit


Robbert Krebbers authored
Following the time anology of later, the stepindex 0 corresponds does not correspond to 'now', but rather to the end of time (i.e. 'last').

 24 Aug, 2016 2 commits


Robbert Krebbers authored
This is allowed as long as one of the conjuncts is thrown away (i.e. is a wildcard _ in the introduction pattern). It corresponds to the principle of "external choice" in linear logic.

Robbert Krebbers authored

 05 Aug, 2016 2 commits


Robbert Krebbers authored

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).

 28 Jul, 2016 2 commits


Robbert Krebbers authored
This avoids recompilation of coq_tactics each time an instance is added.

Robbert Krebbers authored
The new implementation ensures that type class arguments are only infered in the very end. This avoids the need for the inG hack in a0348d7c.

 27 Jul, 2016 1 commit


Robbert Krebbers authored

 25 Jul, 2016 4 commits


Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored

 05 Jul, 2016 1 commit


Robbert Krebbers authored

 30 Jun, 2016 1 commit


Robbert Krebbers authored
This tweak allows us to declare pvs as an instance of FromPure (it is not an instance of IntoPure), making some tactics (like iPureIntro and done) work with pvs too.

 29 Jun, 2016 1 commit


Robbert Krebbers authored

 27 Jun, 2016 2 commits


Robbert Krebbers authored
We are now using the prefixes Into, From, and Is (the first two are inspired by the names of some traits in the Rust stdlib), and hopefully doing that consistenly.

Robbert Krebbers authored

 24 Jun, 2016 1 commit


Robbert Krebbers authored

 23 Jun, 2016 2 commits


Robbert Krebbers authored
This is more consistent with the proofmode, where we also call it pure.

Robbert Krebbers authored

 17 Jun, 2016 1 commit


Robbert Krebbers authored

 15 Jun, 2016 1 commit


Robbert Krebbers authored

 01 Jun, 2016 1 commit


Robbert Krebbers authored
Generating a fresh name consists of two stages: + Use [cbv] to compute a list representing the domain of the environment. This is a very simply computation that just erases the hypotheses. + Use [vm_compute] to compute a fresh name based on the list representing the domain. The domain itself should never contain evars, so [vm_compute] will do the job.
