 20 Sep, 2016 3 commits


Robbert Krebbers authored

Robbert Krebbers authored

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 6 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

Robbert Krebbers authored

Robbert Krebbers authored
This closes issue 32.

Robbert Krebbers authored

Robbert Krebbers authored
This solves issue 33.

 15 Sep, 2016 3 commits


JacquesHenri Jourdan authored

JacquesHenri Jourdan authored

JacquesHenri Jourdan authored

 09 Sep, 2016 3 commits


Robbert Krebbers authored

Robbert Krebbers authored

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

 29 Aug, 2016 1 commit


Robbert Krebbers authored

 25 Aug, 2016 3 commits


Robbert Krebbers authored

Robbert Krebbers authored

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

 08 Aug, 2016 4 commits


JacquesHenri Jourdan authored

Robbert Krebbers authored
In most cases it is a temporary whose name is useless and just clutters the error message.

Robbert Krebbers authored

Robbert Krebbers authored

 05 Aug, 2016 7 commits


Robbert Krebbers authored
This fixes issue #25.

Robbert Krebbers authored

Robbert Krebbers authored

Robbert Krebbers authored

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).

 04 Aug, 2016 4 commits


Robbert Krebbers authored
Prove some properties about it, and define timeless in terms of it, and factor this notion out of raw view shifts.

Robbert Krebbers authored
It not behaves more consistently with iExact and thus also works in the case H : P ★ □^n Q  Q.

Robbert Krebbers authored

Robbert Krebbers authored

 02 Aug, 2016 2 commits


Robbert Krebbers authored

Robbert Krebbers authored
