 23 Aug, 2016 1 commit


Robbert Krebbers authored

 22 Aug, 2016 1 commit


Robbert Krebbers authored
This is more consistent with CAS, which also can be used on any value. Note that being able to (atomically) test for equality of any value and being able to CAS on any value is not realistic. See the discussion at https://gitlab.mpisws.org/FP/iriscoq/issues/26, and in particular JH Jourdan's observation: I think indeed for heap_lang this is just too complicated. Anyway, the role of heap_lang is not to model any actual programming language, but rather to show that we can do proofs about certain programs. The fact that you can write unrealistic programs is not a problem, IMHO. The only thing which is important is that the program that we write are realistic (i.e., faithfully represents the algorithm we want to p This commit is based on a commit by Zhen Zhang who generalized equality to work on any literal (and not just integers).

 08 Aug, 2016 2 commits


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

Robbert Krebbers authored
This makes stuff more uniform and also removes the need for the [inGFs] type class. Instead, there is now a type class [subG Σ1 Σ2] which expresses that a list of functors [Σ1] is contained in [Σ2].

 05 Aug, 2016 3 commits


Robbert Krebbers authored
Use it to prove that tests/barrier_client and tests/heap_lang are adequate.

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).

 19 Jul, 2016 1 commit


Robbert Krebbers authored

 15 Jul, 2016 1 commit


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).

 23 Jun, 2016 1 commit


Robbert Krebbers authored

 17 Jun, 2016 1 commit


Robbert Krebbers authored
Fixes issue #20.

 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.

 26 Apr, 2016 1 commit


Robbert Krebbers authored
It is no longer triggered when posing [P ⊢ Q] with [P] an evar. This, for example, makes sure that iApply pvs_intro works, which failed before.

 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)".

 15 Apr, 2016 1 commit


Ralf Jung authored

 13 Apr, 2016 1 commit


Ralf Jung authored

 12 Apr, 2016 3 commits


Robbert Krebbers authored

Robbert Krebbers authored
This reverts commit 3cc38ff6. The reverted pure hypotheses and variables appear in the wrong order.

Robbert Krebbers authored

 11 Apr, 2016 1 commit


Robbert Krebbers authored

 08 Apr, 2016 1 commit


Robbert Krebbers authored
Since strip_later is doing a good job stripping laters in the conclusion, these tactics are thus no longer needed. Also, wp_finish now properly converts the result in a primitive viewshift in case it is not a weakestpre.

 29 Mar, 2016 3 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.

Ralf Jung authored

 20 Mar, 2016 1 commit


Ralf Jung authored

 10 Mar, 2016 5 commits


Ralf Jung authored

Ralf Jung authored

Ralf Jung authored

Ralf Jung authored

Robbert Krebbers authored
Thanks to Amin Timany for the suggestion.

 07 Mar, 2016 1 commit


Ralf Jung authored
Add both nonexpansive and contractive functors, and bundle them for the general Iris instance as well as the global functor construction This allows us to move the \later in the userdefined functor to any place we want. In particular, we can now have "\later (iProp > iProp)" in the ghost CMRA.

 05 Mar, 2016 1 commit


Ralf Jung authored

 04 Mar, 2016 1 commit


Robbert Krebbers authored

 03 Mar, 2016 1 commit


Robbert Krebbers authored

 02 Mar, 2016 3 commits


Ralf Jung authored

Robbert Krebbers authored
We no longer abuse empty strings for anonymous binders. Instead, we now have a data type for binders: a binder is either named or anonymous.

Robbert Krebbers authored
