 10 Jun, 2019 1 commit


Robbert Krebbers authored

 24 May, 2019 1 commit


Robbert Krebbers authored
This MR is a follow up on the renamings performed (implicitly) as part of !215. This MR makes the following changes:  `auth_both_frac_valid` and `auth_both_valid` are now of the same shape as `auth_both_frac_validN` and `auth_both_validN`. That is, both are now biimplications.  The lefttoright direction of `auth_both_frac_valid` and `auth_both_valid` only holds in case the camera is discrete. The righttoleft versions for nondiscrete cameras are prefixed `_2`, the convention that we use throughout the development.  Change the direction of lemmas like `auth_frag_valid` and `auth_auth_valid` so that it's consistent with the other lemmas. I.e. make sure that the ◯ and ● are always on the LHS of the biimplication.

 23 May, 2019 1 commit


Hai Dang authored

 20 Feb, 2019 1 commit


Robbert Krebbers authored

 29 Oct, 2018 2 commits


JacquesHenri Jourdan authored

JacquesHenri Jourdan authored
We add a specific constructor to the type of expressions for injecting values in expressions. The advantage are :  Values can be assumed to be always closed when performing substitutions (even though they could contain free variables, but it turns out it does not cause any problem in the proofs in practice). This means that we no longer need the `Closed` typeclass and everything that comes with it (all the reflectionbased machinery contained in tactics.v is no longer necessary). I have not measured anything, but I guess this would have a significant performance impact.  There is only one constructor for values. As a result, the AsVal and IntoVal typeclasses are no longer necessary: an expression which is a value will always unify with `Val _`, and therefore lemmas can be stated using this constructor. Of course, this means that there are two ways of writing such a thing as "The pair of integers 1 and 2": Either by using the value constructor applied to the pair represented as a value, or by using the expression pair constructor. So we add reduction rules that transform reduced pair, injection and closure expressions into values. At first, this seems weird, because of the redundancy. But in fact, this has some meaning, since the machine migth actually be doing something to e.g., allocate the pair or the closure. These additional steps of computation show up in the proofs, and some additional wp_* tactics need to be called.

 04 Oct, 2018 1 commit


JacquesHenri Jourdan authored

 02 May, 2018 1 commit


Ralf Jung authored

 25 Apr, 2018 1 commit


Ralf Jung authored

 07 Feb, 2018 1 commit


Robbert Krebbers authored
For example, framing `P` in `(P ∨ Q) ∗ R` now succeeds and turns the goal into `R`.

 23 Dec, 2017 1 commit


JacquesHenri Jourdan authored

 04 Dec, 2017 1 commit


Robbert Krebbers authored

 13 Nov, 2017 1 commit


Robbert Krebbers authored

 25 Oct, 2017 2 commits


Robbert Krebbers authored

Robbert Krebbers authored
The advantage is that we can directly use a Coq introduction pattern `cpat` to perform actions to the pure assertion. Before, this had to be done in several steps: iDestruct ... as "[Htmp ...]"; iDestruct "Htmp" as %cpat. That is, one had to introduce a temporary name. I expect this to be quite useful in various developments as many of e.g. our invariants are written as: ∃ x1 .. x2, ⌜ pure stuff ⌝ ∗ spacial stuff.

 25 Sep, 2017 1 commit


Dan Frumin authored
Instead of writing a separate tactic lemma for each pure reduction, there is a single tactic lemma for performing all of them. The instances of PureExec can be shared between WP tactics and, e.g. symbolic execution in the ghost threadpool

 17 Sep, 2017 1 commit


Robbert Krebbers authored
For obsolete reasons, that no longer seem to apply, we used ∅ as the unit.

 09 Sep, 2017 1 commit


Robbert Krebbers authored

 24 Mar, 2017 1 commit


Jeehoon Kang authored

 27 Jan, 2017 1 commit


Ralf Jung authored

 09 Jan, 2017 1 commit


Ralf Jung authored

 06 Jan, 2017 1 commit


Ralf Jung authored

 05 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 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

 06 Dec, 2016 2 commits
 22 Nov, 2016 1 commit


Ralf Jung authored

 17 Nov, 2016 1 commit


Robbert Krebbers 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 4 commits
 27 Oct, 2016 2 commits
 25 Oct, 2016 1 commit


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.
