Skip to content
GitLab
Projects
Groups
Snippets
Help
Loading...
Help
Help
Support
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in
Toggle navigation
why3
Project overview
Project overview
Details
Activity
Releases
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Issues
113
Issues
113
List
Boards
Labels
Service Desk
Milestones
Merge Requests
12
Merge Requests
12
Packages & Registries
Packages & Registries
Container Registry
Analytics
Analytics
Repository
Value Stream
Wiki
Wiki
Snippets
Snippets
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Create a new issue
Commits
Issue Boards
Open sidebar
Why3
why3
Commits
c56d7aaa
Commit
c56d7aaa
authored
Apr 11, 2011
by
JeanChristophe Filliâtre
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
Altergo has no input syntax for triggers on existential quantifiers
parent
56135b10
Changes
3
Hide whitespace changes
Inline
Sidebyside
Showing
3 changed files
with
79 additions
and
4 deletions
+79
4
CHANGES
CHANGES
+1
1
examples/programs/tortoise_hare.mlw
examples/programs/tortoise_hare.mlw
+73
0
src/printer/alt_ergo.ml
src/printer/alt_ergo.ml
+5
3
No files found.
CHANGES
View file @
c56d7aaa
* marks an incompatible change
o fixed Altergo output: no triggers for "exists" quantifier
o [IDE] tool "Replay" works
o [IDE] does not use Threads anymore, thanks to Call_provers.query_call
o VC gen produces explanations in a suitable form for IDE
...
...
examples/programs/tortoise_hare.mlw
0 → 100644
View file @
c56d7aaa
(* Floyd's ``the tortoise and the hare'' algorithm. *)
module TortoiseHare
use import int.Int
(* We consider a function f over an abstract type t *)
type t
logic f t : t
(* Given some x0 in t, we consider the sequence of the repeated calls
to f starting from x0. *)
logic x int : t
axiom xdef: forall n:int. n >= 0 > x (n+1) = f (x n)
logic x0 : t = x 0
(* If t is finite, this sequence will eventually end up on a cycle.
Let us simply assume the existence of this cycle, that is
x (i + lambda) = x i, for some lambda > 0 and i large enough. *)
logic mu : int
axiom mu: mu >= 0
logic lambda : int
axiom lambda: lambda >= 1
axiom cycle: forall i:int. mu <= i > x (i + lambda) = x i
lemma cycle_gen:
forall i:int. mu <= i > forall k:int. 0 <= k > x (i + lambda * k) = x i
(* The challenge is to prove that the recursive function
let rec run x1 x2 = if x1 <> x2 then run (f x1) (f (f x2))
terminates when called on x0 and (f x0).
*)
logic dist int int : int
axiom dist_def1:
forall n m: int. 0 <= n <= m >
x (n + dist n m) = x m
axiom dist_def2:
forall n m: int. 0 <= n <= m >
forall k: int. x (n + k) = x m > dist n m <= k
logic r (x12 : (t, t)) (x'12 : (t, t)) =
let x1, x2 = x12 in
let x'1, x'2 = x'12 in
exists m:int.
x1 = x (m+1) and x2 = x (2*m+2) and x'1 = x m and x'2 = x (2*m) and
m < mu or (mu <= m and dist (m+1) (2*m+2) < dist m (2*m))
let rec run x1 x2 variant { (x1, x2) } with r =
{ exists m:int [x m]. x1 = x m and x2 = x (2*m) }
if x1 <> x2 then
run (f x1) (f (f x2))
{ }
end
(*
Local Variables:
compilecommand: "unset LANG; make C ../.. examples/programs/tortoise_hare.gui"
End:
*)
src/printer/alt_ergo.ml
View file @
c56d7aaa
...
...
@@ 102,8 +102,11 @@ let rec print_fmla info fmt f = match f.f_node with
(
print_list
comma
(
print_term
info
))
tl
end

Fquant
(
q
,
fq
)
>
let
q
=
match
q
with
Fforall
>
"forall"

Fexists
>
"exists"
in
let
vl
,
tl
,
f
=
f_open_quant
fq
in
let
q
,
tl
=
match
q
with

Fforall
>
"forall"
,
tl

Fexists
>
"exists"
,
[]
(* Altergo has no triggers for exists *)
in
let
forall
fmt
v
=
fprintf
fmt
"%s %a:%a"
q
print_ident
v
.
vs_name
(
print_type
info
)
v
.
vs_ty
in
...
...
@@ 141,8 +144,7 @@ and print_triggers info fmt tl =

Term
_
>
true

Fmla
{
f_node
=
Fapp
(
ps
,_
)}
>
not
(
ls_equal
ps
ps_equ
)

_
>
false
in
let
tl
=
List
.
map
(
List
.
filter
filter
)
tl
in
let
tl
=
List
.
map
(
List
.
filter
filter
)
tl
in
let
tl
=
List
.
filter
(
function
[]
>
false

_
::_
>
true
)
tl
in
if
tl
=
[]
then
()
else
fprintf
fmt
"@ [%a]"
(
print_list
alt
(
print_list
comma
(
print_expr
info
)))
tl
...
...
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment