K-user mailing list

[Andrei Arusoaie <andrei.arusoaie AT gmail.com>]

I’ve done the following experiment (please note the commented line no 4 in smt.k) and it works for me:

[andrei]-$ cat /home/andrei/Downloads/k/include/builtins/smt.k
// Copyright (c) 2012-2014 K Team. All Rights Reserved.
require "builtins/builtins.k"
require "builtins/fol.k"
// require "builtins/array-symbolic.k"

module SMTLIB-CONVERSION
  imports BUILTIN-HOOKS
  imports FOL
  ...
  

[andrei]-$ cat temp.k
require "builtins/smt.k"

module TEMP

  configuration <k> checkSat(4 >Int 4) </k>

endmodule
[andrei]-$ ./kompile --version
K-framework version 3.4.
Git Revision: 08c9271
Build date: Tue Aug 26 13:56:56 PDT 2014

[andrei]-$ ./kompile temp.k 

[andrei]-$ ./krun 
<k>
    "unsat"
</k>

Andrei

​

2017-05-11 15:19 GMT+03:00 Andrei Arusoaie <andrei.arusoaie AT gmail.com>:

Hi,

Can you attach a simple K file which can reproduce the bug?

Andrei

2017-05-11 10:27 GMT+03:00 <daparpon AT dsic.upv.es>:

Hi, Andrei.

Please can you give me any recommendations regarding this problem? Since I'm
not able to make K interact with the SMT solver, I'm stuck in this phase of my
research.

Thanks in advance,
Daniel

--------------------------------------------------------------------------------------------------
2017-04-28 13:25 GMT+03:00 <daparpon AT dsic.upv.es>:

Nope, it does not. I tried commenting the "require array-symbolic.k" clause
and I obtained other kompiling errors and warnings, specifically the following
ones:

[Warning] Compiler: Associativity attribute should only be assigned to binary
infix production.

File: /Users/ELP/Documents/k/include/builtins/fol.k
Location: (14,18,14,57)
Compilation Phase: class org.kframework.compile.checks.CheckSyntaxDecl

[Warning] Compiler: Associativity attribute should only be assigned to binary
infix production.

File: /Users/ELP/Documents/k/include/builtins/fol.k
Location: (15,18,15,57)
Compilation Phase: class org.kframework.compile.checks.CheckSyntaxDecl

[Error] Critical: Parse error: Syntax error near unexpected character 'y'
File: /Users/ELP/Documents/k/include/builtins/smt.k
Location: (17,16,17,16)

To be more precise, the line which the error refers to is:

rule Smtlib(symBool(I:Int)) => "var" +String Int2String(I)

and the location reference points to the 'y' in "symBool(I:Int)".

Daniel

--------------------------------------------------------------------------------------------------
2017-04-28 13:16 GMT+03:00 <andrei.arusoaie AT gmail.com>:

That's weird...
Anyway, I think you can comment the line which include array-symbolic.k from /
k/include/builtins/smt.k.
Does it work if you do that?

2017-04-28 13:12 GMT+03:00 <daparpon AT dsic.upv.es>:

Hi! I tried to import the module you refer to (and insert the proper "
require
"builtins/smt.k" " clause) in order to use the checkSat function in my
language. However, when I kompile the resulting specification, I get the
following error message:

[Error] Critical: Could not find 'required' file: builtins/array-
symbolic.k
File: <filepath to K>/k/include/builtins/smt.k
Location: (4,1,4,35)

I have looked for the "array-symbolic.k" file in both my file system and
previous distributions of the K Framework, but I could not find it
anywhere.
How can I solve this dependency and work with the "smt.k" file?

Thanks in advance,
Daniel

From: Andrei Arusoaie <andrei.arusoaie AT gmail.com>
Date: 2017-04-12 19:47 GMT+03:00
Subject: Re: [[K-user] ] Calling SMT Solver from K specification
To: daparpon AT dsic.upv.es


Hi Daniel,

If you’re using K-3.4 then you can take a look at k/include/builtins/
smt.k,
specifically in module:

module SMT-SYNTAX-HOOKS

syntax SmtResponse ::= "sat"
| "unsat"
| "unknown"
| "model" "(" Map ")"

syntax SmtResponse ::= "checkSat" "(" K ")" [function]
| "getModel" "(" K ")" [function]

syntax Bool ::= SmtResponse "=/=" SmtResponse
| SmtResponse "==" SmtResponse
endmodule

I think checkSat is what you’re looking for. Make sure you pass a Bool to
it.
If you need more, you can extend the module to translate whatever exp to
SMTLib as we implicitly did for ints and bools (check the entire smt.k
file
for details).

Andrei A.
​

2017-04-12 17:07 GMT+03:00 <daparpon AT dsic.upv.es>:

What I need to do is to compare two symbolic execution states, S1 and
S2,
which respectively contain the path conditions PC1 and PC2. The
comparison
is
simply done by checking whether the implication PC1 => PC2 holds. For
instance, this is a valid implication, where each ?vi is a symbolic
value

(?v1 < ?v3 ^ ?v3 < ?v2) => (?v1 <= ?v2)

Since path conditions are logical expressions involving symbolic data,
the
implication cannot be solved by means of K's boolean operators but I
need
to
delegate this problem to a SAT/SMT Solver.

How can I send the constraint to the SAT solver and get the solver
verdict
in
return?

I am still using K 3.4 since I need to read the path-condition cell
during
symbolic execution, while K 4.0 does not have this capability
available
yet.

Thanks a lot and sorry for the inconveniencies. Best regards,
Daniel
________________________________________
From:
yzhng173 AT illinois.edu

[yzhng173 AT illinois.edu]
Sent: Tuesday, April 11, 2017 9:16 AM
To:
k-user AT lists.cs.illinois.edu
Subject: RE: [[K-user] ] Calling SMT Solver from K specification

Hi Daniel,

The current Java backend is using Z3 in the symbolic execution engine
internally and it is not exposed to the user. Could you please tell us
more
specifically about your use cases?

Best,

Yi
________________________________________
From:
daparpon AT dsic.upv.es

[daparpon AT dsic.upv.es]
Sent: Tuesday, April 11, 2017 4:01 AM
To:
k-user AT lists.cs.illinois.edu
Subject: [[K-user] ] Calling SMT Solver from K specification

Hi! I am implementing a part of my K language specification which
needs to
check a boolean formula for satisfiability/validity. How can I do that
in
K?
Are there any built-in commands or terms that allow K rules to
communicate
with an SMT Solver, for instance Z3? In that case, which are they (or
where
can I find more information about them)?

Thanks in advance,
Daniel