0000071: labels are not correctly translated in jessie+why

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0000071

Frama-C

Plug-in > jessie

public

2009-04-30 14:32

2010-12-09 19:19

Reporter

bobot

Assigned To

cmarche

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

fixed

Platform

OS Version

Product Version

Frama-C GIT, precise the release id

Target Version

Fixed in Version

Frama-C Beryllium-20090902

Summary

0000071: labels are not correctly translated in jessie+why

Description

An example with a label in a ghost (or not) statement,

label.c :
===============
void myfun(int p){
    p = 1;
    //@ ghost Mylabel:
    p = 2;
    //@ assert \at(p,Mylabel)==p-1;
}
====================

Why complains about an unbound label.

frama-c -jessie-analysis label.c :
===================================
[...]
File "why/label.why", line 350, characters 30-47:
Unbound label 'Mylabel'
===================================

In fact the label is defined in the jessie file.

label.jc :
===================================
unit myfun(int32 p)
behavior default:
  assumes true;
  ensures (C_4 : true);
{
   { (C_1 : (p = 1));
      (Mylabel : ());
      (C_2 : (p = 2));

      {
         (assert for default: (C_3 : (\at(p,Mylabel) == (p - 1))));
         ()
      };

      (return ())
   }
}
====================================

and in the why file, but perhaps not well scoped.

why/label.why :
====================================
let myfun_safety =
fun (p : int32) ->
  { (JC_4: true) }
  (let mutable_p = ref p in
  (init:
  try
   begin
     (C_1:
     (let jessie_1 = (mutable_p := (safe_int32_of_integer_ (1))) in void));
    (Mylabel:
    (let jessie_2 = (mutable_p := (safe_int32_of_integer_ (2))) in void));
    [ { } unit reads mutable_p
      { (JC_9:
        eq_int(integer_of_int32(mutable_p@Mylabel),
        sub_int(integer_of_int32(mutable_p), (1)))) } ];
    void;
    (raise Return);
    (raise Return)
   end
   with
   Return ->
   void end))
  { true }
=================================

Additional Information

frama-c release 5186

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Notes
(0000085) cmarche (developer) 2009-05-22 15:44	fixed in jessie tool (translation for jc to why was buggy)

(0000093) bobot (administrator) 2009-05-25 14:55	If an assert precede the label, the label is still not well scoped : label.c : =============== void myfun(int p){ p = 1; //@ assert \true; //@ ghost Mylabel: p = 2; //@ assert \at(p,Mylabel)==p-1; } ================

(0000464) signoles (manager) 2009-10-15 12:26	Fixed in Why 2.21

Issue History
Date Modified	Username	Field	Change
2009-04-30 14:32	bobot	New Issue
2009-04-30 14:59	signoles	Relationship added	duplicate of 0000063
2009-04-30 16:47	monate	Status	new => assigned
2009-04-30 16:47	monate	Assigned To	=> cmarche
2009-05-22 15:44	cmarche	Note Added: 0000085
2009-05-22 15:47	cmarche	Status	assigned => closed
2009-05-22 15:47	cmarche	Resolution	open => fixed
2009-05-25 14:55	bobot	Note Added: 0000093
2009-05-25 14:55	bobot	Status	closed => feedback
2009-05-25 14:55	bobot	Resolution	fixed => reopened
2009-06-05 12:32	cmarche	Status	feedback => acknowledged
2009-10-15 10:40	cmarche	Status	acknowledged => resolved
2009-10-15 12:25	signoles	Status	resolved => closed
2009-10-15 12:25	signoles	Fixed in Version	=> Frama-C Beryllium 2
2009-10-15 12:26	signoles	Note Added: 0000464
2010-12-09 19:19	signoles	Resolution	reopened => fixed