Frama-C-discuss mailing list archives

This page gathers the archives of the old Frama-C-discuss archives, that was hosted by Inria's gforge before its demise at the end of 2020. To search for mails newer than September 2020, please visit the page of the new mailing list on Renater.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Frama-c-discuss] WP question

  • Subject: [Frama-c-discuss] WP question
  • From: dganesan at fc-md.umd.edu (Dharmalingam Ganesan)
  • Date: Mon, 3 Feb 2014 19:17:16 -0500
  • In-reply-to: <B517F47C2F6D914AA8121201F9EBEE6701C7660449B4@Mail1.FCMD.local>
  • References: <B517F47C2F6D914AA8121201F9EBEE6701C7660449B4@Mail1.FCMD.local>
Hi,

Never mind. I realized that the global variable's state has changed before the termination of the fucntion. I replaced one of the ensures by \old then the first behavior got satisfied.

Best regards,
Dharma

-----Original Message-----
From: frama-c-discuss-bounces at lists.gforge.inria.fr [mailto:frama-c-discuss-bounces at lists.gforge.inria.fr] On Behalf Of Dharmalingam Ganesan
Sent: Monday, February 03, 2014 5:15 PM
To: Frama-C public discussion
Subject: [Frama-c-discuss] WP question


Hi,

I used WP for the following two equivalent behaviours. I started with the first behaviour, WP claimed unknown.

behavior STOP_DRUG_MR_Pos:
      assumes msgId == MSG_CMD_STOP_DRUG;
      assumes gfMaintenance_Rate > 0;
      ensures gfPreviousMR == gfMaintenance_Rate;
      ensures gfMaintenance_Rate == 0;
      ensures gbDrugTerm == true;


I rewrote the above by the following. WP claimed valid. 

   behavior STOP_DRUG_MR_Pos_2:
      ensures msgId == MSG_CMD_STOP_DRUG && gfMaintenance_Rate > 0 ==> gfPreviousMR == gfMaintenance_Rate && gfMaintenance_Rate == 0 && gbDrugTerm == true;


I'm confused why the first one is considered unknown whereas the second one is valid, although both the behaviours are the same.

Any comments?
Dharma
_______________________________________________
Frama-c-discuss mailing list
Frama-c-discuss at lists.gforge.inria.fr
http://cp.mcafee.com/d/2DRPoOd3gQcCQmjhOyMU-UqehNKVJeXObP33WapJeXObP33Xz9JeXObP33Wb1JeXOrBS4TAPq17ovjo0FSNtl3CRkeZ1ISXoKGxPqG7uwSrtgohKWC_R-uhuouWZOWrbXT8I3DDQumKzp5dmXP_axVZicHs3jq9J4TvAm4TDNOb2pEVdTdw0PVkDjybE07-B2cJVSe08n8ixwCHIcfBisEeRNSeGWnIngBiPta6ToWHFuNt2lbdQEn8lrxrW0E-l9QUyW01_FgzbutyrososdCBInzGKBX5Q9kITixFtd402xoQg2PvQDaI3qpEVdEAQL