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[Frama-c-discuss] don't want unitialized padding fields, -initialized-padding-globals

Hello,

Shall I post this to the tracker ?

St?phane

From: Frama-c-discuss [mailto:frama-c-discuss-bounces at lists.gforge.inria.fr] On Behalf Of DUPRAT, STEPHANE
Sent: Thursday, November 06, 2014 2:33 PM
To: Frama-C public discussion
Subject: Re: [Frama-c-discuss] don't want unitialized padding fields, -initialized-padding-globals

Hello Pascal,

You example is also working well also on my side.

But the result is different with these options:

frama-c -val t.c -main f1 -val-warn-copy-indeterminate @all -pp-annot -no-val-show-initial-state -initialized-padding-globals -lib-entry -no-unicode -continue-annot-error -context-valid-pointers -context-depth 2 -context-width 1 -val-print-callstacks -slevel 400

[value] ====== VALUES COMPUTED ======
[value] Values at end of function f1:
  Frama_C_entropy_source IN [--..--]
  Gtab1[0].a[0..2] IN [--..--]
       [0].[bits 24 to 31] IN [--..--] or UNINITIALIZED
       {[0].b; [1].a[0..2]} IN [--..--]
       [1].[bits 24 to 31] IN [--..--] or UNINITIALIZED
       {[1].b; [2].a[0..2]} IN [--..--]

Regards,

St?phane


From: Frama-c-discuss [mailto:frama-c-discuss-bounces at lists.gforge.inria.fr] On Behalf Of Pascal Cuoq
Sent: Thursday, November 06, 2014 1:25 PM
To: Frama-C public discussion
Subject: Re: [Frama-c-discuss] don't want unitialized padding fields, -initialized-padding-globals

It works for me. Did you provide the specification for Frama_C_make_unknown that David gave? It doesn't work if it's not provided.


~ $ cat t.c

int Frama_C_entropy_source;



typedef unsigned long size_t;



/*@ requires \valid(p + (0 .. l-1));

    assigns p[0 .. l-1] \from Frama_C_entropy_source;

    assigns Frama_C_entropy_source \from Frama_C_entropy_source;

    ensures \initialized(p + (0 .. l-1));

*/

void Frama_C_make_unknown(char *p, size_t l);



typedef struct {

  char a[3];

  int b;

} T_S1;



typedef T_S1 T_T1[1000];



T_T1 Gtab1;

T_T1 Gtab_witness;

T_S1 G2;



void f1(T_S1* p1)

{

  Frama_C_make_unknown(Gtab1, sizeof(T_T1));

  Frama_C_make_unknown(&G2, sizeof(T_S1));

  Frama_C_dump_each();

}



~ $ frama-c -val t.c -main f1

?

[value] DUMPING STATE of file t.c line 27

        Frama_C_entropy_source ? [--..--]

        Gtab1[0..999] ? [--..--]

        Gtab_witness[0..999] ? {0}

        G2 ? [--..--]

        p1 ? {‌{ NULL ; &S_p1[0] }‌}

        S_p1[0].a[0..2] ? [--..--]

            [0].[bits 24 to 31] ? UNINITIALIZED

            {[0].b; [1].a[0..2]} ? [--..--]

            [1].[bits 24 to 31] ? UNINITIALIZED

            [1].b ? [--..--]

        =END OF DUMP==



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Ce message et toutes les pi?ces jointes (ci-apr?s le "message") sont ?tablis ? l?intention exclusive des destinataires d?sign?s. Il contient des informations confidentielles et pouvant ?tre prot?g? par le secret professionnel. Si vous recevez ce message par erreur, merci d'en avertir imm?diatement l'exp?diteur et de d?truire le message. Toute utilisation de ce message non conforme ? sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse de l??metteur. L'internet ne garantissant pas l'int?grit? de ce message lors de son acheminement, Atos (et ses filiales) d?cline(nt) toute responsabilit? au titre de son contenu. Bien que ce message ait fait l?objet d?un traitement anti-virus lors de son envoi, l??metteur ne peut garantir l?absence totale de logiciels malveillants dans son contenu et ne pourrait ?tre tenu pour responsable des dommages engendr?s par la transmission de l?un d?eux.

This message and any attachments (the "message") are intended solely for the addressee(s). It contains confidential information, that may be privileged. If you receive this message in error, please notify the sender immediately and delete the message. Any use of the message in violation of its purpose, any dissemination or disclosure, either wholly or partially is strictly prohibited, unless it has been explicitly authorized by the sender. As its integrity cannot be secured on the internet, Atos and its subsidiaries decline any liability for the content of this message. Although the sender endeavors to maintain a computer virus-free network, the sender does not warrant that this transmission is virus-free and will not be liable for any damages resulting from any virus transmitted.
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