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[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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