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[Frama-c-discuss] how padding are introduced by Frama-C

  • Subject: [Frama-c-discuss] how padding are introduced by Frama-C
  • From: stephane.duprat at atosorigin.com (Stéphane Duprat)
  • Date: Mon, 07 Dec 2009 23:33:22 +0100
Hi,

Here is an exemple where padding has a consequence on warnings.

These two structures differs only from the type of the first field.
typedef struct {
  int i;
  T_TAB t;
} T_S1;

typedef struct {
  char c;
  T_TAB t;
} T_S2;

The second one cause problem when used as in the attached exemple and I
don't know why.
Access to the field t in a loop causes a warning in the second case and
not in the first one.

test3.c:32:[kernel] warning: accessing uninitialized left-value *((char
*)(tV2[id].t) + i): assert(TODO)

Could someone explain me what happens.

thanks in advance,

St?phane




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