assigns clauses are missing from the sliced program

ID0000393: This issue was created automatically from Mantis Issue 393. Further discussion may take place here.

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Id	Project	Category	View	Due Date	Updated
ID0000393	Frama-C	Plug-in > slicing	public	2010-02-04	2010-04-13

Reporter	pascal	Assigned To	Anne	Resolution	fixed
Priority	normal	Severity	feature	Reproducibility	always
Platform	-	OS	-	OS Version	-
Product Version	-	Target Version	-	Fixed in Version	Frama-C Boron-20100401

Description :

When the original program contains assigns clauses for functions with code, the assigns are always omitted from the generated sliced program.

On the other hand pre- and post-conditions seem to be properly included.

In the attached example, the command produces a sliced program that contains:

/*@ requires \valid(p); behavior default: ensures (p->a > p->b); */ void g_slice_1(las *p ) { ...

The expected behavior is for g_slice_1 to contain in its contract the clause: assigns p->a; in addition to the requires and ensures.

Additional Information :

frama-c -slicing-level 3 -slicing-keep-annotations -slice-assert main -slice-print -ocode slice.foo.c -main main -lib-entry -no-unicode -context-valid-pointers foo.c

pragma JessieIntegerModel(exact)

typedef struct las { int a; int b; } las;

/*@ requires \valid(p); assigns p->a; ensures p->a>p->b; */ void f(las * p){ p->a = p->b + 1;}

/*@ requires \valid(p); assigns p->a; ensures p->a>p->b; */ void g(las * p) { f(p); }

/*@ requires \valid(p); assigns p->a; ensures p->a>p->b; */ void main(las * p) { g(p); //@ assert p->a>p->b; }