can't prove (trivial) validity of memory access of "p->a"
ID0002112: This issue was created automatically from Mantis Issue 2112. Further discussion may take place here.
| Id | Project | Category | View | Due Date | Updated |
|---|---|---|---|---|---|
| ID0002112 | Frama-Clang | Plug-in > clang | public | 2015-05-04 | 2015-05-04 |
| Reporter | Jochen | Assigned To | virgile | Resolution | open |
| Priority | normal | Severity | minor | Reproducibility | always |
| Platform | Sodium-20150201 | OS | - | OS Version | xubuntu14.04 |
| Product Version | Frama-C Sodium | Target Version | - | Fixed in Version | - |
Description :
Running "frama-c -wp -wp-rte 477.cpp" on the attached program leaves an obligation "typed_main_assert_rte_mem_access" unproven by Alt-Ergo. It goal formula in file "main_assert_rte_mem_access_Alt-Ergo.mlw" reads:
576 goal main_assert_rte_mem_access: 577 forall t_1,t : int farray. 578 linked(t) -> 579 valid_rw(t_1, shiftfield_F__Z1X_a(shift__Z1X(global(L_x_111), 0)), 1)
When "t" is changed to "t_1" in line 578, the formaula is proven. This looks as if an "assigns" clause is missing for some operator. However, there is no user-defined operator involved here, so the necessary "assigns" clause should be generated by Frama-C.