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| ID | Project | Category | View Status | Date Submitted | Last Update |
| 0001767 | Frama-C | Plug-in > wp | public | 2014-04-30 10:07 | 2015-03-17 22:17 |
|
| Reporter | davyg | |
| Assigned To | correnson | |
| Priority | normal | Severity | minor | Reproducibility | always |
| Status | closed | Resolution | fixed | |
| Platform | | OS | | OS Version | |
| Product Version | Frama-C Neon-20140301 | |
| Target Version | | Fixed in Version | Frama-C Sodium | |
|
| Summary | 0001767: Problem when arguments are not used in predicates |
| Description | The following example generates an error when it is exported to coq/why3 or alt-ergo.
/*@predicate p(double x, int y) = y;*/
/*@lemma lem : p((double) 0, (int) 1);*/
The why file generated by wp is the following one :
theory Axiomatic
...
predicate p_p (y_0 : int) = 0 <> y_0
lemma Q_lem: (p_p 1.0)
end
Wp detects that x is not used so it does not appear in why predicate p_p when it is used in Q_lem the correct value is taken(1) but its type is incorrect that's why wp put 1.0(a real) and not 1(an int) as argument. It takes the correct value : the one of the second argument in the original lemma but takes the type of the first argument to generate the constant and not the second one. |
| Steps To Reproduce | Write a file test.c with :
/*@predicate p(double x, int y) = y;*/
/*@lemma lem : p((double) 0, (int) 1);*/
And run frama-c -wp test.c
You will get the following error :
[kernel] preprocessing with "gcc -C -E -I. test.c"
[wp] Running WP plugin...
[wp] Collecting axiomatic usage
[wp] 1 goal scheduled
/tmp/wpd136d4.dir/typed/lemma_lem.ergo:9:[wp] user error: Alt-Ergo error:
characters 17-25:typing error: int and real cannot be unified
[wp] [Alt-Ergo] Goal typed_lemma_lem : Failed
Error: characters 17-25:typing error: int and real cannot be unified
[wp] Proved goals: 0 / 1
Alt-Ergo: 0 (failed: 1) |
| Tags | No tags attached. |
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