Problem when arguments are not used in predicates
ID0001767: This issue was created automatically from Mantis Issue 1767. Further discussion may take place here.
| Id | Project | Category | View | Due Date | Updated |
|---|---|---|---|---|---|
| ID0001767 | Frama-C | Plug-in > wp | public | 2014-04-30 | 2015-03-17 |
| Reporter | davyg | Assigned To | correnson | Resolution | fixed |
| Priority | normal | Severity | minor | Reproducibility | always |
| Platform | - | OS | - | OS Version | - |
| Product Version | Frama-C Neon-20140301 | Target Version | - | Fixed in Version | Frama-C Sodium |
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)