__builtin_alloca
ID0001190: This issue was created automatically from Mantis Issue 1190. Further discussion may take place here.
| Id | Project | Category | View | Due Date | Updated |
|---|---|---|---|---|---|
| ID0001190 | Frama-C | Kernel | public | 2012-06-08 | 2012-06-09 |
| Reporter | Anne | Assigned To | virgile | Resolution | open |
| Priority | normal | Severity | minor | Reproducibility | have not tried |
| Platform | - | OS | - | OS Version | - |
| Product Version | Frama-C Nitrogen-20111001 | Target Version | - | Fixed in Version | - |
Description :
In a file with a local array which size in defined by a variable : float a[n]; I get : [kernel] warning: Variable-sized local variable a which is ok. But then, when I use the value analysis, I get : [kernel] warning: No code for function __builtin_alloca, default assigns generated because the declaration has been translated in : __lengthofa = (unsigned int)n; a = (float *)__builtin_alloca(sizeof(*a) * __lengthofa); which looks fine, but the question is : shouldn't the assigns property be defined somewhere inside Frama-C for the builtin functions ? As a workaround, what prototype and assigns should I write for this function.