Frama-C This post is about widening. This technique was shown in the second part of a previous post about memcpy() where it was laboriously used to analyze imprecisely function memcpy() as it is usually written. The value analysis in Frama-C has the ability to summarize loops in less time than they...
Read MoreAnother facetious colleague reports a strange behavior with the following C program: int main (void) { int x = 100; int y = 042; int z = 005; printf (\%d" x+y+z); return (x+y+z) - 147; }
Read MoreSafe C interpreters galore The last release of CompCert includes a safe C interpreter based on the compiler's reference semantics. Like KCC and Frama-C's value analysis it detects a large class of undefined behaviors and some unspecified ones. Like them in order to remain useful it needs to make some...
Read MoreMore often than is good for me, I find someone on the internet saying something to the effect that \Frama-C only does intervals". Sadly I think I see what they mean. they may be of the school of thought that static analysis is abstract interpretation so that although Frama-C is...
Read MoreMany OCaml programmers use it because it offers a reasonable (to them) compromise between expressivity and control over resources use. Serious OCaml users are often heard complaining about relatively simple optimizations that the compiler does not have. But this reveals as much of the kind of programmers that end up...
Read More