Frama-C In the process of implementing the value analysis built-ins Frama_C_precise_sin() and Frama_C_precise_cos() from last post I stumbled on some interesting floating-point results. The sensationalistic title blames Linux but I didn't fully investigate the problem yet and it could be somewhere else. If you have the Frama-C sources lying around you...
Read MoreThis 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...
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