Symbiotic 5: Boosted Instrumentation

The fifth version of Symbiotic significantly improves instrumentation capabilities that the tool uses to participate in the category MemSafety. It leverages an extended pointer analysis re-designed for instrumenting programs with memory safety errors, and staged instrumentation reducing the number of inserted function calls that track or check the memory state. Apart from various bugfixes, we have ported Symbiotic (including the external symbolic executor Klee) to llvm 3.9 and improved the generation of violation witnesses by providing values of some variables.