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Instrumenting special assert in CPROVER_START after call into the function under test. (#398) #1018

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Merged
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Jun 20, 2017
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Instrumenting special assert in CPROVER_START after call into the function under test. (#398) #1018

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27 changes: 27 additions & 0 deletions src/goto-instrument/cover.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1461,6 +1461,33 @@ bool instrument_cover_goals(
cmdline.isset("no-trivial-tests"));
}

if(cmdline.isset("cover-traces-must-terminate"))
{
// instrument an additional goal in CPROVER_START. This will rephrase
// the reachability problem by asking BMC to provide a solution that
// satisfies a goal while getting to the end of the program-under-test.
const auto sf_it=
goto_functions.function_map.find(goto_functions.entry_point());
if(sf_it==goto_functions.function_map.end())
{
msg.error() << "cover-traces-must-terminate: invalid entry point ["
<< goto_functions.entry_point() << "]"
<< messaget::eom;
return true;
}
auto if_it=sf_it->second.body.instructions.end();
while(!if_it->is_function_call())
if_it--;
if_it++;
const std::string &comment=
"additional goal to ensure complete trace coverage.";
sf_it->second.body.insert_before_swap(if_it);
if_it->make_assertion(false_exprt());
if_it->source_location.set_comment(comment);
if_it->source_location.set_property_class("reachability_constraint");
if_it->source_location.set_function(if_it->function);
}

goto_functions.update();
return false;
}