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adding farkas axiom to interpolation

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This commit is contained in:
Ken McMillan 2013-11-07 16:17:56 -08:00
parent cf176af48e
commit b076c152b3
1 changed files with 16 additions and 6 deletions
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22
src/interp/iz3translate.cpp
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@ -1253,13 +1253,23 @@ public:
case FarkasKind: {
std::vector<ast> farkas_coeffs, prem_cons;
get_farkas_coeffs(proof,farkas_coeffs);
if(farkas_coeffs.size() != nprems){
pfgoto(proof);
throw unsupported();
if(nprems == 0) {// axiom, not rule
int nargs = num_args(con);
if(farkas_coeffs.size() != nargs){
pfgoto(proof);
throw unsupported();
}
for(unsigned i = 0; i < nargs; i++){
ast lit = mk_not(arg(con,i));
prem_cons.push_back(lit);
args.push_back(iproof->make_hypothesis(lit));
}
}
else { // rule version (proves false)
prem_cons.resize(nprems);
for(unsigned i = 0; i < nprems; i++)
prem_cons[i] = conc(prem(proof,i));
}
prem_cons.resize(nprems);
for(unsigned i = 0; i < nprems; i++)
prem_cons[i] = conc(prem(proof,i));
res = iproof->make_farkas(con,args,prem_cons,farkas_coeffs);
break;
}