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Double SAT run for cex

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This commit is contained in:
Leonardo Alt
2020-07-23 18:49:03 +02:00
parent 694ec92688
commit 51721c3080
3 changed files with 64 additions and 12 deletions
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libsmtutil/Z3CHCInterface.cpp
+43 -12
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@@ -36,18 +36,7 @@ Z3CHCInterface::Z3CHCInterface():
z3::set_param("rewriter.pull_cheap_ite", true);
z3::set_param("rlimit", Z3Interface::resourceLimit);
// Spacer options.
// These needs to be set in the solver.
// https://github.com/Z3Prover/z3/blob/master/src/muz/base/fp_params.pyg
z3::params p(*m_context);
// These are useful for solving problems with arrays and loops.
// Use quantified lemma generalizer.
p.set("fp.spacer.q3.use_qgen", true);
p.set("fp.spacer.mbqi", false);
// Ground pobs by using values from a model.
p.set("fp.spacer.ground_pobs", false);
m_solver.set(p);
enablePreProcessing();
}
void Z3CHCInterface::declareVariable(string const& _name, SortPointer const& _sort)
@@ -115,6 +104,48 @@ pair<CheckResult, CHCSolverInterface::CexGraph> Z3CHCInterface::query(Expression
return {result, cex};
}
void Z3CHCInterface::enablePreProcessing()
{
// Spacer options.
// These needs to be set in the solver.
// https://github.com/Z3Prover/z3/blob/master/src/muz/base/fp_params.pyg
z3::params p(*m_context);
// These are useful for solving problems with arrays and loops.
// Use quantified lemma generalizer.
p.set("fp.spacer.q3.use_qgen", true);
p.set("fp.spacer.mbqi", false);
// Ground pobs by using values from a model.
p.set("fp.spacer.ground_pobs", false);
// Enable Spacer optimization for better solving.
p.set("fp.xform.slice", true);
p.set("fp.xform.inline_linear", true);
p.set("fp.xform.inline_eager", true);
m_solver.set(p);
}
void Z3CHCInterface::disablePreProcessing()
{
// Spacer options.
// These needs to be set in the solver.
// https://github.com/Z3Prover/z3/blob/master/src/muz/base/fp_params.pyg
z3::params p(*m_context);
// These are useful for solving problems with arrays and loops.
// Use quantified lemma generalizer.
p.set("fp.spacer.q3.use_qgen", true);
p.set("fp.spacer.mbqi", false);
// Ground pobs by using values from a model.
p.set("fp.spacer.ground_pobs", false);
// Disable Spacer optimization for counterexample generation.
p.set("fp.xform.slice", false);
p.set("fp.xform.inline_linear", false);
p.set("fp.xform.inline_eager", false);
m_solver.set(p);
}
/**
Convert a ground refutation into a linear or nonlinear counterexample.
The counterexample is given as an implication graph of the form