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protecting add_simplifier API against mis-use

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-02-01 08:35:23 -08:00
parent 151a62338c
commit 19fed09122
2 changed files with 28 additions and 8 deletions
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34
src/api/api_solver.cpp
View file

@ -233,16 +233,38 @@ extern "C" {
Z3_CATCH_RETURN(nullptr);
}
/**
* attach a simplifier to solver.
* This is legal when the solver is fresh, does not already have assertions (and scopes).
* To allow recycling the argument solver, we create a fresh copy of it and pass it to
* mk_simplifier_solver.
*/
Z3_solver Z3_API Z3_solver_add_simplifier(Z3_context c, Z3_solver solver, Z3_simplifier simplifier) {
Z3_TRY;
LOG_Z3_solver_add_simplifier(c, solver, simplifier);
init_solver(c, solver);
solver_ref s_fresh;
if (to_solver(solver)->m_solver) {
s_fresh = to_solver_ref(solver)->translate(mk_c(c)->m(), to_solver(solver)->m_params);
}
else {
// create the solver, but hijack it for internal uses.
init_solver(c, solver);
s_fresh = to_solver(solver)->m_solver;
to_solver(solver)->m_solver = nullptr;
}
if (!s_fresh) {
SET_ERROR_CODE(Z3_INVALID_ARG, "unexpected empty solver state");
RETURN_Z3(nullptr);
}
if (s_fresh->get_num_assertions() > 0) {
SET_ERROR_CODE(Z3_INVALID_ARG, "adding a simplifier to a solver with assertions is not allowed.");
RETURN_Z3(nullptr);
}
auto simp = to_simplifier_ref(simplifier);
auto* slv = mk_simplifier_solver(to_solver_ref(solver), simp);
Z3_solver_ref* sr = alloc(Z3_solver_ref, *mk_c(c), slv);
mk_c(c)->save_object(sr);
// ?? init_solver_log(c, sr)
RETURN_Z3(of_solver(sr));
auto* simplifier_solver = mk_simplifier_solver(s_fresh.get(), simp);
Z3_solver_ref* result = alloc(Z3_solver_ref, *mk_c(c), simplifier_solver);
mk_c(c)->save_object(result);
RETURN_Z3(of_solver(result));
Z3_CATCH_RETURN(nullptr);
}

2
src/api/python/z3/z3.py
View file

@ -8214,8 +8214,6 @@ class Simplifier:
def add(self, solver):
"""Return a solver that applies the simplification pre-processing specified by the simplifier"""
print(solver.solver)
print(self.simplifier)
return Solver(Z3_solver_add_simplifier(self.ctx.ref(), solver.solver, self.simplifier), self.ctx)
def help(self):