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/******************************************************************************
* Top contributors (to current version):
* Aina Niemetz, Andrew Reynolds
*
* This file is part of the cvc5 project.
*
* Copyright (c) 2009-2025 by the authors listed in the file AUTHORS
* in the top-level source directory and their institutional affiliations.
* All rights reserved. See the file COPYING in the top-level source
* directory for licensing information.
* ****************************************************************************
*
* Black box testing of proof-related functions of the C API.
*/
extern "C" {
#include <cvc5/c/cvc5.h>
}
#include "base/check.h"
#include "base/output.h"
#include "gtest/gtest.h"
namespace cvc5::internal::test {
class TestCApiBlackProof : public ::testing::Test
{
protected:
void SetUp() override
{
d_tm = cvc5_term_manager_new();
d_solver = cvc5_new(d_tm);
d_bool = cvc5_get_boolean_sort(d_tm);
d_int = cvc5_get_integer_sort(d_tm);
d_real = cvc5_get_real_sort(d_tm);
d_str = cvc5_get_string_sort(d_tm);
d_uninterpreted = cvc5_mk_uninterpreted_sort(d_tm, "u");
}
void TearDown() override
{
cvc5_delete(d_solver);
cvc5_term_manager_delete(d_tm);
}
Cvc5Proof create_proof()
{
cvc5_set_option(d_solver, "produce-proofs", "true");
std::vector<Cvc5Sort> domain = {d_uninterpreted};
Cvc5Sort u_to_int =
cvc5_mk_fun_sort(d_tm, domain.size(), domain.data(), d_int);
domain = {d_int};
Cvc5Sort int_pred =
cvc5_mk_fun_sort(d_tm, domain.size(), domain.data(), d_bool);
Cvc5Term x = cvc5_mk_const(d_tm, d_uninterpreted, "x");
Cvc5Term y = cvc5_mk_const(d_tm, d_uninterpreted, "y");
Cvc5Term f = cvc5_mk_const(d_tm, u_to_int, "f");
Cvc5Term p = cvc5_mk_const(d_tm, int_pred, "p");
Cvc5Term zero = cvc5_mk_integer_int64(d_tm, 0);
Cvc5Term one = cvc5_mk_integer_int64(d_tm, 1);
std::vector<Cvc5Term> args = {f, x};
Cvc5Term f_x =
cvc5_mk_term(d_tm, CVC5_KIND_APPLY_UF, args.size(), args.data());
args = {f, y};
Cvc5Term f_y =
cvc5_mk_term(d_tm, CVC5_KIND_APPLY_UF, args.size(), args.data());
args = {f_x, f_y};
Cvc5Term sum = cvc5_mk_term(d_tm, CVC5_KIND_ADD, args.size(), args.data());
args = {p, zero};
Cvc5Term p_0 =
cvc5_mk_term(d_tm, CVC5_KIND_APPLY_UF, args.size(), args.data());
args = {p, f_y};
Cvc5Term p_f_y =
cvc5_mk_term(d_tm, CVC5_KIND_APPLY_UF, args.size(), args.data());
args = {zero, f_x};
cvc5_assert_formula(
d_solver, cvc5_mk_term(d_tm, CVC5_KIND_GT, args.size(), args.data()));
args = {zero, f_y};
cvc5_assert_formula(
d_solver, cvc5_mk_term(d_tm, CVC5_KIND_GT, args.size(), args.data()));
args = {sum, one};
cvc5_assert_formula(
d_solver, cvc5_mk_term(d_tm, CVC5_KIND_GT, args.size(), args.data()));
cvc5_assert_formula(d_solver, p_0);
args = {p_f_y};
cvc5_assert_formula(
d_solver, cvc5_mk_term(d_tm, CVC5_KIND_NOT, args.size(), args.data()));
Cvc5Result res = cvc5_check_sat(d_solver);
Assert(cvc5_result_is_unsat(res));
size_t size;
const Cvc5Proof* proofs =
cvc5_get_proof(d_solver, CVC5_PROOF_COMPONENT_FULL, &size);
Assert(size == 1);
return proofs[0];
}
Cvc5Proof create_rewrite_proof()
{
cvc5_set_option(d_solver, "produce-proofs", "true");
cvc5_set_option(d_solver, "proof-granularity", "dsl-rewrite");
Cvc5Term x = cvc5_mk_const(d_tm, d_int, "x");
Cvc5Term zero = cvc5_mk_integer_int64(d_tm, 2);
std::vector<Cvc5Term> args = {x, zero};
Cvc5Term geq =
cvc5_mk_term(d_tm, CVC5_KIND_GEQ, args.size(), args.data());
args = {zero, x};
Cvc5Term leq =
cvc5_mk_term(d_tm, CVC5_KIND_LEQ, args.size(), args.data());
args = {geq, leq};
cvc5_assert_formula(
d_solver,
cvc5_mk_term(d_tm, CVC5_KIND_DISTINCT, args.size(), args.data()));
Cvc5Result res = cvc5_check_sat(d_solver);
Assert(cvc5_result_is_unsat(res));
size_t size;
const Cvc5Proof* proofs =
cvc5_get_proof(d_solver, CVC5_PROOF_COMPONENT_FULL, &size);
Assert(size == 1);
return proofs[0];
}
Cvc5TermManager* d_tm;
Cvc5* d_solver;
Cvc5Sort d_bool;
Cvc5Sort d_int;
Cvc5Sort d_real;
Cvc5Sort d_str;
Cvc5Sort d_uninterpreted;
};
TEST_F(TestCApiBlackProof, get_rule)
{
ASSERT_DEATH(cvc5_proof_get_rule(nullptr), "invalid proof");
Cvc5Proof proof = create_proof();
ASSERT_EQ(cvc5_proof_get_rule(proof), CVC5_PROOF_RULE_SCOPE);
}
TEST_F(TestCApiBlackProof, get_rewrite_rule)
{
ASSERT_DEATH(cvc5_proof_get_rewrite_rule(nullptr), "invalid proof");
Cvc5Proof proof = create_rewrite_proof();
ASSERT_DEATH(cvc5_proof_get_rewrite_rule(proof), "to return `DSL_REWRITE`");
Cvc5ProofRule rule;
std::vector<Cvc5Proof> stack = {proof};
do
{
proof = stack.back();
stack.pop_back();
rule = cvc5_proof_get_rule(proof);
size_t size;
const Cvc5Proof* children = cvc5_proof_get_children(proof, &size);
for (size_t i = 0; i < size; ++i)
{
stack.push_back(children[i]);
}
} while (rule != CVC5_PROOF_RULE_DSL_REWRITE);
(void)cvc5_proof_get_rewrite_rule(proof);
}
TEST_F(TestCApiBlackProof, get_result)
{
ASSERT_DEATH(cvc5_proof_get_result(nullptr), "invalid proof");
Cvc5Proof proof = create_proof();
(void)cvc5_proof_get_result(proof);
}
TEST_F(TestCApiBlackProof, get_children)
{
Cvc5Proof proof = create_proof();
size_t size;
(void)cvc5_proof_get_children(proof, &size);
ASSERT_TRUE(size > 0);
ASSERT_DEATH(cvc5_proof_get_children(nullptr, &size), "invalid proof");
ASSERT_DEATH(cvc5_proof_get_children(proof, nullptr),
"unexpected NULL argument");
}
TEST_F(TestCApiBlackProof, get_arguments)
{
Cvc5Proof proof = create_proof();
size_t size;
(void)cvc5_proof_get_arguments(proof, &size);
ASSERT_DEATH(cvc5_proof_get_arguments(nullptr, &size), "invalid proof");
ASSERT_DEATH(cvc5_proof_get_arguments(proof, nullptr),
"unexpected NULL argument");
}
TEST_F(TestCApiBlackProof, is_equal_disequal_hash)
{
Cvc5Proof proof = create_proof();
size_t size;
Cvc5Proof x = cvc5_proof_get_children(proof, &size)[0];
Cvc5Proof y = cvc5_proof_get_children(x, &size)[0];
ASSERT_TRUE(cvc5_proof_is_equal(x, x));
ASSERT_FALSE(cvc5_proof_is_disequal(x, x));
ASSERT_FALSE(cvc5_proof_is_equal(x, y));
ASSERT_TRUE(cvc5_proof_is_disequal(x, y));
ASSERT_TRUE(cvc5_proof_is_equal(nullptr, nullptr));
ASSERT_FALSE(cvc5_proof_is_equal(x, nullptr));
ASSERT_FALSE(cvc5_proof_is_equal(nullptr, y));
ASSERT_TRUE(cvc5_proof_is_disequal(x, nullptr));
ASSERT_TRUE(cvc5_proof_is_disequal(nullptr, y));
ASSERT_EQ(cvc5_proof_hash(x), cvc5_proof_hash(x));
ASSERT_NE(cvc5_proof_hash(x), cvc5_proof_hash(y));
ASSERT_DEATH(cvc5_proof_hash(nullptr), "invalid proof");
}
TEST_F(TestCApiBlackProof, copy_release)
{
ASSERT_DEATH(cvc5_proof_copy(nullptr), "invalid proof");
ASSERT_DEATH(cvc5_proof_release(nullptr), "invalid proof");
Cvc5Proof proof = create_proof();
ASSERT_EQ(cvc5_proof_get_rule(proof), CVC5_PROOF_RULE_SCOPE);
Cvc5Proof proof2 = cvc5_proof_copy(proof);
ASSERT_EQ(cvc5_proof_get_rule(proof), CVC5_PROOF_RULE_SCOPE);
ASSERT_EQ(cvc5_proof_get_rule(proof2), CVC5_PROOF_RULE_SCOPE);
ASSERT_TRUE(cvc5_proof_is_equal(proof, proof2));
cvc5_proof_release(proof);
ASSERT_EQ(cvc5_proof_get_rule(proof), CVC5_PROOF_RULE_SCOPE);
ASSERT_EQ(cvc5_proof_get_rule(proof2), CVC5_PROOF_RULE_SCOPE);
cvc5_proof_release(proof);
// we cannot reliably check that querying on the (now freed) proof fails
// unless ASAN is enabled
}
} // namespace cvc5::internal::test
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