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Add missing C# API functions for solver introspection and congruence closure (#8126)

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* Initial plan

* Add missing C# API functions for NonUnits, Trail, and Congruence methods

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Fix formatting: remove extra blank lines in new properties

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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Copilot 2026-01-08 18:46:47 -08:00 • committed by GitHub
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44
src/api/dotnet/NativeSolver.cs
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@ -277,6 +277,50 @@ namespace Microsoft.Z3
public Z3_ast[] Units
=> ntvContext.ToArray(Native.Z3_solver_get_units(nCtx, z3solver));
/// <summary>
/// Non-unit literals in the solver state.
/// </summary>
public Z3_ast[] NonUnits
=> ntvContext.ToArray(Native.Z3_solver_get_non_units(nCtx, z3solver));
/// <summary>
/// Trail of the solver state after a check() call.
/// </summary>
public Z3_ast[] Trail
=> ntvContext.ToArray(Native.Z3_solver_get_trail(nCtx, z3solver));
/// <summary>
/// Retrieve congruence closure root of the term t relative to the current search state.
/// The function primarily works for SimpleSolver.
/// Terms and variables that are eliminated during pre-processing are not visible to the congruence closure.
/// </summary>
public Z3_ast CongruenceRoot(Z3_ast t)
{
Debug.Assert(t != IntPtr.Zero);
return Native.Z3_solver_congruence_root(nCtx, z3solver, t);
}
/// <summary>
/// Retrieve congruence closure sibling of the term t relative to the current search state.
/// The function primarily works for SimpleSolver.
/// Terms and variables that are eliminated during pre-processing are not visible to the congruence closure.
/// </summary>
public Z3_ast CongruenceNext(Z3_ast t)
{
Debug.Assert(t != IntPtr.Zero);
return Native.Z3_solver_congruence_next(nCtx, z3solver, t);
}
/// <summary>
/// Explain congruence of a and b relative to the current search state.
/// </summary>
public Z3_ast CongruenceExplain(Z3_ast a, Z3_ast b)
{
Debug.Assert(a != IntPtr.Zero);
Debug.Assert(b != IntPtr.Zero);
return Native.Z3_solver_congruence_explain(nCtx, z3solver, a, b);
}
/// <summary>
/// Checks whether the assertions in the solver are consistent or not.
/// </summary>