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add basic built-in consequence finding

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2016-07-28 11:20:17 -07:00
parent b7de813c63
commit 14f29e7265
6 changed files with 200 additions and 13 deletions
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48
src/api/dotnet/Solver.cs
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@ -18,6 +18,7 @@ Notes:
--*/
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
namespace Microsoft.Z3
@ -212,12 +213,34 @@ namespace Microsoft.Z3
r = (Z3_lbool)Native.Z3_solver_check(Context.nCtx, NativeObject);
else
r = (Z3_lbool)Native.Z3_solver_check_assumptions(Context.nCtx, NativeObject, (uint)assumptions.Length, AST.ArrayToNative(assumptions));
switch (r)
{
case Z3_lbool.Z3_L_TRUE: return Status.SATISFIABLE;
case Z3_lbool.Z3_L_FALSE: return Status.UNSATISFIABLE;
default: return Status.UNKNOWN;
}
return lboolToStatus(r);
}
/// <summary>
/// Retrieve fixed assignments to the set of variables in the form of consequences.
/// Each consequence is an implication of the form
///
/// relevant-assumptions Implies variable = value
///
/// where the relevant assumptions is a subset of the assumptions that are passed in
/// and the equality on the right side of the implication indicates how a variable
/// is fixed.
/// </summary>
/// <remarks>
/// <seealso cref="Model"/>
/// <seealso cref="UnsatCore"/>
/// <seealso cref="Proof"/>
/// </remarks>
public Status Consequences(IEnumerable<BoolExpr> assumptions, IEnumerable<Expr> variables, out BoolExpr[] consequences)
{
ASTVector result = new ASTVector(Context);
ASTVector asms = new ASTVector(Context);
ASTVector vars = new ASTVector(Context);
foreach (var asm in assumptions) asms.Push(asm);
foreach (var v in variables) vars.Push(v);
Z3_lbool r = (Z3_lbool)Native.Z3_solver_get_consequences(Context.nCtx, NativeObject, asms.NativeObject, vars.NativeObject, result.NativeObject);
consequences = result.ToBoolExprArray();
return lboolToStatus(r);
}
/// <summary>
@ -295,7 +318,7 @@ namespace Microsoft.Z3
/// </summary>
public Solver Translate(Context ctx)
{
Contract.Requires(ctx != null);
Contract.Requires(ctx != null);
Contract.Ensures(Contract.Result<Solver>() != null);
return new Solver(ctx, Native.Z3_solver_translate(Context.nCtx, NativeObject, ctx.nCtx));
}
@ -355,6 +378,17 @@ namespace Microsoft.Z3
Context.Solver_DRQ.Add(o);
base.DecRef(o);
}
private Status lboolToStatus(Z3_lbool r)
{
switch (r)
{
case Z3_lbool.Z3_L_TRUE: return Status.SATISFIABLE;
case Z3_lbool.Z3_L_FALSE: return Status.UNSATISFIABLE;
default: return Status.UNKNOWN;
}
}
#endregion
}
}