public void Remove_History()
{
ISet <string> keep = new HashSet <string>();
foreach (var v in this._tools.StateConfig.GetFlagOn())
{
using (BoolExpr expr = this.Create(v))
{
keep.Add(expr.ToString());
}
}
foreach (var v in this._tools.StateConfig.GetRegOn())
{
using (BitVecExpr expr = this.Create(v))
{
keep.Add(expr.ToString());
}
}
if (this._tools.StateConfig.mem)
{
using (ArrayExpr expr = Tools.Create_Mem_Key(this.HeadKey, this._ctx))
{
keep.Add(expr.ToString());
}
}
this.Compress(keep);
}
public BranchInfo(BoolExpr condition, bool taken)
{
Contract.Requires(condition != null);
this.BranchCondition = condition;
this.Key = condition.ToString();
this.BranchTaken = taken;
}
/// <summary>
/// Asserts the theorem constraints on the Z3 context.
/// </summary>
/// <param name="context">Z3 context.</param>
/// <param name="environment">Environment with bindings of theorem variables to Z3 handles.</param>
/// <typeparam name="T">Theorem environment type.</typeparam>
private void AssertConstraints <T>(Context context, Solver solver, Environment environment)
{
var constraints = _constraints;
//
// Global rewriter registered?
//
var rewriterAttr = (TheoremGlobalRewriterAttribute)typeof(T).GetCustomAttributes(typeof(TheoremGlobalRewriterAttribute), false).SingleOrDefault();
if (rewriterAttr != null)
{
//
// Make sure the specified rewriter type implements the ITheoremGlobalRewriter.
//
var rewriterType = rewriterAttr.RewriterType;
if (!typeof(ITheoremGlobalRewriter).IsAssignableFrom(rewriterType))
{
throw new InvalidOperationException("Invalid global rewriter type definition. Did you implement ITheoremGlobalRewriter?");
}
//
// Assume a parameterless public constructor to new up the rewriter.
//
var rewriter = (ITheoremGlobalRewriter)Activator.CreateInstance(rewriterType);
//
// Do the rewrite.
//
constraints = rewriter.Rewrite(constraints);
}
//
// Visit, assert and log.
//
foreach (var constraint in constraints)
{
BoolExpr c = (BoolExpr)Visit(context, environment, constraint.Body, constraint.Parameters[0]);
//context.AssertCnstr(c);
solver.Assert(c);
//_context.LogWriteLine(context.ToString(c));
_context.LogWriteLine(c.ToString());
}
}
public static bool isFlowChart(int n, int startIndex, Expr[,] R)
{
Trace.WriteLine("-----------------------------");
Trace.WriteLine($"In 'isFlowChart', n:{n}, startIndex:{startIndex}");
using (Context ctx = new Context())
{
var s = ctx.MkFixedpoint();
BoolSort B = ctx.BoolSort;
BitVecSort V = ctx.MkBitVecSort(S_BITVEC_SIZE);
//Function declarations
FuncDecl edge = ctx.MkFuncDecl("edge", new Sort[] { V, V }, B);
FuncDecl path = ctx.MkFuncDecl("path", new Sort[] { V, V }, B);
var x = (BitVecExpr)ctx.MkBound(0, V);
var y = (BitVecExpr)ctx.MkBound(1, V);
var z = (BitVecExpr)ctx.MkBound(2, V);
s.RegisterRelation(edge);
s.RegisterRelation(path);
//Recursive reachability rules - edge and path
//edge[x,y] => path[x,y]
//path[x,y] && path[y,z] => path[x,z]
s.AddRule(ctx.MkImplies((BoolExpr)edge[x, y], (BoolExpr)path[x, y]));
s.AddRule(ctx.MkImplies(ctx.MkAnd((BoolExpr)path[x, y], (BoolExpr)path[y, z]),
(BoolExpr)path[x, z]));
//Add a edge fact if R[i,j] == 1,
for (uint i = 0; i < n; i++)
{
for (uint j = 0; j < n; j++)
{
if (R[i, j].ToString().Equals("1"))
{
s.AddFact(edge, i, j);
}
}
}
//For every vertex other than startIndex, there
//should be a path from startIndex to vertex
BoolExpr start_c = ctx.MkTrue();
for (int i = 0; i < n; i++)
{
if (i != startIndex)
{
start_c = ctx.MkAnd((BoolExpr)path[ctx.MkBV(startIndex, S_BITVEC_SIZE), ctx.MkBV(i, S_BITVEC_SIZE)], start_c);
}
}
Trace.WriteLine(s.ToString());
Trace.WriteLine(start_c.ToString());
Trace.WriteLine("-----------------------------");
var status = s.Query(start_c);
if (status == Status.SATISFIABLE)
{
return(true);
}
else
{
Trace.WriteLine(s.GetAnswer());
Trace.WriteLine("fail");
return(false);
}
}
}
public BranchInfo(BoolExpr condition, bool taken)
{
this.BranchCondition = condition;
this.Key = condition.ToString();
this.BranchTaken = taken;
}