public virtual Expr NotEq(Expr lhs, Expr rhs)
{
return(UB.NotEq(lhs, rhs));
}
public void RemoveNoConstraintsBasedOnVarsAndFunctions()
{
IConstraintManager CM = new ConstraintManager();
IExprBuilder builder = GetBuilder();
// Dummy Boogie variable
var bv8Type = Microsoft.Boogie.Type.GetBvType(8);
var bv8TypeIdent = new TypedIdent(Token.NoToken, "bv8", bv8Type);
var dummyVarBv = new GlobalVariable(Token.NoToken, bv8TypeIdent);
// dummyVar needs a programLocation, otherwise SymbolicVariable constructor raises an exception
var progLoc = new ProgramLocation(dummyVarBv);
dummyVarBv.SetMetadata <ProgramLocation>((int)Symbooglix.Annotation.AnnotationIndex.PROGRAM_LOCATION, progLoc);
var s0 = new SymbolicVariable("s0", dummyVarBv).Expr;
var s1 = new SymbolicVariable("s1", dummyVarBv).Expr;
var s2 = new SymbolicVariable("s2", dummyVarBv).Expr;
// Construct some constraints
Expr c0 = builder.Eq(builder.BVAND(s0, s1), builder.ConstantBV(0, 8));
Expr c1 = builder.Eq(s2, builder.ConstantBV(1, 8));
var FCB = new FunctionCallBuilder();
var foobarFunc = FCB.CreateUninterpretedFunctionCall("foobar", bv8Type, new List <Microsoft.Boogie.Type>()
{
bv8Type
});
// foobar(0bv8) == 0bv8
Expr c2 = builder.Eq(builder.UFC(foobarFunc, builder.ConstantBV(0, 8)), builder.ConstantBV(0, 8));
CM.AddConstraint(c0, progLoc);
CM.AddConstraint(c1, progLoc);
CM.AddConstraint(c2, progLoc);
var mockSolver = new MockSolver();
var indepenceSolver = new Symbooglix.Solver.ConstraintIndependenceSolver(mockSolver);
// The query expression uses the "foobar" function so we need to keep constraints on that function
Expr queryExpr = builder.And(builder.Eq(builder.BVAND(s1, s2), builder.ConstantBV(0, 8)),
builder.NotEq(builder.UFC(foobarFunc, s1), s1)
);
indepenceSolver.ComputeSatisfiability(new Solver.Query(CM, new Constraint(queryExpr)));
// Check no constraints were removed
Assert.AreEqual(3, mockSolver.Constraints.Count);
Assert.AreSame(queryExpr, mockSolver.QueryExpr);
bool c0Found = false;
bool c1Found = false;
bool c2Found = false;
foreach (var constraint in mockSolver.Constraints)
{
if (c0 == constraint.Condition)
{
c0Found = true;
}
if (c1 == constraint.Condition)
{
c1Found = true;
}
if (c2 == constraint.Condition)
{
c2Found = true;
}
}
Assert.IsTrue(c0Found);
Assert.IsTrue(c1Found);
Assert.IsTrue(c2Found);
}
public override Expr VisitNAryExpr(NAryExpr node)
{
// Need to duplicate arguments first (doing post order traversal)
var newArgs = new List <Expr>();
foreach (var oldExpr in node.Args)
{
var newExpr = (Expr)this.Visit(oldExpr);
newArgs.Add(newExpr);
}
// Now can finally duplicate this node now we've done our children
if (node.Fun is FunctionCall)
{
var FC = (FunctionCall)node.Fun;
string bvbuiltin = QKeyValue.FindStringAttribute(FC.Func.Attributes, "bvbuiltin");
if (bvbuiltin != null)
{
return(HandleBvBuiltIns(FC, bvbuiltin, newArgs));
}
else
{
string builtin = QKeyValue.FindStringAttribute(FC.Func.Attributes, "builtin");
if (builtin != null)
{
return(HandleBuiltIns(FC, builtin, newArgs));
}
}
// Not a builtin so treat as uninterpreted function call
return(Builder.UFC(FC, newArgs.ToArray()));
}
else if (node.Fun is UnaryOperator)
{
var U = (UnaryOperator)node.Fun;
Debug.Assert(newArgs.Count == 1);
switch (U.Op)
{
case UnaryOperator.Opcode.Neg:
return(Builder.Neg(newArgs[0]));
case UnaryOperator.Opcode.Not:
return(Builder.Not(newArgs[0]));
default:
throw new NotImplementedException("Unary operator not supported");
}
}
else if (node.Fun is BinaryOperator)
{
var B = (BinaryOperator)node.Fun;
Debug.Assert(newArgs.Count == 2);
switch (B.Op)
{
// Integer or Real number operators
case BinaryOperator.Opcode.Add:
return(Builder.Add(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Sub:
return(Builder.Sub(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Mul:
return(Builder.Mul(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Div:
return(Builder.Div(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Mod:
return(Builder.Mod(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.RealDiv:
return(Builder.RealDiv(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Pow:
return(Builder.Pow(newArgs[0], newArgs[1]));
// Comparision operators
case BinaryOperator.Opcode.Eq:
return(Builder.Eq(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Neq:
return(Builder.NotEq(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Gt:
return(Builder.Gt(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Ge:
return(Builder.Ge(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Lt:
return(Builder.Lt(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Le:
return(Builder.Le(newArgs[0], newArgs[1]));
// Bool operators
case BinaryOperator.Opcode.And:
return(Builder.And(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Or:
return(Builder.Or(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Imp:
return(Builder.Imp(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Iff:
return(Builder.Iff(newArgs[0], newArgs[1]));
case BinaryOperator.Opcode.Subtype:
throw new NotImplementedException("SubType binary operator support not implemented");
default:
throw new NotSupportedException("Binary operator" + B.Op.ToString() + "not supported!");
}
}
else if (node.Fun is MapStore)
{
Debug.Assert(newArgs.Count >= 3);
// FIXME: We're probably making too many lists/arrays here
var map = newArgs[0];
var value = newArgs[newArgs.Count - 1]; // Last argument is value to store
var indices = new List <Expr>();
for (int index = 1; index < newArgs.Count - 1; ++index)
{
indices.Add(newArgs[index]);
}
Debug.Assert(indices.Count + 2 == newArgs.Count);
return(Builder.MapStore(map, value, indices.ToArray()));
}
else if (node.Fun is MapSelect)
{
// FIXME: We're probably making too many lists/arrays here
Debug.Assert(newArgs.Count >= 2);
var map = newArgs[0];
var indices = new List <Expr>();
for (int index = 1; index < newArgs.Count; ++index)
{
indices.Add(newArgs[index]);
}
Debug.Assert(indices.Count + 1 == newArgs.Count);
return(Builder.MapSelect(map, indices.ToArray()));
}
else if (node.Fun is IfThenElse)
{
Debug.Assert(newArgs.Count == 3);
return(Builder.IfThenElse(newArgs[0], newArgs[1], newArgs[2]));
}
else if (node.Fun is TypeCoercion)
{
// FIXME: Add support for this in the builder
// I don't want to put this into the IExprBuilder until I know
// exactly how this operator works and how it should be type checked
var immutableTC = new NAryExpr(Token.NoToken, node.Fun, newArgs, /*immutable=*/ true);
immutableTC.Type = node.Type;
return(immutableTC);
}
else if (node.Fun is ArithmeticCoercion)
{
Debug.Assert(newArgs.Count == 1);
var ac = node.Fun as ArithmeticCoercion;
return(Builder.ArithmeticCoercion(ac.Coercion, newArgs[0]));
}
throw new NotSupportedException("Unsupported NAryExpr");
}