////////////////////////////////////////////////////////////////////////////
private VCExpr AssembleOpExpression(OpTypesPair opTypes, IEnumerable <VCExpr /*!*/> /*!*/ oldArgs, VariableBindings bindings)
{
Contract.Requires(bindings != null);
Contract.Requires(cce.NonNullElements(oldArgs));
Contract.Ensures(Contract.Result <VCExpr>() != null);
// UGLY: the code for tracking polarities should be factored out
int oldPolarity = Eraser.Polarity;
Eraser.Polarity = 0;
List <VCExpr /*!*/> /*!*/ newArgs = new List <VCExpr /*!*/> ();
// explicit type parameters
foreach (Type /*!*/ t in opTypes.Types)
{
Contract.Assert(newArgs != null);
newArgs.Add(AxBuilder.Type2Term(t, bindings.TypeVariableBindings));
}
// and the actual value parameters
Function /*!*/ newFun = ((VCExprBoogieFunctionOp)opTypes.Op).Func;
// ^ we only allow this operator at this point
int i = opTypes.Types.Count;
foreach (VCExpr /*!*/ arg in oldArgs)
{
Contract.Assert(arg != null);
newArgs.Add(AxBuilder.Cast(Eraser.Mutate(arg, bindings),
cce.NonNull(newFun.InParams[i]).TypedIdent.Type));
i = i + 1;
}
Eraser.Polarity = oldPolarity;
return(Gen.Function(opTypes.Op, newArgs));
}
private VCExpr EqualTypes(Type t0, Type t1, VariableBindings bindings)
{
Contract.Requires(bindings != null);
Contract.Requires(t1 != null);
Contract.Requires(t0 != null);
Contract.Ensures(Contract.Result <VCExpr>() != null);
if (t0.Equals(t1))
{
return(VCExpressionGenerator.True);
}
VCExpr /*!*/ t0Expr = AxBuilder.Type2Term(t0, bindings.TypeVariableBindings);
Contract.Assert(t0Expr != null);
VCExpr /*!*/ t1Expr = AxBuilder.Type2Term(t1, bindings.TypeVariableBindings);
Contract.Assert(t1Expr != null);
return(Gen.Eq(t0Expr, t1Expr));
}
public override VCExpr VisitSubtypeOp(VCExprNAry node, VariableBindings bindings)
{
Contract.Requires((bindings != null));
Contract.Requires((node != null));
Contract.Ensures(Contract.Result <VCExpr>() != null);
// UGLY: the code for tracking polarities should be factored out
int oldPolarity = Eraser.Polarity;
Eraser.Polarity = 0;
VCExpr /*!*/ res =
Gen.Function(VCExpressionGenerator.Subtype3Op,
AxBuilder.Type2Term(node[0].Type,
bindings.TypeVariableBindings),
AxBuilder.Cast(Eraser.Mutate(node[0], bindings),
AxBuilder.U),
AxBuilder.Cast(Eraser.Mutate(node[1], bindings),
AxBuilder.U));
Eraser.Polarity = oldPolarity;
return(res);
}
