private static void AnalyzeMethod(SyntaxNodeAnalysisContext context)
{
Contract.Requires(!false);
try
{
using (Context ctx = new Context())
{
var method = new Method(context.Node, context, ctx);
Solve(method);
}
}
catch (Exception ex)
{
context.ReportDiagnostic(Diagnostic.Create
(
DiagnosticDefinition.Get("RA0003"),
context.Node.GetLocation(),
ex
));
}
}
private static void Solve(Method context)
{
var solver = context.Z3.MkSimpleSolver();
BoolExpr requireCondition;
if (context.Requires.Take(2).Count() == 2)
{
requireCondition = context.Z3.MkAnd(context.Requires);
}
else if (context.Requires.Any())
{
requireCondition = context.Requires.First();
}
else
{
// no requires
return;
}
requireCondition = requireCondition.Simplify() as BoolExpr;
solver.Add(requireCondition);
var status = solver.Check();
if (status == Status.SATISFIABLE)
{
StringBuilder sb = new StringBuilder();
foreach (var condition in context.Parameters.SelectMany(p => p.AllNamedExpressions))
{
var val = solver.Model.Eval(condition.Value);
sb.Append(condition.Key);
sb.Append(" => ");
sb.AppendLine(val.ToString());
}
foreach (var location in context.RequireConditions.Select(c => c.GetLocation()))
{
context.NodeAnalysisContext.ReportDiagnostic(Diagnostic.Create
(
DiagnosticDefinition.Get("RA0000"),
location,
sb.ToString()
));
}
return;
}
if (status == Status.UNSATISFIABLE)
{
StringBuilder sb = new StringBuilder();
foreach (BoolExpr c in solver.UnsatCore)
{
sb.AppendFormat("{0}", c);
sb.AppendLine();
}
foreach (var location in context.RequireConditions.Select(c => c.GetLocation()))
{
context.NodeAnalysisContext.ReportDiagnostic(Diagnostic.Create
(
DiagnosticDefinition.Get("RA0001"),
location,
requireCondition
));
}
return;
}
if (status == Status.UNKNOWN)
{
foreach (var location in context.RequireConditions.Select(c => c.GetLocation()))
{
context.NodeAnalysisContext.ReportDiagnostic(Diagnostic.Create
(
DiagnosticDefinition.Get("RA0002"),
location,
requireCondition
));
}
return;
}
}