private Pair<Statement, string> PreparePurityWarning(VariableEffect vEffect)
{
Pair<Statement, string> res = null;
// Add the path (decorated with text) to the set of warnings to inform to the developer
string path = vEffect.ToString();
Label lb = vEffect.Label;
Variable v = vEffect.Variable;
Statement stat = lb.Statement;
if (stat != null)
{
if (vEffect.Variable is Parameter)
{
Parameter p = (Parameter)vEffect.Variable;
if (p.IsOut)
{
return res;
}
}
string msg;
if (method.Equals(Method))
msg = string.Format("Cannot prove this statement does not modify {0} in declared pure method {1}", path, Method.Name);
else
msg = string.Format("Cannot prove this statement does not (indirectly) modify {0} in declared pure method {1}", path, Method.Name);
// Constructor are allowed to modify the "this" parameter
if (!isConstructor(Method) || !v.Equals(Method.ThisParameter))
{
res = new Pair<Statement, string>(stat, msg);
}
string statementString = stat.SourceContext.SourceText;
if (stat.SourceContext.SourceText == null)
{
statementString = CodePrinter.StatementToString(stat);
}
//Console.Out.WriteLine("({0},{1}) {2} {3}. Statement:{4}",
// stat.SourceContext.StartLine,
// stat.SourceContext.StartColumn,
// method.Equals(Method) ? "modifies" : "is modified in this call",
// path,
// statementString);
}
return res;
}
