private static IEnumerable <ProofState> UpdateLocalValue(UpdateStmt us, ProofState state)
{
Contract.Requires <ArgumentNullException>(us != null, "stmt");
Contract.Requires <ArgumentNullException>(state != null, "state");
Contract.Requires <ArgumentException>(state.IsLocalAssignment(us), "stmt");
foreach (var item in us.Rhss)
{
int index = us.Rhss.IndexOf(item);
Contract.Assert(us.Lhss.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
if (exprRhs?.Expr is ApplySuffix)
{
var aps = (ApplySuffix)exprRhs.Expr;
var result = SimpExpr.UnfoldTacticProjection(state, aps);
state.UpdateTacticVar(((NameSegment)us.Lhss[index]).Name, result);
}
else if (exprRhs?.Expr is Microsoft.Dafny.LiteralExpr)
{
state.UpdateTacticVar(((NameSegment)us.Lhss[index]).Name, (Microsoft.Dafny.LiteralExpr)exprRhs?.Expr);
}
else
{
throw new NotSupportedException("Not supported update statement");
}
}
yield return(state.Copy());
}
/// <summary>
/// Insert the statement as is into the state
/// </summary>
/// <param name="stmt"></param>
/// <param name="state"></param>
/// <returns></returns>
private static IEnumerable <ProofState> DefaultAction(Statement stmt, ProofState state)
{
Contract.Requires <ArgumentNullException>(stmt != null, "stmt");
Contract.Requires <ArgumentNullException>(state != null, "state");
state.AddStatement(stmt);
yield return(state.Copy());
}
private void UndfoldTacticCall(Statement stmt, ApplySuffix aps, Dictionary <IVariable, Type> varList)
{
// this is a top level tactic call
if (IfEvalTac)
{
_branches.Add(
TacnyInterpreter.EvalTopLevelTactic(_state.Copy(), varList, stmt, aps, _errorReporterDelegate,
_state.TargetMethod.CallsTactic != _tacticCalls + 1));
_tacticCalls++;
}
}
public static IEnumerable <ProofState> EvalPredicateStmt(PredicateStmt predicate, ProofState state)
{
Contract.Requires <ArgumentNullException>(predicate != null, "predicate");
var newPredicate = SimpExpr.SimpTacticExpr(state, predicate);
var copy = state.Copy();
copy.AddStatement(newPredicate);
copy.NeedVerify = true;
yield return(copy);
}