public override IEnumerable <ProofState> Generate(Statement statement, ProofState state)
{
var tvds = statement as TacticVarDeclStmt;
AssignSuchThatStmt suchThat = null;
if (tvds != null)
{
suchThat = tvds.Update as AssignSuchThatStmt;
}
else if (statement is AssignSuchThatStmt)
{
suchThat = (AssignSuchThatStmt)statement;
}
else
{
Contract.Assert(false, "Unexpected statement type");
}
Contract.Assert(suchThat != null, "Unexpected statement type");
BinaryExpr bexp = suchThat.Expr as BinaryExpr;
var locals = new List <string>();
if (tvds == null)
{
foreach (var item in suchThat.Lhss)
{
if (item is IdentifierExpr)
{
var id = (IdentifierExpr)item;
if (state.ContainTacnyVal(id.Name))
{
locals.Add(id.Name);
}
else
{
//TODO: error
}
}
}
}
else
{
locals = new List <string>(tvds.Locals.Select(x => x.Name).ToList());
}
// this will cause issues when multiple variables are used
// as the variables are updated one at a time
foreach (var local in locals)
{
foreach (var item in ResolveExpression(state, bexp, local))
{
var copy = state.Copy();
copy.UpdateTacnyVar(local, item);
yield return(copy);
}
}
}
private void InitArgs(ProofState ps, Statement st, out IVariable lv, out List <Expression> callArguments)
{
Contract.Requires(st != null);
Contract.Ensures(Contract.ValueAtReturn(out callArguments) != null);
lv = null;
callArguments = null;
TacticVarDeclStmt tvds;
UpdateStmt us;
TacnyBlockStmt tbs;
// tacny variables should be declared as tvar or tactic var
//if(st is VarDeclStmt)
// Contract.Assert(false, Error.MkErr(st, 13));
if ((tvds = st as TacticVarDeclStmt) != null)
{
lv = tvds.Locals[0];
callArguments = GetCallArguments(tvds.Update as UpdateStmt);
}
else if ((us = st as UpdateStmt) != null)
{
if (us.Lhss.Count == 0)
{
callArguments = GetCallArguments(us);
}
else
{
var ns = (NameSegment)us.Lhss[0];
if (ps.ContainTacnyVal(ns))
{
//TODO: need to doubel check this
lv = ps.GetTacnyVarValue(ns) as IVariable;
callArguments = GetCallArguments(us);
}
}
}
else if ((tbs = st as TacnyBlockStmt) != null)
{
var pe = tbs.Guard as ParensExpression;
callArguments = pe != null ? new List <Expression> {
pe.E
} : new List <Expression> {
tbs.Guard
};
}
}
private void InitArgs(ProofState ps, Statement st, out IVariable lv, out List<Expression> callArguments) {
Contract.Requires(st != null);
Contract.Ensures(Contract.ValueAtReturn(out callArguments) != null);
lv = null;
callArguments = null;
TacticVarDeclStmt tvds;
UpdateStmt us;
TacnyBlockStmt tbs;
// tacny variables should be declared as tvar or tactic var
//if(st is VarDeclStmt)
// Contract.Assert(false, Error.MkErr(st, 13));
if((tvds = st as TacticVarDeclStmt) != null) {
lv = tvds.Locals[0];
callArguments = GetCallArguments(tvds.Update as UpdateStmt);
} else if((us = st as UpdateStmt) != null) {
if(us.Lhss.Count == 0)
callArguments = GetCallArguments(us);
else {
var ns = (NameSegment)us.Lhss[0];
if(ps.ContainTacnyVal(ns)) {
//TODO: need to doubel check this
lv = ps.GetTacnyVarValue(ns) as IVariable;
callArguments = GetCallArguments(us);
}
}
} else if((tbs = st as TacnyBlockStmt) != null) {
var pe = tbs.Guard as ParensExpression;
callArguments = pe != null ? new List<Expression> { pe.E } : new List<Expression> { tbs.Guard };
}
}