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.HasLocalValue(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.UpdateLocal(local, item);
yield return(copy);
}
}
}
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.HasLocalValue(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.UpdateLocal(local, item);
yield return copy;
}
}
}
