private IEnumerable <Solution> SuchThat(Statement st, Solution solution)
{
TacticVarDeclStmt tvds = st as TacticVarDeclStmt;
// statement must be object level, thus include as is
if (tvds == null)
{
yield return(AddNewStatement(st, st));
yield break;
}
AssignSuchThatStmt suchThat = tvds.Update as AssignSuchThatStmt;
Contract.Assert(suchThat != null, Error.MkErr(st, 5, typeof(AssignSuchThatStmt), tvds.Update.GetType()));
BinaryExpr bexp = suchThat.Expr as BinaryExpr;
Contract.Assert(bexp != null, Error.MkErr(st, 5, typeof(BinaryExpr), suchThat.Expr.GetType()));
// this will cause issues when multiple variables are used
// as the variables are updated one at a time
foreach (var local in tvds.Locals)
{
foreach (var item in ResolveExpression(bexp, local))
{
yield return(AddNewLocal(local, item));
}
}
}
private static IEnumerable <ProofState> RegisterVariable(TacticVarDeclStmt declaration, ProofState state)
{
if (declaration.Update == null)
{
yield break;
}
var rhs = declaration.Update as UpdateStmt;
if (rhs == null)
{
// check if rhs is SuchThatStmt
if (declaration.Update is AssignSuchThatStmt)
{
foreach (var item in declaration.Locals)
{
state.AddLocal(item, null);
}
foreach (var item in EvaluateSuchThatStmt(declaration.Update as AssignSuchThatStmt, state))
{
yield return(item.Copy());
}
}
else
{
foreach (var item in declaration.Locals)
{
state.AddLocal(item, null);
}
}
}
else
{
foreach (var item in rhs.Rhss)
{
int index = rhs.Rhss.IndexOf(item);
Contract.Assert(declaration.Locals.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
if (exprRhs?.Expr is ApplySuffix)
{
var aps = (ApplySuffix)exprRhs.Expr;
foreach (var result in EvaluateTacnyExpression(state, aps))
{
state.AddLocal(declaration.Locals[index], result);
}
}
else if (exprRhs?.Expr is Dafny.LiteralExpr)
{
state.AddLocal(declaration.Locals[index], (Dafny.LiteralExpr)exprRhs?.Expr);
}
else
{
state.AddLocal(declaration.Locals[index], exprRhs?.Expr);
}
}
}
yield return(state.Copy());
}
public static IEnumerable <ProofState> RegisterVariable(TacticVarDeclStmt declaration, ProofState state)
{
var rhs = declaration.Update as UpdateStmt;
if (rhs != null)
{
foreach (var item in rhs.Rhss)
{
int index = rhs.Rhss.IndexOf(item);
Contract.Assert(declaration.Locals.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
var res = EvalExpr.EvalTacticExpression(state, exprRhs?.Expr);
if (res != null)
{
state.AddTacnyVar(declaration.Locals[index], res);
yield return(state);
}
}
}
else
{
var stmt = declaration.Update as AssignSuchThatStmt;
if (stmt != null)
{
foreach (var item in declaration.Locals)
{
state.AddTacnyVar(item, null);
}
foreach (var item in EvalSuchThatStmt(stmt, state))
{
yield return(item);
}
}
else
{
foreach (var item in declaration.Locals)
{
if (state.ContainTVal(item.Name))
{
state.ReportTacticError(item.Tok, item.Name + " has already been defined in the current scope.");
yield break;
}
else
{
state.AddTacnyVar(item, null);
}
}
yield return(state);
}
}
}
public virtual Statement CloneStmt(Statement stmt) {
if (stmt == null) {
return null;
}
Statement r;
if (stmt is AssertStmt) {
var s = (AssertStmt)stmt;
r = new AssertStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Expr), null);
} else if (stmt is AssumeStmt) {
var s = (AssumeStmt)stmt;
r = new AssumeStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Expr), null);
} else if (stmt is TacticInvariantStmt) {
var s = (TacticInvariantStmt)stmt;
r = new TacticInvariantStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Expr), null, s.IsObjectLevel);
} else if (stmt is TacticAssertStmt) {
var s = (TacticAssertStmt)stmt;
r = new TacticAssertStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Expr), null, s.IsObjectLevel);
} else if (stmt is PrintStmt) {
var s = (PrintStmt)stmt;
r = new PrintStmt(Tok(s.Tok), Tok(s.EndTok), s.Args.ConvertAll(CloneExpr));
} else if (stmt is BreakStmt) {
var s = (BreakStmt)stmt;
if (s.TargetLabel != null) {
r = new BreakStmt(Tok(s.Tok), Tok(s.EndTok), s.TargetLabel);
} else {
r = new BreakStmt(Tok(s.Tok), Tok(s.EndTok), s.BreakCount);
}
} else if (stmt is ReturnStmt) {
var s = (ReturnStmt)stmt;
r = new ReturnStmt(Tok(s.Tok), Tok(s.EndTok), s.rhss == null ? null : s.rhss.ConvertAll(CloneRHS));
} else if (stmt is YieldStmt) {
var s = (YieldStmt)stmt;
r = new YieldStmt(Tok(s.Tok), Tok(s.EndTok), s.rhss == null ? null : s.rhss.ConvertAll(CloneRHS));
} else if (stmt is AssignStmt) {
var s = (AssignStmt)stmt;
r = new AssignStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Lhs), CloneRHS(s.Rhs));
} else if (stmt is BlockStmt) {
r = CloneBlockStmt((BlockStmt)stmt);
} else if (stmt is IfStmt) {
var s = (IfStmt)stmt;
r = new IfStmt(Tok(s.Tok), Tok(s.EndTok), s.IsExistentialGuard, CloneExpr(s.Guard), CloneBlockStmt(s.Thn), CloneStmt(s.Els));
} else if (stmt is AlternativeStmt) {
var s = (AlternativeStmt)stmt;
r = new AlternativeStmt(Tok(s.Tok), Tok(s.EndTok), s.Alternatives.ConvertAll(CloneGuardedAlternative));
} else if (stmt is WhileStmt) {
var s = (WhileStmt)stmt;
r = new WhileStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Guard), s.Invariants.ConvertAll(CloneMayBeFreeExpr), CloneSpecExpr(s.Decreases), CloneSpecFrameExpr(s.Mod), CloneBlockStmt(s.Body));
((WhileStmt)r).TacAps = s.TacAps;
} else if (stmt is AlternativeLoopStmt) {
var s = (AlternativeLoopStmt)stmt;
r = new AlternativeLoopStmt(Tok(s.Tok), Tok(s.EndTok), s.Invariants.ConvertAll(CloneMayBeFreeExpr), CloneSpecExpr(s.Decreases), CloneSpecFrameExpr(s.Mod), s.Alternatives.ConvertAll(CloneGuardedAlternative));
} else if (stmt is ForallStmt) {
var s = (ForallStmt)stmt;
r = new ForallStmt(Tok(s.Tok), Tok(s.EndTok), s.BoundVars.ConvertAll(CloneBoundVar), null, CloneExpr(s.Range), s.Ens.ConvertAll(CloneMayBeFreeExpr), CloneStmt(s.Body));
if (s.ForallExpressions != null) {
((ForallStmt)r).ForallExpressions = s.ForallExpressions.ConvertAll(CloneExpr);
}
} else if (stmt is CalcStmt) {
var s = (CalcStmt)stmt;
// calc statements have the unusual property that the last line is duplicated. If that is the case (which
// we expect it to be here), we share the clone of that line as well.
var lineCount = s.Lines.Count;
var lines = new List<Expression>(lineCount);
for (int i = 0; i < lineCount; i++) {
lines.Add(i == lineCount - 1 && 2 <= lineCount && s.Lines[i] == s.Lines[i - 1] ? lines[i - 1] : CloneExpr(s.Lines[i]));
}
Contract.Assert(lines.Count == lineCount);
r = new CalcStmt(Tok(s.Tok), Tok(s.EndTok), CloneCalcOp(s.Op), lines, s.Hints.ConvertAll(CloneBlockStmt), s.StepOps.ConvertAll(CloneCalcOp), CloneCalcOp(s.ResultOp), CloneAttributes(s.Attributes));
} else if (stmt is MatchStmt) {
var s = (MatchStmt)stmt;
r = new MatchStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Source),
s.Cases.ConvertAll(CloneMatchCaseStmt), s.UsesOptionalBraces);
} else if (stmt is AssignSuchThatStmt) {
var s = (AssignSuchThatStmt)stmt;
r = new AssignSuchThatStmt(Tok(s.Tok), Tok(s.EndTok), s.Lhss.ConvertAll(CloneExpr), CloneExpr(s.Expr), s.AssumeToken == null ? null : Tok(s.AssumeToken), null);
} else if (stmt is UpdateStmt) {
var s = (UpdateStmt)stmt;
r = new UpdateStmt(Tok(s.Tok), Tok(s.EndTok), s.Lhss.ConvertAll(CloneExpr), s.Rhss.ConvertAll(CloneRHS), s.CanMutateKnownState);
} else if (stmt is VarDeclStmt) {
var s = (VarDeclStmt)stmt;
var lhss = s.Locals.ConvertAll(c => new LocalVariable(Tok(c.Tok), Tok(c.EndTok), c.Name, CloneType(c.OptionalType), c.IsGhost));
r = new VarDeclStmt(Tok(s.Tok), Tok(s.EndTok), lhss, (ConcreteUpdateStatement)CloneStmt(s.Update));
} else if (stmt is LetStmt) {
var s = (LetStmt)stmt;
r = new LetStmt(Tok(s.Tok), Tok(s.EndTok), s.LHSs.ConvertAll(CloneCasePattern), s.RHSs.ConvertAll(CloneExpr));
} else if (stmt is ModifyStmt) {
var s = (ModifyStmt)stmt;
var mod = CloneSpecFrameExpr(s.Mod);
var body = s.Body == null ? null : CloneBlockStmt(s.Body);
r = new ModifyStmt(Tok(s.Tok), Tok(s.EndTok), mod.Expressions, mod.Attributes, body);
} else if (stmt is TacnyCasesBlockStmt) {
var s = (TacnyCasesBlockStmt)stmt;
var guard = CloneExpr(s.Guard);
var body = s.Body == null ? null : CloneBlockStmt(s.Body);
r = new TacnyCasesBlockStmt(Tok(s.Tok), Tok(s.EndTok), guard, body);
} else if (stmt is TacnyChangedBlockStmt) {
var s = (TacnyChangedBlockStmt)stmt;
var body = s.Body == null ? null : CloneBlockStmt(s.Body);
r = new TacnyChangedBlockStmt(Tok(s.Tok), Tok(s.EndTok), body);
} else if (stmt is TacnySolvedBlockStmt) {
var s = (TacnySolvedBlockStmt)stmt;
var body = s.Body == null ? null : CloneBlockStmt(s.Body);
r = new TacnySolvedBlockStmt(Tok(s.Tok), Tok(s.EndTok), body);
} else if (stmt is TacnyTryCatchBlockStmt) {
var s = (TacnyTryCatchBlockStmt)stmt;
var body = s.Body == null ? null : CloneBlockStmt(s.Body);
var c = s.Ctch == null ? null : CloneBlockStmt(s.Ctch);
r = new TacnyTryCatchBlockStmt(Tok(s.Tok), Tok(s.EndTok), body, c);
} else if (stmt is TacticVarDeclStmt) {
var s = (TacticVarDeclStmt)stmt;
var lhss = s.Locals.ConvertAll(c => new LocalVariable(Tok(c.Tok), Tok(c.EndTok), c.Name, CloneType(c.OptionalType), c.IsGhost));
r = new TacticVarDeclStmt(Tok(s.Tok), Tok(s.EndTok), lhss, (ConcreteUpdateStatement)CloneStmt(s.Update));
} else {
Contract.Assert(false); throw new cce.UnreachableException(); // unexpected statement
}
// add labels to the cloned statement
AddStmtLabels(r, stmt.Labels);
r.Attributes = CloneAttributes(stmt.Attributes);
return r;
}
private static IEnumerable<ProofState> RegisterVariable(TacticVarDeclStmt declaration, ProofState state) {
if (declaration.Update == null) yield break;
var rhs = declaration.Update as UpdateStmt;
if (rhs == null) {
// check if rhs is SuchThatStmt
if (declaration.Update is AssignSuchThatStmt) {
foreach (var item in declaration.Locals)
state.AddLocal(item, null);
foreach (var item in EvaluateSuchThatStmt(declaration.Update as AssignSuchThatStmt, state)) {
yield return item.Copy();
}
} else {
foreach (var item in declaration.Locals)
state.AddLocal(item, null);
}
} else {
foreach (var item in rhs.Rhss) {
int index = rhs.Rhss.IndexOf(item);
Contract.Assert(declaration.Locals.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
if (exprRhs?.Expr is ApplySuffix) {
var aps = (ApplySuffix)exprRhs.Expr;
foreach (var result in EvaluateTacnyExpression(state, aps)) {
state.AddLocal(declaration.Locals[index], result);
}
} else if (exprRhs?.Expr is Dafny.LiteralExpr) {
state.AddLocal(declaration.Locals[index], (Dafny.LiteralExpr)exprRhs?.Expr);
} else {
state.AddLocal(declaration.Locals[index], exprRhs?.Expr);
}
}
}
yield return state.Copy();
}
void TacticVarDeclStmt(out Statement/*!*/ s, IToken x) {
IToken assignTok = null;
bool isGhost = false;
LocalVariable d;
AssignmentRhs r;
List<LocalVariable> lhss = new List<LocalVariable>();
List<AssignmentRhs> rhss = new List<AssignmentRhs>();
IToken suchThatAssume = null;
Expression suchThat = null;
Attributes attrs = null;
IToken endTok;
Expression or = null;
while (la.kind == 46) {
Attribute(ref attrs);
}
LocalIdentTypeOptional(out d, isGhost);
lhss.Add(d); d.Attributes = attrs; attrs = null;
while (la.kind == 22) {
Get();
while (la.kind == 46) {
Attribute(ref attrs);
}
LocalIdentTypeOptional(out d, isGhost);
lhss.Add(d); d.Attributes = attrs; attrs = null;
}
if (la.kind == 25 || la.kind == 46 || la.kind == 104) {
if (la.kind == 104) {
Get();
assignTok = t;
Rhs(out r);
rhss.Add(r);
while (la.kind == 22) {
Get();
Rhs(out r);
rhss.Add(r);
}
if (la.kind == 105) {
Get();
x = t;
Expression(out or, false, true);
}
} else {
while (la.kind == 46) {
Attribute(ref attrs);
}
Expect(25);
assignTok = t;
if (la.kind == _assume) {
Expect(31);
suchThatAssume = t;
}
Expression(out suchThat, false, true);
}
}
while (!(la.kind == 0 || la.kind == 28)) {SynErr(216); Get();}
Expect(28);
endTok = t;
ConcreteUpdateStatement update;
if (suchThat != null) {
var ies = new List<Expression>();
foreach (var lhs in lhss) {
ies.Add(new IdentifierExpr(lhs.Tok, lhs.Name));
}
update = new AssignSuchThatStmt(assignTok, endTok, ies, suchThat, suchThatAssume, attrs);
} else if (rhss.Count == 0) {
update = null;
} else {
var ies = new List<Expression>();
foreach (var lhs in lhss) {
ies.Add(new AutoGhostIdentifierExpr(lhs.Tok, lhs.Name));
}
update = new UpdateStmt(assignTok, endTok, ies, rhss);
}
s = new TacticVarDeclStmt(x, endTok, lhss, update);
}
public static IEnumerable<ProofState> RegisterVariable(TacticVarDeclStmt declaration, ProofState state) {
if(declaration.Update == null)
yield break;
var rhs = declaration.Update as UpdateStmt;
if(rhs == null) {
// check if rhs is SuchThatStmt
if(declaration.Update is AssignSuchThatStmt) {
foreach(var item in declaration.Locals)
state.AddTacnyVar(item, null);
foreach(var item in EvalSuchThatStmt(declaration.Update as AssignSuchThatStmt, state)) {
yield return item.Copy();
}
} else {
foreach(var item in declaration.Locals)
state.AddTacnyVar(item, null);
}
} else {
foreach(var item in rhs.Rhss) {
int index = rhs.Rhss.IndexOf(item);
Contract.Assert(declaration.Locals.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
if(exprRhs?.Expr is ApplySuffix) {
var aps = (ApplySuffix)exprRhs.Expr;
foreach(var result in EvalTacnyExpression(state, aps)) {
state.AddTacnyVar(declaration.Locals[index], result);
}
} else if(exprRhs?.Expr is Dafny.LiteralExpr) {
state.AddTacnyVar(declaration.Locals[index], (Dafny.LiteralExpr)exprRhs?.Expr);
} else if(exprRhs?.Expr is Dafny.NameSegment) {
var name = ((Dafny.NameSegment)exprRhs.Expr).Name;
if(state.ContainTacnyVal(name))
// in the case that referring to an exisiting tvar, dereference it
state.AddTacnyVar(declaration.Locals[index], state.GetTacnyVarValue(name));
} else {
state.AddTacnyVar(declaration.Locals[index], exprRhs?.Expr);
}
}
}
yield return state.Copy();
}
public static IEnumerable <ProofState> RegisterVariable(TacticVarDeclStmt declaration, ProofState state)
{
if (declaration.Update == null)
{
yield break;
}
var rhs = declaration.Update as UpdateStmt;
if (rhs == null)
{
// check if rhs is SuchThatStmt
if (declaration.Update is AssignSuchThatStmt)
{
foreach (var item in declaration.Locals)
{
state.AddTacnyVar(item, null);
}
foreach (var item in EvalSuchThatStmt(declaration.Update as AssignSuchThatStmt, state))
{
yield return(item.Copy());
}
}
else
{
foreach (var item in declaration.Locals)
{
state.AddTacnyVar(item, null);
}
}
}
else
{
foreach (var item in rhs.Rhss)
{
int index = rhs.Rhss.IndexOf(item);
Contract.Assert(declaration.Locals.ElementAtOrDefault(index) != null, "register var err");
var exprRhs = item as ExprRhs;
if (exprRhs?.Expr is ApplySuffix)
{
var aps = (ApplySuffix)exprRhs.Expr;
foreach (var result in EvalTacnyExpression(state, aps))
{
state.AddTacnyVar(declaration.Locals[index], result);
}
}
else if (exprRhs?.Expr is Dafny.LiteralExpr)
{
state.AddTacnyVar(declaration.Locals[index], (Dafny.LiteralExpr)exprRhs?.Expr);
}
else if (exprRhs?.Expr is Dafny.NameSegment)
{
var name = ((Dafny.NameSegment)exprRhs.Expr).Name;
if (state.ContainTacnyVal(name))
{
// in the case that referring to an exisiting tvar, dereference it
state.AddTacnyVar(declaration.Locals[index], state.GetTacnyVarValue(name));
}
}
else
{
state.AddTacnyVar(declaration.Locals[index], exprRhs?.Expr);
}
}
}
yield return(state.Copy());
}