private void PrintModifyStmt(int indent, ModifyStmt s, bool omitFrame) {
Contract.Requires(0 <= indent);
Contract.Requires(s != null);
Contract.Requires(!omitFrame || s.Mod.Expressions.Count == 0);
wr.Write("modify");
PrintAttributes(s.Mod.Attributes);
wr.Write(" ");
if (omitFrame) {
wr.Write("...");
} else {
PrintFrameExpressionList(s.Mod.Expressions);
}
if (s.Body != null) {
// There's a possible syntactic ambiguity, namely if the frame is empty (more precisely,
// if s.Mod.Expressions.Count is 0). Since the statement was parsed at some point, this
// situation can occur only if the modify statement inherited its frame by refinement
// and we're printing the post-resolve AST. In this special case, print an explicit
// empty set as the frame.
if (s.Mod.Expressions.Count == 0) {
wr.Write(" {}");
}
wr.Write(" ");
PrintStatement(s.Body, indent);
} else {
wr.Write(";");
}
}
void ModifyStmt(out Statement s)
{
IToken tok; IToken endTok = Token.NoToken;
Attributes attrs = null;
FrameExpression fe; var mod = new List<FrameExpression>();
BlockStmt body = null; IToken bodyStart;
IToken ellipsisToken = null;
Expect(105);
tok = t;
while (IsAttribute()) {
Attribute(ref attrs);
}
if (StartOf(18)) {
FrameExpression(out fe, false, true);
mod.Add(fe);
while (la.kind == 22) {
Get();
FrameExpression(out fe, false, true);
mod.Add(fe);
}
} else if (la.kind == 59) {
Get();
ellipsisToken = t;
} else SynErr(193);
if (la.kind == 46) {
BlockStmt(out body, out bodyStart, out endTok);
} else if (la.kind == 28) {
while (!(la.kind == 0 || la.kind == 28)) {SynErr(194); Get();}
Get();
endTok = t;
} else SynErr(195);
s = new ModifyStmt(tok, endTok, mod, attrs, body);
if (ellipsisToken != null) {
s = new SkeletonStatement(s, ellipsisToken, null);
}
}
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;
}