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using System;
using System.Collections.Generic;
using System.Numerics;
using System.Diagnostics.Contracts;
using IToken = Microsoft.Boogie.IToken;
namespace Microsoft.Dafny
{
class Cloner
{
public ModuleDefinition CloneModuleDefinition(ModuleDefinition m, string name) {
ModuleDefinition nw;
if (m is DefaultModuleDecl) {
nw = new DefaultModuleDecl();
} else {
nw = new ModuleDefinition(Tok(m.tok), name, m.IsAbstract, m.IsFacade, m.RefinementBaseName, CloneAttributes(m.Attributes), true);
}
foreach (var d in m.TopLevelDecls) {
nw.TopLevelDecls.Add(CloneDeclaration(d, nw));
}
nw.RefinementBase = m.RefinementBase;
nw.Height = m.Height;
return nw;
}
public TopLevelDecl CloneDeclaration(TopLevelDecl d, ModuleDefinition m) {
Contract.Requires(d != null);
Contract.Requires(m != null);
if (d is ArbitraryTypeDecl) {
var dd = (ArbitraryTypeDecl)d;
return new ArbitraryTypeDecl(Tok(dd.tok), dd.Name, m, dd.EqualitySupport, CloneAttributes(dd.Attributes));
} else if (d is IndDatatypeDecl) {
var dd = (IndDatatypeDecl)d;
var tps = dd.TypeArgs.ConvertAll(CloneTypeParam);
var ctors = dd.Ctors.ConvertAll(CloneCtor);
var dt = new IndDatatypeDecl(Tok(dd.tok), dd.Name, m, tps, ctors, CloneAttributes(dd.Attributes));
return dt;
} else if (d is CoDatatypeDecl) {
var dd = (CoDatatypeDecl)d;
var tps = dd.TypeArgs.ConvertAll(CloneTypeParam);
var ctors = dd.Ctors.ConvertAll(CloneCtor);
var dt = new CoDatatypeDecl(Tok(dd.tok), dd.Name, m, tps, ctors, CloneAttributes(dd.Attributes));
return dt;
} else if (d is IteratorDecl) {
var dd = (IteratorDecl)d;
var tps = dd.TypeArgs.ConvertAll(CloneTypeParam);
var ins = dd.Ins.ConvertAll(CloneFormal);
var outs = dd.Outs.ConvertAll(CloneFormal);
var reads = CloneSpecFrameExpr(dd.Reads);
var mod = CloneSpecFrameExpr(dd.Modifies);
var decr = CloneSpecExpr(dd.Decreases);
var req = dd.Requires.ConvertAll(CloneMayBeFreeExpr);
var yreq = dd.YieldRequires.ConvertAll(CloneMayBeFreeExpr);
var ens = dd.Ensures.ConvertAll(CloneMayBeFreeExpr);
var yens = dd.YieldEnsures.ConvertAll(CloneMayBeFreeExpr);
var body = CloneBlockStmt(dd.Body);
var iter = new IteratorDecl(Tok(dd.tok), dd.Name, dd.Module,
tps, ins, outs, reads, mod, decr,
req, ens, yreq, yens,
body, CloneAttributes(dd.Attributes), dd.SignatureIsOmitted);
return iter;
} else if (d is ClassDecl) {
if (d is DefaultClassDecl) {
var dd = (ClassDecl)d;
var tps = dd.TypeArgs.ConvertAll(CloneTypeParam);
var mm = dd.Members.ConvertAll(CloneMember);
var cl = new DefaultClassDecl(m, mm);
return cl;
} else {
var dd = (ClassDecl)d;
var tps = dd.TypeArgs.ConvertAll(CloneTypeParam);
var mm = dd.Members.ConvertAll(CloneMember);
var cl = new ClassDecl(Tok(dd.tok), dd.Name, m, tps, mm, CloneAttributes(dd.Attributes));
return cl;
}
} else if (d is ModuleDecl) {
if (d is LiteralModuleDecl) {
var l = new LiteralModuleDecl(((LiteralModuleDecl)d).ModuleDef, m);
l.Signature = ((ModuleDecl)d).Signature;
return l;
} else if (d is AliasModuleDecl) {
var a = (AliasModuleDecl)d;
var alias = new AliasModuleDecl(a.Path, a.tok, m, a.Opened);
alias.ModuleReference = a.ModuleReference;
alias.Signature = a.Signature;
return alias;
} else if (d is ModuleFacadeDecl) {
var a = (ModuleFacadeDecl)d;
var abs = new ModuleFacadeDecl(a.Path, a.tok, m, a.CompilePath, a.Opened);
abs.Signature = a.Signature;
abs.OriginalSignature = a.OriginalSignature;
return abs;
} else {
Contract.Assert(false); // unexpected declaration
return null; // to please compiler
}
} else {
Contract.Assert(false); // unexpected declaration
return null; // to please compiler
}
}
public DatatypeCtor CloneCtor(DatatypeCtor ct) {
return new DatatypeCtor(Tok(ct.tok), ct.Name, ct.Formals.ConvertAll(CloneFormal), CloneAttributes(ct.Attributes));
}
public TypeParameter CloneTypeParam(TypeParameter tp) {
return new TypeParameter(Tok(tp.tok), tp.Name, tp.EqualitySupport);
}
public MemberDecl CloneMember(MemberDecl member) {
if (member is Field) {
Contract.Assert(!(member is SpecialField)); // we don't expect a SpecialField to be cloned (or do we?)
var f = (Field)member;
return new Field(Tok(f.tok), f.Name, f.IsGhost, f.IsMutable, f.IsUserMutable, CloneType(f.Type), CloneAttributes(f.Attributes));
} else if (member is Function) {
var f = (Function)member;
return CloneFunction(f);
} else {
var m = (Method)member;
return CloneMethod(m);
}
}
public Type CloneType(Type t) {
if (t is BasicType) {
return t;
} else if (t is SetType) {
var tt = (SetType)t;
return new SetType(CloneType(tt.Arg));
} else if (t is SeqType) {
var tt = (SeqType)t;
return new SeqType(CloneType(tt.Arg));
} else if (t is MultiSetType) {
var tt = (MultiSetType)t;
return new MultiSetType(CloneType(tt.Arg));
} else if (t is MapType) {
var tt = (MapType)t;
return new MapType(CloneType(tt.Domain), CloneType(tt.Range));
} else if (t is UserDefinedType) {
var tt = (UserDefinedType)t;
return new UserDefinedType(Tok(tt.tok), tt.Name, tt.TypeArgs.ConvertAll(CloneType), tt.Path.ConvertAll(Tok));
} else if (t is InferredTypeProxy) {
return new InferredTypeProxy();
} else if (t is ParamTypeProxy) {
return new ParamTypeProxy(CloneTypeParam(((ParamTypeProxy)t).orig));
} else {
Contract.Assert(false); // unexpected type (e.g., no other type proxies are expected at this time)
return null; // to please compiler
}
}
public Formal CloneFormal(Formal formal) {
return new Formal(Tok(formal.tok), formal.Name, CloneType(formal.Type), formal.InParam, formal.IsGhost);
}
public BoundVar CloneBoundVar(BoundVar bv) {
return new BoundVar(Tok(bv.tok), bv.Name, CloneType(bv.Type));
}
public Specification<Expression> CloneSpecExpr(Specification<Expression> spec) {
var ee = spec.Expressions == null ? null : spec.Expressions.ConvertAll(CloneExpr);
return new Specification<Expression>(ee, CloneAttributes(spec.Attributes));
}
public Specification<FrameExpression> CloneSpecFrameExpr(Specification<FrameExpression> frame) {
var ee = frame.Expressions == null ? null : frame.Expressions.ConvertAll(CloneFrameExpr);
return new Specification<FrameExpression>(ee, CloneAttributes(frame.Attributes));
}
public FrameExpression CloneFrameExpr(FrameExpression frame) {
return new FrameExpression(Tok(frame.tok), CloneExpr(frame.E), frame.FieldName);
}
public Attributes CloneAttributes(Attributes attrs) {
if (attrs == null) {
return null;
} else {
return new Attributes(attrs.Name, attrs.Args.ConvertAll(CloneAttrArg), CloneAttributes(attrs.Prev));
}
}
public Attributes.Argument CloneAttrArg(Attributes.Argument aa) {
if (aa.E != null) {
return new Attributes.Argument(Tok(aa.Tok), CloneExpr(aa.E));
} else {
return new Attributes.Argument(Tok(aa.Tok), aa.S);
}
}
public MaybeFreeExpression CloneMayBeFreeExpr(MaybeFreeExpression expr) {
var mfe = new MaybeFreeExpression(CloneExpr(expr.E), expr.IsFree);
mfe.Attributes = CloneAttributes(expr.Attributes);
return mfe;
}
public virtual Expression CloneExpr(Expression expr) {
if (expr == null) {
return null;
} else if (expr is LiteralExpr) {
var e = (LiteralExpr)expr;
if (e.Value == null) {
return new LiteralExpr(Tok(e.tok));
} else if (e.Value is bool) {
return new LiteralExpr(Tok(e.tok), (bool)e.Value);
} else {
return new LiteralExpr(Tok(e.tok), (BigInteger)e.Value);
}
} else if (expr is ThisExpr) {
if (expr is ImplicitThisExpr) {
return new ImplicitThisExpr(Tok(expr.tok));
} else {
return new ThisExpr(Tok(expr.tok));
}
} else if (expr is IdentifierExpr) {
var e = (IdentifierExpr)expr;
return new IdentifierExpr(Tok(e.tok), e.Name);
} else if (expr is DatatypeValue) {
var e = (DatatypeValue)expr;
return new DatatypeValue(Tok(e.tok), e.DatatypeName, e.MemberName, e.Arguments.ConvertAll(CloneExpr));
} else if (expr is DisplayExpression) {
DisplayExpression e = (DisplayExpression)expr;
if (expr is SetDisplayExpr) {
return new SetDisplayExpr(Tok(e.tok), e.Elements.ConvertAll(CloneExpr));
} else if (expr is MultiSetDisplayExpr) {
return new MultiSetDisplayExpr(Tok(e.tok), e.Elements.ConvertAll(CloneExpr));
} else {
Contract.Assert(expr is SeqDisplayExpr);
return new SeqDisplayExpr(Tok(e.tok), e.Elements.ConvertAll(CloneExpr));
}
} else if (expr is MapDisplayExpr) {
MapDisplayExpr e = (MapDisplayExpr)expr;
List<ExpressionPair> pp = new List<ExpressionPair>();
foreach (ExpressionPair p in e.Elements) {
pp.Add(new ExpressionPair(CloneExpr(p.A), CloneExpr(p.B)));
}
return new MapDisplayExpr(Tok(expr.tok), pp);
} else if (expr is ExprDotName) {
var e = (ExprDotName)expr;
return new ExprDotName(Tok(e.tok), CloneExpr(e.Obj), e.SuffixName);
} else if (expr is FieldSelectExpr) {
var e = (FieldSelectExpr)expr;
return new FieldSelectExpr(Tok(e.tok), CloneExpr(e.Obj), e.FieldName);
} else if (expr is SeqSelectExpr) {
var e = (SeqSelectExpr)expr;
return new SeqSelectExpr(Tok(e.tok), e.SelectOne, CloneExpr(e.Seq), CloneExpr(e.E0), CloneExpr(e.E1));
} else if (expr is MultiSelectExpr) {
var e = (MultiSelectExpr)expr;
return new MultiSelectExpr(Tok(e.tok), CloneExpr(e.Array), e.Indices.ConvertAll(CloneExpr));
} else if (expr is SeqUpdateExpr) {
var e = (SeqUpdateExpr)expr;
return new SeqUpdateExpr(Tok(e.tok), CloneExpr(e.Seq), CloneExpr(e.Index), CloneExpr(e.Value));
} else if (expr is FunctionCallExpr) {
var e = (FunctionCallExpr)expr;
return new FunctionCallExpr(Tok(e.tok), e.Name, CloneExpr(e.Receiver), e.OpenParen == null ? null : Tok(e.OpenParen), e.Args.ConvertAll(CloneExpr));
} else if (expr is OldExpr) {
var e = (OldExpr)expr;
return new OldExpr(Tok(e.tok), CloneExpr(e.E));
} else if (expr is MultiSetFormingExpr) {
var e = (MultiSetFormingExpr)expr;
return new MultiSetFormingExpr(Tok(e.tok), CloneExpr(e.E));
} else if (expr is FreshExpr) {
var e = (FreshExpr)expr;
return new FreshExpr(Tok(e.tok), CloneExpr(e.E));
} else if (expr is UnaryExpr) {
var e = (UnaryExpr)expr;
return new UnaryExpr(Tok(e.tok), e.Op, CloneExpr(e.E));
} else if (expr is BinaryExpr) {
var e = (BinaryExpr)expr;
return new BinaryExpr(Tok(e.tok), e.Op, CloneExpr(e.E0), CloneExpr(e.E1));
} else if (expr is TernaryExpr) {
var e = (TernaryExpr)expr;
return new TernaryExpr(Tok(e.tok), e.Op, CloneExpr(e.E0), CloneExpr(e.E1), CloneExpr(e.E2));
} else if (expr is ChainingExpression) {
var e = (ChainingExpression)expr;
return CloneExpr(e.E); // just clone the desugaring, since it's already available
} else if (expr is LetExpr) {
var e = (LetExpr)expr;
return new LetExpr(Tok(e.tok), e.Vars.ConvertAll(CloneBoundVar), e.RHSs.ConvertAll(CloneExpr), CloneExpr(e.Body), e.Exact);
} else if (expr is NamedExpr) {
var e = (NamedExpr)expr;
return new NamedExpr(Tok(e.tok), e.Name, CloneExpr(e.Body));
} else if (expr is ComprehensionExpr) {
var e = (ComprehensionExpr)expr;
var tk = Tok(e.tok);
var bvs = e.BoundVars.ConvertAll(CloneBoundVar);
var range = CloneExpr(e.Range);
var term = CloneExpr(e.Term);
if (e is ForallExpr) {
return new ForallExpr(tk, bvs, range, term, CloneAttributes(e.Attributes));
} else if (e is ExistsExpr) {
return new ExistsExpr(tk, bvs, range, term, CloneAttributes(e.Attributes));
} else if (e is MapComprehension) {
return new MapComprehension(tk, bvs, range, term);
} else {
Contract.Assert(e is SetComprehension);
return new SetComprehension(tk, bvs, range, term);
}
} else if (expr is WildcardExpr) {
return new WildcardExpr(Tok(expr.tok));
} else if (expr is StmtExpr) {
var e = (StmtExpr)expr;
return new StmtExpr(Tok(e.tok), CloneStmt(e.S), CloneExpr(e.E));
} else if (expr is ITEExpr) {
var e = (ITEExpr)expr;
return new ITEExpr(Tok(e.tok), CloneExpr(e.Test), CloneExpr(e.Thn), CloneExpr(e.Els));
} else if (expr is ParensExpression) {
var e = (ParensExpression)expr;
return CloneExpr(e.E); // skip the parentheses in the clone
} else if (expr is IdentifierSequence) {
var e = (IdentifierSequence)expr;
var aa = e.Arguments == null ? null : e.Arguments.ConvertAll(CloneExpr);
return new IdentifierSequence(e.Tokens.ConvertAll(Tok), e.OpenParen == null ? null : Tok(e.OpenParen), aa);
} else if (expr is MatchExpr) {
var e = (MatchExpr)expr;
return new MatchExpr(Tok(e.tok), CloneExpr(e.Source),
e.Cases.ConvertAll(c => new MatchCaseExpr(Tok(c.tok), c.Id, c.Arguments.ConvertAll(CloneBoundVar), CloneExpr(c.Body))));
} else {
Contract.Assert(false); throw new cce.UnreachableException(); // unexpected expression
}
}
public AssignmentRhs CloneRHS(AssignmentRhs rhs) {
AssignmentRhs c;
if (rhs is ExprRhs) {
var r = (ExprRhs)rhs;
c = new ExprRhs(CloneExpr(r.Expr));
} else if (rhs is HavocRhs) {
c = new HavocRhs(Tok(rhs.Tok));
} else {
var r = (TypeRhs)rhs;
if (r.ArrayDimensions != null) {
c = new TypeRhs(Tok(r.Tok), CloneType(r.EType), r.ArrayDimensions.ConvertAll(CloneExpr));
} else if (r.Arguments == null) {
c = new TypeRhs(Tok(r.Tok), CloneType(r.EType));
} else {
c = new TypeRhs(Tok(r.Tok), CloneType(r.EType), r.OptionalNameComponent, CloneExpr(r.ReceiverArgumentForInitCall), r.Arguments.ConvertAll(CloneExpr));
}
}
c.Attributes = CloneAttributes(rhs.Attributes);
return c;
}
public BlockStmt CloneBlockStmt(BlockStmt stmt) {
if (stmt == null) {
return null;
} else {
return new BlockStmt(Tok(stmt.Tok), Tok(stmt.EndTok), stmt.Body.ConvertAll(CloneStmt));
}
}
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 PrintStmt) {
var s = (PrintStmt)stmt;
r = new PrintStmt(Tok(s.Tok), Tok(s.EndTok), s.Args.ConvertAll(CloneAttrArg));
} 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 VarDecl) {
var s = (VarDecl)stmt;
r = new VarDecl(Tok(s.Tok), Tok(s.EndTok), s.Name, CloneType(s.OptionalType), s.IsGhost);
} else if (stmt is CallStmt) {
var s = (CallStmt)stmt;
r = new CallStmt(Tok(s.Tok), Tok(s.EndTok), s.Lhs.ConvertAll(CloneExpr), CloneExpr(s.Receiver), s.MethodName, s.Args.ConvertAll(CloneExpr));
} 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), 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));
} 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));
} else if (stmt is CalcStmt) {
var s = (CalcStmt)stmt;
r = new CalcStmt(Tok(s.Tok), Tok(s.EndTok), CloneCalcOp(s.Op), s.Lines.ConvertAll(CloneExpr), s.Hints.ConvertAll(CloneBlockStmt), s.StepOps.ConvertAll(CloneCalcOp), CloneCalcOp(s.ResultOp));
} else if (stmt is MatchStmt) {
var s = (MatchStmt)stmt;
r = new MatchStmt(Tok(s.Tok), Tok(s.EndTok), CloneExpr(s.Source),
s.Cases.ConvertAll(c => new MatchCaseStmt(Tok(c.tok), c.Id, c.Arguments.ConvertAll(CloneBoundVar), c.Body.ConvertAll(CloneStmt))));
} 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));
} 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;
r = new VarDeclStmt(Tok(s.Tok), Tok(s.EndTok), s.Lhss.ConvertAll(c => (VarDecl)CloneStmt(c)), (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;
}
public CalcStmt.CalcOp CloneCalcOp(CalcStmt.CalcOp op) {
if (op is CalcStmt.BinaryCalcOp) {
return new CalcStmt.BinaryCalcOp(((CalcStmt.BinaryCalcOp) op).Op);
} else if (op is CalcStmt.TernaryCalcOp) {
return new CalcStmt.TernaryCalcOp(CloneExpr(((CalcStmt.TernaryCalcOp) op).Index));
} else {
Contract.Assert(false);
throw new cce.UnreachableException();
}
}
public void AddStmtLabels(Statement s, LList<Label> node) {
if (node != null) {
AddStmtLabels(s, node.Next);
if (node.Data.Name == null) {
// this indicates an implicit-target break statement that has been resolved; don't add it
} else {
s.Labels = new LList<Label>(new Label(Tok(node.Data.Tok), node.Data.Name), s.Labels);
}
}
}
public GuardedAlternative CloneGuardedAlternative(GuardedAlternative alt) {
return new GuardedAlternative(Tok(alt.Tok), CloneExpr(alt.Guard), alt.Body.ConvertAll(CloneStmt));
}
public Function CloneFunction(Function f, string newName = null) {
var tps = f.TypeArgs.ConvertAll(CloneTypeParam);
var formals = f.Formals.ConvertAll(CloneFormal);
var req = f.Req.ConvertAll(CloneExpr);
var reads = f.Reads.ConvertAll(CloneFrameExpr);
var decreases = CloneSpecExpr(f.Decreases);
var ens = f.Ens.ConvertAll(CloneExpr);
var body = CloneExpr(f.Body);
if (newName == null) {
newName = f.Name;
}
if (f is Predicate) {
return new Predicate(Tok(f.tok), newName, f.IsStatic, f.IsGhost, tps, f.OpenParen, formals,
req, reads, ens, decreases, body, Predicate.BodyOriginKind.OriginalOrInherited, CloneAttributes(f.Attributes), false);
} else if (f is CoPredicate) {
return new CoPredicate(Tok(f.tok), newName, f.IsStatic, tps, f.OpenParen, formals,
req, reads, ens, body, CloneAttributes(f.Attributes), false);
} else {
return new Function(Tok(f.tok), newName, f.IsStatic, f.IsGhost, tps, f.OpenParen, formals, CloneType(f.ResultType),
req, reads, ens, decreases, body, CloneAttributes(f.Attributes), false);
}
}
public Method CloneMethod(Method m) {
Contract.Requires(m != null);
var tps = m.TypeArgs.ConvertAll(CloneTypeParam);
var ins = m.Ins.ConvertAll(CloneFormal);
var req = m.Req.ConvertAll(CloneMayBeFreeExpr);
var mod = CloneSpecFrameExpr(m.Mod);
var decreases = CloneSpecExpr(m.Decreases);
var ens = m.Ens.ConvertAll(CloneMayBeFreeExpr);
var body = CloneBlockStmt(m.Body);
if (m is Constructor) {
return new Constructor(Tok(m.tok), m.Name, tps, ins,
req, mod, ens, decreases, body, CloneAttributes(m.Attributes), false);
} else if (m is CoMethod) {
return new CoMethod(Tok(m.tok), m.Name, m.IsStatic, tps, ins, m.Outs.ConvertAll(CloneFormal),
req, mod, ens, decreases, body, CloneAttributes(m.Attributes), false);
} else if (m is Lemma) {
return new Lemma(Tok(m.tok), m.Name, m.IsStatic, tps, ins, m.Outs.ConvertAll(CloneFormal),
req, mod, ens, decreases, body, CloneAttributes(m.Attributes), false);
} else {
return new Method(Tok(m.tok), m.Name, m.IsStatic, m.IsGhost, tps, ins, m.Outs.ConvertAll(CloneFormal),
req, mod, ens, decreases, body, CloneAttributes(m.Attributes), false);
}
}
public virtual IToken Tok(IToken tok) {
return tok;
}
}
/// <summary>
/// Subclass of Cloner that collects some common functionality between CoMethodPostconditionSubstituter and
/// CoMethodBodyCloner.
/// </summary>
abstract class CoCloner : Cloner
{
protected readonly Expression k;
readonly Resolver resolver;
readonly string suffix;
protected CoCloner(Expression k, Resolver resolver)
{
Contract.Requires(k != null);
Contract.Requires(resolver != null);
this.k = k;
this.resolver = resolver;
this.suffix = string.Format("#[{0}]", Printer.ExprToString(k));
}
protected void ReportAdditionalInformation(IToken tok, string s)
{
Contract.Requires(tok != null);
Contract.Requires(s != null);
resolver.ReportAdditionalInformation(tok, s + suffix, s.Length);
}
}
/// <summary>
/// The CoMethodPostconditionSubstituter clones the postcondition declared on a comethod, but replaces
/// the calls and equalities in "coConclusions" with corresponding prefix versions. The resulting
/// expression is then appropriate to be a postcondition of the comethod's corresponding prefix method.
/// It is assumed that the source expression has been resolved. Note, the "k" given to the constructor
/// is not cloned with each use; it is simply used as is.
/// </summary>
class CoMethodPostconditionSubstituter : CoCloner
{
readonly ISet<Expression> coConclusions;
public CoMethodPostconditionSubstituter(ISet<Expression> coConclusions, Expression k, Resolver resolver)
: base(k, resolver)
{
Contract.Requires(coConclusions != null);
Contract.Requires(k != null);
Contract.Requires(resolver != null);
this.coConclusions = coConclusions;
}
public override Expression CloneExpr(Expression expr) {
if (expr is ConcreteSyntaxExpression) {
var e = (ConcreteSyntaxExpression)expr;
return CloneExpr(e.Resolved);
} else if (expr is FunctionCallExpr) {
var e = (FunctionCallExpr)expr;
if (coConclusions.Contains(e)) {
var receiver = CloneExpr(e.Receiver);
var args = new List<Expression>();
args.Add(k);
foreach (var arg in e.Args) {
args.Add(CloneExpr(arg));
}
var fexp = new FunctionCallExpr(Tok(e.tok), e.Name + "#", receiver, e.OpenParen, args);
ReportAdditionalInformation(e.tok, e.Name);
return fexp;
}
} else if (expr is BinaryExpr) {
var e = (BinaryExpr)expr;
if ((e.ResolvedOp == BinaryExpr.ResolvedOpcode.EqCommon || e.ResolvedOp == BinaryExpr.ResolvedOpcode.NeqCommon) && coConclusions.Contains(e)) {
var op = e.ResolvedOp == BinaryExpr.ResolvedOpcode.EqCommon ? TernaryExpr.Opcode.PrefixEqOp : TernaryExpr.Opcode.PrefixNeqOp;
var A = CloneExpr(e.E0);
var B = CloneExpr(e.E1);
var teq = new TernaryExpr(Tok(e.tok), op, k, A, B);
var opString = op == TernaryExpr.Opcode.PrefixEqOp ? "==" : "!=";
ReportAdditionalInformation(e.tok, opString);
return teq;
}
}
return base.CloneExpr(expr);
}
}
/// <summary>
/// The task of the CoMethodBodyCloner is to fill in the implicit _k-1 arguments in corecursive comethod calls.
/// The source statement and the given "k" are assumed to have been resolved, and the resulting statement will also be resolved.
/// </summary>
class CoMethodBodyCloner : CoCloner
{
readonly CoMethod context;
public CoMethodBodyCloner(CoMethod context, Expression k, Resolver resolver)
: base(k, resolver)
{
Contract.Requires(context != null);
Contract.Requires(k != null);
Contract.Requires(resolver != null);
this.context = context;
}
public override Statement CloneStmt(Statement stmt) {
if (stmt is UpdateStmt) {
var s = (UpdateStmt)stmt;
if (s.ResolvedStatements.Count == 1 && s.ResolvedStatements[0] is CallStmt) {
var call = (CallStmt)s.ResolvedStatements[0];
var moduleCaller = context.EnclosingClass.Module;
var moduleCallee = call.Method.EnclosingClass.Module;
if (call.Method is CoMethod && moduleCaller == moduleCallee && moduleCaller.CallGraph.GetSCCRepresentative(context) == moduleCaller.CallGraph.GetSCCRepresentative(call.Method)) {
// we're looking at a recursive call to a comethod
var args = new List<Expression>();
args.Add(k);
foreach (var arg in call.Args) {
args.Add(CloneExpr(arg));
}
var rhs = new CallRhs(Tok(call.Tok), CloneExpr(call.Receiver), call.MethodName + "#", args);
var r = new UpdateStmt(Tok(s.Tok), Tok(s.EndTok), s.Lhss.ConvertAll(CloneExpr), new List<AssignmentRhs>() { rhs }, s.CanMutateKnownState);
// don't forget to add labels to the cloned statement
AddStmtLabels(r, stmt.Labels);
r.Attributes = CloneAttributes(stmt.Attributes);
ReportAdditionalInformation(call.Tok, call.MethodName);
return r;
}
}
} else if (stmt is CallStmt) {
var s = (CallStmt)stmt;
if (s.Method is CoMethod) {
var moduleCaller = context.EnclosingClass.Module;
var moduleCallee = s.Method.EnclosingClass.Module;
if (s.Method is CoMethod && moduleCaller == moduleCallee && moduleCaller.CallGraph.GetSCCRepresentative(context) == moduleCaller.CallGraph.GetSCCRepresentative(s.Method)) {
// we're looking at a recursive call to a comethod
var args = new List<Expression>();
args.Add(k);
foreach (var arg in s.Args) {
args.Add(CloneExpr(arg));
}
var r = new CallStmt(Tok(s.Tok), Tok(s.EndTok), s.Lhs.ConvertAll(CloneExpr), CloneExpr(s.Receiver), s.MethodName + "#", args);
// don't forget to add labels to the cloned statement
AddStmtLabels(r, stmt.Labels);
r.Attributes = CloneAttributes(stmt.Attributes);
ReportAdditionalInformation(s.Tok, s.MethodName);
return r;
}
}
}
return base.CloneStmt(stmt);
}
}
}
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