public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
Contract.Assert(ExtractGuard(st) != null, Error.MkErr(st, 2));
/**
* Check if the loop guard can be resolved localy
*/
return IsResolvable() ? ExecuteLoop(st as WhileStmt) : InsertLoop(st as WhileStmt);
}
public IEnumerable<Solution> AddInvar(TacticInvariantStmt st, Solution solution) {
MaybeFreeExpression invariant = null;
foreach (var item in ResolveExpression(st.Expr)) {
if (item is UpdateStmt) {
var us = item as UpdateStmt;
var aps = ((ExprRhs)us.Rhss[0]).Expr as ApplySuffix;
if (aps != null)
invariant = new MaybeFreeExpression(aps);
} else {
invariant = item as MaybeFreeExpression ?? new MaybeFreeExpression(item as Expression);
}
WhileStmt nws = null;
var ws = DynamicContext.whileStmt;
Contract.Assert(ws != null, Error.MkErr(st, 11));
// if we already added new invariants to the statement, use the updated statement instead
nws = GetUpdated(ws) as WhileStmt;
var invarArr = nws?.Invariants.ToArray() ?? ws.Invariants.ToArray();
var invar = new List<MaybeFreeExpression>(invarArr) {invariant};
//invar.Insert(0, invariant);
nws = new WhileStmt(ws.Tok, ws.EndTok, ws.Guard, invar, ws.Decreases, ws.Mod, ws.Body);
yield return AddNewStatement(ws, nws);
}
}
/// <summary>
/// Merge two lists together
/// </summary>
/// <param name="st"></param>
/// <param name="solution_list"></param>
/// <returns></returns>
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
IVariable lv = null;
List<Expression> call_arguments;
IList result = null;
InitArgs(st, out lv, out call_arguments);
Contract.Assert(lv != null, Error.MkErr(st, 8));
Contract.Assert(tcce.OfSize(call_arguments, 2), Error.MkErr(st, 0, 2, call_arguments.Count));
foreach (var arg1 in ResolveExpression(call_arguments[0])) {
foreach (var arg2 in ResolveExpression(call_arguments[1])) {
// valdiate the argument types
Type type1 = arg1.GetType().GetGenericArguments().Single();
Type type2 = arg2.GetType().GetGenericArguments().Single();
Contract.Assert(type1.Equals(type2), Error.MkErr(st, 1, type1));
if (!(arg1 is IEnumerable) || !(arg2 is IEnumerable))
Contract.Assert(false, Error.MkErr(st, 1, typeof(IEnumerable)));
dynamic darg1 = arg1;
dynamic darg2 = arg2;
result = MergeLists(darg1, darg2, type1);
yield return AddNewLocal(lv, result);
}
}
}
/// <summary>
/// Identity expression
/// </summary>
/// <param name="st"></param>
/// <param name="solution"></param>
/// <returns></returns>
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
List<Expression> args = null;
IVariable lv = null;
InitArgs(st, out lv, out args);
LiteralExpr lit = new LiteralExpr(st.Tok, true);
var ac = Copy();
ac.DynamicContext.AddLocal(lv, lit);
yield return new Solution(ac);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
var temp = st as TacticInvariantStmt;
if(temp != null && temp.IsObjectLevel) {
return AddInvar(temp, solution);
}
throw new NotImplementedException();
}
private Solution Params(Statement st, Solution solution) {
IVariable lv = null;
List<Expression> call_arguments; // we don't care about this
List<IVariable> input = new List<IVariable>();
InitArgs(st, out lv, out call_arguments);
Contract.Assert(lv != null, Error.MkErr(st, 8));
Contract.Assert(tcce.OfSize(call_arguments, 0), Error.MkErr(st, 0, 0, call_arguments.Count));
Method source = DynamicContext.md as Method;
Contract.Assert(source != null, Error.MkErr(st, 4));
input.AddRange(source.Ins);
//input.AddRange(source.Outs);
AddLocal(lv, input);
return new Solution(Copy());
}
private Solution GetVariables(Statement st, Solution solution) {
IVariable lv = null;
List<Expression> call_arguments;
List<IVariable> locals = new List<IVariable>();
InitArgs(st, out lv, out call_arguments);
Contract.Assert(lv != null, Error.MkErr(st, 8));
Contract.Assert(tcce.OfSize(call_arguments, 0), Error.MkErr(st, 0, 0, call_arguments.Count));
Method source = DynamicContext.md as Method;
Contract.Assert(source != null, Error.MkErr(st, 4));
locals.AddRange(StaticContext.staticVariables.Values.ToList());
AddLocal(lv, locals);
return new Solution(Copy());
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
IVariable lv = null;
List<Expression> callArgs = null;
InitArgs(st, out lv, out callArgs);
Contract.Assert(tcce.OfSize(callArgs, 2), Error.MkErr(st, 0, 2, callArgs.Count));
foreach (var ns in ResolveExpression(callArgs[0])) {
var toRemove = ns as NameSegment;
foreach (var list in ResolveExpression(callArgs[1])) {
var source = list as List<IVariable>;
var target = source.FirstOrDefault(x => x.Name == toRemove.Name);
if (target != null)
source.Remove(target);
yield return AddNewLocal(lv, source);
}
}
}
private IEnumerable<Solution> FreshName(Statement st, Solution solution) {
IVariable lv = null;
List<Expression> callArguments = null;
InitArgs(st, out lv, out callArguments);
Contract.Assert(tcce.OfSize(callArguments, 1), Error.MkErr(st, 0, 1, callArguments.Count));
var nameLiteralExpr = callArguments[0] as StringLiteralExpr;
Contract.Assert(nameLiteralExpr != null, Error.MkErr(st, 1, "string"));
var count = StaticContext.program.Members.Keys.Count(x => x == nameLiteralExpr.AsStringLiteral());
if (count == 0) {
yield return AddNewLocal(lv, Util.Copy.CopyStringLiteralExpr(nameLiteralExpr));
} else {
var nameValue = nameLiteralExpr.AsStringLiteral();
var freshNameValue = string.Format("{0}{1}{2}", nameValue, SUFFIX, count);
yield return AddNewLocal(lv, new StringLiteralExpr(nameLiteralExpr.tok, freshNameValue, nameLiteralExpr.IsVerbatim));
}
}
private Solution GetMember(Statement st, Solution solution) {
IVariable lv = null;
List<Expression> call_arguments;
InitArgs(st, out lv, out call_arguments);
Contract.Assert(lv != null, Error.MkErr(st, 8));
Contract.Assert(call_arguments.Count <= 1, Error.MkErr(st, 0, 1, call_arguments.Count));
MemberDecl memberDecl = null;
if (call_arguments.Count == 1) {
var memberName = call_arguments[0] as StringLiteralExpr;
try {
memberDecl = StaticContext.program.Members[memberName.AsStringLiteral()];
} catch (KeyNotFoundException e) {
Console.Out.WriteLine(e.Message);
Contract.Assert(false, Error.MkErr(st, 20, memberName.AsStringLiteral()));
}
} else {
memberDecl = StaticContext.md;
}
return AddNewLocal(lv, memberDecl);
}
private Solution Precond(Statement st, Solution solution) {
IVariable lv = null;
List<Expression> call_arguments; // we don't care about this
List<Expression> requirements = new List<Expression>();
InitArgs(st, out lv, out call_arguments);
Contract.Assert(lv != null, Error.MkErr(st, 8));
Contract.Assert(call_arguments.Count <= 1, Error.MkErr(st, 0, 0, call_arguments.Count));
MemberDecl memberDecl = null;
if (call_arguments.Count > 0) {
foreach (var member in ResolveExpression(call_arguments[0])) {
memberDecl = member as MemberDecl;
if (memberDecl == null)
Contract.Assert(false, Error.MkErr(st, 1, "Function, [Ghost] Method, Declaration"));
break;
}
} else {
memberDecl = StaticContext.md;
}
Function fun = memberDecl as Function;
if (fun != null) {
foreach (var req in fun.Req)
requirements.Add(Util.Copy.CopyExpression(req));
} else {
Method method = memberDecl as Method;
if (method != null) {
foreach (var req in method.Req)
requirements.Add(Util.Copy.CopyExpression(req.E));
} else {
Contract.Assert(false, Error.MkErr(st, 1, "Function, [Ghost] Method, Declaration"));
}
}
var ac = Copy();
ac.AddLocal(lv, requirements);
return new Solution(ac);
}
private IEnumerable<Solution> ResolveBexp(Statement st, Solution solution) {
// unwarp binary expr
var updateStmt = st as UpdateStmt;
Contract.Assert(updateStmt != null, "updateStmt == null");
var aps = ((ExprRhs)updateStmt?.Rhss[0])?.Expr as ApplySuffix;
var bexp = aps?.Lhs as TacnyBinaryExpr;
if (bexp == null)
Contract.Assert(false);
Contract.Assert(bexp != null, "updateStmt == null");
switch (bexp.Op) {
case TacnyBinaryExpr.TacnyOpcode.TacnyOr:
foreach (var result in ResolveExpression(bexp.E0)) {
var ac = Copy();
if (result is Expression)
ac.DynamicContext.generatedExpressions.Add(result as Expression);
else if (result is IVariable)
ac.DynamicContext.generatedExpressions.Add(VariableToExpression(result as IVariable));
else
Contract.Assert(false, "Sum tin wong");
yield return new Solution(ac);
}
foreach (var result in ResolveExpression(bexp.E1)) {
var ac = Copy();
if (result is Expression)
ac.DynamicContext.generatedExpressions.Add(result as Expression);
else if (result is IVariable)
ac.DynamicContext.generatedExpressions.Add(VariableToExpression(result as IVariable));
else
Contract.Assert(false, "Sum tin wong");
yield return new Solution(ac);
}
yield break;
default:
Contract.Assert(false); // unknown operator
yield break;
}
}
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);
}
}
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
List<Expression> call_arguments = null;
IVariable lv = null;
DatatypeDecl datatype = null;
InitArgs(st, out lv, out call_arguments);
Contract.Assert(tcce.OfSize(call_arguments, 1), Error.MkErr(st, 0, 1, call_arguments.Count));
string argType = GetArgumentType(call_arguments[0] as NameSegment);
foreach (var result in ResolveExpression(call_arguments[0])) {
if (argType == "Element") {
var ns = result as NameSegment;
IVariable originalDecl = StaticContext.GetGlobalVariable(ns.Name);
Contract.Assert(originalDecl != null, Error.MkErr(st, 9, ((NameSegment)call_arguments[0]).Name));
var datatypeName = originalDecl.Type.ToString();
datatype = StaticContext.GetGlobal(datatypeName);
var lit = IsInductive(datatypeName, datatype);
yield return AddNewLocal(lv, lit);
} else {
var ctor = result as DatatypeCtor;
Contract.Assert(ctor != null, Error.MkErr(st, 1, "Datatype constructor"));
var datatypeName = ctor.EnclosingDatatype.Name;
LiteralExpr lit = new LiteralExpr(st.Tok, false);
foreach (var formal in ctor.Formals) {
if (formal.Type.ToString() == datatypeName) {
lit = new LiteralExpr(st.Tok, true);
break;
}
}
yield return AddNewLocal(lv, lit);
}
}
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
yield return Lemmas(st);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
return FreshName(st, solution);
}
public Solution(Atomic state, Solution parent = null)
: this(state, false, parent) { }
public Solution(Atomic state, bool isFinal, Solution parent) {
State = state;
IsFinal = isFinal;
Parent = parent;
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
yield return (GenerateExpression(st));
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
yield return GetVariables(st, solution);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
yield return (GetConstructor(st));
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
return GetPredicates(st);
}
internal static bool VerifySolution(Solution solution) {
if (!solution.State.StaticContext.program.HasError()) {
// return the valid solution and terminate
return true;
} // if verifies break else continue to the next solution
if (solution.State.ResolveAndVerify(solution)) {
return !solution.State.StaticContext.program.HasError();
}
return false;
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
yield return Postcond(st);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
return ResolveBexp(st, solution);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
return ReplaceOperator(st);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
yield return Params(st, solution);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
return ReplaceConstant(st);
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
throw new NotImplementedException();
}
public IEnumerable<Solution> Resolve(Statement st, Solution solution) {
Assert(st);
yield return new Solution(solution.State.Copy());
}