// returns a map from integer id to an atomic Boogie predicate
public static Dictionary <int, BoogieExpr> GenerateHoudiniVarMapping(ContractDefinition contract, TranslatorContext context)
{
Dictionary <int, BoogieExpr> ret = new Dictionary <int, BoogieExpr>();
HashSet <VariableDeclaration> stateVars = context.GetVisibleStateVarsByContract(contract);
// collect all state variables of type address
List <VariableDeclaration> addressVariables = new List <VariableDeclaration>();
foreach (VariableDeclaration stateVar in stateVars)
{
if (stateVar.TypeName is ElementaryTypeName elementaryType)
{
if (elementaryType.TypeDescriptions.TypeString.Equals("address") ||
elementaryType.TypeDescriptions.TypeString.Equals("address payable"))
{
addressVariables.Add(stateVar);
}
}
}
int id = 0;
// equaility and disequality to null
foreach (VariableDeclaration addressVar in addressVariables)
{
BoogieExpr lhs = GetBoogieExprOfStateVar(addressVar, context);
BoogieExpr rhs = new BoogieIdentifierExpr("null");
BoogieExpr equality = new BoogieBinaryOperation(BoogieBinaryOperation.Opcode.EQ, lhs, rhs);
ret[++id] = equality;
BoogieExpr disequality = new BoogieBinaryOperation(BoogieBinaryOperation.Opcode.NEQ, lhs, rhs);
ret[++id] = disequality;
}
// pair-wise equality and disequality
for (int i = 0; i < addressVariables.Count; ++i)
{
BoogieExpr lhs = GetBoogieExprOfStateVar(addressVariables[i], context);
for (int j = i + 1; j < addressVariables.Count; ++j)
{
BoogieExpr rhs = GetBoogieExprOfStateVar(addressVariables[j], context);
BoogieExpr equality = new BoogieBinaryOperation(BoogieBinaryOperation.Opcode.EQ, lhs, rhs);
ret[++id] = equality;
BoogieExpr disequality = new BoogieBinaryOperation(BoogieBinaryOperation.Opcode.NEQ, lhs, rhs);
ret[++id] = disequality;
}
}
// PrintHoudiniCandidateMap(ret);
return(ret);
}