/// <summary>
/// generate a non-deterministic choice block to call every public visible functions except constructors
///
/// </summary>
/// <param name="contracts"></param>
/// <param name="context"></param>
/// <param name="callBackTarget">If non-null, this will be the msg.sender for calling back into the contracts</param>
/// <returns></returns>
public static BoogieIfCmd GenerateChoiceBlock(List <ContractDefinition> contracts, AST_Handler context, Tuple <string, string> callBackTarget = null)
{
BoogieIfCmd ifCmd = null;
int j = 0;
foreach (var contract in contracts)
{
if (contract.ContractKind != EnumContractKind.CONTRACT)
{
continue;
}
HashSet <FunctionDefinition> funcDefs = context.RetrieveVisibleFunctions(contract);
List <FunctionDefinition> publicFuncDefs = new List <FunctionDefinition>();
foreach (FunctionDefinition funcDef in funcDefs)
{
if (funcDef.ofConstructorType)
{
continue;
}
if (funcDef.ofFallBackType)
{
continue; //let us not call fallback directly in harness
}
if (funcDef.Visibility == EnumVisibility.PUBLIC || funcDef.Visibility == EnumVisibility.EXTERNAL)
{
publicFuncDefs.Add(funcDef);
}
}
for (int i = publicFuncDefs.Count - 1; i >= 0; --i)
{
j++;
BoogieExpr guard = new BoogieBinaryOperation(BoogieBinaryOperation.Opcode.EQ,
new BoogieIdentifierExpr("choice"),
new BoogieLiteralExpr(j));
BoogieStmtList thenBody = new BoogieStmtList();
FunctionDefinition funcDef = publicFuncDefs[i];
string callee = Conversion_Utility_Tool.GetCanonicalFunctionName(funcDef, context);
List <BoogieExpr> inputs = new List <BoogieExpr>()
{
// let us just call back into the calling contract
callBackTarget != null ? new BoogieIdentifierExpr(callBackTarget.Item1) : new BoogieIdentifierExpr("this"),
callBackTarget != null ? new BoogieIdentifierExpr(callBackTarget.Item2) : new BoogieIdentifierExpr("msgsender_MSG"),
new BoogieIdentifierExpr("msgvalue_MSG"),
};
var inpParamCount = 0;
foreach (VariableDeclaration param in funcDef.Parameters.Parameters)
{
string name = $"__arg_{inpParamCount++}_" + funcDef.Name;
if (!string.IsNullOrEmpty(param.Name))
{
name = Conversion_Utility_Tool.GetCanonicalLocalVariableName(param, context);
}
inputs.Add(new BoogieIdentifierExpr(name));
if (param.TypeName is ArrayTypeName array)
{
thenBody.AddStatement(new BoogieCallCmd(
"FreshRefGenerator",
new List <BoogieExpr>(), new List <BoogieIdentifierExpr>()
{
new BoogieIdentifierExpr(name)
}));
}
}
List <BoogieIdentifierExpr> outputs = new List <BoogieIdentifierExpr>();
var retParamCount = 0;
foreach (VariableDeclaration param in funcDef.ReturnParameters.Parameters)
{
string name = $"__ret_{retParamCount++}_" + funcDef.Name;
if (!string.IsNullOrEmpty(param.Name))
{
name = Conversion_Utility_Tool.GetCanonicalLocalVariableName(param, context);
}
outputs.Add(new BoogieIdentifierExpr(name));
}
if (Flags_HelperClass.InstrumentGas)
{
havocGas(thenBody);
}
BoogieCallCmd callCmd = new BoogieCallCmd(callee, inputs, outputs);
thenBody.AddStatement(callCmd);
BoogieStmtList elseBody = ifCmd == null ? null : BoogieStmtList.MakeSingletonStmtList(ifCmd);
ifCmd = new BoogieIfCmd(guard, thenBody, elseBody);
}
}
return(ifCmd);
}