/// <summary>
/// Executes the given program.
/// </summary>
/// <param name="program">Program to execute.</param>
/// <returns>Returns a variable that contains the result of the program.</returns>
public Variable Execute(CompiledProgram program)
{
if (program == null)
{
throw new ArgumentNullException(nameof(program));
}
if (program.IsEmpty)
{
throw new Exception("Cannot execute empty program");
}
// Populate data
Reader = new ByteCodeReader(program.GetByteCodes());
Functions = program.GetFunctions();
Variables = program.GetVariables();
Literals = program.GetLiterals();
FunctionStack = new Stack <RuntimeFunction>();
VarStack = new Stack <Variable>();
UserData = null;
OnBegin();
// Initial bytecode is call to main() function
ByteCode bytecode = Reader.GetNext();
Debug.Assert(bytecode == ByteCode.ExecFunction);
int mainId = Reader.GetNextValue();
Debug.Assert(Functions[mainId] is UserFunction);
RuntimeFunction function = new RuntimeFunction(Functions[mainId] as UserFunction);
try
{
// Execute this function
ExecuteFunction(function);
}
catch (Exception ex)
{
// Include line-number information if possible
if (program.LineNumbers != null)
{
Debug.Assert(program.LineNumbers.Length == program.ByteCodes.Length);
int ip = (Reader.IP - 1);
if (ip >= 0 && ip < program.LineNumbers.Length)
{
string s = $"\"{ex.Message}\" exception on line {program.LineNumbers[ip]}. See inner exception for details.";
throw new Exception(s, ex);
}
}
throw;
}
finally
{
OnEnd();
}
// Return result
return(function.ReturnValue);
}
public void Reset(CompiledProgram program)
{
Program = program ?? throw new ArgumentNullException(nameof(program));
Reader = new ByteCodeReader(Program.GetByteCodes());
FunctionStack = new Stack <RuntimeFunction>();
VarStack = new Stack <Variable>();
UserData = null;
}
