protected StatementList ReadBytecode(out BytecodeReader bcReader)
{
var s = new MemoryStream(_bytecode);
var reader = new EndianReader(s)
{
Endian = _self.FileRef.Endian
};
bcReader = new BytecodeReader(_self.FileRef, reader);
var statements = new StatementList((Statement)null);
bool keepParsing = true;
while (s.Position < s.Length && keepParsing)
{
int startOffset = (int)s.Position;
//Debug.WriteLine("Reading token at 0x" + startOffset.ToString("X4"));
BytecodeToken bc;
try
{
bc = bcReader.ReadNext();
}
catch (Exception)
{
//extra bytes at the end can trigger this. They are not used. may be something like byte aligning or something
break;
}
if (bc == null /*|| bc is EndOfScriptToken*/)
{
break;
}
statements.Add(new Statement(startOffset, (int)s.Position, bc, bcReader));
if (bc is ErrorBytecodeToken errorToken)
{
int bytecode = errorToken.UnknownBytecode;
if (bytecode >= 0)
{
ProblemRegistry.RegisterUnknownBytecode((byte)bytecode, this, errorToken.SubsequentBytes);
}
else
{
ProblemRegistry.RegisterBytecodeError(this, errorToken.ToString());
}
break;
}
if (/*bc is LabelTableToken || /*bc is StopToken ||*/ bc is EndOfScriptToken)
{
keepParsing = false;
break; //Nothing else to parse is bytecode
}
}
return(statements);
}
public void DecompileBytecode(StatementList statements, TextBuilder result, bool createControlStatements)
{
var labelTableStatement = statements.Find(s => s.Token is LabelTableToken);
var labelTable = (LabelTableToken)labelTableStatement?.Token;
result.HasErrors = statements.HasErrors();
if (createControlStatements)
{
try
{
statements.CreateControlStatements();
}
catch (Exception)
{
ProblemRegistry.RegisterIncompleteControlFlow(this);
}
if (statements.IsIncompleteControlFlow())
{
ProblemRegistry.RegisterIncompleteControlFlow(this);
}
statements.RemoveRedundantReturns();
}
statements.Print(result, labelTable, !createControlStatements);
}
