private BytecodeToken ReadNextInternal()
{
int readerpos = (int)_reader.BaseStream.Position;
ME1OpCodes b = (ME1OpCodes)_reader.ReadByte();
switch (b)
{
case ME1OpCodes.EX_LocalVariable:
case ME1OpCodes.EX_InstanceVariable:
case ME1OpCodes.EX_NativeParm:
return(ReadRef(r => r.ObjectName));
case ME1OpCodes.EX_DefaultVariable:
return(ReadRef(r => "Default." + r.ObjectName));
case ME1OpCodes.EX_Return:
{
BytecodeToken returnValue = ReadNext();
return(new ReturnToken(returnValue, readerpos));
}
case ME1OpCodes.EX_Assert:
{
_reader.ReadInt16();
_reader.ReadByte();
return(WrapNextBytecode(c => new BytecodeToken("assert(" + c + ")", readerpos)));
}
case ME1OpCodes.EX_Switch:
{
byte b1 = _reader.ReadByte();
BytecodeToken switchExpr = ReadNext();
return(new SwitchToken(switchExpr.ToString(), switchExpr, readerpos));
}
case ME1OpCodes.EX_Case:
{
short offset = _reader.ReadInt16();
if (offset == -1)
{
return(new DefaultToken(readerpos));
}
BytecodeToken caseExpr = ReadNext();
return(new CaseToken(caseExpr.ToString(), readerpos));
}
case ME1OpCodes.EX_Jump:
{
int offset = _reader.ReadInt16();
return(new UncondJumpToken(offset, readerpos));
}
case ME1OpCodes.EX_JumpIfNot:
{
short offset = _reader.ReadInt16();
BytecodeToken condition = ReadNext();
if (IsInvalid(condition))
{
return(WrapErrToken("if (!" + condition, condition));
}
return(new JumpIfNotToken(offset, condition, readerpos));
}
case ME1OpCodes.EX_LabelTable:
{
var token = new LabelTableToken(readerpos);
while (true)
{
string labelName = ReadName();
if (labelName == "None")
{
break;
}
int offset = _reader.ReadInt32();
token.AddLabel(labelName, offset);
}
return(token);
}
case ME1OpCodes.EX_GotoLabel:
return(WrapNextBytecode(op => Token("goto " + op, readerpos)));
case ME1OpCodes.EX_Self:
return(Token("self", readerpos));
case ME1OpCodes.EX_Skip:
_reader.ReadInt16();
//Returning readnext causes a new token to be read
return(ReadNext());
case ME1OpCodes.EX_EatReturnValue:
_reader.ReadInt32();
return(ReadNext());
case ME1OpCodes.EX_Nothing:
return(new NothingToken(readerpos));
case ME1OpCodes.EX_Stop:
_reader.ReadInt16();
return(new NothingToken(readerpos));
case ME1OpCodes.EX_IntZero:
return(Token("0", readerpos));
case ME1OpCodes.EX_IntOne:
return(Token("1", readerpos));
case ME1OpCodes.EX_True:
return(Token("true", readerpos));
case ME1OpCodes.EX_False:
return(Token("false", readerpos));
case ME1OpCodes.EX_NoObject:
case ME1OpCodes.EX_EmptyDelegate:
return(Token("None", readerpos));
case ME1OpCodes.EX_Let:
case ME1OpCodes.EX_LetBool:
case ME1OpCodes.EX_LetDelegate:
BytecodeToken lhs = ReadNext();
if (IsInvalid(lhs))
{
return(lhs);
}
BytecodeToken rhs = ReadNext();
if (IsInvalid(rhs))
{
return(WrapErrToken(lhs + " = " + rhs, rhs));
}
return(Token(lhs + " = " + rhs, readerpos));
case ME1OpCodes.EX_IntConst:
return(Token(_reader.ReadInt32().ToString(), readerpos));
case ME1OpCodes.EX_FloatConst:
return(Token(_reader.ReadSingle().ToString(), readerpos));
case ME1OpCodes.EX_StringConst:
{
var s = ReadAsciiz().Replace("\n", "\\n").Replace("\t", "\\t");
return(Token("\"" + s + "\"", readerpos));
}
case ME1OpCodes.EX_ByteConst:
case ME1OpCodes.EX_IntConstByte:
return(Token(_reader.ReadByte().ToString(), readerpos));
case ME1OpCodes.EX_ObjectConst:
{
int objectIndex = _reader.ReadInt32();
var item = _package.getEntry(objectIndex);
if (item == null)
{
return(ErrToken("Unresolved class item " + objectIndex));
}
return(Token(item.ClassName + "'" + item.ObjectName + "'", readerpos));
}
case ME1OpCodes.EX_NameConst:
return(Token("'" + _package.getNameEntry((int)_reader.ReadInt64()) + "'", readerpos));
case ME1OpCodes.EX_EndFunctionParms:
return(new EndParmsToken(")", readerpos));
case ME1OpCodes.EX_ClassContext:
case ME1OpCodes.EX_Context:
{
var context = ReadNext();
if (IsInvalid(context))
{
return(context);
}
int exprSize = _reader.ReadInt16();
int bSize = _reader.ReadByte();
var value = ReadNext();
if (IsInvalid(value))
{
return(WrapErrToken(context + "." + value, value));
}
return(Token(context + "." + value, readerpos));
}
case ME1OpCodes.EX_InterfaceContext:
return(ReadNext());
case ME1OpCodes.EX_FinalFunction:
{
int functionIndex = _reader.ReadInt32();
var item = _package.getEntry(functionIndex);
if (item == null)
{
return(ErrToken("Unresolved function item " + item));
}
string functionName = item.ObjectName;
return(ReadCall(functionName));
}
case ME1OpCodes.EX_PrimitiveCast:
{
var prefix = _reader.ReadByte();
var v = ReadNext();
return(v);
}
case ME1OpCodes.EX_VirtualFunction:
return(ReadCall(ReadName()));
case ME1OpCodes.EX_GlobalFunction:
return(ReadCall("Global." + ReadName()));
case ME1OpCodes.EX_BoolVariable:
return(ReadNext());
case ME1OpCodes.EX_ByteToInt:
int objectRefIdx = _reader.ReadInt32();
if (_package.isEntry(objectRefIdx))
{
return(Token($"ByteToInt({_package.getObjectName(objectRefIdx)})", readerpos));
}
else
{
return(Token($"ByteToInt(Unknown reference {objectRefIdx})", readerpos));
}
case ME1OpCodes.EX_DynamicCast:
{
int typeIndex = _reader.ReadInt32();
var item = _package.getEntry(typeIndex);
return(WrapNextBytecode(op => Token(item.ObjectName + "(" + op + ")", readerpos)));
}
case ME1OpCodes.EX_Metacast:
{
int typeIndex = _reader.ReadInt32();
var item = _package.getEntry(typeIndex);
if (item == null)
{
return(ErrToken("Unresolved class item " + typeIndex));
}
return(WrapNextBytecode(op => Token("Class<" + item.ObjectName + ">(" + op + ")", readerpos)));
}
case ME1OpCodes.EX_StructMember:
{
var field = ReadRef();
var structType = ReadRef();
int wSkip = _reader.ReadInt16();
var token = ReadNext();
if (IsInvalid(token))
{
return(token);
}
return(Token(token + "." + field.ObjectName, readerpos));
}
case ME1OpCodes.EX_ArrayElement:
case ME1OpCodes.EX_DynArrayElement:
{
var index = ReadNext();
if (IsInvalid(index))
{
return(index);
}
var array = ReadNext();
if (IsInvalid(array))
{
return(array);
}
return(Token(array + "[" + index + "]", readerpos));
}
case ME1OpCodes.EX_DynArrayLength:
return(WrapNextBytecode(op => Token(op + ".Length", readerpos)));
case ME1OpCodes.EX_StructCmpEq:
return(CompareStructs("=="));
case ME1OpCodes.EX_StructCmpNe:
return(CompareStructs("!="));
case ME1OpCodes.EX_EndOfScript:
return(new EndOfScriptToken(readerpos));
case ME1OpCodes.EX_EmptyParmValue:
case ME1OpCodes.EX_GoW_DefaultValue:
return(new DefaultValueToken("", readerpos));
case ME1OpCodes.EX_DefaultParmValue:
{
var size = _reader.ReadInt16();
var offset = _reader.BaseStream.Position;
var defaultValueExpr = ReadNext();
_reader.BaseStream.Position = offset + size;
return(new DefaultParamValueToken(defaultValueExpr.ToString(), readerpos));
}
case ME1OpCodes.EX_LocalOutVariable:
int valueIndex = _reader.ReadInt32();
var packageItem = _package.getEntry(valueIndex);
if (packageItem == null)
{
return(ErrToken("Unresolved package item " + packageItem));
}
return(Token(packageItem.ObjectName, readerpos));
case ME1OpCodes.EX_Iterator:
var expr = ReadNext();
int loopEnd = _reader.ReadInt16();
if (IsInvalid(expr))
{
return(WrapErrToken("foreach " + expr, expr));
}
return(new ForeachToken(loopEnd, expr, readerpos));
case ME1OpCodes.EX_IteratorPop:
return(new IteratorPopToken(readerpos));
case ME1OpCodes.EX_IteratorNext:
return(new IteratorNextToken(readerpos));
case ME1OpCodes.EX_New:
var outer = ReadNext();
if (IsInvalid(outer))
{
return(outer);
}
var name = ReadNext();
if (IsInvalid(name))
{
return(name);
}
var flags = ReadNext();
if (IsInvalid(flags))
{
return(flags);
}
var cls = ReadNext();
if (IsInvalid(cls))
{
return(cls);
}
return(Token("new(" + JoinTokens(outer, name, flags, cls) + ")", readerpos));
case ME1OpCodes.EX_VectorConst:
var f1 = _reader.ReadSingle();
var f2 = _reader.ReadSingle();
var f3 = _reader.ReadSingle();
return(Token("vect(" + f1 + "," + f2 + "," + f3 + ")", readerpos));
case ME1OpCodes.EX_RotationConst:
var i1 = _reader.ReadInt32();
var i2 = _reader.ReadInt32();
var i3 = _reader.ReadInt32();
return(Token("rot(" + i1 + "," + i2 + "," + i3 + ")", readerpos));
case ME1OpCodes.EX_InterfaceCast:
{
var interfaceName = ReadRef();
return(WrapNextBytecode(op => Token(interfaceName.ObjectName + "(" + op + ")", readerpos)));
}
case ME1OpCodes.EX_Conditional:
{
var condition = ReadNext();
if (IsInvalid(condition))
{
return(condition);
}
var trueSize = _reader.ReadInt16();
var pos = _reader.BaseStream.Position;
var truePart = ReadNext();
if (IsInvalid(truePart))
{
return(WrapErrToken(condition + " ? " + truePart, truePart));
}
if (_reader.BaseStream.Position != pos + trueSize)
{
return(ErrToken("conditional true part size mismatch"));
}
var falseSize = _reader.ReadInt16();
pos = _reader.BaseStream.Position;
var falsePart = ReadNext();
if (IsInvalid(truePart))
{
return(WrapErrToken(condition + " ? " + truePart + " : " + falsePart, falsePart));
}
Debug.Assert(_reader.BaseStream.Position == pos + falseSize);
return(Token(condition + " ? " + truePart + " : " + falsePart, readerpos));
}
case ME1OpCodes.EX_DynArrayFind:
return(ReadDynArray1ArgMethod("Find"));
case ME1OpCodes.EX_DynArrayFindStruct:
return(ReadDynArray2ArgMethod("Find", true));
case ME1OpCodes.EX_DynArrayRemove:
return(ReadDynArray2ArgMethod("Remove", false));
case ME1OpCodes.EX_DynArrayInsert:
return(ReadDynArray2ArgMethod("Insert", false));
case ME1OpCodes.EX_DynArrayAddItem:
return(ReadDynArray1ArgMethod("AddItem"));
case ME1OpCodes.EX_DynArrayRemoveItem:
return(ReadDynArray1ArgMethod("RemoveItem"));
case ME1OpCodes.EX_DynArrayInsertItem:
return(ReadDynArray2ArgMethod("InsertItem", true));
case ME1OpCodes.EX_DynArrayIterator:
{
var array = ReadNext();
if (IsInvalid(array))
{
return(array);
}
var iteratorVar = ReadNext();
if (IsInvalid(iteratorVar))
{
return(iteratorVar);
}
_reader.ReadInt16();
var endOffset = _reader.ReadInt16();
return(new ForeachToken(endOffset, array, iteratorVar, readerpos));
}
case ME1OpCodes.EX_DelegateProperty:
case ME1OpCodes.EX_InstanceDelegate:
return(Token(ReadName(), readerpos));
case ME1OpCodes.EX_DelegateFunction:
{
var receiver = ReadNext();
if (IsInvalid(receiver))
{
return(receiver);
}
var methodName = ReadName();
if (receiver.ToString().StartsWith("__") && receiver.ToString().EndsWith("__Delegate"))
{
return(ReadCall(methodName));
}
return(ReadCall(receiver + "." + methodName));
}
case ME1OpCodes.EX_EqualEqual_DelDel:
case ME1OpCodes.EX_EqualEqual_DelFunc:
return(CompareDelegates("=="));
case ME1OpCodes.EX_NotEqual_DelDel:
return(CompareDelegates("!="));
default:
if ((int)b >= 0x60)
{
return(ReadNativeCall((byte)b));
}
return(ErrToken("// unknown bytecode " + ((byte)b).ToString("X2"), (int)b));
}
}
