Processing Label Declarations

Processing Label declarations is trivial. They are simply stored into symbol table as identifiers.

Procedure ProcessLabelDeclarations;
Var Id: PIdentifier;
    AddData: Pointer;
begin
  GetNextToken;
  Repeat
    CheckForNumericLabel;
    Id := ExpectAndStoreIdentifier (2, AddData);
    Id^.Token := Token_LabelIdentifier;
  until not CheckAndGetNextToken (Token_Comma);
  ExpectTokenAndGetNext (TOKEN_Semicolon);
end;

This procedure reads numeric label, checks limits and converts it to string identifier with hash value.

Procedure CheckForNumericLabel;
Var N: Byte;
begin
  If Token <> Token_Constant then Exit;
  If ConstantTypeDefRec.Ofs <> LongInt_TypeOffset then Exit;
  If NumericConstant.LongRec.WordH <> 0 then Exit;
  If NumericConstant.LongRec.WordL > 9999 then Exit;
  Str (NumericConstant.LongRec.WordL: 4, CurrentIdentifier);
  ShortInt (CurrentIdentifierHash) :=  - 4;
  For N := 1 to 4 do
    begin
      If CurrentIdentifier [N] = ' ' then CurrentIdentifier [N] := '0';
      Inc (CurrentIdentifierHash, Byte (CurrentIdentifier [N]) and $DF);
    end;
  CurrentIdentifierHash := CurrentIdentifierHash shl 1;
  Token := Token_Identifier;
end;